1 /* vi: set sw=4 ts=4: */ 2 /* 3 * linux/include/linux/ext2_fs.h 4 * 5 * Copyright (C) 1992, 1993, 1994, 1995 6 * Remy Card (card@masi.ibp.fr) 7 * Laboratoire MASI - Institut Blaise Pascal 8 * Universite Pierre et Marie Curie (Paris VI) 9 * 10 * Copyright (C) 1991, 1992 Linus Torvalds 11 */ 12 13 #ifndef LINUX_EXT2_FS_H 14 #define LINUX_EXT2_FS_H 1 15 16 /* 17 * Special inode numbers 18 */ 19 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 20 #define EXT2_ROOT_INO 2 /* Root inode */ 21 #define EXT2_ACL_IDX_INO 3 /* ACL inode */ 22 #define EXT2_ACL_DATA_INO 4 /* ACL inode */ 23 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 24 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 25 #define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 26 #define EXT2_JOURNAL_INO 8 /* Journal inode */ 27 28 /* First non-reserved inode for old ext2 filesystems */ 29 #define EXT2_GOOD_OLD_FIRST_INO 11 30 31 /* 32 * The second extended file system magic number 33 */ 34 #define EXT2_SUPER_MAGIC 0xEF53 35 36 /* Assume that user mode programs are passing in an ext2fs superblock, not 37 * a kernel struct super_block. This will allow us to call the feature-test 38 * macros from user land. */ 39 #define EXT2_SB(sb) (sb) 40 41 /* 42 * Maximal count of links to a file 43 */ 44 #define EXT2_LINK_MAX 32000 45 46 /* 47 * Macro-instructions used to manage several block sizes 48 */ 49 #define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 50 #define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 51 #define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 52 #define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 53 #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 54 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 55 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 56 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 57 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 58 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 59 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(uint32_t)) 60 61 /* 62 * Macro-instructions used to manage fragments 63 */ 64 #define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 65 #define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 66 #define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 67 #define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 68 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 69 70 /* 71 * ACL structures 72 */ 73 struct ext2_acl_header { /* Header of Access Control Lists */ 74 uint32_t aclh_size; 75 uint32_t aclh_file_count; 76 uint32_t aclh_acle_count; 77 uint32_t aclh_first_acle; 78 }; 79 80 struct ext2_acl_entry { /* Access Control List Entry */ 81 uint32_t acle_size; 82 uint16_t acle_perms; /* Access permissions */ 83 uint16_t acle_type; /* Type of entry */ 84 uint16_t acle_tag; /* User or group identity */ 85 uint16_t acle_pad1; 86 uint32_t acle_next; /* Pointer on next entry for the */ 87 /* same inode or on next free entry */ 88 }; 89 90 /* 91 * Structure of a blocks group descriptor 92 */ 93 struct ext2_group_desc { 94 uint32_t bg_block_bitmap; /* Blocks bitmap block */ 95 uint32_t bg_inode_bitmap; /* Inodes bitmap block */ 96 uint32_t bg_inode_table; /* Inodes table block */ 97 uint16_t bg_free_blocks_count; /* Free blocks count */ 98 uint16_t bg_free_inodes_count; /* Free inodes count */ 99 uint16_t bg_used_dirs_count; /* Directories count */ 100 uint16_t bg_pad; 101 uint32_t bg_reserved[3]; 102 }; 103 104 /* 105 * Data structures used by the directory indexing feature 106 * 107 * Note: all of the multibyte integer fields are little endian. 108 */ 109 110 /* 111 * Note: dx_root_info is laid out so that if it should somehow get 112 * overlaid by a dirent the two low bits of the hash version will be 113 * zero. Therefore, the hash version mod 4 should never be 0. 114 * Sincerely, the paranoia department. 