fs/squashfs/squashfs_fs.h

   1 #ifndef SQUASHFS_FS
   2 #define SQUASHFS_FS
   3 /*
   4  * Squashfs
   5  *
   6  * Copyright (c) 2002, 2003, 2004, 2005, 2006, 2007, 2008
   7  * Phillip Lougher <phillip@squashfs.org.uk>
   8  *
   9  * This program is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU General Public License
  11  * as published by the Free Software Foundation; either version 2,
  12  * or (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
  22  *
  23  * squashfs_fs.h
  24  */
  25
  26 #define SQUASHFS_CACHED_FRAGMENTS       CONFIG_SQUASHFS_FRAGMENT_CACHE_SIZE
  27 #define SQUASHFS_MAJOR                  4
  28 #define SQUASHFS_MINOR                  0
  29 #define SQUASHFS_START                  0
  30
  31 /* size of metadata (inode and directory) blocks */
  32 #define SQUASHFS_METADATA_SIZE          8192
  33
  34 /* default size of block device I/O */
  35 #ifdef CONFIG_SQUASHFS_4K_DEVBLK_SIZE
  36 #define SQUASHFS_DEVBLK_SIZE 4096
  37 #else
  38 #define SQUASHFS_DEVBLK_SIZE 1024
  39 #endif
  40
  41 #define SQUASHFS_FILE_MAX_SIZE          1048576
  42 #define SQUASHFS_FILE_MAX_LOG           20
  43
  44 /* Max length of filename (not 255) */
  45 #define SQUASHFS_NAME_LEN               256
  46
  47 /* Max value for directory header count*/
  48 #define SQUASHFS_DIR_COUNT              256
  49
  50 #define SQUASHFS_INVALID_FRAG           (0xffffffffU)
  51 #define SQUASHFS_INVALID_XATTR          (0xffffffffU)
  52 #define SQUASHFS_INVALID_BLK            (-1LL)
  53
  54 /* Filesystem flags */
  55 #define SQUASHFS_NOI                    0
  56 #define SQUASHFS_NOD                    1
  57 #define SQUASHFS_NOF                    3
  58 #define SQUASHFS_NO_FRAG                4
  59 #define SQUASHFS_ALWAYS_FRAG            5
  60 #define SQUASHFS_DUPLICATE              6
  61 #define SQUASHFS_EXPORT                 7
  62 #define SQUASHFS_COMP_OPT               10
  63
  64 #define SQUASHFS_BIT(flag, bit)         ((flag >> bit) & 1)
  65
  66 #define SQUASHFS_UNCOMPRESSED_INODES(flags)     SQUASHFS_BIT(flags, \
  67                                                 SQUASHFS_NOI)
  68
  69 #define SQUASHFS_UNCOMPRESSED_DATA(flags)       SQUASHFS_BIT(flags, \
  70                                                 SQUASHFS_NOD)
  71
  72 #define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags)  SQUASHFS_BIT(flags, \
  73                                                 SQUASHFS_NOF)
  74
  75 #define SQUASHFS_NO_FRAGMENTS(flags)            SQUASHFS_BIT(flags, \
  76                                                 SQUASHFS_NO_FRAG)
  77
  78 #define SQUASHFS_ALWAYS_FRAGMENTS(flags)        SQUASHFS_BIT(flags, \
  79                                                 SQUASHFS_ALWAYS_FRAG)
  80
  81 #define SQUASHFS_DUPLICATES(flags)              SQUASHFS_BIT(flags, \
  82                                                 SQUASHFS_DUPLICATE)
  83
  84 #define SQUASHFS_EXPORTABLE(flags)              SQUASHFS_BIT(flags, \
  85                                                 SQUASHFS_EXPORT)
  86
  87 #define SQUASHFS_COMP_OPTS(flags)               SQUASHFS_BIT(flags, \
  88                                                 SQUASHFS_COMP_OPT)
  89
  90 /* Inode types including extended types */
  91 #define SQUASHFS_DIR_TYPE               1
  92 #define SQUASHFS_REG_TYPE               2
  93 #define SQUASHFS_SYMLINK_TYPE           3
  94 #define SQUASHFS_BLKDEV_TYPE            4
  95 #define SQUASHFS_CHRDEV_TYPE            5
  96 #define SQUASHFS_FIFO_TYPE              6
  97 #define SQUASHFS_SOCKET_TYPE            7
  98 #define SQUASHFS_LDIR_TYPE              8
  99 #define SQUASHFS_LREG_TYPE              9
 100 #define SQUASHFS_LSYMLINK_TYPE          10
 101 #define SQUASHFS_LBLKDEV_TYPE           11
 102 #define SQUASHFS_LCHRDEV_TYPE           12
 103 #define SQUASHFS_LFIFO_TYPE             13
 104 #define SQUASHFS_LSOCKET_TYPE           14
 105
 106 /* Max type value stored in directory entry */
 107 #define SQUASHFS_MAX_DIR_TYPE           7
 108
 109 /* Xattr types */
 110 #define SQUASHFS_XATTR_USER             0
 111 #define SQUASHFS_XATTR_TRUSTED          1
 112 #define SQUASHFS_XATTR_SECURITY         2
 113 #define SQUASHFS_XATTR_VALUE_OOL        256
 114 #define SQUASHFS_XATTR_PREFIX_MASK      0xff
 115
 116 /* Flag whether block is compressed or uncompressed, bit is set if block is
 117  * uncompressed */
 118 #define SQUASHFS_COMPRESSED_BIT         (1 << 15)
 119
 120 #define SQUASHFS_COMPRESSED_SIZE(B)     (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \
