4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/include/linux/minix_fs.h
13 * Copyright (C) 1991, 1992 Linus Torvalds
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
22 #include <linux/jbd2.h>
23 #include <linux/quota.h>
24 #include <linux/rwsem.h>
25 #include <linux/rbtree.h>
26 #include <linux/seqlock.h>
27 #include <linux/mutex.h>
28 #include <linux/timer.h>
29 #include <linux/wait.h>
30 #include <linux/blockgroup_lock.h>
31 #include <linux/percpu_counter.h>
32 #include <crypto/hash.h>
34 #include <linux/compat.h>
38 * The fourth extended filesystem constants/structures
42 * Define EXT4FS_DEBUG to produce debug messages
50 #define ext4_debug(f, a...) \
52 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
53 __FILE__, __LINE__, __func__); \
54 printk(KERN_DEBUG f, ## a); \
57 #define ext4_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
61 * Turn on EXT_DEBUG to get lots of info about extents operations.
65 #define ext_debug(fmt, ...) printk(fmt, ##__VA_ARGS__)
67 #define ext_debug(fmt, ...) no_printk(fmt, ##__VA_ARGS__)
70 #define EXT4_ERROR_INODE(inode, fmt, a...) \
71 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
73 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
74 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
76 #define EXT4_ERROR_FILE(file, block, fmt, a...) \
77 ext4_error_file((file), __func__, __LINE__, (block), (fmt), ## a)
79 /* data type for block offset of block group */
80 typedef int ext4_grpblk_t
;
82 /* data type for filesystem-wide blocks number */
83 typedef unsigned long long ext4_fsblk_t
;
85 /* data type for file logical block number */
86 typedef __u32 ext4_lblk_t
;
88 /* data type for block group number */
89 typedef unsigned int ext4_group_t
;
92 * Flags used in mballoc's allocation_context flags field.
94 * Also used to show what's going on for debugging purposes when the
95 * flag field is exported via the traceport interface
98 /* prefer goal again. length */
99 #define EXT4_MB_HINT_MERGE 0x0001
100 /* blocks already reserved */
101 #define EXT4_MB_HINT_RESERVED 0x0002
102 /* metadata is being allocated */
103 #define EXT4_MB_HINT_METADATA 0x0004
104 /* first blocks in the file */
105 #define EXT4_MB_HINT_FIRST 0x0008
106 /* search for the best chunk */
107 #define EXT4_MB_HINT_BEST 0x0010
108 /* data is being allocated */
109 #define EXT4_MB_HINT_DATA 0x0020
110 /* don't preallocate (for tails) */
111 #define EXT4_MB_HINT_NOPREALLOC 0x0040
112 /* allocate for locality group */
113 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
114 /* allocate goal blocks or none */
115 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
116 /* goal is meaningful */
117 #define EXT4_MB_HINT_TRY_GOAL 0x0200
118 /* blocks already pre-reserved by delayed allocation */
119 #define EXT4_MB_DELALLOC_RESERVED 0x0400
120 /* We are doing stream allocation */
121 #define EXT4_MB_STREAM_ALLOC 0x0800
122 /* Use reserved root blocks if needed */
123 #define EXT4_MB_USE_ROOT_BLOCKS 0x1000
125 struct ext4_allocation_request
{
126 /* target inode for block we're allocating */
128 /* how many blocks we want to allocate */
130 /* logical block in target inode */
132 /* the closest logical allocated block to the left */
134 /* the closest logical allocated block to the right */
136 /* phys. target (a hint) */
138 /* phys. block for the closest logical allocated block to the left */
140 /* phys. block for the closest logical allocated block to the right */
142 /* flags. see above EXT4_MB_HINT_* */
147 * Logical to physical block mapping, used by ext4_map_blocks()
149 * This structure is used to pass requests into ext4_map_blocks() as
150 * well as to store the information returned by ext4_map_blocks(). It
151 * takes less room on the stack than a struct buffer_head.
153 #define EXT4_MAP_NEW (1 << BH_New)
154 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
155 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
156 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
157 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
158 /* Sometimes (in the bigalloc case, from ext4_da_get_block_prep) the caller of
159 * ext4_map_blocks wants to know whether or not the underlying cluster has
160 * already been accounted for. EXT4_MAP_FROM_CLUSTER conveys to the caller that
161 * the requested mapping was from previously mapped (or delayed allocated)
162 * cluster. We use BH_AllocFromCluster only for this flag. BH_AllocFromCluster
163 * should never appear on buffer_head's state flags.
165 #define EXT4_MAP_FROM_CLUSTER (1 << BH_AllocFromCluster)
166 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
167 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
168 EXT4_MAP_UNINIT | EXT4_MAP_FROM_CLUSTER)
170 struct ext4_map_blocks
{
174 unsigned int m_flags
;
178 * For delayed allocation tracking
180 struct mpage_da_data
{
182 sector_t b_blocknr
; /* start block number of extent */
183 size_t b_size
; /* size of extent */
184 unsigned long b_state
; /* state of the extent */
185 unsigned long first_page
, next_page
; /* extent of pages */
186 struct writeback_control
*wbc
;
193 * Flags for ext4_io_end->flags
195 #define EXT4_IO_END_UNWRITTEN 0x0001
196 #define EXT4_IO_END_ERROR 0x0002
197 #define EXT4_IO_END_DIRECT 0x0004
199 struct ext4_io_page
{
204 #define MAX_IO_PAGES 128
207 * For converting uninitialized extents on a work queue.
209 * 'page' is only used from the writepage() path; 'pages' is only used for
210 * buffered writes; they are used to keep page references until conversion
211 * takes place. For AIO/DIO, neither field is filled in.
213 typedef struct ext4_io_end
{
214 struct list_head list
; /* per-file finished IO list */
215 struct inode
*inode
; /* file being written to */
216 unsigned int flag
; /* unwritten or not */
217 loff_t offset
; /* offset in the file */
218 ssize_t size
; /* size of the extent */
219 struct kiocb
*iocb
; /* iocb struct for AIO */
220 int result
; /* error value for AIO */
221 int num_io_pages
; /* for writepages() */
222 struct ext4_io_page
*pages
[MAX_IO_PAGES
]; /* for writepages() */
225 struct ext4_io_submit
{
228 ext4_io_end_t
*io_end
;
229 struct ext4_io_page
*io_page
;
230 sector_t io_next_block
;
234 * Special inodes numbers
236 #define EXT4_BAD_INO 1 /* Bad blocks inode */
237 #define EXT4_ROOT_INO 2 /* Root inode */
238 #define EXT4_USR_QUOTA_INO 3 /* User quota inode */
239 #define EXT4_GRP_QUOTA_INO 4 /* Group quota inode */
240 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
241 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
242 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
243 #define EXT4_JOURNAL_INO 8 /* Journal inode */
245 /* First non-reserved inode for old ext4 filesystems */
246 #define EXT4_GOOD_OLD_FIRST_INO 11
249 * Maximal count of links to a file
251 #define EXT4_LINK_MAX 65000
254 * Macro-instructions used to manage several block sizes
256 #define EXT4_MIN_BLOCK_SIZE 1024
257 #define EXT4_MAX_BLOCK_SIZE 65536
258 #define EXT4_MIN_BLOCK_LOG_SIZE 10
259 #define EXT4_MAX_BLOCK_LOG_SIZE 16
261 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
263 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
265 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
266 #define EXT4_CLUSTER_SIZE(s) (EXT4_BLOCK_SIZE(s) << \
267 EXT4_SB(s)->s_cluster_bits)
269 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
270 # define EXT4_CLUSTER_BITS(s) (EXT4_SB(s)->s_cluster_bits)
272 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
275 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
276 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
277 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
279 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
280 EXT4_GOOD_OLD_INODE_SIZE : \
282 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
283 EXT4_GOOD_OLD_FIRST_INO : \
286 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
288 /* Translate a block number to a cluster number */
289 #define EXT4_B2C(sbi, blk) ((blk) >> (sbi)->s_cluster_bits)
290 /* Translate a cluster number to a block number */
291 #define EXT4_C2B(sbi, cluster) ((cluster) << (sbi)->s_cluster_bits)
292 /* Translate # of blks to # of clusters */
293 #define EXT4_NUM_B2C(sbi, blks) (((blks) + (sbi)->s_cluster_ratio - 1) >> \
294 (sbi)->s_cluster_bits)
297 * Structure of a blocks group descriptor
299 struct ext4_group_desc
301 __le32 bg_block_bitmap_lo
; /* Blocks bitmap block */
302 __le32 bg_inode_bitmap_lo
; /* Inodes bitmap block */
303 __le32 bg_inode_table_lo
; /* Inodes table block */
304 __le16 bg_free_blocks_count_lo
;/* Free blocks count */
305 __le16 bg_free_inodes_count_lo
;/* Free inodes count */
306 __le16 bg_used_dirs_count_lo
; /* Directories count */
307 __le16 bg_flags
; /* EXT4_BG_flags (INODE_UNINIT, etc) */
308 __le32 bg_exclude_bitmap_lo
; /* Exclude bitmap for snapshots */
309 __le16 bg_block_bitmap_csum_lo
;/* crc32c(s_uuid+grp_num+bbitmap) LE */
310 __le16 bg_inode_bitmap_csum_lo
;/* crc32c(s_uuid+grp_num+ibitmap) LE */
311 __le16 bg_itable_unused_lo
; /* Unused inodes count */
312 __le16 bg_checksum
; /* crc16(sb_uuid+group+desc) */
313 __le32 bg_block_bitmap_hi
; /* Blocks bitmap block MSB */
314 __le32 bg_inode_bitmap_hi
; /* Inodes bitmap block MSB */
315 __le32 bg_inode_table_hi
; /* Inodes table block MSB */
316 __le16 bg_free_blocks_count_hi
;/* Free blocks count MSB */
317 __le16 bg_free_inodes_count_hi
;/* Free inodes count MSB */
318 __le16 bg_used_dirs_count_hi
; /* Directories count MSB */
319 __le16 bg_itable_unused_hi
; /* Unused inodes count MSB */
320 __le32 bg_exclude_bitmap_hi
; /* Exclude bitmap block MSB */
321 __le16 bg_block_bitmap_csum_hi
;/* crc32c(s_uuid+grp_num+bbitmap) BE */
322 __le16 bg_inode_bitmap_csum_hi
;/* crc32c(s_uuid+grp_num+ibitmap) BE */
326 #define EXT4_BG_INODE_BITMAP_CSUM_HI_END \
327 (offsetof(struct ext4_group_desc, bg_inode_bitmap_csum_hi) + \
329 #define EXT4_BG_BLOCK_BITMAP_CSUM_HI_END \
330 (offsetof(struct ext4_group_desc, bg_block_bitmap_csum_hi) + \
334 * Structure of a flex block group info
338 atomic_t free_inodes
;
339 atomic_t free_clusters
;
343 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
344 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
345 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
348 * Macro-instructions used to manage group descriptors
350 #define EXT4_MIN_DESC_SIZE 32
351 #define EXT4_MIN_DESC_SIZE_64BIT 64
352 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
353 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
355 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
356 # define EXT4_CLUSTERS_PER_GROUP(s) (EXT4_SB(s)->s_clusters_per_group)
357 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
358 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
359 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
361 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
362 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
363 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
367 * Constants relative to the data blocks
369 #define EXT4_NDIR_BLOCKS 12
370 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
371 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
372 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
373 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
378 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
379 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
380 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
381 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
382 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
383 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
384 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
385 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
386 /* Reserved for compression usage... */
387 #define EXT4_DIRTY_FL 0x00000100
388 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
389 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
390 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
391 /* End compression flags --- maybe not all used */
392 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
393 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
394 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
395 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
396 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
397 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
398 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
399 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
400 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
401 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
402 #define EXT4_INLINE_DATA_FL 0x10000000 /* Inode has inline data. */
403 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
405 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
406 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
408 /* Flags that should be inherited by new inodes from their parent. */
409 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
410 EXT4_SYNC_FL | EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
411 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
412 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
414 /* Flags that are appropriate for regular files (all but dir-specific ones). */
415 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
417 /* Flags that are appropriate for non-directories/regular files. */
418 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
420 /* Mask out flags that are inappropriate for the given type of inode. */
421 static inline __u32
ext4_mask_flags(umode_t mode
, __u32 flags
)
425 else if (S_ISREG(mode
))
426 return flags
& EXT4_REG_FLMASK
;
428 return flags
& EXT4_OTHER_FLMASK
;
432 * Inode flags used for atomic set/get
435 EXT4_INODE_SECRM
= 0, /* Secure deletion */
436 EXT4_INODE_UNRM
= 1, /* Undelete */
437 EXT4_INODE_COMPR
= 2, /* Compress file */
438 EXT4_INODE_SYNC
= 3, /* Synchronous updates */
439 EXT4_INODE_IMMUTABLE
= 4, /* Immutable file */
440 EXT4_INODE_APPEND
= 5, /* writes to file may only append */
441 EXT4_INODE_NODUMP
= 6, /* do not dump file */
442 EXT4_INODE_NOATIME
= 7, /* do not update atime */
443 /* Reserved for compression usage... */
444 EXT4_INODE_DIRTY
= 8,
445 EXT4_INODE_COMPRBLK
= 9, /* One or more compressed clusters */
446 EXT4_INODE_NOCOMPR
= 10, /* Don't compress */
447 EXT4_INODE_ECOMPR
= 11, /* Compression error */
448 /* End compression flags --- maybe not all used */
449 EXT4_INODE_INDEX
= 12, /* hash-indexed directory */
450 EXT4_INODE_IMAGIC
= 13, /* AFS directory */
451 EXT4_INODE_JOURNAL_DATA
= 14, /* file data should be journaled */
452 EXT4_INODE_NOTAIL
= 15, /* file tail should not be merged */
453 EXT4_INODE_DIRSYNC
= 16, /* dirsync behaviour (directories only) */
454 EXT4_INODE_TOPDIR
= 17, /* Top of directory hierarchies*/
455 EXT4_INODE_HUGE_FILE
= 18, /* Set to each huge file */
456 EXT4_INODE_EXTENTS
= 19, /* Inode uses extents */
457 EXT4_INODE_EA_INODE
= 21, /* Inode used for large EA */
458 EXT4_INODE_EOFBLOCKS
= 22, /* Blocks allocated beyond EOF */
459 EXT4_INODE_INLINE_DATA
= 28, /* Data in inode. */
460 EXT4_INODE_RESERVED
= 31, /* reserved for ext4 lib */
464 * Since it's pretty easy to mix up bit numbers and hex values, we use a
465 * build-time check to make sure that EXT4_XXX_FL is consistent with respect to
466 * EXT4_INODE_XXX. If all is well, the macros will be dropped, so, it won't cost
467 * any extra space in the compiled kernel image, otherwise, the build will fail.
