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 #include <linux/uio.h>
  17 #include <linux/jffs2.h>
  18
  19 #define BLK_STATE_ALLFF         0
  20 #define BLK_STATE_CLEAN         1
  21 #define BLK_STATE_PARTDIRTY     2
  22 #define BLK_STATE_CLEANMARKER   3
  23 #define BLK_STATE_ALLDIRTY      4
  24 #define BLK_STATE_BADBLOCK      5
  25
  26 #define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
  27 #define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
  28 #define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
  29 #define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
  30 #define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
  31
  32 /* Summary structures used on flash */
  33
  34 struct jffs2_sum_unknown_flash
  35 {
  36         jint16_t nodetype;      /* node type */
  37 };
  38
  39 struct jffs2_sum_inode_flash
  40 {
  41         jint16_t nodetype;      /* node type */
  42         jint32_t inode;         /* inode number */
  43         jint32_t version;       /* inode version */
  44         jint32_t offset;        /* offset on jeb */
  45         jint32_t totlen;        /* record length */
  46 } __attribute__((packed));
  47
  48 struct jffs2_sum_dirent_flash
  49 {
  50         jint16_t nodetype;      /* == JFFS_NODETYPE_DIRENT */
  51         jint32_t totlen;        /* record length */
  52         jint32_t offset;        /* offset on jeb */
  53         jint32_t pino;          /* parent inode */
  54         jint32_t version;       /* dirent version */
  55         jint32_t ino;           /* == zero for unlink */
  56         uint8_t nsize;          /* dirent name size */
  57         uint8_t type;           /* dirent type */
  58         uint8_t name[0];        /* dirent name */
  59 } __attribute__((packed));
  60
  61 struct jffs2_sum_xattr_flash
  62 {
  63         jint16_t nodetype;      /* == JFFS2_NODETYPE_XATR */
  64         jint32_t xid;           /* xattr identifier */
  65         jint32_t version;       /* version number */
  66         jint32_t offset;        /* offset on jeb */
  67         jint32_t totlen;        /* node length */
  68 } __attribute__((packed));
  69
  70 struct jffs2_sum_xref_flash
  71 {
  72         jint16_t nodetype;      /* == JFFS2_NODETYPE_XREF */
  73         jint32_t offset;        /* offset on jeb */
  74 } __attribute__((packed));
  75
  76 union jffs2_sum_flash
  77 {
  78         struct jffs2_sum_unknown_flash u;
  79         struct jffs2_sum_inode_flash i;
  80         struct jffs2_sum_dirent_flash d;
  81         struct jffs2_sum_xattr_flash x;
  82         struct jffs2_sum_xref_flash r;
  83 };
  84
  85 /* Summary structures used in the memory */
  86
  87 struct jffs2_sum_unknown_mem
  88 {
  89         union jffs2_sum_mem *next;
  90         jint16_t nodetype;      /* node type */
  91 };
  92
  93 struct jffs2_sum_inode_mem
  94 {
  95         union jffs2_sum_mem *next;
  96         jint16_t nodetype;      /* node type */
  97         jint32_t inode;         /* inode number */
  98         jint32_t version;       /* inode version */
  99         jint32_t offset;        /* offset on jeb */
 100         jint32_t totlen;        /* record length */
 101 } __attribute__((packed));
 102
 103 struct jffs2_sum_dirent_mem
 104 {
 105         union jffs2_sum_mem *next;
 106         jint16_t nodetype;      /* == JFFS_NODETYPE_DIRENT */
 107         jint32_t totlen;        /* record length */
 108         jint32_t offset;        /* ofset on jeb */
 109         jint32_t pino;          /* parent inode */
 110         jint32_t version;       /* dirent version */
 111         jint32_t ino;           /* == zero for unlink */
