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__, __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 #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 /* 198 * ioctl commands 199 */ 200 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 201 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 202 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 203 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 204 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 205 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 206 207 /* 208 * ioctl commands in 32 bit emulation 209 */ 210 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 211 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 212 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 213 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 214 215 /* 216 * Structure of an inode on the disk 217 */ 218 struct ext2_inode { 219 __le16 i_mode; /* File mode */ 220 __le16 i_uid; /* Low 16 bits of Owner Uid */ 221 __le32 i_size; /* Size in bytes */ 222 __le32 i_atime; /* Access time */ 223 __le32 i_ctime; /* Creation time */ 224 __le32 i_mtime; /* Modification time */ 225 __le32 i_dtime; /* Deletion Time */ 226 __le16 i_gid; /* Low 16 bits of Group Id */ 227 __le16 i_links_count; /* Links count */ 228 __le32 i_blocks; /* Blocks count */ 229 __le32 i_flags; /* File flags */ 230 union { 231 struct { 232 __le32 l_i_reserved1; 233 } linux1; 234 struct { 235 __le32 h_i_translator; 236 } hurd1; 237 struct { 238 __le32 m_i_reserved1; 239 } masix1; 240 } osd1; /* OS dependent 1 */ 241 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 242 __le32 i_generation; /* File version (for NFS) */ 243 __le32 i_file_acl; /* File ACL */ 244 __le32 i_dir_acl; /* Directory ACL */ 245 __le32 i_faddr; /* Fragment address */ 246 union { 247 struct { 248 __u8 l_i_frag; /* Fragment number */ 249 __u8 l_i_fsize; /* Fragment size */ 250 __u16 i_pad1; 251 __le16 l_i_uid_high; /* these 2 fields */ 252 __le16 l_i_gid_high; /* were reserved2[0] */ 253 __u32 l_i_reserved2; 254 } linux2; 255 struct { 256 __u8 h_i_frag; /* Fragment number */ 257 __u8 h_i_fsize; /* Fragment size */ 258 __le16 h_i_mode_high; 259 __le16 h_i_uid_high; 260 __le16 h_i_gid_high; 261 __le32 h_i_author; 262 } hurd2; 263 struct { 264 __u8 m_i_frag; /* Fragment number */ 265 __u8 m_i_fsize; /* Fragment size */ 266 __u16 m_pad1; 267 __u32 m_i_reserved2[2]; 268 } masix2; 269 } osd2; /* OS dependent 2 */ 270 }; 271 272 #define i_size_high i_dir_acl 273 274 #if defined(__KERNEL__) || defined(__linux__) 275 #define i_reserved1 osd1.linux1.l_i_reserved1 276 #define i_frag osd2.linux2.l_i_frag 277 #define i_fsize osd2.linux2.l_i_fsize 278 #define i_uid_low i_uid 279 #define i_gid_low i_gid 280 #define i_uid_high osd2.linux2.l_i_uid_high 281 #define i_gid_high osd2.linux2.l_i_gid_high 282 #define i_reserved2 osd2.linux2.l_i_reserved2 283 #endif 284 285 #ifdef __hurd__ 286 #define i_translator osd1.hurd1.h_i_translator 287 #define i_frag osd2.hurd2.h_i_frag; 288 #define i_fsize osd2.hurd2.h_i_fsize; 289 #define i_uid_high osd2.hurd2.h_i_uid_high 290 #define i_gid_high osd2.hurd2.h_i_gid_high 291 #define i_author osd2.hurd2.h_i_author 292 #endif 293 294 #ifdef __masix__ 295 #define i_reserved1 osd1.masix1.m_i_reserved1 296 #define i_frag osd2.masix2.m_i_frag 297 #define i_fsize osd2.masix2.m_i_fsize 298 #define i_reserved2 osd2.masix2.m_i_reserved2 299 #endif 300 301 /* 302 * File system states 303 */ 304 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 305 #define EXT2_ERROR_FS 0x0002 /* Errors detected */ 306 307 /* 308 * Mount flags 309 */ 310 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 311 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 312 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 313 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 314 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 315 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 316 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 317 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 318 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 319 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 320 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 321 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 322 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 323 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 324 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 325 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 326 327 328 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 329 