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ext4: Fix race between migration and mmap write
[linux-2.6/mini2440.git] / include / linux / ext4_fs.h
blob105337ca9ed048d8787868840b19cef0373af0d5
1 /*
2 * linux/include/linux/ext4_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_EXT4_FS_H
17 #define _LINUX_EXT4_FS_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22
23 #include <linux/ext4_fs_i.h>
24
25 /*
26 * The second extended filesystem constants/structures
27 */
28
29 /*
30 * Define EXT4FS_DEBUG to produce debug messages
31 */
32 #undef EXT4FS_DEBUG
33
34 /*
35 * Define EXT4_RESERVATION to reserve data blocks for expanding files
36 */
37 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
38 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
39 #define EXT4_MAX_RESERVE_BLOCKS 1027
40 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
41
42 /*
43 * Debug code
44 */
45 #ifdef EXT4FS_DEBUG
46 #define ext4_debug(f, a...) \
47 do { \
48 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __FUNCTION__); \
50 printk (KERN_DEBUG f, ## a); \
51 } while (0)
52 #else
53 #define ext4_debug(f, a...) do {} while (0)
54 #endif
55
56 #define EXT4_MULTIBLOCK_ALLOCATOR 1
57
58 /* prefer goal again. length */
59 #define EXT4_MB_HINT_MERGE 1
60 /* blocks already reserved */
61 #define EXT4_MB_HINT_RESERVED 2
62 /* metadata is being allocated */
63 #define EXT4_MB_HINT_METADATA 4
64 /* first blocks in the file */
65 #define EXT4_MB_HINT_FIRST 8
66 /* search for the best chunk */
67 #define EXT4_MB_HINT_BEST 16
68 /* data is being allocated */
69 #define EXT4_MB_HINT_DATA 32
70 /* don't preallocate (for tails) */
71 #define EXT4_MB_HINT_NOPREALLOC 64
72 /* allocate for locality group */
73 #define EXT4_MB_HINT_GROUP_ALLOC 128
74 /* allocate goal blocks or none */
75 #define EXT4_MB_HINT_GOAL_ONLY 256
76 /* goal is meaningful */
77 #define EXT4_MB_HINT_TRY_GOAL 512
78
79 struct ext4_allocation_request {
80 /* target inode for block we're allocating */
81 struct inode *inode;
82 /* logical block in target inode */
83 ext4_lblk_t logical;
84 /* phys. target (a hint) */
85 ext4_fsblk_t goal;
86 /* the closest logical allocated block to the left */
87 ext4_lblk_t lleft;
88 /* phys. block for ^^^ */
89 ext4_fsblk_t pleft;
90 /* the closest logical allocated block to the right */
91 ext4_lblk_t lright;
92 /* phys. block for ^^^ */
93 ext4_fsblk_t pright;
94 /* how many blocks we want to allocate */
95 unsigned long len;
96 /* flags. see above EXT4_MB_HINT_* */
97 unsigned long flags;
98 };
99
100 /*
101 * Special inodes numbers
102 */
103 #define EXT4_BAD_INO 1 /* Bad blocks inode */
104 #define EXT4_ROOT_INO 2 /* Root inode */
105 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
106 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
107 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
108 #define EXT4_JOURNAL_INO 8 /* Journal inode */
109
110 /* First non-reserved inode for old ext4 filesystems */
111 #define EXT4_GOOD_OLD_FIRST_INO 11
112
113 /*
114 * Maximal count of links to a file
115 */
116 #define EXT4_LINK_MAX 65000
117
118 /*
119 * Macro-instructions used to manage several block sizes
120 */
121 #define EXT4_MIN_BLOCK_SIZE 1024
122 #define EXT4_MAX_BLOCK_SIZE 65536
123 #define EXT4_MIN_BLOCK_LOG_SIZE 10
124 #ifdef __KERNEL__
125 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
126 #else
127 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
128 #endif
129 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
130 #ifdef __KERNEL__
131 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
132 #else
133 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
134 #endif
135 #ifdef __KERNEL__
136 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
137 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
138 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
139 #else
140 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
141 EXT4_GOOD_OLD_INODE_SIZE : \
142 (s)->s_inode_size)
143 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
144 EXT4_GOOD_OLD_FIRST_INO : \
145 (s)->s_first_ino)
146 #endif
147 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
148
149 /*
150 * Structure of a blocks group descriptor
151 */
152 struct ext4_group_desc
153 {
154 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
155 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
156 __le32 bg_inode_table_lo; /* Inodes table block */
157 __le16 bg_free_blocks_count; /* Free blocks count */
158 __le16 bg_free_inodes_count; /* Free inodes count */
159 __le16 bg_used_dirs_count; /* Directories count */
160 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
161 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
162 __le16 bg_itable_unused; /* Unused inodes count */
163 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
164 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
165 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
166 __le32 bg_inode_table_hi; /* Inodes table block MSB */
167 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
168 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
169 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
170 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
171 __u32 bg_reserved2[3];
172 };
173
174 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
175 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
176 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
177
178 #ifdef __KERNEL__
179 #include <linux/ext4_fs_i.h>
180 #include <linux/ext4_fs_sb.h>
181 #endif
