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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 <ext2fs/ext2_types.h> /* Changed from linux/types.h */
20
21/*
22 * The second extended filesystem constants/structures
23 */
24
25/*
26 * Define EXT2FS_DEBUG to produce debug messages
27 */
28#undef EXT2FS_DEBUG
29
30/*
31 * Define EXT2_PREALLOCATE to preallocate data blocks for expanding files
32 */
33#define EXT2_PREALLOCATE
34#define EXT2_DEFAULT_PREALLOC_BLOCKS 8
35
36/*
37 * The second extended file system version
38 */
39#define EXT2FS_DATE "95/08/09"
40#define EXT2FS_VERSION "0.5b"
41
42/*
43 * Special inode numbers
44 */
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 */
53
54/* First non-reserved inode for old ext2 filesystems */
55#define EXT2_GOOD_OLD_FIRST_INO 11
56
57/*
58 * The second extended file system magic number
59 */
60#define EXT2_SUPER_MAGIC 0xEF53
61
62#ifdef __KERNEL__
63#define EXT2_SB(sb) (&((sb)->u.ext2_sb))
64#else
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)
69#endif
70
71/*
72 * Maximal count of links to a file
73 */
74#define EXT2_LINK_MAX 32000
75
76/*
77 * Macro-instructions used to manage several block sizes
78 */
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)
83#ifdef __KERNEL__
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)
89#else
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)
96#endif
97#define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof(__u32))
98
99/*
100 * Macro-instructions used to manage fragments
101 */
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
105#ifdef __KERNEL__
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)
108#else
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))
111#endif
112
113/*
114 * ACL structures
115 */
116struct ext2_acl_header /* Header of Access Control Lists */
117{
118 __u32 aclh_size;
119 __u32 aclh_file_count;
120 __u32 aclh_acle_count;
121 __u32 aclh_first_acle;
122};
123
124struct ext2_acl_entry /* Access Control List Entry */
125{
126 __u32 acle_size;
127 __u16 acle_perms; /* Access permissions */
128 __u16 acle_type; /* Type of entry */
129 __u16 acle_tag; /* User or group identity */
130 __u16 acle_pad1;
131 __u32 acle_next; /* Pointer on next entry for the */
132 /* same inode or on next free entry */
133};
134
135/*
136 * Structure of a blocks group descriptor
137 */
138struct ext2_group_desc
139{
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 */
146 __u16 bg_pad;
147 __u32 bg_reserved[3];
148};
149
150/*
151 * Data structures used by the directory indexing feature
152 *
153 * Note: all of the multibyte integer fields are little endian.
154 */
155
156/*
157 * Note: dx_root_info is laid out so that if it should somehow get
158 * overlaid by a dirent the two low bits of the hash version will be
159 * zero. Therefore, the hash version mod 4 should never be 0.
160 * Sincerely, the paranoia department.
161 */
162struct ext2_dx_root_info {
163 __u32 reserved_zero;
164 __u8 hash_version; /* 0 now, 1 at release */
165 __u8 info_length; /* 8 */
166 __u8 indirect_levels;
167 __u8 unused_flags;
168};
169
170#define EXT2_HASH_LEGACY 0
171#define EXT2_HASH_HALF_MD4 1
172#define EXT2_HASH_TEA 2
173
174#define EXT2_HASH_FLAG_INCOMPAT 0x1
175
176struct ext2_dx_entry {
177 __u32 hash;
178 __u32 block;
179};
180
181struct ext2_dx_countlimit {
182 __u16 limit;
183 __u16 count;
184};
185
186
187/*
188 * Macro-instructions used to manage group descriptors
189 */
190#define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
191#define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
192#define EXT2_INODES_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s)/EXT2_INODE_SIZE(s))
193/* limits imposed by 16-bit value gd_free_{blocks,inode}_count */
