4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/include/linux/minix_fs.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/version.h>
30 #include <linux/wait.h>
31 #include <linux/blockgroup_lock.h>
32 #include <linux/percpu_counter.h>
33 #include <linux/ratelimit.h>
34 #include <crypto/hash.h>
35 #include <linux/falloc.h>
36 #include <linux/percpu-rwsem.h>
38 #include <linux/compat.h>
42 * The fourth extended filesystem constants/structures
46 * with AGGRESSIVE_CHECK allocator runs consistency checks over
47 * structures. these checks slow things down a lot
49 #define AGGRESSIVE_CHECK__
52 * with DOUBLE_CHECK defined mballoc creates persistent in-core
53 * bitmaps, maintains and uses them to check for double allocations
55 #define DOUBLE_CHECK__
58 * Define EXT4FS_DEBUG to produce debug messages
66 #define ext4_debug(f, a...) \
68 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
69 __FILE__, __LINE__, __func__); \
70 printk(KERN_DEBUG f, ## a); \
73 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
77 * Turn on EXT_DEBUG to get lots of info about extents operations.
81 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
83 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
86 /* data type for block offset of block group */
87 typedef int ext4_grpblk_t
;
89 /* data type for filesystem-wide blocks number */
90 typedef unsigned long long ext4_fsblk_t
;
92 /* data type for file logical block number */
93 typedef __u32 ext4_lblk_t
;
95 /* data type for block group number */
96 typedef unsigned int ext4_group_t
;
98 enum SHIFT_DIRECTION
{
104 * Flags used in mballoc's allocation_context flags field.
106 * Also used to show what's going on for debugging purposes when the
107 * flag field is exported via the traceport interface
110 /* prefer goal again. length */
111 #define EXT4_MB_HINT_MERGE 0x0001
112 /* blocks already reserved */
113 #define EXT4_MB_HINT_RESERVED 0x0002
114 /* metadata is being allocated */
115 #define EXT4_MB_HINT_METADATA 0x0004
116 /* first blocks in the file */
117 #define EXT4_MB_HINT_FIRST 0x0008
118 /* search for the best chunk */
119 #define EXT4_MB_HINT_BEST 0x0010
120 /* data is being allocated */
121 #define EXT4_MB_HINT_DATA 0x0020
122 /* don't preallocate (for tails) */
123 #define EXT4_MB_HINT_NOPREALLOC 0x0040
124 /* allocate for locality group */
125 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
126 /* allocate goal blocks or none */
127 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
128 /* goal is meaningful */
129 #define EXT4_MB_HINT_TRY_GOAL 0x0200
130 /* blocks already pre-reserved by delayed allocation */
131 #define EXT4_MB_DELALLOC_RESERVED 0x0400
132 /* We are doing stream allocation */
133 #define EXT4_MB_STREAM_ALLOC 0x0800
134 /* Use reserved root blocks if needed */
135 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
136 /* Use blocks from reserved pool */
137 #define EXT4_MB_USE_RESERVED 0x2000
139 struct ext4_allocation_request
{
140 /* target inode for block we're allocating */
142 /* how many blocks we want to allocate */
144 /* logical block in target inode */
146 /* the closest logical allocated block to the left */
148 /* the closest logical allocated block to the right */
150 /* phys. target (a hint) */
152 /* phys. block for the closest logical allocated block to the left */
154 /* phys. block for the closest logical allocated block to the right */
156 /* flags. see above EXT4_MB_HINT_* */
161 * Logical to physical block mapping, used by ext4_map_blocks()
163 * This structure is used to pass requests into ext4_map_blocks() as
164 * well as to store the information returned by ext4_map_blocks(). It
165 * takes less room on the stack than a struct buffer_head.
167 #define EXT4_MAP_NEW (1 << BH_New)
168 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
169 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
170 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
171 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
172 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
174 struct ext4_map_blocks
{
178 unsigned int m_flags
;
182 * Flags for ext4_io_end->flags
184 #define EXT4_IO_END_UNWRITTEN 0x0001
187 * For converting unwritten extents on a work queue. 'handle' is used for
188 * buffered writeback.
190 typedef struct ext4_io_end
{
191 struct list_head list
; /* per-file finished IO list */
192 handle_t
*handle
; /* handle reserved for extent
194 struct inode
*inode
; /* file being written to */
195 struct bio
*bio
; /* Linked list of completed
196 * bios covering the extent */
197 unsigned int flag
; /* unwritten or not */
198 atomic_t count
; /* reference counter */
199 loff_t offset
; /* offset in the file */
200 ssize_t size
; /* size of the extent */
203 struct ext4_io_submit
{
204 struct writeback_control
*io_wbc
;
206 ext4_io_end_t
*io_end
;
207 sector_t io_next_block
;
211 * Special inodes numbers
213 #define EXT4_BAD_INO 1 /* Bad blocks inode */
214 #define EXT4_ROOT_INO 2 /* Root inode */
215 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
216 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
217 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
218 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
219 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
220 #define EXT4_JOURNAL_INO 8 /* Journal inode */
222 /* First non-reserved inode for old ext4 filesystems */
223 #define EXT4_GOOD_OLD_FIRST_INO 11
226 * Maximal count of links to a file
228 #define EXT4_LINK_MAX 65000
231 * Macro-instructions used to manage several block sizes
233 #define EXT4_MIN_BLOCK_SIZE 1024
234 #define EXT4_MAX_BLOCK_SIZE 65536
235 #define EXT4_MIN_BLOCK_LOG_SIZE 10
236 #define EXT4_MAX_BLOCK_LOG_SIZE 16
238 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
240 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
242 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
243 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
244 EXT4_SB(s)->s_cluster_bits)
246 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
247 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
249 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
252 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
253 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
254 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
256 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
257 EXT4_GOOD_OLD_INODE_SIZE : \
259 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
260 EXT4_GOOD_OLD_FIRST_INO : \
263 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
265 /* Translate a block number to a cluster number */
266 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
267 /* Translate a cluster number to a block number */
268 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
269 /* Translate # of blks to # of clusters */
270 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
271 (sbi)->s_cluster_bits)
272 /* Mask out the low bits to get the starting block of the cluster */
273 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
274 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
275 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
276 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
277 /* Get the cluster offset */
278 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
279 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
280 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
281 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
284 * Structure of a blocks group descriptor
286 struct ext4_group_desc
288 __le32 bg_block_bitmap_lo
; /* Blocks bitmap block */
289 __le32 bg_inode_bitmap_lo
; /* Inodes bitmap block */
290 __le32 bg_inode_table_lo
; /* Inodes table block */
291 __le16 bg_free_blocks_count_lo
;/* Free blocks count */
292 __le16 bg_free_inodes_count_lo
;/* Free inodes count */
293 __le16 bg_used_dirs_count_lo
; /* Directories count */
294 __le16 bg_flags
; /* EXT4_BG_flags (INODE_UNINIT, etc) */
295 __le32 bg_exclude_bitmap_lo
; /* Exclude bitmap for snapshots */
296 __le16 bg_block_bitmap_csum_lo
;/* crc32c(s_uuid+grp_num+bbitmap) LE */
297 __le16 bg_inode_bitmap_csum_lo
;/* crc32c(s_uuid+grp_num+ibitmap) LE */
298 __le16 bg_itable_unused_lo
; /* Unused inodes count */
299 __le16 bg_checksum
; /* crc16(sb_uuid+group+desc) */
300 __le32 bg_block_bitmap_hi
; /* Blocks bitmap block MSB */
301 __le32 bg_inode_bitmap_hi
; /* Inodes bitmap block MSB */
302 __le32 bg_inode_table_hi
; /* Inodes table block MSB */
303 __le16 bg_free_blocks_count_hi
;/* Free blocks count MSB */
304 __le16 bg_free_inodes_count_hi
;/* Free inodes count MSB */
305 __le16 bg_used_dirs_count_hi
; /* Directories count MSB */
306 __le16 bg_itable_unused_hi
; /* Unused inodes count MSB */
307 __le32 bg_exclude_bitmap_hi
; /* Exclude bitmap block MSB */
308 __le16 bg_block_bitmap_csum_hi
;/* crc32c(s_uuid+grp_num+bbitmap) BE */
309 __le16 bg_inode_bitmap_csum_hi
;/* crc32c(s_uuid+grp_num+ibitmap) BE */
313 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
314 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
316 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
317 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
321 * Structure of a flex block group info
325 atomic64_t free_clusters
;
326 atomic_t free_inodes
;
330 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
331 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
332 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
335 * Macro-instructions used to manage group descriptors
337 #define EXT4_MIN_DESC_SIZE 32
338 #define EXT4_MIN_DESC_SIZE_64BIT 64
339 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
340 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
342 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
343 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
344 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
345 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
346 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
348 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
349 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
350 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
354 * Constants relative to the data blocks
356 #define EXT4_NDIR_BLOCKS 12
357 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
358 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
359 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
360 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
365 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
366 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
367 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
368 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
369 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
370 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
371 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
372 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
373 /* Reserved for compression usage... */
374 #define EXT4_DIRTY_FL 0x00000100
375 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
376 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
377 /* nb: was previously EXT2_ECOMPR_FL */
378 #define EXT4_ENCRYPT_FL 0x00000800 /* encrypted file */
379 /* End compression flags --- maybe not all used */
380 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
381 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
382 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
383 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
384 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
385 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
386 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
387 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
388 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
389 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
390 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
391 #define EXT4_PROJINHERIT_FL 0x20000000 /* Create with parents projid */
392 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
394 #define EXT4_FL_USER_VISIBLE 0x304BDFFF /* User visible flags */
395 #define EXT4_FL_USER_MODIFIABLE 0x204380FF /* User modifiable flags */
397 #define EXT4_FL_XFLAG_VISIBLE (EXT4_SYNC_FL | \
398 EXT4_IMMUTABLE_FL | \
404 /* Flags that should be inherited by new inodes from their parent. */
405 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
406 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
407 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
408 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL |\
411 /* Flags that are appropriate for regular files (all but dir-specific ones). */
412 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
414 /* Flags that are appropriate for non-directories/regular files. */
415 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
417 /* Mask out flags that are inappropriate for the given type of inode. */
418 static inline __u32
ext4_mask_flags(umode_t mode
, __u32 flags
)
422 else if (S_ISREG(mode
))
423 return flags
& EXT4_REG_FLMASK
;
425 return flags
& EXT4_OTHER_FLMASK
;
429 * Inode flags used for atomic set/get
432 EXT4_INODE_SECRM
= 0, /* Secure deletion */
433 EXT4_INODE_UNRM
= 1, /* Undelete */
434 EXT4_INODE_COMPR
= 2, /* Compress file */
435 EXT4_INODE_SYNC
= 3, /* Synchronous updates */
436 EXT4_INODE_IMMUTABLE
= 4, /* Immutable file */
437 EXT4_INODE_APPEND
= 5, /* writes to file may only append */
438 EXT4_INODE_NODUMP
= 6, /* do not dump file */
439 EXT4_INODE_NOATIME
= 7, /* do not update atime */
440 /* Reserved for compression usage... */
441 EXT4_INODE_DIRTY
= 8,
442 EXT4_INODE_COMPRBLK
= 9, /* One or more compressed clusters */
443 EXT4_INODE_NOCOMPR
= 10, /* Don't compress */
444 EXT4_INODE_ENCRYPT
= 11, /* Encrypted file */
445 /* End compression flags --- maybe not all used */
446 EXT4_INODE_INDEX
= 12, /* hash-indexed directory */
447 EXT4_INODE_IMAGIC
= 13, /* AFS directory */
448 EXT4_INODE_JOURNAL_DATA
= 14, /* file data should be journaled */
449 EXT4_INODE_NOTAIL
= 15, /* file tail should not be merged */
450 EXT4_INODE_DIRSYNC
= 16, /* dirsync behaviour (directories only) */
451 EXT4_INODE_TOPDIR
= 17, /* Top of directory hierarchies*/
452 EXT4_INODE_HUGE_FILE
= 18, /* Set to each huge file */
453 EXT4_INODE_EXTENTS
= 19, /* Inode uses extents */
454 EXT4_INODE_EA_INODE
= 21, /* Inode used for large EA */
455 EXT4_INODE_EOFBLOCKS
= 22, /* Blocks allocated beyond EOF */
456 EXT4_INODE_INLINE_DATA
= 28, /* Data in inode. */
457 EXT4_INODE_PROJINHERIT
= 29, /* Create with parents projid */
458 EXT4_INODE_RESERVED
= 31, /* reserved for ext4 lib */
462 * Since it's pretty easy to mix up bit numbers and hex values, we use a
463 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
464 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
465 * any extra space in the compiled kernel image, otherwise, the build will fail.
466 * It's important that these values are the same, since we are using
467 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
468 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
469 * values found in ext2, ext3 and ext4 filesystems, and of course the values
470 * defined in e2fsprogs.
472 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
474 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
475 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
477 static inline void ext4_check_flag_values(void)
479 CHECK_FLAG_VALUE(SECRM
);
480 CHECK_FLAG_VALUE(UNRM
);
481 CHECK_FLAG_VALUE(COMPR
);
482 CHECK_FLAG_VALUE(SYNC
);
483 CHECK_FLAG_VALUE(IMMUTABLE
);
484 CHECK_FLAG_VALUE(APPEND
);
485 CHECK_FLAG_VALUE(NODUMP
);
486 CHECK_FLAG_VALUE(NOATIME
);
487 CHECK_FLAG_VALUE(DIRTY
);
488 CHECK_FLAG_VALUE(COMPRBLK
);
489 CHECK_FLAG_VALUE(NOCOMPR
);
490 CHECK_FLAG_VALUE(ENCRYPT
);
491 CHECK_FLAG_VALUE(INDEX
);
492 CHECK_FLAG_VALUE(IMAGIC
);
493 CHECK_FLAG_VALUE(JOURNAL_DATA
);
494 CHECK_FLAG_VALUE(NOTAIL
);
495 CHECK_FLAG_VALUE(DIRSYNC
);
496 CHECK_FLAG_VALUE(TOPDIR
);
497 CHECK_FLAG_VALUE(HUGE_FILE
);
498 CHECK_FLAG_VALUE(EXTENTS
);
499 CHECK_FLAG_VALUE(EA_INODE
);
500 CHECK_FLAG_VALUE(EOFBLOCKS
);
501 CHECK_FLAG_VALUE(INLINE_DATA
);
502 CHECK_FLAG_VALUE(PROJINHERIT
);
503 CHECK_FLAG_VALUE(RESERVED
);
506 /* Used to pass group descriptor data when online resize is done */
507 struct ext4_new_group_input
{
508 __u32 group
; /* Group number for this data */
509 __u64 block_bitmap
; /* Absolute block number of block bitmap */
510 __u64 inode_bitmap
; /* Absolute block number of inode bitmap */
511 __u64 inode_table
; /* Absolute block number of inode table start */
512 __u32 blocks_count
; /* Total number of blocks in this group */
513 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
517 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
518 struct compat_ext4_new_group_input
{
520 compat_u64 block_bitmap
;
521 compat_u64 inode_bitmap
;
522 compat_u64 inode_table
;
529 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
530 struct ext4_new_group_data
{
536 __u16 reserved_blocks
;
538 __u32 free_blocks_count
;
541 /* Indexes used to index group tables in ext4_new_group_data */
543 BLOCK_BITMAP
= 0, /* block bitmap */
544 INODE_BITMAP
, /* inode bitmap */
545 INODE_TABLE
, /* inode tables */
550 * Flags used by ext4_map_blocks()
552 /* Allocate any needed blocks and/or convert an unwritten
553 extent to be an initialized ext4 */
554 #define EXT4_GET_BLOCKS_CREATE 0x0001
555 /* Request the creation of an unwritten extent */
556 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
557 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
558 EXT4_GET_BLOCKS_CREATE)
559 /* Caller is from the delayed allocation writeout path
560 * finally doing the actual allocation of delayed blocks */
561 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
562 /* caller is from the direct IO path, request to creation of an
563 unwritten extents if not allocated, split the unwritten
564 extent if blocks has been preallocated already*/
565 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
566 #define EXT4_GET_BLOCKS_CONVERT 0x0010
567 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
568 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
569 /* Convert extent to initialized after IO complete */
570 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
571 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
572 /* Eventual metadata allocation (due to growing extent tree)
573 * should not fail, so try to use reserved blocks for that.*/
574 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
575 /* Don't normalize allocation size (used for fallocate) */
576 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
577 /* Request will not result in inode size update (user for fallocate) */
578 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
579 /* Convert written extents to unwritten */
580 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0100
581 /* Write zeros to newly created written extents */
582 #define EXT4_GET_BLOCKS_ZERO 0x0200
583 #define EXT4_GET_BLOCKS_CREATE_ZERO (EXT4_GET_BLOCKS_CREATE |\
584 EXT4_GET_BLOCKS_ZERO)
585 /* Caller will submit data before dropping transaction handle. This
586 * allows jbd2 to avoid submitting data before commit. */
587 #define EXT4_GET_BLOCKS_IO_SUBMIT 0x0400
590 * The bit position of these flags must not overlap with any of the
591 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
592 * read_extent_tree_block(), ext4_split_extent_at(),
593 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
594 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
595 * caching the extents when reading from the extent tree while a
596 * truncate or punch hole operation is in progress.
