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_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__, __func__); \ 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 #ifdef __KERNEL__ 69 #include <linux/ext2_fs_sb.h> 70 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 71 { 72 return sb->s_fs_info; 73 } 74 #else 75 /* Assume that user mode programs are passing in an ext2fs superblock, not 76 * a kernel struct super_block. This will allow us to call the feature-test 77 * macros from user land. */ 78 #define EXT2_SB(sb) (sb) 79 #endif 80 81 /* 82 * Maximal count of links to a file 83 */ 84 #define EXT2_LINK_MAX 32000 85 86 /* 87 * Macro-instructions used to manage several block sizes 88 */ 89 #define EXT2_MIN_BLOCK_SIZE 1024 90 #define EXT2_MAX_BLOCK_SIZE 4096 91 #define EXT2_MIN_BLOCK_LOG_SIZE 10 92 #ifdef __KERNEL__ 93 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 94 #else 95 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 96 #endif 97 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 98 #ifdef __KERNEL__ 99 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 100 #else 101 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 102 #endif 103 #ifdef __KERNEL__ 104 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 105 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 106 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 107 #else 108 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 109 EXT2_GOOD_OLD_INODE_SIZE : \ 110 (s)->s_inode_size) 111 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 112 EXT2_GOOD_OLD_FIRST_INO : \ 113 (s)->s_first_ino) 114 #endif 115 116 /* 117 * Macro-instructions used to manage fragments 118 */ 119 #define EXT2_MIN_FRAG_SIZE 1024 120 #define EXT2_MAX_FRAG_SIZE 4096 121 #define EXT2_MIN_FRAG_LOG_SIZE 10 122 #ifdef __KERNEL__ 123 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 124 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 125 #else 126 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 127 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 128 #endif 129 130 /* 131 * Structure of a blocks group descriptor 132 */ 133 struct ext2_group_desc 134 { 135 __le32 bg_block_bitmap; /* Blocks bitmap block */ 136 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 137 __le32 bg_inode_table; /* Inodes table block */ 138 __le16 bg_free_blocks_count; /* Free blocks count */ 139 __le16 bg_free_inodes_count; /* Free inodes count */ 140 __le16 bg_used_dirs_count; /* Directories count */ 141 __le16 bg_pad; 142 __le32 bg_reserved[3]; 143 }; 144 145 /* 146 * Macro-instructions used to manage group descriptors 147 */ 148 #ifdef __KERNEL__ 149 # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 150 # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 151 # define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 152 # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 153 #else 154 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 155 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 156 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 157 #endif 158 159 /* 160 * Constants relative to the data blocks 161 */ 162 #define EXT2_NDIR_BLOCKS 12 163 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 164 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 165 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 166 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 167 168 /* 169 * Inode flags (GETFLAGS/SETFLAGS) 170 */ 171 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 172 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 173 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 174 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 175 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 176 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 177 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 178 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 179 /* Reserved for compression usage... */ 180 #define EXT2_DIRTY_FL FS_DIRTY_FL 181 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 182 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 183 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 184 /* End compression flags --- maybe not all used */ 185 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 186 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 187 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 188 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 189 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 190 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 191 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 192 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 193 194 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 195 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 196 197 /* Flags that should be inherited by new inodes from their parent. */ 198 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 199 EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\ 200 EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\ 201 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 202 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 203 204 /* 205 * ioctl commands 206 */ 207 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 208 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 209 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 210 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 211 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 212 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 213 214 /* 215 * ioctl commands in 32 bit emulation 216 */ 217 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 218 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 219 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 