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#ifdef __KERNEL__ 69#include <linux/ext2_fs_sb.h> 70static 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 */ 133struct 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/* Flags that should be inherited by new inodes from their parent. */ 198#define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\ 199 EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\ 200 EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\ 201 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\ 202 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL) 203 204/* Flags that are appropriate for regular files (all but dir-specific ones). */ 205#define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL)) 206 207/* Flags that are appropriate for non-directories/regular files. */ 208#define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL) 209 210/* Mask out flags that are inappropriate for the given type of inode. */ 211static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags) 212{ 213 if (S_ISDIR(mode)) 214 return flags; 215 else if (S_ISREG(mode)) 216 return flags & EXT2_REG_FLMASK; 217 else 218 return flags & EXT2_OTHER_FLMASK; 219} 220 221/* 222 * ioctl commands 223 */ 224#define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS 225#define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS 226#define EXT2_IOC_GETVERSION FS_IOC_GETVERSION 227#define EXT2_IOC_SETVERSION FS_IOC_SETVERSION 228#define EXT2_IOC_GETRSVSZ _IOR('f', 5, long) 229#define EXT2_IOC_SETRSVSZ _IOW('f', 6, long) 230 231/* 232 * ioctl commands in 32 bit emulation 233 */ 234#define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS 235#define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS 236#define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION 237#define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION 238 239/* 240 * Structure of an inode on the disk 241 */ 242struct ext2_inode { 243 __le16 i_mode; /* File mode */ 244 __le16 i_uid; /* Low 16 bits of Owner Uid */ 245 __le32 i_size; /* Size in bytes */ 246 __le32 i_atime; /* Access time */ 247 __le32 i_ctime; /* Creation time */ 248 __le32 i_mtime; /* Modification time */ 249 __le32 i_dtime; /* Deletion Time */ 250 __le16 i_gid; /* Low 16 bits of Group Id */ 251 __le16 i_links_count; /* Links count */ 252 __le32 i_blocks; /* Blocks count */ 253 __le32 i_flags; /* File flags */ 254 union { 255 struct { 256 __le32 l_i_reserved1; 257 } linux1; 258 struct { 259 __le32 h_i_translator; 260 } hurd1; 261 struct { 262 __le32 m_i_reserved1; 263 } masix1; 264 } osd1; /* OS dependent 1 */ 265 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */ 266 __le32 i_generation; /* File version (for NFS) */ 267 __le32 i_file_acl; /* File ACL */ 268 __le32 i_dir_acl; /* Directory ACL */ 269 __le32 i_faddr; /* Fragment address */ 270 union { 271 struct { 272 __u8 l_i_frag; /* Fragment number */ 273 __u8 l_i_fsize; /* Fragment size */ 274 __u16 i_pad1; 275 __le16 l_i_uid_high; /* these 2 fields */ 276 __le16 l_i_gid_high; /* were reserved2[0] */ 277 __u32 l_i_reserved2; 278 } linux2; 279 struct { 280 __u8 h_i_frag; /* Fragment number */ 281 __u8 h_i_fsize; /* Fragment size */ 282 __le16 h_i_mode_high; 283 __le16 h_i_uid_high; 284 __le16 h_i_gid_high; 285 __le32 h_i_author; 286 } hurd2; 287 struct { 288 __u8 m_i_frag; /* Fragment number */ 289 __u8 m_i_fsize; /* Fragment size */ 290 __u16 m_pad1; 291 __u32 m_i_reserved2[2]; 292 } masix2; 293 } osd2; /* OS dependent 2 */ 294}; 295 296#define i_size_high i_dir_acl 297 298#if defined(__KERNEL__) || defined(__linux__) 299#define i_reserved1 osd1.linux1.l_i_reserved1 300#define i_frag osd2.linux2.l_i_frag 301#define i_fsize osd2.linux2.l_i_fsize 302#define i_uid_low i_uid 303#define i_gid_low i_gid 304#define i_uid_high osd2.linux2.l_i_uid_high 305#define i_gid_high osd2.linux2.l_i_gid_high 306#define i_reserved2 osd2.linux2.l_i_reserved2 307#endif 308 309#ifdef __hurd__ 310#define i_translator osd1.hurd1.h_i_translator 311#define i_frag osd2.hurd2.h_i_frag 312#define i_fsize osd2.hurd2.h_i_fsize 313#define i_uid_high osd2.hurd2.h_i_uid_high 314#define i_gid_high osd2.hurd2.h_i_gid_high 315#define i_author osd2.hurd2.h_i_author 316#endif 317 318#ifdef __masix__ 319#define i_reserved1 osd1.masix1.m_i_reserved1 320#define i_frag osd2.masix2.m_i_frag 321#define i_fsize osd2.masix2.m_i_fsize 322#define i_reserved2 osd2.masix2.m_i_reserved2 323#endif 324 325/* 326 * File system states 327 */ 328#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */ 329#define EXT2_ERROR_FS 0x0002 /* Errors detected */ 330 331/* 332 * Mount flags 333 */ 334#define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */ 335#define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */ 336#define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */ 337#define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */ 338#define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */ 