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 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
162 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY)
164 struct ext4_map_blocks {
168 unsigned int m_flags;
172 * Flags for ext4_io_end->flags
174 #define EXT4_IO_END_UNWRITTEN 0x0001
177 * For converting unwritten extents on a work queue. 'handle' is used for
178 * buffered writeback.
180 typedef struct ext4_io_end {
181 struct list_head list; /* per-file finished IO list */
182 handle_t *handle; /* handle reserved for extent
184 struct inode *inode; /* file being written to */
185 struct bio *bio; /* Linked list of completed
186 * bios covering the extent */
187 unsigned int flag; /* unwritten or not */
188 loff_t offset; /* offset in the file */
189 ssize_t size; /* size of the extent */
190 atomic_t count; /* reference counter */
193 struct ext4_io_submit {
196 ext4_io_end_t *io_end;
197 sector_t io_next_block;
201 * Special inodes numbers
203 #define EXT4_BAD_INO 1 /* Bad blocks inode */
204 #define EXT4_ROOT_INO 2 /* Root inode */
205 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
206 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
207 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
208 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
209 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
210 #define EXT4_JOURNAL_INO 8 /* Journal inode */
212 /* First non-reserved inode for old ext4 filesystems */
213 #define EXT4_GOOD_OLD_FIRST_INO 11
216 * Maximal count of links to a file
218 #define EXT4_LINK_MAX 65000
221 * Macro-instructions used to manage several block sizes
223 #define EXT4_MIN_BLOCK_SIZE 1024
224 #define EXT4_MAX_BLOCK_SIZE 65536
225 #define EXT4_MIN_BLOCK_LOG_SIZE 10
226 #define EXT4_MAX_BLOCK_LOG_SIZE 16
228 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
230 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
232 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
233 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
234 EXT4_SB(s)->s_cluster_bits)
236 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
237 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
239 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
242 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
243 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
244 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
246 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
247 EXT4_GOOD_OLD_INODE_SIZE : \
249 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
250 EXT4_GOOD_OLD_FIRST_INO : \
253 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
255 /* Translate a block number to a cluster number */
256 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
257 /* Translate a cluster number to a block number */
258 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
259 /* Translate # of blks to # of clusters */
260 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
261 (sbi)->s_cluster_bits)
262 /* Mask out the low bits to get the starting block of the cluster */
263 #define EXT4_PBLK_CMASK(s, pblk) ((pblk) & \
264 ~((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
265 #define EXT4_LBLK_CMASK(s, lblk) ((lblk) & \
266 ~((ext4_lblk_t) (s)->s_cluster_ratio - 1))
267 /* Get the cluster offset */
268 #define EXT4_PBLK_COFF(s, pblk) ((pblk) & \
269 ((ext4_fsblk_t) (s)->s_cluster_ratio - 1))
270 #define EXT4_LBLK_COFF(s, lblk) ((lblk) & \
271 ((ext4_lblk_t) (s)->s_cluster_ratio - 1))
274 * Structure of a blocks group descriptor
276 struct ext4_group_desc
278 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
279 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
280 __le32 bg_inode_table_lo; /* Inodes table block */
281 __le16 bg_free_blocks_count_lo;/* Free blocks count */
282 __le16 bg_free_inodes_count_lo;/* Free inodes count */
283 __le16 bg_used_dirs_count_lo; /* Directories count */
284 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
285 __le32 bg_exclude_bitmap_lo; /* Exclude bitmap for snapshots */
286 __le16 bg_block_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+bbitmap) LE */
287 __le16 bg_inode_bitmap_csum_lo;/* crc32c(s_uuid+grp_num+ibitmap) LE */
288 __le16 bg_itable_unused_lo; /* Unused inodes count */
289 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
290 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
291 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
292 __le32 bg_inode_table_hi; /* Inodes table block MSB */
293 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
294 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
295 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
296 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
297 __le32 bg_exclude_bitmap_hi; /* Exclude bitmap block MSB */
298 __le16 bg_block_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+bbitmap) BE */
299 __le16 bg_inode_bitmap_csum_hi;/* crc32c(s_uuid+grp_num+ibitmap) BE */
303 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
304 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
306 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
307 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
311 * Structure of a flex block group info
315 atomic64_t free_clusters;
316 atomic_t free_inodes;
320 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
321 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
322 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
325 * Macro-instructions used to manage group descriptors
327 #define EXT4_MIN_DESC_SIZE 32
328 #define EXT4_MIN_DESC_SIZE_64BIT 64
329 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
330 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
332 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
333 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
334 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
335 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
336 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
338 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
339 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
340 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
344 * Constants relative to the data blocks
346 #define EXT4_NDIR_BLOCKS 12
347 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
348 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
349 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
350 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
355 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
356 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
357 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
358 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
359 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
360 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
361 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
362 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
363 /* Reserved for compression usage... */
364 #define EXT4_DIRTY_FL 0x00000100
365 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
366 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
367 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
368 /* End compression flags --- maybe not all used */
369 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
370 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
371 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
372 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
373 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
374 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
375 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
376 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
377 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
378 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
379 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
380 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
382 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
383 #define EXT4_FL_USER_MODIFIABLE 0x004380FF /* User modifiable flags */
385 /* Flags that should be inherited by new inodes from their parent. */
386 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
387 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
388 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
389 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
391 /* Flags that are appropriate for regular files (all but dir-specific ones). */
392 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
394 /* Flags that are appropriate for non-directories/regular files. */
395 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
397 /* Mask out flags that are inappropriate for the given type of inode. */
398 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
402 else if (S_ISREG(mode))
403 return flags & EXT4_REG_FLMASK;
405 return flags & EXT4_OTHER_FLMASK;
409 * Inode flags used for atomic set/get
412 EXT4_INODE_SECRM = 0, /* Secure deletion */
413 EXT4_INODE_UNRM = 1, /* Undelete */
414 EXT4_INODE_COMPR = 2, /* Compress file */
415 EXT4_INODE_SYNC = 3, /* Synchronous updates */
416 EXT4_INODE_IMMUTABLE = 4, /* Immutable file */
417 EXT4_INODE_APPEND = 5, /* writes to file may only append */
418 EXT4_INODE_NODUMP = 6, /* do not dump file */
419 EXT4_INODE_NOATIME = 7, /* do not update atime */
420 /* Reserved for compression usage... */
421 EXT4_INODE_DIRTY = 8,
422 EXT4_INODE_COMPRBLK = 9, /* One or more compressed clusters */
423 EXT4_INODE_NOCOMPR = 10, /* Don't compress */
424 EXT4_INODE_ECOMPR = 11, /* Compression error */
425 /* End compression flags --- maybe not all used */
426 EXT4_INODE_INDEX = 12, /* hash-indexed directory */
427 EXT4_INODE_IMAGIC = 13, /* AFS directory */
428 EXT4_INODE_JOURNAL_DATA = 14, /* file data should be journaled */
429 EXT4_INODE_NOTAIL = 15, /* file tail should not be merged */
430 EXT4_INODE_DIRSYNC = 16, /* dirsync behaviour (directories only) */
431 EXT4_INODE_TOPDIR = 17, /* Top of directory hierarchies*/
432 EXT4_INODE_HUGE_FILE = 18, /* Set to each huge file */
433 EXT4_INODE_EXTENTS = 19, /* Inode uses extents */
434 EXT4_INODE_EA_INODE = 21, /* Inode used for large EA */
435 EXT4_INODE_EOFBLOCKS = 22, /* Blocks allocated beyond EOF */
436 EXT4_INODE_INLINE_DATA = 28, /* Data in inode. */
437 EXT4_INODE_RESERVED = 31, /* reserved for ext4 lib */
441 * Since it's pretty easy to mix up bit numbers and hex values, we use a
442 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
443 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
444 * any extra space in the compiled kernel image, otherwise, the build will fail.
445 * It's important that these values are the same, since we are using
446 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
447 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
448 * values found in ext2, ext3 and ext4 filesystems, and of course the values
449 * defined in e2fsprogs.
451 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
453 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
454 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
456 static inline void ext4_check_flag_values(void)
458 CHECK_FLAG_VALUE(SECRM);
459 CHECK_FLAG_VALUE(UNRM);
460 CHECK_FLAG_VALUE(COMPR);
461 CHECK_FLAG_VALUE(SYNC);
462 CHECK_FLAG_VALUE(IMMUTABLE);
463 CHECK_FLAG_VALUE(APPEND);
464 CHECK_FLAG_VALUE(NODUMP);
465 CHECK_FLAG_VALUE(NOATIME);
466 CHECK_FLAG_VALUE(DIRTY);
467 CHECK_FLAG_VALUE(COMPRBLK);
468 CHECK_FLAG_VALUE(NOCOMPR);
469 CHECK_FLAG_VALUE(ECOMPR);
470 CHECK_FLAG_VALUE(INDEX);
471 CHECK_FLAG_VALUE(IMAGIC);
472 CHECK_FLAG_VALUE(JOURNAL_DATA);
473 CHECK_FLAG_VALUE(NOTAIL);
474 CHECK_FLAG_VALUE(DIRSYNC);
475 CHECK_FLAG_VALUE(TOPDIR);
476 CHECK_FLAG_VALUE(HUGE_FILE);
477 CHECK_FLAG_VALUE(EXTENTS);
478 CHECK_FLAG_VALUE(EA_INODE);
479 CHECK_FLAG_VALUE(EOFBLOCKS);
480 CHECK_FLAG_VALUE(INLINE_DATA);
481 CHECK_FLAG_VALUE(RESERVED);
484 /* Used to pass group descriptor data when online resize is done */
485 struct ext4_new_group_input {
486 __u32 group; /* Group number for this data */
487 __u64 block_bitmap; /* Absolute block number of block bitmap */
488 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
489 __u64 inode_table; /* Absolute block number of inode table start */
490 __u32 blocks_count; /* Total number of blocks in this group */
491 __u16 reserved_blocks; /* Number of reserved blocks in this group */
495 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
496 struct compat_ext4_new_group_input {
498 compat_u64 block_bitmap;
499 compat_u64 inode_bitmap;
500 compat_u64 inode_table;
507 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
508 struct ext4_new_group_data {
514 __u16 reserved_blocks;
516 __u32 free_blocks_count;
519 /* Indexes used to index group tables in ext4_new_group_data */
521 BLOCK_BITMAP = 0, /* block bitmap */
522 INODE_BITMAP, /* inode bitmap */
523 INODE_TABLE, /* inode tables */
528 * Flags used by ext4_map_blocks()
530 /* Allocate any needed blocks and/or convert an unwritten
531 extent to be an initialized ext4 */
532 #define EXT4_GET_BLOCKS_CREATE 0x0001
533 /* Request the creation of an unwritten extent */
534 #define EXT4_GET_BLOCKS_UNWRIT_EXT 0x0002
535 #define EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT (EXT4_GET_BLOCKS_UNWRIT_EXT|\
536 EXT4_GET_BLOCKS_CREATE)
537 /* Caller is from the delayed allocation writeout path
538 * finally doing the actual allocation of delayed blocks */
539 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
540 /* caller is from the direct IO path, request to creation of an
541 unwritten extents if not allocated, split the unwritten
542 extent if blocks has been preallocated already*/
543 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
544 #define EXT4_GET_BLOCKS_CONVERT 0x0010
545 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
546 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
547 /* Convert extent to initialized after IO complete */
548 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
549 EXT4_GET_BLOCKS_CREATE_UNWRIT_EXT)
550 /* Eventual metadata allocation (due to growing extent tree)
551 * should not fail, so try to use reserved blocks for that.*/
552 #define EXT4_GET_BLOCKS_METADATA_NOFAIL 0x0020
553 /* Don't normalize allocation size (used for fallocate) */
554 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
555 /* Request will not result in inode size update (user for fallocate) */
556 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
557 /* Do not take i_data_sem locking in ext4_map_blocks */
558 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
559 /* Convert written extents to unwritten */
560 #define EXT4_GET_BLOCKS_CONVERT_UNWRITTEN 0x0200
563 * The bit position of these flags must not overlap with any of the
564 * EXT4_GET_BLOCKS_*. They are used by ext4_find_extent(),
565 * read_extent_tree_block(), ext4_split_extent_at(),
566 * ext4_ext_insert_extent(), and ext4_ext_create_new_leaf().
