# CONFIG_XZ_DEC_SPARC is not set
# CONFIG_XZ_DEC_TEST is not set
# CONFIG_XZ_DEC_X86 is not set
-# CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING is not set
-# CONFIG_YAFFS_FS is not set
# CONFIG_YAM is not set
# CONFIG_YELLOWFIN is not set
# CONFIG_YENTA is not set
# CONFIG_XZ_DEC_SPARC is not set
# CONFIG_XZ_DEC_TEST is not set
# CONFIG_XZ_DEC_X86 is not set
-# CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING is not set
-# CONFIG_YAFFS_FS is not set
# CONFIG_YAM is not set
# CONFIG_YELLOWFIN is not set
# CONFIG_YENTA is not set
+++ /dev/null
-#
-# yaffs file system configurations
-#
-
-config YAFFS_FS
- tristate "yaffs2 file system support"
- default n
- depends on MTD_BLOCK
- select YAFFS_YAFFS1
- select YAFFS_YAFFS2
- help
- yaffs2, or Yet Another Flash File System, is a file system
- optimised for NAND Flash chips.
-
- To compile the yaffs2 file system support as a module, choose M
- here: the module will be called yaffs2.
-
- If unsure, say N.
-
- Further information on yaffs2 is available at
- <http://www.aleph1.co.uk/yaffs/>.
-
-config YAFFS_YAFFS1
- bool "512 byte / page devices"
- depends on YAFFS_FS
- default y
- help
- Enable yaffs1 support -- yaffs for 512 byte / page devices
-
- Not needed for 2K-page devices.
-
- If unsure, say Y.
-
-config YAFFS_9BYTE_TAGS
- bool "Use older-style on-NAND data format with pageStatus byte"
- depends on YAFFS_YAFFS1
- default n
- help
-
- Older-style on-NAND data format has a "pageStatus" byte to record
- chunk/page state. This byte is zero when the page is discarded.
- Choose this option if you have existing on-NAND data using this
- format that you need to continue to support. New data written
- also uses the older-style format. Note: Use of this option
- generally requires that MTD's oob layout be adjusted to use the
- older-style format. See notes on tags formats and MTD versions
- in yaffs_mtdif1.c.
-
- If unsure, say N.
-
-config YAFFS_DOES_ECC
- bool "Lets yaffs do its own ECC"
- depends on YAFFS_FS && YAFFS_YAFFS1 && !YAFFS_9BYTE_TAGS
- default n
- help
- This enables yaffs to use its own ECC functions instead of using
- the ones from the generic MTD-NAND driver.
-
- If unsure, say N.
-
-config YAFFS_ECC_WRONG_ORDER
- bool "Use the same ecc byte order as Steven Hill's nand_ecc.c"
- depends on YAFFS_FS && YAFFS_DOES_ECC && !YAFFS_9BYTE_TAGS
- default n
- help
- This makes yaffs_ecc.c use the same ecc byte order as Steven
- Hill's nand_ecc.c. If not set, then you get the same ecc byte
- order as SmartMedia.
-
- If unsure, say N.
-
-config YAFFS_YAFFS2
- bool "2048 byte (or larger) / page devices"
- depends on YAFFS_FS
- default y
- help
- Enable yaffs2 support -- yaffs for >= 2K bytes per page devices
-
- If unsure, say Y.
-
-config YAFFS_AUTO_YAFFS2
- bool "Autoselect yaffs2 format"
- depends on YAFFS_YAFFS2
- default y
- help
- Without this, you need to explicitely use yaffs2 as the file
- system type. With this, you can say "yaffs" and yaffs or yaffs2
- will be used depending on the device page size (yaffs on
- 512-byte page devices, yaffs2 on 2K page devices).
-
- If unsure, say Y.
-
-config YAFFS_DISABLE_TAGS_ECC
- bool "Disable yaffs from doing ECC on tags by default"
- depends on YAFFS_FS && YAFFS_YAFFS2
- default n
- help
- 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.
-
-config YAFFS_ALWAYS_CHECK_CHUNK_ERASED
- bool "Force chunk erase check"
- depends on YAFFS_FS
- default n
- help
- Normally yaffs only checks chunks before writing until an erased
- chunk is found. This helps to detect any partially written
- chunks that might have happened due to power loss.
-
- Enabling this forces on the test that chunks are erased in flash
- before writing to them. This takes more time but is potentially
- a bit more secure.
-
- Suggest setting Y during development and ironing out driver
- issues etc. Suggest setting to N if you want faster writing.
-
- 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_DISABLE_BAD_BLOCK_MARKING
- bool "Disable yaffs2 bad block marking"
- depends on YAFFS_FS
- default n
- help
- Useful during early flash bring up to prevent problems causing
- lots of bad block marking.
-
- 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.
+++ /dev/null
-#
-# Makefile for the linux YAFFS filesystem routines.
-#
-
-obj-$(CONFIG_YAFFS_FS) += yaffs.o
-
-yaffs-y := yaffs_ecc.o yaffs_vfs.o yaffs_guts.o yaffs_checkptrw.o
-yaffs-y += yaffs_packedtags1.o yaffs_packedtags2.o yaffs_nand.o
-yaffs-y += yaffs_tagscompat.o yaffs_tagsmarshall.o
-yaffs-y += yaffs_mtdif.o
-yaffs-y += yaffs_nameval.o yaffs_attribs.o
-yaffs-y += yaffs_allocator.o
-yaffs-y += yaffs_yaffs1.o
-yaffs-y += yaffs_yaffs2.o
-yaffs-y += yaffs_bitmap.o
-yaffs-y += yaffs_summary.o
-yaffs-y += yaffs_verify.o
-
+++ /dev/null
-The yaffs2 source has been fetched from the yaffs2 GIT tree.
-
-URL: git://www.aleph1.co.uk/yaffs2
-Version: 583dbd9cc2668870cb013f051ba59f7d3e513dae (2015-06-02)
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_allocator.h"
-#include "yaffs_guts.h"
-#include "yaffs_trace.h"
-#include "yportenv.h"
-
-/*
- * Each entry in yaffs_tnode_list and yaffs_obj_list hold blocks
- * of approx 100 objects that are themn allocated singly.
- * This is basically a simplified slab allocator.
- *
- * We don't use the Linux slab allocator because slab does not allow
- * us to dump all the objects in one hit when we do a umount and tear
- * down all the tnodes and objects. slab requires that we first free
- * the individual objects.
- *
- * Once yaffs has been mainlined I shall try to motivate for a change
- * to slab to provide the extra features we need here.
- */
-
-struct yaffs_tnode_list {
- struct yaffs_tnode_list *next;
- struct yaffs_tnode *tnodes;
-};
-
-struct yaffs_obj_list {
- struct yaffs_obj_list *next;
- struct yaffs_obj *objects;
-};
-
-struct yaffs_allocator {
- int n_tnodes_created;
- struct yaffs_tnode *free_tnodes;
- int n_free_tnodes;
- struct yaffs_tnode_list *alloc_tnode_list;
-
- int n_obj_created;
- struct list_head free_objs;
- int n_free_objects;
-
- struct yaffs_obj_list *allocated_obj_list;
-};
-
-static void yaffs_deinit_raw_tnodes(struct yaffs_dev *dev)
-{
- struct yaffs_allocator *allocator =
- (struct yaffs_allocator *)dev->allocator;
- struct yaffs_tnode_list *tmp;
-
- if (!allocator) {
- BUG();
- return;
- }
-
- while (allocator->alloc_tnode_list) {
- tmp = allocator->alloc_tnode_list->next;
-
- kfree(allocator->alloc_tnode_list->tnodes);
- kfree(allocator->alloc_tnode_list);
- allocator->alloc_tnode_list = tmp;
- }
-
- allocator->free_tnodes = NULL;
- allocator->n_free_tnodes = 0;
- allocator->n_tnodes_created = 0;
-}
-
-static void yaffs_init_raw_tnodes(struct yaffs_dev *dev)
-{
- struct yaffs_allocator *allocator = dev->allocator;
-
- if (!allocator) {
- BUG();
- return;
- }
-
- allocator->alloc_tnode_list = NULL;
- allocator->free_tnodes = NULL;
- allocator->n_free_tnodes = 0;
- allocator->n_tnodes_created = 0;
-}
-
-static int yaffs_create_tnodes(struct yaffs_dev *dev, int n_tnodes)
-{
- struct yaffs_allocator *allocator =
- (struct yaffs_allocator *)dev->allocator;
- int i;
- struct yaffs_tnode *new_tnodes;
- u8 *mem;
- struct yaffs_tnode *curr;
- struct yaffs_tnode *next;
- struct yaffs_tnode_list *tnl;
-
- if (!allocator) {
- BUG();
- return YAFFS_FAIL;
- }
-
- if (n_tnodes < 1)
- return YAFFS_OK;
-
- /* make these things */
- new_tnodes = kmalloc(n_tnodes * dev->tnode_size, GFP_NOFS);
- mem = (u8 *) new_tnodes;
-
- if (!new_tnodes) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs: Could not allocate Tnodes");
- return YAFFS_FAIL;
- }
-
- /* New hookup for wide tnodes */
- for (i = 0; i < n_tnodes - 1; i++) {
- curr = (struct yaffs_tnode *)&mem[i * dev->tnode_size];
- next = (struct yaffs_tnode *)&mem[(i + 1) * dev->tnode_size];
- curr->internal[0] = next;
- }
-
- curr = (struct yaffs_tnode *)&mem[(n_tnodes - 1) * dev->tnode_size];
- curr->internal[0] = allocator->free_tnodes;
- allocator->free_tnodes = (struct yaffs_tnode *)mem;
-
- allocator->n_free_tnodes += n_tnodes;
- allocator->n_tnodes_created += n_tnodes;
-
- /* 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 = kmalloc(sizeof(struct yaffs_tnode_list), GFP_NOFS);
- if (!tnl) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "Could not add tnodes to management list");
- return YAFFS_FAIL;
- } else {
- tnl->tnodes = new_tnodes;
- tnl->next = allocator->alloc_tnode_list;
- allocator->alloc_tnode_list = tnl;
- }
-
- yaffs_trace(YAFFS_TRACE_ALLOCATE, "Tnodes added");
-
- return YAFFS_OK;
-}
-
-struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev)
-{
- struct yaffs_allocator *allocator =
- (struct yaffs_allocator *)dev->allocator;
- struct yaffs_tnode *tn = NULL;
-
- if (!allocator) {
- BUG();
- return NULL;
- }
-
- /* If there are none left make more */
- if (!allocator->free_tnodes)
- yaffs_create_tnodes(dev, YAFFS_ALLOCATION_NTNODES);
-
- if (allocator->free_tnodes) {
- tn = allocator->free_tnodes;
- allocator->free_tnodes = allocator->free_tnodes->internal[0];
- allocator->n_free_tnodes--;
- }
-
- return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
-{
- struct yaffs_allocator *allocator = dev->allocator;
-
- if (!allocator) {
- BUG();
- return;
- }
-
- if (tn) {
- tn->internal[0] = allocator->free_tnodes;
- allocator->free_tnodes = tn;
- allocator->n_free_tnodes++;
- }
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-}
-
-/*--------------- yaffs_obj alloaction ------------------------
- *
- * Free yaffs_objs are stored in a list using obj->siblings.
- * The blocks of allocated objects are stored in a linked list.
- */
-
-static void yaffs_init_raw_objs(struct yaffs_dev *dev)
-{
- struct yaffs_allocator *allocator = dev->allocator;
-
- if (!allocator) {
- BUG();
- return;
- }
-
- allocator->allocated_obj_list = NULL;
- INIT_LIST_HEAD(&allocator->free_objs);
- allocator->n_free_objects = 0;
-}
-
-static void yaffs_deinit_raw_objs(struct yaffs_dev *dev)
-{
- struct yaffs_allocator *allocator = dev->allocator;
- struct yaffs_obj_list *tmp;
-
- if (!allocator) {
- BUG();
- return;
- }
-
- while (allocator->allocated_obj_list) {
- tmp = allocator->allocated_obj_list->next;
- kfree(allocator->allocated_obj_list->objects);
- kfree(allocator->allocated_obj_list);
- allocator->allocated_obj_list = tmp;
- }
-
- INIT_LIST_HEAD(&allocator->free_objs);
- allocator->n_free_objects = 0;
- allocator->n_obj_created = 0;
-}
-
-static int yaffs_create_free_objs(struct yaffs_dev *dev, int n_obj)
-{
- struct yaffs_allocator *allocator = dev->allocator;
- int i;
- struct yaffs_obj *new_objs;
- struct yaffs_obj_list *list;
-
- if (!allocator) {
- BUG();
- return YAFFS_FAIL;
- }
-
- if (n_obj < 1)
- return YAFFS_OK;
-
- /* make these things */
- new_objs = kmalloc(n_obj * sizeof(struct yaffs_obj), GFP_NOFS);
- list = kmalloc(sizeof(struct yaffs_obj_list), GFP_NOFS);
-
- if (!new_objs || !list) {
- kfree(new_objs);
- new_objs = NULL;
- kfree(list);
- list = NULL;
- yaffs_trace(YAFFS_TRACE_ALLOCATE,
- "Could not allocate more objects");
- return YAFFS_FAIL;
- }
-
- /* Hook them into the free list */
- for (i = 0; i < n_obj; i++)
- list_add(&new_objs[i].siblings, &allocator->free_objs);
-
- allocator->n_free_objects += n_obj;
- allocator->n_obj_created += n_obj;
-
- /* Now add this bunch of Objects to a list for freeing up. */
-
- list->objects = new_objs;
- list->next = allocator->allocated_obj_list;
- allocator->allocated_obj_list = list;
-
- return YAFFS_OK;
-}
-
-struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj = NULL;
- struct list_head *lh;
- struct yaffs_allocator *allocator = dev->allocator;
-
- if (!allocator) {
- BUG();
- return obj;
- }
-
- /* If there are none left make more */
- if (list_empty(&allocator->free_objs))
- yaffs_create_free_objs(dev, YAFFS_ALLOCATION_NOBJECTS);
-
- if (!list_empty(&allocator->free_objs)) {
- lh = allocator->free_objs.next;
- obj = list_entry(lh, struct yaffs_obj, siblings);
- list_del_init(lh);
- allocator->n_free_objects--;
- }
-
- return obj;
-}
-
-void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj)
-{
-
- struct yaffs_allocator *allocator = dev->allocator;
-
- if (!allocator) {
- BUG();
- return;
- }
-
- /* Link into the free list. */
- list_add(&obj->siblings, &allocator->free_objs);
- allocator->n_free_objects++;
-}
-
-void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev)
-{
-
- if (!dev->allocator) {
- BUG();
- return;
- }
-
- yaffs_deinit_raw_tnodes(dev);
- yaffs_deinit_raw_objs(dev);
- kfree(dev->allocator);
- dev->allocator = NULL;
-}
-
-void yaffs_init_raw_tnodes_and_objs(struct yaffs_dev *dev)
-{
- struct yaffs_allocator *allocator;
-
- if (dev->allocator) {
- BUG();
- return;
- }
-
- allocator = kmalloc(sizeof(struct yaffs_allocator), GFP_NOFS);
- if (allocator) {
- dev->allocator = allocator;
- yaffs_init_raw_tnodes(dev);
- yaffs_init_raw_objs(dev);
- }
-}
-
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_init_raw_tnodes_and_objs(struct yaffs_dev *dev);
-void yaffs_deinit_raw_tnodes_and_objs(struct yaffs_dev *dev);
-
-struct yaffs_tnode *yaffs_alloc_raw_tnode(struct yaffs_dev *dev);
-void yaffs_free_raw_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn);
-
-struct yaffs_obj *yaffs_alloc_raw_obj(struct yaffs_dev *dev);
-void yaffs_free_raw_obj(struct yaffs_dev *dev, struct yaffs_obj *obj);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_attribs.h"
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
-#define IATTR_UID ia_uid
-#define IATTR_GID ia_gid
-#else
-#define IATTR_UID ia_uid.val
-#define IATTR_GID ia_gid.val
-#endif
-
-void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh)
-{
- obj->yst_uid = oh->yst_uid;
- obj->yst_gid = oh->yst_gid;
- obj->yst_atime = oh->yst_atime;
- obj->yst_mtime = oh->yst_mtime;
- obj->yst_ctime = oh->yst_ctime;
- obj->yst_rdev = oh->yst_rdev;
-}
-
-void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj)
-{
- oh->yst_uid = obj->yst_uid;
- oh->yst_gid = obj->yst_gid;
- oh->yst_atime = obj->yst_atime;
- oh->yst_mtime = obj->yst_mtime;
- oh->yst_ctime = obj->yst_ctime;
- oh->yst_rdev = obj->yst_rdev;
-
-}
-
-void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c)
-{
- obj->yst_mtime = Y_CURRENT_TIME;
- if (do_a)
- obj->yst_atime = obj->yst_mtime;
- if (do_c)
- obj->yst_ctime = obj->yst_mtime;
-}
-
-void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev)
-{
- yaffs_load_current_time(obj, 1, 1);
- obj->yst_rdev = rdev;
- obj->yst_uid = uid;
- obj->yst_gid = gid;
-}
-
-static loff_t yaffs_get_file_size(struct yaffs_obj *obj)
-{
- YCHAR *alias = NULL;
- obj = yaffs_get_equivalent_obj(obj);
-
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- return obj->variant.file_variant.file_size;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- alias = obj->variant.symlink_variant.alias;
- if (!alias)
- return 0;
- return strnlen(alias, YAFFS_MAX_ALIAS_LENGTH);
- default:
- return 0;
- }
-}
-
-int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr)
-{
- unsigned int valid = attr->ia_valid;
-
- if (valid & ATTR_MODE)
- obj->yst_mode = attr->ia_mode;
- if (valid & ATTR_UID)
- obj->yst_uid = attr->IATTR_UID;
- if (valid & ATTR_GID)
- obj->yst_gid = attr->IATTR_GID;
-
- if (valid & ATTR_ATIME)
- obj->yst_atime = Y_TIME_CONVERT(attr->ia_atime);
- if (valid & ATTR_CTIME)
- obj->yst_ctime = Y_TIME_CONVERT(attr->ia_ctime);
- if (valid & ATTR_MTIME)
- obj->yst_mtime = Y_TIME_CONVERT(attr->ia_mtime);
-
- if (valid & ATTR_SIZE)
- yaffs_resize_file(obj, attr->ia_size);
-
- yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
-
- return YAFFS_OK;
-
-}
-
-int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr)
-{
- unsigned int valid = 0;
-
- attr->ia_mode = obj->yst_mode;
- valid |= ATTR_MODE;
- attr->IATTR_UID = obj->yst_uid;
- valid |= ATTR_UID;
- attr->IATTR_GID = obj->yst_gid;
- valid |= ATTR_GID;
-
- Y_TIME_CONVERT(attr->ia_atime) = obj->yst_atime;
- valid |= ATTR_ATIME;
- Y_TIME_CONVERT(attr->ia_ctime) = obj->yst_ctime;
- valid |= ATTR_CTIME;
- Y_TIME_CONVERT(attr->ia_mtime) = obj->yst_mtime;
- valid |= ATTR_MTIME;
-
- attr->ia_size = yaffs_get_file_size(obj);
- valid |= ATTR_SIZE;
-
- attr->ia_valid = valid;
-
- return YAFFS_OK;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_ATTRIBS_H__
-#define __YAFFS_ATTRIBS_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_load_attribs(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh);
-void yaffs_load_attribs_oh(struct yaffs_obj_hdr *oh, struct yaffs_obj *obj);
-void yaffs_attribs_init(struct yaffs_obj *obj, u32 gid, u32 uid, u32 rdev);
-void yaffs_load_current_time(struct yaffs_obj *obj, int do_a, int do_c);
-int yaffs_set_attribs(struct yaffs_obj *obj, struct iattr *attr);
-int yaffs_get_attribs(struct yaffs_obj *obj, struct iattr *attr);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 inline u8 *yaffs_block_bits(struct yaffs_dev *dev, int blk)
-{
- if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "BlockBits block %d is not valid",
- blk);
- BUG();
- }
- return dev->chunk_bits +
- (dev->chunk_bit_stride * (blk - dev->internal_start_block));
-}
-
-void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk)
-{
- if (blk < dev->internal_start_block || blk > dev->internal_end_block ||
- chunk < 0 || chunk >= dev->param.chunks_per_block) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "Chunk Id (%d:%d) invalid",
- blk, chunk);
- BUG();
- }
-}
-
-void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk)
-{
- u8 *blk_bits = yaffs_block_bits(dev, blk);
-
- memset(blk_bits, 0, dev->chunk_bit_stride);
-}
-
-void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
-{
- u8 *blk_bits = yaffs_block_bits(dev, blk);
-
- yaffs_verify_chunk_bit_id(dev, blk, chunk);
- blk_bits[chunk / 8] &= ~(1 << (chunk & 7));
-}
-
-void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
-{
- u8 *blk_bits = yaffs_block_bits(dev, blk);
-
- yaffs_verify_chunk_bit_id(dev, blk, chunk);
- blk_bits[chunk / 8] |= (1 << (chunk & 7));
-}
-
-int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk)
-{
- u8 *blk_bits = yaffs_block_bits(dev, blk);
-
- yaffs_verify_chunk_bit_id(dev, blk, chunk);
- return (blk_bits[chunk / 8] & (1 << (chunk & 7))) ? 1 : 0;
-}
-
-int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk)
-{
- u8 *blk_bits = yaffs_block_bits(dev, blk);
- int i;
-
- for (i = 0; i < dev->chunk_bit_stride; i++) {
- if (*blk_bits)
- return 1;
- blk_bits++;
- }
- return 0;
-}
-
-int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk)
-{
- u8 *blk_bits = yaffs_block_bits(dev, blk);
- int i;
- int n = 0;
-
- for (i = 0; i < dev->chunk_bit_stride; i++, blk_bits++)
- n += hweight8(*blk_bits);
-
- return n;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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.
- */
-
-/*
- * Chunk bitmap manipulations
- */
-
-#ifndef __YAFFS_BITMAP_H__
-#define __YAFFS_BITMAP_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_verify_chunk_bit_id(struct yaffs_dev *dev, int blk, int chunk);
-void yaffs_clear_chunk_bits(struct yaffs_dev *dev, int blk);
-void yaffs_clear_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
-void yaffs_set_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
-int yaffs_check_chunk_bit(struct yaffs_dev *dev, int blk, int chunk);
-int yaffs_still_some_chunks(struct yaffs_dev *dev, int blk);
-int yaffs_count_chunk_bits(struct yaffs_dev *dev, int blk);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_checkptrw.h"
-#include "yaffs_getblockinfo.h"
-
-struct yaffs_checkpt_chunk_hdr {
- int version;
- int seq;
- u32 sum;
- u32 xor;
-} ;
-
-
-static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
-{
- return chunk - dev->chunk_offset;
-}
-
-static int apply_block_offset(struct yaffs_dev *dev, int block)
-{
- return block - dev->block_offset;
-}
-
-static void yaffs2_checkpt_init_chunk_hdr(struct yaffs_dev *dev)
-{
- struct yaffs_checkpt_chunk_hdr hdr;
-
- hdr.version = YAFFS_CHECKPOINT_VERSION;
- hdr.seq = dev->checkpt_page_seq;
- hdr.sum = dev->checkpt_sum;
- hdr.xor = dev->checkpt_xor;
-
- dev->checkpt_byte_offs = sizeof(hdr);
-
- memcpy(dev->checkpt_buffer, &hdr, sizeof(hdr));
-}
-
-static int yaffs2_checkpt_check_chunk_hdr(struct yaffs_dev *dev)
-{
- struct yaffs_checkpt_chunk_hdr hdr;
-
- memcpy(&hdr, dev->checkpt_buffer, sizeof(hdr));
-
- dev->checkpt_byte_offs = sizeof(hdr);
-
- return hdr.version == YAFFS_CHECKPOINT_VERSION &&
- hdr.seq == dev->checkpt_page_seq &&
- hdr.sum == dev->checkpt_sum &&
- hdr.xor == dev->checkpt_xor;
-}
-
-static int yaffs2_checkpt_space_ok(struct yaffs_dev *dev)
-{
- int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "checkpt blocks_avail = %d", blocks_avail);
-
- return (blocks_avail <= 0) ? 0 : 1;
-}
-
-static int yaffs_checkpt_erase(struct yaffs_dev *dev)
-{
- int i;
-
- if (!dev->drv.drv_erase_fn)
- return 0;
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "checking blocks %d to %d",
- dev->internal_start_block, dev->internal_end_block);
-
- for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
- int offset_i = apply_block_offset(dev, i);
- int result;
-
- if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "erasing checkpt block %d", i);
-
- dev->n_erasures++;
-
- result = dev->drv.drv_erase_fn(dev, offset_i);
- if(result) {
- bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
- dev->n_erased_blocks++;
- dev->n_free_chunks +=
- dev->param.chunks_per_block;
- } else {
- dev->drv.drv_mark_bad_fn(dev, offset_i);
- bi->block_state = YAFFS_BLOCK_STATE_DEAD;
- }
- }
- }
-
- dev->blocks_in_checkpt = 0;
-
- return 1;
-}
-
-static void yaffs2_checkpt_find_erased_block(struct yaffs_dev *dev)
-{
- int i;
- int blocks_avail = dev->n_erased_blocks - dev->param.n_reserved_blocks;
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "allocating checkpt block: erased %d reserved %d avail %d next %d ",
- dev->n_erased_blocks, dev->param.n_reserved_blocks,
- blocks_avail, dev->checkpt_next_block);
-
- if (dev->checkpt_next_block >= 0 &&
- dev->checkpt_next_block <= dev->internal_end_block &&
- blocks_avail > 0) {
-
- for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
- i++) {
- struct yaffs_block_info *bi;
-
- bi = yaffs_get_block_info(dev, i);
- if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
- dev->checkpt_next_block = i + 1;
- dev->checkpt_cur_block = i;
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "allocating checkpt block %d", i);
- return;
- }
- }
- }
- yaffs_trace(YAFFS_TRACE_CHECKPOINT, "out of checkpt blocks");
-
- dev->checkpt_next_block = -1;
- dev->checkpt_cur_block = -1;
-}
-
-static void yaffs2_checkpt_find_block(struct yaffs_dev *dev)
-{
- int i;
- struct yaffs_ext_tags tags;
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "find next checkpt block: start: blocks %d next %d",
- dev->blocks_in_checkpt, dev->checkpt_next_block);
-
- if (dev->blocks_in_checkpt < dev->checkpt_max_blocks)
- for (i = dev->checkpt_next_block; i <= dev->internal_end_block;
- i++) {
- int chunk = i * dev->param.chunks_per_block;
- enum yaffs_block_state state;
- u32 seq;
-
- dev->tagger.read_chunk_tags_fn(dev,
- apply_chunk_offset(dev, chunk),
- NULL, &tags);
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "find next checkpt block: search: block %d state %d oid %d seq %d eccr %d",
- i, (int) state,
- tags.obj_id, tags.seq_number,
- tags.ecc_result);
-
- if (tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
- continue;
-
- dev->tagger.query_block_fn(dev,
- apply_block_offset(dev, i),
- &state, &seq);
- if (state == YAFFS_BLOCK_STATE_DEAD)
- continue;
-
- /* Right kind of block */
- dev->checkpt_next_block = tags.obj_id;
- dev->checkpt_cur_block = i;
- dev->checkpt_block_list[dev->blocks_in_checkpt] = i;
- dev->blocks_in_checkpt++;
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "found checkpt block %d", i);
- return;
- }
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT, "found no more checkpt blocks");
-
- dev->checkpt_next_block = -1;
- dev->checkpt_cur_block = -1;
-}
-
-int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing)
-{
- int i;
-
- dev->checkpt_open_write = writing;
-
- /* Got the functions we need? */
- if (!dev->tagger.write_chunk_tags_fn ||
- !dev->tagger.read_chunk_tags_fn ||
- !dev->drv.drv_erase_fn ||
- !dev->drv.drv_mark_bad_fn)
- return 0;
-
- if (writing && !yaffs2_checkpt_space_ok(dev))
- return 0;
-
- if (!dev->checkpt_buffer)
- dev->checkpt_buffer =
- kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
- if (!dev->checkpt_buffer)
- return 0;
-
- dev->checkpt_page_seq = 0;
- dev->checkpt_byte_count = 0;
- dev->checkpt_sum = 0;
- dev->checkpt_xor = 0;
- dev->checkpt_cur_block = -1;
- dev->checkpt_cur_chunk = -1;
- dev->checkpt_next_block = dev->internal_start_block;
-
- if (writing) {
- memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
- yaffs2_checkpt_init_chunk_hdr(dev);
- return yaffs_checkpt_erase(dev);
- }
-
- /* Opening for a read */
- /* Set to a value that will kick off a read */
- dev->checkpt_byte_offs = dev->data_bytes_per_chunk;
- /* A checkpoint block list of 1 checkpoint block per 16 block is
- * (hopefully) going to be way more than we need */
- dev->blocks_in_checkpt = 0;
- dev->checkpt_max_blocks =
- (dev->internal_end_block - dev->internal_start_block) / 16 + 2;
- if (!dev->checkpt_block_list)
- dev->checkpt_block_list =
- kmalloc(sizeof(int) * dev->checkpt_max_blocks, GFP_NOFS);
-
- if (!dev->checkpt_block_list)
- return 0;
-
- for (i = 0; i < dev->checkpt_max_blocks; i++)
- dev->checkpt_block_list[i] = -1;
-
- return 1;
-}
-
-int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum)
-{
- u32 composite_sum;
-
- composite_sum = (dev->checkpt_sum << 8) | (dev->checkpt_xor & 0xff);
- *sum = composite_sum;
- return 1;
-}
-
-static int yaffs2_checkpt_flush_buffer(struct yaffs_dev *dev)
-{
- int chunk;
- int offset_chunk;
- struct yaffs_ext_tags tags;
-
- if (dev->checkpt_cur_block < 0) {
- yaffs2_checkpt_find_erased_block(dev);
- dev->checkpt_cur_chunk = 0;
- }
-
- if (dev->checkpt_cur_block < 0)
- return 0;
-
- tags.is_deleted = 0;
- tags.obj_id = dev->checkpt_next_block; /* Hint to next place to look */
- tags.chunk_id = dev->checkpt_page_seq + 1;
- tags.seq_number = YAFFS_SEQUENCE_CHECKPOINT_DATA;
- tags.n_bytes = dev->data_bytes_per_chunk;
- if (dev->checkpt_cur_chunk == 0) {
- /* First chunk we write for the block? Set block state to
- checkpoint */
- struct yaffs_block_info *bi =
- yaffs_get_block_info(dev, dev->checkpt_cur_block);
- bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
- dev->blocks_in_checkpt++;
- }
-
- chunk =
- dev->checkpt_cur_block * dev->param.chunks_per_block +
- dev->checkpt_cur_chunk;
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "checkpoint wite buffer nand %d(%d:%d) objid %d chId %d",
- chunk, dev->checkpt_cur_block, dev->checkpt_cur_chunk,
- tags.obj_id, tags.chunk_id);
-
- offset_chunk = apply_chunk_offset(dev, chunk);
-
- dev->n_page_writes++;
-
- dev->tagger.write_chunk_tags_fn(dev, offset_chunk,
- dev->checkpt_buffer, &tags);
- dev->checkpt_page_seq++;
- dev->checkpt_cur_chunk++;
- if (dev->checkpt_cur_chunk >= dev->param.chunks_per_block) {
- dev->checkpt_cur_chunk = 0;
- dev->checkpt_cur_block = -1;
- }
- memset(dev->checkpt_buffer, 0, dev->data_bytes_per_chunk);
-
- yaffs2_checkpt_init_chunk_hdr(dev);
-
-
- return 1;
-}
-
-int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes)
-{
- int i = 0;
- int ok = 1;
- u8 *data_bytes = (u8 *) data;
-
- if (!dev->checkpt_buffer)
- return 0;
-
- if (!dev->checkpt_open_write)
- return -1;
-
- while (i < n_bytes && ok) {
- dev->checkpt_buffer[dev->checkpt_byte_offs] = *data_bytes;
- dev->checkpt_sum += *data_bytes;
- dev->checkpt_xor ^= *data_bytes;
-
- dev->checkpt_byte_offs++;
- i++;
- data_bytes++;
- dev->checkpt_byte_count++;
-
- if (dev->checkpt_byte_offs < 0 ||
- dev->checkpt_byte_offs >= dev->data_bytes_per_chunk)
- ok = yaffs2_checkpt_flush_buffer(dev);
- }
-
- return i;
-}
-
-int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes)
-{
- int i = 0;
- struct yaffs_ext_tags tags;
- int chunk;
- int offset_chunk;
- u8 *data_bytes = (u8 *) data;
-
- if (!dev->checkpt_buffer)
- return 0;
-
- if (dev->checkpt_open_write)
- return -1;
-
- while (i < n_bytes) {
-
- if (dev->checkpt_byte_offs < 0 ||
- dev->checkpt_byte_offs >= dev->data_bytes_per_chunk) {
-
- if (dev->checkpt_cur_block < 0) {
- yaffs2_checkpt_find_block(dev);
- dev->checkpt_cur_chunk = 0;
- }
-
- /* Bail out if we can't find a checpoint block */
- if (dev->checkpt_cur_block < 0)
- break;
-
- chunk = dev->checkpt_cur_block *
- dev->param.chunks_per_block +
- dev->checkpt_cur_chunk;
-
- offset_chunk = apply_chunk_offset(dev, chunk);
- dev->n_page_reads++;
-
- /* Read in the next chunk */
- dev->tagger.read_chunk_tags_fn(dev,
- offset_chunk,
- dev->checkpt_buffer,
- &tags);
-
- /* Bail out if the chunk is corrupted. */
- if (tags.chunk_id != (dev->checkpt_page_seq + 1) ||
- tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
- tags.seq_number != YAFFS_SEQUENCE_CHECKPOINT_DATA)
- break;
-
- /* Bail out if it is not a checkpoint chunk. */
- if(!yaffs2_checkpt_check_chunk_hdr(dev))
- break;
-
- dev->checkpt_page_seq++;
- dev->checkpt_cur_chunk++;
-
- if (dev->checkpt_cur_chunk >=
- dev->param.chunks_per_block)
- dev->checkpt_cur_block = -1;
-
- }
-
- *data_bytes = dev->checkpt_buffer[dev->checkpt_byte_offs];
- dev->checkpt_sum += *data_bytes;
- dev->checkpt_xor ^= *data_bytes;
- dev->checkpt_byte_offs++;
- i++;
- data_bytes++;
- dev->checkpt_byte_count++;
- }
-
- return i; /* Number of bytes read */
-}
-
-int yaffs_checkpt_close(struct yaffs_dev *dev)
-{
- int i;
-
- if (dev->checkpt_open_write) {
- if (dev->checkpt_byte_offs !=
- sizeof(sizeof(struct yaffs_checkpt_chunk_hdr)))
- yaffs2_checkpt_flush_buffer(dev);
- } else if (dev->checkpt_block_list) {
- for (i = 0;
- i < dev->blocks_in_checkpt &&
- dev->checkpt_block_list[i] >= 0; i++) {
- int blk = dev->checkpt_block_list[i];
- struct yaffs_block_info *bi = NULL;
-
- if (dev->internal_start_block <= blk &&
- blk <= dev->internal_end_block)
- bi = yaffs_get_block_info(dev, blk);
- if (bi && bi->block_state == YAFFS_BLOCK_STATE_EMPTY)
- bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
- }
- }
-
- dev->n_free_chunks -=
- dev->blocks_in_checkpt * dev->param.chunks_per_block;
- dev->n_erased_blocks -= dev->blocks_in_checkpt;
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT, "checkpoint byte count %d",
- dev->checkpt_byte_count);
-
- if (dev->checkpt_buffer)
- return 1;
- else
- return 0;
-}
-
-int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev)
-{
- /* Erase the checkpoint data */
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "checkpoint invalidate of %d blocks",
- dev->blocks_in_checkpt);
-
- return yaffs_checkpt_erase(dev);
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_CHECKPTRW_H__
-#define __YAFFS_CHECKPTRW_H__
-
-#include "yaffs_guts.h"
-
-int yaffs2_checkpt_open(struct yaffs_dev *dev, int writing);
-
-int yaffs2_checkpt_wr(struct yaffs_dev *dev, const void *data, int n_bytes);
-
-int yaffs2_checkpt_rd(struct yaffs_dev *dev, void *data, int n_bytes);
-
-int yaffs2_get_checkpt_sum(struct yaffs_dev *dev, u32 * sum);
-
-int yaffs_checkpt_close(struct yaffs_dev *dev);
-
-int yaffs2_checkpt_invalidate_stream(struct yaffs_dev *dev);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 code implements the ECC algorithm used in SmartMedia.
- *
- * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
- * The two unused bit are set to 1.
- * The ECC can correct single bit errors in a 256-byte page of data. Thus, two
- * such ECC blocks are used on a 512-byte NAND page.
- *
- */
-
-#include "yportenv.h"
-
-#include "yaffs_ecc.h"
-
-/* Table generated by gen-ecc.c
- * Using a table means we do not have to calculate p1..p4 and p1'..p4'
- * for each byte of data. These are instead provided in a table in bits7..2.
- * Bit 0 of each entry indicates whether the entry has an odd or even parity,
- * and therefore this bytes influence on the line parity.
- */
-
-static const unsigned char column_parity_table[] = {
- 0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
- 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
- 0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
- 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
- 0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
- 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
- 0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
- 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
- 0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
- 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
- 0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
- 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
- 0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
- 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
- 0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
- 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
- 0xa9, 0xfc, 0xf0, 0xa5, 0xcc, 0x99, 0x95, 0xc0,
- 0xc0, 0x95, 0x99, 0xcc, 0xa5, 0xf0, 0xfc, 0xa9,
- 0x3c, 0x69, 0x65, 0x30, 0x59, 0x0c, 0x00, 0x55,
- 0x55, 0x00, 0x0c, 0x59, 0x30, 0x65, 0x69, 0x3c,
- 0x30, 0x65, 0x69, 0x3c, 0x55, 0x00, 0x0c, 0x59,
- 0x59, 0x0c, 0x00, 0x55, 0x3c, 0x69, 0x65, 0x30,
- 0xa5, 0xf0, 0xfc, 0xa9, 0xc0, 0x95, 0x99, 0xcc,
- 0xcc, 0x99, 0x95, 0xc0, 0xa9, 0xfc, 0xf0, 0xa5,
- 0x0c, 0x59, 0x55, 0x00, 0x69, 0x3c, 0x30, 0x65,
- 0x65, 0x30, 0x3c, 0x69, 0x00, 0x55, 0x59, 0x0c,
- 0x99, 0xcc, 0xc0, 0x95, 0xfc, 0xa9, 0xa5, 0xf0,
- 0xf0, 0xa5, 0xa9, 0xfc, 0x95, 0xc0, 0xcc, 0x99,
- 0x95, 0xc0, 0xcc, 0x99, 0xf0, 0xa5, 0xa9, 0xfc,
- 0xfc, 0xa9, 0xa5, 0xf0, 0x99, 0xcc, 0xc0, 0x95,
- 0x00, 0x55, 0x59, 0x0c, 0x65, 0x30, 0x3c, 0x69,
- 0x69, 0x3c, 0x30, 0x65, 0x0c, 0x59, 0x55, 0x00,
-};
-
-
-/* Calculate the ECC for a 256-byte block of data */
-void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc)
-{
- unsigned int i;
- unsigned char col_parity = 0;
- unsigned char line_parity = 0;
- unsigned char line_parity_prime = 0;
- unsigned char t;
- unsigned char b;
-
- for (i = 0; i < 256; i++) {
- b = column_parity_table[*data++];
- col_parity ^= b;
-
- if (b & 0x01) { /* odd number of bits in the byte */
- line_parity ^= i;
- line_parity_prime ^= ~i;
- }
- }
-
- ecc[2] = (~col_parity) | 0x03;
-
- t = 0;
- if (line_parity & 0x80)
- t |= 0x80;
- if (line_parity_prime & 0x80)
- t |= 0x40;
- if (line_parity & 0x40)
- t |= 0x20;
- if (line_parity_prime & 0x40)
- t |= 0x10;
- if (line_parity & 0x20)
- t |= 0x08;
- if (line_parity_prime & 0x20)
- t |= 0x04;
- if (line_parity & 0x10)
- t |= 0x02;
- if (line_parity_prime & 0x10)
- t |= 0x01;
- ecc[1] = ~t;
-
- t = 0;
- if (line_parity & 0x08)
- t |= 0x80;
- if (line_parity_prime & 0x08)
- t |= 0x40;
- if (line_parity & 0x04)
- t |= 0x20;
- if (line_parity_prime & 0x04)
- t |= 0x10;
- if (line_parity & 0x02)
- t |= 0x08;
- if (line_parity_prime & 0x02)
- t |= 0x04;
- if (line_parity & 0x01)
- t |= 0x02;
- if (line_parity_prime & 0x01)
- t |= 0x01;
- ecc[0] = ~t;
-
-}
-
-/* Correct the ECC on a 256 byte block of data */
-
-int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
- const unsigned char *test_ecc)
-{
- unsigned char d0, d1, d2; /* deltas */
-
- d0 = read_ecc[0] ^ test_ecc[0];
- d1 = read_ecc[1] ^ test_ecc[1];
- d2 = read_ecc[2] ^ test_ecc[2];
-
- if ((d0 | d1 | d2) == 0)
- return 0; /* no error */
-
- if (((d0 ^ (d0 >> 1)) & 0x55) == 0x55 &&
- ((d1 ^ (d1 >> 1)) & 0x55) == 0x55 &&
- ((d2 ^ (d2 >> 1)) & 0x54) == 0x54) {
- /* Single bit (recoverable) error in data */
-
- unsigned byte;
- unsigned bit;
-
- bit = byte = 0;
-
- if (d1 & 0x80)
- byte |= 0x80;
- if (d1 & 0x20)
- byte |= 0x40;
- if (d1 & 0x08)
- byte |= 0x20;
- if (d1 & 0x02)
- byte |= 0x10;
- if (d0 & 0x80)
- byte |= 0x08;
- if (d0 & 0x20)
- byte |= 0x04;
- if (d0 & 0x08)
- byte |= 0x02;
- if (d0 & 0x02)
- byte |= 0x01;
-
- if (d2 & 0x80)
- bit |= 0x04;
- if (d2 & 0x20)
- bit |= 0x02;
- if (d2 & 0x08)
- bit |= 0x01;
-
- data[byte] ^= (1 << bit);
-
- return 1; /* Corrected the error */
- }
-
- if ((hweight8(d0) + hweight8(d1) + hweight8(d2)) == 1) {
- /* Reccoverable error in ecc */
-
- read_ecc[0] = test_ecc[0];
- read_ecc[1] = test_ecc[1];
- read_ecc[2] = test_ecc[2];
-
- return 1; /* Corrected the error */
- }
-
- /* Unrecoverable error */
-
- return -1;
-
-}
-
-/*
- * ECCxxxOther does ECC calcs on arbitrary n bytes of data
- */
-void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
- struct yaffs_ecc_other *ecc_other)
-{
- unsigned int i;
- unsigned char col_parity = 0;
- unsigned line_parity = 0;
- unsigned line_parity_prime = 0;
- unsigned char b;
-
- for (i = 0; i < n_bytes; i++) {
- b = column_parity_table[*data++];
- col_parity ^= b;
-
- if (b & 0x01) {
- /* odd number of bits in the byte */
- line_parity ^= i;
- line_parity_prime ^= ~i;
- }
-
- }
-
- ecc_other->col_parity = (col_parity >> 2) & 0x3f;
- ecc_other->line_parity = line_parity;
- ecc_other->line_parity_prime = line_parity_prime;
-}
-
-int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
- struct yaffs_ecc_other *read_ecc,
- const struct yaffs_ecc_other *test_ecc)
-{
- unsigned char delta_col; /* column parity delta */
- unsigned delta_line; /* line parity delta */
- unsigned delta_line_prime; /* line parity delta */
- unsigned bit;
-
- delta_col = read_ecc->col_parity ^ test_ecc->col_parity;
- delta_line = read_ecc->line_parity ^ test_ecc->line_parity;
- delta_line_prime =
- read_ecc->line_parity_prime ^ test_ecc->line_parity_prime;
-
- if ((delta_col | delta_line | delta_line_prime) == 0)
- return 0; /* no error */
-
- if (delta_line == ~delta_line_prime &&
- (((delta_col ^ (delta_col >> 1)) & 0x15) == 0x15)) {
- /* Single bit (recoverable) error in data */
-
- bit = 0;
-
- if (delta_col & 0x20)
- bit |= 0x04;
- if (delta_col & 0x08)
- bit |= 0x02;
- if (delta_col & 0x02)
- bit |= 0x01;
-
- if (delta_line >= n_bytes)
- return -1;
-
- data[delta_line] ^= (1 << bit);
-
- return 1; /* corrected */
- }
-
- if ((hweight32(delta_line) +
- hweight32(delta_line_prime) +
- hweight8(delta_col)) == 1) {
- /* Reccoverable error in ecc */
-
- *read_ecc = *test_ecc;
- return 1; /* corrected */
- }
-
- /* Unrecoverable error */
-
- return -1;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 code implements the ECC algorithm used in SmartMedia.
- *
- * The ECC comprises 22 bits of parity information and is stuffed into 3 bytes.
- * The two unused bit are set to 1.
- * The ECC can correct single bit errors in a 256-byte page of data.
- * Thus, two such ECC blocks are used on a 512-byte NAND page.
- *
- */
-
-#ifndef __YAFFS_ECC_H__
-#define __YAFFS_ECC_H__
-
-struct yaffs_ecc_other {
- unsigned char col_parity;
- unsigned line_parity;
- unsigned line_parity_prime;
-};
-
-void yaffs_ecc_calc(const unsigned char *data, unsigned char *ecc);
-int yaffs_ecc_correct(unsigned char *data, unsigned char *read_ecc,
- const unsigned char *test_ecc);
-
-void yaffs_ecc_calc_other(const unsigned char *data, unsigned n_bytes,
- struct yaffs_ecc_other *ecc);
-int yaffs_ecc_correct_other(unsigned char *data, unsigned n_bytes,
- struct yaffs_ecc_other *read_ecc,
- const struct yaffs_ecc_other *test_ecc);
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_GETBLOCKINFO_H__
-#define __YAFFS_GETBLOCKINFO_H__
-
-#include "yaffs_guts.h"
-#include "yaffs_trace.h"
-
-/* Function to manipulate block info */
-static inline struct yaffs_block_info *yaffs_get_block_info(struct yaffs_dev
- *dev, int blk)
-{
- if (blk < dev->internal_start_block || blk > dev->internal_end_block) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>> yaffs: get_block_info block %d is not valid",
- blk);
- BUG();
- }
- return &dev->block_info[blk - dev->internal_start_block];
-}
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 "yportenv.h"
-#include "yaffs_trace.h"
-
-#include "yaffs_guts.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_tagscompat.h"
-#include "yaffs_tagsmarshall.h"
-#include "yaffs_nand.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"
-#include "yaffs_attribs.h"
-#include "yaffs_summary.h"
-
-/* 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"
-
-/* Forward declarations */
-
-static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
- const u8 *buffer, int n_bytes, int use_reserve);
-
-static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
- int buffer_size);
-
-/* Function to calculate chunk and offset */
-
-void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
- int *chunk_out, u32 *offset_out)
-{
- int chunk;
- u32 offset;
-
- chunk = (u32) (addr >> dev->chunk_shift);
-
- if (dev->chunk_div == 1) {
- /* easy power of 2 case */
- offset = (u32) (addr & dev->chunk_mask);
- } else {
- /* Non power-of-2 case */
-
- loff_t chunk_base;
-
- chunk /= dev->chunk_div;
-
- chunk_base = ((loff_t) chunk) * dev->data_bytes_per_chunk;
- offset = (u32) (addr - chunk_base);
- }
-
- *chunk_out = chunk;
- *offset_out = offset;
-}
-
-/* Function to return the number of shifts for a power of 2 greater than or
- * equal to the given number
- * Note we don't try to cater for all possible numbers and this does not have to
- * be hellishly efficient.
- */
-
-static inline u32 calc_shifts_ceiling(u32 x)
-{
- int extra_bits;
- int shifts;
-
- shifts = extra_bits = 0;
-
- while (x > 1) {
- if (x & 1)
- extra_bits++;
- x >>= 1;
- shifts++;
- }
-
- if (extra_bits)
- shifts++;
-
- return shifts;
-}
-
-/* Function to return the number of shifts to get a 1 in bit 0
- */
-
-static inline u32 calc_shifts(u32 x)
-{
- u32 shifts;
-
- shifts = 0;
-
- if (!x)
- return 0;
-
- while (!(x & 1)) {
- x >>= 1;
- shifts++;
- }
-
- return shifts;
-}
-
-/*
- * Temporary buffer manipulations.
- */
-
-static int yaffs_init_tmp_buffers(struct yaffs_dev *dev)
-{
- int i;
- u8 *buf = (u8 *) 1;
-
- memset(dev->temp_buffer, 0, sizeof(dev->temp_buffer));
-
- for (i = 0; buf && i < YAFFS_N_TEMP_BUFFERS; i++) {
- dev->temp_buffer[i].in_use = 0;
- buf = kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
- dev->temp_buffer[i].buffer = buf;
- }
-
- return buf ? YAFFS_OK : YAFFS_FAIL;
-}
-
-u8 *yaffs_get_temp_buffer(struct yaffs_dev * dev)
-{
- int i;
-
- dev->temp_in_use++;
- if (dev->temp_in_use > dev->max_temp)
- dev->max_temp = dev->temp_in_use;
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->temp_buffer[i].in_use == 0) {
- dev->temp_buffer[i].in_use = 1;
- return dev->temp_buffer[i].buffer;
- }
- }
-
- yaffs_trace(YAFFS_TRACE_BUFFERS, "Out of temp buffers");
- /*
- * If we got here then we have to allocate an unmanaged one
- * This is not good.
- */
-
- dev->unmanaged_buffer_allocs++;
- return kmalloc(dev->data_bytes_per_chunk, GFP_NOFS);
-
-}
-
-void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer)
-{
- int i;
-
- dev->temp_in_use--;
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- if (dev->temp_buffer[i].buffer == buffer) {
- dev->temp_buffer[i].in_use = 0;
- return;
- }
- }
-
- if (buffer) {
- /* assume it is an unmanaged one. */
- yaffs_trace(YAFFS_TRACE_BUFFERS,
- "Releasing unmanaged temp buffer");
- kfree(buffer);
- dev->unmanaged_buffer_deallocs++;
- }
-
-}
-
-/*
- * Functions for robustisizing TODO
- *
- */
-
-static void yaffs_handle_chunk_wr_ok(struct yaffs_dev *dev, int nand_chunk,
- const u8 *data,
- const struct yaffs_ext_tags *tags)
-{
- (void) dev;
- (void) nand_chunk;
- (void) data;
- (void) tags;
-}
-
-static void yaffs_handle_chunk_update(struct yaffs_dev *dev, int nand_chunk,
- const struct yaffs_ext_tags *tags)
-{
- (void) dev;
- (void) nand_chunk;
- (void) tags;
-}
-
-void yaffs_handle_chunk_error(struct yaffs_dev *dev,
- struct yaffs_block_info *bi)
-{
- if (!bi->gc_prioritise) {
- bi->gc_prioritise = 1;
- dev->has_pending_prioritised_gc = 1;
- bi->chunk_error_strikes++;
-
- if (bi->chunk_error_strikes > 3) {
- bi->needs_retiring = 1; /* Too many stikes, so retire */
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Block struck out");
-
- }
- }
-}
-
-static void yaffs_handle_chunk_wr_error(struct yaffs_dev *dev, int nand_chunk,
- int erased_ok)
-{
- int flash_block = nand_chunk / dev->param.chunks_per_block;
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-
- yaffs_handle_chunk_error(dev, bi);
-
- if (erased_ok) {
- /* Was an actual write failure,
- * so mark the block for retirement.*/
- bi->needs_retiring = 1;
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>> Block %d needs retiring", flash_block);
- }
-
- /* Delete the chunk */
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- yaffs_skip_rest_of_block(dev);
-}
-
-/*
- * Verification code
- */
-
-/*
- * Simple hash function. Needs to have a reasonable spread
- */
-
-static inline int yaffs_hash_fn(int n)
-{
- if (n < 0)
- n = -n;
- return n % YAFFS_NOBJECT_BUCKETS;
-}
-
-/*
- * Access functions to useful fake objects.
- * Note that root might have a presence in NAND if permissions are set.
- */
-
-struct yaffs_obj *yaffs_root(struct yaffs_dev *dev)
-{
- return dev->root_dir;
-}
-
-struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev)
-{
- return dev->lost_n_found;
-}
-
-/*
- * Erased NAND checking functions
- */
-
-int yaffs_check_ff(u8 *buffer, int n_bytes)
-{
- /* Horrible, slow implementation */
- while (n_bytes--) {
- if (*buffer != 0xff)
- return 0;
- buffer++;
- }
- return 1;
-}
-
-static int yaffs_check_chunk_erased(struct yaffs_dev *dev, int nand_chunk)
-{
- int retval = YAFFS_OK;
- u8 *data = yaffs_get_temp_buffer(dev);
- struct yaffs_ext_tags tags;
- int result;
-
- result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, data, &tags);
-
- if (tags.ecc_result > YAFFS_ECC_RESULT_NO_ERROR)
- retval = YAFFS_FAIL;
-
- if (!yaffs_check_ff(data, dev->data_bytes_per_chunk) ||
- tags.chunk_used) {
- yaffs_trace(YAFFS_TRACE_NANDACCESS,
- "Chunk %d not erased", nand_chunk);
- retval = YAFFS_FAIL;
- }
-
- yaffs_release_temp_buffer(dev, data);
-
- return retval;
-
-}
-
-static int yaffs_verify_chunk_written(struct yaffs_dev *dev,
- int nand_chunk,
- const u8 *data,
- struct yaffs_ext_tags *tags)
-{
- int retval = YAFFS_OK;
- struct yaffs_ext_tags temp_tags;
- u8 *buffer = yaffs_get_temp_buffer(dev);
- int result;
-
- result = yaffs_rd_chunk_tags_nand(dev, nand_chunk, buffer, &temp_tags);
- if (memcmp(buffer, data, dev->data_bytes_per_chunk) ||
- temp_tags.obj_id != tags->obj_id ||
- temp_tags.chunk_id != tags->chunk_id ||
- temp_tags.n_bytes != tags->n_bytes)
- retval = YAFFS_FAIL;
-
- yaffs_release_temp_buffer(dev, buffer);
-
- return retval;
-}
-
-
-int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks)
-{
- int reserved_chunks;
- int reserved_blocks = dev->param.n_reserved_blocks;
- int checkpt_blocks;
-
- checkpt_blocks = yaffs_calc_checkpt_blocks_required(dev);
-
- reserved_chunks =
- (reserved_blocks + checkpt_blocks) * dev->param.chunks_per_block;
-
- return (dev->n_free_chunks > (reserved_chunks + n_chunks));
-}
-
-static int yaffs_find_alloc_block(struct yaffs_dev *dev)
-{
- int i;
- struct yaffs_block_info *bi;
-
- if (dev->n_erased_blocks < 1) {
- /* Hoosterman we've got a problem.