182 /*
183 * Macro-instructions used to manage group descriptors
184 */
185 #define EXT4_MIN_DESC_SIZE 32
186 #define EXT4_MIN_DESC_SIZE_64BIT 64
187 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
188 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
189 #ifdef __KERNEL__
190 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
191 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
192 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
193 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
194 #else
195 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
196 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
197 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
198 #endif
199
200 /*
201 * Constants relative to the data blocks
202 */
203 #define EXT4_NDIR_BLOCKS 12
204 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
205 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
206 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
207 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
208
209 /*
210 * Inode flags
211 */
212 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
213 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
214 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
215 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
216 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
217 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
218 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
219 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
220 /* Reserved for compression usage... */
221 #define EXT4_DIRTY_FL 0x00000100
222 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
223 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
224 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
225 /* End compression flags --- maybe not all used */
226 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
227 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
228 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
229 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
230 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
231 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
232 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
233 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
234 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
235 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
236
237 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
238 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
239
240 /*
241 * Inode dynamic state flags
242 */
243 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
244 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
245 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
246 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
247
248 /* Used to pass group descriptor data when online resize is done */
249 struct ext4_new_group_input {
250 __u32 group; /* Group number for this data */
251 __u64 block_bitmap; /* Absolute block number of block bitmap */
252 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
253 __u64 inode_table; /* Absolute block number of inode table start */
254 __u32 blocks_count; /* Total number of blocks in this group */
255 __u16 reserved_blocks; /* Number of reserved blocks in this group */
256 __u16 unused;
257 };
258
259 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
260 struct ext4_new_group_data {
261 __u32 group;
262 __u64 block_bitmap;
263 __u64 inode_bitmap;
264 __u64 inode_table;
265 __u32 blocks_count;
266 __u16 reserved_blocks;
267 __u16 unused;
268 __u32 free_blocks_count;
269 };
270
271 /*
272 * Following is used by preallocation code to tell get_blocks() that we
273 * want uninitialzed extents.
274 */
275 #define EXT4_CREATE_UNINITIALIZED_EXT 2
276
277 /*
278 * ioctl commands
279 */
280 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
281 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
282 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
283 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
284 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
285 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
286 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
287 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
288 #ifdef CONFIG_JBD2_DEBUG
289 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
290 #endif
291 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
292 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
293 #define EXT4_IOC_MIGRATE _IO('f', 7)
294
295 /*
296 * ioctl commands in 32 bit emulation
297 */
298 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
299 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
300 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
301 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
302 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
303 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
304 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
305 #ifdef CONFIG_JBD2_DEBUG
306 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
307 #endif
308 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
309 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
310
311
312 /*
313 * Mount options
314 */
315 struct ext4_mount_options {
316 unsigned long s_mount_opt;
317 uid_t s_resuid;
318 gid_t s_resgid;
319 unsigned long s_commit_interval;
320 #ifdef CONFIG_QUOTA
321 int s_jquota_fmt;
322 char *s_qf_names[MAXQUOTAS];
323 #endif
324 };
325
326 /*