115 */ 116 struct ext2_dx_root_info { 117 uint32_t reserved_zero; 118 uint8_t hash_version; /* 0 now, 1 at release */ 119 uint8_t info_length; /* 8 */ 120 uint8_t indirect_levels; 121 uint8_t unused_flags; 122 }; 123 124 #define EXT2_HASH_LEGACY 0 125 #define EXT2_HASH_HALF_MD4 1 126 #define EXT2_HASH_TEA 2 127 128 #define EXT2_HASH_FLAG_INCOMPAT 0x1 129 130 struct ext2_dx_entry { 131 uint32_t hash; 132 uint32_t block; 133 }; 134 135 struct ext2_dx_countlimit { 136 uint16_t limit; 137 uint16_t count; 138 }; 139 140 141 /* 142 * Macro-instructions used to manage group descriptors 143 */ 144 #define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 145 #define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 146 #define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 147 /* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 148 #define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 149 #define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 150 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 151 152 /* 153 * Constants relative to the data blocks 154 */ 155 #define EXT2_NDIR_BLOCKS 12 156 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 157 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 158 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 159 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 160 161 /* 162 * Inode flags 163 */ 164 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 165 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 166 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 167 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 168 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 169 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 170 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 171 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 172 /* Reserved for compression usage... */ 173 #define EXT2_DIRTY_FL 0x00000100 174 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 175 #define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 176 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 177 /* End compression flags --- maybe not all used */ 178 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 179 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 180 #define EXT2_IMAGIC_FL 0x00002000 181 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 182 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 183 #define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 184 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 185 #define EXT2_EXTENT_FL 0x00080000 /* Extents */ 186 #define EXT2_VERITY_FL 0x00100000 187 #define EXT2_NOCOW_FL 0x00800000 /* Do not cow file */ 188 #define EXT2_INLINE_DATA_FL 0x10000000 189 #define EXT2_PROJINHERIT_FL 0x20000000 190 #define EXT2_CASEFOLD_FL 0x40000000 191 192 /* 193 * ioctl commands 194 */ 195 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 196 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 197 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 198 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 199 //NB: despite "long" in defs above, these ioctls use an _int_! 200 //passing them a pointer to long will read/write only int-sized data! 201 struct ext2_fsxattr { 202 uint32_t fsx_xflags; /* xflags field value (get/set) */ 203 uint32_t fsx_extsize; /* extsize field value (get/set)*/ 204 uint32_t fsx_nextents; /* nextents field value (get) */ 205 uint32_t fsx_projid; /* project identifier (get/set) */ 206 uint32_t fsx_cowextsize; /* CoW extsize field value (get/set)*/ 207 unsigned char fsx_pad[8]; 208 }; 209 #define EXT2_IOC_FSGETXATTR _IOR('X', 31, struct ext2_fsxattr) 210 #define EXT2_IOC_FSSETXATTR _IOW('X', 32, struct ext2_fsxattr) 211 212 /* 213 * Structure of an inode on the disk 214 */ 215 struct ext2_inode { 216 uint16_t i_mode; /* File mode */ 217 uint16_t i_uid; /* Low 16 bits of Owner Uid */ 218 uint32_t i_size; /* Size in bytes */ 219 uint32_t i_atime; /* Access time */ 220 uint32_t i_ctime; /* Creation time */ 221 uint32_t i_mtime; /* Modification time */ 222 uint32_t i_dtime; /* Deletion Time */ 223 uint16_t i_gid; /* Low 16 bits of Group Id */ 224 uint16_t i_links_count; /* Links count */ 225 uint32_t i_blocks; /* Blocks count */ 226 uint32_t i_flags; /* File flags */ 227 union { 228 struct { 229 uint32_t l_i_reserved1; 230 } linux1; 231 struct { 232 uint32_t h_i_translator; 233 } hurd1; 234 struct { 235 uint32_t m_i_reserved1; 236 } masix1; 237 } osd1; /* OS dependent 1 */ 238 uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 239 uint32_t i_generation; /* File version (for NFS) */ 240 uint32_t i_file_acl; /* File ACL */ 241 uint32_t i_dir_acl; /* Directory ACL */ 242 uint32_t i_faddr; /* Fragment address */ 243 union { 244 struct { 245 uint8_t l_i_frag; /* Fragment number */ 246 uint8_t l_i_fsize; /* Fragment size */ 247 uint16_t i_pad1; 248 uint16_t l_i_uid_high; /* these 2 fields */ 249 uint16_t l_i_gid_high; /* were reserved2[0] */ 250 uint32_t l_i_reserved2; 251 } linux2; 252 struct { 253 uint8_t h_i_frag; /* Fragment number */ 254 uint8_t h_i_fsize; /* Fragment size */ 