 121                 (B) & ~SQUASHFS_COMPRESSED_BIT :  SQUASHFS_COMPRESSED_BIT)
 122
 123 #define SQUASHFS_COMPRESSED(B)          (!((B) & SQUASHFS_COMPRESSED_BIT))
 124
 125 #define SQUASHFS_COMPRESSED_BIT_BLOCK   (1 << 24)
 126
 127 #define SQUASHFS_COMPRESSED_SIZE_BLOCK(B)       ((B) & \
 128                                                 ~SQUASHFS_COMPRESSED_BIT_BLOCK)
 129
 130 #define SQUASHFS_COMPRESSED_BLOCK(B)    (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK))
 131
 132 /*
 133  * Inode number ops.  Inodes consist of a compressed block number, and an
 134  * uncompressed offset within that block
 135  */
 136 #define SQUASHFS_INODE_BLK(A)           ((unsigned int) ((A) >> 16))
 137
 138 #define SQUASHFS_INODE_OFFSET(A)        ((unsigned int) ((A) & 0xffff))
 139
 140 #define SQUASHFS_MKINODE(A, B)          ((long long)(((long long) (A)\
 141                                         << 16) + (B)))
 142
 143 /* fragment and fragment table defines */
 144 #define SQUASHFS_FRAGMENT_BYTES(A)      \
 145                                 ((A) * sizeof(struct squashfs_fragment_entry))
 146
 147 #define SQUASHFS_FRAGMENT_INDEX(A)      (SQUASHFS_FRAGMENT_BYTES(A) / \
 148                                         SQUASHFS_METADATA_SIZE)
 149
 150 #define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)       (SQUASHFS_FRAGMENT_BYTES(A) % \
 151                                                 SQUASHFS_METADATA_SIZE)
 152
 153 #define SQUASHFS_FRAGMENT_INDEXES(A)    ((SQUASHFS_FRAGMENT_BYTES(A) + \
 154                                         SQUASHFS_METADATA_SIZE - 1) / \
 155                                         SQUASHFS_METADATA_SIZE)
 156
 157 #define SQUASHFS_FRAGMENT_INDEX_BYTES(A)        (SQUASHFS_FRAGMENT_INDEXES(A) *\
 158                                                 sizeof(u64))
 159
 160 /* inode lookup table defines */
 161 #define SQUASHFS_LOOKUP_BYTES(A)        ((A) * sizeof(u64))
 162
 163 #define SQUASHFS_LOOKUP_BLOCK(A)        (SQUASHFS_LOOKUP_BYTES(A) / \
 164                                         SQUASHFS_METADATA_SIZE)
 165
 166 #define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
 167                                         SQUASHFS_METADATA_SIZE)
 168
 169 #define SQUASHFS_LOOKUP_BLOCKS(A)       ((SQUASHFS_LOOKUP_BYTES(A) + \
 170                                         SQUASHFS_METADATA_SIZE - 1) / \
 171                                         SQUASHFS_METADATA_SIZE)
 172
 173 #define SQUASHFS_LOOKUP_BLOCK_BYTES(A)  (SQUASHFS_LOOKUP_BLOCKS(A) *\
 174                                         sizeof(u64))
 175
 176 /* uid/gid lookup table defines */
 177 #define SQUASHFS_ID_BYTES(A)            ((A) * sizeof(unsigned int))
 178
 179 #define SQUASHFS_ID_BLOCK(A)            (SQUASHFS_ID_BYTES(A) / \
 180                                         SQUASHFS_METADATA_SIZE)
 181
 182 #define SQUASHFS_ID_BLOCK_OFFSET(A)     (SQUASHFS_ID_BYTES(A) % \
 183                                         SQUASHFS_METADATA_SIZE)
 184
 185 #define SQUASHFS_ID_BLOCKS(A)           ((SQUASHFS_ID_BYTES(A) + \
 186                                         SQUASHFS_METADATA_SIZE - 1) / \
 187                                         SQUASHFS_METADATA_SIZE)
 188
 189 #define SQUASHFS_ID_BLOCK_BYTES(A)      (SQUASHFS_ID_BLOCKS(A) *\
 190                                         sizeof(u64))
 191 /* xattr id lookup table defines */
 192 #define SQUASHFS_XATTR_BYTES(A)         ((A) * sizeof(struct squashfs_xattr_id))
 193
 194 #define SQUASHFS_XATTR_BLOCK(A)         (SQUASHFS_XATTR_BYTES(A) / \
 195                                         SQUASHFS_METADATA_SIZE)
 196
 197 #define SQUASHFS_XATTR_BLOCK_OFFSET(A)  (SQUASHFS_XATTR_BYTES(A) % \
 198                                         SQUASHFS_METADATA_SIZE)
 199
 200 #define SQUASHFS_XATTR_BLOCKS(A)        ((SQUASHFS_XATTR_BYTES(A) + \
 201                                         SQUASHFS_METADATA_SIZE - 1) / \
 202                                         SQUASHFS_METADATA_SIZE)
 203
 204 #define SQUASHFS_XATTR_BLOCK_BYTES(A)   (SQUASHFS_XATTR_BLOCKS(A) *\
 205                                         sizeof(u64))
 206 #define SQUASHFS_XATTR_BLK(A)           ((unsigned int) ((A) >> 16))
 207
 208 #define SQUASHFS_XATTR_OFFSET(A)        ((unsigned int) ((A) & 0xffff))
 209
 210 /* cached data constants for filesystem */
 211 #define SQUASHFS_CACHED_BLKS            8
 212
 213 /* meta index cache */
 214 #define SQUASHFS_META_INDEXES   (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
