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Denis Vlasenkoc4f623e2006-12-26 01:30:59 +00001/* 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 */
Denis Vlasenkof81e8db2009-04-09 12:35:13 +000016#ifndef LINUX_EXT2_FS_H
17#define LINUX_EXT2_FS_H 1
Denis Vlasenkoc4f623e2006-12-26 01:30:59 +000018
19#include "ext2_types.h" /* Changed from linux/types.h */
20
21/*
22 * Special inode numbers
23 */
24#define EXT2_BAD_INO 1 /* Bad blocks inode */
25#define EXT2_ROOT_INO 2 /* Root inode */
26#define EXT2_ACL_IDX_INO 3 /* ACL inode */
27#define EXT2_ACL_DATA_INO 4 /* ACL inode */
28#define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
29#define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
30#define EXT2_RESIZE_INO 7 /* Reserved group descriptors inode */
31#define EXT2_JOURNAL_INO 8 /* Journal inode */
32
33/* First non-reserved inode for old ext2 filesystems */
34#define EXT2_GOOD_OLD_FIRST_INO 11
35
36/*
37 * The second extended file system magic number
38 */
39#define EXT2_SUPER_MAGIC 0xEF53
40
41/* Assume that user mode programs are passing in an ext2fs superblock, not
42 * a kernel struct super_block. This will allow us to call the feature-test
43 * macros from user land. */
44#define EXT2_SB(sb) (sb)
45
46/*
47 * Maximal count of links to a file
48 */
49#define EXT2_LINK_MAX 32000
50
51/*
52 * Macro-instructions used to manage several block sizes
53 */
54#define EXT2_MIN_BLOCK_LOG_SIZE 10 /* 1024 */
55#define EXT2_MAX_BLOCK_LOG_SIZE 16 /* 65536 */
56#define EXT2_MIN_BLOCK_SIZE (1 << EXT2_MIN_BLOCK_LOG_SIZE)
57#define EXT2_MAX_BLOCK_SIZE (1 << EXT2_MAX_BLOCK_LOG_SIZE)
58#define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
59#define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
60#define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
61 EXT2_GOOD_OLD_INODE_SIZE : (s)->s_inode_size)
62#define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
63 EXT2_GOOD_OLD_FIRST_INO : (s)->s_first_ino)
64#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
65
66/*
67 * Macro-instructions used to manage fragments
68 */
69#define EXT2_MIN_FRAG_SIZE EXT2_MIN_BLOCK_SIZE
70#define EXT2_MAX_FRAG_SIZE EXT2_MAX_BLOCK_SIZE
71#define EXT2_MIN_FRAG_LOG_SIZE EXT2_MIN_BLOCK_LOG_SIZE
72# define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
73# define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
74
75/*
76 * ACL structures
77 */
78struct ext2_acl_header /* Header of Access Control Lists */
79{
80 __u32 aclh_size;
81 __u32 aclh_file_count;
82 __u32 aclh_acle_count;
83 __u32 aclh_first_acle;
84};
85
86struct ext2_acl_entry /* Access Control List Entry */
87{
88 __u32 acle_size;
89 __u16 acle_perms; /* Access permissions */
90 __u16 acle_type; /* Type of entry */
91 __u16 acle_tag; /* User or group identity */
92 __u16 acle_pad1;
93 __u32 acle_next; /* Pointer on next entry for the */
94 /* same inode or on next free entry */
95};
96
97/*
98 * Structure of a blocks group descriptor
99 */
100struct ext2_group_desc
101{
102 __u32 bg_block_bitmap; /* Blocks bitmap block */
103 __u32 bg_inode_bitmap; /* Inodes bitmap block */
104 __u32 bg_inode_table; /* Inodes table block */
105 __u16 bg_free_blocks_count; /* Free blocks count */
106 __u16 bg_free_inodes_count; /* Free inodes count */
107 __u16 bg_used_dirs_count; /* Directories count */
108 __u16 bg_pad;
109 __u32 bg_reserved[3];
110};
111
112/*
113 * Data structures used by the directory indexing feature
114 *
115 * Note: all of the multibyte integer fields are little endian.
116 */
117
118/*
119 * Note: dx_root_info is laid out so that if it should somehow get
120 * overlaid by a dirent the two low bits of the hash version will be
121 * zero. Therefore, the hash version mod 4 should never be 0.
122 * Sincerely, the paranoia department.
