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/types.h>
21 #include <linux/blkdev.h>
22 #include <linux/magic.h>
23 #include <linux/jbd2.h>
24 #include <linux/quota.h>
25 #include <linux/rwsem.h>
26 #include <linux/rbtree.h>
27 #include <linux/seqlock.h>
28 #include <linux/mutex.h>
29 #include <linux/timer.h>
30 #include <linux/wait.h>
31 #include <linux/sched/signal.h>
32 #include <linux/blockgroup_lock.h>
33 #include <linux/percpu_counter.h>
34 #include <linux/ratelimit.h>
35 #include <crypto/hash.h>
36 #include <linux/falloc.h>
37 #include <linux/percpu-rwsem.h>
38 #include <linux/fiemap.h>
40 #include <linux/compat.h>
43 #include <linux/fscrypt.h>
44 #include <linux/fsverity.h>
46 #include <linux/compiler.h>
49 * The fourth extended filesystem constants/structures
53 * with AGGRESSIVE_CHECK allocator runs consistency checks over
54 * structures. these checks slow things down a lot
56 #define AGGRESSIVE_CHECK__
59 * with DOUBLE_CHECK defined mballoc creates persistent in-core
60 * bitmaps, maintains and uses them to check for double allocations
62 #define DOUBLE_CHECK__
65 * Define EXT4FS_DEBUG to produce debug messages
73 #define ext4_debug(f, a...) \
75 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
76 __FILE__, __LINE__, __func__); \
77 printk(KERN_DEBUG f, ## a); \
80 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
84 * Turn on EXT_DEBUG to enable ext4_ext_show_path/leaf/move in extents.c
89 * Dynamic printk for controlled extents debugging.
91 #ifdef CONFIG_EXT4_DEBUG
92 #define ext_debug(ino, fmt, ...) \
93 pr_debug("[%s/%d] EXT4-fs (%s): ino %lu: (%s, %d): %s:" fmt, \
94 current->comm, task_pid_nr(current), \
95 ino->i_sb->s_id, ino->i_ino, __FILE__, __LINE__, \
96 __func__, ##__VA_ARGS__)
98 #define ext_debug(ino, fmt, ...) no_printk(fmt, ##__VA_ARGS__)
101 /* data type for block offset of block group */
102 typedef int ext4_grpblk_t;
104 /* data type for filesystem-wide blocks number */
105 typedef unsigned long long ext4_fsblk_t;
107 /* data type for file logical block number */
108 typedef __u32 ext4_lblk_t;
110 /* data type for block group number */
111 typedef unsigned int ext4_group_t;
113 enum SHIFT_DIRECTION {
119 * Flags used in mballoc's allocation_context flags field.
121 * Also used to show what's going on for debugging purposes when the
122 * flag field is exported via the traceport interface
125 /* prefer goal again. length */
126 #define EXT4_MB_HINT_MERGE 0x0001
127 /* blocks already reserved */
128 #define EXT4_MB_HINT_RESERVED 0x0002
129 /* metadata is being allocated */
130 #define EXT4_MB_HINT_METADATA 0x0004
131 /* first blocks in the file */
132 #define EXT4_MB_HINT_FIRST 0x0008
133 /* search for the best chunk */
134 #define EXT4_MB_HINT_BEST 0x0010
135 /* data is being allocated */
136 #define EXT4_MB_HINT_DATA 0x0020
137 /* don't preallocate (for tails) */
138 #define EXT4_MB_HINT_NOPREALLOC 0x0040
139 /* allocate for locality group */
140 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
141 /* allocate goal blocks or none */
142 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
143 /* goal is meaningful */
144 #define EXT4_MB_HINT_TRY_GOAL 0x0200
145 /* blocks already pre-reserved by delayed allocation */
146 #define EXT4_MB_DELALLOC_RESERVED 0x0400
147 /* We are doing stream allocation */
148 #define EXT4_MB_STREAM_ALLOC 0x0800
149 /* Use reserved root blocks if needed */
150 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
151 /* Use blocks from reserved pool */
152 #define EXT4_MB_USE_RESERVED 0x2000
153 /* Do strict check for free blocks while retrying block allocation */
154 #define EXT4_MB_STRICT_CHECK 0x4000
156 struct ext4_allocation_request {
157 /* target inode for block we're allocating */
159 /* how many blocks we want to allocate */
161 /* logical block in target inode */
163 /* the closest logical allocated block to the left */
165 /* the closest logical allocated block to the right */
167 /* phys. target (a hint) */
169 /* phys. block for the closest logical allocated block to the left */
171 /* phys. block for the closest logical allocated block to the right */
173 /* flags. see above EXT4_MB_HINT_* */
178 * Logical to physical block mapping, used by ext4_map_blocks()
180 * This structure is used to pass requests into ext4_map_blocks() as
181 * well as to store the information returned by ext4_map_blocks(). It
182 * takes less room on the stack than a struct buffer_head.
184 #define EXT4_MAP_NEW BIT(BH_New)
185 #define EXT4_MAP_MAPPED BIT(BH_Mapped)
186 #define EXT4_MAP_UNWRITTEN BIT(BH_Unwritten)
187 #define EXT4_MAP_BOUNDARY BIT(BH_Boundary)
188 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
189 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
191 struct ext4_map_blocks {
195 unsigned int m_flags;
199 * Block validity checking, system zone rbtree.
201 struct ext4_system_blocks {
207 * Flags for ext4_io_end->flags
209 #define EXT4_IO_END_UNWRITTEN 0x0001
211 struct ext4_io_end_vec {
212 struct list_head list; /* list of io_end_vec */
213 loff_t offset; /* offset in the file */
214 ssize_t size; /* size of the extent */
218 * For converting unwritten extents on a work queue. 'handle' is used for
219 * buffered writeback.
221 typedef struct ext4_io_end {
222 struct list_head list; /* per-file finished IO list */
223 handle_t *handle; /* handle reserved for extent
225 struct inode *inode; /* file being written to */
226 struct bio *bio; /* Linked list of completed
227 * bios covering the extent */
228 unsigned int flag; /* unwritten or not */
229 atomic_t count; /* reference counter */
230 struct list_head list_vec; /* list of ext4_io_end_vec */
233 struct ext4_io_submit {
234 struct writeback_control *io_wbc;
236 ext4_io_end_t *io_end;
237 sector_t io_next_block;
241 * Special inodes numbers
243 #define EXT4_BAD_INO 1 /* Bad blocks inode */
244 #define EXT4_ROOT_INO 2 /* Root inode */
245 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
246 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
247 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
248 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
249 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
250 #define EXT4_JOURNAL_INO 8 /* Journal inode */
252 /* First non-reserved inode for old ext4 filesystems */
253 #define EXT4_GOOD_OLD_FIRST_INO 11
256 * Maximal count of links to a file
258 #define EXT4_LINK_MAX 65000
261 * Macro-instructions used to manage several block sizes
263 #define EXT4_MIN_BLOCK_SIZE 1024
264 #define EXT4_MAX_BLOCK_SIZE 65536
265 #define EXT4_MIN_BLOCK_LOG_SIZE 10
266 #define EXT4_MAX_BLOCK_LOG_SIZE 16
267 #define EXT4_MAX_CLUSTER_LOG_SIZE 30
269 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
271 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
273 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
274 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
275 EXT4_SB(s)->s_cluster_bits)
277 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
278 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
280 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
283 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
284 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
285 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
287 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
288 EXT4_GOOD_OLD_INODE_SIZE : \
290 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
291 EXT4_GOOD_OLD_FIRST_INO : \
294 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
295 #define EXT4_MAX_BLOCKS(size, offset, blkbits) \
296 ((EXT4_BLOCK_ALIGN(size + offset, blkbits) >> blkbits) - (offset >> \
299 /* Translate a block number to a cluster number */
300 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
301 /* Translate a cluster number to a block number */
302 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
303 /* Translate # of blks to # of clusters */
304 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
305 (sbi)->s_cluster_bits)
306 /* Mask out the low bits to get the starting block of the cluster */
307 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
308 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
309 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
310 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
311 /* Fill in the low bits to get the last block of the cluster */
312 #define EXT4_LBLK_CFILL(sbi, lblk) ((lblk) | \
313 ((ext4_lblk_t) (sbi)->s_cluster_ratio - 1))
314 /* Get the cluster offset */
315 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
316 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
317 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
318 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
321 * Structure of a blocks group descriptor
323 struct ext4_group_desc
325 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
326 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
327 __le32 bg_inode_table_lo; /* Inodes table block */
328 __le16 bg_free_blocks_count_lo;/* Free blocks count */
329 __le16 bg_free_inodes_count_lo;/* Free inodes count */
330 __le16 bg_used_dirs_count_lo; /* Directories count */
331 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
332 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
333 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
334 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
335 __le16 bg_itable_unused_lo; /* Unused inodes count */
336 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
337 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
338 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
339 __le32 bg_inode_table_hi; /* Inodes table block MSB */
340 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
341 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
342 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
343 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
344 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
345 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
346 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
350 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
351 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
353 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
354 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
358 * Structure of a flex block group info
362 atomic64_t free_clusters;
363 atomic_t free_inodes;
367 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
368 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
369 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
372 * Macro-instructions used to manage group descriptors
374 #define EXT4_MIN_DESC_SIZE 32
375 #define EXT4_MIN_DESC_SIZE_64BIT 64
376 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
377 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
379 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
380 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
381 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
382 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
383 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
385 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
386 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
387 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
391 * Constants relative to the data blocks
393 #define EXT4_NDIR_BLOCKS 12
394 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
395 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
396 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
397 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
402 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
403 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
404 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
405 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
406 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
407 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
408 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
409 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
410 /* Reserved for compression usage... */
411 #define EXT4_DIRTY_FL 0x00000100
412 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
413 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
414 /* nb: was previously EXT2_ECOMPR_FL */
415 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
416 /* End compression flags --- maybe not all used */
417 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
418 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
419 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
420 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
421 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
422 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
423 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
424 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
425 #define EXT4_VERITY_FL 0x00100000 /* Verity protected inode */
426 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
427 /* 0x00400000 was formerly EXT4_EOFBLOCKS_FL */
429 #define EXT4_DAX_FL 0x02000000 /* Inode is DAX */
431 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
432 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
433 #define EXT4_CASEFOLD_FL 0x40000000 /* Casefolded directory */
434 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
436 /* User modifiable flags */
437 #define EXT4_FL_USER_MODIFIABLE (EXT4_SECRM_FL | \
441 EXT4_IMMUTABLE_FL | \
445 EXT4_JOURNAL_DATA_FL | \
450 0x00400000 /* EXT4_EOFBLOCKS_FL */ | \
452 EXT4_PROJINHERIT_FL | \
455 /* User visible flags */
456 #define EXT4_FL_USER_VISIBLE (EXT4_FL_USER_MODIFIABLE | \
465 /* Flags we can manipulate with through FS_IOC_FSSETXATTR */
466 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
467 EXT4_IMMUTABLE_FL | \
471 EXT4_PROJINHERIT_FL | \
474 /* Flags that should be inherited by new inodes from their parent. */
475 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
476 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
477 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
478 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
479 EXT4_PROJINHERIT_FL | EXT4_CASEFOLD_FL |\
482 /* Flags that are appropriate for regular files (all but dir-specific ones). */
483 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL | EXT4_CASEFOLD_FL |\
484 EXT4_PROJINHERIT_FL))
486 /* Flags that are appropriate for non-directories/regular files. */
487 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
489 /* The only flags that should be swapped */
490 #define EXT4_FL_SHOULD_SWAP (EXT4_HUGE_FILE_FL | EXT4_EXTENTS_FL)
492 /* Flags which are mutually exclusive to DAX */
493 #define EXT4_DAX_MUT_EXCL (EXT4_VERITY_FL | EXT4_ENCRYPT_FL |\
494 EXT4_JOURNAL_DATA_FL | EXT4_INLINE_DATA_FL)
496 /* Mask out flags that are inappropriate for the given type of inode. */
497 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
501 else if (S_ISREG(mode))
502 return flags & EXT4_REG_FLMASK;
504 return flags & EXT4_OTHER_FLMASK;
508 * Inode flags used for atomic set/get
511 EXT4_INODE_SECRM = 0, /* Secure deletion */
512 EXT4_INODE_UNRM = 1, /* Undelete */
513 EXT4_INODE_COMPR = 2, /* Compress file */
514 EXT4_INODE_SYNC = 3, /* Synchronous updates */
515 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
516 EXT4_INODE_APPEND = 5, /* writes to file may only append */
517 EXT4_INODE_NODUMP = 6, /* do not dump file */
518 EXT4_INODE_NOATIME = 7, /* do not update atime */
519 /* Reserved for compression usage... */
520 EXT4_INODE_DIRTY = 8,
521 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
522 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
523 EXT4_INODE_ENCRYPT = 11, /* Encrypted file */
524 /* End compression flags --- maybe not all used */
525 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
526 EXT4_INODE_IMAGIC = 13, /* AFS directory */
527 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
528 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
529 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
530 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
531 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
532 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
533 EXT4_INODE_VERITY = 20, /* Verity protected inode */
534 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
535 /* 22 was formerly EXT4_INODE_EOFBLOCKS */
536 EXT4_INODE_DAX = 25, /* Inode is DAX */
537 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
538 EXT4_INODE_PROJINHERIT = 29, /* Create with parents projid */
539 EXT4_INODE_CASEFOLD = 30, /* Casefolded directory */
540 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
544 * Since it's pretty easy to mix up bit numbers and hex values, we use a
545 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
546 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
547 * any extra space in the compiled kernel image, otherwise, the build will fail.
