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Merge tag 'cpuinit-v4.1-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/paulg...
[deliverable/linux.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 /* data type for block offset of block group */
73 typedef int ext4_grpblk_t;
74
75 /* data type for filesystem-wide blocks number */
76 typedef unsigned long long ext4_fsblk_t;
77
78 /* data type for file logical block number */
79 typedef __u32 ext4_lblk_t;
80
81 /* data type for block group number */
82 typedef unsigned int ext4_group_t;
83
84 enum SHIFT_DIRECTION {
85 SHIFT_LEFT = 0,
86 SHIFT_RIGHT,
87 };
88
89 /*
90 * Flags used in mballoc's allocation_context flags field.
91 *
92 * Also used to show what's going on for debugging purposes when the
93 * flag field is exported via the traceport interface
94 */
95
96 /* prefer goal again. length */
97 #define EXT4_MB_HINT_MERGE 0x0001
98 /* blocks already reserved */
99 #define EXT4_MB_HINT_RESERVED 0x0002
100 /* metadata is being allocated */
101 #define EXT4_MB_HINT_METADATA 0x0004
102 /* first blocks in the file */
103 #define EXT4_MB_HINT_FIRST 0x0008
104 /* search for the best chunk */
105 #define EXT4_MB_HINT_BEST 0x0010
106 /* data is being allocated */
107 #define EXT4_MB_HINT_DATA 0x0020
108 /* don't preallocate (for tails) */
109 #define EXT4_MB_HINT_NOPREALLOC 0x0040
110 /* allocate for locality group */
111 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
112 /* allocate goal blocks or none */
113 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
114 /* goal is meaningful */
115 #define EXT4_MB_HINT_TRY_GOAL 0x0200
116 /* blocks already pre-reserved by delayed allocation */
117 #define EXT4_MB_DELALLOC_RESERVED 0x0400
118 /* We are doing stream allocation */
119 #define EXT4_MB_STREAM_ALLOC 0x0800
120 /* Use reserved root blocks if needed */
121 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
122 /* Use blocks from reserved pool */
123 #define EXT4_MB_USE_RESERVED 0x2000
124
125 struct ext4_allocation_request {
126 /* target inode for block we're allocating */
127 struct inode *inode;
128 /* how many blocks we want to allocate */
129 unsigned int len;
130 /* logical block in target inode */
131 ext4_lblk_t logical;
132 /* the closest logical allocated block to the left */
133 ext4_lblk_t lleft;
134 /* the closest logical allocated block to the right */
135 ext4_lblk_t lright;
136 /* phys. target (a hint) */
137 ext4_fsblk_t goal;
138 /* phys. block for the closest logical allocated block to the left */
139 ext4_fsblk_t pleft;
140 /* phys. block for the closest logical allocated block to the right */
141 ext4_fsblk_t pright;
142 /* flags. see above EXT4_MB_HINT_* */
143 unsigned int flags;
144 };
145
146 /*
147 * Logical to physical block mapping, used by ext4_map_blocks()
148 *
149 * This structure is used to pass requests into ext4_map_blocks() as
150 * well as to store the information returned by ext4_map_blocks(). It
151 * takes less room on the stack than a struct buffer_head.
152 */
153 #define EXT4_MAP_NEW (1 << BH_New)
154 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
157 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
158 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
159
160 struct ext4_map_blocks {
161 ext4_fsblk_t m_pblk;
162 ext4_lblk_t m_lblk;
163 unsigned int m_len;
164 unsigned int m_flags;
165 };
166
167 /*
168 * Flags for ext4_io_end->flags
169 */
170 #define EXT4_IO_END_UNWRITTEN 0x0001
171
172 /*
173 * For converting unwritten extents on a work queue. 'handle' is used for
174 * buffered writeback.
175 */
176 typedef struct ext4_io_end {
177 struct list_head list; /* per-file finished IO list */
178 handle_t *handle; /* handle reserved for extent
179 * conversion */
180 struct inode *inode; /* file being written to */
181 struct bio *bio; /* Linked list of completed
182 * bios covering the extent */
183 unsigned int flag; /* unwritten or not */
184 loff_t offset; /* offset in the file */
185 ssize_t size; /* size of the extent */
186 atomic_t count; /* reference counter */
187 } ext4_io_end_t;
188
189 struct ext4_io_submit {
190 int io_op;
191 struct bio *io_bio;
192 ext4_io_end_t *io_end;
193 sector_t io_next_block;
194 };
195
196 /*
197 * Special inodes numbers
198 */
199 #define EXT4_BAD_INO 1 /* Bad blocks inode */
200 #define EXT4_ROOT_INO 2 /* Root inode */
201 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
202 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
203 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
204 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
205 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
206 #define EXT4_JOURNAL_INO 8 /* Journal inode */
207
208 /* First non-reserved inode for old ext4 filesystems */
209 #define EXT4_GOOD_OLD_FIRST_INO 11
210
211 /*
212 * Maximal count of links to a file
213 */
214 #define EXT4_LINK_MAX 65000
215
216 /*
217 * Macro-instructions used to manage several block sizes
218 */
219 #define EXT4_MIN_BLOCK_SIZE 1024
220 #define EXT4_MAX_BLOCK_SIZE 65536
221 #define EXT4_MIN_BLOCK_LOG_SIZE 10
222 #define EXT4_MAX_BLOCK_LOG_SIZE 16
223 #ifdef __KERNEL__
224 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
225 #else
226 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
227 #endif
228 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
229 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
230 EXT4_SB(s)->s_cluster_bits)
231 #ifdef __KERNEL__
232 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
233 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
234 #else
235 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
236 #endif
237 #ifdef __KERNEL__
238 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
239 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
240 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
241 #else
242 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
243 EXT4_GOOD_OLD_INODE_SIZE : \
244 (s)->s_inode_size)
245 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
246 EXT4_GOOD_OLD_FIRST_INO : \
247 (s)->s_first_ino)
248 #endif
249 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
250
251 /* Translate a block number to a cluster number */
252 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
253 /* Translate a cluster number to a block number */
254 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
255 /* Translate # of blks to # of clusters */
256 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
257 (sbi)->s_cluster_bits)
258 /* Mask out the low bits to get the starting block of the cluster */
259 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
260 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
261 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
262 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
263 /* Get the cluster offset */
264 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
265 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
266 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
267 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
268
269 /*
270 * Structure of a blocks group descriptor
271 */
272 struct ext4_group_desc
273 {
274 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
275 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
276 __le32 bg_inode_table_lo; /* Inodes table block */
277 __le16 bg_free_blocks_count_lo;/* Free blocks count */
278 __le16 bg_free_inodes_count_lo;/* Free inodes count */
279 __le16 bg_used_dirs_count_lo; /* Directories count */
280 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
281 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
282 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
283 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
284 __le16 bg_itable_unused_lo; /* Unused inodes count */
285 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
286 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
287 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
288 __le32 bg_inode_table_hi; /* Inodes table block MSB */
289 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
290 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
291 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
292 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
293 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
294 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
295 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
296 __u32 bg_reserved;
297 };
298
299 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
300 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
301 sizeof(__le16))
302 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
303 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
304 sizeof(__le16))
305
306 /*
307 * Structure of a flex block group info
308 */
309
310 struct flex_groups {
311 atomic64_t free_clusters;
312 atomic_t free_inodes;
313 atomic_t used_dirs;
314 };
315
316 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
317 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
318 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
319
320 /*
321 * Macro-instructions used to manage group descriptors
322 */
323 #define EXT4_MIN_DESC_SIZE 32
324 #define EXT4_MIN_DESC_SIZE_64BIT 64
325 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
326 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
327 #ifdef __KERNEL__
328 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
329 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
330 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
331 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
332 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
333 #else
334 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
335 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
336 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
337 #endif
338
339 /*
340 * Constants relative to the data blocks
341 */
342 #define EXT4_NDIR_BLOCKS 12
343 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
344 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
345 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
346 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
347
348 /*
349 * Inode flags
350 */
351 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
352 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
353 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
354 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
355 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
356 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
357 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
358 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
359 /* Reserved for compression usage... */
360 #define EXT4_DIRTY_FL 0x00000100
361 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
362 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
363 /* nb: was previously EXT2_ECOMPR_FL */
364 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
365 /* End compression flags --- maybe not all used */
366 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
367 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
368 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
369 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
370 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
371 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
372 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
373 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
374 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
375 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
376 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
377 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
378
379 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
380 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
381
382 /* Flags that should be inherited by new inodes from their parent. */
383 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
384 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
385 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
386 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
387
388 /* Flags that are appropriate for regular files (all but dir-specific ones). */
389 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
390
391 /* Flags that are appropriate for non-directories/regular files. */
392 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
393
394 /* Mask out flags that are inappropriate for the given type of inode. */
395 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
396 {
397 if (S_ISDIR(mode))
398 return flags;
399 else if (S_ISREG(mode))
400 return flags & EXT4_REG_FLMASK;
401 else
402 return flags & EXT4_OTHER_FLMASK;
403 }
404
405 /*
406 * Inode flags used for atomic set/get
407 */
408 enum {
409 EXT4_INODE_SECRM = 0, /* Secure deletion */
410 EXT4_INODE_UNRM = 1, /* Undelete */
411 EXT4_INODE_COMPR = 2, /* Compress file */
412 EXT4_INODE_SYNC = 3, /* Synchronous updates */
413 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
414 EXT4_INODE_APPEND = 5, /* writes to file may only append */
415 EXT4_INODE_NODUMP = 6, /* do not dump file */
416 EXT4_INODE_NOATIME = 7, /* do not update atime */
417 /* Reserved for compression usage... */
418 EXT4_INODE_DIRTY = 8,
419 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
420 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
421 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
422 /* End compression flags --- maybe not all used */
423 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
424 EXT4_INODE_IMAGIC = 13, /* AFS directory */
425 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
426 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
427 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
428 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
429 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
430 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
431 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
432 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
433 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
434 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
435 };
436
437 /*
438 * Since it's pretty easy to mix up bit numbers and hex values, we use a
439 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
440 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
441 * any extra space in the compiled kernel image, otherwise, the build will fail.
442 * It's important that these values are the same, since we are using
443 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
444 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
445 * values found in ext2, ext3 and ext4 filesystems, and of course the values
446 * defined in e2fsprogs.
