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 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 * Debug code 44 */ 45#ifdef EXT2FS_DEBUG 46# define ext2_debug(f, a...) { \ 47 printk ("EXT2-fs DEBUG (%s, %d): %s:", \ 48 __FILE__, __LINE__, __FUNCTION__); \ 49 printk (f, ## a); \ 50 } 51#else 52# define ext2_debug(f, a...) /**/ 53#endif 54 55/* 56 * Special inode numbers 57 */ 58#define EXT2_BAD_INO 1 /* Bad blocks inode */ 59#define EXT2_ROOT_INO 2 /* Root inode */ 60#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */ 61#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */ 62 63/* First non-reserved inode for old ext2 filesystems */ 64#define EXT2_GOOD_OLD_FIRST_INO 11 65 66/* 67 * The second extended file system magic number 68 */ 69#define EXT2_SUPER_MAGIC 0xEF53 70 71#ifdef __KERNEL__ 72#include <linux/ext2_fs_sb.h> 73static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb) 74{ 75 return sb->s_fs_info; 76} 77#else 78/* Assume that user mode programs are passing in an ext2fs superblock, not 79 * a kernel struct super_block. This will allow us to call the feature-test 80 * macros from user land. */ 81#define EXT2_SB(sb) (sb) 82#endif 83 84/* 85 * Maximal count of links to a file 86 */ 87#define EXT2_LINK_MAX 32000 88 89/* 90 * Macro-instructions used to manage several block sizes 91 */ 92#define EXT2_MIN_BLOCK_SIZE 1024 93#define EXT2_MAX_BLOCK_SIZE 4096 94#define EXT2_MIN_BLOCK_LOG_SIZE 10 95#ifdef __KERNEL__ 96# define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize) 97#else 98# define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size) 99#endif 100#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32)) 101#ifdef __KERNEL__ 102# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) 103#else 104# define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) 105#endif 106#ifdef __KERNEL__ 107#define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits) 108#define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size) 109#define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino) 110#else 111#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 112 EXT2_GOOD_OLD_INODE_SIZE : \ 113 (s)->s_inode_size) 114#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \ 115 EXT2_GOOD_OLD_FIRST_INO : \ 116 (s)->s_first_ino) 117#endif 118 119/* 120 * Macro-instructions used to manage fragments 121 */ 122#define EXT2_MIN_FRAG_SIZE 1024 123#define EXT2_MAX_FRAG_SIZE 4096 124#define EXT2_MIN_FRAG_LOG_SIZE 10 125#ifdef __KERNEL__ 126# define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size) 127# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block) 128#else 129# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size) 130# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s)) 131#endif 132 133/* 134 * Structure of a blocks group descriptor 135 */ 136struct ext2_group_desc 137{ 138 __le32 bg_block_bitmap; /* Blocks bitmap block */ 139 __le32 bg_inode_bitmap; /* Inodes bitmap block */ 140 __le32 bg_inode_table; /* Inodes table block */ 141 __le16 bg_free_blocks_count; /* Free blocks count */ 142 __le16 bg_free_inodes_count; /* Free inodes count */ 143 __le16 bg_used_dirs_count; /* Directories count */ 144 __le16 bg_pad; 145 __le32 bg_reserved[3]; 146}; 147 148/* 149 * Macro-instructions used to manage group descriptors 150 */ 151#ifdef __KERNEL__ 152# define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group) 153# define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block) 154# define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group) 155# define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits) 156#else 157# define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group) 158# define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc)) 159# define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group) 160#endif 161 162/* 163 * Constants relative to the data blocks 164 */ 165#define EXT2_NDIR_BLOCKS 12 166#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS 167#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1) 168#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1) 169#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1) 170 171/* 172 * Inode flags 173 */ 174#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */ 175#define EXT2_UNRM_FL 0x00000002 /* Undelete */ 176#define EXT2_COMPR_FL 0x00000004 /* Compress file */ 177#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */ 178#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */ 179#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */ 180#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */ 