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[mirror_ubuntu-artful-kernel.git] / fs / ext4 / ext4.h
1 /*
2 * ext4.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 _EXT4_H
17 #define _EXT4_H
18
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <linux/ratelimit.h>
33 #include <crypto/hash.h>
34 #include <linux/falloc.h>
35 #ifdef __KERNEL__
36 #include <linux/compat.h>
37 #endif
38
39 /*
40 * The fourth extended filesystem constants/structures
41 */
42
43 /*
44 * Define EXT4FS_DEBUG to produce debug messages
45 */
46 #undef EXT4FS_DEBUG
47
48 /*
49 * Debug code
50 */
51 #ifdef EXT4FS_DEBUG
52 #define ext4_debug(f, a...) \
53 do { \
54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
55 __FILE__, __LINE__, __func__); \
56 printk(KERN_DEBUG f, ## a); \
57 } while (0)
58 #else
59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
60 #endif
61
62 /*
63 * Turn on EXT_DEBUG to get lots of info about extents operations.
64 */
65 #define EXT_DEBUG__
66 #ifdef EXT_DEBUG
67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
68 #else
69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
70 #endif
71
72 #define EXT4_ERROR_INODE(inode, fmt, a...) \
73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
74
75 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
77
78 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
80
81 /* data type for block offset of block group */
82 typedef int ext4_grpblk_t;
83
84 /* data type for filesystem-wide blocks number */
85 typedef unsigned long long ext4_fsblk_t;
86
87 /* data type for file logical block number */
88 typedef __u32 ext4_lblk_t;
89
90 /* data type for block group number */
91 typedef unsigned int ext4_group_t;
92
93 /*
94 * Flags used in mballoc's allocation_context flags field.
95 *
96 * Also used to show what's going on for debugging purposes when the
97 * flag field is exported via the traceport interface
98 */
99
100 /* prefer goal again. length */
101 #define EXT4_MB_HINT_MERGE 0x0001
102 /* blocks already reserved */
103 #define EXT4_MB_HINT_RESERVED 0x0002
104 /* metadata is being allocated */
105 #define EXT4_MB_HINT_METADATA 0x0004
106 /* first blocks in the file */
107 #define EXT4_MB_HINT_FIRST 0x0008
108 /* search for the best chunk */
109 #define EXT4_MB_HINT_BEST 0x0010
110 /* data is being allocated */
111 #define EXT4_MB_HINT_DATA 0x0020
112 /* don't preallocate (for tails) */
113 #define EXT4_MB_HINT_NOPREALLOC 0x0040
114 /* allocate for locality group */
115 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
116 /* allocate goal blocks or none */
117 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
118 /* goal is meaningful */
119 #define EXT4_MB_HINT_TRY_GOAL 0x0200
120 /* blocks already pre-reserved by delayed allocation */
121 #define EXT4_MB_DELALLOC_RESERVED 0x0400
122 /* We are doing stream allocation */
123 #define EXT4_MB_STREAM_ALLOC 0x0800
124 /* Use reserved root blocks if needed */
125 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
126 /* Use blocks from reserved pool */
127 #define EXT4_MB_USE_RESERVED 0x2000
128
129 struct ext4_allocation_request {
130 /* target inode for block we're allocating */
131 struct inode *inode;
132 /* how many blocks we want to allocate */
133 unsigned int len;
134 /* logical block in target inode */
135 ext4_lblk_t logical;
136 /* the closest logical allocated block to the left */
137 ext4_lblk_t lleft;
138 /* the closest logical allocated block to the right */
139 ext4_lblk_t lright;
140 /* phys. target (a hint) */
141 ext4_fsblk_t goal;
142 /* phys. block for the closest logical allocated block to the left */
143 ext4_fsblk_t pleft;
144 /* phys. block for the closest logical allocated block to the right */
145 ext4_fsblk_t pright;
146 /* flags. see above EXT4_MB_HINT_* */
147 unsigned int flags;
148 };
149
150 /*
151 * Logical to physical block mapping, used by ext4_map_blocks()
152 *
153 * This structure is used to pass requests into ext4_map_blocks() as
154 * well as to store the information returned by ext4_map_blocks(). It
155 * takes less room on the stack than a struct buffer_head.
156 */
157 #define EXT4_MAP_NEW (1 << BH_New)
158 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
159 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
160 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
161 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
162 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
163
164 struct ext4_map_blocks {
165 ext4_fsblk_t m_pblk;
166 ext4_lblk_t m_lblk;
167 unsigned int m_len;
168 unsigned int m_flags;
169 };
170
171 /*
172 * Flags for ext4_io_end->flags
173 */
174 #define EXT4_IO_END_UNWRITTEN 0x0001
175
176 /*
177 * For converting unwritten extents on a work queue. 'handle' is used for
178 * buffered writeback.
179 */
180 typedef struct ext4_io_end {
181 struct list_head list; /* per-file finished IO list */
182 handle_t *handle; /* handle reserved for extent
183 * conversion */
184 struct inode *inode; /* file being written to */
185 struct bio *bio; /* Linked list of completed
186 * bios covering the extent */
187 unsigned int flag; /* unwritten or not */
188 loff_t offset; /* offset in the file */
189 ssize_t size; /* size of the extent */
190 atomic_t count; /* reference counter */
191 } ext4_io_end_t;
192
193 struct ext4_io_submit {
194 int io_op;
195 struct bio *io_bio;
196 ext4_io_end_t *io_end;
197 sector_t io_next_block;
198 };
199
200 /*
201 * Special inodes numbers
202 */
203 #define EXT4_BAD_INO 1 /* Bad blocks inode */
204 #define EXT4_ROOT_INO 2 /* Root inode */
205 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
206 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
207 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
208 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
209 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
210 #define EXT4_JOURNAL_INO 8 /* Journal inode */
211
212 /* First non-reserved inode for old ext4 filesystems */
213 #define EXT4_GOOD_OLD_FIRST_INO 11
214
215 /*
216 * Maximal count of links to a file
217 */
218 #define EXT4_LINK_MAX 65000
219
220 /*
221 * Macro-instructions used to manage several block sizes
222 */
223 #define EXT4_MIN_BLOCK_SIZE 1024
224 #define EXT4_MAX_BLOCK_SIZE 65536
225 #define EXT4_MIN_BLOCK_LOG_SIZE 10
226 #define EXT4_MAX_BLOCK_LOG_SIZE 16
227 #ifdef __KERNEL__
228 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
229 #else
230 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
231 #endif
232 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
233 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
234 EXT4_SB(s)->s_cluster_bits)
235 #ifdef __KERNEL__
236 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
237 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
238 #else
239 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
240 #endif
241 #ifdef __KERNEL__
242 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
243 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
244 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
245 #else
246 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
247 EXT4_GOOD_OLD_INODE_SIZE : \
248 (s)->s_inode_size)
249 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
250 EXT4_GOOD_OLD_FIRST_INO : \
251 (s)->s_first_ino)
252 #endif
253 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
254
255 /* Translate a block number to a cluster number */
256 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
257 /* Translate a cluster number to a block number */
258 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
259 /* Translate # of blks to # of clusters */
260 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
261 (sbi)->s_cluster_bits)
262 /* Mask out the low bits to get the starting block of the cluster */
263 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
264 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
265 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
266 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
267 /* Get the cluster offset */
268 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
269 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
270 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
271 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
272
273 /*
274 * Structure of a blocks group descriptor
275 */
276 struct ext4_group_desc
277 {
278 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
279 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
280 __le32 bg_inode_table_lo; /* Inodes table block */
281 __le16 bg_free_blocks_count_lo;/* Free blocks count */
282 __le16 bg_free_inodes_count_lo;/* Free inodes count */
283 __le16 bg_used_dirs_count_lo; /* Directories count */
284 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
285 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
286 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
287 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
288 __le16 bg_itable_unused_lo; /* Unused inodes count */
289 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
290 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
291 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
292 __le32 bg_inode_table_hi; /* Inodes table block MSB */
293 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
294 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
295 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
296 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
297 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
298 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
299 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
300 __u32 bg_reserved;
301 };
302
303 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
304 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
305 sizeof(__le16))
306 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
307 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
308 sizeof(__le16))
309
310 /*
311 * Structure of a flex block group info
312 */
313
314 struct flex_groups {
315 atomic64_t free_clusters;
316 atomic_t free_inodes;
317 atomic_t used_dirs;
318 };
319
320 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
321 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
322 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
323
324 /*
325 * Macro-instructions used to manage group descriptors
326 */
327 #define EXT4_MIN_DESC_SIZE 32
328 #define EXT4_MIN_DESC_SIZE_64BIT 64
329 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
330 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
331 #ifdef __KERNEL__
332 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
333 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
335 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
336 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
337 #else
338 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
339 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
340 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
341 #endif
342
343 /*
344 * Constants relative to the data blocks
345 */
346 #define EXT4_NDIR_BLOCKS 12
347 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
348 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
349 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
350 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
351
352 /*
353 * Inode flags
354 */
355 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
356 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
357 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
358 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
359 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
360 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
361 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
362 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
363 /* Reserved for compression usage... */
364 #define EXT4_DIRTY_FL 0x00000100
365 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
366 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
367 /* nb: was previously EXT2_ECOMPR_FL */
368 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
369 /* End compression flags --- maybe not all used */
370 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
371 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
372 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
373 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
374 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
375 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
376 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
377 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
378 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
379 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
380 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
381 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
382
383 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
384 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
385
386 /* Flags that should be inherited by new inodes from their parent. */
387 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
388 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
389 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
390 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
391
392 /* Flags that are appropriate for regular files (all but dir-specific ones). */
393 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
394
395 /* Flags that are appropriate for non-directories/regular files. */
396 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
397
398 /* Mask out flags that are inappropriate for the given type of inode. */
399 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
400 {
401 if (S_ISDIR(mode))
402 return flags;
403 else if (S_ISREG(mode))
404 return flags & EXT4_REG_FLMASK;
405 else
406 return flags & EXT4_OTHER_FLMASK;
407 }
408
409 /*
410 * Inode flags used for atomic set/get
411 */
412 enum {
413 EXT4_INODE_SECRM = 0, /* Secure deletion */
414 EXT4_INODE_UNRM = 1, /* Undelete */
415 EXT4_INODE_COMPR = 2, /* Compress file */
416 EXT4_INODE_SYNC = 3, /* Synchronous updates */
417 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
418 EXT4_INODE_APPEND = 5, /* writes to file may only append */
419 EXT4_INODE_NODUMP = 6, /* do not dump file */
420 EXT4_INODE_NOATIME = 7, /* do not update atime */
421 /* Reserved for compression usage... */
422 EXT4_INODE_DIRTY = 8,
423 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
424 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
425 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
426 /* End compression flags --- maybe not all used */
427 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
428 EXT4_INODE_IMAGIC = 13, /* AFS directory */
429 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
430 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
431 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
432 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
433 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
434 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
435 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
436 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
437 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
438 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
439 };
440
441 /*
442 * Since it's pretty easy to mix up bit numbers and hex values, we use a
443 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
444 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
445 * any extra space in the compiled kernel image, otherwise, the build will fail.
