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Merge tag 'regmap-fix-v5.11-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git...
[linux/fpc-iii.git] / fs / ext4 / ext4.h
blob2866d249f3d2673e769c8f72943f2b3fb49c70e8
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * ext4.h
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/include/linux/minix_fs.h
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 */
16
17 #ifndef _EXT4_H
18 #define _EXT4_H
19
20 #include <linux/types.h>
21 #include <linux/blkdev.h>
22 #include <linux/magic.h>
23 #include <linux/jbd2.h>
24 #include <linux/quota.h>
25 #include <linux/rwsem.h>
26 #include <linux/rbtree.h>
27 #include <linux/seqlock.h>
28 #include <linux/mutex.h>
29 #include <linux/timer.h>
30 #include <linux/wait.h>
31 #include <linux/sched/signal.h>
32 #include <linux/blockgroup_lock.h>
33 #include <linux/percpu_counter.h>
34 #include <linux/ratelimit.h>
35 #include <crypto/hash.h>
36 #include <linux/falloc.h>
37 #include <linux/percpu-rwsem.h>
38 #include <linux/fiemap.h>
39 #ifdef __KERNEL__
40 #include <linux/compat.h>
41 #endif
42
43 #include <linux/fscrypt.h>
44 #include <linux/fsverity.h>
45
46 #include <linux/compiler.h>
47
48 /*
49 * The fourth extended filesystem constants/structures
50 */
51
52 /*
53 * with AGGRESSIVE_CHECK allocator runs consistency checks over
54 * structures. these checks slow things down a lot
55 */
56 #define AGGRESSIVE_CHECK__
57
58 /*
59 * with DOUBLE_CHECK defined mballoc creates persistent in-core
60 * bitmaps, maintains and uses them to check for double allocations
61 */
62 #define DOUBLE_CHECK__
63
64 /*
65 * Define EXT4FS_DEBUG to produce debug messages
66 */
67 #undef EXT4FS_DEBUG
68
69 /*
70 * Debug code
71 */
72 #ifdef EXT4FS_DEBUG
73 #define ext4_debug(f, a...) \
74 do { \
75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
76 __FILE__, __LINE__, __func__); \
77 printk(KERN_DEBUG f, ## a); \
78 } while (0)
79 #else
80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
81 #endif
82
83 /*
84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
85 */
86 #define EXT_DEBUG__
87
88 /*
89 * Dynamic printk for controlled extents debugging.
90 */
91 #ifdef CONFIG_EXT4_DEBUG
92 #define ext_debug(ino, fmt, ...) \
93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
94 current->comm, task_pid_nr(current), \
95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
96 __func__, ##__VA_ARGS__)
97 #else
98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
99 #endif
100
101 #define ASSERT(assert) \
102 do { \
103 if (unlikely(!(assert))) { \
104 printk(KERN_EMERG \
105 "Assertion failure in %s() at %s:%d: '%s'\n", \
106 __func__, __FILE__, __LINE__, #assert); \
107 BUG(); \
108 } \
109 } while (0)
110
111 /* data type for block offset of block group */
112 typedef int ext4_grpblk_t;
113
114 /* data type for filesystem-wide blocks number */
115 typedef unsigned long long ext4_fsblk_t;
116
117 /* data type for file logical block number */
118 typedef __u32 ext4_lblk_t;
119
120 /* data type for block group number */
121 typedef unsigned int ext4_group_t;
122
123 enum SHIFT_DIRECTION {
124 SHIFT_LEFT = 0,
125 SHIFT_RIGHT,
126 };
127
128 /*
129 * Flags used in mballoc's allocation_context flags field.
130 *
131 * Also used to show what's going on for debugging purposes when the
132 * flag field is exported via the traceport interface
133 */
134
135 /* prefer goal again. length */
136 #define EXT4_MB_HINT_MERGE 0x0001
137 /* blocks already reserved */
138 #define EXT4_MB_HINT_RESERVED 0x0002
139 /* metadata is being allocated */
140 #define EXT4_MB_HINT_METADATA 0x0004
141 /* first blocks in the file */
142 #define EXT4_MB_HINT_FIRST 0x0008
143 /* search for the best chunk */
144 #define EXT4_MB_HINT_BEST 0x0010
145 /* data is being allocated */
146 #define EXT4_MB_HINT_DATA 0x0020
147 /* don't preallocate (for tails) */
148 #define EXT4_MB_HINT_NOPREALLOC 0x0040
149 /* allocate for locality group */
150 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
151 /* allocate goal blocks or none */
152 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
153 /* goal is meaningful */
154 #define EXT4_MB_HINT_TRY_GOAL 0x0200
155 /* blocks already pre-reserved by delayed allocation */
156 #define EXT4_MB_DELALLOC_RESERVED 0x0400
157 /* We are doing stream allocation */
158 #define EXT4_MB_STREAM_ALLOC 0x0800
159 /* Use reserved root blocks if needed */
160 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
161 /* Use blocks from reserved pool */
162 #define EXT4_MB_USE_RESERVED 0x2000
163 /* Do strict check for free blocks while retrying block allocation */
164 #define EXT4_MB_STRICT_CHECK 0x4000
165
166 struct ext4_allocation_request {
167 /* target inode for block we're allocating */
168 struct inode *inode;
169 /* how many blocks we want to allocate */
170 unsigned int len;
171 /* logical block in target inode */
172 ext4_lblk_t logical;
173 /* the closest logical allocated block to the left */
174 ext4_lblk_t lleft;
175 /* the closest logical allocated block to the right */
176 ext4_lblk_t lright;
177 /* phys. target (a hint) */
178 ext4_fsblk_t goal;
179 /* phys. block for the closest logical allocated block to the left */
180 ext4_fsblk_t pleft;
181 /* phys. block for the closest logical allocated block to the right */
182 ext4_fsblk_t pright;
183 /* flags. see above EXT4_MB_HINT_* */
184 unsigned int flags;
185 };
186
187 /*
188 * Logical to physical block mapping, used by ext4_map_blocks()
189 *
190 * This structure is used to pass requests into ext4_map_blocks() as
191 * well as to store the information returned by ext4_map_blocks(). It
192 * takes less room on the stack than a struct buffer_head.
193 */
194 #define EXT4_MAP_NEW BIT(BH_New)
195 #define EXT4_MAP_MAPPED BIT(BH_Mapped)
196 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
197 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
198 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
199 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
200
201 struct ext4_map_blocks {
202 ext4_fsblk_t m_pblk;
203 ext4_lblk_t m_lblk;
204 unsigned int m_len;
205 unsigned int m_flags;
206 };
207
208 /*
209 * Block validity checking, system zone rbtree.
210 */
211 struct ext4_system_blocks {
212 struct rb_root root;
213 struct rcu_head rcu;
214 };
215
216 /*
217 * Flags for ext4_io_end->flags
218 */
219 #define EXT4_IO_END_UNWRITTEN 0x0001
220
221 struct ext4_io_end_vec {
222 struct list_head list; /* list of io_end_vec */
223 loff_t offset; /* offset in the file */
224 ssize_t size; /* size of the extent */
225 };
226
227 /*
228 * For converting unwritten extents on a work queue. 'handle' is used for
229 * buffered writeback.
230 */
231 typedef struct ext4_io_end {
232 struct list_head list; /* per-file finished IO list */
233 handle_t *handle; /* handle reserved for extent
234 * conversion */
235 struct inode *inode; /* file being written to */
236 struct bio *bio; /* Linked list of completed
237 * bios covering the extent */
238 unsigned int flag; /* unwritten or not */
239 atomic_t count; /* reference counter */
240 struct list_head list_vec; /* list of ext4_io_end_vec */
241 } ext4_io_end_t;
242
243 struct ext4_io_submit {
244 struct writeback_control *io_wbc;
245 struct bio *io_bio;
246 ext4_io_end_t *io_end;
247 sector_t io_next_block;
248 };
249
250 /*
251 * Special inodes numbers
252 */
253 #define EXT4_BAD_INO 1 /* Bad blocks inode */
254 #define EXT4_ROOT_INO 2 /* Root inode */
255 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
256 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
257 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
258 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
259 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
260 #define EXT4_JOURNAL_INO 8 /* Journal inode */
261
262 /* First non-reserved inode for old ext4 filesystems */
263 #define EXT4_GOOD_OLD_FIRST_INO 11
264
265 /*
266 * Maximal count of links to a file
267 */
268 #define EXT4_LINK_MAX 65000
269
270 /*
271 * Macro-instructions used to manage several block sizes
272 */
273 #define EXT4_MIN_BLOCK_SIZE 1024
274 #define EXT4_MAX_BLOCK_SIZE 65536
275 #define EXT4_MIN_BLOCK_LOG_SIZE 10
276 #define EXT4_MAX_BLOCK_LOG_SIZE 16
277 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
278 #ifdef __KERNEL__
279 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
280 #else
281 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
282 #endif
283 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
284 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
285 EXT4_SB(s)->s_cluster_bits)
286 #ifdef __KERNEL__
287 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
288 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
289 #else
290 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
291 #endif
292 #ifdef __KERNEL__
293 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
294 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
295 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
296 #else
297 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
298 EXT4_GOOD_OLD_INODE_SIZE : \
299 (s)->s_inode_size)
300 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
301 EXT4_GOOD_OLD_FIRST_INO : \
302 (s)->s_first_ino)
303 #endif
304 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
305 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
306 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
307 blkbits))
308
309 /* Translate a block number to a cluster number */
310 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
311 /* Translate a cluster number to a block number */
312 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
313 /* Translate # of blks to # of clusters */
314 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
315 (sbi)->s_cluster_bits)
316 /* Mask out the low bits to get the starting block of the cluster */
317 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
318 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
319 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
320 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
321 /* Fill in the low bits to get the last block of the cluster */
322 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
323 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
324 /* Get the cluster offset */
325 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
326 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
327 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
328 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
329
330 /*
331 * Structure of a blocks group descriptor
332 */
333 struct ext4_group_desc
334 {
335 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
336 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
337 __le32 bg_inode_table_lo; /* Inodes table block */
338 __le16 bg_free_blocks_count_lo;/* Free blocks count */
339 __le16 bg_free_inodes_count_lo;/* Free inodes count */
340 __le16 bg_used_dirs_count_lo; /* Directories count */
341 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
342 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
343 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
344 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
345 __le16 bg_itable_unused_lo; /* Unused inodes count */
346 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
347 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
348 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
349 __le32 bg_inode_table_hi; /* Inodes table block MSB */
350 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
351 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
352 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
353 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
354 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
355 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
356 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
357 __u32 bg_reserved;
358 };
359
360 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
361 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
362 sizeof(__le16))
363 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
364 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
365 sizeof(__le16))
366
367 /*
368 * Structure of a flex block group info
369 */
370
371 struct flex_groups {
372 atomic64_t free_clusters;
373 atomic_t free_inodes;
374 atomic_t used_dirs;
375 };
376
377 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
378 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
379 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
380
381 /*
382 * Macro-instructions used to manage group descriptors
383 */
384 #define EXT4_MIN_DESC_SIZE 32
385 #define EXT4_MIN_DESC_SIZE_64BIT 64
386 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
387 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
388 #ifdef __KERNEL__
389 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
390 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
391 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
392 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
393 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
394 #else
395 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
396 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
397 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
398 #endif
399
400 /*
401 * Constants relative to the data blocks
402 */
403 #define EXT4_NDIR_BLOCKS 12
404 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
405 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
406 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
407 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
408
409 /*
410 * Inode flags
411 */
412 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
413 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
414 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
415 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
416 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
417 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
418 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
419 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
420 /* Reserved for compression usage... */
421 #define EXT4_DIRTY_FL 0x00000100
422 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
423 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
424 /* nb: was previously EXT2_ECOMPR_FL */
425 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
426 /* End compression flags --- maybe not all used */
427 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
428 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
429 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
430 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
431 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
432 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
433 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
434 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
435 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
436 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
437 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
438
439 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
440
441 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
442 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
443 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
444 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
445
446 /* User modifiable flags */
447 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
448 EXT4_UNRM_FL | \
449 EXT4_COMPR_FL | \
450 EXT4_SYNC_FL | \
451 EXT4_IMMUTABLE_FL | \
452 EXT4_APPEND_FL | \
453 EXT4_NODUMP_FL | \
454 EXT4_NOATIME_FL | \
455 EXT4_JOURNAL_DATA_FL | \
456 EXT4_NOTAIL_FL | \
457 EXT4_DIRSYNC_FL | \
458 EXT4_TOPDIR_FL | \
459 EXT4_EXTENTS_FL | \
460 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
461 EXT4_DAX_FL | \
462 EXT4_PROJINHERIT_FL | \
463 EXT4_CASEFOLD_FL)
464
465 /* User visible flags */
466 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
467 EXT4_DIRTY_FL | \
468 EXT4_COMPRBLK_FL | \
469 EXT4_NOCOMPR_FL | \
470 EXT4_ENCRYPT_FL | \
471 EXT4_INDEX_FL | \
472 EXT4_VERITY_FL | \
473 EXT4_INLINE_DATA_FL)
474
475 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */
476 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
477 EXT4_IMMUTABLE_FL | \
478 EXT4_APPEND_FL | \
479 EXT4_NODUMP_FL | \
480 EXT4_NOATIME_FL | \
481 EXT4_PROJINHERIT_FL | \
482 EXT4_DAX_FL)
483
484 /* Flags that should be inherited by new inodes from their parent. */
485 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
486 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
487 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
488 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
489 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
490 EXT4_DAX_FL)
491
492 /* Flags that are appropriate for regular files (all but dir-specific ones). */
493 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
494 EXT4_PROJINHERIT_FL))
495
496 /* Flags that are appropriate for non-directories/regular files. */
497 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
498
499 /* The only flags that should be swapped */
500 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
501
502 /* Flags which are mutually exclusive to DAX */
503 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
504 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
505
506 /* Mask out flags that are inappropriate for the given type of inode. */
507 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
508 {
509 if (S_ISDIR(mode))
510 return flags;
511 else if (S_ISREG(mode))
512 return flags & EXT4_REG_FLMASK;
513 else
514 return flags & EXT4_OTHER_FLMASK;
515 }
516
517 /*
518 * Inode flags used for atomic set/get
519 */
520 enum {
521 EXT4_INODE_SECRM = 0, /* Secure deletion */
522 EXT4_INODE_UNRM = 1, /* Undelete */
523 EXT4_INODE_COMPR = 2, /* Compress file */
524 EXT4_INODE_SYNC = 3, /* Synchronous updates */
525 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
526 EXT4_INODE_APPEND = 5, /* writes to file may only append */
527 EXT4_INODE_NODUMP = 6, /* do not dump file */
528 EXT4_INODE_NOATIME = 7, /* do not update atime */
529 /* Reserved for compression usage... */
530 EXT4_INODE_DIRTY = 8,
531 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
532 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
533 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
534 /* End compression flags --- maybe not all used */
535 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
536 EXT4_INODE_IMAGIC = 13, /* AFS directory */
537 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
538 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
539 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
540 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
541 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
542 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
543 EXT4_INODE_VERITY = 20, /* Verity protected inode */
544 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
545 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
546 EXT4_INODE_DAX = 25, /* Inode is DAX */
547 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
548 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
549 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
550 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
551 };
552
553 /*
554 * Since it's pretty easy to mix up bit numbers and hex values, we use a
555 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
556 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
557 * any extra space in the compiled kernel image, otherwise, the build will fail.