598 #define EXT4_EX_NOCACHE 0x40000000
599 #define EXT4_EX_FORCE_CACHE 0x20000000
602 * Flags used by ext4_free_blocks
604 #define EXT4_FREE_BLOCKS_METADATA 0x0001
605 #define EXT4_FREE_BLOCKS_FORGET 0x0002
606 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
607 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
608 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
609 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
611 /* Encryption algorithms */
612 #define EXT4_ENCRYPTION_MODE_INVALID 0
613 #define EXT4_ENCRYPTION_MODE_AES_256_XTS 1
614 #define EXT4_ENCRYPTION_MODE_AES_256_GCM 2
615 #define EXT4_ENCRYPTION_MODE_AES_256_CBC 3
616 #define EXT4_ENCRYPTION_MODE_AES_256_CTS 4
618 #include "ext4_crypto.h"
623 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
624 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
625 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
626 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
627 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
628 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
629 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
630 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
631 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
632 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
633 #define EXT4_IOC_MIGRATE _IO('f', 9)
634 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
635 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
636 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
637 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
638 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
639 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
640 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
641 #define EXT4_IOC_SET_ENCRYPTION_POLICY _IOR('f', 19, struct ext4_encryption_policy)
642 #define EXT4_IOC_GET_ENCRYPTION_PWSALT _IOW('f', 20, __u8[16])
643 #define EXT4_IOC_GET_ENCRYPTION_POLICY _IOW('f', 21, struct ext4_encryption_policy)
645 #ifndef FS_IOC_FSGETXATTR
646 /* Until the uapi changes get merged for project quota... */
648 #define FS_IOC_FSGETXATTR _IOR('X', 31, struct fsxattr)
649 #define FS_IOC_FSSETXATTR _IOW('X', 32, struct fsxattr)
652 * Structure for FS_IOC_FSGETXATTR and FS_IOC_FSSETXATTR.
655 __u32 fsx_xflags
; /* xflags field value (get/set) */
656 __u32 fsx_extsize
; /* extsize field value (get/set)*/
657 __u32 fsx_nextents
; /* nextents field value (get) */
658 __u32 fsx_projid
; /* project identifier (get/set) */
659 unsigned char fsx_pad
[12];
663 * Flags for the fsx_xflags field
665 #define FS_XFLAG_REALTIME 0x00000001 /* data in realtime volume */
666 #define FS_XFLAG_PREALLOC 0x00000002 /* preallocated file extents */
667 #define FS_XFLAG_IMMUTABLE 0x00000008 /* file cannot be modified */
668 #define FS_XFLAG_APPEND 0x00000010 /* all writes append */
669 #define FS_XFLAG_SYNC 0x00000020 /* all writes synchronous */
670 #define FS_XFLAG_NOATIME 0x00000040 /* do not update access time */
671 #define FS_XFLAG_NODUMP 0x00000080 /* do not include in backups */
672 #define FS_XFLAG_RTINHERIT 0x00000100 /* create with rt bit set */
673 #define FS_XFLAG_PROJINHERIT 0x00000200 /* create with parents projid */
674 #define FS_XFLAG_NOSYMLINKS 0x00000400 /* disallow symlink creation */
675 #define FS_XFLAG_EXTSIZE 0x00000800 /* extent size allocator hint */
676 #define FS_XFLAG_EXTSZINHERIT 0x00001000 /* inherit inode extent size */
677 #define FS_XFLAG_NODEFRAG 0x00002000 /* do not defragment */
678 #define FS_XFLAG_FILESTREAM 0x00004000 /* use filestream allocator */
679 #define FS_XFLAG_HASATTR 0x80000000 /* no DIFLAG for this */
680 #endif /* !defined(FS_IOC_FSGETXATTR) */
682 #define EXT4_IOC_FSGETXATTR FS_IOC_FSGETXATTR
683 #define EXT4_IOC_FSSETXATTR FS_IOC_FSSETXATTR
685 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
687 * ioctl commands in 32 bit emulation
689 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
690 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
691 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
692 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
693 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
694 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
695 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
696 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
697 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
698 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
701 /* Max physical block we can address w/o extents */
702 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
705 * Structure of an inode on the disk
708 __le16 i_mode
; /* File mode */
709 __le16 i_uid
; /* Low 16 bits of Owner Uid */
710 __le32 i_size_lo
; /* Size in bytes */
711 __le32 i_atime
; /* Access time */
712 __le32 i_ctime
; /* Inode Change time */
713 __le32 i_mtime
; /* Modification time */
714 __le32 i_dtime
; /* Deletion Time */
715 __le16 i_gid
; /* Low 16 bits of Group Id */
716 __le16 i_links_count
; /* Links count */
717 __le32 i_blocks_lo
; /* Blocks count */
718 __le32 i_flags
; /* File flags */
724 __u32 h_i_translator
;
729 } osd1
; /* OS dependent 1 */
730 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
731 __le32 i_generation
; /* File version (for NFS) */
732 __le32 i_file_acl_lo
; /* File ACL */
734 __le32 i_obso_faddr
; /* Obsoleted fragment address */
737 __le16 l_i_blocks_high
; /* were l_i_reserved1 */
738 __le16 l_i_file_acl_high
;
739 __le16 l_i_uid_high
; /* these 2 fields */
740 __le16 l_i_gid_high
; /* were reserved2[0] */
741 __le16 l_i_checksum_lo
;/* crc32c(uuid+inum+inode) LE */
745 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
752 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
753 __le16 m_i_file_acl_high
;
754 __u32 m_i_reserved2
[2];
756 } osd2
; /* OS dependent 2 */
757 __le16 i_extra_isize
;
758 __le16 i_checksum_hi
; /* crc32c(uuid+inum+inode) BE */
759 __le32 i_ctime_extra
; /* extra Change time (nsec << 2 | epoch) */
760 __le32 i_mtime_extra
; /* extra Modification time(nsec << 2 | epoch) */
761 __le32 i_atime_extra
; /* extra Access time (nsec << 2 | epoch) */
762 __le32 i_crtime
; /* File Creation time */
763 __le32 i_crtime_extra
; /* extra FileCreationtime (nsec << 2 | epoch) */
764 __le32 i_version_hi
; /* high 32 bits for 64-bit version */
765 __le32 i_projid
; /* Project ID */
769 __u32 reserved
; /* should be zero */
770 __u32 donor_fd
; /* donor file descriptor */
771 __u64 orig_start
; /* logical start offset in block for orig */
772 __u64 donor_start
; /* logical start offset in block for donor */
773 __u64 len
; /* block length to be moved */
774 __u64 moved_len
; /* moved block length */
777 #define EXT4_EPOCH_BITS 2
778 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
779 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
782 * Extended fields will fit into an inode if the filesystem was formatted
783 * with large inodes (-I 256 or larger) and there are not currently any EAs
784 * consuming all of the available space. For new inodes we always reserve
785 * enough space for the kernel's known extended fields, but for inodes
786 * created with an old kernel this might not have been the case. None of
787 * the extended inode fields is critical for correct filesystem operation.
788 * This macro checks if a certain field fits in the inode. Note that
789 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
791 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
792 ((offsetof(typeof(*ext4_inode), field) + \
793 sizeof((ext4_inode)->field)) \
794 <= (EXT4_GOOD_OLD_INODE_SIZE + \
795 (einode)->i_extra_isize)) \
798 * We use an encoding that preserves the times for extra epoch "00":
800 * extra msb of adjust for signed
801 * epoch 32-bit 32-bit tv_sec to
802 * bits time decoded 64-bit tv_sec 64-bit tv_sec valid time range
803 * 0 0 1 -0x80000000..-0x00000001 0x000000000 1901-12-13..1969-12-31
804 * 0 0 0 0x000000000..0x07fffffff 0x000000000 1970-01-01..2038-01-19
805 * 0 1 1 0x080000000..0x0ffffffff 0x100000000 2038-01-19..2106-02-07
806 * 0 1 0 0x100000000..0x17fffffff 0x100000000 2106-02-07..2174-02-25
807 * 1 0 1 0x180000000..0x1ffffffff 0x200000000 2174-02-25..2242-03-16
808 * 1 0 0 0x200000000..0x27fffffff 0x200000000 2242-03-16..2310-04-04
809 * 1 1 1 0x280000000..0x2ffffffff 0x300000000 2310-04-04..2378-04-22
810 * 1 1 0 0x300000000..0x37fffffff 0x300000000 2378-04-22..2446-05-10
812 * Note that previous versions of the kernel on 64-bit systems would
813 * incorrectly use extra epoch bits 1,1 for dates between 1901 and
814 * 1970. e2fsck will correct this, assuming that it is run on the
815 * affected filesystem before 2242.
818 static inline __le32
ext4_encode_extra_time(struct timespec
*time
)
820 u32 extra
= sizeof(time
->tv_sec
) > 4 ?
821 ((time
->tv_sec
- (s32
)time
->tv_sec
) >> 32) & EXT4_EPOCH_MASK
: 0;
822 return cpu_to_le32(extra
| (time
->tv_nsec
<< EXT4_EPOCH_BITS
));
825 static inline void ext4_decode_extra_time(struct timespec
*time
, __le32 extra
)
827 if (unlikely(sizeof(time
->tv_sec
) > 4 &&
828 (extra
& cpu_to_le32(EXT4_EPOCH_MASK
)))) {
829 #if LINUX_VERSION_CODE < KERNEL_VERSION(4,20,0)
830 /* Handle legacy encoding of pre-1970 dates with epoch
831 * bits 1,1. We assume that by kernel version 4.20,
832 * everyone will have run fsck over the affected
833 * filesystems to correct the problem. (This
834 * backwards compatibility may be removed before this
835 * time, at the discretion of the ext4 developers.)
837 u64 extra_bits
= le32_to_cpu(extra
) & EXT4_EPOCH_MASK
;
838 if (extra_bits
== 3 && ((time
->tv_sec
) & 0x80000000) != 0)
840 time
->tv_sec
+= extra_bits
<< 32;
842 time
->tv_sec
+= (u64
)(le32_to_cpu(extra
) & EXT4_EPOCH_MASK
) << 32;
845 time
->tv_nsec
= (le32_to_cpu(extra
) & EXT4_NSEC_MASK
) >> EXT4_EPOCH_BITS
;
848 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
850 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
851 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
852 (raw_inode)->xtime ## _extra = \
853 ext4_encode_extra_time(&(inode)->xtime); \
856 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
858 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
859 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
860 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
861 (raw_inode)->xtime ## _extra = \
862 ext4_encode_extra_time(&(einode)->xtime); \
865 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
867 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
868 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
869 ext4_decode_extra_time(&(inode)->xtime, \
870 raw_inode->xtime ## _extra); \
872 (inode)->xtime.tv_nsec = 0; \
875 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
877 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
878 (einode)->xtime.tv_sec = \
879 (signed)le32_to_cpu((raw_inode)->xtime); \
881 (einode)->xtime.tv_sec = 0; \
882 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
883 ext4_decode_extra_time(&(einode)->xtime, \
884 raw_inode->xtime ## _extra); \
886 (einode)->xtime.tv_nsec = 0; \
889 #define i_disk_version osd1.linux1.l_i_version
891 #if defined(__KERNEL__) || defined(__linux__)
892 #define i_reserved1 osd1.linux1.l_i_reserved1
893 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
894 #define i_blocks_high osd2.linux2.l_i_blocks_high
895 #define i_uid_low i_uid
896 #define i_gid_low i_gid
897 #define i_uid_high osd2.linux2.l_i_uid_high
898 #define i_gid_high osd2.linux2.l_i_gid_high
899 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
901 #elif defined(__GNU__)
903 #define i_translator osd1.hurd1.h_i_translator
904 #define i_uid_high osd2.hurd2.h_i_uid_high
905 #define i_gid_high osd2.hurd2.h_i_gid_high
906 #define i_author osd2.hurd2.h_i_author
908 #elif defined(__masix__)
910 #define i_reserved1 osd1.masix1.m_i_reserved1
911 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
912 #define i_reserved2 osd2.masix2.m_i_reserved2
914 #endif /* defined(__KERNEL__) || defined(__linux__) */
916 #include "extents_status.h"
919 * Lock subclasses for i_data_sem in the ext4_inode_info structure.
921 * These are needed to avoid lockdep false positives when we need to
922 * allocate blocks to the quota inode during ext4_map_blocks(), while
923 * holding i_data_sem for a normal (non-quota) inode. Since we don't
924 * do quota tracking for the quota inode, this avoids deadlock (as
925 * well as infinite recursion, since it isn't turtles all the way
928 * I_DATA_SEM_NORMAL - Used for most inodes
929 * I_DATA_SEM_OTHER - Used by move_inode.c for the second normal inode
930 * where the second inode has larger inode number
932 * I_DATA_SEM_QUOTA - Used for quota inodes only
935 I_DATA_SEM_NORMAL
= 0,
942 * fourth extended file system inode data in memory
944 struct ext4_inode_info
{
945 __le32 i_data
[15]; /* unconverted */
947 ext4_fsblk_t i_file_acl
;
950 * i_block_group is the number of the block group which contains
951 * this file's inode. Constant across the lifetime of the inode,
952 * it is ued for making block allocation decisions - we try to
953 * place a file's data blocks near its inode block, and new inodes
954 * near to their parent directory's inode.
