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/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <crypto/hash.h>
34 #include <linux/compat.h>
38 * The fourth extended filesystem constants/structures
42 * Define EXT4FS_DEBUG to produce debug messages
50 #define ext4_debug(f, a...) \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
61 * Turn on EXT_DEBUG to get lots of info about extents operations.
65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
70 #define EXT4_ERROR_INODE(inode, fmt, a...) \
71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
79 /* data type for block offset of block group */
80 typedef int ext4_grpblk_t
;
82 /* data type for filesystem-wide blocks number */
83 typedef unsigned long long ext4_fsblk_t
;
85 /* data type for file logical block number */
86 typedef __u32 ext4_lblk_t
;
88 /* data type for block group number */
89 typedef unsigned int ext4_group_t
;
92 * Flags used in mballoc's allocation_context flags field.
94 * Also used to show what's going on for debugging purposes when the
95 * flag field is exported via the traceport interface
98 /* prefer goal again. length */
99 #define EXT4_MB_HINT_MERGE 0x0001
100 /* blocks already reserved */
101 #define EXT4_MB_HINT_RESERVED 0x0002
102 /* metadata is being allocated */
103 #define EXT4_MB_HINT_METADATA 0x0004
104 /* first blocks in the file */
105 #define EXT4_MB_HINT_FIRST 0x0008
106 /* search for the best chunk */
107 #define EXT4_MB_HINT_BEST 0x0010
108 /* data is being allocated */
109 #define EXT4_MB_HINT_DATA 0x0020
110 /* don't preallocate (for tails) */
111 #define EXT4_MB_HINT_NOPREALLOC 0x0040
112 /* allocate for locality group */
113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
114 /* allocate goal blocks or none */
115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
116 /* goal is meaningful */
117 #define EXT4_MB_HINT_TRY_GOAL 0x0200
118 /* blocks already pre-reserved by delayed allocation */
119 #define EXT4_MB_DELALLOC_RESERVED 0x0400
120 /* We are doing stream allocation */
121 #define EXT4_MB_STREAM_ALLOC 0x0800
122 /* Use reserved root blocks if needed */
123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
124 /* Use blocks from reserved pool */
125 #define EXT4_MB_USE_RESERVED 0x2000
127 struct ext4_allocation_request
{
128 /* target inode for block we're allocating */
130 /* how many blocks we want to allocate */
132 /* logical block in target inode */
134 /* the closest logical allocated block to the left */
136 /* the closest logical allocated block to the right */
138 /* phys. target (a hint) */
140 /* phys. block for the closest logical allocated block to the left */
142 /* phys. block for the closest logical allocated block to the right */
144 /* flags. see above EXT4_MB_HINT_* */
149 * Logical to physical block mapping, used by ext4_map_blocks()
151 * This structure is used to pass requests into ext4_map_blocks() as
152 * well as to store the information returned by ext4_map_blocks(). It
153 * takes less room on the stack than a struct buffer_head.
155 #define EXT4_MAP_NEW (1 << BH_New)
156 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
157 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
158 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
159 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
160 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
161 * ext4_map_blocks wants to know whether or not the underlying cluster has
162 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
163 * the requested mapping was from previously mapped (or delayed allocated)
164 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
165 * should never appear on buffer_head's state flags.
167 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
168 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
169 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
170 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
172 struct ext4_map_blocks
{
176 unsigned int m_flags
;
180 * Flags for ext4_io_end->flags
182 #define EXT4_IO_END_UNWRITTEN 0x0001
183 #define EXT4_IO_END_ERROR 0x0002
184 #define EXT4_IO_END_DIRECT 0x0004
187 * For converting uninitialized extents on a work queue.
189 typedef struct ext4_io_end
{
190 struct list_head list
; /* per-file finished IO list */
191 struct inode
*inode
; /* file being written to */
192 unsigned int flag
; /* unwritten or not */
193 loff_t offset
; /* offset in the file */
194 ssize_t size
; /* size of the extent */
195 struct kiocb
*iocb
; /* iocb struct for AIO */
196 int result
; /* error value for AIO */
197 atomic_t count
; /* reference counter */
200 struct ext4_io_submit
{
203 ext4_io_end_t
*io_end
;
204 sector_t io_next_block
;
208 * Special inodes numbers
210 #define EXT4_BAD_INO 1 /* Bad blocks inode */
211 #define EXT4_ROOT_INO 2 /* Root inode */
212 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
213 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
214 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
215 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
216 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
217 #define EXT4_JOURNAL_INO 8 /* Journal inode */
219 /* First non-reserved inode for old ext4 filesystems */
220 #define EXT4_GOOD_OLD_FIRST_INO 11
223 * Maximal count of links to a file
225 #define EXT4_LINK_MAX 65000
228 * Macro-instructions used to manage several block sizes
230 #define EXT4_MIN_BLOCK_SIZE 1024
231 #define EXT4_MAX_BLOCK_SIZE 65536
232 #define EXT4_MIN_BLOCK_LOG_SIZE 10
233 #define EXT4_MAX_BLOCK_LOG_SIZE 16
235 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
237 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
239 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
240 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
241 EXT4_SB(s)->s_cluster_bits)
243 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
244 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
246 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
249 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
250 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
251 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
253 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
254 EXT4_GOOD_OLD_INODE_SIZE : \
256 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
257 EXT4_GOOD_OLD_FIRST_INO : \
260 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
262 /* Translate a block number to a cluster number */
263 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
264 /* Translate a cluster number to a block number */
265 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
266 /* Translate # of blks to # of clusters */
267 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
268 (sbi)->s_cluster_bits)
271 * Structure of a blocks group descriptor
273 struct ext4_group_desc
275 __le32 bg_block_bitmap_lo
; /* Blocks bitmap block */
276 __le32 bg_inode_bitmap_lo
; /* Inodes bitmap block */
277 __le32 bg_inode_table_lo
; /* Inodes table block */
278 __le16 bg_free_blocks_count_lo
;/* Free blocks count */
279 __le16 bg_free_inodes_count_lo
;/* Free inodes count */
280 __le16 bg_used_dirs_count_lo
; /* Directories count */
281 __le16 bg_flags
; /* EXT4_BG_flags (INODE_UNINIT, etc) */
282 __le32 bg_exclude_bitmap_lo
; /* Exclude bitmap for snapshots */
283 __le16 bg_block_bitmap_csum_lo
;/* crc32c(s_uuid+grp_num+bbitmap) LE */
284 __le16 bg_inode_bitmap_csum_lo
;/* crc32c(s_uuid+grp_num+ibitmap) LE */
285 __le16 bg_itable_unused_lo
; /* Unused inodes count */
286 __le16 bg_checksum
; /* crc16(sb_uuid+group+desc) */
287 __le32 bg_block_bitmap_hi
; /* Blocks bitmap block MSB */
288 __le32 bg_inode_bitmap_hi
; /* Inodes bitmap block MSB */
289 __le32 bg_inode_table_hi
; /* Inodes table block MSB */
290 __le16 bg_free_blocks_count_hi
;/* Free blocks count MSB */
291 __le16 bg_free_inodes_count_hi
;/* Free inodes count MSB */
292 __le16 bg_used_dirs_count_hi
; /* Directories count MSB */
293 __le16 bg_itable_unused_hi
; /* Unused inodes count MSB */
294 __le32 bg_exclude_bitmap_hi
; /* Exclude bitmap block MSB */
295 __le16 bg_block_bitmap_csum_hi
;/* crc32c(s_uuid+grp_num+bbitmap) BE */
296 __le16 bg_inode_bitmap_csum_hi
;/* crc32c(s_uuid+grp_num+ibitmap) BE */
300 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
301 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
303 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
304 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
308 * Structure of a flex block group info
312 atomic64_t free_clusters
;
313 atomic_t free_inodes
;
317 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
318 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
319 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
322 * Macro-instructions used to manage group descriptors
324 #define EXT4_MIN_DESC_SIZE 32
325 #define EXT4_MIN_DESC_SIZE_64BIT 64
326 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
327 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
329 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
330 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
331 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
332 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
333 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
335 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
336 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
337 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
341 * Constants relative to the data blocks
343 #define EXT4_NDIR_BLOCKS 12
344 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
345 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
346 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
347 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
352 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
353 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
354 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
355 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
356 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
357 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
358 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
359 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
360 /* Reserved for compression usage... */
361 #define EXT4_DIRTY_FL 0x00000100
362 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
363 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
364 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
365 /* End compression flags --- maybe not all used */
366 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
367 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
368 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
369 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
370 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
371 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
372 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
373 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
374 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
375 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
376 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
377 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
379 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
380 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
382 /* Flags that should be inherited by new inodes from their parent. */
383 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
384 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
385 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
386 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
388 /* Flags that are appropriate for regular files (all but dir-specific ones). */
389 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
391 /* Flags that are appropriate for non-directories/regular files. */
392 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
394 /* Mask out flags that are inappropriate for the given type of inode. */
395 static inline __u32
ext4_mask_flags(umode_t mode
, __u32 flags
)
399 else if (S_ISREG(mode
))
400 return flags
& EXT4_REG_FLMASK
;
402 return flags
& EXT4_OTHER_FLMASK
;
406 * Inode flags used for atomic set/get
409 EXT4_INODE_SECRM
= 0, /* Secure deletion */
410 EXT4_INODE_UNRM
= 1, /* Undelete */
411 EXT4_INODE_COMPR
= 2, /* Compress file */
412 EXT4_INODE_SYNC
= 3, /* Synchronous updates */
413 EXT4_INODE_IMMUTABLE
= 4, /* Immutable file */
414 EXT4_INODE_APPEND
= 5, /* writes to file may only append */
415 EXT4_INODE_NODUMP
= 6, /* do not dump file */
416 EXT4_INODE_NOATIME
= 7, /* do not update atime */
417 /* Reserved for compression usage... */
418 EXT4_INODE_DIRTY
= 8,
419 EXT4_INODE_COMPRBLK
= 9, /* One or more compressed clusters */
420 EXT4_INODE_NOCOMPR
= 10, /* Don't compress */
421 EXT4_INODE_ECOMPR
= 11, /* Compression error */
422 /* End compression flags --- maybe not all used */
423 EXT4_INODE_INDEX
= 12, /* hash-indexed directory */
424 EXT4_INODE_IMAGIC
= 13, /* AFS directory */
425 EXT4_INODE_JOURNAL_DATA
= 14, /* file data should be journaled */
426 EXT4_INODE_NOTAIL
= 15, /* file tail should not be merged */
427 EXT4_INODE_DIRSYNC
= 16, /* dirsync behaviour (directories only) */
428 EXT4_INODE_TOPDIR
= 17, /* Top of directory hierarchies*/
429 EXT4_INODE_HUGE_FILE
= 18, /* Set to each huge file */
430 EXT4_INODE_EXTENTS
= 19, /* Inode uses extents */
431 EXT4_INODE_EA_INODE
= 21, /* Inode used for large EA */
432 EXT4_INODE_EOFBLOCKS
= 22, /* Blocks allocated beyond EOF */
433 EXT4_INODE_INLINE_DATA
= 28, /* Data in inode. */
434 EXT4_INODE_RESERVED
= 31, /* reserved for ext4 lib */
438 * Since it's pretty easy to mix up bit numbers and hex values, we use a
439 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
440 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
441 * any extra space in the compiled kernel image, otherwise, the build will fail.
