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1 /*
2 * linux/include/linux/ext3_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_EXT3_FS_H
17 #define _LINUX_EXT3_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 EXT3FS_DEBUG to produce debug messages
28 */
29 #undef EXT3FS_DEBUG
30
31 /*
32 * Define EXT3_RESERVATION to reserve data blocks for expanding files
33 */
34 #define EXT3_DEFAULT_RESERVE_BLOCKS 8
35 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
36 #define EXT3_MAX_RESERVE_BLOCKS 1027
37 #define EXT3_RESERVE_WINDOW_NOT_ALLOCATED 0
38
39 /*
40 * Debug code
41 */
42 #ifdef EXT3FS_DEBUG
43 #define ext3_debug(f, a...) \
44 do { \
45 printk (KERN_DEBUG "EXT3-fs DEBUG (%s, %d): %s:", \
46 __FILE__, __LINE__, __func__); \
47 printk (KERN_DEBUG f, ## a); \
48 } while (0)
49 #else
50 #define ext3_debug(f, a...) do {} while (0)
51 #endif
52
53 /*
54 * Special inodes numbers
55 */
56 #define EXT3_BAD_INO 1 /* Bad blocks inode */
57 #define EXT3_ROOT_INO 2 /* Root inode */
58 #define EXT3_BOOT_LOADER_INO 5 /* Boot loader inode */
59 #define EXT3_UNDEL_DIR_INO 6 /* Undelete directory inode */
60 #define EXT3_RESIZE_INO 7 /* Reserved group descriptors inode */
61 #define EXT3_JOURNAL_INO 8 /* Journal inode */
62
63 /* First non-reserved inode for old ext3 filesystems */
64 #define EXT3_GOOD_OLD_FIRST_INO 11
65
66 /*
67 * Maximal count of links to a file
68 */
69 #define EXT3_LINK_MAX 32000
70
71 /*
72 * Macro-instructions used to manage several block sizes
73 */
74 #define EXT3_MIN_BLOCK_SIZE 1024
75 #define EXT3_MAX_BLOCK_SIZE 65536
76 #define EXT3_MIN_BLOCK_LOG_SIZE 10
77 #ifdef __KERNEL__
78 # define EXT3_BLOCK_SIZE(s) ((s)->s_blocksize)
79 #else
80 # define EXT3_BLOCK_SIZE(s) (EXT3_MIN_BLOCK_SIZE << (s)->s_log_block_size)
81 #endif
82 #define EXT3_ADDR_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (__u32))
83 #ifdef __KERNEL__
84 # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
85 #else
86 # define EXT3_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
87 #endif
88 #ifdef __KERNEL__
89 #define EXT3_ADDR_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_addr_per_block_bits)
90 #define EXT3_INODE_SIZE(s) (EXT3_SB(s)->s_inode_size)
91 #define EXT3_FIRST_INO(s) (EXT3_SB(s)->s_first_ino)
92 #else
93 #define EXT3_INODE_SIZE(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
94 EXT3_GOOD_OLD_INODE_SIZE : \
95 (s)->s_inode_size)
96 #define EXT3_FIRST_INO(s) (((s)->s_rev_level == EXT3_GOOD_OLD_REV) ? \
97 EXT3_GOOD_OLD_FIRST_INO : \
98 (s)->s_first_ino)
99 #endif
100
101 /*
102 * Macro-instructions used to manage fragments
103 */
104 #define EXT3_MIN_FRAG_SIZE 1024
105 #define EXT3_MAX_FRAG_SIZE 4096
106 #define EXT3_MIN_FRAG_LOG_SIZE 10
107 #ifdef __KERNEL__
108 # define EXT3_FRAG_SIZE(s) (EXT3_SB(s)->s_frag_size)
109 # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_SB(s)->s_frags_per_block)
110 #else
111 # define EXT3_FRAG_SIZE(s) (EXT3_MIN_FRAG_SIZE << (s)->s_log_frag_size)
112 # define EXT3_FRAGS_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / EXT3_FRAG_SIZE(s))
113 #endif
114
115 /*
116 * Structure of a blocks group descriptor
117 */
118 struct ext3_group_desc
119 {
120 __le32 bg_block_bitmap; /* Blocks bitmap block */
121 __le32 bg_inode_bitmap; /* Inodes bitmap block */
122 __le32 bg_inode_table; /* Inodes table block */
123 __le16 bg_free_blocks_count; /* Free blocks count */
124 __le16 bg_free_inodes_count; /* Free inodes count */
125 __le16 bg_used_dirs_count; /* Directories count */
126 __u16 bg_pad;
127 __le32 bg_reserved[3];
128 };
129
130 /*
131 * Macro-instructions used to manage group descriptors
132 */
133 #ifdef __KERNEL__
134 # define EXT3_BLOCKS_PER_GROUP(s) (EXT3_SB(s)->s_blocks_per_group)
135 # define EXT3_DESC_PER_BLOCK(s) (EXT3_SB(s)->s_desc_per_block)
136 # define EXT3_INODES_PER_GROUP(s) (EXT3_SB(s)->s_inodes_per_group)
137 # define EXT3_DESC_PER_BLOCK_BITS(s) (EXT3_SB(s)->s_desc_per_block_bits)
138 #else
139 # define EXT3_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
140 # define EXT3_DESC_PER_BLOCK(s) (EXT3_BLOCK_SIZE(s) / sizeof (struct ext3_group_desc))
141 # define EXT3_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
142 #endif
143
144 /*
145 * Constants relative to the data blocks
