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 21 /* 22 * The second extended filesystem constants/structures 23 */ 24 25 /* 26 * Define EXT2FS_DEBUG to produce debug messages 27 */ 28 #undef EXT2FS_DEBUG 29 30 /* 31 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files 32 */ 33 #define EXT2_PREALLOCATE 34 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 35 36 /* 37 * The second extended file system version 38 */ 39 #define EXT2FS_DATE "95/08/09" 40 #define EXT2FS_VERSION "0.5b" 41 42 /* 43 * Debug code 44 */ 45 #ifdef EXT2FS_DEBUG 46 # define ext2_debug(f, a...) { \ 47 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 48 __FILE__, __LINE__, __FUNCTION__); \ 49 printk (f, ## a); \ 50 } 51 #else 52 # define ext2_debug(f, a...) /**/ 53 #endif 54 55 /* 56 * Special inode numbers 57 */ 58 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 59 #define EXT2_ROOT_INO 2 /* Root inode */ 60 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 61 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 62 63 /* First non-reserved inode for old ext2 filesystems */ 64 #define EXT2_GOOD_OLD_FIRST_INO 11 65 66 /* 67 * The second extended file system magic number 68 */ 69 #define EXT2_SUPER_MAGIC 0xEF53 70 71 #ifdef __KERNEL__ 72 #include <linux/ext2_fs_sb.h> 73 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 74 { 75 return sb->s_fs_info; 76 } 77 #else 78 /* Assume that user mode programs are passing in an ext2fs superblock, not 79 * a kernel struct super_block. This will allow us to call the feature-test 80 * macros from user land. */ 81 #define EXT2_SB(sb) (sb) 82 #endif 83 84 /* 85 * Maximal count of links to a file 86 */ 87 #define EXT2_LINK_MAX 32000 88 89 /* 90 * Macro-instructions used to manage several block sizes 91 */ 92 #define EXT2_MIN_BLOCK_SIZE 1024 93 #define EXT2_MAX_BLOCK_SIZE 4096 94 #define EXT2_MIN_BLOCK_LOG_SIZE 10 95 #ifdef __KERNEL__ 96 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 97 #else 98 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 99 #endif 100 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 101 #ifdef __KERNEL__ 102 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 103 #else 104 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 105 #endif 106 #ifdef __KERNEL__ 107 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 108 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 109 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 110 #else 111 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 112 EXT2_GOOD_OLD_INODE_SIZE : \ 113 (s)->s_inode_size) 114 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 115 EXT2_GOOD_OLD_FIRST_INO : \ 116 (s)->s_first_ino) 117 #endif 118 119 /* 120 * Macro-instructions used to manage fragments 121 */ 122 #define EXT2_MIN_FRAG_SIZE 1024 123 #define EXT2_MAX_FRAG_SIZE 4096 124 #define EXT2_MIN_FRAG_LOG_SIZE 10 125 #ifdef __KERNEL__ 126 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 127 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 128 #else 129 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 130 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 131 #endif 132 133 /* 134 * Structure of a blocks group descriptor 135 */ 136 struct ext2_group_desc 137 { 138 __le32 bg_block_bitmap; /* Blocks bitmap block */ 139 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 140 __le32 bg_inode_table; /* Inodes table block */ 141 __le16 bg_free_blocks_count; /* Free blocks count */ 142 __le16 bg_free_inodes_count; /* Free inodes count */ 143 __le16 bg_used_dirs_count; /* Directories count */ 144 __le16 bg_pad; 145 __le32 bg_reserved[3]; 146 }; 147 148 /* 149 * Macro-instructions used to manage group descriptors 150 */ 151 #ifdef __KERNEL__ 152 # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 153 # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 154 # define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 155 # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 156 #else 157 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 158 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 159 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 160 #endif 161 162 /* 163 * Constants relative to the data blocks 164 */ 165 #define EXT2_NDIR_BLOCKS 12 166 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 167 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 168 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 169 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 170 171 /* 172 * Inode flags 173 */ 174 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 175 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 176 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 177 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 