442 * It's important that these values are the same, since we are using
443 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
444 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
445 * values found in ext2, ext3 and ext4 filesystems, and of course the values
446 * defined in e2fsprogs.
448 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
450 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
451 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
453 static inline void ext4_check_flag_values(void)
455 CHECK_FLAG_VALUE(SECRM
);
456 CHECK_FLAG_VALUE(UNRM
);
457 CHECK_FLAG_VALUE(COMPR
);
458 CHECK_FLAG_VALUE(SYNC
);
459 CHECK_FLAG_VALUE(IMMUTABLE
);
460 CHECK_FLAG_VALUE(APPEND
);
461 CHECK_FLAG_VALUE(NODUMP
);
462 CHECK_FLAG_VALUE(NOATIME
);
463 CHECK_FLAG_VALUE(DIRTY
);
464 CHECK_FLAG_VALUE(COMPRBLK
);
465 CHECK_FLAG_VALUE(NOCOMPR
);
466 CHECK_FLAG_VALUE(ECOMPR
);
467 CHECK_FLAG_VALUE(INDEX
);
468 CHECK_FLAG_VALUE(IMAGIC
);
469 CHECK_FLAG_VALUE(JOURNAL_DATA
);
470 CHECK_FLAG_VALUE(NOTAIL
);
471 CHECK_FLAG_VALUE(DIRSYNC
);
472 CHECK_FLAG_VALUE(TOPDIR
);
473 CHECK_FLAG_VALUE(HUGE_FILE
);
474 CHECK_FLAG_VALUE(EXTENTS
);
475 CHECK_FLAG_VALUE(EA_INODE
);
476 CHECK_FLAG_VALUE(EOFBLOCKS
);
477 CHECK_FLAG_VALUE(INLINE_DATA
);
478 CHECK_FLAG_VALUE(RESERVED
);
481 /* Used to pass group descriptor data when online resize is done */
482 struct ext4_new_group_input
{
483 __u32 group
; /* Group number for this data */
484 __u64 block_bitmap
; /* Absolute block number of block bitmap */
485 __u64 inode_bitmap
; /* Absolute block number of inode bitmap */
486 __u64 inode_table
; /* Absolute block number of inode table start */
487 __u32 blocks_count
; /* Total number of blocks in this group */
488 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
492 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
493 struct compat_ext4_new_group_input
{
495 compat_u64 block_bitmap
;
496 compat_u64 inode_bitmap
;
497 compat_u64 inode_table
;
504 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
505 struct ext4_new_group_data
{
511 __u16 reserved_blocks
;
513 __u32 free_blocks_count
;
516 /* Indexes used to index group tables in ext4_new_group_data */
518 BLOCK_BITMAP
= 0, /* block bitmap */
519 INODE_BITMAP
, /* inode bitmap */
520 INODE_TABLE
, /* inode tables */
525 * Flags used by ext4_map_blocks()
527 /* Allocate any needed blocks and/or convert an unitialized
528 extent to be an initialized ext4 */
529 #define EXT4_GET_BLOCKS_CREATE 0x0001
530 /* Request the creation of an unitialized extent */
531 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
532 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
533 EXT4_GET_BLOCKS_CREATE)
534 /* Caller is from the delayed allocation writeout path
535 * finally doing the actual allocation of delayed blocks */
536 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
537 /* caller is from the direct IO path, request to creation of an
538 unitialized extents if not allocated, split the uninitialized
539 extent if blocks has been preallocated already*/
540 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
541 #define EXT4_GET_BLOCKS_CONVERT 0x0010
542 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
543 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
544 /* Convert extent to initialized after IO complete */
545 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
546 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
547 /* Eventual metadata allocation (due to growing extent tree)
548 * should not fail, so try to use reserved blocks for that.*/
549 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
550 /* Don't normalize allocation size (used for fallocate) */
551 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
552 /* Request will not result in inode size update (user for fallocate) */
553 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
554 /* Do not take i_data_sem locking in ext4_map_blocks */
555 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
556 /* Do not put hole in extent cache */
557 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
560 * Flags used by ext4_free_blocks
562 #define EXT4_FREE_BLOCKS_METADATA 0x0001
563 #define EXT4_FREE_BLOCKS_FORGET 0x0002
564 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
565 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
566 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
567 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
572 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
573 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
574 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
575 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
576 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
577 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
578 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
579 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
580 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
581 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
582 #define EXT4_IOC_MIGRATE _IO('f', 9)
583 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
584 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
585 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
586 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
587 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
588 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
590 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
592 * ioctl commands in 32 bit emulation
594 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
595 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
596 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
597 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
598 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
599 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
600 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
601 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
602 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
603 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
606 /* Max physical block we can address w/o extents */
607 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
610 * Structure of an inode on the disk
613 __le16 i_mode
; /* File mode */
614 __le16 i_uid
; /* Low 16 bits of Owner Uid */
615 __le32 i_size_lo
; /* Size in bytes */
616 __le32 i_atime
; /* Access time */
617 __le32 i_ctime
; /* Inode Change time */
618 __le32 i_mtime
; /* Modification time */
619 __le32 i_dtime
; /* Deletion Time */
620 __le16 i_gid
; /* Low 16 bits of Group Id */
621 __le16 i_links_count
; /* Links count */
622 __le32 i_blocks_lo
; /* Blocks count */
623 __le32 i_flags
; /* File flags */
629 __u32 h_i_translator
;
634 } osd1
; /* OS dependent 1 */
635 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
636 __le32 i_generation
; /* File version (for NFS) */
637 __le32 i_file_acl_lo
; /* File ACL */
639 __le32 i_obso_faddr
; /* Obsoleted fragment address */
642 __le16 l_i_blocks_high
; /* were l_i_reserved1 */
643 __le16 l_i_file_acl_high
;
644 __le16 l_i_uid_high
; /* these 2 fields */
645 __le16 l_i_gid_high
; /* were reserved2[0] */
646 __le16 l_i_checksum_lo
;/* crc32c(uuid+inum+inode) LE */
650 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
657 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
658 __le16 m_i_file_acl_high
;
659 __u32 m_i_reserved2
[2];
661 } osd2
; /* OS dependent 2 */
662 __le16 i_extra_isize
;
663 __le16 i_checksum_hi
; /* crc32c(uuid+inum+inode) BE */
664 __le32 i_ctime_extra
; /* extra Change time (nsec << 2 | epoch) */
665 __le32 i_mtime_extra
; /* extra Modification time(nsec << 2 | epoch) */
666 __le32 i_atime_extra
; /* extra Access time (nsec << 2 | epoch) */
667 __le32 i_crtime
; /* File Creation time */
668 __le32 i_crtime_extra
; /* extra FileCreationtime (nsec << 2 | epoch) */
669 __le32 i_version_hi
; /* high 32 bits for 64-bit version */
673 __u32 reserved
; /* should be zero */
674 __u32 donor_fd
; /* donor file descriptor */
675 __u64 orig_start
; /* logical start offset in block for orig */
676 __u64 donor_start
; /* logical start offset in block for donor */
677 __u64 len
; /* block length to be moved */
678 __u64 moved_len
; /* moved block length */
681 #define EXT4_EPOCH_BITS 2
682 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
683 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
686 * Extended fields will fit into an inode if the filesystem was formatted
687 * with large inodes (-I 256 or larger) and there are not currently any EAs
688 * consuming all of the available space. For new inodes we always reserve
689 * enough space for the kernel's known extended fields, but for inodes
690 * created with an old kernel this might not have been the case. None of
691 * the extended inode fields is critical for correct filesystem operation.
692 * This macro checks if a certain field fits in the inode. Note that
693 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
695 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
696 ((offsetof(typeof(*ext4_inode), field) + \
697 sizeof((ext4_inode)->field)) \
698 <= (EXT4_GOOD_OLD_INODE_SIZE + \
699 (einode)->i_extra_isize)) \
701 static inline __le32 ext4_encode_extra_time(struct timespec *time)
703 return cpu_to_le32((sizeof(time
->tv_sec
) > 4 ?
704 (time
->tv_sec
>> 32) & EXT4_EPOCH_MASK
: 0) |
705 ((time
->tv_nsec
<< EXT4_EPOCH_BITS
) & EXT4_NSEC_MASK
));
708 static inline void ext4_decode_extra_time(struct timespec
*time
, __le32 extra
)
710 if (sizeof(time
->tv_sec
) > 4)
711 time
->tv_sec
|= (__u64
)(le32_to_cpu(extra
) & EXT4_EPOCH_MASK
)
713 time
->tv_nsec
= (le32_to_cpu(extra
) & EXT4_NSEC_MASK
) >> EXT4_EPOCH_BITS
;
716 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
718 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
719 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
720 (raw_inode)->xtime ## _extra = \
721 ext4_encode_extra_time(&(inode)->xtime); \
724 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
726 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
727 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
728 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
729 (raw_inode)->xtime ## _extra = \
730 ext4_encode_extra_time(&(einode)->xtime); \
733 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
735 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
736 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
737 ext4_decode_extra_time(&(inode)->xtime, \
738 raw_inode->xtime ## _extra); \
740 (inode)->xtime.tv_nsec = 0; \
743 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
745 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
746 (einode)->xtime.tv_sec = \
747 (signed)le32_to_cpu((raw_inode)->xtime); \
748 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
749 ext4_decode_extra_time(&(einode)->xtime, \
750 raw_inode->xtime ## _extra); \
752 (einode)->xtime.tv_nsec = 0; \
755 #define i_disk_version osd1.linux1.l_i_version
757 #if defined(__KERNEL__) || defined(__linux__)
758 #define i_reserved1 osd1.linux1.l_i_reserved1
759 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
760 #define i_blocks_high osd2.linux2.l_i_blocks_high
761 #define i_uid_low i_uid
762 #define i_gid_low i_gid
763 #define i_uid_high osd2.linux2.l_i_uid_high
764 #define i_gid_high osd2.linux2.l_i_gid_high
765 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
767 #elif defined(__GNU__)
769 #define i_translator osd1.hurd1.h_i_translator
770 #define i_uid_high osd2.hurd2.h_i_uid_high
771 #define i_gid_high osd2.hurd2.h_i_gid_high
772 #define i_author osd2.hurd2.h_i_author
774 #elif defined(__masix__)
776 #define i_reserved1 osd1.masix1.m_i_reserved1
777 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
778 #define i_reserved2 osd2.masix2.m_i_reserved2
780 #endif /* defined(__KERNEL__) || defined(__linux__) */
782 #include "extents_status.h"
785 * fourth extended file system inode data in memory
787 struct ext4_inode_info
{
788 __le32 i_data
[15]; /* unconverted */
790 ext4_fsblk_t i_file_acl
;
793 * i_block_group is the number of the block group which contains
794 * this file's inode. Constant across the lifetime of the inode,
795 * it is ued for making block allocation decisions - we try to
796 * place a file's data blocks near its inode block, and new inodes
797 * near to their parent directory's inode.
799 ext4_group_t i_block_group
;
800 ext4_lblk_t i_dir_start_lookup
;
801 #if (BITS_PER_LONG < 64)
802 unsigned long i_state_flags
; /* Dynamic state flags */
804 unsigned long i_flags
;
807 * Extended attributes can be read independently of the main file
808 * data. Taking i_mutex even when reading would cause contention
809 * between readers of EAs and writers of regular file data, so
810 * instead we synchronize on xattr_sem when reading or changing
813 struct rw_semaphore xattr_sem
;
815 struct list_head i_orphan
; /* unlinked but open inodes */
818 * i_disksize keeps track of what the inode size is ON DISK, not
819 * in memory. During truncate, i_size is set to the new size by
820 * the VFS prior to calling ext4_truncate(), but the filesystem won't
821 * set i_disksize to 0 until the truncate is actually under way.