146 */
147 #define EXT3_NDIR_BLOCKS 12
148 #define EXT3_IND_BLOCK EXT3_NDIR_BLOCKS
149 #define EXT3_DIND_BLOCK (EXT3_IND_BLOCK + 1)
150 #define EXT3_TIND_BLOCK (EXT3_DIND_BLOCK + 1)
151 #define EXT3_N_BLOCKS (EXT3_TIND_BLOCK + 1)
152
153 /*
154 * Inode flags
155 */
156 #define EXT3_SECRM_FL 0x00000001 /* Secure deletion */
157 #define EXT3_UNRM_FL 0x00000002 /* Undelete */
158 #define EXT3_COMPR_FL 0x00000004 /* Compress file */
159 #define EXT3_SYNC_FL 0x00000008 /* Synchronous updates */
160 #define EXT3_IMMUTABLE_FL 0x00000010 /* Immutable file */
161 #define EXT3_APPEND_FL 0x00000020 /* writes to file may only append */
162 #define EXT3_NODUMP_FL 0x00000040 /* do not dump file */
163 #define EXT3_NOATIME_FL 0x00000080 /* do not update atime */
164 /* Reserved for compression usage... */
165 #define EXT3_DIRTY_FL 0x00000100
166 #define EXT3_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
167 #define EXT3_NOCOMPR_FL 0x00000400 /* Don't compress */
168 #define EXT3_ECOMPR_FL 0x00000800 /* Compression error */
169 /* End compression flags --- maybe not all used */
170 #define EXT3_INDEX_FL 0x00001000 /* hash-indexed directory */
171 #define EXT3_IMAGIC_FL 0x00002000 /* AFS directory */
172 #define EXT3_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
173 #define EXT3_NOTAIL_FL 0x00008000 /* file tail should not be merged */
174 #define EXT3_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
175 #define EXT3_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
176 #define EXT3_RESERVED_FL 0x80000000 /* reserved for ext3 lib */
177
178 #define EXT3_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
179 #define EXT3_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
180
181 /* Flags that should be inherited by new inodes from their parent. */
182 #define EXT3_FL_INHERITED (EXT3_SECRM_FL | EXT3_UNRM_FL | EXT3_COMPR_FL |\
183 EXT3_SYNC_FL | EXT3_NODUMP_FL |\
184 EXT3_NOATIME_FL | EXT3_COMPRBLK_FL |\
185 EXT3_NOCOMPR_FL | EXT3_JOURNAL_DATA_FL |\
186 EXT3_NOTAIL_FL | EXT3_DIRSYNC_FL)
187
188 /* Flags that are appropriate for regular files (all but dir-specific ones). */
189 #define EXT3_REG_FLMASK (~(EXT3_DIRSYNC_FL | EXT3_TOPDIR_FL))
190
191 /* Flags that are appropriate for non-directories/regular files. */
192 #define EXT3_OTHER_FLMASK (EXT3_NODUMP_FL | EXT3_NOATIME_FL)
193
194 /* Mask out flags that are inappropriate for the given type of inode. */
195 typedef unsigned short umode_t;
196 static inline __u32 ext3_mask_flags(umode_t mode, __u32 flags)
197 {
198 if (S_ISDIR(mode))
199 return flags;
200 else if (S_ISREG(mode))
201 return flags & EXT3_REG_FLMASK;
202 else
203 return flags & EXT3_OTHER_FLMASK;
204 }
205
206 /* Used to pass group descriptor data when online resize is done */
207 struct ext3_new_group_input {
208 __u32 group; /* Group number for this data */
209 __u32 block_bitmap; /* Absolute block number of block bitmap */
210 __u32 inode_bitmap; /* Absolute block number of inode bitmap */
211 __u32 inode_table; /* Absolute block number of inode table start */
212 __u32 blocks_count; /* Total number of blocks in this group */
213 __u16 reserved_blocks; /* Number of reserved blocks in this group */
214 __u16 unused;
215 };
216
217 /* The struct ext3_new_group_input in kernel space, with free_blocks_count */
218 struct ext3_new_group_data {
219 __u32 group;
220 __u32 block_bitmap;
221 __u32 inode_bitmap;
222 __u32 inode_table;
223 __u32 blocks_count;
224 __u16 reserved_blocks;
225 __u16 unused;
226 __u32 free_blocks_count;
227 };
228
229
230 /*
231 * ioctl commands
232 */
233 #define EXT3_IOC_GETFLAGS FS_IOC_GETFLAGS
234 #define EXT3_IOC_SETFLAGS FS_IOC_SETFLAGS
235 #define EXT3_IOC_GETVERSION _IOR('f', 3, long)
236 #define EXT3_IOC_SETVERSION _IOW('f', 4, long)
237 #define EXT3_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
238 #define EXT3_IOC_GROUP_ADD _IOW('f', 8,struct ext3_new_group_input)
239 #define EXT3_IOC_GETVERSION_OLD FS_IOC_GETVERSION
240 #define EXT3_IOC_SETVERSION_OLD FS_IOC_SETVERSION
241 #ifdef CONFIG_JBD_DEBUG
242 #define EXT3_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
243 #endif
244 #define EXT3_IOC_GETRSVSZ _IOR('f', 5, long)
245 #define EXT3_IOC_SETRSVSZ _IOW('f', 6, long)
246
