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 static inline int squashfs_block_size(__le32 raw)
 133 {
 134         u32 size = le32_to_cpu(raw);
 135         return (size >> 25) ? -EIO : size;
 136 }
 137
 138 /*
 139  * Inode number ops.  Inodes consist of a compressed block number, and an
 140  * uncompressed offset within that block
 141  */
 142 #define SQUASHFS_INODE_BLK(A)           ((unsigned int) ((A) >> 16))
 143
 144 #define SQUASHFS_INODE_OFFSET(A)        ((unsigned int) ((A) & 0xffff))
 145
 146 #define SQUASHFS_MKINODE(A, B)          ((long long)(((long long) (A)\
 147                                         << 16) + (B)))
 148
 149 /* fragment and fragment table defines */
 150 #define SQUASHFS_FRAGMENT_BYTES(A)      \
 151                                 ((A) * sizeof(struct squashfs_fragment_entry))
 152
 153 #define SQUASHFS_FRAGMENT_INDEX(A)      (SQUASHFS_FRAGMENT_BYTES(A) / \
 154                                         SQUASHFS_METADATA_SIZE)
 155
 156 #define SQUASHFS_FRAGMENT_INDEX_OFFSET(A)       (SQUASHFS_FRAGMENT_BYTES(A) % \
 157                                                 SQUASHFS_METADATA_SIZE)
 158
 159 #define SQUASHFS_FRAGMENT_INDEXES(A)    ((SQUASHFS_FRAGMENT_BYTES(A) + \
 160                                         SQUASHFS_METADATA_SIZE - 1) / \
 161                                         SQUASHFS_METADATA_SIZE)
 162
 163 #define SQUASHFS_FRAGMENT_INDEX_BYTES(A)        (SQUASHFS_FRAGMENT_INDEXES(A) *\
 164                                                 sizeof(u64))
 165
 166 /* inode lookup table defines */
 167 #define SQUASHFS_LOOKUP_BYTES(A)        ((A) * sizeof(u64))
 168
 169 #define SQUASHFS_LOOKUP_BLOCK(A)        (SQUASHFS_LOOKUP_BYTES(A) / \
 170                                         SQUASHFS_METADATA_SIZE)
 171
 172 #define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \
 173                                         SQUASHFS_METADATA_SIZE)
 174
 175 #define SQUASHFS_LOOKUP_BLOCKS(A)       ((SQUASHFS_LOOKUP_BYTES(A) + \
 176                                         SQUASHFS_METADATA_SIZE - 1) / \
 177                                         SQUASHFS_METADATA_SIZE)
 178
 179 #define SQUASHFS_LOOKUP_BLOCK_BYTES(A)  (SQUASHFS_LOOKUP_BLOCKS(A) *\
 180                                         sizeof(u64))
 181
 182 /* uid/gid lookup table defines */
 183 #define SQUASHFS_ID_BYTES(A)            ((A) * sizeof(unsigned int))
 184
 185 #define SQUASHFS_ID_BLOCK(A)            (SQUASHFS_ID_BYTES(A) / \
 186                                         SQUASHFS_METADATA_SIZE)
 187
 188 #define SQUASHFS_ID_BLOCK_OFFSET(A)     (SQUASHFS_ID_BYTES(A) % \
 189                                         SQUASHFS_METADATA_SIZE)
 190
 191 #define SQUASHFS_ID_BLOCKS(A)           ((SQUASHFS_ID_BYTES(A) + \
 192                                         SQUASHFS_METADATA_SIZE - 1) / \
 193                                         SQUASHFS_METADATA_SIZE)
 194
 195 #define SQUASHFS_ID_BLOCK_BYTES(A)      (SQUASHFS_ID_BLOCKS(A) *\
 196                                         sizeof(u64))
 197 /* xattr id lookup table defines */
 198 #define SQUASHFS_XATTR_BYTES(A)         ((A) * sizeof(struct squashfs_xattr_id))
 199
 200 #define SQUASHFS_XATTR_BLOCK(A)         (SQUASHFS_XATTR_BYTES(A) / \
 201                                         SQUASHFS_METADATA_SIZE)
 202
 203 #define SQUASHFS_XATTR_BLOCK_OFFSET(A)  (SQUASHFS_XATTR_BYTES(A) % \
 204                                         SQUASHFS_METADATA_SIZE)
 205
 206 #define SQUASHFS_XATTR_BLOCKS(A)        ((SQUASHFS_XATTR_BYTES(A) + \
 207                                         SQUASHFS_METADATA_SIZE - 1) / \
 208                                         SQUASHFS_METADATA_SIZE)
 209
 210 #define SQUASHFS_XATTR_BLOCK_BYTES(A)   (SQUASHFS_XATTR_BLOCKS(A) *\
 211                                         sizeof(u64))
 212 #define SQUASHFS_XATTR_BLK(A)           ((unsigned int) ((A) >> 16))
 213
 214 #define SQUASHFS_XATTR_OFFSET(A)        ((unsigned int) ((A) & 0xffff))
 215
 216 /* cached data constants for filesystem */
 217 #define SQUASHFS_CACHED_BLKS            8
 218
 219 /* meta index cache */
 220 #define SQUASHFS_META_INDEXES   (SQUASHFS_METADATA_SIZE / sizeof(unsigned int))
 221 #define SQUASHFS_META_ENTRIES   127
 222 #define SQUASHFS_META_SLOTS     8
 223
 224 struct meta_entry {
 225         u64                     data_block;
 226         unsigned int            index_block;