- * Can't get space to gc
- */
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: no more erased blocks");
-
- return -1;
- }
-
- /* Find an empty block. */
-
- for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- dev->alloc_block_finder++;
- if (dev->alloc_block_finder < dev->internal_start_block
- || dev->alloc_block_finder > dev->internal_end_block) {
- dev->alloc_block_finder = dev->internal_start_block;
- }
-
- bi = yaffs_get_block_info(dev, dev->alloc_block_finder);
-
- if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
- bi->block_state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->seq_number++;
- bi->seq_number = dev->seq_number;
- dev->n_erased_blocks--;
- yaffs_trace(YAFFS_TRACE_ALLOCATE,
- "Allocated block %d, seq %d, %d left" ,
- dev->alloc_block_finder, dev->seq_number,
- dev->n_erased_blocks);
- return dev->alloc_block_finder;
- }
- }
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs tragedy: no more erased blocks, but there should have been %d",
- dev->n_erased_blocks);
-
- return -1;
-}
-
-static int yaffs_alloc_chunk(struct yaffs_dev *dev, int use_reserver,
- struct yaffs_block_info **block_ptr)
-{
- int ret_val;
- struct yaffs_block_info *bi;
-
- if (dev->alloc_block < 0) {
- /* Get next block to allocate off */
- dev->alloc_block = yaffs_find_alloc_block(dev);
- dev->alloc_page = 0;
- }
-
- if (!use_reserver && !yaffs_check_alloc_available(dev, 1)) {
- /* No space unless we're allowed to use the reserve. */
- return -1;
- }
-
- if (dev->n_erased_blocks < dev->param.n_reserved_blocks
- && dev->alloc_page == 0)
- yaffs_trace(YAFFS_TRACE_ALLOCATE, "Allocating reserve");
-
- /* Next page please.... */
- if (dev->alloc_block >= 0) {
- bi = yaffs_get_block_info(dev, dev->alloc_block);
-
- ret_val = (dev->alloc_block * dev->param.chunks_per_block) +
- dev->alloc_page;
- bi->pages_in_use++;
- yaffs_set_chunk_bit(dev, dev->alloc_block, dev->alloc_page);
-
- dev->alloc_page++;
-
- dev->n_free_chunks--;
-
- /* If the block is full set the state to full */
- if (dev->alloc_page >= dev->param.chunks_per_block) {
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- dev->alloc_block = -1;
- }
-
- if (block_ptr)
- *block_ptr = bi;
-
- return ret_val;
- }
-
- yaffs_trace(YAFFS_TRACE_ERROR,
- "!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!");
-
- return -1;
-}
-
-static int yaffs_get_erased_chunks(struct yaffs_dev *dev)
-{
- int n;
-
- n = dev->n_erased_blocks * dev->param.chunks_per_block;
-
- if (dev->alloc_block > 0)
- n += (dev->param.chunks_per_block - dev->alloc_page);
-
- return n;
-
-}
-
-/*
- * yaffs_skip_rest_of_block() skips over the rest of the allocation block
- * if we don't want to write to it.
- */
-void yaffs_skip_rest_of_block(struct yaffs_dev *dev)
-{
- struct yaffs_block_info *bi;
-
- if (dev->alloc_block > 0) {
- bi = yaffs_get_block_info(dev, dev->alloc_block);
- if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- dev->alloc_block = -1;
- }
- }
-}
-
-static int yaffs_write_new_chunk(struct yaffs_dev *dev,
- const u8 *data,
- struct yaffs_ext_tags *tags, int use_reserver)
-{
- int attempts = 0;
- int write_ok = 0;
- int chunk;
-
- yaffs2_checkpt_invalidate(dev);
-
- do {
- struct yaffs_block_info *bi = 0;
- int erased_ok = 0;
-
- chunk = yaffs_alloc_chunk(dev, use_reserver, &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.
- *
- * Mods to the above
- * If an erase check fails or the write fails we skip the
- * rest of the block.
- */
-
- /* let's give it a try */
- attempts++;
-
- if (dev->param.always_check_erased)
- bi->skip_erased_check = 0;
-
- if (!bi->skip_erased_check) {
- erased_ok = yaffs_check_chunk_erased(dev, chunk);
- if (erased_ok != YAFFS_OK) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>> yaffs chunk %d was not erased",
- chunk);
-
- /* If not erased, delete this one,
- * skip rest of block and
- * try another chunk */
- yaffs_chunk_del(dev, chunk, 1, __LINE__);
- yaffs_skip_rest_of_block(dev);
- continue;
- }
- }
-
- write_ok = yaffs_wr_chunk_tags_nand(dev, chunk, data, tags);
-
- if (!bi->skip_erased_check)
- write_ok =
- yaffs_verify_chunk_written(dev, chunk, data, tags);
-
- if (write_ok != YAFFS_OK) {
- /* Clean up aborted write, skip to next block and
- * try another chunk */
- yaffs_handle_chunk_wr_error(dev, chunk, erased_ok);
- continue;
- }
-
- bi->skip_erased_check = 1;
-
- /* Copy the data into the robustification buffer */
- yaffs_handle_chunk_wr_ok(dev, chunk, data, tags);
-
- } while (write_ok != YAFFS_OK &&
- (yaffs_wr_attempts <= 0 || attempts <= yaffs_wr_attempts));
-
- if (!write_ok)
- chunk = -1;
-
- if (attempts > 1) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>> yaffs write required %d attempts",
- attempts);
- dev->n_retried_writes += (attempts - 1);
- }
-
- return chunk;
-}
-
-/*
- * Block retiring for handling a broken block.
- */
-
-static void yaffs_retire_block(struct yaffs_dev *dev, int flash_block)
-{
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, flash_block);
-
- yaffs2_checkpt_invalidate(dev);
-
- yaffs2_clear_oldest_dirty_seq(dev, bi);
-
- if (yaffs_mark_bad(dev, flash_block) != YAFFS_OK) {
- if (yaffs_erase_block(dev, flash_block) != YAFFS_OK) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Failed to mark bad and erase block %d",
- flash_block);
- } else {
- struct yaffs_ext_tags tags;
- int chunk_id =
- flash_block * dev->param.chunks_per_block;
-
- u8 *buffer = yaffs_get_temp_buffer(dev);
-
- memset(buffer, 0xff, dev->data_bytes_per_chunk);
- memset(&tags, 0, sizeof(tags));
- tags.seq_number = YAFFS_SEQUENCE_BAD_BLOCK;
- if (dev->tagger.write_chunk_tags_fn(dev, chunk_id -
- dev->chunk_offset,
- buffer,
- &tags) != YAFFS_OK)
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Failed to write bad block marker to block %d",
- flash_block);
-
- yaffs_release_temp_buffer(dev, buffer);
- }
- }
-
- bi->block_state = YAFFS_BLOCK_STATE_DEAD;
- bi->gc_prioritise = 0;
- bi->needs_retiring = 0;
-
- dev->n_retired_blocks++;
-}
-
-/*---------------- Name handling functions ------------*/
-
-static void yaffs_load_name_from_oh(struct yaffs_dev *dev, YCHAR *name,
- const YCHAR *oh_name, int buff_size)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
- if (dev->param.auto_unicode) {
- if (*oh_name) {
- /* It is an ASCII name, do an ASCII to
- * unicode conversion */
- const char *ascii_oh_name = (const char *)oh_name;
- int n = buff_size - 1;
- while (n > 0 && *ascii_oh_name) {
- *name = *ascii_oh_name;
- name++;
- ascii_oh_name++;
- n--;
- }
- } else {
- strncpy(name, oh_name + 1, buff_size - 1);
- }
- } else {
-#else
- (void) dev;
- {
-#endif
- strncpy(name, oh_name, buff_size - 1);
- }
-}
-
-static void yaffs_load_oh_from_name(struct yaffs_dev *dev, YCHAR *oh_name,
- const YCHAR *name)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
-
- int is_ascii;
- const YCHAR *w;
-
- if (dev->param.auto_unicode) {
-
- is_ascii = 1;
- w = name;
-
- /* Figure out if the name will fit in ascii character set */
- while (is_ascii && *w) {
- if ((*w) & 0xff00)
- is_ascii = 0;
- w++;
- }
-
- if (is_ascii) {
- /* It is an ASCII name, so convert unicode to ascii */
- char *ascii_oh_name = (char *)oh_name;
- int n = YAFFS_MAX_NAME_LENGTH - 1;
- while (n > 0 && *name) {
- *ascii_oh_name = *name;
- name++;
- ascii_oh_name++;
- n--;
- }
- } else {
- /* Unicode name, so save starting at the second YCHAR */
- *oh_name = 0;
- strncpy(oh_name + 1, name, YAFFS_MAX_NAME_LENGTH - 2);
- }
- } else {
-#else
- dev = dev;
- {
-#endif
- strncpy(oh_name, name, YAFFS_MAX_NAME_LENGTH - 1);
- }
-}
-
-static u16 yaffs_calc_name_sum(const YCHAR *name)
-{
- u16 sum = 0;
- u16 i = 1;
-
- if (!name)
- return 0;
-
- while ((*name) && i < (YAFFS_MAX_NAME_LENGTH / 2)) {
-
- /* 0x1f mask is case insensitive */
- sum += ((*name) & 0x1f) * i;
- i++;
- name++;
- }
- return sum;
-}
-
-
-void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR * name)
-{
- memset(obj->short_name, 0, sizeof(obj->short_name));
-
- if (name && !name[0]) {
- yaffs_fix_null_name(obj, obj->short_name,
- YAFFS_SHORT_NAME_LENGTH);
- name = obj->short_name;
- } else if (name &&
- strnlen(name, YAFFS_SHORT_NAME_LENGTH + 1) <=
- YAFFS_SHORT_NAME_LENGTH) {
- strcpy(obj->short_name, name);
- }
-
- obj->sum = yaffs_calc_name_sum(name);
-}
-
-void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
- const struct yaffs_obj_hdr *oh)
-{
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
- YCHAR tmp_name[YAFFS_MAX_NAME_LENGTH + 1];
- memset(tmp_name, 0, sizeof(tmp_name));
- yaffs_load_name_from_oh(obj->my_dev, tmp_name, oh->name,
- YAFFS_MAX_NAME_LENGTH + 1);
- yaffs_set_obj_name(obj, tmp_name);
-#else
- yaffs_set_obj_name(obj, oh->name);
-#endif
-}
-
-loff_t yaffs_max_file_size(struct yaffs_dev *dev)
-{
- if(sizeof(loff_t) < 8)
- return YAFFS_MAX_FILE_SIZE_32;
- else
- return ((loff_t) YAFFS_MAX_CHUNK_ID) * dev->data_bytes_per_chunk;
-}
-
-/*-------------------- TNODES -------------------
-
- * List of spare tnodes
- * The list is hooked together using the first pointer
- * in the tnode.
- */
-
-struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev)
-{
- struct yaffs_tnode *tn = yaffs_alloc_raw_tnode(dev);
-
- if (tn) {
- memset(tn, 0, dev->tnode_size);
- dev->n_tnodes++;
- }
-
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-
- return tn;
-}
-
-/* FreeTnode frees up a tnode and puts it back on the free list */
-static void yaffs_free_tnode(struct yaffs_dev *dev, struct yaffs_tnode *tn)
-{
- yaffs_free_raw_tnode(dev, tn);
- dev->n_tnodes--;
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-}
-
-static void yaffs_deinit_tnodes_and_objs(struct yaffs_dev *dev)
-{
- yaffs_deinit_raw_tnodes_and_objs(dev);
- dev->n_obj = 0;
- dev->n_tnodes = 0;
-}
-
-static void yaffs_load_tnode_0(struct yaffs_dev *dev, struct yaffs_tnode *tn,
- unsigned pos, unsigned val)
-{
- u32 *map = (u32 *) tn;
- u32 bit_in_map;
- u32 bit_in_word;
- u32 word_in_map;
- u32 mask;
-
- pos &= YAFFS_TNODES_LEVEL0_MASK;
- val >>= dev->chunk_grp_bits;
-
- bit_in_map = pos * dev->tnode_width;
- word_in_map = bit_in_map / 32;
- bit_in_word = bit_in_map & (32 - 1);
-
- mask = dev->tnode_mask << bit_in_word;
-
- map[word_in_map] &= ~mask;
- map[word_in_map] |= (mask & (val << bit_in_word));
-
- if (dev->tnode_width > (32 - bit_in_word)) {
- bit_in_word = (32 - bit_in_word);
- word_in_map++;
- mask =
- dev->tnode_mask >> bit_in_word;
- map[word_in_map] &= ~mask;
- map[word_in_map] |= (mask & (val >> bit_in_word));
- }
-}
-
-u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
- unsigned pos)
-{
- u32 *map = (u32 *) tn;
- u32 bit_in_map;
- u32 bit_in_word;
- u32 word_in_map;
- u32 val;
-
- pos &= YAFFS_TNODES_LEVEL0_MASK;
-
- bit_in_map = pos * dev->tnode_width;
- word_in_map = bit_in_map / 32;
- bit_in_word = bit_in_map & (32 - 1);
-
- val = map[word_in_map] >> bit_in_word;
-
- if (dev->tnode_width > (32 - bit_in_word)) {
- bit_in_word = (32 - bit_in_word);
- word_in_map++;
- val |= (map[word_in_map] << bit_in_word);
- }
-
- val &= dev->tnode_mask;
- val <<= dev->chunk_grp_bits;
-
- 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 top_level
- * in the tree. 0 means only the level 0 tnode is in the tree.
- */
-
-/* FindLevel0Tnode finds the level 0 tnode, if one exists. */
-struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct,
- u32 chunk_id)
-{
- struct yaffs_tnode *tn = file_struct->top;
- u32 i;
- int required_depth;
- int level = file_struct->top_level;
-
- (void) dev;
-
- /* Check sane level and chunk Id */
- if (level < 0 || level > YAFFS_TNODES_MAX_LEVEL)
- return NULL;
-
- if (chunk_id > YAFFS_MAX_CHUNK_ID)
- return NULL;
-
- /* First check we're tall enough (ie enough top_level) */
-
- i = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
- required_depth = 0;
- while (i) {
- i >>= YAFFS_TNODES_INTERNAL_BITS;
- required_depth++;
- }
-
- if (required_depth > file_struct->top_level)
- return NULL; /* Not tall enough, so we can't find it */
-
- /* Traverse down to level 0 */
- while (level > 0 && tn) {
- tn = tn->internal[(chunk_id >>
- (YAFFS_TNODES_LEVEL0_BITS +
- (level - 1) *
- YAFFS_TNODES_INTERNAL_BITS)) &
- YAFFS_TNODES_INTERNAL_MASK];
- level--;
- }
-
- return tn;
-}
-
-/* add_find_tnode_0 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.
- */
-
-struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct,
- u32 chunk_id,
- struct yaffs_tnode *passed_tn)
-{
- int required_depth;
- int i;
- int l;
- struct yaffs_tnode *tn;
- u32 x;
-
- /* Check sane level and page Id */
- if (file_struct->top_level < 0 ||
- file_struct->top_level > YAFFS_TNODES_MAX_LEVEL)
- return NULL;
-
- if (chunk_id > YAFFS_MAX_CHUNK_ID)
- return NULL;
-
- /* First check we're tall enough (ie enough top_level) */
-
- x = chunk_id >> YAFFS_TNODES_LEVEL0_BITS;
- required_depth = 0;
- while (x) {
- x >>= YAFFS_TNODES_INTERNAL_BITS;
- required_depth++;
- }
-
- if (required_depth > file_struct->top_level) {
- /* Not tall enough, gotta make the tree taller */
- for (i = file_struct->top_level; i < required_depth; i++) {
-
- tn = yaffs_get_tnode(dev);
-
- if (tn) {
- tn->internal[0] = file_struct->top;
- file_struct->top = tn;
- file_struct->top_level++;
- } else {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs: no more tnodes");
- return NULL;
- }
- }
- }
-
- /* Traverse down to level 0, adding anything we need */
-
- l = file_struct->top_level;
- tn = file_struct->top;
-
- if (l > 0) {
- while (l > 0 && tn) {
- x = (chunk_id >>
- (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_get_tnode(dev);
- if (!tn->internal[x])
- return NULL;
- } else if (l == 1) {
- /* Looking from level 1 at level 0 */
- if (passed_tn) {
- /* If we already have one, release it */
- if (tn->internal[x])
- yaffs_free_tnode(dev,
- tn->internal[x]);
- tn->internal[x] = passed_tn;
-
- } else if (!tn->internal[x]) {
- /* Don't have one, none passed in */
- tn->internal[x] = yaffs_get_tnode(dev);
- if (!tn->internal[x])
- return NULL;
- }
- }
-
- tn = tn->internal[x];
- l--;
- }
- } else {
- /* top is level 0 */
- if (passed_tn) {
- memcpy(tn, passed_tn,
- (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8);
- yaffs_free_tnode(dev, passed_tn);
- }
- }
-
- return tn;
-}
-
-static int yaffs_tags_match(const struct yaffs_ext_tags *tags, int obj_id,
- int chunk_obj)
-{
- return (tags->chunk_id == chunk_obj &&
- tags->obj_id == obj_id &&
- !tags->is_deleted) ? 1 : 0;
-
-}
-
-static int yaffs_find_chunk_in_group(struct yaffs_dev *dev, int the_chunk,
- struct yaffs_ext_tags *tags, int obj_id,
- int inode_chunk)
-{
- int j;
-
- for (j = 0; the_chunk && j < dev->chunk_grp_size; j++) {
- if (yaffs_check_chunk_bit
- (dev, the_chunk / dev->param.chunks_per_block,
- the_chunk % dev->param.chunks_per_block)) {
-
- if (dev->chunk_grp_size == 1)
- return the_chunk;
- else {
- yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
- tags);
- if (yaffs_tags_match(tags,
- obj_id, inode_chunk)) {
- /* found it; */
- return the_chunk;
- }
- }
- }
- the_chunk++;
- }
- return -1;
-}
-
-int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags)
-{
- /*Get the Tnode, then get the level 0 offset chunk offset */
- struct yaffs_tnode *tn;
- int the_chunk = -1;
- struct yaffs_ext_tags local_tags;
- int ret_val = -1;
- struct yaffs_dev *dev = in->my_dev;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &local_tags;
- }
-
- tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
- if (!tn)
- return ret_val;
-
- the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
- inode_chunk);
- return ret_val;
-}
-
-static int yaffs_find_del_file_chunk(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags)
-{
- /* Get the Tnode, then get the level 0 offset chunk offset */
- struct yaffs_tnode *tn;
- int the_chunk = -1;
- struct yaffs_ext_tags local_tags;
- struct yaffs_dev *dev = in->my_dev;
- int ret_val = -1;
-
- if (!tags) {
- /* Passed a NULL, so use our own tags space */
- tags = &local_tags;
- }
-
- tn = yaffs_find_tnode_0(dev, &in->variant.file_variant, inode_chunk);
-
- if (!tn)
- return ret_val;
-
- the_chunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- ret_val = yaffs_find_chunk_in_group(dev, the_chunk, tags, in->obj_id,
- inode_chunk);
-
- /* Delete the entry in the filestructure (if found) */
- if (ret_val != -1)
- yaffs_load_tnode_0(dev, tn, inode_chunk, 0);
-
- return ret_val;
-}
-
-int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- int nand_chunk, int in_scan)
-{
- /* NB in_scan is zero unless scanning.
- * For forward scanning, in_scan is > 0;
- * for backward scanning in_scan is < 0
- *
- * nand_chunk = 0 is a dummy insert to make sure the tnodes are there.
- */
-
- struct yaffs_tnode *tn;
- struct yaffs_dev *dev = in->my_dev;
- int existing_cunk;
- struct yaffs_ext_tags existing_tags;
- struct yaffs_ext_tags new_tags;
- unsigned existing_serial, new_serial;
-
- if (in->variant_type != 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 (!in_scan) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy:attempt to put data chunk into a non-file"
- );
- BUG();
- }
-
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- return YAFFS_OK;
- }
-
- tn = yaffs_add_find_tnode_0(dev,
- &in->variant.file_variant,
- inode_chunk, NULL);
- if (!tn)
- return YAFFS_FAIL;
-
- if (!nand_chunk)
- /* Dummy insert, bail now */
- return YAFFS_OK;
-
- existing_cunk = yaffs_get_group_base(dev, tn, inode_chunk);
-
- if (in_scan != 0) {
- /* If we're scanning then we need to test for duplicates
- * NB This does not need to be efficient since it should only
- * 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.
- */
-
- if (existing_cunk > 0) {
- /* NB Right now existing chunk will not be real
- * chunk_id 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.
- * YAFFS1: Get both sets of tags and compare serial
- * numbers.
- */
-
- if (in_scan > 0) {
- /* Only do this for forward scanning */
- yaffs_rd_chunk_tags_nand(dev,
- nand_chunk,
- NULL, &new_tags);
-
- /* Do a proper find */
- existing_cunk =
- yaffs_find_chunk_in_file(in, inode_chunk,
- &existing_tags);
- }
-
- if (existing_cunk <= 0) {
- /*Hoosterman - how did this happen? */
-
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: existing chunk < 0 in scan"
- );
-
- }
-
- /* NB The deleted flags should be false, otherwise
- * the chunks will not be loaded during a scan
- */
-
- if (in_scan > 0) {
- new_serial = new_tags.serial_number;
- existing_serial = existing_tags.serial_number;
- }
-
- if ((in_scan > 0) &&
- (existing_cunk <= 0 ||
- ((existing_serial + 1) & 3) == new_serial)) {
- /* Forward scanning.
- * Use new
- * Delete the old one and drop through to
- * update the tnode
- */
- yaffs_chunk_del(dev, existing_cunk, 1,
- __LINE__);
- } else {
- /* Backward scanning or we want to use the
- * existing one
- * Delete the new one and return early so that
- * the tnode isn't changed
- */
- yaffs_chunk_del(dev, nand_chunk, 1, __LINE__);
- return YAFFS_OK;
- }
- }
-
- }
-
- if (existing_cunk == 0)
- in->n_data_chunks++;
-
- yaffs_load_tnode_0(dev, tn, inode_chunk, nand_chunk);
-
- return YAFFS_OK;
-}
-
-static void yaffs_soft_del_chunk(struct yaffs_dev *dev, int chunk)
-{
- struct yaffs_block_info *the_block;
- unsigned block_no;
-
- yaffs_trace(YAFFS_TRACE_DELETION, "soft delete chunk %d", chunk);
-
- block_no = chunk / dev->param.chunks_per_block;
- the_block = yaffs_get_block_info(dev, block_no);
- if (the_block) {
- the_block->soft_del_pages++;
- dev->n_free_chunks++;
- yaffs2_update_oldest_dirty_seq(dev, block_no, the_block);
- }
-}
-
-/* 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_soft_del_worker(struct yaffs_obj *in, struct yaffs_tnode *tn,
- u32 level, int chunk_offset)
-{
- int i;
- int the_chunk;
- int all_done = 1;
- struct yaffs_dev *dev = in->my_dev;
-
- if (!tn)
- return 1;
-
- if (level > 0) {
- for (i = YAFFS_NTNODES_INTERNAL - 1;
- all_done && i >= 0;
- i--) {
- if (tn->internal[i]) {
- all_done =
- yaffs_soft_del_worker(in,
- tn->internal[i],
- level - 1,
- (chunk_offset <<
- YAFFS_TNODES_INTERNAL_BITS)
- + i);
- if (all_done) {
- yaffs_free_tnode(dev,
- tn->internal[i]);
- tn->internal[i] = NULL;
- } else {
- /* Can this happen? */
- }
- }
- }
- return (all_done) ? 1 : 0;
- }
-
- /* level 0 */
- for (i = YAFFS_NTNODES_LEVEL0 - 1; i >= 0; i--) {
- the_chunk = yaffs_get_group_base(dev, tn, i);
- if (the_chunk) {
- yaffs_soft_del_chunk(dev, the_chunk);
- yaffs_load_tnode_0(dev, tn, i, 0);
- }
- }
- return 1;
-}
-
-static void yaffs_remove_obj_from_dir(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev = obj->my_dev;
- struct yaffs_obj *parent;
-
- yaffs_verify_obj_in_dir(obj);
- parent = obj->parent;
-
- yaffs_verify_dir(parent);
-
- if (dev && dev->param.remove_obj_fn)
- dev->param.remove_obj_fn(obj);
-
- list_del_init(&obj->siblings);
- obj->parent = NULL;
-
- yaffs_verify_dir(parent);
-}
-
-void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj)
-{
- if (!directory) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: Trying to add an object to a null pointer directory"
- );
- BUG();
- return;
- }
- if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: Trying to add an object to a non-directory"
- );
- BUG();
- }
-
- if (obj->siblings.prev == NULL) {
- /* Not initialised */
- BUG();
- }
-
- yaffs_verify_dir(directory);
-
- yaffs_remove_obj_from_dir(obj);
-
- /* Now add it */
- list_add(&obj->siblings, &directory->variant.dir_variant.children);
- obj->parent = directory;
-
- if (directory == obj->my_dev->unlinked_dir
- || directory == obj->my_dev->del_dir) {
- obj->unlinked = 1;
- obj->my_dev->n_unlinked_files++;
- obj->rename_allowed = 0;
- }
-
- yaffs_verify_dir(directory);
- yaffs_verify_obj_in_dir(obj);
-}
-
-static int yaffs_change_obj_name(struct yaffs_obj *obj,
- struct yaffs_obj *new_dir,
- const YCHAR *new_name, int force, int shadows)
-{
- int unlink_op;
- int del_op;
- struct yaffs_obj *existing_target;
-
- if (new_dir == NULL)
- new_dir = obj->parent; /* use the old directory */
-
- if (new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: yaffs_change_obj_name: new_dir is not a directory"
- );
- BUG();
- }
-
- unlink_op = (new_dir == obj->my_dev->unlinked_dir);
- del_op = (new_dir == obj->my_dev->del_dir);
-
- existing_target = yaffs_find_by_name(new_dir, new_name);
-
- /* If the object is a file going into the unlinked directory,
- * then it is OK to just stuff it in since duplicate names are OK.
- * else only proceed if the new name does not exist and we're putting
- * it into a directory.
- */
- if (!(unlink_op || del_op || force ||
- shadows > 0 || !existing_target) ||
- new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- return YAFFS_FAIL;
-
- yaffs_set_obj_name(obj, new_name);
- obj->dirty = 1;
- yaffs_add_obj_to_dir(new_dir, obj);
-
- if (unlink_op)
- obj->unlinked = 1;
-
- /* If it is a deletion then we mark it as a shrink for gc */
- if (yaffs_update_oh(obj, new_name, 0, del_op, shadows, NULL) >= 0)
- return YAFFS_OK;
-
- return YAFFS_FAIL;
-}
-
-/*------------------------ Short Operations Cache ------------------------------
- * In many situations where there is no high level buffering 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 and the short op cache
- * provides write buffering.
- *
- * There are a small number (~10) of cache chunks per device so that we don't
- * need a very intelligent search.
- */
-
-static int yaffs_obj_cache_dirty(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev = obj->my_dev;
- int i;
- struct yaffs_cache *cache;
- int n_caches = obj->my_dev->param.n_caches;
-
- for (i = 0; i < n_caches; i++) {
- cache = &dev->cache[i];
- if (cache->object == obj && cache->dirty)
- return 1;
- }
-
- return 0;
-}
-
-static void yaffs_flush_single_cache(struct yaffs_cache *cache, int discard)
-{
-
- if (!cache || cache->locked)
- return;
-
- /* Write it out and free it up if need be.*/
- if (cache->dirty) {
- yaffs_wr_data_obj(cache->object,
- cache->chunk_id,
- cache->data,
- cache->n_bytes,
- 1);
-
- cache->dirty = 0;
- }
-
- if (discard)
- cache->object = NULL;
-}
-
-static void yaffs_flush_file_cache(struct yaffs_obj *obj, int discard)
-{
- struct yaffs_dev *dev = obj->my_dev;
- int i;
- struct yaffs_cache *cache;
- int n_caches = obj->my_dev->param.n_caches;
-
- if (n_caches < 1)
- return;
-
-
- /* Find the chunks for this object and flush them. */
- for (i = 0; i < n_caches; i++) {
- cache = &dev->cache[i];
- if (cache->object == obj)
- yaffs_flush_single_cache(cache, discard);
- }
-
-}
-
-
-void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard)
-{
- struct yaffs_obj *obj;
- int n_caches = dev->param.n_caches;
- 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 < n_caches && !obj; i++) {
- if (dev->cache[i].object && dev->cache[i].dirty)
- obj = dev->cache[i].object;
- }
- if (obj)
- yaffs_flush_file_cache(obj, discard);
- } while (obj);
-
-}
-
-/* Grab us an unused 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 struct yaffs_cache *yaffs_grab_chunk_worker(struct yaffs_dev *dev)
-{
- int i;
-
- if (dev->param.n_caches > 0) {
- for (i = 0; i < dev->param.n_caches; i++) {
- if (!dev->cache[i].object)
- return &dev->cache[i];
- }
- }
-
- return NULL;
-}
-
-static struct yaffs_cache *yaffs_grab_chunk_cache(struct yaffs_dev *dev)
-{
- struct yaffs_cache *cache;
- int usage;
- int i;
-
- if (dev->param.n_caches < 1)
- return NULL;
-
- /* First look for an unused cache */
-
- cache = yaffs_grab_chunk_worker(dev);
-
- if (cache)
- return cache;
-
- /*
- * Thery were all in use.
- * Find the LRU cache and flush it if it is dirty.
- */
-
- usage = -1;
- cache = NULL;
-
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object &&
- !dev->cache[i].locked &&
- (dev->cache[i].last_use < usage || !cache)) {
- usage = dev->cache[i].last_use;
- cache = &dev->cache[i];
- }
- }
-
-#if 1
- yaffs_flush_single_cache(cache, 1);
-#else
- yaffs_flush_file_cache(cache->object, 1);
- cache = yaffs_grab_chunk_worker(dev);
-#endif
-
- return cache;
-}
-
-/* Find a cached chunk */
-static struct yaffs_cache *yaffs_find_chunk_cache(const struct yaffs_obj *obj,
- int chunk_id)
-{
- struct yaffs_dev *dev = obj->my_dev;
- int i;
-
- if (dev->param.n_caches < 1)
- return NULL;
-
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object == obj &&
- dev->cache[i].chunk_id == chunk_id) {
- dev->cache_hits++;
-
- return &dev->cache[i];
- }
- }
- return NULL;
-}
-
-/* Mark the chunk for the least recently used algorithym */
-static void yaffs_use_cache(struct yaffs_dev *dev, struct yaffs_cache *cache,
- int is_write)
-{
- int i;
-
- if (dev->param.n_caches < 1)
- return;
-
- if (dev->cache_last_use < 0 ||
- dev->cache_last_use > 100000000) {
- /* Reset the cache usages */
- for (i = 1; i < dev->param.n_caches; i++)
- dev->cache[i].last_use = 0;
-
- dev->cache_last_use = 0;
- }
- dev->cache_last_use++;
- cache->last_use = dev->cache_last_use;
-
- if (is_write)
- 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_invalidate_chunk_cache(struct yaffs_obj *object, int chunk_id)
-{
- struct yaffs_cache *cache;
-
- if (object->my_dev->param.n_caches > 0) {
- cache = yaffs_find_chunk_cache(object, chunk_id);
-
- if (cache)
- cache->object = NULL;
- }
-}
-
-/* Invalidate all the cache pages associated with this object
- * Do this whenever ther file is deleted or resized.
- */
-static void yaffs_invalidate_whole_cache(struct yaffs_obj *in)
-{
- int i;
- struct yaffs_dev *dev = in->my_dev;
-
- if (dev->param.n_caches > 0) {
- /* Invalidate it. */
- for (i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].object == in)
- dev->cache[i].object = NULL;
- }
- }
-}
-
-static void yaffs_unhash_obj(struct yaffs_obj *obj)
-{
- int bucket;
- struct yaffs_dev *dev = obj->my_dev;
-
- /* If it is still linked into the bucket list, free from the list */
- if (!list_empty(&obj->hash_link)) {
- list_del_init(&obj->hash_link);
- bucket = yaffs_hash_fn(obj->obj_id);
- dev->obj_bucket[bucket].count--;
- }
-}
-
-/* FreeObject frees up a Object and puts it back on the free list */
-static void yaffs_free_obj(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev;
-
- if (!obj) {
- BUG();
- return;
- }
- dev = obj->my_dev;
- yaffs_trace(YAFFS_TRACE_OS, "FreeObject %p inode %p",
- obj, obj->my_inode);
- if (obj->parent)
- BUG();
- if (!list_empty(&obj->siblings))
- BUG();
-
- if (obj->my_inode) {
- /* We're still hooked up to a cached inode.
- * Don't delete now, but mark for later deletion
- */
- obj->defered_free = 1;
- return;
- }
-
- yaffs_unhash_obj(obj);
-
- yaffs_free_raw_obj(dev, obj);
- dev->n_obj--;
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-}
-
-void yaffs_handle_defered_free(struct yaffs_obj *obj)
-{
- if (obj->defered_free)
- yaffs_free_obj(obj);
-}
-
-static int yaffs_generic_obj_del(struct yaffs_obj *in)
-{
- /* Iinvalidate the file's data in the cache, without flushing. */
- yaffs_invalidate_whole_cache(in);
-
- if (in->my_dev->param.is_yaffs2 && in->parent != in->my_dev->del_dir) {
- /* Move to unlinked directory so we have a deletion record */
- yaffs_change_obj_name(in, in->my_dev->del_dir, _Y("deleted"), 0,
- 0);
- }
-
- yaffs_remove_obj_from_dir(in);
- yaffs_chunk_del(in->my_dev, in->hdr_chunk, 1, __LINE__);
- in->hdr_chunk = 0;
-
- yaffs_free_obj(in);
- return YAFFS_OK;
-
-}
-
-static void yaffs_soft_del_file(struct yaffs_obj *obj)
-{
- if (!obj->deleted ||
- obj->variant_type != YAFFS_OBJECT_TYPE_FILE ||
- obj->soft_del)
- return;
-
- if (obj->n_data_chunks <= 0) {
- /* Empty file with no duplicate object headers,
- * just delete it immediately */
- yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
- obj->variant.file_variant.top = NULL;
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: Deleting empty file %d",
- obj->obj_id);
- yaffs_generic_obj_del(obj);
- } else {
- yaffs_soft_del_worker(obj,
- obj->variant.file_variant.top,
- obj->variant.
- file_variant.top_level, 0);
- obj->soft_del = 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.
- *
- * 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 struct yaffs_tnode *yaffs_prune_worker(struct yaffs_dev *dev,
- struct yaffs_tnode *tn, u32 level,
- int del0)
-{
- int i;
- int has_data;
-
- if (!tn)
- return tn;
-
- has_data = 0;
-
- if (level > 0) {
- for (i = 0; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i]) {
- tn->internal[i] =
- yaffs_prune_worker(dev,
- tn->internal[i],
- level - 1,
- (i == 0) ? del0 : 1);
- }
-
- if (tn->internal[i])
- has_data++;
- }
- } else {
- int tnode_size_u32 = dev->tnode_size / sizeof(u32);
- u32 *map = (u32 *) tn;
-
- for (i = 0; !has_data && i < tnode_size_u32; i++) {
- if (map[i])
- has_data++;
- }
- }
-
- if (has_data == 0 && del0) {
- /* Free and return NULL */
- yaffs_free_tnode(dev, tn);
- tn = NULL;
- }
- return tn;
-}
-
-static int yaffs_prune_tree(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct)
-{
- int i;
- int has_data;
- int done = 0;
- struct yaffs_tnode *tn;
-
- if (file_struct->top_level < 1)
- return YAFFS_OK;
-
- file_struct->top =
- yaffs_prune_worker(dev, file_struct->top, file_struct->top_level, 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 (file_struct->top_level && !done) {
- tn = file_struct->top;
-
- has_data = 0;
- for (i = 1; i < YAFFS_NTNODES_INTERNAL; i++) {
- if (tn->internal[i])
- has_data++;
- }
-
- if (!has_data) {
- file_struct->top = tn->internal[0];
- file_struct->top_level--;
- yaffs_free_tnode(dev, tn);
- } else {
- done = 1;
- }
- }
-
- return YAFFS_OK;
-}
-
-/*-------------------- End of File Structure functions.-------------------*/
-
-/* alloc_empty_obj gets us a clean Object.*/
-static struct yaffs_obj *yaffs_alloc_empty_obj(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj = yaffs_alloc_raw_obj(dev);
-
- if (!obj)
- return obj;
-
- dev->n_obj++;
-
- /* Now sweeten it up... */
-
- memset(obj, 0, sizeof(struct yaffs_obj));
- obj->being_created = 1;
-
- obj->my_dev = dev;
- obj->hdr_chunk = 0;
- obj->variant_type = YAFFS_OBJECT_TYPE_UNKNOWN;
- INIT_LIST_HEAD(&(obj->hard_links));
- INIT_LIST_HEAD(&(obj->hash_link));
- INIT_LIST_HEAD(&obj->siblings);
-
- /* Now make the directory sane */
- if (dev->root_dir) {
- obj->parent = dev->root_dir;
- list_add(&(obj->siblings),
- &dev->root_dir->variant.dir_variant.children);
- }
-
- /* Add it to the lost and found directory.
- * NB Can't put root or lost-n-found in lost-n-found so
- * check if lost-n-found exists first
- */
- if (dev->lost_n_found)
- yaffs_add_obj_to_dir(dev->lost_n_found, obj);
-
- obj->being_created = 0;
-
- dev->checkpoint_blocks_required = 0; /* force recalculation */
-
- return obj;
-}
-
-static int yaffs_find_nice_bucket(struct yaffs_dev *dev)
-{
- int i;
- int l = 999;
- int lowest = 999999;
-
- /* Search for the shortest list or one that
- * isn't too long.
- */
-
- for (i = 0; i < 10 && lowest > 4; i++) {
- dev->bucket_finder++;
- dev->bucket_finder %= YAFFS_NOBJECT_BUCKETS;
- if (dev->obj_bucket[dev->bucket_finder].count < lowest) {
- lowest = dev->obj_bucket[dev->bucket_finder].count;
- l = dev->bucket_finder;
- }
- }
-
- return l;
-}
-
-static int yaffs_new_obj_id(struct yaffs_dev *dev)
-{
- int bucket = yaffs_find_nice_bucket(dev);
- int found = 0;
- struct list_head *i;
- u32 n = (u32) bucket;
-
- /*
- * Now find an object value that has not already been taken
- * by scanning the list, incrementing each time by number of buckets.
- */
- while (!found) {
- found = 1;
- n += YAFFS_NOBJECT_BUCKETS;
- list_for_each(i, &dev->obj_bucket[bucket].list) {
- /* Check if this value is already taken. */
- if (i && list_entry(i, struct yaffs_obj,
- hash_link)->obj_id == n)
- found = 0;
- }
- }
- return n;
-}
-
-static void yaffs_hash_obj(struct yaffs_obj *in)
-{
- int bucket = yaffs_hash_fn(in->obj_id);
- struct yaffs_dev *dev = in->my_dev;
-
- list_add(&in->hash_link, &dev->obj_bucket[bucket].list);
- dev->obj_bucket[bucket].count++;
-}
-
-struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number)
-{
- int bucket = yaffs_hash_fn(number);
- struct list_head *i;
- struct yaffs_obj *in;
-
- list_for_each(i, &dev->obj_bucket[bucket].list) {
- /* Look if it is in the list */
- in = list_entry(i, struct yaffs_obj, hash_link);
- if (in->obj_id == number) {
- /* Don't show if it is defered free */
- if (in->defered_free)
- return NULL;
- return in;
- }
- }
-
- return NULL;
-}
-
-static struct yaffs_obj *yaffs_new_obj(struct yaffs_dev *dev, int number,
- enum yaffs_obj_type type)
-{
- struct yaffs_obj *the_obj = NULL;
- struct yaffs_tnode *tn = NULL;
-
- if (number < 0)
- number = yaffs_new_obj_id(dev);
-
- if (type == YAFFS_OBJECT_TYPE_FILE) {
- tn = yaffs_get_tnode(dev);
- if (!tn)
- return NULL;
- }
-
- the_obj = yaffs_alloc_empty_obj(dev);
- if (!the_obj) {
- if (tn)
- yaffs_free_tnode(dev, tn);
- return NULL;
- }
-
- the_obj->fake = 0;
- the_obj->rename_allowed = 1;
- the_obj->unlink_allowed = 1;
- the_obj->obj_id = number;
- yaffs_hash_obj(the_obj);
- the_obj->variant_type = type;
- yaffs_load_current_time(the_obj, 1, 1);
-
- switch (type) {
- case YAFFS_OBJECT_TYPE_FILE:
- the_obj->variant.file_variant.file_size = 0;
- the_obj->variant.file_variant.scanned_size = 0;
- the_obj->variant.file_variant.shrink_size =
- yaffs_max_file_size(dev);
- the_obj->variant.file_variant.top_level = 0;
- the_obj->variant.file_variant.top = tn;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- INIT_LIST_HEAD(&the_obj->variant.dir_variant.children);
- INIT_LIST_HEAD(&the_obj->variant.dir_variant.dirty);
- 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 the_obj;
-}
-
-static struct yaffs_obj *yaffs_create_fake_dir(struct yaffs_dev *dev,
- int number, u32 mode)
-{
-
- struct yaffs_obj *obj =
- yaffs_new_obj(dev, number, YAFFS_OBJECT_TYPE_DIRECTORY);
-
- if (!obj)
- return NULL;
-
- obj->fake = 1; /* it is fake so it might not use NAND */
- obj->rename_allowed = 0;
- obj->unlink_allowed = 0;
- obj->deleted = 0;
- obj->unlinked = 0;
- obj->yst_mode = mode;
- obj->my_dev = dev;
- obj->hdr_chunk = 0; /* Not a valid chunk. */
- return obj;
-
-}
-
-
-static void yaffs_init_tnodes_and_objs(struct yaffs_dev *dev)
-{
- int i;
-
- dev->n_obj = 0;
- dev->n_tnodes = 0;
- yaffs_init_raw_tnodes_and_objs(dev);
-
- for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
- INIT_LIST_HEAD(&dev->obj_bucket[i].list);
- dev->obj_bucket[i].count = 0;
- }
-}
-
-struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
- int number,
- enum yaffs_obj_type type)
-{
- struct yaffs_obj *the_obj = NULL;
-
- if (number > 0)
- the_obj = yaffs_find_by_number(dev, number);
-
- if (!the_obj)
- the_obj = yaffs_new_obj(dev, number, type);
-
- return the_obj;
-
-}
-
-YCHAR *yaffs_clone_str(const YCHAR *str)
-{
- YCHAR *new_str = NULL;
- int len;
-
- if (!str)
- str = _Y("");
-
- len = strnlen(str, YAFFS_MAX_ALIAS_LENGTH);
- new_str = kmalloc((len + 1) * sizeof(YCHAR), GFP_NOFS);
- if (new_str) {
- strncpy(new_str, str, len);
- new_str[len] = 0;
- }
- return new_str;
-
-}
-/*
- *yaffs_update_parent() 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_update_dirty_dirs must be
- * called periodically.
- */
-
-static void yaffs_update_parent(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev;
-
- if (!obj)
- return;
- dev = obj->my_dev;
- obj->dirty = 1;
- yaffs_load_current_time(obj, 0, 1);
- if (dev->param.defered_dir_update) {
- struct list_head *link = &obj->variant.dir_variant.dirty;
-
- if (list_empty(link)) {
- list_add(link, &dev->dirty_dirs);
- yaffs_trace(YAFFS_TRACE_BACKGROUND,
- "Added object %d to dirty directories",
- obj->obj_id);
- }
-
- } else {
- yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
- }
-}
-
-void yaffs_update_dirty_dirs(struct yaffs_dev *dev)
-{
- struct list_head *link;
- struct yaffs_obj *obj;
- struct yaffs_dir_var *d_s;
- union yaffs_obj_var *o_v;
-
- yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update dirty directories");
-
- while (!list_empty(&dev->dirty_dirs)) {
- link = dev->dirty_dirs.next;
- list_del_init(link);
-
- d_s = list_entry(link, struct yaffs_dir_var, dirty);
- o_v = list_entry(d_s, union yaffs_obj_var, dir_variant);
- obj = list_entry(o_v, struct yaffs_obj, variant);
-
- yaffs_trace(YAFFS_TRACE_BACKGROUND, "Update directory %d",
- obj->obj_id);
-
- if (obj->dirty)
- yaffs_update_oh(obj, NULL, 0, 0, 0, NULL);
- }
-}
-
-/*
- * Mknod (create) a new object.
- * equiv_obj only has meaning for a hard link;
- * alias_str only has meaning for a symlink.
- * rdev only has meaning for devices (a subset of special objects)
- */
-
-static struct yaffs_obj *yaffs_create_obj(enum yaffs_obj_type type,
- struct yaffs_obj *parent,
- const YCHAR *name,
- u32 mode,
- u32 uid,
- u32 gid,
- struct yaffs_obj *equiv_obj,
- const YCHAR *alias_str, u32 rdev)
-{
- struct yaffs_obj *in;
- YCHAR *str = NULL;
- struct yaffs_dev *dev = parent->my_dev;
-
- /* Check if the entry exists.
- * If it does then fail the call since we don't want a dup. */
- if (yaffs_find_by_name(parent, name))
- return NULL;
-
- if (type == YAFFS_OBJECT_TYPE_SYMLINK) {
- str = yaffs_clone_str(alias_str);
- if (!str)
- return NULL;
- }
-
- in = yaffs_new_obj(dev, -1, type);
-
- if (!in) {
- kfree(str);
- return NULL;
- }
-
- in->hdr_chunk = 0;
- in->valid = 1;
- in->variant_type = type;
-
- in->yst_mode = mode;
-
- yaffs_attribs_init(in, gid, uid, rdev);
-
- in->n_data_chunks = 0;
-
- yaffs_set_obj_name(in, name);
- in->dirty = 1;
-
- yaffs_add_obj_to_dir(parent, in);
-
- in->my_dev = parent->my_dev;
-
- switch (type) {
- case YAFFS_OBJECT_TYPE_SYMLINK:
- in->variant.symlink_variant.alias = str;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.hardlink_variant.equiv_obj = equiv_obj;
- in->variant.hardlink_variant.equiv_id = equiv_obj->obj_id;
- list_add(&in->hard_links, &equiv_obj->hard_links);
- 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_update_oh(in, name, 0, 0, 0, NULL) < 0) {
- /* Could not create the object header, fail */
- yaffs_del_obj(in);
- in = NULL;
- }
-
- if (in)
- yaffs_update_parent(parent);
-
- return in;
-}
-
-struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
- const YCHAR *name, u32 mode, u32 uid,
- u32 gid)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_FILE, parent, name, mode,
- uid, gid, NULL, NULL, 0);
-}
-
-struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
- u32 mode, u32 uid, u32 gid)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_DIRECTORY, parent, name,
- mode, uid, gid, NULL, NULL, 0);
-}
-
-struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
- const YCHAR *name, u32 mode, u32 uid,
- u32 gid, u32 rdev)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_SPECIAL, parent, name, mode,
- uid, gid, NULL, NULL, rdev);
-}
-
-struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
- const YCHAR *name, u32 mode, u32 uid,
- u32 gid, const YCHAR *alias)
-{
- return yaffs_create_obj(YAFFS_OBJECT_TYPE_SYMLINK, parent, name, mode,
- uid, gid, NULL, alias, 0);
-}
-
-/* yaffs_link_obj returns the object id of the equivalent object.*/
-struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR * name,
- struct yaffs_obj *equiv_obj)
-{
- /* Get the real object in case we were fed a hard link obj */
- equiv_obj = yaffs_get_equivalent_obj(equiv_obj);
-
- if (yaffs_create_obj(YAFFS_OBJECT_TYPE_HARDLINK,
- parent, name, 0, 0, 0,
- equiv_obj, NULL, 0))
- return equiv_obj;
-
- return NULL;
-
-}
-
-
-
-/*---------------------- Block Management and Page Allocation -------------*/
-
-static void yaffs_deinit_blocks(struct yaffs_dev *dev)
-{
- if (dev->block_info_alt && dev->block_info)
- vfree(dev->block_info);
- else
- kfree(dev->block_info);
-
- dev->block_info_alt = 0;
-
- dev->block_info = NULL;
-
- if (dev->chunk_bits_alt && dev->chunk_bits)
- vfree(dev->chunk_bits);
- else
- kfree(dev->chunk_bits);
- dev->chunk_bits_alt = 0;
- dev->chunk_bits = NULL;
-}
-
-static int yaffs_init_blocks(struct yaffs_dev *dev)
-{
- int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
-
- dev->block_info = NULL;
- dev->chunk_bits = NULL;
- dev->alloc_block = -1; /* force it to get a new one */
-
- /* If the first allocation strategy fails, thry the alternate one */
- dev->block_info =
- kmalloc(n_blocks * sizeof(struct yaffs_block_info), GFP_NOFS);
- if (!dev->block_info) {
- dev->block_info =
- vmalloc(n_blocks * sizeof(struct yaffs_block_info));
- dev->block_info_alt = 1;
- } else {
- dev->block_info_alt = 0;
- }
-
- if (!dev->block_info)
- goto alloc_error;
-
- /* Set up dynamic blockinfo stuff. Round up bytes. */
- dev->chunk_bit_stride = (dev->param.chunks_per_block + 7) / 8;
- dev->chunk_bits =
- kmalloc(dev->chunk_bit_stride * n_blocks, GFP_NOFS);
- if (!dev->chunk_bits) {
- dev->chunk_bits =
- vmalloc(dev->chunk_bit_stride * n_blocks);
- dev->chunk_bits_alt = 1;
- } else {
- dev->chunk_bits_alt = 0;
- }
- if (!dev->chunk_bits)
- goto alloc_error;
-
-
- memset(dev->block_info, 0, n_blocks * sizeof(struct yaffs_block_info));
- memset(dev->chunk_bits, 0, dev->chunk_bit_stride * n_blocks);
- return YAFFS_OK;
-
-alloc_error:
- yaffs_deinit_blocks(dev);
- return YAFFS_FAIL;
-}
-
-
-void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no)
-{
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, block_no);
- int erased_ok = 0;
- int i;
-
- /* If the block is still healthy erase it and mark as clean.
- * If the block has had a data failure, then retire it.
- */
-
- yaffs_trace(YAFFS_TRACE_GC | YAFFS_TRACE_ERASE,
- "yaffs_block_became_dirty block %d state %d %s",
- block_no, bi->block_state,
- (bi->needs_retiring) ? "needs retiring" : "");
-
- yaffs2_clear_oldest_dirty_seq(dev, bi);
-
- bi->block_state = YAFFS_BLOCK_STATE_DIRTY;
-
- /* If this is the block being garbage collected then stop gc'ing */
- if (block_no == dev->gc_block)
- dev->gc_block = 0;
-
- /* If this block is currently the best candidate for gc
- * then drop as a candidate */
- if (block_no == dev->gc_dirtiest) {
- dev->gc_dirtiest = 0;
- dev->gc_pages_in_use = 0;
- }
-
- if (!bi->needs_retiring) {
- yaffs2_checkpt_invalidate(dev);
- erased_ok = yaffs_erase_block(dev, block_no);
- if (!erased_ok) {
- dev->n_erase_failures++;
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>> Erasure failed %d", block_no);
- }
- }
-
- /* Verify erasure if needed */
- if (erased_ok &&
- ((yaffs_trace_mask & YAFFS_TRACE_ERASE) ||
- !yaffs_skip_verification(dev))) {
- for (i = 0; i < dev->param.chunks_per_block; i++) {
- if (!yaffs_check_chunk_erased(dev,
- block_no * dev->param.chunks_per_block + i)) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- ">>Block %d erasure supposedly OK, but chunk %d not erased",
- block_no, i);
- }
- }
- }
-
- if (!erased_ok) {
- /* We lost a block of free space */
- dev->n_free_chunks -= dev->param.chunks_per_block;
- yaffs_retire_block(dev, block_no);
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>> Block %d retired", block_no);
- return;
- }
-
- /* Clean it up... */
- bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
- bi->seq_number = 0;
- dev->n_erased_blocks++;
- bi->pages_in_use = 0;
- bi->soft_del_pages = 0;
- bi->has_shrink_hdr = 0;
- bi->skip_erased_check = 1; /* Clean, so no need to check */
- bi->gc_prioritise = 0;
- bi->has_summary = 0;
-
- yaffs_clear_chunk_bits(dev, block_no);
-
- yaffs_trace(YAFFS_TRACE_ERASE, "Erased block %d", block_no);
-}
-
-static inline int yaffs_gc_process_chunk(struct yaffs_dev *dev,
- struct yaffs_block_info *bi,
- int old_chunk, u8 *buffer)
-{
- int new_chunk;
- int mark_flash = 1;
- struct yaffs_ext_tags tags;
- struct yaffs_obj *object;
- int matching_chunk;
- int ret_val = YAFFS_OK;
-
- memset(&tags, 0, sizeof(tags));
- yaffs_rd_chunk_tags_nand(dev, old_chunk,
- buffer, &tags);
- object = yaffs_find_by_number(dev, tags.obj_id);
-
- yaffs_trace(YAFFS_TRACE_GC_DETAIL,
- "Collecting chunk in block %d, %d %d %d ",
- dev->gc_chunk, tags.obj_id,
- tags.chunk_id, tags.n_bytes);
-
- if (object && !yaffs_skip_verification(dev)) {
- if (tags.chunk_id == 0)
- matching_chunk =
- object->hdr_chunk;
- else if (object->soft_del)
- /* Defeat the test */
- matching_chunk = old_chunk;
- else
- matching_chunk =
- yaffs_find_chunk_in_file
- (object, tags.chunk_id,
- NULL);
-
- if (old_chunk != matching_chunk)
- yaffs_trace(YAFFS_TRACE_ERROR,
- "gc: page in gc mismatch: %d %d %d %d",
- old_chunk,
- matching_chunk,
- tags.obj_id,
- tags.chunk_id);
- }
-
- if (!object) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "page %d in gc has no object: %d %d %d ",
- old_chunk,
- tags.obj_id, tags.chunk_id,
- tags.n_bytes);
- }
-
- if (object &&
- object->deleted &&
- object->soft_del && tags.chunk_id != 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->n_free_chunks--;
- bi->soft_del_pages--;
-
- object->n_data_chunks--;
- if (object->n_data_chunks <= 0) {
- /* remeber to clean up obj */
- dev->gc_cleanup_list[dev->n_clean_ups] = tags.obj_id;
- dev->n_clean_ups++;
- }
- mark_flash = 0;
- } 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.serial_number++;
- dev->n_gc_copies++;
-
- if (tags.chunk_id == 0) {
- /* It is an object Id,
- * We need to nuke the
- * shrinkheader flags since its
- * work is done.
- * Also need to clean up
- * shadowing.
- */
- struct yaffs_obj_hdr *oh;
- oh = (struct yaffs_obj_hdr *) buffer;
-
- oh->is_shrink = 0;
- tags.extra_is_shrink = 0;
- oh->shadows_obj = 0;
- oh->inband_shadowed_obj_id = 0;
- tags.extra_shadows = 0;
-
- /* Update file size */
- if (object->variant_type == YAFFS_OBJECT_TYPE_FILE) {
- yaffs_oh_size_load(oh,
- object->variant.file_variant.file_size);
- tags.extra_file_size =
- object->variant.file_variant.file_size;
- }
-
- yaffs_verify_oh(object, oh, &tags, 1);
- new_chunk =
- yaffs_write_new_chunk(dev, (u8 *) oh, &tags, 1);
- } else {
- new_chunk =
- yaffs_write_new_chunk(dev, buffer, &tags, 1);
- }
-
- if (new_chunk < 0) {
- ret_val = YAFFS_FAIL;
- } else {
-
- /* Now fix up the Tnodes etc. */
-
- if (tags.chunk_id == 0) {
- /* It's a header */
- object->hdr_chunk = new_chunk;
- object->serial = tags.serial_number;
- } else {
- /* It's a data chunk */
- yaffs_put_chunk_in_file(object, tags.chunk_id,
- new_chunk, 0);
- }
- }
- }
- if (ret_val == YAFFS_OK)
- yaffs_chunk_del(dev, old_chunk, mark_flash, __LINE__);
- return ret_val;
-}
-
-static int yaffs_gc_block(struct yaffs_dev *dev, int block, int whole_block)
-{
- int old_chunk;
- int ret_val = YAFFS_OK;
- int i;
- int is_checkpt_block;
- int max_copies;
- int chunks_before = yaffs_get_erased_chunks(dev);
- int chunks_after;
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, block);
-
- is_checkpt_block = (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT);
-
- yaffs_trace(YAFFS_TRACE_TRACING,
- "Collecting block %d, in use %d, shrink %d, whole_block %d",
- block, bi->pages_in_use, bi->has_shrink_hdr,
- whole_block);
-
- /*yaffs_verify_free_chunks(dev); */
-
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL)
- bi->block_state = YAFFS_BLOCK_STATE_COLLECTING;
-
- bi->has_shrink_hdr = 0; /* clear the flag so that the block can erase */
-
- dev->gc_disable = 1;
-
- yaffs_summary_gc(dev, block);
-
- if (is_checkpt_block || !yaffs_still_some_chunks(dev, block)) {
- yaffs_trace(YAFFS_TRACE_TRACING,
- "Collecting block %d that has no chunks in use",
- block);
- yaffs_block_became_dirty(dev, block);
- } else {
-
- u8 *buffer = yaffs_get_temp_buffer(dev);
-
- yaffs_verify_blk(dev, bi, block);
-
- max_copies = (whole_block) ? dev->param.chunks_per_block : 5;
- old_chunk = block * dev->param.chunks_per_block + dev->gc_chunk;
-
- for (/* init already done */ ;
- ret_val == YAFFS_OK &&
- dev->gc_chunk < dev->param.chunks_per_block &&
- (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) &&
- max_copies > 0;
- dev->gc_chunk++, old_chunk++) {
- if (yaffs_check_chunk_bit(dev, block, dev->gc_chunk)) {
- /* Page is in use and might need to be copied */
- max_copies--;
- ret_val = yaffs_gc_process_chunk(dev, bi,
- old_chunk, buffer);
- }
- }
- yaffs_release_temp_buffer(dev, buffer);
- }
-
- yaffs_verify_collected_blk(dev, bi, block);
-
- if (bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
- /*
- * The gc did not complete. Set block state back to FULL
- * because checkpointing does not restore gc.