823 * The intent is that i_disksize always represents the blocks which
824 * are used by this file. This allows recovery to restart truncate
825 * on orphans if we crash during truncate. We actually write i_disksize
826 * into the on-disk inode when writing inodes out, instead of i_size.
828 * The only time when i_disksize and i_size may be different is when
829 * a truncate is in progress. The only things which change i_disksize
830 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
835 * i_data_sem is for serialising ext4_truncate() against
836 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
837 * data tree are chopped off during truncate. We can't do that in
838 * ext4 because whenever we perform intermediate commits during
839 * truncate, the inode and all the metadata blocks *must* be in a
840 * consistent state which allows truncation of the orphans to restart
841 * during recovery. Hence we must fix the get_block-vs-truncate race
842 * by other means, so we have i_data_sem.
844 struct rw_semaphore i_data_sem
;
845 struct inode vfs_inode
;
846 struct jbd2_inode
*jinode
;
849 * File creation time. Its function is same as that of
850 * struct timespec i_{a,c,m}time in the generic inode.
852 struct timespec i_crtime
;
855 struct list_head i_prealloc_list
;
856 spinlock_t i_prealloc_lock
;
858 /* extents status tree */
859 struct ext4_es_tree i_es_tree
;
861 struct list_head i_es_lru
;
862 unsigned int i_es_lru_nr
; /* protected by i_es_lock */
865 ext4_group_t i_last_alloc_group
;
867 /* allocation reservation info for delalloc */
868 /* In case of bigalloc, these refer to clusters rather than blocks */
869 unsigned int i_reserved_data_blocks
;
870 unsigned int i_reserved_meta_blocks
;
871 unsigned int i_allocated_meta_blocks
;
872 ext4_lblk_t i_da_metadata_calc_last_lblock
;
873 int i_da_metadata_calc_len
;
875 /* on-disk additional length */
878 /* Indicate the inline data space. */
883 /* quota space reservation, managed internally by quota code */
884 qsize_t i_reserved_quota
;
887 /* completed IOs that might need unwritten extents handling */
888 struct list_head i_completed_io_list
;
889 spinlock_t i_completed_io_lock
;
890 atomic_t i_ioend_count
; /* Number of outstanding io_end structs */
891 atomic_t i_unwritten
; /* Nr. of inflight conversions pending */
892 struct work_struct i_unwritten_work
; /* deferred extent conversion */
894 spinlock_t i_block_reservation_lock
;
897 * Transactions that contain inode's metadata needed to complete
898 * fsync and fdatasync, respectively.
901 tid_t i_datasync_tid
;
903 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
910 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
911 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
912 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
915 * Misc. filesystem flags
917 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
918 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
919 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
922 * Mount flags set via mount options or defaults
924 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
925 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
926 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
927 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
928 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
929 #define EXT4_MOUNT_ERRORS_MASK 0x00070
930 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
931 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
932 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
933 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
934 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
935 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
936 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
937 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
938 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
939 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
940 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
941 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
942 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
943 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
944 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
945 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
946 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
947 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
948 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
949 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
950 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
951 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
952 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
955 * Mount flags set either automatically (could not be set by mount option)
956 * based on per file system feature or property or in special cases such as
957 * distinguishing between explicit mount option definition and default.
959 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
960 specified delalloc */
961 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
962 size of blocksize * 8
965 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
967 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
969 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
972 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
974 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
976 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
979 #define ext4_test_and_set_bit __test_and_set_bit_le
980 #define ext4_set_bit __set_bit_le
981 #define ext4_set_bit_atomic ext2_set_bit_atomic
982 #define ext4_test_and_clear_bit __test_and_clear_bit_le
983 #define ext4_clear_bit __clear_bit_le
984 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
985 #define ext4_test_bit test_bit_le
986 #define ext4_find_next_zero_bit find_next_zero_bit_le
987 #define ext4_find_next_bit find_next_bit_le
989 extern void ext4_set_bits(void *bm
, int cur
, int len
);
992 * Maximal mount counts between two filesystem checks
994 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
995 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
998 * Behaviour when detecting errors
1000 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1001 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1002 #define EXT4_ERRORS_PANIC 3 /* Panic */
1003 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1005 /* Metadata checksum algorithm codes */
1006 #define EXT4_CRC32C_CHKSUM 1
1009 * Structure of the super block
1011 struct ext4_super_block
{
1012 /*00*/ __le32 s_inodes_count
; /* Inodes count */
1013 __le32 s_blocks_count_lo
; /* Blocks count */
1014 __le32 s_r_blocks_count_lo
; /* Reserved blocks count */
1015 __le32 s_free_blocks_count_lo
; /* Free blocks count */
1016 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
1017 __le32 s_first_data_block
; /* First Data Block */
1018 __le32 s_log_block_size
; /* Block size */
1019 __le32 s_log_cluster_size
; /* Allocation cluster size */
1020 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
1021 __le32 s_clusters_per_group
; /* # Clusters per group */
1022 __le32 s_inodes_per_group
; /* # Inodes per group */
1023 __le32 s_mtime
; /* Mount time */
1024 /*30*/ __le32 s_wtime
; /* Write time */
1025 __le16 s_mnt_count
; /* Mount count */
1026 __le16 s_max_mnt_count
; /* Maximal mount count */
1027 __le16 s_magic
; /* Magic signature */
1028 __le16 s_state
; /* File system state */
1029 __le16 s_errors
; /* Behaviour when detecting errors */
1030 __le16 s_minor_rev_level
; /* minor revision level */
1031 /*40*/ __le32 s_lastcheck
; /* time of last check */
1032 __le32 s_checkinterval
; /* max. time between checks */
1033 __le32 s_creator_os
; /* OS */
1034 __le32 s_rev_level
; /* Revision level */
1035 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
1036 __le16 s_def_resgid
; /* Default gid for reserved blocks */
1038 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1040 * Note: the difference between the compatible feature set and
1041 * the incompatible feature set is that if there is a bit set
1042 * in the incompatible feature set that the kernel doesn't
1043 * know about, it should refuse to mount the filesystem.
1045 * e2fsck's requirements are more strict; if it doesn't know
1046 * about a feature in either the compatible or incompatible
1047 * feature set, it must abort and not try to meddle with
1048 * things it doesn't understand...
1050 __le32 s_first_ino
; /* First non-reserved inode */
1051 __le16 s_inode_size
; /* size of inode structure */
1052 __le16 s_block_group_nr
; /* block group # of this superblock */
1053 __le32 s_feature_compat
; /* compatible feature set */
1054 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
1055 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
1056 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
1057 /*78*/ char s_volume_name
[16]; /* volume name */
1058 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
1059 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
1061 * Performance hints. Directory preallocation should only
1062 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1064 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
1065 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
1066 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
1068 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1070 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
1071 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
1072 __le32 s_journal_dev
; /* device number of journal file */
1073 __le32 s_last_orphan
; /* start of list of inodes to delete */
1074 __le32 s_hash_seed
[4]; /* HTREE hash seed */
1075 __u8 s_def_hash_version
; /* Default hash version to use */
1076 __u8 s_jnl_backup_type
;
1077 __le16 s_desc_size
; /* size of group descriptor */
1078 /*100*/ __le32 s_default_mount_opts
;
1079 __le32 s_first_meta_bg
; /* First metablock block group */
1080 __le32 s_mkfs_time
; /* When the filesystem was created */
1081 __le32 s_jnl_blocks
[17]; /* Backup of the journal inode */
1082 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1083 /*150*/ __le32 s_blocks_count_hi
; /* Blocks count */
1084 __le32 s_r_blocks_count_hi
; /* Reserved blocks count */
1085 __le32 s_free_blocks_count_hi
; /* Free blocks count */
1086 __le16 s_min_extra_isize
; /* All inodes have at least # bytes */
1087 __le16 s_want_extra_isize
; /* New inodes should reserve # bytes */
1088 __le32 s_flags
; /* Miscellaneous flags */
1089 __le16 s_raid_stride
; /* RAID stride */
1090 __le16 s_mmp_update_interval
; /* # seconds to wait in MMP checking */
1091 __le64 s_mmp_block
; /* Block for multi-mount protection */
1092 __le32 s_raid_stripe_width
; /* blocks on all data disks (N*stride)*/
1093 __u8 s_log_groups_per_flex
; /* FLEX_BG group size */
1094 __u8 s_checksum_type
; /* metadata checksum algorithm used */
1095 __le16 s_reserved_pad
;
1096 __le64 s_kbytes_written
; /* nr of lifetime kilobytes written */
1097 __le32 s_snapshot_inum
; /* Inode number of active snapshot */
1098 __le32 s_snapshot_id
; /* sequential ID of active snapshot */
1099 __le64 s_snapshot_r_blocks_count
; /* reserved blocks for active
1100 snapshot's future use */
1101 __le32 s_snapshot_list
; /* inode number of the head of the
1102 on-disk snapshot list */
1103 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1104 __le32 s_error_count
; /* number of fs errors */
1105 __le32 s_first_error_time
; /* first time an error happened */
1106 __le32 s_first_error_ino
; /* inode involved in first error */
1107 __le64 s_first_error_block
; /* block involved of first error */
1108 __u8 s_first_error_func
[32]; /* function where the error happened */
1109 __le32 s_first_error_line
; /* line number where error happened */
1110 __le32 s_last_error_time
; /* most recent time of an error */
1111 __le32 s_last_error_ino
; /* inode involved in last error */
1112 __le32 s_last_error_line
; /* line number where error happened */
1113 __le64 s_last_error_block
; /* block involved of last error */
1114 __u8 s_last_error_func