567 * EXT4_EX_NOCACHE is used to indicate that the we shouldn't be
568 * caching the extents when reading from the extent tree while a
569 * truncate or punch hole operation is in progress.
571 #define EXT4_EX_NOCACHE 0x40000000
572 #define EXT4_EX_FORCE_CACHE 0x20000000
575 * Flags used by ext4_free_blocks
577 #define EXT4_FREE_BLOCKS_METADATA 0x0001
578 #define EXT4_FREE_BLOCKS_FORGET 0x0002
579 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
580 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
581 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
582 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
587 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
588 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
589 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
590 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
591 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
592 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
593 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
594 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
595 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
596 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
597 #define EXT4_IOC_MIGRATE _IO('f', 9)
598 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
599 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
600 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
601 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
602 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
603 #define EXT4_IOC_SWAP_BOOT _IO('f', 17)
604 #define EXT4_IOC_PRECACHE_EXTENTS _IO('f', 18)
606 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
608 * ioctl commands in 32 bit emulation
610 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
611 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
612 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
613 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
614 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
615 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
616 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
617 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
618 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
619 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
622 /* Max physical block we can address w/o extents */
623 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
626 * Structure of an inode on the disk
629 __le16 i_mode; /* File mode */
630 __le16 i_uid; /* Low 16 bits of Owner Uid */
631 __le32 i_size_lo; /* Size in bytes */
632 __le32 i_atime; /* Access time */
633 __le32 i_ctime; /* Inode Change time */
634 __le32 i_mtime; /* Modification time */
635 __le32 i_dtime; /* Deletion Time */
636 __le16 i_gid; /* Low 16 bits of Group Id */
637 __le16 i_links_count; /* Links count */
638 __le32 i_blocks_lo; /* Blocks count */
639 __le32 i_flags; /* File flags */
645 __u32 h_i_translator;
650 } osd1; /* OS dependent 1 */
651 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
652 __le32 i_generation; /* File version (for NFS) */
653 __le32 i_file_acl_lo; /* File ACL */
655 __le32 i_obso_faddr; /* Obsoleted fragment address */
658 __le16 l_i_blocks_high; /* were l_i_reserved1 */
659 __le16 l_i_file_acl_high;
660 __le16 l_i_uid_high; /* these 2 fields */
661 __le16 l_i_gid_high; /* were reserved2[0] */
662 __le16 l_i_checksum_lo;/* crc32c(uuid+inum+inode) LE */
666 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
673 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
674 __le16 m_i_file_acl_high;
675 __u32 m_i_reserved2[2];
677 } osd2; /* OS dependent 2 */
678 __le16 i_extra_isize;
679 __le16 i_checksum_hi; /* crc32c(uuid+inum+inode) BE */
680 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
681 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
682 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
683 __le32 i_crtime; /* File Creation time */
684 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
685 __le32 i_version_hi; /* high 32 bits for 64-bit version */
689 __u32 reserved; /* should be zero */
690 __u32 donor_fd; /* donor file descriptor */
691 __u64 orig_start; /* logical start offset in block for orig */
692 __u64 donor_start; /* logical start offset in block for donor */
693 __u64 len; /* block length to be moved */
694 __u64 moved_len; /* moved block length */
697 #define EXT4_EPOCH_BITS 2
698 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
699 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
702 * Extended fields will fit into an inode if the filesystem was formatted
703 * with large inodes (-I 256 or larger) and there are not currently any EAs
704 * consuming all of the available space. For new inodes we always reserve
705 * enough space for the kernel's known extended fields, but for inodes
706 * created with an old kernel this might not have been the case. None of
707 * the extended inode fields is critical for correct filesystem operation.
708 * This macro checks if a certain field fits in the inode. Note that
709 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
711 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
712 ((offsetof(typeof(*ext4_inode), field) + \
713 sizeof((ext4_inode)->field)) \
714 <= (EXT4_GOOD_OLD_INODE_SIZE + \
715 (einode)->i_extra_isize)) \
717 static inline __le32 ext4_encode_extra_time(struct timespec *time)
719 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
720 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
721 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
724 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
726 if (sizeof(time->tv_sec) > 4)
727 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
729 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
732 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
734 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
735 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
736 (raw_inode)->xtime ## _extra = \
737 ext4_encode_extra_time(&(inode)->xtime); \
740 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
742 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
743 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
744 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
745 (raw_inode)->xtime ## _extra = \
746 ext4_encode_extra_time(&(einode)->xtime); \
749 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
751 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
752 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
753 ext4_decode_extra_time(&(inode)->xtime, \
754 raw_inode->xtime ## _extra); \
756 (inode)->xtime.tv_nsec = 0; \
759 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
761 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
762 (einode)->xtime.tv_sec = \
763 (signed)le32_to_cpu((raw_inode)->xtime); \
765 (einode)->xtime.tv_sec = 0; \
766 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
767 ext4_decode_extra_time(&(einode)->xtime, \
768 raw_inode->xtime ## _extra); \
770 (einode)->xtime.tv_nsec = 0; \
773 #define i_disk_version osd1.linux1.l_i_version
775 #if defined(__KERNEL__) || defined(__linux__)
776 #define i_reserved1 osd1.linux1.l_i_reserved1
777 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
778 #define i_blocks_high osd2.linux2.l_i_blocks_high
779 #define i_uid_low i_uid
780 #define i_gid_low i_gid
781 #define i_uid_high osd2.linux2.l_i_uid_high
782 #define i_gid_high osd2.linux2.l_i_gid_high
783 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
785 #elif defined(__GNU__)
787 #define i_translator osd1.hurd1.h_i_translator
788 #define i_uid_high osd2.hurd2.h_i_uid_high
789 #define i_gid_high osd2.hurd2.h_i_gid_high
790 #define i_author osd2.hurd2.h_i_author
792 #elif defined(__masix__)
794 #define i_reserved1 osd1.masix1.m_i_reserved1
795 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
796 #define i_reserved2 osd2.masix2.m_i_reserved2
798 #endif /* defined(__KERNEL__) || defined(__linux__) */
800 #include "extents_status.h"
803 * fourth extended file system inode data in memory
805 struct ext4_inode_info {
806 __le32 i_data[15]; /* unconverted */
808 ext4_fsblk_t i_file_acl;
811 * i_block_group is the number of the block group which contains
812 * this file's inode. Constant across the lifetime of the inode,
813 * it is ued for making block allocation decisions - we try to
814 * place a file's data blocks near its inode block, and new inodes
815 * near to their parent directory's inode.
817 ext4_group_t i_block_group;
818 ext4_lblk_t i_dir_start_lookup;
819 #if (BITS_PER_LONG < 64)
820 unsigned long i_state_flags; /* Dynamic state flags */
822 unsigned long i_flags;
825 * Extended attributes can be read independently of the main file
826 * data. Taking i_mutex even when reading would cause contention
827 * between readers of EAs and writers of regular file data, so
828 * instead we synchronize on xattr_sem when reading or changing
831 struct rw_semaphore xattr_sem;
833 struct list_head i_orphan; /* unlinked but open inodes */
836 * i_disksize keeps track of what the inode size is ON DISK, not
837 * in memory. During truncate, i_size is set to the new size by
838 * the VFS prior to calling ext4_truncate(), but the filesystem won't
839 * set i_disksize to 0 until the truncate is actually under way.
841 * The intent is that i_disksize always represents the blocks which
842 * are used by this file. This allows recovery to restart truncate
843 * on orphans if we crash during truncate. We actually write i_disksize
844 * into the on-disk inode when writing inodes out, instead of i_size.
846 * The only time when i_disksize and i_size may be different is when
847 * a truncate is in progress. The only things which change i_disksize
848 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
853 * i_data_sem is for serialising ext4_truncate() against
854 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
855 * data tree are chopped off during truncate. We can't do that in
856 * ext4 because whenever we perform intermediate commits during
857 * truncate, the inode and all the metadata blocks *must* be in a
858 * consistent state which allows truncation of the orphans to restart
859 * during recovery. Hence we must fix the get_block-vs-truncate race
860 * by other means, so we have i_data_sem.
862 struct rw_semaphore i_data_sem;
863 struct inode vfs_inode;
864 struct jbd2_inode *jinode;
866 spinlock_t i_raw_lock; /* protects updates to the raw inode */
869 * File creation time. Its function is same as that of
870 * struct timespec i_{a,c,m}time in the generic inode.