558 * It's important that these values are the same, since we are using
559 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
560 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
561 * values found in ext2, ext3 and ext4 filesystems, and of course the values
562 * defined in e2fsprogs.
563 *
564 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
565 */
566 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
567 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
568
569 static inline void ext4_check_flag_values(void)
570 {
571 CHECK_FLAG_VALUE(SECRM);
572 CHECK_FLAG_VALUE(UNRM);
573 CHECK_FLAG_VALUE(COMPR);
574 CHECK_FLAG_VALUE(SYNC);
575 CHECK_FLAG_VALUE(IMMUTABLE);
576 CHECK_FLAG_VALUE(APPEND);
577 CHECK_FLAG_VALUE(NODUMP);
578 CHECK_FLAG_VALUE(NOATIME);
579 CHECK_FLAG_VALUE(DIRTY);
580 CHECK_FLAG_VALUE(COMPRBLK);
581 CHECK_FLAG_VALUE(NOCOMPR);
582 CHECK_FLAG_VALUE(ENCRYPT);
583 CHECK_FLAG_VALUE(INDEX);
584 CHECK_FLAG_VALUE(IMAGIC);
585 CHECK_FLAG_VALUE(JOURNAL_DATA);
586 CHECK_FLAG_VALUE(NOTAIL);
587 CHECK_FLAG_VALUE(DIRSYNC);
588 CHECK_FLAG_VALUE(TOPDIR);
589 CHECK_FLAG_VALUE(HUGE_FILE);
590 CHECK_FLAG_VALUE(EXTENTS);
591 CHECK_FLAG_VALUE(VERITY);
592 CHECK_FLAG_VALUE(EA_INODE);
593 CHECK_FLAG_VALUE(INLINE_DATA);
594 CHECK_FLAG_VALUE(PROJINHERIT);
595 CHECK_FLAG_VALUE(CASEFOLD);
596 CHECK_FLAG_VALUE(RESERVED);
597 }
598
599 /* Used to pass group descriptor data when online resize is done */
600 struct ext4_new_group_input {
601 __u32 group; /* Group number for this data */
602 __u64 block_bitmap; /* Absolute block number of block bitmap */
603 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
604 __u64 inode_table; /* Absolute block number of inode table start */
605 __u32 blocks_count; /* Total number of blocks in this group */
606 __u16 reserved_blocks; /* Number of reserved blocks in this group */
607 __u16 unused;
608 };
609
610 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
611 struct compat_ext4_new_group_input {
612 u32 group;
613 compat_u64 block_bitmap;
614 compat_u64 inode_bitmap;
615 compat_u64 inode_table;
616 u32 blocks_count;
617 u16 reserved_blocks;
618 u16 unused;
619 };
620 #endif
621
622 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
623 struct ext4_new_group_data {
624 __u32 group;
625 __u64 block_bitmap;
626 __u64 inode_bitmap;
627 __u64 inode_table;
628 __u32 blocks_count;
629 __u16 reserved_blocks;
630 __u16 mdata_blocks;
631 __u32 free_clusters_count;
632 };
633
634 /* Indexes used to index group tables in ext4_new_group_data */
635 enum {
636 BLOCK_BITMAP = 0, /* block bitmap */
637 INODE_BITMAP, /* inode bitmap */
638 INODE_TABLE, /* inode tables */
639 GROUP_TABLE_COUNT,
640 };
641
642 /*
643 * Flags used by ext4_map_blocks()
644 */
645 /* Allocate any needed blocks and/or convert an unwritten
646 extent to be an initialized ext4 */
647 #define EXT4_GET_BLOCKS_CREATE 0x0001
648 /* Request the creation of an unwritten extent */
649 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
650 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
651 EXT4_GET_BLOCKS_CREATE)
652 /* Caller is from the delayed allocation writeout path
653 * finally doing the actual allocation of delayed blocks */
654 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
655 /* caller is from the direct IO path, request to creation of an
656 unwritten extents if not allocated, split the unwritten
657 extent if blocks has been preallocated already*/
658 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
659 #define EXT4_GET_BLOCKS_CONVERT 0x0010
660 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
661 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
662 /* Convert extent to initialized after IO complete */
663 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
664 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
665 /* Eventual metadata allocation (due to growing extent tree)
666 * should not fail, so try to use reserved blocks for that.*/
667 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
668 /* Don't normalize allocation size (used for fallocate) */
669 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
670 /* Convert written extents to unwritten */
671 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
672 /* Write zeros to newly created written extents */
673 #define EXT4_GET_BLOCKS_ZERO 0x0200
674 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
675 EXT4_GET_BLOCKS_ZERO)
676 /* Caller will submit data before dropping transaction handle. This
677 * allows jbd2 to avoid submitting data before commit. */
678 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
679
680 /*
681 * The bit position of these flags must not overlap with any of the
682 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
683 * read_extent_tree_block(), ext4_split_extent_at(),
684 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
685 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
686 * caching the extents when reading from the extent tree while a
687 * truncate or punch hole operation is in progress.
688 */
689 #define EXT4_EX_NOCACHE 0x40000000
690 #define EXT4_EX_FORCE_CACHE 0x20000000
691 #define EXT4_EX_NOFAIL 0x10000000
692
693 /*
694 * Flags used by ext4_free_blocks
695 */
696 #define EXT4_FREE_BLOCKS_METADATA 0x0001
697 #define EXT4_FREE_BLOCKS_FORGET 0x0002
698 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
699 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
700 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
701 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
702 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
703
704 /*
705 * ioctl commands
706 */
707 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
708 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
709 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
710 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
711 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
712 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
713 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
714 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
715 #define EXT4_IOC_MIGRATE _IO('f', 9)
716 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
717 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
718 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
719 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
720 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
721 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
722 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
723 /* ioctl codes 19--39 are reserved for fscrypt */
724 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
725 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
726 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
727
728 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
729
730 /*
731 * Flags for going down operation
732 */
733 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
734 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
735 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
736
737 /*
738 * Flags returned by EXT4_IOC_GETSTATE
739 *
740 * We only expose to userspace a subset of the state flags in
741 * i_state_flags
742 */
743 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
744 #define EXT4_STATE_FLAG_NEW 0x00000002
745 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004
746 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
747
748 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
749 /*
750 * ioctl commands in 32 bit emulation
751 */
752 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
753 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
754 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
755 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
756 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
757 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
758 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
759 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
760 #endif
761
762 /*
763 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
764 * It indicates that the entry in extent status cache is for a hole.
765 */
766 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
767
768 /* Max physical block we can address w/o extents */
769 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
770
771 /* Max logical block we can support */
772 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
773
774 /*
775 * Structure of an inode on the disk
776 */
777 struct ext4_inode {
778 __le16 i_mode; /* File mode */
779 __le16 i_uid; /* Low 16 bits of Owner Uid */
780 __le32 i_size_lo; /* Size in bytes */
781 __le32 i_atime; /* Access time */
782 __le32 i_ctime; /* Inode Change time */
783 __le32 i_mtime; /* Modification time */
784 __le32 i_dtime; /* Deletion Time */
785 __le16 i_gid; /* Low 16 bits of Group Id */
786 __le16 i_links_count; /* Links count */
787 __le32 i_blocks_lo; /* Blocks count */
788 __le32 i_flags; /* File flags */
789 union {
790 struct {
791 __le32 l_i_version;
792 } linux1;
793 struct {
794 __u32 h_i_translator;
795 } hurd1;
796 struct {
797 __u32 m_i_reserved1;
798 } masix1;
799 } osd1; /* OS dependent 1 */
800 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
801 __le32 i_generation; /* File version (for NFS) */
802 __le32 i_file_acl_lo; /* File ACL */
803 __le32 i_size_high;
804 __le32 i_obso_faddr; /* Obsoleted fragment address */
805 union {
806 struct {
807 __le16 l_i_blocks_high; /* were l_i_reserved1 */
808 __le16 l_i_file_acl_high;
809 __le16 l_i_uid_high; /* these 2 fields */
810 __le16 l_i_gid_high; /* were reserved2[0] */
811 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
812 __le16 l_i_reserved;
813 } linux2;
814 struct {
815 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
816 __u16 h_i_mode_high;
817 __u16 h_i_uid_high;
818 __u16 h_i_gid_high;
819 __u32 h_i_author;
820 } hurd2;
821 struct {
822 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
823 __le16 m_i_file_acl_high;
824 __u32 m_i_reserved2[2];
825 } masix2;
826 } osd2; /* OS dependent 2 */
827 __le16 i_extra_isize;
828 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
829 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
830 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
831 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
832 __le32 i_crtime; /* File Creation time */
833 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
834 __le32 i_version_hi; /* high 32 bits for 64-bit version */
835 __le32 i_projid; /* Project ID */
836 };
837
838 struct move_extent {
839 __u32 reserved; /* should be zero */
840 __u32 donor_fd; /* donor file descriptor */
841 __u64 orig_start; /* logical start offset in block for orig */
842 __u64 donor_start; /* logical start offset in block for donor */
843 __u64 len; /* block length to be moved */
844 __u64 moved_len; /* moved block length */
845 };
846
847 #define EXT4_EPOCH_BITS 2
848 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
849 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
850
851 /*
852 * Extended fields will fit into an inode if the filesystem was formatted
853 * with large inodes (-I 256 or larger) and there are not currently any EAs
854 * consuming all of the available space. For new inodes we always reserve
855 * enough space for the kernel's known extended fields, but for inodes
856 * created with an old kernel this might not have been the case. None of
857 * the extended inode fields is critical for correct filesystem operation.
858 * This macro checks if a certain field fits in the inode. Note that
859 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
860 */
861 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
862 ((offsetof(typeof(*ext4_inode), field) + \
863 sizeof((ext4_inode)->field)) \
864 <= (EXT4_GOOD_OLD_INODE_SIZE + \
865 (einode)->i_extra_isize)) \
866
867 /*
868 * We use an encoding that preserves the times for extra epoch "00":
869 *
870 * extra msb of adjust for signed
871 * epoch 32-bit 32-bit tv_sec to
872 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
873 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
874 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
875 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
876 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
877 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
878 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
879 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
880 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
881 *
882 * Note that previous versions of the kernel on 64-bit systems would
883 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
884 * 1970. e2fsck will correct this, assuming that it is run on the
885 * affected filesystem before 2242.
886 */
887
888 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
889 {
890 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
891 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
892 }
893
894 static inline void ext4_decode_extra_time(struct timespec64 *time,
895 __le32 extra)
896 {
897 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
898 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
899 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
900 }
901
902 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
903 do { \
904 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
905 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
906 (raw_inode)->xtime ## _extra = \
907 ext4_encode_extra_time(&(inode)->xtime); \
908 } \
909 else \
910 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
911 } while (0)
912
913 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
914 do { \
915 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
916 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
917 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
918 (raw_inode)->xtime ## _extra = \
919 ext4_encode_extra_time(&(einode)->xtime); \
920 } while (0)
921
922 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
923 do { \
924 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
925 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
926 ext4_decode_extra_time(&(inode)->xtime, \
927 raw_inode->xtime ## _extra); \
928 } \
929 else \
930 (inode)->xtime.tv_nsec = 0; \
931 } while (0)
932
933
934 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
935 do { \
936 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
937 (einode)->xtime.tv_sec = \
938 (signed)le32_to_cpu((raw_inode)->xtime); \
939 else \
940 (einode)->xtime.tv_sec = 0; \
941 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
942 ext4_decode_extra_time(&(einode)->xtime, \
943 raw_inode->xtime ## _extra); \
944 else \
945 (einode)->xtime.tv_nsec = 0; \
946 } while (0)
947
948 #define i_disk_version osd1.linux1.l_i_version
949
950 #if defined(__KERNEL__) || defined(__linux__)
951 #define i_reserved1 osd1.linux1.l_i_reserved1
952 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
953 #define i_blocks_high osd2.linux2.l_i_blocks_high
954 #define i_uid_low i_uid
955 #define i_gid_low i_gid
956 #define i_uid_high osd2.linux2.l_i_uid_high
957 #define i_gid_high osd2.linux2.l_i_gid_high
958 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
959
960 #elif defined(__GNU__)
961
962 #define i_translator osd1.hurd1.h_i_translator
963 #define i_uid_high osd2.hurd2.h_i_uid_high
964 #define i_gid_high osd2.hurd2.h_i_gid_high
965 #define i_author osd2.hurd2.h_i_author
966
967 #elif defined(__masix__)
968
969 #define i_reserved1 osd1.masix1.m_i_reserved1
970 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
971 #define i_reserved2 osd2.masix2.m_i_reserved2
972
973 #endif /* defined(__KERNEL__) || defined(__linux__) */
974
975 #include "extents_status.h"
976 #include "fast_commit.h"
977
978 /*
979 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
980 *
981 * These are needed to avoid lockdep false positives when we need to
982 * allocate blocks to the quota inode during ext4_map_blocks(), while
983 * holding i_data_sem for a normal (non-quota) inode. Since we don't
984 * do quota tracking for the quota inode, this avoids deadlock (as
985 * well as infinite recursion, since it isn't turtles all the way
986 * down...)
