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>
34 * The fourth extended filesystem constants/structures
38 * Define EXT4FS_DEBUG to produce debug messages
46 #define ext4_debug(f, a...) \
48 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
49 __FILE__, __LINE__, __func__); \
50 printk(KERN_DEBUG f, ## a); \
53 #define ext4_debug(f, a...) do {} while (0)
56 /* data type for block offset of block group */
57 typedef int ext4_grpblk_t;
59 /* data type for filesystem-wide blocks number */
60 typedef unsigned long long ext4_fsblk_t;
62 /* data type for file logical block number */
63 typedef __u32 ext4_lblk_t;
65 /* data type for block group number */
66 typedef unsigned int ext4_group_t;
69 /* prefer goal again. length */
70 #define EXT4_MB_HINT_MERGE 0x0001
71 /* blocks already reserved */
72 #define EXT4_MB_HINT_RESERVED 0x0002
73 /* metadata is being allocated */
74 #define EXT4_MB_HINT_METADATA 0x0004
75 /* first blocks in the file */
76 #define EXT4_MB_HINT_FIRST 0x0008
77 /* search for the best chunk */
78 #define EXT4_MB_HINT_BEST 0x0010
79 /* data is being allocated */
80 #define EXT4_MB_HINT_DATA 0x0020
81 /* don't preallocate (for tails) */
82 #define EXT4_MB_HINT_NOPREALLOC 0x0040
83 /* allocate for locality group */
84 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
85 /* allocate goal blocks or none */
86 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
87 /* goal is meaningful */
88 #define EXT4_MB_HINT_TRY_GOAL 0x0200
89 /* blocks already pre-reserved by delayed allocation */
90 #define EXT4_MB_DELALLOC_RESERVED 0x0400
91 /* We are doing stream allocation */
92 #define EXT4_MB_STREAM_ALLOC 0x0800
95 struct ext4_allocation_request {
96 /* target inode for block we're allocating */
98 /* how many blocks we want to allocate */
100 /* logical block in target inode */
102 /* the closest logical allocated block to the left */
104 /* the closest logical allocated block to the right */
106 /* phys. target (a hint) */
108 /* phys. block for the closest logical allocated block to the left */
110 /* phys. block for the closest logical allocated block to the right */
112 /* flags. see above EXT4_MB_HINT_* */
117 * For delayed allocation tracking
119 struct mpage_da_data {
121 sector_t b_blocknr; /* start block number of extent */
122 size_t b_size; /* size of extent */
123 unsigned long b_state; /* state of the extent */
124 unsigned long first_page, next_page; /* extent of pages */
125 struct writeback_control *wbc;
131 typedef struct ext4_io_end {
132 struct inode *inode; /* file being written to */
133 unsigned int flag; /* sync IO or AIO */
134 int error; /* I/O error code */
135 ext4_lblk_t offset; /* offset in the file */
136 size_t size; /* size of the extent */
137 struct work_struct work; /* data work queue */
141 * Special inodes numbers
143 #define EXT4_BAD_INO 1 /* Bad blocks inode */
144 #define EXT4_ROOT_INO 2 /* Root inode */
145 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
146 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
147 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
148 #define EXT4_JOURNAL_INO 8 /* Journal inode */
150 /* First non-reserved inode for old ext4 filesystems */
151 #define EXT4_GOOD_OLD_FIRST_INO 11
154 * Maximal count of links to a file
156 #define EXT4_LINK_MAX 65000
159 * Macro-instructions used to manage several block sizes
161 #define EXT4_MIN_BLOCK_SIZE 1024
162 #define EXT4_MAX_BLOCK_SIZE 65536
163 #define EXT4_MIN_BLOCK_LOG_SIZE 10
165 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
167 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
169 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
171 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
173 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
176 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
177 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
178 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
180 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
181 EXT4_GOOD_OLD_INODE_SIZE : \
183 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
184 EXT4_GOOD_OLD_FIRST_INO : \
187 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
190 * Structure of a blocks group descriptor
192 struct ext4_group_desc
194 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
195 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
196 __le32 bg_inode_table_lo; /* Inodes table block */
197 __le16 bg_free_blocks_count_lo;/* Free blocks count */
198 __le16 bg_free_inodes_count_lo;/* Free inodes count */
199 __le16 bg_used_dirs_count_lo; /* Directories count */
200 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
201 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
202 __le16 bg_itable_unused_lo; /* Unused inodes count */
203 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
204 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
205 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
206 __le32 bg_inode_table_hi; /* Inodes table block MSB */
207 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
208 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
209 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
210 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
211 __u32 bg_reserved2[3];
215 * Structure of a flex block group info
219 atomic_t free_inodes;
220 atomic_t free_blocks;
224 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
225 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
226 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
229 * Macro-instructions used to manage group descriptors
231 #define EXT4_MIN_DESC_SIZE 32
232 #define EXT4_MIN_DESC_SIZE_64BIT 64
233 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
234 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
236 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
237 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
238 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
239 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
241 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
242 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
243 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
247 * Constants relative to the data blocks
249 #define EXT4_NDIR_BLOCKS 12
250 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