872 struct timespec i_crtime;
875 struct list_head i_prealloc_list;
876 spinlock_t i_prealloc_lock;
878 /* extents status tree */
879 struct ext4_es_tree i_es_tree;
881 struct list_head i_es_list;
882 unsigned int i_es_all_nr; /* protected by i_es_lock */
883 unsigned int i_es_shk_nr; /* protected by i_es_lock */
886 ext4_group_t i_last_alloc_group;
888 /* allocation reservation info for delalloc */
889 /* In case of bigalloc, these refer to clusters rather than blocks */
890 unsigned int i_reserved_data_blocks;
891 unsigned int i_reserved_meta_blocks;
892 unsigned int i_allocated_meta_blocks;
893 ext4_lblk_t i_da_metadata_calc_last_lblock;
894 int i_da_metadata_calc_len;
896 /* on-disk additional length */
899 /* Indicate the inline data space. */
904 /* quota space reservation, managed internally by quota code */
905 qsize_t i_reserved_quota;
908 /* Lock protecting lists below */
909 spinlock_t i_completed_io_lock;
911 * Completed IOs that need unwritten extents handling and have
912 * transaction reserved
914 struct list_head i_rsv_conversion_list;
916 * Completed IOs that need unwritten extents handling and don't have
917 * transaction reserved
919 atomic_t i_ioend_count; /* Number of outstanding io_end structs */
920 atomic_t i_unwritten; /* Nr. of inflight conversions pending */
921 struct work_struct i_rsv_conversion_work;
923 spinlock_t i_block_reservation_lock;
926 * Transactions that contain inode's metadata needed to complete
927 * fsync and fdatasync, respectively.
930 tid_t i_datasync_tid;
932 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
939 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
940 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
941 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
944 * Misc. filesystem flags
946 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
947 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
948 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
951 * Mount flags set via mount options or defaults
953 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
954 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
955 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
956 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
957 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
958 #define EXT4_MOUNT_ERRORS_MASK 0x00070
959 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
960 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
961 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
962 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
963 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
964 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
965 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
966 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
967 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
968 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
969 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
970 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
971 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
972 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
973 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
974 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
975 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
976 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
977 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
978 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
979 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
980 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
981 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
984 * Mount flags set either automatically (could not be set by mount option)
985 * based on per file system feature or property or in special cases such as
986 * distinguishing between explicit mount option definition and default.
988 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
989 specified delalloc */
990 #define EXT4_MOUNT2_STD_GROUP_SIZE 0x00000002 /* We have standard group
991 size of blocksize * 8
993 #define EXT4_MOUNT2_HURD_COMPAT 0x00000004 /* Support HURD-castrated
996 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
998 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
1000 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1003 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1005 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1007 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1010 #define ext4_test_and_set_bit __test_and_set_bit_le
1011 #define ext4_set_bit __set_bit_le
1012 #define ext4_set_bit_atomic ext2_set_bit_atomic
1013 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1014 #define ext4_clear_bit __clear_bit_le
1015 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1016 #define ext4_test_bit test_bit_le
1017 #define ext4_find_next_zero_bit find_next_zero_bit_le
1018 #define ext4_find_next_bit find_next_bit_le
1020 extern void ext4_set_bits(void *bm, int cur, int len);
1023 * Maximal mount counts between two filesystem checks
1025 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1026 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1029 * Behaviour when detecting errors
1031 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1032 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1033 #define EXT4_ERRORS_PANIC 3 /* Panic */
1034 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1036 /* Metadata checksum algorithm codes */
1037 #define EXT4_CRC32C_CHKSUM 1
1040 * Structure of the super block
1042 struct ext4_super_block {
1043 /*00*/ __le32 s_inodes_count; /* Inodes count */
1044 __le32 s_blocks_count_lo; /* Blocks count */
1045 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
1046 __le32 s_free_blocks_count_lo; /* Free blocks count */
1047 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
1048 __le32 s_first_data_block; /* First Data Block */
1049 __le32 s_log_block_size; /* Block size */
1050 __le32 s_log_cluster_size; /* Allocation cluster size */
1051 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
1052 __le32 s_clusters_per_group; /* # Clusters per group */
1053 __le32 s_inodes_per_group; /* # Inodes per group */
1054 __le32 s_mtime; /* Mount time */
1055 /*30*/ __le32 s_wtime; /* Write time */
1056 __le16 s_mnt_count; /* Mount count */
1057 __le16 s_max_mnt_count; /* Maximal mount count */
1058 __le16 s_magic; /* Magic signature */
1059 __le16 s_state; /* File system state */
1060 __le16 s_errors; /* Behaviour when detecting errors */
1061 __le16 s_minor_rev_level; /* minor revision level */
1062 /*40*/ __le32 s_lastcheck; /* time of last check */
1063 __le32 s_checkinterval; /* max. time between checks */
1064 __le32 s_creator_os; /* OS */
1065 __le32 s_rev_level; /* Revision level */
1066 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
1067 __le16 s_def_resgid; /* Default gid for reserved blocks */
1069 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1071 * Note: the difference between the compatible feature set and
1072 * the incompatible feature set is that if there is a bit set
1073 * in the incompatible feature set that the kernel doesn't
1074 * know about, it should refuse to mount the filesystem.
1076 * e2fsck's requirements are more strict; if it doesn't know
1077 * about a feature in either the compatible or incompatible
1078 * feature set, it must abort and not try to meddle with
1079 * things it doesn't understand...
1081 __le32 s_first_ino; /* First non-reserved inode */
1082 __le16 s_inode_size; /* size of inode structure */
1083 __le16 s_block_group_nr; /* block group # of this superblock */
1084 __le32 s_feature_compat; /* compatible feature set */
1085 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
1086 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
1087 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
1088 /*78*/ char s_volume_name[16]; /* volume name */
1089 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
1090 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
1092 * Performance hints. Directory preallocation should only
1093 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1095 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
1096 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
1097 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
1099 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1101 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
1102 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
1103 __le32 s_journal_dev; /* device number of journal file */
1104 __le32 s_last_orphan; /* start of list of inodes to delete */
1105 __le32 s_hash_seed[4]; /* HTREE hash seed */
1106 __u8 s_def_hash_version; /* Default hash version to use */
1107 __u8 s_jnl_backup_type;
1108 __le16 s_desc_size; /* size of group descriptor */
1109 /*100*/ __le32 s_default_mount_opts;
1110 __le32 s_first_meta_bg; /* First metablock block group */
1111 __le32 s_mkfs_time; /* When the filesystem was created */
1112 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
1113 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1114 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
1115 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
1116 __le32 s_free_blocks_count_hi; /* Free blocks count */
1117 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
1118 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
1119 __le32 s_flags; /* Miscellaneous flags */
1120 __le16 s_raid_stride; /* RAID stride */
1121 __le16 s_mmp_update_interval; /* # seconds to wait in MMP checking */
1122 __le64 s_mmp_block; /* Block for multi-mount protection */
1123 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
1124 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
1125 __u8 s_checksum_type; /* metadata checksum algorithm used */
1126 __le16 s_reserved_pad;
1127 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
1128 __le32 s_snapshot_inum; /* Inode number of active snapshot */
1129 __le32 s_snapshot_id; /* sequential ID of active snapshot */
1130 __le64 s_snapshot_r_blocks_count; /* reserved blocks for active
1131 snapshot's future use */
1132 __le32 s_snapshot_list; /* inode number of the head of the
1133 on-disk snapshot list */
1134 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1135 __le32 s_error_count; /* number of fs errors */
1136 __le32 s_first_error_time; /* first time an error happened */
1137 __le32 s_first_error_ino; /* inode involved in first error */
1138 __le64 s_first_error_block; /* block involved of first error */
1139 __u8 s_first_error_func[32]; /* function where the error happened */
1140 __le32 s_first_error_line; /* line number where error happened */
1141 __le32 s_last_error_time; /* most recent time of an error */
1142 __le32 s_last_error_ino; /* inode involved in last error */
1143 __le32 s_last_error_line; /* line number where error happened */
1144 __le64 s_last_error_block; /* block involved of last error */
1145 __u8 s_last_error_func[32]; /* function where the error happened */
1146 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1147 __u8 s_mount_opts[64];
1148 __le32 s_usr_quota_inum; /* inode for tracking user quota */
1149 __le32 s_grp_quota_inum; /* inode for tracking group quota */
1150 __le32 s_overhead_clusters; /* overhead blocks/clusters in fs */
1151 __le32 s_backup_bgs[2]; /* groups with sparse_super2 SBs */
1152 __le32 s_reserved[106]; /* Padding to the end of the block */
1153 __le32 s_checksum; /* crc32c(superblock) */
1156 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1161 * run-time mount flags
1163 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1164 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1166 /* Number of quota types we support */
1167 #define EXT4_MAXQUOTAS 2
1170 * fourth extended-fs super-block data in memory
1172 struct ext4_sb_info {
1173 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
