ext2_fs.h revision 8fe81a3d53fbaa1670ece5fb7fd11dd5ae45b8da
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_flags; 147 __u32 bg_reserved[3]; 148}; 149 150#define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */ 151#define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */ 152 153/* 154 * Data structures used by the directory indexing feature 155 * 156 * Note: all of the multibyte integer fields are little endian. 157 */ 158 159/* 160 * Note: dx_root_info is laid out so that if it should somehow get 161 * overlaid by a dirent the two low bits of the hash version will be 162 * zero. Therefore, the hash version mod 4 should never be 0. 163 * Sincerely, the paranoia department. 164 */ 165struct ext2_dx_root_info { 166 __u32 reserved_zero; 167 __u8 hash_version; /* 0 now, 1 at release */ 168 __u8 info_length; /* 8 */ 169 __u8 indirect_levels; 170 __u8 unused_flags; 171}; 172 173#define EXT2_HASH_LEGACY 0 174#define EXT2_HASH_HALF_MD4 1 175#define EXT2_HASH_TEA 2 176 177#define EXT2_HASH_FLAG_INCOMPAT 0x1 178 179struct ext2_dx_entry { 180 __u32 hash; 181 __u32 block; 182}; 183 184struct ext2_dx_countlimit { 185 __u16 limit; 186 __u16 count; 187}; 188 189 190/* 191 * Macro-instructions used to manage group descriptors 192 */ 193#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 194#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 195#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s)) 196/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */ 197#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8) 198#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s)) 199#ifdef __KERNEL__ 200#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 201#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 202#else 203#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 204#endif 205 206/* 207 * Constants relative to the data blocks 208 */ 209#define EXT2_NDIR_BLOCKS 12 210#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 211#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 212#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 213#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 214 215/* 216 * Inode flags 217 */ 218#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 219#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 220#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 221#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 222#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 223#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 224#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 225#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 226/* Reserved for compression usage... */ 227#define EXT2_DIRTY_FL 0x00000100 228#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 229#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */ 230#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 231/* End compression flags --- maybe not all used */ 232#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 233#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 234#define EXT2_IMAGIC_FL 0x00002000 235#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */ 236#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 237#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */ 238#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 239#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */ 240#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 241 242#define EXT2_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */ 243#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */ 244 245/* 246 * ioctl commands 247 */ 248 249/* Used for online resize */ 250struct ext2_new_group_input { 251 __u32 group; /* Group number for this data */ 252 __u32 block_bitmap; /* Absolute block number of block bitmap */ 253 __u32 inode_bitmap; /* Absolute block number of inode bitmap */ 254 __u32 inode_table; /* Absolute block number of inode table start */ 255 __u32 blocks_count; /* Total number of blocks in this group */ 256 __u16 reserved_blocks; /* Number of reserved blocks in this group */ 257 __u16 unused; /* Number of reserved GDT blocks in group */ 258}; 259 260#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 261#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 262#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 263#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 264#define EXT2_IOC_GETVERSION_NEW _IOR('f', 3, long) 265#define EXT2_IOC_SETVERSION_NEW _IOW('f', 4, long) 