468 * It's important that these values are the same, since we are using
469 * EXT4_INODE_XXX to test for flag values, but EXT4_XXX_FL must be consistent
470 * with the values of FS_XXX_FL defined in include/linux/fs.h and the on-disk
471 * values found in ext2, ext3 and ext4 filesystems, and of course the values
472 * defined in e2fsprogs.
474 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
476 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
477 #define CHECK_FLAG_VALUE(FLAG) BUILD_BUG_ON(!TEST_FLAG_VALUE(FLAG))
479 static inline void ext4_check_flag_values(void)
481 CHECK_FLAG_VALUE(SECRM
);
482 CHECK_FLAG_VALUE(UNRM
);
483 CHECK_FLAG_VALUE(COMPR
);
484 CHECK_FLAG_VALUE(SYNC
);
485 CHECK_FLAG_VALUE(IMMUTABLE
);
486 CHECK_FLAG_VALUE(APPEND
);
487 CHECK_FLAG_VALUE(NODUMP
);
488 CHECK_FLAG_VALUE(NOATIME
);
489 CHECK_FLAG_VALUE(DIRTY
);
490 CHECK_FLAG_VALUE(COMPRBLK
);
491 CHECK_FLAG_VALUE(NOCOMPR
);
492 CHECK_FLAG_VALUE(ECOMPR
);
493 CHECK_FLAG_VALUE(INDEX
);
494 CHECK_FLAG_VALUE(IMAGIC
);
495 CHECK_FLAG_VALUE(JOURNAL_DATA
);
496 CHECK_FLAG_VALUE(NOTAIL
);
497 CHECK_FLAG_VALUE(DIRSYNC
);
498 CHECK_FLAG_VALUE(TOPDIR
);
499 CHECK_FLAG_VALUE(HUGE_FILE
);
500 CHECK_FLAG_VALUE(EXTENTS
);
501 CHECK_FLAG_VALUE(EA_INODE
);
502 CHECK_FLAG_VALUE(EOFBLOCKS
);
503 CHECK_FLAG_VALUE(INLINE_DATA
);
504 CHECK_FLAG_VALUE(RESERVED
);
507 /* Used to pass group descriptor data when online resize is done */
508 struct ext4_new_group_input
{
509 __u32 group
; /* Group number for this data */
510 __u64 block_bitmap
; /* Absolute block number of block bitmap */
511 __u64 inode_bitmap
; /* Absolute block number of inode bitmap */
512 __u64 inode_table
; /* Absolute block number of inode table start */
513 __u32 blocks_count
; /* Total number of blocks in this group */
514 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
518 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
519 struct compat_ext4_new_group_input
{
521 compat_u64 block_bitmap
;
522 compat_u64 inode_bitmap
;
523 compat_u64 inode_table
;
530 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
531 struct ext4_new_group_data
{
537 __u16 reserved_blocks
;
539 __u32 free_blocks_count
;
542 /* Indexes used to index group tables in ext4_new_group_data */
544 BLOCK_BITMAP
= 0, /* block bitmap */
545 INODE_BITMAP
, /* inode bitmap */
546 INODE_TABLE
, /* inode tables */
551 * Flags used by ext4_map_blocks()
553 /* Allocate any needed blocks and/or convert an unitialized
554 extent to be an initialized ext4 */
555 #define EXT4_GET_BLOCKS_CREATE 0x0001
556 /* Request the creation of an unitialized extent */
557 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
558 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
559 EXT4_GET_BLOCKS_CREATE)
560 /* Caller is from the delayed allocation writeout path,
561 so set the magic i_delalloc_reserve_flag after taking the
562 inode allocation semaphore for */
563 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
564 /* caller is from the direct IO path, request to creation of an
565 unitialized extents if not allocated, split the uninitialized
566 extent if blocks has been preallocated already*/
567 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
568 #define EXT4_GET_BLOCKS_CONVERT 0x0010
569 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
570 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
571 /* Convert extent to initialized after IO complete */
572 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
573 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
574 /* Punch out blocks of an extent */
575 #define EXT4_GET_BLOCKS_PUNCH_OUT_EXT 0x0020
576 /* Don't normalize allocation size (used for fallocate) */
577 #define EXT4_GET_BLOCKS_NO_NORMALIZE 0x0040
578 /* Request will not result in inode size update (user for fallocate) */
579 #define EXT4_GET_BLOCKS_KEEP_SIZE 0x0080
580 /* Do not take i_data_sem locking in ext4_map_blocks */
581 #define EXT4_GET_BLOCKS_NO_LOCK 0x0100
584 * Flags used by ext4_free_blocks
586 #define EXT4_FREE_BLOCKS_METADATA 0x0001
587 #define EXT4_FREE_BLOCKS_FORGET 0x0002
588 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
589 #define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
590 #define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
591 #define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
594 * Flags used by ext4_discard_partial_page_buffers
596 #define EXT4_DISCARD_PARTIAL_PG_ZERO_UNMAPPED 0x0001
601 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
602 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
603 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
604 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
605 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
606 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
607 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
608 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
609 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
610 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
611 #define EXT4_IOC_MIGRATE _IO('f', 9)
612 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
613 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
614 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
615 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
616 #define EXT4_IOC_RESIZE_FS _IOW('f', 16, __u64)
618 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
620 * ioctl commands in 32 bit emulation
622 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
623 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
624 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
625 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
626 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
627 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
628 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
629 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
630 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
631 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
634 /* Max physical block we can address w/o extents */
635 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
638 * Structure of an inode on the disk
641 __le16 i_mode
; /* File mode */
642 __le16 i_uid
; /* Low 16 bits of Owner Uid */
643 __le32 i_size_lo
; /* Size in bytes */
644 __le32 i_atime
; /* Access time */
645 __le32 i_ctime
; /* Inode Change time */
646 __le32 i_mtime
; /* Modification time */
647 __le32 i_dtime
; /* Deletion Time */
648 __le16 i_gid
; /* Low 16 bits of Group Id */
649 __le16 i_links_count
; /* Links count */
650 __le32 i_blocks_lo
; /* Blocks count */
651 __le32 i_flags
; /* File flags */
657 __u32 h_i_translator
;
662 } osd1
; /* OS dependent 1 */
663 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
664 __le32 i_generation
; /* File version (for NFS) */
665 __le32 i_file_acl_lo
; /* File ACL */
667 __le32 i_obso_faddr
; /* Obsoleted fragment address */
670 __le16 l_i_blocks_high
; /* were l_i_reserved1 */
671 __le16 l_i_file_acl_high
;
672 __le16 l_i_uid_high
; /* these 2 fields */
673 __le16 l_i_gid_high
; /* were reserved2[0] */
674 __le16 l_i_checksum_lo
;/* crc32c(uuid+inum+inode) LE */
678 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
685 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
686 __le16 m_i_file_acl_high
;
687 __u32 m_i_reserved2
[2];
689 } osd2
; /* OS dependent 2 */
690 __le16 i_extra_isize
;
691 __le16 i_checksum_hi
; /* crc32c(uuid+inum+inode) BE */
692 __le32 i_ctime_extra
; /* extra Change time (nsec << 2 | epoch) */
693 __le32 i_mtime_extra
; /* extra Modification time(nsec << 2 | epoch) */
694 __le32 i_atime_extra
; /* extra Access time (nsec << 2 | epoch) */
695 __le32 i_crtime
; /* File Creation time */
696 __le32 i_crtime_extra
; /* extra FileCreationtime (nsec << 2 | epoch) */
697 __le32 i_version_hi
; /* high 32 bits for 64-bit version */
701 __u32 reserved
; /* should be zero */
702 __u32 donor_fd
; /* donor file descriptor */
703 __u64 orig_start
; /* logical start offset in block for orig */
704 __u64 donor_start
; /* logical start offset in block for donor */
705 __u64 len
; /* block length to be moved */
706 __u64 moved_len
; /* moved block length */
709 #define EXT4_EPOCH_BITS 2
710 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
711 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
714 * Extended fields will fit into an inode if the filesystem was formatted
715 * with large inodes (-I 256 or larger) and there are not currently any EAs
716 * consuming all of the available space. For new inodes we always reserve
717 * enough space for the kernel's known extended fields, but for inodes
718 * created with an old kernel this might not have been the case. None of
719 * the extended inode fields is critical for correct filesystem operation.
720 * This macro checks if a certain field fits in the inode. Note that
721 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
723 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
724 ((offsetof(typeof(*ext4_inode), field) + \
725 sizeof((ext4_inode)->field)) \
726 <= (EXT4_GOOD_OLD_INODE_SIZE + \
727 (einode)->i_extra_isize)) \
729 static inline __le32 ext4_encode_extra_time(struct timespec *time)
731 return cpu_to_le32((sizeof(time
->tv_sec
) > 4 ?
