1 /* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card (at) 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 #include <linux/fs.h> 22 23 /* 24 * The second extended filesystem constants/structures 25 */ 26 27 /* 28 * Define EXT2FS_DEBUG to produce debug messages 29 */ 30 #undef EXT2FS_DEBUG 31 32 /* 33 * Define EXT2_RESERVATION to reserve data blocks for expanding files 34 */ 35 #define EXT2_DEFAULT_RESERVE_BLOCKS 8 36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */ 37 #define EXT2_MAX_RESERVE_BLOCKS 1027 38 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0 39 /* 40 * The second extended file system version 41 */ 42 #define EXT2FS_DATE "95/08/09" 43 #define EXT2FS_VERSION "0.5b" 44 45 /* 46 * Debug code 47 */ 48 #ifdef EXT2FS_DEBUG 49 # define ext2_debug(f, a...) { \ 50 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 51 __FILE__, __LINE__, __func__); \ 52 printk (f, ## a); \ 53 } 54 #else 55 # define ext2_debug(f, a...) /**/ 56 #endif 57 58 /* 59 * Special inode numbers 60 */ 61 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 62 #define EXT2_ROOT_INO 2 /* Root inode */ 63 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 64 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 65 66 /* First non-reserved inode for old ext2 filesystems */ 67 #define EXT2_GOOD_OLD_FIRST_INO 11 68 69 /* Assume that user mode programs are passing in an ext2fs superblock, not 70 * a kernel struct super_block. This will allow us to call the feature-test 71 * macros from user land. */ 72 #define EXT2_SB(sb) (sb) 73 74 /* 75 * Maximal count of links to a file 76 */ 77 #define EXT2_LINK_MAX 32000 78 79 /* 80 * Macro-instructions used to manage several block sizes 81 */ 82 #define EXT2_MIN_BLOCK_SIZE 1024 83 #define EXT2_MAX_BLOCK_SIZE 4096 84 #define EXT2_MIN_BLOCK_LOG_SIZE 10 85 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 86 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 87 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 88 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 89 EXT2_GOOD_OLD_INODE_SIZE : \ 90 (s)->s_inode_size) 91 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 92 EXT2_GOOD_OLD_FIRST_INO : \ 93 (s)->s_first_ino) 94 95 /* 96 * Macro-instructions used to manage fragments 97 */ 98 #define EXT2_MIN_FRAG_SIZE 1024 99 #define EXT2_MAX_FRAG_SIZE 4096 100 #define EXT2_MIN_FRAG_LOG_SIZE 10 101 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 102 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 103 104 /* 105 * Structure of a blocks group descriptor 106 */ 107 struct ext2_group_desc 108 { 109 __le32 bg_block_bitmap; /* Blocks bitmap block */ 110 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 111 __le32 bg_inode_table; /* Inodes table block */ 112 __le16 bg_free_blocks_count; /* Free blocks count */ 113 __le16 bg_free_inodes_count; /* Free inodes count */ 114 __le16 bg_used_dirs_count; /* Directories count */ 115 __le16 bg_pad; 116 __le32 bg_reserved[3]; 117 }; 118 119 /* 120 * Macro-instructions used to manage group descriptors 121 */ 122 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 123 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 124 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 125 126 /* 127 * Constants relative to the data blocks 128 */ 129 #define EXT2_NDIR_BLOCKS 12 130 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 131 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 132 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 133 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 134 135 /* 136 * Inode flags (GETFLAGS/SETFLAGS) 137 */ 138 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 139 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 140 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 141 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 142 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 143 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 144 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 145 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 146 /* Reserved for compression usage... */ 147 #define EXT2_DIRTY_FL FS_DIRTY_FL 148 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 149 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 150 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 151 /* End compression flags --- maybe not all used */ 152 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 153 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 154 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 155 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 156 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 157 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 158 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 159 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 160 161 