1 /* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@masi.ibp.fr) 6 * Laboratoire MASI - Institut Blaise Pascal 7 * Universite Pierre et Marie Curie (Paris VI) 8 * 9 * from 10 * 11 * linux/include/linux/minix_fs.h 12 * 13 * Copyright (C) 1991, 1992 Linus Torvalds 14 */ 15 16 #ifndef _LINUX_EXT2_FS_H 17 #define _LINUX_EXT2_FS_H 18 19 #include <linux/types.h> 20 #include <linux/magic.h> 21 22 /* 23 * The second extended filesystem constants/structures 24 */ 25 26 /* 27 * Define EXT2FS_DEBUG to produce debug messages 28 */ 29 #undef EXT2FS_DEBUG 30 31 /* 32 * Define EXT2_RESERVATION to reserve data blocks for expanding files 33 */ 34 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 36 #define EXT2_MAX_RESERVE_BLOCKS 1027 37 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 38 /* 39 * The second extended file system version 40 */ 41 #define EXT2FS_DATE "95/08/09" 42 #define EXT2FS_VERSION "0.5b" 43 44 /* 45 * Debug code 46 */ 47 #ifdef EXT2FS_DEBUG 48 # define ext2_debug(f, a...) { \ 49 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 50 __FILE__, __LINE__, __FUNCTION__); \ 51 printk (f, ## a); \ 52 } 53 #else 54 # define ext2_debug(f, a...) /**/ 55 #endif 56 57 /* 58 * Special inode numbers 59 */ 60 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 61 #define EXT2_ROOT_INO 2 /* Root inode */ 62 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 63 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 64 65 /* First non-reserved inode for old ext2 filesystems */ 66 #define EXT2_GOOD_OLD_FIRST_INO 11 67 68 /* Assume that user mode programs are passing in an ext2fs superblock, not 69 * a kernel struct super_block. This will allow us to call the feature-test 70 * macros from user land. */ 71 #define EXT2_SB(sb) (sb) 72 73 /* 74 * Maximal count of links to a file 75 */ 76 #define EXT2_LINK_MAX 32000 77 78 /* 79 * Macro-instructions used to manage several block sizes 80 */ 81 #define EXT2_MIN_BLOCK_SIZE 1024 82 #define EXT2_MAX_BLOCK_SIZE 4096 83 #define EXT2_MIN_BLOCK_LOG_SIZE 10 84 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 85 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 86 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 87 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 88 EXT2_GOOD_OLD_INODE_SIZE : \ 89 (s)->s_inode_size) 90 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 91 EXT2_GOOD_OLD_FIRST_INO : \ 92 (s)->s_first_ino) 93 94 /* 95 * Macro-instructions used to manage fragments 96 */ 97 #define EXT2_MIN_FRAG_SIZE 1024 98 #define EXT2_MAX_FRAG_SIZE 4096 99 #define EXT2_MIN_FRAG_LOG_SIZE 10 100 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 101 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 102 103 /* 104 * Structure of a blocks group descriptor 105 */ 106 struct ext2_group_desc 107 { 108 __le32 bg_block_bitmap; /* Blocks bitmap block */ 109 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 110 __le32 bg_inode_table; /* Inodes table block */ 111 __le16 bg_free_blocks_count; /* Free blocks count */ 112 __le16 bg_free_inodes_count; /* Free inodes count */ 113 __le16 bg_used_dirs_count; /* Directories count */ 114 __le16 bg_pad; 115 __le32 bg_reserved[3]; 116 }; 117 118 /* 119 * Macro-instructions used to manage group descriptors 120 */ 121 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 122 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 123 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 124 125 /* 126 * Constants relative to the data blocks 127 */ 128 #define EXT2_NDIR_BLOCKS 12 129 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 130 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 131 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 132 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 133 134 /* 135 * Inode flags (GETFLAGS/SETFLAGS) 136 */ 137 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 138 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 139 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 140 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 141 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 142 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 143 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 144 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 145 /* Reserved for compression usage... */ 146 #define EXT2_DIRTY_FL FS_DIRTY_FL 147 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 148 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 149 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 150 /* End compression flags --- maybe not all used */ 151 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 152 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 