194#define EXT2_MAX_BLOCKS_PER_GROUP(s) ((1 << 16) - 8)
195#define EXT2_MAX_INODES_PER_GROUP(s) ((1 << 16) - EXT2_INODES_PER_BLOCK(s))
196#ifdef __KERNEL__
197#define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
198#define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
199#else
200#define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
201#endif
202
203/*
204 * Constants relative to the data blocks
205 */
206#define EXT2_NDIR_BLOCKS 12
207#define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
208#define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
209#define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
210#define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
211
212/*
213 * Inode flags
214 */
215#define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
216#define EXT2_UNRM_FL 0x00000002 /* Undelete */
217#define EXT2_COMPR_FL 0x00000004 /* Compress file */
218#define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
219#define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
220#define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
221#define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
222#define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
223/* Reserved for compression usage... */
224#define EXT2_DIRTY_FL 0x00000100
225#define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
226#define EXT2_NOCOMPR_FL 0x00000400 /* Access raw compressed data */
227#define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
228/* End compression flags --- maybe not all used */
229#define EXT2_BTREE_FL 0x00001000 /* btree format dir */
230#define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
231#define EXT2_IMAGIC_FL 0x00002000
232#define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
233#define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
234#define EXT2_DIRSYNC_FL 0x00010000 /* Synchronous directory modifications */
235#define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
236#define EXT3_EXTENTS_FL 0x00080000 /* Inode uses extents */
237#define EXT2_RESERVED_FL 0x80000000 /* reserved for ext2 lib */
238
239#define EXT2_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
240#define EXT2_FL_USER_MODIFIABLE 0x000080FF /* User modifiable flags */
241
242/*
243 * ioctl commands
244 */
245#define EXT2_IOC_GETFLAGS _IOR('f', 1, long)
246#define EXT2_IOC_SETFLAGS _IOW('f', 2, long)
247#define EXT2_IOC_GETVERSION _IOR('v', 1, long)
248#define EXT2_IOC_SETVERSION _IOW('v', 2, long)
249
250/*
251 * Structure of an inode on the disk
252 */
253struct ext2_inode {
254 __u16 i_mode; /* File mode */
255 __u16 i_uid; /* Low 16 bits of Owner Uid */
256 __u32 i_size; /* Size in bytes */
257 __u32 i_atime; /* Access time */
258 __u32 i_ctime; /* Creation time */
259 __u32 i_mtime; /* Modification time */
260 __u32 i_dtime; /* Deletion Time */
261 __u16 i_gid; /* Low 16 bits of Group Id */
262 __u16 i_links_count; /* Links count */
263 __u32 i_blocks; /* Blocks count */
264 __u32 i_flags; /* File flags */
265 union {
266 struct {
267 __u32 l_i_reserved1;
268 } linux1;
269 struct {
270 __u32 h_i_translator;
271 } hurd1;
272 struct {
273 __u32 m_i_reserved1;
274 } masix1;
275 } osd1; /* OS dependent 1 */
276 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
277 __u32 i_generation; /* File version (for NFS) */
278 __u32 i_file_acl; /* File ACL */
279 __u32 i_dir_acl; /* Directory ACL */
280 __u32 i_faddr; /* Fragment address */
281 union {
282 struct {
283 __u8 l_i_frag; /* Fragment number */
284 __u8 l_i_fsize; /* Fragment size */
285 __u16 i_pad1;
286 __u16 l_i_uid_high; /* these 2 fields */
287 __u16 l_i_gid_high; /* were reserved2[0] */