 227         unsigned short          offset;
 228         unsigned short          pad;
 229 };
 230
 231 struct meta_index {
 232         unsigned int            inode_number;
 233         unsigned int            offset;
 234         unsigned short          entries;
 235         unsigned short          skip;
 236         unsigned short          locked;
 237         unsigned short          pad;
 238         struct meta_entry       meta_entry[SQUASHFS_META_ENTRIES];
 239 };
 240
 241
 242 /*
 243  * definitions for structures on disk
 244  */
 245 #define ZLIB_COMPRESSION        1
 246 #define LZMA_COMPRESSION        2
 247 #define LZO_COMPRESSION         3
 248 #define XZ_COMPRESSION          4
 249 #define LZ4_COMPRESSION         5
 250
 251 struct squashfs_super_block {
 252         __le32                  s_magic;
 253         __le32                  inodes;
 254         __le32                  mkfs_time;
 255         __le32                  block_size;
 256         __le32                  fragments;
 257         __le16                  compression;
 258         __le16                  block_log;
 259         __le16                  flags;
 260         __le16                  no_ids;
 261         __le16                  s_major;
 262         __le16                  s_minor;
 263         __le64                  root_inode;
 264         __le64                  bytes_used;
 265         __le64                  id_table_start;
 266         __le64                  xattr_id_table_start;
 267         __le64                  inode_table_start;
 268         __le64                  directory_table_start;
 269         __le64                  fragment_table_start;
 270         __le64                  lookup_table_start;
 271 };
 272
 273 struct squashfs_dir_index {
 274         __le32                  index;
 275         __le32                  start_block;
 276         __le32                  size;
 277         unsigned char           name[0];
 278 };
 279
 280 struct squashfs_base_inode {
 281         __le16                  inode_type;
 282         __le16                  mode;
 283         __le16                  uid;
 284         __le16                  guid;
 285         __le32                  mtime;
 286         __le32                  inode_number;
 287 };
 288
 289 struct squashfs_ipc_inode {
 290         __le16                  inode_type;
 291         __le16                  mode;
 292         __le16                  uid;
 293         __le16                  guid;
 294         __le32                  mtime;
 295         __le32                  inode_number;
 296         __le32                  nlink;
 297 };
 298
 299 struct squashfs_lipc_inode {
 300         __le16                  inode_type;
 301         __le16                  mode;
 302         __le16                  uid;
 303         __le16                  guid;
 304         __le32                  mtime;
 305         __le32                  inode_number;
 306         __le32                  nlink;
 307         __le32                  xattr;
 308 };
 309
 310 struct squashfs_dev_inode {
 311         __le16                  inode_type;
 312         __le16                  mode;
 313         __le16                  uid;
 314         __le16                  guid;
 315         __le32                  mtime;
 316         __le32                  inode_number;
 317         __le32                  nlink;
 318         __le32                  rdev;
 319 };
 320
 321 struct squashfs_ldev_inode {
 322         __le16                  inode_type;
 323         __le16                  mode;
 324         __le16                  uid;
 325         __le16                  guid;
 326         __le32                  mtime;
 327         __le32                  inode_number;
 328         __le32                  nlink;
 329         __le32                  rdev;
 330         __le32                  xattr;
 331 };
 332
 333 struct squashfs_symlink_inode {
 334         __le16                  inode_type;
 335         __le16                  mode;
 336         __le16                  uid;
 337         __le16                  guid;
 338         __le32                  mtime;
 339         __le32                  inode_number;
 340         __le32                  nlink;
 341         __le32                  symlink_size;
 342         char                    symlink[0];
 343 };
 344
 345 struct squashfs_reg_inode {
 346         __le16                  inode_type;
