linux/generic: refresh 2.6.36 kernel patches

[openwrt/svn-archive/archive.git] / target / linux / generic / patches-2.6.36 / 511-yaffs-git-2010-10-01.patch

--- a/fs/yaffs2/devextras.h
+++ b/fs/yaffs2/devextras.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -24,6 +24,8 @@
 #define __EXTRAS_H__
 
 
+#include "yportenv.h"
+
 #if !(defined __KERNEL__)
 
 /* Definition of types */
@@ -33,103 +35,6 @@ typedef unsigned __u32;
 
 #endif
 
-/*
- * This is a simple doubly linked list implementation that matches the
- * way the Linux kernel doubly linked list implementation works.
- */
-
-struct ylist_head {
-       struct ylist_head *next; /* next in chain */
-       struct ylist_head *prev; /* previous in chain */
-};
-
-
-/* Initialise a static list */
-#define YLIST_HEAD(name) \
-struct ylist_head name = { &(name), &(name)}
-
-
-
-/* Initialise a list head to an empty list */
-#define YINIT_LIST_HEAD(p) \
-do { \
-       (p)->next = (p);\
-       (p)->prev = (p); \
-} while (0)
-
-
-/* Add an element to a list */
-static __inline__ void ylist_add(struct ylist_head *newEntry,
-                               struct ylist_head *list)
-{
-       struct ylist_head *listNext = list->next;
-
-       list->next = newEntry;
-       newEntry->prev = list;
-       newEntry->next = listNext;
-       listNext->prev = newEntry;
-
-}
-
-static __inline__ void ylist_add_tail(struct ylist_head *newEntry,
-                                struct ylist_head *list)
-{
-       struct ylist_head *listPrev = list->prev;
-
-       list->prev = newEntry;
-       newEntry->next = list;
-       newEntry->prev = listPrev;
-       listPrev->next = newEntry;
-
-}
-
-
-/* Take an element out of its current list, with or without
- * reinitialising the links.of the entry*/
-static __inline__ void ylist_del(struct ylist_head *entry)
-{
-       struct ylist_head *listNext = entry->next;
-       struct ylist_head *listPrev = entry->prev;
-
-       listNext->prev = listPrev;
-       listPrev->next = listNext;
-
-}
-
-static __inline__ void ylist_del_init(struct ylist_head *entry)
-{
-       ylist_del(entry);
-       entry->next = entry->prev = entry;
-}
-
-
-/* Test if the list is empty */
-static __inline__ int ylist_empty(struct ylist_head *entry)
-{
-       return (entry->next == entry);
-}
-
-
-/* ylist_entry takes a pointer to a list entry and offsets it to that
- * we can find a pointer to the object it is embedded in.
- */
-
-
-#define ylist_entry(entry, type, member) \
-       ((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
-
-
-/* ylist_for_each and list_for_each_safe  iterate over lists.
- * ylist_for_each_safe uses temporary storage to make the list delete safe
- */
-
-#define ylist_for_each(itervar, list) \
-       for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
-
-#define ylist_for_each_safe(itervar, saveVar, list) \
-       for (itervar = (list)->next, saveVar = (list)->next->next; \
-               itervar != (list); itervar = saveVar, saveVar = saveVar->next)
-
 
 #if !(defined __KERNEL__)
 
--- a/fs/yaffs2/Kconfig
+++ b/fs/yaffs2/Kconfig
@@ -90,23 +90,15 @@ config YAFFS_AUTO_YAFFS2
 
          If unsure, say Y.
 
-config YAFFS_DISABLE_LAZY_LOAD
-       bool "Disable lazy loading"
-       depends on YAFFS_YAFFS2
+config YAFFS_DISABLE_TAGS_ECC
+       bool "Disable YAFFS from doing ECC on tags by default"
+       depends on YAFFS_FS && YAFFS_YAFFS2
        default n
        help
-         "Lazy loading" defers loading file details until they are
-         required. This saves mount time, but makes the first look-up
-         a bit longer.
-
-         Lazy loading will only happen if enabled by this option being 'n'
-         and if the appropriate tags are available, else yaffs2 will
-         automatically fall back to immediate loading and do the right
-         thing.
-
-         Lazy laoding will be required by checkpointing.
-
-         Setting this to 'y' will disable lazy loading.
+         This defaults Yaffs to using its own ECC calculations on tags instead of
+         just relying on the MTD.
+         This behavior can also be overridden with tags_ecc_on and
+         tags_ecc_off mount options.
 
          If unsure, say N.
 
@@ -154,3 +146,45 @@ config YAFFS_SHORT_NAMES_IN_RAM
          but makes look-ups faster.
 
          If unsure, say Y.
+
+config YAFFS_EMPTY_LOST_AND_FOUND
+       bool "Empty lost and found on boot"
+       depends on YAFFS_FS
+       default n
+       help
+         If this is enabled then the contents of lost and found is
+         automatically dumped at mount.
+
+         If unsure, say N.
+
+config YAFFS_DISABLE_BLOCK_REFRESHING
+       bool "Disable yaffs2 block refreshing"
+       depends on YAFFS_FS
+       default n
+       help
+        If this is set, then block refreshing is disabled.
+        Block refreshing infrequently refreshes the oldest block in
+        a yaffs2 file system. This mechanism helps to refresh flash to
+        mitigate against data loss. This is particularly useful for MLC.
+
+         If unsure, say N.
+
+config YAFFS_DISABLE_BACKGROUND
+       bool "Disable yaffs2 background processing"
+       depends on YAFFS_FS
+       default n
+       help
+        If this is set, then background processing is disabled.
+        Background processing makes many foreground activities faster.
+
+         If unsure, say N.
+
+config YAFFS_XATTR
+       bool "Enable yaffs2 xattr support"
+       depends on YAFFS_FS
+       default y
+       help
+        If this is set then yaffs2 will provide xattr support.
+        If unsure, say Y.
+
+
--- a/fs/yaffs2/Makefile
+++ b/fs/yaffs2/Makefile
@@ -4,7 +4,14 @@
 
 obj-$(CONFIG_YAFFS_FS) += yaffs.o
 
-yaffs-y := yaffs_ecc.o yaffs_fs.o yaffs_guts.o yaffs_checkptrw.o
-yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o yaffs_qsort.o
+yaffs-y := yaffs_ecc.o yaffs_vfs_glue.o yaffs_guts.o yaffs_checkptrw.o
+yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
 yaffs-y += yaffs_tagscompat.o yaffs_tagsvalidity.o
 yaffs-y += yaffs_mtdif.o yaffs_mtdif1.o yaffs_mtdif2.o
+yaffs-y += yaffs_nameval.o
+yaffs-y += yaffs_allocator.o
+yaffs-y += yaffs_yaffs1.o
+yaffs-y += yaffs_yaffs2.o
+yaffs-y += yaffs_bitmap.o
+yaffs-y += yaffs_verify.o
+
--- a/fs/yaffs2/moduleconfig.h
+++ b/fs/yaffs2/moduleconfig.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Martin Fouts <Martin.Fouts@palmsource.com>
@@ -29,22 +29,43 @@
 /* Meaning: Yaffs does its own ECC, rather than using MTD ECC */
 /* #define CONFIG_YAFFS_DOES_ECC */
 
+/* Default: Selected */
+/* Meaning: Yaffs does its own ECC on tags for packed tags rather than use mtd */
+#define CONFIG_YAFFS_DOES_TAGS_ECC
+
 /* Default: Not selected */
 /* Meaning: ECC byte order is 'wrong'.  Only meaningful if */
 /*          CONFIG_YAFFS_DOES_ECC is set */
 /* #define CONFIG_YAFFS_ECC_WRONG_ORDER */
 
-/* Default: Selected */
-/* Meaning: Disables testing whether chunks are erased before writing to them*/
-#define CONFIG_YAFFS_DISABLE_CHUNK_ERASED_CHECK
+/* Default: Not selected */
+/* Meaning: Always test whether chunks are erased before writing to them.
+           Use during mtd debugging and init. */
+/* #define CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED */
+
+/* Default: Not Selected */
+/* Meaning: At mount automatically empty all files from lost and found. */
+/* This is done to fix an old problem where rmdir was not checking for an */
+/* empty directory. This can also be achieved with a mount option. */
+#define CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
 
 /* Default: Selected */
 /* Meaning: Cache short names, taking more RAM, but faster look-ups */
 #define CONFIG_YAFFS_SHORT_NAMES_IN_RAM
 
-/* Default: 10 */
-/* Meaning: set the count of blocks to reserve for checkpointing */
-#define CONFIG_YAFFS_CHECKPOINT_RESERVED_BLOCKS 10
+/* Default: Unselected */
+/* Meaning: Select to disable block refreshing. */
+/* Block Refreshing periodically rewrites the oldest block. */
+/* #define CONFIG_DISABLE_BLOCK_REFRESHING */
+
+/* Default: Unselected */
+/* Meaning: Select to disable background processing */
+/* #define CONFIG_DISABLE_BACKGROUND */
+
+
+/* Default: Selected */
+/* Meaning: Enable XATTR support */
+#define CONFIG_YAFFS_XATTR
 
 /*
 Older-style on-NAND data format has a "pageStatus" byte to record
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.c
@@ -0,0 +1,409 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+
+#ifdef CONFIG_YAFFS_YMALLOC_ALLOCATOR
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+       dev = dev;
+}
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+       dev = dev;
+}
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+       return (yaffs_Tnode *)YMALLOC(dev->tnodeSize);
+}
+
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+       dev = dev;
+       YFREE(tn);
+}
+
+void yaffs_InitialiseRawObjects(yaffs_Device *dev)
+{
+       dev = dev;
+}
+
+void yaffs_DeinitialiseRawObjects(yaffs_Device *dev)
+{
+       dev = dev;
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+       dev = dev;
+       return (yaffs_Object *) YMALLOC(sizeof(yaffs_Object));
+}
+
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+
+       dev = dev;
+       YFREE(obj);
+}
+
+#else
+
+struct yaffs_TnodeList_struct {
+       struct yaffs_TnodeList_struct *next;
+       yaffs_Tnode *tnodes;
+};
+
+typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
+
+struct yaffs_ObjectList_struct {
+       yaffs_Object *objects;
+       struct yaffs_ObjectList_struct *next;
+};
+
+typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
+
+
+struct yaffs_AllocatorStruct {
+       int nTnodesCreated;
+       yaffs_Tnode *freeTnodes;
+       int nFreeTnodes;
+       yaffs_TnodeList *allocatedTnodeList;
+
+       int nObjectsCreated;
+       yaffs_Object *freeObjects;
+       int nFreeObjects;
+
+       yaffs_ObjectList *allocatedObjectList;
+};
+
+typedef struct yaffs_AllocatorStruct yaffs_Allocator;
+
+
+static void yaffs_DeinitialiseRawTnodes(yaffs_Device *dev)
+{
+
+       yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+
+       yaffs_TnodeList *tmp;
+
+       if(!allocator){
+               YBUG();
+               return;
+       }
+
+       while (allocator->allocatedTnodeList) {
+               tmp = allocator->allocatedTnodeList->next;
+
+               YFREE(allocator->allocatedTnodeList->tnodes);
+               YFREE(allocator->allocatedTnodeList);
+               allocator->allocatedTnodeList = tmp;
+
+       }
+
+       allocator->freeTnodes = NULL;
+       allocator->nFreeTnodes = 0;
+       allocator->nTnodesCreated = 0;
+}
+
+static void yaffs_InitialiseRawTnodes(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+
+       if(allocator){
+               allocator->allocatedTnodeList = NULL;
+               allocator->freeTnodes = NULL;
+               allocator->nFreeTnodes = 0;
+               allocator->nTnodesCreated = 0;
+       } else
+               YBUG();
+}
+
+static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
+{
+       yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+       int i;
+       yaffs_Tnode *newTnodes;
+       __u8 *mem;
+       yaffs_Tnode *curr;
+       yaffs_Tnode *next;
+       yaffs_TnodeList *tnl;
+
+       if(!allocator){
+               YBUG();
+               return YAFFS_FAIL;
+       }
+
+       if (nTnodes < 1)
+               return YAFFS_OK;
+
+
+       /* make these things */
+
+       newTnodes = YMALLOC(nTnodes * dev->tnodeSize);
+       mem = (__u8 *)newTnodes;
+
+       if (!newTnodes) {
+               T(YAFFS_TRACE_ERROR,
+                       (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
+               return YAFFS_FAIL;
+       }
+
+       /* New hookup for wide tnodes */
+       for (i = 0; i < nTnodes - 1; i++) {
+               curr = (yaffs_Tnode *) &mem[i * dev->tnodeSize];
+               next = (yaffs_Tnode *) &mem[(i+1) * dev->tnodeSize];
+               curr->internal[0] = next;
+       }
+
+       curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * dev->tnodeSize];
+       curr->internal[0] = allocator->freeTnodes;
+       allocator->freeTnodes = (yaffs_Tnode *)mem;
+
+       allocator->nFreeTnodes += nTnodes;
+       allocator->nTnodesCreated += nTnodes;
+
+       /* Now add this bunch of tnodes to a list for freeing up.
+        * NB If we can't add this to the management list it isn't fatal
+        * but it just means we can't free this bunch of tnodes later.
+        */
+
+       tnl = YMALLOC(sizeof(yaffs_TnodeList));
+       if (!tnl) {
+               T(YAFFS_TRACE_ERROR,
+                 (TSTR
+                  ("yaffs: Could not add tnodes to management list" TENDSTR)));
+                  return YAFFS_FAIL;
+       } else {
+               tnl->tnodes = newTnodes;
+               tnl->next = allocator->allocatedTnodeList;
+               allocator->allocatedTnodeList = tnl;
+       }
+
+       T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
+
+       return YAFFS_OK;
+}
+
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+       yaffs_Tnode *tn = NULL;
+
+       if(!allocator){
+               YBUG();
+               return NULL;
+       }
+
+       /* If there are none left make more */
+       if (!allocator->freeTnodes)
+               yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
+
+       if (allocator->freeTnodes) {
+               tn = allocator->freeTnodes;
+               allocator->freeTnodes = allocator->freeTnodes->internal[0];
+               allocator->nFreeTnodes--;
+       }
+
+       return tn;
+}
+
+/* FreeTnode frees up a tnode and puts it back on the free list */
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+
+       if(!allocator){
+               YBUG();
+               return;
+       }
+
+       if (tn) {
+               tn->internal[0] = allocator->freeTnodes;
+               allocator->freeTnodes = tn;
+               allocator->nFreeTnodes++;
+       }
+       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
+
+
+
+static void yaffs_InitialiseRawObjects(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+
+       if(allocator) {
+               allocator->allocatedObjectList = NULL;
+               allocator->freeObjects = NULL;
+               allocator->nFreeObjects = 0;
+       } else
+               YBUG();
+}
+
+static void yaffs_DeinitialiseRawObjects(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+       yaffs_ObjectList *tmp;
+
+       if(!allocator){
+               YBUG();
+               return;
+       }
+
+       while (allocator->allocatedObjectList) {
+               tmp = allocator->allocatedObjectList->next;
+               YFREE(allocator->allocatedObjectList->objects);
+               YFREE(allocator->allocatedObjectList);
+
+               allocator->allocatedObjectList = tmp;
+       }
+
+       allocator->freeObjects = NULL;
+       allocator->nFreeObjects = 0;
+       allocator->nObjectsCreated = 0;
+}
+
+
+static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+
+       int i;
+       yaffs_Object *newObjects;
+       yaffs_ObjectList *list;
+
+       if(!allocator){
+               YBUG();
+               return YAFFS_FAIL;
+       }
+
+       if (nObjects < 1)
+               return YAFFS_OK;
+
+       /* make these things */
+       newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
+       list = YMALLOC(sizeof(yaffs_ObjectList));
+
+       if (!newObjects || !list) {
+               if (newObjects){
+                       YFREE(newObjects);
+                       newObjects = NULL;
+               }
+               if (list){
+                       YFREE(list);
+                       list = NULL;
+               }
+               T(YAFFS_TRACE_ALLOCATE,
+                 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
+               return YAFFS_FAIL;
+       }
+
+       /* Hook them into the free list */
+       for (i = 0; i < nObjects - 1; i++) {
+               newObjects[i].siblings.next =
+                               (struct ylist_head *)(&newObjects[i + 1]);
+       }
+
+       newObjects[nObjects - 1].siblings.next = (void *)allocator->freeObjects;
+       allocator->freeObjects = newObjects;
+       allocator->nFreeObjects += nObjects;
+       allocator->nObjectsCreated += nObjects;
+
+       /* Now add this bunch of Objects to a list for freeing up. */
+
+       list->objects = newObjects;
+       list->next = allocator->allocatedObjectList;
+       allocator->allocatedObjectList = list;
+
+       return YAFFS_OK;
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+       yaffs_Object *obj = NULL;
+       yaffs_Allocator *allocator = dev->allocator;
+
+       if(!allocator) {
+               YBUG();
+               return obj;
+       }
+
+       /* If there are none left make more */
+       if (!allocator->freeObjects)
+               yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
+
+       if (allocator->freeObjects) {
+               obj = allocator->freeObjects;
+               allocator->freeObjects =
+                       (yaffs_Object *) (allocator->freeObjects->siblings.next);
+               allocator->nFreeObjects--;
+       }
+
+       return obj;
+}
+
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+
+       yaffs_Allocator *allocator = dev->allocator;
+
+       if(!allocator)
+               YBUG();
+       else {
+               /* Link into the free list. */
+               obj->siblings.next = (struct ylist_head *)(allocator->freeObjects);
+               allocator->freeObjects = obj;
+               allocator->nFreeObjects++;
+       }
+}
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+       if(dev->allocator){
+               yaffs_DeinitialiseRawTnodes(dev);
+               yaffs_DeinitialiseRawObjects(dev);
+
+               YFREE(dev->allocator);
+               dev->allocator=NULL;
+       } else
+               YBUG();
+}
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator;
+
+       if(!dev->allocator){
+               allocator = YMALLOC(sizeof(yaffs_Allocator));
+               if(allocator){
+                       dev->allocator = allocator;
+                       yaffs_InitialiseRawTnodes(dev);
+                       yaffs_InitialiseRawObjects(dev);
+               }
+       } else
+               YBUG();
+}
+
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_allocator.h
@@ -0,0 +1,30 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_ALLOCATOR_H__
+#define __YAFFS_ALLOCATOR_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev);
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev);
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev);
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn);
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev);
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj);
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.c
@@ -0,0 +1,105 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#include "yaffs_bitmap.h"
+#include "yaffs_trace.h"
+/*
+ * Chunk bitmap manipulations
+ */
+
+static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
+{
+       if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
+               T(YAFFS_TRACE_ERROR,
+                       (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
+                       blk));
+               YBUG();
+       }
+       return dev->chunkBits +
+               (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
+}
+
+void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
+{
+       if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
+                       chunk < 0 || chunk >= dev->param.nChunksPerBlock) {
+               T(YAFFS_TRACE_ERROR,
+               (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
+                       blk, chunk));
+               YBUG();
+       }
+}
+
+void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
+{
+       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+       memset(blkBits, 0, dev->chunkBitmapStride);
+}
+
+void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
+{
+       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+       yaffs_VerifyChunkBitId(dev, blk, chunk);
+
+       blkBits[chunk / 8] &= ~(1 << (chunk & 7));
+}
+
+void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
+{
+       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+
+       yaffs_VerifyChunkBitId(dev, blk, chunk);
+
+       blkBits[chunk / 8] |= (1 << (chunk & 7));
+}
+
+int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
+{
+       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+       yaffs_VerifyChunkBitId(dev, blk, chunk);
+
+       return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+}
+
+int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
+{
+       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+       int i;
+       for (i = 0; i < dev->chunkBitmapStride; i++) {
+               if (*blkBits)
+                       return 1;
+               blkBits++;
+       }
+       return 0;
+}
+
+int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
+{
+       __u8 *blkBits = yaffs_BlockBits(dev, blk);
+       int i;
+       int n = 0;
+       for (i = 0; i < dev->chunkBitmapStride; i++) {
+               __u8 x = *blkBits;
+               while (x) {
+                       if (x & 1)
+                               n++;
+                       x >>= 1;
+               }
+
+               blkBits++;
+       }
+       return n;
+}
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_bitmap.h
@@ -0,0 +1,31 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * Chunk bitmap manipulations
+ */
+
+#ifndef __YAFFS_BITMAP_H__
+#define __YAFFS_BITMAP_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk);
+void yaffs_ClearChunkBits(yaffs_Device *dev, int blk);
+void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk);
+void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk);
+int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk);
+int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk);
+int yaffs_CountChunkBits(yaffs_Device *dev, int blk);
+
+#endif
--- a/fs/yaffs2/yaffs_checkptrw.c
+++ b/fs/yaffs2/yaffs_checkptrw.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,16 +11,12 @@
  * published by the Free Software Foundation.
  */
 
-const char *yaffs_checkptrw_c_version =
-       "$Id: yaffs_checkptrw.c,v 1.18 2009-03-06 17:20:49 wookey Exp $";
-
-
 #include "yaffs_checkptrw.h"
 #include "yaffs_getblockinfo.h"
 
-static int yaffs_CheckpointSpaceOk(yaffs_Device *dev)
+static int yaffs2_CheckpointSpaceOk(yaffs_Device *dev)
 {
-       int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+       int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
 
        T(YAFFS_TRACE_CHECKPOINT,
                (TSTR("checkpt blocks available = %d" TENDSTR),
@@ -30,11 +26,11 @@ static int yaffs_CheckpointSpaceOk(yaffs
 }
 
 
-static int yaffs_CheckpointErase(yaffs_Device *dev)
+static int yaffs2_CheckpointErase(yaffs_Device *dev)
 {
        int i;
 
-       if (!dev->eraseBlockInNAND)
+       if (!dev->param.eraseBlockInNAND)
                return 0;
        T(YAFFS_TRACE_CHECKPOINT, (TSTR("checking blocks %d to %d"TENDSTR),
                dev->internalStartBlock, dev->internalEndBlock));
@@ -43,12 +39,15 @@ static int yaffs_CheckpointErase(yaffs_D
                yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
                if (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT) {
                        T(YAFFS_TRACE_CHECKPOINT, (TSTR("erasing checkpt block %d"TENDSTR), i));
-                       if (dev->eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
+
+                       dev->nBlockErasures++;
+
+                       if (dev->param.eraseBlockInNAND(dev, i - dev->blockOffset /* realign */)) {
                                bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
                                dev->nErasedBlocks++;
-                               dev->nFreeChunks += dev->nChunksPerBlock;
+                               dev->nFreeChunks += dev->param.nChunksPerBlock;
                        } else {
-                               dev->markNANDBlockBad(dev, i);
+                               dev->param.markNANDBlockBad(dev, i);
                                bi->blockState = YAFFS_BLOCK_STATE_DEAD;
                        }
                }
@@ -60,13 +59,13 @@ static int yaffs_CheckpointErase(yaffs_D
 }
 
 
-static void yaffs_CheckpointFindNextErasedBlock(yaffs_Device *dev)
+static void yaffs2_CheckpointFindNextErasedBlock(yaffs_Device *dev)
 {
        int  i;
-       int blocksAvailable = dev->nErasedBlocks - dev->nReservedBlocks;
+       int blocksAvailable = dev->nErasedBlocks - dev->param.nReservedBlocks;
        T(YAFFS_TRACE_CHECKPOINT,
                (TSTR("allocating checkpt block: erased %d reserved %d avail %d next %d "TENDSTR),
-               dev->nErasedBlocks, dev->nReservedBlocks, blocksAvailable, dev->checkpointNextBlock));
+               dev->nErasedBlocks, dev->param.nReservedBlocks, blocksAvailable, dev->checkpointNextBlock));
 
        if (dev->checkpointNextBlock >= 0 &&
                        dev->checkpointNextBlock <= dev->internalEndBlock &&
@@ -88,7 +87,7 @@ static void yaffs_CheckpointFindNextEras
        dev->checkpointCurrentBlock = -1;
 }
 
-static void yaffs_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
+static void yaffs2_CheckpointFindNextCheckpointBlock(yaffs_Device *dev)
 {
        int  i;
        yaffs_ExtendedTags tags;
@@ -98,10 +97,10 @@ static void yaffs_CheckpointFindNextChec
 
        if (dev->blocksInCheckpoint < dev->checkpointMaxBlocks)
                for (i = dev->checkpointNextBlock; i <= dev->internalEndBlock; i++) {
-                       int chunk = i * dev->nChunksPerBlock;
+                       int chunk = i * dev->param.nChunksPerBlock;
                        int realignedChunk = chunk - dev->chunkOffset;
 
-                       dev->readChunkWithTagsFromNAND(dev, realignedChunk,
+                       dev->param.readChunkWithTagsFromNAND(dev, realignedChunk,
                                        NULL, &tags);
                        T(YAFFS_TRACE_CHECKPOINT, (TSTR("find next checkpt block: search: block %d oid %d seq %d eccr %d" TENDSTR),
                                i, tags.objectId, tags.sequenceNumber, tags.eccResult));
@@ -124,29 +123,29 @@ static void yaffs_CheckpointFindNextChec
 }
 
 
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting)
+int yaffs2_CheckpointOpen(yaffs_Device *dev, int forWriting)
 {
 
+
+       dev->checkpointOpenForWrite = forWriting;
+
        /* Got the functions we need? */
-       if (!dev->writeChunkWithTagsToNAND ||
-                       !dev->readChunkWithTagsFromNAND ||
-                       !dev->eraseBlockInNAND ||
-                       !dev->markNANDBlockBad)
+       if (!dev->param.writeChunkWithTagsToNAND ||
+               !dev->param.readChunkWithTagsFromNAND ||
+               !dev->param.eraseBlockInNAND ||
+               !dev->param.markNANDBlockBad)
                return 0;
 
-       if (forWriting && !yaffs_CheckpointSpaceOk(dev))
+       if (forWriting && !yaffs2_CheckpointSpaceOk(dev))
                return 0;
 
        if (!dev->checkpointBuffer)
-               dev->checkpointBuffer = YMALLOC_DMA(dev->totalBytesPerChunk);
+               dev->checkpointBuffer = YMALLOC_DMA(dev->param.totalBytesPerChunk);
        if (!dev->checkpointBuffer)
                return 0;
 
 
        dev->checkpointPageSequence = 0;
-
-       dev->checkpointOpenForWrite = forWriting;
-
        dev->checkpointByteCount = 0;
        dev->checkpointSum = 0;
        dev->checkpointXor = 0;
@@ -158,7 +157,7 @@ int yaffs_CheckpointOpen(yaffs_Device *d
        if (forWriting) {
                memset(dev->checkpointBuffer, 0, dev->nDataBytesPerChunk);
                dev->checkpointByteOffset = 0;
-               return yaffs_CheckpointErase(dev);
+               return yaffs2_CheckpointErase(dev);
        } else {
                int i;
                /* Set to a value that will kick off a read */
@@ -168,6 +167,9 @@ int yaffs_CheckpointOpen(yaffs_Device *d
                dev->blocksInCheckpoint = 0;
                dev->checkpointMaxBlocks = (dev->internalEndBlock - dev->internalStartBlock)/16 + 2;
                dev->checkpointBlockList = YMALLOC(sizeof(int) * dev->checkpointMaxBlocks);
+               if(!dev->checkpointBlockList)
+                       return 0;
+
                for (i = 0; i < dev->checkpointMaxBlocks; i++)
                        dev->checkpointBlockList[i] = -1;
        }
@@ -175,7 +177,7 @@ int yaffs_CheckpointOpen(yaffs_Device *d
        return 1;
 }
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
+int yaffs2_GetCheckpointSum(yaffs_Device *dev, __u32 *sum)
 {
        __u32 compositeSum;
        compositeSum =  (dev->checkpointSum << 8) | (dev->checkpointXor & 0xFF);
@@ -183,7 +185,7 @@ int yaffs_GetCheckpointSum(yaffs_Device
        return 1;
 }
 
-static int yaffs_CheckpointFlushBuffer(yaffs_Device *dev)
+static int yaffs2_CheckpointFlushBuffer(yaffs_Device *dev)
 {
        int chunk;
        int realignedChunk;
@@ -191,7 +193,7 @@ static int yaffs_CheckpointFlushBuffer(y
        yaffs_ExtendedTags tags;
 
        if (dev->checkpointCurrentBlock < 0) {
-               yaffs_CheckpointFindNextErasedBlock(dev);
+               yaffs2_CheckpointFindNextErasedBlock(dev);
                dev->checkpointCurrentChunk = 0;
        }
 
@@ -211,7 +213,7 @@ static int yaffs_CheckpointFlushBuffer(y
                dev->blocksInCheckpoint++;
        }
 
-       chunk = dev->checkpointCurrentBlock * dev->nChunksPerBlock + dev->checkpointCurrentChunk;
+       chunk = dev->checkpointCurrentBlock * dev->param.nChunksPerBlock + dev->checkpointCurrentChunk;
 
 
        T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint wite buffer nand %d(%d:%d) objid %d chId %d" TENDSTR),
@@ -219,12 +221,14 @@ static int yaffs_CheckpointFlushBuffer(y
 
        realignedChunk = chunk - dev->chunkOffset;
 
-       dev->writeChunkWithTagsToNAND(dev, realignedChunk,
+       dev->nPageWrites++;
+
+       dev->param.writeChunkWithTagsToNAND(dev, realignedChunk,
                        dev->checkpointBuffer, &tags);
        dev->checkpointByteOffset = 0;
        dev->checkpointPageSequence++;
        dev->checkpointCurrentChunk++;
-       if (dev->checkpointCurrentChunk >= dev->nChunksPerBlock) {
+       if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock) {
                dev->checkpointCurrentChunk = 0;
                dev->checkpointCurrentBlock = -1;
        }
@@ -234,7 +238,7 @@ static int yaffs_CheckpointFlushBuffer(y
 }
 
 
-int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
+int yaffs2_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes)
 {
        int i = 0;
        int ok = 1;
@@ -263,13 +267,13 @@ int yaffs_CheckpointWrite(yaffs_Device *
 
                if (dev->checkpointByteOffset < 0 ||
                   dev->checkpointByteOffset >= dev->nDataBytesPerChunk)
-                       ok = yaffs_CheckpointFlushBuffer(dev);
+                       ok = yaffs2_CheckpointFlushBuffer(dev);
        }
 
        return i;
 }
 
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
+int yaffs2_CheckpointRead(yaffs_Device *dev, void *data, int nBytes)
 {
        int i = 0;
        int ok = 1;
@@ -294,7 +298,7 @@ int yaffs_CheckpointRead(yaffs_Device *d
                        dev->checkpointByteOffset >= dev->nDataBytesPerChunk) {
 
                        if (dev->checkpointCurrentBlock < 0) {
-                               yaffs_CheckpointFindNextCheckpointBlock(dev);
+                               yaffs2_CheckpointFindNextCheckpointBlock(dev);
                                dev->checkpointCurrentChunk = 0;
                        }
 
@@ -302,14 +306,16 @@ int yaffs_CheckpointRead(yaffs_Device *d
                                ok = 0;
                        else {
                                chunk = dev->checkpointCurrentBlock *
-                                       dev->nChunksPerBlock +
+                                       dev->param.nChunksPerBlock +
                                        dev->checkpointCurrentChunk;
 
                                realignedChunk = chunk - dev->chunkOffset;
+                               
+                               dev->nPageReads++;
 
                                /* read in the next chunk */
                                /* printf("read checkpoint page %d\n",dev->checkpointPage); */
-                               dev->readChunkWithTagsFromNAND(dev,
+                               dev->param.readChunkWithTagsFromNAND(dev,
                                                realignedChunk,
                                                dev->checkpointBuffer,
                                                &tags);
@@ -323,7 +329,7 @@ int yaffs_CheckpointRead(yaffs_Device *d
                                dev->checkpointPageSequence++;
                                dev->checkpointCurrentChunk++;
 
-                               if (dev->checkpointCurrentChunk >= dev->nChunksPerBlock)
+                               if (dev->checkpointCurrentChunk >= dev->param.nChunksPerBlock)
                                        dev->checkpointCurrentBlock = -1;
                        }
                }
@@ -342,17 +348,20 @@ int yaffs_CheckpointRead(yaffs_Device *d
        return  i;
 }
 
-int yaffs_CheckpointClose(yaffs_Device *dev)
+int yaffs2_CheckpointClose(yaffs_Device *dev)
 {
 
        if (dev->checkpointOpenForWrite) {
                if (dev->checkpointByteOffset != 0)
-                       yaffs_CheckpointFlushBuffer(dev);
-       } else {
+                       yaffs2_CheckpointFlushBuffer(dev);
+       } else if(dev->checkpointBlockList){
                int i;
                for (i = 0; i < dev->blocksInCheckpoint && dev->checkpointBlockList[i] >= 0; i++) {
-                       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->checkpointBlockList[i]);
-                       if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
+                       int blk = dev->checkpointBlockList[i];
+                       yaffs_BlockInfo *bi = NULL;
+                       if( dev->internalStartBlock <= blk && blk <= dev->internalEndBlock)
+                               bi = yaffs_GetBlockInfo(dev, blk);
+                       if (bi && bi->blockState == YAFFS_BLOCK_STATE_EMPTY)
                                bi->blockState = YAFFS_BLOCK_STATE_CHECKPOINT;
                        else {
                                /* Todo this looks odd... */
@@ -362,7 +371,7 @@ int yaffs_CheckpointClose(yaffs_Device *
                dev->checkpointBlockList = NULL;
        }
 
-       dev->nFreeChunks -= dev->blocksInCheckpoint * dev->nChunksPerBlock;
+       dev->nFreeChunks -= dev->blocksInCheckpoint * dev->param.nChunksPerBlock;
        dev->nErasedBlocks -= dev->blocksInCheckpoint;
 
 
@@ -378,16 +387,14 @@ int yaffs_CheckpointClose(yaffs_Device *
                return 0;
 }
 
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev)
+int yaffs2_CheckpointInvalidateStream(yaffs_Device *dev)
 {
-       /* Erase the first checksum block */
-
-       T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate"TENDSTR)));
+       /* Erase the checkpoint data */
 
-       if (!yaffs_CheckpointSpaceOk(dev))
-               return 0;
+       T(YAFFS_TRACE_CHECKPOINT, (TSTR("checkpoint invalidate of %d blocks"TENDSTR),
+               dev->blocksInCheckpoint));
 
-       return yaffs_CheckpointErase(dev);
+       return yaffs2_CheckpointErase(dev);
 }
 
 
--- a/fs/yaffs2/yaffs_checkptrw.h
+++ b/fs/yaffs2/yaffs_checkptrw.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -18,18 +18,17 @@
 
 #include "yaffs_guts.h"
 
-int yaffs_CheckpointOpen(yaffs_Device *dev, int forWriting);
+int yaffs2_CheckpointOpen(yaffs_Device *dev, int forWriting);
 
-int yaffs_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes);
+int yaffs2_CheckpointWrite(yaffs_Device *dev, const void *data, int nBytes);
 
-int yaffs_CheckpointRead(yaffs_Device *dev, void *data, int nBytes);
+int yaffs2_CheckpointRead(yaffs_Device *dev, void *data, int nBytes);
 
-int yaffs_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
+int yaffs2_GetCheckpointSum(yaffs_Device *dev, __u32 *sum);
 
-int yaffs_CheckpointClose(yaffs_Device *dev);
+int yaffs2_CheckpointClose(yaffs_Device *dev);
 
-int yaffs_CheckpointInvalidateStream(yaffs_Device *dev);
+int yaffs2_CheckpointInvalidateStream(yaffs_Device *dev);
 
 
 #endif
-
--- a/fs/yaffs2/yaffs_ecc.c
+++ b/fs/yaffs2/yaffs_ecc.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -28,9 +28,6 @@
  * this bytes influence on the line parity.
  */
 
-const char *yaffs_ecc_c_version =
-       "$Id: yaffs_ecc.c,v 1.11 2009-03-06 17:20:50 wookey Exp $";
-
 #include "yportenv.h"
 
 #include "yaffs_ecc.h"
--- a/fs/yaffs2/yaffs_ecc.h
+++ b/fs/yaffs2/yaffs_ecc.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_fs.c
+++ /dev/null
@@ -1,2529 +0,0 @@
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2009 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * Created by Charles Manning <charles@aleph1.co.uk>
- * Acknowledgements:
- * Luc van OostenRyck for numerous patches.
- * Nick Bane for numerous patches.
- * Nick Bane for 2.5/2.6 integration.
- * Andras Toth for mknod rdev issue.
- * Michael Fischer for finding the problem with inode inconsistency.
- * Some code bodily lifted from JFFS
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- *
- * This is the file system front-end to YAFFS that hooks it up to
- * the VFS.
- *
- * Special notes:
- * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
- *         this superblock
- * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
- *         superblock
- * >> inode->u.generic_ip points to the associated yaffs_Object.
- */
-
-const char *yaffs_fs_c_version =
-    "$Id: yaffs_fs.c,v 1.79 2009-03-17 01:12:00 wookey Exp $";
-extern const char *yaffs_guts_c_version;
-
-#include <linux/version.h>
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
-#include <linux/config.h>
-#endif
-#include <linux/kernel.h>
-#include <linux/module.h>
-#include <linux/slab.h>
-#include <linux/init.h>
-#include <linux/fs.h>
-#include <linux/proc_fs.h>
-#include <linux/smp_lock.h>
-#include <linux/pagemap.h>
-#include <linux/mtd/mtd.h>
-#include <linux/interrupt.h>
-#include <linux/string.h>
-#include <linux/ctype.h>
-
-#include "asm/div64.h"
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-
-#include <linux/statfs.h>      /* Added NCB 15-8-2003 */
-#include <linux/statfs.h>
-#define UnlockPage(p) unlock_page(p)
-#define Page_Uptodate(page)    test_bit(PG_uptodate, &(page)->flags)
-
-/* FIXME: use sb->s_id instead ? */
-#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
-
-#else
-
-#include <linux/locks.h>
-#define        BDEVNAME_SIZE           0
-#define        yaffs_devname(sb, buf)  kdevname(sb->s_dev)
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
-/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
-#define __user
-#endif
-
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
-#define YPROC_ROOT  (&proc_root)
-#else
-#define YPROC_ROOT  NULL
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-#define WRITE_SIZE_STR "writesize"
-#define WRITE_SIZE(mtd) ((mtd)->writesize)
-#else
-#define WRITE_SIZE_STR "oobblock"
-#define WRITE_SIZE(mtd) ((mtd)->oobblock)
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
-#define YAFFS_USE_WRITE_BEGIN_END 1
-#else
-#define YAFFS_USE_WRITE_BEGIN_END 0
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
-static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
-{
-       uint64_t result = partition_size;
-       do_div(result, block_size);
-       return (uint32_t)result;
-}
-#else
-#define YCALCBLOCKS(s, b) ((s)/(b))
-#endif
-
-#include <linux/uaccess.h>
-
-#include "yportenv.h"
-#include "yaffs_guts.h"
-
-#include <linux/mtd/mtd.h>
-#include "yaffs_mtdif.h"
-#include "yaffs_mtdif1.h"
-#include "yaffs_mtdif2.h"
-
-unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS;
-unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
-unsigned int yaffs_auto_checkpoint = 1;
-
-/* Module Parameters */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-module_param(yaffs_traceMask, uint, 0644);
-module_param(yaffs_wr_attempts, uint, 0644);
-module_param(yaffs_auto_checkpoint, uint, 0644);
-#else
-MODULE_PARM(yaffs_traceMask, "i");
-MODULE_PARM(yaffs_wr_attempts, "i");
-MODULE_PARM(yaffs_auto_checkpoint, "i");
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
-/* use iget and read_inode */
-#define Y_IGET(sb, inum) iget((sb), (inum))
-static void yaffs_read_inode(struct inode *inode);
-
-#else
-/* Call local equivalent */
-#define YAFFS_USE_OWN_IGET
-#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
-
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
-#endif
-
-/*#define T(x) printk x */
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
-#define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
-#else
-#define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
-#endif
-
-#define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
-#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-#define yaffs_SuperToDevice(sb)        ((yaffs_Device *)sb->s_fs_info)
-#else
-#define yaffs_SuperToDevice(sb)        ((yaffs_Device *)sb->u.generic_sbp)
-#endif
-
-static void yaffs_put_super(struct super_block *sb);
-
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
-                               loff_t *pos);
-static ssize_t yaffs_hold_space(struct file *f);
-static void yaffs_release_space(struct file *f);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_file_flush(struct file *file, fl_owner_t id);
-#else
-static int yaffs_file_flush(struct file *file);
-#endif
-
-static int yaffs_sync_object(struct file *file, struct dentry *dentry,
-                               int datasync);
-
-static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
-                       struct nameidata *n);
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
-                                       struct nameidata *n);
-#else
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
-#endif
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
-                       struct dentry *dentry);
-static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
-                       const char *symname);
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-                       dev_t dev);
-#else
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-                       int dev);
-#endif
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
-                       struct inode *new_dir, struct dentry *new_dentry);
-static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_sync_fs(struct super_block *sb, int wait);
-static void yaffs_write_super(struct super_block *sb);
-#else
-static int yaffs_sync_fs(struct super_block *sb);
-static int yaffs_write_super(struct super_block *sb);
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
-#else
-static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
-#endif
-
-#ifdef YAFFS_HAS_PUT_INODE
-static void yaffs_put_inode(struct inode *inode);
-#endif
-
-static void yaffs_delete_inode(struct inode *);
-static void yaffs_clear_inode(struct inode *);
-
-static int yaffs_readpage(struct file *file, struct page *page);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
-#else
-static int yaffs_writepage(struct page *page);
-#endif
-
-
-#if (YAFFS_USE_WRITE_BEGIN_END != 0)
-static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
-                               loff_t pos, unsigned len, unsigned flags,
-                               struct page **pagep, void **fsdata);
-static int yaffs_write_end(struct file *filp, struct address_space *mapping,
-                               loff_t pos, unsigned len, unsigned copied,
-                               struct page *pg, void *fsdadata);
-#else
-static int yaffs_prepare_write(struct file *f, struct page *pg,
-                               unsigned offset, unsigned to);
-static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
-                               unsigned to);
-
-#endif
-
-static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
-                               int buflen);
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
-#else
-static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
-#endif
-
-static struct address_space_operations yaffs_file_address_operations = {
-       .readpage = yaffs_readpage,
-       .writepage = yaffs_writepage,
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-       .write_begin = yaffs_write_begin,
-       .write_end = yaffs_write_end,
-#else
-       .prepare_write = yaffs_prepare_write,
-       .commit_write = yaffs_commit_write,
-#endif
-};
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
-static const struct file_operations yaffs_file_operations = {
-       .read = do_sync_read,
-       .write = do_sync_write,
-       .aio_read = generic_file_aio_read,
-       .aio_write = generic_file_aio_write,
-       .mmap = generic_file_mmap,
-       .flush = yaffs_file_flush,
-       .fsync = yaffs_sync_object,
-       .splice_read = generic_file_splice_read,
-       .splice_write = generic_file_splice_write,
-       .llseek = generic_file_llseek,
-};
-
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
-
-static const struct file_operations yaffs_file_operations = {
-       .read = do_sync_read,
-       .write = do_sync_write,
-       .aio_read = generic_file_aio_read,
-       .aio_write = generic_file_aio_write,
-       .mmap = generic_file_mmap,
-       .flush = yaffs_file_flush,
-       .fsync = yaffs_sync_object,
-       .sendfile = generic_file_sendfile,
-};
-
-#else
-
-static const struct file_operations yaffs_file_operations = {
-       .read = generic_file_read,
-       .write = generic_file_write,
-       .mmap = generic_file_mmap,
-       .flush = yaffs_file_flush,
-       .fsync = yaffs_sync_object,
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-       .sendfile = generic_file_sendfile,
-#endif
-};
-#endif
-
-static const struct inode_operations yaffs_file_inode_operations = {
-       .setattr = yaffs_setattr,
-};
-
-static const struct inode_operations yaffs_symlink_inode_operations = {
-       .readlink = yaffs_readlink,
-       .follow_link = yaffs_follow_link,
-       .setattr = yaffs_setattr,
-};
-
-static const struct inode_operations yaffs_dir_inode_operations = {
-       .create = yaffs_create,
-       .lookup = yaffs_lookup,
-       .link = yaffs_link,
-       .unlink = yaffs_unlink,
-       .symlink = yaffs_symlink,
-       .mkdir = yaffs_mkdir,
-       .rmdir = yaffs_unlink,
-       .mknod = yaffs_mknod,
-       .rename = yaffs_rename,
-       .setattr = yaffs_setattr,
-};
-
-static const struct file_operations yaffs_dir_operations = {
-       .read = generic_read_dir,
-       .readdir = yaffs_readdir,
-       .fsync = yaffs_sync_object,
-};
-
-static const struct super_operations yaffs_super_ops = {
-       .statfs = yaffs_statfs,
-
-#ifndef YAFFS_USE_OWN_IGET
-       .read_inode = yaffs_read_inode,
-#endif
-#ifdef YAFFS_HAS_PUT_INODE
-       .put_inode = yaffs_put_inode,
-#endif
-       .put_super = yaffs_put_super,
-       .delete_inode = yaffs_delete_inode,
-       .clear_inode = yaffs_clear_inode,
-       .sync_fs = yaffs_sync_fs,
-       .write_super = yaffs_write_super,
-};
-
-static void yaffs_GrossLock(yaffs_Device *dev)
-{
-       T(YAFFS_TRACE_OS, ("yaffs locking %p\n", current));
-       down(&dev->grossLock);
-       T(YAFFS_TRACE_OS, ("yaffs locked %p\n", current));
-}
-
-static void yaffs_GrossUnlock(yaffs_Device *dev)
-{
-       T(YAFFS_TRACE_OS, ("yaffs unlocking %p\n", current));
-       up(&dev->grossLock);
-}
-
-static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
-                       int buflen)
-{
-       unsigned char *alias;
-       int ret;
-
-       yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
-
-       yaffs_GrossLock(dev);
-
-       alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
-
-       yaffs_GrossUnlock(dev);
-
-       if (!alias)
-               return -ENOMEM;
-
-       ret = vfs_readlink(dentry, buffer, buflen, alias);
-       kfree(alias);
-       return ret;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-#else
-static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-#endif
-{
-       unsigned char *alias;
-       int ret;
-       yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
-
-       yaffs_GrossLock(dev);
-
-       alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
-
-       yaffs_GrossUnlock(dev);
-
-       if (!alias) {
-               ret = -ENOMEM;
-               goto out;
-       }
-
-       ret = vfs_follow_link(nd, alias);
-       kfree(alias);
-out:
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-       return ERR_PTR(ret);
-#else
-       return ret;
-#endif
-}
-
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
-                               yaffs_Object *obj);
-
-/*
- * Lookup is used to find objects in the fs
- */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
-                               struct nameidata *n)
-#else
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
-#endif
-{
-       yaffs_Object *obj;
-       struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
-
-       yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
-
-       yaffs_GrossLock(dev);
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_lookup for %d:%s\n",
-               yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
-
-       obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
-                                       dentry->d_name.name);
-
-       obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
-
-       /* Can't hold gross lock when calling yaffs_get_inode() */
-       yaffs_GrossUnlock(dev);
-
-       if (obj) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_lookup found %d\n", obj->objectId));
-
-               inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
-
-               if (inode) {
-                       T(YAFFS_TRACE_OS,
-                               ("yaffs_loookup dentry \n"));
-/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
- * d_add even if NULL inode */
-#if 0
-                       /*dget(dentry); // try to solve directory bug */
-                       d_add(dentry, inode);
-
-                       /* return dentry; */
-                       return NULL;
-#endif
-               }
-
-       } else {
-               T(YAFFS_TRACE_OS, ("yaffs_lookup not found\n"));
-
-       }
-
-/* added NCB for 2.5/6 compatability - forces add even if inode is
- * NULL which creates dentry hash */
-       d_add(dentry, inode);
-
-       return NULL;
-}
-
-
-#ifdef YAFFS_HAS_PUT_INODE
-
-/* For now put inode is just for debugging
- * Put inode is called when the inode **structure** is put.
- */
-static void yaffs_put_inode(struct inode *inode)
-{
-       T(YAFFS_TRACE_OS,
-               ("yaffs_put_inode: ino %d, count %d\n", (int)inode->i_ino,
-               atomic_read(&inode->i_count)));
-
-}
-#endif
-
-/* clear is called to tell the fs to release any per-inode data it holds */
-static void yaffs_clear_inode(struct inode *inode)
-{
-       yaffs_Object *obj;
-       yaffs_Device *dev;
-
-       obj = yaffs_InodeToObject(inode);
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_clear_inode: ino %d, count %d %s\n", (int)inode->i_ino,
-               atomic_read(&inode->i_count),
-               obj ? "object exists" : "null object"));
-
-       if (obj) {
-               dev = obj->myDev;
-               yaffs_GrossLock(dev);
-
-               /* Clear the association between the inode and
-                * the yaffs_Object.
-                */
-               obj->myInode = NULL;
-               yaffs_InodeToObjectLV(inode) = NULL;
-
-               /* If the object freeing was deferred, then the real
-                * free happens now.
-                * This should fix the inode inconsistency problem.
-                */
-
-               yaffs_HandleDeferedFree(obj);
-
-               yaffs_GrossUnlock(dev);
-       }
-
-}
-
-/* delete is called when the link count is zero and the inode
- * is put (ie. nobody wants to know about it anymore, time to
- * delete the file).
- * NB Must call clear_inode()
- */
-static void yaffs_delete_inode(struct inode *inode)
-{
-       yaffs_Object *obj = yaffs_InodeToObject(inode);
-       yaffs_Device *dev;
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_delete_inode: ino %d, count %d %s\n", (int)inode->i_ino,
-               atomic_read(&inode->i_count),
-               obj ? "object exists" : "null object"));
-
-       if (obj) {
-               dev = obj->myDev;
-               yaffs_GrossLock(dev);
-               yaffs_DeleteObject(obj);
-               yaffs_GrossUnlock(dev);
-       }
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
-       truncate_inode_pages(&inode->i_data, 0);
-#endif
-       clear_inode(inode);
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_file_flush(struct file *file, fl_owner_t id)
-#else
-static int yaffs_file_flush(struct file *file)
-#endif
-{
-       yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
-
-       yaffs_Device *dev = obj->myDev;
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_file_flush object %d (%s)\n", obj->objectId,
-               obj->dirty ? "dirty" : "clean"));
-
-       yaffs_GrossLock(dev);
-
-       yaffs_FlushFile(obj, 1);
-
-       yaffs_GrossUnlock(dev);
-
-       return 0;
-}
-
-static int yaffs_readpage_nolock(struct file *f, struct page *pg)
-{
-       /* Lifted from jffs2 */
-
-       yaffs_Object *obj;
-       unsigned char *pg_buf;
-       int ret;
-
-       yaffs_Device *dev;
-
-       T(YAFFS_TRACE_OS, ("yaffs_readpage at %08x, size %08x\n",
-                       (unsigned)(pg->index << PAGE_CACHE_SHIFT),
-                       (unsigned)PAGE_CACHE_SIZE));
-
-       obj = yaffs_DentryToObject(f->f_dentry);
-
-       dev = obj->myDev;
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-       BUG_ON(!PageLocked(pg));
-#else
-       if (!PageLocked(pg))
-               PAGE_BUG(pg);
-#endif
-
-       pg_buf = kmap(pg);
-       /* FIXME: Can kmap fail? */
-
-       yaffs_GrossLock(dev);
-
-       ret = yaffs_ReadDataFromFile(obj, pg_buf,
-                               pg->index << PAGE_CACHE_SHIFT,
-                               PAGE_CACHE_SIZE);
-
-       yaffs_GrossUnlock(dev);
-
-       if (ret >= 0)
-               ret = 0;
-
-       if (ret) {
-               ClearPageUptodate(pg);
-               SetPageError(pg);
-       } else {
-               SetPageUptodate(pg);
-               ClearPageError(pg);
-       }
-
-       flush_dcache_page(pg);
-       kunmap(pg);
-
-       T(YAFFS_TRACE_OS, ("yaffs_readpage done\n"));
-       return ret;
-}
-
-static int yaffs_readpage_unlock(struct file *f, struct page *pg)
-{
-       int ret = yaffs_readpage_nolock(f, pg);
-       UnlockPage(pg);
-       return ret;
-}
-
-static int yaffs_readpage(struct file *f, struct page *pg)
-{
-       return yaffs_readpage_unlock(f, pg);
-}
-
-/* writepage inspired by/stolen from smbfs */
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
-#else
-static int yaffs_writepage(struct page *page)
-#endif
-{
-       struct address_space *mapping = page->mapping;
-       loff_t offset = (loff_t) page->index << PAGE_CACHE_SHIFT;
-       struct inode *inode;
-       unsigned long end_index;
-       char *buffer;
-       yaffs_Object *obj;
-       int nWritten = 0;
-       unsigned nBytes;
-
-       if (!mapping)
-               BUG();
-       inode = mapping->host;
-       if (!inode)
-               BUG();
-
-       if (offset > inode->i_size) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_writepage at %08x, inode size = %08x!!!\n",
-                       (unsigned)(page->index << PAGE_CACHE_SHIFT),
-                       (unsigned)inode->i_size));
-               T(YAFFS_TRACE_OS,
-                       ("                -> don't care!!\n"));
-               unlock_page(page);
-               return 0;
-       }
-
-       end_index = inode->i_size >> PAGE_CACHE_SHIFT;
-
-       /* easy case */
-       if (page->index < end_index)
-               nBytes = PAGE_CACHE_SIZE;
-       else
-               nBytes = inode->i_size & (PAGE_CACHE_SIZE - 1);
-
-       get_page(page);
-
-       buffer = kmap(page);
-
-       obj = yaffs_InodeToObject(inode);
-       yaffs_GrossLock(obj->myDev);
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_writepage at %08x, size %08x\n",
-               (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
-       T(YAFFS_TRACE_OS,
-               ("writepag0: obj = %05x, ino = %05x\n",
-               (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
-
-       nWritten = yaffs_WriteDataToFile(obj, buffer,
-                       page->index << PAGE_CACHE_SHIFT, nBytes, 0);
-
-       T(YAFFS_TRACE_OS,
-               ("writepag1: obj = %05x, ino = %05x\n",
-               (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
-
-       yaffs_GrossUnlock(obj->myDev);
-
-       kunmap(page);
-       SetPageUptodate(page);
-       UnlockPage(page);
-       put_page(page);
-
-       return (nWritten == nBytes) ? 0 : -ENOSPC;
-}
-
-
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
-                               loff_t pos, unsigned len, unsigned flags,
-                               struct page **pagep, void **fsdata)
-{
-       struct page *pg = NULL;
-       pgoff_t index = pos >> PAGE_CACHE_SHIFT;
-       uint32_t offset = pos & (PAGE_CACHE_SIZE - 1);
-       uint32_t to = offset + len;
-
-       int ret = 0;
-       int space_held = 0;
-
-       T(YAFFS_TRACE_OS, ("start yaffs_write_begin\n"));
-       /* Get a page */
-#if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28)
-       pg = grab_cache_page_write_begin(mapping, index, flags);
-#else
-       pg = __grab_cache_page(mapping, index);
-#endif
-
-       *pagep = pg;
-       if (!pg) {
-               ret =  -ENOMEM;
-               goto out;
-       }
-       /* Get fs space */
-       space_held = yaffs_hold_space(filp);
-
-       if (!space_held) {
-               ret = -ENOSPC;
-               goto out;
-       }
-
-       /* Update page if required */
-
-       if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
-               ret = yaffs_readpage_nolock(filp, pg);
-
-       if (ret)
-               goto out;
-
-       /* Happy path return */
-       T(YAFFS_TRACE_OS, ("end yaffs_write_begin - ok\n"));
-
-       return 0;
-
-out:
-       T(YAFFS_TRACE_OS, ("end yaffs_write_begin fail returning %d\n", ret));
-       if (space_held)
-               yaffs_release_space(filp);
-       if (pg) {
-               unlock_page(pg);
-               page_cache_release(pg);
-       }
-       return ret;
-}
-
-#else
-
-static int yaffs_prepare_write(struct file *f, struct page *pg,
-                               unsigned offset, unsigned to)
-{
-       T(YAFFS_TRACE_OS, ("yaffs_prepair_write\n"));
-
-       if (!Page_Uptodate(pg) && (offset || to < PAGE_CACHE_SIZE))
-               return yaffs_readpage_nolock(f, pg);
-       return 0;
-}
-#endif
-
-#if (YAFFS_USE_WRITE_BEGIN_END > 0)
-static int yaffs_write_end(struct file *filp, struct address_space *mapping,
-                               loff_t pos, unsigned len, unsigned copied,
-                               struct page *pg, void *fsdadata)
-{
-       int ret = 0;
-       void *addr, *kva;
-       uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
-
-       kva = kmap(pg);
-       addr = kva + offset_into_page;
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_write_end addr %x pos %x nBytes %d\n",
-               (unsigned) addr,
-               (int)pos, copied));
-
-       ret = yaffs_file_write(filp, addr, copied, &pos);
-
-       if (ret != copied) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_write_end not same size ret %d  copied %d\n",
-                       ret, copied));
-               SetPageError(pg);
-               ClearPageUptodate(pg);
-       } else {
-               SetPageUptodate(pg);
-       }
-
-       kunmap(pg);
-
-       yaffs_release_space(filp);
-       unlock_page(pg);
-       page_cache_release(pg);
-       return ret;
-}
-#else
-
-static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
-                               unsigned to)
-{
-       void *addr, *kva;
-
-       loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
-       int nBytes = to - offset;
-       int nWritten;
-
-       unsigned spos = pos;
-       unsigned saddr;
-
-       kva = kmap(pg);
-       addr = kva + offset;
-
-       saddr = (unsigned) addr;
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_commit_write addr %x pos %x nBytes %d\n",
-               saddr, spos, nBytes));
-
-       nWritten = yaffs_file_write(f, addr, nBytes, &pos);
-
-       if (nWritten != nBytes) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_commit_write not same size nWritten %d  nBytes %d\n",
-                       nWritten, nBytes));
-               SetPageError(pg);
-               ClearPageUptodate(pg);
-       } else {
-               SetPageUptodate(pg);
-       }
-
-       kunmap(pg);
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_commit_write returning %d\n",
-               nWritten == nBytes ? 0 : nWritten));
-
-       return nWritten == nBytes ? 0 : nWritten;
-}
-#endif
-
-
-static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
-{
-       if (inode && obj) {
-
-
-               /* Check mode against the variant type and attempt to repair if broken. */
-               __u32 mode = obj->yst_mode;
-               switch (obj->variantType) {
-               case YAFFS_OBJECT_TYPE_FILE:
-                       if (!S_ISREG(mode)) {
-                               obj->yst_mode &= ~S_IFMT;
-                               obj->yst_mode |= S_IFREG;
-                       }
-
-                       break;
-               case YAFFS_OBJECT_TYPE_SYMLINK:
-                       if (!S_ISLNK(mode)) {
-                               obj->yst_mode &= ~S_IFMT;
-                               obj->yst_mode |= S_IFLNK;
-                       }
-
-                       break;
-               case YAFFS_OBJECT_TYPE_DIRECTORY:
-                       if (!S_ISDIR(mode)) {
-                               obj->yst_mode &= ~S_IFMT;
-                               obj->yst_mode |= S_IFDIR;
-                       }
-
-                       break;
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-               default:
-                       /* TODO? */
-                       break;
-               }
-
-               inode->i_flags |= S_NOATIME;
-
-               inode->i_ino = obj->objectId;
-               inode->i_mode = obj->yst_mode;
-               inode->i_uid = obj->yst_uid;
-               inode->i_gid = obj->yst_gid;
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
-               inode->i_blksize = inode->i_sb->s_blocksize;
-#endif
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-
-               inode->i_rdev = old_decode_dev(obj->yst_rdev);
-               inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
-               inode->i_atime.tv_nsec = 0;
-               inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
-               inode->i_mtime.tv_nsec = 0;
-               inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
-               inode->i_ctime.tv_nsec = 0;
-#else
-               inode->i_rdev = obj->yst_rdev;
-               inode->i_atime = obj->yst_atime;
-               inode->i_mtime = obj->yst_mtime;
-               inode->i_ctime = obj->yst_ctime;
-#endif
-               inode->i_size = yaffs_GetObjectFileLength(obj);
-               inode->i_blocks = (inode->i_size + 511) >> 9;
-
-               inode->i_nlink = yaffs_GetObjectLinkCount(obj);
-
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n",
-                       inode->i_mode, inode->i_uid, inode->i_gid,
-                       (int)inode->i_size, atomic_read(&inode->i_count)));
-
-               switch (obj->yst_mode & S_IFMT) {
-               default:        /* fifo, device or socket */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-                       init_special_inode(inode, obj->yst_mode,
-                                       old_decode_dev(obj->yst_rdev));
-#else
-                       init_special_inode(inode, obj->yst_mode,
-                                       (dev_t) (obj->yst_rdev));
-#endif
-                       break;
-               case S_IFREG:   /* file */
-                       inode->i_op = &yaffs_file_inode_operations;
-                       inode->i_fop = &yaffs_file_operations;
-                       inode->i_mapping->a_ops =
-                               &yaffs_file_address_operations;
-                       break;
-               case S_IFDIR:   /* directory */
-                       inode->i_op = &yaffs_dir_inode_operations;
-                       inode->i_fop = &yaffs_dir_operations;
-                       break;
-               case S_IFLNK:   /* symlink */
-                       inode->i_op = &yaffs_symlink_inode_operations;
-                       break;
-               }
-
-               yaffs_InodeToObjectLV(inode) = obj;
-
-               obj->myInode = inode;
-
-       } else {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_FileInode invalid parameters\n"));
-       }
-
-}
-
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
-                               yaffs_Object *obj)
-{
-       struct inode *inode;
-
-       if (!sb) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_get_inode for NULL super_block!!\n"));
-               return NULL;
-
-       }
-
-       if (!obj) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_get_inode for NULL object!!\n"));
-               return NULL;
-
-       }
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_get_inode for object %d\n", obj->objectId));
-
-       inode = Y_IGET(sb, obj->objectId);
-       if (IS_ERR(inode))
-               return NULL;
-
-       /* NB Side effect: iget calls back to yaffs_read_inode(). */
-       /* iget also increments the inode's i_count */
-       /* NB You can't be holding grossLock or deadlock will happen! */
-
-       return inode;
-}
-
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
-                               loff_t *pos)
-{
-       yaffs_Object *obj;
-       int nWritten, ipos;
-       struct inode *inode;
-       yaffs_Device *dev;
-
-       obj = yaffs_DentryToObject(f->f_dentry);
-
-       dev = obj->myDev;
-
-       yaffs_GrossLock(dev);
-
-       inode = f->f_dentry->d_inode;
-
-       if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
-               ipos = inode->i_size;
-       else
-               ipos = *pos;
-
-       if (!obj)
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_file_write: hey obj is null!\n"));
-       else
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_file_write about to write writing %zu bytes"
-                       "to object %d at %d\n",
-                       n, obj->objectId, ipos));
-
-       nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_file_write writing %zu bytes, %d written at %d\n",
-               n, nWritten, ipos));
-
-       if (nWritten > 0) {
-               ipos += nWritten;
-               *pos = ipos;
-               if (ipos > inode->i_size) {
-                       inode->i_size = ipos;
-                       inode->i_blocks = (ipos + 511) >> 9;
-
-                       T(YAFFS_TRACE_OS,
-                               ("yaffs_file_write size updated to %d bytes, "
-                               "%d blocks\n",
-                               ipos, (int)(inode->i_blocks)));
-               }
-
-       }
-       yaffs_GrossUnlock(dev);
-       return nWritten == 0 ? -ENOSPC : nWritten;
-}
-
-/* Space holding and freeing is done to ensure we have space available for write_begin/end */
-/* For now we just assume few parallel writes and check against a small number. */
-/* Todo: need to do this with a counter to handle parallel reads better */
-
-static ssize_t yaffs_hold_space(struct file *f)
-{
-       yaffs_Object *obj;
-       yaffs_Device *dev;
-
-       int nFreeChunks;
-
-
-       obj = yaffs_DentryToObject(f->f_dentry);
-
-       dev = obj->myDev;
-
-       yaffs_GrossLock(dev);
-
-       nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
-
-       yaffs_GrossUnlock(dev);
-
-       return (nFreeChunks > 20) ? 1 : 0;
-}
-
-static void yaffs_release_space(struct file *f)
-{
-       yaffs_Object *obj;
-       yaffs_Device *dev;
-
-
-       obj = yaffs_DentryToObject(f->f_dentry);
-
-       dev = obj->myDev;
-
-       yaffs_GrossLock(dev);
-
-
-       yaffs_GrossUnlock(dev);
-}
-
-static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
-{
-       yaffs_Object *obj;
-       yaffs_Device *dev;
-       struct inode *inode = f->f_dentry->d_inode;
-       unsigned long offset, curoffs;
-       struct ylist_head *i;
-       yaffs_Object *l;
-
-       char name[YAFFS_MAX_NAME_LENGTH + 1];
-
-       obj = yaffs_DentryToObject(f->f_dentry);
-       dev = obj->myDev;
-
-       yaffs_GrossLock(dev);
-
-       offset = f->f_pos;
-
-       T(YAFFS_TRACE_OS, ("yaffs_readdir: starting at %d\n", (int)offset));
-
-       if (offset == 0) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_readdir: entry . ino %d \n",
-                       (int)inode->i_ino));
-               if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0)
-                       goto out;
-               offset++;
-               f->f_pos++;
-       }
-       if (offset == 1) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_readdir: entry .. ino %d \n",
-                       (int)f->f_dentry->d_parent->d_inode->i_ino));
-               if (filldir(dirent, "..", 2, offset,
-                       f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0)
-                       goto out;
-               offset++;
-               f->f_pos++;
-       }
-
-       curoffs = 1;
-
-       /* If the directory has changed since the open or last call to
-          readdir, rewind to after the 2 canned entries. */
-
-       if (f->f_version != inode->i_version) {
-               offset = 2;
-               f->f_pos = offset;
-               f->f_version = inode->i_version;
-       }
-
-       ylist_for_each(i, &obj->variant.directoryVariant.children) {
-               curoffs++;
-               if (curoffs >= offset) {
-                       l = ylist_entry(i, yaffs_Object, siblings);
-
-                       yaffs_GetObjectName(l, name,
-                                           YAFFS_MAX_NAME_LENGTH + 1);
-                       T(YAFFS_TRACE_OS,
-                         ("yaffs_readdir: %s inode %d\n", name,
-                          yaffs_GetObjectInode(l)));
-
-                       if (filldir(dirent,
-                                       name,
-                                       strlen(name),
-                                       offset,
-                                       yaffs_GetObjectInode(l),
-                                       yaffs_GetObjectType(l)) < 0)
-                               goto up_and_out;
-
-                       offset++;
-                       f->f_pos++;
-               }
-       }
-
-up_and_out:
-out:
-       yaffs_GrossUnlock(dev);
-
-       return 0;
-}
-
-/*
- * File creation. Allocate an inode, and we're done..
- */
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
-#define YCRED(x) x
-#else
-#define YCRED(x) (x->cred)
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-                       dev_t rdev)
-#else
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
-                       int rdev)
-#endif
-{
-       struct inode *inode;
-
-       yaffs_Object *obj = NULL;
-       yaffs_Device *dev;
-
-       yaffs_Object *parent = yaffs_InodeToObject(dir);
-
-       int error = -ENOSPC;
-       uid_t uid = YCRED(current)->fsuid;
-       gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
-
-       if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
-               mode |= S_ISGID;
-
-       if (parent) {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_mknod: parent object %d type %d\n",
-                       parent->objectId, parent->variantType));
-       } else {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_mknod: could not get parent object\n"));
-               return -EPERM;
-       }
-
-       T(YAFFS_TRACE_OS, ("yaffs_mknod: making oject for %s, "
-                       "mode %x dev %x\n",
-                       dentry->d_name.name, mode, rdev));
-
-       dev = parent->myDev;
-
-       yaffs_GrossLock(dev);
-
-       switch (mode & S_IFMT) {
-       default:
-               /* Special (socket, fifo, device...) */
-               T(YAFFS_TRACE_OS, ("yaffs_mknod: making special\n"));
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-               obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
-                               gid, old_encode_dev(rdev));
-#else
-               obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
-                               gid, rdev);
-#endif
-               break;
-       case S_IFREG:           /* file          */
-               T(YAFFS_TRACE_OS, ("yaffs_mknod: making file\n"));
-               obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
-                               gid);
-               break;
-       case S_IFDIR:           /* directory */
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_mknod: making directory\n"));
-               obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
-                                       uid, gid);
-               break;
-       case S_IFLNK:           /* symlink */
-               T(YAFFS_TRACE_OS, ("yaffs_mknod: making symlink\n"));
-               obj = NULL;     /* Do we ever get here? */
-               break;
-       }
-
-       /* Can not call yaffs_get_inode() with gross lock held */
-       yaffs_GrossUnlock(dev);
-
-       if (obj) {
-               inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
-               d_instantiate(dentry, inode);
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_mknod created object %d count = %d\n",
-                       obj->objectId, atomic_read(&inode->i_count)));
-               error = 0;
-       } else {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_mknod failed making object\n"));
-               error = -ENOMEM;
-       }
-
-       return error;
-}
-
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-{
-       int retVal;
-       T(YAFFS_TRACE_OS, ("yaffs_mkdir\n"));
-       retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
-       return retVal;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
-                       struct nameidata *n)
-#else
-static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
-#endif
-{
-       T(YAFFS_TRACE_OS, ("yaffs_create\n"));
-       return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
-}
-
-static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
-{
-       int retVal;
-
-       yaffs_Device *dev;
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_unlink %d:%s\n", (int)(dir->i_ino),
-               dentry->d_name.name));
-
-       dev = yaffs_InodeToObject(dir)->myDev;
-
-       yaffs_GrossLock(dev);
-
-       retVal = yaffs_Unlink(yaffs_InodeToObject(dir), dentry->d_name.name);
-
-       if (retVal == YAFFS_OK) {
-               dentry->d_inode->i_nlink--;
-               dir->i_version++;
-               yaffs_GrossUnlock(dev);
-               mark_inode_dirty(dentry->d_inode);
-               return 0;
-       }
-       yaffs_GrossUnlock(dev);
-       return -ENOTEMPTY;
-}
-
-/*
- * Create a link...
- */
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
-                       struct dentry *dentry)
-{
-       struct inode *inode = old_dentry->d_inode;
-       yaffs_Object *obj = NULL;
-       yaffs_Object *link = NULL;
-       yaffs_Device *dev;
-
-       T(YAFFS_TRACE_OS, ("yaffs_link\n"));
-
-       obj = yaffs_InodeToObject(inode);
-       dev = obj->myDev;
-
-       yaffs_GrossLock(dev);
-
-       if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
-               link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
-                       obj);
-
-       if (link) {
-               old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
-               d_instantiate(dentry, old_dentry->d_inode);
-               atomic_inc(&old_dentry->d_inode->i_count);
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_link link count %d i_count %d\n",
-                       old_dentry->d_inode->i_nlink,
-                       atomic_read(&old_dentry->d_inode->i_count)));
-       }
-
-       yaffs_GrossUnlock(dev);
-
-       if (link)
-               return 0;
-
-       return -EPERM;
-}
-
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
-                               const char *symname)
-{
-       yaffs_Object *obj;
-       yaffs_Device *dev;
-       uid_t uid = YCRED(current)->fsuid;
-       gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
-
-       T(YAFFS_TRACE_OS, ("yaffs_symlink\n"));
-
-       dev = yaffs_InodeToObject(dir)->myDev;
-       yaffs_GrossLock(dev);
-       obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
-                               S_IFLNK | S_IRWXUGO, uid, gid, symname);
-       yaffs_GrossUnlock(dev);
-
-       if (obj) {
-               struct inode *inode;
-
-               inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
-               d_instantiate(dentry, inode);
-               T(YAFFS_TRACE_OS, ("symlink created OK\n"));
-               return 0;
-       } else {
-               T(YAFFS_TRACE_OS, ("symlink not created\n"));
-       }
-
-       return -ENOMEM;
-}
-
-static int yaffs_sync_object(struct file *file, struct dentry *dentry,
-                               int datasync)
-{
-
-       yaffs_Object *obj;
-       yaffs_Device *dev;
-
-       obj = yaffs_DentryToObject(dentry);
-
-       dev = obj->myDev;
-
-       T(YAFFS_TRACE_OS, ("yaffs_sync_object\n"));
-       yaffs_GrossLock(dev);
-       yaffs_FlushFile(obj, 1);
-       yaffs_GrossUnlock(dev);
-       return 0;
-}
-
-/*
- * The VFS layer already does all the dentry stuff for rename.
- *
- * NB: POSIX says you can rename an object over an old object of the same name
- */
-static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
-                       struct inode *new_dir, struct dentry *new_dentry)
-{
-       yaffs_Device *dev;
-       int retVal = YAFFS_FAIL;
-       yaffs_Object *target;
-
-       T(YAFFS_TRACE_OS, ("yaffs_rename\n"));
-       dev = yaffs_InodeToObject(old_dir)->myDev;
-
-       yaffs_GrossLock(dev);
-
-       /* Check if the target is an existing directory that is not empty. */
-       target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
-                               new_dentry->d_name.name);
-
-
-
-       if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
-               !ylist_empty(&target->variant.directoryVariant.children)) {
-
-               T(YAFFS_TRACE_OS, ("target is non-empty dir\n"));
-
-               retVal = YAFFS_FAIL;
-       } else {
-               /* Now does unlinking internally using shadowing mechanism */
-               T(YAFFS_TRACE_OS, ("calling yaffs_RenameObject\n"));
-
-               retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
-                               old_dentry->d_name.name,
-                               yaffs_InodeToObject(new_dir),
-                               new_dentry->d_name.name);
-       }
-       yaffs_GrossUnlock(dev);
-
-       if (retVal == YAFFS_OK) {
-               if (target) {
-                       new_dentry->d_inode->i_nlink--;
-                       mark_inode_dirty(new_dentry->d_inode);
-               }
-
-               return 0;
-       } else {
-               return -ENOTEMPTY;
-       }
-}
-
-static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
-{
-       struct inode *inode = dentry->d_inode;
-       int error;
-       yaffs_Device *dev;
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_setattr of object %d\n",
-               yaffs_InodeToObject(inode)->objectId));
-
-       error = inode_change_ok(inode, attr);
-       if (error == 0) {
-               dev = yaffs_InodeToObject(inode)->myDev;
-               yaffs_GrossLock(dev);
-               if (yaffs_SetAttributes(yaffs_InodeToObject(inode), attr) ==
-                               YAFFS_OK) {
-                       error = 0;
-               } else {
-                       error = -EPERM;
-               }
-               yaffs_GrossUnlock(dev);
-               if (!error)
-                       error = inode_setattr(inode, attr);
-       }
-       return error;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
-       yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
-       struct super_block *sb = dentry->d_sb;
-#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
-{
-       yaffs_Device *dev = yaffs_SuperToDevice(sb);
-#else
-static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
-{
-       yaffs_Device *dev = yaffs_SuperToDevice(sb);
-#endif
-
-       T(YAFFS_TRACE_OS, ("yaffs_statfs\n"));
-
-       yaffs_GrossLock(dev);
-
-       buf->f_type = YAFFS_MAGIC;
-       buf->f_bsize = sb->s_blocksize;
-       buf->f_namelen = 255;
-
-       if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
-               /* Do this if chunk size is not a power of 2 */
-
-               uint64_t bytesInDev;
-               uint64_t bytesFree;
-
-               bytesInDev = ((uint64_t)((dev->endBlock - dev->startBlock + 1))) *
-                       ((uint64_t)(dev->nChunksPerBlock * dev->nDataBytesPerChunk));
-
-               do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
-               buf->f_blocks = bytesInDev;
-
-               bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
-                       ((uint64_t)(dev->nDataBytesPerChunk));
-
-               do_div(bytesFree, sb->s_blocksize);
-
-               buf->f_bfree = bytesFree;
-
-       } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
-
-               buf->f_blocks =
-                       (dev->endBlock - dev->startBlock + 1) *
-                       dev->nChunksPerBlock /
-                       (sb->s_blocksize / dev->nDataBytesPerChunk);
-               buf->f_bfree =
-                       yaffs_GetNumberOfFreeChunks(dev) /
-                       (sb->s_blocksize / dev->nDataBytesPerChunk);
-       } else {
-               buf->f_blocks =
-                       (dev->endBlock - dev->startBlock + 1) *
-                       dev->nChunksPerBlock *
-                       (dev->nDataBytesPerChunk / sb->s_blocksize);
-
-               buf->f_bfree =
-                       yaffs_GetNumberOfFreeChunks(dev) *
-                       (dev->nDataBytesPerChunk / sb->s_blocksize);
-       }
-
-       buf->f_files = 0;
-       buf->f_ffree = 0;
-       buf->f_bavail = buf->f_bfree;
-
-       yaffs_GrossUnlock(dev);
-       return 0;
-}
-
-
-static int yaffs_do_sync_fs(struct super_block *sb)
-{
-
-       yaffs_Device *dev = yaffs_SuperToDevice(sb);
-       T(YAFFS_TRACE_OS, ("yaffs_do_sync_fs\n"));
-
-       if (sb->s_dirt) {
-               yaffs_GrossLock(dev);
-
-               if (dev) {
-                       yaffs_FlushEntireDeviceCache(dev);
-                       yaffs_CheckpointSave(dev);
-               }
-
-               yaffs_GrossUnlock(dev);
-
-               sb->s_dirt = 0;
-       }
-       return 0;
-}
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static void yaffs_write_super(struct super_block *sb)
-#else
-static int yaffs_write_super(struct super_block *sb)
-#endif
-{
-
-       T(YAFFS_TRACE_OS, ("yaffs_write_super\n"));
-       if (yaffs_auto_checkpoint >= 2)
-               yaffs_do_sync_fs(sb);
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
-       return 0;
-#endif
-}
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_sync_fs(struct super_block *sb, int wait)
-#else
-static int yaffs_sync_fs(struct super_block *sb)
-#endif
-{
-       T(YAFFS_TRACE_OS, ("yaffs_sync_fs\n"));
-
-       if (yaffs_auto_checkpoint >= 1)
-               yaffs_do_sync_fs(sb);
-
-       return 0;
-}
-
-#ifdef YAFFS_USE_OWN_IGET
-
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
-{
-       struct inode *inode;
-       yaffs_Object *obj;
-       yaffs_Device *dev = yaffs_SuperToDevice(sb);
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_iget for %lu\n", ino));
-
-       inode = iget_locked(sb, ino);
-       if (!inode)
-               return ERR_PTR(-ENOMEM);
-       if (!(inode->i_state & I_NEW))
-               return inode;
-
-       /* NB This is called as a side effect of other functions, but
-        * we had to release the lock to prevent deadlocks, so
-        * need to lock again.
-        */
-
-       yaffs_GrossLock(dev);
-
-       obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
-
-       yaffs_FillInodeFromObject(inode, obj);
-
-       yaffs_GrossUnlock(dev);
-
-       unlock_new_inode(inode);
-       return inode;
-}
-
-#else
-
-static void yaffs_read_inode(struct inode *inode)
-{
-       /* NB This is called as a side effect of other functions, but
-        * we had to release the lock to prevent deadlocks, so
-        * need to lock again.
-        */
-
-       yaffs_Object *obj;
-       yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
-
-       T(YAFFS_TRACE_OS,
-               ("yaffs_read_inode for %d\n", (int)inode->i_ino));
-
-       yaffs_GrossLock(dev);
-
-       obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
-
-       yaffs_FillInodeFromObject(inode, obj);
-
-       yaffs_GrossUnlock(dev);
-}
-
-#endif
-
-static YLIST_HEAD(yaffs_dev_list);
-
-#if 0 /* not used */
-static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
-       yaffs_Device    *dev = yaffs_SuperToDevice(sb);
-
-       if (*flags & MS_RDONLY) {
-               struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
-
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_remount_fs: %s: RO\n", dev->name));
-
-               yaffs_GrossLock(dev);
-
-               yaffs_FlushEntireDeviceCache(dev);
-
-               yaffs_CheckpointSave(dev);
-
-               if (mtd->sync)
-                       mtd->sync(mtd);
-
-               yaffs_GrossUnlock(dev);
-       } else {
-               T(YAFFS_TRACE_OS,
-                       ("yaffs_remount_fs: %s: RW\n", dev->name));
-       }
-
-       return 0;
-}
-#endif
-
-static void yaffs_put_super(struct super_block *sb)
-{
-       yaffs_Device *dev = yaffs_SuperToDevice(sb);
-
-       T(YAFFS_TRACE_OS, ("yaffs_put_super\n"));
-
-       yaffs_GrossLock(dev);
-
-       yaffs_FlushEntireDeviceCache(dev);
-
-       yaffs_CheckpointSave(dev);
-
-       if (dev->putSuperFunc)
-               dev->putSuperFunc(sb);
-
-       yaffs_Deinitialise(dev);
-
-       yaffs_GrossUnlock(dev);
-
-       /* we assume this is protected by lock_kernel() in mount/umount */
-       ylist_del(&dev->devList);
-
-       if (dev->spareBuffer) {
-               YFREE(dev->spareBuffer);
-               dev->spareBuffer = NULL;
-       }
-
-       kfree(dev);
-}
-
-
-static void yaffs_MTDPutSuper(struct super_block *sb)
-{
-       struct mtd_info *mtd = yaffs_SuperToDevice(sb)->genericDevice;
-
-       if (mtd->sync)
-               mtd->sync(mtd);
-
-       put_mtd_device(mtd);
-}
-
-
-static void yaffs_MarkSuperBlockDirty(void *vsb)
-{
-       struct super_block *sb = (struct super_block *)vsb;
-
-       T(YAFFS_TRACE_OS, ("yaffs_MarkSuperBlockDirty() sb = %p\n", sb));
-       if (sb)
-               sb->s_dirt = 1;
-}
-
-typedef struct {
-       int inband_tags;
-       int skip_checkpoint_read;
-       int skip_checkpoint_write;
-       int no_cache;
-} yaffs_options;
-
-#define MAX_OPT_LEN 20
-static int yaffs_parse_options(yaffs_options *options, const char *options_str)
-{
-       char cur_opt[MAX_OPT_LEN + 1];
-       int p;
-       int error = 0;
-
-       /* Parse through the options which is a comma seperated list */
-
-       while (options_str && *options_str && !error) {
-               memset(cur_opt, 0, MAX_OPT_LEN + 1);
-               p = 0;
-
-               while (*options_str && *options_str != ',') {
-                       if (p < MAX_OPT_LEN) {
-                               cur_opt[p] = *options_str;
-                               p++;
-                       }
-                       options_str++;
-               }
-
-               if (!strcmp(cur_opt, "inband-tags"))
-                       options->inband_tags = 1;
-               else if (!strcmp(cur_opt, "no-cache"))
-                       options->no_cache = 1;
-               else if (!strcmp(cur_opt, "no-checkpoint-read"))
-                       options->skip_checkpoint_read = 1;
-               else if (!strcmp(cur_opt, "no-checkpoint-write"))
-                       options->skip_checkpoint_write = 1;
-               else if (!strcmp(cur_opt, "no-checkpoint")) {
-                       options->skip_checkpoint_read = 1;
-                       options->skip_checkpoint_write = 1;
-               } else {
-                       printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
-                                       cur_opt);
-                       error = 1;
-               }
-       }
-
-       return error;
-}
-
-static struct super_block *yaffs_internal_read_super(int yaffsVersion,
-                                               struct super_block *sb,
-                                               void *data, int silent)
-{
-       int nBlocks;
-       struct inode *inode = NULL;
-       struct dentry *root;
-       yaffs_Device *dev = 0;
-       char devname_buf[BDEVNAME_SIZE + 1];
-       struct mtd_info *mtd;
-       int err;
-       char *data_str = (char *)data;
-
-       yaffs_options options;
-
-       sb->s_magic = YAFFS_MAGIC;
-       sb->s_op = &yaffs_super_ops;
-       sb->s_flags |= MS_NOATIME;
-
-       if (!sb)
-               printk(KERN_INFO "yaffs: sb is NULL\n");
-       else if (!sb->s_dev)
-               printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
-       else if (!yaffs_devname(sb, devname_buf))
-               printk(KERN_INFO "yaffs: devname is NULL\n");
-       else
-               printk(KERN_INFO "yaffs: dev is %d name is \"%s\"\n",
-                      sb->s_dev,
-                      yaffs_devname(sb, devname_buf));
-
-       if (!data_str)
-               data_str = "";
-
-       printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
-
-       memset(&options, 0, sizeof(options));
-
-       if (yaffs_parse_options(&options, data_str)) {
-               /* Option parsing failed */
-               return NULL;
-       }
-
-
-       sb->s_blocksize = PAGE_CACHE_SIZE;
-       sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
-       T(YAFFS_TRACE_OS, ("yaffs_read_super: Using yaffs%d\n", yaffsVersion));
-       T(YAFFS_TRACE_OS,
-         ("yaffs_read_super: block size %d\n", (int)(sb->s_blocksize)));
-
-#ifdef CONFIG_YAFFS_DISABLE_WRITE_VERIFY
-       T(YAFFS_TRACE_OS,
-         ("yaffs: Write verification disabled. All guarantees "
-          "null and void\n"));
-#endif
-
-       T(YAFFS_TRACE_ALWAYS, ("yaffs: Attempting MTD mount on %u.%u, "
-                              "\"%s\"\n",
-                              MAJOR(sb->s_dev), MINOR(sb->s_dev),
-                              yaffs_devname(sb, devname_buf)));
-
-       /* Check it's an mtd device..... */
-       if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
-               return NULL;    /* This isn't an mtd device */
-
-       /* Get the device */
-       mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
-       if (!mtd) {
-               T(YAFFS_TRACE_ALWAYS,
-                 ("yaffs: MTD device #%u doesn't appear to exist\n",
-                  MINOR(sb->s_dev)));
-               return NULL;
-       }
-       /* Check it's NAND */
-       if (mtd->type != MTD_NANDFLASH) {
-               T(YAFFS_TRACE_ALWAYS,
-                 ("yaffs: MTD device is not NAND it's type %d\n", mtd->type));
-               return NULL;
-       }
-
-       T(YAFFS_TRACE_OS, (" erase %p\n", mtd->erase));
-       T(YAFFS_TRACE_OS, (" read %p\n", mtd->read));
-       T(YAFFS_TRACE_OS, (" write %p\n", mtd->write));
-       T(YAFFS_TRACE_OS, (" readoob %p\n", mtd->read_oob));
-       T(YAFFS_TRACE_OS, (" writeoob %p\n", mtd->write_oob));
-       T(YAFFS_TRACE_OS, (" block_isbad %p\n", mtd->block_isbad));
-       T(YAFFS_TRACE_OS, (" block_markbad %p\n", mtd->block_markbad));
-       T(YAFFS_TRACE_OS, (" %s %d\n", WRITE_SIZE_STR, WRITE_SIZE(mtd)));
-       T(YAFFS_TRACE_OS, (" oobsize %d\n", mtd->oobsize));
-       T(YAFFS_TRACE_OS, (" erasesize %d\n", mtd->erasesize));
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
-       T(YAFFS_TRACE_OS, (" size %u\n", mtd->size));
-#else
-       T(YAFFS_TRACE_OS, (" size %lld\n", mtd->size));
-#endif
-
-#ifdef CONFIG_YAFFS_AUTO_YAFFS2
-
-       if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
-               T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs2\n"));
-               yaffsVersion = 2;
-       }
-
-       /* Added NCB 26/5/2006 for completeness */
-       if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
-               T(YAFFS_TRACE_ALWAYS, ("yaffs: auto selecting yaffs1\n"));
-               yaffsVersion = 1;
-       }
-
-#endif
-
-       if (yaffsVersion == 2) {
-               /* Check for version 2 style functions */
-               if (!mtd->erase ||
-                   !mtd->block_isbad ||
-                   !mtd->block_markbad ||
-                   !mtd->read ||
-                   !mtd->write ||
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-                   !mtd->read_oob || !mtd->write_oob) {
-#else
-                   !mtd->write_ecc ||
-                   !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
-#endif
-                       T(YAFFS_TRACE_ALWAYS,
-                         ("yaffs: MTD device does not support required "
-                          "functions\n"));;
-                       return NULL;
-               }
-
-               if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
-                   mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
-                   !options.inband_tags) {
-                       T(YAFFS_TRACE_ALWAYS,
-                         ("yaffs: MTD device does not have the "
-                          "right page sizes\n"));
-                       return NULL;
-               }
-       } else {
-               /* Check for V1 style functions */
-               if (!mtd->erase ||
-                   !mtd->read ||
-                   !mtd->write ||
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-                   !mtd->read_oob || !mtd->write_oob) {
-#else
-                   !mtd->write_ecc ||
-                   !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
-#endif
-                       T(YAFFS_TRACE_ALWAYS,
-                         ("yaffs: MTD device does not support required "
-                          "functions\n"));;
-                       return NULL;
-               }
-
-               if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
-                   mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
-                       T(YAFFS_TRACE_ALWAYS,
-                         ("yaffs: MTD device does not support have the "
-                          "right page sizes\n"));
-                       return NULL;
-               }
-       }
-
-       /* OK, so if we got here, we have an MTD that's NAND and looks
-        * like it has the right capabilities
-        * Set the yaffs_Device up for mtd
-        */
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-       sb->s_fs_info = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
-#else
-       sb->u.generic_sbp = dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
-#endif
-       if (!dev) {
-               /* Deep shit could not allocate device structure */
-               T(YAFFS_TRACE_ALWAYS,
-                 ("yaffs_read_super: Failed trying to allocate "
-                  "yaffs_Device. \n"));
-               return NULL;
-       }
-
-       memset(dev, 0, sizeof(yaffs_Device));
-       dev->genericDevice = mtd;
-       dev->name = mtd->name;
-
-       /* Set up the memory size parameters.... */
-
-       nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
-
-       dev->startBlock = 0;
-       dev->endBlock = nBlocks - 1;
-       dev->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
-       dev->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
-       dev->nReservedBlocks = 5;
-       dev->nShortOpCaches = (options.no_cache) ? 0 : 10;
-       dev->inbandTags = options.inband_tags;
-
-       /* ... and the functions. */
-       if (yaffsVersion == 2) {
-               dev->writeChunkWithTagsToNAND =
-                   nandmtd2_WriteChunkWithTagsToNAND;
-               dev->readChunkWithTagsFromNAND =
-                   nandmtd2_ReadChunkWithTagsFromNAND;
-               dev->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
-               dev->queryNANDBlock = nandmtd2_QueryNANDBlock;
-               dev->spareBuffer = YMALLOC(mtd->oobsize);
-               dev->isYaffs2 = 1;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-               dev->totalBytesPerChunk = mtd->writesize;
-               dev->nChunksPerBlock = mtd->erasesize / mtd->writesize;
-#else
-               dev->totalBytesPerChunk = mtd->oobblock;
-               dev->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
-#endif
-               nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
-
-               dev->startBlock = 0;
-               dev->endBlock = nBlocks - 1;
-       } else {
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-               /* use the MTD interface in yaffs_mtdif1.c */
-               dev->writeChunkWithTagsToNAND =
-                       nandmtd1_WriteChunkWithTagsToNAND;
-               dev->readChunkWithTagsFromNAND =
-                       nandmtd1_ReadChunkWithTagsFromNAND;
-               dev->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
-               dev->queryNANDBlock = nandmtd1_QueryNANDBlock;
-#else
-               dev->writeChunkToNAND = nandmtd_WriteChunkToNAND;
-               dev->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
-#endif
-               dev->isYaffs2 = 0;
-       }
-       /* ... and common functions */
-       dev->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
-       dev->initialiseNAND = nandmtd_InitialiseNAND;
-
-       dev->putSuperFunc = yaffs_MTDPutSuper;
-
-       dev->superBlock = (void *)sb;
-       dev->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
-
-
-#ifndef CONFIG_YAFFS_DOES_ECC
-       dev->useNANDECC = 1;
-#endif
-
-#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
-       dev->wideTnodesDisabled = 1;
-#endif
-
-       dev->skipCheckpointRead = options.skip_checkpoint_read;
-       dev->skipCheckpointWrite = options.skip_checkpoint_write;
-
-       /* we assume this is protected by lock_kernel() in mount/umount */
-       ylist_add_tail(&dev->devList, &yaffs_dev_list);
-
-       init_MUTEX(&dev->grossLock);
-
-       yaffs_GrossLock(dev);
-
-       err = yaffs_GutsInitialise(dev);
-
-       T(YAFFS_TRACE_OS,
-         ("yaffs_read_super: guts initialised %s\n",
-          (err == YAFFS_OK) ? "OK" : "FAILED"));
-
-       /* Release lock before yaffs_get_inode() */
-       yaffs_GrossUnlock(dev);
-
-       /* Create root inode */
-       if (err == YAFFS_OK)
-               inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
-                                       yaffs_Root(dev));
-
-       if (!inode)
-               return NULL;
-
-       inode->i_op = &yaffs_dir_inode_operations;
-       inode->i_fop = &yaffs_dir_operations;
-
-       T(YAFFS_TRACE_OS, ("yaffs_read_super: got root inode\n"));
-
-       root = d_alloc_root(inode);
-
-       T(YAFFS_TRACE_OS, ("yaffs_read_super: d_alloc_root done\n"));
-
-       if (!root) {
-               iput(inode);
-               return NULL;
-       }
-       sb->s_root = root;
-       sb->s_dirt = !dev->isCheckpointed;
-       T(YAFFS_TRACE_ALWAYS,
-         ("yaffs_read_super: isCheckpointed %d\n", dev->isCheckpointed));
-
-       T(YAFFS_TRACE_OS, ("yaffs_read_super: done\n"));
-       return sb;
-}
-
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
-                                        int silent)
-{
-       return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs_read_super(struct file_system_type *fs,
-                           int flags, const char *dev_name,
-                           void *data, struct vfsmount *mnt)
-{
-
-       return get_sb_bdev(fs, flags, dev_name, data,
-                          yaffs_internal_read_super_mtd, mnt);
-}
-#else
-static struct super_block *yaffs_read_super(struct file_system_type *fs,
-                                           int flags, const char *dev_name,
-                                           void *data)
-{
-
-       return get_sb_bdev(fs, flags, dev_name, data,
-                          yaffs_internal_read_super_mtd);
-}
-#endif
-
-static struct file_system_type yaffs_fs_type = {
-       .owner = THIS_MODULE,
-       .name = "yaffs",
-       .get_sb = yaffs_read_super,
-       .kill_sb = kill_block_super,
-       .fs_flags = FS_REQUIRES_DEV,
-};
-#else
-static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
-                                           int silent)
-{
-       return yaffs_internal_read_super(1, sb, data, silent);
-}
-
-static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
-                     FS_REQUIRES_DEV);
-#endif
-
-
-#ifdef CONFIG_YAFFS_YAFFS2
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
-                                         int silent)
-{
-       return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
-}
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-static int yaffs2_read_super(struct file_system_type *fs,
-                       int flags, const char *dev_name, void *data,
-                       struct vfsmount *mnt)
-{
-       return get_sb_bdev(fs, flags, dev_name, data,
-                       yaffs2_internal_read_super_mtd, mnt);
-}
-#else
-static struct super_block *yaffs2_read_super(struct file_system_type *fs,
-                                            int flags, const char *dev_name,
-                                            void *data)
-{
-
-       return get_sb_bdev(fs, flags, dev_name, data,
-                          yaffs2_internal_read_super_mtd);
-}
-#endif
-
-static struct file_system_type yaffs2_fs_type = {
-       .owner = THIS_MODULE,
-       .name = "yaffs2",
-       .get_sb = yaffs2_read_super,
-       .kill_sb = kill_block_super,
-       .fs_flags = FS_REQUIRES_DEV,
-};
-#else
-static struct super_block *yaffs2_read_super(struct super_block *sb,
-                                            void *data, int silent)
-{
-       return yaffs_internal_read_super(2, sb, data, silent);
-}
-
-static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
-                     FS_REQUIRES_DEV);
-#endif
-
-#endif                         /* CONFIG_YAFFS_YAFFS2 */
-
-static struct proc_dir_entry *my_proc_entry;
-
-static char *yaffs_dump_dev(char *buf, yaffs_Device * dev)
-{
-       buf += sprintf(buf, "startBlock......... %d\n", dev->startBlock);
-       buf += sprintf(buf, "endBlock........... %d\n", dev->endBlock);
-       buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->totalBytesPerChunk);
-       buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
-       buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
-       buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
-       buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
-       buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->nReservedBlocks);
-       buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
-       buf += sprintf(buf, "nTnodesCreated..... %d\n", dev->nTnodesCreated);
-       buf += sprintf(buf, "nFreeTnodes........ %d\n", dev->nFreeTnodes);
-       buf += sprintf(buf, "nObjectsCreated.... %d\n", dev->nObjectsCreated);
-       buf += sprintf(buf, "nFreeObjects....... %d\n", dev->nFreeObjects);
-       buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
-       buf += sprintf(buf, "nPageWrites........ %d\n", dev->nPageWrites);
-       buf += sprintf(buf, "nPageReads......... %d\n", dev->nPageReads);
-       buf += sprintf(buf, "nBlockErasures..... %d\n", dev->nBlockErasures);
-       buf += sprintf(buf, "nGCCopies.......... %d\n", dev->nGCCopies);
-       buf += sprintf(buf, "garbageCollections. %d\n", dev->garbageCollections);
-       buf += sprintf(buf, "passiveGCs......... %d\n",
-                   dev->passiveGarbageCollections);
-       buf += sprintf(buf, "nRetriedWrites..... %d\n", dev->nRetriedWrites);
-       buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->nShortOpCaches);
-       buf += sprintf(buf, "nRetireBlocks...... %d\n", dev->nRetiredBlocks);
-       buf += sprintf(buf, "eccFixed........... %d\n", dev->eccFixed);
-       buf += sprintf(buf, "eccUnfixed......... %d\n", dev->eccUnfixed);
-       buf += sprintf(buf, "tagsEccFixed....... %d\n", dev->tagsEccFixed);
-       buf += sprintf(buf, "tagsEccUnfixed..... %d\n", dev->tagsEccUnfixed);
-       buf += sprintf(buf, "cacheHits.......... %d\n", dev->cacheHits);
-       buf += sprintf(buf, "nDeletedFiles...... %d\n", dev->nDeletedFiles);
-       buf += sprintf(buf, "nUnlinkedFiles..... %d\n", dev->nUnlinkedFiles);
-       buf +=
-           sprintf(buf, "nBackgroudDeletions %d\n", dev->nBackgroundDeletions);
-       buf += sprintf(buf, "useNANDECC......... %d\n", dev->useNANDECC);
-       buf += sprintf(buf, "isYaffs2........... %d\n", dev->isYaffs2);
-       buf += sprintf(buf, "inbandTags......... %d\n", dev->inbandTags);
-
-       return buf;
-}
-
-static int yaffs_proc_read(char *page,
-                          char **start,
-                          off_t offset, int count, int *eof, void *data)
-{
-       struct ylist_head *item;
-       char *buf = page;
-       int step = offset;
-       int n = 0;
-
-       /* Get proc_file_read() to step 'offset' by one on each sucessive call.
-        * We use 'offset' (*ppos) to indicate where we are in devList.
-        * This also assumes the user has posted a read buffer large
-        * enough to hold the complete output; but that's life in /proc.
-        */
-
-       *(int *)start = 1;
-
-       /* Print header first */
-       if (step == 0) {
-               buf += sprintf(buf, "YAFFS built:" __DATE__ " " __TIME__
-                              "\n%s\n%s\n", yaffs_fs_c_version,
-                              yaffs_guts_c_version);
-       }
-
-       /* hold lock_kernel while traversing yaffs_dev_list */
-       lock_kernel();
-
-       /* Locate and print the Nth entry.  Order N-squared but N is small. */
-       ylist_for_each(item, &yaffs_dev_list) {
-               yaffs_Device *dev = ylist_entry(item, yaffs_Device, devList);
-               if (n < step) {
-                       n++;
-                       continue;
-               }
-               buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->name);
-               buf = yaffs_dump_dev(buf, dev);
-               break;
-       }
-       unlock_kernel();
-
-       return buf - page < count ? buf - page : count;
-}
-
-/**
- * Set the verbosity of the warnings and error messages.
- *
- * Note that the names can only be a..z or _ with the current code.
- */
-
-static struct {
-       char *mask_name;
-       unsigned mask_bitfield;
-} mask_flags[] = {
-       {"allocate", YAFFS_TRACE_ALLOCATE},
-       {"always", YAFFS_TRACE_ALWAYS},
-       {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
-       {"buffers", YAFFS_TRACE_BUFFERS},
-       {"bug", YAFFS_TRACE_BUG},
-       {"checkpt", YAFFS_TRACE_CHECKPOINT},
-       {"deletion", YAFFS_TRACE_DELETION},
-       {"erase", YAFFS_TRACE_ERASE},
-       {"error", YAFFS_TRACE_ERROR},
-       {"gc_detail", YAFFS_TRACE_GC_DETAIL},
-       {"gc", YAFFS_TRACE_GC},
-       {"mtd", YAFFS_TRACE_MTD},
-       {"nandaccess", YAFFS_TRACE_NANDACCESS},
-       {"os", YAFFS_TRACE_OS},
-       {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
-       {"scan", YAFFS_TRACE_SCAN},
-       {"tracing", YAFFS_TRACE_TRACING},
-
-       {"verify", YAFFS_TRACE_VERIFY},
-       {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
-       {"verify_full", YAFFS_TRACE_VERIFY_FULL},
-       {"verify_all", YAFFS_TRACE_VERIFY_ALL},
-
-       {"write", YAFFS_TRACE_WRITE},
-       {"all", 0xffffffff},
-       {"none", 0},
-       {NULL, 0},
-};
-
-#define MAX_MASK_NAME_LENGTH 40
-static int yaffs_proc_write(struct file *file, const char *buf,
-                                        unsigned long count, void *data)
-{
-       unsigned rg = 0, mask_bitfield;
-       char *end;
-       char *mask_name;
-       const char *x;
-       char substring[MAX_MASK_NAME_LENGTH + 1];
-       int i;
-       int done = 0;
-       int add, len = 0;
-       int pos = 0;
-
-       rg = yaffs_traceMask;
-
-       while (!done && (pos < count)) {
-               done = 1;
-               while ((pos < count) && isspace(buf[pos]))
-                       pos++;
-
-               switch (buf[pos]) {
-               case '+':
-               case '-':
-               case '=':
-                       add = buf[pos];
-                       pos++;
-                       break;
-
-               default:
-                       add = ' ';
-                       break;
-               }
-               mask_name = NULL;
-
-               mask_bitfield = simple_strtoul(buf + pos, &end, 0);
-
-               if (end > buf + pos) {
-                       mask_name = "numeral";
-                       len = end - (buf + pos);
-                       pos += len;
-                       done = 0;
-               } else {
-                       for (x = buf + pos, i = 0;
-                           (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
-                           i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
-                               substring[i] = *x;
-                       substring[i] = '\0';
-
-                       for (i = 0; mask_flags[i].mask_name != NULL; i++) {
-                               if (strcmp(substring, mask_flags[i].mask_name) == 0) {
-                                       mask_name = mask_flags[i].mask_name;
-                                       mask_bitfield = mask_flags[i].mask_bitfield;
-                                       done = 0;
-                                       break;
-                               }
-                       }
-               }
-
-               if (mask_name != NULL) {
-                       done = 0;
-                       switch (add) {
-                       case '-':
-                               rg &= ~mask_bitfield;
-                               break;
-                       case '+':
-                               rg |= mask_bitfield;
-                               break;
-                       case '=':
-                               rg = mask_bitfield;
-                               break;
-                       default:
-                               rg |= mask_bitfield;
-                               break;
-                       }
-               }
-       }
-
-       yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
-
-       printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
-
-       if (rg & YAFFS_TRACE_ALWAYS) {
-               for (i = 0; mask_flags[i].mask_name != NULL; i++) {
-                       char flag;
-                       flag = ((rg & mask_flags[i].mask_bitfield) == mask_flags[i].mask_bitfield) ? '+' : '-';
-                       printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
-               }
-       }
-
-       return count;
-}
-
-/* Stuff to handle installation of file systems */
-struct file_system_to_install {
-       struct file_system_type *fst;
-       int installed;
-};
-
-static struct file_system_to_install fs_to_install[] = {
-       {&yaffs_fs_type, 0},
-       {&yaffs2_fs_type, 0},
-       {NULL, 0}
-};
-
-static int __init init_yaffs_fs(void)
-{
-       int error = 0;
-       struct file_system_to_install *fsinst;
-
-       T(YAFFS_TRACE_ALWAYS,
-         ("yaffs " __DATE__ " " __TIME__ " Installing. \n"));
-
-       /* Install the proc_fs entry */
-       my_proc_entry = create_proc_entry("yaffs",
-                                              S_IRUGO | S_IFREG,
-                                              YPROC_ROOT);
-
-       if (my_proc_entry) {
-               my_proc_entry->write_proc = yaffs_proc_write;
-               my_proc_entry->read_proc = yaffs_proc_read;
-               my_proc_entry->data = NULL;
-       } else
-               return -ENOMEM;
-
-       /* Now add the file system entries */
-
-       fsinst = fs_to_install;
-
-       while (fsinst->fst && !error) {
-               error = register_filesystem(fsinst->fst);
-               if (!error)
-                       fsinst->installed = 1;
-               fsinst++;
-       }
-
-       /* Any errors? uninstall  */
-       if (error) {
-               fsinst = fs_to_install;
-
-               while (fsinst->fst) {
-                       if (fsinst->installed) {
-                               unregister_filesystem(fsinst->fst);
-                               fsinst->installed = 0;
-                       }
-                       fsinst++;
-               }
-       }
-
-       return error;
-}
-
-static void __exit exit_yaffs_fs(void)
-{
-
-       struct file_system_to_install *fsinst;
-
-       T(YAFFS_TRACE_ALWAYS, ("yaffs " __DATE__ " " __TIME__
-                              " removing. \n"));
-
-       remove_proc_entry("yaffs", YPROC_ROOT);
-
-       fsinst = fs_to_install;
-
-       while (fsinst->fst) {
-               if (fsinst->installed) {
-                       unregister_filesystem(fsinst->fst);
-                       fsinst->installed = 0;
-               }
-               fsinst++;
-       }
-}
-
-module_init(init_yaffs_fs)
-module_exit(exit_yaffs_fs)
-
-MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
-MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2006");
-MODULE_LICENSE("GPL");
--- a/fs/yaffs2/yaffs_getblockinfo.h
+++ b/fs/yaffs2/yaffs_getblockinfo.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -17,6 +17,7 @@
 #define __YAFFS_GETBLOCKINFO_H__
 
