1 // SPDX-License-Identifier: GPL-2.0
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)
12 * linux/include/linux/minix_fs.h
14 * Copyright (C) 1991, 1992 Linus Torvalds
20 #include <linux/refcount.h>
21 #include <linux/types.h>
22 #include <linux/blkdev.h>
23 #include <linux/magic.h>
24 #include <linux/jbd2.h>
25 #include <linux/quota.h>
26 #include <linux/rwsem.h>
27 #include <linux/rbtree.h>
28 #include <linux/seqlock.h>
29 #include <linux/mutex.h>
30 #include <linux/timer.h>
31 #include <linux/wait.h>
32 #include <linux/sched/signal.h>
33 #include <linux/blockgroup_lock.h>
34 #include <linux/percpu_counter.h>
35 #include <linux/ratelimit.h>
36 #include <crypto/hash.h>
37 #include <linux/falloc.h>
38 #include <linux/percpu-rwsem.h>
39 #include <linux/fiemap.h>
41 #include <linux/compat.h>
44 #include <linux/fscrypt.h>
45 #include <linux/fsverity.h>
47 #include <linux/compiler.h>
50 * The fourth extended filesystem constants/structures
54 * with AGGRESSIVE_CHECK allocator runs consistency checks over
55 * structures. these checks slow things down a lot
57 #define AGGRESSIVE_CHECK__
60 * with DOUBLE_CHECK defined mballoc creates persistent in-core
61 * bitmaps, maintains and uses them to check for double allocations
63 #define DOUBLE_CHECK__
66 * Define EXT4FS_DEBUG to produce debug messages
74 #define ext4_debug(f, a...) \
76 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
77 __FILE__, __LINE__, __func__); \
78 printk(KERN_DEBUG f, ## a); \
81 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
85 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
90 * Dynamic printk for controlled extents debugging.
92 #ifdef CONFIG_EXT4_DEBUG
93 #define ext_debug(ino, fmt, ...) \
94 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
95 current->comm, task_pid_nr(current), \
96 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
97 __func__, ##__VA_ARGS__)
99 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
102 #define ASSERT(assert) \
104 if (unlikely(!(assert))) { \
106 "Assertion failure in %s() at %s:%d: '%s'\n", \
107 __func__, __FILE__, __LINE__, #assert); \
112 /* data type for block offset of block group */
113 typedef int ext4_grpblk_t;
115 /* data type for filesystem-wide blocks number */
116 typedef unsigned long long ext4_fsblk_t;
118 /* data type for file logical block number */
119 typedef __u32 ext4_lblk_t;
121 /* data type for block group number */
122 typedef unsigned int ext4_group_t;
124 enum SHIFT_DIRECTION {
130 * Flags used in mballoc's allocation_context flags field.
132 * Also used to show what's going on for debugging purposes when the
133 * flag field is exported via the traceport interface
136 /* prefer goal again. length */
137 #define EXT4_MB_HINT_MERGE 0x0001
138 /* blocks already reserved */
139 #define EXT4_MB_HINT_RESERVED 0x0002
140 /* metadata is being allocated */
141 #define EXT4_MB_HINT_METADATA 0x0004
142 /* first blocks in the file */
143 #define EXT4_MB_HINT_FIRST 0x0008
144 /* search for the best chunk */
145 #define EXT4_MB_HINT_BEST 0x0010
146 /* data is being allocated */
147 #define EXT4_MB_HINT_DATA 0x0020
148 /* don't preallocate (for tails) */
149 #define EXT4_MB_HINT_NOPREALLOC 0x0040
150 /* allocate for locality group */
151 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
152 /* allocate goal blocks or none */
153 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
154 /* goal is meaningful */
155 #define EXT4_MB_HINT_TRY_GOAL 0x0200
156 /* blocks already pre-reserved by delayed allocation */
157 #define EXT4_MB_DELALLOC_RESERVED 0x0400
158 /* We are doing stream allocation */
159 #define EXT4_MB_STREAM_ALLOC 0x0800
160 /* Use reserved root blocks if needed */
161 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
162 /* Use blocks from reserved pool */
163 #define EXT4_MB_USE_RESERVED 0x2000
164 /* Do strict check for free blocks while retrying block allocation */
165 #define EXT4_MB_STRICT_CHECK 0x4000
166 /* Large fragment size list lookup succeeded at least once for cr = 0 */
167 #define EXT4_MB_CR0_OPTIMIZED 0x8000
168 /* Avg fragment size rb tree lookup succeeded at least once for cr = 1 */
169 #define EXT4_MB_CR1_OPTIMIZED 0x00010000
170 struct ext4_allocation_request {
171 /* target inode for block we're allocating */
173 /* how many blocks we want to allocate */
175 /* logical block in target inode */
177 /* the closest logical allocated block to the left */
179 /* the closest logical allocated block to the right */
181 /* phys. target (a hint) */
183 /* phys. block for the closest logical allocated block to the left */
185 /* phys. block for the closest logical allocated block to the right */
187 /* flags. see above EXT4_MB_HINT_* */
192 * Logical to physical block mapping, used by ext4_map_blocks()
194 * This structure is used to pass requests into ext4_map_blocks() as
195 * well as to store the information returned by ext4_map_blocks(). It
196 * takes less room on the stack than a struct buffer_head.
198 #define EXT4_MAP_NEW BIT(BH_New)
199 #define EXT4_MAP_MAPPED BIT(BH_Mapped)
200 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
201 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
202 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
203 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
205 struct ext4_map_blocks {
209 unsigned int m_flags;
213 * Block validity checking, system zone rbtree.
215 struct ext4_system_blocks {
221 * Flags for ext4_io_end->flags
223 #define EXT4_IO_END_UNWRITTEN 0x0001
225 struct ext4_io_end_vec {
226 struct list_head list; /* list of io_end_vec */
227 loff_t offset; /* offset in the file */
228 ssize_t size; /* size of the extent */
232 * For converting unwritten extents on a work queue. 'handle' is used for
233 * buffered writeback.
235 typedef struct ext4_io_end {
236 struct list_head list; /* per-file finished IO list */
237 handle_t *handle; /* handle reserved for extent
239 struct inode *inode; /* file being written to */
240 struct bio *bio; /* Linked list of completed
241 * bios covering the extent */
242 unsigned int flag; /* unwritten or not */
243 refcount_t count; /* reference counter */
244 struct list_head list_vec; /* list of ext4_io_end_vec */
247 struct ext4_io_submit {
248 struct writeback_control *io_wbc;
250 ext4_io_end_t *io_end;
251 sector_t io_next_block;
255 * Special inodes numbers
257 #define EXT4_BAD_INO 1 /* Bad blocks inode */
258 #define EXT4_ROOT_INO 2 /* Root inode */
259 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
260 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
261 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
262 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
263 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
264 #define EXT4_JOURNAL_INO 8 /* Journal inode */
266 /* First non-reserved inode for old ext4 filesystems */
267 #define EXT4_GOOD_OLD_FIRST_INO 11
270 * Maximal count of links to a file
272 #define EXT4_LINK_MAX 65000
275 * Macro-instructions used to manage several block sizes
277 #define EXT4_MIN_BLOCK_SIZE 1024
278 #define EXT4_MAX_BLOCK_SIZE 65536
279 #define EXT4_MIN_BLOCK_LOG_SIZE 10
280 #define EXT4_MAX_BLOCK_LOG_SIZE 16
281 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
283 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
285 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
287 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
288 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
289 EXT4_SB(s)->s_cluster_bits)
291 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
292 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
294 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
297 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
298 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
299 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
301 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
302 EXT4_GOOD_OLD_INODE_SIZE : \
304 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
305 EXT4_GOOD_OLD_FIRST_INO : \
308 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
309 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
310 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
313 /* Translate a block number to a cluster number */
314 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
315 /* Translate a cluster number to a block number */
316 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
317 /* Translate # of blks to # of clusters */
318 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
319 (sbi)->s_cluster_bits)
320 /* Mask out the low bits to get the starting block of the cluster */
321 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
322 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
323 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
324 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
325 /* Fill in the low bits to get the last block of the cluster */
326 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
327 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
328 /* Get the cluster offset */
329 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
330 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
331 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
332 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
335 * Structure of a blocks group descriptor
337 struct ext4_group_desc
339 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
340 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
341 __le32 bg_inode_table_lo; /* Inodes table block */
342 __le16 bg_free_blocks_count_lo;/* Free blocks count */
343 __le16 bg_free_inodes_count_lo;/* Free inodes count */
344 __le16 bg_used_dirs_count_lo; /* Directories count */
345 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
346 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
347 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
348 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
349 __le16 bg_itable_unused_lo; /* Unused inodes count */
350 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
351 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
352 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
353 __le32 bg_inode_table_hi; /* Inodes table block MSB */
354 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
355 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
356 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
357 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
358 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
359 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
360 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
364 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
365 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
367 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
368 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
372 * Structure of a flex block group info
376 atomic64_t free_clusters;
377 atomic_t free_inodes;
381 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
382 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
383 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
386 * Macro-instructions used to manage group descriptors
388 #define EXT4_MIN_DESC_SIZE 32
389 #define EXT4_MIN_DESC_SIZE_64BIT 64
390 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
391 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
393 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
394 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
395 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
396 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
397 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
399 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
400 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
401 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
405 * Constants relative to the data blocks
407 #define EXT4_NDIR_BLOCKS 12
408 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
409 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
410 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
411 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
416 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
417 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
418 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
419 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
420 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
421 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
422 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
423 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
424 /* Reserved for compression usage... */
425 #define EXT4_DIRTY_FL 0x00000100
426 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
427 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
428 /* nb: was previously EXT2_ECOMPR_FL */
429 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
430 /* End compression flags --- maybe not all used */
431 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
432 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
433 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
434 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
435 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
436 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
437 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
438 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
439 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
440 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
441 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
443 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
445 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
446 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
447 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
448 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
450 /* User modifiable flags */
451 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
455 EXT4_IMMUTABLE_FL | \
459 EXT4_JOURNAL_DATA_FL | \
464 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
466 EXT4_PROJINHERIT_FL | \
469 /* User visible flags */
470 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
479 /* Flags that should be inherited by new inodes from their parent. */
480 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
481 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
482 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
483 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
484 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
487 /* Flags that are appropriate for regular files (all but dir-specific ones). */
488 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
489 EXT4_PROJINHERIT_FL))
491 /* Flags that are appropriate for non-directories/regular files. */
492 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
494 /* The only flags that should be swapped */
495 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
497 /* Flags which are mutually exclusive to DAX */
498 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
499 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
501 /* Mask out flags that are inappropriate for the given type of inode. */
502 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
506 else if (S_ISREG(mode))
507 return flags & EXT4_REG_FLMASK;
509 return flags & EXT4_OTHER_FLMASK;
513 * Inode flags used for atomic set/get
516 EXT4_INODE_SECRM = 0, /* Secure deletion */
517 EXT4_INODE_UNRM = 1, /* Undelete */
518 EXT4_INODE_COMPR = 2, /* Compress file */
519 EXT4_INODE_SYNC = 3, /* Synchronous updates */
520 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
521 EXT4_INODE_APPEND = 5, /* writes to file may only append */
522 EXT4_INODE_NODUMP = 6, /* do not dump file */
523 EXT4_INODE_NOATIME = 7, /* do not update atime */
524 /* Reserved for compression usage... */
525 EXT4_INODE_DIRTY = 8,
526 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
527 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
528 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
529 /* End compression flags --- maybe not all used */
530 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
531 EXT4_INODE_IMAGIC = 13, /* AFS directory */
532 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
533 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
534 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
535 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
536 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
537 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
538 EXT4_INODE_VERITY = 20, /* Verity protected inode */
539 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
540 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
541 EXT4_INODE_DAX = 25, /* Inode is DAX */
542 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
543 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
544 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
545 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
549 * Since it's pretty easy to mix up bit numbers and hex values, we use a
550 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
551 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
552 * any extra space in the compiled kernel image, otherwise, the build will fail.
553 * It's important that these values are the same, since we are using
554 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
555 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
556 * values found in ext2, ext3 and ext4 filesystems, and of course the values
557 * defined in e2fsprogs.