178 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 179 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 180 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 181 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 182 /* Reserved for compression usage... */ 183 #define EXT2_DIRTY_FL 0x00000100 184 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 185 #define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */ 186 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 187 /* End compression flags --- maybe not all used */ 188 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 189 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 190 #define EXT2_IMAGIC_FL 0x00002000 /* AFS directory */ 191 #define EXT2_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 192 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 193 #define EXT2_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 194 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 195 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 196 197 #define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 198 #define EXT2_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 199 200 /* 201 * ioctl commands 202 */ 203 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 204 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 205 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 206 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 207 208 /* 209 * Structure of an inode on the disk 210 */ 211 struct ext2_inode { 212 __le16 i_mode; /* File mode */ 213 __le16 i_uid; /* Low 16 bits of Owner Uid */ 214 __le32 i_size; /* Size in bytes */ 215 __le32 i_atime; /* Access time */ 216 __le32 i_ctime; /* Creation time */ 217 __le32 i_mtime; /* Modification time */ 218 __le32 i_dtime; /* Deletion Time */ 219 __le16 i_gid; /* Low 16 bits of Group Id */ 220 __le16 i_links_count; /* Links count */ 221 __le32 i_blocks; /* Blocks count */ 222 __le32 i_flags; /* File flags */ 223 union { 224 struct { 225 __le32 l_i_reserved1; 226 } linux1; 227 struct { 228 __le32 h_i_translator; 229 } hurd1; 230 struct { 231 __le32 m_i_reserved1; 232 } masix1; 233 } osd1; /* OS dependent 1 */ 234 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 235 __le32 i_generation; /* File version (for NFS) */ 236 __le32 i_file_acl; /* File ACL */ 237 __le32 i_dir_acl; /* Directory ACL */ 238 __le32 i_faddr; /* Fragment address */ 239 union { 240 struct { 241 __u8 l_i_frag; /* Fragment number */ 242 __u8 l_i_fsize; /* Fragment size */ 243 __u16 i_pad1; 244 __le16 l_i_uid_high; /* these 2 fields */ 245 __le16 l_i_gid_high; /* were reserved2[0] */ 246 __u32 l_i_reserved2; 247 } linux2; 248 struct { 249 __u8 h_i_frag; /* Fragment number */ 250 __u8 h_i_fsize; /* Fragment size */ 251 __le16 h_i_mode_high; 252 __le16 h_i_uid_high; 253 __le16 h_i_gid_high; 254 __le32 h_i_author; 255 } hurd2; 256 struct { 257 __u8 m_i_frag; /* Fragment number */ 258 __u8 m_i_fsize; /* Fragment size */ 259 __u16 m_pad1; 260 __u32 m_i_reserved2[2]; 261 } masix2; 262 } osd2; /* OS dependent 2 */ 263 }; 264 265 #define i_size_high i_dir_acl 266 267 #if defined(__KERNEL__) || defined(__linux__) 268 #define i_reserved1 osd1.linux1.l_i_reserved1 269 #define i_frag osd2.linux2.l_i_frag 270 #define i_fsize osd2.linux2.l_i_fsize 271 #define i_uid_low i_uid 272 #define i_gid_low i_gid 273 #define i_uid_high osd2.linux2.l_i_uid_high 274 #define i_gid_high osd2.linux2.l_i_gid_high 275 #define i_reserved2 osd2.linux2.l_i_reserved2 276 #endif 277 278 #ifdef __hurd__ 279 #define i_translator osd1.hurd1.h_i_translator 280 #define i_frag osd2.hurd2.h_i_frag; 281 #define i_fsize osd2.hurd2.h_i_fsize; 282 #define i_uid_high osd2.hurd2.h_i_uid_high 283 #define i_gid_high osd2.hurd2.h_i_gid_high 284 #define i_author osd2.hurd2.h_i_author 285 #endif 286 287 #ifdef __masix__ 288 #define i_reserved1 osd1.masix1.m_i_reserved1 289 #define i_frag osd2.masix2.m_i_frag 290 #define i_fsize osd2.masix2.m_i_fsize 291 #define i_reserved2 osd2.masix2.m_i_reserved2 292 #endif 293 294 /* 295 * File system states 296 */ 297 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 298 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 299 300 /* 301 * Mount flags 302 */ 303 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 304 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 305 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 306 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 307 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 308 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 309 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 310 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 311 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 