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 <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/* Assume that user mode programs are passing in an ext2fs superblock, not 69 * a kernel struct super_block. This will allow us to call the feature-test 70 * macros from user land. */ 71#define EXT2_SB(sb) (sb) 72 73/* 74 * Maximal count of links to a file 75 */ 76#define EXT2_LINK_MAX 32000 77 78/* 79 * Macro-instructions used to manage several block sizes 80 */ 81#define EXT2_MIN_BLOCK_SIZE 1024 82#define EXT2_MAX_BLOCK_SIZE 4096 83#define EXT2_MIN_BLOCK_LOG_SIZE 10 84# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 85#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 86# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 87#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 88 EXT2_GOOD_OLD_INODE_SIZE : \ 89 (s)->s_inode_size) 90#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 91 EXT2_GOOD_OLD_FIRST_INO : \ 92 (s)->s_first_ino) 93 94/* 95 * Macro-instructions used to manage fragments 96 */ 97#define EXT2_MIN_FRAG_SIZE 1024 98#define EXT2_MAX_FRAG_SIZE 4096 99#define EXT2_MIN_FRAG_LOG_SIZE 10 100# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 101# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 102 103/* 104 * Structure of a blocks group descriptor 105 */ 106struct ext2_group_desc 107{ 108 __le32 bg_block_bitmap; /* Blocks bitmap block */ 109 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 110 __le32 bg_inode_table; /* Inodes table block */ 111 __le16 bg_free_blocks_count; /* Free blocks count */ 112 __le16 bg_free_inodes_count; /* Free inodes count */ 113 __le16 bg_used_dirs_count; /* Directories count */ 114 __le16 bg_pad; 115 __le32 bg_reserved[3]; 116}; 117 118/* 119 * Macro-instructions used to manage group descriptors 120 */ 121# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 122# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 123# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 124 125/* 126 * Constants relative to the data blocks 127 */ 128#define EXT2_NDIR_BLOCKS 12 129#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 130#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 131#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 132#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 133 134/* 135 * Inode flags (GETFLAGS/SETFLAGS) 136 */ 137#define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */ 138#define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */ 139#define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */ 140#define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */ 141#define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */ 142#define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */ 143#define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */ 144#define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */ 145/* Reserved for compression usage... */ 146#define EXT2_DIRTY_FL FS_DIRTY_FL 147#define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */ 148#define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */ 149#define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */ 150/* End compression flags --- maybe not all used */ 151#define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */ 152#define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */ 153#define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */ 154#define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */ 155#define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */ 156#define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */ 157#define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/ 158#define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */ 159 160#define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */ 161#define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */ 162 163/* Flags that should be inherited by new inodes from their parent. */ 164#define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 165 EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\ 166 EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\ 167 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 168 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 169 170/* Flags that are appropriate for regular files (all but dir-specific ones). */ 171#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 172 173/* Flags that are appropriate for non-directories/regular files. */ 174#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 175 176/* Mask out flags that are inappropriate for the given type of inode. */ 177static __inline__ __u32 ext2_mask_flags(umode_t mode, __u32 flags) 178{ 179 if (S_ISDIR(mode)) 180 return flags; 181 else if (S_ISREG(mode)) 182 return flags & EXT2_REG_FLMASK; 183 else 184 return flags & EXT2_OTHER_FLMASK; 185} 186 187/* 188 * ioctl commands 189 */ 190#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 191#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 192#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 193#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 194#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 195#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 196 197/* 198 * ioctl commands in 32 bit emulation 199 */ 200#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 201#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 202#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 203#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 204 205/* 206 * Structure of an inode on the disk 207 */ 208struct ext2_inode { 209 __le16 i_mode; /* File mode */ 210 __le16 i_uid; /* Low 16 bits of Owner Uid */ 211 __le32 i_size; /* Size in bytes */ 212 __le32 i_atime; /* Access time */ 213 __le32 i_ctime; /* Creation time */ 214 __le32 i_mtime; /* Modification time */ 215 __le32 i_dtime; /* Deletion Time */ 216 __le16 i_gid; /* Low 16 bits of Group Id */ 217 __le16 i_links_count; /* Links count */ 218 __le32 i_blocks; /* Blocks count */ 219 __le32 i_flags; /* File flags */ 220 union { 221 struct { 222 __le32 l_i_reserved1; 223 } linux1; 224 