446 * It's important that these values are the same, since we are using
447 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
448 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
449 * values found in ext2, ext3 and ext4 filesystems, and of course the values
450 * defined in e2fsprogs.
451 *
452 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
453 */
454 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
455 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
456
457 static inline void ext4_check_flag_values(void)
458 {
459 CHECK_FLAG_VALUE(SECRM);
460 CHECK_FLAG_VALUE(UNRM);
461 CHECK_FLAG_VALUE(COMPR);
462 CHECK_FLAG_VALUE(SYNC);
463 CHECK_FLAG_VALUE(IMMUTABLE);
464 CHECK_FLAG_VALUE(APPEND);
465 CHECK_FLAG_VALUE(NODUMP);
466 CHECK_FLAG_VALUE(NOATIME);
467 CHECK_FLAG_VALUE(DIRTY);
468 CHECK_FLAG_VALUE(COMPRBLK);
469 CHECK_FLAG_VALUE(NOCOMPR);
470 CHECK_FLAG_VALUE(ENCRYPT);
471 CHECK_FLAG_VALUE(INDEX);
472 CHECK_FLAG_VALUE(IMAGIC);
473 CHECK_FLAG_VALUE(JOURNAL_DATA);
474 CHECK_FLAG_VALUE(NOTAIL);
475 CHECK_FLAG_VALUE(DIRSYNC);
476 CHECK_FLAG_VALUE(TOPDIR);
477 CHECK_FLAG_VALUE(HUGE_FILE);
478 CHECK_FLAG_VALUE(EXTENTS);
479 CHECK_FLAG_VALUE(EA_INODE);
480 CHECK_FLAG_VALUE(EOFBLOCKS);
481 CHECK_FLAG_VALUE(INLINE_DATA);
482 CHECK_FLAG_VALUE(RESERVED);
483 }
484
485 /* Used to pass group descriptor data when online resize is done */
486 struct ext4_new_group_input {
487 __u32 group; /* Group number for this data */
488 __u64 block_bitmap; /* Absolute block number of block bitmap */
489 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
490 __u64 inode_table; /* Absolute block number of inode table start */
491 __u32 blocks_count; /* Total number of blocks in this group */
492 __u16 reserved_blocks; /* Number of reserved blocks in this group */
493 __u16 unused;
494 };
495
496 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
497 struct compat_ext4_new_group_input {
498 u32 group;
499 compat_u64 block_bitmap;
500 compat_u64 inode_bitmap;
501 compat_u64 inode_table;
502 u32 blocks_count;
503 u16 reserved_blocks;
504 u16 unused;
505 };
506 #endif
507
508 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
509 struct ext4_new_group_data {
510 __u32 group;
511 __u64 block_bitmap;
512 __u64 inode_bitmap;
513 __u64 inode_table;
514 __u32 blocks_count;
515 __u16 reserved_blocks;
516 __u16 unused;
517 __u32 free_blocks_count;
518 };
519
520 /* Indexes used to index group tables in ext4_new_group_data */
521 enum {
522 BLOCK_BITMAP = 0, /* block bitmap */
523 INODE_BITMAP, /* inode bitmap */
524 INODE_TABLE, /* inode tables */
525 GROUP_TABLE_COUNT,
526 };
527
528 /*
529 * Flags used by ext4_map_blocks()
530 */
531 /* Allocate any needed blocks and/or convert an unwritten
532 extent to be an initialized ext4 */
533 #define EXT4_GET_BLOCKS_CREATE 0x0001
534 /* Request the creation of an unwritten extent */
535 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
536 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
537 EXT4_GET_BLOCKS_CREATE)
538 /* Caller is from the delayed allocation writeout path
539 * finally doing the actual allocation of delayed blocks */
540 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
541 /* caller is from the direct IO path, request to creation of an
542 unwritten extents if not allocated, split the unwritten
543 extent if blocks has been preallocated already*/
544 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
545 #define EXT4_GET_BLOCKS_CONVERT 0x0010
546 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
547 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
548 /* Convert extent to initialized after IO complete */
549 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
550 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
551 /* Eventual metadata allocation (due to growing extent tree)
552 * should not fail, so try to use reserved blocks for that.*/
553 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
554 /* Don't normalize allocation size (used for fallocate) */
555 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
556 /* Request will not result in inode size update (user for fallocate) */
557 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
558 /* Do not take i_data_sem locking in ext4_map_blocks */
559 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
560 /* Convert written extents to unwritten */
561 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
562
563 /*
564 * The bit position of these flags must not overlap with any of the
565 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
566 * read_extent_tree_block(), ext4_split_extent_at(),
567 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
568 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
569 * caching the extents when reading from the extent tree while a
570 * truncate or punch hole operation is in progress.
571 */
572 #define EXT4_EX_NOCACHE 0x40000000
573 #define EXT4_EX_FORCE_CACHE 0x20000000
574
575 /*
576 * Flags used by ext4_free_blocks
577 */
578 #define EXT4_FREE_BLOCKS_METADATA 0x0001
579 #define EXT4_FREE_BLOCKS_FORGET 0x0002
580 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
581 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
582 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
583 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
584
585 /* Encryption algorithms */
586 #define EXT4_ENCRYPTION_MODE_INVALID 0
587 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
588 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
589 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
590 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
591
592 #include "ext4_crypto.h"
593
594 /*
595 * ioctl commands
596 */
597 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
598 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
599 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
600 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
601 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
602 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
603 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
604 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
605 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
606 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
607 #define EXT4_IOC_MIGRATE _IO('f', 9)
608 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
609 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
610 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
611 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
612 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
613 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
614 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
615 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy)
616 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
617 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)
618
619 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
620 /*
621 * ioctl commands in 32 bit emulation
622 */
623 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
624 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
625 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
626 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
627 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
628 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
629 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
630 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
631 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
632 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
633 #endif
634
635 /* Max physical block we can address w/o extents */
636 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
637
638 /*
639 * Structure of an inode on the disk
640 */
641 struct ext4_inode {
642 __le16 i_mode; /* File mode */
643 __le16 i_uid; /* Low 16 bits of Owner Uid */
644 __le32 i_size_lo; /* Size in bytes */
645 __le32 i_atime; /* Access time */
646 __le32 i_ctime; /* Inode Change time */
647 __le32 i_mtime; /* Modification time */
648 __le32 i_dtime; /* Deletion Time */
649 __le16 i_gid; /* Low 16 bits of Group Id */
650 __le16 i_links_count; /* Links count */
651 __le32 i_blocks_lo; /* Blocks count */
652 __le32 i_flags; /* File flags */
653 union {
654 struct {
655 __le32 l_i_version;
656 } linux1;
657 struct {
658 __u32 h_i_translator;
659 } hurd1;
660 struct {
661 __u32 m_i_reserved1;
662 } masix1;
663 } osd1; /* OS dependent 1 */
664 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
665 __le32 i_generation; /* File version (for NFS) */
666 __le32 i_file_acl_lo; /* File ACL */
667 __le32 i_size_high;
668 __le32 i_obso_faddr; /* Obsoleted fragment address */
669 union {
670 struct {
671 __le16 l_i_blocks_high; /* were l_i_reserved1 */
672 __le16 l_i_file_acl_high;
673 __le16 l_i_uid_high; /* these 2 fields */
674 __le16 l_i_gid_high; /* were reserved2[0] */
675 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
676 __le16 l_i_reserved;
677 } linux2;
678 struct {
679 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
680 __u16 h_i_mode_high;
681 __u16 h_i_uid_high;
682 __u16 h_i_gid_high;
683 __u32 h_i_author;
684 } hurd2;
685 struct {
686 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
687 __le16 m_i_file_acl_high;
688 __u32 m_i_reserved2[2];
689 } masix2;
690 } osd2; /* OS dependent 2 */
691 __le16 i_extra_isize;
692 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
693 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
694 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
695 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
696 __le32 i_crtime; /* File Creation time */
697 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
698 __le32 i_version_hi; /* high 32 bits for 64-bit version */
699 };
700
701 struct move_extent {
702 __u32 reserved; /* should be zero */
703 __u32 donor_fd; /* donor file descriptor */
704 __u64 orig_start; /* logical start offset in block for orig */
705 __u64 donor_start; /* logical start offset in block for donor */
706 __u64 len; /* block length to be moved */
707 __u64 moved_len; /* moved block length */
708 };
709
710 #define EXT4_EPOCH_BITS 2
711 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
712 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
713
714 /*
715 * Extended fields will fit into an inode if the filesystem was formatted
716 * with large inodes (-I 256 or larger) and there are not currently any EAs
717 * consuming all of the available space. For new inodes we always reserve
718 * enough space for the kernel's known extended fields, but for inodes
719 * created with an old kernel this might not have been the case. None of
720 * the extended inode fields is critical for correct filesystem operation.
721 * This macro checks if a certain field fits in the inode. Note that
722 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
723 */
724 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
725 ((offsetof(typeof(*ext4_inode), field) + \
726 sizeof((ext4_inode)->field)) \
727 <= (EXT4_GOOD_OLD_INODE_SIZE + \
728 (einode)->i_extra_isize)) \
729
730 static inline __le32 ext4_encode_extra_time(struct timespec *time)
731 {
732 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
733 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
734 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
735 }
736
737 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
738 {
739 if (sizeof(time->tv_sec) > 4)
740 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
741 << 32;
742 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
743 }
744
745 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
746 do { \
747 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
748 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
749 (raw_inode)->xtime ## _extra = \
750 ext4_encode_extra_time(&(inode)->xtime); \
751 } while (0)
752
753 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
754 do { \
755 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
756 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
757 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
758 (raw_inode)->xtime ## _extra = \
759 ext4_encode_extra_time(&(einode)->xtime); \
760 } while (0)
761
762 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
763 do { \
764 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
765 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
766 ext4_decode_extra_time(&(inode)->xtime, \
767 raw_inode->xtime ## _extra); \
768 else \
769 (inode)->xtime.tv_nsec = 0; \
770 } while (0)
771
772 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
773 do { \
774 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
775 (einode)->xtime.tv_sec = \
776 (signed)le32_to_cpu((raw_inode)->xtime); \
777 else \
778 (einode)->xtime.tv_sec = 0; \
779 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
780 ext4_decode_extra_time(&(einode)->xtime, \
781 raw_inode->xtime ## _extra); \
782 else \
783 (einode)->xtime.tv_nsec = 0; \
784 } while (0)
785
786 #define i_disk_version osd1.linux1.l_i_version
787
788 #if defined(__KERNEL__) || defined(__linux__)
789 #define i_reserved1 osd1.linux1.l_i_reserved1
790 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
791 #define i_blocks_high osd2.linux2.l_i_blocks_high
792 #define i_uid_low i_uid
793 #define i_gid_low i_gid
794 #define i_uid_high osd2.linux2.l_i_uid_high
795 #define i_gid_high osd2.linux2.l_i_gid_high
796 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
797
798 #elif defined(__GNU__)
799
800 #define i_translator osd1.hurd1.h_i_translator
801 #define i_uid_high osd2.hurd2.h_i_uid_high
802 #define i_gid_high osd2.hurd2.h_i_gid_high
803 #define i_author osd2.hurd2.h_i_author
804
805 #elif defined(__masix__)
806
807 #define i_reserved1 osd1.masix1.m_i_reserved1
808 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
809 #define i_reserved2 osd2.masix2.m_i_reserved2
810
811 #endif /* defined(__KERNEL__) || defined(__linux__) */
812
813 #include "extents_status.h"
814
815 /*
816 * fourth extended file system inode data in memory
817 */
818 struct ext4_inode_info {
819 __le32 i_data[15]; /* unconverted */
820 __u32 i_dtime;
821 ext4_fsblk_t i_file_acl;
822
823 /*
824 * i_block_group is the number of the block group which contains
825 * this file's inode. Constant across the lifetime of the inode,
826 * it is ued for making block allocation decisions - we try to
827 * place a file's data blocks near its inode block, and new inodes
828 * near to their parent directory's inode.