181#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */ 182/* Reserved for compression usage... */ 183#define EXT2_DIRTY_FL 0x00000100 184#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */ 185#define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */ 186#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */ 187/* End compression flags --- maybe not all used */ 188#define EXT2_BTREE_FL 0x00001000 /* btree format dir */ 189#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */ 190#define EXT2_IMAGIC_FL 0x00002000 /* AFS directory */ 191#define EXT2_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */ 192#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */ 193#define EXT2_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */ 194#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/ 195#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */ 196 197#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */ 198#define EXT2_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */ 199 200/* 201 * ioctl commands 202 */ 203#define EXT2_IOC_GETFLAGS _IOR('f', 1, long) 204#define EXT2_IOC_SETFLAGS _IOW('f', 2, long) 205#define EXT2_IOC_GETVERSION _IOR('v', 1, long) 206#define EXT2_IOC_SETVERSION _IOW('v', 2, long) 207 208/* 209 * Structure of an inode on the disk 210 */ 211struct ext2_inode { 212 __le16 i_mode; /* File mode */ 213 __le16 i_uid; /* Low 16 bits of Owner Uid */ 214 __le32 i_size; /* Size in bytes */ 215 __le32 i_atime; /* Access time */ 216 __le32 i_ctime; /* Creation time */ 217 __le32 i_mtime; /* Modification time */ 218 __le32 i_dtime; /* Deletion Time */ 219 __le16 i_gid; /* Low 16 bits of Group Id */ 220 __le16 i_links_count; /* Links count */ 221 __le32 i_blocks; /* Blocks count */ 222 __le32 i_flags; /* File flags */ 223 union { 224 struct { 225 __le32 l_i_reserved1; 226 } linux1; 227 struct { 228 __le32 h_i_translator; 229 } hurd1; 230 struct { 231 __le32 m_i_reserved1; 232 } masix1; 233 } osd1; /* OS dependent 1 */ 234 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 235 __le32 i_generation; /* File version (for NFS) */ 236 __le32 i_file_acl; /* File ACL */ 237 __le32 i_dir_acl; /* Directory ACL */ 238 __le32 i_faddr; /* Fragment address */ 239 union { 240 struct { 241 __u8 l_i_frag; /* Fragment number */ 242 __u8 l_i_fsize; /* Fragment size */ 243 __u16 i_pad1; 244 __le16 l_i_uid_high; /* these 2 fields */ 245 __le16 l_i_gid_high; /* were reserved2[0] */ 246 __u32 l_i_reserved2; 247 } linux2; 248 struct { 249 __u8 h_i_frag; /* Fragment number */ 250 __u8 h_i_fsize; /* Fragment size */ 251 __le16 h_i_mode_high; 252 __le16 h_i_uid_high; 253 __le16 h_i_gid_high; 254 __le32 h_i_author; 255 } hurd2; 256 struct { 257 __u8 m_i_frag; /* Fragment number */ 258 __u8 m_i_fsize; /* Fragment size */ 259 __u16 m_pad1; 260 __u32 m_i_reserved2[2]; 261 } masix2; 262 } osd2; /* OS dependent 2 */ 263}; 264 265#define i_size_high i_dir_acl 266 267#if defined(__KERNEL__) || defined(__linux__) 268#define i_reserved1 osd1.linux1.l_i_reserved1 269#define i_frag osd2.linux2.l_i_frag 270#define i_fsize osd2.linux2.l_i_fsize 271#define i_uid_low i_uid 272#define i_gid_low i_gid 273#define i_uid_high osd2.linux2.l_i_uid_high 274#define i_gid_high osd2.linux2.l_i_gid_high 275#define i_reserved2 osd2.linux2.l_i_reserved2 276#endif 277 278#ifdef __hurd__ 279#define i_translator osd1.hurd1.h_i_translator 280#define i_frag osd2.hurd2.h_i_frag; 281#define i_fsize osd2.hurd2.h_i_fsize; 282#define i_uid_high osd2.hurd2.h_i_uid_high 283#define i_gid_high osd2.hurd2.h_i_gid_high 284#define i_author osd2.hurd2.h_i_author 285#endif 286 287#ifdef __masix__ 288#define i_reserved1 osd1.masix1.m_i_reserved1 289#define i_frag osd2.masix2.m_i_frag 290#define i_fsize osd2.masix2.m_i_fsize 291#define i_reserved2 osd2.masix2.m_i_reserved2 292#endif 293 294/* 295 * File system states 296 */ 297#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 298#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 299 300/* 301 * Mount flags 302 */ 303#define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 304#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 305#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 306#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 307#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 308#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 309#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 310#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 311#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 312#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 313#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 