2 * modified for EXT2FS support in Lites 1.1
4 * Aug 1995, Godmar Back (gback@cs.utah.edu)
5 * University of Utah, Department of Computer Science
7 * $FreeBSD: src/sys/gnu/ext2fs/ext2_fs.h,v 1.8.2.2 2001/09/29 12:52:47 iedowse Exp $
10 * linux/include/linux/ext2_fs.h
12 * Copyright (C) 1992, 1993, 1994, 1995
13 * Remy Card (card@masi.ibp.fr)
14 * Laboratoire MASI - Institut Blaise Pascal
15 * Universite Pierre et Marie Curie (Paris VI)
19 * linux/include/linux/minix_fs.h
21 * Copyright (C) 1991, 1992 Linus Torvalds
24 #ifndef _LINUX_EXT2_FS_H
25 #define _LINUX_EXT2_FS_H
27 #include <sys/types.h>
28 #include <sys/ioccom.h>
30 #define __u32 u_int32_t
32 #define __u16 u_int16_t
39 #define umode_t mode_t
42 /* the Linux implementation of EXT2 stores some information about
43 * an inode in a ext2_inode_info structure which is part of the incore
45 * I decided to use the "spare" fields instead - we'll see how this
49 #define i_block_group i_spare[0]
50 #define i_next_alloc_block i_spare[1]
51 #define i_next_alloc_goal i_spare[2]
52 #define i_prealloc_block i_din.di_spare[0]
53 #define i_prealloc_count i_din.di_spare[1]
56 * The second extended filesystem constants/structures
60 * Define EXT2FS_DEBUG to produce debug messages
65 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
67 #define EXT2_PREALLOCATE
68 #define EXT2_DEFAULT_PREALLOC_BLOCKS 8
71 * The second extended file system version
73 #define EXT2FS_DATE "95/08/09"
74 #define EXT2FS_VERSION "0.5b"
80 #define ext2_debug(f, a...) { \
81 kprintf ("EXT2-fs DEBUG (%s, %d): %s:", \
82 __FILE__, __LINE__, __func__); \
86 #define ext2_debug(f, a...) /**/
90 * Special inodes numbers
92 #define EXT2_BAD_INO 1 /* Bad blocks inode */
93 #define EXT2_ROOT_INO 2 /* Root inode, but rather use EXT2_ROOTINO */
94 #define EXT2_ACL_IDX_INO 3 /* ACL inode */
95 #define EXT2_ACL_DATA_INO 4 /* ACL inode */
96 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
97 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
99 /* First non-reserved inode for old ext2 filesystems */
100 #define EXT2_GOOD_OLD_FIRST_INO 11
103 * The second extended file system magic number
105 #define EXT2_SUPER_MAGIC 0xEF53
108 * Maximal count of links to a file
110 #define EXT2_LINK_MAX 32000
113 * Note: under FreeBSD, the "user" versions of the following macros are
114 * used (and must be used) in most cases, because ((s)->u.ext2_sb.s_es is
115 * not accessible. This depends on __KERNEL__ not being defined for
116 * kernel builds under FreeBSD.
119 * Arguments s of the following EXT2_XXX(s) macros in Linux kernel take
120 * generic (non-ext2 specific) inmemory superblock structure. On DragonFly,
121 * the type of s is either generic inmemory, ext2 inmemory, or ext2 ondisk
122 * superblock structure. These macro definitions are actually taken from
123 * e2fsprogs and made to work.
125 * Also note that on DragonFly, the macro EXT2_SB(s) takes ext2 ondisk
126 * superblock structure and does nothing (see the comment on EXT2_SB(s),
127 * it's for userspace to access ondisk superblock structure for testings,
128 * etc, originally introduced by e2fsprogs).
132 * Macro-instructions used to manage several block sizes
134 #define EXT2_MIN_BLOCK_SIZE 1024
135 #define EXT2_MAX_BLOCK_SIZE 4096
136 #define EXT2_MIN_BLOCK_LOG_SIZE 10
137 #if (defined(__DragonFly__) && defined(_KERNEL))
138 #define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
140 #define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
142 #define EXT2_ACLE_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_acl_entry))
143 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
145 * XXX DragonFly's inmemory superblock has no s_addr_per_block_bits.
147 /* #define EXT2_ADDR_PER_BLOCK_BITS(s) ((s)->s_addr_per_block_bits) */
149 * XXX The first one takes ext2 inmemory superblock structure and the
150 * second one takes ext2 ondisk superblock structure. The second one
151 * has been used on DragonFly to compute ((s)->s_blocksize_bits).