266#define EXT2_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long) 267#define EXT2_IOC_GROUP_ADD _IOW('f', 8,struct ext2_new_group_input) 268 269/* 270 * Structure of an inode on the disk 271 */ 272struct ext2_inode { 273 __u16 i_mode; /* File mode */ 274 __u16 i_uid; /* Low 16 bits of Owner Uid */ 275 __u32 i_size; /* Size in bytes */ 276 __u32 i_atime; /* Access time */ 277 __u32 i_ctime; /* Creation time */ 278 __u32 i_mtime; /* Modification time */ 279 __u32 i_dtime; /* Deletion Time */ 280 __u16 i_gid; /* Low 16 bits of Group Id */ 281 __u16 i_links_count; /* Links count */ 282 __u32 i_blocks; /* Blocks count */ 283 __u32 i_flags; /* File flags */ 284 union { 285 struct { 286 __u32 l_i_reserved1; 287 } linux1; 288 struct { 289 __u32 h_i_translator; 290 } hurd1; 291 struct { 292 __u32 m_i_reserved1; 293 } masix1; 294 } osd1; /* OS dependent 1 */ 295 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 296 __u32 i_generation; /* File version (for NFS) */ 297 __u32 i_file_acl; /* File ACL */ 298 __u32 i_dir_acl; /* Directory ACL */ 299 __u32 i_faddr; /* Fragment address */ 300 union { 301 struct { 302 __u8 l_i_frag; /* Fragment number */ 303 __u8 l_i_fsize; /* Fragment size */ 304 __u16 i_pad1; 305 __u16 l_i_uid_high; /* these 2 fields */ 306 __u16 l_i_gid_high; /* were reserved2[0] */ 307 __u32 l_i_reserved2; 308 } linux2; 309 struct { 310 __u8 h_i_frag; /* Fragment number */ 311 __u8 h_i_fsize; /* Fragment size */ 312 __u16 h_i_mode_high; 313 __u16 h_i_uid_high; 314 __u16 h_i_gid_high; 315 __u32 h_i_author; 316 } hurd2; 317 struct { 318 __u8 m_i_frag; /* Fragment number */ 319 __u8 m_i_fsize; /* Fragment size */ 320 __u16 m_pad1; 321 __u32 m_i_reserved2[2]; 322 } masix2; 323 } osd2; /* OS dependent 2 */ 324}; 325 326/* 327 * Permanent part of an large inode on the disk 328 */ 329struct ext2_inode_large { 330 __u16 i_mode; /* File mode */ 331 __u16 i_uid; /* Low 16 bits of Owner Uid */ 332 __u32 i_size; /* Size in bytes */ 333 __u32 i_atime; /* Access time */ 334 __u32 i_ctime; /* Creation time */ 335 __u32 i_mtime; /* Modification time */ 336 __u32 i_dtime; /* Deletion Time */ 337 __u16 i_gid; /* Low 16 bits of Group Id */ 338 __u16 i_links_count; /* Links count */ 339 __u32 i_blocks; /* Blocks count */ 340 __u32 i_flags; /* File flags */ 341 union { 342 struct { 343 __u32 l_i_reserved1; 344 } linux1; 345 struct { 346 __u32 h_i_translator; 347 } hurd1; 348 struct { 349 __u32 m_i_reserved1; 350 } masix1; 351 } osd1; /* OS dependent 1 */ 352 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 353 __u32 i_generation; /* File version (for NFS) */ 354 __u32 i_file_acl; /* File ACL */ 355 __u32 i_dir_acl; /* Directory ACL */ 356 __u32 i_faddr; /* Fragment address */ 357 union { 358 struct { 359 __u8 l_i_frag; /* Fragment number */ 360 __u8 l_i_fsize; /* Fragment size */ 361 __u16 i_pad1; 362 __u16 l_i_uid_high; /* these 2 fields */ 363 __u16 l_i_gid_high; /* were reserved2[0] */ 364 __u32 l_i_reserved2; 365 } linux2; 366 struct { 367 __u8 h_i_frag; /* Fragment number */ 368 __u8 h_i_fsize; /* Fragment size */ 369 __u16 h_i_mode_high; 370 __u16 h_i_uid_high; 371 __u16 h_i_gid_high; 372 __u32 h_i_author; 373 } hurd2; 374 struct { 375 __u8 m_i_frag; /* Fragment number */ 376 __u8 m_i_fsize; /* Fragment size */ 377 __u16 m_pad1; 378 __u32 m_i_reserved2[2]; 379 } masix2; 380 } osd2; /* OS dependent 2 */ 381 __u16 i_extra_isize; 382 __u16 i_pad1; 383}; 384 385#define i_size_high i_dir_acl 386 387#if defined(__KERNEL__) || defined(__linux__) 388#define i_reserved1 osd1.linux1.l_i_reserved1 389#define i_frag osd2.linux2.l_i_frag 390#define i_fsize osd2.linux2.l_i_fsize 391#define i_uid_low i_uid 392#define i_gid_low i_gid 393#define i_uid_high osd2.linux2.l_i_uid_high 394#define i_gid_high osd2.linux2.l_i_gid_high 395#define i_reserved2 osd2.linux2.l_i_reserved2 396 397#else 398#if defined(__GNU__) 399 400#define i_translator osd1.hurd1.h_i_translator 401#define i_frag osd2.hurd2.h_i_frag; 402#define i_fsize osd2.hurd2.h_i_fsize; 403#define i_uid_high osd2.hurd2.h_i_uid_high 404#define i_gid_high osd2.hurd2.h_i_gid_high 405#define i_author osd2.hurd2.h_i_author 406 407#else 408#if defined(__masix__) 409 410#define i_reserved1 osd1.masix1.m_i_reserved1 411#define i_frag osd2.masix2.m_i_frag 412#define i_fsize osd2.masix2.m_i_fsize 413#define i_reserved2 osd2.masix2.m_i_reserved2 414 415#endif /* __masix__ */ 416#endif /* __GNU__ */ 417#endif /* defined(__KERNEL__) || defined(__linux__) */ 418 419/* 420 * File system states 421 */ 