829 */
830 ext4_group_t i_block_group;
831 ext4_lblk_t i_dir_start_lookup;
832 #if (BITS_PER_LONG < 64)
833 unsigned long i_state_flags; /* Dynamic state flags */
834 #endif
835 unsigned long i_flags;
836
837 /*
838 * Extended attributes can be read independently of the main file
839 * data. Taking i_mutex even when reading would cause contention
840 * between readers of EAs and writers of regular file data, so
841 * instead we synchronize on xattr_sem when reading or changing
842 * EAs.
843 */
844 struct rw_semaphore xattr_sem;
845
846 struct list_head i_orphan; /* unlinked but open inodes */
847
848 /*
849 * i_disksize keeps track of what the inode size is ON DISK, not
850 * in memory. During truncate, i_size is set to the new size by
851 * the VFS prior to calling ext4_truncate(), but the filesystem won't
852 * set i_disksize to 0 until the truncate is actually under way.
853 *
854 * The intent is that i_disksize always represents the blocks which
855 * are used by this file. This allows recovery to restart truncate
856 * on orphans if we crash during truncate. We actually write i_disksize
857 * into the on-disk inode when writing inodes out, instead of i_size.
858 *
859 * The only time when i_disksize and i_size may be different is when
860 * a truncate is in progress. The only things which change i_disksize
861 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
862 */
863 loff_t i_disksize;
864
865 /*
866 * i_data_sem is for serialising ext4_truncate() against
867 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
868 * data tree are chopped off during truncate. We can't do that in
869 * ext4 because whenever we perform intermediate commits during
870 * truncate, the inode and all the metadata blocks *must* be in a
871 * consistent state which allows truncation of the orphans to restart
872 * during recovery. Hence we must fix the get_block-vs-truncate race
873 * by other means, so we have i_data_sem.
874 */
875 struct rw_semaphore i_data_sem;
876 struct inode vfs_inode;
877 struct jbd2_inode *jinode;
878
879 spinlock_t i_raw_lock; /* protects updates to the raw inode */
880
881 /*
882 * File creation time. Its function is same as that of
883 * struct timespec i_{a,c,m}time in the generic inode.
884 */
885 struct timespec i_crtime;
886
887 /* mballoc */
888 struct list_head i_prealloc_list;
889 spinlock_t i_prealloc_lock;
890
891 /* extents status tree */
892 struct ext4_es_tree i_es_tree;
893 rwlock_t i_es_lock;
894 struct list_head i_es_list;
895 unsigned int i_es_all_nr; /* protected by i_es_lock */
896 unsigned int i_es_shk_nr; /* protected by i_es_lock */
897 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
898 extents to shrink. Protected by
899 i_es_lock */
900
901 /* ialloc */
902 ext4_group_t i_last_alloc_group;
903
904 /* allocation reservation info for delalloc */
905 /* In case of bigalloc, these refer to clusters rather than blocks */
906 unsigned int i_reserved_data_blocks;
907 unsigned int i_reserved_meta_blocks;
908 unsigned int i_allocated_meta_blocks;
909 ext4_lblk_t i_da_metadata_calc_last_lblock;
910 int i_da_metadata_calc_len;
911
912 /* on-disk additional length */
913 __u16 i_extra_isize;
914 char i_crypt_policy_flags;
915
916 /* Indicate the inline data space. */
917 u16 i_inline_off;
918 u16 i_inline_size;
919
920 #ifdef CONFIG_QUOTA
921 /* quota space reservation, managed internally by quota code */
922 qsize_t i_reserved_quota;
923 #endif
924
925 /* Lock protecting lists below */
926 spinlock_t i_completed_io_lock;
927 /*
928 * Completed IOs that need unwritten extents handling and have
929 * transaction reserved
930 */
931 struct list_head i_rsv_conversion_list;
932 /*
933 * Completed IOs that need unwritten extents handling and don't have
934 * transaction reserved
935 */
936 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
937 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
938 struct work_struct i_rsv_conversion_work;
939
940 spinlock_t i_block_reservation_lock;
941
942 /*
943 * Transactions that contain inode's metadata needed to complete
944 * fsync and fdatasync, respectively.
945 */
946 tid_t i_sync_tid;
947 tid_t i_datasync_tid;
948
949 #ifdef CONFIG_QUOTA
950 struct dquot *i_dquot[MAXQUOTAS];
951 #endif
952
953 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
954 __u32 i_csum_seed;
955
956 #ifdef CONFIG_EXT4_FS_ENCRYPTION
957 /* Encryption params */
958 struct ext4_encryption_key i_encryption_key;
959 #endif
960 };
961
962 /*
963 * File system states
964 */
965 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
966 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
967 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
968
969 /*
970 * Misc. filesystem flags
971 */
972 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
973 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
974 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
975
976 /*
977 * Mount flags set via mount options or defaults
978 */
979 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
980 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
981 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
982 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
983 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
984 #define EXT4_MOUNT_ERRORS_MASK 0x00070
985 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
986 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
987 #ifdef CONFIG_FS_DAX
988 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
989 #else
990 #define EXT4_MOUNT_DAX 0
991 #endif
992 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
993 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
994 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
995 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
996 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
997 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
998 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
999 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1000 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1001 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1002 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
1003 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
1004 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
1005 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1006 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1007 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1008 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1009 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1010 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1011 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1012 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1013
1014 /*
1015 * Mount flags set either automatically (could not be set by mount option)
1016 * based on per file system feature or property or in special cases such as
1017 * distinguishing between explicit mount option definition and default.
1018 */
1019 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1020 specified delalloc */
1021 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1022 size of blocksize * 8
1023 blocks */
1024 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1025 file systems */
1026
1027 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1028 ~EXT4_MOUNT_##opt
1029 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1030 EXT4_MOUNT_##opt
1031 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1032 EXT4_MOUNT_##opt)
1033
1034 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1035 ~EXT4_MOUNT2_##opt
1036 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1037 EXT4_MOUNT2_##opt
1038 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1039 EXT4_MOUNT2_##opt)
1040
1041 #define ext4_test_and_set_bit __test_and_set_bit_le
1042 #define ext4_set_bit __set_bit_le
1043 #define ext4_set_bit_atomic ext2_set_bit_atomic
1044 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1045 #define ext4_clear_bit __clear_bit_le
1046 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1047 #define ext4_test_bit test_bit_le
1048 #define ext4_find_next_zero_bit find_next_zero_bit_le
1049 #define ext4_find_next_bit find_next_bit_le
1050
1051 extern void ext4_set_bits(void *bm, int cur, int len);
1052
1053 /*
1054 * Maximal mount counts between two filesystem checks
1055 */
1056 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1057 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1058
1059 /*
1060 * Behaviour when detecting errors
1061 */
1062 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1063 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1064 #define EXT4_ERRORS_PANIC 3 /* Panic */
1065 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1066
1067 /* Metadata checksum algorithm codes */
1068 #define EXT4_CRC32C_CHKSUM 1
1069
1070 /*
1071 * Structure of the super block
1072 */
1073 struct ext4_super_block {
1074 /*00*/ __le32 s_inodes_count; /* Inodes count */
1075 __le32 s_blocks_count_lo; /* Blocks count */
1076 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1077 __le32 s_free_blocks_count_lo; /* Free blocks count */
1078 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1079 __le32 s_first_data_block; /* First Data Block */
1080 __le32 s_log_block_size; /* Block size */
1081 __le32 s_log_cluster_size; /* Allocation cluster size */
1082 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1083 __le32 s_clusters_per_group; /* # Clusters per group */
1084 __le32 s_inodes_per_group; /* # Inodes per group */
1085 __le32 s_mtime; /* Mount time */
1086 /*30*/ __le32 s_wtime; /* Write time */
1087 __le16 s_mnt_count; /* Mount count */
1088 __le16 s_max_mnt_count; /* Maximal mount count */
1089 __le16 s_magic; /* Magic signature */
1090 __le16 s_state; /* File system state */
1091 __le16 s_errors; /* Behaviour when detecting errors */
1092 __le16 s_minor_rev_level; /* minor revision level */
1093 /*40*/ __le32 s_lastcheck; /* time of last check */
1094 __le32 s_checkinterval; /* max. time between checks */
1095 __le32 s_creator_os; /* OS */
1096 __le32 s_rev_level; /* Revision level */
1097 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1098 __le16 s_def_resgid; /* Default gid for reserved blocks */
1099 /*
1100 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1101 *
1102 * Note: the difference between the compatible feature set and
1103 * the incompatible feature set is that if there is a bit set
1104 * in the incompatible feature set that the kernel doesn't
1105 * know about, it should refuse to mount the filesystem.
1106 *
1107 * e2fsck's requirements are more strict; if it doesn't know
1108 * about a feature in either the compatible or incompatible
1109 * feature set, it must abort and not try to meddle with
1110 * things it doesn't understand...