struct { 225 __le32 h_i_translator; 226 } hurd1; 227 struct { 228 __le32 m_i_reserved1; 229 } masix1; 230 } osd1; /* OS dependent 1 */ 231 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 232 __le32 i_generation; /* File version (for NFS) */ 233 __le32 i_file_acl; /* File ACL */ 234 __le32 i_dir_acl; /* Directory ACL */ 235 __le32 i_faddr; /* Fragment address */ 236 union { 237 struct { 238 __u8 l_i_frag; /* Fragment number */ 239 __u8 l_i_fsize; /* Fragment size */ 240 __u16 i_pad1; 241 __le16 l_i_uid_high; /* these 2 fields */ 242 __le16 l_i_gid_high; /* were reserved2[0] */ 243 __u32 l_i_reserved2; 244 } linux2; 245 struct { 246 __u8 h_i_frag; /* Fragment number */ 247 __u8 h_i_fsize; /* Fragment size */ 248 __le16 h_i_mode_high; 249 __le16 h_i_uid_high; 250 __le16 h_i_gid_high; 251 __le32 h_i_author; 252 } hurd2; 253 struct { 254 __u8 m_i_frag; /* Fragment number */ 255 __u8 m_i_fsize; /* Fragment size */ 256 __u16 m_pad1; 257 __u32 m_i_reserved2[2]; 258 } masix2; 259 } osd2; /* OS dependent 2 */ 260}; 261 262#define i_size_high i_dir_acl 263 264#if defined(__KERNEL__) || defined(__linux__) 265#define i_reserved1 osd1.linux1.l_i_reserved1 266#define i_frag osd2.linux2.l_i_frag 267#define i_fsize osd2.linux2.l_i_fsize 268#define i_uid_low i_uid 269#define i_gid_low i_gid 270#define i_uid_high osd2.linux2.l_i_uid_high 271#define i_gid_high osd2.linux2.l_i_gid_high 272#define i_reserved2 osd2.linux2.l_i_reserved2 273#endif 274 275#ifdef __hurd__ 276#define i_translator osd1.hurd1.h_i_translator 277#define i_frag osd2.hurd2.h_i_frag 278#define i_fsize osd2.hurd2.h_i_fsize 279#define i_uid_high osd2.hurd2.h_i_uid_high 280#define i_gid_high osd2.hurd2.h_i_gid_high 281#define i_author osd2.hurd2.h_i_author 282#endif 283 284#ifdef __masix__ 285#define i_reserved1 osd1.masix1.m_i_reserved1 286#define i_frag osd2.masix2.m_i_frag 287#define i_fsize osd2.masix2.m_i_fsize 288#define i_reserved2 osd2.masix2.m_i_reserved2 289#endif 290 291/* 292 * File system states 293 */ 294#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 295#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 296 297/* 298 * Mount flags 299 */ 300#define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 301#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 302#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 303#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 304#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 305#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 306#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 307#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 308#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 309#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 310#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 311#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 312#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 313#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 314#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 315#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 316 317 318#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 319#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 320#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 321 EXT2_MOUNT_##opt) 322/* 323 * Maximal mount counts between two filesystem checks 324 */ 325#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 326#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 327 328/* 329 * Behaviour when detecting errors 330 */ 331#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 332#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 333#define EXT2_ERRORS_PANIC 3 /* Panic */ 334#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 335 336/* 337 * Structure of the super block 338 */ 339struct ext2_super_block { 340 __le32 s_inodes_count; /* Inodes count */ 341 __le32 s_blocks_count; /* Blocks count */ 342 __le32 s_r_blocks_count; /* Reserved blocks count */ 343 __le32 s_free_blocks_count; /* Free blocks count */ 344 __le32 s_free_inodes_count; /* Free inodes count */ 345 __le32 s_first_data_block; /* First Data Block */ 346 __le32 s_log_block_size; /* Block size */ 347 __le32 s_log_frag_size; /* Fragment size */ 348 __le32 s_blocks_per_group; /* # Blocks per group */ 349 __le32 s_frags_per_group; /* # Fragments per group */ 350 __le32 s_inodes_per_group; /* # Inodes per group */ 351 __le32 s_mtime; /* Mount time */ 352 __le32 s_wtime; /* Write time */ 353 __le16 s_mnt_count; /* Mount count */ 354 __le16 s_max_mnt_count; /* Maximal mount count */ 355 __le16 s_magic; /* Magic signature */ 356 __le16 s_state; /* File system state */ 357 __le16 s_errors; /* Behaviour when detecting errors */ 358 __le16 s_minor_rev_level; /* minor revision level */ 359 __le32 s_lastcheck; /* time of last check */ 360 __le32 s_checkinterval; /* max. time between checks */ 361 __le32 s_creator_os; /* OS */ 362 __le32 s_rev_level; /* Revision level */ 363 __le16 s_def_resuid; /* Default uid for reserved blocks */ 364 __le16 s_def_resgid; /* Default gid for reserved blocks */ 365 /* 366 * These fields are for EXT2_DYNAMIC_REV superblocks only. 367 * 368 * Note: the difference between the compatible feature set and 369 * the incompatible feature set is that if there is a bit set 370 * in the incompatible feature set that the kernel doesn't 371 * know about, it should refuse to mount the filesystem. 372 * 373 * e2fsck's requirements are more strict; if it doesn't know 374 * about a feature in either the compatible or incompatible 375 * feature set, it must abort and not try to meddle with 376 * things it doesn't understand... 