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 #include <linux/magic.h>
21
22 /*
23 * The second extended filesystem constants/structures
24 */
25
26 /*
27 * Define EXT2FS_DEBUG to produce debug messages
28 */
29 #undef EXT2FS_DEBUG
30
31 /*
32 * Define EXT2_RESERVATION to reserve data blocks for expanding files
33 */
34 #define EXT2_DEFAULT_RESERVE_BLOCKS 8
35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
36 #define EXT2_MAX_RESERVE_BLOCKS 1027
37 #define EXT2_RESERVE_WINDOW_NOT_ALLOCATED 0
38 /*
39 * The second extended file system version
40 */
41 #define EXT2FS_DATE "95/08/09"
42 #define EXT2FS_VERSION "0.5b"
43
44 /*
45 * Debug code
46 */
47 #ifdef EXT2FS_DEBUG
48 # define ext2_debug(f, a...) { \
49 printk ("EXT2-fs DEBUG (%s, %d): %s:", \
50 __FILE__, __LINE__, __func__); \
51 printk (f, ## a); \
52 }
53 #else
54 # define ext2_debug(f, a...) /**/
55 #endif
56
57 /*
58 * Special inode numbers
59 */
60 #define EXT2_BAD_INO 1 /* Bad blocks inode */
61 #define EXT2_ROOT_INO 2 /* Root inode */
62 #define EXT2_BOOT_LOADER_INO 5 /* Boot loader inode */
63 #define EXT2_UNDEL_DIR_INO 6 /* Undelete directory inode */
64
65 /* First non-reserved inode for old ext2 filesystems */
66 #define EXT2_GOOD_OLD_FIRST_INO 11
67
68 #ifdef __KERNEL__
69 #include <linux/ext2_fs_sb.h>
EXT2_SB(struct super_block * sb)70 static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
71 {
72 return sb->s_fs_info;
73 }
74 #else
75 /* Assume that user mode programs are passing in an ext2fs superblock, not
76 * a kernel struct super_block. This will allow us to call the feature-test
77 * macros from user land. */
78 #define EXT2_SB(sb) (sb)
79 #endif
80
81 /*
82 * Maximal count of links to a file
83 */
84 #define EXT2_LINK_MAX 32000
85
86 /*
87 * Macro-instructions used to manage several block sizes
88 */
89 #define EXT2_MIN_BLOCK_SIZE 1024
90 #define EXT2_MAX_BLOCK_SIZE 4096
91 #define EXT2_MIN_BLOCK_LOG_SIZE 10
92 #ifdef __KERNEL__
93 # define EXT2_BLOCK_SIZE(s) ((s)->s_blocksize)
94 #else
95 # define EXT2_BLOCK_SIZE(s) (EXT2_MIN_BLOCK_SIZE << (s)->s_log_block_size)
96 #endif
97 #define EXT2_ADDR_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (__u32))
98 #ifdef __KERNEL__
99 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
100 #else
101 # define EXT2_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
102 #endif
103 #ifdef __KERNEL__
104 #define EXT2_ADDR_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_addr_per_block_bits)
105 #define EXT2_INODE_SIZE(s) (EXT2_SB(s)->s_inode_size)
106 #define EXT2_FIRST_INO(s) (EXT2_SB(s)->s_first_ino)
107 #else
108 #define EXT2_INODE_SIZE(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
109 EXT2_GOOD_OLD_INODE_SIZE : \
110 (s)->s_inode_size)
111 #define EXT2_FIRST_INO(s) (((s)->s_rev_level == EXT2_GOOD_OLD_REV) ? \
112 EXT2_GOOD_OLD_FIRST_INO : \
113 (s)->s_first_ino)