327 * Structure of an inode on the disk
328 */
329 struct ext4_inode {
330 __le16 i_mode; /* File mode */
331 __le16 i_uid; /* Low 16 bits of Owner Uid */
332 __le32 i_size_lo; /* Size in bytes */
333 __le32 i_atime; /* Access time */
334 __le32 i_ctime; /* Inode Change time */
335 __le32 i_mtime; /* Modification time */
336 __le32 i_dtime; /* Deletion Time */
337 __le16 i_gid; /* Low 16 bits of Group Id */
338 __le16 i_links_count; /* Links count */
339 __le32 i_blocks_lo; /* Blocks count */
340 __le32 i_flags; /* File flags */
341 union {
342 struct {
343 __le32 l_i_version;
344 } linux1;
345 struct {
346 __u32 h_i_translator;
347 } hurd1;
348 struct {
349 __u32 m_i_reserved1;
350 } masix1;
351 } osd1; /* OS dependent 1 */
352 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
353 __le32 i_generation; /* File version (for NFS) */
354 __le32 i_file_acl_lo; /* File ACL */
355 __le32 i_size_high;
356 __le32 i_obso_faddr; /* Obsoleted fragment address */
357 union {
358 struct {
359 __le16 l_i_blocks_high; /* were l_i_reserved1 */
360 __le16 l_i_file_acl_high;
361 __le16 l_i_uid_high; /* these 2 fields */
362 __le16 l_i_gid_high; /* were reserved2[0] */
363 __u32 l_i_reserved2;
364 } linux2;
365 struct {
366 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
367 __u16 h_i_mode_high;
368 __u16 h_i_uid_high;
369 __u16 h_i_gid_high;
370 __u32 h_i_author;
371 } hurd2;
372 struct {
373 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
374 __le16 m_i_file_acl_high;
375 __u32 m_i_reserved2[2];
376 } masix2;
377 } osd2; /* OS dependent 2 */
378 __le16 i_extra_isize;
379 __le16 i_pad1;
380 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
381 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
382 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
383 __le32 i_crtime; /* File Creation time */
384 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
385 __le32 i_version_hi; /* high 32 bits for 64-bit version */
386 };
387
388
389 #define EXT4_EPOCH_BITS 2
390 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
391 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
392
393 /*
394 * Extended fields will fit into an inode if the filesystem was formatted
395 * with large inodes (-I 256 or larger) and there are not currently any EAs
396 * consuming all of the available space. For new inodes we always reserve
397 * enough space for the kernel's known extended fields, but for inodes
398 * created with an old kernel this might not have been the case. None of
399 * the extended inode fields is critical for correct filesystem operation.
400 * This macro checks if a certain field fits in the inode. Note that
401 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
402 */
403 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
404 ((offsetof(typeof(*ext4_inode), field) + \
405 sizeof((ext4_inode)->field)) \
406 <= (EXT4_GOOD_OLD_INODE_SIZE + \
407 (einode)->i_extra_isize)) \
408
409 static inline __le32 ext4_encode_extra_time(struct timespec *time)
410 {
411 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
412 time->tv_sec >> 32 : 0) |
413 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
414 }
415
416 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
417 {
418 if (sizeof(time->tv_sec) > 4)
419 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
420 << 32;
421 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
422 }
423
424 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
425 do { \
426 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
427 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
428 (raw_inode)->xtime ## _extra = \
429 ext4_encode_extra_time(&(inode)->xtime); \
430 } while (0)
431
432 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
433 do { \
434 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
435 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
436 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
437 (raw_inode)->xtime ## _extra = \
438 ext4_encode_extra_time(&(einode)->xtime); \
439 } while (0)
440
441 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
442 do { \
443 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
444 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
445 ext4_decode_extra_time(&(inode)->xtime, \
446 raw_inode->xtime ## _extra); \
447 } while (0)
448
449 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
450 do { \
451 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
452 (einode)->xtime.tv_sec = \
453 (signed)le32_to_cpu((raw_inode)->xtime); \
454 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
455 ext4_decode_extra_time(&(einode)->xtime, \
456 raw_inode->xtime ## _extra); \
457 } while (0)
458
459 #define i_disk_version osd1.linux1.l_i_version
460
461 #if defined(__KERNEL__) || defined(__linux__)
462 #define i_reserved1 osd1.linux1.l_i_reserved1
463 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
464 #define i_blocks_high osd2.linux2.l_i_blocks_high
465 #define i_uid_low i_uid
466 #define i_gid_low i_gid
467 #define i_uid_high osd2.linux2.l_i_uid_high
468 #define i_gid_high osd2.linux2.l_i_gid_high
469 #define i_reserved2 osd2.linux2.l_i_reserved2
470
471 #elif defined(__GNU__)
472
473 #define i_translator osd1.hurd1.h_i_translator
474 #define i_uid_high osd2.hurd2.h_i_uid_high
475 #define i_gid_high osd2.hurd2.h_i_gid_high
476 #define i_author osd2.hurd2.h_i_author
477
478 #elif defined(__masix__)
479
480 #define i_reserved1 osd1.masix1.m_i_reserved1
481 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
