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 <linux/ratelimit.h>
33 #include <crypto/hash.h>
34 #include <linux/falloc.h>
36 #include <linux/compat.h>
40 * The fourth extended filesystem constants/structures
44 * Define EXT4FS_DEBUG to produce debug messages
52 #define ext4_debug(f, a...) \
54 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
55 __FILE__, __LINE__, __func__); \
56 printk(KERN_DEBUG f, ## a); \
59 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
63 * Turn on EXT_DEBUG to get lots of info about extents operations.
67 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
69 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
72 #define EXT4_ERROR_INODE(inode, fmt, a...) \
73 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
75 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
76 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
78 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
79 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
81 /* data type for block offset of block group */
82 typedef int ext4_grpblk_t;
84 /* data type for filesystem-wide blocks number */
85 typedef unsigned long long ext4_fsblk_t;
87 /* data type for file logical block number */
88 typedef __u32 ext4_lblk_t;
90 /* data type for block group number */
91 typedef unsigned int ext4_group_t;
94 * Flags used in mballoc's allocation_context flags field.
96 * Also used to show what's going on for debugging purposes when the
97 * flag field is exported via the traceport interface
100 /* prefer goal again. length */
101 #define EXT4_MB_HINT_MERGE 0x0001
102 /* blocks already reserved */
103 #define EXT4_MB_HINT_RESERVED 0x0002
104 /* metadata is being allocated */
105 #define EXT4_MB_HINT_METADATA 0x0004
106 /* first blocks in the file */
107 #define EXT4_MB_HINT_FIRST 0x0008
108 /* search for the best chunk */
109 #define EXT4_MB_HINT_BEST 0x0010
110 /* data is being allocated */
111 #define EXT4_MB_HINT_DATA 0x0020
112 /* don't preallocate (for tails) */
113 #define EXT4_MB_HINT_NOPREALLOC 0x0040
114 /* allocate for locality group */
115 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
116 /* allocate goal blocks or none */
117 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
118 /* goal is meaningful */
119 #define EXT4_MB_HINT_TRY_GOAL 0x0200
120 /* blocks already pre-reserved by delayed allocation */
121 #define EXT4_MB_DELALLOC_RESERVED 0x0400
122 /* We are doing stream allocation */
123 #define EXT4_MB_STREAM_ALLOC 0x0800
124 /* Use reserved root blocks if needed */
125 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
126 /* Use blocks from reserved pool */
127 #define EXT4_MB_USE_RESERVED 0x2000
129 struct ext4_allocation_request {
130 /* target inode for block we're allocating */
132 /* how many blocks we want to allocate */
134 /* logical block in target inode */
136 /* the closest logical allocated block to the left */
138 /* the closest logical allocated block to the right */
140 /* phys. target (a hint) */
142 /* phys. block for the closest logical allocated block to the left */
144 /* phys. block for the closest logical allocated block to the right */
146 /* flags. see above EXT4_MB_HINT_* */
151 * Logical to physical block mapping, used by ext4_map_blocks()
153 * This structure is used to pass requests into ext4_map_blocks() as
154 * well as to store the information returned by ext4_map_blocks(). It
155 * takes less room on the stack than a struct buffer_head.
157 #define EXT4_MAP_NEW (1 << BH_New)
158 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
159 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
160 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
161 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
162 * ext4_map_blocks wants to know whether or not the underlying cluster has
163 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
164 * the requested mapping was from previously mapped (or delayed allocated)
165 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
166 * should never appear on buffer_head's state flags.
168 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
169 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
170 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
171 EXT4_MAP_FROM_CLUSTER)
173 struct ext4_map_blocks {
177 unsigned int m_flags;
181 * Flags for ext4_io_end->flags
183 #define EXT4_IO_END_UNWRITTEN 0x0001
186 * For converting uninitialized extents on a work queue. 'handle' is used for
187 * buffered writeback.
189 typedef struct ext4_io_end {
190 struct list_head list; /* per-file finished IO list */
191 handle_t *handle; /* handle reserved for extent
193 struct inode *inode; /* file being written to */
194 struct bio *bio; /* Linked list of completed
195 * bios covering the extent */
196 unsigned int flag; /* unwritten or not */
197 loff_t offset; /* offset in the file */
198 ssize_t size; /* size of the extent */
199 atomic_t count; /* reference counter */
202 struct ext4_io_submit {
205 ext4_io_end_t *io_end;
206 sector_t io_next_block;
210 * Special inodes numbers
212 #define EXT4_BAD_INO 1 /* Bad blocks inode */
213 #define EXT4_ROOT_INO 2 /* Root inode */
214 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
215 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
216 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
217 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
218 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
219 #define EXT4_JOURNAL_INO 8 /* Journal inode */
221 /* First non-reserved inode for old ext4 filesystems */
222 #define EXT4_GOOD_OLD_FIRST_INO 11
225 * Maximal count of links to a file
227 #define EXT4_LINK_MAX 65000
230 * Macro-instructions used to manage several block sizes
232 #define EXT4_MIN_BLOCK_SIZE 1024
233 #define EXT4_MAX_BLOCK_SIZE 65536
234 #define EXT4_MIN_BLOCK_LOG_SIZE 10
235 #define EXT4_MAX_BLOCK_LOG_SIZE 16
237 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
239 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
241 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
242 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
243 EXT4_SB(s)->s_cluster_bits)
245 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
246 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
248 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
251 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
252 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
253 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
255 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
256 EXT4_GOOD_OLD_INODE_SIZE : \
258 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
259 EXT4_GOOD_OLD_FIRST_INO : \
262 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
264 /* Translate a block number to a cluster number */
265 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
266 /* Translate a cluster number to a block number */
267 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
268 /* Translate # of blks to # of clusters */
269 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
270 (sbi)->s_cluster_bits)
271 /* Mask out the low bits to get the starting block of the cluster */
272 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
273 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
274 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
275 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
276 /* Get the cluster offset */
277 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
278 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
279 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
280 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
283 * Structure of a blocks group descriptor
285 struct ext4_group_desc
287 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
288 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
289 __le32 bg_inode_table_lo; /* Inodes table block */
290 __le16 bg_free_blocks_count_lo;/* Free blocks count */
291 __le16 bg_free_inodes_count_lo;/* Free inodes count */
292 __le16 bg_used_dirs_count_lo; /* Directories count */
293 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
294 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
295 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
296 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
297 __le16 bg_itable_unused_lo; /* Unused inodes count */
298 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
299 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
300 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
301 __le32 bg_inode_table_hi; /* Inodes table block MSB */
302 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
303 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
304 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
305 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
306 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
307 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
308 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
312 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
313 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
315 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
316 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
320 * Structure of a flex block group info
324 atomic64_t free_clusters;
325 atomic_t free_inodes;
329 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
330 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
331 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
334 * Macro-instructions used to manage group descriptors
336 #define EXT4_MIN_DESC_SIZE 32
337 #define EXT4_MIN_DESC_SIZE_64BIT 64
338 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
339 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
341 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
342 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
343 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
344 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
345 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
347 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
348 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
349 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
353 * Constants relative to the data blocks
355 #define EXT4_NDIR_BLOCKS 12
356 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
357 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
358 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
359 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
364 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
365 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
366 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
367 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
368 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
369 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
370 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
371 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
372 /* Reserved for compression usage... */
373 #define EXT4_DIRTY_FL 0x00000100
374 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
375 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
376 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
377 /* End compression flags --- maybe not all used */
378 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
379 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
380 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
381 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
382 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
383 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
384 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
385 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
386 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
387 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
388 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
389 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
391 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
392 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
394 /* Flags that should be inherited by new inodes from their parent. */
395 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
396 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
397 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
398 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
400 /* Flags that are appropriate for regular files (all but dir-specific ones). */
401 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
403 /* Flags that are appropriate for non-directories/regular files. */
404 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
406 /* Mask out flags that are inappropriate for the given type of inode. */
407 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
411 else if (S_ISREG(mode))
412 return flags & EXT4_REG_FLMASK;
414 return flags & EXT4_OTHER_FLMASK;
418 * Inode flags used for atomic set/get
421 EXT4_INODE_SECRM = 0, /* Secure deletion */
422 EXT4_INODE_UNRM = 1, /* Undelete */
423 EXT4_INODE_COMPR = 2, /* Compress file */
424 EXT4_INODE_SYNC = 3, /* Synchronous updates */
425 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
426 EXT4_INODE_APPEND = 5, /* writes to file may only append */
427 EXT4_INODE_NODUMP = 6, /* do not dump file */
428 EXT4_INODE_NOATIME = 7, /* do not update atime */
429 /* Reserved for compression usage... */
430 EXT4_INODE_DIRTY = 8,
431 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
432 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
433 EXT4_INODE_ECOMPR = 11, /* Compression error */
434 /* End compression flags --- maybe not all used */
435 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
436 EXT4_INODE_IMAGIC = 13, /* AFS directory */
437 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
438 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
439 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
440 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
441 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
442 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
443 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
444 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
445 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
446 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
450 * Since it's pretty easy to mix up bit numbers and hex values, we use a
451 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
452 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
453 * any extra space in the compiled kernel image, otherwise, the build will fail.