312 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 313 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 314 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 315 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 316 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 317 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 318 319 320 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 321 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 322 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 323 EXT2_MOUNT_##opt) 324 /* 325 * Maximal mount counts between two filesystem checks 326 */ 327 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 328 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 329 330 /* 331 * Behaviour when detecting errors 332 */ 333 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 334 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 335 #define EXT2_ERRORS_PANIC 3 /* Panic */ 336 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 337 338 /* 339 * Structure of the super block 340 */ 341 struct ext2_super_block { 342 __le32 s_inodes_count; /* Inodes count */ 343 __le32 s_blocks_count; /* Blocks count */ 344 __le32 s_r_blocks_count; /* Reserved blocks count */ 345 __le32 s_free_blocks_count; /* Free blocks count */ 346 __le32 s_free_inodes_count; /* Free inodes count */ 347 __le32 s_first_data_block; /* First Data Block */ 348 __le32 s_log_block_size; /* Block size */ 349 __le32 s_log_frag_size; /* Fragment size */ 350 __le32 s_blocks_per_group; /* # Blocks per group */ 351 __le32 s_frags_per_group; /* # Fragments per group */ 352 __le32 s_inodes_per_group; /* # Inodes per group */ 353 __le32 s_mtime; /* Mount time */ 354 __le32 s_wtime; /* Write time */ 355 __le16 s_mnt_count; /* Mount count */ 356 __le16 s_max_mnt_count; /* Maximal mount count */ 357 __le16 s_magic; /* Magic signature */ 358 __le16 s_state; /* File system state */ 359 __le16 s_errors; /* Behaviour when detecting errors */ 360 __le16 s_minor_rev_level; /* minor revision level */ 361 __le32 s_lastcheck; /* time of last check */ 362 __le32 s_checkinterval; /* max. time between checks */ 363 __le32 s_creator_os; /* OS */ 364 __le32 s_rev_level; /* Revision level */ 365 __le16 s_def_resuid; /* Default uid for reserved blocks */ 366 __le16 s_def_resgid; /* Default gid for reserved blocks */ 367 /* 368 * These fields are for EXT2_DYNAMIC_REV superblocks only. 369 * 370 * Note: the difference between the compatible feature set and 371 * the incompatible feature set is that if there is a bit set 372 * in the incompatible feature set that the kernel doesn't 373 * know about, it should refuse to mount the filesystem. 374 * 375 * e2fsck's requirements are more strict; if it doesn't know 376 * about a feature in either the compatible or incompatible 377 * feature set, it must abort and not try to meddle with 378 * things it doesn't understand... 379 */ 380 __le32 s_first_ino; /* First non-reserved inode */ 381 __le16 s_inode_size; /* size of inode structure */ 382 __le16 s_block_group_nr; /* block group # of this superblock */ 383 __le32 s_feature_compat; /* compatible feature set */ 384 __le32 s_feature_incompat; /* incompatible feature set */ 385 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 386 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 387 char s_volume_name[16]; /* volume name */ 388 char s_last_mounted[64]; /* directory where last mounted */ 389 __le32 s_algorithm_usage_bitmap; /* For compression */ 390 /* 391 * Performance hints. Directory preallocation should only 392 * happen if the EXT2_COMPAT_PREALLOC flag is on. 393 */ 394 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 395 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 396 __u16 s_padding1; 397 /* 398 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 399 */ 400 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 401 __u32 s_journal_inum; /* inode number of journal file */ 402 __u32 s_journal_dev; /* device number of journal file */ 403 __u32 s_last_orphan; /* start of list of inodes to delete */ 404 __u32 s_hash_seed[4]; /* HTREE hash seed */ 405 __u8 s_def_hash_version; /* Default hash version to use */ 406 __u8 s_reserved_char_pad; 407 __u16 s_reserved_word_pad; 408 __le32 s_default_mount_opts; 409 __le32 s_first_meta_bg; /* First metablock block group */ 410 __u32 s_reserved[190]; /* Padding to the end of the block */ 411 }; 412 413 /* 414 * Codes for operating systems 415 */ 416 #define EXT2_OS_LINUX 0 417 #define EXT2_OS_HURD 1 418 #define EXT2_OS_MASIX 2 419 #define EXT2_OS_FREEBSD 3 420 #define EXT2_OS_LITES 4 421 422 /* 423 * Revision levels 424 */ 425 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 426 