[32]; /* function where the error happened */
1115 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1116 __u8 s_mount_opts
[64];
1117 __le32 s_usr_quota_inum
; /* inode for tracking user quota */
1118 __le32 s_grp_quota_inum
; /* inode for tracking group quota */
1119 __le32 s_overhead_clusters
; /* overhead blocks/clusters in fs */
1120 __le32 s_reserved
[108]; /* Padding to the end of the block */
1121 __le32 s_checksum
; /* crc32c(superblock) */
1124 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1129 * run-time mount flags
1131 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1132 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1135 * fourth extended-fs super-block data in memory
1137 struct ext4_sb_info
{
1138 unsigned long s_desc_size
; /* Size of a group descriptor in bytes */
1139 unsigned long s_inodes_per_block
;/* Number of inodes per block */
1140 unsigned long s_blocks_per_group
;/* Number of blocks in a group */
1141 unsigned long s_clusters_per_group
; /* Number of clusters in a group */
1142 unsigned long s_inodes_per_group
;/* Number of inodes in a group */
1143 unsigned long s_itb_per_group
; /* Number of inode table blocks per group */
1144 unsigned long s_gdb_count
; /* Number of group descriptor blocks */
1145 unsigned long s_desc_per_block
; /* Number of group descriptors per block */
1146 ext4_group_t s_groups_count
; /* Number of groups in the fs */
1147 ext4_group_t s_blockfile_groups
;/* Groups acceptable for non-extent files */
1148 unsigned long s_overhead
; /* # of fs overhead clusters */
1149 unsigned int s_cluster_ratio
; /* Number of blocks per cluster */
1150 unsigned int s_cluster_bits
; /* log2 of s_cluster_ratio */
1151 loff_t s_bitmap_maxbytes
; /* max bytes for bitmap files */
1152 struct buffer_head
* s_sbh
; /* Buffer containing the super block */
1153 struct ext4_super_block
*s_es
; /* Pointer to the super block in the buffer */
1154 struct buffer_head
**s_group_desc
;
1155 unsigned int s_mount_opt
;
1156 unsigned int s_mount_opt2
;
1157 unsigned int s_mount_flags
;
1158 unsigned int s_def_mount_opt
;
1159 ext4_fsblk_t s_sb_block
;
1160 atomic64_t s_resv_clusters
;
1163 unsigned short s_mount_state
;
1164 unsigned short s_pad
;
1165 int s_addr_per_block_bits
;
1166 int s_desc_per_block_bits
;
1169 unsigned int s_inode_readahead_blks
;
1170 unsigned int s_inode_goal
;
1171 spinlock_t s_next_gen_lock
;
1172 u32 s_next_generation
;
1174 int s_def_hash_version
;
1175 int s_hash_unsigned
; /* 3 if hash should be signed, 0 if not */
1176 struct percpu_counter s_freeclusters_counter
;
1177 struct percpu_counter s_freeinodes_counter
;
1178 struct percpu_counter s_dirs_counter
;
1179 struct percpu_counter s_dirtyclusters_counter
;
1180 struct blockgroup_lock
*s_blockgroup_lock
;
1181 struct proc_dir_entry
*s_proc
;
1182 struct kobject s_kobj
;
1183 struct completion s_kobj_unregister
;
1184 struct super_block
*s_sb
;
1187 struct journal_s
*s_journal
;
1188 struct list_head s_orphan
;
1189 struct mutex s_orphan_lock
;
1190 unsigned long s_resize_flags
; /* Flags indicating if there
1192 unsigned long s_commit_interval
;
1193 u32 s_max_batch_time
;
1194 u32 s_min_batch_time
;
1195 struct block_device
*journal_bdev
;
1197 char *s_qf_names
[MAXQUOTAS
]; /* Names of quota files with journalled quota */
1198 int s_jquota_fmt
; /* Format of quota to use */
1200 unsigned int s_want_extra_isize
; /* New inodes should reserve # bytes */
1201 struct rb_root system_blks
;
1203 #ifdef EXTENTS_STATS
1204 /* ext4 extents stats */
1205 unsigned long s_ext_min
;
1206 unsigned long s_ext_max
;
1207 unsigned long s_depth_max
;
1208 spinlock_t s_ext_stats_lock
;
1209 unsigned long s_ext_blocks
;
1210 unsigned long s_ext_extents
;
1213 /* for buddy allocator */
1214 struct ext4_group_info
***s_group_info
;
1215 struct inode
*s_buddy_cache
;
1216 spinlock_t s_md_lock
;
1217 unsigned short *s_mb_offsets
;
1218 unsigned int *s_mb_maxs
;
1219 unsigned int s_group_info_size
;
1222 unsigned long s_stripe
;
1223 unsigned int s_mb_stream_request
;
1224 unsigned int s_mb_max_to_scan
;
1225 unsigned int s_mb_min_to_scan
;
1226 unsigned int s_mb_stats
;
1227 unsigned int s_mb_order2_reqs
;
1228 unsigned int s_mb_group_prealloc
;
1229 unsigned int s_max_dir_size_kb
;
1230 /* where last allocation was done - for stream allocation */
1231 unsigned long s_mb_last_group
;
1232 unsigned long s_mb_last_start
;
1234 /* stats for buddy allocator */
1235 atomic_t s_bal_reqs
; /* number of reqs with len > 1 */
1236 atomic_t s_bal_success
; /* we found long enough chunks */
1237 atomic_t s_bal_allocated
; /* in blocks */
1238 atomic_t s_bal_ex_scanned
; /* total extents scanned */
1239 atomic_t s_bal_goals
; /* goal hits */
1240 atomic_t s_bal_breaks
; /* too long searches */
1241 atomic_t s_bal_2orders
; /* 2^order hits */
1242 spinlock_t s_bal_lock
;
1243 unsigned long s_mb_buddies_generated
;
1244 unsigned long long s_mb_generation_time
;
1245 atomic_t s_mb_lost_chunks
;
1246 atomic_t s_mb_preallocated
;
1247 atomic_t s_mb_discarded
;
1248 atomic_t s_lock_busy
;
1250 /* locality groups */
1251 struct ext4_locality_group __percpu
*s_locality_groups
;
1253 /* for write statistics */
1254 unsigned long s_sectors_written_start
;
1255 u64 s_kbytes_written
;
1257 /* the size of zero-out chunk */
1258 unsigned int s_extent_max_zeroout_kb
;
1260 unsigned int s_log_groups_per_flex
;
1261 struct flex_groups
*s_flex_groups
;
1262 ext4_group_t s_flex_groups_allocated
;
1264 /* workqueue for dio unwritten */
1265 struct workqueue_struct
*dio_unwritten_wq
;
1267 /* timer for periodic error stats printing */
1268 struct timer_list s_err_report
;
1270 /* Lazy inode table initialization info */
1271 struct ext4_li_request
*s_li_request
;
1272 /* Wait multiplier for lazy initialization thread */
1273 unsigned int s_li_wait_mult
;
1275 /* Kernel thread for multiple mount protection */
1276 struct task_struct
*s_mmp_tsk
;
1278 /* record the last minlen when FITRIM is called. */
1279 atomic_t s_last_trim_minblks
;
1281 /* Reference to checksum algorithm driver via cryptoapi */
1282 struct crypto_shash
*s_chksum_driver
;
1284 /* Precomputed FS UUID checksum for seeding other checksums */
1287 /* Reclaim extents from extent status tree */
1288 struct shrinker s_es_shrinker
;
1289 struct list_head s_es_lru
;
1290 struct percpu_counter s_extent_cache_cnt
;
1291 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp
;
1294 static inline struct ext4_sb_info
*EXT4_SB(struct super_block
*sb
)
1296 return sb
->s_fs_info
;
1298 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
1300 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
1303 static inline struct timespec
ext4_current_time(struct inode
*inode
)
1305 return (inode
->i_sb
->s_time_gran
< NSEC_PER_SEC
) ?
1306 current_fs_time(inode
->i_sb
) : CURRENT_TIME_SEC
;
1309 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
1311 return ino
== EXT4_ROOT_INO
||
1312 ino
== EXT4_USR_QUOTA_INO
||
1313 ino
== EXT4_GRP_QUOTA_INO
||
1314 ino
== EXT4_BOOT_LOADER_INO
||
1315 ino
== EXT4_JOURNAL_INO
||
1316 ino
== EXT4_RESIZE_INO
||
1317 (ino
>= EXT4_FIRST_INO(sb
) &&
1318 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
1321 static inline void ext4_set_io_unwritten_flag(struct inode
*inode
,
1322 struct ext4_io_end
*io_end
)
1324 if (!(io_end
->flag
& EXT4_IO_END_UNWRITTEN
)) {
1325 io_end
->flag
|= EXT4_IO_END_UNWRITTEN
;
1326 atomic_inc(&EXT4_I(inode
)->i_unwritten
);
1330 static inline ext4_io_end_t
*ext4_inode_aio(struct inode
*inode
)
1332 return inode
->i_private
;
1335 static inline void ext4_inode_aio_set(struct inode
*inode
, ext4_io_end_t
*io
)
1337 inode
->i_private
= io
;
1341 * Inode dynamic state flags
1344 EXT4_STATE_JDATA
, /* journaled data exists */
1345 EXT4_STATE_NEW
, /* inode is newly created */
1346 EXT4_STATE_XATTR
, /* has in-inode xattrs */
1347 EXT4_STATE_NO_EXPAND
, /* No space for expansion */
1348 EXT4_STATE_DA_ALLOC_CLOSE
, /* Alloc DA blks on close */
1349 EXT4_STATE_EXT_MIGRATE
, /* Inode is migrating */
1350 EXT4_STATE_DIO_UNWRITTEN
, /* need convert on dio done*/
1351 EXT4_STATE_NEWENTRY
, /* File just added to dir */
1352 EXT4_STATE_DELALLOC_RESERVED
, /* blks already reserved for delalloc */
1353 EXT4_STATE_DIOREAD_LOCK
, /* Disable support for dio read
1355 EXT4_STATE_MAY_INLINE_DATA
, /* may have in-inode data */
1356 EXT4_STATE_ORDERED_MODE
, /* data=ordered mode */
1359 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1360 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1362 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1364 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1366 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1368 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1370 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1373 EXT4_INODE_BIT_FNS(flag
, flags
, 0)
1374 #if (BITS_PER_LONG < 64)
1375 EXT4_INODE_BIT_FNS(state
, state_flags
, 0)
1377 static inline void ext4_clear_state_flags(struct ext4_inode_info
*ei
)
1379 (ei
)->i_state_flags
= 0;
1382 EXT4_INODE_BIT_FNS(state
, flags
, 32)
1384 static inline void ext4_clear_state_flags(struct ext4_inode_info
*ei
)
1386 /* We depend on the fact that callers will set i_flags */
1390 /* Assume that user mode programs are passing in an ext4fs superblock, not
1391 * a kernel struct super_block. This will allow us to call the feature-test
1392 * macros from user land. */
1393 #define EXT4_SB(sb) (sb)
1396 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1399 * Codes for operating systems
1401 #define EXT4_OS_LINUX 0
1402 #define EXT4_OS_HURD 1
1403 #define EXT4_OS_MASIX 2
1404 #define EXT4_OS_FREEBSD 3
1405 #define EXT4_OS_LITES 4
1410 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1411 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1413 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1414 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1416 #define EXT4_GOOD_OLD_INODE_SIZE 128
1419 * Feature set definitions
1422 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1423 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1424 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1425 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1426 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1427 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1428 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1429 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1430 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1431 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1432 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1433 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1434 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1435 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1436 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1437 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1438 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1439 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1441 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1442 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1443 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1444 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1445 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1446 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1448 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1449 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1450 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1451 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1452 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1453 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1454 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1455 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1456 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1458 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1459 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1460 * all other data structures' checksums. However, the METADATA_CSUM and
1461 * GDT_CSUM bits are mutually exclusive.