454 * It's important that these values are the same, since we are using
455 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
456 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
457 * values found in ext2, ext3 and ext4 filesystems, and of course the values
458 * defined in e2fsprogs.
460 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
462 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
463 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
465 static inline void ext4_check_flag_values(void)
467 CHECK_FLAG_VALUE(SECRM);
468 CHECK_FLAG_VALUE(UNRM);
469 CHECK_FLAG_VALUE(COMPR);
470 CHECK_FLAG_VALUE(SYNC);
471 CHECK_FLAG_VALUE(IMMUTABLE);
472 CHECK_FLAG_VALUE(APPEND);
473 CHECK_FLAG_VALUE(NODUMP);
474 CHECK_FLAG_VALUE(NOATIME);
475 CHECK_FLAG_VALUE(DIRTY);
476 CHECK_FLAG_VALUE(COMPRBLK);
477 CHECK_FLAG_VALUE(NOCOMPR);
478 CHECK_FLAG_VALUE(ECOMPR);
479 CHECK_FLAG_VALUE(INDEX);
480 CHECK_FLAG_VALUE(IMAGIC);
481 CHECK_FLAG_VALUE(JOURNAL_DATA);
482 CHECK_FLAG_VALUE(NOTAIL);
483 CHECK_FLAG_VALUE(DIRSYNC);
484 CHECK_FLAG_VALUE(TOPDIR);
485 CHECK_FLAG_VALUE(HUGE_FILE);
486 CHECK_FLAG_VALUE(EXTENTS);
487 CHECK_FLAG_VALUE(EA_INODE);
488 CHECK_FLAG_VALUE(EOFBLOCKS);
489 CHECK_FLAG_VALUE(INLINE_DATA);
490 CHECK_FLAG_VALUE(RESERVED);
493 /* Used to pass group descriptor data when online resize is done */
494 struct ext4_new_group_input {
495 __u32 group; /* Group number for this data */
496 __u64 block_bitmap; /* Absolute block number of block bitmap */
497 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
498 __u64 inode_table; /* Absolute block number of inode table start */
499 __u32 blocks_count; /* Total number of blocks in this group */
500 __u16 reserved_blocks; /* Number of reserved blocks in this group */
504 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
505 struct compat_ext4_new_group_input {
507 compat_u64 block_bitmap;
508 compat_u64 inode_bitmap;
509 compat_u64 inode_table;
516 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
517 struct ext4_new_group_data {
523 __u16 reserved_blocks;
525 __u32 free_blocks_count;
528 /* Indexes used to index group tables in ext4_new_group_data */
530 BLOCK_BITMAP = 0, /* block bitmap */
531 INODE_BITMAP, /* inode bitmap */
532 INODE_TABLE, /* inode tables */
537 * Flags used by ext4_map_blocks()
539 /* Allocate any needed blocks and/or convert an unitialized
540 extent to be an initialized ext4 */
541 #define EXT4_GET_BLOCKS_CREATE 0x0001
542 /* Request the creation of an unitialized extent */
543 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
544 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
545 EXT4_GET_BLOCKS_CREATE)
546 /* Caller is from the delayed allocation writeout path
547 * finally doing the actual allocation of delayed blocks */
548 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
549 /* caller is from the direct IO path, request to creation of an
550 unitialized extents if not allocated, split the uninitialized
551 extent if blocks has been preallocated already*/
552 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
553 #define EXT4_GET_BLOCKS_CONVERT 0x0010
554 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
555 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
556 /* Convert extent to initialized after IO complete */
557 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
558 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
559 /* Eventual metadata allocation (due to growing extent tree)
560 * should not fail, so try to use reserved blocks for that.*/
561 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
562 /* Don't normalize allocation size (used for fallocate) */
563 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
564 /* Request will not result in inode size update (user for fallocate) */
565 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
566 /* Do not take i_data_sem locking in ext4_map_blocks */
567 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
568 /* Do not put hole in extent cache */
569 #define EXT4_GET_BLOCKS_NO_PUT_HOLE 0x0200
570 /* Convert written extents to unwritten */
571 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0400
574 * The bit position of these flags must not overlap with any of the
575 * EXT4_GET_BLOCKS_*. They are used by ext4_ext_find_extent(),
576 * read_extent_tree_block(), ext4_split_extent_at(),
577 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
578 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
579 * caching the extents when reading from the extent tree while a
580 * truncate or punch hole operation is in progress.
582 #define EXT4_EX_NOCACHE 0x0400
583 #define EXT4_EX_FORCE_CACHE 0x0800
586 * Flags used by ext4_free_blocks
588 #define EXT4_FREE_BLOCKS_METADATA 0x0001
589 #define EXT4_FREE_BLOCKS_FORGET 0x0002
590 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
591 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
592 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
593 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
594 #define EXT4_FREE_BLOCKS_RESERVE 0x0040
599 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
600 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
601 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
602 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
603 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
604 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
605 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
606 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
607 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
608 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
609 #define EXT4_IOC_MIGRATE _IO('f', 9)
610 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
611 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
612 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
613 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
614 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
615 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
616 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
620 * ioctl commands in 32 bit emulation
622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
634 /* Max physical block we can address w/o extents */
635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
638 * Structure of an inode on the disk
641 __le16 i_mode; /* File mode */
642 __le16 i_uid; /* Low 16 bits of Owner Uid */
643 __le32 i_size_lo; /* Size in bytes */
644 __le32 i_atime; /* Access time */
645 __le32 i_ctime; /* Inode Change time */
646 __le32 i_mtime; /* Modification time */
647 __le32 i_dtime; /* Deletion Time */
648 __le16 i_gid; /* Low 16 bits of Group Id */
649 __le16 i_links_count; /* Links count */
650 __le32 i_blocks_lo; /* Blocks count */
651 __le32 i_flags; /* File flags */
657 __u32 h_i_translator;
662 } osd1; /* OS dependent 1 */
663 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
664 __le32 i_generation; /* File version (for NFS) */
665 __le32 i_file_acl_lo; /* File ACL */
667 __le32 i_obso_faddr; /* Obsoleted fragment address */
670 __le16 l_i_blocks_high; /* were l_i_reserved1 */
671 __le16 l_i_file_acl_high;
672 __le16 l_i_uid_high; /* these 2 fields */
673 __le16 l_i_gid_high; /* were reserved2[0] */
674 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
678 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
685 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
686 __le16 m_i_file_acl_high;
687 __u32 m_i_reserved2[2];
689 } osd2; /* OS dependent 2 */
690 __le16 i_extra_isize;
691 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
692 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
693 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
694 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
695 __le32 i_crtime; /* File Creation time */
696 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
697 __le32 i_version_hi; /* high 32 bits for 64-bit version */
701 __u32 reserved; /* should be zero */
702 __u32 donor_fd; /* donor file descriptor */
703 __u64 orig_start; /* logical start offset in block for orig */
704 __u64 donor_start; /* logical start offset in block for donor */
705 __u64 len; /* block length to be moved */
706 __u64 moved_len; /* moved block length */
709 #define EXT4_EPOCH_BITS 2
710 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
711 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
714 * Extended fields will fit into an inode if the filesystem was formatted
715 * with large inodes (-I 256 or larger) and there are not currently any EAs
716 * consuming all of the available space. For new inodes we always reserve
717 * enough space for the kernel's known extended fields, but for inodes
718 * created with an old kernel this might not have been the case. None of
719 * the extended inode fields is critical for correct filesystem operation.