220 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 221 222 /* 223 * Structure of an inode on the disk 224 */ 225 struct ext2_inode { 226 __le16 i_mode; /* File mode */ 227 __le16 i_uid; /* Low 16 bits of Owner Uid */ 228 __le32 i_size; /* Size in bytes */ 229 __le32 i_atime; /* Access time */ 230 __le32 i_ctime; /* Creation time */ 231 __le32 i_mtime; /* Modification time */ 232 __le32 i_dtime; /* Deletion Time */ 233 __le16 i_gid; /* Low 16 bits of Group Id */ 234 __le16 i_links_count; /* Links count */ 235 __le32 i_blocks; /* Blocks count */ 236 __le32 i_flags; /* File flags */ 237 union { 238 struct { 239 __le32 l_i_reserved1; 240 } linux1; 241 struct { 242 __le32 h_i_translator; 243 } hurd1; 244 struct { 245 __le32 m_i_reserved1; 246 } masix1; 247 } osd1; /* OS dependent 1 */ 248 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 249 __le32 i_generation; /* File version (for NFS) */ 250 __le32 i_file_acl; /* File ACL */ 251 __le32 i_dir_acl; /* Directory ACL */ 252 __le32 i_faddr; /* Fragment address */ 253 union { 254 struct { 255 __u8 l_i_frag; /* Fragment number */ 256 __u8 l_i_fsize; /* Fragment size */ 257 __u16 i_pad1; 258 __le16 l_i_uid_high; /* these 2 fields */ 259 __le16 l_i_gid_high; /* were reserved2[0] */ 260 __u32 l_i_reserved2; 261 } linux2; 262 struct { 263 __u8 h_i_frag; /* Fragment number */ 264 __u8 h_i_fsize; /* Fragment size */ 265 __le16 h_i_mode_high; 266 __le16 h_i_uid_high; 267 __le16 h_i_gid_high; 268 __le32 h_i_author; 269 } hurd2; 270 struct { 271 __u8 m_i_frag; /* Fragment number */ 272 __u8 m_i_fsize; /* Fragment size */ 273 __u16 m_pad1; 274 __u32 m_i_reserved2[2]; 275 } masix2; 276 } osd2; /* OS dependent 2 */ 277 }; 278 279 #define i_size_high i_dir_acl 280 281 #if defined(__KERNEL__) || defined(__linux__) 282 #define i_reserved1 osd1.linux1.l_i_reserved1 283 #define i_frag osd2.linux2.l_i_frag 284 #define i_fsize osd2.linux2.l_i_fsize 285 #define i_uid_low i_uid 286 #define i_gid_low i_gid 287 #define i_uid_high osd2.linux2.l_i_uid_high 288 #define i_gid_high osd2.linux2.l_i_gid_high 289 #define i_reserved2 osd2.linux2.l_i_reserved2 290 #endif 291 292 #ifdef __hurd__ 293 #define i_translator osd1.hurd1.h_i_translator 294 #define i_frag osd2.hurd2.h_i_frag 295 #define i_fsize osd2.hurd2.h_i_fsize 296 #define i_uid_high osd2.hurd2.h_i_uid_high 297 #define i_gid_high osd2.hurd2.h_i_gid_high 298 #define i_author osd2.hurd2.h_i_author 299 #endif 300 301 #ifdef __masix__ 302 #define i_reserved1 osd1.masix1.m_i_reserved1 303 #define i_frag osd2.masix2.m_i_frag 304 #define i_fsize osd2.masix2.m_i_fsize 305 #define i_reserved2 osd2.masix2.m_i_reserved2 306 #endif 307 308 /* 309 * File system states 310 */ 311 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 312 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 313 314 /* 315 * Mount flags 316 */ 317 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 318 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 319 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 320 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 321 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 322 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 323 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 324 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 325 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 326 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 327 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 328 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 329 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 330 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 331 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 332 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 333 334 335 #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 */ 356 struct ext2_super_block { 357 __le32 s_inodes_count; /* Inodes count */ 358 __le32 s_blocks_count; /* Blocks count */ 359 __le32 s_r_blocks_count; /* Reserved blocks count */ 360 __le32 s_free_blocks_count; /* Free blocks count */ 361 __le32 s_free_inodes_count; /* Free inodes count */ 362 __le32 s_first_data_block; /* First Data Block */ 363 __le32 s_log_block_size; /* Block size */ 364 __le32 s_log_frag_size; /* Fragment size */ 365 __le32 s_blocks_per_group; /* # Blocks per group */ 366 __le32 s_frags_per_group; /* # Fragments per group */ 367 __le32 s_inodes_per_group; /* # Inodes per group */ 368 __le32 s_mtime; /* Mount time */ 369 __le32 s_wtime; /* Write time */ 370 __le16 s_mnt_count; /* Mount count */ 371 __le16 s_max_mnt_count; /* Maximal mount count */ 372 __le16 s_magic; /* Magic signature */ 373 __le16 s_state; /* File system state */ 374 __le16 s_errors; /* Behaviour when detecting errors */ 375 __le16 s_minor_rev_level; /* minor revision level */ 376 __le32 s_lastcheck; /* time of last check */ 377 __le32 s_checkinterval; /* max. time between checks */ 378 __le32 s_creator_os; /* OS */ 379 __le32 s_rev_level; /* Revision level */ 380 __le16 s_def_resuid; /* Default uid for reserved blocks */ 381 __le16 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 __le32 s_first_ino; /* First non-reserved inode */ 396 __le16 s_inode_size; /* size of inode structure */ 397 __le16 s_block_group_nr; /* block group # of this superblock */ 398 __le32 s_feature_compat; /* compatible feature set */ 399 __le32 s_feature_incompat; /* incompatible feature set */ 400 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 401 __u8 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 __le32 s_algorithm_usage_bitmap; /* For compression */ 405 /* 406 * Performance hints. Directory preallocation should only 407 * happen if the EXT2_COMPAT_PREALLOC flag is on. 408 */ 409 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 410 