source: MondoRescue/branches/2.2.5/mindi-busybox/e2fsprogs/old_e2fsprogs/ext2fs/ext2_fs.h@ 1765

Last change on this file since 1765 was 1765, checked in by Bruno Cornec, 16 years ago

Update to busybox 1.7.2
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1/* vi: set sw=4 ts=4: */
2/*
3 * linux/include/linux/ext2_fs.h
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/include/linux/minix_fs.h
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 */
16
17#ifndef _LINUX_EXT2_FS_H
18#define _LINUX_EXT2_FS_H
19
20#include "ext2_types.h" /* Changed from linux/types.h */
21
22/*
23 * Special inode numbers
24 */
25#define EXT2_BAD_INO 1 /* Bad blocks inode */
26#define EXT2_ROOT_INO 2 /* Root inode */
27#define EXT2_ACL_IDX_INO 3 /* ACL inode */
28#define EXT2_ACL_DATA_INO 4 /* ACL inode */
29#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
30#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
31#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
32#define EXT2_JOURNAL_INO 8 /* Journal inode */
33
34/* First non-reserved inode for old ext2 filesystems */
35#define EXT2_GOOD_OLD_FIRST_INO 11
36
37/*
38 * The second extended file system magic number
39 */
40#define EXT2_SUPER_MAGIC 0xEF53
41
42/* Assume that user mode programs are passing in an ext2fs superblock, not
43 * a kernel struct super_block. This will allow us to call the feature-test
44 * macros from user land. */
45#define EXT2_SB(sb) (sb)
46
47/*
48 * Maximal count of links to a file
49 */
50#define EXT2_LINK_MAX 32000
51
52/*
53 * Macro-instructions used to manage several block sizes
54 */
55#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */
56#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */
57#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE)
58#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE)
59#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
60#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
61#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
62 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
63#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
64 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
65#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
66
67/*
68 * Macro-instructions used to manage fragments
69 */
70#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
71#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
72#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
73# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
74# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
75
76/*
77 * ACL structures
78 */
79struct ext2_acl_header /* Header of Access Control Lists */
80{
81 __u32 aclh_size;
82 __u32 aclh_file_count;
83 __u32 aclh_acle_count;
84 __u32 aclh_first_acle;
85};
86
87struct ext2_acl_entry /* Access Control List Entry */
88{
89 __u32 acle_size;
90 __u16 acle_perms; /* Access permissions */
91 __u16 acle_type; /* Type of entry */
92 __u16 acle_tag; /* User or group identity */
93 __u16 acle_pad1;
94 __u32 acle_next; /* Pointer on next entry for the */
95 /* same inode or on next free entry */
96};
97
98/*
99 * Structure of a blocks group descriptor
100 */
101struct ext2_group_desc
102{
103 __u32 bg_block_bitmap; /* Blocks bitmap block */
104 __u32 bg_inode_bitmap; /* Inodes bitmap block */
105 __u32 bg_inode_table; /* Inodes table block */
106 __u16 bg_free_blocks_count; /* Free blocks count */
107 __u16 bg_free_inodes_count; /* Free inodes count */
108 __u16 bg_used_dirs_count; /* Directories count */
109 __u16 bg_pad;
110 __u32 bg_reserved[3];
111};
112
113/*
114 * Data structures used by the directory indexing feature
115 *
116 * Note: all of the multibyte integer fields are little endian.
117 */
118
119/*
120 * Note: dx_root_info is laid out so that if it should somehow get
121 * overlaid by a dirent the two low bits of the hash version will be
122 * zero. Therefore, the hash version mod 4 should never be 0.
123 * Sincerely, the paranoia department.