1463 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1465 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1466 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1467 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1468 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1469 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1470 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1471 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1472 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1473 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1474 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1475 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1476 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1477 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1478 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1480 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1481 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1482 EXT4_FEATURE_INCOMPAT_META_BG)
1483 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1484 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1485 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1487 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1488 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1489 EXT4_FEATURE_INCOMPAT_RECOVER| \
1490 EXT4_FEATURE_INCOMPAT_META_BG)
1491 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1492 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1493 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1495 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1496 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1497 EXT4_FEATURE_INCOMPAT_RECOVER| \
1498 EXT4_FEATURE_INCOMPAT_META_BG| \
1499 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1500 EXT4_FEATURE_INCOMPAT_64BIT| \
1501 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1502 EXT4_FEATURE_INCOMPAT_MMP | \
1503 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1504 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1505 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1506 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1507 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1508 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1509 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1510 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1511 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1512 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1513 EXT4_FEATURE_RO_COMPAT_QUOTA)
1516 * Default values for user and/or group using reserved blocks
1518 #define EXT4_DEF_RESUID 0
1519 #define EXT4_DEF_RESGID 0
1521 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1524 * Default mount options
1526 #define EXT4_DEFM_DEBUG 0x0001
1527 #define EXT4_DEFM_BSDGROUPS 0x0002
1528 #define EXT4_DEFM_XATTR_USER 0x0004
1529 #define EXT4_DEFM_ACL 0x0008
1530 #define EXT4_DEFM_UID16 0x0010
1531 #define EXT4_DEFM_JMODE 0x0060
1532 #define EXT4_DEFM_JMODE_DATA 0x0020
1533 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1534 #define EXT4_DEFM_JMODE_WBACK 0x0060
1535 #define EXT4_DEFM_NOBARRIER 0x0100
1536 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1537 #define EXT4_DEFM_DISCARD 0x0400
1538 #define EXT4_DEFM_NODELALLOC 0x0800
1541 * Default journal batch times
1543 #define EXT4_DEF_MIN_BATCH_TIME 0
1544 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1547 * Minimum number of groups in a flexgroup before we separate out
1548 * directories into the first block group of a flexgroup
1550 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1553 * Structure of a directory entry
1555 #define EXT4_NAME_LEN 255
1557 struct ext4_dir_entry
{
1558 __le32 inode
; /* Inode number */
1559 __le16 rec_len
; /* Directory entry length */
1560 __le16 name_len
; /* Name length */
1561 char name
[EXT4_NAME_LEN
]; /* File name */
1565 * The new version of the directory entry. Since EXT4 structures are
1566 * stored in intel byte order, and the name_len field could never be
1567 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1570 struct ext4_dir_entry_2
{
1571 __le32 inode
; /* Inode number */
1572 __le16 rec_len
; /* Directory entry length */
1573 __u8 name_len
; /* Name length */
1575 char name
[EXT4_NAME_LEN
]; /* File name */
1579 * This is a bogus directory entry at the end of each leaf block that
1580 * records checksums.
1582 struct ext4_dir_entry_tail
{
1583 __le32 det_reserved_zero1
; /* Pretend to be unused */
1584 __le16 det_rec_len
; /* 12 */
1585 __u8 det_reserved_zero2
; /* Zero name length */
1586 __u8 det_reserved_ft
; /* 0xDE, fake file type */
1587 __le32 det_checksum
; /* crc32c(uuid+inum+dirblock) */
1590 #define EXT4_DIRENT_TAIL(block, blocksize) \
1591 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1593 sizeof(struct ext4_dir_entry_tail))))
1596 * Ext4 directory file types. Only the low 3 bits are used. The
1597 * other bits are reserved for now.
1599 #define EXT4_FT_UNKNOWN 0
1600 #define EXT4_FT_REG_FILE 1
1601 #define EXT4_FT_DIR 2
1602 #define EXT4_FT_CHRDEV 3
1603 #define EXT4_FT_BLKDEV 4
1604 #define EXT4_FT_FIFO 5
1605 #define EXT4_FT_SOCK 6
1606 #define EXT4_FT_SYMLINK 7
1608 #define EXT4_FT_MAX 8
1610 #define EXT4_FT_DIR_CSUM 0xDE
1613 * EXT4_DIR_PAD defines the directory entries boundaries
1615 * NOTE: It must be a multiple of 4
1617 #define EXT4_DIR_PAD 4
1618 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1619 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1621 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1624 * If we ever get support for fs block sizes > page_size, we'll need
1625 * to remove the #if statements in the next two functions...
1627 static inline unsigned int
1628 ext4_rec_len_from_disk(__le16 dlen
, unsigned blocksize
)
1630 unsigned len
= le16_to_cpu(dlen
);
1632 #if (PAGE_CACHE_SIZE >= 65536)
1633 if (len
== EXT4_MAX_REC_LEN
|| len
== 0)
1635 return (len
& 65532) | ((len
& 3) << 16);
1641 static inline __le16
ext4_rec_len_to_disk(unsigned len
, unsigned blocksize
)
1643 if ((len
> blocksize
) || (blocksize
> (1 << 18)) || (len
& 3))
1645 #if (PAGE_CACHE_SIZE >= 65536)
1647 return cpu_to_le16(len
);
1648 if (len
== blocksize
) {
1649 if (blocksize
== 65536)
1650 return cpu_to_le16(EXT4_MAX_REC_LEN
);
1652 return cpu_to_le16(0);
1654 return cpu_to_le16((len
& 65532) | ((len
>> 16) & 3));
1656 return cpu_to_le16(len
);
1661 * Hash Tree Directory indexing
1662 * (c) Daniel Phillips, 2001
1665 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1666 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1667 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1668 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1669 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1671 /* Legal values for the dx_root hash_version field: */
1673 #define DX_HASH_LEGACY 0
1674 #define DX_HASH_HALF_MD4 1
1675 #define DX_HASH_TEA 2
1676 #define DX_HASH_LEGACY_UNSIGNED 3
1677 #define DX_HASH_HALF_MD4_UNSIGNED 4
1678 #define DX_HASH_TEA_UNSIGNED 5
1680 static inline u32
ext4_chksum(struct ext4_sb_info
*sbi
, u32 crc
,
1681 const void *address
, unsigned int length
)
1684 struct shash_desc shash
;
1689 BUG_ON(crypto_shash_descsize(sbi
->s_chksum_driver
)!=sizeof(desc
.ctx
));
1691 desc
.shash
.tfm
= sbi
->s_chksum_driver
;
1692 desc
.shash
.flags
= 0;
1693 *(u32
*)desc
.ctx
= crc
;
1695 err
= crypto_shash_update(&desc
.shash
, address
, length
);
1698 return *(u32
*)desc
.ctx
;
1703 /* hash info structure used by the directory hash */
1713 /* 32 and 64 bit signed EOF for dx directories */
1714 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1715 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1719 * Control parameters used by ext4_htree_next_block
1721 #define HASH_NB_ALWAYS 1
1725 * Describe an inode's exact location on disk and in memory
1729 struct buffer_head
*bh
;
1730 unsigned long offset
;
1731 ext4_group_t block_group
;
1734 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
1736 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
1740 * This structure is stuffed into the struct file's private_data field
1741 * for directories. It is where we put information so that we can do
1742 * readdir operations in hash tree order.
1744 struct dir_private_info
{
1745 struct rb_root root
;
1746 struct rb_node
*curr_node
;
1747 struct fname
*extra_fname
;
1750 __u32 curr_minor_hash
;
1754 /* calculate the first block number of the group */
1755 static inline ext4_fsblk_t
1756 ext4_group_first_block_no(struct super_block
*sb
, ext4_group_t group_no
)
1758 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
1759 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
1763 * Special error return code only used by dx_probe() and its callers.
1765 #define ERR_BAD_DX_DIR -75000
1768 * Timeout and state flag for lazy initialization inode thread.
1770 #define EXT4_DEF_LI_WAIT_MULT 10
1771 #define EXT4_DEF_LI_MAX_START_DELAY 5
1772 #define EXT4_LAZYINIT_QUIT 0x0001
1773 #define EXT4_LAZYINIT_RUNNING 0x0002
1776 * Lazy inode table initialization info
1778 struct ext4_lazy_init
{
1779 unsigned long li_state
;
1780 struct list_head li_request_list
;
1781 struct mutex li_list_mtx
;
1784 struct ext4_li_request
{
1785 struct super_block
*lr_super
;
1786 struct ext4_sb_info
*lr_sbi
;
1787 ext4_group_t lr_next_group
;
1788 struct list_head lr_request
;
1789 unsigned long lr_next_sched
;
1790 unsigned long lr_timeout
;
1793 struct ext4_features
{
1794 struct kobject f_kobj
;
1795 struct completion f_kobj_unregister
;
1799 * This structure will be used for multiple mount protection. It will be
1800 * written into the block number saved in the s_mmp_block field in the
1801 * superblock. Programs that check MMP should assume that if
1802 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1803 * to use the filesystem, regardless of how old the timestamp is.
1805 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1806 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1807 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1808 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1811 __le32 mmp_magic
; /* Magic number for MMP */
1812 __le32 mmp_seq
; /* Sequence no. updated periodically */
1815 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1816 * purposes and do not affect the correctness of the algorithm
1818 __le64 mmp_time
; /* Time last updated */
1819 char mmp_nodename
[64]; /* Node which last updated MMP block */
1820 char mmp_bdevname
[32]; /* Bdev which last updated MMP block */
1823 * mmp_check_interval is used to verify if the MMP block has been
1824 * updated on the block device. The value is updated based on the
1825 * maximum time to write the MMP block during an update cycle.
1827 __le16 mmp_check_interval
;
1830 __le32 mmp_pad2
[226];
1831 __le32 mmp_checksum
; /* crc32c(uuid+mmp_block) */
1834 /* arguments passed to the mmp thread */
1836 struct buffer_head
*bh
; /* bh from initial read_mmp_block() */
1837 struct super_block
*sb
; /* super block of the fs */
1841 * Check interval multiplier
1842 * The MMP block is written every update interval and initially checked every
1843 * update interval x the multiplier (the value is then adapted based on the
1844 * write latency). The reason is that writes can be delayed under load and we
1845 * don't want readers to incorrectly assume that the filesystem is no longer
1848 #define EXT4_MMP_CHECK_MULT 2UL
1851 * Minimum interval for MMP checking in seconds.
1853 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1856 * Maximum interval for MMP checking in seconds.
1858 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1861 * Function prototypes
1865 * Ok, these declarations are also in <linux/kernel.h> but none of the
1866 * ext4 source programs needs to include it so they are duplicated here.