559 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
561 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
562 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
564 static inline void ext4_check_flag_values(void)
566 CHECK_FLAG_VALUE(SECRM);
567 CHECK_FLAG_VALUE(UNRM);
568 CHECK_FLAG_VALUE(COMPR);
569 CHECK_FLAG_VALUE(SYNC);
570 CHECK_FLAG_VALUE(IMMUTABLE);
571 CHECK_FLAG_VALUE(APPEND);
572 CHECK_FLAG_VALUE(NODUMP);
573 CHECK_FLAG_VALUE(NOATIME);
574 CHECK_FLAG_VALUE(DIRTY);
575 CHECK_FLAG_VALUE(COMPRBLK);
576 CHECK_FLAG_VALUE(NOCOMPR);
577 CHECK_FLAG_VALUE(ENCRYPT);
578 CHECK_FLAG_VALUE(INDEX);
579 CHECK_FLAG_VALUE(IMAGIC);
580 CHECK_FLAG_VALUE(JOURNAL_DATA);
581 CHECK_FLAG_VALUE(NOTAIL);
582 CHECK_FLAG_VALUE(DIRSYNC);
583 CHECK_FLAG_VALUE(TOPDIR);
584 CHECK_FLAG_VALUE(HUGE_FILE);
585 CHECK_FLAG_VALUE(EXTENTS);
586 CHECK_FLAG_VALUE(VERITY);
587 CHECK_FLAG_VALUE(EA_INODE);
588 CHECK_FLAG_VALUE(INLINE_DATA);
589 CHECK_FLAG_VALUE(PROJINHERIT);
590 CHECK_FLAG_VALUE(CASEFOLD);
591 CHECK_FLAG_VALUE(RESERVED);
594 /* Used to pass group descriptor data when online resize is done */
595 struct ext4_new_group_input {
596 __u32 group; /* Group number for this data */
597 __u64 block_bitmap; /* Absolute block number of block bitmap */
598 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
599 __u64 inode_table; /* Absolute block number of inode table start */
600 __u32 blocks_count; /* Total number of blocks in this group */
601 __u16 reserved_blocks; /* Number of reserved blocks in this group */
605 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
606 struct compat_ext4_new_group_input {
608 compat_u64 block_bitmap;
609 compat_u64 inode_bitmap;
610 compat_u64 inode_table;
617 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
618 struct ext4_new_group_data {
624 __u16 reserved_blocks;
626 __u32 free_clusters_count;
629 /* Indexes used to index group tables in ext4_new_group_data */
631 BLOCK_BITMAP = 0, /* block bitmap */
632 INODE_BITMAP, /* inode bitmap */
633 INODE_TABLE, /* inode tables */
638 * Flags used by ext4_map_blocks()
640 /* Allocate any needed blocks and/or convert an unwritten
641 extent to be an initialized ext4 */
642 #define EXT4_GET_BLOCKS_CREATE 0x0001
643 /* Request the creation of an unwritten extent */
644 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
645 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
646 EXT4_GET_BLOCKS_CREATE)
647 /* Caller is from the delayed allocation writeout path
648 * finally doing the actual allocation of delayed blocks */
649 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
650 /* caller is from the direct IO path, request to creation of an
651 unwritten extents if not allocated, split the unwritten
652 extent if blocks has been preallocated already*/
653 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
654 #define EXT4_GET_BLOCKS_CONVERT 0x0010
655 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
656 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
657 /* Convert extent to initialized after IO complete */
658 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
659 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
660 /* Eventual metadata allocation (due to growing extent tree)
661 * should not fail, so try to use reserved blocks for that.*/
662 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
663 /* Don't normalize allocation size (used for fallocate) */
664 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
665 /* Convert written extents to unwritten */
666 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
667 /* Write zeros to newly created written extents */
668 #define EXT4_GET_BLOCKS_ZERO 0x0200
669 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
670 EXT4_GET_BLOCKS_ZERO)
671 /* Caller will submit data before dropping transaction handle. This
672 * allows jbd2 to avoid submitting data before commit. */
673 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
674 /* Caller is in the atomic contex, find extent if it has been cached */
675 #define EXT4_GET_BLOCKS_CACHED_NOWAIT 0x0800
678 * The bit position of these flags must not overlap with any of the
679 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
680 * read_extent_tree_block(), ext4_split_extent_at(),
681 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
682 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
683 * caching the extents when reading from the extent tree while a
684 * truncate or punch hole operation is in progress.
686 #define EXT4_EX_NOCACHE 0x40000000
687 #define EXT4_EX_FORCE_CACHE 0x20000000
688 #define EXT4_EX_NOFAIL 0x10000000
691 * Flags used by ext4_free_blocks
693 #define EXT4_FREE_BLOCKS_METADATA 0x0001
694 #define EXT4_FREE_BLOCKS_FORGET 0x0002
695 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
696 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
697 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
698 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
699 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
704 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
705 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
706 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
707 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
708 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
709 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
710 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
711 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
712 #define EXT4_IOC_MIGRATE _IO('f', 9)
713 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
714 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
715 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
716 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
717 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
718 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
719 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
720 /* ioctl codes 19--39 are reserved for fscrypt */
721 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
722 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
723 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
724 #define EXT4_IOC_CHECKPOINT _IOW('f', 43, __u32)
726 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
729 * Flags for going down operation
731 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
732 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
733 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
736 * Flags returned by EXT4_IOC_GETSTATE
738 * We only expose to userspace a subset of the state flags in
741 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
742 #define EXT4_STATE_FLAG_NEW 0x00000002
743 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004
744 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
746 /* flags for ioctl EXT4_IOC_CHECKPOINT */
747 #define EXT4_IOC_CHECKPOINT_FLAG_DISCARD 0x1
748 #define EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT 0x2
749 #define EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN 0x4
750 #define EXT4_IOC_CHECKPOINT_FLAG_VALID (EXT4_IOC_CHECKPOINT_FLAG_DISCARD | \
751 EXT4_IOC_CHECKPOINT_FLAG_ZEROOUT | \
752 EXT4_IOC_CHECKPOINT_FLAG_DRY_RUN)
754 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
756 * ioctl commands in 32 bit emulation
758 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
759 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
760 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
761 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
762 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
763 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
764 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
765 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
769 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
770 * It indicates that the entry in extent status cache is for a hole.
772 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
774 /* Max physical block we can address w/o extents */
775 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
777 /* Max logical block we can support */
778 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
781 * Structure of an inode on the disk
784 __le16 i_mode; /* File mode */
785 __le16 i_uid; /* Low 16 bits of Owner Uid */
786 __le32 i_size_lo; /* Size in bytes */
787 __le32 i_atime; /* Access time */
788 __le32 i_ctime; /* Inode Change time */
789 __le32 i_mtime; /* Modification time */
790 __le32 i_dtime; /* Deletion Time */
791 __le16 i_gid; /* Low 16 bits of Group Id */
792 __le16 i_links_count; /* Links count */
793 __le32 i_blocks_lo; /* Blocks count */
794 __le32 i_flags; /* File flags */
800 __u32 h_i_translator;
805 } osd1; /* OS dependent 1 */
806 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
807 __le32 i_generation; /* File version (for NFS) */
808 __le32 i_file_acl_lo; /* File ACL */
810 __le32 i_obso_faddr; /* Obsoleted fragment address */
813 __le16 l_i_blocks_high; /* were l_i_reserved1 */
814 __le16 l_i_file_acl_high;
815 __le16 l_i_uid_high; /* these 2 fields */
816 __le16 l_i_gid_high; /* were reserved2[0] */
817 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
821 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
828 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
829 __le16 m_i_file_acl_high;
830 __u32 m_i_reserved2[2];
832 } osd2; /* OS dependent 2 */
833 __le16 i_extra_isize;
834 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
835 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
836 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
837 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
838 __le32 i_crtime; /* File Creation time */
839 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
840 __le32 i_version_hi; /* high 32 bits for 64-bit version */
841 __le32 i_projid; /* Project ID */
845 __u32 reserved; /* should be zero */
846 __u32 donor_fd; /* donor file descriptor */
847 __u64 orig_start; /* logical start offset in block for orig */
848 __u64 donor_start; /* logical start offset in block for donor */
849 __u64 len; /* block length to be moved */
850 __u64 moved_len; /* moved block length */
853 #define EXT4_EPOCH_BITS 2
854 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
855 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
858 * Extended fields will fit into an inode if the filesystem was formatted
859 * with large inodes (-I 256 or larger) and there are not currently any EAs
860 * consuming all of the available space. For new inodes we always reserve
861 * enough space for the kernel's known extended fields, but for inodes
862 * created with an old kernel this might not have been the case. None of
863 * the extended inode fields is critical for correct filesystem operation.
864 * This macro checks if a certain field fits in the inode. Note that
865 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
867 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
868 ((offsetof(typeof(*ext4_inode), field) + \
869 sizeof((ext4_inode)->field)) \
870 <= (EXT4_GOOD_OLD_INODE_SIZE + \
871 (einode)->i_extra_isize)) \
874 * We use an encoding that preserves the times for extra epoch "00":
876 * extra msb of adjust for signed
877 * epoch 32-bit 32-bit tv_sec to
878 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
879 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
880 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
881 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
882 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
883 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
884 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
885 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
886 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
888 * Note that previous versions of the kernel on 64-bit systems would
889 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
890 * 1970. e2fsck will correct this, assuming that it is run on the
891 * affected filesystem before 2242.
894 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
896 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
897 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
900 static inline void ext4_decode_extra_time(struct timespec64 *time,
903 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
904 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
905 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
908 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
910 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
911 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
912 (raw_inode)->xtime ## _extra = \
913 ext4_encode_extra_time(&(inode)->xtime); \
916 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
919 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
921 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
922 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
923 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
924 (raw_inode)->xtime ## _extra = \
925 ext4_encode_extra_time(&(einode)->xtime); \
928 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
930 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
931 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
932 ext4_decode_extra_time(&(inode)->xtime, \
933 raw_inode->xtime ## _extra); \
936 (inode)->xtime.tv_nsec = 0; \
940 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
942 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
943 (einode)->xtime.tv_sec = \
944 (signed)le32_to_cpu((raw_inode)->xtime); \
946 (einode)->xtime.tv_sec = 0; \
947 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
948 ext4_decode_extra_time(&(einode)->xtime, \
949 raw_inode->xtime ## _extra); \
951 (einode)->xtime.tv_nsec = 0; \
954 #define i_disk_version osd1.linux1.l_i_version
956 #if defined(__KERNEL__) || defined(__linux__)
957 #define i_reserved1 osd1.linux1.l_i_reserved1
958 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
959 #define i_blocks_high osd2.linux2.l_i_blocks_high
960 #define i_uid_low i_uid
961 #define i_gid_low i_gid
962 #define i_uid_high osd2.linux2.l_i_uid_high
963 #define i_gid_high osd2.linux2.l_i_gid_high
964 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
966 #elif defined(__GNU__)
968 #define i_translator osd1.hurd1.h_i_translator
969 #define i_uid_high osd2.hurd2.h_i_uid_high
970 #define i_gid_high osd2.hurd2.h_i_gid_high
971 #define i_author osd2.hurd2.h_i_author
973 #elif defined(__masix__)
975 #define i_reserved1 osd1.masix1.m_i_reserved1
976 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
977 #define i_reserved2 osd2.masix2.m_i_reserved2
979 #endif /* defined(__KERNEL__) || defined(__linux__) */
981 #include "extents_status.h"
982 #include "fast_commit.h"
985 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
987 * These are needed to avoid lockdep false positives when we need to
988 * allocate blocks to the quota inode during ext4_map_blocks(), while
989 * holding i_data_sem for a normal (non-quota) inode. Since we don't
990 * do quota tracking for the quota inode, this avoids deadlock (as
991 * well as infinite recursion, since it isn't turtles all the way
994 * I_DATA_SEM_NORMAL - Used for most inodes
995 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
996 * where the second inode has larger inode number
998 * I_DATA_SEM_QUOTA - Used for quota inodes only
1001 I_DATA_SEM_NORMAL = 0,
1008 * fourth extended file system inode data in memory
1010 struct ext4_inode_info {
1011 __le32 i_data[15]; /* unconverted */
1013 ext4_fsblk_t i_file_acl;
1016 * i_block_group is the number of the block group which contains
1017 * this file's inode. Constant across the lifetime of the inode,
1018 * it is used for making block allocation decisions - we try to
1019 * place a file's data blocks near its inode block, and new inodes
1020 * near to their parent directory's inode.
1022 ext4_group_t i_block_group;
1023 ext4_lblk_t i_dir_start_lookup;
1024 #if (BITS_PER_LONG < 64)
1025 unsigned long i_state_flags; /* Dynamic state flags */
1027 unsigned long i_flags;
1030 * Extended attributes can be read independently of the main file
1031 * data. Taking i_rwsem even when reading would cause contention
1032 * between readers of EAs and writers of regular file data, so
1033 * instead we synchronize on xattr_sem when reading or changing
1036 struct rw_semaphore xattr_sem;
1039 * Inodes with EXT4_STATE_ORPHAN_FILE use i_orphan_idx. Otherwise
1043 struct list_head i_orphan; /* unlinked but open inodes */
1044 unsigned int i_orphan_idx; /* Index in orphan file */
1047 /* Fast commit related info */
1049 /* For tracking dentry create updates */
1050 struct list_head i_fc_dilist;
1051 struct list_head i_fc_list; /*
1052 * inodes that need fast commit
1053 * protected by sbi->s_fc_lock.
1056 /* Start of lblk range that needs to be committed in this fast commit */
1057 ext4_lblk_t i_fc_lblk_start;
1059 /* End of lblk range that needs to be committed in this fast commit */
1060 ext4_lblk_t i_fc_lblk_len;
1062 /* Number of ongoing updates on this inode */
1063 atomic_t i_fc_updates;
1065 /* Fast commit wait queue for this inode */
1066 wait_queue_head_t i_fc_wait;
1068 /* Protect concurrent accesses on i_fc_lblk_start, i_fc_lblk_len */
1069 struct mutex i_fc_lock;
1072 * i_disksize keeps track of what the inode size is ON DISK, not
1073 * in memory. During truncate, i_size is set to the new size by
1074 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1075 * set i_disksize to 0 until the truncate is actually under way.