251 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
252 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
253 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
258 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
259 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
260 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
261 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
262 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
263 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
264 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
265 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
266 /* Reserved for compression usage... */
267 #define EXT4_DIRTY_FL 0x00000100
268 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
269 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
270 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
271 /* End compression flags --- maybe not all used */
272 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
273 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
274 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
275 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
276 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
277 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
278 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
279 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
280 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
282 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
283 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
285 /* Flags that should be inherited by new inodes from their parent. */
286 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
287 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
288 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
289 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
290 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
292 /* Flags that are appropriate for regular files (all but dir-specific ones). */
293 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
295 /* Flags that are appropriate for non-directories/regular files. */
296 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
298 /* Mask out flags that are inappropriate for the given type of inode. */
299 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
303 else if (S_ISREG(mode))
304 return flags & EXT4_REG_FLMASK;
306 return flags & EXT4_OTHER_FLMASK;
310 * Inode dynamic state flags
312 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
313 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
314 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
315 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
316 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
317 #define EXT4_STATE_EXT_MIGRATE 0x00000020 /* Inode is migrating */
319 /* Used to pass group descriptor data when online resize is done */
320 struct ext4_new_group_input {
321 __u32 group; /* Group number for this data */
322 __u64 block_bitmap; /* Absolute block number of block bitmap */
323 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
324 __u64 inode_table; /* Absolute block number of inode table start */
325 __u32 blocks_count; /* Total number of blocks in this group */
326 __u16 reserved_blocks; /* Number of reserved blocks in this group */
330 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
331 struct ext4_new_group_data {
337 __u16 reserved_blocks;
339 __u32 free_blocks_count;
343 * Flags used by ext4_get_blocks()
345 /* Allocate any needed blocks and/or convert an unitialized
346 extent to be an initialized ext4 */
347 #define EXT4_GET_BLOCKS_CREATE 0x0001
348 /* Request the creation of an unitialized extent */
349 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
350 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
351 EXT4_GET_BLOCKS_CREATE)
352 /* Caller is from the delayed allocation writeout path,
353 so set the magic i_delalloc_reserve_flag after taking the
354 inode allocation semaphore for */
355 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
356 /* Call ext4_da_update_reserve_space() after successfully
357 allocating the blocks */
358 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
359 /* caller is from the direct IO path, request to creation of an
360 unitialized extents if not allocated, split the uninitialized
361 extent if blocks has been preallocated already*/
362 #define EXT4_GET_BLOCKS_DIO 0x0010
363 #define EXT4_GET_BLOCKS_CONVERT 0x0020
364 #define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\
365 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
366 /* Convert extent to initialized after direct IO complete */
367 #define EXT4_GET_BLOCKS_DIO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
368 EXT4_GET_BLOCKS_DIO_CREATE_EXT)
373 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
374 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
375 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
376 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
377 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
378 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
379 #ifdef CONFIG_JBD2_DEBUG
380 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
382 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
383 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
384 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
385 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
386 #define EXT4_IOC_MIGRATE _IO('f', 9)
387 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
388 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
389 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
390 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
393 * ioctl commands in 32 bit emulation
395 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
396 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
397 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
398 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
399 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
400 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
401 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
402 #ifdef CONFIG_JBD2_DEBUG
403 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