732 (time
->tv_sec
>> 32) & EXT4_EPOCH_MASK
: 0) |
733 ((time
->tv_nsec
<< EXT4_EPOCH_BITS
) & EXT4_NSEC_MASK
));
736 static inline void ext4_decode_extra_time(struct timespec
*time
, __le32 extra
)
738 if (sizeof(time
->tv_sec
) > 4)
739 time
->tv_sec
|= (__u64
)(le32_to_cpu(extra
) & EXT4_EPOCH_MASK
)
741 time
->tv_nsec
= (le32_to_cpu(extra
) & EXT4_NSEC_MASK
) >> EXT4_EPOCH_BITS
;
744 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
746 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
747 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
748 (raw_inode)->xtime ## _extra = \
749 ext4_encode_extra_time(&(inode)->xtime); \
752 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
754 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
755 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
756 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
757 (raw_inode)->xtime ## _extra = \
758 ext4_encode_extra_time(&(einode)->xtime); \
761 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
763 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
764 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
765 ext4_decode_extra_time(&(inode)->xtime, \
766 raw_inode->xtime ## _extra); \
768 (inode)->xtime.tv_nsec = 0; \
771 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
773 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
774 (einode)->xtime.tv_sec = \
775 (signed)le32_to_cpu((raw_inode)->xtime); \
776 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
777 ext4_decode_extra_time(&(einode)->xtime, \
778 raw_inode->xtime ## _extra); \
780 (einode)->xtime.tv_nsec = 0; \
783 #define i_disk_version osd1.linux1.l_i_version
785 #if defined(__KERNEL__) || defined(__linux__)
786 #define i_reserved1 osd1.linux1.l_i_reserved1
787 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
788 #define i_blocks_high osd2.linux2.l_i_blocks_high
789 #define i_uid_low i_uid
790 #define i_gid_low i_gid
791 #define i_uid_high osd2.linux2.l_i_uid_high
792 #define i_gid_high osd2.linux2.l_i_gid_high
793 #define i_checksum_lo osd2.linux2.l_i_checksum_lo
795 #elif defined(__GNU__)
797 #define i_translator osd1.hurd1.h_i_translator
798 #define i_uid_high osd2.hurd2.h_i_uid_high
799 #define i_gid_high osd2.hurd2.h_i_gid_high
800 #define i_author osd2.hurd2.h_i_author
802 #elif defined(__masix__)
804 #define i_reserved1 osd1.masix1.m_i_reserved1
805 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
806 #define i_reserved2 osd2.masix2.m_i_reserved2
808 #endif /* defined(__KERNEL__) || defined(__linux__) */
811 * storage for cached extent
812 * If ec_len == 0, then the cache is invalid.
813 * If ec_start == 0, then the cache represents a gap (null mapping)
815 struct ext4_ext_cache
{
816 ext4_fsblk_t ec_start
;
817 ext4_lblk_t ec_block
;
818 __u32 ec_len
; /* must be 32bit to return holes */
821 #include "extents_status.h"
824 * fourth extended file system inode data in memory
826 struct ext4_inode_info
{
827 __le32 i_data
[15]; /* unconverted */
829 ext4_fsblk_t i_file_acl
;
832 * i_block_group is the number of the block group which contains
833 * this file's inode. Constant across the lifetime of the inode,
834 * it is ued for making block allocation decisions - we try to
835 * place a file's data blocks near its inode block, and new inodes
836 * near to their parent directory's inode.
838 ext4_group_t i_block_group
;
839 ext4_lblk_t i_dir_start_lookup
;
840 #if (BITS_PER_LONG < 64)
841 unsigned long i_state_flags
; /* Dynamic state flags */
843 unsigned long i_flags
;
846 * Extended attributes can be read independently of the main file
847 * data. Taking i_mutex even when reading would cause contention
848 * between readers of EAs and writers of regular file data, so
849 * instead we synchronize on xattr_sem when reading or changing
852 struct rw_semaphore xattr_sem
;
854 struct list_head i_orphan
; /* unlinked but open inodes */
857 * i_disksize keeps track of what the inode size is ON DISK, not
858 * in memory. During truncate, i_size is set to the new size by
859 * the VFS prior to calling ext4_truncate(), but the filesystem won't
860 * set i_disksize to 0 until the truncate is actually under way.
862 * The intent is that i_disksize always represents the blocks which
863 * are used by this file. This allows recovery to restart truncate
864 * on orphans if we crash during truncate. We actually write i_disksize
865 * into the on-disk inode when writing inodes out, instead of i_size.
867 * The only time when i_disksize and i_size may be different is when
868 * a truncate is in progress. The only things which change i_disksize
869 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
874 * i_data_sem is for serialising ext4_truncate() against
875 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
876 * data tree are chopped off during truncate. We can't do that in
877 * ext4 because whenever we perform intermediate commits during
878 * truncate, the inode and all the metadata blocks *must* be in a
879 * consistent state which allows truncation of the orphans to restart
880 * during recovery. Hence we must fix the get_block-vs-truncate race
881 * by other means, so we have i_data_sem.
883 struct rw_semaphore i_data_sem
;
884 struct inode vfs_inode
;
885 struct jbd2_inode
*jinode
;
887 struct ext4_ext_cache i_cached_extent
;
889 * File creation time. Its function is same as that of
890 * struct timespec i_{a,c,m}time in the generic inode.
892 struct timespec i_crtime
;
895 struct list_head i_prealloc_list
;
896 spinlock_t i_prealloc_lock
;
898 /* extents status tree */
899 struct ext4_es_tree i_es_tree
;
903 ext4_group_t i_last_alloc_group
;
905 /* allocation reservation info for delalloc */
906 /* In case of bigalloc, these refer to clusters rather than blocks */
907 unsigned int i_reserved_data_blocks
;
908 unsigned int i_reserved_meta_blocks
;
909 unsigned int i_allocated_meta_blocks
;
910 ext4_lblk_t i_da_metadata_calc_last_lblock
;
911 int i_da_metadata_calc_len
;
913 /* on-disk additional length */
916 /* Indicate the inline data space. */
921 /* quota space reservation, managed internally by quota code */
922 qsize_t i_reserved_quota
;
925 /* completed IOs that might need unwritten extents handling */
926 struct list_head i_completed_io_list
;
927 spinlock_t i_completed_io_lock
;
928 atomic_t i_ioend_count
; /* Number of outstanding io_end structs */
929 atomic_t i_unwritten
; /* Nr. of inflight conversions pending */
930 struct work_struct i_unwritten_work
; /* deferred extent conversion */
932 spinlock_t i_block_reservation_lock
;
935 * Transactions that contain inode's metadata needed to complete
936 * fsync and fdatasync, respectively.
939 tid_t i_datasync_tid
;
941 /* Precomputed uuid+inum+igen checksum for seeding inode checksums */
948 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
949 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
950 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
953 * Misc. filesystem flags
955 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
956 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
957 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
962 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
963 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
964 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
965 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
966 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
967 #define EXT4_MOUNT_ERRORS_MASK 0x00070
968 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
969 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
970 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
971 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
972 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
973 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
974 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
975 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
976 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
977 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
978 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
979 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
980 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
981 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
982 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
983 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
984 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
985 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
986 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
987 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
988 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
989 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
990 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
992 #define EXT4_MOUNT2_EXPLICIT_DELALLOC 0x00000001 /* User explicitly
993 specified delalloc */
995 #define clear_opt(sb, opt) EXT4_SB(sb)->s_mount_opt &= \
997 #define set_opt(sb, opt) EXT4_SB(sb)->s_mount_opt |= \
999 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
1002 #define clear_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 &= \
1004 #define set_opt2(sb, opt) EXT4_SB(sb)->s_mount_opt2 |= \
1006 #define test_opt2(sb, opt) (EXT4_SB(sb)->s_mount_opt2 & \
1009 #define ext4_test_and_set_bit __test_and_set_bit_le
1010 #define ext4_set_bit __set_bit_le
1011 #define ext4_set_bit_atomic ext2_set_bit_atomic
1012 #define ext4_test_and_clear_bit __test_and_clear_bit_le
1013 #define ext4_clear_bit __clear_bit_le
1014 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
1015 #define ext4_test_bit test_bit_le
1016 #define ext4_find_next_zero_bit find_next_zero_bit_le
1017 #define ext4_find_next_bit find_next_bit_le
1019 extern void ext4_set_bits(void *bm
, int cur
, int len
);
1022 * Maximal mount counts between two filesystem checks
1024 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
1025 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
1028 * Behaviour when detecting errors
1030 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
1031 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
1032 #define EXT4_ERRORS_PANIC 3 /* Panic */
1033 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
1035 /* Metadata checksum algorithm codes */
1036 #define EXT4_CRC32C_CHKSUM 1
1039 * Structure of the super block
1041 struct ext4_super_block
{
1042 /*00*/ __le32 s_inodes_count
; /* Inodes count */
1043 __le32 s_blocks_count_lo
; /* Blocks count */
1044 __le32 s_r_blocks_count_lo
; /* Reserved blocks count */
1045 __le32 s_free_blocks_count_lo
; /* Free blocks count */
1046 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
1047 __le32 s_first_data_block
; /* First Data Block */
1048 __le32 s_log_block_size
; /* Block size */
1049 __le32 s_log_cluster_size
; /* Allocation cluster size */
1050 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
1051 __le32 s_clusters_per_group
; /* # Clusters per group */
1052 __le32 s_inodes_per_group
; /* # Inodes per group */
1053 __le32 s_mtime
; /* Mount time */
1054 /*30*/ __le32 s_wtime
; /* Write time */
1055 __le16 s_mnt_count
; /* Mount count */
1056 __le16 s_max_mnt_count
; /* Maximal mount count */
1057 __le16 s_magic
; /* Magic signature */
1058 __le16 s_state
; /* File system state */
1059 __le16 s_errors
; /* Behaviour when detecting errors */
1060 __le16 s_minor_rev_level
; /* minor revision level */
1061 /*40*/ __le32 s_lastcheck
; /* time of last check */
1062 __le32 s_checkinterval
; /* max. time between checks */
1063 __le32 s_creator_os
; /* OS */
1064 __le32 s_rev_level
; /* Revision level */
1065 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
1066 __le16 s_def_resgid
; /* Default gid for reserved blocks */
1068 * These fields are for EXT4_DYNAMIC_REV superblocks only.
1070 * Note: the difference between the compatible feature set and
1071 * the incompatible feature set is that if there is a bit set
1072 * in the incompatible feature set that the kernel doesn't
1073 * know about, it should refuse to mount the filesystem.
1075 * e2fsck's requirements are more strict; if it doesn't know
1076 * about a feature in either the compatible or incompatible
1077 * feature set, it must abort and not try to meddle with
1078 * things it doesn't understand...