482 #define i_reserved2 osd2.masix2.m_i_reserved2
483
484 #endif /* defined(__KERNEL__) || defined(__linux__) */
485
486 /*
487 * File system states
488 */
489 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
490 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
491 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
492
493 /*
494 * Misc. filesystem flags
495 */
496 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
497 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
498 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
499
500 /*
501 * Mount flags
502 */
503 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
504 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
505 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
506 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
507 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
508 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
509 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
510 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
511 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
512 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
513 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
514 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
515 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
516 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
517 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
518 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
519 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
520 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
521 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
522 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
523 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
524 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
525 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
526 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
527 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
528 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
529 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
530 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
531 #define EXT4_MOUNT_MBALLOC 0x4000000 /* Buddy allocation support */
532 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
533 #ifndef _LINUX_EXT2_FS_H
534 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
535 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
536 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
537 EXT4_MOUNT_##opt)
538 #else
539 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
540 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
541 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
542 #endif
543
544 #define ext4_set_bit ext2_set_bit
545 #define ext4_set_bit_atomic ext2_set_bit_atomic
546 #define ext4_clear_bit ext2_clear_bit
547 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
548 #define ext4_test_bit ext2_test_bit
549 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
550 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
551 #define ext4_find_next_bit ext2_find_next_bit
552
553 /*
554 * Maximal mount counts between two filesystem checks
555 */
556 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
557 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
558
559 /*
560 * Behaviour when detecting errors
561 */
562 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
563 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
564 #define EXT4_ERRORS_PANIC 3 /* Panic */
565 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
566
567 /*
568 * Structure of the super block
569 */
570 struct ext4_super_block {
571 /*00*/ __le32 s_inodes_count; /* Inodes count */
572 __le32 s_blocks_count_lo; /* Blocks count */
573 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
574 __le32 s_free_blocks_count_lo; /* Free blocks count */
575 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
576 __le32 s_first_data_block; /* First Data Block */
577 __le32 s_log_block_size; /* Block size */
578 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
579 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
580 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
581 __le32 s_inodes_per_group; /* # Inodes per group */
582 __le32 s_mtime; /* Mount time */
583 /*30*/ __le32 s_wtime; /* Write time */
584 __le16 s_mnt_count; /* Mount count */
585 __le16 s_max_mnt_count; /* Maximal mount count */
586 __le16 s_magic; /* Magic signature */
587 __le16 s_state; /* File system state */
588 __le16 s_errors; /* Behaviour when detecting errors */
589 __le16 s_minor_rev_level; /* minor revision level */
590 /*40*/ __le32 s_lastcheck; /* time of last check */
591 __le32 s_checkinterval; /* max. time between checks */
592 __le32 s_creator_os; /* OS */
593 __le32 s_rev_level; /* Revision level */
594 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
595 __le16 s_def_resgid; /* Default gid for reserved blocks */
596 /*
597 * These fields are for EXT4_DYNAMIC_REV superblocks only.
598 *
599 * Note: the difference between the compatible feature set and
600 * the incompatible feature set is that if there is a bit set
601 * in the incompatible feature set that the kernel doesn't
602 * know about, it should refuse to mount the filesystem.
603 *
604 * e2fsck's requirements are more strict; if it doesn't know
605 * about a feature in either the compatible or incompatible
606 * feature set, it must abort and not try to meddle with
607 * things it doesn't understand...