987 *
988 * I_DATA_SEM_NORMAL - Used for most inodes
989 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
990 * where the second inode has larger inode number
991 * than the first
992 * I_DATA_SEM_QUOTA - Used for quota inodes only
993 */
994 enum {
995 I_DATA_SEM_NORMAL = 0,
996 I_DATA_SEM_OTHER,
997 I_DATA_SEM_QUOTA,
998 };
999
1000
1001 /*
1002 * fourth extended file system inode data in memory
1003 */
1004 struct ext4_inode_info {
1005 __le32 i_data[15]; /* unconverted */
1006 __u32 i_dtime;
1007 ext4_fsblk_t i_file_acl;
1008
1009 /*
1010 * i_block_group is the number of the block group which contains
1011 * this file's inode. Constant across the lifetime of the inode,
1012 * it is used for making block allocation decisions - we try to
1013 * place a file's data blocks near its inode block, and new inodes
1014 * near to their parent directory's inode.
1015 */
1016 ext4_group_t i_block_group;
1017 ext4_lblk_t i_dir_start_lookup;
1018 #if (BITS_PER_LONG < 64)
1019 unsigned long i_state_flags; /* Dynamic state flags */
1020 #endif
1021 unsigned long i_flags;
1022
1023 /*
1024 * Extended attributes can be read independently of the main file
1025 * data. Taking i_mutex even when reading would cause contention
1026 * between readers of EAs and writers of regular file data, so
1027 * instead we synchronize on xattr_sem when reading or changing
1028 * EAs.
1029 */
1030 struct rw_semaphore xattr_sem;
1031
1032 struct list_head i_orphan; /* unlinked but open inodes */
1033
1034 /* Fast commit related info */
1035
1036 struct list_head i_fc_list; /*
1037 * inodes that need fast commit
1038 * protected by sbi->s_fc_lock.
1039 */
1040
1041 /* Start of lblk range that needs to be committed in this fast commit */
1042 ext4_lblk_t i_fc_lblk_start;
1043
1044 /* End of lblk range that needs to be committed in this fast commit */
1045 ext4_lblk_t i_fc_lblk_len;
1046
1047 /* Number of ongoing updates on this inode */
1048 atomic_t i_fc_updates;
1049
1050 /* Fast commit wait queue for this inode */
1051 wait_queue_head_t i_fc_wait;
1052
1053 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1054 struct mutex i_fc_lock;
1055
1056 /*
1057 * i_disksize keeps track of what the inode size is ON DISK, not
1058 * in memory. During truncate, i_size is set to the new size by
1059 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1060 * set i_disksize to 0 until the truncate is actually under way.
1061 *
1062 * The intent is that i_disksize always represents the blocks which
1063 * are used by this file. This allows recovery to restart truncate
1064 * on orphans if we crash during truncate. We actually write i_disksize
1065 * into the on-disk inode when writing inodes out, instead of i_size.
1066 *
1067 * The only time when i_disksize and i_size may be different is when
1068 * a truncate is in progress. The only things which change i_disksize
1069 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1070 */
1071 loff_t i_disksize;
1072
1073 /*
1074 * i_data_sem is for serialising ext4_truncate() against
1075 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1076 * data tree are chopped off during truncate. We can't do that in
1077 * ext4 because whenever we perform intermediate commits during
1078 * truncate, the inode and all the metadata blocks *must* be in a
1079 * consistent state which allows truncation of the orphans to restart
1080 * during recovery. Hence we must fix the get_block-vs-truncate race
1081 * by other means, so we have i_data_sem.
1082 */
1083 struct rw_semaphore i_data_sem;
1084 /*
1085 * i_mmap_sem is for serializing page faults with truncate / punch hole
1086 * operations. We have to make sure that new page cannot be faulted in
1087 * a section of the inode that is being punched. We cannot easily use
1088 * i_data_sem for this since we need protection for the whole punch
1089 * operation and i_data_sem ranks below transaction start so we have
1090 * to occasionally drop it.
1091 */
1092 struct rw_semaphore i_mmap_sem;
1093 struct inode vfs_inode;
1094 struct jbd2_inode *jinode;
1095
1096 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1097
1098 /*
1099 * File creation time. Its function is same as that of
1100 * struct timespec64 i_{a,c,m}time in the generic inode.
1101 */
1102 struct timespec64 i_crtime;
1103
1104 /* mballoc */
1105 atomic_t i_prealloc_active;
1106 struct list_head i_prealloc_list;
1107 spinlock_t i_prealloc_lock;
1108
1109 /* extents status tree */
1110 struct ext4_es_tree i_es_tree;
1111 rwlock_t i_es_lock;
1112 struct list_head i_es_list;
1113 unsigned int i_es_all_nr; /* protected by i_es_lock */
1114 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1115 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1116 extents to shrink. Protected by
1117 i_es_lock */
1118
1119 /* ialloc */
1120 ext4_group_t i_last_alloc_group;
1121
1122 /* allocation reservation info for delalloc */
1123 /* In case of bigalloc, this refer to clusters rather than blocks */
1124 unsigned int i_reserved_data_blocks;
1125
1126 /* pending cluster reservations for bigalloc file systems */
1127 struct ext4_pending_tree i_pending_tree;
1128
1129 /* on-disk additional length */
1130 __u16 i_extra_isize;
1131
1132 /* Indicate the inline data space. */
1133 u16 i_inline_off;
1134 u16 i_inline_size;
1135
1136 #ifdef CONFIG_QUOTA
1137 /* quota space reservation, managed internally by quota code */
1138 qsize_t i_reserved_quota;
1139 #endif
1140
1141 /* Lock protecting lists below */
1142 spinlock_t i_completed_io_lock;
1143 /*
1144 * Completed IOs that need unwritten extents handling and have
1145 * transaction reserved
1146 */
1147 struct list_head i_rsv_conversion_list;
1148 struct work_struct i_rsv_conversion_work;
1149 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1150
1151 spinlock_t i_block_reservation_lock;
1152
1153 /*
1154 * Transactions that contain inode's metadata needed to complete
1155 * fsync and fdatasync, respectively.
1156 */
1157 tid_t i_sync_tid;
1158 tid_t i_datasync_tid;
1159
1160 #ifdef CONFIG_QUOTA
1161 struct dquot *i_dquot[MAXQUOTAS];
1162 #endif
1163
1164 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1165 __u32 i_csum_seed;
1166
1167 kprojid_t i_projid;
1168 };
1169
1170 /*
1171 * File system states
1172 */
1173 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1174 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1175 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1176 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1177
1178 /*
1179 * Misc. filesystem flags
1180 */
1181 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1182 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1183 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1184
1185 /*
1186 * Mount flags set via mount options or defaults
1187 */
1188 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1189 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1190 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1191 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1192 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1193 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1194 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1195 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1196 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1197 #ifdef CONFIG_FS_DAX
1198 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1199 #else
1200 #define EXT4_MOUNT_DAX_ALWAYS 0
1201 #endif
1202 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1203 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1204 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1205 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1206 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1207 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1208 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1209 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1210 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1211 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1212 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1213 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1214 * enable enforcement for hidden
1215 * quota files */
1216 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1217 * enforcement for hidden quota
1218 * files */
1219 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1220 * enforcement */
1221 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1222 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1223 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1224 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1225 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
1226 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1227 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1228 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1229 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1230 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1231
1232 /*
1233 * Mount flags set either automatically (could not be set by mount option)
1234 * based on per file system feature or property or in special cases such as
1235 * distinguishing between explicit mount option definition and default.
1236 */
1237 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1238 specified delalloc */
1239 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1240 size of blocksize * 8
1241 blocks */
1242 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1243 file systems */
1244 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1245 specified journal checksum */
1246
1247 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1248 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1249 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1250
1251
1252 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1253 ~EXT4_MOUNT_##opt
1254 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1255 EXT4_MOUNT_##opt
1256 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1257 EXT4_MOUNT_##opt)
1258
1259 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1260 ~EXT4_MOUNT2_##opt
1261 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1262 EXT4_MOUNT2_##opt
1263 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1264 EXT4_MOUNT2_##opt)
1265
1266 #define ext4_test_and_set_bit __test_and_set_bit_le
1267 #define ext4_set_bit __set_bit_le
1268 #define ext4_set_bit_atomic ext2_set_bit_atomic
1269 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1270 #define ext4_clear_bit __clear_bit_le
1271 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1272 #define ext4_test_bit test_bit_le
1273 #define ext4_find_next_zero_bit find_next_zero_bit_le
1274 #define ext4_find_next_bit find_next_bit_le
1275
1276 extern void ext4_set_bits(void *bm, int cur, int len);
1277
1278 /*
1279 * Maximal mount counts between two filesystem checks
1280 */
1281 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1282 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1283
1284 /*
1285 * Behaviour when detecting errors
1286 */
1287 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1288 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1289 #define EXT4_ERRORS_PANIC 3 /* Panic */
1290 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1291
1292 /* Metadata checksum algorithm codes */
1293 #define EXT4_CRC32C_CHKSUM 1
1294
1295 /*
1296 * Structure of the super block
1297 */
1298 struct ext4_super_block {
1299 /*00*/ __le32 s_inodes_count; /* Inodes count */
1300 __le32 s_blocks_count_lo; /* Blocks count */
1301 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1302 __le32 s_free_blocks_count_lo; /* Free blocks count */
1303 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1304 __le32 s_first_data_block; /* First Data Block */
1305 __le32 s_log_block_size; /* Block size */
1306 __le32 s_log_cluster_size; /* Allocation cluster size */
1307 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1308 __le32 s_clusters_per_group; /* # Clusters per group */
1309 __le32 s_inodes_per_group; /* # Inodes per group */
1310 __le32 s_mtime; /* Mount time */
1311 /*30*/ __le32 s_wtime; /* Write time */
1312 __le16 s_mnt_count; /* Mount count */
1313 __le16 s_max_mnt_count; /* Maximal mount count */
1314 __le16 s_magic; /* Magic signature */
1315 __le16 s_state; /* File system state */
1316 __le16 s_errors; /* Behaviour when detecting errors */
1317 __le16 s_minor_rev_level; /* minor revision level */
1318 /*40*/ __le32 s_lastcheck; /* time of last check */
1319 __le32 s_checkinterval; /* max. time between checks */
1320 __le32 s_creator_os; /* OS */
1321 __le32 s_rev_level; /* Revision level */
1322 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1323 __le16 s_def_resgid; /* Default gid for reserved blocks */
1324 /*
1325 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1326 *
1327 * Note: the difference between the compatible feature set and
1328 * the incompatible feature set is that if there is a bit set
1329 * in the incompatible feature set that the kernel doesn't
1330 * know about, it should refuse to mount the filesystem.
1331 *
1332 * e2fsck's requirements are more strict; if it doesn't know
1333 * about a feature in either the compatible or incompatible
1334 * feature set, it must abort and not try to meddle with
1335 * things it doesn't understand...