405 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
406 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
412 struct ext4_mount_options {
413 unsigned long s_mount_opt;
416 unsigned long s_commit_interval;
417 u32 s_min_batch_time, s_max_batch_time;
420 char *s_qf_names[MAXQUOTAS];
424 /* Max physical block we can addres w/o extents */
425 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
428 * Structure of an inode on the disk
431 __le16 i_mode; /* File mode */
432 __le16 i_uid; /* Low 16 bits of Owner Uid */
433 __le32 i_size_lo; /* Size in bytes */
434 __le32 i_atime; /* Access time */
435 __le32 i_ctime; /* Inode Change time */
436 __le32 i_mtime; /* Modification time */
437 __le32 i_dtime; /* Deletion Time */
438 __le16 i_gid; /* Low 16 bits of Group Id */
439 __le16 i_links_count; /* Links count */
440 __le32 i_blocks_lo; /* Blocks count */
441 __le32 i_flags; /* File flags */
447 __u32 h_i_translator;
452 } osd1; /* OS dependent 1 */
453 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
454 __le32 i_generation; /* File version (for NFS) */
455 __le32 i_file_acl_lo; /* File ACL */
457 __le32 i_obso_faddr; /* Obsoleted fragment address */
460 __le16 l_i_blocks_high; /* were l_i_reserved1 */
461 __le16 l_i_file_acl_high;
462 __le16 l_i_uid_high; /* these 2 fields */
463 __le16 l_i_gid_high; /* were reserved2[0] */
467 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
474 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
475 __le16 m_i_file_acl_high;
476 __u32 m_i_reserved2[2];
478 } osd2; /* OS dependent 2 */
479 __le16 i_extra_isize;
481 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
482 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
483 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
484 __le32 i_crtime; /* File Creation time */
485 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
486 __le32 i_version_hi; /* high 32 bits for 64-bit version */
490 __u32 reserved; /* should be zero */
491 __u32 donor_fd; /* donor file descriptor */
492 __u64 orig_start; /* logical start offset in block for orig */
493 __u64 donor_start; /* logical start offset in block for donor */
494 __u64 len; /* block length to be moved */
495 __u64 moved_len; /* moved block length */
498 #define EXT4_EPOCH_BITS 2
499 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
500 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
503 * Extended fields will fit into an inode if the filesystem was formatted
504 * with large inodes (-I 256 or larger) and there are not currently any EAs
505 * consuming all of the available space. For new inodes we always reserve
506 * enough space for the kernel's known extended fields, but for inodes
507 * created with an old kernel this might not have been the case. None of
508 * the extended inode fields is critical for correct filesystem operation.
509 * This macro checks if a certain field fits in the inode. Note that
510 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
512 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
513 ((offsetof(typeof(*ext4_inode), field) + \
514 sizeof((ext4_inode)->field)) \
515 <= (EXT4_GOOD_OLD_INODE_SIZE + \
516 (einode)->i_extra_isize)) \
518 static inline __le32 ext4_encode_extra_time(struct timespec *time)
520 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
521 time->tv_sec >> 32 : 0) |
522 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
525 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
527 if (sizeof(time->tv_sec) > 4)
528 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
530 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
533 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
535 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
536 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
537 (raw_inode)->xtime ## _extra = \
538 ext4_encode_extra_time(&(inode)->xtime); \
541 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
543 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
544 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
545 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
546 (raw_inode)->xtime ## _extra = \
547 ext4_encode_extra_time(&(einode)->xtime); \
550 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
552 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
553 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
554 ext4_decode_extra_time(&(inode)->xtime, \
555 raw_inode->xtime ## _extra); \
558 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
560 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
561 (einode)->xtime.tv_sec = \
562 (signed)le32_to_cpu((raw_inode)->xtime); \
563 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
564 ext4_decode_extra_time(&(einode)->xtime, \
565 raw_inode->xtime ## _extra); \
568 #define i_disk_version osd1.linux1.l_i_version
570 #if defined(__KERNEL__) || defined(__linux__)
571 #define i_reserved1 osd1.linux1.l_i_reserved1
572 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
573 #define i_blocks_high osd2.linux2.l_i_blocks_high
574 #define i_uid_low i_uid
575 #define i_gid_low i_gid
576 #define i_uid_high osd2.linux2.l_i_uid_high
577 #define i_gid_high osd2.linux2.l_i_gid_high
578 #define i_reserved2 osd2.linux2.l_i_reserved2
580 #elif defined(__GNU__)
582 #define i_translator osd1.hurd1.h_i_translator
583 #define i_uid_high osd2.hurd2.h_i_uid_high
584 #define i_gid_high osd2.hurd2.h_i_gid_high
585 #define i_author osd2.hurd2.h_i_author
587 #elif defined(__masix__)
589 #define i_reserved1 osd1.masix1.m_i_reserved1
590 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
591 #define i_reserved2 osd2.masix2.m_i_reserved2
593 #endif /* defined(__KERNEL__) || defined(__linux__) */
596 * storage for cached extent
598 struct ext4_ext_cache {
599 ext4_fsblk_t ec_start;
600 ext4_lblk_t ec_block;
601 __u32 ec_len; /* must be 32bit to return holes */
606 * fourth extended file system inode data in memory
608 struct ext4_inode_info {
609 __le32 i_data[15]; /* unconverted */
611 ext4_fsblk_t i_file_acl;
615 * i_block_group is the number of the block group which contains
616 * this file's inode. Constant across the lifetime of the inode,
617 * it is ued for making block allocation decisions - we try to
618 * place a file's data blocks near its inode block, and new inodes
619 * near to their parent directory's inode.
