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@lougher.demon.co.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 #define SQUASHFS_METADATA_LOG 13 34 35 /* default size of data blocks */ 36 #define SQUASHFS_FILE_SIZE 131072 37 #define SQUASHFS_FILE_LOG 17 38 39 #define SQUASHFS_FILE_MAX_SIZE 1048576 40 #define SQUASHFS_FILE_MAX_LOG 20 41 42 /* Max number of uids and gids */ 43 #define SQUASHFS_IDS 65536 44 45 /* Max length of filename (not 255) */ 46 #define SQUASHFS_NAME_LEN 256 47 48 #define SQUASHFS_INVALID_FRAG (0xffffffffU) 49 #define SQUASHFS_INVALID_XATTR (0xffffffffU) 50 #define SQUASHFS_INVALID_BLK (-1LL) 51 52 /* Filesystem flags */ 53 #define SQUASHFS_NOI 0 54 #define SQUASHFS_NOD 1 55 #define SQUASHFS_NOF 3 56 #define SQUASHFS_NO_FRAG 4 57 #define SQUASHFS_ALWAYS_FRAG 5 58 #define SQUASHFS_DUPLICATE 6 59 #define SQUASHFS_EXPORT 7 60 61 #define SQUASHFS_BIT(flag, bit) ((flag >> bit) & 1) 62 63 #define SQUASHFS_UNCOMPRESSED_INODES(flags) SQUASHFS_BIT(flags, \ 64 SQUASHFS_NOI) 65 66 #define SQUASHFS_UNCOMPRESSED_DATA(flags) SQUASHFS_BIT(flags, \ 67 SQUASHFS_NOD) 68 69 #define SQUASHFS_UNCOMPRESSED_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ 70 SQUASHFS_NOF) 71 72 #define SQUASHFS_NO_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ 73 SQUASHFS_NO_FRAG) 74 75 #define SQUASHFS_ALWAYS_FRAGMENTS(flags) SQUASHFS_BIT(flags, \ 76 SQUASHFS_ALWAYS_FRAG) 77 78 #define SQUASHFS_DUPLICATES(flags) SQUASHFS_BIT(flags, \ 79 SQUASHFS_DUPLICATE) 80 81 #define SQUASHFS_EXPORTABLE(flags) SQUASHFS_BIT(flags, \ 82 SQUASHFS_EXPORT) 83 84 /* Max number of types and file types */ 85 #define SQUASHFS_DIR_TYPE 1 86 #define SQUASHFS_REG_TYPE 2 87 #define SQUASHFS_SYMLINK_TYPE 3 88 #define SQUASHFS_BLKDEV_TYPE 4 89 #define SQUASHFS_CHRDEV_TYPE 5 90 #define SQUASHFS_FIFO_TYPE 6 91 #define SQUASHFS_SOCKET_TYPE 7 92 #define SQUASHFS_LDIR_TYPE 8 93 #define SQUASHFS_LREG_TYPE 9 94 #define SQUASHFS_LSYMLINK_TYPE 10 95 #define SQUASHFS_LBLKDEV_TYPE 11 96 #define SQUASHFS_LCHRDEV_TYPE 12 97 #define SQUASHFS_LFIFO_TYPE 13 98 #define SQUASHFS_LSOCKET_TYPE 14 99 100 /* Xattr types */ 101 #define SQUASHFS_XATTR_USER 0 102 #define SQUASHFS_XATTR_TRUSTED 1 103 #define SQUASHFS_XATTR_SECURITY 2 104 #define SQUASHFS_XATTR_VALUE_OOL 256 105 #define SQUASHFS_XATTR_PREFIX_MASK 0xff 106 107 /* Flag whether block is compressed or uncompressed, bit is set if block is 108 * uncompressed */ 109 #define SQUASHFS_COMPRESSED_BIT (1 << 15) 110 111 #define SQUASHFS_COMPRESSED_SIZE(B) (((B) & ~SQUASHFS_COMPRESSED_BIT) ? \ 112 (B) & ~SQUASHFS_COMPRESSED_BIT : SQUASHFS_COMPRESSED_BIT) 113 114 #define SQUASHFS_COMPRESSED(B) (!