target/linux/generic-2.6/files/fs/yaffs2/devextras.h

   1 /*
   2  * YAFFS: Yet another Flash File System . A NAND-flash specific file system.
   3  *
   4  * Copyright (C) 2002-2007 Aleph One Ltd.
   5  *   for Toby Churchill Ltd and Brightstar Engineering
   6  *
   7  * Created by Charles Manning <charles@aleph1.co.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU Lesser General Public License version 2.1 as
  11  * published by the Free Software Foundation.
  12  *
  13  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  14  */
  15
  16 /*
  17  * This file is just holds extra declarations of macros that would normally
  18  * be providesd in the Linux kernel. These macros have been written from
  19  * scratch but are functionally equivalent to the Linux ones.
  20  *
  21  */
  22
  23 #ifndef __EXTRAS_H__
  24 #define __EXTRAS_H__
  25
  26
  27 #if !(defined __KERNEL__)
  28
  29 /* Definition of types */
  30 typedef unsigned char __u8;
  31 typedef unsigned short __u16;
  32 typedef unsigned __u32;
  33
  34 #endif
  35
  36 /*
  37  * This is a simple doubly linked list implementation that matches the
  38  * way the Linux kernel doubly linked list implementation works.
  39  */
  40
  41 struct ylist_head {
  42         struct ylist_head *next; /* next in chain */
  43         struct ylist_head *prev; /* previous in chain */
  44 };
  45
  46
  47 /* Initialise a list head to an empty list */
  48 #define YINIT_LIST_HEAD(p) \
  49 do { \
  50  (p)->next = (p);\
  51  (p)->prev = (p); \
  52 } while(0)
  53
  54
  55 /* Add an element to a list */
  56 static __inline__ void ylist_add(struct ylist_head *newEntry,
  57                                  struct ylist_head *list)
  58 {
  59         struct ylist_head *listNext = list->next;
  60
  61         list->next = newEntry;
  62         newEntry->prev = list;
  63         newEntry->next = listNext;
  64         listNext->prev = newEntry;
  65
  66 }
  67
  68
  69 /* Take an element out of its current list, with or without
  70  * reinitialising the links.of the entry*/
  71 static __inline__ void ylist_del(struct ylist_head *entry)
  72 {
  73         struct ylist_head *listNext = entry->next;
  74         struct ylist_head *listPrev = entry->prev;
  75
  76         listNext->prev = listPrev;
  77         listPrev->next = listNext;
  78
  79 }
  80
  81 static __inline__ void ylist_del_init(struct ylist_head *entry)
  82 {
  83         ylist_del(entry);
  84         entry->next = entry->prev = entry;
  85 }
  86
  87
  88 /* Test if the list is empty */
  89 static __inline__ int ylist_empty(struct ylist_head *entry)
  90 {
  91         return (entry->next == entry);
  92 }
  93
  94
  95 /* ylist_entry takes a pointer to a list entry and offsets it to that
  96  * we can find a pointer to the object it is embedded in.
  97  */
  98
  99
 100 #define ylist_entry(entry, type, member) \
 101         ((type *)((char *)(entry)-(unsigned long)(&((type *)NULL)->member)))
 102
 103
 104 /* ylist_for_each and list_for_each_safe  iterate over lists.
 105  * ylist_for_each_safe uses temporary storage to make the list delete safe
 106  */
 107
 108 #define ylist_for_each(itervar, list) \
 109         for (itervar = (list)->next; itervar != (list); itervar = itervar->next )
 110
 111 #define ylist_for_each_safe(itervar,saveVar, list) \
 112         for (itervar = (list)->next, saveVar = (list)->next->next; itervar != (list); \
 113          itervar = saveVar, saveVar = saveVar->next)
 114
 115
 116 #if !(defined __KERNEL__)
 117
 118
 119 #ifndef WIN32
 120 #include <sys/stat.h>
 121 #endif
 122
 123
 124 #ifdef CONFIG_YAFFS_PROVIDE_DEFS
 125 /* File types */
 126
 127
 128 #define DT_UNKNOWN      0
 129 #define DT_FIFO         1
 130 #define DT_CHR          2
 131 #define DT_DIR          4
 132 #define DT_BLK          6
 133 #define DT_REG          8
 134 #define DT_LNK          10
 135 #define DT_SOCK         12
 136 #define DT_WHT          14
 137
 138
 139 #ifndef WIN32
 140 #include <sys/stat.h>
 141 #endif
 142
 143 /*
 144  * Attribute flags.
 145  */
 146 #define ATTR_MODE       1
 147 #define ATTR_UID        2
 148 #define ATTR_GID        4
 149 #define ATTR_SIZE       8
 150 #define ATTR_ATIME      16
 151 #define ATTR_MTIME      32
 152 #define ATTR_CTIME      64
 153
 154
 155 struct iattr {
 156         unsigned int ia_valid;
 157         unsigned ia_mode;
 158         unsigned ia_uid;
 159         unsigned ia_gid;
 160         unsigned ia_size;
 161         unsigned ia_atime;
 162         unsigned ia_mtime;
 163         unsigned ia_ctime;
 164         unsigned int ia_attr_flags;
 165 };
 166
 167 #endif
 168
 169
 170 #define KERN_DEBUG
 171
 172 #else
 173
 174 #include <linux/types.h>
 175 #include <linux/fs.h>
 176 #include <linux/stat.h>
 177
 178 #endif
 179
 180
 181 #endif