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>
33 #include <linux/compat.h>
37 * The fourth extended filesystem constants/structures
41 * Define EXT4FS_DEBUG to produce debug messages
49 #define ext4_debug(f, a...) \
51 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
52 __FILE__, __LINE__, __func__); \
53 printk(KERN_DEBUG f, ## a); \
56 #define ext4_debug(f, a...) do {} while (0)
59 #define EXT4_ERROR_INODE(inode, fmt, a...) \
60 ext4_error_inode((inode), __func__, __LINE__, 0, (fmt), ## a)
62 #define EXT4_ERROR_INODE_BLOCK(inode, block, fmt, a...) \
63 ext4_error_inode((inode), __func__, __LINE__, (block), (fmt), ## a)
65 #define EXT4_ERROR_FILE(file, fmt, a...) \
66 ext4_error_file(__func__, __LINE__, (file), (fmt), ## a)
68 /* data type for block offset of block group */
69 typedef int ext4_grpblk_t
;
71 /* data type for filesystem-wide blocks number */
72 typedef unsigned long long ext4_fsblk_t
;
74 /* data type for file logical block number */
75 typedef __u32 ext4_lblk_t
;
77 /* data type for block group number */
78 typedef unsigned int ext4_group_t
;
81 * Flags used in mballoc's allocation_context flags field.
83 * Also used to show what's going on for debugging purposes when the
84 * flag field is exported via the traceport interface
87 /* prefer goal again. length */
88 #define EXT4_MB_HINT_MERGE 0x0001
89 /* blocks already reserved */
90 #define EXT4_MB_HINT_RESERVED 0x0002
91 /* metadata is being allocated */
92 #define EXT4_MB_HINT_METADATA 0x0004
93 /* first blocks in the file */
94 #define EXT4_MB_HINT_FIRST 0x0008
95 /* search for the best chunk */
96 #define EXT4_MB_HINT_BEST 0x0010
97 /* data is being allocated */
98 #define EXT4_MB_HINT_DATA 0x0020
99 /* don't preallocate (for tails) */
100 #define EXT4_MB_HINT_NOPREALLOC 0x0040
101 /* allocate for locality group */
102 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
103 /* allocate goal blocks or none */
104 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
105 /* goal is meaningful */
106 #define EXT4_MB_HINT_TRY_GOAL 0x0200
107 /* blocks already pre-reserved by delayed allocation */
108 #define EXT4_MB_DELALLOC_RESERVED 0x0400
109 /* We are doing stream allocation */
110 #define EXT4_MB_STREAM_ALLOC 0x0800
113 struct ext4_allocation_request
{
114 /* target inode for block we're allocating */
116 /* how many blocks we want to allocate */
118 /* logical block in target inode */
120 /* the closest logical allocated block to the left */
122 /* the closest logical allocated block to the right */
124 /* phys. target (a hint) */
126 /* phys. block for the closest logical allocated block to the left */
128 /* phys. block for the closest logical allocated block to the right */
130 /* flags. see above EXT4_MB_HINT_* */
135 * Logical to physical block mapping, used by ext4_map_blocks()
137 * This structure is used to pass requests into ext4_map_blocks() as
138 * well as to store the information returned by ext4_map_blocks(). It
139 * takes less room on the stack than a struct buffer_head.
141 #define EXT4_MAP_NEW (1 << BH_New)
142 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
143 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
144 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
145 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
146 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
147 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
150 struct ext4_map_blocks
{
154 unsigned int m_flags
;
158 * For delayed allocation tracking
160 struct mpage_da_data
{
162 sector_t b_blocknr
; /* start block number of extent */
163 size_t b_size
; /* size of extent */
164 unsigned long b_state
; /* state of the extent */
165 unsigned long first_page
, next_page
; /* extent of pages */
166 struct writeback_control
*wbc
;
171 #define EXT4_IO_UNWRITTEN 0x1
172 typedef struct ext4_io_end
{
173 struct list_head list
; /* per-file finished IO list */
174 struct inode
*inode
; /* file being written to */
175 unsigned int flag
; /* unwritten or not */
176 struct page
*page
; /* page struct for buffer write */
177 loff_t offset
; /* offset in the file */
178 ssize_t size
; /* size of the extent */
179 struct work_struct work
; /* data work queue */
180 struct kiocb
*iocb
; /* iocb struct for AIO */
181 int result
; /* error value for AIO */
185 * Special inodes numbers
187 #define EXT4_BAD_INO 1 /* Bad blocks inode */
188 #define EXT4_ROOT_INO 2 /* Root inode */
189 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
190 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
191 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
192 #define EXT4_JOURNAL_INO 8 /* Journal inode */
194 /* First non-reserved inode for old ext4 filesystems */
195 #define EXT4_GOOD_OLD_FIRST_INO 11
198 * Maximal count of links to a file
200 #define EXT4_LINK_MAX 65000
203 * Macro-instructions used to manage several block sizes
205 #define EXT4_MIN_BLOCK_SIZE 1024
206 #define EXT4_MAX_BLOCK_SIZE 65536
207 #define EXT4_MIN_BLOCK_LOG_SIZE 10
208 #define EXT4_MAX_BLOCK_LOG_SIZE 16
210 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
212 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
214 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
216 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
218 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
221 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
222 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
223 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
225 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
226 EXT4_GOOD_OLD_INODE_SIZE : \
228 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
229 EXT4_GOOD_OLD_FIRST_INO : \
232 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
235 * Structure of a blocks group descriptor
237 struct ext4_group_desc
239 __le32 bg_block_bitmap_lo
; /* Blocks bitmap block */
240 __le32 bg_inode_bitmap_lo
; /* Inodes bitmap block */
241 __le32 bg_inode_table_lo
; /* Inodes table block */
242 __le16 bg_free_blocks_count_lo
;/* Free blocks count */
243 __le16 bg_free_inodes_count_lo
;/* Free inodes count */
244 __le16 bg_used_dirs_count_lo
; /* Directories count */
245 __le16 bg_flags
; /* EXT4_BG_flags (INODE_UNINIT, etc) */
246 __u32 bg_reserved
[2]; /* Likely block/inode bitmap checksum */
247 __le16 bg_itable_unused_lo
; /* Unused inodes count */
248 __le16 bg_checksum
; /* crc16(sb_uuid+group+desc) */
249 __le32 bg_block_bitmap_hi
; /* Blocks bitmap block MSB */
250 __le32 bg_inode_bitmap_hi
; /* Inodes bitmap block MSB */
251 __le32 bg_inode_table_hi
; /* Inodes table block MSB */
252 __le16 bg_free_blocks_count_hi
;/* Free blocks count MSB */
253 __le16 bg_free_inodes_count_hi
;/* Free inodes count MSB */
254 __le16 bg_used_dirs_count_hi
; /* Directories count MSB */
255 __le16 bg_itable_unused_hi
; /* Unused inodes count MSB */
256 __u32 bg_reserved2
[3];
260 * Structure of a flex block group info
264 atomic_t free_inodes
;
265 atomic_t free_blocks
;
269 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
270 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
271 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
274 * Macro-instructions used to manage group descriptors
276 #define EXT4_MIN_DESC_SIZE 32
277 #define EXT4_MIN_DESC_SIZE_64BIT 64
278 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
279 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
281 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
282 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
283 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
284 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
286 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
287 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
288 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
292 * Constants relative to the data blocks
294 #define EXT4_NDIR_BLOCKS 12
295 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
296 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
297 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
298 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
303 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
304 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
305 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
306 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
307 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
308 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
309 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
310 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
311 /* Reserved for compression usage... */
312 #define EXT4_DIRTY_FL 0x00000100
313 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
314 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
315 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
316 /* End compression flags --- maybe not all used */
317 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
318 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
319 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
320 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
321 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
322 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
323 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
324 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
325 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
326 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
327 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
329 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
330 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
332 /* Flags that should be inherited by new inodes from their parent. */
333 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
334 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
335 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
336 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
337 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
339 /* Flags that are appropriate for regular files (all but dir-specific ones). */
340 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
342 /* Flags that are appropriate for non-directories/regular files. */
343 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
345 /* Mask out flags that are inappropriate for the given type of inode. */
346 static inline __u32
ext4_mask_flags(umode_t mode
, __u32 flags
)
350 else if (S_ISREG(mode
))
351 return flags
& EXT4_REG_FLMASK
;
353 return flags
& EXT4_OTHER_FLMASK
;
357 * Inode flags used for atomic set/get
360 EXT4_INODE_SECRM
= 0, /* Secure deletion */
361 EXT4_INODE_UNRM
= 1, /* Undelete */
362 EXT4_INODE_COMPR
= 2, /* Compress file */
363 EXT4_INODE_SYNC
= 3, /* Synchronous updates */
364 EXT4_INODE_IMMUTABLE
= 4, /* Immutable file */
365 EXT4_INODE_APPEND
= 5, /* writes to file may only append */
366 EXT4_INODE_NODUMP
= 6, /* do not dump file */
367 EXT4_INODE_NOATIME
= 7, /* do not update atime */
368 /* Reserved for compression usage... */
369 EXT4_INODE_DIRTY
= 8,
370 EXT4_INODE_COMPRBLK
= 9, /* One or more compressed clusters */
371 EXT4_INODE_NOCOMPR
= 10, /* Don't compress */
372 EXT4_INODE_ECOMPR
= 11, /* Compression error */
373 /* End compression flags --- maybe not all used */
374 EXT4_INODE_INDEX
= 12, /* hash-indexed directory */
375 EXT4_INODE_IMAGIC
= 13, /* AFS directory */
376 EXT4_INODE_JOURNAL_DATA
= 14, /* file data should be journaled */
377 EXT4_INODE_NOTAIL
= 15, /* file tail should not be merged */
378 EXT4_INODE_DIRSYNC
= 16, /* dirsync behaviour (directories only) */
379 EXT4_INODE_TOPDIR
= 17, /* Top of directory hierarchies*/
380 EXT4_INODE_HUGE_FILE
= 18, /* Set to each huge file */
381 EXT4_INODE_EXTENTS
= 19, /* Inode uses extents */
382 EXT4_INODE_EA_INODE
= 21, /* Inode used for large EA */
383 EXT4_INODE_EOFBLOCKS
= 22, /* Blocks allocated beyond EOF */
384 EXT4_INODE_RESERVED
= 31, /* reserved for ext4 lib */
387 #define TEST_FLAG_VALUE(FLAG) (EXT4_##FLAG##_FL == (1 << EXT4_INODE_##FLAG))
388 #define CHECK_FLAG_VALUE(FLAG) if (!TEST_FLAG_VALUE(FLAG)) { \
389 printk(KERN_EMERG "EXT4 flag fail: " #FLAG ": %d %d\n", \
390 EXT4_##FLAG##_FL, EXT4_INODE_##FLAG); BUG_ON(1); }
393 * Since it's pretty easy to mix up bit numbers and hex values, and we
394 * can't do a compile-time test for ENUM values, we use a run-time
395 * test to make sure that EXT4_XXX_FL is consistent with respect to
396 * EXT4_INODE_XXX. If all is well the printk and BUG_ON will all drop
397 * out so it won't cost any extra space in the compiled kernel image.