247 /*
248 * ioctl commands in 32 bit emulation
249 */
250 #define EXT3_IOC32_GETFLAGS FS_IOC32_GETFLAGS
251 #define EXT3_IOC32_SETFLAGS FS_IOC32_SETFLAGS
252 #define EXT3_IOC32_GETVERSION _IOR('f', 3, int)
253 #define EXT3_IOC32_SETVERSION _IOW('f', 4, int)
254 #define EXT3_IOC32_GETRSVSZ _IOR('f', 5, int)
255 #define EXT3_IOC32_SETRSVSZ _IOW('f', 6, int)
256 #define EXT3_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
257 #ifdef CONFIG_JBD_DEBUG
258 #define EXT3_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
259 #endif
260 #define EXT3_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
261 #define EXT3_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
262
263
264 /*
265 * Mount options
266 */
267 struct ext3_mount_options {
268 unsigned long s_mount_opt;
269 uid_t s_resuid;
270 gid_t s_resgid;
271 unsigned long s_commit_interval;
272 #ifdef CONFIG_QUOTA
273 int s_jquota_fmt;
274 char *s_qf_names[MAXQUOTAS];
275 #endif
276 };
277
278 /*
279 * Structure of an inode on the disk
280 */
281 struct ext3_inode {
282 __le16 i_mode; /* File mode */
283 __le16 i_uid; /* Low 16 bits of Owner Uid */
284 __le32 i_size; /* Size in bytes */
285 __le32 i_atime; /* Access time */
286 __le32 i_ctime; /* Creation time */
287 __le32 i_mtime; /* Modification time */
288 __le32 i_dtime; /* Deletion Time */
289 __le16 i_gid; /* Low 16 bits of Group Id */
290 __le16 i_links_count; /* Links count */
291 __le32 i_blocks; /* Blocks count */
292 __le32 i_flags; /* File flags */
293 union {
294 struct {
295 __u32 l_i_reserved1;
296 } linux1;
297 struct {
298 __u32 h_i_translator;
299 } hurd1;
300 struct {
301 __u32 m_i_reserved1;
302 } masix1;
303 } osd1; /* OS dependent 1 */
304 __le32 i_block[EXT3_N_BLOCKS];/* Pointers to blocks */
305 __le32 i_generation; /* File version (for NFS) */
306 __le32 i_file_acl; /* File ACL */
307 __le32 i_dir_acl; /* Directory ACL */
308 __le32 i_faddr; /* Fragment address */
309 union {
310 struct {
311 __u8 l_i_frag; /* Fragment number */
312 __u8 l_i_fsize; /* Fragment size */
313 __u16 i_pad1;
314 __le16 l_i_uid_high; /* these 2 fields */
315 __le16 l_i_gid_high; /* were reserved2[0] */
316 __u32 l_i_reserved2;
317 } linux2;
318 struct {
319 __u8 h_i_frag; /* Fragment number */
320 __u8 h_i_fsize; /* Fragment size */
321 __u16 h_i_mode_high;
322 __u16 h_i_uid_high;
323 __u16 h_i_gid_high;
324 __u32 h_i_author;
325 } hurd2;
326 struct {
327 __u8 m_i_frag; /* Fragment number */
328 __u8 m_i_fsize; /* Fragment size */
329 __u16 m_pad1;
330 __u32 m_i_reserved2[2];
331 } masix2;
332 } osd2; /* OS dependent 2 */
333 __le16 i_extra_isize;
334 __le16 i_pad1;
335 };
336
337 #define i_size_high i_dir_acl
338
339 #if defined(__KERNEL__) || defined(__linux__)
340 #define i_reserved1 osd1.linux1.l_i_reserved1
341 #define i_frag osd2.linux2.l_i_frag
342 #define i_fsize osd2.linux2.l_i_fsize
343 #define i_uid_low i_uid
344 #define i_gid_low i_gid
345 #define i_uid_high osd2.linux2.l_i_uid_high
346 #define i_gid_high osd2.linux2.l_i_gid_high
347 #define i_reserved2 osd2.linux2.l_i_reserved2
348
349 #elif defined(__GNU__)
350
351 #define i_translator osd1.hurd1.h_i_translator
352 #define i_frag osd2.hurd2.h_i_frag;
353 #define i_fsize osd2.hurd2.h_i_fsize;
354 #define i_uid_high osd2.hurd2.h_i_uid_high
355 #define i_gid_high osd2.hurd2.h_i_gid_high
356 #define i_author osd2.hurd2.h_i_author
357
358 #elif defined(__masix__)
359
360 #define i_reserved1 osd1.masix1.m_i_reserved1
361 #define i_frag osd2.masix2.m_i_frag
362 #define i_fsize osd2.masix2.m_i_fsize
363 #define i_reserved2 osd2.masix2.m_i_reserved2
364
365 #endif /* defined(__KERNEL__) || defined(__linux__) */
366
367 /*
368 * File system states
369 */
370 #define EXT3_VALID_FS 0x0001 /* Unmounted cleanly */
371 #define EXT3_ERROR_FS 0x0002 /* Errors detected */
372 #define EXT3_ORPHAN_FS 0x0004 /* Orphans being recovered */
373
374 /*
375 * Misc. filesystem flags
376 */
377 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
378 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
379 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
380
381 /*
382 * Mount flags
383 */
384 #define EXT3_MOUNT_CHECK 0x00001 /* Do mount-time checks */
385 /* EXT3_MOUNT_OLDALLOC was there */