956 ext4_group_t i_block_group
;
957 ext4_lblk_t i_dir_start_lookup
;
958 #if (BITS_PER_LONG < 64)
959 unsigned long i_state_flags
; /* Dynamic state flags */
961 unsigned long i_flags
;
964 * Extended attributes can be read independently of the main file
965 * data. Taking i_mutex even when reading would cause contention
966 * between readers of EAs and writers of regular file data, so
967 * instead we synchronize on xattr_sem when reading or changing
970 struct rw_semaphore xattr_sem
;
972 struct list_head i_orphan
; /* unlinked but open inodes */
975 * i_disksize keeps track of what the inode size is ON DISK, not
976 * in memory. During truncate, i_size is set to the new size by
977 * the VFS prior to calling ext4_truncate(), but the filesystem won't
978 * set i_disksize to 0 until the truncate is actually under way.
980 * The intent is that i_disksize always represents the blocks which
981 * are used by this file. This allows recovery to restart truncate
982 * on orphans if we crash during truncate. We actually write i_disksize
983 * into the on-disk inode when writing inodes out, instead of i_size.
985 * The only time when i_disksize and i_size may be different is when
986 * a truncate is in progress. The only things which change i_disksize
987 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
992 * i_data_sem is for serialising ext4_truncate() against
993 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
994 * data tree are chopped off during truncate. We can't do that in
995 * ext4 because whenever we perform intermediate commits during
996 * truncate, the inode and all the metadata blocks *must* be in a
997 * consistent state which allows truncation of the orphans to restart
998 * during recovery. Hence we must fix the get_block-vs-truncate race
999 * by other means, so we have i_data_sem.
1001 struct rw_semaphore i_data_sem
;
1003 * i_mmap_sem is for serializing page faults with truncate / punch hole
1004 * operations. We have to make sure that new page cannot be faulted in
1005 * a section of the inode that is being punched. We cannot easily use
1006 * i_data_sem for this since we need protection for the whole punch
1007 * operation and i_data_sem ranks below transaction start so we have
1008 * to occasionally drop it.
1010 struct rw_semaphore i_mmap_sem
;
1011 struct inode vfs_inode
;
1012 struct jbd2_inode
*jinode
;
1014 spinlock_t i_raw_lock
; /* protects updates to the raw inode */
1017 * File creation time. Its function is same as that of
1018 * struct timespec i_{a,c,m}time in the generic inode.
1020 struct timespec i_crtime
;
1023 struct list_head i_prealloc_list
;
1024 spinlock_t i_prealloc_lock
;
1026 /* extents status tree */
1027 struct ext4_es_tree i_es_tree
;
1029 struct list_head i_es_list
;
1030 unsigned int i_es_all_nr
; /* protected by i_es_lock */
1031 unsigned int i_es_shk_nr
; /* protected by i_es_lock */
1032 ext4_lblk_t i_es_shrink_lblk
; /* Offset where we start searching for
1033 extents to shrink. Protected by
1037 ext4_group_t i_last_alloc_group
;
1039 /* allocation reservation info for delalloc */
1040 /* In case of bigalloc, these refer to clusters rather than blocks */
1041 unsigned int i_reserved_data_blocks
;
1042 unsigned int i_reserved_meta_blocks
;
1043 unsigned int i_allocated_meta_blocks
;
1044 ext4_lblk_t i_da_metadata_calc_last_lblock
;
1045 int i_da_metadata_calc_len
;
1047 /* on-disk additional length */
1048 __u16 i_extra_isize
;
1050 /* Indicate the inline data space. */
1055 /* quota space reservation, managed internally by quota code */
1056 qsize_t i_reserved_quota
;
1059 /* Lock protecting lists below */
1060 spinlock_t i_completed_io_lock
;
1062 * Completed IOs that need unwritten extents handling and have
1063 * transaction reserved
1065 struct list_head i_rsv_conversion_list
;
1066 struct work_struct i_rsv_conversion_work
;
1067 atomic_t i_unwritten
; /* Nr. of inflight conversions pending */
1069 spinlock_t i_block_reservation_lock
;
1072 * Transactions that contain inode's metadata needed to complete
1073 * fsync and fdatasync, respectively.
1076 tid_t i_datasync_tid
;
1079 struct dquot
*i_dquot
[MAXQUOTAS
];
1082 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
1085 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1086 /* Encryption params */
1087 struct ext4_crypt_info
*i_crypt_info
;
1093 * File system states
1095 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
1096 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
1097 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
1100 * Misc. filesystem flags
1102 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
1103 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
1104 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
1107 * Mount flags set via mount options or defaults
1109 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
1110 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
1111 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
1112 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
1113 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
1114 #define EXT4_MOUNT_ERRORS_MASK 0x00070
1115 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
1116 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
1117 #ifdef CONFIG_FS_DAX
1118 #define EXT4_MOUNT_DAX 0x00200 /* Direct Access */
1120 #define EXT4_MOUNT_DAX 0
1122 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
1123 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
1124 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
1125 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
1126 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
1127 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
1128 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
1129 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
1130 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
1131 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
1132 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
1133 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
1134 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
1135 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
1136 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
1137 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
1138 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
1139 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
1140 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
1141 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
1142 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
1145 * Mount flags set either automatically (could not be set by mount option)
1146 * based on per file system feature or property or in special cases such as
1147 * distinguishing between explicit mount option definition and default.
1149 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
1150 specified delalloc */
1151 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1152 size of blocksize * 8
1154 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1157 #define EXT4_MOUNT2_EXPLICIT_JOURNAL_CHECKSUM 0x00000008 /* User explicitly
1158 specified journal checksum */
1160 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1162 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1164 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1167 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1169 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1171 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1174 #define ext4_test_and_set_bit __test_and_set_bit_le
1175 #define ext4_set_bit __set_bit_le
1176 #define ext4_set_bit_atomic ext2_set_bit_atomic
1177 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1178 #define ext4_clear_bit __clear_bit_le
1179 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1180 #define ext4_test_bit test_bit_le
1181 #define ext4_find_next_zero_bit find_next_zero_bit_le
1182 #define ext4_find_next_bit find_next_bit_le
1184 extern void ext4_set_bits(void *bm
, int cur
, int len
);
1187 * Maximal mount counts between two filesystem checks
1189 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1190 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1193 * Behaviour when detecting errors
1195 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1196 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1197 #define EXT4_ERRORS_PANIC 3 /* Panic */
1198 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1200 /* Metadata checksum algorithm codes */
1201 #define EXT4_CRC32C_CHKSUM 1
1204 * Structure of the super block
1206 struct ext4_super_block
{
1207 /*00*/ __le32 s_inodes_count
; /* Inodes count */
1208 __le32 s_blocks_count_lo
; /* Blocks count */
1209 __le32 s_r_blocks_count_lo
; /* Reserved blocks count */
1210 __le32 s_free_blocks_count_lo
; /* Free blocks count */
1211 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
1212 __le32 s_first_data_block
; /* First Data Block */
1213 __le32 s_log_block_size
; /* Block size */
1214 __le32 s_log_cluster_size
; /* Allocation cluster size */
1215 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
1216 __le32 s_clusters_per_group
; /* # Clusters per group */
1217 __le32 s_inodes_per_group
; /* # Inodes per group */
1218 __le32 s_mtime
; /* Mount time */
1219 /*30*/ __le32 s_wtime
; /* Write time */
1220 __le16 s_mnt_count
; /* Mount count */
1221 __le16 s_max_mnt_count
; /* Maximal mount count */
1222 __le16 s_magic
; /* Magic signature */
1223 __le16 s_state
; /* File system state */
1224 __le16 s_errors
; /* Behaviour when detecting errors */
1225 __le16 s_minor_rev_level
; /* minor revision level */
1226 /*40*/ __le32 s_lastcheck
; /* time of last check */
1227 __le32 s_checkinterval
; /* max. time between checks */
1228 __le32 s_creator_os
; /* OS */
1229 __le32 s_rev_level
; /* Revision level */
1230 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
1231 __le16 s_def_resgid
; /* Default gid for reserved blocks */
1233 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1235 * Note: the difference between the compatible feature set and
1236 * the incompatible feature set is that if there is a bit set
1237 * in the incompatible feature set that the kernel doesn't
1238 * know about, it should refuse to mount the filesystem.
1240 * e2fsck's requirements are more strict; if it doesn't know
1241 * about a feature in either the compatible or incompatible
1242 * feature set, it must abort and not try to meddle with
1243 * things it doesn't understand...
1245 __le32 s_first_ino
; /* First non-reserved inode */
1246 __le16 s_inode_size
; /* size of inode structure */
1247 __le16 s_block_group_nr
; /* block group # of this superblock */
1248 __le32 s_feature_compat
; /* compatible feature set */
1249 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
1250 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
1251 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
1252 /*78*/ char s_volume_name
[16]; /* volume name */
1253 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
1254 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
1256 * Performance hints. Directory preallocation should only
1257 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1259 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
1260 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
1261 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
1263 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1265 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
1266 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
1267 __le32 s_journal_dev
; /* device number of journal file */
1268 __le32 s_last_orphan
; /* start of list of inodes to delete */
1269 __le32 s_hash_seed
[4]; /* HTREE hash seed */
1270 __u8 s_def_hash_version
; /* Default hash version to use */
1271 __u8 s_jnl_backup_type
;
1272 __le16 s_desc_size
; /* size of group descriptor */
1273 /*100*/ __le32 s_default_mount_opts
;
1274 __le32 s_first_meta_bg
; /* First metablock block group */
1275 __le32 s_mkfs_time
; /* When the filesystem was created */
1276 __le32 s_jnl_blocks
[17]; /* Backup of the journal inode */
1277 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1278 /*150*/ __le32 s_blocks_count_hi
; /* Blocks count */
1279 __le32 s_r_blocks_count_hi
; /* Reserved blocks count */
1280 __le32 s_free_blocks_count_hi
; /* Free blocks count */
1281 __le16 s_min_extra_isize
; /* All inodes have at least # bytes */
1282 __le16 s_want_extra_isize
; /* New inodes should reserve # bytes */
1283 __le32 s_flags
; /* Miscellaneous flags */
1284 __le16 s_raid_stride
; /* RAID stride */
1285 __le16 s_mmp_update_interval
; /* # seconds to wait in MMP checking */
1286 __le64 s_mmp_block
; /* Block for multi-mount protection */
1287 __le32 s_raid_stripe_width
; /* blocks on all data disks (N*stride)*/
1288 __u8 s_log_groups_per_flex
; /* FLEX_BG group size */
1289 __u8 s_checksum_type
; /* metadata checksum algorithm used */
1290 __u8 s_encryption_level
; /* versioning level for encryption */
1291 __u8 s_reserved_pad
; /* Padding to next 32bits */
1292 __le64 s_kbytes_written
; /* nr of lifetime kilobytes written */
1293 __le32 s_snapshot_inum
; /* Inode number of active snapshot */
1294 __le32 s_snapshot_id
; /* sequential ID of active snapshot */
1295 __le64 s_snapshot_r_blocks_count
; /* reserved blocks for active
1296 snapshot's future use */
1297 __le32 s_snapshot_list
; /* inode number of the head of the
1298 on-disk snapshot list */
1299 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1300 __le32 s_error_count
; /* number of fs errors */
1301 __le32 s_first_error_time
; /* first time an error happened */
1302 __le32 s_first_error_ino
; /* inode involved in first error */
1303 __le64 s_first_error_block
; /* block involved of first error */
1304 __u8 s_first_error_func
[32]; /* function where the error happened */
1305 __le32 s_first_error_line
; /* line number where error happened */
1306 __le32 s_last_error_time
; /* most recent time of an error */
1307 __le32 s_last_error_ino