621 ext4_group_t i_block_group;
622 __u32 i_state; /* Dynamic state flags for ext4 */
624 ext4_lblk_t i_dir_start_lookup;
625 #ifdef CONFIG_EXT4_FS_XATTR
627 * Extended attributes can be read independently of the main file
628 * data. Taking i_mutex even when reading would cause contention
629 * between readers of EAs and writers of regular file data, so
630 * instead we synchronize on xattr_sem when reading or changing
633 struct rw_semaphore xattr_sem;
636 struct list_head i_orphan; /* unlinked but open inodes */
639 * i_disksize keeps track of what the inode size is ON DISK, not
640 * in memory. During truncate, i_size is set to the new size by
641 * the VFS prior to calling ext4_truncate(), but the filesystem won't
642 * set i_disksize to 0 until the truncate is actually under way.
644 * The intent is that i_disksize always represents the blocks which
645 * are used by this file. This allows recovery to restart truncate
646 * on orphans if we crash during truncate. We actually write i_disksize
647 * into the on-disk inode when writing inodes out, instead of i_size.
649 * The only time when i_disksize and i_size may be different is when
650 * a truncate is in progress. The only things which change i_disksize
651 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
656 * i_data_sem is for serialising ext4_truncate() against
657 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
658 * data tree are chopped off during truncate. We can't do that in
659 * ext4 because whenever we perform intermediate commits during
660 * truncate, the inode and all the metadata blocks *must* be in a
661 * consistent state which allows truncation of the orphans to restart
662 * during recovery. Hence we must fix the get_block-vs-truncate race
663 * by other means, so we have i_data_sem.
665 struct rw_semaphore i_data_sem;
666 struct inode vfs_inode;
667 struct jbd2_inode jinode;
669 struct ext4_ext_cache i_cached_extent;
671 * File creation time. Its function is same as that of
672 * struct timespec i_{a,c,m}time in the generic inode.
674 struct timespec i_crtime;
677 struct list_head i_prealloc_list;
678 spinlock_t i_prealloc_lock;
681 ext4_group_t i_last_alloc_group;
683 /* allocation reservation info for delalloc */
684 unsigned int i_reserved_data_blocks;
685 unsigned int i_reserved_meta_blocks;
686 unsigned int i_allocated_meta_blocks;
687 unsigned short i_delalloc_reserved_flag;
689 /* on-disk additional length */
692 spinlock_t i_block_reservation_lock;
698 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
699 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
700 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
703 * Misc. filesystem flags
705 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
706 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
707 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
712 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
713 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
714 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
715 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
716 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
717 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
718 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
719 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
720 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
721 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
722 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
723 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
724 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
725 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
726 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
727 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
728 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
729 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
730 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
731 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
732 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
733 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
734 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
735 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
736 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
737 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
738 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
740 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
741 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
742 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
745 #define ext4_set_bit ext2_set_bit
746 #define ext4_set_bit_atomic ext2_set_bit_atomic
747 #define ext4_clear_bit ext2_clear_bit
748 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
749 #define ext4_test_bit ext2_test_bit
750 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
751 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
752 #define ext4_find_next_bit ext2_find_next_bit
755 * Maximal mount counts between two filesystem checks
757 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
758 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
761 * Behaviour when detecting errors
763 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
764 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
765 #define EXT4_ERRORS_PANIC 3 /* Panic */
766 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
