ext2_fs.h revision 7331196a16e57ef80dd6ae40eeeab14747ce2f5d
1/* 2 * linux/include/linux/ext2_fs.h 3 * 4 * Copyright (C) 1992, 1993, 1994, 1995 5 * Remy Card (card@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 <ext2fs/ext2_types.h> /* Changed from 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 * Special inode numbers 44 */ 45#define EXT2_BAD_INO 1 /* Bad blocks inode */ 46#define EXT2_ROOT_INO 2 /* Root inode */ 47#define EXT2_ACL_IDX_INO 3 /* ACL inode */ 48#define EXT2_ACL_DATA_INO 4 /* ACL inode */ 49#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 50#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 51#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */ 52#define EXT2_JOURNAL_INO 8 /* Journal inode */ 53 54/* First non-reserved inode for old ext2 filesystems */ 55#define EXT2_GOOD_OLD_FIRST_INO 11 56 57/* 58 * The second extended file system magic number 59 */ 60#define EXT2_SUPER_MAGIC 0xEF53 61 62#ifdef __KERNEL__ 63#define EXT2_SB(sb) (&((sb)->u.ext2_sb)) 64#else 65/* Assume that user mode programs are passing in an ext2fs superblock, not 66 * a kernel struct super_block. This will allow us to call the feature-test 67 * macros from user land. */ 68#define EXT2_SB(sb) (sb) 69#endif 70 71/* 72 * Maximal count of links to a file 73 */ 74#define EXT2_LINK_MAX 32000 75 76/* 77 * Macro-instructions used to manage several block sizes 78 */ 79#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */ 80#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */ 81#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE) 82#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE) 83#ifdef __KERNEL__ 84#define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 85#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 86#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->addr_per_block_bits) 87#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 88#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 89#else 90#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 91#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 92#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 93 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size) 94#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 95 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino) 96#endif 97#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32)) 98 99/* 100 * Macro-instructions used to manage fragments 101 */ 102#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE 103#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE 104#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE 105#ifdef __KERNEL__ 106# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 107# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 108#else 109# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 110# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 111#endif 112 113/* 114 * ACL structures 115 */ 116struct ext2_acl_header /* Header of Access Control Lists */ 117{ 118 __u32 aclh_size; 119 __u32 aclh_file_count; 120 __u32 aclh_acle_count; 121 __u32 aclh_first_acle; 122}; 123 124struct ext2_acl_entry /* Access Control List Entry */ 125{ 126 __u32 acle_size; 127 __u16 acle_perms; /* Access permissions */ 128 __u16 acle_type; /* Type of entry */ 129 __u16 acle_tag; /* User or group identity */ 130 __u16 acle_pad1; 131 __u32 acle_next; /* Pointer on next entry for the */ 132 /* same inode or on next free entry */ 133}; 134 135/* 136 * Structure of a blocks group descriptor 137 */ 138struct ext2_group_desc 139{ 140 __u32 bg_block_bitmap; /* Blocks bitmap block */ 141 __u32 bg_inode_bitmap; /* Inodes bitmap block */ 142 __u32 bg_inode_table; /* Inodes table block */ 143 __u16 bg_free_blocks_count; /* Free blocks count */ 144 __u16 bg_free_inodes_count; /* Free inodes count */ 145 __u16 bg_used_dirs_count; /* Directories count */ 146 __u16 bg_pad; 147 __u32 bg_reserved[3]; 148}; 149 150/* 151 * Data structures used by the directory indexing feature 152 * 153 * Note: all of the multibyte integer fields are little endian. 154 */ 155 156/* 157 * Note: dx_root_info is laid out so that if it should somehow get 158 * overlaid by a dirent the two low bits of the hash version will be 159 * zero. Therefore, the hash version mod 4 should never be 0. 160 * Sincerely, the paranoia department. 161 */ 162struct ext2_dx_root_info { 163 __u32 reserved_zero; 164 __u8 hash_version; /* 0 now, 1 at release */ 165 __u8 info_length; /* 8 */ 166 __u8 indirect_levels; 167 __u8 unused_flags; 168}; 169 170#define EXT2_HASH_LEGACY 0 171#define EXT2_HASH_HALF_MD4 1 172#define EXT2_HASH_TEA 2 173 174#define EXT2_HASH_FLAG_INCOMPAT 0x1 175 176struct ext2_dx_entry { 177 __u32 hash; 178 __u32 block; 179}; 180 181struct ext2_dx_countlimit { 182 __u16 limit; 183 __u16 count; 184}; 185 186 187/* 188 * Macro-instructions used to manage group descriptors 189 */ 190#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 191#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 192#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 193/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 194#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 