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
  31 struct jffs2_sum_unknown_flash
  32 {
  33         __u16 nodetype; /* node type */
  34 };
  35
  36 struct 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
  45 struct 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
  58 struct 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
  67 struct jffs2_sum_xref_flash
  68 {
  69         __u16 nodetype; /* == JFFS2_NODETYPE_XREF */
  70         __u32 offset;   /* offset on jeb */
  71 } __attribute__((packed));
  72
  73 union 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
  84 struct jffs2_sum_unknown_mem
  85 {
  86         union jffs2_sum_mem *next;
  87         __u16 nodetype; /* node type */
  88 };
  89
  90 struct 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
 100 struct 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
 114 struct 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
 124 struct jffs2_sum_xref_mem
 125 {
 126         union jffs2_sum_mem *next;
 127         __u16 nodetype;
 128         __u32 offset;
 129 } __attribute__((packed));
 130
 131 union 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
 142 struct 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
 155 struct 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 */