1336 */
1337 __le32 s_first_ino; /* First non-reserved inode */
1338 __le16 s_inode_size; /* size of inode structure */
1339 __le16 s_block_group_nr; /* block group # of this superblock */
1340 __le32 s_feature_compat; /* compatible feature set */
1341 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1342 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1343 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1344 /*78*/ char s_volume_name[16]; /* volume name */
1345 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1346 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1347 /*
1348 * Performance hints. Directory preallocation should only
1349 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1350 */
1351 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1352 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1353 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1354 /*
1355 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1356 */
1357 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1358 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1359 __le32 s_journal_dev; /* device number of journal file */
1360 __le32 s_last_orphan; /* start of list of inodes to delete */
1361 __le32 s_hash_seed[4]; /* HTREE hash seed */
1362 __u8 s_def_hash_version; /* Default hash version to use */
1363 __u8 s_jnl_backup_type;
1364 __le16 s_desc_size; /* size of group descriptor */
1365 /*100*/ __le32 s_default_mount_opts;
1366 __le32 s_first_meta_bg; /* First metablock block group */
1367 __le32 s_mkfs_time; /* When the filesystem was created */
1368 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1369 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1370 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1371 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1372 __le32 s_free_blocks_count_hi; /* Free blocks count */
1373 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1374 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1375 __le32 s_flags; /* Miscellaneous flags */
1376 __le16 s_raid_stride; /* RAID stride */
1377 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1378 __le64 s_mmp_block; /* Block for multi-mount protection */
1379 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1380 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1381 __u8 s_checksum_type; /* metadata checksum algorithm used */
1382 __u8 s_encryption_level; /* versioning level for encryption */
1383 __u8 s_reserved_pad; /* Padding to next 32bits */
1384 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1385 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1386 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1387 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1388 snapshot's future use */
1389 __le32 s_snapshot_list; /* inode number of the head of the
1390 on-disk snapshot list */
1391 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1392 __le32 s_error_count; /* number of fs errors */
1393 __le32 s_first_error_time; /* first time an error happened */
1394 __le32 s_first_error_ino; /* inode involved in first error */
1395 __le64 s_first_error_block; /* block involved of first error */
1396 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1397 __le32 s_first_error_line; /* line number where error happened */
1398 __le32 s_last_error_time; /* most recent time of an error */
1399 __le32 s_last_error_ino; /* inode involved in last error */
1400 __le32 s_last_error_line; /* line number where error happened */
1401 __le64 s_last_error_block; /* block involved of last error */
1402 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1403 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1404 __u8 s_mount_opts[64];
1405 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1406 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1407 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1408 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1409 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1410 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1411 __le32 s_lpf_ino; /* Location of the lost+found inode */
1412 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1413 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1414 __u8 s_wtime_hi;
1415 __u8 s_mtime_hi;
1416 __u8 s_mkfs_time_hi;
1417 __u8 s_lastcheck_hi;
1418 __u8 s_first_error_time_hi;
1419 __u8 s_last_error_time_hi;
1420 __u8 s_first_error_errcode;
1421 __u8 s_last_error_errcode;
1422 __le16 s_encoding; /* Filename charset encoding */
1423 __le16 s_encoding_flags; /* Filename charset encoding flags */
1424 __le32 s_reserved[95]; /* Padding to the end of the block */
1425 __le32 s_checksum; /* crc32c(superblock) */
1426 };
1427
1428 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1429
1430 #ifdef __KERNEL__
1431
1432 #ifdef CONFIG_FS_ENCRYPTION
1433 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_policy.policy != NULL)
1434 #else
1435 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1436 #endif
1437
1438 /* Number of quota types we support */
1439 #define EXT4_MAXQUOTAS 3
1440
1441 #define EXT4_ENC_UTF8_12_1 1
1442
1443 /*
1444 * fourth extended-fs super-block data in memory
1445 */
1446 struct ext4_sb_info {
1447 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1448 unsigned long s_inodes_per_block;/* Number of inodes per block */
1449 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1450 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1451 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1452 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1453 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1454 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1455 ext4_group_t s_groups_count; /* Number of groups in the fs */
1456 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1457 unsigned long s_overhead; /* # of fs overhead clusters */
1458 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1459 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1460 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1461 struct buffer_head * s_sbh; /* Buffer containing the super block */
1462 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1463 struct buffer_head * __rcu *s_group_desc;
1464 unsigned int s_mount_opt;
1465 unsigned int s_mount_opt2;
1466 unsigned long s_mount_flags;
1467 unsigned int s_def_mount_opt;
1468 ext4_fsblk_t s_sb_block;
1469 atomic64_t s_resv_clusters;
1470 kuid_t s_resuid;
1471 kgid_t s_resgid;
1472 unsigned short s_mount_state;
1473 unsigned short s_pad;
1474 int s_addr_per_block_bits;
1475 int s_desc_per_block_bits;
1476 int s_inode_size;
1477 int s_first_ino;
1478 unsigned int s_inode_readahead_blks;
1479 unsigned int s_inode_goal;
1480 u32 s_hash_seed[4];
1481 int s_def_hash_version;
1482 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1483 struct percpu_counter s_freeclusters_counter;
1484 struct percpu_counter s_freeinodes_counter;
1485 struct percpu_counter s_dirs_counter;
1486 struct percpu_counter s_dirtyclusters_counter;
1487 struct blockgroup_lock *s_blockgroup_lock;
1488 struct proc_dir_entry *s_proc;
1489 struct kobject s_kobj;
1490 struct completion s_kobj_unregister;
1491 struct super_block *s_sb;
1492
1493 /* Journaling */
1494 struct journal_s *s_journal;
1495 struct list_head s_orphan;
1496 struct mutex s_orphan_lock;
1497 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1498 unsigned long s_commit_interval;
1499 u32 s_max_batch_time;
1500 u32 s_min_batch_time;
1501 struct block_device *s_journal_bdev;
1502 #ifdef CONFIG_QUOTA
1503 /* Names of quota files with journalled quota */
1504 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1505 int s_jquota_fmt; /* Format of quota to use */
1506 #endif
1507 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1508 struct ext4_system_blocks __rcu *s_system_blks;
1509
1510 #ifdef EXTENTS_STATS
1511 /* ext4 extents stats */
1512 unsigned long s_ext_min;
1513 unsigned long s_ext_max;
1514 unsigned long s_depth_max;
1515 spinlock_t s_ext_stats_lock;
1516 unsigned long s_ext_blocks;
1517 unsigned long s_ext_extents;
1518 #endif
1519
1520 /* for buddy allocator */
1521 struct ext4_group_info ** __rcu *s_group_info;
1522 struct inode *s_buddy_cache;
1523 spinlock_t s_md_lock;
1524 unsigned short *s_mb_offsets;
1525 unsigned int *s_mb_maxs;
1526 unsigned int s_group_info_size;
1527 unsigned int s_mb_free_pending;
1528 struct list_head s_freed_data_list; /* List of blocks to be freed
1529 after commit completed */
1530
1531 /* tunables */
1532 unsigned long s_stripe;
1533 unsigned int s_mb_stream_request;
1534 unsigned int s_mb_max_to_scan;
1535 unsigned int s_mb_min_to_scan;
1536 unsigned int s_mb_stats;
1537 unsigned int s_mb_order2_reqs;
1538 unsigned int s_mb_group_prealloc;
1539 unsigned int s_mb_max_inode_prealloc;
1540 unsigned int s_max_dir_size_kb;
1541 /* where last allocation was done - for stream allocation */
1542 unsigned long s_mb_last_group;
1543 unsigned long s_mb_last_start;
1544 unsigned int s_mb_prefetch;
1545 unsigned int s_mb_prefetch_limit;
1546
1547 /* stats for buddy allocator */
1548 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1549 atomic_t s_bal_success; /* we found long enough chunks */
1550 atomic_t s_bal_allocated; /* in blocks */
1551 atomic_t s_bal_ex_scanned; /* total extents scanned */
1552 atomic_t s_bal_goals; /* goal hits */
1553 atomic_t s_bal_breaks; /* too long searches */
1554 atomic_t s_bal_2orders; /* 2^order hits */
1555 spinlock_t s_bal_lock;
1556 unsigned long s_mb_buddies_generated;
1557 unsigned long long s_mb_generation_time;
1558 atomic_t s_mb_lost_chunks;
1559 atomic_t s_mb_preallocated;
1560 atomic_t s_mb_discarded;
1561 atomic_t s_lock_busy;
1562
1563 /* locality groups */
1564 struct ext4_locality_group __percpu *s_locality_groups;
1565
1566 /* for write statistics */
1567 unsigned long s_sectors_written_start;
1568 u64 s_kbytes_written;
1569
1570 /* the size of zero-out chunk */
1571 unsigned int s_extent_max_zeroout_kb;
1572
1573 unsigned int s_log_groups_per_flex;
1574 struct flex_groups * __rcu *s_flex_groups;
1575 ext4_group_t s_flex_groups_allocated;
1576
1577 /* workqueue for reserved extent conversions (buffered io) */
1578 struct workqueue_struct *rsv_conversion_wq;
1579
1580 /* timer for periodic error stats printing */
1581 struct timer_list s_err_report;
1582
1583 /* Lazy inode table initialization info */
1584 struct ext4_li_request *s_li_request;
1585 /* Wait multiplier for lazy initialization thread */
1586 unsigned int s_li_wait_mult;
1587
1588 /* Kernel thread for multiple mount protection */
1589 struct task_struct *s_mmp_tsk;
1590
1591 /* record the last minlen when FITRIM is called. */
1592 atomic_t s_last_trim_minblks;
1593
1594 /* Reference to checksum algorithm driver via cryptoapi */
1595 struct crypto_shash *s_chksum_driver;
1596
1597 /* Precomputed FS UUID checksum for seeding other checksums */
1598 __u32 s_csum_seed;
1599
1600 /* Reclaim extents from extent status tree */
1601 struct shrinker s_es_shrinker;
1602 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1603 long s_es_nr_inode;
1604 struct ext4_es_stats s_es_stats;
1605 struct mb_cache *s_ea_block_cache;
1606 struct mb_cache *s_ea_inode_cache;
1607 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1608
1609 /* Ratelimit ext4 messages. */
1610 struct ratelimit_state s_err_ratelimit_state;
1611 struct ratelimit_state s_warning_ratelimit_state;
1612 struct ratelimit_state s_msg_ratelimit_state;
1613 atomic_t s_warning_count;
1614 atomic_t s_msg_count;
1615
1616 /* Encryption policy for '-o test_dummy_encryption' */
1617 struct fscrypt_dummy_policy s_dummy_enc_policy;
1618
1619 /*
1620 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1621 * or EXTENTS flag.
1622 */
1623 struct percpu_rw_semaphore s_writepages_rwsem;
1624 struct dax_device *s_daxdev;
1625 #ifdef CONFIG_EXT4_DEBUG
1626 unsigned long s_simulate_fail;
1627 #endif
1628 /* Record the errseq of the backing block device */
1629 errseq_t s_bdev_wb_err;
1630 spinlock_t s_bdev_wb_lock;
1631
1632 /* Information about errors that happened during this mount */
1633 spinlock_t s_error_lock;
1634 int s_add_error_count;
1635 int s_first_error_code;
1636 __u32 s_first_error_line;
1637 __u32 s_first_error_ino;
1638 __u64 s_first_error_block;
1639 const char *s_first_error_func;
1640 time64_t s_first_error_time;
1641 int s_last_error_code;
1642 __u32 s_last_error_line;
1643 __u32 s_last_error_ino;
1644 __u64 s_last_error_block;
1645 const char *s_last_error_func;
1646 time64_t s_last_error_time;
1647 /*
1648 * If we are in a context where we cannot update error information in
1649 * the on-disk superblock, we queue this work to do it.
1650 */
1651 struct work_struct s_error_work;
1652
1653 /* Ext4 fast commit stuff */
1654 atomic_t s_fc_subtid;
1655 atomic_t s_fc_ineligible_updates;
1656 /*
1657 * After commit starts, the main queue gets locked, and the further
1658 * updates get added in the staging queue.
1659 */
1660 #define FC_Q_MAIN 0
1661 #define FC_Q_STAGING 1
1662 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1663 * that have data changes in them.
1664 */
1665 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1666 unsigned int s_fc_bytes;
1667 /*
1668 * Main fast commit lock. This lock protects accesses to the
1669 * following fields:
1670 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1671 */
1672 spinlock_t s_fc_lock;
1673 struct buffer_head *s_fc_bh;
1674 struct ext4_fc_stats s_fc_stats;
1675 u64 s_fc_avg_commit_time;
1676 #ifdef CONFIG_EXT4_DEBUG
1677 int s_fc_debug_max_replay;
1678 #endif
1679 struct ext4_fc_replay_state s_fc_replay_state;
1680 };
1681
1682 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1683 {
1684 return sb->s_fs_info;
1685 }
1686 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1687 {
1688 return container_of(inode, struct ext4_inode_info, vfs_inode);
1689 }
1690
1691 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1692 {
1693 return ino == EXT4_ROOT_INO ||
1694 (ino >= EXT4_FIRST_INO(sb) &&
1695 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1696 }
1697
1698 /*
1699 * Returns: sbi->field[index]
1700 * Used to access an array element from the following sbi fields which require
1701 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1702 * - s_group_desc
1703 * - s_group_info
1704 * - s_flex_group
1705 */
1706 #define sbi_array_rcu_deref(sbi, field, index) \
1707 ({ \
1708 typeof(*((sbi)->field)) _v; \
1709 rcu_read_lock(); \
1710 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1711 rcu_read_unlock(); \
1712 _v; \
1713 })
1714
1715 /*
1716 * run-time mount flags
1717 */
1718 enum {
1719 EXT4_MF_MNTDIR_SAMPLED,
1720 EXT4_MF_FS_ABORTED, /* Fatal error detected */
1721 EXT4_MF_FC_INELIGIBLE, /* Fast commit ineligible */
1722 EXT4_MF_FC_COMMITTING /* File system underoing a fast
1723 * commit.
1724 */
1725 };
1726
1727 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1728 {
1729 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1730 }
1731
1732 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1733 {
1734 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1735 }
1736
1737 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1738 {
1739 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1740 }
1741
1742
1743 /*
1744 * Simulate_fail codes
1745 */
1746 #define EXT4_SIM_BBITMAP_EIO 1
1747 #define EXT4_SIM_BBITMAP_CRC 2
1748 #define EXT4_SIM_IBITMAP_EIO 3
1749 #define EXT4_SIM_IBITMAP_CRC 4
1750 #define EXT4_SIM_INODE_EIO 5
1751 #define EXT4_SIM_INODE_CRC 6
1752 #define EXT4_SIM_DIRBLOCK_EIO 7
1753 #define EXT4_SIM_DIRBLOCK_CRC 8
1754
1755 static inline bool ext4_simulate_fail(struct super_block *sb,
1756 unsigned long code)
1757 {
1758 #ifdef CONFIG_EXT4_DEBUG
1759 struct ext4_sb_info *sbi = EXT4_SB(sb);
1760
1761 if (unlikely(sbi->s_simulate_fail == code)) {
1762 sbi->s_simulate_fail = 0;
1763 return true;
1764 }
1765 #endif
1766 return false;
1767 }
1768
1769 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1770 struct buffer_head *bh,
1771 unsigned long code)
1772 {
1773 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1774 clear_buffer_uptodate(bh);
1775 }
1776
1777 /*
1778 * Error number codes for s_{first,last}_error_errno
1779 *
1780 * Linux errno numbers are architecture specific, so we need to translate
1781 * them into something which is architecture independent. We don't define
1782 * codes for all errno's; just the ones which are most likely to be the cause
1783 * of an ext4_error() call.
