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 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 */ 73struct 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 80struct 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 */ 93struct 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 */ 116struct 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 130struct ext2_dx_entry { 131 uint32_t hash; 132 uint32_t block; 133}; 134 135struct 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 EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */ 186#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 187 188#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 189#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */ 190 191/* 192 * ioctl commands 193 */ 194#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 195#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 196#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 197#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 198 199/* 200 * Structure of an inode on the disk 201 */ 202struct ext2_inode { 203 uint16_t i_mode; /* File mode */ 204 uint16_t i_uid; /* Low 16 bits of Owner Uid */ 205 uint32_t i_size; /* Size in bytes */ 206 uint32_t i_atime; /* Access time */ 207 uint32_t i_ctime; /* Creation time */ 208 uint32_t i_mtime; /* Modification time */ 209 uint32_t i_dtime; /* Deletion Time */ 210 uint16_t i_gid; /* Low 16 bits of Group Id */ 211 uint16_t i_links_count; /* Links count */ 212 uint32_t i_blocks; /* Blocks count */ 213 uint32_t i_flags; /* File flags */ 214 union { 215 struct { 216 uint32_t l_i_reserved1; 217 } linux1; 218 struct { 219 uint32_t h_i_translator; 220 } hurd1; 221 struct { 222 uint32_t m_i_reserved1; 223 } masix1; 224 } osd1; /* OS dependent 1 */ 225 uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 226 uint32_t i_generation; /* File version (for NFS) */ 227 uint32_t i_file_acl; /* File ACL */ 228 uint32_t i_dir_acl; /* Directory ACL */ 229 uint32_t i_faddr; /* Fragment address */ 230 union { 231 struct { 232 uint8_t l_i_frag; /* Fragment number */ 233 uint8_t l_i_fsize; /* Fragment size */ 234 uint16_t i_pad1; 235 uint16_t l_i_uid_high; /* these 2 fields */ 236 uint16_t l_i_gid_high; /* were reserved2[0] */ 237 uint32_t l_i_reserved2; 238 } linux2; 239 struct { 240 uint8_t h_i_frag; /* Fragment number */ 241 uint8_t h_i_fsize; /* Fragment size */ 242 uint16_t h_i_mode_high; 243 uint16_t h_i_uid_high; 244 uint16_t h_i_gid_high; 245 uint32_t h_i_author; 246 } hurd2; 247 struct { 248 uint8_t m_i_frag; /* Fragment number */ 249 uint8_t m_i_fsize; /* Fragment size */ 250 uint16_t m_pad1; 251 uint32_t m_i_reserved2[2]; 252 } masix2; 253 } osd2; /* OS dependent 2 */ 254}; 255 256/* 257 * Permanent part of an large inode on the disk 258 */ 259struct ext2_inode_large { 260 uint16_t i_mode; /* File mode */ 261 uint16_t i_uid; /* Low 16 bits of Owner Uid */ 262 uint32_t i_size; /* Size in bytes */ 263 uint32_t i_atime; /* Access time */ 264 uint32_t i_ctime; /* Creation time */ 265 uint32_t i_mtime; /* Modification time */ 266 uint32_t i_dtime; /* Deletion Time */ 267 uint16_t i_gid; /* Low 16 bits of Group Id */ 268 uint16_t i_links_count; /* Links count */ 269 uint32_t i_blocks; /* Blocks count */ 270 uint32_t i_flags; /* File flags */ 271 union { 272 struct { 273 uint32_t l_i_reserved1; 274 } linux1; 275 struct { 276 uint32_t h_i_translator; 277 } hurd1; 278 struct { 279 uint32_t m_i_reserved1; 280 } masix1; 281 } osd1; /* OS dependent 1 */ 282 uint32_t i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 283 uint32_t i_generation; /* File version (for NFS) */ 284 uint32_t i_file_acl; /* File ACL */ 285 uint32_t i_dir_acl; /* Directory ACL */ 286 uint32_t i_faddr; /* Fragment address */ 287 union { 288 struct { 289 uint8_t l_i_frag; /* Fragment number */ 290 uint8_t l_i_fsize; /* Fragment size */ 291 uint16_t i_pad1; 292 uint16_t l_i_uid_high; /* these 2 fields */ 293 uint16_t l_i_gid_high; /* were reserved2[0] */ 294 uint32_t l_i_reserved2; 295 } linux2; 296 struct { 297 uint8_t h_i_frag; /* Fragment number */ 298 uint8_t h_i_fsize; /* Fragment size */ 299 uint16_t h_i_mode_high; 300 uint16_t h_i_uid_high; 301 uint16_t h_i_gid_high; 302 uint32_t h_i_author; 303 } hurd2; 304 struct { 305 uint8_t m_i_frag; /* Fragment number */ 306 uint8_t m_i_fsize; /* Fragment size */ 307 uint16_t m_pad1; 308 uint32_t m_i_reserved2[2]; 309 } masix2; 310 } osd2; /* OS dependent 2 */ 311 uint16_t i_extra_isize; 312 uint16_t i_pad1; 313}; 314 315#define i_size_high i_dir_acl 316 317/* 318 * File system states 319 */ 