447 *
448 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
449 */
450 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
451 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
452
453 static inline void ext4_check_flag_values(void)
454 {
455 CHECK_FLAG_VALUE(SECRM);
456 CHECK_FLAG_VALUE(UNRM);
457 CHECK_FLAG_VALUE(COMPR);
458 CHECK_FLAG_VALUE(SYNC);
459 CHECK_FLAG_VALUE(IMMUTABLE);
460 CHECK_FLAG_VALUE(APPEND);
461 CHECK_FLAG_VALUE(NODUMP);
462 CHECK_FLAG_VALUE(NOATIME);
463 CHECK_FLAG_VALUE(DIRTY);
464 CHECK_FLAG_VALUE(COMPRBLK);
465 CHECK_FLAG_VALUE(NOCOMPR);
466 CHECK_FLAG_VALUE(ENCRYPT);
467 CHECK_FLAG_VALUE(INDEX);
468 CHECK_FLAG_VALUE(IMAGIC);
469 CHECK_FLAG_VALUE(JOURNAL_DATA);
470 CHECK_FLAG_VALUE(NOTAIL);
471 CHECK_FLAG_VALUE(DIRSYNC);
472 CHECK_FLAG_VALUE(TOPDIR);
473 CHECK_FLAG_VALUE(HUGE_FILE);
474 CHECK_FLAG_VALUE(EXTENTS);
475 CHECK_FLAG_VALUE(EA_INODE);
476 CHECK_FLAG_VALUE(EOFBLOCKS);
477 CHECK_FLAG_VALUE(INLINE_DATA);
478 CHECK_FLAG_VALUE(RESERVED);
479 }
480
481 /* Used to pass group descriptor data when online resize is done */
482 struct ext4_new_group_input {
483 __u32 group; /* Group number for this data */
484 __u64 block_bitmap; /* Absolute block number of block bitmap */
485 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
486 __u64 inode_table; /* Absolute block number of inode table start */
487 __u32 blocks_count; /* Total number of blocks in this group */
488 __u16 reserved_blocks; /* Number of reserved blocks in this group */
489 __u16 unused;
490 };
491
492 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
493 struct compat_ext4_new_group_input {
494 u32 group;
495 compat_u64 block_bitmap;
496 compat_u64 inode_bitmap;
497 compat_u64 inode_table;
498 u32 blocks_count;
499 u16 reserved_blocks;
500 u16 unused;
501 };
502 #endif
503
504 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
505 struct ext4_new_group_data {
506 __u32 group;
507 __u64 block_bitmap;
508 __u64 inode_bitmap;
509 __u64 inode_table;
510 __u32 blocks_count;
511 __u16 reserved_blocks;
512 __u16 unused;
513 __u32 free_blocks_count;
514 };
515
516 /* Indexes used to index group tables in ext4_new_group_data */
517 enum {
518 BLOCK_BITMAP = 0, /* block bitmap */
519 INODE_BITMAP, /* inode bitmap */
520 INODE_TABLE, /* inode tables */
521 GROUP_TABLE_COUNT,
522 };
523
524 /*
525 * Flags used by ext4_map_blocks()
526 */
527 /* Allocate any needed blocks and/or convert an unwritten
528 extent to be an initialized ext4 */
529 #define EXT4_GET_BLOCKS_CREATE 0x0001
530 /* Request the creation of an unwritten extent */
531 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
532 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
533 EXT4_GET_BLOCKS_CREATE)
534 /* Caller is from the delayed allocation writeout path
535 * finally doing the actual allocation of delayed blocks */
536 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
537 /* caller is from the direct IO path, request to creation of an
538 unwritten extents if not allocated, split the unwritten
539 extent if blocks has been preallocated already*/
540 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
541 #define EXT4_GET_BLOCKS_CONVERT 0x0010
542 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
543 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
544 /* Convert extent to initialized after IO complete */
545 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
547 /* Eventual metadata allocation (due to growing extent tree)
548 * should not fail, so try to use reserved blocks for that.*/
549 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
550 /* Don't normalize allocation size (used for fallocate) */
551 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
552 /* Request will not result in inode size update (user for fallocate) */
553 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
554 /* Do not take i_data_sem locking in ext4_map_blocks */
555 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
556 /* Convert written extents to unwritten */
557 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
558
559 /*
560 * The bit position of these flags must not overlap with any of the
561 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
562 * read_extent_tree_block(), ext4_split_extent_at(),
563 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
564 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
565 * caching the extents when reading from the extent tree while a
566 * truncate or punch hole operation is in progress.
567 */
568 #define EXT4_EX_NOCACHE 0x40000000
569 #define EXT4_EX_FORCE_CACHE 0x20000000
570
571 /*
572 * Flags used by ext4_free_blocks
573 */
574 #define EXT4_FREE_BLOCKS_METADATA 0x0001
575 #define EXT4_FREE_BLOCKS_FORGET 0x0002
576 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
577 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
578 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
579 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
580
581 /* Encryption algorithms */
582 #define EXT4_ENCRYPTION_MODE_INVALID 0
583 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
584 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
585 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
586 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
587
588 #include "ext4_crypto.h"
589
590 /*
591 * ioctl commands
592 */
593 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
594 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
595 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
596 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
597 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
598 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
599 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
600 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
601 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
602 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
603 #define EXT4_IOC_MIGRATE _IO('f', 9)
604 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
605 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
606 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
607 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
608 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
609 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
610 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
611 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy)
612 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
613 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)
614
615 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
616 /*
617 * ioctl commands in 32 bit emulation
618 */
619 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
620 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
621 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
622 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
623 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
624 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
625 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
626 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
627 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
628 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
629 #endif
630
631 /* Max physical block we can address w/o extents */
632 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
633
634 /*
635 * Structure of an inode on the disk
636 */
637 struct ext4_inode {
638 __le16 i_mode; /* File mode */
639 __le16 i_uid; /* Low 16 bits of Owner Uid */
640 __le32 i_size_lo; /* Size in bytes */
641 __le32 i_atime; /* Access time */
642 __le32 i_ctime; /* Inode Change time */
643 __le32 i_mtime; /* Modification time */
644 __le32 i_dtime; /* Deletion Time */
645 __le16 i_gid; /* Low 16 bits of Group Id */
646 __le16 i_links_count; /* Links count */
647 __le32 i_blocks_lo; /* Blocks count */
648 __le32 i_flags; /* File flags */
649 union {
650 struct {
651 __le32 l_i_version;
652 } linux1;
653 struct {
654 __u32 h_i_translator;
655 } hurd1;
656 struct {
657 __u32 m_i_reserved1;
658 } masix1;
659 } osd1; /* OS dependent 1 */
660 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
661 __le32 i_generation; /* File version (for NFS) */
662 __le32 i_file_acl_lo; /* File ACL */
663 __le32 i_size_high;
664 __le32 i_obso_faddr; /* Obsoleted fragment address */
665 union {
666 struct {
667 __le16 l_i_blocks_high; /* were l_i_reserved1 */
668 __le16 l_i_file_acl_high;
669 __le16 l_i_uid_high; /* these 2 fields */
670 __le16 l_i_gid_high; /* were reserved2[0] */
671 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
672 __le16 l_i_reserved;
673 } linux2;
674 struct {
675 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
676 __u16 h_i_mode_high;
677 __u16 h_i_uid_high;
678 __u16 h_i_gid_high;
679 __u32 h_i_author;
680 } hurd2;
681 struct {
682 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
683 __le16 m_i_file_acl_high;
684 __u32 m_i_reserved2[2];
685 } masix2;
686 } osd2; /* OS dependent 2 */
687 __le16 i_extra_isize;
688 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
689 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
690 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
691 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
692 __le32 i_crtime; /* File Creation time */
693 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
694 __le32 i_version_hi; /* high 32 bits for 64-bit version */
695 };
696
697 struct move_extent {
698 __u32 reserved; /* should be zero */
699 __u32 donor_fd; /* donor file descriptor */
700 __u64 orig_start; /* logical start offset in block for orig */
701 __u64 donor_start; /* logical start offset in block for donor */
702 __u64 len; /* block length to be moved */
703 __u64 moved_len; /* moved block length */
704 };
705
706 #define EXT4_EPOCH_BITS 2
707 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
708 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
709
710 /*
711 * Extended fields will fit into an inode if the filesystem was formatted
712 * with large inodes (-I 256 or larger) and there are not currently any EAs
713 * consuming all of the available space. For new inodes we always reserve
714 * enough space for the kernel's known extended fields, but for inodes
715 * created with an old kernel this might not have been the case. None of
716 * the extended inode fields is critical for correct filesystem operation.
717 * This macro checks if a certain field fits in the inode. Note that
718 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
719 */
720 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
721 ((offsetof(typeof(*ext4_inode), field) + \
722 sizeof((ext4_inode)->field)) \
723 <= (EXT4_GOOD_OLD_INODE_SIZE + \
724 (einode)->i_extra_isize)) \
725
726 static inline __le32 ext4_encode_extra_time(struct timespec *time)
727 {
728 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
729 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
730 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
731 }
732
733 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
734 {
735 if (sizeof(time->tv_sec) > 4)
736 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
737 << 32;
738 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
739 }
740
741 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
742 do { \
743 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
744 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
745 (raw_inode)->xtime ## _extra = \
746 ext4_encode_extra_time(&(inode)->xtime); \
747 } while (0)
748
749 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
750 do { \
751 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
752 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
753 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
754 (raw_inode)->xtime ## _extra = \
755 ext4_encode_extra_time(&(einode)->xtime); \
756 } while (0)
757
758 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
759 do { \
760 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
761 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
762 ext4_decode_extra_time(&(inode)->xtime, \
763 raw_inode->xtime ## _extra); \
764 else \
765 (inode)->xtime.tv_nsec = 0; \
766 } while (0)
767
768 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
769 do { \
770 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
771 (einode)->xtime.tv_sec = \
772 (signed)le32_to_cpu((raw_inode)->xtime); \
773 else \
774 (einode)->xtime.tv_sec = 0; \
775 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
776 ext4_decode_extra_time(&(einode)->xtime, \
777 raw_inode->xtime ## _extra); \
778 else \
779 (einode)->xtime.tv_nsec = 0; \
780 } while (0)
781
782 #define i_disk_version osd1.linux1.l_i_version
783
784 #if defined(__KERNEL__) || defined(__linux__)
785 #define i_reserved1 osd1.linux1.l_i_reserved1
786 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
787 #define i_blocks_high osd2.linux2.l_i_blocks_high
788 #define i_uid_low i_uid
789 #define i_gid_low i_gid
790 #define i_uid_high osd2.linux2.l_i_uid_high
791 #define i_gid_high osd2.linux2.l_i_gid_high
792 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
793
794 #elif defined(__GNU__)
795
796 #define i_translator osd1.hurd1.h_i_translator
797 #define i_uid_high osd2.hurd2.h_i_uid_high
798 #define i_gid_high osd2.hurd2.h_i_gid_high
799 #define i_author osd2.hurd2.h_i_author
800
801 #elif defined(__masix__)
802
803 #define i_reserved1 osd1.masix1.m_i_reserved1
804 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
805 #define i_reserved2 osd2.masix2.m_i_reserved2
806
807 #endif /* defined(__KERNEL__) || defined(__linux__) */
808
809 #include "extents_status.h"
810
811 /*
812 * fourth extended file system inode data in memory
813 */
814 struct ext4_inode_info {
815 __le32 i_data[15]; /* unconverted */
816 __u32 i_dtime;
817 ext4_fsblk_t i_file_acl;
818
819 /*
820 * i_block_group is the number of the block group which contains
821 * this file's inode. Constant across the lifetime of the inode,
822 * it is ued for making block allocation decisions - we try to
823 * place a file's data blocks near its inode block, and new inodes
824 * near to their parent directory's inode.