((B) & SQUASHFS_COMPRESSED_BIT)) 115 116 #define SQUASHFS_COMPRESSED_BIT_BLOCK (1 << 24) 117 118 #define SQUASHFS_COMPRESSED_SIZE_BLOCK(B) ((B) & \ 119 ~SQUASHFS_COMPRESSED_BIT_BLOCK) 120 121 #define SQUASHFS_COMPRESSED_BLOCK(B) (!((B) & SQUASHFS_COMPRESSED_BIT_BLOCK)) 122 123 /* 124 * Inode number ops. Inodes consist of a compressed block number, and an 125 * uncompressed offset within that block 126 */ 127 #define SQUASHFS_INODE_BLK(A) ((unsigned int) ((A) >> 16)) 128 129 #define SQUASHFS_INODE_OFFSET(A) ((unsigned int) ((A) & 0xffff)) 130 131 #define SQUASHFS_MKINODE(A, B) ((long long)(((long long) (A)\ 132 << 16) + (B))) 133 134 /* Translate between VFS mode and squashfs mode */ 135 #define SQUASHFS_MODE(A) ((A) & 0xfff) 136 137 /* fragment and fragment table defines */ 138 #define SQUASHFS_FRAGMENT_BYTES(A) \ 139 ((A) * sizeof(struct squashfs_fragment_entry)) 140 141 #define SQUASHFS_FRAGMENT_INDEX(A) (SQUASHFS_FRAGMENT_BYTES(A) / \ 142 SQUASHFS_METADATA_SIZE) 143 144 #define SQUASHFS_FRAGMENT_INDEX_OFFSET(A) (SQUASHFS_FRAGMENT_BYTES(A) % \ 145 SQUASHFS_METADATA_SIZE) 146 147 #define SQUASHFS_FRAGMENT_INDEXES(A) ((SQUASHFS_FRAGMENT_BYTES(A) + \ 148 SQUASHFS_METADATA_SIZE - 1) / \ 149 SQUASHFS_METADATA_SIZE) 150 151 #define SQUASHFS_FRAGMENT_INDEX_BYTES(A) (SQUASHFS_FRAGMENT_INDEXES(A) *\ 152 sizeof(u64)) 153 154 /* inode lookup table defines */ 155 #define SQUASHFS_LOOKUP_BYTES(A) ((A) * sizeof(u64)) 156 157 #define SQUASHFS_LOOKUP_BLOCK(A) (SQUASHFS_LOOKUP_BYTES(A) / \ 158 SQUASHFS_METADATA_SIZE) 159 160 #define SQUASHFS_LOOKUP_BLOCK_OFFSET(A) (SQUASHFS_LOOKUP_BYTES(A) % \ 161 SQUASHFS_METADATA_SIZE) 162 163 #define SQUASHFS_LOOKUP_BLOCKS(A) ((SQUASHFS_LOOKUP_BYTES(A) + \ 164 SQUASHFS_METADATA_SIZE - 1) / \ 165 SQUASHFS_METADATA_SIZE) 166 167 #define SQUASHFS_LOOKUP_BLOCK_BYTES(A) (SQUASHFS_LOOKUP_BLOCKS(A) *\ 168 sizeof(u64)) 169 170 /* uid/gid lookup table defines */ 171 #define SQUASHFS_ID_BYTES(A) ((A) * sizeof(unsigned int)) 172 173 #define SQUASHFS_ID_BLOCK(A) (SQUASHFS_ID_BYTES(A) / \ 174 SQUASHFS_METADATA_SIZE) 175 176 #define SQUASHFS_ID_BLOCK_OFFSET(A) (SQUASHFS_ID_BYTES(A) % \ 177 SQUASHFS_METADATA_SIZE) 178 179 #define SQUASHFS_ID_BLOCKS(A) ((SQUASHFS_ID_BYTES(A) + \ 180 SQUASHFS_METADATA_SIZE - 1) / \ 181 SQUASHFS_METADATA_SIZE) 182 183 #define SQUASHFS_ID_BLOCK_BYTES(A) (SQUASHFS_ID_BLOCKS(A) *\ 184 sizeof(u64)) 185 /* xattr id lookup table defines */ 186 #define SQUASHFS_XATTR_BYTES(A) ((A) * sizeof(struct squashfs_xattr_id)) 187 188 #define SQUASHFS_XATTR_BLOCK(A) (SQUASHFS_XATTR_BYTES(A) / \ 189 SQUASHFS_METADATA_SIZE) 190 191 #define SQUASHFS_XATTR_BLOCK_OFFSET(A) (SQUASHFS_XATTR_BYTES(A) % \ 192 SQUASHFS_METADATA_SIZE) 193 194 #define SQUASHFS_XATTR_BLOCKS(A) ((SQUASHFS_XATTR_BYTES(A) + \ 195 SQUASHFS_METADATA_SIZE - 1) / \ 196 SQUASHFS_METADATA_SIZE) 197 198 #define SQUASHFS_XATTR_BLOCK_BYTES(A) (SQUASHFS_XATTR_BLOCKS(A) *\ 199 sizeof(u64)) 200 #define SQUASHFS_XATTR_BLK(A) ((unsigned int) ((A) >> 16)) 201 202 #define SQUASHFS_XATTR_OFFSET(A) ((unsigned int) ((A) & 0xffff)) 203 204 /* cached data constants for filesystem */ 205 #define SQUASHFS_CACHED_BLKS 8 206 207 #define SQUASHFS_MAX_FILE_SIZE_LOG 64 208 209 #define SQUASHFS_MAX_FILE_SIZE (1LL << \ 210 (SQUASHFS_MAX_FILE_SIZE_LOG - 2)) 211 212 /* meta index cache */ 213 #define SQUASHFS_META_INDEXES (SQUASHFS_METADATA_SIZE / sizeof(unsigned int)) 214 #define SQUASHFS_META_ENTRIES 127 215 #define SQUASHFS_META_SLOTS 8 216 217 struct meta_entry { 218 u64 data_block; 219 unsigned int index_block; 220 unsigned short offset; 221 unsigned short pad; 222 }; 223 224 struct meta_index { 225 unsigned int inode_number; 226 unsigned int offset; 227 unsigned short entries; 228 unsigned short skip; 229 unsigned short locked; 230 unsigned short pad; 231 struct meta_entry meta_entry[SQUASHFS_META_ENTRIES]; 232 }; 233 234 235 /* 236 * definitions for structures on disk 237 */ 238 #define ZLIB_COMPRESSION 1 239 #define LZMA_COMPRESSION 2 240 #define LZO_COMPRESSION 3 241 #define XZ_COMPRESSION 4 242 243 struct squashfs_super_block { 244 __le32 s_magic; 245 __le32 inodes; 246 __le32 mkfs_time; 247 __le32 block_size; 248 __le32 fragments; 249 __le16 compression; 250 __le16 block_log; 251 __le16 flags; 252 __le16 no_ids; 253 __le16 s_major; 254 __le16 s_minor; 255 __le64 root_inode; 256 __le64 bytes_used; 257 __le64 id_table_start; 258 __le64 xattr_id_table_start; 259 __le64 inode_table_start; 260 __le64 directory_table_start; 261 __le64 fragment_table_start; 262 __le64 lookup_table_start; 263 }; 264 265 struct squashfs_dir_index { 266 __le32 index; 267 __le32 start_block; 268 __le32 size; 269 unsigned char name[0]; 270 }; 271 272 struct squashfs_base_inode { 273 __le16 inode_type; 274 __le16 mode; 275 __le16 uid; 276 __le16 guid; 277 __le32 mtime; 278 __le32 inode_number; 279 }; 280 281 struct squashfs_ipc_inode { 282 __le16 inode_type; 283 __le16 mode; 284 __le16 uid; 285 __le16 guid; 286 __le32 mtime; 287 __le32 inode_number; 288 __le32 nlink; 289 }; 290 291 struct squashfs_lipc_inode { 292 __le16 inode_type; 293 __le16 mode; 294 __le16 uid; 295 __le16 guid; 296 __le32 mtime; 297 __le32 inode_number; 298 __le32 nlink; 299 __le32 xattr; 300 }; 301 302 struct squashfs_dev_inode { 303 __le16 inode_type; 304 __le16 mode; 305 __le16 uid; 306 __le16 guid; 307 __le32 mtime; 308 __le32 inode_number; 309 __le32 nlink; 310 __le32 rdev; 311 }; 312 313 struct squashfs_ldev_inode { 314 __le16 inode_type; 315 __le16 mode; 316 __le16 uid; 317 __le16 guid; 