1077 * The intent is that i_disksize always represents the blocks which
1078 * are used by this file. This allows recovery to restart truncate
1079 * on orphans if we crash during truncate. We actually write i_disksize
1080 * into the on-disk inode when writing inodes out, instead of i_size.
1082 * The only time when i_disksize and i_size may be different is when
1083 * a truncate is in progress. The only things which change i_disksize
1084 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1089 * i_data_sem is for serialising ext4_truncate() against
1090 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1091 * data tree are chopped off during truncate. We can't do that in
1092 * ext4 because whenever we perform intermediate commits during
1093 * truncate, the inode and all the metadata blocks *must* be in a
1094 * consistent state which allows truncation of the orphans to restart
1095 * during recovery. Hence we must fix the get_block-vs-truncate race
1096 * by other means, so we have i_data_sem.
1098 struct rw_semaphore i_data_sem;
1099 struct inode vfs_inode;
1100 struct jbd2_inode *jinode;
1102 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1105 * File creation time. Its function is same as that of
1106 * struct timespec64 i_{a,c,m}time in the generic inode.
1108 struct timespec64 i_crtime;
1111 atomic_t i_prealloc_active;
1112 struct list_head i_prealloc_list;
1113 spinlock_t i_prealloc_lock;
1115 /* extents status tree */
1116 struct ext4_es_tree i_es_tree;
1118 struct list_head i_es_list;
1119 unsigned int i_es_all_nr; /* protected by i_es_lock */
1120 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1121 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1122 extents to shrink. Protected by
1126 ext4_group_t i_last_alloc_group;
1128 /* allocation reservation info for delalloc */
1129 /* In case of bigalloc, this refer to clusters rather than blocks */
1130 unsigned int i_reserved_data_blocks;
1132 /* pending cluster reservations for bigalloc file systems */
1133 struct ext4_pending_tree i_pending_tree;
1135 /* on-disk additional length */
1136 __u16 i_extra_isize;
1138 /* Indicate the inline data space. */
1143 /* quota space reservation, managed internally by quota code */
1144 qsize_t i_reserved_quota;
1147 /* Lock protecting lists below */
1148 spinlock_t i_completed_io_lock;
1150 * Completed IOs that need unwritten extents handling and have
1151 * transaction reserved
1153 struct list_head i_rsv_conversion_list;
1154 struct work_struct i_rsv_conversion_work;
1155 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1157 spinlock_t i_block_reservation_lock;
1160 * Transactions that contain inode's metadata needed to complete
1161 * fsync and fdatasync, respectively.
1164 tid_t i_datasync_tid;
1167 struct dquot *i_dquot[MAXQUOTAS];
1170 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1177 * File system states
1179 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1180 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1181 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1182 #define EXT4_FC_REPLAY 0x0020 /* Fast commit replay ongoing */
1185 * Misc. filesystem flags
1187 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1188 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1189 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1192 * Mount flags set via mount options or defaults
1194 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1195 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1196 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1197 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1198 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1199 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1200 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1201 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1202 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1203 #ifdef CONFIG_FS_DAX
1204 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1206 #define EXT4_MOUNT_DAX_ALWAYS 0
1208 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1209 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1210 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1211 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1212 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1213 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1214 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1215 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1216 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1217 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1218 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1219 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1220 * enable enforcement for hidden
1222 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1223 * enforcement for hidden quota
1225 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1227 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1228 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1229 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1230 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1231 #define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
1232 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1233 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1234 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1235 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1236 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1239 * Mount flags set either automatically (could not be set by mount option)
1240 * based on per file system feature or property or in special cases such as
1241 * distinguishing between explicit mount option definition and default.
1243 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1244 specified delalloc */
1245 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1246 size of blocksize * 8
1248 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1250 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1251 specified journal checksum */
1253 #define EXT4_MOUNT2_JOURNAL_FAST_COMMIT 0x00000010 /* Journal fast commit */
1254 #define EXT4_MOUNT2_DAX_NEVER 0x00000020 /* Do not allow Direct Access */
1255 #define EXT4_MOUNT2_DAX_INODE 0x00000040 /* For printing options only */
1256 #define EXT4_MOUNT2_MB_OPTIMIZE_SCAN 0x00000080 /* Optimize group
1257 * scanning in mballoc
1260 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1262 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1264 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1267 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1269 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1271 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1274 #define ext4_test_and_set_bit __test_and_set_bit_le
1275 #define ext4_set_bit __set_bit_le
1276 #define ext4_set_bit_atomic ext2_set_bit_atomic
1277 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1278 #define ext4_clear_bit __clear_bit_le
1279 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1280 #define ext4_test_bit test_bit_le
1281 #define ext4_find_next_zero_bit find_next_zero_bit_le
1282 #define ext4_find_next_bit find_next_bit_le
1284 extern void mb_set_bits(void *bm, int cur, int len);
1287 * Maximal mount counts between two filesystem checks
1289 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1290 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1293 * Behaviour when detecting errors
1295 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1296 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1297 #define EXT4_ERRORS_PANIC 3 /* Panic */
1298 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1300 /* Metadata checksum algorithm codes */
1301 #define EXT4_CRC32C_CHKSUM 1
1303 #define EXT4_LABEL_MAX 16
1306 * Structure of the super block
1308 struct ext4_super_block {
1309 /*00*/ __le32 s_inodes_count; /* Inodes count */
1310 __le32 s_blocks_count_lo; /* Blocks count */
1311 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1312 __le32 s_free_blocks_count_lo; /* Free blocks count */
1313 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1314 __le32 s_first_data_block; /* First Data Block */
1315 __le32 s_log_block_size; /* Block size */
1316 __le32 s_log_cluster_size; /* Allocation cluster size */
1317 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1318 __le32 s_clusters_per_group; /* # Clusters per group */
1319 __le32 s_inodes_per_group; /* # Inodes per group */
1320 __le32 s_mtime; /* Mount time */
1321 /*30*/ __le32 s_wtime; /* Write time */
1322 __le16 s_mnt_count; /* Mount count */
1323 __le16 s_max_mnt_count; /* Maximal mount count */
1324 __le16 s_magic; /* Magic signature */
1325 __le16 s_state; /* File system state */
1326 __le16 s_errors; /* Behaviour when detecting errors */
1327 __le16 s_minor_rev_level; /* minor revision level */
1328 /*40*/ __le32 s_lastcheck; /* time of last check */
1329 __le32 s_checkinterval; /* max. time between checks */
1330 __le32 s_creator_os; /* OS */
1331 __le32 s_rev_level; /* Revision level */
1332 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1333 __le16 s_def_resgid; /* Default gid for reserved blocks */
1335 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1337 * Note: the difference between the compatible feature set and
1338 * the incompatible feature set is that if there is a bit set
1339 * in the incompatible feature set that the kernel doesn't
1340 * know about, it should refuse to mount the filesystem.
1342 * e2fsck's requirements are more strict; if it doesn't know
1343 * about a feature in either the compatible or incompatible
1344 * feature set, it must abort and not try to meddle with
1345 * things it doesn't understand...
1347 __le32 s_first_ino; /* First non-reserved inode */
1348 __le16 s_inode_size; /* size of inode structure */
1349 __le16 s_block_group_nr; /* block group # of this superblock */
1350 __le32 s_feature_compat; /* compatible feature set */
1351 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1352 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1353 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1354 /*78*/ char s_volume_name[EXT4_LABEL_MAX]; /* volume name */
1355 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1356 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1358 * Performance hints. Directory preallocation should only
1359 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1361 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1362 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1363 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1365 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1367 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1368 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1369 __le32 s_journal_dev; /* device number of journal file */
1370 __le32 s_last_orphan; /* start of list of inodes to delete */
1371 __le32 s_hash_seed[4]; /* HTREE hash seed */
1372 __u8 s_def_hash_version; /* Default hash version to use */
1373 __u8 s_jnl_backup_type;
1374 __le16 s_desc_size; /* size of group descriptor */
1375 /*100*/ __le32 s_default_mount_opts;
1376 __le32 s_first_meta_bg; /* First metablock block group */
1377 __le32 s_mkfs_time; /* When the filesystem was created */
1378 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1379 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1380 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1381 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1382 __le32 s_free_blocks_count_hi; /* Free blocks count */
1383 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1384 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1385 __le32 s_flags; /* Miscellaneous flags */
1386 __le16 s_raid_stride; /* RAID stride */
1387 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1388 __le64 s_mmp_block; /* Block for multi-mount protection */
1389 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1390 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1391 __u8 s_checksum_type; /* metadata checksum algorithm used */
1392 __u8 s_encryption_level; /* versioning level for encryption */
1393 __u8 s_reserved_pad; /* Padding to next 32bits */
1394 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1395 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1396 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1397 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1398 snapshot's future use */
1399 __le32 s_snapshot_list; /* inode number of the head of the
1400 on-disk snapshot list */
1401 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1402 __le32 s_error_count; /* number of fs errors */
1403 __le32 s_first_error_time; /* first time an error happened */
1404 __le32 s_first_error_ino; /* inode involved in first error */
1405 __le64 s_first_error_block; /* block involved of first error */
1406 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1407 __le32 s_first_error_line; /* line number where error happened */
1408 __le32 s_last_error_time; /* most recent time of an error */
1409 __le32 s_last_error_ino; /* inode involved in last error */
1410 __le32 s_last_error_line; /* line number where error happened */
1411 __le64 s_last_error_block; /* block involved of last error */
1412 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1413 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1414 __u8 s_mount_opts[64];
1415 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1416 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1417 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1418 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1419 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1420 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1421 __le32 s_lpf_ino; /* Location of the lost+found inode */
1422 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1423 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1426 __u8 s_mkfs_time_hi;
1427 __u8 s_lastcheck_hi;
1428 __u8 s_first_error_time_hi;
1429 __u8 s_last_error_time_hi;
1430 __u8 s_first_error_errcode;
1431 __u8 s_last_error_errcode;
1432 __le16 s_encoding; /* Filename charset encoding */
1433 __le16 s_encoding_flags; /* Filename charset encoding flags */
1434 __le32 s_orphan_file_inum; /* Inode for tracking orphan inodes */
1435 __le32 s_reserved[94]; /* Padding to the end of the block */
1436 __le32 s_checksum; /* crc32c(superblock) */
1439 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1443 /* Number of quota types we support */
1444 #define EXT4_MAXQUOTAS 3
1446 #define EXT4_ENC_UTF8_12_1 1
1448 /* Types of ext4 journal triggers */
1449 enum ext4_journal_trigger_type {
1450 EXT4_JTR_ORPHAN_FILE,
1451 EXT4_JTR_NONE /* This must be the last entry for indexing to work! */
1454 #define EXT4_JOURNAL_TRIGGER_COUNT EXT4_JTR_NONE
1456 struct ext4_journal_trigger {
1457 struct jbd2_buffer_trigger_type tr_triggers;
1458 struct super_block *sb;
1461 static inline struct ext4_journal_trigger *EXT4_TRIGGER(
1462 struct jbd2_buffer_trigger_type *trigger)
1464 return container_of(trigger, struct ext4_journal_trigger, tr_triggers);
1467 #define EXT4_ORPHAN_BLOCK_MAGIC 0x0b10ca04
1469 /* Structure at the tail of orphan block */
1470 struct ext4_orphan_block_tail {
1475 static inline int ext4_inodes_per_orphan_block(struct super_block *sb)
1477 return (sb->s_blocksize - sizeof(struct ext4_orphan_block_tail)) /
1481 struct ext4_orphan_block {
1482 atomic_t ob_free_entries; /* Number of free orphan entries in block */
1483 struct buffer_head *ob_bh; /* Buffer for orphan block */
1487 * Info about orphan file.