288 __u32 l_i_reserved2;
289 } linux2;
290 struct {
291 __u8 h_i_frag; /* Fragment number */
292 __u8 h_i_fsize; /* Fragment size */
293 __u16 h_i_mode_high;
294 __u16 h_i_uid_high;
295 __u16 h_i_gid_high;
296 __u32 h_i_author;
297 } hurd2;
298 struct {
299 __u8 m_i_frag; /* Fragment number */
300 __u8 m_i_fsize; /* Fragment size */
301 __u16 m_pad1;
302 __u32 m_i_reserved2[2];
303 } masix2;
304 } osd2; /* OS dependent 2 */
305};
306
307/*
308 * Permanent part of an large inode on the disk
309 */
310struct ext2_inode_large {
311 __u16 i_mode; /* File mode */
312 __u16 i_uid; /* Low 16 bits of Owner Uid */
313 __u32 i_size; /* Size in bytes */
314 __u32 i_atime; /* Access time */
315 __u32 i_ctime; /* Creation time */
316 __u32 i_mtime; /* Modification time */
317 __u32 i_dtime; /* Deletion Time */
318 __u16 i_gid; /* Low 16 bits of Group Id */
319 __u16 i_links_count; /* Links count */
320 __u32 i_blocks; /* Blocks count */
321 __u32 i_flags; /* File flags */
322 union {
323 struct {
324 __u32 l_i_reserved1;
325 } linux1;
326 struct {
327 __u32 h_i_translator;
328 } hurd1;
329 struct {
330 __u32 m_i_reserved1;
331 } masix1;
332 } osd1; /* OS dependent 1 */
333 __u32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
334 __u32 i_generation; /* File version (for NFS) */
335 __u32 i_file_acl; /* File ACL */
336 __u32 i_dir_acl; /* Directory ACL */
337 __u32 i_faddr; /* Fragment address */
338 union {
339 struct {
340 __u8 l_i_frag; /* Fragment number */
341 __u8 l_i_fsize; /* Fragment size */
342 __u16 i_pad1;
343 __u16 l_i_uid_high; /* these 2 fields */
344 __u16 l_i_gid_high; /* were reserved2[0] */
345 __u32 l_i_reserved2;
346 } linux2;
347 struct {
348 __u8 h_i_frag; /* Fragment number */
349 __u8 h_i_fsize; /* Fragment size */
350 __u16 h_i_mode_high;
351 __u16 h_i_uid_high;
352 __u16 h_i_gid_high;
353 __u32 h_i_author;
354 } hurd2;
355 struct {
356 __u8 m_i_frag; /* Fragment number */
357 __u8 m_i_fsize; /* Fragment size */
358 __u16 m_pad1;
359 __u32 m_i_reserved2[2];
360 } masix2;
361 } osd2; /* OS dependent 2 */
362 __u16 i_extra_isize;
363 __u16 i_pad1;
364};
365
366#define i_size_high i_dir_acl
367
368#if defined(__KERNEL__) || defined(__linux__)
369#define i_reserved1 osd1.linux1.l_i_reserved1
370#define i_frag osd2.linux2.l_i_frag
371#define i_fsize osd2.linux2.l_i_fsize
372#define i_uid_low i_uid
373#define i_gid_low i_gid
374#define i_uid_high osd2.linux2.l_i_uid_high
375#define i_gid_high osd2.linux2.l_i_gid_high
376#define i_reserved2 osd2.linux2.l_i_reserved2
377
378#else
379#if defined(__GNU__)
380
381#define i_translator osd1.hurd1.h_i_translator
382#define i_frag osd2.hurd2.h_i_frag;
383#define i_fsize osd2.hurd2.h_i_fsize;
384#define i_uid_high osd2.hurd2.h_i_uid_high
385#define i_gid_high osd2.hurd2.h_i_gid_high
386#define i_author osd2.hurd2.h_i_author
387
388#else
389#if defined(__masix__)
390
391#define i_reserved1 osd1.masix1.m_i_reserved1
392#define i_frag osd2.masix2.m_i_frag
393#define i_fsize osd2.masix2.m_i_fsize
394#define i_reserved2 osd2.masix2.m_i_reserved2
395
396#endif /* __masix__ */
397#endif /* __GNU__ */
398#endif /* defined(__KERNEL__) || defined(__linux__) */
399
400/*
401 * File system states
402 */
403#define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
404#define EXT2_ERROR_FS 0x0002 /* Errors detected */
405
406/*
407 * Mount flags
408 */
409#define EXT2_MOUNT_CHECK 0x0001 /* Do mount-time checks */
410#define EXT2_MOUNT_GRPID 0x0004 /* Create files with directory's group */
411#define EXT2_MOUNT_DEBUG 0x0008 /* Some debugging messages */
412#define EXT2_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
413#define EXT2_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