 #include "yaffs_guts.h"
+#include "yaffs_trace.h"
 
 /* Function to manipulate block info */
 static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
--- a/fs/yaffs2/yaffs_guts.c
+++ b/fs/yaffs2/yaffs_guts.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -10,11 +10,8 @@
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
  */
-
-const char *yaffs_guts_c_version =
-    "$Id: yaffs_guts.c,v 1.82 2009-03-09 04:24:17 charles Exp $";
-
 #include "yportenv.h"
+#include "yaffs_trace.h"
 
 #include "yaffsinterface.h"
 #include "yaffs_guts.h"
@@ -22,22 +19,28 @@ const char *yaffs_guts_c_version =
 #include "yaffs_getblockinfo.h"
 
 #include "yaffs_tagscompat.h"
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-#include "yaffs_qsort.h"
-#endif
+
 #include "yaffs_nand.h"
 
-#include "yaffs_checkptrw.h"
+#include "yaffs_yaffs1.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_verify.h"
 
 #include "yaffs_nand.h"
 #include "yaffs_packedtags2.h"
 
+#include "yaffs_nameval.h"
+#include "yaffs_allocator.h"
 
-#define YAFFS_PASSIVE_GC_CHUNKS 2
+/* Note YAFFS_GC_GOOD_ENOUGH must be <= YAFFS_GC_PASSIVE_THRESHOLD */
+#define YAFFS_GC_GOOD_ENOUGH 2
+#define YAFFS_GC_PASSIVE_THRESHOLD 4
 
 #include "yaffs_ecc.h"
 
 
+
 /* Robustification (if it ever comes about...) */
 static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND);
 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
@@ -49,33 +52,26 @@ static void yaffs_HandleUpdateChunk(yaff
                                const yaffs_ExtendedTags *tags);
 
 /* Other local prototypes */
+static void yaffs_UpdateParent(yaffs_Object *obj);
 static int yaffs_UnlinkObject(yaffs_Object *obj);
 static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj);
 
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
-
 static int yaffs_WriteNewChunkWithTagsToNAND(yaffs_Device *dev,
                                        const __u8 *buffer,
                                        yaffs_ExtendedTags *tags,
                                        int useReserve);
-static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
-                               int chunkInNAND, int inScan);
+
 
 static yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
                                        yaffs_ObjectType type);
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
-                               yaffs_Object *obj);
-static int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
-                               int force, int isShrink, int shadows);
+
+
+static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod);
+
 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj);
 static int yaffs_CheckStructures(void);
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
-                       int chunkOffset, int *limit);
 static int yaffs_DoGenericObjectDeletion(yaffs_Object *in);
 
-static yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device *dev, int blockNo);
-
-
 static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
                                int chunkInNAND);
 
@@ -87,30 +83,22 @@ static int yaffs_TagsMatch(const yaffs_E
 static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
                                yaffs_BlockInfo **blockUsedPtr);
 
-static void yaffs_VerifyFreeChunks(yaffs_Device *dev);
-
 static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in);
 
-static void yaffs_VerifyDirectory(yaffs_Object *directory);
-#ifdef YAFFS_PARANOID
-static int yaffs_CheckFileSanity(yaffs_Object *in);
-#else
-#define yaffs_CheckFileSanity(in)
-#endif
-
 static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in);
 static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId);
 
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev);
-
 static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
                                yaffs_ExtendedTags *tags);
 
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
-               unsigned pos);
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
-                                       yaffs_FileStructure *fStruct,
-                                       __u32 chunkId);
+static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
+                                       int chunkInNAND,
+                                       const __u8 *data,
+                                       yaffs_ExtendedTags *tags);
+
+
+static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize);
+static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev,YCHAR *ohName, const YCHAR *name);
 
 
 /* Function to calculate chunk and offset */
@@ -172,7 +160,7 @@ static __u32 ShiftsGE(__u32 x)
 
 static __u32 Shifts(__u32 x)
 {
-       int nShifts;
+       __u32 nShifts;
 
        nShifts =  0;
 
@@ -203,7 +191,7 @@ static int yaffs_InitialiseTempBuffers(y
        for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
                dev->tempBuffer[i].line = 0;    /* not in use */
                dev->tempBuffer[i].buffer = buf =
-                   YMALLOC_DMA(dev->totalBytesPerChunk);
+                   YMALLOC_DMA(dev->param.totalBytesPerChunk);
        }
 
        return buf ? YAFFS_OK : YAFFS_FAIL;
@@ -286,7 +274,7 @@ int yaffs_IsManagedTempBuffer(yaffs_Devi
                        return 1;
        }
 
-       for (i = 0; i < dev->nShortOpCaches; i++) {
+       for (i = 0; i < dev->param.nShortOpCaches; i++) {
                if (dev->srCache[i].data == buffer)
                        return 1;
        }
@@ -299,6374 +287,4183 @@ int yaffs_IsManagedTempBuffer(yaffs_Devi
        return 0;
 }
 
-
-
 /*
- * Chunk bitmap manipulations
+ * Verification code
  */
 
-static Y_INLINE __u8 *yaffs_BlockBits(yaffs_Device *dev, int blk)
-{
-       if (blk < dev->internalStartBlock || blk > dev->internalEndBlock) {
-               T(YAFFS_TRACE_ERROR,
-                       (TSTR("**>> yaffs: BlockBits block %d is not valid" TENDSTR),
-                       blk));
-               YBUG();
-       }
-       return dev->chunkBits +
-               (dev->chunkBitmapStride * (blk - dev->internalStartBlock));
-}
 
-static Y_INLINE void yaffs_VerifyChunkBitId(yaffs_Device *dev, int blk, int chunk)
-{
-       if (blk < dev->internalStartBlock || blk > dev->internalEndBlock ||
-                       chunk < 0 || chunk >= dev->nChunksPerBlock) {
-               T(YAFFS_TRACE_ERROR,
-               (TSTR("**>> yaffs: Chunk Id (%d:%d) invalid"TENDSTR),
-                       blk, chunk));
-               YBUG();
-       }
-}
 
-static Y_INLINE void yaffs_ClearChunkBits(yaffs_Device *dev, int blk)
-{
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
 
-       memset(blkBits, 0, dev->chunkBitmapStride);
-}
+/*
+ *  Simple hash function. Needs to have a reasonable spread
+ */
 
-static Y_INLINE void yaffs_ClearChunkBit(yaffs_Device *dev, int blk, int chunk)
+static Y_INLINE int yaffs_HashFunction(int n)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-
-       yaffs_VerifyChunkBitId(dev, blk, chunk);
-
-       blkBits[chunk / 8] &= ~(1 << (chunk & 7));
+       n = abs(n);
+       return n % YAFFS_NOBJECT_BUCKETS;
 }
 
-static Y_INLINE void yaffs_SetChunkBit(yaffs_Device *dev, int blk, int chunk)
-{
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-
-       yaffs_VerifyChunkBitId(dev, blk, chunk);
-
-       blkBits[chunk / 8] |= (1 << (chunk & 7));
-}
+/*
+ * Access functions to useful fake objects.
+ * Note that root might have a presence in NAND if permissions are set.
+ */
 
-static Y_INLINE int yaffs_CheckChunkBit(yaffs_Device *dev, int blk, int chunk)
+yaffs_Object *yaffs_Root(yaffs_Device *dev)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-       yaffs_VerifyChunkBitId(dev, blk, chunk);
-
-       return (blkBits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
+       return dev->rootDir;
 }
 
-static Y_INLINE int yaffs_StillSomeChunkBits(yaffs_Device *dev, int blk)
+yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
 {
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-       int i;
-       for (i = 0; i < dev->chunkBitmapStride; i++) {
-               if (*blkBits)
-                       return 1;
-               blkBits++;
-       }
-       return 0;
+       return dev->lostNFoundDir;
 }
 
-static int yaffs_CountChunkBits(yaffs_Device *dev, int blk)
-{
-       __u8 *blkBits = yaffs_BlockBits(dev, blk);
-       int i;
-       int n = 0;
-       for (i = 0; i < dev->chunkBitmapStride; i++) {
-               __u8 x = *blkBits;
-               while (x) {
-                       if (x & 1)
-                               n++;
-                       x >>= 1;
-               }
-
-               blkBits++;
-       }
-       return n;
-}
 
 /*
- * Verification code
+ *  Erased NAND checking functions
  */
 
-static int yaffs_SkipVerification(yaffs_Device *dev)
-{
-       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipFullVerification(yaffs_Device *dev)
-{
-       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+int yaffs_CheckFF(__u8 *buffer, int nBytes)
 {
-       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+       /* Horrible, slow implementation */
+       while (nBytes--) {
+               if (*buffer != 0xFF)
+                       return 0;
+               buffer++;
+       }
+       return 1;
 }
 
-static const char *blockStateName[] = {
-"Unknown",
-"Needs scanning",
-"Scanning",
-"Empty",
-"Allocating",
-"Full",
-"Dirty",
-"Checkpoint",
-"Collecting",
-"Dead"
-};
-
-static void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
+static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
+                               int chunkInNAND)
 {
-       int actuallyUsed;
-       int inUse;
+       int retval = YAFFS_OK;
+       __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
+       yaffs_ExtendedTags tags;
+       int result;
 
-       if (yaffs_SkipVerification(dev))
-               return;
+       result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
 
-       /* Report illegal runtime states */
-       if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
+       if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
+               retval = YAFFS_FAIL;
 
-       switch (bi->blockState) {
-       case YAFFS_BLOCK_STATE_UNKNOWN:
-       case YAFFS_BLOCK_STATE_SCANNING:
-       case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
-               n, blockStateName[bi->blockState]));
+       if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
+               T(YAFFS_TRACE_NANDACCESS,
+                 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
+               retval = YAFFS_FAIL;
        }
 
-       /* Check pages in use and soft deletions are legal */
-
-       actuallyUsed = bi->pagesInUse - bi->softDeletions;
-
-       if (bi->pagesInUse < 0 || bi->pagesInUse > dev->nChunksPerBlock ||
-          bi->softDeletions < 0 || bi->softDeletions > dev->nChunksPerBlock ||
-          actuallyUsed < 0 || actuallyUsed > dev->nChunksPerBlock)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
-               n, bi->pagesInUse, bi->softDeletions));
-
+       yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 
-       /* Check chunk bitmap legal */
-       inUse = yaffs_CountChunkBits(dev, n);
-       if (inUse != bi->pagesInUse)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
-                       n, bi->pagesInUse, inUse));
+       return retval;
 
-       /* Check that the sequence number is valid.
-        * Ten million is legal, but is very unlikely
-        */
-       if (dev->isYaffs2 &&
-          (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING || bi->blockState == YAFFS_BLOCK_STATE_FULL) &&
-          (bi->sequenceNumber < YAFFS_LOWEST_SEQUENCE_NUMBER || bi->sequenceNumber > 10000000))
-               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has suspect sequence number of %d"TENDSTR),
-               n, bi->sequenceNumber));
 }
 
-static void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi,
-               int n)
+
+static int yaffs_VerifyChunkWritten(yaffs_Device *dev,
+                                       int chunkInNAND,
+                                       const __u8 *data,
+                                       yaffs_ExtendedTags *tags)
 {
-       yaffs_VerifyBlock(dev, bi, n);
+       int retval = YAFFS_OK;
+       yaffs_ExtendedTags tempTags;
+       __u8 *buffer = yaffs_GetTempBuffer(dev,__LINE__);
+       int result;
+       
+       result = yaffs_ReadChunkWithTagsFromNAND(dev,chunkInNAND,buffer,&tempTags);
+       if(memcmp(buffer,data,dev->nDataBytesPerChunk) ||
+               tempTags.objectId != tags->objectId ||
+               tempTags.chunkId  != tags->chunkId ||
+               tempTags.byteCount != tags->byteCount)
+               retval = YAFFS_FAIL;
 
-       /* After collection the block should be in the erased state */
-       /* This will need to change if we do partial gc */
+       yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 
-       if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
-                       bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
-               T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
-                       n, bi->blockState));
-       }
+       return retval;
 }
 
-static void yaffs_VerifyBlocks(yaffs_Device *dev)
+static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
+                                       const __u8 *data,
+                                       yaffs_ExtendedTags *tags,
+                                       int useReserve)
 {
-       int i;
-       int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
-       int nIllegalBlockStates = 0;
-
-       if (yaffs_SkipVerification(dev))
-               return;
-
-       memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
-
-       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-               yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
-               yaffs_VerifyBlock(dev, bi, i);
-
-               if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
-                       nBlocksPerState[bi->blockState]++;
-               else
-                       nIllegalBlockStates++;
-       }
+       int attempts = 0;
+       int writeOk = 0;
+       int chunk;
 
-       T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
-       T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
+       yaffs2_InvalidateCheckpoint(dev);
 
-       T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
-       if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
-               T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
+       do {
+               yaffs_BlockInfo *bi = 0;
+               int erasedOk = 0;
 
-       for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
-               T(YAFFS_TRACE_VERIFY,
-                 (TSTR("%s %d blocks"TENDSTR),
-                 blockStateName[i], nBlocksPerState[i]));
+               chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
+               if (chunk < 0) {
+                       /* no space */
+                       break;
+               }
 
-       if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
-               T(YAFFS_TRACE_VERIFY,
-                (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
-                dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
+               /* First check this chunk is erased, if it needs
+                * checking.  The checking policy (unless forced
+                * always on) is as follows:
+                *
+                * Check the first page we try to write in a block.
+                * If the check passes then we don't need to check any
+                * more.        If the check fails, we check again...
+                * If the block has been erased, we don't need to check.
+                *
+                * However, if the block has been prioritised for gc,
+                * then we think there might be something odd about
+                * this block and stop using it.
+                *
+                * Rationale: We should only ever see chunks that have
+                * not been erased if there was a partially written
+                * chunk due to power loss.  This checking policy should
+                * catch that case with very few checks and thus save a
+                * lot of checks that are most likely not needed.
+                *
+                * Mods to the above
+                * If an erase check fails or the write fails we skip the 
+                * rest of the block.
+                */
 
-       if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
-               T(YAFFS_TRACE_VERIFY,
-                (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
-                dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
+               /* let's give it a try */
+               attempts++;
 
-       if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
-               T(YAFFS_TRACE_VERIFY,
-                (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
-                nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
+               if(dev->param.alwaysCheckErased)
+                       bi->skipErasedCheck = 0;
 
-       T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
+               if (!bi->skipErasedCheck) {
+                       erasedOk = yaffs_CheckChunkErased(dev, chunk);
+                       if (erasedOk != YAFFS_OK) {
+                               T(YAFFS_TRACE_ERROR,
+                               (TSTR("**>> yaffs chunk %d was not erased"
+                               TENDSTR), chunk));
 
-}
+                               /* If not erased, delete this one,
+                                * skip rest of block and
+                                * try another chunk */
+                                yaffs_DeleteChunk(dev,chunk,1,__LINE__);
+                                yaffs_SkipRestOfBlock(dev);
+                               continue;
+                       }
+               }
 
-/*
- * Verify the object header. oh must be valid, but obj and tags may be NULL in which
- * case those tests will not be performed.
- */
-static void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
-{
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+               writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
+                               data, tags);
 
-       if (!(tags && obj && oh)) {
-               T(YAFFS_TRACE_VERIFY,
-                               (TSTR("Verifying object header tags %x obj %x oh %x"TENDSTR),
-                               (__u32)tags, (__u32)obj, (__u32)oh));
-               return;
-       }
+               if(!bi->skipErasedCheck)
+                       writeOk = yaffs_VerifyChunkWritten(dev, chunk, data, tags);
 
-       if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
-                       oh->type > YAFFS_OBJECT_TYPE_MAX)
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
-                       tags->objectId, oh->type));
+               if (writeOk != YAFFS_OK) {
+                       /* Clean up aborted write, skip to next block and
+                        * try another chunk */
+                       yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
+                       continue;
+               }
 
-       if (tags->objectId != obj->objectId)
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
-                       tags->objectId, obj->objectId));
+               bi->skipErasedCheck = 1;
 
+               /* Copy the data into the robustification buffer */
+               yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
 
-       /*
-        * Check that the object's parent ids match if parentCheck requested.
-        *
-        * Tests do not apply to the root object.
-        */
+       } while (writeOk != YAFFS_OK &&
+               (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
 
-       if (parentCheck && tags->objectId > 1 && !obj->parent)
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
-                       tags->objectId, oh->parentObjectId));
+       if (!writeOk)
+               chunk = -1;
 
-       if (parentCheck && obj->parent &&
-                       oh->parentObjectId != obj->parent->objectId &&
-                       (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
-                       obj->parent->objectId != YAFFS_OBJECTID_DELETED))
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
-                       tags->objectId, oh->parentObjectId, obj->parent->objectId));
+       if (attempts > 1) {
+               T(YAFFS_TRACE_ERROR,
+                       (TSTR("**>> yaffs write required %d attempts" TENDSTR),
+                       attempts));
 
-       if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header name is NULL"TENDSTR),
-                       obj->objectId));
+               dev->nRetriedWrites += (attempts - 1);
+       }
 
-       if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d header name is 0xFF"TENDSTR),
-                       obj->objectId));
+       return chunk;
 }
 
 
+ 
+/*
+ * Block retiring for handling a broken block.
+ */
 
-static int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
-                                       __u32 level, int chunkOffset)
+static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
 {
-       int i;
-       yaffs_Device *dev = obj->myDev;
-       int ok = 1;
+       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
 
-       if (tn) {
-               if (level > 0) {
+       yaffs2_InvalidateCheckpoint(dev);
+       
+       yaffs2_ClearOldestDirtySequence(dev,bi);
 
-                       for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
-                               if (tn->internal[i]) {
-                                       ok = yaffs_VerifyTnodeWorker(obj,
-                                                       tn->internal[i],
-                                                       level - 1,
-                                                       (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
-                               }
-                       }
-               } else if (level == 0) {
+       if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
+               if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
+                       T(YAFFS_TRACE_ALWAYS, (TSTR(
+                               "yaffs: Failed to mark bad and erase block %d"
+                               TENDSTR), blockInNAND));
+               } else {
                        yaffs_ExtendedTags tags;
-                       __u32 objectId = obj->objectId;
+                       int chunkId = blockInNAND * dev->param.nChunksPerBlock;
 
-                       chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
+                       __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 
-                       for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
-                               __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+                       memset(buffer, 0xff, dev->nDataBytesPerChunk);
+                       yaffs_InitialiseTags(&tags);
+                       tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
+                       if (dev->param.writeChunkWithTagsToNAND(dev, chunkId -
+                               dev->chunkOffset, buffer, &tags) != YAFFS_OK)
+                               T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
+                                       TCONT("write bad block marker to block %d")
+                                       TENDSTR), blockInNAND));
 
-                               if (theChunk > 0) {
-                                       /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
-                                       yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
-                                       if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
-                                               T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
-                                                       objectId, chunkOffset, theChunk,
-                                                       tags.objectId, tags.chunkId));
-                                       }
-                               }
-                               chunkOffset++;
-                       }
+                       yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
                }
        }
 
-       return ok;
+       bi->blockState = YAFFS_BLOCK_STATE_DEAD;
+       bi->gcPrioritise = 0;
+       bi->needsRetiring = 0;
 
+       dev->nRetiredBlocks++;
 }
 
+/*
+ * Functions for robustisizing TODO
+ *
+ */
 
-static void yaffs_VerifyFile(yaffs_Object *obj)
+static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
+                               const __u8 *data,
+                               const yaffs_ExtendedTags *tags)
 {
-       int requiredTallness;
-       int actualTallness;
-       __u32 lastChunk;
-       __u32 x;
-       __u32 i;
-       yaffs_Device *dev;
-       yaffs_ExtendedTags tags;
-       yaffs_Tnode *tn;
-       __u32 objectId;
+       dev=dev;
+       chunkInNAND=chunkInNAND;
+       data=data;
+       tags=tags;
+}
 
-       if (!obj)
-               return;
+static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
+                               const yaffs_ExtendedTags *tags)
+{
+       dev=dev;
+       chunkInNAND=chunkInNAND;
+       tags=tags;
+}
 
-       if (yaffs_SkipVerification(obj->myDev))
-               return;
+void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+       if (!bi->gcPrioritise) {
+               bi->gcPrioritise = 1;
+               dev->hasPendingPrioritisedGCs = 1;
+               bi->chunkErrorStrikes++;
 
-       dev = obj->myDev;
-       objectId = obj->objectId;
+               if (bi->chunkErrorStrikes > 3) {
+                       bi->needsRetiring = 1; /* Too many stikes, so retire this */
+                       T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
 
-       /* Check file size is consistent with tnode depth */
-       lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
-       x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
-       requiredTallness = 0;
-       while (x > 0) {
-               x >>= YAFFS_TNODES_INTERNAL_BITS;
-               requiredTallness++;
+               }
        }
+}
+
+static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
+               int erasedOk)
+{
+       int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
+       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
 
-       actualTallness = obj->variant.fileVariant.topLevel;
+       yaffs_HandleChunkError(dev, bi);
 
-       if (requiredTallness > actualTallness)
-               T(YAFFS_TRACE_VERIFY,
-               (TSTR("Obj %d had tnode tallness %d, needs to be %d"TENDSTR),
-                obj->objectId, actualTallness, requiredTallness));
+       if (erasedOk) {
+               /* Was an actual write failure, so mark the block for retirement  */
+               bi->needsRetiring = 1;
+               T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
+       }
+
+       /* Delete the chunk */
+       yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+       yaffs_SkipRestOfBlock(dev);
+}
 
 
-       /* Check that the chunks in the tnode tree are all correct.
-        * We do this by scanning through the tnode tree and
-        * checking the tags for every chunk match.
-        */
+/*---------------- Name handling functions ------------*/
 
-       if (yaffs_SkipNANDVerification(dev))
-               return;
+static __u16 yaffs_CalcNameSum(const YCHAR *name)
+{
+       __u16 sum = 0;
+       __u16 i = 1;
 
-       for (i = 1; i <= lastChunk; i++) {
-               tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
+       const YUCHAR *bname = (const YUCHAR *) name;
+       if (bname) {
+               while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
 
-               if (tn) {
-                       __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-                       if (theChunk > 0) {
-                               /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
-                               yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
-                               if (tags.objectId != objectId || tags.chunkId != i) {
-                                       T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
-                                               objectId, i, theChunk,
-                                               tags.objectId, tags.chunkId));
-                               }
-                       }
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+                       sum += yaffs_toupper(*bname) * i;
+#else
+                       sum += (*bname) * i;
+#endif
+                       i++;
+                       bname++;
                }
        }
+       return sum;
 }
 
-
-static void yaffs_VerifyHardLink(yaffs_Object *obj)
+void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
 {
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
+       memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
+       if (name && yaffs_strnlen(name,YAFFS_SHORT_NAME_LENGTH+1) <= YAFFS_SHORT_NAME_LENGTH)
+               yaffs_strcpy(obj->shortName, name);
+       else
+               obj->shortName[0] = _Y('\0');
+#endif
+       obj->sum = yaffs_CalcNameSum(name);
+}
 
-       /* Verify sane equivalent object */
+void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+       YCHAR tmpName[YAFFS_MAX_NAME_LENGTH+1];
+       memset(tmpName,0,sizeof(tmpName));
+       yaffs_LoadNameFromObjectHeader(obj->myDev,tmpName,oh->name,YAFFS_MAX_NAME_LENGTH+1);
+       yaffs_SetObjectName(obj,tmpName);
+#else
+       yaffs_SetObjectName(obj,oh->name);
+#endif
 }
 
-static void yaffs_VerifySymlink(yaffs_Object *obj)
+/*-------------------- TNODES -------------------
+
+ * List of spare tnodes
+ * The list is hooked together using the first pointer
+ * in the tnode.
+ */
+
+
+yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
 {
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+       yaffs_Tnode *tn = yaffs_AllocateRawTnode(dev);
+       if (tn){
+               memset(tn, 0, dev->tnodeSize);
+               dev->nTnodes++;
+       }
+
+       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 
-       /* Verify symlink string */
+       return tn;
 }
 
-static void yaffs_VerifySpecial(yaffs_Object *obj)
+/* FreeTnode frees up a tnode and puts it back on the free list */
+static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
 {
-       if (obj && yaffs_SkipVerification(obj->myDev))
-               return;
+       yaffs_FreeRawTnode(dev,tn);
+       dev->nTnodes--;
+       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 }
 
-static void yaffs_VerifyObject(yaffs_Object *obj)
+static void yaffs_DeinitialiseTnodesAndObjects(yaffs_Device *dev)
 {
-       yaffs_Device *dev;
-
-       __u32 chunkMin;
-       __u32 chunkMax;
-
-       __u32 chunkIdOk;
-       __u32 chunkInRange;
-       __u32 chunkShouldNotBeDeleted;
-       __u32 chunkValid;
-
-       if (!obj)
-               return;
+       yaffs_DeinitialiseRawTnodesAndObjects(dev);
+       dev->nObjects = 0;
+       dev->nTnodes = 0;
+}
 
-       if (obj->beingCreated)
-               return;
 
-       dev = obj->myDev;
+void yaffs_LoadLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
+               unsigned val)
+{
+       __u32 *map = (__u32 *)tn;
+       __u32 bitInMap;
+       __u32 bitInWord;
+       __u32 wordInMap;
+       __u32 mask;
 
-       if (yaffs_SkipVerification(dev))
-               return;
+       pos &= YAFFS_TNODES_LEVEL0_MASK;
+       val >>= dev->chunkGroupBits;
 
-       /* Check sane object header chunk */
+       bitInMap = pos * dev->tnodeWidth;
+       wordInMap = bitInMap / 32;
+       bitInWord = bitInMap & (32 - 1);
 
-       chunkMin = dev->internalStartBlock * dev->nChunksPerBlock;
-       chunkMax = (dev->internalEndBlock+1) * dev->nChunksPerBlock - 1;
+       mask = dev->tnodeMask << bitInWord;
 
-       chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
-       chunkIdOk = chunkInRange || obj->hdrChunk == 0;
-       chunkValid = chunkInRange &&
-                       yaffs_CheckChunkBit(dev,
-                                       obj->hdrChunk / dev->nChunksPerBlock,
-                                       obj->hdrChunk % dev->nChunksPerBlock);
-       chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
+       map[wordInMap] &= ~mask;
+       map[wordInMap] |= (mask & (val << bitInWord));
 
-       if (!obj->fake &&
-                       (!chunkIdOk || chunkShouldNotBeDeleted)) {
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
-                       obj->objectId, obj->hdrChunk,
-                       chunkIdOk ? "" : ",out of range",
-                       chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
+       if (dev->tnodeWidth > (32 - bitInWord)) {
+               bitInWord = (32 - bitInWord);
+               wordInMap++;;
+               mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
+               map[wordInMap] &= ~mask;
+               map[wordInMap] |= (mask & (val >> bitInWord));
        }
+}
 
-       if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
-               yaffs_ExtendedTags tags;
-               yaffs_ObjectHeader *oh;
-               __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-               oh = (yaffs_ObjectHeader *)buffer;
+__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
+               unsigned pos)
+{
+       __u32 *map = (__u32 *)tn;
+       __u32 bitInMap;
+       __u32 bitInWord;
+       __u32 wordInMap;
+       __u32 val;
 
-               yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
-                               &tags);
+       pos &= YAFFS_TNODES_LEVEL0_MASK;
 
-               yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
+       bitInMap = pos * dev->tnodeWidth;
+       wordInMap = bitInMap / 32;
+       bitInWord = bitInMap & (32 - 1);
 
-               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-       }
+       val = map[wordInMap] >> bitInWord;
 
-       /* Verify it has a parent */
-       if (obj && !obj->fake &&
-                       (!obj->parent || obj->parent->myDev != dev)) {
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
-                       obj->objectId, obj->parent));
+       if      (dev->tnodeWidth > (32 - bitInWord)) {
+               bitInWord = (32 - bitInWord);
+               wordInMap++;;
+               val |= (map[wordInMap] << bitInWord);
        }
 
-       /* Verify parent is a directory */
-       if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
-                       obj->objectId, obj->parent->variantType));
-       }
+       val &= dev->tnodeMask;
+       val <<= dev->chunkGroupBits;
 
-       switch (obj->variantType) {
-       case YAFFS_OBJECT_TYPE_FILE:
-               yaffs_VerifyFile(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SYMLINK:
-               yaffs_VerifySymlink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_DIRECTORY:
-               yaffs_VerifyDirectory(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_HARDLINK:
-               yaffs_VerifyHardLink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SPECIAL:
-               yaffs_VerifySpecial(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_UNKNOWN:
-       default:
-               T(YAFFS_TRACE_VERIFY,
-               (TSTR("Obj %d has illegaltype %d"TENDSTR),
-               obj->objectId, obj->variantType));
-               break;
-       }
+       return val;
 }
 
-static void yaffs_VerifyObjects(yaffs_Device *dev)
+/* ------------------- End of individual tnode manipulation -----------------*/
+
+/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
+ * The look up tree is represented by the top tnode and the number of topLevel
+ * in the tree. 0 means only the level 0 tnode is in the tree.
+ */
+
+/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
+yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
+                                       yaffs_FileStructure *fStruct,
+                                       __u32 chunkId)
 {
-       yaffs_Object *obj;
-       int i;
-       struct ylist_head *lh;
+       yaffs_Tnode *tn = fStruct->top;
+       __u32 i;
+       int requiredTallness;
+       int level = fStruct->topLevel;
 
-       if (yaffs_SkipVerification(dev))
-               return;
+       dev=dev;
 
-       /* Iterate through the objects in each hash entry */
+       /* Check sane level and chunk Id */
+       if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
+               return NULL;
 
-       for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
-               ylist_for_each(lh, &dev->objectBucket[i].list) {
-                       if (lh) {
-                               obj = ylist_entry(lh, yaffs_Object, hashLink);
-                               yaffs_VerifyObject(obj);
-                       }
-               }
+       if (chunkId > YAFFS_MAX_CHUNK_ID)
+               return NULL;
+
+       /* First check we're tall enough (ie enough topLevel) */
+
+       i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+       requiredTallness = 0;
+       while (i) {
+               i >>= YAFFS_TNODES_INTERNAL_BITS;
+               requiredTallness++;
        }
-}
 
+       if (requiredTallness > fStruct->topLevel)
+               return NULL; /* Not tall enough, so we can't find it */
 
-/*
- *  Simple hash function. Needs to have a reasonable spread
- */
+       /* Traverse down to level 0 */
+       while (level > 0 && tn) {
+               tn = tn->internal[(chunkId >>
+                       (YAFFS_TNODES_LEVEL0_BITS +
+                               (level - 1) *
+                               YAFFS_TNODES_INTERNAL_BITS)) &
+                       YAFFS_TNODES_INTERNAL_MASK];
+               level--;
+       }
 
-static Y_INLINE int yaffs_HashFunction(int n)
-{
-       n = abs(n);
-       return n % YAFFS_NOBJECT_BUCKETS;
+       return tn;
 }
 
-/*
- * Access functions to useful fake objects.
- * Note that root might have a presence in NAND if permissions are set.
+/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
+ * This happens in two steps:
+ *  1. If the tree isn't tall enough, then make it taller.
+ *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
+ *
+ * Used when modifying the tree.
+ *
+ *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
+ *  be plugged into the ttree.
  */
 
-yaffs_Object *yaffs_Root(yaffs_Device *dev)
+yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
+                                       yaffs_FileStructure *fStruct,
+                                       __u32 chunkId,
+                                       yaffs_Tnode *passedTn)
 {
-       return dev->rootDir;
-}
+       int requiredTallness;
+       int i;
+       int l;
+       yaffs_Tnode *tn;
 
-yaffs_Object *yaffs_LostNFound(yaffs_Device *dev)
-{
-       return dev->lostNFoundDir;
-}
+       __u32 x;
 
 
-/*
- *  Erased NAND checking functions
- */
+       /* Check sane level and page Id */
+       if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
+               return NULL;
 
-int yaffs_CheckFF(__u8 *buffer, int nBytes)
-{
-       /* Horrible, slow implementation */
-       while (nBytes--) {
-               if (*buffer != 0xFF)
-                       return 0;
-               buffer++;
-       }
-       return 1;
-}
-
-static int yaffs_CheckChunkErased(struct yaffs_DeviceStruct *dev,
-                               int chunkInNAND)
-{
-       int retval = YAFFS_OK;
-       __u8 *data = yaffs_GetTempBuffer(dev, __LINE__);
-       yaffs_ExtendedTags tags;
-       int result;
-
-       result = yaffs_ReadChunkWithTagsFromNAND(dev, chunkInNAND, data, &tags);
-
-       if (tags.eccResult > YAFFS_ECC_RESULT_NO_ERROR)
-               retval = YAFFS_FAIL;
-
-       if (!yaffs_CheckFF(data, dev->nDataBytesPerChunk) || tags.chunkUsed) {
-               T(YAFFS_TRACE_NANDACCESS,
-                 (TSTR("Chunk %d not erased" TENDSTR), chunkInNAND));
-               retval = YAFFS_FAIL;
-       }
-
-       yaffs_ReleaseTempBuffer(dev, data, __LINE__);
-
-       return retval;
-
-}
-
-static int yaffs_WriteNewChunkWithTagsToNAND(struct yaffs_DeviceStruct *dev,
-                                       const __u8 *data,
-                                       yaffs_ExtendedTags *tags,
-                                       int useReserve)
-{
-       int attempts = 0;
-       int writeOk = 0;
-       int chunk;
-
-       yaffs_InvalidateCheckpoint(dev);
-
-       do {
-               yaffs_BlockInfo *bi = 0;
-               int erasedOk = 0;
-
-               chunk = yaffs_AllocateChunk(dev, useReserve, &bi);
-               if (chunk < 0) {
-                       /* no space */
-                       break;
-               }
-
-               /* First check this chunk is erased, if it needs
-                * checking.  The checking policy (unless forced
-                * always on) is as follows:
-                *
-                * Check the first page we try to write in a block.
-                * If the check passes then we don't need to check any
-                * more.        If the check fails, we check again...
-                * If the block has been erased, we don't need to check.
-                *
-                * However, if the block has been prioritised for gc,
-                * then we think there might be something odd about
-                * this block and stop using it.
-                *
-                * Rationale: We should only ever see chunks that have
-                * not been erased if there was a partially written
-                * chunk due to power loss.  This checking policy should
-                * catch that case with very few checks and thus save a
-                * lot of checks that are most likely not needed.
-                */
-               if (bi->gcPrioritise) {
-                       yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
-                       /* try another chunk */
-                       continue;
-               }
-
-               /* let's give it a try */
-               attempts++;
-
-#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
-               bi->skipErasedCheck = 0;
-#endif
-               if (!bi->skipErasedCheck) {
-                       erasedOk = yaffs_CheckChunkErased(dev, chunk);
-                       if (erasedOk != YAFFS_OK) {
-                               T(YAFFS_TRACE_ERROR,
-                               (TSTR("**>> yaffs chunk %d was not erased"
-                               TENDSTR), chunk));
-
-                               /* try another chunk */
-                               continue;
-                       }
-                       bi->skipErasedCheck = 1;
-               }
-
-               writeOk = yaffs_WriteChunkWithTagsToNAND(dev, chunk,
-                               data, tags);
-               if (writeOk != YAFFS_OK) {
-                       yaffs_HandleWriteChunkError(dev, chunk, erasedOk);
-                       /* try another chunk */
-                       continue;
-               }
-
-               /* Copy the data into the robustification buffer */
-               yaffs_HandleWriteChunkOk(dev, chunk, data, tags);
-
-       } while (writeOk != YAFFS_OK &&
-               (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
-
-       if (!writeOk)
-               chunk = -1;
-
-       if (attempts > 1) {
-               T(YAFFS_TRACE_ERROR,
-                       (TSTR("**>> yaffs write required %d attempts" TENDSTR),
-                       attempts));
-
-               dev->nRetriedWrites += (attempts - 1);
-       }
-
-       return chunk;
-}
-
-/*
- * Block retiring for handling a broken block.
- */
-
-static void yaffs_RetireBlock(yaffs_Device *dev, int blockInNAND)
-{
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
-       yaffs_InvalidateCheckpoint(dev);
-
-       if (yaffs_MarkBlockBad(dev, blockInNAND) != YAFFS_OK) {
-               if (yaffs_EraseBlockInNAND(dev, blockInNAND) != YAFFS_OK) {
-                       T(YAFFS_TRACE_ALWAYS, (TSTR(
-                               "yaffs: Failed to mark bad and erase block %d"
-                               TENDSTR), blockInNAND));
-               } else {
-                       yaffs_ExtendedTags tags;
-                       int chunkId = blockInNAND * dev->nChunksPerBlock;
-
-                       __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-                       memset(buffer, 0xff, dev->nDataBytesPerChunk);
-                       yaffs_InitialiseTags(&tags);
-                       tags.sequenceNumber = YAFFS_SEQUENCE_BAD_BLOCK;
-                       if (dev->writeChunkWithTagsToNAND(dev, chunkId -
-                               dev->chunkOffset, buffer, &tags) != YAFFS_OK)
-                               T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Failed to "
-                                       TCONT("write bad block marker to block %d")
-                                       TENDSTR), blockInNAND));
-
-                       yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-               }
-       }
-
-       bi->blockState = YAFFS_BLOCK_STATE_DEAD;
-       bi->gcPrioritise = 0;
-       bi->needsRetiring = 0;
-
-       dev->nRetiredBlocks++;
-}
-
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_HandleWriteChunkOk(yaffs_Device *dev, int chunkInNAND,
-                               const __u8 *data,
-                               const yaffs_ExtendedTags *tags)
-{
-}
-
-static void yaffs_HandleUpdateChunk(yaffs_Device *dev, int chunkInNAND,
-                               const yaffs_ExtendedTags *tags)
-{
-}
-
-void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi)
-{
-       if (!bi->gcPrioritise) {
-               bi->gcPrioritise = 1;
-               dev->hasPendingPrioritisedGCs = 1;
-               bi->chunkErrorStrikes++;
-
-               if (bi->chunkErrorStrikes > 3) {
-                       bi->needsRetiring = 1; /* Too many stikes, so retire this */
-                       T(YAFFS_TRACE_ALWAYS, (TSTR("yaffs: Block struck out" TENDSTR)));
-
-               }
-       }
-}
-
-static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND,
-               int erasedOk)
-{
-       int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockInNAND);
-
-       yaffs_HandleChunkError(dev, bi);
-
-       if (erasedOk) {
-               /* Was an actual write failure, so mark the block for retirement  */
-               bi->needsRetiring = 1;
-               T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-                 (TSTR("**>> Block %d needs retiring" TENDSTR), blockInNAND));
-       }
-
-       /* Delete the chunk */
-       yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-}
-
-
-/*---------------- Name handling functions ------------*/
-
-static __u16 yaffs_CalcNameSum(const YCHAR *name)
-{
-       __u16 sum = 0;
-       __u16 i = 1;
-
-       const YUCHAR *bname = (const YUCHAR *) name;
-       if (bname) {
-               while ((*bname) && (i < (YAFFS_MAX_NAME_LENGTH/2))) {
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-                       sum += yaffs_toupper(*bname) * i;
-#else
-                       sum += (*bname) * i;
-#endif
-                       i++;
-                       bname++;
-               }
-       }
-       return sum;
-}
-
-static void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name)
-{
-#ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-       memset(obj->shortName, 0, sizeof(YCHAR) * (YAFFS_SHORT_NAME_LENGTH+1));
-       if (name && yaffs_strlen(name) <= YAFFS_SHORT_NAME_LENGTH)
-               yaffs_strcpy(obj->shortName, name);
-       else
-               obj->shortName[0] = _Y('\0');
-#endif
-       obj->sum = yaffs_CalcNameSum(name);
-}
-
-/*-------------------- TNODES -------------------
-
- * List of spare tnodes
- * The list is hooked together using the first pointer
- * in the tnode.
- */
-
-/* yaffs_CreateTnodes creates a bunch more tnodes and
- * adds them to the tnode free list.
- * Don't use this function directly
- */
-
-static int yaffs_CreateTnodes(yaffs_Device *dev, int nTnodes)
-{
-       int i;
-       int tnodeSize;
-       yaffs_Tnode *newTnodes;
-       __u8 *mem;
-       yaffs_Tnode *curr;
-       yaffs_Tnode *next;
-       yaffs_TnodeList *tnl;
-
-       if (nTnodes < 1)
-               return YAFFS_OK;
-
-       /* Calculate the tnode size in bytes for variable width tnode support.
-        * Must be a multiple of 32-bits  */
-       tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-       if (tnodeSize < sizeof(yaffs_Tnode))
-               tnodeSize = sizeof(yaffs_Tnode);
-
-       /* make these things */
-
-       newTnodes = YMALLOC(nTnodes * tnodeSize);
-       mem = (__u8 *)newTnodes;
-
-       if (!newTnodes) {
-               T(YAFFS_TRACE_ERROR,
-                       (TSTR("yaffs: Could not allocate Tnodes" TENDSTR)));
-               return YAFFS_FAIL;
-       }
-
-       /* Hook them into the free list */
-#if 0
-       for (i = 0; i < nTnodes - 1; i++) {
-               newTnodes[i].internal[0] = &newTnodes[i + 1];
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-               newTnodes[i].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-       }
-
-       newTnodes[nTnodes - 1].internal[0] = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-       newTnodes[nTnodes - 1].internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-       dev->freeTnodes = newTnodes;
-#else
-       /* New hookup for wide tnodes */
-       for (i = 0; i < nTnodes - 1; i++) {
-               curr = (yaffs_Tnode *) &mem[i * tnodeSize];
-               next = (yaffs_Tnode *) &mem[(i+1) * tnodeSize];
-               curr->internal[0] = next;
-       }
-
-       curr = (yaffs_Tnode *) &mem[(nTnodes - 1) * tnodeSize];
-       curr->internal[0] = dev->freeTnodes;
-       dev->freeTnodes = (yaffs_Tnode *)mem;
-
-#endif
-
-
-       dev->nFreeTnodes += nTnodes;
-       dev->nTnodesCreated += nTnodes;
-
-       /* Now add this bunch of tnodes to a list for freeing up.
-        * NB If we can't add this to the management list it isn't fatal
-        * but it just means we can't free this bunch of tnodes later.
-        */
-
-       tnl = YMALLOC(sizeof(yaffs_TnodeList));
-       if (!tnl) {
-               T(YAFFS_TRACE_ERROR,
-                 (TSTR
-                  ("yaffs: Could not add tnodes to management list" TENDSTR)));
-                  return YAFFS_FAIL;
-       } else {
-               tnl->tnodes = newTnodes;
-               tnl->next = dev->allocatedTnodeList;
-               dev->allocatedTnodeList = tnl;
-       }
-
-       T(YAFFS_TRACE_ALLOCATE, (TSTR("yaffs: Tnodes added" TENDSTR)));
-
-       return YAFFS_OK;
-}
-
-/* GetTnode gets us a clean tnode. Tries to make allocate more if we run out */
-
-static yaffs_Tnode *yaffs_GetTnodeRaw(yaffs_Device *dev)
-{
-       yaffs_Tnode *tn = NULL;
-
-       /* If there are none left make more */
-       if (!dev->freeTnodes)
-               yaffs_CreateTnodes(dev, YAFFS_ALLOCATION_NTNODES);
-
-       if (dev->freeTnodes) {
-               tn = dev->freeTnodes;
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-               if (tn->internal[YAFFS_NTNODES_INTERNAL] != (void *)1) {
-                       /* Hoosterman, this thing looks like it isn't in the list */
-                       T(YAFFS_TRACE_ALWAYS,
-                         (TSTR("yaffs: Tnode list bug 1" TENDSTR)));
-               }
-#endif
-               dev->freeTnodes = dev->freeTnodes->internal[0];
-               dev->nFreeTnodes--;
-       }
-
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-
-       return tn;
-}
-
-static yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev)
-{
-       yaffs_Tnode *tn = yaffs_GetTnodeRaw(dev);
-       int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-       if (tnodeSize < sizeof(yaffs_Tnode))
-               tnodeSize = sizeof(yaffs_Tnode);
-
-       if (tn)
-               memset(tn, 0, tnodeSize);
-
-       return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_FreeTnode(yaffs_Device *dev, yaffs_Tnode *tn)
-{
-       if (tn) {
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-               if (tn->internal[YAFFS_NTNODES_INTERNAL] != 0) {
-                       /* Hoosterman, this thing looks like it is already in the list */
-                       T(YAFFS_TRACE_ALWAYS,
-                         (TSTR("yaffs: Tnode list bug 2" TENDSTR)));
-               }
-               tn->internal[YAFFS_NTNODES_INTERNAL] = (void *)1;
-#endif
-               tn->internal[0] = dev->freeTnodes;
-               dev->freeTnodes = tn;
-               dev->nFreeTnodes++;
-       }
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-}
-
-static void yaffs_DeinitialiseTnodes(yaffs_Device *dev)
-{
-       /* Free the list of allocated tnodes */
-       yaffs_TnodeList *tmp;
-
-       while (dev->allocatedTnodeList) {
-               tmp = dev->allocatedTnodeList->next;
-
-               YFREE(dev->allocatedTnodeList->tnodes);
-               YFREE(dev->allocatedTnodeList);
-               dev->allocatedTnodeList = tmp;
-
-       }
-
-       dev->freeTnodes = NULL;
-       dev->nFreeTnodes = 0;
-}
-
-static void yaffs_InitialiseTnodes(yaffs_Device *dev)
-{
-       dev->allocatedTnodeList = NULL;
-       dev->freeTnodes = NULL;
-       dev->nFreeTnodes = 0;
-       dev->nTnodesCreated = 0;
-}
-
-
-void yaffs_PutLevel0Tnode(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos,
-               unsigned val)
-{
-       __u32 *map = (__u32 *)tn;
-       __u32 bitInMap;
-       __u32 bitInWord;
-       __u32 wordInMap;
-       __u32 mask;
-
-       pos &= YAFFS_TNODES_LEVEL0_MASK;
-       val >>= dev->chunkGroupBits;
-
-       bitInMap = pos * dev->tnodeWidth;
-       wordInMap = bitInMap / 32;
-       bitInWord = bitInMap & (32 - 1);
-
-       mask = dev->tnodeMask << bitInWord;
-
-       map[wordInMap] &= ~mask;
-       map[wordInMap] |= (mask & (val << bitInWord));
-
-       if (dev->tnodeWidth > (32 - bitInWord)) {
-               bitInWord = (32 - bitInWord);
-               wordInMap++;;
-               mask = dev->tnodeMask >> (/*dev->tnodeWidth -*/ bitInWord);
-               map[wordInMap] &= ~mask;
-               map[wordInMap] |= (mask & (val >> bitInWord));
-       }
-}
-
-static __u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn,
-               unsigned pos)
-{
-       __u32 *map = (__u32 *)tn;
-       __u32 bitInMap;
-       __u32 bitInWord;
-       __u32 wordInMap;
-       __u32 val;
-
-       pos &= YAFFS_TNODES_LEVEL0_MASK;
-
-       bitInMap = pos * dev->tnodeWidth;
-       wordInMap = bitInMap / 32;
-       bitInWord = bitInMap & (32 - 1);
-
-       val = map[wordInMap] >> bitInWord;
-
-       if      (dev->tnodeWidth > (32 - bitInWord)) {
-               bitInWord = (32 - bitInWord);
-               wordInMap++;;
-               val |= (map[wordInMap] << bitInWord);
-       }
-
-       val &= dev->tnodeMask;
-       val <<= dev->chunkGroupBits;
-
-       return val;
-}
-
-/* ------------------- End of individual tnode manipulation -----------------*/
-
-/* ---------Functions to manipulate the look-up tree (made up of tnodes) ------
- * The look up tree is represented by the top tnode and the number of topLevel
- * in the tree. 0 means only the level 0 tnode is in the tree.
- */
-
-/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-static yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
-                                       yaffs_FileStructure *fStruct,
-                                       __u32 chunkId)
-{
-       yaffs_Tnode *tn = fStruct->top;
-       __u32 i;
-       int requiredTallness;
-       int level = fStruct->topLevel;
-
-       /* Check sane level and chunk Id */
-       if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
-               return NULL;
-
-       if (chunkId > YAFFS_MAX_CHUNK_ID)
-               return NULL;
-
-       /* First check we're tall enough (ie enough topLevel) */
-
-       i = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-       requiredTallness = 0;
-       while (i) {
-               i >>= YAFFS_TNODES_INTERNAL_BITS;
-               requiredTallness++;
-       }
-
-       if (requiredTallness > fStruct->topLevel)
-               return NULL; /* Not tall enough, so we can't find it */
-
-       /* Traverse down to level 0 */
-       while (level > 0 && tn) {
-               tn = tn->internal[(chunkId >>
-                       (YAFFS_TNODES_LEVEL0_BITS +
-                               (level - 1) *
-                               YAFFS_TNODES_INTERNAL_BITS)) &
-                       YAFFS_TNODES_INTERNAL_MASK];
-               level--;
-       }
-
-       return tn;
-}
-
-/* AddOrFindLevel0Tnode finds the level 0 tnode if it exists, otherwise first expands the tree.
- * This happens in two steps:
- *  1. If the tree isn't tall enough, then make it taller.
- *  2. Scan down the tree towards the level 0 tnode adding tnodes if required.
- *
- * Used when modifying the tree.
- *
- *  If the tn argument is NULL, then a fresh tnode will be added otherwise the specified tn will
- *  be plugged into the ttree.
- */
-
-static yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
-                                       yaffs_FileStructure *fStruct,
-                                       __u32 chunkId,
-                                       yaffs_Tnode *passedTn)
-{
-       int requiredTallness;
-       int i;
-       int l;
-       yaffs_Tnode *tn;
-
-       __u32 x;
-
-
-       /* Check sane level and page Id */
-       if (fStruct->topLevel < 0 || fStruct->topLevel > YAFFS_TNODES_MAX_LEVEL)
-               return NULL;
-
-       if (chunkId > YAFFS_MAX_CHUNK_ID)
-               return NULL;
-
-       /* First check we're tall enough (ie enough topLevel) */
-
-       x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
-       requiredTallness = 0;
-       while (x) {
-               x >>= YAFFS_TNODES_INTERNAL_BITS;
-               requiredTallness++;
-       }
-
-
-       if (requiredTallness > fStruct->topLevel) {
-               /* Not tall enough, gotta make the tree taller */
-               for (i = fStruct->topLevel; i < requiredTallness; i++) {
-
-                       tn = yaffs_GetTnode(dev);
-
-                       if (tn) {
-                               tn->internal[0] = fStruct->top;
-                               fStruct->top = tn;
-                       } else {
-                               T(YAFFS_TRACE_ERROR,
-                                 (TSTR("yaffs: no more tnodes" TENDSTR)));
-                       }
-               }
-
-               fStruct->topLevel = requiredTallness;
-       }
-
-       /* Traverse down to level 0, adding anything we need */
-
-       l = fStruct->topLevel;
-       tn = fStruct->top;
-
-       if (l > 0) {
-               while (l > 0 && tn) {
-                       x = (chunkId >>
-                            (YAFFS_TNODES_LEVEL0_BITS +
-                             (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
-                           YAFFS_TNODES_INTERNAL_MASK;
-
-
-                       if ((l > 1) && !tn->internal[x]) {
-                               /* Add missing non-level-zero tnode */
-                               tn->internal[x] = yaffs_GetTnode(dev);
-
-                       } else if (l == 1) {
-                               /* Looking from level 1 at level 0 */
-                               if (passedTn) {
-                                       /* If we already have one, then release it.*/
-                                       if (tn->internal[x])
-                                               yaffs_FreeTnode(dev, tn->internal[x]);
-                                       tn->internal[x] = passedTn;
-
-                               } else if (!tn->internal[x]) {
-                                       /* Don't have one, none passed in */
-                                       tn->internal[x] = yaffs_GetTnode(dev);
-                               }
-                       }
-
-                       tn = tn->internal[x];
-                       l--;
-               }
-       } else {
-               /* top is level 0 */
-               if (passedTn) {
-                       memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
-                       yaffs_FreeTnode(dev, passedTn);
-               }
-       }
-
-       return tn;
-}
-
-static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
-                               yaffs_ExtendedTags *tags, int objectId,
-                               int chunkInInode)
-{
-       int j;
-
-       for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
-               if (yaffs_CheckChunkBit(dev, theChunk / dev->nChunksPerBlock,
-                               theChunk % dev->nChunksPerBlock)) {
-                       yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
-                                                       tags);
-                       if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
-                               /* found it; */
-                               return theChunk;
-                       }
-               }
-               theChunk++;
-       }
-       return -1;
-}
-
-
-/* DeleteWorker scans backwards through the tnode tree and deletes all the
- * chunks and tnodes in the file
- * Returns 1 if the tree was deleted.
- * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
- */
-
-static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
-                             int chunkOffset, int *limit)
-{
-       int i;
-       int chunkInInode;
-       int theChunk;
-       yaffs_ExtendedTags tags;
-       int foundChunk;
-       yaffs_Device *dev = in->myDev;
-
-       int allDone = 1;
-
-       if (tn) {
-               if (level > 0) {
-                       for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
-                            i--) {
-                               if (tn->internal[i]) {
-                                       if (limit && (*limit) < 0) {
-                                               allDone = 0;
-                                       } else {
-                                               allDone =
-                                                       yaffs_DeleteWorker(in,
-                                                               tn->
-                                                               internal
-                                                               [i],
-                                                               level -
-                                                               1,
-                                                               (chunkOffset
-                                                                       <<
-                                                                       YAFFS_TNODES_INTERNAL_BITS)
-                                                               + i,
-                                                               limit);
-                                       }
-                                       if (allDone) {
-                                               yaffs_FreeTnode(dev,
-                                                               tn->
-                                                               internal[i]);
-                                               tn->internal[i] = NULL;
-                                       }
-                               }
-                       }
-                       return (allDone) ? 1 : 0;
-               } else if (level == 0) {
-                       int hitLimit = 0;
-
-                       for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
-                                       i--) {
-                               theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-                               if (theChunk) {
-
-                                       chunkInInode = (chunkOffset <<
-                                               YAFFS_TNODES_LEVEL0_BITS) + i;
-
-                                       foundChunk =
-                                               yaffs_FindChunkInGroup(dev,
-                                                               theChunk,
-                                                               &tags,
-                                                               in->objectId,
-                                                               chunkInInode);
-
-                                       if (foundChunk > 0) {
-                                               yaffs_DeleteChunk(dev,
-                                                                 foundChunk, 1,
-                                                                 __LINE__);
-                                               in->nDataChunks--;
-                                               if (limit) {
-                                                       *limit = *limit - 1;
-                                                       if (*limit <= 0)
-                                                               hitLimit = 1;
-                                               }
-
-                                       }
-
-                                       yaffs_PutLevel0Tnode(dev, tn, i, 0);
-                               }
-
-                       }
-                       return (i < 0) ? 1 : 0;
-
-               }
-
-       }
-
-       return 1;
-
-}
-
-static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
-{
-       yaffs_BlockInfo *theBlock;
-
-       T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
-
-       theBlock = yaffs_GetBlockInfo(dev, chunk / dev->nChunksPerBlock);
-       if (theBlock) {
-               theBlock->softDeletions++;
-               dev->nFreeChunks++;
-       }
-}
-
-/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
- * All soft deleting does is increment the block's softdelete count and pulls the chunk out
- * of the tnode.
- * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
- */
-
-static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
-                                 __u32 level, int chunkOffset)
-{
-       int i;
-       int theChunk;
-       int allDone = 1;
-       yaffs_Device *dev = in->myDev;
-
-       if (tn) {
-               if (level > 0) {
-
-                       for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
-                            i--) {
-                               if (tn->internal[i]) {
-                                       allDone =
-                                           yaffs_SoftDeleteWorker(in,
-                                                                  tn->
-                                                                  internal[i],
-                                                                  level - 1,
-                                                                  (chunkOffset
-                                                                   <<
-                                                                   YAFFS_TNODES_INTERNAL_BITS)
-                                                                  + i);
-                                       if (allDone) {
-                                               yaffs_FreeTnode(dev,
-                                                               tn->
-                                                               internal[i]);
-                                               tn->internal[i] = NULL;
-                                       } else {
-                                               /* Hoosterman... how could this happen? */
-                                       }
-                               }
-                       }
-                       return (allDone) ? 1 : 0;
-               } else if (level == 0) {
-
-                       for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
-                               theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
-                               if (theChunk) {
-                                       /* Note this does not find the real chunk, only the chunk group.
-                                        * We make an assumption that a chunk group is not larger than
-                                        * a block.
-                                        */
-                                       yaffs_SoftDeleteChunk(dev, theChunk);
-                                       yaffs_PutLevel0Tnode(dev, tn, i, 0);
-                               }
-
-                       }
-                       return 1;
-
-               }
-
-       }
-
-       return 1;
-
-}
-
-static void yaffs_SoftDeleteFile(yaffs_Object *obj)
-{
-       if (obj->deleted &&
-           obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
-               if (obj->nDataChunks <= 0) {
-                       /* Empty file with no duplicate object headers, just delete it immediately */
-                       yaffs_FreeTnode(obj->myDev,
-                                       obj->variant.fileVariant.top);
-                       obj->variant.fileVariant.top = NULL;
-                       T(YAFFS_TRACE_TRACING,
-                         (TSTR("yaffs: Deleting empty file %d" TENDSTR),
-                          obj->objectId));
-                       yaffs_DoGenericObjectDeletion(obj);
-               } else {
-                       yaffs_SoftDeleteWorker(obj,
-                                              obj->variant.fileVariant.top,
-                                              obj->variant.fileVariant.
-                                              topLevel, 0);
-                       obj->softDeleted = 1;
-               }
-       }
-}
-
-/* Pruning removes any part of the file structure tree that is beyond the
- * bounds of the file (ie that does not point to chunks).
- *
- * A file should only get pruned when its size is reduced.
- *
- * Before pruning, the chunks must be pulled from the tree and the
- * level 0 tnode entries must be zeroed out.
- * Could also use this for file deletion, but that's probably better handled
- * by a special case.
- */
-
-static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
-                               __u32 level, int del0)
-{
-       int i;
-       int hasData;
-
-       if (tn) {
-               hasData = 0;
-
-               for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
-                       if (tn->internal[i] && level > 0) {
-                               tn->internal[i] =
-                                   yaffs_PruneWorker(dev, tn->internal[i],
-                                                     level - 1,
-                                                     (i == 0) ? del0 : 1);
-                       }
-
-                       if (tn->internal[i])
-                               hasData++;
-               }
-
-               if (hasData == 0 && del0) {
-                       /* Free and return NULL */
-
-                       yaffs_FreeTnode(dev, tn);
-                       tn = NULL;
-               }
-
-       }
-
-       return tn;
-
-}
-
-static int yaffs_PruneFileStructure(yaffs_Device *dev,
-                               yaffs_FileStructure *fStruct)
-{
-       int i;
-       int hasData;
-       int done = 0;
-       yaffs_Tnode *tn;
-
-       if (fStruct->topLevel > 0) {
-               fStruct->top =
-                   yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
-
-               /* Now we have a tree with all the non-zero branches NULL but the height
-                * is the same as it was.
-                * Let's see if we can trim internal tnodes to shorten the tree.
-                * We can do this if only the 0th element in the tnode is in use
-                * (ie all the non-zero are NULL)
-                */
-
-               while (fStruct->topLevel && !done) {
-                       tn = fStruct->top;
-
-                       hasData = 0;
-                       for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
-                               if (tn->internal[i])
-                                       hasData++;
-                       }
-
-                       if (!hasData) {
-                               fStruct->top = tn->internal[0];
-                               fStruct->topLevel--;
-                               yaffs_FreeTnode(dev, tn);
-                       } else {
-                               done = 1;
-                       }
-               }
-       }
-
-       return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* yaffs_CreateFreeObjects creates a bunch more objects and
- * adds them to the object free list.
- */
-static int yaffs_CreateFreeObjects(yaffs_Device *dev, int nObjects)
-{
-       int i;
-       yaffs_Object *newObjects;
-       yaffs_ObjectList *list;
-
-       if (nObjects < 1)
-               return YAFFS_OK;
-
-       /* make these things */
-       newObjects = YMALLOC(nObjects * sizeof(yaffs_Object));
-       list = YMALLOC(sizeof(yaffs_ObjectList));
-
-       if (!newObjects || !list) {
-               if (newObjects)
-                       YFREE(newObjects);
-               if (list)
-                       YFREE(list);
-               T(YAFFS_TRACE_ALLOCATE,
-                 (TSTR("yaffs: Could not allocate more objects" TENDSTR)));
-               return YAFFS_FAIL;
-       }
-
-       /* Hook them into the free list */
-       for (i = 0; i < nObjects - 1; i++) {
-               newObjects[i].siblings.next =
-                               (struct ylist_head *)(&newObjects[i + 1]);
-       }
-
-       newObjects[nObjects - 1].siblings.next = (void *)dev->freeObjects;
-       dev->freeObjects = newObjects;
-       dev->nFreeObjects += nObjects;
-       dev->nObjectsCreated += nObjects;
-
-       /* Now add this bunch of Objects to a list for freeing up. */
-
-       list->objects = newObjects;
-       list->next = dev->allocatedObjectList;
-       dev->allocatedObjectList = list;
-
-       return YAFFS_OK;
-}
-
-
-/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
-static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
-{
-       yaffs_Object *tn = NULL;
-
-#ifdef VALGRIND_TEST
-       tn = YMALLOC(sizeof(yaffs_Object));
-#else
-       /* If there are none left make more */
-       if (!dev->freeObjects)
-               yaffs_CreateFreeObjects(dev, YAFFS_ALLOCATION_NOBJECTS);
-
-       if (dev->freeObjects) {
-               tn = dev->freeObjects;
-               dev->freeObjects =
-                       (yaffs_Object *) (dev->freeObjects->siblings.next);
-               dev->nFreeObjects--;
-       }
-#endif
-       if (tn) {
-               /* Now sweeten it up... */
-
-               memset(tn, 0, sizeof(yaffs_Object));
-               tn->beingCreated = 1;
-
-               tn->myDev = dev;
-               tn->hdrChunk = 0;
-               tn->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
-               YINIT_LIST_HEAD(&(tn->hardLinks));
-               YINIT_LIST_HEAD(&(tn->hashLink));
-               YINIT_LIST_HEAD(&tn->siblings);
-
-
-               /* Now make the directory sane */
-               if (dev->rootDir) {
-                       tn->parent = dev->rootDir;
-                       ylist_add(&(tn->siblings), &dev->rootDir->variant.directoryVariant.children);
-               }
-
-               /* Add it to the lost and found directory.
-                * NB Can't put root or lostNFound in lostNFound so
-                * check if lostNFound exists first
-                */
-               if (dev->lostNFoundDir)
-                       yaffs_AddObjectToDirectory(dev->lostNFoundDir, tn);
-
-               tn->beingCreated = 0;
-       }
-
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-
-       return tn;
-}
-
-static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
-                                              __u32 mode)
-{
-
-       yaffs_Object *obj =
-           yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
-       if (obj) {
-               obj->fake = 1;          /* it is fake so it might have no NAND presence... */
-               obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
-               obj->unlinkAllowed = 0; /* ... or unlink it */
-               obj->deleted = 0;
-               obj->unlinked = 0;
-               obj->yst_mode = mode;
-               obj->myDev = dev;
-               obj->hdrChunk = 0;      /* Not a valid chunk. */
-       }
-
-       return obj;
-
-}
-
-static void yaffs_UnhashObject(yaffs_Object *tn)
-{
-       int bucket;
-       yaffs_Device *dev = tn->myDev;
-
-       /* If it is still linked into the bucket list, free from the list */
-       if (!ylist_empty(&tn->hashLink)) {
-               ylist_del_init(&tn->hashLink);
-               bucket = yaffs_HashFunction(tn->objectId);
-               dev->objectBucket[bucket].count--;
-       }
-}
-
-/*  FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_FreeObject(yaffs_Object *tn)
-{
-       yaffs_Device *dev = tn->myDev;
-
-#ifdef __KERNEL__
-       T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), tn, tn->myInode));
-#endif
-
-       if (tn->parent)
-               YBUG();
-       if (!ylist_empty(&tn->siblings))
-               YBUG();
-
-
-#ifdef __KERNEL__
-       if (tn->myInode) {
-               /* We're still hooked up to a cached inode.
-                * Don't delete now, but mark for later deletion
-                */
-               tn->deferedFree = 1;
-               return;
-       }
-#endif
-
-       yaffs_UnhashObject(tn);
-
-#ifdef VALGRIND_TEST
-       YFREE(tn);
-#else
-       /* Link into the free list. */
-       tn->siblings.next = (struct ylist_head *)(dev->freeObjects);
-       dev->freeObjects = tn;
-       dev->nFreeObjects++;
-#endif
-       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
-}
-
-#ifdef __KERNEL__
-
-void yaffs_HandleDeferedFree(yaffs_Object *obj)
-{
-       if (obj->deferedFree)
-               yaffs_FreeObject(obj);
-}
-
-#endif
-
-static void yaffs_DeinitialiseObjects(yaffs_Device *dev)
-{
-       /* Free the list of allocated Objects */
-
-       yaffs_ObjectList *tmp;
-
-       while (dev->allocatedObjectList) {
-               tmp = dev->allocatedObjectList->next;
-               YFREE(dev->allocatedObjectList->objects);
-               YFREE(dev->allocatedObjectList);
-
-               dev->allocatedObjectList = tmp;
-       }
-
-       dev->freeObjects = NULL;
-       dev->nFreeObjects = 0;
-}
-
-static void yaffs_InitialiseObjects(yaffs_Device *dev)
-{
-       int i;
-
-       dev->allocatedObjectList = NULL;
-       dev->freeObjects = NULL;
-       dev->nFreeObjects = 0;
-
-       for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
-               YINIT_LIST_HEAD(&dev->objectBucket[i].list);
-               dev->objectBucket[i].count = 0;
-       }
-}
-
-static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
-{
-       static int x;
-       int i;
-       int l = 999;
-       int lowest = 999999;
-
-       /* First let's see if we can find one that's empty. */
-
-       for (i = 0; i < 10 && lowest > 0; i++) {
-               x++;
-               x %= YAFFS_NOBJECT_BUCKETS;
-               if (dev->objectBucket[x].count < lowest) {
-                       lowest = dev->objectBucket[x].count;
-                       l = x;
-               }
-
-       }
-
-       /* If we didn't find an empty list, then try
-        * looking a bit further for a short one
-        */
-
-       for (i = 0; i < 10 && lowest > 3; i++) {
-               x++;
-               x %= YAFFS_NOBJECT_BUCKETS;
-               if (dev->objectBucket[x].count < lowest) {
-                       lowest = dev->objectBucket[x].count;
-                       l = x;
-               }
-
-       }
-
-       return l;
-}
-
-static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
-{
-       int bucket = yaffs_FindNiceObjectBucket(dev);
-
-       /* Now find an object value that has not already been taken
-        * by scanning the list.
-        */
-
-       int found = 0;
-       struct ylist_head *i;
-
-       __u32 n = (__u32) bucket;
-
-       /* yaffs_CheckObjectHashSanity();  */
-
-       while (!found) {
-               found = 1;
-               n += YAFFS_NOBJECT_BUCKETS;
-               if (1 || dev->objectBucket[bucket].count > 0) {
-                       ylist_for_each(i, &dev->objectBucket[bucket].list) {
-                               /* If there is already one in the list */
-                               if (i && ylist_entry(i, yaffs_Object,
-                                               hashLink)->objectId == n) {
-                                       found = 0;
-                               }
-                       }
-               }
-       }
-
-       return n;
-}
-
-static void yaffs_HashObject(yaffs_Object *in)
-{
-       int bucket = yaffs_HashFunction(in->objectId);
-       yaffs_Device *dev = in->myDev;
-
-       ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
-       dev->objectBucket[bucket].count++;
-}
-
-yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
-{
-       int bucket = yaffs_HashFunction(number);
-       struct ylist_head *i;
-       yaffs_Object *in;
-
-       ylist_for_each(i, &dev->objectBucket[bucket].list) {
-               /* Look if it is in the list */
-               if (i) {
-                       in = ylist_entry(i, yaffs_Object, hashLink);
-                       if (in->objectId == number) {
-#ifdef __KERNEL__
-                               /* Don't tell the VFS about this one if it is defered free */
-                               if (in->deferedFree)
-                                       return NULL;
-#endif
-
-                               return in;
-                       }
-               }
-       }
-
-       return NULL;
-}
-
-yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
-                                   yaffs_ObjectType type)
-{
-       yaffs_Object *theObject;
-       yaffs_Tnode *tn = NULL;
-
-       if (number < 0)
-               number = yaffs_CreateNewObjectNumber(dev);
-
-       theObject = yaffs_AllocateEmptyObject(dev);
-       if (!theObject)
-               return NULL;
-
-       if (type == YAFFS_OBJECT_TYPE_FILE) {
-               tn = yaffs_GetTnode(dev);
-               if (!tn) {
-                       yaffs_FreeObject(theObject);
-                       return NULL;
-               }
-       }
-
-       if (theObject) {
-               theObject->fake = 0;
-               theObject->renameAllowed = 1;
-               theObject->unlinkAllowed = 1;
-               theObject->objectId = number;
-               yaffs_HashObject(theObject);
-               theObject->variantType = type;
-#ifdef CONFIG_YAFFS_WINCE
-               yfsd_WinFileTimeNow(theObject->win_atime);
-               theObject->win_ctime[0] = theObject->win_mtime[0] =
-                   theObject->win_atime[0];
-               theObject->win_ctime[1] = theObject->win_mtime[1] =
-                   theObject->win_atime[1];
-
-#else
-
-               theObject->yst_atime = theObject->yst_mtime =
-                   theObject->yst_ctime = Y_CURRENT_TIME;
-#endif
-               switch (type) {
-               case YAFFS_OBJECT_TYPE_FILE:
-                       theObject->variant.fileVariant.fileSize = 0;
-                       theObject->variant.fileVariant.scannedFileSize = 0;
-                       theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
-                       theObject->variant.fileVariant.topLevel = 0;
-                       theObject->variant.fileVariant.top = tn;
-                       break;
-               case YAFFS_OBJECT_TYPE_DIRECTORY:
-                       YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
-                                       children);
-                       break;
-               case YAFFS_OBJECT_TYPE_SYMLINK:
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-                       /* No action required */
-                       break;
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-                       /* todo this should not happen */
-                       break;
-               }
-       }
-
-       return theObject;
-}
-
-static yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
-                                                     int number,
-                                                     yaffs_ObjectType type)
-{
-       yaffs_Object *theObject = NULL;
-
-       if (number > 0)
-               theObject = yaffs_FindObjectByNumber(dev, number);
-
-       if (!theObject)
-               theObject = yaffs_CreateNewObject(dev, number, type);
-
-       return theObject;
-
-}
-
-
-static YCHAR *yaffs_CloneString(const YCHAR *str)
-{
-       YCHAR *newStr = NULL;
-
-       if (str && *str) {
-               newStr = YMALLOC((yaffs_strlen(str) + 1) * sizeof(YCHAR));
-               if (newStr)
-                       yaffs_strcpy(newStr, str);
-       }
-
-       return newStr;
-
-}
-
-/*
- * Mknod (create) a new object.
- * equivalentObject only has meaning for a hard link;
- * aliasString only has meaning for a sumlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
-                                      yaffs_Object *parent,
-                                      const YCHAR *name,
-                                      __u32 mode,
-                                      __u32 uid,
-                                      __u32 gid,
-                                      yaffs_Object *equivalentObject,
-                                      const YCHAR *aliasString, __u32 rdev)
-{
-       yaffs_Object *in;
-       YCHAR *str = NULL;
-
-       yaffs_Device *dev = parent->myDev;
-
-       /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
-       if (yaffs_FindObjectByName(parent, name))
-               return NULL;
-
-       in = yaffs_CreateNewObject(dev, -1, type);
-
-       if (!in)
-               return YAFFS_FAIL;
-
-       if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
-               str = yaffs_CloneString(aliasString);
-               if (!str) {
-                       yaffs_FreeObject(in);
-                       return NULL;
-               }
-       }
-
-
-
-       if (in) {
-               in->hdrChunk = 0;
-               in->valid = 1;
-               in->variantType = type;
-
-               in->yst_mode = mode;
-
-#ifdef CONFIG_YAFFS_WINCE
-               yfsd_WinFileTimeNow(in->win_atime);
-               in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
-               in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
-
-#else
-               in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
-
-               in->yst_rdev = rdev;
-               in->yst_uid = uid;
-               in->yst_gid = gid;
-#endif
-               in->nDataChunks = 0;
-
-               yaffs_SetObjectName(in, name);
-               in->dirty = 1;
-
-               yaffs_AddObjectToDirectory(parent, in);
-
-               in->myDev = parent->myDev;
-
-               switch (type) {
-               case YAFFS_OBJECT_TYPE_SYMLINK:
-                       in->variant.symLinkVariant.alias = str;
-                       break;
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-                       in->variant.hardLinkVariant.equivalentObject =
-                               equivalentObject;
-                       in->variant.hardLinkVariant.equivalentObjectId =
-                               equivalentObject->objectId;
-                       ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
-                       break;
-               case YAFFS_OBJECT_TYPE_FILE:
-               case YAFFS_OBJECT_TYPE_DIRECTORY:
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-                       /* do nothing */
-                       break;
-               }
-
-               if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0) < 0) {
-                       /* Could not create the object header, fail the creation */
-                       yaffs_DeleteObject(in);
-                       in = NULL;
-               }
-
-       }
-
-       return in;
-}
-
-yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
-                       __u32 mode, __u32 uid, __u32 gid)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
-                               uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
-                               __u32 mode, __u32 uid, __u32 gid)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
-                                mode, uid, gid, NULL, NULL, 0);
-}
-
-yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
-                               __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
-                                uid, gid, NULL, NULL, rdev);
-}
-
-yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
-                               __u32 mode, __u32 uid, __u32 gid,
-                               const YCHAR *alias)
-{
-       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
-                               uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_Link returns the object id of the equivalent object.*/
-yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
-                       yaffs_Object *equivalentObject)
-{
-       /* Get the real object in case we were fed a hard link as an equivalent object */
-       equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
-
-       if (yaffs_MknodObject
-           (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
-            equivalentObject, NULL, 0)) {
-               return equivalentObject;
-       } else {
-               return NULL;
-       }
-
-}
-
-static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
-                               const YCHAR *newName, int force, int shadows)
-{
-       int unlinkOp;
-       int deleteOp;
-
-       yaffs_Object *existingTarget;
-
-       if (newDir == NULL)
-               newDir = obj->parent;   /* use the old directory */
-
-       if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-               T(YAFFS_TRACE_ALWAYS,
-                 (TSTR
-                  ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
-                   TENDSTR)));
-               YBUG();
-       }
-
-       /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
-       if (obj->myDev->isYaffs2)
-               unlinkOp = (newDir == obj->myDev->unlinkedDir);
-       else
-               unlinkOp = (newDir == obj->myDev->unlinkedDir
-                           && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
-
-       deleteOp = (newDir == obj->myDev->deletedDir);
-
-       existingTarget = yaffs_FindObjectByName(newDir, newName);
-
-       /* If the object is a file going into the unlinked directory,
-        *   then it is OK to just stuff it in since duplicate names are allowed.
-        *   else only proceed if the new name does not exist and if we're putting
-        *   it into a directory.
-        */
-       if ((unlinkOp ||
-            deleteOp ||
-            force ||
-            (shadows > 0) ||
-            !existingTarget) &&
-           newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
-               yaffs_SetObjectName(obj, newName);
-               obj->dirty = 1;
-
-               yaffs_AddObjectToDirectory(newDir, obj);
-
-               if (unlinkOp)
-                       obj->unlinked = 1;
-
-               /* If it is a deletion then we mark it as a shrink for gc purposes. */
-               if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows) >= 0)
-                       return YAFFS_OK;
-       }
-
-       return YAFFS_FAIL;
-}
-
-int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
-               yaffs_Object *newDir, const YCHAR *newName)
-{
-       yaffs_Object *obj = NULL;
-       yaffs_Object *existingTarget = NULL;
-       int force = 0;
-
-
-       if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-               YBUG();
-       if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
-               YBUG();
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
-       /* Special case for case insemsitive systems (eg. WinCE).
-        * While look-up is case insensitive, the name isn't.
-        * Therefore we might want to change x.txt to X.txt
-       */
-       if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
-               force = 1;
-#endif
-
-       else if (yaffs_strlen(newName) > YAFFS_MAX_NAME_LENGTH)
-               /* ENAMETOOLONG */
-               return YAFFS_FAIL;
-
-       obj = yaffs_FindObjectByName(oldDir, oldName);
-
-       if (obj && obj->renameAllowed) {
-
-               /* Now do the handling for an existing target, if there is one */
-
-               existingTarget = yaffs_FindObjectByName(newDir, newName);
-               if (existingTarget &&
-                       existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
-                       !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
-                       /* There is a target that is a non-empty directory, so we fail */
-                       return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
-               } else if (existingTarget && existingTarget != obj) {
-                       /* Nuke the target first, using shadowing,
-                        * but only if it isn't the same object
-                        */
-                       yaffs_ChangeObjectName(obj, newDir, newName, force,
-                                               existingTarget->objectId);
-                       yaffs_UnlinkObject(existingTarget);
-               }
-
-               return yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
-       }
-       return YAFFS_FAIL;
-}
-
-/*------------------------- Block Management and Page Allocation ----------------*/
-
-static int yaffs_InitialiseBlocks(yaffs_Device *dev)
-{
-       int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-
-       dev->blockInfo = NULL;
-       dev->chunkBits = NULL;
-
-       dev->allocationBlock = -1;      /* force it to get a new one */
-
-       /* If the first allocation strategy fails, thry the alternate one */
-       dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
-       if (!dev->blockInfo) {
-               dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
-               dev->blockInfoAlt = 1;
-       } else
-               dev->blockInfoAlt = 0;
-
-       if (dev->blockInfo) {
-               /* Set up dynamic blockinfo stuff. */
-               dev->chunkBitmapStride = (dev->nChunksPerBlock + 7) / 8; /* round up bytes */
-               dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
-               if (!dev->chunkBits) {
-                       dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
-                       dev->chunkBitsAlt = 1;
-               } else
-                       dev->chunkBitsAlt = 0;
-       }
-
-       if (dev->blockInfo && dev->chunkBits) {
-               memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
-               memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
-               return YAFFS_OK;
-       }
-
-       return YAFFS_FAIL;
-}
-
-static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
-{
-       if (dev->blockInfoAlt && dev->blockInfo)
-               YFREE_ALT(dev->blockInfo);
-       else if (dev->blockInfo)
-               YFREE(dev->blockInfo);
-
-       dev->blockInfoAlt = 0;
-
-       dev->blockInfo = NULL;
-
-       if (dev->chunkBitsAlt && dev->chunkBits)
-               YFREE_ALT(dev->chunkBits);
-       else if (dev->chunkBits)
-               YFREE(dev->chunkBits);
-       dev->chunkBitsAlt = 0;
-       dev->chunkBits = NULL;
-}
-
-static int yaffs_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
-                                       yaffs_BlockInfo *bi)
-{
-       int i;
-       __u32 seq;
-       yaffs_BlockInfo *b;
-
-       if (!dev->isYaffs2)
-               return 1;       /* disqualification only applies to yaffs2. */
-
-       if (!bi->hasShrinkHeader)
-               return 1;       /* can gc */
-
-       /* Find the oldest dirty sequence number if we don't know it and save it
-        * so we don't have to keep recomputing it.
-        */
-       if (!dev->oldestDirtySequence) {
-               seq = dev->sequenceNumber;
-
-               for (i = dev->internalStartBlock; i <= dev->internalEndBlock;
-                               i++) {
-                       b = yaffs_GetBlockInfo(dev, i);
-                       if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
-                           (b->pagesInUse - b->softDeletions) <
-                           dev->nChunksPerBlock && b->sequenceNumber < seq) {
-                               seq = b->sequenceNumber;
-                       }
-               }
-               dev->oldestDirtySequence = seq;
-       }
-
-       /* Can't do gc of this block if there are any blocks older than this one that have
-        * discarded pages.
-        */
-       return (bi->sequenceNumber <= dev->oldestDirtySequence);
-}
-
-/* FindDiretiestBlock is used to select the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static int yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
-                                       int aggressive)
-{
-       int b = dev->currentDirtyChecker;
-
-       int i;
-       int iterations;
-       int dirtiest = -1;
-       int pagesInUse = 0;
-       int prioritised = 0;
-       yaffs_BlockInfo *bi;
-       int pendingPrioritisedExist = 0;
-
-       /* First let's see if we need to grab a prioritised block */
-       if (dev->hasPendingPrioritisedGCs) {
-               for (i = dev->internalStartBlock; i < dev->internalEndBlock && !prioritised; i++) {
-
-                       bi = yaffs_GetBlockInfo(dev, i);
-                       /* yaffs_VerifyBlock(dev,bi,i); */
-
-                       if (bi->gcPrioritise) {
-                               pendingPrioritisedExist = 1;
-                               if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-                                  yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
-                                       pagesInUse = (bi->pagesInUse - bi->softDeletions);
-                                       dirtiest = i;
-                                       prioritised = 1;
-                                       aggressive = 1; /* Fool the non-aggressive skip logiv below */
-                               }
-                       }
-               }
-
-               if (!pendingPrioritisedExist) /* None found, so we can clear this */
-                       dev->hasPendingPrioritisedGCs = 0;
-       }
-
-       /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
-        * search harder.
-        * else (we're doing a leasurely gc), then we only bother to do this if the
-        * block has only a few pages in use.
-        */
-
-       dev->nonAggressiveSkip--;
-
-       if (!aggressive && (dev->nonAggressiveSkip > 0))
-               return -1;
-
-       if (!prioritised)
-               pagesInUse =
-                       (aggressive) ? dev->nChunksPerBlock : YAFFS_PASSIVE_GC_CHUNKS + 1;
-
-       if (aggressive)
-               iterations =
-                   dev->internalEndBlock - dev->internalStartBlock + 1;
-       else {
-               iterations =
-                   dev->internalEndBlock - dev->internalStartBlock + 1;
-               iterations = iterations / 16;
-               if (iterations > 200)
-                       iterations = 200;
-       }
-
-       for (i = 0; i <= iterations && pagesInUse > 0 && !prioritised; i++) {
-               b++;
-               if (b < dev->internalStartBlock || b > dev->internalEndBlock)
-                       b = dev->internalStartBlock;
-
-               if (b < dev->internalStartBlock || b > dev->internalEndBlock) {
-                       T(YAFFS_TRACE_ERROR,
-                         (TSTR("**>> Block %d is not valid" TENDSTR), b));
-                       YBUG();
-               }
-
-               bi = yaffs_GetBlockInfo(dev, b);
-
-               if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
-                       (bi->pagesInUse - bi->softDeletions) < pagesInUse &&
-                               yaffs_BlockNotDisqualifiedFromGC(dev, bi)) {
-                       dirtiest = b;
-                       pagesInUse = (bi->pagesInUse - bi->softDeletions);
-               }
-       }
-
-       dev->currentDirtyChecker = b;
-
-       if (dirtiest > 0) {
-               T(YAFFS_TRACE_GC,
-                 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR), dirtiest,
-                  dev->nChunksPerBlock - pagesInUse, prioritised));
-       }
-
-       dev->oldestDirtySequence = 0;
-
-       if (dirtiest > 0)
-               dev->nonAggressiveSkip = 4;
-
-       return dirtiest;
-}
-
-static void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
-{
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
-
-       int erasedOk = 0;
-
-       /* If the block is still healthy erase it and mark as clean.
-        * If the block has had a data failure, then retire it.
-        */
-
-       T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
-               (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
-               blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
-
-       bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
-
-       if (!bi->needsRetiring) {
-               yaffs_InvalidateCheckpoint(dev);
-               erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
-               if (!erasedOk) {
-                       dev->nErasureFailures++;
-                       T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-                         (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
-               }
-       }
-
-       if (erasedOk &&
-           ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
-               int i;
-               for (i = 0; i < dev->nChunksPerBlock; i++) {
-                       if (!yaffs_CheckChunkErased
-                           (dev, blockNo * dev->nChunksPerBlock + i)) {
-                               T(YAFFS_TRACE_ERROR,
-                                 (TSTR
-                                  (">>Block %d erasure supposedly OK, but chunk %d not erased"
-                                   TENDSTR), blockNo, i));
-                       }
-               }
-       }
-
-       if (erasedOk) {
-               /* Clean it up... */
-               bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
-               dev->nErasedBlocks++;
-               bi->pagesInUse = 0;
-               bi->softDeletions = 0;
-               bi->hasShrinkHeader = 0;
-               bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
-               bi->gcPrioritise = 0;
-               yaffs_ClearChunkBits(dev, blockNo);
-
-               T(YAFFS_TRACE_ERASE,
-                 (TSTR("Erased block %d" TENDSTR), blockNo));
-       } else {
-               dev->nFreeChunks -= dev->nChunksPerBlock;       /* We lost a block of free space */
-
-               yaffs_RetireBlock(dev, blockNo);
-               T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
-                 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
-       }
-}
-
-static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
-{
-       int i;
-
-       yaffs_BlockInfo *bi;
-
-       if (dev->nErasedBlocks < 1) {
-               /* Hoosterman we've got a problem.
-                * Can't get space to gc
-                */
-               T(YAFFS_TRACE_ERROR,
-                 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
-
-               return -1;
-       }
-
-       /* Find an empty block. */
-
-       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
-               dev->allocationBlockFinder++;
-               if (dev->allocationBlockFinder < dev->internalStartBlock
-                   || dev->allocationBlockFinder > dev->internalEndBlock) {
-                       dev->allocationBlockFinder = dev->internalStartBlock;
-               }
-
-               bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
-
-               if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
-                       bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
-                       dev->sequenceNumber++;
-                       bi->sequenceNumber = dev->sequenceNumber;
-                       dev->nErasedBlocks--;
-                       T(YAFFS_TRACE_ALLOCATE,
-                         (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
-                          dev->allocationBlockFinder, dev->sequenceNumber,
-                          dev->nErasedBlocks));
-                       return dev->allocationBlockFinder;
-               }
-       }
-
-       T(YAFFS_TRACE_ALWAYS,
-         (TSTR
-          ("yaffs tragedy: no more erased blocks, but there should have been %d"
-           TENDSTR), dev->nErasedBlocks));
-
-       return -1;
-}
-
-
-
-static int yaffs_CalcCheckpointBlocksRequired(yaffs_Device *dev)
-{
-       if (!dev->nCheckpointBlocksRequired &&
-          dev->isYaffs2) {
-               /* Not a valid value so recalculate */
-               int nBytes = 0;
-               int nBlocks;
-               int devBlocks = (dev->endBlock - dev->startBlock + 1);
-               int tnodeSize;
-
-               tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
-
-               if (tnodeSize < sizeof(yaffs_Tnode))
-                       tnodeSize = sizeof(yaffs_Tnode);
-
-               nBytes += sizeof(yaffs_CheckpointValidity);
-               nBytes += sizeof(yaffs_CheckpointDevice);
-               nBytes += devBlocks * sizeof(yaffs_BlockInfo);
-               nBytes += devBlocks * dev->chunkBitmapStride;
-               nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjectsCreated - dev->nFreeObjects);
-               nBytes += (tnodeSize + sizeof(__u32)) * (dev->nTnodesCreated - dev->nFreeTnodes);
-               nBytes += sizeof(yaffs_CheckpointValidity);
-               nBytes += sizeof(__u32); /* checksum*/
-
-               /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
-
-               nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->nChunksPerBlock)) + 3;
-
-               dev->nCheckpointBlocksRequired = nBlocks;
-       }
-
-       return dev->nCheckpointBlocksRequired;
-}
-
-/*
- * Check if there's space to allocate...
- * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
- */
-static int yaffs_CheckSpaceForAllocation(yaffs_Device *dev)
-{
-       int reservedChunks;
-       int reservedBlocks = dev->nReservedBlocks;
-       int checkpointBlocks;
-
-       if (dev->isYaffs2) {
-               checkpointBlocks =  yaffs_CalcCheckpointBlocksRequired(dev) -
-                                   dev->blocksInCheckpoint;
-               if (checkpointBlocks < 0)
-                       checkpointBlocks = 0;
-       } else {
-               checkpointBlocks = 0;
-       }
-
-       reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->nChunksPerBlock);
-
-       return (dev->nFreeChunks > reservedChunks);
-}
-
-static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
-               yaffs_BlockInfo **blockUsedPtr)
-{
-       int retVal;
-       yaffs_BlockInfo *bi;
-
-       if (dev->allocationBlock < 0) {
-               /* Get next block to allocate off */
-               dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
-               dev->allocationPage = 0;
-       }
-
-       if (!useReserve && !yaffs_CheckSpaceForAllocation(dev)) {
-               /* Not enough space to allocate unless we're allowed to use the reserve. */
-               return -1;
-       }
-
-       if (dev->nErasedBlocks < dev->nReservedBlocks
-                       && dev->allocationPage == 0) {
-               T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
-       }
-
-       /* Next page please.... */
-       if (dev->allocationBlock >= 0) {
-               bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
-
-               retVal = (dev->allocationBlock * dev->nChunksPerBlock) +
-                       dev->allocationPage;
-               bi->pagesInUse++;
-               yaffs_SetChunkBit(dev, dev->allocationBlock,
-                               dev->allocationPage);
-
-               dev->allocationPage++;
-
-               dev->nFreeChunks--;
-
-               /* If the block is full set the state to full */
-               if (dev->allocationPage >= dev->nChunksPerBlock) {
-                       bi->blockState = YAFFS_BLOCK_STATE_FULL;
-                       dev->allocationBlock = -1;
-               }
-
-               if (blockUsedPtr)
-                       *blockUsedPtr = bi;
-
-               return retVal;
-       }
-
-       T(YAFFS_TRACE_ERROR,
-                       (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
-
-       return -1;
-}
-
-static int yaffs_GetErasedChunks(yaffs_Device *dev)
-{
-       int n;
-
-       n = dev->nErasedBlocks * dev->nChunksPerBlock;
-
-       if (dev->allocationBlock > 0)
-               n += (dev->nChunksPerBlock - dev->allocationPage);
-
-       return n;
-
-}
-
-static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
-               int wholeBlock)
-{
-       int oldChunk;
-       int newChunk;
-       int markNAND;
-       int retVal = YAFFS_OK;
-       int cleanups = 0;
-       int i;
-       int isCheckpointBlock;
-       int matchingChunk;
-       int maxCopies;
-
-       int chunksBefore = yaffs_GetErasedChunks(dev);
-       int chunksAfter;
-
-       yaffs_ExtendedTags tags;
-
-       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
-
-       yaffs_Object *object;
-
-       isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
-
-       bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
-
-       T(YAFFS_TRACE_TRACING,
-                       (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
-                        block,
-                        bi->pagesInUse,
-                        bi->hasShrinkHeader,
-                        wholeBlock));
-
-       /*yaffs_VerifyFreeChunks(dev); */
-
-       bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
-
-       /* Take off the number of soft deleted entries because
-        * they're going to get really deleted during GC.
-        */
-       dev->nFreeChunks -= bi->softDeletions;
-
-       dev->isDoingGC = 1;
-
-       if (isCheckpointBlock ||
-                       !yaffs_StillSomeChunkBits(dev, block)) {
-               T(YAFFS_TRACE_TRACING,
-                               (TSTR
-                                ("Collecting block %d that has no chunks in use" TENDSTR),
-                                block));
-               yaffs_BlockBecameDirty(dev, block);
-       } else {
-
-               __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
-
-               yaffs_VerifyBlock(dev, bi, block);
-
-               maxCopies = (wholeBlock) ? dev->nChunksPerBlock : 10;
-               oldChunk = block * dev->nChunksPerBlock + dev->gcChunk;
-
-               for (/* init already done */;
-                    retVal == YAFFS_OK &&
-                    dev->gcChunk < dev->nChunksPerBlock &&
-                    (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
-                    maxCopies > 0;
-                    dev->gcChunk++, oldChunk++) {
-                       if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
-
-                               /* This page is in use and might need to be copied off */
-
-                               maxCopies--;
-
-                               markNAND = 1;
-
-                               yaffs_InitialiseTags(&tags);
-
-                               yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
-                                                               buffer, &tags);
-
-                               object =
-                                   yaffs_FindObjectByNumber(dev,
-                                                            tags.objectId);
-
-                               T(YAFFS_TRACE_GC_DETAIL,
-                                 (TSTR
-                                  ("Collecting chunk in block %d, %d %d %d " TENDSTR),
-                                  dev->gcChunk, tags.objectId, tags.chunkId,
-                                  tags.byteCount));
-
-                               if (object && !yaffs_SkipVerification(dev)) {
-                                       if (tags.chunkId == 0)
-                                               matchingChunk = object->hdrChunk;
-                                       else if (object->softDeleted)
-                                               matchingChunk = oldChunk; /* Defeat the test */
-                                       else
-                                               matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
-
-                                       if (oldChunk != matchingChunk)
-                                               T(YAFFS_TRACE_ERROR,
-                                                 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
-                                                 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
-
-                               }
-
-                               if (!object) {
-                                       T(YAFFS_TRACE_ERROR,
-                                         (TSTR
-                                          ("page %d in gc has no object: %d %d %d "
-                                           TENDSTR), oldChunk,
-                                           tags.objectId, tags.chunkId, tags.byteCount));
-                               }
-
-                               if (object &&
-                                   object->deleted &&
-                                   object->softDeleted &&
-                                   tags.chunkId != 0) {
-                                       /* Data chunk in a soft deleted file, throw it away
-                                        * It's a soft deleted data chunk,
-                                        * No need to copy this, just forget about it and
-                                        * fix up the object.
-                                        */
-
-                                       object->nDataChunks--;
-
-                                       if (object->nDataChunks <= 0) {
-                                               /* remeber to clean up the object */
-                                               dev->gcCleanupList[cleanups] =
-                                                   tags.objectId;
-                                               cleanups++;
-                                       }
-                                       markNAND = 0;
-                               } else if (0) {
-                                       /* Todo object && object->deleted && object->nDataChunks == 0 */
-                                       /* Deleted object header with no data chunks.
-                                        * Can be discarded and the file deleted.
-                                        */
-                                       object->hdrChunk = 0;
-                                       yaffs_FreeTnode(object->myDev,
-                                                       object->variant.
-                                                       fileVariant.top);
-                                       object->variant.fileVariant.top = NULL;
-                                       yaffs_DoGenericObjectDeletion(object);
-
-                               } else if (object) {
-                                       /* It's either a data chunk in a live file or
-                                        * an ObjectHeader, so we're interested in it.
-                                        * NB Need to keep the ObjectHeaders of deleted files
-                                        * until the whole file has been deleted off
-                                        */
-                                       tags.serialNumber++;
-
-                                       dev->nGCCopies++;
-
-                                       if (tags.chunkId == 0) {
-                                               /* It is an object Id,
-                                                * We need to nuke the shrinkheader flags first
-                                                * We no longer want the shrinkHeader flag since its work is done
-                                                * and if it is left in place it will mess up scanning.
-                                                */
-
-                                               yaffs_ObjectHeader *oh;
-                                               oh = (yaffs_ObjectHeader *)buffer;
-                                               oh->isShrink = 0;
-                                               tags.extraIsShrinkHeader = 0;
-
-                                               yaffs_VerifyObjectHeader(object, oh, &tags, 1);
-                                       }
-
-                                       newChunk =
-                                           yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
-
-                                       if (newChunk < 0) {
-                                               retVal = YAFFS_FAIL;
-                                       } else {
-
-                                               /* Ok, now fix up the Tnodes etc. */
-
-                                               if (tags.chunkId == 0) {
-                                                       /* It's a header */
-                                                       object->hdrChunk =  newChunk;
-                                                       object->serial =   tags.serialNumber;
-                                               } else {
-                                                       /* It's a data chunk */
-                                                       yaffs_PutChunkIntoFile
-                                                           (object,
-                                                            tags.chunkId,
-                                                            newChunk, 0);
-                                               }
-                                       }
-                               }
-
-                               if (retVal == YAFFS_OK)
-                                       yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
-
-                       }
-               }
-
-               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-
-               /* Do any required cleanups */
-               for (i = 0; i < cleanups; i++) {
-                       /* Time to delete the file too */
-                       object =
-                           yaffs_FindObjectByNumber(dev,
-                                                    dev->gcCleanupList[i]);
-                       if (object) {
-                               yaffs_FreeTnode(dev,
-                                               object->variant.fileVariant.
-                                               top);
-                               object->variant.fileVariant.top = NULL;
-                               T(YAFFS_TRACE_GC,
-                                 (TSTR
-                                  ("yaffs: About to finally delete object %d"
-                                   TENDSTR), object->objectId));
-                               yaffs_DoGenericObjectDeletion(object);
-                               object->myDev->nDeletedFiles--;
-                       }
-
-               }
-
-       }
-
-       yaffs_VerifyCollectedBlock(dev, bi, block);
+       if (chunkId > YAFFS_MAX_CHUNK_ID)
+               return NULL;
 