548 * It's important that these values are the same, since we are using
549 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
550 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
551 * values found in ext2, ext3 and ext4 filesystems, and of course the values
552 * defined in e2fsprogs.
554 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
556 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
557 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
559 static inline void ext4_check_flag_values(void)
561 CHECK_FLAG_VALUE(SECRM);
562 CHECK_FLAG_VALUE(UNRM);
563 CHECK_FLAG_VALUE(COMPR);
564 CHECK_FLAG_VALUE(SYNC);
565 CHECK_FLAG_VALUE(IMMUTABLE);
566 CHECK_FLAG_VALUE(APPEND);
567 CHECK_FLAG_VALUE(NODUMP);
568 CHECK_FLAG_VALUE(NOATIME);
569 CHECK_FLAG_VALUE(DIRTY);
570 CHECK_FLAG_VALUE(COMPRBLK);
571 CHECK_FLAG_VALUE(NOCOMPR);
572 CHECK_FLAG_VALUE(ENCRYPT);
573 CHECK_FLAG_VALUE(INDEX);
574 CHECK_FLAG_VALUE(IMAGIC);
575 CHECK_FLAG_VALUE(JOURNAL_DATA);
576 CHECK_FLAG_VALUE(NOTAIL);
577 CHECK_FLAG_VALUE(DIRSYNC);
578 CHECK_FLAG_VALUE(TOPDIR);
579 CHECK_FLAG_VALUE(HUGE_FILE);
580 CHECK_FLAG_VALUE(EXTENTS);
581 CHECK_FLAG_VALUE(VERITY);
582 CHECK_FLAG_VALUE(EA_INODE);
583 CHECK_FLAG_VALUE(INLINE_DATA);
584 CHECK_FLAG_VALUE(PROJINHERIT);
585 CHECK_FLAG_VALUE(CASEFOLD);
586 CHECK_FLAG_VALUE(RESERVED);
589 /* Used to pass group descriptor data when online resize is done */
590 struct ext4_new_group_input {
591 __u32 group; /* Group number for this data */
592 __u64 block_bitmap; /* Absolute block number of block bitmap */
593 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
594 __u64 inode_table; /* Absolute block number of inode table start */
595 __u32 blocks_count; /* Total number of blocks in this group */
596 __u16 reserved_blocks; /* Number of reserved blocks in this group */
600 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
601 struct compat_ext4_new_group_input {
603 compat_u64 block_bitmap;
604 compat_u64 inode_bitmap;
605 compat_u64 inode_table;
612 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
613 struct ext4_new_group_data {
619 __u16 reserved_blocks;
621 __u32 free_clusters_count;
624 /* Indexes used to index group tables in ext4_new_group_data */
626 BLOCK_BITMAP = 0, /* block bitmap */
627 INODE_BITMAP, /* inode bitmap */
628 INODE_TABLE, /* inode tables */
633 * Flags used by ext4_map_blocks()
635 /* Allocate any needed blocks and/or convert an unwritten
636 extent to be an initialized ext4 */
637 #define EXT4_GET_BLOCKS_CREATE 0x0001
638 /* Request the creation of an unwritten extent */
639 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
640 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
641 EXT4_GET_BLOCKS_CREATE)
642 /* Caller is from the delayed allocation writeout path
643 * finally doing the actual allocation of delayed blocks */
644 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
645 /* caller is from the direct IO path, request to creation of an
646 unwritten extents if not allocated, split the unwritten
647 extent if blocks has been preallocated already*/
648 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
649 #define EXT4_GET_BLOCKS_CONVERT 0x0010
650 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
651 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
652 /* Convert extent to initialized after IO complete */
653 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
654 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
655 /* Eventual metadata allocation (due to growing extent tree)
656 * should not fail, so try to use reserved blocks for that.*/
657 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
658 /* Don't normalize allocation size (used for fallocate) */
659 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
660 /* Convert written extents to unwritten */
661 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
662 /* Write zeros to newly created written extents */
663 #define EXT4_GET_BLOCKS_ZERO 0x0200
664 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
665 EXT4_GET_BLOCKS_ZERO)
666 /* Caller will submit data before dropping transaction handle. This
667 * allows jbd2 to avoid submitting data before commit. */
668 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
671 * The bit position of these flags must not overlap with any of the
672 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
673 * read_extent_tree_block(), ext4_split_extent_at(),
674 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
675 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
676 * caching the extents when reading from the extent tree while a
677 * truncate or punch hole operation is in progress.
679 #define EXT4_EX_NOCACHE 0x40000000
680 #define EXT4_EX_FORCE_CACHE 0x20000000
681 #define EXT4_EX_NOFAIL 0x10000000
684 * Flags used by ext4_free_blocks
686 #define EXT4_FREE_BLOCKS_METADATA 0x0001
687 #define EXT4_FREE_BLOCKS_FORGET 0x0002
688 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
689 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
690 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
691 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
692 #define EXT4_FREE_BLOCKS_RERESERVE_CLUSTER 0x0040
697 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
698 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
699 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
700 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
701 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
702 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
703 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
704 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
705 #define EXT4_IOC_MIGRATE _IO('f', 9)
706 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
707 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
708 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
709 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
710 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
711 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
712 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
713 /* ioctl codes 19--39 are reserved for fscrypt */
714 #define EXT4_IOC_CLEAR_ES_CACHE _IO('f', 40)
715 #define EXT4_IOC_GETSTATE _IOW('f', 41, __u32)
716 #define EXT4_IOC_GET_ES_CACHE _IOWR('f', 42, struct fiemap)
718 #define EXT4_IOC_SHUTDOWN _IOR ('X', 125, __u32)
721 * Flags for going down operation
723 #define EXT4_GOING_FLAGS_DEFAULT 0x0 /* going down */
724 #define EXT4_GOING_FLAGS_LOGFLUSH 0x1 /* flush log but not data */
725 #define EXT4_GOING_FLAGS_NOLOGFLUSH 0x2 /* don't flush log nor data */
728 * Flags returned by EXT4_IOC_GETSTATE
730 * We only expose to userspace a subset of the state flags in
733 #define EXT4_STATE_FLAG_EXT_PRECACHED 0x00000001
734 #define EXT4_STATE_FLAG_NEW 0x00000002
735 #define EXT4_STATE_FLAG_NEWENTRY 0x00000004
736 #define EXT4_STATE_FLAG_DA_ALLOC_CLOSE 0x00000008
738 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
740 * ioctl commands in 32 bit emulation
742 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
743 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
744 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
745 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
746 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
747 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
748 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
749 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
753 * Returned by EXT4_IOC_GET_ES_CACHE as an additional possible flag.
754 * It indicates that the entry in extent status cache is for a hole.
756 #define EXT4_FIEMAP_EXTENT_HOLE 0x08000000
758 /* Max physical block we can address w/o extents */
759 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
761 /* Max logical block we can support */
762 #define EXT4_MAX_LOGICAL_BLOCK 0xFFFFFFFE
765 * Structure of an inode on the disk
768 __le16 i_mode; /* File mode */
769 __le16 i_uid; /* Low 16 bits of Owner Uid */
770 __le32 i_size_lo; /* Size in bytes */
771 __le32 i_atime; /* Access time */
772 __le32 i_ctime; /* Inode Change time */
773 __le32 i_mtime; /* Modification time */
774 __le32 i_dtime; /* Deletion Time */
775 __le16 i_gid; /* Low 16 bits of Group Id */
776 __le16 i_links_count; /* Links count */
777 __le32 i_blocks_lo; /* Blocks count */
778 __le32 i_flags; /* File flags */
784 __u32 h_i_translator;
789 } osd1; /* OS dependent 1 */
790 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
791 __le32 i_generation; /* File version (for NFS) */
792 __le32 i_file_acl_lo; /* File ACL */
794 __le32 i_obso_faddr; /* Obsoleted fragment address */
797 __le16 l_i_blocks_high; /* were l_i_reserved1 */
798 __le16 l_i_file_acl_high;
799 __le16 l_i_uid_high; /* these 2 fields */
800 __le16 l_i_gid_high; /* were reserved2[0] */
801 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
805 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
812 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
813 __le16 m_i_file_acl_high;
814 __u32 m_i_reserved2[2];
816 } osd2; /* OS dependent 2 */
817 __le16 i_extra_isize;
818 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
819 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
820 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
821 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
822 __le32 i_crtime; /* File Creation time */
823 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
824 __le32 i_version_hi; /* high 32 bits for 64-bit version */
825 __le32 i_projid; /* Project ID */
829 __u32 reserved; /* should be zero */
830 __u32 donor_fd; /* donor file descriptor */
831 __u64 orig_start; /* logical start offset in block for orig */
832 __u64 donor_start; /* logical start offset in block for donor */
833 __u64 len; /* block length to be moved */
834 __u64 moved_len; /* moved block length */
837 #define EXT4_EPOCH_BITS 2
838 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
839 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
842 * Extended fields will fit into an inode if the filesystem was formatted
843 * with large inodes (-I 256 or larger) and there are not currently any EAs
844 * consuming all of the available space. For new inodes we always reserve
845 * enough space for the kernel's known extended fields, but for inodes
846 * created with an old kernel this might not have been the case. None of
847 * the extended inode fields is critical for correct filesystem operation.
848 * This macro checks if a certain field fits in the inode. Note that
849 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
851 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
852 ((offsetof(typeof(*ext4_inode), field) + \
853 sizeof((ext4_inode)->field)) \
854 <= (EXT4_GOOD_OLD_INODE_SIZE + \
855 (einode)->i_extra_isize)) \
858 * We use an encoding that preserves the times for extra epoch "00":
860 * extra msb of adjust for signed
861 * epoch 32-bit 32-bit tv_sec to
862 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
863 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
864 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
865 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
866 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
867 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
868 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
869 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
870 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
872 * Note that previous versions of the kernel on 64-bit systems would
873 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
874 * 1970. e2fsck will correct this, assuming that it is run on the
875 * affected filesystem before 2242.
878 static inline __le32 ext4_encode_extra_time(struct timespec64 *time)
880 u32 extra =((time->tv_sec - (s32)time->tv_sec) >> 32) & EXT4_EPOCH_MASK;
881 return cpu_to_le32(extra | (time->tv_nsec << EXT4_EPOCH_BITS));
884 static inline void ext4_decode_extra_time(struct timespec64 *time,
887 if (unlikely(extra & cpu_to_le32(EXT4_EPOCH_MASK)))
888 time->tv_sec += (u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK) << 32;
889 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
892 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
894 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) {\
895 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
896 (raw_inode)->xtime ## _extra = \
897 ext4_encode_extra_time(&(inode)->xtime); \
900 (raw_inode)->xtime = cpu_to_le32(clamp_t(int32_t, (inode)->xtime.tv_sec, S32_MIN, S32_MAX)); \
903 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
905 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
906 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
907 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
908 (raw_inode)->xtime ## _extra = \
909 ext4_encode_extra_time(&(einode)->xtime); \
912 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
914 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
915 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) { \
916 ext4_decode_extra_time(&(inode)->xtime, \
917 raw_inode->xtime ## _extra); \
920 (inode)->xtime.tv_nsec = 0; \
924 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
926 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
927 (einode)->xtime.tv_sec = \
928 (signed)le32_to_cpu((raw_inode)->xtime); \
930 (einode)->xtime.tv_sec = 0; \
931 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
932 ext4_decode_extra_time(&(einode)->xtime, \
933 raw_inode->xtime ## _extra); \
935 (einode)->xtime.tv_nsec = 0; \
938 #define i_disk_version osd1.linux1.l_i_version
940 #if defined(__KERNEL__) || defined(__linux__)
941 #define i_reserved1 osd1.linux1.l_i_reserved1
942 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
943 #define i_blocks_high osd2.linux2.l_i_blocks_high
944 #define i_uid_low i_uid
945 #define i_gid_low i_gid
946 #define i_uid_high osd2.linux2.l_i_uid_high
947 #define i_gid_high osd2.linux2.l_i_gid_high
948 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
950 #elif defined(__GNU__)
952 #define i_translator osd1.hurd1.h_i_translator
953 #define i_uid_high osd2.hurd2.h_i_uid_high
954 #define i_gid_high osd2.hurd2.h_i_gid_high
955 #define i_author osd2.hurd2.h_i_author
957 #elif defined(__masix__)
959 #define i_reserved1 osd1.masix1.m_i_reserved1
960 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
961 #define i_reserved2 osd2.masix2.m_i_reserved2
963 #endif /* defined(__KERNEL__) || defined(__linux__) */
965 #include "extents_status.h"
968 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
970 * These are needed to avoid lockdep false positives when we need to
971 * allocate blocks to the quota inode during ext4_map_blocks(), while
972 * holding i_data_sem for a normal (non-quota) inode. Since we don't
973 * do quota tracking for the quota inode, this avoids deadlock (as
974 * well as infinite recursion, since it isn't turtles all the way
977 * I_DATA_SEM_NORMAL - Used for most inodes
978 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
979 * where the second inode has larger inode number
981 * I_DATA_SEM_QUOTA - Used for quota inodes only
984 I_DATA_SEM_NORMAL = 0,
991 * fourth extended file system inode data in memory
993 struct ext4_inode_info {
994 __le32 i_data[15]; /* unconverted */
996 ext4_fsblk_t i_file_acl;
999 * i_block_group is the number of the block group which contains
1000 * this file's inode. Constant across the lifetime of the inode,
1001 * it is used for making block allocation decisions - we try to
1002 * place a file's data blocks near its inode block, and new inodes
1003 * near to their parent directory's inode.