422#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 423#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 424 425/* 426 * Mount flags 427 */ 428#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */ 429#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */ 430#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */ 431#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ 432#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ 433#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ 434#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */ 435#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */ 436 437#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 438#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 439#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 440 EXT2_MOUNT_##opt) 441/* 442 * Maximal mount counts between two filesystem checks 443 */ 444#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 445#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 446 447/* 448 * Behaviour when detecting errors 449 */ 450#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 451#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 452#define EXT2_ERRORS_PANIC 3 /* Panic */ 453#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 454 455/* 456 * Structure of the super block 457 */ 458struct ext2_super_block { 459 __u32 s_inodes_count; /* Inodes count */ 460 __u32 s_blocks_count; /* Blocks count */ 461 __u32 s_r_blocks_count; /* Reserved blocks count */ 462 __u32 s_free_blocks_count; /* Free blocks count */ 463 __u32 s_free_inodes_count; /* Free inodes count */ 464 __u32 s_first_data_block; /* First Data Block */ 465 __u32 s_log_block_size; /* Block size */ 466 __s32 s_log_frag_size; /* Fragment size */ 467 __u32 s_blocks_per_group; /* # Blocks per group */ 468 __u32 s_frags_per_group; /* # Fragments per group */ 469 __u32 s_inodes_per_group; /* # Inodes per group */ 470 __u32 s_mtime; /* Mount time */ 471 __u32 s_wtime; /* Write time */ 472 __u16 s_mnt_count; /* Mount count */ 473 __s16 s_max_mnt_count; /* Maximal mount count */ 474 __u16 s_magic; /* Magic signature */ 475 __u16 s_state; /* File system state */ 476 __u16 s_errors; /* Behaviour when detecting errors */ 477 __u16 s_minor_rev_level; /* minor revision level */ 478 __u32 s_lastcheck; /* time of last check */ 479 __u32 s_checkinterval; /* max. time between checks */ 480 __u32 s_creator_os; /* OS */ 481 __u32 s_rev_level; /* Revision level */ 482 __u16 s_def_resuid; /* Default uid for reserved blocks */ 483 __u16 s_def_resgid; /* Default gid for reserved blocks */ 484 /* 485 * These fields are for EXT2_DYNAMIC_REV superblocks only. 486 * 487 * Note: the difference between the compatible feature set and 488 * the incompatible feature set is that if there is a bit set 489 * in the incompatible feature set that the kernel doesn't 490 * know about, it should refuse to mount the filesystem. 491 * 492 * e2fsck's requirements are more strict; if it doesn't know 493 * about a feature in either the compatible or incompatible 494 * feature set, it must abort and not try to meddle with 495 * things it doesn't understand... 496 */ 497 __u32 s_first_ino; /* First non-reserved inode */ 498 __u16 s_inode_size; /* size of inode structure */ 499 __u16 s_block_group_nr; /* block group # of this superblock */ 500 __u32 s_feature_compat; /* compatible feature set */ 501 __u32 s_feature_incompat; /* incompatible feature set */ 502 __u32 s_feature_ro_compat; /* readonly-compatible feature set */ 503 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 504 char s_volume_name[16]; /* volume name */ 505 char s_last_mounted[64]; /* directory where last mounted */ 506 __u32 s_algorithm_usage_bitmap; /* For compression */ 507 /* 508 * Performance hints. Directory preallocation should only 509 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on. 510 */ 511 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 512 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 513 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */ 514 /* 515 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set. 516 */ 517 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 518 __u32 s_journal_inum; /* inode number of journal file */ 519 __u32 s_journal_dev; /* device number of journal file */ 520 __u32 s_last_orphan; /* start of list of inodes to delete */ 521 __u32 s_hash_seed[4]; /* HTREE hash seed */ 522 __u8 s_def_hash_version; /* Default hash version to use */ 523 __u8 s_jnl_backup_type; /* Default