LXR uboot/fs/jffs2/summary.h

   1/*
   2 * JFFS2 -- Journalling Flash File System, Version 2.
   3 *
   4 * Copyright © 2004  Ferenc Havasi <havasi@inf.u-szeged.hu>,
   5 *                   Zoltan Sogor <weth@inf.u-szeged.hu>,
   6 *                   Patrik Kluba <pajko@halom.u-szeged.hu>,
   7 *                   University of Szeged, Hungary
   8 *
   9 * For licensing information, see the file 'LICENCE' in this directory.
  10 *
  11 */
  12
  13#ifndef JFFS2_SUMMARY_H
  14#define JFFS2_SUMMARY_H
  15
  16#define BLK_STATE_ALLFF         0
  17#define BLK_STATE_CLEAN         1
  18#define BLK_STATE_PARTDIRTY     2
  19#define BLK_STATE_CLEANMARKER   3
  20#define BLK_STATE_ALLDIRTY      4
  21#define BLK_STATE_BADBLOCK      5
  22
  23#define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
  24#define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
  25#define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
  26#define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
  27#define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
  28
  29/* Summary structures used on flash */
  30
  31struct jffs2_sum_unknown_flash
  32{
  33        __u16 nodetype; /* node type */
  34};
  35
  36struct jffs2_sum_inode_flash
  37{
  38        __u16 nodetype; /* node type */
  39        __u32 inode;            /* inode number */
  40        __u32 version;  /* inode version */
  41        __u32 offset;   /* offset on jeb */
  42        __u32 totlen;   /* record length */
  43} __attribute__((packed));
  44
  45struct jffs2_sum_dirent_flash
  46{
  47        __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
  48        __u32 totlen;   /* record length */
  49        __u32 offset;   /* offset on jeb */
  50        __u32 pino;             /* parent inode */
  51        __u32 version;  /* dirent version */
  52        __u32 ino;              /* == zero for unlink */
  53        uint8_t nsize;          /* dirent name size */
  54        uint8_t type;           /* dirent type */
  55        uint8_t name[0];        /* dirent name */
  56} __attribute__((packed));
  57
  58struct jffs2_sum_xattr_flash
  59{
  60        __u16 nodetype; /* == JFFS2_NODETYPE_XATR */
  61        __u32 xid;              /* xattr identifier */
  62        __u32 version;  /* version number */
  63        __u32 offset;   /* offset on jeb */
  64        __u32 totlen;   /* node length */
  65} __attribute__((packed));
  66
  67struct jffs2_sum_xref_flash
  68{
  69        __u16 nodetype; /* == JFFS2_NODETYPE_XREF */
  70        __u32 offset;   /* offset on jeb */
  71} __attribute__((packed));
  72
  73union jffs2_sum_flash
  74{
  75        struct jffs2_sum_unknown_flash u;
  76        struct jffs2_sum_inode_flash i;
  77        struct jffs2_sum_dirent_flash d;
  78        struct jffs2_sum_xattr_flash x;
  79        struct jffs2_sum_xref_flash r;
  80};
  81
  82/* Summary structures used in the memory */
  83
  84struct jffs2_sum_unknown_mem
  85{
  86        union jffs2_sum_mem *next;
  87        __u16 nodetype; /* node type */
  88};
  89
  90struct jffs2_sum_inode_mem
  91{
  92        union jffs2_sum_mem *next;
  93        __u16 nodetype; /* node type */
  94        __u32 inode;            /* inode number */
  95        __u32 version;  /* inode version */
  96        __u32 offset;   /* offset on jeb */
  97        __u32 totlen;   /* record length */
  98} __attribute__((packed));
  99
 100struct jffs2_sum_dirent_mem
 101{
 102        union jffs2_sum_mem *next;
 103        __u16 nodetype; /* == JFFS_NODETYPE_DIRENT */
 104        __u32 totlen;   /* record length */
 105        __u32 offset;   /* ofset on jeb */
 106        __u32 pino;             /* parent inode */
 107        __u32 version;  /* dirent version */
 108        __u32 ino;              /* == zero for unlink */
 109        uint8_t nsize;          /* dirent name size */
 110        uint8_t type;           /* dirent type */
 111        uint8_t name[0];        /* dirent name */
 112} __attribute__((packed));
 113
 114struct jffs2_sum_xattr_mem
 115{
 116        union jffs2_sum_mem *next;
 117        __u16 nodetype;
 118        __u32 xid;
 119        __u32 version;
 120        __u32 offset;
 121        __u32 totlen;
 122} __attribute__((packed));
 123
 124struct jffs2_sum_xref_mem
 125{
 126        union jffs2_sum_mem *next;
 127        __u16 nodetype;
 128        __u32 offset;
 129} __attribute__((packed));
 130
 131union jffs2_sum_mem
 132{
 133        struct jffs2_sum_unknown_mem u;
 134        struct jffs2_sum_inode_mem i;
 135        struct jffs2_sum_dirent_mem d;
 136        struct jffs2_sum_xattr_mem x;
 137        struct jffs2_sum_xref_mem r;
 138};
 139
 140/* Summary related information stored in superblock */
 141
 142struct jffs2_summary
 143{
 144        uint32_t sum_size;      /* collected summary information for nextblock */
 145        uint32_t sum_num;
 146        uint32_t sum_padded;
 147        union jffs2_sum_mem *sum_list_head;
 148        union jffs2_sum_mem *sum_list_tail;
 149
 150        __u32 *sum_buf; /* buffer for writing out summary */
 151};
 152
 153/* Summary marker is stored at the end of every sumarized erase block */
 154
 155struct jffs2_sum_marker
 156{
 157        __u32 offset;   /* offset of the summary node in the jeb */
 158        __u32 magic;    /* == JFFS2_SUM_MAGIC */
 159};
 160
 161#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
 162
 163#endif /* JFFS2_SUMMARY_H */
 164