195#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 196#ifdef __KERNEL__ 197#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 198#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 199#else 200#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 201#endif 202 203/* 204 * Constants relative to the data blocks 205 */ 206#define EXT2_NDIR_BLOCKS 12 207#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 208#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 209#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 210#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 211 212/* 213 * Inode flags 214 */ 215#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 216#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 217#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 218#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 219#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 220#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 221#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 222#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 223/* Reserved for compression usage... */ 224#define EXT2_DIRTY_FL 0x00000100 225#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 226#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 227#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 228/* End compression flags --- maybe not all used */ 229#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 230#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 231#define EXT2_IMAGIC_FL 0x00002000 232#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 233#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 234#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 235#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 236#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */ 237#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 238 239#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 240#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */ 241 242/* 243 * ioctl commands 244 */ 245#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 246#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 247#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 248#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 249 250/* 251 * Structure of an inode on the disk 252 */ 253struct ext2_inode { 254 __u16 i_mode; /* File mode */ 255 __u16 i_uid; /* Low 16 bits of Owner Uid */ 256 __u32 i_size; /* Size in bytes */ 257 __u32 i_atime; /* Access time */ 258 __u32 i_ctime; /* Creation time */ 259 __u32 i_mtime; /* Modification time */ 260 __u32 i_dtime; /* Deletion Time */ 261 __u16 i_gid; /* Low 16 bits of Group Id */ 262 __u16 i_links_count; /* Links count */ 263 __u32 i_blocks; /* Blocks count */ 264 __u32 i_flags; /* File flags */ 265 union { 266 struct { 267 __u32 l_i_reserved1; 268 } linux1; 269 struct { 270 __u32 h_i_translator; 271 } hurd1; 272 struct { 273 __u32 m_i_reserved1; 274 } masix1; 275 } osd1; /* OS dependent 1 */ 276 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 277 __u32 i_generation; /* File version (for NFS) */ 278 __u32 i_file_acl; /* File ACL */ 279 __u32 i_dir_acl; /* Directory ACL */ 280 __u32 i_faddr; /* Fragment address */ 281 union { 282 struct { 283 __u8 l_i_frag; /* Fragment number */ 284 __u8 l_i_fsize; /* Fragment size */ 285 __u16 i_pad1; 286 __u16 l_i_uid_high; /* these 2 fields */ 287 __u16 l_i_gid_high; /* were reserved2[0] */ 288 __u32 l_i_reserved2; 289 } linux2; 290 struct { 291 __u8 h_i_frag; /* Fragment number */ 292 __u8 h_i_fsize; /* Fragment size */ 293 __u16 h_i_mode_high; 294 __u16 h_i_uid_high; 295 __u16 h_i_gid_high; 296 __u32 h_i_author; 297 } hurd2; 298 struct { 299 __u8 m_i_frag; /* Fragment number */ 300 __u8 m_i_fsize; /* Fragment size */ 301 __u16 m_pad1; 302 __u32 m_i_reserved2[2]; 303 } masix2; 304 } osd2; /* OS dependent 2 */ 305}; 306 307/* 308 * Permanent part of an large inode on the disk 309 */ 310struct ext2_inode_large { 311 __u16 i_mode; /* File mode */ 312 __u16 i_uid; /* Low 16 bits of Owner Uid */ 313 __u32 i_size; /* Size in bytes */ 314 __u32 i_atime; /* Access time */ 315 __u32 i_ctime; /* Creation time */ 316 __u32 i_mtime; /* Modification time */ 317 __u32 i_dtime; /* Deletion Time */ 318 __u16 i_gid; /* Low 16 bits of Group Id */ 319 __u16 i_links_count; /* Links count */ 320 __u32 i_blocks; /* Blocks count */ 321 __u32 i_flags; /* File flags */ 322 union { 323 struct { 324 __u32 l_i_reserved1; 325 } linux1; 326 struct { 327 __u32 h_i_translator; 328 } hurd1; 329 struct { 330 __u32 m_i_reserved1; 331 } masix1; 332 } osd1; /* OS dependent 1 */ 333 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 334 __u32 i_generation; /* File version (for NFS) */ 335 __u32 i_file_acl; /* File ACL */ 336 __u32 i_dir_acl; /* Directory ACL */ 337 __u32 i_faddr; /* Fragment address */ 338 union { 339 struct { 340 __u8 l_i_frag; /* Fragment number */ 341 __u8 l_i_fsize; /* Fragment size */ 342 __u16 i_pad1; 343 __u16 l_i_uid_high; /* these 2 fields */ 344 __u16 l_i_gid_high; /* were reserved2[0] */ 345 __u32 l_i_reserved2; 346 } linux2; 347 struct { 348 __u8 h_i_frag; /* Fragment number */ 349 __u8 h_i_fsize; /* Fragment size */ 