1489 struct ext4_orphan_info {
1490 int of_blocks; /* Number of orphan blocks in a file */
1491 __u32 of_csum_seed; /* Checksum seed for orphan file */
1492 struct ext4_orphan_block *of_binfo; /* Array with info about orphan
1497 * fourth extended-fs super-block data in memory
1499 struct ext4_sb_info {
1500 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1501 unsigned long s_inodes_per_block;/* Number of inodes per block */
1502 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1503 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1504 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1505 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1506 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1507 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1508 ext4_group_t s_groups_count; /* Number of groups in the fs */
1509 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1510 unsigned long s_overhead; /* # of fs overhead clusters */
1511 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1512 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1513 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1514 struct buffer_head * s_sbh; /* Buffer containing the super block */
1515 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1516 struct buffer_head * __rcu *s_group_desc;
1517 unsigned int s_mount_opt;
1518 unsigned int s_mount_opt2;
1519 unsigned long s_mount_flags;
1520 unsigned int s_def_mount_opt;
1521 ext4_fsblk_t s_sb_block;
1522 atomic64_t s_resv_clusters;
1525 unsigned short s_mount_state;
1526 unsigned short s_pad;
1527 int s_addr_per_block_bits;
1528 int s_desc_per_block_bits;
1531 unsigned int s_inode_readahead_blks;
1532 unsigned int s_inode_goal;
1534 int s_def_hash_version;
1535 int s_hash_unsigned; /* 3 if hash should be unsigned, 0 if not */
1536 struct percpu_counter s_freeclusters_counter;
1537 struct percpu_counter s_freeinodes_counter;
1538 struct percpu_counter s_dirs_counter;
1539 struct percpu_counter s_dirtyclusters_counter;
1540 struct percpu_counter s_sra_exceeded_retry_limit;
1541 struct blockgroup_lock *s_blockgroup_lock;
1542 struct proc_dir_entry *s_proc;
1543 struct kobject s_kobj;
1544 struct completion s_kobj_unregister;
1545 struct super_block *s_sb;
1546 struct buffer_head *s_mmp_bh;
1549 struct journal_s *s_journal;
1550 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1551 struct mutex s_orphan_lock; /* Protects on disk list changes */
1552 struct list_head s_orphan; /* List of orphaned inodes in on disk
1554 struct ext4_orphan_info s_orphan_info;
1555 unsigned long s_commit_interval;
1556 u32 s_max_batch_time;
1557 u32 s_min_batch_time;
1558 struct block_device *s_journal_bdev;
1560 /* Names of quota files with journalled quota */
1561 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1562 int s_jquota_fmt; /* Format of quota to use */
1564 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1565 struct ext4_system_blocks __rcu *s_system_blks;
1567 #ifdef EXTENTS_STATS
1568 /* ext4 extents stats */
1569 unsigned long s_ext_min;
1570 unsigned long s_ext_max;
1571 unsigned long s_depth_max;
1572 spinlock_t s_ext_stats_lock;
1573 unsigned long s_ext_blocks;
1574 unsigned long s_ext_extents;
1577 /* for buddy allocator */
1578 struct ext4_group_info ** __rcu *s_group_info;
1579 struct inode *s_buddy_cache;
1580 spinlock_t s_md_lock;
1581 unsigned short *s_mb_offsets;
1582 unsigned int *s_mb_maxs;
1583 unsigned int s_group_info_size;
1584 unsigned int s_mb_free_pending;
1585 struct list_head s_freed_data_list; /* List of blocks to be freed
1586 after commit completed */
1587 struct list_head s_discard_list;
1588 struct work_struct s_discard_work;
1589 atomic_t s_retry_alloc_pending;
1590 struct list_head *s_mb_avg_fragment_size;
1591 rwlock_t *s_mb_avg_fragment_size_locks;
1592 struct list_head *s_mb_largest_free_orders;
1593 rwlock_t *s_mb_largest_free_orders_locks;
1596 unsigned long s_stripe;
1597 unsigned int s_mb_max_linear_groups;
1598 unsigned int s_mb_stream_request;
1599 unsigned int s_mb_max_to_scan;
1600 unsigned int s_mb_min_to_scan;
1601 unsigned int s_mb_stats;
1602 unsigned int s_mb_order2_reqs;
1603 unsigned int s_mb_group_prealloc;
1604 unsigned int s_mb_max_inode_prealloc;
1605 unsigned int s_max_dir_size_kb;
1606 /* where last allocation was done - for stream allocation */
1607 unsigned long s_mb_last_group;
1608 unsigned long s_mb_last_start;
1609 unsigned int s_mb_prefetch;
1610 unsigned int s_mb_prefetch_limit;
1612 /* stats for buddy allocator */
1613 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1614 atomic_t s_bal_success; /* we found long enough chunks */
1615 atomic_t s_bal_allocated; /* in blocks */
1616 atomic_t s_bal_ex_scanned; /* total extents scanned */
1617 atomic_t s_bal_groups_scanned; /* number of groups scanned */
1618 atomic_t s_bal_goals; /* goal hits */
1619 atomic_t s_bal_breaks; /* too long searches */
1620 atomic_t s_bal_2orders; /* 2^order hits */
1621 atomic_t s_bal_cr0_bad_suggestions;
1622 atomic_t s_bal_cr1_bad_suggestions;
1623 atomic64_t s_bal_cX_groups_considered[4];
1624 atomic64_t s_bal_cX_hits[4];
1625 atomic64_t s_bal_cX_failed[4]; /* cX loop didn't find blocks */
1626 atomic_t s_mb_buddies_generated; /* number of buddies generated */
1627 atomic64_t s_mb_generation_time;
1628 atomic_t s_mb_lost_chunks;
1629 atomic_t s_mb_preallocated;
1630 atomic_t s_mb_discarded;
1631 atomic_t s_lock_busy;
1633 /* locality groups */
1634 struct ext4_locality_group __percpu *s_locality_groups;
1636 /* for write statistics */
1637 unsigned long s_sectors_written_start;
1638 u64 s_kbytes_written;
1640 /* the size of zero-out chunk */
1641 unsigned int s_extent_max_zeroout_kb;
1643 unsigned int s_log_groups_per_flex;
1644 struct flex_groups * __rcu *s_flex_groups;
1645 ext4_group_t s_flex_groups_allocated;
1647 /* workqueue for reserved extent conversions (buffered io) */
1648 struct workqueue_struct *rsv_conversion_wq;
1650 /* timer for periodic error stats printing */
1651 struct timer_list s_err_report;
1653 /* Lazy inode table initialization info */
1654 struct ext4_li_request *s_li_request;
1655 /* Wait multiplier for lazy initialization thread */
1656 unsigned int s_li_wait_mult;
1658 /* Kernel thread for multiple mount protection */
1659 struct task_struct *s_mmp_tsk;
1661 /* record the last minlen when FITRIM is called. */
1662 unsigned long s_last_trim_minblks;
1664 /* Reference to checksum algorithm driver via cryptoapi */
1665 struct crypto_shash *s_chksum_driver;
1667 /* Precomputed FS UUID checksum for seeding other checksums */
1670 /* Reclaim extents from extent status tree */
1671 struct shrinker s_es_shrinker;
1672 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1674 struct ext4_es_stats s_es_stats;
1675 struct mb_cache *s_ea_block_cache;
1676 struct mb_cache *s_ea_inode_cache;
1677 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1679 /* Journal triggers for checksum computation */
1680 struct ext4_journal_trigger s_journal_triggers[EXT4_JOURNAL_TRIGGER_COUNT];
1682 /* Ratelimit ext4 messages. */
1683 struct ratelimit_state s_err_ratelimit_state;
1684 struct ratelimit_state s_warning_ratelimit_state;
1685 struct ratelimit_state s_msg_ratelimit_state;
1686 atomic_t s_warning_count;
1687 atomic_t s_msg_count;
1689 /* Encryption policy for '-o test_dummy_encryption' */
1690 struct fscrypt_dummy_policy s_dummy_enc_policy;
1693 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1696 struct percpu_rw_semaphore s_writepages_rwsem;
1697 struct dax_device *s_daxdev;
1699 #ifdef CONFIG_EXT4_DEBUG
1700 unsigned long s_simulate_fail;
1702 /* Record the errseq of the backing block device */
1703 errseq_t s_bdev_wb_err;
1704 spinlock_t s_bdev_wb_lock;
1706 /* Information about errors that happened during this mount */
1707 spinlock_t s_error_lock;
1708 int s_add_error_count;
1709 int s_first_error_code;
1710 __u32 s_first_error_line;
1711 __u32 s_first_error_ino;
1712 __u64 s_first_error_block;
1713 const char *s_first_error_func;
1714 time64_t s_first_error_time;
1715 int s_last_error_code;
1716 __u32 s_last_error_line;
1717 __u32 s_last_error_ino;
1718 __u64 s_last_error_block;
1719 const char *s_last_error_func;
1720 time64_t s_last_error_time;
1722 * If we are in a context where we cannot update error information in
1723 * the on-disk superblock, we queue this work to do it.
1725 struct work_struct s_error_work;
1727 /* Ext4 fast commit sub transaction ID */
1728 atomic_t s_fc_subtid;
1731 * After commit starts, the main queue gets locked, and the further
1732 * updates get added in the staging queue.
1735 #define FC_Q_STAGING 1
1736 struct list_head s_fc_q[2]; /* Inodes staged for fast commit
1737 * that have data changes in them.
1739 struct list_head s_fc_dentry_q[2]; /* directory entry updates */
1740 unsigned int s_fc_bytes;
1742 * Main fast commit lock. This lock protects accesses to the
1744 * ei->i_fc_list, s_fc_dentry_q, s_fc_q, s_fc_bytes, s_fc_bh.
1746 spinlock_t s_fc_lock;
1747 struct buffer_head *s_fc_bh;
1748 struct ext4_fc_stats s_fc_stats;
1749 tid_t s_fc_ineligible_tid;
1750 #ifdef CONFIG_EXT4_DEBUG
1751 int s_fc_debug_max_replay;
1753 struct ext4_fc_replay_state s_fc_replay_state;
1756 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1758 return sb->s_fs_info;
1760 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1762 return container_of(inode, struct ext4_inode_info, vfs_inode);
1765 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1767 return ino == EXT4_ROOT_INO ||
1768 (ino >= EXT4_FIRST_INO(sb) &&
1769 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1773 * Returns: sbi->field[index]
1774 * Used to access an array element from the following sbi fields which require
1775 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1780 #define sbi_array_rcu_deref(sbi, field, index) \
1782 typeof(*((sbi)->field)) _v; \
1784 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1785 rcu_read_unlock(); \
1790 * run-time mount flags
1793 EXT4_MF_MNTDIR_SAMPLED,
1794 EXT4_MF_FS_ABORTED, /* Fatal error detected */
1795 EXT4_MF_FC_INELIGIBLE /* Fast commit ineligible */
1798 static inline void ext4_set_mount_flag(struct super_block *sb, int bit)
1800 set_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1803 static inline void ext4_clear_mount_flag(struct super_block *sb, int bit)
1805 clear_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1808 static inline int ext4_test_mount_flag(struct super_block *sb, int bit)
1810 return test_bit(bit, &EXT4_SB(sb)->s_mount_flags);
1815 * Simulate_fail codes
1817 #define EXT4_SIM_BBITMAP_EIO 1
1818 #define EXT4_SIM_BBITMAP_CRC 2
1819 #define EXT4_SIM_IBITMAP_EIO 3
1820 #define EXT4_SIM_IBITMAP_CRC 4
1821 #define EXT4_SIM_INODE_EIO 5
1822 #define EXT4_SIM_INODE_CRC 6
1823 #define EXT4_SIM_DIRBLOCK_EIO 7
1824 #define EXT4_SIM_DIRBLOCK_CRC 8
1826 static inline bool ext4_simulate_fail(struct super_block *sb,
1829 #ifdef CONFIG_EXT4_DEBUG
1830 struct ext4_sb_info *sbi = EXT4_SB(sb);
1832 if (unlikely(sbi->s_simulate_fail == code)) {
1833 sbi->s_simulate_fail = 0;
1840 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1841 struct buffer_head *bh,
1844 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1845 clear_buffer_uptodate(bh);
1849 * Error number codes for s_{first,last}_error_errno
1851 * Linux errno numbers are architecture specific, so we need to translate
1852 * them into something which is architecture independent. We don't define
1853 * codes for all errno's; just the ones which are most likely to be the cause
1854 * of an ext4_error() call.
1856 #define EXT4_ERR_UNKNOWN 1
1857 #define EXT4_ERR_EIO 2
1858 #define EXT4_ERR_ENOMEM 3
1859 #define EXT4_ERR_EFSBADCRC 4
1860 #define EXT4_ERR_EFSCORRUPTED 5
1861 #define EXT4_ERR_ENOSPC 6
1862 #define EXT4_ERR_ENOKEY 7
1863 #define EXT4_ERR_EROFS 8
1864 #define EXT4_ERR_EFBIG 9
1865 #define EXT4_ERR_EEXIST 10
1866 #define EXT4_ERR_ERANGE 11
1867 #define EXT4_ERR_EOVERFLOW 12
1868 #define EXT4_ERR_EBUSY 13
1869 #define EXT4_ERR_ENOTDIR 14
1870 #define EXT4_ERR_ENOTEMPTY 15
1871 #define EXT4_ERR_ESHUTDOWN 16
1872 #define EXT4_ERR_EFAULT 17
1875 * Inode dynamic state flags
1878 EXT4_STATE_JDATA, /* journaled data exists */
1879 EXT4_STATE_NEW, /* inode is newly created */
1880 EXT4_STATE_XATTR, /* has in-inode xattrs */
1881 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1882 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1883 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1884 EXT4_STATE_NEWENTRY, /* File just added to dir */
1885 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1886 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1887 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1888 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1889 EXT4_STATE_FC_COMMITTING, /* Fast commit ongoing */
1890 EXT4_STATE_ORPHAN_FILE, /* Inode orphaned in orphan file */
1893 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1894 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1896 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1898 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1900 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1902 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1904 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1907 /* Add these declarations here only so that these functions can be
1908 * found by name. Otherwise, they are very hard to locate. */
1909 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1910 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1911 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1912 EXT4_INODE_BIT_FNS(flag, flags, 0)
1914 /* Add these declarations here only so that these functions can be
1915 * found by name. Otherwise, they are very hard to locate. */
1916 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1917 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1918 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1919 #if (BITS_PER_LONG < 64)
1920 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1922 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1924 (ei)->i_state_flags = 0;
1927 EXT4_INODE_BIT_FNS(state, flags, 32)
1929 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1931 /* We depend on the fact that callers will set i_flags */
1935 /* Assume that user mode programs are passing in an ext4fs superblock, not
1936 * a kernel struct super_block. This will allow us to call the feature-test
1937 * macros from user land. */
1938 #define EXT4_SB(sb) (sb)
1941 static inline bool ext4_verity_in_progress(struct inode *inode)
1943 return IS_ENABLED(CONFIG_FS_VERITY) &&
1944 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1947 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1950 * Codes for operating systems
1952 #define EXT4_OS_LINUX 0
1953 #define EXT4_OS_HURD 1
1954 #define EXT4_OS_MASIX 2
1955 #define EXT4_OS_FREEBSD 3
1956 #define EXT4_OS_LITES 4
1961 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1962 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1964 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1966 #define EXT4_GOOD_OLD_INODE_SIZE 128
1968 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1969 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1970 #define EXT4_TIMESTAMP_MIN S32_MIN
1973 * Feature set definitions
1976 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1977 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1978 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1979 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1980 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1981 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1982 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1984 * The reason why "FAST_COMMIT" is a compat feature is that, FS becomes
1985 * incompatible only if fast commit blocks are present in the FS. Since we
1986 * clear the journal (and thus the fast commit blocks), we don't mark FS as
1987 * incompatible. We also have a JBD2 incompat feature, which gets set when
1988 * there are fast commit blocks present in the journal.
