linux/fs/jffs2/summary.h
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   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/* Limit summary size to 64KiB so that we can kmalloc it. If the summary
  17   is larger than that, we have to just ditch it and avoid using summary
  18   for the eraseblock in question... and it probably doesn't hurt us much
  19   anyway. */
  20#define MAX_SUMMARY_SIZE 65536
  21
  22#include <linux/uio.h>
  23#include <linux/jffs2.h>
  24
  25#define BLK_STATE_ALLFF         0
  26#define BLK_STATE_CLEAN         1
  27#define BLK_STATE_PARTDIRTY     2
  28#define BLK_STATE_CLEANMARKER   3
  29#define BLK_STATE_ALLDIRTY      4
  30#define BLK_STATE_BADBLOCK      5
  31
  32#define JFFS2_SUMMARY_NOSUM_SIZE 0xffffffff
  33#define JFFS2_SUMMARY_INODE_SIZE (sizeof(struct jffs2_sum_inode_flash))
  34#define JFFS2_SUMMARY_DIRENT_SIZE(x) (sizeof(struct jffs2_sum_dirent_flash) + (x))
  35#define JFFS2_SUMMARY_XATTR_SIZE (sizeof(struct jffs2_sum_xattr_flash))
  36#define JFFS2_SUMMARY_XREF_SIZE (sizeof(struct jffs2_sum_xref_flash))
  37
  38/* Summary structures used on flash */
  39
  40struct jffs2_sum_unknown_flash
  41{
  42        jint16_t nodetype;      /* node type */
  43};
  44
  45struct jffs2_sum_inode_flash
  46{
  47        jint16_t nodetype;      /* node type */
  48        jint32_t inode;         /* inode number */
  49        jint32_t version;       /* inode version */
  50        jint32_t offset;        /* offset on jeb */
  51        jint32_t totlen;        /* record length */
  52} __attribute__((packed));
  53
  54struct jffs2_sum_dirent_flash
  55{
  56        jint16_t nodetype;      /* == JFFS_NODETYPE_DIRENT */
  57        jint32_t totlen;        /* record length */
  58        jint32_t offset;        /* offset on jeb */
  59        jint32_t pino;          /* parent inode */
  60        jint32_t version;       /* dirent version */
  61        jint32_t ino;           /* == zero for unlink */
  62        uint8_t nsize;          /* dirent name size */
  63        uint8_t type;           /* dirent type */
  64        uint8_t name[0];        /* dirent name */
  65} __attribute__((packed));
  66
  67struct jffs2_sum_xattr_flash
  68{
  69        jint16_t nodetype;      /* == JFFS2_NODETYPE_XATR */
  70        jint32_t xid;           /* xattr identifier */
  71        jint32_t version;       /* version number */
  72        jint32_t offset;        /* offset on jeb */
  73        jint32_t totlen;        /* node length */
  74} __attribute__((packed));
  75
  76struct jffs2_sum_xref_flash
  77{
  78        jint16_t nodetype;      /* == JFFS2_NODETYPE_XREF */
  79        jint32_t offset;        /* offset on jeb */
  80} __attribute__((packed));
  81
  82union jffs2_sum_flash
  83{
  84        struct jffs2_sum_unknown_flash u;
  85        struct jffs2_sum_inode_flash i;
  86        struct jffs2_sum_dirent_flash d;
  87        struct jffs2_sum_xattr_flash x;
  88        struct jffs2_sum_xref_flash r;
  89};
  90
  91/* Summary structures used in the memory */
  92
  93struct jffs2_sum_unknown_mem
  94{
  95        union jffs2_sum_mem *next;
  96        jint16_t nodetype;      /* node type */
  97};
  98
  99struct jffs2_sum_inode_mem
 100{
 101        union jffs2_sum_mem *next;
 102        jint16_t nodetype;      /* node type */
 103        jint32_t inode;         /* inode number */
 104        jint32_t version;       /* inode version */
 105        jint32_t offset;        /* offset on jeb */
 106        jint32_t totlen;        /* record length */
 107} __attribute__((packed));
 108
 109struct jffs2_sum_dirent_mem
 110{
 111        union jffs2_sum_mem *next;
 112        jint16_t nodetype;      /* == JFFS_NODETYPE_DIRENT */
 113        jint32_t totlen;        /* record length */
 114        jint32_t offset;        /* ofset on jeb */
 115        jint32_t pino;          /* parent inode */
 116        jint32_t version;       /* dirent version */