- */
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- } else {
- /* The gc completed. */
- /* Do any required cleanups */
- for (i = 0; i < dev->n_clean_ups; i++) {
- /* Time to delete the file too */
- struct yaffs_obj *object =
- yaffs_find_by_number(dev, dev->gc_cleanup_list[i]);
- if (object) {
- yaffs_free_tnode(dev,
- object->variant.file_variant.top);
- object->variant.file_variant.top = NULL;
- yaffs_trace(YAFFS_TRACE_GC,
- "yaffs: About to finally delete object %d",
- object->obj_id);
- yaffs_generic_obj_del(object);
- object->my_dev->n_deleted_files--;
- }
-
- }
- chunks_after = yaffs_get_erased_chunks(dev);
- if (chunks_before >= chunks_after)
- yaffs_trace(YAFFS_TRACE_GC,
- "gc did not increase free chunks before %d after %d",
- chunks_before, chunks_after);
- dev->gc_block = 0;
- dev->gc_chunk = 0;
- dev->n_clean_ups = 0;
- }
-
- dev->gc_disable = 0;
-
- return ret_val;
-}
-
-/*
- * find_gc_block() selects the dirtiest block (or close enough)
- * for garbage collection.
- */
-
-static unsigned yaffs_find_gc_block(struct yaffs_dev *dev,
- int aggressive, int background)
-{
- int i;
- int iterations;
- unsigned selected = 0;
- int prioritised = 0;
- int prioritised_exist = 0;
- struct yaffs_block_info *bi;
- int threshold;
-
- /* First let's see if we need to grab a prioritised block */
- if (dev->has_pending_prioritised_gc && !aggressive) {
- dev->gc_dirtiest = 0;
- bi = dev->block_info;
- for (i = dev->internal_start_block;
- i <= dev->internal_end_block && !selected; i++) {
-
- if (bi->gc_prioritise) {
- prioritised_exist = 1;
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
- yaffs_block_ok_for_gc(dev, bi)) {
- selected = i;
- prioritised = 1;
- }
- }
- bi++;
- }
-
- /*
- * 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.
- */
-
- if (prioritised_exist &&
- !selected && dev->oldest_dirty_block > 0)
- selected = dev->oldest_dirty_block;
-
- if (!prioritised_exist) /* None found, so we can clear this */
- dev->has_pending_prioritised_gc = 0;
- }
-
- /* If we're doing aggressive GC then we are happy to take a less-dirty
- * block, and search harder.
- * else (leasurely gc), then we only bother to do this if the
- * block has only a few pages in use.
- */
-
- if (!selected) {
- int pages_used;
- int n_blocks =
- dev->internal_end_block - dev->internal_start_block + 1;
- if (aggressive) {
- threshold = dev->param.chunks_per_block;
- iterations = n_blocks;
- } else {
- int max_threshold;
-
- if (background)
- max_threshold = dev->param.chunks_per_block / 2;
- else
- max_threshold = dev->param.chunks_per_block / 8;
-
- if (max_threshold < YAFFS_GC_PASSIVE_THRESHOLD)
- max_threshold = YAFFS_GC_PASSIVE_THRESHOLD;
-
- threshold = background ? (dev->gc_not_done + 2) * 2 : 0;
- if (threshold < YAFFS_GC_PASSIVE_THRESHOLD)
- threshold = YAFFS_GC_PASSIVE_THRESHOLD;
- if (threshold > max_threshold)
- threshold = max_threshold;
-
- iterations = n_blocks / 16 + 1;
- if (iterations > 100)
- iterations = 100;
- }
-
- for (i = 0;
- i < iterations &&
- (dev->gc_dirtiest < 1 ||
- dev->gc_pages_in_use > YAFFS_GC_GOOD_ENOUGH);
- i++) {
- dev->gc_block_finder++;
- if (dev->gc_block_finder < dev->internal_start_block ||
- dev->gc_block_finder > dev->internal_end_block)
- dev->gc_block_finder =
- dev->internal_start_block;
-
- bi = yaffs_get_block_info(dev, dev->gc_block_finder);
-
- pages_used = bi->pages_in_use - bi->soft_del_pages;
-
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL &&
- pages_used < dev->param.chunks_per_block &&
- (dev->gc_dirtiest < 1 ||
- pages_used < dev->gc_pages_in_use) &&
- yaffs_block_ok_for_gc(dev, bi)) {
- dev->gc_dirtiest = dev->gc_block_finder;
- dev->gc_pages_in_use = pages_used;
- }
- }
-
- if (dev->gc_dirtiest > 0 && dev->gc_pages_in_use <= threshold)
- selected = dev->gc_dirtiest;
- }
-
- /*
- * If nothing has been selected for a while, try the oldest dirty
- * because that's gumming up the works.
- */
-
- if (!selected && dev->param.is_yaffs2 &&
- dev->gc_not_done >= (background ? 10 : 20)) {
- yaffs2_find_oldest_dirty_seq(dev);
- if (dev->oldest_dirty_block > 0) {
- selected = dev->oldest_dirty_block;
- dev->gc_dirtiest = selected;
- dev->oldest_dirty_gc_count++;
- bi = yaffs_get_block_info(dev, selected);
- dev->gc_pages_in_use =
- bi->pages_in_use - bi->soft_del_pages;
- } else {
- dev->gc_not_done = 0;
- }
- }
-
- if (selected) {
- yaffs_trace(YAFFS_TRACE_GC,
- "GC Selected block %d with %d free, prioritised:%d",
- selected,
- dev->param.chunks_per_block - dev->gc_pages_in_use,
- prioritised);
-
- dev->n_gc_blocks++;
- if (background)
- dev->bg_gcs++;
-
- dev->gc_dirtiest = 0;
- dev->gc_pages_in_use = 0;
- dev->gc_not_done = 0;
- if (dev->refresh_skip > 0)
- dev->refresh_skip--;
- } else {
- dev->gc_not_done++;
- yaffs_trace(YAFFS_TRACE_GC,
- "GC none: finder %d skip %d threshold %d dirtiest %d using %d oldest %d%s",
- dev->gc_block_finder, dev->gc_not_done, threshold,
- dev->gc_dirtiest, dev->gc_pages_in_use,
- dev->oldest_dirty_block, background ? " bg" : "");
- }
-
- return selected;
-}
-
-/* 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 only accepts 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_check_gc(struct yaffs_dev *dev, int background)
-{
- int aggressive = 0;
- int gc_ok = YAFFS_OK;
- int max_tries = 0;
- int min_erased;
- int erased_chunks;
- int checkpt_block_adjust;
-
- if (dev->param.gc_control_fn &&
- (dev->param.gc_control_fn(dev) & 1) == 0)
- return YAFFS_OK;
-
- if (dev->gc_disable)
- /* Bail out so we don't get recursive gc */
- return YAFFS_OK;
-
- /* This loop should pass the first time.
- * Only loops here if the collection does not increase space.
- */
-
- do {
- max_tries++;
-
- checkpt_block_adjust = yaffs_calc_checkpt_blocks_required(dev);
-
- min_erased =
- dev->param.n_reserved_blocks + checkpt_block_adjust + 1;
- erased_chunks =
- dev->n_erased_blocks * dev->param.chunks_per_block;
-
- /* If we need a block soon then do aggressive gc. */
- if (dev->n_erased_blocks < min_erased)
- aggressive = 1;
- else {
- if (!background
- && erased_chunks > (dev->n_free_chunks / 4))
- break;
-
- if (dev->gc_skip > 20)
- dev->gc_skip = 20;
- if (erased_chunks < dev->n_free_chunks / 2 ||
- dev->gc_skip < 1 || background)
- aggressive = 0;
- else {
- dev->gc_skip--;
- break;
- }
- }
-
- dev->gc_skip = 5;
-
- /* If we don't already have a block being gc'd then see if we
- * should start another */
-
- if (dev->gc_block < 1 && !aggressive) {
- dev->gc_block = yaffs2_find_refresh_block(dev);
- dev->gc_chunk = 0;
- dev->n_clean_ups = 0;
- }
- if (dev->gc_block < 1) {
- dev->gc_block =
- yaffs_find_gc_block(dev, aggressive, background);
- dev->gc_chunk = 0;
- dev->n_clean_ups = 0;
- }
-
- if (dev->gc_block > 0) {
- dev->all_gcs++;
- if (!aggressive)
- dev->passive_gc_count++;
-
- yaffs_trace(YAFFS_TRACE_GC,
- "yaffs: GC n_erased_blocks %d aggressive %d",
- dev->n_erased_blocks, aggressive);
-
- gc_ok = yaffs_gc_block(dev, dev->gc_block, aggressive);
- }
-
- if (dev->n_erased_blocks < (dev->param.n_reserved_blocks) &&
- dev->gc_block > 0) {
- yaffs_trace(YAFFS_TRACE_GC,
- "yaffs: GC !!!no reclaim!!! n_erased_blocks %d after try %d block %d",
- dev->n_erased_blocks, max_tries,
- dev->gc_block);
- }
- } while ((dev->n_erased_blocks < dev->param.n_reserved_blocks) &&
- (dev->gc_block > 0) && (max_tries < 2));
-
- return aggressive ? gc_ok : YAFFS_OK;
-}
-
-/*
- * yaffs_bg_gc()
- * Garbage collects. Intended to be called from a background thread.
- * Returns non-zero if at least half the free chunks are erased.
- */
-int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency)
-{
- int erased_chunks = dev->n_erased_blocks * dev->param.chunks_per_block;
-
- yaffs_trace(YAFFS_TRACE_BACKGROUND, "Background gc %u", urgency);
-
- yaffs_check_gc(dev, 1);
- return erased_chunks > dev->n_free_chunks / 2;
-}
-
-/*-------------------- Data file manipulation -----------------*/
-
-static int yaffs_rd_data_obj(struct yaffs_obj *in, int inode_chunk, u8 * buffer)
-{
- int nand_chunk = yaffs_find_chunk_in_file(in, inode_chunk, NULL);
-
- if (nand_chunk >= 0)
- return yaffs_rd_chunk_tags_nand(in->my_dev, nand_chunk,
- buffer, NULL);
- else {
- yaffs_trace(YAFFS_TRACE_NANDACCESS,
- "Chunk %d not found zero instead",
- nand_chunk);
- /* get sane (zero) data if you read a hole */
- memset(buffer, 0, in->my_dev->data_bytes_per_chunk);
- return 0;
- }
-
-}
-
-void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
- int lyn)
-{
- int block;
- int page;
- struct yaffs_ext_tags tags;
- struct yaffs_block_info *bi;
-
- if (chunk_id <= 0)
- return;
-
- dev->n_deletions++;
- block = chunk_id / dev->param.chunks_per_block;
- page = chunk_id % dev->param.chunks_per_block;
-
- if (!yaffs_check_chunk_bit(dev, block, page))
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Deleting invalid chunk %d", chunk_id);
-
- bi = yaffs_get_block_info(dev, block);
-
- yaffs2_update_oldest_dirty_seq(dev, block, bi);
-
- yaffs_trace(YAFFS_TRACE_DELETION,
- "line %d delete of chunk %d",
- lyn, chunk_id);
-
- if (!dev->param.is_yaffs2 && mark_flash &&
- bi->block_state != YAFFS_BLOCK_STATE_COLLECTING) {
-
- memset(&tags, 0, sizeof(tags));
- tags.is_deleted = 1;
- yaffs_wr_chunk_tags_nand(dev, chunk_id, NULL, &tags);
- yaffs_handle_chunk_update(dev, chunk_id, &tags);
- } else {
- dev->n_unmarked_deletions++;
- }
-
- /* Pull out of the management area.
- * If the whole block became dirty, this will kick off an erasure.
- */
- if (bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING ||
- bi->block_state == YAFFS_BLOCK_STATE_FULL ||
- bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
- bi->block_state == YAFFS_BLOCK_STATE_COLLECTING) {
- dev->n_free_chunks++;
- yaffs_clear_chunk_bit(dev, block, page);
- bi->pages_in_use--;
-
- if (bi->pages_in_use == 0 &&
- !bi->has_shrink_hdr &&
- bi->block_state != YAFFS_BLOCK_STATE_ALLOCATING &&
- bi->block_state != YAFFS_BLOCK_STATE_NEEDS_SCAN) {
- yaffs_block_became_dirty(dev, block);
- }
- }
-}
-
-static int yaffs_wr_data_obj(struct yaffs_obj *in, int inode_chunk,
- const u8 *buffer, int n_bytes, int use_reserve)
-{
- /* Find old chunk Need to do this to get serial number
- * Write new one and patch into tree.
- * Invalidate old tags.
- */
-
- int prev_chunk_id;
- struct yaffs_ext_tags prev_tags;
- int new_chunk_id;
- struct yaffs_ext_tags new_tags;
- struct yaffs_dev *dev = in->my_dev;
-
- yaffs_check_gc(dev, 0);
-
- /* 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.
- */
- prev_chunk_id = yaffs_find_chunk_in_file(in, inode_chunk, &prev_tags);
- if (prev_chunk_id < 1 &&
- !yaffs_put_chunk_in_file(in, inode_chunk, 0, 0))
- return 0;
-
- /* Set up new tags */
- memset(&new_tags, 0, sizeof(new_tags));
-
- new_tags.chunk_id = inode_chunk;
- new_tags.obj_id = in->obj_id;
- new_tags.serial_number =
- (prev_chunk_id > 0) ? prev_tags.serial_number + 1 : 1;
- new_tags.n_bytes = n_bytes;
-
- if (n_bytes < 1 || n_bytes > dev->param.total_bytes_per_chunk) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "Writing %d bytes to chunk!!!!!!!!!",
- n_bytes);
- BUG();
- }
-
- new_chunk_id =
- yaffs_write_new_chunk(dev, buffer, &new_tags, use_reserve);
-
- if (new_chunk_id > 0) {
- yaffs_put_chunk_in_file(in, inode_chunk, new_chunk_id, 0);
-
- if (prev_chunk_id > 0)
- yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
-
- yaffs_verify_file_sane(in);
- }
- return new_chunk_id;
-
-}
-
-
-
-static int yaffs_do_xattrib_mod(struct yaffs_obj *obj, int set,
- const YCHAR *name, const void *value, int size,
- int flags)
-{
- struct yaffs_xattr_mod xmod;
- int result;
-
- xmod.set = set;
- xmod.name = name;
- xmod.data = value;
- xmod.size = size;
- xmod.flags = flags;
- xmod.result = -ENOSPC;
-
- result = yaffs_update_oh(obj, NULL, 0, 0, 0, &xmod);
-
- if (result > 0)
- return xmod.result;
- else
- return -ENOSPC;
-}
-
-static int yaffs_apply_xattrib_mod(struct yaffs_obj *obj, char *buffer,
- struct yaffs_xattr_mod *xmod)
-{
- int retval = 0;
- int x_offs = sizeof(struct yaffs_obj_hdr);
- struct yaffs_dev *dev = obj->my_dev;
- int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
- 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->has_xattr = nval_hasvalues(x_buffer, x_size);
- obj->xattr_known = 1;
- xmod->result = retval;
-
- return retval;
-}
-
-static int yaffs_do_xattrib_fetch(struct yaffs_obj *obj, const YCHAR *name,
- void *value, int size)
-{
- char *buffer = NULL;
- int result;
- struct yaffs_ext_tags tags;
- struct yaffs_dev *dev = obj->my_dev;
- int x_offs = sizeof(struct yaffs_obj_hdr);
- int x_size = dev->data_bytes_per_chunk - sizeof(struct yaffs_obj_hdr);
- char *x_buffer;
- int retval = 0;
-
- if (obj->hdr_chunk < 1)
- return -ENODATA;
-
- /* If we know that the object has no xattribs then don't do all the
- * reading and parsing.
- */
- if (obj->xattr_known && !obj->has_xattr) {
- if (name)
- return -ENODATA;
- else
- return 0;
- }
-
- buffer = (char *)yaffs_get_temp_buffer(dev);
- if (!buffer)
- return -ENOMEM;
-
- result =
- yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, (u8 *) buffer, &tags);
-
- if (result != YAFFS_OK)
- retval = -ENOENT;
- else {
- x_buffer = buffer + x_offs;
-
- if (!obj->xattr_known) {
- obj->has_xattr = nval_hasvalues(x_buffer, x_size);
- obj->xattr_known = 1;
- }
-
- if (name)
- retval = nval_get(x_buffer, x_size, name, value, size);
- else
- retval = nval_list(x_buffer, x_size, value, size);
- }
- yaffs_release_temp_buffer(dev, (u8 *) buffer);
- return retval;
-}
-
-int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR * name,
- const void *value, int size, int flags)
-{
- return yaffs_do_xattrib_mod(obj, 1, name, value, size, flags);
-}
-
-int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR * name)
-{
- return yaffs_do_xattrib_mod(obj, 0, name, NULL, 0, 0);
-}
-
-int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR * name, void *value,
- int size)
-{
- return yaffs_do_xattrib_fetch(obj, name, value, size);
-}
-
-int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size)
-{
- return yaffs_do_xattrib_fetch(obj, NULL, buffer, size);
-}
-
-static void yaffs_check_obj_details_loaded(struct yaffs_obj *in)
-{
- u8 *buf;
- struct yaffs_obj_hdr *oh;
- struct yaffs_dev *dev;
- struct yaffs_ext_tags tags;
- int result;
- int alloc_failed = 0;
-
- if (!in || !in->lazy_loaded || in->hdr_chunk < 1)
- return;
-
- dev = in->my_dev;
- in->lazy_loaded = 0;
- buf = yaffs_get_temp_buffer(dev);
-
- result = yaffs_rd_chunk_tags_nand(dev, in->hdr_chunk, buf, &tags);
- oh = (struct yaffs_obj_hdr *)buf;
-
- in->yst_mode = oh->yst_mode;
- yaffs_load_attribs(in, oh);
- yaffs_set_obj_name_from_oh(in, oh);
-
- if (in->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
- in->variant.symlink_variant.alias =
- yaffs_clone_str(oh->alias);
- if (!in->variant.symlink_variant.alias)
- alloc_failed = 1; /* Not returned */
- }
- yaffs_release_temp_buffer(dev, buf);
-}
-
-/* UpdateObjectHeader updates the header on NAND for an object.
- * If name is not NULL, then that new name is used.
- */
-int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name, int force,
- int is_shrink, int shadows, struct yaffs_xattr_mod *xmod)
-{
-
- struct yaffs_block_info *bi;
- struct yaffs_dev *dev = in->my_dev;
- int prev_chunk_id;
- int ret_val = 0;
- int result = 0;
- int new_chunk_id;
- struct yaffs_ext_tags new_tags;
- struct yaffs_ext_tags old_tags;
- const YCHAR *alias = NULL;
- u8 *buffer = NULL;
- YCHAR old_name[YAFFS_MAX_NAME_LENGTH + 1];
- struct yaffs_obj_hdr *oh = NULL;
- loff_t file_size = 0;
-
- strcpy(old_name, _Y("silly old name"));
-
- if (in->fake && in != dev->root_dir && !force && !xmod)
- return ret_val;
-
- yaffs_check_gc(dev, 0);
- yaffs_check_obj_details_loaded(in);
-
- buffer = yaffs_get_temp_buffer(in->my_dev);
- oh = (struct yaffs_obj_hdr *)buffer;
-
- prev_chunk_id = in->hdr_chunk;
-
- if (prev_chunk_id > 0) {
- result = yaffs_rd_chunk_tags_nand(dev, prev_chunk_id,
- buffer, &old_tags);
-
- yaffs_verify_oh(in, oh, &old_tags, 0);
- memcpy(old_name, oh->name, sizeof(oh->name));
- memset(buffer, 0xff, sizeof(struct yaffs_obj_hdr));
- } else {
- memset(buffer, 0xff, dev->data_bytes_per_chunk);
- }
-
- oh->type = in->variant_type;
- oh->yst_mode = in->yst_mode;
- oh->shadows_obj = oh->inband_shadowed_obj_id = shadows;
-
- yaffs_load_attribs_oh(oh, in);
-
- if (in->parent)
- oh->parent_obj_id = in->parent->obj_id;
- else
- oh->parent_obj_id = 0;
-
- if (name && *name) {
- memset(oh->name, 0, sizeof(oh->name));
- yaffs_load_oh_from_name(dev, oh->name, name);
- } else if (prev_chunk_id > 0) {
- memcpy(oh->name, old_name, sizeof(oh->name));
- } else {
- memset(oh->name, 0, sizeof(oh->name));
- }
-
- oh->is_shrink = is_shrink;
-
- switch (in->variant_type) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Should not happen */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- if (oh->parent_obj_id != YAFFS_OBJECTID_DELETED &&
- oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED)
- file_size = in->variant.file_variant.file_size;
- yaffs_oh_size_load(oh, file_size);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- oh->equiv_id = in->variant.hardlink_variant.equiv_id;
- 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.symlink_variant.alias;
- if (!alias)
- alias = _Y("no alias");
- strncpy(oh->alias, alias, YAFFS_MAX_ALIAS_LENGTH);
- oh->alias[YAFFS_MAX_ALIAS_LENGTH] = 0;
- break;
- }
-
- /* process any xattrib modifications */
- if (xmod)
- yaffs_apply_xattrib_mod(in, (char *)buffer, xmod);
-
- /* Tags */
- memset(&new_tags, 0, sizeof(new_tags));
- in->serial++;
- new_tags.chunk_id = 0;
- new_tags.obj_id = in->obj_id;
- new_tags.serial_number = in->serial;
-
- /* Add extra info for file header */
- new_tags.extra_available = 1;
- new_tags.extra_parent_id = oh->parent_obj_id;
- new_tags.extra_file_size = file_size;
- new_tags.extra_is_shrink = oh->is_shrink;
- new_tags.extra_equiv_id = oh->equiv_id;
- new_tags.extra_shadows = (oh->shadows_obj > 0) ? 1 : 0;
- new_tags.extra_obj_type = in->variant_type;
- yaffs_verify_oh(in, oh, &new_tags, 1);
-
- /* Create new chunk in NAND */
- new_chunk_id =
- yaffs_write_new_chunk(dev, buffer, &new_tags,
- (prev_chunk_id > 0) ? 1 : 0);
-
- if (buffer)
- yaffs_release_temp_buffer(dev, buffer);
-
- if (new_chunk_id < 0)
- return new_chunk_id;
-
- in->hdr_chunk = new_chunk_id;
-
- if (prev_chunk_id > 0)
- yaffs_chunk_del(dev, prev_chunk_id, 1, __LINE__);
-
- if (!yaffs_obj_cache_dirty(in))
- in->dirty = 0;
-
- /* If this was a shrink, then mark the block
- * that the chunk lives on */
- if (is_shrink) {
- bi = yaffs_get_block_info(in->my_dev,
- new_chunk_id /
- in->my_dev->param.chunks_per_block);
- bi->has_shrink_hdr = 1;
- }
-
-
- return new_chunk_id;
-}
-
-/*--------------------- 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.
- */
-
-int yaffs_file_rd(struct yaffs_obj *in, u8 * buffer, loff_t offset, int n_bytes)
-{
- int chunk;
- u32 start;
- int n_copy;
- int n = n_bytes;
- int n_done = 0;
- struct yaffs_cache *cache;
- struct yaffs_dev *dev;
-
- dev = in->my_dev;
-
- while (n > 0) {
- yaffs_addr_to_chunk(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->data_bytes_per_chunk)
- n_copy = n;
- else
- n_copy = dev->data_bytes_per_chunk - start;
-
- cache = yaffs_find_chunk_cache(in, chunk);
-
- /* 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 || n_copy != dev->data_bytes_per_chunk ||
- dev->param.inband_tags) {
- if (dev->param.n_caches > 0) {
-
- /* If we can't find the data in the cache,
- * then load it up. */
-
- if (!cache) {
- cache =
- yaffs_grab_chunk_cache(in->my_dev);
- cache->object = in;
- cache->chunk_id = chunk;
- cache->dirty = 0;
- cache->locked = 0;
- yaffs_rd_data_obj(in, chunk,
- cache->data);
- cache->n_bytes = 0;
- }
-
- yaffs_use_cache(dev, cache, 0);
-
- cache->locked = 1;
-
- memcpy(buffer, &cache->data[start], n_copy);
-
- cache->locked = 0;
- } else {
- /* Read into the local buffer then copy.. */
-
- u8 *local_buffer =
- yaffs_get_temp_buffer(dev);
- yaffs_rd_data_obj(in, chunk, local_buffer);
-
- memcpy(buffer, &local_buffer[start], n_copy);
-
- yaffs_release_temp_buffer(dev, local_buffer);
- }
- } else {
- /* A full chunk. Read directly into the buffer. */
- yaffs_rd_data_obj(in, chunk, buffer);
- }
- n -= n_copy;
- offset += n_copy;
- buffer += n_copy;
- n_done += n_copy;
- }
- return n_done;
-}
-
-int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
- int n_bytes, int write_through)
-{
-
- int chunk;
- u32 start;
- int n_copy;
- int n = n_bytes;
- int n_done = 0;
- int n_writeback;
- loff_t start_write = offset;
- int chunk_written = 0;
- u32 n_bytes_read;
- loff_t chunk_start;
- struct yaffs_dev *dev;
-
- dev = in->my_dev;
-
- while (n > 0 && chunk_written >= 0) {
- yaffs_addr_to_chunk(dev, offset, &chunk, &start);
-
- if (((loff_t)chunk) *
- dev->data_bytes_per_chunk + start != offset ||
- start >= dev->data_bytes_per_chunk) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "AddrToChunk of offset %lld gives chunk %d start %d",
- offset, chunk, start);
- }
- chunk++; /* File pos to chunk in file offset */
-
- /* OK now check for the curveball where the start and end are in
- * the same chunk.
- */
-
- if ((start + n) < dev->data_bytes_per_chunk) {
- n_copy = n;
-
- /* Now 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.
- */
-
- chunk_start = (((loff_t)(chunk - 1)) *
- dev->data_bytes_per_chunk);
-
- if (chunk_start > in->variant.file_variant.file_size)
- n_bytes_read = 0; /* Past end of file */
- else
- n_bytes_read =
- in->variant.file_variant.file_size -
- chunk_start;
-
- if (n_bytes_read > dev->data_bytes_per_chunk)
- n_bytes_read = dev->data_bytes_per_chunk;
-
- n_writeback =
- (n_bytes_read >
- (start + n)) ? n_bytes_read : (start + n);
-
- if (n_writeback < 0 ||
- n_writeback > dev->data_bytes_per_chunk)
- BUG();
-
- } else {
- n_copy = dev->data_bytes_per_chunk - start;
- n_writeback = dev->data_bytes_per_chunk;
- }
-
- if (n_copy != dev->data_bytes_per_chunk ||
- !dev->param.cache_bypass_aligned ||
- dev->param.inband_tags) {
- /* An incomplete start or end chunk (or maybe both
- * start and end chunk), or we're using inband tags,
- * or we're forcing writes through the cache,
- * so we want to use the cache buffers.
- */
- if (dev->param.n_caches > 0) {
- struct yaffs_cache *cache;
-
- /* If we can't find the data in the cache, then
- * load the cache */
- cache = yaffs_find_chunk_cache(in, chunk);
-
- if (!cache &&
- yaffs_check_alloc_available(dev, 1)) {
- cache = yaffs_grab_chunk_cache(dev);
- cache->object = in;
- cache->chunk_id = chunk;
- cache->dirty = 0;
- cache->locked = 0;
- yaffs_rd_data_obj(in, chunk,
- cache->data);
- } else if (cache &&
- !cache->dirty &&
- !yaffs_check_alloc_available(dev,
- 1)) {
- /* Drop the cache if it was a read cache
- * item and no space check has been made
- * for it.
- */
- cache = NULL;
- }
-
- if (cache) {
- yaffs_use_cache(dev, cache, 1);
- cache->locked = 1;
-
- memcpy(&cache->data[start], buffer,
- n_copy);
-
- cache->locked = 0;
- cache->n_bytes = n_writeback;
-
- if (write_through) {
- chunk_written =
- yaffs_wr_data_obj
- (cache->object,
- cache->chunk_id,
- cache->data,
- cache->n_bytes, 1);
- cache->dirty = 0;
- }
- } else {
- chunk_written = -1; /* fail write */
- }
- } else {
- /* An incomplete start or end chunk (or maybe
- * both start and end chunk). Read into the
- * local buffer then copy over and write back.
- */
-
- u8 *local_buffer = yaffs_get_temp_buffer(dev);
-
- yaffs_rd_data_obj(in, chunk, local_buffer);
- memcpy(&local_buffer[start], buffer, n_copy);
-
- chunk_written =
- yaffs_wr_data_obj(in, chunk,
- local_buffer,
- n_writeback, 0);
-
- yaffs_release_temp_buffer(dev, local_buffer);
- }
- } else {
- /* A full chunk. Write directly from the buffer. */
-
- chunk_written =
- yaffs_wr_data_obj(in, chunk, buffer,
- dev->data_bytes_per_chunk, 0);
-
- /* Since we've overwritten the cached data,
- * we better invalidate it. */
- yaffs_invalidate_chunk_cache(in, chunk);
- }
-
- if (chunk_written >= 0) {
- n -= n_copy;
- offset += n_copy;
- buffer += n_copy;
- n_done += n_copy;
- }
- }
-
- /* Update file object */
-
- if ((start_write + n_done) > in->variant.file_variant.file_size)
- in->variant.file_variant.file_size = (start_write + n_done);
-
- in->dirty = 1;
- return n_done;
-}
-
-int yaffs_wr_file(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
- int n_bytes, int write_through)
-{
- yaffs2_handle_hole(in, offset);
- return yaffs_do_file_wr(in, buffer, offset, n_bytes, write_through);
-}
-
-/* ---------------------- File resizing stuff ------------------ */
-
-static void yaffs_prune_chunks(struct yaffs_obj *in, loff_t new_size)
-{
-
- struct yaffs_dev *dev = in->my_dev;
- loff_t old_size = in->variant.file_variant.file_size;
- int i;
- int chunk_id;
- u32 dummy;
- int last_del;
- int start_del;
-
- if (old_size > 0)
- yaffs_addr_to_chunk(dev, old_size - 1, &last_del, &dummy);
- else
- last_del = 0;
-
- yaffs_addr_to_chunk(dev, new_size + dev->data_bytes_per_chunk - 1,
- &start_del, &dummy);
- last_del++;
- start_del++;
-
- /* Delete backwards so that we don't end up with holes if
- * power is lost part-way through the operation.
- */
- for (i = last_del; i >= start_del; i--) {
- /* NB this could be optimised somewhat,
- * eg. could retrieve the tags and write them without
- * using yaffs_chunk_del
- */
-
- chunk_id = yaffs_find_del_file_chunk(in, i, NULL);
-
- if (chunk_id < 1)
- continue;
-
- if (chunk_id <
- (dev->internal_start_block * dev->param.chunks_per_block) ||
- chunk_id >=
- ((dev->internal_end_block + 1) *
- dev->param.chunks_per_block)) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Found daft chunk_id %d for %d",
- chunk_id, i);
- } else {
- in->n_data_chunks--;
- yaffs_chunk_del(dev, chunk_id, 1, __LINE__);
- }
- }
-}
-
-void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size)
-{
- int new_full;
- u32 new_partial;
- struct yaffs_dev *dev = obj->my_dev;
-
- yaffs_addr_to_chunk(dev, new_size, &new_full, &new_partial);
-
- yaffs_prune_chunks(obj, new_size);
-
- if (new_partial != 0) {
- int last_chunk = 1 + new_full;
- u8 *local_buffer = yaffs_get_temp_buffer(dev);
-
- /* Rewrite the last chunk with its new size and zero pad */
- yaffs_rd_data_obj(obj, last_chunk, local_buffer);
- memset(local_buffer + new_partial, 0,
- dev->data_bytes_per_chunk - new_partial);
-
- yaffs_wr_data_obj(obj, last_chunk, local_buffer,
- new_partial, 1);
-
- yaffs_release_temp_buffer(dev, local_buffer);
- }
-
- obj->variant.file_variant.file_size = new_size;
-
- yaffs_prune_tree(dev, &obj->variant.file_variant);
-}
-
-int yaffs_resize_file(struct yaffs_obj *in, loff_t new_size)
-{
- struct yaffs_dev *dev = in->my_dev;
- loff_t old_size = in->variant.file_variant.file_size;
-
- yaffs_flush_file_cache(in, 1);
- yaffs_invalidate_whole_cache(in);
-
- yaffs_check_gc(dev, 0);
-
- if (in->variant_type != YAFFS_OBJECT_TYPE_FILE)
- return YAFFS_FAIL;
-
- if (new_size == old_size)
- return YAFFS_OK;
-
- if (new_size > old_size) {
- yaffs2_handle_hole(in, new_size);
- in->variant.file_variant.file_size = new_size;
- } else {
- /* new_size < old_size */
- yaffs_resize_file_down(in, new_size);
- }
-
- /* 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->is_shadowed &&
- in->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
- in->parent->obj_id != YAFFS_OBJECTID_DELETED)
- yaffs_update_oh(in, NULL, 0, 0, 0, NULL);
-
- return YAFFS_OK;
-}
-
-int yaffs_flush_file(struct yaffs_obj *in,
- int update_time,
- int data_sync,
- int discard_cache)
-{
- if (!in->dirty)
- return YAFFS_OK;
-
- yaffs_flush_file_cache(in, discard_cache);
-
- if (data_sync)
- return YAFFS_OK;
-
- if (update_time)
- yaffs_load_current_time(in, 0, 0);
-
- return (yaffs_update_oh(in, NULL, 0, 0, 0, NULL) >= 0) ?
- YAFFS_OK : YAFFS_FAIL;
-}
-
-
-/* yaffs_del_file 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_unlink_file_if_needed(struct yaffs_obj *in)
-{
- int ret_val;
- int del_now = 0;
- struct yaffs_dev *dev = in->my_dev;
-
- if (!in->my_inode)
- del_now = 1;
-
- if (del_now) {
- ret_val =
- yaffs_change_obj_name(in, in->my_dev->del_dir,
- _Y("deleted"), 0, 0);
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: immediate deletion of file %d",
- in->obj_id);
- in->deleted = 1;
- in->my_dev->n_deleted_files++;
- if (dev->param.disable_soft_del || dev->param.is_yaffs2)
- yaffs_resize_file(in, 0);
- yaffs_soft_del_file(in);
- } else {
- ret_val =
- yaffs_change_obj_name(in, in->my_dev->unlinked_dir,
- _Y("unlinked"), 0, 0);
- }
- return ret_val;
-}
-
-static int yaffs_del_file(struct yaffs_obj *in)
-{
- int ret_val = YAFFS_OK;
- int deleted; /* Need to cache value on stack if in is freed */
- struct yaffs_dev *dev = in->my_dev;
-
- if (dev->param.disable_soft_del || dev->param.is_yaffs2)
- yaffs_resize_file(in, 0);
-
- if (in->n_data_chunks > 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)
- ret_val = yaffs_unlink_file_if_needed(in);
-
- deleted = in->deleted;
-
- if (ret_val == YAFFS_OK && in->unlinked && !in->deleted) {
- in->deleted = 1;
- deleted = 1;
- in->my_dev->n_deleted_files++;
- yaffs_soft_del_file(in);
- }
- return deleted ? YAFFS_OK : YAFFS_FAIL;
- } else {
- /* The file has no data chunks so we toss it immediately */
- yaffs_free_tnode(in->my_dev, in->variant.file_variant.top);
- in->variant.file_variant.top = NULL;
- yaffs_generic_obj_del(in);
-
- return YAFFS_OK;
- }
-}
-
-int yaffs_is_non_empty_dir(struct yaffs_obj *obj)
-{
- return (obj &&
- obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY) &&
- !(list_empty(&obj->variant.dir_variant.children));
-}
-
-static int yaffs_del_dir(struct yaffs_obj *obj)
-{
- /* First check that the directory is empty. */
- if (yaffs_is_non_empty_dir(obj))
- return YAFFS_FAIL;
-
- return yaffs_generic_obj_del(obj);
-}
-
-static int yaffs_del_symlink(struct yaffs_obj *in)
-{
- kfree(in->variant.symlink_variant.alias);
- in->variant.symlink_variant.alias = NULL;
-
- return yaffs_generic_obj_del(in);
-}
-
-static int yaffs_del_link(struct yaffs_obj *in)
-{
- /* remove this hardlink from the list associated with the equivalent
- * object
- */
- list_del_init(&in->hard_links);
- return yaffs_generic_obj_del(in);
-}
-
-int yaffs_del_obj(struct yaffs_obj *obj)
-{
- int ret_val = -1;
-
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- ret_val = yaffs_del_file(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- if (!list_empty(&obj->variant.dir_variant.dirty)) {
- yaffs_trace(YAFFS_TRACE_BACKGROUND,
- "Remove object %d from dirty directories",
- obj->obj_id);
- list_del_init(&obj->variant.dir_variant.dirty);
- }
- return yaffs_del_dir(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- ret_val = yaffs_del_symlink(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- ret_val = yaffs_del_link(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- ret_val = yaffs_generic_obj_del(obj);
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- ret_val = 0;
- break; /* should not happen. */
- }
- return ret_val;
-}
-
-
-static void yaffs_empty_dir_to_dir(struct yaffs_obj *from_dir,
- struct yaffs_obj *to_dir)
-{
- struct yaffs_obj *obj;
- struct list_head *lh;
- struct list_head *n;
-
- list_for_each_safe(lh, n, &from_dir->variant.dir_variant.children) {
- obj = list_entry(lh, struct yaffs_obj, siblings);
- yaffs_add_obj_to_dir(to_dir, obj);
- }
-}
-
-struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
- enum yaffs_obj_type type)
-{
- /* Tear down the old variant */
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- /* Nuke file data */
- yaffs_resize_file(obj, 0);
- yaffs_free_tnode(obj->my_dev, obj->variant.file_variant.top);
- obj->variant.file_variant.top = NULL;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Put the children in lost and found. */
- yaffs_empty_dir_to_dir(obj, obj->my_dev->lost_n_found);
- if (!list_empty(&obj->variant.dir_variant.dirty))
- list_del_init(&obj->variant.dir_variant.dirty);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- /* Nuke symplink data */
- kfree(obj->variant.symlink_variant.alias);
- obj->variant.symlink_variant.alias = NULL;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- list_del_init(&obj->hard_links);
- break;
- default:
- break;
- }
-
- memset(&obj->variant, 0, sizeof(obj->variant));
-
- /*Set up new variant if the memset is not enough. */
- switch (type) {
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- INIT_LIST_HEAD(&obj->variant.dir_variant.children);
- INIT_LIST_HEAD(&obj->variant.dir_variant.dirty);
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- case YAFFS_OBJECT_TYPE_SYMLINK:
- case YAFFS_OBJECT_TYPE_HARDLINK:
- default:
- break;
- }
-
- obj->variant_type = type;
-
- return obj;
-
-}
-
-static int yaffs_unlink_worker(struct yaffs_obj *obj)
-{
- int del_now = 0;
-
- if (!obj)
- return YAFFS_FAIL;
-
- if (!obj->my_inode)
- del_now = 1;
-
- yaffs_update_parent(obj->parent);
-
- if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
- return yaffs_del_link(obj);
- } else if (!list_empty(&obj->hard_links)) {
- /* 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 works.
- * - Rename the object to the hardlink's name.
- * - Delete the hardlink
- */
-
- struct yaffs_obj *hl;
- struct yaffs_obj *parent;
- int ret_val;
- YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
-
- hl = list_entry(obj->hard_links.next, struct yaffs_obj,
- hard_links);
-
- yaffs_get_obj_name(hl, name, YAFFS_MAX_NAME_LENGTH + 1);
- parent = hl->parent;
-
- list_del_init(&hl->hard_links);
-
- yaffs_add_obj_to_dir(obj->my_dev->unlinked_dir, hl);
-
- ret_val = yaffs_change_obj_name(obj, parent, name, 0, 0);
-
- if (ret_val == YAFFS_OK)
- ret_val = yaffs_generic_obj_del(hl);
-
- return ret_val;
-
- } else if (del_now) {
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- return yaffs_del_file(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- list_del_init(&obj->variant.dir_variant.dirty);
- return yaffs_del_dir(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return yaffs_del_symlink(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- return yaffs_generic_obj_del(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- default:
- return YAFFS_FAIL;
- }
- } else if (yaffs_is_non_empty_dir(obj)) {
- return YAFFS_FAIL;
- } else {
- return yaffs_change_obj_name(obj, obj->my_dev->unlinked_dir,
- _Y("unlinked"), 0, 0);
- }
-}
-
-static int yaffs_unlink_obj(struct yaffs_obj *obj)
-{
- if (obj && obj->unlink_allowed)
- return yaffs_unlink_worker(obj);
-
- return YAFFS_FAIL;
-}
-
-int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR *name)
-{
- struct yaffs_obj *obj;
-
- obj = yaffs_find_by_name(dir, name);
- return yaffs_unlink_obj(obj);
-}
-
-/* Note:
- * If old_name is NULL then we take old_dir as the object to be renamed.
- */
-int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR *old_name,
- struct yaffs_obj *new_dir, const YCHAR *new_name)
-{
- struct yaffs_obj *obj = NULL;
- struct yaffs_obj *existing_target = NULL;
- int force = 0;
- int result;
- struct yaffs_dev *dev;
-
- if (!old_dir || old_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- BUG();
- return YAFFS_FAIL;
- }
- if (!new_dir || new_dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- BUG();
- return YAFFS_FAIL;
- }
-
- dev = old_dir->my_dev;
-
-#ifdef CONFIG_YAFFS_CASE_INSENSITIVE
- /* Special case for case insemsitive systems.
- * While look-up is case insensitive, the name isn't.
- * Therefore we might want to change x.txt to X.txt
- */
- if (old_dir == new_dir &&
- old_name && new_name &&
- strcmp(old_name, new_name) == 0)
- force = 1;
-#endif
-
- if (strnlen(new_name, YAFFS_MAX_NAME_LENGTH + 1) >
- YAFFS_MAX_NAME_LENGTH)
- /* ENAMETOOLONG */
- return YAFFS_FAIL;
-
- if (old_name)
- obj = yaffs_find_by_name(old_dir, old_name);
- else{
- obj = old_dir;
- old_dir = obj->parent;
- }
-
- if (obj && obj->rename_allowed) {
- /* Now handle an existing target, if there is one */
- existing_target = yaffs_find_by_name(new_dir, new_name);
- if (yaffs_is_non_empty_dir(existing_target)) {
- return YAFFS_FAIL; /* ENOTEMPTY */
- } else if (existing_target && existing_target != obj) {
- /* Nuke the target first, using shadowing,
- * but only if it isn't the same object.
- *
- * Note we must disable gc here otherwise it can mess
- * up the shadowing.
- *
- */
- dev->gc_disable = 1;
- yaffs_change_obj_name(obj, new_dir, new_name, force,
- existing_target->obj_id);
- existing_target->is_shadowed = 1;
- yaffs_unlink_obj(existing_target);
- dev->gc_disable = 0;
- }
-
- result = yaffs_change_obj_name(obj, new_dir, new_name, 1, 0);
-
- yaffs_update_parent(old_dir);
- if (new_dir != old_dir)
- yaffs_update_parent(new_dir);
-
- return result;
- }
- return YAFFS_FAIL;
-}
-
-/*----------------------- Initialisation Scanning ---------------------- */
-
-void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
- int backward_scanning)
-{
- struct yaffs_obj *obj;
-
- if (backward_scanning) {
- /* Handle YAFFS2 case (backward scanning)
- * If the shadowed object exists then ignore.
- */
- obj = yaffs_find_by_number(dev, obj_id);
- if (obj)
- return;
- }
-
- /* 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_find_or_create_by_number(dev, obj_id, YAFFS_OBJECT_TYPE_FILE);
- if (!obj)
- return;
- obj->is_shadowed = 1;
- yaffs_add_obj_to_dir(dev->unlinked_dir, obj);
- obj->variant.file_variant.shrink_size = 0;
- obj->valid = 1; /* So that we don't read any other info. */
-}
-
-void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list)
-{
- struct list_head *lh;
- struct list_head *save;
- struct yaffs_obj *hl;
- struct yaffs_obj *in;
-
- list_for_each_safe(lh, save, hard_list) {
- hl = list_entry(lh, struct yaffs_obj, hard_links);
- in = yaffs_find_by_number(dev,
- hl->variant.hardlink_variant.equiv_id);
-
- if (in) {
- /* Add the hardlink pointers */
- hl->variant.hardlink_variant.equiv_obj = in;
- list_add(&hl->hard_links, &in->hard_links);
- } else {
- /* Todo Need to report/handle this better.
- * Got a problem... hardlink to a non-existant object
- */
- hl->variant.hardlink_variant.equiv_obj = NULL;
- INIT_LIST_HEAD(&hl->hard_links);
- }
- }
-}
-
-static void yaffs_strip_deleted_objs(struct yaffs_dev *dev)
-{
- /*
- * Sort out state of unlinked and deleted objects after scanning.
- */
- struct list_head *i;
- struct list_head *n;
- struct yaffs_obj *l;
-
- if (dev->read_only)
- return;
-
- /* Soft delete all the unlinked files */
- list_for_each_safe(i, n,
- &dev->unlinked_dir->variant.dir_variant.children) {
- l = list_entry(i, struct yaffs_obj, siblings);
- yaffs_del_obj(l);
- }
-
- list_for_each_safe(i, n, &dev->del_dir->variant.dir_variant.children) {
- l = list_entry(i, struct yaffs_obj, siblings);
- yaffs_del_obj(l);
- }
-}
-
-/*
- * 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:
- * root_dir->parent == unlinked_dir->parent == del_dir->parent == NULL
- * lost-n-found->parent == root_dir
- *
- * 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_has_null_parent(struct yaffs_dev *dev, struct yaffs_obj *obj)
-{
- return (obj == dev->del_dir ||
- obj == dev->unlinked_dir || obj == dev->root_dir);
-}
-
-static void yaffs_fix_hanging_objs(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj;
- struct yaffs_obj *parent;
- int i;
- struct list_head *lh;
- struct list_head *n;
- int depth_limit;
- int hanging;
-
- if (dev->read_only)
- return;
-
- /* Iterate through the objects in each hash entry,
- * looking at each object.
- * Make sure it is rooted.
- */
-
- for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
- list_for_each_safe(lh, n, &dev->obj_bucket[i].list) {
- obj = list_entry(lh, struct yaffs_obj, hash_link);
- parent = obj->parent;
-
- if (yaffs_has_null_parent(dev, obj)) {
- /* These directories are not hanging */
- hanging = 0;
- } else if (!parent ||
- parent->variant_type !=
- YAFFS_OBJECT_TYPE_DIRECTORY) {
- hanging = 1;
- } else if (yaffs_has_null_parent(dev, parent)) {
- hanging = 0;
- } else {
- /*
- * Need to follow the parent chain to
- * see if it is hanging.
- */
- hanging = 0;
- depth_limit = 100;
-
- while (parent != dev->root_dir &&
- parent->parent &&
- parent->parent->variant_type ==
- YAFFS_OBJECT_TYPE_DIRECTORY &&
- depth_limit > 0) {
- parent = parent->parent;
- depth_limit--;
- }
- if (parent != dev->root_dir)
- hanging = 1;
- }
- if (hanging) {
- yaffs_trace(YAFFS_TRACE_SCAN,
- "Hanging object %d moved to lost and found",
- obj->obj_id);
- yaffs_add_obj_to_dir(dev->lost_n_found, obj);
- }
- }
- }
-}
-
-/*
- * Delete directory contents for cleaning up lost and found.
- */
-static void yaffs_del_dir_contents(struct yaffs_obj *dir)
-{
- struct yaffs_obj *obj;
- struct list_head *lh;
- struct list_head *n;
-
- if (dir->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY)
- BUG();
-
- list_for_each_safe(lh, n, &dir->variant.dir_variant.children) {
- obj = list_entry(lh, struct yaffs_obj, siblings);
- if (obj->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY)
- yaffs_del_dir_contents(obj);
- yaffs_trace(YAFFS_TRACE_SCAN,
- "Deleting lost_found object %d",
- obj->obj_id);
- yaffs_unlink_obj(obj);
- }
-}
-
-static void yaffs_empty_l_n_f(struct yaffs_dev *dev)
-{
- yaffs_del_dir_contents(dev->lost_n_found);
-}
-
-
-struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *directory,
- const YCHAR *name)
-{
- int sum;
- struct list_head *i;
- YCHAR buffer[YAFFS_MAX_NAME_LENGTH + 1];
- struct yaffs_obj *l;
-
- if (!name)
- return NULL;
-
- if (!directory) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: yaffs_find_by_name: null pointer directory"
- );
- BUG();
- return NULL;
- }
- if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "tragedy: yaffs_find_by_name: non-directory"
- );
- BUG();
- }
-
- sum = yaffs_calc_name_sum(name);
-
- list_for_each(i, &directory->variant.dir_variant.children) {
- l = list_entry(i, struct yaffs_obj, siblings);
-
- if (l->parent != directory)
- BUG();
-
- yaffs_check_obj_details_loaded(l);
-
- /* Special case for lost-n-found */
- if (l->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
- if (!strcmp(name, YAFFS_LOSTNFOUND_NAME))
- return l;
- } else if (l->sum == sum || l->hdr_chunk <= 0) {
- /* LostnFound chunk called Objxxx
- * Do a real check
- */
- yaffs_get_obj_name(l, buffer,
- YAFFS_MAX_NAME_LENGTH + 1);
- if (!strncmp(name, buffer, YAFFS_MAX_NAME_LENGTH))
- return l;
- }
- }
- return NULL;
-}
-
-/* GetEquivalentObject dereferences any hard links to get to the
- * actual object.
- */
-
-struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj)
-{
- if (obj && obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK) {
- obj = obj->variant.hardlink_variant.equiv_obj;
- yaffs_check_obj_details_loaded(obj);
- }
- return 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].
-
- */
-static void yaffs_fix_null_name(struct yaffs_obj *obj, YCHAR *name,
- int buffer_size)
-{
- /* Create an object name if we could not find one. */
- if (strnlen(name, YAFFS_MAX_NAME_LENGTH) == 0) {
- YCHAR local_name[20];
- YCHAR num_string[20];
- YCHAR *x = &num_string[19];
- unsigned v = obj->obj_id;
- num_string[19] = 0;
- while (v > 0) {
- x--;
- *x = '0' + (v % 10);
- v /= 10;
- }
- /* make up a name */
- strcpy(local_name, YAFFS_LOSTNFOUND_PREFIX);
- strcat(local_name, x);
- strncpy(name, local_name, buffer_size - 1);
- }
-}
-
-int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR *name, int buffer_size)
-{
- memset(name, 0, buffer_size * sizeof(YCHAR));
- yaffs_check_obj_details_loaded(obj);
- if (obj->obj_id == YAFFS_OBJECTID_LOSTNFOUND) {
- strncpy(name, YAFFS_LOSTNFOUND_NAME, buffer_size - 1);
- } else if (obj->short_name[0]) {
- strcpy(name, obj->short_name);
- } else if (obj->hdr_chunk > 0) {
- int result;
- u8 *buffer = yaffs_get_temp_buffer(obj->my_dev);
-
- struct yaffs_obj_hdr *oh = (struct yaffs_obj_hdr *)buffer;
-
- memset(buffer, 0, obj->my_dev->data_bytes_per_chunk);
-
- if (obj->hdr_chunk > 0) {
- result = yaffs_rd_chunk_tags_nand(obj->my_dev,
- obj->hdr_chunk,
- buffer, NULL);
- }
- yaffs_load_name_from_oh(obj->my_dev, name, oh->name,
- buffer_size);
-
- yaffs_release_temp_buffer(obj->my_dev, buffer);
- }
-
- yaffs_fix_null_name(obj, name, buffer_size);
-
- return strnlen(name, YAFFS_MAX_NAME_LENGTH);
-}
-
-loff_t yaffs_get_obj_length(struct yaffs_obj *obj)
-{
- /* Dereference any hard linking */
- obj = yaffs_get_equivalent_obj(obj);
-
- if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
- return obj->variant.file_variant.file_size;
- if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK) {
- if (!obj->variant.symlink_variant.alias)
- return 0;
- return strnlen(obj->variant.symlink_variant.alias,
- YAFFS_MAX_ALIAS_LENGTH);
- } else {
- /* Only a directory should drop through to here */
- return obj->my_dev->data_bytes_per_chunk;
- }
-}
-
-int yaffs_get_obj_link_count(struct yaffs_obj *obj)
-{
- int count = 0;
- struct list_head *i;
-
- if (!obj->unlinked)
- count++; /* the object itself */
-
- list_for_each(i, &obj->hard_links)
- count++; /* add the hard links; */
-
- return count;
-}
-
-int yaffs_get_obj_inode(struct yaffs_obj *obj)
-{
- obj = yaffs_get_equivalent_obj(obj);
-
- return obj->obj_id;
-}
-
-unsigned yaffs_get_obj_type(struct yaffs_obj *obj)
-{
- obj = yaffs_get_equivalent_obj(obj);
-
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- return DT_REG;
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- return DT_DIR;
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- return DT_LNK;
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- return DT_REG;
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- if (S_ISFIFO(obj->yst_mode))
- return DT_FIFO;
- if (S_ISCHR(obj->yst_mode))
- return DT_CHR;
- if (S_ISBLK(obj->yst_mode))
- return DT_BLK;
- if (S_ISSOCK(obj->yst_mode))
- return DT_SOCK;
- return DT_REG;
- break;
- default:
- return DT_REG;
- break;
- }
-}
-
-YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj)
-{
- obj = yaffs_get_equivalent_obj(obj);
- if (obj->variant_type == YAFFS_OBJECT_TYPE_SYMLINK)
- return yaffs_clone_str(obj->variant.symlink_variant.alias);
- else
- return yaffs_clone_str(_Y(""));
-}
-
-/*--------------------------- Initialisation code -------------------------- */
-
-static int yaffs_check_dev_fns(struct yaffs_dev *dev)
-{
- struct yaffs_driver *drv = &dev->drv;
- struct yaffs_tags_handler *tagger = &dev->tagger;
-
- /* Common functions, gotta have */
- if (!drv->drv_read_chunk_fn ||
- !drv->drv_write_chunk_fn ||
- !drv->drv_erase_fn)
- return 0;
-
- if (dev->param.is_yaffs2 &&
- (!drv->drv_mark_bad_fn || !drv->drv_check_bad_fn))
- return 0;
-
- /* Install the default tags marshalling functions if needed. */
- yaffs_tags_compat_install(dev);
- yaffs_tags_marshall_install(dev);
-
- /* Check we now have the marshalling functions required. */
- if (!tagger->write_chunk_tags_fn ||
- !tagger->read_chunk_tags_fn ||
- !tagger->query_block_fn ||
- !tagger->mark_bad_fn)
- return 0;
-
- return 1;
-}
-
-static int yaffs_create_initial_dir(struct yaffs_dev *dev)
-{
- /* Initialise the unlinked, deleted, root and lost+found directories */
- dev->lost_n_found = dev->root_dir = NULL;
- dev->unlinked_dir = dev->del_dir = NULL;
- dev->unlinked_dir =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_UNLINKED, S_IFDIR);
- dev->del_dir =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_DELETED, S_IFDIR);
- dev->root_dir =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_ROOT,
- YAFFS_ROOT_MODE | S_IFDIR);
- dev->lost_n_found =
- yaffs_create_fake_dir(dev, YAFFS_OBJECTID_LOSTNFOUND,
- YAFFS_LOSTNFOUND_MODE | S_IFDIR);
-
- if (dev->lost_n_found && dev->root_dir && dev->unlinked_dir
- && dev->del_dir) {
- yaffs_add_obj_to_dir(dev->root_dir, dev->lost_n_found);
- return YAFFS_OK;
- }
- return YAFFS_FAIL;
-}
-
-/* Low level init.