1990 #define EXT4_FEATURE_COMPAT_FAST_COMMIT 0x0400
1991 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1992 #define EXT4_FEATURE_COMPAT_ORPHAN_FILE 0x1000 /* Orphan file exists */
1994 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1995 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1996 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1997 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1998 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1999 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
2000 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
2001 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
2002 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
2004 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
2005 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
2006 * all other data structures' checksums. However, the METADATA_CSUM and
2007 * GDT_CSUM bits are mutually exclusive.
2009 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
2010 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
2011 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
2012 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
2013 #define EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT 0x10000 /* Orphan file may be
2016 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
2017 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
2018 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
2019 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
2020 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
2021 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
2022 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
2023 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
2024 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
2025 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
2026 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
2027 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
2028 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
2029 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
2030 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
2031 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
2033 extern void ext4_update_dynamic_rev(struct super_block *sb);
2035 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
2036 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2038 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2039 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
2041 static inline void ext4_set_feature_##name(struct super_block *sb) \
2043 ext4_update_dynamic_rev(sb); \
2044 EXT4_SB(sb)->s_es->s_feature_compat |= \
2045 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2047 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2049 EXT4_SB(sb)->s_es->s_feature_compat &= \
2050 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
2053 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
2054 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2056 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2057 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
2059 static inline void ext4_set_feature_##name(struct super_block *sb) \
2061 ext4_update_dynamic_rev(sb); \
2062 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
2063 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2065 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2067 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
2068 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
2071 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
2072 static inline bool ext4_has_feature_##name(struct super_block *sb) \
2074 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2075 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
2077 static inline void ext4_set_feature_##name(struct super_block *sb) \
2079 ext4_update_dynamic_rev(sb); \
2080 EXT4_SB(sb)->s_es->s_feature_incompat |= \
2081 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2083 static inline void ext4_clear_feature_##name(struct super_block *sb) \
2085 EXT4_SB(sb)->s_es->s_feature_incompat &= \
2086 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
2089 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
2090 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
2091 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
2092 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
2093 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
2094 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
2095 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
2096 EXT4_FEATURE_COMPAT_FUNCS(fast_commit, FAST_COMMIT)
2097 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
2098 EXT4_FEATURE_COMPAT_FUNCS(orphan_file, ORPHAN_FILE)
2100 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
2101 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
2102 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
2103 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
2104 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
2105 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
2106 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
2107 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
2108 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
2109 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
2110 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
2111 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
2112 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
2113 EXT4_FEATURE_RO_COMPAT_FUNCS(orphan_present, ORPHAN_PRESENT)
2115 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
2116 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
2117 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
2118 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
2119 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
2120 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
2121 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
2122 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
2123 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
2124 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
2125 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
2126 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
2127 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
2128 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
2129 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
2130 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
2132 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2133 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2134 EXT4_FEATURE_INCOMPAT_META_BG)
2135 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2136 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2137 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2139 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
2140 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2141 EXT4_FEATURE_INCOMPAT_RECOVER| \
2142 EXT4_FEATURE_INCOMPAT_META_BG)
2143 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2144 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2145 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
2147 #define EXT4_FEATURE_COMPAT_SUPP (EXT4_FEATURE_COMPAT_EXT_ATTR| \
2148 EXT4_FEATURE_COMPAT_ORPHAN_FILE)
2149 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
2150 EXT4_FEATURE_INCOMPAT_RECOVER| \
2151 EXT4_FEATURE_INCOMPAT_META_BG| \
2152 EXT4_FEATURE_INCOMPAT_EXTENTS| \
2153 EXT4_FEATURE_INCOMPAT_64BIT| \
2154 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
2155 EXT4_FEATURE_INCOMPAT_EA_INODE| \
2156 EXT4_FEATURE_INCOMPAT_MMP | \
2157 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
2158 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
2159 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
2160 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
2161 EXT4_FEATURE_INCOMPAT_LARGEDIR)
2162 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
2163 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
2164 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
2165 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
2166 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
2167 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
2168 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
2169 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
2170 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
2171 EXT4_FEATURE_RO_COMPAT_QUOTA |\
2172 EXT4_FEATURE_RO_COMPAT_PROJECT |\
2173 EXT4_FEATURE_RO_COMPAT_VERITY |\
2174 EXT4_FEATURE_RO_COMPAT_ORPHAN_PRESENT)
2176 #define EXTN_FEATURE_FUNCS(ver) \
2177 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
2179 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
2180 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
2182 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2184 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2185 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2187 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2189 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2190 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2193 EXTN_FEATURE_FUNCS(2)
2194 EXTN_FEATURE_FUNCS(3)
2195 EXTN_FEATURE_FUNCS(4)
2197 static inline bool ext4_has_compat_features(struct super_block *sb)
2199 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2201 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2203 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2205 static inline bool ext4_has_incompat_features(struct super_block *sb)
2207 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2210 extern int ext4_feature_set_ok(struct super_block *sb, int readonly);
2215 #define EXT4_FLAGS_RESIZING 0
2216 #define EXT4_FLAGS_SHUTDOWN 1
2217 #define EXT4_FLAGS_BDEV_IS_DAX 2
2219 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2221 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2225 * Default values for user and/or group using reserved blocks
2227 #define EXT4_DEF_RESUID 0
2228 #define EXT4_DEF_RESGID 0
2231 * Default project ID
2233 #define EXT4_DEF_PROJID 0
2235 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2238 * Default mount options
2240 #define EXT4_DEFM_DEBUG 0x0001
2241 #define EXT4_DEFM_BSDGROUPS 0x0002
2242 #define EXT4_DEFM_XATTR_USER 0x0004
2243 #define EXT4_DEFM_ACL 0x0008
2244 #define EXT4_DEFM_UID16 0x0010
2245 #define EXT4_DEFM_JMODE 0x0060
2246 #define EXT4_DEFM_JMODE_DATA 0x0020
2247 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2248 #define EXT4_DEFM_JMODE_WBACK 0x0060
2249 #define EXT4_DEFM_NOBARRIER 0x0100
2250 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2251 #define EXT4_DEFM_DISCARD 0x0400
2252 #define EXT4_DEFM_NODELALLOC 0x0800
2255 * Default journal batch times
2257 #define EXT4_DEF_MIN_BATCH_TIME 0
2258 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2261 * Minimum number of groups in a flexgroup before we separate out
2262 * directories into the first block group of a flexgroup
2264 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2267 * Structure of a directory entry
2269 #define EXT4_NAME_LEN 255
2271 * Base length of the ext4 directory entry excluding the name length
2273 #define EXT4_BASE_DIR_LEN (sizeof(struct ext4_dir_entry_2) - EXT4_NAME_LEN)
2275 struct ext4_dir_entry {
2276 __le32 inode; /* Inode number */
2277 __le16 rec_len; /* Directory entry length */
2278 __le16 name_len; /* Name length */
2279 char name[EXT4_NAME_LEN]; /* File name */
2284 * Encrypted Casefolded entries require saving the hash on disk. This structure
2285 * followed ext4_dir_entry_2's name[name_len] at the next 4 byte aligned
2288 struct ext4_dir_entry_hash {
2294 * The new version of the directory entry. Since EXT4 structures are
2295 * stored in intel byte order, and the name_len field could never be
2296 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2299 struct ext4_dir_entry_2 {
2300 __le32 inode; /* Inode number */
2301 __le16 rec_len; /* Directory entry length */
2302 __u8 name_len; /* Name length */
2303 __u8 file_type; /* See file type macros EXT4_FT_* below */
2304 char name[EXT4_NAME_LEN]; /* File name */
2308 * Access the hashes at the end of ext4_dir_entry_2
2310 #define EXT4_DIRENT_HASHES(entry) \
2311 ((struct ext4_dir_entry_hash *) \
2312 (((void *)(entry)) + \
2313 ((8 + (entry)->name_len + EXT4_DIR_ROUND) & ~EXT4_DIR_ROUND)))
2314 #define EXT4_DIRENT_HASH(entry) le32_to_cpu(EXT4_DIRENT_HASHES(de)->hash)
2315 #define EXT4_DIRENT_MINOR_HASH(entry) \
2316 le32_to_cpu(EXT4_DIRENT_HASHES(de)->minor_hash)
2318 static inline bool ext4_hash_in_dirent(const struct inode *inode)
2320 return IS_CASEFOLDED(inode) && IS_ENCRYPTED(inode);
2324 * This is a bogus directory entry at the end of each leaf block that
2325 * records checksums.
2327 struct ext4_dir_entry_tail {
2328 __le32 det_reserved_zero1; /* Pretend to be unused */
2329 __le16 det_rec_len; /* 12 */
2330 __u8 det_reserved_zero2; /* Zero name length */
2331 __u8 det_reserved_ft; /* 0xDE, fake file type */
2332 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2335 #define EXT4_DIRENT_TAIL(block, blocksize) \
2336 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2338 sizeof(struct ext4_dir_entry_tail))))
2341 * Ext4 directory file types. Only the low 3 bits are used. The
2342 * other bits are reserved for now.
2344 #define EXT4_FT_UNKNOWN 0
2345 #define EXT4_FT_REG_FILE 1
2346 #define EXT4_FT_DIR 2
2347 #define EXT4_FT_CHRDEV 3
2348 #define EXT4_FT_BLKDEV 4
2349 #define EXT4_FT_FIFO 5
2350 #define EXT4_FT_SOCK 6
2351 #define EXT4_FT_SYMLINK 7
2353 #define EXT4_FT_MAX 8
2355 #define EXT4_FT_DIR_CSUM 0xDE
2358 * EXT4_DIR_PAD defines the directory entries boundaries
2360 * NOTE: It must be a multiple of 4
2362 #define EXT4_DIR_PAD 4
2363 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2364 #define EXT4_MAX_REC_LEN ((1<<16)-1)
2367 * The rec_len is dependent on the type of directory. Directories that are
2368 * casefolded and encrypted need to store the hash as well, so we add room for
2369 * ext4_extended_dir_entry_2. For all entries related to '.' or '..' you should
2370 * pass NULL for dir, as those entries do not use the extra fields.
2372 static inline unsigned int ext4_dir_rec_len(__u8 name_len,
2373 const struct inode *dir)
2375 int rec_len = (name_len + 8 + EXT4_DIR_ROUND);
2377 if (dir && ext4_hash_in_dirent(dir))
2378 rec_len += sizeof(struct ext4_dir_entry_hash);
2379 return (rec_len & ~EXT4_DIR_ROUND);
2383 * If we ever get support for fs block sizes > page_size, we'll need
2384 * to remove the #if statements in the next two functions...