318 __le32 mtime; 319 __le32 inode_number; 320 __le32 nlink; 321 __le32 rdev; 322 __le32 xattr; 323 }; 324 325 struct squashfs_symlink_inode { 326 __le16 inode_type; 327 __le16 mode; 328 __le16 uid; 329 __le16 guid; 330 __le32 mtime; 331 __le32 inode_number; 332 __le32 nlink; 333 __le32 symlink_size; 334 char symlink[0]; 335 }; 336 337 struct squashfs_reg_inode { 338 __le16 inode_type; 339 __le16 mode; 340 __le16 uid; 341 __le16 guid; 342 __le32 mtime; 343 __le32 inode_number; 344 __le32 start_block; 345 __le32 fragment; 346 __le32 offset; 347 __le32 file_size; 348 __le16 block_list[0]; 349 }; 350 351 struct squashfs_lreg_inode { 352 __le16 inode_type; 353 __le16 mode; 354 __le16 uid; 355 __le16 guid; 356 __le32 mtime; 357 __le32 inode_number; 358 __le64 start_block; 359 __le64 file_size; 360 __le64 sparse; 361 __le32 nlink; 362 __le32 fragment; 363 __le32 offset; 364 __le32 xattr; 365 __le16 block_list[0]; 366 }; 367 368 struct squashfs_dir_inode { 369 __le16 inode_type; 370 __le16 mode; 371 __le16 uid; 372 __le16 guid; 373 __le32 mtime; 374 __le32 inode_number; 375 __le32 start_block; 376 __le32 nlink; 377 __le16 file_size; 378 __le16 offset; 379 __le32 parent_inode; 380 }; 381 382 struct squashfs_ldir_inode { 383 __le16 inode_type; 384 __le16 mode; 385 __le16 uid; 386 __le16 guid; 387 __le32 mtime; 388 __le32 inode_number; 389 __le32 nlink; 390 __le32 file_size; 391 __le32 start_block; 392 __le32 parent_inode; 393 __le16 i_count; 394 __le16 offset; 395 __le32 xattr; 396 struct squashfs_dir_index index[0]; 397 }; 398 399 union squashfs_inode { 400 struct squashfs_base_inode base; 401 struct squashfs_dev_inode dev; 402 struct squashfs_ldev_inode ldev; 403 struct squashfs_symlink_inode symlink; 404 struct squashfs_reg_inode reg; 405 struct squashfs_lreg_inode lreg; 406 struct squashfs_dir_inode dir; 407 struct squashfs_ldir_inode ldir; 408 struct squashfs_ipc_inode ipc; 409 struct squashfs_lipc_inode lipc; 410 }; 411 412 struct squashfs_dir_entry { 413 __le16 offset; 414 __le16 inode_number; 415 __le16 type; 416 __le16 size; 417 char name[0]; 418 }; 419 420 struct squashfs_dir_header { 421 __le32 count; 422 __le32 start_block; 423 __le32 inode_number; 424 }; 425 426 struct squashfs_fragment_entry { 427 __le64 start_block; 428 __le32 size; 429 unsigned int unused; 430 }; 431 432 struct squashfs_xattr_entry { 433 __le16 type; 434 __le16 size; 435 char data[0]; 436 }; 437 438 struct squashfs_xattr_val { 439 __le32 vsize; 440 char value[0]; 441 }; 442 443 struct squashfs_xattr_id { 444 __le64 xattr; 445 __le32 count; 446 __le32 size; 447 }; 448 449 struct squashfs_xattr_id_table { 450 __le64 xattr_table_start; 451 __le32 xattr_ids; 452 __le32 unused; 453 }; 454 455 #endif 456