; /* inode involved in last error */
1308 __le32 s_last_error_line
; /* line number where error happened */
1309 __le64 s_last_error_block
; /* block involved of last error */
1310 __u8 s_last_error_func
[32]; /* function where the error happened */
1311 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1312 __u8 s_mount_opts
[64];
1313 __le32 s_usr_quota_inum
; /* inode for tracking user quota */
1314 __le32 s_grp_quota_inum
; /* inode for tracking group quota */
1315 __le32 s_overhead_clusters
; /* overhead blocks/clusters in fs */
1316 __le32 s_backup_bgs
[2]; /* groups with sparse_super2 SBs */
1317 __u8 s_encrypt_algos
[4]; /* Encryption algorithms in use */
1318 __u8 s_encrypt_pw_salt
[16]; /* Salt used for string2key algorithm */
1319 __le32 s_lpf_ino
; /* Location of the lost+found inode */
1320 __le32 s_prj_quota_inum
; /* inode for tracking project quota */
1321 __le32 s_checksum_seed
; /* crc32c(uuid) if csum_seed set */
1322 __le32 s_reserved
[98]; /* Padding to the end of the block */
1323 __le32 s_checksum
; /* crc32c(superblock) */
1326 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1331 * run-time mount flags
1333 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1334 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1335 #define EXT4_MF_TEST_DUMMY_ENCRYPTION 0x0004
1337 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1338 #define DUMMY_ENCRYPTION_ENABLED(sbi) (unlikely((sbi)->s_mount_flags & \
1339 EXT4_MF_TEST_DUMMY_ENCRYPTION))
1341 #define DUMMY_ENCRYPTION_ENABLED(sbi) (0)
1344 /* Number of quota types we support */
1345 #define EXT4_MAXQUOTAS 3
1348 * fourth extended-fs super-block data in memory
1350 struct ext4_sb_info
{
1351 unsigned long s_desc_size
; /* Size of a group descriptor in bytes */
1352 unsigned long s_inodes_per_block
;/* Number of inodes per block */
1353 unsigned long s_blocks_per_group
;/* Number of blocks in a group */
1354 unsigned long s_clusters_per_group
; /* Number of clusters in a group */
1355 unsigned long s_inodes_per_group
;/* Number of inodes in a group */
1356 unsigned long s_itb_per_group
; /* Number of inode table blocks per group */
1357 unsigned long s_gdb_count
; /* Number of group descriptor blocks */
1358 unsigned long s_desc_per_block
; /* Number of group descriptors per block */
1359 ext4_group_t s_groups_count
; /* Number of groups in the fs */
1360 ext4_group_t s_blockfile_groups
;/* Groups acceptable for non-extent files */
1361 unsigned long s_overhead
; /* # of fs overhead clusters */
1362 unsigned int s_cluster_ratio
; /* Number of blocks per cluster */
1363 unsigned int s_cluster_bits
; /* log2 of s_cluster_ratio */
1364 loff_t s_bitmap_maxbytes
; /* max bytes for bitmap files */
1365 struct buffer_head
* s_sbh
; /* Buffer containing the super block */
1366 struct ext4_super_block
*s_es
; /* Pointer to the super block in the buffer */
1367 struct buffer_head
**s_group_desc
;
1368 unsigned int s_mount_opt
;
1369 unsigned int s_mount_opt2
;
1370 unsigned int s_mount_flags
;
1371 unsigned int s_def_mount_opt
;
1372 ext4_fsblk_t s_sb_block
;
1373 atomic64_t s_resv_clusters
;
1376 unsigned short s_mount_state
;
1377 unsigned short s_pad
;
1378 int s_addr_per_block_bits
;
1379 int s_desc_per_block_bits
;
1382 unsigned int s_inode_readahead_blks
;
1383 unsigned int s_inode_goal
;
1384 spinlock_t s_next_gen_lock
;
1385 u32 s_next_generation
;
1387 int s_def_hash_version
;
1388 int s_hash_unsigned
; /* 3 if hash should be signed, 0 if not */
1389 struct percpu_counter s_freeclusters_counter
;
1390 struct percpu_counter s_freeinodes_counter
;
1391 struct percpu_counter s_dirs_counter
;
1392 struct percpu_counter s_dirtyclusters_counter
;
1393 struct blockgroup_lock
*s_blockgroup_lock
;
1394 struct proc_dir_entry
*s_proc
;
1395 struct kobject s_kobj
;
1396 struct completion s_kobj_unregister
;
1397 struct super_block
*s_sb
;
1400 struct journal_s
*s_journal
;
1401 struct list_head s_orphan
;
1402 struct mutex s_orphan_lock
;
1403 unsigned long s_resize_flags
; /* Flags indicating if there
1405 unsigned long s_commit_interval
;
1406 u32 s_max_batch_time
;
1407 u32 s_min_batch_time
;
1408 struct block_device
*journal_bdev
;
1410 char *s_qf_names
[EXT4_MAXQUOTAS
]; /* Names of quota files with journalled quota */
1411 int s_jquota_fmt
; /* Format of quota to use */
1413 unsigned int s_want_extra_isize
; /* New inodes should reserve # bytes */
1414 struct rb_root system_blks
;
1416 #ifdef EXTENTS_STATS
1417 /* ext4 extents stats */
1418 unsigned long s_ext_min
;
1419 unsigned long s_ext_max
;
1420 unsigned long s_depth_max
;
1421 spinlock_t s_ext_stats_lock
;
1422 unsigned long s_ext_blocks
;
1423 unsigned long s_ext_extents
;
1426 /* for buddy allocator */
1427 struct ext4_group_info
***s_group_info
;
1428 struct inode
*s_buddy_cache
;
1429 spinlock_t s_md_lock
;
1430 unsigned short *s_mb_offsets
;
1431 unsigned int *s_mb_maxs
;
1432 unsigned int s_group_info_size
;
1435 unsigned long s_stripe
;
1436 unsigned int s_mb_stream_request
;
1437 unsigned int s_mb_max_to_scan
;
1438 unsigned int s_mb_min_to_scan
;
1439 unsigned int s_mb_stats
;
1440 unsigned int s_mb_order2_reqs
;
1441 unsigned int s_mb_group_prealloc
;
1442 unsigned int s_max_dir_size_kb
;
1443 /* where last allocation was done - for stream allocation */
1444 unsigned long s_mb_last_group
;
1445 unsigned long s_mb_last_start
;
1447 /* stats for buddy allocator */
1448 atomic_t s_bal_reqs
; /* number of reqs with len > 1 */
1449 atomic_t s_bal_success
; /* we found long enough chunks */
1450 atomic_t s_bal_allocated
; /* in blocks */
1451 atomic_t s_bal_ex_scanned
; /* total extents scanned */
1452 atomic_t s_bal_goals
; /* goal hits */
1453 atomic_t s_bal_breaks
; /* too long searches */
1454 atomic_t s_bal_2orders
; /* 2^order hits */
1455 spinlock_t s_bal_lock
;
1456 unsigned long s_mb_buddies_generated
;
1457 unsigned long long s_mb_generation_time
;
1458 atomic_t s_mb_lost_chunks
;
1459 atomic_t s_mb_preallocated
;
1460 atomic_t s_mb_discarded
;
1461 atomic_t s_lock_busy
;
1463 /* locality groups */
1464 struct ext4_locality_group __percpu
*s_locality_groups
;
1466 /* for write statistics */
1467 unsigned long s_sectors_written_start
;
1468 u64 s_kbytes_written
;
1470 /* the size of zero-out chunk */
1471 unsigned int s_extent_max_zeroout_kb
;
1473 unsigned int s_log_groups_per_flex
;
1474 struct flex_groups
*s_flex_groups
;
1475 ext4_group_t s_flex_groups_allocated
;
1477 /* workqueue for reserved extent conversions (buffered io) */
1478 struct workqueue_struct
*rsv_conversion_wq
;
1480 /* timer for periodic error stats printing */
1481 struct timer_list s_err_report
;
1483 /* Lazy inode table initialization info */
1484 struct ext4_li_request
*s_li_request
;
1485 /* Wait multiplier for lazy initialization thread */
1486 unsigned int s_li_wait_mult
;
1488 /* Kernel thread for multiple mount protection */
1489 struct task_struct
*s_mmp_tsk
;
1491 /* record the last minlen when FITRIM is called. */
1492 atomic_t s_last_trim_minblks
;
1494 /* Reference to checksum algorithm driver via cryptoapi */
1495 struct crypto_shash
*s_chksum_driver
;
1497 /* Precomputed FS UUID checksum for seeding other checksums */
1500 /* Reclaim extents from extent status tree */
1501 struct shrinker s_es_shrinker
;
1502 struct list_head s_es_list
; /* List of inodes with reclaimable extents */
1504 struct ext4_es_stats s_es_stats
;
1505 struct mb_cache
*s_mb_cache
;
1506 spinlock_t s_es_lock ____cacheline_aligned_in_smp
;
1508 /* Ratelimit ext4 messages. */
1509 struct ratelimit_state s_err_ratelimit_state
;
1510 struct ratelimit_state s_warning_ratelimit_state
;
1511 struct ratelimit_state s_msg_ratelimit_state
;
1513 /* Barrier between changing inodes' journal flags and writepages ops. */
1514 struct percpu_rw_semaphore s_journal_flag_rwsem
;
1517 static inline struct ext4_sb_info
*EXT4_SB(struct super_block
*sb
)
1519 return sb
->s_fs_info
;
1521 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
1523 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
1526 static inline struct timespec
ext4_current_time(struct inode
*inode
)
1528 return (inode
->i_sb
->s_time_gran
< NSEC_PER_SEC
) ?
1529 current_fs_time(inode
->i_sb
) : CURRENT_TIME_SEC
;
1532 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
1534 return ino
== EXT4_ROOT_INO
||
1535 ino
== EXT4_USR_QUOTA_INO
||
1536 ino
== EXT4_GRP_QUOTA_INO
||
1537 ino
== EXT4_BOOT_LOADER_INO
||
1538 ino
== EXT4_JOURNAL_INO
||
1539 ino
== EXT4_RESIZE_INO
||
1540 (ino
>= EXT4_FIRST_INO(sb
) &&
1541 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
1545 * Inode dynamic state flags
1548 EXT4_STATE_JDATA
, /* journaled data exists */
1549 EXT4_STATE_NEW
, /* inode is newly created */
1550 EXT4_STATE_XATTR
, /* has in-inode xattrs */
1551 EXT4_STATE_NO_EXPAND
, /* No space for expansion */
1552 EXT4_STATE_DA_ALLOC_CLOSE
, /* Alloc DA blks on close */
1553 EXT4_STATE_EXT_MIGRATE
, /* Inode is migrating */
1554 EXT4_STATE_DIO_UNWRITTEN
, /* need convert on dio done*/
1555 EXT4_STATE_NEWENTRY
, /* File just added to dir */
1556 EXT4_STATE_DIOREAD_LOCK
, /* Disable support for dio read
1558 EXT4_STATE_MAY_INLINE_DATA
, /* may have in-inode data */
1559 EXT4_STATE_EXT_PRECACHED
, /* extents have been precached */
1562 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1563 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1565 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1567 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1569 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1571 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1573 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1576 /* Add these declarations here only so that these functions can be
1577 * found by name. Otherwise, they are very hard to locate. */
1578 static inline int ext4_test_inode_flag(struct inode
*inode
, int bit
);
1579 static inline void ext4_set_inode_flag(struct inode
*inode
, int bit
);
1580 static inline void ext4_clear_inode_flag(struct inode
*inode
, int bit
);
1581 EXT4_INODE_BIT_FNS(flag
, flags
, 0)
1583 /* Add these declarations here only so that these functions can be
1584 * found by name. Otherwise, they are very hard to locate. */
1585 static inline int ext4_test_inode_state(struct inode
*inode
, int bit
);
1586 static inline void ext4_set_inode_state(struct inode
*inode
, int bit
);
1587 static inline void ext4_clear_inode_state(struct inode
*inode
, int bit
);
1588 #if (BITS_PER_LONG < 64)
1589 EXT4_INODE_BIT_FNS(state
, state_flags
, 0)
1591 static inline void ext4_clear_state_flags(struct ext4_inode_info
*ei
)
1593 (ei
)->i_state_flags
= 0;
1596 EXT4_INODE_BIT_FNS(state
, flags
, 32)
1598 static inline void ext4_clear_state_flags(struct ext4_inode_info
*ei
)
1600 /* We depend on the fact that callers will set i_flags */
1604 /* Assume that user mode programs are passing in an ext4fs superblock, not
1605 * a kernel struct super_block. This will allow us to call the feature-test
1606 * macros from user land. */
1607 #define EXT4_SB(sb) (sb)
1611 * Returns true if the inode is inode is encrypted
1613 static inline int ext4_encrypted_inode(struct inode
*inode
)
1615 #ifdef CONFIG_EXT4_FS_ENCRYPTION
1616 return ext4_test_inode_flag(inode
, EXT4_INODE_ENCRYPT
);
1622 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1625 * Codes for operating systems
1627 #define EXT4_OS_LINUX 0
1628 #define EXT4_OS_HURD 1
1629 #define EXT4_OS_MASIX 2
1630 #define EXT4_OS_FREEBSD 3
1631 #define EXT4_OS_LITES 4
1636 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1637 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1639 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1640 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1642 #define EXT4_GOOD_OLD_INODE_SIZE 128
1645 * Feature set definitions
1648 /* Use the ext4_{has,set,clear}_feature_* helpers; these will be removed */
1649 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1650 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1651 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1652 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1653 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1654 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1655 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1656 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1657 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1658 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1659 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1660 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1661 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1662 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1663 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1664 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1665 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1666 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1668 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1669 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1670 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1671 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1672 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1673 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1674 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1676 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1677 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1678 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1679 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1680 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1681 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1682 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1683 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1684 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1686 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1687 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1688 * all other data structures' checksums. However, the METADATA_CSUM and
1689 * GDT_CSUM bits are mutually exclusive.