398 * But it's important that these values are the same, since we are
399 * using EXT4_INODE_XXX to test for the flag values, but EXT4_XX_FL
400 * must be consistent with the values of FS_XXX_FL defined in
401 * include/linux/fs.h and the on-disk values found in ext2, ext3, and
402 * ext4 filesystems, and of course the values defined in e2fsprogs.
404 * It's not paranoia if the Murphy's Law really *is* out to get you. :-)
406 static inline void ext4_check_flag_values(void)
408 CHECK_FLAG_VALUE(SECRM
);
409 CHECK_FLAG_VALUE(UNRM
);
410 CHECK_FLAG_VALUE(COMPR
);
411 CHECK_FLAG_VALUE(SYNC
);
412 CHECK_FLAG_VALUE(IMMUTABLE
);
413 CHECK_FLAG_VALUE(APPEND
);
414 CHECK_FLAG_VALUE(NODUMP
);
415 CHECK_FLAG_VALUE(NOATIME
);
416 CHECK_FLAG_VALUE(DIRTY
);
417 CHECK_FLAG_VALUE(COMPRBLK
);
418 CHECK_FLAG_VALUE(NOCOMPR
);
419 CHECK_FLAG_VALUE(ECOMPR
);
420 CHECK_FLAG_VALUE(INDEX
);
421 CHECK_FLAG_VALUE(IMAGIC
);
422 CHECK_FLAG_VALUE(JOURNAL_DATA
);
423 CHECK_FLAG_VALUE(NOTAIL
);
424 CHECK_FLAG_VALUE(DIRSYNC
);
425 CHECK_FLAG_VALUE(TOPDIR
);
426 CHECK_FLAG_VALUE(HUGE_FILE
);
427 CHECK_FLAG_VALUE(EXTENTS
);
428 CHECK_FLAG_VALUE(EA_INODE
);
429 CHECK_FLAG_VALUE(EOFBLOCKS
);
430 CHECK_FLAG_VALUE(RESERVED
);
433 /* Used to pass group descriptor data when online resize is done */
434 struct ext4_new_group_input
{
435 __u32 group
; /* Group number for this data */
436 __u64 block_bitmap
; /* Absolute block number of block bitmap */
437 __u64 inode_bitmap
; /* Absolute block number of inode bitmap */
438 __u64 inode_table
; /* Absolute block number of inode table start */
439 __u32 blocks_count
; /* Total number of blocks in this group */
440 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
444 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
445 struct compat_ext4_new_group_input
{
447 compat_u64 block_bitmap
;
448 compat_u64 inode_bitmap
;
449 compat_u64 inode_table
;
456 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
457 struct ext4_new_group_data
{
463 __u16 reserved_blocks
;
465 __u32 free_blocks_count
;
469 * Flags used by ext4_map_blocks()
471 /* Allocate any needed blocks and/or convert an unitialized
472 extent to be an initialized ext4 */
473 #define EXT4_GET_BLOCKS_CREATE 0x0001
474 /* Request the creation of an unitialized extent */
475 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
476 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
477 EXT4_GET_BLOCKS_CREATE)
478 /* Caller is from the delayed allocation writeout path,
479 so set the magic i_delalloc_reserve_flag after taking the
480 inode allocation semaphore for */
481 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
482 /* caller is from the direct IO path, request to creation of an
483 unitialized extents if not allocated, split the uninitialized
484 extent if blocks has been preallocated already*/
485 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
486 #define EXT4_GET_BLOCKS_CONVERT 0x0010
487 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
488 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
489 /* Convert extent to initialized after IO complete */
490 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
491 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
494 * Flags used by ext4_free_blocks
496 #define EXT4_FREE_BLOCKS_METADATA 0x0001
497 #define EXT4_FREE_BLOCKS_FORGET 0x0002
498 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
503 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
504 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
505 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
506 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
507 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
508 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
509 #ifdef CONFIG_JBD2_DEBUG
510 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
512 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
513 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
514 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
515 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
516 #define EXT4_IOC_MIGRATE _IO('f', 9)
517 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
518 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
519 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
520 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
522 #if defined(__KERNEL__) && defined(CONFIG_COMPAT)
524 * ioctl commands in 32 bit emulation
526 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
527 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
528 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
529 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
530 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
531 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
532 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
533 #define EXT4_IOC32_GROUP_ADD _IOW('f', 8, struct compat_ext4_new_group_input)
534 #ifdef CONFIG_JBD2_DEBUG
535 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
537 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
538 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
545 struct ext4_mount_options
{
546 unsigned long s_mount_opt
;
549 unsigned long s_commit_interval
;
550 u32 s_min_batch_time
, s_max_batch_time
;
553 char *s_qf_names
[MAXQUOTAS
];
557 /* Max physical block we can addres w/o extents */
558 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
561 * Structure of an inode on the disk
564 __le16 i_mode
; /* File mode */
565 __le16 i_uid
; /* Low 16 bits of Owner Uid */
566 __le32 i_size_lo
; /* Size in bytes */
567 __le32 i_atime
; /* Access time */
568 __le32 i_ctime
; /* Inode Change time */
569 __le32 i_mtime
; /* Modification time */
570 __le32 i_dtime
; /* Deletion Time */
571 __le16 i_gid
; /* Low 16 bits of Group Id */
572 __le16 i_links_count
; /* Links count */
573 __le32 i_blocks_lo
; /* Blocks count */
574 __le32 i_flags
; /* File flags */
580 __u32 h_i_translator
;
585 } osd1
; /* OS dependent 1 */
586 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
587 __le32 i_generation
; /* File version (for NFS) */
588 __le32 i_file_acl_lo
; /* File ACL */
590 __le32 i_obso_faddr
; /* Obsoleted fragment address */
593 __le16 l_i_blocks_high
; /* were l_i_reserved1 */
594 __le16 l_i_file_acl_high
;
595 __le16 l_i_uid_high
; /* these 2 fields */
596 __le16 l_i_gid_high
; /* were reserved2[0] */
600 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
607 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
608 __le16 m_i_file_acl_high
;
609 __u32 m_i_reserved2
[2];
611 } osd2
; /* OS dependent 2 */
612 __le16 i_extra_isize
;
614 __le32 i_ctime_extra
; /* extra Change time (nsec << 2 | epoch) */
615 __le32 i_mtime_extra
; /* extra Modification time(nsec << 2 | epoch) */
616 __le32 i_atime_extra
; /* extra Access time (nsec << 2 | epoch) */
617 __le32 i_crtime
; /* File Creation time */
618 __le32 i_crtime_extra
; /* extra FileCreationtime (nsec << 2 | epoch) */
619 __le32 i_version_hi
; /* high 32 bits for 64-bit version */
623 __u32 reserved
; /* should be zero */
624 __u32 donor_fd
; /* donor file descriptor */
625 __u64 orig_start
; /* logical start offset in block for orig */
626 __u64 donor_start
; /* logical start offset in block for donor */
627 __u64 len
; /* block length to be moved */
628 __u64 moved_len
; /* moved block length */
631 #define EXT4_EPOCH_BITS 2
632 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
633 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
636 * Extended fields will fit into an inode if the filesystem was formatted
637 * with large inodes (-I 256 or larger) and there are not currently any EAs
638 * consuming all of the available space. For new inodes we always reserve
639 * enough space for the kernel's known extended fields, but for inodes
640 * created with an old kernel this might not have been the case. None of
641 * the extended inode fields is critical for correct filesystem operation.