153 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 154 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 155 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 156 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 157 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 158 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 159 160 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 161 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 162 163 /* 164 * ioctl commands 165 */ 166 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 167 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 168 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 169 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 170 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 171 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 172 173 /* 174 * ioctl commands in 32 bit emulation 175 */ 176 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 177 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 178 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 179 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 180 181 /* 182 * Structure of an inode on the disk 183 */ 184 struct ext2_inode { 185 __le16 i_mode; /* File mode */ 186 __le16 i_uid; /* Low 16 bits of Owner Uid */ 187 __le32 i_size; /* Size in bytes */ 188 __le32 i_atime; /* Access time */ 189 __le32 i_ctime; /* Creation time */ 190 __le32 i_mtime; /* Modification time */ 191 __le32 i_dtime; /* Deletion Time */ 192 __le16 i_gid; /* Low 16 bits of Group Id */ 193 __le16 i_links_count; /* Links count */ 194 __le32 i_blocks; /* Blocks count */ 195 __le32 i_flags; /* File flags */ 196 union { 197 struct { 198 __le32 l_i_reserved1; 199 } linux1; 200 struct { 201 __le32 h_i_translator; 202 } hurd1; 203 struct { 204 __le32 m_i_reserved1; 205 } masix1; 206 } osd1; /* OS dependent 1 */ 207 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 208 __le32 i_generation; /* File version (for NFS) */ 209 __le32 i_file_acl; /* File ACL */ 210 __le32 i_dir_acl; /* Directory ACL */ 211 __le32 i_faddr; /* Fragment address */ 212 union { 213 struct { 214 __u8 l_i_frag; /* Fragment number */ 215 __u8 l_i_fsize; /* Fragment size */ 216 __u16 i_pad1; 217 __le16 l_i_uid_high; /* these 2 fields */ 218 __le16 l_i_gid_high; /* were reserved2[0] */ 219 __u32 l_i_reserved2; 220 } linux2; 221 struct { 222 __u8 h_i_frag; /* Fragment number */ 223 __u8 h_i_fsize; /* Fragment size */ 224 __le16 h_i_mode_high; 225 __le16 h_i_uid_high; 226 __le16 h_i_gid_high; 227 __le32 h_i_author; 228 } hurd2; 229 struct { 230 __u8 m_i_frag; /* Fragment number */ 231 __u8 m_i_fsize; /* Fragment size */ 232 __u16 m_pad1; 233 __u32 m_i_reserved2[2]; 234 } masix2; 235 } osd2; /* OS dependent 2 */ 236 }; 237 238 #define i_size_high i_dir_acl 239 240 #if defined(__KERNEL__) || defined(__linux__) 241 #define i_reserved1 osd1.linux1.l_i_reserved1 242 #define i_frag osd2.linux2.l_i_frag 243 #define i_fsize osd2.linux2.l_i_fsize 244 #define i_uid_low i_uid 245 #define i_gid_low i_gid 246 #define i_uid_high osd2.linux2.l_i_uid_high 247 #define i_gid_high osd2.linux2.l_i_gid_high 248 #define i_reserved2 osd2.linux2.l_i_reserved2 249 #endif 250 251 #ifdef __hurd__ 252 #define i_translator osd1.hurd1.h_i_translator 253 #define i_frag osd2.hurd2.h_i_frag; 254 #define i_fsize osd2.hurd2.h_i_fsize; 255 #define i_uid_high osd2.hurd2.h_i_uid_high 256 #define i_gid_high osd2.hurd2.h_i_gid_high 257 #define i_author osd2.hurd2.h_i_author 258 #endif 259 260 #ifdef __masix__ 261 #define i_reserved1 osd1.masix1.m_i_reserved1 262 #define i_frag osd2.masix2.m_i_frag 263 #define i_fsize osd2.masix2.m_i_fsize 264 #define i_reserved2 osd2.masix2.m_i_reserved2 265 #endif 266 267 /* 268 * File system states 269 */ 270 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 271 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 272 273 /* 274 * Mount flags 275 */ 276 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 277 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 278 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 279 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 280 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 281 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 282 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 283 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 284 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 285 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 286 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 287 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 288 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 