114 #endif
115
116 /*
117 * Macro-instructions used to manage fragments
118 */
119 #define EXT2_MIN_FRAG_SIZE 1024
120 #define EXT2_MAX_FRAG_SIZE 4096
121 #define EXT2_MIN_FRAG_LOG_SIZE 10
122 #ifdef __KERNEL__
123 # define EXT2_FRAG_SIZE(s) (EXT2_SB(s)->s_frag_size)
124 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_SB(s)->s_frags_per_block)
125 #else
126 # define EXT2_FRAG_SIZE(s) (EXT2_MIN_FRAG_SIZE << (s)->s_log_frag_size)
127 # define EXT2_FRAGS_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / EXT2_FRAG_SIZE(s))
128 #endif
129
130 /*
131 * Structure of a blocks group descriptor
132 */
133 struct ext2_group_desc
134 {
135 __le32 bg_block_bitmap; /* Blocks bitmap block */
136 __le32 bg_inode_bitmap; /* Inodes bitmap block */
137 __le32 bg_inode_table; /* Inodes table block */
138 __le16 bg_free_blocks_count; /* Free blocks count */
139 __le16 bg_free_inodes_count; /* Free inodes count */
140 __le16 bg_used_dirs_count; /* Directories count */
141 __le16 bg_pad;
142 __le32 bg_reserved[3];
143 };
144
145 /*
146 * Macro-instructions used to manage group descriptors
147 */
148 #ifdef __KERNEL__
149 # define EXT2_BLOCKS_PER_GROUP(s) (EXT2_SB(s)->s_blocks_per_group)
150 # define EXT2_DESC_PER_BLOCK(s) (EXT2_SB(s)->s_desc_per_block)
151 # define EXT2_INODES_PER_GROUP(s) (EXT2_SB(s)->s_inodes_per_group)
152 # define EXT2_DESC_PER_BLOCK_BITS(s) (EXT2_SB(s)->s_desc_per_block_bits)
153 #else
154 # define EXT2_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
155 # define EXT2_DESC_PER_BLOCK(s) (EXT2_BLOCK_SIZE(s) / sizeof (struct ext2_group_desc))
156 # define EXT2_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
157 #endif
158
159 /*
160 * Constants relative to the data blocks
161 */
162 #define EXT2_NDIR_BLOCKS 12
163 #define EXT2_IND_BLOCK EXT2_NDIR_BLOCKS
164 #define EXT2_DIND_BLOCK (EXT2_IND_BLOCK + 1)
165 #define EXT2_TIND_BLOCK (EXT2_DIND_BLOCK + 1)
166 #define EXT2_N_BLOCKS (EXT2_TIND_BLOCK + 1)
167
168 /*
169 * Inode flags (GETFLAGS/SETFLAGS)
170 */
171 #define EXT2_SECRM_FL FS_SECRM_FL /* Secure deletion */
172 #define EXT2_UNRM_FL FS_UNRM_FL /* Undelete */
173 #define EXT2_COMPR_FL FS_COMPR_FL /* Compress file */
174 #define EXT2_SYNC_FL FS_SYNC_FL /* Synchronous updates */
175 #define EXT2_IMMUTABLE_FL FS_IMMUTABLE_FL /* Immutable file */
176 #define EXT2_APPEND_FL FS_APPEND_FL /* writes to file may only append */
177 #define EXT2_NODUMP_FL FS_NODUMP_FL /* do not dump file */
178 #define EXT2_NOATIME_FL FS_NOATIME_FL /* do not update atime */
179 /* Reserved for compression usage... */
180 #define EXT2_DIRTY_FL FS_DIRTY_FL
181 #define EXT2_COMPRBLK_FL FS_COMPRBLK_FL /* One or more compressed clusters */
182 #define EXT2_NOCOMP_FL FS_NOCOMP_FL /* Don't compress */
183 #define EXT2_ECOMPR_FL FS_ECOMPR_FL /* Compression error */
184 /* End compression flags --- maybe not all used */