 112         uint8_t nsize;          /* dirent name size */
 113         uint8_t type;           /* dirent type */
 114         uint8_t name[0];        /* dirent name */
 115 } __attribute__((packed));
 116
 117 struct jffs2_sum_xattr_mem
 118 {
 119         union jffs2_sum_mem *next;
 120         jint16_t nodetype;
 121         jint32_t xid;
 122         jint32_t version;
 123         jint32_t offset;
 124         jint32_t totlen;
 125 } __attribute__((packed));
 126
 127 struct jffs2_sum_xref_mem
 128 {
 129         union jffs2_sum_mem *next;
 130         jint16_t nodetype;
 131         jint32_t offset;
 132 } __attribute__((packed));
 133
 134 union jffs2_sum_mem
 135 {
 136         struct jffs2_sum_unknown_mem u;
 137         struct jffs2_sum_inode_mem i;
 138         struct jffs2_sum_dirent_mem d;
 139         struct jffs2_sum_xattr_mem x;
 140         struct jffs2_sum_xref_mem r;
 141 };
 142
 143 /* Summary related information stored in superblock */
 144
 145 struct jffs2_summary
 146 {
 147         uint32_t sum_size;      /* collected summary information for nextblock */
 148         uint32_t sum_num;
 149         uint32_t sum_padded;
 150         union jffs2_sum_mem *sum_list_head;
 151         union jffs2_sum_mem *sum_list_tail;
 152
 153         jint32_t *sum_buf;      /* buffer for writing out summary */
 154 };
 155
 156 /* Summary marker is stored at the end of every sumarized erase block */
 157
 158 struct jffs2_sum_marker
 159 {
 160         jint32_t offset;        /* offset of the summary node in the jeb */
 161         jint32_t magic;         /* == JFFS2_SUM_MAGIC */
 162 };
 163
 164 #define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
 165
 166 #ifdef CONFIG_JFFS2_SUMMARY     /* SUMMARY SUPPORT ENABLED */
 167
 168 #define jffs2_sum_active() (1)
 169 int jffs2_sum_init(struct jffs2_sb_info *c);
 170 void jffs2_sum_exit(struct jffs2_sb_info *c);
 171 void jffs2_sum_disable_collecting(struct jffs2_summary *s);
 172 int jffs2_sum_is_disabled(struct jffs2_summary *s);
 173 void jffs2_sum_reset_collected(struct jffs2_summary *s);
 174 void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s);
 175 int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 176                         unsigned long count,  uint32_t to);
 177 int jffs2_sum_write_sumnode(struct jffs2_sb_info *c);
 178 int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size);
 179 int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs);
 180 int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs);
 181 int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs);
 182 int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs);
 183 int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 184                            struct jffs2_raw_summary *summary, uint32_t sumlen,
 185                            uint32_t *pseudo_random);
 186
 187 #else                           /* SUMMARY DISABLED */
 188
 189 #define jffs2_sum_active() (0)
 190 #define jffs2_sum_init(a) (0)
 191 #define jffs2_sum_exit(a)
 192 #define jffs2_sum_disable_collecting(a)
 193 #define jffs2_sum_is_disabled(a) (0)
 194 #define jffs2_sum_reset_collected(a)
 195 #define jffs2_sum_add_kvec(a,b,c,d) (0)
 196 #define jffs2_sum_move_collected(a,b)
 197 #define jffs2_sum_write_sumnode(a) (0)
 198 #define jffs2_sum_add_padding_mem(a,b)
 199 #define jffs2_sum_add_inode_mem(a,b,c)
 200 #define jffs2_sum_add_dirent_mem(a,b,c)
 201 #define jffs2_sum_add_xattr_mem(a,b,c)
 202 #define jffs2_sum_add_xref_mem(a,b,c)
 203 #define jffs2_sum_scan_sumnode(a,b,c,d,e) (0)
 204
 205 #endif /* CONFIG_JFFS2_SUMMARY */
 206
 207 #endif /* JFFS2_SUMMARY_H */