1111 */
1112 __le32 s_first_ino; /* First non-reserved inode */
1113 __le16 s_inode_size; /* size of inode structure */
1114 __le16 s_block_group_nr; /* block group # of this superblock */
1115 __le32 s_feature_compat; /* compatible feature set */
1116 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1117 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1118 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1119 /*78*/ char s_volume_name[16]; /* volume name */
1120 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1121 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1122 /*
1123 * Performance hints. Directory preallocation should only
1124 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1125 */
1126 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1127 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1128 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1129 /*
1130 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1131 */
1132 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1133 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1134 __le32 s_journal_dev; /* device number of journal file */
1135 __le32 s_last_orphan; /* start of list of inodes to delete */
1136 __le32 s_hash_seed[4]; /* HTREE hash seed */
1137 __u8 s_def_hash_version; /* Default hash version to use */
1138 __u8 s_jnl_backup_type;
1139 __le16 s_desc_size; /* size of group descriptor */
1140 /*100*/ __le32 s_default_mount_opts;
1141 __le32 s_first_meta_bg; /* First metablock block group */
1142 __le32 s_mkfs_time; /* When the filesystem was created */
1143 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1144 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1145 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1146 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1147 __le32 s_free_blocks_count_hi; /* Free blocks count */
1148 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1149 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1150 __le32 s_flags; /* Miscellaneous flags */
1151 __le16 s_raid_stride; /* RAID stride */
1152 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1153 __le64 s_mmp_block; /* Block for multi-mount protection */
1154 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1155 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1156 __u8 s_checksum_type; /* metadata checksum algorithm used */
1157 __u8 s_encryption_level; /* versioning level for encryption */
1158 __u8 s_reserved_pad; /* Padding to next 32bits */
1159 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1160 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1161 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1162 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1163 snapshot's future use */
1164 __le32 s_snapshot_list; /* inode number of the head of the
1165 on-disk snapshot list */
1166 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1167 __le32 s_error_count; /* number of fs errors */
1168 __le32 s_first_error_time; /* first time an error happened */
1169 __le32 s_first_error_ino; /* inode involved in first error */
1170 __le64 s_first_error_block; /* block involved of first error */
1171 __u8 s_first_error_func[32]; /* function where the error happened */
1172 __le32 s_first_error_line; /* line number where error happened */
1173 __le32 s_last_error_time; /* most recent time of an error */
1174 __le32 s_last_error_ino; /* inode involved in last error */
1175 __le32 s_last_error_line; /* line number where error happened */
1176 __le64 s_last_error_block; /* block involved of last error */
1177 __u8 s_last_error_func[32]; /* function where the error happened */
1178 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1179 __u8 s_mount_opts[64];
1180 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1181 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1182 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1183 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1184 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1185 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1186 __le32 s_lpf_ino; /* Location of the lost+found inode */
1187 __le32 s_reserved[100]; /* Padding to the end of the block */
1188 __le32 s_checksum; /* crc32c(superblock) */
1189 };
1190
1191 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1192
1193 #ifdef __KERNEL__
1194
1195 /*
1196 * run-time mount flags
1197 */
1198 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1199 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1200 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1201
1202 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1203 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1204 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1205 #else
1206 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1207 #endif
1208
1209 /* Number of quota types we support */
1210 #define EXT4_MAXQUOTAS 2
1211
1212 /*
1213 * fourth extended-fs super-block data in memory
1214 */
1215 struct ext4_sb_info {
1216 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1217 unsigned long s_inodes_per_block;/* Number of inodes per block */
1218 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1219 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1220 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1221 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1222 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1223 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1224 ext4_group_t s_groups_count; /* Number of groups in the fs */
1225 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1226 unsigned long s_overhead; /* # of fs overhead clusters */
1227 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1228 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1229 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1230 struct buffer_head * s_sbh; /* Buffer containing the super block */
1231 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1232 struct buffer_head **s_group_desc;
1233 unsigned int s_mount_opt;
1234 unsigned int s_mount_opt2;
1235 unsigned int s_mount_flags;
1236 unsigned int s_def_mount_opt;
1237 ext4_fsblk_t s_sb_block;
1238 atomic64_t s_resv_clusters;
1239 kuid_t s_resuid;
1240 kgid_t s_resgid;
1241 unsigned short s_mount_state;
1242 unsigned short s_pad;
1243 int s_addr_per_block_bits;
1244 int s_desc_per_block_bits;
1245 int s_inode_size;
1246 int s_first_ino;
1247 unsigned int s_inode_readahead_blks;
1248 unsigned int s_inode_goal;
1249 spinlock_t s_next_gen_lock;
1250 u32 s_next_generation;
1251 u32 s_hash_seed[4];
1252 int s_def_hash_version;
1253 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1254 struct percpu_counter s_freeclusters_counter;
1255 struct percpu_counter s_freeinodes_counter;
1256 struct percpu_counter s_dirs_counter;
1257 struct percpu_counter s_dirtyclusters_counter;
1258 struct blockgroup_lock *s_blockgroup_lock;
1259 struct proc_dir_entry *s_proc;
1260 struct kobject s_kobj;
1261 struct completion s_kobj_unregister;
1262 struct super_block *s_sb;
1263
1264 /* Journaling */
1265 struct journal_s *s_journal;
1266 struct list_head s_orphan;
1267 struct mutex s_orphan_lock;
1268 unsigned long s_resize_flags; /* Flags indicating if there
1269 is a resizer */
1270 unsigned long s_commit_interval;
1271 u32 s_max_batch_time;
1272 u32 s_min_batch_time;
1273 struct block_device *journal_bdev;
1274 #ifdef CONFIG_QUOTA
1275 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
1276 int s_jquota_fmt; /* Format of quota to use */
1277 #endif
1278 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1279 struct rb_root system_blks;
1280
1281 #ifdef EXTENTS_STATS
1282 /* ext4 extents stats */
1283 unsigned long s_ext_min;
1284 unsigned long s_ext_max;
1285 unsigned long s_depth_max;
1286 spinlock_t s_ext_stats_lock;
1287 unsigned long s_ext_blocks;
1288 unsigned long s_ext_extents;
1289 #endif
1290
1291 /* for buddy allocator */
1292 struct ext4_group_info ***s_group_info;
1293 struct inode *s_buddy_cache;
1294 spinlock_t s_md_lock;
1295 unsigned short *s_mb_offsets;
1296 unsigned int *s_mb_maxs;
1297 unsigned int s_group_info_size;
1298
1299 /* tunables */
1300 unsigned long s_stripe;
1301 unsigned int s_mb_stream_request;
1302 unsigned int s_mb_max_to_scan;
1303 unsigned int s_mb_min_to_scan;
1304 unsigned int s_mb_stats;
1305 unsigned int s_mb_order2_reqs;
1306 unsigned int s_mb_group_prealloc;
1307 unsigned int s_max_dir_size_kb;
1308 /* where last allocation was done - for stream allocation */
1309 unsigned long s_mb_last_group;
1310 unsigned long s_mb_last_start;
1311
1312 /* stats for buddy allocator */
1313 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1314 atomic_t s_bal_success; /* we found long enough chunks */
1315 atomic_t s_bal_allocated; /* in blocks */
1316 atomic_t s_bal_ex_scanned; /* total extents scanned */
1317 atomic_t s_bal_goals; /* goal hits */
1318 atomic_t s_bal_breaks; /* too long searches */
1319 atomic_t s_bal_2orders; /* 2^order hits */
1320 spinlock_t s_bal_lock;
1321 unsigned long s_mb_buddies_generated;
1322 unsigned long long s_mb_generation_time;
1323 atomic_t s_mb_lost_chunks;
1324 atomic_t s_mb_preallocated;
1325 atomic_t s_mb_discarded;
1326 atomic_t s_lock_busy;
1327
1328 /* locality groups */
1329 struct ext4_locality_group __percpu *s_locality_groups;
1330
1331 /* for write statistics */
1332 unsigned long s_sectors_written_start;
1333 u64 s_kbytes_written;
1334
1335 /* the size of zero-out chunk */
1336 unsigned int s_extent_max_zeroout_kb;
1337
1338 unsigned int s_log_groups_per_flex;
1339 struct flex_groups *s_flex_groups;
1340 ext4_group_t s_flex_groups_allocated;
1341
1342 /* workqueue for reserved extent conversions (buffered io) */
1343 struct workqueue_struct *rsv_conversion_wq;
1344
1345 /* timer for periodic error stats printing */
1346 struct timer_list s_err_report;
1347
1348 /* Lazy inode table initialization info */
1349 struct ext4_li_request *s_li_request;
1350 /* Wait multiplier for lazy initialization thread */
1351 unsigned int s_li_wait_mult;
1352
1353 /* Kernel thread for multiple mount protection */
1354 struct task_struct *s_mmp_tsk;
1355
1356 /* record the last minlen when FITRIM is called. */
1357 atomic_t s_last_trim_minblks;
1358
1359 /* Reference to checksum algorithm driver via cryptoapi */
1360 struct crypto_shash *s_chksum_driver;
1361
1362 /* Precomputed FS UUID checksum for seeding other checksums */
1363 __u32 s_csum_seed;
1364
1365 /* Reclaim extents from extent status tree */
1366 struct shrinker s_es_shrinker;
1367 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1368 long s_es_nr_inode;
1369 struct ext4_es_stats s_es_stats;
1370 struct mb_cache *s_mb_cache;
1371 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1372
1373 /* Ratelimit ext4 messages. */
1374 struct ratelimit_state s_err_ratelimit_state;
1375 struct ratelimit_state s_warning_ratelimit_state;
1376 struct ratelimit_state s_msg_ratelimit_state;
1377
1378 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1379 /* Encryption */
1380 uint32_t s_file_encryption_mode;
1381 uint32_t s_dir_encryption_mode;
1382 #endif
1383 };
1384
1385 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1386 {
1387 return sb->s_fs_info;
1388 }
1389 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1390 {
1391 return container_of(inode, struct ext4_inode_info, vfs_inode);
1392 }
1393
1394 static inline struct timespec ext4_current_time(struct inode *inode)
1395 {
1396 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1397 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1398 }
1399
1400 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1401 {
1402 return ino == EXT4_ROOT_INO ||
1403 ino == EXT4_USR_QUOTA_INO ||
1404 ino == EXT4_GRP_QUOTA_INO ||
1405 ino == EXT4_BOOT_LOADER_INO ||
1406 ino == EXT4_JOURNAL_INO ||
1407 ino == EXT4_RESIZE_INO ||
1408 (ino >= EXT4_FIRST_INO(sb) &&
1409 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1410 }
1411
1412 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1413 struct ext4_io_end *io_end)
1414 {
1415 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1416 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1417 atomic_inc(&EXT4_I(inode)->i_unwritten);
1418 }
1419 }
1420
1421 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1422 {
1423 return inode->i_private;
1424 }
1425
1426 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1427 {
1428 inode->i_private = io;
1429 }
1430
1431 /*
1432 * Inode dynamic state flags
1433 */
1434 enum {
1435 EXT4_STATE_JDATA, /* journaled data exists */
1436 EXT4_STATE_NEW, /* inode is newly created */
1437 EXT4_STATE_XATTR, /* has in-inode xattrs */
1438 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1439 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1440 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1441 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1442 EXT4_STATE_NEWENTRY, /* File just added to dir */
1443 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1444 nolocking */
1445 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1446 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1447 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1448 };
1449
1450 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1451 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1452 { \
1453 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1454 } \
1455 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1456 { \
1457 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1458 } \
1459 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1460 { \
1461 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1462 }
1463
1464 /* Add these declarations here only so that these functions can be
1465 * found by name. Otherwise, they are very hard to locate. */
1466 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1467 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1468 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1469 EXT4_INODE_BIT_FNS(flag, flags, 0)
1470
1471 /* Add these declarations here only so that these functions can be
1472 * found by name. Otherwise, they are very hard to locate. */
1473 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1474 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1475 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1476 #if (BITS_PER_LONG < 64)
1477 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1478
1479 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1480 {
1481 (ei)->i_state_flags = 0;
1482 }
1483 #else
1484 EXT4_INODE_BIT_FNS(state, flags, 32)
1485
1486 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1487 {
1488 /* We depend on the fact that callers will set i_flags */
1489 }
1490 #endif
1491 #else
1492 /* Assume that user mode programs are passing in an ext4fs superblock, not
1493 * a kernel struct super_block. This will allow us to call the feature-test
1494 * macros from user land. */
1495 #define EXT4_SB(sb) (sb)
1496 #endif
1497
1498 /*
1499 * Returns true if the inode is inode is encrypted
1500 */
1501 static inline int ext4_encrypted_inode(struct inode *inode)
1502 {
1503 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1504 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1505 #else
1506 return 0;
1507 #endif
1508 }
1509
1510 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1511
1512 /*
1513 * Codes for operating systems
1514 */
1515 #define EXT4_OS_LINUX 0
1516 #define EXT4_OS_HURD 1
1517 #define EXT4_OS_MASIX 2
1518 #define EXT4_OS_FREEBSD 3
1519 #define EXT4_OS_LITES 4
1520
1521 /*
1522 * Revision levels
1523 */
1524 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1525 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1526
1527 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1528 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1529
1530 #define EXT4_GOOD_OLD_INODE_SIZE 128
1531
1532 /*
1533 * Feature set definitions
1534 */
1535
1536 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1537 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1538 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1539 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1540 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1541 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1542 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1543 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1544 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1545 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1546 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1547 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1548 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1549 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1550 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1551 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1552 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1553 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1554
1555 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1556 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1557 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1558 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1559 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1560 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1561 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1562
1563 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1564 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1565 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1566 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1567 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1568 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1569 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1570 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1571 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1572 /*
1573 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1574 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1575 * all other data structures' checksums. However, the METADATA_CSUM and
1576 * GDT_CSUM bits are mutually exclusive.