 215 #define SQUASHFS_META_ENTRIES   127
 216 #define SQUASHFS_META_SLOTS     8
 217
 218 struct meta_entry {
 219         u64                     data_block;
 220         unsigned int            index_block;
 221         unsigned short          offset;
 222         unsigned short          pad;
 223 };
 224
 225 struct meta_index {
 226         unsigned int            inode_number;
 227         unsigned int            offset;
 228         unsigned short          entries;
 229         unsigned short          skip;
 230         unsigned short          locked;
 231         unsigned short          pad;
 232         struct meta_entry       meta_entry[SQUASHFS_META_ENTRIES];
 233 };
 234
 235
 236 /*
 237  * definitions for structures on disk
 238  */
 239 #define ZLIB_COMPRESSION        1
 240 #define LZMA_COMPRESSION        2
 241 #define LZO_COMPRESSION         3
 242 #define XZ_COMPRESSION          4
 243
 244 struct squashfs_super_block {
 245         __le32                  s_magic;
 246         __le32                  inodes;
 247         __le32                  mkfs_time;
 248         __le32                  block_size;
 249         __le32                  fragments;
 250         __le16                  compression;
 251         __le16                  block_log;
 252         __le16                  flags;
 253         __le16                  no_ids;
 254         __le16                  s_major;
 255         __le16                  s_minor;
 256         __le64                  root_inode;
 257         __le64                  bytes_used;
 258         __le64                  id_table_start;
 259         __le64                  xattr_id_table_start;
 260         __le64                  inode_table_start;
 261         __le64                  directory_table_start;
 262         __le64                  fragment_table_start;
 263         __le64                  lookup_table_start;
 264 };
 265
 266 struct squashfs_dir_index {
 267         __le32                  index;
 268         __le32                  start_block;
 269         __le32                  size;
 270         unsigned char           name[0];
 271 };
 272
 273 struct squashfs_base_inode {
 274         __le16                  inode_type;
 275         __le16                  mode;
 276         __le16                  uid;
 277         __le16                  guid;
 278         __le32                  mtime;
 279         __le32                  inode_number;
 280 };
 281
 282 struct squashfs_ipc_inode {
 283         __le16                  inode_type;
 284         __le16                  mode;
 285         __le16                  uid;
 286         __le16                  guid;
 287         __le32                  mtime;
 288         __le32                  inode_number;
 289         __le32                  nlink;
 290 };
 291
 292 struct squashfs_lipc_inode {
 293         __le16                  inode_type;
 294         __le16                  mode;
 295         __le16                  uid;
 296         __le16                  guid;
 297         __le32                  mtime;
 298         __le32                  inode_number;
 299         __le32                  nlink;
 300         __le32                  xattr;
 301 };
 302
 303 struct squashfs_dev_inode {
 304         __le16                  inode_type;
 305         __le16                  mode;
 306         __le16                  uid;
 307         __le16                  guid;
 308         __le32                  mtime;
 309         __le32                  inode_number;
 310         __le32                  nlink;
 311         __le32                  rdev;
 312 };
 313
 314 struct squashfs_ldev_inode {
 315         __le16                  inode_type;
 316         __le16                  mode;
 317         __le16                  uid;
 318         __le16                  guid;
 319         __le32                  mtime;
 320         __le32                  inode_number;
 321         __le32                  nlink;
 322         __le32                  rdev;
 323         __le32                  xattr;
 324 };
 325
 326 struct squashfs_symlink_inode {
 327         __le16                  inode_type;
 328         __le16                  mode;
 329         __le16                  uid;
 330         __le16                  guid;
 331         __le32                  mtime;
 332         __le32                  inode_number;
 333         __le32                  nlink;
 334         __le32                  symlink_size;