825 */
826 ext4_group_t i_block_group;
827 ext4_lblk_t i_dir_start_lookup;
828 #if (BITS_PER_LONG < 64)
829 unsigned long i_state_flags; /* Dynamic state flags */
830 #endif
831 unsigned long i_flags;
832
833 /*
834 * Extended attributes can be read independently of the main file
835 * data. Taking i_mutex even when reading would cause contention
836 * between readers of EAs and writers of regular file data, so
837 * instead we synchronize on xattr_sem when reading or changing
838 * EAs.
839 */
840 struct rw_semaphore xattr_sem;
841
842 struct list_head i_orphan; /* unlinked but open inodes */
843
844 /*
845 * i_disksize keeps track of what the inode size is ON DISK, not
846 * in memory. During truncate, i_size is set to the new size by
847 * the VFS prior to calling ext4_truncate(), but the filesystem won't
848 * set i_disksize to 0 until the truncate is actually under way.
849 *
850 * The intent is that i_disksize always represents the blocks which
851 * are used by this file. This allows recovery to restart truncate
852 * on orphans if we crash during truncate. We actually write i_disksize
853 * into the on-disk inode when writing inodes out, instead of i_size.
854 *
855 * The only time when i_disksize and i_size may be different is when
856 * a truncate is in progress. The only things which change i_disksize
857 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
858 */
859 loff_t i_disksize;
860
861 /*
862 * i_data_sem is for serialising ext4_truncate() against
863 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
864 * data tree are chopped off during truncate. We can't do that in
865 * ext4 because whenever we perform intermediate commits during
866 * truncate, the inode and all the metadata blocks *must* be in a
867 * consistent state which allows truncation of the orphans to restart
868 * during recovery. Hence we must fix the get_block-vs-truncate race
869 * by other means, so we have i_data_sem.
870 */
871 struct rw_semaphore i_data_sem;
872 struct inode vfs_inode;
873 struct jbd2_inode *jinode;
874
875 spinlock_t i_raw_lock; /* protects updates to the raw inode */
876
877 /*
878 * File creation time. Its function is same as that of
879 * struct timespec i_{a,c,m}time in the generic inode.
880 */
881 struct timespec i_crtime;
882
883 /* mballoc */
884 struct list_head i_prealloc_list;
885 spinlock_t i_prealloc_lock;
886
887 /* extents status tree */
888 struct ext4_es_tree i_es_tree;
889 rwlock_t i_es_lock;
890 struct list_head i_es_list;
891 unsigned int i_es_all_nr; /* protected by i_es_lock */
892 unsigned int i_es_shk_nr; /* protected by i_es_lock */
893 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
894 extents to shrink. Protected by
895 i_es_lock */
896
897 /* ialloc */
898 ext4_group_t i_last_alloc_group;
899
900 /* allocation reservation info for delalloc */
901 /* In case of bigalloc, these refer to clusters rather than blocks */
902 unsigned int i_reserved_data_blocks;
903 unsigned int i_reserved_meta_blocks;
904 unsigned int i_allocated_meta_blocks;
905 ext4_lblk_t i_da_metadata_calc_last_lblock;
906 int i_da_metadata_calc_len;
907
908 /* on-disk additional length */
909 __u16 i_extra_isize;
910
911 /* Indicate the inline data space. */
912 u16 i_inline_off;
913 u16 i_inline_size;
914
915 #ifdef CONFIG_QUOTA
916 /* quota space reservation, managed internally by quota code */
917 qsize_t i_reserved_quota;
918 #endif
919
920 /* Lock protecting lists below */
921 spinlock_t i_completed_io_lock;
922 /*
923 * Completed IOs that need unwritten extents handling and have
924 * transaction reserved
925 */
926 struct list_head i_rsv_conversion_list;
927 /*
928 * Completed IOs that need unwritten extents handling and don't have
929 * transaction reserved
930 */
931 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
932 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
933 struct work_struct i_rsv_conversion_work;
934
935 spinlock_t i_block_reservation_lock;
936
937 /*
938 * Transactions that contain inode's metadata needed to complete
939 * fsync and fdatasync, respectively.
940 */
941 tid_t i_sync_tid;
942 tid_t i_datasync_tid;
943
944 #ifdef CONFIG_QUOTA
945 struct dquot *i_dquot[MAXQUOTAS];
946 #endif
947
948 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
949 __u32 i_csum_seed;
950
951 #ifdef CONFIG_EXT4_FS_ENCRYPTION
952 /* Encryption params */
953 struct ext4_crypt_info *i_crypt_info;
954 #endif
955 };
956
957 /*
958 * File system states
959 */
960 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
961 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
962 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
963
964 /*
965 * Misc. filesystem flags
966 */
967 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
968 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
969 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
970
971 /*
972 * Mount flags set via mount options or defaults
973 */
974 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
975 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
976 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
977 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
978 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
979 #define EXT4_MOUNT_ERRORS_MASK 0x00070
980 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
981 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
982 #ifdef CONFIG_FS_DAX
983 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
984 #else
985 #define EXT4_MOUNT_DAX 0
986 #endif
987 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
988 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
989 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
990 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
991 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
992 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
993 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
994 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
995 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
996 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
997 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
998 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
999 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
1000 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1001 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1002 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1003 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1004 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1005 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1006 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1007 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1008
1009 /*
1010 * Mount flags set either automatically (could not be set by mount option)
1011 * based on per file system feature or property or in special cases such as
1012 * distinguishing between explicit mount option definition and default.
1013 */
1014 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1015 specified delalloc */
1016 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1017 size of blocksize * 8
1018 blocks */
1019 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1020 file systems */
1021
1022 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1023 ~EXT4_MOUNT_##opt
1024 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1025 EXT4_MOUNT_##opt
1026 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1027 EXT4_MOUNT_##opt)
1028
1029 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1030 ~EXT4_MOUNT2_##opt
1031 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1032 EXT4_MOUNT2_##opt
1033 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1034 EXT4_MOUNT2_##opt)
1035
1036 #define ext4_test_and_set_bit __test_and_set_bit_le
1037 #define ext4_set_bit __set_bit_le
1038 #define ext4_set_bit_atomic ext2_set_bit_atomic
1039 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1040 #define ext4_clear_bit __clear_bit_le
1041 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1042 #define ext4_test_bit test_bit_le
1043 #define ext4_find_next_zero_bit find_next_zero_bit_le
1044 #define ext4_find_next_bit find_next_bit_le
1045
1046 extern void ext4_set_bits(void *bm, int cur, int len);
1047
1048 /*
1049 * Maximal mount counts between two filesystem checks
1050 */
1051 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1052 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1053
1054 /*
1055 * Behaviour when detecting errors
1056 */
1057 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1058 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1059 #define EXT4_ERRORS_PANIC 3 /* Panic */
1060 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1061
1062 /* Metadata checksum algorithm codes */
1063 #define EXT4_CRC32C_CHKSUM 1
1064
1065 /*
1066 * Structure of the super block
1067 */
1068 struct ext4_super_block {
1069 /*00*/ __le32 s_inodes_count; /* Inodes count */
1070 __le32 s_blocks_count_lo; /* Blocks count */
1071 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1072 __le32 s_free_blocks_count_lo; /* Free blocks count */
1073 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1074 __le32 s_first_data_block; /* First Data Block */
1075 __le32 s_log_block_size; /* Block size */
1076 __le32 s_log_cluster_size; /* Allocation cluster size */
1077 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1078 __le32 s_clusters_per_group; /* # Clusters per group */
1079 __le32 s_inodes_per_group; /* # Inodes per group */
1080 __le32 s_mtime; /* Mount time */
1081 /*30*/ __le32 s_wtime; /* Write time */
1082 __le16 s_mnt_count; /* Mount count */
1083 __le16 s_max_mnt_count; /* Maximal mount count */
1084 __le16 s_magic; /* Magic signature */
1085 __le16 s_state; /* File system state */
1086 __le16 s_errors; /* Behaviour when detecting errors */
1087 __le16 s_minor_rev_level; /* minor revision level */
1088 /*40*/ __le32 s_lastcheck; /* time of last check */
1089 __le32 s_checkinterval; /* max. time between checks */
1090 __le32 s_creator_os; /* OS */
1091 __le32 s_rev_level; /* Revision level */
1092 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1093 __le16 s_def_resgid; /* Default gid for reserved blocks */
1094 /*
1095 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1096 *
1097 * Note: the difference between the compatible feature set and
1098 * the incompatible feature set is that if there is a bit set
1099 * in the incompatible feature set that the kernel doesn't
1100 * know about, it should refuse to mount the filesystem.
1101 *
1102 * e2fsck's requirements are more strict; if it doesn't know
1103 * about a feature in either the compatible or incompatible
1104 * feature set, it must abort and not try to meddle with
1105 * things it doesn't understand...