1005 ext4_group_t i_block_group;
1006 ext4_lblk_t i_dir_start_lookup;
1007 #if (BITS_PER_LONG < 64)
1008 unsigned long i_state_flags; /* Dynamic state flags */
1010 unsigned long i_flags;
1013 * Extended attributes can be read independently of the main file
1014 * data. Taking i_mutex even when reading would cause contention
1015 * between readers of EAs and writers of regular file data, so
1016 * instead we synchronize on xattr_sem when reading or changing
1019 struct rw_semaphore xattr_sem;
1021 struct list_head i_orphan; /* unlinked but open inodes */
1024 * i_disksize keeps track of what the inode size is ON DISK, not
1025 * in memory. During truncate, i_size is set to the new size by
1026 * the VFS prior to calling ext4_truncate(), but the filesystem won't
1027 * set i_disksize to 0 until the truncate is actually under way.
1029 * The intent is that i_disksize always represents the blocks which
1030 * are used by this file. This allows recovery to restart truncate
1031 * on orphans if we crash during truncate. We actually write i_disksize
1032 * into the on-disk inode when writing inodes out, instead of i_size.
1034 * The only time when i_disksize and i_size may be different is when
1035 * a truncate is in progress. The only things which change i_disksize
1036 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
1041 * i_data_sem is for serialising ext4_truncate() against
1042 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
1043 * data tree are chopped off during truncate. We can't do that in
1044 * ext4 because whenever we perform intermediate commits during
1045 * truncate, the inode and all the metadata blocks *must* be in a
1046 * consistent state which allows truncation of the orphans to restart
1047 * during recovery. Hence we must fix the get_block-vs-truncate race
1048 * by other means, so we have i_data_sem.
1050 struct rw_semaphore i_data_sem;
1052 * i_mmap_sem is for serializing page faults with truncate / punch hole
1053 * operations. We have to make sure that new page cannot be faulted in
1054 * a section of the inode that is being punched. We cannot easily use
1055 * i_data_sem for this since we need protection for the whole punch
1056 * operation and i_data_sem ranks below transaction start so we have
1057 * to occasionally drop it.
1059 struct rw_semaphore i_mmap_sem;
1060 struct inode vfs_inode;
1061 struct jbd2_inode *jinode;
1063 spinlock_t i_raw_lock; /* protects updates to the raw inode */
1066 * File creation time. Its function is same as that of
1067 * struct timespec64 i_{a,c,m}time in the generic inode.
1069 struct timespec64 i_crtime;
1072 atomic_t i_prealloc_active;
1073 struct list_head i_prealloc_list;
1074 spinlock_t i_prealloc_lock;
1076 /* extents status tree */
1077 struct ext4_es_tree i_es_tree;
1079 struct list_head i_es_list;
1080 unsigned int i_es_all_nr; /* protected by i_es_lock */
1081 unsigned int i_es_shk_nr; /* protected by i_es_lock */
1082 ext4_lblk_t i_es_shrink_lblk; /* Offset where we start searching for
1083 extents to shrink. Protected by
1087 ext4_group_t i_last_alloc_group;
1089 /* allocation reservation info for delalloc */
1090 /* In case of bigalloc, this refer to clusters rather than blocks */
1091 unsigned int i_reserved_data_blocks;
1093 /* pending cluster reservations for bigalloc file systems */
1094 struct ext4_pending_tree i_pending_tree;
1096 /* on-disk additional length */
1097 __u16 i_extra_isize;
1099 /* Indicate the inline data space. */
1104 /* quota space reservation, managed internally by quota code */
1105 qsize_t i_reserved_quota;
1108 /* Lock protecting lists below */
1109 spinlock_t i_completed_io_lock;
1111 * Completed IOs that need unwritten extents handling and have
1112 * transaction reserved
1114 struct list_head i_rsv_conversion_list;
1115 struct work_struct i_rsv_conversion_work;
1116 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
1118 spinlock_t i_block_reservation_lock;
1121 * Transactions that contain inode's metadata needed to complete
1122 * fsync and fdatasync, respectively.
1125 tid_t i_datasync_tid;
1128 struct dquot *i_dquot[MAXQUOTAS];
1131 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1138 * File system states
1140 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1141 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1142 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1145 * Misc. filesystem flags
1147 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1148 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1149 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1152 * Mount flags set via mount options or defaults
1154 #define EXT4_MOUNT_NO_MBCACHE 0x00001 /* Do not use mbcache */
1155 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1156 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1157 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1158 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1159 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1160 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1161 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1162 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1163 #ifdef CONFIG_FS_DAX
1164 #define EXT4_MOUNT_DAX_ALWAYS 0x00200 /* Direct Access */
1166 #define EXT4_MOUNT_DAX_ALWAYS 0
1168 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1169 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1170 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1171 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1172 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1173 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1174 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1175 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1176 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1177 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1178 #define EXT4_MOUNT_QUOTA 0x40000 /* Some quota option set */
1179 #define EXT4_MOUNT_USRQUOTA 0x80000 /* "old" user quota,
1180 * enable enforcement for hidden
1182 #define EXT4_MOUNT_GRPQUOTA 0x100000 /* "old" group quota, enable
1183 * enforcement for hidden quota
1185 #define EXT4_MOUNT_PRJQUOTA 0x200000 /* Enable project quota
1187 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1188 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1189 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1190 #define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
1191 #define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
1192 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1193 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1194 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1195 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1196 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1199 * Mount flags set either automatically (could not be set by mount option)
1200 * based on per file system feature or property or in special cases such as
1201 * distinguishing between explicit mount option definition and default.
1203 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1204 specified delalloc */
1205 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1206 size of blocksize * 8
1208 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1210 #define EXT4_MOUNT2_DAX_NEVER 0x00000008 /* Do not allow Direct Access */
1211 #define EXT4_MOUNT2_DAX_INODE 0x00000010 /* For printing options only */
1213 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1214 specified journal checksum */
1216 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1218 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1220 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1223 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1225 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1227 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1230 #define ext4_test_and_set_bit __test_and_set_bit_le
1231 #define ext4_set_bit __set_bit_le
1232 #define ext4_set_bit_atomic ext2_set_bit_atomic
1233 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1234 #define ext4_clear_bit __clear_bit_le
1235 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1236 #define ext4_test_bit test_bit_le
1237 #define ext4_find_next_zero_bit find_next_zero_bit_le
1238 #define ext4_find_next_bit find_next_bit_le
1240 extern void ext4_set_bits(void *bm, int cur, int len);
1243 * Maximal mount counts between two filesystem checks
1245 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1246 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1249 * Behaviour when detecting errors
1251 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1252 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1253 #define EXT4_ERRORS_PANIC 3 /* Panic */
1254 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1256 /* Metadata checksum algorithm codes */
1257 #define EXT4_CRC32C_CHKSUM 1
1260 * Structure of the super block
1262 struct ext4_super_block {
1263 /*00*/ __le32 s_inodes_count; /* Inodes count */
1264 __le32 s_blocks_count_lo; /* Blocks count */
1265 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1266 __le32 s_free_blocks_count_lo; /* Free blocks count */
1267 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1268 __le32 s_first_data_block; /* First Data Block */
1269 __le32 s_log_block_size; /* Block size */
1270 __le32 s_log_cluster_size; /* Allocation cluster size */
1271 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1272 __le32 s_clusters_per_group; /* # Clusters per group */
1273 __le32 s_inodes_per_group; /* # Inodes per group */
1274 __le32 s_mtime; /* Mount time */
1275 /*30*/ __le32 s_wtime; /* Write time */
1276 __le16 s_mnt_count; /* Mount count */
1277 __le16 s_max_mnt_count; /* Maximal mount count */
1278 __le16 s_magic; /* Magic signature */
1279 __le16 s_state; /* File system state */
1280 __le16 s_errors; /* Behaviour when detecting errors */
1281 __le16 s_minor_rev_level; /* minor revision level */
1282 /*40*/ __le32 s_lastcheck; /* time of last check */
1283 __le32 s_checkinterval; /* max. time between checks */
1284 __le32 s_creator_os; /* OS */
1285 __le32 s_rev_level; /* Revision level */
1286 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1287 __le16 s_def_resgid; /* Default gid for reserved blocks */
1289 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1291 * Note: the difference between the compatible feature set and
1292 * the incompatible feature set is that if there is a bit set
1293 * in the incompatible feature set that the kernel doesn't
1294 * know about, it should refuse to mount the filesystem.
1296 * e2fsck's requirements are more strict; if it doesn't know
1297 * about a feature in either the compatible or incompatible
1298 * feature set, it must abort and not try to meddle with
1299 * things it doesn't understand...
1301 __le32 s_first_ino; /* First non-reserved inode */
1302 __le16 s_inode_size; /* size of inode structure */
1303 __le16 s_block_group_nr; /* block group # of this superblock */
1304 __le32 s_feature_compat; /* compatible feature set */
1305 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1306 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1307 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1308 /*78*/ char s_volume_name[16]; /* volume name */
1309 /*88*/ char s_last_mounted[64] __nonstring; /* directory where last mounted */
1310 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1312 * Performance hints. Directory preallocation should only
1313 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1315 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1316 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1317 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1319 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1321 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1322 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1323 __le32 s_journal_dev; /* device number of journal file */
1324 __le32 s_last_orphan; /* start of list of inodes to delete */
1325 __le32 s_hash_seed[4]; /* HTREE hash seed */
1326 __u8 s_def_hash_version; /* Default hash version to use */
1327 __u8 s_jnl_backup_type;
1328 __le16 s_desc_size; /* size of group descriptor */
1329 /*100*/ __le32 s_default_mount_opts;
1330 __le32 s_first_meta_bg; /* First metablock block group */
1331 __le32 s_mkfs_time; /* When the filesystem was created */
1332 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1333 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1334 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1335 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1336 __le32 s_free_blocks_count_hi; /* Free blocks count */
1337 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1338 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1339 __le32 s_flags; /* Miscellaneous flags */
1340 __le16 s_raid_stride; /* RAID stride */
1341 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1342 __le64 s_mmp_block; /* Block for multi-mount protection */
1343 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1344 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1345 __u8 s_checksum_type; /* metadata checksum algorithm used */
1346 __u8 s_encryption_level; /* versioning level for encryption */
1347 __u8 s_reserved_pad; /* Padding to next 32bits */
1348 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1349 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1350 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1351 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1352 snapshot's future use */
1353 __le32 s_snapshot_list; /* inode number of the head of the
1354 on-disk snapshot list */
1355 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1356 __le32 s_error_count; /* number of fs errors */
1357 __le32 s_first_error_time; /* first time an error happened */
1358 __le32 s_first_error_ino; /* inode involved in first error */
1359 __le64 s_first_error_block; /* block involved of first error */
1360 __u8 s_first_error_func[32] __nonstring; /* function where the error happened */
1361 __le32 s_first_error_line; /* line number where error happened */
1362 __le32 s_last_error_time; /* most recent time of an error */
1363 __le32 s_last_error_ino; /* inode involved in last error */
1364 __le32 s_last_error_line; /* line number where error happened */
1365 __le64 s_last_error_block; /* block involved of last error */
1366 __u8 s_last_error_func[32] __nonstring; /* function where the error happened */
1367 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1368 __u8 s_mount_opts[64];
1369 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1370 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1371 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1372 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1373 __u8 s_encrypt_algos[4]; /* Encryption algorithms in use */
1374 __u8 s_encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
1375 __le32 s_lpf_ino; /* Location of the lost+found inode */
1376 __le32 s_prj_quota_inum; /* inode for tracking project quota */
1377 __le32 s_checksum_seed; /* crc32c(uuid) if csum_seed set */
1380 __u8 s_mkfs_time_hi;
1381 __u8 s_lastcheck_hi;
1382 __u8 s_first_error_time_hi;
1383 __u8 s_last_error_time_hi;
1384 __u8 s_first_error_errcode;
1385 __u8 s_last_error_errcode;
1386 __le16 s_encoding; /* Filename charset encoding */
1387 __le16 s_encoding_flags; /* Filename charset encoding flags */
1388 __le32 s_reserved[95]; /* Padding to the end of the block */
1389 __le32 s_checksum; /* crc32c(superblock) */
1392 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1397 * run-time mount flags
1399 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1400 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1402 #ifdef CONFIG_FS_ENCRYPTION
1403 #define DUMMY_ENCRYPTION_ENABLED(sbi) ((sbi)->s_dummy_enc_ctx.ctx != NULL)
1405 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1408 /* Number of quota types we support */
1409 #define EXT4_MAXQUOTAS 3
1411 #define EXT4_ENC_UTF8_12_1 1
1414 * Flags for ext4_sb_info.s_encoding_flags.