185 #define EXT2_BTREE_FL FS_BTREE_FL /* btree format dir */
186 #define EXT2_INDEX_FL FS_INDEX_FL /* hash-indexed directory */
187 #define EXT2_IMAGIC_FL FS_IMAGIC_FL /* AFS directory */
188 #define EXT2_JOURNAL_DATA_FL FS_JOURNAL_DATA_FL /* Reserved for ext3 */
189 #define EXT2_NOTAIL_FL FS_NOTAIL_FL /* file tail should not be merged */
190 #define EXT2_DIRSYNC_FL FS_DIRSYNC_FL /* dirsync behaviour (directories only) */
191 #define EXT2_TOPDIR_FL FS_TOPDIR_FL /* Top of directory hierarchies*/
192 #define EXT2_RESERVED_FL FS_RESERVED_FL /* reserved for ext2 lib */
193
194 #define EXT2_FL_USER_VISIBLE FS_FL_USER_VISIBLE /* User visible flags */
195 #define EXT2_FL_USER_MODIFIABLE FS_FL_USER_MODIFIABLE /* User modifiable flags */
196
197 /* Flags that should be inherited by new inodes from their parent. */
198 #define EXT2_FL_INHERITED (EXT2_SECRM_FL | EXT2_UNRM_FL | EXT2_COMPR_FL |\
199 EXT2_SYNC_FL | EXT2_IMMUTABLE_FL | EXT2_APPEND_FL |\
200 EXT2_NODUMP_FL | EXT2_NOATIME_FL | EXT2_COMPRBLK_FL|\
201 EXT2_NOCOMP_FL | EXT2_JOURNAL_DATA_FL |\
202 EXT2_NOTAIL_FL | EXT2_DIRSYNC_FL)
203
204 /* Flags that are appropriate for regular files (all but dir-specific ones). */
205 #define EXT2_REG_FLMASK (~(EXT2_DIRSYNC_FL | EXT2_TOPDIR_FL))
206
207 /* Flags that are appropriate for non-directories/regular files. */
208 #define EXT2_OTHER_FLMASK (EXT2_NODUMP_FL | EXT2_NOATIME_FL)
209
210 /* Mask out flags that are inappropriate for the given type of inode. */
ext2_mask_flags(umode_t mode,__u32 flags)211 static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
212 {
213 if (S_ISDIR(mode))
214 return flags;
215 else if (S_ISREG(mode))
216 return flags & EXT2_REG_FLMASK;
217 else
218 return flags & EXT2_OTHER_FLMASK;
219 }
220
221 /*
222 * ioctl commands
223 */
224 #define EXT2_IOC_GETFLAGS FS_IOC_GETFLAGS
225 #define EXT2_IOC_SETFLAGS FS_IOC_SETFLAGS
226 #define EXT2_IOC_GETVERSION FS_IOC_GETVERSION
227 #define EXT2_IOC_SETVERSION FS_IOC_SETVERSION
228 #define EXT2_IOC_GETRSVSZ _IOR('f', 5, long)
229 #define EXT2_IOC_SETRSVSZ _IOW('f', 6, long)
230
231 /*
232 * ioctl commands in 32 bit emulation
233 */
234 #define EXT2_IOC32_GETFLAGS FS_IOC32_GETFLAGS
235 #define EXT2_IOC32_SETFLAGS FS_IOC32_SETFLAGS
236 #define EXT2_IOC32_GETVERSION FS_IOC32_GETVERSION
237 #define EXT2_IOC32_SETVERSION FS_IOC32_SETVERSION
238
239 /*
240 * Structure of an inode on the disk
241 */
242 struct ext2_inode {
243 __le16 i_mode; /* File mode */
244 __le16 i_uid; /* Low 16 bits of Owner Uid */
245 __le32 i_size; /* Size in bytes */
246 __le32 i_atime; /* Access time */
247 __le32 i_ctime; /* Creation time */
248 __le32 i_mtime; /* Modification time */
249 __le32 i_dtime; /* Deletion Time */
250 __le16 i_gid; /* Low 16 bits of Group Id */
251 __le16 i_links_count; /* Links count */
252 __le32 i_blocks; /* Blocks count */
253 __le32 i_flags; /* File flags */
254 union {