314#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 315#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 316#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 317#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 318 319 320#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 321#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 322#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 323 EXT2_MOUNT_##opt) 324/* 325 * Maximal mount counts between two filesystem checks 326 */ 327#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 328#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 329 330/* 331 * Behaviour when detecting errors 332 */ 333#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 334#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 335#define EXT2_ERRORS_PANIC 3 /* Panic */ 336#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 337 338/* 339 * Structure of the super block 340 */ 341struct ext2_super_block { 342 __le32 s_inodes_count; /* Inodes count */ 343 __le32 s_blocks_count; /* Blocks count */ 344 __le32 s_r_blocks_count; /* Reserved blocks count */ 345 __le32 s_free_blocks_count; /* Free blocks count */ 346 __le32 s_free_inodes_count; /* Free inodes count */ 347 __le32 s_first_data_block; /* First Data Block */ 348 __le32 s_log_block_size; /* Block size */ 349 __le32 s_log_frag_size; /* Fragment size */ 350 __le32 s_blocks_per_group; /* # Blocks per group */ 351 __le32 s_frags_per_group; /* # Fragments per group */ 352 __le32 s_inodes_per_group; /* # Inodes per group */ 353 __le32 s_mtime; /* Mount time */ 354 __le32 s_wtime; /* Write time */ 355 __le16 s_mnt_count; /* Mount count */ 356 __le16 s_max_mnt_count; /* Maximal mount count */ 357 __le16 s_magic; /* Magic signature */ 358 __le16 s_state; /* File system state */ 359 __le16 s_errors; /* Behaviour when detecting errors */ 360 __le16 s_minor_rev_level; /* minor revision level */ 361 __le32 s_lastcheck; /* time of last check */ 362 __le32 s_checkinterval; /* max. time between checks */ 363 __le32 s_creator_os; /* OS */ 364 __le32 s_rev_level; /* Revision level */ 365 __le16 s_def_resuid; /* Default uid for reserved blocks */ 366 __le16 s_def_resgid; /* Default gid for reserved blocks */ 367 /* 368 * These fields are for EXT2_DYNAMIC_REV superblocks only. 369 * 370 * Note: the difference between the compatible feature set and 371 * the incompatible feature set is that if there is a bit set 372 * in the incompatible feature set that the kernel doesn't 373 * know about, it should refuse to mount the filesystem. 374 * 375 * e2fsck's requirements are more strict; if it doesn't know 376 * about a feature in either the compatible or incompatible 377 * feature set, it must abort and not try to meddle with 378 * things it doesn't understand... 379 */ 380 __le32 s_first_ino; /* First non-reserved inode */ 381 __le16 s_inode_size; /* size of inode structure */ 382 __le16 s_block_group_nr; /* block group # of this superblock */ 383 __le32 s_feature_compat; /* compatible feature set */ 384 __le32 s_feature_incompat; /* incompatible feature set */ 385 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 386 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 387 char s_volume_name[16]; /* volume name */ 388 char s_last_mounted[64]; /* directory where last mounted */ 389 __le32 s_algorithm_usage_bitmap; /* For compression */ 390 /* 391 * Performance hints. Directory preallocation should only 392 * happen if the EXT2_COMPAT_PREALLOC flag is on. 393 */ 394 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 395 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 396 __u16 s_padding1; 397 /* 398 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 399 */ 400 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 401 __u32 s_journal_inum; /* inode number of journal file */ 402 __u32 s_journal_dev; /* device number of journal file */ 403 __u32 s_last_orphan; /* start of list of inodes to delete */ 404 __u32 s_hash_seed[4]; /* HTREE hash seed */ 405 __u8 s_def_hash_version; /* Default hash version to use */ 406 __u8 s_reserved_char_pad; 407 __u16 s_reserved_word_pad; 408 __le32 s_default_mount_opts; 409 __le32 s_first_meta_bg; /* First metablock block group */ 410 __u32 s_reserved[190]; /* Padding to the end of the block */ 411}; 412 413/* 414 * Codes for operating systems 415 */ 416#define EXT2_OS_LINUX 0 417#define EXT2_OS_HURD 1 418#define EXT2_OS_MASIX 2 419#define EXT2_OS_FREEBSD 3 420#define EXT2_OS_LITES 4 421 422/* 423 * Revision levels 424 */ 425#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 426#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 427 