- * Typically only used by yaffs_guts_initialise, but also used by the
- * Low level yaffs driver tests.
- */
-
-int yaffs_guts_ll_init(struct yaffs_dev *dev)
-{
-
-
- yaffs_trace(YAFFS_TRACE_TRACING, "yaffs: yaffs_ll_init()");
-
- if (!dev) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Need a device"
- );
- return YAFFS_FAIL;
- }
-
- if (dev->ll_init)
- return YAFFS_OK;
-
- dev->internal_start_block = dev->param.start_block;
- dev->internal_end_block = dev->param.end_block;
- dev->block_offset = 0;
- dev->chunk_offset = 0;
- dev->n_free_chunks = 0;
-
- dev->gc_block = 0;
-
- if (dev->param.start_block == 0) {
- dev->internal_start_block = dev->param.start_block + 1;
- dev->internal_end_block = dev->param.end_block + 1;
- dev->block_offset = 1;
- dev->chunk_offset = dev->param.chunks_per_block;
- }
-
- /* Check geometry parameters. */
-
- if ((!dev->param.inband_tags && dev->param.is_yaffs2 &&
- dev->param.total_bytes_per_chunk < 1024) ||
- (!dev->param.is_yaffs2 &&
- dev->param.total_bytes_per_chunk < 512) ||
- (dev->param.inband_tags && !dev->param.is_yaffs2) ||
- dev->param.chunks_per_block < 2 ||
- dev->param.n_reserved_blocks < 2 ||
- dev->internal_start_block <= 0 ||
- dev->internal_end_block <= 0 ||
- dev->internal_end_block <=
- (dev->internal_start_block + dev->param.n_reserved_blocks + 2)
- ) {
- /* otherwise it is too small */
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "NAND geometry problems: chunk size %d, type is yaffs%s, inband_tags %d ",
- dev->param.total_bytes_per_chunk,
- dev->param.is_yaffs2 ? "2" : "",
- dev->param.inband_tags);
- return YAFFS_FAIL;
- }
-
- /* Sort out space for inband tags, if required */
- if (dev->param.inband_tags)
- dev->data_bytes_per_chunk =
- dev->param.total_bytes_per_chunk -
- sizeof(struct yaffs_packed_tags2_tags_only);
- else
- dev->data_bytes_per_chunk = dev->param.total_bytes_per_chunk;
-
- /* Got the right mix of functions? */
- if (!yaffs_check_dev_fns(dev)) {
- /* Function missing */
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "device function(s) missing or wrong");
-
- return YAFFS_FAIL;
- }
-
- if (yaffs_init_nand(dev) != YAFFS_OK) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "InitialiseNAND failed");
- return YAFFS_FAIL;
- }
-
- return YAFFS_OK;
-}
-
-
-int yaffs_guts_format_dev(struct yaffs_dev *dev)
-{
- int i;
- enum yaffs_block_state state;
- u32 dummy;
-
- if(yaffs_guts_ll_init(dev) != YAFFS_OK)
- return YAFFS_FAIL;
-
- if(dev->is_mounted)
- return YAFFS_FAIL;
-
- for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- yaffs_query_init_block_state(dev, i, &state, &dummy);
- if (state != YAFFS_BLOCK_STATE_DEAD)
- yaffs_erase_block(dev, i);
- }
-
- return YAFFS_OK;
-}
-
-
-int yaffs_guts_initialise(struct yaffs_dev *dev)
-{
- int init_failed = 0;
- unsigned x;
- int bits;
-
- if(yaffs_guts_ll_init(dev) != YAFFS_OK)
- return YAFFS_FAIL;
-
- if (dev->is_mounted) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "device already mounted");
- return YAFFS_FAIL;
- }
-
- dev->is_mounted = 1;
-
- /* OK now calculate a few things for the device */
-
- /*
- * Calculate all the chunk size manipulation numbers:
- */
- x = dev->data_bytes_per_chunk;
- /* We always use dev->chunk_shift and dev->chunk_div */
- dev->chunk_shift = calc_shifts(x);
- x >>= dev->chunk_shift;
- dev->chunk_div = x;
- /* We only use chunk mask if chunk_div is 1 */
- dev->chunk_mask = (1 << dev->chunk_shift) - 1;
-
- /*
- * Calculate chunk_grp_bits.
- * We need to find the next power of 2 > than internal_end_block
- */
-
- x = dev->param.chunks_per_block * (dev->internal_end_block + 1);
-
- bits = calc_shifts_ceiling(x);
-
- /* Set up tnode width if wide tnodes are enabled. */
- if (!dev->param.wide_tnodes_disabled) {
- /* bits must be even so that we end up with 32-bit words */
- if (bits & 1)
- bits++;
- if (bits < 16)
- dev->tnode_width = 16;
- else
- dev->tnode_width = bits;
- } else {
- dev->tnode_width = 16;
- }
-
- dev->tnode_mask = (1 << dev->tnode_width) - 1;
-
- /* Level0 Tnodes are 16 bits or wider (if wide tnodes are enabled),
- * so if the bitwidth of the
- * chunk range we're using is greater than 16 we need
- * to figure out chunk shift and chunk_grp_size
- */
-
- if (bits <= dev->tnode_width)
- dev->chunk_grp_bits = 0;
- else
- dev->chunk_grp_bits = bits - dev->tnode_width;
-
- dev->tnode_size = (dev->tnode_width * YAFFS_NTNODES_LEVEL0) / 8;
- if (dev->tnode_size < sizeof(struct yaffs_tnode))
- dev->tnode_size = sizeof(struct yaffs_tnode);
-
- dev->chunk_grp_size = 1 << dev->chunk_grp_bits;
-
- if (dev->param.chunks_per_block < dev->chunk_grp_size) {
- /* 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".
- */
- yaffs_trace(YAFFS_TRACE_ALWAYS, "chunk group too large");
-
- return YAFFS_FAIL;
- }
-
- /* Finished verifying the device, continue with initialisation */
-
- /* More device initialisation */
- dev->all_gcs = 0;
- dev->passive_gc_count = 0;
- dev->oldest_dirty_gc_count = 0;
- dev->bg_gcs = 0;
- dev->gc_block_finder = 0;
- dev->buffered_block = -1;
- dev->doing_buffered_block_rewrite = 0;
- dev->n_deleted_files = 0;
- dev->n_bg_deletions = 0;
- dev->n_unlinked_files = 0;
- dev->n_ecc_fixed = 0;
- dev->n_ecc_unfixed = 0;
- dev->n_tags_ecc_fixed = 0;
- dev->n_tags_ecc_unfixed = 0;
- dev->n_erase_failures = 0;
- dev->n_erased_blocks = 0;
- dev->gc_disable = 0;
- dev->has_pending_prioritised_gc = 1;
- /* Assume the worst for now, will get fixed on first GC */
- INIT_LIST_HEAD(&dev->dirty_dirs);
- dev->oldest_dirty_seq = 0;
- dev->oldest_dirty_block = 0;
-
- /* Initialise temporary buffers and caches. */
- if (!yaffs_init_tmp_buffers(dev))
- init_failed = 1;
-
- dev->cache = NULL;
- dev->gc_cleanup_list = NULL;
-
- if (!init_failed && dev->param.n_caches > 0) {
- int i;
- void *buf;
- int cache_bytes =
- dev->param.n_caches * sizeof(struct yaffs_cache);
-
- if (dev->param.n_caches > YAFFS_MAX_SHORT_OP_CACHES)
- dev->param.n_caches = YAFFS_MAX_SHORT_OP_CACHES;
-
- dev->cache = kmalloc(cache_bytes, GFP_NOFS);
-
- buf = (u8 *) dev->cache;
-
- if (dev->cache)
- memset(dev->cache, 0, cache_bytes);
-
- for (i = 0; i < dev->param.n_caches && buf; i++) {
- dev->cache[i].object = NULL;
- dev->cache[i].last_use = 0;
- dev->cache[i].dirty = 0;
- dev->cache[i].data = buf =
- kmalloc(dev->param.total_bytes_per_chunk, GFP_NOFS);
- }
- if (!buf)
- init_failed = 1;
-
- dev->cache_last_use = 0;
- }
-
- dev->cache_hits = 0;
-
- if (!init_failed) {
- dev->gc_cleanup_list =
- kmalloc(dev->param.chunks_per_block * sizeof(u32),
- GFP_NOFS);
- if (!dev->gc_cleanup_list)
- init_failed = 1;
- }
-
- if (dev->param.is_yaffs2)
- dev->param.use_header_file_size = 1;
-
- if (!init_failed && !yaffs_init_blocks(dev))
- init_failed = 1;
-
- yaffs_init_tnodes_and_objs(dev);
-
- if (!init_failed && !yaffs_create_initial_dir(dev))
- init_failed = 1;
-
- if (!init_failed && dev->param.is_yaffs2 &&
- !dev->param.disable_summary &&
- !yaffs_summary_init(dev))
- init_failed = 1;
-
- if (!init_failed) {
- /* Now scan the flash. */
- if (dev->param.is_yaffs2) {
- if (yaffs2_checkpt_restore(dev)) {
- yaffs_check_obj_details_loaded(dev->root_dir);
- yaffs_trace(YAFFS_TRACE_CHECKPOINT |
- YAFFS_TRACE_MOUNT,
- "yaffs: restored from checkpoint"
- );
- } else {
-
- /* Clean up the mess caused by an aborted
- * checkpoint load then scan backwards.
- */
- yaffs_deinit_blocks(dev);
-
- yaffs_deinit_tnodes_and_objs(dev);
-
- dev->n_erased_blocks = 0;
- dev->n_free_chunks = 0;
- dev->alloc_block = -1;
- dev->alloc_page = -1;
- dev->n_deleted_files = 0;
- dev->n_unlinked_files = 0;
- dev->n_bg_deletions = 0;
-
- if (!init_failed && !yaffs_init_blocks(dev))
- init_failed = 1;
-
- yaffs_init_tnodes_and_objs(dev);
-
- if (!init_failed
- && !yaffs_create_initial_dir(dev))
- init_failed = 1;
-
- if (!init_failed && !yaffs2_scan_backwards(dev))
- init_failed = 1;
- }
- } else if (!yaffs1_scan(dev)) {
- init_failed = 1;
- }
-
- yaffs_strip_deleted_objs(dev);
- yaffs_fix_hanging_objs(dev);
- if (dev->param.empty_lost_n_found)
- yaffs_empty_l_n_f(dev);
- }
-
- if (init_failed) {
- /* Clean up the mess */
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: yaffs_guts_initialise() aborted.");
-
- yaffs_deinitialise(dev);
- return YAFFS_FAIL;
- }
-
- /* Zero out stats */
- dev->n_page_reads = 0;
- dev->n_page_writes = 0;
- dev->n_erasures = 0;
- dev->n_gc_copies = 0;
- dev->n_retried_writes = 0;
-
- dev->n_retired_blocks = 0;
-
- yaffs_verify_free_chunks(dev);
- yaffs_verify_blocks(dev);
-
- /* Clean up any aborted checkpoint data */
- if (!dev->is_checkpointed && dev->blocks_in_checkpt > 0)
- yaffs2_checkpt_invalidate(dev);
-
- yaffs_trace(YAFFS_TRACE_TRACING,
- "yaffs: yaffs_guts_initialise() done.");
- return YAFFS_OK;
-}
-
-void yaffs_deinitialise(struct yaffs_dev *dev)
-{
- if (dev->is_mounted) {
- int i;
-
- yaffs_deinit_blocks(dev);
- yaffs_deinit_tnodes_and_objs(dev);
- yaffs_summary_deinit(dev);
-
- if (dev->param.n_caches > 0 && dev->cache) {
-
- for (i = 0; i < dev->param.n_caches; i++) {
- kfree(dev->cache[i].data);
- dev->cache[i].data = NULL;
- }
-
- kfree(dev->cache);
- dev->cache = NULL;
- }
-
- kfree(dev->gc_cleanup_list);
-
- for (i = 0; i < YAFFS_N_TEMP_BUFFERS; i++) {
- kfree(dev->temp_buffer[i].buffer);
- dev->temp_buffer[i].buffer = NULL;
- }
-
- kfree(dev->checkpt_buffer);
- dev->checkpt_buffer = NULL;
- kfree(dev->checkpt_block_list);
- dev->checkpt_block_list = NULL;
-
- dev->is_mounted = 0;
-
- yaffs_deinit_nand(dev);
- }
-}
-
-int yaffs_count_free_chunks(struct yaffs_dev *dev)
-{
- int n_free = 0;
- int b;
- struct yaffs_block_info *blk;
-
- blk = dev->block_info;
- for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
- switch (blk->block_state) {
- case YAFFS_BLOCK_STATE_EMPTY:
- case YAFFS_BLOCK_STATE_ALLOCATING:
- case YAFFS_BLOCK_STATE_COLLECTING:
- case YAFFS_BLOCK_STATE_FULL:
- n_free +=
- (dev->param.chunks_per_block - blk->pages_in_use +
- blk->soft_del_pages);
- break;
- default:
- break;
- }
- blk++;
- }
- return n_free;
-}
-
-int yaffs_get_n_free_chunks(struct yaffs_dev *dev)
-{
- /* This is what we report to the outside world */
- int n_free;
- int n_dirty_caches;
- int blocks_for_checkpt;
- int i;
-
- n_free = dev->n_free_chunks;
- n_free += dev->n_deleted_files;
-
- /* Now count and subtract the number of dirty chunks in the cache. */
-
- for (n_dirty_caches = 0, i = 0; i < dev->param.n_caches; i++) {
- if (dev->cache[i].dirty)
- n_dirty_caches++;
- }
-
- n_free -= n_dirty_caches;
-
- n_free -=
- ((dev->param.n_reserved_blocks + 1) * dev->param.chunks_per_block);
-
- /* Now figure checkpoint space and report that... */
- blocks_for_checkpt = yaffs_calc_checkpt_blocks_required(dev);
-
- n_free -= (blocks_for_checkpt * dev->param.chunks_per_block);
-
- if (n_free < 0)
- n_free = 0;
-
- return n_free;
-}
-
-
-
-/*
- * Marshalling functions to get loff_t file sizes into and out of
- * object headers.
- */
-void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize)
-{
- oh->file_size_low = (fsize & 0xFFFFFFFF);
- oh->file_size_high = ((fsize >> 32) & 0xFFFFFFFF);
-}
-
-loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh)
-{
- loff_t retval;
-
- if (sizeof(loff_t) >= 8 && ~(oh->file_size_high))
- retval = (((loff_t) oh->file_size_high) << 32) |
- (((loff_t) oh->file_size_low) & 0xFFFFFFFF);
- else
- retval = (loff_t) oh->file_size_low;
-
- return retval;
-}
-
-
-void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10])
-{
- int i;
- struct yaffs_block_info *bi;
- int s;
-
- for(i = 0; i < 10; i++)
- bs[i] = 0;
-
- for(i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- bi = yaffs_get_block_info(dev, i);
- s = bi->block_state;
- if(s > YAFFS_BLOCK_STATE_DEAD || s < YAFFS_BLOCK_STATE_UNKNOWN)
- bs[0]++;
- else
- bs[s]++;
- }
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_GUTS_H__
-#define __YAFFS_GUTS_H__
-
-#include "yportenv.h"
-
-#define YAFFS_OK 1
-#define YAFFS_FAIL 0
-
-/* Give us a Y=0x59,
- * Give us an A=0x41,
- * Give us an FF=0xff
- * Give us an S=0x53
- * And what have we got...
- */
-#define YAFFS_MAGIC 0x5941ff53
-
-/*
- * Tnodes form a tree with the tnodes in "levels"
- * Levels greater than 0 hold 8 slots which point to other tnodes.
- * Those at level 0 hold 16 slots which point to chunks in NAND.
- *
- * A maximum level of 8 thust supports files of size up to:
- *
- * 2^(3*MAX_LEVEL+4)
- *
- * Thus a max level of 8 supports files with up to 2^^28 chunks which gives
- * a maximum file size of around 512Gbytees with 2k chunks.
- */
-#define YAFFS_NTNODES_LEVEL0 16
-#define YAFFS_TNODES_LEVEL0_BITS 4
-#define YAFFS_TNODES_LEVEL0_MASK 0xf
-
-#define YAFFS_NTNODES_INTERNAL (YAFFS_NTNODES_LEVEL0 / 2)
-#define YAFFS_TNODES_INTERNAL_BITS (YAFFS_TNODES_LEVEL0_BITS - 1)
-#define YAFFS_TNODES_INTERNAL_MASK 0x7
-#define YAFFS_TNODES_MAX_LEVEL 8
-#define YAFFS_TNODES_MAX_BITS (YAFFS_TNODES_LEVEL0_BITS + \
- YAFFS_TNODES_INTERNAL_BITS * \
- YAFFS_TNODES_MAX_LEVEL)
-#define YAFFS_MAX_CHUNK_ID ((1 << YAFFS_TNODES_MAX_BITS) - 1)
-
-#define YAFFS_MAX_FILE_SIZE_32 0x7fffffff
-
-/* Constants for YAFFS1 mode */
-#define YAFFS_BYTES_PER_SPARE 16
-#define YAFFS_BYTES_PER_CHUNK 512
-#define YAFFS_CHUNK_SIZE_SHIFT 9
-#define YAFFS_CHUNKS_PER_BLOCK 32
-#define YAFFS_BYTES_PER_BLOCK (YAFFS_CHUNKS_PER_BLOCK*YAFFS_BYTES_PER_CHUNK)
-
-#define YAFFS_MIN_YAFFS2_CHUNK_SIZE 1024
-#define YAFFS_MIN_YAFFS2_SPARE_SIZE 32
-
-
-
-#define YAFFS_ALLOCATION_NOBJECTS 100
-#define YAFFS_ALLOCATION_NTNODES 100
-#define YAFFS_ALLOCATION_NLINKS 100
-
-#define YAFFS_NOBJECT_BUCKETS 256
-
-#define YAFFS_OBJECT_SPACE 0x40000
-#define YAFFS_MAX_OBJECT_ID (YAFFS_OBJECT_SPACE - 1)
-
-/* Binary data version stamps */
-#define YAFFS_SUMMARY_VERSION 1
-#define YAFFS_CHECKPOINT_VERSION 7
-
-#ifdef CONFIG_YAFFS_UNICODE
-#define YAFFS_MAX_NAME_LENGTH 127
-#define YAFFS_MAX_ALIAS_LENGTH 79
-#else
-#define YAFFS_MAX_NAME_LENGTH 255
-#define YAFFS_MAX_ALIAS_LENGTH 159
-#endif
-
-#define YAFFS_SHORT_NAME_LENGTH 15
-
-/* Some special object ids for pseudo objects */
-#define YAFFS_OBJECTID_ROOT 1
-#define YAFFS_OBJECTID_LOSTNFOUND 2
-#define YAFFS_OBJECTID_UNLINKED 3
-#define YAFFS_OBJECTID_DELETED 4
-
-/* Fake object Id for summary data */
-#define YAFFS_OBJECTID_SUMMARY 0x10
-
-/* Pseudo object ids for checkpointing */
-#define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
-#define YAFFS_SEQUENCE_CHECKPOINT_DATA 0x21
-
-#define YAFFS_MAX_SHORT_OP_CACHES 20
-
-#define YAFFS_N_TEMP_BUFFERS 6
-
-/* We limit the number attempts at sucessfully saving a chunk of data.
- * Small-page devices have 32 pages per block; large-page devices have 64.
- * Default to something in the order of 5 to 10 blocks worth of chunks.
- */
-#define YAFFS_WR_ATTEMPTS (5*64)
-
-/* Sequence numbers are used in YAFFS2 to determine block allocation order.
- * The range is limited slightly to help distinguish bad numbers from good.
- * This also allows us to perhaps in the future use special numbers for
- * special purposes.
- * EFFFFF00 allows the allocation of 8 blocks/second (~1Mbytes) for 15 years,
- * and is a larger number than the lifetime of a 2GB device.
- */
-#define YAFFS_LOWEST_SEQUENCE_NUMBER 0x00001000
-#define YAFFS_HIGHEST_SEQUENCE_NUMBER 0xefffff00
-
-/* Special sequence number for bad block that failed to be marked bad */
-#define YAFFS_SEQUENCE_BAD_BLOCK 0xffff0000
-
-/* ChunkCache is used for short read/write operations.*/
-struct yaffs_cache {
- struct yaffs_obj *object;
- int chunk_id;
- int last_use;
- int dirty;
- int n_bytes; /* Only valid if the cache is dirty */
- int locked; /* Can't push out or flush while locked. */
- u8 *data;
-};
-
-/* yaffs1 tags structures in RAM
- * NB This uses bitfield. Bitfields should not straddle a u32 boundary
- * otherwise the structure size will get blown out.
- */
-
-struct yaffs_tags {
- u32 chunk_id:20;
- u32 serial_number:2;
- u32 n_bytes_lsb:10;
- u32 obj_id:18;
- u32 ecc:12;
- u32 n_bytes_msb:2;
-};
-
-union yaffs_tags_union {
- struct yaffs_tags as_tags;
- u8 as_bytes[8];
-};
-
-
-/* Stuff used for extended tags in YAFFS2 */
-
-enum yaffs_ecc_result {
- YAFFS_ECC_RESULT_UNKNOWN,
- YAFFS_ECC_RESULT_NO_ERROR,
- YAFFS_ECC_RESULT_FIXED,
- YAFFS_ECC_RESULT_UNFIXED
-};
-
-enum yaffs_obj_type {
- YAFFS_OBJECT_TYPE_UNKNOWN,
- YAFFS_OBJECT_TYPE_FILE,
- YAFFS_OBJECT_TYPE_SYMLINK,
- YAFFS_OBJECT_TYPE_DIRECTORY,
- YAFFS_OBJECT_TYPE_HARDLINK,
- YAFFS_OBJECT_TYPE_SPECIAL
-};
-
-#define YAFFS_OBJECT_TYPE_MAX YAFFS_OBJECT_TYPE_SPECIAL
-
-struct yaffs_ext_tags {
- unsigned chunk_used; /* Status of the chunk: used or unused */
- unsigned obj_id; /* If 0 this is not used */
- unsigned chunk_id; /* If 0 this is a header, else a data chunk */
- unsigned n_bytes; /* Only valid for data chunks */
-
- /* The following stuff only has meaning when we read */
- enum yaffs_ecc_result ecc_result;
- unsigned block_bad;
-
- /* YAFFS 1 stuff */
- unsigned is_deleted; /* The chunk is marked deleted */
- unsigned serial_number; /* Yaffs1 2-bit serial number */
-
- /* YAFFS2 stuff */
- unsigned seq_number; /* The sequence number of this block */
-
- /* Extra info if this is an object header (YAFFS2 only) */
-
- unsigned extra_available; /* Extra info available if not zero */
- unsigned extra_parent_id; /* The parent object */
- unsigned extra_is_shrink; /* Is it a shrink header? */
- unsigned extra_shadows; /* Does this shadow another object? */
-
- enum yaffs_obj_type extra_obj_type; /* What object type? */
-
- loff_t extra_file_size; /* Length if it is a file */
- unsigned extra_equiv_id; /* Equivalent object for a hard link */
-};
-
-/* Spare structure for YAFFS1 */
-struct yaffs_spare {
- u8 tb0;
- u8 tb1;
- u8 tb2;
- u8 tb3;
- u8 page_status; /* set to 0 to delete the chunk */
- u8 block_status;
- u8 tb4;
- u8 tb5;
- u8 ecc1[3];
- u8 tb6;
- u8 tb7;
- u8 ecc2[3];
-};
-
-/*Special structure for passing through to mtd */
-struct yaffs_nand_spare {
- struct yaffs_spare spare;
- int eccres1;
- int eccres2;
-};
-
-/* Block data in RAM */
-
-enum yaffs_block_state {
- YAFFS_BLOCK_STATE_UNKNOWN = 0,
-
- YAFFS_BLOCK_STATE_SCANNING,
- /* Being scanned */
-
- YAFFS_BLOCK_STATE_NEEDS_SCAN,
- /* 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.
- * This state is only valid during scanning.
- * NB We tolerate empty because the pre-scanner might be incapable of
- * deciding
- * However, if this state is returned on a YAFFS2 device,
- * then we expect a sequence number
- */
-
- YAFFS_BLOCK_STATE_EMPTY,
- /* This block is empty */
-
- YAFFS_BLOCK_STATE_ALLOCATING,
- /* 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.
- * 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,
- /* 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. */
-
- YAFFS_BLOCK_STATE_COLLECTING,
- /* This block is being garbage collected */
-
- YAFFS_BLOCK_STATE_DEAD
- /* This block has failed and is not in use */
-};
-
-#define YAFFS_NUMBER_OF_BLOCK_STATES (YAFFS_BLOCK_STATE_DEAD + 1)
-
-struct yaffs_block_info {
-
- s32 soft_del_pages:10; /* number of soft deleted pages */
- s32 pages_in_use:10; /* number of pages in use */
- u32 block_state:4; /* One of the above block states. */
- /* NB use unsigned because enum is sometimes
- * an int */
- u32 needs_retiring:1; /* Data has failed on this block, */
- /*need to get valid data off and retire*/
- u32 skip_erased_check:1;/* Skip the erased check on this block */
- u32 gc_prioritise:1; /* An ECC check or blank check has failed.
- Block should be prioritised for GC */
- u32 chunk_error_strikes:3; /* How many times we've had ecc etc
- failures on this block and tried to reuse it */
- u32 has_summary:1; /* The block has a summary */
-
- u32 has_shrink_hdr:1; /* This block has at least one shrink header */
- u32 seq_number; /* block sequence number for yaffs2 */
-
-};
-
-/* -------------------------- Object structure -------------------------------*/
-/* This is the object structure as stored on NAND */
-
-struct yaffs_obj_hdr {
- enum yaffs_obj_type type;
-
- /* Apply to everything */
- int parent_obj_id;
- u16 sum_no_longer_used; /* checksum of name. No longer used */
- YCHAR name[YAFFS_MAX_NAME_LENGTH + 1];
-
- /* The following apply to all object types except for hard links */
- u32 yst_mode; /* protection */
-
- u32 yst_uid;
- u32 yst_gid;
- u32 yst_atime;
- u32 yst_mtime;
- u32 yst_ctime;
-
- /* File size applies to files only */
- u32 file_size_low;
-
- /* Equivalent object id applies to hard links only. */
- int equiv_id;
-
- /* Alias is for symlinks only. */
- YCHAR alias[YAFFS_MAX_ALIAS_LENGTH + 1];
-
- u32 yst_rdev; /* stuff for block and char devices (major/min) */
-
- u32 win_ctime[2];
- u32 win_atime[2];
- u32 win_mtime[2];
-
- u32 inband_shadowed_obj_id;
- u32 inband_is_shrink;
-
- u32 file_size_high;
- u32 reserved[1];
- int shadows_obj; /* This object header shadows the
- specified object if > 0 */
-
- /* is_shrink applies to object headers written when wemake a hole. */
- u32 is_shrink;
-
-};
-
-/*--------------------------- Tnode -------------------------- */
-
-struct yaffs_tnode {
- struct yaffs_tnode *internal[YAFFS_NTNODES_INTERNAL];
-};
-
-/*------------------------ Object -----------------------------*/
-/* An object can be one of:
- * - a directory (no data, has children links
- * - a regular file (data.... not prunes :->).
- * - a symlink [symbolic link] (the alias).
- * - a hard link
- */
-
-struct yaffs_file_var {
- loff_t file_size;
- loff_t scanned_size;
- loff_t shrink_size;
- int top_level;
- struct yaffs_tnode *top;
-};
-
-struct yaffs_dir_var {
- struct list_head children; /* list of child links */
- struct list_head dirty; /* Entry for list of dirty directories */
-};
-
-struct yaffs_symlink_var {
- YCHAR *alias;
-};
-
-struct yaffs_hardlink_var {
- struct yaffs_obj *equiv_obj;
- u32 equiv_id;
-};
-
-union yaffs_obj_var {
- struct yaffs_file_var file_variant;
- struct yaffs_dir_var dir_variant;
- struct yaffs_symlink_var symlink_variant;
- struct yaffs_hardlink_var hardlink_variant;
-};
-
-struct yaffs_obj {
- u8 deleted:1; /* This should only apply to unlinked files. */
- u8 soft_del:1; /* it has also been soft deleted */
- u8 unlinked:1; /* An unlinked file.*/
- u8 fake:1; /* A fake object has no presence on NAND. */
- u8 rename_allowed:1; /* Some objects cannot be renamed. */
- u8 unlink_allowed:1;
- u8 dirty:1; /* the object needs to be written to flash */
- u8 valid:1; /* When the file system is being loaded up, this
- * object might be created before the data
- * is available
- * ie. file data chunks encountered before
- * the header.
- */
- u8 lazy_loaded:1; /* This object has been lazy loaded and
- * is missing some detail */
-
- u8 defered_free:1; /* Object is removed from NAND, but is
- * still in the inode cache.
- * Free of object is defered.
- * until the inode is released.
- */
- u8 being_created:1; /* This object is still being created
- * so skip some verification checks. */
- u8 is_shadowed:1; /* This object is shadowed on the way
- * to being renamed. */
-
- u8 xattr_known:1; /* We know if this has object has xattribs
- * or not. */
- u8 has_xattr:1; /* This object has xattribs.
- * Only valid if xattr_known. */
-
- u8 serial; /* serial number of chunk in NAND.*/
- u16 sum; /* sum of the name to speed searching */
-
- struct yaffs_dev *my_dev; /* The device I'm on */
-
- struct list_head hash_link; /* list of objects in hash bucket */
-
- struct list_head hard_links; /* hard linked object chain*/
-
- /* directory structure stuff */
- /* also used for linking up the free list */
- struct yaffs_obj *parent;
- struct list_head siblings;
-
- /* Where's my object header in NAND? */
- int hdr_chunk;
-
- int n_data_chunks; /* Number of data chunks for this file. */
-
- u32 obj_id; /* the object id value */
-
- u32 yst_mode;
-
- YCHAR short_name[YAFFS_SHORT_NAME_LENGTH + 1];
-
-#ifdef CONFIG_YAFFS_WINCE
- u32 win_ctime[2];
- u32 win_mtime[2];
- u32 win_atime[2];
-#else
- u32 yst_uid;
- u32 yst_gid;
- u32 yst_atime;
- u32 yst_mtime;
- u32 yst_ctime;
-#endif
-
- u32 yst_rdev;
-
- void *my_inode;
-
- enum yaffs_obj_type variant_type;
-
- union yaffs_obj_var variant;
-
-};
-
-struct yaffs_obj_bucket {
- struct list_head list;
- int count;
-};
-
-/* yaffs_checkpt_obj holds the definition of an object as dumped
- * by checkpointing.
- */
-
-struct yaffs_checkpt_obj {
- int struct_type;
- u32 obj_id;
- u32 parent_id;
- int hdr_chunk;
- enum yaffs_obj_type variant_type:3;
- u8 deleted:1;
- u8 soft_del:1;
- u8 unlinked:1;
- u8 fake:1;
- u8 rename_allowed:1;
- u8 unlink_allowed:1;
- u8 serial;
- int n_data_chunks;
- loff_t size_or_equiv_obj;
-};
-
-/*--------------------- Temporary buffers ----------------
- *
- * These are chunk-sized working buffers. Each device has a few.
- */
-
-struct yaffs_buffer {
- u8 *buffer;
- int in_use;
-};
-
-/*----------------- Device ---------------------------------*/
-
-struct yaffs_param {
- 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 default values are zero.
- */
-
- int inband_tags; /* Use unband tags */
- u32 total_bytes_per_chunk; /* Should be >= 512, does not need to
- be a power of 2 */
- int chunks_per_block; /* does not need to be a power of 2 */
- int spare_bytes_per_chunk; /* spare area size */
- int start_block; /* Start block we're allowed to use */
- int end_block; /* End block we're allowed to use */
- int n_reserved_blocks; /* Tuneable so that we can reduce
- * reserved blocks on NOR and RAM. */
-
- int n_caches; /* If <= 0, then short op caching is disabled,
- * else the number of short op caches.
- */
- int cache_bypass_aligned; /* If non-zero then bypass the cache for
- * aligned writes.
- */
-
- int use_nand_ecc; /* Flag to decide whether or not to use
- * NAND driver ECC on data (yaffs1) */
- int tags_9bytes; /* Use 9 byte tags */
- int no_tags_ecc; /* Flag to decide whether or not to do ECC
- * on packed tags (yaffs2) */
-
- int is_yaffs2; /* Use yaffs2 mode on this device */
-
- int empty_lost_n_found; /* Auto-empty lost+found directory on mount */
-
- int refresh_period; /* How often to check for a block refresh */
-
- /* Checkpoint control. Can be set before or after initialisation */
- u8 skip_checkpt_rd;
- u8 skip_checkpt_wr;
-
- int enable_xattr; /* Enable xattribs */
-
- int max_objects; /*
- * Set to limit the number of objects created.
- * 0 = no limit.
- */
-
- /* The remove_obj_fn function must be supplied by OS flavours that
- * need it.
- * yaffs direct uses it to implement the faster readdir.
- * Linux uses it to protect the directory during unlocking.
- */
- void (*remove_obj_fn) (struct yaffs_obj *obj);
-
- /* Callback to mark the superblock dirty */
- void (*sb_dirty_fn) (struct yaffs_dev *dev);
-
- /* Callback to control garbage collection. */
- unsigned (*gc_control_fn) (struct yaffs_dev *dev);
-
- /* Debug control flags. Don't use unless you know what you're doing */
- int use_header_file_size; /* Flag to determine if we should use
- * file sizes from the header */
- int disable_lazy_load; /* Disable lazy loading on this device */
- int wide_tnodes_disabled; /* Set to disable wide tnodes */
- int disable_soft_del; /* yaffs 1 only: Set to disable the use of
- * softdeletion. */
-
- int defered_dir_update; /* Set to defer directory updates */
-
-#ifdef CONFIG_YAFFS_AUTO_UNICODE
- int auto_unicode;
-#endif
- int always_check_erased; /* Force chunk erased check always on */
-
- int disable_summary;
- int disable_bad_block_marking;
-
-};
-
-struct yaffs_driver {
- int (*drv_write_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
- const u8 *data, int data_len,
- const u8 *oob, int oob_len);
- int (*drv_read_chunk_fn) (struct yaffs_dev *dev, int nand_chunk,
- u8 *data, int data_len,
- u8 *oob, int oob_len,
- enum yaffs_ecc_result *ecc_result);
- int (*drv_erase_fn) (struct yaffs_dev *dev, int block_no);
- int (*drv_mark_bad_fn) (struct yaffs_dev *dev, int block_no);
- int (*drv_check_bad_fn) (struct yaffs_dev *dev, int block_no);
- int (*drv_initialise_fn) (struct yaffs_dev *dev);
- int (*drv_deinitialise_fn) (struct yaffs_dev *dev);
-};
-
-struct yaffs_tags_handler {
- int (*write_chunk_tags_fn) (struct yaffs_dev *dev,
- int nand_chunk, const u8 *data,
- const struct yaffs_ext_tags *tags);
- int (*read_chunk_tags_fn) (struct yaffs_dev *dev,
- int nand_chunk, u8 *data,
- struct yaffs_ext_tags *tags);
-
- int (*query_block_fn) (struct yaffs_dev *dev, int block_no,
- enum yaffs_block_state *state,
- u32 *seq_number);
- int (*mark_bad_fn) (struct yaffs_dev *dev, int block_no);
-};
-
-struct yaffs_dev {
- struct yaffs_param param;
- struct yaffs_driver drv;
- struct yaffs_tags_handler tagger;
-
- /* Context storage. Holds extra OS specific data for this device */
-
- void *os_context;
- void *driver_context;
-
- struct list_head dev_list;
-
- int ll_init;
- /* Runtime parameters. Set up by YAFFS. */
- int data_bytes_per_chunk;
-
- /* Non-wide tnode stuff */
- u16 chunk_grp_bits; /* Number of bits that need to be resolved if
- * the tnodes are not wide enough.
- */
- u16 chunk_grp_size; /* == 2^^chunk_grp_bits */
-
- /* Stuff to support wide tnodes */
- u32 tnode_width;
- u32 tnode_mask;
- u32 tnode_size;
-
- /* Stuff for figuring out file offset to chunk conversions */
- u32 chunk_shift; /* Shift value */
- u32 chunk_div; /* Divisor after shifting: 1 for 2^n sizes */
- u32 chunk_mask; /* Mask to use for power-of-2 case */
-
- int is_mounted;
- int read_only;
- int is_checkpointed;
-
- /* Stuff to support block offsetting to support start block zero */
- int internal_start_block;
- int internal_end_block;
- int block_offset;
- int chunk_offset;
-
- /* Runtime checkpointing stuff */
- int checkpt_page_seq; /* running sequence number of checkpt pages */
- int checkpt_byte_count;
- int checkpt_byte_offs;
- u8 *checkpt_buffer;
- int checkpt_open_write;
- int blocks_in_checkpt;
- int checkpt_cur_chunk;
- int checkpt_cur_block;
- int checkpt_next_block;
- int *checkpt_block_list;
- int checkpt_max_blocks;
- u32 checkpt_sum;
- u32 checkpt_xor;
-
- int checkpoint_blocks_required; /* Number of blocks needed to store
- * current checkpoint set */
-
- /* Block Info */
- struct yaffs_block_info *block_info;
- u8 *chunk_bits; /* bitmap of chunks in use */
- u8 block_info_alt:1; /* allocated using alternative alloc */
- u8 chunk_bits_alt:1; /* allocated using alternative alloc */
- int chunk_bit_stride; /* Number of bytes of chunk_bits per block.
- * Must be consistent with chunks_per_block.
- */
-
- int n_erased_blocks;
- int alloc_block; /* Current block being allocated off */
- u32 alloc_page;
- int alloc_block_finder; /* Used to search for next allocation block */
-
- /* Object and Tnode memory management */
- void *allocator;
- int n_obj;
- int n_tnodes;
-
- int n_hardlinks;
-
- struct yaffs_obj_bucket obj_bucket[YAFFS_NOBJECT_BUCKETS];
- u32 bucket_finder;
-
- int n_free_chunks;
-
- /* Garbage collection control */
- u32 *gc_cleanup_list; /* objects to delete at the end of a GC. */
- u32 n_clean_ups;
-
- unsigned has_pending_prioritised_gc; /* We think this device might
- have pending prioritised gcs */
- unsigned gc_disable;
- unsigned gc_block_finder;
- unsigned gc_dirtiest;
- unsigned gc_pages_in_use;
- unsigned gc_not_done;
- unsigned gc_block;
- unsigned gc_chunk;
- unsigned gc_skip;
- struct yaffs_summary_tags *gc_sum_tags;
-
- /* Special directories */
- struct yaffs_obj *root_dir;
- struct yaffs_obj *lost_n_found;
-
- int buffered_block; /* Which block is buffered here? */
- int doing_buffered_block_rewrite;
-
- struct yaffs_cache *cache;
- int cache_last_use;
-
- /* Stuff for background deletion and unlinked files. */
- struct yaffs_obj *unlinked_dir; /* Directory where unlinked and deleted
- files live. */
- struct yaffs_obj *del_dir; /* Directory where deleted objects are
- sent to disappear. */
- struct yaffs_obj *unlinked_deletion; /* Current file being
- background deleted. */
- int n_deleted_files; /* Count of files awaiting deletion; */
- int n_unlinked_files; /* Count of unlinked files. */
- int n_bg_deletions; /* Count of background deletions. */
-
- /* Temporary buffer management */
- struct yaffs_buffer temp_buffer[YAFFS_N_TEMP_BUFFERS];
- int max_temp;
- int temp_in_use;
- int unmanaged_buffer_allocs;
- int unmanaged_buffer_deallocs;
-
- /* yaffs2 runtime stuff */
- unsigned seq_number; /* Sequence number of currently
- allocating block */
- unsigned oldest_dirty_seq;
- unsigned oldest_dirty_block;
-
- /* Block refreshing */
- int refresh_skip; /* A skip down counter.
- * Refresh happens when this gets to zero. */
-
- /* Dirty directory handling */
- struct list_head dirty_dirs; /* List of dirty directories */
-
- /* Summary */
- int chunks_per_summary;
- struct yaffs_summary_tags *sum_tags;
-
- /* Statistics */
- u32 n_page_writes;
- u32 n_page_reads;
- u32 n_erasures;
- u32 n_bad_queries;
- u32 n_bad_markings;
- u32 n_erase_failures;
- u32 n_gc_copies;
- u32 all_gcs;
- u32 passive_gc_count;
- u32 oldest_dirty_gc_count;
- u32 n_gc_blocks;
- u32 bg_gcs;
- u32 n_retried_writes;
- u32 n_retired_blocks;
- u32 n_ecc_fixed;
- u32 n_ecc_unfixed;
- u32 n_tags_ecc_fixed;
- u32 n_tags_ecc_unfixed;
- u32 n_deletions;
- u32 n_unmarked_deletions;
- u32 refresh_count;
- u32 cache_hits;
- u32 tags_used;
- u32 summary_used;
-
-};
-
-/* The CheckpointDevice structure holds the device information that changes
- *at runtime and must be preserved over unmount/mount cycles.
- */
-struct yaffs_checkpt_dev {
- int struct_type;
- int n_erased_blocks;
- int alloc_block; /* Current block being allocated off */
- u32 alloc_page;
- int n_free_chunks;
-
- int n_deleted_files; /* Count of files awaiting deletion; */
- int n_unlinked_files; /* Count of unlinked files. */
- int n_bg_deletions; /* Count of background deletions. */
-
- /* yaffs2 runtime stuff */
- unsigned seq_number; /* Sequence number of currently
- * allocating block */
-
-};
-
-struct yaffs_checkpt_validity {
- int struct_type;
- u32 magic;
- u32 version;
- u32 head;
-};
-
-struct yaffs_shadow_fixer {
- int obj_id;
- int shadowed_id;
- struct yaffs_shadow_fixer *next;
-};
-
-/* Structure for doing xattr modifications */
-struct yaffs_xattr_mod {
- int set; /* If 0 then this is a deletion */
- const YCHAR *name;
- const void *data;
- int size;
- int flags;
- int result;
-};
-
-/*----------------------- YAFFS Functions -----------------------*/
-
-int yaffs_guts_initialise(struct yaffs_dev *dev);
-void yaffs_deinitialise(struct yaffs_dev *dev);
-
-int yaffs_get_n_free_chunks(struct yaffs_dev *dev);
-
-int yaffs_rename_obj(struct yaffs_obj *old_dir, const YCHAR * old_name,
- struct yaffs_obj *new_dir, const YCHAR * new_name);
-
-int yaffs_unlinker(struct yaffs_obj *dir, const YCHAR * name);
-int yaffs_del_obj(struct yaffs_obj *obj);
-struct yaffs_obj *yaffs_retype_obj(struct yaffs_obj *obj,
- enum yaffs_obj_type type);
-
-
-int yaffs_get_obj_name(struct yaffs_obj *obj, YCHAR * name, int buffer_size);
-loff_t yaffs_get_obj_length(struct yaffs_obj *obj);
-int yaffs_get_obj_inode(struct yaffs_obj *obj);
-unsigned yaffs_get_obj_type(struct yaffs_obj *obj);
-int yaffs_get_obj_link_count(struct yaffs_obj *obj);
-
-/* File operations */
-int yaffs_file_rd(struct yaffs_obj *obj, u8 * buffer, loff_t offset,
- int n_bytes);
-int yaffs_wr_file(struct yaffs_obj *obj, const u8 * buffer, loff_t offset,
- int n_bytes, int write_trhrough);
-int yaffs_resize_file(struct yaffs_obj *obj, loff_t new_size);
-
-struct yaffs_obj *yaffs_create_file(struct yaffs_obj *parent,
- const YCHAR *name, u32 mode, u32 uid,
- u32 gid);
-
-int yaffs_flush_file(struct yaffs_obj *in,
- int update_time,
- int data_sync,
- int discard_cache);
-
-/* Flushing and checkpointing */
-void yaffs_flush_whole_cache(struct yaffs_dev *dev, int discard);
-
-int yaffs_checkpoint_save(struct yaffs_dev *dev);
-int yaffs_checkpoint_restore(struct yaffs_dev *dev);
-
-/* Directory operations */
-struct yaffs_obj *yaffs_create_dir(struct yaffs_obj *parent, const YCHAR *name,
- u32 mode, u32 uid, u32 gid);
-struct yaffs_obj *yaffs_find_by_name(struct yaffs_obj *the_dir,
- const YCHAR *name);
-struct yaffs_obj *yaffs_find_by_number(struct yaffs_dev *dev, u32 number);
-
-/* Link operations */
-struct yaffs_obj *yaffs_link_obj(struct yaffs_obj *parent, const YCHAR *name,
- struct yaffs_obj *equiv_obj);
-
-struct yaffs_obj *yaffs_get_equivalent_obj(struct yaffs_obj *obj);
-
-/* Symlink operations */
-struct yaffs_obj *yaffs_create_symlink(struct yaffs_obj *parent,
- const YCHAR *name, u32 mode, u32 uid,
- u32 gid, const YCHAR *alias);
-YCHAR *yaffs_get_symlink_alias(struct yaffs_obj *obj);
-
-/* Special inodes (fifos, sockets and devices) */
-struct yaffs_obj *yaffs_create_special(struct yaffs_obj *parent,
- const YCHAR *name, u32 mode, u32 uid,
- u32 gid, u32 rdev);
-
-int yaffs_set_xattrib(struct yaffs_obj *obj, const YCHAR *name,
- const void *value, int size, int flags);
-int yaffs_get_xattrib(struct yaffs_obj *obj, const YCHAR *name, void *value,
- int size);
-int yaffs_list_xattrib(struct yaffs_obj *obj, char *buffer, int size);
-int yaffs_remove_xattrib(struct yaffs_obj *obj, const YCHAR *name);
-
-/* Special directories */
-struct yaffs_obj *yaffs_root(struct yaffs_dev *dev);
-struct yaffs_obj *yaffs_lost_n_found(struct yaffs_dev *dev);
-
-void yaffs_handle_defered_free(struct yaffs_obj *obj);
-
-void yaffs_update_dirty_dirs(struct yaffs_dev *dev);
-
-int yaffs_bg_gc(struct yaffs_dev *dev, unsigned urgency);
-
-/* Debug dump */
-int yaffs_dump_obj(struct yaffs_obj *obj);
-
-void yaffs_guts_test(struct yaffs_dev *dev);
-int yaffs_guts_ll_init(struct yaffs_dev *dev);
-
-
-/* A few useful functions to be used within the core files*/
-void yaffs_chunk_del(struct yaffs_dev *dev, int chunk_id, int mark_flash,
- int lyn);
-int yaffs_check_ff(u8 *buffer, int n_bytes);
-void yaffs_handle_chunk_error(struct yaffs_dev *dev,
- struct yaffs_block_info *bi);
-
-u8 *yaffs_get_temp_buffer(struct yaffs_dev *dev);
-void yaffs_release_temp_buffer(struct yaffs_dev *dev, u8 *buffer);
-
-struct yaffs_obj *yaffs_find_or_create_by_number(struct yaffs_dev *dev,
- int number,
- enum yaffs_obj_type type);
-int yaffs_put_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- int nand_chunk, int in_scan);
-void yaffs_set_obj_name(struct yaffs_obj *obj, const YCHAR *name);
-void yaffs_set_obj_name_from_oh(struct yaffs_obj *obj,
- const struct yaffs_obj_hdr *oh);
-void yaffs_add_obj_to_dir(struct yaffs_obj *directory, struct yaffs_obj *obj);
-YCHAR *yaffs_clone_str(const YCHAR *str);
-void yaffs_link_fixup(struct yaffs_dev *dev, struct list_head *hard_list);
-void yaffs_block_became_dirty(struct yaffs_dev *dev, int block_no);
-int yaffs_update_oh(struct yaffs_obj *in, const YCHAR *name,
- int force, int is_shrink, int shadows,
- struct yaffs_xattr_mod *xop);
-void yaffs_handle_shadowed_obj(struct yaffs_dev *dev, int obj_id,
- int backward_scanning);
-int yaffs_check_alloc_available(struct yaffs_dev *dev, int n_chunks);
-struct yaffs_tnode *yaffs_get_tnode(struct yaffs_dev *dev);
-struct yaffs_tnode *yaffs_add_find_tnode_0(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct,
- u32 chunk_id,
- struct yaffs_tnode *passed_tn);
-
-int yaffs_do_file_wr(struct yaffs_obj *in, const u8 *buffer, loff_t offset,
- int n_bytes, int write_trhrough);
-void yaffs_resize_file_down(struct yaffs_obj *obj, loff_t new_size);
-void yaffs_skip_rest_of_block(struct yaffs_dev *dev);
-
-int yaffs_count_free_chunks(struct yaffs_dev *dev);
-
-struct yaffs_tnode *yaffs_find_tnode_0(struct yaffs_dev *dev,
- struct yaffs_file_var *file_struct,
- u32 chunk_id);
-
-u32 yaffs_get_group_base(struct yaffs_dev *dev, struct yaffs_tnode *tn,
- unsigned pos);
-
-int yaffs_is_non_empty_dir(struct yaffs_obj *obj);
-
-int yaffs_guts_format_dev(struct yaffs_dev *dev);
-
-void yaffs_addr_to_chunk(struct yaffs_dev *dev, loff_t addr,
- int *chunk_out, u32 *offset_out);
-/*
- * Marshalling functions to get loff_t file sizes into aand out of
- * object headers.
- */
-void yaffs_oh_size_load(struct yaffs_obj_hdr *oh, loff_t fsize);
-loff_t yaffs_oh_to_size(struct yaffs_obj_hdr *oh);
-loff_t yaffs_max_file_size(struct yaffs_dev *dev);
-
-/*
- * Debug function to count number of blocks in each state
- * NB Needs to be called with correct number of integers
- */
-
-void yaffs_count_blocks_by_state(struct yaffs_dev *dev, int bs[10]);
-
-int yaffs_find_chunk_in_file(struct yaffs_obj *in, int inode_chunk,
- struct yaffs_ext_tags *tags);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 "yportenv.h"
-
-struct yaffs_linux_context {
- struct list_head context_list; /* List of these we have mounted */
- struct yaffs_dev *dev;
- struct super_block *super;
- struct task_struct *bg_thread; /* Background thread for this device */
- int bg_running;
- struct mutex gross_lock; /* Gross locking mutex*/
- u8 *spare_buffer; /* For mtdif2 use. Don't know the buffer size
- * at compile time so we have to allocate it.
