2 * linux/include/linux/ext2_fs.h
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)
11 * linux/include/linux/minix_fs.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
16 #ifndef _LINUX_EXT2_FS_H
17 #define _LINUX_EXT2_FS_H
19 #include <ext2fs/ext2_types.h> /* Changed from linux/types.h */
22 * The second extended filesystem constants/structures
26 * Define EXT2FS_DEBUG to produce debug messages
31 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
33 #define EXT2_PREALLOCATE
34 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8
37 * The second extended file system version
39 #define EXT2FS_DATE "95/08/09"
40 #define EXT2FS_VERSION "0.5b"
43 * Special inode numbers
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 */
54 /* First non-reserved inode for old ext2 filesystems */
55 #define EXT2_GOOD_OLD_FIRST_INO 11
58 * The second extended file system magic number
60 #define EXT2_SUPER_MAGIC 0xEF53
63 #define EXT2_SB(sb) (&((sb)->u.ext2_sb))
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)
72 * Maximal count of links to a file
74 #define EXT2_LINK_MAX 32000
77 * Macro-instructions used to manage several block sizes
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)
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)
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)
97 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
100 * Macro-instructions used to manage fragments
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
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)
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))
116 struct ext2_acl_header /* Header of Access Control Lists */
119 __u32 aclh_file_count;
120 __u32 aclh_acle_count;
121 __u32 aclh_first_acle;
124 struct ext2_acl_entry /* Access Control List Entry */
127 __u16 acle_perms; /* Access permissions */
128 __u16 acle_type; /* Type of entry */
129 __u16 acle_tag; /* User or group identity */
131 __u32 acle_next; /* Pointer on next entry for the */
132 /* same inode or on next free entry */
136 * Structure of a blocks group descriptor
138 struct ext2_group_desc
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 */
147 __u32 bg_reserved[3];
150 #define EXT2_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not initialized */
151 #define EXT2_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not initialized */
154 * Data structures used by the directory indexing feature
156 * Note: all of the multibyte integer fields are little endian.
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.
165 struct ext2_dx_root_info {
167 __u8 hash_version; /* 0 now, 1 at release */
168 __u8 info_length; /* 8 */
169 __u8 indirect_levels;
173 #define EXT2_HASH_LEGACY 0
174 #define EXT2_HASH_HALF_MD4 1
175 #define EXT2_HASH_TEA 2
177 #define EXT2_HASH_FLAG_INCOMPAT 0x1
179 struct ext2_dx_entry {
184 struct ext2_dx_countlimit {
191 * Macro-instructions used to manage group descriptors
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))
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)
203 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
207 * Constants relative to the data blocks
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)
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 EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
240 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
242 #define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
243 #define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
249 /* Used for online resize */
250 struct 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 */
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)
270 * Structure of an inode on the disk
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 */
289 __u32 h_i_translator;
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 */
302 __u8 l_i_frag; /* Fragment number */
303 __u8 l_i_fsize; /* Fragment size */
305 __u16 l_i_uid_high; /* these 2 fields */
306 __u16 l_i_gid_high; /* were reserved2[0] */
310 __u8 h_i_frag; /* Fragment number */
311 __u8 h_i_fsize; /* Fragment size */
318 __u8 m_i_frag; /* Fragment number */
319 __u8 m_i_fsize; /* Fragment size */
321 __u32 m_i_reserved2[2];
323 } osd2; /* OS dependent 2 */
327 * Permanent part of an large inode on the disk
329 struct 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 */
346 __u32 h_i_translator;
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 */
359 __u8 l_i_frag; /* Fragment number */
360 __u8 l_i_fsize; /* Fragment size */
362 __u16 l_i_uid_high; /* these 2 fields */
363 __u16 l_i_gid_high; /* were reserved2[0] */
367 __u8 h_i_frag; /* Fragment number */
368 __u8 h_i_fsize; /* Fragment size */
375 __u8 m_i_frag; /* Fragment number */
376 __u8 m_i_fsize; /* Fragment size */
378 __u32 m_i_reserved2[2];
380 } osd2; /* OS dependent 2 */
385 #define i_size_high i_dir_acl
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
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
408 #if defined(__masix__)
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
415 #endif /* __masix__ */
417 #endif /* defined(__KERNEL__) || defined(__linux__) */
422 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
423 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
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 */
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 & \
442 * Maximal mount counts between two filesystem checks
444 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
445 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
448 * Behaviour when detecting errors
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
456 * Structure of the super block
458 struct 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 */
485 * These fields are for EXT2_DYNAMIC_REV superblocks only.
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.
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...
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 */
508 * Performance hints. Directory preallocation should only
509 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
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 */
515 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
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 */
533 * Codes for operating systems
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
544 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
545 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
547 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
548 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
550 #define EXT2_GOOD_OLD_INODE_SIZE 128
553 * Journal inode backup types
555 #define EXT3_JNL_BACKUP_BLOCKS 1
558 * Feature set definitions
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) )
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
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 */
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
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)
595 * Default values for user and/or group using reserved blocks
597 #define EXT2_DEF_RESUID 0
598 #define EXT2_DEF_RESGID 0
601 * Default mount options
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
614 * Structure of a directory entry
616 #define EXT2_NAME_LEN 255
618 struct 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 */
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
631 struct ext2_dir_entry_2 {
632 __u32 inode; /* Inode number */
633 __u16 rec_len; /* Directory entry length */
634 __u8 name_len; /* Name length */
636 char name[EXT2_NAME_LEN]; /* File name */
640 * Ext2 directory file types. Only the low 3 bits are used. The
641 * other bits are reserved for now.
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
652 #define EXT2_FT_MAX 8
655 * EXT2_DIR_PAD defines the directory entries boundaries
657 * NOTE: It must be a multiple of 4
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) & \
664 #endif /* _LINUX_EXT2_FS_H */