1174 unsigned long s_inodes_per_block;/* Number of inodes per block */
1175 unsigned long s_blocks_per_group;/* Number of blocks in a group */
1176 unsigned long s_clusters_per_group; /* Number of clusters in a group */
1177 unsigned long s_inodes_per_group;/* Number of inodes in a group */
1178 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
1179 unsigned long s_gdb_count; /* Number of group descriptor blocks */
1180 unsigned long s_desc_per_block; /* Number of group descriptors per block */
1181 ext4_group_t s_groups_count; /* Number of groups in the fs */
1182 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
1183 unsigned long s_overhead; /* # of fs overhead clusters */
1184 unsigned int s_cluster_ratio; /* Number of blocks per cluster */
1185 unsigned int s_cluster_bits; /* log2 of s_cluster_ratio */
1186 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
1187 struct buffer_head * s_sbh; /* Buffer containing the super block */
1188 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
1189 struct buffer_head **s_group_desc;
1190 unsigned int s_mount_opt;
1191 unsigned int s_mount_opt2;
1192 unsigned int s_mount_flags;
1193 unsigned int s_def_mount_opt;
1194 ext4_fsblk_t s_sb_block;
1195 atomic64_t s_resv_clusters;
1198 unsigned short s_mount_state;
1199 unsigned short s_pad;
1200 int s_addr_per_block_bits;
1201 int s_desc_per_block_bits;
1204 unsigned int s_inode_readahead_blks;
1205 unsigned int s_inode_goal;
1206 spinlock_t s_next_gen_lock;
1207 u32 s_next_generation;
1209 int s_def_hash_version;
1210 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
1211 struct percpu_counter s_freeclusters_counter;
1212 struct percpu_counter s_freeinodes_counter;
1213 struct percpu_counter s_dirs_counter;
1214 struct percpu_counter s_dirtyclusters_counter;
1215 struct blockgroup_lock *s_blockgroup_lock;
1216 struct proc_dir_entry *s_proc;
1217 struct kobject s_kobj;
1218 struct completion s_kobj_unregister;
1219 struct super_block *s_sb;
1222 struct journal_s *s_journal;
1223 struct list_head s_orphan;
1224 struct mutex s_orphan_lock;
1225 unsigned long s_resize_flags; /* Flags indicating if there
1227 unsigned long s_commit_interval;
1228 u32 s_max_batch_time;
1229 u32 s_min_batch_time;
1230 struct block_device *journal_bdev;
1232 char *s_qf_names[EXT4_MAXQUOTAS]; /* Names of quota files with journalled quota */
1233 int s_jquota_fmt; /* Format of quota to use */
1235 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
1236 struct rb_root system_blks;
1238 #ifdef EXTENTS_STATS
1239 /* ext4 extents stats */
1240 unsigned long s_ext_min;
1241 unsigned long s_ext_max;
1242 unsigned long s_depth_max;
1243 spinlock_t s_ext_stats_lock;
1244 unsigned long s_ext_blocks;
1245 unsigned long s_ext_extents;
1248 /* for buddy allocator */
1249 struct ext4_group_info ***s_group_info;
1250 struct inode *s_buddy_cache;
1251 spinlock_t s_md_lock;
1252 unsigned short *s_mb_offsets;
1253 unsigned int *s_mb_maxs;
1254 unsigned int s_group_info_size;
1257 unsigned long s_stripe;
1258 unsigned int s_mb_stream_request;
1259 unsigned int s_mb_max_to_scan;
1260 unsigned int s_mb_min_to_scan;
1261 unsigned int s_mb_stats;
1262 unsigned int s_mb_order2_reqs;
1263 unsigned int s_mb_group_prealloc;
1264 unsigned int s_max_dir_size_kb;
1265 /* where last allocation was done - for stream allocation */
1266 unsigned long s_mb_last_group;
1267 unsigned long s_mb_last_start;
1269 /* stats for buddy allocator */
1270 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1271 atomic_t s_bal_success; /* we found long enough chunks */
1272 atomic_t s_bal_allocated; /* in blocks */
1273 atomic_t s_bal_ex_scanned; /* total extents scanned */
1274 atomic_t s_bal_goals; /* goal hits */
1275 atomic_t s_bal_breaks; /* too long searches */
1276 atomic_t s_bal_2orders; /* 2^order hits */
1277 spinlock_t s_bal_lock;
1278 unsigned long s_mb_buddies_generated;
1279 unsigned long long s_mb_generation_time;
1280 atomic_t s_mb_lost_chunks;
1281 atomic_t s_mb_preallocated;
1282 atomic_t s_mb_discarded;
1283 atomic_t s_lock_busy;
1285 /* locality groups */
1286 struct ext4_locality_group __percpu *s_locality_groups;
1288 /* for write statistics */
1289 unsigned long s_sectors_written_start;
1290 u64 s_kbytes_written;
1292 /* the size of zero-out chunk */
1293 unsigned int s_extent_max_zeroout_kb;
1295 unsigned int s_log_groups_per_flex;
1296 struct flex_groups *s_flex_groups;
1297 ext4_group_t s_flex_groups_allocated;
1299 /* workqueue for reserved extent conversions (buffered io) */
1300 struct workqueue_struct *rsv_conversion_wq;
1302 /* timer for periodic error stats printing */
1303 struct timer_list s_err_report;
1305 /* Lazy inode table initialization info */
1306 struct ext4_li_request *s_li_request;
1307 /* Wait multiplier for lazy initialization thread */
1308 unsigned int s_li_wait_mult;
1310 /* Kernel thread for multiple mount protection */
1311 struct task_struct *s_mmp_tsk;
1313 /* record the last minlen when FITRIM is called. */
1314 atomic_t s_last_trim_minblks;
1316 /* Reference to checksum algorithm driver via cryptoapi */
1317 struct crypto_shash *s_chksum_driver;
1319 /* Precomputed FS UUID checksum for seeding other checksums */
1322 /* Reclaim extents from extent status tree */
1323 struct shrinker s_es_shrinker;
1324 struct list_head s_es_list;
1326 struct ext4_es_stats s_es_stats;
1327 struct mb_cache *s_mb_cache;
1328 spinlock_t s_es_lock ____cacheline_aligned_in_smp;
1330 /* Ratelimit ext4 messages. */
1331 struct ratelimit_state s_err_ratelimit_state;
1332 struct ratelimit_state s_warning_ratelimit_state;
1333 struct ratelimit_state s_msg_ratelimit_state;
1336 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1338 return sb->s_fs_info;
1340 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1342 return container_of(inode, struct ext4_inode_info, vfs_inode);
1345 static inline struct timespec ext4_current_time(struct inode *inode)
1347 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1348 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1351 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1353 return ino == EXT4_ROOT_INO ||
1354 ino == EXT4_USR_QUOTA_INO ||
1355 ino == EXT4_GRP_QUOTA_INO ||
1356 ino == EXT4_BOOT_LOADER_INO ||
1357 ino == EXT4_JOURNAL_INO ||
1358 ino == EXT4_RESIZE_INO ||
1359 (ino >= EXT4_FIRST_INO(sb) &&
1360 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1363 static inline void ext4_set_io_unwritten_flag(struct inode *inode,
1364 struct ext4_io_end *io_end)
1366 if (!(io_end->flag & EXT4_IO_END_UNWRITTEN)) {
1367 io_end->flag |= EXT4_IO_END_UNWRITTEN;
1368 atomic_inc(&EXT4_I(inode)->i_unwritten);
1372 static inline ext4_io_end_t *ext4_inode_aio(struct inode *inode)
1374 return inode->i_private;
1377 static inline void ext4_inode_aio_set(struct inode *inode, ext4_io_end_t *io)
1379 inode->i_private = io;
1383 * Inode dynamic state flags
1386 EXT4_STATE_JDATA, /* journaled data exists */
1387 EXT4_STATE_NEW, /* inode is newly created */
1388 EXT4_STATE_XATTR, /* has in-inode xattrs */
1389 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1390 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1391 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1392 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1393 EXT4_STATE_NEWENTRY, /* File just added to dir */
1394 EXT4_STATE_DIOREAD_LOCK, /* Disable support for dio read
1396 EXT4_STATE_MAY_INLINE_DATA, /* may have in-inode data */
1397 EXT4_STATE_ORDERED_MODE, /* data=ordered mode */
1398 EXT4_STATE_EXT_PRECACHED, /* extents have been precached */
1401 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1402 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1404 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1406 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1408 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1410 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1412 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1415 /* Add these declarations here only so that these functions can be
1416 * found by name. Otherwise, they are very hard to locate. */
1417 static inline int ext4_test_inode_flag(struct inode *inode, int bit);
1418 static inline void ext4_set_inode_flag(struct inode *inode, int bit);
1419 static inline void ext4_clear_inode_flag(struct inode *inode, int bit);
1420 EXT4_INODE_BIT_FNS(flag, flags, 0)
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_state(struct inode *inode, int bit);
1425 static inline void ext4_set_inode_state(struct inode *inode, int bit);
1426 static inline void ext4_clear_inode_state(struct inode *inode, int bit);
1427 #if (BITS_PER_LONG < 64)
1428 EXT4_INODE_BIT_FNS(state, state_flags, 0)
1430 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1432 (ei)->i_state_flags = 0;
1435 EXT4_INODE_BIT_FNS(state, flags, 32)
1437 static inline void ext4_clear_state_flags(struct ext4_inode_info *ei)
1439 /* We depend on the fact that callers will set i_flags */
1443 /* Assume that user mode programs are passing in an ext4fs superblock, not
1444 * a kernel struct super_block. This will allow us to call the feature-test
1445 * macros from user land. */
1446 #define EXT4_SB(sb) (sb)
1449 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1452 * Codes for operating systems
1454 #define EXT4_OS_LINUX 0
1455 #define EXT4_OS_HURD 1
1456 #define EXT4_OS_MASIX 2
1457 #define EXT4_OS_FREEBSD 3
1458 #define EXT4_OS_LITES 4
1463 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1464 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1466 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1467 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1469 #define EXT4_GOOD_OLD_INODE_SIZE 128
1472 * Feature set definitions
1475 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1476 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1477 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1478 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1479 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1480 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1481 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1482 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1483 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1484 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1485 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1486 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1487 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1488 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1489 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1490 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1491 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1492 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1494 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1495 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1496 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1497 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1498 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1499 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1500 #define EXT4_FEATURE_COMPAT_SPARSE_SUPER2 0x0200
1502 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1503 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1504 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1505 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1506 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1507 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1508 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1509 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1510 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1512 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1513 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1514 * all other data structures' checksums. However, the METADATA_CSUM and
1515 * GDT_CSUM bits are mutually exclusive.