1691 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1692 #define EXT4_FEATURE_RO_COMPAT_READONLY 0x1000
1693 #define EXT4_FEATURE_RO_COMPAT_PROJECT 0x2000
1695 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1696 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1697 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1698 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1699 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1700 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1701 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1702 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1703 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1704 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1705 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1706 #define EXT4_FEATURE_INCOMPAT_CSUM_SEED 0x2000
1707 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1708 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1709 #define EXT4_FEATURE_INCOMPAT_ENCRYPT 0x10000
1711 #define EXT4_FEATURE_COMPAT_FUNCS(name, flagname) \
1712 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1714 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1715 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname)) != 0); \
1717 static inline void ext4_set_feature_##name(struct super_block *sb) \
1719 EXT4_SB(sb)->s_es->s_feature_compat |= \
1720 cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1722 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1724 EXT4_SB(sb)->s_es->s_feature_compat &= \
1725 ~cpu_to_le32(EXT4_FEATURE_COMPAT_##flagname); \
1728 #define EXT4_FEATURE_RO_COMPAT_FUNCS(name, flagname) \
1729 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1731 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1732 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname)) != 0); \
1734 static inline void ext4_set_feature_##name(struct super_block *sb) \
1736 EXT4_SB(sb)->s_es->s_feature_ro_compat |= \
1737 cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1739 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1741 EXT4_SB(sb)->s_es->s_feature_ro_compat &= \
1742 ~cpu_to_le32(EXT4_FEATURE_RO_COMPAT_##flagname); \
1745 #define EXT4_FEATURE_INCOMPAT_FUNCS(name, flagname) \
1746 static inline bool ext4_has_feature_##name(struct super_block *sb) \
1748 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1749 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname)) != 0); \
1751 static inline void ext4_set_feature_##name(struct super_block *sb) \
1753 EXT4_SB(sb)->s_es->s_feature_incompat |= \
1754 cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1756 static inline void ext4_clear_feature_##name(struct super_block *sb) \
1758 EXT4_SB(sb)->s_es->s_feature_incompat &= \
1759 ~cpu_to_le32(EXT4_FEATURE_INCOMPAT_##flagname); \
1762 EXT4_FEATURE_COMPAT_FUNCS(dir_prealloc
, DIR_PREALLOC
)
1763 EXT4_FEATURE_COMPAT_FUNCS(imagic_inodes
, IMAGIC_INODES
)
1764 EXT4_FEATURE_COMPAT_FUNCS(journal
, HAS_JOURNAL
)
1765 EXT4_FEATURE_COMPAT_FUNCS(xattr
, EXT_ATTR
)
1766 EXT4_FEATURE_COMPAT_FUNCS(resize_inode
, RESIZE_INODE
)
1767 EXT4_FEATURE_COMPAT_FUNCS(dir_index
, DIR_INDEX
)
1768 EXT4_FEATURE_COMPAT_FUNCS(sparse_super2
, SPARSE_SUPER2
)
1770 EXT4_FEATURE_RO_COMPAT_FUNCS(sparse_super
, SPARSE_SUPER
)
1771 EXT4_FEATURE_RO_COMPAT_FUNCS(large_file
, LARGE_FILE
)
1772 EXT4_FEATURE_RO_COMPAT_FUNCS(btree_dir
, BTREE_DIR
)
1773 EXT4_FEATURE_RO_COMPAT_FUNCS(huge_file
, HUGE_FILE
)
1774 EXT4_FEATURE_RO_COMPAT_FUNCS(gdt_csum
, GDT_CSUM
)
1775 EXT4_FEATURE_RO_COMPAT_FUNCS(dir_nlink
, DIR_NLINK
)
1776 EXT4_FEATURE_RO_COMPAT_FUNCS(extra_isize
, EXTRA_ISIZE
)
1777 EXT4_FEATURE_RO_COMPAT_FUNCS(quota
, QUOTA
)
1778 EXT4_FEATURE_RO_COMPAT_FUNCS(bigalloc
, BIGALLOC
)
1779 EXT4_FEATURE_RO_COMPAT_FUNCS(metadata_csum
, METADATA_CSUM
)
1780 EXT4_FEATURE_RO_COMPAT_FUNCS(readonly
, READONLY
)
1781 EXT4_FEATURE_RO_COMPAT_FUNCS(project
, PROJECT
)
1783 EXT4_FEATURE_INCOMPAT_FUNCS(compression
, COMPRESSION
)
1784 EXT4_FEATURE_INCOMPAT_FUNCS(filetype
, FILETYPE
)
1785 EXT4_FEATURE_INCOMPAT_FUNCS(journal_needs_recovery
, RECOVER
)
1786 EXT4_FEATURE_INCOMPAT_FUNCS(journal_dev
, JOURNAL_DEV
)
1787 EXT4_FEATURE_INCOMPAT_FUNCS(meta_bg
, META_BG
)
1788 EXT4_FEATURE_INCOMPAT_FUNCS(extents
, EXTENTS
)
1789 EXT4_FEATURE_INCOMPAT_FUNCS(64bit
, 64BIT
)
1790 EXT4_FEATURE_INCOMPAT_FUNCS(mmp
, MMP
)
1791 EXT4_FEATURE_INCOMPAT_FUNCS(flex_bg
, FLEX_BG
)
1792 EXT4_FEATURE_INCOMPAT_FUNCS(ea_inode
, EA_INODE
)
1793 EXT4_FEATURE_INCOMPAT_FUNCS(dirdata
, DIRDATA
)
1794 EXT4_FEATURE_INCOMPAT_FUNCS(csum_seed
, CSUM_SEED
)
1795 EXT4_FEATURE_INCOMPAT_FUNCS(largedir
, LARGEDIR
)
1796 EXT4_FEATURE_INCOMPAT_FUNCS(inline_data
, INLINE_DATA
)
1797 EXT4_FEATURE_INCOMPAT_FUNCS(encrypt
, ENCRYPT
)
1799 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1800 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1801 EXT4_FEATURE_INCOMPAT_META_BG)
1802 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1803 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1804 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1806 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1807 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1808 EXT4_FEATURE_INCOMPAT_RECOVER| \
1809 EXT4_FEATURE_INCOMPAT_META_BG)
1810 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1811 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1812 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1814 #define EXT4_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1815 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1816 EXT4_FEATURE_INCOMPAT_RECOVER| \
1817 EXT4_FEATURE_INCOMPAT_META_BG| \
1818 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1819 EXT4_FEATURE_INCOMPAT_64BIT| \
1820 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1821 EXT4_FEATURE_INCOMPAT_MMP | \
1822 EXT4_FEATURE_INCOMPAT_INLINE_DATA | \
1823 EXT4_FEATURE_INCOMPAT_ENCRYPT | \
1824 EXT4_FEATURE_INCOMPAT_CSUM_SEED)
1825 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1826 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1827 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1828 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1829 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1830 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1831 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1832 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1833 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1834 EXT4_FEATURE_RO_COMPAT_QUOTA |\
1835 EXT4_FEATURE_RO_COMPAT_PROJECT)
1837 #define EXTN_FEATURE_FUNCS(ver) \
1838 static inline bool ext4_has_unknown_ext##ver##_compat_features(struct super_block *sb) \
1840 return ((EXT4_SB(sb)->s_es->s_feature_compat & \
1841 cpu_to_le32(~EXT##ver##_FEATURE_COMPAT_SUPP)) != 0); \
1843 static inline bool ext4_has_unknown_ext##ver##_ro_compat_features(struct super_block *sb) \
1845 return ((EXT4_SB(sb)->s_es->s_feature_ro_compat & \
1846 cpu_to_le32(~EXT##ver##_FEATURE_RO_COMPAT_SUPP)) != 0); \
1848 static inline bool ext4_has_unknown_ext##ver##_incompat_features(struct super_block *sb) \
1850 return ((EXT4_SB(sb)->s_es->s_feature_incompat & \
1851 cpu_to_le32(~EXT##ver##_FEATURE_INCOMPAT_SUPP)) != 0); \
1854 EXTN_FEATURE_FUNCS(2)
1855 EXTN_FEATURE_FUNCS(3)
1856 EXTN_FEATURE_FUNCS(4)
1858 static inline bool ext4_has_compat_features(struct super_block
*sb
)
1860 return (EXT4_SB(sb
)->s_es
->s_feature_compat
!= 0);
1862 static inline bool ext4_has_ro_compat_features(struct super_block
*sb
)
1864 return (EXT4_SB(sb
)->s_es
->s_feature_ro_compat
!= 0);
1866 static inline bool ext4_has_incompat_features(struct super_block
*sb
)
1868 return (EXT4_SB(sb
)->s_es
->s_feature_incompat
!= 0);
1872 * Default values for user and/or group using reserved blocks
1874 #define EXT4_DEF_RESUID 0
1875 #define EXT4_DEF_RESGID 0
1878 * Default project ID
1880 #define EXT4_DEF_PROJID 0
1882 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1885 * Default mount options
1887 #define EXT4_DEFM_DEBUG 0x0001
1888 #define EXT4_DEFM_BSDGROUPS 0x0002
1889 #define EXT4_DEFM_XATTR_USER 0x0004
1890 #define EXT4_DEFM_ACL 0x0008
1891 #define EXT4_DEFM_UID16 0x0010
1892 #define EXT4_DEFM_JMODE 0x0060
1893 #define EXT4_DEFM_JMODE_DATA 0x0020
1894 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1895 #define EXT4_DEFM_JMODE_WBACK 0x0060
1896 #define EXT4_DEFM_NOBARRIER 0x0100
1897 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1898 #define EXT4_DEFM_DISCARD 0x0400
1899 #define EXT4_DEFM_NODELALLOC 0x0800
1902 * Default journal batch times
1904 #define EXT4_DEF_MIN_BATCH_TIME 0
1905 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1908 * Minimum number of groups in a flexgroup before we separate out
1909 * directories into the first block group of a flexgroup
1911 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1914 * Structure of a directory entry
1916 #define EXT4_NAME_LEN 255
1918 struct ext4_dir_entry
{
1919 __le32 inode
; /* Inode number */
1920 __le16 rec_len
; /* Directory entry length */
1921 __le16 name_len
; /* Name length */
1922 char name
[EXT4_NAME_LEN
]; /* File name */
1926 * The new version of the directory entry. Since EXT4 structures are
1927 * stored in intel byte order, and the name_len field could never be
1928 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1931 struct ext4_dir_entry_2
{
1932 __le32 inode
; /* Inode number */
1933 __le16 rec_len
; /* Directory entry length */
1934 __u8 name_len
; /* Name length */
1936 char name
[EXT4_NAME_LEN
]; /* File name */
1940 * This is a bogus directory entry at the end of each leaf block that
1941 * records checksums.
1943 struct ext4_dir_entry_tail
{
1944 __le32 det_reserved_zero1
; /* Pretend to be unused */
1945 __le16 det_rec_len
; /* 12 */
1946 __u8 det_reserved_zero2
; /* Zero name length */
1947 __u8 det_reserved_ft
; /* 0xDE, fake file type */
1948 __le32 det_checksum
; /* crc32c(uuid+inum+dirblock) */
1951 #define EXT4_DIRENT_TAIL(block, blocksize) \
1952 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1954 sizeof(struct ext4_dir_entry_tail))))
1957 * Ext4 directory file types. Only the low 3 bits are used. The
1958 * other bits are reserved for now.
1960 #define EXT4_FT_UNKNOWN 0
1961 #define EXT4_FT_REG_FILE 1
1962 #define EXT4_FT_DIR 2
1963 #define EXT4_FT_CHRDEV 3
1964 #define EXT4_FT_BLKDEV 4
1965 #define EXT4_FT_FIFO 5
1966 #define EXT4_FT_SOCK 6
1967 #define EXT4_FT_SYMLINK 7
1969 #define EXT4_FT_MAX 8
1971 #define EXT4_FT_DIR_CSUM 0xDE
1974 * EXT4_DIR_PAD defines the directory entries boundaries
1976 * NOTE: It must be a multiple of 4
1978 #define EXT4_DIR_PAD 4
1979 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1980 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1982 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1985 * If we ever get support for fs block sizes > page_size, we'll need
1986 * to remove the #if statements in the next two functions...
1988 static inline unsigned int
1989 ext4_rec_len_from_disk(__le16 dlen
, unsigned blocksize
)
1991 unsigned len
= le16_to_cpu(dlen
);
1993 #if (PAGE_SIZE >= 65536)
1994 if (len
== EXT4_MAX_REC_LEN
|| len
== 0)
1996 return (len
& 65532) | ((len
& 3) << 16);
2002 static inline __le16
ext4_rec_len_to_disk(unsigned len
, unsigned blocksize
)
2004 if ((len
> blocksize
) || (blocksize
> (1 << 18)) || (len
& 3))
2006 #if (PAGE_SIZE >= 65536)
2008 return cpu_to_le16(len
);
2009 if (len
== blocksize
) {
2010 if (blocksize
== 65536)
2011 return cpu_to_le16(EXT4_MAX_REC_LEN
);
2013 return cpu_to_le16(0);
2015 return cpu_to_le16((len
& 65532) | ((len
>> 16) & 3));
2017 return cpu_to_le16(len
);
2022 * Hash Tree Directory indexing
2023 * (c) Daniel Phillips, 2001
2026 #define is_dx(dir) (ext4_has_feature_dir_index((dir)->i_sb) && \
2027 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
2028 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
2029 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
2031 /* Legal values for the dx_root hash_version field: */
2033 #define DX_HASH_LEGACY 0
2034 #define DX_HASH_HALF_MD4 1
2035 #define DX_HASH_TEA 2
2036 #define DX_HASH_LEGACY_UNSIGNED 3
2037 #define DX_HASH_HALF_MD4_UNSIGNED 4
2038 #define DX_HASH_TEA_UNSIGNED 5
2040 static inline u32
ext4_chksum(struct ext4_sb_info
*sbi
, u32 crc
,
2041 const void *address
, unsigned int length
)
2044 struct shash_desc shash
;
2049 BUG_ON(crypto_shash_descsize(sbi
->s_chksum_driver
)!=sizeof(desc
.ctx
));
2051 desc
.shash
.tfm
= sbi
->s_chksum_driver
;
2052 desc
.shash
.flags
= 0;
2053 *(u32
*)desc
.ctx
= crc
;
2055 err
= crypto_shash_update(&desc
.shash
, address
, length
);
2058 return *(u32
*)desc
.ctx
;
2063 /* hash info structure used by the directory hash */
2073 /* 32 and 64 bit signed EOF for dx directories */
2074 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
2075 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
2079 * Control parameters used by ext4_htree_next_block
2081 #define HASH_NB_ALWAYS 1
2083 struct ext4_filename
{
2084 const struct qstr
*usr_fname
;
2085 struct ext4_str disk_name
;
2086 struct dx_hash_info hinfo
;
2087 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2088 struct ext4_str crypto_buf
;
2092 #define fname_name(p) ((p)->disk_name.name)
2093 #define fname_len(p) ((p)->disk_name.len)
2096 * Describe an inode's exact location on disk and in memory
2100 struct buffer_head
*bh
;
2101 unsigned long offset
;
2102 ext4_group_t block_group
;
2105 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
2107 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
2111 * This structure is stuffed into the struct file's private_data field
2112 * for directories. It is where we put information so that we can do
2113 * readdir operations in hash tree order.
2115 struct dir_private_info
{
2116 struct rb_root root
;
2117 struct rb_node
*curr_node
;
2118 struct fname
*extra_fname
;
2121 __u32 curr_minor_hash
;
2125 /* calculate the first block number of the group */
2126 static inline ext4_fsblk_t
2127 ext4_group_first_block_no(struct super_block
*sb
, ext4_group_t group_no
)
2129 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
2130 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
2134 * Special error return code only used by dx_probe() and its callers.
2136 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
2139 * Timeout and state flag for lazy initialization inode thread.
2141 #define EXT4_DEF_LI_WAIT_MULT 10
2142 #define EXT4_DEF_LI_MAX_START_DELAY 5
2143 #define EXT4_LAZYINIT_QUIT 0x0001
2144 #define EXT4_LAZYINIT_RUNNING 0x0002
2147 * Lazy inode table initialization info
2149 struct ext4_lazy_init
{
2150 unsigned long li_state
;
2151 struct list_head li_request_list
;
2152 struct mutex li_list_mtx
;
2155 struct ext4_li_request
{
2156 struct super_block
*lr_super
;
2157 struct ext4_sb_info
*lr_sbi
;
2158 ext4_group_t lr_next_group
;
2159 struct list_head lr_request
;
2160 unsigned long lr_next_sched
;
2161 unsigned long lr_timeout
;
2164 struct ext4_features
{
2165 struct kobject f_kobj
;
2166 struct completion f_kobj_unregister
;
2170 * This structure will be used for multiple mount protection. It will be
2171 * written into the block number saved in the s_mmp_block field in the
2172 * superblock. Programs that check MMP should assume that if
2173 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
2174 * to use the filesystem, regardless of how old the timestamp is.
2176 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
2177 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
2178 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
2179 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
2182 __le32 mmp_magic
; /* Magic number for MMP */
2183 __le32 mmp_seq
; /* Sequence no. updated periodically */
2186 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
2187 * purposes and do not affect the correctness of the algorithm
2189 __le64 mmp_time
; /* Time last updated */
2190 char mmp_nodename
[64]; /* Node which last updated MMP block */
2191 char mmp_bdevname
[32]; /* Bdev which last updated MMP block */
2194 * mmp_check_interval is used to verify if the MMP block has been
2195 * updated on the block device. The value is updated based on the
2196 * maximum time to write the MMP block during an update cycle.
2198 __le16 mmp_check_interval
;
2201 __le32 mmp_pad2
[226];
2202 __le32 mmp_checksum
; /* crc32c(uuid+mmp_block) */
2205 /* arguments passed to the mmp thread */
2207 struct buffer_head
*bh
; /* bh from initial read_mmp_block() */
2208 struct super_block
*sb
; /* super block of the fs */
2212 * Check interval multiplier
2213 * The MMP block is written every update interval and initially checked every
2214 * update interval x the multiplier (the value is then adapted based on the
2215 * write latency). The reason is that writes can be delayed under load and we
2216 * don't want readers to incorrectly assume that the filesystem is no longer
2219 #define EXT4_MMP_CHECK_MULT 2UL
2222 * Minimum interval for MMP checking in seconds.
2224 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
2227 * Maximum interval for MMP checking in seconds.
2229 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
2232 * Function prototypes
2236 * Ok, these declarations are also in <linux/kernel.h> but none of the
2237 * ext4 source programs needs to include it so they are duplicated here.
