1 /* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card ([email protected]) 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_PREALLOCATE to preallocate data blocks for expanding files 33 */ 34 #define EXT2_PREALLOCATE 35 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8 36 37 /* 38 * The second extended file system version 39 */ 40 #define EXT2FS_DATE "95/08/09" 41 #define EXT2FS_VERSION "0.5b" 42 43 /* 44 * Debug code 45 */ 46 #ifdef EXT2FS_DEBUG 47 # define ext2_debug(f, a...) { \ 48 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 49 __FILE__, __LINE__, __FUNCTION__); \ 50 printk (f, ## a); \ 51 } 52 #else 53 # define ext2_debug(f, a...) /**/ 54 #endif 55 56 /* 57 * Special inode numbers 58 */ 59 #define EXT2_BAD_INO 1 /* Bad blocks inode */ 60 #define EXT2_ROOT_INO 2 /* Root inode */ 61 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 62 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 63 64 /* First non-reserved inode for old ext2 filesystems */ 65 #define EXT2_GOOD_OLD_FIRST_INO 11 66 67 #ifdef __KERNEL__ 68 #include <linux/ext2_fs_sb.h> 69 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 70 { 71 return sb->s_fs_info; 72 } 73 #else 74 /* Assume that user mode programs are passing in an ext2fs superblock, not 75 * a kernel struct super_block. This will allow us to call the feature-test 76 * macros from user land. */ 77 #define EXT2_SB(sb) (sb) 78 #endif 79 80 /* 81 * Maximal count of links to a file 82 */ 83 #define EXT2_LINK_MAX 32000 84 85 /* 86 * Macro-instructions used to manage several block sizes 87 */ 88 #define EXT2_MIN_BLOCK_SIZE 1024 89 #define EXT2_MAX_BLOCK_SIZE 4096 90 #define EXT2_MIN_BLOCK_LOG_SIZE 10 91 #ifdef __KERNEL__ 92 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 93 #else 94 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 95 #endif 96 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 97 #ifdef __KERNEL__ 98 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 99 #else 100 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 101 #endif 102 #ifdef __KERNEL__ 103 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 104 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 105 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 106 #else 107 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 108 EXT2_GOOD_OLD_INODE_SIZE : \ 109 (s)->s_inode_size) 110 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 111 EXT2_GOOD_OLD_FIRST_INO : \ 112 (s)->s_first_ino) 113 #endif 114 115 /* 116 * Macro-instructions used to manage fragments 117 */ 118 #define EXT2_MIN_FRAG_SIZE 1024 119 #define EXT2_MAX_FRAG_SIZE 4096 120 #define EXT2_MIN_FRAG_LOG_SIZE 10 121 #ifdef __KERNEL__ 122 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 123 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 124 #else 125 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 126 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 127 #endif 128 129 /* 130 * Structure of a blocks group descriptor 131 */ 132 struct ext2_group_desc 133 { 134 __le32 bg_block_bitmap; /* Blocks bitmap block */ 135 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 136 __le32 bg_inode_table; /* Inodes table block */ 137 __le16 bg_free_blocks_count; /* Free blocks count */ 138 __le16 bg_free_inodes_count; /* Free inodes count */ 139 __le16 bg_used_dirs_count; /* Directories count */ 140 __le16 bg_pad; 141 __le32 bg_reserved[3]; 142 }; 143 144 /* 145 * Macro-instructions used to manage group descriptors 146 */ 147 #ifdef __KERNEL__ 148 # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 149 # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 150 # define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 151 # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 152 #else 153 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 154 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 155 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 156 #endif 157 158 /* 159 * Constants relative to the data blocks 160 */ 161 #define EXT2_NDIR_BLOCKS 12 162 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 163 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 164 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 165 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 166 167 /* 168 * Inode flags 169 */ 170 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 171 #define EXT2_UNRM_FL 0x00000002 /* Undelete */ 172 #define EXT2_COMPR_FL 0x00000004 /* Compress file */ 173 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 174 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 175 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 176 