 335         char                    symlink[0];
 336 };
 337
 338 struct squashfs_reg_inode {
 339         __le16                  inode_type;
 340         __le16                  mode;
 341         __le16                  uid;
 342         __le16                  guid;
 343         __le32                  mtime;
 344         __le32                  inode_number;
 345         __le32                  start_block;
 346         __le32                  fragment;
 347         __le32                  offset;
 348         __le32                  file_size;
 349         __le16                  block_list[0];
 350 };
 351
 352 struct squashfs_lreg_inode {
 353         __le16                  inode_type;
 354         __le16                  mode;
 355         __le16                  uid;
 356         __le16                  guid;
 357         __le32                  mtime;
 358         __le32                  inode_number;
 359         __le64                  start_block;
 360         __le64                  file_size;
 361         __le64                  sparse;
 362         __le32                  nlink;
 363         __le32                  fragment;
 364         __le32                  offset;
 365         __le32                  xattr;
 366         __le16                  block_list[0];
 367 };
 368
 369 struct squashfs_dir_inode {
 370         __le16                  inode_type;
 371         __le16                  mode;
 372         __le16                  uid;
 373         __le16                  guid;
 374         __le32                  mtime;
 375         __le32                  inode_number;
 376         __le32                  start_block;
 377         __le32                  nlink;
 378         __le16                  file_size;
 379         __le16                  offset;
 380         __le32                  parent_inode;
 381 };
 382
 383 struct squashfs_ldir_inode {
 384         __le16                  inode_type;
 385         __le16                  mode;
 386         __le16                  uid;
 387         __le16                  guid;
 388         __le32                  mtime;
 389         __le32                  inode_number;
 390         __le32                  nlink;
 391         __le32                  file_size;
 392         __le32                  start_block;
 393         __le32                  parent_inode;
 394         __le16                  i_count;
 395         __le16                  offset;
 396         __le32                  xattr;
 397         struct squashfs_dir_index       index[0];
 398 };
 399
 400 union squashfs_inode {
 401         struct squashfs_base_inode              base;
 402         struct squashfs_dev_inode               dev;
 403         struct squashfs_ldev_inode              ldev;
 404         struct squashfs_symlink_inode           symlink;
 405         struct squashfs_reg_inode               reg;
 406         struct squashfs_lreg_inode              lreg;
 407         struct squashfs_dir_inode               dir;
 408         struct squashfs_ldir_inode              ldir;
 409         struct squashfs_ipc_inode               ipc;
 410         struct squashfs_lipc_inode              lipc;
 411 };
 412
 413 struct squashfs_dir_entry {
 414         __le16                  offset;
 415         __le16                  inode_number;
 416         __le16                  type;
 417         __le16                  size;
 418         char                    name[0];
 419 };
 420
 421 struct squashfs_dir_header {
 422         __le32                  count;
 423         __le32                  start_block;
 424         __le32                  inode_number;
 425 };
 426
 427 struct squashfs_fragment_entry {
 428         __le64                  start_block;
 429         __le32                  size;
 430         unsigned int            unused;
 431 };
 432
 433 struct squashfs_xattr_entry {
 434         __le16                  type;
 435         __le16                  size;
 436         char                    data[0];
 437 };
 438
 439 struct squashfs_xattr_val {
 440         __le32                  vsize;
 441         char                    value[0];
 442 };
 443
 444 struct squashfs_xattr_id {
 445         __le64                  xattr;
 446         __le32                  count;
 447         __le32                  size;
 448 };
 449
 450 struct squashfs_xattr_id_table {
 451         __le64                  xattr_table_start;
 452         __le32                  xattr_ids;
 453         __le32                  unused;
 454 };
 455
 456 #endif