 347         __le16                  mode;
 348         __le16                  uid;
 349         __le16                  guid;
 350         __le32                  mtime;
 351         __le32                  inode_number;
 352         __le32                  start_block;
 353         __le32                  fragment;
 354         __le32                  offset;
 355         __le32                  file_size;
 356         __le16                  block_list[0];
 357 };
 358
 359 struct squashfs_lreg_inode {
 360         __le16                  inode_type;
 361         __le16                  mode;
 362         __le16                  uid;
 363         __le16                  guid;
 364         __le32                  mtime;
 365         __le32                  inode_number;
 366         __le64                  start_block;
 367         __le64                  file_size;
 368         __le64                  sparse;
 369         __le32                  nlink;
 370         __le32                  fragment;
 371         __le32                  offset;
 372         __le32                  xattr;
 373         __le16                  block_list[0];
 374 };
 375
 376 struct squashfs_dir_inode {
 377         __le16                  inode_type;
 378         __le16                  mode;
 379         __le16                  uid;
 380         __le16                  guid;
 381         __le32                  mtime;
 382         __le32                  inode_number;
 383         __le32                  start_block;
 384         __le32                  nlink;
 385         __le16                  file_size;
 386         __le16                  offset;
 387         __le32                  parent_inode;
 388 };
 389
 390 struct squashfs_ldir_inode {
 391         __le16                  inode_type;
 392         __le16                  mode;
 393         __le16                  uid;
 394         __le16                  guid;
 395         __le32                  mtime;
 396         __le32                  inode_number;
 397         __le32                  nlink;
 398         __le32                  file_size;
 399         __le32                  start_block;
 400         __le32                  parent_inode;
 401         __le16                  i_count;
 402         __le16                  offset;
 403         __le32                  xattr;
 404         struct squashfs_dir_index       index[0];
 405 };
 406
 407 union squashfs_inode {
 408         struct squashfs_base_inode              base;
 409         struct squashfs_dev_inode               dev;
 410         struct squashfs_ldev_inode              ldev;
 411         struct squashfs_symlink_inode           symlink;
 412         struct squashfs_reg_inode               reg;
 413         struct squashfs_lreg_inode              lreg;
 414         struct squashfs_dir_inode               dir;
 415         struct squashfs_ldir_inode              ldir;
 416         struct squashfs_ipc_inode               ipc;
 417         struct squashfs_lipc_inode              lipc;
 418 };
 419
 420 struct squashfs_dir_entry {
 421         __le16                  offset;
 422         __le16                  inode_number;
 423         __le16                  type;
 424         __le16                  size;
 425         char                    name[0];
 426 };
 427
 428 struct squashfs_dir_header {
 429         __le32                  count;
 430         __le32                  start_block;
 431         __le32                  inode_number;
 432 };
 433
 434 struct squashfs_fragment_entry {
 435         __le64                  start_block;
 436         __le32                  size;
 437         unsigned int            unused;
 438 };
 439
 440 struct squashfs_xattr_entry {
 441         __le16                  type;
 442         __le16                  size;
 443         char                    data[0];
 444 };
 445
 446 struct squashfs_xattr_val {
 447         __le32                  vsize;
 448         char                    value[0];
 449 };
 450
 451 struct squashfs_xattr_id {
 452         __le64                  xattr;
 453         __le32                  count;
 454         __le32                  size;
 455 };
 456
 457 struct squashfs_xattr_id_table {
 458         __le64                  xattr_table_start;
 459         __le32                  xattr_ids;
 460         __le32                  unused;
 461 };
 462
 463 #endif