386 #define EXT3_MOUNT_GRPID 0x00004 /* Create files with directory's group */
387 #define EXT3_MOUNT_DEBUG 0x00008 /* Some debugging messages */
388 #define EXT3_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
389 #define EXT3_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
390 #define EXT3_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
391 #define EXT3_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
392 #define EXT3_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
393 #define EXT3_MOUNT_ABORT 0x00200 /* Fatal error detected */
394 #define EXT3_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
395 #define EXT3_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
396 #define EXT3_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
397 #define EXT3_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
398 #define EXT3_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
399 #define EXT3_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
400 #define EXT3_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
401 #define EXT3_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
402 #define EXT3_MOUNT_RESERVATION 0x10000 /* Preallocation */
403 #define EXT3_MOUNT_BARRIER 0x20000 /* Use block barriers */
404 #define EXT3_MOUNT_QUOTA 0x80000 /* Some quota option set */
405 #define EXT3_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
406 #define EXT3_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
407 #define EXT3_MOUNT_DATA_ERR_ABORT 0x400000 /* Abort on file data write
408 * error in ordered mode */
409
410 /* Compatibility, for having both ext2_fs.h and ext3_fs.h included at once */
411 #ifndef _LINUX_EXT2_FS_H
412 #define clear_opt(o, opt) o &= ~EXT3_MOUNT_##opt
413 #define set_opt(o, opt) o |= EXT3_MOUNT_##opt
414 #define test_opt(sb, opt) (EXT3_SB(sb)->s_mount_opt & \
415 EXT3_MOUNT_##opt)
416 #else
417 #define EXT2_MOUNT_NOLOAD EXT3_MOUNT_NOLOAD
418 #define EXT2_MOUNT_ABORT EXT3_MOUNT_ABORT
419 #define EXT2_MOUNT_DATA_FLAGS EXT3_MOUNT_DATA_FLAGS
420 #endif
421
422 #define ext3_set_bit __set_bit_le
423 #define ext3_set_bit_atomic ext2_set_bit_atomic
424 #define ext3_clear_bit __clear_bit_le
425 #define ext3_clear_bit_atomic ext2_clear_bit_atomic
426 #define ext3_test_bit test_bit_le
427 #define ext3_find_next_zero_bit find_next_zero_bit_le
428
429 /*
430 * Maximal mount counts between two filesystem checks
431 */
432 #define EXT3_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
433 #define EXT3_DFL_CHECKINTERVAL 0 /* Don't use interval check */
434
435 /*
436 * Behaviour when detecting errors
437 */
438 #define EXT3_ERRORS_CONTINUE 1 /* Continue execution */
439 #define EXT3_ERRORS_RO 2 /* Remount fs read-only */
440 #define EXT3_ERRORS_PANIC 3 /* Panic */
441 #define EXT3_ERRORS_DEFAULT EXT3_ERRORS_CONTINUE
442
443 /*
444 * Structure of the super block
445 */
446 struct ext3_super_block {
447 /*00*/ __le32 s_inodes_count; /* Inodes count */
448 __le32 s_blocks_count; /* Blocks count */
449 __le32 s_r_blocks_count; /* Reserved blocks count */
450 __le32 s_free_blocks_count; /* Free blocks count */
451 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
452 __le32 s_first_data_block; /* First Data Block */
453 __le32 s_log_block_size; /* Block size */
454 __le32 s_log_frag_size; /* Fragment size */
455 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
456 __le32 s_frags_per_group; /* # Fragments per group */
457 __le32 s_inodes_per_group; /* # Inodes per group */
458 __le32 s_mtime; /* Mount time */
459 /*30*/ __le32 s_wtime; /* Write time */
460 __le16 s_mnt_count; /* Mount count */
461 __le16 s_max_mnt_count; /* Maximal mount count */
462 __le16 s_magic; /* Magic signature */
463 __le16 s_state; /* File system state */
464 __le16 s_errors; /* Behaviour when detecting errors */
465 __le16 s_minor_rev_level; /* minor revision level */
466 /*40*/ __le32 s_lastcheck; /* time of last check */
467 __le32 s_checkinterval; /* max. time between checks */
468 __le32 s_creator_os; /* OS */
469 __le32 s_rev_level; /* Revision level */
470 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
471 __le16 s_def_resgid; /* Default gid for reserved blocks */
472 /*
473 * These fields are for EXT3_DYNAMIC_REV superblocks only.