 117        jint32_t ino;           /* == zero for unlink */
 118        uint8_t nsize;          /* dirent name size */
 119        uint8_t type;           /* dirent type */
 120        uint8_t name[0];        /* dirent name */
 121} __attribute__((packed));
 122
 123struct jffs2_sum_xattr_mem
 124{
 125        union jffs2_sum_mem *next;
 126        jint16_t nodetype;
 127        jint32_t xid;
 128        jint32_t version;
 129        jint32_t offset;
 130        jint32_t totlen;
 131} __attribute__((packed));
 132
 133struct jffs2_sum_xref_mem
 134{
 135        union jffs2_sum_mem *next;
 136        jint16_t nodetype;
 137        jint32_t offset;
 138} __attribute__((packed));
 139
 140union jffs2_sum_mem
 141{
 142        struct jffs2_sum_unknown_mem u;
 143        struct jffs2_sum_inode_mem i;
 144        struct jffs2_sum_dirent_mem d;
 145        struct jffs2_sum_xattr_mem x;
 146        struct jffs2_sum_xref_mem r;
 147};
 148
 149/* Summary related information stored in superblock */
 150
 151struct jffs2_summary
 152{
 153        uint32_t sum_size;      /* collected summary information for nextblock */
 154        uint32_t sum_num;
 155        uint32_t sum_padded;
 156        union jffs2_sum_mem *sum_list_head;
 157        union jffs2_sum_mem *sum_list_tail;
 158
 159        jint32_t *sum_buf;      /* buffer for writing out summary */
 160};
 161
 162/* Summary marker is stored at the end of every sumarized erase block */
 163
 164struct jffs2_sum_marker
 165{
 166        jint32_t offset;        /* offset of the summary node in the jeb */
 167        jint32_t magic;         /* == JFFS2_SUM_MAGIC */
 168};
 169
 170#define JFFS2_SUMMARY_FRAME_SIZE (sizeof(struct jffs2_raw_summary) + sizeof(struct jffs2_sum_marker))
 171
 172#ifdef CONFIG_JFFS2_SUMMARY     /* SUMMARY SUPPORT ENABLED */
 173
 174#define jffs2_sum_active() (1)
 175int jffs2_sum_init(struct jffs2_sb_info *c);
 176void jffs2_sum_exit(struct jffs2_sb_info *c);
 177void jffs2_sum_disable_collecting(struct jffs2_summary *s);
 178int jffs2_sum_is_disabled(struct jffs2_summary *s);
 179void jffs2_sum_reset_collected(struct jffs2_summary *s);
 180void jffs2_sum_move_collected(struct jffs2_sb_info *c, struct jffs2_summary *s);
 181int jffs2_sum_add_kvec(struct jffs2_sb_info *c, const struct kvec *invecs,
 182                        unsigned long count,  uint32_t to);
 183int jffs2_sum_write_sumnode(struct jffs2_sb_info *c);
 184int jffs2_sum_add_padding_mem(struct jffs2_summary *s, uint32_t size);
 185int jffs2_sum_add_inode_mem(struct jffs2_summary *s, struct jffs2_raw_inode *ri, uint32_t ofs);
 186int jffs2_sum_add_dirent_mem(struct jffs2_summary *s, struct jffs2_raw_dirent *rd, uint32_t ofs);
 187int jffs2_sum_add_xattr_mem(struct jffs2_summary *s, struct jffs2_raw_xattr *rx, uint32_t ofs);
 188int jffs2_sum_add_xref_mem(struct jffs2_summary *s, struct jffs2_raw_xref *rr, uint32_t ofs);
 189int jffs2_sum_scan_sumnode(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb,
 190                           struct jffs2_raw_summary *summary, uint32_t sumlen,
 191                           uint32_t *pseudo_random);
 192
 193#else                           /* SUMMARY DISABLED */
 194
 195#define jffs2_sum_active() (0)
 196#define jffs2_sum_init(a) (0)
 197#define jffs2_sum_exit(a)
 198#define jffs2_sum_disable_collecting(a)
 199#define jffs2_sum_is_disabled(a) (0)
 200#define jffs2_sum_reset_collected(a)
 201#define jffs2_sum_add_kvec(a,b,c,d) (0)
 202#define jffs2_sum_move_collected(a,b)
 203#define jffs2_sum_write_sumnode(a) (0)
 204#define jffs2_sum_add_padding_mem(a,b)
 205#define jffs2_sum_add_inode_mem(a,b,c)
 206#define jffs2_sum_add_dirent_mem(a,b,c)
 207#define jffs2_sum_add_xattr_mem(a,b,c)
 208#define jffs2_sum_add_xref_mem(a,b,c)
 209#define jffs2_sum_scan_sumnode(a,b,c,d,e) (0)
 210
 211#endif /* CONFIG_JFFS2_SUMMARY */
 212
 213#endif /* JFFS2_SUMMARY_H */
 214
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