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 <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 * Debug code
44 */
45 #ifdef EXT2FS_DEBUG
46 # define ext2_debug(f, a...) { \
47 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
48 __FILE__, __LINE__, __FUNCTION__); \
49 printk (f, ## a); \
50 }
51 #else
52 # define ext2_debug(f, a...) /**/
53 #endif
54
55 /*
56 * Special inode numbers
57 */
58 #define EXT2_BAD_INO 1 /* Bad blocks inode */
59 #define EXT2_ROOT_INO 2 /* Root inode */
60 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
61 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
62
63 /* First non-reserved inode for old ext2 filesystems */
64 #define EXT2_GOOD_OLD_FIRST_INO 11
65
66 /*
67 * The second extended file system magic number
68 */
69 #define EXT2_SUPER_MAGIC 0xEF53
70
71 #ifdef __KERNEL__
72 #include <linux/ext2_fs_sb.h>
EXT2_SB(struct super_block * sb)73 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
74 {
75 return sb->s_fs_info;
76 }
77 #else
78 /* Assume that user mode programs are passing in an ext2fs superblock, not
79 * a kernel struct super_block. This will allow us to call the feature-test
80 * macros from user land. */
81 #define EXT2_SB(sb) (sb)
82 #endif
83
84 /*
85 * Maximal count of links to a file
86 */
87 #define EXT2_LINK_MAX 32000
88
89 /*
90 * Macro-instructions used to manage several block sizes
91 */
92 #define EXT2_MIN_BLOCK_SIZE 1024
93 #define EXT2_MAX_BLOCK_SIZE 4096
94 #define EXT2_MIN_BLOCK_LOG_SIZE 10
95 #ifdef __KERNEL__
96 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
97 #else
98 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
99 #endif
100 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
101 #ifdef __KERNEL__
102 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
103 #else
104 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
105 #endif
106 #ifdef __KERNEL__
107 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
108 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
109 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
110 #else
111 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
112 EXT2_GOOD_OLD_INODE_SIZE : \
113 (s)->s_inode_size)
114 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
115 EXT2_GOOD_OLD_FIRST_INO : \
116 (s)->s_first_ino)
117 #endif
118
119 /*
120 * Macro-instructions used to manage fragments
121 */
122 #define EXT2_MIN_FRAG_SIZE 1024
123 #define EXT2_MAX_FRAG_SIZE 4096
124 #define EXT2_MIN_FRAG_LOG_SIZE 10
125 #ifdef __KERNEL__
126 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
127 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
128 #else
129 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
130 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
131 #endif
132
133 /*
134 * Structure of a blocks group descriptor
135 */
136 struct ext2_group_desc
137 {
138 __le32 bg_block_bitmap; /* Blocks bitmap block */
139 __le32 bg_inode_bitmap; /* Inodes bitmap block */
140 __le32 bg_inode_table; /* Inodes table block */
141 __le16 bg_free_blocks_count; /* Free blocks count */
142 __le16 bg_free_inodes_count; /* Free inodes count */
143 __le16 bg_used_dirs_count; /* Directories count */
144 __le16 bg_pad;
145 __le32 bg_reserved[3];
146 };
147
148 /*
149 * Macro-instructions used to manage group descriptors
150 */
151 #ifdef __KERNEL__
152 # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
153 # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
154 # define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
155 # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
156 #else
157 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
158 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
159 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
160 #endif
161
162 /*
163 * Constants relative to the data blocks
164 */
165 #define EXT2_NDIR_BLOCKS 12
166 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
167 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