769 * Structure of the super block
771 struct ext4_super_block {
772 /*00*/ __le32 s_inodes_count; /* Inodes count */
773 __le32 s_blocks_count_lo; /* Blocks count */
774 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
775 __le32 s_free_blocks_count_lo; /* Free blocks count */
776 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
777 __le32 s_first_data_block; /* First Data Block */
778 __le32 s_log_block_size; /* Block size */
779 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
780 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
781 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
782 __le32 s_inodes_per_group; /* # Inodes per group */
783 __le32 s_mtime; /* Mount time */
784 /*30*/ __le32 s_wtime; /* Write time */
785 __le16 s_mnt_count; /* Mount count */
786 __le16 s_max_mnt_count; /* Maximal mount count */
787 __le16 s_magic; /* Magic signature */
788 __le16 s_state; /* File system state */
789 __le16 s_errors; /* Behaviour when detecting errors */
790 __le16 s_minor_rev_level; /* minor revision level */
791 /*40*/ __le32 s_lastcheck; /* time of last check */
792 __le32 s_checkinterval; /* max. time between checks */
793 __le32 s_creator_os; /* OS */
794 __le32 s_rev_level; /* Revision level */
795 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
796 __le16 s_def_resgid; /* Default gid for reserved blocks */
798 * These fields are for EXT4_DYNAMIC_REV superblocks only.
800 * Note: the difference between the compatible feature set and
801 * the incompatible feature set is that if there is a bit set
802 * in the incompatible feature set that the kernel doesn't
803 * know about, it should refuse to mount the filesystem.
805 * e2fsck's requirements are more strict; if it doesn't know
806 * about a feature in either the compatible or incompatible
807 * feature set, it must abort and not try to meddle with
808 * things it doesn't understand...
810 __le32 s_first_ino; /* First non-reserved inode */
811 __le16 s_inode_size; /* size of inode structure */
812 __le16 s_block_group_nr; /* block group # of this superblock */
813 __le32 s_feature_compat; /* compatible feature set */
814 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
815 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
816 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
817 /*78*/ char s_volume_name[16]; /* volume name */
818 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
819 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
821 * Performance hints. Directory preallocation should only
822 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
824 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
825 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
826 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
828 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
830 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
831 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
832 __le32 s_journal_dev; /* device number of journal file */
833 __le32 s_last_orphan; /* start of list of inodes to delete */
834 __le32 s_hash_seed[4]; /* HTREE hash seed */
835 __u8 s_def_hash_version; /* Default hash version to use */
836 __u8 s_reserved_char_pad;
837 __le16 s_desc_size; /* size of group descriptor */
838 /*100*/ __le32 s_default_mount_opts;
839 __le32 s_first_meta_bg; /* First metablock block group */
840 __le32 s_mkfs_time; /* When the filesystem was created */
841 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
842 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
843 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
844 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
845 __le32 s_free_blocks_count_hi; /* Free blocks count */
846 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
847 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
848 __le32 s_flags; /* Miscellaneous flags */
849 __le16 s_raid_stride; /* RAID stride */
850 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
851 __le64 s_mmp_block; /* Block for multi-mount protection */
852 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
853 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
854 __u8 s_reserved_char_pad2;
855 __le16 s_reserved_pad;
856 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
857 __u32 s_reserved[160]; /* Padding to the end of the block */
863 * run-time mount flags
865 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
866 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
869 * fourth extended-fs super-block data in memory
871 struct ext4_sb_info {
872 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
873 unsigned long s_inodes_per_block;/* Number of inodes per block */
874 unsigned long s_blocks_per_group;/* Number of blocks in a group */
875 unsigned long s_inodes_per_group;/* Number of inodes in a group */
876 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
877 unsigned long s_gdb_count; /* Number of group descriptor blocks */
878 unsigned long s_desc_per_block; /* Number of group descriptors per block */
879 ext4_group_t s_groups_count; /* Number of groups in the fs */
880 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
881 unsigned long s_overhead_last; /* Last calculated overhead */
882 unsigned long s_blocks_last; /* Last seen block count */
883 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
884 struct buffer_head * s_sbh; /* Buffer containing the super block */