- */
- struct list_head search_contexts;
- struct task_struct *readdir_process;
- unsigned mount_id;
- int dirty;
-};
-
-#define yaffs_dev_to_lc(dev) ((struct yaffs_linux_context *)((dev)->os_context))
-#define yaffs_dev_to_mtd(dev) ((struct mtd_info *)((dev)->driver_context))
-
-#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
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 "yportenv.h"
-
-#include "yaffs_mtdif.h"
-
-#include "linux/mtd/mtd.h"
-#include "linux/types.h"
-#include "linux/time.h"
-#include "linux/mtd/nand.h"
-#include "linux/kernel.h"
-#include "linux/version.h"
-#include "linux/types.h"
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 14, 0))
-#include "uapi/linux/major.h"
-#endif
-
-#include "yaffs_trace.h"
-#include "yaffs_guts.h"
-#include "yaffs_linux.h"
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
-#define MTD_OPS_AUTO_OOB MTD_OOB_AUTO
-#endif
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
-#define mtd_erase(m, ei) (m)->erase(m, ei)
-#define mtd_write_oob(m, addr, pops) (m)->write_oob(m, addr, pops)
-#define mtd_read_oob(m, addr, pops) (m)->read_oob(m, addr, pops)
-#define mtd_block_isbad(m, offs) (m)->block_isbad(m, offs)
-#define mtd_block_markbad(m, offs) (m)->block_markbad(m, offs)
-#endif
-
-
-
-int nandmtd_erase_block(struct yaffs_dev *dev, int block_no)
-{
- struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
- u32 addr =
- ((loff_t) block_no) * dev->param.total_bytes_per_chunk *
- dev->param.chunks_per_block;
- struct erase_info ei;
- int retval = 0;
-
- ei.mtd = mtd;
- ei.addr = addr;
- ei.len = dev->param.total_bytes_per_chunk * dev->param.chunks_per_block;
- ei.time = 1000;
- ei.retries = 2;
- ei.callback = NULL;
- ei.priv = (u_long) dev;
-
- retval = mtd_erase(mtd, &ei);
-
- if (retval == 0)
- return YAFFS_OK;
-
- return YAFFS_FAIL;
-}
-
-
-static int yaffs_mtd_write(struct yaffs_dev *dev, int nand_chunk,
- const u8 *data, int data_len,
- const u8 *oob, int oob_len)
-{
- struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
- loff_t addr;
- struct mtd_oob_ops ops;
- int retval;
-
- yaffs_trace(YAFFS_TRACE_MTD,
- "yaffs_mtd_write(%p, %d, %p, %d, %p, %d)\n",
- dev, nand_chunk, data, data_len, oob, oob_len);
-
- if (!data || !data_len) {
- data = NULL;
- data_len = 0;
- }
-
- if (!oob || !oob_len) {
- oob = NULL;
- oob_len = 0;
- }
-
- addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
- memset(&ops, 0, sizeof(ops));
- ops.mode = MTD_OPS_AUTO_OOB;
- ops.len = (data) ? data_len : 0;
- ops.ooblen = oob_len;
- ops.datbuf = (u8 *)data;
- ops.oobbuf = (u8 *)oob;
-
- retval = mtd_write_oob(mtd, addr, &ops);
- if (retval) {
- yaffs_trace(YAFFS_TRACE_MTD,
- "write_oob failed, chunk %d, mtd error %d",
- nand_chunk, retval);
- }
- return retval ? YAFFS_FAIL : YAFFS_OK;
-}
-
-static int yaffs_mtd_read(struct yaffs_dev *dev, int nand_chunk,
- u8 *data, int data_len,
- u8 *oob, int oob_len,
- enum yaffs_ecc_result *ecc_result)
-{
- struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
- loff_t addr;
- struct mtd_oob_ops ops;
- int retval;
-
- addr = ((loff_t) nand_chunk) * dev->param.total_bytes_per_chunk;
- memset(&ops, 0, sizeof(ops));
- ops.mode = MTD_OPS_AUTO_OOB;
- ops.len = (data) ? data_len : 0;
- ops.ooblen = oob_len;
- ops.datbuf = data;
- ops.oobbuf = oob;
-
-#if (MTD_VERSION_CODE < MTD_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",
- nand_chunk, retval);
-
- switch (retval) {
- case 0:
- /* no error */
- if(ecc_result)
- *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
- break;
-
- case -EUCLEAN:
- /* MTD's ECC fixed the data */
- if(ecc_result)
- *ecc_result = YAFFS_ECC_RESULT_FIXED;
- dev->n_ecc_fixed++;
- break;
-
- case -EBADMSG:
- default:
- /* MTD's ECC could not fix the data */
- dev->n_ecc_unfixed++;
- if(ecc_result)
- *ecc_result = YAFFS_ECC_RESULT_UNFIXED;
- return YAFFS_FAIL;
- }
-
- return YAFFS_OK;
-}
-
-static int yaffs_mtd_erase(struct yaffs_dev *dev, int block_no)
-{
- struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-
- loff_t addr;
- struct erase_info ei;
- int retval = 0;
- u32 block_size;
-
- block_size = dev->param.total_bytes_per_chunk *
- dev->param.chunks_per_block;
- addr = ((loff_t) block_no) * block_size;
-
- ei.mtd = mtd;
- ei.addr = addr;
- ei.len = block_size;
- ei.time = 1000;
- ei.retries = 2;
- ei.callback = NULL;
- ei.priv = (u_long) dev;
-
- retval = mtd_erase(mtd, &ei);
-
- if (retval == 0)
- return YAFFS_OK;
-
- return YAFFS_FAIL;
-}
-
-static int yaffs_mtd_mark_bad(struct yaffs_dev *dev, int block_no)
-{
- struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
- int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
- int retval;
-
- yaffs_trace(YAFFS_TRACE_BAD_BLOCKS, "marking block %d bad", block_no);
-
- retval = mtd_block_markbad(mtd, (loff_t) blocksize * block_no);
- return (retval) ? YAFFS_FAIL : YAFFS_OK;
-}
-
-static int yaffs_mtd_check_bad(struct yaffs_dev *dev, int block_no)
-{
- struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
- int blocksize = dev->param.chunks_per_block * dev->param.total_bytes_per_chunk;
- int retval;
-
- yaffs_trace(YAFFS_TRACE_MTD, "checking block %d bad", block_no);
-
- retval = mtd_block_isbad(mtd, (loff_t) blocksize * block_no);
- return (retval) ? YAFFS_FAIL : YAFFS_OK;
-}
-
-static int yaffs_mtd_initialise(struct yaffs_dev *dev)
-{
- return YAFFS_OK;
-}
-
-static int yaffs_mtd_deinitialise(struct yaffs_dev *dev)
-{
- return YAFFS_OK;
-}
-
-
-void yaffs_mtd_drv_install(struct yaffs_dev *dev)
-{
- struct yaffs_driver *drv = &dev->drv;
-
- drv->drv_write_chunk_fn = yaffs_mtd_write;
- drv->drv_read_chunk_fn = yaffs_mtd_read;
- drv->drv_erase_fn = yaffs_mtd_erase;
- drv->drv_mark_bad_fn = yaffs_mtd_mark_bad;
- drv->drv_check_bad_fn = yaffs_mtd_check_bad;
- drv->drv_initialise_fn = yaffs_mtd_initialise;
- drv->drv_deinitialise_fn = yaffs_mtd_deinitialise;
-}
-
-
-struct mtd_info * yaffs_get_mtd_device(dev_t sdev)
-{
- struct mtd_info *mtd;
-
- mtd = yaffs_get_mtd_device(sdev);
-
- /* Check it's an mtd device..... */
- if (MAJOR(sdev) != MTD_BLOCK_MAJOR)
- return NULL; /* This isn't an mtd device */
-
- /* Check it's NAND */
- if (mtd->type != MTD_NANDFLASH && mtd->type != MTD_MLCNANDFLASH) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: MTD device is not NAND it's type %d",
- mtd->type);
- return NULL;
- }
-
- yaffs_trace(YAFFS_TRACE_OS, " %s %d", WRITE_SIZE_STR, WRITE_SIZE(mtd));
- yaffs_trace(YAFFS_TRACE_OS, " oobsize %d", mtd->oobsize);
- yaffs_trace(YAFFS_TRACE_OS, " erasesize %d", mtd->erasesize);
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
- yaffs_trace(YAFFS_TRACE_OS, " size %u", mtd->size);
-#else
- yaffs_trace(YAFFS_TRACE_OS, " size %lld", mtd->size);
-#endif
-
- return mtd;
-}
-
-int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
-{
- if (yaffs_version == 2) {
- if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
- mtd->oobsize < YAFFS_MIN_YAFFS2_SPARE_SIZE) &&
- !inband_tags) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "MTD device does not have the right page sizes"
- );
- return -1;
- }
- } else {
- if (WRITE_SIZE(mtd) < YAFFS_BYTES_PER_CHUNK ||
- mtd->oobsize != YAFFS_BYTES_PER_SPARE) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "MTD device does not support have the right page sizes"
- );
- return -1;
- }
- }
-
- return 0;
-}
-
-
-void yaffs_put_mtd_device(struct mtd_info *mtd)
-{
- if(mtd)
- put_mtd_device(mtd);
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_MTDIF_H__
-#define __YAFFS_MTDIF_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_mtd_drv_install(struct yaffs_dev *dev);
-struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
-void yaffs_put_mtd_device(struct mtd_info *mtd);
-int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 (!strncmp((YCHAR *) (xb + pos + sizeof(int)),
- name, size)) {
- 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 -ENODATA;
-}
-
-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)
- return -ENODATA;
-
- /* 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;
-}
-
-int nval_set(char *xb, int xb_size, const YCHAR *name, const char *buf,
- int bsize, int flags)
-{
- int pos;
- int namelen = 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);
- 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 bsize is zero then this is a size query.
- * Return the size, but don't copy.
- */
- if (!bsize)
- return size;
-
- if (size <= bsize) {
- memcpy(buf, xb + pos, size);
- return size;
- }
- }
- if (pos >= 0)
- return -ERANGE;
-
- 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 = 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
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_nand.h"
-#include "yaffs_tagscompat.h"
-
-#include "yaffs_getblockinfo.h"
-#include "yaffs_summary.h"
-
-static int apply_chunk_offset(struct yaffs_dev *dev, int chunk)
-{
- return chunk - dev->chunk_offset;
-}
-
-int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
- u8 *buffer, struct yaffs_ext_tags *tags)
-{
- int result;
- struct yaffs_ext_tags local_tags;
- int flash_chunk = apply_chunk_offset(dev, nand_chunk);
-
- dev->n_page_reads++;
-
- /* If there are no tags provided use local tags. */
- if (!tags)
- tags = &local_tags;
-
- result = dev->tagger.read_chunk_tags_fn(dev, flash_chunk, buffer, tags);
- if (tags && tags->ecc_result > YAFFS_ECC_RESULT_NO_ERROR) {
-
- struct yaffs_block_info *bi;
- bi = yaffs_get_block_info(dev,
- nand_chunk /
- dev->param.chunks_per_block);
- yaffs_handle_chunk_error(dev, bi);
- }
- return result;
-}
-
-int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
- int nand_chunk,
- const u8 *buffer, struct yaffs_ext_tags *tags)
-{
- int result;
- int flash_chunk = apply_chunk_offset(dev, nand_chunk);
-
- dev->n_page_writes++;
-
- if (!tags) {
- yaffs_trace(YAFFS_TRACE_ERROR, "Writing with no tags");
- BUG();
- return YAFFS_FAIL;
- }
-
- tags->seq_number = dev->seq_number;
- tags->chunk_used = 1;
- yaffs_trace(YAFFS_TRACE_WRITE,
- "Writing chunk %d tags %d %d",
- nand_chunk, tags->obj_id, tags->chunk_id);
-
- result = dev->tagger.write_chunk_tags_fn(dev, flash_chunk,
- buffer, tags);
-
- yaffs_summary_add(dev, tags, nand_chunk);
-
- return result;
-}
-
-int yaffs_mark_bad(struct yaffs_dev *dev, int block_no)
-{
- block_no -= dev->block_offset;
- dev->n_bad_markings++;
-
- if (dev->param.disable_bad_block_marking)
- return YAFFS_OK;
-
- return dev->tagger.mark_bad_fn(dev, block_no);
-}
-
-
-int yaffs_query_init_block_state(struct yaffs_dev *dev,
- int block_no,
- enum yaffs_block_state *state,
- u32 *seq_number)
-{
- block_no -= dev->block_offset;
- return dev->tagger.query_block_fn(dev, block_no, state, seq_number);
-}
-
-int yaffs_erase_block(struct yaffs_dev *dev, int block_no)
-{
- int result;
-
- block_no -= dev->block_offset;
- dev->n_erasures++;
- result = dev->drv.drv_erase_fn(dev, block_no);
- return result;
-}
-
-int yaffs_init_nand(struct yaffs_dev *dev)
-{
- if (dev->drv.drv_initialise_fn)
- return dev->drv.drv_initialise_fn(dev);
- return YAFFS_OK;
-}
-
-int yaffs_deinit_nand(struct yaffs_dev *dev)
-{
- if (dev->drv.drv_deinitialise_fn)
- return dev->drv.drv_deinitialise_fn(dev);
- return YAFFS_OK;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_NAND_H__
-#define __YAFFS_NAND_H__
-#include "yaffs_guts.h"
-
-int yaffs_rd_chunk_tags_nand(struct yaffs_dev *dev, int nand_chunk,
- u8 *buffer, struct yaffs_ext_tags *tags);
-
-int yaffs_wr_chunk_tags_nand(struct yaffs_dev *dev,
- int nand_chunk,
- const u8 *buffer, struct yaffs_ext_tags *tags);
-
-int yaffs_mark_bad(struct yaffs_dev *dev, int block_no);
-
-int yaffs_query_init_block_state(struct yaffs_dev *dev,
- int block_no,
- enum yaffs_block_state *state,
- unsigned *seq_number);
-
-int yaffs_erase_block(struct yaffs_dev *dev, int flash_block);
-
-int yaffs_init_nand(struct yaffs_dev *dev);
-int yaffs_deinit_nand(struct yaffs_dev *dev);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_packedtags1.h"
-#include "yportenv.h"
-
-static const u8 all_ff[20] = {
- 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff,
- 0xff, 0xff, 0xff, 0xff
-};
-
-void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
- const struct yaffs_ext_tags *t)
-{
- pt->chunk_id = t->chunk_id;
- pt->serial_number = t->serial_number;
- pt->n_bytes = t->n_bytes;
- pt->obj_id = t->obj_id;
- pt->ecc = 0;
- pt->deleted = (t->is_deleted) ? 0 : 1;
- pt->unused_stuff = 0;
- pt->should_be_ff = 0xffffffff;
-}
-
-void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
- const struct yaffs_packed_tags1 *pt)
-{
-
- if (memcmp(all_ff, pt, sizeof(struct yaffs_packed_tags1))) {
- t->block_bad = 0;
- if (pt->should_be_ff != 0xffffffff)
- t->block_bad = 1;
- t->chunk_used = 1;
- t->obj_id = pt->obj_id;
- t->chunk_id = pt->chunk_id;
- t->n_bytes = pt->n_bytes;
- t->ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
- t->is_deleted = (pt->deleted) ? 0 : 1;
- t->serial_number = pt->serial_number;
- } else {
- memset(t, 0, sizeof(struct yaffs_ext_tags));
- }
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 is used to pack YAFFS1 tags, not YAFFS2 tags. */
-
-#ifndef __YAFFS_PACKEDTAGS1_H__
-#define __YAFFS_PACKEDTAGS1_H__
-
-#include "yaffs_guts.h"
-
-struct yaffs_packed_tags1 {
- u32 chunk_id:20;
- u32 serial_number:2;
- u32 n_bytes:10;
- u32 obj_id:18;
- u32 ecc:12;
- u32 deleted:1;
- u32 unused_stuff:1;
- unsigned should_be_ff;
-
-};
-
-void yaffs_pack_tags1(struct yaffs_packed_tags1 *pt,
- const struct yaffs_ext_tags *t);
-void yaffs_unpack_tags1(struct yaffs_ext_tags *t,
- const struct yaffs_packed_tags1 *pt);
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_packedtags2.h"
-#include "yportenv.h"
-#include "yaffs_trace.h"
-
-/* This code packs a set of extended tags into a binary structure for
- * NAND storage
- */
-
-/* Some of the information is "extra" struff which can be packed in to
- * speed scanning
- * This is defined by having the EXTRA_HEADER_INFO_FLAG set.
- */
-
-/* Extra flags applied to chunk_id */
-
-#define EXTRA_HEADER_INFO_FLAG 0x80000000
-#define EXTRA_SHRINK_FLAG 0x40000000
-#define EXTRA_SHADOWS_FLAG 0x20000000
-#define EXTRA_SPARE_FLAGS 0x10000000
-
-#define ALL_EXTRA_FLAGS 0xf0000000
-
-/* Also, the top 4 bits of the object Id are set to the object type. */
-#define EXTRA_OBJECT_TYPE_SHIFT (28)
-#define EXTRA_OBJECT_TYPE_MASK ((0x0f) << EXTRA_OBJECT_TYPE_SHIFT)
-
-static void yaffs_dump_packed_tags2_tags_only(
- const struct yaffs_packed_tags2_tags_only *ptt)
-{
- yaffs_trace(YAFFS_TRACE_MTD,
- "packed tags obj %d chunk %d byte %d seq %d",
- ptt->obj_id, ptt->chunk_id, ptt->n_bytes, ptt->seq_number);
-}
-
-static void yaffs_dump_packed_tags2(const struct yaffs_packed_tags2 *pt)
-{
- yaffs_dump_packed_tags2_tags_only(&pt->t);
-}
-
-static void yaffs_dump_tags2(const struct yaffs_ext_tags *t)
-{
- yaffs_trace(YAFFS_TRACE_MTD,
- "ext.tags eccres %d blkbad %d chused %d obj %d chunk%d byte %d del %d ser %d seq %d",
- t->ecc_result, t->block_bad, t->chunk_used, t->obj_id,
- t->chunk_id, t->n_bytes, t->is_deleted, t->serial_number,
- t->seq_number);
-
-}
-
-static int yaffs_check_tags_extra_packable(const struct yaffs_ext_tags *t)
-{
- if (t->chunk_id != 0 || !t->extra_available)
- return 0;
-
- /* Check if the file size is too long to store */
- if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE &&
- (t->extra_file_size >> 31) != 0)
- return 0;
- return 1;
-}
-
-void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *ptt,
- const struct yaffs_ext_tags *t)
-{
- ptt->chunk_id = t->chunk_id;
- ptt->seq_number = t->seq_number;
- ptt->n_bytes = t->n_bytes;
- ptt->obj_id = t->obj_id;
-
- /* Only store extra tags for object headers.
- * If it is a file then only store if the file size is short\
- * enough to fit.
- */
- if (yaffs_check_tags_extra_packable(t)) {
- /* Store the extra header info instead */
- /* We save the parent object in the chunk_id */
- ptt->chunk_id = EXTRA_HEADER_INFO_FLAG | t->extra_parent_id;
- if (t->extra_is_shrink)
- ptt->chunk_id |= EXTRA_SHRINK_FLAG;
- if (t->extra_shadows)
- ptt->chunk_id |= EXTRA_SHADOWS_FLAG;
-
- ptt->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
- ptt->obj_id |= (t->extra_obj_type << EXTRA_OBJECT_TYPE_SHIFT);
-
- if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
- ptt->n_bytes = t->extra_equiv_id;
- else if (t->extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
- ptt->n_bytes = (unsigned) t->extra_file_size;
- else
- ptt->n_bytes = 0;
- }
-
- yaffs_dump_packed_tags2_tags_only(ptt);
- yaffs_dump_tags2(t);
-}
-
-void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
- const struct yaffs_ext_tags *t, int tags_ecc)
-{
- yaffs_pack_tags2_tags_only(&pt->t, t);
-
- if (tags_ecc)
- yaffs_ecc_calc_other((unsigned char *)&pt->t,
- sizeof(struct yaffs_packed_tags2_tags_only),
- &pt->ecc);
-}
-
-void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
- struct yaffs_packed_tags2_tags_only *ptt)
-{
- memset(t, 0, sizeof(struct yaffs_ext_tags));
-
- if (ptt->seq_number == 0xffffffff)
- return;
-
- t->block_bad = 0;
- t->chunk_used = 1;
- t->obj_id = ptt->obj_id;
- t->chunk_id = ptt->chunk_id;
- t->n_bytes = ptt->n_bytes;
- t->is_deleted = 0;
- t->serial_number = 0;
- t->seq_number = ptt->seq_number;
-
- /* Do extra header info stuff */
- if (ptt->chunk_id & EXTRA_HEADER_INFO_FLAG) {
- t->chunk_id = 0;
- t->n_bytes = 0;
-
- t->extra_available = 1;
- t->extra_parent_id = ptt->chunk_id & (~(ALL_EXTRA_FLAGS));
- t->extra_is_shrink = ptt->chunk_id & EXTRA_SHRINK_FLAG ? 1 : 0;
- t->extra_shadows = ptt->chunk_id & EXTRA_SHADOWS_FLAG ? 1 : 0;
- t->extra_obj_type = ptt->obj_id >> EXTRA_OBJECT_TYPE_SHIFT;
- t->obj_id &= ~EXTRA_OBJECT_TYPE_MASK;
-
- if (t->extra_obj_type == YAFFS_OBJECT_TYPE_HARDLINK)
- t->extra_equiv_id = ptt->n_bytes;
- else
- t->extra_file_size = ptt->n_bytes;
- }
- yaffs_dump_packed_tags2_tags_only(ptt);
- yaffs_dump_tags2(t);
-}
-
-void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
- int tags_ecc)
-{
- enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-
- if (pt->t.seq_number != 0xffffffff && tags_ecc) {
- /* Chunk is in use and we need to do ECC */
-
- struct yaffs_ecc_other ecc;
- int result;
- yaffs_ecc_calc_other((unsigned char *)&pt->t,
- sizeof(struct yaffs_packed_tags2_tags_only),
- &ecc);
- result =
- yaffs_ecc_correct_other((unsigned char *)&pt->t,
- sizeof(struct yaffs_packed_tags2_tags_only),
- &pt->ecc, &ecc);
- switch (result) {
- case 0:
- ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
- break;
- case 1:
- ecc_result = YAFFS_ECC_RESULT_FIXED;
- break;
- case -1:
- ecc_result = YAFFS_ECC_RESULT_UNFIXED;
- break;
- default:
- ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
- }
- }
- yaffs_unpack_tags2_tags_only(t, &pt->t);
-
- t->ecc_result = ecc_result;
-
- yaffs_dump_packed_tags2(pt);
- yaffs_dump_tags2(t);
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 is used to pack YAFFS2 tags, not YAFFS1tags. */
-
-#ifndef __YAFFS_PACKEDTAGS2_H__
-#define __YAFFS_PACKEDTAGS2_H__
-
-#include "yaffs_guts.h"
-#include "yaffs_ecc.h"
-
-struct yaffs_packed_tags2_tags_only {
- unsigned seq_number;
- unsigned obj_id;
- unsigned chunk_id;
- unsigned n_bytes;
-};
-
-struct yaffs_packed_tags2 {
- struct yaffs_packed_tags2_tags_only t;
- struct yaffs_ecc_other ecc;
-};
-
-/* Full packed tags with ECC, used for oob tags */
-void yaffs_pack_tags2(struct yaffs_packed_tags2 *pt,
- const struct yaffs_ext_tags *t, int tags_ecc);
-void yaffs_unpack_tags2(struct yaffs_ext_tags *t, struct yaffs_packed_tags2 *pt,
- int tags_ecc);
-
-/* Only the tags part (no ECC for use with inband tags */
-void yaffs_pack_tags2_tags_only(struct yaffs_packed_tags2_tags_only *pt,
- const struct yaffs_ext_tags *t);
-void yaffs_unpack_tags2_tags_only(struct yaffs_ext_tags *t,
- struct yaffs_packed_tags2_tags_only *pt);
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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.
- */
-
-/* Summaries write the useful part of the tags for the chunks in a block into an
- * an array which is written to the last n chunks of the block.
- * Reading the summaries gives all the tags for the block in one read. Much
- * faster.
- *
- * Chunks holding summaries are marked with tags making it look like
- * they are part of a fake file.
- *
- * The summary could also be used during gc.
- *
- */
-
-#include "yaffs_summary.h"
-#include "yaffs_packedtags2.h"
-#include "yaffs_nand.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_bitmap.h"
-
-/*
- * The summary is built up in an array of summary tags.
- * This gets written to the last one or two (maybe more) chunks in a block.
- * A summary header is written as the first part of each chunk of summary data.
- * The summary header must match or the summary is rejected.
- */
-
-/* Summary tags don't need the sequence number because that is redundant. */
-struct yaffs_summary_tags {
- unsigned obj_id;
- unsigned chunk_id;
- unsigned n_bytes;
-};
-
-/* Summary header */
-struct yaffs_summary_header {
- unsigned version; /* Must match current version */
- unsigned block; /* Must be this block */
- unsigned seq; /* Must be this sequence number */
- unsigned sum; /* Just add up all the bytes in the tags */
-};
-
-
-static void yaffs_summary_clear(struct yaffs_dev *dev)
-{
- if (!dev->sum_tags)
- return;
- memset(dev->sum_tags, 0, dev->chunks_per_summary *
- sizeof(struct yaffs_summary_tags));
-}
-
-
-void yaffs_summary_deinit(struct yaffs_dev *dev)
-{
- kfree(dev->sum_tags);
- dev->sum_tags = NULL;
- kfree(dev->gc_sum_tags);
- dev->gc_sum_tags = NULL;
- dev->chunks_per_summary = 0;
-}
-
-int yaffs_summary_init(struct yaffs_dev *dev)
-{
- int sum_bytes;
- int chunks_used; /* Number of chunks used by summary */
- int sum_tags_bytes;
-
- sum_bytes = dev->param.chunks_per_block *
- sizeof(struct yaffs_summary_tags);
-
- chunks_used = (sum_bytes + dev->data_bytes_per_chunk - 1)/
- (dev->data_bytes_per_chunk -
- sizeof(struct yaffs_summary_header));
-
- dev->chunks_per_summary = dev->param.chunks_per_block - chunks_used;
- sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
- dev->chunks_per_summary;
- dev->sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
- dev->gc_sum_tags = kmalloc(sum_tags_bytes, GFP_NOFS);
- if (!dev->sum_tags || !dev->gc_sum_tags) {
- yaffs_summary_deinit(dev);
- return YAFFS_FAIL;
- }
-
- yaffs_summary_clear(dev);
-
- return YAFFS_OK;
-}
-
-static unsigned yaffs_summary_sum(struct yaffs_dev *dev)
-{
- u8 *sum_buffer = (u8 *)dev->sum_tags;
- int i;
- unsigned sum = 0;
-
- i = sizeof(struct yaffs_summary_tags) *
- dev->chunks_per_summary;
- while (i > 0) {
- sum += *sum_buffer;
- sum_buffer++;
- i--;
- }
-
- return sum;
-}
-
-static int yaffs_summary_write(struct yaffs_dev *dev, int blk)
-{
- struct yaffs_ext_tags tags;
- u8 *buffer;
- u8 *sum_buffer = (u8 *)dev->sum_tags;
- int n_bytes;
- int chunk_in_nand;
- int chunk_in_block;
- int result;
- int this_tx;
- struct yaffs_summary_header hdr;
- int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
-
- buffer = yaffs_get_temp_buffer(dev);
- n_bytes = sizeof(struct yaffs_summary_tags) *
- dev->chunks_per_summary;
- memset(&tags, 0, sizeof(struct yaffs_ext_tags));
- tags.obj_id = YAFFS_OBJECTID_SUMMARY;
- tags.chunk_id = 1;
- chunk_in_block = dev->chunks_per_summary;
- chunk_in_nand = dev->alloc_block * dev->param.chunks_per_block +
- dev->chunks_per_summary;
- hdr.version = YAFFS_SUMMARY_VERSION;
- hdr.block = blk;
- hdr.seq = bi->seq_number;
- hdr.sum = yaffs_summary_sum(dev);
-
- do {
- this_tx = n_bytes;
- if (this_tx > sum_bytes_per_chunk)
- this_tx = sum_bytes_per_chunk;
- memcpy(buffer, &hdr, sizeof(hdr));
- memcpy(buffer + sizeof(hdr), sum_buffer, this_tx);
- tags.n_bytes = this_tx + sizeof(hdr);
- result = yaffs_wr_chunk_tags_nand(dev, chunk_in_nand,
- buffer, &tags);
-
- if (result != YAFFS_OK)
- break;
- yaffs_set_chunk_bit(dev, blk, chunk_in_block);
- bi->pages_in_use++;
- dev->n_free_chunks--;
-
- n_bytes -= this_tx;
- sum_buffer += this_tx;
- chunk_in_nand++;
- chunk_in_block++;
- tags.chunk_id++;
- } while (result == YAFFS_OK && n_bytes > 0);
- yaffs_release_temp_buffer(dev, buffer);
-
-
- if (result == YAFFS_OK)
- bi->has_summary = 1;
-
-
- return result;
-}
-
-int yaffs_summary_read(struct yaffs_dev *dev,
- struct yaffs_summary_tags *st,
- int blk)
-{
- struct yaffs_ext_tags tags;
- u8 *buffer;
- u8 *sum_buffer = (u8 *)st;
- int n_bytes;
- int chunk_id;
- int chunk_in_nand;
- int chunk_in_block;
- int result;
- int this_tx;
- struct yaffs_summary_header hdr;
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
- int sum_bytes_per_chunk = dev->data_bytes_per_chunk - sizeof(hdr);
- int sum_tags_bytes;
-
- sum_tags_bytes = sizeof(struct yaffs_summary_tags) *
- dev->chunks_per_summary;
- buffer = yaffs_get_temp_buffer(dev);
- n_bytes = sizeof(struct yaffs_summary_tags) * dev->chunks_per_summary;
- chunk_in_block = dev->chunks_per_summary;
- chunk_in_nand = blk * dev->param.chunks_per_block +
- dev->chunks_per_summary;
- chunk_id = 1;
- do {
- this_tx = n_bytes;
- if (this_tx > sum_bytes_per_chunk)
- this_tx = sum_bytes_per_chunk;
- result = yaffs_rd_chunk_tags_nand(dev, chunk_in_nand,
- buffer, &tags);
-
- if (tags.chunk_id != chunk_id ||
- tags.obj_id != YAFFS_OBJECTID_SUMMARY ||
- tags.chunk_used == 0 ||
- tags.ecc_result > YAFFS_ECC_RESULT_FIXED ||
- tags.n_bytes != (this_tx + sizeof(hdr)))
- result = YAFFS_FAIL;
- if (result != YAFFS_OK)
- break;
-
- if (st == dev->sum_tags) {
- /* If we're scanning then update the block info */
- yaffs_set_chunk_bit(dev, blk, chunk_in_block);
- bi->pages_in_use++;
- }
- memcpy(&hdr, buffer, sizeof(hdr));
- memcpy(sum_buffer, buffer + sizeof(hdr), this_tx);
- n_bytes -= this_tx;
- sum_buffer += this_tx;
- chunk_in_nand++;
- chunk_in_block++;
- chunk_id++;
- } while (result == YAFFS_OK && n_bytes > 0);
- yaffs_release_temp_buffer(dev, buffer);
-
- if (result == YAFFS_OK) {
- /* Verify header */
- if (hdr.version != YAFFS_SUMMARY_VERSION ||
- hdr.seq != bi->seq_number ||
- hdr.sum != yaffs_summary_sum(dev))
- result = YAFFS_FAIL;
- }
-
- if (st == dev->sum_tags && result == YAFFS_OK)
- bi->has_summary = 1;
-
- return result;
-}
-
-int yaffs_summary_add(struct yaffs_dev *dev,
- struct yaffs_ext_tags *tags,
- int chunk_in_nand)
-{
- struct yaffs_packed_tags2_tags_only tags_only;
- struct yaffs_summary_tags *sum_tags;
- int block_in_nand = chunk_in_nand / dev->param.chunks_per_block;
- int chunk_in_block = chunk_in_nand % dev->param.chunks_per_block;
-
- if (!dev->sum_tags)
- return YAFFS_OK;
-
- if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
- yaffs_pack_tags2_tags_only(&tags_only, tags);
- sum_tags = &dev->sum_tags[chunk_in_block];
- sum_tags->chunk_id = tags_only.chunk_id;
- sum_tags->n_bytes = tags_only.n_bytes;
- sum_tags->obj_id = tags_only.obj_id;
-
- if (chunk_in_block == dev->chunks_per_summary - 1) {
- /* Time to write out the summary */
- yaffs_summary_write(dev, block_in_nand);
- yaffs_summary_clear(dev);
- yaffs_skip_rest_of_block(dev);
- }
- }
- return YAFFS_OK;
-}
-
-int yaffs_summary_fetch(struct yaffs_dev *dev,
- struct yaffs_ext_tags *tags,
- int chunk_in_block)
-{
- struct yaffs_packed_tags2_tags_only tags_only;
- struct yaffs_summary_tags *sum_tags;
- if (chunk_in_block >= 0 && chunk_in_block < dev->chunks_per_summary) {
- sum_tags = &dev->sum_tags[chunk_in_block];
- tags_only.chunk_id = sum_tags->chunk_id;
- tags_only.n_bytes = sum_tags->n_bytes;
- tags_only.obj_id = sum_tags->obj_id;
- yaffs_unpack_tags2_tags_only(tags, &tags_only);
- return YAFFS_OK;
- }
- return YAFFS_FAIL;
-}
-
-void yaffs_summary_gc(struct yaffs_dev *dev, int blk)
-{
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, blk);
- int i;
-
- if (!bi->has_summary)
- return;
-
- for (i = dev->chunks_per_summary;
- i < dev->param.chunks_per_block;
- i++) {
- if (yaffs_check_chunk_bit(dev, blk, i)) {
- yaffs_clear_chunk_bit(dev, blk, i);
- bi->pages_in_use--;
- dev->n_free_chunks++;
- }
- }
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_SUMMARY_H__
-#define __YAFFS_SUMMARY_H__
-
-#include "yaffs_packedtags2.h"
-
-
-int yaffs_summary_init(struct yaffs_dev *dev);
-void yaffs_summary_deinit(struct yaffs_dev *dev);
-
-int yaffs_summary_add(struct yaffs_dev *dev,
- struct yaffs_ext_tags *tags,
- int chunk_in_block);
-int yaffs_summary_fetch(struct yaffs_dev *dev,
- struct yaffs_ext_tags *tags,
- int chunk_in_block);
-int yaffs_summary_read(struct yaffs_dev *dev,
- struct yaffs_summary_tags *st,
- int blk);
-void yaffs_summary_gc(struct yaffs_dev *dev, int blk);
-
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_tagscompat.h"
-#include "yaffs_ecc.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_trace.h"
-
-static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
-
-
-/********** Tags ECC calculations *********/
-
-
-void yaffs_calc_tags_ecc(struct yaffs_tags *tags)
-{
- /* Calculate an ecc */
- unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
- unsigned i, j;
- unsigned ecc = 0;
- unsigned bit = 0;
-
- tags->ecc = 0;
-
- for (i = 0; i < 8; i++) {
- for (j = 1; j & 0xff; j <<= 1) {
- bit++;
- if (b[i] & j)
- ecc ^= bit;
- }
- }
- tags->ecc = ecc;
-}
-
-int yaffs_check_tags_ecc(struct yaffs_tags *tags)
-{
- unsigned ecc = tags->ecc;
-
- yaffs_calc_tags_ecc(tags);
-
- ecc ^= tags->ecc;
-
- if (ecc && ecc <= 64) {
- /* TODO: Handle the failure better. Retire? */
- unsigned char *b = ((union yaffs_tags_union *)tags)->as_bytes;
-
- ecc--;
-
- b[ecc / 8] ^= (1 << (ecc & 7));
-
- /* Now recvalc the ecc */
- yaffs_calc_tags_ecc(tags);
-
- return 1; /* recovered error */
- } else if (ecc) {
- /* Wierd ecc failure value */
- /* TODO Need to do somethiong here */
- return -1; /* unrecovered error */
- }
- return 0;
-}
-
-/********** Tags **********/
-
-static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
- struct yaffs_tags *tags_ptr)
-{
- union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
-
- yaffs_calc_tags_ecc(tags_ptr);
-
- spare_ptr->tb0 = tu->as_bytes[0];
- spare_ptr->tb1 = tu->as_bytes[1];
- spare_ptr->tb2 = tu->as_bytes[2];
- spare_ptr->tb3 = tu->as_bytes[3];
- spare_ptr->tb4 = tu->as_bytes[4];
- spare_ptr->tb5 = tu->as_bytes[5];
- spare_ptr->tb6 = tu->as_bytes[6];
- spare_ptr->tb7 = tu->as_bytes[7];
-}
-
-static void yaffs_get_tags_from_spare(struct yaffs_dev *dev,
- struct yaffs_spare *spare_ptr,
- struct yaffs_tags *tags_ptr)
-{
- union yaffs_tags_union *tu = (union yaffs_tags_union *)tags_ptr;
- int result;
-
- tu->as_bytes[0] = spare_ptr->tb0;
- tu->as_bytes[1] = spare_ptr->tb1;
- tu->as_bytes[2] = spare_ptr->tb2;
- tu->as_bytes[3] = spare_ptr->tb3;
- tu->as_bytes[4] = spare_ptr->tb4;
- tu->as_bytes[5] = spare_ptr->tb5;
- tu->as_bytes[6] = spare_ptr->tb6;
- tu->as_bytes[7] = spare_ptr->tb7;
-
- result = yaffs_check_tags_ecc(tags_ptr);
- if (result > 0)
- dev->n_tags_ecc_fixed++;
- else if (result < 0)
- dev->n_tags_ecc_unfixed++;
-}
-
-static void yaffs_spare_init(struct yaffs_spare *spare)
-{
- memset(spare, 0xff, sizeof(struct yaffs_spare));
-}
-
-static int yaffs_wr_nand(struct yaffs_dev *dev,
- int nand_chunk, const u8 *data,
- struct yaffs_spare *spare)
-{
- int data_size = dev->data_bytes_per_chunk;
-
- return dev->drv.drv_write_chunk_fn(dev, nand_chunk,
- data, data_size,
- (u8 *) spare, sizeof(*spare));
-}
-
-static int yaffs_rd_chunk_nand(struct yaffs_dev *dev,
- int nand_chunk,
- u8 *data,
- struct yaffs_spare *spare,
- enum yaffs_ecc_result *ecc_result,
- int correct_errors)
-{
- int ret_val;
- struct yaffs_spare local_spare;
- int data_size;
- int spare_size;
- int ecc_result1, ecc_result2;
- u8 calc_ecc[3];
-
- if (!spare) {
- /* If we don't have a real spare, then we use a local one. */
- /* Need this for the calculation of the ecc */
- spare = &local_spare;
- }
- data_size = dev->data_bytes_per_chunk;
- spare_size = sizeof(struct yaffs_spare);
-
- if (dev->param.use_nand_ecc)
- return dev->drv.drv_read_chunk_fn(dev, nand_chunk,
- data, data_size,
- (u8 *) spare, spare_size,
- ecc_result);
-
-
- /* Handle the ECC at this level. */
-
- ret_val = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
- data, data_size,
- (u8 *)spare, spare_size,
- NULL);
- if (!data || !correct_errors)
- return ret_val;
-
- /* Do ECC correction if needed. */
- yaffs_ecc_calc(data, calc_ecc);
- ecc_result1 = yaffs_ecc_correct(data, spare->ecc1, calc_ecc);
- yaffs_ecc_calc(&data[256], calc_ecc);
- ecc_result2 = yaffs_ecc_correct(&data[256], spare->ecc2, calc_ecc);
-
- if (ecc_result1 > 0) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>>yaffs ecc error fix performed on chunk %d:0",
- nand_chunk);
- dev->n_ecc_fixed++;
- } else if (ecc_result1 < 0) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>>yaffs ecc error unfixed on chunk %d:0",
- nand_chunk);
- dev->n_ecc_unfixed++;
- }
-
- if (ecc_result2 > 0) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>>yaffs ecc error fix performed on chunk %d:1",
- nand_chunk);
- dev->n_ecc_fixed++;
- } else if (ecc_result2 < 0) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "**>>yaffs ecc error unfixed on chunk %d:1",
- nand_chunk);
- dev->n_ecc_unfixed++;
- }
-
- if (ecc_result1 || ecc_result2) {
- /* We had a data problem on this page */
- yaffs_handle_rd_data_error(dev, nand_chunk);
- }
-
- if (ecc_result1 < 0 || ecc_result2 < 0)
- *ecc_result = YAFFS_ECC_RESULT_UNFIXED;
- else if (ecc_result1 > 0 || ecc_result2 > 0)
- *ecc_result = YAFFS_ECC_RESULT_FIXED;
- else
- *ecc_result = YAFFS_ECC_RESULT_NO_ERROR;
-
- return ret_val;
-}
-
-/*
- * Functions for robustisizing
- */
-
-static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk)
-{
- int flash_block = nand_chunk / dev->param.chunks_per_block;
-
- /* Mark the block for retirement */
- yaffs_get_block_info(dev, flash_block + dev->block_offset)->
- needs_retiring = 1;
- yaffs_trace(YAFFS_TRACE_ERROR | YAFFS_TRACE_BAD_BLOCKS,
- "**>>Block %d marked for retirement",
- flash_block);
-
- /* TODO:
- * Just do a garbage collection on the affected block
- * then retire the block
- * NB recursion
- */
-}
-
-static int yaffs_tags_compat_wr(struct yaffs_dev *dev,
- int nand_chunk,
- const u8 *data, const struct yaffs_ext_tags *ext_tags)
-{
- struct yaffs_spare spare;
- struct yaffs_tags tags;
-
- yaffs_spare_init(&spare);
-
- if (ext_tags->is_deleted)
- spare.page_status = 0;
- else {
- tags.obj_id = ext_tags->obj_id;
- tags.chunk_id = ext_tags->chunk_id;
-
- tags.n_bytes_lsb = ext_tags->n_bytes & (1024 - 1);
-
- if (dev->data_bytes_per_chunk >= 1024)
- tags.n_bytes_msb = (ext_tags->n_bytes >> 10) & 3;
- else
- tags.n_bytes_msb = 3;
-
- tags.serial_number = ext_tags->serial_number;
-
- if (!dev->param.use_nand_ecc && data) {
- yaffs_ecc_calc(data, spare.ecc1);
- yaffs_ecc_calc(&data[256], spare.ecc2);
- }
-
- yaffs_load_tags_to_spare(&spare, &tags);
- }
- return yaffs_wr_nand(dev, nand_chunk, data, &spare);
-}
-
-static int yaffs_tags_compat_rd(struct yaffs_dev *dev,
- int nand_chunk,
- u8 *data, struct yaffs_ext_tags *ext_tags)
-{
- struct yaffs_spare spare;
- struct yaffs_tags tags;
- enum yaffs_ecc_result ecc_result = YAFFS_ECC_RESULT_UNKNOWN;
- static struct yaffs_spare spare_ff;
- static int init;
- int deleted;
-
- if (!init) {
- memset(&spare_ff, 0xff, sizeof(spare_ff));
- init = 1;
- }
-
- if (!yaffs_rd_chunk_nand(dev, nand_chunk,
- data, &spare, &ecc_result, 1))
- return YAFFS_FAIL;
-
- /* ext_tags may be NULL */
- if (!ext_tags)
- return YAFFS_OK;
-
- deleted = (hweight8(spare.page_status) < 7) ? 1 : 0;
-
- ext_tags->is_deleted = deleted;
- ext_tags->ecc_result = ecc_result;
- ext_tags->block_bad = 0; /* We're reading it */
- /* therefore it is not a bad block */
- ext_tags->chunk_used =
- memcmp(&spare_ff, &spare, sizeof(spare_ff)) ? 1 : 0;
-
- if (ext_tags->chunk_used) {
- yaffs_get_tags_from_spare(dev, &spare, &tags);
- ext_tags->obj_id = tags.obj_id;
- ext_tags->chunk_id = tags.chunk_id;
- ext_tags->n_bytes = tags.n_bytes_lsb;
-
- if (dev->data_bytes_per_chunk >= 1024)
- ext_tags->n_bytes |=
- (((unsigned)tags.n_bytes_msb) << 10);
-
- ext_tags->serial_number = tags.serial_number;
- }
-
- return YAFFS_OK;
-}
-
-static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int flash_block)
-{
- struct yaffs_spare spare;
-
- memset(&spare, 0xff, sizeof(struct yaffs_spare));
-
- spare.block_status = 'Y';
-
- yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block, NULL,
- &spare);
- yaffs_wr_nand(dev, flash_block * dev->param.chunks_per_block + 1,
- NULL, &spare);
-
- return YAFFS_OK;
-}
-
-static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
- int block_no,
- enum yaffs_block_state *state,
- u32 *seq_number)
-{
- struct yaffs_spare spare0, spare1;
- static struct yaffs_spare spare_ff;
- static int init;
- enum yaffs_ecc_result dummy;
-
- if (!init) {
- memset(&spare_ff, 0xff, sizeof(spare_ff));
- init = 1;
- }
-
- *seq_number = 0;
-
- /* Look for bad block markers in the first two chunks */
- yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block,
- NULL, &spare0, &dummy, 0);
- yaffs_rd_chunk_nand(dev, block_no * dev->param.chunks_per_block + 1,
- NULL, &spare1, &dummy, 0);
-
- if (hweight8(spare0.block_status & spare1.block_status) < 7)
- *state = YAFFS_BLOCK_STATE_DEAD;
- else if (memcmp(&spare_ff, &spare0, sizeof(spare_ff)) == 0)
- *state = YAFFS_BLOCK_STATE_EMPTY;
- else
- *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-
- return YAFFS_OK;
-}
-
-void yaffs_tags_compat_install(struct yaffs_dev *dev)
-{
- if(dev->param.is_yaffs2)
- return;
- if(!dev->tagger.write_chunk_tags_fn)
- dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_wr;
- if(!dev->tagger.read_chunk_tags_fn)
- dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_rd;
- if(!dev->tagger.query_block_fn)
- dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
- if(!dev->tagger.mark_bad_fn)
- dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_TAGSCOMPAT_H__
-#define __YAFFS_TAGSCOMPAT_H__
-
-
-#include "yaffs_guts.h"
-
-#if 0
-
-
-int yaffs_tags_compat_wr(struct yaffs_dev *dev,
- int nand_chunk,
- const u8 *data, const struct yaffs_ext_tags *tags);
-int yaffs_tags_compat_rd(struct yaffs_dev *dev,
- int nand_chunk,
- u8 *data, struct yaffs_ext_tags *tags);
-int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no);
-int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
- int block_no,
- enum yaffs_block_state *state,
- u32 *seq_number);
-
-#endif
-
-
-void yaffs_tags_compat_install(struct yaffs_dev *dev);
-void yaffs_calc_tags_ecc(struct yaffs_tags *tags);
-int yaffs_check_tags_ecc(struct yaffs_tags *tags);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_packedtags2.h"
-
-static int yaffs_tags_marshall_write(struct yaffs_dev *dev,
- int nand_chunk, const u8 *data,
- const struct yaffs_ext_tags *tags)
-{
- struct yaffs_packed_tags2 pt;
- int retval;
-
- int packed_tags_size =
- dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
- void *packed_tags_ptr =
- dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
-
- yaffs_trace(YAFFS_TRACE_MTD,
- "yaffs_tags_marshall_write chunk %d data %p tags %p",
- nand_chunk, data, tags);
-
- /* For yaffs2 writing there must be both data and tags.
- * If we're using inband tags, then the tags are stuffed into
- * the end of the data buffer.
- */
- if (!data || !tags)
- BUG();
- else if (dev->param.inband_tags) {
- struct yaffs_packed_tags2_tags_only *pt2tp;
- pt2tp =
- (struct yaffs_packed_tags2_tags_only *)(data +
- dev->
- data_bytes_per_chunk);
- yaffs_pack_tags2_tags_only(pt2tp, tags);
- } else {
- yaffs_pack_tags2(&pt, tags, !dev->param.no_tags_ecc);
- }
-
- retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
- data, dev->param.total_bytes_per_chunk,
- (dev->param.inband_tags) ? NULL : packed_tags_ptr,
- (dev->param.inband_tags) ? 0 : packed_tags_size);
-
- return retval;
-}
-
-static int yaffs_tags_marshall_read(struct yaffs_dev *dev,
- int nand_chunk, u8 *data,
- struct yaffs_ext_tags *tags)
-{
- int retval = 0;
- int local_data = 0;
- u8 spare_buffer[100];
- enum yaffs_ecc_result ecc_result;
-
- struct yaffs_packed_tags2 pt;
-
- int packed_tags_size =
- dev->param.no_tags_ecc ? sizeof(pt.t) : sizeof(pt);
- void *packed_tags_ptr =
- dev->param.no_tags_ecc ? (void *)&pt.t : (void *)&pt;
-
- yaffs_trace(YAFFS_TRACE_MTD,
- "yaffs_tags_marshall_read chunk %d data %p tags %p",
- nand_chunk, data, tags);
-
- if (dev->param.inband_tags) {
- if (!data) {
- local_data = 1;
- data = yaffs_get_temp_buffer(dev);
- }
- }
-
- if (dev->param.inband_tags || (data && !tags))
- retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
- data, dev->param.total_bytes_per_chunk,
- NULL, 0,
- &ecc_result);
- else if (tags)
- retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
- data, dev->param.total_bytes_per_chunk,
- spare_buffer, packed_tags_size,
- &ecc_result);
- else
- BUG();
-
-
- if (dev->param.inband_tags) {
- if (tags) {
- struct yaffs_packed_tags2_tags_only *pt2tp;
- pt2tp =
- (struct yaffs_packed_tags2_tags_only *)
- &data[dev->data_bytes_per_chunk];
- yaffs_unpack_tags2_tags_only(tags, pt2tp);
- }
- } else if (tags) {
- memcpy(packed_tags_ptr, spare_buffer, packed_tags_size);
- yaffs_unpack_tags2(tags, &pt, !dev->param.no_tags_ecc);
- }
-
- if (local_data)
- yaffs_release_temp_buffer(dev, data);
-
- if (tags && ecc_result == YAFFS_ECC_RESULT_UNFIXED) {
- tags->ecc_result = YAFFS_ECC_RESULT_UNFIXED;
- dev->n_ecc_unfixed++;
- }
-
- if (tags && ecc_result == -YAFFS_ECC_RESULT_FIXED) {
- if (tags->ecc_result <= YAFFS_ECC_RESULT_NO_ERROR)
- tags->ecc_result = YAFFS_ECC_RESULT_FIXED;
- dev->n_ecc_fixed++;
- }
-
- if (ecc_result < YAFFS_ECC_RESULT_UNFIXED)
- return YAFFS_OK;
- else
- return YAFFS_FAIL;
-}
-
-static int yaffs_tags_marshall_query_block(struct yaffs_dev *dev, int block_no,
- enum yaffs_block_state *state,
- u32 *seq_number)
-{
- int retval;
-
- yaffs_trace(YAFFS_TRACE_MTD, "yaffs_tags_marshall_query_block %d",
- block_no);
-
- retval = dev->drv.drv_check_bad_fn(dev, block_no);
-
- if (retval== YAFFS_FAIL) {
- yaffs_trace(YAFFS_TRACE_MTD, "block is bad");
-
- *state = YAFFS_BLOCK_STATE_DEAD;
- *seq_number = 0;
- } else {
- struct yaffs_ext_tags t;
-
- yaffs_tags_marshall_read(dev,
- block_no * dev->param.chunks_per_block,
- NULL, &t);
-
- if (t.chunk_used) {
- *seq_number = t.seq_number;
- *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
- } else {
- *seq_number = 0;
- *state = YAFFS_BLOCK_STATE_EMPTY;
- }
- }
-
- yaffs_trace(YAFFS_TRACE_MTD,
- "block query returns seq %d state %d",
- *seq_number, *state);
-
- if (retval == 0)
- return YAFFS_OK;
- else
- return YAFFS_FAIL;
-}
-
-static int yaffs_tags_marshall_mark_bad(struct yaffs_dev *dev, int block_no)
-{
- return dev->drv.drv_mark_bad_fn(dev, block_no);
-
-}
-
-
-void yaffs_tags_marshall_install(struct yaffs_dev *dev)
-{
- if (!dev->param.is_yaffs2)
- return;
-
- if (!dev->tagger.write_chunk_tags_fn)
- dev->tagger.write_chunk_tags_fn = yaffs_tags_marshall_write;
-
- if (!dev->tagger.read_chunk_tags_fn)
- dev->tagger.read_chunk_tags_fn = yaffs_tags_marshall_read;
-
- if (!dev->tagger.query_block_fn)
- dev->tagger.query_block_fn = yaffs_tags_marshall_query_block;
-
- if (!dev->tagger.mark_bad_fn)
- dev->tagger.mark_bad_fn = yaffs_tags_marshall_mark_bad;
-
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_TAGSMARSHALL_H__
-#define __YAFFS_TAGSMARSHALL_H__
-
-#include "yaffs_guts.h"
-void yaffs_tags_marshall_install(struct yaffs_dev *dev);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_trace_mask;
-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_MOUNT 0x00800000
-
-#define YAFFS_TRACE_ERROR 0x40000000
-#define YAFFS_TRACE_BUG 0x80000000
-#define YAFFS_TRACE_ALWAYS 0xf0000000
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_skip_verification(struct yaffs_dev *dev)
-{
- (void) dev;
- return !(yaffs_trace_mask &
- (YAFFS_TRACE_VERIFY | YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_skip_full_verification(struct yaffs_dev *dev)
-{
- (void) dev;
- return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_FULL));
-}
-
-static int yaffs_skip_nand_verification(struct yaffs_dev *dev)
-{
- (void) dev;
- return !(yaffs_trace_mask & (YAFFS_TRACE_VERIFY_NAND));
-}
-
-static const char * const block_state_name[] = {
- "Unknown",
- "Needs scan",
- "Scanning",
- "Empty",
- "Allocating",
- "Full",
- "Dirty",
- "Checkpoint",
- "Collecting",
- "Dead"
-};
-
-void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi, int n)
-{
- int actually_used;
- int in_use;
-
- if (yaffs_skip_verification(dev))
- return;
-
- /* Report illegal runtime states */
- if (bi->block_state >= YAFFS_NUMBER_OF_BLOCK_STATES)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Block %d has undefined state %d",
- n, bi->block_state);
-
- switch (bi->block_state) {
- case YAFFS_BLOCK_STATE_UNKNOWN:
- case YAFFS_BLOCK_STATE_SCANNING:
- case YAFFS_BLOCK_STATE_NEEDS_SCAN:
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Block %d has bad run-state %s",
- n, block_state_name[bi->block_state]);
- }
-
- /* Check pages in use and soft deletions are legal */
-
- actually_used = bi->pages_in_use - bi->soft_del_pages;
-
- if (bi->pages_in_use < 0 ||
- bi->pages_in_use > dev->param.chunks_per_block ||
- bi->soft_del_pages < 0 ||
- bi->soft_del_pages > dev->param.chunks_per_block ||
- actually_used < 0 || actually_used > dev->param.chunks_per_block)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Block %d has illegal values pages_in_used %d soft_del_pages %d",
- n, bi->pages_in_use, bi->soft_del_pages);
-
- /* Check chunk bitmap legal */
- in_use = yaffs_count_chunk_bits(dev, n);
- if (in_use != bi->pages_in_use)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Block %d has inconsistent values pages_in_use %d counted chunk bits %d",
- n, bi->pages_in_use, in_use);
-}
-
-void yaffs_verify_collected_blk(struct yaffs_dev *dev,
- struct yaffs_block_info *bi, int n)
-{
- yaffs_verify_blk(dev, bi, n);
-
- /* After collection the block should be in the erased state */
-
- if (bi->block_state != YAFFS_BLOCK_STATE_COLLECTING &&
- bi->block_state != YAFFS_BLOCK_STATE_EMPTY) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "Block %d is in state %d after gc, should be erased",
- n, bi->block_state);
- }
-}
-
-void yaffs_verify_blocks(struct yaffs_dev *dev)
-{
- int i;
- int state_count[YAFFS_NUMBER_OF_BLOCK_STATES];
- int illegal_states = 0;
-
- if (yaffs_skip_verification(dev))
- return;
-
- memset(state_count, 0, sizeof(state_count));
-
- for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- struct yaffs_block_info *bi = yaffs_get_block_info(dev, i);
- yaffs_verify_blk(dev, bi, i);
-
- if (bi->block_state < YAFFS_NUMBER_OF_BLOCK_STATES)
- state_count[bi->block_state]++;
- else
- illegal_states++;
- }
-
- yaffs_trace(YAFFS_TRACE_VERIFY, "Block summary");
-
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "%d blocks have illegal states",
- illegal_states);
- if (state_count[YAFFS_BLOCK_STATE_ALLOCATING] > 1)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Too many allocating blocks");
-
- for (i = 0; i < YAFFS_NUMBER_OF_BLOCK_STATES; i++)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "%s %d blocks",
- block_state_name[i], state_count[i]);
-
- if (dev->blocks_in_checkpt != state_count[YAFFS_BLOCK_STATE_CHECKPOINT])
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Checkpoint block count wrong dev %d count %d",
- dev->blocks_in_checkpt,
- state_count[YAFFS_BLOCK_STATE_CHECKPOINT]);
-
- if (dev->n_erased_blocks != state_count[YAFFS_BLOCK_STATE_EMPTY])
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Erased block count wrong dev %d count %d",
- dev->n_erased_blocks,
- state_count[YAFFS_BLOCK_STATE_EMPTY]);
-
- if (state_count[YAFFS_BLOCK_STATE_COLLECTING] > 1)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Too many collecting blocks %d (max is 1)",
- state_count[YAFFS_BLOCK_STATE_COLLECTING]);
-}
-
-/*
- * 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_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
- struct yaffs_ext_tags *tags, int parent_check)
-{
- if (obj && yaffs_skip_verification(obj->my_dev))
- return;
-
- if (!(tags && obj && oh)) {
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Verifying object header tags %p obj %p oh %p",
- tags, obj, oh);
- return;
- }
-
- if (oh->type <= YAFFS_OBJECT_TYPE_UNKNOWN ||
- oh->type > YAFFS_OBJECT_TYPE_MAX)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d header type is illegal value 0x%x",
- tags->obj_id, oh->type);
-
- if (tags->obj_id != obj->obj_id)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d header mismatch obj_id %d",
- tags->obj_id, obj->obj_id);
-
- /*
- * Check that the object's parent ids match if parent_check requested.
- *
- * Tests do not apply to the root object.