1416 #define EXT4_ENC_STRICT_MODE_FL (1 << 0)
1418 #define ext4_has_strict_mode(sbi) \
1419 (sbi->s_encoding_flags & EXT4_ENC_STRICT_MODE_FL)
1422 * fourth extended-fs super-block data in memory
1424 struct ext4_sb_info {
1425 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1426 unsigned long s_inodes_per_block;/* Number of inodes per block */
1427 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1428 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1429 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1430 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1431 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1432 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1433 ext4_group_t s_groups_count; /* Number of groups in the fs */
1434 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1435 unsigned long s_overhead; /* # of fs overhead clusters */
1436 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1437 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1438 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1439 struct buffer_head * s_sbh; /* Buffer containing the super block */
1440 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1441 struct buffer_head * __rcu *s_group_desc;
1442 unsigned int s_mount_opt;
1443 unsigned int s_mount_opt2;
1444 unsigned int s_mount_flags;
1445 unsigned int s_def_mount_opt;
1446 ext4_fsblk_t s_sb_block;
1447 atomic64_t s_resv_clusters;
1450 unsigned short s_mount_state;
1451 unsigned short s_pad;
1452 int s_addr_per_block_bits;
1453 int s_desc_per_block_bits;
1456 unsigned int s_inode_readahead_blks;
1457 unsigned int s_inode_goal;
1459 int s_def_hash_version;
1460 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1461 struct percpu_counter s_freeclusters_counter;
1462 struct percpu_counter s_freeinodes_counter;
1463 struct percpu_counter s_dirs_counter;
1464 struct percpu_counter s_dirtyclusters_counter;
1465 struct blockgroup_lock *s_blockgroup_lock;
1466 struct proc_dir_entry *s_proc;
1467 struct kobject s_kobj;
1468 struct completion s_kobj_unregister;
1469 struct super_block *s_sb;
1470 #ifdef CONFIG_UNICODE
1471 struct unicode_map *s_encoding;
1472 __u16 s_encoding_flags;
1476 struct journal_s *s_journal;
1477 struct list_head s_orphan;
1478 struct mutex s_orphan_lock;
1479 unsigned long s_ext4_flags; /* Ext4 superblock flags */
1480 unsigned long s_commit_interval;
1481 u32 s_max_batch_time;
1482 u32 s_min_batch_time;
1483 struct block_device *s_journal_bdev;
1485 /* Names of quota files with journalled quota */
1486 char __rcu *s_qf_names[EXT4_MAXQUOTAS];
1487 int s_jquota_fmt; /* Format of quota to use */
1489 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1490 struct ext4_system_blocks __rcu *s_system_blks;
1492 #ifdef EXTENTS_STATS
1493 /* ext4 extents stats */
1494 unsigned long s_ext_min;
1495 unsigned long s_ext_max;
1496 unsigned long s_depth_max;
1497 spinlock_t s_ext_stats_lock;
1498 unsigned long s_ext_blocks;
1499 unsigned long s_ext_extents;
1502 /* for buddy allocator */
1503 struct ext4_group_info ** __rcu *s_group_info;
1504 struct inode *s_buddy_cache;
1505 spinlock_t s_md_lock;
1506 unsigned short *s_mb_offsets;
1507 unsigned int *s_mb_maxs;
1508 unsigned int s_group_info_size;
1509 unsigned int s_mb_free_pending;
1510 struct list_head s_freed_data_list; /* List of blocks to be freed
1511 after commit completed */
1514 unsigned long s_stripe;
1515 unsigned int s_mb_stream_request;
1516 unsigned int s_mb_max_to_scan;
1517 unsigned int s_mb_min_to_scan;
1518 unsigned int s_mb_stats;
1519 unsigned int s_mb_order2_reqs;
1520 unsigned int s_mb_group_prealloc;
1521 unsigned int s_mb_max_inode_prealloc;
1522 unsigned int s_max_dir_size_kb;
1523 /* where last allocation was done - for stream allocation */
1524 unsigned long s_mb_last_group;
1525 unsigned long s_mb_last_start;
1526 unsigned int s_mb_prefetch;
1527 unsigned int s_mb_prefetch_limit;
1529 /* stats for buddy allocator */
1530 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1531 atomic_t s_bal_success; /* we found long enough chunks */
1532 atomic_t s_bal_allocated; /* in blocks */
1533 atomic_t s_bal_ex_scanned; /* total extents scanned */
1534 atomic_t s_bal_goals; /* goal hits */
1535 atomic_t s_bal_breaks; /* too long searches */
1536 atomic_t s_bal_2orders; /* 2^order hits */
1537 spinlock_t s_bal_lock;
1538 unsigned long s_mb_buddies_generated;
1539 unsigned long long s_mb_generation_time;
1540 atomic_t s_mb_lost_chunks;
1541 atomic_t s_mb_preallocated;
1542 atomic_t s_mb_discarded;
1543 atomic_t s_lock_busy;
1545 /* locality groups */
1546 struct ext4_locality_group __percpu *s_locality_groups;
1548 /* for write statistics */
1549 unsigned long s_sectors_written_start;
1550 u64 s_kbytes_written;
1552 /* the size of zero-out chunk */
1553 unsigned int s_extent_max_zeroout_kb;
1555 unsigned int s_log_groups_per_flex;
1556 struct flex_groups * __rcu *s_flex_groups;
1557 ext4_group_t s_flex_groups_allocated;
1559 /* workqueue for reserved extent conversions (buffered io) */
1560 struct workqueue_struct *rsv_conversion_wq;
1562 /* timer for periodic error stats printing */
1563 struct timer_list s_err_report;
1565 /* Lazy inode table initialization info */
1566 struct ext4_li_request *s_li_request;
1567 /* Wait multiplier for lazy initialization thread */
1568 unsigned int s_li_wait_mult;
1570 /* Kernel thread for multiple mount protection */
1571 struct task_struct *s_mmp_tsk;
1573 /* record the last minlen when FITRIM is called. */
1574 atomic_t s_last_trim_minblks;
1576 /* Reference to checksum algorithm driver via cryptoapi */
1577 struct crypto_shash *s_chksum_driver;
1579 /* Precomputed FS UUID checksum for seeding other checksums */
1582 /* Reclaim extents from extent status tree */
1583 struct shrinker s_es_shrinker;
1584 struct list_head s_es_list; /* List of inodes with reclaimable extents */
1586 struct ext4_es_stats s_es_stats;
1587 struct mb_cache *s_ea_block_cache;
1588 struct mb_cache *s_ea_inode_cache;
1589 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1591 /* Ratelimit ext4 messages. */
1592 struct ratelimit_state s_err_ratelimit_state;
1593 struct ratelimit_state s_warning_ratelimit_state;
1594 struct ratelimit_state s_msg_ratelimit_state;
1595 atomic_t s_warning_count;
1596 atomic_t s_msg_count;
1598 /* Encryption context for '-o test_dummy_encryption' */
1599 struct fscrypt_dummy_context s_dummy_enc_ctx;
1602 * Barrier between writepages ops and changing any inode's JOURNAL_DATA
1605 struct percpu_rw_semaphore s_writepages_rwsem;
1606 struct dax_device *s_daxdev;
1607 #ifdef CONFIG_EXT4_DEBUG
1608 unsigned long s_simulate_fail;
1610 /* Record the errseq of the backing block device */
1611 errseq_t s_bdev_wb_err;
1612 spinlock_t s_bdev_wb_lock;
1615 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1617 return sb->s_fs_info;
1619 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1621 return container_of(inode, struct ext4_inode_info, vfs_inode);
1624 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1626 return ino == EXT4_ROOT_INO ||
1627 (ino >= EXT4_FIRST_INO(sb) &&
1628 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1632 * Returns: sbi->field[index]
1633 * Used to access an array element from the following sbi fields which require
1634 * rcu protection to avoid dereferencing an invalid pointer due to reassignment
1639 #define sbi_array_rcu_deref(sbi, field, index) \
1641 typeof(*((sbi)->field)) _v; \
1643 _v = ((typeof(_v)*)rcu_dereference((sbi)->field))[index]; \
1644 rcu_read_unlock(); \
1649 * Simulate_fail codes
1651 #define EXT4_SIM_BBITMAP_EIO 1
1652 #define EXT4_SIM_BBITMAP_CRC 2
1653 #define EXT4_SIM_IBITMAP_EIO 3
1654 #define EXT4_SIM_IBITMAP_CRC 4
1655 #define EXT4_SIM_INODE_EIO 5
1656 #define EXT4_SIM_INODE_CRC 6
1657 #define EXT4_SIM_DIRBLOCK_EIO 7
1658 #define EXT4_SIM_DIRBLOCK_CRC 8
1660 static inline bool ext4_simulate_fail(struct super_block *sb,
1663 #ifdef CONFIG_EXT4_DEBUG
1664 struct ext4_sb_info *sbi = EXT4_SB(sb);
1666 if (unlikely(sbi->s_simulate_fail == code)) {
1667 sbi->s_simulate_fail = 0;
1674 static inline void ext4_simulate_fail_bh(struct super_block *sb,
1675 struct buffer_head *bh,
1678 if (!IS_ERR(bh) && ext4_simulate_fail(sb, code))
1679 clear_buffer_uptodate(bh);
1683 * Error number codes for s_{first,last}_error_errno
1685 * Linux errno numbers are architecture specific, so we need to translate
1686 * them into something which is architecture independent. We don't define
1687 * codes for all errno's; just the ones which are most likely to be the cause
1688 * of an ext4_error() call.
1690 #define EXT4_ERR_UNKNOWN 1
1691 #define EXT4_ERR_EIO 2
1692 #define EXT4_ERR_ENOMEM 3
1693 #define EXT4_ERR_EFSBADCRC 4
1694 #define EXT4_ERR_EFSCORRUPTED 5
1695 #define EXT4_ERR_ENOSPC 6
1696 #define EXT4_ERR_ENOKEY 7
1697 #define EXT4_ERR_EROFS 8
1698 #define EXT4_ERR_EFBIG 9
1699 #define EXT4_ERR_EEXIST 10
1700 #define EXT4_ERR_ERANGE 11
1701 #define EXT4_ERR_EOVERFLOW 12
1702 #define EXT4_ERR_EBUSY 13
1703 #define EXT4_ERR_ENOTDIR 14
1704 #define EXT4_ERR_ENOTEMPTY 15
1705 #define EXT4_ERR_ESHUTDOWN 16
1706 #define EXT4_ERR_EFAULT 17
1709 * Inode dynamic state flags
1712 EXT4_STATE_JDATA, /* journaled data exists */
1713 EXT4_STATE_NEW, /* inode is newly created */
1714 EXT4_STATE_XATTR, /* has in-inode xattrs */
1715 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1716 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1717 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1718 EXT4_STATE_NEWENTRY, /* File just added to dir */
1719 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1720 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1721 EXT4_STATE_LUSTRE_EA_INODE, /* Lustre-style ea_inode */
1722 EXT4_STATE_VERITY_IN_PROGRESS, /* building fs-verity Merkle tree */
1725 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1726 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1728 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1730 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1732 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1734 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1736 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1739 /* Add these declarations here only so that these functions can be
1740 * found by name. Otherwise, they are very hard to locate. */
1741 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1742 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1743 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1744 EXT4_INODE_BIT_FNS(flag, flags, 0)
1746 /* Add these declarations here only so that these functions can be
1747 * found by name. Otherwise, they are very hard to locate. */
1748 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1749 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1750 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1751 #if (BITS_PER_LONG < 64)
1752 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1754 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1756 (ei)->i_state_flags = 0;
1759 EXT4_INODE_BIT_FNS(state, flags, 32)
1761 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1763 /* We depend on the fact that callers will set i_flags */
1767 /* Assume that user mode programs are passing in an ext4fs superblock, not
1768 * a kernel struct super_block. This will allow us to call the feature-test
1769 * macros from user land. */
1770 #define EXT4_SB(sb) (sb)
1773 static inline bool ext4_verity_in_progress(struct inode *inode)
1775 return IS_ENABLED(CONFIG_FS_VERITY) &&
1776 ext4_test_inode_state(inode, EXT4_STATE_VERITY_IN_PROGRESS);
1779 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1782 * Codes for operating systems
1784 #define EXT4_OS_LINUX 0
1785 #define EXT4_OS_HURD 1
1786 #define EXT4_OS_MASIX 2
1787 #define EXT4_OS_FREEBSD 3
1788 #define EXT4_OS_LITES 4
1793 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1794 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1796 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1797 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1799 #define EXT4_GOOD_OLD_INODE_SIZE 128
1801 #define EXT4_EXTRA_TIMESTAMP_MAX (((s64)1 << 34) - 1 + S32_MIN)
1802 #define EXT4_NON_EXTRA_TIMESTAMP_MAX S32_MAX
1803 #define EXT4_TIMESTAMP_MIN S32_MIN
1806 * Feature set definitions
1809 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1810 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1811 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1812 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1813 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1814 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1815 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1816 #define EXT4_FEATURE_COMPAT_STABLE_INODES 0x0800
1818 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1819 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1820 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1821 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1822 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1823 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1824 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1825 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1826 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1828 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1829 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1830 * all other data structures' checksums. However, the METADATA_CSUM and
1831 * GDT_CSUM bits are mutually exclusive.