1106 */
1107 __le32 s_first_ino; /* First non-reserved inode */
1108 __le16 s_inode_size; /* size of inode structure */
1109 __le16 s_block_group_nr; /* block group # of this superblock */
1110 __le32 s_feature_compat; /* compatible feature set */
1111 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1112 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1113 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1114 /*78*/ char s_volume_name[16]; /* volume name */
1115 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1116 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1117 /*
1118 * Performance hints. Directory preallocation should only
1119 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1120 */
1121 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1122 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1123 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1124 /*
1125 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1126 */
1127 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1128 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1129 __le32 s_journal_dev; /* device number of journal file */
1130 __le32 s_last_orphan; /* start of list of inodes to delete */
1131 __le32 s_hash_seed[4]; /* HTREE hash seed */
1132 __u8 s_def_hash_version; /* Default hash version to use */
1133 __u8 s_jnl_backup_type;
1134 __le16 s_desc_size; /* size of group descriptor */
1135 /*100*/ __le32 s_default_mount_opts;
1136 __le32 s_first_meta_bg; /* First metablock block group */
1137 __le32 s_mkfs_time; /* When the filesystem was created */
1138 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1139 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1140 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1141 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1142 __le32 s_free_blocks_count_hi; /* Free blocks count */
1143 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1144 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1145 __le32 s_flags; /* Miscellaneous flags */
1146 __le16 s_raid_stride; /* RAID stride */
1147 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1148 __le64 s_mmp_block; /* Block for multi-mount protection */
1149 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1150 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1151 __u8 s_checksum_type; /* metadata checksum algorithm used */
1152 __u8 s_encryption_level; /* versioning level for encryption */
1153 __u8 s_reserved_pad; /* Padding to next 32bits */
1154 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1155 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1156 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1157 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1158 snapshot's future use */
1159 __le32 s_snapshot_list; /* inode number of the head of the
1160 on-disk snapshot list */
1161 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1162 __le32 s_error_count; /* number of fs errors */
1163 __le32 s_first_error_time; /* first time an error happened */
1164 __le32 s_first_error_ino; /* inode involved in first error */
1165 __le64 s_first_error_block; /* block involved of first error */
1166 __u8 s_first_error_func[32]; /* function where the error happened */
1167 __le32 s_first_error_line; /* line number where error happened */
1168 __le32 s_last_error_time; /* most recent time of an error */
1169 __le32 s_last_error_ino; /* inode involved in last error */
1170 __le32 s_last_error_line; /* line number where error happened */
1171 __le64 s_last_error_block; /* block involved of last error */
1172 __u8 s_last_error_func[32]; /* function where the error happened */
1173 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1174 __u8 s_mount_opts[64];
1175 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1176 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1177 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1178 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1179 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1180 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1181 __le32 s_lpf_ino; /* Location of the lost+found inode */
1182 __le32 s_reserved[100]; /* Padding to the end of the block */
1183 __le32 s_checksum; /* crc32c(superblock) */
1184 };
1185
1186 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1187
1188 #ifdef __KERNEL__
1189
1190 /*
1191 * run-time mount flags
1192 */
1193 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1194 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1195 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1196
1197 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1198 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1199 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1200 #else
1201 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1202 #endif
1203
1204 /* Number of quota types we support */
1205 #define EXT4_MAXQUOTAS 2
1206
1207 /*
1208 * fourth extended-fs super-block data in memory
1209 */
1210 struct ext4_sb_info {
1211 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1212 unsigned long s_inodes_per_block;/* Number of inodes per block */
1213 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1214 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1215 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1216 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1217 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1218 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1219 ext4_group_t s_groups_count; /* Number of groups in the fs */
1220 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1221 unsigned long s_overhead; /* # of fs overhead clusters */
1222 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1223 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1224 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1225 struct buffer_head * s_sbh; /* Buffer containing the super block */
1226 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1227 struct buffer_head **s_group_desc;
1228 unsigned int s_mount_opt;
1229 unsigned int s_mount_opt2;
1230 unsigned int s_mount_flags;
1231 unsigned int s_def_mount_opt;
1232 ext4_fsblk_t s_sb_block;
1233 atomic64_t s_resv_clusters;
1234 kuid_t s_resuid;
1235 kgid_t s_resgid;
1236 unsigned short s_mount_state;
1237 unsigned short s_pad;
1238 int s_addr_per_block_bits;
1239 int s_desc_per_block_bits;
1240 int s_inode_size;
1241 int s_first_ino;
1242 unsigned int s_inode_readahead_blks;
1243 unsigned int s_inode_goal;
1244 spinlock_t s_next_gen_lock;
1245 u32 s_next_generation;
1246 u32 s_hash_seed[4];
1247 int s_def_hash_version;
1248 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1249 struct percpu_counter s_freeclusters_counter;
1250 struct percpu_counter s_freeinodes_counter;
1251 struct percpu_counter s_dirs_counter;
1252 struct percpu_counter s_dirtyclusters_counter;
1253 struct blockgroup_lock *s_blockgroup_lock;
1254 struct proc_dir_entry *s_proc;
1255 struct kobject s_kobj;
1256 struct completion s_kobj_unregister;
1257 struct super_block *s_sb;
1258
1259 /* Journaling */
1260 struct journal_s *s_journal;
1261 struct list_head s_orphan;
1262 struct mutex s_orphan_lock;
1263 unsigned long s_resize_flags; /* Flags indicating if there
1264 is a resizer */
1265 unsigned long s_commit_interval;
1266 u32 s_max_batch_time;
1267 u32 s_min_batch_time;
1268 struct block_device *journal_bdev;
1269 #ifdef CONFIG_QUOTA
1270 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
1271 int s_jquota_fmt; /* Format of quota to use */
1272 #endif
1273 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1274 struct rb_root system_blks;
1275
1276 #ifdef EXTENTS_STATS
1277 /* ext4 extents stats */
1278 unsigned long s_ext_min;
1279 unsigned long s_ext_max;
1280 unsigned long s_depth_max;
1281 spinlock_t s_ext_stats_lock;
1282 unsigned long s_ext_blocks;
1283 unsigned long s_ext_extents;
1284 #endif
1285
1286 /* for buddy allocator */
1287 struct ext4_group_info ***s_group_info;
1288 struct inode *s_buddy_cache;
1289 spinlock_t s_md_lock;
1290 unsigned short *s_mb_offsets;
1291 unsigned int *s_mb_maxs;
1292 unsigned int s_group_info_size;
1293
1294 /* tunables */
1295 unsigned long s_stripe;
1296 unsigned int s_mb_stream_request;
1297 unsigned int s_mb_max_to_scan;
1298 unsigned int s_mb_min_to_scan;
1299 unsigned int s_mb_stats;
1300 unsigned int s_mb_order2_reqs;
1301 unsigned int s_mb_group_prealloc;
1302 unsigned int s_max_dir_size_kb;
1303 /* where last allocation was done - for stream allocation */
1304 unsigned long s_mb_last_group;
1305 unsigned long s_mb_last_start;
1306
1307 /* stats for buddy allocator */
1308 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1309 atomic_t s_bal_success; /* we found long enough chunks */
1310 atomic_t s_bal_allocated; /* in blocks */
1311 atomic_t s_bal_ex_scanned; /* total extents scanned */
1312 atomic_t s_bal_goals; /* goal hits */
1313 atomic_t s_bal_breaks; /* too long searches */
1314 atomic_t s_bal_2orders; /* 2^order hits */
1315 spinlock_t s_bal_lock;
1316 unsigned long s_mb_buddies_generated;
1317 unsigned long long s_mb_generation_time;
1318 atomic_t s_mb_lost_chunks;
1319 atomic_t s_mb_preallocated;
1320 atomic_t s_mb_discarded;
1321 atomic_t s_lock_busy;
1322
1323 /* locality groups */
1324 struct ext4_locality_group __percpu *s_locality_groups;
1325
1326 /* for write statistics */
1327 unsigned long s_sectors_written_start;
1328 u64 s_kbytes_written;
1329
1330 /* the size of zero-out chunk */
1331 unsigned int s_extent_max_zeroout_kb;
1332
1333 unsigned int s_log_groups_per_flex;
1334 struct flex_groups *s_flex_groups;
1335 ext4_group_t s_flex_groups_allocated;
1336
1337 /* workqueue for reserved extent conversions (buffered io) */
1338 struct workqueue_struct *rsv_conversion_wq;
1339
1340 /* timer for periodic error stats printing */
1341 struct timer_list s_err_report;
1342
1343 /* Lazy inode table initialization info */
1344 struct ext4_li_request *s_li_request;
1345 /* Wait multiplier for lazy initialization thread */
1346 unsigned int s_li_wait_mult;
1347
1348 /* Kernel thread for multiple mount protection */
1349 struct task_struct *s_mmp_tsk;
1350
1351 /* record the last minlen when FITRIM is called. */
1352 atomic_t s_last_trim_minblks;
1353
1354 /* Reference to checksum algorithm driver via cryptoapi */
1355 struct crypto_shash *s_chksum_driver;
1356
1357 /* Precomputed FS UUID checksum for seeding other checksums */
1358 __u32 s_csum_seed;
1359
1360 /* Reclaim extents from extent status tree */
1361 struct shrinker s_es_shrinker;
1362 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1363 long s_es_nr_inode;
1364 struct ext4_es_stats s_es_stats;
1365 struct mb_cache *s_mb_cache;
1366 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1367
1368 /* Ratelimit ext4 messages. */
1369 struct ratelimit_state s_err_ratelimit_state;
1370 struct ratelimit_state s_warning_ratelimit_state;
1371 struct ratelimit_state s_msg_ratelimit_state;
1372 };
1373
1374 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1375 {
1376 return sb->s_fs_info;
1377 }
1378 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1379 {
1380 return container_of(inode, struct ext4_inode_info, vfs_inode);
1381 }
1382
1383 static inline struct timespec ext4_current_time(struct inode *inode)
1384 {
1385 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1386 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1387 }
1388
1389 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1390 {
1391 return ino == EXT4_ROOT_INO ||
1392 ino == EXT4_USR_QUOTA_INO ||
1393 ino == EXT4_GRP_QUOTA_INO ||
1394 ino == EXT4_BOOT_LOADER_INO ||
1395 ino == EXT4_JOURNAL_INO ||
1396 ino == EXT4_RESIZE_INO ||
1397 (ino >= EXT4_FIRST_INO(sb) &&
1398 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1399 }
1400
1401 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1402 struct ext4_io_end *io_end)
1403 {
1404 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1405 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1406 atomic_inc(&EXT4_I(inode)->i_unwritten);
1407 }
1408 }
1409
1410 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1411 {
1412 return inode->i_private;
1413 }
1414
1415 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1416 {
1417 inode->i_private = io;
1418 }
1419
1420 /*
1421 * Inode dynamic state flags
1422 */
1423 enum {
1424 EXT4_STATE_JDATA, /* journaled data exists */
1425 EXT4_STATE_NEW, /* inode is newly created */
1426 EXT4_STATE_XATTR, /* has in-inode xattrs */
1427 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1428 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1429 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1430 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1431 EXT4_STATE_NEWENTRY, /* File just added to dir */
1432 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1433 nolocking */
1434 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1435 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1436 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1437 };
1438
1439 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1440 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1441 { \
1442 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1443 } \
1444 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1445 { \
1446 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1447 } \
1448 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1449 { \
1450 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1451 }
1452
1453 /* Add these declarations here only so that these functions can be
1454 * found by name. Otherwise, they are very hard to locate. */
1455 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1456 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1457 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1458 EXT4_INODE_BIT_FNS(flag, flags, 0)
1459
1460 /* Add these declarations here only so that these functions can be
1461 * found by name. Otherwise, they are very hard to locate. */
1462 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1463 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1464 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1465 #if (BITS_PER_LONG < 64)
1466 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1467
1468 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1469 {
1470 (ei)->i_state_flags = 0;
1471 }
1472 #else
1473 EXT4_INODE_BIT_FNS(state, flags, 32)
1474
1475 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1476 {
1477 /* We depend on the fact that callers will set i_flags */
1478 }
1479 #endif
1480 #else
1481 /* Assume that user mode programs are passing in an ext4fs superblock, not
1482 * a kernel struct super_block. This will allow us to call the feature-test
1483 * macros from user land. */
1484 #define EXT4_SB(sb) (sb)
1485 #endif
1486
1487 /*
1488 * Returns true if the inode is inode is encrypted
1489 */
1490 static inline int ext4_encrypted_inode(struct inode *inode)
1491 {
1492 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1493 return ext4_test_inode_flag(inode, EXT4_INODE_ENCRYPT);
1494 #else
1495 return 0;
1496 #endif
1497 }
1498
1499 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1500
1501 /*
1502 * Codes for operating systems
1503 */
1504 #define EXT4_OS_LINUX 0
1505 #define EXT4_OS_HURD 1
1506 #define EXT4_OS_MASIX 2
1507 #define EXT4_OS_FREEBSD 3
1508 #define EXT4_OS_LITES 4
1509
1510 /*
1511 * Revision levels
1512 */
1513 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1514 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1515
1516 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1517 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1518
1519 #define EXT4_GOOD_OLD_INODE_SIZE 128
1520
1521 /*
1522 * Feature set definitions
1523 */
1524
1525 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1526 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1527 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1528 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1529 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1530 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1531 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1532 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1533 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1534 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1535 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1536 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1537 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1538 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1539 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1540 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1541 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1542 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1543
1544 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1545 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1546 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1547 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1548 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1549 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1550 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1551
1552 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1553 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1554 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1555 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1556 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1557 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1558 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1559 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1560 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1561 /*
1562 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1563 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1564 * all other data structures' checksums. However, the METADATA_CSUM and
1565 * GDT_CSUM bits are mutually exclusive.