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 411 __u16 s_padding1; 412 /* 413 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 414 */ 415 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 416 __u32 s_journal_inum; /* inode number of journal file */ 417 __u32 s_journal_dev; /* device number of journal file */ 418 __u32 s_last_orphan; /* start of list of inodes to delete */ 419 __u32 s_hash_seed[4]; /* HTREE hash seed */ 420 __u8 s_def_hash_version; /* Default hash version to use */ 421 __u8 s_reserved_char_pad; 422 __u16 s_reserved_word_pad; 423 __le32 s_default_mount_opts; 424 __le32 s_first_meta_bg; /* First metablock block group */ 425 __u32 s_reserved[190]; /* Padding to the end of the block */ 426 }; 427 428 /* 429 * Codes for operating systems 430 */ 431 #define EXT2_OS_LINUX 0 432 #define EXT2_OS_HURD 1 433 #define EXT2_OS_MASIX 2 434 #define EXT2_OS_FREEBSD 3 435 #define EXT2_OS_LITES 4 436 437 /* 438 * Revision levels 439 */ 440 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 441 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 442 443 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 444 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 445 446 #define EXT2_GOOD_OLD_INODE_SIZE 128 447 448 /* 449 * Feature set definitions 450 */ 451 452 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 453 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 454 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 455 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 456 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 457 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 458 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 459 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 460 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 461 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 462 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 463 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 464 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 465 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 466 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 467 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 468 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 469 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 470 471 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 472 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 473 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 474 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 475 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 476 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 477 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 478 479 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 480 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 481 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 482 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 483 484 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 485 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 486 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 487 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 488 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 489 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 490 491 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 492 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 493 EXT2_FEATURE_INCOMPAT_META_BG) 494 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 495 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 496 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 497 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 498 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 499 500 /* 501 * Default values for user and/or group using reserved blocks 502 */ 503 #define EXT2_DEF_RESUID 0 504 #define EXT2_DEF_RESGID 0 505 506 /* 507 * Default mount options 508 */ 509 #define EXT2_DEFM_DEBUG 0x0001 510 #define EXT2_DEFM_BSDGROUPS 0x0002 511 #define EXT2_DEFM_XATTR_USER 0x0004 512 #define EXT2_DEFM_ACL 0x0008 513 #define EXT2_DEFM_UID16 0x0010 514 /* Not used by ext2, but reserved for use by ext3 */ 515 #define EXT3_DEFM_JMODE 0x0060 516 #define EXT3_DEFM_JMODE_DATA 0x0020 517 #define EXT3_DEFM_JMODE_ORDERED 0x0040 518 #define EXT3_DEFM_JMODE_WBACK 0x0060 519 520 /* 521 * Structure of a directory entry 522 */ 523 #define EXT2_NAME_LEN 255 524 525 struct ext2_dir_entry { 526 __le32 inode; /* Inode number */ 527 __le16 rec_len; /* Directory entry length */ 528 __le16 name_len; /* Name length */ 529 char name[EXT2_NAME_LEN]; /* File name */ 530 }; 531 532 /* 533 * The new version of the directory entry. Since EXT2 structures are 534 * stored in intel byte order, and the name_len field could never be 535 * bigger than 255 chars, it's safe to reclaim the extra byte for the 536 * file_type field. 537 */ 538 struct ext2_dir_entry_2 { 539 __le32 inode; /* Inode number */ 540 __le16 rec_len; /* Directory entry length */ 541 __u8 name_len; /* Name length */ 542 __u8 file_type; 543 char name[EXT2_NAME_LEN]; /* File name */ 544 }; 545 546 /* 547 * Ext2 directory file types. Only the low 3 bits are used. The 548 * other bits are reserved for now. 549 */ 550 enum { 551 EXT2_FT_UNKNOWN, 552 EXT2_FT_REG_FILE, 553 EXT2_FT_DIR, 554 EXT2_FT_CHRDEV, 555 EXT2_FT_BLKDEV, 556 EXT2_FT_FIFO, 557 EXT2_FT_SOCK, 558 EXT2_FT_SYMLINK, 559 EXT2_FT_MAX 560 }; 561 562 /* 563 * EXT2_DIR_PAD defines the directory entries boundaries 564 * 565 * NOTE: It must be a multiple of 4 566 */ 567 #define EXT2_DIR_PAD 4 568 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 569 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 570 ~EXT2_DIR_ROUND) 571 #define EXT2_MAX_REC_LEN ((1<<16)-1) 572 573 #endif /* _LINUX_EXT2_FS_H */ 574