642 * This macro checks if a certain field fits in the inode. Note that
643 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
645 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
646 ((offsetof(typeof(*ext4_inode), field) + \
647 sizeof((ext4_inode)->field)) \
648 <= (EXT4_GOOD_OLD_INODE_SIZE + \
649 (einode)->i_extra_isize)) \
651 static inline __le32 ext4_encode_extra_time(struct timespec *time)
653 return cpu_to_le32((sizeof(time
->tv_sec
) > 4 ?
654 (time
->tv_sec
>> 32) & EXT4_EPOCH_MASK
: 0) |
655 ((time
->tv_nsec
<< EXT4_EPOCH_BITS
) & EXT4_NSEC_MASK
));
658 static inline void ext4_decode_extra_time(struct timespec
*time
, __le32 extra
)
660 if (sizeof(time
->tv_sec
) > 4)
661 time
->tv_sec
|= (__u64
)(le32_to_cpu(extra
) & EXT4_EPOCH_MASK
)
663 time
->tv_nsec
= (le32_to_cpu(extra
) & EXT4_NSEC_MASK
) >> EXT4_EPOCH_BITS
;
666 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
668 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
669 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
670 (raw_inode)->xtime ## _extra = \
671 ext4_encode_extra_time(&(inode)->xtime); \
674 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
676 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
677 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
678 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
679 (raw_inode)->xtime ## _extra = \
680 ext4_encode_extra_time(&(einode)->xtime); \
683 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
685 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
686 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
687 ext4_decode_extra_time(&(inode)->xtime, \
688 raw_inode->xtime ## _extra); \
691 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
693 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
694 (einode)->xtime.tv_sec = \
695 (signed)le32_to_cpu((raw_inode)->xtime); \
696 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
697 ext4_decode_extra_time(&(einode)->xtime, \
698 raw_inode->xtime ## _extra); \
701 #define i_disk_version osd1.linux1.l_i_version
703 #if defined(__KERNEL__) || defined(__linux__)
704 #define i_reserved1 osd1.linux1.l_i_reserved1
705 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
706 #define i_blocks_high osd2.linux2.l_i_blocks_high
707 #define i_uid_low i_uid
708 #define i_gid_low i_gid
709 #define i_uid_high osd2.linux2.l_i_uid_high
710 #define i_gid_high osd2.linux2.l_i_gid_high
711 #define i_reserved2 osd2.linux2.l_i_reserved2
713 #elif defined(__GNU__)
715 #define i_translator osd1.hurd1.h_i_translator
716 #define i_uid_high osd2.hurd2.h_i_uid_high
717 #define i_gid_high osd2.hurd2.h_i_gid_high
718 #define i_author osd2.hurd2.h_i_author
720 #elif defined(__masix__)
722 #define i_reserved1 osd1.masix1.m_i_reserved1
723 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
724 #define i_reserved2 osd2.masix2.m_i_reserved2
726 #endif /* defined(__KERNEL__) || defined(__linux__) */
729 * storage for cached extent
731 struct ext4_ext_cache
{
732 ext4_fsblk_t ec_start
;
733 ext4_lblk_t ec_block
;
734 __u32 ec_len
; /* must be 32bit to return holes */
739 * fourth extended file system inode data in memory
741 struct ext4_inode_info
{
742 __le32 i_data
[15]; /* unconverted */
744 ext4_fsblk_t i_file_acl
;
747 * i_block_group is the number of the block group which contains
748 * this file's inode. Constant across the lifetime of the inode,
749 * it is ued for making block allocation decisions - we try to
750 * place a file's data blocks near its inode block, and new inodes
751 * near to their parent directory's inode.
753 ext4_group_t i_block_group
;
754 unsigned long i_state_flags
; /* Dynamic state flags */
755 unsigned long i_flags
;
757 ext4_lblk_t i_dir_start_lookup
;
758 #ifdef CONFIG_EXT4_FS_XATTR
760 * Extended attributes can be read independently of the main file
761 * data. Taking i_mutex even when reading would cause contention
762 * between readers of EAs and writers of regular file data, so
763 * instead we synchronize on xattr_sem when reading or changing
766 struct rw_semaphore xattr_sem
;
769 struct list_head i_orphan
; /* unlinked but open inodes */
772 * i_disksize keeps track of what the inode size is ON DISK, not
773 * in memory. During truncate, i_size is set to the new size by
774 * the VFS prior to calling ext4_truncate(), but the filesystem won't
775 * set i_disksize to 0 until the truncate is actually under way.
777 * The intent is that i_disksize always represents the blocks which
778 * are used by this file. This allows recovery to restart truncate
779 * on orphans if we crash during truncate. We actually write i_disksize
780 * into the on-disk inode when writing inodes out, instead of i_size.
782 * The only time when i_disksize and i_size may be different is when
783 * a truncate is in progress. The only things which change i_disksize
784 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
789 * i_data_sem is for serialising ext4_truncate() against
790 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
791 * data tree are chopped off during truncate. We can't do that in
792 * ext4 because whenever we perform intermediate commits during
793 * truncate, the inode and all the metadata blocks *must* be in a
794 * consistent state which allows truncation of the orphans to restart
795 * during recovery. Hence we must fix the get_block-vs-truncate race
796 * by other means, so we have i_data_sem.
798 struct rw_semaphore i_data_sem
;
799 struct inode vfs_inode
;
800 struct jbd2_inode jinode
;
802 struct ext4_ext_cache i_cached_extent
;
804 * File creation time. Its function is same as that of
805 * struct timespec i_{a,c,m}time in the generic inode.
807 struct timespec i_crtime
;
810 struct list_head i_prealloc_list
;
811 spinlock_t i_prealloc_lock
;
814 ext4_group_t i_last_alloc_group
;
816 /* allocation reservation info for delalloc */
817 unsigned int i_reserved_data_blocks
;
818 unsigned int i_reserved_meta_blocks
;
819 unsigned int i_allocated_meta_blocks
;
820 unsigned short i_delalloc_reserved_flag
;
821 sector_t i_da_metadata_calc_last_lblock
;
822 int i_da_metadata_calc_len
;
824 /* on-disk additional length */
827 spinlock_t i_block_reservation_lock
;
829 /* quota space reservation, managed internally by quota code */
830 qsize_t i_reserved_quota
;
833 /* completed IOs that might need unwritten extents handling */
834 struct list_head i_completed_io_list
;
835 spinlock_t i_completed_io_lock
;
836 /* current io_end structure for async DIO write*/
837 ext4_io_end_t
*cur_aio_dio
;
840 * Transactions that contain inode's metadata needed to complete
841 * fsync and fdatasync, respectively.