153 /* #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits) */
154 #define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10) /* log2(siz)-10 + log2(1024) */
156 #define EXT2_INODE_SIZE(s) ((s)->s_inode_size)
157 #define EXT2_FIRST_INO(s) ((s)->s_first_ino)
159 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
160 EXT2_GOOD_OLD_INODE_SIZE : \
162 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
163 EXT2_GOOD_OLD_FIRST_INO : \
166 #define EXT2_INODES_PER_BLOCK(s) ((s)->s_inodes_per_block)
168 * Macro-instructions used to manage fragments
170 #define EXT2_MIN_FRAG_SIZE 1024
171 #define EXT2_MAX_FRAG_SIZE 4096
172 #define EXT2_MIN_FRAG_LOG_SIZE 10
173 #if defined(_KERNEL) && defined(__DragonFly__)
174 #define EXT2_FRAG_SIZE(s) ((s)->s_frag_size)
176 * XXX The second one has been used on DragonFly, but the first one
177 * with properly initialized s_frags_per_block is probably a better way.
178 * Also note that ext2 does not support block fragmentation.
180 /* #define EXT2_FRAGS_PER_BLOCK(s) ((s)->s_frags_per_block) */
181 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
183 #define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
184 #define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
190 struct ext2_acl_header /* Header of Access Control Lists */
193 __u32 aclh_file_count;
194 __u32 aclh_acle_count;
195 __u32 aclh_first_acle;
198 struct ext2_acl_entry /* Access Control List Entry */
201 __u16 acle_perms; /* Access permissions */
202 __u16 acle_type; /* Type of entry */
203 __u16 acle_tag; /* User or group identity */
205 __u32 acle_next; /* Pointer on next entry for the */
206 /* same inode or on next free entry */
210 * Structure of a blocks group descriptor
212 struct ext2_group_desc
214 __u32 bg_block_bitmap; /* Blocks bitmap block */
215 __u32 bg_inode_bitmap; /* Inodes bitmap block */
216 __u32 bg_inode_table; /* Inodes table block */
217 __u16 bg_free_blocks_count; /* Free blocks count */
218 __u16 bg_free_inodes_count; /* Free inodes count */
219 __u16 bg_used_dirs_count; /* Directories count */
221 __u32 bg_reserved[3];
225 * Macro-instructions used to manage group descriptors
227 #define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
228 #define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
229 #define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
232 * Constants relative to the data blocks
234 #define EXT2_NDIR_BLOCKS 12
235 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
236 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
237 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
238 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
239 #define EXT2_MAXSYMLINKLEN (EXT2_N_BLOCKS * sizeof (__u32))
244 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
245 #define EXT2_UNRM_FL 0x00000002 /* Undelete */
246 #define EXT2_COMPR_FL 0x00000004 /* Compress file */
247 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
248 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
249 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
250 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
251 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
252 /* Reserved for compression usage... */
253 #define EXT2_DIRTY_FL 0x00000100
254 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
255 #define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */
256 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
257 /* End compression flags --- maybe not all used */
258 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
259 #define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
261 #define EXT2_FL_USER_VISIBLE 0x00001FFF /* User visible flags */
262 #define EXT2_FL_USER_MODIFIABLE 0x000000FF /* User modifiable flags */
267 #define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
268 #define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
269 #define EXT2_IOC_GETVERSION _IOR('v', 1, long)
270 #define EXT2_IOC_SETVERSION _IOW('v', 2, long)
273 * Only declare `struct ext2_inode' if <vfs/ufs/inode.h> hasn't made things
274 * difficult by #defining i_mode and other struct members. The details of
275 * the struct are only needed in ext2_inode_cnv.c where the ext2fs on-disk
276 * inode is converted to a ufs in-core inode.