377 */ 378 __le32 s_first_ino; /* First non-reserved inode */ 379 __le16 s_inode_size; /* size of inode structure */ 380 __le16 s_block_group_nr; /* block group # of this superblock */ 381 __le32 s_feature_compat; /* compatible feature set */ 382 __le32 s_feature_incompat; /* incompatible feature set */ 383 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 384 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 385 char s_volume_name[16]; /* volume name */ 386 char s_last_mounted[64]; /* directory where last mounted */ 387 __le32 s_algorithm_usage_bitmap; /* For compression */ 388 /* 389 * Performance hints. Directory preallocation should only 390 * happen if the EXT2_COMPAT_PREALLOC flag is on. 391 */ 392 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 393 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 394 __u16 s_padding1; 395 /* 396 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 397 */ 398 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 399 __u32 s_journal_inum; /* inode number of journal file */ 400 __u32 s_journal_dev; /* device number of journal file */ 401 __u32 s_last_orphan; /* start of list of inodes to delete */ 402 __u32 s_hash_seed[4]; /* HTREE hash seed */ 403 __u8 s_def_hash_version; /* Default hash version to use */ 404 __u8 s_reserved_char_pad; 405 __u16 s_reserved_word_pad; 406 __le32 s_default_mount_opts; 407 __le32 s_first_meta_bg; /* First metablock block group */ 408 __u32 s_reserved[190]; /* Padding to the end of the block */ 409}; 410 411/* 412 * Codes for operating systems 413 */ 414#define EXT2_OS_LINUX 0 415#define EXT2_OS_HURD 1 416#define EXT2_OS_MASIX 2 417#define EXT2_OS_FREEBSD 3 418#define EXT2_OS_LITES 4 419 420/* 421 * Revision levels 422 */ 423#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 424#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 425 426#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 427#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 428 429#define EXT2_GOOD_OLD_INODE_SIZE 128 430 431/* 432 * Feature set definitions 433 */ 434 435#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 436 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 437#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 438 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 439#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 440 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 441#define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 442 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 443#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 444 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 445#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 446 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 447#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 448 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 449#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 450 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 451#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 452 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 453 454#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 455#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 456#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 457#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 458#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 459#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 460#define EXT2_FEATURE_COMPAT_ANY 0xffffffff 461 462#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 463#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 464#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 465#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 466 467#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 468#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 469#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 470#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 471#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 472#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 473 474#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 475#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 476 EXT2_FEATURE_INCOMPAT_META_BG) 477#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 478 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 479 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 480#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 481#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 482 483/* 484 * Default values for user and/or group using reserved blocks 485 */ 486#define EXT2_DEF_RESUID 0 487#define EXT2_DEF_RESGID 0 488 489/* 490 * Default mount options 491 */ 492#define EXT2_DEFM_DEBUG 0x0001 493#define EXT2_DEFM_BSDGROUPS 0x0002 494#define EXT2_DEFM_XATTR_USER 0x0004 495#define EXT2_DEFM_ACL 0x0008 496#define EXT2_DEFM_UID16 0x0010 497 /* Not used by ext2, but reserved for use by ext3 */ 498#define EXT3_DEFM_JMODE 0x0060 499#define EXT3_DEFM_JMODE_DATA 0x0020 500#define EXT3_DEFM_JMODE_ORDERED 0x0040 501#define EXT3_DEFM_JMODE_WBACK 0x0060 502 503/* 504 * Structure of a directory entry 505 */ 506#define EXT2_NAME_LEN 255 507 508struct ext2_dir_entry { 509 __le32 inode; /* Inode number */ 510 __le16 rec_len; /* Directory entry length */ 511 __le16 name_len; /* Name length */ 512 char name[EXT2_NAME_LEN]; /* File name */ 513}; 514 515/* 516 * The new version of the directory entry. Since EXT2 structures are 517 * stored in intel byte order, and the name_len field could never be 518 * bigger than 255 chars, it's safe to reclaim the extra byte for the 519 * file_type field. 520 */ 521struct ext2_dir_entry_2 { 522 __le32 inode; /* Inode number */ 523 __le16 rec_len; /* Directory entry length */ 524 __u8 name_len; /* Name length */ 525 __u8 file_type; 526 char name[EXT2_NAME_LEN]; /* File name */ 527}; 528 529/* 530 * Ext2 directory file types. Only the low 3 bits are used. The 531 * other bits are reserved for now. 532 */ 533enum { 534 EXT2_FT_UNKNOWN = 0, 535 EXT2_FT_REG_FILE = 1, 536 EXT2_FT_DIR = 2, 537 EXT2_FT_CHRDEV = 3, 538 EXT2_FT_BLKDEV = 4, 539 EXT2_FT_FIFO = 5, 540 EXT2_FT_SOCK = 6, 541 EXT2_FT_SYMLINK = 7, 542 EXT2_FT_MAX 543}; 544 545/* 546 * EXT2_DIR_PAD defines the directory entries boundaries 547 * 548 * NOTE: It must be a multiple of 4 549 */ 550#define EXT2_DIR_PAD 4 551#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 552#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 553 ~EXT2_DIR_ROUND) 554#define EXT2_MAX_REC_LEN ((1<<16)-1) 555 556#endif /* _LINUX_EXT2_FS_H */ 557