124 */
125struct ext2_dx_root_info {
126 __u32 reserved_zero;
127 __u8 hash_version; /* 0 now, 1 at release */
128 __u8 info_length; /* 8 */
129 __u8 indirect_levels;
130 __u8 unused_flags;
131};
132
133#define EXT2_HASH_LEGACY 0
134#define EXT2_HASH_HALF_MD4 1
135#define EXT2_HASH_TEA 2
136
137#define EXT2_HASH_FLAG_INCOMPAT 0x1
138
139struct ext2_dx_entry {
140 __u32 hash;
141 __u32 block;
142};
143
144struct ext2_dx_countlimit {
145 __u16 limit;
146 __u16 count;
147};
148
149
150/*
151 * Macro-instructions used to manage group descriptors
152 */
153#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
154#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
155#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
156/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
157#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8)
158#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
159#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
160
161/*
162 * Constants relative to the data blocks
163 */
164#define EXT2_NDIR_BLOCKS 12
165#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
166#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
167#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
168#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
169
170/*
171 * Inode flags
172 */
173#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
174#define EXT2_UNRM_FL 0x00000002 /* Undelete */
175#define EXT2_COMPR_FL 0x00000004 /* Compress file */
176#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
177#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
178#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
179#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
180#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
181/* Reserved for compression usage... */
182#define EXT2_DIRTY_FL 0x00000100
183#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
184#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
185#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
186/* End compression flags --- maybe not all used */
187#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
188#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
189#define EXT2_IMAGIC_FL 0x00002000
190#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
191#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
192#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
193#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
194#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
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 0x000080FF /* 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 __u16 i_mode; /* File mode */
213 __u16 i_uid; /* Low 16 bits of Owner Uid */
214 __u32 i_size; /* Size in bytes */
215 __u32 i_atime; /* Access time */
216 __u32 i_ctime; /* Creation time */
217 __u32 i_mtime; /* Modification time */
218 __u32 i_dtime; /* Deletion Time */
219 __u16 i_gid; /* Low 16 bits of Group Id */
220 __u16 i_links_count; /* Links count */
221 __u32 i_blocks; /* Blocks count */
222 __u32 i_flags; /* File flags */
223 union {
224 struct {
225 __u32 l_i_reserved1;
226 } linux1;
227 struct {
228 __u32 h_i_translator;
229 } hurd1;
230 struct {
231 __u32 m_i_reserved1;
232 } masix1;
233 } osd1; /* OS dependent 1 */
234 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
235 __u32 i_generation; /* File version (for NFS) */
236 __u32 i_file_acl; /* File ACL */
237 __u32 i_dir_acl; /* Directory ACL */
238 __u32 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 __u16 l_i_uid_high; /* these 2 fields */
245 __u16 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 __u16 h_i_mode_high;
252 __u16 h_i_uid_high;
253 __u16 h_i_gid_high;
254 __u32 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/*
266 * Permanent part of an large inode on the disk
267 */
268struct ext2_inode_large {
269 __u16 i_mode; /* File mode */
270 __u16 i_uid; /* Low 16 bits of Owner Uid */
271 __u32 i_size; /* Size in bytes */
272 __u32 i_atime; /* Access time */
273 __u32 i_ctime; /* Creation time */
274 __u32 i_mtime; /* Modification time */
275 __u32 i_dtime; /* Deletion Time */
276 __u16 i_gid; /* Low 16 bits of Group Id */
277 __u16 i_links_count; /* Links count */
278 __u32 i_blocks; /* Blocks count */
279 __u32 i_flags; /* File flags */
280 union {
281 struct {