123 */
124struct ext2_dx_root_info {
125 __u32 reserved_zero;
126 __u8 hash_version; /* 0 now, 1 at release */
127 __u8 info_length; /* 8 */
128 __u8 indirect_levels;
129 __u8 unused_flags;
130};
131
132#define EXT2_HASH_LEGACY 0
133#define EXT2_HASH_HALF_MD4 1
134#define EXT2_HASH_TEA 2
135
136#define EXT2_HASH_FLAG_INCOMPAT 0x1
137
138struct ext2_dx_entry {
139 __u32 hash;
140 __u32 block;
141};
142
143struct ext2_dx_countlimit {
144 __u16 limit;
145 __u16 count;
146};
147
148
149/*
150 * Macro-instructions used to manage group descriptors
151 */
152#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
153#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
154#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
155/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
156#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8)
157#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
158#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
159
160/*
161 * Constants relative to the data blocks
162 */
163#define EXT2_NDIR_BLOCKS 12
164#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
165#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
166#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
167#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
168
169/*
170 * Inode flags
171 */
172#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
173#define EXT2_UNRM_FL 0x00000002 /* Undelete */
174#define EXT2_COMPR_FL 0x00000004 /* Compress file */
175#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
176#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
177#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
178#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
179#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
180/* Reserved for compression usage... */
181#define EXT2_DIRTY_FL 0x00000100
182#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
183#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
184#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
185/* End compression flags --- maybe not all used */
186#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
187#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
188#define EXT2_IMAGIC_FL 0x00002000
189#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
190#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
191#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
192#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
193#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
194#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
195
196#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
197#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
198
199/*
200 * ioctl commands
201 */
202#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
203#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
204#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
205#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
206
207/*
208 * Structure of an inode on the disk
209 */
210struct ext2_inode {
211 __u16 i_mode; /* File mode */
212 __u16 i_uid; /* Low 16 bits of Owner Uid */
213 __u32 i_size; /* Size in bytes */
214 __u32 i_atime; /* Access time */
215 __u32 i_ctime; /* Creation time */
216 __u32 i_mtime; /* Modification time */
217 __u32 i_dtime; /* Deletion Time */
218 __u16 i_gid; /* Low 16 bits of Group Id */
219 __u16 i_links_count; /* Links count */
220 __u32 i_blocks; /* Blocks count */
221 __u32 i_flags; /* File flags */
222 union {
223 struct {
224 __u32 l_i_reserved1;
225 } linux1;
226 struct {
227 __u32 h_i_translator;
228 } hurd1;
229 struct {
230 __u32 m_i_reserved1;
231 } masix1;
232 } osd1; /* OS dependent 1 */
233 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
234 __u32 i_generation; /* File version (for NFS) */
235 __u32 i_file_acl; /* File ACL */
236 __u32 i_dir_acl; /* Directory ACL */
237 __u32 i_faddr; /* Fragment address */
238 union {
239 struct {
240 __u8 l_i_frag; /* Fragment number */
241 __u8 l_i_fsize; /* Fragment size */
242 __u16 i_pad1;
243 __u16 l_i_uid_high; /* these 2 fields */
244 __u16 l_i_gid_high; /* were reserved2[0] */
245 __u32 l_i_reserved2;
246 } linux2;
247 struct {
248 __u8 h_i_frag; /* Fragment number */
249 __u8 h_i_fsize; /* Fragment size */
250 __u16 h_i_mode_high;
251 __u16 h_i_uid_high;
252 __u16 h_i_gid_high;
253 __u32 h_i_author;
254 } hurd2;
255 struct {
256 __u8 m_i_frag; /* Fragment number */
257 __u8 m_i_fsize; /* Fragment size */
258 __u16 m_pad1;
259 __u32 m_i_reserved2[2];
260 } masix2;
261 } osd2; /* OS dependent 2 */
262};
263
264/*
265 * Permanent part of an large inode on the disk
266 */