720 * This macro checks if a certain field fits in the inode. Note that
721 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
723 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
724 ((offsetof(typeof(*ext4_inode), field) + \
725 sizeof((ext4_inode)->field)) \
726 <= (EXT4_GOOD_OLD_INODE_SIZE + \
727 (einode)->i_extra_isize)) \
729 static inline __le32 ext4_encode_extra_time(struct timespec *time)
731 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
732 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
733 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
736 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
738 if (sizeof(time->tv_sec) > 4)
739 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
741 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
744 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
746 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
747 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
748 (raw_inode)->xtime ## _extra = \
749 ext4_encode_extra_time(&(inode)->xtime); \
752 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
754 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
755 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
756 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
757 (raw_inode)->xtime ## _extra = \
758 ext4_encode_extra_time(&(einode)->xtime); \
761 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
763 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
764 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
765 ext4_decode_extra_time(&(inode)->xtime, \
766 raw_inode->xtime ## _extra); \
768 (inode)->xtime.tv_nsec = 0; \
771 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
773 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
774 (einode)->xtime.tv_sec = \
775 (signed)le32_to_cpu((raw_inode)->xtime); \
777 (einode)->xtime.tv_sec = 0; \
778 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
779 ext4_decode_extra_time(&(einode)->xtime, \
780 raw_inode->xtime ## _extra); \
782 (einode)->xtime.tv_nsec = 0; \
785 #define i_disk_version osd1.linux1.l_i_version
787 #if defined(__KERNEL__) || defined(__linux__)
788 #define i_reserved1 osd1.linux1.l_i_reserved1
789 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
790 #define i_blocks_high osd2.linux2.l_i_blocks_high
791 #define i_uid_low i_uid
792 #define i_gid_low i_gid
793 #define i_uid_high osd2.linux2.l_i_uid_high
794 #define i_gid_high osd2.linux2.l_i_gid_high
795 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
797 #elif defined(__GNU__)
799 #define i_translator osd1.hurd1.h_i_translator
800 #define i_uid_high osd2.hurd2.h_i_uid_high
801 #define i_gid_high osd2.hurd2.h_i_gid_high
802 #define i_author osd2.hurd2.h_i_author
804 #elif defined(__masix__)
806 #define i_reserved1 osd1.masix1.m_i_reserved1
807 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
808 #define i_reserved2 osd2.masix2.m_i_reserved2
810 #endif /* defined(__KERNEL__) || defined(__linux__) */
812 #include "extents_status.h"
815 * fourth extended file system inode data in memory
817 struct ext4_inode_info {
818 __le32 i_data[15]; /* unconverted */
820 ext4_fsblk_t i_file_acl;
823 * i_block_group is the number of the block group which contains
824 * this file's inode. Constant across the lifetime of the inode,
825 * it is ued for making block allocation decisions - we try to
826 * place a file's data blocks near its inode block, and new inodes
827 * near to their parent directory's inode.
829 ext4_group_t i_block_group;
830 ext4_lblk_t i_dir_start_lookup;
831 #if (BITS_PER_LONG < 64)
832 unsigned long i_state_flags; /* Dynamic state flags */
834 unsigned long i_flags;
837 * Extended attributes can be read independently of the main file
838 * data. Taking i_mutex even when reading would cause contention
839 * between readers of EAs and writers of regular file data, so
840 * instead we synchronize on xattr_sem when reading or changing
843 struct rw_semaphore xattr_sem;
845 struct list_head i_orphan; /* unlinked but open inodes */
848 * i_disksize keeps track of what the inode size is ON DISK, not
849 * in memory. During truncate, i_size is set to the new size by
850 * the VFS prior to calling ext4_truncate(), but the filesystem won't
851 * set i_disksize to 0 until the truncate is actually under way.
853 * The intent is that i_disksize always represents the blocks which
854 * are used by this file. This allows recovery to restart truncate
855 * on orphans if we crash during truncate. We actually write i_disksize
856 * into the on-disk inode when writing inodes out, instead of i_size.
858 * The only time when i_disksize and i_size may be different is when
859 * a truncate is in progress. The only things which change i_disksize
860 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
865 * i_data_sem is for serialising ext4_truncate() against
866 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
867 * data tree are chopped off during truncate. We can't do that in
868 * ext4 because whenever we perform intermediate commits during
869 * truncate, the inode and all the metadata blocks *must* be in a
870 * consistent state which allows truncation of the orphans to restart
871 * during recovery. Hence we must fix the get_block-vs-truncate race
872 * by other means, so we have i_data_sem.
874 struct rw_semaphore i_data_sem;
875 struct inode vfs_inode;
876 struct jbd2_inode *jinode;
879 * File creation time. Its function is same as that of
880 * struct timespec i_{a,c,m}time in the generic inode.
882 struct timespec i_crtime;
885 struct list_head i_prealloc_list;
886 spinlock_t i_prealloc_lock;
888 /* extents status tree */
889 struct ext4_es_tree i_es_tree;
891 struct list_head i_es_lru;
892 unsigned int i_es_lru_nr; /* protected by i_es_lock */
893 unsigned long i_touch_when; /* jiffies of last accessing */
896 ext4_group_t i_last_alloc_group;
898 /* allocation reservation info for delalloc */
899 /* In case of bigalloc, these refer to clusters rather than blocks */
900 unsigned int i_reserved_data_blocks;
901 unsigned int i_reserved_meta_blocks;
902 unsigned int i_allocated_meta_blocks;
903 ext4_lblk_t i_da_metadata_calc_last_lblock;
904 int i_da_metadata_calc_len;
906 /* on-disk additional length */
909 /* Indicate the inline data space. */
914 /* quota space reservation, managed internally by quota code */
915 qsize_t i_reserved_quota;
918 /* Lock protecting lists below */
919 spinlock_t i_completed_io_lock;
921 * Completed IOs that need unwritten extents handling and have
922 * transaction reserved
924 struct list_head i_rsv_conversion_list;
926 * Completed IOs that need unwritten extents handling and don't have
927 * transaction reserved
929 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
930 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
931 struct work_struct i_rsv_conversion_work;
933 spinlock_t i_block_reservation_lock;
936 * Transactions that contain inode's metadata needed to complete
937 * fsync and fdatasync, respectively.
940 tid_t i_datasync_tid;
942 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
949 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
950 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
951 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
954 * Misc. filesystem flags
956 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
957 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
958 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
961 * Mount flags set via mount options or defaults
963 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
964 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
965 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
966 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
967 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
968 #define EXT4_MOUNT_ERRORS_MASK 0x00070
969 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
970 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
971 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
972 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
973 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
974 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
975 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
976 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
977 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
978 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
979 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
980 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
981 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
982 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
983 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
984 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
985 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
986 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
987 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
988 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
989 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
990 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
991 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
994 * Mount flags set either automatically (could not be set by mount option)
995 * based on per file system feature or property or in special cases such as
996 * distinguishing between explicit mount option definition and default.
998 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
999 specified delalloc */
1000 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
1001 size of blocksize * 8
1003 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
1006 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
1008 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1010 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1013 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1015 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1017 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1020 #define ext4_test_and_set_bit __test_and_set_bit_le
1021 #define ext4_set_bit __set_bit_le
1022 #define ext4_set_bit_atomic ext2_set_bit_atomic
1023 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1024 #define ext4_clear_bit __clear_bit_le
1025 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1026 #define ext4_test_bit test_bit_le
1027 #define ext4_find_next_zero_bit find_next_zero_bit_le
1028 #define ext4_find_next_bit find_next_bit_le
1030 extern void ext4_set_bits(void *bm, int cur, int len);
1033 * Maximal mount counts between two filesystem checks
1035 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1036 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1039 * Behaviour when detecting errors
1041 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1042 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1043 #define EXT4_ERRORS_PANIC 3 /* Panic */
1044 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1046 /* Metadata checksum algorithm codes */
1047 #define EXT4_CRC32C_CHKSUM 1
1050 * Structure of the super block
1052 struct ext4_super_block {
1053 /*00*/ __le32 s_inodes_count; /* Inodes count */
1054 __le32 s_blocks_count_lo; /* Blocks count */
1055 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1056 __le32 s_free_blocks_count_lo; /* Free blocks count */
1057 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1058 __le32 s_first_data_block; /* First Data Block */
1059 __le32 s_log_block_size; /* Block size */
1060 __le32 s_log_cluster_size; /* Allocation cluster size */
1061 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1062 __le32 s_clusters_per_group; /* # Clusters per group */
1063 __le32 s_inodes_per_group; /* # Inodes per group */
1064 __le32 s_mtime; /* Mount time */
1065 /*30*/ __le32 s_wtime; /* Write time */
1066 __le16 s_mnt_count; /* Mount count */
1067 __le16 s_max_mnt_count; /* Maximal mount count */
1068 __le16 s_magic; /* Magic signature */
1069 __le16 s_state; /* File system state */
1070 __le16 s_errors; /* Behaviour when detecting errors */
1071 __le16 s_minor_rev_level; /* minor revision level */
1072 /*40*/ __le32 s_lastcheck; /* time of last check */
1073 __le32 s_checkinterval; /* max. time between checks */
1074 __le32 s_creator_os; /* OS */
1075 __le32 s_rev_level; /* Revision level */
1076 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1077 __le16 s_def_resgid; /* Default gid for reserved blocks */
1079 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1081 * Note: the difference between the compatible feature set and
1082 * the incompatible feature set is that if there is a bit set
1083 * in the incompatible feature set that the kernel doesn't
1084 * know about, it should refuse to mount the filesystem.
1086 * e2fsck's requirements are more strict; if it doesn't know
1087 * about a feature in either the compatible or incompatible
1088 * feature set, it must abort and not try to meddle with
1089 * things it doesn't understand...