1833 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1834 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1835 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1836 #define EXT4_FEATURE_RO_COMPAT_VERITY 0x8000
1838 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1839 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1840 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1841 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1842 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1843 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1844 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1845 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1846 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1847 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1848 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1849 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1850 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1851 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1852 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1853 #define EXT4_FEATURE_INCOMPAT_CASEFOLD 0x20000
1855 extern void ext4_update_dynamic_rev(struct super_block *sb);
1857 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1858 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1860 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1861 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1863 static inline void ext4_set_feature_##name(struct super_block *sb) \
1865 ext4_update_dynamic_rev(sb); \
1866 EXT4_SB(sb)->s_es->s_feature_compat |= \
1867 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1869 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1871 EXT4_SB(sb)->s_es->s_feature_compat &= \
1872 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1875 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1876 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1878 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1879 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1881 static inline void ext4_set_feature_##name(struct super_block *sb) \
1883 ext4_update_dynamic_rev(sb); \
1884 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1885 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1887 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1889 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1890 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1893 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1894 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1896 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1897 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1899 static inline void ext4_set_feature_##name(struct super_block *sb) \
1901 ext4_update_dynamic_rev(sb); \
1902 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1903 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1905 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1907 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1908 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1911 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc, DIR_PREALLOC)
1912 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes, IMAGIC_INODES)
1913 EXT4_FEATURE_COMPAT_FUNCS(journal, HAS_JOURNAL)
1914 EXT4_FEATURE_COMPAT_FUNCS(xattr, EXT_ATTR)
1915 EXT4_FEATURE_COMPAT_FUNCS(resize_inode, RESIZE_INODE)
1916 EXT4_FEATURE_COMPAT_FUNCS(dir_index, DIR_INDEX)
1917 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2, SPARSE_SUPER2)
1918 EXT4_FEATURE_COMPAT_FUNCS(stable_inodes, STABLE_INODES)
1920 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super, SPARSE_SUPER)
1921 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file, LARGE_FILE)
1922 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir, BTREE_DIR)
1923 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file, HUGE_FILE)
1924 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum, GDT_CSUM)
1925 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink, DIR_NLINK)
1926 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize, EXTRA_ISIZE)
1927 EXT4_FEATURE_RO_COMPAT_FUNCS(quota, QUOTA)
1928 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc, BIGALLOC)
1929 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum, METADATA_CSUM)
1930 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly, READONLY)
1931 EXT4_FEATURE_RO_COMPAT_FUNCS(project, PROJECT)
1932 EXT4_FEATURE_RO_COMPAT_FUNCS(verity, VERITY)
1934 EXT4_FEATURE_INCOMPAT_FUNCS(compression, COMPRESSION)
1935 EXT4_FEATURE_INCOMPAT_FUNCS(filetype, FILETYPE)
1936 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery, RECOVER)
1937 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev, JOURNAL_DEV)
1938 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg, META_BG)
1939 EXT4_FEATURE_INCOMPAT_FUNCS(extents, EXTENTS)
1940 EXT4_FEATURE_INCOMPAT_FUNCS(64bit, 64BIT)
1941 EXT4_FEATURE_INCOMPAT_FUNCS(mmp, MMP)
1942 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg, FLEX_BG)
1943 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode, EA_INODE)
1944 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata, DIRDATA)
1945 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed, CSUM_SEED)
1946 EXT4_FEATURE_INCOMPAT_FUNCS(largedir, LARGEDIR)
1947 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data, INLINE_DATA)
1948 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt, ENCRYPT)
1949 EXT4_FEATURE_INCOMPAT_FUNCS(casefold, CASEFOLD)
1951 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1952 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1953 EXT4_FEATURE_INCOMPAT_META_BG)
1954 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1955 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1956 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1958 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1959 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1960 EXT4_FEATURE_INCOMPAT_RECOVER| \
1961 EXT4_FEATURE_INCOMPAT_META_BG)
1962 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1963 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1964 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1966 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1967 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1968 EXT4_FEATURE_INCOMPAT_RECOVER| \
1969 EXT4_FEATURE_INCOMPAT_META_BG| \
1970 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1971 EXT4_FEATURE_INCOMPAT_64BIT| \
1972 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1973 EXT4_FEATURE_INCOMPAT_EA_INODE| \
1974 EXT4_FEATURE_INCOMPAT_MMP | \
1975 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1976 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1977 EXT4_FEATURE_INCOMPAT_CASEFOLD | \
1978 EXT4_FEATURE_INCOMPAT_CSUM_SEED | \
1979 EXT4_FEATURE_INCOMPAT_LARGEDIR)
1980 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1981 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1982 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1983 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1984 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1985 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1986 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1987 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1988 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1989 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1990 EXT4_FEATURE_RO_COMPAT_PROJECT |\
1991 EXT4_FEATURE_RO_COMPAT_VERITY)
1993 #define EXTN_FEATURE_FUNCS(ver) \
1994 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1996 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1997 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1999 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
2001 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
2002 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
2004 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
2006 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
2007 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
2010 EXTN_FEATURE_FUNCS(2)
2011 EXTN_FEATURE_FUNCS(3)
2012 EXTN_FEATURE_FUNCS(4)
2014 static inline bool ext4_has_compat_features(struct super_block *sb)
2016 return (EXT4_SB(sb)->s_es->s_feature_compat != 0);
2018 static inline bool ext4_has_ro_compat_features(struct super_block *sb)
2020 return (EXT4_SB(sb)->s_es->s_feature_ro_compat != 0);
2022 static inline bool ext4_has_incompat_features(struct super_block *sb)
2024 return (EXT4_SB(sb)->s_es->s_feature_incompat != 0);
2030 #define EXT4_FLAGS_RESIZING 0
2031 #define EXT4_FLAGS_SHUTDOWN 1
2032 #define EXT4_FLAGS_BDEV_IS_DAX 2
2034 static inline int ext4_forced_shutdown(struct ext4_sb_info *sbi)
2036 return test_bit(EXT4_FLAGS_SHUTDOWN, &sbi->s_ext4_flags);
2041 * Default values for user and/or group using reserved blocks
2043 #define EXT4_DEF_RESUID 0
2044 #define EXT4_DEF_RESGID 0
2047 * Default project ID
2049 #define EXT4_DEF_PROJID 0
2051 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
2054 * Default mount options
2056 #define EXT4_DEFM_DEBUG 0x0001
2057 #define EXT4_DEFM_BSDGROUPS 0x0002
2058 #define EXT4_DEFM_XATTR_USER 0x0004
2059 #define EXT4_DEFM_ACL 0x0008
2060 #define EXT4_DEFM_UID16 0x0010
2061 #define EXT4_DEFM_JMODE 0x0060
2062 #define EXT4_DEFM_JMODE_DATA 0x0020
2063 #define EXT4_DEFM_JMODE_ORDERED 0x0040
2064 #define EXT4_DEFM_JMODE_WBACK 0x0060
2065 #define EXT4_DEFM_NOBARRIER 0x0100
2066 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
2067 #define EXT4_DEFM_DISCARD 0x0400
2068 #define EXT4_DEFM_NODELALLOC 0x0800
2071 * Default journal batch times
2073 #define EXT4_DEF_MIN_BATCH_TIME 0
2074 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
2077 * Minimum number of groups in a flexgroup before we separate out
2078 * directories into the first block group of a flexgroup
2080 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
2083 * Structure of a directory entry
2085 #define EXT4_NAME_LEN 255
2087 struct ext4_dir_entry {
2088 __le32 inode; /* Inode number */
2089 __le16 rec_len; /* Directory entry length */
2090 __le16 name_len; /* Name length */
2091 char name[EXT4_NAME_LEN]; /* File name */
2095 * The new version of the directory entry. Since EXT4 structures are
2096 * stored in intel byte order, and the name_len field could never be
2097 * bigger than 255 chars, it's safe to reclaim the extra byte for the
2100 struct ext4_dir_entry_2 {
2101 __le32 inode; /* Inode number */
2102 __le16 rec_len; /* Directory entry length */
2103 __u8 name_len; /* Name length */
2104 __u8 file_type; /* See file type macros EXT4_FT_* below */
2105 char name[EXT4_NAME_LEN]; /* File name */
2109 * This is a bogus directory entry at the end of each leaf block that
2110 * records checksums.
2112 struct ext4_dir_entry_tail {
2113 __le32 det_reserved_zero1; /* Pretend to be unused */
2114 __le16 det_rec_len; /* 12 */
2115 __u8 det_reserved_zero2; /* Zero name length */
2116 __u8 det_reserved_ft; /* 0xDE, fake file type */
2117 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
2120 #define EXT4_DIRENT_TAIL(block, blocksize) \
2121 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
2123 sizeof(struct ext4_dir_entry_tail))))
2126 * Ext4 directory file types. Only the low 3 bits are used. The
2127 * other bits are reserved for now.
2129 #define EXT4_FT_UNKNOWN 0
2130 #define EXT4_FT_REG_FILE 1
2131 #define EXT4_FT_DIR 2
2132 #define EXT4_FT_CHRDEV 3
2133 #define EXT4_FT_BLKDEV 4
2134 #define EXT4_FT_FIFO 5
2135 #define EXT4_FT_SOCK 6
2136 #define EXT4_FT_SYMLINK 7
2138 #define EXT4_FT_MAX 8
2140 #define EXT4_FT_DIR_CSUM 0xDE
2143 * EXT4_DIR_PAD defines the directory entries boundaries
2145 * NOTE: It must be a multiple of 4
2147 #define EXT4_DIR_PAD 4
2148 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
2149 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
2151 #define EXT4_MAX_REC_LEN ((1<<16)-1)
2154 * If we ever get support for fs block sizes > page_size, we'll need
2155 * to remove the #if statements in the next two functions...
2157 static inline unsigned int
2158 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
2160 unsigned len = le16_to_cpu(dlen);
2162 #if (PAGE_SIZE >= 65536)
2163 if (len == EXT4_MAX_REC_LEN || len == 0)
2165 return (len & 65532) | ((len & 3) << 16);
2171 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
2173 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
2175 #if (PAGE_SIZE >= 65536)
2177 return cpu_to_le16(len);
2178 if (len == blocksize) {
2179 if (blocksize == 65536)
2180 return cpu_to_le16(EXT4_MAX_REC_LEN);
2182 return cpu_to_le16(0);
2184 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
2186 return cpu_to_le16(len);
2191 * Hash Tree Directory indexing
2192 * (c) Daniel Phillips, 2001
2195 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2196 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2197 #define EXT4_DIR_LINK_MAX(dir) unlikely((dir)->i_nlink >= EXT4_LINK_MAX && \
2198 !(ext4_has_feature_dir_nlink((dir)->i_sb) && is_dx(dir)))
2199 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2201 /* Legal values for the dx_root hash_version field: */
2203 #define DX_HASH_LEGACY 0
2204 #define DX_HASH_HALF_MD4 1
2205 #define DX_HASH_TEA 2
2206 #define DX_HASH_LEGACY_UNSIGNED 3
2207 #define DX_HASH_HALF_MD4_UNSIGNED 4
2208 #define DX_HASH_TEA_UNSIGNED 5
2210 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
2211 const void *address, unsigned int length)
2214 struct shash_desc shash;
2218 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
2220 desc.shash.tfm = sbi->s_chksum_driver;
2221 *(u32 *)desc.ctx = crc;
2223 BUG_ON(crypto_shash_update(&desc.shash, address, length));
2225 return *(u32 *)desc.ctx;
2230 /* hash info structure used by the directory hash */
2240 /* 32 and 64 bit signed EOF for dx directories */
2241 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2242 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2246 * Control parameters used by ext4_htree_next_block
2248 #define HASH_NB_ALWAYS 1
2250 struct ext4_filename {
2251 const struct qstr *usr_fname;
2252 struct fscrypt_str disk_name;
2253 struct dx_hash_info hinfo;
2254 #ifdef CONFIG_FS_ENCRYPTION
2255 struct fscrypt_str crypto_buf;
2257 #ifdef CONFIG_UNICODE
2258 struct fscrypt_str cf_name;
2262 #define fname_name(p) ((p)->disk_name.name)
2263 #define fname_len(p) ((p)->disk_name.len)
2266 * Describe an inode's exact location on disk and in memory
2270 struct buffer_head *bh;
2271 unsigned long offset;
2272 ext4_group_t block_group;
2275 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
2277 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
2280 static inline bool ext4_is_quota_file(struct inode *inode)
2282 return IS_NOQUOTA(inode) &&
2283 !(EXT4_I(inode)->i_flags & EXT4_EA_INODE_FL);
2287 * This structure is stuffed into the struct file's private_data field
2288 * for directories. It is where we put information so that we can do
2289 * readdir operations in hash tree order.