1566 */
1567 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1568 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1569
1570 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1571 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1572 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1573 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1574 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1575 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1576 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1577 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1578 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1579 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1580 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1581 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1582 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1583 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1584 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1585
1586 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1587 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1588 EXT4_FEATURE_INCOMPAT_META_BG)
1589 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1590 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1591 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1592
1593 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1594 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1595 EXT4_FEATURE_INCOMPAT_RECOVER| \
1596 EXT4_FEATURE_INCOMPAT_META_BG)
1597 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1598 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1599 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1600
1601 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1602 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1603 EXT4_FEATURE_INCOMPAT_RECOVER| \
1604 EXT4_FEATURE_INCOMPAT_META_BG| \
1605 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1606 EXT4_FEATURE_INCOMPAT_64BIT| \
1607 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1608 EXT4_FEATURE_INCOMPAT_MMP | \
1609 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1610 EXT4_FEATURE_INCOMPAT_ENCRYPT)
1611 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1612 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1613 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1614 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1615 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1616 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1617 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1618 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1619 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1620 EXT4_FEATURE_RO_COMPAT_QUOTA)
1621
1622 /*
1623 * Default values for user and/or group using reserved blocks
1624 */
1625 #define EXT4_DEF_RESUID 0
1626 #define EXT4_DEF_RESGID 0
1627
1628 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1629
1630 /*
1631 * Default mount options
1632 */
1633 #define EXT4_DEFM_DEBUG 0x0001
1634 #define EXT4_DEFM_BSDGROUPS 0x0002
1635 #define EXT4_DEFM_XATTR_USER 0x0004
1636 #define EXT4_DEFM_ACL 0x0008
1637 #define EXT4_DEFM_UID16 0x0010
1638 #define EXT4_DEFM_JMODE 0x0060
1639 #define EXT4_DEFM_JMODE_DATA 0x0020
1640 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1641 #define EXT4_DEFM_JMODE_WBACK 0x0060
1642 #define EXT4_DEFM_NOBARRIER 0x0100
1643 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1644 #define EXT4_DEFM_DISCARD 0x0400
1645 #define EXT4_DEFM_NODELALLOC 0x0800
1646
1647 /*
1648 * Default journal batch times
1649 */
1650 #define EXT4_DEF_MIN_BATCH_TIME 0
1651 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1652
1653 /*
1654 * Minimum number of groups in a flexgroup before we separate out
1655 * directories into the first block group of a flexgroup
1656 */
1657 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1658
1659 /*
1660 * Structure of a directory entry
1661 */
1662 #define EXT4_NAME_LEN 255
1663
1664 struct ext4_dir_entry {
1665 __le32 inode; /* Inode number */
1666 __le16 rec_len; /* Directory entry length */
1667 __le16 name_len; /* Name length */
1668 char name[EXT4_NAME_LEN]; /* File name */
1669 };
1670
1671 /*
1672 * The new version of the directory entry. Since EXT4 structures are
1673 * stored in intel byte order, and the name_len field could never be
1674 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1675 * file_type field.
1676 */
1677 struct ext4_dir_entry_2 {
1678 __le32 inode; /* Inode number */
1679 __le16 rec_len; /* Directory entry length */
1680 __u8 name_len; /* Name length */
1681 __u8 file_type;
1682 char name[EXT4_NAME_LEN]; /* File name */
1683 };
1684
1685 /*
1686 * This is a bogus directory entry at the end of each leaf block that
1687 * records checksums.
1688 */
1689 struct ext4_dir_entry_tail {
1690 __le32 det_reserved_zero1; /* Pretend to be unused */
1691 __le16 det_rec_len; /* 12 */
1692 __u8 det_reserved_zero2; /* Zero name length */
1693 __u8 det_reserved_ft; /* 0xDE, fake file type */
1694 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1695 };
1696
1697 #define EXT4_DIRENT_TAIL(block, blocksize) \
1698 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1699 ((blocksize) - \
1700 sizeof(struct ext4_dir_entry_tail))))
1701
1702 /*
1703 * Ext4 directory file types. Only the low 3 bits are used. The
1704 * other bits are reserved for now.
1705 */
1706 #define EXT4_FT_UNKNOWN 0
1707 #define EXT4_FT_REG_FILE 1
1708 #define EXT4_FT_DIR 2
1709 #define EXT4_FT_CHRDEV 3
1710 #define EXT4_FT_BLKDEV 4
1711 #define EXT4_FT_FIFO 5
1712 #define EXT4_FT_SOCK 6
1713 #define EXT4_FT_SYMLINK 7
1714
1715 #define EXT4_FT_MAX 8
1716
1717 #define EXT4_FT_DIR_CSUM 0xDE
1718
1719 /*
1720 * EXT4_DIR_PAD defines the directory entries boundaries
1721 *
1722 * NOTE: It must be a multiple of 4
1723 */
1724 #define EXT4_DIR_PAD 4
1725 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1726 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1727 ~EXT4_DIR_ROUND)
1728 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1729
1730 /*
1731 * If we ever get support for fs block sizes > page_size, we'll need
1732 * to remove the #if statements in the next two functions...