255 struct {
256 __le32 l_i_reserved1;
257 } linux1;
258 struct {
259 __le32 h_i_translator;
260 } hurd1;
261 struct {
262 __le32 m_i_reserved1;
263 } masix1;
264 } osd1; /* OS dependent 1 */
265 __le32 i_block[EXT2_N_BLOCKS];/* Pointers to blocks */
266 __le32 i_generation; /* File version (for NFS) */
267 __le32 i_file_acl; /* File ACL */
268 __le32 i_dir_acl; /* Directory ACL */
269 __le32 i_faddr; /* Fragment address */
270 union {
271 struct {
272 __u8 l_i_frag; /* Fragment number */
273 __u8 l_i_fsize; /* Fragment size */
274 __u16 i_pad1;
275 __le16 l_i_uid_high; /* these 2 fields */
276 __le16 l_i_gid_high; /* were reserved2[0] */
277 __u32 l_i_reserved2;
278 } linux2;
279 struct {
280 __u8 h_i_frag; /* Fragment number */
281 __u8 h_i_fsize; /* Fragment size */
282 __le16 h_i_mode_high;
283 __le16 h_i_uid_high;
284 __le16 h_i_gid_high;
285 __le32 h_i_author;
286 } hurd2;
287 struct {
288 __u8 m_i_frag; /* Fragment number */
289 __u8 m_i_fsize; /* Fragment size */
290 __u16 m_pad1;
291 __u32 m_i_reserved2[2];
292 } masix2;
293 } osd2; /* OS dependent 2 */
294 };
295
296 #define i_size_high i_dir_acl
297
298 #if defined(__KERNEL__) || defined(__linux__)
299 #define i_reserved1 osd1.linux1.l_i_reserved1
300 #define i_frag osd2.linux2.l_i_frag
301 #define i_fsize osd2.linux2.l_i_fsize
302 #define i_uid_low i_uid
303 #define i_gid_low i_gid
304 #define i_uid_high osd2.linux2.l_i_uid_high
305 #define i_gid_high osd2.linux2.l_i_gid_high
306 #define i_reserved2 osd2.linux2.l_i_reserved2
307 #endif
308
309 #ifdef __hurd__
310 #define i_translator osd1.hurd1.h_i_translator
311 #define i_frag osd2.hurd2.h_i_frag
312 #define i_fsize osd2.hurd2.h_i_fsize
313 #define i_uid_high osd2.hurd2.h_i_uid_high
314 #define i_gid_high osd2.hurd2.h_i_gid_high
315 #define i_author osd2.hurd2.h_i_author
316 #endif
317
318 #ifdef __masix__
319 #define i_reserved1 osd1.masix1.m_i_reserved1
320 #define i_frag osd2.masix2.m_i_frag
321 #define i_fsize osd2.masix2.m_i_fsize
322 #define i_reserved2 osd2.masix2.m_i_reserved2
323 #endif
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 0x000001 /* Do mount-time checks */
335 #define EXT2_MOUNT_OLDALLOC 0x000002 /* Don't use the new Orlov allocator */
336 #define EXT2_MOUNT_GRPID 0x000004 /* Create files with directory's group */
337 #define EXT2_MOUNT_DEBUG 0x000008 /* Some debugging messages */
338 #define EXT2_MOUNT_ERRORS_CONT 0x000010 /* Continue on errors */
339 #define EXT2_MOUNT_ERRORS_RO 0x000020 /* Remount fs ro on errors */
340 #define EXT2_MOUNT_ERRORS_PANIC 0x000040 /* Panic on errors */
341 #define EXT2_MOUNT_MINIX_DF 0x000080 /* Mimics the Minix statfs */
342 #define EXT2_MOUNT_NOBH 0x000100 /* No buffer_heads */
343 #define EXT2_MOUNT_NO_UID32 0x000200 /* Disable 32-bit UIDs */
344 #define EXT2_MOUNT_XATTR_USER 0x004000 /* Extended user attributes */