281 * Structure of an inode on the disk
284 __u16 i_mode; /* File mode */
285 __u16 i_uid; /* Owner Uid */
286 __u32 i_size; /* Size in bytes */
287 __u32 i_atime; /* Access time */
288 __u32 i_ctime; /* Creation time */
289 __u32 i_mtime; /* Modification time */
290 __u32 i_dtime; /* Deletion Time */
291 __u16 i_gid; /* Group Id */
292 __u16 i_links_count; /* Links count */
293 __u32 i_blocks; /* Blocks count */
294 __u32 i_flags; /* File flags */
300 __u32 h_i_translator;
305 } osd1; /* OS dependent 1 */
306 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
307 __u32 i_generation; /* File version (for NFS) */
308 __u32 i_file_acl; /* File ACL */
309 __u32 i_dir_acl; /* Directory ACL */
310 __u32 i_faddr; /* Fragment address */
313 __u8 l_i_frag; /* Fragment number */
314 __u8 l_i_fsize; /* Fragment size */
316 __u16 l_i_uid_high; /* these 2 fields */
317 __u16 l_i_gid_high; /* were reserved2[0] */
321 __u8 h_i_frag; /* Fragment number */
322 __u8 h_i_fsize; /* Fragment size */
329 __u8 m_i_frag; /* Fragment number */
330 __u8 m_i_fsize; /* Fragment size */
332 __u32 m_i_reserved2[2];
334 } osd2; /* OS dependent 2 */
337 #define i_size_high i_dir_acl
339 #if defined(__KERNEL__) || defined(__linux__)
340 #define i_reserved1 osd1.linux1.l_i_reserved1
341 #define i_frag osd2.linux2.l_i_frag
342 #define i_fsize osd2.linux2.l_i_fsize
343 #define i_uid_low i_uid
344 #define i_gid_low i_gid
345 #define i_uid_high osd2.linux2.l_i_uid_high
346 #define i_gid_high osd2.linux2.l_i_gid_high
347 #define i_reserved2 osd2.linux2.l_i_reserved2
351 #define i_translator osd1.hurd1.h_i_translator
352 #define i_frag osd2.hurd2.h_i_frag;
353 #define i_fsize osd2.hurd2.h_i_fsize;
354 #define i_uid_high osd2.hurd2.h_i_uid_high
355 #define i_gid_high osd2.hurd2.h_i_gid_high
356 #define i_author osd2.hurd2.h_i_author
360 #define i_reserved1 osd1.masix1.m_i_reserved1
361 #define i_frag osd2.masix2.m_i_frag
362 #define i_fsize osd2.masix2.m_i_fsize
363 #define i_reserved2 osd2.masix2.m_i_reserved2
371 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
372 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
377 #define EXT2_MOUNT_CHECK_NORMAL 0x0001 /* Do some more checks */
378 #define EXT2_MOUNT_CHECK_STRICT 0x0002 /* Do again more checks */
379 #define EXT2_MOUNT_CHECK (EXT2_MOUNT_CHECK_NORMAL | \
380 EXT2_MOUNT_CHECK_STRICT)
381 #define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
382 #define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
383 #define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
384 #define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
385 #define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
386 #define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
387 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
388 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
389 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
390 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
391 #define EXT2_MOUNT_XIP 0x010000 /* Obsolete, use DAX */
392 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
393 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
394 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
396 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
397 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
398 #define test_opt(sb, opt) ((sb)->u.ext2_sb.s_mount_opt & \
401 * Maximal mount counts between two filesystem checks
403 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
404 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
407 * Behaviour when detecting errors
409 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
410 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
411 #define EXT2_ERRORS_PANIC 3 /* Panic */
412 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
415 * Structure of the super block
417 struct ext2_super_block {
418 __u32 s_inodes_count; /* Inodes count */
419 __u32 s_blocks_count; /* Blocks count */
420 __u32 s_r_blocks_count; /* Reserved blocks count */
421 __u32 s_free_blocks_count; /* Free blocks count */
422 __u32 s_free_inodes_count; /* Free inodes count */
423 __u32 s_first_data_block; /* First Data Block */
424 __u32 s_log_block_size; /* Block size */
425 __s32 s_log_frag_size; /* Fragment size */
426 __u32 s_blocks_per_group; /* # Blocks per group */
427 __u32 s_frags_per_group; /* # Fragments per group */
428 __u32 s_inodes_per_group; /* # Inodes per group */
429 __u32 s_mtime; /* Mount time */
430 __u32 s_wtime; /* Write time */
431 __u16 s_mnt_count; /* Mount count */
432 __s16 s_max_mnt_count; /* Maximal mount count */
433 __u16 s_magic; /* Magic signature */
434 __u16 s_state; /* File system state */
435 __u16 s_errors; /* Behaviour when detecting errors */
436 __u16 s_minor_rev_level; /* minor revision level */
437 __u32 s_lastcheck; /* time of last check */
438 __u32 s_checkinterval; /* max. time between checks */
439 __u32 s_creator_os; /* OS */
440 __u32 s_rev_level; /* Revision level */
441 __u16 s_def_resuid; /* Default uid for reserved blocks */
442 __u16 s_def_resgid; /* Default gid for reserved blocks */
444 * These fields are for EXT2_DYNAMIC_REV superblocks only.
446 * Note: the difference between the compatible feature set and
447 * the incompatible feature set is that if there is a bit set
448 * in the incompatible feature set that the kernel doesn't
449 * know about, it should refuse to mount the filesystem.
451 * e2fsck's requirements are more strict; if it doesn't know
452 * about a feature in either the compatible or incompatible
453 * feature set, it must abort and not try to meddle with
454 * things it doesn't understand...