289 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 290 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 291 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 292 293 294 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 295 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 296 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 297 EXT2_MOUNT_##opt) 298 /* 299 * Maximal mount counts between two filesystem checks 300 */ 301 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 302 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 303 304 /* 305 * Behaviour when detecting errors 306 */ 307 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 308 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 309 #define EXT2_ERRORS_PANIC 3 /* Panic */ 310 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 311 312 /* 313 * Structure of the super block 314 */ 315 struct ext2_super_block { 316 __le32 s_inodes_count; /* Inodes count */ 317 __le32 s_blocks_count; /* Blocks count */ 318 __le32 s_r_blocks_count; /* Reserved blocks count */ 319 __le32 s_free_blocks_count; /* Free blocks count */ 320 __le32 s_free_inodes_count; /* Free inodes count */ 321 __le32 s_first_data_block; /* First Data Block */ 322 __le32 s_log_block_size; /* Block size */ 323 __le32 s_log_frag_size; /* Fragment size */ 324 __le32 s_blocks_per_group; /* # Blocks per group */ 325 __le32 s_frags_per_group; /* # Fragments per group */ 326 __le32 s_inodes_per_group; /* # Inodes per group */ 327 __le32 s_mtime; /* Mount time */ 328 __le32 s_wtime; /* Write time */ 329 __le16 s_mnt_count; /* Mount count */ 330 __le16 s_max_mnt_count; /* Maximal mount count */ 331 __le16 s_magic; /* Magic signature */ 332 __le16 s_state; /* File system state */ 333 __le16 s_errors; /* Behaviour when detecting errors */ 334 __le16 s_minor_rev_level; /* minor revision level */ 335 __le32 s_lastcheck; /* time of last check */ 336 __le32 s_checkinterval; /* max. time between checks */ 337 __le32 s_creator_os; /* OS */ 338 __le32 s_rev_level; /* Revision level */ 339 __le16 s_def_resuid; /* Default uid for reserved blocks */ 340 __le16 s_def_resgid; /* Default gid for reserved blocks */ 341 /* 342 * These fields are for EXT2_DYNAMIC_REV superblocks only. 343 * 344 * Note: the difference between the compatible feature set and 345 * the incompatible feature set is that if there is a bit set 346 * in the incompatible feature set that the kernel doesn't 347 * know about, it should refuse to mount the filesystem. 348 * 349 * e2fsck's requirements are more strict; if it doesn't know 350 * about a feature in either the compatible or incompatible 351 * feature set, it must abort and not try to meddle with 352 * things it doesn't understand... 353 */ 354 __le32 s_first_ino; /* First non-reserved inode */ 355 __le16 s_inode_size; /* size of inode structure */ 356 __le16 s_block_group_nr; /* block group # of this superblock */ 357 __le32 s_feature_compat; /* compatible feature set */ 358 __le32 s_feature_incompat; /* incompatible feature set */ 359 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 360 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 361 char s_volume_name[16]; /* volume name */ 362 char s_last_mounted[64]; /* directory where last mounted */ 363 __le32 s_algorithm_usage_bitmap; /* For compression */ 364 /* 365 * Performance hints. Directory preallocation should only 366 * happen if the EXT2_COMPAT_PREALLOC flag is on. 367 */ 368 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 369 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 370 __u16 s_padding1; 371 /* 372 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 373 */ 374 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 375 __u32 s_journal_inum; /* inode number of journal file */ 376 __u32 s_journal_dev; /* device number of journal file */ 377 __u32 s_last_orphan; /* start of list of inodes to delete */ 378 __u32 s_hash_seed[4]; /* HTREE hash seed */ 379 __u8 s_def_hash_version; /* Default hash version to use */ 380 __u8 s_reserved_char_pad; 381 __u16 s_reserved_word_pad; 382 __le32 s_default_mount_opts; 383 __le32 s_first_meta_bg; /* First metablock block group */ 384 __u32 s_reserved[190]; /* Padding to the end of the block */ 385 }; 386 387 /* 388 * Codes for operating systems 389 */ 390 #define EXT2_OS_LINUX 0 391 #define EXT2_OS_HURD 1 392 #define EXT2_OS_MASIX 2 393 #define EXT2_OS_FREEBSD 3 394 #define EXT2_OS_LITES 4 395 396 /* 397 * Revision levels 398 */ 399 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 400 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 401 402 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 