885 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
886 struct buffer_head **s_group_desc;
887 unsigned int s_mount_opt;
888 unsigned int s_mount_flags;
889 ext4_fsblk_t s_sb_block;
892 unsigned short s_mount_state;
893 unsigned short s_pad;
894 int s_addr_per_block_bits;
895 int s_desc_per_block_bits;
898 unsigned int s_inode_readahead_blks;
899 unsigned int s_inode_goal;
900 spinlock_t s_next_gen_lock;
901 u32 s_next_generation;
903 int s_def_hash_version;
904 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
905 struct percpu_counter s_freeblocks_counter;
906 struct percpu_counter s_freeinodes_counter;
907 struct percpu_counter s_dirs_counter;
908 struct percpu_counter s_dirtyblocks_counter;
909 struct blockgroup_lock *s_blockgroup_lock;
910 struct proc_dir_entry *s_proc;
911 struct kobject s_kobj;
912 struct completion s_kobj_unregister;
915 struct inode *s_journal_inode;
916 struct journal_s *s_journal;
917 struct list_head s_orphan;
918 struct mutex s_orphan_lock;
919 struct mutex s_resize_lock;
920 unsigned long s_commit_interval;
921 u32 s_max_batch_time;
922 u32 s_min_batch_time;
923 struct block_device *journal_bdev;
924 #ifdef CONFIG_JBD2_DEBUG
925 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
926 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
929 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
930 int s_jquota_fmt; /* Format of quota to use */
932 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
933 struct rb_root system_blks;
936 /* ext4 extents stats */
937 unsigned long s_ext_min;
938 unsigned long s_ext_max;
939 unsigned long s_depth_max;
940 spinlock_t s_ext_stats_lock;
941 unsigned long s_ext_blocks;
942 unsigned long s_ext_extents;
945 /* for buddy allocator */
946 struct ext4_group_info ***s_group_info;
947 struct inode *s_buddy_cache;
948 long s_blocks_reserved;
949 spinlock_t s_reserve_lock;
950 spinlock_t s_md_lock;
951 tid_t s_last_transaction;
952 unsigned short *s_mb_offsets;
953 unsigned int *s_mb_maxs;
956 unsigned long s_stripe;
957 unsigned int s_mb_stream_request;
958 unsigned int s_mb_max_to_scan;
959 unsigned int s_mb_min_to_scan;
960 unsigned int s_mb_stats;
961 unsigned int s_mb_order2_reqs;
962 unsigned int s_mb_group_prealloc;
963 unsigned int s_max_writeback_mb_bump;
964 /* where last allocation was done - for stream allocation */
965 unsigned long s_mb_last_group;
966 unsigned long s_mb_last_start;
968 /* history to debug policy */
969 struct ext4_mb_history *s_mb_history;
970 int s_mb_history_cur;
971 int s_mb_history_max;
972 int s_mb_history_num;
973 spinlock_t s_mb_history_lock;
974 int s_mb_history_filter;
976 /* stats for buddy allocator */
977 spinlock_t s_mb_pa_lock;
978 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
979 atomic_t s_bal_success; /* we found long enough chunks */
980 atomic_t s_bal_allocated; /* in blocks */
981 atomic_t s_bal_ex_scanned; /* total extents scanned */
982 atomic_t s_bal_goals; /* goal hits */
983 atomic_t s_bal_breaks; /* too long searches */
984 atomic_t s_bal_2orders; /* 2^order hits */
985 spinlock_t s_bal_lock;
986 unsigned long s_mb_buddies_generated;
987 unsigned long long s_mb_generation_time;
988 atomic_t s_mb_lost_chunks;
989 atomic_t s_mb_preallocated;
990 atomic_t s_mb_discarded;
991 atomic_t s_lock_busy;
993 /* locality groups */
994 struct ext4_locality_group *s_locality_groups;
996 /* for write statistics */
997 unsigned long s_sectors_written_start;
998 u64 s_kbytes_written;
1000 unsigned int s_log_groups_per_flex;
1001 struct flex_groups *s_flex_groups;
1004 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1006 return sb->s_fs_info;
1008 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1010 return container_of(inode, struct ext4_inode_info, vfs_inode);
1013 static inline struct timespec ext4_current_time(struct inode *inode)
1015 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1016 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1019 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1021 return ino == EXT4_ROOT_INO ||
1022 ino == EXT4_JOURNAL_INO ||
1023 ino == EXT4_RESIZE_INO ||
1024 (ino >= EXT4_FIRST_INO(sb) &&
1025 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1028 /* Assume that user mode programs are passing in an ext4fs superblock, not
1029 * a kernel struct super_block. This will allow us to call the feature-test
1030 * macros from user land. */
1031 #define EXT4_SB(sb) (sb)
1034 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1037 * Codes for operating systems
1039 #define EXT4_OS_LINUX 0
1040 #define EXT4_OS_HURD 1
1041 #define EXT4_OS_MASIX 2
1042 #define EXT4_OS_FREEBSD 3
1043 #define EXT4_OS_LITES 4
1048 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1049 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1051 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1052 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1054 #define EXT4_GOOD_OLD_INODE_SIZE 128
1057 * Feature set definitions