1868 # define NORET_TYPE /**/
1869 # define ATTRIB_NORET __attribute__((noreturn))
1870 # define NORET_AND noreturn,
1873 extern unsigned int ext4_count_free(char *bitmap
, unsigned numchars
);
1874 void ext4_inode_bitmap_csum_set(struct super_block
*sb
, ext4_group_t group
,
1875 struct ext4_group_desc
*gdp
,
1876 struct buffer_head
*bh
, int sz
);
1877 int ext4_inode_bitmap_csum_verify(struct super_block
*sb
, ext4_group_t group
,
1878 struct ext4_group_desc
*gdp
,
1879 struct buffer_head
*bh
, int sz
);
1880 void ext4_block_bitmap_csum_set(struct super_block
*sb
, ext4_group_t group
,
1881 struct ext4_group_desc
*gdp
,
1882 struct buffer_head
*bh
);
1883 int ext4_block_bitmap_csum_verify(struct super_block
*sb
, ext4_group_t group
,
1884 struct ext4_group_desc
*gdp
,
1885 struct buffer_head
*bh
);
1888 extern void ext4_get_group_no_and_offset(struct super_block
*sb
,
1889 ext4_fsblk_t blocknr
,
1890 ext4_group_t
*blockgrpp
,
1891 ext4_grpblk_t
*offsetp
);
1892 extern ext4_group_t
ext4_get_group_number(struct super_block
*sb
,
1893 ext4_fsblk_t block
);
1895 extern void ext4_validate_block_bitmap(struct super_block
*sb
,
1896 struct ext4_group_desc
*desc
,
1897 unsigned int block_group
,
1898 struct buffer_head
*bh
);
1899 extern unsigned int ext4_block_group(struct super_block
*sb
,
1900 ext4_fsblk_t blocknr
);
1901 extern ext4_grpblk_t
ext4_block_group_offset(struct super_block
*sb
,
1902 ext4_fsblk_t blocknr
);
1903 extern int ext4_bg_has_super(struct super_block
*sb
, ext4_group_t group
);
1904 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
,
1905 ext4_group_t group
);
1906 extern ext4_fsblk_t
ext4_new_meta_blocks(handle_t
*handle
, struct inode
*inode
,
1909 unsigned long *count
,
1911 extern int ext4_claim_free_clusters(struct ext4_sb_info
*sbi
,
1912 s64 nclusters
, unsigned int flags
);
1913 extern ext4_fsblk_t
ext4_count_free_clusters(struct super_block
*);
1914 extern void ext4_check_blocks_bitmap(struct super_block
*);
1915 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
1916 ext4_group_t block_group
,
1917 struct buffer_head
** bh
);
1918 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
1920 extern struct buffer_head
*ext4_read_block_bitmap_nowait(struct super_block
*sb
,
1921 ext4_group_t block_group
);
1922 extern int ext4_wait_block_bitmap(struct super_block
*sb
,
1923 ext4_group_t block_group
,
1924 struct buffer_head
*bh
);
1925 extern struct buffer_head
*ext4_read_block_bitmap(struct super_block
*sb
,
1926 ext4_group_t block_group
);
1927 extern void ext4_init_block_bitmap(struct super_block
*sb
,
1928 struct buffer_head
*bh
,
1930 struct ext4_group_desc
*desc
);
1931 extern unsigned ext4_free_clusters_after_init(struct super_block
*sb
,
1932 ext4_group_t block_group
,
1933 struct ext4_group_desc
*gdp
);
1934 extern unsigned ext4_num_overhead_clusters(struct super_block
*sb
,
1935 ext4_group_t block_group
,
1936 struct ext4_group_desc
*gdp
);
1937 ext4_fsblk_t
ext4_inode_to_goal_block(struct inode
*);
1940 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode
*,
1942 struct ext4_dir_entry_2
*,
1943 struct buffer_head
*, char *, int,
1945 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1946 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1947 (de), (bh), (buf), (size), (offset)))
1948 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
1950 struct ext4_dir_entry_2
*dirent
);
1951 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
1952 extern int ext4_find_dest_de(struct inode
*dir
, struct inode
*inode
,
1953 struct buffer_head
*bh
,
1954 void *buf
, int buf_size
,
1955 const char *name
, int namelen
,
1956 struct ext4_dir_entry_2
**dest_de
);
1957 void ext4_insert_dentry(struct inode
*inode
,
1958 struct ext4_dir_entry_2
*de
,
1960 const char *name
, int namelen
);
1961 static inline void ext4_update_dx_flag(struct inode
*inode
)
1963 if (!EXT4_HAS_COMPAT_FEATURE(inode
->i_sb
,
1964 EXT4_FEATURE_COMPAT_DIR_INDEX
))
1965 ext4_clear_inode_flag(inode
, EXT4_INODE_INDEX
);
1967 static unsigned char ext4_filetype_table
[] = {
1968 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1971 static inline unsigned char get_dtype(struct super_block
*sb
, int filetype
)
1973 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FILETYPE
) ||
1974 (filetype
>= EXT4_FT_MAX
))
1977 return ext4_filetype_table
[filetype
];
1981 extern int ext4_sync_file(struct file
*, loff_t
, loff_t
, int);
1982 extern int ext4_flush_unwritten_io(struct inode
*);
1985 extern int ext4fs_dirhash(const char *name
, int len
, struct
1986 dx_hash_info
*hinfo
);
1989 extern struct inode
*__ext4_new_inode(handle_t
*, struct inode
*, umode_t
,
1990 const struct qstr
*qstr
, __u32 goal
,
1991 uid_t
*owner
, int handle_type
,
1992 unsigned int line_no
, int nblocks
);
1994 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
1995 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
1997 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
1999 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2000 (type), __LINE__, (nblocks))
2003 extern void ext4_free_inode(handle_t
*, struct inode
*);
2004 extern struct inode
* ext4_orphan_get(struct super_block
*, unsigned long);
2005 extern unsigned long ext4_count_free_inodes(struct super_block
*);
2006 extern unsigned long ext4_count_dirs(struct super_block
*);
2007 extern void ext4_check_inodes_bitmap(struct super_block
*);
2008 extern void ext4_mark_bitmap_end(int start_bit
, int end_bit
, char *bitmap
);
2009 extern int ext4_init_inode_table(struct super_block
*sb
,
2010 ext4_group_t group
, int barrier
);
2011 extern void ext4_end_bitmap_read(struct buffer_head
*bh
, int uptodate
);
2014 extern long ext4_mb_stats
;
2015 extern long ext4_mb_max_to_scan
;
2016 extern int ext4_mb_init(struct super_block
*);
2017 extern int ext4_mb_release(struct super_block
*);
2018 extern ext4_fsblk_t
ext4_mb_new_blocks(handle_t
*,
2019 struct ext4_allocation_request
*, int *);
2020 extern int ext4_mb_reserve_blocks(struct super_block
*, int);
2021 extern void ext4_discard_preallocations(struct inode
*);
2022 extern int __init
ext4_init_mballoc(void);
2023 extern void ext4_exit_mballoc(void);
2024 extern void ext4_free_blocks(handle_t
*handle
, struct inode
*inode
,
2025 struct buffer_head
*bh
, ext4_fsblk_t block
,
2026 unsigned long count
, int flags
);
2027 extern int ext4_mb_alloc_groupinfo(struct super_block
*sb
,
2028 ext4_group_t ngroups
);
2029 extern int ext4_mb_add_groupinfo(struct super_block
*sb
,
2030 ext4_group_t i
, struct ext4_group_desc
*desc
);
2031 extern int ext4_group_add_blocks(handle_t
*handle
, struct super_block
*sb
,
2032 ext4_fsblk_t block
, unsigned long count
);
2033 extern int ext4_trim_fs(struct super_block
*, struct fstrim_range
*);
2036 struct buffer_head
*ext4_getblk(handle_t
*, struct inode
*,
2037 ext4_lblk_t
, int, int *);
2038 struct buffer_head
*ext4_bread(handle_t
*, struct inode
*,
2039 ext4_lblk_t
, int, int *);
2040 int ext4_get_block_write(struct inode
*inode
, sector_t iblock
,
2041 struct buffer_head
*bh_result
, int create
);
2042 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
2043 struct buffer_head
*bh_result
, int create
);
2044 int ext4_da_get_block_prep(struct inode
*inode
, sector_t iblock
,
2045 struct buffer_head
*bh
, int create
);
2046 int ext4_walk_page_buffers(handle_t
*handle
,
2047 struct buffer_head
*head
,
2051 int (*fn
)(handle_t
*handle
,
2052 struct buffer_head
*bh
));
2053 int do_journal_get_write_access(handle_t
*handle
,
2054 struct buffer_head
*bh
);
2055 #define FALL_BACK_TO_NONDELALLOC 1
2056 #define CONVERT_INLINE_DATA 2
2058 extern struct inode
*ext4_iget(struct super_block
*, unsigned long);
2059 extern int ext4_write_inode(struct inode
*, struct writeback_control
*);
2060 extern int ext4_setattr(struct dentry
*, struct iattr
*);
2061 extern int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
2062 struct kstat
*stat
);
2063 extern void ext4_evict_inode(struct inode
*);
2064 extern void ext4_clear_inode(struct inode
*);
2065 extern int ext4_sync_inode(handle_t
*, struct inode
*);
2066 extern void ext4_dirty_inode(struct inode
*, int);
2067 extern int ext4_change_inode_journal_flag(struct inode
*, int);
2068 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
2069 extern int ext4_can_truncate(struct inode
*inode
);
2070 extern void ext4_truncate(struct inode
*);
2071 extern int ext4_punch_hole(struct file
*file
, loff_t offset
, loff_t length
);
2072 extern int ext4_truncate_restart_trans(handle_t
*, struct inode
*, int nblocks
);
2073 extern void ext4_set_inode_flags(struct inode
*);
2074 extern void ext4_get_inode_flags(struct ext4_inode_info
*);
2075 extern int ext4_alloc_da_blocks(struct inode
*inode
);
2076 extern void ext4_set_aops(struct inode
*inode
);
2077 extern int ext4_writepage_trans_blocks(struct inode
*);
2078 extern int ext4_chunk_trans_blocks(struct inode
*, int nrblocks
);
2079 extern int ext4_block_truncate_page(handle_t
*handle
,
2080 struct address_space
*mapping
, loff_t from
);
2081 extern int ext4_block_zero_page_range(handle_t
*handle
,
2082 struct address_space
*mapping
, loff_t from
, loff_t length
);
2083 extern int ext4_zero_partial_blocks(handle_t
*handle
, struct inode
*inode
,
2084 loff_t lstart
, loff_t lend
);
2085 extern int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2086 extern qsize_t
*ext4_get_reserved_space(struct inode
*inode
);
2087 extern void ext4_da_update_reserve_space(struct inode
*inode
,
2088 int used
, int quota_claim
);
2091 extern int ext4_ind_map_blocks(handle_t
*handle
, struct inode
*inode
,
2092 struct ext4_map_blocks
*map
, int flags
);
2093 extern ssize_t
ext4_ind_direct_IO(int rw
, struct kiocb
*iocb
,
2094 const struct iovec
*iov
, loff_t offset
,
2095 unsigned long nr_segs
);
2096 extern int ext4_ind_calc_metadata_amount(struct inode
*inode
, sector_t lblock
);
2097 extern int ext4_ind_trans_blocks(struct inode
*inode
, int nrblocks
);
2098 extern void ext4_ind_truncate(handle_t
*, struct inode
*inode
);
2099 extern int ext4_free_hole_blocks(handle_t
*handle
, struct inode
*inode
,
2100 ext4_lblk_t first
, ext4_lblk_t stop
);
2103 extern long ext4_ioctl(struct file
*, unsigned int, unsigned long);
2104 extern long ext4_compat_ioctl(struct file
*, unsigned int, unsigned long);
2107 extern int ext4_ext_migrate(struct inode
*);
2108 extern int ext4_ind_migrate(struct inode
*inode
);
2111 extern int ext4_dirent_csum_verify(struct inode
*inode
,
2112 struct ext4_dir_entry
*dirent
);
2113 extern int ext4_orphan_add(handle_t
*, struct inode
*);
2114 extern int ext4_orphan_del(handle_t
*, struct inode
*);