-       chunksAfter = yaffs_GetErasedChunks(dev);
-       if (chunksBefore >= chunksAfter) {
-               T(YAFFS_TRACE_GC,
-                 (TSTR
-                  ("gc did not increase free chunks before %d after %d"
-                   TENDSTR), chunksBefore, chunksAfter));
-       }
+       /* First check we're tall enough (ie enough topLevel) */
 
-       /* If the gc completed then clear the current gcBlock so that we find another. */
-       if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
-               dev->gcBlock = -1;
-               dev->gcChunk = 0;
+       x = chunkId >> YAFFS_TNODES_LEVEL0_BITS;
+       requiredTallness = 0;
+       while (x) {
+               x >>= YAFFS_TNODES_INTERNAL_BITS;
+               requiredTallness++;
        }
 
-       dev->isDoingGC = 0;
-
-       return retVal;
-}
 
-/* New garbage collector
- * If we're very low on erased blocks then we do aggressive garbage collection
- * otherwise we do "leasurely" garbage collection.
- * Aggressive gc looks further (whole array) and will accept less dirty blocks.
- * Passive gc only inspects smaller areas and will only accept more dirty blocks.
- *
- * The idea is to help clear out space in a more spread-out manner.
- * Dunno if it really does anything useful.
- */
-static int yaffs_CheckGarbageCollection(yaffs_Device *dev)
-{
-       int block;
-       int aggressive;
-       int gcOk = YAFFS_OK;
-       int maxTries = 0;
+       if (requiredTallness > fStruct->topLevel) {
+               /* Not tall enough, gotta make the tree taller */
+               for (i = fStruct->topLevel; i < requiredTallness; i++) {
 
-       int checkpointBlockAdjust;
+                       tn = yaffs_GetTnode(dev);
 
-       if (dev->isDoingGC) {
-               /* Bail out so we don't get recursive gc */
-               return YAFFS_OK;
+                       if (tn) {
+                               tn->internal[0] = fStruct->top;
+                               fStruct->top = tn;
+                               fStruct->topLevel++;
+                       } else {
+                               T(YAFFS_TRACE_ERROR,
+                                       (TSTR("yaffs: no more tnodes" TENDSTR)));
+                               return NULL;
+                       }
+               }
        }
 
-       /* This loop should pass the first time.
-        * We'll only see looping here if the erase of the collected block fails.
-        */
-
-       do {
-               maxTries++;
-
-               checkpointBlockAdjust = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
-               if (checkpointBlockAdjust < 0)
-                       checkpointBlockAdjust = 0;
+       /* Traverse down to level 0, adding anything we need */
 
-               if (dev->nErasedBlocks < (dev->nReservedBlocks + checkpointBlockAdjust + 2)) {
-                       /* We need a block soon...*/
-                       aggressive = 1;
-               } else {
-                       /* We're in no hurry */
-                       aggressive = 0;
-               }
+       l = fStruct->topLevel;
+       tn = fStruct->top;
 
-               if (dev->gcBlock <= 0) {
-                       dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive);
-                       dev->gcChunk = 0;
-               }
+       if (l > 0) {
+               while (l > 0 && tn) {
+                       x = (chunkId >>
+                            (YAFFS_TNODES_LEVEL0_BITS +
+                             (l - 1) * YAFFS_TNODES_INTERNAL_BITS)) &
+                           YAFFS_TNODES_INTERNAL_MASK;
 
-               block = dev->gcBlock;
 
-               if (block > 0) {
-                       dev->garbageCollections++;
-                       if (!aggressive)
-                               dev->passiveGarbageCollections++;
+                       if ((l > 1) && !tn->internal[x]) {
+                               /* Add missing non-level-zero tnode */
+                               tn->internal[x] = yaffs_GetTnode(dev);
+                               if(!tn->internal[x])
+                                       return NULL;
+                       } else if (l == 1) {
+                               /* Looking from level 1 at level 0 */
+                               if (passedTn) {
+                                       /* If we already have one, then release it.*/
+                                       if (tn->internal[x])
+                                               yaffs_FreeTnode(dev, tn->internal[x]);
+                                       tn->internal[x] = passedTn;
 
-                       T(YAFFS_TRACE_GC,
-                         (TSTR
-                          ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
-                          dev->nErasedBlocks, aggressive));
+                               } else if (!tn->internal[x]) {
+                                       /* Don't have one, none passed in */
+                                       tn->internal[x] = yaffs_GetTnode(dev);
+                                       if(!tn->internal[x])
+                                               return NULL;
+                               }
+                       }
 
-                       gcOk = yaffs_GarbageCollectBlock(dev, block, aggressive);
+                       tn = tn->internal[x];
+                       l--;
                }
-
-               if (dev->nErasedBlocks < (dev->nReservedBlocks) && block > 0) {
-                       T(YAFFS_TRACE_GC,
-                         (TSTR
-                          ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
-                           TENDSTR), dev->nErasedBlocks, maxTries, block));
+       } else {
+               /* top is level 0 */
+               if (passedTn) {
+                       memcpy(tn, passedTn, (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8);
+                       yaffs_FreeTnode(dev, passedTn);
                }
-       } while ((dev->nErasedBlocks < dev->nReservedBlocks) &&
-                (block > 0) &&
-                (maxTries < 2));
+       }
 
-       return aggressive ? gcOk : YAFFS_OK;
+       return tn;
 }
 
-/*-------------------------  TAGS --------------------------------*/
-
-static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
-                          int chunkInObject)
+static int yaffs_FindChunkInGroup(yaffs_Device *dev, int theChunk,
+                               yaffs_ExtendedTags *tags, int objectId,
+                               int chunkInInode)
 {
-       return (tags->chunkId == chunkInObject &&
-               tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
+       int j;
 
+       for (j = 0; theChunk && j < dev->chunkGroupSize; j++) {
+               if (yaffs_CheckChunkBit(dev, theChunk / dev->param.nChunksPerBlock,
+                               theChunk % dev->param.nChunksPerBlock)) {
+                       
+                       if(dev->chunkGroupSize == 1)
+                               return theChunk;
+                       else {
+                               yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL,
+                                                               tags);
+                               if (yaffs_TagsMatch(tags, objectId, chunkInInode)) {
+                                       /* found it; */
+                                       return theChunk;
+                               }
+                       }
+               }
+               theChunk++;
+       }
+       return -1;
 }
 
+#if 0
+/* Experimental code not being used yet. Might speed up file deletion */
+/* DeleteWorker scans backwards through the tnode tree and deletes all the
+ * chunks and tnodes in the file.
+ * Returns 1 if the tree was deleted.
+ * Returns 0 if it stopped early due to hitting the limit and the delete is incomplete.
+ */
 
-/*-------------------- Data file manipulation -----------------*/
-
-static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
-                                yaffs_ExtendedTags *tags)
+static int yaffs_DeleteWorker(yaffs_Object *in, yaffs_Tnode *tn, __u32 level,
+                             int chunkOffset, int *limit)
 {
-       /*Get the Tnode, then get the level 0 offset chunk offset */
-       yaffs_Tnode *tn;
-       int theChunk = -1;
-       yaffs_ExtendedTags localTags;
-       int retVal = -1;
-
+       int i;
+       int chunkInInode;
+       int theChunk;
+       yaffs_ExtendedTags tags;
+       int foundChunk;
        yaffs_Device *dev = in->myDev;
 
-       if (!tags) {
-               /* Passed a NULL, so use our own tags space */
-               tags = &localTags;
-       }
-
-       tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+       int allDone = 1;
 
        if (tn) {
-               theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+               if (level > 0) {
+                       for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+                            i--) {
+                               if (tn->internal[i]) {
+                                       if (limit && (*limit) < 0) {
+                                               allDone = 0;
+                                       } else {
+                                               allDone =
+                                                       yaffs_DeleteWorker(in,
+                                                               tn->
+                                                               internal
+                                                               [i],
+                                                               level -
+                                                               1,
+                                                               (chunkOffset
+                                                                       <<
+                                                                       YAFFS_TNODES_INTERNAL_BITS)
+                                                               + i,
+                                                               limit);
+                                       }
+                                       if (allDone) {
+                                               yaffs_FreeTnode(dev,
+                                                               tn->
+                                                               internal[i]);
+                                               tn->internal[i] = NULL;
+                                       }
+                               }
+                       }
+                       return (allDone) ? 1 : 0;
+               } else if (level == 0) {
+                       int hitLimit = 0;
 
-               retVal =
-                   yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-                                          chunkInInode);
-       }
-       return retVal;
-}
+                       for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0 && !hitLimit;
+                                       i--) {
+                               theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+                               if (theChunk) {
 
-static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
-                                         yaffs_ExtendedTags *tags)
-{
-       /* Get the Tnode, then get the level 0 offset chunk offset */
-       yaffs_Tnode *tn;
-       int theChunk = -1;
-       yaffs_ExtendedTags localTags;
+                                       chunkInInode = (chunkOffset <<
+                                               YAFFS_TNODES_LEVEL0_BITS) + i;
+
+                                       foundChunk =
+                                               yaffs_FindChunkInGroup(dev,
+                                                               theChunk,
+                                                               &tags,
+                                                               in->objectId,
+                                                               chunkInInode);
+
+                                       if (foundChunk > 0) {
+                                               yaffs_DeleteChunk(dev,
+                                                                 foundChunk, 1,
+                                                                 __LINE__);
+                                               in->nDataChunks--;
+                                               if (limit) {
+                                                       *limit = *limit - 1;
+                                                       if (*limit <= 0)
+                                                               hitLimit = 1;
+                                               }
 
-       yaffs_Device *dev = in->myDev;
-       int retVal = -1;
+                                       }
+
+                                       yaffs_LoadLevel0Tnode(dev, tn, i, 0);
+                               }
+
+                       }
+                       return (i < 0) ? 1 : 0;
+
+               }
 
-       if (!tags) {
-               /* Passed a NULL, so use our own tags space */
-               tags = &localTags;
        }
 
-       tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
+       return 1;
 
-       if (tn) {
+}
 
-               theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+#endif
 
-               retVal =
-                   yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
-                                          chunkInInode);
+static void yaffs_SoftDeleteChunk(yaffs_Device *dev, int chunk)
+{
+       yaffs_BlockInfo *theBlock;
+       unsigned blockNo;
 
-               /* Delete the entry in the filestructure (if found) */
-               if (retVal != -1)
-                       yaffs_PutLevel0Tnode(dev, tn, chunkInInode, 0);
-       }
+       T(YAFFS_TRACE_DELETION, (TSTR("soft delete chunk %d" TENDSTR), chunk));
 
-       return retVal;
+       blockNo =  chunk / dev->param.nChunksPerBlock;
+       theBlock = yaffs_GetBlockInfo(dev, blockNo);
+       if (theBlock) {
+               theBlock->softDeletions++;
+               dev->nFreeChunks++;
+               yaffs2_UpdateOldestDirtySequence(dev, blockNo, theBlock);
+       }
 }
 
-#ifdef YAFFS_PARANOID
+/* SoftDeleteWorker scans backwards through the tnode tree and soft deletes all the chunks in the file.
+ * All soft deleting does is increment the block's softdelete count and pulls the chunk out
+ * of the tnode.
+ * Thus, essentially this is the same as DeleteWorker except that the chunks are soft deleted.
+ */
 
-static int yaffs_CheckFileSanity(yaffs_Object *in)
+static int yaffs_SoftDeleteWorker(yaffs_Object *in, yaffs_Tnode *tn,
+                                 __u32 level, int chunkOffset)
 {
-       int chunk;
-       int nChunks;
-       int fSize;
-       int failed = 0;
-       int objId;
-       yaffs_Tnode *tn;
-       yaffs_Tags localTags;
-       yaffs_Tags *tags = &localTags;
+       int i;
        int theChunk;
-       int chunkDeleted;
+       int allDone = 1;
+       yaffs_Device *dev = in->myDev;
 
-       if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
-               return YAFFS_FAIL;
+       if (tn) {
+               if (level > 0) {
 
-       objId = in->objectId;
-       fSize = in->variant.fileVariant.fileSize;
-       nChunks =
-           (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
-
-       for (chunk = 1; chunk <= nChunks; chunk++) {
-               tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
-                                          chunk);
-
-               if (tn) {
-
-                       theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
-
-                       if (yaffs_CheckChunkBits
-                           (dev, theChunk / dev->nChunksPerBlock,
-                            theChunk % dev->nChunksPerBlock)) {
-
-                               yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
-                                                           tags,
-                                                           &chunkDeleted);
-                               if (yaffs_TagsMatch
-                                   (tags, in->objectId, chunk, chunkDeleted)) {
-                                       /* found it; */
+                       for (i = YAFFS_NTNODES_INTERNAL - 1; allDone && i >= 0;
+                            i--) {
+                               if (tn->internal[i]) {
+                                       allDone =
+                                           yaffs_SoftDeleteWorker(in,
+                                                                  tn->
+                                                                  internal[i],
+                                                                  level - 1,
+                                                                  (chunkOffset
+                                                                   <<
+                                                                   YAFFS_TNODES_INTERNAL_BITS)
+                                                                  + i);
+                                       if (allDone) {
+                                               yaffs_FreeTnode(dev,
+                                                               tn->
+                                                               internal[i]);
+                                               tn->internal[i] = NULL;
+                                       } else {
+                                               /* Hoosterman... how could this happen? */
+                                       }
+                               }
+                       }
+                       return (allDone) ? 1 : 0;
+               } else if (level == 0) {
 
+                       for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
+                               theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+                               if (theChunk) {
+                                       /* Note this does not find the real chunk, only the chunk group.
+                                        * We make an assumption that a chunk group is not larger than
+                                        * a block.
+                                        */
+                                       yaffs_SoftDeleteChunk(dev, theChunk);
+                                       yaffs_LoadLevel0Tnode(dev, tn, i, 0);
                                }
-                       } else {
 
-                               failed = 1;
                        }
+                       return 1;
 
-               } else {
-                       /* T(("No level 0 found for %d\n", chunk)); */
                }
+
        }
 
-       return failed ? YAFFS_FAIL : YAFFS_OK;
+       return 1;
+
 }
 
-#endif
+static void yaffs_SoftDeleteFile(yaffs_Object *obj)
+{
+       if (obj->deleted &&
+           obj->variantType == YAFFS_OBJECT_TYPE_FILE && !obj->softDeleted) {
+               if (obj->nDataChunks <= 0) {
+                       /* Empty file with no duplicate object headers, just delete it immediately */
+                       yaffs_FreeTnode(obj->myDev,
+                                       obj->variant.fileVariant.top);
+                       obj->variant.fileVariant.top = NULL;
+                       T(YAFFS_TRACE_TRACING,
+                         (TSTR("yaffs: Deleting empty file %d" TENDSTR),
+                          obj->objectId));
+                       yaffs_DoGenericObjectDeletion(obj);
+               } else {
+                       yaffs_SoftDeleteWorker(obj,
+                                              obj->variant.fileVariant.top,
+                                              obj->variant.fileVariant.
+                                              topLevel, 0);
+                       obj->softDeleted = 1;
+               }
+       }
+}
 
-static int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
-                                 int chunkInNAND, int inScan)
+/* Pruning removes any part of the file structure tree that is beyond the
+ * bounds of the file (ie that does not point to chunks).
+ *
+ * A file should only get pruned when its size is reduced.
+ *
+ * Before pruning, the chunks must be pulled from the tree and the
+ * level 0 tnode entries must be zeroed out.
+ * Could also use this for file deletion, but that's probably better handled
+ * by a special case.
+ *
+ * This function is recursive. For levels > 0 the function is called again on
+ * any sub-tree. For level == 0 we just check if the sub-tree has data.
+ * If there is no data in a subtree then it is pruned.
+ */
+
+static yaffs_Tnode *yaffs_PruneWorker(yaffs_Device *dev, yaffs_Tnode *tn,
+                               __u32 level, int del0)
 {
-       /* NB inScan is zero unless scanning.
-        * For forward scanning, inScan is > 0;
-        * for backward scanning inScan is < 0
-        */
+       int i;
+       int hasData;
 
-       yaffs_Tnode *tn;
-       yaffs_Device *dev = in->myDev;
-       int existingChunk;
-       yaffs_ExtendedTags existingTags;
-       yaffs_ExtendedTags newTags;
-       unsigned existingSerial, newSerial;
+       if (tn) {
+               hasData = 0;
 
-       if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
-               /* Just ignore an attempt at putting a chunk into a non-file during scanning
-                * If it is not during Scanning then something went wrong!
-                */
-               if (!inScan) {
-                       T(YAFFS_TRACE_ERROR,
-                         (TSTR
-                          ("yaffs tragedy:attempt to put data chunk into a non-file"
-                           TENDSTR)));
-                       YBUG();
-               }
+               if(level > 0){
+                       for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
+                               if (tn->internal[i]) {
+                                       tn->internal[i] =
+                                               yaffs_PruneWorker(dev, tn->internal[i],
+                                                       level - 1,
+                                                       (i == 0) ? del0 : 1);
+                               }
 
-               yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
-               return YAFFS_OK;
-       }
+                               if (tn->internal[i])
+                                       hasData++;
+                       }
+               } else {
+                       int tnodeSize_u32 = dev->tnodeSize/sizeof(__u32);
+                       __u32 *map = (__u32 *)tn;
 
-       tn = yaffs_AddOrFindLevel0Tnode(dev,
-                                       &in->variant.fileVariant,
-                                       chunkInInode,
-                                       NULL);
-       if (!tn)
-               return YAFFS_FAIL;
+                        for(i = 0; !hasData && i < tnodeSize_u32; i++){
+                                if(map[i])
+                                        hasData++;
+                        }
+                }
 
-       existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
+               if (hasData == 0 && del0) {
+                       /* Free and return NULL */
 
-       if (inScan != 0) {
-               /* If we're scanning then we need to test for duplicates
-                * NB This does not need to be efficient since it should only ever
-                * happen when the power fails during a write, then only one
-                * chunk should ever be affected.
-                *
-                * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
-                * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
-                */
+                       yaffs_FreeTnode(dev, tn);
+                       tn = NULL;
+               }
 
-               if (existingChunk > 0) {
-                       /* NB Right now existing chunk will not be real chunkId if the device >= 32MB
-                        *    thus we have to do a FindChunkInFile to get the real chunk id.
-                        *
-                        * We have a duplicate now we need to decide which one to use:
-                        *
-                        * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
-                        * Forward scanning YAFFS2: The new one is what we use, dump the old one.
-                        * YAFFS1: Get both sets of tags and compare serial numbers.
-                        */
+       }
 
-                       if (inScan > 0) {
-                               /* Only do this for forward scanning */
-                               yaffs_ReadChunkWithTagsFromNAND(dev,
-                                                               chunkInNAND,
-                                                               NULL, &newTags);
+       return tn;
 
-                               /* Do a proper find */
-                               existingChunk =
-                                   yaffs_FindChunkInFile(in, chunkInInode,
-                                                         &existingTags);
-                       }
+}
 
-                       if (existingChunk <= 0) {
-                               /*Hoosterman - how did this happen? */
+static int yaffs_PruneFileStructure(yaffs_Device *dev,
+                               yaffs_FileStructure *fStruct)
+{
+       int i;
+       int hasData;
+       int done = 0;
+       yaffs_Tnode *tn;
 
-                               T(YAFFS_TRACE_ERROR,
-                                 (TSTR
-                                  ("yaffs tragedy: existing chunk < 0 in scan"
-                                   TENDSTR)));
+       if (fStruct->topLevel > 0) {
+               fStruct->top =
+                   yaffs_PruneWorker(dev, fStruct->top, fStruct->topLevel, 0);
 
-                       }
+               /* Now we have a tree with all the non-zero branches NULL but the height
+                * is the same as it was.
+                * Let's see if we can trim internal tnodes to shorten the tree.
+                * We can do this if only the 0th element in the tnode is in use
+                * (ie all the non-zero are NULL)
+                */
 
-                       /* NB The deleted flags should be false, otherwise the chunks will
-                        * not be loaded during a scan
-                        */
+               while (fStruct->topLevel && !done) {
+                       tn = fStruct->top;
 
-                       if (inScan > 0) {
-                               newSerial = newTags.serialNumber;
-                               existingSerial = existingTags.serialNumber;
+                       hasData = 0;
+                       for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
+                               if (tn->internal[i])
+                                       hasData++;
                        }
-
-                       if ((inScan > 0) &&
-                           (in->myDev->isYaffs2 ||
-                            existingChunk <= 0 ||
-                            ((existingSerial + 1) & 3) == newSerial)) {
-                               /* Forward scanning.
-                                * Use new
-                                * Delete the old one and drop through to update the tnode
-                                */
-                               yaffs_DeleteChunk(dev, existingChunk, 1,
-                                                 __LINE__);
-                       } else {
-                               /* Backward scanning or we want to use the existing one
-                                * Use existing.
-                                * Delete the new one and return early so that the tnode isn't changed
-                                */
-                               yaffs_DeleteChunk(dev, chunkInNAND, 1,
-                                                 __LINE__);
-                               return YAFFS_OK;
+
+                       if (!hasData) {
+                               fStruct->top = tn->internal[0];
+                               fStruct->topLevel--;
+                               yaffs_FreeTnode(dev, tn);
+                       } else {
+                               done = 1;
                        }
                }
-
        }
 
-       if (existingChunk == 0)
-               in->nDataChunks++;
-
-       yaffs_PutLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
-
        return YAFFS_OK;
 }
 
-static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
-                                       __u8 *buffer)
-{
-       int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
-
-       if (chunkInNAND >= 0)
-               return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
-                                               buffer, NULL);
-       else {
-               T(YAFFS_TRACE_NANDACCESS,
-                 (TSTR("Chunk %d not found zero instead" TENDSTR),
-                  chunkInNAND));
-               /* get sane (zero) data if you read a hole */
-               memset(buffer, 0, in->myDev->nDataBytesPerChunk);
-               return 0;
-       }
+/*-------------------- End of File Structure functions.-------------------*/
 
-}
 
-void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
+/* AllocateEmptyObject gets us a clean Object. Tries to make allocate more if we run out */
+static yaffs_Object *yaffs_AllocateEmptyObject(yaffs_Device *dev)
 {
-       int block;
-       int page;
-       yaffs_ExtendedTags tags;
-       yaffs_BlockInfo *bi;
+       yaffs_Object *obj = yaffs_AllocateRawObject(dev);
 
-       if (chunkId <= 0)
-               return;
+       if (obj) {
+               dev->nObjects++;
 
-       dev->nDeletions++;
-       block = chunkId / dev->nChunksPerBlock;
-       page = chunkId % dev->nChunksPerBlock;
+               /* Now sweeten it up... */
 
+               memset(obj, 0, sizeof(yaffs_Object));
+               obj->beingCreated = 1;
 
-       if (!yaffs_CheckChunkBit(dev, block, page))
-               T(YAFFS_TRACE_VERIFY,
-                       (TSTR("Deleting invalid chunk %d"TENDSTR),
-                        chunkId));
+               obj->myDev = dev;
+               obj->hdrChunk = 0;
+               obj->variantType = YAFFS_OBJECT_TYPE_UNKNOWN;
+               YINIT_LIST_HEAD(&(obj->hardLinks));
+               YINIT_LIST_HEAD(&(obj->hashLink));
+               YINIT_LIST_HEAD(&obj->siblings);
 
-       bi = yaffs_GetBlockInfo(dev, block);
 
-       T(YAFFS_TRACE_DELETION,
-         (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
+               /* Now make the directory sane */
+               if (dev->rootDir) {
+                       obj->parent = dev->rootDir;
+                       ylist_add(&(obj->siblings), &dev->rootDir->variant.directoryVariant.children);
+               }
 
-       if (markNAND &&
-           bi->blockState != YAFFS_BLOCK_STATE_COLLECTING && !dev->isYaffs2) {
+               /* Add it to the lost and found directory.
+                * NB Can't put root or lostNFound in lostNFound so
+                * check if lostNFound exists first
+                */
+               if (dev->lostNFoundDir)
+                       yaffs_AddObjectToDirectory(dev->lostNFoundDir, obj);
 
-               yaffs_InitialiseTags(&tags);
+               obj->beingCreated = 0;
+       }
 
-               tags.chunkDeleted = 1;
+       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
 
-               yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
-               yaffs_HandleUpdateChunk(dev, chunkId, &tags);
-       } else {
-               dev->nUnmarkedDeletions++;
-       }
+       return obj;
+}
 
-       /* Pull out of the management area.
-        * If the whole block became dirty, this will kick off an erasure.
-        */
-       if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
-           bi->blockState == YAFFS_BLOCK_STATE_FULL ||
-           bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-           bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
-               dev->nFreeChunks++;
+static yaffs_Object *yaffs_CreateFakeDirectory(yaffs_Device *dev, int number,
+                                              __u32 mode)
+{
 
-               yaffs_ClearChunkBit(dev, block, page);
+       yaffs_Object *obj =
+           yaffs_CreateNewObject(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
+       if (obj) {
+               obj->fake = 1;          /* it is fake so it might have no NAND presence... */
+               obj->renameAllowed = 0; /* ... and we're not allowed to rename it... */
+               obj->unlinkAllowed = 0; /* ... or unlink it */
+               obj->deleted = 0;
+               obj->unlinked = 0;
+               obj->yst_mode = mode;
+               obj->myDev = dev;
+               obj->hdrChunk = 0;      /* Not a valid chunk. */
+       }
 
-               bi->pagesInUse--;
+       return obj;
 
-               if (bi->pagesInUse == 0 &&
-                   !bi->hasShrinkHeader &&
-                   bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
-                   bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-                       yaffs_BlockBecameDirty(dev, block);
-               }
+}
 
-       }
+static void yaffs_UnhashObject(yaffs_Object *obj)
+{
+       int bucket;
+       yaffs_Device *dev = obj->myDev;
 
+       /* If it is still linked into the bucket list, free from the list */
+       if (!ylist_empty(&obj->hashLink)) {
+               ylist_del_init(&obj->hashLink);
+               bucket = yaffs_HashFunction(obj->objectId);
+               dev->objectBucket[bucket].count--;
+       }
 }
 
-static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
-                                       const __u8 *buffer, int nBytes,
-                                       int useReserve)
+/*  FreeObject frees up a Object and puts it back on the free list */
+static void yaffs_FreeObject(yaffs_Object *obj)
 {
-       /* Find old chunk Need to do this to get serial number
-        * Write new one and patch into tree.
-        * Invalidate old tags.
-        */
+       yaffs_Device *dev = obj->myDev;
 
-       int prevChunkId;
-       yaffs_ExtendedTags prevTags;
+       T(YAFFS_TRACE_OS, (TSTR("FreeObject %p inode %p"TENDSTR), obj, obj->myInode));
 
-       int newChunkId;
-       yaffs_ExtendedTags newTags;
+       if (!obj)
+               YBUG();
+       if (obj->parent)
+               YBUG();
+       if (!ylist_empty(&obj->siblings))
+               YBUG();
 
-       yaffs_Device *dev = in->myDev;
 
-       yaffs_CheckGarbageCollection(dev);
+       if (obj->myInode) {
+               /* We're still hooked up to a cached inode.
+                * Don't delete now, but mark for later deletion
+                */
+               obj->deferedFree = 1;
+               return;
+       }
+
+       yaffs_UnhashObject(obj);
 
-       /* Get the previous chunk at this location in the file if it exists */
-       prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+       yaffs_FreeRawObject(dev,obj);
+       dev->nObjects--;
+       dev->nCheckpointBlocksRequired = 0; /* force recalculation*/
+}
 
-       /* Set up new tags */
-       yaffs_InitialiseTags(&newTags);
 
-       newTags.chunkId = chunkInInode;
-       newTags.objectId = in->objectId;
-       newTags.serialNumber =
-           (prevChunkId >= 0) ? prevTags.serialNumber + 1 : 1;
-       newTags.byteCount = nBytes;
+void yaffs_HandleDeferedFree(yaffs_Object *obj)
+{
+       if (obj->deferedFree)
+               yaffs_FreeObject(obj);
+}
 
-       if (nBytes < 1 || nBytes > dev->totalBytesPerChunk) {
-               T(YAFFS_TRACE_ERROR,
-               (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
-               YBUG();
+static void yaffs_InitialiseTnodesAndObjects(yaffs_Device *dev)
+{
+       int i;
+
+       dev->nObjects = 0;
+       dev->nTnodes = 0;
+
+       yaffs_InitialiseRawTnodesAndObjects(dev);
+
+       for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
+               YINIT_LIST_HEAD(&dev->objectBucket[i].list);
+               dev->objectBucket[i].count = 0;
        }
+}
 
-       newChunkId =
-           yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-                                             useReserve);
+static int yaffs_FindNiceObjectBucket(yaffs_Device *dev)
+{
+       int i;
+       int l = 999;
+       int lowest = 999999;
 
-       if (newChunkId >= 0) {
-               yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
 
-               if (prevChunkId >= 0)
-                       yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
+       /* Search for the shortest list or one that
+        * isn't too long.
+        */
+
+       for (i = 0; i < 10 && lowest > 4; i++) {
+               dev->bucketFinder++;
+               dev->bucketFinder %= YAFFS_NOBJECT_BUCKETS;
+               if (dev->objectBucket[dev->bucketFinder].count < lowest) {
+                       lowest = dev->objectBucket[dev->bucketFinder].count;
+                       l = dev->bucketFinder;
+               }
 
-               yaffs_CheckFileSanity(in);
        }
-       return newChunkId;
 
+       return l;
 }
 
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
-                            int isShrink, int shadows)
+static int yaffs_CreateNewObjectNumber(yaffs_Device *dev)
 {
+       int bucket = yaffs_FindNiceObjectBucket(dev);
 
-       yaffs_BlockInfo *bi;
+       /* Now find an object value that has not already been taken
+        * by scanning the list.
+        */
 
-       yaffs_Device *dev = in->myDev;
+       int found = 0;
+       struct ylist_head *i;
 
-       int prevChunkId;
-       int retVal = 0;
-       int result = 0;
+       __u32 n = (__u32) bucket;
 
-       int newChunkId;
-       yaffs_ExtendedTags newTags;
-       yaffs_ExtendedTags oldTags;
+       /* yaffs_CheckObjectHashSanity();  */
 
-       __u8 *buffer = NULL;
-       YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
+       while (!found) {
+               found = 1;
+               n += YAFFS_NOBJECT_BUCKETS;
+               if (1 || dev->objectBucket[bucket].count > 0) {
+                       ylist_for_each(i, &dev->objectBucket[bucket].list) {
+                               /* If there is already one in the list */
+                               if (i && ylist_entry(i, yaffs_Object,
+                                               hashLink)->objectId == n) {
+                                       found = 0;
+                               }
+                       }
+               }
+       }
 
-       yaffs_ObjectHeader *oh = NULL;
+       return n;
+}
 
-       yaffs_strcpy(oldName, _Y("silly old name"));
+static void yaffs_HashObject(yaffs_Object *in)
+{
+       int bucket = yaffs_HashFunction(in->objectId);
+       yaffs_Device *dev = in->myDev;
 
+       ylist_add(&in->hashLink, &dev->objectBucket[bucket].list);
+       dev->objectBucket[bucket].count++;
+}
 
-       if (!in->fake ||
-               in == dev->rootDir || /* The rootDir should also be saved */
-               force) {
+yaffs_Object *yaffs_FindObjectByNumber(yaffs_Device *dev, __u32 number)
+{
+       int bucket = yaffs_HashFunction(number);
+       struct ylist_head *i;
+       yaffs_Object *in;
 
-               yaffs_CheckGarbageCollection(dev);
-               yaffs_CheckObjectDetailsLoaded(in);
+       ylist_for_each(i, &dev->objectBucket[bucket].list) {
+               /* Look if it is in the list */
+               if (i) {
+                       in = ylist_entry(i, yaffs_Object, hashLink);
+                       if (in->objectId == number) {
 
-               buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
-               oh = (yaffs_ObjectHeader *) buffer;
+                               /* Don't tell the VFS about this one if it is defered free */
+                               if (in->deferedFree)
+                                       return NULL;
 
-               prevChunkId = in->hdrChunk;
+                               return in;
+                       }
+               }
+       }
 
-               if (prevChunkId > 0) {
-                       result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
-                                                       buffer, &oldTags);
+       return NULL;
+}
 
-                       yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
+yaffs_Object *yaffs_CreateNewObject(yaffs_Device *dev, int number,
+                                   yaffs_ObjectType type)
+{
+       yaffs_Object *theObject=NULL;
+       yaffs_Tnode *tn = NULL;
+
+       if (number < 0)
+               number = yaffs_CreateNewObjectNumber(dev);
 
-                       memcpy(oldName, oh->name, sizeof(oh->name));
-               }
+       if (type == YAFFS_OBJECT_TYPE_FILE) {
+               tn = yaffs_GetTnode(dev);
+               if (!tn)
+                       return NULL;
+       }
 
-               memset(buffer, 0xFF, dev->nDataBytesPerChunk);
+       theObject = yaffs_AllocateEmptyObject(dev);
+       if (!theObject){
+               if(tn)
+                       yaffs_FreeTnode(dev,tn);
+               return NULL;
+       }
 
-               oh->type = in->variantType;
-               oh->yst_mode = in->yst_mode;
-               oh->shadowsObject = oh->inbandShadowsObject = shadows;
 
+       if (theObject) {
+               theObject->fake = 0;
+               theObject->renameAllowed = 1;
+               theObject->unlinkAllowed = 1;
+               theObject->objectId = number;
+               yaffs_HashObject(theObject);
+               theObject->variantType = type;
 #ifdef CONFIG_YAFFS_WINCE
-               oh->win_atime[0] = in->win_atime[0];
-               oh->win_ctime[0] = in->win_ctime[0];
-               oh->win_mtime[0] = in->win_mtime[0];
-               oh->win_atime[1] = in->win_atime[1];
-               oh->win_ctime[1] = in->win_ctime[1];
-               oh->win_mtime[1] = in->win_mtime[1];
-#else
-               oh->yst_uid = in->yst_uid;
-               oh->yst_gid = in->yst_gid;
-               oh->yst_atime = in->yst_atime;
-               oh->yst_mtime = in->yst_mtime;
-               oh->yst_ctime = in->yst_ctime;
-               oh->yst_rdev = in->yst_rdev;
-#endif
-               if (in->parent)
-                       oh->parentObjectId = in->parent->objectId;
-               else
-                       oh->parentObjectId = 0;
-
-               if (name && *name) {
-                       memset(oh->name, 0, sizeof(oh->name));
-                       yaffs_strncpy(oh->name, name, YAFFS_MAX_NAME_LENGTH);
-               } else if (prevChunkId >= 0)
-                       memcpy(oh->name, oldName, sizeof(oh->name));
-               else
-                       memset(oh->name, 0, sizeof(oh->name));
+               yfsd_WinFileTimeNow(theObject->win_atime);
+               theObject->win_ctime[0] = theObject->win_mtime[0] =
+                   theObject->win_atime[0];
+               theObject->win_ctime[1] = theObject->win_mtime[1] =
+                   theObject->win_atime[1];
 
-               oh->isShrink = isShrink;
+#else
 
-               switch (in->variantType) {
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-                       /* Should not happen */
-                       break;
+               theObject->yst_atime = theObject->yst_mtime =
+                   theObject->yst_ctime = Y_CURRENT_TIME;
+#endif
+               switch (type) {
                case YAFFS_OBJECT_TYPE_FILE:
-                       oh->fileSize =
-                           (oh->parentObjectId == YAFFS_OBJECTID_DELETED
-                            || oh->parentObjectId ==
-                            YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
-                           fileVariant.fileSize;
-                       break;
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-                       oh->equivalentObjectId =
-                           in->variant.hardLinkVariant.equivalentObjectId;
-                       break;
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-                       /* Do nothing */
+                       theObject->variant.fileVariant.fileSize = 0;
+                       theObject->variant.fileVariant.scannedFileSize = 0;
+                       theObject->variant.fileVariant.shrinkSize = 0xFFFFFFFF; /* max __u32 */
+                       theObject->variant.fileVariant.topLevel = 0;
+                       theObject->variant.fileVariant.top = tn;
                        break;
                case YAFFS_OBJECT_TYPE_DIRECTORY:
-                       /* Do nothing */
+                       YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
+                                       children);
+                       YINIT_LIST_HEAD(&theObject->variant.directoryVariant.
+                                       dirty);
                        break;
                case YAFFS_OBJECT_TYPE_SYMLINK:
-                       yaffs_strncpy(oh->alias,
-                                     in->variant.symLinkVariant.alias,
-                                     YAFFS_MAX_ALIAS_LENGTH);
-                       oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+               case YAFFS_OBJECT_TYPE_HARDLINK:
+               case YAFFS_OBJECT_TYPE_SPECIAL:
+                       /* No action required */
+                       break;
+               case YAFFS_OBJECT_TYPE_UNKNOWN:
+                       /* todo this should not happen */
                        break;
                }
+       }
 
-               /* Tags */
-               yaffs_InitialiseTags(&newTags);
-               in->serial++;
-               newTags.chunkId = 0;
-               newTags.objectId = in->objectId;
-               newTags.serialNumber = in->serial;
-
-               /* Add extra info for file header */
-
-               newTags.extraHeaderInfoAvailable = 1;
-               newTags.extraParentObjectId = oh->parentObjectId;
-               newTags.extraFileLength = oh->fileSize;
-               newTags.extraIsShrinkHeader = oh->isShrink;
-               newTags.extraEquivalentObjectId = oh->equivalentObjectId;
-               newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
-               newTags.extraObjectType = in->variantType;
-
-               yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
+       return theObject;
+}
 
-               /* Create new chunk in NAND */
-               newChunkId =
-                   yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
-                                                     (prevChunkId >= 0) ? 1 : 0);
+yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+                                               int number,
+                                               yaffs_ObjectType type)
+{
+       yaffs_Object *theObject = NULL;
 
-               if (newChunkId >= 0) {
+       if (number > 0)
+               theObject = yaffs_FindObjectByNumber(dev, number);
 
-                       in->hdrChunk = newChunkId;
+       if (!theObject)
+               theObject = yaffs_CreateNewObject(dev, number, type);
 
-                       if (prevChunkId >= 0) {
-                               yaffs_DeleteChunk(dev, prevChunkId, 1,
-                                                 __LINE__);
-                       }
+       return theObject;
 
-                       if (!yaffs_ObjectHasCachedWriteData(in))
-                               in->dirty = 0;
+}
 
-                       /* If this was a shrink, then mark the block that the chunk lives on */
-                       if (isShrink) {
-                               bi = yaffs_GetBlockInfo(in->myDev,
-                                       newChunkId / in->myDev->nChunksPerBlock);
-                               bi->hasShrinkHeader = 1;
-                       }
 
-               }
+YCHAR *yaffs_CloneString(const YCHAR *str)
+{
+       YCHAR *newStr = NULL;
+       int len;
 
-               retVal = newChunkId;
+       if (!str)
+               str = _Y("");
 
+       len = yaffs_strnlen(str,YAFFS_MAX_ALIAS_LENGTH);
+       newStr = YMALLOC((len + 1) * sizeof(YCHAR));
+       if (newStr){
+               yaffs_strncpy(newStr, str,len);
+               newStr[len] = 0;
        }
+       return newStr;
 
-       if (buffer)
-               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
-
-       return retVal;
 }
 
-/*------------------------ Short Operations Cache ----------------------------------------
- *   In many situations where there is no high level buffering (eg WinCE) a lot of
- *   reads might be short sequential reads, and a lot of writes may be short
- *   sequential writes. eg. scanning/writing a jpeg file.
- *   In these cases, a short read/write cache can provide a huge perfomance benefit
- *   with dumb-as-a-rock code.
- *   In Linux, the page cache provides read buffering aand the short op cache provides write
- *   buffering.
- *
- *   There are a limited number (~10) of cache chunks per device so that we don't
- *   need a very intelligent search.
+/*
+ * Mknod (create) a new object.
+ * equivalentObject only has meaning for a hard link;
+ * aliasString only has meaning for a symlink.
+ * rdev only has meaning for devices (a subset of special objects)
  */
 
-static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
+static yaffs_Object *yaffs_MknodObject(yaffs_ObjectType type,
+                                      yaffs_Object *parent,
+                                      const YCHAR *name,
+                                      __u32 mode,
+                                      __u32 uid,
+                                      __u32 gid,
+                                      yaffs_Object *equivalentObject,
+                                      const YCHAR *aliasString, __u32 rdev)
 {
-       yaffs_Device *dev = obj->myDev;
-       int i;
-       yaffs_ChunkCache *cache;
-       int nCaches = obj->myDev->nShortOpCaches;
+       yaffs_Object *in;
+       YCHAR *str = NULL;
 
-       for (i = 0; i < nCaches; i++) {
-               cache = &dev->srCache[i];
-               if (cache->object == obj &&
-                   cache->dirty)
-                       return 1;
+       yaffs_Device *dev = parent->myDev;
+
+       /* Check if the entry exists. If it does then fail the call since we don't want a dup.*/
+       if (yaffs_FindObjectByName(parent, name))
+               return NULL;
+
+       if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
+               str = yaffs_CloneString(aliasString);
+               if (!str)
+                       return NULL;
        }
 
-       return 0;
-}
+       in = yaffs_CreateNewObject(dev, -1, type);
 
+       if (!in){
+               if(str)
+                       YFREE(str);
+               return NULL;
+       }
 
-static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
-{
-       yaffs_Device *dev = obj->myDev;
-       int lowest = -99;       /* Stop compiler whining. */
-       int i;
-       yaffs_ChunkCache *cache;
-       int chunkWritten = 0;
-       int nCaches = obj->myDev->nShortOpCaches;
 
-       if (nCaches > 0) {
-               do {
-                       cache = NULL;
 
-                       /* Find the dirty cache for this object with the lowest chunk id. */
-                       for (i = 0; i < nCaches; i++) {
-                               if (dev->srCache[i].object == obj &&
-                                   dev->srCache[i].dirty) {
-                                       if (!cache
-                                           || dev->srCache[i].chunkId <
-                                           lowest) {
-                                               cache = &dev->srCache[i];
-                                               lowest = cache->chunkId;
-                                       }
-                               }
-                       }
 
-                       if (cache && !cache->locked) {
-                               /* Write it out and free it up */
 
-                               chunkWritten =
-                                   yaffs_WriteChunkDataToObject(cache->object,
-                                                                cache->chunkId,
-                                                                cache->data,
-                                                                cache->nBytes,
-                                                                1);
-                               cache->dirty = 0;
-                               cache->object = NULL;
-                       }
+       if (in) {
+               in->hdrChunk = 0;
+               in->valid = 1;
+               in->variantType = type;
 
-               } while (cache && chunkWritten > 0);
+               in->yst_mode = mode;
 
-               if (cache) {
-                       /* Hoosterman, disk full while writing cache out. */
-                       T(YAFFS_TRACE_ERROR,
-                         (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
+#ifdef CONFIG_YAFFS_WINCE
+               yfsd_WinFileTimeNow(in->win_atime);
+               in->win_ctime[0] = in->win_mtime[0] = in->win_atime[0];
+               in->win_ctime[1] = in->win_mtime[1] = in->win_atime[1];
+
+#else
+               in->yst_atime = in->yst_mtime = in->yst_ctime = Y_CURRENT_TIME;
+
+               in->yst_rdev = rdev;
+               in->yst_uid = uid;
+               in->yst_gid = gid;
+#endif
+               in->nDataChunks = 0;
+
+               yaffs_SetObjectName(in, name);
+               in->dirty = 1;
+
+               yaffs_AddObjectToDirectory(parent, in);
+
+               in->myDev = parent->myDev;
+
+               switch (type) {
+               case YAFFS_OBJECT_TYPE_SYMLINK:
+                       in->variant.symLinkVariant.alias = str;
+                       break;
+               case YAFFS_OBJECT_TYPE_HARDLINK:
+                       in->variant.hardLinkVariant.equivalentObject =
+                               equivalentObject;
+                       in->variant.hardLinkVariant.equivalentObjectId =
+                               equivalentObject->objectId;
+                       ylist_add(&in->hardLinks, &equivalentObject->hardLinks);
+                       break;
+               case YAFFS_OBJECT_TYPE_FILE:
+               case YAFFS_OBJECT_TYPE_DIRECTORY:
+               case YAFFS_OBJECT_TYPE_SPECIAL:
+               case YAFFS_OBJECT_TYPE_UNKNOWN:
+                       /* do nothing */
+                       break;
+               }
 
+               if (yaffs_UpdateObjectHeader(in, name, 0, 0, 0, NULL) < 0) {
+                       /* Could not create the object header, fail the creation */
+                       yaffs_DeleteObject(in);
+                       in = NULL;
                }
+
+               yaffs_UpdateParent(parent);
        }
 
+       return in;
 }
 
-/*yaffs_FlushEntireDeviceCache(dev)
- *
- *
- */
-
-void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
+yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
+                       __u32 mode, __u32 uid, __u32 gid)
 {
-       yaffs_Object *obj;
-       int nCaches = dev->nShortOpCaches;
-       int i;
-
-       /* Find a dirty object in the cache and flush it...
-        * until there are no further dirty objects.
-        */
-       do {
-               obj = NULL;
-               for (i = 0; i < nCaches && !obj; i++) {
-                       if (dev->srCache[i].object &&
-                           dev->srCache[i].dirty)
-                               obj = dev->srCache[i].object;
-
-               }
-               if (obj)
-                       yaffs_FlushFilesChunkCache(obj);
+       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
+                               uid, gid, NULL, NULL, 0);
+}
 
-       } while (obj);
+yaffs_Object *yaffs_MknodDirectory(yaffs_Object *parent, const YCHAR *name,
+                               __u32 mode, __u32 uid, __u32 gid)
+{
+       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
+                                mode, uid, gid, NULL, NULL, 0);
+}
 
+yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
+                               __u32 mode, __u32 uid, __u32 gid, __u32 rdev)
+{
+       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
+                                uid, gid, NULL, NULL, rdev);
 }
 
+yaffs_Object *yaffs_MknodSymLink(yaffs_Object *parent, const YCHAR *name,
+                               __u32 mode, __u32 uid, __u32 gid,
+                               const YCHAR *alias)
+{
+       return yaffs_MknodObject(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
+                               uid, gid, NULL, alias, 0);
+}
 
-/* Grab us a cache chunk for use.
- * First look for an empty one.
- * Then look for the least recently used non-dirty one.
- * Then look for the least recently used dirty one...., flush and look again.
- */
-static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
+/* yaffs_Link returns the object id of the equivalent object.*/
+yaffs_Object *yaffs_Link(yaffs_Object *parent, const YCHAR *name,
+                       yaffs_Object *equivalentObject)
 {
-       int i;
+       /* Get the real object in case we were fed a hard link as an equivalent object */
+       equivalentObject = yaffs_GetEquivalentObject(equivalentObject);
 
-       if (dev->nShortOpCaches > 0) {
-               for (i = 0; i < dev->nShortOpCaches; i++) {
-                       if (!dev->srCache[i].object)
-                               return &dev->srCache[i];
-               }
+       if (yaffs_MknodObject
+           (YAFFS_OBJECT_TYPE_HARDLINK, parent, name, 0, 0, 0,
+            equivalentObject, NULL, 0)) {
+               return equivalentObject;
+       } else {
+               return NULL;
        }
 
-       return NULL;
 }
 
-static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
+static int yaffs_ChangeObjectName(yaffs_Object *obj, yaffs_Object *newDir,
+                               const YCHAR *newName, int force, int shadows)
 {
-       yaffs_ChunkCache *cache;
-       yaffs_Object *theObj;
-       int usage;
-       int i;
-       int pushout;
-
-       if (dev->nShortOpCaches > 0) {
-               /* Try find a non-dirty one... */
+       int unlinkOp;
+       int deleteOp;
 
-               cache = yaffs_GrabChunkCacheWorker(dev);
+       yaffs_Object *existingTarget;
 
-               if (!cache) {
-                       /* They were all dirty, find the last recently used object and flush
-                        * its cache, then  find again.
-                        * NB what's here is not very accurate, we actually flush the object
-                        * the last recently used page.
-                        */
+       if (newDir == NULL)
+               newDir = obj->parent;   /* use the old directory */
 
-                       /* With locking we can't assume we can use entry zero */
+       if (newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+               T(YAFFS_TRACE_ALWAYS,
+                 (TSTR
+                  ("tragedy: yaffs_ChangeObjectName: newDir is not a directory"
+                   TENDSTR)));
+               YBUG();
+       }
 
-                       theObj = NULL;
-                       usage = -1;
-                       cache = NULL;
-                       pushout = -1;
+       /* TODO: Do we need this different handling for YAFFS2 and YAFFS1?? */
+       if (obj->myDev->param.isYaffs2)
+               unlinkOp = (newDir == obj->myDev->unlinkedDir);
+       else
+               unlinkOp = (newDir == obj->myDev->unlinkedDir
+                           && obj->variantType == YAFFS_OBJECT_TYPE_FILE);
 
-                       for (i = 0; i < dev->nShortOpCaches; i++) {
-                               if (dev->srCache[i].object &&
-                                   !dev->srCache[i].locked &&
-                                   (dev->srCache[i].lastUse < usage || !cache)) {
-                                       usage = dev->srCache[i].lastUse;
-                                       theObj = dev->srCache[i].object;
-                                       cache = &dev->srCache[i];
-                                       pushout = i;
-                               }
-                       }
+       deleteOp = (newDir == obj->myDev->deletedDir);
 
-                       if (!cache || cache->dirty) {
-                               /* Flush and try again */
-                               yaffs_FlushFilesChunkCache(theObj);
-                               cache = yaffs_GrabChunkCacheWorker(dev);
-                       }
+       existingTarget = yaffs_FindObjectByName(newDir, newName);
 
-               }
-               return cache;
-       } else
-               return NULL;
+       /* If the object is a file going into the unlinked directory,
+        *   then it is OK to just stuff it in since duplicate names are allowed.
+        *   else only proceed if the new name does not exist and if we're putting
+        *   it into a directory.
+        */
+       if ((unlinkOp ||
+            deleteOp ||
+            force ||
+            (shadows > 0) ||
+            !existingTarget) &&
+           newDir->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) {
+               yaffs_SetObjectName(obj, newName);
+               obj->dirty = 1;
 
-}
+               yaffs_AddObjectToDirectory(newDir, obj);
 
-/* Find a cached chunk */
-static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
-                                             int chunkId)
-{
-       yaffs_Device *dev = obj->myDev;
-       int i;
-       if (dev->nShortOpCaches > 0) {
-               for (i = 0; i < dev->nShortOpCaches; i++) {
-                       if (dev->srCache[i].object == obj &&
-                           dev->srCache[i].chunkId == chunkId) {
-                               dev->cacheHits++;
+               if (unlinkOp)
+                       obj->unlinked = 1;
 
-                               return &dev->srCache[i];
-                       }
-               }
+               /* If it is a deletion then we mark it as a shrink for gc purposes. */
+               if (yaffs_UpdateObjectHeader(obj, newName, 0, deleteOp, shadows, NULL) >= 0)
+                       return YAFFS_OK;
        }
-       return NULL;
+
+       return YAFFS_FAIL;
 }
 
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
-                               int isAWrite)
+int yaffs_RenameObject(yaffs_Object *oldDir, const YCHAR *oldName,
+               yaffs_Object *newDir, const YCHAR *newName)
 {
+       yaffs_Object *obj = NULL;
+       yaffs_Object *existingTarget = NULL;
+       int force = 0;
+       int result;
+       yaffs_Device *dev;
 
-       if (dev->nShortOpCaches > 0) {
-               if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
-                       /* Reset the cache usages */
-                       int i;
-                       for (i = 1; i < dev->nShortOpCaches; i++)
-                               dev->srCache[i].lastUse = 0;
 
-                       dev->srLastUse = 0;
-               }
+       if (!oldDir || oldDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+               YBUG();
+       if (!newDir || newDir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+               YBUG();
 
-               dev->srLastUse++;
+       dev = oldDir->myDev;
 
-               cache->lastUse = dev->srLastUse;
+#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
+       /* Special case for case insemsitive systems (eg. WinCE).
+        * While look-up is case insensitive, the name isn't.
+        * Therefore we might want to change x.txt to X.txt
+       */
+       if (oldDir == newDir && yaffs_strcmp(oldName, newName) == 0)
+               force = 1;
+#endif
 
-               if (isAWrite)
-                       cache->dirty = 1;
-       }
-}
+       if(yaffs_strnlen(newName,YAFFS_MAX_NAME_LENGTH+1) > YAFFS_MAX_NAME_LENGTH)
+               /* ENAMETOOLONG */
+               return YAFFS_FAIL;
 
-/* Invalidate a single cache page.
- * Do this when a whole page gets written,
- * ie the short cache for this page is no longer valid.
- */
-static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
-{
-       if (object->myDev->nShortOpCaches > 0) {
-               yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
+       obj = yaffs_FindObjectByName(oldDir, oldName);
 
-               if (cache)
-                       cache->object = NULL;
-       }
-}
+       if (obj && obj->renameAllowed) {
 
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
-{
-       int i;
-       yaffs_Device *dev = in->myDev;
+               /* Now do the handling for an existing target, if there is one */
 
-       if (dev->nShortOpCaches > 0) {
-               /* Invalidate it. */
-               for (i = 0; i < dev->nShortOpCaches; i++) {
-                       if (dev->srCache[i].object == in)
-                               dev->srCache[i].object = NULL;
+               existingTarget = yaffs_FindObjectByName(newDir, newName);
+               if (existingTarget &&
+                       existingTarget->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+                       !ylist_empty(&existingTarget->variant.directoryVariant.children)) {
+                       /* There is a target that is a non-empty directory, so we fail */
+                       return YAFFS_FAIL;      /* EEXIST or ENOTEMPTY */
+               } else if (existingTarget && existingTarget != obj) {
+                       /* Nuke the target first, using shadowing,
+                        * but only if it isn't the same object.
+                        *
+                        * Note we must disable gc otherwise it can mess up the shadowing.
+                        *
+                        */
+                       dev->gcDisable=1;
+                       yaffs_ChangeObjectName(obj, newDir, newName, force,
+                                               existingTarget->objectId);
+                       existingTarget->isShadowed = 1;
+                       yaffs_UnlinkObject(existingTarget);
+                       dev->gcDisable=0;
                }
+
+               result = yaffs_ChangeObjectName(obj, newDir, newName, 1, 0);
+
+               yaffs_UpdateParent(oldDir);
+               if(newDir != oldDir)
+                       yaffs_UpdateParent(newDir);
+               
+               return result;
        }
+       return YAFFS_FAIL;
 }
 
-/*--------------------- Checkpointing --------------------*/
-
+/*------------------------- Block Management and Page Allocation ----------------*/
 
-static int yaffs_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
+static int yaffs_InitialiseBlocks(yaffs_Device *dev)
 {
-       yaffs_CheckpointValidity cp;
+       int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
 
-       memset(&cp, 0, sizeof(cp));
+       dev->blockInfo = NULL;
+       dev->chunkBits = NULL;
 
-       cp.structType = sizeof(cp);
-       cp.magic = YAFFS_MAGIC;
-       cp.version = YAFFS_CHECKPOINT_VERSION;
-       cp.head = (head) ? 1 : 0;
+       dev->allocationBlock = -1;      /* force it to get a new one */
 
-       return (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
-               1 : 0;
-}
+       /* If the first allocation strategy fails, thry the alternate one */
+       dev->blockInfo = YMALLOC(nBlocks * sizeof(yaffs_BlockInfo));
+       if (!dev->blockInfo) {
+               dev->blockInfo = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockInfo));
+               dev->blockInfoAlt = 1;
+       } else
+               dev->blockInfoAlt = 0;
 
-static int yaffs_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
-{
-       yaffs_CheckpointValidity cp;
-       int ok;
+       if (dev->blockInfo) {
+               /* Set up dynamic blockinfo stuff. */
+               dev->chunkBitmapStride = (dev->param.nChunksPerBlock + 7) / 8; /* round up bytes */
+               dev->chunkBits = YMALLOC(dev->chunkBitmapStride * nBlocks);
+               if (!dev->chunkBits) {
+                       dev->chunkBits = YMALLOC_ALT(dev->chunkBitmapStride * nBlocks);
+                       dev->chunkBitsAlt = 1;
+               } else
+                       dev->chunkBitsAlt = 0;
+       }
 
-       ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+       if (dev->blockInfo && dev->chunkBits) {
+               memset(dev->blockInfo, 0, nBlocks * sizeof(yaffs_BlockInfo));
+               memset(dev->chunkBits, 0, dev->chunkBitmapStride * nBlocks);
+               return YAFFS_OK;
+       }
 
-       if (ok)
-               ok = (cp.structType == sizeof(cp)) &&
-                    (cp.magic == YAFFS_MAGIC) &&
-                    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
-                    (cp.head == ((head) ? 1 : 0));
-       return ok ? 1 : 0;
+       return YAFFS_FAIL;
 }
 
-static void yaffs_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
-                                          yaffs_Device *dev)
+static void yaffs_DeinitialiseBlocks(yaffs_Device *dev)
 {
-       cp->nErasedBlocks = dev->nErasedBlocks;
-       cp->allocationBlock = dev->allocationBlock;
-       cp->allocationPage = dev->allocationPage;
-       cp->nFreeChunks = dev->nFreeChunks;
+       if (dev->blockInfoAlt && dev->blockInfo)
+               YFREE_ALT(dev->blockInfo);
+       else if (dev->blockInfo)
+               YFREE(dev->blockInfo);
+
+       dev->blockInfoAlt = 0;
 
-       cp->nDeletedFiles = dev->nDeletedFiles;
-       cp->nUnlinkedFiles = dev->nUnlinkedFiles;
-       cp->nBackgroundDeletions = dev->nBackgroundDeletions;
-       cp->sequenceNumber = dev->sequenceNumber;
-       cp->oldestDirtySequence = dev->oldestDirtySequence;
+       dev->blockInfo = NULL;
 
+       if (dev->chunkBitsAlt && dev->chunkBits)
+               YFREE_ALT(dev->chunkBits);
+       else if (dev->chunkBits)
+               YFREE(dev->chunkBits);
+       dev->chunkBitsAlt = 0;
+       dev->chunkBits = NULL;
 }
 
-static void yaffs_CheckpointDeviceToDevice(yaffs_Device *dev,
-                                          yaffs_CheckpointDevice *cp)
+void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo)
 {
-       dev->nErasedBlocks = cp->nErasedBlocks;
-       dev->allocationBlock = cp->allocationBlock;
-       dev->allocationPage = cp->allocationPage;
-       dev->nFreeChunks = cp->nFreeChunks;
+       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, blockNo);
 
-       dev->nDeletedFiles = cp->nDeletedFiles;
-       dev->nUnlinkedFiles = cp->nUnlinkedFiles;
-       dev->nBackgroundDeletions = cp->nBackgroundDeletions;
-       dev->sequenceNumber = cp->sequenceNumber;
-       dev->oldestDirtySequence = cp->oldestDirtySequence;
-}
+       int erasedOk = 0;
 
+       /* If the block is still healthy erase it and mark as clean.
+        * If the block has had a data failure, then retire it.
+        */
 
-static int yaffs_WriteCheckpointDevice(yaffs_Device *dev)
-{
-       yaffs_CheckpointDevice cp;
-       __u32 nBytes;
-       __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+       T(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
+               (TSTR("yaffs_BlockBecameDirty block %d state %d %s"TENDSTR),
+               blockNo, bi->blockState, (bi->needsRetiring) ? "needs retiring" : ""));
 
-       int ok;
+       yaffs2_ClearOldestDirtySequence(dev,bi);
 
-       /* Write device runtime values*/
-       yaffs_DeviceToCheckpointDevice(&cp, dev);
-       cp.structType = sizeof(cp);
+       bi->blockState = YAFFS_BLOCK_STATE_DIRTY;
 
-       ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+       /* If this is the block being garbage collected then stop gc'ing this block */
+       if(blockNo == dev->gcBlock)
+               dev->gcBlock = 0;
+
+       /* If this block is currently the best candidate for gc then drop as a candidate */
+       if(blockNo == dev->gcDirtiest){
+               dev->gcDirtiest = 0;
+               dev->gcPagesInUse = 0;
+       }
 
-       /* Write block info */
-       if (ok) {
-               nBytes = nBlocks * sizeof(yaffs_BlockInfo);
-               ok = (yaffs_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
+       if (!bi->needsRetiring) {
+               yaffs2_InvalidateCheckpoint(dev);
+               erasedOk = yaffs_EraseBlockInNAND(dev, blockNo);
+               if (!erasedOk) {
+                       dev->nErasureFailures++;
+                       T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                         (TSTR("**>> Erasure failed %d" TENDSTR), blockNo));
+               }
        }
 
-       /* Write chunk bits */
-       if (ok) {
-               nBytes = nBlocks * dev->chunkBitmapStride;
-               ok = (yaffs_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
+       if (erasedOk &&
+           ((yaffs_traceMask & YAFFS_TRACE_ERASE) || !yaffs_SkipVerification(dev))) {
+               int i;
+               for (i = 0; i < dev->param.nChunksPerBlock; i++) {
+                       if (!yaffs_CheckChunkErased
+                           (dev, blockNo * dev->param.nChunksPerBlock + i)) {
+                               T(YAFFS_TRACE_ERROR,
+                                 (TSTR
+                                  (">>Block %d erasure supposedly OK, but chunk %d not erased"
+                                   TENDSTR), blockNo, i));
+                       }
+               }
        }
-       return   ok ? 1 : 0;
 
+       if (erasedOk) {
+               /* Clean it up... */
+               bi->blockState = YAFFS_BLOCK_STATE_EMPTY;
+               bi->sequenceNumber = 0;
+               dev->nErasedBlocks++;
+               bi->pagesInUse = 0;
+               bi->softDeletions = 0;
+               bi->hasShrinkHeader = 0;
+               bi->skipErasedCheck = 1;  /* This is clean, so no need to check */
+               bi->gcPrioritise = 0;
+               yaffs_ClearChunkBits(dev, blockNo);
+
+               T(YAFFS_TRACE_ERASE,
+                 (TSTR("Erased block %d" TENDSTR), blockNo));
+       } else {
+               dev->nFreeChunks -= dev->param.nChunksPerBlock; /* We lost a block of free space */
+
+               yaffs_RetireBlock(dev, blockNo);
+               T(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
+                 (TSTR("**>> Block %d retired" TENDSTR), blockNo));
+       }
 }
 
-static int yaffs_ReadCheckpointDevice(yaffs_Device *dev)
+static int yaffs_FindBlockForAllocation(yaffs_Device *dev)
 {
-       yaffs_CheckpointDevice cp;
-       __u32 nBytes;
-       __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
-
-       int ok;
+       int i;
 
-       ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
-       if (!ok)
-               return 0;
+       yaffs_BlockInfo *bi;
 
-       if (cp.structType != sizeof(cp))
-               return 0;
+       if (dev->nErasedBlocks < 1) {
+               /* Hoosterman we've got a problem.
+                * Can't get space to gc
+                */
+               T(YAFFS_TRACE_ERROR,
+                 (TSTR("yaffs tragedy: no more erased blocks" TENDSTR)));
 
+               return -1;
+       }
 
-       yaffs_CheckpointDeviceToDevice(dev, &cp);
+       /* Find an empty block. */
 
-       nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+               dev->allocationBlockFinder++;
+               if (dev->allocationBlockFinder < dev->internalStartBlock
+                   || dev->allocationBlockFinder > dev->internalEndBlock) {
+                       dev->allocationBlockFinder = dev->internalStartBlock;
+               }
 
-       ok = (yaffs_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
+               bi = yaffs_GetBlockInfo(dev, dev->allocationBlockFinder);
 
-       if (!ok)
-               return 0;
-       nBytes = nBlocks * dev->chunkBitmapStride;
+               if (bi->blockState == YAFFS_BLOCK_STATE_EMPTY) {
+                       bi->blockState = YAFFS_BLOCK_STATE_ALLOCATING;
+                       dev->sequenceNumber++;
+                       bi->sequenceNumber = dev->sequenceNumber;
+                       dev->nErasedBlocks--;
+                       T(YAFFS_TRACE_ALLOCATE,
+                         (TSTR("Allocated block %d, seq  %d, %d left" TENDSTR),
+                          dev->allocationBlockFinder, dev->sequenceNumber,
+                          dev->nErasedBlocks));
+                       return dev->allocationBlockFinder;
+               }
+       }
 
-       ok = (yaffs_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
+       T(YAFFS_TRACE_ALWAYS,
+         (TSTR
+          ("yaffs tragedy: no more erased blocks, but there should have been %d"
+           TENDSTR), dev->nErasedBlocks));
 
-       return ok ? 1 : 0;
+       return -1;
 }
 
-static void yaffs_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
-                                          yaffs_Object *obj)
+
+/*
+ * Check if there's space to allocate...
+ * Thinks.... do we need top make this ths same as yaffs_GetFreeChunks()?
+ */
+int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks)
 {
+       int reservedChunks;
+       int reservedBlocks = dev->param.nReservedBlocks;
+       int checkpointBlocks;
 
-       cp->objectId = obj->objectId;
-       cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
-       cp->hdrChunk = obj->hdrChunk;
-       cp->variantType = obj->variantType;
-       cp->deleted = obj->deleted;
-       cp->softDeleted = obj->softDeleted;
-       cp->unlinked = obj->unlinked;
-       cp->fake = obj->fake;
-       cp->renameAllowed = obj->renameAllowed;
-       cp->unlinkAllowed = obj->unlinkAllowed;
-       cp->serial = obj->serial;
-       cp->nDataChunks = obj->nDataChunks;
+       checkpointBlocks = yaffs2_CalcCheckpointBlocksRequired(dev);
 
-       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-               cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
-       else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-               cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
+       reservedChunks = ((reservedBlocks + checkpointBlocks) * dev->param.nChunksPerBlock);
+
+       return (dev->nFreeChunks > (reservedChunks + nChunks));
 }
 
-static int yaffs_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
+static int yaffs_AllocateChunk(yaffs_Device *dev, int useReserve,
+               yaffs_BlockInfo **blockUsedPtr)
 {
+       int retVal;
+       yaffs_BlockInfo *bi;
 
-       yaffs_Object *parent;
+       if (dev->allocationBlock < 0) {
+               /* Get next block to allocate off */
+               dev->allocationBlock = yaffs_FindBlockForAllocation(dev);
+               dev->allocationPage = 0;
+       }
 
-       if (obj->variantType != cp->variantType) {
-               T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
-                       TCONT("chunk %d does not match existing object type %d")
-                       TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
-                       obj->variantType));
-               return 0;
+       if (!useReserve && !yaffs_CheckSpaceForAllocation(dev, 1)) {
+               /* Not enough space to allocate unless we're allowed to use the reserve. */
+               return -1;
        }
 
-       obj->objectId = cp->objectId;
+       if (dev->nErasedBlocks < dev->param.nReservedBlocks
+                       && dev->allocationPage == 0) {
+               T(YAFFS_TRACE_ALLOCATE, (TSTR("Allocating reserve" TENDSTR)));
+       }
 
-       if (cp->parentId)
-               parent = yaffs_FindOrCreateObjectByNumber(
-                                       obj->myDev,
-                                       cp->parentId,
-                                       YAFFS_OBJECT_TYPE_DIRECTORY);
-       else
-               parent = NULL;
+       /* Next page please.... */
+       if (dev->allocationBlock >= 0) {
+               bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
 
-       if (parent) {
-               if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-                       T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
-                               TCONT(" chunk %d Parent type, %d, not directory")
-                               TENDSTR),
-                               cp->objectId, cp->parentId, cp->variantType,
-                               cp->hdrChunk, parent->variantType));
-                       return 0;
-               }
-               yaffs_AddObjectToDirectory(parent, obj);
-       }
+               retVal = (dev->allocationBlock * dev->param.nChunksPerBlock) +
+                       dev->allocationPage;
+               bi->pagesInUse++;
+               yaffs_SetChunkBit(dev, dev->allocationBlock,
+                               dev->allocationPage);
 
-       obj->hdrChunk = cp->hdrChunk;
-       obj->variantType = cp->variantType;
-       obj->deleted = cp->deleted;
-       obj->softDeleted = cp->softDeleted;
-       obj->unlinked = cp->unlinked;
-       obj->fake = cp->fake;
-       obj->renameAllowed = cp->renameAllowed;
-       obj->unlinkAllowed = cp->unlinkAllowed;
-       obj->serial = cp->serial;
-       obj->nDataChunks = cp->nDataChunks;
+               dev->allocationPage++;
 
-       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-               obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
-       else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
-               obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
+               dev->nFreeChunks--;
 
-       if (obj->hdrChunk > 0)
-               obj->lazyLoaded = 1;
-       return 1;
-}
+               /* If the block is full set the state to full */
+               if (dev->allocationPage >= dev->param.nChunksPerBlock) {
+                       bi->blockState = YAFFS_BLOCK_STATE_FULL;
+                       dev->allocationBlock = -1;
+               }
 
+               if (blockUsedPtr)
+                       *blockUsedPtr = bi;
 
+               return retVal;
+       }
 
-static int yaffs_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
-                                       __u32 level, int chunkOffset)
-{
-       int i;
-       yaffs_Device *dev = in->myDev;
-       int ok = 1;
-       int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+       T(YAFFS_TRACE_ERROR,
+                       (TSTR("!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!" TENDSTR)));
 
-       if (tnodeSize < sizeof(yaffs_Tnode))
-               tnodeSize = sizeof(yaffs_Tnode);
+       return -1;
+}
 
+static int yaffs_GetErasedChunks(yaffs_Device *dev)
+{
+       int n;
 
-       if (tn) {
-               if (level > 0) {
+       n = dev->nErasedBlocks * dev->param.nChunksPerBlock;
 
-                       for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
-                               if (tn->internal[i]) {
-                                       ok = yaffs_CheckpointTnodeWorker(in,
-                                                       tn->internal[i],
-                                                       level - 1,
-                                                       (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
-                               }
-                       }
-               } else if (level == 0) {
-                       __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
-                       ok = (yaffs_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
-                       if (ok)
-                               ok = (yaffs_CheckpointWrite(dev, tn, tnodeSize) == tnodeSize);
-               }
-       }
+       if (dev->allocationBlock > 0)
+               n += (dev->param.nChunksPerBlock - dev->allocationPage);
 
-       return ok;
+       return n;
 
 }
 
-static int yaffs_WriteCheckpointTnodes(yaffs_Object *obj)
+/*
+ * yaffs_SkipRestOfBlock() skips over the rest of the allocation block
+ * if we don't want to write to it.
+ */
+void yaffs_SkipRestOfBlock(yaffs_Device *dev)
 {
-       __u32 endMarker = ~0;
-       int ok = 1;
-
-       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-               ok = yaffs_CheckpointTnodeWorker(obj,
-                                           obj->variant.fileVariant.top,
-                                           obj->variant.fileVariant.topLevel,
-                                           0);
-               if (ok)
-                       ok = (yaffs_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
-                               sizeof(endMarker));
+       if(dev->allocationBlock > 0){
+               yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, dev->allocationBlock);
+               if(bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING){
+                       bi->blockState = YAFFS_BLOCK_STATE_FULL;
+                       dev->allocationBlock = -1;
+               }
        }
-
-       return ok ? 1 : 0;
 }
 
-static int yaffs_ReadCheckpointTnodes(yaffs_Object *obj)
-{
-       __u32 baseChunk;
-       int ok = 1;
-       yaffs_Device *dev = obj->myDev;
-       yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
-       yaffs_Tnode *tn;
-       int nread = 0;
-       int tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
 
-       if (tnodeSize < sizeof(yaffs_Tnode))
-               tnodeSize = sizeof(yaffs_Tnode);
+static int yaffs_GarbageCollectBlock(yaffs_Device *dev, int block,
+               int wholeBlock)
+{
+       int oldChunk;
+       int newChunk;
+       int markNAND;
+       int retVal = YAFFS_OK;
+       int i;
+       int isCheckpointBlock;
+       int matchingChunk;
+       int maxCopies;
 
-       ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+       int chunksBefore = yaffs_GetErasedChunks(dev);
+       int chunksAfter;
 
-       while (ok && (~baseChunk)) {
-               nread++;
-               /* Read level 0 tnode */
+       yaffs_ExtendedTags tags;
 
+       yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, block);
 
-               tn = yaffs_GetTnodeRaw(dev);
-               if (tn)
-                       ok = (yaffs_CheckpointRead(dev, tn, tnodeSize) == tnodeSize);
-               else
-                       ok = 0;
+       yaffs_Object *object;
 
-               if (tn && ok)
-                       ok = yaffs_AddOrFindLevel0Tnode(dev,
-                                                       fileStructPtr,
-                                                       baseChunk,
-                                                       tn) ? 1 : 0;
+       isCheckpointBlock = (bi->blockState == YAFFS_BLOCK_STATE_CHECKPOINT);
 
-               if (ok)
-                       ok = (yaffs_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
 
-       }
+       T(YAFFS_TRACE_TRACING,
+                       (TSTR("Collecting block %d, in use %d, shrink %d, wholeBlock %d" TENDSTR),
+                        block,
+                        bi->pagesInUse,
+                        bi->hasShrinkHeader,
+                        wholeBlock));
 
-       T(YAFFS_TRACE_CHECKPOINT, (
-               TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
-               nread, baseChunk, ok));
+       /*yaffs_VerifyFreeChunks(dev); */
 
-       return ok ? 1 : 0;
-}
+       if(bi->blockState == YAFFS_BLOCK_STATE_FULL)
+               bi->blockState = YAFFS_BLOCK_STATE_COLLECTING;
+       
+       bi->hasShrinkHeader = 0;        /* clear the flag so that the block can erase */
 
+       dev->gcDisable = 1;
 
-static int yaffs_WriteCheckpointObjects(yaffs_Device *dev)
-{
-       yaffs_Object *obj;
-       yaffs_CheckpointObject cp;
-       int i;
-       int ok = 1;
-       struct ylist_head *lh;
+       if (isCheckpointBlock ||
+                       !yaffs_StillSomeChunkBits(dev, block)) {
+               T(YAFFS_TRACE_TRACING,
+                               (TSTR
+                                ("Collecting block %d that has no chunks in use" TENDSTR),
+                                block));
+               yaffs_BlockBecameDirty(dev, block);
+       } else {
 
+               __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
 
-       /* Iterate through the objects in each hash entry,
-        * dumping them to the checkpointing stream.
-        */
+               yaffs_VerifyBlock(dev, bi, block);
 
-       for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
-               ylist_for_each(lh, &dev->objectBucket[i].list) {
-                       if (lh) {
-                               obj = ylist_entry(lh, yaffs_Object, hashLink);
-                               if (!obj->deferedFree) {
-                                       yaffs_ObjectToCheckpointObject(&cp, obj);
-                                       cp.structType = sizeof(cp);
-
-                                       T(YAFFS_TRACE_CHECKPOINT, (
-                                               TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %x" TENDSTR),
-                                               cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, (unsigned) obj));
+               maxCopies = (wholeBlock) ? dev->param.nChunksPerBlock : 5;
+               oldChunk = block * dev->param.nChunksPerBlock + dev->gcChunk;
 
-                                       ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+               for (/* init already done */;
+                    retVal == YAFFS_OK &&
+                    dev->gcChunk < dev->param.nChunksPerBlock &&
+                    (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) &&
+                    maxCopies > 0;
+                    dev->gcChunk++, oldChunk++) {
+                       if (yaffs_CheckChunkBit(dev, block, dev->gcChunk)) {
 
-                                       if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
-                                               ok = yaffs_WriteCheckpointTnodes(obj);
-                               }
-                       }
-               }
-       }
+                               /* This page is in use and might need to be copied off */
 
-       /* Dump end of list */
-       memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
-       cp.structType = sizeof(cp);
+                               maxCopies--;
 
-       if (ok)
-               ok = (yaffs_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+                               markNAND = 1;
 
-       return ok ? 1 : 0;
-}
+                               yaffs_InitialiseTags(&tags);
 
-static int yaffs_ReadCheckpointObjects(yaffs_Device *dev)
-{
-       yaffs_Object *obj;
-       yaffs_CheckpointObject cp;
-       int ok = 1;
-       int done = 0;
-       yaffs_Object *hardList = NULL;
+                               yaffs_ReadChunkWithTagsFromNAND(dev, oldChunk,
+                                                               buffer, &tags);
 
-       while (ok && !done) {
-               ok = (yaffs_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
-               if (cp.structType != sizeof(cp)) {
-                       T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
-                               cp.structType, sizeof(cp), ok));
-                       ok = 0;
-               }
-
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
-                       cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
-
-               if (ok && cp.objectId == ~0)
-                       done = 1;
-               else if (ok) {
-                       obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
-                       if (obj) {
-                               ok = yaffs_CheckpointObjectToObject(obj, &cp);
-                               if (!ok)
-                                       break;
-                               if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
-                                       ok = yaffs_ReadCheckpointTnodes(obj);
-                               } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-                                       obj->hardLinks.next =
-                                               (struct ylist_head *) hardList;
-                                       hardList = obj;
-                               }
-                       } else
-                               ok = 0;
-               }
-       }
+                               object =
+                                   yaffs_FindObjectByNumber(dev,
+                                                            tags.objectId);
 
-       if (ok)
-               yaffs_HardlinkFixup(dev, hardList);
+                               T(YAFFS_TRACE_GC_DETAIL,
+                                 (TSTR
+                                  ("Collecting chunk in block %d, %d %d %d " TENDSTR),
+                                  dev->gcChunk, tags.objectId, tags.chunkId,
+                                  tags.byteCount));
 
-       return ok ? 1 : 0;
-}
+                               if (object && !yaffs_SkipVerification(dev)) {
+                                       if (tags.chunkId == 0)
+                                               matchingChunk = object->hdrChunk;
+                                       else if (object->softDeleted)
+                                               matchingChunk = oldChunk; /* Defeat the test */
+                                       else
+                                               matchingChunk = yaffs_FindChunkInFile(object, tags.chunkId, NULL);
 
-static int yaffs_WriteCheckpointSum(yaffs_Device *dev)
-{
-       __u32 checkpointSum;
-       int ok;
+                                       if (oldChunk != matchingChunk)
+                                               T(YAFFS_TRACE_ERROR,
+                                                 (TSTR("gc: page in gc mismatch: %d %d %d %d"TENDSTR),
+                                                 oldChunk, matchingChunk, tags.objectId, tags.chunkId));
 
-       yaffs_GetCheckpointSum(dev, &checkpointSum);
+                               }
 