403 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 404 405 #define EXT2_GOOD_OLD_INODE_SIZE 128 406 407 /* 408 * Feature set definitions 409 */ 410 411 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 412 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 413 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 414 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 415 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 416 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 417 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 418 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 419 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 420 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 421 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 422 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 423 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 424 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 425 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 426 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 427 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 428 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 429 430 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 431 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 432 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 433 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 434 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 435 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 436 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 437 438 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 439 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 440 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 441 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 442 443 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 444 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 445 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 446 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 447 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 448 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 449 450 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 451 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 452 EXT2_FEATURE_INCOMPAT_META_BG) 453 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 454 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 455 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 456 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 457 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 458 459 /* 460 * Default values for user and/or group using reserved blocks 461 */ 462 #define EXT2_DEF_RESUID 0 463 #define EXT2_DEF_RESGID 0 464 465 /* 466 * Default mount options 467 */ 468 #define EXT2_DEFM_DEBUG 0x0001 469 #define EXT2_DEFM_BSDGROUPS 0x0002 470 #define EXT2_DEFM_XATTR_USER 0x0004 471 #define EXT2_DEFM_ACL 0x0008 472 #define EXT2_DEFM_UID16 0x0010 473 /* Not used by ext2, but reserved for use by ext3 */ 474 #define EXT3_DEFM_JMODE 0x0060 475 #define EXT3_DEFM_JMODE_DATA 0x0020 476 #define EXT3_DEFM_JMODE_ORDERED 0x0040 477 #define EXT3_DEFM_JMODE_WBACK 0x0060 478 479 /* 480 * Structure of a directory entry 481 */ 482 #define EXT2_NAME_LEN 255 483 484 struct ext2_dir_entry { 485 __le32 inode; /* Inode number */ 486 __le16 rec_len; /* Directory entry length */ 487 __le16 name_len; /* Name length */ 488 char name[EXT2_NAME_LEN]; /* File name */ 489 }; 490 491 /* 492 * The new version of the directory entry. Since EXT2 structures are 493 * stored in intel byte order, and the name_len field could never be 494 * bigger than 255 chars, it's safe to reclaim the extra byte for the 495 * file_type field. 496 */ 497 struct ext2_dir_entry_2 { 498 __le32 inode; /* Inode number */ 499 __le16 rec_len; /* Directory entry length */ 500 __u8 name_len; /* Name length */ 501 __u8 file_type; 502 char name[EXT2_NAME_LEN]; /* File name */ 503 }; 504 505 /* 506 * Ext2 directory file types. Only the low 3 bits are used. The 507 * other bits are reserved for now. 508 */ 509 enum { 510 EXT2_FT_UNKNOWN, 511 EXT2_FT_REG_FILE, 512 EXT2_FT_DIR, 513 EXT2_FT_CHRDEV, 514 EXT2_FT_BLKDEV, 515 EXT2_FT_FIFO, 516 EXT2_FT_SOCK, 517 EXT2_FT_SYMLINK, 518 EXT2_FT_MAX 519 }; 520 521 /* 522 * EXT2_DIR_PAD defines the directory entries boundaries 523 * 524 * NOTE: It must be a multiple of 4 525 */ 526 #define EXT2_DIR_PAD 4 527 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 528 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 529 ~EXT2_DIR_ROUND) 530 #define EXT2_MAX_REC_LEN ((1<<16)-1) 531 532 #endif /* _LINUX_EXT2_FS_H */ 533