168 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
169 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
170
171 /*
172 * Inode flags
173 */
174 #define EXT2_SECRM_FL 0x00000001 /* Secure deletion */
175 #define EXT2_UNRM_FL 0x00000002 /* Undelete */
176 #define EXT2_COMPR_FL 0x00000004 /* Compress file */
177 #define EXT2_SYNC_FL 0x00000008 /* Synchronous updates */
178 #define EXT2_IMMUTABLE_FL 0x00000010 /* Immutable file */
179 #define EXT2_APPEND_FL 0x00000020 /* writes to file may only append */
180 #define EXT2_NODUMP_FL 0x00000040 /* do not dump file */
181 #define EXT2_NOATIME_FL 0x00000080 /* do not update atime */
182 /* Reserved for compression usage... */
183 #define EXT2_DIRTY_FL 0x00000100
184 #define EXT2_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
185 #define EXT2_NOCOMP_FL 0x00000400 /* Don't compress */
186 #define EXT2_ECOMPR_FL 0x00000800 /* Compression error */
187 /* End compression flags --- maybe not all used */
188 #define EXT2_BTREE_FL 0x00001000 /* btree format dir */
189 #define EXT2_INDEX_FL 0x00001000 /* hash-indexed directory */
190 #define EXT2_IMAGIC_FL 0x00002000 /* AFS directory */
191 #define EXT2_JOURNAL_DATA_FL 0x00004000 /* Reserved for ext3 */
192 #define EXT2_NOTAIL_FL 0x00008000 /* file tail should not be merged */
193 #define EXT2_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
194 #define EXT2_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
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 0x000380FF /* 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 */
211 struct ext2_inode {
212 __le16 i_mode; /* File mode */
213 __le16 i_uid; /* Low 16 bits of Owner Uid */
214 __le32 i_size; /* Size in bytes */
215 __le32 i_atime; /* Access time */
216 __le32 i_ctime; /* Creation time */
217 __le32 i_mtime; /* Modification time */
218 __le32 i_dtime; /* Deletion Time */
219 __le16 i_gid; /* Low 16 bits of Group Id */
220 __le16 i_links_count; /* Links count */
221 __le32 i_blocks; /* Blocks count */
222 __le32 i_flags; /* File flags */
223 union {
224 struct {
225 __le32 l_i_reserved1;
226 } linux1;
227 struct {
228 __le32 h_i_translator;
229 } hurd1;
230 struct {
231 __le32 m_i_reserved1;
232 } masix1;
233 } osd1; /* OS dependent 1 */
234 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
235 __le32 i_generation; /* File version (for NFS) */
236 __le32 i_file_acl; /* File ACL */
237 __le32 i_dir_acl; /* Directory ACL */
238 __le32 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 __le16 l_i_uid_high; /* these 2 fields */
245 __le16 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 __le16 h_i_mode_high;
252 __le16 h_i_uid_high;
253 __le16 h_i_gid_high;
254 __le32 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 #define i_size_high i_dir_acl
266
267 #if defined(__KERNEL__) || defined(__linux__)
268 #define i_reserved1 osd1.linux1.l_i_reserved1
269 #define i_frag osd2.linux2.l_i_frag
270 #define i_fsize osd2.linux2.l_i_fsize
271 #define i_uid_low i_uid
272 #define i_gid_low i_gid
273 #define i_uid_high osd2.linux2.l_i_uid_high
274 #define i_gid_high osd2.linux2.l_i_gid_high
275 #define i_reserved2 osd2.linux2.l_i_reserved2
276 #endif
277
278 #ifdef __hurd__
279 #define i_translator osd1.hurd1.h_i_translator
280 #define i_frag osd2.hurd2.h_i_frag;
281 #define i_fsize osd2.hurd2.h_i_fsize;
282 #define i_uid_high osd2.hurd2.h_i_uid_high
283 #define i_gid_high osd2.hurd2.h_i_gid_high
284 #define i_author osd2.hurd2.h_i_author
285 #endif
286
287 #ifdef __masix__
288 #define i_reserved1 osd1.masix1.m_i_reserved1
289 #define i_frag osd2.masix2.m_i_frag
290 #define i_fsize osd2.masix2.m_i_fsize
291 #define i_reserved2 osd2.masix2.m_i_reserved2
292 #endif
293
294 /*
295 * File system states
296 */
297 #define EXT2_VALID_FS 0x0001 /* Unmounted cleanly */
298 #define EXT2_ERROR_FS 0x0002 /* Errors detected */
299
300 /*
301 * Mount flags
302 */
303 #define EXT2_MOUNT_CHECK 0x000001 /* Do mount-time checks */
304 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