2115 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
2116 __u32 start_minor_hash
, __u32
*next_hash
);
2117 extern int search_dir(struct buffer_head
*bh
,
2121 const struct qstr
*d_name
,
2122 unsigned int offset
,
2123 struct ext4_dir_entry_2
**res_dir
);
2124 extern int ext4_generic_delete_entry(handle_t
*handle
,
2126 struct ext4_dir_entry_2
*de_del
,
2127 struct buffer_head
*bh
,
2133 extern int ext4_group_add(struct super_block
*sb
,
2134 struct ext4_new_group_data
*input
);
2135 extern int ext4_group_extend(struct super_block
*sb
,
2136 struct ext4_super_block
*es
,
2137 ext4_fsblk_t n_blocks_count
);
2138 extern int ext4_resize_fs(struct super_block
*sb
, ext4_fsblk_t n_blocks_count
);
2141 extern int ext4_calculate_overhead(struct super_block
*sb
);
2142 extern int ext4_superblock_csum_verify(struct super_block
*sb
,
2143 struct ext4_super_block
*es
);
2144 extern void ext4_superblock_csum_set(struct super_block
*sb
);
2145 extern void *ext4_kvmalloc(size_t size
, gfp_t flags
);
2146 extern void *ext4_kvzalloc(size_t size
, gfp_t flags
);
2147 extern void ext4_kvfree(void *ptr
);
2148 extern int ext4_alloc_flex_bg_array(struct super_block
*sb
,
2149 ext4_group_t ngroup
);
2150 extern const char *ext4_decode_error(struct super_block
*sb
, int errno
,
2152 extern __printf(4, 5)
2153 void __ext4_error(struct super_block
*, const char *, unsigned int,
2155 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2156 __LINE__, ## message)
2157 extern __printf(5, 6)
2158 void ext4_error_inode(struct inode
*, const char *, unsigned int, ext4_fsblk_t
,
2160 extern __printf(5, 6)
2161 void ext4_error_file(struct file
*, const char *, unsigned int, ext4_fsblk_t
,
2163 extern void __ext4_std_error(struct super_block
*, const char *,
2165 extern __printf(4, 5)
2166 void __ext4_abort(struct super_block
*, const char *, unsigned int,
2168 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2169 __LINE__, ## message)
2170 extern __printf(4, 5)
2171 void __ext4_warning(struct super_block
*, const char *, unsigned int,
2173 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2174 __LINE__, ## message)
2175 extern __printf(3, 4)
2176 void ext4_msg(struct super_block
*, const char *, const char *, ...);
2177 extern void __dump_mmp_msg(struct super_block
*, struct mmp_struct
*mmp
,
2178 const char *, unsigned int, const char *);
2179 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2181 extern __printf(7, 8)
2182 void __ext4_grp_locked_error(const char *, unsigned int,
2183 struct super_block
*, ext4_group_t
,
2184 unsigned long, ext4_fsblk_t
,
2186 #define ext4_grp_locked_error(sb, grp, message...) \
2187 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2188 extern void ext4_update_dynamic_rev(struct super_block
*sb
);
2189 extern int ext4_update_compat_feature(handle_t
*handle
, struct super_block
*sb
,
2191 extern int ext4_update_rocompat_feature(handle_t
*handle
,
2192 struct super_block
*sb
, __u32 rocompat
);
2193 extern int ext4_update_incompat_feature(handle_t
*handle
,
2194 struct super_block
*sb
, __u32 incompat
);
2195 extern ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
2196 struct ext4_group_desc
*bg
);
2197 extern ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
2198 struct ext4_group_desc
*bg
);
2199 extern ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
2200 struct ext4_group_desc
*bg
);
2201 extern __u32
ext4_free_group_clusters(struct super_block
*sb
,
2202 struct ext4_group_desc
*bg
);
2203 extern __u32
ext4_free_inodes_count(struct super_block
*sb
,
2204 struct ext4_group_desc
*bg
);
2205 extern __u32
ext4_used_dirs_count(struct super_block
*sb
,
2206 struct ext4_group_desc
*bg
);
2207 extern __u32
ext4_itable_unused_count(struct super_block
*sb
,
2208 struct ext4_group_desc
*bg
);
2209 extern void ext4_block_bitmap_set(struct super_block
*sb
,
2210 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2211 extern void ext4_inode_bitmap_set(struct super_block
*sb
,
2212 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2213 extern void ext4_inode_table_set(struct super_block
*sb
,
2214 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2215 extern void ext4_free_group_clusters_set(struct super_block
*sb
,
2216 struct ext4_group_desc
*bg
,
2218 extern void ext4_free_inodes_set(struct super_block
*sb
,
2219 struct ext4_group_desc
*bg
, __u32 count
);
2220 extern void ext4_used_dirs_set(struct super_block
*sb
,
2221 struct ext4_group_desc
*bg
, __u32 count
);
2222 extern void ext4_itable_unused_set(struct super_block
*sb
,
2223 struct ext4_group_desc
*bg
, __u32 count
);
2224 extern int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 group
,
2225 struct ext4_group_desc
*gdp
);
2226 extern void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 group
,
2227 struct ext4_group_desc
*gdp
);
2228 extern int ext4_register_li_request(struct super_block
*sb
,
2229 ext4_group_t first_not_zeroed
);
2231 static inline int ext4_has_group_desc_csum(struct super_block
*sb
)
2233 return EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2234 EXT4_FEATURE_RO_COMPAT_GDT_CSUM
|
2235 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
);
2238 static inline ext4_fsblk_t
ext4_blocks_count(struct ext4_super_block
*es
)
2240 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_blocks_count_hi
) << 32) |
2241 le32_to_cpu(es
->s_blocks_count_lo
);
2244 static inline ext4_fsblk_t
ext4_r_blocks_count(struct ext4_super_block
*es
)
2246 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_r_blocks_count_hi
) << 32) |
2247 le32_to_cpu(es
->s_r_blocks_count_lo
);
2250 static inline ext4_fsblk_t
ext4_free_blocks_count(struct ext4_super_block
*es
)
2252 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_free_blocks_count_hi
) << 32) |
2253 le32_to_cpu(es
->s_free_blocks_count_lo
);
2256 static inline void ext4_blocks_count_set(struct ext4_super_block
*es
,
2259 es
->s_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2260 es
->s_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2263 static inline void ext4_free_blocks_count_set(struct ext4_super_block
*es
,
2266 es
->s_free_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2267 es
->s_free_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2270 static inline void ext4_r_blocks_count_set(struct ext4_super_block
*es
,
2273 es
->s_r_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2274 es
->s_r_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2277 static inline loff_t
ext4_isize(struct ext4_inode
*raw_inode
)
2279 if (S_ISREG(le16_to_cpu(raw_inode
->i_mode
)))
2280 return ((loff_t
)le32_to_cpu(raw_inode
->i_size_high
) << 32) |
2281 le32_to_cpu(raw_inode
->i_size_lo
);
2283 return (loff_t
) le32_to_cpu(raw_inode
->i_size_lo
);
2286 static inline void ext4_isize_set(struct ext4_inode
*raw_inode
, loff_t i_size
)
2288 raw_inode
->i_size_lo
= cpu_to_le32(i_size
);
2289 raw_inode
->i_size_high
= cpu_to_le32(i_size
>> 32);
2293 struct ext4_group_info
*ext4_get_group_info(struct super_block
*sb
,
2296 struct ext4_group_info
***grp_info
;
2297 long indexv
, indexh
;
2298 grp_info
= EXT4_SB(sb
)->s_group_info
;
2299 indexv
= group
>> (EXT4_DESC_PER_BLOCK_BITS(sb
));
2300 indexh
= group
& ((EXT4_DESC_PER_BLOCK(sb
)) - 1);
2301 return grp_info
[indexv
][indexh
];
2305 * Reading s_groups_count requires using smp_rmb() afterwards. See
2306 * the locking protocol documented in the comments of ext4_group_add()
2309 static inline ext4_group_t
ext4_get_groups_count(struct super_block
*sb
)
2311 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2317 static inline ext4_group_t
ext4_flex_group(struct ext4_sb_info
*sbi
,
2318 ext4_group_t block_group
)
2320 return block_group
>> sbi
->s_log_groups_per_flex
;
2323 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info
*sbi
)
2325 return 1 << sbi
->s_log_groups_per_flex
;
2328 #define ext4_std_error(sb, errno) \
2331 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2335 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2336 * counters. So we need to make sure we have free clusters more
2337 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2339 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2341 #define EXT4_FREECLUSTERS_WATERMARK 0
2344 static inline void ext4_update_i_disksize(struct inode
*inode
, loff_t newsize
)
2347 * XXX: replace with spinlock if seen contended -bzzz
2349 down_write(&EXT4_I(inode
)->i_data_sem
);
2350 if (newsize
> EXT4_I(inode
)->i_disksize
)
2351 EXT4_I(inode
)->i_disksize
= newsize
;
2352 up_write(&EXT4_I(inode
)->i_data_sem
);
2356 struct ext4_group_info
{
2357 unsigned long bb_state
;
2358 struct rb_root bb_free_root
;
2359 ext4_grpblk_t bb_first_free
; /* first free block */
2360 ext4_grpblk_t bb_free
; /* total free blocks */
2361 ext4_grpblk_t bb_fragments
; /* nr of freespace fragments */
2362 ext4_grpblk_t bb_largest_free_order
;/* order of largest frag in BG */
2363 struct list_head bb_prealloc_list
;
2367 struct rw_semaphore alloc_sem
;
2368 ext4_grpblk_t bb_counters
[]; /* Nr of free power-of-two-block
2369 * regions, index is order.
2370 * bb_counters[3] = 5 means
2371 * 5 free 8-block regions. */
2374 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2375 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2377 #define EXT4_MB_GRP_NEED_INIT(grp) \
2378 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2380 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2381 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2382 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2383 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2384 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2385 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2387 #define EXT4_MAX_CONTENTION 8
2388 #define EXT4_CONTENTION_THRESHOLD 2
2390 static inline spinlock_t
*ext4_group_lock_ptr(struct super_block
*sb
,
2393 return bgl_lock_ptr(EXT4_SB(sb
)->s_blockgroup_lock
, group
);
2397 * Returns true if the filesystem is busy enough that attempts to
2398 * access the block group locks has run into contention.
2400 static inline int ext4_fs_is_busy(struct ext4_sb_info
*sbi
)
2402 return (atomic_read(&sbi
->s_lock_busy
) > EXT4_CONTENTION_THRESHOLD
);
2405 static inline void ext4_lock_group(struct super_block
*sb
, ext4_group_t group
)
2407 spinlock_t
*lock
= ext4_group_lock_ptr(sb
, group
);
2408 if (spin_trylock(lock
))
2410 * We're able to grab the lock right away, so drop the
2411 * lock contention counter.
2413 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, -1, 0);
2416 * The lock is busy, so bump the contention counter,
2417 * and then wait on the spin lock.