844 tid_t i_datasync_tid
;
850 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
851 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
852 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
855 * Misc. filesystem flags
857 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
858 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
859 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
864 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
865 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
866 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
867 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
868 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
869 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
870 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
871 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
872 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
873 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
874 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
875 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
876 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
877 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
878 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
879 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
880 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
881 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
882 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
883 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
884 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
885 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
886 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
887 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
888 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
889 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
890 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
891 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
892 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
893 #define EXT4_MOUNT_INIT_INODE_TABLE 0x80000000 /* Initialize uninitialized itables */
895 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
896 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
897 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
900 #define ext4_set_bit ext2_set_bit
901 #define ext4_set_bit_atomic ext2_set_bit_atomic
902 #define ext4_clear_bit ext2_clear_bit
903 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
904 #define ext4_test_bit ext2_test_bit
905 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
906 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
907 #define ext4_find_next_bit ext2_find_next_bit
910 * Maximal mount counts between two filesystem checks
912 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
913 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
916 * Behaviour when detecting errors
918 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
919 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
920 #define EXT4_ERRORS_PANIC 3 /* Panic */
921 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
924 * Structure of the super block
926 struct ext4_super_block
{
927 /*00*/ __le32 s_inodes_count
; /* Inodes count */
928 __le32 s_blocks_count_lo
; /* Blocks count */
929 __le32 s_r_blocks_count_lo
; /* Reserved blocks count */
930 __le32 s_free_blocks_count_lo
; /* Free blocks count */
931 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
932 __le32 s_first_data_block
; /* First Data Block */
933 __le32 s_log_block_size
; /* Block size */
934 __le32 s_obso_log_frag_size
; /* Obsoleted fragment size */
935 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
936 __le32 s_obso_frags_per_group
; /* Obsoleted fragments per group */
937 __le32 s_inodes_per_group
; /* # Inodes per group */
938 __le32 s_mtime
; /* Mount time */
939 /*30*/ __le32 s_wtime
; /* Write time */
940 __le16 s_mnt_count
; /* Mount count */
941 __le16 s_max_mnt_count
; /* Maximal mount count */
942 __le16 s_magic
; /* Magic signature */
943 __le16 s_state
; /* File system state */
944 __le16 s_errors
; /* Behaviour when detecting errors */
945 __le16 s_minor_rev_level
; /* minor revision level */
946 /*40*/ __le32 s_lastcheck
; /* time of last check */
947 __le32 s_checkinterval
; /* max. time between checks */
948 __le32 s_creator_os
; /* OS */
949 __le32 s_rev_level
; /* Revision level */
950 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
951 __le16 s_def_resgid
; /* Default gid for reserved blocks */
953 * These fields are for EXT4_DYNAMIC_REV superblocks only.
955 * Note: the difference between the compatible feature set and
956 * the incompatible feature set is that if there is a bit set
957 * in the incompatible feature set that the kernel doesn't
958 * know about, it should refuse to mount the filesystem.
960 * e2fsck's requirements are more strict; if it doesn't know
961 * about a feature in either the compatible or incompatible
962 * feature set, it must abort and not try to meddle with
963 * things it doesn't understand...
965 __le32 s_first_ino
; /* First non-reserved inode */
966 __le16 s_inode_size
; /* size of inode structure */
967 __le16 s_block_group_nr
; /* block group # of this superblock */
968 __le32 s_feature_compat
; /* compatible feature set */
969 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
970 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
971 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
972 /*78*/ char s_volume_name
[16]; /* volume name */
973 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
974 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
976 * Performance hints. Directory preallocation should only
977 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
979 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
980 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
981 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
983 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
985 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
986 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
987 __le32 s_journal_dev
; /* device number of journal file */
988 __le32 s_last_orphan
; /* start of list of inodes to delete */
989 __le32 s_hash_seed
[4]; /* HTREE hash seed */
990 __u8 s_def_hash_version
; /* Default hash version to use */
991 __u8 s_jnl_backup_type
;
992 __le16 s_desc_size
; /* size of group descriptor */
993 /*100*/ __le32 s_default_mount_opts
;
994 __le32 s_first_meta_bg
; /* First metablock block group */
995 __le32 s_mkfs_time
; /* When the filesystem was created */
996 __le32 s_jnl_blocks
[17]; /* Backup of the journal inode */
997 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
998 /*150*/ __le32 s_blocks_count_hi
; /* Blocks count */
999 __le32 s_r_blocks_count_hi
; /* Reserved blocks count */
1000 __le32 s_free_blocks_count_hi
; /* Free blocks count */
1001 __le16 s_min_extra_isize
; /* All inodes have at least # bytes */
1002 __le16 s_want_extra_isize
; /* New inodes should reserve # bytes */
1003 __le32 s_flags
; /* Miscellaneous flags */
1004 __le16 s_raid_stride
; /* RAID stride */
1005 __le16 s_mmp_interval
; /* # seconds to wait in MMP checking */
1006 __le64 s_mmp_block
; /* Block for multi-mount protection */
1007 __le32 s_raid_stripe_width
; /* blocks on all data disks (N*stride)*/
1008 __u8 s_log_groups_per_flex
; /* FLEX_BG group size */
1009 __u8 s_reserved_char_pad
;
1010 __le16 s_reserved_pad
;
1011 __le64 s_kbytes_written
; /* nr of lifetime kilobytes written */
1012 __le32 s_snapshot_inum
; /* Inode number of active snapshot */
1013 __le32 s_snapshot_id
; /* sequential ID of active snapshot */
1014 __le64 s_snapshot_r_blocks_count
; /* reserved blocks for active
1015 snapshot's future use */
1016 __le32 s_snapshot_list
; /* inode number of the head of the
1017 on-disk snapshot list */
1018 #define EXT4_S_ERR_START offsetof(struct ext4_super_block, s_error_count)
1019 __le32 s_error_count
; /* number of fs errors */
1020 __le32 s_first_error_time
; /* first time an error happened */
1021 __le32 s_first_error_ino
; /* inode involved in first error */
1022 __le64 s_first_error_block
; /* block involved of first error */
1023 __u8 s_first_error_func
[32]; /* function where the error happened */
1024 __le32 s_first_error_line
; /* line number where error happened */
1025 __le32 s_last_error_time
; /* most recent time of an error */
1026 __le32 s_last_error_ino
; /* inode involved in last error */
1027 __le32 s_last_error_line
; /* line number where error happened */
1028 __le64 s_last_error_block
; /* block involved of last error */
1029 __u8 s_last_error_func
[32]; /* function where the error happened */
1030 #define EXT4_S_ERR_END offsetof(struct ext4_super_block, s_mount_opts)
1031 __u8 s_mount_opts
[64];
1032 __le32 s_reserved
[112]; /* Padding to the end of the block */
1035 #define EXT4_S_ERR_LEN (EXT4_S_ERR_END - EXT4_S_ERR_START)
1040 * run-time mount flags
1042 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
1043 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
1046 * fourth extended-fs super-block data in memory
1048 struct ext4_sb_info
{
1049 unsigned long s_desc_size
; /* Size of a group descriptor in bytes */
1050 unsigned long s_inodes_per_block
;/* Number of inodes per block */
1051 unsigned long s_blocks_per_group
;/* Number of blocks in a group */
1052 unsigned long s_inodes_per_group
;/* Number of inodes in a group */
1053 unsigned long s_itb_per_group
; /* Number of inode table blocks per group */
1054 unsigned long s_gdb_count
; /* Number of group descriptor blocks */
1055 unsigned long s_desc_per_block
; /* Number of group descriptors per block */
1056 ext4_group_t s_groups_count
; /* Number of groups in the fs */
1057 ext4_group_t s_blockfile_groups
;/* Groups acceptable for non-extent files */
1058 unsigned long s_overhead_last
; /* Last calculated overhead */
1059 unsigned long s_blocks_last
; /* Last seen block count */
1060 loff_t s_bitmap_maxbytes
; /* max bytes for bitmap files */
1061 struct buffer_head
* s_sbh
; /* Buffer containing the super block */
1062 struct ext4_super_block
*s_es
; /* Pointer to the super block in the buffer */
1063 struct buffer_head
**s_group_desc
;
1064 unsigned int s_mount_opt
;
1065 unsigned int s_mount_flags
;
1066 ext4_fsblk_t s_sb_block
;
1069 unsigned short s_mount_state
;
1070 unsigned short s_pad
;
1071 int s_addr_per_block_bits
;
1072 int s_desc_per_block_bits
;
1075 unsigned int s_inode_readahead_blks
;
1076 unsigned int s_inode_goal
;
1077 spinlock_t s_next_gen_lock
;
1078 u32 s_next_generation
;
1080 int s_def_hash_version
;
1081 int s_hash_unsigned
; /* 3 if hash should be signed, 0 if not */