305 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
306 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
307 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
308 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
309 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
310 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
311 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
312 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
313 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
314 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
315 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
316 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
317 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
318
319
320 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
321 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
322 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
323 EXT2_MOUNT_##opt)
324 /*
325 * Maximal mount counts between two filesystem checks
326 */
327 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
328 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
329
330 /*
331 * Behaviour when detecting errors
332 */
333 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
334 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
335 #define EXT2_ERRORS_PANIC 3 /* Panic */
336 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
337
338 /*
339 * Structure of the super block
340 */
341 struct ext2_super_block {
342 __le32 s_inodes_count; /* Inodes count */
343 __le32 s_blocks_count; /* Blocks count */
344 __le32 s_r_blocks_count; /* Reserved blocks count */
345 __le32 s_free_blocks_count; /* Free blocks count */
346 __le32 s_free_inodes_count; /* Free inodes count */
347 __le32 s_first_data_block; /* First Data Block */
348 __le32 s_log_block_size; /* Block size */
349 __le32 s_log_frag_size; /* Fragment size */
350 __le32 s_blocks_per_group; /* # Blocks per group */
351 __le32 s_frags_per_group; /* # Fragments per group */
352 __le32 s_inodes_per_group; /* # Inodes per group */
353 __le32 s_mtime; /* Mount time */
354 __le32 s_wtime; /* Write time */
355 __le16 s_mnt_count; /* Mount count */
356 __le16 s_max_mnt_count; /* Maximal mount count */
357 __le16 s_magic; /* Magic signature */
358 __le16 s_state; /* File system state */
359 __le16 s_errors; /* Behaviour when detecting errors */
360 __le16 s_minor_rev_level; /* minor revision level */
361 __le32 s_lastcheck; /* time of last check */
362 __le32 s_checkinterval; /* max. time between checks */
363 __le32 s_creator_os; /* OS */
364 __le32 s_rev_level; /* Revision level */
365 __le16 s_def_resuid; /* Default uid for reserved blocks */
366 __le16 s_def_resgid; /* Default gid for reserved blocks */
367 /*
368 * These fields are for EXT2_DYNAMIC_REV superblocks only.
369 *
370 * Note: the difference between the compatible feature set and
371 * the incompatible feature set is that if there is a bit set
372 * in the incompatible feature set that the kernel doesn't
373 * know about, it should refuse to mount the filesystem.
374 *
375 * e2fsck's requirements are more strict; if it doesn't know
376 * about a feature in either the compatible or incompatible
377 * feature set, it must abort and not try to meddle with
378 * things it doesn't understand...
379 */
380 __le32 s_first_ino; /* First non-reserved inode */
381 __le16 s_inode_size; /* size of inode structure */
382 __le16 s_block_group_nr; /* block group # of this superblock */
383 __le32 s_feature_compat; /* compatible feature set */
384 __le32 s_feature_incompat; /* incompatible feature set */
385 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
386 __u8 s_uuid[16]; /* 128-bit uuid for volume */
387 char s_volume_name[16]; /* volume name */
388 char s_last_mounted[64]; /* directory where last mounted */
389 __le32 s_algorithm_usage_bitmap; /* For compression */
390 /*
391 * Performance hints. Directory preallocation should only
392 * happen if the EXT2_COMPAT_PREALLOC flag is on.