2386 static inline unsigned int
2387 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2389 unsigned len = le16_to_cpu(dlen);
2391 #if (PAGE_SIZE >= 65536)
2392 if (len == EXT4_MAX_REC_LEN || len == 0)
2394 return (len & 65532) | ((len & 3) << 16);
2400 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2402 BUG_ON((len > blocksize) || (blocksize > (1 << 18)) || (len & 3));
2403 #if (PAGE_SIZE >= 65536)
2405 return cpu_to_le16(len);
2406 if (len == blocksize) {
2407 if (blocksize == 65536)
2408 return cpu_to_le16(EXT4_MAX_REC_LEN);
2410 return cpu_to_le16(0);
2412 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2414 return cpu_to_le16(len);
2419 * Hash Tree Directory indexing
2420 * (c) Daniel Phillips, 2001
2423 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2424 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2425 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2426 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2427 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2429 /* Legal values for the dx_root hash_version field: */
2431 #define DX_HASH_LEGACY 0
2432 #define DX_HASH_HALF_MD4 1
2433 #define DX_HASH_TEA 2
2434 #define DX_HASH_LEGACY_UNSIGNED 3
2435 #define DX_HASH_HALF_MD4_UNSIGNED 4
2436 #define DX_HASH_TEA_UNSIGNED 5
2437 #define DX_HASH_SIPHASH 6
2439 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2440 const void *address, unsigned int length)
2443 struct shash_desc shash;
2447 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2449 desc.shash.tfm = sbi->s_chksum_driver;
2450 *(u32 *)desc.ctx = crc;
2452 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2454 return *(u32 *)desc.ctx;
2459 /* hash info structure used by the directory hash */
2469 /* 32 and 64 bit signed EOF for dx directories */
2470 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2471 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2475 * Control parameters used by ext4_htree_next_block
2477 #define HASH_NB_ALWAYS 1
2479 struct ext4_filename {
2480 const struct qstr *usr_fname;
2481 struct fscrypt_str disk_name;
2482 struct dx_hash_info hinfo;
2483 #ifdef CONFIG_FS_ENCRYPTION
2484 struct fscrypt_str crypto_buf;
2486 #if IS_ENABLED(CONFIG_UNICODE)
2487 struct fscrypt_str cf_name;
2491 #define fname_name(p) ((p)->disk_name.name)
2492 #define fname_usr_name(p) ((p)->usr_fname->name)
2493 #define fname_len(p) ((p)->disk_name.len)
2496 * Describe an inode's exact location on disk and in memory
2500 struct buffer_head *bh;
2501 unsigned long offset;
2502 ext4_group_t block_group;
2505 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2507 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2510 static inline bool ext4_is_quota_file(struct inode *inode)
2512 return IS_NOQUOTA(inode) &&
2513 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2517 * This structure is stuffed into the struct file's private_data field
2518 * for directories. It is where we put information so that we can do
2519 * readdir operations in hash tree order.
2521 struct dir_private_info {
2522 struct rb_root root;
2523 struct rb_node *curr_node;
2524 struct fname *extra_fname;
2527 __u32 curr_minor_hash;
2531 /* calculate the first block number of the group */
2532 static inline ext4_fsblk_t
2533 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2535 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2536 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2540 * Special error return code only used by dx_probe() and its callers.
2542 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2544 /* htree levels for ext4 */
2545 #define EXT4_HTREE_LEVEL_COMPAT 2
2546 #define EXT4_HTREE_LEVEL 3
2548 static inline int ext4_dir_htree_level(struct super_block *sb)
2550 return ext4_has_feature_largedir(sb) ?
2551 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2555 * Timeout and state flag for lazy initialization inode thread.
2557 #define EXT4_DEF_LI_WAIT_MULT 10
2558 #define EXT4_DEF_LI_MAX_START_DELAY 5
2559 #define EXT4_LAZYINIT_QUIT 0x0001
2560 #define EXT4_LAZYINIT_RUNNING 0x0002
2563 * Lazy inode table initialization info
2565 struct ext4_lazy_init {
2566 unsigned long li_state;
2567 struct list_head li_request_list;
2568 struct mutex li_list_mtx;
2572 EXT4_LI_MODE_PREFETCH_BBITMAP,
2573 EXT4_LI_MODE_ITABLE,
2576 struct ext4_li_request {
2577 struct super_block *lr_super;
2578 enum ext4_li_mode lr_mode;
2579 ext4_group_t lr_first_not_zeroed;
2580 ext4_group_t lr_next_group;
2581 struct list_head lr_request;
2582 unsigned long lr_next_sched;
2583 unsigned long lr_timeout;
2586 struct ext4_features {
2587 struct kobject f_kobj;
2588 struct completion f_kobj_unregister;
2592 * This structure will be used for multiple mount protection. It will be
2593 * written into the block number saved in the s_mmp_block field in the
2594 * superblock. Programs that check MMP should assume that if
2595 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2596 * to use the filesystem, regardless of how old the timestamp is.
2598 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2599 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2600 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2601 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2604 __le32 mmp_magic; /* Magic number for MMP */
2605 __le32 mmp_seq; /* Sequence no. updated periodically */
2608 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2609 * purposes and do not affect the correctness of the algorithm
2611 __le64 mmp_time; /* Time last updated */
2612 char mmp_nodename[64]; /* Node which last updated MMP block */
2613 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2616 * mmp_check_interval is used to verify if the MMP block has been
2617 * updated on the block device. The value is updated based on the
2618 * maximum time to write the MMP block during an update cycle.
2620 __le16 mmp_check_interval;
2623 __le32 mmp_pad2[226];
2624 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2627 /* arguments passed to the mmp thread */
2629 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2630 struct super_block *sb; /* super block of the fs */
2634 * Check interval multiplier
2635 * The MMP block is written every update interval and initially checked every
2636 * update interval x the multiplier (the value is then adapted based on the
2637 * write latency). The reason is that writes can be delayed under load and we
2638 * don't want readers to incorrectly assume that the filesystem is no longer
2641 #define EXT4_MMP_CHECK_MULT 2UL
2644 * Minimum interval for MMP checking in seconds.
2646 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2649 * Maximum interval for MMP checking in seconds.
2651 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2654 * Function prototypes
2658 * Ok, these declarations are also in <linux/kernel.h> but none of the
2659 * ext4 source programs needs to include it so they are duplicated here.
2661 # define NORET_TYPE /**/
2662 # define ATTRIB_NORET __attribute__((noreturn))
2663 # define NORET_AND noreturn,
2666 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2667 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2668 struct ext4_group_desc *gdp,
2669 struct buffer_head *bh, int sz);
2670 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2671 struct ext4_group_desc *gdp,
2672 struct buffer_head *bh, int sz);
2673 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2674 struct ext4_group_desc *gdp,
2675 struct buffer_head *bh);
2676 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2677 struct ext4_group_desc *gdp,
2678 struct buffer_head *bh);
2681 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2682 ext4_fsblk_t blocknr,
2683 ext4_group_t *blockgrpp,
2684 ext4_grpblk_t *offsetp);
2685 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2686 ext4_fsblk_t block);
2688 extern unsigned int ext4_block_group(struct super_block *sb,
2689 ext4_fsblk_t blocknr);
2690 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2691 ext4_fsblk_t blocknr);
2692 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2693 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2694 ext4_group_t group);
2695 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2698 unsigned long *count,
2700 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2701 s64 nclusters, unsigned int flags);
2702 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2703 extern void ext4_check_blocks_bitmap(struct super_block *);
2704 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2705 ext4_group_t block_group,
2706 struct buffer_head ** bh);
2707 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2709 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2710 ext4_group_t block_group,
2711 bool ignore_locked);
2712 extern int ext4_wait_block_bitmap(struct super_block *sb,
2713 ext4_group_t block_group,
2714 struct buffer_head *bh);
2715 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2716 ext4_group_t block_group);
2717 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2718 ext4_group_t block_group,
2719 struct ext4_group_desc *gdp);
2720 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2722 #if IS_ENABLED(CONFIG_UNICODE)
2723 extern int ext4_fname_setup_ci_filename(struct inode *dir,
2724 const struct qstr *iname,
2725 struct ext4_filename *fname);
2728 /* ext4 encryption related stuff goes here crypto.c */
2729 #ifdef CONFIG_FS_ENCRYPTION
2730 extern const struct fscrypt_operations ext4_cryptops;
2732 int ext4_fname_setup_filename(struct inode *dir, const struct qstr *iname,
2733 int lookup, struct ext4_filename *fname);
2735 int ext4_fname_prepare_lookup(struct inode *dir, struct dentry *dentry,
2736 struct ext4_filename *fname);
2738 void ext4_fname_free_filename(struct ext4_filename *fname);
2740 int ext4_ioctl_get_encryption_pwsalt(struct file *filp, void __user *arg);
2742 #else /* !CONFIG_FS_ENCRYPTION */
2743 static inline int ext4_fname_setup_filename(struct inode *dir,
2744 const struct qstr *iname,
2746 struct ext4_filename *fname)
2749 fname->usr_fname = iname;
2750 fname->disk_name.name = (unsigned char *) iname->name;
2751 fname->disk_name.len = iname->len;
2753 #if IS_ENABLED(CONFIG_UNICODE)
2754 err = ext4_fname_setup_ci_filename(dir, iname, fname);
2760 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2761 struct dentry *dentry,
2762 struct ext4_filename *fname)
2764 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2767 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2769 #if IS_ENABLED(CONFIG_UNICODE)
2770 kfree(fname->cf_name.name);
2771 fname->cf_name.name = NULL;
2775 static inline int ext4_ioctl_get_encryption_pwsalt(struct file *filp,
2780 #endif /* !CONFIG_FS_ENCRYPTION */
2783 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2785 struct ext4_dir_entry_2 *,
2786 struct buffer_head *, char *, int,
2788 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2789 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2790 (de), (bh), (buf), (size), (offset)))
2791 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2793 struct ext4_dir_entry_2 *dirent,
2794 struct fscrypt_str *ent_name);
2795 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2796 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2797 struct buffer_head *bh,
2798 void *buf, int buf_size,
2799 struct ext4_filename *fname,
2800 struct ext4_dir_entry_2 **dest_de);
2801 void ext4_insert_dentry(struct inode *dir, struct inode *inode,
2802 struct ext4_dir_entry_2 *de,
2804 struct ext4_filename *fname);
2805 static inline void ext4_update_dx_flag(struct inode *inode)
2807 if (!ext4_has_feature_dir_index(inode->i_sb) &&
2808 ext4_test_inode_flag(inode, EXT4_INODE_INDEX)) {
2809 /* ext4_iget() should have caught this... */
2810 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2811 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2814 static const unsigned char ext4_filetype_table[] = {
2815 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2818 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2820 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2823 return ext4_filetype_table[filetype];
2825 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2826 void *buf, int buf_size);
2829 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2832 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2833 struct dx_hash_info *hinfo);
2836 extern int ext4_mark_inode_used(struct super_block *sb, int ino);
2837 extern struct inode *__ext4_new_inode(struct user_namespace *, handle_t *,
2838 struct inode *, umode_t,
2839 const struct qstr *qstr, __u32 goal,
2840 uid_t *owner, __u32 i_flags,
2841 int handle_type, unsigned int line_no,
2844 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2845 __ext4_new_inode(&init_user_ns, (handle), (dir), (mode), (qstr), \
2846 (goal), (owner), i_flags, 0, 0, 0)
2847 #define ext4_new_inode_start_handle(mnt_userns, dir, mode, qstr, goal, owner, \
2849 __ext4_new_inode((mnt_userns), NULL, (dir), (mode), (qstr), (goal), (owner), \
2850 0, (type), __LINE__, (nblocks))
2853 extern void ext4_free_inode(handle_t *, struct inode *);
2854 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2855 extern unsigned long ext4_count_free_inodes(struct super_block *);
2856 extern unsigned long ext4_count_dirs(struct super_block *);
2857 extern void ext4_check_inodes_bitmap(struct super_block *);
2858 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2859 extern int ext4_init_inode_table(struct super_block *sb,
2860 ext4_group_t group, int barrier);
2861 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2864 int ext4_fc_info_show(struct seq_file *seq, void *v);
2865 void ext4_fc_init(struct super_block *sb, journal_t *journal);
2866 void ext4_fc_init_inode(struct inode *inode);
2867 void ext4_fc_track_range(handle_t *handle, struct inode *inode, ext4_lblk_t start,
2869 void __ext4_fc_track_unlink(handle_t *handle, struct inode *inode,
2870 struct dentry *dentry);
2871 void __ext4_fc_track_link(handle_t *handle, struct inode *inode,
2872 struct dentry *dentry);
2873 void ext4_fc_track_unlink(handle_t *handle, struct dentry *dentry);
2874 void ext4_fc_track_link(handle_t *handle, struct dentry *dentry);
2875 void __ext4_fc_track_create(handle_t *handle, struct inode *inode,
2876 struct dentry *dentry);
2877 void ext4_fc_track_create(handle_t *handle, struct dentry *dentry);
2878 void ext4_fc_track_inode(handle_t *handle, struct inode *inode);
2879 void ext4_fc_mark_ineligible(struct super_block *sb, int reason, handle_t *handle);
2880 void ext4_fc_start_update(struct inode *inode);
2881 void ext4_fc_stop_update(struct inode *inode);
2882 void ext4_fc_del(struct inode *inode);
2883 bool ext4_fc_replay_check_excluded(struct super_block *sb, ext4_fsblk_t block);
2884 void ext4_fc_replay_cleanup(struct super_block *sb);
2885 int ext4_fc_commit(journal_t *journal, tid_t commit_tid);
2886 int __init ext4_fc_init_dentry_cache(void);
2887 void ext4_fc_destroy_dentry_cache(void);
2888 int ext4_fc_record_regions(struct super_block *sb, int ino,
2889 ext4_lblk_t lblk, ext4_fsblk_t pblk,
2890 int len, int replay);
2893 extern const struct seq_operations ext4_mb_seq_groups_ops;
2894 extern const struct seq_operations ext4_mb_seq_structs_summary_ops;
2895 extern long ext4_mb_stats;
2896 extern long ext4_mb_max_to_scan;
2897 extern int ext4_seq_mb_stats_show(struct seq_file *seq, void *offset);
2898 extern int ext4_mb_init(struct super_block *);
2899 extern int ext4_mb_release(struct super_block *);
2900 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2901 struct ext4_allocation_request *, int *);
2902 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2903 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2904 extern int __init ext4_init_mballoc(void);
2905 extern void ext4_exit_mballoc(void);
2906 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2908 unsigned int nr, int *cnt);
2909 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2912 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2913 struct buffer_head *bh, ext4_fsblk_t block,
2914 unsigned long count, int flags);
2915 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2916 ext4_group_t ngroups);
2917 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2918 ext4_group_t i, struct ext4_group_desc *desc);
2919 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2920 ext4_fsblk_t block, unsigned long count);
2921 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2922 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2923 extern void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
2924 int len, int state);
2927 void ext4_inode_csum_set(struct inode *inode, struct ext4_inode *raw,
2928 struct ext4_inode_info *ei);
2929 int ext4_inode_is_fast_symlink(struct inode *inode);