1082 struct percpu_counter s_freeblocks_counter
;
1083 struct percpu_counter s_freeinodes_counter
;
1084 struct percpu_counter s_dirs_counter
;
1085 struct percpu_counter s_dirtyblocks_counter
;
1086 struct blockgroup_lock
*s_blockgroup_lock
;
1087 struct proc_dir_entry
*s_proc
;
1088 struct kobject s_kobj
;
1089 struct completion s_kobj_unregister
;
1092 struct journal_s
*s_journal
;
1093 struct list_head s_orphan
;
1094 struct mutex s_orphan_lock
;
1095 struct mutex s_resize_lock
;
1096 unsigned long s_commit_interval
;
1097 u32 s_max_batch_time
;
1098 u32 s_min_batch_time
;
1099 struct block_device
*journal_bdev
;
1100 #ifdef CONFIG_JBD2_DEBUG
1101 struct timer_list turn_ro_timer
; /* For turning read-only (crash simulation) */
1102 wait_queue_head_t ro_wait_queue
; /* For people waiting for the fs to go read-only */
1105 char *s_qf_names
[MAXQUOTAS
]; /* Names of quota files with journalled quota */
1106 int s_jquota_fmt
; /* Format of quota to use */
1108 unsigned int s_want_extra_isize
; /* New inodes should reserve # bytes */
1109 struct rb_root system_blks
;
1111 #ifdef EXTENTS_STATS
1112 /* ext4 extents stats */
1113 unsigned long s_ext_min
;
1114 unsigned long s_ext_max
;
1115 unsigned long s_depth_max
;
1116 spinlock_t s_ext_stats_lock
;
1117 unsigned long s_ext_blocks
;
1118 unsigned long s_ext_extents
;
1121 /* for buddy allocator */
1122 struct ext4_group_info
***s_group_info
;
1123 struct inode
*s_buddy_cache
;
1124 spinlock_t s_md_lock
;
1125 unsigned short *s_mb_offsets
;
1126 unsigned int *s_mb_maxs
;
1129 unsigned long s_stripe
;
1130 unsigned int s_mb_stream_request
;
1131 unsigned int s_mb_max_to_scan
;
1132 unsigned int s_mb_min_to_scan
;
1133 unsigned int s_mb_stats
;
1134 unsigned int s_mb_order2_reqs
;
1135 unsigned int s_mb_group_prealloc
;
1136 unsigned int s_max_writeback_mb_bump
;
1137 /* where last allocation was done - for stream allocation */
1138 unsigned long s_mb_last_group
;
1139 unsigned long s_mb_last_start
;
1141 /* stats for buddy allocator */
1142 atomic_t s_bal_reqs
; /* number of reqs with len > 1 */
1143 atomic_t s_bal_success
; /* we found long enough chunks */
1144 atomic_t s_bal_allocated
; /* in blocks */
1145 atomic_t s_bal_ex_scanned
; /* total extents scanned */
1146 atomic_t s_bal_goals
; /* goal hits */
1147 atomic_t s_bal_breaks
; /* too long searches */
1148 atomic_t s_bal_2orders
; /* 2^order hits */
1149 spinlock_t s_bal_lock
;
1150 unsigned long s_mb_buddies_generated
;
1151 unsigned long long s_mb_generation_time
;
1152 atomic_t s_mb_lost_chunks
;
1153 atomic_t s_mb_preallocated
;
1154 atomic_t s_mb_discarded
;
1155 atomic_t s_lock_busy
;
1157 /* locality groups */
1158 struct ext4_locality_group __percpu
*s_locality_groups
;
1160 /* for write statistics */
1161 unsigned long s_sectors_written_start
;
1162 u64 s_kbytes_written
;
1164 unsigned int s_log_groups_per_flex
;
1165 struct flex_groups
*s_flex_groups
;
1167 /* workqueue for dio unwritten */
1168 struct workqueue_struct
*dio_unwritten_wq
;
1170 /* timer for periodic error stats printing */
1171 struct timer_list s_err_report
;
1173 /* Lazy inode table initialization info */
1174 struct ext4_li_request
*s_li_request
;
1175 /* Wait multiplier for lazy initialization thread */
1176 unsigned int s_li_wait_mult
;
1179 static inline struct ext4_sb_info
*EXT4_SB(struct super_block
*sb
)
1181 return sb
->s_fs_info
;
1183 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
1185 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
1188 static inline struct timespec
ext4_current_time(struct inode
*inode
)
1190 return (inode
->i_sb
->s_time_gran
< NSEC_PER_SEC
) ?
1191 current_fs_time(inode
->i_sb
) : CURRENT_TIME_SEC
;
1194 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
1196 return ino
== EXT4_ROOT_INO
||
1197 ino
== EXT4_JOURNAL_INO
||
1198 ino
== EXT4_RESIZE_INO
||
1199 (ino
>= EXT4_FIRST_INO(sb
) &&
1200 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
1204 * Inode dynamic state flags
1207 EXT4_STATE_JDATA
, /* journaled data exists */
1208 EXT4_STATE_NEW
, /* inode is newly created */
1209 EXT4_STATE_XATTR
, /* has in-inode xattrs */
1210 EXT4_STATE_NO_EXPAND
, /* No space for expansion */
1211 EXT4_STATE_DA_ALLOC_CLOSE
, /* Alloc DA blks on close */
1212 EXT4_STATE_EXT_MIGRATE
, /* Inode is migrating */
1213 EXT4_STATE_DIO_UNWRITTEN
, /* need convert on dio done*/
1214 EXT4_STATE_NEWENTRY
, /* File just added to dir */
1217 #define EXT4_INODE_BIT_FNS(name, field) \
1218 static inline int ext4_test_inode_##name(struct inode *inode, int bit) \
1220 return test_bit(bit, &EXT4_I(inode)->i_##field); \
1222 static inline void ext4_set_inode_##name(struct inode *inode, int bit) \
1224 set_bit(bit, &EXT4_I(inode)->i_##field); \
1226 static inline void ext4_clear_inode_##name(struct inode *inode, int bit) \
1228 clear_bit(bit, &EXT4_I(inode)->i_##field); \
1231 EXT4_INODE_BIT_FNS(flag
, flags
)
1232 EXT4_INODE_BIT_FNS(state
, state_flags
)
1234 /* Assume that user mode programs are passing in an ext4fs superblock, not
1235 * a kernel struct super_block. This will allow us to call the feature-test
1236 * macros from user land. */
1237 #define EXT4_SB(sb) (sb)
1240 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1243 * Codes for operating systems
1245 #define EXT4_OS_LINUX 0
1246 #define EXT4_OS_HURD 1
1247 #define EXT4_OS_MASIX 2
1248 #define EXT4_OS_FREEBSD 3
1249 #define EXT4_OS_LITES 4
1254 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1255 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1257 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1258 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1260 #define EXT4_GOOD_OLD_INODE_SIZE 128
1263 * Feature set definitions
1266 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1267 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1268 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1269 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1270 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1271 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1272 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1273 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1274 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1275 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1276 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1277 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1278 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1279 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1280 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1281 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1282 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1283 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1285 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1286 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1287 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1288 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1289 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1290 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1292 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1293 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1294 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1295 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1296 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1297 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1298 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1300 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1301 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1302 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1303 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1304 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1305 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1306 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1307 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1308 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1309 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1310 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1312 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1313 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1314 EXT4_FEATURE_INCOMPAT_RECOVER| \
1315 EXT4_FEATURE_INCOMPAT_META_BG| \
1316 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1317 EXT4_FEATURE_INCOMPAT_64BIT| \
1318 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1319 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1320 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1321 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1322 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1323 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1324 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1325 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1328 * Default values for user and/or group using reserved blocks
1330 #define EXT4_DEF_RESUID 0
1331 #define EXT4_DEF_RESGID 0
1333 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1336 * Default mount options
1338 #define EXT4_DEFM_DEBUG 0x0001
1339 #define EXT4_DEFM_BSDGROUPS 0x0002
1340 #define EXT4_DEFM_XATTR_USER 0x0004
1341 #define EXT4_DEFM_ACL 0x0008
1342 #define EXT4_DEFM_UID16 0x0010
1343 #define EXT4_DEFM_JMODE 0x0060
1344 #define EXT4_DEFM_JMODE_DATA 0x0020
1345 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1346 #define EXT4_DEFM_JMODE_WBACK 0x0060
1347 #define EXT4_DEFM_NOBARRIER 0x0100
1348 #define EXT4_DEFM_BLOCK_VALIDITY 0x0200
1349 #define EXT4_DEFM_DISCARD 0x0400
1350 #define EXT4_DEFM_NODELALLOC 0x0800
1353 * Default journal batch times
1355 #define EXT4_DEF_MIN_BATCH_TIME 0
1356 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1359 * Minimum number of groups in a flexgroup before we separate out
1360 * directories into the first block group of a flexgroup
1362 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1365 * Structure of a directory entry
1367 #define EXT4_NAME_LEN 255
1369 struct ext4_dir_entry
{
1370 __le32 inode
; /* Inode number */
1371 __le16 rec_len
; /* Directory entry length */
1372 __le16 name_len
; /* Name length */
1373 char name
[EXT4_NAME_LEN
]; /* File name */
1377 * The new version of the directory entry. Since EXT4 structures are
1378 * stored in intel byte order, and the name_len field could never be
1379 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1382 struct ext4_dir_entry_2
{
1383 __le32 inode
; /* Inode number */
1384 __le16 rec_len
; /* Directory entry length */
1385 __u8 name_len
; /* Name length */
1387 char name
[EXT4_NAME_LEN
]; /* File name */
1391 * Ext4 directory file types. Only the low 3 bits are used. The
1392 * other bits are reserved for now.