1517 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1519 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1520 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1521 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1522 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1523 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1524 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1525 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1526 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1527 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1528 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1529 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1530 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1531 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1532 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1534 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1535 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1536 EXT4_FEATURE_INCOMPAT_META_BG)
1537 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1538 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1539 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1541 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1542 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1543 EXT4_FEATURE_INCOMPAT_RECOVER| \
1544 EXT4_FEATURE_INCOMPAT_META_BG)
1545 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1546 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1547 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1549 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1550 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1551 EXT4_FEATURE_INCOMPAT_RECOVER| \
1552 EXT4_FEATURE_INCOMPAT_META_BG| \
1553 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1554 EXT4_FEATURE_INCOMPAT_64BIT| \
1555 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1556 EXT4_FEATURE_INCOMPAT_MMP | \
1557 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1558 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1559 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1560 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1561 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1562 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1563 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1564 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1565 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1566 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1567 EXT4_FEATURE_RO_COMPAT_QUOTA)
1570 * Default values for user and/or group using reserved blocks
1572 #define EXT4_DEF_RESUID 0
1573 #define EXT4_DEF_RESGID 0
1575 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1578 * Default mount options
1580 #define EXT4_DEFM_DEBUG 0x0001
1581 #define EXT4_DEFM_BSDGROUPS 0x0002
1582 #define EXT4_DEFM_XATTR_USER 0x0004
1583 #define EXT4_DEFM_ACL 0x0008
1584 #define EXT4_DEFM_UID16 0x0010
1585 #define EXT4_DEFM_JMODE 0x0060
1586 #define EXT4_DEFM_JMODE_DATA 0x0020
1587 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1588 #define EXT4_DEFM_JMODE_WBACK 0x0060
1589 #define EXT4_DEFM_NOBARRIER 0x0100
1590 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1591 #define EXT4_DEFM_DISCARD 0x0400
1592 #define EXT4_DEFM_NODELALLOC 0x0800
1595 * Default journal batch times
1597 #define EXT4_DEF_MIN_BATCH_TIME 0
1598 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1601 * Minimum number of groups in a flexgroup before we separate out
1602 * directories into the first block group of a flexgroup
1604 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1607 * Structure of a directory entry
1609 #define EXT4_NAME_LEN 255
1611 struct ext4_dir_entry {
1612 __le32 inode; /* Inode number */
1613 __le16 rec_len; /* Directory entry length */
1614 __le16 name_len; /* Name length */
1615 char name[EXT4_NAME_LEN]; /* File name */
1619 * The new version of the directory entry. Since EXT4 structures are
1620 * stored in intel byte order, and the name_len field could never be
1621 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1624 struct ext4_dir_entry_2 {
1625 __le32 inode; /* Inode number */
1626 __le16 rec_len; /* Directory entry length */
1627 __u8 name_len; /* Name length */
1629 char name[EXT4_NAME_LEN]; /* File name */
1633 * This is a bogus directory entry at the end of each leaf block that
1634 * records checksums.
1636 struct ext4_dir_entry_tail {
1637 __le32 det_reserved_zero1; /* Pretend to be unused */
1638 __le16 det_rec_len; /* 12 */
1639 __u8 det_reserved_zero2; /* Zero name length */
1640 __u8 det_reserved_ft; /* 0xDE, fake file type */
1641 __le32 det_checksum; /* crc32c(uuid+inum+dirblock) */
1644 #define EXT4_DIRENT_TAIL(block, blocksize) \
1645 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1647 sizeof(struct ext4_dir_entry_tail))))
1650 * Ext4 directory file types. Only the low 3 bits are used. The
1651 * other bits are reserved for now.
1653 #define EXT4_FT_UNKNOWN 0
1654 #define EXT4_FT_REG_FILE 1
1655 #define EXT4_FT_DIR 2
1656 #define EXT4_FT_CHRDEV 3
1657 #define EXT4_FT_BLKDEV 4
1658 #define EXT4_FT_FIFO 5
1659 #define EXT4_FT_SOCK 6
1660 #define EXT4_FT_SYMLINK 7
1662 #define EXT4_FT_MAX 8
1664 #define EXT4_FT_DIR_CSUM 0xDE
1667 * EXT4_DIR_PAD defines the directory entries boundaries
1669 * NOTE: It must be a multiple of 4
1671 #define EXT4_DIR_PAD 4
1672 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1673 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1675 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1678 * If we ever get support for fs block sizes > page_size, we'll need
1679 * to remove the #if statements in the next two functions...
1681 static inline unsigned int
1682 ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize)
1684 unsigned len = le16_to_cpu(dlen);
1686 #if (PAGE_CACHE_SIZE >= 65536)
1687 if (len == EXT4_MAX_REC_LEN || len == 0)
1689 return (len & 65532) | ((len & 3) << 16);
1695 static inline __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize)
1697 if ((len > blocksize) || (blocksize > (1 << 18)) || (len & 3))
1699 #if (PAGE_CACHE_SIZE >= 65536)
1701 return cpu_to_le16(len);
1702 if (len == blocksize) {
1703 if (blocksize == 65536)
1704 return cpu_to_le16(EXT4_MAX_REC_LEN);
1706 return cpu_to_le16(0);
1708 return cpu_to_le16((len & 65532) | ((len >> 16) & 3));
1710 return cpu_to_le16(len);
1715 * Hash Tree Directory indexing
1716 * (c) Daniel Phillips, 2001
1719 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1720 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1721 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1722 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1723 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1725 /* Legal values for the dx_root hash_version field: */
1727 #define DX_HASH_LEGACY 0
1728 #define DX_HASH_HALF_MD4 1
1729 #define DX_HASH_TEA 2
1730 #define DX_HASH_LEGACY_UNSIGNED 3
1731 #define DX_HASH_HALF_MD4_UNSIGNED 4
1732 #define DX_HASH_TEA_UNSIGNED 5
1734 static inline u32 ext4_chksum(struct ext4_sb_info *sbi, u32 crc,
1735 const void *address, unsigned int length)
1738 struct shash_desc shash;
1743 BUG_ON(crypto_shash_descsize(sbi->s_chksum_driver)!=sizeof(desc.ctx));
1745 desc.shash.tfm = sbi->s_chksum_driver;
1746 desc.shash.flags = 0;
1747 *(u32 *)desc.ctx = crc;
1749 err = crypto_shash_update(&desc.shash, address, length);
1752 return *(u32 *)desc.ctx;
1757 /* hash info structure used by the directory hash */
1767 /* 32 and 64 bit signed EOF for dx directories */
1768 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1769 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1773 * Control parameters used by ext4_htree_next_block
1775 #define HASH_NB_ALWAYS 1
1779 * Describe an inode's exact location on disk and in memory
1783 struct buffer_head *bh;
1784 unsigned long offset;
1785 ext4_group_t block_group;
1788 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1790 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1794 * This structure is stuffed into the struct file's private_data field
1795 * for directories. It is where we put information so that we can do
1796 * readdir operations in hash tree order.
1798 struct dir_private_info {
1799 struct rb_root root;
1800 struct rb_node *curr_node;
1801 struct fname *extra_fname;
1804 __u32 curr_minor_hash;
1808 /* calculate the first block number of the group */
1809 static inline ext4_fsblk_t
1810 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1812 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1813 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1817 * Special error return code only used by dx_probe() and its callers.
1819 #define ERR_BAD_DX_DIR (-(MAX_ERRNO - 1))
1822 * Timeout and state flag for lazy initialization inode thread.
1824 #define EXT4_DEF_LI_WAIT_MULT 10
1825 #define EXT4_DEF_LI_MAX_START_DELAY 5
1826 #define EXT4_LAZYINIT_QUIT 0x0001
1827 #define EXT4_LAZYINIT_RUNNING 0x0002
1830 * Lazy inode table initialization info
1832 struct ext4_lazy_init {
1833 unsigned long li_state;
1834 struct list_head li_request_list;
1835 struct mutex li_list_mtx;
1838 struct ext4_li_request {
1839 struct super_block *lr_super;
1840 struct ext4_sb_info *lr_sbi;
1841 ext4_group_t lr_next_group;
1842 struct list_head lr_request;
1843 unsigned long lr_next_sched;
1844 unsigned long lr_timeout;
1847 struct ext4_features {
1848 struct kobject f_kobj;
1849 struct completion f_kobj_unregister;
1853 * This structure will be used for multiple mount protection. It will be
1854 * written into the block number saved in the s_mmp_block field in the
1855 * superblock. Programs that check MMP should assume that if
1856 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1857 * to use the filesystem, regardless of how old the timestamp is.
1859 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1860 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1861 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1862 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1865 __le32 mmp_magic; /* Magic number for MMP */
1866 __le32 mmp_seq; /* Sequence no. updated periodically */
1869 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1870 * purposes and do not affect the correctness of the algorithm
1872 __le64 mmp_time; /* Time last updated */
1873 char mmp_nodename[64]; /* Node which last updated MMP block */
1874 char mmp_bdevname[32]; /* Bdev which last updated MMP block */
1877 * mmp_check_interval is used to verify if the MMP block has been
1878 * updated on the block device. The value is updated based on the
1879 * maximum time to write the MMP block during an update cycle.
1881 __le16 mmp_check_interval;
1884 __le32 mmp_pad2[226];
1885 __le32 mmp_checksum; /* crc32c(uuid+mmp_block) */
1888 /* arguments passed to the mmp thread */
1890 struct buffer_head *bh; /* bh from initial read_mmp_block() */
1891 struct super_block *sb; /* super block of the fs */
1895 * Check interval multiplier
1896 * The MMP block is written every update interval and initially checked every
1897 * update interval x the multiplier (the value is then adapted based on the
1898 * write latency). The reason is that writes can be delayed under load and we
1899 * don't want readers to incorrectly assume that the filesystem is no longer
1902 #define EXT4_MMP_CHECK_MULT 2UL
1905 * Minimum interval for MMP checking in seconds.
1907 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1910 * Maximum interval for MMP checking in seconds.
1912 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1915 * Function prototypes
1919 * Ok, these declarations are also in <linux/kernel.h> but none of the
1920 * ext4 source programs needs to include it so they are duplicated here.