350 __u16 h_i_mode_high; 351 __u16 h_i_uid_high; 352 __u16 h_i_gid_high; 353 __u32 h_i_author; 354 } hurd2; 355 struct { 356 __u8 m_i_frag; /* Fragment number */ 357 __u8 m_i_fsize; /* Fragment size */ 358 __u16 m_pad1; 359 __u32 m_i_reserved2[2]; 360 } masix2; 361 } osd2; /* OS dependent 2 */ 362 __u16 i_extra_isize; 363 __u16 i_pad1; 364}; 365 366#define i_size_high i_dir_acl 367 368#if defined(__KERNEL__) || defined(__linux__) 369#define i_reserved1 osd1.linux1.l_i_reserved1 370#define i_frag osd2.linux2.l_i_frag 371#define i_fsize osd2.linux2.l_i_fsize 372#define i_uid_low i_uid 373#define i_gid_low i_gid 374#define i_uid_high osd2.linux2.l_i_uid_high 375#define i_gid_high osd2.linux2.l_i_gid_high 376#define i_reserved2 osd2.linux2.l_i_reserved2 377 378#else 379#if defined(__GNU__) 380 381#define i_translator osd1.hurd1.h_i_translator 382#define i_frag osd2.hurd2.h_i_frag; 383#define i_fsize osd2.hurd2.h_i_fsize; 384#define i_uid_high osd2.hurd2.h_i_uid_high 385#define i_gid_high osd2.hurd2.h_i_gid_high 386#define i_author osd2.hurd2.h_i_author 387 388#else 389#if defined(__masix__) 390 391#define i_reserved1 osd1.masix1.m_i_reserved1 392#define i_frag osd2.masix2.m_i_frag 393#define i_fsize osd2.masix2.m_i_fsize 394#define i_reserved2 osd2.masix2.m_i_reserved2 395 396#endif /* __masix__ */ 397#endif /* __GNU__ */ 398#endif /* defined(__KERNEL__) || defined(__linux__) */ 399 400/* 401 * File system states 402 */ 403#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 404#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 405 406/* 407 * Mount flags 408 */ 409#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 410#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 411#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 412#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 413#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 414#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 415#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 416#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 417 418#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 419#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 420#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 421 EXT2_MOUNT_##opt) 422/* 423 * Maximal mount counts between two filesystem checks 424 */ 425#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 426#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 427 428/* 429 * Behaviour when detecting errors 430 */ 431#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 432#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 433#define EXT2_ERRORS_PANIC 3 /* Panic */ 434#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 435 436/* 437 * Structure of the super block 438 */ 439struct ext2_super_block { 440 __u32 s_inodes_count; /* Inodes count */ 441 __u32 s_blocks_count; /* Blocks count */ 442 __u32 s_r_blocks_count; /* Reserved blocks count */ 443 __u32 s_free_blocks_count; /* Free blocks count */ 444 __u32 s_free_inodes_count; /* Free inodes count */ 445 __u32 s_first_data_block; /* First Data Block */ 446 __u32 s_log_block_size; /* Block size */ 447 __s32 s_log_frag_size; /* Fragment size */ 448 __u32 s_blocks_per_group; /* # Blocks per group */ 449 __u32 s_frags_per_group; /* # Fragments per group */ 450 __u32 s_inodes_per_group; /* # Inodes per group */ 451 __u32 s_mtime; /* Mount time */ 452 __u32 s_wtime; /* Write time */ 453 __u16 s_mnt_count; /* Mount count */ 454 __s16 s_max_mnt_count; /* Maximal mount count */ 455 __u16 s_magic; /* Magic signature */ 456 __u16 s_state; /* File system state */ 457 __u16 s_errors; /* Behaviour when detecting errors */ 458 __u16 s_minor_rev_level; /* minor revision level */ 459 __u32 s_lastcheck; /* time of last check */ 460 __u32 s_checkinterval; /* max. time between checks */ 461 __u32 s_creator_os; /* OS */ 462 __u32 s_rev_level; /* Revision level */ 463 __u16 s_def_resuid; /* Default uid for reserved blocks */ 464 __u16 s_def_resgid; /* Default gid for reserved blocks */ 465 /* 466 * These fields are for EXT2_DYNAMIC_REV superblocks only. 467 * 468 * Note: the difference between the compatible feature set and 469 * the incompatible feature set is that if there is a bit set 470 * in the incompatible feature set that the kernel doesn't 471 * know about, it should refuse to mount the filesystem. 472 * 473 * e2fsck's requirements are more strict; if it doesn't know 474 * about a feature in either the compatible or incompatible 475 * feature set, it must abort and not try to meddle with 476 * things it doesn't understand... 