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt 330 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 331 EXT2_MOUNT_##opt) 332 /* 333 * Maximal mount counts between two filesystem checks 334 */ 335 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 336 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 337 338 /* 339 * Behaviour when detecting errors 340 */ 341 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 342 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 343 #define EXT2_ERRORS_PANIC 3 /* Panic */ 344 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 345 346 /* 347 * Structure of the super block 348 */ 349 struct ext2_super_block { 350 __le32 s_inodes_count; /* Inodes count */ 351 __le32 s_blocks_count; /* Blocks count */ 352 __le32 s_r_blocks_count; /* Reserved blocks count */ 353 __le32 s_free_blocks_count; /* Free blocks count */ 354 __le32 s_free_inodes_count; /* Free inodes count */ 355 __le32 s_first_data_block; /* First Data Block */ 356 __le32 s_log_block_size; /* Block size */ 357 __le32 s_log_frag_size; /* Fragment size */ 358 __le32 s_blocks_per_group; /* # Blocks per group */ 359 __le32 s_frags_per_group; /* # Fragments per group */ 360 __le32 s_inodes_per_group; /* # Inodes per group */ 361 __le32 s_mtime; /* Mount time */ 362 __le32 s_wtime; /* Write time */ 363 __le16 s_mnt_count; /* Mount count */ 364 __le16 s_max_mnt_count; /* Maximal mount count */ 365 __le16 s_magic; /* Magic signature */ 366 __le16 s_state; /* File system state */ 367 __le16 s_errors; /* Behaviour when detecting errors */ 368 __le16 s_minor_rev_level; /* minor revision level */ 369 __le32 s_lastcheck; /* time of last check */ 370 __le32 s_checkinterval; /* max. time between checks */ 371 __le32 s_creator_os; /* OS */ 372 __le32 s_rev_level; /* Revision level */ 373 __le16 s_def_resuid; /* Default uid for reserved blocks */ 374 __le16 s_def_resgid; /* Default gid for reserved blocks */ 375 /* 376 * These fields are for EXT2_DYNAMIC_REV superblocks only. 377 * 378 * Note: the difference between the compatible feature set and 379 * the incompatible feature set is that if there is a bit set 380 * in the incompatible feature set that the kernel doesn't 381 * know about, it should refuse to mount the filesystem. 382 * 383 * e2fsck's requirements are more strict; if it doesn't know 384 * about a feature in either the compatible or incompatible 385 * feature set, it must abort and not try to meddle with 386 * things it doesn't understand... 387 */ 388 __le32 s_first_ino; /* First non-reserved inode */ 389 __le16 s_inode_size; /* size of inode structure */ 390 __le16 s_block_group_nr; /* block group # of this superblock */ 391 __le32 s_feature_compat; /* compatible feature set */ 392 __le32 s_feature_incompat; /* incompatible feature set */ 393 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 394 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 395 char s_volume_name[16]; /* volume name */ 396 char s_last_mounted[64]; /* directory where last mounted */ 397 __le32 s_algorithm_usage_bitmap; /* For compression */ 398 /* 399 * Performance hints. Directory preallocation should only 400 * happen if the EXT2_COMPAT_PREALLOC flag is on. 401 */ 402 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 403 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 404 __u16 s_padding1; 405 /* 406 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 407 */ 408 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 409 __u32 s_journal_inum; /* inode number of journal file */ 410 __u32 s_journal_dev; /* device number of journal file */ 411 __u32 s_last_orphan; /* start of list of inodes to delete */ 412 __u32 s_hash_seed[4]; /* HTREE hash seed */ 413 __u8 s_def_hash_version; /* Default hash version to use */ 414 __u8 s_reserved_char_pad; 415 __u16 s_reserved_word_pad; 416 __le32 s_default_mount_opts; 417 __le32 s_first_meta_bg; /* First metablock block group */ 418 __u32 s_reserved[190]; /* Padding to the end of the block */ 419 }; 420 421 /* 422 * Codes for operating systems 423 */ 424 #define EXT2_OS_LINUX 0 425 #define EXT2_OS_HURD 1 426 #define EXT2_OS_MASIX 2 427 #define EXT2_OS_FREEBSD 3 428 #define EXT2_OS_LITES 4 429 430 /* 431 * Revision levels 432 */ 433 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 434 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 435 436 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 437 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 438 439 #define EXT2_GOOD_OLD_INODE_SIZE 128 440 441 /* 442 * Feature set definitions 443 */ 444 445 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 446 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 