-       ok = (yaffs_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
+                               if (!object) {
+                                       T(YAFFS_TRACE_ERROR,
+                                         (TSTR
+                                          ("page %d in gc has no object: %d %d %d "
+                                           TENDSTR), oldChunk,
+                                           tags.objectId, tags.chunkId, tags.byteCount));
+                               }
 
-       if (!ok)
-               return 0;
+                               if (object &&
+                                   object->deleted &&
+                                   object->softDeleted &&
+                                   tags.chunkId != 0) {
+                                       /* Data chunk in a soft deleted file, throw it away
+                                        * It's a soft deleted data chunk,
+                                        * No need to copy this, just forget about it and
+                                        * fix up the object.
+                                        */
+                                        
+                                       /* Free chunks already includes softdeleted chunks.
+                                        * How ever this chunk is going to soon be really deleted
+                                        * which will increment free chunks.
+                                        * We have to decrement free chunks so this works out properly.
+                                        */
+                                       dev->nFreeChunks--;
+                                       bi->softDeletions--;
 
-       return 1;
-}
+                                       object->nDataChunks--;
 
-static int yaffs_ReadCheckpointSum(yaffs_Device *dev)
-{
-       __u32 checkpointSum0;
-       __u32 checkpointSum1;
-       int ok;
+                                       if (object->nDataChunks <= 0) {
+                                               /* remeber to clean up the object */
+                                               dev->gcCleanupList[dev->nCleanups] =
+                                                   tags.objectId;
+                                               dev->nCleanups++;
+                                       }
+                                       markNAND = 0;
+                               } else if (0) {
+                                       /* Todo object && object->deleted && object->nDataChunks == 0 */
+                                       /* Deleted object header with no data chunks.
+                                        * Can be discarded and the file deleted.
+                                        */
+                                       object->hdrChunk = 0;
+                                       yaffs_FreeTnode(object->myDev,
+                                                       object->variant.
+                                                       fileVariant.top);
+                                       object->variant.fileVariant.top = NULL;
+                                       yaffs_DoGenericObjectDeletion(object);
 
-       yaffs_GetCheckpointSum(dev, &checkpointSum0);
+                               } else if (object) {
+                                       /* It's either a data chunk in a live file or
+                                        * an ObjectHeader, so we're interested in it.
+                                        * NB Need to keep the ObjectHeaders of deleted files
+                                        * until the whole file has been deleted off
+                                        */
+                                       tags.serialNumber++;
 
-       ok = (yaffs_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+                                       dev->nGCCopies++;
 
-       if (!ok)
-               return 0;
+                                       if (tags.chunkId == 0) {
+                                               /* It is an object Id,
+                                                * We need to nuke the shrinkheader flags first
+                                                * Also need to clean up shadowing.
+                                                * We no longer want the shrinkHeader flag since its work is done
+                                                * and if it is left in place it will mess up scanning.
+                                                */
 
-       if (checkpointSum0 != checkpointSum1)
-               return 0;
+                                               yaffs_ObjectHeader *oh;
+                                               oh = (yaffs_ObjectHeader *)buffer;
 
-       return 1;
-}
+                                               oh->isShrink = 0;
+                                               tags.extraIsShrinkHeader = 0;
 
+                                               oh->shadowsObject = 0;
+                                               oh->inbandShadowsObject = 0;
+                                               tags.extraShadows = 0;
+
+                                               /* Update file size */
+                                               if(object->variantType == YAFFS_OBJECT_TYPE_FILE){
+                                                       oh->fileSize = object->variant.fileVariant.fileSize;
+                                                       tags.extraFileLength = oh->fileSize;
+                                               }
 
-static int yaffs_WriteCheckpointData(yaffs_Device *dev)
-{
-       int ok = 1;
+                                               yaffs_VerifyObjectHeader(object, oh, &tags, 1);
+                                               newChunk =
+                                                   yaffs_WriteNewChunkWithTagsToNAND(dev,(__u8 *) oh, &tags, 1);
+                                       } else
+                                               newChunk =
+                                                   yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &tags, 1);
 
-       if (dev->skipCheckpointWrite || !dev->isYaffs2) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
-               ok = 0;
-       }
+                                       if (newChunk < 0) {
+                                               retVal = YAFFS_FAIL;
+                                       } else {
 
-       if (ok)
-               ok = yaffs_CheckpointOpen(dev, 1);
+                                               /* Ok, now fix up the Tnodes etc. */
 
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
-               ok = yaffs_WriteCheckpointValidityMarker(dev, 1);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
-               ok = yaffs_WriteCheckpointDevice(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
-               ok = yaffs_WriteCheckpointObjects(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
-               ok = yaffs_WriteCheckpointValidityMarker(dev, 0);
-       }
+                                               if (tags.chunkId == 0) {
+                                                       /* It's a header */
+                                                       object->hdrChunk =  newChunk;
+                                                       object->serial =   tags.serialNumber;
+                                               } else {
+                                                       /* It's a data chunk */
+                                                       int ok;
+                                                       ok = yaffs_PutChunkIntoFile
+                                                           (object,
+                                                            tags.chunkId,
+                                                            newChunk, 0);
+                                               }
+                                       }
+                               }
 
-       if (ok)
-               ok = yaffs_WriteCheckpointSum(dev);
+                               if (retVal == YAFFS_OK)
+                                       yaffs_DeleteChunk(dev, oldChunk, markNAND, __LINE__);
 
-       if (!yaffs_CheckpointClose(dev))
-               ok = 0;
+                       }
+               }
 
-       if (ok)
-               dev->isCheckpointed = 1;
-       else
-               dev->isCheckpointed = 0;
+               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
 
-       return dev->isCheckpointed;
-}
 
-static int yaffs_ReadCheckpointData(yaffs_Device *dev)
-{
-       int ok = 1;
 
-       if (dev->skipCheckpointRead || !dev->isYaffs2) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
-               ok = 0;
        }
 
-       if (ok)
-               ok = yaffs_CheckpointOpen(dev, 0); /* open for read */
-
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
-               ok = yaffs_ReadCheckpointValidityMarker(dev, 1);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
-               ok = yaffs_ReadCheckpointDevice(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
-               ok = yaffs_ReadCheckpointObjects(dev);
-       }
-       if (ok) {
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
-               ok = yaffs_ReadCheckpointValidityMarker(dev, 0);
-       }
+       yaffs_VerifyCollectedBlock(dev, bi, block);
 
-       if (ok) {
-               ok = yaffs_ReadCheckpointSum(dev);
-               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
-       }
 
-       if (!yaffs_CheckpointClose(dev))
-               ok = 0;
 
-       if (ok)
-               dev->isCheckpointed = 1;
-       else
-               dev->isCheckpointed = 0;
+       if (bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+               /*
+                * The gc did not complete. Set block state back to FULL
+                * because checkpointing does not restore gc.
+                */
+               bi->blockState = YAFFS_BLOCK_STATE_FULL;
+       } else {
+               /* The gc completed. */
+               /* Do any required cleanups */
+               for (i = 0; i < dev->nCleanups; i++) {
+                       /* Time to delete the file too */
+                       object =
+                           yaffs_FindObjectByNumber(dev,
+                                                    dev->gcCleanupList[i]);
+                       if (object) {
+                               yaffs_FreeTnode(dev,
+                                               object->variant.fileVariant.
+                                               top);
+                               object->variant.fileVariant.top = NULL;
+                               T(YAFFS_TRACE_GC,
+                                 (TSTR
+                                  ("yaffs: About to finally delete object %d"
+                                   TENDSTR), object->objectId));
+                               yaffs_DoGenericObjectDeletion(object);
+                               object->myDev->nDeletedFiles--;
+                       }
 
-       return ok ? 1 : 0;
+               }
 
-}
 
-static void yaffs_InvalidateCheckpoint(yaffs_Device *dev)
-{
-       if (dev->isCheckpointed ||
-                       dev->blocksInCheckpoint > 0) {
-               dev->isCheckpointed = 0;
-               yaffs_CheckpointInvalidateStream(dev);
-               if (dev->superBlock && dev->markSuperBlockDirty)
-                       dev->markSuperBlockDirty(dev->superBlock);
+               chunksAfter = yaffs_GetErasedChunks(dev);
+               if (chunksBefore >= chunksAfter) {
+                       T(YAFFS_TRACE_GC,
+                         (TSTR
+                          ("gc did not increase free chunks before %d after %d"
+                           TENDSTR), chunksBefore, chunksAfter));
+               }
+               dev->gcBlock = 0;
+               dev->gcChunk = 0;
+               dev->nCleanups = 0;
        }
-}
 
+       dev->gcDisable = 0;
 
-int yaffs_CheckpointSave(yaffs_Device *dev)
-{
-
-       T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+       return retVal;
+}
 
-       yaffs_VerifyObjects(dev);
-       yaffs_VerifyBlocks(dev);
-       yaffs_VerifyFreeChunks(dev);
+/*
+ * FindBlockForgarbageCollection is used to select the dirtiest block (or close enough)
+ * for garbage collection.
+ */
 
-       if (!dev->isCheckpointed) {
-               yaffs_InvalidateCheckpoint(dev);
-               yaffs_WriteCheckpointData(dev);
-       }
+static unsigned yaffs_FindBlockForGarbageCollection(yaffs_Device *dev,
+                                       int aggressive,
+                                       int background)
+{
+       int i;
+       int iterations;
+       unsigned selected = 0;
+       int prioritised = 0;
+       int prioritisedExists = 0;
+       yaffs_BlockInfo *bi;
+       int threshold;
 
-       T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+       /* First let's see if we need to grab a prioritised block */
+       if (dev->hasPendingPrioritisedGCs && !aggressive) {
+               dev->gcDirtiest = 0;
+               bi = dev->blockInfo;
+               for (i = dev->internalStartBlock;
+                       i <= dev->internalEndBlock && !selected;
+                       i++) {
 
-       return dev->isCheckpointed;
-}
+                       if (bi->gcPrioritise) {
+                               prioritisedExists = 1;
+                               if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+                                  yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
+                                       selected = i;
+                                       prioritised = 1;
+                               }
+                       }
+                       bi++;
+               }
 
-int yaffs_CheckpointRestore(yaffs_Device *dev)
-{
-       int retval;
-       T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+               /*
+                * If there is a prioritised block and none was selected then
+                * this happened because there is at least one old dirty block gumming
+                * up the works. Let's gc the oldest dirty block.
+                */
 
-       retval = yaffs_ReadCheckpointData(dev);
+               if(prioritisedExists &&
+                       !selected &&
+                       dev->oldestDirtyBlock > 0)
+                       selected = dev->oldestDirtyBlock;
 
-       if (dev->isCheckpointed) {
-               yaffs_VerifyObjects(dev);
-               yaffs_VerifyBlocks(dev);
-               yaffs_VerifyFreeChunks(dev);
+               if (!prioritisedExists) /* None found, so we can clear this */
+                       dev->hasPendingPrioritisedGCs = 0;
        }
 
-       T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+       /* If we're doing aggressive GC then we are happy to take a less-dirty block, and
+        * search harder.
+        * else (we're doing a leasurely gc), then we only bother to do this if the
+        * block has only a few pages in use.
+        */
 
-       return retval;
-}
+       if (!selected){
+               int pagesUsed;
+               int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+               if (aggressive){
+                       threshold = dev->param.nChunksPerBlock;
+                       iterations = nBlocks;
+               } else {
+                       int maxThreshold;
 
-/*--------------------- File read/write ------------------------
- * Read and write have very similar structures.
- * In general the read/write has three parts to it
- * An incomplete chunk to start with (if the read/write is not chunk-aligned)
- * Some complete chunks
- * An incomplete chunk to end off with
- *
- * Curve-balls: the first chunk might also be the last chunk.
- */
+                       if(background)
+                               maxThreshold = dev->param.nChunksPerBlock/2;
+                       else
+                               maxThreshold = dev->param.nChunksPerBlock/8;
 
-int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
-                       int nBytes)
-{
+                       if(maxThreshold <  YAFFS_GC_PASSIVE_THRESHOLD)
+                               maxThreshold = YAFFS_GC_PASSIVE_THRESHOLD;
 
-       int chunk;
-       __u32 start;
-       int nToCopy;
-       int n = nBytes;
-       int nDone = 0;
-       yaffs_ChunkCache *cache;
+                       threshold = background ?
+                               (dev->gcNotDone + 2) * 2 : 0;
+                       if(threshold <YAFFS_GC_PASSIVE_THRESHOLD)
+                               threshold = YAFFS_GC_PASSIVE_THRESHOLD;
+                       if(threshold > maxThreshold)
+                               threshold = maxThreshold;
 
-       yaffs_Device *dev;
+                       iterations = nBlocks / 16 + 1;
+                       if (iterations > 100)
+                               iterations = 100;
+               }
 
-       dev = in->myDev;
+               for (i = 0;
+                       i < iterations &&
+                       (dev->gcDirtiest < 1 ||
+                               dev->gcPagesInUse > YAFFS_GC_GOOD_ENOUGH);
+                       i++) {
+                       dev->gcBlockFinder++;
+                       if (dev->gcBlockFinder < dev->internalStartBlock ||
+                               dev->gcBlockFinder > dev->internalEndBlock)
+                               dev->gcBlockFinder = dev->internalStartBlock;
 
-       while (n > 0) {
-               /* chunk = offset / dev->nDataBytesPerChunk + 1; */
-               /* start = offset % dev->nDataBytesPerChunk; */
-               yaffs_AddrToChunk(dev, offset, &chunk, &start);
-               chunk++;
+                       bi = yaffs_GetBlockInfo(dev, dev->gcBlockFinder);
 
-               /* OK now check for the curveball where the start and end are in
-                * the same chunk.
-                */
-               if ((start + n) < dev->nDataBytesPerChunk)
-                       nToCopy = n;
-               else
-                       nToCopy = dev->nDataBytesPerChunk - start;
+                       pagesUsed = bi->pagesInUse - bi->softDeletions;
 
-               cache = yaffs_FindChunkCache(in, chunk);
+                       if (bi->blockState == YAFFS_BLOCK_STATE_FULL &&
+                               pagesUsed < dev->param.nChunksPerBlock &&
+                               (dev->gcDirtiest < 1 || pagesUsed < dev->gcPagesInUse) &&
+                               yaffs2_BlockNotDisqualifiedFromGC(dev, bi)) {
+                               dev->gcDirtiest = dev->gcBlockFinder;
+                               dev->gcPagesInUse = pagesUsed;
+                       }
+               }
 
-               /* If the chunk is already in the cache or it is less than a whole chunk
-                * or we're using inband tags then use the cache (if there is caching)
-                * else bypass the cache.
-                */
-               if (cache || nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
-                       if (dev->nShortOpCaches > 0) {
+               if(dev->gcDirtiest > 0 && dev->gcPagesInUse <= threshold)
+                       selected = dev->gcDirtiest;
+       }
+
+       /*
+        * If nothing has been selected for a while, try selecting the oldest dirty
+        * because that's gumming up the works.
+        */
 
-                               /* If we can't find the data in the cache, then load it up. */
+       if(!selected && dev->param.isYaffs2 &&
+               dev->gcNotDone >= ( background ? 10 : 20)){
+               yaffs2_FindOldestDirtySequence(dev);
+               if(dev->oldestDirtyBlock > 0) {
+                       selected = dev->oldestDirtyBlock;
+                       dev->gcDirtiest = selected;
+                       dev->oldestDirtyGCs++;
+                       bi = yaffs_GetBlockInfo(dev, selected);
+                       dev->gcPagesInUse =  bi->pagesInUse - bi->softDeletions;
+               } else
+                       dev->gcNotDone = 0;
+       }
 
-                               if (!cache) {
-                                       cache = yaffs_GrabChunkCache(in->myDev);
-                                       cache->object = in;
-                                       cache->chunkId = chunk;
-                                       cache->dirty = 0;
-                                       cache->locked = 0;
-                                       yaffs_ReadChunkDataFromObject(in, chunk,
-                                                                     cache->
-                                                                     data);
-                                       cache->nBytes = 0;
-                               }
+       if(selected){
+               T(YAFFS_TRACE_GC,
+                 (TSTR("GC Selected block %d with %d free, prioritised:%d" TENDSTR),
+                 selected,
+                 dev->param.nChunksPerBlock - dev->gcPagesInUse,
+                 prioritised));
+
+               dev->nGCBlocks++;
+               if(background)
+                       dev->backgroundGCs++;
+
+               dev->gcDirtiest = 0;
+               dev->gcPagesInUse = 0;
+               dev->gcNotDone = 0;
+               if(dev->refreshSkip > 0)
+                       dev->refreshSkip--;
+       } else{
+               dev->gcNotDone++;
+               T(YAFFS_TRACE_GC,
+                 (TSTR("GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s" TENDSTR),
+                 dev->gcBlockFinder, dev->gcNotDone,
+                 threshold,
+                 dev->gcDirtiest, dev->gcPagesInUse,
+                 dev->oldestDirtyBlock,
+                 background ? " bg" : ""));
+       }
 
-                               yaffs_UseChunkCache(dev, cache, 0);
+       return selected;
+}
 
-                               cache->locked = 1;
+/* New garbage collector
+ * If we're very low on erased blocks then we do aggressive garbage collection
+ * otherwise we do "leasurely" garbage collection.
+ * Aggressive gc looks further (whole array) and will accept less dirty blocks.
+ * Passive gc only inspects smaller areas and will only accept more dirty blocks.
+ *
+ * The idea is to help clear out space in a more spread-out manner.
+ * Dunno if it really does anything useful.
+ */
+static int yaffs_CheckGarbageCollection(yaffs_Device *dev, int background)
+{
+       int aggressive = 0;
+       int gcOk = YAFFS_OK;
+       int maxTries = 0;
+       int minErased;
+       int erasedChunks;
+       int checkpointBlockAdjust;
 
+       if(dev->param.gcControl &&
+               (dev->param.gcControl(dev) & 1) == 0)
+               return YAFFS_OK;
 
-                               memcpy(buffer, &cache->data[start], nToCopy);
+       if (dev->gcDisable) {
+               /* Bail out so we don't get recursive gc */
+               return YAFFS_OK;
+       }
 
-                               cache->locked = 0;
-                       } else {
-                               /* Read into the local buffer then copy..*/
+       /* This loop should pass the first time.
+        * We'll only see looping here if the collection does not increase space.
+        */
 
-                               __u8 *localBuffer =
-                                   yaffs_GetTempBuffer(dev, __LINE__);
-                               yaffs_ReadChunkDataFromObject(in, chunk,
-                                                             localBuffer);
+       do {
+               maxTries++;
 
-                               memcpy(buffer, &localBuffer[start], nToCopy);
+               checkpointBlockAdjust = yaffs2_CalcCheckpointBlocksRequired(dev);
 
+               minErased  = dev->param.nReservedBlocks + checkpointBlockAdjust + 1;
+               erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
 
-                               yaffs_ReleaseTempBuffer(dev, localBuffer,
-                                                       __LINE__);
+               /* If we need a block soon then do aggressive gc.*/
+               if (dev->nErasedBlocks < minErased)
+                       aggressive = 1;
+               else {
+                       if(!background && erasedChunks > (dev->nFreeChunks / 4))
+                               break;
+
+                       if(dev->gcSkip > 20)
+                               dev->gcSkip = 20;
+                       if(erasedChunks < dev->nFreeChunks/2 ||
+                               dev->gcSkip < 1 ||
+                               background)
+                               aggressive = 0;
+                       else {
+                               dev->gcSkip--;
+                               break;
                        }
+               }
 
-               } else {
+               dev->gcSkip = 5;
 
-                       /* A full chunk. Read directly into the supplied buffer. */
-                       yaffs_ReadChunkDataFromObject(in, chunk, buffer);
+                /* If we don't already have a block being gc'd then see if we should start another */
 
+               if (dev->gcBlock < 1 && !aggressive) {
+                       dev->gcBlock = yaffs2_FindRefreshBlock(dev);
+                       dev->gcChunk = 0;
+                       dev->nCleanups=0;
+               }
+               if (dev->gcBlock < 1) {
+                       dev->gcBlock = yaffs_FindBlockForGarbageCollection(dev, aggressive, background);
+                       dev->gcChunk = 0;
+                       dev->nCleanups=0;
                }
 
-               n -= nToCopy;
-               offset += nToCopy;
-               buffer += nToCopy;
-               nDone += nToCopy;
+               if (dev->gcBlock > 0) {
+                       dev->allGCs++;
+                       if (!aggressive)
+                               dev->passiveGCs++;
 
-       }
+                       T(YAFFS_TRACE_GC,
+                         (TSTR
+                          ("yaffs: GC erasedBlocks %d aggressive %d" TENDSTR),
+                          dev->nErasedBlocks, aggressive));
 
-       return nDone;
+                       gcOk = yaffs_GarbageCollectBlock(dev, dev->gcBlock, aggressive);
+               }
+
+               if (dev->nErasedBlocks < (dev->param.nReservedBlocks) && dev->gcBlock > 0) {
+                       T(YAFFS_TRACE_GC,
+                         (TSTR
+                          ("yaffs: GC !!!no reclaim!!! erasedBlocks %d after try %d block %d"
+                           TENDSTR), dev->nErasedBlocks, maxTries, dev->gcBlock));
+               }
+       } while ((dev->nErasedBlocks < dev->param.nReservedBlocks) &&
+                (dev->gcBlock > 0) &&
+                (maxTries < 2));
+
+       return aggressive ? gcOk : YAFFS_OK;
 }
 
-int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
-                       int nBytes, int writeThrough)
+/*
+ * yaffs_BackgroundGarbageCollect()
+ * Garbage collects. Intended to be called from a background thread.
+ * Returns non-zero if at least half the free chunks are erased.
+ */
+int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency)
 {
+       int erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
 
-       int chunk;
-       __u32 start;
-       int nToCopy;
-       int n = nBytes;
-       int nDone = 0;
-       int nToWriteBack;
-       int startOfWrite = offset;
-       int chunkWritten = 0;
-       __u32 nBytesRead;
-       __u32 chunkStart;
+       T(YAFFS_TRACE_BACKGROUND, (TSTR("Background gc %u" TENDSTR),urgency));
 
-       yaffs_Device *dev;
+       yaffs_CheckGarbageCollection(dev, 1);
+       return erasedChunks > dev->nFreeChunks/2;
+}
 
-       dev = in->myDev;
+/*-------------------------  TAGS --------------------------------*/
 
-       while (n > 0 && chunkWritten >= 0) {
-               /* chunk = offset / dev->nDataBytesPerChunk + 1; */
-               /* start = offset % dev->nDataBytesPerChunk; */
-               yaffs_AddrToChunk(dev, offset, &chunk, &start);
+static int yaffs_TagsMatch(const yaffs_ExtendedTags *tags, int objectId,
+                          int chunkInObject)
+{
+       return (tags->chunkId == chunkInObject &&
+               tags->objectId == objectId && !tags->chunkDeleted) ? 1 : 0;
 
-               if (chunk * dev->nDataBytesPerChunk + start != offset ||
-                               start >= dev->nDataBytesPerChunk) {
-                       T(YAFFS_TRACE_ERROR, (
-                          TSTR("AddrToChunk of offset %d gives chunk %d start %d"
-                          TENDSTR),
-                          (int)offset, chunk, start));
-               }
-               chunk++;
+}
 
-               /* OK now check for the curveball where the start and end are in
-                * the same chunk.
-                */
 
-               if ((start + n) < dev->nDataBytesPerChunk) {
-                       nToCopy = n;
+/*-------------------- Data file manipulation -----------------*/
 
-                       /* Now folks, to calculate how many bytes to write back....
-                        * If we're overwriting and not writing to then end of file then
-                        * we need to write back as much as was there before.
-                        */
+static int yaffs_FindChunkInFile(yaffs_Object *in, int chunkInInode,
+                                yaffs_ExtendedTags *tags)
+{
+       /*Get the Tnode, then get the level 0 offset chunk offset */
+       yaffs_Tnode *tn;
+       int theChunk = -1;
+       yaffs_ExtendedTags localTags;
+       int retVal = -1;
 
-                       chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
+       yaffs_Device *dev = in->myDev;
 
-                       if (chunkStart > in->variant.fileVariant.fileSize)
-                               nBytesRead = 0; /* Past end of file */
-                       else
-                               nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
+       if (!tags) {
+               /* Passed a NULL, so use our own tags space */
+               tags = &localTags;
+       }
 
-                       if (nBytesRead > dev->nDataBytesPerChunk)
-                               nBytesRead = dev->nDataBytesPerChunk;
+       tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
 
-                       nToWriteBack =
-                           (nBytesRead >
-                            (start + n)) ? nBytesRead : (start + n);
+       if (tn) {
+               theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
 
-                       if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
-                               YBUG();
+               retVal =
+                   yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+                                          chunkInInode);
+       }
+       return retVal;
+}
 
-               } else {
-                       nToCopy = dev->nDataBytesPerChunk - start;
-                       nToWriteBack = dev->nDataBytesPerChunk;
-               }
+static int yaffs_FindAndDeleteChunkInFile(yaffs_Object *in, int chunkInInode,
+                                         yaffs_ExtendedTags *tags)
+{
+       /* Get the Tnode, then get the level 0 offset chunk offset */
+       yaffs_Tnode *tn;
+       int theChunk = -1;
+       yaffs_ExtendedTags localTags;
 
-               if (nToCopy != dev->nDataBytesPerChunk || dev->inbandTags) {
-                       /* An incomplete start or end chunk (or maybe both start and end chunk),
-                        * or we're using inband tags, so we want to use the cache buffers.
-                        */
-                       if (dev->nShortOpCaches > 0) {
-                               yaffs_ChunkCache *cache;
-                               /* If we can't find the data in the cache, then load the cache */
-                               cache = yaffs_FindChunkCache(in, chunk);
+       yaffs_Device *dev = in->myDev;
+       int retVal = -1;
 
-                               if (!cache
-                                   && yaffs_CheckSpaceForAllocation(in->
-                                                                    myDev)) {
-                                       cache = yaffs_GrabChunkCache(in->myDev);
-                                       cache->object = in;
-                                       cache->chunkId = chunk;
-                                       cache->dirty = 0;
-                                       cache->locked = 0;
-                                       yaffs_ReadChunkDataFromObject(in, chunk,
-                                                                     cache->
-                                                                     data);
-                               } else if (cache &&
-                                       !cache->dirty &&
-                                       !yaffs_CheckSpaceForAllocation(in->myDev)) {
-                                       /* Drop the cache if it was a read cache item and
-                                        * no space check has been made for it.
-                                        */
-                                        cache = NULL;
-                               }
+       if (!tags) {
+               /* Passed a NULL, so use our own tags space */
+               tags = &localTags;
+       }
 
-                               if (cache) {
-                                       yaffs_UseChunkCache(dev, cache, 1);
-                                       cache->locked = 1;
+       tn = yaffs_FindLevel0Tnode(dev, &in->variant.fileVariant, chunkInInode);
 
+       if (tn) {
 
-                                       memcpy(&cache->data[start], buffer,
-                                              nToCopy);
+               theChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
 
+               retVal =
+                   yaffs_FindChunkInGroup(dev, theChunk, tags, in->objectId,
+                                          chunkInInode);
 
-                                       cache->locked = 0;
-                                       cache->nBytes = nToWriteBack;
+               /* Delete the entry in the filestructure (if found) */
+               if (retVal != -1)
+                       yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, 0);
+       }
 
-                                       if (writeThrough) {
-                                               chunkWritten =
-                                                   yaffs_WriteChunkDataToObject
-                                                   (cache->object,
-                                                    cache->chunkId,
-                                                    cache->data, cache->nBytes,
-                                                    1);
-                                               cache->dirty = 0;
-                                       }
+       return retVal;
+}
 
-                               } else {
-                                       chunkWritten = -1;      /* fail the write */
-                               }
-                       } else {
-                               /* An incomplete start or end chunk (or maybe both start and end chunk)
-                                * Read into the local buffer then copy, then copy over and write back.
-                                */
 
-                               __u8 *localBuffer =
-                                   yaffs_GetTempBuffer(dev, __LINE__);
+int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
+                               int chunkInNAND, int inScan)
+{
+       /* NB inScan is zero unless scanning.
+        * For forward scanning, inScan is > 0;
+        * for backward scanning inScan is < 0
+        *
+        * chunkInNAND = 0 is a dummy insert to make sure the tnodes are there.
+        */
+
+       yaffs_Tnode *tn;
+       yaffs_Device *dev = in->myDev;
+       int existingChunk;
+       yaffs_ExtendedTags existingTags;
+       yaffs_ExtendedTags newTags;
+       unsigned existingSerial, newSerial;
+
+       if (in->variantType != YAFFS_OBJECT_TYPE_FILE) {
+               /* Just ignore an attempt at putting a chunk into a non-file during scanning
+                * If it is not during Scanning then something went wrong!
+                */
+               if (!inScan) {
+                       T(YAFFS_TRACE_ERROR,
+                         (TSTR
+                          ("yaffs tragedy:attempt to put data chunk into a non-file"
+                           TENDSTR)));
+                       YBUG();
+               }
 
-                               yaffs_ReadChunkDataFromObject(in, chunk,
-                                                             localBuffer);
+               yaffs_DeleteChunk(dev, chunkInNAND, 1, __LINE__);
+               return YAFFS_OK;
+       }
 
+       tn = yaffs_AddOrFindLevel0Tnode(dev,
+                                       &in->variant.fileVariant,
+                                       chunkInInode,
+                                       NULL);
+       if (!tn)
+               return YAFFS_FAIL;
+       
+       if(!chunkInNAND)
+               /* Dummy insert, bail now */
+               return YAFFS_OK;
 
+       existingChunk = yaffs_GetChunkGroupBase(dev, tn, chunkInInode);
 
-                               memcpy(&localBuffer[start], buffer, nToCopy);
+       if (inScan != 0) {
+               /* If we're scanning then we need to test for duplicates
+                * NB This does not need to be efficient since it should only ever
+                * happen when the power fails during a write, then only one
+                * chunk should ever be affected.
+                *
+                * Correction for YAFFS2: This could happen quite a lot and we need to think about efficiency! TODO
+                * Update: For backward scanning we don't need to re-read tags so this is quite cheap.
+                */
 
-                               chunkWritten =
-                                   yaffs_WriteChunkDataToObject(in, chunk,
-                                                                localBuffer,
-                                                                nToWriteBack,
-                                                                0);
+               if (existingChunk > 0) {
+                       /* NB Right now existing chunk will not be real chunkId if the chunk group size > 1
+                        *    thus we have to do a FindChunkInFile to get the real chunk id.
+                        *
+                        * We have a duplicate now we need to decide which one to use:
+                        *
+                        * Backwards scanning YAFFS2: The old one is what we use, dump the new one.
+                        * Forward scanning YAFFS2: The new one is what we use, dump the old one.
+                        * YAFFS1: Get both sets of tags and compare serial numbers.
+                        */
 
-                               yaffs_ReleaseTempBuffer(dev, localBuffer,
-                                                       __LINE__);
+                       if (inScan > 0) {
+                               /* Only do this for forward scanning */
+                               yaffs_ReadChunkWithTagsFromNAND(dev,
+                                                               chunkInNAND,
+                                                               NULL, &newTags);
 
+                               /* Do a proper find */
+                               existingChunk =
+                                   yaffs_FindChunkInFile(in, chunkInInode,
+                                                         &existingTags);
                        }
 
-               } else {
-                       /* A full chunk. Write directly from the supplied buffer. */
+                       if (existingChunk <= 0) {
+                               /*Hoosterman - how did this happen? */
 
+                               T(YAFFS_TRACE_ERROR,
+                                 (TSTR
+                                  ("yaffs tragedy: existing chunk < 0 in scan"
+                                   TENDSTR)));
 
+                       }
 
-                       chunkWritten =
-                           yaffs_WriteChunkDataToObject(in, chunk, buffer,
-                                                        dev->nDataBytesPerChunk,
-                                                        0);
+                       /* NB The deleted flags should be false, otherwise the chunks will
+                        * not be loaded during a scan
+                        */
 
-                       /* Since we've overwritten the cached data, we better invalidate it. */
-                       yaffs_InvalidateChunkCache(in, chunk);
-               }
+                       if (inScan > 0) {
+                               newSerial = newTags.serialNumber;
+                               existingSerial = existingTags.serialNumber;
+                       }
 
-               if (chunkWritten >= 0) {
-                       n -= nToCopy;
-                       offset += nToCopy;
-                       buffer += nToCopy;
-                       nDone += nToCopy;
+                       if ((inScan > 0) &&
+                           (existingChunk <= 0 ||
+                            ((existingSerial + 1) & 3) == newSerial)) {
+                               /* Forward scanning.
+                                * Use new
+                                * Delete the old one and drop through to update the tnode
+                                */
+                               yaffs_DeleteChunk(dev, existingChunk, 1,
+                                                 __LINE__);
+                       } else {
+                               /* Backward scanning or we want to use the existing one
+                                * Use existing.
+                                * Delete the new one and return early so that the tnode isn't changed
+                                */
+                               yaffs_DeleteChunk(dev, chunkInNAND, 1,
+                                                 __LINE__);
+                               return YAFFS_OK;
+                       }
                }
 
        }
 
-       /* Update file object */
-
-       if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
-               in->variant.fileVariant.fileSize = (startOfWrite + nDone);
+       if (existingChunk == 0)
+               in->nDataChunks++;
 
-       in->dirty = 1;
+       yaffs_LoadLevel0Tnode(dev, tn, chunkInInode, chunkInNAND);
 
-       return nDone;
+       return YAFFS_OK;
 }
 
+static int yaffs_ReadChunkDataFromObject(yaffs_Object *in, int chunkInInode,
+                                       __u8 *buffer)
+{
+       int chunkInNAND = yaffs_FindChunkInFile(in, chunkInInode, NULL);
 
-/* ---------------------- File resizing stuff ------------------ */
+       if (chunkInNAND >= 0)
+               return yaffs_ReadChunkWithTagsFromNAND(in->myDev, chunkInNAND,
+                                               buffer, NULL);
+       else {
+               T(YAFFS_TRACE_NANDACCESS,
+                 (TSTR("Chunk %d not found zero instead" TENDSTR),
+                  chunkInNAND));
+               /* get sane (zero) data if you read a hole */
+               memset(buffer, 0, in->myDev->nDataBytesPerChunk);
+               return 0;
+       }
 
-static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
-{
+}
 
-       yaffs_Device *dev = in->myDev;
-       int oldFileSize = in->variant.fileVariant.fileSize;
+void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn)
+{
+       int block;
+       int page;
+       yaffs_ExtendedTags tags;
+       yaffs_BlockInfo *bi;
 
-       int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
+       if (chunkId <= 0)
+               return;
 
-       int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
-           dev->nDataBytesPerChunk;
-       int i;
-       int chunkId;
+       dev->nDeletions++;
+       block = chunkId / dev->param.nChunksPerBlock;
+       page = chunkId % dev->param.nChunksPerBlock;
 
-       /* Delete backwards so that we don't end up with holes if
-        * power is lost part-way through the operation.
-        */
-       for (i = lastDel; i >= startDel; i--) {
-               /* NB this could be optimised somewhat,
-                * eg. could retrieve the tags and write them without
-                * using yaffs_DeleteChunk
-                */
 
-               chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
-               if (chunkId > 0) {
-                       if (chunkId <
-                           (dev->internalStartBlock * dev->nChunksPerBlock)
-                           || chunkId >=
-                           ((dev->internalEndBlock +
-                             1) * dev->nChunksPerBlock)) {
-                               T(YAFFS_TRACE_ALWAYS,
-                                 (TSTR("Found daft chunkId %d for %d" TENDSTR),
-                                  chunkId, i));
-                       } else {
-                               in->nDataChunks--;
-                               yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
-                       }
-               }
-       }
+       if (!yaffs_CheckChunkBit(dev, block, page))
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Deleting invalid chunk %d"TENDSTR),
+                        chunkId));
 
-}
+       bi = yaffs_GetBlockInfo(dev, block);
+       
+       yaffs2_UpdateOldestDirtySequence(dev, block, bi);
 
-int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
-{
+       T(YAFFS_TRACE_DELETION,
+         (TSTR("line %d delete of chunk %d" TENDSTR), lyn, chunkId));
 
-       int oldFileSize = in->variant.fileVariant.fileSize;
-       __u32 newSizeOfPartialChunk;
-       int newFullChunks;
+       if (!dev->param.isYaffs2 && markNAND &&
+           bi->blockState != YAFFS_BLOCK_STATE_COLLECTING) {
 
-       yaffs_Device *dev = in->myDev;
+               yaffs_InitialiseTags(&tags);
 
-       yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
+               tags.chunkDeleted = 1;
 
-       yaffs_FlushFilesChunkCache(in);
-       yaffs_InvalidateWholeChunkCache(in);
+               yaffs_WriteChunkWithTagsToNAND(dev, chunkId, NULL, &tags);
+               yaffs_HandleUpdateChunk(dev, chunkId, &tags);
+       } else {
+               dev->nUnmarkedDeletions++;
+       }
 
-       yaffs_CheckGarbageCollection(dev);
+       /* Pull out of the management area.
+        * If the whole block became dirty, this will kick off an erasure.
+        */
+       if (bi->blockState == YAFFS_BLOCK_STATE_ALLOCATING ||
+           bi->blockState == YAFFS_BLOCK_STATE_FULL ||
+           bi->blockState == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+           bi->blockState == YAFFS_BLOCK_STATE_COLLECTING) {
+               dev->nFreeChunks++;
 
-       if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
-               return YAFFS_FAIL;
+               yaffs_ClearChunkBit(dev, block, page);
 
-       if (newSize == oldFileSize)
-               return YAFFS_OK;
+               bi->pagesInUse--;
 
-       if (newSize < oldFileSize) {
+               if (bi->pagesInUse == 0 &&
+                   !bi->hasShrinkHeader &&
+                   bi->blockState != YAFFS_BLOCK_STATE_ALLOCATING &&
+                   bi->blockState != YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+                       yaffs_BlockBecameDirty(dev, block);
+               }
 
-               yaffs_PruneResizedChunks(in, newSize);
+       }
 
-               if (newSizeOfPartialChunk != 0) {
-                       int lastChunk = 1 + newFullChunks;
+}
 
-                       __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
+static int yaffs_WriteChunkDataToObject(yaffs_Object *in, int chunkInInode,
+                                       const __u8 *buffer, int nBytes,
+                                       int useReserve)
+{
+       /* Find old chunk Need to do this to get serial number
+        * Write new one and patch into tree.
+        * Invalidate old tags.
+        */
 
-                       /* Got to read and rewrite the last chunk with its new size and zero pad */
-                       yaffs_ReadChunkDataFromObject(in, lastChunk,
-                                                     localBuffer);
+       int prevChunkId;
+       yaffs_ExtendedTags prevTags;
 
-                       memset(localBuffer + newSizeOfPartialChunk, 0,
-                              dev->nDataBytesPerChunk - newSizeOfPartialChunk);
+       int newChunkId;
+       yaffs_ExtendedTags newTags;
 
-                       yaffs_WriteChunkDataToObject(in, lastChunk, localBuffer,
-                                                    newSizeOfPartialChunk, 1);
+       yaffs_Device *dev = in->myDev;
 
-                       yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
-               }
+       yaffs_CheckGarbageCollection(dev,0);
 
-               in->variant.fileVariant.fileSize = newSize;
+       /* Get the previous chunk at this location in the file if it exists.
+        * If it does not exist then put a zero into the tree. This creates
+        * the tnode now, rather than later when it is harder to clean up.
+        */
+       prevChunkId = yaffs_FindChunkInFile(in, chunkInInode, &prevTags);
+       if(prevChunkId < 1 &&
+               !yaffs_PutChunkIntoFile(in, chunkInInode, 0, 0))
+               return 0;
 
-               yaffs_PruneFileStructure(dev, &in->variant.fileVariant);
-       } else {
-               /* newsSize > oldFileSize */
-               in->variant.fileVariant.fileSize = newSize;
-       }
+       /* Set up new tags */
+       yaffs_InitialiseTags(&newTags);
 
+       newTags.chunkId = chunkInInode;
+       newTags.objectId = in->objectId;
+       newTags.serialNumber =
+           (prevChunkId > 0) ? prevTags.serialNumber + 1 : 1;
+       newTags.byteCount = nBytes;
 
-       /* Write a new object header.
-        * show we've shrunk the file, if need be
-        * Do this only if the file is not in the deleted directories.
-        */
-       if (in->parent &&
-           in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
-           in->parent->objectId != YAFFS_OBJECTID_DELETED)
-               yaffs_UpdateObjectHeader(in, NULL, 0,
-                                        (newSize < oldFileSize) ? 1 : 0, 0);
+       if (nBytes < 1 || nBytes > dev->param.totalBytesPerChunk) {
+               T(YAFFS_TRACE_ERROR,
+               (TSTR("Writing %d bytes to chunk!!!!!!!!!" TENDSTR), nBytes));
+               YBUG();
+       }
+       
+               
+       newChunkId =
+           yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+                                             useReserve);
 
-       return YAFFS_OK;
-}
+       if (newChunkId > 0) {
+               yaffs_PutChunkIntoFile(in, chunkInInode, newChunkId, 0);
 
-loff_t yaffs_GetFileSize(yaffs_Object *obj)
-{
-       obj = yaffs_GetEquivalentObject(obj);
+               if (prevChunkId > 0)
+                       yaffs_DeleteChunk(dev, prevChunkId, 1, __LINE__);
 
-       switch (obj->variantType) {
-       case YAFFS_OBJECT_TYPE_FILE:
-               return obj->variant.fileVariant.fileSize;
-       case YAFFS_OBJECT_TYPE_SYMLINK:
-               return yaffs_strlen(obj->variant.symLinkVariant.alias);
-       default:
-               return 0;
+               yaffs_VerifyFileSanity(in);
        }
+       return newChunkId;
+
 }
 
+/* UpdateObjectHeader updates the header on NAND for an object.
+ * If name is not NULL, then that new name is used.
+ */
+int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name, int force,
+                            int isShrink, int shadows, yaffs_XAttrMod *xmod)
+{
 
+       yaffs_BlockInfo *bi;
 
-int yaffs_FlushFile(yaffs_Object *in, int updateTime)
-{
-       int retVal;
-       if (in->dirty) {
-               yaffs_FlushFilesChunkCache(in);
-               if (updateTime) {
-#ifdef CONFIG_YAFFS_WINCE
-                       yfsd_WinFileTimeNow(in->win_mtime);
-#else
+       yaffs_Device *dev = in->myDev;
 
-                       in->yst_mtime = Y_CURRENT_TIME;
+       int prevChunkId;
+       int retVal = 0;
+       int result = 0;
 
-#endif
-               }
+       int newChunkId;
+       yaffs_ExtendedTags newTags;
+       yaffs_ExtendedTags oldTags;
+       const YCHAR *alias = NULL;
 
-               retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0) >=
-                       0) ? YAFFS_OK : YAFFS_FAIL;
-       } else {
-               retVal = YAFFS_OK;
-       }
+       __u8 *buffer = NULL;
+       YCHAR oldName[YAFFS_MAX_NAME_LENGTH + 1];
 
-       return retVal;
+       yaffs_ObjectHeader *oh = NULL;
 
-}
+       yaffs_strcpy(oldName, _Y("silly old name"));
 
-static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
-{
 
-       /* First off, invalidate the file's data in the cache, without flushing. */
-       yaffs_InvalidateWholeChunkCache(in);
+       if (!in->fake ||
+               in == dev->rootDir || /* The rootDir should also be saved */
+               force  || xmod) {
 
-       if (in->myDev->isYaffs2 && (in->parent != in->myDev->deletedDir)) {
-               /* Move to the unlinked directory so we have a record that it was deleted. */
-               yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
+               yaffs_CheckGarbageCollection(dev,0);
+               yaffs_CheckObjectDetailsLoaded(in);
 
-       }
+               buffer = yaffs_GetTempBuffer(in->myDev, __LINE__);
+               oh = (yaffs_ObjectHeader *) buffer;
 
-       yaffs_RemoveObjectFromDirectory(in);
-       yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
-       in->hdrChunk = 0;
+               prevChunkId = in->hdrChunk;
 
-       yaffs_FreeObject(in);
-       return YAFFS_OK;
+               if (prevChunkId > 0) {
+                       result = yaffs_ReadChunkWithTagsFromNAND(dev, prevChunkId,
+                                                       buffer, &oldTags);
 
-}
+                       yaffs_VerifyObjectHeader(in, oh, &oldTags, 0);
 
-/* yaffs_DeleteFile deletes the whole file data
- * and the inode associated with the file.
- * It does not delete the links associated with the file.
- */
-static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
-{
+                       memcpy(oldName, oh->name, sizeof(oh->name));
+                       memset(buffer, 0xFF, sizeof(yaffs_ObjectHeader));
+               } else
+                       memset(buffer, 0xFF, dev->nDataBytesPerChunk);
 
-       int retVal;
-       int immediateDeletion = 0;
+               oh->type = in->variantType;
+               oh->yst_mode = in->yst_mode;
+               oh->shadowsObject = oh->inbandShadowsObject = shadows;
 
-#ifdef __KERNEL__
-       if (!in->myInode)
-               immediateDeletion = 1;
+#ifdef CONFIG_YAFFS_WINCE
+               oh->win_atime[0] = in->win_atime[0];
+               oh->win_ctime[0] = in->win_ctime[0];
+               oh->win_mtime[0] = in->win_mtime[0];
+               oh->win_atime[1] = in->win_atime[1];
+               oh->win_ctime[1] = in->win_ctime[1];
+               oh->win_mtime[1] = in->win_mtime[1];
 #else
-       if (in->inUse <= 0)
-               immediateDeletion = 1;
+               oh->yst_uid = in->yst_uid;
+               oh->yst_gid = in->yst_gid;
+               oh->yst_atime = in->yst_atime;
+               oh->yst_mtime = in->yst_mtime;
+               oh->yst_ctime = in->yst_ctime;
+               oh->yst_rdev = in->yst_rdev;
 #endif
+               if (in->parent)
+                       oh->parentObjectId = in->parent->objectId;
+               else
+                       oh->parentObjectId = 0;
 
-       if (immediateDeletion) {
-               retVal =
-                   yaffs_ChangeObjectName(in, in->myDev->deletedDir,
-                                          _Y("deleted"), 0, 0);
-               T(YAFFS_TRACE_TRACING,
-                 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
-                  in->objectId));
-               in->deleted = 1;
-               in->myDev->nDeletedFiles++;
-               if (1 || in->myDev->isYaffs2)
-                       yaffs_ResizeFile(in, 0);
-               yaffs_SoftDeleteFile(in);
-       } else {
-               retVal =
-                   yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
-                                          _Y("unlinked"), 0, 0);
-       }
+               if (name && *name) {
+                       memset(oh->name, 0, sizeof(oh->name));
+                       yaffs_LoadObjectHeaderFromName(dev,oh->name,name);
+               } else if (prevChunkId > 0)
+                       memcpy(oh->name, oldName, sizeof(oh->name));
+               else
+                       memset(oh->name, 0, sizeof(oh->name));
 
+               oh->isShrink = isShrink;
 
-       return retVal;
-}
+               switch (in->variantType) {
+               case YAFFS_OBJECT_TYPE_UNKNOWN:
+                       /* Should not happen */
+                       break;
+               case YAFFS_OBJECT_TYPE_FILE:
+                       oh->fileSize =
+                           (oh->parentObjectId == YAFFS_OBJECTID_DELETED
+                            || oh->parentObjectId ==
+                            YAFFS_OBJECTID_UNLINKED) ? 0 : in->variant.
+                           fileVariant.fileSize;
+                       break;
+               case YAFFS_OBJECT_TYPE_HARDLINK:
+                       oh->equivalentObjectId =
+                           in->variant.hardLinkVariant.equivalentObjectId;
+                       break;
+               case YAFFS_OBJECT_TYPE_SPECIAL:
+                       /* Do nothing */
+                       break;
+               case YAFFS_OBJECT_TYPE_DIRECTORY:
+                       /* Do nothing */
+                       break;
+               case YAFFS_OBJECT_TYPE_SYMLINK:
+                       alias = in->variant.symLinkVariant.alias;
+                       if(!alias)
+                               alias = _Y("no alias");
+                       yaffs_strncpy(oh->alias,
+                                       alias,
+                                     YAFFS_MAX_ALIAS_LENGTH);
+                       oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
+                       break;
+               }
 
-int yaffs_DeleteFile(yaffs_Object *in)
-{
-       int retVal = YAFFS_OK;
-       int deleted = in->deleted;
+               /* process any xattrib modifications */
+               if(xmod)
+                       yaffs_ApplyXMod(in, (char *)buffer, xmod);
 
-       yaffs_ResizeFile(in, 0);
 
-       if (in->nDataChunks > 0) {
-               /* Use soft deletion if there is data in the file.
-                * That won't be the case if it has been resized to zero.
-                */
-               if (!in->unlinked)
-                       retVal = yaffs_UnlinkFileIfNeeded(in);
+               /* Tags */
+               yaffs_InitialiseTags(&newTags);
+               in->serial++;
+               newTags.chunkId = 0;
+               newTags.objectId = in->objectId;
+               newTags.serialNumber = in->serial;
 
-               if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
-                       in->deleted = 1;
-                       deleted = 1;
-                       in->myDev->nDeletedFiles++;
-                       yaffs_SoftDeleteFile(in);
-               }
-               return deleted ? YAFFS_OK : YAFFS_FAIL;
-       } else {
-               /* The file has no data chunks so we toss it immediately */
-               yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
-               in->variant.fileVariant.top = NULL;
-               yaffs_DoGenericObjectDeletion(in);
+               /* Add extra info for file header */
 
-               return YAFFS_OK;
-       }
-}
+               newTags.extraHeaderInfoAvailable = 1;
+               newTags.extraParentObjectId = oh->parentObjectId;
+               newTags.extraFileLength = oh->fileSize;
+               newTags.extraIsShrinkHeader = oh->isShrink;
+               newTags.extraEquivalentObjectId = oh->equivalentObjectId;
+               newTags.extraShadows = (oh->shadowsObject > 0) ? 1 : 0;
+               newTags.extraObjectType = in->variantType;
 
-static int yaffs_DeleteDirectory(yaffs_Object *in)
-{
-       /* First check that the directory is empty. */
-       if (ylist_empty(&in->variant.directoryVariant.children))
-               return yaffs_DoGenericObjectDeletion(in);
+               yaffs_VerifyObjectHeader(in, oh, &newTags, 1);
 
-       return YAFFS_FAIL;
+               /* Create new chunk in NAND */
+               newChunkId =
+                   yaffs_WriteNewChunkWithTagsToNAND(dev, buffer, &newTags,
+                                                     (prevChunkId > 0) ? 1 : 0);
 
-}
+               if (newChunkId >= 0) {
 
-static int yaffs_DeleteSymLink(yaffs_Object *in)
-{
-       YFREE(in->variant.symLinkVariant.alias);
+                       in->hdrChunk = newChunkId;
 
-       return yaffs_DoGenericObjectDeletion(in);
-}
+                       if (prevChunkId > 0) {
+                               yaffs_DeleteChunk(dev, prevChunkId, 1,
+                                                 __LINE__);
+                       }
 
-static int yaffs_DeleteHardLink(yaffs_Object *in)
-{
-       /* remove this hardlink from the list assocaited with the equivalent
-        * object
-        */
-       ylist_del_init(&in->hardLinks);
-       return yaffs_DoGenericObjectDeletion(in);
-}
+                       if (!yaffs_ObjectHasCachedWriteData(in))
+                               in->dirty = 0;
+
+                       /* If this was a shrink, then mark the block that the chunk lives on */
+                       if (isShrink) {
+                               bi = yaffs_GetBlockInfo(in->myDev,
+                                       newChunkId / in->myDev->param.nChunksPerBlock);
+                               bi->hasShrinkHeader = 1;
+                       }
+
+               }
+
+               retVal = newChunkId;
 
-int yaffs_DeleteObject(yaffs_Object *obj)
-{
-int retVal = -1;
-       switch (obj->variantType) {
-       case YAFFS_OBJECT_TYPE_FILE:
-               retVal = yaffs_DeleteFile(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_DIRECTORY:
-               return yaffs_DeleteDirectory(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SYMLINK:
-               retVal = yaffs_DeleteSymLink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_HARDLINK:
-               retVal = yaffs_DeleteHardLink(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_SPECIAL:
-               retVal = yaffs_DoGenericObjectDeletion(obj);
-               break;
-       case YAFFS_OBJECT_TYPE_UNKNOWN:
-               retVal = 0;
-               break;          /* should not happen. */
        }
 
+       if (buffer)
+               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+
        return retVal;
 }
 
-static int yaffs_UnlinkWorker(yaffs_Object *obj)
+/*------------------------ Short Operations Cache ----------------------------------------
+ *   In many situations where there is no high level buffering (eg WinCE) a lot of
+ *   reads might be short sequential reads, and a lot of writes may be short
+ *   sequential writes. eg. scanning/writing a jpeg file.
+ *   In these cases, a short read/write cache can provide a huge perfomance benefit
+ *   with dumb-as-a-rock code.
+ *   In Linux, the page cache provides read buffering aand the short op cache provides write
+ *   buffering.
+ *
+ *   There are a limited number (~10) of cache chunks per device so that we don't
+ *   need a very intelligent search.
+ */
+
+static int yaffs_ObjectHasCachedWriteData(yaffs_Object *obj)
 {
+       yaffs_Device *dev = obj->myDev;
+       int i;
+       yaffs_ChunkCache *cache;
+       int nCaches = obj->myDev->param.nShortOpCaches;
 
-       int immediateDeletion = 0;
+       for (i = 0; i < nCaches; i++) {
+               cache = &dev->srCache[i];
+               if (cache->object == obj &&
+                   cache->dirty)
+                       return 1;
+       }
 
-#ifdef __KERNEL__
-       if (!obj->myInode)
-               immediateDeletion = 1;
-#else
-       if (obj->inUse <= 0)
-               immediateDeletion = 1;
-#endif
+       return 0;
+}
 
-       if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
-               return yaffs_DeleteHardLink(obj);
-       } else if (!ylist_empty(&obj->hardLinks)) {
-               /* Curve ball: We're unlinking an object that has a hardlink.
-                *
-                * This problem arises because we are not strictly following
-                * The Linux link/inode model.
-                *
-                * We can't really delete the object.
-                * Instead, we do the following:
-                * - Select a hardlink.
-                * - Unhook it from the hard links
-                * - Unhook it from its parent directory (so that the rename can work)
-                * - Rename the object to the hardlink's name.
-                * - Delete the hardlink
-                */
 
-               yaffs_Object *hl;
-               int retVal;
-               YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
+static void yaffs_FlushFilesChunkCache(yaffs_Object *obj)
+{
+       yaffs_Device *dev = obj->myDev;
+       int lowest = -99;       /* Stop compiler whining. */
+       int i;
+       yaffs_ChunkCache *cache;
+       int chunkWritten = 0;
+       int nCaches = obj->myDev->param.nShortOpCaches;
 
-               hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
+       if (nCaches > 0) {
+               do {
+                       cache = NULL;
 
-               ylist_del_init(&hl->hardLinks);
-               ylist_del_init(&hl->siblings);
+                       /* Find the dirty cache for this object with the lowest chunk id. */
+                       for (i = 0; i < nCaches; i++) {
+                               if (dev->srCache[i].object == obj &&
+                                   dev->srCache[i].dirty) {
+                                       if (!cache
+                                           || dev->srCache[i].chunkId <
+                                           lowest) {
+                                               cache = &dev->srCache[i];
+                                               lowest = cache->chunkId;
+                                       }
+                               }
+                       }
 
-               yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+                       if (cache && !cache->locked) {
+                               /* Write it out and free it up */
 
-               retVal = yaffs_ChangeObjectName(obj, hl->parent, name, 0, 0);
+                               chunkWritten =
+                                   yaffs_WriteChunkDataToObject(cache->object,
+                                                                cache->chunkId,
+                                                                cache->data,
+                                                                cache->nBytes,
+                                                                1);
+                               cache->dirty = 0;
+                               cache->object = NULL;
+                       }
 
-               if (retVal == YAFFS_OK)
-                       retVal = yaffs_DoGenericObjectDeletion(hl);
+               } while (cache && chunkWritten > 0);
 
-               return retVal;
+               if (cache) {
+                       /* Hoosterman, disk full while writing cache out. */
+                       T(YAFFS_TRACE_ERROR,
+                         (TSTR("yaffs tragedy: no space during cache write" TENDSTR)));
 
-       } else if (immediateDeletion) {
-               switch (obj->variantType) {
-               case YAFFS_OBJECT_TYPE_FILE:
-                       return yaffs_DeleteFile(obj);
-                       break;
-               case YAFFS_OBJECT_TYPE_DIRECTORY:
-                       return yaffs_DeleteDirectory(obj);
-                       break;
-               case YAFFS_OBJECT_TYPE_SYMLINK:
-                       return yaffs_DeleteSymLink(obj);
-                       break;
-               case YAFFS_OBJECT_TYPE_SPECIAL:
-                       return yaffs_DoGenericObjectDeletion(obj);
-                       break;
-               case YAFFS_OBJECT_TYPE_HARDLINK:
-               case YAFFS_OBJECT_TYPE_UNKNOWN:
-               default:
-                       return YAFFS_FAIL;
                }
-       } else
-               return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
-                                          _Y("unlinked"), 0, 0);
+       }
+
 }
 
+/*yaffs_FlushEntireDeviceCache(dev)
+ *
+ *
+ */
 
-static int yaffs_UnlinkObject(yaffs_Object *obj)
+void yaffs_FlushEntireDeviceCache(yaffs_Device *dev)
 {
+       yaffs_Object *obj;
+       int nCaches = dev->param.nShortOpCaches;
+       int i;
 
-       if (obj && obj->unlinkAllowed)
-               return yaffs_UnlinkWorker(obj);
+       /* Find a dirty object in the cache and flush it...
+        * until there are no further dirty objects.
+        */
+       do {
+               obj = NULL;
+               for (i = 0; i < nCaches && !obj; i++) {
+                       if (dev->srCache[i].object &&
+                           dev->srCache[i].dirty)
+                               obj = dev->srCache[i].object;
 
-       return YAFFS_FAIL;
+               }
+               if (obj)
+                       yaffs_FlushFilesChunkCache(obj);
+
+       } while (obj);
 
 }
-int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+
+
+/* Grab us a cache chunk for use.
+ * First look for an empty one.
+ * Then look for the least recently used non-dirty one.
+ * Then look for the least recently used dirty one...., flush and look again.
+ */
+static yaffs_ChunkCache *yaffs_GrabChunkCacheWorker(yaffs_Device *dev)
 {
-       yaffs_Object *obj;
+       int i;
 
-       obj = yaffs_FindObjectByName(dir, name);
-       return yaffs_UnlinkObject(obj);
-}
+       if (dev->param.nShortOpCaches > 0) {
+               for (i = 0; i < dev->param.nShortOpCaches; i++) {
+                       if (!dev->srCache[i].object)
+                               return &dev->srCache[i];
+               }
+       }
 
-/*----------------------- Initialisation Scanning ---------------------- */
+       return NULL;
+}
 
-static void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
-                               int backwardScanning)
+static yaffs_ChunkCache *yaffs_GrabChunkCache(yaffs_Device *dev)
 {
-       yaffs_Object *obj;
+       yaffs_ChunkCache *cache;
+       yaffs_Object *theObj;
+       int usage;
+       int i;
+       int pushout;
 
-       if (!backwardScanning) {
-               /* Handle YAFFS1 forward scanning case
-                * For YAFFS1 we always do the deletion
-                */
+       if (dev->param.nShortOpCaches > 0) {
+               /* Try find a non-dirty one... */
 
-       } else {
-               /* Handle YAFFS2 case (backward scanning)
-                * If the shadowed object exists then ignore.
-                */
-               if (yaffs_FindObjectByNumber(dev, objId))
-                       return;
-       }
+               cache = yaffs_GrabChunkCacheWorker(dev);
 
-       /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
-        * We put it in unlinked dir to be cleaned up after the scanning
-        */
-       obj =
-           yaffs_FindOrCreateObjectByNumber(dev, objId,
-                                            YAFFS_OBJECT_TYPE_FILE);
-       if (!obj)
-               return;
-       yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
-       obj->variant.fileVariant.shrinkSize = 0;
-       obj->valid = 1;         /* So that we don't read any other info for this file */
+               if (!cache) {
+                       /* They were all dirty, find the last recently used object and flush
+                        * its cache, then  find again.
+                        * NB what's here is not very accurate, we actually flush the object
+                        * the last recently used page.
+                        */
 
-}
+                       /* With locking we can't assume we can use entry zero */
 
-typedef struct {
-       int seq;
-       int block;
-} yaffs_BlockIndex;
+                       theObj = NULL;
+                       usage = -1;
+                       cache = NULL;
+                       pushout = -1;
 
+                       for (i = 0; i < dev->param.nShortOpCaches; i++) {
+                               if (dev->srCache[i].object &&
+                                   !dev->srCache[i].locked &&
+                                   (dev->srCache[i].lastUse < usage || !cache)) {
+                                       usage = dev->srCache[i].lastUse;
+                                       theObj = dev->srCache[i].object;
+                                       cache = &dev->srCache[i];
+                                       pushout = i;
+                               }
+                       }
 
-static void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
-{
-       yaffs_Object *hl;
-       yaffs_Object *in;
+                       if (!cache || cache->dirty) {
+                               /* Flush and try again */
+                               yaffs_FlushFilesChunkCache(theObj);
+                               cache = yaffs_GrabChunkCacheWorker(dev);
+                       }
 
-       while (hardList) {
-               hl = hardList;
-               hardList = (yaffs_Object *) (hardList->hardLinks.next);
+               }
+               return cache;
+       } else
+               return NULL;
 
-               in = yaffs_FindObjectByNumber(dev,
-                                             hl->variant.hardLinkVariant.
-                                             equivalentObjectId);
+}
 
-               if (in) {
-                       /* Add the hardlink pointers */
-                       hl->variant.hardLinkVariant.equivalentObject = in;
-                       ylist_add(&hl->hardLinks, &in->hardLinks);
-               } else {
-                       /* Todo Need to report/handle this better.
-                        * Got a problem... hardlink to a non-existant object
-                        */
-                       hl->variant.hardLinkVariant.equivalentObject = NULL;
-                       YINIT_LIST_HEAD(&hl->hardLinks);
+/* Find a cached chunk */
+static yaffs_ChunkCache *yaffs_FindChunkCache(const yaffs_Object *obj,
+                                             int chunkId)
+{
+       yaffs_Device *dev = obj->myDev;
+       int i;
+       if (dev->param.nShortOpCaches > 0) {
+               for (i = 0; i < dev->param.nShortOpCaches; i++) {
+                       if (dev->srCache[i].object == obj &&
+                           dev->srCache[i].chunkId == chunkId) {
+                               dev->cacheHits++;
 
+                               return &dev->srCache[i];
+                       }
                }
        }
+       return NULL;
 }
 
+/* Mark the chunk for the least recently used algorithym */
+static void yaffs_UseChunkCache(yaffs_Device *dev, yaffs_ChunkCache *cache,
+                               int isAWrite)
+{
+
+       if (dev->param.nShortOpCaches > 0) {
+               if (dev->srLastUse < 0 || dev->srLastUse > 100000000) {
+                       /* Reset the cache usages */
+                       int i;
+                       for (i = 1; i < dev->param.nShortOpCaches; i++)
+                               dev->srCache[i].lastUse = 0;
 
+                       dev->srLastUse = 0;
+               }
 
+               dev->srLastUse++;
 
+               cache->lastUse = dev->srLastUse;
 
-static int ybicmp(const void *a, const void *b)
-{
-       register int aseq = ((yaffs_BlockIndex *)a)->seq;
-       register int bseq = ((yaffs_BlockIndex *)b)->seq;
-       register int ablock = ((yaffs_BlockIndex *)a)->block;
-       register int bblock = ((yaffs_BlockIndex *)b)->block;
-       if (aseq == bseq)
-               return ablock - bblock;
-       else
-               return aseq - bseq;
+               if (isAWrite)
+                       cache->dirty = 1;
+       }
 }
 
+/* Invalidate a single cache page.
+ * Do this when a whole page gets written,
+ * ie the short cache for this page is no longer valid.
+ */
+static void yaffs_InvalidateChunkCache(yaffs_Object *object, int chunkId)
+{
+       if (object->myDev->param.nShortOpCaches > 0) {
+               yaffs_ChunkCache *cache = yaffs_FindChunkCache(object, chunkId);
 
-struct yaffs_ShadowFixerStruct {
-       int objectId;
-       int shadowedId;
-       struct yaffs_ShadowFixerStruct *next;
-};
-
+               if (cache)
+                       cache->object = NULL;
+       }
+}
 
-static void yaffs_StripDeletedObjects(yaffs_Device *dev)
+/* Invalidate all the cache pages associated with this object
+ * Do this whenever ther file is deleted or resized.
+ */
+static void yaffs_InvalidateWholeChunkCache(yaffs_Object *in)
 {
-       /*
-       *  Sort out state of unlinked and deleted objects after scanning.
-       */
-       struct ylist_head *i;
-       struct ylist_head *n;
-       yaffs_Object *l;
+       int i;
+       yaffs_Device *dev = in->myDev;
 
-       /* Soft delete all the unlinked files */
-       ylist_for_each_safe(i, n,
-               &dev->unlinkedDir->variant.directoryVariant.children) {
-               if (i) {
-                       l = ylist_entry(i, yaffs_Object, siblings);
-                       yaffs_DeleteObject(l);
+       if (dev->param.nShortOpCaches > 0) {
+               /* Invalidate it. */
+               for (i = 0; i < dev->param.nShortOpCaches; i++) {
+                       if (dev->srCache[i].object == in)
+                               dev->srCache[i].object = NULL;
                }
        }
+}
 
-       ylist_for_each_safe(i, n,
-               &dev->deletedDir->variant.directoryVariant.children) {
-               if (i) {
-                       l = ylist_entry(i, yaffs_Object, siblings);
-                       yaffs_DeleteObject(l);
-               }
-       }
 
-}
+/*--------------------- File read/write ------------------------
+ * Read and write have very similar structures.
+ * In general the read/write has three parts to it
+ * An incomplete chunk to start with (if the read/write is not chunk-aligned)
+ * Some complete chunks
+ * An incomplete chunk to end off with
+ *
+ * Curve-balls: the first chunk might also be the last chunk.
+ */
 
-static int yaffs_Scan(yaffs_Device *dev)
+int yaffs_ReadDataFromFile(yaffs_Object *in, __u8 *buffer, loff_t offset,
+                       int nBytes)
 {
-       yaffs_ExtendedTags tags;
-       int blk;
-       int blockIterator;
-       int startIterator;
-       int endIterator;
-       int result;
 
        int chunk;
-       int c;
-       int deleted;
-       yaffs_BlockState state;
-       yaffs_Object *hardList = NULL;
-       yaffs_BlockInfo *bi;
-       __u32 sequenceNumber;
-       yaffs_ObjectHeader *oh;
-       yaffs_Object *in;
-       yaffs_Object *parent;
-
-       int alloc_failed = 0;
+       __u32 start;
+       int nToCopy;
+       int n = nBytes;
+       int nDone = 0;
+       yaffs_ChunkCache *cache;
 
-       struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
+       yaffs_Device *dev;
 
+       dev = in->myDev;
 
-       __u8 *chunkData;
+       while (n > 0) {
+               /* chunk = offset / dev->nDataBytesPerChunk + 1; */
+               /* start = offset % dev->nDataBytesPerChunk; */
+               yaffs_AddrToChunk(dev, offset, &chunk, &start);
+               chunk++;
 
+               /* OK now check for the curveball where the start and end are in
+                * the same chunk.
+                */
+               if ((start + n) < dev->nDataBytesPerChunk)
+                       nToCopy = n;
+               else
+                       nToCopy = dev->nDataBytesPerChunk - start;
 
+               cache = yaffs_FindChunkCache(in, chunk);
 
-       T(YAFFS_TRACE_SCAN,
-         (TSTR("yaffs_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
-          dev->internalStartBlock, dev->internalEndBlock));
-
-       chunkData = yaffs_GetTempBuffer(dev, __LINE__);
-
-       dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
-       /* Scan all the blocks to determine their state */
-       for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
-               bi = yaffs_GetBlockInfo(dev, blk);
-               yaffs_ClearChunkBits(dev, blk);
-               bi->pagesInUse = 0;
-               bi->softDeletions = 0;
+               /* If the chunk is already in the cache or it is less than a whole chunk
+                * or we're using inband tags then use the cache (if there is caching)
+                * else bypass the cache.
+                */
+               if (cache || nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
+                       if (dev->param.nShortOpCaches > 0) {
 
-               yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+                               /* If we can't find the data in the cache, then load it up. */
 
-               bi->blockState = state;
-               bi->sequenceNumber = sequenceNumber;
+                               if (!cache) {
+                                       cache = yaffs_GrabChunkCache(in->myDev);
+                                       cache->object = in;
+                                       cache->chunkId = chunk;
+                                       cache->dirty = 0;
+                                       cache->locked = 0;
+                                       yaffs_ReadChunkDataFromObject(in, chunk,
+                                                                     cache->
+                                                                     data);
+                                       cache->nBytes = 0;
+                               }
 
-               if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
-                       bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+                               yaffs_UseChunkCache(dev, cache, 0);
 
-               T(YAFFS_TRACE_SCAN_DEBUG,
-                 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
-                  state, sequenceNumber));
+                               cache->locked = 1;
 
-               if (state == YAFFS_BLOCK_STATE_DEAD) {
-                       T(YAFFS_TRACE_BAD_BLOCKS,
-                         (TSTR("block %d is bad" TENDSTR), blk));
-               } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
-                       T(YAFFS_TRACE_SCAN_DEBUG,
-                         (TSTR("Block empty " TENDSTR)));
-                       dev->nErasedBlocks++;
-                       dev->nFreeChunks += dev->nChunksPerBlock;
-               }
-       }
 
-       startIterator = dev->internalStartBlock;
-       endIterator = dev->internalEndBlock;
+                               memcpy(buffer, &cache->data[start], nToCopy);
 
-       /* For each block.... */
-       for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
-            blockIterator++) {
+                               cache->locked = 0;
+                       } else {
+                               /* Read into the local buffer then copy..*/
 
-               YYIELD();
+                               __u8 *localBuffer =
+                                   yaffs_GetTempBuffer(dev, __LINE__);
+                               yaffs_ReadChunkDataFromObject(in, chunk,
+                                                             localBuffer);
 
-               YYIELD();
+                               memcpy(buffer, &localBuffer[start], nToCopy);
 
-               blk = blockIterator;
 
-               bi = yaffs_GetBlockInfo(dev, blk);
-               state = bi->blockState;
+                               yaffs_ReleaseTempBuffer(dev, localBuffer,
+                                                       __LINE__);
+                       }
 
-               deleted = 0;
+               } else {
 
-               /* For each chunk in each block that needs scanning....*/
-               for (c = 0; !alloc_failed && c < dev->nChunksPerBlock &&
-                    state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
-                       /* Read the tags and decide what to do */
-                       chunk = blk * dev->nChunksPerBlock + c;
+                       /* A full chunk. Read directly into the supplied buffer. */
+                       yaffs_ReadChunkDataFromObject(in, chunk, buffer);
 
-                       result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
-                                                       &tags);
+               }
 
-                       /* Let's have a good look at this chunk... */
+               n -= nToCopy;
+               offset += nToCopy;
+               buffer += nToCopy;
+               nDone += nToCopy;
 
-                       if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
-                               /* YAFFS1 only...
-                                * A deleted chunk
-                                */
-                               deleted++;
-                               dev->nFreeChunks++;
-                               /*T((" %d %d deleted\n",blk,c)); */
-                       } else if (!tags.chunkUsed) {
-                               /* An unassigned chunk in the block
-                                * This means that either the block is empty or
-                                * this is the one being allocated from
-                                */
+       }
 
-                               if (c == 0) {
-                                       /* We're looking at the first chunk in the block so the block is unused */
-                                       state = YAFFS_BLOCK_STATE_EMPTY;
-                                       dev->nErasedBlocks++;
-                               } else {
-                                       /* this is the block being allocated from */
-                                       T(YAFFS_TRACE_SCAN,
-                                         (TSTR
-                                          (" Allocating from %d %d" TENDSTR),
-                                          blk, c));
-                                       state = YAFFS_BLOCK_STATE_ALLOCATING;
-                                       dev->allocationBlock = blk;
-                                       dev->allocationPage = c;
-                                       dev->allocationBlockFinder = blk;
-                                       /* Set it to here to encourage the allocator to go forth from here. */
+       return nDone;
+}
 
-                               }
+int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+                       int nBytes, int writeThrough)
+{
 
-                               dev->nFreeChunks += (dev->nChunksPerBlock - c);
-                       } else if (tags.chunkId > 0) {
-                               /* chunkId > 0 so it is a data chunk... */
-                               unsigned int endpos;
-
-                               yaffs_SetChunkBit(dev, blk, c);
-                               bi->pagesInUse++;
-
-                               in = yaffs_FindOrCreateObjectByNumber(dev,
-                                                                     tags.
-                                                                     objectId,
-                                                                     YAFFS_OBJECT_TYPE_FILE);
-                               /* PutChunkIntoFile checks for a clash (two data chunks with
-                                * the same chunkId).
-                                */
+       int chunk;
+       __u32 start;
+       int nToCopy;
+       int n = nBytes;
+       int nDone = 0;
+       int nToWriteBack;
+       int startOfWrite = offset;
+       int chunkWritten = 0;
+       __u32 nBytesRead;
+       __u32 chunkStart;
 
-                               if (!in)
-                                       alloc_failed = 1;
+       yaffs_Device *dev;
 
-                               if (in) {
-                                       if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
-                                               alloc_failed = 1;
-                               }
+       dev = in->myDev;
 
-                               endpos =
-                                   (tags.chunkId - 1) * dev->nDataBytesPerChunk +
-                                   tags.byteCount;
-                               if (in &&
-                                   in->variantType == YAFFS_OBJECT_TYPE_FILE
-                                   && in->variant.fileVariant.scannedFileSize <
-                                   endpos) {
-                                       in->variant.fileVariant.
-                                           scannedFileSize = endpos;
-                                       if (!dev->useHeaderFileSize) {
-                                               in->variant.fileVariant.
-                                                   fileSize =
-                                                   in->variant.fileVariant.
-                                                   scannedFileSize;
-                                       }
+       while (n > 0 && chunkWritten >= 0) {
+               yaffs_AddrToChunk(dev, offset, &chunk, &start);
 
-                               }
-                               /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
-                       } else {
-                               /* chunkId == 0, so it is an ObjectHeader.
-                                * Thus, we read in the object header and make the object
-                                */
-                               yaffs_SetChunkBit(dev, blk, c);
-                               bi->pagesInUse++;
+               if (chunk * dev->nDataBytesPerChunk + start != offset ||
+                               start >= dev->nDataBytesPerChunk) {
+                       T(YAFFS_TRACE_ERROR, (
+                          TSTR("AddrToChunk of offset %d gives chunk %d start %d"
+                          TENDSTR),
+                          (int)offset, chunk, start));
+               }
+               chunk++; /* File pos to chunk in file offset */
 
-                               result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
-                                                               chunkData,
-                                                               NULL);
-
-                               oh = (yaffs_ObjectHeader *) chunkData;
-
-                               in = yaffs_FindObjectByNumber(dev,
-                                                             tags.objectId);
-                               if (in && in->variantType != oh->type) {
-                                       /* This should not happen, but somehow
-                                        * Wev'e ended up with an objectId that has been reused but not yet
-                                        * deleted, and worse still it has changed type. Delete the old object.
-                                        */
+               /* OK now check for the curveball where the start and end are in
+                * the same chunk.
+                */
 
-                                       yaffs_DeleteObject(in);
+               if ((start + n) < dev->nDataBytesPerChunk) {
+                       nToCopy = n;
 
-                                       in = 0;
-                               }
+                       /* Now folks, to calculate how many bytes to write back....
+                        * If we're overwriting and not writing to then end of file then
+                        * we need to write back as much as was there before.
+                        */
 
-                               in = yaffs_FindOrCreateObjectByNumber(dev,
-                                                                     tags.
-                                                                     objectId,
-                                                                     oh->type);
-
-                               if (!in)
-                                       alloc_failed = 1;
-
-                               if (in && oh->shadowsObject > 0) {
-
-                                       struct yaffs_ShadowFixerStruct *fixer;
-                                       fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
-                                       if (fixer) {
-                                               fixer->next = shadowFixerList;
-                                               shadowFixerList = fixer;
-                                               fixer->objectId = tags.objectId;
-                                               fixer->shadowedId = oh->shadowsObject;
-                                       }
+                       chunkStart = ((chunk - 1) * dev->nDataBytesPerChunk);
 
-                               }
+                       if (chunkStart > in->variant.fileVariant.fileSize)
+                               nBytesRead = 0; /* Past end of file */
+                       else
+                               nBytesRead = in->variant.fileVariant.fileSize - chunkStart;
 
-                               if (in && in->valid) {
-                                       /* We have already filled this one. We have a duplicate and need to resolve it. */
+                       if (nBytesRead > dev->nDataBytesPerChunk)
+                               nBytesRead = dev->nDataBytesPerChunk;
 
-                                       unsigned existingSerial = in->serial;
-                                       unsigned newSerial = tags.serialNumber;
+                       nToWriteBack =
+                           (nBytesRead >
+                            (start + n)) ? nBytesRead : (start + n);
 
-                                       if (((existingSerial + 1) & 3) == newSerial) {
-                                               /* Use new one - destroy the exisiting one */
-                                               yaffs_DeleteChunk(dev,
-                                                                 in->hdrChunk,
-                                                                 1, __LINE__);
-                                               in->valid = 0;
-                                       } else {
-                                               /* Use existing - destroy this one. */
-                                               yaffs_DeleteChunk(dev, chunk, 1,
-                                                                 __LINE__);
-                                       }
-                               }
+                       if (nToWriteBack < 0 || nToWriteBack > dev->nDataBytesPerChunk)
+                               YBUG();
 
-                               if (in && !in->valid &&
-                                   (tags.objectId == YAFFS_OBJECTID_ROOT ||
-                                    tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
-                                       /* We only load some info, don't fiddle with directory structure */
-                                       in->valid = 1;
-                                       in->variantType = oh->type;
+               } else {
+                       nToCopy = dev->nDataBytesPerChunk - start;
+                       nToWriteBack = dev->nDataBytesPerChunk;
+               }
 
-                                       in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-                                       in->win_atime[0] = oh->win_atime[0];
-                                       in->win_ctime[0] = oh->win_ctime[0];
-                                       in->win_mtime[0] = oh->win_mtime[0];
-                                       in->win_atime[1] = oh->win_atime[1];
-                                       in->win_ctime[1] = oh->win_ctime[1];
-                                       in->win_mtime[1] = oh->win_mtime[1];
-#else
-                                       in->yst_uid = oh->yst_uid;
-                                       in->yst_gid = oh->yst_gid;
-                                       in->yst_atime = oh->yst_atime;
-                                       in->yst_mtime = oh->yst_mtime;
-                                       in->yst_ctime = oh->yst_ctime;
-                                       in->yst_rdev = oh->yst_rdev;
-#endif
-                                       in->hdrChunk = chunk;
-                                       in->serial = tags.serialNumber;
+               if (nToCopy != dev->nDataBytesPerChunk || dev->param.inbandTags) {
+                       /* An incomplete start or end chunk (or maybe both start and end chunk),
+                        * or we're using inband tags, so we want to use the cache buffers.
+                        */
+                       if (dev->param.nShortOpCaches > 0) {
+                               yaffs_ChunkCache *cache;
+                               /* If we can't find the data in the cache, then load the cache */
+                               cache = yaffs_FindChunkCache(in, chunk);
 
-                               } else if (in && !in->valid) {
-                                       /* we need to load this info */
+                               if (!cache
+                                   && yaffs_CheckSpaceForAllocation(dev, 1)) {
+                                       cache = yaffs_GrabChunkCache(dev);
+                                       cache->object = in;
+                                       cache->chunkId = chunk;
+                                       cache->dirty = 0;
+                                       cache->locked = 0;
+                                       yaffs_ReadChunkDataFromObject(in, chunk,
+                                                                     cache->data);
+                               } else if (cache &&
+                                       !cache->dirty &&
+                                       !yaffs_CheckSpaceForAllocation(dev, 1)) {
+                                       /* Drop the cache if it was a read cache item and
+                                        * no space check has been made for it.
+                                        */
+                                        cache = NULL;
+                               }
 
-                                       in->valid = 1;
-                                       in->variantType = oh->type;
+                               if (cache) {
+                                       yaffs_UseChunkCache(dev, cache, 1);
+                                       cache->locked = 1;
 
-                                       in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-                                       in->win_atime[0] = oh->win_atime[0];
-                                       in->win_ctime[0] = oh->win_ctime[0];
-                                       in->win_mtime[0] = oh->win_mtime[0];
-                                       in->win_atime[1] = oh->win_atime[1];
-                                       in->win_ctime[1] = oh->win_ctime[1];
-                                       in->win_mtime[1] = oh->win_mtime[1];
-#else
-                                       in->yst_uid = oh->yst_uid;
-                                       in->yst_gid = oh->yst_gid;
-                                       in->yst_atime = oh->yst_atime;
-                                       in->yst_mtime = oh->yst_mtime;
-                                       in->yst_ctime = oh->yst_ctime;
-                                       in->yst_rdev = oh->yst_rdev;
-#endif
-                                       in->hdrChunk = chunk;
-                                       in->serial = tags.serialNumber;
 
-                                       yaffs_SetObjectName(in, oh->name);
-                                       in->dirty = 0;
+                                       memcpy(&cache->data[start], buffer,
+                                              nToCopy);
 
-                                       /* directory stuff...
-                                        * hook up to parent
-                                        */
 
-                                       parent =
-                                           yaffs_FindOrCreateObjectByNumber
-                                           (dev, oh->parentObjectId,
-                                            YAFFS_OBJECT_TYPE_DIRECTORY);
-                                       if (!parent)
-                                               alloc_failed = 1;
-                                       if (parent && parent->variantType ==
-                                           YAFFS_OBJECT_TYPE_UNKNOWN) {
-                                               /* Set up as a directory */
-                                               parent->variantType =
-                                                       YAFFS_OBJECT_TYPE_DIRECTORY;
-                                               YINIT_LIST_HEAD(&parent->variant.
-                                                               directoryVariant.
-                                                               children);
-                                       } else if (!parent || parent->variantType !=
-                                                  YAFFS_OBJECT_TYPE_DIRECTORY) {
-                                               /* Hoosterman, another problem....
-                                                * We're trying to use a non-directory as a directory
-                                                */
+                                       cache->locked = 0;
+                                       cache->nBytes = nToWriteBack;
 
-                                               T(YAFFS_TRACE_ERROR,
-                                                 (TSTR
-                                                  ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
-                                                   TENDSTR)));
-                                               parent = dev->lostNFoundDir;
+                                       if (writeThrough) {
+                                               chunkWritten =
+                                                   yaffs_WriteChunkDataToObject
+                                                   (cache->object,
+                                                    cache->chunkId,
+                                                    cache->data, cache->nBytes,
+                                                    1);
+                                               cache->dirty = 0;
                                        }
 
-                                       yaffs_AddObjectToDirectory(parent, in);
+                               } else {
+                                       chunkWritten = -1;      /* fail the write */
+                               }
+                       } else {
+                               /* An incomplete start or end chunk (or maybe both start and end chunk)
+                                * Read into the local buffer then copy, then copy over and write back.
+                                */
 
-                                       if (0 && (parent == dev->deletedDir ||
-                                                 parent == dev->unlinkedDir)) {
-                                               in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
-                                               dev->nDeletedFiles++;
-                                       }
-                                       /* Note re hardlinks.
-                                        * Since we might scan a hardlink before its equivalent object is scanned
-                                        * we put them all in a list.
-                                        * After scanning is complete, we should have all the objects, so we run through this
-                                        * list and fix up all the chains.
-                                        */
+                               __u8 *localBuffer =
+                                   yaffs_GetTempBuffer(dev, __LINE__);
 
-                                       switch (in->variantType) {
-                                       case YAFFS_OBJECT_TYPE_UNKNOWN:
-                                               /* Todo got a problem */
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_FILE:
-                                               if (dev->useHeaderFileSize)
-
-                                                       in->variant.fileVariant.
-                                                           fileSize =
-                                                           oh->fileSize;
-
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_HARDLINK:
-                                               in->variant.hardLinkVariant.
-                                                       equivalentObjectId =
-                                                       oh->equivalentObjectId;
-                                               in->hardLinks.next =
-                                                       (struct ylist_head *)
-                                                       hardList;
-                                               hardList = in;
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_DIRECTORY:
-                                               /* Do nothing */
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_SPECIAL:
-                                               /* Do nothing */
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_SYMLINK:
-                                               in->variant.symLinkVariant.alias =
-                                                   yaffs_CloneString(oh->alias);
-                                               if (!in->variant.symLinkVariant.alias)
-                                                       alloc_failed = 1;
-                                               break;
-                                       }
+                               yaffs_ReadChunkDataFromObject(in, chunk,
+                                                             localBuffer);
 
-/*
-                                       if (parent == dev->deletedDir) {
-                                               yaffs_DestroyObject(in);
-                                               bi->hasShrinkHeader = 1;
-                                       }
-*/
-                               }
-                       }
-               }
 
-               if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-                       /* If we got this far while scanning, then the block is fully allocated.*/
-                       state = YAFFS_BLOCK_STATE_FULL;
-               }
 
-               bi->blockState = state;
+                               memcpy(&localBuffer[start], buffer, nToCopy);
 
-               /* Now let's see if it was dirty */
-               if (bi->pagesInUse == 0 &&
-                   !bi->hasShrinkHeader &&
-                   bi->blockState == YAFFS_BLOCK_STATE_FULL) {
-                       yaffs_BlockBecameDirty(dev, blk);
-               }
+                               chunkWritten =
+                                   yaffs_WriteChunkDataToObject(in, chunk,
+                                                                localBuffer,
+                                                                nToWriteBack,
+                                                                0);
 
-       }
+                               yaffs_ReleaseTempBuffer(dev, localBuffer,
+                                                       __LINE__);
 
+                       }
 
-       /* Ok, we've done all the scanning.
-        * Fix up the hard link chains.
-        * We should now have scanned all the objects, now it's time to add these
-        * hardlinks.
-        */
+               } else {
+                       /* A full chunk. Write directly from the supplied buffer. */
 
-       yaffs_HardlinkFixup(dev, hardList);
 
-       /* Fix up any shadowed objects */
-       {
-               struct yaffs_ShadowFixerStruct *fixer;
-               yaffs_Object *obj;
-
-               while (shadowFixerList) {
-                       fixer = shadowFixerList;
-                       shadowFixerList = fixer->next;
-                       /* Complete the rename transaction by deleting the shadowed object
-                        * then setting the object header to unshadowed.
-                        */
-                       obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
-                       if (obj)
-                               yaffs_DeleteObject(obj);
 
-                       obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
+                       chunkWritten =
+                           yaffs_WriteChunkDataToObject(in, chunk, buffer,
+                                                        dev->nDataBytesPerChunk,
+                                                        0);
 
-                       if (obj)
-                               yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+                       /* Since we've overwritten the cached data, we better invalidate it. */
+                       yaffs_InvalidateChunkCache(in, chunk);
+               }
 
-                       YFREE(fixer);
+               if (chunkWritten >= 0) {
+                       n -= nToCopy;
+                       offset += nToCopy;
+                       buffer += nToCopy;
+                       nDone += nToCopy;
                }
-       }
 
-       yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+       }
 
-       if (alloc_failed)
-               return YAFFS_FAIL;
+       /* Update file object */
 
-       T(YAFFS_TRACE_SCAN, (TSTR("yaffs_Scan ends" TENDSTR)));
+       if ((startOfWrite + nDone) > in->variant.fileVariant.fileSize)
+               in->variant.fileVariant.fileSize = (startOfWrite + nDone);
 
+       in->dirty = 1;
 
-       return YAFFS_OK;
+       return nDone;
 }
 
-static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
+int yaffs_WriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+                       int nBytes, int writeThrough)
 {
-       __u8 *chunkData;
-       yaffs_ObjectHeader *oh;
-       yaffs_Device *dev;
-       yaffs_ExtendedTags tags;
-       int result;
-       int alloc_failed = 0;
+       yaffs2_HandleHole(in,offset);
+       return yaffs_DoWriteDataToFile(in,buffer,offset,nBytes,writeThrough);
+}
 
-       if (!in)
-               return;
 
-       dev = in->myDev;
 
-#if 0
-       T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
-               in->objectId,
-               in->lazyLoaded ? "not yet" : "already"));
-#endif
+/* ---------------------- File resizing stuff ------------------ */
 
-       if (in->lazyLoaded && in->hdrChunk > 0) {
-               in->lazyLoaded = 0;
-               chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+static void yaffs_PruneResizedChunks(yaffs_Object *in, int newSize)
+{
 
-               result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
-               oh = (yaffs_ObjectHeader *) chunkData;
+       yaffs_Device *dev = in->myDev;
+       int oldFileSize = in->variant.fileVariant.fileSize;
 
-               in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-               in->win_atime[0] = oh->win_atime[0];
-               in->win_ctime[0] = oh->win_ctime[0];
-               in->win_mtime[0] = oh->win_mtime[0];
-               in->win_atime[1] = oh->win_atime[1];
-               in->win_ctime[1] = oh->win_ctime[1];
-               in->win_mtime[1] = oh->win_mtime[1];
-#else
-               in->yst_uid = oh->yst_uid;
-               in->yst_gid = oh->yst_gid;
-               in->yst_atime = oh->yst_atime;
-               in->yst_mtime = oh->yst_mtime;
-               in->yst_ctime = oh->yst_ctime;
-               in->yst_rdev = oh->yst_rdev;
+       int lastDel = 1 + (oldFileSize - 1) / dev->nDataBytesPerChunk;
 
-#endif
-               yaffs_SetObjectName(in, oh->name);
+       int startDel = 1 + (newSize + dev->nDataBytesPerChunk - 1) /
+           dev->nDataBytesPerChunk;
+       int i;
+       int chunkId;
 
-               if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
-                       in->variant.symLinkVariant.alias =
-                                                   yaffs_CloneString(oh->alias);
-                       if (!in->variant.symLinkVariant.alias)
-                               alloc_failed = 1; /* Not returned to caller */
-               }
+       /* Delete backwards so that we don't end up with holes if
+        * power is lost part-way through the operation.
+        */
+       for (i = lastDel; i >= startDel; i--) {
+               /* NB this could be optimised somewhat,
+                * eg. could retrieve the tags and write them without
+                * using yaffs_DeleteChunk
+                */
 
-               yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+               chunkId = yaffs_FindAndDeleteChunkInFile(in, i, NULL);
+               if (chunkId > 0) {
+                       if (chunkId <
+                           (dev->internalStartBlock * dev->param.nChunksPerBlock)
+                           || chunkId >=
+                           ((dev->internalEndBlock +
+                             1) * dev->param.nChunksPerBlock)) {
+                               T(YAFFS_TRACE_ALWAYS,
+                                 (TSTR("Found daft chunkId %d for %d" TENDSTR),
+                                  chunkId, i));
+                       } else {
+                               in->nDataChunks--;
+                               yaffs_DeleteChunk(dev, chunkId, 1, __LINE__);
+                       }
+               }
        }
+
 }
 
-static int yaffs_ScanBackwards(yaffs_Device *dev)
+
+void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize)
 {
-       yaffs_ExtendedTags tags;
-       int blk;
-       int blockIterator;
-       int startIterator;
-       int endIterator;
-       int nBlocksToScan = 0;
+       int newFullChunks;
+       __u32 newSizeOfPartialChunk;
+       yaffs_Device *dev = obj->myDev;
 
-       int chunk;
-       int result;
-       int c;
-       int deleted;
-       yaffs_BlockState state;
-       yaffs_Object *hardList = NULL;
-       yaffs_BlockInfo *bi;
-       __u32 sequenceNumber;
-       yaffs_ObjectHeader *oh;
-       yaffs_Object *in;
-       yaffs_Object *parent;
-       int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
-       int itsUnlinked;
-       __u8 *chunkData;
+       yaffs_AddrToChunk(dev, newSize, &newFullChunks, &newSizeOfPartialChunk);
 
-       int fileSize;
-       int isShrink;
-       int foundChunksInBlock;
-       int equivalentObjectId;
-       int alloc_failed = 0;
+       yaffs_PruneResizedChunks(obj, newSize);
 
+       if (newSizeOfPartialChunk != 0) {
+               int lastChunk = 1 + newFullChunks;
+               __u8 *localBuffer = yaffs_GetTempBuffer(dev, __LINE__);
 
-       yaffs_BlockIndex *blockIndex = NULL;
-       int altBlockIndex = 0;
+               /* Got to read and rewrite the last chunk with its new size and zero pad */
+               yaffs_ReadChunkDataFromObject(obj, lastChunk, localBuffer);
+               memset(localBuffer + newSizeOfPartialChunk, 0,
+                       dev->nDataBytesPerChunk - newSizeOfPartialChunk);
 
-       if (!dev->isYaffs2) {
-               T(YAFFS_TRACE_SCAN,
-                 (TSTR("yaffs_ScanBackwards is only for YAFFS2!" TENDSTR)));
-               return YAFFS_FAIL;
+               yaffs_WriteChunkDataToObject(obj, lastChunk, localBuffer,
+                                            newSizeOfPartialChunk, 1);
+
+               yaffs_ReleaseTempBuffer(dev, localBuffer, __LINE__);
        }
 
-       T(YAFFS_TRACE_SCAN,
-         (TSTR
-          ("yaffs_ScanBackwards starts  intstartblk %d intendblk %d..."
-           TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
+       obj->variant.fileVariant.fileSize = newSize;
+
+       yaffs_PruneFileStructure(dev, &obj->variant.fileVariant);
+}
 
 
-       dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+int yaffs_ResizeFile(yaffs_Object *in, loff_t newSize)
+{
+       yaffs_Device *dev = in->myDev;
+       int oldFileSize = in->variant.fileVariant.fileSize;
 