1080 __le32 s_first_ino
; /* First non-reserved inode */
1081 __le16 s_inode_size
; /* size of inode structure */
1082 __le16 s_block_group_nr
; /* block group # of this superblock */
1083 __le32 s_feature_compat
; /* compatible feature set */
1084 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
1085 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
1086 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
1087 /*78*/ char s_volume_name
[16]; /* volume name */
1088 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
1089 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
1091 * Performance hints. Directory preallocation should only
1092 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
1094 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
1095 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
1096 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
1098 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
1100 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
1101 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
1102 __le32 s_journal_dev
; /* device number of journal file */
1103 __le32 s_last_orphan
; /* start of list of inodes to delete */
1104 __le32 s_hash_seed
[4]; /* HTREE hash seed */
1105 __u8 s_def_hash_version
; /* Default hash version to use */
1106 __u8 s_jnl_backup_type
;
1107 __le16 s_desc_size
; /* size of group descriptor */
1108 /*100*/ __le32 s_default_mount_opts
;
1109 __le32 s_first_meta_bg
; /* First metablock block group */
1110 __le32 s_mkfs_time
; /* When the filesystem was created */
1111 __le32 s_jnl_blocks
[17]; /* Backup of the journal inode */
1112 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
1113 /*150*/ __le32 s_blocks_count_hi
; /* Blocks count */
1114 __le32 s_r_blocks_count_hi
; /* Reserved blocks count */
1115 __le32 s_free_blocks_count_hi
; /* Free blocks count */
1116 __le16 s_min_extra_isize
; /* All inodes have at least # bytes */
1117 __le16 s_want_extra_isize
; /* New inodes should reserve # bytes */
1118 __le32 s_flags
; /* Miscellaneous flags */
1119 __le16 s_raid_stride
; /* RAID stride */
1120 __le16 s_mmp_update_interval
; /* # seconds to wait in MMP checking */
1121 __le64 s_mmp_block
; /* Block for multi-mount protection */
1122 __le32 s_raid_stripe_width
; /* blocks on all data disks (N*stride)*/
1123 __u8 s_log_groups_per_flex
; /* FLEX_BG group size */
1124 __u8 s_checksum_type
; /* metadata checksum algorithm used */
1125 __le16 s_reserved_pad
;
1126 __le64 s_kbytes_written
; /* nr of lifetime kilobytes written */
1127 __le32 s_snapshot_inum
; /* Inode number of active snapshot */
1128 __le32 s_snapshot_id
; /* sequential ID of active snapshot */
1129 __le64 s_snapshot_r_blocks_count
; /* reserved blocks for active
1130 snapshot's future use */
1131 __le32 s_snapshot_list
; /* inode number of the head of the
1132 on-disk snapshot list */
1133 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1134 __le32 s_error_count
; /* number of fs errors */
1135 __le32 s_first_error_time
; /* first time an error happened */
1136 __le32 s_first_error_ino
; /* inode involved in first error */
1137 __le64 s_first_error_block
; /* block involved of first error */
1138 __u8 s_first_error_func
[32]; /* function where the error happened */
1139 __le32 s_first_error_line
; /* line number where error happened */
1140 __le32 s_last_error_time
; /* most recent time of an error */
1141 __le32 s_last_error_ino
; /* inode involved in last error */
1142 __le32 s_last_error_line
; /* line number where error happened */
1143 __le64 s_last_error_block
; /* block involved of last error */
1144 __u8 s_last_error_func
[32]; /* function where the error happened */
1145 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1146 __u8 s_mount_opts
[64];
1147 __le32 s_usr_quota_inum
; /* inode for tracking user quota */
1148 __le32 s_grp_quota_inum
; /* inode for tracking group quota */
1149 __le32 s_overhead_clusters
; /* overhead blocks/clusters in fs */
1150 __le32 s_reserved
[108]; /* Padding to the end of the block */
1151 __le32 s_checksum
; /* crc32c(superblock) */
1154 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1159 * run-time mount flags
1161 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1162 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1165 * fourth extended-fs super-block data in memory
1167 struct ext4_sb_info
{
1168 unsigned long s_desc_size
; /* Size of a group descriptor in bytes */
1169 unsigned long s_inodes_per_block
;/* Number of inodes per block */
1170 unsigned long s_blocks_per_group
;/* Number of blocks in a group */
1171 unsigned long s_clusters_per_group
; /* Number of clusters in a group */
1172 unsigned long s_inodes_per_group
;/* Number of inodes in a group */
1173 unsigned long s_itb_per_group
; /* Number of inode table blocks per group */
1174 unsigned long s_gdb_count
; /* Number of group descriptor blocks */
1175 unsigned long s_desc_per_block
; /* Number of group descriptors per block */
1176 ext4_group_t s_groups_count
; /* Number of groups in the fs */
1177 ext4_group_t s_blockfile_groups
;/* Groups acceptable for non-extent files */
1178 unsigned long s_overhead
; /* # of fs overhead clusters */
1179 unsigned int s_cluster_ratio
; /* Number of blocks per cluster */
1180 unsigned int s_cluster_bits
; /* log2 of s_cluster_ratio */
1181 loff_t s_bitmap_maxbytes
; /* max bytes for bitmap files */
1182 struct buffer_head
* s_sbh
; /* Buffer containing the super block */
1183 struct ext4_super_block
*s_es
; /* Pointer to the super block in the buffer */
1184 struct buffer_head
**s_group_desc
;
1185 unsigned int s_mount_opt
;
1186 unsigned int s_mount_opt2
;
1187 unsigned int s_mount_flags
;
1188 unsigned int s_def_mount_opt
;
1189 ext4_fsblk_t s_sb_block
;
1192 unsigned short s_mount_state
;
1193 unsigned short s_pad
;
1194 int s_addr_per_block_bits
;
1195 int s_desc_per_block_bits
;
1198 unsigned int s_inode_readahead_blks
;
1199 unsigned int s_inode_goal
;
1200 spinlock_t s_next_gen_lock
;
1201 u32 s_next_generation
;
1203 int s_def_hash_version
;
1204 int s_hash_unsigned
; /* 3 if hash should be signed, 0 if not */
1205 struct percpu_counter s_freeclusters_counter
;
1206 struct percpu_counter s_freeinodes_counter
;
1207 struct percpu_counter s_dirs_counter
;
1208 struct percpu_counter s_dirtyclusters_counter
;
1209 struct blockgroup_lock
*s_blockgroup_lock
;
1210 struct proc_dir_entry
*s_proc
;
1211 struct kobject s_kobj
;
1212 struct completion s_kobj_unregister
;
1213 struct super_block
*s_sb
;
1216 struct journal_s
*s_journal
;
1217 struct list_head s_orphan
;
1218 struct mutex s_orphan_lock
;
1219 unsigned long s_resize_flags
; /* Flags indicating if there
1221 unsigned long s_commit_interval
;
1222 u32 s_max_batch_time
;
1223 u32 s_min_batch_time
;
1224 struct block_device
*journal_bdev
;
1226 char *s_qf_names
[MAXQUOTAS
]; /* Names of quota files with journalled quota */
1227 int s_jquota_fmt
; /* Format of quota to use */
1229 unsigned int s_want_extra_isize
; /* New inodes should reserve # bytes */
1230 struct rb_root system_blks
;
1232 #ifdef EXTENTS_STATS
1233 /* ext4 extents stats */
1234 unsigned long s_ext_min
;
1235 unsigned long s_ext_max
;
1236 unsigned long s_depth_max
;
1237 spinlock_t s_ext_stats_lock
;
1238 unsigned long s_ext_blocks
;
1239 unsigned long s_ext_extents
;
1242 /* for buddy allocator */
1243 struct ext4_group_info
***s_group_info
;
1244 struct inode
*s_buddy_cache
;
1245 spinlock_t s_md_lock
;
1246 unsigned short *s_mb_offsets
;
1247 unsigned int *s_mb_maxs
;
1248 unsigned int s_group_info_size
;
1251 unsigned long s_stripe
;
1252 unsigned int s_mb_stream_request
;
1253 unsigned int s_mb_max_to_scan
;
1254 unsigned int s_mb_min_to_scan
;
1255 unsigned int s_mb_stats
;
1256 unsigned int s_mb_order2_reqs
;
1257 unsigned int s_mb_group_prealloc
;
1258 unsigned int s_max_writeback_mb_bump
;
1259 unsigned int s_max_dir_size_kb
;
1260 /* where last allocation was done - for stream allocation */
1261 unsigned long s_mb_last_group
;
1262 unsigned long s_mb_last_start
;
1264 /* stats for buddy allocator */
1265 atomic_t s_bal_reqs
; /* number of reqs with len > 1 */
1266 atomic_t s_bal_success
; /* we found long enough chunks */
1267 atomic_t s_bal_allocated
; /* in blocks */
1268 atomic_t s_bal_ex_scanned
; /* total extents scanned */
1269 atomic_t s_bal_goals
; /* goal hits */
1270 atomic_t s_bal_breaks
; /* too long searches */
1271 atomic_t s_bal_2orders
; /* 2^order hits */
1272 spinlock_t s_bal_lock
;
1273 unsigned long s_mb_buddies_generated
;
1274 unsigned long long s_mb_generation_time
;
1275 atomic_t s_mb_lost_chunks
;
1276 atomic_t s_mb_preallocated
;
1277 atomic_t s_mb_discarded
;
1278 atomic_t s_lock_busy
;
1280 /* locality groups */
1281 struct ext4_locality_group __percpu
*s_locality_groups
;
1283 /* for write statistics */
1284 unsigned long s_sectors_written_start
;
1285 u64 s_kbytes_written
;
1287 /* the size of zero-out chunk */
1288 unsigned int s_extent_max_zeroout_kb
;
1290 unsigned int s_log_groups_per_flex
;
1291 struct flex_groups
*s_flex_groups
;
1292 ext4_group_t s_flex_groups_allocated
;
1294 /* workqueue for dio unwritten */
1295 struct workqueue_struct
*dio_unwritten_wq
;
1297 /* timer for periodic error stats printing */
1298 struct timer_list s_err_report
;
1300 /* Lazy inode table initialization info */
1301 struct ext4_li_request
*s_li_request
;
1302 /* Wait multiplier for lazy initialization thread */
1303 unsigned int s_li_wait_mult
;
1305 /* Kernel thread for multiple mount protection */
1306 struct task_struct
*s_mmp_tsk
;
1308 /* record the last minlen when FITRIM is called. */
1309 atomic_t s_last_trim_minblks
;
1311 /* Reference to checksum algorithm driver via cryptoapi */
1312 struct crypto_shash
*s_chksum_driver
;
1314 /* Precomputed FS UUID checksum for seeding other checksums */
1318 static inline struct ext4_sb_info
*EXT4_SB(struct super_block
*sb
)
1320 return sb
->s_fs_info
;
1322 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
1324 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
1327 static inline struct timespec
ext4_current_time(struct inode
*inode
)
1329 return (inode
->i_sb
->s_time_gran
< NSEC_PER_SEC
) ?
1330 current_fs_time(inode
->i_sb
) : CURRENT_TIME_SEC
;
1333 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
1335 return ino
== EXT4_ROOT_INO
||
1336 ino
== EXT4_USR_QUOTA_INO
||
1337 ino
== EXT4_GRP_QUOTA_INO
||
1338 ino
== EXT4_JOURNAL_INO
||
1339 ino
== EXT4_RESIZE_INO
||
1340 (ino
>= EXT4_FIRST_INO(sb
) &&
1341 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
1344 static inline void ext4_set_io_unwritten_flag(struct inode
*inode
,
1345 struct ext4_io_end
*io_end
)
1347 if (!(io_end
->flag
& EXT4_IO_END_UNWRITTEN
)) {
1348 io_end
->flag
|= EXT4_IO_END_UNWRITTEN
;
1349 atomic_inc(&EXT4_I(inode
)->i_unwritten
);
1353 static inline ext4_io_end_t
*ext4_inode_aio(struct inode
*inode
)
1355 return inode
->i_private
;
1358 static inline void ext4_inode_aio_set(struct inode
*inode
, ext4_io_end_t
*io
)
1360 inode
->i_private
= io
;
1364 * Inode dynamic state flags
1367 EXT4_STATE_JDATA
, /* journaled data exists */
1368 EXT4_STATE_NEW
, /* inode is newly created */
1369 EXT4_STATE_XATTR
, /* has in-inode xattrs */
1370 EXT4_STATE_NO_EXPAND
, /* No space for expansion */
1371 EXT4_STATE_DA_ALLOC_CLOSE
, /* Alloc DA blks on close */
1372 EXT4_STATE_EXT_MIGRATE
, /* Inode is migrating */
1373 EXT4_STATE_DIO_UNWRITTEN
, /* need convert on dio done*/
1374 EXT4_STATE_NEWENTRY
, /* File just added to dir */
1375 EXT4_STATE_DELALLOC_RESERVED
, /* blks already reserved for delalloc */
1376 EXT4_STATE_DIOREAD_LOCK
, /* Disable support for dio read
1378 EXT4_STATE_MAY_INLINE_DATA
, /* may have in-inode data */
1381 #define EXT4_INODE_BIT_FNS(name, field, offset) \
1382 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1384 return test_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1386 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1388 set_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1390 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1392 clear_bit(bit + (offset), &EXT4_I(inode)->i_##field); \
1395 EXT4_INODE_BIT_FNS(flag
, flags
, 0)
1396 #if (BITS_PER_LONG < 64)
1397 EXT4_INODE_BIT_FNS(state
, state_flags
, 0)
1399 static inline void ext4_clear_state_flags(struct ext4_inode_info
*ei
)
1401 (ei
)->i_state_flags
= 0;
1404 EXT4_INODE_BIT_FNS(state
, flags
, 32)
1406 static inline void ext4_clear_state_flags(struct ext4_inode_info
*ei
)
1408 /* We depend on the fact that callers will set i_flags */
1412 /* Assume that user mode programs are passing in an ext4fs superblock, not
1413 * a kernel struct super_block. This will allow us to call the feature-test
1414 * macros from user land. */
1415 #define EXT4_SB(sb) (sb)
1418 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1421 * Codes for operating systems
1423 #define EXT4_OS_LINUX 0
1424 #define EXT4_OS_HURD 1
1425 #define EXT4_OS_MASIX 2
1426 #define EXT4_OS_FREEBSD 3
1427 #define EXT4_OS_LITES 4
1432 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1433 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1435 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1436 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1438 #define EXT4_GOOD_OLD_INODE_SIZE 128
1441 * Feature set definitions
1444 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1445 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1446 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1447 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1448 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1449 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1450 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1451 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1452 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1453 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1454 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1455 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1456 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1457 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1458 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1459 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1460 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1461 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1463 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1464 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1465 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1466 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1467 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1468 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1470 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1471 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1472 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1473 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1474 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1475 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1476 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1477 #define EXT4_FEATURE_RO_COMPAT_QUOTA 0x0100
1478 #define EXT4_FEATURE_RO_COMPAT_BIGALLOC 0x0200
1480 * METADATA_CSUM also enables group descriptor checksums (GDT_CSUM). When
1481 * METADATA_CSUM is set, group descriptor checksums use the same algorithm as
1482 * all other data structures' checksums. However, the METADATA_CSUM and
1483 * GDT_CSUM bits are mutually exclusive.