1922 # define NORET_TYPE /**/
1923 # define ATTRIB_NORET __attribute__((noreturn))
1924 # define NORET_AND noreturn,
1927 extern unsigned int ext4_count_free(char *bitmap, unsigned numchars);
1928 void ext4_inode_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1929 struct ext4_group_desc *gdp,
1930 struct buffer_head *bh, int sz);
1931 int ext4_inode_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1932 struct ext4_group_desc *gdp,
1933 struct buffer_head *bh, int sz);
1934 void ext4_block_bitmap_csum_set(struct super_block *sb, ext4_group_t group,
1935 struct ext4_group_desc *gdp,
1936 struct buffer_head *bh);
1937 int ext4_block_bitmap_csum_verify(struct super_block *sb, ext4_group_t group,
1938 struct ext4_group_desc *gdp,
1939 struct buffer_head *bh);
1942 extern void ext4_get_group_no_and_offset(struct super_block *sb,
1943 ext4_fsblk_t blocknr,
1944 ext4_group_t *blockgrpp,
1945 ext4_grpblk_t *offsetp);
1946 extern ext4_group_t ext4_get_group_number(struct super_block *sb,
1947 ext4_fsblk_t block);
1949 extern unsigned int ext4_block_group(struct super_block *sb,
1950 ext4_fsblk_t blocknr);
1951 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1952 ext4_fsblk_t blocknr);
1953 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1954 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1955 ext4_group_t group);
1956 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1959 unsigned long *count,
1961 extern int ext4_claim_free_clusters(struct ext4_sb_info *sbi,
1962 s64 nclusters, unsigned int flags);
1963 extern ext4_fsblk_t ext4_count_free_clusters(struct super_block *);
1964 extern void ext4_check_blocks_bitmap(struct super_block *);
1965 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1966 ext4_group_t block_group,
1967 struct buffer_head ** bh);
1968 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1970 extern struct buffer_head *ext4_read_block_bitmap_nowait(struct super_block *sb,
1971 ext4_group_t block_group);
1972 extern int ext4_wait_block_bitmap(struct super_block *sb,
1973 ext4_group_t block_group,
1974 struct buffer_head *bh);
1975 extern struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1976 ext4_group_t block_group);
1977 extern unsigned ext4_free_clusters_after_init(struct super_block *sb,
1978 ext4_group_t block_group,
1979 struct ext4_group_desc *gdp);
1980 ext4_fsblk_t ext4_inode_to_goal_block(struct inode *);
1983 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode *,
1985 struct ext4_dir_entry_2 *,
1986 struct buffer_head *, char *, int,
1988 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1989 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1990 (de), (bh), (buf), (size), (offset)))
1991 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1993 struct ext4_dir_entry_2 *dirent);
1994 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1995 extern int ext4_find_dest_de(struct inode *dir, struct inode *inode,
1996 struct buffer_head *bh,
1997 void *buf, int buf_size,
1998 const char *name, int namelen,
1999 struct ext4_dir_entry_2 **dest_de);
2000 void ext4_insert_dentry(struct inode *inode,
2001 struct ext4_dir_entry_2 *de,
2003 const char *name, int namelen);
2004 static inline void ext4_update_dx_flag(struct inode *inode)
2006 if (!EXT4_HAS_COMPAT_FEATURE(inode->i_sb,
2007 EXT4_FEATURE_COMPAT_DIR_INDEX))
2008 ext4_clear_inode_flag(inode, EXT4_INODE_INDEX);
2010 static unsigned char ext4_filetype_table[] = {
2011 DT_UNKNOWN, DT_REG, DT_DIR, DT_CHR, DT_BLK, DT_FIFO, DT_SOCK, DT_LNK
2014 static inline unsigned char get_dtype(struct super_block *sb, int filetype)
2016 if (!EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE) ||
2017 (filetype >= EXT4_FT_MAX))
2020 return ext4_filetype_table[filetype];
2022 extern int ext4_check_all_de(struct inode *dir, struct buffer_head *bh,
2023 void *buf, int buf_size);
2026 extern int ext4_sync_file(struct file *, loff_t, loff_t, int);
2029 extern int ext4fs_dirhash(const char *name, int len, struct
2030 dx_hash_info *hinfo);
2033 extern struct inode *__ext4_new_inode(handle_t *, struct inode *, umode_t,
2034 const struct qstr *qstr, __u32 goal,
2035 uid_t *owner, int handle_type,
2036 unsigned int line_no, int nblocks);
2038 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2039 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2041 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2043 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2044 (type), __LINE__, (nblocks))
2047 extern void ext4_free_inode(handle_t *, struct inode *);
2048 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
2049 extern unsigned long ext4_count_free_inodes(struct super_block *);
2050 extern unsigned long ext4_count_dirs(struct super_block *);
2051 extern void ext4_check_inodes_bitmap(struct super_block *);
2052 extern void ext4_mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
2053 extern int ext4_init_inode_table(struct super_block *sb,
2054 ext4_group_t group, int barrier);
2055 extern void ext4_end_bitmap_read(struct buffer_head *bh, int uptodate);
2058 extern long ext4_mb_stats;
2059 extern long ext4_mb_max_to_scan;
2060 extern int ext4_mb_init(struct super_block *);
2061 extern int ext4_mb_release(struct super_block *);
2062 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
2063 struct ext4_allocation_request *, int *);
2064 extern int ext4_mb_reserve_blocks(struct super_block *, int);
2065 extern void ext4_discard_preallocations(struct inode *);
2066 extern int __init ext4_init_mballoc(void);
2067 extern void ext4_exit_mballoc(void);
2068 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
2069 struct buffer_head *bh, ext4_fsblk_t block,
2070 unsigned long count, int flags);
2071 extern int ext4_mb_alloc_groupinfo(struct super_block *sb,
2072 ext4_group_t ngroups);
2073 extern int ext4_mb_add_groupinfo(struct super_block *sb,
2074 ext4_group_t i, struct ext4_group_desc *desc);
2075 extern int ext4_group_add_blocks(handle_t *handle, struct super_block *sb,
2076 ext4_fsblk_t block, unsigned long count);
2077 extern int ext4_trim_fs(struct super_block *, struct fstrim_range *);
2080 struct buffer_head *ext4_getblk(handle_t *, struct inode *, ext4_lblk_t, int);
2081 struct buffer_head *ext4_bread(handle_t *, struct inode *, ext4_lblk_t, int);
2082 int ext4_get_block_write(struct inode *inode, sector_t iblock,
2083 struct buffer_head *bh_result, int create);
2084 int ext4_get_block(struct inode *inode, sector_t iblock,
2085 struct buffer_head *bh_result, int create);
2086 int ext4_da_get_block_prep(struct inode *inode, sector_t iblock,
2087 struct buffer_head *bh, int create);
2088 int ext4_walk_page_buffers(handle_t *handle,
2089 struct buffer_head *head,
2093 int (*fn)(handle_t *handle,
2094 struct buffer_head *bh));
2095 int do_journal_get_write_access(handle_t *handle,
2096 struct buffer_head *bh);
2097 #define FALL_BACK_TO_NONDELALLOC 1
2098 #define CONVERT_INLINE_DATA 2
2100 extern struct inode *ext4_iget(struct super_block *, unsigned long);
2101 extern struct inode *ext4_iget_normal(struct super_block *, unsigned long);
2102 extern int ext4_write_inode(struct inode *, struct writeback_control *);
2103 extern int ext4_setattr(struct dentry *, struct iattr *);
2104 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
2105 struct kstat *stat);
2106 extern void ext4_evict_inode(struct inode *);
2107 extern void ext4_clear_inode(struct inode *);
2108 extern int ext4_sync_inode(handle_t *, struct inode *);
2109 extern void ext4_dirty_inode(struct inode *, int);
2110 extern int ext4_change_inode_journal_flag(struct inode *, int);
2111 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
2112 extern int ext4_inode_attach_jinode(struct inode *inode);
2113 extern int ext4_can_truncate(struct inode *inode);
2114 extern void ext4_truncate(struct inode *);
2115 extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length);
2116 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
2117 extern void ext4_set_inode_flags(struct inode *);
2118 extern void ext4_get_inode_flags(struct ext4_inode_info *);
2119 extern int ext4_alloc_da_blocks(struct inode *inode);
2120 extern void ext4_set_aops(struct inode *inode);
2121 extern int ext4_writepage_trans_blocks(struct inode *);
2122 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
2123 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
2124 loff_t lstart, loff_t lend);
2125 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
2126 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
2127 extern void ext4_da_update_reserve_space(struct inode *inode,
2128 int used, int quota_claim);
2131 extern int ext4_ind_map_blocks(handle_t *handle, struct inode *inode,
2132 struct ext4_map_blocks *map, int flags);
2133 extern ssize_t ext4_ind_direct_IO(int rw, struct kiocb *iocb,
2134 struct iov_iter *iter, loff_t offset);
2135 extern int ext4_ind_calc_metadata_amount(struct inode *inode, sector_t lblock);
2136 extern int ext4_ind_trans_blocks(struct inode *inode, int nrblocks);
2137 extern void ext4_ind_truncate(handle_t *, struct inode *inode);
2138 extern int ext4_ind_remove_space(handle_t *handle, struct inode *inode,
2139 ext4_lblk_t start, ext4_lblk_t end);
2142 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
2143 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
2146 extern int ext4_ext_migrate(struct inode *);
2147 extern int ext4_ind_migrate(struct inode *inode);
2150 extern int ext4_dirent_csum_verify(struct inode *inode,
2151 struct ext4_dir_entry *dirent);
2152 extern int ext4_orphan_add(handle_t *, struct inode *);
2153 extern int ext4_orphan_del(handle_t *, struct inode *);
2154 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
2155 __u32 start_minor_hash, __u32 *next_hash);
2156 extern int search_dir(struct buffer_head *bh,
2160 const struct qstr *d_name,
2161 unsigned int offset,
2162 struct ext4_dir_entry_2 **res_dir);
2163 extern int ext4_generic_delete_entry(handle_t *handle,
2165 struct ext4_dir_entry_2 *de_del,
2166 struct buffer_head *bh,
2172 extern int ext4_group_add(struct super_block *sb,
2173 struct ext4_new_group_data *input);
2174 extern int ext4_group_extend(struct super_block *sb,
2175 struct ext4_super_block *es,
2176 ext4_fsblk_t n_blocks_count);
2177 extern int ext4_resize_fs(struct super_block *sb, ext4_fsblk_t n_blocks_count);
2180 extern int ext4_calculate_overhead(struct super_block *sb);
2181 extern void ext4_superblock_csum_set(struct super_block *sb);
2182 extern void *ext4_kvmalloc(size_t size, gfp_t flags);
2183 extern void *ext4_kvzalloc(size_t size, gfp_t flags);
2184 extern int ext4_alloc_flex_bg_array(struct super_block *sb,
2185 ext4_group_t ngroup);
2186 extern const char *ext4_decode_error(struct super_block *sb, int errno,
2189 extern __printf(4, 5)
2190 void __ext4_error(struct super_block *, const char *, unsigned int,
2192 extern __printf(5, 6)
2193 void __ext4_error_inode(struct inode *, const char *, unsigned int, ext4_fsblk_t,
2195 extern __printf(5, 6)
2196 void __ext4_error_file(struct file *, const char *, unsigned int, ext4_fsblk_t,