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 177 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 178 /* Reserved for compression usage... */ 179 #define EXT2_DIRTY_FL 0x00000100 180 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 181 #define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */ 182 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 183 /* End compression flags --- maybe not all used */ 184 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 185 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 186 #define EXT2_IMAGIC_FL 0x00002000 /* AFS directory */ 187 #define EXT2_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 188 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 189 #define EXT2_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 190 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 191 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 192 193 #define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 194 #define EXT2_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 195 196 /* 197 * ioctl commands 198 */ 199 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 200 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 201 #define EXT2_IOC_GETVERSION _IOR('v', 1, long) 202 #define EXT2_IOC_SETVERSION _IOW('v', 2, long) 203 204 /* 205 * Structure of an inode on the disk 206 */ 207 struct ext2_inode { 208 __le16 i_mode; /* File mode */ 209 __le16 i_uid; /* Low 16 bits of Owner Uid */ 210 __le32 i_size; /* Size in bytes */ 211 __le32 i_atime; /* Access time */ 212 __le32 i_ctime; /* Creation time */ 213 __le32 i_mtime; /* Modification time */ 214 __le32 i_dtime; /* Deletion Time */ 215 __le16 i_gid; /* Low 16 bits of Group Id */ 216 __le16 i_links_count; /* Links count */ 217 __le32 i_blocks; /* Blocks count */ 218 __le32 i_flags; /* File flags */ 219 union { 220 struct { 221 __le32 l_i_reserved1; 222 } linux1; 223 struct { 224 __le32 h_i_translator; 225 } hurd1; 226 struct { 227 __le32 m_i_reserved1; 228 } masix1; 229 } osd1; /* OS dependent 1 */ 230 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 231 __le32 i_generation; /* File version (for NFS) */ 232 __le32 i_file_acl; /* File ACL */ 233 __le32 i_dir_acl; /* Directory ACL */ 234 __le32 i_faddr; /* Fragment address */ 235 union { 236 struct { 237 __u8 l_i_frag; /* Fragment number */ 238 __u8 l_i_fsize; /* Fragment size */ 239 __u16 i_pad1; 240 __le16 l_i_uid_high; /* these 2 fields */ 241 __le16 l_i_gid_high; /* were reserved2[0] */ 242 __u32 l_i_reserved2; 243 } linux2; 244 struct { 245 __u8 h_i_frag; /* Fragment number */ 246 __u8 h_i_fsize; /* Fragment size */ 247 __le16 h_i_mode_high; 248 __le16 h_i_uid_high; 249 __le16 h_i_gid_high; 250 __le32 h_i_author; 251 } hurd2; 252 struct { 253 __u8 m_i_frag; /* Fragment number */ 254 __u8 m_i_fsize; /* Fragment size */ 255 __u16 m_pad1; 256 __u32 m_i_reserved2[2]; 257 } masix2; 258 } osd2; /* OS dependent 2 */ 259 }; 260 261 #define i_size_high i_dir_acl 262 263 #if defined(__KERNEL__) || defined(__linux__) 264 #define i_reserved1 osd1.linux1.l_i_reserved1 265 #define i_frag osd2.linux2.l_i_frag 266 #define i_fsize osd2.linux2.l_i_fsize 267 #define i_uid_low i_uid 268 #define i_gid_low i_gid 269 #define i_uid_high osd2.linux2.l_i_uid_high 270 #define i_gid_high osd2.linux2.l_i_gid_high 271 #define i_reserved2 osd2.linux2.l_i_reserved2 272 #endif 273 274 #ifdef __hurd__ 275 #define i_translator osd1.hurd1.h_i_translator 276 #define i_frag osd2.hurd2.h_i_frag; 277 #define i_fsize osd2.hurd2.h_i_fsize; 278 #define i_uid_high osd2.hurd2.h_i_uid_high 279 #define i_gid_high osd2.hurd2.h_i_gid_high 280 #define i_author osd2.hurd2.h_i_author 281 #endif 282 283 #ifdef __masix__ 284 #define i_reserved1 osd1.masix1.m_i_reserved1 285 #define i_frag osd2.masix2.m_i_frag 286 #define i_fsize osd2.masix2.m_i_fsize 287 #define i_reserved2 osd2.masix2.m_i_reserved2 288 #endif 289 290 /* 291 * File system states 292 */ 293 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 294 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 295 296 /* 297 * Mount flags 298 */ 299 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 300 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 301 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 302 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 303 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 304 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 305 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 306 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 307 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 308 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 309 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 