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 162 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 163 164 /* Flags that should be inherited by new inodes from their parent. */ 165 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 166 EXT2_SYNC_FL | EXT2_NODUMP_FL |\ 167 EXT2_NOATIME_FL | EXT2_COMPRBLK_FL |\ 168 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 169 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 170 171 /* Flags that are appropriate for regular files (all but dir-specific ones). */ 172 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 173 174 /* Flags that are appropriate for non-directories/regular files. */ 175 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 176 177 /* Mask out flags that are inappropriate for the given type of inode. */ 178 static __inline__ __u32 ext2_mask_flags(umode_t mode, __u32 flags) 179 { 180 if (S_ISDIR(mode)) 181 return flags; 182 else if (S_ISREG(mode)) 183 return flags & EXT2_REG_FLMASK; 184 else 185 return flags & EXT2_OTHER_FLMASK; 186 } 187 188 /* 189 * ioctl commands 190 */ 191 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 192 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 193 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 194 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 195 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 196 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 197 198 /* 199 * ioctl commands in 32 bit emulation 200 */ 201 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 202 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 203 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 204 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 205 206 /* 207 * Structure of an inode on the disk 208 */ 209 struct ext2_inode { 210 __le16 i_mode; /* File mode */ 211 __le16 i_uid; /* Low 16 bits of Owner Uid */ 212 __le32 i_size; /* Size in bytes */ 213 __le32 i_atime; /* Access time */ 214 __le32 i_ctime; /* Creation time */ 215 __le32 i_mtime; /* Modification time */ 216 __le32 i_dtime; /* Deletion Time */ 217 __le16 i_gid; /* Low 16 bits of Group Id */ 218 __le16 i_links_count; /* Links count */ 219 __le32 i_blocks; /* Blocks count */ 220 __le32 i_flags; /* File flags */ 221 union { 222 struct { 223 __le32 l_i_reserved1; 224 } linux1; 225 struct { 226 __le32 h_i_translator; 227 } hurd1; 228 struct { 229 __le32 m_i_reserved1; 230 } masix1; 231 } osd1; /* OS dependent 1 */ 232 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 233 __le32 i_generation; /* File version (for NFS) */ 234 __le32 i_file_acl; /* File ACL */ 235 __le32 i_dir_acl; /* Directory ACL */ 236 __le32 i_faddr; /* Fragment address */ 237 union { 238 struct { 239 __u8 l_i_frag; /* Fragment number */ 240 __u8 l_i_fsize; /* Fragment size */ 241 __u16 i_pad1; 242 __le16 l_i_uid_high; /* these 2 fields */ 243 __le16 l_i_gid_high; /* were reserved2[0] */ 244 __u32 l_i_reserved2; 245 } linux2; 246 struct { 247 __u8 h_i_frag; /* Fragment number */ 248 __u8 h_i_fsize; /* Fragment size */ 249 __le16 h_i_mode_high; 250 __le16 h_i_uid_high; 251 __le16 h_i_gid_high; 252 __le32 h_i_author; 253 } hurd2; 254 struct { 255 __u8 m_i_frag; /* Fragment number */ 256 __u8 m_i_fsize; /* Fragment size */ 257 __u16 m_pad1; 258 __u32 m_i_reserved2[2]; 259 } masix2; 260 } osd2; /* OS dependent 2 */ 261 }; 262 263 #define i_size_high i_dir_acl 264 265 #if defined(__KERNEL__) || defined(__linux__) 266 #define i_reserved1 osd1.linux1.l_i_reserved1 267 #define i_frag osd2.linux2.l_i_frag 268 #define i_fsize osd2.linux2.l_i_fsize 269 #define i_uid_low i_uid 270 #define i_gid_low i_gid 271 #define i_uid_high osd2.linux2.l_i_uid_high 272 #define i_gid_high osd2.linux2.l_i_gid_high 273 #define i_reserved2 osd2.linux2.l_i_reserved2 274 #endif 275 276 #ifdef __hurd__ 277 #define i_translator osd1.hurd1.h_i_translator 278 #define i_frag osd2.hurd2.h_i_frag 279 #define i_fsize osd2.hurd2.h_i_fsize 280 #define i_uid_high osd2.hurd2.h_i_uid_high 281 #define i_gid_high osd2.hurd2.h_i_gid_high 282 #define i_author osd2.hurd2.h_i_author 283 #endif 284 285 #ifdef __masix__ 286 #define i_reserved1 osd1.masix1.m_i_reserved1 287 #define i_frag osd2.masix2.m_i_frag 288 #define i_fsize osd2.masix2.m_i_fsize 289 #define i_reserved2 osd2.masix2.m_i_reserved2 290 #endif 291 292 /* 293 * File system states 294 */ 295 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 296 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 297 298 /* 299 * Mount flags 300 */ 301 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 302 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 303 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 304 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 305 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 306 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 307 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 