474 *
475 * Note: the difference between the compatible feature set and
476 * the incompatible feature set is that if there is a bit set
477 * in the incompatible feature set that the kernel doesn't
478 * know about, it should refuse to mount the filesystem.
479 *
480 * e2fsck's requirements are more strict; if it doesn't know
481 * about a feature in either the compatible or incompatible
482 * feature set, it must abort and not try to meddle with
483 * things it doesn't understand...
484 */
485 __le32 s_first_ino; /* First non-reserved inode */
486 __le16 s_inode_size; /* size of inode structure */
487 __le16 s_block_group_nr; /* block group # of this superblock */
488 __le32 s_feature_compat; /* compatible feature set */
489 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
490 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
491 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
492 /*78*/ char s_volume_name[16]; /* volume name */
493 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
494 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
495 /*
496 * Performance hints. Directory preallocation should only
497 * happen if the EXT3_FEATURE_COMPAT_DIR_PREALLOC flag is on.
498 */
499 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
500 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
501 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
502 /*
503 * Journaling support valid if EXT3_FEATURE_COMPAT_HAS_JOURNAL set.
504 */
505 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
506 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
507 __le32 s_journal_dev; /* device number of journal file */
508 __le32 s_last_orphan; /* start of list of inodes to delete */
509 __le32 s_hash_seed[4]; /* HTREE hash seed */
510 __u8 s_def_hash_version; /* Default hash version to use */
511 __u8 s_reserved_char_pad;
512 __u16 s_reserved_word_pad;
513 __le32 s_default_mount_opts;
514 __le32 s_first_meta_bg; /* First metablock block group */
515 __le32 s_mkfs_time; /* When the filesystem was created */
516 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
517 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
518 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
519 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
520 __le32 s_free_blocks_count_hi; /* Free blocks count */
521 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
522 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
523 __le32 s_flags; /* Miscellaneous flags */
524 __le16 s_raid_stride; /* RAID stride */
525 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
526 __le64 s_mmp_block; /* Block for multi-mount protection */
527 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
528 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
529 __u8 s_reserved_char_pad2;
530 __le16 s_reserved_pad;
531 __u32 s_reserved[162]; /* Padding to the end of the block */
532 };
533
534 #ifdef __KERNEL__
535 #include <linux/ext3_fs_i.h>
536 #include <linux/ext3_fs_sb.h>
537 static inline struct ext3_sb_info * EXT3_SB(struct super_block *sb)
538 {
539 return sb->s_fs_info;
540 }
541 static inline struct ext3_inode_info *EXT3_I(struct inode *inode)
542 {
543 return container_of(inode, struct ext3_inode_info, vfs_inode);
544 }
545
546 static inline int ext3_valid_inum(struct super_block *sb, unsigned long ino)
547 {
548 return ino == EXT3_ROOT_INO ||
549 ino == EXT3_JOURNAL_INO ||
550 ino == EXT3_RESIZE_INO ||
551 (ino >= EXT3_FIRST_INO(sb) &&
552 ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
553 }
554
555 /*
556 * Inode dynamic state flags
557 */
558 enum {
559 EXT3_STATE_JDATA, /* journaled data exists */
560 EXT3_STATE_NEW, /* inode is newly created */
561 EXT3_STATE_XATTR, /* has in-inode xattrs */
562 EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */
563 };
564
565 static inline int ext3_test_inode_state(struct inode *inode, int bit)
566 {
567 return test_bit(bit, &EXT3_I(inode)->i_state_flags);
568 }
569
570 static inline void ext3_set_inode_state(struct inode *inode, int bit)
571 {
572 set_bit(bit, &EXT3_I(inode)->i_state_flags);
573 }
574
575 static inline void ext3_clear_inode_state(struct inode *inode, int bit)
576 {
577 clear_bit(bit, &EXT3_I(inode)->i_state_flags);
578 }
579 #else
580 /* Assume that user mode programs are passing in an ext3fs superblock, not
581 * a kernel struct super_block. This will allow us to call the feature-test
582 * macros from user land. */
583 #define EXT3_SB(sb) (sb)
584 #endif
585
586 #define NEXT_ORPHAN(inode) EXT3_I(inode)->i_dtime
587
588 /*
589 * Codes for operating systems
590 */
591 #define EXT3_OS_LINUX 0
592 #define EXT3_OS_HURD 1
593 #define EXT3_OS_MASIX 2
594 #define EXT3_OS_FREEBSD 3
595 #define EXT3_OS_LITES 4
596
597 /*
598 * Revision levels
599 */