1485 #define EXT4_FEATURE_RO_COMPAT_METADATA_CSUM 0x0400
1487 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1488 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1489 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1490 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1491 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1492 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1493 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1494 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1495 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1496 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1497 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1498 #define EXT4_FEATURE_INCOMPAT_BG_USE_META_CSUM 0x2000 /* use crc32c for bg */
1499 #define EXT4_FEATURE_INCOMPAT_LARGEDIR 0x4000 /* >2GB or 3-lvl htree */
1500 #define EXT4_FEATURE_INCOMPAT_INLINE_DATA 0x8000 /* data in inode */
1502 #define EXT2_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1503 #define EXT2_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1504 EXT4_FEATURE_INCOMPAT_META_BG)
1505 #define EXT2_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1506 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1507 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1509 #define EXT3_FEATURE_COMPAT_SUPP EXT4_FEATURE_COMPAT_EXT_ATTR
1510 #define EXT3_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1511 EXT4_FEATURE_INCOMPAT_RECOVER| \
1512 EXT4_FEATURE_INCOMPAT_META_BG)
1513 #define EXT3_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1514 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1515 EXT4_FEATURE_RO_COMPAT_BTREE_DIR)
1517 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1518 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1519 EXT4_FEATURE_INCOMPAT_RECOVER| \
1520 EXT4_FEATURE_INCOMPAT_META_BG| \
1521 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1522 EXT4_FEATURE_INCOMPAT_64BIT| \
1523 EXT4_FEATURE_INCOMPAT_FLEX_BG| \
1524 EXT4_FEATURE_INCOMPAT_MMP | \
1525 EXT4_FEATURE_INCOMPAT_INLINE_DATA)
1526 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1527 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1528 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1529 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1530 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1531 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1532 EXT4_FEATURE_RO_COMPAT_HUGE_FILE |\
1533 EXT4_FEATURE_RO_COMPAT_BIGALLOC |\
1534 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM|\
1535 EXT4_FEATURE_RO_COMPAT_QUOTA)
1538 * Default values for user and/or group using reserved blocks
1540 #define EXT4_DEF_RESUID 0
1541 #define EXT4_DEF_RESGID 0
1543 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1546 * Default mount options
1548 #define EXT4_DEFM_DEBUG 0x0001
1549 #define EXT4_DEFM_BSDGROUPS 0x0002
1550 #define EXT4_DEFM_XATTR_USER 0x0004
1551 #define EXT4_DEFM_ACL 0x0008
1552 #define EXT4_DEFM_UID16 0x0010
1553 #define EXT4_DEFM_JMODE 0x0060
1554 #define EXT4_DEFM_JMODE_DATA 0x0020
1555 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1556 #define EXT4_DEFM_JMODE_WBACK 0x0060
1557 #define EXT4_DEFM_NOBARRIER 0x0100
1558 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1559 #define EXT4_DEFM_DISCARD 0x0400
1560 #define EXT4_DEFM_NODELALLOC 0x0800
1563 * Default journal batch times
1565 #define EXT4_DEF_MIN_BATCH_TIME 0
1566 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1569 * Minimum number of groups in a flexgroup before we separate out
1570 * directories into the first block group of a flexgroup
1572 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1575 * Structure of a directory entry
1577 #define EXT4_NAME_LEN 255
1579 struct ext4_dir_entry
{
1580 __le32 inode
; /* Inode number */
1581 __le16 rec_len
; /* Directory entry length */
1582 __le16 name_len
; /* Name length */
1583 char name
[EXT4_NAME_LEN
]; /* File name */
1587 * The new version of the directory entry. Since EXT4 structures are
1588 * stored in intel byte order, and the name_len field could never be
1589 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1592 struct ext4_dir_entry_2
{
1593 __le32 inode
; /* Inode number */
1594 __le16 rec_len
; /* Directory entry length */
1595 __u8 name_len
; /* Name length */
1597 char name
[EXT4_NAME_LEN
]; /* File name */
1601 * This is a bogus directory entry at the end of each leaf block that
1602 * records checksums.
1604 struct ext4_dir_entry_tail
{
1605 __le32 det_reserved_zero1
; /* Pretend to be unused */
1606 __le16 det_rec_len
; /* 12 */
1607 __u8 det_reserved_zero2
; /* Zero name length */
1608 __u8 det_reserved_ft
; /* 0xDE, fake file type */
1609 __le32 det_checksum
; /* crc32c(uuid+inum+dirblock) */
1612 #define EXT4_DIRENT_TAIL(block, blocksize) \
1613 ((struct ext4_dir_entry_tail *)(((void *)(block)) + \
1615 sizeof(struct ext4_dir_entry_tail))))
1618 * Ext4 directory file types. Only the low 3 bits are used. The
1619 * other bits are reserved for now.
1621 #define EXT4_FT_UNKNOWN 0
1622 #define EXT4_FT_REG_FILE 1
1623 #define EXT4_FT_DIR 2
1624 #define EXT4_FT_CHRDEV 3
1625 #define EXT4_FT_BLKDEV 4
1626 #define EXT4_FT_FIFO 5
1627 #define EXT4_FT_SOCK 6
1628 #define EXT4_FT_SYMLINK 7
1630 #define EXT4_FT_MAX 8
1632 #define EXT4_FT_DIR_CSUM 0xDE
1635 * EXT4_DIR_PAD defines the directory entries boundaries
1637 * NOTE: It must be a multiple of 4
1639 #define EXT4_DIR_PAD 4
1640 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1641 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1643 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1646 * If we ever get support for fs block sizes > page_size, we'll need
1647 * to remove the #if statements in the next two functions...
1649 static inline unsigned int
1650 ext4_rec_len_from_disk(__le16 dlen
, unsigned blocksize
)
1652 unsigned len
= le16_to_cpu(dlen
);
1654 #if (PAGE_CACHE_SIZE >= 65536)
1655 if (len
== EXT4_MAX_REC_LEN
|| len
== 0)
1657 return (len
& 65532) | ((len
& 3) << 16);
1663 static inline __le16
ext4_rec_len_to_disk(unsigned len
, unsigned blocksize
)
1665 if ((len
> blocksize
) || (blocksize
> (1 << 18)) || (len
& 3))
1667 #if (PAGE_CACHE_SIZE >= 65536)
1669 return cpu_to_le16(len
);
1670 if (len
== blocksize
) {
1671 if (blocksize
== 65536)
1672 return cpu_to_le16(EXT4_MAX_REC_LEN
);
1674 return cpu_to_le16(0);
1676 return cpu_to_le16((len
& 65532) | ((len
>> 16) & 3));
1678 return cpu_to_le16(len
);
1683 * Hash Tree Directory indexing
1684 * (c) Daniel Phillips, 2001
1687 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1688 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1689 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1690 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1691 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1693 /* Legal values for the dx_root hash_version field: */
1695 #define DX_HASH_LEGACY 0
1696 #define DX_HASH_HALF_MD4 1
1697 #define DX_HASH_TEA 2
1698 #define DX_HASH_LEGACY_UNSIGNED 3
1699 #define DX_HASH_HALF_MD4_UNSIGNED 4
1700 #define DX_HASH_TEA_UNSIGNED 5
1702 static inline u32
ext4_chksum(struct ext4_sb_info
*sbi
, u32 crc
,
1703 const void *address
, unsigned int length
)
1706 struct shash_desc shash
;
1711 BUG_ON(crypto_shash_descsize(sbi
->s_chksum_driver
)!=sizeof(desc
.ctx
));
1713 desc
.shash
.tfm
= sbi
->s_chksum_driver
;
1714 desc
.shash
.flags
= 0;
1715 *(u32
*)desc
.ctx
= crc
;
1717 err
= crypto_shash_update(&desc
.shash
, address
, length
);
1720 return *(u32
*)desc
.ctx
;
1725 /* hash info structure used by the directory hash */
1735 /* 32 and 64 bit signed EOF for dx directories */
1736 #define EXT4_HTREE_EOF_32BIT ((1UL << (32 - 1)) - 1)
1737 #define EXT4_HTREE_EOF_64BIT ((1ULL << (64 - 1)) - 1)
1741 * Control parameters used by ext4_htree_next_block
1743 #define HASH_NB_ALWAYS 1
1747 * Describe an inode's exact location on disk and in memory
1751 struct buffer_head
*bh
;
1752 unsigned long offset
;
1753 ext4_group_t block_group
;
1756 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
1758 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
1762 * This structure is stuffed into the struct file's private_data field
1763 * for directories. It is where we put information so that we can do
1764 * readdir operations in hash tree order.
1766 struct dir_private_info
{
1767 struct rb_root root
;
1768 struct rb_node
*curr_node
;
1769 struct fname
*extra_fname
;
1772 __u32 curr_minor_hash
;
1776 /* calculate the first block number of the group */
1777 static inline ext4_fsblk_t
1778 ext4_group_first_block_no(struct super_block
*sb
, ext4_group_t group_no
)
1780 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
1781 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
1785 * Special error return code only used by dx_probe() and its callers.
1787 #define ERR_BAD_DX_DIR -75000
1789 void ext4_get_group_no_and_offset(struct super_block
*sb
, ext4_fsblk_t blocknr
,
1790 ext4_group_t
*blockgrpp
, ext4_grpblk_t
*offsetp
);
1793 * Timeout and state flag for lazy initialization inode thread.
1795 #define EXT4_DEF_LI_WAIT_MULT 10
1796 #define EXT4_DEF_LI_MAX_START_DELAY 5
1797 #define EXT4_LAZYINIT_QUIT 0x0001
1798 #define EXT4_LAZYINIT_RUNNING 0x0002
1801 * Lazy inode table initialization info
1803 struct ext4_lazy_init
{
1804 unsigned long li_state
;
1805 struct list_head li_request_list
;
1806 struct mutex li_list_mtx
;
1809 struct ext4_li_request
{
1810 struct super_block
*lr_super
;
1811 struct ext4_sb_info
*lr_sbi
;
1812 ext4_group_t lr_next_group
;
1813 struct list_head lr_request
;
1814 unsigned long lr_next_sched
;
1815 unsigned long lr_timeout
;
1818 struct ext4_features
{
1819 struct kobject f_kobj
;
1820 struct completion f_kobj_unregister
;
1824 * This structure will be used for multiple mount protection. It will be
1825 * written into the block number saved in the s_mmp_block field in the
1826 * superblock. Programs that check MMP should assume that if
1827 * SEQ_FSCK (or any unknown code above SEQ_MAX) is present then it is NOT safe
1828 * to use the filesystem, regardless of how old the timestamp is.
1830 #define EXT4_MMP_MAGIC 0x004D4D50U /* ASCII for MMP */
1831 #define EXT4_MMP_SEQ_CLEAN 0xFF4D4D50U /* mmp_seq value for clean unmount */
1832 #define EXT4_MMP_SEQ_FSCK 0xE24D4D50U /* mmp_seq value when being fscked */
1833 #define EXT4_MMP_SEQ_MAX 0xE24D4D4FU /* maximum valid mmp_seq value */
1836 __le32 mmp_magic
; /* Magic number for MMP */
1837 __le32 mmp_seq
; /* Sequence no. updated periodically */
1840 * mmp_time, mmp_nodename & mmp_bdevname are only used for information
1841 * purposes and do not affect the correctness of the algorithm
1843 __le64 mmp_time
; /* Time last updated */
1844 char mmp_nodename
[64]; /* Node which last updated MMP block */
1845 char mmp_bdevname
[32]; /* Bdev which last updated MMP block */
1848 * mmp_check_interval is used to verify if the MMP block has been
1849 * updated on the block device. The value is updated based on the
1850 * maximum time to write the MMP block during an update cycle.