456 __u32 s_first_ino; /* First non-reserved inode */
457 __u16 s_inode_size; /* size of inode structure */
458 __u16 s_block_group_nr; /* block group # of this superblock */
459 __u32 s_feature_compat; /* compatible feature set */
460 __u32 s_feature_incompat; /* incompatible feature set */
461 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
462 __u8 s_uuid[16]; /* 128-bit uuid for volume */
463 char s_volume_name[16]; /* volume name */
464 char s_last_mounted[64]; /* directory where last mounted */
465 __u32 s_algorithm_usage_bitmap; /* For compression */
467 * Performance hints. Directory preallocation should only
468 * happen if the EXT2_COMPAT_PREALLOC flag is on.
470 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
471 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
474 * Journaling support for ext3.
476 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
477 __u32 s_journal_inum; /* inode number of journal file */
478 __u32 s_journal_dev; /* device number of journal file */
479 __u32 s_last_orphan; /* start of list of inodes to delete */
480 __u32 s_hash_seed[4]; /* HTREE hash seed */
481 __u8 s_def_hash_version; /* Default hash version to use */
482 __u8 s_reserved_char_pad;
483 __u16 s_reserved_word_pad;
484 __u32 s_default_mount_opts;
485 __u32 s_first_meta_bg; /* First metablock block group */
486 __u32 s_reserved[190]; /* Padding to the end of the block */
489 /* Assume that user mode programs are passing in an ext2fs superblock, not
490 * a kernel struct super_block. This will allow us to call the feature-test
491 * macros from user land. */
492 #define EXT2_SB(sb) (sb)
495 * Codes for operating systems
497 #define EXT2_OS_LINUX 0
498 #define EXT2_OS_HURD 1
499 #define EXT2_OS_MASIX 2
500 #define EXT2_OS_FREEBSD 3
501 #define EXT2_OS_LITES 4
506 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
507 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
509 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
510 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
512 #define EXT2_GOOD_OLD_INODE_SIZE 128
515 * Feature set definitions
518 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
519 ( EXT2_SB(sb)->s_feature_compat & (mask) )
520 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
521 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
522 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
523 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
524 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
525 EXT2_SB(sb)->s_es->s_feature_compat |= (mask)
526 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
527 EXT2_SB(sb)->s_es->s_feature_ro_compat |= (mask)
528 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
529 EXT2_SB(sb)->s_es->s_feature_incompat |= (mask)
530 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
531 EXT2_SB(sb)->s_es->s_feature_compat &= ~(mask)
532 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
533 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~(mask)
534 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
535 EXT2_SB(sb)->s_es->s_feature_incompat &= ~(mask)
537 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
538 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
539 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
540 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
541 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
542 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
543 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
545 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
546 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
547 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
548 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
550 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
551 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
552 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
553 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
554 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
555 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
558 #define EXT2_FEATURE_COMPAT_SUPP 0
559 #define EXT2_FEATURE_INCOMPAT_SUPP EXT2_FEATURE_INCOMPAT_FILETYPE
561 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
562 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
563 EXT2_FEATURE_INCOMPAT_META_BG)
567 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
568 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
569 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
571 #define EXT2_FEATURE_RO_COMPAT_SUPP EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER
573 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
574 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
577 * Default values for user and/or group using reserved blocks
579 #define EXT2_DEF_RESUID 0
580 #define EXT2_DEF_RESGID 0
583 * Structure of a directory entry
585 #define EXT2_NAME_LEN 255
587 struct ext2_dir_entry {
588 __u32 inode; /* Inode number */
589 __u16 rec_len; /* Directory entry length */
590 __u16 name_len; /* Name length */
591 char name[EXT2_NAME_LEN]; /* File name */
595 * The new version of the directory entry. Since EXT2 structures are
596 * stored in intel byte order, and the name_len field could never be
597 * bigger than 255 chars, it's safe to reclaim the extra byte for the
600 struct ext2_dir_entry_2 {
601 __u32 inode; /* Inode number */
602 __u16 rec_len; /* Directory entry length */
603 __u8 name_len; /* Name length */
605 char name[EXT2_NAME_LEN]; /* File name */
609 * Ext2 directory file types. Only the low 3 bits are used. The
610 * other bits are reserved for now.
612 #define EXT2_FT_UNKNOWN 0
613 #define EXT2_FT_REG_FILE 1
614 #define EXT2_FT_DIR 2
615 #define EXT2_FT_CHRDEV 3
616 #define EXT2_FT_BLKDEV 4
617 #define EXT2_FT_FIFO 5
618 #define EXT2_FT_SOCK 6
619 #define EXT2_FT_SYMLINK 7
621 #define EXT2_FT_MAX 8
624 * EXT2_DIR_PAD defines the directory entries boundaries
626 * NOTE: It must be a multiple of 4
628 #define EXT2_DIR_PAD 4
629 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
630 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
632 #define EXT2_MAX_REC_LEN ((1<<16)-1)
634 #endif /* _LINUX_EXT2_FS_H */