428#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 429#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 430 431#define EXT2_GOOD_OLD_INODE_SIZE 128 432 433/* 434 * Feature set definitions 435 */ 436 437#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 438 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 439#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 440 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 441#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 442 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 443#define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 444 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 445#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 446 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 447#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 448 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 449#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 450 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 451#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 452 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 453#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 454 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 455 456#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 457#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 458#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 459#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 460#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 461#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 462#define EXT2_FEATURE_COMPAT_ANY 0xffffffff 463 464#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 465#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 466#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 467#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 468 469#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 470#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 471#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 472#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 473#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 474#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 475 476#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 477#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 478 EXT2_FEATURE_INCOMPAT_META_BG) 479#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 480 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 481 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 482#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 483#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 484 485/* 486 * Default values for user and/or group using reserved blocks 487 */ 488#define EXT2_DEF_RESUID 0 489#define EXT2_DEF_RESGID 0 490 491/* 492 * Default mount options 493 */ 494#define EXT2_DEFM_DEBUG 0x0001 495#define EXT2_DEFM_BSDGROUPS 0x0002 496#define EXT2_DEFM_XATTR_USER 0x0004 497#define EXT2_DEFM_ACL 0x0008 498#define EXT2_DEFM_UID16 0x0010 499 /* Not used by ext2, but reserved for use by ext3 */ 500#define EXT3_DEFM_JMODE 0x0060 501#define EXT3_DEFM_JMODE_DATA 0x0020 502#define EXT3_DEFM_JMODE_ORDERED 0x0040 503#define EXT3_DEFM_JMODE_WBACK 0x0060 504 505/* 506 * Structure of a directory entry 507 */ 508#define EXT2_NAME_LEN 255 509 510struct ext2_dir_entry { 511 __le32 inode; /* Inode number */ 512 __le16 rec_len; /* Directory entry length */ 513 __le16 name_len; /* Name length */ 514 char name[EXT2_NAME_LEN]; /* File name */ 515}; 516 517/* 518 * The new version of the directory entry. Since EXT2 structures are 519 * stored in intel byte order, and the name_len field could never be 520 * bigger than 255 chars, it's safe to reclaim the extra byte for the 521 * file_type field. 522 */ 523struct ext2_dir_entry_2 { 524 __le32 inode; /* Inode number */ 525 __le16 rec_len; /* Directory entry length */ 526 __u8 name_len; /* Name length */ 527 __u8 file_type; 528 char name[EXT2_NAME_LEN]; /* File name */ 529}; 530 531/* 532 * Ext2 directory file types. Only the low 3 bits are used. The 533 * other bits are reserved for now. 534 */ 535enum { 536 EXT2_FT_UNKNOWN, 537 EXT2_FT_REG_FILE, 538 EXT2_FT_DIR, 539 EXT2_FT_CHRDEV, 540 EXT2_FT_BLKDEV, 541 EXT2_FT_FIFO, 542 EXT2_FT_SOCK, 543 EXT2_FT_SYMLINK, 544 EXT2_FT_MAX 545}; 546 547/* 548 * EXT2_DIR_PAD defines the directory entries boundaries 549 * 550 * NOTE: It must be a multiple of 4 551 */ 552#define EXT2_DIR_PAD 4 553#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 554#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 555 ~EXT2_DIR_ROUND) 556 557#endif /* _LINUX_EXT2_FS_H */ 558