2291 struct dir_private_info {
2292 struct rb_root root;
2293 struct rb_node *curr_node;
2294 struct fname *extra_fname;
2297 __u32 curr_minor_hash;
2301 /* calculate the first block number of the group */
2302 static inline ext4_fsblk_t
2303 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
2305 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
2306 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
2310 * Special error return code only used by dx_probe() and its callers.
2312 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2314 /* htree levels for ext4 */
2315 #define EXT4_HTREE_LEVEL_COMPAT 2
2316 #define EXT4_HTREE_LEVEL 3
2318 static inline int ext4_dir_htree_level(struct super_block *sb)
2320 return ext4_has_feature_largedir(sb) ?
2321 EXT4_HTREE_LEVEL : EXT4_HTREE_LEVEL_COMPAT;
2325 * Timeout and state flag for lazy initialization inode thread.
2327 #define EXT4_DEF_LI_WAIT_MULT 10
2328 #define EXT4_DEF_LI_MAX_START_DELAY 5
2329 #define EXT4_LAZYINIT_QUIT 0x0001
2330 #define EXT4_LAZYINIT_RUNNING 0x0002
2333 * Lazy inode table initialization info
2335 struct ext4_lazy_init {
2336 unsigned long li_state;
2337 struct list_head li_request_list;
2338 struct mutex li_list_mtx;
2342 EXT4_LI_MODE_PREFETCH_BBITMAP,
2343 EXT4_LI_MODE_ITABLE,
2346 struct ext4_li_request {
2347 struct super_block *lr_super;
2348 enum ext4_li_mode lr_mode;
2349 ext4_group_t lr_first_not_zeroed;
2350 ext4_group_t lr_next_group;
2351 struct list_head lr_request;
2352 unsigned long lr_next_sched;
2353 unsigned long lr_timeout;
2356 struct ext4_features {
2357 struct kobject f_kobj;
2358 struct completion f_kobj_unregister;
2362 * This structure will be used for multiple mount protection. It will be
2363 * written into the block number saved in the s_mmp_block field in the
2364 * superblock. Programs that check MMP should assume that if
2365 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2366 * to use the filesystem, regardless of how old the timestamp is.
2368 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2369 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2370 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2371 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2374 __le32 mmp_magic; /* Magic number for MMP */
2375 __le32 mmp_seq; /* Sequence no. updated periodically */
2378 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2379 * purposes and do not affect the correctness of the algorithm
2381 __le64 mmp_time; /* Time last updated */
2382 char mmp_nodename[64]; /* Node which last updated MMP block */
2383 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
2386 * mmp_check_interval is used to verify if the MMP block has been
2387 * updated on the block device. The value is updated based on the
2388 * maximum time to write the MMP block during an update cycle.
2390 __le16 mmp_check_interval;
2393 __le32 mmp_pad2[226];
2394 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
2397 /* arguments passed to the mmp thread */
2399 struct buffer_head *bh; /* bh from initial read_mmp_block() */
2400 struct super_block *sb; /* super block of the fs */
2404 * Check interval multiplier
2405 * The MMP block is written every update interval and initially checked every
2406 * update interval x the multiplier (the value is then adapted based on the
2407 * write latency). The reason is that writes can be delayed under load and we
2408 * don't want readers to incorrectly assume that the filesystem is no longer
2411 #define EXT4_MMP_CHECK_MULT 2UL
2414 * Minimum interval for MMP checking in seconds.
2416 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2419 * Maximum interval for MMP checking in seconds.
2421 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2424 * Function prototypes
2428 * Ok, these declarations are also in <linux/kernel.h> but none of the
2429 * ext4 source programs needs to include it so they are duplicated here.
2431 # define NORET_TYPE /**/
2432 # define ATTRIB_NORET __attribute__((noreturn))
2433 # define NORET_AND noreturn,
2436 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
2437 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2438 struct ext4_group_desc *gdp,
2439 struct buffer_head *bh, int sz);
2440 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2441 struct ext4_group_desc *gdp,
2442 struct buffer_head *bh, int sz);
2443 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
2444 struct ext4_group_desc *gdp,
2445 struct buffer_head *bh);
2446 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
2447 struct ext4_group_desc *gdp,
2448 struct buffer_head *bh);
2451 extern void ext4_get_group_no_and_offset(struct super_block *sb,
2452 ext4_fsblk_t blocknr,
2453 ext4_group_t *blockgrpp,
2454 ext4_grpblk_t *offsetp);
2455 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
2456 ext4_fsblk_t block);
2458 extern unsigned int ext4_block_group(struct super_block *sb,
2459 ext4_fsblk_t blocknr);
2460 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
2461 ext4_fsblk_t blocknr);
2462 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
2463 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
2464 ext4_group_t group);
2465 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
2468 unsigned long *count,
2470 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
2471 s64 nclusters, unsigned int flags);
2472 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
2473 extern void ext4_check_blocks_bitmap(struct super_block *);
2474 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
2475 ext4_group_t block_group,
2476 struct buffer_head ** bh);
2477 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
2479 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
2480 ext4_group_t block_group,
2481 bool ignore_locked);
2482 extern int ext4_wait_block_bitmap(struct super_block *sb,
2483 ext4_group_t block_group,
2484 struct buffer_head *bh);
2485 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
2486 ext4_group_t block_group);
2487 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
2488 ext4_group_t block_group,
2489 struct ext4_group_desc *gdp);
2490 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2492 #ifdef CONFIG_UNICODE
2493 extern void ext4_fname_setup_ci_filename(struct inode *dir,
2494 const struct qstr *iname,
2495 struct fscrypt_str *fname);
2498 #ifdef CONFIG_FS_ENCRYPTION
2499 static inline void ext4_fname_from_fscrypt_name(struct ext4_filename *dst,
2500 const struct fscrypt_name *src)
2502 memset(dst, 0, sizeof(*dst));
2504 dst->usr_fname = src->usr_fname;
2505 dst->disk_name = src->disk_name;
2506 dst->hinfo.hash = src->hash;
2507 dst->hinfo.minor_hash = src->minor_hash;
2508 dst->crypto_buf = src->crypto_buf;
2511 static inline int ext4_fname_setup_filename(struct inode *dir,
2512 const struct qstr *iname,
2514 struct ext4_filename *fname)
2516 struct fscrypt_name name;
2519 err = fscrypt_setup_filename(dir, iname, lookup, &name);
2523 ext4_fname_from_fscrypt_name(fname, &name);
2525 #ifdef CONFIG_UNICODE
2526 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2531 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2532 struct dentry *dentry,
2533 struct ext4_filename *fname)
2535 struct fscrypt_name name;
2538 err = fscrypt_prepare_lookup(dir, dentry, &name);
2542 ext4_fname_from_fscrypt_name(fname, &name);
2544 #ifdef CONFIG_UNICODE
2545 ext4_fname_setup_ci_filename(dir, &dentry->d_name, &fname->cf_name);
2550 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2552 struct fscrypt_name name;
2554 name.crypto_buf = fname->crypto_buf;
2555 fscrypt_free_filename(&name);
2557 fname->crypto_buf.name = NULL;
2558 fname->usr_fname = NULL;
2559 fname->disk_name.name = NULL;
2561 #ifdef CONFIG_UNICODE
2562 kfree(fname->cf_name.name);
2563 fname->cf_name.name = NULL;
2566 #else /* !CONFIG_FS_ENCRYPTION */
2567 static inline int ext4_fname_setup_filename(struct inode *dir,
2568 const struct qstr *iname,
2570 struct ext4_filename *fname)
2572 fname->usr_fname = iname;
2573 fname->disk_name.name = (unsigned char *) iname->name;
2574 fname->disk_name.len = iname->len;
2576 #ifdef CONFIG_UNICODE
2577 ext4_fname_setup_ci_filename(dir, iname, &fname->cf_name);
2583 static inline int ext4_fname_prepare_lookup(struct inode *dir,
2584 struct dentry *dentry,
2585 struct ext4_filename *fname)
2587 return ext4_fname_setup_filename(dir, &dentry->d_name, 1, fname);
2590 static inline void ext4_fname_free_filename(struct ext4_filename *fname)
2592 #ifdef CONFIG_UNICODE
2593 kfree(fname->cf_name.name);
2594 fname->cf_name.name = NULL;
2597 #endif /* !CONFIG_FS_ENCRYPTION */
2600 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2602 struct ext4_dir_entry_2 *,
2603 struct buffer_head *, char *, int,
2605 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2606 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2607 (de), (bh), (buf), (size), (offset)))
2608 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2610 struct ext4_dir_entry_2 *dirent,
2611 struct fscrypt_str *ent_name);
2612 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2613 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2614 struct buffer_head *bh,
2615 void *buf, int buf_size,
2616 struct ext4_filename *fname,
2617 struct ext4_dir_entry_2 **dest_de);
2618 void ext4_insert_dentry(struct inode *inode,
2619 struct ext4_dir_entry_2 *de,
2621 struct ext4_filename *fname);
2622 static inline void ext4_update_dx_flag(struct inode *inode)
2624 if (!ext4_has_feature_dir_index(inode->i_sb)) {
2625 /* ext4_iget() should have caught this... */
2626 WARN_ON_ONCE(ext4_has_feature_metadata_csum(inode->i_sb));
2627 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2630 static const unsigned char ext4_filetype_table[] = {
2631 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2634 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2636 if (!ext4_has_feature_filetype(sb) || filetype >= EXT4_FT_MAX)
2639 return ext4_filetype_table[filetype];
2641 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2642 void *buf, int buf_size);
2645 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2648 extern int ext4fs_dirhash(const struct inode *dir, const char *name, int len,
2649 struct dx_hash_info *hinfo);
2652 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2653 const struct qstr *qstr, __u32 goal,
2654 uid_t *owner, __u32 i_flags,
2655 int handle_type, unsigned int line_no,
2658 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner, i_flags) \
2659 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2661 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2663 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2664 0, (type), __LINE__, (nblocks))
2667 extern void ext4_free_inode(handle_t *, struct inode *);
2668 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2669 extern unsigned long ext4_count_free_inodes(struct super_block *);
2670 extern unsigned long ext4_count_dirs(struct super_block *);
2671 extern void ext4_check_inodes_bitmap(struct super_block *);
2672 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2673 extern int ext4_init_inode_table(struct super_block *sb,
2674 ext4_group_t group, int barrier);
2675 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2678 extern const struct seq_operations ext4_mb_seq_groups_ops;
2679 extern long ext4_mb_stats;
2680 extern long ext4_mb_max_to_scan;
2681 extern int ext4_mb_init(struct super_block *);
2682 extern int ext4_mb_release(struct super_block *);
2683 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2684 struct ext4_allocation_request *, int *);
2685 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2686 extern void ext4_discard_preallocations(struct inode *, unsigned int);
2687 extern int __init ext4_init_mballoc(void);
2688 extern void ext4_exit_mballoc(void);
2689 extern ext4_group_t ext4_mb_prefetch(struct super_block *sb,
2691 unsigned int nr, int *cnt);
2692 extern void ext4_mb_prefetch_fini(struct super_block *sb, ext4_group_t group,
2695 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2696 struct buffer_head *bh, ext4_fsblk_t block,
2697 unsigned long count, int flags);
2698 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2699 ext4_group_t ngroups);
2700 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2701 ext4_group_t i, struct ext4_group_desc *desc);
2702 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2703 ext4_fsblk_t block, unsigned long count);
2704 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2705 extern void ext4_process_freed_data(struct super_block *sb, tid_t commit_tid);
2708 int ext4_inode_is_fast_symlink(struct inode *inode);
2709 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2710 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2711 int ext4_bread_batch(struct inode *inode, ext4_lblk_t block, int bh_count,
2712 bool wait, struct buffer_head **bhs);
2713 int ext4_get_block_unwritten(struct inode *inode, sector_t iblock,
2714 struct buffer_head *bh_result, int create);
2715 int ext4_get_block(struct inode *inode, sector_t iblock,
2716 struct buffer_head *bh_result, int create);
2717 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2718 struct buffer_head *bh, int create);
2719 int ext4_walk_page_buffers(handle_t *handle,
2720 struct buffer_head *head,
2724 int (*fn)(handle_t *handle,
2725 struct buffer_head *bh));
2726 int do_journal_get_write_access(handle_t *handle,
2727 struct buffer_head *bh);
2728 #define FALL_BACK_TO_NONDELALLOC 1
2729 #define CONVERT_INLINE_DATA 2
2732 EXT4_IGET_NORMAL = 0,
2733 EXT4_IGET_SPECIAL = 0x0001, /* OK to iget a system inode */
2734 EXT4_IGET_HANDLE = 0x0002 /* Inode # is from a handle */
2737 extern struct inode *__ext4_iget(struct super_block *sb, unsigned long ino,
2738 ext4_iget_flags flags, const char *function,
2741 #define ext4_iget(sb, ino, flags) \
2742 __ext4_iget((sb), (ino), (flags), __func__, __LINE__)
2744 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2745 extern int ext4_setattr(struct dentry *, struct iattr *);
2746 extern int ext4_getattr(const struct path *, struct kstat *, u32, unsigned int);
2747 extern void ext4_evict_inode(struct inode *);
2748 extern void ext4_clear_inode(struct inode *);
2749 extern int ext4_file_getattr(const struct path *, struct kstat *, u32, unsigned int);
2750 extern int ext4_sync_inode(handle_t *, struct inode *);