345 #define EXT2_MOUNT_POSIX_ACL 0x008000 /* POSIX Access Control Lists */
346 #define EXT2_MOUNT_XIP 0x010000 /* Execute in place */
347 #define EXT2_MOUNT_USRQUOTA 0x020000 /* user quota */
348 #define EXT2_MOUNT_GRPQUOTA 0x040000 /* group quota */
349 #define EXT2_MOUNT_RESERVATION 0x080000 /* Preallocation */
350
351
352 #define clear_opt(o, opt) o &= ~EXT2_MOUNT_##opt
353 #define set_opt(o, opt) o |= EXT2_MOUNT_##opt
354 #define test_opt(sb, opt) (EXT2_SB(sb)->s_mount_opt & \
355 EXT2_MOUNT_##opt)
356 /*
357 * Maximal mount counts between two filesystem checks
358 */
359 #define EXT2_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
360 #define EXT2_DFL_CHECKINTERVAL 0 /* Don't use interval check */
361
362 /*
363 * Behaviour when detecting errors
364 */
365 #define EXT2_ERRORS_CONTINUE 1 /* Continue execution */
366 #define EXT2_ERRORS_RO 2 /* Remount fs read-only */
367 #define EXT2_ERRORS_PANIC 3 /* Panic */
368 #define EXT2_ERRORS_DEFAULT EXT2_ERRORS_CONTINUE
369
370 /*
371 * Structure of the super block
372 */
373 struct ext2_super_block {
374 __le32 s_inodes_count; /* Inodes count */
375 __le32 s_blocks_count; /* Blocks count */
376 __le32 s_r_blocks_count; /* Reserved blocks count */
377 __le32 s_free_blocks_count; /* Free blocks count */
378 __le32 s_free_inodes_count; /* Free inodes count */
379 __le32 s_first_data_block; /* First Data Block */
380 __le32 s_log_block_size; /* Block size */
381 __le32 s_log_frag_size; /* Fragment size */
382 __le32 s_blocks_per_group; /* # Blocks per group */
383 __le32 s_frags_per_group; /* # Fragments per group */
384 __le32 s_inodes_per_group; /* # Inodes per group */
385 __le32 s_mtime; /* Mount time */
386 __le32 s_wtime; /* Write time */
387 __le16 s_mnt_count; /* Mount count */
388 __le16 s_max_mnt_count; /* Maximal mount count */
389 __le16 s_magic; /* Magic signature */
390 __le16 s_state; /* File system state */
391 __le16 s_errors; /* Behaviour when detecting errors */
392 __le16 s_minor_rev_level; /* minor revision level */
393 __le32 s_lastcheck; /* time of last check */
394 __le32 s_checkinterval; /* max. time between checks */
395 __le32 s_creator_os; /* OS */
396 __le32 s_rev_level; /* Revision level */
397 __le16 s_def_resuid; /* Default uid for reserved blocks */
398 __le16 s_def_resgid; /* Default gid for reserved blocks */
399 /*
400 * These fields are for EXT2_DYNAMIC_REV superblocks only.
401 *
402 * Note: the difference between the compatible feature set and
403 * the incompatible feature set is that if there is a bit set
404 * in the incompatible feature set that the kernel doesn't
405 * know about, it should refuse to mount the filesystem.
406 *
407 * e2fsck's requirements are more strict; if it doesn't know
408 * about a feature in either the compatible or incompatible
409 * feature set, it must abort and not try to meddle with
410 * things it doesn't understand...