1091 __le32 s_first_ino; /* First non-reserved inode */
1092 __le16 s_inode_size; /* size of inode structure */
1093 __le16 s_block_group_nr; /* block group # of this superblock */
1094 __le32 s_feature_compat; /* compatible feature set */
1095 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1096 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1097 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1098 /*78*/ char s_volume_name[16]; /* volume name */
1099 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1100 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1102 * Performance hints. Directory preallocation should only
1103 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1105 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1106 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1107 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1109 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1111 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1112 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1113 __le32 s_journal_dev; /* device number of journal file */
1114 __le32 s_last_orphan; /* start of list of inodes to delete */
1115 __le32 s_hash_seed[4]; /* HTREE hash seed */
1116 __u8 s_def_hash_version; /* Default hash version to use */
1117 __u8 s_jnl_backup_type;
1118 __le16 s_desc_size; /* size of group descriptor */
1119 /*100*/ __le32 s_default_mount_opts;
1120 __le32 s_first_meta_bg; /* First metablock block group */
1121 __le32 s_mkfs_time; /* When the filesystem was created */
1122 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1123 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1124 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1125 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1126 __le32 s_free_blocks_count_hi; /* Free blocks count */
1127 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1128 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1129 __le32 s_flags; /* Miscellaneous flags */
1130 __le16 s_raid_stride; /* RAID stride */
1131 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1132 __le64 s_mmp_block; /* Block for multi-mount protection */
1133 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1134 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1135 __u8 s_checksum_type; /* metadata checksum algorithm used */
1136 __le16 s_reserved_pad;
1137 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1138 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1139 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1140 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1141 snapshot's future use */
1142 __le32 s_snapshot_list; /* inode number of the head of the
1143 on-disk snapshot list */
1144 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1145 __le32 s_error_count; /* number of fs errors */
1146 __le32 s_first_error_time; /* first time an error happened */
1147 __le32 s_first_error_ino; /* inode involved in first error */
1148 __le64 s_first_error_block; /* block involved of first error */
1149 __u8 s_first_error_func[32]; /* function where the error happened */
1150 __le32 s_first_error_line; /* line number where error happened */
1151 __le32 s_last_error_time; /* most recent time of an error */
1152 __le32 s_last_error_ino; /* inode involved in last error */
1153 __le32 s_last_error_line; /* line number where error happened */
1154 __le64 s_last_error_block; /* block involved of last error */
1155 __u8 s_last_error_func[32]; /* function where the error happened */
1156 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1157 __u8 s_mount_opts[64];
1158 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1159 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1160 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1161 __le32 s_reserved[108]; /* Padding to the end of the block */
1162 __le32 s_checksum; /* crc32c(superblock) */
1165 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1170 * run-time mount flags
1172 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1173 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1176 * fourth extended-fs super-block data in memory
1178 struct ext4_sb_info {
1179 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1180 unsigned long s_inodes_per_block;/* Number of inodes per block */
1181 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1182 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1183 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1184 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1185 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1186 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1187 ext4_group_t s_groups_count; /* Number of groups in the fs */
1188 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1189 unsigned long s_overhead; /* # of fs overhead clusters */
1190 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1191 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1192 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1193 struct buffer_head * s_sbh; /* Buffer containing the super block */
1194 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1195 struct buffer_head **s_group_desc;
1196 unsigned int s_mount_opt;
1197 unsigned int s_mount_opt2;
1198 unsigned int s_mount_flags;
1199 unsigned int s_def_mount_opt;
1200 ext4_fsblk_t s_sb_block;
1201 atomic64_t s_resv_clusters;
1204 unsigned short s_mount_state;
1205 unsigned short s_pad;
1206 int s_addr_per_block_bits;
1207 int s_desc_per_block_bits;
1210 unsigned int s_inode_readahead_blks;
1211 unsigned int s_inode_goal;
1212 spinlock_t s_next_gen_lock;
1213 u32 s_next_generation;
1215 int s_def_hash_version;
1216 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1217 struct percpu_counter s_freeclusters_counter;
1218 struct percpu_counter s_freeinodes_counter;
1219 struct percpu_counter s_dirs_counter;
1220 struct percpu_counter s_dirtyclusters_counter;
1221 struct blockgroup_lock *s_blockgroup_lock;
1222 struct proc_dir_entry *s_proc;
1223 struct kobject s_kobj;
1224 struct completion s_kobj_unregister;
1225 struct super_block *s_sb;
1228 struct journal_s *s_journal;
1229 struct list_head s_orphan;
1230 struct mutex s_orphan_lock;
1231 unsigned long s_resize_flags; /* Flags indicating if there
1233 unsigned long s_commit_interval;
1234 u32 s_max_batch_time;
1235 u32 s_min_batch_time;
1236 struct block_device *journal_bdev;
1238 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
1239 int s_jquota_fmt; /* Format of quota to use */
1241 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1242 struct rb_root system_blks;
1244 #ifdef EXTENTS_STATS
1245 /* ext4 extents stats */
1246 unsigned long s_ext_min;
1247 unsigned long s_ext_max;
1248 unsigned long s_depth_max;
1249 spinlock_t s_ext_stats_lock;
1250 unsigned long s_ext_blocks;
1251 unsigned long s_ext_extents;
1254 /* for buddy allocator */
1255 struct ext4_group_info ***s_group_info;
1256 struct inode *s_buddy_cache;
1257 spinlock_t s_md_lock;
1258 unsigned short *s_mb_offsets;
1259 unsigned int *s_mb_maxs;
1260 unsigned int s_group_info_size;
1263 unsigned long s_stripe;
1264 unsigned int s_mb_stream_request;
1265 unsigned int s_mb_max_to_scan;
1266 unsigned int s_mb_min_to_scan;
1267 unsigned int s_mb_stats;
1268 unsigned int s_mb_order2_reqs;
1269 unsigned int s_mb_group_prealloc;
1270 unsigned int s_max_dir_size_kb;
1271 /* where last allocation was done - for stream allocation */
1272 unsigned long s_mb_last_group;
1273 unsigned long s_mb_last_start;
1275 /* stats for buddy allocator */
1276 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1277 atomic_t s_bal_success; /* we found long enough chunks */
1278 atomic_t s_bal_allocated; /* in blocks */
1279 atomic_t s_bal_ex_scanned; /* total extents scanned */
1280 atomic_t s_bal_goals; /* goal hits */
1281 atomic_t s_bal_breaks; /* too long searches */
1282 atomic_t s_bal_2orders; /* 2^order hits */
1283 spinlock_t s_bal_lock;
1284 unsigned long s_mb_buddies_generated;
1285 unsigned long long s_mb_generation_time;
1286 atomic_t s_mb_lost_chunks;
1287 atomic_t s_mb_preallocated;
1288 atomic_t s_mb_discarded;
1289 atomic_t s_lock_busy;
1291 /* locality groups */
1292 struct ext4_locality_group __percpu *s_locality_groups;
1294 /* for write statistics */
1295 unsigned long s_sectors_written_start;
1296 u64 s_kbytes_written;
1298 /* the size of zero-out chunk */
1299 unsigned int s_extent_max_zeroout_kb;
1301 unsigned int s_log_groups_per_flex;
1302 struct flex_groups *s_flex_groups;
1303 ext4_group_t s_flex_groups_allocated;
1305 /* workqueue for reserved extent conversions (buffered io) */
1306 struct workqueue_struct *rsv_conversion_wq;
1308 /* timer for periodic error stats printing */
1309 struct timer_list s_err_report;
1311 /* Lazy inode table initialization info */
1312 struct ext4_li_request *s_li_request;
1313 /* Wait multiplier for lazy initialization thread */
1314 unsigned int s_li_wait_mult;
1316 /* Kernel thread for multiple mount protection */
1317 struct task_struct *s_mmp_tsk;
1319 /* record the last minlen when FITRIM is called. */
1320 atomic_t s_last_trim_minblks;
1322 /* Reference to checksum algorithm driver via cryptoapi */
1323 struct crypto_shash *s_chksum_driver;
1325 /* Precomputed FS UUID checksum for seeding other checksums */
1328 /* Reclaim extents from extent status tree */
1329 struct shrinker s_es_shrinker;
1330 struct list_head s_es_lru;
1331 unsigned long s_es_last_sorted;
1332 struct percpu_counter s_extent_cache_cnt;
1333 struct mb_cache *s_mb_cache;
1334 spinlock_t s_es_lru_lock ____cacheline_aligned_in_smp;
1336 /* Ratelimit ext4 messages. */
1337 struct ratelimit_state s_err_ratelimit_state;
1338 struct ratelimit_state s_warning_ratelimit_state;
1339 struct ratelimit_state s_msg_ratelimit_state;
1342 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1344 return sb->s_fs_info;
1346 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1348 return container_of(inode, struct ext4_inode_info, vfs_inode);
1351 static inline struct timespec ext4_current_time(struct inode *inode)
1353 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1354 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1357 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1359 return ino == EXT4_ROOT_INO ||
1360 ino == EXT4_USR_QUOTA_INO ||
1361 ino == EXT4_GRP_QUOTA_INO ||
1362 ino == EXT4_BOOT_LOADER_INO ||
1363 ino == EXT4_JOURNAL_INO ||
1364 ino == EXT4_RESIZE_INO ||
1365 (ino >= EXT4_FIRST_INO(sb) &&
1366 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1369 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1370 struct ext4_io_end *io_end)
1372 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1373 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1374 atomic_inc(&EXT4_I(inode)->i_unwritten);
1378 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1380 return inode->i_private;
1383 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1385 inode->i_private = io;
1389 * Inode dynamic state flags
1392 EXT4_STATE_JDATA, /* journaled data exists */
1393 EXT4_STATE_NEW, /* inode is newly created */
1394 EXT4_STATE_XATTR, /* has in-inode xattrs */
1395 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1396 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1397 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1398 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1399 EXT4_STATE_NEWENTRY, /* File just added to dir */
1400 EXT4_STATE_DELALLOC_RESERVED, /* blks already reserved for delalloc */
1401 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1403 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1404 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1405 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1408 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1409 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1411 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1413 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1415 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1417 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1419 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1422 /* Add these declarations here only so that these functions can be
1423 * found by name. Otherwise, they are very hard to locate. */
1424 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1425 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1426 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1427 EXT4_INODE_BIT_FNS(flag, flags, 0)
1429 /* Add these declarations here only so that these functions can be
1430 * found by name. Otherwise, they are very hard to locate. */
1431 static inline int ext4_test_inode_state(struct inode *inode, int bit);
1432 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1433 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1434 #if (BITS_PER_LONG < 64)
1435 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1437 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1439 (ei)->i_state_flags = 0;
1442 EXT4_INODE_BIT_FNS(state, flags, 32)
1444 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1446 /* We depend on the fact that callers will set i_flags */
1450 /* Assume that user mode programs are passing in an ext4fs superblock, not
1451 * a kernel struct super_block. This will allow us to call the feature-test
1452 * macros from user land. */
1453 #define EXT4_SB(sb) (sb)
1456 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1459 * Codes for operating systems
1461 #define EXT4_OS_LINUX 0
1462 #define EXT4_OS_HURD 1
1463 #define EXT4_OS_MASIX 2
1464 #define EXT4_OS_FREEBSD 3
1465 #define EXT4_OS_LITES 4
1470 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1471 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1473 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1474 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1476 #define EXT4_GOOD_OLD_INODE_SIZE 128
1479 * Feature set definitions
1482 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1483 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1484 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1485 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1486 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1487 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1488 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1489 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1490 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1491 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1492 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1493 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1494 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1495 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1496 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1497 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1498 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1499 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1501 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1502 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1503 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1504 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1505 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1506 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1508 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1509 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1510 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1511 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1512 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1513 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1514 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1515 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1516 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1518 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1519 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1520 * all other data structures' checksums. However, the METADATA_CSUM and
1521 * GDT_CSUM bits are mutually exclusive.