282 __u32 l_i_reserved1;
283 } linux1;
284 struct {
285 __u32 h_i_translator;
286 } hurd1;
287 struct {
288 __u32 m_i_reserved1;
289 } masix1;
290 } osd1; /* OS dependent 1 */
291 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
292 __u32 i_generation; /* File version (for NFS) */
293 __u32 i_file_acl; /* File ACL */
294 __u32 i_dir_acl; /* Directory ACL */
295 __u32 i_faddr; /* Fragment address */
296 union {
297 struct {
298 __u8 l_i_frag; /* Fragment number */
299 __u8 l_i_fsize; /* Fragment size */
300 __u16 i_pad1;
301 __u16 l_i_uid_high; /* these 2 fields */
302 __u16 l_i_gid_high; /* were reserved2[0] */
303 __u32 l_i_reserved2;
304 } linux2;
305 struct {
306 __u8 h_i_frag; /* Fragment number */
307 __u8 h_i_fsize; /* Fragment size */
308 __u16 h_i_mode_high;
309 __u16 h_i_uid_high;
310 __u16 h_i_gid_high;
311 __u32 h_i_author;
312 } hurd2;
313 struct {
314 __u8 m_i_frag; /* Fragment number */
315 __u8 m_i_fsize; /* Fragment size */
316 __u16 m_pad1;
317 __u32 m_i_reserved2[2];
318 } masix2;
319 } osd2; /* OS dependent 2 */
320 __u16 i_extra_isize;
321 __u16 i_pad1;
322};
323
324#define i_size_high i_dir_acl
325
326/*
327 * File system states
328 */
329#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
330#define EXT2_ERROR_FS 0x0002 /* Errors detected */
331
332/*
333 * Mount flags
334 */
335#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
336#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
337#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
338#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
339#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
340#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
341#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
342#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
343
344#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
345#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
346#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
347 EXT2_MOUNT_##opt)
348/*
349 * Maximal mount counts between two filesystem checks
350 */
351#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
352#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
353
354/*
355 * Behaviour when detecting errors
356 */
357#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
358#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
359#define EXT2_ERRORS_PANIC 3 /* Panic */
360#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
361
362/*
363 * Structure of the super block
364 */
365struct ext2_super_block {
366 __u32 s_inodes_count; /* Inodes count */
367 __u32 s_blocks_count; /* Blocks count */
368 __u32 s_r_blocks_count; /* Reserved blocks count */
369 __u32 s_free_blocks_count; /* Free blocks count */
370 __u32 s_free_inodes_count; /* Free inodes count */
371 __u32 s_first_data_block; /* First Data Block */
372 __u32 s_log_block_size; /* Block size */
373 __s32 s_log_frag_size; /* Fragment size */
374 __u32 s_blocks_per_group; /* # Blocks per group */
375 __u32 s_frags_per_group; /* # Fragments per group */
376 __u32 s_inodes_per_group; /* # Inodes per group */
377 __u32 s_mtime; /* Mount time */
378 __u32 s_wtime; /* Write time */
379 __u16 s_mnt_count; /* Mount count */
380 __s16 s_max_mnt_count; /* Maximal mount count */
381 __u16 s_magic; /* Magic signature */
382 __u16 s_state; /* File system state */
383 __u16 s_errors; /* Behaviour when detecting errors */
384 __u16 s_minor_rev_level; /* minor revision level */
385 __u32 s_lastcheck; /* time of last check */
386 __u32 s_checkinterval; /* max. time between checks */
387 __u32 s_creator_os; /* OS */
388 __u32 s_rev_level; /* Revision level */
389 __u16 s_def_resuid; /* Default uid for reserved blocks */
390 __u16 s_def_resgid; /* Default gid for reserved blocks */
391 /*
392 * These fields are for EXT2_DYNAMIC_REV superblocks only.
393 *
394 * Note: the difference between the compatible feature set and
395 * the incompatible feature set is that if there is a bit set
396 * in the incompatible feature set that the kernel doesn't
397 * know about, it should refuse to mount the filesystem.
398 *
399 * e2fsck's requirements are more strict; if it doesn't know
400 * about a feature in either the compatible or incompatible
401 * feature set, it must abort and not try to meddle with
402 * things it doesn't understand...