411 */
412 __le32 s_first_ino; /* First non-reserved inode */
413 __le16 s_inode_size; /* size of inode structure */
414 __le16 s_block_group_nr; /* block group # of this superblock */
415 __le32 s_feature_compat; /* compatible feature set */
416 __le32 s_feature_incompat; /* incompatible feature set */
417 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
418 __u8 s_uuid[16]; /* 128-bit uuid for volume */
419 char s_volume_name[16]; /* volume name */
420 char s_last_mounted[64]; /* directory where last mounted */
421 __le32 s_algorithm_usage_bitmap; /* For compression */
422 /*
423 * Performance hints. Directory preallocation should only
424 * happen if the EXT2_COMPAT_PREALLOC flag is on.
425 */
426 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
427 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
428 __u16 s_padding1;
429 /*
430 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
431 */
432 __u8 s_journal_uuid[16]; /* uuid of journal superblock */
433 __u32 s_journal_inum; /* inode number of journal file */
434 __u32 s_journal_dev; /* device number of journal file */
435 __u32 s_last_orphan; /* start of list of inodes to delete */
436 __u32 s_hash_seed[4]; /* HTREE hash seed */
437 __u8 s_def_hash_version; /* Default hash version to use */
438 __u8 s_reserved_char_pad;
439 __u16 s_reserved_word_pad;
440 __le32 s_default_mount_opts;
441 __le32 s_first_meta_bg; /* First metablock block group */
442 __u32 s_reserved[190]; /* Padding to the end of the block */
443 };
444
445 /*
446 * Codes for operating systems
447 */
448 #define EXT2_OS_LINUX 0
449 #define EXT2_OS_HURD 1
450 #define EXT2_OS_MASIX 2
451 #define EXT2_OS_FREEBSD 3
452 #define EXT2_OS_LITES 4
453
454 /*
455 * Revision levels
456 */
457 #define EXT2_GOOD_OLD_REV 0 /* The good old (original) format */
458 #define EXT2_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
459
460 #define EXT2_CURRENT_REV EXT2_GOOD_OLD_REV
461 #define EXT2_MAX_SUPP_REV EXT2_DYNAMIC_REV
462
463 #define EXT2_GOOD_OLD_INODE_SIZE 128
464
465 /*
466 * Feature set definitions
467 */
468
469 #define EXT2_HAS_COMPAT_FEATURE(sb,mask) \
470 ( EXT2_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
471 #define EXT2_HAS_RO_COMPAT_FEATURE(sb,mask) \
472 ( EXT2_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
473 #define EXT2_HAS_INCOMPAT_FEATURE(sb,mask) \
474 ( EXT2_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
475 #define EXT2_SET_COMPAT_FEATURE(sb,mask) \
476 EXT2_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
477 #define EXT2_SET_RO_COMPAT_FEATURE(sb,mask) \
478 EXT2_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
479 #define EXT2_SET_INCOMPAT_FEATURE(sb,mask) \
480 EXT2_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
481 #define EXT2_CLEAR_COMPAT_FEATURE(sb,mask) \
482 EXT2_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
483 #define EXT2_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
484 EXT2_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
485 #define EXT2_CLEAR_INCOMPAT_FEATURE(sb,mask) \
486 EXT2_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
487
488 #define EXT2_FEATURE_COMPAT_DIR_PREALLOC 0x0001
489 #define EXT2_FEATURE_COMPAT_IMAGIC_INODES 0x0002
490 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
491 #define EXT2_FEATURE_COMPAT_EXT_ATTR 0x0008