608 */
609 __le32 s_first_ino; /* First non-reserved inode */
610 __le16 s_inode_size; /* size of inode structure */
611 __le16 s_block_group_nr; /* block group # of this superblock */
612 __le32 s_feature_compat; /* compatible feature set */
613 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
614 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
615 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
616 /*78*/ char s_volume_name[16]; /* volume name */
617 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
618 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
619 /*
620 * Performance hints. Directory preallocation should only
621 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
622 */
623 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
624 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
625 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
626 /*
627 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
628 */
629 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
630 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
631 __le32 s_journal_dev; /* device number of journal file */
632 __le32 s_last_orphan; /* start of list of inodes to delete */
633 __le32 s_hash_seed[4]; /* HTREE hash seed */
634 __u8 s_def_hash_version; /* Default hash version to use */
635 __u8 s_reserved_char_pad;
636 __le16 s_desc_size; /* size of group descriptor */
637 /*100*/ __le32 s_default_mount_opts;
638 __le32 s_first_meta_bg; /* First metablock block group */
639 __le32 s_mkfs_time; /* When the filesystem was created */
640 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
641 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
642 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
643 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
644 __le32 s_free_blocks_count_hi; /* Free blocks count */
645 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
646 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
647 __le32 s_flags; /* Miscellaneous flags */
648 __le16 s_raid_stride; /* RAID stride */
649 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
650 __le64 s_mmp_block; /* Block for multi-mount protection */
651 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
652 __u32 s_reserved[163]; /* Padding to the end of the block */
653 };
654
655 #ifdef __KERNEL__
656 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
657 {
658 return sb->s_fs_info;
659 }
660 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
661 {
662 return container_of(inode, struct ext4_inode_info, vfs_inode);
663 }
664
665 static inline struct timespec ext4_current_time(struct inode *inode)
666 {
667 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
668 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
669 }
670
671
672 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
673 {
674 return ino == EXT4_ROOT_INO ||
675 ino == EXT4_JOURNAL_INO ||
676 ino == EXT4_RESIZE_INO ||
677 (ino >= EXT4_FIRST_INO(sb) &&
678 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
679 }
680 #else
681 /* Assume that user mode programs are passing in an ext4fs superblock, not
682 * a kernel struct super_block. This will allow us to call the feature-test
683 * macros from user land. */
684 #define EXT4_SB(sb) (sb)
685 #endif
686
687 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
688
689 /*
690 * Codes for operating systems
691 */
692 #define EXT4_OS_LINUX 0
693 #define EXT4_OS_HURD 1
694 #define EXT4_OS_MASIX 2
695 #define EXT4_OS_FREEBSD 3
696 #define EXT4_OS_LITES 4
697
698 /*
699 * Revision levels
700 */
701 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
702 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
703
704 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
705 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
706
707 #define EXT4_GOOD_OLD_INODE_SIZE 128
708
709 /*
710 * Feature set definitions
711 */
712
713 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
714 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
715 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
716 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
717 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
718 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
719 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
720 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
721 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
722 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
723 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
724 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
725 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
726 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
727 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
728 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
729 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
730 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
731
732 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
733 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
734 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
735 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
736 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
737 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
738
739 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
740 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
741 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
742 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
743 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
744 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
745 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
746
747 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
748 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
749 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
750 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
751 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
752 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
753 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
754 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
755 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
756
757 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
758 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
759 EXT4_FEATURE_INCOMPAT_RECOVER| \
760 EXT4_FEATURE_INCOMPAT_META_BG| \
761 EXT4_FEATURE_INCOMPAT_EXTENTS| \
762 EXT4_FEATURE_INCOMPAT_64BIT| \
763 EXT4_FEATURE_INCOMPAT_FLEX_BG)
764 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
765 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
766 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
767 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
768 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
769 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
770 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
771
772 /*
773 * Default values for user and/or group using reserved blocks
774 */
775 #define EXT4_DEF_RESUID 0
776 #define EXT4_DEF_RESGID 0
777
778 /*
779 * Default mount options
780 */
781 #define EXT4_DEFM_DEBUG 0x0001
782 #define EXT4_DEFM_BSDGROUPS 0x0002
783 #define EXT4_DEFM_XATTR_USER 0x0004
784 #define EXT4_DEFM_ACL 0x0008
785 #define EXT4_DEFM_UID16 0x0010
786 #define EXT4_DEFM_JMODE 0x0060
787 #define EXT4_DEFM_JMODE_DATA 0x0020
788 #define EXT4_DEFM_JMODE_ORDERED 0x0040
789 #define EXT4_DEFM_JMODE_WBACK 0x0060
790
791 /*
792 * Structure of a directory entry
793 */
794 #define EXT4_NAME_LEN 255
795
796 struct ext4_dir_entry {
797 __le32 inode; /* Inode number */
798 __le16 rec_len; /* Directory entry length */
799 __le16 name_len; /* Name length */
800 char name[EXT4_NAME_LEN]; /* File name */
801 };
802
803 /*
804 * The new version of the directory entry. Since EXT4 structures are
805 * stored in intel byte order, and the name_len field could never be
806 * bigger than 255 chars, it's safe to reclaim the extra byte for the
807 * file_type field.