1394 #define EXT4_FT_UNKNOWN 0
1395 #define EXT4_FT_REG_FILE 1
1396 #define EXT4_FT_DIR 2
1397 #define EXT4_FT_CHRDEV 3
1398 #define EXT4_FT_BLKDEV 4
1399 #define EXT4_FT_FIFO 5
1400 #define EXT4_FT_SOCK 6
1401 #define EXT4_FT_SYMLINK 7
1403 #define EXT4_FT_MAX 8
1406 * EXT4_DIR_PAD defines the directory entries boundaries
1408 * NOTE: It must be a multiple of 4
1410 #define EXT4_DIR_PAD 4
1411 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1412 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1414 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1417 * If we ever get support for fs block sizes > page_size, we'll need
1418 * to remove the #if statements in the next two functions...
1420 static inline unsigned int
1421 ext4_rec_len_from_disk(__le16 dlen
, unsigned blocksize
)
1423 unsigned len
= le16_to_cpu(dlen
);
1425 #if (PAGE_CACHE_SIZE >= 65536)
1426 if (len
== EXT4_MAX_REC_LEN
|| len
== 0)
1428 return (len
& 65532) | ((len
& 3) << 16);
1434 static inline __le16
ext4_rec_len_to_disk(unsigned len
, unsigned blocksize
)
1436 if ((len
> blocksize
) || (blocksize
> (1 << 18)) || (len
& 3))
1438 #if (PAGE_CACHE_SIZE >= 65536)
1440 return cpu_to_le16(len
);
1441 if (len
== blocksize
) {
1442 if (blocksize
== 65536)
1443 return cpu_to_le16(EXT4_MAX_REC_LEN
);
1445 return cpu_to_le16(0);
1447 return cpu_to_le16((len
& 65532) | ((len
>> 16) & 3));
1449 return cpu_to_le16(len
);
1454 * Hash Tree Directory indexing
1455 * (c) Daniel Phillips, 2001
1458 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1459 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1460 ext4_test_inode_flag((dir), EXT4_INODE_INDEX))
1461 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1462 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1464 /* Legal values for the dx_root hash_version field: */
1466 #define DX_HASH_LEGACY 0
1467 #define DX_HASH_HALF_MD4 1
1468 #define DX_HASH_TEA 2
1469 #define DX_HASH_LEGACY_UNSIGNED 3
1470 #define DX_HASH_HALF_MD4_UNSIGNED 4
1471 #define DX_HASH_TEA_UNSIGNED 5
1475 /* hash info structure used by the directory hash */
1484 #define EXT4_HTREE_EOF 0x7fffffff
1487 * Control parameters used by ext4_htree_next_block
1489 #define HASH_NB_ALWAYS 1
1493 * Describe an inode's exact location on disk and in memory
1497 struct buffer_head
*bh
;
1498 unsigned long offset
;
1499 ext4_group_t block_group
;
1502 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
1504 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
1508 * This structure is stuffed into the struct file's private_data field
1509 * for directories. It is where we put information so that we can do
1510 * readdir operations in hash tree order.
1512 struct dir_private_info
{
1513 struct rb_root root
;
1514 struct rb_node
*curr_node
;
1515 struct fname
*extra_fname
;
1518 __u32 curr_minor_hash
;
1522 /* calculate the first block number of the group */
1523 static inline ext4_fsblk_t
1524 ext4_group_first_block_no(struct super_block
*sb
, ext4_group_t group_no
)
1526 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
1527 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
1531 * Special error return code only used by dx_probe() and its callers.
1533 #define ERR_BAD_DX_DIR -75000
1535 void ext4_get_group_no_and_offset(struct super_block
*sb
, ext4_fsblk_t blocknr
,
1536 ext4_group_t
*blockgrpp
, ext4_grpblk_t
*offsetp
);
1538 extern struct proc_dir_entry
*ext4_proc_root
;
1541 * Timeout and state flag for lazy initialization inode thread.
1543 #define EXT4_DEF_LI_WAIT_MULT 10
1544 #define EXT4_DEF_LI_MAX_START_DELAY 5
1545 #define EXT4_LAZYINIT_QUIT 0x0001
1546 #define EXT4_LAZYINIT_RUNNING 0x0002
1549 * Lazy inode table initialization info
1551 struct ext4_lazy_init
{
1552 unsigned long li_state
;
1554 wait_queue_head_t li_wait_daemon
;
1555 wait_queue_head_t li_wait_task
;
1556 struct timer_list li_timer
;
1557 struct task_struct
*li_task
;
1559 struct list_head li_request_list
;
1560 struct mutex li_list_mtx
;
1563 struct ext4_li_request
{
1564 struct super_block
*lr_super
;
1565 struct ext4_sb_info
*lr_sbi
;
1566 ext4_group_t lr_next_group
;
1567 struct list_head lr_request
;
1568 unsigned long lr_next_sched
;
1569 unsigned long lr_timeout
;
1572 struct ext4_features
{
1573 struct kobject f_kobj
;
1574 struct completion f_kobj_unregister
;
1578 * Function prototypes
1582 * Ok, these declarations are also in <linux/kernel.h> but none of the
1583 * ext4 source programs needs to include it so they are duplicated here.
1585 # define NORET_TYPE /**/
1586 # define ATTRIB_NORET __attribute__((noreturn))
1587 # define NORET_AND noreturn,
1590 extern unsigned int ext4_count_free(struct buffer_head
*, unsigned);
1593 extern unsigned int ext4_block_group(struct super_block
*sb
,
1594 ext4_fsblk_t blocknr
);
1595 extern ext4_grpblk_t
ext4_block_group_offset(struct super_block
*sb
,
1596 ext4_fsblk_t blocknr
);
1597 extern int ext4_bg_has_super(struct super_block
*sb
, ext4_group_t group
);
1598 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
,
1599 ext4_group_t group
);
1600 extern ext4_fsblk_t
ext4_new_meta_blocks(handle_t
*handle
, struct inode
*inode
,
1601 ext4_fsblk_t goal
, unsigned long *count
, int *errp
);
1602 extern int ext4_claim_free_blocks(struct ext4_sb_info
*sbi
, s64 nblocks
);
1603 extern int ext4_has_free_blocks(struct ext4_sb_info
*sbi
, s64 nblocks
);
1604 extern void ext4_add_groupblocks(handle_t
*handle
, struct super_block
*sb
,
1605 ext4_fsblk_t block
, unsigned long count
);
1606 extern ext4_fsblk_t
ext4_count_free_blocks(struct super_block
*);
1607 extern void ext4_check_blocks_bitmap(struct super_block
*);
1608 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
1609 ext4_group_t block_group
,
1610 struct buffer_head
** bh
);
1611 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
1612 struct buffer_head
*ext4_read_block_bitmap(struct super_block
*sb
,
1613 ext4_group_t block_group
);
1614 extern unsigned ext4_init_block_bitmap(struct super_block
*sb
,
1615 struct buffer_head
*bh
,
1617 struct ext4_group_desc
*desc
);
1618 #define ext4_free_blocks_after_init(sb, group, desc) \
1619 ext4_init_block_bitmap(sb, NULL, group, desc)
1622 extern int __ext4_check_dir_entry(const char *, unsigned int, struct inode
*,
1623 struct ext4_dir_entry_2
*,
1624 struct buffer_head
*, unsigned int);
1625 #define ext4_check_dir_entry(dir, de, bh, offset) \
1626 __ext4_check_dir_entry(__func__, __LINE__, (dir), (de), (bh), (offset))
1627 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
1629 struct ext4_dir_entry_2
*dirent
);
1630 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
1633 extern int ext4_sync_file(struct file
*, int);
1636 extern int ext4fs_dirhash(const char *name
, int len
, struct
1637 dx_hash_info
*hinfo
);
1640 extern struct inode
*ext4_new_inode(handle_t
*, struct inode
*, int,
1641 const struct qstr
*qstr
, __u32 goal
);
1642 extern void ext4_free_inode(handle_t
*, struct inode
*);
1643 extern struct inode
* ext4_orphan_get(struct super_block
*, unsigned long);
1644 extern unsigned long ext4_count_free_inodes(struct super_block
*);
1645 extern unsigned long ext4_count_dirs(struct super_block
*);
1646 extern void ext4_check_inodes_bitmap(struct super_block
*);
1647 extern unsigned ext4_init_inode_bitmap(struct super_block
*sb
,
1648 struct buffer_head
*bh
,
1650 struct ext4_group_desc
*desc
);
1651 extern void mark_bitmap_end(int start_bit
, int end_bit
, char *bitmap
);
1652 extern int ext4_init_inode_table(struct super_block
*sb
,
1653 ext4_group_t group
, int barrier
);
1656 extern long ext4_mb_stats
;
1657 extern long ext4_mb_max_to_scan
;
1658 extern int ext4_mb_init(struct super_block
*, int);
1659 extern int ext4_mb_release(struct super_block
*);
1660 extern ext4_fsblk_t