2239 # define NORET_TYPE /**/
2240 # define ATTRIB_NORET __attribute__((noreturn))
2241 # define NORET_AND noreturn,
2244 extern unsigned int ext4_count_free(char *bitmap
, unsigned numchars
);
2245 void ext4_inode_bitmap_csum_set(struct super_block
*sb
, ext4_group_t group
,
2246 struct ext4_group_desc
*gdp
,
2247 struct buffer_head
*bh
, int sz
);
2248 int ext4_inode_bitmap_csum_verify(struct super_block
*sb
, ext4_group_t group
,
2249 struct ext4_group_desc
*gdp
,
2250 struct buffer_head
*bh
, int sz
);
2251 void ext4_block_bitmap_csum_set(struct super_block
*sb
, ext4_group_t group
,
2252 struct ext4_group_desc
*gdp
,
2253 struct buffer_head
*bh
);
2254 int ext4_block_bitmap_csum_verify(struct super_block
*sb
, ext4_group_t group
,
2255 struct ext4_group_desc
*gdp
,
2256 struct buffer_head
*bh
);
2259 extern void ext4_get_group_no_and_offset(struct super_block
*sb
,
2260 ext4_fsblk_t blocknr
,
2261 ext4_group_t
*blockgrpp
,
2262 ext4_grpblk_t
*offsetp
);
2263 extern ext4_group_t
ext4_get_group_number(struct super_block
*sb
,
2264 ext4_fsblk_t block
);
2266 extern unsigned int ext4_block_group(struct super_block
*sb
,
2267 ext4_fsblk_t blocknr
);
2268 extern ext4_grpblk_t
ext4_block_group_offset(struct super_block
*sb
,
2269 ext4_fsblk_t blocknr
);
2270 extern int ext4_bg_has_super(struct super_block
*sb
, ext4_group_t group
);
2271 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
,
2272 ext4_group_t group
);
2273 extern ext4_fsblk_t
ext4_new_meta_blocks(handle_t
*handle
, struct inode
*inode
,
2276 unsigned long *count
,
2278 extern int ext4_claim_free_clusters(struct ext4_sb_info
*sbi
,
2279 s64 nclusters
, unsigned int flags
);
2280 extern ext4_fsblk_t
ext4_count_free_clusters(struct super_block
*);
2281 extern void ext4_check_blocks_bitmap(struct super_block
*);
2282 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
2283 ext4_group_t block_group
,
2284 struct buffer_head
** bh
);
2285 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
2287 extern struct buffer_head
*ext4_read_block_bitmap_nowait(struct super_block
*sb
,
2288 ext4_group_t block_group
);
2289 extern int ext4_wait_block_bitmap(struct super_block
*sb
,
2290 ext4_group_t block_group
,
2291 struct buffer_head
*bh
);
2292 extern struct buffer_head
*ext4_read_block_bitmap(struct super_block
*sb
,
2293 ext4_group_t block_group
);
2294 extern unsigned ext4_free_clusters_after_init(struct super_block
*sb
,
2295 ext4_group_t block_group
,
2296 struct ext4_group_desc
*gdp
);
2297 ext4_fsblk_t
ext4_inode_to_goal_block(struct inode
*);
2299 /* crypto_policy.c */
2300 int ext4_is_child_context_consistent_with_parent(struct inode
*parent
,
2301 struct inode
*child
);
2302 int ext4_inherit_context(struct inode
*parent
, struct inode
*child
);
2303 void ext4_to_hex(char *dst
, char *src
, size_t src_size
);
2304 int ext4_process_policy(const struct ext4_encryption_policy
*policy
,
2305 struct inode
*inode
);
2306 int ext4_get_policy(struct inode
*inode
,
2307 struct ext4_encryption_policy
*policy
);
2310 extern struct kmem_cache
*ext4_crypt_info_cachep
;
2311 bool ext4_valid_contents_enc_mode(uint32_t mode
);
2312 uint32_t ext4_validate_encryption_key_size(uint32_t mode
, uint32_t size
);
2313 extern struct workqueue_struct
*ext4_read_workqueue
;
2314 struct ext4_crypto_ctx
*ext4_get_crypto_ctx(struct inode
*inode
,
2316 void ext4_release_crypto_ctx(struct ext4_crypto_ctx
*ctx
);
2317 void ext4_restore_control_page(struct page
*data_page
);
2318 struct page
*ext4_encrypt(struct inode
*inode
,
2319 struct page
*plaintext_page
,
2321 int ext4_decrypt(struct page
*page
);
2322 int ext4_encrypted_zeroout(struct inode
*inode
, ext4_lblk_t lblk
,
2323 ext4_fsblk_t pblk
, ext4_lblk_t len
);
2324 extern const struct dentry_operations ext4_encrypted_d_ops
;
2326 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2327 int ext4_init_crypto(void);
2328 void ext4_exit_crypto(void);
2329 static inline int ext4_sb_has_crypto(struct super_block
*sb
)
2331 return ext4_has_feature_encrypt(sb
);
2334 static inline int ext4_init_crypto(void) { return 0; }
2335 static inline void ext4_exit_crypto(void) { }
2336 static inline int ext4_sb_has_crypto(struct super_block
*sb
)
2342 /* crypto_fname.c */
2343 bool ext4_valid_filenames_enc_mode(uint32_t mode
);
2344 u32
ext4_fname_crypto_round_up(u32 size
, u32 blksize
);
2345 unsigned ext4_fname_encrypted_size(struct inode
*inode
, u32 ilen
);
2346 int ext4_fname_crypto_alloc_buffer(struct inode
*inode
,
2347 u32 ilen
, struct ext4_str
*crypto_str
);
2348 int _ext4_fname_disk_to_usr(struct inode
*inode
,
2349 struct dx_hash_info
*hinfo
,
2350 const struct ext4_str
*iname
,
2351 struct ext4_str
*oname
);
2352 int ext4_fname_disk_to_usr(struct inode
*inode
,
2353 struct dx_hash_info
*hinfo
,
2354 const struct ext4_dir_entry_2
*de
,
2355 struct ext4_str
*oname
);
2356 int ext4_fname_usr_to_disk(struct inode
*inode
,
2357 const struct qstr
*iname
,
2358 struct ext4_str
*oname
);
2359 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2360 void ext4_fname_crypto_free_buffer(struct ext4_str
*crypto_str
);
2361 int ext4_fname_setup_filename(struct inode
*dir
, const struct qstr
*iname
,
2362 int lookup
, struct ext4_filename
*fname
);
2363 void ext4_fname_free_filename(struct ext4_filename
*fname
);
2366 int ext4_setup_fname_crypto(struct inode
*inode
)
2370 static inline void ext4_fname_crypto_free_buffer(struct ext4_str
*p
) { }
2371 static inline int ext4_fname_setup_filename(struct inode
*dir
,
2372 const struct qstr
*iname
,
2373 int lookup
, struct ext4_filename
*fname
)
2375 fname
->usr_fname
= iname
;
2376 fname
->disk_name
.name
= (unsigned char *) iname
->name
;
2377 fname
->disk_name
.len
= iname
->len
;
2380 static inline void ext4_fname_free_filename(struct ext4_filename
*fname
) { }
2385 void ext4_free_crypt_info(struct ext4_crypt_info
*ci
);
2386 void ext4_free_encryption_info(struct inode
*inode
, struct ext4_crypt_info
*ci
);
2387 int _ext4_get_encryption_info(struct inode
*inode
);
2389 #ifdef CONFIG_EXT4_FS_ENCRYPTION
2390 int ext4_has_encryption_key(struct inode
*inode
);
2392 static inline int ext4_get_encryption_info(struct inode
*inode
)
2394 struct ext4_crypt_info
*ci
= EXT4_I(inode
)->i_crypt_info
;
2397 (ci
->ci_keyring_key
&&
2398 (ci
->ci_keyring_key
->flags
& ((1 << KEY_FLAG_INVALIDATED
) |
2399 (1 << KEY_FLAG_REVOKED
) |
2400 (1 << KEY_FLAG_DEAD
)))))
2401 return _ext4_get_encryption_info(inode
);
2405 static inline struct ext4_crypt_info
*ext4_encryption_info(struct inode
*inode
)
2407 return EXT4_I(inode
)->i_crypt_info
;
2411 static inline int ext4_has_encryption_key(struct inode
*inode
)
2415 static inline int ext4_get_encryption_info(struct inode
*inode
)
2419 static inline struct ext4_crypt_info
*ext4_encryption_info(struct inode
*inode
)
2427 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode
*,
2429 struct ext4_dir_entry_2
*,
2430 struct buffer_head
*, char *, int,
2432 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2433 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2434 (de), (bh), (buf), (size), (offset)))
2435 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
2437 struct ext4_dir_entry_2
*dirent
,
2438 struct ext4_str
*ent_name
);
2439 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
2440 extern int ext4_find_dest_de(struct inode
*dir
, struct inode
*inode
,
2441 struct buffer_head
*bh
,
2442 void *buf
, int buf_size
,
2443 struct ext4_filename
*fname
,
2444 struct ext4_dir_entry_2
**dest_de
);
2445 int ext4_insert_dentry(struct inode
*dir
,
2446 struct inode
*inode
,
2447 struct ext4_dir_entry_2
*de
,
2449 struct ext4_filename
*fname
);
2450 static inline void ext4_update_dx_flag(struct inode
*inode
)
2452 if (!ext4_has_feature_dir_index(inode
->i_sb
))
2453 ext4_clear_inode_flag(inode
, EXT4_INODE_INDEX
);
2455 static unsigned char ext4_filetype_table
[] = {
2456 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
2459 static inline unsigned char get_dtype(struct super_block
*sb
, int filetype
)
2461 if (!ext4_has_feature_filetype(sb
) || filetype
>= EXT4_FT_MAX
)
2464 return ext4_filetype_table
[filetype
];
2466 extern int ext4_check_all_de(struct inode
*dir
, struct buffer_head
*bh
,
2467 void *buf
, int buf_size
);
2470 extern int ext4_sync_file(struct file
*, loff_t
, loff_t
, int);
2473 extern int ext4fs_dirhash(const char *name
, int len
, struct
2474 dx_hash_info
*hinfo
);
2477 extern struct inode
*__ext4_new_inode(handle_t
*, struct inode
*, umode_t
,
2478 const struct qstr
*qstr
, __u32 goal
,
2479 uid_t
*owner
, int handle_type
,
2480 unsigned int line_no
, int nblocks
);
2482 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2483 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2485 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2487 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2488 (type), __LINE__, (nblocks))
2491 extern void ext4_free_inode(handle_t
*, struct inode
*);
2492 extern struct inode
* ext4_orphan_get(struct super_block
*, unsigned long);
2493 extern unsigned long ext4_count_free_inodes(struct super_block
*);
2494 extern unsigned long ext4_count_dirs(struct super_block
*);
2495 extern void ext4_check_inodes_bitmap(struct super_block
*);
2496 extern void ext4_mark_bitmap_end(int start_bit
, int end_bit
, char *bitmap
);
2497 extern int ext4_init_inode_table(struct super_block
*sb
,
2498 ext4_group_t group
, int barrier
);
2499 extern void ext4_end_bitmap_read(struct buffer_head
*bh
, int uptodate
);
2502 extern const struct file_operations ext4_seq_mb_groups_fops
;
2503 extern long ext4_mb_stats
;
2504 extern long ext4_mb_max_to_scan
;
2505 extern int ext4_mb_init(struct super_block
*);
2506 extern int ext4_mb_release(struct super_block
*);
2507 extern ext4_fsblk_t
ext4_mb_new_blocks(handle_t
*,
2508 struct ext4_allocation_request
*, int *);
2509 extern int ext4_mb_reserve_blocks(struct super_block
*, int);
2510 extern void ext4_discard_preallocations(struct inode
*);
2511 extern int __init
ext4_init_mballoc(void);
2512 extern void ext4_exit_mballoc(void);
2513 extern void ext4_free_blocks(handle_t
*handle
, struct inode
*inode
,
2514 struct buffer_head
*bh
, ext4_fsblk_t block
,
2515 unsigned long count
, int flags
);
2516 extern int ext4_mb_alloc_groupinfo(struct super_block
*sb
,
2517 ext4_group_t ngroups
);
2518 extern int ext4_mb_add_groupinfo(struct super_block
*sb
,
2519 ext4_group_t i
, struct ext4_group_desc
*desc
);
2520 extern int ext4_group_add_blocks(handle_t
*handle
, struct super_block
*sb
,
2521 ext4_fsblk_t block
, unsigned long count
);
2522 extern int ext4_trim_fs(struct super_block
*, struct fstrim_range
*);
2525 int ext4_inode_is_fast_symlink(struct inode
*inode
);
2526 struct buffer_head
*ext4_getblk(handle_t
*, struct inode
*, ext4_lblk_t
, int);
2527 struct buffer_head
*ext4_bread(handle_t
*, struct inode
*, ext4_lblk_t
, int);
2528 int ext4_get_block_unwritten(struct inode
*inode
, sector_t iblock
,
2529 struct buffer_head
*bh_result
, int create
);
2530 int ext4_dax_get_block(struct inode
*inode
, sector_t iblock
,
2531 struct buffer_head
*bh_result
, int create
);
2532 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
2533 struct buffer_head
*bh_result
, int create
);
2534 int ext4_dio_get_block(struct inode
*inode
, sector_t iblock
,
2535 struct buffer_head
*bh_result
, int create
);
2536 int ext4_da_get_block_prep(struct inode
*inode
, sector_t iblock
,
2537 struct buffer_head
*bh
, int create
);
2538 int ext4_walk_page_buffers(handle_t
*handle
,
2539 struct buffer_head
*head
,
2543 int (*fn
)(handle_t
*handle
,
2544 struct buffer_head
*bh
));
2545 int do_journal_get_write_access(handle_t
*handle
,
2546 struct buffer_head
*bh
);
2547 #define FALL_BACK_TO_NONDELALLOC 1
2548 #define CONVERT_INLINE_DATA 2
2550 extern struct inode
*ext4_iget(struct super_block
*, unsigned long);
2551 extern struct inode
*ext4_iget_normal(struct super_block
*, unsigned long);
2552 extern int ext4_write_inode(struct inode
*, struct writeback_control
*);
2553 extern int ext4_setattr(struct dentry
*, struct iattr
*);
2554 extern int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
2555 struct kstat
*stat
);
2556 extern void ext4_evict_inode(struct inode
*);
2557 extern void ext4_clear_inode(struct inode
*);
2558 extern int ext4_sync_inode(handle_t
*, struct inode
*);
2559 extern void ext4_dirty_inode(struct inode
*, int);
2560 extern int ext4_change_inode_journal_flag(struct inode
*, int);
2561 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
2562 extern int ext4_inode_attach_jinode(struct inode
*inode
);
2563 extern int ext4_can_truncate(struct inode
*inode
);
2564 extern void ext4_truncate(struct inode
*);
2565 extern int ext4_punch_hole(struct inode
*inode
, loff_t offset
, loff_t length
);
2566 extern int ext4_truncate_restart_trans(handle_t
*, struct inode
*, int nblocks
);
2567 extern void ext4_set_inode_flags(struct inode
*);
2568 extern void ext4_get_inode_flags(struct ext4_inode_info
*);
2569 extern int ext4_alloc_da_blocks(struct inode
*inode
);
2570 extern void ext4_set_aops(struct inode
*inode
);
2571 extern int ext4_writepage_trans_blocks(struct inode
*);
2572 extern int ext4_chunk_trans_blocks(struct inode
*, int nrblocks
);
2573 extern int ext4_zero_partial_blocks(handle_t
*handle
, struct inode
*inode
,
2574 loff_t lstart
, loff_t lend
);
2575 extern int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2576 extern int ext4_filemap_fault(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2577 extern qsize_t
*ext4_get_reserved_space(struct inode
*inode
);
2578 extern int ext4_get_projid(struct inode
*inode
, kprojid_t
*projid
);
2579 extern void ext4_da_update_reserve_space(struct inode
*inode
,
2580 int used
, int quota_claim
);
2581 extern int ext4_issue_zeroout(struct inode
*inode
, ext4_lblk_t lblk
,
2582 ext4_fsblk_t pblk
, ext4_lblk_t len
);
2583 extern int ext4_get_next_extent(struct inode
*inode
, ext4_lblk_t lblk
,
2584 unsigned int map_len
,
2585 struct extent_status
*result
);
2588 extern int ext4_ind_map_blocks(handle_t
*handle
, struct inode
*inode
,
2589 struct ext4_map_blocks
*map
, int flags
);