320#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 321#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 322 323/* 324 * Mount flags 325 */ 326#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 327#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 328#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 329#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 330#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 331#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 332#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 333#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 334 335#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 336#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 337#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 338 EXT2_MOUNT_##opt) 339/* 340 * Maximal mount counts between two filesystem checks 341 */ 342#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 343#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 344 345/* 346 * Behaviour when detecting errors 347 */ 348#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 349#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 350#define EXT2_ERRORS_PANIC 3 /* Panic */ 351#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 352 353/* 354 * Structure of the super block 355 */ 356struct ext2_super_block { 357 uint32_t s_inodes_count; /* Inodes count */ 358 uint32_t s_blocks_count; /* Blocks count */ 359 uint32_t s_r_blocks_count; /* Reserved blocks count */ 360 uint32_t s_free_blocks_count; /* Free blocks count */ 361 uint32_t s_free_inodes_count; /* Free inodes count */ 362 uint32_t s_first_data_block; /* First Data Block */ 363 uint32_t s_log_block_size; /* Block size */ 364 int32_t s_log_frag_size; /* Fragment size */ 365 uint32_t s_blocks_per_group; /* # Blocks per group */ 366 uint32_t s_frags_per_group; /* # Fragments per group */ 367 uint32_t s_inodes_per_group; /* # Inodes per group */ 368 uint32_t s_mtime; /* Mount time */ 369 uint32_t s_wtime; /* Write time */ 370 uint16_t s_mnt_count; /* Mount count */ 371 int16_t s_max_mnt_count; /* Maximal mount count */ 372 uint16_t s_magic; /* Magic signature */ 373 uint16_t s_state; /* File system state */ 374 uint16_t s_errors; /* Behaviour when detecting errors */ 375 uint16_t s_minor_rev_level; /* minor revision level */ 376 uint32_t s_lastcheck; /* time of last check */ 377 uint32_t s_checkinterval; /* max. time between checks */ 378 uint32_t s_creator_os; /* OS */ 379 uint32_t s_rev_level; /* Revision level */ 380 uint16_t s_def_resuid; /* Default uid for reserved blocks */ 381 uint16_t s_def_resgid; /* Default gid for reserved blocks */ 382 /* 383 * These fields are for EXT2_DYNAMIC_REV superblocks only. 384 * 385 * Note: the difference between the compatible feature set and 386 * the incompatible feature set is that if there is a bit set 387 * in the incompatible feature set that the kernel doesn't 388 * know about, it should refuse to mount the filesystem. 389 * 390 * e2fsck's requirements are more strict; if it doesn't know 391 * about a feature in either the compatible or incompatible 392 * feature set, it must abort and not try to meddle with 393 * things it doesn't understand... 394 */ 395 uint32_t s_first_ino; /* First non-reserved inode */ 396 uint16_t s_inode_size; /* size of inode structure */ 397 uint16_t s_block_group_nr; /* block group # of this superblock */ 398 uint32_t s_feature_compat; /* compatible feature set */ 399 uint32_t s_feature_incompat; /* incompatible feature set */ 400 uint32_t s_feature_ro_compat; /* readonly-compatible feature set */ 401 uint8_t s_uuid[16]; /* 128-bit uuid for volume */ 402 char s_volume_name[16]; /* volume name */ 403 char s_last_mounted[64]; /* directory where last mounted */ 404 uint32_t s_algorithm_usage_bitmap; /* For compression */ 405 /* 406 * Performance hints. Directory preallocation should only 407 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 408 */ 409 uint8_t s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 410 uint8_t s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 411 uint16_t s_reserved_gdt_blocks; /* Per group table for online growth */ 412 /* 413 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 414 */ 415 uint8_t s_journal_uuid[16]; /* uuid of journal superblock */ 416 uint32_t s_journal_inum; /* inode number of journal file */ 417 uint32_t s_journal_dev; /* device number of journal file */ 418 uint32_t s_last_orphan; /* start of list of inodes to delete */ 419 uint32_t s_hash_seed[4]; /* HTREE hash seed */ 420 uint8_t s_def_hash_version; /* Default