1577 */
1578 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1579 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1580
1581 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1582 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1583 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1584 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1585 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1586 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1587 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1588 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1589 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1590 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1591 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1592 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1593 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1594 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1595 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1596
1597 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1598 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1599 EXT4_FEATURE_INCOMPAT_META_BG)
1600 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1601 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1602 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1603
1604 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1605 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1606 EXT4_FEATURE_INCOMPAT_RECOVER| \
1607 EXT4_FEATURE_INCOMPAT_META_BG)
1608 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1609 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1610 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1611
1612 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1613 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1614 EXT4_FEATURE_INCOMPAT_RECOVER| \
1615 EXT4_FEATURE_INCOMPAT_META_BG| \
1616 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1617 EXT4_FEATURE_INCOMPAT_64BIT| \
1618 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1619 EXT4_FEATURE_INCOMPAT_MMP | \
1620 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1621 EXT4_FEATURE_INCOMPAT_ENCRYPT)
1622 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1623 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1624 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1625 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1626 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1627 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1628 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1629 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1630 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1631 EXT4_FEATURE_RO_COMPAT_QUOTA)
1632
1633 /*
1634 * Default values for user and/or group using reserved blocks
1635 */
1636 #define EXT4_DEF_RESUID 0
1637 #define EXT4_DEF_RESGID 0
1638
1639 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1640
1641 /*
1642 * Default mount options
1643 */
1644 #define EXT4_DEFM_DEBUG 0x0001
1645 #define EXT4_DEFM_BSDGROUPS 0x0002
1646 #define EXT4_DEFM_XATTR_USER 0x0004
1647 #define EXT4_DEFM_ACL 0x0008
1648 #define EXT4_DEFM_UID16 0x0010
1649 #define EXT4_DEFM_JMODE 0x0060
1650 #define EXT4_DEFM_JMODE_DATA 0x0020
1651 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1652 #define EXT4_DEFM_JMODE_WBACK 0x0060
1653 #define EXT4_DEFM_NOBARRIER 0x0100
1654 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1655 #define EXT4_DEFM_DISCARD 0x0400
1656 #define EXT4_DEFM_NODELALLOC 0x0800
1657
1658 /*
1659 * Default journal batch times
1660 */
1661 #define EXT4_DEF_MIN_BATCH_TIME 0
1662 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1663
1664 /*
1665 * Minimum number of groups in a flexgroup before we separate out
1666 * directories into the first block group of a flexgroup
1667 */
1668 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1669
1670 /*
1671 * Structure of a directory entry
1672 */
1673 #define EXT4_NAME_LEN 255
1674
1675 struct ext4_dir_entry {
1676 __le32 inode; /* Inode number */
1677 __le16 rec_len; /* Directory entry length */
1678 __le16 name_len; /* Name length */
1679 char name[EXT4_NAME_LEN]; /* File name */
1680 };
1681
1682 /*
1683 * The new version of the directory entry. Since EXT4 structures are
1684 * stored in intel byte order, and the name_len field could never be
1685 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1686 * file_type field.
1687 */
1688 struct ext4_dir_entry_2 {
1689 __le32 inode; /* Inode number */
1690 __le16 rec_len; /* Directory entry length */
1691 __u8 name_len; /* Name length */
1692 __u8 file_type;
1693 char name[EXT4_NAME_LEN]; /* File name */
1694 };
1695
1696 /*
1697 * This is a bogus directory entry at the end of each leaf block that
1698 * records checksums.
1699 */
1700 struct ext4_dir_entry_tail {
1701 __le32 det_reserved_zero1; /* Pretend to be unused */
1702 __le16 det_rec_len; /* 12 */
1703 __u8 det_reserved_zero2; /* Zero name length */
1704 __u8 det_reserved_ft; /* 0xDE, fake file type */
1705 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1706 };
1707
1708 #define EXT4_DIRENT_TAIL(block, blocksize) \
1709 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1710 ((blocksize) - \
1711 sizeof(struct ext4_dir_entry_tail))))
1712
1713 /*
1714 * Ext4 directory file types. Only the low 3 bits are used. The
1715 * other bits are reserved for now.
1716 */
1717 #define EXT4_FT_UNKNOWN 0
1718 #define EXT4_FT_REG_FILE 1
1719 #define EXT4_FT_DIR 2
1720 #define EXT4_FT_CHRDEV 3
1721 #define EXT4_FT_BLKDEV 4
1722 #define EXT4_FT_FIFO 5
1723 #define EXT4_FT_SOCK 6
1724 #define EXT4_FT_SYMLINK 7
1725
1726 #define EXT4_FT_MAX 8
1727
1728 #define EXT4_FT_DIR_CSUM 0xDE
1729
1730 /*
1731 * EXT4_DIR_PAD defines the directory entries boundaries
1732 *
1733 * NOTE: It must be a multiple of 4
1734 */
1735 #define EXT4_DIR_PAD 4
1736 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1737 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1738 ~EXT4_DIR_ROUND)
1739 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1740
1741 /*
1742 * If we ever get support for fs block sizes > page_size, we'll need
1743 * to remove the #if statements in the next two functions...
1744 */
1745 static inline unsigned int
1746 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1747 {
1748 unsigned len = le16_to_cpu(dlen);
1749
1750 #if (PAGE_CACHE_SIZE >= 65536)
1751 if (len == EXT4_MAX_REC_LEN || len == 0)
1752 return blocksize;
1753 return (len & 65532) | ((len & 3) << 16);
1754 #else
1755 return len;
1756 #endif
1757 }
1758
1759 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1760 {
1761 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1762 BUG();
1763 #if (PAGE_CACHE_SIZE >= 65536)
1764 if (len < 65536)
1765 return cpu_to_le16(len);
1766 if (len == blocksize) {
1767 if (blocksize == 65536)
1768 return cpu_to_le16(EXT4_MAX_REC_LEN);
1769 else
1770 return cpu_to_le16(0);
1771 }
1772 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1773 #else
1774 return cpu_to_le16(len);
1775 #endif
1776 }
1777
1778 /*
1779 * Hash Tree Directory indexing
1780 * (c) Daniel Phillips, 2001
1781 */
1782
1783 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1784 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1785 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1786 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1787 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1788
1789 /* Legal values for the dx_root hash_version field: */
1790
1791 #define DX_HASH_LEGACY 0
1792 #define DX_HASH_HALF_MD4 1
1793 #define DX_HASH_TEA 2
1794 #define DX_HASH_LEGACY_UNSIGNED 3
1795 #define DX_HASH_HALF_MD4_UNSIGNED 4
1796 #define DX_HASH_TEA_UNSIGNED 5
1797
1798 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1799 const void *address, unsigned int length)
1800 {
1801 struct {
1802 struct shash_desc shash;
1803 char ctx[4];
1804 } desc;
1805 int err;
1806
1807 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1808
1809 desc.shash.tfm = sbi->s_chksum_driver;
1810 desc.shash.flags = 0;
1811 *(u32 *)desc.ctx = crc;
1812
1813 err = crypto_shash_update(&desc.shash, address, length);
1814 BUG_ON(err);
1815
1816 return *(u32 *)desc.ctx;
1817 }
1818
1819 #ifdef __KERNEL__
1820
1821 /* hash info structure used by the directory hash */
1822 struct dx_hash_info
1823 {
1824 u32 hash;
1825 u32 minor_hash;
1826 int hash_version;
1827 u32 *seed;
1828 };
1829
1830
1831 /* 32 and 64 bit signed EOF for dx directories */
1832 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1833 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1834
1835
1836 /*
1837 * Control parameters used by ext4_htree_next_block
1838 */
1839 #define HASH_NB_ALWAYS 1
1840
1841
1842 /*
1843 * Describe an inode's exact location on disk and in memory
1844 */
1845 struct ext4_iloc
1846 {
1847 struct buffer_head *bh;
1848 unsigned long offset;
1849 ext4_group_t block_group;
1850 };
1851
1852 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1853 {
1854 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1855 }
1856
1857 /*
1858 * This structure is stuffed into the struct file's private_data field
1859 * for directories. It is where we put information so that we can do
1860 * readdir operations in hash tree order.
1861 */
1862 struct dir_private_info {
1863 struct rb_root root;
1864 struct rb_node *curr_node;
1865 struct fname *extra_fname;
1866 loff_t last_pos;
1867 __u32 curr_hash;
1868 __u32 curr_minor_hash;
1869 __u32 next_hash;
1870 };
1871
1872 /* calculate the first block number of the group */
1873 static inline ext4_fsblk_t
1874 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1875 {
1876 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1877 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1878 }
1879
1880 /*
1881 * Special error return code only used by dx_probe() and its callers.
1882 */
1883 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
1884
1885 /*
1886 * Timeout and state flag for lazy initialization inode thread.
1887 */
1888 #define EXT4_DEF_LI_WAIT_MULT 10
1889 #define EXT4_DEF_LI_MAX_START_DELAY 5
1890 #define EXT4_LAZYINIT_QUIT 0x0001
1891 #define EXT4_LAZYINIT_RUNNING 0x0002
1892
1893 /*
1894 * Lazy inode table initialization info
1895 */
1896 struct ext4_lazy_init {
1897 unsigned long li_state;
1898 struct list_head li_request_list;
1899 struct mutex li_list_mtx;
1900 };
1901
1902 struct ext4_li_request {
1903 struct super_block *lr_super;
1904 struct ext4_sb_info *lr_sbi;
1905 ext4_group_t lr_next_group;
1906 struct list_head lr_request;
1907 unsigned long lr_next_sched;
1908 unsigned long lr_timeout;
1909 };
1910
1911 struct ext4_features {
1912 struct kobject f_kobj;
1913 struct completion f_kobj_unregister;
1914 };
1915
1916 /*
1917 * This structure will be used for multiple mount protection. It will be
1918 * written into the block number saved in the s_mmp_block field in the
1919 * superblock. Programs that check MMP should assume that if
1920 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1921 * to use the filesystem, regardless of how old the timestamp is.