2198 extern void __ext4_std_error(struct super_block *, const char *,
2200 extern __printf(4, 5)
2201 void __ext4_abort(struct super_block *, const char *, unsigned int,
2203 extern __printf(4, 5)
2204 void __ext4_warning(struct super_block *, const char *, unsigned int,
2206 extern __printf(3, 4)
2207 void __ext4_msg(struct super_block *, const char *, const char *, ...);
2208 extern void __dump_mmp_msg(struct super_block *, struct mmp_struct *mmp,
2209 const char *, unsigned int, const char *);
2210 extern __printf(7, 8)
2211 void __ext4_grp_locked_error(const char *, unsigned int,
2212 struct super_block *, ext4_group_t,
2213 unsigned long, ext4_fsblk_t,
2216 #ifdef CONFIG_PRINTK
2218 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2219 __ext4_error_inode(inode, func, line, block, fmt, ##__VA_ARGS__)
2220 #define ext4_error_file(file, func, line, block, fmt, ...) \
2221 __ext4_error_file(file, func, line, block, fmt, ##__VA_ARGS__)
2222 #define ext4_error(sb, fmt, ...) \
2223 __ext4_error(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2224 #define ext4_abort(sb, fmt, ...) \
2225 __ext4_abort(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2226 #define ext4_warning(sb, fmt, ...) \
2227 __ext4_warning(sb, __func__, __LINE__, fmt, ##__VA_ARGS__)
2228 #define ext4_msg(sb, level, fmt, ...) \
2229 __ext4_msg(sb, level, fmt, ##__VA_ARGS__)
2230 #define dump_mmp_msg(sb, mmp, msg) \
2231 __dump_mmp_msg(sb, mmp, __func__, __LINE__, msg)
2232 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2233 __ext4_grp_locked_error(__func__, __LINE__, sb, grp, ino, block, \
2238 #define ext4_error_inode(inode, func, line, block, fmt, ...) \
2240 no_printk(fmt, ##__VA_ARGS__); \
2241 __ext4_error_inode(inode, "", 0, block, " "); \
2243 #define ext4_error_file(file, func, line, block, fmt, ...) \
2245 no_printk(fmt, ##__VA_ARGS__); \
2246 __ext4_error_file(file, "", 0, block, " "); \
2248 #define ext4_error(sb, fmt, ...) \
2250 no_printk(fmt, ##__VA_ARGS__); \
2251 __ext4_error(sb, "", 0, " "); \
2253 #define ext4_abort(sb, fmt, ...) \
2255 no_printk(fmt, ##__VA_ARGS__); \
2256 __ext4_abort(sb, "", 0, " "); \
2258 #define ext4_warning(sb, fmt, ...) \
2260 no_printk(fmt, ##__VA_ARGS__); \
2261 __ext4_warning(sb, "", 0, " "); \
2263 #define ext4_msg(sb, level, fmt, ...) \
2265 no_printk(fmt, ##__VA_ARGS__); \
2266 __ext4_msg(sb, "", " "); \
2268 #define dump_mmp_msg(sb, mmp, msg) \
2269 __dump_mmp_msg(sb, mmp, "", 0, "")
2270 #define ext4_grp_locked_error(sb, grp, ino, block, fmt, ...) \
2272 no_printk(fmt, ##__VA_ARGS__); \
2273 __ext4_grp_locked_error("", 0, sb, grp, ino, block, " "); \
2278 extern void ext4_update_dynamic_rev(struct super_block *sb);
2279 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
2281 extern int ext4_update_rocompat_feature(handle_t *handle,
2282 struct super_block *sb, __u32 rocompat);
2283 extern int ext4_update_incompat_feature(handle_t *handle,
2284 struct super_block *sb, __u32 incompat);
2285 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
2286 struct ext4_group_desc *bg);
2287 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
2288 struct ext4_group_desc *bg);
2289 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
2290 struct ext4_group_desc *bg);
2291 extern __u32 ext4_free_group_clusters(struct super_block *sb,
2292 struct ext4_group_desc *bg);
2293 extern __u32 ext4_free_inodes_count(struct super_block *sb,
2294 struct ext4_group_desc *bg);
2295 extern __u32 ext4_used_dirs_count(struct super_block *sb,
2296 struct ext4_group_desc *bg);
2297 extern __u32 ext4_itable_unused_count(struct super_block *sb,
2298 struct ext4_group_desc *bg);
2299 extern void ext4_block_bitmap_set(struct super_block *sb,
2300 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2301 extern void ext4_inode_bitmap_set(struct super_block *sb,
2302 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2303 extern void ext4_inode_table_set(struct super_block *sb,
2304 struct ext4_group_desc *bg, ext4_fsblk_t blk);
2305 extern void ext4_free_group_clusters_set(struct super_block *sb,
2306 struct ext4_group_desc *bg,
2308 extern void ext4_free_inodes_set(struct super_block *sb,
2309 struct ext4_group_desc *bg, __u32 count);
2310 extern void ext4_used_dirs_set(struct super_block *sb,
2311 struct ext4_group_desc *bg, __u32 count);
2312 extern void ext4_itable_unused_set(struct super_block *sb,
2313 struct ext4_group_desc *bg, __u32 count);
2314 extern int ext4_group_desc_csum_verify(struct super_block *sb, __u32 group,
2315 struct ext4_group_desc *gdp);
2316 extern void ext4_group_desc_csum_set(struct super_block *sb, __u32 group,
2317 struct ext4_group_desc *gdp);
2318 extern int ext4_register_li_request(struct super_block *sb,
2319 ext4_group_t first_not_zeroed);
2321 static inline int ext4_has_group_desc_csum(struct super_block *sb)
2323 return EXT4_HAS_RO_COMPAT_FEATURE(sb,
2324 EXT4_FEATURE_RO_COMPAT_GDT_CSUM) ||
2325 (EXT4_SB(sb)->s_chksum_driver != NULL);
2328 static inline int ext4_has_metadata_csum(struct super_block *sb)
2330 WARN_ON_ONCE(EXT4_HAS_RO_COMPAT_FEATURE(sb,
2331 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) &&
2332 !EXT4_SB(sb)->s_chksum_driver);
2334 return (EXT4_SB(sb)->s_chksum_driver != NULL);
2336 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
2338 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
2339 le32_to_cpu(es->s_blocks_count_lo);
2342 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
2344 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
2345 le32_to_cpu(es->s_r_blocks_count_lo);
2348 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
2350 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
2351 le32_to_cpu(es->s_free_blocks_count_lo);
2354 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
2357 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
2358 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
2361 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
2364 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
2365 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
2368 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
2371 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
2372 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
2375 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
2377 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
2378 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
2379 le32_to_cpu(raw_inode->i_size_lo);
2381 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
2384 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
2386 raw_inode->i_size_lo = cpu_to_le32(i_size);
2387 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
2391 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
2394 struct ext4_group_info ***grp_info;
2395 long indexv, indexh;
2396 BUG_ON(group >= EXT4_SB(sb)->s_groups_count);
2397 grp_info = EXT4_SB(sb)->s_group_info;
2398 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
2399 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
2400 return grp_info[indexv][indexh];
2404 * Reading s_groups_count requires using smp_rmb() afterwards. See
2405 * the locking protocol documented in the comments of ext4_group_add()
2408 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
2410 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
2416 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
2417 ext4_group_t block_group)
2419 return block_group >> sbi->s_log_groups_per_flex;
2422 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
2424 return 1 << sbi->s_log_groups_per_flex;
2427 #define ext4_std_error(sb, errno) \
2430 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2434 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2435 * counters. So we need to make sure we have free clusters more
2436 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2438 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2440 #define EXT4_FREECLUSTERS_WATERMARK 0
2443 /* Update i_disksize. Requires i_mutex to avoid races with truncate */
2444 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
2446 WARN_ON_ONCE(S_ISREG(inode->i_mode) &&
2447 !mutex_is_locked(&inode->i_mutex));
2448 down_write(&EXT4_I(inode)->i_data_sem);
2449 if (newsize > EXT4_I(inode)->i_disksize)
2450 EXT4_I(inode)->i_disksize = newsize;
2451 up_write(&EXT4_I(inode)->i_data_sem);
2454 /* Update i_size, i_disksize. Requires i_mutex to avoid races with truncate */
2455 static inline int ext4_update_inode_size(struct inode *inode, loff_t newsize)
2459 if (newsize > inode->i_size) {
2460 i_size_write(inode, newsize);
2463 if (newsize > EXT4_I(inode)->i_disksize) {
2464 ext4_update_i_disksize(inode, newsize);
2470 struct ext4_group_info {
2471 unsigned long bb_state;
2472 struct rb_root bb_free_root;
2473 ext4_grpblk_t bb_first_free; /* first free block */
2474 ext4_grpblk_t bb_free; /* total free blocks */
2475 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
2476 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
2477 struct list_head bb_prealloc_list;
2481 struct rw_semaphore alloc_sem;
2482 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
2483 * regions, index is order.
2484 * bb_counters[3] = 5 means
2485 * 5 free 8-block regions. */
2488 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2489 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2490 #define EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT 2
2491 #define EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT 3
2493 #define EXT4_MB_GRP_NEED_INIT(grp) \
2494 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2495 #define EXT4_MB_GRP_BBITMAP_CORRUPT(grp) \
2496 (test_bit(EXT4_GROUP_INFO_BBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2497 #define EXT4_MB_GRP_IBITMAP_CORRUPT(grp) \
2498 (test_bit(EXT4_GROUP_INFO_IBITMAP_CORRUPT_BIT, &((grp)->bb_state)))
2500 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2501 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2502 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2503 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2504 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2505 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2507 #define EXT4_MAX_CONTENTION 8
2508 #define EXT4_CONTENTION_THRESHOLD 2
2510 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
2513 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
2517 * Returns true if the filesystem is busy enough that attempts to
2518 * access the block group locks has run into contention.
2520 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
2522 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
2525 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
2527 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
2528 if (spin_trylock(lock))
2530 * We're able to grab the lock right away, so drop the
2531 * lock contention counter.
2533 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
2536 * The lock is busy, so bump the contention counter,
2537 * and then wait on the spin lock.