310 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 311 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 312 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 313 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 314 315 316 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 317 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 318 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 319 EXT2_MOUNT_##opt) 320 /* 321 * Maximal mount counts between two filesystem checks 322 */ 323 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 324 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 325 326 /* 327 * Behaviour when detecting errors 328 */ 329 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 330 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 331 #define EXT2_ERRORS_PANIC 3 /* Panic */ 332 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 333 334 /* 335 * Structure of the super block 336 */ 337 struct ext2_super_block { 338 __le32 s_inodes_count; /* Inodes count */ 339 __le32 s_blocks_count; /* Blocks count */ 340 __le32 s_r_blocks_count; /* Reserved blocks count */ 341 __le32 s_free_blocks_count; /* Free blocks count */ 342 __le32 s_free_inodes_count; /* Free inodes count */ 343 __le32 s_first_data_block; /* First Data Block */ 344 __le32 s_log_block_size; /* Block size */ 345 __le32 s_log_frag_size; /* Fragment size */ 346 __le32 s_blocks_per_group; /* # Blocks per group */ 347 __le32 s_frags_per_group; /* # Fragments per group */ 348 __le32 s_inodes_per_group; /* # Inodes per group */ 349 __le32 s_mtime; /* Mount time */ 350 __le32 s_wtime; /* Write time */ 351 __le16 s_mnt_count; /* Mount count */ 352 __le16 s_max_mnt_count; /* Maximal mount count */ 353 __le16 s_magic; /* Magic signature */ 354 __le16 s_state; /* File system state */ 355 __le16 s_errors; /* Behaviour when detecting errors */ 356 __le16 s_minor_rev_level; /* minor revision level */ 357 __le32 s_lastcheck; /* time of last check */ 358 __le32 s_checkinterval; /* max. time between checks */ 359 __le32 s_creator_os; /* OS */ 360 __le32 s_rev_level; /* Revision level */ 361 __le16 s_def_resuid; /* Default uid for reserved blocks */ 362 __le16 s_def_resgid; /* Default gid for reserved blocks */ 363 /* 364 * These fields are for EXT2_DYNAMIC_REV superblocks only. 365 * 366 * Note: the difference between the compatible feature set and 367 * the incompatible feature set is that if there is a bit set 368 * in the incompatible feature set that the kernel doesn't 369 * know about, it should refuse to mount the filesystem. 370 * 371 * e2fsck's requirements are more strict; if it doesn't know 372 * about a feature in either the compatible or incompatible 373 * feature set, it must abort and not try to meddle with 374 * things it doesn't understand... 375 */ 376 __le32 s_first_ino; /* First non-reserved inode */ 377 __le16 s_inode_size; /* size of inode structure */ 378 __le16 s_block_group_nr; /* block group # of this superblock */ 379 __le32 s_feature_compat; /* compatible feature set */ 380 __le32 s_feature_incompat; /* incompatible feature set */ 381 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 382 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 383 char s_volume_name[16]; /* volume name */ 384 char s_last_mounted[64]; /* directory where last mounted */ 385 __le32 s_algorithm_usage_bitmap; /* For compression */ 386 /* 387 * Performance hints. Directory preallocation should only 388 * happen if the EXT2_COMPAT_PREALLOC flag is on. 389 */ 390 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 391 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 392 __u16 s_padding1; 393 /* 394 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 395 */ 396 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 397 __u32 s_journal_inum; /* inode number of journal file */ 398 __u32 s_journal_dev; /* device number of journal file */ 399 __u32 s_last_orphan; /* start of list of inodes to delete */ 400 __u32 s_hash_seed[4]; /* HTREE hash seed */ 401 __u8 s_def_hash_version; /* Default hash version to use */ 402 __u8 s_reserved_char_pad; 403 __u16 s_reserved_word_pad; 404 __le32 s_default_mount_opts; 405 __le32 s_first_meta_bg; /* First metablock block group */ 406 __u32 s_reserved[190]; /* Padding to the end of the block */ 407 }; 408 409 /* 410 * Codes for operating systems 411 */ 412 #define EXT2_OS_LINUX 0 413 #define EXT2_OS_HURD 1 414 #define EXT2_OS_MASIX 2 415 #define EXT2_OS_FREEBSD 3 416 #define EXT2_OS_LITES 4 417 418 /* 419 * Revision levels 420 */ 421 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 422 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 423 424 