447 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 448 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 449 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 450 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 451 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 452 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 453 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 454 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 455 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 456 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 457 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 458 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 459 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 460 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 461 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 462 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 463 464 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 465 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 466 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 467 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 468 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 469 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 470 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff 471 472 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 473 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 474 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 475 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 476 477 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 478 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 479 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 480 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 481 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 482 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 483 484 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 485 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 486 EXT2_FEATURE_INCOMPAT_META_BG) 487 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 488 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 489 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 490 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 491 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 492 493 /* 494 * Default values for user and/or group using reserved blocks 495 */ 496 #define EXT2_DEF_RESUID 0 497 #define EXT2_DEF_RESGID 0 498 499 /* 500 * Default mount options 501 */ 502 #define EXT2_DEFM_DEBUG 0x0001 503 #define EXT2_DEFM_BSDGROUPS 0x0002 504 #define EXT2_DEFM_XATTR_USER 0x0004 505 #define EXT2_DEFM_ACL 0x0008 506 #define EXT2_DEFM_UID16 0x0010 507 /* Not used by ext2, but reserved for use by ext3 */ 508 #define EXT3_DEFM_JMODE 0x0060 509 #define EXT3_DEFM_JMODE_DATA 0x0020 510 #define EXT3_DEFM_JMODE_ORDERED 0x0040 511 #define EXT3_DEFM_JMODE_WBACK 0x0060 512 513 /* 514 * Structure of a directory entry 515 */ 516 #define EXT2_NAME_LEN 255 517 518 struct ext2_dir_entry { 519 __le32 inode; /* Inode number */ 520 __le16 rec_len; /* Directory entry length */ 521 __le16 name_len; /* Name length */ 522 char name[EXT2_NAME_LEN]; /* File name */ 523 }; 524 525 /* 526 * The new version of the directory entry. Since EXT2 structures are 527 * stored in intel byte order, and the name_len field could never be 528 * bigger than 255 chars, it's safe to reclaim the extra byte for the 529 * file_type field. 530 */ 531 struct ext2_dir_entry_2 { 532 __le32 inode; /* Inode number */ 533 __le16 rec_len; /* Directory entry length */ 534 __u8 name_len; /* Name length */ 535 __u8 file_type; 536 char name[EXT2_NAME_LEN]; /* File name */ 537 }; 538 539 /* 540 * Ext2 directory file types. Only the low 3 bits are used. The 541 * other bits are reserved for now. 542 */ 543 enum { 544 EXT2_FT_UNKNOWN, 545 EXT2_FT_REG_FILE, 546 EXT2_FT_DIR, 547 EXT2_FT_CHRDEV, 548 EXT2_FT_BLKDEV, 549 EXT2_FT_FIFO, 550 EXT2_FT_SOCK, 551 EXT2_FT_SYMLINK, 552 EXT2_FT_MAX 553 }; 554 555 /* 556 * EXT2_DIR_PAD defines the directory entries boundaries 557 * 558 * NOTE: It must be a multiple of 4 559 */ 560 #define EXT2_DIR_PAD 4 561 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 562 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 563 ~EXT2_DIR_ROUND) 564 565 static inline ext2_fsblk_t 566 ext2_group_first_block_no(struct super_block *sb, unsigned long group_no) 567 { 568 return group_no * (ext2_fsblk_t)EXT2_BLOCKS_PER_GROUP(sb) + 569 le32_to_cpu(EXT2_SB(sb)->s_es->s_first_data_block); 570 } 571 572 #endif /* _LINUX_EXT2_FS_H */ 573