1733 */
1734 static inline unsigned int
1735 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1736 {
1737 unsigned len = le16_to_cpu(dlen);
1738
1739 #if (PAGE_CACHE_SIZE >= 65536)
1740 if (len == EXT4_MAX_REC_LEN || len == 0)
1741 return blocksize;
1742 return (len & 65532) | ((len & 3) << 16);
1743 #else
1744 return len;
1745 #endif
1746 }
1747
1748 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1749 {
1750 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1751 BUG();
1752 #if (PAGE_CACHE_SIZE >= 65536)
1753 if (len < 65536)
1754 return cpu_to_le16(len);
1755 if (len == blocksize) {
1756 if (blocksize == 65536)
1757 return cpu_to_le16(EXT4_MAX_REC_LEN);
1758 else
1759 return cpu_to_le16(0);
1760 }
1761 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1762 #else
1763 return cpu_to_le16(len);
1764 #endif
1765 }
1766
1767 /*
1768 * Hash Tree Directory indexing
1769 * (c) Daniel Phillips, 2001
1770 */
1771
1772 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1773 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1774 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1775 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1776 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1777
1778 /* Legal values for the dx_root hash_version field: */
1779
1780 #define DX_HASH_LEGACY 0
1781 #define DX_HASH_HALF_MD4 1
1782 #define DX_HASH_TEA 2
1783 #define DX_HASH_LEGACY_UNSIGNED 3
1784 #define DX_HASH_HALF_MD4_UNSIGNED 4
1785 #define DX_HASH_TEA_UNSIGNED 5
1786
1787 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1788 const void *address, unsigned int length)
1789 {
1790 struct {
1791 struct shash_desc shash;
1792 char ctx[4];
1793 } desc;
1794 int err;
1795
1796 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1797
1798 desc.shash.tfm = sbi->s_chksum_driver;
1799 desc.shash.flags = 0;
1800 *(u32 *)desc.ctx = crc;
1801
1802 err = crypto_shash_update(&desc.shash, address, length);
1803 BUG_ON(err);
1804
1805 return *(u32 *)desc.ctx;
1806 }
1807
1808 #ifdef __KERNEL__
1809
1810 /* hash info structure used by the directory hash */
1811 struct dx_hash_info
1812 {
1813 u32 hash;
1814 u32 minor_hash;
1815 int hash_version;
1816 u32 *seed;
1817 };
1818
1819
1820 /* 32 and 64 bit signed EOF for dx directories */
1821 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1822 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1823
1824
1825 /*
1826 * Control parameters used by ext4_htree_next_block
1827 */
1828 #define HASH_NB_ALWAYS 1
1829
1830 struct ext4_filename {
1831 const struct qstr *usr_fname;
1832 struct ext4_str disk_name;
1833 struct dx_hash_info hinfo;
1834 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1835 struct ext4_str crypto_buf;
1836 #endif
1837 };
1838
1839 #define fname_name(p) ((p)->disk_name.name)
1840 #define fname_len(p) ((p)->disk_name.len)
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 extern struct kmem_cache *ext4_crypt_info_cachep;
2058 bool ext4_valid_contents_enc_mode(uint32_t mode);
2059 uint32_t ext4_validate_encryption_key_size(uint32_t mode, uint32_t size);
2060 extern struct workqueue_struct *ext4_read_workqueue;
2061 struct ext4_crypto_ctx *ext4_get_crypto_ctx(struct inode *inode);
2062 void ext4_release_crypto_ctx(struct ext4_crypto_ctx *ctx);
2063 void ext4_restore_control_page(struct page *data_page);
2064 struct page *ext4_encrypt(struct inode *inode,
2065 struct page *plaintext_page);
2066 int ext4_decrypt(struct ext4_crypto_ctx *ctx, struct page *page);
2067 int ext4_decrypt_one(struct inode *inode, struct page *page);
2068 int ext4_encrypted_zeroout(struct inode *inode, struct ext4_extent *ex);
2069
2070 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2071 int ext4_init_crypto(void);
2072 void ext4_exit_crypto(void);
2073 static inline int ext4_sb_has_crypto(struct super_block *sb)
2074 {
2075 return EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_ENCRYPT);
2076 }
2077 #else
2078 static inline int ext4_init_crypto(void) { return 0; }
2079 static inline void ext4_exit_crypto(void) { }
2080 static inline int ext4_sb_has_crypto(struct super_block *sb)
2081 {
2082 return 0;
2083 }
2084 #endif
2085
2086 /* crypto_fname.c */
2087 bool ext4_valid_filenames_enc_mode(uint32_t mode);
2088 u32 ext4_fname_crypto_round_up(u32 size, u32 blksize);
2089 unsigned ext4_fname_encrypted_size(struct inode *inode, u32 ilen);
2090 int ext4_fname_crypto_alloc_buffer(struct inode *inode,
2091 u32 ilen, struct ext4_str *crypto_str);
2092 int _ext4_fname_disk_to_usr(struct inode *inode,
2093 struct dx_hash_info *hinfo,
2094 const struct ext4_str *iname,
2095 struct ext4_str *oname);
2096 int ext4_fname_disk_to_usr(struct inode *inode,
2097 struct dx_hash_info *hinfo,
2098 const struct ext4_dir_entry_2 *de,
2099 struct ext4_str *oname);
2100 int ext4_fname_usr_to_disk(struct inode *inode,
2101 const struct qstr *iname,
2102 struct ext4_str *oname);
2103 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2104 void ext4_fname_crypto_free_buffer(struct ext4_str *crypto_str);
2105 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2106 int lookup, struct ext4_filename *fname);
2107 void ext4_fname_free_filename(struct ext4_filename *fname);
2108 #else
2109 static inline
2110 int ext4_setup_fname_crypto(struct inode *inode)
2111 {
2112 return 0;
2113 }
2114 static inline void ext4_fname_crypto_free_buffer(struct ext4_str *p) { }
2115 static inline int ext4_fname_setup_filename(struct inode *dir,
2116 const struct qstr *iname,
2117 int lookup, struct ext4_filename *fname)
2118 {
2119 fname->usr_fname = iname;
2120 fname->disk_name.name = (unsigned char *) iname->name;
2121 fname->disk_name.len = iname->len;
2122 return 0;
2123 }
2124 static inline void ext4_fname_free_filename(struct ext4_filename *fname) { }
2125 #endif
2126
2127
2128 /* crypto_key.c */
2129 void ext4_free_crypt_info(struct ext4_crypt_info *ci);
2130 void ext4_free_encryption_info(struct inode *inode, struct ext4_crypt_info *ci);
2131 int _ext4_get_encryption_info(struct inode *inode);
2132
2133 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2134 int ext4_has_encryption_key(struct inode *inode);
2135
2136 static inline int ext4_get_encryption_info(struct inode *inode)
2137 {
2138 struct ext4_crypt_info *ci = EXT4_I(inode)->i_crypt_info;
2139
2140 if (!ci ||
2141 (ci->ci_keyring_key &&
2142 (ci->ci_keyring_key->flags & ((1 << KEY_FLAG_INVALIDATED) |
2143 (1 << KEY_FLAG_REVOKED) |
2144 (1 << KEY_FLAG_DEAD)))))
2145 return _ext4_get_encryption_info(inode);
2146 return 0;
2147 }
2148
2149 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2150 {
2151 return EXT4_I(inode)->i_crypt_info;
2152 }
2153
2154 #else
2155 static inline int ext4_has_encryption_key(struct inode *inode)
2156 {
2157 return 0;
2158 }
2159 static inline int ext4_get_encryption_info(struct inode *inode)
2160 {
2161 return 0;
2162 }
2163 static inline struct ext4_crypt_info *ext4_encryption_info(struct inode *inode)
2164 {
2165 return NULL;
2166 }
2167 #endif
2168
2169
2170 /* dir.c */
2171 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2172 struct file *,
2173 struct ext4_dir_entry_2 *,
2174 struct buffer_head *, char *, int,
2175 unsigned int);
2176 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2177 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2178 (de), (bh), (buf), (size), (offset)))
2179 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2180 __u32 minor_hash,
2181 struct ext4_dir_entry_2 *dirent,
2182 struct ext4_str *ent_name);
2183 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2184 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2185 struct buffer_head *bh,
2186 void *buf, int buf_size,
2187 struct ext4_filename *fname,
2188 struct ext4_dir_entry_2 **dest_de);
2189 int ext4_insert_dentry(struct inode *dir,
2190 struct inode *inode,
2191 struct ext4_dir_entry_2 *de,
2192 int buf_size,
2193 struct ext4_filename *fname);
2194 static inline void ext4_update_dx_flag(struct inode *inode)
2195 {
2196 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2197 EXT4_FEATURE_COMPAT_DIR_INDEX))
2198 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2199 }
2200 static unsigned char ext4_filetype_table[] = {
2201 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2202 };
2203
2204 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2205 {
2206 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2207 (filetype >= EXT4_FT_MAX))
2208 return DT_UNKNOWN;
2209
2210 return ext4_filetype_table[filetype];
2211 }
2212 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2213 void *buf, int buf_size);
2214
2215 /* fsync.c */
2216 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2217
2218 /* hash.c */
2219 extern int ext4fs_dirhash(const char *name, int len, struct
2220 dx_hash_info *hinfo);
2221
2222 /* ialloc.c */
2223 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2224 const struct qstr *qstr, __u32 goal,
2225 uid_t *owner, int handle_type,
2226 unsigned int line_no, int nblocks);
2227
2228 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2229 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2230 0, 0, 0)
2231 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2232 type, nblocks) \
2233 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2234 (type), __LINE__, (nblocks))
2235
2236
2237 extern void ext4_free_inode(handle_t *, struct inode *);
2238 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2239 extern unsigned long ext4_count_free_inodes(struct super_block *);
2240 extern unsigned long ext4_count_dirs(struct super_block *);
2241 extern void ext4_check_inodes_bitmap(struct super_block *);
2242 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2243 extern int ext4_init_inode_table(struct super_block *sb,
2244 ext4_group_t group, int barrier);
2245 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2246
2247 /* mballoc.c */
2248 extern long ext4_mb_stats;
2249 extern long ext4_mb_max_to_scan;
2250 extern int ext4_mb_init(struct super_block *);
2251 extern int ext4_mb_release(struct super_block *);
2252 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2253 struct ext4_allocation_request *, int *);
2254 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2255 extern void ext4_discard_preallocations(struct inode *);
2256 extern int __init ext4_init_mballoc(void);
2257 extern void ext4_exit_mballoc(void);
2258 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2259 struct buffer_head *bh, ext4_fsblk_t block,
2260 unsigned long count, int flags);
2261 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2262 ext4_group_t ngroups);
2263 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2264 ext4_group_t i, struct ext4_group_desc *desc);
2265 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2266 ext4_fsblk_t block, unsigned long count);
2267 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2268
2269 /* inode.c */
2270 int ext4_inode_is_fast_symlink(struct inode *inode);
2271 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2272 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2273 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2274 struct buffer_head *bh_result, int create);
2275 int ext4_get_block(struct inode *inode, sector_t iblock,
2276 struct buffer_head *bh_result, int create);
2277 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2278 struct buffer_head *bh, int create);
2279 int ext4_walk_page_buffers(handle_t *handle,
2280 struct buffer_head *head,
2281 unsigned from,
2282 unsigned to,
2283 int *partial,
2284 int (*fn)(handle_t *handle,
2285 struct buffer_head *bh));
2286 int do_journal_get_write_access(handle_t *handle,
2287 struct buffer_head *bh);
2288 #define FALL_BACK_TO_NONDELALLOC 1
2289 #define CONVERT_INLINE_DATA 2
2290
2291 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2292 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2293 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2294 extern int ext4_setattr(struct dentry *, struct iattr *);
2295 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2296 struct kstat *stat);
2297 extern void ext4_evict_inode(struct inode *);
2298 extern void ext4_clear_inode(struct inode *);
2299 extern int ext4_sync_inode(handle_t *, struct inode *);
2300 extern void ext4_dirty_inode(struct inode *, int);
2301 extern int ext4_change_inode_journal_flag(struct inode *, int);
2302 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2303 extern int ext4_inode_attach_jinode(struct inode *inode);
2304 extern int ext4_can_truncate(struct inode *inode);
2305 extern void ext4_truncate(struct inode *);
2306 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2307 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2308 extern void ext4_set_inode_flags(struct inode *);
2309 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2310 extern int ext4_alloc_da_blocks(struct inode *inode);
2311 extern void ext4_set_aops(struct inode *inode);
2312 extern int ext4_writepage_trans_blocks(struct inode *);
2313 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2314 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2315 loff_t lstart, loff_t lend);
2316 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2317 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2318 extern void ext4_da_update_reserve_space(struct inode *inode,
2319 int used, int quota_claim);
2320
2321 /* indirect.c */
2322 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2323 struct ext4_map_blocks *map, int flags);