1922 */
1923 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1924 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1925 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1926 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1927
1928 struct mmp_struct {
1929 __le32 mmp_magic; /* Magic number for MMP */
1930 __le32 mmp_seq; /* Sequence no. updated periodically */
1931
1932 /*
1933 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1934 * purposes and do not affect the correctness of the algorithm
1935 */
1936 __le64 mmp_time; /* Time last updated */
1937 char mmp_nodename[64]; /* Node which last updated MMP block */
1938 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1939
1940 /*
1941 * mmp_check_interval is used to verify if the MMP block has been
1942 * updated on the block device. The value is updated based on the
1943 * maximum time to write the MMP block during an update cycle.
1944 */
1945 __le16 mmp_check_interval;
1946
1947 __le16 mmp_pad1;
1948 __le32 mmp_pad2[226];
1949 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1950 };
1951
1952 /* arguments passed to the mmp thread */
1953 struct mmpd_data {
1954 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1955 struct super_block *sb; /* super block of the fs */
1956 };
1957
1958 /*
1959 * Check interval multiplier
1960 * The MMP block is written every update interval and initially checked every
1961 * update interval x the multiplier (the value is then adapted based on the
1962 * write latency). The reason is that writes can be delayed under load and we
1963 * don't want readers to incorrectly assume that the filesystem is no longer
1964 * in use.
1965 */
1966 #define EXT4_MMP_CHECK_MULT 2UL
1967
1968 /*
1969 * Minimum interval for MMP checking in seconds.
1970 */
1971 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1972
1973 /*
1974 * Maximum interval for MMP checking in seconds.
1975 */
1976 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1977
1978 /*
1979 * Function prototypes
1980 */
1981
1982 /*
1983 * Ok, these declarations are also in <linux/kernel.h> but none of the
1984 * ext4 source programs needs to include it so they are duplicated here.
1985 */
1986 # define NORET_TYPE /**/
1987 # define ATTRIB_NORET __attribute__((noreturn))
1988 # define NORET_AND noreturn,
1989
1990 /* bitmap.c */
1991 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1992 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1993 struct ext4_group_desc *gdp,
1994 struct buffer_head *bh, int sz);
1995 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1996 struct ext4_group_desc *gdp,
1997 struct buffer_head *bh, int sz);
1998 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1999 struct ext4_group_desc *gdp,
2000 struct buffer_head *bh);
2001 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2002 struct ext4_group_desc *gdp,
2003 struct buffer_head *bh);
2004
2005 /* balloc.c */
2006 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2007 ext4_fsblk_t blocknr,
2008 ext4_group_t *blockgrpp,
2009 ext4_grpblk_t *offsetp);
2010 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2011 ext4_fsblk_t block);
2012
2013 extern unsigned int ext4_block_group(struct super_block *sb,
2014 ext4_fsblk_t blocknr);
2015 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2016 ext4_fsblk_t blocknr);
2017 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2018 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2019 ext4_group_t group);
2020 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2021 ext4_fsblk_t goal,
2022 unsigned int flags,
2023 unsigned long *count,
2024 int *errp);
2025 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2026 s64 nclusters, unsigned int flags);
2027 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2028 extern void ext4_check_blocks_bitmap(struct super_block *);
2029 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2030 ext4_group_t block_group,
2031 struct buffer_head ** bh);
2032 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2033
2034 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2035 ext4_group_t block_group);
2036 extern int ext4_wait_block_bitmap(struct super_block *sb,
2037 ext4_group_t block_group,
2038 struct buffer_head *bh);
2039 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2040 ext4_group_t block_group);
2041 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2042 ext4_group_t block_group,
2043 struct ext4_group_desc *gdp);
2044 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2045
2046 /* crypto_policy.c */
2047 int ext4_is_child_context_consistent_with_parent(struct inode *parent,
2048 struct inode *child);
2049 int ext4_inherit_context(struct inode *parent, struct inode *child);
2050 void ext4_to_hex(char *dst, char *src, size_t src_size);
2051 int ext4_process_policy(const struct ext4_encryption_policy *policy,
2052 struct inode *inode);
2053 int ext4_get_policy(struct inode *inode,
2054 struct ext4_encryption_policy *policy);
2055
2056 /* crypto.c */
2057 bool ext4_valid_contents_enc_mode(uint32_t mode);
2058 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2059 extern struct workqueue_struct *ext4_read_workqueue;
2060 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2061 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2062 void ext4_restore_control_page(struct page *data_page);
2063 struct page *ext4_encrypt(struct inode *inode,
2064 struct page *plaintext_page);
2065 int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page);
2066 int ext4_decrypt_one(struct inode *inode, struct page *page);
2067 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex);
2068
2069 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2070 int ext4_init_crypto(void);
2071 void ext4_exit_crypto(void);
2072 static inline int ext4_sb_has_crypto(struct super_block *sb)
2073 {
2074 return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
2075 }
2076 #else
2077 static inline int ext4_init_crypto(void) { return 0; }
2078 static inline void ext4_exit_crypto(void) { }
2079 static inline int ext4_sb_has_crypto(struct super_block *sb)
2080 {
2081 return 0;
2082 }
2083 #endif
2084
2085 /* crypto_fname.c */
2086 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2087 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2088 int ext4_fname_crypto_alloc_buffer(struct ext4_fname_crypto_ctx *ctx,
2089 u32 ilen, struct ext4_str *crypto_str);
2090 int _ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
2091 struct dx_hash_info *hinfo,
2092 const struct ext4_str *iname,
2093 struct ext4_str *oname);
2094 int ext4_fname_disk_to_usr(struct ext4_fname_crypto_ctx *ctx,
2095 struct dx_hash_info *hinfo,
2096 const struct ext4_dir_entry_2 *de,
2097 struct ext4_str *oname);
2098 int ext4_fname_usr_to_disk(struct ext4_fname_crypto_ctx *ctx,
2099 const struct qstr *iname,
2100 struct ext4_str *oname);
2101 int ext4_fname_usr_to_hash(struct ext4_fname_crypto_ctx *ctx,
2102 const struct qstr *iname,
2103 struct dx_hash_info *hinfo);
2104 int ext4_fname_crypto_namelen_on_disk(struct ext4_fname_crypto_ctx *ctx,
2105 u32 namelen);
2106 int ext4_fname_match(struct ext4_fname_crypto_ctx *ctx, struct ext4_str *cstr,
2107 int len, const char * const name,
2108 struct ext4_dir_entry_2 *de);
2109
2110
2111 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2112 void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx);
2113 struct ext4_fname_crypto_ctx *ext4_get_fname_crypto_ctx(struct inode *inode,
2114 u32 max_len);
2115 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2116 #else
2117 static inline
2118 void ext4_put_fname_crypto_ctx(struct ext4_fname_crypto_ctx **ctx) { }
2119 static inline
2120 struct ext4_fname_crypto_ctx *ext4_get_fname_crypto_ctx(struct inode *inode,
2121 u32 max_len)
2122 {
2123 return NULL;
2124 }
2125 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2126 #endif
2127
2128
2129 /* crypto_key.c */
2130 int ext4_generate_encryption_key(struct inode *inode);
2131
2132 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2133 int ext4_has_encryption_key(struct inode *inode);
2134 #else
2135 static inline int ext4_has_encryption_key(struct inode *inode)
2136 {
2137 return 0;
2138 }
2139 #endif
2140
2141
2142 /* dir.c */
2143 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2144 struct file *,
2145 struct ext4_dir_entry_2 *,
2146 struct buffer_head *, char *, int,
2147 unsigned int);
2148 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2149 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2150 (de), (bh), (buf), (size), (offset)))
2151 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2152 __u32 minor_hash,
2153 struct ext4_dir_entry_2 *dirent,
2154 struct ext4_str *ent_name);
2155 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2156 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2157 struct buffer_head *bh,
2158 void *buf, int buf_size,
2159 const char *name, int namelen,
2160 struct ext4_dir_entry_2 **dest_de);
2161 int ext4_insert_dentry(struct inode *dir,
2162 struct inode *inode,
2163 struct ext4_dir_entry_2 *de,
2164 int buf_size,
2165 const struct qstr *iname,
2166 const char *name, int namelen);
2167 static inline void ext4_update_dx_flag(struct inode *inode)
2168 {
2169 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2170 EXT4_FEATURE_COMPAT_DIR_INDEX))
2171 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2172 }
2173 static unsigned char ext4_filetype_table[] = {
2174 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2175 };
2176
2177 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2178 {
2179 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2180 (filetype >= EXT4_FT_MAX))
2181 return DT_UNKNOWN;
2182
2183 return ext4_filetype_table[filetype];
2184 }
2185 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2186 void *buf, int buf_size);
2187
2188 /* fsync.c */
2189 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2190
2191 /* hash.c */
2192 extern int ext4fs_dirhash(const char *name, int len, struct
2193 dx_hash_info *hinfo);
2194
2195 /* ialloc.c */
2196 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2197 const struct qstr *qstr, __u32 goal,
2198 uid_t *owner, int handle_type,
2199 unsigned int line_no, int nblocks);
2200
2201 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2202 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2203 0, 0, 0)
2204 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2205 type, nblocks) \
2206 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2207 (type), __LINE__, (nblocks))
2208
2209
2210 extern void ext4_free_inode(handle_t *, struct inode *);
2211 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2212 extern unsigned long ext4_count_free_inodes(struct super_block *);
2213 extern unsigned long ext4_count_dirs(struct super_block *);
2214 extern void ext4_check_inodes_bitmap(struct super_block *);
2215 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2216 extern int ext4_init_inode_table(struct super_block *sb,
2217 ext4_group_t group, int barrier);
2218 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2219
2220 /* mballoc.c */
2221 extern long ext4_mb_stats;
2222 extern long ext4_mb_max_to_scan;
2223 extern int ext4_mb_init(struct super_block *);
2224 extern int ext4_mb_release(struct super_block *);
2225 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2226 struct ext4_allocation_request *, int *);
2227 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2228 extern void ext4_discard_preallocations(struct inode *);
2229 extern int __init ext4_init_mballoc(void);
2230 extern void ext4_exit_mballoc(void);
2231 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2232 struct buffer_head *bh, ext4_fsblk_t block,
2233 unsigned long count, int flags);
2234 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2235 ext4_group_t ngroups);
2236 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2237 ext4_group_t i, struct ext4_group_desc *desc);
2238 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2239 ext4_fsblk_t block, unsigned long count);
2240 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2241
2242 /* inode.c */
2243 int ext4_inode_is_fast_symlink(struct inode *inode);
2244 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2245 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2246 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2247 struct buffer_head *bh_result, int create);
2248 int ext4_get_block(struct inode *inode, sector_t iblock,
2249 struct buffer_head *bh_result, int create);
2250 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2251 struct buffer_head *bh, int create);
2252 int ext4_walk_page_buffers(handle_t *handle,
2253 struct buffer_head *head,
2254 unsigned from,
2255 unsigned to,
2256 int *partial,
2257 int (*fn)(handle_t *handle,
2258 struct buffer_head *bh));
2259 int do_journal_get_write_access(handle_t *handle,
2260 struct buffer_head *bh);
2261 #define FALL_BACK_TO_NONDELALLOC 1
2262 #define CONVERT_INLINE_DATA 2
2263
2264 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2265 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2266 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2267 extern int ext4_setattr(struct dentry *, struct iattr *);
2268 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2269 struct kstat *stat);
2270 extern void ext4_evict_inode(struct inode *);
2271 extern void ext4_clear_inode(struct inode *);
2272 extern int ext4_sync_inode(handle_t *, struct inode *);
2273 extern void ext4_dirty_inode(struct inode *, int);
2274 extern int ext4_change_inode_journal_flag(struct inode *, int);
2275 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2276 extern int ext4_inode_attach_jinode(struct inode *inode);