414#define EXT2_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
415#define EXT2_MOUNT_MINIX_DF 0x0080 /* Mimics the Minix statfs */
416#define EXT2_MOUNT_NO_UID32 0x0200 /* Disable 32-bit UIDs */
417
418#define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
419#define set_opt(o, opt) o |= EXT2_MOUNT_##opt
420#define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
421 EXT2_MOUNT_##opt)
422/*
423 * Maximal mount counts between two filesystem checks
424 */
425#define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
426#define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
427
428/*
429 * Behaviour when detecting errors
430 */
431#define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
432#define EXT2_ERRORS_RO 2 /* Remount fs read-only */
433#define EXT2_ERRORS_PANIC 3 /* Panic */
434#define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
435
436/*
437 * Structure of the super block
438 */
439struct ext2_super_block {
440 __u32 s_inodes_count; /* Inodes count */
441 __u32 s_blocks_count; /* Blocks count */
442 __u32 s_r_blocks_count; /* Reserved blocks count */
443 __u32 s_free_blocks_count; /* Free blocks count */
444 __u32 s_free_inodes_count; /* Free inodes count */
445 __u32 s_first_data_block; /* First Data Block */
446 __u32 s_log_block_size; /* Block size */
447 __s32 s_log_frag_size; /* Fragment size */
448 __u32 s_blocks_per_group; /* # Blocks per group */
449 __u32 s_frags_per_group; /* # Fragments per group */
450 __u32 s_inodes_per_group; /* # Inodes per group */
451 __u32 s_mtime; /* Mount time */
452 __u32 s_wtime; /* Write time */
453 __u16 s_mnt_count; /* Mount count */
454 __s16 s_max_mnt_count; /* Maximal mount count */
455 __u16 s_magic; /* Magic signature */
456 __u16 s_state; /* File system state */
457 __u16 s_errors; /* Behaviour when detecting errors */
458 __u16 s_minor_rev_level; /* minor revision level */
459 __u32 s_lastcheck; /* time of last check */
460 __u32 s_checkinterval; /* max. time between checks */
461 __u32 s_creator_os; /* OS */
462 __u32 s_rev_level; /* Revision level */
463 __u16 s_def_resuid; /* Default uid for reserved blocks */
464 __u16 s_def_resgid; /* Default gid for reserved blocks */
465 /*
466 * These fields are for EXT2_DYNAMIC_REV superblocks only.
467 *
468 * Note: the difference between the compatible feature set and
469 * the incompatible feature set is that if there is a bit set
470 * in the incompatible feature set that the kernel doesn't
471 * know about, it should refuse to mount the filesystem.
472 *
473 * e2fsck's requirements are more strict; if it doesn't know
474 * about a feature in either the compatible or incompatible
475 * feature set, it must abort and not try to meddle with
476 * things it doesn't understand...
477 */
478 __u32 s_first_ino; /* First non-reserved inode */
479 __u16 s_inode_size; /* size of inode structure */
480 __u16 s_block_group_nr; /* block group # of this superblock */
481 __u32 s_feature_compat; /* compatible feature set */
482 __u32 s_feature_incompat; /* incompatible feature set */
483 __u32 s_feature_ro_compat; /* readonly-compatible feature set */
484 __u8 s_uuid[16]; /* 128-bit uuid for volume */
485 char s_volume_name[16]; /* volume name */
486 char s_last_mounted[64]; /* directory where last mounted */
487 __u32 s_algorithm_usage_bitmap; /* For compression */
488 /*
489 * Performance hints. Directory preallocation should only
490 * happen if the EXT2_FEATURE_COMPAT_DIR_PREALLOC flag is on.
491 */
492 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
493 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
494 __u16 s_reserved_gdt_blocks; /* Per group table for online growth */
495 /*
496 * Journaling support valid if EXT2_FEATURE_COMPAT_HAS_JOURNAL set.
