Line data Source code
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>
70 : static inline struct ext2_sb_info *EXT2_SB(struct super_block *sb)
71 : {
72 232996 : return sb->s_fs_info;
73 : }
74 1 : #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_NODUMP_FL |\
200 : 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. */
211 : static inline __u32 ext2_mask_flags(umode_t mode, __u32 flags)
212 : {
213 40 : if (S_ISDIR(mode))
214 20 : return flags;
215 40 : else if (S_ISREG(mode))
216 20 : return flags & EXT2_REG_FLMASK;
217 : else
218 20 : return flags & EXT2_OTHER_FLMASK;
219 : }
220 9 :
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 1 :
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 1 :
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 1 : 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 */
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