2590 extern int ext4_ind_calc_metadata_amount(struct inode
*inode
, sector_t lblock
);
2591 extern int ext4_ind_trans_blocks(struct inode
*inode
, int nrblocks
);
2592 extern void ext4_ind_truncate(handle_t
*, struct inode
*inode
);
2593 extern int ext4_ind_remove_space(handle_t
*handle
, struct inode
*inode
,
2594 ext4_lblk_t start
, ext4_lblk_t end
);
2597 extern long ext4_ioctl(struct file
*, unsigned int, unsigned long);
2598 extern long ext4_compat_ioctl(struct file
*, unsigned int, unsigned long);
2601 extern int ext4_ext_migrate(struct inode
*);
2602 extern int ext4_ind_migrate(struct inode
*inode
);
2605 extern int ext4_dirent_csum_verify(struct inode
*inode
,
2606 struct ext4_dir_entry
*dirent
);
2607 extern int ext4_orphan_add(handle_t
*, struct inode
*);
2608 extern int ext4_orphan_del(handle_t
*, struct inode
*);
2609 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
2610 __u32 start_minor_hash
, __u32
*next_hash
);
2611 extern int ext4_search_dir(struct buffer_head
*bh
,
2615 struct ext4_filename
*fname
,
2616 const struct qstr
*d_name
,
2617 unsigned int offset
,
2618 struct ext4_dir_entry_2
**res_dir
);
2619 extern int ext4_generic_delete_entry(handle_t
*handle
,
2621 struct ext4_dir_entry_2
*de_del
,
2622 struct buffer_head
*bh
,
2626 extern int ext4_empty_dir(struct inode
*inode
);
2629 extern int ext4_group_add(struct super_block
*sb
,
2630 struct ext4_new_group_data
*input
);
2631 extern int ext4_group_extend(struct super_block
*sb
,
2632 struct ext4_super_block
*es
,
2633 ext4_fsblk_t n_blocks_count
);
2634 extern int ext4_resize_fs(struct super_block
*sb
, ext4_fsblk_t n_blocks_count
);
2637 extern int ext4_seq_options_show(struct seq_file
*seq
, void *offset
);
2638 extern int ext4_calculate_overhead(struct super_block
*sb
);
2639 extern void ext4_superblock_csum_set(struct super_block
*sb
);
2640 extern void *ext4_kvmalloc(size_t size
, gfp_t flags
);
2641 extern void *ext4_kvzalloc(size_t size
, gfp_t flags
);
2642 extern int ext4_alloc_flex_bg_array(struct super_block
*sb
,
2643 ext4_group_t ngroup
);
2644 extern const char *ext4_decode_error(struct super_block
*sb
, int errno
,
2647 extern __printf(4, 5)
2648 void __ext4_error(struct super_block
*, const char *, unsigned int,
2650 extern __printf(5, 6)
2651 void __ext4_error_inode(struct inode
*, const char *, unsigned int, ext4_fsblk_t
,
2653 extern __printf(5, 6)
2654 void __ext4_error_file(struct file
*, const char *, unsigned int, ext4_fsblk_t
,
2656 extern void __ext4_std_error(struct super_block
*, const char *,
2658 extern __printf(4, 5)
2659 void __ext4_abort(struct super_block
*, const char *, unsigned int,
2661 extern __printf(4, 5)
2662 void __ext4_warning(struct super_block
*, const char *, unsigned int,
2664 extern __printf(4, 5)
2665 void __ext4_warning_inode(const struct inode
*inode
, const char *function
,
2666 unsigned int line
, const char *fmt
, ...);
2667 extern __printf(3, 4)
2668 void __ext4_msg(struct super_block
*, const char *, const char *, ...);
2669 extern void __dump_mmp_msg(struct super_block
*, struct mmp_struct
*mmp
,
2670 const char *, unsigned int, const char *);
2671 extern __printf(7, 8)
2672 void __ext4_grp_locked_error(const char *, unsigned int,
2673 struct super_block
*, ext4_group_t
,
2674 unsigned long, ext4_fsblk_t
,
2677 #define EXT4_ERROR_INODE(inode, fmt, a...) \
2678 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
2680 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
2681 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
2683 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
2684 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
2686 #ifdef CONFIG_PRINTK
2688 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2689 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2690 #define ext4_error_file(file, func, line, block, fmt, ...) \
2691 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2692 #define ext4_error(sb, fmt, ...) \
2693 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2694 #define ext4_abort(sb, fmt, ...) \
2695 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2696 #define ext4_warning(sb, fmt, ...) \
2697 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2698 #define ext4_warning_inode(inode, fmt, ...) \
2699 __ext4_warning_inode(inode, __func__, __LINE__, fmt, ##__VA_ARGS__)
2700 #define ext4_msg(sb, level, fmt, ...) \
2701 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2702 #define dump_mmp_msg(sb, mmp, msg) \
2703 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2704 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2705 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2710 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2712 no_printk(fmt, ##__VA_ARGS__); \
2713 __ext4_error_inode(inode, "", 0, block, " "); \
2715 #define ext4_error_file(file, func, line, block, fmt, ...) \
2717 no_printk(fmt, ##__VA_ARGS__); \
2718 __ext4_error_file(file, "", 0, block, " "); \
2720 #define ext4_error(sb, fmt, ...) \
2722 no_printk(fmt, ##__VA_ARGS__); \
2723 __ext4_error(sb, "", 0, " "); \
2725 #define ext4_abort(sb, fmt, ...) \
2727 no_printk(fmt, ##__VA_ARGS__); \
2728 __ext4_abort(sb, "", 0, " "); \
2730 #define ext4_warning(sb, fmt, ...) \
2732 no_printk(fmt, ##__VA_ARGS__); \
2733 __ext4_warning(sb, "", 0, " "); \
2735 #define ext4_warning_inode(inode, fmt, ...) \
2737 no_printk(fmt, ##__VA_ARGS__); \
2738 __ext4_warning_inode(inode, "", 0, " "); \
2740 #define ext4_msg(sb, level, fmt, ...) \
2742 no_printk(fmt, ##__VA_ARGS__); \
2743 __ext4_msg(sb, "", " "); \
2745 #define dump_mmp_msg(sb, mmp, msg) \
2746 __dump_mmp_msg(sb, mmp, "", 0, "")
2747 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2749 no_printk(fmt, ##__VA_ARGS__); \
2750 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2755 extern void ext4_update_dynamic_rev(struct super_block
*sb
);
2756 extern int ext4_update_compat_feature(handle_t
*handle
, struct super_block
*sb
,
2758 extern int ext4_update_rocompat_feature(handle_t
*handle
,
2759 struct super_block
*sb
, __u32 rocompat
);
2760 extern int ext4_update_incompat_feature(handle_t
*handle
,
2761 struct super_block
*sb
, __u32 incompat
);
2762 extern ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
2763 struct ext4_group_desc
*bg
);
2764 extern ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
2765 struct ext4_group_desc
*bg
);
2766 extern ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
2767 struct ext4_group_desc
*bg
);
2768 extern __u32
ext4_free_group_clusters(struct super_block
*sb
,
2769 struct ext4_group_desc
*bg
);
2770 extern __u32
ext4_free_inodes_count(struct super_block
*sb
,
2771 struct ext4_group_desc
*bg
);
2772 extern __u32
ext4_used_dirs_count(struct super_block
*sb
,
2773 struct ext4_group_desc
*bg
);
2774 extern __u32
ext4_itable_unused_count(struct super_block
*sb
,
2775 struct ext4_group_desc
*bg
);
2776 extern void ext4_block_bitmap_set(struct super_block
*sb
,
2777 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2778 extern void ext4_inode_bitmap_set(struct super_block
*sb
,
2779 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2780 extern void ext4_inode_table_set(struct super_block
*sb
,
2781 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2782 extern void ext4_free_group_clusters_set(struct super_block
*sb
,
2783 struct ext4_group_desc
*bg
,
2785 extern void ext4_free_inodes_set(struct super_block
*sb
,
2786 struct ext4_group_desc
*bg
, __u32 count
);
2787 extern void ext4_used_dirs_set(struct super_block
*sb
,
2788 struct ext4_group_desc
*bg
, __u32 count
);
2789 extern void ext4_itable_unused_set(struct super_block
*sb
,
2790 struct ext4_group_desc
*bg
, __u32 count
);
2791 extern int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 group
,
2792 struct ext4_group_desc
*gdp
);
2793 extern void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 group
,
2794 struct ext4_group_desc
*gdp
);
2795 extern int ext4_register_li_request(struct super_block
*sb
,
2796 ext4_group_t first_not_zeroed
);
2798 static inline int ext4_has_group_desc_csum(struct super_block
*sb
)
2800 return ext4_has_feature_gdt_csum(sb
) ||
2801 EXT4_SB(sb
)->s_chksum_driver
!= NULL
;
2804 static inline int ext4_has_metadata_csum(struct super_block
*sb
)
2806 WARN_ON_ONCE(ext4_has_feature_metadata_csum(sb
) &&
2807 !EXT4_SB(sb
)->s_chksum_driver
);
2809 return (EXT4_SB(sb
)->s_chksum_driver
!= NULL
);
2811 static inline ext4_fsblk_t
ext4_blocks_count(struct ext4_super_block
*es
)
2813 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_blocks_count_hi
) << 32) |
2814 le32_to_cpu(es
->s_blocks_count_lo
);
2817 static inline ext4_fsblk_t
ext4_r_blocks_count(struct ext4_super_block
*es
)
2819 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_r_blocks_count_hi
) << 32) |
2820 le32_to_cpu(es
->s_r_blocks_count_lo
);
2823 static inline ext4_fsblk_t
ext4_free_blocks_count(struct ext4_super_block
*es
)
2825 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_free_blocks_count_hi
) << 32) |
2826 le32_to_cpu(es
->s_free_blocks_count_lo
);
2829 static inline void ext4_blocks_count_set(struct ext4_super_block
*es
,
2832 es
->s_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2833 es
->s_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2836 static inline void ext4_free_blocks_count_set(struct ext4_super_block
*es
,
2839 es
->s_free_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2840 es
->s_free_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2843 static inline void ext4_r_blocks_count_set(struct ext4_super_block
*es
,
2846 es
->s_r_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2847 es
->s_r_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2850 static inline loff_t
ext4_isize(struct ext4_inode
*raw_inode
)
2852 if (S_ISREG(le16_to_cpu(raw_inode
->i_mode
)))
2853 return ((loff_t
)le32_to_cpu(raw_inode
->i_size_high
) << 32) |
2854 le32_to_cpu(raw_inode
->i_size_lo
);
2856 return (loff_t
) le32_to_cpu(raw_inode
->i_size_lo
);
2859 static inline void ext4_isize_set(struct ext4_inode
*raw_inode
, loff_t i_size
)
2861 raw_inode
->i_size_lo
= cpu_to_le32(i_size
);
2862 raw_inode
->i_size_high
= cpu_to_le32(i_size
>> 32);
2866 struct ext4_group_info
*ext4_get_group_info(struct super_block
*sb
,
2869 struct ext4_group_info
***grp_info
;
2870 long indexv
, indexh
;
2871 BUG_ON(group
>= EXT4_SB(sb
)->s_groups_count
);
2872 grp_info
= EXT4_SB(sb
)->s_group_info
;
2873 indexv
= group
>> (EXT4_DESC_PER_BLOCK_BITS(sb
));
2874 indexh
= group
& ((EXT4_DESC_PER_BLOCK(sb
)) - 1);
2875 return grp_info
[indexv
][indexh
];
2879 * Reading s_groups_count requires using smp_rmb() afterwards. See
2880 * the locking protocol documented in the comments of ext4_group_add()
2883 static inline ext4_group_t
ext4_get_groups_count(struct super_block
*sb
)
2885 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2891 static inline ext4_group_t
ext4_flex_group(struct ext4_sb_info
*sbi
,
2892 ext4_group_t block_group
)
2894 return block_group
>> sbi
->s_log_groups_per_flex
;
2897 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info
*sbi
)
2899 return 1 << sbi
->s_log_groups_per_flex
;
2902 #define ext4_std_error(sb, errno) \
2905 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2909 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2910 * counters. So we need to make sure we have free clusters more
2911 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2913 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2915 #define EXT4_FREECLUSTERS_WATERMARK 0
2918 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2919 static inline void ext4_update_i_disksize(struct inode
*inode
, loff_t newsize
)
2921 WARN_ON_ONCE(S_ISREG(inode
->i_mode
) &&
2922 !inode_is_locked(inode
));
2923 down_write(&EXT4_I(inode
)->i_data_sem
);
2924 if (newsize
> EXT4_I(inode
)->i_disksize
)
2925 EXT4_I(inode
)->i_disksize
= newsize
;
2926 up_write(&EXT4_I(inode
)->i_data_sem
);
2929 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2930 static inline int ext4_update_inode_size(struct inode
*inode
, loff_t newsize
)
2934 if (newsize
> inode
->i_size
) {
2935 i_size_write(inode
, newsize
);
2938 if (newsize
> EXT4_I(inode
)->i_disksize
) {
2939 ext4_update_i_disksize(inode
, newsize
);
2945 int ext4_update_disksize_before_punch(struct inode
*inode
, loff_t offset
,
2948 struct ext4_group_info
{
2949 unsigned long bb_state
;
2950 struct rb_root bb_free_root
;
2951 ext4_grpblk_t bb_first_free
; /* first free block */
2952 ext4_grpblk_t bb_free
; /* total free blocks */
2953 ext4_grpblk_t bb_fragments
; /* nr of freespace fragments */
2954 ext4_grpblk_t bb_largest_free_order
;/* order of largest frag in BG */
2955 struct list_head bb_prealloc_list
;
2959 struct rw_semaphore alloc_sem
;
2960 ext4_grpblk_t bb_counters
[]; /* Nr of free power-of-two-block
2961 * regions, index is order.
2962 * bb_counters[3] = 5 means
2963 * 5 free 8-block regions. */
2966 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2967 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2968 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2969 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2971 #define EXT4_MB_GRP_NEED_INIT(grp) \
2972 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2973 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2974 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2975 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2976 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2978 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2979 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2980 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2981 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2982 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2983 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2985 #define EXT4_MAX_CONTENTION 8
2986 #define EXT4_CONTENTION_THRESHOLD 2
2988 static inline spinlock_t
*ext4_group_lock_ptr(struct super_block
*sb
,
2991 return bgl_lock_ptr(EXT4_SB(sb
)->s_blockgroup_lock
, group
);
2995 * Returns true if the filesystem is busy enough that attempts to
2996 * access the block group locks has run into contention.