2751 extern void ext4_dirty_inode(struct inode *, int);
2752 extern int ext4_change_inode_journal_flag(struct inode *, int);
2753 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2754 extern int ext4_inode_attach_jinode(struct inode *inode);
2755 extern int ext4_can_truncate(struct inode *inode);
2756 extern int ext4_truncate(struct inode *);
2757 extern int ext4_break_layouts(struct inode *);
2758 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2759 extern void ext4_set_inode_flags(struct inode *, bool init);
2760 extern int ext4_alloc_da_blocks(struct inode *inode);
2761 extern void ext4_set_aops(struct inode *inode);
2762 extern int ext4_writepage_trans_blocks(struct inode *);
2763 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2764 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2765 loff_t lstart, loff_t lend);
2766 extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
2767 extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
2768 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2769 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
2770 extern void ext4_da_release_space(struct inode *inode, int to_free);
2771 extern void ext4_da_update_reserve_space(struct inode *inode,
2772 int used, int quota_claim);
2773 extern int ext4_issue_zeroout(struct inode *inode, ext4_lblk_t lblk,
2774 ext4_fsblk_t pblk, ext4_lblk_t len);
2777 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2778 struct ext4_map_blocks *map, int flags);
2779 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2780 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2781 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2782 ext4_lblk_t start, ext4_lblk_t end);
2785 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2786 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2789 extern int ext4_ext_migrate(struct inode *);
2790 extern int ext4_ind_migrate(struct inode *inode);
2793 extern int ext4_dirblock_csum_verify(struct inode *inode,
2794 struct buffer_head *bh);
2795 extern int ext4_orphan_add(handle_t *, struct inode *);
2796 extern int ext4_orphan_del(handle_t *, struct inode *);
2797 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2798 __u32 start_minor_hash, __u32 *next_hash);
2799 extern int ext4_search_dir(struct buffer_head *bh,
2803 struct ext4_filename *fname,
2804 unsigned int offset,
2805 struct ext4_dir_entry_2 **res_dir);
2806 extern int ext4_generic_delete_entry(struct inode *dir,
2807 struct ext4_dir_entry_2 *de_del,
2808 struct buffer_head *bh,
2812 extern bool ext4_empty_dir(struct inode *inode);
2815 extern void ext4_kvfree_array_rcu(void *to_free);
2816 extern int ext4_group_add(struct super_block *sb,
2817 struct ext4_new_group_data *input);
2818 extern int ext4_group_extend(struct super_block *sb,
2819 struct ext4_super_block *es,
2820 ext4_fsblk_t n_blocks_count);
2821 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2824 extern struct buffer_head *ext4_sb_bread(struct super_block *sb,
2825 sector_t block, int op_flags);
2826 extern int ext4_seq_options_show(struct seq_file *seq, void *offset);
2827 extern int ext4_calculate_overhead(struct super_block *sb);
2828 extern void ext4_superblock_csum_set(struct super_block *sb);
2829 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2830 ext4_group_t ngroup);
2831 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2833 extern void ext4_mark_group_bitmap_corrupted(struct super_block *sb,
2834 ext4_group_t block_group,
2835 unsigned int flags);
2837 extern __printf(6, 7)
2838 void __ext4_error(struct super_block *, const char *, unsigned int, int, __u64,
2840 extern __printf(6, 7)
2841 void __ext4_error_inode(struct inode *, const char *, unsigned int,
2842 ext4_fsblk_t, int, const char *, ...);
2843 extern __printf(5, 6)
2844 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2846 extern void __ext4_std_error(struct super_block *, const char *,
2848 extern __printf(5, 6)
2849 void __ext4_abort(struct super_block *, const char *, unsigned int, int,
2851 extern __printf(4, 5)
2852 void __ext4_warning(struct super_block *, const char *, unsigned int,
2854 extern __printf(4, 5)
2855 void __ext4_warning_inode(const struct inode *inode, const char *function,
2856 unsigned int line, const char *fmt, ...);
2857 extern __printf(3, 4)
2858 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2859 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2860 const char *, unsigned int, const char *);
2861 extern __printf(7, 8)
2862 void __ext4_grp_locked_error(const char *, unsigned int,
2863 struct super_block *, ext4_group_t,
2864 unsigned long, ext4_fsblk_t,
2867 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2868 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2870 #define EXT4_ERROR_INODE_ERR(inode, err, fmt, a...) \
2871 __ext4_error_inode((inode), __func__, __LINE__, 0, (err), (fmt), ## a)
2873 #define ext4_error_inode_block(inode, block, err, fmt, a...) \
2874 __ext4_error_inode((inode), __func__, __LINE__, (block), (err), \
2877 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
2878 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2880 #ifdef CONFIG_PRINTK
2882 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2883 __ext4_error_inode(inode, func, line, block, 0, fmt, ##__VA_ARGS__)
2884 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
2885 __ext4_error_inode((inode), (func), (line), (block), \
2886 (err), (fmt), ##__VA_ARGS__)
2887 #define ext4_error_file(file, func, line, block, fmt, ...) \
2888 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2889 #define ext4_error(sb, fmt, ...) \
2890 __ext4_error((sb), __func__, __LINE__, 0, 0, (fmt), ##__VA_ARGS__)
2891 #define ext4_error_err(sb, err, fmt, ...) \
2892 __ext4_error((sb), __func__, __LINE__, (err), 0, (fmt), ##__VA_ARGS__)
2893 #define ext4_abort(sb, err, fmt, ...) \
2894 __ext4_abort((sb), __func__, __LINE__, (err), (fmt), ##__VA_ARGS__)
2895 #define ext4_warning(sb, fmt, ...) \
2896 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2897 #define ext4_warning_inode(inode, fmt, ...) \
2898 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2899 #define ext4_msg(sb, level, fmt, ...) \
2900 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2901 #define dump_mmp_msg(sb, mmp, msg) \
2902 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2903 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2904 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2909 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2911 no_printk(fmt, ##__VA_ARGS__); \
2912 __ext4_error_inode(inode, "", 0, block, 0, " "); \
2914 #define ext4_error_inode_err(inode, func, line, block, err, fmt, ...) \
2916 no_printk(fmt, ##__VA_ARGS__); \
2917 __ext4_error_inode(inode, "", 0, block, err, " "); \
2919 #define ext4_error_file(file, func, line, block, fmt, ...) \
2921 no_printk(fmt, ##__VA_ARGS__); \
2922 __ext4_error_file(file, "", 0, block, " "); \
2924 #define ext4_error(sb, fmt, ...) \
2926 no_printk(fmt, ##__VA_ARGS__); \
2927 __ext4_error(sb, "", 0, 0, 0, " "); \
2929 #define ext4_error_err(sb, err, fmt, ...) \
2931 no_printk(fmt, ##__VA_ARGS__); \
2932 __ext4_error(sb, "", 0, err, 0, " "); \
2934 #define ext4_abort(sb, err, fmt, ...) \
2936 no_printk(fmt, ##__VA_ARGS__); \
2937 __ext4_abort(sb, "", 0, err, " "); \
2939 #define ext4_warning(sb, fmt, ...) \
2941 no_printk(fmt, ##__VA_ARGS__); \
2942 __ext4_warning(sb, "", 0, " "); \
2944 #define ext4_warning_inode(inode, fmt, ...) \
2946 no_printk(fmt, ##__VA_ARGS__); \
2947 __ext4_warning_inode(inode, "", 0, " "); \
2949 #define ext4_msg(sb, level, fmt, ...) \
2951 no_printk(fmt, ##__VA_ARGS__); \
2952 __ext4_msg(sb, "", " "); \
2954 #define dump_mmp_msg(sb, mmp, msg) \
2955 __dump_mmp_msg(sb, mmp, "", 0, "")
2956 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2958 no_printk(fmt, ##__VA_ARGS__); \
2959 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2964 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2965 struct ext4_group_desc *bg);
2966 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2967 struct ext4_group_desc *bg);
2968 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2969 struct ext4_group_desc *bg);
2970 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2971 struct ext4_group_desc *bg);
2972 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2973 struct ext4_group_desc *bg);
2974 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2975 struct ext4_group_desc *bg);
2976 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2977 struct ext4_group_desc *bg);
2978 extern void ext4_block_bitmap_set(struct super_block *sb,
2979 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2980 extern void ext4_inode_bitmap_set(struct super_block *sb,
2981 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2982 extern void ext4_inode_table_set(struct super_block *sb,
2983 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2984 extern void ext4_free_group_clusters_set(struct super_block *sb,
2985 struct ext4_group_desc *bg,
2987 extern void ext4_free_inodes_set(struct super_block *sb,
2988 struct ext4_group_desc *bg, __u32 count);
2989 extern void ext4_used_dirs_set(struct super_block *sb,
2990 struct ext4_group_desc *bg, __u32 count);
2991 extern void ext4_itable_unused_set(struct super_block *sb,
2992 struct ext4_group_desc *bg, __u32 count);
2993 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2994 struct ext4_group_desc *gdp);
2995 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2996 struct ext4_group_desc *gdp);
2997 extern int ext4_register_li_request(struct super_block *sb,
2998 ext4_group_t first_not_zeroed);
3000 static inline int ext4_has_metadata_csum(struct super_block *sb)
3002 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb) &&
3003 !EXT4_SB(sb)->s_chksum_driver);
3005 return ext4_has_feature_metadata_csum(sb) &&
3006 (EXT4_SB(sb)->s_chksum_driver != NULL);
3009 static inline int ext4_has_group_desc_csum(struct super_block *sb)
3011 return ext4_has_feature_gdt_csum(sb) || ext4_has_metadata_csum(sb);
3014 #define ext4_read_incompat_64bit_val(es, name) \
3015 (((es)->s_feature_incompat & cpu_to_le32(EXT4_FEATURE_INCOMPAT_64BIT) \
3016 ? (ext4_fsblk_t)le32_to_cpu(es->name##_hi) << 32 : 0) | \
3017 le32_to_cpu(es->name##_lo))
3019 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
3021 return ext4_read_incompat_64bit_val(es, s_blocks_count);
3024 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
3026 return ext4_read_incompat_64bit_val(es, s_r_blocks_count);
3029 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
3031 return ext4_read_incompat_64bit_val(es, s_free_blocks_count);
3034 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
3037 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
3038 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
3041 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
3044 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
3045 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
3048 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
3051 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
3052 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
3055 static inline loff_t ext4_isize(struct super_block *sb,
3056 struct ext4_inode *raw_inode)
3058 if (ext4_has_feature_largedir(sb) ||
3059 S_ISREG(le16_to_cpu(raw_inode->i_mode)))
3060 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
3061 le32_to_cpu(raw_inode->i_size_lo);
3063 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
3066 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
3068 raw_inode->i_size_lo = cpu_to_le32(i_size);
3069 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
3073 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
3076 struct ext4_group_info **grp_info;
3077 long indexv, indexh;
3078 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
3079 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
3080 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
3081 grp_info = sbi_array_rcu_deref(EXT4_SB(sb), s_group_info, indexv);
3082 return grp_info[indexh];
3086 * Reading s_groups_count requires using smp_rmb() afterwards. See
3087 * the locking protocol documented in the comments of ext4_group_add()
3090 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
3092 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
3098 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
3099 ext4_group_t block_group)
3101 return block_group >> sbi->s_log_groups_per_flex;
3104 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
3106 return 1 << sbi->s_log_groups_per_flex;
3109 #define ext4_std_error(sb, errno) \
3112 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
3116 /* Each CPU can accumulate percpu_counter_batch clusters in their local
3117 * counters. So we need to make sure we have free clusters more
3118 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
3120 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
3122 #define EXT4_FREECLUSTERS_WATERMARK 0
3125 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
3126 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
3128 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
3129 !inode_is_locked(inode));
3130 down_write(&EXT4_I(inode)->i_data_sem);
3131 if (newsize > EXT4_I(inode)->i_disksize)
3132 WRITE_ONCE(EXT4_I(inode)->i_disksize, newsize);
3133 up_write(&EXT4_I(inode)->i_data_sem);
3136 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
3137 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
3141 if (newsize > inode->i_size) {
3142 i_size_write(inode, newsize);
3145 if (newsize > EXT4_I(inode)->i_disksize) {
3146 ext4_update_i_disksize(inode, newsize);
3152 int ext4_update_disksize_before_punch(struct inode *inode, loff_t offset,
3155 struct ext4_group_info {
3156 unsigned long bb_state;
3157 #ifdef AGGRESSIVE_CHECK
3158 unsigned long bb_check_counter;
3160 struct rb_root bb_free_root;
3161 ext4_grpblk_t bb_first_free; /* first free block */
3162 ext4_grpblk_t bb_free; /* total free blocks */
3163 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
3164 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
3165 struct list_head bb_prealloc_list;
3169 struct rw_semaphore alloc_sem;
3170 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
3171 * regions, index is order.