267struct ext2_inode_large {
268 __u16 i_mode; /* File mode */
269 __u16 i_uid; /* Low 16 bits of Owner Uid */
270 __u32 i_size; /* Size in bytes */
271 __u32 i_atime; /* Access time */
272 __u32 i_ctime; /* Creation time */
273 __u32 i_mtime; /* Modification time */
274 __u32 i_dtime; /* Deletion Time */
275 __u16 i_gid; /* Low 16 bits of Group Id */
276 __u16 i_links_count; /* Links count */
277 __u32 i_blocks; /* Blocks count */
278 __u32 i_flags; /* File flags */
279 union {
280 struct {
281 __u32 l_i_reserved1;
282 } linux1;
283 struct {
284 __u32 h_i_translator;
285 } hurd1;
286 struct {
287 __u32 m_i_reserved1;
288 } masix1;
289 } osd1; /* OS dependent 1 */
290 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
291 __u32 i_generation; /* File version (for NFS) */
292 __u32 i_file_acl; /* File ACL */
293 __u32 i_dir_acl; /* Directory ACL */
294 __u32 i_faddr; /* Fragment address */
295 union {
296 struct {
297 __u8 l_i_frag; /* Fragment number */
298 __u8 l_i_fsize; /* Fragment size */
299 __u16 i_pad1;
300 __u16 l_i_uid_high; /* these 2 fields */
301 __u16 l_i_gid_high; /* were reserved2[0] */
302 __u32 l_i_reserved2;
303 } linux2;
304 struct {
305 __u8 h_i_frag; /* Fragment number */
306 __u8 h_i_fsize; /* Fragment size */
307 __u16 h_i_mode_high;
308 __u16 h_i_uid_high;
309 __u16 h_i_gid_high;
310 __u32 h_i_author;
311 } hurd2;
312 struct {
313 __u8 m_i_frag; /* Fragment number */
314 __u8 m_i_fsize; /* Fragment size */
315 __u16 m_pad1;
316 __u32 m_i_reserved2[2];
317 } masix2;
318 } osd2; /* OS dependent 2 */
319 __u16 i_extra_isize;
320 __u16 i_pad1;
321};
322
323#define i_size_high i_dir_acl
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 0x0001 /* Do mount-time checks */
335#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
336#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
337#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
338#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
339#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
340#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
341#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
342
343#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
344#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
345#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
346 EXT2_MOUNT_##opt)
347/*
348 * Maximal mount counts between two filesystem checks
349 */
350#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
351#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
352
353/*
354 * Behaviour when detecting errors
355 */
356#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
357#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
358#define EXT2_ERRORS_PANIC 3 /* Panic */
359#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
360
361/*
362 * Structure of the super block
363 */
364struct ext2_super_block {
365 __u32 s_inodes_count; /* Inodes count */
366 __u32 s_blocks_count; /* Blocks count */
367 __u32 s_r_blocks_count; /* Reserved blocks count */
368 __u32 s_free_blocks_count; /* Free blocks count */
369 __u32 s_free_inodes_count; /* Free inodes count */
370 __u32 s_first_data_block; /* First Data Block */
371 __u32 s_log_block_size; /* Block size */
372 __s32 s_log_frag_size; /* Fragment size */
373 __u32 s_blocks_per_group; /* # Blocks per group */
374 __u32 s_frags_per_group; /* # Fragments per group */
375 __u32 s_inodes_per_group; /* # Inodes per group */
376 __u32 s_mtime; /* Mount time */
377 __u32 s_wtime; /* Write time */
378 __u16 s_mnt_count; /* Mount count */
379 __s16 s_max_mnt_count; /* Maximal mount count */
380 __u16 s_magic; /* Magic signature */
381 __u16 s_state; /* File system state */
382 __u16 s_errors; /* Behaviour when detecting errors */
383 __u16 s_minor_rev_level; /* minor revision level */
384 __u32 s_lastcheck; /* time of last check */
385 __u32 s_checkinterval; /* max. time between checks */
386 __u32 s_creator_os; /* OS */
387 __u32 s_rev_level; /* Revision level */
388 __u16 s_def_resuid; /* Default uid for reserved blocks */
389 __u16 s_def_resgid; /* Default gid for reserved blocks */
390 /*
391 * These fields are for EXT2_DYNAMIC_REV superblocks only.
392 *
393 * Note: the difference between the compatible feature set and
394 * the incompatible feature set is that if there is a bit set
395 * in the incompatible feature set that the kernel doesn't
396 * know about, it should refuse to mount the filesystem.
397 *
398 * e2fsck's requirements are more strict; if it doesn't know
399 * about a feature in either the compatible or incompatible
400 * feature set, it must abort and not try to meddle with
401 * things it doesn't understand...