255 uint16_t h_i_mode_high; 256 uint16_t h_i_uid_high; 257 uint16_t h_i_gid_high; 258 uint32_t h_i_author; 259 } hurd2; 260 struct { 261 uint8_t m_i_frag; /* Fragment number */ 262 uint8_t m_i_fsize; /* Fragment size */ 263 uint16_t m_pad1; 264 uint32_t m_i_reserved2[2]; 265 } masix2; 266 } osd2; /* OS dependent 2 */ 267 }; 268 269 /* 270 * Permanent part of an large inode on the disk 271 */ 272 struct ext2_inode_large { 273 uint16_t i_mode; /* File mode */ 274 uint16_t i_uid; /* Low 16 bits of Owner Uid */ 275 uint32_t i_size; /* Size in bytes */ 276 uint32_t i_atime; /* Access time */ 277 uint32_t i_ctime; /* Creation time */ 278 uint32_t i_mtime; /* Modification time */ 279 uint32_t i_dtime; /* Deletion Time */ 280 uint16_t i_gid; /* Low 16 bits of Group Id */ 281 uint16_t i_links_count; /* Links count */ 282 uint32_t i_blocks; /* Blocks count */ 283 uint32_t i_flags; /* File flags */ 284 union { 285 struct { 286 uint32_t l_i_reserved1; 287 } linux1; 288 struct { 289 uint32_t h_i_translator; 290 } hurd1; 291 struct { 292 uint32_t m_i_reserved1; 293 } masix1; 294 } osd1; /* OS dependent 1 */ 295 uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 296 uint32_t i_generation; /* File version (for NFS) */ 297 uint32_t i_file_acl; /* File ACL */ 298 uint32_t i_dir_acl; /* Directory ACL */ 299 uint32_t i_faddr; /* Fragment address */ 300 union { 301 struct { 302 uint8_t l_i_frag; /* Fragment number */ 303 uint8_t l_i_fsize; /* Fragment size */ 304 uint16_t i_pad1; 305 uint16_t l_i_uid_high; /* these 2 fields */ 306 uint16_t l_i_gid_high; /* were reserved2[0] */ 307 uint32_t l_i_reserved2; 308 } linux2; 309 struct { 310 uint8_t h_i_frag; /* Fragment number */ 311 uint8_t h_i_fsize; /* Fragment size */ 312 uint16_t h_i_mode_high; 313 uint16_t h_i_uid_high; 314 uint16_t h_i_gid_high; 315 uint32_t h_i_author; 316 } hurd2; 317 struct { 318 uint8_t m_i_frag; /* Fragment number */ 319 uint8_t m_i_fsize; /* Fragment size */ 320 uint16_t m_pad1; 321 uint32_t m_i_reserved2[2]; 322 } masix2; 323 } osd2; /* OS dependent 2 */ 324 uint16_t i_extra_isize; 325 uint16_t i_pad1; 326 }; 327 328 #define i_size_high i_dir_acl 329 330 /* 331 * File system states 332 */ 333 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 334 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 335 336 /* 337 * Mount flags 338 */ 339 #define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 340 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 341 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 342 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 343 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 344 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 345 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 346 #define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 347 348 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 349 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 350 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 351 EXT2_MOUNT_##opt) 352 /* 353 * Maximal mount counts between two filesystem checks 354 */ 355 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 356 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 357 358 /* 359 * Behaviour when detecting errors 360 */ 361 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 362 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 363 #define EXT2_ERRORS_PANIC 3 /* Panic */ 364 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 365 366 /* 367 * Structure of the super block 368 */ 369 struct ext2_super_block { 370 uint32_t s_inodes_count; /* Inodes count */ 371 uint32_t s_blocks_count; /* Blocks count */ 372 uint32_t s_r_blocks_count; /* Reserved blocks count */ 373 uint32_t s_free_blocks_count; /* Free blocks count */ 374 uint32_t s_free_inodes_count; /* Free inodes count */ 375 uint32_t s_first_data_block; /* First Data Block */ 376 uint32_t s_log_block_size; /* Block size */ 377 int32_t s_log_frag_size; /* Fragment size */ 378 uint32_t s_blocks_per_group; /* # Blocks per group */ 379 uint32_t s_frags_per_group; /* # Fragments per group */ 380 uint32_t s_inodes_per_group; /* # Inodes per group */ 381 uint32_t s_mtime; /* Mount time */ 382 uint32_t s_wtime; /* Write time */ 383 uint16_t s_mnt_count; /* Mount count */ 384 int16_t s_max_mnt_count; /* Maximal mount count */ 385 uint16_t s_magic; /* Magic signature */ 386 uint16_t s_state; /* File system state */ 387 uint16_t s_errors; /* Behaviour when detecting errors */ 388 uint16_t s_minor_rev_level; /* minor revision level */ 389 uint32_t s_lastcheck; /* time of last check */ 390 uint32_t s_checkinterval; /* max. time between checks */ 391 uint32_t s_creator_os; /* OS */ 392 uint32_t s_rev_level; /* Revision level */ 393 uint16_t s_def_resuid; /* Default uid for reserved blocks */ 394 uint16_t s_def_resgid; /* Default gid for reserved blocks */ 395 /* 396 * These fields are for EXT2_DYNAMIC_REV superblocks only. 397 * 398 * Note: the difference between the compatible feature set and 399 * the incompatible feature set is that if there is a bit set 400 * in the incompatible feature set that the kernel doesn't 401 * know about, it should refuse to mount the filesystem. 