type of journal backup */ 524 __u16 s_reserved_word_pad; 525 __u32 s_default_mount_opts; 526 __u32 s_first_meta_bg; /* First metablock group */ 527 __u32 s_mkfs_time; /* When the filesystem was created */ 528 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */ 529 __u32 s_reserved[172]; /* Padding to the end of the block */ 530}; 531 532/* 533 * Codes for operating systems 534 */ 535#define EXT2_OS_LINUX 0 536#define EXT2_OS_HURD 1 537#define EXT2_OS_MASIX 2 538#define EXT2_OS_FREEBSD 3 539#define EXT2_OS_LITES 4 540 541/* 542 * Revision levels 543 */ 544#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 545#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 546 547#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 548#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 549 550#define EXT2_GOOD_OLD_INODE_SIZE 128 551 552/* 553 * Journal inode backup types 554 */ 555#define EXT3_JNL_BACKUP_BLOCKS 1 556 557/* 558 * Feature set definitions 559 */ 560 561#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 562 ( EXT2_SB(sb)->s_feature_compat & (mask) ) 563#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 564 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) ) 565#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 566 ( EXT2_SB(sb)->s_feature_incompat & (mask) ) 567 568#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 569#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 570#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 571#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 572#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010 573#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 574#define EXT2_FEATURE_COMPAT_LAZY_BG 0x0040 575 576#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 577#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 578/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */ 579 580#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 581#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 582#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */ 583#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */ 584#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 585#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040 586 587 588#define EXT2_FEATURE_COMPAT_SUPP 0 589#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE) 590#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 591 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 592 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 593 594/* 595 * Default values for user and/or group using reserved blocks 596 */ 597#define EXT2_DEF_RESUID 0 598#define EXT2_DEF_RESGID 0 599 600/* 601 * Default mount options 602 */ 603#define EXT2_DEFM_DEBUG 0x0001 604#define EXT2_DEFM_BSDGROUPS 0x0002 605#define EXT2_DEFM_XATTR_USER 0x0004 606#define EXT2_DEFM_ACL 0x0008 607#define EXT2_DEFM_UID16 0x0010 608#define EXT3_DEFM_JMODE 0x0060 609#define EXT3_DEFM_JMODE_DATA 0x0020 610#define EXT3_DEFM_JMODE_ORDERED 0x0040 611#define EXT3_DEFM_JMODE_WBACK 0x0060 612 613/* 614 * Structure of a directory entry 615 */ 616#define EXT2_NAME_LEN 255 617 618struct ext2_dir_entry { 619 __u32 inode; /* Inode number */ 620 __u16 rec_len; /* Directory entry length */ 621 __u16 name_len; /* Name length */ 622 char name[EXT2_NAME_LEN]; /* File name */ 623}; 624 625/* 626 * The new version of the directory entry. Since EXT2 structures are 627 * stored in intel byte order, and the name_len field could never be 628 * bigger than 255 chars, it's safe to reclaim the extra byte for the 629 * file_type field. 630 */ 631struct ext2_dir_entry_2 { 632 __u32 inode; /* Inode number */ 633 __u16 rec_len; /* Directory entry length */ 634 __u8 name_len; /* Name length */ 635 __u8 file_type; 636 char name[EXT2_NAME_LEN]; /* File name */ 637}; 638 639/* 640 * Ext2 directory file types. Only the low 3 bits are used. The 641 * other bits are reserved for now. 642 */ 643#define EXT2_FT_UNKNOWN 0 644#define EXT2_FT_REG_FILE 1 645#define EXT2_FT_DIR 2 646#define EXT2_FT_CHRDEV 3 647#define EXT2_FT_BLKDEV 4 648#define EXT2_FT_FIFO 5 649#define EXT2_FT_SOCK 6 650#define EXT2_FT_SYMLINK 7 651 652#define EXT2_FT_MAX 8 653 654/* 655 * EXT2_DIR_PAD defines the directory entries boundaries 656 * 657 * NOTE: It must be a multiple of 4 658 */ 659#define EXT2_DIR_PAD 4 660#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 661#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 662 ~EXT2_DIR_ROUND) 663 664#endif /* _LINUX_EXT2_FS_H */ 665