497 */
498 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
499 __u32 s_journal_inum; /* inode number of journal file */
500 __u32 s_journal_dev; /* device number of journal file */
501 __u32 s_last_orphan; /* start of list of inodes to delete */
502 __u32 s_hash_seed[4]; /* HTREE hash seed */
503 __u8 s_def_hash_version; /* Default hash version to use */
504 __u8 s_jnl_backup_type; /* Default type of journal backup */
505 __u16 s_reserved_word_pad;
506 __u32 s_default_mount_opts;
507 __u32 s_first_meta_bg; /* First metablock group */
508 __u32 s_mkfs_time; /* When the filesystem was created */
509 __u32 s_jnl_blocks[17]; /* Backup of the journal inode */
510 __u32 s_reserved[172]; /* Padding to the end of the block */
511};
512
513/*
514 * Codes for operating systems
515 */
516#define EXT2_OS_LINUX 0
517#define EXT2_OS_HURD 1
518#define EXT2_OS_MASIX 2
519#define EXT2_OS_FREEBSD 3
520#define EXT2_OS_LITES 4
521
522/*
523 * Revision levels
524 */
525#define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
526#define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
527
528#define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
529#define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
530
531#define EXT2_GOOD_OLD_INODE_SIZE 128
532
533/*
534 * Journal inode backup types
535 */
536#define EXT3_JNL_BACKUP_BLOCKS 1
537
538/*
539 * Feature set definitions
540 */
541
542#define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
543 ( EXT2_SB(sb)->s_feature_compat & (mask) )
544#define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
545 ( EXT2_SB(sb)->s_feature_ro_compat & (mask) )
546#define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
547 ( EXT2_SB(sb)->s_feature_incompat & (mask) )
548
549#define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
550#define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
551#define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
552#define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
553#define EXT2_FEATURE_COMPAT_RESIZE_INODE 0x0010
554#define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
555
556#define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
557#define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
558/* #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004 not used */
559
560#define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
561#define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
562#define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
563#define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
564#define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
565#define EXT3_FEATURE_INCOMPAT_EXTENTS 0x0040
566
567
568#define EXT2_FEATURE_COMPAT_SUPP 0
569#define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE)
570#define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
571 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
572 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
573
574/*
575 * Default values for user and/or group using reserved blocks
576 */
577#define EXT2_DEF_RESUID 0
578#define EXT2_DEF_RESGID 0
579
580/*
581 * Default mount options
582 */
583#define EXT2_DEFM_DEBUG 0x0001
584#define EXT2_DEFM_BSDGROUPS 0x0002
585#define EXT2_DEFM_XATTR_USER 0x0004
586#define EXT2_DEFM_ACL 0x0008
587#define EXT2_DEFM_UID16 0x0010
588#define EXT3_DEFM_JMODE 0x0060
589#define EXT3_DEFM_JMODE_DATA 0x0020
590#define EXT3_DEFM_JMODE_ORDERED 0x0040
591#define EXT3_DEFM_JMODE_WBACK 0x0060
592
593/*
594 * Structure of a directory entry
595 */
596#define EXT2_NAME_LEN 255
597
598struct ext2_dir_entry {
599 __u32 inode; /* Inode number */
600 __u16 rec_len; /* Directory entry length */
601 __u16 name_len; /* Name length */
602 char name[EXT2_NAME_LEN]; /* File name */
603};
604
605/*
606 * The new version of the directory entry. Since EXT2 structures are
607 * stored in intel byte order, and the name_len field could never be
608 * bigger than 255 chars, it's safe to reclaim the extra byte for the
609 * file_type field.
610 */
611struct ext2_dir_entry_2 {
612 __u32 inode; /* Inode number */
613 __u16 rec_len; /* Directory entry length */
614 __u8 name_len; /* Name length */
615 __u8 file_type;
616 char name[EXT2_NAME_LEN]; /* File name */
617};
618
619/*
620 * Ext2 directory file types. Only the low 3 bits are used. The
621 * other bits are reserved for now.
622 */
623#define EXT2_FT_UNKNOWN 0
624#define EXT2_FT_REG_FILE 1
625#define EXT2_FT_DIR 2
626#define EXT2_FT_CHRDEV 3
627#define EXT2_FT_BLKDEV 4
628#define EXT2_FT_FIFO 5
629#define EXT2_FT_SOCK 6
630#define EXT2_FT_SYMLINK 7
631
632#define EXT2_FT_MAX 8
633
634/*
635 * EXT2_DIR_PAD defines the directory entries boundaries
636 *
637 * NOTE: It must be a multiple of 4
638 */
639#define EXT2_DIR_PAD 4
640#define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
641#define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
642 ~EXT2_DIR_ROUND)
643
644#endif /* _LINUX_EXT2_FS_H */
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