308 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 309 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 310 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 311 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 312 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 313 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 314 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 315 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 316 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 317 318 319 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 320 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 321 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 322 EXT2_MOUNT_##opt) 323 /* 324 * Maximal mount counts between two filesystem checks 325 */ 326 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 327 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 328 329 /* 330 * Behaviour when detecting errors 331 */ 332 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 333 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 334 #define EXT2_ERRORS_PANIC 3 /* Panic */ 335 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 336 337 /* 338 * Structure of the super block 339 */ 340 struct ext2_super_block { 341 __le32 s_inodes_count; /* Inodes count */ 342 __le32 s_blocks_count; /* Blocks count */ 343 __le32 s_r_blocks_count; /* Reserved blocks count */ 344 __le32 s_free_blocks_count; /* Free blocks count */ 345 __le32 s_free_inodes_count; /* Free inodes count */ 346 __le32 s_first_data_block; /* First Data Block */ 347 __le32 s_log_block_size; /* Block size */ 348 __le32 s_log_frag_size; /* Fragment size */ 349 __le32 s_blocks_per_group; /* # Blocks per group */ 350 __le32 s_frags_per_group; /* # Fragments per group */ 351 __le32 s_inodes_per_group; /* # Inodes per group */ 352 __le32 s_mtime; /* Mount time */ 353 __le32 s_wtime; /* Write time */ 354 __le16 s_mnt_count; /* Mount count */ 355 __le16 s_max_mnt_count; /* Maximal mount count */ 356 __le16 s_magic; /* Magic signature */ 357 __le16 s_state; /* File system state */ 358 __le16 s_errors; /* Behaviour when detecting errors */ 359 __le16 s_minor_rev_level; /* minor revision level */ 360 __le32 s_lastcheck; /* time of last check */ 361 __le32 s_checkinterval; /* max. time between checks */ 362 __le32 s_creator_os; /* OS */ 363 __le32 s_rev_level; /* Revision level */ 364 __le16 s_def_resuid; /* Default uid for reserved blocks */ 365 __le16 s_def_resgid; /* Default gid for reserved blocks */ 366 /* 367 * These fields are for EXT2_DYNAMIC_REV superblocks only. 368 * 369 * Note: the difference between the compatible feature set and 370 * the incompatible feature set is that if there is a bit set 371 * in the incompatible feature set that the kernel doesn't 372 * know about, it should refuse to mount the filesystem. 373 * 374 * e2fsck's requirements are more strict; if it doesn't know 375 * about a feature in either the compatible or incompatible 376 * feature set, it must abort and not try to meddle with 377 * things it doesn't understand... 378 */ 379 __le32 s_first_ino; /* First non-reserved inode */ 380 __le16 s_inode_size; /* size of inode structure */ 381 __le16 s_block_group_nr; /* block group # of this superblock */ 382 __le32 s_feature_compat; /* compatible feature set */ 383 __le32 s_feature_incompat; /* incompatible feature set */ 384 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 385 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 386 char s_volume_name[16]; /* volume name */ 387 char s_last_mounted[64]; /* directory where last mounted */ 388 __le32 s_algorithm_usage_bitmap; /* For compression */ 389 /* 390 * Performance hints. Directory preallocation should only 391 * happen if the EXT2_COMPAT_PREALLOC flag is on. 392 */ 393 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 394 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 395 __u16 s_padding1; 396 /* 397 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 398 */ 399 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 400 __u32 s_journal_inum; /* inode number of journal file */ 401 __u32 s_journal_dev; /* device number of journal file */ 402 __u32 s_last_orphan; /* start of list of inodes to delete */ 403 __u32 s_hash_seed[4]; /* HTREE hash seed */ 404 __u8 s_def_hash_version; /* Default hash version to use */ 405 __u8 s_reserved_char_pad; 406 __u16 s_reserved_word_pad; 407 __le32 s_default_mount_opts; 408 __le32 s_first_meta_bg; /* First metablock block group */ 409 __u32 s_reserved[190]; /* Padding to the end of the block */ 410 }; 411 412 /* 413 * Codes for operating systems 414 */ 415 #define EXT2_OS_LINUX 0 416 #define EXT2_OS_HURD 1 417 #define EXT2_OS_MASIX 2 418 #define EXT2_OS_FREEBSD 3 419 #define EXT2_OS_LITES 4 420 421 /* 422 * Revision levels 423 */ 424 