1523 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1525 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1526 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1527 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1528 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1529 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1530 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1531 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1532 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1533 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1534 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1535 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1536 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1537 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1538 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1540 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1541 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1542 EXT4_FEATURE_INCOMPAT_META_BG)
1543 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1544 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1545 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1547 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1548 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1549 EXT4_FEATURE_INCOMPAT_RECOVER| \
1550 EXT4_FEATURE_INCOMPAT_META_BG)
1551 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1552 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1553 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1555 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1556 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1557 EXT4_FEATURE_INCOMPAT_RECOVER| \
1558 EXT4_FEATURE_INCOMPAT_META_BG| \
1559 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1560 EXT4_FEATURE_INCOMPAT_64BIT| \
1561 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1562 EXT4_FEATURE_INCOMPAT_MMP | \
1563 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1564 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1565 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1566 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1567 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1568 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1569 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1570 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1571 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1572 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1573 EXT4_FEATURE_RO_COMPAT_QUOTA)
1576 * Default values for user and/or group using reserved blocks
1578 #define EXT4_DEF_RESUID 0
1579 #define EXT4_DEF_RESGID 0
1581 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1584 * Default mount options
1586 #define EXT4_DEFM_DEBUG 0x0001
1587 #define EXT4_DEFM_BSDGROUPS 0x0002
1588 #define EXT4_DEFM_XATTR_USER 0x0004
1589 #define EXT4_DEFM_ACL 0x0008
1590 #define EXT4_DEFM_UID16 0x0010
1591 #define EXT4_DEFM_JMODE 0x0060
1592 #define EXT4_DEFM_JMODE_DATA 0x0020
1593 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1594 #define EXT4_DEFM_JMODE_WBACK 0x0060
1595 #define EXT4_DEFM_NOBARRIER 0x0100
1596 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1597 #define EXT4_DEFM_DISCARD 0x0400
1598 #define EXT4_DEFM_NODELALLOC 0x0800
1601 * Default journal batch times
1603 #define EXT4_DEF_MIN_BATCH_TIME 0
1604 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1607 * Minimum number of groups in a flexgroup before we separate out
1608 * directories into the first block group of a flexgroup
1610 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1613 * Structure of a directory entry
1615 #define EXT4_NAME_LEN 255
1617 struct ext4_dir_entry {
1618 __le32 inode; /* Inode number */
1619 __le16 rec_len; /* Directory entry length */
1620 __le16 name_len; /* Name length */
1621 char name[EXT4_NAME_LEN]; /* File name */
1625 * The new version of the directory entry. Since EXT4 structures are
1626 * stored in intel byte order, and the name_len field could never be
1627 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1630 struct ext4_dir_entry_2 {
1631 __le32 inode; /* Inode number */
1632 __le16 rec_len; /* Directory entry length */
1633 __u8 name_len; /* Name length */
1635 char name[EXT4_NAME_LEN]; /* File name */
1639 * This is a bogus directory entry at the end of each leaf block that
1640 * records checksums.
1642 struct ext4_dir_entry_tail {
1643 __le32 det_reserved_zero1; /* Pretend to be unused */
1644 __le16 det_rec_len; /* 12 */
1645 __u8 det_reserved_zero2; /* Zero name length */
1646 __u8 det_reserved_ft; /* 0xDE, fake file type */
1647 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1650 #define EXT4_DIRENT_TAIL(block, blocksize) \
1651 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1653 sizeof(struct ext4_dir_entry_tail))))
1656 * Ext4 directory file types. Only the low 3 bits are used. The
1657 * other bits are reserved for now.
1659 #define EXT4_FT_UNKNOWN 0
1660 #define EXT4_FT_REG_FILE 1
1661 #define EXT4_FT_DIR 2
1662 #define EXT4_FT_CHRDEV 3
1663 #define EXT4_FT_BLKDEV 4
1664 #define EXT4_FT_FIFO 5
1665 #define EXT4_FT_SOCK 6
1666 #define EXT4_FT_SYMLINK 7
1668 #define EXT4_FT_MAX 8
1670 #define EXT4_FT_DIR_CSUM 0xDE
1673 * EXT4_DIR_PAD defines the directory entries boundaries
1675 * NOTE: It must be a multiple of 4
1677 #define EXT4_DIR_PAD 4
1678 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1679 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1681 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1684 * If we ever get support for fs block sizes > page_size, we'll need
1685 * to remove the #if statements in the next two functions...
1687 static inline unsigned int
1688 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1690 unsigned len = le16_to_cpu(dlen);
1692 #if (PAGE_CACHE_SIZE >= 65536)
1693 if (len == EXT4_MAX_REC_LEN || len == 0)
1695 return (len & 65532) | ((len & 3) << 16);
1701 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1703 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1705 #if (PAGE_CACHE_SIZE >= 65536)
1707 return cpu_to_le16(len);
1708 if (len == blocksize) {
1709 if (blocksize == 65536)
1710 return cpu_to_le16(EXT4_MAX_REC_LEN);
1712 return cpu_to_le16(0);
1714 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1716 return cpu_to_le16(len);
1721 * Hash Tree Directory indexing
1722 * (c) Daniel Phillips, 2001
1725 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1726 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1727 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1728 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1729 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1731 /* Legal values for the dx_root hash_version field: */
1733 #define DX_HASH_LEGACY 0
1734 #define DX_HASH_HALF_MD4 1
1735 #define DX_HASH_TEA 2
1736 #define DX_HASH_LEGACY_UNSIGNED 3
1737 #define DX_HASH_HALF_MD4_UNSIGNED 4
1738 #define DX_HASH_TEA_UNSIGNED 5
1740 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1741 const void *address, unsigned int length)
1744 struct shash_desc shash;
1749 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1751 desc.shash.tfm = sbi->s_chksum_driver;
1752 desc.shash.flags = 0;
1753 *(u32 *)desc.ctx = crc;
1755 err = crypto_shash_update(&desc.shash, address, length);
1758 return *(u32 *)desc.ctx;
1763 /* hash info structure used by the directory hash */
1773 /* 32 and 64 bit signed EOF for dx directories */
1774 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1775 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1779 * Control parameters used by ext4_htree_next_block
1781 #define HASH_NB_ALWAYS 1
1785 * Describe an inode's exact location on disk and in memory
1789 struct buffer_head *bh;
1790 unsigned long offset;
1791 ext4_group_t block_group;
1794 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1796 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1800 * This structure is stuffed into the struct file's private_data field
1801 * for directories. It is where we put information so that we can do
1802 * readdir operations in hash tree order.