2930 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2931 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2932 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2933 bool wait, struct buffer_head **bhs);
2934 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2935 struct buffer_head *bh_result, int create);
2936 int ext4_get_block(struct inode *inode, sector_t iblock,
2937 struct buffer_head *bh_result, int create);
2938 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2939 struct buffer_head *bh, int create);
2940 int ext4_walk_page_buffers(handle_t *handle,
2941 struct inode *inode,
2942 struct buffer_head *head,
2946 int (*fn)(handle_t *handle, struct inode *inode,
2947 struct buffer_head *bh));
2948 int do_journal_get_write_access(handle_t *handle, struct inode *inode,
2949 struct buffer_head *bh);
2950 #define FALL_BACK_TO_NONDELALLOC 1
2951 #define CONVERT_INLINE_DATA 2
2954 EXT4_IGET_NORMAL = 0,
2955 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2956 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2959 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2960 ext4_iget_flags flags, const char *function,
2963 #define ext4_iget(sb, ino, flags) \
2964 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2966 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2967 extern int ext4_setattr(struct user_namespace *, struct dentry *,
2969 extern int ext4_getattr(struct user_namespace *, const struct path *,
2970 struct kstat *, u32, unsigned int);
2971 extern void ext4_evict_inode(struct inode *);
2972 extern void ext4_clear_inode(struct inode *);
2973 extern int ext4_file_getattr(struct user_namespace *, const struct path *,
2974 struct kstat *, u32, unsigned int);
2975 extern int ext4_sync_inode(handle_t *, struct inode *);
2976 extern void ext4_dirty_inode(struct inode *, int);
2977 extern int ext4_change_inode_journal_flag(struct inode *, int);
2978 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2979 extern int ext4_get_fc_inode_loc(struct super_block *sb, unsigned long ino,
2980 struct ext4_iloc *iloc);
2981 extern int ext4_inode_attach_jinode(struct inode *inode);
2982 extern int ext4_can_truncate(struct inode *inode);
2983 extern int ext4_truncate(struct inode *);
2984 extern int ext4_break_layouts(struct inode *);
2985 extern int ext4_punch_hole(struct file *file, loff_t offset, loff_t length);
2986 extern void ext4_set_inode_flags(struct inode *, bool init);
2987 extern int ext4_alloc_da_blocks(struct inode *inode);
2988 extern void ext4_set_aops(struct inode *inode);
2989 extern int ext4_writepage_trans_blocks(struct inode *);
2990 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2991 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2992 loff_t lstart, loff_t lend);
2993 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2994 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2995 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2996 extern void ext4_da_release_space(struct inode *inode, int to_free);
2997 extern void ext4_da_update_reserve_space(struct inode *inode,
2998 int used, int quota_claim);
2999 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
3000 ext4_fsblk_t pblk, ext4_lblk_t len);
3003 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
3004 struct ext4_map_blocks *map, int flags);
3005 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
3006 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
3007 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
3008 ext4_lblk_t start, ext4_lblk_t end);
3011 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
3012 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
3013 int ext4_fileattr_set(struct user_namespace *mnt_userns,
3014 struct dentry *dentry, struct fileattr *fa);
3015 int ext4_fileattr_get(struct dentry *dentry, struct fileattr *fa);
3016 extern void ext4_reset_inode_seed(struct inode *inode);
3017 int ext4_update_overhead(struct super_block *sb);
3020 extern int ext4_ext_migrate(struct inode *);
3021 extern int ext4_ind_migrate(struct inode *inode);
3024 extern int ext4_init_new_dir(handle_t *handle, struct inode *dir,
3025 struct inode *inode);
3026 extern int ext4_dirblock_csum_verify(struct inode *inode,
3027 struct buffer_head *bh);
3028 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
3029 __u32 start_minor_hash, __u32 *next_hash);
3030 extern int ext4_search_dir(struct buffer_head *bh,
3034 struct ext4_filename *fname,
3035 unsigned int offset,
3036 struct ext4_dir_entry_2 **res_dir);
3037 extern int ext4_generic_delete_entry(struct inode *dir,
3038 struct ext4_dir_entry_2 *de_del,
3039 struct buffer_head *bh,
3043 extern bool ext4_empty_dir(struct inode *inode);
3046 extern void ext4_kvfree_array_rcu(void *to_free);
3047 extern int ext4_group_add(struct super_block *sb,
3048 struct ext4_new_group_data *input);
3049 extern int ext4_group_extend(struct super_block *sb,
3050 struct ext4_super_block *es,
3051 ext4_fsblk_t n_blocks_count);
3052 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
3053 extern unsigned int ext4_list_backups(struct super_block *sb,
3054 unsigned int *three, unsigned int *five,
3055 unsigned int *seven);
3058 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
3059 sector_t block, int op_flags);
3060 extern struct buffer_head *ext4_sb_bread_unmovable(struct super_block *sb,
3062 extern void ext4_read_bh_nowait(struct buffer_head *bh, int op_flags,
3063 bh_end_io_t *end_io);
3064 extern int ext4_read_bh(struct buffer_head *bh, int op_flags,
3065 bh_end_io_t *end_io);
3066 extern int ext4_read_bh_lock(struct buffer_head *bh, int op_flags, bool wait);
3067 extern void ext4_sb_breadahead_unmovable(struct super_block *sb, sector_t block);
3068 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
3069 extern int ext4_calculate_overhead(struct super_block *sb);
3070 extern __le32 ext4_superblock_csum(struct super_block *sb,
3071 struct ext4_super_block *es);
3072 extern void ext4_superblock_csum_set(struct super_block *sb);
3073 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
3074 ext4_group_t ngroup);
3075 extern const char *ext4_decode_error(struct super_block *sb, int errno,
3077 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
3078 ext4_group_t block_group,
3079 unsigned int flags);
3081 extern __printf(7, 8)
3082 void __ext4_error(struct super_block *, const char *, unsigned int, bool,
3083 int, __u64, const char *, ...);
3084 extern __printf(6, 7)
3085 void __ext4_error_inode(struct inode *, const char *, unsigned int,
3086 ext4_fsblk_t, int, const char *, ...);
3087 extern __printf(5, 6)
3088 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
3090 extern void __ext4_std_error(struct super_block *, const char *,
3092 extern __printf(4, 5)
3093 void __ext4_warning(struct super_block *, const char *, unsigned int,
3095 extern __printf(4, 5)
3096 void __ext4_warning_inode(const struct inode *inode, const char *function,
3097 unsigned int line, const char *fmt, ...);
3098 extern __printf(3, 4)
3099 void __ext4_msg(struct super_block *, const char *, const char *, ...);
3100 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
3101 const char *, unsigned int, const char *);
3102 extern __printf(7, 8)
3103 void __ext4_grp_locked_error(const char *, unsigned int,
3104 struct super_block *, ext4_group_t,
3105 unsigned long, ext4_fsblk_t,
3108 #define EXT4_ERROR_INODE(inode, fmt, a...) \
3109 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
3111 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
3112 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
3114 #define ext4_error_inode_block(inode, block, err, fmt, a...) \
3115 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
3118 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
3119 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
3121 #define ext4_abort(sb, err, fmt, a...) \
3122 __ext4_error((sb), __func__, __LINE__, true, (err), 0, (fmt), ## a)
3124 #ifdef CONFIG_PRINTK
3126 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3127 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
3128 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3129 __ext4_error_inode((inode), (func), (line), (block), \
3130 (err), (fmt), ##__VA_ARGS__)
3131 #define ext4_error_file(file, func, line, block, fmt, ...) \
3132 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
3133 #define ext4_error(sb, fmt, ...) \
3134 __ext4_error((sb), __func__, __LINE__, false, 0, 0, (fmt), \
3136 #define ext4_error_err(sb, err, fmt, ...) \
3137 __ext4_error((sb), __func__, __LINE__, false, (err), 0, (fmt), \
3139 #define ext4_warning(sb, fmt, ...) \
3140 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
3141 #define ext4_warning_inode(inode, fmt, ...) \
3142 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
3143 #define ext4_msg(sb, level, fmt, ...) \
3144 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
3145 #define dump_mmp_msg(sb, mmp, msg) \
3146 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
3147 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3148 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
3153 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
3155 no_printk(fmt, ##__VA_ARGS__); \
3156 __ext4_error_inode(inode, "", 0, block, 0, " "); \
3158 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
3160 no_printk(fmt, ##__VA_ARGS__); \
3161 __ext4_error_inode(inode, "", 0, block, err, " "); \
3163 #define ext4_error_file(file, func, line, block, fmt, ...) \
3165 no_printk(fmt, ##__VA_ARGS__); \
3166 __ext4_error_file(file, "", 0, block, " "); \
3168 #define ext4_error(sb, fmt, ...) \
3170 no_printk(fmt, ##__VA_ARGS__); \
3171 __ext4_error(sb, "", 0, false, 0, 0, " "); \
3173 #define ext4_error_err(sb, err, fmt, ...) \
3175 no_printk(fmt, ##__VA_ARGS__); \
3176 __ext4_error(sb, "", 0, false, err, 0, " "); \
3178 #define ext4_warning(sb, fmt, ...) \
3180 no_printk(fmt, ##__VA_ARGS__); \
3181 __ext4_warning(sb, "", 0, " "); \
3183 #define ext4_warning_inode(inode, fmt, ...) \
3185 no_printk(fmt, ##__VA_ARGS__); \
3186 __ext4_warning_inode(inode, "", 0, " "); \
3188 #define ext4_msg(sb, level, fmt, ...) \
3190 no_printk(fmt, ##__VA_ARGS__); \
3191 __ext4_msg(sb, "", " "); \
3193 #define dump_mmp_msg(sb, mmp, msg) \
3194 __dump_mmp_msg(sb, mmp, "", 0, "")
3195 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
3197 no_printk(fmt, ##__VA_ARGS__); \
3198 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
3203 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
3204 struct ext4_group_desc *bg);
3205 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
3206 struct ext4_group_desc *bg);
3207 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
3208 struct ext4_group_desc *bg);
3209 extern __u32 ext4_free_group_clusters(struct super_block *sb,
3210 struct ext4_group_desc *bg);
3211 extern __u32 ext4_free_inodes_count(struct super_block *sb,
3212 struct ext4_group_desc *bg);
3213 extern __u32 ext4_used_dirs_count(struct super_block *sb,
3214 struct ext4_group_desc *bg);
3215 extern __u32 ext4_itable_unused_count(struct super_block *sb,
3216 struct ext4_group_desc *bg);
3217 extern void ext4_block_bitmap_set(struct super_block *sb,
3218 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3219 extern void ext4_inode_bitmap_set(struct super_block *sb,
3220 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3221 extern void ext4_inode_table_set(struct super_block *sb,
3222 struct ext4_group_desc *bg, ext4_fsblk_t blk);
3223 extern void ext4_free_group_clusters_set(struct super_block *sb,
3224 struct ext4_group_desc *bg,
3226 extern void ext4_free_inodes_set(struct super_block *sb,
3227 struct ext4_group_desc *bg, __u32 count);
3228 extern void ext4_used_dirs_set(struct super_block *sb,
3229 struct ext4_group_desc *bg, __u32 count);
3230 extern void ext4_itable_unused_set(struct super_block *sb,
3231 struct ext4_group_desc *bg, __u32 count);
3232 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
3233 struct ext4_group_desc *gdp);
3234 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
3235 struct ext4_group_desc *gdp);
3236 extern int ext4_register_li_request(struct super_block *sb,
3237 ext4_group_t first_not_zeroed);
3239 static inline int ext4_has_metadata_csum(struct super_block *sb)
3241 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3242 !EXT4_SB(sb)->s_chksum_driver);
3244 return ext4_has_feature_metadata_csum(sb) &&
3245 (EXT4_SB(sb)->s_chksum_driver != NULL);
3248 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3250 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3253 #define ext4_read_incompat_64bit_val(es, name) \
3254 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3255 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3256 le32_to_cpu(es->name##_lo))
3258 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3260 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3263 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3265 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3268 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3270 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3273 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3276 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3277 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3280 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3283 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3284 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3287 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3290 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3291 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3294 static inline loff_t ext4_isize(struct super_block *sb,
3295 struct ext4_inode *raw_inode)
3297 if (ext4_has_feature_largedir(sb) ||
3298 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3299 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3300 le32_to_cpu(raw_inode->i_size_lo);
3302 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3305 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3307 raw_inode->i_size_lo = cpu_to_le32(i_size);
3308 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3312 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3315 struct ext4_group_info **grp_info;
3316 long indexv, indexh;
3317 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3318 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3319 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3320 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3321 return grp_info[indexh];
3325 * Reading s_groups_count requires using smp_rmb() afterwards. See
3326 * the locking protocol documented in the comments of ext4_group_add()
3329 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3331 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3337 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3338 ext4_group_t block_group)
3340 return block_group >> sbi->s_log_groups_per_flex;
3343 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3345 return 1 << sbi->s_log_groups_per_flex;
3348 #define ext4_std_error(sb, errno) \
3351 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3355 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3356 * counters. So we need to make sure we have free clusters more
3357 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3359 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3361 #define EXT4_FREECLUSTERS_WATERMARK 0
3364 /* Update i_disksize. Requires i_rwsem to avoid races with truncate */
3365 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3367 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3368 !inode_is_locked(inode));
3369 down_write(&EXT4_I(inode)->i_data_sem);
3370 if (newsize > EXT4_I(inode)->i_disksize)
3371 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3372 up_write(&EXT4_I(inode)->i_data_sem);
3375 /* Update i_size, i_disksize. Requires i_rwsem to avoid races with truncate */
3376 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3380 if (newsize > inode->i_size) {
3381 i_size_write(inode, newsize);
3384 if (newsize > EXT4_I(inode)->i_disksize) {
3385 ext4_update_i_disksize(inode, newsize);
3391 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3394 struct ext4_group_info {
3395 unsigned long bb_state;
3396 #ifdef AGGRESSIVE_CHECK
3397 unsigned long bb_check_counter;
3399 struct rb_root bb_free_root;
3400 ext4_grpblk_t bb_first_free; /* first free block */
3401 ext4_grpblk_t bb_free; /* total free blocks */
3402 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3403 int bb_avg_fragment_size_order; /* order of average
3405 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3406 ext4_group_t bb_group; /* Group number */
3407 struct list_head bb_prealloc_list;
3411 struct rw_semaphore alloc_sem;
3412 struct list_head bb_avg_fragment_size_node;
3413 struct list_head bb_largest_free_order_node;
3414 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3415 * regions, index is order.