2324 extern ssize_t ext4_ind_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
2325 loff_t offset);
2326 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2327 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2328 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2329 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2330 ext4_lblk_t start, ext4_lblk_t end);
2331
2332 /* ioctl.c */
2333 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2334 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2335
2336 /* migrate.c */
2337 extern int ext4_ext_migrate(struct inode *);
2338 extern int ext4_ind_migrate(struct inode *inode);
2339
2340 /* namei.c */
2341 extern int ext4_dirent_csum_verify(struct inode *inode,
2342 struct ext4_dir_entry *dirent);
2343 extern int ext4_orphan_add(handle_t *, struct inode *);
2344 extern int ext4_orphan_del(handle_t *, struct inode *);
2345 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2346 __u32 start_minor_hash, __u32 *next_hash);
2347 extern int ext4_search_dir(struct buffer_head *bh,
2348 char *search_buf,
2349 int buf_size,
2350 struct inode *dir,
2351 struct ext4_filename *fname,
2352 const struct qstr *d_name,
2353 unsigned int offset,
2354 struct ext4_dir_entry_2 **res_dir);
2355 extern int ext4_generic_delete_entry(handle_t *handle,
2356 struct inode *dir,
2357 struct ext4_dir_entry_2 *de_del,
2358 struct buffer_head *bh,
2359 void *entry_buf,
2360 int buf_size,
2361 int csum_size);
2362 extern int ext4_empty_dir(struct inode *inode);
2363
2364 /* resize.c */
2365 extern int ext4_group_add(struct super_block *sb,
2366 struct ext4_new_group_data *input);
2367 extern int ext4_group_extend(struct super_block *sb,
2368 struct ext4_super_block *es,
2369 ext4_fsblk_t n_blocks_count);
2370 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2371
2372 /* super.c */
2373 extern int ext4_calculate_overhead(struct super_block *sb);
2374 extern void ext4_superblock_csum_set(struct super_block *sb);
2375 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2376 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2377 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2378 ext4_group_t ngroup);
2379 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2380 char nbuf[16]);
2381
2382 extern __printf(4, 5)
2383 void __ext4_error(struct super_block *, const char *, unsigned int,
2384 const char *, ...);
2385 extern __printf(5, 6)
2386 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2387 const char *, ...);
2388 extern __printf(5, 6)
2389 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2390 const char *, ...);
2391 extern void __ext4_std_error(struct super_block *, const char *,
2392 unsigned int, int);
2393 extern __printf(4, 5)
2394 void __ext4_abort(struct super_block *, const char *, unsigned int,
2395 const char *, ...);
2396 extern __printf(4, 5)
2397 void __ext4_warning(struct super_block *, const char *, unsigned int,
2398 const char *, ...);
2399 extern __printf(4, 5)
2400 void __ext4_warning_inode(const struct inode *inode, const char *function,
2401 unsigned int line, const char *fmt, ...);
2402 extern __printf(3, 4)
2403 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2404 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2405 const char *, unsigned int, const char *);
2406 extern __printf(7, 8)
2407 void __ext4_grp_locked_error(const char *, unsigned int,
2408 struct super_block *, ext4_group_t,
2409 unsigned long, ext4_fsblk_t,
2410 const char *, ...);
2411
2412 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2413 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2414
2415 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
2416 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2417
2418 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
2419 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2420
2421 #ifdef CONFIG_PRINTK
2422
2423 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2424 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2425 #define ext4_error_file(file, func, line, block, fmt, ...) \
2426 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2427 #define ext4_error(sb, fmt, ...) \
2428 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2429 #define ext4_abort(sb, fmt, ...) \
2430 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2431 #define ext4_warning(sb, fmt, ...) \
2432 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2433 #define ext4_warning_inode(inode, fmt, ...) \
2434 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2435 #define ext4_msg(sb, level, fmt, ...) \
2436 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2437 #define dump_mmp_msg(sb, mmp, msg) \
2438 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2439 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2440 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2441 fmt, ##__VA_ARGS__)
2442
2443 #else
2444
2445 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2446 do { \
2447 no_printk(fmt, ##__VA_ARGS__); \
2448 __ext4_error_inode(inode, "", 0, block, " "); \
2449 } while (0)
2450 #define ext4_error_file(file, func, line, block, fmt, ...) \
2451 do { \
2452 no_printk(fmt, ##__VA_ARGS__); \
2453 __ext4_error_file(file, "", 0, block, " "); \
2454 } while (0)
2455 #define ext4_error(sb, fmt, ...) \
2456 do { \
2457 no_printk(fmt, ##__VA_ARGS__); \
2458 __ext4_error(sb, "", 0, " "); \
2459 } while (0)
2460 #define ext4_abort(sb, fmt, ...) \
2461 do { \
2462 no_printk(fmt, ##__VA_ARGS__); \
2463 __ext4_abort(sb, "", 0, " "); \
2464 } while (0)
2465 #define ext4_warning(sb, fmt, ...) \
2466 do { \
2467 no_printk(fmt, ##__VA_ARGS__); \
2468 __ext4_warning(sb, "", 0, " "); \
2469 } while (0)
2470 #define ext4_warning_inode(inode, fmt, ...) \
2471 do { \
2472 no_printk(fmt, ##__VA_ARGS__); \
2473 __ext4_warning_inode(inode, "", 0, " "); \
2474 } while (0)
2475 #define ext4_msg(sb, level, fmt, ...) \
2476 do { \
2477 no_printk(fmt, ##__VA_ARGS__); \
2478 __ext4_msg(sb, "", " "); \
2479 } while (0)
2480 #define dump_mmp_msg(sb, mmp, msg) \
2481 __dump_mmp_msg(sb, mmp, "", 0, "")
2482 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2483 do { \
2484 no_printk(fmt, ##__VA_ARGS__); \
2485 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2486 } while (0)
2487
2488 #endif
2489
2490 extern void ext4_update_dynamic_rev(struct super_block *sb);
2491 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2492 __u32 compat);
2493 extern int ext4_update_rocompat_feature(handle_t *handle,
2494 struct super_block *sb, __u32 rocompat);
2495 extern int ext4_update_incompat_feature(handle_t *handle,
2496 struct super_block *sb, __u32 incompat);
2497 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2498 struct ext4_group_desc *bg);
2499 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2500 struct ext4_group_desc *bg);
2501 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2502 struct ext4_group_desc *bg);
2503 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2504 struct ext4_group_desc *bg);
2505 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2506 struct ext4_group_desc *bg);
2507 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2508 struct ext4_group_desc *bg);
2509 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2510 struct ext4_group_desc *bg);
2511 extern void ext4_block_bitmap_set(struct super_block *sb,
2512 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2513 extern void ext4_inode_bitmap_set(struct super_block *sb,
2514 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2515 extern void ext4_inode_table_set(struct super_block *sb,
2516 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2517 extern void ext4_free_group_clusters_set(struct super_block *sb,
2518 struct ext4_group_desc *bg,
2519 __u32 count);
2520 extern void ext4_free_inodes_set(struct super_block *sb,
2521 struct ext4_group_desc *bg, __u32 count);
2522 extern void ext4_used_dirs_set(struct super_block *sb,
2523 struct ext4_group_desc *bg, __u32 count);
2524 extern void ext4_itable_unused_set(struct super_block *sb,
2525 struct ext4_group_desc *bg, __u32 count);
2526 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2527 struct ext4_group_desc *gdp);
2528 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2529 struct ext4_group_desc *gdp);
2530 extern int ext4_register_li_request(struct super_block *sb,
2531 ext4_group_t first_not_zeroed);
2532
2533 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2534 {
2535 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2536 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
2537 (EXT4_SB(sb)->s_chksum_driver != NULL);
2538 }
2539
2540 static inline int ext4_has_metadata_csum(struct super_block *sb)
2541 {
2542 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
2543 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
2544 !EXT4_SB(sb)->s_chksum_driver);
2545
2546 return (EXT4_SB(sb)->s_chksum_driver != NULL);
2547 }
2548 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2549 {
2550 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2551 le32_to_cpu(es->s_blocks_count_lo);
2552 }
2553
2554 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2555 {
2556 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2557 le32_to_cpu(es->s_r_blocks_count_lo);
2558 }
2559
2560 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2561 {
2562 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2563 le32_to_cpu(es->s_free_blocks_count_lo);
2564 }
2565
2566 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2567 ext4_fsblk_t blk)
2568 {
2569 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2570 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2571 }
2572
2573 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2574 ext4_fsblk_t blk)
2575 {
2576 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2577 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2578 }
2579
2580 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2581 ext4_fsblk_t blk)
2582 {
2583 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2584 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2585 }
2586
2587 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2588 {
2589 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2590 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2591 le32_to_cpu(raw_inode->i_size_lo);
2592 else
2593 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2594 }
2595
2596 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2597 {
2598 raw_inode->i_size_lo = cpu_to_le32(i_size);
2599 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2600 }
2601
2602 static inline
2603 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2604 ext4_group_t group)
2605 {
2606 struct ext4_group_info ***grp_info;
2607 long indexv, indexh;
2608 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2609 grp_info = EXT4_SB(sb)->s_group_info;
2610 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2611 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2612 return grp_info[indexv][indexh];
2613 }
2614
2615 /*
2616 * Reading s_groups_count requires using smp_rmb() afterwards. See
2617 * the locking protocol documented in the comments of ext4_group_add()
2618 * in resize.c
2619 */
2620 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2621 {
2622 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2623
2624 smp_rmb();
2625 return ngroups;
2626 }
2627
2628 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2629 ext4_group_t block_group)
2630 {
2631 return block_group >> sbi->s_log_groups_per_flex;
2632 }
2633
2634 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2635 {
2636 return 1 << sbi->s_log_groups_per_flex;
2637 }
2638
2639 #define ext4_std_error(sb, errno) \
2640 do { \
2641 if ((errno)) \
2642 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2643 } while (0)
2644
2645 #ifdef CONFIG_SMP
2646 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2647 * counters. So we need to make sure we have free clusters more
2648 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2649 */
2650 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2651 #else
2652 #define EXT4_FREECLUSTERS_WATERMARK 0
2653 #endif
2654
2655 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2656 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2657 {
2658 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2659 !mutex_is_locked(&inode->i_mutex));
2660 down_write(&EXT4_I(inode)->i_data_sem);
2661 if (newsize > EXT4_I(inode)->i_disksize)
2662 EXT4_I(inode)->i_disksize = newsize;
2663 up_write(&EXT4_I(inode)->i_data_sem);
2664 }
2665
2666 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2667 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2668 {
2669 int changed = 0;
2670
2671 if (newsize > inode->i_size) {
2672 i_size_write(inode, newsize);
2673 changed = 1;
2674 }
2675 if (newsize > EXT4_I(inode)->i_disksize) {
2676 ext4_update_i_disksize(inode, newsize);
2677 changed |= 2;
2678 }
2679 return changed;
2680 }
2681
2682 struct ext4_group_info {
2683 unsigned long bb_state;
2684 struct rb_root bb_free_root;
2685 ext4_grpblk_t bb_first_free; /* first free block */
2686 ext4_grpblk_t bb_free; /* total free blocks */
2687 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2688 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2689 struct list_head bb_prealloc_list;
2690 #ifdef DOUBLE_CHECK
2691 void *bb_bitmap;
2692 #endif
2693 struct rw_semaphore alloc_sem;
2694 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2695 * regions, index is order.