1804 struct dir_private_info {
1805 struct rb_root root;
1806 struct rb_node *curr_node;
1807 struct fname *extra_fname;
1810 __u32 curr_minor_hash;
1814 /* calculate the first block number of the group */
1815 static inline ext4_fsblk_t
1816 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1818 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1819 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1823 * Special error return code only used by dx_probe() and its callers.
1825 #define ERR_BAD_DX_DIR -75000
1828 * Timeout and state flag for lazy initialization inode thread.
1830 #define EXT4_DEF_LI_WAIT_MULT 10
1831 #define EXT4_DEF_LI_MAX_START_DELAY 5
1832 #define EXT4_LAZYINIT_QUIT 0x0001
1833 #define EXT4_LAZYINIT_RUNNING 0x0002
1836 * Lazy inode table initialization info
1838 struct ext4_lazy_init {
1839 unsigned long li_state;
1840 struct list_head li_request_list;
1841 struct mutex li_list_mtx;
1844 struct ext4_li_request {
1845 struct super_block *lr_super;
1846 struct ext4_sb_info *lr_sbi;
1847 ext4_group_t lr_next_group;
1848 struct list_head lr_request;
1849 unsigned long lr_next_sched;
1850 unsigned long lr_timeout;
1853 struct ext4_features {
1854 struct kobject f_kobj;
1855 struct completion f_kobj_unregister;
1859 * This structure will be used for multiple mount protection. It will be
1860 * written into the block number saved in the s_mmp_block field in the
1861 * superblock. Programs that check MMP should assume that if
1862 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1863 * to use the filesystem, regardless of how old the timestamp is.
1865 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1866 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1867 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1868 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1871 __le32 mmp_magic; /* Magic number for MMP */
1872 __le32 mmp_seq; /* Sequence no. updated periodically */
1875 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1876 * purposes and do not affect the correctness of the algorithm
1878 __le64 mmp_time; /* Time last updated */
1879 char mmp_nodename[64]; /* Node which last updated MMP block */
1880 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1883 * mmp_check_interval is used to verify if the MMP block has been
1884 * updated on the block device. The value is updated based on the
1885 * maximum time to write the MMP block during an update cycle.
1887 __le16 mmp_check_interval;
1890 __le32 mmp_pad2[226];
1891 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1894 /* arguments passed to the mmp thread */
1896 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1897 struct super_block *sb; /* super block of the fs */
1901 * Check interval multiplier
1902 * The MMP block is written every update interval and initially checked every
1903 * update interval x the multiplier (the value is then adapted based on the
1904 * write latency). The reason is that writes can be delayed under load and we
1905 * don't want readers to incorrectly assume that the filesystem is no longer
1908 #define EXT4_MMP_CHECK_MULT 2UL
1911 * Minimum interval for MMP checking in seconds.
1913 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1916 * Maximum interval for MMP checking in seconds.
1918 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1921 * Function prototypes
1925 * Ok, these declarations are also in <linux/kernel.h> but none of the
1926 * ext4 source programs needs to include it so they are duplicated here.
1928 # define NORET_TYPE /**/
1929 # define ATTRIB_NORET __attribute__((noreturn))
1930 # define NORET_AND noreturn,
1933 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1934 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1935 struct ext4_group_desc *gdp,
1936 struct buffer_head *bh, int sz);
1937 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1938 struct ext4_group_desc *gdp,
1939 struct buffer_head *bh, int sz);
1940 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1941 struct ext4_group_desc *gdp,
1942 struct buffer_head *bh);
1943 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1944 struct ext4_group_desc *gdp,
1945 struct buffer_head *bh);
1948 extern void ext4_get_group_no_and_offset(struct super_block *sb,
1949 ext4_fsblk_t blocknr,
1950 ext4_group_t *blockgrpp,
1951 ext4_grpblk_t *offsetp);
1952 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1953 ext4_fsblk_t block);
1955 extern void ext4_validate_block_bitmap(struct super_block *sb,
1956 struct ext4_group_desc *desc,
1957 ext4_group_t block_group,
1958 struct buffer_head *bh);
1959 extern unsigned int ext4_block_group(struct super_block *sb,
1960 ext4_fsblk_t blocknr);
1961 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1962 ext4_fsblk_t blocknr);
1963 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1964 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1965 ext4_group_t group);
1966 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1969 unsigned long *count,
1971 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1972 s64 nclusters, unsigned int flags);
1973 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1974 extern void ext4_check_blocks_bitmap(struct super_block *);
1975 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1976 ext4_group_t block_group,
1977 struct buffer_head ** bh);
1978 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1980 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1981 ext4_group_t block_group);
1982 extern int ext4_wait_block_bitmap(struct super_block *sb,
1983 ext4_group_t block_group,
1984 struct buffer_head *bh);
1985 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1986 ext4_group_t block_group);
1987 extern void ext4_init_block_bitmap(struct super_block *sb,
1988 struct buffer_head *bh,
1990 struct ext4_group_desc *desc);
1991 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1992 ext4_group_t block_group,
1993 struct ext4_group_desc *gdp);
1994 extern unsigned ext4_num_overhead_clusters(struct super_block *sb,
1995 ext4_group_t block_group,
1996 struct ext4_group_desc *gdp);
1997 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
2000 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
2002 struct ext4_dir_entry_2 *,
2003 struct buffer_head *, char *, int,
2005 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
2006 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
2007 (de), (bh), (buf), (size), (offset)))
2008 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
2010 struct ext4_dir_entry_2 *dirent);
2011 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
2012 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
2013 struct buffer_head *bh,
2014 void *buf, int buf_size,
2015 const char *name, int namelen,
2016 struct ext4_dir_entry_2 **dest_de);
2017 void ext4_insert_dentry(struct inode *inode,
2018 struct ext4_dir_entry_2 *de,
2020 const char *name, int namelen);
2021 static inline void ext4_update_dx_flag(struct inode *inode)
2023 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2024 EXT4_FEATURE_COMPAT_DIR_INDEX))
2025 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2027 static unsigned char ext4_filetype_table[] = {
2028 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2031 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2033 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2034 (filetype >= EXT4_FT_MAX))
2037 return ext4_filetype_table[filetype];
2041 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2044 extern int ext4fs_dirhash(const char *name, int len, struct
2045 dx_hash_info *hinfo);
2048 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2049 const struct qstr *qstr, __u32 goal,
2050 uid_t *owner, int handle_type,
2051 unsigned int line_no, int nblocks);
2053 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2054 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2056 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2058 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2059 (type), __LINE__, (nblocks))
2062 extern void ext4_free_inode(handle_t *, struct inode *);
2063 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2064 extern unsigned long ext4_count_free_inodes(struct super_block *);
2065 extern unsigned long ext4_count_dirs(struct super_block *);
2066 extern void ext4_check_inodes_bitmap(struct super_block *);
2067 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2068 extern int ext4_init_inode_table(struct super_block *sb,
2069 ext4_group_t group, int barrier);
2070 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2073 extern long ext4_mb_stats;
2074 extern long ext4_mb_max_to_scan;
2075 extern int ext4_mb_init(struct super_block *);
2076 extern int ext4_mb_release(struct super_block *);
2077 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2078 struct ext4_allocation_request *, int *);
2079 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2080 extern void ext4_discard_preallocations(struct inode *);
2081 extern int __init ext4_init_mballoc(void);
2082 extern void ext4_exit_mballoc(void);
2083 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2084 struct buffer_head *bh, ext4_fsblk_t block,
2085 unsigned long count, int flags);
2086 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2087 ext4_group_t ngroups);
2088 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2089 ext4_group_t i, struct ext4_group_desc *desc);
2090 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2091 ext4_fsblk_t block, unsigned long count);
2092 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2095 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
2096 ext4_lblk_t, int, int *);
2097 struct buffer_head *ext4_bread(handle_t *, struct inode *,
2098 ext4_lblk_t, int, int *);
2099 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2100 struct buffer_head *bh_result, int create);
2101 int ext4_get_block(struct inode *inode, sector_t iblock,
2102 struct buffer_head *bh_result, int create);
2103 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2104 struct buffer_head *bh, int create);
2105 int ext4_walk_page_buffers(handle_t *handle,
2106 struct buffer_head *head,
2110 int (*fn)(handle_t *handle,
2111 struct buffer_head *bh));
2112 int do_journal_get_write_access(handle_t *handle,
2113 struct buffer_head *bh);
2114 #define FALL_BACK_TO_NONDELALLOC 1
2115 #define CONVERT_INLINE_DATA 2
2117 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2118 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2119 extern int ext4_setattr(struct dentry *, struct iattr *);
2120 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2121 struct kstat *stat);
2122 extern void ext4_evict_inode(struct inode *);
2123 extern void ext4_clear_inode(struct inode *);
2124 extern int ext4_sync_inode(handle_t *, struct inode *);
2125 extern void ext4_dirty_inode(struct inode *, int);
2126 extern int ext4_change_inode_journal_flag(struct inode *, int);
2127 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2128 extern int ext4_inode_attach_jinode(struct inode *inode);
2129 extern int ext4_can_truncate(struct inode *inode);
2130 extern void ext4_truncate(struct inode *);
2131 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2132 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2133 extern void ext4_set_inode_flags(struct inode *);
2134 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2135 extern int ext4_alloc_da_blocks(struct inode *inode);