- */
-
- if (parent_check && tags->obj_id > 1 && !obj->parent)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d header mismatch parent_id %d obj->parent is NULL",
- tags->obj_id, oh->parent_obj_id);
-
- if (parent_check && obj->parent &&
- oh->parent_obj_id != obj->parent->obj_id &&
- (oh->parent_obj_id != YAFFS_OBJECTID_UNLINKED ||
- obj->parent->obj_id != YAFFS_OBJECTID_DELETED))
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d header mismatch parent_id %d parent_obj_id %d",
- tags->obj_id, oh->parent_obj_id,
- obj->parent->obj_id);
-
- if (tags->obj_id > 1 && oh->name[0] == 0) /* Null name */
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d header name is NULL",
- obj->obj_id);
-
- if (tags->obj_id > 1 && ((u8) (oh->name[0])) == 0xff) /* Junk name */
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d header name is 0xff",
- obj->obj_id);
-}
-
-void yaffs_verify_file(struct yaffs_obj *obj)
-{
- u32 x;
- int required_depth;
- int actual_depth;
- int last_chunk;
- u32 offset_in_chunk;
- u32 the_chunk;
-
- u32 i;
- struct yaffs_dev *dev;
- struct yaffs_ext_tags tags;
- struct yaffs_tnode *tn;
- u32 obj_id;
-
- if (!obj)
- return;
-
- if (yaffs_skip_verification(obj->my_dev))
- return;
-
- dev = obj->my_dev;
- obj_id = obj->obj_id;
-
-
- /* Check file size is consistent with tnode depth */
- yaffs_addr_to_chunk(dev, obj->variant.file_variant.file_size,
- &last_chunk, &offset_in_chunk);
- last_chunk++;
- x = last_chunk >> YAFFS_TNODES_LEVEL0_BITS;
- required_depth = 0;
- while (x > 0) {
- x >>= YAFFS_TNODES_INTERNAL_BITS;
- required_depth++;
- }
-
- actual_depth = obj->variant.file_variant.top_level;
-
- /* 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_skip_nand_verification(dev))
- return;
-
- for (i = 1; i <= last_chunk; i++) {
- tn = yaffs_find_tnode_0(dev, &obj->variant.file_variant, i);
-
- if (!tn)
- continue;
-
- the_chunk = yaffs_get_group_base(dev, tn, i);
- if (the_chunk > 0) {
- yaffs_rd_chunk_tags_nand(dev, the_chunk, NULL,
- &tags);
- if (tags.obj_id != obj_id || tags.chunk_id != i)
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Object %d chunk_id %d NAND mismatch chunk %d tags (%d:%d)",
- obj_id, i, the_chunk,
- tags.obj_id, tags.chunk_id);
- }
- }
-}
-
-void yaffs_verify_link(struct yaffs_obj *obj)
-{
- if (obj && yaffs_skip_verification(obj->my_dev))
- return;
-
- /* Verify sane equivalent object */
-}
-
-void yaffs_verify_symlink(struct yaffs_obj *obj)
-{
- if (obj && yaffs_skip_verification(obj->my_dev))
- return;
-
- /* Verify symlink string */
-}
-
-void yaffs_verify_special(struct yaffs_obj *obj)
-{
- if (obj && yaffs_skip_verification(obj->my_dev))
- return;
-}
-
-void yaffs_verify_obj(struct yaffs_obj *obj)
-{
- struct yaffs_dev *dev;
- u32 chunk_min;
- u32 chunk_max;
- u32 chunk_id_ok;
- u32 chunk_in_range;
- u32 chunk_wrongly_deleted;
- u32 chunk_valid;
-
- if (!obj)
- return;
-
- if (obj->being_created)
- return;
-
- dev = obj->my_dev;
-
- if (yaffs_skip_verification(dev))
- return;
-
- /* Check sane object header chunk */
-
- chunk_min = dev->internal_start_block * dev->param.chunks_per_block;
- chunk_max =
- (dev->internal_end_block + 1) * dev->param.chunks_per_block - 1;
-
- chunk_in_range = (((unsigned)(obj->hdr_chunk)) >= chunk_min &&
- ((unsigned)(obj->hdr_chunk)) <= chunk_max);
- chunk_id_ok = chunk_in_range || (obj->hdr_chunk == 0);
- chunk_valid = chunk_in_range &&
- yaffs_check_chunk_bit(dev,
- obj->hdr_chunk / dev->param.chunks_per_block,
- obj->hdr_chunk % dev->param.chunks_per_block);
- chunk_wrongly_deleted = chunk_in_range && !chunk_valid;
-
- if (!obj->fake && (!chunk_id_ok || chunk_wrongly_deleted))
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d has chunk_id %d %s %s",
- obj->obj_id, obj->hdr_chunk,
- chunk_id_ok ? "" : ",out of range",
- chunk_wrongly_deleted ? ",marked as deleted" : "");
-
- if (chunk_valid && !yaffs_skip_nand_verification(dev)) {
- struct yaffs_ext_tags tags;
- struct yaffs_obj_hdr *oh;
- u8 *buffer = yaffs_get_temp_buffer(dev);
-
- oh = (struct yaffs_obj_hdr *)buffer;
-
- yaffs_rd_chunk_tags_nand(dev, obj->hdr_chunk, buffer, &tags);
-
- yaffs_verify_oh(obj, oh, &tags, 1);
-
- yaffs_release_temp_buffer(dev, buffer);
- }
-
- /* Verify it has a parent */
- if (obj && !obj->fake && (!obj->parent || obj->parent->my_dev != dev)) {
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d has parent pointer %p which does not look like an object",
- obj->obj_id, obj->parent);
- }
-
- /* Verify parent is a directory */
- if (obj->parent &&
- obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d's parent is not a directory (type %d)",
- obj->obj_id, obj->parent->variant_type);
- }
-
- switch (obj->variant_type) {
- case YAFFS_OBJECT_TYPE_FILE:
- yaffs_verify_file(obj);
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- yaffs_verify_symlink(obj);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- yaffs_verify_dir(obj);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- yaffs_verify_link(obj);
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- yaffs_verify_special(obj);
- break;
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- default:
- yaffs_trace(YAFFS_TRACE_VERIFY,
- "Obj %d has illegaltype %d",
- obj->obj_id, obj->variant_type);
- break;
- }
-}
-
-void yaffs_verify_objects(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj;
- int i;
- struct list_head *lh;
-
- if (yaffs_skip_verification(dev))
- return;
-
- /* Iterate through the objects in each hash entry */
-
- for (i = 0; i < YAFFS_NOBJECT_BUCKETS; i++) {
- list_for_each(lh, &dev->obj_bucket[i].list) {
- obj = list_entry(lh, struct yaffs_obj, hash_link);
- yaffs_verify_obj(obj);
- }
- }
-}
-
-void yaffs_verify_obj_in_dir(struct yaffs_obj *obj)
-{
- struct list_head *lh;
- struct yaffs_obj *list_obj;
- int count = 0;
-
- if (!obj) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "No object to verify");
- BUG();
- return;
- }
-
- if (yaffs_skip_verification(obj->my_dev))
- return;
-
- if (!obj->parent) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "Object does not have parent");
- BUG();
- return;
- }
-
- if (obj->parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "Parent is not directory");
- BUG();
- }
-
- /* Iterate through the objects in each hash entry */
-
- list_for_each(lh, &obj->parent->variant.dir_variant.children) {
- list_obj = list_entry(lh, struct yaffs_obj, siblings);
- yaffs_verify_obj(list_obj);
- if (obj == list_obj)
- count++;
- }
-
- if (count != 1) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Object in directory %d times",
- count);
- BUG();
- }
-}
-
-void yaffs_verify_dir(struct yaffs_obj *directory)
-{
- struct list_head *lh;
- struct yaffs_obj *list_obj;
-
- if (!directory) {
- BUG();
- return;
- }
-
- if (yaffs_skip_full_verification(directory->my_dev))
- return;
-
- if (directory->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Directory has wrong type: %d",
- directory->variant_type);
- BUG();
- }
-
- /* Iterate through the objects in each hash entry */
-
- list_for_each(lh, &directory->variant.dir_variant.children) {
- list_obj = list_entry(lh, struct yaffs_obj, siblings);
- if (list_obj->parent != directory) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Object in directory list has wrong parent %p",
- list_obj->parent);
- BUG();
- }
- yaffs_verify_obj_in_dir(list_obj);
- }
-}
-
-static int yaffs_free_verification_failures;
-
-void yaffs_verify_free_chunks(struct yaffs_dev *dev)
-{
- int counted;
- int difference;
-
- if (yaffs_skip_verification(dev))
- return;
-
- counted = yaffs_count_free_chunks(dev);
-
- difference = dev->n_free_chunks - counted;
-
- if (difference) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Freechunks verification failure %d %d %d",
- dev->n_free_chunks, counted, difference);
- yaffs_free_verification_failures++;
- }
-}
-
-int yaffs_verify_file_sane(struct yaffs_obj *in)
-{
- (void) in;
- return YAFFS_OK;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_VERIFY_H__
-#define __YAFFS_VERIFY_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_verify_blk(struct yaffs_dev *dev, struct yaffs_block_info *bi,
- int n);
-void yaffs_verify_collected_blk(struct yaffs_dev *dev,
- struct yaffs_block_info *bi, int n);
-void yaffs_verify_blocks(struct yaffs_dev *dev);
-
-void yaffs_verify_oh(struct yaffs_obj *obj, struct yaffs_obj_hdr *oh,
- struct yaffs_ext_tags *tags, int parent_check);
-void yaffs_verify_file(struct yaffs_obj *obj);
-void yaffs_verify_link(struct yaffs_obj *obj);
-void yaffs_verify_symlink(struct yaffs_obj *obj);
-void yaffs_verify_special(struct yaffs_obj *obj);
-void yaffs_verify_obj(struct yaffs_obj *obj);
-void yaffs_verify_objects(struct yaffs_dev *dev);
-void yaffs_verify_obj_in_dir(struct yaffs_obj *obj);
-void yaffs_verify_dir(struct yaffs_obj *directory);
-void yaffs_verify_free_chunks(struct yaffs_dev *dev);
-
-int yaffs_verify_file_sane(struct yaffs_obj *obj);
-
-int yaffs_skip_verification(struct yaffs_dev *dev);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 struct yaffs_dev associated with
- * this superblock
- * >> 2.6: sb->s_fs_info points to the struct yaffs_dev associated with this
- * superblock
- * >> inode->u.generic_ip points to the associated struct yaffs_obj.
- */
-
-/*
- * 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(3, 6, 0))
-#define YAFFS_HAS_WRITE_SUPER
-#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>
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 39))
-#include <linux/smp_lock.h>
-#endif
-#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, 27))
-#define YAFFS_USE_WRITE_BEGIN_END 1
-#else
-#define YAFFS_USE_WRITE_BEGIN_END 0
-#endif
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 6, 0))
-#define YAFFS_SUPER_HAS_DIRTY
-#endif
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 2, 0))
-#define set_nlink(inode, count) do { (inode)->i_nlink = (count); } while(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_attribs.h"
-
-#include "yaffs_linux.h"
-
-#include "yaffs_mtdif.h"
-#include "yaffs_packedtags2.h"
-#include "yaffs_getblockinfo.h"
-
-unsigned int yaffs_trace_mask =
- YAFFS_TRACE_BAD_BLOCKS |
- YAFFS_TRACE_ALWAYS |
- 0;
-
-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;
-unsigned int yaffs_auto_select = 1;
-/* Module Parameters */
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-module_param(yaffs_trace_mask, 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_trace_mask, "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))
-
-#else
-/* Call local equivalent */
-#define YAFFS_USE_OWN_IGET
-#define Y_IGET(sb, inum) yaffs_iget((sb), (inum))
-
-#endif
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 18))
-#define yaffs_inode_to_obj_lv(iptr) ((iptr)->i_private)
-#else
-#define yaffs_inode_to_obj_lv(iptr) ((iptr)->u.generic_ip)
-#endif
-
-#define yaffs_inode_to_obj(iptr) \
- ((struct yaffs_obj *)(yaffs_inode_to_obj_lv(iptr)))
-#define yaffs_dentry_to_obj(dptr) yaffs_inode_to_obj((dptr)->d_inode)
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
-#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->s_fs_info)
-#else
-#define yaffs_super_to_dev(sb) ((struct yaffs_dev *)sb->u.generic_sbp)
-#endif
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 5, 0))
-#define Y_CLEAR_INODE(i) clear_inode(i)
-#else
-#define Y_CLEAR_INODE(i) end_writeback(i)
-#endif
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 12, 0))
-#define YAFFS_USE_DIR_ITERATE
-#endif
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3,12,0))
-#define YAFFS_NEW_PROCFS
-#include <linux/seq_file.h>
-#endif
-
-
-#define update_dir_time(dir) do {\
- (dir)->i_ctime = (dir)->i_mtime = CURRENT_TIME; \
- } while (0)
-
-static void yaffs_fill_inode_from_obj(struct inode *inode,
- struct yaffs_obj *obj);
-
-
-static void yaffs_gross_lock(struct yaffs_dev *dev)
-{
- yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locking %p", current);
- mutex_lock(&(yaffs_dev_to_lc(dev)->gross_lock));
- yaffs_trace(YAFFS_TRACE_LOCK, "yaffs locked %p", current);
-}
-
-static void yaffs_gross_unlock(struct yaffs_dev *dev)
-{
- yaffs_trace(YAFFS_TRACE_LOCK, "yaffs unlocking %p", current);
- mutex_unlock(&(yaffs_dev_to_lc(dev)->gross_lock));
-}
-
-
-static int yaffs_readpage_nolock(struct file *f, struct page *pg)
-{
- /* Lifted from jffs2 */
-
- struct yaffs_obj *obj;
- unsigned char *pg_buf;
- int ret;
- loff_t pos = ((loff_t) pg->index) << PAGE_CACHE_SHIFT;
- struct yaffs_dev *dev;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readpage_nolock at %lld, size %08x",
- (long long)pos,
- (unsigned)PAGE_CACHE_SIZE);
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- dev = obj->my_dev;
-
-#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_gross_lock(dev);
-
- ret = yaffs_file_rd(obj, pg_buf, pos, PAGE_CACHE_SIZE);
-
- yaffs_gross_unlock(dev);
-
- if (ret >= 0)
- ret = 0;
-
- if (ret) {
- ClearPageUptodate(pg);
- SetPageError(pg);
- } else {
- SetPageUptodate(pg);
- ClearPageError(pg);
- }
-
- flush_dcache_page(pg);
- kunmap(pg);
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage_nolock done");
- 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;
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage");
- ret = yaffs_readpage_unlock(f, pg);
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_readpage done");
- return ret;
-}
-
-
-static void yaffs_set_super_dirty_val(struct yaffs_dev *dev, int val)
-{
- struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
-
- if (lc)
- lc->dirty = val;
-
-# ifdef YAFFS_SUPER_HAS_DIRTY
- {
- struct super_block *sb = lc->super;
-
- if (sb)
- sb->s_dirt = val;
- }
-#endif
-
-}
-
-static void yaffs_set_super_dirty(struct yaffs_dev *dev)
-{
- yaffs_set_super_dirty_val(dev, 1);
-}
-
-static void yaffs_clear_super_dirty(struct yaffs_dev *dev)
-{
- yaffs_set_super_dirty_val(dev, 0);
-}
-
-static int yaffs_check_super_dirty(struct yaffs_dev *dev)
-{
- struct yaffs_linux_context *lc = yaffs_dev_to_lc(dev);
-
- if (lc && lc->dirty)
- return 1;
-
-# ifdef YAFFS_SUPER_HAS_DIRTY
- {
- struct super_block *sb = lc->super;
-
- if (sb && sb->s_dirt)
- return 1;
- }
-#endif
- return 0;
-
-}
-
-#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 yaffs_dev *dev;
- struct address_space *mapping = page->mapping;
- struct inode *inode;
- unsigned long end_index;
- char *buffer;
- struct yaffs_obj *obj;
- int n_written = 0;
- unsigned n_bytes;
- 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)
- n_bytes = PAGE_CACHE_SIZE;
- else {
- n_bytes = i_size & (PAGE_CACHE_SIZE - 1);
-
- if (page->index > end_index || !n_bytes) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_writepage at %lld, inode size = %lld!!",
- ((loff_t)page->index) << PAGE_CACHE_SHIFT,
- inode->i_size);
- yaffs_trace(YAFFS_TRACE_OS,
- " -> don't care!!");
-
- zero_user_segment(page, 0, PAGE_CACHE_SIZE);
- set_page_writeback(page);
- unlock_page(page);
- end_page_writeback(page);
- return 0;
- }
- }
-
- if (n_bytes != PAGE_CACHE_SIZE)
- zero_user_segment(page, n_bytes, PAGE_CACHE_SIZE);
-
- get_page(page);
-
- buffer = kmap(page);
-
- obj = yaffs_inode_to_obj(inode);
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_writepage at %lld, size %08x",
- ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes);
- yaffs_trace(YAFFS_TRACE_OS,
- "writepag0: obj = %lld, ino = %lld",
- obj->variant.file_variant.file_size, inode->i_size);
-
- n_written = yaffs_wr_file(obj, buffer,
- ((loff_t)page->index) << PAGE_CACHE_SHIFT, n_bytes, 0);
-
- yaffs_set_super_dirty(dev);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "writepag1: obj = %lld, ino = %lld",
- obj->variant.file_variant.file_size, inode->i_size);
-
- yaffs_gross_unlock(dev);
-
- kunmap(page);
- set_page_writeback(page);
- unlock_page(page);
- end_page_writeback(page);
- put_page(page);
-
- return (n_written == n_bytes) ? 0 : -ENOSPC;
-}
-
-/* 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)
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
-
- int n_free_chunks;
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- n_free_chunks = yaffs_get_n_free_chunks(dev);
-
- yaffs_gross_unlock(dev);
-
- return (n_free_chunks > 20) ? 1 : 0;
-}
-
-static void yaffs_release_space(struct file *f)
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- yaffs_gross_unlock(dev);
-}
-
-#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;
- }
- yaffs_trace(YAFFS_TRACE_OS,
- "start yaffs_write_begin index %d(%x) uptodate %d",
- (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 */
- yaffs_trace(YAFFS_TRACE_OS, "end yaffs_write_begin - ok");
-
- return 0;
-
-out:
- yaffs_trace(YAFFS_TRACE_OS,
- "end yaffs_write_begin fail returning %d", 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)
-{
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_prepair_write");
-
- if (!Page_Uptodate(pg))
- return yaffs_readpage_nolock(f, pg);
- return 0;
-}
-#endif
-
-
-static ssize_t yaffs_file_write(struct file *f, const char *buf, size_t n,
- loff_t * pos)
-{
- struct yaffs_obj *obj;
- int n_written;
- loff_t ipos;
- struct inode *inode;
- struct yaffs_dev *dev;
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
-
- if (!obj) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_file_write: hey obj is null!");
- return -EINVAL;
- }
-
- dev = obj->my_dev;
-
- yaffs_gross_lock(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;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_file_write about to write writing %u(%x) bytes to object %d at %lld",
- (unsigned)n, (unsigned)n, obj->obj_id, ipos);
-
- n_written = yaffs_wr_file(obj, buf, ipos, n, 0);
-
- yaffs_set_super_dirty(dev);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_file_write: %d(%x) bytes written",
- (unsigned)n, (unsigned)n);
-
- if (n_written > 0) {
- ipos += n_written;
- *pos = ipos;
- if (ipos > inode->i_size) {
- inode->i_size = ipos;
- inode->i_blocks = (ipos + 511) >> 9;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_file_write size updated to %lld bytes, %d blocks",
- ipos, (int)(inode->i_blocks));
- }
-
- }
- yaffs_gross_unlock(dev);
- return (n_written == 0) && (n > 0) ? -ENOSPC : n_written;
-}
-
-
-#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;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_write_end addr %p pos %lld n_bytes %d",
- addr, pos, copied);
-
- ret = yaffs_file_write(filp, addr, copied, &pos);
-
- if (ret != copied) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_write_end not same size ret %d copied %d",
- ret, copied);
- SetPageError(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 n_bytes = to - offset;
- int n_written;
-
- kva = kmap(pg);
- addr = kva + offset;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_commit_write addr %p pos %lld n_bytes %d",
- addr, pos, n_bytes);
-
- n_written = yaffs_file_write(f, addr, n_bytes, &pos);
-
- if (n_written != n_bytes) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_commit_write not same size n_written %d n_bytes %d",
- n_written, n_bytes);
- SetPageError(pg);
- }
- kunmap(pg);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_commit_write returning %d",
- n_written == n_bytes ? 0 : n_written);
-
- return n_written == n_bytes ? 0 : n_written;
-}
-#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, 17))
-static int yaffs_file_flush(struct file *file, fl_owner_t id)
-#else
-static int yaffs_file_flush(struct file *file)
-#endif
-{
- struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
-
- struct yaffs_dev *dev = obj->my_dev;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_file_flush object %d (%s)",
- obj->obj_id,
- obj->dirty ? "dirty" : "clean");
-
- yaffs_gross_lock(dev);
-
- yaffs_flush_file(obj, 1, 0, 0);
-
- yaffs_gross_unlock(dev);
-
- return 0;
-}
-
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
-static int yaffs_sync_object(struct file *file, loff_t start, loff_t end, int datasync)
-#elif (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
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 34))
- struct dentry *dentry = file->f_path.dentry;
-#endif
-
- obj = yaffs_dentry_to_obj(dentry);
-
- dev = obj->my_dev;
-
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
- "yaffs_sync_object");
- yaffs_gross_lock(dev);
- yaffs_flush_file(obj, 1, datasync, 0);
- yaffs_gross_unlock(dev);
- return 0;
-}
-
-
-#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 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 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_setattr(struct dentry *dentry, struct iattr *attr)
-{
- struct inode *inode = dentry->d_inode;
- int error = 0;
- struct yaffs_dev *dev;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_setattr of object %d",
- yaffs_inode_to_obj(inode)->obj_id);
-#if 0
- /* Fail if a requested resize >= 2GB */
- if (attr->ia_valid & ATTR_SIZE && (attr->ia_size >> 31))
- error = -EINVAL;
-#endif
-
- if (error == 0)
- error = inode_change_ok(inode, attr);
- if (error == 0) {
- int result;
- if (!error) {
- error = yaffs_vfs_setattr(inode, attr);
- yaffs_trace(YAFFS_TRACE_OS, "inode_setattr called");
- if (attr->ia_valid & ATTR_SIZE) {
- yaffs_vfs_setsize(inode, attr->ia_size);
- inode->i_blocks = (inode->i_size + 511) >> 9;
- }
- }
- dev = yaffs_inode_to_obj(inode)->my_dev;
- if (attr->ia_valid & ATTR_SIZE) {
- yaffs_trace(YAFFS_TRACE_OS,
- "resize to %d(%x)",
- (int)(attr->ia_size),
- (int)(attr->ia_size));
- }
- yaffs_gross_lock(dev);
- result = yaffs_set_attribs(yaffs_inode_to_obj(inode), attr);
- if (result == YAFFS_OK) {
- error = 0;
- } else {
- error = -EPERM;
- }
- yaffs_gross_unlock(dev);
-
- }
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_setattr done returning %d", error);
-
- return error;
-}
-
-static 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;
- struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr of object %d", obj->obj_id);
-
- if (error == 0) {
- int result;
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- result = yaffs_set_xattrib(obj, name, value, size, flags);
- if (result == YAFFS_OK)
- error = 0;
- else if (result < 0)
- error = result;
- yaffs_gross_unlock(dev);
-
- }
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_setxattr done returning %d", error);
-
- return error;
-}
-
-static ssize_t yaffs_getxattr(struct dentry * dentry, const char *name,
- void *buff, size_t size)
-{
- struct inode *inode = dentry->d_inode;
- int error = 0;
- struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_getxattr \"%s\" from object %d",
- name, obj->obj_id);
-
- if (error == 0) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- error = yaffs_get_xattrib(obj, name, buff, size);
- yaffs_gross_unlock(dev);
-
- }
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_getxattr done returning %d", error);
-
- return error;
-}
-
-static int yaffs_removexattr(struct dentry *dentry, const char *name)
-{
- struct inode *inode = dentry->d_inode;
- int error = 0;
- struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_removexattr of object %d", obj->obj_id);
-
- if (error == 0) {
- int result;
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- result = yaffs_remove_xattrib(obj, name);
- if (result == YAFFS_OK)
- error = 0;
- else if (result < 0)
- error = result;
- yaffs_gross_unlock(dev);
-
- }
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_removexattr done returning %d", error);
-
- return error;
-}
-
-static ssize_t yaffs_listxattr(struct dentry * dentry, char *buff, size_t size)
-{
- struct inode *inode = dentry->d_inode;
- int error = 0;
- struct yaffs_dev *dev;
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_listxattr of object %d", obj->obj_id);
-
- if (error == 0) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- error = yaffs_list_xattrib(obj, buff, size);
- yaffs_gross_unlock(dev);
-
- }
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_listxattr done returning %d", error);
-
- return error;
-}
-
-
-static const struct inode_operations yaffs_file_inode_operations = {
- .setattr = yaffs_setattr,
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-};
-
-
-static int yaffs_readlink(struct dentry *dentry, char __user * buffer,
- int buflen)
-{
- unsigned char *alias;
- int ret;
-
- struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
-
- yaffs_gross_lock(dev);
-
- alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
-
- yaffs_gross_unlock(dev);
-
- if (!alias)
- return -ENOMEM;
-
-#if LINUX_VERSION_CODE < KERNEL_VERSION(3, 15, 0)
- ret = vfs_readlink(dentry, buffer, buflen, alias);
-#else
- ret = readlink_copy(buffer, buflen, alias);
-#endif
- kfree(alias);
- return ret;
-}
-
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
-static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
- void *ret;
-#else
-static int yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-{
- int ret
-#endif
- unsigned char *alias;
- int ret_int = 0;
- struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
-
- yaffs_gross_lock(dev);
-
- alias = yaffs_get_symlink_alias(yaffs_dentry_to_obj(dentry));
- yaffs_gross_unlock(dev);
-
- if (!alias) {
- ret_int = -ENOMEM;
- goto out;
- }
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
- nd_set_link(nd, alias);
- ret = alias;
-out:
- if (ret_int)
- ret = ERR_PTR(ret_int);
- return ret;
-#else
- ret = vfs_follow_link(nd, alias);
- kfree(alias);
-out:
- if (ret_int)
- ret = ret_int;
- return ret;
-#endif
-}
-
-
-#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)
-{
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_put_inode: ino %d, count %d"),
- (int)inode->i_ino, atomic_read(&inode->i_count);
-
-}
-#endif
-
-#if (YAFFS_NEW_FOLLOW_LINK == 1)
-void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
-{
- kfree(alias);
-}
-#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,
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-};
-
-#ifdef YAFFS_USE_OWN_IGET
-
-static struct inode *yaffs_iget(struct super_block *sb, unsigned long ino)
-{
- struct inode *inode;
- struct yaffs_obj *obj;
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_iget for %lu", 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_gross_lock(dev);
-
- obj = yaffs_find_by_number(dev, inode->i_ino);
-
- yaffs_fill_inode_from_obj(inode, obj);
-
- yaffs_gross_unlock(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.
- */
-
- struct yaffs_obj *obj;
- struct yaffs_dev *dev = yaffs_super_to_dev(inode->i_sb);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_read_inode for %d", (int)inode->i_ino);
-
- if (current != yaffs_dev_to_lc(dev)->readdir_process)
- yaffs_gross_lock(dev);
-
- obj = yaffs_find_by_number(dev, inode->i_ino);
-
- yaffs_fill_inode_from_obj(inode, obj);
-
- if (current != yaffs_dev_to_lc(dev)->readdir_process)
- yaffs_gross_unlock(dev);
-}
-
-#endif
-
-
-
-struct inode *yaffs_get_inode(struct super_block *sb, int mode, int dev,
- struct yaffs_obj *obj)
-{
- struct inode *inode;
-
- if (!sb) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_get_inode for NULL super_block!!");
- return NULL;
-
- }
-
- if (!obj) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_get_inode for NULL object!!");
- return NULL;
-
- }
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_get_inode for object %d", obj->obj_id);
-
- inode = Y_IGET(sb, obj->obj_id);
- 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 gross_lock or deadlock will happen! */
-
- return inode;
-}
-
-
-
-#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(3,14,0)
-#define YPROC_uid(p) (YCRED(p)->fsuid)
-#define YPROC_gid(p) (YCRED(p)->fsgid)
-#define EXTRACT_gid(x) x
-#define EXTRACT_uid(x) x
-#define MAKE_gid(x) x
-#define MAKE_uid(x) x
-#else
-#define YPROC_uid(p) from_kuid(&init_user_ns, YCRED(p)->fsuid)
-#define YPROC_gid(p) from_kgid(&init_user_ns, YCRED(p)->fsgid)
-#define EXTRACT_gid(x) from_kgid(&init_user_ns, x)
-#define EXTRACT_uid(x) from_kuid(&init_user_ns, x)
-#define MAKE_gid(x) make_kgid(&init_user_ns, x)
-#define MAKE_uid(x) make_kuid(&init_user_ns, x)
-#endif
-
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
-static int yaffs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode,
- dev_t rdev)
-#elif (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;
-
- struct yaffs_obj *obj = NULL;
- struct yaffs_dev *dev;
-
- struct yaffs_obj *parent = yaffs_inode_to_obj(dir);
-
- int error = -ENOSPC;
- uid_t uid = YPROC_uid(current);
- gid_t gid =
- (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
-
- if ((dir->i_mode & S_ISGID) && S_ISDIR(mode))
- mode |= S_ISGID;
-
- if (parent) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_mknod: parent object %d type %d",
- parent->obj_id, parent->variant_type);
- } else {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_mknod: could not get parent object");
- return -EPERM;
- }
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_mknod: making oject for %s, mode %x dev %x",
- dentry->d_name.name, mode, rdev);
-
- dev = parent->my_dev;
-
- yaffs_gross_lock(dev);
-
- switch (mode & S_IFMT) {
- default:
- /* Special (socket, fifo, device...) */
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making special");
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
- obj =
- yaffs_create_special(parent, dentry->d_name.name, mode, uid,
- gid, old_encode_dev(rdev));
-#else
- obj =
- yaffs_create_special(parent, dentry->d_name.name, mode, uid,
- gid, rdev);
-#endif
- break;
- case S_IFREG: /* file */
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making file");
- obj = yaffs_create_file(parent, dentry->d_name.name, mode, uid,
- gid);
- break;
- case S_IFDIR: /* directory */
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making directory");
- obj = yaffs_create_dir(parent, dentry->d_name.name, mode,
- uid, gid);
- break;
- case S_IFLNK: /* symlink */
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod: making symlink");
- obj = NULL; /* Do we ever get here? */
- break;
- }
-
- /* Can not call yaffs_get_inode() with gross lock held */
- yaffs_gross_unlock(dev);
-
- if (obj) {
- inode = yaffs_get_inode(dir->i_sb, mode, rdev, obj);
- d_instantiate(dentry, inode);
- update_dir_time(dir);
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_mknod created object %d count = %d",
- obj->obj_id, atomic_read(&inode->i_count));
- error = 0;
- yaffs_fill_inode_from_obj(dir, parent);
- } else {
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_mknod failed making object");
- error = -ENOMEM;
- }
-
- return error;
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
-#else
-static int yaffs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
-#endif
-{
- int ret_val;
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_mkdir");
- ret_val = yaffs_mknod(dir, dentry, mode | S_IFDIR, 0);
- return ret_val;
-}
-
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- bool dummy)
-#elif (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 4, 0))
-static int yaffs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
- struct nameidata *n)
-#elif (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
-{
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_create");
- return yaffs_mknod(dir, dentry, mode | S_IFREG, 0);
-}
-
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 6, 0))
-static struct dentry *yaffs_lookup(struct inode *dir, struct dentry *dentry,
- unsigned int dummy)
-#elif (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
-{
- struct yaffs_obj *obj;
- struct inode *inode = NULL; /* NCB 2.5/2.6 needs NULL here */
-
- struct yaffs_dev *dev = yaffs_inode_to_obj(dir)->my_dev;
-
- if (current != yaffs_dev_to_lc(dev)->readdir_process)
- yaffs_gross_lock(dev);
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup for %d:%s",
- yaffs_inode_to_obj(dir)->obj_id, dentry->d_name.name);
-
- obj = yaffs_find_by_name(yaffs_inode_to_obj(dir), dentry->d_name.name);
-
- obj = yaffs_get_equivalent_obj(obj); /* in case it was a hardlink */
-
- /* Can't hold gross lock when calling yaffs_get_inode() */
- if (current != yaffs_dev_to_lc(dev)->readdir_process)
- yaffs_gross_unlock(dev);
-
- if (obj) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_lookup found %d", obj->obj_id);
-
- inode = yaffs_get_inode(dir->i_sb, obj->yst_mode, 0, obj);
- } else {
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_lookup not found");
-
- }
-
-/* added NCB for 2.5/6 compatability - forces add even if inode is
- * NULL which creates dentry hash */
- d_add(dentry, inode);
-
- return NULL;
-}
-
-/*
- * Create a link...
- */
-static int yaffs_link(struct dentry *old_dentry, struct inode *dir,
- struct dentry *dentry)
-{
- struct inode *inode = old_dentry->d_inode;
- struct yaffs_obj *obj = NULL;
- struct yaffs_obj *link = NULL;
- struct yaffs_dev *dev;
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_link");
-
- obj = yaffs_inode_to_obj(inode);
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- if (!S_ISDIR(inode->i_mode)) /* Don't link directories */
- link =
- yaffs_link_obj(yaffs_inode_to_obj(dir), dentry->d_name.name,
- obj);
-
- if (link) {
- set_nlink(old_dentry->d_inode, yaffs_get_obj_link_count(obj));
- d_instantiate(dentry, old_dentry->d_inode);
- atomic_inc(&old_dentry->d_inode->i_count);
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_link link count %d i_count %d",
- old_dentry->d_inode->i_nlink,
- atomic_read(&old_dentry->d_inode->i_count));
- }
-
- yaffs_gross_unlock(dev);
-
- if (link) {
- update_dir_time(dir);
- return 0;
- }
-
- return -EPERM;
-}
-
-static int yaffs_symlink(struct inode *dir, struct dentry *dentry,
- const char *symname)
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
- uid_t uid = YPROC_uid(current);
- gid_t gid =
- (dir->i_mode & S_ISGID) ? EXTRACT_gid(dir->i_gid) : YPROC_gid(current);
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_symlink");
-
- if (strnlen(dentry->d_name.name, YAFFS_MAX_NAME_LENGTH + 1) >
- YAFFS_MAX_NAME_LENGTH)
- return -ENAMETOOLONG;
-
- if (strnlen(symname, YAFFS_MAX_ALIAS_LENGTH + 1) >
- YAFFS_MAX_ALIAS_LENGTH)
- return -ENAMETOOLONG;
-
- dev = yaffs_inode_to_obj(dir)->my_dev;
- yaffs_gross_lock(dev);
- obj = yaffs_create_symlink(yaffs_inode_to_obj(dir), dentry->d_name.name,
- S_IFLNK | S_IRWXUGO, uid, gid, symname);
- yaffs_gross_unlock(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);
- yaffs_trace(YAFFS_TRACE_OS, "symlink created OK");
- return 0;
- } else {
- yaffs_trace(YAFFS_TRACE_OS, "symlink not created");
- }
-
- return -ENOMEM;
-}
-
-/*
- * 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)
-{
- struct yaffs_dev *dev;
- int ret_val = YAFFS_FAIL;
- struct yaffs_obj *target;
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_rename");
- dev = yaffs_inode_to_obj(old_dir)->my_dev;
-
- yaffs_gross_lock(dev);
-
- /* Check if the target is an existing directory that is not empty. */
- target = yaffs_find_by_name(yaffs_inode_to_obj(new_dir),
- new_dentry->d_name.name);
-
- if (target && target->variant_type == YAFFS_OBJECT_TYPE_DIRECTORY &&
- !list_empty(&target->variant.dir_variant.children)) {
-
- yaffs_trace(YAFFS_TRACE_OS, "target is non-empty dir");
-
- ret_val = YAFFS_FAIL;
- } else {
- /* Now does unlinking internally using shadowing mechanism */
- yaffs_trace(YAFFS_TRACE_OS, "calling yaffs_rename_obj");
-
- ret_val = yaffs_rename_obj(yaffs_inode_to_obj(old_dir),
- old_dentry->d_name.name,
- yaffs_inode_to_obj(new_dir),
- new_dentry->d_name.name);
- }
- yaffs_gross_unlock(dev);
-
- if (ret_val == YAFFS_OK) {
- if (target)
- inode_dec_link_count(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_unlink(struct inode *dir, struct dentry *dentry)
-{
- int ret_val;
-
- struct yaffs_dev *dev;
- struct yaffs_obj *obj;
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_unlink %d:%s",
- (int)(dir->i_ino), dentry->d_name.name);
- obj = yaffs_inode_to_obj(dir);
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- ret_val = yaffs_unlinker(obj, dentry->d_name.name);
-
- if (ret_val == YAFFS_OK) {
- inode_dec_link_count(dentry->d_inode);
- dir->i_version++;
- yaffs_gross_unlock(dev);
- update_dir_time(dir);
- return 0;
- }
- yaffs_gross_unlock(dev);
- return -ENOTEMPTY;
-}
-
-
-
-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,
- .setxattr = yaffs_setxattr,
- .getxattr = yaffs_getxattr,
- .listxattr = yaffs_listxattr,
- .removexattr = yaffs_removexattr,
-};
-
-/*-----------------------------------------------------------------*/
-/* 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 remove_obj_fn 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 struct yaffs_dev 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_search_context {
- struct yaffs_dev *dev;
- struct yaffs_obj *dir_obj;
- struct yaffs_obj *next_return;
- struct list_head others;
-};
-
-/*
- * yaffs_new_search() 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_search_context *yaffs_new_search(struct yaffs_obj *dir)
-{
- struct yaffs_dev *dev = dir->my_dev;
- struct yaffs_search_context *sc =
- kmalloc(sizeof(struct yaffs_search_context), GFP_NOFS);
- if (sc) {
- sc->dir_obj = dir;
- sc->dev = dev;
- if (list_empty(&sc->dir_obj->variant.dir_variant.children))
- sc->next_return = NULL;
- else
- sc->next_return =
- list_entry(dir->variant.dir_variant.children.next,
- struct yaffs_obj, siblings);
- INIT_LIST_HEAD(&sc->others);
- list_add(&sc->others, &(yaffs_dev_to_lc(dev)->search_contexts));
- }
- return sc;
-}
-
-/*
- * yaffs_search_end() disposes of a search context and cleans up.
- */
-static void yaffs_search_end(struct yaffs_search_context *sc)
-{
- if (sc) {
- list_del(&sc->others);
- kfree(sc);
- }
-}
-
-/*
- * yaffs_search_advance() 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_search_advance(struct yaffs_search_context *sc)
-{
- if (!sc)
- return;
-
- if (sc->next_return == NULL ||
- list_empty(&sc->dir_obj->variant.dir_variant.children))
- sc->next_return = NULL;
- else {
- struct list_head *next = sc->next_return->siblings.next;
-
- if (next == &sc->dir_obj->variant.dir_variant.children)
- sc->next_return = NULL; /* end of list */
- else
- sc->next_return =
- list_entry(next, struct yaffs_obj, siblings);
- }
-}
-
-/*
- * yaffs_remove_obj_callback() 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_remove_obj_callback(struct yaffs_obj *obj)
-{
-
- struct list_head *i;
- struct yaffs_search_context *sc;
- struct list_head *search_contexts =
- &(yaffs_dev_to_lc(obj->my_dev)->search_contexts);
-
- /* 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.
- */
- list_for_each(i, search_contexts) {
- sc = list_entry(i, struct yaffs_search_context, others);
- if (sc->next_return == obj)
- yaffs_search_advance(sc);
- }
-
-}
-
-
-/*-----------------------------------------------------------------*/
-
-#ifdef YAFFS_USE_DIR_ITERATE
-static int yaffs_iterate(struct file *f, struct dir_context *dc)
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
- struct yaffs_search_context *sc;
- unsigned long curoffs;
- struct yaffs_obj *l;
- int ret_val = 0;
-
- char name[YAFFS_MAX_NAME_LENGTH + 1];
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- yaffs_dev_to_lc(dev)->readdir_process = current;
-
- sc = yaffs_new_search(obj);
- if (!sc) {
- ret_val = -ENOMEM;
- goto out;
- }
-
- if (!dir_emit_dots(f, dc))
- return 0;
-
- curoffs = 1;
-
- while (sc->next_return) {
- curoffs++;
- l = sc->next_return;
- if (curoffs >= dc->pos) {
- int this_inode = yaffs_get_obj_inode(l);
- int this_type = yaffs_get_obj_type(l);
-
- yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readdir: %s inode %d",
- name, yaffs_get_obj_inode(l));
-
- yaffs_gross_unlock(dev);
-
- if (!dir_emit(dc,
- name,
- strlen(name),
- this_inode,
- this_type)) {
- yaffs_gross_lock(dev);
- goto out;
- }
-
- yaffs_gross_lock(dev);
-
- dc->pos++;
- f->f_pos++;
- }
- yaffs_search_advance(sc);
- }
-
-out:
- yaffs_search_end(sc);
- yaffs_dev_to_lc(dev)->readdir_process = NULL;
- yaffs_gross_unlock(dev);
-
- return ret_val;
-}
-
-#else
-
-static int yaffs_readdir(struct file *f, void *dirent, filldir_t filldir)
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
- struct yaffs_search_context *sc;
- struct inode *inode = f->f_dentry->d_inode;
- unsigned long offset, curoffs;
- struct yaffs_obj *l;
- int ret_val = 0;
-
- char name[YAFFS_MAX_NAME_LENGTH + 1];
-
- obj = yaffs_dentry_to_obj(f->f_dentry);
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-
- yaffs_dev_to_lc(dev)->readdir_process = current;
-
- offset = f->f_pos;
-
- sc = yaffs_new_search(obj);
- if (!sc) {
- ret_val = -ENOMEM;
- goto out;
- }
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readdir: starting at %d", (int)offset);
-
- if (offset == 0) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readdir: entry . ino %d",
- (int)inode->i_ino);
- yaffs_gross_unlock(dev);
- if (filldir(dirent, ".", 1, offset, inode->i_ino, DT_DIR) < 0) {
- yaffs_gross_lock(dev);
- goto out;
- }
- yaffs_gross_lock(dev);
- offset++;
- f->f_pos++;
- }
- if (offset == 1) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readdir: entry .. ino %d",
- (int)f->f_dentry->d_parent->d_inode->i_ino);
- yaffs_gross_unlock(dev);
- if (filldir(dirent, "..", 2, offset,
- f->f_dentry->d_parent->d_inode->i_ino,
- DT_DIR) < 0) {
- yaffs_gross_lock(dev);
- goto out;
- }
- yaffs_gross_lock(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->next_return) {
- curoffs++;
- l = sc->next_return;
- if (curoffs >= offset) {
- int this_inode = yaffs_get_obj_inode(l);
- int this_type = yaffs_get_obj_type(l);
-
- yaffs_get_obj_name(l, name, YAFFS_MAX_NAME_LENGTH + 1);
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readdir: %s inode %d",
- name, yaffs_get_obj_inode(l));
-
- yaffs_gross_unlock(dev);
-
- if (filldir(dirent,
- name,
- strlen(name),
- offset, this_inode, this_type) < 0) {
- yaffs_gross_lock(dev);
- goto out;
- }
-
- yaffs_gross_lock(dev);
-
- offset++;
- f->f_pos++;
- }
- yaffs_search_advance(sc);
- }
-
-out:
- yaffs_search_end(sc);
- yaffs_dev_to_lc(dev)->readdir_process = NULL;
- yaffs_gross_unlock(dev);
-
- return ret_val;
-}
-
-#endif
-
-static const struct file_operations yaffs_dir_operations = {
- .read = generic_read_dir,
-#ifdef YAFFS_USE_DIR_ITERATE
- .iterate = yaffs_iterate,
-#else
- .readdir = yaffs_readdir,
-#endif
- .fsync = yaffs_sync_object,
- .llseek = generic_file_llseek,
-};
-
-static void yaffs_fill_inode_from_obj(struct inode *inode,
- struct yaffs_obj *obj)
-{
- if (inode && obj) {
-
- /* Check mode against the variant type and attempt to repair if broken. */
- u32 mode = obj->yst_mode;
- switch (obj->variant_type) {
- 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->obj_id;
- inode->i_mode = obj->yst_mode;
- inode->i_uid = MAKE_uid(obj->yst_uid);
- inode->i_gid = MAKE_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_get_obj_length(obj);
- inode->i_blocks = (inode->i_size + 511) >> 9;
-
- set_nlink(inode, yaffs_get_obj_link_count(obj));
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_fill_inode mode %x uid %d gid %d size %lld count %d",
- inode->i_mode, obj->yst_uid, obj->yst_gid,
- 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_inode_to_obj_lv(inode) = obj;
-
- obj->my_inode = inode;
-
- } else {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_fill_inode invalid parameters");
- }
-
-}
-
-
-
-/*
- * yaffs background thread functions .
- * yaffs_bg_thread_fn() the thread function
- * yaffs_bg_start() launches the background thread.
- * yaffs_bg_stop() 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.
- */
-
-static unsigned yaffs_bg_gc_urgency(struct yaffs_dev *dev)
-{
- unsigned erased_chunks =
- dev->n_erased_blocks * dev->param.chunks_per_block;
- struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
- unsigned scattered = 0; /* Free chunks not in an erased block */
-
- if (erased_chunks < dev->n_free_chunks)
- scattered = (dev->n_free_chunks - erased_chunks);
-
- if (!context->bg_running)
- return 0;
- else if (scattered < (dev->param.chunks_per_block * 2))
- return 0;
- else if (erased_chunks > dev->n_free_chunks / 2)
- return 0;
- else if (erased_chunks > dev->n_free_chunks / 4)
- return 1;
- else
- return 2;
-}
-
-#ifdef YAFFS_COMPILE_BACKGROUND
-
-void yaffs_background_waker(unsigned long data)
-{
- wake_up_process((struct task_struct *)data);
-}
-
-static int yaffs_bg_thread_fn(void *data)
-{
- struct yaffs_dev *dev = (struct yaffs_dev *)data;
- struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
- unsigned long now = jiffies;
- unsigned long next_dir_update = now;
- unsigned long next_gc = now;
- unsigned long expires;
- unsigned int urgency;
-
- int gc_result;
- struct timer_list timer;
-
- yaffs_trace(YAFFS_TRACE_BACKGROUND,
- "yaffs_background starting for dev %p", (void *)dev);
-
-#ifdef YAFFS_COMPILE_FREEZER
- set_freezable();
-#endif
- while (context->bg_running) {
- yaffs_trace(YAFFS_TRACE_BACKGROUND, "yaffs_background");
-
- if (kthread_should_stop())
- break;
-
-#ifdef YAFFS_COMPILE_FREEZER
- if (try_to_freeze())
- continue;
-#endif
- yaffs_gross_lock(dev);
-
- now = jiffies;
-
- if (time_after(now, next_dir_update) && yaffs_bg_enable) {
- yaffs_update_dirty_dirs(dev);
- next_dir_update = now + HZ;
- }
-
- if (time_after(now, next_gc) && yaffs_bg_enable) {
- if (!dev->is_checkpointed) {
- urgency = yaffs_bg_gc_urgency(dev);
- gc_result = yaffs_bg_gc(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_gross_unlock(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_bg_start(struct yaffs_dev *dev)
-{
- int retval = 0;
- struct yaffs_linux_context *context = yaffs_dev_to_lc(dev);
-
- if (dev->read_only)
- return -1;
-
- context->bg_running = 1;
-
- context->bg_thread = kthread_run(yaffs_bg_thread_fn,
- (void *)dev, "yaffs-bg-%d",
- context->mount_id);
-
- if (IS_ERR(context->bg_thread)) {
- retval = PTR_ERR(context->bg_thread);
- context->bg_thread = NULL;
- context->bg_running = 0;
- }
- return retval;
-}
-
-static void yaffs_bg_stop(struct yaffs_dev *dev)
-{
- struct yaffs_linux_context *ctxt = yaffs_dev_to_lc(dev);
-
- ctxt->bg_running = 0;
-
- if (ctxt->bg_thread) {
- kthread_stop(ctxt->bg_thread);
- ctxt->bg_thread = NULL;
- }
-}
-#else
-static int yaffs_bg_thread_fn(void *data)
-{
- return 0;
-}
-
-static int yaffs_bg_start(struct yaffs_dev *dev)
-{
- return 0;
-}
-
-static void yaffs_bg_stop(struct yaffs_dev *dev)
-{
-}
-#endif
-
-
-static void yaffs_flush_inodes(struct super_block *sb)
-{
- struct inode *iptr;
- struct yaffs_obj *obj;
-
- list_for_each_entry(iptr, &sb->s_inodes, i_sb_list) {
- obj = yaffs_inode_to_obj(iptr);
- if (obj) {
- yaffs_trace(YAFFS_TRACE_OS,
- "flushing obj %d",
- obj->obj_id);
- yaffs_flush_file(obj, 1, 0, 0);
- }
- }
-}
-
-static void yaffs_flush_super(struct super_block *sb, int do_checkpoint)
-{
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
- if (!dev)
- return;
-
- yaffs_flush_inodes(sb);
- yaffs_update_dirty_dirs(dev);
- yaffs_flush_whole_cache(dev, 1);
- if (do_checkpoint)
- yaffs_checkpoint_save(dev);
-}
-
-static LIST_HEAD(yaffs_context_list);
-struct mutex yaffs_context_lock;
-
-static void yaffs_put_super(struct super_block *sb)
-{
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
- struct mtd_info *mtd = yaffs_dev_to_mtd(dev);
-
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
- "yaffs_put_super");
-
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
- "Shutting down yaffs background thread");
- yaffs_bg_stop(dev);
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_BACKGROUND,
- "yaffs background thread shut down");
-
- yaffs_gross_lock(dev);
-
- yaffs_flush_super(sb, 1);
-
- yaffs_deinitialise(dev);
-
- yaffs_gross_unlock(dev);
-
- mutex_lock(&yaffs_context_lock);
- list_del_init(&(yaffs_dev_to_lc(dev)->context_list));
- mutex_unlock(&yaffs_context_lock);
-
- if (yaffs_dev_to_lc(dev)->spare_buffer) {
- kfree(yaffs_dev_to_lc(dev)->spare_buffer);
- yaffs_dev_to_lc(dev)->spare_buffer = NULL;
- }
-
- kfree(dev);
-
- yaffs_put_mtd_device(mtd);
-
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_ALWAYS,
- "yaffs_put_super done");
-}
-
-
-static unsigned yaffs_gc_control_callback(struct yaffs_dev *dev)
-{
- return yaffs_gc_control;
-}
-
-
-#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;
- struct yaffs_obj *d_obj;
- struct yaffs_obj *parent_obj;
-
- d_obj = yaffs_inode_to_obj(dentry->d_inode);
-
- if (d_obj) {
- parent_obj = d_obj->parent;
- if (parent_obj) {
- parent_ino = yaffs_get_obj_inode(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
-
-static void yaffs_unstitch_obj(struct inode *inode, struct yaffs_obj *obj)
-{
- /* Clear the association between the inode and
- * the struct yaffs_obj.
- */
- obj->my_inode = NULL;
- yaffs_inode_to_obj_lv(inode) = NULL;
-
- /* If the object freeing was deferred, then the real
- * free happens now.
- * This should fix the inode inconsistency problem.
- */
- yaffs_handle_defered_free(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)
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
- int deleteme = 0;
-
- obj = yaffs_inode_to_obj(inode);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_evict_inode: ino %d, count %d %s",
- (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);
- Y_CLEAR_INODE(inode);
-
- if (deleteme && obj) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- yaffs_del_obj(obj);
- yaffs_gross_unlock(dev);
- }
- if (obj) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- yaffs_unstitch_obj(inode, obj);
- yaffs_gross_unlock(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)
-{
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
-
- obj = yaffs_inode_to_obj(inode);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_clear_inode: ino %d, count %d %s",
- (int)inode->i_ino, atomic_read(&inode->i_count),
- obj ? "object exists" : "null object");
-
- if (obj) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- yaffs_unstitch_obj(inode, obj);
- yaffs_gross_unlock(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)
-{
- struct yaffs_obj *obj = yaffs_inode_to_obj(inode);
- struct yaffs_dev *dev;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_delete_inode: ino %d, count %d %s",
- (int)inode->i_ino, atomic_read(&inode->i_count),
- obj ? "object exists" : "null object");
-
- if (obj) {
- dev = obj->my_dev;
- yaffs_gross_lock(dev);
- yaffs_del_obj(obj);
- yaffs_gross_unlock(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_statfs(struct dentry *dentry, struct kstatfs *buf)
-{
- struct yaffs_dev *dev = yaffs_dentry_to_obj(dentry)->my_dev;
- 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)
-{
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-#else
-static int yaffs_statfs(struct super_block *sb, struct statfs *buf)
-{
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
-#endif
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_statfs");
-
- yaffs_gross_lock(dev);
-
- buf->f_type = YAFFS_MAGIC;
- buf->f_bsize = sb->s_blocksize;
- buf->f_namelen = 255;
-
- if (dev->data_bytes_per_chunk & (dev->data_bytes_per_chunk - 1)) {
- /* Do this if chunk size is not a power of 2 */
-
- uint64_t bytes_in_dev;
- uint64_t bytes_free;
-
- bytes_in_dev =
- ((uint64_t)
- ((dev->param.end_block - dev->param.start_block +
- 1))) * ((uint64_t) (dev->param.chunks_per_block *
- dev->data_bytes_per_chunk));
-
- do_div(bytes_in_dev, sb->s_blocksize); /* bytes_in_dev becomes the number of blocks */
- buf->f_blocks = bytes_in_dev;
-
- bytes_free = ((uint64_t) (yaffs_get_n_free_chunks(dev))) *
- ((uint64_t) (dev->data_bytes_per_chunk));
-
- do_div(bytes_free, sb->s_blocksize);
-
- buf->f_bfree = bytes_free;
-
- } else if (sb->s_blocksize > dev->data_bytes_per_chunk) {
-
- buf->f_blocks =
- (dev->param.end_block - dev->param.start_block + 1) *
- dev->param.chunks_per_block /
- (sb->s_blocksize / dev->data_bytes_per_chunk);
- buf->f_bfree =
- yaffs_get_n_free_chunks(dev) /
- (sb->s_blocksize / dev->data_bytes_per_chunk);
- } else {
- buf->f_blocks =
- (dev->param.end_block - dev->param.start_block + 1) *
- dev->param.chunks_per_block *
- (dev->data_bytes_per_chunk / sb->s_blocksize);
-
- buf->f_bfree =
- yaffs_get_n_free_chunks(dev) *
- (dev->data_bytes_per_chunk / sb->s_blocksize);
- }
-
- buf->f_files = 0;
- buf->f_ffree = 0;
- buf->f_bavail = buf->f_bfree;
-
- yaffs_gross_unlock(dev);
- return 0;
-}
-
-
-
-static int yaffs_do_sync_fs(struct super_block *sb, int request_checkpoint)
-{
-
- struct yaffs_dev *dev = yaffs_super_to_dev(sb);
- unsigned int oneshot_checkpoint = (yaffs_auto_checkpoint & 4);
- unsigned gc_urgent = yaffs_bg_gc_urgency(dev);
- int do_checkpoint;
- int dirty = yaffs_check_super_dirty(dev);
-
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
- "yaffs_do_sync_fs: gc-urgency %d %s %s%s",
- gc_urgent,
- dirty ? "dirty" : "clean",
- request_checkpoint ? "checkpoint requested" : "no checkpoint",
- oneshot_checkpoint ? " one-shot" : "");
-
- yaffs_gross_lock(dev);
- do_checkpoint = ((request_checkpoint && !gc_urgent) ||
- oneshot_checkpoint) && !dev->is_checkpointed;
-
- if (dirty || do_checkpoint) {
- yaffs_flush_super(sb, !dev->is_checkpointed && do_checkpoint);
- yaffs_clear_super_dirty(dev);
- if (oneshot_checkpoint)
- yaffs_auto_checkpoint &= ~4;
- }
- yaffs_gross_unlock(dev);
-
- return 0;
-}
-
-
-#ifdef YAFFS_HAS_WRITE_SUPER
-#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);
-
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC | YAFFS_TRACE_BACKGROUND,
- "yaffs_write_super %s",
- request_checkpoint ? " checkpt" : "");
-
- yaffs_do_sync_fs(sb, request_checkpoint);
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 18))
- return 0;
-#endif
-}
-#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);
-
- yaffs_trace(YAFFS_TRACE_OS | YAFFS_TRACE_SYNC,
- "yaffs_sync_fs%s", request_checkpoint ? " checkpt" : "");
-
- yaffs_do_sync_fs(sb, request_checkpoint);
-
- return 0;
-}
-
-/* the function only is used to change dev->read_only when this file system
- * is remounted.