3172 * bb_counters[3] = 5 means
3173 * 5 free 8-block regions. */
3176 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
3177 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
3178 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
3179 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
3180 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT \
3181 (1 << EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT)
3182 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT \
3183 (1 << EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT)
3184 #define EXT4_GROUP_INFO_BBITMAP_READ_BIT 4
3186 #define EXT4_MB_GRP_NEED_INIT(grp) \
3187 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
3188 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
3189 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3190 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
3191 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
3193 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
3194 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3195 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
3196 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3197 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
3198 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
3199 #define EXT4_MB_GRP_TEST_AND_SET_READ(grp) \
3200 (test_and_set_bit(EXT4_GROUP_INFO_BBITMAP_READ_BIT, &((grp)->bb_state)))
3202 #define EXT4_MAX_CONTENTION 8
3203 #define EXT4_CONTENTION_THRESHOLD 2
3205 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
3208 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
3212 * Returns true if the filesystem is busy enough that attempts to
3213 * access the block group locks has run into contention.
3215 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
3217 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
3220 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
3222 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
3223 if (spin_trylock(lock))
3225 * We're able to grab the lock right away, so drop the
3226 * lock contention counter.
3228 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
3231 * The lock is busy, so bump the contention counter,
3232 * and then wait on the spin lock.
3234 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
3235 EXT4_MAX_CONTENTION);
3240 static inline void ext4_unlock_group(struct super_block *sb,
3243 spin_unlock(ext4_group_lock_ptr(sb, group));
3247 * Block validity checking
3249 #define ext4_check_indirect_blockref(inode, bh) \
3250 ext4_check_blockref(__func__, __LINE__, inode, \
3251 (__le32 *)(bh)->b_data, \
3252 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3254 #define ext4_ind_check_inode(inode) \
3255 ext4_check_blockref(__func__, __LINE__, inode, \
3256 EXT4_I(inode)->i_data, \
3260 * Inodes and files operations
3264 extern const struct file_operations ext4_dir_operations;
3266 #ifdef CONFIG_UNICODE
3267 extern const struct dentry_operations ext4_dentry_ops;
3271 extern const struct inode_operations ext4_file_inode_operations;
3272 extern const struct file_operations ext4_file_operations;
3273 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
3276 extern int ext4_get_max_inline_size(struct inode *inode);
3277 extern int ext4_find_inline_data_nolock(struct inode *inode);
3278 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
3280 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
3282 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
3283 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
3284 struct inode *inode,
3285 loff_t pos, unsigned len,
3287 struct page **pagep);
3288 extern int ext4_write_inline_data_end(struct inode *inode,
3289 loff_t pos, unsigned len,
3292 extern struct buffer_head *
3293 ext4_journalled_write_inline_data(struct inode *inode,
3296 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
3297 struct inode *inode,
3298 loff_t pos, unsigned len,
3300 struct page **pagep,
3302 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
3303 unsigned len, unsigned copied,
3305 extern int ext4_try_add_inline_entry(handle_t *handle,
3306 struct ext4_filename *fname,
3307 struct inode *dir, struct inode *inode);
3308 extern int ext4_try_create_inline_dir(handle_t *handle,
3309 struct inode *parent,
3310 struct inode *inode);
3311 extern int ext4_read_inline_dir(struct file *filp,
3312 struct dir_context *ctx,
3313 int *has_inline_data);
3314 extern int ext4_inlinedir_to_tree(struct file *dir_file,
3315 struct inode *dir, ext4_lblk_t block,
3316 struct dx_hash_info *hinfo,
3317 __u32 start_hash, __u32 start_minor_hash,
3318 int *has_inline_data);
3319 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
3320 struct ext4_filename *fname,
3321 struct ext4_dir_entry_2 **res_dir,
3322 int *has_inline_data);
3323 extern int ext4_delete_inline_entry(handle_t *handle,
3325 struct ext4_dir_entry_2 *de_del,
3326 struct buffer_head *bh,
3327 int *has_inline_data);
3328 extern bool empty_inline_dir(struct inode *dir, int *has_inline_data);
3329 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
3330 struct ext4_dir_entry_2 **parent_de,
3332 extern int ext4_inline_data_fiemap(struct inode *inode,
3333 struct fiemap_extent_info *fieinfo,
3334 int *has_inline, __u64 start, __u64 len);
3337 extern int ext4_inline_data_iomap(struct inode *inode, struct iomap *iomap);
3339 extern int ext4_inline_data_truncate(struct inode *inode, int *has_inline);
3341 extern int ext4_convert_inline_data(struct inode *inode);
3343 static inline int ext4_has_inline_data(struct inode *inode)
3345 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
3346 EXT4_I(inode)->i_inline_off;
3350 extern const struct inode_operations ext4_dir_inode_operations;
3351 extern const struct inode_operations ext4_special_inode_operations;
3352 extern struct dentry *ext4_get_parent(struct dentry *child);
3353 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
3354 struct ext4_dir_entry_2 *de,
3355 int blocksize, int csum_size,
3356 unsigned int parent_ino, int dotdot_real_len);
3357 extern void ext4_initialize_dirent_tail(struct buffer_head *bh,
3358 unsigned int blocksize);
3359 extern int ext4_handle_dirty_dirblock(handle_t *handle, struct inode *inode,
3360 struct buffer_head *bh);
3361 extern int ext4_ci_compare(const struct inode *parent,
3362 const struct qstr *fname,
3363 const struct qstr *entry, bool quick);
3366 static const unsigned char ext4_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
3367 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
3368 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
3369 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
3370 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
3371 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
3372 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
3373 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
3376 static inline void ext4_set_de_type(struct super_block *sb,
3377 struct ext4_dir_entry_2 *de,
3379 if (ext4_has_feature_filetype(sb))
3380 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
3384 extern int ext4_mpage_readpages(struct inode *inode,
3385 struct readahead_control *rac, struct page *page);
3386 extern int __init ext4_init_post_read_processing(void);
3387 extern void ext4_exit_post_read_processing(void);
3390 extern const struct inode_operations ext4_encrypted_symlink_inode_operations;
3391 extern const struct inode_operations ext4_symlink_inode_operations;
3392 extern const struct inode_operations ext4_fast_symlink_inode_operations;
3395 extern int ext4_register_sysfs(struct super_block *sb);
3396 extern void ext4_unregister_sysfs(struct super_block *sb);
3397 extern int __init ext4_init_sysfs(void);
3398 extern void ext4_exit_sysfs(void);
3400 /* block_validity */
3401 extern void ext4_release_system_zone(struct super_block *sb);
3402 extern int ext4_setup_system_zone(struct super_block *sb);
3403 extern int __init ext4_init_system_zone(void);
3404 extern void ext4_exit_system_zone(void);
3405 extern int ext4_inode_block_valid(struct inode *inode,
3406 ext4_fsblk_t start_blk,
3407 unsigned int count);
3408 extern int ext4_check_blockref(const char *, unsigned int,
3409 struct inode *, __le32 *, unsigned int);
3412 struct ext4_ext_path;
3416 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3419 #define EXT_MAX_BLOCKS 0xffffffff
3421 extern void ext4_ext_tree_init(handle_t *handle, struct inode *inode);
3422 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
3423 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
3424 struct ext4_map_blocks *map, int flags);
3425 extern int ext4_ext_truncate(handle_t *, struct inode *);
3426 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
3428 extern void ext4_ext_init(struct super_block *);
3429 extern void ext4_ext_release(struct super_block *);
3430 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
3432 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
3433 loff_t offset, ssize_t len);
3434 extern int ext4_convert_unwritten_io_end_vec(handle_t *handle,
3435 ext4_io_end_t *io_end);
3436 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
3437 struct ext4_map_blocks *map, int flags);
3438 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
3440 struct ext4_ext_path *path);
3441 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
3442 struct ext4_ext_path **,
3443 struct ext4_extent *, int);
3444 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
3445 struct ext4_ext_path **,
3447 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
3448 extern int ext4_ext_check_inode(struct inode *inode);
3449 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
3450 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
3451 __u64 start, __u64 len);
3452 extern int ext4_get_es_cache(struct inode *inode,
3453 struct fiemap_extent_info *fieinfo,
3454 __u64 start, __u64 len);
3455 extern int ext4_ext_precache(struct inode *inode);
3456 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
3457 struct inode *inode2, ext4_lblk_t lblk1,
3458 ext4_lblk_t lblk2, ext4_lblk_t count,
3459 int mark_unwritten,int *err);
3460 extern int ext4_clu_mapped(struct inode *inode, ext4_lblk_t lclu);
3461 extern int ext4_datasem_ensure_credits(handle_t *handle, struct inode *inode,
3462 int check_cred, int restart_cred,
3467 extern void ext4_double_down_write_data_sem(struct inode *first,
3468 struct inode *second);
3469 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
3470 struct inode *donor_inode);
3471 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
3472 __u64 start_orig, __u64 start_donor,
3473 __u64 len, __u64 *moved_len);
3476 extern int __init ext4_init_pageio(void);
3477 extern void ext4_exit_pageio(void);
3478 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
3479 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
3480 extern int ext4_put_io_end(ext4_io_end_t *io_end);
3481 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
3482 extern void ext4_io_submit_init(struct ext4_io_submit *io,
3483 struct writeback_control *wbc);
3484 extern void ext4_end_io_rsv_work(struct work_struct *work);
3485 extern void ext4_io_submit(struct ext4_io_submit *io);
3486 extern int ext4_bio_write_page(struct ext4_io_submit *io,
3489 struct writeback_control *wbc,
3491 extern struct ext4_io_end_vec *ext4_alloc_io_end_vec(ext4_io_end_t *io_end);
3492 extern struct ext4_io_end_vec *ext4_last_io_end_vec(ext4_io_end_t *io_end);
3495 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
3498 extern const struct fsverity_operations ext4_verityops;
3501 * Add new method to test whether block and inode bitmaps are properly
3502 * initialized. With uninit_bg reading the block from disk is not enough
3503 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3505 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3507 static inline int bitmap_uptodate(struct buffer_head *bh)
3509 return (buffer_uptodate(bh) &&
3510 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
3512 static inline void set_bitmap_uptodate(struct buffer_head *bh)
3514 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
3517 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3519 /* For ioend & aio unwritten conversion wait queues */
3520 #define EXT4_WQ_HASH_SZ 37
3521 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3523 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
3525 extern int ext4_resize_begin(struct super_block *sb);
3526 extern void ext4_resize_end(struct super_block *sb);
3528 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
3529 struct ext4_io_end *io_end)
3531 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
3532 io_end->flag |= EXT4_IO_END_UNWRITTEN;
3533 atomic_inc(&EXT4_I(inode)->i_unwritten);
3537 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
3539 struct inode *inode = io_end->inode;
3541 if (io_end->flag & EXT4_IO_END_UNWRITTEN) {
3542 io_end->flag &= ~EXT4_IO_END_UNWRITTEN;
3543 /* Wake up anyone waiting on unwritten extent conversion */
3544 if (atomic_dec_and_test(&EXT4_I(inode)->i_unwritten))
3545 wake_up_all(ext4_ioend_wq(inode));
3549 extern const struct iomap_ops ext4_iomap_ops;
3550 extern const struct iomap_ops ext4_iomap_overwrite_ops;
3551 extern const struct iomap_ops ext4_iomap_report_ops;
3553 static inline int ext4_buffer_uptodate(struct buffer_head *bh)
3556 * If the buffer has the write error flag, we have failed
3557 * to write out data in the block. In this case, we don't
3558 * have to read the block because we may read the old data
3561 if (!buffer_uptodate(bh) && buffer_write_io_error(bh))
3562 set_buffer_uptodate(bh);
3563 return buffer_uptodate(bh);
3566 #endif /* __KERNEL__ */
3568 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3569 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3571 #endif /* _EXT4_H */