808 */
809 struct ext4_dir_entry_2 {
810 __le32 inode; /* Inode number */
811 __le16 rec_len; /* Directory entry length */
812 __u8 name_len; /* Name length */
813 __u8 file_type;
814 char name[EXT4_NAME_LEN]; /* File name */
815 };
816
817 /*
818 * Ext4 directory file types. Only the low 3 bits are used. The
819 * other bits are reserved for now.
820 */
821 #define EXT4_FT_UNKNOWN 0
822 #define EXT4_FT_REG_FILE 1
823 #define EXT4_FT_DIR 2
824 #define EXT4_FT_CHRDEV 3
825 #define EXT4_FT_BLKDEV 4
826 #define EXT4_FT_FIFO 5
827 #define EXT4_FT_SOCK 6
828 #define EXT4_FT_SYMLINK 7
829
830 #define EXT4_FT_MAX 8
831
832 /*
833 * EXT4_DIR_PAD defines the directory entries boundaries
834 *
835 * NOTE: It must be a multiple of 4
836 */
837 #define EXT4_DIR_PAD 4
838 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
839 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
840 ~EXT4_DIR_ROUND)
841 #define EXT4_MAX_REC_LEN ((1<<16)-1)
842
843 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
844 {
845 unsigned len = le16_to_cpu(dlen);
846
847 if (len == EXT4_MAX_REC_LEN)
848 return 1 << 16;
849 return len;
850 }
851
852 static inline __le16 ext4_rec_len_to_disk(unsigned len)
853 {
854 if (len == (1 << 16))
855 return cpu_to_le16(EXT4_MAX_REC_LEN);
856 else if (len > (1 << 16))
857 BUG();
858 return cpu_to_le16(len);
859 }
860
861 /*
862 * Hash Tree Directory indexing
863 * (c) Daniel Phillips, 2001
864 */
865
866 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
867 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
868 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
869 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
870 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
871
872 /* Legal values for the dx_root hash_version field: */
873
874 #define DX_HASH_LEGACY 0
875 #define DX_HASH_HALF_MD4 1
876 #define DX_HASH_TEA 2
877
878 #ifdef __KERNEL__
879
880 /* hash info structure used by the directory hash */
881 struct dx_hash_info
882 {
883 u32 hash;
884 u32 minor_hash;
885 int hash_version;
886 u32 *seed;
887 };
888
889 #define EXT4_HTREE_EOF 0x7fffffff
890
891 /*
892 * Control parameters used by ext4_htree_next_block
893 */
894 #define HASH_NB_ALWAYS 1
895
896
897 /*
898 * Describe an inode's exact location on disk and in memory
899 */
900 struct ext4_iloc
901 {
902 struct buffer_head *bh;
903 unsigned long offset;
904 ext4_group_t block_group;
905 };
906
907 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
908 {
909 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
910 }
911
912 /*
913 * This structure is stuffed into the struct file's private_data field
914 * for directories. It is where we put information so that we can do
915 * readdir operations in hash tree order.
916 */
917 struct dir_private_info {
918 struct rb_root root;
919 struct rb_node *curr_node;
920 struct fname *extra_fname;
921 loff_t last_pos;
922 __u32 curr_hash;
923 __u32 curr_minor_hash;
924 __u32 next_hash;
925 };
926
927 /* calculate the first block number of the group */
928 static inline ext4_fsblk_t
929 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
930 {
931 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
932 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
933 }
934
935 /*
936 * Special error return code only used by dx_probe() and its callers.