-       blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+       yaffs_FlushFilesChunkCache(in);
+       yaffs_InvalidateWholeChunkCache(in);
 
-       if (!blockIndex) {
-               blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
-               altBlockIndex = 1;
-       }
+       yaffs_CheckGarbageCollection(dev,0);
 
-       if (!blockIndex) {
-               T(YAFFS_TRACE_SCAN,
-                 (TSTR("yaffs_Scan() could not allocate block index!" TENDSTR)));
+       if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
                return YAFFS_FAIL;
-       }
 
-       dev->blocksInCheckpoint = 0;
+       if (newSize == oldFileSize)
+               return YAFFS_OK;
+               
+       if(newSize > oldFileSize){
+               yaffs2_HandleHole(in,newSize);
+               in->variant.fileVariant.fileSize = newSize;
+       } else {
+               /* newSize < oldFileSize */ 
+               yaffs_ResizeDown(in, newSize);
+       } 
+
+       /* Write a new object header to reflect the resize.
+        * show we've shrunk the file, if need be
+        * Do this only if the file is not in the deleted directories
+        * and is not shadowed.
+        */
+       if (in->parent &&
+           !in->isShadowed &&
+           in->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+           in->parent->objectId != YAFFS_OBJECTID_DELETED)
+               yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL);
+
 
-       chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+       return YAFFS_OK;
+}
 
-       /* Scan all the blocks to determine their state */
-       for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
-               bi = yaffs_GetBlockInfo(dev, blk);
-               yaffs_ClearChunkBits(dev, blk);
-               bi->pagesInUse = 0;
-               bi->softDeletions = 0;
+loff_t yaffs_GetFileSize(yaffs_Object *obj)
+{
+       YCHAR *alias = NULL;
+       obj = yaffs_GetEquivalentObject(obj);
+
+       switch (obj->variantType) {
+       case YAFFS_OBJECT_TYPE_FILE:
+               return obj->variant.fileVariant.fileSize;
+       case YAFFS_OBJECT_TYPE_SYMLINK:
+               alias = obj->variant.symLinkVariant.alias;
+               if(!alias)
+                       return 0;
+               return yaffs_strnlen(alias,YAFFS_MAX_ALIAS_LENGTH);
+       default:
+               return 0;
+       }
+}
 
-               yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
 
-               bi->blockState = state;
-               bi->sequenceNumber = sequenceNumber;
 
-               if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
-                       bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
-               if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
-                       bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+int yaffs_FlushFile(yaffs_Object *in, int updateTime, int dataSync)
+{
+       int retVal;
+       if (in->dirty) {
+               yaffs_FlushFilesChunkCache(in);
+               if(dataSync) /* Only sync data */
+                       retVal=YAFFS_OK;
+               else {
+                       if (updateTime) {
+#ifdef CONFIG_YAFFS_WINCE
+                               yfsd_WinFileTimeNow(in->win_mtime);
+#else
 
-               T(YAFFS_TRACE_SCAN_DEBUG,
-                 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
-                  state, sequenceNumber));
+                               in->yst_mtime = Y_CURRENT_TIME;
 
+#endif
+                       }
 
-               if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
-                       dev->blocksInCheckpoint++;
+                       retVal = (yaffs_UpdateObjectHeader(in, NULL, 0, 0, 0, NULL) >=
+                               0) ? YAFFS_OK : YAFFS_FAIL;
+               }
+       } else {
+               retVal = YAFFS_OK;
+       }
 
-               } else if (state == YAFFS_BLOCK_STATE_DEAD) {
-                       T(YAFFS_TRACE_BAD_BLOCKS,
-                         (TSTR("block %d is bad" TENDSTR), blk));
-               } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
-                       T(YAFFS_TRACE_SCAN_DEBUG,
-                         (TSTR("Block empty " TENDSTR)));
-                       dev->nErasedBlocks++;
-                       dev->nFreeChunks += dev->nChunksPerBlock;
-               } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+       return retVal;
 
-                       /* Determine the highest sequence number */
-                       if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
-                           sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+}
 
-                               blockIndex[nBlocksToScan].seq = sequenceNumber;
-                               blockIndex[nBlocksToScan].block = blk;
+static int yaffs_DoGenericObjectDeletion(yaffs_Object *in)
+{
 
-                               nBlocksToScan++;
+       /* First off, invalidate the file's data in the cache, without flushing. */
+       yaffs_InvalidateWholeChunkCache(in);
 
-                               if (sequenceNumber >= dev->sequenceNumber)
-                                       dev->sequenceNumber = sequenceNumber;
-                       } else {
-                               /* TODO: Nasty sequence number! */
-                               T(YAFFS_TRACE_SCAN,
-                                 (TSTR
-                                  ("Block scanning block %d has bad sequence number %d"
-                                   TENDSTR), blk, sequenceNumber));
+       if (in->myDev->param.isYaffs2 && (in->parent != in->myDev->deletedDir)) {
+               /* Move to the unlinked directory so we have a record that it was deleted. */
+               yaffs_ChangeObjectName(in, in->myDev->deletedDir, _Y("deleted"), 0, 0);
 
-                       }
-               }
        }
 
-       T(YAFFS_TRACE_SCAN,
-       (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
+       yaffs_RemoveObjectFromDirectory(in);
+       yaffs_DeleteChunk(in->myDev, in->hdrChunk, 1, __LINE__);
+       in->hdrChunk = 0;
 
+       yaffs_FreeObject(in);
+       return YAFFS_OK;
 
+}
 
-       YYIELD();
+/* yaffs_DeleteFile deletes the whole file data
+ * and the inode associated with the file.
+ * It does not delete the links associated with the file.
+ */
+static int yaffs_UnlinkFileIfNeeded(yaffs_Object *in)
+{
 
-       /* Sort the blocks */
-#ifndef CONFIG_YAFFS_USE_OWN_SORT
-       {
-               /* Use qsort now. */
-               yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), ybicmp);
-       }
-#else
-       {
-               /* Dungy old bubble sort... */
+       int retVal;
+       int immediateDeletion = 0;
+       yaffs_Device *dev = in->myDev;
 
-               yaffs_BlockIndex temp;
-               int i;
-               int j;
+       if (!in->myInode)
+               immediateDeletion = 1;
 
-               for (i = 0; i < nBlocksToScan; i++)
-                       for (j = i + 1; j < nBlocksToScan; j++)
-                               if (blockIndex[i].seq > blockIndex[j].seq) {
-                                       temp = blockIndex[j];
-                                       blockIndex[j] = blockIndex[i];
-                                       blockIndex[i] = temp;
-                               }
+       if (immediateDeletion) {
+               retVal =
+                   yaffs_ChangeObjectName(in, in->myDev->deletedDir,
+                                          _Y("deleted"), 0, 0);
+               T(YAFFS_TRACE_TRACING,
+                 (TSTR("yaffs: immediate deletion of file %d" TENDSTR),
+                  in->objectId));
+               in->deleted = 1;
+               in->myDev->nDeletedFiles++;
+               if (dev->param.disableSoftDelete || dev->param.isYaffs2)
+                       yaffs_ResizeFile(in, 0);
+               yaffs_SoftDeleteFile(in);
+       } else {
+               retVal =
+                   yaffs_ChangeObjectName(in, in->myDev->unlinkedDir,
+                                          _Y("unlinked"), 0, 0);
        }
-#endif
 
-       YYIELD();
 
-       T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
+       return retVal;
+}
+
+int yaffs_DeleteFile(yaffs_Object *in)
+{
+       int retVal = YAFFS_OK;
+       int deleted; /* Need to cache value on stack if in is freed */
+       yaffs_Device *dev = in->myDev;
+
+       if (dev->param.disableSoftDelete || dev->param.isYaffs2)
+               yaffs_ResizeFile(in, 0);
+
+       if (in->nDataChunks > 0) {
+               /* Use soft deletion if there is data in the file.
+                * That won't be the case if it has been resized to zero.
+                */
+               if (!in->unlinked)
+                       retVal = yaffs_UnlinkFileIfNeeded(in);
 
-       /* Now scan the blocks looking at the data. */
-       startIterator = 0;
-       endIterator = nBlocksToScan - 1;
-       T(YAFFS_TRACE_SCAN_DEBUG,
-         (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+               deleted = in->deleted;
 
-       /* For each block.... backwards */
-       for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
-                       blockIterator--) {
-               /* Cooperative multitasking! This loop can run for so
-                  long that watchdog timers expire. */
-               YYIELD();
+               if (retVal == YAFFS_OK && in->unlinked && !in->deleted) {
+                       in->deleted = 1;
+                       deleted = 1;
+                       in->myDev->nDeletedFiles++;
+                       yaffs_SoftDeleteFile(in);
+               }
+               return deleted ? YAFFS_OK : YAFFS_FAIL;
+       } else {
+               /* The file has no data chunks so we toss it immediately */
+               yaffs_FreeTnode(in->myDev, in->variant.fileVariant.top);
+               in->variant.fileVariant.top = NULL;
+               yaffs_DoGenericObjectDeletion(in);
 
-               /* get the block to scan in the correct order */
-               blk = blockIndex[blockIterator].block;
+               return YAFFS_OK;
+       }
+}
 
-               bi = yaffs_GetBlockInfo(dev, blk);
+static int yaffs_IsNonEmptyDirectory(yaffs_Object *obj)
+{
+       return (obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY) &&
+               !(ylist_empty(&obj->variant.directoryVariant.children));
+}
 
+static int yaffs_DeleteDirectory(yaffs_Object *obj)
+{
+       /* First check that the directory is empty. */
+       if (yaffs_IsNonEmptyDirectory(obj))
+               return YAFFS_FAIL;
 
-               state = bi->blockState;
+       return yaffs_DoGenericObjectDeletion(obj);
+}
 
-               deleted = 0;
+static int yaffs_DeleteSymLink(yaffs_Object *in)
+{
+       if(in->variant.symLinkVariant.alias)
+               YFREE(in->variant.symLinkVariant.alias);
+       in->variant.symLinkVariant.alias=NULL;
 
-               /* For each chunk in each block that needs scanning.... */
-               foundChunksInBlock = 0;
-               for (c = dev->nChunksPerBlock - 1;
-                    !alloc_failed && c >= 0 &&
-                    (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-                     state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
-                       /* Scan backwards...
-                        * Read the tags and decide what to do
-                        */
+       return yaffs_DoGenericObjectDeletion(in);
+}
 
-                       chunk = blk * dev->nChunksPerBlock + c;
+static int yaffs_DeleteHardLink(yaffs_Object *in)
+{
+       /* remove this hardlink from the list assocaited with the equivalent
+        * object
+        */
+       ylist_del_init(&in->hardLinks);
+       return yaffs_DoGenericObjectDeletion(in);
+}
 
-                       result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
-                                                       &tags);
+int yaffs_DeleteObject(yaffs_Object *obj)
+{
+int retVal = -1;
+       switch (obj->variantType) {
+       case YAFFS_OBJECT_TYPE_FILE:
+               retVal = yaffs_DeleteFile(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_DIRECTORY:
+               if(!ylist_empty(&obj->variant.directoryVariant.dirty)){
+                       T(YAFFS_TRACE_BACKGROUND, (TSTR("Remove object %d from dirty directories" TENDSTR),obj->objectId));
+                       ylist_del_init(&obj->variant.directoryVariant.dirty);
+               }
+               return yaffs_DeleteDirectory(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_SYMLINK:
+               retVal = yaffs_DeleteSymLink(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_HARDLINK:
+               retVal = yaffs_DeleteHardLink(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_SPECIAL:
+               retVal = yaffs_DoGenericObjectDeletion(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_UNKNOWN:
+               retVal = 0;
+               break;          /* should not happen. */
+       }
 
-                       /* Let's have a good look at this chunk... */
+       return retVal;
+}
 
-                       if (!tags.chunkUsed) {
-                               /* An unassigned chunk in the block.
-                                * If there are used chunks after this one, then
-                                * it is a chunk that was skipped due to failing the erased
-                                * check. Just skip it so that it can be deleted.
-                                * But, more typically, We get here when this is an unallocated
-                                * chunk and his means that either the block is empty or
-                                * this is the one being allocated from
-                                */
+static int yaffs_UnlinkWorker(yaffs_Object *obj)
+{
 
-                               if (foundChunksInBlock) {
-                                       /* This is a chunk that was skipped due to failing the erased check */
-                               } else if (c == 0) {
-                                       /* We're looking at the first chunk in the block so the block is unused */
-                                       state = YAFFS_BLOCK_STATE_EMPTY;
-                                       dev->nErasedBlocks++;
-                               } else {
-                                       if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
-                                           state == YAFFS_BLOCK_STATE_ALLOCATING) {
-                                               if (dev->sequenceNumber == bi->sequenceNumber) {
-                                                       /* this is the block being allocated from */
-
-                                                       T(YAFFS_TRACE_SCAN,
-                                                         (TSTR
-                                                          (" Allocating from %d %d"
-                                                           TENDSTR), blk, c));
-
-                                                       state = YAFFS_BLOCK_STATE_ALLOCATING;
-                                                       dev->allocationBlock = blk;
-                                                       dev->allocationPage = c;
-                                                       dev->allocationBlockFinder = blk;
-                                               } else {
-                                                       /* This is a partially written block that is not
-                                                        * the current allocation block. This block must have
-                                                        * had a write failure, so set up for retirement.
-                                                        */
-
-                                                        /* bi->needsRetiring = 1; ??? TODO */
-                                                        bi->gcPrioritise = 1;
-
-                                                        T(YAFFS_TRACE_ALWAYS,
-                                                        (TSTR("Partially written block %d detected" TENDSTR),
-                                                        blk));
-                                               }
-                                       }
-                               }
+       int immediateDeletion = 0;
 
-                               dev->nFreeChunks++;
+       if (!obj->myInode)
+               immediateDeletion = 1;
 
-                       } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
-                               T(YAFFS_TRACE_SCAN,
-                                 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
-                                 blk, c));
-
-                                 dev->nFreeChunks++;
-
-                       } else if (tags.chunkId > 0) {
-                               /* chunkId > 0 so it is a data chunk... */
-                               unsigned int endpos;
-                               __u32 chunkBase =
-                                   (tags.chunkId - 1) * dev->nDataBytesPerChunk;
-
-                               foundChunksInBlock = 1;
-
-
-                               yaffs_SetChunkBit(dev, blk, c);
-                               bi->pagesInUse++;
-
-                               in = yaffs_FindOrCreateObjectByNumber(dev,
-                                                                     tags.
-                                                                     objectId,
-                                                                     YAFFS_OBJECT_TYPE_FILE);
-                               if (!in) {
-                                       /* Out of memory */
-                                       alloc_failed = 1;
-                               }
+       if(obj)
+               yaffs_UpdateParent(obj->parent);
 
-                               if (in &&
-                                   in->variantType == YAFFS_OBJECT_TYPE_FILE
-                                   && chunkBase <
-                                   in->variant.fileVariant.shrinkSize) {
-                                       /* This has not been invalidated by a resize */
-                                       if (!yaffs_PutChunkIntoFile(in, tags.chunkId,
-                                                              chunk, -1)) {
-                                               alloc_failed = 1;
-                                       }
+       if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+               return yaffs_DeleteHardLink(obj);
+       } else if (!ylist_empty(&obj->hardLinks)) {
+               /* Curve ball: We're unlinking an object that has a hardlink.
+                *
+                * This problem arises because we are not strictly following
+                * The Linux link/inode model.
+                *
+                * We can't really delete the object.
+                * Instead, we do the following:
+                * - Select a hardlink.
+                * - Unhook it from the hard links
+                * - Move it from its parent directory (so that the rename can work)
+                * - Rename the object to the hardlink's name.
+                * - Delete the hardlink
+                */
 
-                                       /* File size is calculated by looking at the data chunks if we have not
-                                        * seen an object header yet. Stop this practice once we find an object header.
-                                        */
-                                       endpos =
-                                           (tags.chunkId -
-                                            1) * dev->nDataBytesPerChunk +
-                                           tags.byteCount;
-
-                                       if (!in->valid &&       /* have not got an object header yet */
-                                           in->variant.fileVariant.
-                                           scannedFileSize < endpos) {
-                                               in->variant.fileVariant.
-                                                   scannedFileSize = endpos;
-                                               in->variant.fileVariant.
-                                                   fileSize =
-                                                   in->variant.fileVariant.
-                                                   scannedFileSize;
-                                       }
+               yaffs_Object *hl;
+               yaffs_Object *parent;
+               int retVal;
+               YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
 
-                               } else if (in) {
-                                       /* This chunk has been invalidated by a resize, so delete */
-                                       yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+               hl = ylist_entry(obj->hardLinks.next, yaffs_Object, hardLinks);
 
-                               }
-                       } else {
-                               /* chunkId == 0, so it is an ObjectHeader.
-                                * Thus, we read in the object header and make the object
-                                */
-                               foundChunksInBlock = 1;
+               yaffs_GetObjectName(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
+               parent = hl->parent;
 
-                               yaffs_SetChunkBit(dev, blk, c);
-                               bi->pagesInUse++;
+               ylist_del_init(&hl->hardLinks);
 
-                               oh = NULL;
-                               in = NULL;
+               yaffs_AddObjectToDirectory(obj->myDev->unlinkedDir, hl);
 
-                               if (tags.extraHeaderInfoAvailable) {
-                                       in = yaffs_FindOrCreateObjectByNumber
-                                           (dev, tags.objectId,
-                                            tags.extraObjectType);
-                                       if (!in)
-                                               alloc_failed = 1;
-                               }
+               retVal = yaffs_ChangeObjectName(obj,parent, name, 0, 0);
 
-                               if (!in ||
-#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
-                                   !in->valid ||
-#endif
-                                   tags.extraShadows ||
-                                   (!in->valid &&
-                                   (tags.objectId == YAFFS_OBJECTID_ROOT ||
-                                    tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
-
-                                       /* If we don't have  valid info then we need to read the chunk
-                                        * TODO In future we can probably defer reading the chunk and
-                                        * living with invalid data until needed.
-                                        */
+               if (retVal == YAFFS_OK)
+                       retVal = yaffs_DoGenericObjectDeletion(hl);
 
-                                       result = yaffs_ReadChunkWithTagsFromNAND(dev,
-                                                                       chunk,
-                                                                       chunkData,
-                                                                       NULL);
-
-                                       oh = (yaffs_ObjectHeader *) chunkData;
-
-                                       if (dev->inbandTags) {
-                                               /* Fix up the header if they got corrupted by inband tags */
-                                               oh->shadowsObject = oh->inbandShadowsObject;
-                                               oh->isShrink = oh->inbandIsShrink;
-                                       }
+               return retVal;
 
-                                       if (!in) {
-                                               in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
-                                               if (!in)
-                                                       alloc_failed = 1;
-                                       }
+       } else if (immediateDeletion) {
+               switch (obj->variantType) {
+               case YAFFS_OBJECT_TYPE_FILE:
+                       return yaffs_DeleteFile(obj);
+                       break;
+               case YAFFS_OBJECT_TYPE_DIRECTORY:
+                       ylist_del_init(&obj->variant.directoryVariant.dirty);
+                       return yaffs_DeleteDirectory(obj);
+                       break;
+               case YAFFS_OBJECT_TYPE_SYMLINK:
+                       return yaffs_DeleteSymLink(obj);
+                       break;
+               case YAFFS_OBJECT_TYPE_SPECIAL:
+                       return yaffs_DoGenericObjectDeletion(obj);
+                       break;
+               case YAFFS_OBJECT_TYPE_HARDLINK:
+               case YAFFS_OBJECT_TYPE_UNKNOWN:
+               default:
+                       return YAFFS_FAIL;
+               }
+       } else if(yaffs_IsNonEmptyDirectory(obj))
+               return YAFFS_FAIL;
+       else
+               return yaffs_ChangeObjectName(obj, obj->myDev->unlinkedDir,
+                                          _Y("unlinked"), 0, 0);
+}
 
-                               }
 
-                               if (!in) {
-                                       /* TODO Hoosterman we have a problem! */
-                                       T(YAFFS_TRACE_ERROR,
-                                         (TSTR
-                                          ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
-                                           TENDSTR), tags.objectId, chunk));
-                                       continue;
-                               }
+static int yaffs_UnlinkObject(yaffs_Object *obj)
+{
 
-                               if (in->valid) {
-                                       /* We have already filled this one.
-                                        * We have a duplicate that will be discarded, but
-                                        * we first have to suck out resize info if it is a file.
-                                        */
+       if (obj && obj->unlinkAllowed)
+               return yaffs_UnlinkWorker(obj);
 
-                                       if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
-                                            ((oh &&
-                                              oh->type == YAFFS_OBJECT_TYPE_FILE) ||
-                                             (tags.extraHeaderInfoAvailable  &&
-                                              tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
-                                               __u32 thisSize =
-                                                   (oh) ? oh->fileSize : tags.
-                                                   extraFileLength;
-                                               __u32 parentObjectId =
-                                                   (oh) ? oh->
-                                                   parentObjectId : tags.
-                                                   extraParentObjectId;
-
-
-                                               isShrink =
-                                                   (oh) ? oh->isShrink : tags.
-                                                   extraIsShrinkHeader;
+       return YAFFS_FAIL;
 
-                                               /* If it is deleted (unlinked at start also means deleted)
-                                                * we treat the file size as being zeroed at this point.
-                                                */
-                                               if (parentObjectId ==
-                                                   YAFFS_OBJECTID_DELETED
-                                                   || parentObjectId ==
-                                                   YAFFS_OBJECTID_UNLINKED) {
-                                                       thisSize = 0;
-                                                       isShrink = 1;
-                                               }
+}
+int yaffs_Unlink(yaffs_Object *dir, const YCHAR *name)
+{
+       yaffs_Object *obj;
 
-                                               if (isShrink &&
-                                                   in->variant.fileVariant.
-                                                   shrinkSize > thisSize) {
-                                                       in->variant.fileVariant.
-                                                           shrinkSize =
-                                                           thisSize;
-                                               }
+       obj = yaffs_FindObjectByName(dir, name);
+       return yaffs_UnlinkObject(obj);
+}
 
-                                               if (isShrink)
-                                                       bi->hasShrinkHeader = 1;
+/*----------------------- Initialisation Scanning ---------------------- */
 
-                                       }
-                                       /* Use existing - destroy this one. */
-                                       yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
+                               int backwardScanning)
+{
+       yaffs_Object *obj;
 
-                               }
+       if (!backwardScanning) {
+               /* Handle YAFFS1 forward scanning case
+                * For YAFFS1 we always do the deletion
+                */
 
-                               if (!in->valid && in->variantType !=
-                                   (oh ? oh->type : tags.extraObjectType))
-                                       T(YAFFS_TRACE_ERROR, (
-                                               TSTR("yaffs tragedy: Bad object type, "
-                                           TCONT("%d != %d, for object %d at chunk ")
-                                           TCONT("%d during scan")
-                                               TENDSTR), oh ?
-                                           oh->type : tags.extraObjectType,
-                                           in->variantType, tags.objectId,
-                                           chunk));
-
-                               if (!in->valid &&
-                                   (tags.objectId == YAFFS_OBJECTID_ROOT ||
-                                    tags.objectId ==
-                                    YAFFS_OBJECTID_LOSTNFOUND)) {
-                                       /* We only load some info, don't fiddle with directory structure */
-                                       in->valid = 1;
+       } else {
+               /* Handle YAFFS2 case (backward scanning)
+                * If the shadowed object exists then ignore.
+                */
+               obj = yaffs_FindObjectByNumber(dev, objId);
+               if(obj)
+                       return;
+       }
 
-                                       if (oh) {
-                                               in->variantType = oh->type;
+       /* Let's create it (if it does not exist) assuming it is a file so that it can do shrinking etc.
+        * We put it in unlinked dir to be cleaned up after the scanning
+        */
+       obj =
+           yaffs_FindOrCreateObjectByNumber(dev, objId,
+                                            YAFFS_OBJECT_TYPE_FILE);
+       if (!obj)
+               return;
+       obj->isShadowed = 1;
+       yaffs_AddObjectToDirectory(dev->unlinkedDir, obj);
+       obj->variant.fileVariant.shrinkSize = 0;
+       obj->valid = 1;         /* So that we don't read any other info for this file */
 
-                                               in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-                                               in->win_atime[0] = oh->win_atime[0];
-                                               in->win_ctime[0] = oh->win_ctime[0];
-                                               in->win_mtime[0] = oh->win_mtime[0];
-                                               in->win_atime[1] = oh->win_atime[1];
-                                               in->win_ctime[1] = oh->win_ctime[1];
-                                               in->win_mtime[1] = oh->win_mtime[1];
-#else
-                                               in->yst_uid = oh->yst_uid;
-                                               in->yst_gid = oh->yst_gid;
-                                               in->yst_atime = oh->yst_atime;
-                                               in->yst_mtime = oh->yst_mtime;
-                                               in->yst_ctime = oh->yst_ctime;
-                                               in->yst_rdev = oh->yst_rdev;
+}
 
-#endif
-                                       } else {
-                                               in->variantType = tags.extraObjectType;
-                                               in->lazyLoaded = 1;
-                                       }
 
-                                       in->hdrChunk = chunk;
+void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList)
+{
+       yaffs_Object *hl;
+       yaffs_Object *in;
 
-                               } else if (!in->valid) {
-                                       /* we need to load this info */
+       while (hardList) {
+               hl = hardList;
+               hardList = (yaffs_Object *) (hardList->hardLinks.next);
 
-                                       in->valid = 1;
-                                       in->hdrChunk = chunk;
+               in = yaffs_FindObjectByNumber(dev,
+                                             hl->variant.hardLinkVariant.
+                                             equivalentObjectId);
 
-                                       if (oh) {
-                                               in->variantType = oh->type;
+               if (in) {
+                       /* Add the hardlink pointers */
+                       hl->variant.hardLinkVariant.equivalentObject = in;
+                       ylist_add(&hl->hardLinks, &in->hardLinks);
+               } else {
+                       /* Todo Need to report/handle this better.
+                        * Got a problem... hardlink to a non-existant object
+                        */
+                       hl->variant.hardLinkVariant.equivalentObject = NULL;
+                       YINIT_LIST_HEAD(&hl->hardLinks);
 
-                                               in->yst_mode = oh->yst_mode;
-#ifdef CONFIG_YAFFS_WINCE
-                                               in->win_atime[0] = oh->win_atime[0];
-                                               in->win_ctime[0] = oh->win_ctime[0];
-                                               in->win_mtime[0] = oh->win_mtime[0];
-                                               in->win_atime[1] = oh->win_atime[1];
-                                               in->win_ctime[1] = oh->win_ctime[1];
-                                               in->win_mtime[1] = oh->win_mtime[1];
-#else
-                                               in->yst_uid = oh->yst_uid;
-                                               in->yst_gid = oh->yst_gid;
-                                               in->yst_atime = oh->yst_atime;
-                                               in->yst_mtime = oh->yst_mtime;
-                                               in->yst_ctime = oh->yst_ctime;
-                                               in->yst_rdev = oh->yst_rdev;
-#endif
+               }
+       }
+}
 
-                                               if (oh->shadowsObject > 0)
-                                                       yaffs_HandleShadowedObject(dev,
-                                                                          oh->
-                                                                          shadowsObject,
-                                                                          1);
-
-
-                                               yaffs_SetObjectName(in, oh->name);
-                                               parent =
-                                                   yaffs_FindOrCreateObjectByNumber
-                                                       (dev, oh->parentObjectId,
-                                                        YAFFS_OBJECT_TYPE_DIRECTORY);
-
-                                                fileSize = oh->fileSize;
-                                                isShrink = oh->isShrink;
-                                                equivalentObjectId = oh->equivalentObjectId;
 
-                                       } else {
-                                               in->variantType = tags.extraObjectType;
-                                               parent =
-                                                   yaffs_FindOrCreateObjectByNumber
-                                                       (dev, tags.extraParentObjectId,
-                                                        YAFFS_OBJECT_TYPE_DIRECTORY);
-                                                fileSize = tags.extraFileLength;
-                                                isShrink = tags.extraIsShrinkHeader;
-                                                equivalentObjectId = tags.extraEquivalentObjectId;
-                                               in->lazyLoaded = 1;
+static void yaffs_StripDeletedObjects(yaffs_Device *dev)
+{
+       /*
+       *  Sort out state of unlinked and deleted objects after scanning.
+       */
+       struct ylist_head *i;
+       struct ylist_head *n;
+       yaffs_Object *l;
 
-                                       }
-                                       in->dirty = 0;
+       if (dev->readOnly)
+               return;
 
-                                       if (!parent)
-                                               alloc_failed = 1;
+       /* Soft delete all the unlinked files */
+       ylist_for_each_safe(i, n,
+               &dev->unlinkedDir->variant.directoryVariant.children) {
+               if (i) {
+                       l = ylist_entry(i, yaffs_Object, siblings);
+                       yaffs_DeleteObject(l);
+               }
+       }
 
-                                       /* directory stuff...
-                                        * hook up to parent
-                                        */
+       ylist_for_each_safe(i, n,
+               &dev->deletedDir->variant.directoryVariant.children) {
+               if (i) {
+                       l = ylist_entry(i, yaffs_Object, siblings);
+                       yaffs_DeleteObject(l);
+               }
+       }
 
-                                       if (parent && parent->variantType ==
-                                           YAFFS_OBJECT_TYPE_UNKNOWN) {
-                                               /* Set up as a directory */
-                                               parent->variantType =
-                                                       YAFFS_OBJECT_TYPE_DIRECTORY;
-                                               YINIT_LIST_HEAD(&parent->variant.
-                                                       directoryVariant.
-                                                       children);
-                                       } else if (!parent || parent->variantType !=
-                                                  YAFFS_OBJECT_TYPE_DIRECTORY) {
-                                               /* Hoosterman, another problem....
-                                                * We're trying to use a non-directory as a directory
-                                                */
+}
 
-                                               T(YAFFS_TRACE_ERROR,
-                                                 (TSTR
-                                                  ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
-                                                   TENDSTR)));
-                                               parent = dev->lostNFoundDir;
-                                       }
+/*
+ * This code iterates through all the objects making sure that they are rooted.
+ * Any unrooted objects are re-rooted in lost+found.
+ * An object needs to be in one of:
+ * - Directly under deleted, unlinked
+ * - Directly or indirectly under root.
+ *
+ * Note:
+ *  This code assumes that we don't ever change the current relationships between
+ *  directories:
+ *   rootDir->parent == unlinkedDir->parent == deletedDir->parent == NULL
+ *   lostNfound->parent == rootDir
+ *
+ * This fixes the problem where directories might have inadvertently been deleted
+ * leaving the object "hanging" without being rooted in the directory tree.
+ */
+ 
+static int yaffs_HasNULLParent(yaffs_Device *dev, yaffs_Object *obj)
+{
+       return (obj == dev->deletedDir ||
+               obj == dev->unlinkedDir||
+               obj == dev->rootDir);
+}
 
-                                       yaffs_AddObjectToDirectory(parent, in);
+static void yaffs_FixHangingObjects(yaffs_Device *dev)
+{
+       yaffs_Object *obj;
+       yaffs_Object *parent;
+       int i;
+       struct ylist_head *lh;
+       struct ylist_head *n;
+       int depthLimit;
+       int hanging;
 
-                                       itsUnlinked = (parent == dev->deletedDir) ||
-                                                     (parent == dev->unlinkedDir);
+       if (dev->readOnly)
+               return;
 
-                                       if (isShrink) {
-                                               /* Mark the block as having a shrinkHeader */
-                                               bi->hasShrinkHeader = 1;
-                                       }
+       /* Iterate through the objects in each hash entry,
+        * looking at each object.
+        * Make sure it is rooted.
+        */
 
-                                       /* Note re hardlinks.
-                                        * Since we might scan a hardlink before its equivalent object is scanned
-                                        * we put them all in a list.
-                                        * After scanning is complete, we should have all the objects, so we run
-                                        * through this list and fix up all the chains.
+       for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
+               ylist_for_each_safe(lh, n, &dev->objectBucket[i].list) {
+                       if (lh) {
+                               obj = ylist_entry(lh, yaffs_Object, hashLink);
+                               parent= obj->parent;
+                               
+                               if(yaffs_HasNULLParent(dev,obj)){
+                                       /* These directories are not hanging */
+                                       hanging = 0;
+                               }
+                               else if(!parent || parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+                                       hanging = 1;
+                               else if(yaffs_HasNULLParent(dev,parent))
+                                       hanging = 0;
+                               else {
+                                       /*
+                                        * Need to follow the parent chain to see if it is hanging.
                                         */
+                                       hanging = 0;
+                                       depthLimit=100;
 
-                                       switch (in->variantType) {
-                                       case YAFFS_OBJECT_TYPE_UNKNOWN:
-                                               /* Todo got a problem */
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_FILE:
-
-                                               if (in->variant.fileVariant.
-                                                   scannedFileSize < fileSize) {
-                                                       /* This covers the case where the file size is greater
-                                                        * than where the data is
-                                                        * This will happen if the file is resized to be larger
-                                                        * than its current data extents.
-                                                        */
-                                                       in->variant.fileVariant.fileSize = fileSize;
-                                                       in->variant.fileVariant.scannedFileSize =
-                                                           in->variant.fileVariant.fileSize;
-                                               }
-
-                                               if (isShrink &&
-                                                   in->variant.fileVariant.shrinkSize > fileSize) {
-                                                       in->variant.fileVariant.shrinkSize = fileSize;
-                                               }
-
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_HARDLINK:
-                                               if (!itsUnlinked) {
-                                                       in->variant.hardLinkVariant.equivalentObjectId =
-                                                               equivalentObjectId;
-                                                       in->hardLinks.next =
-                                                               (struct ylist_head *) hardList;
-                                                       hardList = in;
-                                               }
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_DIRECTORY:
-                                               /* Do nothing */
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_SPECIAL:
-                                               /* Do nothing */
-                                               break;
-                                       case YAFFS_OBJECT_TYPE_SYMLINK:
-                                               if (oh) {
-                                                       in->variant.symLinkVariant.alias =
-                                                               yaffs_CloneString(oh->alias);
-                                                       if (!in->variant.symLinkVariant.alias)
-                                                               alloc_failed = 1;
-                                               }
-                                               break;
+                                       while(parent != dev->rootDir &&
+                                               parent->parent &&
+                                               parent->parent->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+                                               depthLimit > 0){
+                                               parent = parent->parent;
+                                               depthLimit--;
                                        }
-
+                                       if(parent != dev->rootDir)
+                                               hanging = 1;
+                               }
+                               if(hanging){
+                                       T(YAFFS_TRACE_SCAN,
+                                         (TSTR("Hanging object %d moved to lost and found" TENDSTR),
+                                               obj->objectId));
+                                       yaffs_AddObjectToDirectory(dev->lostNFoundDir,obj);
                                }
-
                        }
+               }
+       }
+}
 
-               } /* End of scanning for each chunk */
 
-               if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
-                       /* If we got this far while scanning, then the block is fully allocated. */
-                       state = YAFFS_BLOCK_STATE_FULL;
-               }
+/*
+ * Delete directory contents for cleaning up lost and found.
+ */
+static void yaffs_DeleteDirectoryContents(yaffs_Object *dir)
+{
+       yaffs_Object *obj;
+       struct ylist_head *lh;
+       struct ylist_head *n;
 
-               bi->blockState = state;
+       if(dir->variantType != YAFFS_OBJECT_TYPE_DIRECTORY)
+               YBUG();
+       
+       ylist_for_each_safe(lh, n, &dir->variant.directoryVariant.children) {
+               if (lh) {
+                       obj = ylist_entry(lh, yaffs_Object, siblings);
+                       if(obj->variantType == YAFFS_OBJECT_TYPE_DIRECTORY)
+                               yaffs_DeleteDirectoryContents(obj);
+
+                       T(YAFFS_TRACE_SCAN,
+                               (TSTR("Deleting lost_found object %d" TENDSTR),
+                               obj->objectId));
 
-               /* Now let's see if it was dirty */
-               if (bi->pagesInUse == 0 &&
-                   !bi->hasShrinkHeader &&
-                   bi->blockState == YAFFS_BLOCK_STATE_FULL) {
-                       yaffs_BlockBecameDirty(dev, blk);
+                       /* Need to use UnlinkObject since Delete would not handle
+                        * hardlinked objects correctly.
+                        */
+                       yaffs_UnlinkObject(obj); 
                }
-
        }
+                       
+}
 
-       if (altBlockIndex)
-               YFREE_ALT(blockIndex);
-       else
-               YFREE(blockIndex);
+static void yaffs_EmptyLostAndFound(yaffs_Device *dev)
+{
+       yaffs_DeleteDirectoryContents(dev->lostNFoundDir);
+}
 
-       /* Ok, we've done all the scanning.
-        * Fix up the hard link chains.
-        * We should now have scanned all the objects, now it's time to add these
-        * hardlinks.
-        */
-       yaffs_HardlinkFixup(dev, hardList);
+static void yaffs_CheckObjectDetailsLoaded(yaffs_Object *in)
+{
+       __u8 *chunkData;
+       yaffs_ObjectHeader *oh;
+       yaffs_Device *dev;
+       yaffs_ExtendedTags tags;
+       int result;
+       int alloc_failed = 0;
 
+       if (!in)
+               return;
 
-       yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+       dev = in->myDev;
 
-       if (alloc_failed)
-               return YAFFS_FAIL;
+#if 0
+       T(YAFFS_TRACE_SCAN, (TSTR("details for object %d %s loaded" TENDSTR),
+               in->objectId,
+               in->lazyLoaded ? "not yet" : "already"));
+#endif
 
-       T(YAFFS_TRACE_SCAN, (TSTR("yaffs_ScanBackwards ends" TENDSTR)));
+       if (in->lazyLoaded && in->hdrChunk > 0) {
+               in->lazyLoaded = 0;
+               chunkData = yaffs_GetTempBuffer(dev, __LINE__);
 
-       return YAFFS_OK;
-}
+               result = yaffs_ReadChunkWithTagsFromNAND(dev, in->hdrChunk, chunkData, &tags);
+               oh = (yaffs_ObjectHeader *) chunkData;
 
-/*------------------------------  Directory Functions ----------------------------- */
+               in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+               in->win_atime[0] = oh->win_atime[0];
+               in->win_ctime[0] = oh->win_ctime[0];
+               in->win_mtime[0] = oh->win_mtime[0];
+               in->win_atime[1] = oh->win_atime[1];
+               in->win_ctime[1] = oh->win_ctime[1];
+               in->win_mtime[1] = oh->win_mtime[1];
+#else
+               in->yst_uid = oh->yst_uid;
+               in->yst_gid = oh->yst_gid;
+               in->yst_atime = oh->yst_atime;
+               in->yst_mtime = oh->yst_mtime;
+               in->yst_ctime = oh->yst_ctime;
+               in->yst_rdev = oh->yst_rdev;
 
-static void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
-{
-       struct ylist_head *lh;
-       yaffs_Object *listObj;
+#endif
+               yaffs_SetObjectNameFromOH(in, oh);
 
-       int count = 0;
+               if (in->variantType == YAFFS_OBJECT_TYPE_SYMLINK) {
+                       in->variant.symLinkVariant.alias =
+                                                   yaffs_CloneString(oh->alias);
+                       if (!in->variant.symLinkVariant.alias)
+                               alloc_failed = 1; /* Not returned to caller */
+               }
 
-       if (!obj) {
-               T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
-               YBUG();
-               return;
+               yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
        }
+}
 
-       if (yaffs_SkipVerification(obj->myDev))
-               return;
+/*------------------------------  Directory Functions ----------------------------- */
 
-       if (!obj->parent) {
-               T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
-               YBUG();
+/*
+ *yaffs_UpdateParent() handles fixing a directories mtime and ctime when a new
+ * link (ie. name) is created or deleted in the directory.
+ *
+ * ie.
+ *   create dir/a : update dir's mtime/ctime
+ *   rm dir/a:   update dir's mtime/ctime
+ *   modify dir/a: don't update dir's mtimme/ctime
+ *
+ * This can be handled immediately or defered. Defering helps reduce the number
+ * of updates when many files in a directory are changed within a brief period.
+ *
+ * If the directory updating is defered then yaffs_UpdateDirtyDirecories must be
+ * called periodically.
+ */
+ 
+static void yaffs_UpdateParent(yaffs_Object *obj)
+{
+       yaffs_Device *dev;
+       if(!obj)
                return;
-       }
-
-       if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-               T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
-               YBUG();
-       }
-
-       /* Iterate through the objects in each hash entry */
+#ifndef CONFIG_YAFFS_WINCE
 
-       ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
-               if (lh) {
-                       listObj = ylist_entry(lh, yaffs_Object, siblings);
-                       yaffs_VerifyObject(listObj);
-                       if (obj == listObj)
-                               count++;
+       dev = obj->myDev;
+       obj->dirty = 1;
+       obj->yst_mtime = obj->yst_ctime = Y_CURRENT_TIME;
+       if(dev->param.deferDirectoryUpdate){
+               struct ylist_head *link = &obj->variant.directoryVariant.dirty; 
+       
+               if(ylist_empty(link)){
+                       ylist_add(link,&dev->dirtyDirectories);
+                       T(YAFFS_TRACE_BACKGROUND, (TSTR("Added object %d to dirty directories" TENDSTR),obj->objectId));
                }
-        }
 
-       if (count != 1) {
-               T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
-               YBUG();
-       }
+       } else
+               yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
+#endif
 }
 
-static void yaffs_VerifyDirectory(yaffs_Object *directory)
+void yaffs_UpdateDirtyDirectories(yaffs_Device *dev)
 {
-       struct ylist_head *lh;
-       yaffs_Object *listObj;
-
-       if (!directory) {
-               YBUG();
-               return;
-       }
+       struct ylist_head *link;
+       yaffs_Object *obj;
+       yaffs_DirectoryStructure *dS;
+       yaffs_ObjectVariant *oV;
 
-       if (yaffs_SkipFullVerification(directory->myDev))
-               return;
+       T(YAFFS_TRACE_BACKGROUND, (TSTR("Update dirty directories" TENDSTR)));
 
-       if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
-               T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
-               YBUG();
-       }
+       while(!ylist_empty(&dev->dirtyDirectories)){
+               link = dev->dirtyDirectories.next;
+               ylist_del_init(link);
+               
+               dS=ylist_entry(link,yaffs_DirectoryStructure,dirty);
+               oV = ylist_entry(dS,yaffs_ObjectVariant,directoryVariant);
+               obj = ylist_entry(oV,yaffs_Object,variant);
 
-       /* Iterate through the objects in each hash entry */
+               T(YAFFS_TRACE_BACKGROUND, (TSTR("Update directory %d" TENDSTR), obj->objectId));
 
-       ylist_for_each(lh, &directory->variant.directoryVariant.children) {
-               if (lh) {
-                       listObj = ylist_entry(lh, yaffs_Object, siblings);
-                       if (listObj->parent != directory) {
-                               T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
-                               YBUG();
-                       }
-                       yaffs_VerifyObjectInDirectory(listObj);
-               }
+               if(obj->dirty)
+                       yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, NULL);
        }
 }
 
-
 static void yaffs_RemoveObjectFromDirectory(yaffs_Object *obj)
 {
        yaffs_Device *dev = obj->myDev;
@@ -6677,18 +4474,17 @@ static void yaffs_RemoveObjectFromDirect
 
        yaffs_VerifyDirectory(parent);
 
-       if (dev && dev->removeObjectCallback)
-               dev->removeObjectCallback(obj);
+       if (dev && dev->param.removeObjectCallback)
+               dev->param.removeObjectCallback(obj);
 
 
        ylist_del_init(&obj->siblings);
        obj->parent = NULL;
-
+       
        yaffs_VerifyDirectory(parent);
 }
 
-
-static void yaffs_AddObjectToDirectory(yaffs_Object *directory,
+void yaffs_AddObjectToDirectory(yaffs_Object *directory,
                                        yaffs_Object *obj)
 {
        if (!directory) {
@@ -6781,7 +4577,7 @@ yaffs_Object *yaffs_FindObjectByName(yaf
                                 * Do a real check
                                 */
                                yaffs_GetObjectName(l, buffer,
-                                                   YAFFS_MAX_NAME_LENGTH);
+                                                   YAFFS_MAX_NAME_LENGTH + 1);
                                if (yaffs_strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH) == 0)
                                        return l;
                        }
@@ -6842,36 +4638,124 @@ yaffs_Object *yaffs_GetEquivalentObject(
        return obj;
 }
 
-int yaffs_GetObjectName(yaffs_Object *obj, YCHAR *name, int buffSize)
-{
-       memset(name, 0, buffSize * sizeof(YCHAR));
-
-       yaffs_CheckObjectDetailsLoaded(obj);
+/*
+ *  A note or two on object names.
+ *  * If the object name is missing, we then make one up in the form objnnn
+ *
+ *  * ASCII names are stored in the object header's name field from byte zero
+ *  * Unicode names are historically stored starting from byte zero.
+ *
+ * Then there are automatic Unicode names...
+ * The purpose of these is to save names in a way that can be read as
+ * ASCII or Unicode names as appropriate, thus allowing a Unicode and ASCII
+ * system to share files.
+ *
+ * These automatic unicode are stored slightly differently...
+ *  - If the name can fit in the ASCII character space then they are saved as 
+ *    ascii names as per above.
+ *  - If the name needs Unicode then the name is saved in Unicode
+ *    starting at oh->name[1].
 
-       if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
-               yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
-       } else if (obj->hdrChunk <= 0) {
+ */
+static void yaffs_FixNullName(yaffs_Object * obj,YCHAR * name, int buffSize)
+{
+       /* Create an object name if we could not find one. */
+       if(yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH) == 0){
                YCHAR locName[20];
                YCHAR numString[20];
                YCHAR *x = &numString[19];
                unsigned v = obj->objectId;
                numString[19] = 0;
-               while (v > 0) {
+               while(v>0){
                        x--;
                        *x = '0' + (v % 10);
                        v /= 10;
                }
                /* make up a name */
                yaffs_strcpy(locName, YAFFS_LOSTNFOUND_PREFIX);
-               yaffs_strcat(locName, x);
+               yaffs_strcat(locName,x);
                yaffs_strncpy(name, locName, buffSize - 1);
+       }
+}
+
+static void yaffs_LoadNameFromObjectHeader(yaffs_Device *dev,YCHAR *name, const YCHAR *ohName, int bufferSize)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+       if(dev->param.autoUnicode){
+               if(*ohName){
+                       /* It is an ASCII name, so do an ASCII to unicode conversion */
+                       const char *asciiOhName = (const char *)ohName;
+                       int n = bufferSize - 1;
+                       while(n > 0 && *asciiOhName){
+                               *name = *asciiOhName;
+                               name++;
+                               asciiOhName++;
+                               n--;
+                       }
+               } else 
+                       yaffs_strncpy(name,ohName+1, bufferSize -1);
+       } else
+#endif
+               yaffs_strncpy(name, ohName, bufferSize - 1);
+}
+
+
+static void yaffs_LoadObjectHeaderFromName(yaffs_Device *dev, YCHAR *ohName, const YCHAR *name)
+{
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+
+       int isAscii;
+       YCHAR *w;
 
+       if(dev->param.autoUnicode){
+
+               isAscii = 1;
+               w = name;
+       
+               /* Figure out if the name will fit in ascii character set */
+               while(isAscii && *w){
+                       if((*w) & 0xff00)
+                               isAscii = 0;
+                       w++;
+               }
+
+               if(isAscii){
+                       /* It is an ASCII name, so do a unicode to ascii conversion */
+                       char *asciiOhName = (char *)ohName;
+                       int n = YAFFS_MAX_NAME_LENGTH  - 1;
+                       while(n > 0 && *name){
+                               *asciiOhName= *name;
+                               name++;
+                               asciiOhName++;
+                               n--;
+                       }
+               } else{
+                       /* It is a unicode name, so save starting at the second YCHAR */
+                       *ohName = 0;
+                       yaffs_strncpy(ohName+1,name, YAFFS_MAX_NAME_LENGTH -2);
+               }
        }
+       else 
+#endif
+               yaffs_strncpy(ohName,name, YAFFS_MAX_NAME_LENGTH - 1);
+
+}
+
+int yaffs_GetObjectName(yaffs_Object * obj, YCHAR * name, int buffSize)
+{
+       memset(name, 0, buffSize * sizeof(YCHAR));
+       
+       yaffs_CheckObjectDetailsLoaded(obj);
+
+       if (obj->objectId == YAFFS_OBJECTID_LOSTNFOUND) {
+               yaffs_strncpy(name, YAFFS_LOSTNFOUND_NAME, buffSize - 1);
+       } 
 #ifdef CONFIG_YAFFS_SHORT_NAMES_IN_RAM
-       else if (obj->shortName[0])
+       else if (obj->shortName[0]) {
                yaffs_strcpy(name, obj->shortName);
+       }
 #endif
-       else {
+       else if(obj->hdrChunk > 0) {
                int result;
                __u8 *buffer = yaffs_GetTempBuffer(obj->myDev, __LINE__);
 
@@ -6884,14 +4768,17 @@ int yaffs_GetObjectName(yaffs_Object *ob
                                                        obj->hdrChunk, buffer,
                                                        NULL);
                }
-               yaffs_strncpy(name, oh->name, buffSize - 1);
+               yaffs_LoadNameFromObjectHeader(obj->myDev,name,oh->name,buffSize);
 
                yaffs_ReleaseTempBuffer(obj->myDev, buffer, __LINE__);
        }
 
-       return yaffs_strlen(name);
+       yaffs_FixNullName(obj,name,buffSize);
+
+       return yaffs_strnlen(name,YAFFS_MAX_NAME_LENGTH);
 }
 
+
 int yaffs_GetObjectFileLength(yaffs_Object *obj)
 {
        /* Dereference any hard linking */
@@ -6899,9 +4786,11 @@ int yaffs_GetObjectFileLength(yaffs_Obje
 
        if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
                return obj->variant.fileVariant.fileSize;
-       if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK)
-               return yaffs_strlen(obj->variant.symLinkVariant.alias);
-       else {
+       if (obj->variantType == YAFFS_OBJECT_TYPE_SYMLINK){
+               if(!obj->variant.symLinkVariant.alias)
+                       return 0;
+               return yaffs_strnlen(obj->variant.symLinkVariant.alias,YAFFS_MAX_ALIAS_LENGTH);
+       } else {
                /* Only a directory should drop through to here */
                return obj->myDev->nDataBytesPerChunk;
        }
@@ -6992,7 +4881,7 @@ int yaffs_SetAttributes(yaffs_Object *ob
        if (valid & ATTR_SIZE)
                yaffs_ResizeFile(obj, attr->ia_size);
 
-       yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0);
+       yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL);
 
        return YAFFS_OK;
 
@@ -7025,12 +4914,129 @@ int yaffs_GetAttributes(yaffs_Object *ob
 
 #endif
 
+
+static int yaffs_DoXMod(yaffs_Object *obj, int set, const YCHAR *name, const void *value, int size, int flags)
+{
+       yaffs_XAttrMod xmod;
+
+       int result;
+
+       xmod.set = set;
+       xmod.name = name;
+       xmod.data = value;
+       xmod.size =  size;
+       xmod.flags = flags;
+       xmod.result = -ENOSPC;
+
+       result = yaffs_UpdateObjectHeader(obj, NULL, 0, 0, 0, &xmod);
+
+       if(result > 0)
+               return xmod.result;
+       else
+               return -ENOSPC;
+}
+
+static int yaffs_ApplyXMod(yaffs_Object *obj, char *buffer, yaffs_XAttrMod *xmod)
+{
+       int retval = 0;
+       int x_offs = sizeof(yaffs_ObjectHeader);
+       yaffs_Device *dev = obj->myDev;
+       int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
+
+       char * x_buffer = buffer + x_offs;
+
+       if(xmod->set)
+               retval = nval_set(x_buffer, x_size, xmod->name, xmod->data, xmod->size, xmod->flags);
+       else
+               retval = nval_del(x_buffer, x_size, xmod->name);
+
+       obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+       obj->xattrKnown = 1;
+
+       xmod->result = retval;
+
+       return retval;
+}
+
+static int yaffs_DoXFetch(yaffs_Object *obj, const YCHAR *name, void *value, int size)
+{
+       char *buffer = NULL;
+       int result;
+       yaffs_ExtendedTags tags;
+       yaffs_Device *dev = obj->myDev;
+       int x_offs = sizeof(yaffs_ObjectHeader);
+       int x_size = dev->nDataBytesPerChunk - sizeof(yaffs_ObjectHeader);
+
+       char * x_buffer;
+
+       int retval = 0;
+
+       if(obj->hdrChunk < 1)
+               return -ENODATA;
+
+       /* If we know that the object has no xattribs then don't do all the
+        * reading and parsing.
+        */
+       if(obj->xattrKnown && !obj->hasXattr){
+               if(name)
+                       return -ENODATA;
+               else
+                       return 0;
+       }
+
+       buffer = (char *) yaffs_GetTempBuffer(dev, __LINE__);
+       if(!buffer)
+               return -ENOMEM;
+
+       result = yaffs_ReadChunkWithTagsFromNAND(dev,obj->hdrChunk, (__u8 *)buffer, &tags);
+
+       if(result != YAFFS_OK)
+               retval = -ENOENT;
+       else{
+               x_buffer =  buffer + x_offs;
+
+               if (!obj->xattrKnown){
+                       obj->hasXattr = nval_hasvalues(x_buffer, x_size);
+                       obj->xattrKnown = 1;
+               }
+
+               if(name)
+                       retval = nval_get(x_buffer, x_size, name, value, size);
+               else
+                       retval = nval_list(x_buffer, x_size, value,size);
+       }
+       yaffs_ReleaseTempBuffer(dev,(__u8 *)buffer,__LINE__);
+       return retval;
+}
+
+int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags)
+{
+       return yaffs_DoXMod(obj, 1, name, value, size, flags);
+}
+
+int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name)
+{
+       return yaffs_DoXMod(obj, 0, name, NULL, 0, 0);
+}
+
+int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size)
+{
+       return yaffs_DoXFetch(obj, name, value, size);
+}
+
+int yaffs_ListXAttributes(yaffs_Object *obj, char *buffer, int size)
+{
+       return yaffs_DoXFetch(obj, NULL, buffer,size);
+}
+
+
+
 #if 0
 int yaffs_DumpObject(yaffs_Object *obj)
 {
        YCHAR name[257];
 
-       yaffs_GetObjectName(obj, name, 256);
+       yaffs_GetObjectName(obj, name, YAFFS_MAX_NAME_LENGTH + 1);
 
        T(YAFFS_TRACE_ALWAYS,
          (TSTR
@@ -7050,30 +5056,32 @@ static int yaffs_CheckDevFunctions(const
 {
 
        /* Common functions, gotta have */
-       if (!dev->eraseBlockInNAND || !dev->initialiseNAND)
+       if (!dev->param.eraseBlockInNAND || !dev->param.initialiseNAND)
                return 0;
 
 #ifdef CONFIG_YAFFS_YAFFS2
 
        /* Can use the "with tags" style interface for yaffs1 or yaffs2 */
-       if (dev->writeChunkWithTagsToNAND &&
-           dev->readChunkWithTagsFromNAND &&
-           !dev->writeChunkToNAND &&
-           !dev->readChunkFromNAND &&
-           dev->markNANDBlockBad && dev->queryNANDBlock)
+       if (dev->param.writeChunkWithTagsToNAND &&
+           dev->param.readChunkWithTagsFromNAND &&
+           !dev->param.writeChunkToNAND &&
+           !dev->param.readChunkFromNAND &&
+           dev->param.markNANDBlockBad &&
+           dev->param.queryNANDBlock)
                return 1;
 #endif
 
        /* Can use the "spare" style interface for yaffs1 */
-       if (!dev->isYaffs2 &&
-           !dev->writeChunkWithTagsToNAND &&
-           !dev->readChunkWithTagsFromNAND &&
-           dev->writeChunkToNAND &&
-           dev->readChunkFromNAND &&
-           !dev->markNANDBlockBad && !dev->queryNANDBlock)
+       if (!dev->param.isYaffs2 &&
+           !dev->param.writeChunkWithTagsToNAND &&
+           !dev->param.readChunkWithTagsFromNAND &&
+           dev->param.writeChunkToNAND &&
+           dev->param.readChunkFromNAND &&
+           !dev->param.markNANDBlockBad &&
+           !dev->param.queryNANDBlock)
                return 1;
 
-       return 0;               /* bad */
+       return 0;       /* bad */
 }
 
 
@@ -7120,35 +5128,35 @@ int yaffs_GutsInitialise(yaffs_Device *d
                return YAFFS_FAIL;
        }
 
-       dev->internalStartBlock = dev->startBlock;
-       dev->internalEndBlock = dev->endBlock;
+       dev->internalStartBlock = dev->param.startBlock;
+       dev->internalEndBlock = dev->param.endBlock;
        dev->blockOffset = 0;
        dev->chunkOffset = 0;
        dev->nFreeChunks = 0;
 
-       dev->gcBlock = -1;
+       dev->gcBlock = 0;
 
-       if (dev->startBlock == 0) {
-               dev->internalStartBlock = dev->startBlock + 1;
-               dev->internalEndBlock = dev->endBlock + 1;
+       if (dev->param.startBlock == 0) {
+               dev->internalStartBlock = dev->param.startBlock + 1;
+               dev->internalEndBlock = dev->param.endBlock + 1;
                dev->blockOffset = 1;
-               dev->chunkOffset = dev->nChunksPerBlock;
+               dev->chunkOffset = dev->param.nChunksPerBlock;
        }
 
        /* Check geometry parameters. */
 
-       if ((!dev->inbandTags && dev->isYaffs2 && dev->totalBytesPerChunk < 1024) ||
-           (!dev->isYaffs2 && dev->totalBytesPerChunk < 512) ||
-           (dev->inbandTags && !dev->isYaffs2) ||
-            dev->nChunksPerBlock < 2 ||
-            dev->nReservedBlocks < 2 ||
+       if ((!dev->param.inbandTags && dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 1024) ||
+           (!dev->param.isYaffs2 && dev->param.totalBytesPerChunk < 512) ||
+           (dev->param.inbandTags && !dev->param.isYaffs2) ||
+            dev->param.nChunksPerBlock < 2 ||
+            dev->param.nReservedBlocks < 2 ||
             dev->internalStartBlock <= 0 ||
             dev->internalEndBlock <= 0 ||
-            dev->internalEndBlock <= (dev->internalStartBlock + dev->nReservedBlocks + 2)) {   /* otherwise it is too small */
+            dev->internalEndBlock <= (dev->internalStartBlock + dev->param.nReservedBlocks + 2)) {     /* otherwise it is too small */
                T(YAFFS_TRACE_ALWAYS,
                  (TSTR
                   ("yaffs: NAND geometry problems: chunk size %d, type is yaffs%s, inbandTags %d "
-                   TENDSTR), dev->totalBytesPerChunk, dev->isYaffs2 ? "2" : "", dev->inbandTags));
+                   TENDSTR), dev->param.totalBytesPerChunk, dev->param.isYaffs2 ? "2" : "", dev->param.inbandTags));
                return YAFFS_FAIL;
        }
 
@@ -7159,10 +5167,10 @@ int yaffs_GutsInitialise(yaffs_Device *d
        }
 
        /* Sort out space for inband tags, if required */
-       if (dev->inbandTags)
-               dev->nDataBytesPerChunk = dev->totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
+       if (dev->param.inbandTags)
+               dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk - sizeof(yaffs_PackedTags2TagsPart);
        else
-               dev->nDataBytesPerChunk = dev->totalBytesPerChunk;
+               dev->nDataBytesPerChunk = dev->param.totalBytesPerChunk;
 
        /* Got the right mix of functions? */
        if (!yaffs_CheckDevFunctions(dev)) {
@@ -7209,12 +5217,12 @@ int yaffs_GutsInitialise(yaffs_Device *d
         * We need to find the next power of 2 > than internalEndBlock
         */
 
-       x = dev->nChunksPerBlock * (dev->internalEndBlock + 1);
+       x = dev->param.nChunksPerBlock * (dev->internalEndBlock + 1);
 
        bits = ShiftsGE(x);
 
        /* Set up tnode width if wide tnodes are enabled. */
-       if (!dev->wideTnodesDisabled) {
+       if (!dev->param.wideTnodesDisabled) {
                /* bits must be even so that we end up with 32-bit words */
                if (bits & 1)
                        bits++;
@@ -7238,10 +5246,13 @@ int yaffs_GutsInitialise(yaffs_Device *d
        else
                dev->chunkGroupBits = bits - dev->tnodeWidth;
 
+       dev->tnodeSize = (dev->tnodeWidth * YAFFS_NTNODES_LEVEL0)/8;
+       if(dev->tnodeSize < sizeof(yaffs_Tnode))
+               dev->tnodeSize = sizeof(yaffs_Tnode);
 
        dev->chunkGroupSize = 1 << dev->chunkGroupBits;
 
-       if (dev->nChunksPerBlock < dev->chunkGroupSize) {
+       if (dev->param.nChunksPerBlock < dev->chunkGroupSize) {
                /* We have a problem because the soft delete won't work if
                 * the chunk group size > chunks per block.
                 * This can be remedied by using larger "virtual blocks".
@@ -7255,9 +5266,11 @@ int yaffs_GutsInitialise(yaffs_Device *d
        /* OK, we've finished verifying the device, lets continue with initialisation */
 
        /* More device initialisation */
-       dev->garbageCollections = 0;
-       dev->passiveGarbageCollections = 0;
-       dev->currentDirtyChecker = 0;
+       dev->allGCs = 0;
+       dev->passiveGCs = 0;
+       dev->oldestDirtyGCs = 0;
+       dev->backgroundGCs = 0;
+       dev->gcBlockFinder = 0;
        dev->bufferedBlock = -1;
        dev->doingBufferedBlockRewrite = 0;
        dev->nDeletedFiles = 0;
@@ -7269,8 +5282,11 @@ int yaffs_GutsInitialise(yaffs_Device *d
        dev->tagsEccUnfixed = 0;
        dev->nErasureFailures = 0;
        dev->nErasedBlocks = 0;
-       dev->isDoingGC = 0;
+       dev->gcDisable= 0;
        dev->hasPendingPrioritisedGCs = 1; /* Assume the worst for now, will get fixed on first GC */
+       YINIT_LIST_HEAD(&dev->dirtyDirectories);
+       dev->oldestDirtySequence = 0;
+       dev->oldestDirtyBlock = 0;
 
        /* Initialise temporary buffers and caches. */
        if (!yaffs_InitialiseTempBuffers(dev))
@@ -7281,13 +5297,13 @@ int yaffs_GutsInitialise(yaffs_Device *d
 
 
        if (!init_failed &&
-           dev->nShortOpCaches > 0) {
+           dev->param.nShortOpCaches > 0) {
                int i;
                void *buf;
-               int srCacheBytes = dev->nShortOpCaches * sizeof(yaffs_ChunkCache);
+               int srCacheBytes = dev->param.nShortOpCaches * sizeof(yaffs_ChunkCache);
 
-               if (dev->nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
-                       dev->nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
+               if (dev->param.nShortOpCaches > YAFFS_MAX_SHORT_OP_CACHES)
+                       dev->param.nShortOpCaches = YAFFS_MAX_SHORT_OP_CACHES;
 
                dev->srCache =  YMALLOC(srCacheBytes);
 
@@ -7296,11 +5312,11 @@ int yaffs_GutsInitialise(yaffs_Device *d
                if (dev->srCache)
                        memset(dev->srCache, 0, srCacheBytes);
 
-               for (i = 0; i < dev->nShortOpCaches && buf; i++) {
+               for (i = 0; i < dev->param.nShortOpCaches && buf; i++) {
                        dev->srCache[i].object = NULL;
                        dev->srCache[i].lastUse = 0;
                        dev->srCache[i].dirty = 0;
-                       dev->srCache[i].data = buf = YMALLOC_DMA(dev->totalBytesPerChunk);
+                       dev->srCache[i].data = buf = YMALLOC_DMA(dev->param.totalBytesPerChunk);
                }
                if (!buf)
                        init_failed = 1;
@@ -7311,19 +5327,18 @@ int yaffs_GutsInitialise(yaffs_Device *d
        dev->cacheHits = 0;
 
        if (!init_failed) {
-               dev->gcCleanupList = YMALLOC(dev->nChunksPerBlock * sizeof(__u32));
+               dev->gcCleanupList = YMALLOC(dev->param.nChunksPerBlock * sizeof(__u32));
                if (!dev->gcCleanupList)
                        init_failed = 1;
        }
 
-       if (dev->isYaffs2)
-               dev->useHeaderFileSize = 1;
+       if (dev->param.isYaffs2)
+               dev->param.useHeaderFileSize = 1;
 
        if (!init_failed && !yaffs_InitialiseBlocks(dev))
                init_failed = 1;
 
-       yaffs_InitialiseTnodes(dev);
-       yaffs_InitialiseObjects(dev);
+       yaffs_InitialiseTnodesAndObjects(dev);
 
        if (!init_failed && !yaffs_CreateInitialDirectories(dev))
                init_failed = 1;
@@ -7331,8 +5346,8 @@ int yaffs_GutsInitialise(yaffs_Device *d
 
        if (!init_failed) {
                /* Now scan the flash. */
-               if (dev->isYaffs2) {
-                       if (yaffs_CheckpointRestore(dev)) {
+               if (dev->param.isYaffs2) {
+                       if (yaffs2_CheckpointRestore(dev)) {
                                yaffs_CheckObjectDetailsLoaded(dev->rootDir);
                                T(YAFFS_TRACE_ALWAYS,
                                  (TSTR("yaffs: restored from checkpoint" TENDSTR)));
@@ -7342,9 +5357,8 @@ int yaffs_GutsInitialise(yaffs_Device *d
                                 * and scan backwards.
                                 */
                                yaffs_DeinitialiseBlocks(dev);
-                               yaffs_DeinitialiseTnodes(dev);
-                               yaffs_DeinitialiseObjects(dev);
 
+                               yaffs_DeinitialiseTnodesAndObjects(dev);
 
                                dev->nErasedBlocks = 0;
                                dev->nFreeChunks = 0;
@@ -7353,24 +5367,25 @@ int yaffs_GutsInitialise(yaffs_Device *d
                                dev->nDeletedFiles = 0;
                                dev->nUnlinkedFiles = 0;
                                dev->nBackgroundDeletions = 0;
-                               dev->oldestDirtySequence = 0;
 
                                if (!init_failed && !yaffs_InitialiseBlocks(dev))
                                        init_failed = 1;
 
-                               yaffs_InitialiseTnodes(dev);
-                               yaffs_InitialiseObjects(dev);
+                               yaffs_InitialiseTnodesAndObjects(dev);
 
                                if (!init_failed && !yaffs_CreateInitialDirectories(dev))
                                        init_failed = 1;
 
-                               if (!init_failed && !yaffs_ScanBackwards(dev))
+                               if (!init_failed && !yaffs2_ScanBackwards(dev))
                                        init_failed = 1;
                        }
-               } else if (!yaffs_Scan(dev))
+               } else if (!yaffs1_Scan(dev))
                                init_failed = 1;
 
                yaffs_StripDeletedObjects(dev);
+               yaffs_FixHangingObjects(dev);
+               if(dev->param.emptyLostAndFound)
+                       yaffs_EmptyLostAndFound(dev);
        }
 
        if (init_failed) {
@@ -7394,6 +5409,9 @@ int yaffs_GutsInitialise(yaffs_Device *d
        yaffs_VerifyFreeChunks(dev);
        yaffs_VerifyBlocks(dev);
 
+       /* Clean up any aborted checkpoint data */
+       if(!dev->isCheckpointed && dev->blocksInCheckpoint > 0)
+               yaffs2_InvalidateCheckpoint(dev);
 
        T(YAFFS_TRACE_TRACING,
          (TSTR("yaffs: yaffs_GutsInitialise() done.\n" TENDSTR)));
@@ -7407,12 +5425,11 @@ void yaffs_Deinitialise(yaffs_Device *de
                int i;
 
                yaffs_DeinitialiseBlocks(dev);
-               yaffs_DeinitialiseTnodes(dev);
-               yaffs_DeinitialiseObjects(dev);
-               if (dev->nShortOpCaches > 0 &&
+               yaffs_DeinitialiseTnodesAndObjects(dev);
+               if (dev->param.nShortOpCaches > 0 &&
                    dev->srCache) {
 
-                       for (i = 0; i < dev->nShortOpCaches; i++) {
+                       for (i = 0; i < dev->param.nShortOpCaches; i++) {
                                if (dev->srCache[i].data)
                                        YFREE(dev->srCache[i].data);
                                dev->srCache[i].data = NULL;
@@ -7429,34 +5446,33 @@ void yaffs_Deinitialise(yaffs_Device *de
 
                dev->isMounted = 0;
 
-               if (dev->deinitialiseNAND)
-                       dev->deinitialiseNAND(dev);
+               if (dev->param.deinitialiseNAND)
+                       dev->param.deinitialiseNAND(dev);
        }
 }
 
-static int yaffs_CountFreeChunks(yaffs_Device *dev)
+int yaffs_CountFreeChunks(yaffs_Device *dev)
 {
-       int nFree;
+       int nFree=0;
        int b;
 
        yaffs_BlockInfo *blk;
 
-       for (nFree = 0, b = dev->internalStartBlock; b <= dev->internalEndBlock;
-                       b++) {
-               blk = yaffs_GetBlockInfo(dev, b);
-
+       blk = dev->blockInfo;
+       for (b = dev->internalStartBlock; b <= dev->internalEndBlock; b++) {
                switch (blk->blockState) {
                case YAFFS_BLOCK_STATE_EMPTY:
                case YAFFS_BLOCK_STATE_ALLOCATING:
                case YAFFS_BLOCK_STATE_COLLECTING:
                case YAFFS_BLOCK_STATE_FULL:
                        nFree +=
-                           (dev->nChunksPerBlock - blk->pagesInUse +
+                           (dev->param.nChunksPerBlock - blk->pagesInUse +
                             blk->softDeletions);
                        break;
                default:
                        break;
                }
+               blk++;
        }
 
        return nFree;
@@ -7481,21 +5497,19 @@ int yaffs_GetNumberOfFreeChunks(yaffs_De
 
        /* Now count the number of dirty chunks in the cache and subtract those */
 
-       for (nDirtyCacheChunks = 0, i = 0; i < dev->nShortOpCaches; i++) {
+       for (nDirtyCacheChunks = 0, i = 0; i < dev->param.nShortOpCaches; i++) {
                if (dev->srCache[i].dirty)
                        nDirtyCacheChunks++;
        }
 
        nFree -= nDirtyCacheChunks;
 
-       nFree -= ((dev->nReservedBlocks + 1) * dev->nChunksPerBlock);
+       nFree -= ((dev->param.nReservedBlocks + 1) * dev->param.nChunksPerBlock);
 
        /* Now we figure out how much to reserve for the checkpoint and report that... */
-       blocksForCheckpoint = yaffs_CalcCheckpointBlocksRequired(dev) - dev->blocksInCheckpoint;
-       if (blocksForCheckpoint < 0)
-               blocksForCheckpoint = 0;
+       blocksForCheckpoint = yaffs2_CalcCheckpointBlocksRequired(dev);
 
-       nFree -= (blocksForCheckpoint * dev->nChunksPerBlock);
+       nFree -= (blocksForCheckpoint * dev->param.nChunksPerBlock);
 
        if (nFree < 0)
                nFree = 0;
@@ -7504,27 +5518,6 @@ int yaffs_GetNumberOfFreeChunks(yaffs_De
 
 }
 
-static int yaffs_freeVerificationFailures;
-
-static void yaffs_VerifyFreeChunks(yaffs_Device *dev)
-{
-       int counted;
-       int difference;
-
-       if (yaffs_SkipVerification(dev))
-               return;
-
-       counted = yaffs_CountFreeChunks(dev);
-
-       difference = dev->nFreeChunks - counted;
-
-       if (difference) {
-               T(YAFFS_TRACE_ALWAYS,
-                 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
-                  dev->nFreeChunks, counted, difference));
-               yaffs_freeVerificationFailures++;
-       }
-}
 
 /*---------------------------------------- YAFFS test code ----------------------*/
 
@@ -7532,7 +5525,7 @@ static void yaffs_VerifyFreeChunks(yaffs
        do { \
                if (sizeof(structure) != syze) { \
                        T(YAFFS_TRACE_ALWAYS, (TSTR("%s should be %d but is %d\n" TENDSTR),\
-                               name, syze, sizeof(structure))); \
+                               name, syze, (int) sizeof(structure))); \
                        return YAFFS_FAIL; \
                } \
        } while (0)
@@ -7542,9 +5535,8 @@ static int yaffs_CheckStructures(void)
 /*      yaffs_CheckStruct(yaffs_Tags,8,"yaffs_Tags"); */
 /*      yaffs_CheckStruct(yaffs_TagsUnion,8,"yaffs_TagsUnion"); */
 /*      yaffs_CheckStruct(yaffs_Spare,16,"yaffs_Spare"); */
-#ifndef CONFIG_YAFFS_TNODE_LIST_DEBUG
-       yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode");
-#endif
+/*     yaffs_CheckStruct(yaffs_Tnode, 2 * YAFFS_NTNODES_LEVEL0, "yaffs_Tnode"); */
+
 #ifndef CONFIG_YAFFS_WINCE
        yaffs_CheckStruct(yaffs_ObjectHeader, 512, "yaffs_ObjectHeader");
 #endif
--- a/fs/yaffs2/yaffs_guts.h
+++ b/fs/yaffs2/yaffs_guts.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -16,8 +16,9 @@
 #ifndef __YAFFS_GUTS_H__
 #define __YAFFS_GUTS_H__
 
-#include "devextras.h"
 #include "yportenv.h"
+#include "devextras.h"
+#include "yaffs_list.h"
 
 #define YAFFS_OK       1
 #define YAFFS_FAIL  0
@@ -52,7 +53,6 @@
 
 #define YAFFS_MAX_CHUNK_ID             0x000FFFFF
 
-#define YAFFS_UNUSED_OBJECT_ID         0x0003FFFF
 
 #define YAFFS_ALLOCATION_NOBJECTS      100
 #define YAFFS_ALLOCATION_NTNODES       100
@@ -62,8 +62,9 @@
 
 
 #define YAFFS_OBJECT_SPACE             0x40000
+#define YAFFS_MAX_OBJECT_ID            (YAFFS_OBJECT_SPACE -1)
 
-#define YAFFS_CHECKPOINT_VERSION       3
+#define YAFFS_CHECKPOINT_VERSION       4
 
 #ifdef CONFIG_YAFFS_UNICODE
 #define YAFFS_MAX_NAME_LENGTH          127
@@ -81,12 +82,11 @@
 #define YAFFS_OBJECTID_UNLINKED                3
 #define YAFFS_OBJECTID_DELETED         4
 
-/* Sseudo object ids for checkpointing */
+/* Pseudo object ids for checkpointing */
 #define YAFFS_OBJECTID_SB_HEADER       0x10
 #define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
 #define YAFFS_SEQUENCE_CHECKPOINT_DATA  0x21
 
-/* */
 
 #define YAFFS_MAX_SHORT_OP_CACHES      20
 
@@ -119,11 +119,7 @@ typedef struct {
        int dirty;
        int nBytes;             /* Only valid if the cache is dirty */
        int locked;             /* Can't push out or flush while locked. */
-#ifdef CONFIG_YAFFS_YAFFS2
        __u8 *data;
-#else
-       __u8 data[YAFFS_BYTES_PER_CHUNK];
-#endif
 } yaffs_ChunkCache;
 
 
@@ -234,6 +230,8 @@ typedef enum {
        YAFFS_BLOCK_STATE_UNKNOWN = 0,
 
        YAFFS_BLOCK_STATE_SCANNING,
+        /* Being scanned */
+
        YAFFS_BLOCK_STATE_NEEDS_SCANNING,
        /* The block might have something on it (ie it is allocating or full, perhaps empty)
         * but it needs to be scanned to determine its true state.
@@ -249,21 +247,23 @@ typedef enum {
        /* This block is partially allocated.
         * At least one page holds valid data.
         * This is the one currently being used for page
-        * allocation. Should never be more than one of these
+        * allocation. Should never be more than one of these.
+         * If a block is only partially allocated at mount it is treated as full.
         */
 
        YAFFS_BLOCK_STATE_FULL,
        /* All the pages in this block have been allocated.
+         * If a block was only partially allocated when mounted we treat
+         * it as fully allocated.
         */
 
        YAFFS_BLOCK_STATE_DIRTY,
-       /* All pages have been allocated and deleted.
+       /* The block was full and now all chunks have been deleted.
         * Erase me, reuse me.
         */
 
        YAFFS_BLOCK_STATE_CHECKPOINT,
-       /* This block is assigned to holding checkpoint data.
-        */
+       /* This block is assigned to holding checkpoint data. */
 
        YAFFS_BLOCK_STATE_COLLECTING,
        /* This block is being garbage collected */
@@ -351,23 +351,12 @@ typedef struct {
 /*--------------------------- Tnode -------------------------- */
 
 union yaffs_Tnode_union {
-#ifdef CONFIG_YAFFS_TNODE_LIST_DEBUG
-       union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL + 1];
-#else
        union yaffs_Tnode_union *internal[YAFFS_NTNODES_INTERNAL];
-#endif
-/*     __u16 level0[YAFFS_NTNODES_LEVEL0]; */
 
 };
 
 typedef union yaffs_Tnode_union yaffs_Tnode;
 
-struct yaffs_TnodeList_struct {
-       struct yaffs_TnodeList_struct *next;
-       yaffs_Tnode *tnodes;
-};
-
-typedef struct yaffs_TnodeList_struct yaffs_TnodeList;
 
 /*------------------------  Object -----------------------------*/
 /* An object can be one of:
@@ -387,6 +376,7 @@ typedef struct {
 
 typedef struct {
        struct ylist_head children;     /* list of child links */
+       struct ylist_head dirty;        /* Entry for list of dirty directories */
 } yaffs_DirectoryStructure;
 
 typedef struct {
@@ -405,6 +395,8 @@ typedef union {
        yaffs_HardLinkStructure hardLinkVariant;
 } yaffs_ObjectVariant;
 
+
+
 struct yaffs_ObjectStruct {
        __u8 deleted:1;         /* This should only apply to unlinked files. */
        __u8 softDeleted:1;     /* it has also been soft deleted */
@@ -424,6 +416,10 @@ struct yaffs_ObjectStruct {
                                 * until the inode is released.
                                 */
        __u8 beingCreated:1;    /* This object is still being created so skip some checks. */
+       __u8 isShadowed:1;      /* This object is shadowed on the way to being renamed. */
+
+       __u8 xattrKnown:1;      /* We know if this has object has xattribs or not. */
+       __u8 hasXattr:1;        /* This object has xattribs. Valid if xattrKnown. */
 
        __u8 serial;            /* serial number of chunk in NAND. Cached here */
        __u16 sum;              /* sum of the name to speed searching */
@@ -452,10 +448,6 @@ struct yaffs_ObjectStruct {
        YCHAR shortName[YAFFS_SHORT_NAME_LENGTH + 1];
 #endif
 
-#ifndef __KERNEL__
-       __u32 inUse;
-#endif
-
 #ifdef CONFIG_YAFFS_WINCE
        __u32 win_ctime[2];
        __u32 win_mtime[2];
@@ -470,10 +462,7 @@ struct yaffs_ObjectStruct {
 
        __u32 yst_rdev;
 
-#ifdef __KERNEL__
-       struct inode *myInode;
-
-#endif
+       void *myInode;
 
        yaffs_ObjectType variantType;
 
@@ -483,13 +472,6 @@ struct yaffs_ObjectStruct {
 
 typedef struct yaffs_ObjectStruct yaffs_Object;
 
-struct yaffs_ObjectList_struct {
-       yaffs_Object *objects;
-       struct yaffs_ObjectList_struct *next;
-};
-
-typedef struct yaffs_ObjectList_struct yaffs_ObjectList;
-
 typedef struct {
        struct ylist_head list;
        int count;
@@ -531,12 +513,18 @@ typedef struct {
 
 /*----------------- Device ---------------------------------*/
 
-struct yaffs_DeviceStruct {
-       struct ylist_head devList;
-       const char *name;
 
-       /* Entry parameters set up way early. Yaffs sets up the rest.*/
-       int nDataBytesPerChunk; /* Should be a power of 2 >= 512 */
+struct yaffs_DeviceParamStruct {
+       const YCHAR *name;
+
+       /*
+         * Entry parameters set up way early. Yaffs sets up the rest.
+         * The structure should be zeroed out before use so that unused
+         * and defualt values are zero.
+         */
+
+       int inbandTags;          /* Use unband tags */
+       __u32 totalBytesPerChunk; /* Should be >= 512, does not need to be a power of 2 */
        int nChunksPerBlock;    /* does not need to be a power of 2 */
        int spareBytesPerChunk; /* spare area size */
        int startBlock;         /* Start block we're allowed to use */
@@ -545,24 +533,24 @@ struct yaffs_DeviceStruct {
                                /* reserved blocks on NOR and RAM. */
 
 
-       /* Stuff used by the shared space checkpointing mechanism */
-       /* If this value is zero, then this mechanism is disabled */
-
-/*     int nCheckpointReservedBlocks; */ /* Blocks to reserve for checkpoint data */
-
-
        int nShortOpCaches;     /* If <= 0, then short op caching is disabled, else
-                                * the number of short op caches (don't use too many)
+                                * the number of short op caches (don't use too many).
+                                 * 10 to 20 is a good bet.
                                 */
+       int useNANDECC;         /* Flag to decide whether or not to use NANDECC on data (yaffs1) */
+       int noTagsECC;          /* Flag to decide whether or not to do ECC on packed tags (yaffs2) */ 
 
-       int useHeaderFileSize;  /* Flag to determine if we should use file sizes from the header */
+       int isYaffs2;           /* Use yaffs2 mode on this device */
 
-       int useNANDECC;         /* Flag to decide whether or not to use NANDECC */
+       int emptyLostAndFound;  /* Auto-empty lost+found directory on mount */
 
-       void *genericDevice;    /* Pointer to device context
-                                * On an mtd this holds the mtd pointer.
-                                */
-       void *superBlock;
+       int refreshPeriod;      /* How often we should check to do a block refresh */
+
+       /* Checkpoint control. Can be set before or after initialisation */
+       __u8 skipCheckpointRead;
+       __u8 skipCheckpointWrite;
+
+       int enableXattr;        /* Enable xattribs */
 
        /* NAND access functions (Must be set before calling YAFFS)*/
 
@@ -589,58 +577,68 @@ struct yaffs_DeviceStruct {
                               yaffs_BlockState *state, __u32 *sequenceNumber);
 #endif
 
-       int isYaffs2;
-
        /* The removeObjectCallback function must be supplied by OS flavours that
-        * need it. The Linux kernel does not use this, but yaffs direct does use
-        * it to implement the faster readdir
+        * need it.
+         * yaffs direct uses it to implement the faster readdir.
+         * Linux uses it to protect the directory during unlocking.
         */
        void (*removeObjectCallback)(struct yaffs_ObjectStruct *obj);
 
-       /* Callback to mark the superblock dirsty */
-       void (*markSuperBlockDirty)(void *superblock);
+       /* Callback to mark the superblock dirty */
+       void (*markSuperBlockDirty)(struct yaffs_DeviceStruct *dev);
+       
+       /*  Callback to control garbage collection. */
+       unsigned (*gcControl)(struct yaffs_DeviceStruct *dev);
 
+        /* Debug control flags. Don't use unless you know what you're doing */
+       int useHeaderFileSize;  /* Flag to determine if we should use file sizes from the header */
+       int disableLazyLoad;    /* Disable lazy loading on this device */
        int wideTnodesDisabled; /* Set to disable wide tnodes */
+       int disableSoftDelete;  /* yaffs 1 only: Set to disable the use of softdeletion. */
+       
+       int deferDirectoryUpdate; /* Set to defer directory updates */
+
+#ifdef CONFIG_YAFFS_AUTO_UNICODE
+       int autoUnicode;
+#endif
+       int alwaysCheckErased; /* Force chunk erased check always on */
+};
 
-       YCHAR *pathDividers;    /* String of legal path dividers */
+typedef struct yaffs_DeviceParamStruct yaffs_DeviceParam;
 
+struct yaffs_DeviceStruct {
+       struct yaffs_DeviceParamStruct param;
 
-       /* End of stuff that must be set before initialisation. */
+        /* Context storage. Holds extra OS specific data for this device */
 
-       /* Checkpoint control. Can be set before or after initialisation */
-       __u8 skipCheckpointRead;
-       __u8 skipCheckpointWrite;
+       void *osContext;
+       void *driverContext;
+
+       struct ylist_head devList;
 
        /* Runtime parameters. Set up by YAFFS. */
+       int nDataBytesPerChunk; 
 
-       __u16 chunkGroupBits;   /* 0 for devices <= 32MB. else log2(nchunks) - 16 */
+        /* Non-wide tnode stuff */
+       __u16 chunkGroupBits;   /* Number of bits that need to be resolved if
+                                 * the tnodes are not wide enough.
+                                 */
        __u16 chunkGroupSize;   /* == 2^^chunkGroupBits */
 
        /* Stuff to support wide tnodes */
        __u32 tnodeWidth;
        __u32 tnodeMask;
+       __u32 tnodeSize;
 
        /* Stuff for figuring out file offset to chunk conversions */
        __u32 chunkShift; /* Shift value */
        __u32 chunkDiv;   /* Divisor after shifting: 1 for power-of-2 sizes */
        __u32 chunkMask;  /* Mask to use for power-of-2 case */
 
-       /* Stuff to handle inband tags */
-       int inbandTags;
-       __u32 totalBytesPerChunk;
-
-#ifdef __KERNEL__
-
-       struct semaphore sem;   /* Semaphore for waiting on erasure.*/
-       struct semaphore grossLock;     /* Gross locking semaphore */
-       __u8 *spareBuffer;      /* For mtdif2 use. Don't know the size of the buffer
-                                * at compile time so we have to allocate it.
-                                */
-       void (*putSuperFunc) (struct super_block *sb);
-#endif
 
-       int isMounted;
 
+       int isMounted;
+       int readOnly;
        int isCheckpointed;
 
 
@@ -682,51 +680,31 @@ struct yaffs_DeviceStruct {
        __u32 allocationPage;
        int allocationBlockFinder;      /* Used to search for next allocation block */
 
-       /* Runtime state */
-       int nTnodesCreated;
-       yaffs_Tnode *freeTnodes;
-       int nFreeTnodes;
-       yaffs_TnodeList *allocatedTnodeList;
-
-       int isDoingGC;
-       int gcBlock;
-       int gcChunk;
-
-       int nObjectsCreated;
-       yaffs_Object *freeObjects;
-       int nFreeObjects;
+       /* Object and Tnode memory management */
+       void *allocator;
+       int nObjects;
+       int nTnodes;
 
        int nHardLinks;
 
-       yaffs_ObjectList *allocatedObjectList;
-
        yaffs_ObjectBucket objectBucket[YAFFS_NOBJECT_BUCKETS];
+       __u32 bucketFinder;
 
        int nFreeChunks;
 
-       int currentDirtyChecker;        /* Used to find current dirtiest block */
-
+       /* Garbage collection control */
        __u32 *gcCleanupList;   /* objects to delete at the end of a GC. */
-       int nonAggressiveSkip;  /* GC state/mode */
+       __u32 nCleanups;
 
-       /* Statistcs */
-       int nPageWrites;
-       int nPageReads;
-       int nBlockErasures;
-       int nErasureFailures;
-       int nGCCopies;
-       int garbageCollections;
-       int passiveGarbageCollections;
-       int nRetriedWrites;
-       int nRetiredBlocks;
-       int eccFixed;
-       int eccUnfixed;
-       int tagsEccFixed;
-       int tagsEccUnfixed;
-       int nDeletions;
-       int nUnmarkedDeletions;
-
-       int hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
+       unsigned hasPendingPrioritisedGCs; /* We think this device might have pending prioritised gcs */
+       unsigned gcDisable;
+       unsigned gcBlockFinder;
+       unsigned gcDirtiest;
+       unsigned gcPagesInUse;
+       unsigned gcNotDone;
+       unsigned gcBlock;
+       unsigned gcChunk;
+       unsigned gcSkip;
 
        /* Special directories */
        yaffs_Object *rootDir;
@@ -743,8 +721,6 @@ struct yaffs_DeviceStruct {
        yaffs_ChunkCache *srCache;
        int srLastUse;
 
-       int cacheHits;
-
        /* Stuff for background deletion and unlinked files.*/
        yaffs_Object *unlinkedDir;      /* Directory where unlinked and deleted files live. */
        yaffs_Object *deletedDir;       /* Directory where deleted objects are sent to disappear. */
@@ -753,7 +729,6 @@ struct yaffs_DeviceStruct {
        int nUnlinkedFiles;             /* Count of unlinked files. */
        int nBackgroundDeletions;       /* Count of background deletions. */
 
-
        /* Temporary buffer management */
        yaffs_TempBuffer tempBuffer[YAFFS_N_TEMP_BUFFERS];
        int maxTemp;
@@ -764,6 +739,36 @@ struct yaffs_DeviceStruct {
        /* yaffs2 runtime stuff */
        unsigned sequenceNumber;        /* Sequence number of currently allocating block */
        unsigned oldestDirtySequence;
+       unsigned oldestDirtyBlock;
+
+       /* Block refreshing */
+       int refreshSkip;        /* A skip down counter. Refresh happens when this gets to zero. */
+
+       /* Dirty directory handling */
+       struct ylist_head dirtyDirectories; /* List of dirty directories */
+
+
+       /* Statistcs */
+       __u32 nPageWrites;
+       __u32 nPageReads;
+       __u32 nBlockErasures;
+       __u32 nErasureFailures;
+       __u32 nGCCopies;
+       __u32 allGCs;
+       __u32 passiveGCs;
+       __u32 oldestDirtyGCs;
+       __u32 nGCBlocks;
+       __u32 backgroundGCs;
+       __u32 nRetriedWrites;
+       __u32 nRetiredBlocks;
+       __u32 eccFixed;
+       __u32 eccUnfixed;
+       __u32 tagsEccFixed;
+       __u32 tagsEccUnfixed;
+       __u32 nDeletions;
+       __u32 nUnmarkedDeletions;
+       __u32 refreshCount;
+       __u32 cacheHits;
 
 };
 
@@ -796,7 +801,6 @@ typedef struct {
 
        /* yaffs2 runtime stuff */
        unsigned sequenceNumber;        /* Sequence number of currently allocating block */
-       unsigned oldestDirtySequence;
 
 } yaffs_CheckpointDevice;
 
@@ -809,6 +813,23 @@ typedef struct {
 } yaffs_CheckpointValidity;
 
 
+struct yaffs_ShadowFixerStruct {
+       int objectId;
+       int shadowedId;
+       struct yaffs_ShadowFixerStruct *next;
+};
+
+/* Structure for doing xattr modifications */
+typedef struct {
+       int set; /* If 0 then this is a deletion */
+       const YCHAR *name;
+       const void *data;
+       int size;
+       int flags;
+       int result;
+}yaffs_XAttrMod;
+
+
 /*----------------------- YAFFS Functions -----------------------*/
 
 int yaffs_GutsInitialise(yaffs_Device *dev);
@@ -840,7 +861,8 @@ int yaffs_ResizeFile(yaffs_Object *obj,
 
 yaffs_Object *yaffs_MknodFile(yaffs_Object *parent, const YCHAR *name,
                                __u32 mode, __u32 uid, __u32 gid);
-int yaffs_FlushFile(yaffs_Object *obj, int updateTime);
+
+int yaffs_FlushFile(yaffs_Object *obj, int updateTime, int dataSync);
 
 /* Flushing and checkpointing */
 void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
@@ -873,6 +895,12 @@ YCHAR *yaffs_GetSymlinkAlias(yaffs_Objec
 yaffs_Object *yaffs_MknodSpecial(yaffs_Object *parent, const YCHAR *name,
                                 __u32 mode, __u32 uid, __u32 gid, __u32 rdev);
 
+
+int yaffs_SetXAttribute(yaffs_Object *obj, const YCHAR *name, const void * value, int size, int flags);
+int yaffs_GetXAttribute(yaffs_Object *obj, const YCHAR *name, void *value, int size);
+int yaffs_ListXAttributes(yaffs_Object *obj, char *buffer, int size);
+int yaffs_RemoveXAttribute(yaffs_Object *obj, const YCHAR *name);
+
 /* Special directories */
 yaffs_Object *yaffs_Root(yaffs_Device *dev);
 yaffs_Object *yaffs_LostNFound(yaffs_Device *dev);
@@ -882,18 +910,18 @@ yaffs_Object *yaffs_LostNFound(yaffs_Dev
 void yfsd_WinFileTimeNow(__u32 target[2]);
 #endif
 
-#ifdef __KERNEL__
-
 void yaffs_HandleDeferedFree(yaffs_Object *obj);
-#endif
+
+void yaffs_UpdateDirtyDirectories(yaffs_Device *dev);
+
+int yaffs_BackgroundGarbageCollect(yaffs_Device *dev, unsigned urgency);
 
 /* Debug dump  */
 int yaffs_DumpObject(yaffs_Object *obj);
 
 void yaffs_GutsTest(yaffs_Device *dev);
 
-/* A few useful functions */
-void yaffs_InitialiseTags(yaffs_ExtendedTags *tags);
+/* A few useful functions to be used within the core files*/
 void yaffs_DeleteChunk(yaffs_Device *dev, int chunkId, int markNAND, int lyn);
 int yaffs_CheckFF(__u8 *buffer, int nBytes);
 void yaffs_HandleChunkError(yaffs_Device *dev, yaffs_BlockInfo *bi);
@@ -901,4 +929,41 @@ void yaffs_HandleChunkError(yaffs_Device
 __u8 *yaffs_GetTempBuffer(yaffs_Device *dev, int lineNo);
 void yaffs_ReleaseTempBuffer(yaffs_Device *dev, __u8 *buffer, int lineNo);
 