1784 */
1785 #define EXT4_ERR_UNKNOWN 1
1786 #define EXT4_ERR_EIO 2
1787 #define EXT4_ERR_ENOMEM 3
1788 #define EXT4_ERR_EFSBADCRC 4
1789 #define EXT4_ERR_EFSCORRUPTED 5
1790 #define EXT4_ERR_ENOSPC 6
1791 #define EXT4_ERR_ENOKEY 7
1792 #define EXT4_ERR_EROFS 8
1793 #define EXT4_ERR_EFBIG 9
1794 #define EXT4_ERR_EEXIST 10
1795 #define EXT4_ERR_ERANGE 11
1796 #define EXT4_ERR_EOVERFLOW 12
1797 #define EXT4_ERR_EBUSY 13
1798 #define EXT4_ERR_ENOTDIR 14
1799 #define EXT4_ERR_ENOTEMPTY 15
1800 #define EXT4_ERR_ESHUTDOWN 16
1801 #define EXT4_ERR_EFAULT 17
1802
1803 /*
1804 * Inode dynamic state flags
1805 */
1806 enum {
1807 EXT4_STATE_JDATA, /* journaled data exists */
1808 EXT4_STATE_NEW, /* inode is newly created */
1809 EXT4_STATE_XATTR, /* has in-inode xattrs */
1810 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1811 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1812 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1813 EXT4_STATE_NEWENTRY, /* File just added to dir */
1814 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1815 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1816 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1817 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1818 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1819 };
1820
1821 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1822 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1823 { \
1824 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1825 } \
1826 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1827 { \
1828 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1829 } \
1830 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1831 { \
1832 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1833 }
1834
1835 /* Add these declarations here only so that these functions can be
1836 * found by name. Otherwise, they are very hard to locate. */
1837 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1838 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1839 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1840 EXT4_INODE_BIT_FNS(flag, flags, 0)
1841
1842 /* Add these declarations here only so that these functions can be
1843 * found by name. Otherwise, they are very hard to locate. */
1844 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1845 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1846 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1847 #if (BITS_PER_LONG < 64)
1848 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1849
1850 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1851 {
1852 (ei)->i_state_flags = 0;
1853 }
1854 #else
1855 EXT4_INODE_BIT_FNS(state, flags, 32)
1856
1857 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1858 {
1859 /* We depend on the fact that callers will set i_flags */
1860 }
1861 #endif
1862 #else
1863 /* Assume that user mode programs are passing in an ext4fs superblock, not
1864 * a kernel struct super_block. This will allow us to call the feature-test
1865 * macros from user land. */
1866 #define EXT4_SB(sb) (sb)
1867 #endif
1868
1869 static inline bool ext4_verity_in_progress(struct inode *inode)
1870 {
1871 return IS_ENABLED(CONFIG_FS_VERITY) &&
1872 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1873 }
1874
1875 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1876
1877 /*
1878 * Codes for operating systems
1879 */
1880 #define EXT4_OS_LINUX 0
1881 #define EXT4_OS_HURD 1
1882 #define EXT4_OS_MASIX 2
1883 #define EXT4_OS_FREEBSD 3
1884 #define EXT4_OS_LITES 4
1885
1886 /*
1887 * Revision levels
1888 */
1889 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1890 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1891
1892 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1893
1894 #define EXT4_GOOD_OLD_INODE_SIZE 128
1895
1896 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1897 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1898 #define EXT4_TIMESTAMP_MIN S32_MIN
1899
1900 /*
1901 * Feature set definitions
1902 */
1903
1904 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1905 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1906 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1907 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1908 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1909 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1910 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1911 /*
1912 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1913 * incompatible only if fast commit blocks are present in the FS. Since we
1914 * clear the journal (and thus the fast commit blocks), we don't mark FS as
1915 * incompatible. We also have a JBD2 incompat feature, which gets set when
1916 * there are fast commit blocks present in the journal.
1917 */
1918 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
1919 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1920
1921 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1922 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1923 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1924 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1925 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1926 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1927 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1928 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1929 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1930 /*
1931 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1932 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1933 * all other data structures' checksums. However, the METADATA_CSUM and
1934 * GDT_CSUM bits are mutually exclusive.
1935 */
1936 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1937 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1938 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1939 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
1940
1941 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1942 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1943 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1944 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1945 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1946 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1947 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1948 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1949 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1950 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1951 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1952 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1953 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1954 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1955 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1956 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
1957
1958 extern void ext4_update_dynamic_rev(struct super_block *sb);
1959
1960 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1961 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1962 { \
1963 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1964 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1965 } \
1966 static inline void ext4_set_feature_##name(struct super_block *sb) \
1967 { \
1968 ext4_update_dynamic_rev(sb); \
1969 EXT4_SB(sb)->s_es->s_feature_compat |= \
1970 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1971 } \
1972 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1973 { \
1974 EXT4_SB(sb)->s_es->s_feature_compat &= \
1975 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1976 }
1977
1978 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1979 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1980 { \
1981 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1982 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1983 } \
1984 static inline void ext4_set_feature_##name(struct super_block *sb) \
1985 { \
1986 ext4_update_dynamic_rev(sb); \
1987 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1988 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1989 } \
1990 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1991 { \
1992 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1993 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1994 }
1995
1996 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1997 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1998 { \
1999 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2000 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2001 } \
2002 static inline void ext4_set_feature_##name(struct super_block *sb) \
2003 { \
2004 ext4_update_dynamic_rev(sb); \
2005 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2006 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2007 } \
2008 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2009 { \
2010 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2011 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2012 }
2013
2014 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2015 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2016 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2017 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2018 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2019 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2020 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2021 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2022 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2023
2024 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2025 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2026 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2027 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2028 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2029 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2030 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2031 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2032 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2033 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2034 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2035 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2036 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2037
2038 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2039 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2040 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2041 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2042 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2043 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2044 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2045 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2046 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2047 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2048 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2049 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2050 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2051 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2052 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2053 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2054
2055 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2056 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2057 EXT4_FEATURE_INCOMPAT_META_BG)
2058 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2059 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2060 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2061
2062 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2063 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2064 EXT4_FEATURE_INCOMPAT_RECOVER| \
2065 EXT4_FEATURE_INCOMPAT_META_BG)
2066 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2067 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2068 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2069
2070 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2071 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2072 EXT4_FEATURE_INCOMPAT_RECOVER| \
2073 EXT4_FEATURE_INCOMPAT_META_BG| \
2074 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2075 EXT4_FEATURE_INCOMPAT_64BIT| \
2076 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2077 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2078 EXT4_FEATURE_INCOMPAT_MMP | \
2079 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2080 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2081 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2082 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2083 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2084 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2085 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2086 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2087 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2088 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2089 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2090 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2091 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2092 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2093 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2094 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2095 EXT4_FEATURE_RO_COMPAT_VERITY)
2096
2097 #define EXTN_FEATURE_FUNCS(ver) \
2098 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2099 { \
2100 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2101 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2102 } \
2103 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2104 { \
2105 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2106 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2107 } \
2108 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2109 { \
2110 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2111 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2112 }
2113
2114 EXTN_FEATURE_FUNCS(2)
2115 EXTN_FEATURE_FUNCS(3)
2116 EXTN_FEATURE_FUNCS(4)
2117
2118 static inline bool ext4_has_compat_features(struct super_block *sb)
2119 {
2120 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2121 }
2122 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2123 {
2124 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2125 }
2126 static inline bool ext4_has_incompat_features(struct super_block *sb)
2127 {
2128 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2129 }
2130
2131 /*
2132 * Superblock flags
2133 */
2134 #define EXT4_FLAGS_RESIZING 0
2135 #define EXT4_FLAGS_SHUTDOWN 1
2136 #define EXT4_FLAGS_BDEV_IS_DAX 2
2137
2138 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2139 {
2140 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2141 }
2142
2143
2144 /*
2145 * Default values for user and/or group using reserved blocks
2146 */
2147 #define EXT4_DEF_RESUID 0
2148 #define EXT4_DEF_RESGID 0
2149
2150 /*
2151 * Default project ID
2152 */
2153 #define EXT4_DEF_PROJID 0
2154
2155 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2156
2157 /*
2158 * Default mount options
2159 */
2160 #define EXT4_DEFM_DEBUG 0x0001
2161 #define EXT4_DEFM_BSDGROUPS 0x0002
2162 #define EXT4_DEFM_XATTR_USER 0x0004
2163 #define EXT4_DEFM_ACL 0x0008
2164 #define EXT4_DEFM_UID16 0x0010
2165 #define EXT4_DEFM_JMODE 0x0060
2166 #define EXT4_DEFM_JMODE_DATA 0x0020
2167 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2168 #define EXT4_DEFM_JMODE_WBACK 0x0060
2169 #define EXT4_DEFM_NOBARRIER 0x0100
2170 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2171 #define EXT4_DEFM_DISCARD 0x0400
2172 #define EXT4_DEFM_NODELALLOC 0x0800
2173
2174 /*
2175 * Default journal batch times
2176 */
2177 #define EXT4_DEF_MIN_BATCH_TIME 0
2178 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2179
2180 /*
2181 * Minimum number of groups in a flexgroup before we separate out
2182 * directories into the first block group of a flexgroup
2183 */
2184 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2185
2186 /*
2187 * Structure of a directory entry
2188 */
2189 #define EXT4_NAME_LEN 255
2190
2191 struct ext4_dir_entry {
2192 __le32 inode; /* Inode number */
2193 __le16 rec_len; /* Directory entry length */
2194 __le16 name_len; /* Name length */
2195 char name[EXT4_NAME_LEN]; /* File name */
2196 };
2197
2198 /*
2199 * The new version of the directory entry. Since EXT4 structures are
2200 * stored in intel byte order, and the name_len field could never be
2201 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2202 * file_type field.
2203 */
2204 struct ext4_dir_entry_2 {
2205 __le32 inode; /* Inode number */
2206 __le16 rec_len; /* Directory entry length */
2207 __u8 name_len; /* Name length */
2208 __u8 file_type; /* See file type macros EXT4_FT_* below */
2209 char name[EXT4_NAME_LEN]; /* File name */
2210 };
2211
2212 /*
2213 * This is a bogus directory entry at the end of each leaf block that
2214 * records checksums.
2215 */
2216 struct ext4_dir_entry_tail {
2217 __le32 det_reserved_zero1; /* Pretend to be unused */
2218 __le16 det_rec_len; /* 12 */
2219 __u8 det_reserved_zero2; /* Zero name length */
2220 __u8 det_reserved_ft; /* 0xDE, fake file type */
2221 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2222 };
2223
2224 #define EXT4_DIRENT_TAIL(block, blocksize) \
2225 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2226 ((blocksize) - \
2227 sizeof(struct ext4_dir_entry_tail))))
2228
2229 /*
2230 * Ext4 directory file types. Only the low 3 bits are used. The
2231 * other bits are reserved for now.
2232 */
2233 #define EXT4_FT_UNKNOWN 0
2234 #define EXT4_FT_REG_FILE 1
2235 #define EXT4_FT_DIR 2
2236 #define EXT4_FT_CHRDEV 3
2237 #define EXT4_FT_BLKDEV 4
2238 #define EXT4_FT_FIFO 5
2239 #define EXT4_FT_SOCK 6
2240 #define EXT4_FT_SYMLINK 7
2241
2242 #define EXT4_FT_MAX 8
2243
2244 #define EXT4_FT_DIR_CSUM 0xDE
2245
2246 /*
2247 * EXT4_DIR_PAD defines the directory entries boundaries
2248 *
2249 * NOTE: It must be a multiple of 4
2250 */
2251 #define EXT4_DIR_PAD 4
2252 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2253 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
2254 ~EXT4_DIR_ROUND)
2255 #define EXT4_MAX_REC_LEN ((1<<16)-1)
2256
2257 /*
2258 * If we ever get support for fs block sizes > page_size, we'll need
2259 * to remove the #if statements in the next two functions...
2260 */
2261 static inline unsigned int
2262 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2263 {
2264 unsigned len = le16_to_cpu(dlen);
2265
2266 #if (PAGE_SIZE >= 65536)
2267 if (len == EXT4_MAX_REC_LEN || len == 0)
2268 return blocksize;
2269 return (len & 65532) | ((len & 3) << 16);
2270 #else
2271 return len;
2272 #endif
2273 }
2274
2275 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2276 {
2277 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2278 BUG();
2279 #if (PAGE_SIZE >= 65536)
2280 if (len < 65536)
2281 return cpu_to_le16(len);
2282 if (len == blocksize) {
2283 if (blocksize == 65536)
2284 return cpu_to_le16(EXT4_MAX_REC_LEN);
2285 else
2286 return cpu_to_le16(0);
2287 }
2288 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2289 #else
2290 return cpu_to_le16(len);
2291 #endif
2292 }
2293
2294 /*
2295 * Hash Tree Directory indexing
2296 * (c) Daniel Phillips, 2001
2297 */
2298
2299 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2300 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2301 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2302 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2303 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2304
2305 /* Legal values for the dx_root hash_version field: */
2306
2307 #define DX_HASH_LEGACY 0
2308 #define DX_HASH_HALF_MD4 1
2309 #define DX_HASH_TEA 2
2310 #define DX_HASH_LEGACY_UNSIGNED 3
2311 #define DX_HASH_HALF_MD4_UNSIGNED 4
2312 #define DX_HASH_TEA_UNSIGNED 5
2313
2314 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2315 const void *address, unsigned int length)
2316 {
2317 struct {
2318 struct shash_desc shash;
2319 char ctx[4];
2320 } desc;
2321
2322 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2323
2324 desc.shash.tfm = sbi->s_chksum_driver;
2325 *(u32 *)desc.ctx = crc;
2326
2327 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2328
2329 return *(u32 *)desc.ctx;
2330 }
2331
2332 #ifdef __KERNEL__
2333
2334 /* hash info structure used by the directory hash */
2335 struct dx_hash_info
2336 {
2337 u32 hash;
2338 u32 minor_hash;
2339 int hash_version;
2340 u32 *seed;
2341 };
2342
2343
2344 /* 32 and 64 bit signed EOF for dx directories */
2345 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2346 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2347
2348
2349 /*
2350 * Control parameters used by ext4_htree_next_block
2351 */
2352 #define HASH_NB_ALWAYS 1
2353
2354 struct ext4_filename {
2355 const struct qstr *usr_fname;
2356 struct fscrypt_str disk_name;
2357 struct dx_hash_info hinfo;
2358 #ifdef CONFIG_FS_ENCRYPTION
2359 struct fscrypt_str crypto_buf;
2360 #endif
2361 #ifdef CONFIG_UNICODE
2362 struct fscrypt_str cf_name;
2363 #endif
2364 };
2365
2366 #define fname_name(p) ((p)->disk_name.name)
2367 #define fname_len(p) ((p)->disk_name.len)
2368
2369 /*
2370 * Describe an inode's exact location on disk and in memory
2371 */
2372 struct ext4_iloc
2373 {
2374 struct buffer_head *bh;
2375 unsigned long offset;
2376 ext4_group_t block_group;
2377 };
2378
2379 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2380 {
2381 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2382 }
2383
2384 static inline bool ext4_is_quota_file(struct inode *inode)
2385 {
2386 return IS_NOQUOTA(inode) &&
2387 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2388 }
2389
2390 /*
2391 * This structure is stuffed into the struct file's private_data field
2392 * for directories. It is where we put information so that we can do
2393 * readdir operations in hash tree order.