- */
-static int yaffs_remount_fs(struct super_block *sb, int *flags, char *data)
-{
- int read_only = 0;
- struct mtd_info *mtd;
- struct yaffs_dev *dev = 0;
-
- /* Get the device */
- mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
- if (!mtd) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "MTD device #%u doesn't appear to exist",
- MINOR(sb->s_dev));
- return 1;
- }
-
- /* Check it's NAND */
- if (mtd->type != MTD_NANDFLASH && mtd->type != MTD_MLCNANDFLASH) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "MTD device is not NAND it's type %d",
- mtd->type);
- return 1;
- }
-
- read_only = ((*flags & MS_RDONLY) != 0);
- if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
- read_only = 1;
- printk(KERN_INFO
- "yaffs: mtd is read only, setting superblock read only");
- *flags |= MS_RDONLY;
- }
-
- dev = sb->s_fs_info;
- dev->read_only = read_only;
-
- return 0;
-}
-
-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,
-#ifdef YAFFS_HAS_WRITE_SUPER
- .write_super = yaffs_write_super,
-#endif
- .remount_fs = yaffs_remount_fs,
-};
-
-struct yaffs_options {
- 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;
- int disable_summary;
-};
-
-#define MAX_OPT_LEN 30
-static int yaffs_parse_options(struct 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, "disable-summary")) {
- options->disable_summary = 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 dentry *yaffs_make_root(struct inode *inode)
-{
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 4, 0))
- struct dentry *root = d_alloc_root(inode);
-
- if (!root)
- iput(inode);
-
- return root;
-#else
- return d_make_root(inode);
-#endif
-}
-
-
-
-
-static struct super_block *yaffs_internal_read_super(int yaffs_version,
- struct super_block *sb,
- void *data, int silent)
-{
- int n_blocks;
- struct inode *inode = NULL;
- struct dentry *root;
- struct yaffs_dev *dev = 0;
- char devname_buf[BDEVNAME_SIZE + 1];
- struct mtd_info *mtd;
- int err;
- char *data_str = (char *)data;
- struct yaffs_linux_context *context = NULL;
- struct yaffs_param *param;
-
- int read_only = 0;
- int inband_tags = 0;
-
- struct yaffs_options options;
-
- unsigned mount_id;
- int found;
- struct yaffs_linux_context *context_iterator;
- struct list_head *l;
-
- if (!sb) {
- printk(KERN_INFO "yaffs: sb is NULL\n");
- return NULL;
- }
-
- sb->s_magic = YAFFS_MAGIC;
- sb->s_op = &yaffs_super_ops;
- sb->s_flags |= MS_NOATIME;
-
- read_only = ((sb->s_flags & MS_RDONLY) != 0);
-
-#ifdef YAFFS_COMPILE_EXPORTFS
- sb->s_export_op = &yaffs_export_ops;
-#endif
-
- 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), read_only ? "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;
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_read_super: Using yaffs%d", yaffs_version);
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_read_super: block size %d", (int)(sb->s_blocksize));
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: Attempting MTD mount of %u.%u,\"%s\"",
- MAJOR(sb->s_dev), MINOR(sb->s_dev),
- yaffs_devname(sb, devname_buf));
-
- /* Get the device */
- mtd = get_mtd_device(NULL, MINOR(sb->s_dev));
- if (IS_ERR(mtd)) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs: MTD device %u either not valid or unavailable",
- MINOR(sb->s_dev));
- return NULL;
- }
-
- if (yaffs_auto_select && yaffs_version == 1 && WRITE_SIZE(mtd) >= 2048) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs2");
- yaffs_version = 2;
- }
-
- /* Added NCB 26/5/2006 for completeness */
- if (yaffs_version == 2 && !options.inband_tags
- && WRITE_SIZE(mtd) == 512) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
- yaffs_version = 1;
- }
-
- if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
- options.inband_tags)
- inband_tags = 1;
-
- if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
- 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 struct yaffs_dev up for mtd
- */
-
- if (!read_only && !(mtd->flags & MTD_WRITEABLE)) {
- read_only = 1;
- printk(KERN_INFO
- "yaffs: mtd is read only, setting superblock read only\n"
- );
- sb->s_flags |= MS_RDONLY;
- }
-
- dev = kmalloc(sizeof(struct yaffs_dev), GFP_KERNEL);
- context = kmalloc(sizeof(struct yaffs_linux_context), GFP_KERNEL);
-
- if (!dev || !context) {
- kfree(dev);
- kfree(context);
- dev = NULL;
- context = NULL;
-
- /* Deep shit could not allocate device structure */
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs_read_super: Failed trying to allocate struct yaffs_dev."
- );
- return NULL;
- }
- memset(dev, 0, sizeof(struct yaffs_dev));
- param = &(dev->param);
-
- memset(context, 0, sizeof(struct yaffs_linux_context));
- dev->os_context = context;
- INIT_LIST_HEAD(&(context->context_list));
- context->dev = dev;
- context->super = sb;
-
- dev->read_only = read_only;
-
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 5, 0))
- sb->s_fs_info = dev;
-#else
- sb->u.generic_sbp = dev;
-#endif
-
-
- dev->driver_context = mtd;
- param->name = mtd->name;
-
- /* Set up the memory size parameters.... */
-
-
- param->n_reserved_blocks = 5;
- param->n_caches = (options.no_cache) ? 0 : 10;
- param->inband_tags = inband_tags;
-
- param->enable_xattr = 1;
- if (options.lazy_loading_overridden)
- param->disable_lazy_load = !options.lazy_loading_enabled;
-
- param->defered_dir_update = 1;
-
- if (options.tags_ecc_overridden)
- param->no_tags_ecc = !options.tags_ecc_on;
-
- param->empty_lost_n_found = 1;
- param->refresh_period = 500;
- param->disable_summary = options.disable_summary;
-
-
-#ifdef CONFIG_YAFFS_DISABLE_BAD_BLOCK_MARKING
- param->disable_bad_block_marking = 1;
-#endif
- if (options.empty_lost_and_found_overridden)
- param->empty_lost_n_found = options.empty_lost_and_found;
-
- /* ... and the functions. */
- if (yaffs_version == 2) {
- param->is_yaffs2 = 1;
-#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 17))
- param->total_bytes_per_chunk = mtd->writesize;
- param->chunks_per_block = mtd->erasesize / mtd->writesize;
-#else
- param->total_bytes_per_chunk = mtd->oobblock;
- param->chunks_per_block = mtd->erasesize / mtd->oobblock;
-#endif
- n_blocks = YCALCBLOCKS(mtd->size, mtd->erasesize);
-
- param->start_block = 0;
- param->end_block = n_blocks - 1;
- } else {
- param->is_yaffs2 = 0;
- n_blocks = YCALCBLOCKS(mtd->size,
- YAFFS_CHUNKS_PER_BLOCK * YAFFS_BYTES_PER_CHUNK);
-
- param->chunks_per_block = YAFFS_CHUNKS_PER_BLOCK;
- param->total_bytes_per_chunk = YAFFS_BYTES_PER_CHUNK;
- }
-
- param->start_block = 0;
- param->end_block = n_blocks - 1;
-
- yaffs_mtd_drv_install(dev);
-
- param->sb_dirty_fn = yaffs_set_super_dirty;
- param->gc_control_fn = yaffs_gc_control_callback;
-
- yaffs_dev_to_lc(dev)->super = sb;
-
- param->use_nand_ecc = 1;
-
- param->skip_checkpt_rd = options.skip_checkpoint_read;
- param->skip_checkpt_wr = options.skip_checkpoint_write;
-
- mutex_lock(&yaffs_context_lock);
- /* Get a mount id */
- found = 0;
- for (mount_id = 0; !found; mount_id++) {
- found = 1;
- list_for_each(l, &yaffs_context_list) {
- context_iterator =
- list_entry(l, struct yaffs_linux_context,
- context_list);
- if (context_iterator->mount_id == mount_id)
- found = 0;
- }
- }
- context->mount_id = mount_id;
-
- list_add_tail(&(yaffs_dev_to_lc(dev)->context_list),
- &yaffs_context_list);
- mutex_unlock(&yaffs_context_lock);
-
- /* Directory search handling... */
- INIT_LIST_HEAD(&(yaffs_dev_to_lc(dev)->search_contexts));
- param->remove_obj_fn = yaffs_remove_obj_callback;
-
- mutex_init(&(yaffs_dev_to_lc(dev)->gross_lock));
-
- yaffs_gross_lock(dev);
-
- err = yaffs_guts_initialise(dev);
-
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_read_super: guts initialised %s",
- (err == YAFFS_OK) ? "OK" : "FAILED");
-
- if (err == YAFFS_OK)
- yaffs_bg_start(dev);
-
- if (!context->bg_thread)
- param->defered_dir_update = 0;
-
- sb->s_maxbytes = yaffs_max_file_size(dev);
-
- /* Release lock before yaffs_get_inode() */
- yaffs_gross_unlock(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;
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: got root inode");
-
- root = yaffs_make_root(inode);
-
- if (!root)
- return NULL;
-
- sb->s_root = root;
- if(!dev->is_checkpointed)
- yaffs_set_super_dirty(dev);
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs_read_super: is_checkpointed %d",
- dev->is_checkpointed);
-
- yaffs_trace(YAFFS_TRACE_OS, "yaffs_read_super: done");
- 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, 39))
-static struct dentry *yaffs_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data)
-{
- return mount_bdev(fs_type, flags, dev_name, data, yaffs_internal_read_super_mtd);
-}
-#elif (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",
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
- .mount = yaffs_mount,
-#else
- .get_sb = yaffs_read_super,
-#endif
- .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
-
-
-#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, 39))
-static struct dentry *yaffs2_mount(struct file_system_type *fs_type, int flags,
- const char *dev_name, void *data)
-{
- return mount_bdev(fs_type, flags, dev_name, data, yaffs2_internal_read_super_mtd);
-}
-#elif (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",
-#if (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 39))
- .mount = yaffs2_mount,
-#else
- .get_sb = yaffs2_read_super,
-#endif
- .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
-
-
-static struct proc_dir_entry *my_proc_entry;
-
-static char *yaffs_dump_dev_part0(char *buf, struct yaffs_dev *dev)
-{
- struct yaffs_param *param = &dev->param;
- int bs[10];
-
- yaffs_count_blocks_by_state(dev,bs);
-
- buf += sprintf(buf, "start_block.......... %d\n", param->start_block);
- buf += sprintf(buf, "end_block............ %d\n", param->end_block);
- buf += sprintf(buf, "total_bytes_per_chunk %d\n",
- param->total_bytes_per_chunk);
- buf += sprintf(buf, "use_nand_ecc......... %d\n", param->use_nand_ecc);
- buf += sprintf(buf, "no_tags_ecc.......... %d\n", param->no_tags_ecc);
- buf += sprintf(buf, "is_yaffs2............ %d\n", param->is_yaffs2);
- buf += sprintf(buf, "inband_tags.......... %d\n", param->inband_tags);
- buf += sprintf(buf, "empty_lost_n_found... %d\n",
- param->empty_lost_n_found);
- buf += sprintf(buf, "disable_lazy_load.... %d\n",
- param->disable_lazy_load);
- buf += sprintf(buf, "disable_bad_block_mrk %d\n",
- param->disable_bad_block_marking);
- buf += sprintf(buf, "refresh_period....... %d\n",
- param->refresh_period);
- buf += sprintf(buf, "n_caches............. %d\n", param->n_caches);
- buf += sprintf(buf, "n_reserved_blocks.... %d\n",
- param->n_reserved_blocks);
- buf += sprintf(buf, "always_check_erased.. %d\n",
- param->always_check_erased);
- buf += sprintf(buf, "\n");
- buf += sprintf(buf, "block count by state\n");
- buf += sprintf(buf, "0:%d 1:%d 2:%d 3:%d 4:%d\n",
- bs[0], bs[1], bs[2], bs[3], bs[4]);
- buf += sprintf(buf, "5:%d 6:%d 7:%d 8:%d 9:%d\n",
- bs[5], bs[6], bs[7], bs[8], bs[9]);
-
- return buf;
-}
-
-static char *yaffs_dump_dev_part1(char *buf, struct yaffs_dev *dev)
-{
- buf += sprintf(buf, "max file size....... %lld\n",
- (long long) yaffs_max_file_size(dev));
- buf += sprintf(buf, "data_bytes_per_chunk. %d\n",
- dev->data_bytes_per_chunk);
- buf += sprintf(buf, "chunk_grp_bits....... %d\n", dev->chunk_grp_bits);
- buf += sprintf(buf, "chunk_grp_size....... %d\n", dev->chunk_grp_size);
- buf += sprintf(buf, "n_erased_blocks...... %d\n", dev->n_erased_blocks);
- buf += sprintf(buf, "blocks_in_checkpt.... %d\n",
- dev->blocks_in_checkpt);
- buf += sprintf(buf, "\n");
- buf += sprintf(buf, "n_tnodes............. %d\n", dev->n_tnodes);
- buf += sprintf(buf, "n_obj................ %d\n", dev->n_obj);
- buf += sprintf(buf, "n_free_chunks........ %d\n", dev->n_free_chunks);
- buf += sprintf(buf, "\n");
- buf += sprintf(buf, "n_page_writes........ %u\n", dev->n_page_writes);
- buf += sprintf(buf, "n_page_reads......... %u\n", dev->n_page_reads);
- buf += sprintf(buf, "n_erasures........... %u\n", dev->n_erasures);
- buf += sprintf(buf, "n_gc_copies.......... %u\n", dev->n_gc_copies);
- buf += sprintf(buf, "all_gcs.............. %u\n", dev->all_gcs);
- buf += sprintf(buf, "passive_gc_count..... %u\n",
- dev->passive_gc_count);
- buf += sprintf(buf, "oldest_dirty_gc_count %u\n",
- dev->oldest_dirty_gc_count);
- buf += sprintf(buf, "n_gc_blocks.......... %u\n", dev->n_gc_blocks);
- buf += sprintf(buf, "bg_gcs............... %u\n", dev->bg_gcs);
- buf += sprintf(buf, "n_retried_writes..... %u\n",
- dev->n_retried_writes);
- buf += sprintf(buf, "n_retired_blocks..... %u\n",
- dev->n_retired_blocks);
- buf += sprintf(buf, "n_ecc_fixed.......... %u\n", dev->n_ecc_fixed);
- buf += sprintf(buf, "n_ecc_unfixed........ %u\n", dev->n_ecc_unfixed);
- buf += sprintf(buf, "n_tags_ecc_fixed..... %u\n",
- dev->n_tags_ecc_fixed);
- buf += sprintf(buf, "n_tags_ecc_unfixed... %u\n",
- dev->n_tags_ecc_unfixed);
- buf += sprintf(buf, "cache_hits........... %u\n", dev->cache_hits);
- buf += sprintf(buf, "n_deleted_files...... %u\n", dev->n_deleted_files);
- buf += sprintf(buf, "n_unlinked_files..... %u\n",
- dev->n_unlinked_files);
- buf += sprintf(buf, "refresh_count........ %u\n", dev->refresh_count);
- buf += sprintf(buf, "n_bg_deletions....... %u\n", dev->n_bg_deletions);
- buf += sprintf(buf, "tags_used............ %u\n", dev->tags_used);
- buf += sprintf(buf, "summary_used......... %u\n", dev->summary_used);
-
- return buf;
-}
-
-static int yaffs_proc_read(char *page,
- char **start,
- off_t offset, int count, int *eof, void *data)
-{
- struct list_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 dev_list.
- * 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."
- "\n");
- else if (step == 1)
- buf += sprintf(buf, "\n");
- else {
- step -= 2;
-
- mutex_lock(&yaffs_context_lock);
-
- /* Locate and print the Nth entry. Order N-squared but N is small. */
- list_for_each(item, &yaffs_context_list) {
- struct yaffs_linux_context *dc =
- list_entry(item, struct yaffs_linux_context,
- context_list);
- struct yaffs_dev *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;
- }
- mutex_unlock(&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},
- {"mount", YAFFS_TRACE_MOUNT},
- {"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)
-{
- 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_trace_mask;
-
- 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_trace_mask = rg | YAFFS_TRACE_ALWAYS;
-
- printk(KERN_DEBUG "new trace = 0x%08X\n", yaffs_trace_mask);
-
- 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;
-}
-
-/* Debug strings are of the form:
- * .bnnn print info on block n
- * .cobjn,chunkn print nand chunk id for objn:chunkn
- */
-
-static int yaffs_proc_debug_write(struct file *file, const char *buf,
- unsigned long count)
-{
-
- char str[100];
- char *p0;
- char *p1;
- long p1_val;
- long p0_val;
- char cmd;
- struct list_head *item;
-
- memset(str, 0, sizeof(str));
- memcpy(str, buf, min((size_t)count, sizeof(str) -1));
-
- cmd = str[1];
-
- p0 = str + 2;
-
- p1 = p0;
-
- while (*p1 && *p1 != ',') {
- p1++;
- }
- *p1 = '\0';
- p1++;
-
- p0_val = simple_strtol(p0, NULL, 0);
- p1_val = simple_strtol(p1, NULL, 0);
-
-
- mutex_lock(&yaffs_context_lock);
-
- /* Locate and print the Nth entry. Order N-squared but N is small. */
- list_for_each(item, &yaffs_context_list) {
- struct yaffs_linux_context *dc =
- list_entry(item, struct yaffs_linux_context,
- context_list);
- struct yaffs_dev *dev = dc->dev;
-
- if (cmd == 'b') {
- struct yaffs_block_info *bi;
-
- bi = yaffs_get_block_info(dev,p0_val);
-
- if(bi) {
- printk("Block %d: state %d, retire %d, use %d, seq %d\n",
- (int)p0_val, bi->block_state,
- bi->needs_retiring, bi->pages_in_use,
- bi->seq_number);
- }
- } else if (cmd == 'c') {
- struct yaffs_obj *obj;
- int nand_chunk;
-
- obj = yaffs_find_by_number(dev, p0_val);
- if (!obj)
- printk("No obj %d\n", (int)p0_val);
- else {
- if(p1_val == 0)
- nand_chunk = obj->hdr_chunk;
- else
- nand_chunk =
- yaffs_find_chunk_in_file(obj,
- p1_val, NULL);
- printk("Nand chunk for %d:%d is %d\n",
- (int)p0_val, (int)p1_val, nand_chunk);
- }
- }
- }
-
- mutex_unlock(&yaffs_context_lock);
-
- return count;
-}
-
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(3, 14, 0))
-static int yaffs_proc_write(struct file *file, const char *buf,
- unsigned long count, void *ppos)
-#else
-static ssize_t yaffs_proc_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-#endif
-{
- if (buf[0] == '.')
- return yaffs_proc_debug_write(file, buf, count);
- return yaffs_proc_write_trace_options(file, buf, 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}
-};
-
-
-#ifdef YAFFS_NEW_PROCFS
-static int yaffs_proc_show(struct seq_file *m, void *v)
-{
- /* FIXME: Unify in a better way? */
- char buffer[512];
- char *start;
- int len;
-
- len = yaffs_proc_read(buffer, &start, 0, sizeof(buffer), NULL, NULL);
- seq_puts(m, buffer);
- return 0;
-}
-
-static int yaffs_proc_open(struct inode *inode, struct file *file)
-{
- return single_open(file, yaffs_proc_show, NULL);
-}
-
-static struct file_operations procfs_ops = {
- .owner = THIS_MODULE,
- .open = yaffs_proc_open,
- .read = seq_read,
- .write = yaffs_proc_write,
-};
-
-static int yaffs_procfs_init(void)
-{
- /* Install the proc_fs entries */
- my_proc_entry = proc_create("yaffs",
- S_IRUGO | S_IFREG,
- YPROC_ROOT,
- &procfs_ops);
-
- if (my_proc_entry) {
- return 0;
- } else {
- return -ENOMEM;
- }
-}
-
-#else
-
-
-static int yaffs_procfs_init(void)
-{
- /* 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;
- return 0;
- } else {
- return -ENOMEM;
- }
-}
-
-#endif
-
-
-static int __init init_yaffs_fs(void)
-{
- int error = 0;
- struct file_system_to_install *fsinst;
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs Installing.");
-
- mutex_init(&yaffs_context_lock);
-
- error = yaffs_procfs_init();
- if (error)
- return error;
-
- /* 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;
-
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "yaffs removing.");
-
- 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., 2002-2011");
-MODULE_LICENSE("GPL");
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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"
-#include "yaffs_attribs.h"
-
-int yaffs1_scan(struct yaffs_dev *dev)
-{
- struct yaffs_ext_tags tags;
- int blk;
- int result;
- int chunk;
- int c;
- int deleted;
- enum yaffs_block_state state;
- LIST_HEAD(hard_list);
- struct yaffs_block_info *bi;
- u32 seq_number;
- struct yaffs_obj_hdr *oh;
- struct yaffs_obj *in;
- struct yaffs_obj *parent;
- int alloc_failed = 0;
- struct yaffs_shadow_fixer *shadow_fixers = NULL;
- u8 *chunk_data;
-
- yaffs_trace(YAFFS_TRACE_SCAN,
- "yaffs1_scan starts intstartblk %d intendblk %d...",
- dev->internal_start_block, dev->internal_end_block);
-
- chunk_data = yaffs_get_temp_buffer(dev);
-
- dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
- /* Scan all the blocks to determine their state */
- bi = dev->block_info;
- for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
- blk++) {
- yaffs_clear_chunk_bits(dev, blk);
- bi->pages_in_use = 0;
- bi->soft_del_pages = 0;
-
- yaffs_query_init_block_state(dev, blk, &state, &seq_number);
-
- bi->block_state = state;
- bi->seq_number = seq_number;
-
- if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
- bi->block_state = state = YAFFS_BLOCK_STATE_DEAD;
-
- yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
- "Block scanning block %d state %d seq %d",
- blk, state, seq_number);
-
- if (state == YAFFS_BLOCK_STATE_DEAD) {
- yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
- "block %d is bad", blk);
- } else if (state == YAFFS_BLOCK_STATE_EMPTY) {
- yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
- dev->n_erased_blocks++;
- dev->n_free_chunks += dev->param.chunks_per_block;
- }
- bi++;
- }
-
- /* For each block.... */
- for (blk = dev->internal_start_block;
- !alloc_failed && blk <= dev->internal_end_block; blk++) {
-
- cond_resched();
-
- bi = yaffs_get_block_info(dev, blk);
- state = bi->block_state;
-
- deleted = 0;
-
- /* For each chunk in each block that needs scanning.... */
- for (c = 0;
- !alloc_failed && c < dev->param.chunks_per_block &&
- state == YAFFS_BLOCK_STATE_NEEDS_SCAN; c++) {
- /* Read the tags and decide what to do */
- chunk = blk * dev->param.chunks_per_block + c;
-
- result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL,
- &tags);
-
- /* Let's have a good look at this chunk... */
-
- if (tags.ecc_result == YAFFS_ECC_RESULT_UNFIXED ||
- tags.is_deleted) {
- /* YAFFS1 only...
- * A deleted chunk
- */
- deleted++;
- dev->n_free_chunks++;
- } else if (!tags.chunk_used) {
- /* 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->n_erased_blocks++;
- } else {
- /* this is the block being allocated */
- yaffs_trace(YAFFS_TRACE_SCAN,
- " Allocating from %d %d",
- blk, c);
- state = YAFFS_BLOCK_STATE_ALLOCATING;
- dev->alloc_block = blk;
- dev->alloc_page = c;
- dev->alloc_block_finder = blk;
-
- }
-
- dev->n_free_chunks +=
- (dev->param.chunks_per_block - c);
- } else if (tags.chunk_id > 0) {
- /* chunk_id > 0 so it is a data chunk... */
- unsigned int endpos;
-
- yaffs_set_chunk_bit(dev, blk, c);
- bi->pages_in_use++;
-
- in = yaffs_find_or_create_by_number(dev,
- tags.obj_id,
- YAFFS_OBJECT_TYPE_FILE);
- /* PutChunkIntoFile checks for a clash
- * (two data chunks with the same chunk_id).
- */
-
- if (!in)
- alloc_failed = 1;
-
- if (in) {
- if (!yaffs_put_chunk_in_file
- (in, tags.chunk_id, chunk, 1))
- alloc_failed = 1;
- }
-
- endpos =
- (tags.chunk_id - 1) *
- dev->data_bytes_per_chunk +
- tags.n_bytes;
- if (in &&
- in->variant_type ==
- YAFFS_OBJECT_TYPE_FILE &&
- in->variant.file_variant.scanned_size <
- endpos) {
- in->variant.file_variant.scanned_size =
- endpos;
- if (!dev->param.use_header_file_size) {
- in->variant.
- file_variant.file_size =
- in->variant.
- file_variant.scanned_size;
- }
-
- }
- } else {
- /* chunk_id == 0, so it is an ObjectHeader.
- * Make the object
- */
- yaffs_set_chunk_bit(dev, blk, c);
- bi->pages_in_use++;
-
- result = yaffs_rd_chunk_tags_nand(dev, chunk,
- chunk_data,
- NULL);
-
- oh = (struct yaffs_obj_hdr *)chunk_data;
-
- in = yaffs_find_by_number(dev, tags.obj_id);
- if (in && in->variant_type != oh->type) {
- /* This should not happen, but somehow
- * Wev'e ended up with an obj_id that
- * has been reused but not yet deleted,
- * and worse still it has changed type.
- * Delete the old object.
- */
-
- yaffs_del_obj(in);
- in = NULL;
- }
-
- in = yaffs_find_or_create_by_number(dev,
- tags.obj_id,
- oh->type);
-
- if (!in)
- alloc_failed = 1;
-
- if (in && oh->shadows_obj > 0) {
-
- struct yaffs_shadow_fixer *fixer;
- fixer =
- kmalloc(sizeof
- (struct yaffs_shadow_fixer),
- GFP_NOFS);
- if (fixer) {
- fixer->next = shadow_fixers;
- shadow_fixers = fixer;
- fixer->obj_id = tags.obj_id;
- fixer->shadowed_id =
- oh->shadows_obj;
- yaffs_trace(YAFFS_TRACE_SCAN,
- " Shadow fixer: %d shadows %d",
- fixer->obj_id,
- fixer->shadowed_id);
-
- }
-
- }
-
- if (in && in->valid) {
- /* We have already filled this one.
- * We have a duplicate and need to
- * resolve it. */
-
- unsigned existing_serial = in->serial;
- unsigned new_serial =
- tags.serial_number;
-
- if (((existing_serial + 1) & 3) ==
- new_serial) {
- /* Use new one - destroy the
- * exisiting one */
- yaffs_chunk_del(dev,
- in->hdr_chunk,
- 1, __LINE__);
- in->valid = 0;
- } else {
- /* Use existing - destroy
- * this one. */
- yaffs_chunk_del(dev, chunk, 1,
- __LINE__);
- }
- }
-
- if (in && !in->valid &&
- (tags.obj_id == YAFFS_OBJECTID_ROOT ||
- tags.obj_id ==
- YAFFS_OBJECTID_LOSTNFOUND)) {
- /* We only load some info, don't fiddle
- * with directory structure */
- in->valid = 1;
- in->variant_type = oh->type;
-
- in->yst_mode = oh->yst_mode;
- yaffs_load_attribs(in, oh);
- in->hdr_chunk = chunk;
- in->serial = tags.serial_number;
-
- } else if (in && !in->valid) {
- /* we need to load this info */
-
- in->valid = 1;
- in->variant_type = oh->type;
-
- in->yst_mode = oh->yst_mode;
- yaffs_load_attribs(in, oh);
- in->hdr_chunk = chunk;
- in->serial = tags.serial_number;
-
- yaffs_set_obj_name_from_oh(in, oh);
- in->dirty = 0;
-
- /* directory stuff...
- * hook up to parent
- */
-
- parent =
- yaffs_find_or_create_by_number
- (dev, oh->parent_obj_id,
- YAFFS_OBJECT_TYPE_DIRECTORY);
- if (!parent)
- alloc_failed = 1;
- if (parent && parent->variant_type ==
- YAFFS_OBJECT_TYPE_UNKNOWN) {
- /* Set up as a directory */
- parent->variant_type =
- YAFFS_OBJECT_TYPE_DIRECTORY;
- INIT_LIST_HEAD(&parent->
- variant.dir_variant.
- children);
- } else if (!parent ||
- parent->variant_type !=
- YAFFS_OBJECT_TYPE_DIRECTORY) {
- /* Hoosterman, a problem....
- * We're trying to use a
- * non-directory as a directory
- */
-
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
- );
- parent = dev->lost_n_found;
- }
-
- yaffs_add_obj_to_dir(parent, in);
-
- switch (in->variant_type) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Todo got a problem */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- if (dev->param.
- use_header_file_size)
- in->variant.
- file_variant.file_size
- = yaffs_oh_to_size(oh);
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- in->variant.
- hardlink_variant.equiv_id =
- oh->equiv_id;
- list_add(&in->hard_links,
- &hard_list);
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- in->variant.symlink_variant.
- alias =
- yaffs_clone_str(oh->alias);
- if (!in->variant.
- symlink_variant.alias)
- alloc_failed = 1;
- break;
- }
- }
- }
- }
-
- if (state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
- /* 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->alloc_block = -1;
- }
-
- bi->block_state = state;
-
- /* Now let's see if it was dirty */
- if (bi->pages_in_use == 0 &&
- !bi->has_shrink_hdr &&
- bi->block_state == YAFFS_BLOCK_STATE_FULL)
- yaffs_block_became_dirty(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_link_fixup(dev, &hard_list);
-
- /*
- * Fix up any shadowed objects.
- * There should not be more than one of these.
- */
- {
- struct yaffs_shadow_fixer *fixer;
- struct yaffs_obj *obj;
-
- while (shadow_fixers) {
- fixer = shadow_fixers;
- shadow_fixers = fixer->next;
- /* Complete the rename transaction by deleting the
- * shadowed object then setting the object header
- to unshadowed.
- */
- obj = yaffs_find_by_number(dev, fixer->shadowed_id);
- if (obj)
- yaffs_del_obj(obj);
-
- obj = yaffs_find_by_number(dev, fixer->obj_id);
-
- if (obj)
- yaffs_update_oh(obj, NULL, 1, 0, 0, NULL);
-
- kfree(fixer);
- }
- }
-
- yaffs_release_temp_buffer(dev, chunk_data);
-
- if (alloc_failed)
- return YAFFS_FAIL;
-
- yaffs_trace(YAFFS_TRACE_SCAN, "yaffs1_scan ends");
-
- return YAFFS_OK;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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(struct yaffs_dev *dev);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet Another Flash File System. A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_nand.h"
-#include "yaffs_getblockinfo.h"
-#include "yaffs_verify.h"
-#include "yaffs_attribs.h"
-#include "yaffs_summary.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.
- */
-
-/* yaffs_calc_oldest_dirty_seq()
- * yaffs2_find_oldest_dirty_seq()
- * Calculate the oldest dirty sequence number if we don't know it.
- */
-void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev)
-{
- int i;
- unsigned seq;
- unsigned block_no = 0;
- struct yaffs_block_info *b;
-
- if (!dev->param.is_yaffs2)
- return;
-
- /* Find the oldest dirty sequence number. */
- seq = dev->seq_number + 1;
- b = dev->block_info;
- for (i = dev->internal_start_block; i <= dev->internal_end_block; i++) {
- if (b->block_state == YAFFS_BLOCK_STATE_FULL &&
- (b->pages_in_use - b->soft_del_pages) <
- dev->param.chunks_per_block &&
- b->seq_number < seq) {
- seq = b->seq_number;
- block_no = i;
- }
- b++;
- }
-
- if (block_no) {
- dev->oldest_dirty_seq = seq;
- dev->oldest_dirty_block = block_no;
- }
-}
-
-void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev)
-{
- if (!dev->param.is_yaffs2)
- return;
-
- if (!dev->oldest_dirty_seq)
- yaffs_calc_oldest_dirty_seq(dev);
-}
-
-/*
- * yaffs_clear_oldest_dirty_seq()
- * Called when a block is erased or marked bad. (ie. when its seq_number
- * becomes invalid). If the value matches the oldest then we clear
- * dev->oldest_dirty_seq to force its recomputation.
- */
-void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
- struct yaffs_block_info *bi)
-{
-
- if (!dev->param.is_yaffs2)
- return;
-
- if (!bi || bi->seq_number == dev->oldest_dirty_seq) {
- dev->oldest_dirty_seq = 0;
- dev->oldest_dirty_block = 0;
- }
-}
-
-/*
- * yaffs2_update_oldest_dirty_seq()
- * Update the oldest dirty sequence number whenever we dirty a block.
- * Only do this if the oldest_dirty_seq is actually being tracked.
- */
-void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
- struct yaffs_block_info *bi)
-{
- if (!dev->param.is_yaffs2)
- return;
-
- if (dev->oldest_dirty_seq) {
- if (dev->oldest_dirty_seq > bi->seq_number) {
- dev->oldest_dirty_seq = bi->seq_number;
- dev->oldest_dirty_block = block_no;
- }
- }
-}
-
-int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi)
-{
-
- if (!dev->param.is_yaffs2)
- return 1; /* disqualification only applies to yaffs2. */
-
- if (!bi->has_shrink_hdr)
- return 1; /* can gc */
-
- yaffs2_find_oldest_dirty_seq(dev);
-
- /* Can't do gc of this block if there are any blocks older than this
- * one that have discarded pages.
- */
- return (bi->seq_number <= dev->oldest_dirty_seq);
-}
-
-/*
- * yaffs2_find_refresh_block()
- * periodically finds the oldest full block by sequence number for refreshing.
- * Only for yaffs2.
- */
-u32 yaffs2_find_refresh_block(struct yaffs_dev *dev)
-{
- u32 b;
- u32 oldest = 0;
- u32 oldest_seq = 0;
- struct yaffs_block_info *bi;
-
- if (!dev->param.is_yaffs2)
- return oldest;
-
- /*
- * If refresh period < 10 then refreshing is disabled.
- */
- if (dev->param.refresh_period < 10)
- return oldest;
-
- /*
- * Fix broken values.
- */
- if (dev->refresh_skip > dev->param.refresh_period)
- dev->refresh_skip = dev->param.refresh_period;
-
- if (dev->refresh_skip > 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->refresh_skip = dev->param.refresh_period;
- dev->refresh_count++;
- bi = dev->block_info;
- for (b = dev->internal_start_block; b <= dev->internal_end_block; b++) {
-
- if (bi->block_state == YAFFS_BLOCK_STATE_FULL) {
-
- if (oldest < 1 || bi->seq_number < oldest_seq) {
- oldest = b;
- oldest_seq = bi->seq_number;
- }
- }
- bi++;
- }
-
- if (oldest > 0) {
- yaffs_trace(YAFFS_TRACE_GC,
- "GC refresh count %d selected block %d with seq_number %d",
- dev->refresh_count, oldest, oldest_seq);
- }
-
- return oldest;
-}
-
-int yaffs2_checkpt_required(struct yaffs_dev *dev)
-{
- int nblocks;
-
- if (!dev->param.is_yaffs2)
- return 0;
-
- nblocks = dev->internal_end_block - dev->internal_start_block + 1;
-
- return !dev->param.skip_checkpt_wr &&
- !dev->read_only && (nblocks >= YAFFS_CHECKPOINT_MIN_BLOCKS);
-}
-
-int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev)
-{
- int retval;
- int n_bytes = 0;
- int n_blocks;
- int dev_blocks;
-
- if (!dev->param.is_yaffs2)
- return 0;
-
- if (!dev->checkpoint_blocks_required && yaffs2_checkpt_required(dev)) {
- /* Not a valid value so recalculate */
- dev_blocks = dev->param.end_block - dev->param.start_block + 1;
- n_bytes += sizeof(struct yaffs_checkpt_validity);
- n_bytes += sizeof(struct yaffs_checkpt_dev);
- n_bytes += dev_blocks * sizeof(struct yaffs_block_info);
- n_bytes += dev_blocks * dev->chunk_bit_stride;
- n_bytes +=
- (sizeof(struct yaffs_checkpt_obj) + sizeof(u32)) *
- dev->n_obj;
- n_bytes += (dev->tnode_size + sizeof(u32)) * dev->n_tnodes;
- n_bytes += sizeof(struct yaffs_checkpt_validity);
- n_bytes += sizeof(u32); /* checksum */
-
- /* Round up and add 2 blocks to allow for some bad blocks,
- * so add 3 */
-
- n_blocks =
- (n_bytes /
- (dev->data_bytes_per_chunk *
- dev->param.chunks_per_block)) + 3;
-
- dev->checkpoint_blocks_required = n_blocks;
- }
-
- retval = dev->checkpoint_blocks_required - dev->blocks_in_checkpt;
- if (retval < 0)
- retval = 0;
- return retval;
-}
-
-/*--------------------- Checkpointing --------------------*/
-
-static int yaffs2_wr_checkpt_validity_marker(struct yaffs_dev *dev, int head)
-{
- struct yaffs_checkpt_validity cp;
-
- memset(&cp, 0, sizeof(cp));
-
- cp.struct_type = sizeof(cp);
- cp.magic = YAFFS_MAGIC;
- cp.version = YAFFS_CHECKPOINT_VERSION;
- cp.head = (head) ? 1 : 0;
-
- return (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp)) ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_validity_marker(struct yaffs_dev *dev, int head)
-{
- struct yaffs_checkpt_validity cp;
- int ok;
-
- ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
-
- if (ok)
- ok = (cp.struct_type == sizeof(cp)) &&
- (cp.magic == YAFFS_MAGIC) &&
- (cp.version == YAFFS_CHECKPOINT_VERSION) &&
- (cp.head == ((head) ? 1 : 0));
- return ok ? 1 : 0;
-}
-
-static void yaffs2_dev_to_checkpt_dev(struct yaffs_checkpt_dev *cp,
- struct yaffs_dev *dev)
-{
- cp->n_erased_blocks = dev->n_erased_blocks;
- cp->alloc_block = dev->alloc_block;
- cp->alloc_page = dev->alloc_page;
- cp->n_free_chunks = dev->n_free_chunks;
-
- cp->n_deleted_files = dev->n_deleted_files;
- cp->n_unlinked_files = dev->n_unlinked_files;
- cp->n_bg_deletions = dev->n_bg_deletions;
- cp->seq_number = dev->seq_number;
-
-}
-
-static void yaffs_checkpt_dev_to_dev(struct yaffs_dev *dev,
- struct yaffs_checkpt_dev *cp)
-{
- dev->n_erased_blocks = cp->n_erased_blocks;
- dev->alloc_block = cp->alloc_block;
- dev->alloc_page = cp->alloc_page;
- dev->n_free_chunks = cp->n_free_chunks;
-
- dev->n_deleted_files = cp->n_deleted_files;
- dev->n_unlinked_files = cp->n_unlinked_files;
- dev->n_bg_deletions = cp->n_bg_deletions;
- dev->seq_number = cp->seq_number;
-}
-
-static int yaffs2_wr_checkpt_dev(struct yaffs_dev *dev)
-{
- struct yaffs_checkpt_dev cp;
- u32 n_bytes;
- u32 n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
- int ok;
-
- /* Write device runtime values */
- yaffs2_dev_to_checkpt_dev(&cp, dev);
- cp.struct_type = sizeof(cp);
-
- ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
- if (!ok)
- return 0;
-
- /* Write block info */
- n_bytes = n_blocks * sizeof(struct yaffs_block_info);
- ok = (yaffs2_checkpt_wr(dev, dev->block_info, n_bytes) == n_bytes);
- if (!ok)
- return 0;
-
- /* Write chunk bits */
- n_bytes = n_blocks * dev->chunk_bit_stride;
- ok = (yaffs2_checkpt_wr(dev, dev->chunk_bits, n_bytes) == n_bytes);
-
- return ok ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_dev(struct yaffs_dev *dev)
-{
- struct yaffs_checkpt_dev cp;
- u32 n_bytes;
- u32 n_blocks =
- (dev->internal_end_block - dev->internal_start_block + 1);
- int ok;
-
- ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
- if (!ok)
- return 0;
-
- if (cp.struct_type != sizeof(cp))
- return 0;
-
- yaffs_checkpt_dev_to_dev(dev, &cp);
-
- n_bytes = n_blocks * sizeof(struct yaffs_block_info);
-
- ok = (yaffs2_checkpt_rd(dev, dev->block_info, n_bytes) == n_bytes);
-
- if (!ok)
- return 0;
-
- n_bytes = n_blocks * dev->chunk_bit_stride;
-
- ok = (yaffs2_checkpt_rd(dev, dev->chunk_bits, n_bytes) == n_bytes);
-
- return ok ? 1 : 0;
-}
-
-static void yaffs2_obj_checkpt_obj(struct yaffs_checkpt_obj *cp,
- struct yaffs_obj *obj)
-{
- cp->obj_id = obj->obj_id;
- cp->parent_id = (obj->parent) ? obj->parent->obj_id : 0;
- cp->hdr_chunk = obj->hdr_chunk;
- cp->variant_type = obj->variant_type;
- cp->deleted = obj->deleted;
- cp->soft_del = obj->soft_del;
- cp->unlinked = obj->unlinked;
- cp->fake = obj->fake;
- cp->rename_allowed = obj->rename_allowed;
- cp->unlink_allowed = obj->unlink_allowed;
- cp->serial = obj->serial;
- cp->n_data_chunks = obj->n_data_chunks;
-
- if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
- cp->size_or_equiv_obj = obj->variant.file_variant.file_size;
- else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
- cp->size_or_equiv_obj = obj->variant.hardlink_variant.equiv_id;
-}
-
-static int yaffs2_checkpt_obj_to_obj(struct yaffs_obj *obj,
- struct yaffs_checkpt_obj *cp)
-{
- struct yaffs_obj *parent;
-
- if (obj->variant_type != cp->variant_type) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "Checkpoint read object %d type %d chunk %d does not match existing object type %d",
- cp->obj_id, cp->variant_type, cp->hdr_chunk,
- obj->variant_type);
- return 0;
- }
-
- obj->obj_id = cp->obj_id;
-
- if (cp->parent_id)
- parent = yaffs_find_or_create_by_number(obj->my_dev,
- cp->parent_id,
- YAFFS_OBJECT_TYPE_DIRECTORY);
- else
- parent = NULL;
-
- if (parent) {
- if (parent->variant_type != YAFFS_OBJECT_TYPE_DIRECTORY) {
- yaffs_trace(YAFFS_TRACE_ALWAYS,
- "Checkpoint read object %d parent %d type %d chunk %d Parent type, %d, not directory",
- cp->obj_id, cp->parent_id,
- cp->variant_type, cp->hdr_chunk,
- parent->variant_type);
- return 0;
- }
- yaffs_add_obj_to_dir(parent, obj);
- }
-
- obj->hdr_chunk = cp->hdr_chunk;
- obj->variant_type = cp->variant_type;
- obj->deleted = cp->deleted;
- obj->soft_del = cp->soft_del;
- obj->unlinked = cp->unlinked;
- obj->fake = cp->fake;
- obj->rename_allowed = cp->rename_allowed;
- obj->unlink_allowed = cp->unlink_allowed;
- obj->serial = cp->serial;
- obj->n_data_chunks = cp->n_data_chunks;
-
- if (obj->variant_type == YAFFS_OBJECT_TYPE_FILE)
- obj->variant.file_variant.file_size = cp->size_or_equiv_obj;
- else if (obj->variant_type == YAFFS_OBJECT_TYPE_HARDLINK)
- obj->variant.hardlink_variant.equiv_id = cp->size_or_equiv_obj;
-
- if (obj->hdr_chunk > 0)
- obj->lazy_loaded = 1;
- return 1;
-}
-
-static int yaffs2_checkpt_tnode_worker(struct yaffs_obj *in,
- struct yaffs_tnode *tn, u32 level,
- int chunk_offset)
-{
- int i;
- struct yaffs_dev *dev = in->my_dev;
- int ok = 1;
- u32 base_offset;
-
- if (!tn)
- return 1;
-
- if (level > 0) {
- for (i = 0; i < YAFFS_NTNODES_INTERNAL && ok; i++) {
- if (!tn->internal[i])
- continue;
- ok = yaffs2_checkpt_tnode_worker(in,
- tn->internal[i],
- level - 1,
- (chunk_offset <<
- YAFFS_TNODES_INTERNAL_BITS) + i);
- }
- return ok;
- }
-
- /* Level 0 tnode */
- base_offset = chunk_offset << YAFFS_TNODES_LEVEL0_BITS;
- ok = (yaffs2_checkpt_wr(dev, &base_offset, sizeof(base_offset)) ==
- sizeof(base_offset));
- if (ok)
- ok = (yaffs2_checkpt_wr(dev, tn, dev->tnode_size) ==
- dev->tnode_size);
-
- return ok;
-}
-
-static int yaffs2_wr_checkpt_tnodes(struct yaffs_obj *obj)
-{
- u32 end_marker = ~0;
- int ok = 1;
-
- if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
- return ok;
-
- ok = yaffs2_checkpt_tnode_worker(obj,
- obj->variant.file_variant.top,
- obj->variant.file_variant.
- top_level, 0);
- if (ok)
- ok = (yaffs2_checkpt_wr(obj->my_dev, &end_marker,
- sizeof(end_marker)) == sizeof(end_marker));
-
- return ok ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_tnodes(struct yaffs_obj *obj)
-{
- u32 base_chunk;
- int ok = 1;
- struct yaffs_dev *dev = obj->my_dev;
- struct yaffs_file_var *file_stuct_ptr = &obj->variant.file_variant;
- struct yaffs_tnode *tn;
- int nread = 0;
-
- ok = (yaffs2_checkpt_rd(dev, &base_chunk, sizeof(base_chunk)) ==
- sizeof(base_chunk));
-
- while (ok && (~base_chunk)) {
- nread++;
- /* Read level 0 tnode */
-
- tn = yaffs_get_tnode(dev);
- if (tn)
- ok = (yaffs2_checkpt_rd(dev, tn, dev->tnode_size) ==
- dev->tnode_size);
- else
- ok = 0;
-
- if (tn && ok)
- ok = yaffs_add_find_tnode_0(dev,
- file_stuct_ptr,
- base_chunk, tn) ? 1 : 0;
-
- if (ok)
- ok = (yaffs2_checkpt_rd
- (dev, &base_chunk,
- sizeof(base_chunk)) == sizeof(base_chunk));
- }
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "Checkpoint read tnodes %d records, last %d. ok %d",
- nread, base_chunk, ok);
-
- return ok ? 1 : 0;
-}
-
-static int yaffs2_wr_checkpt_objs(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj;
- struct yaffs_checkpt_obj cp;
- int i;
- int ok = 1;
- struct list_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++) {
- list_for_each(lh, &dev->obj_bucket[i].list) {
- obj = list_entry(lh, struct yaffs_obj, hash_link);
- if (!obj->defered_free) {
- yaffs2_obj_checkpt_obj(&cp, obj);
- cp.struct_type = sizeof(cp);
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "Checkpoint write object %d parent %d type %d chunk %d obj addr %p",
- cp.obj_id, cp.parent_id,
- cp.variant_type, cp.hdr_chunk, obj);
-
- ok = (yaffs2_checkpt_wr(dev, &cp,
- sizeof(cp)) == sizeof(cp));
-
- if (ok &&
- obj->variant_type ==
- YAFFS_OBJECT_TYPE_FILE)
- ok = yaffs2_wr_checkpt_tnodes(obj);
- }
- }
- }
-
- /* Dump end of list */
- memset(&cp, 0xff, sizeof(struct yaffs_checkpt_obj));
- cp.struct_type = sizeof(cp);
-
- if (ok)
- ok = (yaffs2_checkpt_wr(dev, &cp, sizeof(cp)) == sizeof(cp));
-
- return ok ? 1 : 0;
-}
-
-static int yaffs2_rd_checkpt_objs(struct yaffs_dev *dev)
-{
- struct yaffs_obj *obj;
- struct yaffs_checkpt_obj cp;
- int ok = 1;
- int done = 0;
- LIST_HEAD(hard_list);
-
-
- while (ok && !done) {
- ok = (yaffs2_checkpt_rd(dev, &cp, sizeof(cp)) == sizeof(cp));
- if (cp.struct_type != sizeof(cp)) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "struct size %d instead of %d ok %d",
- cp.struct_type, (int)sizeof(cp), ok);
- ok = 0;
- }
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "Checkpoint read object %d parent %d type %d chunk %d ",
- cp.obj_id, cp.parent_id, cp.variant_type,
- cp.hdr_chunk);
-
- if (ok && cp.obj_id == ~0) {
- done = 1;
- } else if (ok) {
- obj =
- yaffs_find_or_create_by_number(dev, cp.obj_id,
- cp.variant_type);
- if (obj) {
- ok = yaffs2_checkpt_obj_to_obj(obj, &cp);
- if (!ok)
- break;
- if (obj->variant_type ==
- YAFFS_OBJECT_TYPE_FILE) {
- ok = yaffs2_rd_checkpt_tnodes(obj);
- } else if (obj->variant_type ==
- YAFFS_OBJECT_TYPE_HARDLINK) {
- list_add(&obj->hard_links, &hard_list);
- }
- } else {
- ok = 0;
- }
- }
- }
-
- if (ok)
- yaffs_link_fixup(dev, &hard_list);
-
- return ok ? 1 : 0;
-}
-
-static int yaffs2_wr_checkpt_sum(struct yaffs_dev *dev)
-{
- u32 checkpt_sum;
- int ok;
-
- yaffs2_get_checkpt_sum(dev, &checkpt_sum);
-
- ok = (yaffs2_checkpt_wr(dev, &checkpt_sum, sizeof(checkpt_sum)) ==
- sizeof(checkpt_sum));
-
- if (!ok)
- return 0;
-
- return 1;
-}
-
-static int yaffs2_rd_checkpt_sum(struct yaffs_dev *dev)
-{
- u32 checkpt_sum0;
- u32 checkpt_sum1;
- int ok;
-
- yaffs2_get_checkpt_sum(dev, &checkpt_sum0);
-
- ok = (yaffs2_checkpt_rd(dev, &checkpt_sum1, sizeof(checkpt_sum1)) ==
- sizeof(checkpt_sum1));
-
- if (!ok)
- return 0;
-
- if (checkpt_sum0 != checkpt_sum1)
- return 0;
-
- return 1;
-}
-
-static int yaffs2_wr_checkpt_data(struct yaffs_dev *dev)
-{
- int ok = 1;
-
- if (!yaffs2_checkpt_required(dev)) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "skipping checkpoint write");
- ok = 0;
- }
-
- if (ok)
- ok = yaffs2_checkpt_open(dev, 1);
-
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "write checkpoint validity");
- ok = yaffs2_wr_checkpt_validity_marker(dev, 1);
- }
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "write checkpoint device");
- ok = yaffs2_wr_checkpt_dev(dev);
- }
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "write checkpoint objects");
- ok = yaffs2_wr_checkpt_objs(dev);
- }
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "write checkpoint validity");
- ok = yaffs2_wr_checkpt_validity_marker(dev, 0);
- }
-
- if (ok)
- ok = yaffs2_wr_checkpt_sum(dev);
-
- if (!yaffs_checkpt_close(dev))
- ok = 0;
-
- if (ok)
- dev->is_checkpointed = 1;
- else
- dev->is_checkpointed = 0;
-
- return dev->is_checkpointed;
-}
-
-static int yaffs2_rd_checkpt_data(struct yaffs_dev *dev)
-{
- int ok = 1;
-
- if (!dev->param.is_yaffs2)
- ok = 0;
-
- if (ok && dev->param.skip_checkpt_rd) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "skipping checkpoint read");
- ok = 0;
- }
-
- if (ok)
- ok = yaffs2_checkpt_open(dev, 0); /* open for read */
-
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "read checkpoint validity");
- ok = yaffs2_rd_checkpt_validity_marker(dev, 1);
- }
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "read checkpoint device");
- ok = yaffs2_rd_checkpt_dev(dev);
- }
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "read checkpoint objects");
- ok = yaffs2_rd_checkpt_objs(dev);
- }
- if (ok) {
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "read checkpoint validity");
- ok = yaffs2_rd_checkpt_validity_marker(dev, 0);
- }
-
- if (ok) {
- ok = yaffs2_rd_checkpt_sum(dev);
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "read checkpoint checksum %d", ok);
- }
-
- if (!yaffs_checkpt_close(dev))
- ok = 0;
-
- if (ok)
- dev->is_checkpointed = 1;
- else
- dev->is_checkpointed = 0;
-
- return ok ? 1 : 0;
-}
-
-void yaffs2_checkpt_invalidate(struct yaffs_dev *dev)
-{
- if (dev->is_checkpointed || dev->blocks_in_checkpt > 0) {
- dev->is_checkpointed = 0;
- yaffs2_checkpt_invalidate_stream(dev);
- }
- if (dev->param.sb_dirty_fn)
- dev->param.sb_dirty_fn(dev);
-}
-
-int yaffs_checkpoint_save(struct yaffs_dev *dev)
-{
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "save entry: is_checkpointed %d",
- dev->is_checkpointed);
-
- yaffs_verify_objects(dev);
- yaffs_verify_blocks(dev);
- yaffs_verify_free_chunks(dev);
-
- if (!dev->is_checkpointed) {
- yaffs2_checkpt_invalidate(dev);
- yaffs2_wr_checkpt_data(dev);
- }
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT | YAFFS_TRACE_MOUNT,
- "save exit: is_checkpointed %d",
- dev->is_checkpointed);
-
- return dev->is_checkpointed;
-}
-
-int yaffs2_checkpt_restore(struct yaffs_dev *dev)
-{
- int retval;
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "restore entry: is_checkpointed %d",
- dev->is_checkpointed);
-
- retval = yaffs2_rd_checkpt_data(dev);
-
- if (dev->is_checkpointed) {
- yaffs_verify_objects(dev);
- yaffs_verify_blocks(dev);
- yaffs_verify_free_chunks(dev);
- }
-
- yaffs_trace(YAFFS_TRACE_CHECKPOINT,
- "restore exit: is_checkpointed %d",
- dev->is_checkpointed);
-
- return retval;
-}
-
-int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size)
-{
- /* if new_size > old_file_size.
- * 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 old_file_size;
- loff_t increase;
- int small_hole;
- int result = YAFFS_OK;
- struct yaffs_dev *dev = NULL;
- u8 *local_buffer = NULL;
- int small_increase_ok = 0;
-
- if (!obj)
- return YAFFS_FAIL;
-
- if (obj->variant_type != YAFFS_OBJECT_TYPE_FILE)
- return YAFFS_FAIL;
-
- dev = obj->my_dev;
-
- /* Bail out if not yaffs2 mode */
- if (!dev->param.is_yaffs2)
- return YAFFS_OK;
-
- old_file_size = obj->variant.file_variant.file_size;
-
- if (new_size <= old_file_size)
- return YAFFS_OK;
-
- increase = new_size - old_file_size;
-
- if (increase < YAFFS_SMALL_HOLE_THRESHOLD * dev->data_bytes_per_chunk &&
- yaffs_check_alloc_available(dev, YAFFS_SMALL_HOLE_THRESHOLD + 1))
- small_hole = 1;
- else
- small_hole = 0;
-
- if (small_hole)
- local_buffer = yaffs_get_temp_buffer(dev);
-
- if (local_buffer) {
- /* fill hole with zero bytes */
- loff_t pos = old_file_size;
- int this_write;
- int written;
- memset(local_buffer, 0, dev->data_bytes_per_chunk);
- small_increase_ok = 1;
-
- while (increase > 0 && small_increase_ok) {
- this_write = increase;
- if (this_write > dev->data_bytes_per_chunk)
- this_write = dev->data_bytes_per_chunk;
- written =
- yaffs_do_file_wr(obj, local_buffer, pos, this_write,
- 0);
- if (written == this_write) {
- pos += this_write;
- increase -= this_write;
- } else {
- small_increase_ok = 0;
- }
- }
-
- yaffs_release_temp_buffer(dev, local_buffer);
-
- /* If out of space then reverse any chunks we've added */
- if (!small_increase_ok)
- yaffs_resize_file_down(obj, old_file_size);
- }
-
- if (!small_increase_ok &&
- obj->parent &&
- obj->parent->obj_id != YAFFS_OBJECTID_UNLINKED &&
- obj->parent->obj_id != YAFFS_OBJECTID_DELETED) {
- /* Write a hole start header with the old file size */
- yaffs_update_oh(obj, NULL, 0, 1, 0, NULL);
- }
-
- return result;
-}
-
-struct yaffs_block_index {
- int seq;
- int block;
-};
-
-static int yaffs2_ybicmp(const void *a, const void *b)
-{
- int aseq = ((struct yaffs_block_index *)a)->seq;
- int bseq = ((struct yaffs_block_index *)b)->seq;
- int ablock = ((struct yaffs_block_index *)a)->block;
- int bblock = ((struct yaffs_block_index *)b)->block;
-
- if (aseq == bseq)
- return ablock - bblock;
-
- return aseq - bseq;
-}
-
-static inline int yaffs2_scan_chunk(struct yaffs_dev *dev,
- struct yaffs_block_info *bi,
- int blk, int chunk_in_block,
- int *found_chunks,
- u8 *chunk_data,
- struct list_head *hard_list,
- int summary_available)
-{
- struct yaffs_obj_hdr *oh;
- struct yaffs_obj *in;
- struct yaffs_obj *parent;
- int equiv_id;
- loff_t file_size;
- int is_shrink;
- int is_unlinked;
- struct yaffs_ext_tags tags;
- int result;
- int alloc_failed = 0;
- int chunk = blk * dev->param.chunks_per_block + chunk_in_block;
- struct yaffs_file_var *file_var;
- struct yaffs_hardlink_var *hl_var;
- struct yaffs_symlink_var *sl_var;
-
- if (summary_available) {
- result = yaffs_summary_fetch(dev, &tags, chunk_in_block);
- tags.seq_number = bi->seq_number;
- }
-
- if (!summary_available || tags.obj_id == 0) {
- result = yaffs_rd_chunk_tags_nand(dev, chunk, NULL, &tags);
- dev->tags_used++;
- } else {
- dev->summary_used++;
- }
-
- /* Let's have a good look at this chunk... */
-
- if (!tags.chunk_used) {
- /* 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 (*found_chunks) {
- /* This is a chunk that was skipped due
- * to failing the erased check */
- } else if (chunk_in_block == 0) {
- /* We're looking at the first chunk in
- * the block so the block is unused */
- bi->block_state = YAFFS_BLOCK_STATE_EMPTY;
- dev->n_erased_blocks++;
- } else {
- if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
- bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING) {
- if (dev->seq_number == bi->seq_number) {
- /* Allocating from this block*/
- yaffs_trace(YAFFS_TRACE_SCAN,
- " Allocating from %d %d",
- blk, chunk_in_block);
-
- bi->block_state =
- YAFFS_BLOCK_STATE_ALLOCATING;
- dev->alloc_block = blk;
- dev->alloc_page = chunk_in_block;
- dev->alloc_block_finder = blk;
- } else {
- /* This is a partially written block
- * that is not the current
- * allocation block.