3416 * bb_counters[3] = 5 means
3417 * 5 free 8-block regions. */
3420 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3421 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3422 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3423 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3424 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3425 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3426 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3427 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3428 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3430 #define EXT4_MB_GRP_NEED_INIT(grp) \
3431 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3432 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3433 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3434 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3435 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3437 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3438 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3439 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3440 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3441 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3442 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3443 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3444 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3446 #define EXT4_MAX_CONTENTION 8
3447 #define EXT4_CONTENTION_THRESHOLD 2
3449 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3452 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3456 * Returns true if the filesystem is busy enough that attempts to
3457 * access the block group locks has run into contention.
3459 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3461 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3464 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3466 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3467 if (spin_trylock(lock))
3469 * We're able to grab the lock right away, so drop the
3470 * lock contention counter.
3472 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3475 * The lock is busy, so bump the contention counter,
3476 * and then wait on the spin lock.
3478 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3479 EXT4_MAX_CONTENTION);
3484 static inline void ext4_unlock_group(struct super_block *sb,
3487 spin_unlock(ext4_group_lock_ptr(sb, group));
3491 static inline bool ext4_quota_capable(struct super_block *sb)
3493 return (test_opt(sb, QUOTA) || ext4_has_feature_quota(sb));
3496 static inline bool ext4_is_quota_journalled(struct super_block *sb)
3498 struct ext4_sb_info *sbi = EXT4_SB(sb);
3500 return (ext4_has_feature_quota(sb) ||
3501 sbi->s_qf_names[USRQUOTA] || sbi->s_qf_names[GRPQUOTA]);
3503 int ext4_enable_quotas(struct super_block *sb);
3507 * Block validity checking
3509 #define ext4_check_indirect_blockref(inode, bh) \
3510 ext4_check_blockref(__func__, __LINE__, inode, \
3511 (__le32 *)(bh)->b_data, \
3512 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3514 #define ext4_ind_check_inode(inode) \
3515 ext4_check_blockref(__func__, __LINE__, inode, \
3516 EXT4_I(inode)->i_data, \
3520 * Inodes and files operations
3524 extern const struct file_operations ext4_dir_operations;
3527 extern const struct inode_operations ext4_file_inode_operations;
3528 extern const struct file_operations ext4_file_operations;
3529 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3532 extern int ext4_get_max_inline_size(struct inode *inode);
3533 extern int ext4_find_inline_data_nolock(struct inode *inode);
3534 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3536 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3538 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3539 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3540 struct inode *inode,
3541 loff_t pos, unsigned len,
3542 struct page **pagep);
3543 extern int ext4_write_inline_data_end(struct inode *inode,
3544 loff_t pos, unsigned len,
3547 extern struct buffer_head *
3548 ext4_journalled_write_inline_data(struct inode *inode,
3551 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3552 struct inode *inode,
3553 loff_t pos, unsigned len,
3554 struct page **pagep,
3556 extern int ext4_try_add_inline_entry(handle_t *handle,
3557 struct ext4_filename *fname,
3558 struct inode *dir, struct inode *inode);
3559 extern int ext4_try_create_inline_dir(handle_t *handle,
3560 struct inode *parent,
3561 struct inode *inode);
3562 extern int ext4_read_inline_dir(struct file *filp,
3563 struct dir_context *ctx,
3564 int *has_inline_data);
3565 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3566 struct inode *dir, ext4_lblk_t block,
3567 struct dx_hash_info *hinfo,
3568 __u32 start_hash, __u32 start_minor_hash,
3569 int *has_inline_data);
3570 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3571 struct ext4_filename *fname,
3572 struct ext4_dir_entry_2 **res_dir,
3573 int *has_inline_data);
3574 extern int ext4_delete_inline_entry(handle_t *handle,
3576 struct ext4_dir_entry_2 *de_del,
3577 struct buffer_head *bh,
3578 int *has_inline_data);
3579 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3580 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3581 struct ext4_dir_entry_2 **parent_de,
3583 extern int ext4_inline_data_fiemap(struct inode *inode,
3584 struct fiemap_extent_info *fieinfo,
3585 int *has_inline, __u64 start, __u64 len);
3586 extern void *ext4_read_inline_link(struct inode *inode);
3589 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3591 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3593 extern int ext4_convert_inline_data(struct inode *inode);
3595 static inline int ext4_has_inline_data(struct inode *inode)
3597 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3598 EXT4_I(inode)->i_inline_off;
3602 extern const struct inode_operations ext4_dir_inode_operations;
3603 extern const struct inode_operations ext4_special_inode_operations;
3604 extern struct dentry *ext4_get_parent(struct dentry *child);
3605 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3606 struct ext4_dir_entry_2 *de,
3607 int blocksize, int csum_size,
3608 unsigned int parent_ino, int dotdot_real_len);
3609 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3610 unsigned int blocksize);
3611 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3612 struct buffer_head *bh);
3613 extern int __ext4_unlink(handle_t *handle, struct inode *dir, const struct qstr *d_name,
3614 struct inode *inode);
3615 extern int __ext4_link(struct inode *dir, struct inode *inode,
3616 struct dentry *dentry);
3619 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3620 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3621 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3622 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3623 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3624 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3625 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3626 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3629 static inline void ext4_set_de_type(struct super_block *sb,
3630 struct ext4_dir_entry_2 *de,
3632 if (ext4_has_feature_filetype(sb))
3633 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3637 extern int ext4_mpage_readpages(struct inode *inode,
3638 struct readahead_control *rac, struct page *page);
3639 extern int __init ext4_init_post_read_processing(void);
3640 extern void ext4_exit_post_read_processing(void);
3643 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3644 extern const struct inode_operations ext4_symlink_inode_operations;
3645 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3648 extern void ext4_notify_error_sysfs(struct ext4_sb_info *sbi);
3649 extern int ext4_register_sysfs(struct super_block *sb);
3650 extern void ext4_unregister_sysfs(struct super_block *sb);
3651 extern int __init ext4_init_sysfs(void);
3652 extern void ext4_exit_sysfs(void);
3654 /* block_validity */
3655 extern void ext4_release_system_zone(struct super_block *sb);
3656 extern int ext4_setup_system_zone(struct super_block *sb);
3657 extern int __init ext4_init_system_zone(void);
3658 extern void ext4_exit_system_zone(void);
3659 extern int ext4_inode_block_valid(struct inode *inode,
3660 ext4_fsblk_t start_blk,
3661 unsigned int count);
3662 extern int ext4_check_blockref(const char *, unsigned int,
3663 struct inode *, __le32 *, unsigned int);
3664 extern int ext4_sb_block_valid(struct super_block *sb, struct inode *inode,
3665 ext4_fsblk_t start_blk, unsigned int count);
3669 struct ext4_ext_path;
3673 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3676 #define EXT_MAX_BLOCKS 0xffffffff
3678 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3679 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3680 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3681 struct ext4_map_blocks *map, int flags);
3682 extern int ext4_ext_truncate(handle_t *, struct inode *);
3683 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3685 extern void ext4_ext_init(struct super_block *);
3686 extern void ext4_ext_release(struct super_block *);
3687 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3689 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3690 loff_t offset, ssize_t len);
3691 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3692 ext4_io_end_t *io_end);
3693 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3694 struct ext4_map_blocks *map, int flags);
3695 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3697 struct ext4_ext_path *path);
3698 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3699 struct ext4_ext_path **,
3700 struct ext4_extent *, int);
3701 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3702 struct ext4_ext_path **,
3704 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3705 extern int ext4_ext_check_inode(struct inode *inode);
3706 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3707 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3708 __u64 start, __u64 len);
3709 extern int ext4_get_es_cache(struct inode *inode,
3710 struct fiemap_extent_info *fieinfo,
3711 __u64 start, __u64 len);
3712 extern int ext4_ext_precache(struct inode *inode);
3713 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3714 struct inode *inode2, ext4_lblk_t lblk1,
3715 ext4_lblk_t lblk2, ext4_lblk_t count,
3716 int mark_unwritten,int *err);
3717 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3718 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3719 int check_cred, int restart_cred,
3721 extern void ext4_ext_replay_shrink_inode(struct inode *inode, ext4_lblk_t end);
3722 extern int ext4_ext_replay_set_iblocks(struct inode *inode);
3723 extern int ext4_ext_replay_update_ex(struct inode *inode, ext4_lblk_t start,
3724 int len, int unwritten, ext4_fsblk_t pblk);
3725 extern int ext4_ext_clear_bb(struct inode *inode);
3729 extern void ext4_double_down_write_data_sem(struct inode *first,
3730 struct inode *second);
3731 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3732 struct inode *donor_inode);
3733 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3734 __u64 start_orig, __u64 start_donor,
3735 __u64 len, __u64 *moved_len);
3738 extern int __init ext4_init_pageio(void);
3739 extern void ext4_exit_pageio(void);
3740 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3741 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3742 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3743 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3744 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3745 struct writeback_control *wbc);
3746 extern void ext4_end_io_rsv_work(struct work_struct *work);
3747 extern void ext4_io_submit(struct ext4_io_submit *io);
3748 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3752 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3753 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3756 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3759 extern void ext4_stop_mmpd(struct ext4_sb_info *sbi);
3762 extern const struct fsverity_operations ext4_verityops;
3765 extern int ext4_orphan_add(handle_t *, struct inode *);
3766 extern int ext4_orphan_del(handle_t *, struct inode *);
3767 extern void ext4_orphan_cleanup(struct super_block *sb,
3768 struct ext4_super_block *es);
3769 extern void ext4_release_orphan_info(struct super_block *sb);
3770 extern int ext4_init_orphan_info(struct super_block *sb);
3771 extern int ext4_orphan_file_empty(struct super_block *sb);
3772 extern void ext4_orphan_file_block_trigger(
3773 struct jbd2_buffer_trigger_type *triggers,
3774 struct buffer_head *bh,
3775 void *data, size_t size);
3778 * Add new method to test whether block and inode bitmaps are properly
3779 * initialized. With uninit_bg reading the block from disk is not enough
3780 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3782 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3784 static inline int bitmap_uptodate(struct buffer_head *bh)
3786 return (buffer_uptodate(bh) &&
3787 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3789 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3791 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3794 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3796 /* For ioend & aio unwritten conversion wait queues */
3797 #define EXT4_WQ_HASH_SZ 37
3798 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3800 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3802 extern int ext4_resize_begin(struct super_block *sb);
3803 extern void ext4_resize_end(struct super_block *sb);
3805 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3806 struct ext4_io_end *io_end)
3808 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3809 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3810 atomic_inc(&EXT4_I(inode)->i_unwritten);
3814 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3816 struct inode *inode = io_end->inode;
3818 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3819 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3820 /* Wake up anyone waiting on unwritten extent conversion */
3821 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3822 wake_up_all(ext4_ioend_wq(inode));
3826 extern const struct iomap_ops ext4_iomap_ops;
3827 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3828 extern const struct iomap_ops ext4_iomap_report_ops;
3830 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3833 * If the buffer has the write error flag, we have failed
3834 * to write out data in the block. In this case, we don't
3835 * have to read the block because we may read the old data
3838 if (buffer_write_io_error(bh))
3839 set_buffer_uptodate(bh);
3840 return buffer_uptodate(bh);
3843 #endif /* __KERNEL__ */
3845 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3846 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3848 #endif /* _EXT4_H */