+yaffs_Object *yaffs_FindOrCreateObjectByNumber(yaffs_Device *dev,
+                                               int number,
+                                               yaffs_ObjectType type);
+int yaffs_PutChunkIntoFile(yaffs_Object *in, int chunkInInode,
+                               int chunkInNAND, int inScan);
+void yaffs_SetObjectName(yaffs_Object *obj, const YCHAR *name);
+void yaffs_SetObjectNameFromOH(yaffs_Object *obj, const yaffs_ObjectHeader *oh);
+void yaffs_AddObjectToDirectory(yaffs_Object *directory,
+                                       yaffs_Object *obj);
+YCHAR *yaffs_CloneString(const YCHAR *str);
+void yaffs_HardlinkFixup(yaffs_Device *dev, yaffs_Object *hardList);
+void yaffs_BlockBecameDirty(yaffs_Device *dev, int blockNo);
+int yaffs_UpdateObjectHeader(yaffs_Object *in, const YCHAR *name,
+                               int force, int isShrink, int shadows,
+                                yaffs_XAttrMod *xop);
+void yaffs_HandleShadowedObject(yaffs_Device *dev, int objId,
+                               int backwardScanning);
+int yaffs_CheckSpaceForAllocation(yaffs_Device *dev, int nChunks);
+yaffs_Tnode *yaffs_GetTnode(yaffs_Device *dev);
+yaffs_Tnode *yaffs_AddOrFindLevel0Tnode(yaffs_Device *dev,
+                                       yaffs_FileStructure *fStruct,
+                                       __u32 chunkId,
+                                       yaffs_Tnode *passedTn);
+
+int yaffs_DoWriteDataToFile(yaffs_Object *in, const __u8 *buffer, loff_t offset,
+                       int nBytes, int writeThrough);
+void yaffs_ResizeDown( yaffs_Object *obj, loff_t newSize);
+void yaffs_SkipRestOfBlock(yaffs_Device *dev);
+
+int yaffs_CountFreeChunks(yaffs_Device *dev);
+
+yaffs_Tnode *yaffs_FindLevel0Tnode(yaffs_Device *dev,
+                               yaffs_FileStructure *fStruct,
+                               __u32 chunkId);
+
+__u32 yaffs_GetChunkGroupBase(yaffs_Device *dev, yaffs_Tnode *tn, unsigned pos);
+
 #endif
--- a/fs/yaffs2/yaffsinterface.h
+++ b/fs/yaffs2/yaffsinterface.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- /dev/null
+++ b/fs/yaffs2/yaffs_linux_allocator.c
@@ -0,0 +1,200 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ *
+ * Note: Tis code is currently unused. Being checked in in case it becomes useful.
+ */
+
+
+#include "yaffs_allocator.h"
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yportenv.h"
+#include "yaffs_linux.h"
+/*
+ * Start out with the same allocator as yaffs direct.
+ * Todo: Change to Linux slab allocator.
+ */
+
+
+
+#define NAMELEN  20
+struct yaffs_AllocatorStruct {
+       char tnode_name[NAMELEN+1];
+       char object_name[NAMELEN+1];
+       struct kmem_cache *tnode_cache;
+       struct kmem_cache *object_cache;
+};
+
+typedef struct yaffs_AllocatorStruct yaffs_Allocator;
+
+int mount_id;
+
+void yaffs_DeinitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator = (yaffs_Allocator *)dev->allocator;
+
+       T(YAFFS_TRACE_ALLOCATE,(TSTR("Deinitialising yaffs allocator\n")));
+
+       if(allocator){
+               if(allocator->tnode_cache){
+                       kmem_cache_destroy(allocator->tnode_cache);
+                       allocator->tnode_cache = NULL;
+               } else {
+                       T(YAFFS_TRACE_ALWAYS,
+                               (TSTR("NULL tnode cache\n")));
+                       YBUG();
+               }
+
+               if(allocator->object_cache){
+                       kmem_cache_destroy(allocator->object_cache);
+                       allocator->object_cache = NULL;
+               } else {
+                       T(YAFFS_TRACE_ALWAYS,
+                               (TSTR("NULL object cache\n")));
+                       YBUG();
+               }
+
+               YFREE(allocator);
+
+       } else {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("Deinitialising NULL allocator\n")));
+               YBUG();
+       }
+       dev->allocator = NULL;
+}
+
+
+static void fake_ctor0(void *data){data = data;}
+static void fake_ctor1(void *data){data = data;}
+static void fake_ctor2(void *data){data = data;}
+static void fake_ctor3(void *data){data = data;}
+static void fake_ctor4(void *data){data = data;}
+static void fake_ctor5(void *data){data = data;}
+static void fake_ctor6(void *data){data = data;}
+static void fake_ctor7(void *data){data = data;}
+static void fake_ctor8(void *data){data = data;}
+static void fake_ctor9(void *data){data = data;}
+
+static void (*fake_ctor_list[10]) (void *) = {
+       fake_ctor0,
+       fake_ctor1,
+       fake_ctor2,
+       fake_ctor3,
+       fake_ctor4,
+       fake_ctor5,
+       fake_ctor6,
+       fake_ctor7,
+       fake_ctor8,
+       fake_ctor9,
+};
+
+void yaffs_InitialiseRawTnodesAndObjects(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator;
+       unsigned mount_id = yaffs_DeviceToLC(dev)->mount_id;
+
+       T(YAFFS_TRACE_ALLOCATE,(TSTR("Initialising yaffs allocator\n")));
+
+       if(dev->allocator)
+               YBUG();
+       else if(mount_id >= 10){
+               T(YAFFS_TRACE_ALWAYS,(TSTR("Bad mount_id %u\n"),mount_id));
+       } else {
+                allocator = YMALLOC(sizeof(yaffs_Allocator));
+                memset(allocator,0,sizeof(yaffs_Allocator));
+                dev->allocator = allocator;
+
+               if(!dev->allocator){
+                       T(YAFFS_TRACE_ALWAYS,
+                               (TSTR("yaffs allocator creation failed\n")));
+                       YBUG();
+                       return;
+
+               }
+
+               sprintf(allocator->tnode_name,"yaffs_t_%u",mount_id);
+               sprintf(allocator->object_name,"yaffs_o_%u",mount_id);
+
+               allocator->tnode_cache =
+                       kmem_cache_create(allocator->tnode_name,
+                               dev->tnodeSize,
+                               0, 0,
+                               fake_ctor_list[mount_id]);
+               if(allocator->tnode_cache)
+                       T(YAFFS_TRACE_ALLOCATE,
+                               (TSTR("tnode cache \"%s\" %p\n"),
+                               allocator->tnode_name,allocator->tnode_cache));
+               else {
+                       T(YAFFS_TRACE_ALWAYS,
+                               (TSTR("yaffs cache creation failed\n")));
+                       YBUG();
+               }
+
+
+               allocator->object_cache = 
+                       kmem_cache_create(allocator->object_name,
+                               sizeof(yaffs_Object),
+                               0, 0,
+                               fake_ctor_list[mount_id]);
+
+               if(allocator->object_cache)
+                       T(YAFFS_TRACE_ALLOCATE,
+                               (TSTR("object cache \"%s\" %p\n"),
+                               allocator->object_name,allocator->object_cache));
+
+               else {
+                       T(YAFFS_TRACE_ALWAYS,
+                               (TSTR("yaffs cache creation failed\n")));
+                       YBUG();
+               }
+       } 
+}
+
+
+yaffs_Tnode *yaffs_AllocateRawTnode(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+       if(!allocator || !allocator->tnode_cache){
+               YBUG();
+               return NULL;
+       }
+       return kmem_cache_alloc(allocator->tnode_cache, GFP_NOFS);
+}
+
+void yaffs_FreeRawTnode(yaffs_Device *dev, yaffs_Tnode *tn)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+       kmem_cache_free(allocator->tnode_cache,tn);
+}
+
+yaffs_Object *yaffs_AllocateRawObject(yaffs_Device *dev)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+       if(!allocator){
+               YBUG();
+               return NULL;
+       }
+       if(!allocator->object_cache){
+               YBUG();
+               return NULL;
+       }
+       return kmem_cache_alloc(allocator->object_cache, GFP_NOFS);
+}
+
+void yaffs_FreeRawObject(yaffs_Device *dev, yaffs_Object *obj)
+{
+       yaffs_Allocator *allocator = dev->allocator;
+       kmem_cache_free(allocator->object_cache,obj);
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_linux.h
@@ -0,0 +1,43 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_LINUX_H__
+#define __YAFFS_LINUX_H__
+
+#include "devextras.h"
+#include "yportenv.h"
+
+struct yaffs_LinuxContext {
+       struct ylist_head       contextList; /* List of these we have mounted */
+       struct yaffs_DeviceStruct *dev;
+       struct super_block * superBlock;
+       struct task_struct *bgThread; /* Background thread for this device */
+       int bgRunning;
+        struct semaphore grossLock;     /* Gross locking semaphore */
+       __u8 *spareBuffer;      /* For mtdif2 use. Don't know the size of the buffer
+                                * at compile time so we have to allocate it.
+                                */
+       struct ylist_head searchContexts;
+       void (*putSuperFunc)(struct super_block *sb);
+
+       struct task_struct *readdirProcess;
+       unsigned mount_id;
+};
+
+#define yaffs_DeviceToLC(dev) ((struct yaffs_LinuxContext *)((dev)->osContext))
+#define yaffs_DeviceToMtd(dev) ((struct mtd_info *)((dev)->driverContext))
+
+#endif
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_list.h
@@ -0,0 +1,127 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+/*
+ * This file is just holds extra declarations of macros that would normally
+ * be providesd in the Linux kernel. These macros have been written from
+ * scratch but are functionally equivalent to the Linux ones.
+ *
+ */
+
+#ifndef __YAFFS_LIST_H__
+#define __YAFFS_LIST_H__
+
+
+#include "yportenv.h"
+
+/*
+ * This is a simple doubly linked list implementation that matches the
+ * way the Linux kernel doubly linked list implementation works.
+ */
+
+struct ylist_head {
+       struct ylist_head *next; /* next in chain */
+       struct ylist_head *prev; /* previous in chain */
+};
+
+
+/* Initialise a static list */
+#define YLIST_HEAD(name) \
+struct ylist_head name = { &(name), &(name)}
+
+
+
+/* Initialise a list head to an empty list */
+#define YINIT_LIST_HEAD(p) \
+do { \
+       (p)->next = (p);\
+       (p)->prev = (p); \
+} while (0)
+
+
+/* Add an element to a list */
+static Y_INLINE void ylist_add(struct ylist_head *newEntry,
+                               struct ylist_head *list)
+{
+       struct ylist_head *listNext = list->next;
+
+       list->next = newEntry;
+       newEntry->prev = list;
+       newEntry->next = listNext;
+       listNext->prev = newEntry;
+
+}
+
+static Y_INLINE void ylist_add_tail(struct ylist_head *newEntry,
+                                struct ylist_head *list)
+{
+       struct ylist_head *listPrev = list->prev;
+
+       list->prev = newEntry;
+       newEntry->next = list;
+       newEntry->prev = listPrev;
+       listPrev->next = newEntry;
+
+}
+
+
+/* Take an element out of its current list, with or without
+ * reinitialising the links.of the entry*/
+static Y_INLINE void ylist_del(struct ylist_head *entry)
+{
+       struct ylist_head *listNext = entry->next;
+       struct ylist_head *listPrev = entry->prev;
+
+       listNext->prev = listPrev;
+       listPrev->next = listNext;
+
+}
+
+static Y_INLINE void ylist_del_init(struct ylist_head *entry)
+{
+       ylist_del(entry);
+       entry->next = entry->prev = entry;
+}
+
+
+/* Test if the list is empty */
+static Y_INLINE int ylist_empty(struct ylist_head *entry)
+{
+       return (entry->next == entry);
+}
+
+
+/* ylist_entry takes a pointer to a list entry and offsets it to that
+ * we can find a pointer to the object it is embedded in.
+ */
+
+
+#define ylist_entry(entry, type, member) \
+       ((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
+
+
+/* ylist_for_each and list_for_each_safe  iterate over lists.
+ * ylist_for_each_safe uses temporary storage to make the list delete safe
+ */
+
+#define ylist_for_each(itervar, list) \
+       for (itervar = (list)->next; itervar != (list); itervar = itervar->next)
+
+#define ylist_for_each_safe(itervar, saveVar, list) \
+       for (itervar = (list)->next, saveVar = (list)->next->next; \
+               itervar != (list); itervar = saveVar, saveVar = saveVar->next)
+
+
+#endif
--- a/fs/yaffs2/yaffs_mtdif1.c
+++ b/fs/yaffs2/yaffs_mtdif1.c
@@ -2,7 +2,7 @@
  * YAFFS: Yet another FFS. A NAND-flash specific file system.
  * yaffs_mtdif1.c  NAND mtd interface functions for small-page NAND.
  *
- * Copyright (C) 2002 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * This program is free software; you can redistribute it and/or modify
@@ -24,9 +24,11 @@
  */
 
 #include "yportenv.h"
+#include "yaffs_trace.h"
 #include "yaffs_guts.h"
 #include "yaffs_packedtags1.h"
 #include "yaffs_tagscompat.h"  /* for yaffs_CalcTagsECC */
+#include "yaffs_linux.h"
 
 #include "linux/kernel.h"
 #include "linux/version.h"
@@ -36,8 +38,6 @@
 /* Don't compile this module if we don't have MTD's mtd_oob_ops interface */
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
 
-const char *yaffs_mtdif1_c_version = "$Id: yaffs_mtdif1.c,v 1.10 2009-03-09 07:41:10 charles Exp $";
-
 #ifndef CONFIG_YAFFS_9BYTE_TAGS
 # define YTAG1_SIZE 8
 #else
@@ -91,7 +91,7 @@ static struct nand_ecclayout nand_oob_16
 int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
        int chunkInNAND, const __u8 *data, const yaffs_ExtendedTags *etags)
 {
-       struct mtd_info *mtd = dev->genericDevice;
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
        int chunkBytes = dev->nDataBytesPerChunk;
        loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
        struct mtd_oob_ops ops;
@@ -102,8 +102,6 @@ int nandmtd1_WriteChunkWithTagsToNAND(ya
        compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
        compile_time_assertion(sizeof(yaffs_Tags) == 8);
 
-       dev->nPageWrites++;
-
        yaffs_PackTags1(&pt1, etags);
        yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
 
@@ -137,9 +135,9 @@ int nandmtd1_WriteChunkWithTagsToNAND(ya
 
        retval = mtd->write_oob(mtd, addr, &ops);
        if (retval) {
-               yaffs_trace(YAFFS_TRACE_MTD,
-                       "write_oob failed, chunk %d, mtd error %d\n",
-                       chunkInNAND, retval);
+               T(YAFFS_TRACE_MTD,
+                       (TSTR("write_oob failed, chunk %d, mtd error %d"TENDSTR),
+                       chunkInNAND, retval));
        }
        return retval ? YAFFS_FAIL : YAFFS_OK;
 }
@@ -171,7 +169,7 @@ static int rettags(yaffs_ExtendedTags *e
 int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
        int chunkInNAND, __u8 *data, yaffs_ExtendedTags *etags)
 {
-       struct mtd_info *mtd = dev->genericDevice;
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
        int chunkBytes = dev->nDataBytesPerChunk;
        loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
        int eccres = YAFFS_ECC_RESULT_NO_ERROR;
@@ -180,8 +178,6 @@ int nandmtd1_ReadChunkWithTagsFromNAND(y
        int retval;
        int deleted;
 
-       dev->nPageReads++;
-
        memset(&ops, 0, sizeof(ops));
        ops.mode = MTD_OOB_AUTO;
        ops.len = (data) ? chunkBytes : 0;
@@ -200,9 +196,9 @@ int nandmtd1_ReadChunkWithTagsFromNAND(y
         */
        retval = mtd->read_oob(mtd, addr, &ops);
        if (retval) {
-               yaffs_trace(YAFFS_TRACE_MTD,
-                       "read_oob failed, chunk %d, mtd error %d\n",
-                       chunkInNAND, retval);
+               T(YAFFS_TRACE_MTD,
+                       (TSTR("read_oob failed, chunk %d, mtd error %d"TENDSTR),
+                       chunkInNAND, retval));
        }
 
        switch (retval) {
@@ -284,11 +280,11 @@ int nandmtd1_ReadChunkWithTagsFromNAND(y
  */
 int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 {
-       struct mtd_info *mtd = dev->genericDevice;
-       int blocksize = dev->nChunksPerBlock * dev->nDataBytesPerChunk;
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
+       int blocksize = dev->param.nChunksPerBlock * dev->nDataBytesPerChunk;
        int retval;
 
-       yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad\n", blockNo);
+       T(YAFFS_TRACE_BAD_BLOCKS,(TSTR("marking block %d bad"TENDSTR), blockNo));
 
        retval = mtd->block_markbad(mtd, (loff_t)blocksize * blockNo);
        return (retval) ? YAFFS_FAIL : YAFFS_OK;
@@ -305,9 +301,9 @@ static int nandmtd1_TestPrerequists(stru
        int oobavail = mtd->ecclayout->oobavail;
 
        if (oobavail < YTAG1_SIZE) {
-               yaffs_trace(YAFFS_TRACE_ERROR,
-                       "mtd device has only %d bytes for tags, need %d\n",
-                       oobavail, YTAG1_SIZE);
+               T(YAFFS_TRACE_ERROR,
+                       (TSTR("mtd device has only %d bytes for tags, need %d"TENDSTR),
+                       oobavail, YTAG1_SIZE));
                return YAFFS_FAIL;
        }
        return YAFFS_OK;
@@ -325,8 +321,8 @@ static int nandmtd1_TestPrerequists(stru
 int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
        yaffs_BlockState *pState, __u32 *pSequenceNumber)
 {
-       struct mtd_info *mtd = dev->genericDevice;
-       int chunkNo = blockNo * dev->nChunksPerBlock;
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
+       int chunkNo = blockNo * dev->param.nChunksPerBlock;
        loff_t addr = (loff_t)chunkNo * dev->nDataBytesPerChunk;
        yaffs_ExtendedTags etags;
        int state = YAFFS_BLOCK_STATE_DEAD;
@@ -342,8 +338,8 @@ int nandmtd1_QueryNANDBlock(struct yaffs
        retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
        etags.blockBad = (mtd->block_isbad)(mtd, addr);
        if (etags.blockBad) {
-               yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
-                       "block %d is marked bad\n", blockNo);
+               T(YAFFS_TRACE_BAD_BLOCKS,
+                       (TSTR("block %d is marked bad"TENDSTR), blockNo));
                state = YAFFS_BLOCK_STATE_DEAD;
        } else if (etags.eccResult != YAFFS_ECC_RESULT_NO_ERROR) {
                /* bad tags, need to look more closely */
--- a/fs/yaffs2/yaffs_mtdif1-compat.c
+++ /dev/null
@@ -1,434 +0,0 @@
-From ian@brightstareng.com Fri May 18 15:06:49 2007
-From ian@brightstareng.com Fri May 18 15:08:21 2007
-Received: from 206.173.66.57.ptr.us.xo.net ([206.173.66.57] helo=zebra.brightstareng.com)
-       by apollo.linkchoose.co.uk with esmtp (Exim 4.60)
-       (envelope-from <ian@brightstareng.com>)
-       id 1Hp380-00011e-T6
-       for david.goodenough@linkchoose.co.uk; Fri, 18 May 2007 15:08:21 +0100
-Received: from localhost (localhost.localdomain [127.0.0.1])
-       by zebra.brightstareng.com (Postfix) with ESMTP
-       id 4819F28C004; Fri, 18 May 2007 10:07:49 -0400 (EDT)
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-From: Ian McDonnell <ian@brightstareng.com>
-To: David Goodenough <david.goodenough@linkchoose.co.uk>
-Subject: Re: something tested this time -- yaffs_mtdif1-compat.c
-Date: Fri, 18 May 2007 10:06:49 -0400
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-References: <200705142207.06909.ian@brightstareng.com> <200705171131.53536.ian@brightstareng.com> <200705181334.32166.david.goodenough@linkchoose.co.uk>
-In-Reply-To: <200705181334.32166.david.goodenough@linkchoose.co.uk>
-Cc: Andrea Conti <alyf@alyf.net>,
- Charles Manning <manningc2@actrix.gen.nz>
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---Boundary-00=_5LbTGmt62YoutxM
-Content-Type: text/plain;
-  charset="iso-8859-15"
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-
-David, Andrea,
-
-On Friday 18 May 2007 08:34, you wrote:
-> Yea team.  With this fix in place (I put it in the wrong place
-> at first) I can now mount and ls the Yaffs partition without
-> an error messages!
-
-Good news!
-
-Attached is a newer yaffs_mtdif1.c with a bandaid to help the
-2.6.18 and 2.6.19 versions of MTD not trip on the oob read.
-See the LINUX_VERSION_CODE conditional in
-nandmtd1_ReadChunkWithTagsFromNAND.
-
--imcd
-
---Boundary-00=_5LbTGmt62YoutxM
-Content-Type: text/x-csrc;
-  charset="iso-8859-15";
-  name="yaffs_mtdif1.c"
-Content-Transfer-Encoding: 7bit
-Content-Disposition: attachment;
-       filename="yaffs_mtdif1.c"
-
-/*
- * YAFFS: Yet another FFS. A NAND-flash specific file system.
- * yaffs_mtdif1.c  NAND mtd interface functions for small-page NAND.
- *
- * Copyright (C) 2002 Aleph One Ltd.
- *   for Toby Churchill Ltd and Brightstar Engineering
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- */
-
-/*
- * This module provides the interface between yaffs_nand.c and the
- * MTD API.  This version is used when the MTD interface supports the
- * 'mtd_oob_ops' style calls to read_oob and write_oob, circa 2.6.17,
- * and we have small-page NAND device.
- *
- * These functions are invoked via function pointers in yaffs_nand.c.
- * This replaces functionality provided by functions in yaffs_mtdif.c
- * and the yaffs_TagsCompatability functions in yaffs_tagscompat.c that are
- * called in yaffs_mtdif.c when the function pointers are NULL.
- * We assume the MTD layer is performing ECC (useNANDECC is true).
- */
-
-#include "yportenv.h"
-#include "yaffs_guts.h"
-#include "yaffs_packedtags1.h"
-#include "yaffs_tagscompat.h"  // for yaffs_CalcTagsECC
-
-#include "linux/kernel.h"
-#include "linux/version.h"
-#include "linux/types.h"
-#include "linux/mtd/mtd.h"
-
-/* Don't compile this module if we don't have MTD's mtd_oob_ops interface */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,17))
-
-const char *yaffs_mtdif1_c_version = "$Id$";
-
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-# define YTAG1_SIZE 8
-#else
-# define YTAG1_SIZE 9
-#endif
-
-#if 0
-/* Use the following nand_ecclayout with MTD when using
- * CONFIG_YAFFS_9BYTE_TAGS and the older on-NAND tags layout.
- * If you have existing Yaffs images and the byte order differs from this,
- * adjust 'oobfree' to match your existing Yaffs data.
- *
- * This nand_ecclayout scatters/gathers to/from the old-yaffs layout with the
- * pageStatus byte (at NAND spare offset 4) scattered/gathered from/to
- * the 9th byte.
- *
- * Old-style on-NAND format: T0,T1,T2,T3,P,B,T4,T5,E0,E1,E2,T6,T7,E3,E4,E5
- * We have/need PackedTags1 plus pageStatus: T0,T1,T2,T3,T4,T5,T6,T7,P
- * where Tn are the tag bytes, En are MTD's ECC bytes, P is the pageStatus
- * byte and B is the small-page bad-block indicator byte.
- */
-static struct nand_ecclayout nand_oob_16 = {
-       .eccbytes = 6,
-       .eccpos = { 8, 9, 10, 13, 14, 15 },
-       .oobavail = 9,
-       .oobfree = { { 0, 4 }, { 6, 2 }, { 11, 2 }, { 4, 1 } }
-};
-#endif
-
-/* Write a chunk (page) of data to NAND.
- *
- * Caller always provides ExtendedTags data which are converted to a more
- * compact (packed) form for storage in NAND.  A mini-ECC runs over the
- * contents of the tags meta-data; used to valid the tags when read.
- *
- *  - Pack ExtendedTags to PackedTags1 form
- *  - Compute mini-ECC for PackedTags1
- *  - Write data and packed tags to NAND.
- *
- * Note: Due to the use of the PackedTags1 meta-data which does not include
- * a full sequence number (as found in the larger PackedTags2 form) it is
- * necessary for Yaffs to re-write a chunk/page (just once) to mark it as
- * discarded and dirty.  This is not ideal: newer NAND parts are supposed
- * to be written just once.  When Yaffs performs this operation, this
- * function is called with a NULL data pointer -- calling MTD write_oob
- * without data is valid usage (2.6.17).
- *
- * Any underlying MTD error results in YAFFS_FAIL.
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-int nandmtd1_WriteChunkWithTagsToNAND(yaffs_Device *dev,
-       int chunkInNAND, const __u8 * data, const yaffs_ExtendedTags * etags)
-{
-       struct mtd_info * mtd = dev->genericDevice;
-       int chunkBytes = dev->nDataBytesPerChunk;
-       loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
-       struct mtd_oob_ops ops;
-       yaffs_PackedTags1 pt1;
-       int retval;
-
-       /* we assume that PackedTags1 and yaffs_Tags are compatible */
-       compile_time_assertion(sizeof(yaffs_PackedTags1) == 12);
-       compile_time_assertion(sizeof(yaffs_Tags) == 8);
-
-       yaffs_PackTags1(&pt1, etags);
-       yaffs_CalcTagsECC((yaffs_Tags *)&pt1);
-
-       /* When deleting a chunk, the upper layer provides only skeletal
-        * etags, one with chunkDeleted set.  However, we need to update the
-        * tags, not erase them completely.  So we use the NAND write property
-        * that only zeroed-bits stick and set tag bytes to all-ones and
-        * zero just the (not) deleted bit.
-        */
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-       if (etags->chunkDeleted) {
-               memset(&pt1, 0xff, 8);
-               /* clear delete status bit to indicate deleted */
-               pt1.deleted = 0;
-       }
-#else
-       ((__u8 *)&pt1)[8] = 0xff;
-       if (etags->chunkDeleted) {
-               memset(&pt1, 0xff, 8);
-               /* zero pageStatus byte to indicate deleted */
-               ((__u8 *)&pt1)[8] = 0;
-       }
-#endif
-
-       memset(&ops, 0, sizeof(ops));
-       ops.mode = MTD_OOB_AUTO;
-       ops.len = (data) ? chunkBytes : 0;
-       ops.ooblen = YTAG1_SIZE;
-       ops.datbuf = (__u8 *)data;
-       ops.oobbuf = (__u8 *)&pt1;
-
-       retval = mtd->write_oob(mtd, addr, &ops);
-       if (retval) {
-               yaffs_trace(YAFFS_TRACE_MTD,
-                       "write_oob failed, chunk %d, mtd error %d\n",
-                       chunkInNAND, retval);
-       }
-       return retval ? YAFFS_FAIL : YAFFS_OK;
-}
-
-/* Return with empty ExtendedTags but add eccResult.
- */
-static int rettags(yaffs_ExtendedTags * etags, int eccResult, int retval)
-{
-       if (etags) {
-               memset(etags, 0, sizeof(*etags));
-               etags->eccResult = eccResult;
-       }
-       return retval;
-}
-
-/* Read a chunk (page) from NAND.
- *
- * Caller expects ExtendedTags data to be usable even on error; that is,
- * all members except eccResult and blockBad are zeroed.
- *
- *  - Check ECC results for data (if applicable)
- *  - Check for blank/erased block (return empty ExtendedTags if blank)
- *  - Check the PackedTags1 mini-ECC (correct if necessary/possible)
- *  - Convert PackedTags1 to ExtendedTags
- *  - Update eccResult and blockBad members to refect state.
- *
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-int nandmtd1_ReadChunkWithTagsFromNAND(yaffs_Device *dev,
-       int chunkInNAND, __u8 * data, yaffs_ExtendedTags * etags)
-{
-       struct mtd_info * mtd = dev->genericDevice;
-       int chunkBytes = dev->nDataBytesPerChunk;
-       loff_t addr = ((loff_t)chunkInNAND) * chunkBytes;
-       int eccres = YAFFS_ECC_RESULT_NO_ERROR;
-       struct mtd_oob_ops ops;
-       yaffs_PackedTags1 pt1;
-       int retval;
-       int deleted;
-
-       memset(&ops, 0, sizeof(ops));
-       ops.mode = MTD_OOB_AUTO;
-       ops.len = (data) ? chunkBytes : 0;
-       ops.ooblen = YTAG1_SIZE;
-       ops.datbuf = data;
-       ops.oobbuf = (__u8 *)&pt1;
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,20))
-       /* In MTD 2.6.18 to 2.6.19 nand_base.c:nand_do_read_oob() has a bug;
-        * help it out with ops.len = ops.ooblen when ops.datbuf == NULL.
-        */
-       ops.len = (ops.datbuf) ? ops.len : ops.ooblen;
-#endif
-       /* Read page and oob using MTD.
-        * Check status and determine ECC result.
-        */
-       retval = mtd->read_oob(mtd, addr, &ops);
-       if (retval) {
-               yaffs_trace(YAFFS_TRACE_MTD,
-                       "read_oob failed, chunk %d, mtd error %d\n",
-                       chunkInNAND, retval);
-       }
-
-       switch (retval) {
-       case 0:
-               /* no error */
-               break;
-
-       case -EUCLEAN:
-               /* MTD's ECC fixed the data */
-               eccres = YAFFS_ECC_RESULT_FIXED;
-               dev->eccFixed++;
-               break;
-
-       case -EBADMSG:
-               /* MTD's ECC could not fix the data */
-               dev->eccUnfixed++;
-               /* fall into... */
-       default:
-               rettags(etags, YAFFS_ECC_RESULT_UNFIXED, 0);
-               etags->blockBad = (mtd->block_isbad)(mtd, addr);
-               return YAFFS_FAIL;
-       }
-
-       /* Check for a blank/erased chunk.
-        */
-       if (yaffs_CheckFF((__u8 *)&pt1, 8)) {
-               /* when blank, upper layers want eccResult to be <= NO_ERROR */
-               return rettags(etags, YAFFS_ECC_RESULT_NO_ERROR, YAFFS_OK);
-       }
-
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-       /* Read deleted status (bit) then return it to it's non-deleted
-        * state before performing tags mini-ECC check. pt1.deleted is
-        * inverted.
-        */
-       deleted = !pt1.deleted;
-       pt1.deleted = 1;
-#else
-       (void) deleted; /* not used */
-#endif
-
-       /* Check the packed tags mini-ECC and correct if necessary/possible.
-        */
-       retval = yaffs_CheckECCOnTags((yaffs_Tags *)&pt1);
-       switch (retval) {
-       case 0:
-               /* no tags error, use MTD result */
-               break;
-       case 1:
-               /* recovered tags-ECC error */
-               dev->tagsEccFixed++;
-               eccres = YAFFS_ECC_RESULT_FIXED;
-               break;
-       default:
-               /* unrecovered tags-ECC error */
-               dev->tagsEccUnfixed++;
-               return rettags(etags, YAFFS_ECC_RESULT_UNFIXED, YAFFS_FAIL);
-       }
-
-       /* Unpack the tags to extended form and set ECC result.
-        * [set shouldBeFF just to keep yaffs_UnpackTags1 happy]
-        */
-       pt1.shouldBeFF = 0xFFFFFFFF;
-       yaffs_UnpackTags1(etags, &pt1);
-       etags->eccResult = eccres;
-
-       /* Set deleted state.
-        */
-#ifndef CONFIG_YAFFS_9BYTE_TAGS
-       etags->chunkDeleted = deleted;
-#else
-       etags->chunkDeleted = (yaffs_CountBits(((__u8 *)&pt1)[8]) < 7);
-#endif
-       return YAFFS_OK;
-}
-
-/* Mark a block bad.
- *
- * This is a persistant state.
- * Use of this function should be rare.
- *
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-int nandmtd1_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
-{
-       struct mtd_info * mtd = dev->genericDevice;
-       int blocksize = dev->nChunksPerBlock * dev->nDataBytesPerChunk;
-       int retval;
-
-       yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", blockNo);
-
-       retval = mtd->block_markbad(mtd, (loff_t)blocksize * blockNo);
-       return (retval) ? YAFFS_FAIL : YAFFS_OK;
-}
-
-/* Check any MTD prerequists.
- *
- * Returns YAFFS_OK or YAFFS_FAIL.
- */
-static int nandmtd1_TestPrerequists(struct mtd_info * mtd)
-{
-       /* 2.6.18 has mtd->ecclayout->oobavail */
-       /* 2.6.21 has mtd->ecclayout->oobavail and mtd->oobavail */
-       int oobavail = mtd->ecclayout->oobavail;
-
-       if (oobavail < YTAG1_SIZE) {
-               yaffs_trace(YAFFS_TRACE_ERROR,
-                       "mtd device has only %d bytes for tags, need %d",
-                       oobavail, YTAG1_SIZE);
-               return YAFFS_FAIL;
-       }
-       return YAFFS_OK;
-}
-
-/* Query for the current state of a specific block.
- *
- * Examine the tags of the first chunk of the block and return the state:
- *  - YAFFS_BLOCK_STATE_DEAD, the block is marked bad
- *  - YAFFS_BLOCK_STATE_NEEDS_SCANNING, the block is in use
- *  - YAFFS_BLOCK_STATE_EMPTY, the block is clean
- *
- * Always returns YAFFS_OK.
- */
-int nandmtd1_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
-       yaffs_BlockState * pState, int *pSequenceNumber)
-{
-       struct mtd_info * mtd = dev->genericDevice;
-       int chunkNo = blockNo * dev->nChunksPerBlock;
-       yaffs_ExtendedTags etags;
-       int state = YAFFS_BLOCK_STATE_DEAD;
-       int seqnum = 0;
-       int retval;
-
-       /* We don't yet have a good place to test for MTD config prerequists.
-        * Do it here as we are called during the initial scan.
-        */
-       if (nandmtd1_TestPrerequists(mtd) != YAFFS_OK) {
-               return YAFFS_FAIL;
-       }
-
-       retval = nandmtd1_ReadChunkWithTagsFromNAND(dev, chunkNo, NULL, &etags);
-       if (etags.blockBad) {
-               yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
-                       "block %d is marked bad", blockNo);
-               state = YAFFS_BLOCK_STATE_DEAD;
-       }
-       else if (etags.chunkUsed) {
-               state = YAFFS_BLOCK_STATE_NEEDS_SCANNING;
-               seqnum = etags.sequenceNumber;
-       }
-       else {
-               state = YAFFS_BLOCK_STATE_EMPTY;
-       }
-
-       *pState = state;
-       *pSequenceNumber = seqnum;
-
-       /* query always succeeds */
-       return YAFFS_OK;
-}
-
-#endif /*KERNEL_VERSION*/
-
---Boundary-00=_5LbTGmt62YoutxM--
-
-
-
--- a/fs/yaffs2/yaffs_mtdif1.h
+++ b/fs/yaffs2/yaffs_mtdif1.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * This program is free software; you can redistribute it and/or modify
--- a/fs/yaffs2/yaffs_mtdif2.c
+++ b/fs/yaffs2/yaffs_mtdif2.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,11 +13,8 @@
 
 /* mtd interface for YAFFS2 */
 
-const char *yaffs_mtdif2_c_version =
-       "$Id: yaffs_mtdif2.c,v 1.23 2009-03-06 17:20:53 wookey Exp $";
-
 #include "yportenv.h"
-
+#include "yaffs_trace.h"
 
 #include "yaffs_mtdif2.h"
 
@@ -27,6 +24,8 @@ const char *yaffs_mtdif2_c_version =
 
 #include "yaffs_packedtags2.h"
 
+#include "yaffs_linux.h"
+
 /* NB For use with inband tags....
  * We assume that the data buffer is of size totalBytersPerChunk so that we can also
  * use it to load the tags.
@@ -35,7 +34,7 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
                                      const __u8 *data,
                                      const yaffs_ExtendedTags *tags)
 {
-       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
        struct mtd_oob_ops ops;
 #else
@@ -47,13 +46,16 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
 
        yaffs_PackedTags2 pt;
 
+       int packed_tags_size = dev->param.noTagsECC ? sizeof(pt.t) : sizeof(pt);
+       void * packed_tags_ptr = dev->param.noTagsECC ? (void *) &pt.t : (void *)&pt;
+
        T(YAFFS_TRACE_MTD,
          (TSTR
           ("nandmtd2_WriteChunkWithTagsToNAND chunk %d data %p tags %p"
            TENDSTR), chunkInNAND, data, tags));
 
 
-       addr  = ((loff_t) chunkInNAND) * dev->totalBytesPerChunk;
+       addr  = ((loff_t) chunkInNAND) * dev->param.totalBytesPerChunk;
 
        /* For yaffs2 writing there must be both data and tags.
         * If we're using inband tags, then the tags are stuffed into
@@ -61,30 +63,30 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
         */
        if (!data || !tags)
                BUG();
-       else if (dev->inbandTags) {
+       else if (dev->param.inbandTags) {
                yaffs_PackedTags2TagsPart *pt2tp;
                pt2tp = (yaffs_PackedTags2TagsPart *)(data + dev->nDataBytesPerChunk);
                yaffs_PackTags2TagsPart(pt2tp, tags);
        } else
-               yaffs_PackTags2(&pt, tags);
+               yaffs_PackTags2(&pt, tags, !dev->param.noTagsECC);
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
        ops.mode = MTD_OOB_AUTO;
-       ops.ooblen = (dev->inbandTags) ? 0 : sizeof(pt);
-       ops.len = dev->totalBytesPerChunk;
+       ops.ooblen = (dev->param.inbandTags) ? 0 : packed_tags_size;
+       ops.len = dev->param.totalBytesPerChunk;
        ops.ooboffs = 0;
        ops.datbuf = (__u8 *)data;
-       ops.oobbuf = (dev->inbandTags) ? NULL : (void *)&pt;
+       ops.oobbuf = (dev->param.inbandTags) ? NULL : packed_tags_ptr;
        retval = mtd->write_oob(mtd, addr, &ops);
 
 #else
-       if (!dev->inbandTags) {
+       if (!dev->param.inbandTags) {
                retval =
                    mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-                                  &dummy, data, (__u8 *) &pt, NULL);
+                                  &dummy, data, (__u8 *) packed_tags_ptr, NULL);
        } else {
                retval =
-                   mtd->write(mtd, addr, dev->totalBytesPerChunk, &dummy,
+                   mtd->write(mtd, addr, dev->param.totalBytesPerChunk, &dummy,
                               data);
        }
 #endif
@@ -98,7 +100,7 @@ int nandmtd2_WriteChunkWithTagsToNAND(ya
 int nandmtd2_ReadChunkWithTagsFromNAND(yaffs_Device *dev, int chunkInNAND,
                                       __u8 *data, yaffs_ExtendedTags *tags)
 {
-       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
 #if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
        struct mtd_oob_ops ops;
 #endif
@@ -106,16 +108,19 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
        int retval = 0;
        int localData = 0;
 
-       loff_t addr = ((loff_t) chunkInNAND) * dev->totalBytesPerChunk;
+       loff_t addr = ((loff_t) chunkInNAND) * dev->param.totalBytesPerChunk;
 
        yaffs_PackedTags2 pt;
 
+       int packed_tags_size = dev->param.noTagsECC ? sizeof(pt.t) : sizeof(pt);
+       void * packed_tags_ptr = dev->param.noTagsECC ? (void *) &pt.t: (void *)&pt;
+
        T(YAFFS_TRACE_MTD,
          (TSTR
           ("nandmtd2_ReadChunkWithTagsFromNAND chunk %d data %p tags %p"
            TENDSTR), chunkInNAND, data, tags));
 
-       if (dev->inbandTags) {
+       if (dev->param.inbandTags) {
 
                if (!data) {
                        localData = 1;
@@ -127,20 +132,20 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
-       if (dev->inbandTags || (data && !tags))
-               retval = mtd->read(mtd, addr, dev->totalBytesPerChunk,
+       if (dev->param.inbandTags || (data && !tags))
+               retval = mtd->read(mtd, addr, dev->param.totalBytesPerChunk,
                                &dummy, data);
        else if (tags) {
                ops.mode = MTD_OOB_AUTO;
-               ops.ooblen = sizeof(pt);
-               ops.len = data ? dev->nDataBytesPerChunk : sizeof(pt);
+               ops.ooblen = packed_tags_size;
+               ops.len = data ? dev->nDataBytesPerChunk : packed_tags_size;
                ops.ooboffs = 0;
                ops.datbuf = data;
-               ops.oobbuf = dev->spareBuffer;
+               ops.oobbuf = yaffs_DeviceToLC(dev)->spareBuffer;
                retval = mtd->read_oob(mtd, addr, &ops);
        }
 #else
-       if (!dev->inbandTags && data && tags) {
+       if (!dev->param.inbandTags && data && tags) {
 
                retval = mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
                                          &dummy, data, dev->spareBuffer,
@@ -150,7 +155,7 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
                        retval =
                            mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
                                      data);
-               if (!dev->inbandTags && tags)
+               if (!dev->param.inbandTags && tags)
                        retval =
                            mtd->read_oob(mtd, addr, mtd->oobsize, &dummy,
                                          dev->spareBuffer);
@@ -158,7 +163,7 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 #endif
 
 
-       if (dev->inbandTags) {
+       if (dev->param.inbandTags) {
                if (tags) {
                        yaffs_PackedTags2TagsPart *pt2tp;
                        pt2tp = (yaffs_PackedTags2TagsPart *)&data[dev->nDataBytesPerChunk];
@@ -166,16 +171,22 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
                }
        } else {
                if (tags) {
-                       memcpy(&pt, dev->spareBuffer, sizeof(pt));
-                       yaffs_UnpackTags2(tags, &pt);
+                       memcpy(packed_tags_ptr, yaffs_DeviceToLC(dev)->spareBuffer, packed_tags_size);
+                       yaffs_UnpackTags2(tags, &pt, !dev->param.noTagsECC);
                }
        }
 
        if (localData)
                yaffs_ReleaseTempBuffer(dev, data, __LINE__);
 
-       if (tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR)
+       if (tags && retval == -EBADMSG && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR) {
                tags->eccResult = YAFFS_ECC_RESULT_UNFIXED;
+               dev->eccUnfixed++;
+       }
+       if(tags && retval == -EUCLEAN && tags->eccResult == YAFFS_ECC_RESULT_NO_ERROR) {
+               tags->eccResult = YAFFS_ECC_RESULT_FIXED;
+               dev->eccFixed++;
+       }
        if (retval == 0)
                return YAFFS_OK;
        else
@@ -184,15 +195,15 @@ int nandmtd2_ReadChunkWithTagsFromNAND(y
 
 int nandmtd2_MarkNANDBlockBad(struct yaffs_DeviceStruct *dev, int blockNo)
 {
-       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
        int retval;
        T(YAFFS_TRACE_MTD,
          (TSTR("nandmtd2_MarkNANDBlockBad %d" TENDSTR), blockNo));
 
        retval =
            mtd->block_markbad(mtd,
-                              blockNo * dev->nChunksPerBlock *
-                              dev->totalBytesPerChunk);
+                              blockNo * dev->param.nChunksPerBlock *
+                              dev->param.totalBytesPerChunk);
 
        if (retval == 0)
                return YAFFS_OK;
@@ -204,15 +215,15 @@ int nandmtd2_MarkNANDBlockBad(struct yaf
 int nandmtd2_QueryNANDBlock(struct yaffs_DeviceStruct *dev, int blockNo,
                            yaffs_BlockState *state, __u32 *sequenceNumber)
 {
-       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
        int retval;
 
        T(YAFFS_TRACE_MTD,
          (TSTR("nandmtd2_QueryNANDBlock %d" TENDSTR), blockNo));
        retval =
            mtd->block_isbad(mtd,
-                            blockNo * dev->nChunksPerBlock *
-                            dev->totalBytesPerChunk);
+                            blockNo * dev->param.nChunksPerBlock *
+                            dev->param.totalBytesPerChunk);
 
        if (retval) {
                T(YAFFS_TRACE_MTD, (TSTR("block is bad" TENDSTR)));
@@ -223,7 +234,7 @@ int nandmtd2_QueryNANDBlock(struct yaffs
                yaffs_ExtendedTags t;
                nandmtd2_ReadChunkWithTagsFromNAND(dev,
                                                   blockNo *
-                                                  dev->nChunksPerBlock, NULL,
+                                                  dev->param.nChunksPerBlock, NULL,
                                                   &t);
 
                if (t.chunkUsed) {
--- a/fs/yaffs2/yaffs_mtdif2.h
+++ b/fs/yaffs2/yaffs_mtdif2.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_mtdif.c
+++ b/fs/yaffs2/yaffs_mtdif.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,9 +11,6 @@
  * published by the Free Software Foundation.
  */
 
-const char *yaffs_mtdif_c_version =
-       "$Id: yaffs_mtdif.c,v 1.22 2009-03-06 17:20:51 wookey Exp $";
-
 #include "yportenv.h"
 
 
@@ -24,208 +21,26 @@ const char *yaffs_mtdif_c_version =
 #include "linux/time.h"
 #include "linux/mtd/nand.h"
 
-#if (MTD_VERSION_CODE < MTD_VERSION(2, 6, 18))
-static struct nand_oobinfo yaffs_oobinfo = {
-       .useecc = 1,
-       .eccbytes = 6,
-       .eccpos = {8, 9, 10, 13, 14, 15}
-};
-
-static struct nand_oobinfo yaffs_noeccinfo = {
-       .useecc = 0,
-};
-#endif
-
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-static inline void translate_spare2oob(const yaffs_Spare *spare, __u8 *oob)
-{
-       oob[0] = spare->tagByte0;
-       oob[1] = spare->tagByte1;
-       oob[2] = spare->tagByte2;
-       oob[3] = spare->tagByte3;
-       oob[4] = spare->tagByte4;
-       oob[5] = spare->tagByte5 & 0x3f;
-       oob[5] |= spare->blockStatus == 'Y' ? 0 : 0x80;
-       oob[5] |= spare->pageStatus == 0 ? 0 : 0x40;
-       oob[6] = spare->tagByte6;
-       oob[7] = spare->tagByte7;
-}
-
-static inline void translate_oob2spare(yaffs_Spare *spare, __u8 *oob)
-{
-       struct yaffs_NANDSpare *nspare = (struct yaffs_NANDSpare *)spare;
-       spare->tagByte0 = oob[0];
-       spare->tagByte1 = oob[1];
-       spare->tagByte2 = oob[2];
-       spare->tagByte3 = oob[3];
-       spare->tagByte4 = oob[4];
-       spare->tagByte5 = oob[5] == 0xff ? 0xff : oob[5] & 0x3f;
-       spare->blockStatus = oob[5] & 0x80 ? 0xff : 'Y';
-       spare->pageStatus = oob[5] & 0x40 ? 0xff : 0;
-       spare->ecc1[0] = spare->ecc1[1] = spare->ecc1[2] = 0xff;
-       spare->tagByte6 = oob[6];
-       spare->tagByte7 = oob[7];
-       spare->ecc2[0] = spare->ecc2[1] = spare->ecc2[2] = 0xff;
-
-       nspare->eccres1 = nspare->eccres2 = 0; /* FIXME */
-}
-#endif
-
-int nandmtd_WriteChunkToNAND(yaffs_Device *dev, int chunkInNAND,
-                            const __u8 *data, const yaffs_Spare *spare)
-{
-       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-       struct mtd_oob_ops ops;
-#endif
-       size_t dummy;
-       int retval = 0;
-
-       loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-       __u8 spareAsBytes[8]; /* OOB */
-
-       if (data && !spare)
-               retval = mtd->write(mtd, addr, dev->nDataBytesPerChunk,
-                               &dummy, data);
-       else if (spare) {
-               if (dev->useNANDECC) {
-                       translate_spare2oob(spare, spareAsBytes);
-                       ops.mode = MTD_OOB_AUTO;
-                       ops.ooblen = 8; /* temp hack */
-               } else {
-                       ops.mode = MTD_OOB_RAW;
-                       ops.ooblen = YAFFS_BYTES_PER_SPARE;
-               }
-               ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
-               ops.datbuf = (u8 *)data;
-               ops.ooboffs = 0;
-               ops.oobbuf = spareAsBytes;
-               retval = mtd->write_oob(mtd, addr, &ops);
-       }
-#else
-       __u8 *spareAsBytes = (__u8 *) spare;
-
-       if (data && spare) {
-               if (dev->useNANDECC)
-                       retval =
-                           mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-                                          &dummy, data, spareAsBytes,
-                                          &yaffs_oobinfo);
-               else
-                       retval =
-                           mtd->write_ecc(mtd, addr, dev->nDataBytesPerChunk,
-                                          &dummy, data, spareAsBytes,
-                                          &yaffs_noeccinfo);
-       } else {
-               if (data)
-                       retval =
-                           mtd->write(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-                                      data);
-               if (spare)
-                       retval =
-                           mtd->write_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
-                                          &dummy, spareAsBytes);
-       }
-#endif
-
-       if (retval == 0)
-               return YAFFS_OK;
-       else
-               return YAFFS_FAIL;
-}
-
-int nandmtd_ReadChunkFromNAND(yaffs_Device *dev, int chunkInNAND, __u8 *data,
-                             yaffs_Spare *spare)
-{
-       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-       struct mtd_oob_ops ops;
-#endif
-       size_t dummy;
-       int retval = 0;
-
-       loff_t addr = ((loff_t) chunkInNAND) * dev->nDataBytesPerChunk;
-#if (MTD_VERSION_CODE > MTD_VERSION(2, 6, 17))
-       __u8 spareAsBytes[8]; /* OOB */
-
-       if (data && !spare)
-               retval = mtd->read(mtd, addr, dev->nDataBytesPerChunk,
-                               &dummy, data);
-       else if (spare) {
-               if (dev->useNANDECC) {
-                       ops.mode = MTD_OOB_AUTO;
-                       ops.ooblen = 8; /* temp hack */
-               } else {
-                       ops.mode = MTD_OOB_RAW;
-                       ops.ooblen = YAFFS_BYTES_PER_SPARE;
-               }
-               ops.len = data ? dev->nDataBytesPerChunk : ops.ooblen;
-               ops.datbuf = data;
-               ops.ooboffs = 0;
-               ops.oobbuf = spareAsBytes;
-               retval = mtd->read_oob(mtd, addr, &ops);
-               if (dev->useNANDECC)
-                       translate_oob2spare(spare, spareAsBytes);
-       }
-#else
-       __u8 *spareAsBytes = (__u8 *) spare;
-
-       if (data && spare) {
-               if (dev->useNANDECC) {
-                       /* Careful, this call adds 2 ints */
-                       /* to the end of the spare data.  Calling function */
-                       /* should allocate enough memory for spare, */
-                       /* i.e. [YAFFS_BYTES_PER_SPARE+2*sizeof(int)]. */
-                       retval =
-                           mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-                                         &dummy, data, spareAsBytes,
-                                         &yaffs_oobinfo);
-               } else {
-                       retval =
-                           mtd->read_ecc(mtd, addr, dev->nDataBytesPerChunk,
-                                         &dummy, data, spareAsBytes,
-                                         &yaffs_noeccinfo);
-               }
-       } else {
-               if (data)
-                       retval =
-                           mtd->read(mtd, addr, dev->nDataBytesPerChunk, &dummy,
-                                     data);
-               if (spare)
-                       retval =
-                           mtd->read_oob(mtd, addr, YAFFS_BYTES_PER_SPARE,
-                                         &dummy, spareAsBytes);
-       }
-#endif
-
-       if (retval == 0)
-               return YAFFS_OK;
-       else
-               return YAFFS_FAIL;
-}
+#include "yaffs_linux.h"
 
 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber)
 {
-       struct mtd_info *mtd = (struct mtd_info *)(dev->genericDevice);
+       struct mtd_info *mtd = yaffs_DeviceToMtd(dev);
        __u32 addr =
-           ((loff_t) blockNumber) * dev->nDataBytesPerChunk
-               * dev->nChunksPerBlock;
+           ((loff_t) blockNumber) * dev->param.totalBytesPerChunk
+               * dev->param.nChunksPerBlock;
        struct erase_info ei;
+       
        int retval = 0;
 
        ei.mtd = mtd;
        ei.addr = addr;
-       ei.len = dev->nDataBytesPerChunk * dev->nChunksPerBlock;
+       ei.len = dev->param.totalBytesPerChunk * dev->param.nChunksPerBlock;
        ei.time = 1000;
        ei.retries = 2;
        ei.callback = NULL;
        ei.priv = (u_long) dev;
 
-       /* Todo finish off the ei if required */
-
-       sema_init(&dev->sem, 0);
-
        retval = mtd->erase(mtd, &ei);
 
        if (retval == 0)
--- a/fs/yaffs2/yaffs_mtdif.h
+++ b/fs/yaffs2/yaffs_mtdif.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -22,11 +22,6 @@
 extern struct nand_oobinfo yaffs_oobinfo;
 extern struct nand_oobinfo yaffs_noeccinfo;
 #endif
-
-int nandmtd_WriteChunkToNAND(yaffs_Device *dev, int chunkInNAND,
-                       const __u8 *data, const yaffs_Spare *spare);
-int nandmtd_ReadChunkFromNAND(yaffs_Device *dev, int chunkInNAND, __u8 *data,
-                       yaffs_Spare *spare);
 int nandmtd_EraseBlockInNAND(yaffs_Device *dev, int blockNumber);
 int nandmtd_InitialiseNAND(yaffs_Device *dev);
 #endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.c
@@ -0,0 +1,197 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ * This simple implementation of a name-value store assumes a small number of values and fits
+ * into a small finite buffer.
+ *
+ * Each attribute is stored as a record:
+ *  sizeof(int) bytes   record size.
+ *  strnlen+1 bytes name null terminated.
+ *  nbytes    value.
+ *  ----------
+ *  total size  stored in record size 
+ *
+ * This code has not been tested with unicode yet.
+ */
+
+
+#include "yaffs_nameval.h"
+
+#include "yportenv.h"
+ 
+static int nval_find(const char *xb, int xb_size, const YCHAR *name,
+               int *exist_size)
+{
+       int pos=0;
+       int size;
+
+       memcpy(&size,xb,sizeof(int));
+       while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
+               if(yaffs_strncmp((YCHAR *)(xb+pos+sizeof(int)),name,size) == 0){
+                       if(exist_size)
+                               *exist_size = size;
+                       return pos;
+               }
+               pos += size;
+               if(pos < xb_size -sizeof(int))
+                       memcpy(&size,xb + pos,sizeof(int));
+               else
+                       size = 0;
+       }
+       if(exist_size)
+               *exist_size = 0;
+       return -1;
+}
+
+static int nval_used(const char *xb, int xb_size)
+{
+       int pos=0;
+       int size;
+
+       memcpy(&size,xb + pos,sizeof(int));
+       while(size > 0 && (size < xb_size) && (pos + size < xb_size)){
+               pos += size;
+               if(pos < xb_size -sizeof(int))
+                       memcpy(&size,xb + pos,sizeof(int));
+               else
+                       size = 0;
+       }
+       return pos;
+}
+
+int nval_del(char *xb, int xb_size, const YCHAR *name)
+{
+       int pos  = nval_find(xb, xb_size, name, NULL);
+       int size;
+       
+       if(pos >= 0 && pos < xb_size){
+               /* Find size, shift rest over this record, then zero out the rest of buffer */
+               memcpy(&size,xb+pos,sizeof(int));
+               memcpy(xb + pos, xb + pos + size, xb_size - (pos + size));
+               memset(xb + (xb_size - size),0,size);
+               return 0;
+       } else
+               return -ENODATA;
+}
+
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags)
+{
+       int pos;
+       int namelen = yaffs_strnlen(name,xb_size);
+       int reclen;
+       int size_exist = 0;
+       int space;
+       int start;
+
+       pos = nval_find(xb,xb_size,name, &size_exist);
+
+       if(flags & XATTR_CREATE && pos >= 0)
+               return -EEXIST;
+       if(flags & XATTR_REPLACE && pos < 0)
+               return -ENODATA;
+
+       start = nval_used(xb,xb_size);
+       space = xb_size - start + size_exist;
+
+       reclen = (sizeof(int) + namelen + 1 + bsize);
+
+       if(reclen > space)
+               return -ENOSPC;
+
+       if(pos >= 0){
+               nval_del(xb,xb_size,name);
+               start = nval_used(xb, xb_size);
+       }
+
+       pos = start;
+
+       memcpy(xb + pos,&reclen,sizeof(int));
+       pos +=sizeof(int);
+       yaffs_strncpy((YCHAR *)(xb + pos), name, reclen);
+       pos+= (namelen+1);
+       memcpy(xb + pos,buf,bsize);
+       return 0;
+}
+
+int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize)
+{
+       int pos = nval_find(xb,xb_size,name,NULL);
+       int size;
+       
+       if(pos >= 0 && pos< xb_size){
+               
+               memcpy(&size,xb +pos,sizeof(int));
+               pos+=sizeof(int); /* advance past record length */
+               size -= sizeof(int);
+
+               /* Advance over name string */
+               while(xb[pos] && size > 0 && pos < xb_size){
+                       pos++;
+                       size--;
+               }
+               /*Advance over NUL */
+               pos++;
+               size--;
+
+               if(size <= bsize){
+                       memcpy(buf,xb + pos,size);
+                       return size;
+               }
+               
+       }
+       if(pos >= 0)
+               return -ERANGE;
+       else
+               return -ENODATA;
+}
+
+int nval_list(const char *xb, int xb_size, char *buf, int bsize)
+{
+       int pos = 0;
+       int size;
+       int name_len;
+       int ncopied = 0;
+       int filled = 0;
+
+       memcpy(&size,xb + pos,sizeof(int));
+       while(size > sizeof(int) && size <= xb_size && (pos + size) < xb_size && !filled){
+               pos+= sizeof(int);
+               size-=sizeof(int);
+               name_len = yaffs_strnlen((YCHAR *)(xb + pos), size);
+               if(ncopied + name_len + 1 < bsize){
+                       memcpy(buf,xb+pos,name_len * sizeof(YCHAR));
+                       buf+= name_len;
+                       *buf = '\0';
+                       buf++;
+                       if(sizeof(YCHAR) > 1){
+                               *buf = '\0';
+                               buf++;
+                       }
+                       ncopied += (name_len+1);
+               } else
+                       filled = 1;
+               pos+=size;
+               if(pos < xb_size -sizeof(int))
+                       memcpy(&size,xb + pos,sizeof(int));
+               else
+                       size = 0;
+       }
+       return ncopied;
+}
+
+
+int nval_hasvalues(const char *xb, int xb_size)
+{
+       return nval_used(xb, xb_size) > 0;
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_nameval.h
@@ -0,0 +1,25 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+#ifndef __NAMEVAL_H__
+#define __NAMEVAL_H__
+
+#include "yportenv.h"
+
+int nval_del(char *xb, int xb_size, const YCHAR *name);
+int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf, int bsize, int flags);
+int nval_get(const char *xb, int xb_size, const YCHAR *name, char *buf, int bsize);
+int nval_list(const char *xb, int xb_size, char *buf, int bsize);
+int nval_hasvalues(const char *xb, int xb_size);
+#endif
--- a/fs/yaffs2/yaffs_nand.c
+++ b/fs/yaffs2/yaffs_nand.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -11,9 +11,6 @@
  * published by the Free Software Foundation.
  */
 
-const char *yaffs_nand_c_version =
-       "$Id: yaffs_nand.c,v 1.10 2009-03-06 17:20:54 wookey Exp $";
-
 #include "yaffs_nand.h"
 #include "yaffs_tagscompat.h"
 #include "yaffs_tagsvalidity.h"
@@ -29,12 +26,14 @@ int yaffs_ReadChunkWithTagsFromNAND(yaff
 
        int realignedChunkInNAND = chunkInNAND - dev->chunkOffset;
 
+       dev->nPageReads++;
+
        /* If there are no tags provided, use local tags to get prioritised gc working */
        if (!tags)
                tags = &localTags;
 
-       if (dev->readChunkWithTagsFromNAND)
-               result = dev->readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
+       if (dev->param.readChunkWithTagsFromNAND)
+               result = dev->param.readChunkWithTagsFromNAND(dev, realignedChunkInNAND, buffer,
                                                      tags);
        else
                result = yaffs_TagsCompatabilityReadChunkWithTagsFromNAND(dev,
@@ -44,7 +43,8 @@ int yaffs_ReadChunkWithTagsFromNAND(yaff
        if (tags &&
           tags->eccResult > YAFFS_ECC_RESULT_NO_ERROR) {
 
-               yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->nChunksPerBlock);
+               yaffs_BlockInfo *bi;
+               bi = yaffs_GetBlockInfo(dev, chunkInNAND/dev->param.nChunksPerBlock);
                yaffs_HandleChunkError(dev, bi);
        }
 
@@ -56,6 +56,9 @@ int yaffs_WriteChunkWithTagsToNAND(yaffs
                                                   const __u8 *buffer,
                                                   yaffs_ExtendedTags *tags)
 {
+
+       dev->nPageWrites++;
+
        chunkInNAND -= dev->chunkOffset;
 
 
@@ -75,8 +78,8 @@ int yaffs_WriteChunkWithTagsToNAND(yaffs
                YBUG();
        }
 
-       if (dev->writeChunkWithTagsToNAND)
-               return dev->writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
+       if (dev->param.writeChunkWithTagsToNAND)
+               return dev->param.writeChunkWithTagsToNAND(dev, chunkInNAND, buffer,
                                                     tags);
        else
                return yaffs_TagsCompatabilityWriteChunkWithTagsToNAND(dev,
@@ -89,9 +92,9 @@ int yaffs_MarkBlockBad(yaffs_Device *dev
 {
        blockNo -= dev->blockOffset;
 
-;
-       if (dev->markNANDBlockBad)
-               return dev->markNANDBlockBad(dev, blockNo);
+
+       if (dev->param.markNANDBlockBad)
+               return dev->param.markNANDBlockBad(dev, blockNo);
        else
                return yaffs_TagsCompatabilityMarkNANDBlockBad(dev, blockNo);
 }
@@ -103,8 +106,8 @@ int yaffs_QueryInitialBlockState(yaffs_D
 {
        blockNo -= dev->blockOffset;
 
-       if (dev->queryNANDBlock)
-               return dev->queryNANDBlock(dev, blockNo, state, sequenceNumber);
+       if (dev->param.queryNANDBlock)
+               return dev->param.queryNANDBlock(dev, blockNo, state, sequenceNumber);
        else
                return yaffs_TagsCompatabilityQueryNANDBlock(dev, blockNo,
                                                             state,
@@ -119,16 +122,18 @@ int yaffs_EraseBlockInNAND(struct yaffs_
 
        blockInNAND -= dev->blockOffset;
 
-
        dev->nBlockErasures++;
-       result = dev->eraseBlockInNAND(dev, blockInNAND);
+
+       result = dev->param.eraseBlockInNAND(dev, blockInNAND);
 
        return result;
 }
 
 int yaffs_InitialiseNAND(struct yaffs_DeviceStruct *dev)
 {
-       return dev->initialiseNAND(dev);
+       if(dev->param.initialiseNAND)
+               return dev->param.initialiseNAND(dev);
+       return YAFFS_OK;
 }
 
 
--- a/fs/yaffs2/yaffs_nandemul2k.h
+++ b/fs/yaffs2/yaffs_nandemul2k.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_nand.h
+++ b/fs/yaffs2/yaffs_nand.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_packedtags1.c
+++ b/fs/yaffs2/yaffs_packedtags1.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_packedtags1.h
+++ b/fs/yaffs2/yaffs_packedtags1.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_packedtags2.c
+++ b/fs/yaffs2/yaffs_packedtags2.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -13,6 +13,7 @@
 
 #include "yaffs_packedtags2.h"
 #include "yportenv.h"
+#include "yaffs_trace.h"
 #include "yaffs_tagsvalidity.h"
 
 /* This code packs a set of extended tags into a binary structure for
@@ -96,17 +97,14 @@ void yaffs_PackTags2TagsPart(yaffs_Packe
 }
 
 
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t)
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t, int tagsECC)
 {
        yaffs_PackTags2TagsPart(&pt->t, t);
 
-#ifndef YAFFS_IGNORE_TAGS_ECC
-       {
+       if(tagsECC)
                yaffs_ECCCalculateOther((unsigned char *)&pt->t,
                                        sizeof(yaffs_PackedTags2TagsPart),
                                        &pt->ecc);
-       }
-#endif
 }
 
 
@@ -158,27 +156,24 @@ void yaffs_UnpackTags2TagsPart(yaffs_Ext
 }
 
 
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt)
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt, int tagsECC)
 {
 
        yaffs_ECCResult eccResult = YAFFS_ECC_RESULT_NO_ERROR;
 
-       if (pt->t.sequenceNumber != 0xFFFFFFFF) {
-               /* Page is in use */
-#ifndef YAFFS_IGNORE_TAGS_ECC
-               {
-                       yaffs_ECCOther ecc;
-                       int result;
-                       yaffs_ECCCalculateOther((unsigned char *)&pt->t,
-                                               sizeof
-                                               (yaffs_PackedTags2TagsPart),
-                                               &ecc);
-                       result =
-                           yaffs_ECCCorrectOther((unsigned char *)&pt->t,
-                                                 sizeof
-                                                 (yaffs_PackedTags2TagsPart),
-                                                 &pt->ecc, &ecc);
-                       switch (result) {
+       if (pt->t.sequenceNumber != 0xFFFFFFFF &&
+           tagsECC){
+               /* Chunk is in use and we need to do ECC */
+               
+               yaffs_ECCOther ecc;
+               int result;
+               yaffs_ECCCalculateOther((unsigned char *)&pt->t,
+                                       sizeof(yaffs_PackedTags2TagsPart),
+                                       &ecc);
+               result = yaffs_ECCCorrectOther((unsigned char *)&pt->t,
+                                               sizeof(yaffs_PackedTags2TagsPart),
+                                               &pt->ecc, &ecc);
+               switch (result) {
                        case 0:
                                eccResult = YAFFS_ECC_RESULT_NO_ERROR;
                                break;
@@ -190,9 +185,7 @@ void yaffs_UnpackTags2(yaffs_ExtendedTag
                                break;
                        default:
                                eccResult = YAFFS_ECC_RESULT_UNKNOWN;
-                       }
                }
-#endif
        }
 
        yaffs_UnpackTags2TagsPart(t, &pt->t);
@@ -201,6 +194,5 @@ void yaffs_UnpackTags2(yaffs_ExtendedTag
 
        yaffs_DumpPackedTags2(pt);
        yaffs_DumpTags2(t);
-
 }
 
--- a/fs/yaffs2/yaffs_packedtags2.h
+++ b/fs/yaffs2/yaffs_packedtags2.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -34,8 +34,8 @@ typedef struct {
 } yaffs_PackedTags2;
 
 /* Full packed tags with ECC, used for oob tags */
-void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t);
-void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt);
+void yaffs_PackTags2(yaffs_PackedTags2 *pt, const yaffs_ExtendedTags *t, int tagsECC);
+void yaffs_UnpackTags2(yaffs_ExtendedTags *t, yaffs_PackedTags2 *pt, int tagsECC);
 
 /* Only the tags part (no ECC for use with inband tags */
 void yaffs_PackTags2TagsPart(yaffs_PackedTags2TagsPart *pt, const yaffs_ExtendedTags *t);
--- a/fs/yaffs2/yaffs_qsort.h
+++ b/fs/yaffs2/yaffs_qsort.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -17,7 +17,18 @@
 #ifndef __YAFFS_QSORT_H__
 #define __YAFFS_QSORT_H__
 
+#ifdef __KERNEL__
+#include <linux/sort.h>
+
+extern void yaffs_qsort(void *const base, size_t total_elems, size_t size,
+                       int (*cmp)(const void *, const void *)){
+       sort(base, total_elems, size, cmp, NULL);
+}
+
+#else
+
 extern void yaffs_qsort(void *const base, size_t total_elems, size_t size,
                        int (*cmp)(const void *, const void *));
 
 #endif
+#endif
--- a/fs/yaffs2/yaffs_tagscompat.c
+++ b/fs/yaffs2/yaffs_tagscompat.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -15,6 +15,7 @@
 #include "yaffs_tagscompat.h"
 #include "yaffs_ecc.h"
 #include "yaffs_getblockinfo.h"
+#include "yaffs_trace.h"
 
 static void yaffs_HandleReadDataError(yaffs_Device *dev, int chunkInNAND);
 #ifdef NOTYET
@@ -163,15 +164,14 @@ static int yaffs_WriteChunkToNAND(struct
                                int chunkInNAND, const __u8 *data,
                                yaffs_Spare *spare)
 {
-       if (chunkInNAND < dev->startBlock * dev->nChunksPerBlock) {
+       if (chunkInNAND < dev->param.startBlock * dev->param.nChunksPerBlock) {
                T(YAFFS_TRACE_ERROR,
                  (TSTR("**>> yaffs chunk %d is not valid" TENDSTR),
                   chunkInNAND));
                return YAFFS_FAIL;
        }
 
-       dev->nPageWrites++;
-       return dev->writeChunkToNAND(dev, chunkInNAND, data, spare);
+       return dev->param.writeChunkToNAND(dev, chunkInNAND, data, spare);
 }
 
 static int yaffs_ReadChunkFromNAND(struct yaffs_DeviceStruct *dev,
@@ -184,16 +184,14 @@ static int yaffs_ReadChunkFromNAND(struc
        int retVal;
        yaffs_Spare localSpare;
 
-       dev->nPageReads++;
-
        if (!spare && data) {
                /* If we don't have a real spare, then we use a local one. */
                /* Need this for the calculation of the ecc */
                spare = &localSpare;
        }
 
-       if (!dev->useNANDECC) {
-               retVal = dev->readChunkFromNAND(dev, chunkInNAND, data, spare);
+       if (!dev->param.useNANDECC) {
+               retVal = dev->param.readChunkFromNAND(dev, chunkInNAND, data, spare);
                if (data && doErrorCorrection) {
                        /* Do ECC correction */
                        /* Todo handle any errors */
@@ -254,7 +252,7 @@ static int yaffs_ReadChunkFromNAND(struc
 
                memset(&nspare, 0, sizeof(nspare));
 
-               retVal = dev->readChunkFromNAND(dev, chunkInNAND, data,
+               retVal = dev->param.readChunkFromNAND(dev, chunkInNAND, data,
                                        (yaffs_Spare *) &nspare);
                memcpy(spare, &nspare, sizeof(yaffs_Spare));
                if (data && doErrorCorrection) {
@@ -307,10 +305,10 @@ static int yaffs_CheckChunkErased(struct
        static __u8 cmpbuf[YAFFS_BYTES_PER_CHUNK];
        static __u8 data[YAFFS_BYTES_PER_CHUNK];
        /* Might as well always allocate the larger size for */
-       /* dev->useNANDECC == true; */
+       /* dev->param.useNANDECC == true; */
        static __u8 spare[sizeof(struct yaffs_NANDSpare)];
 
-       dev->readChunkFromNAND(dev, chunkInNAND, data, (yaffs_Spare *) spare);
+       dev->param.readChunkFromNAND(dev, chunkInNAND, data, (yaffs_Spare *) spare);
 
        if (!init) {
                memset(cmpbuf, 0xff, YAFFS_BYTES_PER_CHUNK);
@@ -333,7 +331,7 @@ static int yaffs_CheckChunkErased(struct
 
 static void yaffs_HandleReadDataError(yaffs_Device *dev, int chunkInNAND)
 {
-       int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+       int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
 
        /* Mark the block for retirement */
        yaffs_GetBlockInfo(dev, blockInNAND + dev->blockOffset)->needsRetiring = 1;
@@ -365,7 +363,7 @@ static void yaffs_HandleUpdateChunk(yaff
 
 static void yaffs_HandleWriteChunkError(yaffs_Device *dev, int chunkInNAND)
 {
-       int blockInNAND = chunkInNAND / dev->nChunksPerBlock;
+       int blockInNAND = chunkInNAND / dev->param.nChunksPerBlock;
 
        /* Mark the block for retirement */
        yaffs_GetBlockInfo(dev, blockInNAND)->needsRetiring = 1;
@@ -424,7 +422,7 @@ int yaffs_TagsCompatabilityWriteChunkWit
 
                tags.serialNumber = eTags->serialNumber;
 
-               if (!dev->useNANDECC && data)
+               if (!dev->param.useNANDECC && data)
                        yaffs_CalcECC(data, &spare);
 
                yaffs_LoadTagsIntoSpare(&spare, &tags);
@@ -498,9 +496,9 @@ int yaffs_TagsCompatabilityMarkNANDBlock
 
        spare.blockStatus = 'Y';
 
-       yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock, NULL,
+       yaffs_WriteChunkToNAND(dev, blockInNAND * dev->param.nChunksPerBlock, NULL,
                               &spare);
-       yaffs_WriteChunkToNAND(dev, blockInNAND * dev->nChunksPerBlock + 1,
+       yaffs_WriteChunkToNAND(dev, blockInNAND * dev->param.nChunksPerBlock + 1,
                               NULL, &spare);
 
        return YAFFS_OK;
@@ -525,9 +523,9 @@ int yaffs_TagsCompatabilityQueryNANDBloc
 
        *sequenceNumber = 0;
 
-       yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock, NULL,
+       yaffs_ReadChunkFromNAND(dev, blockNo * dev->param.nChunksPerBlock, NULL,
                                &spare0, &dummy, 1);
-       yaffs_ReadChunkFromNAND(dev, blockNo * dev->nChunksPerBlock + 1, NULL,
+       yaffs_ReadChunkFromNAND(dev, blockNo * dev->param.nChunksPerBlock + 1, NULL,
                                &spare1, &dummy, 1);
 