2696 * bb_counters[3] = 5 means
2697 * 5 free 8-block regions. */
2698 };
2699
2700 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2701 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2702 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2703 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2704
2705 #define EXT4_MB_GRP_NEED_INIT(grp) \
2706 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2707 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2708 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2709 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2710 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2711
2712 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2713 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2714 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2715 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2716 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2717 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2718
2719 #define EXT4_MAX_CONTENTION 8
2720 #define EXT4_CONTENTION_THRESHOLD 2
2721
2722 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2723 ext4_group_t group)
2724 {
2725 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2726 }
2727
2728 /*
2729 * Returns true if the filesystem is busy enough that attempts to
2730 * access the block group locks has run into contention.
2731 */
2732 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2733 {
2734 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2735 }
2736
2737 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2738 {
2739 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2740 if (spin_trylock(lock))
2741 /*
2742 * We're able to grab the lock right away, so drop the
2743 * lock contention counter.
2744 */
2745 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2746 else {
2747 /*
2748 * The lock is busy, so bump the contention counter,
2749 * and then wait on the spin lock.
2750 */
2751 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2752 EXT4_MAX_CONTENTION);
2753 spin_lock(lock);
2754 }
2755 }
2756
2757 static inline void ext4_unlock_group(struct super_block *sb,
2758 ext4_group_t group)
2759 {
2760 spin_unlock(ext4_group_lock_ptr(sb, group));
2761 }
2762
2763 /*
2764 * Block validity checking
2765 */
2766 #define ext4_check_indirect_blockref(inode, bh) \
2767 ext4_check_blockref(__func__, __LINE__, inode, \
2768 (__le32 *)(bh)->b_data, \
2769 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2770
2771 #define ext4_ind_check_inode(inode) \
2772 ext4_check_blockref(__func__, __LINE__, inode, \
2773 EXT4_I(inode)->i_data, \
2774 EXT4_NDIR_BLOCKS)
2775
2776 /*
2777 * Inodes and files operations
2778 */
2779
2780 /* dir.c */
2781 extern const struct file_operations ext4_dir_operations;
2782
2783 /* file.c */
2784 extern const struct inode_operations ext4_file_inode_operations;
2785 extern const struct file_operations ext4_file_operations;
2786 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2787
2788 /* inline.c */
2789 extern int ext4_get_max_inline_size(struct inode *inode);
2790 extern int ext4_find_inline_data_nolock(struct inode *inode);
2791 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2792 unsigned int len);
2793 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2794
2795 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2796 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2797 struct inode *inode,
2798 loff_t pos, unsigned len,
2799 unsigned flags,
2800 struct page **pagep);
2801 extern int ext4_write_inline_data_end(struct inode *inode,
2802 loff_t pos, unsigned len,
2803 unsigned copied,
2804 struct page *page);
2805 extern struct buffer_head *
2806 ext4_journalled_write_inline_data(struct inode *inode,
2807 unsigned len,
2808 struct page *page);
2809 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2810 struct inode *inode,
2811 loff_t pos, unsigned len,
2812 unsigned flags,
2813 struct page **pagep,
2814 void **fsdata);
2815 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2816 unsigned len, unsigned copied,
2817 struct page *page);
2818 extern int ext4_try_add_inline_entry(handle_t *handle,
2819 struct ext4_filename *fname,
2820 struct dentry *dentry,
2821 struct inode *inode);
2822 extern int ext4_try_create_inline_dir(handle_t *handle,
2823 struct inode *parent,
2824 struct inode *inode);
2825 extern int ext4_read_inline_dir(struct file *filp,
2826 struct dir_context *ctx,
2827 int *has_inline_data);
2828 extern int htree_inlinedir_to_tree(struct file *dir_file,
2829 struct inode *dir, ext4_lblk_t block,
2830 struct dx_hash_info *hinfo,
2831 __u32 start_hash, __u32 start_minor_hash,
2832 int *has_inline_data);
2833 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2834 struct ext4_filename *fname,
2835 const struct qstr *d_name,
2836 struct ext4_dir_entry_2 **res_dir,
2837 int *has_inline_data);
2838 extern int ext4_delete_inline_entry(handle_t *handle,
2839 struct inode *dir,
2840 struct ext4_dir_entry_2 *de_del,
2841 struct buffer_head *bh,
2842 int *has_inline_data);
2843 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2844 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2845 struct ext4_dir_entry_2 **parent_de,
2846 int *retval);
2847 extern int ext4_inline_data_fiemap(struct inode *inode,
2848 struct fiemap_extent_info *fieinfo,
2849 int *has_inline, __u64 start, __u64 len);
2850 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2851 struct inode *inode,
2852 int needed);
2853 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2854
2855 extern int ext4_convert_inline_data(struct inode *inode);
2856
2857 static inline int ext4_has_inline_data(struct inode *inode)
2858 {
2859 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2860 EXT4_I(inode)->i_inline_off;
2861 }
2862
2863 /* namei.c */
2864 extern const struct inode_operations ext4_dir_inode_operations;
2865 extern const struct inode_operations ext4_special_inode_operations;
2866 extern struct dentry *ext4_get_parent(struct dentry *child);
2867 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2868 struct ext4_dir_entry_2 *de,
2869 int blocksize, int csum_size,
2870 unsigned int parent_ino, int dotdot_real_len);
2871 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2872 unsigned int blocksize);
2873 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2874 struct inode *inode,
2875 struct buffer_head *bh);
2876 #define S_SHIFT 12
2877 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2878 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2879 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2880 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2881 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2882 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2883 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2884 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2885 };
2886
2887 static inline void ext4_set_de_type(struct super_block *sb,
2888 struct ext4_dir_entry_2 *de,
2889 umode_t mode) {
2890 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2891 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2892 }
2893
2894 /* readpages.c */
2895 extern int ext4_mpage_readpages(struct address_space *mapping,
2896 struct list_head *pages, struct page *page,
2897 unsigned nr_pages);
2898
2899 /* symlink.c */
2900 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
2901 extern const struct inode_operations ext4_symlink_inode_operations;
2902 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2903
2904 /* block_validity */
2905 extern void ext4_release_system_zone(struct super_block *sb);
2906 extern int ext4_setup_system_zone(struct super_block *sb);
2907 extern int __init ext4_init_system_zone(void);
2908 extern void ext4_exit_system_zone(void);
2909 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2910 ext4_fsblk_t start_blk,
2911 unsigned int count);
2912 extern int ext4_check_blockref(const char *, unsigned int,
2913 struct inode *, __le32 *, unsigned int);
2914
2915 /* extents.c */
2916 struct ext4_ext_path;
2917 struct ext4_extent;
2918
2919 /*
2920 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2921 * __le32.
2922 */
2923 #define EXT_MAX_BLOCKS 0xffffffff
2924
2925 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2926 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2927 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2928 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2929 struct ext4_map_blocks *map, int flags);
2930 extern void ext4_ext_truncate(handle_t *, struct inode *);
2931 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2932 ext4_lblk_t end);
2933 extern void ext4_ext_init(struct super_block *);
2934 extern void ext4_ext_release(struct super_block *);
2935 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2936 loff_t len);
2937 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2938 loff_t offset, ssize_t len);
2939 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2940 struct ext4_map_blocks *map, int flags);
2941 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2942 ext4_lblk_t lblocks);
2943 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2944 int num,
2945 struct ext4_ext_path *path);
2946 extern int ext4_can_extents_be_merged(struct inode *inode,
2947 struct ext4_extent *ex1,
2948 struct ext4_extent *ex2);
2949 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2950 struct ext4_ext_path **,
2951 struct ext4_extent *, int);
2952 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
2953 struct ext4_ext_path **,
2954 int flags);
2955 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2956 extern int ext4_ext_check_inode(struct inode *inode);
2957 extern int ext4_find_delalloc_range(struct inode *inode,
2958 ext4_lblk_t lblk_start,
2959 ext4_lblk_t lblk_end);
2960 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2961 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
2962 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2963 __u64 start, __u64 len);
2964 extern int ext4_ext_precache(struct inode *inode);
2965 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2966 extern int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len);
2967 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
2968 struct inode *inode2, ext4_lblk_t lblk1,
2969 ext4_lblk_t lblk2, ext4_lblk_t count,
2970 int mark_unwritten,int *err);
2971
2972 /* move_extent.c */
2973 extern void ext4_double_down_write_data_sem(struct inode *first,
2974 struct inode *second);
2975 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2976 struct inode *donor_inode);
2977 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2978 __u64 start_orig, __u64 start_donor,
2979 __u64 len, __u64 *moved_len);
2980
2981 /* page-io.c */
2982 extern int __init ext4_init_pageio(void);
2983 extern void ext4_exit_pageio(void);
2984 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2985 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2986 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2987 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2988 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2989 struct writeback_control *wbc);
2990 extern void ext4_end_io_rsv_work(struct work_struct *work);
2991 extern void ext4_io_submit(struct ext4_io_submit *io);
2992 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2993 struct page *page,
2994 int len,
2995 struct writeback_control *wbc,
2996 bool keep_towrite);
2997
2998 /* mmp.c */
2999 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3000
3001 /*
3002 * Add new method to test whether block and inode bitmaps are properly
3003 * initialized. With uninit_bg reading the block from disk is not enough
3004 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3005 */
3006 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3007
3008 static inline int bitmap_uptodate(struct buffer_head *bh)
3009 {
3010 return (buffer_uptodate(bh) &&
3011 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3012 }
3013 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3014 {
3015 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3016 }
3017
3018 /*
3019 * Disable DIO read nolock optimization, so new dioreaders will be forced
3020 * to grab i_mutex
3021 */
3022 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
3023 {
3024 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3025 smp_mb();
3026 }
3027 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
3028 {
3029 smp_mb();
3030 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
3031 }
3032
3033 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3034
3035 /* For ioend & aio unwritten conversion wait queues */
3036 #define EXT4_WQ_HASH_SZ 37
3037 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3038 EXT4_WQ_HASH_SZ])
3039 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
3040 EXT4_WQ_HASH_SZ])
3041 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3042 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
3043
3044 #define EXT4_RESIZING 0
3045 extern int ext4_resize_begin(struct super_block *sb);
3046 extern void ext4_resize_end(struct super_block *sb);
3047
3048 #endif /* __KERNEL__ */
3049
3050 #endif /* _EXT4_H */
Linux kernel - Deliverables
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