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 427 428 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 429 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 430 431 #define EXT2_GOOD_OLD_INODE_SIZE 128 432 433 /* 434 * Feature set definitions 435 */ 436 437 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 438 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 439 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 440 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 441 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 442 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 443 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 444 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 445 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 446 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 447 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 448 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 449 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 450 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 451 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 452 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 453 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 454 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 455 456 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 457 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 458 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 459 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 460 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 461 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 462 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 463 464 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 465 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 466 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 467 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 468 469 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 470 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 471 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 472 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 473 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 474 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 475 476 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 477 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 478 EXT2_FEATURE_INCOMPAT_META_BG) 479 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 480 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 481 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 482 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 483 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 484 485 /* 486 * Default values for user and/or group using reserved blocks 487 */ 488 #define EXT2_DEF_RESUID 0 489 #define EXT2_DEF_RESGID 0 490 491 /* 492 * Default mount options 493 */ 494 #define EXT2_DEFM_DEBUG 0x0001 495 #define EXT2_DEFM_BSDGROUPS 0x0002 496 #define EXT2_DEFM_XATTR_USER 0x0004 497 #define EXT2_DEFM_ACL 0x0008 498 #define EXT2_DEFM_UID16 0x0010 499 /* Not used by ext2, but reserved for use by ext3 */ 500 #define EXT3_DEFM_JMODE 0x0060 501 #define EXT3_DEFM_JMODE_DATA 0x0020 502 #define EXT3_DEFM_JMODE_ORDERED 0x0040 503 #define EXT3_DEFM_JMODE_WBACK 0x0060 504 505 /* 506 * Structure of a directory entry 507 */ 508 #define EXT2_NAME_LEN 255 509 510 struct ext2_dir_entry { 511 __le32 inode; /* Inode number */ 512 __le16 rec_len; /* Directory entry length */ 513 __le16 name_len; /* Name length */ 514 char name[EXT2_NAME_LEN]; /* File name */ 515 }; 516 517 /* 518 * The new version of the directory entry. Since EXT2 structures are 519 * stored in intel byte order, and the name_len field could never be 520 * bigger than 255 chars, it's safe to reclaim the extra byte for the 521 * file_type field. 522 */ 523 struct ext2_dir_entry_2 { 524 __le32 inode; /* Inode number */ 525 __le16 rec_len; /* Directory entry length */ 526 __u8 name_len; /* Name length */ 527 __u8 file_type; 528 char name[EXT2_NAME_LEN]; /* File name */ 529 }; 530 531 /* 532 * Ext2 directory file types. Only the low 3 bits are used. The 533 * other bits are reserved for now. 534 */ 535 enum { 536 EXT2_FT_UNKNOWN, 537 EXT2_FT_REG_FILE, 538 EXT2_FT_DIR, 539 EXT2_FT_CHRDEV, 540 EXT2_FT_BLKDEV, 541 EXT2_FT_FIFO, 542 EXT2_FT_SOCK, 543 EXT2_FT_SYMLINK, 544 EXT2_FT_MAX 545 }; 546 547 /* 548 * EXT2_DIR_PAD defines the directory entries boundaries 549 * 550 * NOTE: It must be a multiple of 4 551 */ 552 #define EXT2_DIR_PAD 4 553 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 554 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 555 ~EXT2_DIR_ROUND) 556 557 #endif /* _LINUX_EXT2_FS_H */ 558