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 425 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 426 427 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 428 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 429 430 #define EXT2_GOOD_OLD_INODE_SIZE 128 431 432 /* 433 * Feature set definitions 434 */ 435 436 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 437 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 438 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 439 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 440 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 441 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 442 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 443 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 444 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 445 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 446 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 447 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 448 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 449 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 450 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 451 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 452 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 453 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 454 455 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 456 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 457 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 458 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 459 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 460 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 461 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 462 463 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 464 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 465 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 466 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 467 468 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 469 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 470 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 471 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 472 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 473 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 474 475 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 476 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 477 EXT2_FEATURE_INCOMPAT_META_BG) 478 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 479 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 480 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 481 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 482 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 483 484 /* 485 * Default values for user and/or group using reserved blocks 486 */ 487 #define EXT2_DEF_RESUID 0 488 #define EXT2_DEF_RESGID 0 489 490 /* 491 * Default mount options 492 */ 493 #define EXT2_DEFM_DEBUG 0x0001 494 #define EXT2_DEFM_BSDGROUPS 0x0002 495 #define EXT2_DEFM_XATTR_USER 0x0004 496 #define EXT2_DEFM_ACL 0x0008 497 #define EXT2_DEFM_UID16 0x0010 498 /* Not used by ext2, but reserved for use by ext3 */ 499 #define EXT3_DEFM_JMODE 0x0060 500 #define EXT3_DEFM_JMODE_DATA 0x0020 501 #define EXT3_DEFM_JMODE_ORDERED 0x0040 502 #define EXT3_DEFM_JMODE_WBACK 0x0060 503 504 /* 505 * Structure of a directory entry 506 */ 507 #define EXT2_NAME_LEN 255 508 509 struct ext2_dir_entry { 510 __le32 inode; /* Inode number */ 511 __le16 rec_len; /* Directory entry length */ 512 __le16 name_len; /* Name length */ 513 char name[EXT2_NAME_LEN]; /* File name */ 514 }; 515 516 /* 517 * The new version of the directory entry. Since EXT2 structures are 518 * stored in intel byte order, and the name_len field could never be 519 * bigger than 255 chars, it's safe to reclaim the extra byte for the 520 * file_type field. 521 */ 522 struct ext2_dir_entry_2 { 523 __le32 inode; /* Inode number */ 524 __le16 rec_len; /* Directory entry length */ 525 __u8 name_len; /* Name length */ 526 __u8 file_type; 527 char name[EXT2_NAME_LEN]; /* File name */ 528 }; 529 530 /* 531 * Ext2 directory file types. Only the low 3 bits are used. The 532 * other bits are reserved for now. 533 */ 534 enum { 535 EXT2_FT_UNKNOWN = 0, 536 EXT2_FT_REG_FILE = 1, 537 EXT2_FT_DIR = 2, 538 EXT2_FT_CHRDEV = 3, 539 EXT2_FT_BLKDEV = 4, 540 EXT2_FT_FIFO = 5, 541 EXT2_FT_SOCK = 6, 542 EXT2_FT_SYMLINK = 7, 543 EXT2_FT_MAX 544 }; 545 546 /* 547 * EXT2_DIR_PAD defines the directory entries boundaries 548 * 549 * NOTE: It must be a multiple of 4 550 */ 551 #define EXT2_DIR_PAD 4 552 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 553 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 554 ~EXT2_DIR_ROUND) 555 #define EXT2_MAX_REC_LEN ((1<<16)-1) 556 557 #endif /* _LINUX_EXT2_FS_H */ 558