2136 extern void ext4_set_aops(struct inode *inode);
2137 extern int ext4_writepage_trans_blocks(struct inode *);
2138 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2139 extern int ext4_block_truncate_page(handle_t *handle,
2140 struct address_space *mapping, loff_t from);
2141 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2142 loff_t lstart, loff_t lend);
2143 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2144 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2145 extern void ext4_da_update_reserve_space(struct inode *inode,
2146 int used, int quota_claim);
2149 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2150 struct ext4_map_blocks *map, int flags);
2151 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2152 const struct iovec *iov, loff_t offset,
2153 unsigned long nr_segs);
2154 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2155 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2156 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2157 extern int ext4_free_hole_blocks(handle_t *handle, struct inode *inode,
2158 ext4_lblk_t first, ext4_lblk_t stop);
2161 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2162 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2165 extern int ext4_ext_migrate(struct inode *);
2166 extern int ext4_ind_migrate(struct inode *inode);
2169 extern int ext4_dirent_csum_verify(struct inode *inode,
2170 struct ext4_dir_entry *dirent);
2171 extern int ext4_orphan_add(handle_t *, struct inode *);
2172 extern int ext4_orphan_del(handle_t *, struct inode *);
2173 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2174 __u32 start_minor_hash, __u32 *next_hash);
2175 extern int search_dir(struct buffer_head *bh,
2179 const struct qstr *d_name,
2180 unsigned int offset,
2181 struct ext4_dir_entry_2 **res_dir);
2182 extern int ext4_generic_delete_entry(handle_t *handle,
2184 struct ext4_dir_entry_2 *de_del,
2185 struct buffer_head *bh,
2191 extern int ext4_group_add(struct super_block *sb,
2192 struct ext4_new_group_data *input);
2193 extern int ext4_group_extend(struct super_block *sb,
2194 struct ext4_super_block *es,
2195 ext4_fsblk_t n_blocks_count);
2196 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2199 extern int ext4_calculate_overhead(struct super_block *sb);
2200 extern int ext4_superblock_csum_verify(struct super_block *sb,
2201 struct ext4_super_block *es);
2202 extern void ext4_superblock_csum_set(struct super_block *sb);
2203 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2204 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2205 extern void ext4_kvfree(void *ptr);
2206 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2207 ext4_group_t ngroup);
2208 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2211 extern __printf(4, 5)
2212 void __ext4_error(struct super_block *, const char *, unsigned int,
2214 extern __printf(5, 6)
2215 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2217 extern __printf(5, 6)
2218 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2220 extern void __ext4_std_error(struct super_block *, const char *,
2222 extern __printf(4, 5)
2223 void __ext4_abort(struct super_block *, const char *, unsigned int,
2225 extern __printf(4, 5)
2226 void __ext4_warning(struct super_block *, const char *, unsigned int,
2228 extern __printf(3, 4)
2229 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2230 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2231 const char *, unsigned int, const char *);
2232 extern __printf(7, 8)
2233 void __ext4_grp_locked_error(const char *, unsigned int,
2234 struct super_block *, ext4_group_t,
2235 unsigned long, ext4_fsblk_t,
2238 #ifdef CONFIG_PRINTK
2240 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2241 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2242 #define ext4_error_file(file, func, line, block, fmt, ...) \
2243 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2244 #define ext4_error(sb, fmt, ...) \
2245 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2246 #define ext4_abort(sb, fmt, ...) \
2247 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2248 #define ext4_warning(sb, fmt, ...) \
2249 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2250 #define ext4_msg(sb, level, fmt, ...) \
2251 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2252 #define dump_mmp_msg(sb, mmp, msg) \
2253 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2254 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2255 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2260 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2262 no_printk(fmt, ##__VA_ARGS__); \
2263 __ext4_error_inode(inode, "", 0, block, " "); \
2265 #define ext4_error_file(file, func, line, block, fmt, ...) \
2267 no_printk(fmt, ##__VA_ARGS__); \
2268 __ext4_error_file(file, "", 0, block, " "); \
2270 #define ext4_error(sb, fmt, ...) \
2272 no_printk(fmt, ##__VA_ARGS__); \
2273 __ext4_error(sb, "", 0, " "); \
2275 #define ext4_abort(sb, fmt, ...) \
2277 no_printk(fmt, ##__VA_ARGS__); \
2278 __ext4_abort(sb, "", 0, " "); \
2280 #define ext4_warning(sb, fmt, ...) \
2282 no_printk(fmt, ##__VA_ARGS__); \
2283 __ext4_warning(sb, "", 0, " "); \
2285 #define ext4_msg(sb, level, fmt, ...) \
2287 no_printk(fmt, ##__VA_ARGS__); \
2288 __ext4_msg(sb, "", " "); \
2290 #define dump_mmp_msg(sb, mmp, msg) \
2291 __dump_mmp_msg(sb, mmp, "", 0, "")
2292 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2294 no_printk(fmt, ##__VA_ARGS__); \
2295 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2300 extern void ext4_update_dynamic_rev(struct super_block *sb);
2301 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2303 extern int ext4_update_rocompat_feature(handle_t *handle,
2304 struct super_block *sb, __u32 rocompat);
2305 extern int ext4_update_incompat_feature(handle_t *handle,
2306 struct super_block *sb, __u32 incompat);
2307 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2308 struct ext4_group_desc *bg);
2309 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2310 struct ext4_group_desc *bg);
2311 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2312 struct ext4_group_desc *bg);
2313 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2314 struct ext4_group_desc *bg);
2315 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2316 struct ext4_group_desc *bg);
2317 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2318 struct ext4_group_desc *bg);
2319 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2320 struct ext4_group_desc *bg);
2321 extern void ext4_block_bitmap_set(struct super_block *sb,
2322 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2323 extern void ext4_inode_bitmap_set(struct super_block *sb,
2324 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2325 extern void ext4_inode_table_set(struct super_block *sb,
2326 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2327 extern void ext4_free_group_clusters_set(struct super_block *sb,
2328 struct ext4_group_desc *bg,
2330 extern void ext4_free_inodes_set(struct super_block *sb,
2331 struct ext4_group_desc *bg, __u32 count);
2332 extern void ext4_used_dirs_set(struct super_block *sb,
2333 struct ext4_group_desc *bg, __u32 count);
2334 extern void ext4_itable_unused_set(struct super_block *sb,
2335 struct ext4_group_desc *bg, __u32 count);
2336 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2337 struct ext4_group_desc *gdp);
2338 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2339 struct ext4_group_desc *gdp);
2340 extern int ext4_register_li_request(struct super_block *sb,
2341 ext4_group_t first_not_zeroed);
2343 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2345 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2346 EXT4_FEATURE_RO_COMPAT_GDT_CSUM |
2347 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM);
2350 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2352 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2353 le32_to_cpu(es->s_blocks_count_lo);
2356 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2358 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2359 le32_to_cpu(es->s_r_blocks_count_lo);
2362 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2364 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2365 le32_to_cpu(es->s_free_blocks_count_lo);
2368 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2371 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2372 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2375 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2378 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2379 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2382 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2385 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2386 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2389 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2391 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2392 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2393 le32_to_cpu(raw_inode->i_size_lo);
2395 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2398 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2400 raw_inode->i_size_lo = cpu_to_le32(i_size);
2401 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2405 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2408 struct ext4_group_info ***grp_info;
2409 long indexv, indexh;
2410 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2411 grp_info = EXT4_SB(sb)->s_group_info;
2412 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2413 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2414 return grp_info[indexv][indexh];
2418 * Reading s_groups_count requires using smp_rmb() afterwards. See
2419 * the locking protocol documented in the comments of ext4_group_add()
2422 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2424 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2430 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2431 ext4_group_t block_group)
2433 return block_group >> sbi->s_log_groups_per_flex;
2436 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2438 return 1 << sbi->s_log_groups_per_flex;
2441 #define ext4_std_error(sb, errno) \
2444 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2448 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2449 * counters. So we need to make sure we have free clusters more
2450 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2452 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2454 #define EXT4_FREECLUSTERS_WATERMARK 0
2457 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2458 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2460 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2461 !mutex_is_locked(&inode->i_mutex));
2462 down_write(&EXT4_I(inode)->i_data_sem);
2463 if (newsize > EXT4_I(inode)->i_disksize)
2464 EXT4_I(inode)->i_disksize = newsize;
2465 up_write(&EXT4_I(inode)->i_data_sem);
2468 struct ext4_group_info {
2469 unsigned long bb_state;
2470 struct rb_root bb_free_root;
2471 ext4_grpblk_t bb_first_free; /* first free block */
2472 ext4_grpblk_t bb_free; /* total free blocks */
2473 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2474 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2475 struct list_head bb_prealloc_list;
2479 struct rw_semaphore alloc_sem;
2480 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2481 * regions, index is order.