937 */
938 #define ERR_BAD_DX_DIR -75000
939
940 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
941 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
942
943 /*
944 * Function prototypes
945 */
946
947 /*
948 * Ok, these declarations are also in <linux/kernel.h> but none of the
949 * ext4 source programs needs to include it so they are duplicated here.
950 */
951 # define NORET_TYPE /**/
952 # define ATTRIB_NORET __attribute__((noreturn))
953 # define NORET_AND noreturn,
954
955 /* balloc.c */
956 extern unsigned int ext4_block_group(struct super_block *sb,
957 ext4_fsblk_t blocknr);
958 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
959 ext4_fsblk_t blocknr);
960 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
961 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
962 ext4_group_t group);
963 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
964 ext4_fsblk_t goal, int *errp);
965 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
966 ext4_fsblk_t goal, unsigned long *count, int *errp);
967 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
968 ext4_fsblk_t goal, unsigned long *count, int *errp);
969 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
970 ext4_fsblk_t block, unsigned long count, int metadata);
971 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
972 ext4_fsblk_t block, unsigned long count,
973 unsigned long *pdquot_freed_blocks);
974 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
975 extern void ext4_check_blocks_bitmap (struct super_block *);
976 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
977 ext4_group_t block_group,
978 struct buffer_head ** bh);
979 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
980 extern void ext4_init_block_alloc_info(struct inode *);
981 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
982
983 /* dir.c */
984 extern int ext4_check_dir_entry(const char *, struct inode *,
985 struct ext4_dir_entry_2 *,
986 struct buffer_head *, unsigned long);
987 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
988 __u32 minor_hash,
989 struct ext4_dir_entry_2 *dirent);
990 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
991
992 /* fsync.c */
993 extern int ext4_sync_file (struct file *, struct dentry *, int);
994
995 /* hash.c */
996 extern int ext4fs_dirhash(const char *name, int len, struct
997 dx_hash_info *hinfo);
998
999 /* ialloc.c */
1000 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
1001 extern void ext4_free_inode (handle_t *, struct inode *);
1002 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
1003 extern unsigned long ext4_count_free_inodes (struct super_block *);
1004 extern unsigned long ext4_count_dirs (struct super_block *);
1005 extern void ext4_check_inodes_bitmap (struct super_block *);
1006 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
1007
1008 /* mballoc.c */
1009 extern long ext4_mb_stats;
1010 extern long ext4_mb_max_to_scan;
1011 extern int ext4_mb_init(struct super_block *, int);
1012 extern int ext4_mb_release(struct super_block *);
1013 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1014 struct ext4_allocation_request *, int *);
1015 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1016 extern void ext4_mb_discard_inode_preallocations(struct inode *);
1017 extern int __init init_ext4_mballoc(void);
1018 extern void exit_ext4_mballoc(void);
1019 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1020 unsigned long, unsigned long, int, unsigned long *);
1021
1022
1023 /* inode.c */
1024 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1025 struct buffer_head *bh, ext4_fsblk_t blocknr);
1026 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1027 ext4_lblk_t, int, int *);
1028 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1029 ext4_lblk_t, int, int *);
1030 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
1031 ext4_lblk_t iblock, unsigned long maxblocks,
1032 struct buffer_head *bh_result,
1033 int create, int extend_disksize);
1034
1035 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1036 extern int ext4_write_inode (struct inode *, int);
1037 extern int ext4_setattr (struct dentry *, struct iattr *);
1038 extern void ext4_delete_inode (struct inode *);
1039 extern int ext4_sync_inode (handle_t *, struct inode *);
1040 extern void ext4_discard_reservation (struct inode *);
1041 extern void ext4_dirty_inode(struct inode *);
1042 extern int ext4_change_inode_journal_flag(struct inode *, int);
1043 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1044 extern void ext4_truncate (struct inode *);
1045 extern void ext4_set_inode_flags(struct inode *);
1046 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1047 extern void ext4_set_aops(struct inode *inode);
1048 extern int ext4_writepage_trans_blocks(struct inode *);
1049 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
1050 struct address_space *mapping, loff_t from);
1051
1052 /* ioctl.c */
1053 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
1054 unsigned long);
1055 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
1056
1057 /* migrate.c */
1058 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
1059 unsigned long);
1060 /* namei.c */
1061 extern int ext4_orphan_add(handle_t *, struct inode *);
1062 extern int ext4_orphan_del(handle_t *, struct inode *);
1063 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1064 __u32 start_minor_hash, __u32 *next_hash);
1065
1066 /* resize.c */
1067 extern int ext4_group_add(struct super_block *sb,
1068 struct ext4_new_group_data *input);
1069 extern int ext4_group_extend(struct super_block *sb,
1070 struct ext4_super_block *es,
1071 ext4_fsblk_t n_blocks_count);
1072
1073 /* super.c */
1074 extern void ext4_error (struct super_block *, const char *, const char *, ...)