2394 */
2395 struct dir_private_info {
2396 struct rb_root root;
2397 struct rb_node *curr_node;
2398 struct fname *extra_fname;
2399 loff_t last_pos;
2400 __u32 curr_hash;
2401 __u32 curr_minor_hash;
2402 __u32 next_hash;
2403 };
2404
2405 /* calculate the first block number of the group */
2406 static inline ext4_fsblk_t
2407 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2408 {
2409 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2410 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2411 }
2412
2413 /*
2414 * Special error return code only used by dx_probe() and its callers.
2415 */
2416 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2417
2418 /* htree levels for ext4 */
2419 #define EXT4_HTREE_LEVEL_COMPAT 2
2420 #define EXT4_HTREE_LEVEL 3
2421
2422 static inline int ext4_dir_htree_level(struct super_block *sb)
2423 {
2424 return ext4_has_feature_largedir(sb) ?
2425 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2426 }
2427
2428 /*
2429 * Timeout and state flag for lazy initialization inode thread.
2430 */
2431 #define EXT4_DEF_LI_WAIT_MULT 10
2432 #define EXT4_DEF_LI_MAX_START_DELAY 5
2433 #define EXT4_LAZYINIT_QUIT 0x0001
2434 #define EXT4_LAZYINIT_RUNNING 0x0002
2435
2436 /*
2437 * Lazy inode table initialization info
2438 */
2439 struct ext4_lazy_init {
2440 unsigned long li_state;
2441 struct list_head li_request_list;
2442 struct mutex li_list_mtx;
2443 };
2444
2445 enum ext4_li_mode {
2446 EXT4_LI_MODE_PREFETCH_BBITMAP,
2447 EXT4_LI_MODE_ITABLE,
2448 };
2449
2450 struct ext4_li_request {
2451 struct super_block *lr_super;
2452 enum ext4_li_mode lr_mode;
2453 ext4_group_t lr_first_not_zeroed;
2454 ext4_group_t lr_next_group;
2455 struct list_head lr_request;
2456 unsigned long lr_next_sched;
2457 unsigned long lr_timeout;
2458 };
2459
2460 struct ext4_features {
2461 struct kobject f_kobj;
2462 struct completion f_kobj_unregister;
2463 };
2464
2465 /*
2466 * This structure will be used for multiple mount protection. It will be
2467 * written into the block number saved in the s_mmp_block field in the
2468 * superblock. Programs that check MMP should assume that if
2469 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2470 * to use the filesystem, regardless of how old the timestamp is.
2471 */
2472 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2473 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2474 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2475 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2476
2477 struct mmp_struct {
2478 __le32 mmp_magic; /* Magic number for MMP */
2479 __le32 mmp_seq; /* Sequence no. updated periodically */
2480
2481 /*
2482 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2483 * purposes and do not affect the correctness of the algorithm
2484 */
2485 __le64 mmp_time; /* Time last updated */
2486 char mmp_nodename[64]; /* Node which last updated MMP block */
2487 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2488
2489 /*
2490 * mmp_check_interval is used to verify if the MMP block has been
2491 * updated on the block device. The value is updated based on the
2492 * maximum time to write the MMP block during an update cycle.
2493 */
2494 __le16 mmp_check_interval;
2495
2496 __le16 mmp_pad1;
2497 __le32 mmp_pad2[226];
2498 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2499 };
2500
2501 /* arguments passed to the mmp thread */
2502 struct mmpd_data {
2503 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2504 struct super_block *sb; /* super block of the fs */
2505 };
2506
2507 /*
2508 * Check interval multiplier
2509 * The MMP block is written every update interval and initially checked every
2510 * update interval x the multiplier (the value is then adapted based on the
2511 * write latency). The reason is that writes can be delayed under load and we
2512 * don't want readers to incorrectly assume that the filesystem is no longer
2513 * in use.
2514 */
2515 #define EXT4_MMP_CHECK_MULT 2UL
2516
2517 /*
2518 * Minimum interval for MMP checking in seconds.
2519 */
2520 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2521
2522 /*
2523 * Maximum interval for MMP checking in seconds.
2524 */
2525 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2526
2527 /*
2528 * Function prototypes
2529 */
2530
2531 /*
2532 * Ok, these declarations are also in <linux/kernel.h> but none of the
2533 * ext4 source programs needs to include it so they are duplicated here.
2534 */
2535 # define NORET_TYPE /**/
2536 # define ATTRIB_NORET __attribute__((noreturn))
2537 # define NORET_AND noreturn,
2538
2539 /* bitmap.c */
2540 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2541 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2542 struct ext4_group_desc *gdp,
2543 struct buffer_head *bh, int sz);
2544 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2545 struct ext4_group_desc *gdp,
2546 struct buffer_head *bh, int sz);
2547 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2548 struct ext4_group_desc *gdp,
2549 struct buffer_head *bh);
2550 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2551 struct ext4_group_desc *gdp,
2552 struct buffer_head *bh);
2553
2554 /* balloc.c */
2555 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2556 ext4_fsblk_t blocknr,
2557 ext4_group_t *blockgrpp,
2558 ext4_grpblk_t *offsetp);
2559 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2560 ext4_fsblk_t block);
2561
2562 extern unsigned int ext4_block_group(struct super_block *sb,
2563 ext4_fsblk_t blocknr);
2564 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2565 ext4_fsblk_t blocknr);
2566 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2567 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2568 ext4_group_t group);
2569 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2570 ext4_fsblk_t goal,
2571 unsigned int flags,
2572 unsigned long *count,
2573 int *errp);
2574 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2575 s64 nclusters, unsigned int flags);
2576 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2577 extern void ext4_check_blocks_bitmap(struct super_block *);
2578 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2579 ext4_group_t block_group,
2580 struct buffer_head ** bh);
2581 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2582
2583 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2584 ext4_group_t block_group,
2585 bool ignore_locked);
2586 extern int ext4_wait_block_bitmap(struct super_block *sb,
2587 ext4_group_t block_group,
2588 struct buffer_head *bh);
2589 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2590 ext4_group_t block_group);
2591 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2592 ext4_group_t block_group,
2593 struct ext4_group_desc *gdp);
2594 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2595
2596 #ifdef CONFIG_UNICODE
2597 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2598 const struct qstr *iname,
2599 struct fscrypt_str *fname);
2600 #endif
2601
2602 #ifdef CONFIG_FS_ENCRYPTION
2603 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2604 const struct fscrypt_name *src)
2605 {
2606 memset(dst, 0, sizeof(*dst));
2607
2608 dst->usr_fname = src->usr_fname;
2609 dst->disk_name = src->disk_name;
2610 dst->hinfo.hash = src->hash;
2611 dst->hinfo.minor_hash = src->minor_hash;
2612 dst->crypto_buf = src->crypto_buf;
2613 }
2614
2615 static inline int ext4_fname_setup_filename(struct inode *dir,
2616 const struct qstr *iname,
2617 int lookup,
2618 struct ext4_filename *fname)
2619 {
2620 struct fscrypt_name name;
2621 int err;
2622
2623 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2624 if (err)
2625 return err;
2626
2627 ext4_fname_from_fscrypt_name(fname, &name);
2628
2629 #ifdef CONFIG_UNICODE
2630 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2631 #endif
2632 return 0;
2633 }
2634
2635 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2636 struct dentry *dentry,
2637 struct ext4_filename *fname)
2638 {
2639 struct fscrypt_name name;
2640 int err;
2641
2642 err = fscrypt_prepare_lookup(dir, dentry, &name);
2643 if (err)
2644 return err;
2645
2646 ext4_fname_from_fscrypt_name(fname, &name);
2647
2648 #ifdef CONFIG_UNICODE
2649 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2650 #endif
2651 return 0;
2652 }
2653
2654 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2655 {
2656 struct fscrypt_name name;
2657
2658 name.crypto_buf = fname->crypto_buf;
2659 fscrypt_free_filename(&name);
2660
2661 fname->crypto_buf.name = NULL;
2662 fname->usr_fname = NULL;
2663 fname->disk_name.name = NULL;
2664
2665 #ifdef CONFIG_UNICODE
2666 kfree(fname->cf_name.name);
2667 fname->cf_name.name = NULL;
2668 #endif
2669 }
2670 #else /* !CONFIG_FS_ENCRYPTION */
2671 static inline int ext4_fname_setup_filename(struct inode *dir,
2672 const struct qstr *iname,
2673 int lookup,
2674 struct ext4_filename *fname)
2675 {
2676 fname->usr_fname = iname;
2677 fname->disk_name.name = (unsigned char *) iname->name;
2678 fname->disk_name.len = iname->len;
2679
2680 #ifdef CONFIG_UNICODE
2681 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2682 #endif
2683
2684 return 0;
2685 }
2686
2687 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2688 struct dentry *dentry,
2689 struct ext4_filename *fname)
2690 {
2691 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2692 }
2693
2694 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2695 {
2696 #ifdef CONFIG_UNICODE
2697 kfree(fname->cf_name.name);
2698 fname->cf_name.name = NULL;
2699 #endif
2700 }
2701 #endif /* !CONFIG_FS_ENCRYPTION */
2702
2703 /* dir.c */
2704 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2705 struct file *,
2706 struct ext4_dir_entry_2 *,
2707 struct buffer_head *, char *, int,
2708 unsigned int);
2709 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2710 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2711 (de), (bh), (buf), (size), (offset)))
2712 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2713 __u32 minor_hash,
2714 struct ext4_dir_entry_2 *dirent,
2715 struct fscrypt_str *ent_name);
2716 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2717 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2718 struct buffer_head *bh,
2719 void *buf, int buf_size,
2720 struct ext4_filename *fname,
2721 struct ext4_dir_entry_2 **dest_de);
2722 void ext4_insert_dentry(struct inode *inode,
2723 struct ext4_dir_entry_2 *de,
2724 int buf_size,
2725 struct ext4_filename *fname);
2726 static inline void ext4_update_dx_flag(struct inode *inode)
2727 {
2728 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2729 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2730 /* ext4_iget() should have caught this... */
2731 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2732 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2733 }
2734 }
2735 static const unsigned char ext4_filetype_table[] = {
2736 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2737 };
2738
2739 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2740 {
2741 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2742 return DT_UNKNOWN;
2743
2744 return ext4_filetype_table[filetype];
2745 }
2746 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2747 void *buf, int buf_size);
2748
2749 /* fsync.c */
2750 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2751
2752 /* hash.c */
2753 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2754 struct dx_hash_info *hinfo);
2755
2756 /* ialloc.c */
2757 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2758 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2759 const struct qstr *qstr, __u32 goal,
2760 uid_t *owner, __u32 i_flags,
2761 int handle_type, unsigned int line_no,
2762 int nblocks);
2763
2764 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2765 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2766 i_flags, 0, 0, 0)
2767 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2768 type, nblocks) \
2769 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2770 0, (type), __LINE__, (nblocks))
2771
2772
2773 extern void ext4_free_inode(handle_t *, struct inode *);
2774 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2775 extern unsigned long ext4_count_free_inodes(struct super_block *);
2776 extern unsigned long ext4_count_dirs(struct super_block *);
2777 extern void ext4_check_inodes_bitmap(struct super_block *);
2778 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2779 extern int ext4_init_inode_table(struct super_block *sb,
2780 ext4_group_t group, int barrier);
2781 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2782
2783 /* fast_commit.c */
2784 int ext4_fc_info_show(struct seq_file *seq, void *v);
2785 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2786 void ext4_fc_init_inode(struct inode *inode);
2787 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2788 ext4_lblk_t end);
2789 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2790 struct dentry *dentry);
2791 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2792 struct dentry *dentry);
2793 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2794 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2795 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2796 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2797 void ext4_fc_mark_ineligible(struct super_block *sb, int reason);
2798 void ext4_fc_start_ineligible(struct super_block *sb, int reason);
2799 void ext4_fc_stop_ineligible(struct super_block *sb);
2800 void ext4_fc_start_update(struct inode *inode);
2801 void ext4_fc_stop_update(struct inode *inode);
2802 void ext4_fc_del(struct inode *inode);
2803 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2804 void ext4_fc_replay_cleanup(struct super_block *sb);
2805 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2806 int __init ext4_fc_init_dentry_cache(void);
2807
2808 /* mballoc.c */
2809 extern const struct seq_operations ext4_mb_seq_groups_ops;
2810 extern long ext4_mb_stats;
2811 extern long ext4_mb_max_to_scan;
2812 extern int ext4_mb_init(struct super_block *);
2813 extern int ext4_mb_release(struct super_block *);
2814 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2815 struct ext4_allocation_request *, int *);
2816 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2817 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2818 extern int __init ext4_init_mballoc(void);
2819 extern void ext4_exit_mballoc(void);
2820 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2821 ext4_group_t group,
2822 unsigned int nr, int *cnt);
2823 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2824 unsigned int nr);
2825
2826 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2827 struct buffer_head *bh, ext4_fsblk_t block,
2828 unsigned long count, int flags);
2829 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2830 ext4_group_t ngroups);
2831 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2832 ext4_group_t i, struct ext4_group_desc *desc);
2833 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2834 ext4_fsblk_t block, unsigned long count);
2835 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2836 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2837 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2838 int len, int state);
2839
2840 /* inode.c */
2841 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2842 struct ext4_inode_info *ei);
2843 int ext4_inode_is_fast_symlink(struct inode *inode);
2844 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2845 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2846 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2847 bool wait, struct buffer_head **bhs);
2848 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2849 struct buffer_head *bh_result, int create);
2850 int ext4_get_block(struct inode *inode, sector_t iblock,
2851 struct buffer_head *bh_result, int create);
2852 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2853 struct buffer_head *bh, int create);
2854 int ext4_walk_page_buffers(handle_t *handle,
2855 struct buffer_head *head,
2856 unsigned from,
2857 unsigned to,
2858 int *partial,
2859 int (*fn)(handle_t *handle,
2860 struct buffer_head *bh));
2861 int do_journal_get_write_access(handle_t *handle,
2862 struct buffer_head *bh);
2863 #define FALL_BACK_TO_NONDELALLOC 1
2864 #define CONVERT_INLINE_DATA 2
2865
2866 typedef enum {
2867 EXT4_IGET_NORMAL = 0,
2868 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2869 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2870 } ext4_iget_flags;
2871
2872 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2873 ext4_iget_flags flags, const char *function,