600 #define EXT3_GOOD_OLD_REV 0 /* The good old (original) format */
601 #define EXT3_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
602
603 #define EXT3_CURRENT_REV EXT3_GOOD_OLD_REV
604 #define EXT3_MAX_SUPP_REV EXT3_DYNAMIC_REV
605
606 #define EXT3_GOOD_OLD_INODE_SIZE 128
607
608 /*
609 * Feature set definitions
610 */
611
612 #define EXT3_HAS_COMPAT_FEATURE(sb,mask) \
613 ( EXT3_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
614 #define EXT3_HAS_RO_COMPAT_FEATURE(sb,mask) \
615 ( EXT3_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
616 #define EXT3_HAS_INCOMPAT_FEATURE(sb,mask) \
617 ( EXT3_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
618 #define EXT3_SET_COMPAT_FEATURE(sb,mask) \
619 EXT3_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
620 #define EXT3_SET_RO_COMPAT_FEATURE(sb,mask) \
621 EXT3_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
622 #define EXT3_SET_INCOMPAT_FEATURE(sb,mask) \
623 EXT3_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
624 #define EXT3_CLEAR_COMPAT_FEATURE(sb,mask) \
625 EXT3_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
626 #define EXT3_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
627 EXT3_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
628 #define EXT3_CLEAR_INCOMPAT_FEATURE(sb,mask) \
629 EXT3_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
630
631 #define EXT3_FEATURE_COMPAT_DIR_PREALLOC 0x0001
632 #define EXT3_FEATURE_COMPAT_IMAGIC_INODES 0x0002
633 #define EXT3_FEATURE_COMPAT_HAS_JOURNAL 0x0004
634 #define EXT3_FEATURE_COMPAT_EXT_ATTR 0x0008
635 #define EXT3_FEATURE_COMPAT_RESIZE_INODE 0x0010
636 #define EXT3_FEATURE_COMPAT_DIR_INDEX 0x0020
637
638 #define EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
639 #define EXT3_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
640 #define EXT3_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
641
642 #define EXT3_FEATURE_INCOMPAT_COMPRESSION 0x0001
643 #define EXT3_FEATURE_INCOMPAT_FILETYPE 0x0002
644 #define EXT3_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
645 #define EXT3_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
646 #define EXT3_FEATURE_INCOMPAT_META_BG 0x0010
647
648 #define EXT3_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
649 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT3_FEATURE_INCOMPAT_FILETYPE| \
650 EXT3_FEATURE_INCOMPAT_RECOVER| \
651 EXT3_FEATURE_INCOMPAT_META_BG)
652 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT3_FEATURE_RO_COMPAT_SPARSE_SUPER| \
653 EXT3_FEATURE_RO_COMPAT_LARGE_FILE| \
654 EXT3_FEATURE_RO_COMPAT_BTREE_DIR)
655
656 /*
657 * Default values for user and/or group using reserved blocks
658 */
659 #define EXT3_DEF_RESUID 0
660 #define EXT3_DEF_RESGID 0
661
662 /*
663 * Default mount options
664 */
665 #define EXT3_DEFM_DEBUG 0x0001
666 #define EXT3_DEFM_BSDGROUPS 0x0002
667 #define EXT3_DEFM_XATTR_USER 0x0004
668 #define EXT3_DEFM_ACL 0x0008
669 #define EXT3_DEFM_UID16 0x0010
670 #define EXT3_DEFM_JMODE 0x0060
671 #define EXT3_DEFM_JMODE_DATA 0x0020
672 #define EXT3_DEFM_JMODE_ORDERED 0x0040
673 #define EXT3_DEFM_JMODE_WBACK 0x0060
674
675 /*
676 * Structure of a directory entry
677 */
678 #define EXT3_NAME_LEN 255
679
680 struct ext3_dir_entry {
681 __le32 inode; /* Inode number */
682 __le16 rec_len; /* Directory entry length */
683 __le16 name_len; /* Name length */
684 char name[EXT3_NAME_LEN]; /* File name */
685 };
686
687 /*
688 * The new version of the directory entry. Since EXT3 structures are
689 * stored in intel byte order, and the name_len field could never be
690 * bigger than 255 chars, it's safe to reclaim the extra byte for the
691 * file_type field.
692 */
693 struct ext3_dir_entry_2 {
694 __le32 inode; /* Inode number */
695 __le16 rec_len; /* Directory entry length */
696 __u8 name_len; /* Name length */
697 __u8 file_type;
698 char name[EXT3_NAME_LEN]; /* File name */
699 };
700
701 /*
702 * Ext3 directory file types. Only the low 3 bits are used. The
703 * other bits are reserved for now.
704 */
705 #define EXT3_FT_UNKNOWN 0
706 #define EXT3_FT_REG_FILE 1
707 #define EXT3_FT_DIR 2
708 #define EXT3_FT_CHRDEV 3
709 #define EXT3_FT_BLKDEV 4
710 #define EXT3_FT_FIFO 5
711 #define EXT3_FT_SOCK 6
712 #define EXT3_FT_SYMLINK 7
713
714 #define EXT3_FT_MAX 8
715
716 /*
717 * EXT3_DIR_PAD defines the directory entries boundaries
718 *
719 * NOTE: It must be a multiple of 4
720 */
721 #define EXT3_DIR_PAD 4
722 #define EXT3_DIR_ROUND (EXT3_DIR_PAD - 1)
723 #define EXT3_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT3_DIR_ROUND) & \
724 ~EXT3_DIR_ROUND)
725 #define EXT3_MAX_REC_LEN ((1<<16)-1)
726
727 /*
728 * Tests against MAX_REC_LEN etc were put in place for 64k block
729 * sizes; if that is not possible on this arch, we can skip
730 * those tests and speed things up.