        if (yaffs_CountBits(spare0.blockStatus & spare1.blockStatus) < 7)
--- a/fs/yaffs2/yaffs_tagscompat.h
+++ b/fs/yaffs2/yaffs_tagscompat.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_tagsvalidity.c
+++ b/fs/yaffs2/yaffs_tagsvalidity.c
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- a/fs/yaffs2/yaffs_tagsvalidity.h
+++ b/fs/yaffs2/yaffs_tagsvalidity.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
--- /dev/null
+++ b/fs/yaffs2/yaffs_trace.h
@@ -0,0 +1,60 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+
+#ifndef __YTRACE_H__
+#define __YTRACE_H__
+
+extern unsigned int yaffs_traceMask;
+extern unsigned int yaffs_wr_attempts;
+
+/*
+ * Tracing flags.
+ * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
+ */
+
+#define YAFFS_TRACE_OS                 0x00000002
+#define YAFFS_TRACE_ALLOCATE           0x00000004
+#define YAFFS_TRACE_SCAN               0x00000008
+#define YAFFS_TRACE_BAD_BLOCKS         0x00000010
+#define YAFFS_TRACE_ERASE              0x00000020
+#define YAFFS_TRACE_GC                 0x00000040
+#define YAFFS_TRACE_WRITE              0x00000080
+#define YAFFS_TRACE_TRACING            0x00000100
+#define YAFFS_TRACE_DELETION           0x00000200
+#define YAFFS_TRACE_BUFFERS            0x00000400
+#define YAFFS_TRACE_NANDACCESS         0x00000800
+#define YAFFS_TRACE_GC_DETAIL          0x00001000
+#define YAFFS_TRACE_SCAN_DEBUG         0x00002000
+#define YAFFS_TRACE_MTD                        0x00004000
+#define YAFFS_TRACE_CHECKPOINT         0x00008000
+
+#define YAFFS_TRACE_VERIFY             0x00010000
+#define YAFFS_TRACE_VERIFY_NAND                0x00020000
+#define YAFFS_TRACE_VERIFY_FULL                0x00040000
+#define YAFFS_TRACE_VERIFY_ALL         0x000F0000
+
+#define YAFFS_TRACE_SYNC               0x00100000
+#define YAFFS_TRACE_BACKGROUND         0x00200000
+#define YAFFS_TRACE_LOCK               0x00400000
+
+#define YAFFS_TRACE_ERROR              0x40000000
+#define YAFFS_TRACE_BUG                        0x80000000
+#define YAFFS_TRACE_ALWAYS             0xF0000000
+
+
+#define T(mask, p) do { if ((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p); } while (0)
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.c
@@ -0,0 +1,626 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include "yaffs_verify.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+int yaffs_SkipVerification(yaffs_Device *dev)
+{
+       dev=dev;
+       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipFullVerification(yaffs_Device *dev)
+{
+       dev=dev;
+       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_FULL));
+}
+
+static int yaffs_SkipNANDVerification(yaffs_Device *dev)
+{
+       dev=dev;
+       return !(yaffs_traceMask & (YAFFS_TRACE_VERIFY_NAND));
+}
+
+
+static const char *blockStateName[] = {
+"Unknown",
+"Needs scanning",
+"Scanning",
+"Empty",
+"Allocating",
+"Full",
+"Dirty",
+"Checkpoint",
+"Collecting",
+"Dead"
+};
+
+
+void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
+{
+       int actuallyUsed;
+       int inUse;
+
+       if (yaffs_SkipVerification(dev))
+               return;
+
+       /* Report illegal runtime states */
+       if (bi->blockState >= YAFFS_NUMBER_OF_BLOCK_STATES)
+               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has undefined state %d"TENDSTR), n, bi->blockState));
+
+       switch (bi->blockState) {
+       case YAFFS_BLOCK_STATE_UNKNOWN:
+       case YAFFS_BLOCK_STATE_SCANNING:
+       case YAFFS_BLOCK_STATE_NEEDS_SCANNING:
+               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has bad run-state %s"TENDSTR),
+               n, blockStateName[bi->blockState]));
+       }
+
+       /* Check pages in use and soft deletions are legal */
+
+       actuallyUsed = bi->pagesInUse - bi->softDeletions;
+
+       if (bi->pagesInUse < 0 || bi->pagesInUse > dev->param.nChunksPerBlock ||
+          bi->softDeletions < 0 || bi->softDeletions > dev->param.nChunksPerBlock ||
+          actuallyUsed < 0 || actuallyUsed > dev->param.nChunksPerBlock)
+               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has illegal values pagesInUsed %d softDeletions %d"TENDSTR),
+               n, bi->pagesInUse, bi->softDeletions));
+
+
+       /* Check chunk bitmap legal */
+       inUse = yaffs_CountChunkBits(dev, n);
+       if (inUse != bi->pagesInUse)
+               T(YAFFS_TRACE_VERIFY, (TSTR("Block %d has inconsistent values pagesInUse %d counted chunk bits %d"TENDSTR),
+                       n, bi->pagesInUse, inUse));
+
+}
+
+
+
+void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n)
+{
+       yaffs_VerifyBlock(dev, bi, n);
+
+       /* After collection the block should be in the erased state */
+
+       if (bi->blockState != YAFFS_BLOCK_STATE_COLLECTING &&
+                       bi->blockState != YAFFS_BLOCK_STATE_EMPTY) {
+               T(YAFFS_TRACE_ERROR, (TSTR("Block %d is in state %d after gc, should be erased"TENDSTR),
+                       n, bi->blockState));
+       }
+}
+
+void yaffs_VerifyBlocks(yaffs_Device *dev)
+{
+       int i;
+       int nBlocksPerState[YAFFS_NUMBER_OF_BLOCK_STATES];
+       int nIllegalBlockStates = 0;
+
+       if (yaffs_SkipVerification(dev))
+               return;
+
+       memset(nBlocksPerState, 0, sizeof(nBlocksPerState));
+
+       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+               yaffs_BlockInfo *bi = yaffs_GetBlockInfo(dev, i);
+               yaffs_VerifyBlock(dev, bi, i);
+
+               if (bi->blockState < YAFFS_NUMBER_OF_BLOCK_STATES)
+                       nBlocksPerState[bi->blockState]++;
+               else
+                       nIllegalBlockStates++;
+       }
+
+       T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
+       T(YAFFS_TRACE_VERIFY, (TSTR("Block summary"TENDSTR)));
+
+       T(YAFFS_TRACE_VERIFY, (TSTR("%d blocks have illegal states"TENDSTR), nIllegalBlockStates));
+       if (nBlocksPerState[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
+               T(YAFFS_TRACE_VERIFY, (TSTR("Too many allocating blocks"TENDSTR)));
+
+       for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
+               T(YAFFS_TRACE_VERIFY,
+                 (TSTR("%s %d blocks"TENDSTR),
+                 blockStateName[i], nBlocksPerState[i]));
+
+       if (dev->blocksInCheckpoint != nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT])
+               T(YAFFS_TRACE_VERIFY,
+                (TSTR("Checkpoint block count wrong dev %d count %d"TENDSTR),
+                dev->blocksInCheckpoint, nBlocksPerState[YAFFS_BLOCK_STATE_CHECKPOINT]));
+
+       if (dev->nErasedBlocks != nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY])
+               T(YAFFS_TRACE_VERIFY,
+                (TSTR("Erased block count wrong dev %d count %d"TENDSTR),
+                dev->nErasedBlocks, nBlocksPerState[YAFFS_BLOCK_STATE_EMPTY]));
+
+       if (nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING] > 1)
+               T(YAFFS_TRACE_VERIFY,
+                (TSTR("Too many collecting blocks %d (max is 1)"TENDSTR),
+                nBlocksPerState[YAFFS_BLOCK_STATE_COLLECTING]));
+
+       T(YAFFS_TRACE_VERIFY, (TSTR(""TENDSTR)));
+
+}
+
+/*
+ * Verify the object header. oh must be valid, but obj and tags may be NULL in which
+ * case those tests will not be performed.
+ */
+void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck)
+{
+       if (obj && yaffs_SkipVerification(obj->myDev))
+               return;
+
+       if (!(tags && obj && oh)) {
+               T(YAFFS_TRACE_VERIFY,
+                               (TSTR("Verifying object header tags %p obj %p oh %p"TENDSTR),
+                               tags, obj, oh));
+               return;
+       }
+
+       if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
+                       oh->type > YAFFS_OBJECT_TYPE_MAX)
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d header type is illegal value 0x%x"TENDSTR),
+                       tags->objectId, oh->type));
+
+       if (tags->objectId != obj->objectId)
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d header mismatch objectId %d"TENDSTR),
+                       tags->objectId, obj->objectId));
+
+
+       /*
+        * Check that the object's parent ids match if parentCheck requested.
+        *
+        * Tests do not apply to the root object.
+        */
+
+       if (parentCheck && tags->objectId > 1 && !obj->parent)
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d header mismatch parentId %d obj->parent is NULL"TENDSTR),
+                       tags->objectId, oh->parentObjectId));
+
+       if (parentCheck && obj->parent &&
+                       oh->parentObjectId != obj->parent->objectId &&
+                       (oh->parentObjectId != YAFFS_OBJECTID_UNLINKED ||
+                       obj->parent->objectId != YAFFS_OBJECTID_DELETED))
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d header mismatch parentId %d parentObjectId %d"TENDSTR),
+                       tags->objectId, oh->parentObjectId, obj->parent->objectId));
+
+       if (tags->objectId > 1 && oh->name[0] == 0) /* Null name */
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d header name is NULL"TENDSTR),
+                       obj->objectId));
+
+       if (tags->objectId > 1 && ((__u8)(oh->name[0])) == 0xff) /* Trashed name */
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d header name is 0xFF"TENDSTR),
+                       obj->objectId));
+}
+
+
+#if 0
+/* Not being used, but don't want to throw away yet */
+int yaffs_VerifyTnodeWorker(yaffs_Object *obj, yaffs_Tnode *tn,
+                                       __u32 level, int chunkOffset)
+{
+       int i;
+       yaffs_Device *dev = obj->myDev;
+       int ok = 1;
+
+       if (tn) {
+               if (level > 0) {
+
+                       for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+                               if (tn->internal[i]) {
+                                       ok = yaffs_VerifyTnodeWorker(obj,
+                                                       tn->internal[i],
+                                                       level - 1,
+                                                       (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+                               }
+                       }
+               } else if (level == 0) {
+                       yaffs_ExtendedTags tags;
+                       __u32 objectId = obj->objectId;
+
+                       chunkOffset <<=  YAFFS_TNODES_LEVEL0_BITS;
+
+                       for (i = 0; i < YAFFS_NTNODES_LEVEL0; i++) {
+                               __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+
+                               if (theChunk > 0) {
+                                       /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),tags.objectId,tags.chunkId,theChunk)); */
+                                       yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
+                                       if (tags.objectId != objectId || tags.chunkId != chunkOffset) {
+                                               T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+                                                       objectId, chunkOffset, theChunk,
+                                                       tags.objectId, tags.chunkId));
+                                       }
+                               }
+                               chunkOffset++;
+                       }
+               }
+       }
+
+       return ok;
+
+}
+
+#endif
+
+void yaffs_VerifyFile(yaffs_Object *obj)
+{
+       int requiredTallness;
+       int actualTallness;
+       __u32 lastChunk;
+       __u32 x;
+       __u32 i;
+       yaffs_Device *dev;
+       yaffs_ExtendedTags tags;
+       yaffs_Tnode *tn;
+       __u32 objectId;
+
+       if (!obj)
+               return;
+
+       if (yaffs_SkipVerification(obj->myDev))
+               return;
+
+       dev = obj->myDev;
+       objectId = obj->objectId;
+
+       /* Check file size is consistent with tnode depth */
+       lastChunk =  obj->variant.fileVariant.fileSize / dev->nDataBytesPerChunk + 1;
+       x = lastChunk >> YAFFS_TNODES_LEVEL0_BITS;
+       requiredTallness = 0;
+       while (x > 0) {
+               x >>= YAFFS_TNODES_INTERNAL_BITS;
+               requiredTallness++;
+       }
+
+       actualTallness = obj->variant.fileVariant.topLevel;
+
+       /* Check that the chunks in the tnode tree are all correct.
+        * We do this by scanning through the tnode tree and
+        * checking the tags for every chunk match.
+        */
+
+       if (yaffs_SkipNANDVerification(dev))
+               return;
+
+       for (i = 1; i <= lastChunk; i++) {
+               tn = yaffs_FindLevel0Tnode(dev, &obj->variant.fileVariant, i);
+
+               if (tn) {
+                       __u32 theChunk = yaffs_GetChunkGroupBase(dev, tn, i);
+                       if (theChunk > 0) {
+                               /* T(~0,(TSTR("verifying (%d:%d) %d"TENDSTR),objectId,i,theChunk)); */
+                               yaffs_ReadChunkWithTagsFromNAND(dev, theChunk, NULL, &tags);
+                               if (tags.objectId != objectId || tags.chunkId != i) {
+                                       T(~0, (TSTR("Object %d chunkId %d NAND mismatch chunk %d tags (%d:%d)"TENDSTR),
+                                               objectId, i, theChunk,
+                                               tags.objectId, tags.chunkId));
+                               }
+                       }
+               }
+       }
+}
+
+
+void yaffs_VerifyHardLink(yaffs_Object *obj)
+{
+       if (obj && yaffs_SkipVerification(obj->myDev))
+               return;
+
+       /* Verify sane equivalent object */
+}
+
+void yaffs_VerifySymlink(yaffs_Object *obj)
+{
+       if (obj && yaffs_SkipVerification(obj->myDev))
+               return;
+
+       /* Verify symlink string */
+}
+
+void yaffs_VerifySpecial(yaffs_Object *obj)
+{
+       if (obj && yaffs_SkipVerification(obj->myDev))
+               return;
+}
+
+void yaffs_VerifyObject(yaffs_Object *obj)
+{
+       yaffs_Device *dev;
+
+       __u32 chunkMin;
+       __u32 chunkMax;
+
+       __u32 chunkIdOk;
+       __u32 chunkInRange;
+       __u32 chunkShouldNotBeDeleted;
+       __u32 chunkValid;
+
+       if (!obj)
+               return;
+
+       if (obj->beingCreated)
+               return;
+
+       dev = obj->myDev;
+
+       if (yaffs_SkipVerification(dev))
+               return;
+
+       /* Check sane object header chunk */
+
+       chunkMin = dev->internalStartBlock * dev->param.nChunksPerBlock;
+       chunkMax = (dev->internalEndBlock+1) * dev->param.nChunksPerBlock - 1;
+
+       chunkInRange = (((unsigned)(obj->hdrChunk)) >= chunkMin && ((unsigned)(obj->hdrChunk)) <= chunkMax);
+       chunkIdOk = chunkInRange || (obj->hdrChunk == 0);
+       chunkValid = chunkInRange &&
+                       yaffs_CheckChunkBit(dev,
+                                       obj->hdrChunk / dev->param.nChunksPerBlock,
+                                       obj->hdrChunk % dev->param.nChunksPerBlock);
+       chunkShouldNotBeDeleted = chunkInRange && !chunkValid;
+
+       if (!obj->fake &&
+                       (!chunkIdOk || chunkShouldNotBeDeleted)) {
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d has chunkId %d %s %s"TENDSTR),
+                       obj->objectId, obj->hdrChunk,
+                       chunkIdOk ? "" : ",out of range",
+                       chunkShouldNotBeDeleted ? ",marked as deleted" : ""));
+       }
+
+       if (chunkValid && !yaffs_SkipNANDVerification(dev)) {
+               yaffs_ExtendedTags tags;
+               yaffs_ObjectHeader *oh;
+               __u8 *buffer = yaffs_GetTempBuffer(dev, __LINE__);
+
+               oh = (yaffs_ObjectHeader *)buffer;
+
+               yaffs_ReadChunkWithTagsFromNAND(dev, obj->hdrChunk, buffer,
+                               &tags);
+
+               yaffs_VerifyObjectHeader(obj, oh, &tags, 1);
+
+               yaffs_ReleaseTempBuffer(dev, buffer, __LINE__);
+       }
+
+       /* Verify it has a parent */
+       if (obj && !obj->fake &&
+                       (!obj->parent || obj->parent->myDev != dev)) {
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d has parent pointer %p which does not look like an object"TENDSTR),
+                       obj->objectId, obj->parent));
+       }
+
+       /* Verify parent is a directory */
+       if (obj->parent && obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+               T(YAFFS_TRACE_VERIFY,
+                       (TSTR("Obj %d's parent is not a directory (type %d)"TENDSTR),
+                       obj->objectId, obj->parent->variantType));
+       }
+
+       switch (obj->variantType) {
+       case YAFFS_OBJECT_TYPE_FILE:
+               yaffs_VerifyFile(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_SYMLINK:
+               yaffs_VerifySymlink(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_DIRECTORY:
+               yaffs_VerifyDirectory(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_HARDLINK:
+               yaffs_VerifyHardLink(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_SPECIAL:
+               yaffs_VerifySpecial(obj);
+               break;
+       case YAFFS_OBJECT_TYPE_UNKNOWN:
+       default:
+               T(YAFFS_TRACE_VERIFY,
+               (TSTR("Obj %d has illegaltype %d"TENDSTR),
+               obj->objectId, obj->variantType));
+               break;
+       }
+}
+
+void yaffs_VerifyObjects(yaffs_Device *dev)
+{
+       yaffs_Object *obj;
+       int i;
+       struct ylist_head *lh;
+
+       if (yaffs_SkipVerification(dev))
+               return;
+
+       /* Iterate through the objects in each hash entry */
+
+       for (i = 0; i <  YAFFS_NOBJECT_BUCKETS; i++) {
+               ylist_for_each(lh, &dev->objectBucket[i].list) {
+                       if (lh) {
+                               obj = ylist_entry(lh, yaffs_Object, hashLink);
+                               yaffs_VerifyObject(obj);
+                       }
+               }
+       }
+}
+
+
+void yaffs_VerifyObjectInDirectory(yaffs_Object *obj)
+{
+       struct ylist_head *lh;
+       yaffs_Object *listObj;
+
+       int count = 0;
+
+       if (!obj) {
+               T(YAFFS_TRACE_ALWAYS, (TSTR("No object to verify" TENDSTR)));
+               YBUG();
+               return;
+       }
+
+       if (yaffs_SkipVerification(obj->myDev))
+               return;
+
+       if (!obj->parent) {
+               T(YAFFS_TRACE_ALWAYS, (TSTR("Object does not have parent" TENDSTR)));
+               YBUG();
+               return;
+       }
+
+       if (obj->parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+               T(YAFFS_TRACE_ALWAYS, (TSTR("Parent is not directory" TENDSTR)));
+               YBUG();
+       }
+
+       /* Iterate through the objects in each hash entry */
+
+       ylist_for_each(lh, &obj->parent->variant.directoryVariant.children) {
+               if (lh) {
+                       listObj = ylist_entry(lh, yaffs_Object, siblings);
+                       yaffs_VerifyObject(listObj);
+                       if (obj == listObj)
+                               count++;
+               }
+        }
+
+       if (count != 1) {
+               T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory %d times" TENDSTR), count));
+               YBUG();
+       }
+}
+
+void yaffs_VerifyDirectory(yaffs_Object *directory)
+{
+       struct ylist_head *lh;
+       yaffs_Object *listObj;
+
+       if (!directory) {
+               YBUG();
+               return;
+       }
+
+       if (yaffs_SkipFullVerification(directory->myDev))
+               return;
+
+       if (directory->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+               T(YAFFS_TRACE_ALWAYS, (TSTR("Directory has wrong type: %d" TENDSTR), directory->variantType));
+               YBUG();
+       }
+
+       /* Iterate through the objects in each hash entry */
+
+       ylist_for_each(lh, &directory->variant.directoryVariant.children) {
+               if (lh) {
+                       listObj = ylist_entry(lh, yaffs_Object, siblings);
+                       if (listObj->parent != directory) {
+                               T(YAFFS_TRACE_ALWAYS, (TSTR("Object in directory list has wrong parent %p" TENDSTR), listObj->parent));
+                               YBUG();
+                       }
+                       yaffs_VerifyObjectInDirectory(listObj);
+               }
+       }
+}
+
+static int yaffs_freeVerificationFailures;
+
+void yaffs_VerifyFreeChunks(yaffs_Device *dev)
+{
+       int counted;
+       int difference;
+
+       if (yaffs_SkipVerification(dev))
+               return;
+
+       counted = yaffs_CountFreeChunks(dev);
+
+       difference = dev->nFreeChunks - counted;
+
+       if (difference) {
+               T(YAFFS_TRACE_ALWAYS,
+                 (TSTR("Freechunks verification failure %d %d %d" TENDSTR),
+                  dev->nFreeChunks, counted, difference));
+               yaffs_freeVerificationFailures++;
+       }
+}
+
+int yaffs_VerifyFileSanity(yaffs_Object *in)
+{
+#if 0
+       int chunk;
+       int nChunks;
+       int fSize;
+       int failed = 0;
+       int objId;
+       yaffs_Tnode *tn;
+       yaffs_Tags localTags;
+       yaffs_Tags *tags = &localTags;
+       int theChunk;
+       int chunkDeleted;
+
+       if (in->variantType != YAFFS_OBJECT_TYPE_FILE)
+               return YAFFS_FAIL;
+
+       objId = in->objectId;
+       fSize = in->variant.fileVariant.fileSize;
+       nChunks =
+           (fSize + in->myDev->nDataBytesPerChunk - 1) / in->myDev->nDataBytesPerChunk;
+
+       for (chunk = 1; chunk <= nChunks; chunk++) {
+               tn = yaffs_FindLevel0Tnode(in->myDev, &in->variant.fileVariant,
+                                          chunk);
+
+               if (tn) {
+
+                       theChunk = yaffs_GetChunkGroupBase(dev, tn, chunk);
+
+                       if (yaffs_CheckChunkBits
+                           (dev, theChunk / dev->param.nChunksPerBlock,
+                            theChunk % dev->param.nChunksPerBlock)) {
+
+                               yaffs_ReadChunkTagsFromNAND(in->myDev, theChunk,
+                                                           tags,
+                                                           &chunkDeleted);
+                               if (yaffs_TagsMatch
+                                   (tags, in->objectId, chunk, chunkDeleted)) {
+                                       /* found it; */
+
+                               }
+                       } else {
+
+                               failed = 1;
+                       }
+
+               } else {
+                       /* T(("No level 0 found for %d\n", chunk)); */
+               }
+       }
+
+       return failed ? YAFFS_FAIL : YAFFS_OK;
+#else
+       in=in;
+       return YAFFS_OK;
+#endif
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_verify.h
@@ -0,0 +1,39 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __YAFFS_VERIFY_H__
+#define __YAFFS_VERIFY_H__
+
+#include "yaffs_guts.h"
+
+void yaffs_VerifyBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n);
+void yaffs_VerifyCollectedBlock(yaffs_Device *dev, yaffs_BlockInfo *bi, int n);
+void yaffs_VerifyBlocks(yaffs_Device *dev);
+
+void yaffs_VerifyObjectHeader(yaffs_Object *obj, yaffs_ObjectHeader *oh, yaffs_ExtendedTags *tags, int parentCheck);
+void yaffs_VerifyFile(yaffs_Object *obj);
+void yaffs_VerifyHardLink(yaffs_Object *obj);
+void yaffs_VerifySymlink(yaffs_Object *obj);
+void yaffs_VerifySpecial(yaffs_Object *obj);
+void yaffs_VerifyObject(yaffs_Object *obj);
+void yaffs_VerifyObjects(yaffs_Device *dev);
+void yaffs_VerifyObjectInDirectory(yaffs_Object *obj);
+void yaffs_VerifyDirectory(yaffs_Object *directory);
+void yaffs_VerifyFreeChunks(yaffs_Device *dev);
+
+int yaffs_VerifyFileSanity(yaffs_Object *obj);
+
+int yaffs_SkipVerification(yaffs_Device *dev);
+
+#endif
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_vfs_glue.c
@@ -0,0 +1,3577 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ * Acknowledgements:
+ * Luc van OostenRyck for numerous patches.
+ * Nick Bane for numerous patches.
+ * Nick Bane for 2.5/2.6 integration.
+ * Andras Toth for mknod rdev issue.
+ * Michael Fischer for finding the problem with inode inconsistency.
+ * Some code bodily lifted from JFFS
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+/*
+ *
+ * This is the file system front-end to YAFFS that hooks it up to
+ * the VFS.
+ *
+ * Special notes:
+ * >> 2.4: sb->u.generic_sbp points to the yaffs_Device associated with
+ *         this superblock
+ * >> 2.6: sb->s_fs_info  points to the yaffs_Device associated with this
+ *         superblock
+ * >> inode->u.generic_ip points to the associated yaffs_Object.
+ */
+
+/*
+ * There are two variants of the VFS glue code. This variant should compile
+ * for any version of Linux.
+ */
+#include <linux/version.h>
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 10))
+#define YAFFS_COMPILE_BACKGROUND
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6, 23))
+#define YAFFS_COMPILE_FREEZER
+#endif
+#endif
+
+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,28))
+#define YAFFS_COMPILE_EXPORTFS
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
+#define YAFFS_USE_SETATTR_COPY
+#define YAFFS_USE_TRUNCATE_SETSIZE
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,35))
+#define YAFFS_HAS_EVICT_INODE
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2,6,13))
+#define YAFFS_NEW_FOLLOW_LINK 1
+#else
+#define YAFFS_NEW_FOLLOW_LINK 0
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+#include <linux/config.h>
+#endif
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/init.h>
+#include <linux/fs.h>
+#include <linux/proc_fs.h>
+#include <linux/smp_lock.h>
+#include <linux/pagemap.h>
+#include <linux/mtd/mtd.h>
+#include <linux/interrupt.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+#include <linux/namei.h>
+#endif
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+#include <linux/exportfs.h>
+#endif
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+#include <linux/kthread.h>
+#include <linux/delay.h>
+#endif
+#ifdef YAFFS_COMPILE_FREEZER
+#include <linux/freezer.h>
+#endif
+
+#include <asm/div64.h>
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+#include <linux/statfs.h>
+
+#define UnlockPage(p) unlock_page(p)
+#define Page_Uptodate(page)    test_bit(PG_uptodate, &(page)->flags)
+
+/* FIXME: use sb->s_id instead ? */
+#define yaffs_devname(sb, buf) bdevname(sb->s_bdev, buf)
+
+#else
+
+#include <linux/locks.h>
+#define        BDEVNAME_SIZE           0
+#define        yaffs_devname(sb, buf)  kdevname(sb->s_dev)
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 5, 0))
+/* added NCB 26/5/2006 for 2.4.25-vrs2-tcl1 kernel */
+#define __user
+#endif
+
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 26))
+#define YPROC_ROOT  (&proc_root)
+#else
+#define YPROC_ROOT  NULL
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,26))
+#define Y_INIT_TIMER(a)        init_timer(a)
+#else
+#define Y_INIT_TIMER(a)        init_timer_on_stack(a)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+#define WRITE_SIZE_STR "writesize"
+#define WRITE_SIZE(mtd) ((mtd)->writesize)
+#else
+#define WRITE_SIZE_STR "oobblock"
+#define WRITE_SIZE(mtd) ((mtd)->oobblock)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 27))
+#define YAFFS_USE_WRITE_BEGIN_END 1
+#else
+#define YAFFS_USE_WRITE_BEGIN_END 0
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 28))
+static uint32_t YCALCBLOCKS(uint64_t partition_size, uint32_t block_size)
+{
+       uint64_t result = partition_size;
+       do_div(result, block_size);
+       return (uint32_t)result;
+}
+#else
+#define YCALCBLOCKS(s, b) ((s)/(b))
+#endif
+
+#include <linux/uaccess.h>
+#include <linux/mtd/mtd.h>
+
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_guts.h"
+
+#include "yaffs_linux.h"
+
+#include "yaffs_mtdif.h"
+#include "yaffs_mtdif1.h"
+#include "yaffs_mtdif2.h"
+
+unsigned int yaffs_traceMask = YAFFS_TRACE_BAD_BLOCKS | YAFFS_TRACE_ALWAYS;
+unsigned int yaffs_wr_attempts = YAFFS_WR_ATTEMPTS;
+unsigned int yaffs_auto_checkpoint = 1;
+unsigned int yaffs_gc_control = 1;
+unsigned int yaffs_bg_enable = 1;
+
+/* Module Parameters */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+module_param(yaffs_traceMask, uint, 0644);
+module_param(yaffs_wr_attempts, uint, 0644);
+module_param(yaffs_auto_checkpoint, uint, 0644);
+module_param(yaffs_gc_control, uint, 0644);
+module_param(yaffs_bg_enable, uint, 0644);
+#else
+MODULE_PARM(yaffs_traceMask, "i");
+MODULE_PARM(yaffs_wr_attempts, "i");
+MODULE_PARM(yaffs_auto_checkpoint, "i");
+MODULE_PARM(yaffs_gc_control, "i");
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 25))
+/* use iget and read_inode */
+#define Y_IGET(sb, inum) iget((sb), (inum))
+static void yaffs_read_inode(struct inode *inode);
+
+#else
+/* Call local equivalent */
+#define YAFFS_USE_OWN_IGET
+#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino);
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
+#define yaffs_InodeToObjectLV(iptr) ((iptr)->i_private)
+#else
+#define yaffs_InodeToObjectLV(iptr) ((iptr)->u.generic_ip)
+#endif
+
+#define yaffs_InodeToObject(iptr) ((yaffs_Object *)(yaffs_InodeToObjectLV(iptr)))
+#define yaffs_DentryToObject(dptr) yaffs_InodeToObject((dptr)->d_inode)
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+#define yaffs_SuperToDevice(sb)        ((yaffs_Device *)sb->s_fs_info)
+#else
+#define yaffs_SuperToDevice(sb)        ((yaffs_Device *)sb->u.generic_sbp)
+#endif
+
+
+#define update_dir_time(dir) do {\
+                       (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
+               } while(0)
+               
+static void yaffs_put_super(struct super_block *sb);
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+                               loff_t *pos);
+static ssize_t yaffs_hold_space(struct file *f);
+static void yaffs_release_space(struct file *f);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_file_flush(struct file *file, fl_owner_t id);
+#else
+static int yaffs_file_flush(struct file *file);
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+static int yaffs_sync_object(struct file *file, int datasync);
+#else
+static int yaffs_sync_object(struct file *file, struct dentry *dentry,
+                               int datasync);
+#endif
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+                       struct nameidata *n);
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+                                       struct nameidata *n);
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode);
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry);
+#endif
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+                       struct dentry *dentry);
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry);
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+                       const char *symname);
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+                       dev_t dev);
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+                       int dev);
+#endif
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+                       struct inode *new_dir, struct dentry *new_dentry);
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr);
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_sync_fs(struct super_block *sb, int wait);
+static void yaffs_write_super(struct super_block *sb);
+#else
+static int yaffs_sync_fs(struct super_block *sb);
+static int yaffs_write_super(struct super_block *sb);
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf);
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf);
+#endif
+
+#ifdef YAFFS_HAS_PUT_INODE
+static void yaffs_put_inode(struct inode *inode);
+#endif
+
+#ifdef YAFFS_HAS_EVICT_INODE
+static void yaffs_evict_inode(struct inode *);
+#else
+static void yaffs_delete_inode(struct inode *);
+static void yaffs_clear_inode(struct inode *);
+#endif
+
+static int yaffs_readpage(struct file *file, struct page *page);
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc);
+#else
+static int yaffs_writepage(struct page *page);
+#endif
+
+#ifdef CONFIG_YAFFS_XATTR
+int yaffs_setxattr(struct dentry *dentry, const char *name,
+                       const void *value, size_t size, int flags);
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+                       size_t size);
+int yaffs_removexattr(struct dentry *dentry, const char *name);
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size);
+#endif
+
+
+#if (YAFFS_USE_WRITE_BEGIN_END != 0)
+static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
+                               loff_t pos, unsigned len, unsigned flags,
+                               struct page **pagep, void **fsdata);
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+                               loff_t pos, unsigned len, unsigned copied,
+                               struct page *pg, void *fsdadata);
+#else
+static int yaffs_prepare_write(struct file *f, struct page *pg,
+                               unsigned offset, unsigned to);
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
+                               unsigned to);
+
+#endif
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
+                               int buflen);
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias);
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd);
+#endif
+
+static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev);
+
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin);
+
+static int yaffs_vfs_setattr(struct inode *, struct iattr *);
+
+
+static struct address_space_operations yaffs_file_address_operations = {
+       .readpage = yaffs_readpage,
+       .writepage = yaffs_writepage,
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+       .write_begin = yaffs_write_begin,
+       .write_end = yaffs_write_end,
+#else
+       .prepare_write = yaffs_prepare_write,
+       .commit_write = yaffs_commit_write,
+#endif
+};
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
+static const struct file_operations yaffs_file_operations = {
+       .read = do_sync_read,
+       .write = do_sync_write,
+       .aio_read = generic_file_aio_read,
+       .aio_write = generic_file_aio_write,
+       .mmap = generic_file_mmap,
+       .flush = yaffs_file_flush,
+       .fsync = yaffs_sync_object,
+       .splice_read = generic_file_splice_read,
+       .splice_write = generic_file_splice_write,
+       .llseek = generic_file_llseek,
+};
+
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
+
+static const struct file_operations yaffs_file_operations = {
+       .read = do_sync_read,
+       .write = do_sync_write,
+       .aio_read = generic_file_aio_read,
+       .aio_write = generic_file_aio_write,
+       .mmap = generic_file_mmap,
+       .flush = yaffs_file_flush,
+       .fsync = yaffs_sync_object,
+       .sendfile = generic_file_sendfile,
+};
+
+#else
+
+static const struct file_operations yaffs_file_operations = {
+       .read = generic_file_read,
+       .write = generic_file_write,
+       .mmap = generic_file_mmap,
+       .flush = yaffs_file_flush,
+       .fsync = yaffs_sync_object,
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+       .sendfile = generic_file_sendfile,
+#endif
+};
+#endif
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2,6,25))
+static void zero_user_segment(struct page *page, unsigned start, unsigned end)
+{
+       void * kaddr = kmap_atomic(page, KM_USER0);
+       memset(kaddr + start, 0, end - start);
+       kunmap_atomic(kaddr, KM_USER0);
+       flush_dcache_page(page);
+}
+#endif
+
+
+static const struct inode_operations yaffs_file_inode_operations = {
+       .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+       .setxattr = yaffs_setxattr,
+       .getxattr = yaffs_getxattr,
+       .listxattr = yaffs_listxattr,
+       .removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct inode_operations yaffs_symlink_inode_operations = {
+       .readlink = yaffs_readlink,
+       .follow_link = yaffs_follow_link,
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+       .put_link = yaffs_put_link,
+#endif
+       .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+       .setxattr = yaffs_setxattr,
+       .getxattr = yaffs_getxattr,
+       .listxattr = yaffs_listxattr,
+       .removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct inode_operations yaffs_dir_inode_operations = {
+       .create = yaffs_create,
+       .lookup = yaffs_lookup,
+       .link = yaffs_link,
+       .unlink = yaffs_unlink,
+       .symlink = yaffs_symlink,
+       .mkdir = yaffs_mkdir,
+       .rmdir = yaffs_unlink,
+       .mknod = yaffs_mknod,
+       .rename = yaffs_rename,
+       .setattr = yaffs_setattr,
+#ifdef CONFIG_YAFFS_XATTR
+       .setxattr = yaffs_setxattr,
+       .getxattr = yaffs_getxattr,
+       .listxattr = yaffs_listxattr,
+       .removexattr = yaffs_removexattr,
+#endif
+};
+
+static const struct file_operations yaffs_dir_operations = {
+       .read = generic_read_dir,
+       .readdir = yaffs_readdir,
+       .fsync = yaffs_sync_object,
+       .llseek = yaffs_dir_llseek,
+};
+
+static const struct super_operations yaffs_super_ops = {
+       .statfs = yaffs_statfs,
+
+#ifndef YAFFS_USE_OWN_IGET
+       .read_inode = yaffs_read_inode,
+#endif
+#ifdef YAFFS_HAS_PUT_INODE
+       .put_inode = yaffs_put_inode,
+#endif
+       .put_super = yaffs_put_super,
+#ifdef YAFFS_HAS_EVICT_INODE
+       .evict_inode = yaffs_evict_inode,
+#else
+       .delete_inode = yaffs_delete_inode,
+       .clear_inode = yaffs_clear_inode,
+#endif
+       .sync_fs = yaffs_sync_fs,
+       .write_super = yaffs_write_super,
+};
+
+
+static  int yaffs_vfs_setattr(struct inode *inode, struct iattr *attr)
+{
+#ifdef  YAFFS_USE_SETATTR_COPY
+       setattr_copy(inode,attr);
+       return 0;
+#else
+       return inode_setattr(inode, attr);
+#endif
+
+}
+
+static  int yaffs_vfs_setsize(struct inode *inode, loff_t newsize)
+{
+#ifdef  YAFFS_USE_TRUNCATE_SETSIZE
+       truncate_setsize(inode,newsize);
+       return 0;
+#else
+       truncate_inode_pages(&inode->i_data,newsize);
+       return 0;
+#endif
+
+}
+
+static unsigned yaffs_gc_control_callback(yaffs_Device *dev)
+{
+       return yaffs_gc_control;
+}
+                                                                                                                       
+static void yaffs_GrossLock(yaffs_Device *dev)
+{
+       T(YAFFS_TRACE_LOCK, (TSTR("yaffs locking %p\n"), current));
+       down(&(yaffs_DeviceToLC(dev)->grossLock));
+       T(YAFFS_TRACE_LOCK, (TSTR("yaffs locked %p\n"), current));
+}
+
+static void yaffs_GrossUnlock(yaffs_Device *dev)
+{
+       T(YAFFS_TRACE_LOCK, (TSTR("yaffs unlocking %p\n"), current));
+       up(&(yaffs_DeviceToLC(dev)->grossLock));
+}
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+
+static struct inode *
+yaffs2_nfs_get_inode(struct super_block *sb, uint64_t ino, uint32_t generation)
+{
+       return Y_IGET(sb, ino);
+}
+
+static struct dentry *
+yaffs2_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+       return generic_fh_to_dentry(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode) ;
+}
+
+static struct dentry *
+ yaffs2_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, int fh_type)
+{
+       return generic_fh_to_parent(sb, fid, fh_len, fh_type, yaffs2_nfs_get_inode);
+}
+
+struct dentry *yaffs2_get_parent(struct dentry *dentry)
+{
+
+       struct super_block *sb = dentry->d_inode->i_sb;
+       struct dentry *parent = ERR_PTR(-ENOENT);
+       struct inode *inode;
+       unsigned long parent_ino;
+       yaffs_Object *d_obj;
+       yaffs_Object *parent_obj;
+
+       d_obj = yaffs_InodeToObject(dentry->d_inode);
+
+       if (d_obj) {
+               parent_obj = d_obj->parent;
+               if (parent_obj) {
+                       parent_ino = yaffs_GetObjectInode(parent_obj);
+                       inode = Y_IGET(sb, parent_ino);
+
+                       if (IS_ERR(inode)) {
+                               parent = ERR_CAST(inode);
+                       } else {
+                               parent = d_obtain_alias(inode);
+                               if (!IS_ERR(parent)) {
+                                       parent = ERR_PTR(-ENOMEM);
+                                       iput(inode);
+                               }
+                       }
+               }
+       }
+
+       return parent;
+}
+
+/* Just declare a zero structure as a NULL value implies
+ * using the default functions of exportfs.
+ */
+
+static struct export_operations yaffs_export_ops =
+{
+       .fh_to_dentry = yaffs2_fh_to_dentry,
+       .fh_to_parent = yaffs2_fh_to_parent,
+       .get_parent = yaffs2_get_parent,
+} ;
+
+#endif
+
+/*-----------------------------------------------------------------*/
+/* Directory search context allows us to unlock access to yaffs during
+ * filldir without causing problems with the directory being modified.
+ * This is similar to the tried and tested mechanism used in yaffs direct.
+ *
+ * A search context iterates along a doubly linked list of siblings in the
+ * directory. If the iterating object is deleted then this would corrupt
+ * the list iteration, likely causing a crash. The search context avoids
+ * this by using the removeObjectCallback to move the search context to the
+ * next object before the object is deleted.
+ *
+ * Many readdirs (and thus seach conexts) may be alive simulateously so
+ * each yaffs_Device has a list of these.
+ *
+ * A seach context lives for the duration of a readdir.
+ *
+ * All these functions must be called while yaffs is locked.
+ */
+
+struct yaffs_SearchContext {
+       yaffs_Device *dev;
+       yaffs_Object *dirObj;
+       yaffs_Object *nextReturn;
+       struct ylist_head others;
+};
+
+/*
+ * yaffs_NewSearch() creates a new search context, initialises it and
+ * adds it to the device's search context list.
+ *
+ * Called at start of readdir.
+ */
+static struct yaffs_SearchContext * yaffs_NewSearch(yaffs_Object *dir)
+{
+       yaffs_Device *dev = dir->myDev;
+       struct yaffs_SearchContext *sc = YMALLOC(sizeof(struct yaffs_SearchContext));
+       if(sc){
+               sc->dirObj = dir;
+               sc->dev = dev;
+               if( ylist_empty(&sc->dirObj->variant.directoryVariant.children))
+                       sc->nextReturn = NULL;
+               else
+                       sc->nextReturn = ylist_entry(
+                                dir->variant.directoryVariant.children.next,
+                               yaffs_Object,siblings);
+               YINIT_LIST_HEAD(&sc->others);
+               ylist_add(&sc->others,&(yaffs_DeviceToLC(dev)->searchContexts));
+       }
+       return sc;
+}
+
+/*
+ * yaffs_EndSearch() disposes of a search context and cleans up.
+ */
+static void yaffs_EndSearch(struct yaffs_SearchContext * sc)
+{
+       if(sc){
+               ylist_del(&sc->others);
+               YFREE(sc);
+       }
+}
+
+/*
+ * yaffs_SearchAdvance() moves a search context to the next object.
+ * Called when the search iterates or when an object removal causes
+ * the search context to be moved to the next object.
+ */
+static void yaffs_SearchAdvance(struct yaffs_SearchContext *sc)
+{
+        if(!sc)
+                return;
+
+        if( sc->nextReturn == NULL ||
+                ylist_empty(&sc->dirObj->variant.directoryVariant.children))
+                sc->nextReturn = NULL;
+        else {
+                struct ylist_head *next = sc->nextReturn->siblings.next;
+
+                if( next == &sc->dirObj->variant.directoryVariant.children)
+                        sc->nextReturn = NULL; /* end of list */
+                else
+                        sc->nextReturn = ylist_entry(next,yaffs_Object,siblings);
+        }
+}
+
+/*
+ * yaffs_RemoveObjectCallback() is called when an object is unlinked.
+ * We check open search contexts and advance any which are currently
+ * on the object being iterated.
+ */
+static void yaffs_RemoveObjectCallback(yaffs_Object *obj)
+{
+
+        struct ylist_head *i;
+        struct yaffs_SearchContext *sc;
+        struct ylist_head *search_contexts = &(yaffs_DeviceToLC(obj->myDev)->searchContexts);
+
+
+        /* Iterate through the directory search contexts.
+         * If any are currently on the object being removed, then advance
+         * the search context to the next object to prevent a hanging pointer.
+         */
+         ylist_for_each(i, search_contexts) {
+                if (i) {
+                        sc = ylist_entry(i, struct yaffs_SearchContext,others);
+                        if(sc->nextReturn == obj)
+                                yaffs_SearchAdvance(sc);
+                }
+       }
+
+}
+
+
+/*-----------------------------------------------------------------*/
+
+static int yaffs_readlink(struct dentry *dentry, char __user *buffer,
+                       int buflen)
+{
+       unsigned char *alias;
+       int ret;
+
+       yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+       yaffs_GrossLock(dev);
+
+       alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+
+       yaffs_GrossUnlock(dev);
+
+       if (!alias)
+               return -ENOMEM;
+
+       ret = vfs_readlink(dentry, buffer, buflen, alias);
+       kfree(alias);
+       return ret;
+}
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+#else
+static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
+#endif
+{
+       unsigned char *alias;
+       int ret;
+       yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+
+       yaffs_GrossLock(dev);
+
+       alias = yaffs_GetSymlinkAlias(yaffs_DentryToObject(dentry));
+       yaffs_GrossUnlock(dev);
+
+       if (!alias) {
+               ret = -ENOMEM;
+               goto out;
+       }
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+       nd_set_link(nd, alias);
+       ret = (int)alias;
+out:
+       return ERR_PTR(ret);
+#else
+       ret = vfs_follow_link(nd, alias);
+       kfree(alias);
+out:
+       return ret;
+#endif
+}
+
+#if (YAFFS_NEW_FOLLOW_LINK == 1)
+void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias) {
+       kfree(alias);
+}
+#endif
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+                               yaffs_Object *obj);
+
+/*
+ * Lookup is used to find objects in the fs
+ */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
+                               struct nameidata *n)
+#else
+static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry)
+#endif
+{
+       yaffs_Object *obj;
+       struct inode *inode = NULL;     /* NCB 2.5/2.6 needs NULL here */
+
+       yaffs_Device *dev = yaffs_InodeToObject(dir)->myDev;
+
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossLock(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_lookup for %d:%s\n"),
+               yaffs_InodeToObject(dir)->objectId, dentry->d_name.name));
+
+       obj = yaffs_FindObjectByName(yaffs_InodeToObject(dir),
+                                       dentry->d_name.name);
+
+       obj = yaffs_GetEquivalentObject(obj);   /* in case it was a hardlink */
+
+       /* Can't hold gross lock when calling yaffs_get_inode() */
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossUnlock(dev);
+
+       if (obj) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_lookup found %d\n"), obj->objectId));
+
+               inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+
+               if (inode) {
+                       T(YAFFS_TRACE_OS,
+                               (TSTR("yaffs_loookup dentry \n")));
+/* #if 0 asserted by NCB for 2.5/6 compatability - falls through to
+ * d_add even if NULL inode */
+#if 0
+                       /*dget(dentry); // try to solve directory bug */
+                       d_add(dentry, inode);
+
+                       /* return dentry; */
+                       return NULL;
+#endif
+               }
+
+       } else {
+               T(YAFFS_TRACE_OS,(TSTR("yaffs_lookup not found\n")));
+
+       }
+
+/* added NCB for 2.5/6 compatability - forces add even if inode is
+ * NULL which creates dentry hash */
+       d_add(dentry, inode);
+
+       return NULL;
+}
+
+
+#ifdef YAFFS_HAS_PUT_INODE
+
+/* For now put inode is just for debugging
+ * Put inode is called when the inode **structure** is put.
+ */
+static void yaffs_put_inode(struct inode *inode)
+{
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_put_inode: ino %d, count %d\n"), (int)inode->i_ino,
+               atomic_read(&inode->i_count)));
+
+}
+#endif
+
+
+static void yaffs_UnstitchObject(struct inode *inode, yaffs_Object *obj)
+{
+       /* Clear the association between the inode and
+        * the yaffs_Object.
+        */
+       obj->myInode = NULL;
+       yaffs_InodeToObjectLV(inode) = NULL;
+
+       /* If the object freeing was deferred, then the real
+        * free happens now.
+        * This should fix the inode inconsistency problem.
+        */
+       yaffs_HandleDeferedFree(obj);
+}
+
+#ifdef YAFFS_HAS_EVICT_INODE
+/* yaffs_evict_inode combines into one operation what was previously done in
+ * yaffs_clear_inode() and yaffs_delete_inode()
+ *
+ */
+static void yaffs_evict_inode( struct inode *inode)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+       int deleteme = 0;
+
+       obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_evict_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+               atomic_read(&inode->i_count),
+               obj ? "object exists" : "null object"));
+
+       if (!inode->i_nlink && !is_bad_inode(inode))
+               deleteme = 1;
+       truncate_inode_pages(&inode->i_data,0);
+       end_writeback(inode);
+
+       if(deleteme && obj){
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               yaffs_DeleteObject(obj);
+               yaffs_GrossUnlock(dev);
+       }
+       if (obj) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               yaffs_UnstitchObject(inode,obj);
+               yaffs_GrossUnlock(dev);
+       }
+
+
+}
+#else
+
+/* clear is called to tell the fs to release any per-inode data it holds.
+ * The object might still exist on disk and is just being thrown out of the cache
+ * or else the object has actually been deleted and we're being called via
+ * the chain
+ *   yaffs_delete_inode() -> clear_inode()->yaffs_clear_inode()
+ */
+
+static void yaffs_clear_inode(struct inode *inode)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+
+       obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_clear_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+               atomic_read(&inode->i_count),
+               obj ? "object exists" : "null object"));
+
+       if (obj) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               yaffs_UnstitchObject(inode,obj);
+               yaffs_GrossUnlock(dev);
+       }
+
+}
+
+/* delete is called when the link count is zero and the inode
+ * is put (ie. nobody wants to know about it anymore, time to
+ * delete the file).
+ * NB Must call clear_inode()
+ */
+static void yaffs_delete_inode(struct inode *inode)
+{
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+       yaffs_Device *dev;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_delete_inode: ino %d, count %d %s\n"), (int)inode->i_ino,
+               atomic_read(&inode->i_count),
+               obj ? "object exists" : "null object"));
+
+       if (obj) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               yaffs_DeleteObject(obj);
+               yaffs_GrossUnlock(dev);
+       }
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 13))
+       truncate_inode_pages(&inode->i_data, 0);
+#endif
+       clear_inode(inode);
+}
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_file_flush(struct file *file, fl_owner_t id)
+#else
+static int yaffs_file_flush(struct file *file)
+#endif
+{
+       yaffs_Object *obj = yaffs_DentryToObject(file->f_dentry);
+
+       yaffs_Device *dev = obj->myDev;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_file_flush object %d (%s)\n"), obj->objectId,
+               obj->dirty ? "dirty" : "clean"));
+
+       yaffs_GrossLock(dev);
+
+       yaffs_FlushFile(obj, 1, 0);
+
+       yaffs_GrossUnlock(dev);
+
+       return 0;
+}
+
+static int yaffs_readpage_nolock(struct file *f, struct page *pg)
+{
+       /* Lifted from jffs2 */
+
+       yaffs_Object *obj;
+       unsigned char *pg_buf;
+       int ret;
+
+       yaffs_Device *dev;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_readpage_nolock at %08x, size %08x\n"),
+               (unsigned)(pg->index << PAGE_CACHE_SHIFT),
+               (unsigned)PAGE_CACHE_SIZE));
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+       BUG_ON(!PageLocked(pg));
+#else
+       if (!PageLocked(pg))
+               PAGE_BUG(pg);
+#endif
+
+       pg_buf = kmap(pg);
+       /* FIXME: Can kmap fail? */
+
+       yaffs_GrossLock(dev);
+
+       ret = yaffs_ReadDataFromFile(obj, pg_buf,
+                               pg->index << PAGE_CACHE_SHIFT,
+                               PAGE_CACHE_SIZE);
+
+       yaffs_GrossUnlock(dev);
+
+       if (ret >= 0)
+               ret = 0;
+
+       if (ret) {
+               ClearPageUptodate(pg);
+               SetPageError(pg);
+       } else {
+               SetPageUptodate(pg);
+               ClearPageError(pg);
+       }
+
+       flush_dcache_page(pg);
+       kunmap(pg);
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage_nolock done\n")));
+       return ret;
+}
+
+static int yaffs_readpage_unlock(struct file *f, struct page *pg)
+{
+       int ret = yaffs_readpage_nolock(f, pg);
+       UnlockPage(pg);
+       return ret;
+}
+
+static int yaffs_readpage(struct file *f, struct page *pg)
+{
+       int ret;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage\n")));
+       ret=yaffs_readpage_unlock(f, pg);
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_readpage done\n")));
+       return ret;
+}
+
+/* writepage inspired by/stolen from smbfs */
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_writepage(struct page *page, struct writeback_control *wbc)
+#else
+static int yaffs_writepage(struct page *page)
+#endif
+{
+       yaffs_Device *dev;
+       struct address_space *mapping = page->mapping;
+       struct inode *inode;
+       unsigned long end_index;
+       char *buffer;
+       yaffs_Object *obj;
+       int nWritten = 0;
+       unsigned nBytes;
+       loff_t i_size;
+
+       if (!mapping)
+               BUG();
+       inode = mapping->host;
+       if (!inode)
+               BUG();
+       i_size = i_size_read(inode);
+
+       end_index = i_size >> PAGE_CACHE_SHIFT;
+
+       if(page->index < end_index)
+               nBytes = PAGE_CACHE_SIZE;
+       else {
+               nBytes = i_size & (PAGE_CACHE_SIZE -1);
+
+               if (page->index > end_index || !nBytes) {
+                       T(YAFFS_TRACE_OS,
+                               (TSTR("yaffs_writepage at %08x, inode size = %08x!!!\n"),
+                               (unsigned)(page->index << PAGE_CACHE_SHIFT),
+                               (unsigned)inode->i_size));
+                       T(YAFFS_TRACE_OS,
+                               (TSTR("                -> don't care!!\n")));
+
+                       zero_user_segment(page,0,PAGE_CACHE_SIZE);
+                       set_page_writeback(page);
+                       unlock_page(page);
+                       end_page_writeback(page);
+                       return 0;
+               }
+       }
+
+       if(nBytes != PAGE_CACHE_SIZE)
+               zero_user_segment(page,nBytes,PAGE_CACHE_SIZE);
+
+       get_page(page);
+
+       buffer = kmap(page);
+
+       obj = yaffs_InodeToObject(inode);
+       dev = obj->myDev;
+       yaffs_GrossLock(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_writepage at %08x, size %08x\n"),
+               (unsigned)(page->index << PAGE_CACHE_SHIFT), nBytes));
+       T(YAFFS_TRACE_OS,
+               (TSTR("writepag0: obj = %05x, ino = %05x\n"),
+               (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
+
+       nWritten = yaffs_WriteDataToFile(obj, buffer,
+                       page->index << PAGE_CACHE_SHIFT, nBytes, 0);
+
+       yaffs_MarkSuperBlockDirty(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("writepag1: obj = %05x, ino = %05x\n"),
+               (int)obj->variant.fileVariant.fileSize, (int)inode->i_size));
+
+       yaffs_GrossUnlock(dev);
+
+       kunmap(page);
+       set_page_writeback(page);
+       unlock_page(page);
+       end_page_writeback(page);
+       put_page(page);
+
+       return (nWritten == nBytes) ? 0 : -ENOSPC;
+}
+
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+static int yaffs_write_begin(struct file *filp, struct address_space *mapping,
+                               loff_t pos, unsigned len, unsigned flags,
+                               struct page **pagep, void **fsdata)
+{
+       struct page *pg = NULL;
+       pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+
+       int ret = 0;
+       int space_held = 0;
+
+       /* Get a page */
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 28)
+       pg = grab_cache_page_write_begin(mapping, index, flags);
+#else
+       pg = __grab_cache_page(mapping, index);
+#endif
+
+       *pagep = pg;
+       if (!pg) {
+               ret =  -ENOMEM;
+               goto out;
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("start yaffs_write_begin index %d(%x) uptodate %d\n"),
+               (int)index,(int)index,Page_Uptodate(pg) ? 1 : 0));
+
+       /* Get fs space */
+       space_held = yaffs_hold_space(filp);
+
+       if (!space_held) {
+               ret = -ENOSPC;
+               goto out;
+       }
+
+       /* Update page if required */
+
+       if (!Page_Uptodate(pg))
+               ret = yaffs_readpage_nolock(filp, pg);
+
+       if (ret)
+               goto out;
+
+       /* Happy path return */
+       T(YAFFS_TRACE_OS, (TSTR("end yaffs_write_begin - ok\n")));
+
+       return 0;
+
+out:
+       T(YAFFS_TRACE_OS,
+               (TSTR("end yaffs_write_begin fail returning %d\n"), ret));
+       if (space_held)
+               yaffs_release_space(filp);
+       if (pg) {
+               unlock_page(pg);
+               page_cache_release(pg);
+       }
+       return ret;
+}
+
+#else
+
+static int yaffs_prepare_write(struct file *f, struct page *pg,
+                               unsigned offset, unsigned to)
+{
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_prepair_write\n")));
+
+       if (!Page_Uptodate(pg))
+               return yaffs_readpage_nolock(f, pg);
+       return 0;
+}
+#endif
+
+#if (YAFFS_USE_WRITE_BEGIN_END > 0)
+static int yaffs_write_end(struct file *filp, struct address_space *mapping,
+                               loff_t pos, unsigned len, unsigned copied,
+                               struct page *pg, void *fsdadata)
+{
+       int ret = 0;
+       void *addr, *kva;
+       uint32_t offset_into_page = pos & (PAGE_CACHE_SIZE - 1);
+
+       kva = kmap(pg);
+       addr = kva + offset_into_page;
+
+       T(YAFFS_TRACE_OS,
+               ("yaffs_write_end addr %p pos %x nBytes %d\n",
+               addr,(unsigned)pos, copied));
+
+       ret = yaffs_file_write(filp, addr, copied, &pos);
+
+       if (ret != copied) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_write_end not same size ret %d  copied %d\n"),
+                       ret, copied));
+               SetPageError(pg);
+       } else {
+               /* Nothing */
+       }
+
+       kunmap(pg);
+
+       yaffs_release_space(filp);
+       unlock_page(pg);
+       page_cache_release(pg);
+       return ret;
+}
+#else
+
+static int yaffs_commit_write(struct file *f, struct page *pg, unsigned offset,
+                               unsigned to)
+{
+       void *addr, *kva;
+
+       loff_t pos = (((loff_t) pg->index) << PAGE_CACHE_SHIFT) + offset;
+       int nBytes = to - offset;
+       int nWritten;
+
+       unsigned spos = pos;
+       unsigned saddr;
+
+       kva = kmap(pg);
+       addr = kva + offset;
+
+       saddr = (unsigned) addr;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_commit_write addr %x pos %x nBytes %d\n"),
+               saddr, spos, nBytes));
+
+       nWritten = yaffs_file_write(f, addr, nBytes, &pos);
+
+       if (nWritten != nBytes) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_commit_write not same size nWritten %d  nBytes %d\n"),
+                       nWritten, nBytes));
+               SetPageError(pg);
+       } else {
+               /* Nothing */
+       }
+
+       kunmap(pg);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_commit_write returning %d\n"),
+               nWritten == nBytes ? 0 : nWritten));
+
+       return nWritten == nBytes ? 0 : nWritten;
+}
+#endif
+
+
+static void yaffs_FillInodeFromObject(struct inode *inode, yaffs_Object *obj)
+{
+       if (inode && obj) {
+
+
+               /* Check mode against the variant type and attempt to repair if broken. */
+               __u32 mode = obj->yst_mode;
+               switch (obj->variantType) {
+               case YAFFS_OBJECT_TYPE_FILE:
+                       if (!S_ISREG(mode)) {
+                               obj->yst_mode &= ~S_IFMT;
+                               obj->yst_mode |= S_IFREG;
+                       }
+
+                       break;
+               case YAFFS_OBJECT_TYPE_SYMLINK:
+                       if (!S_ISLNK(mode)) {
+                               obj->yst_mode &= ~S_IFMT;
+                               obj->yst_mode |= S_IFLNK;
+                       }
+
+                       break;
+               case YAFFS_OBJECT_TYPE_DIRECTORY:
+                       if (!S_ISDIR(mode)) {
+                               obj->yst_mode &= ~S_IFMT;
+                               obj->yst_mode |= S_IFDIR;
+                       }
+
+                       break;
+               case YAFFS_OBJECT_TYPE_UNKNOWN:
+               case YAFFS_OBJECT_TYPE_HARDLINK:
+               case YAFFS_OBJECT_TYPE_SPECIAL:
+               default:
+                       /* TODO? */
+                       break;
+               }
+
+               inode->i_flags |= S_NOATIME;
+
+               inode->i_ino = obj->objectId;
+               inode->i_mode = obj->yst_mode;
+               inode->i_uid = obj->yst_uid;
+               inode->i_gid = obj->yst_gid;
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
+               inode->i_blksize = inode->i_sb->s_blocksize;
+#endif
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+
+               inode->i_rdev = old_decode_dev(obj->yst_rdev);
+               inode->i_atime.tv_sec = (time_t) (obj->yst_atime);
+               inode->i_atime.tv_nsec = 0;
+               inode->i_mtime.tv_sec = (time_t) obj->yst_mtime;
+               inode->i_mtime.tv_nsec = 0;
+               inode->i_ctime.tv_sec = (time_t) obj->yst_ctime;
+               inode->i_ctime.tv_nsec = 0;
+#else
+               inode->i_rdev = obj->yst_rdev;
+               inode->i_atime = obj->yst_atime;
+               inode->i_mtime = obj->yst_mtime;
+               inode->i_ctime = obj->yst_ctime;
+#endif
+               inode->i_size = yaffs_GetObjectFileLength(obj);
+               inode->i_blocks = (inode->i_size + 511) >> 9;
+
+               inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_FillInode mode %x uid %d gid %d size %d count %d\n"),
+                       inode->i_mode, inode->i_uid, inode->i_gid,
+                       (int)inode->i_size, atomic_read(&inode->i_count)));
+
+               switch (obj->yst_mode & S_IFMT) {
+               default:        /* fifo, device or socket */
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+                       init_special_inode(inode, obj->yst_mode,
+                                       old_decode_dev(obj->yst_rdev));
+#else
+                       init_special_inode(inode, obj->yst_mode,
+                                       (dev_t) (obj->yst_rdev));
+#endif
+                       break;
+               case S_IFREG:   /* file */
+                       inode->i_op = &yaffs_file_inode_operations;
+                       inode->i_fop = &yaffs_file_operations;
+                       inode->i_mapping->a_ops =
+                               &yaffs_file_address_operations;
+                       break;
+               case S_IFDIR:   /* directory */
+                       inode->i_op = &yaffs_dir_inode_operations;
+                       inode->i_fop = &yaffs_dir_operations;
+                       break;
+               case S_IFLNK:   /* symlink */
+                       inode->i_op = &yaffs_symlink_inode_operations;
+                       break;
+               }
+
+               yaffs_InodeToObjectLV(inode) = obj;
+
+               obj->myInode = inode;
+
+       } else {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_FileInode invalid parameters\n")));
+       }
+
+}
+
+struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
+                               yaffs_Object *obj)
+{
+       struct inode *inode;
+
+       if (!sb) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_get_inode for NULL super_block!!\n")));
+               return NULL;
+
+       }
+
+       if (!obj) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_get_inode for NULL object!!\n")));
+               return NULL;
+
+       }
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_get_inode for object %d\n"), obj->objectId));
+
+       inode = Y_IGET(sb, obj->objectId);
+       if (IS_ERR(inode))
+               return NULL;
+
+       /* NB Side effect: iget calls back to yaffs_read_inode(). */
+       /* iget also increments the inode's i_count */
+       /* NB You can't be holding grossLock or deadlock will happen! */
+
+       return inode;
+}
+
+static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
+                               loff_t *pos)
+{
+       yaffs_Object *obj;
+       int nWritten, ipos;
+       struct inode *inode;
+       yaffs_Device *dev;
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       inode = f->f_dentry->d_inode;
+
+       if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
+               ipos = inode->i_size;
+       else
+               ipos = *pos;
+
+       if (!obj)
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_file_write: hey obj is null!\n")));
+       else
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_file_write about to write writing %u(%x) bytes"
+                       "to object %d at %d(%x)\n"),
+                       (unsigned) n, (unsigned) n, obj->objectId, ipos,ipos));
+
+       nWritten = yaffs_WriteDataToFile(obj, buf, ipos, n, 0);
+
+       yaffs_MarkSuperBlockDirty(dev);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_file_write: %d(%x) bytes written\n"),
+               (unsigned )n,(unsigned)n));
+
+       if (nWritten > 0) {
+               ipos += nWritten;
+               *pos = ipos;
+               if (ipos > inode->i_size) {
+                       inode->i_size = ipos;
+                       inode->i_blocks = (ipos + 511) >> 9;
+
+                       T(YAFFS_TRACE_OS,
+                               (TSTR("yaffs_file_write size updated to %d bytes, "
+                               "%d blocks\n"),
+                               ipos, (int)(inode->i_blocks)));
+               }
+
+       }
+       yaffs_GrossUnlock(dev);
+       return (nWritten == 0) && (n > 0) ? -ENOSPC : nWritten;
+}
+
+/* Space holding and freeing is done to ensure we have space available for write_begin/end */
+/* For now we just assume few parallel writes and check against a small number. */
+/* Todo: need to do this with a counter to handle parallel reads better */
+
+static ssize_t yaffs_hold_space(struct file *f)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+
+       int nFreeChunks;
+
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       nFreeChunks = yaffs_GetNumberOfFreeChunks(dev);
+
+       yaffs_GrossUnlock(dev);
+
+       return (nFreeChunks > 20) ? 1 : 0;
+}
+
+static void yaffs_release_space(struct file *f)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+
+       yaffs_GrossUnlock(dev);
+}
+
+
+static loff_t yaffs_dir_llseek(struct file *file, loff_t offset, int origin)
+{
+       long long retval;
+
+       lock_kernel();
+
+       switch (origin){
+       case 2:
+               offset += i_size_read(file->f_path.dentry->d_inode);
+               break;
+       case 1:
+               offset += file->f_pos;
+       }
+       retval = -EINVAL;
+
+       if (offset >= 0){
+               if (offset != file->f_pos)
+                       file->f_pos = offset;
+
+               retval = offset;
+       }
+       unlock_kernel();
+       return retval;
+}
+
+
+static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+        struct yaffs_SearchContext *sc;
+       struct inode *inode = f->f_dentry->d_inode;
+       unsigned long offset, curoffs;
+       yaffs_Object *l;
+        int retVal = 0;
+
+       char name[YAFFS_MAX_NAME_LENGTH + 1];
+
+       obj = yaffs_DentryToObject(f->f_dentry);
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       yaffs_DeviceToLC(dev)->readdirProcess = current;
+
+       offset = f->f_pos;
+
+        sc = yaffs_NewSearch(obj);
+        if(!sc){
+                retVal = -ENOMEM;
+                goto out;
+        }
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_readdir: starting at %d\n"), (int)offset));
+
+       if (offset == 0) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_readdir: entry . ino %d \n"),
+                       (int)inode->i_ino));
+               yaffs_GrossUnlock(dev);
+               if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0){
+                       yaffs_GrossLock(dev);
+                       goto out;
+               }
+               yaffs_GrossLock(dev);
+               offset++;
+               f->f_pos++;
+       }
+       if (offset == 1) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_readdir: entry .. ino %d \n"),
+                       (int)f->f_dentry->d_parent->d_inode->i_ino));
+               yaffs_GrossUnlock(dev);
+               if (filldir(dirent, "..", 2, offset,
+                       f->f_dentry->d_parent->d_inode->i_ino, DT_DIR) < 0){
+                       yaffs_GrossLock(dev);
+                       goto out;
+               }
+               yaffs_GrossLock(dev);
+               offset++;
+               f->f_pos++;
+       }
+
+       curoffs = 1;
+
+       /* If the directory has changed since the open or last call to
+          readdir, rewind to after the 2 canned entries. */
+       if (f->f_version != inode->i_version) {
+               offset = 2;
+               f->f_pos = offset;
+               f->f_version = inode->i_version;
+       }
+
+       while(sc->nextReturn){
+               curoffs++;
+                l = sc->nextReturn;
+               if (curoffs >= offset) {
+                        int this_inode = yaffs_GetObjectInode(l);
+                        int this_type = yaffs_GetObjectType(l);
+
+                       yaffs_GetObjectName(l, name,
+                                           YAFFS_MAX_NAME_LENGTH + 1);
+                       T(YAFFS_TRACE_OS,
+                         (TSTR("yaffs_readdir: %s inode %d\n"),
+                         name, yaffs_GetObjectInode(l)));
+
+                        yaffs_GrossUnlock(dev);
+
+                       if (filldir(dirent,
+                                       name,
+                                       strlen(name),
+                                       offset,
+                                       this_inode,
+                                       this_type) < 0){
+                               yaffs_GrossLock(dev);
+                               goto out;
+                       }
+
+                        yaffs_GrossLock(dev);
+
+                       offset++;
+                       f->f_pos++;
+               }
+                yaffs_SearchAdvance(sc);
+       }
+
+out:
+       yaffs_EndSearch(sc);
+       yaffs_DeviceToLC(dev)->readdirProcess = NULL;
+       yaffs_GrossUnlock(dev);
+
+       return retVal;
+}
+
+
+
+/*
+ * File creation. Allocate an inode, and we're done..
+ */
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+#define YCRED(x) x
+#else
+#define YCRED(x) (x->cred)
+#endif
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+                       dev_t rdev)
+#else
+static int yaffs_mknod(struct inode *dir, struct dentry *dentry, int mode,
+                       int rdev)
+#endif
+{
+       struct inode *inode;
+
+       yaffs_Object *obj = NULL;
+       yaffs_Device *dev;
+
+       yaffs_Object *parent = yaffs_InodeToObject(dir);
+
+       int error = -ENOSPC;
+       uid_t uid = YCRED(current)->fsuid;
+       gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
+
+       if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
+               mode |= S_ISGID;
+
+       if (parent) {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod: parent object %d type %d\n"),
+                       parent->objectId, parent->variantType));
+       } else {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod: could not get parent object\n")));
+               return -EPERM;
+       }
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making oject for %s, "
+                       "mode %x dev %x\n"),
+                       dentry->d_name.name, mode, rdev));
+
+       dev = parent->myDev;
+
+       yaffs_GrossLock(dev);
+
+       switch (mode & S_IFMT) {
+       default:
+               /* Special (socket, fifo, device...) */
+               T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making special\n")));
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+               obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
+                               gid, old_encode_dev(rdev));
+#else
+               obj = yaffs_MknodSpecial(parent, dentry->d_name.name, mode, uid,
+                               gid, rdev);
+#endif
+               break;
+       case S_IFREG:           /* file          */
+               T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making file\n")));
+               obj = yaffs_MknodFile(parent, dentry->d_name.name, mode, uid,
+                               gid);
+               break;
+       case S_IFDIR:           /* directory */
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod: making directory\n")));
+               obj = yaffs_MknodDirectory(parent, dentry->d_name.name, mode,
+                                       uid, gid);
+               break;
+       case S_IFLNK:           /* symlink */
+               T(YAFFS_TRACE_OS, (TSTR("yaffs_mknod: making symlink\n")));
+               obj = NULL;     /* Do we ever get here? */
+               break;
+       }
+
+       /* Can not call yaffs_get_inode() with gross lock held */
+       yaffs_GrossUnlock(dev);
+
+       if (obj) {
+               inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
+               d_instantiate(dentry, inode);
+               update_dir_time(dir);
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod created object %d count = %d\n"),
+                       obj->objectId, atomic_read(&inode->i_count)));
+               error = 0;
+               yaffs_FillInodeFromObject(dir,parent);
+       } else {
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_mknod failed making object\n")));
+               error = -ENOMEM;
+       }
+
+       return error;
+}
+
+static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
+{
+       int retVal;
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_mkdir\n")));
+       retVal = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
+       return retVal;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode,
+                       struct nameidata *n)
+#else
+static int yaffs_create(struct inode *dir, struct dentry *dentry, int mode)
+#endif
+{
+       T(YAFFS_TRACE_OS,(TSTR("yaffs_create\n")));
+       return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
+}
+
+static int yaffs_unlink(struct inode *dir, struct dentry *dentry)
+{
+       int retVal;
+
+       yaffs_Device *dev;
+       yaffs_Object *obj;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_unlink %d:%s\n"),
+               (int)(dir->i_ino),
+               dentry->d_name.name));
+       obj = yaffs_InodeToObject(dir);
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       retVal = yaffs_Unlink(obj, dentry->d_name.name);
+
+       if (retVal == YAFFS_OK) {
+               dentry->d_inode->i_nlink--;
+               dir->i_version++;
+               yaffs_GrossUnlock(dev);
+               mark_inode_dirty(dentry->d_inode);
+               update_dir_time(dir);
+               return 0;
+       }
+       yaffs_GrossUnlock(dev);
+       return -ENOTEMPTY;
+}
+
+/*
+ * Create a link...
+ */
+static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
+                       struct dentry *dentry)
+{
+       struct inode *inode = old_dentry->d_inode;
+       yaffs_Object *obj = NULL;
+       yaffs_Object *link = NULL;
+       yaffs_Device *dev;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_link\n")));
+
+       obj = yaffs_InodeToObject(inode);
+       dev = obj->myDev;
+
+       yaffs_GrossLock(dev);
+
+       if (!S_ISDIR(inode->i_mode))            /* Don't link directories */
+               link = yaffs_Link(yaffs_InodeToObject(dir), dentry->d_name.name,
+                       obj);
+
+       if (link) {
+               old_dentry->d_inode->i_nlink = yaffs_GetObjectLinkCount(obj);
+               d_instantiate(dentry, old_dentry->d_inode);
+               atomic_inc(&old_dentry->d_inode->i_count);
+               T(YAFFS_TRACE_OS,
+                       (TSTR("yaffs_link link count %d i_count %d\n"),
+                       old_dentry->d_inode->i_nlink,
+                       atomic_read(&old_dentry->d_inode->i_count)));
+       }
+
+       yaffs_GrossUnlock(dev);
+
+       if (link){
+               update_dir_time(dir);
+               return 0;
+       }
+
+       return -EPERM;
+}
+
+static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
+                               const char *symname)
+{
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+       uid_t uid = YCRED(current)->fsuid;
+       gid_t gid = (dir->i_mode & S_ISGID) ? dir->i_gid : YCRED(current)->fsgid;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_symlink\n")));
+
+       dev = yaffs_InodeToObject(dir)->myDev;
+       yaffs_GrossLock(dev);
+       obj = yaffs_MknodSymLink(yaffs_InodeToObject(dir), dentry->d_name.name,
+                               S_IFLNK | S_IRWXUGO, uid, gid, symname);
+       yaffs_GrossUnlock(dev);
+
+       if (obj) {
+               struct inode *inode;
+
+               inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
+               d_instantiate(dentry, inode);
+               update_dir_time(dir);
+               T(YAFFS_TRACE_OS, (TSTR("symlink created OK\n")));
+               return 0;
+       } else {
+               T(YAFFS_TRACE_OS, (TSTR("symlink not created\n")));
+       }
+
+       return -ENOMEM;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+static int yaffs_sync_object(struct file *file, int datasync)
+#else
+static int yaffs_sync_object(struct file *file, struct dentry *dentry,
+                               int datasync)
+#endif
+{
+
+       yaffs_Object *obj;
+       yaffs_Device *dev;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
+       struct dentry *dentry = file->f_path.dentry;
+#endif
+
+       obj = yaffs_DentryToObject(dentry);
+
+       dev = obj->myDev;
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+               (TSTR("yaffs_sync_object\n")));
+       yaffs_GrossLock(dev);
+       yaffs_FlushFile(obj, 1, datasync);
+       yaffs_GrossUnlock(dev);
+       return 0;
+}
+
+/*
+ * The VFS layer already does all the dentry stuff for rename.
+ *
+ * NB: POSIX says you can rename an object over an old object of the same name
+ */
+static int yaffs_rename(struct inode *old_dir, struct dentry *old_dentry,
+                       struct inode *new_dir, struct dentry *new_dentry)
+{
+       yaffs_Device *dev;
+       int retVal = YAFFS_FAIL;
+       yaffs_Object *target;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_rename\n")));
+       dev = yaffs_InodeToObject(old_dir)->myDev;
+
+       yaffs_GrossLock(dev);
+
+       /* Check if the target is an existing directory that is not empty. */
+       target = yaffs_FindObjectByName(yaffs_InodeToObject(new_dir),
+                               new_dentry->d_name.name);
+
+
+
+       if (target && target->variantType == YAFFS_OBJECT_TYPE_DIRECTORY &&
+               !ylist_empty(&target->variant.directoryVariant.children)) {
+
+               T(YAFFS_TRACE_OS, (TSTR("target is non-empty dir\n")));
+
+               retVal = YAFFS_FAIL;
+       } else {
+               /* Now does unlinking internally using shadowing mechanism */
+               T(YAFFS_TRACE_OS, (TSTR("calling yaffs_RenameObject\n")));
+
+               retVal = yaffs_RenameObject(yaffs_InodeToObject(old_dir),
+                               old_dentry->d_name.name,
+                               yaffs_InodeToObject(new_dir),
+                               new_dentry->d_name.name);
+       }
+       yaffs_GrossUnlock(dev);
+
+       if (retVal == YAFFS_OK) {
+               if (target) {
+                       new_dentry->d_inode->i_nlink--;
+                       mark_inode_dirty(new_dentry->d_inode);
+               }
+               
+               update_dir_time(old_dir);
+               if(old_dir != new_dir)
+                       update_dir_time(new_dir);
+               return 0;
+       } else {
+               return -ENOTEMPTY;
+       }
+}
+
+static int yaffs_setattr(struct dentry *dentry, struct iattr *attr)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setattr of object %d\n"),
+               yaffs_InodeToObject(inode)->objectId));
+
+       /* Fail if a requested resize >= 2GB */         
+       if (attr->ia_valid & ATTR_SIZE &&
+               (attr->ia_size >> 31))
+               error = -EINVAL;
+
+       if (error == 0)
+               error = inode_change_ok(inode, attr);
+       if (error == 0) {
+               int result;
+               if (!error){
+                       error = yaffs_vfs_setattr(inode, attr);
+                       T(YAFFS_TRACE_OS,(TSTR("inode_setattr called\n")));
+                       if (attr->ia_valid & ATTR_SIZE){
+                               yaffs_vfs_setsize(inode,attr->ia_size);
+                               inode->i_blocks = (inode->i_size + 511) >> 9;
+                       }
+               }
+               dev = yaffs_InodeToObject(inode)->myDev;
+               if (attr->ia_valid & ATTR_SIZE){
+                       T(YAFFS_TRACE_OS,(TSTR("resize to %d(%x)\n"),
+                               (int)(attr->ia_size),(int)(attr->ia_size)));
+               }
+               yaffs_GrossLock(dev);
+               result = yaffs_SetAttributes(yaffs_InodeToObject(inode), attr);
+               if(result == YAFFS_OK) {
+                       error = 0;
+               } else {
+                       error = -EPERM;
+               }
+               yaffs_GrossUnlock(dev);
+
+       }
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setattr done returning %d\n"),error));
+
+       return error;
+}
+
+#ifdef CONFIG_YAFFS_XATTR
+int yaffs_setxattr(struct dentry *dentry, const char *name,
+                       const void *value, size_t size, int flags)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setxattr of object %d\n"),
+               obj->objectId));
+
+
+       if (error == 0) {
+               int result;
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               result = yaffs_SetXAttribute(obj, name, value, size, flags);
+               if(result == YAFFS_OK)
+                       error = 0;
+               else if(result < 0)
+                       error = result;
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_setxattr done returning %d\n"),error));
+
+       return error;
+}
+
+
+ssize_t yaffs_getxattr(struct dentry *dentry, const char *name, void *buff,
+                       size_t size)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_getxattr \"%s\" from object %d\n"),
+               name, obj->objectId));
+
+       if (error == 0) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               error = yaffs_GetXAttribute(obj, name, buff, size);
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_getxattr done returning %d\n"),error));
+
+       return error;
+}
+
+int yaffs_removexattr(struct dentry *dentry, const char *name)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_removexattr of object %d\n"),
+               obj->objectId));
+
+
+       if (error == 0) {
+               int result;
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               result = yaffs_RemoveXAttribute(obj, name);
+               if(result == YAFFS_OK)
+                       error = 0;
+               else if(result < 0)
+                       error = result;
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_removexattr done returning %d\n"),error));
+
+       return error;
+}
+
+ssize_t yaffs_listxattr(struct dentry *dentry, char *buff, size_t size)
+{
+       struct inode *inode = dentry->d_inode;
+       int error = 0;
+       yaffs_Device *dev;
+       yaffs_Object *obj = yaffs_InodeToObject(inode);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_listxattr of object %d\n"),
+               obj->objectId));
+
+
+       if (error == 0) {
+               dev = obj->myDev;
+               yaffs_GrossLock(dev);
+               error = yaffs_ListXAttributes(obj, buff, size);
+               yaffs_GrossUnlock(dev);
+
+       }
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_listxattr done returning %d\n"),error));
+
+       return error;
+}
+
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+       yaffs_Device *dev = yaffs_DentryToObject(dentry)->myDev;
+       struct super_block *sb = dentry->d_sb;
+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_statfs(struct super_block *sb, struct kstatfs *buf)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+#else
+static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+#endif
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_statfs\n")));
+
+       yaffs_GrossLock(dev);
+
+       buf->f_type = YAFFS_MAGIC;
+       buf->f_bsize = sb->s_blocksize;
+       buf->f_namelen = 255;
+
+       if (dev->nDataBytesPerChunk & (dev->nDataBytesPerChunk - 1)) {
+               /* Do this if chunk size is not a power of 2 */
+
+               uint64_t bytesInDev;
+               uint64_t bytesFree;
+
+               bytesInDev = ((uint64_t)((dev->param.endBlock - dev->param.startBlock + 1))) *
+                       ((uint64_t)(dev->param.nChunksPerBlock * dev->nDataBytesPerChunk));
+
+               do_div(bytesInDev, sb->s_blocksize); /* bytesInDev becomes the number of blocks */
+               buf->f_blocks = bytesInDev;
+
+               bytesFree  = ((uint64_t)(yaffs_GetNumberOfFreeChunks(dev))) *
+                       ((uint64_t)(dev->nDataBytesPerChunk));
+
+               do_div(bytesFree, sb->s_blocksize);
+
+               buf->f_bfree = bytesFree;
+
+       } else if (sb->s_blocksize > dev->nDataBytesPerChunk) {
+
+               buf->f_blocks =
+                       (dev->param.endBlock - dev->param.startBlock + 1) *
+                       dev->param.nChunksPerBlock /
+                       (sb->s_blocksize / dev->nDataBytesPerChunk);
+               buf->f_bfree =
+                       yaffs_GetNumberOfFreeChunks(dev) /
+                       (sb->s_blocksize / dev->nDataBytesPerChunk);
+       } else {
+               buf->f_blocks =
+                       (dev->param.endBlock - dev->param.startBlock + 1) *
+                       dev->param.nChunksPerBlock *
+                       (dev->nDataBytesPerChunk / sb->s_blocksize);
+
+               buf->f_bfree =
+                       yaffs_GetNumberOfFreeChunks(dev) *
+                       (dev->nDataBytesPerChunk / sb->s_blocksize);
+       }
+
+       buf->f_files = 0;
+       buf->f_ffree = 0;
+       buf->f_bavail = buf->f_bfree;
+
+       yaffs_GrossUnlock(dev);
+       return 0;
+}
+
+
+
+static void yaffs_FlushInodes(struct super_block *sb)
+{
+       struct inode *iptr;
+       yaffs_Object *obj;
+       
+       list_for_each_entry(iptr,&sb->s_inodes, i_sb_list){
+               obj = yaffs_InodeToObject(iptr);
+               if(obj){
+                       T(YAFFS_TRACE_OS, (TSTR("flushing obj %d\n"),
+                               obj->objectId));
+                       yaffs_FlushFile(obj,1,0);
+               }
+       }
+}
+
+
+static void yaffs_FlushSuperBlock(struct super_block *sb, int do_checkpoint)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);    
+       if(!dev)
+               return;
+       
+       yaffs_FlushInodes(sb);
+       yaffs_UpdateDirtyDirectories(dev);
+       yaffs_FlushEntireDeviceCache(dev);
+       if(do_checkpoint)
+               yaffs_CheckpointSave(dev);
+}
+
+
+static unsigned yaffs_bg_gc_urgency(yaffs_Device *dev)
+{
+       unsigned erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+       struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+       unsigned scatteredFree = 0; /* Free chunks not in an erased block */
+
+       if(erasedChunks < dev->nFreeChunks)
+               scatteredFree = (dev->nFreeChunks - erasedChunks);
+
+       if(!context->bgRunning)
+               return 0;
+       else if(scatteredFree < (dev->param.nChunksPerBlock * 2))
+               return 0;
+       else if(erasedChunks > dev->nFreeChunks/2)
+               return 0;
+       else if(erasedChunks > dev->nFreeChunks/4)
+               return 1;
+       else
+               return 2;
+}
+
+static int yaffs_do_sync_fs(struct super_block *sb,
+                               int request_checkpoint)
+{
+
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+       unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
+       unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
+       int do_checkpoint;
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs_do_sync_fs: gc-urgency %d %s %s%s\n"),
+               gc_urgent,
+               sb->s_dirt ? "dirty" : "clean",
+               request_checkpoint ? "checkpoint requested" : "no checkpoint",
+               oneshot_checkpoint ? " one-shot" : "" ));
+
+       yaffs_GrossLock(dev);
+       do_checkpoint = ((request_checkpoint && !gc_urgent) ||
+                       oneshot_checkpoint) &&
+                       !dev->isCheckpointed;
+
+       if (sb->s_dirt || do_checkpoint) {
+               yaffs_FlushSuperBlock(sb, !dev->isCheckpointed && do_checkpoint);
+               sb->s_dirt = 0;
+               if(oneshot_checkpoint)
+                       yaffs_auto_checkpoint &= ~4;
+       }
+       yaffs_GrossUnlock(dev);
+
+       return 0;
+}
+
+/*
+ * yaffs background thread functions .
+ * yaffs_BackgroundThread() the thread function
+ * yaffs_BackgroundStart() launches the background thread.
+ * yaffs_BackgroundStop() cleans up the background thread.
+ *
+ * NB: 
+ * The thread should only run after the yaffs is initialised
+ * The thread should be stopped before yaffs is unmounted.
+ * The thread should not do any writing while the fs is in read only.
+ */
+
+#ifdef YAFFS_COMPILE_BACKGROUND
+
+void yaffs_background_waker(unsigned long data)
+{
+       wake_up_process((struct task_struct *)data);
+}
+
+static int yaffs_BackgroundThread(void *data)
+{
+       yaffs_Device *dev = (yaffs_Device *)data;
+       struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+       unsigned long now = jiffies;
+       unsigned long next_dir_update = now;
+       unsigned long next_gc = now;
+       unsigned long expires;
+       unsigned int urgency;
+
+       int gcResult;
+       struct timer_list timer;
+
+       T(YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs_background starting for dev %p\n"),
+               (void *)dev));
+
+#ifdef YAFFS_COMPILE_FREEZER
+       set_freezable();
+#endif
+       while(context->bgRunning){
+               T(YAFFS_TRACE_BACKGROUND,
+                       (TSTR("yaffs_background\n")));
+
+               if(kthread_should_stop())
+                       break;
+
+#ifdef YAFFS_COMPILE_FREEZER
+               if(try_to_freeze())
+                       continue;
+#endif
+               yaffs_GrossLock(dev);
+
+               now = jiffies;
+
+               if(time_after(now, next_dir_update) && yaffs_bg_enable){
+                       yaffs_UpdateDirtyDirectories(dev);
+                       next_dir_update = now + HZ;
+               }
+
+               if(time_after(now,next_gc) && yaffs_bg_enable){
+                       if(!dev->isCheckpointed){
+                               urgency = yaffs_bg_gc_urgency(dev);
+                               gcResult = yaffs_BackgroundGarbageCollect(dev, urgency);
+                               if(urgency > 1)
+                                       next_gc = now + HZ/20+1;
+                               else if(urgency > 0)
+                                       next_gc = now + HZ/10+1;
+                               else
+                                       next_gc = now + HZ * 2;
+                       } else /*
+                               * gc not running so set to next_dir_update
+                               * to cut down on wake ups
+                               */
+                               next_gc = next_dir_update;
+               }
+               yaffs_GrossUnlock(dev);
+#if 1
+               expires = next_dir_update;
+               if (time_before(next_gc,expires))
+                       expires = next_gc;
+               if(time_before(expires,now))
+                       expires = now + HZ;
+
+               Y_INIT_TIMER(&timer);
+               timer.expires = expires+1;
+               timer.data = (unsigned long) current;
+               timer.function = yaffs_background_waker;
+
+                set_current_state(TASK_INTERRUPTIBLE);
+               add_timer(&timer);
+               schedule();
+               del_timer_sync(&timer);
+#else
+               msleep(10);
+#endif
+       }
+
+       return 0;
+}
+
+static int yaffs_BackgroundStart(yaffs_Device *dev)
+{
+       int retval = 0;
+       struct yaffs_LinuxContext *context = yaffs_DeviceToLC(dev);
+
+       if(dev->readOnly)
+               return -1;
+
+       context->bgRunning = 1;
+
+       context->bgThread = kthread_run(yaffs_BackgroundThread,
+                               (void *)dev,"yaffs-bg-%d",context->mount_id);
+
+       if(IS_ERR(context->bgThread)){
+               retval = PTR_ERR(context->bgThread);
+               context->bgThread = NULL;
+               context->bgRunning = 0;
+       }
+       return retval;
+}
+
+static void yaffs_BackgroundStop(yaffs_Device *dev)
+{
+       struct yaffs_LinuxContext *ctxt = yaffs_DeviceToLC(dev);
+
+       ctxt->bgRunning = 0;
+
+       if( ctxt->bgThread){
+               kthread_stop(ctxt->bgThread);
+               ctxt->bgThread = NULL;
+       }
+}
+#else
+static int yaffs_BackgroundThread(void *data)
+{
+       return 0;
+}
+
+static int yaffs_BackgroundStart(yaffs_Device *dev)
+{
+       return 0;
+}
+
+static void yaffs_BackgroundStop(yaffs_Device *dev)
+{
+}
+#endif
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static void yaffs_write_super(struct super_block *sb)
+#else
+static int yaffs_write_super(struct super_block *sb)
+#endif
+{
+       unsigned request_checkpoint = (yaffs_auto_checkpoint >= 2);
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs_write_super%s\n"),
+               request_checkpoint ? " checkpt" : ""));
+
+       yaffs_do_sync_fs(sb, request_checkpoint);
+
+#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
+       return 0;
+#endif
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_sync_fs(struct super_block *sb, int wait)
+#else
+static int yaffs_sync_fs(struct super_block *sb)
+#endif
+{
+       unsigned request_checkpoint = (yaffs_auto_checkpoint >= 1);
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
+               (TSTR("yaffs_sync_fs%s\n"),
+               request_checkpoint ? " checkpt" : ""));
+
+       yaffs_do_sync_fs(sb, request_checkpoint);
+
+       return 0;
+}
+
+#ifdef YAFFS_USE_OWN_IGET
+
+static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
+{
+       struct inode *inode;
+       yaffs_Object *obj;
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_iget for %lu\n"), ino));
+
+       inode = iget_locked(sb, ino);
+       if (!inode)
+               return ERR_PTR(-ENOMEM);
+       if (!(inode->i_state & I_NEW))
+               return inode;
+
+       /* NB This is called as a side effect of other functions, but
+        * we had to release the lock to prevent deadlocks, so
+        * need to lock again.
+        */
+
+       yaffs_GrossLock(dev);
+
+       obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
+
+       yaffs_FillInodeFromObject(inode, obj);
+
+       yaffs_GrossUnlock(dev);
+
+       unlock_new_inode(inode);
+       return inode;
+}
+
+#else
+
+static void yaffs_read_inode(struct inode *inode)
+{
+       /* NB This is called as a side effect of other functions, but
+        * we had to release the lock to prevent deadlocks, so
+        * need to lock again.
+        */
+
+       yaffs_Object *obj;
+       yaffs_Device *dev = yaffs_SuperToDevice(inode->i_sb);
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_read_inode for %d\n"), (int)inode->i_ino));
+
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossLock(dev);
+
+       obj = yaffs_FindObjectByNumber(dev, inode->i_ino);
+
+       yaffs_FillInodeFromObject(inode, obj);
+
+       if(current != yaffs_DeviceToLC(dev)->readdirProcess)
+               yaffs_GrossUnlock(dev);
+}
+
+#endif
+
+static YLIST_HEAD(yaffs_context_list);
+struct semaphore yaffs_context_lock;
+
+static void yaffs_put_super(struct super_block *sb)
+{
+       yaffs_Device *dev = yaffs_SuperToDevice(sb);
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_put_super\n")));
+
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+               (TSTR("Shutting down yaffs background thread\n")));
+       yaffs_BackgroundStop(dev);
+       T(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
+               (TSTR("yaffs background thread shut down\n")));
+
+       yaffs_GrossLock(dev);
+
+       yaffs_FlushSuperBlock(sb,1);
+
+       if (yaffs_DeviceToLC(dev)->putSuperFunc)
+               yaffs_DeviceToLC(dev)->putSuperFunc(sb);
+
+
+       yaffs_Deinitialise(dev);
+
+       yaffs_GrossUnlock(dev);
+
+       down(&yaffs_context_lock);
+       ylist_del_init(&(yaffs_DeviceToLC(dev)->contextList));
+       up(&yaffs_context_lock);
+
+       if (yaffs_DeviceToLC(dev)->spareBuffer) {
+               YFREE(yaffs_DeviceToLC(dev)->spareBuffer);
+               yaffs_DeviceToLC(dev)->spareBuffer = NULL;
+       }
+
+       kfree(dev);
+}
+
+
+static void yaffs_MTDPutSuper(struct super_block *sb)
+{
+       struct mtd_info *mtd = yaffs_DeviceToMtd(yaffs_SuperToDevice(sb));
+
+       if (mtd->sync)
+               mtd->sync(mtd);
+
+       put_mtd_device(mtd);
+}
+
+
+static void yaffs_MarkSuperBlockDirty(yaffs_Device *dev)
+{
+       struct super_block *sb = yaffs_DeviceToLC(dev)->superBlock;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_MarkSuperBlockDirty() sb = %p\n"), sb));
+       if (sb)
+               sb->s_dirt = 1;
+}
+
+typedef struct {
+       int inband_tags;
+       int skip_checkpoint_read;
+       int skip_checkpoint_write;
+       int no_cache;
+       int tags_ecc_on;
+       int tags_ecc_overridden;
+       int lazy_loading_enabled;
+       int lazy_loading_overridden;
+       int empty_lost_and_found;
+       int empty_lost_and_found_overridden;
+} yaffs_options;
+
+#define MAX_OPT_LEN 30
+static int yaffs_parse_options(yaffs_options *options, const char *options_str)
+{
+       char cur_opt[MAX_OPT_LEN + 1];
+       int p;
+       int error = 0;
+
+       /* Parse through the options which is a comma seperated list */
+
+       while (options_str && *options_str && !error) {
+               memset(cur_opt, 0, MAX_OPT_LEN + 1);
+               p = 0;
+
+               while(*options_str == ',')
+                       options_str++;
+
+               while (*options_str && *options_str != ',') {
+                       if (p < MAX_OPT_LEN) {
+                               cur_opt[p] = *options_str;
+                               p++;
+                       }
+                       options_str++;
+               }
+
+               if (!strcmp(cur_opt, "inband-tags"))
+                       options->inband_tags = 1;
+               else if (!strcmp(cur_opt, "tags-ecc-off")){
+                       options->tags_ecc_on = 0;
+                       options->tags_ecc_overridden=1;
+               } else if (!strcmp(cur_opt, "tags-ecc-on")){
+                       options->tags_ecc_on = 1;
+                       options->tags_ecc_overridden = 1;
+               } else if (!strcmp(cur_opt, "lazy-loading-off")){
+                       options->lazy_loading_enabled = 0;
+                       options->lazy_loading_overridden=1;
+               } else if (!strcmp(cur_opt, "lazy-loading-on")){
+                       options->lazy_loading_enabled = 1;
+                       options->lazy_loading_overridden = 1;
+               } else if (!strcmp(cur_opt, "empty-lost-and-found-off")){
+                       options->empty_lost_and_found = 0;
+                       options->empty_lost_and_found_overridden=1;
+               } else if (!strcmp(cur_opt, "empty-lost-and-found-on")){
+                       options->empty_lost_and_found = 1;
+                       options->empty_lost_and_found_overridden=1;
+               } else if (!strcmp(cur_opt, "no-cache"))
+                       options->no_cache = 1;
+               else if (!strcmp(cur_opt, "no-checkpoint-read"))
+                       options->skip_checkpoint_read = 1;
+               else if (!strcmp(cur_opt, "no-checkpoint-write"))
+                       options->skip_checkpoint_write = 1;
+               else if (!strcmp(cur_opt, "no-checkpoint")) {
+                       options->skip_checkpoint_read = 1;
+                       options->skip_checkpoint_write = 1;
+               } else {
+                       printk(KERN_INFO "yaffs: Bad mount option \"%s\"\n",
+                                       cur_opt);
+                       error = 1;
+               }
+       }
+
+       return error;
+}
+
+static struct super_block *yaffs_internal_read_super(int yaffsVersion,
+                                               struct super_block *sb,
+                                               void *data, int silent)
+{
+       int nBlocks;
+       struct inode *inode = NULL;
+       struct dentry *root;
+       yaffs_Device *dev = 0;
+       char devname_buf[BDEVNAME_SIZE + 1];
+       struct mtd_info *mtd;
+       int err;
+       char *data_str = (char *)data;
+       struct yaffs_LinuxContext *context = NULL;
+       yaffs_DeviceParam *param;
+
+       int readOnly = 0;
+
+       yaffs_options options;
+
+       unsigned mount_id;
+       int found;
+       struct yaffs_LinuxContext *context_iterator;
+       struct ylist_head *l;
+
+       sb->s_magic = YAFFS_MAGIC;
+       sb->s_op = &yaffs_super_ops;
+       sb->s_flags |= MS_NOATIME;
+
+       readOnly =((sb->s_flags & MS_RDONLY) != 0);
+
+
+#ifdef YAFFS_COMPILE_EXPORTFS
+       sb->s_export_op = &yaffs_export_ops;
+#endif
+
+       if (!sb)
+               printk(KERN_INFO "yaffs: sb is NULL\n");
+       else if (!sb->s_dev)
+               printk(KERN_INFO "yaffs: sb->s_dev is NULL\n");
+       else if (!yaffs_devname(sb, devname_buf))
+               printk(KERN_INFO "yaffs: devname is NULL\n");
+       else
+               printk(KERN_INFO "yaffs: dev is %d name is \"%s\" %s\n",
+                      sb->s_dev,
+                      yaffs_devname(sb, devname_buf),
+                      readOnly ? "ro" : "rw");
+
+       if (!data_str)
+               data_str = "";
+
+       printk(KERN_INFO "yaffs: passed flags \"%s\"\n", data_str);
+
+       memset(&options, 0, sizeof(options));
+
+       if (yaffs_parse_options(&options, data_str)) {
+               /* Option parsing failed */
+               return NULL;
+       }
+
+
+       sb->s_blocksize = PAGE_CACHE_SIZE;
+       sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
+
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_read_super: Using yaffs%d\n"), yaffsVersion));
+       T(YAFFS_TRACE_OS,
+               (TSTR("yaffs_read_super: block size %d\n"),
+               (int)(sb->s_blocksize)));
+
+       T(YAFFS_TRACE_ALWAYS,
+               (TSTR("yaffs: Attempting MTD mount of %u.%u,\"%s\"\n"),
+              MAJOR(sb->s_dev), MINOR(sb->s_dev),
+              yaffs_devname(sb, devname_buf)));
+
+       /* Check it's an mtd device..... */
+       if (MAJOR(sb->s_dev) != MTD_BLOCK_MAJOR)
+               return NULL;    /* This isn't an mtd device */
+
+       /* Get the device */
+       mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
+       if (!mtd) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: MTD device #%u doesn't appear to exist\n"),
+                       MINOR(sb->s_dev)));
+               return NULL;
+       }
+       /* Check it's NAND */
+       if (mtd->type != MTD_NANDFLASH) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: MTD device is not NAND it's type %d\n"),
+                       mtd->type));
+               return NULL;
+       }
+
+       T(YAFFS_TRACE_OS, (TSTR(" erase %p\n"), mtd->erase));
+       T(YAFFS_TRACE_OS, (TSTR(" read %p\n"), mtd->read));
+       T(YAFFS_TRACE_OS, (TSTR(" write %p\n"), mtd->write));
+       T(YAFFS_TRACE_OS, (TSTR(" readoob %p\n"), mtd->read_oob));
+       T(YAFFS_TRACE_OS, (TSTR(" writeoob %p\n"), mtd->write_oob));
+       T(YAFFS_TRACE_OS, (TSTR(" block_isbad %p\n"), mtd->block_isbad));
+       T(YAFFS_TRACE_OS, (TSTR(" block_markbad %p\n"), mtd->block_markbad));
+       T(YAFFS_TRACE_OS, (TSTR(" %s %d\n"), WRITE_SIZE_STR, WRITE_SIZE(mtd)));
+       T(YAFFS_TRACE_OS, (TSTR(" oobsize %d\n"), mtd->oobsize));
+       T(YAFFS_TRACE_OS, (TSTR(" erasesize %d\n"), mtd->erasesize));
+#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
+       T(YAFFS_TRACE_OS, (TSTR(" size %u\n"), mtd->size));
+#else
+       T(YAFFS_TRACE_OS, (TSTR(" size %lld\n"), mtd->size));
+#endif
+
+#ifdef CONFIG_YAFFS_AUTO_YAFFS2
+
+       if (yaffsVersion == 1 && WRITE_SIZE(mtd) >= 2048) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: auto selecting yaffs2\n")));
+               yaffsVersion = 2;
+       }
+
+       /* Added NCB 26/5/2006 for completeness */
+       if (yaffsVersion == 2 && !options.inband_tags && WRITE_SIZE(mtd) == 512) {
+               T(YAFFS_TRACE_ALWAYS,
+                       (TSTR("yaffs: auto selecting yaffs1\n")));
+               yaffsVersion = 1;
+       }
+
+#endif
+
+       if (yaffsVersion == 2) {
+               /* Check for version 2 style functions */
+               if (!mtd->erase ||
+                   !mtd->block_isbad ||
+                   !mtd->block_markbad ||
+                   !mtd->read ||
+                   !mtd->write ||
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+                   !mtd->read_oob || !mtd->write_oob) {
+#else
+                   !mtd->write_ecc ||
+                   !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
+#endif
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not support required "
+                          "functions\n")));
+                       return NULL;
+               }
+
+               if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
+                   mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
+                   !options.inband_tags) {
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not have the "
+                          "right page sizes\n")));
+                       return NULL;
+               }
+       } else {
+               /* Check for V1 style functions */
+               if (!mtd->erase ||
+                   !mtd->read ||
+                   !mtd->write ||
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+                   !mtd->read_oob || !mtd->write_oob) {
+#else
+                   !mtd->write_ecc ||
+                   !mtd->read_ecc || !mtd->read_oob || !mtd->write_oob) {
+#endif
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not support required "
+                          "functions\n")));
+                       return NULL;
+               }
+
+               if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
+                   mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
+                       T(YAFFS_TRACE_ALWAYS,
+                         (TSTR("yaffs: MTD device does not support have the "
+                          "right page sizes\n")));
+                       return NULL;
+               }
+       }
+
+       /* OK, so if we got here, we have an MTD that's NAND and looks
+        * like it has the right capabilities
+        * Set the yaffs_Device up for mtd
+        */
+
+       if (!readOnly && !(mtd->flags & MTD_WRITEABLE)){
+               readOnly = 1;
+               printk(KERN_INFO "yaffs: mtd is read only, setting superblock read only");
+               sb->s_flags |= MS_RDONLY;
+       }
+
+       dev = kmalloc(sizeof(yaffs_Device), GFP_KERNEL);
+       context = kmalloc(sizeof(struct yaffs_LinuxContext),GFP_KERNEL);
+       
+       if(!dev || !context ){
+               if(dev)
+                       kfree(dev);
+               if(context)
+                       kfree(context);
+               dev = NULL;
+               context = NULL;
+       }
+
+       if (!dev) {
+               /* Deep shit could not allocate device structure */
+               T(YAFFS_TRACE_ALWAYS,
+                 (TSTR("yaffs_read_super: Failed trying to allocate "
+                  "yaffs_Device. \n")));
+               return NULL;
+       }
+       memset(dev, 0, sizeof(yaffs_Device));
+       param = &(dev->param);
+
+       memset(context,0,sizeof(struct yaffs_LinuxContext));
+       dev->osContext = context;
+       YINIT_LIST_HEAD(&(context->contextList));
+       context->dev = dev;
+       context->superBlock = sb;
+
+       dev->readOnly = readOnly;
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+       sb->s_fs_info = dev;
+#else
+       sb->u.generic_sbp = dev;
+#endif
+       
+       dev->driverContext = mtd;
+       param->name = mtd->name;
+
+       /* Set up the memory size parameters.... */
+
+       nBlocks = YCALCBLOCKS(mtd->size, (YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK));
+
+       param->startBlock = 0;
+       param->endBlock = nBlocks - 1;
+       param->nChunksPerBlock = YAFFS_CHUNKS_PER_BLOCK;
+       param->totalBytesPerChunk = YAFFS_BYTES_PER_CHUNK;
+       param->nReservedBlocks = 5;
+       param->nShortOpCaches = (options.no_cache) ? 0 : 10;
+       param->inbandTags = options.inband_tags;
+
+#ifdef CONFIG_YAFFS_DISABLE_LAZY_LOAD
+       param->disableLazyLoad = 1;
+#endif
+#ifdef CONFIG_YAFFS_XATTR
+       param->enableXattr = 1;
+#endif
+       if(options.lazy_loading_overridden)
+               param->disableLazyLoad = !options.lazy_loading_enabled;
+
+#ifdef CONFIG_YAFFS_DISABLE_TAGS_ECC
+       param->noTagsECC = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BACKGROUND
+#else
+       param->deferDirectoryUpdate = 1;
+#endif
+
+       if(options.tags_ecc_overridden)
+               param->noTagsECC = !options.tags_ecc_on;
+
+#ifdef CONFIG_YAFFS_EMPTY_LOST_AND_FOUND
+       param->emptyLostAndFound = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_BLOCK_REFRESHING
+       param->refreshPeriod = 0;
+#else
+       param->refreshPeriod = 500;
+#endif
+
+#ifdef CONFIG_YAFFS__ALWAYS_CHECK_CHUNK_ERASED
+       param->alwaysCheckErased = 1;
+#endif
+
+       if(options.empty_lost_and_found_overridden)
+               param->emptyLostAndFound = options.empty_lost_and_found;
+
+       /* ... and the functions. */
+       if (yaffsVersion == 2) {
+               param->writeChunkWithTagsToNAND =
+                   nandmtd2_WriteChunkWithTagsToNAND;
+               param->readChunkWithTagsFromNAND =
+                   nandmtd2_ReadChunkWithTagsFromNAND;
+               param->markNANDBlockBad = nandmtd2_MarkNANDBlockBad;
+               param->queryNANDBlock = nandmtd2_QueryNANDBlock;
+               yaffs_DeviceToLC(dev)->spareBuffer = YMALLOC(mtd->oobsize);
+               param->isYaffs2 = 1;
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+               param->totalBytesPerChunk = mtd->writesize;
+               param->nChunksPerBlock = mtd->erasesize / mtd->writesize;
+#else
+               param->totalBytesPerChunk = mtd->oobblock;
+               param->nChunksPerBlock = mtd->erasesize / mtd->oobblock;
+#endif
+               nBlocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
+
+               param->startBlock = 0;
+               param->endBlock = nBlocks - 1;
+       } else {
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+               /* use the MTD interface in yaffs_mtdif1.c */
+               param->writeChunkWithTagsToNAND =
+                       nandmtd1_WriteChunkWithTagsToNAND;
+               param->readChunkWithTagsFromNAND =
+                       nandmtd1_ReadChunkWithTagsFromNAND;
+               param->markNANDBlockBad = nandmtd1_MarkNANDBlockBad;
+               param->queryNANDBlock = nandmtd1_QueryNANDBlock;
+#else
+               param->writeChunkToNAND = nandmtd_WriteChunkToNAND;
+               param->readChunkFromNAND = nandmtd_ReadChunkFromNAND;
+#endif
+               param->isYaffs2 = 0;
+       }
+       /* ... and common functions */
+       param->eraseBlockInNAND = nandmtd_EraseBlockInNAND;
+       param->initialiseNAND = nandmtd_InitialiseNAND;
+
+       yaffs_DeviceToLC(dev)->putSuperFunc = yaffs_MTDPutSuper;
+
+       param->markSuperBlockDirty = yaffs_MarkSuperBlockDirty;
+       param->gcControl = yaffs_gc_control_callback;
+
+       yaffs_DeviceToLC(dev)->superBlock= sb;
+       
+
+#ifndef CONFIG_YAFFS_DOES_ECC
+       param->useNANDECC = 1;
+#endif
+
+#ifdef CONFIG_YAFFS_DISABLE_WIDE_TNODES
+       param->wideTnodesDisabled = 1;
+#endif
+
+       param->skipCheckpointRead = options.skip_checkpoint_read;
+       param->skipCheckpointWrite = options.skip_checkpoint_write;
+
+       down(&yaffs_context_lock);
+       /* Get a mount id */
+       found = 0;
+       for(mount_id=0; ! found; mount_id++){
+               found = 1;
+               ylist_for_each(l,&yaffs_context_list){
+                       context_iterator = ylist_entry(l,struct yaffs_LinuxContext,contextList);
+                       if(context_iterator->mount_id == mount_id)
+                               found = 0;
+               }
+       }
+       context->mount_id = mount_id;
+
+       ylist_add_tail(&(yaffs_DeviceToLC(dev)->contextList), &yaffs_context_list);
+       up(&yaffs_context_lock);
+
+        /* Directory search handling...*/
+        YINIT_LIST_HEAD(&(yaffs_DeviceToLC(dev)->searchContexts));
+        param->removeObjectCallback = yaffs_RemoveObjectCallback;
+
+       init_MUTEX(&(yaffs_DeviceToLC(dev)->grossLock));
+
+       yaffs_GrossLock(dev);
+
+       err = yaffs_GutsInitialise(dev);
+
+       T(YAFFS_TRACE_OS,
+         (TSTR("yaffs_read_super: guts initialised %s\n"),
+          (err == YAFFS_OK) ? "OK" : "FAILED"));
+          
+       if(err == YAFFS_OK)
+               yaffs_BackgroundStart(dev);
+               
+       if(!context->bgThread)
+               param->deferDirectoryUpdate = 0;
+
+
+       /* Release lock before yaffs_get_inode() */
+       yaffs_GrossUnlock(dev);
+
+       /* Create root inode */
+       if (err == YAFFS_OK)
+               inode = yaffs_get_inode(sb, S_IFDIR | 0755, 0,
+                                       yaffs_Root(dev));
+
+       if (!inode)
+               return NULL;
+
+       inode->i_op = &yaffs_dir_inode_operations;
+       inode->i_fop = &yaffs_dir_operations;
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: got root inode\n")));
+
+       root = d_alloc_root(inode);
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: d_alloc_root done\n")));
+
+       if (!root) {
+               iput(inode);
+               return NULL;
+       }
+       sb->s_root = root;
+       sb->s_dirt = !dev->isCheckpointed;
+       T(YAFFS_TRACE_ALWAYS,
+               (TSTR("yaffs_read_super: isCheckpointed %d\n"),
+               dev->isCheckpointed));
+
+       T(YAFFS_TRACE_OS, (TSTR("yaffs_read_super: done\n")));
+       return sb;
+}
+
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs_internal_read_super_mtd(struct super_block *sb, void *data,
+                                        int silent)
+{
+       return yaffs_internal_read_super(1, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs_read_super(struct file_system_type *fs,
+                           int flags, const char *dev_name,
+                           void *data, struct vfsmount *mnt)
+{
+
+       return get_sb_bdev(fs, flags, dev_name, data,
+                          yaffs_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs_read_super(struct file_system_type *fs,
+                                           int flags, const char *dev_name,
+                                           void *data)
+{
+
+       return get_sb_bdev(fs, flags, dev_name, data,
+                          yaffs_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs_fs_type = {
+       .owner = THIS_MODULE,
+       .name = "yaffs",
+       .get_sb = yaffs_read_super,
+       .kill_sb = kill_block_super,
+       .fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs_read_super(struct super_block *sb, void *data,
+                                           int silent)
+{
+       return yaffs_internal_read_super(1, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs_fs_type, "yaffs", yaffs_read_super,
+                     FS_REQUIRES_DEV);
+#endif
+
+
+#ifdef CONFIG_YAFFS_YAFFS2
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
+static int yaffs2_internal_read_super_mtd(struct super_block *sb, void *data,
+                                         int silent)
+{
+       return yaffs_internal_read_super(2, sb, data, silent) ? 0 : -EINVAL;
+}
+
+#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
+static int yaffs2_read_super(struct file_system_type *fs,
+                       int flags, const char *dev_name, void *data,
+                       struct vfsmount *mnt)
+{
+       return get_sb_bdev(fs, flags, dev_name, data,
+                       yaffs2_internal_read_super_mtd, mnt);
+}
+#else
+static struct super_block *yaffs2_read_super(struct file_system_type *fs,
+                                            int flags, const char *dev_name,
+                                            void *data)
+{
+
+       return get_sb_bdev(fs, flags, dev_name, data,
+                          yaffs2_internal_read_super_mtd);
+}
+#endif
+
+static struct file_system_type yaffs2_fs_type = {
+       .owner = THIS_MODULE,
+       .name = "yaffs2",
+       .get_sb = yaffs2_read_super,
+       .kill_sb = kill_block_super,
+       .fs_flags = FS_REQUIRES_DEV,
+};
+#else
+static struct super_block *yaffs2_read_super(struct super_block *sb,
+                                            void *data, int silent)
+{
+       return yaffs_internal_read_super(2, sb, data, silent);
+}
+
+static DECLARE_FSTYPE(yaffs2_fs_type, "yaffs2", yaffs2_read_super,
+                     FS_REQUIRES_DEV);
+#endif
+
+#endif                         /* CONFIG_YAFFS_YAFFS2 */
+
+static struct proc_dir_entry *my_proc_entry;
+static struct proc_dir_entry *debug_proc_entry;
+
+static char *yaffs_dump_dev_part0(char *buf, yaffs_Device * dev)
+{
+       buf += sprintf(buf, "startBlock......... %d\n", dev->param.startBlock);
+       buf += sprintf(buf, "endBlock........... %d\n", dev->param.endBlock);
+       buf += sprintf(buf, "totalBytesPerChunk. %d\n", dev->param.totalBytesPerChunk);
+       buf += sprintf(buf, "useNANDECC......... %d\n", dev->param.useNANDECC);
+       buf += sprintf(buf, "noTagsECC.......... %d\n", dev->param.noTagsECC);
+       buf += sprintf(buf, "isYaffs2........... %d\n", dev->param.isYaffs2);
+       buf += sprintf(buf, "inbandTags......... %d\n", dev->param.inbandTags);
+       buf += sprintf(buf, "emptyLostAndFound.. %d\n", dev->param.emptyLostAndFound);
+       buf += sprintf(buf, "disableLazyLoad.... %d\n", dev->param.disableLazyLoad);
+       buf += sprintf(buf, "refreshPeriod...... %d\n", dev->param.refreshPeriod);
+       buf += sprintf(buf, "nShortOpCaches..... %d\n", dev->param.nShortOpCaches);
+       buf += sprintf(buf, "nReservedBlocks.... %d\n", dev->param.nReservedBlocks);
+       buf += sprintf(buf, "alwaysCheckErased.. %d\n", dev->param.alwaysCheckErased);
+
+       buf += sprintf(buf, "\n");
+
+       return buf;
+}
+
+
+static char *yaffs_dump_dev_part1(char *buf, yaffs_Device * dev)
+{
+       buf += sprintf(buf, "nDataBytesPerChunk. %d\n", dev->nDataBytesPerChunk);
+       buf += sprintf(buf, "chunkGroupBits..... %d\n", dev->chunkGroupBits);
+       buf += sprintf(buf, "chunkGroupSize..... %d\n", dev->chunkGroupSize);
+       buf += sprintf(buf, "nErasedBlocks...... %d\n", dev->nErasedBlocks);
+       buf += sprintf(buf, "blocksInCheckpoint. %d\n", dev->blocksInCheckpoint);
+       buf += sprintf(buf, "\n");
+       buf += sprintf(buf, "nTnodes............ %d\n", dev->nTnodes);
+       buf += sprintf(buf, "nObjects........... %d\n", dev->nObjects);
+       buf += sprintf(buf, "nFreeChunks........ %d\n", dev->nFreeChunks);
+       buf += sprintf(buf, "\n");
+       buf += sprintf(buf, "nPageWrites........ %u\n", dev->nPageWrites);
+       buf += sprintf(buf, "nPageReads......... %u\n", dev->nPageReads);
+       buf += sprintf(buf, "nBlockErasures..... %u\n", dev->nBlockErasures);
+       buf += sprintf(buf, "nGCCopies.......... %u\n", dev->nGCCopies);
+       buf += sprintf(buf, "allGCs............. %u\n", dev->allGCs);
+       buf += sprintf(buf, "passiveGCs......... %u\n", dev->passiveGCs);
+       buf += sprintf(buf, "oldestDirtyGCs..... %u\n", dev->oldestDirtyGCs);
+       buf += sprintf(buf, "nGCBlocks.......... %u\n", dev->nGCBlocks);
+       buf += sprintf(buf, "backgroundGCs...... %u\n", dev->backgroundGCs);
+       buf += sprintf(buf, "nRetriedWrites..... %u\n", dev->nRetriedWrites);
+       buf += sprintf(buf, "nRetireBlocks...... %u\n", dev->nRetiredBlocks);
+       buf += sprintf(buf, "eccFixed........... %u\n", dev->eccFixed);
+       buf += sprintf(buf, "eccUnfixed......... %u\n", dev->eccUnfixed);
+       buf += sprintf(buf, "tagsEccFixed....... %u\n", dev->tagsEccFixed);
+       buf += sprintf(buf, "tagsEccUnfixed..... %u\n", dev->tagsEccUnfixed);
+       buf += sprintf(buf, "cacheHits.......... %u\n", dev->cacheHits);
+       buf += sprintf(buf, "nDeletedFiles...... %u\n", dev->nDeletedFiles);
+       buf += sprintf(buf, "nUnlinkedFiles..... %u\n", dev->nUnlinkedFiles);
+       buf += sprintf(buf, "refreshCount....... %u\n", dev->refreshCount);
+       buf +=
+           sprintf(buf, "nBackgroudDeletions %u\n", dev->nBackgroundDeletions);
+
+       return buf;
+}
+
+static int yaffs_proc_read(char *page,
+                          char **start,
+                          off_t offset, int count, int *eof, void *data)
+{
+       struct ylist_head *item;
+       char *buf = page;
+       int step = offset;
+       int n = 0;
+
+       /* Get proc_file_read() to step 'offset' by one on each sucessive call.
+        * We use 'offset' (*ppos) to indicate where we are in devList.
+        * This also assumes the user has posted a read buffer large
+        * enough to hold the complete output; but that's life in /proc.
+        */
+
+       *(int *)start = 1;
+
+       /* Print header first */
+       if (step == 0)
+               buf += sprintf(buf, "Multi-version YAFFS built:" __DATE__ " " __TIME__"\n");
+       else if (step == 1)
+               buf += sprintf(buf,"\n");
+       else {
+               step-=2;
+               
+               down(&yaffs_context_lock);
+
+               /* Locate and print the Nth entry.  Order N-squared but N is small. */
+               ylist_for_each(item, &yaffs_context_list) {
+                       struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
+                       yaffs_Device *dev = dc->dev;
+
+                       if (n < (step & ~1)) {
+                               n+=2;
+                               continue;
+                       }
+                       if((step & 1)==0){
+                               buf += sprintf(buf, "\nDevice %d \"%s\"\n", n, dev->param.name);
+                               buf = yaffs_dump_dev_part0(buf, dev);
+                       } else
+                               buf = yaffs_dump_dev_part1(buf, dev);
+                       
+                       break;
+               }
+               up(&yaffs_context_lock);
+       }
+
+       return buf - page < count ? buf - page : count;
+}
+
+static int yaffs_stats_proc_read(char *page,
+                               char **start,
+                               off_t offset, int count, int *eof, void *data)
+{
+       struct ylist_head *item;
+       char *buf = page;
+       int n = 0;
+
+       down(&yaffs_context_lock);
+
+       /* Locate and print the Nth entry.  Order N-squared but N is small. */
+       ylist_for_each(item, &yaffs_context_list) {
+               struct yaffs_LinuxContext *dc = ylist_entry(item, struct yaffs_LinuxContext, contextList);
+               yaffs_Device *dev = dc->dev;
+
+               int erasedChunks;
+
+               erasedChunks = dev->nErasedBlocks * dev->param.nChunksPerBlock;
+               
+               buf += sprintf(buf,"%d, %d, %d, %u, %u, %u, %u\n",
+                               n, dev->nFreeChunks, erasedChunks,
+                               dev->backgroundGCs, dev->oldestDirtyGCs,
+                               dev->nObjects, dev->nTnodes);
+       }
+       up(&yaffs_context_lock);
+
+
+       return buf - page < count ? buf - page : count;
+}
+
+/**
+ * Set the verbosity of the warnings and error messages.
+ *
+ * Note that the names can only be a..z or _ with the current code.
+ */
+
+static struct {
+       char *mask_name;
+       unsigned mask_bitfield;
+} mask_flags[] = {
+       {"allocate", YAFFS_TRACE_ALLOCATE},
+       {"always", YAFFS_TRACE_ALWAYS},
+       {"background", YAFFS_TRACE_BACKGROUND},
+       {"bad_blocks", YAFFS_TRACE_BAD_BLOCKS},
+       {"buffers", YAFFS_TRACE_BUFFERS},
+       {"bug", YAFFS_TRACE_BUG},
+       {"checkpt", YAFFS_TRACE_CHECKPOINT},
+       {"deletion", YAFFS_TRACE_DELETION},
+       {"erase", YAFFS_TRACE_ERASE},
+       {"error", YAFFS_TRACE_ERROR},
+       {"gc_detail", YAFFS_TRACE_GC_DETAIL},
+       {"gc", YAFFS_TRACE_GC},
+       {"lock", YAFFS_TRACE_LOCK},
+       {"mtd", YAFFS_TRACE_MTD},
+       {"nandaccess", YAFFS_TRACE_NANDACCESS},
+       {"os", YAFFS_TRACE_OS},
+       {"scan_debug", YAFFS_TRACE_SCAN_DEBUG},
+       {"scan", YAFFS_TRACE_SCAN},
+       {"tracing", YAFFS_TRACE_TRACING},
+       {"sync", YAFFS_TRACE_SYNC},
+       {"write", YAFFS_TRACE_WRITE},
+
+       {"verify", YAFFS_TRACE_VERIFY},
+       {"verify_nand", YAFFS_TRACE_VERIFY_NAND},
+       {"verify_full", YAFFS_TRACE_VERIFY_FULL},
+       {"verify_all", YAFFS_TRACE_VERIFY_ALL},
+
+       {"all", 0xffffffff},
+       {"none", 0},
+       {NULL, 0},
+};
+
+#define MAX_MASK_NAME_LENGTH 40
+static int yaffs_proc_write_trace_options(struct file *file, const char *buf,
+                                        unsigned long count, void *data)
+{
+       unsigned rg = 0, mask_bitfield;
+       char *end;
+       char *mask_name;
+       const char *x;
+       char substring[MAX_MASK_NAME_LENGTH + 1];
+       int i;
+       int done = 0;
+       int add, len = 0;
+       int pos = 0;
+
+       rg = yaffs_traceMask;
+
+       while (!done && (pos < count)) {
+               done = 1;
+               while ((pos < count) && isspace(buf[pos]))
+                       pos++;
+
+               switch (buf[pos]) {
+               case '+':
+               case '-':
+               case '=':
+                       add = buf[pos];
+                       pos++;
+                       break;
+
+               default:
+                       add = ' ';
+                       break;
+               }
+               mask_name = NULL;
+
+               mask_bitfield = simple_strtoul(buf + pos, &end, 0);
+
+               if (end > buf + pos) {
+                       mask_name = "numeral";
+                       len = end - (buf + pos);
+                       pos += len;
+                       done = 0;
+               } else {
+                       for (x = buf + pos, i = 0;
+                           (*x == '_' || (*x >= 'a' && *x <= 'z')) &&
+                           i < MAX_MASK_NAME_LENGTH; x++, i++, pos++)
+                               substring[i] = *x;
+                       substring[i] = '\0';
+
+                       for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+                               if (strcmp(substring, mask_flags[i].mask_name) == 0) {
+                                       mask_name = mask_flags[i].mask_name;
+                                       mask_bitfield = mask_flags[i].mask_bitfield;
+                                       done = 0;
+                                       break;
+                               }
+                       }
+               }
+
+               if (mask_name != NULL) {
+                       done = 0;
+                       switch (add) {
+                       case '-':
+                               rg &= ~mask_bitfield;
+                               break;
+                       case '+':
+                               rg |= mask_bitfield;
+                               break;
+                       case '=':
+                               rg = mask_bitfield;
+                               break;
+                       default:
+                               rg |= mask_bitfield;
+                               break;
+                       }
+               }
+       }
+
+       yaffs_traceMask = rg | YAFFS_TRACE_ALWAYS;
+
+       printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_traceMask);
+
+       if (rg & YAFFS_TRACE_ALWAYS) {
+               for (i = 0; mask_flags[i].mask_name != NULL; i++) {
+                       char flag;
+                       flag = ((rg & mask_flags[i].mask_bitfield) ==
+                               mask_flags[i].mask_bitfield) ? '+' : '-';
+                       printk(KERN_DEBUG "%c%s\n", flag, mask_flags[i].mask_name);
+               }
+       }
+
+       return count;
+}
+
+
+static int yaffs_proc_write(struct file *file, const char *buf,
+                                        unsigned long count, void *data)
+{
+        return yaffs_proc_write_trace_options(file, buf, count, data);
+}
+
+/* Stuff to handle installation of file systems */
+struct file_system_to_install {
+       struct file_system_type *fst;
+       int installed;
+};
+
+static struct file_system_to_install fs_to_install[] = {
+       {&yaffs_fs_type, 0},
+       {&yaffs2_fs_type, 0},
+       {NULL, 0}
+};
+
+static int __init init_yaffs_fs(void)
+{
+       int error = 0;
+       struct file_system_to_install *fsinst;
+
+       T(YAFFS_TRACE_ALWAYS,
+         (TSTR("yaffs built " __DATE__ " " __TIME__ " Installing. \n")));
+
+#ifdef CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED
+       T(YAFFS_TRACE_ALWAYS,
+         (TSTR(" \n\n\n\nYAFFS-WARNING CONFIG_YAFFS_ALWAYS_CHECK_CHUNK_ERASED selected.\n\n\n\n")));
+#endif
+
+
+
+
+       init_MUTEX(&yaffs_context_lock);
+
+       /* Install the proc_fs entries */
+       my_proc_entry = create_proc_entry("yaffs",
+                                              S_IRUGO | S_IFREG,
+                                              YPROC_ROOT);
+
+       if (my_proc_entry) {
+               my_proc_entry->write_proc = yaffs_proc_write;
+               my_proc_entry->read_proc = yaffs_proc_read;
+               my_proc_entry->data = NULL;
+       } else
+               return -ENOMEM;
+
+       debug_proc_entry = create_proc_entry("yaffs_stats",
+                                              S_IRUGO | S_IFREG,
+                                              YPROC_ROOT);
+
+       if (debug_proc_entry) {
+               debug_proc_entry->write_proc = NULL;
+               debug_proc_entry->read_proc = yaffs_stats_proc_read;
+               debug_proc_entry->data = NULL;
+       } else
+               return -ENOMEM;
+
+       /* Now add the file system entries */
+
+       fsinst = fs_to_install;
+
+       while (fsinst->fst && !error) {
+               error = register_filesystem(fsinst->fst);
+               if (!error)
+                       fsinst->installed = 1;
+               fsinst++;
+       }
+
+       /* Any errors? uninstall  */
+       if (error) {
+               fsinst = fs_to_install;
+
+               while (fsinst->fst) {
+                       if (fsinst->installed) {
+                               unregister_filesystem(fsinst->fst);
+                               fsinst->installed = 0;
+                       }
+                       fsinst++;
+               }
+       }
+
+       return error;
+}
+
+static void __exit exit_yaffs_fs(void)
+{
+
+       struct file_system_to_install *fsinst;
+
+       T(YAFFS_TRACE_ALWAYS,
+               (TSTR("yaffs built " __DATE__ " " __TIME__ " removing. \n")));
+
+       remove_proc_entry("yaffs", YPROC_ROOT);
+       remove_proc_entry("yaffs_stats", YPROC_ROOT);
+
+       fsinst = fs_to_install;
+
+       while (fsinst->fst) {
+               if (fsinst->installed) {
+                       unregister_filesystem(fsinst->fst);
+                       fsinst->installed = 0;
+               }
+               fsinst++;
+       }
+}
+
+module_init(init_yaffs_fs)
+module_exit(exit_yaffs_fs)
+
+MODULE_DESCRIPTION("YAFFS2 - a NAND specific flash file system");
+MODULE_AUTHOR("Charles Manning, Aleph One Ltd., 2002-2010");
+MODULE_LICENSE("GPL");
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.c
@@ -0,0 +1,465 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include "yaffs_yaffs1.h"
+#include "yportenv.h"
+#include "yaffs_trace.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_nand.h"
+
+
+int yaffs1_Scan(yaffs_Device *dev)
+{
+       yaffs_ExtendedTags tags;
+       int blk;
+       int blockIterator;
+       int startIterator;
+       int endIterator;
+       int result;
+
+       int chunk;
+       int c;
+       int deleted;
+       yaffs_BlockState state;
+       yaffs_Object *hardList = NULL;
+       yaffs_BlockInfo *bi;
+       __u32 sequenceNumber;
+       yaffs_ObjectHeader *oh;
+       yaffs_Object *in;
+       yaffs_Object *parent;
+
+       int alloc_failed = 0;
+
+       struct yaffs_ShadowFixerStruct *shadowFixerList = NULL;
+
+
+       __u8 *chunkData;
+
+
+
+       T(YAFFS_TRACE_SCAN,
+         (TSTR("yaffs1_Scan starts  intstartblk %d intendblk %d..." TENDSTR),
+          dev->internalStartBlock, dev->internalEndBlock));
+
+       chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+       dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+       /* Scan all the blocks to determine their state */
+       bi = dev->blockInfo;
+       for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+               yaffs_ClearChunkBits(dev, blk);
+               bi->pagesInUse = 0;
+               bi->softDeletions = 0;
+
+               yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+               bi->blockState = state;
+               bi->sequenceNumber = sequenceNumber;
+
+               if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
+                       bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+
+               T(YAFFS_TRACE_SCAN_DEBUG,
+                 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+                  state, sequenceNumber));
+
+               if (state == YAFFS_BLOCK_STATE_DEAD) {
+                       T(YAFFS_TRACE_BAD_BLOCKS,
+                         (TSTR("block %d is bad" TENDSTR), blk));
+               } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+                       T(YAFFS_TRACE_SCAN_DEBUG,
+                         (TSTR("Block empty " TENDSTR)));
+                       dev->nErasedBlocks++;
+                       dev->nFreeChunks += dev->param.nChunksPerBlock;
+               }
+               bi++;
+       }
+
+       startIterator = dev->internalStartBlock;
+       endIterator = dev->internalEndBlock;
+
+       /* For each block.... */
+       for (blockIterator = startIterator; !alloc_failed && blockIterator <= endIterator;
+            blockIterator++) {
+
+               YYIELD();
+
+               YYIELD();
+
+               blk = blockIterator;
+
+               bi = yaffs_GetBlockInfo(dev, blk);
+               state = bi->blockState;
+
+               deleted = 0;
+
+               /* For each chunk in each block that needs scanning....*/
+               for (c = 0; !alloc_failed && c < dev->param.nChunksPerBlock &&
+                    state == YAFFS_BLOCK_STATE_NEEDS_SCANNING; c++) {
+                       /* Read the tags and decide what to do */
+                       chunk = blk * dev->param.nChunksPerBlock + c;
+
+                       result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+                                                       &tags);
+
+                       /* Let's have a good look at this chunk... */
+
+                       if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED || tags.chunkDeleted) {
+                               /* YAFFS1 only...
+                                * A deleted chunk
+                                */
+                               deleted++;
+                               dev->nFreeChunks++;
+                               /*T((" %d %d deleted\n",blk,c)); */
+                       } else if (!tags.chunkUsed) {
+                               /* An unassigned chunk in the block
+                                * This means that either the block is empty or
+                                * this is the one being allocated from
+                                */
+
+                               if (c == 0) {
+                                       /* We're looking at the first chunk in the block so the block is unused */
+                                       state = YAFFS_BLOCK_STATE_EMPTY;
+                                       dev->nErasedBlocks++;
+                               } else {
+                                       /* this is the block being allocated from */
+                                       T(YAFFS_TRACE_SCAN,
+                                         (TSTR
+                                          (" Allocating from %d %d" TENDSTR),
+                                          blk, c));
+                                       state = YAFFS_BLOCK_STATE_ALLOCATING;
+                                       dev->allocationBlock = blk;
+                                       dev->allocationPage = c;
+                                       dev->allocationBlockFinder = blk;
+                                       /* Set block finder here to encourage the allocator to go forth from here. */
+
+                               }
+
+                               dev->nFreeChunks += (dev->param.nChunksPerBlock - c);
+                       } else if (tags.chunkId > 0) {
+                               /* chunkId > 0 so it is a data chunk... */
+                               unsigned int endpos;
+
+                               yaffs_SetChunkBit(dev, blk, c);
+                               bi->pagesInUse++;
+
+                               in = yaffs_FindOrCreateObjectByNumber(dev,
+                                                                     tags.
+                                                                     objectId,
+                                                                     YAFFS_OBJECT_TYPE_FILE);
+                               /* PutChunkIntoFile checks for a clash (two data chunks with
+                                * the same chunkId).
+                                */
+
+                               if (!in)
+                                       alloc_failed = 1;
+
+                               if (in) {
+                                       if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, 1))
+                                               alloc_failed = 1;
+                               }
+
+                               endpos =
+                                   (tags.chunkId - 1) * dev->nDataBytesPerChunk +
+                                   tags.byteCount;
+                               if (in &&
+                                   in->variantType == YAFFS_OBJECT_TYPE_FILE
+                                   && in->variant.fileVariant.scannedFileSize <
+                                   endpos) {
+                                       in->variant.fileVariant.
+                                           scannedFileSize = endpos;
+                                       if (!dev->param.useHeaderFileSize) {
+                                               in->variant.fileVariant.
+                                                   fileSize =
+                                                   in->variant.fileVariant.
+                                                   scannedFileSize;
+                                       }
+
+                               }
+                               /* T((" %d %d data %d %d\n",blk,c,tags.objectId,tags.chunkId));   */
+                       } else {
+                               /* chunkId == 0, so it is an ObjectHeader.
+                                * Thus, we read in the object header and make the object
+                                */
+                               yaffs_SetChunkBit(dev, blk, c);
+                               bi->pagesInUse++;
+
+                               result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk,
+                                                               chunkData,
+                                                               NULL);
+
+                               oh = (yaffs_ObjectHeader *) chunkData;
+
+                               in = yaffs_FindObjectByNumber(dev,
+                                                             tags.objectId);
+                               if (in && in->variantType != oh->type) {
+                                       /* This should not happen, but somehow
+                                        * Wev'e ended up with an objectId that has been reused but not yet
+                                        * deleted, and worse still it has changed type. Delete the old object.
+                                        */
+
+                                       yaffs_DeleteObject(in);
+
+                                       in = 0;
+                               }
+
+                               in = yaffs_FindOrCreateObjectByNumber(dev,
+                                                                     tags.
+                                                                     objectId,
+                                                                     oh->type);
+
+                               if (!in)
+                                       alloc_failed = 1;
+
+                               if (in && oh->shadowsObject > 0) {
+
+                                       struct yaffs_ShadowFixerStruct *fixer;
+                                       fixer = YMALLOC(sizeof(struct yaffs_ShadowFixerStruct));
+                                       if (fixer) {
+                                               fixer->next = shadowFixerList;
+                                               shadowFixerList = fixer;
+                                               fixer->objectId = tags.objectId;
+                                               fixer->shadowedId = oh->shadowsObject;
+                                               T(YAFFS_TRACE_SCAN,
+                                                 (TSTR
+                                                  (" Shadow fixer: %d shadows %d" TENDSTR),
+                                                  fixer->objectId, fixer->shadowedId));
+
+                                       }
+
+                               }
+
+                               if (in && in->valid) {
+                                       /* We have already filled this one. We have a duplicate and need to resolve it. */
+
+                                       unsigned existingSerial = in->serial;
+                                       unsigned newSerial = tags.serialNumber;
+
+                                       if (((existingSerial + 1) & 3) == newSerial) {
+                                               /* Use new one - destroy the exisiting one */
+                                               yaffs_DeleteChunk(dev,
+                                                                 in->hdrChunk,
+                                                                 1, __LINE__);
+                                               in->valid = 0;
+                                       } else {
+                                               /* Use existing - destroy this one. */
+                                               yaffs_DeleteChunk(dev, chunk, 1,
+                                                                 __LINE__);
+                                       }
+                               }
+
+                               if (in && !in->valid &&
+                                   (tags.objectId == YAFFS_OBJECTID_ROOT ||
+                                    tags.objectId == YAFFS_OBJECTID_LOSTNFOUND)) {
+                                       /* We only load some info, don't fiddle with directory structure */
+                                       in->valid = 1;
+                                       in->variantType = oh->type;
+
+                                       in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+                                       in->win_atime[0] = oh->win_atime[0];
+                                       in->win_ctime[0] = oh->win_ctime[0];
+                                       in->win_mtime[0] = oh->win_mtime[0];
+                                       in->win_atime[1] = oh->win_atime[1];
+                                       in->win_ctime[1] = oh->win_ctime[1];
+                                       in->win_mtime[1] = oh->win_mtime[1];
+#else
+                                       in->yst_uid = oh->yst_uid;
+                                       in->yst_gid = oh->yst_gid;
+                                       in->yst_atime = oh->yst_atime;
+                                       in->yst_mtime = oh->yst_mtime;
+                                       in->yst_ctime = oh->yst_ctime;
+                                       in->yst_rdev = oh->yst_rdev;
+#endif
+                                       in->hdrChunk = chunk;
+                                       in->serial = tags.serialNumber;
+
+                               } else if (in && !in->valid) {
+                                       /* we need to load this info */
+
+                                       in->valid = 1;
+                                       in->variantType = oh->type;
+
+                                       in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+                                       in->win_atime[0] = oh->win_atime[0];
+                                       in->win_ctime[0] = oh->win_ctime[0];
+                                       in->win_mtime[0] = oh->win_mtime[0];
+                                       in->win_atime[1] = oh->win_atime[1];
+                                       in->win_ctime[1] = oh->win_ctime[1];
+                                       in->win_mtime[1] = oh->win_mtime[1];
+#else
+                                       in->yst_uid = oh->yst_uid;
+                                       in->yst_gid = oh->yst_gid;
+                                       in->yst_atime = oh->yst_atime;
+                                       in->yst_mtime = oh->yst_mtime;
+                                       in->yst_ctime = oh->yst_ctime;
+                                       in->yst_rdev = oh->yst_rdev;
+#endif
+                                       in->hdrChunk = chunk;
+                                       in->serial = tags.serialNumber;
+
+                                       yaffs_SetObjectNameFromOH(in, oh);
+                                       in->dirty = 0;
+
+                                       /* directory stuff...
+                                        * hook up to parent
+                                        */
+
+                                       parent =
+                                           yaffs_FindOrCreateObjectByNumber
+                                           (dev, oh->parentObjectId,
+                                            YAFFS_OBJECT_TYPE_DIRECTORY);
+                                       if (!parent)
+                                               alloc_failed = 1;
+                                       if (parent && parent->variantType ==
+                                           YAFFS_OBJECT_TYPE_UNKNOWN) {
+                                               /* Set up as a directory */
+                                               parent->variantType =
+                                                       YAFFS_OBJECT_TYPE_DIRECTORY;
+                                               YINIT_LIST_HEAD(&parent->variant.
+                                                               directoryVariant.
+                                                               children);
+                                       } else if (!parent || parent->variantType !=
+                                                  YAFFS_OBJECT_TYPE_DIRECTORY) {
+                                               /* Hoosterman, another problem....
+                                                * We're trying to use a non-directory as a directory
+                                                */
+
+                                               T(YAFFS_TRACE_ERROR,
+                                                 (TSTR
+                                                  ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+                                                   TENDSTR)));
+                                               parent = dev->lostNFoundDir;
+                                       }
+
+                                       yaffs_AddObjectToDirectory(parent, in);
+
+                                       if (0 && (parent == dev->deletedDir ||
+                                                 parent == dev->unlinkedDir)) {
+                                               in->deleted = 1;        /* If it is unlinked at start up then it wants deleting */
+                                               dev->nDeletedFiles++;
+                                       }
+                                       /* Note re hardlinks.
+                                        * Since we might scan a hardlink before its equivalent object is scanned
+                                        * we put them all in a list.
+                                        * After scanning is complete, we should have all the objects, so we run through this
+                                        * list and fix up all the chains.
+                                        */
+
+                                       switch (in->variantType) {
+                                       case YAFFS_OBJECT_TYPE_UNKNOWN:
+                                               /* Todo got a problem */
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_FILE:
+                                               if (dev->param.useHeaderFileSize)
+
+                                                       in->variant.fileVariant.
+                                                           fileSize =
+                                                           oh->fileSize;
+
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_HARDLINK:
+                                               in->variant.hardLinkVariant.
+                                                       equivalentObjectId =
+                                                       oh->equivalentObjectId;
+                                               in->hardLinks.next =
+                                                       (struct ylist_head *)
+                                                       hardList;
+                                               hardList = in;
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_DIRECTORY:
+                                               /* Do nothing */
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_SPECIAL:
+                                               /* Do nothing */
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_SYMLINK:
+                                               in->variant.symLinkVariant.alias =
+                                                   yaffs_CloneString(oh->alias);
+                                               if (!in->variant.symLinkVariant.alias)
+                                                       alloc_failed = 1;
+                                               break;
+                                       }
+
+                               }
+                       }
+               }
+
+               if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+                       /* If we got this far while scanning, then the block is fully allocated.*/
+                       state = YAFFS_BLOCK_STATE_FULL;
+               }
+
+               if (state == YAFFS_BLOCK_STATE_ALLOCATING) {
+                       /* If the block was partially allocated then treat it as fully allocated.*/
+                       state = YAFFS_BLOCK_STATE_FULL;
+                       dev->allocationBlock = -1;
+               }
+
+               bi->blockState = state;
+
+               /* Now let's see if it was dirty */
+               if (bi->pagesInUse == 0 &&
+                   !bi->hasShrinkHeader &&
+                   bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+                       yaffs_BlockBecameDirty(dev, blk);
+               }
+
+       }
+
+
+       /* Ok, we've done all the scanning.
+        * Fix up the hard link chains.
+        * We should now have scanned all the objects, now it's time to add these
+        * hardlinks.
+        */
+
+       yaffs_HardlinkFixup(dev, hardList);
+
+       /* Fix up any shadowed objects */
+       {
+               struct yaffs_ShadowFixerStruct *fixer;
+               yaffs_Object *obj;
+
+               while (shadowFixerList) {
+                       fixer = shadowFixerList;
+                       shadowFixerList = fixer->next;
+                       /* Complete the rename transaction by deleting the shadowed object
+                        * then setting the object header to unshadowed.
+                        */
+                       obj = yaffs_FindObjectByNumber(dev, fixer->shadowedId);
+                       if (obj)
+                               yaffs_DeleteObject(obj);
+
+                       obj = yaffs_FindObjectByNumber(dev, fixer->objectId);
+
+                       if (obj)
+                               yaffs_UpdateObjectHeader(obj, NULL, 1, 0, 0, NULL);
+
+                       YFREE(fixer);
+               }
+       }
+
+       yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+       if (alloc_failed)
+               return YAFFS_FAIL;
+
+       T(YAFFS_TRACE_SCAN, (TSTR("yaffs1_Scan ends" TENDSTR)));
+
+
+       return YAFFS_OK;
+}
+
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs1.h
@@ -0,0 +1,22 @@
+/*
+ * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1 as
+ * published by the Free Software Foundation.
+ *
+ * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
+ */
+
+#ifndef __YAFFS_YAFFS1_H__
+#define __YAFFS_YAFFS1_H__
+
+#include "yaffs_guts.h"
+int yaffs1_Scan(yaffs_Device *dev);
+
+#endif
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.c
@@ -0,0 +1,1540 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+
+#include "yaffs_guts.h"
+#include "yaffs_trace.h"
+#include "yaffs_yaffs2.h"
+#include "yaffs_checkptrw.h"
+#include "yaffs_bitmap.h"
+#include "yaffs_qsort.h"
+#include "yaffs_nand.h"
+#include "yaffs_getblockinfo.h"
+#include "yaffs_verify.h"
+
+/*
+ * Checkpoints are really no benefit on very small partitions.
+ *
+ * To save space on small partitions don't bother with checkpoints unless
+ * the partition is at least this big.
+ */
+#define YAFFS_CHECKPOINT_MIN_BLOCKS 60
+
+#define YAFFS_SMALL_HOLE_THRESHOLD 4
+
+
+/*
+ * Oldest Dirty Sequence Number handling.
+ */
+ 
+/* yaffs2_CalcOldestDirtySequence()
+ * yaffs2_FindOldestDirtySequence()
+ * Calculate the oldest dirty sequence number if we don't know it.
+ */
+void yaffs2_CalcOldestDirtySequence(yaffs_Device *dev)
+{
+       int i;
+       unsigned seq;
+       unsigned blockNo = 0;
+       yaffs_BlockInfo *b;
+
+       if(!dev->param.isYaffs2)
+               return;
+
+       /* Find the oldest dirty sequence number. */
+       seq = dev->sequenceNumber + 1;
+       b = dev->blockInfo;
+       for (i = dev->internalStartBlock; i <= dev->internalEndBlock; i++) {
+               if (b->blockState == YAFFS_BLOCK_STATE_FULL &&
+                       (b->pagesInUse - b->softDeletions) < dev->param.nChunksPerBlock &&
+                       b->sequenceNumber < seq) {
+                       seq = b->sequenceNumber;
+                       blockNo = i;
+               }
+               b++;
+       }
+
+       if(blockNo){
+               dev->oldestDirtySequence = seq;
+               dev->oldestDirtyBlock = blockNo;
+       }
+
+}
+
+
+void yaffs2_FindOldestDirtySequence(yaffs_Device *dev)
+{
+       if(!dev->param.isYaffs2)
+               return;
+
+       if(!dev->oldestDirtySequence)
+               yaffs2_CalcOldestDirtySequence(dev);
+}
+
+/*
+ * yaffs_ClearOldestDirtySequence()
+ * Called when a block is erased or marked bad. (ie. when its sequenceNumber
+ * becomes invalid). If the value matches the oldest then we clear 
+ * dev->oldestDirtySequence to force its recomputation.
+ */
+void yaffs2_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi)
+{
+
+       if(!dev->param.isYaffs2)
+               return;
+
+       if(!bi || bi->sequenceNumber == dev->oldestDirtySequence){
+               dev->oldestDirtySequence = 0;
+               dev->oldestDirtyBlock = 0;
+       }
+}
+
+/*
+ * yaffs2_UpdateOldestDirtySequence()
+ * Update the oldest dirty sequence number whenever we dirty a block.
+ * Only do this if the oldestDirtySequence is actually being tracked.
+ */
+void yaffs2_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi)
+{
+       if(!dev->param.isYaffs2)
+               return;
+
+       if(dev->oldestDirtySequence){
+               if(dev->oldestDirtySequence > bi->sequenceNumber){
+                       dev->oldestDirtySequence = bi->sequenceNumber;
+                       dev->oldestDirtyBlock = blockNo;
+               }
+       }
+}
+
+int yaffs2_BlockNotDisqualifiedFromGC(yaffs_Device *dev,
+                                       yaffs_BlockInfo *bi)
+{
+
+       if (!dev->param.isYaffs2)
+               return 1;       /* disqualification only applies to yaffs2. */
+
+       if (!bi->hasShrinkHeader)
+               return 1;       /* can gc */
+
+       yaffs2_FindOldestDirtySequence(dev);
+
+       /* Can't do gc of this block if there are any blocks older than this one that have
+        * discarded pages.
+        */
+       return (bi->sequenceNumber <= dev->oldestDirtySequence);
+}
+
+/*
+ * yaffs2_FindRefreshBlock()
+ * periodically finds the oldest full block by sequence number for refreshing.
+ * Only for yaffs2.
+ */
+__u32 yaffs2_FindRefreshBlock(yaffs_Device *dev)
+{
+       __u32 b ;
+
+       __u32 oldest = 0;
+       __u32 oldestSequence = 0;
+
+       yaffs_BlockInfo *bi;
+
+       if(!dev->param.isYaffs2)
+               return oldest;
+
+       /*
+        * If refresh period < 10 then refreshing is disabled.
+        */
+       if(dev->param.refreshPeriod < 10)
+               return oldest;
+
+        /*
+         * Fix broken values.
+         */
+        if(dev->refreshSkip > dev->param.refreshPeriod)
+                dev->refreshSkip = dev->param.refreshPeriod;
+
+       if(dev->refreshSkip > 0)
+               return oldest;
+
+       /*
+        * Refresh skip is now zero.
+        * We'll do a refresh this time around....
+        * Update the refresh skip and find the oldest block.
+        */
+       dev->refreshSkip = dev->param.refreshPeriod;
+       dev->refreshCount++;
+       bi = dev->blockInfo;
+       for (b = dev->internalStartBlock; b <=dev->internalEndBlock; b++){
+
+               if (bi->blockState == YAFFS_BLOCK_STATE_FULL){
+
+                       if(oldest < 1 ||
+                                bi->sequenceNumber < oldestSequence){
+                                oldest = b;
+                                oldestSequence = bi->sequenceNumber;
+                        }
+               }
+               bi++;
+       }
+
+       if (oldest > 0) {
+               T(YAFFS_TRACE_GC,
+                 (TSTR("GC refresh count %d selected block %d with sequenceNumber %d" TENDSTR),
+                  dev->refreshCount, oldest, oldestSequence));
+       }
+
+       return oldest;
+}
+
+int yaffs2_CheckpointRequired(yaffs_Device *dev)
+{
+       int nblocks;
+       
+       if(!dev->param.isYaffs2)
+               return 0;
+       
+       nblocks = dev->internalEndBlock - dev->internalStartBlock + 1 ;
+
+       return  !dev->param.skipCheckpointWrite &&
+               !dev->readOnly &&
+               (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
+}
+
+int yaffs2_CalcCheckpointBlocksRequired(yaffs_Device *dev)
+{
+       int retval;
+
+       if(!dev->param.isYaffs2)
+               return 0;
+
+       if (!dev->nCheckpointBlocksRequired &&
+               yaffs2_CheckpointRequired(dev)){
+               /* Not a valid value so recalculate */
+               int nBytes = 0;
+               int nBlocks;
+               int devBlocks = (dev->param.endBlock - dev->param.startBlock + 1);
+
+               nBytes += sizeof(yaffs_CheckpointValidity);
+               nBytes += sizeof(yaffs_CheckpointDevice);
+               nBytes += devBlocks * sizeof(yaffs_BlockInfo);
+               nBytes += devBlocks * dev->chunkBitmapStride;
+               nBytes += (sizeof(yaffs_CheckpointObject) + sizeof(__u32)) * (dev->nObjects);
+               nBytes += (dev->tnodeSize + sizeof(__u32)) * (dev->nTnodes);
+               nBytes += sizeof(yaffs_CheckpointValidity);
+               nBytes += sizeof(__u32); /* checksum*/
+
+               /* Round up and add 2 blocks to allow for some bad blocks, so add 3 */
+
+               nBlocks = (nBytes/(dev->nDataBytesPerChunk * dev->param.nChunksPerBlock)) + 3;
+
+               dev->nCheckpointBlocksRequired = nBlocks;
+       }
+
+       retval = dev->nCheckpointBlocksRequired - dev->blocksInCheckpoint;
+       if(retval < 0)
+               retval = 0;
+       return retval;
+}
+
+/*--------------------- Checkpointing --------------------*/
+
+
+static int yaffs2_WriteCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+       yaffs_CheckpointValidity cp;
+
+       memset(&cp, 0, sizeof(cp));
+
+       cp.structType = sizeof(cp);
+       cp.magic = YAFFS_MAGIC;
+       cp.version = YAFFS_CHECKPOINT_VERSION;
+       cp.head = (head) ? 1 : 0;
+
+       return (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp)) ?
+               1 : 0;
+}
+
+static int yaffs2_ReadCheckpointValidityMarker(yaffs_Device *dev, int head)
+{
+       yaffs_CheckpointValidity cp;
+       int ok;
+
+       ok = (yaffs2_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+       if (ok)
+               ok = (cp.structType == sizeof(cp)) &&
+                    (cp.magic == YAFFS_MAGIC) &&
+                    (cp.version == YAFFS_CHECKPOINT_VERSION) &&
+                    (cp.head == ((head) ? 1 : 0));
+       return ok ? 1 : 0;
+}
+
+static void yaffs2_DeviceToCheckpointDevice(yaffs_CheckpointDevice *cp,
+                                          yaffs_Device *dev)
+{
+       cp->nErasedBlocks = dev->nErasedBlocks;
+       cp->allocationBlock = dev->allocationBlock;
+       cp->allocationPage = dev->allocationPage;
+       cp->nFreeChunks = dev->nFreeChunks;
+
+       cp->nDeletedFiles = dev->nDeletedFiles;
+       cp->nUnlinkedFiles = dev->nUnlinkedFiles;
+       cp->nBackgroundDeletions = dev->nBackgroundDeletions;
+       cp->sequenceNumber = dev->sequenceNumber;
+
+}
+
+static void yaffs2_CheckpointDeviceToDevice(yaffs_Device *dev,
+                                          yaffs_CheckpointDevice *cp)
+{
+       dev->nErasedBlocks = cp->nErasedBlocks;
+       dev->allocationBlock = cp->allocationBlock;
+       dev->allocationPage = cp->allocationPage;
+       dev->nFreeChunks = cp->nFreeChunks;
+
+       dev->nDeletedFiles = cp->nDeletedFiles;
+       dev->nUnlinkedFiles = cp->nUnlinkedFiles;
+       dev->nBackgroundDeletions = cp->nBackgroundDeletions;
+       dev->sequenceNumber = cp->sequenceNumber;
+}
+
+
+static int yaffs2_WriteCheckpointDevice(yaffs_Device *dev)
+{
+       yaffs_CheckpointDevice cp;
+       __u32 nBytes;
+       __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+       int ok;
+
+       /* Write device runtime values*/
+       yaffs2_DeviceToCheckpointDevice(&cp, dev);
+       cp.structType = sizeof(cp);
+
+       ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+       /* Write block info */
+       if (ok) {
+               nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+               ok = (yaffs2_CheckpointWrite(dev, dev->blockInfo, nBytes) == nBytes);
+       }
+
+       /* Write chunk bits */
+       if (ok) {
+               nBytes = nBlocks * dev->chunkBitmapStride;
+               ok = (yaffs2_CheckpointWrite(dev, dev->chunkBits, nBytes) == nBytes);
+       }
+       return   ok ? 1 : 0;
+
+}
+
+static int yaffs2_ReadCheckpointDevice(yaffs_Device *dev)
+{
+       yaffs_CheckpointDevice cp;
+       __u32 nBytes;
+       __u32 nBlocks = (dev->internalEndBlock - dev->internalStartBlock + 1);
+
+       int ok;
+
+       ok = (yaffs2_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+       if (!ok)
+               return 0;
+
+       if (cp.structType != sizeof(cp))
+               return 0;
+
+
+       yaffs2_CheckpointDeviceToDevice(dev, &cp);
+
+       nBytes = nBlocks * sizeof(yaffs_BlockInfo);
+
+       ok = (yaffs2_CheckpointRead(dev, dev->blockInfo, nBytes) == nBytes);
+
+       if (!ok)
+               return 0;
+       nBytes = nBlocks * dev->chunkBitmapStride;
+
+       ok = (yaffs2_CheckpointRead(dev, dev->chunkBits, nBytes) == nBytes);
+
+       return ok ? 1 : 0;
+}
+
+static void yaffs2_ObjectToCheckpointObject(yaffs_CheckpointObject *cp,
+                                          yaffs_Object *obj)
+{
+
+       cp->objectId = obj->objectId;
+       cp->parentId = (obj->parent) ? obj->parent->objectId : 0;
+       cp->hdrChunk = obj->hdrChunk;
+       cp->variantType = obj->variantType;
+       cp->deleted = obj->deleted;
+       cp->softDeleted = obj->softDeleted;
+       cp->unlinked = obj->unlinked;
+       cp->fake = obj->fake;
+       cp->renameAllowed = obj->renameAllowed;
+       cp->unlinkAllowed = obj->unlinkAllowed;
+       cp->serial = obj->serial;
+       cp->nDataChunks = obj->nDataChunks;
+
+       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+               cp->fileSizeOrEquivalentObjectId = obj->variant.fileVariant.fileSize;
+       else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+               cp->fileSizeOrEquivalentObjectId = obj->variant.hardLinkVariant.equivalentObjectId;
+}
+
+static int yaffs2_CheckpointObjectToObject(yaffs_Object *obj, yaffs_CheckpointObject *cp)
+{
+
+       yaffs_Object *parent;
+
+       if (obj->variantType != cp->variantType) {
+               T(YAFFS_TRACE_ERROR, (TSTR("Checkpoint read object %d type %d "
+                       TCONT("chunk %d does not match existing object type %d")
+                       TENDSTR), cp->objectId, cp->variantType, cp->hdrChunk,
+                       obj->variantType));
+               return 0;
+       }
+
+       obj->objectId = cp->objectId;
+
+       if (cp->parentId)
+               parent = yaffs_FindOrCreateObjectByNumber(
+                                       obj->myDev,
+                                       cp->parentId,
+                                       YAFFS_OBJECT_TYPE_DIRECTORY);
+       else
+               parent = NULL;
+
+       if (parent) {
+               if (parent->variantType != YAFFS_OBJECT_TYPE_DIRECTORY) {
+                       T(YAFFS_TRACE_ALWAYS, (TSTR("Checkpoint read object %d parent %d type %d"
+                               TCONT(" chunk %d Parent type, %d, not directory")
+                               TENDSTR),
+                               cp->objectId, cp->parentId, cp->variantType,
+                               cp->hdrChunk, parent->variantType));
+                       return 0;
+               }
+               yaffs_AddObjectToDirectory(parent, obj);
+       }
+
+       obj->hdrChunk = cp->hdrChunk;
+       obj->variantType = cp->variantType;
+       obj->deleted = cp->deleted;
+       obj->softDeleted = cp->softDeleted;
+       obj->unlinked = cp->unlinked;
+       obj->fake = cp->fake;
+       obj->renameAllowed = cp->renameAllowed;
+       obj->unlinkAllowed = cp->unlinkAllowed;
+       obj->serial = cp->serial;
+       obj->nDataChunks = cp->nDataChunks;
+
+       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+               obj->variant.fileVariant.fileSize = cp->fileSizeOrEquivalentObjectId;
+       else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK)
+               obj->variant.hardLinkVariant.equivalentObjectId = cp->fileSizeOrEquivalentObjectId;
+
+       if (obj->hdrChunk > 0)
+               obj->lazyLoaded = 1;
+       return 1;
+}
+
+
+
+static int yaffs2_CheckpointTnodeWorker(yaffs_Object *in, yaffs_Tnode *tn,
+                                       __u32 level, int chunkOffset)
+{
+       int i;
+       yaffs_Device *dev = in->myDev;
+       int ok = 1;
+
+       if (tn) {
+               if (level > 0) {
+
+                       for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
+                               if (tn->internal[i]) {
+                                       ok = yaffs2_CheckpointTnodeWorker(in,
+                                                       tn->internal[i],
+                                                       level - 1,
+                                                       (chunkOffset<<YAFFS_TNODES_INTERNAL_BITS) + i);
+                               }
+                       }
+               } else if (level == 0) {
+                       __u32 baseOffset = chunkOffset <<  YAFFS_TNODES_LEVEL0_BITS;
+                       ok = (yaffs2_CheckpointWrite(dev, &baseOffset, sizeof(baseOffset)) == sizeof(baseOffset));
+                       if (ok)
+                               ok = (yaffs2_CheckpointWrite(dev, tn, dev->tnodeSize) == dev->tnodeSize);
+               }
+       }
+
+       return ok;
+
+}
+
+static int yaffs2_WriteCheckpointTnodes(yaffs_Object *obj)
+{
+       __u32 endMarker = ~0;
+       int ok = 1;
+
+       if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+               ok = yaffs2_CheckpointTnodeWorker(obj,
+                                           obj->variant.fileVariant.top,
+                                           obj->variant.fileVariant.topLevel,
+                                           0);
+               if (ok)
+                       ok = (yaffs2_CheckpointWrite(obj->myDev, &endMarker, sizeof(endMarker)) ==
+                               sizeof(endMarker));
+       }
+
+       return ok ? 1 : 0;
+}
+
+static int yaffs2_ReadCheckpointTnodes(yaffs_Object *obj)
+{
+       __u32 baseChunk;
+       int ok = 1;
+       yaffs_Device *dev = obj->myDev;
+       yaffs_FileStructure *fileStructPtr = &obj->variant.fileVariant;
+       yaffs_Tnode *tn;
+       int nread = 0;
+
+       ok = (yaffs2_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+
+       while (ok && (~baseChunk)) {
+               nread++;
+               /* Read level 0 tnode */
+
+
+               tn = yaffs_GetTnode(dev);
+               if (tn){
+                       ok = (yaffs2_CheckpointRead(dev, tn, dev->tnodeSize) == dev->tnodeSize);
+               } else
+                       ok = 0;
+
+               if (tn && ok)
+                       ok = yaffs_AddOrFindLevel0Tnode(dev,
+                                                       fileStructPtr,
+                                                       baseChunk,
+                                                       tn) ? 1 : 0;
+
+               if (ok)
+                       ok = (yaffs2_CheckpointRead(dev, &baseChunk, sizeof(baseChunk)) == sizeof(baseChunk));
+
+       }
+
+       T(YAFFS_TRACE_CHECKPOINT, (
+               TSTR("Checkpoint read tnodes %d records, last %d. ok %d" TENDSTR),
+               nread, baseChunk, ok));
+
+       return ok ? 1 : 0;
+}
+
+
+static int yaffs2_WriteCheckpointObjects(yaffs_Device *dev)
+{
+       yaffs_Object *obj;
+       yaffs_CheckpointObject cp;
+       int i;
+       int ok = 1;
+       struct ylist_head *lh;
+
+
+       /* Iterate through the objects in each hash entry,
+        * dumping them to the checkpointing stream.
+        */
+
+       for (i = 0; ok &&  i <  YAFFS_NOBJECT_BUCKETS; i++) {
+               ylist_for_each(lh, &dev->objectBucket[i].list) {
+                       if (lh) {
+                               obj = ylist_entry(lh, yaffs_Object, hashLink);
+                               if (!obj->deferedFree) {
+                                       yaffs2_ObjectToCheckpointObject(&cp, obj);
+                                       cp.structType = sizeof(cp);
+
+                                       T(YAFFS_TRACE_CHECKPOINT, (
+                                               TSTR("Checkpoint write object %d parent %d type %d chunk %d obj addr %p" TENDSTR),
+                                               cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk, obj));
+
+                                       ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+                                       if (ok && obj->variantType == YAFFS_OBJECT_TYPE_FILE)
+                                               ok = yaffs2_WriteCheckpointTnodes(obj);
+                               }
+                       }
+               }
+       }
+
+       /* Dump end of list */
+       memset(&cp, 0xFF, sizeof(yaffs_CheckpointObject));
+       cp.structType = sizeof(cp);
+
+       if (ok)
+               ok = (yaffs2_CheckpointWrite(dev, &cp, sizeof(cp)) == sizeof(cp));
+
+       return ok ? 1 : 0;
+}
+
+static int yaffs2_ReadCheckpointObjects(yaffs_Device *dev)
+{
+       yaffs_Object *obj;
+       yaffs_CheckpointObject cp;
+       int ok = 1;
+       int done = 0;
+       yaffs_Object *hardList = NULL;
+
+       while (ok && !done) {
+               ok = (yaffs2_CheckpointRead(dev, &cp, sizeof(cp)) == sizeof(cp));
+               if (cp.structType != sizeof(cp)) {
+                       T(YAFFS_TRACE_CHECKPOINT, (TSTR("struct size %d instead of %d ok %d"TENDSTR),
+                               cp.structType, (int)sizeof(cp), ok));
+                       ok = 0;
+               }
+
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("Checkpoint read object %d parent %d type %d chunk %d " TENDSTR),
+                       cp.objectId, cp.parentId, cp.variantType, cp.hdrChunk));
+
+               if (ok && cp.objectId == ~0)
+                       done = 1;
+               else if (ok) {
+                       obj = yaffs_FindOrCreateObjectByNumber(dev, cp.objectId, cp.variantType);
+                       if (obj) {
+                               ok = yaffs2_CheckpointObjectToObject(obj, &cp);
+                               if (!ok)
+                                       break;
+                               if (obj->variantType == YAFFS_OBJECT_TYPE_FILE) {
+                                       ok = yaffs2_ReadCheckpointTnodes(obj);
+                               } else if (obj->variantType == YAFFS_OBJECT_TYPE_HARDLINK) {
+                                       obj->hardLinks.next =
+                                               (struct ylist_head *) hardList;
+                                       hardList = obj;
+                               }
+                       } else
+                               ok = 0;
+               }
+       }
+
+       if (ok)
+               yaffs_HardlinkFixup(dev, hardList);
+
+       return ok ? 1 : 0;
+}
+
+static int yaffs2_WriteCheckpointSum(yaffs_Device *dev)
+{
+       __u32 checkpointSum;
+       int ok;
+
+       yaffs2_GetCheckpointSum(dev, &checkpointSum);
+
+       ok = (yaffs2_CheckpointWrite(dev, &checkpointSum, sizeof(checkpointSum)) == sizeof(checkpointSum));
+
+       if (!ok)
+               return 0;
+
+       return 1;
+}
+
+static int yaffs2_ReadCheckpointSum(yaffs_Device *dev)
+{
+       __u32 checkpointSum0;
+       __u32 checkpointSum1;
+       int ok;
+
+       yaffs2_GetCheckpointSum(dev, &checkpointSum0);
+
+       ok = (yaffs2_CheckpointRead(dev, &checkpointSum1, sizeof(checkpointSum1)) == sizeof(checkpointSum1));
+
+       if (!ok)
+               return 0;
+
+       if (checkpointSum0 != checkpointSum1)
+               return 0;
+
+       return 1;
+}
+
+
+static int yaffs2_WriteCheckpointData(yaffs_Device *dev)
+{
+       int ok = 1;
+
+       if (!yaffs2_CheckpointRequired(dev)) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint write" TENDSTR)));
+               ok = 0;
+       }
+
+       if (ok)
+               ok = yaffs2_CheckpointOpen(dev, 1);
+
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+               ok = yaffs2_WriteCheckpointValidityMarker(dev, 1);
+       }
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint device" TENDSTR)));
+               ok = yaffs2_WriteCheckpointDevice(dev);
+       }
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint objects" TENDSTR)));
+               ok = yaffs2_WriteCheckpointObjects(dev);
+       }
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("write checkpoint validity" TENDSTR)));
+               ok = yaffs2_WriteCheckpointValidityMarker(dev, 0);
+       }
+
+       if (ok)
+               ok = yaffs2_WriteCheckpointSum(dev);
+
+       if (!yaffs2_CheckpointClose(dev))
+               ok = 0;
+
+       if (ok)
+               dev->isCheckpointed = 1;
+       else
+               dev->isCheckpointed = 0;
+
+       return dev->isCheckpointed;
+}
+
+static int yaffs2_ReadCheckpointData(yaffs_Device *dev)
+{
+       int ok = 1;
+       
+       if(!dev->param.isYaffs2)
+               ok = 0;
+
+       if (ok && dev->param.skipCheckpointRead) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("skipping checkpoint read" TENDSTR)));
+               ok = 0;
+       }
+
+       if (ok)
+               ok = yaffs2_CheckpointOpen(dev, 0); /* open for read */
+
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
+               ok = yaffs2_ReadCheckpointValidityMarker(dev, 1);
+       }
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint device" TENDSTR)));
+               ok = yaffs2_ReadCheckpointDevice(dev);
+       }
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint objects" TENDSTR)));
+               ok = yaffs2_ReadCheckpointObjects(dev);
+       }
+       if (ok) {
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint validity" TENDSTR)));
+               ok = yaffs2_ReadCheckpointValidityMarker(dev, 0);
+       }
+
+       if (ok) {
+               ok = yaffs2_ReadCheckpointSum(dev);
+               T(YAFFS_TRACE_CHECKPOINT, (TSTR("read checkpoint checksum %d" TENDSTR), ok));
+       }
+
+       if (!yaffs2_CheckpointClose(dev))
+               ok = 0;
+
+       if (ok)
+               dev->isCheckpointed = 1;
+       else
+               dev->isCheckpointed = 0;
+
+       return ok ? 1 : 0;
+
+}
+
+void yaffs2_InvalidateCheckpoint(yaffs_Device *dev)
+{
+       if (dev->isCheckpointed ||
+                       dev->blocksInCheckpoint > 0) {
+               dev->isCheckpointed = 0;
+               yaffs2_CheckpointInvalidateStream(dev);
+       }
+       if (dev->param.markSuperBlockDirty)
+               dev->param.markSuperBlockDirty(dev);
+}
+
+
+int yaffs_CheckpointSave(yaffs_Device *dev)
+{
+
+       T(YAFFS_TRACE_CHECKPOINT, (TSTR("save entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+       yaffs_VerifyObjects(dev);
+       yaffs_VerifyBlocks(dev);
+       yaffs_VerifyFreeChunks(dev);
+
+       if (!dev->isCheckpointed) {
+               yaffs2_InvalidateCheckpoint(dev);
+               yaffs2_WriteCheckpointData(dev);
+       }
+
+       T(YAFFS_TRACE_ALWAYS, (TSTR("save exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+       return dev->isCheckpointed;
+}
+
+int yaffs2_CheckpointRestore(yaffs_Device *dev)
+{
+       int retval;
+       T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore entry: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+       retval = yaffs2_ReadCheckpointData(dev);
+
+       if (dev->isCheckpointed) {
+               yaffs_VerifyObjects(dev);
+               yaffs_VerifyBlocks(dev);
+               yaffs_VerifyFreeChunks(dev);
+       }
+
+       T(YAFFS_TRACE_CHECKPOINT, (TSTR("restore exit: isCheckpointed %d"TENDSTR), dev->isCheckpointed));
+
+       return retval;
+}
+
+int yaffs2_HandleHole(yaffs_Object *obj, loff_t newSize)
+{
+       /* if newsSize > oldFileSize.
+        * We're going to be writing a hole.
+        * If the hole is small then write zeros otherwise write a start of hole marker.
+        */
+               
+
+       loff_t oldFileSize;
+       int increase;
+       int smallHole   ;
+       int result = YAFFS_OK;
+       yaffs_Device *dev = NULL;
+
+       __u8 *localBuffer = NULL;
+       
+       int smallIncreaseOk = 0;
+       
+       if(!obj)
+               return YAFFS_FAIL;
+
+       if(obj->variantType != YAFFS_OBJECT_TYPE_FILE)
+               return YAFFS_FAIL;
+       
+       dev = obj->myDev;
+       
+       /* Bail out if not yaffs2 mode */
+       if(!dev->param.isYaffs2)
+               return YAFFS_OK;
+
+       oldFileSize = obj->variant.fileVariant.fileSize;
+
+       if (newSize <= oldFileSize)
+               return YAFFS_OK;
+
+       increase = newSize - oldFileSize;
+
+       if(increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->nDataBytesPerChunk &&
+               yaffs_CheckSpaceForAllocation(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
+               smallHole = 1;
+       else
+               smallHole = 0;
+
+       if(smallHole)
+               localBuffer= yaffs_GetTempBuffer(dev, __LINE__);
+       
+       if(localBuffer){
+               /* fill hole with zero bytes */
+               int pos = oldFileSize;
+               int thisWrite;
+               int written;
+               memset(localBuffer,0,dev->nDataBytesPerChunk);
+               smallIncreaseOk = 1;
+
+               while(increase > 0 && smallIncreaseOk){
+                       thisWrite = increase;
+                       if(thisWrite > dev->nDataBytesPerChunk)
+                               thisWrite = dev->nDataBytesPerChunk;
+                       written = yaffs_DoWriteDataToFile(obj,localBuffer,pos,thisWrite,0);
+                       if(written == thisWrite){
+                               pos += thisWrite;
+                               increase -= thisWrite;
+                       } else
+                               smallIncreaseOk = 0;
+               }
+
+               yaffs_ReleaseTempBuffer(dev,localBuffer,__LINE__);
+
+               /* If we were out of space then reverse any chunks we've added */               
+               if(!smallIncreaseOk)
+                       yaffs_ResizeDown(obj, oldFileSize);
+       }
+       
+       if (!smallIncreaseOk &&
+               obj->parent &&
+               obj->parent->objectId != YAFFS_OBJECTID_UNLINKED &&
+               obj->parent->objectId != YAFFS_OBJECTID_DELETED){
+               /* Write a hole start header with the old file size */
+               yaffs_UpdateObjectHeader(obj, NULL, 0, 1, 0, NULL);
+       }
+
+       return result;
+
+}
+
+
+typedef struct {
+       int seq;
+       int block;
+} yaffs_BlockIndex;
+
+
+static int yaffs2_ybicmp(const void *a, const void *b)
+{
+       register int aseq = ((yaffs_BlockIndex *)a)->seq;
+       register int bseq = ((yaffs_BlockIndex *)b)->seq;
+       register int ablock = ((yaffs_BlockIndex *)a)->block;
+       register int bblock = ((yaffs_BlockIndex *)b)->block;
+       if (aseq == bseq)
+               return ablock - bblock;
+       else
+               return aseq - bseq;
+}
+
+int yaffs2_ScanBackwards(yaffs_Device *dev)
+{
+       yaffs_ExtendedTags tags;
+       int blk;
+       int blockIterator;
+       int startIterator;
+       int endIterator;
+       int nBlocksToScan = 0;
+
+       int chunk;
+       int result;
+       int c;
+       int deleted;
+       yaffs_BlockState state;
+       yaffs_Object *hardList = NULL;
+       yaffs_BlockInfo *bi;
+       __u32 sequenceNumber;
+       yaffs_ObjectHeader *oh;
+       yaffs_Object *in;
+       yaffs_Object *parent;
+       int nBlocks = dev->internalEndBlock - dev->internalStartBlock + 1;
+       int itsUnlinked;
+       __u8 *chunkData;
+
+       int fileSize;
+       int isShrink;
+       int foundChunksInBlock;
+       int equivalentObjectId;
+       int alloc_failed = 0;
+
+
+       yaffs_BlockIndex *blockIndex = NULL;
+       int altBlockIndex = 0;
+
+       T(YAFFS_TRACE_SCAN,
+         (TSTR
+          ("yaffs2_ScanBackwards starts  intstartblk %d intendblk %d..."
+           TENDSTR), dev->internalStartBlock, dev->internalEndBlock));
+
+
+       dev->sequenceNumber = YAFFS_LOWEST_SEQUENCE_NUMBER;
+
+       blockIndex = YMALLOC(nBlocks * sizeof(yaffs_BlockIndex));
+
+       if (!blockIndex) {
+               blockIndex = YMALLOC_ALT(nBlocks * sizeof(yaffs_BlockIndex));
+               altBlockIndex = 1;
+       }
+
+       if (!blockIndex) {
+               T(YAFFS_TRACE_SCAN,
+                 (TSTR("yaffs2_ScanBackwards() could not allocate block index!" TENDSTR)));
+               return YAFFS_FAIL;
+       }
+
+       dev->blocksInCheckpoint = 0;
+
+       chunkData = yaffs_GetTempBuffer(dev, __LINE__);
+
+       /* Scan all the blocks to determine their state */
+       bi = dev->blockInfo;
+       for (blk = dev->internalStartBlock; blk <= dev->internalEndBlock; blk++) {
+               yaffs_ClearChunkBits(dev, blk);
+               bi->pagesInUse = 0;
+               bi->softDeletions = 0;
+
+               yaffs_QueryInitialBlockState(dev, blk, &state, &sequenceNumber);
+
+               bi->blockState = state;
+               bi->sequenceNumber = sequenceNumber;
+
+               if (bi->sequenceNumber == YAFFS_SEQUENCE_CHECKPOINT_DATA)
+                       bi->blockState = state = YAFFS_BLOCK_STATE_CHECKPOINT;
+               if (bi->sequenceNumber == YAFFS_SEQUENCE_BAD_BLOCK)
+                       bi->blockState = state = YAFFS_BLOCK_STATE_DEAD;
+
+               T(YAFFS_TRACE_SCAN_DEBUG,
+                 (TSTR("Block scanning block %d state %d seq %d" TENDSTR), blk,
+                  state, sequenceNumber));
+
+
+               if (state == YAFFS_BLOCK_STATE_CHECKPOINT) {
+                       dev->blocksInCheckpoint++;
+
+               } else if (state == YAFFS_BLOCK_STATE_DEAD) {
+                       T(YAFFS_TRACE_BAD_BLOCKS,
+                         (TSTR("block %d is bad" TENDSTR), blk));
+               } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
+                       T(YAFFS_TRACE_SCAN_DEBUG,
+                         (TSTR("Block empty " TENDSTR)));
+                       dev->nErasedBlocks++;
+                       dev->nFreeChunks += dev->param.nChunksPerBlock;
+               } else if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+
+                       /* Determine the highest sequence number */
+                       if (sequenceNumber >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
+                           sequenceNumber < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
+
+                               blockIndex[nBlocksToScan].seq = sequenceNumber;
+                               blockIndex[nBlocksToScan].block = blk;
+
+                               nBlocksToScan++;
+
+                               if (sequenceNumber >= dev->sequenceNumber)
+                                       dev->sequenceNumber = sequenceNumber;
+                       } else {
+                               /* TODO: Nasty sequence number! */
+                               T(YAFFS_TRACE_SCAN,
+                                 (TSTR
+                                  ("Block scanning block %d has bad sequence number %d"
+                                   TENDSTR), blk, sequenceNumber));
+
+                       }
+               }
+               bi++;
+       }
+
+       T(YAFFS_TRACE_SCAN,
+       (TSTR("%d blocks to be sorted..." TENDSTR), nBlocksToScan));
+
+
+
+       YYIELD();
+
+       /* Sort the blocks by sequence number*/
+       yaffs_qsort(blockIndex, nBlocksToScan, sizeof(yaffs_BlockIndex), yaffs2_ybicmp);
+
+       YYIELD();
+
+       T(YAFFS_TRACE_SCAN, (TSTR("...done" TENDSTR)));
+
+       /* Now scan the blocks looking at the data. */
+       startIterator = 0;
+       endIterator = nBlocksToScan - 1;
+       T(YAFFS_TRACE_SCAN_DEBUG,
+         (TSTR("%d blocks to be scanned" TENDSTR), nBlocksToScan));
+
+       /* For each block.... backwards */
+       for (blockIterator = endIterator; !alloc_failed && blockIterator >= startIterator;
+                       blockIterator--) {
+               /* Cooperative multitasking! This loop can run for so
+                  long that watchdog timers expire. */
+               YYIELD();
+
+               /* get the block to scan in the correct order */
+               blk = blockIndex[blockIterator].block;
+
+               bi = yaffs_GetBlockInfo(dev, blk);
+
+
+               state = bi->blockState;
+
+               deleted = 0;
+
+               /* For each chunk in each block that needs scanning.... */
+               foundChunksInBlock = 0;
+               for (c = dev->param.nChunksPerBlock - 1;
+                    !alloc_failed && c >= 0 &&
+                    (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+                     state == YAFFS_BLOCK_STATE_ALLOCATING); c--) {
+                       /* Scan backwards...
+                        * Read the tags and decide what to do
+                        */
+
+                       chunk = blk * dev->param.nChunksPerBlock + c;
+
+                       result = yaffs_ReadChunkWithTagsFromNAND(dev, chunk, NULL,
+                                                       &tags);
+
+                       /* Let's have a good look at this chunk... */
+
+                       if (!tags.chunkUsed) {
+                               /* An unassigned chunk in the block.
+                                * If there are used chunks after this one, then
+                                * it is a chunk that was skipped due to failing the erased
+                                * check. Just skip it so that it can be deleted.
+                                * But, more typically, We get here when this is an unallocated
+                                * chunk and his means that either the block is empty or
+                                * this is the one being allocated from
+                                */
+
+                               if (foundChunksInBlock) {
+                                       /* This is a chunk that was skipped due to failing the erased check */
+                               } else if (c == 0) {
+                                       /* We're looking at the first chunk in the block so the block is unused */
+                                       state = YAFFS_BLOCK_STATE_EMPTY;
+                                       dev->nErasedBlocks++;
+                               } else {
+                                       if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING ||
+                                           state == YAFFS_BLOCK_STATE_ALLOCATING) {
+                                               if (dev->sequenceNumber == bi->sequenceNumber) {
+                                                       /* this is the block being allocated from */
+
+                                                       T(YAFFS_TRACE_SCAN,
+                                                         (TSTR
+                                                          (" Allocating from %d %d"
+                                                           TENDSTR), blk, c));
+
+                                                       state = YAFFS_BLOCK_STATE_ALLOCATING;
+                                                       dev->allocationBlock = blk;
+                                                       dev->allocationPage = c;
+                                                       dev->allocationBlockFinder = blk;
+                                               } else {
+                                                       /* This is a partially written block that is not
+                                                        * the current allocation block.
+                                                        */
+
+                                                        T(YAFFS_TRACE_SCAN,
+                                                        (TSTR("Partially written block %d detected" TENDSTR),
+                                                        blk));
+                                               }
+                                       }
+                               }
+
+                               dev->nFreeChunks++;
+
+                       } else if (tags.eccResult == YAFFS_ECC_RESULT_UNFIXED) {
+                               T(YAFFS_TRACE_SCAN,
+                                 (TSTR(" Unfixed ECC in chunk(%d:%d), chunk ignored"TENDSTR),
+                                 blk, c));
+
+                                 dev->nFreeChunks++;
+
+                       } else if (tags.objectId > YAFFS_MAX_OBJECT_ID ||
+                               tags.chunkId > YAFFS_MAX_CHUNK_ID ||
+                               (tags.chunkId > 0 && tags.byteCount > dev->nDataBytesPerChunk) ||
+                               tags.sequenceNumber != bi->sequenceNumber ) {
+                               T(YAFFS_TRACE_SCAN,
+                                 (TSTR("Chunk (%d:%d) with bad tags:obj = %d, chunkId = %d, byteCount = %d, ignored"TENDSTR),
+                                 blk, c,tags.objectId, tags.chunkId, tags.byteCount));
+
+                                 dev->nFreeChunks++;
+
+                       } else if (tags.chunkId > 0) {
+                               /* chunkId > 0 so it is a data chunk... */
+                               unsigned int endpos;
+                               __u32 chunkBase =
+                                   (tags.chunkId - 1) * dev->nDataBytesPerChunk;
+
+                               foundChunksInBlock = 1;
+
+
+                               yaffs_SetChunkBit(dev, blk, c);
+                               bi->pagesInUse++;
+
+                               in = yaffs_FindOrCreateObjectByNumber(dev,
+                                                                     tags.
+                                                                     objectId,
+                                                                     YAFFS_OBJECT_TYPE_FILE);
+                               if (!in) {
+                                       /* Out of memory */
+                                       alloc_failed = 1;
+                               }
+
+                               if (in &&
+                                   in->variantType == YAFFS_OBJECT_TYPE_FILE
+                                   && chunkBase < in->variant.fileVariant.shrinkSize) {
+                                       /* This has not been invalidated by a resize */
+                                       if (!yaffs_PutChunkIntoFile(in, tags.chunkId, chunk, -1)) {
+                                               alloc_failed = 1;
+                                       }
+
+                                       /* File size is calculated by looking at the data chunks if we have not
+                                        * seen an object header yet. Stop this practice once we find an object header.
+                                        */
+                                       endpos = chunkBase + tags.byteCount;
+
+                                       if (!in->valid &&       /* have not got an object header yet */
+                                           in->variant.fileVariant.scannedFileSize < endpos) {
+                                               in->variant.fileVariant.scannedFileSize = endpos;
+                                               in->variant.fileVariant.fileSize = endpos;
+                                       }
+
+                               } else if (in) {
+                                       /* This chunk has been invalidated by a resize, or a past file deletion
+                                        * so delete the chunk*/
+                                       yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+                               }
+                       } else {
+                               /* chunkId == 0, so it is an ObjectHeader.
+                                * Thus, we read in the object header and make the object
+                                */
+                               foundChunksInBlock = 1;
+
+                               yaffs_SetChunkBit(dev, blk, c);
+                               bi->pagesInUse++;
+
+                               oh = NULL;
+                               in = NULL;
+
+                               if (tags.extraHeaderInfoAvailable) {
+                                       in = yaffs_FindOrCreateObjectByNumber(dev,
+                                               tags.objectId,
+                                               tags.extraObjectType);
+                                       if (!in)
+                                               alloc_failed = 1;
+                               }
+
+                               if (!in ||
+                                   (!in->valid && dev->param.disableLazyLoad) ||
+                                   tags.extraShadows ||
+                                   (!in->valid &&
+                                   (tags.objectId == YAFFS_OBJECTID_ROOT ||
+                                    tags.objectId == YAFFS_OBJECTID_LOSTNFOUND))) {
+
+                                       /* If we don't have  valid info then we need to read the chunk
+                                        * TODO In future we can probably defer reading the chunk and
+                                        * living with invalid data until needed.
+                                        */
+
+                                       result = yaffs_ReadChunkWithTagsFromNAND(dev,
+                                                                       chunk,
+                                                                       chunkData,
+                                                                       NULL);
+
+                                       oh = (yaffs_ObjectHeader *) chunkData;
+
+                                       if (dev->param.inbandTags) {
+                                               /* Fix up the header if they got corrupted by inband tags */
+                                               oh->shadowsObject = oh->inbandShadowsObject;
+                                               oh->isShrink = oh->inbandIsShrink;
+                                       }
+
+                                       if (!in) {
+                                               in = yaffs_FindOrCreateObjectByNumber(dev, tags.objectId, oh->type);
+                                               if (!in)
+                                                       alloc_failed = 1;
+                                       }
+
+                               }
+
+                               if (!in) {
+                                       /* TODO Hoosterman we have a problem! */
+                                       T(YAFFS_TRACE_ERROR,
+                                         (TSTR
+                                          ("yaffs tragedy: Could not make object for object  %d at chunk %d during scan"
+                                           TENDSTR), tags.objectId, chunk));
+                                       continue;
+                               }
+
+                               if (in->valid) {
+                                       /* We have already filled this one.
+                                        * We have a duplicate that will be discarded, but
+                                        * we first have to suck out resize info if it is a file.
+                                        */
+
+                                       if ((in->variantType == YAFFS_OBJECT_TYPE_FILE) &&
+                                            ((oh &&
+                                              oh->type == YAFFS_OBJECT_TYPE_FILE) ||
+                                             (tags.extraHeaderInfoAvailable  &&
+                                              tags.extraObjectType == YAFFS_OBJECT_TYPE_FILE))) {
+                                               __u32 thisSize =
+                                                   (oh) ? oh->fileSize : tags.
+                                                   extraFileLength;
+                                               __u32 parentObjectId =
+                                                   (oh) ? oh->
+                                                   parentObjectId : tags.
+                                                   extraParentObjectId;
+
+
+                                               isShrink =
+                                                   (oh) ? oh->isShrink : tags.
+                                                   extraIsShrinkHeader;
+
+                                               /* If it is deleted (unlinked at start also means deleted)
+                                                * we treat the file size as being zeroed at this point.
+                                                */
+                                               if (parentObjectId ==
+                                                   YAFFS_OBJECTID_DELETED
+                                                   || parentObjectId ==
+                                                   YAFFS_OBJECTID_UNLINKED) {
+                                                       thisSize = 0;
+                                                       isShrink = 1;
+                                               }
+
+                                               if (isShrink && in->variant.fileVariant.shrinkSize > thisSize)
+                                                       in->variant.fileVariant.shrinkSize = thisSize;
+
+                                               if (isShrink)
+                                                       bi->hasShrinkHeader = 1;
+
+                                       }
+                                       /* Use existing - destroy this one. */
+                                       yaffs_DeleteChunk(dev, chunk, 1, __LINE__);
+
+                               }
+
+                               if (!in->valid && in->variantType !=
+                                   (oh ? oh->type : tags.extraObjectType))
+                                       T(YAFFS_TRACE_ERROR, (
+                                               TSTR("yaffs tragedy: Bad object type, "
+                                           TCONT("%d != %d, for object %d at chunk ")
+                                           TCONT("%d during scan")
+                                               TENDSTR), oh ?
+                                           oh->type : tags.extraObjectType,
+                                           in->variantType, tags.objectId,
+                                           chunk));
+
+                               if (!in->valid &&
+                                   (tags.objectId == YAFFS_OBJECTID_ROOT ||
+                                    tags.objectId ==
+                                    YAFFS_OBJECTID_LOSTNFOUND)) {
+                                       /* We only load some info, don't fiddle with directory structure */
+                                       in->valid = 1;
+
+                                       if (oh) {
+
+                                               in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+                                               in->win_atime[0] = oh->win_atime[0];
+                                               in->win_ctime[0] = oh->win_ctime[0];
+                                               in->win_mtime[0] = oh->win_mtime[0];
+                                               in->win_atime[1] = oh->win_atime[1];
+                                               in->win_ctime[1] = oh->win_ctime[1];
+                                               in->win_mtime[1] = oh->win_mtime[1];
+#else
+                                               in->yst_uid = oh->yst_uid;
+                                               in->yst_gid = oh->yst_gid;
+                                               in->yst_atime = oh->yst_atime;
+                                               in->yst_mtime = oh->yst_mtime;
+                                               in->yst_ctime = oh->yst_ctime;
+                                               in->yst_rdev = oh->yst_rdev;
+
+                                               in->lazyLoaded = 0;
+
+#endif
+                                       } else
+                                               in->lazyLoaded = 1;
+
+                                       in->hdrChunk = chunk;
+
+                               } else if (!in->valid) {
+                                       /* we need to load this info */
+
+                                       in->valid = 1;
+                                       in->hdrChunk = chunk;
+
+                                       if (oh) {
+                                               in->variantType = oh->type;
+
+                                               in->yst_mode = oh->yst_mode;
+#ifdef CONFIG_YAFFS_WINCE
+                                               in->win_atime[0] = oh->win_atime[0];
+                                               in->win_ctime[0] = oh->win_ctime[0];
+                                               in->win_mtime[0] = oh->win_mtime[0];
+                                               in->win_atime[1] = oh->win_atime[1];
+                                               in->win_ctime[1] = oh->win_ctime[1];
+                                               in->win_mtime[1] = oh->win_mtime[1];
+#else
+                                               in->yst_uid = oh->yst_uid;
+                                               in->yst_gid = oh->yst_gid;
+                                               in->yst_atime = oh->yst_atime;
+                                               in->yst_mtime = oh->yst_mtime;
+                                               in->yst_ctime = oh->yst_ctime;
+                                               in->yst_rdev = oh->yst_rdev;
+#endif
+
+                                               if (oh->shadowsObject > 0)
+                                                       yaffs_HandleShadowedObject(dev,
+                                                                          oh->
+                                                                          shadowsObject,
+                                                                          1);
+                                                       
+
+
+                                               yaffs_SetObjectNameFromOH(in, oh);
+                                               parent =
+                                                   yaffs_FindOrCreateObjectByNumber
+                                                       (dev, oh->parentObjectId,
+                                                        YAFFS_OBJECT_TYPE_DIRECTORY);
+
+                                                fileSize = oh->fileSize;
+                                                isShrink = oh->isShrink;
+                                                equivalentObjectId = oh->equivalentObjectId;
+
+                                       } else {
+                                               in->variantType = tags.extraObjectType;
+                                               parent =
+                                                   yaffs_FindOrCreateObjectByNumber
+                                                       (dev, tags.extraParentObjectId,
+                                                        YAFFS_OBJECT_TYPE_DIRECTORY);
+                                                fileSize = tags.extraFileLength;
+                                                isShrink = tags.extraIsShrinkHeader;
+                                                equivalentObjectId = tags.extraEquivalentObjectId;
+                                               in->lazyLoaded = 1;
+
+                                       }
+                                       in->dirty = 0;
+
+                                       if (!parent)
+                                               alloc_failed = 1;
+
+                                       /* directory stuff...
+                                        * hook up to parent
+                                        */
+
+                                       if (parent && parent->variantType ==
+                                           YAFFS_OBJECT_TYPE_UNKNOWN) {
+                                               /* Set up as a directory */
+                                               parent->variantType =
+                                                       YAFFS_OBJECT_TYPE_DIRECTORY;
+                                               YINIT_LIST_HEAD(&parent->variant.
+                                                       directoryVariant.
+                                                       children);
+                                       } else if (!parent || parent->variantType !=
+                                                  YAFFS_OBJECT_TYPE_DIRECTORY) {
+                                               /* Hoosterman, another problem....
+                                                * We're trying to use a non-directory as a directory
+                                                */
+
+                                               T(YAFFS_TRACE_ERROR,
+                                                 (TSTR
+                                                  ("yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
+                                                   TENDSTR)));
+                                               parent = dev->lostNFoundDir;
+                                       }
+
+                                       yaffs_AddObjectToDirectory(parent, in);
+
+                                       itsUnlinked = (parent == dev->deletedDir) ||
+                                                     (parent == dev->unlinkedDir);
+
+                                       if (isShrink) {
+                                               /* Mark the block as having a shrinkHeader */
+                                               bi->hasShrinkHeader = 1;
+                                       }
+
+                                       /* Note re hardlinks.
+                                        * Since we might scan a hardlink before its equivalent object is scanned
+                                        * we put them all in a list.
+                                        * After scanning is complete, we should have all the objects, so we run
+                                        * through this list and fix up all the chains.
+                                        */
+
+                                       switch (in->variantType) {
+                                       case YAFFS_OBJECT_TYPE_UNKNOWN:
+                                               /* Todo got a problem */
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_FILE:
+
+                                               if (in->variant.fileVariant.
+                                                   scannedFileSize < fileSize) {
+                                                       /* This covers the case where the file size is greater
+                                                        * than where the data is
+                                                        * This will happen if the file is resized to be larger
+                                                        * than its current data extents.
+                                                        */
+                                                       in->variant.fileVariant.fileSize = fileSize;
+                                                       in->variant.fileVariant.scannedFileSize = fileSize;
+                                               }
+
+                                               if (in->variant.fileVariant.shrinkSize > fileSize)
+                                                       in->variant.fileVariant.shrinkSize = fileSize;
+                               
+
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_HARDLINK:
+                                               if (!itsUnlinked) {
+                                                       in->variant.hardLinkVariant.equivalentObjectId =
+                                                               equivalentObjectId;
+                                                       in->hardLinks.next =
+                                                               (struct ylist_head *) hardList;
+                                                       hardList = in;
+                                               }
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_DIRECTORY:
+                                               /* Do nothing */
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_SPECIAL:
+                                               /* Do nothing */
+                                               break;
+                                       case YAFFS_OBJECT_TYPE_SYMLINK:
+                                               if (oh) {
+                                                       in->variant.symLinkVariant.alias =
+                                                               yaffs_CloneString(oh->alias);
+                                                       if (!in->variant.symLinkVariant.alias)
+                                                               alloc_failed = 1;
+                                               }
+                                               break;
+                                       }
+
+                               }
+
+                       }
+
+               } /* End of scanning for each chunk */
+
+               if (state == YAFFS_BLOCK_STATE_NEEDS_SCANNING) {
+                       /* If we got this far while scanning, then the block is fully allocated. */
+                       state = YAFFS_BLOCK_STATE_FULL;
+               }
+
+
+               bi->blockState = state;
+
+               /* Now let's see if it was dirty */
+               if (bi->pagesInUse == 0 &&
+                   !bi->hasShrinkHeader &&
+                   bi->blockState == YAFFS_BLOCK_STATE_FULL) {
+                       yaffs_BlockBecameDirty(dev, blk);
+               }
+
+       }
+       
+       yaffs_SkipRestOfBlock(dev);
+
+       if (altBlockIndex)
+               YFREE_ALT(blockIndex);
+       else
+               YFREE(blockIndex);
+
+       /* Ok, we've done all the scanning.
+        * Fix up the hard link chains.
+        * We should now have scanned all the objects, now it's time to add these
+        * hardlinks.
+        */
+       yaffs_HardlinkFixup(dev, hardList);
+
+
+       yaffs_ReleaseTempBuffer(dev, chunkData, __LINE__);
+
+       if (alloc_failed)
+               return YAFFS_FAIL;
+
+       T(YAFFS_TRACE_SCAN, (TSTR("yaffs2_ScanBackwards ends" TENDSTR)));
+
+       return YAFFS_OK;
+}
--- /dev/null
+++ b/fs/yaffs2/yaffs_yaffs2.h
@@ -0,0 +1,36 @@
+/*
+ * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
+ *
+ * Copyright (C) 2002-2010 Aleph One Ltd.
+ *   for Toby Churchill Ltd and Brightstar Engineering
+ *
+ * Created by Charles Manning <charles@aleph1.co.uk>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+
+#ifndef __YAFFS_YAFFS2_H__
+#define __YAFFS_YAFFS2_H__
+
+#include "yaffs_guts.h"
+
+void yaffs2_CalcOldestDirtySequence(yaffs_Device *dev);
+void yaffs2_FindOldestDirtySequence(yaffs_Device *dev);
+void yaffs2_ClearOldestDirtySequence(yaffs_Device *dev, yaffs_BlockInfo *bi);
+void yaffs2_UpdateOldestDirtySequence(yaffs_Device *dev, unsigned blockNo, yaffs_BlockInfo *bi);
+int yaffs2_BlockNotDisqualifiedFromGC(yaffs_Device *dev, yaffs_BlockInfo *bi);
+__u32 yaffs2_FindRefreshBlock(yaffs_Device *dev);
+int yaffs2_CheckpointRequired(yaffs_Device *dev);
+int yaffs2_CalcCheckpointBlocksRequired(yaffs_Device *dev);
+
+
+void yaffs2_InvalidateCheckpoint(yaffs_Device *dev);
+int yaffs2_CheckpointSave(yaffs_Device *dev);
+int yaffs2_CheckpointRestore(yaffs_Device *dev);
+
+int yaffs2_HandleHole(yaffs_Object *obj, loff_t newSize);
+int yaffs2_ScanBackwards(yaffs_Device *dev);
+
+#endif
--- a/fs/yaffs2/yportenv.h
+++ b/fs/yaffs2/yportenv.h
@@ -1,7 +1,7 @@
 /*
  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
  *
- * Copyright (C) 2002-2007 Aleph One Ltd.
+ * Copyright (C) 2002-2010 Aleph One Ltd.
  *   for Toby Churchill Ltd and Brightstar Engineering
  *
  * Created by Charles Manning <charles@aleph1.co.uk>
@@ -41,12 +41,14 @@
 #if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
 #include <linux/config.h>
 #endif
+
 #include <linux/kernel.h>
 #include <linux/mm.h>
 #include <linux/sched.h>
 #include <linux/string.h>
 #include <linux/slab.h>
 #include <linux/vmalloc.h>
+#include <linux/xattr.h>
 