2874 unsigned int line);
2875
2876 #define ext4_iget(sb, ino, flags) \
2877 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2878
2879 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2880 extern int ext4_setattr(struct dentry *, struct iattr *);
2881 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2882 extern void ext4_evict_inode(struct inode *);
2883 extern void ext4_clear_inode(struct inode *);
2884 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2885 extern int ext4_sync_inode(handle_t *, struct inode *);
2886 extern void ext4_dirty_inode(struct inode *, int);
2887 extern int ext4_change_inode_journal_flag(struct inode *, int);
2888 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2889 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2890 struct ext4_iloc *iloc);
2891 extern int ext4_inode_attach_jinode(struct inode *inode);
2892 extern int ext4_can_truncate(struct inode *inode);
2893 extern int ext4_truncate(struct inode *);
2894 extern int ext4_break_layouts(struct inode *);
2895 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2896 extern void ext4_set_inode_flags(struct inode *, bool init);
2897 extern int ext4_alloc_da_blocks(struct inode *inode);
2898 extern void ext4_set_aops(struct inode *inode);
2899 extern int ext4_writepage_trans_blocks(struct inode *);
2900 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2901 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2902 loff_t lstart, loff_t lend);
2903 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2904 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2905 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2906 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2907 extern void ext4_da_release_space(struct inode *inode, int to_free);
2908 extern void ext4_da_update_reserve_space(struct inode *inode,
2909 int used, int quota_claim);
2910 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2911 ext4_fsblk_t pblk, ext4_lblk_t len);
2912
2913 /* indirect.c */
2914 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2915 struct ext4_map_blocks *map, int flags);
2916 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2917 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2918 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2919 ext4_lblk_t start, ext4_lblk_t end);
2920
2921 /* ioctl.c */
2922 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2923 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2924 extern void ext4_reset_inode_seed(struct inode *inode);
2925
2926 /* migrate.c */
2927 extern int ext4_ext_migrate(struct inode *);
2928 extern int ext4_ind_migrate(struct inode *inode);
2929
2930 /* namei.c */
2931 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
2932 struct inode *inode);
2933 extern int ext4_dirblock_csum_verify(struct inode *inode,
2934 struct buffer_head *bh);
2935 extern int ext4_orphan_add(handle_t *, struct inode *);
2936 extern int ext4_orphan_del(handle_t *, struct inode *);
2937 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2938 __u32 start_minor_hash, __u32 *next_hash);
2939 extern int ext4_search_dir(struct buffer_head *bh,
2940 char *search_buf,
2941 int buf_size,
2942 struct inode *dir,
2943 struct ext4_filename *fname,
2944 unsigned int offset,
2945 struct ext4_dir_entry_2 **res_dir);
2946 extern int ext4_generic_delete_entry(struct inode *dir,
2947 struct ext4_dir_entry_2 *de_del,
2948 struct buffer_head *bh,
2949 void *entry_buf,
2950 int buf_size,
2951 int csum_size);
2952 extern bool ext4_empty_dir(struct inode *inode);
2953
2954 /* resize.c */
2955 extern void ext4_kvfree_array_rcu(void *to_free);
2956 extern int ext4_group_add(struct super_block *sb,
2957 struct ext4_new_group_data *input);
2958 extern int ext4_group_extend(struct super_block *sb,
2959 struct ext4_super_block *es,
2960 ext4_fsblk_t n_blocks_count);
2961 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2962
2963 /* super.c */
2964 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2965 sector_t block, int op_flags);
2966 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
2967 sector_t block);
2968 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
2969 bh_end_io_t *end_io);
2970 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
2971 bh_end_io_t *end_io);
2972 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
2973 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
2974 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2975 extern int ext4_calculate_overhead(struct super_block *sb);
2976 extern void ext4_superblock_csum_set(struct super_block *sb);
2977 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2978 ext4_group_t ngroup);
2979 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2980 char nbuf[16]);
2981 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2982 ext4_group_t block_group,
2983 unsigned int flags);
2984
2985 extern __printf(7, 8)
2986 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
2987 int, __u64, const char *, ...);
2988 extern __printf(6, 7)
2989 void __ext4_error_inode(struct inode *, const char *, unsigned int,
2990 ext4_fsblk_t, int, const char *, ...);
2991 extern __printf(5, 6)
2992 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2993 const char *, ...);
2994 extern void __ext4_std_error(struct super_block *, const char *,
2995 unsigned int, int);
2996 extern __printf(4, 5)
2997 void __ext4_warning(struct super_block *, const char *, unsigned int,
2998 const char *, ...);
2999 extern __printf(4, 5)
3000 void __ext4_warning_inode(const struct inode *inode, const char *function,
3001 unsigned int line, const char *fmt, ...);
3002 extern __printf(3, 4)
3003 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3004 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3005 const char *, unsigned int, const char *);
3006 extern __printf(7, 8)
3007 void __ext4_grp_locked_error(const char *, unsigned int,
3008 struct super_block *, ext4_group_t,
3009 unsigned long, ext4_fsblk_t,
3010 const char *, ...);
3011
3012 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3013 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3014
3015 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3016 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3017
3018 #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3019 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3020 (fmt), ## a)
3021
3022 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3023 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3024
3025 #define ext4_abort(sb, err, fmt, a...) \
3026 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3027
3028 #ifdef CONFIG_PRINTK
3029
3030 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3031 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3032 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3033 __ext4_error_inode((inode), (func), (line), (block), \
3034 (err), (fmt), ##__VA_ARGS__)
3035 #define ext4_error_file(file, func, line, block, fmt, ...) \
3036 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3037 #define ext4_error(sb, fmt, ...) \
3038 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3039 ##__VA_ARGS__)
3040 #define ext4_error_err(sb, err, fmt, ...) \
3041 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3042 ##__VA_ARGS__)
3043 #define ext4_warning(sb, fmt, ...) \
3044 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3045 #define ext4_warning_inode(inode, fmt, ...) \
3046 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3047 #define ext4_msg(sb, level, fmt, ...) \
3048 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3049 #define dump_mmp_msg(sb, mmp, msg) \
3050 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3051 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3052 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3053 fmt, ##__VA_ARGS__)
3054
3055 #else
3056
3057 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3058 do { \
3059 no_printk(fmt, ##__VA_ARGS__); \
3060 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3061 } while (0)
3062 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3063 do { \
3064 no_printk(fmt, ##__VA_ARGS__); \
3065 __ext4_error_inode(inode, "", 0, block, err, " "); \
3066 } while (0)
3067 #define ext4_error_file(file, func, line, block, fmt, ...) \
3068 do { \
3069 no_printk(fmt, ##__VA_ARGS__); \
3070 __ext4_error_file(file, "", 0, block, " "); \
3071 } while (0)
3072 #define ext4_error(sb, fmt, ...) \
3073 do { \
3074 no_printk(fmt, ##__VA_ARGS__); \
3075 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3076 } while (0)
3077 #define ext4_error_err(sb, err, fmt, ...) \
3078 do { \
3079 no_printk(fmt, ##__VA_ARGS__); \
3080 __ext4_error(sb, "", 0, false, err, 0, " "); \
3081 } while (0)
3082 #define ext4_warning(sb, fmt, ...) \
3083 do { \
3084 no_printk(fmt, ##__VA_ARGS__); \
3085 __ext4_warning(sb, "", 0, " "); \
3086 } while (0)
3087 #define ext4_warning_inode(inode, fmt, ...) \
3088 do { \
3089 no_printk(fmt, ##__VA_ARGS__); \
3090 __ext4_warning_inode(inode, "", 0, " "); \
3091 } while (0)
3092 #define ext4_msg(sb, level, fmt, ...) \
3093 do { \
3094 no_printk(fmt, ##__VA_ARGS__); \
3095 __ext4_msg(sb, "", " "); \
3096 } while (0)
3097 #define dump_mmp_msg(sb, mmp, msg) \
3098 __dump_mmp_msg(sb, mmp, "", 0, "")
3099 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3100 do { \
3101 no_printk(fmt, ##__VA_ARGS__); \
3102 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3103 } while (0)
3104
3105 #endif
3106
3107 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3108 struct ext4_group_desc *bg);
3109 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3110 struct ext4_group_desc *bg);
3111 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3112 struct ext4_group_desc *bg);
3113 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3114 struct ext4_group_desc *bg);
3115 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3116 struct ext4_group_desc *bg);
3117 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3118 struct ext4_group_desc *bg);
3119 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3120 struct ext4_group_desc *bg);
3121 extern void ext4_block_bitmap_set(struct super_block *sb,
3122 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3123 extern void ext4_inode_bitmap_set(struct super_block *sb,
3124 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3125 extern void ext4_inode_table_set(struct super_block *sb,
3126 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3127 extern void ext4_free_group_clusters_set(struct super_block *sb,
3128 struct ext4_group_desc *bg,
3129 __u32 count);
3130 extern void ext4_free_inodes_set(struct super_block *sb,
3131 struct ext4_group_desc *bg, __u32 count);
3132 extern void ext4_used_dirs_set(struct super_block *sb,
3133 struct ext4_group_desc *bg, __u32 count);
3134 extern void ext4_itable_unused_set(struct super_block *sb,
3135 struct ext4_group_desc *bg, __u32 count);
3136 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3137 struct ext4_group_desc *gdp);
3138 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3139 struct ext4_group_desc *gdp);
3140 extern int ext4_register_li_request(struct super_block *sb,
3141 ext4_group_t first_not_zeroed);
3142
3143 static inline int ext4_has_metadata_csum(struct super_block *sb)
3144 {
3145 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3146 !EXT4_SB(sb)->s_chksum_driver);
3147
3148 return ext4_has_feature_metadata_csum(sb) &&
3149 (EXT4_SB(sb)->s_chksum_driver != NULL);
3150 }
3151
3152 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3153 {
3154 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3155 }
3156
3157 #define ext4_read_incompat_64bit_val(es, name) \
3158 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3159 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3160 le32_to_cpu(es->name##_lo))
3161
3162 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3163 {
3164 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3165 }
3166
3167 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3168 {
3169 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3170 }
3171
3172 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3173 {
3174 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3175 }
3176
3177 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3178 ext4_fsblk_t blk)
3179 {
3180 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3181 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3182 }
3183
3184 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3185 ext4_fsblk_t blk)
3186 {
3187 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3188 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3189 }
3190
3191 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3192 ext4_fsblk_t blk)
3193 {
3194 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3195 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3196 }
3197
3198 static inline loff_t ext4_isize(struct super_block *sb,
3199 struct ext4_inode *raw_inode)
3200 {
3201 if (ext4_has_feature_largedir(sb) ||
3202 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3203 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3204 le32_to_cpu(raw_inode->i_size_lo);
3205
3206 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3207 }
3208
3209 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3210 {
3211 raw_inode->i_size_lo = cpu_to_le32(i_size);
3212 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3213 }
3214
3215 static inline
3216 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3217 ext4_group_t group)
3218 {
3219 struct ext4_group_info **grp_info;
3220 long indexv, indexh;
3221 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3222 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3223 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3224 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3225 return grp_info[indexh];
3226 }
3227
3228 /*
3229 * Reading s_groups_count requires using smp_rmb() afterwards. See
3230 * the locking protocol documented in the comments of ext4_group_add()
3231 * in resize.c
3232 */
3233 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3234 {
3235 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3236
3237 smp_rmb();
3238 return ngroups;
3239 }
3240
3241 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3242 ext4_group_t block_group)
3243 {
3244 return block_group >> sbi->s_log_groups_per_flex;
3245 }
3246
3247 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3248 {
3249 return 1 << sbi->s_log_groups_per_flex;
3250 }
3251
3252 #define ext4_std_error(sb, errno) \
3253 do { \
3254 if ((errno)) \
3255 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3256 } while (0)
3257
3258 #ifdef CONFIG_SMP
3259 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3260 * counters. So we need to make sure we have free clusters more
3261 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3262 */
3263 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3264 #else
3265 #define EXT4_FREECLUSTERS_WATERMARK 0
3266 #endif
3267
3268 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
3269 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3270 {
3271 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3272 !inode_is_locked(inode));
3273 down_write(&EXT4_I(inode)->i_data_sem);
3274 if (newsize > EXT4_I(inode)->i_disksize)
3275 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3276 up_write(&EXT4_I(inode)->i_data_sem);
3277 }
3278
3279 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3280 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3281 {
3282 int changed = 0;
3283
3284 if (newsize > inode->i_size) {
3285 i_size_write(inode, newsize);
3286 changed = 1;
3287 }
3288 if (newsize > EXT4_I(inode)->i_disksize) {
3289 ext4_update_i_disksize(inode, newsize);
3290 changed |= 2;
3291 }
3292 return changed;
3293 }
3294
3295 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3296 loff_t len);
3297
3298 struct ext4_group_info {
3299 unsigned long bb_state;
3300 #ifdef AGGRESSIVE_CHECK
3301 unsigned long bb_check_counter;
3302 #endif
3303 struct rb_root bb_free_root;
3304 ext4_grpblk_t bb_first_free; /* first free block */
3305 ext4_grpblk_t bb_free; /* total free blocks */
3306 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3307 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3308 struct list_head bb_prealloc_list;
3309 #ifdef DOUBLE_CHECK
3310 void *bb_bitmap;
3311 #endif
3312 struct rw_semaphore alloc_sem;
3313 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3314 * regions, index is order.