731 */
732 static inline unsigned ext3_rec_len_from_disk(__le16 dlen)
733 {
734 unsigned len = le16_to_cpu(dlen);
735
736 #if (PAGE_CACHE_SIZE >= 65536)
737 if (len == EXT3_MAX_REC_LEN)
738 return 1 << 16;
739 #endif
740 return len;
741 }
742
743 static inline __le16 ext3_rec_len_to_disk(unsigned len)
744 {
745 #if (PAGE_CACHE_SIZE >= 65536)
746 if (len == (1 << 16))
747 return cpu_to_le16(EXT3_MAX_REC_LEN);
748 else if (len > (1 << 16))
749 BUG();
750 #endif
751 return cpu_to_le16(len);
752 }
753
754 /*
755 * Hash Tree Directory indexing
756 * (c) Daniel Phillips, 2001
757 */
758
759 #define is_dx(dir) (EXT3_HAS_COMPAT_FEATURE(dir->i_sb, \
760 EXT3_FEATURE_COMPAT_DIR_INDEX) && \
761 (EXT3_I(dir)->i_flags & EXT3_INDEX_FL))
762 #define EXT3_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT3_LINK_MAX)
763 #define EXT3_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
764
765 /* Legal values for the dx_root hash_version field: */
766
767 #define DX_HASH_LEGACY 0
768 #define DX_HASH_HALF_MD4 1
769 #define DX_HASH_TEA 2
770 #define DX_HASH_LEGACY_UNSIGNED 3
771 #define DX_HASH_HALF_MD4_UNSIGNED 4
772 #define DX_HASH_TEA_UNSIGNED 5
773
774 #ifdef __KERNEL__
775
776 /* hash info structure used by the directory hash */
777 struct dx_hash_info
778 {
779 u32 hash;
780 u32 minor_hash;
781 int hash_version;
782 u32 *seed;
783 };
784
785 #define EXT3_HTREE_EOF 0x7fffffff
786
787 /*
788 * Control parameters used by ext3_htree_next_block
789 */
790 #define HASH_NB_ALWAYS 1
791
792
793 /*
794 * Describe an inode's exact location on disk and in memory
795 */
796 struct ext3_iloc
797 {
798 struct buffer_head *bh;
799 unsigned long offset;
800 unsigned long block_group;
801 };
802
803 static inline struct ext3_inode *ext3_raw_inode(struct ext3_iloc *iloc)
804 {
805 return (struct ext3_inode *) (iloc->bh->b_data + iloc->offset);
806 }
807
808 /*
809 * This structure is stuffed into the struct file's private_data field
810 * for directories. It is where we put information so that we can do
811 * readdir operations in hash tree order.
812 */
813 struct dir_private_info {
814 struct rb_root root;
815 struct rb_node *curr_node;
816 struct fname *extra_fname;
817 loff_t last_pos;
818 __u32 curr_hash;
819 __u32 curr_minor_hash;
820 __u32 next_hash;
821 };
822
823 /* calculate the first block number of the group */
824 static inline ext3_fsblk_t
825 ext3_group_first_block_no(struct super_block *sb, unsigned long group_no)
826 {
827 return group_no * (ext3_fsblk_t)EXT3_BLOCKS_PER_GROUP(sb) +
828 le32_to_cpu(EXT3_SB(sb)->s_es->s_first_data_block);
829 }
830
831 /*
832 * Special error return code only used by dx_probe() and its callers.
833 */
834 #define ERR_BAD_DX_DIR -75000
835
836 /*
837 * Function prototypes
838 */
839
840 /*
841 * Ok, these declarations are also in <linux/kernel.h> but none of the
842 * ext3 source programs needs to include it so they are duplicated here.
843 */
844 # define NORET_TYPE /**/
845 # define ATTRIB_NORET __attribute__((noreturn))
846 # define NORET_AND noreturn,
847
848 /* balloc.c */
849 extern int ext3_bg_has_super(struct super_block *sb, int group);
850 extern unsigned long ext3_bg_num_gdb(struct super_block *sb, int group);
851 extern ext3_fsblk_t ext3_new_block (handle_t *handle, struct inode *inode,
852 ext3_fsblk_t goal, int *errp);
853 extern ext3_fsblk_t ext3_new_blocks (handle_t *handle, struct inode *inode,
854 ext3_fsblk_t goal, unsigned long *count, int *errp);
855 extern void ext3_free_blocks (handle_t *handle, struct inode *inode,
856 ext3_fsblk_t block, unsigned long count);
857 extern void ext3_free_blocks_sb (handle_t *handle, struct super_block *sb,
858 ext3_fsblk_t block, unsigned long count,
859 unsigned long *pdquot_freed_blocks);
860 extern ext3_fsblk_t ext3_count_free_blocks (struct super_block *);
861 extern void ext3_check_blocks_bitmap (struct super_block *);
862 extern struct ext3_group_desc * ext3_get_group_desc(struct super_block * sb,
863 unsigned int block_group,
864 struct buffer_head ** bh);
865 extern int ext3_should_retry_alloc(struct super_block *sb, int *retries);
866 extern void ext3_init_block_alloc_info(struct inode *);
867 extern void ext3_rsv_window_add(struct super_block *sb, struct ext3_reserve_window_node *rsv);
868 extern int ext3_trim_fs(struct super_block *sb, struct fstrim_range *range);
869
870 /* dir.c */
871 extern int ext3_check_dir_entry(const char *, struct inode *,
872 struct ext3_dir_entry_2 *,
873 struct buffer_head *, unsigned long);