2998 static inline int ext4_fs_is_busy(struct ext4_sb_info
*sbi
)
3000 return (atomic_read(&sbi
->s_lock_busy
) > EXT4_CONTENTION_THRESHOLD
);
3003 static inline void ext4_lock_group(struct super_block
*sb
, ext4_group_t group
)
3005 spinlock_t
*lock
= ext4_group_lock_ptr(sb
, group
);
3006 if (spin_trylock(lock
))
3008 * We're able to grab the lock right away, so drop the
3009 * lock contention counter.
3011 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, -1, 0);
3014 * The lock is busy, so bump the contention counter,
3015 * and then wait on the spin lock.
3017 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, 1,
3018 EXT4_MAX_CONTENTION
);
3023 static inline void ext4_unlock_group(struct super_block
*sb
,
3026 spin_unlock(ext4_group_lock_ptr(sb
, group
));
3030 * Block validity checking
3032 #define ext4_check_indirect_blockref(inode, bh) \
3033 ext4_check_blockref(__func__, __LINE__, inode, \
3034 (__le32 *)(bh)->b_data, \
3035 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
3037 #define ext4_ind_check_inode(inode) \
3038 ext4_check_blockref(__func__, __LINE__, inode, \
3039 EXT4_I(inode)->i_data, \
3043 * Inodes and files operations
3047 extern const struct file_operations ext4_dir_operations
;
3050 extern const struct inode_operations ext4_file_inode_operations
;
3051 extern const struct file_operations ext4_file_operations
;
3052 extern loff_t
ext4_llseek(struct file
*file
, loff_t offset
, int origin
);
3055 extern int ext4_get_max_inline_size(struct inode
*inode
);
3056 extern int ext4_find_inline_data_nolock(struct inode
*inode
);
3057 extern int ext4_init_inline_data(handle_t
*handle
, struct inode
*inode
,
3059 extern int ext4_destroy_inline_data(handle_t
*handle
, struct inode
*inode
);
3061 extern int ext4_readpage_inline(struct inode
*inode
, struct page
*page
);
3062 extern int ext4_try_to_write_inline_data(struct address_space
*mapping
,
3063 struct inode
*inode
,
3064 loff_t pos
, unsigned len
,
3066 struct page
**pagep
);
3067 extern int ext4_write_inline_data_end(struct inode
*inode
,
3068 loff_t pos
, unsigned len
,
3071 extern struct buffer_head
*
3072 ext4_journalled_write_inline_data(struct inode
*inode
,
3075 extern int ext4_da_write_inline_data_begin(struct address_space
*mapping
,
3076 struct inode
*inode
,
3077 loff_t pos
, unsigned len
,
3079 struct page
**pagep
,
3081 extern int ext4_da_write_inline_data_end(struct inode
*inode
, loff_t pos
,
3082 unsigned len
, unsigned copied
,
3084 extern int ext4_try_add_inline_entry(handle_t
*handle
,
3085 struct ext4_filename
*fname
,
3086 struct inode
*dir
, struct inode
*inode
);
3087 extern int ext4_try_create_inline_dir(handle_t
*handle
,
3088 struct inode
*parent
,
3089 struct inode
*inode
);
3090 extern int ext4_read_inline_dir(struct file
*filp
,
3091 struct dir_context
*ctx
,
3092 int *has_inline_data
);
3093 extern int htree_inlinedir_to_tree(struct file
*dir_file
,
3094 struct inode
*dir
, ext4_lblk_t block
,
3095 struct dx_hash_info
*hinfo
,
3096 __u32 start_hash
, __u32 start_minor_hash
,
3097 int *has_inline_data
);
3098 extern struct buffer_head
*ext4_find_inline_entry(struct inode
*dir
,
3099 struct ext4_filename
*fname
,
3100 const struct qstr
*d_name
,
3101 struct ext4_dir_entry_2
**res_dir
,
3102 int *has_inline_data
);
3103 extern int ext4_delete_inline_entry(handle_t
*handle
,
3105 struct ext4_dir_entry_2
*de_del
,
3106 struct buffer_head
*bh
,
3107 int *has_inline_data
);
3108 extern int empty_inline_dir(struct inode
*dir
, int *has_inline_data
);
3109 extern struct buffer_head
*ext4_get_first_inline_block(struct inode
*inode
,
3110 struct ext4_dir_entry_2
**parent_de
,
3112 extern int ext4_inline_data_fiemap(struct inode
*inode
,
3113 struct fiemap_extent_info
*fieinfo
,
3114 int *has_inline
, __u64 start
, __u64 len
);
3115 extern int ext4_try_to_evict_inline_data(handle_t
*handle
,
3116 struct inode
*inode
,
3118 extern void ext4_inline_data_truncate(struct inode
*inode
, int *has_inline
);
3120 extern int ext4_convert_inline_data(struct inode
*inode
);
3122 static inline int ext4_has_inline_data(struct inode
*inode
)
3124 return ext4_test_inode_flag(inode
, EXT4_INODE_INLINE_DATA
) &&
3125 EXT4_I(inode
)->i_inline_off
;
3129 extern const struct inode_operations ext4_dir_inode_operations
;
3130 extern const struct inode_operations ext4_special_inode_operations
;
3131 extern struct dentry
*ext4_get_parent(struct dentry
*child
);
3132 extern struct ext4_dir_entry_2
*ext4_init_dot_dotdot(struct inode
*inode
,
3133 struct ext4_dir_entry_2
*de
,
3134 int blocksize
, int csum_size
,
3135 unsigned int parent_ino
, int dotdot_real_len
);
3136 extern void initialize_dirent_tail(struct ext4_dir_entry_tail
*t
,
3137 unsigned int blocksize
);
3138 extern int ext4_handle_dirty_dirent_node(handle_t
*handle
,
3139 struct inode
*inode
,
3140 struct buffer_head
*bh
);
3142 static unsigned char ext4_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
3143 [S_IFREG
>> S_SHIFT
] = EXT4_FT_REG_FILE
,
3144 [S_IFDIR
>> S_SHIFT
] = EXT4_FT_DIR
,
3145 [S_IFCHR
>> S_SHIFT
] = EXT4_FT_CHRDEV
,
3146 [S_IFBLK
>> S_SHIFT
] = EXT4_FT_BLKDEV
,
3147 [S_IFIFO
>> S_SHIFT
] = EXT4_FT_FIFO
,
3148 [S_IFSOCK
>> S_SHIFT
] = EXT4_FT_SOCK
,
3149 [S_IFLNK
>> S_SHIFT
] = EXT4_FT_SYMLINK
,
3152 static inline void ext4_set_de_type(struct super_block
*sb
,
3153 struct ext4_dir_entry_2
*de
,
3155 if (ext4_has_feature_filetype(sb
))
3156 de
->file_type
= ext4_type_by_mode
[(mode
& S_IFMT
)>>S_SHIFT
];
3160 extern int ext4_mpage_readpages(struct address_space
*mapping
,
3161 struct list_head
*pages
, struct page
*page
,
3165 extern const struct inode_operations ext4_encrypted_symlink_inode_operations
;
3166 extern const struct inode_operations ext4_symlink_inode_operations
;
3167 extern const struct inode_operations ext4_fast_symlink_inode_operations
;
3170 extern int ext4_register_sysfs(struct super_block
*sb
);
3171 extern void ext4_unregister_sysfs(struct super_block
*sb
);
3172 extern int __init
ext4_init_sysfs(void);
3173 extern void ext4_exit_sysfs(void);
3175 /* block_validity */
3176 extern void ext4_release_system_zone(struct super_block
*sb
);
3177 extern int ext4_setup_system_zone(struct super_block
*sb
);
3178 extern int __init
ext4_init_system_zone(void);
3179 extern void ext4_exit_system_zone(void);
3180 extern int ext4_data_block_valid(struct ext4_sb_info
*sbi
,
3181 ext4_fsblk_t start_blk
,
3182 unsigned int count
);
3183 extern int ext4_check_blockref(const char *, unsigned int,
3184 struct inode
*, __le32
*, unsigned int);
3187 struct ext4_ext_path
;
3191 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
3194 #define EXT_MAX_BLOCKS 0xffffffff
3196 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
3197 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
3198 extern int ext4_ext_index_trans_blocks(struct inode
*inode
, int extents
);
3199 extern int ext4_ext_map_blocks(handle_t
*handle
, struct inode
*inode
,
3200 struct ext4_map_blocks
*map
, int flags
);
3201 extern void ext4_ext_truncate(handle_t
*, struct inode
*);
3202 extern int ext4_ext_remove_space(struct inode
*inode
, ext4_lblk_t start
,
3204 extern void ext4_ext_init(struct super_block
*);
3205 extern void ext4_ext_release(struct super_block
*);
3206 extern long ext4_fallocate(struct file
*file
, int mode
, loff_t offset
,
3208 extern int ext4_convert_unwritten_extents(handle_t
*handle
, struct inode
*inode
,
3209 loff_t offset
, ssize_t len
);
3210 extern int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
3211 struct ext4_map_blocks
*map
, int flags
);
3212 extern int ext4_ext_calc_metadata_amount(struct inode
*inode
,
3213 ext4_lblk_t lblocks
);
3214 extern int ext4_ext_calc_credits_for_single_extent(struct inode
*inode
,
3216 struct ext4_ext_path
*path
);
3217 extern int ext4_can_extents_be_merged(struct inode
*inode
,
3218 struct ext4_extent
*ex1
,
3219 struct ext4_extent
*ex2
);
3220 extern int ext4_ext_insert_extent(handle_t
*, struct inode
*,
3221 struct ext4_ext_path
**,
3222 struct ext4_extent
*, int);
3223 extern struct ext4_ext_path
*ext4_find_extent(struct inode
*, ext4_lblk_t
,
3224 struct ext4_ext_path
**,
3226 extern void ext4_ext_drop_refs(struct ext4_ext_path
*);
3227 extern int ext4_ext_check_inode(struct inode
*inode
);
3228 extern int ext4_find_delalloc_range(struct inode
*inode
,
3229 ext4_lblk_t lblk_start
,
3230 ext4_lblk_t lblk_end
);
3231 extern int ext4_find_delalloc_cluster(struct inode
*inode
, ext4_lblk_t lblk
);
3232 extern ext4_lblk_t
ext4_ext_next_allocated_block(struct ext4_ext_path
*path
);
3233 extern int ext4_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
3234 __u64 start
, __u64 len
);
3235 extern int ext4_ext_precache(struct inode
*inode
);
3236 extern int ext4_collapse_range(struct inode
*inode
, loff_t offset
, loff_t len
);
3237 extern int ext4_insert_range(struct inode
*inode
, loff_t offset
, loff_t len
);
3238 extern int ext4_swap_extents(handle_t
*handle
, struct inode
*inode1
,
3239 struct inode
*inode2
, ext4_lblk_t lblk1
,
3240 ext4_lblk_t lblk2
, ext4_lblk_t count
,
3241 int mark_unwritten
,int *err
);
3244 extern void ext4_double_down_write_data_sem(struct inode
*first
,
3245 struct inode
*second
);
3246 extern void ext4_double_up_write_data_sem(struct inode
*orig_inode
,
3247 struct inode
*donor_inode
);
3248 extern int ext4_move_extents(struct file
*o_filp
, struct file
*d_filp
,
3249 __u64 start_orig
, __u64 start_donor
,
3250 __u64 len
, __u64
*moved_len
);
3253 extern int __init
ext4_init_pageio(void);
3254 extern void ext4_exit_pageio(void);
3255 extern ext4_io_end_t
*ext4_init_io_end(struct inode
*inode
, gfp_t flags
);
3256 extern ext4_io_end_t
*ext4_get_io_end(ext4_io_end_t
*io_end
);
3257 extern int ext4_put_io_end(ext4_io_end_t
*io_end
);
3258 extern void ext4_put_io_end_defer(ext4_io_end_t
*io_end
);
3259 extern void ext4_io_submit_init(struct ext4_io_submit
*io
,
3260 struct writeback_control
*wbc
);
3261 extern void ext4_end_io_rsv_work(struct work_struct
*work
);
3262 extern void ext4_io_submit(struct ext4_io_submit
*io
);
3263 extern int ext4_bio_write_page(struct ext4_io_submit
*io
,
3266 struct writeback_control
*wbc
,
3270 extern int ext4_multi_mount_protect(struct super_block
*, ext4_fsblk_t
);
3273 * Add new method to test whether block and inode bitmaps are properly
3274 * initialized. With uninit_bg reading the block from disk is not enough
3275 * to mark the bitmap uptodate. We need to also zero-out the bitmap
3277 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
3279 static inline int bitmap_uptodate(struct buffer_head
*bh
)
3281 return (buffer_uptodate(bh
) &&
3282 test_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
));
3284 static inline void set_bitmap_uptodate(struct buffer_head
*bh
)
3286 set_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
);
3290 * Disable DIO read nolock optimization, so new dioreaders will be forced
3293 static inline void ext4_inode_block_unlocked_dio(struct inode
*inode
)
3295 ext4_set_inode_state(inode
, EXT4_STATE_DIOREAD_LOCK
);
3298 static inline void ext4_inode_resume_unlocked_dio(struct inode
*inode
)
3301 ext4_clear_inode_state(inode
, EXT4_STATE_DIOREAD_LOCK
);
3304 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
3306 /* For ioend & aio unwritten conversion wait queues */
3307 #define EXT4_WQ_HASH_SZ 37
3308 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
3310 extern wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
3312 #define EXT4_RESIZING 0
3313 extern int ext4_resize_begin(struct super_block
*sb
);
3314 extern void ext4_resize_end(struct super_block
*sb
);
3316 static inline void ext4_set_io_unwritten_flag(struct inode
*inode
,
3317 struct ext4_io_end
*io_end
)
3319 if (!(io_end
->flag
& EXT4_IO_END_UNWRITTEN
)) {
3320 io_end
->flag
|= EXT4_IO_END_UNWRITTEN
;
3321 atomic_inc(&EXT4_I(inode
)->i_unwritten
);
3325 static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t
*io_end
)
3327 struct inode
*inode
= io_end
->inode
;
3329 if (io_end
->flag
& EXT4_IO_END_UNWRITTEN
) {
3330 io_end
->flag
&= ~EXT4_IO_END_UNWRITTEN
;
3331 /* Wake up anyone waiting on unwritten extent conversion */
3332 if (atomic_dec_and_test(&EXT4_I(inode
)->i_unwritten
))
3333 wake_up_all(ext4_ioend_wq(inode
));
3337 static inline bool ext4_aligned_io(struct inode
*inode
, loff_t off
, loff_t len
)
3339 int blksize
= 1 << inode
->i_blkbits
;
3341 return IS_ALIGNED(off
, blksize
) && IS_ALIGNED(len
, blksize
);
3344 #endif /* __KERNEL__ */
3346 #define EFSBADCRC EBADMSG /* Bad CRC detected */
3347 #define EFSCORRUPTED EUCLEAN /* Filesystem is corrupted */
3349 #endif /* _EXT4_H */