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 425 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 426 427 #define EXT2_GOOD_OLD_INODE_SIZE 128 428 429 /* 430 * Feature set definitions 431 */ 432 433 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 434 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 435 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 436 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 437 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 438 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 439 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 440 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 441 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 442 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 443 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 444 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 445 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 446 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 447 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 448 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 449 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 450 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 451 452 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 453 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 454 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 455 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 456 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 457 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 458 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 459 460 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 461 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 462 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 463 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 464 465 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 466 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 467 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 468 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 469 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 470 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 471 472 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 473 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 474 EXT2_FEATURE_INCOMPAT_META_BG) 475 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 476 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 477 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 478 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 479 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 480 481 /* 482 * Default values for user and/or group using reserved blocks 483 */ 484 #define EXT2_DEF_RESUID 0 485 #define EXT2_DEF_RESGID 0 486 487 /* 488 * Default mount options 489 */ 490 #define EXT2_DEFM_DEBUG 0x0001 491 #define EXT2_DEFM_BSDGROUPS 0x0002 492 #define EXT2_DEFM_XATTR_USER 0x0004 493 #define EXT2_DEFM_ACL 0x0008 494 #define EXT2_DEFM_UID16 0x0010 495 /* Not used by ext2, but reserved for use by ext3 */ 496 #define EXT3_DEFM_JMODE 0x0060 497 #define EXT3_DEFM_JMODE_DATA 0x0020 498 #define EXT3_DEFM_JMODE_ORDERED 0x0040 499 #define EXT3_DEFM_JMODE_WBACK 0x0060 500 501 /* 502 * Structure of a directory entry 503 */ 504 #define EXT2_NAME_LEN 255 505 506 struct ext2_dir_entry { 507 __le32 inode; /* Inode number */ 508 __le16 rec_len; /* Directory entry length */ 509 __le16 name_len; /* Name length */ 510 char name[EXT2_NAME_LEN]; /* File name */ 511 }; 512 513 /* 514 * The new version of the directory entry. Since EXT2 structures are 515 * stored in intel byte order, and the name_len field could never be 516 * bigger than 255 chars, it's safe to reclaim the extra byte for the 517 * file_type field. 518 */ 519 struct ext2_dir_entry_2 { 520 __le32 inode; /* Inode number */ 521 __le16 rec_len; /* Directory entry length */ 522 __u8 name_len; /* Name length */ 523 __u8 file_type; 524 char name[EXT2_NAME_LEN]; /* File name */ 525 }; 526 527 /* 528 * Ext2 directory file types. Only the low 3 bits are used. The 529 * other bits are reserved for now. 530 */ 531 enum { 532 EXT2_FT_UNKNOWN, 533 EXT2_FT_REG_FILE, 534 EXT2_FT_DIR, 535 EXT2_FT_CHRDEV, 536 EXT2_FT_BLKDEV, 537 EXT2_FT_FIFO, 538 EXT2_FT_SOCK, 539 EXT2_FT_SYMLINK, 540 EXT2_FT_MAX 541 }; 542 543 /* 544 * EXT2_DIR_PAD defines the directory entries boundaries 545 * 546 * NOTE: It must be a multiple of 4 547 */ 548 #define EXT2_DIR_PAD 4 549 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 550 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 551 ~EXT2_DIR_ROUND) 552 553 #endif /* _LINUX_EXT2_FS_H */ 554