339#define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */ 340#define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */ 341#define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */ 342#define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */ 343#define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */ 344#define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */ 345#define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */ 346#define EXT2_MOUNT_XIP 0x010000 /* Execute in place */ 347#define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */ 348#define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */ 349#define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */ 350 351 352#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt 353#define set_opt(o, opt) o |= EXT2_MOUNT_##opt 354#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \ 355 EXT2_MOUNT_##opt) 356/* 357 * Maximal mount counts between two filesystem checks 358 */ 359#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */ 360#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */ 361 362/* 363 * Behaviour when detecting errors 364 */ 365#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */ 366#define EXT2_ERRORS_RO 2 /* Remount fs read-only */ 367#define EXT2_ERRORS_PANIC 3 /* Panic */ 368#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE 369 370/* 371 * Structure of the super block 372 */ 373struct ext2_super_block { 374 __le32 s_inodes_count; /* Inodes count */ 375 __le32 s_blocks_count; /* Blocks count */ 376 __le32 s_r_blocks_count; /* Reserved blocks count */ 377 __le32 s_free_blocks_count; /* Free blocks count */ 378 __le32 s_free_inodes_count; /* Free inodes count */ 379 __le32 s_first_data_block; /* First Data Block */ 380 __le32 s_log_block_size; /* Block size */ 381 __le32 s_log_frag_size; /* Fragment size */ 382 __le32 s_blocks_per_group; /* # Blocks per group */ 383 __le32 s_frags_per_group; /* # Fragments per group */ 384 __le32 s_inodes_per_group; /* # Inodes per group */ 385 __le32 s_mtime; /* Mount time */ 386 __le32 s_wtime; /* Write time */ 387 __le16 s_mnt_count; /* Mount count */ 388 __le16 s_max_mnt_count; /* Maximal mount count */ 389 __le16 s_magic; /* Magic signature */ 390 __le16 s_state; /* File system state */ 391 __le16 s_errors; /* Behaviour when detecting errors */ 392 __le16 s_minor_rev_level; /* minor revision level */ 393 __le32 s_lastcheck; /* time of last check */ 394 __le32 s_checkinterval; /* max. time between checks */ 395 __le32 s_creator_os; /* OS */ 396 __le32 s_rev_level; /* Revision level */ 397 __le16 s_def_resuid; /* Default uid for reserved blocks */ 398 __le16 s_def_resgid; /* Default gid for reserved blocks */ 399 /* 400 * These fields are for EXT2_DYNAMIC_REV superblocks only. 401 * 402 * Note: the difference between the compatible feature set and 403 * the incompatible feature set is that if there is a bit set 404 * in the incompatible feature set that the kernel doesn't 405 * know about, it should refuse to mount the filesystem. 406 * 407 * e2fsck's requirements are more strict; if it doesn't know 408 * about a feature in either the compatible or incompatible 409 * feature set, it must abort and not try to meddle with 410 * things it doesn't understand... 411 */ 412 __le32 s_first_ino; /* First non-reserved inode */ 413 __le16 s_inode_size; /* size of inode structure */ 414 __le16 s_block_group_nr; /* block group # of this superblock */ 415 __le32 s_feature_compat; /* compatible feature set */ 416 __le32 s_feature_incompat; /* incompatible feature set */ 417 __le32 s_feature_ro_compat; /* readonly-compatible feature set */ 418 __u8 s_uuid[16]; /* 128-bit uuid for volume */ 419 char s_volume_name[16]; /* volume name */ 420 char s_last_mounted[64]; /* directory where last mounted */ 421 __le32 s_algorithm_usage_bitmap; /* For compression */ 422 /* 423 * Performance hints. Directory preallocation should only 424 * happen if the EXT2_COMPAT_PREALLOC flag is on. 425 */ 426 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/ 427 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */ 428 __u16 s_padding1; 429 /* 430 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set. 431 */ 432 __u8 s_journal_uuid[16]; /* uuid of journal superblock */ 433 __u32 s_journal_inum; /* inode number of journal file */ 434 __u32 s_journal_dev; /* device number of journal file */ 435 __u32 s_last_orphan; /* start of list of inodes to delete */ 436 __u32 s_hash_seed[4]; /* HTREE hash seed */ 437 __u8 s_def_hash_version; /* Default hash version to use */ 438 __u8 s_reserved_char_pad; 439 __u16 s_reserved_word_pad; 440 __le32 s_default_mount_opts; 441 __le32 s_first_meta_bg; /* First metablock block group */ 442 __u32 s_reserved[190]; /* Padding to the end of the block */ 443}; 444 445/* 446 * Codes for operating systems 447 */ 448#define EXT2_OS_LINUX 0 449#define EXT2_OS_HURD 1 450#define EXT2_OS_MASIX 2 451#define EXT2_OS_FREEBSD 3 452#define EXT2_OS_LITES 4 453 454/* 455 * Revision levels 