ext4_mb_new_blocks(handle_t
*,
1661 struct ext4_allocation_request
*, int *);
1662 extern int ext4_mb_reserve_blocks(struct super_block
*, int);
1663 extern void ext4_discard_preallocations(struct inode
*);
1664 extern int __init
init_ext4_mballoc(void);
1665 extern void exit_ext4_mballoc(void);
1666 extern void ext4_free_blocks(handle_t
*handle
, struct inode
*inode
,
1667 struct buffer_head
*bh
, ext4_fsblk_t block
,
1668 unsigned long count
, int flags
);
1669 extern int ext4_mb_add_groupinfo(struct super_block
*sb
,
1670 ext4_group_t i
, struct ext4_group_desc
*desc
);
1671 extern int ext4_mb_get_buddy_cache_lock(struct super_block
*, ext4_group_t
);
1672 extern void ext4_mb_put_buddy_cache_lock(struct super_block
*,
1675 struct buffer_head
*ext4_getblk(handle_t
*, struct inode
*,
1676 ext4_lblk_t
, int, int *);
1677 struct buffer_head
*ext4_bread(handle_t
*, struct inode
*,
1678 ext4_lblk_t
, int, int *);
1679 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
1680 struct buffer_head
*bh_result
, int create
);
1682 extern struct inode
*ext4_iget(struct super_block
*, unsigned long);
1683 extern int ext4_write_inode(struct inode
*, struct writeback_control
*);
1684 extern int ext4_setattr(struct dentry
*, struct iattr
*);
1685 extern int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
1686 struct kstat
*stat
);
1687 extern void ext4_evict_inode(struct inode
*);
1688 extern void ext4_clear_inode(struct inode
*);
1689 extern int ext4_sync_inode(handle_t
*, struct inode
*);
1690 extern void ext4_dirty_inode(struct inode
*);
1691 extern int ext4_change_inode_journal_flag(struct inode
*, int);
1692 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
1693 extern int ext4_can_truncate(struct inode
*inode
);
1694 extern void ext4_truncate(struct inode
*);
1695 extern int ext4_truncate_restart_trans(handle_t
*, struct inode
*, int nblocks
);
1696 extern void ext4_set_inode_flags(struct inode
*);
1697 extern void ext4_get_inode_flags(struct ext4_inode_info
*);
1698 extern int ext4_alloc_da_blocks(struct inode
*inode
);
1699 extern void ext4_set_aops(struct inode
*inode
);
1700 extern int ext4_writepage_trans_blocks(struct inode
*);
1701 extern int ext4_meta_trans_blocks(struct inode
*, int nrblocks
, int idxblocks
);
1702 extern int ext4_chunk_trans_blocks(struct inode
*, int nrblocks
);
1703 extern int ext4_block_truncate_page(handle_t
*handle
,
1704 struct address_space
*mapping
, loff_t from
);
1705 extern int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct vm_fault
*vmf
);
1706 extern qsize_t
*ext4_get_reserved_space(struct inode
*inode
);
1707 extern int flush_completed_IO(struct inode
*inode
);
1708 extern void ext4_da_update_reserve_space(struct inode
*inode
,
1709 int used
, int quota_claim
);
1711 extern long ext4_ioctl(struct file
*, unsigned int, unsigned long);
1712 extern long ext4_compat_ioctl(struct file
*, unsigned int, unsigned long);
1715 extern int ext4_ext_migrate(struct inode
*);
1718 extern int ext4_orphan_add(handle_t
*, struct inode
*);
1719 extern int ext4_orphan_del(handle_t
*, struct inode
*);
1720 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
1721 __u32 start_minor_hash
, __u32
*next_hash
);
1724 extern int ext4_group_add(struct super_block
*sb
,
1725 struct ext4_new_group_data
*input
);
1726 extern int ext4_group_extend(struct super_block
*sb
,
1727 struct ext4_super_block
*es
,
1728 ext4_fsblk_t n_blocks_count
);
1731 extern void __ext4_error(struct super_block
*, const char *, unsigned int,
1733 __attribute__ ((format (printf
, 4, 5)));
1734 #define ext4_error(sb, message...) __ext4_error(sb, __func__, \
1735 __LINE__, ## message)
1736 extern void ext4_error_inode(struct inode
*, const char *, unsigned int,
1737 ext4_fsblk_t
, const char *, ...)
1738 __attribute__ ((format (printf
, 5, 6)));
1739 extern void ext4_error_file(struct file
*, const char *, unsigned int,
1741 __attribute__ ((format (printf
, 4, 5)));
1742 extern void __ext4_std_error(struct super_block
*, const char *,
1744 extern void __ext4_abort(struct super_block
*, const char *, unsigned int,
1746 __attribute__ ((format (printf
, 4, 5)));
1747 #define ext4_abort(sb, message...) __ext4_abort(sb, __func__, \
1748 __LINE__, ## message)
1749 extern void __ext4_warning(struct super_block
*, const char *, unsigned int,
1751 __attribute__ ((format (printf
, 4, 5)));
1752 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, \
1753 __LINE__, ## message)
1754 extern void ext4_msg(struct super_block
*, const char *, const char *, ...)
1755 __attribute__ ((format (printf
, 3, 4)));
1756 extern void __ext4_grp_locked_error(const char *, unsigned int, \
1757 struct super_block
*, ext4_group_t
, \
1758 unsigned long, ext4_fsblk_t
, \
1760 __attribute__ ((format (printf
, 7, 8)));
1761 #define ext4_grp_locked_error(sb, grp, message...) \
1762 __ext4_grp_locked_error(__func__, __LINE__, (sb), (grp), ## message)
1763 extern void ext4_update_dynamic_rev(struct super_block
*sb
);
1764 extern int ext4_update_compat_feature(handle_t
*handle
, struct super_block
*sb
,
1766 extern int ext4_update_rocompat_feature(handle_t
*handle
,
1767 struct super_block
*sb
, __u32 rocompat
);
1768 extern int ext4_update_incompat_feature(handle_t
*handle
,
1769 struct super_block
*sb
, __u32 incompat
);
1770 extern ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
1771 struct ext4_group_desc
*bg
);
1772 extern ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
1773 struct ext4_group_desc
*bg
);
1774 extern ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
1775 struct ext4_group_desc
*bg
);
1776 extern __u32
ext4_free_blks_count(struct super_block
*sb
,
1777 struct ext4_group_desc
*bg
);
1778 extern __u32
ext4_free_inodes_count(struct super_block
*sb
,
1779 struct ext4_group_desc
*bg
);
1780 extern __u32
ext4_used_dirs_count(struct super_block
*sb
,
1781 struct ext4_group_desc
*bg
);
1782 extern __u32
ext4_itable_unused_count(struct super_block
*sb
,
1783 struct ext4_group_desc
*bg
);
1784 extern void ext4_block_bitmap_set(struct super_block
*sb
,
1785 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1786 extern void ext4_inode_bitmap_set(struct super_block
*sb
,
1787 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1788 extern void ext4_inode_table_set(struct super_block
*sb
,
1789 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1790 extern void ext4_free_blks_set(struct super_block
*sb
,
1791 struct ext4_group_desc
*bg
, __u32 count
);
1792 extern void ext4_free_inodes_set(struct super_block
*sb
,
1793 struct ext4_group_desc
*bg
, __u32 count
);
1794 extern void ext4_used_dirs_set(struct super_block
*sb
,
1795 struct ext4_group_desc
*bg
, __u32 count
);
1796 extern void ext4_itable_unused_set(struct super_block
*sb
,
1797 struct ext4_group_desc
*bg
, __u32 count
);
1798 extern __le16
ext4_group_desc_csum(struct ext4_sb_info
*sbi
, __u32 group
,
1799 struct ext4_group_desc
*gdp
);
1800 extern int ext4_group_desc_csum_verify(struct ext4_sb_info
*sbi
, __u32 group
,
1801 struct ext4_group_desc
*gdp
);
1803 static inline ext4_fsblk_t
ext4_blocks_count(struct ext4_super_block
*es
)
1805 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_blocks_count_hi
) << 32) |
1806 le32_to_cpu(es
->s_blocks_count_lo
);
1809 static inline ext4_fsblk_t
ext4_r_blocks_count(struct ext4_super_block
*es
)
1811 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_r_blocks_count_hi
) << 32) |
1812 le32_to_cpu(es
->s_r_blocks_count_lo
);
1815 static inline ext4_fsblk_t
ext4_free_blocks_count(struct ext4_super_block
*es
)
1817 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_free_blocks_count_hi
) << 32) |
1818 le32_to_cpu(es
->s_free_blocks_count_lo
);
1821 static inline void ext4_blocks_count_set(struct ext4_super_block