3315 * bb_counters[3] = 5 means
3316 * 5 free 8-block regions. */
3317 };
3318
3319 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3320 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3321 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3322 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3323 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3324 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3325 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3326 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3327 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3328
3329 #define EXT4_MB_GRP_NEED_INIT(grp) \
3330 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3331 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3332 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3333 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3334 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3335
3336 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3337 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3338 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3339 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3340 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3341 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3342 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3343 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3344
3345 #define EXT4_MAX_CONTENTION 8
3346 #define EXT4_CONTENTION_THRESHOLD 2
3347
3348 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3349 ext4_group_t group)
3350 {
3351 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3352 }
3353
3354 /*
3355 * Returns true if the filesystem is busy enough that attempts to
3356 * access the block group locks has run into contention.
3357 */
3358 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3359 {
3360 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3361 }
3362
3363 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3364 {
3365 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3366 if (spin_trylock(lock))
3367 /*
3368 * We're able to grab the lock right away, so drop the
3369 * lock contention counter.
3370 */
3371 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3372 else {
3373 /*
3374 * The lock is busy, so bump the contention counter,
3375 * and then wait on the spin lock.
3376 */
3377 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3378 EXT4_MAX_CONTENTION);
3379 spin_lock(lock);
3380 }
3381 }
3382
3383 static inline void ext4_unlock_group(struct super_block *sb,
3384 ext4_group_t group)
3385 {
3386 spin_unlock(ext4_group_lock_ptr(sb, group));
3387 }
3388
3389 #ifdef CONFIG_QUOTA
3390 static inline bool ext4_quota_capable(struct super_block *sb)
3391 {
3392 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3393 }
3394
3395 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3396 {
3397 struct ext4_sb_info *sbi = EXT4_SB(sb);
3398
3399 return (ext4_has_feature_quota(sb) ||
3400 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3401 }
3402 #endif
3403
3404 /*
3405 * Block validity checking
3406 */
3407 #define ext4_check_indirect_blockref(inode, bh) \
3408 ext4_check_blockref(__func__, __LINE__, inode, \
3409 (__le32 *)(bh)->b_data, \
3410 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3411
3412 #define ext4_ind_check_inode(inode) \
3413 ext4_check_blockref(__func__, __LINE__, inode, \
3414 EXT4_I(inode)->i_data, \
3415 EXT4_NDIR_BLOCKS)
3416
3417 /*
3418 * Inodes and files operations
3419 */
3420
3421 /* dir.c */
3422 extern const struct file_operations ext4_dir_operations;
3423
3424 /* file.c */
3425 extern const struct inode_operations ext4_file_inode_operations;
3426 extern const struct file_operations ext4_file_operations;
3427 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3428
3429 /* inline.c */
3430 extern int ext4_get_max_inline_size(struct inode *inode);
3431 extern int ext4_find_inline_data_nolock(struct inode *inode);
3432 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3433 unsigned int len);
3434 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3435
3436 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3437 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3438 struct inode *inode,
3439 loff_t pos, unsigned len,
3440 unsigned flags,
3441 struct page **pagep);
3442 extern int ext4_write_inline_data_end(struct inode *inode,
3443 loff_t pos, unsigned len,
3444 unsigned copied,
3445 struct page *page);
3446 extern struct buffer_head *
3447 ext4_journalled_write_inline_data(struct inode *inode,
3448 unsigned len,
3449 struct page *page);
3450 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3451 struct inode *inode,
3452 loff_t pos, unsigned len,
3453 unsigned flags,
3454 struct page **pagep,
3455 void **fsdata);
3456 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3457 unsigned len, unsigned copied,
3458 struct page *page);
3459 extern int ext4_try_add_inline_entry(handle_t *handle,
3460 struct ext4_filename *fname,
3461 struct inode *dir, struct inode *inode);
3462 extern int ext4_try_create_inline_dir(handle_t *handle,
3463 struct inode *parent,
3464 struct inode *inode);
3465 extern int ext4_read_inline_dir(struct file *filp,
3466 struct dir_context *ctx,
3467 int *has_inline_data);
3468 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3469 struct inode *dir, ext4_lblk_t block,
3470 struct dx_hash_info *hinfo,
3471 __u32 start_hash, __u32 start_minor_hash,
3472 int *has_inline_data);
3473 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3474 struct ext4_filename *fname,
3475 struct ext4_dir_entry_2 **res_dir,
3476 int *has_inline_data);
3477 extern int ext4_delete_inline_entry(handle_t *handle,
3478 struct inode *dir,
3479 struct ext4_dir_entry_2 *de_del,
3480 struct buffer_head *bh,
3481 int *has_inline_data);
3482 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3483 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3484 struct ext4_dir_entry_2 **parent_de,
3485 int *retval);
3486 extern int ext4_inline_data_fiemap(struct inode *inode,
3487 struct fiemap_extent_info *fieinfo,
3488 int *has_inline, __u64 start, __u64 len);
3489
3490 struct iomap;
3491 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3492
3493 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3494
3495 extern int ext4_convert_inline_data(struct inode *inode);
3496
3497 static inline int ext4_has_inline_data(struct inode *inode)
3498 {
3499 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3500 EXT4_I(inode)->i_inline_off;
3501 }
3502
3503 /* namei.c */
3504 extern const struct inode_operations ext4_dir_inode_operations;
3505 extern const struct inode_operations ext4_special_inode_operations;
3506 extern struct dentry *ext4_get_parent(struct dentry *child);
3507 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3508 struct ext4_dir_entry_2 *de,
3509 int blocksize, int csum_size,
3510 unsigned int parent_ino, int dotdot_real_len);
3511 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3512 unsigned int blocksize);
3513 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3514 struct buffer_head *bh);
3515 extern int ext4_ci_compare(const struct inode *parent,
3516 const struct qstr *fname,
3517 const struct qstr *entry, bool quick);
3518 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3519 struct inode *inode);
3520 extern int __ext4_link(struct inode *dir, struct inode *inode,
3521 struct dentry *dentry);
3522
3523 #define S_SHIFT 12
3524 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3525 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3526 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3527 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3528 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3529 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3530 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3531 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3532 };
3533
3534 static inline void ext4_set_de_type(struct super_block *sb,
3535 struct ext4_dir_entry_2 *de,
3536 umode_t mode) {
3537 if (ext4_has_feature_filetype(sb))
3538 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3539 }
3540
3541 /* readpages.c */
3542 extern int ext4_mpage_readpages(struct inode *inode,
3543 struct readahead_control *rac, struct page *page);
3544 extern int __init ext4_init_post_read_processing(void);
3545 extern void ext4_exit_post_read_processing(void);
3546
3547 /* symlink.c */
3548 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3549 extern const struct inode_operations ext4_symlink_inode_operations;
3550 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3551
3552 /* sysfs.c */
3553 extern int ext4_register_sysfs(struct super_block *sb);
3554 extern void ext4_unregister_sysfs(struct super_block *sb);
3555 extern int __init ext4_init_sysfs(void);
3556 extern void ext4_exit_sysfs(void);
3557
3558 /* block_validity */
3559 extern void ext4_release_system_zone(struct super_block *sb);
3560 extern int ext4_setup_system_zone(struct super_block *sb);
3561 extern int __init ext4_init_system_zone(void);
3562 extern void ext4_exit_system_zone(void);
3563 extern int ext4_inode_block_valid(struct inode *inode,
3564 ext4_fsblk_t start_blk,
3565 unsigned int count);
3566 extern int ext4_check_blockref(const char *, unsigned int,
3567 struct inode *, __le32 *, unsigned int);
3568
3569 /* extents.c */
3570 struct ext4_ext_path;
3571 struct ext4_extent;
3572
3573 /*
3574 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3575 * __le32.
3576 */
3577 #define EXT_MAX_BLOCKS 0xffffffff
3578
3579 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3580 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3581 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3582 struct ext4_map_blocks *map, int flags);
3583 extern int ext4_ext_truncate(handle_t *, struct inode *);
3584 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3585 ext4_lblk_t end);
3586 extern void ext4_ext_init(struct super_block *);
3587 extern void ext4_ext_release(struct super_block *);
3588 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3589 loff_t len);
3590 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3591 loff_t offset, ssize_t len);
3592 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3593 ext4_io_end_t *io_end);
3594 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3595 struct ext4_map_blocks *map, int flags);
3596 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3597 int num,
3598 struct ext4_ext_path *path);
3599 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3600 struct ext4_ext_path **,
3601 struct ext4_extent *, int);
3602 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3603 struct ext4_ext_path **,
3604 int flags);
3605 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3606 extern int ext4_ext_check_inode(struct inode *inode);
3607 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3608 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3609 __u64 start, __u64 len);
3610 extern int ext4_get_es_cache(struct inode *inode,
3611 struct fiemap_extent_info *fieinfo,
3612 __u64 start, __u64 len);
3613 extern int ext4_ext_precache(struct inode *inode);
3614 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3615 struct inode *inode2, ext4_lblk_t lblk1,
3616 ext4_lblk_t lblk2, ext4_lblk_t count,
3617 int mark_unwritten,int *err);
3618 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3619 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3620 int check_cred, int restart_cred,
3621 int revoke_cred);
3622 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3623 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3624 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3625 int len, int unwritten, ext4_fsblk_t pblk);
3626 extern int ext4_ext_clear_bb(struct inode *inode);
3627
3628
3629 /* move_extent.c */
3630 extern void ext4_double_down_write_data_sem(struct inode *first,
3631 struct inode *second);
3632 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3633 struct inode *donor_inode);
3634 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3635 __u64 start_orig, __u64 start_donor,
3636 __u64 len, __u64 *moved_len);
3637
3638 /* page-io.c */
3639 extern int __init ext4_init_pageio(void);
3640 extern void ext4_exit_pageio(void);
3641 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3642 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3643 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3644 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3645 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3646 struct writeback_control *wbc);
3647 extern void ext4_end_io_rsv_work(struct work_struct *work);
3648 extern void ext4_io_submit(struct ext4_io_submit *io);
3649 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3650 struct page *page,
3651 int len,
3652 bool keep_towrite);
3653 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3654 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3655
3656 /* mmp.c */
3657 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3658
3659 /* verity.c */
3660 extern const struct fsverity_operations ext4_verityops;
3661
3662 /*
3663 * Add new method to test whether block and inode bitmaps are properly
3664 * initialized. With uninit_bg reading the block from disk is not enough
3665 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3666 */
3667 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3668
3669 static inline int bitmap_uptodate(struct buffer_head *bh)
3670 {
3671 return (buffer_uptodate(bh) &&
3672 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3673 }
3674 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3675 {
3676 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3677 }
3678
3679 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3680
3681 /* For ioend & aio unwritten conversion wait queues */
3682 #define EXT4_WQ_HASH_SZ 37
3683 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3684 EXT4_WQ_HASH_SZ])
3685 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3686
3687 extern int ext4_resize_begin(struct super_block *sb);
3688 extern void ext4_resize_end(struct super_block *sb);
3689
3690 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3691 struct ext4_io_end *io_end)
3692 {
3693 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3694 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3695 atomic_inc(&EXT4_I(inode)->i_unwritten);
3696 }
3697 }
3698
3699 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3700 {
3701 struct inode *inode = io_end->inode;
3702
3703 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3704 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3705 /* Wake up anyone waiting on unwritten extent conversion */
3706 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3707 wake_up_all(ext4_ioend_wq(inode));
3708 }
3709 }
3710
3711 extern const struct iomap_ops ext4_iomap_ops;
3712 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3713 extern const struct iomap_ops ext4_iomap_report_ops;
3714
3715 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3716 {
3717 /*
3718 * If the buffer has the write error flag, we have failed
3719 * to write out data in the block. In this case, we don't
3720 * have to read the block because we may read the old data
3721 * successfully.
3722 */
3723 if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3724 set_buffer_uptodate(bh);
3725 return buffer_uptodate(bh);
3726 }
3727
3728 #endif /* __KERNEL__ */
3729
3730 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3731 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3732
3733 #endif /* _EXT4_H */
Linux with added FPC-III support