402 * 403 * e2fsck's requirements are more strict; if it doesn't know 404 * about a feature in either the compatible or incompatible 405 * feature set, it must abort and not try to meddle with 406 * things it doesn't understand... 407 */ 408 uint32_t s_first_ino; /* First non-reserved inode */ 409 uint16_t s_inode_size; /* size of inode structure */ 410 uint16_t s_block_group_nr; /* block group # of this superblock */ 411 uint32_t s_feature_compat; /* compatible feature set */ 412 uint32_t s_feature_incompat; /* incompatible feature set */ 413 uint32_t s_feature_ro_compat; /* readonly-compatible feature set */ 414 uint8_t s_uuid[16]; /* 128-bit uuid for volume */ 415 char s_volume_name[16]; /* volume name */ 416 char s_last_mounted[64]; /* directory where last mounted */ 417 uint32_t s_algorithm_usage_bitmap; /* For compression */ 418 /* 419 * Performance hints. Directory preallocation should only 420 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 421 */ 422 uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 423 uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 424 uint16_t s_reserved_gdt_blocks; /* Per group table for online growth */ 425 /* 426 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 427 */ 428 /*D0*/ uint8_t s_journal_uuid[16]; /* uuid of journal superblock */ 429 /*E0*/ uint32_t s_journal_inum; /* inode number of journal file */ 430 uint32_t s_journal_dev; /* device number of journal file */ 431 uint32_t s_last_orphan; /* start of list of inodes to delete */ 432 uint32_t s_hash_seed[4]; /* HTREE hash seed */ 433 uint8_t s_def_hash_version; /* Default hash version to use */ 434 uint8_t s_jnl_backup_type; /* Default type of journal backup */ 435 uint16_t s_reserved_word_pad; 436 /*100*/ uint32_t s_default_mount_opts; 437 uint32_t s_first_meta_bg; /* First metablock group */ 438 /* ext3 additions */ 439 uint32_t s_mkfs_time; /* When the filesystem was created */ 440 uint32_t s_jnl_blocks[17]; /* Backup of the journal inode */ 441 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */ 442 /*150*/ uint32_t s_blocks_count_hi; /* Blocks count */ 443 uint32_t s_r_blocks_count_hi; /* Reserved blocks count */ 444 uint32_t s_free_blocks_count_hi; /* Free blocks count */ 445 uint16_t s_min_extra_isize; /* All inodes have at least # bytes */ 446 uint16_t s_want_extra_isize; /* New inodes should reserve # bytes */ 447 uint32_t s_flags; /* Miscellaneous flags */ 448 uint16_t s_raid_stride; /* RAID stride */ 449 uint16_t s_mmp_interval; /* # seconds to wait in MMP checking */ 450 uint64_t s_mmp_block; /* Block for multi-mount protection */ 451 uint32_t s_raid_stripe_width; /* blocks on all data disks (N*stride)*/ 452 uint8_t s_log_groups_per_flex; /* FLEX_BG group size */ 453 uint8_t s_reserved_char_pad2; 454 uint16_t s_reserved_pad; 455 uint32_t s_reserved[162]; /* Padding to the end of the block */ 456 }; 457 struct BUG_ext2_super_block { 458 char bug[sizeof(struct ext2_super_block) == 1024 ? 1 : -1]; 459 }; 460 461 /* 462 * Codes for operating systems 463 */ 464 #define EXT2_OS_LINUX 0 465 #define EXT2_OS_HURD 1 466 #define EXT2_OS_MASIX 2 467 #define EXT2_OS_FREEBSD 3 468 #define EXT2_OS_LITES 4 469 470 /* 471 * Revision levels 472 */ 473 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 474 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 475 476 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 477 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 478 479 #define EXT2_GOOD_OLD_INODE_SIZE 128 480 481 /* 482 * Journal inode backup types 483 */ 484 #define EXT3_JNL_BACKUP_BLOCKS 1 485 486 /* 487 * Feature set definitions 488 */ 489 490 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 491 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 492 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 493 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 