874 extern int ext3_htree_store_dirent(struct file *dir_file, __u32 hash,
875 __u32 minor_hash,
876 struct ext3_dir_entry_2 *dirent);
877 extern void ext3_htree_free_dir_info(struct dir_private_info *p);
878
879 /* fsync.c */
880 extern int ext3_sync_file(struct file *, loff_t, loff_t, int);
881
882 /* hash.c */
883 extern int ext3fs_dirhash(const char *name, int len, struct
884 dx_hash_info *hinfo);
885
886 /* ialloc.c */
887 extern struct inode * ext3_new_inode (handle_t *, struct inode *,
888 const struct qstr *, int);
889 extern void ext3_free_inode (handle_t *, struct inode *);
890 extern struct inode * ext3_orphan_get (struct super_block *, unsigned long);
891 extern unsigned long ext3_count_free_inodes (struct super_block *);
892 extern unsigned long ext3_count_dirs (struct super_block *);
893 extern void ext3_check_inodes_bitmap (struct super_block *);
894 extern unsigned long ext3_count_free (struct buffer_head *, unsigned);
895
896
897 /* inode.c */
898 int ext3_forget(handle_t *handle, int is_metadata, struct inode *inode,
899 struct buffer_head *bh, ext3_fsblk_t blocknr);
900 struct buffer_head * ext3_getblk (handle_t *, struct inode *, long, int, int *);
901 struct buffer_head * ext3_bread (handle_t *, struct inode *, int, int, int *);
902 int ext3_get_blocks_handle(handle_t *handle, struct inode *inode,
903 sector_t iblock, unsigned long maxblocks, struct buffer_head *bh_result,
904 int create);
905
906 extern struct inode *ext3_iget(struct super_block *, unsigned long);
907 extern int ext3_write_inode (struct inode *, struct writeback_control *);
908 extern int ext3_setattr (struct dentry *, struct iattr *);
909 extern void ext3_evict_inode (struct inode *);
910 extern int ext3_sync_inode (handle_t *, struct inode *);
911 extern void ext3_discard_reservation (struct inode *);
912 extern void ext3_dirty_inode(struct inode *, int);
913 extern int ext3_change_inode_journal_flag(struct inode *, int);
914 extern int ext3_get_inode_loc(struct inode *, struct ext3_iloc *);
915 extern int ext3_can_truncate(struct inode *inode);
916 extern void ext3_truncate(struct inode *inode);
917 extern void ext3_set_inode_flags(struct inode *);
918 extern void ext3_get_inode_flags(struct ext3_inode_info *);
919 extern void ext3_set_aops(struct inode *inode);
920 extern int ext3_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
921 u64 start, u64 len);
922
923 /* ioctl.c */
924 extern long ext3_ioctl(struct file *, unsigned int, unsigned long);
925 extern long ext3_compat_ioctl(struct file *, unsigned int, unsigned long);
926
927 /* namei.c */
928 extern int ext3_orphan_add(handle_t *, struct inode *);
929 extern int ext3_orphan_del(handle_t *, struct inode *);
930 extern int ext3_htree_fill_tree(struct file *dir_file, __u32 start_hash,
931 __u32 start_minor_hash, __u32 *next_hash);
932
933 /* resize.c */
934 extern int ext3_group_add(struct super_block *sb,
935 struct ext3_new_group_data *input);
936 extern int ext3_group_extend(struct super_block *sb,
937 struct ext3_super_block *es,
938 ext3_fsblk_t n_blocks_count);
939
940 /* super.c */
941 extern __printf(3, 4)
942 void ext3_error(struct super_block *, const char *, const char *, ...);
943 extern void __ext3_std_error (struct super_block *, const char *, int);
944 extern __printf(3, 4)
945 void ext3_abort(struct super_block *, const char *, const char *, ...);
946 extern __printf(3, 4)
947 void ext3_warning(struct super_block *, const char *, const char *, ...);
948 extern __printf(3, 4)
949 void ext3_msg(struct super_block *, const char *, const char *, ...);
950 extern void ext3_update_dynamic_rev (struct super_block *sb);
951
952 #define ext3_std_error(sb, errno) \
953 do { \
954 if ((errno)) \
955 __ext3_std_error((sb), __func__, (errno)); \
956 } while (0)
957
958 /*
959 * Inodes and files operations
960 */
961
962 /* dir.c */
963 extern const struct file_operations ext3_dir_operations;
964
965 /* file.c */
966 extern const struct inode_operations ext3_file_inode_operations;
967 extern const struct file_operations ext3_file_operations;
968
969 /* namei.c */
970 extern const struct inode_operations ext3_dir_inode_operations;
971 extern const struct inode_operations ext3_special_inode_operations;
972
973 /* symlink.c */
974 extern const struct inode_operations ext3_symlink_inode_operations;
975 extern const struct inode_operations ext3_fast_symlink_inode_operations;
976
977
978 #endif /* __KERNEL__ */
979
980 #endif /* _LINUX_EXT3_FS_H */