2482 * bb_counters[3] = 5 means
2483 * 5 free 8-block regions. */
2486 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2487 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2488 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2489 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2491 #define EXT4_MB_GRP_NEED_INIT(grp) \
2492 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2493 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2494 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2495 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2496 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2498 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2499 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2500 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2501 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2502 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2503 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2505 #define EXT4_MAX_CONTENTION 8
2506 #define EXT4_CONTENTION_THRESHOLD 2
2508 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2511 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2515 * Returns true if the filesystem is busy enough that attempts to
2516 * access the block group locks has run into contention.
2518 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2520 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2523 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2525 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2526 if (spin_trylock(lock))
2528 * We're able to grab the lock right away, so drop the
2529 * lock contention counter.
2531 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2534 * The lock is busy, so bump the contention counter,
2535 * and then wait on the spin lock.
2537 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2538 EXT4_MAX_CONTENTION);
2543 static inline void ext4_unlock_group(struct super_block *sb,
2546 spin_unlock(ext4_group_lock_ptr(sb, group));
2550 * Block validity checking
2552 #define ext4_check_indirect_blockref(inode, bh) \
2553 ext4_check_blockref(__func__, __LINE__, inode, \
2554 (__le32 *)(bh)->b_data, \
2555 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2557 #define ext4_ind_check_inode(inode) \
2558 ext4_check_blockref(__func__, __LINE__, inode, \
2559 EXT4_I(inode)->i_data, \
2563 * Inodes and files operations
2567 extern const struct file_operations ext4_dir_operations;
2570 extern const struct inode_operations ext4_file_inode_operations;
2571 extern const struct file_operations ext4_file_operations;
2572 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2573 extern void ext4_unwritten_wait(struct inode *inode);
2576 extern int ext4_has_inline_data(struct inode *inode);
2577 extern int ext4_get_inline_size(struct inode *inode);
2578 extern int ext4_get_max_inline_size(struct inode *inode);
2579 extern int ext4_find_inline_data_nolock(struct inode *inode);
2580 extern void ext4_write_inline_data(struct inode *inode,
2581 struct ext4_iloc *iloc,
2582 void *buffer, loff_t pos,
2584 extern int ext4_prepare_inline_data(handle_t *handle, struct inode *inode,
2586 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2588 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2590 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2591 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2592 struct inode *inode,
2593 loff_t pos, unsigned len,
2595 struct page **pagep);
2596 extern int ext4_write_inline_data_end(struct inode *inode,
2597 loff_t pos, unsigned len,
2600 extern struct buffer_head *
2601 ext4_journalled_write_inline_data(struct inode *inode,
2604 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2605 struct inode *inode,
2606 loff_t pos, unsigned len,
2608 struct page **pagep,
2610 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2611 unsigned len, unsigned copied,
2613 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2614 struct inode *inode);
2615 extern int ext4_try_create_inline_dir(handle_t *handle,
2616 struct inode *parent,
2617 struct inode *inode);
2618 extern int ext4_read_inline_dir(struct file *filp,
2619 struct dir_context *ctx,
2620 int *has_inline_data);
2621 extern int htree_inlinedir_to_tree(struct file *dir_file,
2622 struct inode *dir, ext4_lblk_t block,
2623 struct dx_hash_info *hinfo,
2624 __u32 start_hash, __u32 start_minor_hash,
2625 int *has_inline_data);
2626 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2627 const struct qstr *d_name,
2628 struct ext4_dir_entry_2 **res_dir,
2629 int *has_inline_data);
2630 extern int ext4_delete_inline_entry(handle_t *handle,
2632 struct ext4_dir_entry_2 *de_del,
2633 struct buffer_head *bh,
2634 int *has_inline_data);
2635 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2636 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2637 struct ext4_dir_entry_2 **parent_de,
2639 extern int ext4_inline_data_fiemap(struct inode *inode,
2640 struct fiemap_extent_info *fieinfo,
2642 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2643 struct inode *inode,
2645 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2647 extern int ext4_convert_inline_data(struct inode *inode);
2650 extern const struct inode_operations ext4_dir_inode_operations;
2651 extern const struct inode_operations ext4_special_inode_operations;
2652 extern struct dentry *ext4_get_parent(struct dentry *child);
2653 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2654 struct ext4_dir_entry_2 *de,
2655 int blocksize, int csum_size,
2656 unsigned int parent_ino, int dotdot_real_len);
2657 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2658 unsigned int blocksize);
2659 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2660 struct inode *inode,
2661 struct buffer_head *bh);
2663 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2664 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2665 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2666 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2667 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2668 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2669 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2670 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2673 static inline void ext4_set_de_type(struct super_block *sb,
2674 struct ext4_dir_entry_2 *de,
2676 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2677 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2682 extern const struct inode_operations ext4_symlink_inode_operations;
2683 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2685 /* block_validity */
2686 extern void ext4_release_system_zone(struct super_block *sb);
2687 extern int ext4_setup_system_zone(struct super_block *sb);
2688 extern int __init ext4_init_system_zone(void);
2689 extern void ext4_exit_system_zone(void);
2690 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2691 ext4_fsblk_t start_blk,
2692 unsigned int count);
2693 extern int ext4_check_blockref(const char *, unsigned int,
2694 struct inode *, __le32 *, unsigned int);
2697 struct ext4_ext_path;
2701 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2704 #define EXT_MAX_BLOCKS 0xffffffff
2706 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2707 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2708 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2709 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2710 struct ext4_map_blocks *map, int flags);
2711 extern void ext4_ext_truncate(handle_t *, struct inode *);
2712 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2714 extern void ext4_ext_init(struct super_block *);
2715 extern void ext4_ext_release(struct super_block *);
2716 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2718 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2719 loff_t offset, ssize_t len);
2720 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2721 struct ext4_map_blocks *map, int flags);
2722 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2723 ext4_lblk_t lblocks);
2724 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2725 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2727 struct ext4_ext_path *path);
2728 extern int ext4_can_extents_be_merged(struct inode *inode,
2729 struct ext4_extent *ex1,
2730 struct ext4_extent *ex2);
2731 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2732 struct ext4_ext_path *,
2733 struct ext4_extent *, int);
2734 extern struct ext4_ext_path *ext4_ext_find_extent(struct inode *, ext4_lblk_t,
2735 struct ext4_ext_path *,
2737 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2738 extern int ext4_ext_check_inode(struct inode *inode);
2739 extern int ext4_find_delalloc_range(struct inode *inode,
2740 ext4_lblk_t lblk_start,
2741 ext4_lblk_t lblk_end);
2742 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2743 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
2744 __u64 start, __u64 len);
2745 extern int ext4_ext_precache(struct inode *inode);
2746 extern int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len);
2749 extern void ext4_double_down_write_data_sem(struct inode *first,
2750 struct inode *second);
2751 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2752 struct inode *donor_inode);
2753 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2754 __u64 start_orig, __u64 start_donor,
2755 __u64 len, __u64 *moved_len);
2756 extern int mext_next_extent(struct inode *inode, struct ext4_ext_path *path,
2757 struct ext4_extent **extent);
2760 extern int __init ext4_init_pageio(void);
2761 extern void ext4_exit_pageio(void);
2762 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2763 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2764 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2765 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2766 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2767 struct writeback_control *wbc);
2768 extern void ext4_end_io_rsv_work(struct work_struct *work);
2769 extern void ext4_io_submit(struct ext4_io_submit *io);
2770 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2773 struct writeback_control *wbc);
2776 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2777 extern void ext4_mmp_csum_set(struct super_block *sb, struct mmp_struct *mmp);
2778 extern int ext4_mmp_csum_verify(struct super_block *sb,
2779 struct mmp_struct *mmp);
2782 * Note that these flags will never ever appear in a buffer_head's state flag.
2783 * See EXT4_MAP_... to see where this is used.
2785 enum ext4_state_bits {
2786 BH_AllocFromCluster /* allocated blocks were part of already
2787 * allocated cluster. */
2788 = BH_JBDPrivateStart
2792 * Add new method to test whether block and inode bitmaps are properly
2793 * initialized. With uninit_bg reading the block from disk is not enough
2794 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2796 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2798 static inline int bitmap_uptodate(struct buffer_head *bh)
2800 return (buffer_uptodate(bh) &&
2801 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2803 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2805 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2809 * Disable DIO read nolock optimization, so new dioreaders will be forced
2812 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2814 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2817 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2820 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2823 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2825 /* For ioend & aio unwritten conversion wait queues */
2826 #define EXT4_WQ_HASH_SZ 37
2827 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2829 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2831 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2832 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2834 #define EXT4_RESIZING 0
2835 extern int ext4_resize_begin(struct super_block *sb);
2836 extern void ext4_resize_end(struct super_block *sb);
2838 #endif /* __KERNEL__ */
2840 #endif /* _EXT4_H */