456 */ 457#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */ 458#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */ 459 460#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV 461#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV 462 463#define EXT2_GOOD_OLD_INODE_SIZE 128 464 465/* 466 * Feature set definitions 467 */ 468 469#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \ 470 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) ) 471#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \ 472 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) ) 473#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \ 474 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) ) 475#define EXT2_SET_COMPAT_FEATURE(sb,mask) \ 476 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask) 477#define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \ 478 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask) 479#define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \ 480 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask) 481#define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \ 482 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask) 483#define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \ 484 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask) 485#define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \ 486 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask) 487 488#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001 489#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002 490#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004 491#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008 492#define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010 493#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020 494#define EXT2_FEATURE_COMPAT_ANY 0xffffffff 495 496#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001 497#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002 498#define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 499#define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff 500 501#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001 502#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002 503#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 504#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 505#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010 506#define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff 507 508#define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR 509#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \ 510 EXT2_FEATURE_INCOMPAT_META_BG) 511#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \ 512 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \ 513 EXT2_FEATURE_RO_COMPAT_BTREE_DIR) 514#define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP 515#define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP 516 517/* 518 * Default values for user and/or group using reserved blocks 519 */ 520#define EXT2_DEF_RESUID 0 521#define EXT2_DEF_RESGID 0 522 523/* 524 * Default mount options 525 */ 526#define EXT2_DEFM_DEBUG 0x0001 527#define EXT2_DEFM_BSDGROUPS 0x0002 528#define EXT2_DEFM_XATTR_USER 0x0004 529#define EXT2_DEFM_ACL 0x0008 530#define EXT2_DEFM_UID16 0x0010 531 /* Not used by ext2, but reserved for use by ext3 */ 532#define EXT3_DEFM_JMODE 0x0060 533#define EXT3_DEFM_JMODE_DATA 0x0020 534#define EXT3_DEFM_JMODE_ORDERED 0x0040 535#define EXT3_DEFM_JMODE_WBACK 0x0060 536 537/* 538 * Structure of a directory entry 539 */ 540#define EXT2_NAME_LEN 255 541 542struct ext2_dir_entry { 543 __le32 inode; /* Inode number */ 544 __le16 rec_len; /* Directory entry length */ 545 __le16 name_len; /* Name length */ 546 char name[EXT2_NAME_LEN]; /* File name */ 547}; 548 549/* 550 * The new version of the directory entry. Since EXT2 structures are 551 * stored in intel byte order, and the name_len field could never be 552 * bigger than 255 chars, it's safe to reclaim the extra byte for the 553 * file_type field. 554 */ 555struct ext2_dir_entry_2 { 556 __le32 inode; /* Inode number */ 557 __le16 rec_len; /* Directory entry length */ 558 __u8 name_len; /* Name length */ 559 __u8 file_type; 560 char name[EXT2_NAME_LEN]; /* File name */ 561}; 562 563/* 564 * Ext2 directory file types. Only the low 3 bits are used. The 565 * other bits are reserved for now. 566 */ 567enum { 568 EXT2_FT_UNKNOWN = 0, 569 EXT2_FT_REG_FILE = 1, 570 EXT2_FT_DIR = 2, 571 EXT2_FT_CHRDEV = 3, 572 EXT2_FT_BLKDEV = 4, 573 EXT2_FT_FIFO = 5, 574 EXT2_FT_SOCK = 6, 575 EXT2_FT_SYMLINK = 7, 576 EXT2_FT_MAX 577}; 578 579/* 580 * EXT2_DIR_PAD defines the directory entries boundaries 581 * 582 * NOTE: It must be a multiple of 4 583 */ 584#define EXT2_DIR_PAD 4 585#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1) 586#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \ 587 ~EXT2_DIR_ROUND) 588#define EXT2_MAX_REC_LEN ((1<<16)-1) 589 590#endif /* _LINUX_EXT2_FS_H */ 591