hash version to use */ 421 uint8_t s_jnl_backup_type; /* Default type of journal backup */ 422 uint16_t s_reserved_word_pad; 423 uint32_t s_default_mount_opts; 424 uint32_t s_first_meta_bg; /* First metablock group */ 425 uint32_t s_mkfs_time; /* When the filesystem was created */ 426 uint32_t s_jnl_blocks[17]; /* Backup of the journal inode */ 427 uint32_t s_reserved[172]; /* Padding to the end of the block */ 428}; 429 430/* 431 * Codes for operating systems 432 */ 433#define EXT2_OS_LINUX 0 434#define EXT2_OS_HURD 1 435#define EXT2_OS_MASIX 2 436#define EXT2_OS_FREEBSD 3 437#define EXT2_OS_LITES 4 438 439/* 440 * Revision levels 441 */ 442#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 443#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 444 445#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 446#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 447 448#define EXT2_GOOD_OLD_INODE_SIZE 128 449 450/* 451 * Journal inode backup types 452 */ 453#define EXT3_JNL_BACKUP_BLOCKS 1 454 455/* 456 * Feature set definitions 457 */ 458 459#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 460 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 461#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 462 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 463#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 464 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 465 466#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 467#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 468#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 469#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 470#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 471#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 472 473#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 474#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 475/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 476 477#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 478#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 479#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 480#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 481#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 482#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 483 484 485#define EXT2_FEATURE_COMPAT_SUPP 0 486#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 487#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 488 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 489 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 490 491/* 492 * Default values for user and/or group using reserved blocks 493 */ 494#define EXT2_DEF_RESUID 0 495#define EXT2_DEF_RESGID 0 496 497/* 498 * Default mount options 499 */ 500#define EXT2_DEFM_DEBUG 0x0001 501#define EXT2_DEFM_BSDGROUPS 0x0002 502#define EXT2_DEFM_XATTR_USER 0x0004 503#define EXT2_DEFM_ACL 0x0008 504#define EXT2_DEFM_UID16 0x0010 505#define EXT3_DEFM_JMODE 0x0060 506#define EXT3_DEFM_JMODE_DATA 0x0020 507#define EXT3_DEFM_JMODE_ORDERED 0x0040 508#define EXT3_DEFM_JMODE_WBACK 0x0060 509 510/* 511 * Structure of a directory entry 512 */ 513#define EXT2_NAME_LEN 255 514 515struct ext2_dir_entry { 516 uint32_t inode; /* Inode number */ 517 uint16_t rec_len; /* Directory entry length */ 518 uint16_t name_len; /* Name length */ 519 char name[EXT2_NAME_LEN]; /* File name */ 520}; 521 522/* 523 * The new version of the directory entry. Since EXT2 structures are 524 * stored in intel byte order, and the name_len field could never be 525 * bigger than 255 chars, it's safe to reclaim the extra byte for the 526 * file_type field. 527 */ 528struct ext2_dir_entry_2 { 529 uint32_t inode; /* Inode number */ 530 uint16_t rec_len; /* Directory entry length */ 531 uint8_t name_len; /* Name length */ 532 uint8_t file_type; 533 char name[EXT2_NAME_LEN]; /* File name */ 534}; 535 536/* 537 * Ext2 directory file types. Only the low 3 bits are used. The 538 * other bits are reserved for now. 539 */ 540#define EXT2_FT_UNKNOWN 0 541#define EXT2_FT_REG_FILE 1 542#define EXT2_FT_DIR 2 543#define EXT2_FT_CHRDEV 3 544#define EXT2_FT_BLKDEV 4 545#define EXT2_FT_FIFO 5 546#define EXT2_FT_SOCK 6 547#define EXT2_FT_SYMLINK 7 548 549#define EXT2_FT_MAX 8 550 551/* 552 * EXT2_DIR_PAD defines the directory entries boundaries 553 * 554 * NOTE: It must be a multiple of 4 555 */ 556#define EXT2_DIR_PAD 4 557#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 558#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 559 ~EXT2_DIR_ROUND) 560 561#endif /* _LINUX_EXT2_FS_H */ 562