2539 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
2540 EXT4_MAX_CONTENTION);
2545 static inline void ext4_unlock_group(struct super_block *sb,
2548 spin_unlock(ext4_group_lock_ptr(sb, group));
2552 * Block validity checking
2554 #define ext4_check_indirect_blockref(inode, bh) \
2555 ext4_check_blockref(__func__, __LINE__, inode, \
2556 (__le32 *)(bh)->b_data, \
2557 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2559 #define ext4_ind_check_inode(inode) \
2560 ext4_check_blockref(__func__, __LINE__, inode, \
2561 EXT4_I(inode)->i_data, \
2565 * Inodes and files operations
2569 extern const struct file_operations ext4_dir_operations;
2572 extern const struct inode_operations ext4_file_inode_operations;
2573 extern const struct file_operations ext4_file_operations;
2574 extern loff_t ext4_llseek(struct file *file, loff_t offset, int origin);
2577 extern int ext4_get_max_inline_size(struct inode *inode);
2578 extern int ext4_find_inline_data_nolock(struct inode *inode);
2579 extern int ext4_init_inline_data(handle_t *handle, struct inode *inode,
2581 extern int ext4_destroy_inline_data(handle_t *handle, struct inode *inode);
2583 extern int ext4_readpage_inline(struct inode *inode, struct page *page);
2584 extern int ext4_try_to_write_inline_data(struct address_space *mapping,
2585 struct inode *inode,
2586 loff_t pos, unsigned len,
2588 struct page **pagep);
2589 extern int ext4_write_inline_data_end(struct inode *inode,
2590 loff_t pos, unsigned len,
2593 extern struct buffer_head *
2594 ext4_journalled_write_inline_data(struct inode *inode,
2597 extern int ext4_da_write_inline_data_begin(struct address_space *mapping,
2598 struct inode *inode,
2599 loff_t pos, unsigned len,
2601 struct page **pagep,
2603 extern int ext4_da_write_inline_data_end(struct inode *inode, loff_t pos,
2604 unsigned len, unsigned copied,
2606 extern int ext4_try_add_inline_entry(handle_t *handle, struct dentry *dentry,
2607 struct inode *inode);
2608 extern int ext4_try_create_inline_dir(handle_t *handle,
2609 struct inode *parent,
2610 struct inode *inode);
2611 extern int ext4_read_inline_dir(struct file *filp,
2612 struct dir_context *ctx,
2613 int *has_inline_data);
2614 extern int htree_inlinedir_to_tree(struct file *dir_file,
2615 struct inode *dir, ext4_lblk_t block,
2616 struct dx_hash_info *hinfo,
2617 __u32 start_hash, __u32 start_minor_hash,
2618 int *has_inline_data);
2619 extern struct buffer_head *ext4_find_inline_entry(struct inode *dir,
2620 const struct qstr *d_name,
2621 struct ext4_dir_entry_2 **res_dir,
2622 int *has_inline_data);
2623 extern int ext4_delete_inline_entry(handle_t *handle,
2625 struct ext4_dir_entry_2 *de_del,
2626 struct buffer_head *bh,
2627 int *has_inline_data);
2628 extern int empty_inline_dir(struct inode *dir, int *has_inline_data);
2629 extern struct buffer_head *ext4_get_first_inline_block(struct inode *inode,
2630 struct ext4_dir_entry_2 **parent_de,
2632 extern int ext4_inline_data_fiemap(struct inode *inode,
2633 struct fiemap_extent_info *fieinfo,
2635 extern int ext4_try_to_evict_inline_data(handle_t *handle,
2636 struct inode *inode,
2638 extern void ext4_inline_data_truncate(struct inode *inode, int *has_inline);
2640 extern int ext4_convert_inline_data(struct inode *inode);
2642 static inline int ext4_has_inline_data(struct inode *inode)
2644 return ext4_test_inode_flag(inode, EXT4_INODE_INLINE_DATA) &&
2645 EXT4_I(inode)->i_inline_off;
2649 extern const struct inode_operations ext4_dir_inode_operations;
2650 extern const struct inode_operations ext4_special_inode_operations;
2651 extern struct dentry *ext4_get_parent(struct dentry *child);
2652 extern struct ext4_dir_entry_2 *ext4_init_dot_dotdot(struct inode *inode,
2653 struct ext4_dir_entry_2 *de,
2654 int blocksize, int csum_size,
2655 unsigned int parent_ino, int dotdot_real_len);
2656 extern void initialize_dirent_tail(struct ext4_dir_entry_tail *t,
2657 unsigned int blocksize);
2658 extern int ext4_handle_dirty_dirent_node(handle_t *handle,
2659 struct inode *inode,
2660 struct buffer_head *bh);
2662 static unsigned char ext4_type_by_mode[S_IFMT >> S_SHIFT] = {
2663 [S_IFREG >> S_SHIFT] = EXT4_FT_REG_FILE,
2664 [S_IFDIR >> S_SHIFT] = EXT4_FT_DIR,
2665 [S_IFCHR >> S_SHIFT] = EXT4_FT_CHRDEV,
2666 [S_IFBLK >> S_SHIFT] = EXT4_FT_BLKDEV,
2667 [S_IFIFO >> S_SHIFT] = EXT4_FT_FIFO,
2668 [S_IFSOCK >> S_SHIFT] = EXT4_FT_SOCK,
2669 [S_IFLNK >> S_SHIFT] = EXT4_FT_SYMLINK,
2672 static inline void ext4_set_de_type(struct super_block *sb,
2673 struct ext4_dir_entry_2 *de,
2675 if (EXT4_HAS_INCOMPAT_FEATURE(sb, EXT4_FEATURE_INCOMPAT_FILETYPE))
2676 de->file_type = ext4_type_by_mode[(mode & S_IFMT)>>S_SHIFT];
2681 extern const struct inode_operations ext4_symlink_inode_operations;
2682 extern const struct inode_operations ext4_fast_symlink_inode_operations;
2684 /* block_validity */
2685 extern void ext4_release_system_zone(struct super_block *sb);
2686 extern int ext4_setup_system_zone(struct super_block *sb);
2687 extern int __init ext4_init_system_zone(void);
2688 extern void ext4_exit_system_zone(void);
2689 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
2690 ext4_fsblk_t start_blk,
2691 unsigned int count);
2692 extern int ext4_check_blockref(const char *, unsigned int,
2693 struct inode *, __le32 *, unsigned int);
2696 struct ext4_ext_path;
2700 * Maximum number of logical blocks in a file; ext4_extent's ee_block is
2703 #define EXT_MAX_BLOCKS 0xffffffff
2705 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
2706 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
2707 extern int ext4_ext_index_trans_blocks(struct inode *inode, int extents);
2708 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
2709 struct ext4_map_blocks *map, int flags);
2710 extern void ext4_ext_truncate(handle_t *, struct inode *);
2711 extern int ext4_ext_remove_space(struct inode *inode, ext4_lblk_t start,
2713 extern void ext4_ext_init(struct super_block *);
2714 extern void ext4_ext_release(struct super_block *);
2715 extern long ext4_fallocate(struct file *file, int mode, loff_t offset,
2717 extern int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode,
2718 loff_t offset, ssize_t len);
2719 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
2720 struct ext4_map_blocks *map, int flags);
2721 extern int ext4_ext_calc_metadata_amount(struct inode *inode,
2722 ext4_lblk_t lblocks);
2723 extern int ext4_extent_tree_init(handle_t *, struct inode *);
2724 extern int ext4_ext_calc_credits_for_single_extent(struct inode *inode,
2726 struct ext4_ext_path *path);
2727 extern int ext4_can_extents_be_merged(struct inode *inode,
2728 struct ext4_extent *ex1,
2729 struct ext4_extent *ex2);
2730 extern int ext4_ext_insert_extent(handle_t *, struct inode *,
2731 struct ext4_ext_path **,
2732 struct ext4_extent *, int);
2733 extern struct ext4_ext_path *ext4_find_extent(struct inode *, ext4_lblk_t,
2734 struct ext4_ext_path **,
2736 extern void ext4_ext_drop_refs(struct ext4_ext_path *);
2737 extern int ext4_ext_check_inode(struct inode *inode);
2738 extern int ext4_find_delalloc_range(struct inode *inode,
2739 ext4_lblk_t lblk_start,
2740 ext4_lblk_t lblk_end);
2741 extern int ext4_find_delalloc_cluster(struct inode *inode, ext4_lblk_t lblk);
2742 extern ext4_lblk_t ext4_ext_next_allocated_block(struct ext4_ext_path *path);
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);
2747 extern int ext4_swap_extents(handle_t *handle, struct inode *inode1,
2748 struct inode *inode2, ext4_lblk_t lblk1,
2749 ext4_lblk_t lblk2, ext4_lblk_t count,
2750 int mark_unwritten,int *err);
2753 extern void ext4_double_down_write_data_sem(struct inode *first,
2754 struct inode *second);
2755 extern void ext4_double_up_write_data_sem(struct inode *orig_inode,
2756 struct inode *donor_inode);
2757 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
2758 __u64 start_orig, __u64 start_donor,
2759 __u64 len, __u64 *moved_len);
2762 extern int __init ext4_init_pageio(void);
2763 extern void ext4_exit_pageio(void);
2764 extern ext4_io_end_t *ext4_init_io_end(struct inode *inode, gfp_t flags);
2765 extern ext4_io_end_t *ext4_get_io_end(ext4_io_end_t *io_end);
2766 extern int ext4_put_io_end(ext4_io_end_t *io_end);
2767 extern void ext4_put_io_end_defer(ext4_io_end_t *io_end);
2768 extern void ext4_io_submit_init(struct ext4_io_submit *io,
2769 struct writeback_control *wbc);
2770 extern void ext4_end_io_rsv_work(struct work_struct *work);
2771 extern void ext4_io_submit(struct ext4_io_submit *io);
2772 extern int ext4_bio_write_page(struct ext4_io_submit *io,
2775 struct writeback_control *wbc,
2779 extern int ext4_multi_mount_protect(struct super_block *, ext4_fsblk_t);
2782 * Add new method to test whether block and inode bitmaps are properly
2783 * initialized. With uninit_bg reading the block from disk is not enough
2784 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2786 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2788 static inline int bitmap_uptodate(struct buffer_head *bh)
2790 return (buffer_uptodate(bh) &&
2791 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
2793 static inline void set_bitmap_uptodate(struct buffer_head *bh)
2795 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
2799 * Disable DIO read nolock optimization, so new dioreaders will be forced
2802 static inline void ext4_inode_block_unlocked_dio(struct inode *inode)
2804 ext4_set_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2807 static inline void ext4_inode_resume_unlocked_dio(struct inode *inode)
2810 ext4_clear_inode_state(inode, EXT4_STATE_DIOREAD_LOCK);
2813 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2815 /* For ioend & aio unwritten conversion wait queues */
2816 #define EXT4_WQ_HASH_SZ 37
2817 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2819 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2821 extern wait_queue_head_t ext4__ioend_wq[EXT4_WQ_HASH_SZ];
2822 extern struct mutex ext4__aio_mutex[EXT4_WQ_HASH_SZ];
2824 #define EXT4_RESIZING 0
2825 extern int ext4_resize_begin(struct super_block *sb);
2826 extern void ext4_resize_end(struct super_block *sb);
2828 #endif /* __KERNEL__ */
2830 #endif /* _EXT4_H */