2277 extern int ext4_can_truncate(struct inode *inode);
2278 extern void ext4_truncate(struct inode *);
2279 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2280 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2281 extern void ext4_set_inode_flags(struct inode *);
2282 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2283 extern int ext4_alloc_da_blocks(struct inode *inode);
2284 extern void ext4_set_aops(struct inode *inode);
2285 extern int ext4_writepage_trans_blocks(struct inode *);
2286 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2287 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2288 loff_t lstart, loff_t lend);
2289 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2290 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2291 extern void ext4_da_update_reserve_space(struct inode *inode,
2292 int used, int quota_claim);
2293
2294 /* indirect.c */
2295 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2296 struct ext4_map_blocks *map, int flags);
2297 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2298 loff_t offset);
2299 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2300 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2301 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2302 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2303 ext4_lblk_t start, ext4_lblk_t end);
2304
2305 /* ioctl.c */
2306 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2307 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2308
2309 /* migrate.c */
2310 extern int ext4_ext_migrate(struct inode *);
2311 extern int ext4_ind_migrate(struct inode *inode);
2312
2313 /* namei.c */
2314 extern int ext4_dirent_csum_verify(struct inode *inode,
2315 struct ext4_dir_entry *dirent);
2316 extern int ext4_orphan_add(handle_t *, struct inode *);
2317 extern int ext4_orphan_del(handle_t *, struct inode *);
2318 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2319 __u32 start_minor_hash, __u32 *next_hash);
2320 extern int search_dir(struct buffer_head *bh,
2321 char *search_buf,
2322 int buf_size,
2323 struct inode *dir,
2324 const struct qstr *d_name,
2325 unsigned int offset,
2326 struct ext4_dir_entry_2 **res_dir);
2327 extern int ext4_generic_delete_entry(handle_t *handle,
2328 struct inode *dir,
2329 struct ext4_dir_entry_2 *de_del,
2330 struct buffer_head *bh,
2331 void *entry_buf,
2332 int buf_size,
2333 int csum_size);
2334 extern int ext4_empty_dir(struct inode *inode);
2335
2336 /* resize.c */
2337 extern int ext4_group_add(struct super_block *sb,
2338 struct ext4_new_group_data *input);
2339 extern int ext4_group_extend(struct super_block *sb,
2340 struct ext4_super_block *es,
2341 ext4_fsblk_t n_blocks_count);
2342 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2343
2344 /* super.c */
2345 extern int ext4_calculate_overhead(struct super_block *sb);
2346 extern void ext4_superblock_csum_set(struct super_block *sb);
2347 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2348 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2349 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2350 ext4_group_t ngroup);
2351 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2352 char nbuf[16]);
2353
2354 extern __printf(4, 5)
2355 void __ext4_error(struct super_block *, const char *, unsigned int,
2356 const char *, ...);
2357 extern __printf(5, 6)
2358 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2359 const char *, ...);
2360 extern __printf(5, 6)
2361 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2362 const char *, ...);
2363 extern void __ext4_std_error(struct super_block *, const char *,
2364 unsigned int, int);
2365 extern __printf(4, 5)
2366 void __ext4_abort(struct super_block *, const char *, unsigned int,
2367 const char *, ...);
2368 extern __printf(4, 5)
2369 void __ext4_warning(struct super_block *, const char *, unsigned int,
2370 const char *, ...);
2371 extern __printf(3, 4)
2372 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2373 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2374 const char *, unsigned int, const char *);
2375 extern __printf(7, 8)
2376 void __ext4_grp_locked_error(const char *, unsigned int,
2377 struct super_block *, ext4_group_t,
2378 unsigned long, ext4_fsblk_t,
2379 const char *, ...);
2380
2381 #ifdef CONFIG_PRINTK
2382
2383 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2384 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2385 #define ext4_error_file(file, func, line, block, fmt, ...) \
2386 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2387 #define ext4_error(sb, fmt, ...) \
2388 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2389 #define ext4_abort(sb, fmt, ...) \
2390 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2391 #define ext4_warning(sb, fmt, ...) \
2392 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2393 #define ext4_msg(sb, level, fmt, ...) \
2394 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2395 #define dump_mmp_msg(sb, mmp, msg) \
2396 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2397 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2398 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2399 fmt, ##__VA_ARGS__)
2400
2401 #else
2402
2403 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2404 do { \
2405 no_printk(fmt, ##__VA_ARGS__); \
2406 __ext4_error_inode(inode, "", 0, block, " "); \
2407 } while (0)
2408 #define ext4_error_file(file, func, line, block, fmt, ...) \
2409 do { \
2410 no_printk(fmt, ##__VA_ARGS__); \
2411 __ext4_error_file(file, "", 0, block, " "); \
2412 } while (0)
2413 #define ext4_error(sb, fmt, ...) \
2414 do { \
2415 no_printk(fmt, ##__VA_ARGS__); \
2416 __ext4_error(sb, "", 0, " "); \
2417 } while (0)
2418 #define ext4_abort(sb, fmt, ...) \
2419 do { \
2420 no_printk(fmt, ##__VA_ARGS__); \
2421 __ext4_abort(sb, "", 0, " "); \
2422 } while (0)
2423 #define ext4_warning(sb, fmt, ...) \
2424 do { \
2425 no_printk(fmt, ##__VA_ARGS__); \
2426 __ext4_warning(sb, "", 0, " "); \
2427 } while (0)
2428 #define ext4_msg(sb, level, fmt, ...) \
2429 do { \
2430 no_printk(fmt, ##__VA_ARGS__); \
2431 __ext4_msg(sb, "", " "); \
2432 } while (0)
2433 #define dump_mmp_msg(sb, mmp, msg) \
2434 __dump_mmp_msg(sb, mmp, "", 0, "")
2435 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2436 do { \
2437 no_printk(fmt, ##__VA_ARGS__); \
2438 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2439 } while (0)
2440
2441 #endif
2442
2443 extern void ext4_update_dynamic_rev(struct super_block *sb);
2444 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2445 __u32 compat);
2446 extern int ext4_update_rocompat_feature(handle_t *handle,
2447 struct super_block *sb, __u32 rocompat);
2448 extern int ext4_update_incompat_feature(handle_t *handle,
2449 struct super_block *sb, __u32 incompat);
2450 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2451 struct ext4_group_desc *bg);
2452 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2453 struct ext4_group_desc *bg);
2454 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2455 struct ext4_group_desc *bg);
2456 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2457 struct ext4_group_desc *bg);
2458 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2459 struct ext4_group_desc *bg);
2460 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2461 struct ext4_group_desc *bg);
2462 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2463 struct ext4_group_desc *bg);
2464 extern void ext4_block_bitmap_set(struct super_block *sb,
2465 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2466 extern void ext4_inode_bitmap_set(struct super_block *sb,
2467 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2468 extern void ext4_inode_table_set(struct super_block *sb,
2469 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2470 extern void ext4_free_group_clusters_set(struct super_block *sb,
2471 struct ext4_group_desc *bg,
2472 __u32 count);
2473 extern void ext4_free_inodes_set(struct super_block *sb,
2474 struct ext4_group_desc *bg, __u32 count);
2475 extern void ext4_used_dirs_set(struct super_block *sb,
2476 struct ext4_group_desc *bg, __u32 count);
2477 extern void ext4_itable_unused_set(struct super_block *sb,
2478 struct ext4_group_desc *bg, __u32 count);
2479 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2480 struct ext4_group_desc *gdp);
2481 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2482 struct ext4_group_desc *gdp);
2483 extern int ext4_register_li_request(struct super_block *sb,
2484 ext4_group_t first_not_zeroed);
2485
2486 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2487 {
2488 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2489 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
2490 (EXT4_SB(sb)->s_chksum_driver != NULL);
2491 }
2492
2493 static inline int ext4_has_metadata_csum(struct super_block *sb)
2494 {
2495 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
2496 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
2497 !EXT4_SB(sb)->s_chksum_driver);
2498
2499 return (EXT4_SB(sb)->s_chksum_driver != NULL);
2500 }
2501 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2502 {
2503 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2504 le32_to_cpu(es->s_blocks_count_lo);
2505 }
2506
2507 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2508 {
2509 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2510 le32_to_cpu(es->s_r_blocks_count_lo);
2511 }
2512
2513 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2514 {
2515 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2516 le32_to_cpu(es->s_free_blocks_count_lo);
2517 }
2518
2519 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2520 ext4_fsblk_t blk)
2521 {
2522 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2523 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2524 }
2525
2526 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2527 ext4_fsblk_t blk)
2528 {
2529 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2530 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2531 }
2532
2533 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2534 ext4_fsblk_t blk)
2535 {
2536 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2537 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2538 }
2539
2540 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2541 {
2542 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2543 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2544 le32_to_cpu(raw_inode->i_size_lo);
2545 else
2546 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2547 }
2548
2549 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2550 {
2551 raw_inode->i_size_lo = cpu_to_le32(i_size);
2552 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2553 }
2554
2555 static inline
2556 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2557 ext4_group_t group)
2558 {
2559 struct ext4_group_info ***grp_info;
2560 long indexv, indexh;
2561 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2562 grp_info = EXT4_SB(sb)->s_group_info;
2563 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2564 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2565 return grp_info[indexv][indexh];
2566 }
2567
2568 /*
2569 * Reading s_groups_count requires using smp_rmb() afterwards. See
2570 * the locking protocol documented in the comments of ext4_group_add()
2571 * in resize.c
2572 */
2573 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2574 {
2575 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2576
2577 smp_rmb();
2578 return ngroups;
2579 }
2580
2581 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2582 ext4_group_t block_group)
2583 {
2584 return block_group >> sbi->s_log_groups_per_flex;
2585 }
2586
2587 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2588 {
2589 return 1 << sbi->s_log_groups_per_flex;
2590 }
2591
2592 #define ext4_std_error(sb, errno) \
2593 do { \
2594 if ((errno)) \
2595 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2596 } while (0)
2597
2598 #ifdef CONFIG_SMP
2599 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2600 * counters. So we need to make sure we have free clusters more
2601 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2602 */
2603 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2604 #else
2605 #define EXT4_FREECLUSTERS_WATERMARK 0
2606 #endif
2607
2608 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2609 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2610 {
2611 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2612 !mutex_is_locked(&inode->i_mutex));
2613 down_write(&EXT4_I(inode)->i_data_sem);
2614 if (newsize > EXT4_I(inode)->i_disksize)
2615 EXT4_I(inode)->i_disksize = newsize;
2616 up_write(&EXT4_I(inode)->i_data_sem);
2617 }
2618
2619 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2620 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2621 {
2622 int changed = 0;
2623
2624 if (newsize > inode->i_size) {
2625 i_size_write(inode, newsize);
2626 changed = 1;
2627 }
2628 if (newsize > EXT4_I(inode)->i_disksize) {
2629 ext4_update_i_disksize(inode, newsize);
2630 changed |= 2;
2631 }
2632 return changed;
2633 }
2634
2635 struct ext4_group_info {
2636 unsigned long bb_state;
2637 struct rb_root bb_free_root;
2638 ext4_grpblk_t bb_first_free; /* first free block */
2639 ext4_grpblk_t bb_free; /* total free blocks */
2640 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2641 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2642 struct list_head bb_prealloc_list;
2643 #ifdef DOUBLE_CHECK
2644 void *bb_bitmap;
2645 #endif
2646 struct rw_semaphore alloc_sem;
2647 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2648 * regions, index is order.