2419 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, 1,
2420 EXT4_MAX_CONTENTION
);
2425 static inline void ext4_unlock_group(struct super_block
*sb
,
2428 spin_unlock(ext4_group_lock_ptr(sb
, group
));
2432 * Block validity checking
2434 #define ext4_check_indirect_blockref(inode, bh) \
2435 ext4_check_blockref(__func__, __LINE__, inode, \
2436 (__le32 *)(bh)->b_data, \
2437 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2439 #define ext4_ind_check_inode(inode) \
2440 ext4_check_blockref(__func__, __LINE__, inode, \
2441 EXT4_I(inode)->i_data, \
2445 * Inodes and files operations
2449 extern const struct file_operations ext4_dir_operations
;
2452 extern const struct inode_operations ext4_file_inode_operations
;
2453 extern const struct file_operations ext4_file_operations
;
2454 extern loff_t
ext4_llseek(struct file
*file
, loff_t offset
, int origin
);
2455 extern void ext4_unwritten_wait(struct inode
*inode
);
2458 extern int ext4_has_inline_data(struct inode
*inode
);
2459 extern int ext4_get_inline_size(struct inode
*inode
);
2460 extern int ext4_get_max_inline_size(struct inode
*inode
);
2461 extern int ext4_find_inline_data_nolock(struct inode
*inode
);
2462 extern void ext4_write_inline_data(struct inode
*inode
,
2463 struct ext4_iloc
*iloc
,
2464 void *buffer
, loff_t pos
,
2466 extern int ext4_prepare_inline_data(handle_t
*handle
, struct inode
*inode
,
2468 extern int ext4_init_inline_data(handle_t
*handle
, struct inode
*inode
,
2470 extern int ext4_destroy_inline_data(handle_t
*handle
, struct inode
*inode
);
2472 extern int ext4_readpage_inline(struct inode
*inode
, struct page
*page
);
2473 extern int ext4_try_to_write_inline_data(struct address_space
*mapping
,
2474 struct inode
*inode
,
2475 loff_t pos
, unsigned len
,
2477 struct page
**pagep
);
2478 extern int ext4_write_inline_data_end(struct inode
*inode
,
2479 loff_t pos
, unsigned len
,
2482 extern struct buffer_head
*
2483 ext4_journalled_write_inline_data(struct inode
*inode
,
2486 extern int ext4_da_write_inline_data_begin(struct address_space
*mapping
,
2487 struct inode
*inode
,
2488 loff_t pos
, unsigned len
,
2490 struct page
**pagep
,
2492 extern int ext4_da_write_inline_data_end(struct inode
*inode
, loff_t pos
,
2493 unsigned len
, unsigned copied
,
2495 extern int ext4_try_add_inline_entry(handle_t
*handle
, struct dentry
*dentry
,
2496 struct inode
*inode
);
2497 extern int ext4_try_create_inline_dir(handle_t
*handle
,
2498 struct inode
*parent
,
2499 struct inode
*inode
);
2500 extern int ext4_read_inline_dir(struct file
*filp
,
2501 void *dirent
, filldir_t filldir
,
2502 int *has_inline_data
);
2503 extern int htree_inlinedir_to_tree(struct file
*dir_file
,
2504 struct inode
*dir
, ext4_lblk_t block
,
2505 struct dx_hash_info
*hinfo
,
2506 __u32 start_hash
, __u32 start_minor_hash
,
2507 int *has_inline_data
);
2508 extern struct buffer_head
*ext4_find_inline_entry(struct inode
*dir
,
2509 const struct qstr
*d_name
,
2510 struct ext4_dir_entry_2
**res_dir
,
2511 int *has_inline_data
);
2512 extern int ext4_delete_inline_entry(handle_t
*handle
,
2514 struct ext4_dir_entry_2
*de_del
,
2515 struct buffer_head
*bh
,
2516 int *has_inline_data
);
2517 extern int empty_inline_dir(struct inode
*dir
, int *has_inline_data
);
2518 extern struct buffer_head
*ext4_get_first_inline_block(struct inode
*inode
,
2519 struct ext4_dir_entry_2
**parent_de
,
2521 extern int ext4_inline_data_fiemap(struct inode
*inode
,
2522 struct fiemap_extent_info
*fieinfo
,
2524 extern int ext4_try_to_evict_inline_data(handle_t
*handle
,
2525 struct inode
*inode
,
2527 extern void ext4_inline_data_truncate(struct inode
*inode
, int *has_inline
);
2529 extern int ext4_convert_inline_data(struct inode
*inode
);
2532 extern const struct inode_operations ext4_dir_inode_operations
;
2533 extern const struct inode_operations ext4_special_inode_operations
;
2534 extern struct dentry
*ext4_get_parent(struct dentry
*child
);
2535 extern struct ext4_dir_entry_2
*ext4_init_dot_dotdot(struct inode
*inode
,
2536 struct ext4_dir_entry_2
*de
,
2537 int blocksize
, int csum_size
,
2538 unsigned int parent_ino
, int dotdot_real_len
);
2539 extern void initialize_dirent_tail(struct ext4_dir_entry_tail
*t
,
2540 unsigned int blocksize
);
2541 extern int ext4_handle_dirty_dirent_node(handle_t
*handle
,
2542 struct inode
*inode
,
2543 struct buffer_head
*bh
);
2545 static unsigned char ext4_type_by_mode
[S_IFMT
>> S_SHIFT
] = {
2546 [S_IFREG
>> S_SHIFT
] = EXT4_FT_REG_FILE
,
2547 [S_IFDIR
>> S_SHIFT
] = EXT4_FT_DIR
,
2548 [S_IFCHR
>> S_SHIFT
] = EXT4_FT_CHRDEV
,
2549 [S_IFBLK
>> S_SHIFT
] = EXT4_FT_BLKDEV
,
2550 [S_IFIFO
>> S_SHIFT
] = EXT4_FT_FIFO
,
2551 [S_IFSOCK
>> S_SHIFT
] = EXT4_FT_SOCK
,
2552 [S_IFLNK
>> S_SHIFT
] = EXT4_FT_SYMLINK
,
2555 static inline void ext4_set_de_type(struct super_block
*sb
,
2556 struct ext4_dir_entry_2
*de
,
2558 if (EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FILETYPE
))
2559 de
->file_type
= ext4_type_by_mode
[(mode
& S_IFMT
)>>S_SHIFT
];
2564 extern const struct inode_operations ext4_symlink_inode_operations
;
2565 extern const struct inode_operations ext4_fast_symlink_inode_operations
;
2567 /* block_validity */
2568 extern void ext4_release_system_zone(struct super_block
*sb
);
2569 extern int ext4_setup_system_zone(struct super_block
*sb
);
2570 extern int __init
ext4_init_system_zone(void);
2571 extern void ext4_exit_system_zone(void);
2572 extern int ext4_data_block_valid(struct ext4_sb_info
*sbi
,
2573 ext4_fsblk_t start_blk
,
2574 unsigned int count
);
2575 extern int ext4_check_blockref(const char *, unsigned int,
2576 struct inode
*, __le32
*, unsigned int);
2579 struct ext4_ext_path
;
2582 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
2583 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
2584 extern int ext4_ext_index_trans_blocks(struct inode
*inode
, int extents
);
2585 extern int ext4_ext_map_blocks(handle_t
*handle
, struct inode
*inode
,
2586 struct ext4_map_blocks
*map
, int flags
);
2587 extern void ext4_ext_truncate(handle_t
*, struct inode
*);
2588 extern int ext4_ext_remove_space(struct inode
*inode
, ext4_lblk_t start
,
2590 extern void ext4_ext_init(struct super_block
*);
2591 extern void ext4_ext_release(struct super_block
*);
2592 extern long ext4_fallocate(struct file
*file
, int mode
, loff_t offset
,
2594 extern int ext4_convert_unwritten_extents(struct inode
*inode
, loff_t offset
,
2596 extern int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
2597 struct ext4_map_blocks
*map
, int flags
);
2598 extern int ext4_ext_calc_metadata_amount(struct inode
*inode
,
2599 ext4_lblk_t lblocks
);
2600 extern int ext4_extent_tree_init(handle_t
*, struct inode
*);
2601 extern int ext4_ext_calc_credits_for_single_extent(struct inode
*inode
,
2603 struct ext4_ext_path
*path
);
2604 extern int ext4_can_extents_be_merged(struct inode
*inode
,
2605 struct ext4_extent
*ex1
,
2606 struct ext4_extent
*ex2
);
2607 extern int ext4_ext_insert_extent(handle_t
*, struct inode
*,
2608 struct ext4_ext_path
*,
2609 struct ext4_extent
*, int);
2610 extern struct ext4_ext_path
*ext4_ext_find_extent(struct inode
*, ext4_lblk_t
,
2611 struct ext4_ext_path
*);
2612 extern void ext4_ext_drop_refs(struct ext4_ext_path
*);
2613 extern int ext4_ext_check_inode(struct inode
*inode
);
2614 extern int ext4_find_delalloc_range(struct inode
*inode
,
2615 ext4_lblk_t lblk_start
,
2616 ext4_lblk_t lblk_end
);
2617 extern int ext4_find_delalloc_cluster(struct inode
*inode
, ext4_lblk_t lblk
);
2618 extern int ext4_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
2619 __u64 start
, __u64 len
);
2623 extern void ext4_double_down_write_data_sem(struct inode
*first
,
2624 struct inode
*second
);
2625 extern void ext4_double_up_write_data_sem(struct inode
*orig_inode
,
2626 struct inode
*donor_inode
);
2627 void ext4_inode_double_lock(struct inode
*inode1
, struct inode
*inode2
);
2628 void ext4_inode_double_unlock(struct inode
*inode1
, struct inode
*inode2
);
2629 extern int ext4_move_extents(struct file
*o_filp
, struct file
*d_filp
,
2630 __u64 start_orig
, __u64 start_donor
,
2631 __u64 len
, __u64
*moved_len
);
2634 extern int __init
ext4_init_pageio(void);
2635 extern void ext4_exit_pageio(void);
2636 extern void ext4_ioend_shutdown(struct inode
*);
2637 extern ext4_io_end_t
*ext4_init_io_end(struct inode
*inode
, gfp_t flags
);
2638 extern ext4_io_end_t
*ext4_get_io_end(ext4_io_end_t
*io_end
);
2639 extern int ext4_put_io_end(ext4_io_end_t
*io_end
);
2640 extern void ext4_put_io_end_defer(ext4_io_end_t
*io_end
);
2641 extern void ext4_io_submit_init(struct ext4_io_submit
*io
,
2642 struct writeback_control
*wbc
);
2643 extern void ext4_end_io_work(struct work_struct
*work
);
2644 extern void ext4_io_submit(struct ext4_io_submit
*io
);
2645 extern int ext4_bio_write_page(struct ext4_io_submit
*io
,
2648 struct writeback_control
*wbc
);
2651 extern int ext4_multi_mount_protect(struct super_block
*, ext4_fsblk_t
);
2652 extern void ext4_mmp_csum_set(struct super_block
*sb
, struct mmp_struct
*mmp
);
2653 extern int ext4_mmp_csum_verify(struct super_block
*sb
,
2654 struct mmp_struct
*mmp
);
2656 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2657 enum ext4_state_bits
{
2658 BH_Uninit
/* blocks are allocated but uninitialized on disk */
2659 = BH_JBDPrivateStart
,
2660 BH_AllocFromCluster
, /* allocated blocks were part of already
2661 * allocated cluster. Note that this flag will
2662 * never, ever appear in a buffer_head's state
2663 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2667 BUFFER_FNS(Uninit
, uninit
)
2668 TAS_BUFFER_FNS(Uninit
, uninit
)
2671 * Add new method to test whether block and inode bitmaps are properly
2672 * initialized. With uninit_bg reading the block from disk is not enough
2673 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2675 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2677 static inline int bitmap_uptodate(struct buffer_head
*bh
)
2679 return (buffer_uptodate(bh
) &&
2680 test_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
));
2682 static inline void set_bitmap_uptodate(struct buffer_head
*bh
)
2684 set_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
);
2688 * Disable DIO read nolock optimization, so new dioreaders will be forced
2691 static inline void ext4_inode_block_unlocked_dio(struct inode
*inode
)
2693 ext4_set_inode_state(inode
, EXT4_STATE_DIOREAD_LOCK
);
2696 static inline void ext4_inode_resume_unlocked_dio(struct inode
*inode
)
2699 ext4_clear_inode_state(inode
, EXT4_STATE_DIOREAD_LOCK
);
2702 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2704 /* For ioend & aio unwritten conversion wait queues */
2705 #define EXT4_WQ_HASH_SZ 37
2706 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2708 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2710 extern wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
2711 extern struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
2713 #define EXT4_RESIZING 0
2714 extern int ext4_resize_begin(struct super_block
*sb
);
2715 extern void ext4_resize_end(struct super_block
*sb
);
2717 #endif /* __KERNEL__ */
2719 #endif /* _EXT4_H */