- */
- yaffs_trace(YAFFS_TRACE_SCAN,
- "Partially written block %d detected. gc will fix this.",
- blk);
- }
- }
- }
-
- dev->n_free_chunks++;
-
- } else if (tags.ecc_result ==
- YAFFS_ECC_RESULT_UNFIXED) {
- yaffs_trace(YAFFS_TRACE_SCAN,
- " Unfixed ECC in chunk(%d:%d), chunk ignored",
- blk, chunk_in_block);
- dev->n_free_chunks++;
- } else if (tags.obj_id > YAFFS_MAX_OBJECT_ID ||
- tags.chunk_id > YAFFS_MAX_CHUNK_ID ||
- tags.obj_id == YAFFS_OBJECTID_SUMMARY ||
- (tags.chunk_id > 0 &&
- tags.n_bytes > dev->data_bytes_per_chunk) ||
- tags.seq_number != bi->seq_number) {
- yaffs_trace(YAFFS_TRACE_SCAN,
- "Chunk (%d:%d) with bad tags:obj = %d, chunk_id = %d, n_bytes = %d, ignored",
- blk, chunk_in_block, tags.obj_id,
- tags.chunk_id, tags.n_bytes);
- dev->n_free_chunks++;
- } else if (tags.chunk_id > 0) {
- /* chunk_id > 0 so it is a data chunk... */
- loff_t endpos;
- loff_t chunk_base = (tags.chunk_id - 1) *
- dev->data_bytes_per_chunk;
-
- *found_chunks = 1;
-
- yaffs_set_chunk_bit(dev, blk, chunk_in_block);
- bi->pages_in_use++;
-
- in = yaffs_find_or_create_by_number(dev,
- tags.obj_id,
- YAFFS_OBJECT_TYPE_FILE);
- if (!in)
- /* Out of memory */
- alloc_failed = 1;
-
- if (in &&
- in->variant_type == YAFFS_OBJECT_TYPE_FILE &&
- chunk_base < in->variant.file_variant.shrink_size) {
- /* This has not been invalidated by
- * a resize */
- if (!yaffs_put_chunk_in_file(in, tags.chunk_id,
- 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 = chunk_base + tags.n_bytes;
-
- if (!in->valid &&
- in->variant.file_variant.scanned_size < endpos) {
- in->variant.file_variant.
- scanned_size = endpos;
- in->variant.file_variant.
- file_size = endpos;
- }
- } else if (in) {
- /* This chunk has been invalidated by a
- * resize, or a past file deletion
- * so delete the chunk*/
- yaffs_chunk_del(dev, chunk, 1, __LINE__);
- }
- } else {
- /* chunk_id == 0, so it is an ObjectHeader.
- * Thus, we read in the object header and make
- * the object
- */
- *found_chunks = 1;
-
- yaffs_set_chunk_bit(dev, blk, chunk_in_block);
- bi->pages_in_use++;
-
- oh = NULL;
- in = NULL;
-
- if (tags.extra_available) {
- in = yaffs_find_or_create_by_number(dev,
- tags.obj_id,
- tags.extra_obj_type);
- if (!in)
- alloc_failed = 1;
- }
-
- if (!in ||
- (!in->valid && dev->param.disable_lazy_load) ||
- tags.extra_shadows ||
- (!in->valid && (tags.obj_id == YAFFS_OBJECTID_ROOT ||
- tags.obj_id == 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_rd_chunk_tags_nand(dev,
- chunk,
- chunk_data,
- NULL);
-
- oh = (struct yaffs_obj_hdr *)chunk_data;
-
- if (dev->param.inband_tags) {
- /* Fix up the header if they got
- * corrupted by inband tags */
- oh->shadows_obj =
- oh->inband_shadowed_obj_id;
- oh->is_shrink =
- oh->inband_is_shrink;
- }
-
- if (!in) {
- in = yaffs_find_or_create_by_number(dev,
- tags.obj_id, oh->type);
- if (!in)
- alloc_failed = 1;
- }
- }
-
- if (!in) {
- /* TODO Hoosterman we have a problem! */
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: Could not make object for object %d at chunk %d during scan",
- tags.obj_id, chunk);
- return YAFFS_FAIL;
- }
-
- 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->variant_type == YAFFS_OBJECT_TYPE_FILE) &&
- ((oh && oh->type == YAFFS_OBJECT_TYPE_FILE) ||
- (tags.extra_available &&
- tags.extra_obj_type == YAFFS_OBJECT_TYPE_FILE)
- )) {
- loff_t this_size = (oh) ?
- yaffs_oh_to_size(oh) :
- tags.extra_file_size;
- u32 parent_obj_id = (oh) ?
- oh->parent_obj_id :
- tags.extra_parent_id;
-
- is_shrink = (oh) ?
- oh->is_shrink :
- tags.extra_is_shrink;
-
- /* If it is deleted (unlinked
- * at start also means deleted)
- * we treat the file size as
- * being zeroed at this point.
- */
- if (parent_obj_id == YAFFS_OBJECTID_DELETED ||
- parent_obj_id == YAFFS_OBJECTID_UNLINKED) {
- this_size = 0;
- is_shrink = 1;
- }
-
- if (is_shrink &&
- in->variant.file_variant.shrink_size >
- this_size)
- in->variant.file_variant.shrink_size =
- this_size;
-
- if (is_shrink)
- bi->has_shrink_hdr = 1;
- }
- /* Use existing - destroy this one. */
- yaffs_chunk_del(dev, chunk, 1, __LINE__);
- }
-
- if (!in->valid && in->variant_type !=
- (oh ? oh->type : tags.extra_obj_type)) {
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: Bad type, %d != %d, for object %d at chunk %d during scan",
- oh ? oh->type : tags.extra_obj_type,
- in->variant_type, tags.obj_id,
- chunk);
- in = yaffs_retype_obj(in, oh ? oh->type : tags.extra_obj_type);
- }
-
- if (!in->valid &&
- (tags.obj_id == YAFFS_OBJECTID_ROOT ||
- tags.obj_id == 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;
- yaffs_load_attribs(in, oh);
- in->lazy_loaded = 0;
- } else {
- in->lazy_loaded = 1;
- }
- in->hdr_chunk = chunk;
-
- } else if (!in->valid) {
- /* we need to load this info */
- in->valid = 1;
- in->hdr_chunk = chunk;
- if (oh) {
- in->variant_type = oh->type;
- in->yst_mode = oh->yst_mode;
- yaffs_load_attribs(in, oh);
-
- if (oh->shadows_obj > 0)
- yaffs_handle_shadowed_obj(dev,
- oh->shadows_obj, 1);
-
- yaffs_set_obj_name_from_oh(in, oh);
- parent = yaffs_find_or_create_by_number(dev,
- oh->parent_obj_id,
- YAFFS_OBJECT_TYPE_DIRECTORY);
- file_size = yaffs_oh_to_size(oh);
- is_shrink = oh->is_shrink;
- equiv_id = oh->equiv_id;
- } else {
- in->variant_type = tags.extra_obj_type;
- parent = yaffs_find_or_create_by_number(dev,
- tags.extra_parent_id,
- YAFFS_OBJECT_TYPE_DIRECTORY);
- file_size = tags.extra_file_size;
- is_shrink = tags.extra_is_shrink;
- equiv_id = tags.extra_equiv_id;
- in->lazy_loaded = 1;
- }
- in->dirty = 0;
-
- if (!parent)
- alloc_failed = 1;
-
- /* directory stuff...
- * hook up to parent
- */
-
- if (parent &&
- parent->variant_type == YAFFS_OBJECT_TYPE_UNKNOWN) {
- /* Set up as a directory */
- parent->variant_type =
- YAFFS_OBJECT_TYPE_DIRECTORY;
- INIT_LIST_HEAD(&parent->
- variant.dir_variant.children);
- } else if (!parent ||
- parent->variant_type !=
- YAFFS_OBJECT_TYPE_DIRECTORY) {
- /* Hoosterman, another problem....
- * Trying to use a non-directory as a directory
- */
-
- yaffs_trace(YAFFS_TRACE_ERROR,
- "yaffs tragedy: attempting to use non-directory as a directory in scan. Put in lost+found."
- );
- parent = dev->lost_n_found;
- }
- yaffs_add_obj_to_dir(parent, in);
-
- is_unlinked = (parent == dev->del_dir) ||
- (parent == dev->unlinked_dir);
-
- if (is_shrink)
- /* Mark the block */
- bi->has_shrink_hdr = 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->variant_type) {
- case YAFFS_OBJECT_TYPE_UNKNOWN:
- /* Todo got a problem */
- break;
- case YAFFS_OBJECT_TYPE_FILE:
- file_var = &in->variant.file_variant;
- if (file_var->scanned_size < file_size) {
- /* This covers the case where the file
- * size is greater than the data held.
- * This will happen if the file is
- * resized to be larger than its
- * current data extents.
- */
- file_var->file_size = file_size;
- file_var->scanned_size = file_size;
- }
-
- if (file_var->shrink_size > file_size)
- file_var->shrink_size = file_size;
-
- break;
- case YAFFS_OBJECT_TYPE_HARDLINK:
- hl_var = &in->variant.hardlink_variant;
- if (!is_unlinked) {
- hl_var->equiv_id = equiv_id;
- list_add(&in->hard_links, hard_list);
- }
- break;
- case YAFFS_OBJECT_TYPE_DIRECTORY:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SPECIAL:
- /* Do nothing */
- break;
- case YAFFS_OBJECT_TYPE_SYMLINK:
- sl_var = &in->variant.symlink_variant;
- if (oh) {
- sl_var->alias =
- yaffs_clone_str(oh->alias);
- if (!sl_var->alias)
- alloc_failed = 1;
- }
- break;
- }
- }
- }
- return alloc_failed ? YAFFS_FAIL : YAFFS_OK;
-}
-
-int yaffs2_scan_backwards(struct yaffs_dev *dev)
-{
- int blk;
- int block_iter;
- int start_iter;
- int end_iter;
- int n_to_scan = 0;
- enum yaffs_block_state state;
- int c;
- LIST_HEAD(hard_list);
- struct yaffs_block_info *bi;
- u32 seq_number;
- int n_blocks = dev->internal_end_block - dev->internal_start_block + 1;
- u8 *chunk_data;
- int found_chunks;
- int alloc_failed = 0;
- struct yaffs_block_index *block_index = NULL;
- int alt_block_index = 0;
- int summary_available;
-
- yaffs_trace(YAFFS_TRACE_SCAN,
- "yaffs2_scan_backwards starts intstartblk %d intendblk %d...",
- dev->internal_start_block, dev->internal_end_block);
-
- dev->seq_number = YAFFS_LOWEST_SEQUENCE_NUMBER;
-
- block_index =
- kmalloc(n_blocks * sizeof(struct yaffs_block_index), GFP_NOFS);
-
- if (!block_index) {
- block_index =
- vmalloc(n_blocks * sizeof(struct yaffs_block_index));
- alt_block_index = 1;
- }
-
- if (!block_index) {
- yaffs_trace(YAFFS_TRACE_SCAN,
- "yaffs2_scan_backwards() could not allocate block index!"
- );
- return YAFFS_FAIL;
- }
-
- dev->blocks_in_checkpt = 0;
-
- chunk_data = yaffs_get_temp_buffer(dev);
-
- /* Scan all the blocks to determine their state */
- bi = dev->block_info;
- for (blk = dev->internal_start_block; blk <= dev->internal_end_block;
- blk++) {
- yaffs_clear_chunk_bits(dev, blk);
- bi->pages_in_use = 0;
- bi->soft_del_pages = 0;
-
- yaffs_query_init_block_state(dev, blk, &state, &seq_number);
-
- bi->block_state = state;
- bi->seq_number = seq_number;
-
- if (bi->seq_number == YAFFS_SEQUENCE_CHECKPOINT_DATA)
- bi->block_state = YAFFS_BLOCK_STATE_CHECKPOINT;
- if (bi->seq_number == YAFFS_SEQUENCE_BAD_BLOCK)
- bi->block_state = YAFFS_BLOCK_STATE_DEAD;
-
- yaffs_trace(YAFFS_TRACE_SCAN_DEBUG,
- "Block scanning block %d state %d seq %d",
- blk, bi->block_state, seq_number);
-
- if (bi->block_state == YAFFS_BLOCK_STATE_CHECKPOINT) {
- dev->blocks_in_checkpt++;
-
- } else if (bi->block_state == YAFFS_BLOCK_STATE_DEAD) {
- yaffs_trace(YAFFS_TRACE_BAD_BLOCKS,
- "block %d is bad", blk);
- } else if (bi->block_state == YAFFS_BLOCK_STATE_EMPTY) {
- yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "Block empty ");
- dev->n_erased_blocks++;
- dev->n_free_chunks += dev->param.chunks_per_block;
- } else if (bi->block_state ==
- YAFFS_BLOCK_STATE_NEEDS_SCAN) {
- /* Determine the highest sequence number */
- if (seq_number >= YAFFS_LOWEST_SEQUENCE_NUMBER &&
- seq_number < YAFFS_HIGHEST_SEQUENCE_NUMBER) {
- block_index[n_to_scan].seq = seq_number;
- block_index[n_to_scan].block = blk;
- n_to_scan++;
- if (seq_number >= dev->seq_number)
- dev->seq_number = seq_number;
- } else {
- /* TODO: Nasty sequence number! */
- yaffs_trace(YAFFS_TRACE_SCAN,
- "Block scanning block %d has bad sequence number %d",
- blk, seq_number);
- }
- }
- bi++;
- }
-
- yaffs_trace(YAFFS_TRACE_ALWAYS, "%d blocks to be sorted...", n_to_scan);
-
- cond_resched();
-
- /* Sort the blocks by sequence number */
- sort(block_index, n_to_scan, sizeof(struct yaffs_block_index),
- yaffs2_ybicmp, NULL);
-
- cond_resched();
-
- yaffs_trace(YAFFS_TRACE_SCAN, "...done");
-
- /* Now scan the blocks looking at the data. */
- start_iter = 0;
- end_iter = n_to_scan - 1;
- yaffs_trace(YAFFS_TRACE_SCAN_DEBUG, "%d blocks to scan", n_to_scan);
-
- /* For each block.... backwards */
- for (block_iter = end_iter;
- !alloc_failed && block_iter >= start_iter;
- block_iter--) {
- /* Cooperative multitasking! This loop can run for so
- long that watchdog timers expire. */
- cond_resched();
-
- /* get the block to scan in the correct order */
- blk = block_index[block_iter].block;
- bi = yaffs_get_block_info(dev, blk);
-
- summary_available = yaffs_summary_read(dev, dev->sum_tags, blk);
-
- /* For each chunk in each block that needs scanning.... */
- found_chunks = 0;
- if (summary_available)
- c = dev->chunks_per_summary - 1;
- else
- c = dev->param.chunks_per_block - 1;
-
- for (/* c is already initialised */;
- !alloc_failed && c >= 0 &&
- (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN ||
- bi->block_state == YAFFS_BLOCK_STATE_ALLOCATING);
- c--) {
- /* Scan backwards...
- * Read the tags and decide what to do
- */
- if (yaffs2_scan_chunk(dev, bi, blk, c,
- &found_chunks, chunk_data,
- &hard_list, summary_available) ==
- YAFFS_FAIL)
- alloc_failed = 1;
- }
-
- if (bi->block_state == YAFFS_BLOCK_STATE_NEEDS_SCAN) {
- /* If we got this far while scanning, then the block
- * is fully allocated. */
- bi->block_state = YAFFS_BLOCK_STATE_FULL;
- }
-
- /* Now let's see if it was dirty */
- if (bi->pages_in_use == 0 &&
- !bi->has_shrink_hdr &&
- bi->block_state == YAFFS_BLOCK_STATE_FULL) {
- yaffs_block_became_dirty(dev, blk);
- }
- }
-
- yaffs_skip_rest_of_block(dev);
-
- if (alt_block_index)
- vfree(block_index);
- else
- kfree(block_index);
-
- /* Ok, we've done all the scanning.
- * Fix up the hard link chains.
- * We have scanned all the objects, now it's time to add these
- * hardlinks.
- */
- yaffs_link_fixup(dev, &hard_list);
-
- yaffs_release_temp_buffer(dev, chunk_data);
-
- if (alloc_failed)
- return YAFFS_FAIL;
-
- yaffs_trace(YAFFS_TRACE_SCAN, "yaffs2_scan_backwards ends");
-
- return YAFFS_OK;
-}
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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_YAFFS2_H__
-#define __YAFFS_YAFFS2_H__
-
-#include "yaffs_guts.h"
-
-void yaffs_calc_oldest_dirty_seq(struct yaffs_dev *dev);
-void yaffs2_find_oldest_dirty_seq(struct yaffs_dev *dev);
-void yaffs2_clear_oldest_dirty_seq(struct yaffs_dev *dev,
- struct yaffs_block_info *bi);
-void yaffs2_update_oldest_dirty_seq(struct yaffs_dev *dev, unsigned block_no,
- struct yaffs_block_info *bi);
-int yaffs_block_ok_for_gc(struct yaffs_dev *dev, struct yaffs_block_info *bi);
-u32 yaffs2_find_refresh_block(struct yaffs_dev *dev);
-int yaffs2_checkpt_required(struct yaffs_dev *dev);
-int yaffs_calc_checkpt_blocks_required(struct yaffs_dev *dev);
-
-void yaffs2_checkpt_invalidate(struct yaffs_dev *dev);
-int yaffs2_checkpt_save(struct yaffs_dev *dev);
-int yaffs2_checkpt_restore(struct yaffs_dev *dev);
-
-int yaffs2_handle_hole(struct yaffs_obj *obj, loff_t new_size);
-int yaffs2_scan_backwards(struct yaffs_dev *dev);
-
-#endif
+++ /dev/null
-/*
- * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
- *
- * Copyright (C) 2002-2011 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 __YPORTENV_H__
-#define __YPORTENV_H__
-
-/*
- * Define the MTD version in terms of Linux Kernel versions
- * This allows yaffs to be used independantly of the kernel
- * as well as with it.
- */
-
-#define MTD_VERSION(a, b, c) (((a) << 16) + ((b) << 8) + (c))
-
-#ifdef YAFFS_OUT_OF_TREE
-#include "moduleconfig.h"
-#endif
-
-#include <linux/version.h>
-#define MTD_VERSION_CODE LINUX_VERSION_CODE
-
-#if (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 19))
-#include <linux/config.h>
-#endif
-#include <linux/version.h>
-#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>
-#include <linux/list.h>
-#include <linux/types.h>
-#include <linux/fs.h>
-#include <linux/stat.h>
-#include <linux/sort.h>
-#include <linux/bitops.h>
-
-/* These type wrappings are used to support Unicode names in WinCE. */
-#define YCHAR char
-#define YUCHAR unsigned char
-#define _Y(x) x
-
-#define YAFFS_LOSTNFOUND_NAME "lost+found"
-#define YAFFS_LOSTNFOUND_PREFIX "obj"
-
-
-#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
-#define Y_TIME_CONVERT(x) (x).tv_sec
-#else
-#define Y_CURRENT_TIME CURRENT_TIME
-#define Y_TIME_CONVERT(x) (x)
-#endif
-
-#define compile_time_assertion(assertion) \
- ({ int x = __builtin_choose_expr(assertion, 0, (void)0); (void) x; })
-
-
-#define yaffs_printf(msk, fmt, ...) \
- printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__)
-
-#define yaffs_trace(msk, fmt, ...) do { \
- if (yaffs_trace_mask & (msk)) \
- printk(KERN_DEBUG "yaffs: " fmt "\n", ##__VA_ARGS__); \
-} while (0)
-
-
-#endif
+++ /dev/null
---- a/fs/Kconfig
-+++ b/fs/Kconfig
-@@ -39,6 +39,7 @@ source "fs/gfs2/Kconfig"
- source "fs/ocfs2/Kconfig"
- source "fs/btrfs/Kconfig"
- source "fs/nilfs2/Kconfig"
-+source "fs/yaffs2/Kconfig"
-
- endif # BLOCK
-
---- a/fs/Makefile
-+++ b/fs/Makefile
-@@ -126,3 +126,5 @@ obj-y += exofs/ # Multiple modules
- obj-$(CONFIG_CEPH_FS) += ceph/
- obj-$(CONFIG_PSTORE) += pstore/
- obj-$(CONFIG_EFIVAR_FS) += efivarfs/
-+obj-$(CONFIG_YAFFS_FS) += yaffs2/
-+
+++ /dev/null
-Subject: yaffs: fix compat tags handling
-
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
----
---- a/fs/yaffs2/yaffs_tagscompat.c
-+++ b/fs/yaffs2/yaffs_tagscompat.c
-@@ -17,7 +17,9 @@
- #include "yaffs_getblockinfo.h"
- #include "yaffs_trace.h"
-
-+#if 0
- static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
-+#endif
-
-
- /********** Tags ECC calculations *********/
-@@ -71,6 +73,7 @@ int yaffs_check_tags_ecc(struct yaffs_ta
- return 0;
- }
-
-+#if 0
- /********** Tags **********/
-
- static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
-@@ -379,3 +382,214 @@ void yaffs_tags_compat_install(struct ya
- if(!dev->tagger.mark_bad_fn)
- dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
- }
-+#else
-+
-+#include "yaffs_packedtags1.h"
-+
-+static int yaffs_tags_compat_write(struct yaffs_dev *dev,
-+ int nand_chunk,
-+ const u8 *data,
-+ const struct yaffs_ext_tags *tags)
-+{
-+ struct yaffs_packed_tags1 pt1;
-+ u8 tag_buf[9];
-+ int retval;
-+
-+ /* we assume that yaffs_packed_tags1 and yaffs_tags are compatible */
-+ compile_time_assertion(sizeof(struct yaffs_packed_tags1) == 12);
-+ compile_time_assertion(sizeof(struct yaffs_tags) == 8);
-+
-+ yaffs_pack_tags1(&pt1, tags);
-+ yaffs_calc_tags_ecc((struct yaffs_tags *)&pt1);
-+
-+ /* When deleting a chunk, the upper layer provides only skeletal
-+ * tags, one with is_deleted 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.
-+ */
-+ if (!dev->param.tags_9bytes) {
-+ if (tags->is_deleted) {
-+ memset(&pt1, 0xff, 8);
-+ /* clear delete status bit to indicate deleted */
-+ pt1.deleted = 0;
-+ }
-+ memcpy(tag_buf, &pt1, 8);
-+ } else {
-+ if (tags->is_deleted) {
-+ memset(tag_buf, 0xff, 8);
-+ tag_buf[8] = 0;
-+ } else {
-+ memcpy(tag_buf, &pt1, 8);
-+ tag_buf[8] = 0xff;
-+ }
-+ }
-+
-+ retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
-+ data,
-+ (data) ? dev->data_bytes_per_chunk : 0,
-+ tag_buf,
-+ (dev->param.tags_9bytes) ? 9 : 8);
-+
-+ return retval;
-+}
-+
-+/* Return with empty extended tags but add ecc_result.
-+ */
-+static int return_empty_tags(struct yaffs_ext_tags *tags,
-+ enum yaffs_ecc_result ecc_result,
-+ int retval)
-+{
-+ if (tags) {
-+ memset(tags, 0, sizeof(*tags));
-+ tags->ecc_result = ecc_result;
-+ }
-+
-+ return retval;
-+}
-+
-+static int yaffs_tags_compat_read(struct yaffs_dev *dev,
-+ int nand_chunk,
-+ u8 *data,
-+ struct yaffs_ext_tags *tags)
-+{
-+ struct yaffs_packed_tags1 pt1;
-+ enum yaffs_ecc_result ecc_result;
-+ int retval;
-+ int deleted;
-+ u8 tag_buf[9];
-+
-+ retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-+ data, dev->param.total_bytes_per_chunk,
-+ tag_buf,
-+ (dev->param.tags_9bytes) ? 9 : 8,
-+ &ecc_result);
-+
-+ switch (ecc_result) {
-+ case YAFFS_ECC_RESULT_NO_ERROR:
-+ case YAFFS_ECC_RESULT_FIXED:
-+ break;
-+
-+ case YAFFS_ECC_RESULT_UNFIXED:
-+ default:
-+ return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED, 0);
-+ tags->block_bad = dev->drv.drv_check_bad_fn(dev, nand_chunk);
-+ return YAFFS_FAIL;
-+ }
-+
-+ /* Check for a blank/erased chunk. */
-+ if (yaffs_check_ff(tag_buf, 8)) {
-+ /* when blank, upper layers want ecc_result to be <= NO_ERROR */
-+ return return_empty_tags(tags, YAFFS_ECC_RESULT_NO_ERROR,
-+ YAFFS_OK);
-+ }
-+
-+ memcpy(&pt1, tag_buf, 8);
-+
-+ if (!dev->param.tags_9bytes) {
-+ /* 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 {
-+ deleted = (hweight8(tag_buf[8]) < 7) ? 1 : 0;
-+ }
-+
-+ /* Check the packed tags mini-ECC and correct if necessary/possible. */
-+ retval = yaffs_check_tags_ecc((struct yaffs_tags *)&pt1);
-+ switch (retval) {
-+ case 0:
-+ /* no tags error, use MTD result */
-+ break;
-+ case 1:
-+ /* recovered tags-ECC error */
-+ dev->n_tags_ecc_fixed++;
-+ if (ecc_result == YAFFS_ECC_RESULT_NO_ERROR)
-+ ecc_result = YAFFS_ECC_RESULT_FIXED;
-+ break;
-+ default:
-+ /* unrecovered tags-ECC error */
-+ dev->n_tags_ecc_unfixed++;
-+ return return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED,
-+ YAFFS_FAIL);
-+ }
-+
-+ /* Unpack the tags to extended form and set ECC result.
-+ * [set should_be_ff just to keep yaffs_unpack_tags1 happy]
-+ */
-+ pt1.should_be_ff = 0xffffffff;
-+ yaffs_unpack_tags1(tags, &pt1);
-+ tags->ecc_result = ecc_result;
-+
-+ /* Set deleted state */
-+ tags->is_deleted = deleted;
-+ return YAFFS_OK;
-+}
-+
-+static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no)
-+{
-+ return dev->drv.drv_mark_bad_fn(dev, block_no);
-+}
-+
-+static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
-+ int block_no,
-+ enum yaffs_block_state *state,
-+ u32 *seq_number)
-+{
-+ struct yaffs_ext_tags tags;
-+ int retval;
-+
-+ yaffs_trace(YAFFS_TRACE_MTD, "%s %d", __func__, block_no);
-+
-+ *seq_number = 0;
-+
-+ retval = dev->drv.drv_check_bad_fn(dev, block_no);
-+ if (retval == YAFFS_FAIL) {
-+ *state = YAFFS_BLOCK_STATE_DEAD;
-+ goto out;
-+ }
-+
-+ yaffs_tags_compat_read(dev, block_no * dev->param.chunks_per_block,
-+ NULL, &tags);
-+
-+ if (tags.ecc_result != YAFFS_ECC_RESULT_NO_ERROR) {
-+ yaffs_trace(YAFFS_TRACE_MTD, "block %d is marked bad",
-+ block_no);
-+ *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+ } else if (tags.chunk_used) {
-+ *seq_number = tags.seq_number;
-+ *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+ } else {
-+ *state = YAFFS_BLOCK_STATE_EMPTY;
-+ }
-+
-+ retval = YAFFS_OK;
-+
-+out:
-+ yaffs_trace(YAFFS_TRACE_MTD,
-+ "block query returns seq %u state %d",
-+ *seq_number, *state);
-+
-+ return retval;
-+}
-+
-+void yaffs_tags_compat_install(struct yaffs_dev *dev)
-+{
-+ if (dev->param.is_yaffs2)
-+ return;
-+
-+ if (!dev->tagger.write_chunk_tags_fn)
-+ dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_write;
-+
-+ if (!dev->tagger.read_chunk_tags_fn)
-+ dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_read;
-+
-+ if (!dev->tagger.query_block_fn)
-+ dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
-+
-+ if (!dev->tagger.mark_bad_fn)
-+ dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
-+}
-+#endif
+++ /dev/null
-Subject: yaffs: add support for tags-9bytes mount option
-
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
----
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -2644,6 +2644,7 @@ static const struct super_operations yaf
-
- struct yaffs_options {
- int inband_tags;
-+ int tags_9bytes;
- int skip_checkpoint_read;
- int skip_checkpoint_write;
- int no_cache;
-@@ -2683,6 +2684,8 @@ static int yaffs_parse_options(struct ya
-
- if (!strcmp(cur_opt, "inband-tags")) {
- options->inband_tags = 1;
-+ } else if (!strcmp(cur_opt, "tags-9bytes")) {
-+ options->tags_9bytes = 1;
- } else if (!strcmp(cur_opt, "tags-ecc-off")) {
- options->tags_ecc_on = 0;
- options->tags_ecc_overridden = 1;
-@@ -2756,7 +2759,6 @@ static struct super_block *yaffs_interna
- struct yaffs_param *param;
-
- int read_only = 0;
-- int inband_tags = 0;
-
- struct yaffs_options options;
-
-@@ -2796,6 +2798,9 @@ static struct super_block *yaffs_interna
-
- memset(&options, 0, sizeof(options));
-
-+ if (IS_ENABLED(CONFIG_YAFFS_9BYTE_TAGS))
-+ options.tags_9bytes = 1;
-+
- if (yaffs_parse_options(&options, data_str)) {
- /* Option parsing failed */
- return NULL;
-@@ -2829,17 +2834,22 @@ static struct super_block *yaffs_interna
- }
-
- /* Added NCB 26/5/2006 for completeness */
-- if (yaffs_version == 2 && !options.inband_tags
-- && WRITE_SIZE(mtd) == 512) {
-+ if (yaffs_version == 2 &&
-+ (!options.inband_tags || options.tags_9bytes) &&
-+ WRITE_SIZE(mtd) == 512) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
- yaffs_version = 1;
- }
-
-- if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
-- options.inband_tags)
-- inband_tags = 1;
-+ if (yaffs_version == 2 &&
-+ mtd->oobavail < sizeof(struct yaffs_packed_tags2)) {
-+ yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting inband tags");
-+ options.inband_tags = 1;
-+ }
-
-- if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
-+ err = yaffs_verify_mtd(mtd, yaffs_version, options.inband_tags,
-+ options.tags_9bytes);
-+ if (err < 0)
- return NULL;
-
- /* OK, so if we got here, we have an MTD that's NAND and looks
-@@ -2896,7 +2906,8 @@ static struct super_block *yaffs_interna
-
- param->n_reserved_blocks = 5;
- param->n_caches = (options.no_cache) ? 0 : 10;
-- param->inband_tags = inband_tags;
-+ param->inband_tags = options.inband_tags;
-+ param->tags_9bytes = options.tags_9bytes;
-
- param->enable_xattr = 1;
- if (options.lazy_loading_overridden)
---- a/fs/yaffs2/yaffs_mtdif.c
-+++ b/fs/yaffs2/yaffs_mtdif.c
-@@ -278,7 +278,8 @@ struct mtd_info * yaffs_get_mtd_device(d
- return mtd;
- }
-
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+ int tags_9bytes)
- {
- if (yaffs_version == 2) {
- if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
-@@ -297,6 +298,12 @@ int yaffs_verify_mtd(struct mtd_info *mt
- );
- return -1;
- }
-+
-+ if (tags_9bytes && mtd->oobavail < 9) {
-+ yaffs_trace(YAFFS_TRACE_ALWAYS,
-+ "MTD device does not support 9-byte tags");
-+ return -1;
-+ }
- }
-
- return 0;
---- a/fs/yaffs2/yaffs_mtdif.h
-+++ b/fs/yaffs2/yaffs_mtdif.h
-@@ -21,5 +21,6 @@
- void yaffs_mtd_drv_install(struct yaffs_dev *dev);
- struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
- void yaffs_put_mtd_device(struct mtd_info *mtd);
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+ int tags_9bytes);
- #endif
+++ /dev/null
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -774,7 +774,21 @@ static int yaffs_sync_object(struct file
- }
-
-
--#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0))
-+static const struct file_operations yaffs_file_operations = {
-+ .read = new_sync_read,
-+ .read_iter = generic_file_read_iter,
-+ .write = new_sync_write,
-+ .write_iter = generic_file_write_iter,
-+ .mmap = generic_file_mmap,
-+ .flush = yaffs_file_flush,
-+ .fsync = yaffs_sync_object,
-+ .splice_read = generic_file_splice_read,
-+ .splice_write = iter_file_splice_write,
-+ .llseek = generic_file_llseek,
-+};
-+
-+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
- static const struct file_operations yaffs_file_operations = {
- .read = do_sync_read,
- .write = do_sync_write,
--- a/fs/Kconfig
+++ b/fs/Kconfig
-@@ -62,6 +62,11 @@ config FILE_LOCKING
+@@ -61,6 +61,11 @@ config FILE_LOCKING
for filesystems like NFS and for the flock() system
call. Disabling this option saves about 11k.
+++ /dev/null
---- a/fs/Kconfig
-+++ b/fs/Kconfig
-@@ -30,6 +30,7 @@ source "fs/ocfs2/Kconfig"
- source "fs/btrfs/Kconfig"
- source "fs/nilfs2/Kconfig"
- source "fs/f2fs/Kconfig"
-+source "fs/yaffs2/Kconfig"
-
- config FS_DAX
- bool "Direct Access (DAX) support"
---- a/fs/Makefile
-+++ b/fs/Makefile
-@@ -126,3 +126,5 @@ obj-y += exofs/ # Multiple modules
- obj-$(CONFIG_CEPH_FS) += ceph/
- obj-$(CONFIG_PSTORE) += pstore/
- obj-$(CONFIG_EFIVAR_FS) += efivarfs/
-+obj-$(CONFIG_YAFFS_FS) += yaffs2/
-+
+++ /dev/null
-Subject: yaffs: fix compat tags handling
-
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
----
---- a/fs/yaffs2/yaffs_tagscompat.c
-+++ b/fs/yaffs2/yaffs_tagscompat.c
-@@ -17,7 +17,9 @@
- #include "yaffs_getblockinfo.h"
- #include "yaffs_trace.h"
-
-+#if 0
- static void yaffs_handle_rd_data_error(struct yaffs_dev *dev, int nand_chunk);
-+#endif
-
-
- /********** Tags ECC calculations *********/
-@@ -71,6 +73,7 @@ int yaffs_check_tags_ecc(struct yaffs_ta
- return 0;
- }
-
-+#if 0
- /********** Tags **********/
-
- static void yaffs_load_tags_to_spare(struct yaffs_spare *spare_ptr,
-@@ -379,3 +382,214 @@ void yaffs_tags_compat_install(struct ya
- if(!dev->tagger.mark_bad_fn)
- dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
- }
-+#else
-+
-+#include "yaffs_packedtags1.h"
-+
-+static int yaffs_tags_compat_write(struct yaffs_dev *dev,
-+ int nand_chunk,
-+ const u8 *data,
-+ const struct yaffs_ext_tags *tags)
-+{
-+ struct yaffs_packed_tags1 pt1;
-+ u8 tag_buf[9];
-+ int retval;
-+
-+ /* we assume that yaffs_packed_tags1 and yaffs_tags are compatible */
-+ compile_time_assertion(sizeof(struct yaffs_packed_tags1) == 12);
-+ compile_time_assertion(sizeof(struct yaffs_tags) == 8);
-+
-+ yaffs_pack_tags1(&pt1, tags);
-+ yaffs_calc_tags_ecc((struct yaffs_tags *)&pt1);
-+
-+ /* When deleting a chunk, the upper layer provides only skeletal
-+ * tags, one with is_deleted 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.
-+ */
-+ if (!dev->param.tags_9bytes) {
-+ if (tags->is_deleted) {
-+ memset(&pt1, 0xff, 8);
-+ /* clear delete status bit to indicate deleted */
-+ pt1.deleted = 0;
-+ }
-+ memcpy(tag_buf, &pt1, 8);
-+ } else {
-+ if (tags->is_deleted) {
-+ memset(tag_buf, 0xff, 8);
-+ tag_buf[8] = 0;
-+ } else {
-+ memcpy(tag_buf, &pt1, 8);
-+ tag_buf[8] = 0xff;
-+ }
-+ }
-+
-+ retval = dev->drv.drv_write_chunk_fn(dev, nand_chunk,
-+ data,
-+ (data) ? dev->data_bytes_per_chunk : 0,
-+ tag_buf,
-+ (dev->param.tags_9bytes) ? 9 : 8);
-+
-+ return retval;
-+}
-+
-+/* Return with empty extended tags but add ecc_result.
-+ */
-+static int return_empty_tags(struct yaffs_ext_tags *tags,
-+ enum yaffs_ecc_result ecc_result,
-+ int retval)
-+{
-+ if (tags) {
-+ memset(tags, 0, sizeof(*tags));
-+ tags->ecc_result = ecc_result;
-+ }
-+
-+ return retval;
-+}
-+
-+static int yaffs_tags_compat_read(struct yaffs_dev *dev,
-+ int nand_chunk,
-+ u8 *data,
-+ struct yaffs_ext_tags *tags)
-+{
-+ struct yaffs_packed_tags1 pt1;
-+ enum yaffs_ecc_result ecc_result;
-+ int retval;
-+ int deleted;
-+ u8 tag_buf[9];
-+
-+ retval = dev->drv.drv_read_chunk_fn(dev, nand_chunk,
-+ data, dev->param.total_bytes_per_chunk,
-+ tag_buf,
-+ (dev->param.tags_9bytes) ? 9 : 8,
-+ &ecc_result);
-+
-+ switch (ecc_result) {
-+ case YAFFS_ECC_RESULT_NO_ERROR:
-+ case YAFFS_ECC_RESULT_FIXED:
-+ break;
-+
-+ case YAFFS_ECC_RESULT_UNFIXED:
-+ default:
-+ return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED, 0);
-+ tags->block_bad = dev->drv.drv_check_bad_fn(dev, nand_chunk);
-+ return YAFFS_FAIL;
-+ }
-+
-+ /* Check for a blank/erased chunk. */
-+ if (yaffs_check_ff(tag_buf, 8)) {
-+ /* when blank, upper layers want ecc_result to be <= NO_ERROR */
-+ return return_empty_tags(tags, YAFFS_ECC_RESULT_NO_ERROR,
-+ YAFFS_OK);
-+ }
-+
-+ memcpy(&pt1, tag_buf, 8);
-+
-+ if (!dev->param.tags_9bytes) {
-+ /* 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 {
-+ deleted = (hweight8(tag_buf[8]) < 7) ? 1 : 0;
-+ }
-+
-+ /* Check the packed tags mini-ECC and correct if necessary/possible. */
-+ retval = yaffs_check_tags_ecc((struct yaffs_tags *)&pt1);
-+ switch (retval) {
-+ case 0:
-+ /* no tags error, use MTD result */
-+ break;
-+ case 1:
-+ /* recovered tags-ECC error */
-+ dev->n_tags_ecc_fixed++;
-+ if (ecc_result == YAFFS_ECC_RESULT_NO_ERROR)
-+ ecc_result = YAFFS_ECC_RESULT_FIXED;
-+ break;
-+ default:
-+ /* unrecovered tags-ECC error */
-+ dev->n_tags_ecc_unfixed++;
-+ return return_empty_tags(tags, YAFFS_ECC_RESULT_UNFIXED,
-+ YAFFS_FAIL);
-+ }
-+
-+ /* Unpack the tags to extended form and set ECC result.
-+ * [set should_be_ff just to keep yaffs_unpack_tags1 happy]
-+ */
-+ pt1.should_be_ff = 0xffffffff;
-+ yaffs_unpack_tags1(tags, &pt1);
-+ tags->ecc_result = ecc_result;
-+
-+ /* Set deleted state */
-+ tags->is_deleted = deleted;
-+ return YAFFS_OK;
-+}
-+
-+static int yaffs_tags_compat_mark_bad(struct yaffs_dev *dev, int block_no)
-+{
-+ return dev->drv.drv_mark_bad_fn(dev, block_no);
-+}
-+
-+static int yaffs_tags_compat_query_block(struct yaffs_dev *dev,
-+ int block_no,
-+ enum yaffs_block_state *state,
-+ u32 *seq_number)
-+{
-+ struct yaffs_ext_tags tags;
-+ int retval;
-+
-+ yaffs_trace(YAFFS_TRACE_MTD, "%s %d", __func__, block_no);
-+
-+ *seq_number = 0;
-+
-+ retval = dev->drv.drv_check_bad_fn(dev, block_no);
-+ if (retval == YAFFS_FAIL) {
-+ *state = YAFFS_BLOCK_STATE_DEAD;
-+ goto out;
-+ }
-+
-+ yaffs_tags_compat_read(dev, block_no * dev->param.chunks_per_block,
-+ NULL, &tags);
-+
-+ if (tags.ecc_result != YAFFS_ECC_RESULT_NO_ERROR) {
-+ yaffs_trace(YAFFS_TRACE_MTD, "block %d is marked bad",
-+ block_no);
-+ *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+ } else if (tags.chunk_used) {
-+ *seq_number = tags.seq_number;
-+ *state = YAFFS_BLOCK_STATE_NEEDS_SCAN;
-+ } else {
-+ *state = YAFFS_BLOCK_STATE_EMPTY;
-+ }
-+
-+ retval = YAFFS_OK;
-+
-+out:
-+ yaffs_trace(YAFFS_TRACE_MTD,
-+ "block query returns seq %u state %d",
-+ *seq_number, *state);
-+
-+ return retval;
-+}
-+
-+void yaffs_tags_compat_install(struct yaffs_dev *dev)
-+{
-+ if (dev->param.is_yaffs2)
-+ return;
-+
-+ if (!dev->tagger.write_chunk_tags_fn)
-+ dev->tagger.write_chunk_tags_fn = yaffs_tags_compat_write;
-+
-+ if (!dev->tagger.read_chunk_tags_fn)
-+ dev->tagger.read_chunk_tags_fn = yaffs_tags_compat_read;
-+
-+ if (!dev->tagger.query_block_fn)
-+ dev->tagger.query_block_fn = yaffs_tags_compat_query_block;
-+
-+ if (!dev->tagger.mark_bad_fn)
-+ dev->tagger.mark_bad_fn = yaffs_tags_compat_mark_bad;
-+}
-+#endif
+++ /dev/null
-Subject: yaffs: add support for tags-9bytes mount option
-
-Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
----
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -2644,6 +2644,7 @@ static const struct super_operations yaf
-
- struct yaffs_options {
- int inband_tags;
-+ int tags_9bytes;
- int skip_checkpoint_read;
- int skip_checkpoint_write;
- int no_cache;
-@@ -2683,6 +2684,8 @@ static int yaffs_parse_options(struct ya
-
- if (!strcmp(cur_opt, "inband-tags")) {
- options->inband_tags = 1;
-+ } else if (!strcmp(cur_opt, "tags-9bytes")) {
-+ options->tags_9bytes = 1;
- } else if (!strcmp(cur_opt, "tags-ecc-off")) {
- options->tags_ecc_on = 0;
- options->tags_ecc_overridden = 1;
-@@ -2756,7 +2759,6 @@ static struct super_block *yaffs_interna
- struct yaffs_param *param;
-
- int read_only = 0;
-- int inband_tags = 0;
-
- struct yaffs_options options;
-
-@@ -2796,6 +2798,9 @@ static struct super_block *yaffs_interna
-
- memset(&options, 0, sizeof(options));
-
-+ if (IS_ENABLED(CONFIG_YAFFS_9BYTE_TAGS))
-+ options.tags_9bytes = 1;
-+
- if (yaffs_parse_options(&options, data_str)) {
- /* Option parsing failed */
- return NULL;
-@@ -2829,17 +2834,22 @@ static struct super_block *yaffs_interna
- }
-
- /* Added NCB 26/5/2006 for completeness */
-- if (yaffs_version == 2 && !options.inband_tags
-- && WRITE_SIZE(mtd) == 512) {
-+ if (yaffs_version == 2 &&
-+ (!options.inband_tags || options.tags_9bytes) &&
-+ WRITE_SIZE(mtd) == 512) {
- yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting yaffs1");
- yaffs_version = 1;
- }
-
-- if (mtd->oobavail < sizeof(struct yaffs_packed_tags2) ||
-- options.inband_tags)
-- inband_tags = 1;
-+ if (yaffs_version == 2 &&
-+ mtd->oobavail < sizeof(struct yaffs_packed_tags2)) {
-+ yaffs_trace(YAFFS_TRACE_ALWAYS, "auto selecting inband tags");
-+ options.inband_tags = 1;
-+ }
-
-- if(yaffs_verify_mtd(mtd, yaffs_version, inband_tags) < 0)
-+ err = yaffs_verify_mtd(mtd, yaffs_version, options.inband_tags,
-+ options.tags_9bytes);
-+ if (err < 0)
- return NULL;
-
- /* OK, so if we got here, we have an MTD that's NAND and looks
-@@ -2896,7 +2906,8 @@ static struct super_block *yaffs_interna
-
- param->n_reserved_blocks = 5;
- param->n_caches = (options.no_cache) ? 0 : 10;
-- param->inband_tags = inband_tags;
-+ param->inband_tags = options.inband_tags;
-+ param->tags_9bytes = options.tags_9bytes;
-
- param->enable_xattr = 1;
- if (options.lazy_loading_overridden)
---- a/fs/yaffs2/yaffs_mtdif.c
-+++ b/fs/yaffs2/yaffs_mtdif.c
-@@ -278,7 +278,8 @@ struct mtd_info * yaffs_get_mtd_device(d
- return mtd;
- }
-
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags)
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+ int tags_9bytes)
- {
- if (yaffs_version == 2) {
- if ((WRITE_SIZE(mtd) < YAFFS_MIN_YAFFS2_CHUNK_SIZE ||
-@@ -297,6 +298,12 @@ int yaffs_verify_mtd(struct mtd_info *mt
- );
- return -1;
- }
-+
-+ if (tags_9bytes && mtd->oobavail < 9) {
-+ yaffs_trace(YAFFS_TRACE_ALWAYS,
-+ "MTD device does not support 9-byte tags");
-+ return -1;
-+ }
- }
-
- return 0;
---- a/fs/yaffs2/yaffs_mtdif.h
-+++ b/fs/yaffs2/yaffs_mtdif.h
-@@ -21,5 +21,6 @@
- void yaffs_mtd_drv_install(struct yaffs_dev *dev);
- struct mtd_info * yaffs_get_mtd_device(dev_t sdev);
- void yaffs_put_mtd_device(struct mtd_info *mtd);
--int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags);
-+int yaffs_verify_mtd(struct mtd_info *mtd, int yaffs_version, int inband_tags,
-+ int tags_9bytes);
- #endif
+++ /dev/null
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -774,7 +774,25 @@ static int yaffs_sync_object(struct file
- }
-
-
--#if (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
-+#if (LINUX_VERSION_CODE >= KERNEL_VERSION(3, 16, 0))
-+static const struct file_operations yaffs_file_operations = {
-+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0))
-+ .read = new_sync_read,
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0) */
-+ .read_iter = generic_file_read_iter,
-+#if (LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0))
-+ .write = new_sync_write,
-+#endif /* LINUX_VERSION_CODE < KERNEL_VERSION(4, 1, 0) */
-+ .write_iter = generic_file_write_iter,
-+ .mmap = generic_file_mmap,
-+ .flush = yaffs_file_flush,
-+ .fsync = yaffs_sync_object,
-+ .splice_read = generic_file_splice_read,
-+ .splice_write = iter_file_splice_write,
-+ .llseek = generic_file_llseek,
-+};
-+
-+#elif (LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 22))
- static const struct file_operations yaffs_file_operations = {
- .read = do_sync_read,
- .write = do_sync_write,
+++ /dev/null
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -283,7 +283,7 @@ static int yaffs_readpage_nolock(struct
- (long long)pos,
- (unsigned)PAGE_CACHE_SIZE);
-
-- obj = yaffs_dentry_to_obj(f->f_dentry);
-+ obj = yaffs_dentry_to_obj(f->f_path.dentry);
-
- dev = obj->my_dev;
-
-@@ -481,7 +481,7 @@ static ssize_t yaffs_hold_space(struct f
-
- int n_free_chunks;
-
-- obj = yaffs_dentry_to_obj(f->f_dentry);
-+ obj = yaffs_dentry_to_obj(f->f_path.dentry);
-
- dev = obj->my_dev;
-
-@@ -499,7 +499,7 @@ static void yaffs_release_space(struct f
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
-
-- obj = yaffs_dentry_to_obj(f->f_dentry);
-+ obj = yaffs_dentry_to_obj(f->f_path.dentry);
-
- dev = obj->my_dev;
-
-@@ -591,7 +591,7 @@ static ssize_t yaffs_file_write(struct f
- struct inode *inode;
- struct yaffs_dev *dev;
-
-- obj = yaffs_dentry_to_obj(f->f_dentry);
-+ obj = yaffs_dentry_to_obj(f->f_path.dentry);
-
- if (!obj) {
- yaffs_trace(YAFFS_TRACE_OS,
-@@ -603,7 +603,7 @@ static ssize_t yaffs_file_write(struct f
-
- yaffs_gross_lock(dev);
-
-- inode = f->f_dentry->d_inode;
-+ inode = f->f_path.dentry->d_inode;
-
- if (!S_ISBLK(inode->i_mode) && f->f_flags & O_APPEND)
- ipos = inode->i_size;
-@@ -727,7 +727,7 @@ static int yaffs_file_flush(struct file
- static int yaffs_file_flush(struct file *file)
- #endif
- {
-- struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_dentry);
-+ struct yaffs_obj *obj = yaffs_dentry_to_obj(file->f_path.dentry);
-
- struct yaffs_dev *dev = obj->my_dev;
-
-@@ -1734,7 +1734,7 @@ static int yaffs_iterate(struct file *f,
-
- char name[YAFFS_MAX_NAME_LENGTH + 1];
-
-- obj = yaffs_dentry_to_obj(f->f_dentry);
-+ obj = yaffs_dentry_to_obj(f->f_path.dentry);
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-@@ -1798,14 +1798,14 @@ static int yaffs_readdir(struct file *f,
- struct yaffs_obj *obj;
- struct yaffs_dev *dev;
- struct yaffs_search_context *sc;
-- struct inode *inode = f->f_dentry->d_inode;
-+ struct inode *inode = f->f_path.dentry->d_inode;
- unsigned long offset, curoffs;
- struct yaffs_obj *l;
- int ret_val = 0;
-
- char name[YAFFS_MAX_NAME_LENGTH + 1];
-
-- obj = yaffs_dentry_to_obj(f->f_dentry);
-+ obj = yaffs_dentry_to_obj(f->f_path.dentry);
- dev = obj->my_dev;
-
- yaffs_gross_lock(dev);
-@@ -1839,10 +1839,10 @@ static int yaffs_readdir(struct file *f,
- if (offset == 1) {
- yaffs_trace(YAFFS_TRACE_OS,
- "yaffs_readdir: entry .. ino %d",
-- (int)f->f_dentry->d_parent->d_inode->i_ino);
-+ (int)f->f_path.dentry->d_parent->d_inode->i_ino);
- yaffs_gross_unlock(dev);
- if (filldir(dirent, "..", 2, offset,
-- f->f_dentry->d_parent->d_inode->i_ino,
-+ f->f_path.dentry->d_parent->d_inode->i_ino,
- DT_DIR) < 0) {
- yaffs_gross_lock(dev);
- goto out;
+++ /dev/null
-From d4eb3ab036f8c37c5bc5f45ad0fa4dc34b7228c8 Mon Sep 17 00:00:00 2001
-From: Kevin Hao <kexin.hao@windriver.com>
-Date: Wed, 24 Feb 2016 14:37:13 +0800
-Subject: [PATCH 3/3] yaffs2: using new ->follow_link() and ->put_link()
- calling conventions
-
-As what we did in commit 680baacbca69 ("new ->follow_link() and
-->put_link() calling conventions").
-
-Signed-off-by: Kevin Hao <kexin.hao@windriver.com>
-Signed-off-by: Bruce Ashfield <bruce.ashfield@windriver.com>
----
- fs/yaffs2/yaffs_vfs.c | 8 ++++----
- 1 file changed, 4 insertions(+), 4 deletions(-)
-
---- a/fs/yaffs2/yaffs_vfs.c
-+++ b/fs/yaffs2/yaffs_vfs.c
-@@ -1060,7 +1060,7 @@ static int yaffs_readlink(struct dentry
- }
-
- #if (YAFFS_NEW_FOLLOW_LINK == 1)
--static void *yaffs_follow_link(struct dentry *dentry, struct nameidata *nd)
-+static const char *yaffs_follow_link(struct dentry *dentry, void **cookie)
- {
- void *ret;
- #else
-@@ -1082,7 +1082,7 @@ static int yaffs_follow_link(struct dent
- goto out;
- }
- #if (YAFFS_NEW_FOLLOW_LINK == 1)
-- nd_set_link(nd, alias);
-+ *cookie = alias;
- ret = alias;
- out:
- if (ret_int)
-@@ -1114,9 +1114,9 @@ static void yaffs_put_inode(struct inode
- #endif
-
- #if (YAFFS_NEW_FOLLOW_LINK == 1)
--void yaffs_put_link(struct dentry *dentry, struct nameidata *nd, void *alias)
-+void yaffs_put_link(struct inode *inode, void *cookie)
- {
-- kfree(alias);
-+ kfree(cookie);
- }
- #endif
-
--- a/fs/Kconfig
+++ b/fs/Kconfig
-@@ -74,6 +74,11 @@ config FILE_LOCKING
+@@ -73,6 +73,11 @@ config FILE_LOCKING
for filesystems like NFS and for the flock() system
call. Disabling this option saves about 11k.
projects / openwrt / staging / yousong.git / commitdiff