1852 __le16 mmp_check_interval
;
1855 __le32 mmp_pad2
[226];
1856 __le32 mmp_checksum
; /* crc32c(uuid+mmp_block) */
1859 /* arguments passed to the mmp thread */
1861 struct buffer_head
*bh
; /* bh from initial read_mmp_block() */
1862 struct super_block
*sb
; /* super block of the fs */
1866 * Check interval multiplier
1867 * The MMP block is written every update interval and initially checked every
1868 * update interval x the multiplier (the value is then adapted based on the
1869 * write latency). The reason is that writes can be delayed under load and we
1870 * don't want readers to incorrectly assume that the filesystem is no longer
1873 #define EXT4_MMP_CHECK_MULT 2UL
1876 * Minimum interval for MMP checking in seconds.
1878 #define EXT4_MMP_MIN_CHECK_INTERVAL 5UL
1881 * Maximum interval for MMP checking in seconds.
1883 #define EXT4_MMP_MAX_CHECK_INTERVAL 300UL
1886 * Function prototypes
1890 * Ok, these declarations are also in <linux/kernel.h> but none of the
1891 * ext4 source programs needs to include it so they are duplicated here.
1893 # define NORET_TYPE /**/
1894 # define ATTRIB_NORET __attribute__((noreturn))
1895 # define NORET_AND noreturn,
1898 extern unsigned int ext4_count_free(char *bitmap
, unsigned numchars
);
1899 void ext4_inode_bitmap_csum_set(struct super_block
*sb
, ext4_group_t group
,
1900 struct ext4_group_desc
*gdp
,
1901 struct buffer_head
*bh
, int sz
);
1902 int ext4_inode_bitmap_csum_verify(struct super_block
*sb
, ext4_group_t group
,
1903 struct ext4_group_desc
*gdp
,
1904 struct buffer_head
*bh
, int sz
);
1905 void ext4_block_bitmap_csum_set(struct super_block
*sb
, ext4_group_t group
,
1906 struct ext4_group_desc
*gdp
,
1907 struct buffer_head
*bh
);
1908 int ext4_block_bitmap_csum_verify(struct super_block
*sb
, ext4_group_t group
,
1909 struct ext4_group_desc
*gdp
,
1910 struct buffer_head
*bh
);
1913 extern void ext4_validate_block_bitmap(struct super_block
*sb
,
1914 struct ext4_group_desc
*desc
,
1915 unsigned int block_group
,
1916 struct buffer_head
*bh
);
1917 extern unsigned int ext4_block_group(struct super_block
*sb
,
1918 ext4_fsblk_t blocknr
);
1919 extern ext4_grpblk_t
ext4_block_group_offset(struct super_block
*sb
,
1920 ext4_fsblk_t blocknr
);
1921 extern int ext4_bg_has_super(struct super_block
*sb
, ext4_group_t group
);
1922 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
,
1923 ext4_group_t group
);
1924 extern ext4_fsblk_t
ext4_new_meta_blocks(handle_t
*handle
, struct inode
*inode
,
1927 unsigned long *count
,
1929 extern int ext4_claim_free_clusters(struct ext4_sb_info
*sbi
,
1930 s64 nclusters
, unsigned int flags
);
1931 extern ext4_fsblk_t
ext4_count_free_clusters(struct super_block
*);
1932 extern void ext4_check_blocks_bitmap(struct super_block
*);
1933 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
1934 ext4_group_t block_group
,
1935 struct buffer_head
** bh
);
1936 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
1938 extern struct buffer_head
*ext4_read_block_bitmap_nowait(struct super_block
*sb
,
1939 ext4_group_t block_group
);
1940 extern int ext4_wait_block_bitmap(struct super_block
*sb
,
1941 ext4_group_t block_group
,
1942 struct buffer_head
*bh
);
1943 extern struct buffer_head
*ext4_read_block_bitmap(struct super_block
*sb
,
1944 ext4_group_t block_group
);
1945 extern void ext4_init_block_bitmap(struct super_block
*sb
,
1946 struct buffer_head
*bh
,
1948 struct ext4_group_desc
*desc
);
1949 extern unsigned ext4_free_clusters_after_init(struct super_block
*sb
,
1950 ext4_group_t block_group
,
1951 struct ext4_group_desc
*gdp
);
1952 extern unsigned ext4_num_overhead_clusters(struct super_block
*sb
,
1953 ext4_group_t block_group
,
1954 struct ext4_group_desc
*gdp
);
1955 ext4_fsblk_t
ext4_inode_to_goal_block(struct inode
*);
1958 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode
*,
1960 struct ext4_dir_entry_2
*,
1961 struct buffer_head
*, char *, int,
1963 #define ext4_check_dir_entry(dir, filp, de, bh, buf, size, offset) \
1964 unlikely(__ext4_check_dir_entry(__func__, __LINE__, (dir), (filp), \
1965 (de), (bh), (buf), (size), (offset)))
1966 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
1968 struct ext4_dir_entry_2
*dirent
);
1969 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
1970 extern int ext4_find_dest_de(struct inode
*dir
, struct inode
*inode
,
1971 struct buffer_head
*bh
,
1972 void *buf
, int buf_size
,
1973 const char *name
, int namelen
,
1974 struct ext4_dir_entry_2
**dest_de
);
1975 void ext4_insert_dentry(struct inode
*inode
,
1976 struct ext4_dir_entry_2
*de
,
1978 const char *name
, int namelen
);
1979 static inline void ext4_update_dx_flag(struct inode
*inode
)
1981 if (!EXT4_HAS_COMPAT_FEATURE(inode
->i_sb
,
1982 EXT4_FEATURE_COMPAT_DIR_INDEX
))
1983 ext4_clear_inode_flag(inode
, EXT4_INODE_INDEX
);
1985 static unsigned char ext4_filetype_table
[] = {
1986 DT_UNKNOWN
, DT_REG
, DT_DIR
, DT_CHR
, DT_BLK
, DT_FIFO
, DT_SOCK
, DT_LNK
1989 static inline unsigned char get_dtype(struct super_block
*sb
, int filetype
)
1991 if (!EXT4_HAS_INCOMPAT_FEATURE(sb
, EXT4_FEATURE_INCOMPAT_FILETYPE
) ||
1992 (filetype
>= EXT4_FT_MAX
))
1995 return ext4_filetype_table
[filetype
];
1999 extern int ext4_sync_file(struct file
*, loff_t
, loff_t
, int);
2000 extern int ext4_flush_unwritten_io(struct inode
*);
2003 extern int ext4fs_dirhash(const char *name
, int len
, struct
2004 dx_hash_info
*hinfo
);
2007 extern struct inode
*__ext4_new_inode(handle_t
*, struct inode
*, umode_t
,
2008 const struct qstr
*qstr
, __u32 goal
,
2009 uid_t
*owner
, int handle_type
,
2010 unsigned int line_no
, int nblocks
);
2012 #define ext4_new_inode(handle, dir, mode, qstr, goal, owner) \
2013 __ext4_new_inode((handle), (dir), (mode), (qstr), (goal), (owner), \
2015 #define ext4_new_inode_start_handle(dir, mode, qstr, goal, owner, \
2017 __ext4_new_inode(NULL, (dir), (mode), (qstr), (goal), (owner), \
2018 (type), __LINE__, (nblocks))
2021 extern void ext4_free_inode(handle_t
*, struct inode
*);
2022 extern struct inode
* ext4_orphan_get(struct super_block
*, unsigned long);
2023 extern unsigned long ext4_count_free_inodes(struct super_block
*);
2024 extern unsigned long ext4_count_dirs(struct super_block
*);
2025 extern void ext4_check_inodes_bitmap(struct super_block
*);
2026 extern void ext4_mark_bitmap_end(int start_bit
, int end_bit
, char *bitmap
);
2027 extern int ext4_init_inode_table(struct super_block
*sb
,
2028 ext4_group_t group
, int barrier
);
2029 extern void ext4_end_bitmap_read(struct buffer_head
*bh
, int uptodate
);
2032 extern long ext4_mb_stats
;
2033 extern long ext4_mb_max_to_scan
;
2034 extern int ext4_mb_init(struct super_block
*);
2035 extern int ext4_mb_release(struct super_block
*);
2036 extern ext4_fsblk_t
ext4_mb_new_blocks(handle_t
*,
2037 struct ext4_allocation_request
*, int *);
2038 extern int ext4_mb_reserve_blocks(struct super_block
*, int);
2039 extern void ext4_discard_preallocations(struct inode
*);
2040 extern int __init
ext4_init_mballoc(void);
2041 extern void ext4_exit_mballoc(void);
2042 extern void ext4_free_blocks(handle_t
*handle
, struct inode
*inode
,
2043 struct buffer_head
*bh
, ext4_fsblk_t block
,
2044 unsigned long count
, int flags
);
2045 extern int ext4_mb_alloc_groupinfo(struct super_block
*sb
,
2046 ext4_group_t ngroups
);
2047 extern int ext4_mb_add_groupinfo(struct super_block
*sb
,
2048 ext4_group_t i
, struct ext4_group_desc
*desc
);
2049 extern int ext4_group_add_blocks(handle_t
*handle
, struct super_block
*sb
,
2050 ext4_fsblk_t block
, unsigned long count
);
2051 extern int ext4_trim_fs(struct super_block
*, struct fstrim_range
*);
2054 struct buffer_head
*ext4_getblk(handle_t
*, struct inode
*,
2055 ext4_lblk_t
, int, int *);
2056 struct buffer_head
*ext4_bread(handle_t
*, struct inode
*,
2057 ext4_lblk_t
, int, int *);
2058 int ext4_get_block_write(struct inode
*inode
, sector_t iblock
,
2059 struct buffer_head
*bh_result
, int create
);
2060 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
2061 struct buffer_head
*bh_result
, int create
);
2062 int ext4_da_get_block_prep(struct inode
*inode
, sector_t iblock
,
2063 struct buffer_head
*bh
, int create
);
2064 int ext4_walk_page_buffers(handle_t
*handle
,
2065 struct buffer_head
*head
,
2069 int (*fn
)(handle_t
*handle
,
2070 struct buffer_head
*bh
));
2071 int do_journal_get_write_access(handle_t
*handle
,
2072 struct buffer_head
*bh
);
2073 #define FALL_BACK_TO_NONDELALLOC 1
2074 #define CONVERT_INLINE_DATA 2
2076 extern struct inode
*ext4_iget(struct super_block
*, unsigned long);
2077 extern int ext4_write_inode(struct inode
*, struct writeback_control
*);
2078 extern int ext4_setattr(struct dentry
*, struct iattr
*);
2079 extern int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
2080 struct kstat
*stat
);
2081 extern void ext4_evict_inode(struct inode
*);
2082 extern void ext4_clear_inode(struct inode
*);
2083 extern int ext4_sync_inode(handle_t
*, struct inode
*);
2084 extern void ext4_dirty_inode(struct inode
*, int);
2085 extern int ext4_change_inode_journal_flag(struct inode
*, int);
2086 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
2087 extern int ext4_can_truncate(struct inode
*inode
);
2088 extern void ext4_truncate(struct inode
*);
2089 extern int ext4_punch_hole(struct file
*file
, loff_t offset
, loff_t length
);
2090 extern int ext4_truncate_restart_trans(handle_t
*, struct inode
*, int nblocks
);
2091 extern void ext4_set_inode_flags(struct inode
*);
2092 extern void ext4_get_inode_flags(struct ext4_inode_info
*);
2093 extern int ext4_alloc_da_blocks(struct inode
*inode
);
2094 extern void ext4_set_aops(struct inode
*inode
);
2095 extern int ext4_writepage_trans_blocks(struct inode
*);
2096 extern int ext4_chunk_trans_blocks(struct inode
*, int nrblocks
);
2097 extern int ext4_discard_partial_page_buffers(handle_t
*handle
,
2098 struct address_space
*mapping
, loff_t from
,
2099 loff_t length
, int flags
);
2100 extern int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
2101 extern qsize_t
*ext4_get_reserved_space(struct inode
*inode
);
2102 extern void ext4_da_update_reserve_space(struct inode
*inode
,
2103 int used
, int quota_claim
);
2106 extern int ext4_ind_map_blocks(handle_t
*handle
, struct inode
*inode
,
2107 struct ext4_map_blocks
*map
, int flags
);
2108 extern ssize_t
ext4_ind_direct_IO(int rw
, struct kiocb
*iocb
,
2109 const struct iovec
*iov
, loff_t offset
,
2110 unsigned long nr_segs
);
2111 extern int ext4_ind_calc_metadata_amount(struct inode
*inode
, sector_t lblock
);
2112 extern int ext4_ind_trans_blocks(struct inode
*inode
, int nrblocks
, int chunk