477 */ 478 __u32 s_first_ino; /* First non-reserved inode */ 479 __u16 s_inode_size; /* size of inode structure */ 480 __u16 s_block_group_nr; /* block group # of this superblock */ 481 __u32 s_feature_compat; /* compatible feature set */ 482 __u32 s_feature_incompat; /* incompatible feature set */ 483 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 484 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 485 char s_volume_name[16]; /* volume name */ 486 char s_last_mounted[64]; /* directory where last mounted */ 487 __u32 s_algorithm_usage_bitmap; /* For compression */ 488 /* 489 * Performance hints. Directory preallocation should only 490 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 491 */ 492 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 493 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 494 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 495 /* 496 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 497 */ 498 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 499 __u32 s_journal_inum; /* inode number of journal file */ 500 __u32 s_journal_dev; /* device number of journal file */ 501 __u32 s_last_orphan; /* start of list of inodes to delete */ 502 __u32 s_hash_seed[4]; /* HTREE hash seed */ 503 __u8 s_def_hash_version; /* Default hash version to use */ 504 __u8 s_jnl_backup_type; /* Default type of journal backup */ 505 __u16 s_reserved_word_pad; 506 __u32 s_default_mount_opts; 507 __u32 s_first_meta_bg; /* First metablock group */ 508 __u32 s_mkfs_time; /* When the filesystem was created */ 509 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 510 __u32 s_reserved[172]; /* Padding to the end of the block */ 511}; 512 513/* 514 * Codes for operating systems 515 */ 516#define EXT2_OS_LINUX 0 517#define EXT2_OS_HURD 1 518#define EXT2_OS_MASIX 2 519#define EXT2_OS_FREEBSD 3 520#define EXT2_OS_LITES 4 521 522/* 523 * Revision levels 524 */ 525#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 526#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 527 528#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 529#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 530 531#define EXT2_GOOD_OLD_INODE_SIZE 128 532 533/* 534 * Journal inode backup types 535 */ 536#define EXT3_JNL_BACKUP_BLOCKS 1 537 538/* 539 * Feature set definitions 540 */ 541 542#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 543 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 544#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 545 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 546#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 547 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 548 549#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 550#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 551#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 552#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 553#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 554#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 555 556#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 557#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 558/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 559 560#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 561#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 562#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 563#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 564#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 565#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 566 567 568#define EXT2_FEATURE_COMPAT_SUPP 0 569#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 570#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 571 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 572 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 573 574/* 575 * Default values for user and/or group using reserved blocks 576 */ 577#define EXT2_DEF_RESUID 0 578#define EXT2_DEF_RESGID 0 579 580/* 581 * Default mount options 582 */ 583#define EXT2_DEFM_DEBUG 0x0001 584#define EXT2_DEFM_BSDGROUPS 0x0002 585#define EXT2_DEFM_XATTR_USER 0x0004 586#define EXT2_DEFM_ACL 0x0008 587#define EXT2_DEFM_UID16 0x0010 588#define EXT3_DEFM_JMODE 0x0060 589#define EXT3_DEFM_JMODE_DATA 0x0020 590#define EXT3_DEFM_JMODE_ORDERED 0x0040 591#define EXT3_DEFM_JMODE_WBACK 0x0060 592 593/* 594 * Structure of a directory entry 595 */ 596#define EXT2_NAME_LEN 255 597 598struct ext2_dir_entry { 599 __u32 inode; /* Inode number */ 600 __u16 rec_len; /* Directory entry length */ 601 __u16 name_len; /* Name length */ 602 char name[EXT2_NAME_LEN]; /* File name */ 603}; 604 605/* 606 * The new version of the directory entry. Since EXT2 structures are 607 * stored in intel byte order, and the name_len field could never be 608 * bigger than 255 chars, it's safe to reclaim the extra byte for the 609 * file_type field. 610 */ 611struct ext2_dir_entry_2 { 612 __u32 inode; /* Inode number */ 613 __u16 rec_len; /* Directory entry length */ 614 __u8 name_len; /* Name length */ 615 __u8 file_type; 616 char name[EXT2_NAME_LEN]; /* File name */ 617}; 618 619/* 620 * Ext2 directory file types. Only the low 3 bits are used. The 621 * other bits are reserved for now. 622 */ 623#define EXT2_FT_UNKNOWN 0 624#define EXT2_FT_REG_FILE 1 625#define EXT2_FT_DIR 2 626#define EXT2_FT_CHRDEV 3 627#define EXT2_FT_BLKDEV 4 628#define EXT2_FT_FIFO 5 629#define EXT2_FT_SOCK 6 630#define EXT2_FT_SYMLINK 7 631 632#define EXT2_FT_MAX 8 633 634/* 635 * EXT2_DIR_PAD defines the directory entries boundaries 636 * 637 * NOTE: It must be a multiple of 4 638 */ 639#define EXT2_DIR_PAD 4 640#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 641#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 642 ~EXT2_DIR_ROUND) 643 644#endif /* _LINUX_EXT2_FS_H */ 645