393 */
394 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
395 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
396 __u16 s_padding1;
397 /*
398 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
399 */
400 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
401 __u32 s_journal_inum; /* inode number of journal file */
402 __u32 s_journal_dev; /* device number of journal file */
403 __u32 s_last_orphan; /* start of list of inodes to delete */
404 __u32 s_hash_seed[4]; /* HTREE hash seed */
405 __u8 s_def_hash_version; /* Default hash version to use */
406 __u8 s_reserved_char_pad;
407 __u16 s_reserved_word_pad;
408 __le32 s_default_mount_opts;
409 __le32 s_first_meta_bg; /* First metablock block group */
410 __u32 s_reserved[190]; /* Padding to the end of the block */
411 };
412
413 /*
414 * Codes for operating systems
415 */
416 #define EXT2_OS_LINUX 0
417 #define EXT2_OS_HURD 1
418 #define EXT2_OS_MASIX 2
419 #define EXT2_OS_FREEBSD 3
420 #define EXT2_OS_LITES 4
421
422 /*
423 * Revision levels
424 */
425 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
426 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
427
428 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
429 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
430
431 #define EXT2_GOOD_OLD_INODE_SIZE 128
432
433 /*
434 * Feature set definitions
435 */
436
437 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
438 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
439 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
440 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
441 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
442 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
443 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
444 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
445 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
446 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
447 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
448 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
449 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
450 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
451 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
452 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
453 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
454 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
455
456 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
457 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
458 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
459 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
460 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
461 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
462 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
463
464 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
465 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
466 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
467 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
468
469 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
470 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
471 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
472 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
473 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
474 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
475
476 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
477 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
478 EXT2_FEATURE_INCOMPAT_META_BG)
479 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
480 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
481 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
482 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
483 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
484
485 /*
486 * Default values for user and/or group using reserved blocks
487 */
488 #define EXT2_DEF_RESUID 0
489 #define EXT2_DEF_RESGID 0
490
491 /*
492 * Default mount options
493 */
494 #define EXT2_DEFM_DEBUG 0x0001
495 #define EXT2_DEFM_BSDGROUPS 0x0002
496 #define EXT2_DEFM_XATTR_USER 0x0004
497 #define EXT2_DEFM_ACL 0x0008
498 #define EXT2_DEFM_UID16 0x0010
499 /* Not used by ext2, but reserved for use by ext3 */
500 #define EXT3_DEFM_JMODE 0x0060
501 #define EXT3_DEFM_JMODE_DATA 0x0020
502 #define EXT3_DEFM_JMODE_ORDERED 0x0040
503 #define EXT3_DEFM_JMODE_WBACK 0x0060
504
505 /*
506 * Structure of a directory entry
507 */
508 #define EXT2_NAME_LEN 255
509
510 struct ext2_dir_entry {
511 __le32 inode; /* Inode number */
512 __le16 rec_len; /* Directory entry length */
513 __le16 name_len; /* Name length */
514 char name[EXT2_NAME_LEN]; /* File name */
515 };
516
517 /*
518 * The new version of the directory entry. Since EXT2 structures are
519 * stored in intel byte order, and the name_len field could never be
520 * bigger than 255 chars, it's safe to reclaim the extra byte for the
521 * file_type field.
522 */
523 struct ext2_dir_entry_2 {
524 __le32 inode; /* Inode number */
525 __le16 rec_len; /* Directory entry length */
526 __u8 name_len; /* Name length */
527 __u8 file_type;
528 char name[EXT2_NAME_LEN]; /* File name */
529 };
530
531 /*
532 * Ext2 directory file types. Only the low 3 bits are used. The
533 * other bits are reserved for now.
534 */
535 enum {
536 EXT2_FT_UNKNOWN,
537 EXT2_FT_REG_FILE,
538 EXT2_FT_DIR,
539 EXT2_FT_CHRDEV,
540 EXT2_FT_BLKDEV,
541 EXT2_FT_FIFO,
542 EXT2_FT_SOCK,
543 EXT2_FT_SYMLINK,
544 EXT2_FT_MAX
545 };
546
547 /*
548 * EXT2_DIR_PAD defines the directory entries boundaries
549 *
550 * NOTE: It must be a multiple of 4
551 */
552 #define EXT2_DIR_PAD 4
553 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
554 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
555 ~EXT2_DIR_ROUND)
556
557 #endif /* _LINUX_EXT2_FS_H */
558