);
2113 extern void ext4_ind_truncate(struct inode
*inode
);
2114 extern int ext4_ind_punch_hole(struct file
*file
, loff_t offset
, loff_t length
);
2117 extern long ext4_ioctl(struct file
*, unsigned int, unsigned long);
2118 extern long ext4_compat_ioctl(struct file
*, unsigned int, unsigned long);
2121 extern int ext4_ext_migrate(struct inode
*);
2124 extern int ext4_dirent_csum_verify(struct inode
*inode
,
2125 struct ext4_dir_entry
*dirent
);
2126 extern int ext4_orphan_add(handle_t
*, struct inode
*);
2127 extern int ext4_orphan_del(handle_t
*, struct inode
*);
2128 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
2129 __u32 start_minor_hash
, __u32
*next_hash
);
2130 extern int search_dir(struct buffer_head
*bh
,
2134 const struct qstr
*d_name
,
2135 unsigned int offset
,
2136 struct ext4_dir_entry_2
**res_dir
);
2137 extern int ext4_generic_delete_entry(handle_t
*handle
,
2139 struct ext4_dir_entry_2
*de_del
,
2140 struct buffer_head
*bh
,
2146 extern int ext4_group_add(struct super_block
*sb
,
2147 struct ext4_new_group_data
*input
);
2148 extern int ext4_group_extend(struct super_block
*sb
,
2149 struct ext4_super_block
*es
,
2150 ext4_fsblk_t n_blocks_count
);
2151 extern int ext4_resize_fs(struct super_block
*sb
, ext4_fsblk_t n_blocks_count
);
2154 extern int ext4_calculate_overhead(struct super_block
*sb
);
2155 extern int ext4_superblock_csum_verify(struct super_block
*sb
,
2156 struct ext4_super_block
*es
);
2157 extern void ext4_superblock_csum_set(struct super_block
*sb
);
2158 extern void *ext4_kvmalloc(size_t size
, gfp_t flags
);
2159 extern void *ext4_kvzalloc(size_t size
, gfp_t flags
);
2160 extern void ext4_kvfree(void *ptr
);
2161 extern int ext4_alloc_flex_bg_array(struct super_block
*sb
,
2162 ext4_group_t ngroup
);
2163 extern const char *ext4_decode_error(struct super_block
*sb
, int errno
,
2165 extern __printf(4, 5)
2166 void __ext4_error(struct super_block
*, const char *, unsigned int,
2168 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
2169 __LINE__, ## message)
2170 extern __printf(5, 6)
2171 void ext4_error_inode(struct inode
*, const char *, unsigned int, ext4_fsblk_t
,
2173 extern __printf(5, 6)
2174 void ext4_error_file(struct file
*, const char *, unsigned int, ext4_fsblk_t
,
2176 extern void __ext4_std_error(struct super_block
*, const char *,
2178 extern __printf(4, 5)
2179 void __ext4_abort(struct super_block
*, const char *, unsigned int,
2181 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
2182 __LINE__, ## message)
2183 extern __printf(4, 5)
2184 void __ext4_warning(struct super_block
*, const char *, unsigned int,
2186 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
2187 __LINE__, ## message)
2188 extern __printf(3, 4)
2189 void ext4_msg(struct super_block
*, const char *, const char *, ...);
2190 extern void __dump_mmp_msg(struct super_block
*, struct mmp_struct
*mmp
,
2191 const char *, unsigned int, const char *);
2192 #define dump_mmp_msg(sb, mmp, msg) __dump_mmp_msg(sb, mmp, __func__, \
2194 extern __printf(7, 8)
2195 void __ext4_grp_locked_error(const char *, unsigned int,
2196 struct super_block
*, ext4_group_t
,
2197 unsigned long, ext4_fsblk_t
,
2199 #define ext4_grp_locked_error(sb, grp, message...) \
2200 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
2201 extern void ext4_update_dynamic_rev(struct super_block
*sb
);
2202 extern int ext4_update_compat_feature(handle_t
*handle
, struct super_block
*sb
,
2204 extern int ext4_update_rocompat_feature(handle_t
*handle
,
2205 struct super_block
*sb
, __u32 rocompat
);
2206 extern int ext4_update_incompat_feature(handle_t
*handle
,
2207 struct super_block
*sb
, __u32 incompat
);
2208 extern ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
2209 struct ext4_group_desc
*bg
);
2210 extern ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
2211 struct ext4_group_desc
*bg
);
2212 extern ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
2213 struct ext4_group_desc
*bg
);
2214 extern __u32
ext4_free_group_clusters(struct super_block
*sb
,
2215 struct ext4_group_desc
*bg
);
2216 extern __u32
ext4_free_inodes_count(struct super_block
*sb
,
2217 struct ext4_group_desc
*bg
);
2218 extern __u32
ext4_used_dirs_count(struct super_block
*sb
,
2219 struct ext4_group_desc
*bg
);
2220 extern __u32
ext4_itable_unused_count(struct super_block
*sb
,
2221 struct ext4_group_desc
*bg
);
2222 extern void ext4_block_bitmap_set(struct super_block
*sb
,
2223 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2224 extern void ext4_inode_bitmap_set(struct super_block
*sb
,
2225 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2226 extern void ext4_inode_table_set(struct super_block
*sb
,
2227 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
2228 extern void ext4_free_group_clusters_set(struct super_block
*sb
,
2229 struct ext4_group_desc
*bg
,
2231 extern void ext4_free_inodes_set(struct super_block
*sb
,
2232 struct ext4_group_desc
*bg
, __u32 count
);
2233 extern void ext4_used_dirs_set(struct super_block
*sb
,
2234 struct ext4_group_desc
*bg
, __u32 count
);
2235 extern void ext4_itable_unused_set(struct super_block
*sb
,
2236 struct ext4_group_desc
*bg
, __u32 count
);
2237 extern int ext4_group_desc_csum_verify(struct super_block
*sb
, __u32 group
,
2238 struct ext4_group_desc
*gdp
);
2239 extern void ext4_group_desc_csum_set(struct super_block
*sb
, __u32 group
,
2240 struct ext4_group_desc
*gdp
);
2241 extern int ext4_register_li_request(struct super_block
*sb
,
2242 ext4_group_t first_not_zeroed
);
2244 static inline int ext4_has_group_desc_csum(struct super_block
*sb
)
2246 return EXT4_HAS_RO_COMPAT_FEATURE(sb
,
2247 EXT4_FEATURE_RO_COMPAT_GDT_CSUM
|
2248 EXT4_FEATURE_RO_COMPAT_METADATA_CSUM
);
2251 static inline ext4_fsblk_t
ext4_blocks_count(struct ext4_super_block
*es
)
2253 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_blocks_count_hi
) << 32) |
2254 le32_to_cpu(es
->s_blocks_count_lo
);
2257 static inline ext4_fsblk_t
ext4_r_blocks_count(struct ext4_super_block
*es
)
2259 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_r_blocks_count_hi
) << 32) |
2260 le32_to_cpu(es
->s_r_blocks_count_lo
);
2263 static inline ext4_fsblk_t
ext4_free_blocks_count(struct ext4_super_block
*es
)
2265 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_free_blocks_count_hi
) << 32) |
2266 le32_to_cpu(es
->s_free_blocks_count_lo
);
2269 static inline void ext4_blocks_count_set(struct ext4_super_block
*es
,
2272 es
->s_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2273 es
->s_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2276 static inline void ext4_free_blocks_count_set(struct ext4_super_block
*es
,
2279 es
->s_free_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2280 es
->s_free_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2283 static inline void ext4_r_blocks_count_set(struct ext4_super_block
*es
,
2286 es
->s_r_blocks_count_lo
= cpu_to_le32((u32
)blk
);
2287 es
->s_r_blocks_count_hi
= cpu_to_le32(blk
>> 32);
2290 static inline loff_t
ext4_isize(struct ext4_inode
*raw_inode
)
2292 if (S_ISREG(le16_to_cpu(raw_inode
->i_mode
)))
2293 return ((loff_t
)le32_to_cpu(raw_inode
->i_size_high
) << 32) |
2294 le32_to_cpu(raw_inode
->i_size_lo
);
2296 return (loff_t
) le32_to_cpu(raw_inode
->i_size_lo
);
2299 static inline void ext4_isize_set(struct ext4_inode
*raw_inode
, loff_t i_size
)
2301 raw_inode
->i_size_lo
= cpu_to_le32(i_size
);
2302 raw_inode
->i_size_high
= cpu_to_le32(i_size
>> 32);
2306 struct ext4_group_info
*ext4_get_group_info(struct super_block
*sb
,
2309 struct ext4_group_info
***grp_info
;
2310 long indexv
, indexh
;
2311 grp_info
= EXT4_SB(sb
)->s_group_info
;
2312 indexv
= group
>> (EXT4_DESC_PER_BLOCK_BITS(sb
));
2313 indexh
= group
& ((EXT4_DESC_PER_BLOCK(sb
)) - 1);
2314 return grp_info
[indexv
][indexh
];
2318 * Reading s_groups_count requires using smp_rmb() afterwards. See
2319 * the locking protocol documented in the comments of ext4_group_add()
2322 static inline ext4_group_t
ext4_get_groups_count(struct super_block
*sb
)
2324 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
2330 static inline ext4_group_t
ext4_flex_group(struct ext4_sb_info
*sbi
,
2331 ext4_group_t block_group
)
2333 return block_group
>> sbi
->s_log_groups_per_flex
;
2336 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info
*sbi
)
2338 return 1 << sbi
->s_log_groups_per_flex
;
2341 #define ext4_std_error(sb, errno) \
2344 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
2348 /* Each CPU can accumulate percpu_counter_batch clusters in their local
2349 * counters. So we need to make sure we have free clusters more
2350 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
2352 #define EXT4_FREECLUSTERS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
2354 #define EXT4_FREECLUSTERS_WATERMARK 0
2357 static inline void ext4_update_i_disksize(struct inode
*inode
, loff_t newsize
)
2360 * XXX: replace with spinlock if seen contended -bzzz
2362 down_write(&EXT4_I(inode
)->i_data_sem
);
2363 if (newsize
> EXT4_I(inode
)->i_disksize
)
2364 EXT4_I(inode
)->i_disksize
= newsize
;
2365 up_write(&EXT4_I(inode
)->i_data_sem
);
2369 struct ext4_group_info
{
2370 unsigned long bb_state
;
2371 struct rb_root bb_free_root
;
2372 ext4_grpblk_t bb_first_free
; /* first free block */
2373 ext4_grpblk_t bb_free
; /* total free blocks */
2374 ext4_grpblk_t bb_fragments
; /* nr of freespace fragments */
2375 ext4_grpblk_t bb_largest_free_order
;/* order of largest frag in BG */
2376 struct list_head bb_prealloc_list
;
2380 struct rw_semaphore alloc_sem
;
2381 ext4_grpblk_t bb_counters
[]; /* Nr of free power-of-two-block
2382 * regions, index is order.
2383 * bb_counters[3] = 5 means
2384 * 5 free 8-block regions. */
2387 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
2388 #define EXT4_GROUP_INFO_WAS_TRIMMED_BIT 1
2390 #define EXT4_MB_GRP_NEED_INIT(grp) \
2391 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
2393 #define EXT4_MB_GRP_WAS_TRIMMED(grp) \
2394 (test_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2395 #define EXT4_MB_GRP_SET_TRIMMED(grp) \
2396 (set_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2397 #define EXT4_MB_GRP_CLEAR_TRIMMED(grp) \
2398 (clear_bit(EXT4_GROUP_INFO_WAS_TRIMMED_BIT, &((grp)->bb_state)))
2400 #define EXT4_MAX_CONTENTION 8
2401 #define EXT4_CONTENTION_THRESHOLD 2
2403 static inline spinlock_t
*ext4_group_lock_ptr(struct super_block
*sb
,
2406 return bgl_lock_ptr(EXT4_SB(sb
)->s_blockgroup_lock
, group
);
2410 * Returns true if the filesystem is busy enough that attempts to
2411 * access the block group locks has run into contention.