*es
,
1824 es
->s_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1825 es
->s_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1828 static inline void ext4_free_blocks_count_set(struct ext4_super_block
*es
,
1831 es
->s_free_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1832 es
->s_free_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1835 static inline void ext4_r_blocks_count_set(struct ext4_super_block
*es
,
1838 es
->s_r_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1839 es
->s_r_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1842 static inline loff_t
ext4_isize(struct ext4_inode
*raw_inode
)
1844 if (S_ISREG(le16_to_cpu(raw_inode
->i_mode
)))
1845 return ((loff_t
)le32_to_cpu(raw_inode
->i_size_high
) << 32) |
1846 le32_to_cpu(raw_inode
->i_size_lo
);
1848 return (loff_t
) le32_to_cpu(raw_inode
->i_size_lo
);
1851 static inline void ext4_isize_set(struct ext4_inode
*raw_inode
, loff_t i_size
)
1853 raw_inode
->i_size_lo
= cpu_to_le32(i_size
);
1854 raw_inode
->i_size_high
= cpu_to_le32(i_size
>> 32);
1858 struct ext4_group_info
*ext4_get_group_info(struct super_block
*sb
,
1861 struct ext4_group_info
***grp_info
;
1862 long indexv
, indexh
;
1863 grp_info
= EXT4_SB(sb
)->s_group_info
;
1864 indexv
= group
>> (EXT4_DESC_PER_BLOCK_BITS(sb
));
1865 indexh
= group
& ((EXT4_DESC_PER_BLOCK(sb
)) - 1);
1866 return grp_info
[indexv
][indexh
];
1870 * Reading s_groups_count requires using smp_rmb() afterwards. See
1871 * the locking protocol documented in the comments of ext4_group_add()
1874 static inline ext4_group_t
ext4_get_groups_count(struct super_block
*sb
)
1876 ext4_group_t ngroups
= EXT4_SB(sb
)->s_groups_count
;
1882 static inline ext4_group_t
ext4_flex_group(struct ext4_sb_info
*sbi
,
1883 ext4_group_t block_group
)
1885 return block_group
>> sbi
->s_log_groups_per_flex
;
1888 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info
*sbi
)
1890 return 1 << sbi
->s_log_groups_per_flex
;
1893 #define ext4_std_error(sb, errno) \
1896 __ext4_std_error((sb), __func__, __LINE__, (errno)); \
1900 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1901 * counters. So we need to make sure we have free blocks more
1902 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1904 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1906 #define EXT4_FREEBLOCKS_WATERMARK 0
1909 static inline void ext4_update_i_disksize(struct inode
*inode
, loff_t newsize
)
1912 * XXX: replace with spinlock if seen contended -bzzz
1914 down_write(&EXT4_I(inode
)->i_data_sem
);
1915 if (newsize
> EXT4_I(inode
)->i_disksize
)
1916 EXT4_I(inode
)->i_disksize
= newsize
;
1917 up_write(&EXT4_I(inode
)->i_data_sem
);
1921 struct ext4_group_info
{
1922 unsigned long bb_state
;
1923 struct rb_root bb_free_root
;
1924 ext4_grpblk_t bb_first_free
; /* first free block */
1925 ext4_grpblk_t bb_free
; /* total free blocks */
1926 ext4_grpblk_t bb_fragments
; /* nr of freespace fragments */
1927 ext4_grpblk_t bb_largest_free_order
;/* order of largest frag in BG */
1928 struct list_head bb_prealloc_list
;
1932 struct rw_semaphore alloc_sem
;
1933 ext4_grpblk_t bb_counters
[]; /* Nr of free power-of-two-block
1934 * regions, index is order.
1935 * bb_counters[3] = 5 means
1936 * 5 free 8-block regions. */
1939 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1941 #define EXT4_MB_GRP_NEED_INIT(grp) \
1942 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1944 #define EXT4_MAX_CONTENTION 8
1945 #define EXT4_CONTENTION_THRESHOLD 2
1947 static inline spinlock_t
*ext4_group_lock_ptr(struct super_block
*sb
,
1950 return bgl_lock_ptr(EXT4_SB(sb
)->s_blockgroup_lock
, group
);
1954 * Returns true if the filesystem is busy enough that attempts to
1955 * access the block group locks has run into contention.
1957 static inline int ext4_fs_is_busy(struct ext4_sb_info
*sbi
)
1959 return (atomic_read(&sbi
->s_lock_busy
) > EXT4_CONTENTION_THRESHOLD
);
1962 static inline void ext4_lock_group(struct super_block
*sb
, ext4_group_t group
)
1964 spinlock_t
*lock
= ext4_group_lock_ptr(sb
, group
);
1965 if (spin_trylock(lock
))
1967 * We're able to grab the lock right away, so drop the
1968 * lock contention counter.
1970 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, -1, 0);
1973 * The lock is busy, so bump the contention counter,
1974 * and then wait on the spin lock.
1976 atomic_add_unless(&EXT4_SB(sb
)->s_lock_busy
, 1,
1977 EXT4_MAX_CONTENTION
);
1982 static inline void ext4_unlock_group(struct super_block
*sb
,
1985 spin_unlock(ext4_group_lock_ptr(sb
, group
));
1988 static inline void ext4_mark_super_dirty(struct super_block
*sb
)
1990 if (EXT4_SB(sb
)->s_journal
== NULL
)
1995 * Inodes and files operations
1999 extern const struct file_operations ext4_dir_operations
;
2002 extern const struct inode_operations ext4_file_inode_operations
;
2003 extern const struct file_operations ext4_file_operations
;
2004 extern loff_t
ext4_llseek(struct file
*file
, loff_t offset
, int origin
);
2007 extern const struct inode_operations ext4_dir_inode_operations
;
2008 extern const struct inode_operations ext4_special_inode_operations
;
2009 extern struct dentry
*ext4_get_parent(struct dentry
*child
);
2012 extern const struct inode_operations ext4_symlink_inode_operations
;
2013 extern const struct inode_operations ext4_fast_symlink_inode_operations
;
2015 /* block_validity */
2016 extern void ext4_release_system_zone(struct super_block
*sb
);
2017 extern int ext4_setup_system_zone(struct super_block
*sb
);
2018 extern int __init
init_ext4_system_zone(void);
2019 extern void exit_ext4_system_zone(void);
2020 extern int ext4_data_block_valid(struct ext4_sb_info
*sbi
,
2021 ext4_fsblk_t start_blk
,
2022 unsigned int count
);
2025 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
2026 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
2027 extern int ext4_ext_index_trans_blocks(struct inode
*inode
, int nrblocks
,
2029 extern int ext4_ext_map_blocks(handle_t
*handle
, struct inode
*inode
,
2030 struct ext4_map_blocks
*map
, int flags
);
2031 extern void ext4_ext_truncate(struct inode
*);
2032 extern void ext4_ext_init(struct super_block
*);
2033 extern void ext4_ext_release(struct super_block
*);
2034 extern long ext4_fallocate(struct inode
*inode
, int mode
, loff_t offset
,
2036 extern int ext4_convert_unwritten_extents(struct inode
*inode
, loff_t offset
,
2038 extern int ext4_map_blocks(handle_t
*handle
, struct inode
*inode
,
2039 struct ext4_map_blocks
*map
, int flags
);
2040 extern int ext4_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
2041 __u64 start
, __u64 len
);
2043 extern int ext4_move_extents(struct file
*o_filp
, struct file
*d_filp
,
2044 __u64 start_orig
, __u64 start_donor
,
2045 __u64 len
, __u64
*moved_len
);
2048 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
2049 enum ext4_state_bits
{
2050 BH_Uninit
/* blocks are allocated but uninitialized on disk */
2051 = BH_JBDPrivateStart
,
2054 BUFFER_FNS(Uninit
, uninit
)
2055 TAS_BUFFER_FNS(Uninit
, uninit
)
2058 * Add new method to test wether block and inode bitmaps are properly
2059 * initialized. With uninit_bg reading the block from disk is not enough
2060 * to mark the bitmap uptodate. We need to also zero-out the bitmap
2062 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
2064 static inline int bitmap_uptodate(struct buffer_head
*bh
)
2066 return (buffer_uptodate(bh
) &&
2067 test_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
));
2069 static inline void set_bitmap_uptodate(struct buffer_head
*bh
)
2071 set_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
);
2074 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
2076 #endif /* __KERNEL__ */
2078 #endif /* _EXT4_H */