403 */
404 __u32 s_first_ino; /* First non-reserved inode */
405 __u16 s_inode_size; /* size of inode structure */
406 __u16 s_block_group_nr; /* block group # of this superblock */
407 __u32 s_feature_compat; /* compatible feature set */
408 __u32 s_feature_incompat; /* incompatible feature set */
409 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
410 __u8 s_uuid[16]; /* 128-bit uuid for volume */
411 char s_volume_name[16]; /* volume name */
412 char s_last_mounted[64]; /* directory where last mounted */
413 __u32 s_algorithm_usage_bitmap; /* For compression */
414 /*
415 * Performance hints. Directory preallocation should only
416 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
417 */
418 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
419 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
420 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */
421 /*
422 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
423 */
424 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
425 __u32 s_journal_inum; /* inode number of journal file */
426 __u32 s_journal_dev; /* device number of journal file */
427 __u32 s_last_orphan; /* start of list of inodes to delete */
428 __u32 s_hash_seed[4]; /* HTREE hash seed */
429 __u8 s_def_hash_version; /* Default hash version to use */
430 __u8 s_jnl_backup_type; /* Default type of journal backup */
431 __u16 s_reserved_word_pad;
432 __u32 s_default_mount_opts;
433 __u32 s_first_meta_bg; /* First metablock group */
434 __u32 s_mkfs_time; /* When the filesystem was created */
435 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
436 __u32 s_reserved[172]; /* Padding to the end of the block */
437};
438
439/*
440 * Codes for operating systems
441 */
442#define EXT2_OS_LINUX 0
443#define EXT2_OS_HURD 1
444#define EXT2_OS_MASIX 2
445#define EXT2_OS_FREEBSD 3
446#define EXT2_OS_LITES 4
447
448/*
449 * Revision levels
450 */
451#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
452#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
453
454#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
455#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
456
457#define EXT2_GOOD_OLD_INODE_SIZE 128
458
459/*
460 * Journal inode backup types
461 */
462#define EXT3_JNL_BACKUP_BLOCKS 1
463
464/*
465 * Feature set definitions
466 */
467
468#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
469 ( EXT2_SB(sb)->s_feature_compat & (mask) )
470#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
471 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
472#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
473 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
474
475#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
476#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
477#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
478#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
479#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
480#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
481
482#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
483#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
484/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
485
486#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
487#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
488#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
489#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
490#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
491#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
492
493
494#define EXT2_FEATURE_COMPAT_SUPP 0
495#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
496#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
497 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
498 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
499
500/*
501 * Default values for user and/or group using reserved blocks
502 */
503#define EXT2_DEF_RESUID 0
504#define EXT2_DEF_RESGID 0
505
506/*
507 * Default mount options
508 */
509#define EXT2_DEFM_DEBUG 0x0001
510#define EXT2_DEFM_BSDGROUPS 0x0002
511#define EXT2_DEFM_XATTR_USER 0x0004
512#define EXT2_DEFM_ACL 0x0008
513#define EXT2_DEFM_UID16 0x0010
514#define EXT3_DEFM_JMODE 0x0060
515#define EXT3_DEFM_JMODE_DATA 0x0020
516#define EXT3_DEFM_JMODE_ORDERED 0x0040
517#define EXT3_DEFM_JMODE_WBACK 0x0060
518
519/*
520 * Structure of a directory entry
521 */
522#define EXT2_NAME_LEN 255
523
524struct ext2_dir_entry {
525 __u32 inode; /* Inode number */
526 __u16 rec_len; /* Directory entry length */
527 __u16 name_len; /* Name length */
528 char name[EXT2_NAME_LEN]; /* File name */
529};
530
531/*
532 * The new version of the directory entry. Since EXT2 structures are
533 * stored in intel byte order, and the name_len field could never be
534 * bigger than 255 chars, it's safe to reclaim the extra byte for the
535 * file_type field.
536 */
537struct ext2_dir_entry_2 {
538 __u32 inode; /* Inode number */
539 __u16 rec_len; /* Directory entry length */
540 __u8 name_len; /* Name length */
541 __u8 file_type;
542 char name[EXT2_NAME_LEN]; /* File name */
543};
544
545/*
546 * Ext2 directory file types. Only the low 3 bits are used. The
547 * other bits are reserved for now.
548 */
549#define EXT2_FT_UNKNOWN 0
550#define EXT2_FT_REG_FILE 1
551#define EXT2_FT_DIR 2
552#define EXT2_FT_CHRDEV 3
553#define EXT2_FT_BLKDEV 4
554#define EXT2_FT_FIFO 5
555#define EXT2_FT_SOCK 6
556#define EXT2_FT_SYMLINK 7
557
558#define EXT2_FT_MAX 8
559
560/*
561 * EXT2_DIR_PAD defines the directory entries boundaries
562 *
563 * NOTE: It must be a multiple of 4
564 */
565#define EXT2_DIR_PAD 4
566#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
567#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
568 ~EXT2_DIR_ROUND)
569
570#endif /* _LINUX_EXT2_FS_H */
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