494 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 495 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 496 497 /* for s_feature_compat */ 498 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 499 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 500 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 501 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 502 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 503 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 504 505 /* for s_feature_ro_compat */ 506 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 507 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 508 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 /* not used */ 509 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008 510 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010 511 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020 512 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040 513 514 /* for s_feature_incompat */ 515 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 516 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 517 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 518 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 519 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 520 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 521 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080 522 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100 523 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200 524 525 526 #define EXT2_FEATURE_COMPAT_SUPP 0 527 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 528 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 529 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 530 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 531 EXT2_FEATURE_INCOMPAT_META_BG) 532 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED (~EXT2_FEATURE_INCOMPAT_SUPP) 533 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED (~EXT2_FEATURE_RO_COMPAT_SUPP) 534 535 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 536 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 537 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 538 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 539 EXT3_FEATURE_INCOMPAT_RECOVER| \ 540 EXT2_FEATURE_INCOMPAT_META_BG) 541 #define EXT3_FEATURE_INCOMPAT_UNSUPPORTED (~EXT3_FEATURE_INCOMPAT_SUPP) 542 #define EXT3_FEATURE_RO_COMPAT_UNSUPPORTED (~EXT3_FEATURE_RO_COMPAT_SUPP) 543 544 545 /* 546 * Default values for user and/or group using reserved blocks 547 */ 548 #define EXT2_DEF_RESUID 0 549 #define EXT2_DEF_RESGID 0 550 551 /* 552 * Default mount options 553 */ 554 #define EXT2_DEFM_DEBUG 0x0001 555 #define EXT2_DEFM_BSDGROUPS 0x0002 556 #define EXT2_DEFM_XATTR_USER 0x0004 557 #define EXT2_DEFM_ACL 0x0008 558 #define EXT2_DEFM_UID16 0x0010 559 #define EXT3_DEFM_JMODE 0x0060 560 #define EXT3_DEFM_JMODE_DATA 0x0020 561 #define EXT3_DEFM_JMODE_ORDERED 0x0040 562 #define EXT3_DEFM_JMODE_WBACK 0x0060 563 564 /* 565 * Structure of a directory entry 566 */ 567 #define EXT2_NAME_LEN 255 568 569 struct ext2_dir_entry { 570 uint32_t inode; /* Inode number */ 571 uint16_t rec_len; /* Directory entry length */ 572 uint16_t name_len; /* Name length */ 573 char name[EXT2_NAME_LEN]; /* File name */ 574 }; 575 576 /* 577 * The new version of the directory entry. Since EXT2 structures are 578 * stored in intel byte order, and the name_len field could never be 579 * bigger than 255 chars, it's safe to reclaim the extra byte for the 580 * file_type field. 581 */ 582 struct ext2_dir_entry_2 { 583 uint32_t inode; /* Inode number */ 584 uint16_t rec_len; /* Directory entry length */ 585 uint8_t name_len; /* Name length */ 586 uint8_t file_type; 587 char name[EXT2_NAME_LEN]; /* File name */ 588 }; 589 590 /* 591 * Ext2 directory file types. Only the low 3 bits are used. The 592 * other bits are reserved for now. 593 */ 594 #define EXT2_FT_UNKNOWN 0 595 #define EXT2_FT_REG_FILE 1 596 #define EXT2_FT_DIR 2 597 #define EXT2_FT_CHRDEV 3 598 #define EXT2_FT_BLKDEV 4 599 #define EXT2_FT_FIFO 5 600 #define EXT2_FT_SOCK 6 601 #define EXT2_FT_SYMLINK 7 602 603 #define EXT2_FT_MAX 8 604 605 /* 606 * EXT2_DIR_PAD defines the directory entries boundaries 607 * 608 * NOTE: It must be a multiple of 4 609 */ 610 #define EXT2_DIR_PAD 4 611 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 612 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 613 ~EXT2_DIR_ROUND) 614 615 #endif 616