492 #define EXT2_FEATURE_COMPAT_RESIZE_INO 0x0010
493 #define EXT2_FEATURE_COMPAT_DIR_INDEX 0x0020
494 #define EXT2_FEATURE_COMPAT_ANY 0xffffffff
495
496 #define EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
497 #define EXT2_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
498 #define EXT2_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
499 #define EXT2_FEATURE_RO_COMPAT_ANY 0xffffffff
500
501 #define EXT2_FEATURE_INCOMPAT_COMPRESSION 0x0001
502 #define EXT2_FEATURE_INCOMPAT_FILETYPE 0x0002
503 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004
504 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008
505 #define EXT2_FEATURE_INCOMPAT_META_BG 0x0010
506 #define EXT2_FEATURE_INCOMPAT_ANY 0xffffffff
507
508 #define EXT2_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
509 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT2_FEATURE_INCOMPAT_FILETYPE| \
510 EXT2_FEATURE_INCOMPAT_META_BG)
511 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT2_FEATURE_RO_COMPAT_SPARSE_SUPER| \
512 EXT2_FEATURE_RO_COMPAT_LARGE_FILE| \
513 EXT2_FEATURE_RO_COMPAT_BTREE_DIR)
514 #define EXT2_FEATURE_RO_COMPAT_UNSUPPORTED ~EXT2_FEATURE_RO_COMPAT_SUPP
515 #define EXT2_FEATURE_INCOMPAT_UNSUPPORTED ~EXT2_FEATURE_INCOMPAT_SUPP
516
517 /*
518 * Default values for user and/or group using reserved blocks
519 */
520 #define EXT2_DEF_RESUID 0
521 #define EXT2_DEF_RESGID 0
522
523 /*
524 * Default mount options
525 */
526 #define EXT2_DEFM_DEBUG 0x0001
527 #define EXT2_DEFM_BSDGROUPS 0x0002
528 #define EXT2_DEFM_XATTR_USER 0x0004
529 #define EXT2_DEFM_ACL 0x0008
530 #define EXT2_DEFM_UID16 0x0010
531 /* Not used by ext2, but reserved for use by ext3 */
532 #define EXT3_DEFM_JMODE 0x0060
533 #define EXT3_DEFM_JMODE_DATA 0x0020
534 #define EXT3_DEFM_JMODE_ORDERED 0x0040
535 #define EXT3_DEFM_JMODE_WBACK 0x0060
536
537 /*
538 * Structure of a directory entry
539 */
540 #define EXT2_NAME_LEN 255
541
542 struct ext2_dir_entry {
543 __le32 inode; /* Inode number */
544 __le16 rec_len; /* Directory entry length */
545 __le16 name_len; /* Name length */
546 char name[EXT2_NAME_LEN]; /* File name */
547 };
548
549 /*
550 * The new version of the directory entry. Since EXT2 structures are
551 * stored in intel byte order, and the name_len field could never be
552 * bigger than 255 chars, it's safe to reclaim the extra byte for the
553 * file_type field.
554 */
555 struct ext2_dir_entry_2 {
556 __le32 inode; /* Inode number */
557 __le16 rec_len; /* Directory entry length */
558 __u8 name_len; /* Name length */
559 __u8 file_type;
560 char name[EXT2_NAME_LEN]; /* File name */
561 };
562
563 /*
564 * Ext2 directory file types. Only the low 3 bits are used. The
565 * other bits are reserved for now.
566 */
567 enum {
568 EXT2_FT_UNKNOWN = 0,
569 EXT2_FT_REG_FILE = 1,
570 EXT2_FT_DIR = 2,
571 EXT2_FT_CHRDEV = 3,
572 EXT2_FT_BLKDEV = 4,
573 EXT2_FT_FIFO = 5,
574 EXT2_FT_SOCK = 6,
575 EXT2_FT_SYMLINK = 7,
576 EXT2_FT_MAX
577 };
578
579 /*
580 * EXT2_DIR_PAD defines the directory entries boundaries
581 *
582 * NOTE: It must be a multiple of 4
583 */
584 #define EXT2_DIR_PAD 4
585 #define EXT2_DIR_ROUND (EXT2_DIR_PAD - 1)
586 #define EXT2_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT2_DIR_ROUND) & \
587 ~EXT2_DIR_ROUND)
588 #define EXT2_MAX_REC_LEN ((1<<16)-1)
589
590 #endif /* _LINUX_EXT2_FS_H */
591