 #define YCHAR char
 #define YUCHAR unsigned char
@@ -55,11 +57,11 @@
 #define yaffs_strcpy(a, b)     strcpy(a, b)
 #define yaffs_strncpy(a, b, c) strncpy(a, b, c)
 #define yaffs_strncmp(a, b, c) strncmp(a, b, c)
-#define yaffs_strlen(s)               strlen(s)
+#define yaffs_strnlen(s,m)     strnlen(s,m)
 #define yaffs_sprintf         sprintf
 #define yaffs_toupper(a)       toupper(a)
 
-#define Y_INLINE inline
+#define Y_INLINE __inline__
 
 #define YAFFS_LOSTNFOUND_NAME          "lost+found"
 #define YAFFS_LOSTNFOUND_PREFIX                "obj"
@@ -71,11 +73,11 @@
 #define YFREE_ALT(x)   vfree(x)
 #define YMALLOC_DMA(x) YMALLOC(x)
 
-/* KR - added for use in scan so processes aren't blocked indefinitely. */
 #define YYIELD() schedule()
+#define Y_DUMP_STACK() dump_stack()
 
-#define YAFFS_ROOT_MODE                        0666
-#define YAFFS_LOSTNFOUND_MODE          0666
+#define YAFFS_ROOT_MODE                        0755
+#define YAFFS_LOSTNFOUND_MODE          0700
 
 #if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
 #define Y_CURRENT_TIME CURRENT_TIME.tv_sec
@@ -89,15 +91,10 @@
 #define yaffs_strcmp(a, b) strcmp(a, b)
 
 #define TENDSTR "\n"
-#define TSTR(x) KERN_WARNING x
+#define TSTR(x) KERN_DEBUG x
 #define TCONT(x) x
 #define TOUT(p) printk p
 
-#define yaffs_trace(mask, fmt, args...) \
-       do { if ((mask) & (yaffs_traceMask|YAFFS_TRACE_ERROR)) \
-               printk(KERN_WARNING "yaffs: " fmt, ## args); \
-       } while (0)
-
 #define compile_time_assertion(assertion) \
        ({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
 
@@ -116,7 +113,6 @@
 #include "stdio.h"
 #include "string.h"
 
-#include "devextras.h"
 
 #define YMALLOC(x) malloc(x)
 #define YFREE(x)   free(x)
@@ -129,7 +125,7 @@
 #define yaffs_strcat(a, b)     strcat(a, b)
 #define yaffs_strcpy(a, b)     strcpy(a, b)
 #define yaffs_strncpy(a, b, c) strncpy(a, b, c)
-#define yaffs_strlen(s)               strlen(s)
+#define yaffs_strnlen(s,m)            strnlen(s,m)
 #define yaffs_sprintf         sprintf
 #define yaffs_toupper(a)       toupper(a)
 
@@ -146,8 +142,8 @@
 #define YAFFS_LOSTNFOUND_PREFIX                "obj"
 /* #define YPRINTF(x) printf x */
 
-#define YAFFS_ROOT_MODE                                0666
-#define YAFFS_LOSTNFOUND_MODE          0666
+#define YAFFS_ROOT_MODE                        0755
+#define YAFFS_LOSTNFOUND_MODE          0700
 
 #define yaffs_SumCompare(x, y) ((x) == (y))
 #define yaffs_strcmp(a, b) strcmp(a, b)
@@ -158,46 +154,180 @@
 
 #endif
 
-/* see yaffs_fs.c */
-extern unsigned int yaffs_traceMask;
-extern unsigned int yaffs_wr_attempts;
+#if defined(CONFIG_YAFFS_DIRECT) || defined(CONFIG_YAFFS_WINCE)
 
-/*
- * Tracing flags.
- * The flags masked in YAFFS_TRACE_ALWAYS are always traced.
- */
+#ifdef CONFIG_YAFFSFS_PROVIDE_VALUES
+
+#ifndef O_RDONLY
+#define O_RDONLY        00
+#endif
+
+#ifndef O_WRONLY
+#define O_WRONLY       01
+#endif
+
+#ifndef O_RDWR
+#define O_RDWR         02
+#endif
+
+#ifndef O_CREAT                
+#define O_CREAT        0100
+#endif
+
+#ifndef O_EXCL
+#define O_EXCL         0200
+#endif
+
+#ifndef O_TRUNC
+#define O_TRUNC                01000
+#endif
+
+#ifndef O_APPEND
+#define O_APPEND       02000
+#endif
+
+#ifndef SEEK_SET
+#define SEEK_SET       0
+#endif
+
+#ifndef SEEK_CUR
+#define SEEK_CUR       1
+#endif
+
+#ifndef SEEK_END
+#define SEEK_END       2
+#endif
+
+#ifndef EBUSY
+#define EBUSY  16
+#endif
+
+#ifndef ENODEV
+#define ENODEV 19
+#endif
+
+#ifndef EINVAL
+#define EINVAL 22
+#endif
+
+#ifndef EBADF
+#define EBADF  9
+#endif
+
+#ifndef EACCES
+#define EACCES 13
+#endif
+
+#ifndef EXDEV  
+#define EXDEV  18
+#endif
+
+#ifndef ENOENT
+#define ENOENT 2
+#endif
+
+#ifndef ENOSPC
+#define ENOSPC 28
+#endif
+
+#ifndef ERANGE
+#define ERANGE 34
+#endif
+
+#ifndef ENODATA
+#define ENODATA 61
+#endif
+
+#ifndef ENOTEMPTY
+#define ENOTEMPTY 39
+#endif
+
+#ifndef ENAMETOOLONG
+#define ENAMETOOLONG 36
+#endif
+
+#ifndef ENOMEM
+#define ENOMEM 12
+#endif
+
+#ifndef EEXIST
+#define EEXIST 17
+#endif
+
+#ifndef ENOTDIR
+#define ENOTDIR 20
+#endif
+
+#ifndef EISDIR
+#define EISDIR 21
+#endif
+
+
+// Mode flags
+
+#ifndef S_IFMT
+#define S_IFMT         0170000
+#endif
+
+#ifndef S_IFLNK
+#define S_IFLNK                0120000
+#endif
 
-#define YAFFS_TRACE_OS                 0x00000002
-#define YAFFS_TRACE_ALLOCATE           0x00000004
-#define YAFFS_TRACE_SCAN               0x00000008
-#define YAFFS_TRACE_BAD_BLOCKS         0x00000010
-#define YAFFS_TRACE_ERASE              0x00000020
-#define YAFFS_TRACE_GC                 0x00000040
-#define YAFFS_TRACE_WRITE              0x00000080
-#define YAFFS_TRACE_TRACING            0x00000100
-#define YAFFS_TRACE_DELETION           0x00000200
-#define YAFFS_TRACE_BUFFERS            0x00000400
-#define YAFFS_TRACE_NANDACCESS         0x00000800
-#define YAFFS_TRACE_GC_DETAIL          0x00001000
-#define YAFFS_TRACE_SCAN_DEBUG         0x00002000
-#define YAFFS_TRACE_MTD                        0x00004000
-#define YAFFS_TRACE_CHECKPOINT         0x00008000
-
-#define YAFFS_TRACE_VERIFY             0x00010000
-#define YAFFS_TRACE_VERIFY_NAND                0x00020000
-#define YAFFS_TRACE_VERIFY_FULL                0x00040000
-#define YAFFS_TRACE_VERIFY_ALL         0x000F0000
-
-
-#define YAFFS_TRACE_ERROR              0x40000000
-#define YAFFS_TRACE_BUG                        0x80000000
-#define YAFFS_TRACE_ALWAYS             0xF0000000
+#ifndef S_IFDIR
+#define S_IFDIR                0040000
+#endif
+
+#ifndef S_IFREG
+#define S_IFREG                0100000
+#endif
 
+#ifndef S_IREAD 
+#define S_IREAD                0000400
+#endif
+
+#ifndef S_IWRITE
+#define        S_IWRITE        0000200
+#endif
 
-#define T(mask, p) do { if ((mask) & (yaffs_traceMask | YAFFS_TRACE_ALWAYS)) TOUT(p); } while (0)
+#ifndef S_IEXEC
+#define        S_IEXEC 0000100
+#endif
+
+#ifndef XATTR_CREATE
+#define XATTR_CREATE 1
+#endif
+
+#ifndef XATTR_REPLACE
+#define XATTR_REPLACE 2
+#endif
+
+#ifndef R_OK
+#define R_OK   4
+#define W_OK   2
+#define X_OK   1
+#define F_OK   0
+#endif
+
+#else
+#include <errno.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#endif
+
+#endif
+
+#ifndef Y_DUMP_STACK
+#define Y_DUMP_STACK() do { } while (0)
+#endif
 
 #ifndef YBUG
-#define YBUG() do {T(YAFFS_TRACE_BUG, (TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR), __LINE__)); } while (0)
+#define YBUG() do {\
+       T(YAFFS_TRACE_BUG,\
+               (TSTR("==>> yaffs bug: " __FILE__ " %d" TENDSTR),\
+               __LINE__));\
+       Y_DUMP_STACK();\
+} while (0)
 #endif
 
+
 #endif