402 */
403 __u32 s_first_ino; /* First non-reserved inode */
404 __u16 s_inode_size; /* size of inode structure */
405 __u16 s_block_group_nr; /* block group # of this superblock */
406 __u32 s_feature_compat; /* compatible feature set */
407 __u32 s_feature_incompat; /* incompatible feature set */
408 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
409 __u8 s_uuid[16]; /* 128-bit uuid for volume */
410 char s_volume_name[16]; /* volume name */
411 char s_last_mounted[64]; /* directory where last mounted */
412 __u32 s_algorithm_usage_bitmap; /* For compression */
413 /*
414 * Performance hints. Directory preallocation should only
415 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
416 */
417 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
418 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
419 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */
420 /*
421 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
422 */
423 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
424 __u32 s_journal_inum; /* inode number of journal file */
425 __u32 s_journal_dev; /* device number of journal file */
426 __u32 s_last_orphan; /* start of list of inodes to delete */
427 __u32 s_hash_seed[4]; /* HTREE hash seed */
428 __u8 s_def_hash_version; /* Default hash version to use */
429 __u8 s_jnl_backup_type; /* Default type of journal backup */
430 __u16 s_reserved_word_pad;
431 __u32 s_default_mount_opts;
432 __u32 s_first_meta_bg; /* First metablock group */
433 __u32 s_mkfs_time; /* When the filesystem was created */
434 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
435 __u32 s_reserved[172]; /* Padding to the end of the block */
436};
437
438/*
439 * Codes for operating systems
440 */
441#define EXT2_OS_LINUX 0
442#define EXT2_OS_HURD 1
443#define EXT2_OS_MASIX 2
444#define EXT2_OS_FREEBSD 3
445#define EXT2_OS_LITES 4
446
447/*
448 * Revision levels
449 */
450#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
451#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
452
453#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
454#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
455
456#define EXT2_GOOD_OLD_INODE_SIZE 128
457
458/*
459 * Journal inode backup types
460 */
461#define EXT3_JNL_BACKUP_BLOCKS 1
462
463/*
464 * Feature set definitions
465 */
466
467#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
468 ( EXT2_SB(sb)->s_feature_compat & (mask) )
469#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
470 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
471#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
472 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
473
474#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
475#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
476#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
477#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
478#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
479#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
480
481#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
482#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
483/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
484
485#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
486#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
487#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
488#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
489#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
490#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
491
492
493#define EXT2_FEATURE_COMPAT_SUPP 0
494#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
495#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
496 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
497 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
498
499/*
500 * Default values for user and/or group using reserved blocks
501 */
502#define EXT2_DEF_RESUID 0
503#define EXT2_DEF_RESGID 0
504
505/*
506 * Default mount options
507 */
508#define EXT2_DEFM_DEBUG 0x0001
509#define EXT2_DEFM_BSDGROUPS 0x0002
510#define EXT2_DEFM_XATTR_USER 0x0004
511#define EXT2_DEFM_ACL 0x0008
512#define EXT2_DEFM_UID16 0x0010
513#define EXT3_DEFM_JMODE 0x0060
514#define EXT3_DEFM_JMODE_DATA 0x0020
515#define EXT3_DEFM_JMODE_ORDERED 0x0040
516#define EXT3_DEFM_JMODE_WBACK 0x0060
517
518/*
519 * Structure of a directory entry
520 */
521#define EXT2_NAME_LEN 255
522
523struct ext2_dir_entry {
524 __u32 inode; /* Inode number */
525 __u16 rec_len; /* Directory entry length */
526 __u16 name_len; /* Name length */
527 char name[EXT2_NAME_LEN]; /* File name */
528};
529
530/*
531 * The new version of the directory entry. Since EXT2 structures are
532 * stored in intel byte order, and the name_len field could never be
533 * bigger than 255 chars, it's safe to reclaim the extra byte for the
534 * file_type field.
535 */
536struct ext2_dir_entry_2 {
537 __u32 inode; /* Inode number */
538 __u16 rec_len; /* Directory entry length */
539 __u8 name_len; /* Name length */
540 __u8 file_type;
541 char name[EXT2_NAME_LEN]; /* File name */
542};
543
544/*
545 * Ext2 directory file types. Only the low 3 bits are used. The
546 * other bits are reserved for now.
547 */
548#define EXT2_FT_UNKNOWN 0
549#define EXT2_FT_REG_FILE 1
550#define EXT2_FT_DIR 2
551#define EXT2_FT_CHRDEV 3
552#define EXT2_FT_BLKDEV 4
553#define EXT2_FT_FIFO 5
554#define EXT2_FT_SOCK 6
555#define EXT2_FT_SYMLINK 7
556
557#define EXT2_FT_MAX 8
558
559/*
560 * EXT2_DIR_PAD defines the directory entries boundaries
561 *
562 * NOTE: It must be a multiple of 4
563 */
564#define EXT2_DIR_PAD 4
565#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
566#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
567 ~EXT2_DIR_ROUND)
568
Denis Vlasenkof81e8db2009-04-09 12:35:13 +0000569#endif