2413 static inline int ext4_fs_is_busy(struct ext4_sb_info
*sbi
)
2415 return (atomic_read(&sbi
->s_lock_busy
) > EXT4_CONTENTION_THRESHOLD
);
2418 static inline void ext4_lock_group(struct super_block
*sb
, ext4_group_t group
)
2420 spinlock_t
*lock
= ext4_group_lock_ptr(sb
, group
);
2421 if (spin_trylock(lock
))
2423 * We're able to grab the lock right away, so drop the
2424 * lock contention counter.
2426 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, -1, 0);
2429 * The lock is busy, so bump the contention counter,
2430 * and then wait on the spin lock.
2432 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, 1,
2433 EXT4_MAX_CONTENTION
);
2438 static inline void ext4_unlock_group(struct super_block
*sb
,
2441 spin_unlock(ext4_group_lock_ptr(sb
, group
));
2445 * Block validity checking
2447 #define ext4_check_indirect_blockref(inode, bh) \
2448 ext4_check_blockref(__func__, __LINE__, inode, \
2449 (__le32 *)(bh)->b_data, \
2450 EXT4_ADDR_PER_BLOCK((inode)->i_sb))
2452 #define ext4_ind_check_inode(inode) \
2453 ext4_check_blockref(__func__, __LINE__, inode, \
2454 EXT4_I(inode)->i_data, \
2458 * Inodes and files operations
2462 extern const struct file_operations ext4_dir_operations
;
2465 extern const struct inode_operations ext4_file_inode_operations
;
2466 extern const struct file_operations ext4_file_operations
;
2467 extern loff_t
ext4_llseek(struct file
*file
, loff_t offset
, int origin
);
2468 extern void ext4_unwritten_wait(struct inode
*inode
);
2471 extern int ext4_has_inline_data(struct inode
*inode
);
2472 extern int ext4_get_inline_size(struct inode
*inode
);
2473 extern int ext4_get_max_inline_size(struct inode
*inode
);
2474 extern int ext4_find_inline_data_nolock(struct inode
*inode
);
2475 extern void ext4_write_inline_data(struct inode
*inode
,
2476 struct ext4_iloc
*iloc
,
2477 void *buffer
, loff_t pos
,
2479 extern int ext4_prepare_inline_data(handle_t
*handle
, struct inode
*inode
,
2481 extern int ext4_init_inline_data(handle_t
*handle
, struct inode
*inode
,
2483 extern int ext4_destroy_inline_data(handle_t
*handle
, struct inode
*inode
);
2485 extern int ext4_readpage_inline(struct inode
*inode
, struct page
*page
);
2486 extern int ext4_try_to_write_inline_data(struct address_space
*mapping
,
2487 struct inode
*inode
,
2488 loff_t pos
, unsigned len
,
2490 struct page
**pagep
);
2491 extern int ext4_write_inline_data_end(struct inode
*inode
,
2492 loff_t pos
, unsigned len
,
2495 extern struct buffer_head
*
2496 ext4_journalled_write_inline_data(struct inode
*inode
,
2499 extern int ext4_da_write_inline_data_begin(struct address_space
*mapping
,
2500 struct inode
*inode
,
2501 loff_t pos
, unsigned len
,
2503 struct page
**pagep
,
2505 extern int ext4_da_write_inline_data_end(struct inode
*inode
, loff_t pos
,
2506 unsigned len
, unsigned copied
,
2508 extern int ext4_try_add_inline_entry(handle_t
*handle
, struct dentry
*dentry
,
2509 struct inode
*inode
);
2510 extern int ext4_try_create_inline_dir(handle_t
*handle
,
2511 struct inode
*parent
,
2512 struct inode
*inode
);
2513 extern int ext4_read_inline_dir(struct file
*filp
,
2514 void *dirent
, filldir_t filldir
,
2515 int *has_inline_data
);
2516 extern struct buffer_head
*ext4_find_inline_entry(struct inode
*dir
,
2517 const struct qstr
*d_name
,
2518 struct ext4_dir_entry_2
**res_dir
,
2519 int *has_inline_data
);
2520 extern int ext4_delete_inline_entry(handle_t
*handle
,
2522 struct ext4_dir_entry_2
*de_del
,
2523 struct buffer_head
*bh
,
2524 int *has_inline_data
);
2525 extern int empty_inline_dir(struct inode
*dir
, int *has_inline_data
);
2526 extern struct buffer_head
*ext4_get_first_inline_block(struct inode
*inode
,
2527 struct ext4_dir_entry_2
**parent_de
,
2529 extern int ext4_inline_data_fiemap(struct inode
*inode
,
2530 struct fiemap_extent_info
*fieinfo
,
2532 extern int ext4_try_to_evict_inline_data(handle_t
*handle
,
2533 struct inode
*inode
,
2535 extern void ext4_inline_data_truncate(struct inode
*inode
, int *has_inline
);
2537 extern int ext4_convert_inline_data(struct inode
*inode
);
2540 extern const struct inode_operations ext4_dir_inode_operations
;
2541 extern const struct inode_operations ext4_special_inode_operations
;
2542 extern struct dentry
*ext4_get_parent(struct dentry
*child
);
2543 extern struct ext4_dir_entry_2
*ext4_init_dot_dotdot(struct inode
*inode
,
2544 struct ext4_dir_entry_2
*de
,
2545 int blocksize
, int csum_size
,
2546 unsigned int parent_ino
, int dotdot_real_len
);
2547 extern void initialize_dirent_tail(struct ext4_dir_entry_tail
*t
,
2548 unsigned int blocksize
);
2549 extern int ext4_handle_dirty_dirent_node(handle_t
*handle
,
2550 struct inode
*inode
,
2551 struct buffer_head
*bh
);
2554 extern const struct inode_operations ext4_symlink_inode_operations
;
2555 extern const struct inode_operations ext4_fast_symlink_inode_operations
;
2557 /* block_validity */
2558 extern void ext4_release_system_zone(struct super_block
*sb
);
2559 extern int ext4_setup_system_zone(struct super_block
*sb
);
2560 extern int __init
ext4_init_system_zone(void);
2561 extern void ext4_exit_system_zone(void);
2562 extern int ext4_data_block_valid(struct ext4_sb_info
*sbi
,
2563 ext4_fsblk_t start_blk
,
2564 unsigned int count
);
2565 extern int ext4_check_blockref(const char *, unsigned int,
2566 struct inode
*, __le32
*, unsigned int);
2569 struct ext4_ext_path
;
2572 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
2573 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
2574 extern int ext4_ext_index_trans_blocks(struct inode
*inode
, int nrblocks
,
2576 extern int ext4_ext_map_blocks(handle_t
*handle
, struct inode
*inode
,
2577 struct ext4_map_blocks
*map
, int flags
);
2578 extern void ext4_ext_truncate(struct inode
*);
2579 extern int ext4_ext_punch_hole(struct file
*file
, loff_t offset
,
2581 extern void ext4_ext_init(struct super_block
*);
2582 extern void ext4_ext_release(struct super_block
*);
2583 extern long ext4_fallocate(struct file
*file
, int mode
, loff_t offset
,
2585 extern int ext4_convert_unwritten_extents(struct inode
*inode
, loff_t offset
,
2587 extern int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
2588 struct ext4_map_blocks
*map
, int flags
);
2589 extern int ext4_ext_calc_metadata_amount(struct inode
*inode
,
2590 ext4_lblk_t lblocks
);
2591 extern int ext4_extent_tree_init(handle_t
*, struct inode
*);
2592 extern int ext4_ext_calc_credits_for_single_extent(struct inode
*inode
,
2594 struct ext4_ext_path
*path
);
2595 extern int ext4_can_extents_be_merged(struct inode
*inode
,
2596 struct ext4_extent
*ex1
,
2597 struct ext4_extent
*ex2
);
2598 extern int ext4_ext_insert_extent(handle_t
*, struct inode
*,
2599 struct ext4_ext_path
*,
2600 struct ext4_extent
*, int);
2601 extern struct ext4_ext_path
*ext4_ext_find_extent(struct inode
*, ext4_lblk_t
,
2602 struct ext4_ext_path
*);
2603 extern void ext4_ext_drop_refs(struct ext4_ext_path
*);
2604 extern int ext4_ext_check_inode(struct inode
*inode
);
2605 extern int ext4_find_delalloc_cluster(struct inode
*inode
, ext4_lblk_t lblk
);
2606 extern int ext4_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
2607 __u64 start
, __u64 len
);
2611 extern int ext4_move_extents(struct file
*o_filp
, struct file
*d_filp
,
2612 __u64 start_orig
, __u64 start_donor
,
2613 __u64 len
, __u64
*moved_len
);
2616 extern int __init
ext4_init_pageio(void);
2617 extern void ext4_add_complete_io(ext4_io_end_t
*io_end
);
2618 extern void ext4_exit_pageio(void);
2619 extern void ext4_ioend_wait(struct inode
*);
2620 extern void ext4_free_io_end(ext4_io_end_t
*io
);
2621 extern ext4_io_end_t
*ext4_init_io_end(struct inode
*inode
, gfp_t flags
);
2622 extern void ext4_end_io_work(struct work_struct
*work
);
2623 extern void ext4_io_submit(struct ext4_io_submit
*io
);
2624 extern int ext4_bio_write_page(struct ext4_io_submit
*io
,
2627 struct writeback_control
*wbc
);
2630 extern int ext4_multi_mount_protect(struct super_block
*, ext4_fsblk_t
);
2631 extern void ext4_mmp_csum_set(struct super_block
*sb
, struct mmp_struct
*mmp
);
2632 extern int ext4_mmp_csum_verify(struct super_block
*sb
,
2633 struct mmp_struct
*mmp
);
2635 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2636 enum ext4_state_bits
{
2637 BH_Uninit
/* blocks are allocated but uninitialized on disk */
2638 = BH_JBDPrivateStart
,
2639 BH_AllocFromCluster
, /* allocated blocks were part of already
2640 * allocated cluster. Note that this flag will
2641 * never, ever appear in a buffer_head's state
2642 * flag. See EXT4_MAP_FROM_CLUSTER to see where
2646 BUFFER_FNS(Uninit
, uninit
)
2647 TAS_BUFFER_FNS(Uninit
, uninit
)
2650 * Add new method to test whether block and inode bitmaps are properly
2651 * initialized. With uninit_bg reading the block from disk is not enough
2652 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2654 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2656 static inline int bitmap_uptodate(struct buffer_head
*bh
)
2658 return (buffer_uptodate(bh
) &&
2659 test_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
));
2661 static inline void set_bitmap_uptodate(struct buffer_head
*bh
)
2663 set_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
);
2667 * Disable DIO read nolock optimization, so new dioreaders will be forced
2670 static inline void ext4_inode_block_unlocked_dio(struct inode
*inode
)
2672 ext4_set_inode_state(inode
, EXT4_STATE_DIOREAD_LOCK
);
2675 static inline void ext4_inode_resume_unlocked_dio(struct inode
*inode
)
2678 ext4_clear_inode_state(inode
, EXT4_STATE_DIOREAD_LOCK
);
2681 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2683 /* For ioend & aio unwritten conversion wait queues */
2684 #define EXT4_WQ_HASH_SZ 37
2685 #define ext4_ioend_wq(v) (&ext4__ioend_wq[((unsigned long)(v)) %\
2687 #define ext4_aio_mutex(v) (&ext4__aio_mutex[((unsigned long)(v)) %\
2689 extern wait_queue_head_t ext4__ioend_wq
[EXT4_WQ_HASH_SZ
];
2690 extern struct mutex ext4__aio_mutex
[EXT4_WQ_HASH_SZ
];
2692 #define EXT4_RESIZING 0
2693 extern int ext4_resize_begin(struct super_block
*sb
);
2694 extern void ext4_resize_end(struct super_block
*sb
);
2696 #endif /* __KERNEL__ */
2698 #endif /* _EXT4_H */