1075 __attribute__ ((format (printf, 3, 4)));
1076 extern void __ext4_std_error (struct super_block *, const char *, int);
1077 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1078 __attribute__ ((format (printf, 3, 4)));
1079 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1080 __attribute__ ((format (printf, 3, 4)));
1081 extern void ext4_update_dynamic_rev (struct super_block *sb);
1082 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1083 __u32 compat);
1084 extern int ext4_update_rocompat_feature(handle_t *handle,
1085 struct super_block *sb, __u32 rocompat);
1086 extern int ext4_update_incompat_feature(handle_t *handle,
1087 struct super_block *sb, __u32 incompat);
1088 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1089 struct ext4_group_desc *bg);
1090 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1091 struct ext4_group_desc *bg);
1092 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1093 struct ext4_group_desc *bg);
1094 extern void ext4_block_bitmap_set(struct super_block *sb,
1095 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1096 extern void ext4_inode_bitmap_set(struct super_block *sb,
1097 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1098 extern void ext4_inode_table_set(struct super_block *sb,
1099 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1100
1101 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1102 {
1103 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1104 le32_to_cpu(es->s_blocks_count_lo);
1105 }
1106
1107 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1108 {
1109 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1110 le32_to_cpu(es->s_r_blocks_count_lo);
1111 }
1112
1113 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1114 {
1115 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1116 le32_to_cpu(es->s_free_blocks_count_lo);
1117 }
1118
1119 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1120 ext4_fsblk_t blk)
1121 {
1122 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1123 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1124 }
1125
1126 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1127 ext4_fsblk_t blk)
1128 {
1129 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1130 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1131 }
1132
1133 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1134 ext4_fsblk_t blk)
1135 {
1136 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1137 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1138 }
1139
1140 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1141 {
1142 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1143 le32_to_cpu(raw_inode->i_size_lo);
1144 }
1145
1146 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1147 {
1148 raw_inode->i_size_lo = cpu_to_le32(i_size);
1149 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1150 }
1151
1152 static inline
1153 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1154 ext4_group_t group)
1155 {
1156 struct ext4_group_info ***grp_info;
1157 long indexv, indexh;
1158 grp_info = EXT4_SB(sb)->s_group_info;
1159 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1160 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1161 return grp_info[indexv][indexh];
1162 }
1163
1164
1165 #define ext4_std_error(sb, errno) \
1166 do { \
1167 if ((errno)) \
1168 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1169 } while (0)
1170
1171 /*
1172 * Inodes and files operations
1173 */
1174
1175 /* dir.c */
1176 extern const struct file_operations ext4_dir_operations;
1177
1178 /* file.c */
1179 extern const struct inode_operations ext4_file_inode_operations;
1180 extern const struct file_operations ext4_file_operations;
1181
1182 /* namei.c */
1183 extern const struct inode_operations ext4_dir_inode_operations;
1184 extern const struct inode_operations ext4_special_inode_operations;
1185
1186 /* symlink.c */
1187 extern const struct inode_operations ext4_symlink_inode_operations;
1188 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1189
1190 /* extents.c */
1191 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1192 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1193 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1194 ext4_lblk_t iblock,
1195 unsigned long max_blocks, struct buffer_head *bh_result,
1196 int create, int extend_disksize);
1197 extern void ext4_ext_truncate(struct inode *, struct page *);
1198 extern void ext4_ext_init(struct super_block *);
1199 extern void ext4_ext_release(struct super_block *);
1200 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1201 loff_t len);
1202 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1203 sector_t block, unsigned long max_blocks,
1204 struct buffer_head *bh, int create,
1205 int extend_disksize);
1206 #endif /* __KERNEL__ */
1207
1208 #endif /* _LINUX_EXT4_FS_H */
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