2649 * bb_counters[3] = 5 means
2650 * 5 free 8-block regions. */
2651 };
2652
2653 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2654 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2655 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2656 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2657
2658 #define EXT4_MB_GRP_NEED_INIT(grp) \
2659 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2660 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2661 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2662 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2663 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2664
2665 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2666 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2667 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2668 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2669 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2670 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2671
2672 #define EXT4_MAX_CONTENTION 8
2673 #define EXT4_CONTENTION_THRESHOLD 2
2674
2675 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2676 ext4_group_t group)
2677 {
2678 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2679 }
2680
2681 /*
2682 * Returns true if the filesystem is busy enough that attempts to
2683 * access the block group locks has run into contention.
2684 */
2685 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2686 {
2687 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2688 }
2689
2690 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2691 {
2692 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2693 if (spin_trylock(lock))
2694 /*
2695 * We're able to grab the lock right away, so drop the
2696 * lock contention counter.
2697 */
2698 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2699 else {
2700 /*
2701 * The lock is busy, so bump the contention counter,
2702 * and then wait on the spin lock.
2703 */
2704 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2705 EXT4_MAX_CONTENTION);
2706 spin_lock(lock);
2707 }
2708 }
2709
2710 static inline void ext4_unlock_group(struct super_block *sb,
2711 ext4_group_t group)
2712 {
2713 spin_unlock(ext4_group_lock_ptr(sb, group));
2714 }
2715
2716 /*
2717 * Block validity checking
2718 */
2719 #define ext4_check_indirect_blockref(inode, bh) \
2720 ext4_check_blockref(__func__, __LINE__, inode, \
2721 (__le32 *)(bh)->b_data, \
2722 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2723
2724 #define ext4_ind_check_inode(inode) \
2725 ext4_check_blockref(__func__, __LINE__, inode, \
2726 EXT4_I(inode)->i_data, \
2727 EXT4_NDIR_BLOCKS)
2728
2729 /*
2730 * Inodes and files operations
2731 */
2732
2733 /* dir.c */
2734 extern const struct file_operations ext4_dir_operations;
2735
2736 /* file.c */
2737 extern const struct inode_operations ext4_file_inode_operations;
2738 extern const struct file_operations ext4_file_operations;
2739 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2740
2741 /* inline.c */
2742 extern int ext4_get_max_inline_size(struct inode *inode);
2743 extern int ext4_find_inline_data_nolock(struct inode *inode);
2744 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2745 unsigned int len);
2746 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2747
2748 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2749 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2750 struct inode *inode,
2751 loff_t pos, unsigned len,
2752 unsigned flags,
2753 struct page **pagep);
2754 extern int ext4_write_inline_data_end(struct inode *inode,
2755 loff_t pos, unsigned len,
2756 unsigned copied,
2757 struct page *page);
2758 extern struct buffer_head *
2759 ext4_journalled_write_inline_data(struct inode *inode,
2760 unsigned len,
2761 struct page *page);
2762 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2763 struct inode *inode,
2764 loff_t pos, unsigned len,
2765 unsigned flags,
2766 struct page **pagep,
2767 void **fsdata);
2768 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2769 unsigned len, unsigned copied,
2770 struct page *page);
2771 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2772 struct inode *inode);
2773 extern int ext4_try_create_inline_dir(handle_t *handle,
2774 struct inode *parent,
2775 struct inode *inode);
2776 extern int ext4_read_inline_dir(struct file *filp,
2777 struct dir_context *ctx,
2778 int *has_inline_data);
2779 extern int htree_inlinedir_to_tree(struct file *dir_file,
2780 struct inode *dir, ext4_lblk_t block,
2781 struct dx_hash_info *hinfo,
2782 __u32 start_hash, __u32 start_minor_hash,
2783 int *has_inline_data);
2784 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2785 const struct qstr *d_name,
2786 struct ext4_dir_entry_2 **res_dir,
2787 int *has_inline_data);
2788 extern int ext4_delete_inline_entry(handle_t *handle,
2789 struct inode *dir,
2790 struct ext4_dir_entry_2 *de_del,
2791 struct buffer_head *bh,
2792 int *has_inline_data);
2793 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2794 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2795 struct ext4_dir_entry_2 **parent_de,
2796 int *retval);
2797 extern int ext4_inline_data_fiemap(struct inode *inode,
2798 struct fiemap_extent_info *fieinfo,
2799 int *has_inline, __u64 start, __u64 len);
2800 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2801 struct inode *inode,
2802 int needed);
2803 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2804
2805 extern int ext4_convert_inline_data(struct inode *inode);
2806
2807 static inline int ext4_has_inline_data(struct inode *inode)
2808 {
2809 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2810 EXT4_I(inode)->i_inline_off;
2811 }
2812
2813 /* namei.c */
2814 extern const struct inode_operations ext4_dir_inode_operations;
2815 extern const struct inode_operations ext4_special_inode_operations;
2816 extern struct dentry *ext4_get_parent(struct dentry *child);
2817 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2818 struct ext4_dir_entry_2 *de,
2819 int blocksize, int csum_size,
2820 unsigned int parent_ino, int dotdot_real_len);
2821 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2822 unsigned int blocksize);
2823 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2824 struct inode *inode,
2825 struct buffer_head *bh);
2826 #define S_SHIFT 12
2827 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2828 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2829 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2830 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2831 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2832 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2833 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2834 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2835 };
2836
2837 static inline void ext4_set_de_type(struct super_block *sb,
2838 struct ext4_dir_entry_2 *de,
2839 umode_t mode) {
2840 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2841 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2842 }
2843
2844 /* readpages.c */
2845 extern int ext4_mpage_readpages(struct address_space *mapping,
2846 struct list_head *pages, struct page *page,
2847 unsigned nr_pages);
2848
2849 /* symlink.c */
2850 extern const struct inode_operations ext4_symlink_inode_operations;
2851 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2852
2853 /* block_validity */
2854 extern void ext4_release_system_zone(struct super_block *sb);
2855 extern int ext4_setup_system_zone(struct super_block *sb);
2856 extern int __init ext4_init_system_zone(void);
2857 extern void ext4_exit_system_zone(void);
2858 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2859 ext4_fsblk_t start_blk,
2860 unsigned int count);
2861 extern int ext4_check_blockref(const char *, unsigned int,
2862 struct inode *, __le32 *, unsigned int);
2863
2864 /* extents.c */
2865 struct ext4_ext_path;
2866 struct ext4_extent;
2867
2868 /*
2869 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2870 * __le32.
2871 */
2872 #define EXT_MAX_BLOCKS 0xffffffff
2873
2874 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2875 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2876 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2877 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2878 struct ext4_map_blocks *map, int flags);
2879 extern void ext4_ext_truncate(handle_t *, struct inode *);
2880 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2881 ext4_lblk_t end);
2882 extern void ext4_ext_init(struct super_block *);
2883 extern void ext4_ext_release(struct super_block *);
2884 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2885 loff_t len);
2886 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2887 loff_t offset, ssize_t len);
2888 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2889 struct ext4_map_blocks *map, int flags);
2890 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2891 ext4_lblk_t lblocks);
2892 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2893 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2894 int num,
2895 struct ext4_ext_path *path);
2896 extern int ext4_can_extents_be_merged(struct inode *inode,
2897 struct ext4_extent *ex1,
2898 struct ext4_extent *ex2);
2899 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2900 struct ext4_ext_path **,
2901 struct ext4_extent *, int);
2902 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
2903 struct ext4_ext_path **,
2904 int flags);
2905 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2906 extern int ext4_ext_check_inode(struct inode *inode);
2907 extern int ext4_find_delalloc_range(struct inode *inode,
2908 ext4_lblk_t lblk_start,
2909 ext4_lblk_t lblk_end);
2910 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2911 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
2912 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2913 __u64 start, __u64 len);
2914 extern int ext4_ext_precache(struct inode *inode);
2915 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2916 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
2917 struct inode *inode2, ext4_lblk_t lblk1,
2918 ext4_lblk_t lblk2, ext4_lblk_t count,
2919 int mark_unwritten,int *err);
2920
2921 /* move_extent.c */
2922 extern void ext4_double_down_write_data_sem(struct inode *first,
2923 struct inode *second);
2924 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2925 struct inode *donor_inode);
2926 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2927 __u64 start_orig, __u64 start_donor,
2928 __u64 len, __u64 *moved_len);
2929
2930 /* page-io.c */
2931 extern int __init ext4_init_pageio(void);
2932 extern void ext4_exit_pageio(void);
2933 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2934 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2935 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2936 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2937 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2938 struct writeback_control *wbc);
2939 extern void ext4_end_io_rsv_work(struct work_struct *work);
2940 extern void ext4_io_submit(struct ext4_io_submit *io);
2941 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2942 struct page *page,
2943 int len,
2944 struct writeback_control *wbc,
2945 bool keep_towrite);
2946
2947 /* mmp.c */
2948 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2949
2950 /*
2951 * Add new method to test whether block and inode bitmaps are properly
2952 * initialized. With uninit_bg reading the block from disk is not enough
2953 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2954 */
2955 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2956
2957 static inline int bitmap_uptodate(struct buffer_head *bh)
2958 {
2959 return (buffer_uptodate(bh) &&
2960 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2961 }
2962 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2963 {
2964 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2965 }
2966
2967 /*
2968 * Disable DIO read nolock optimization, so new dioreaders will be forced
2969 * to grab i_mutex
2970 */
2971 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2972 {
2973 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2974 smp_mb();
2975 }
2976 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2977 {
2978 smp_mb();
2979 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2980 }
2981
2982 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2983
2984 /* For ioend & aio unwritten conversion wait queues */
2985 #define EXT4_WQ_HASH_SZ 37
2986 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2987 EXT4_WQ_HASH_SZ])
2988 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2989 EXT4_WQ_HASH_SZ])
2990 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2991 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2992
2993 #define EXT4_RESIZING 0
2994 extern int ext4_resize_begin(struct super_block *sb);
2995 extern void ext4_resize_end(struct super_block *sb);
2996
2997 #endif /* __KERNEL__ */
2998
2999 #endif /* _EXT4_H */
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