1060 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1061 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1062 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1063 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1064 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1065 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1066 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1067 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1068 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1069 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1070 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1071 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1072 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1073 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1074 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1075 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1076 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1077 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1079 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1080 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1081 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1082 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1083 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1084 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1086 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1087 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1088 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1089 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1090 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1091 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1092 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1094 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1095 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1096 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1097 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1098 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1099 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1100 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1101 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1102 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1104 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1105 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1106 EXT4_FEATURE_INCOMPAT_RECOVER| \
1107 EXT4_FEATURE_INCOMPAT_META_BG| \
1108 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1109 EXT4_FEATURE_INCOMPAT_64BIT| \
1110 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1111 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1112 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1113 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1114 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1115 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1116 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1117 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1120 * Default values for user and/or group using reserved blocks
1122 #define EXT4_DEF_RESUID 0
1123 #define EXT4_DEF_RESGID 0
1125 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1128 * Default mount options
1130 #define EXT4_DEFM_DEBUG 0x0001
1131 #define EXT4_DEFM_BSDGROUPS 0x0002
1132 #define EXT4_DEFM_XATTR_USER 0x0004
1133 #define EXT4_DEFM_ACL 0x0008
1134 #define EXT4_DEFM_UID16 0x0010
1135 #define EXT4_DEFM_JMODE 0x0060
1136 #define EXT4_DEFM_JMODE_DATA 0x0020
1137 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1138 #define EXT4_DEFM_JMODE_WBACK 0x0060
1141 * Default journal batch times
1143 #define EXT4_DEF_MIN_BATCH_TIME 0
1144 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1147 * Minimum number of groups in a flexgroup before we separate out
1148 * directories into the first block group of a flexgroup
1150 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1153 * Structure of a directory entry
1155 #define EXT4_NAME_LEN 255
1157 struct ext4_dir_entry {
1158 __le32 inode; /* Inode number */
1159 __le16 rec_len; /* Directory entry length */
1160 __le16 name_len; /* Name length */
1161 char name[EXT4_NAME_LEN]; /* File name */
1165 * The new version of the directory entry. Since EXT4 structures are
1166 * stored in intel byte order, and the name_len field could never be
1167 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1170 struct ext4_dir_entry_2 {
1171 __le32 inode; /* Inode number */
1172 __le16 rec_len; /* Directory entry length */
1173 __u8 name_len; /* Name length */
1175 char name[EXT4_NAME_LEN]; /* File name */
1179 * Ext4 directory file types. Only the low 3 bits are used. The
1180 * other bits are reserved for now.
1182 #define EXT4_FT_UNKNOWN 0
1183 #define EXT4_FT_REG_FILE 1
1184 #define EXT4_FT_DIR 2
1185 #define EXT4_FT_CHRDEV 3
1186 #define EXT4_FT_BLKDEV 4
1187 #define EXT4_FT_FIFO 5
1188 #define EXT4_FT_SOCK 6
1189 #define EXT4_FT_SYMLINK 7
1191 #define EXT4_FT_MAX 8
1194 * EXT4_DIR_PAD defines the directory entries boundaries
1196 * NOTE: It must be a multiple of 4
1198 #define EXT4_DIR_PAD 4
1199 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1200 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1202 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1205 * Hash Tree Directory indexing
1206 * (c) Daniel Phillips, 2001
1209 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1210 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1211 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1212 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1213 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1215 /* Legal values for the dx_root hash_version field: */
1217 #define DX_HASH_LEGACY 0
1218 #define DX_HASH_HALF_MD4 1
1219 #define DX_HASH_TEA 2
1220 #define DX_HASH_LEGACY_UNSIGNED 3
1221 #define DX_HASH_HALF_MD4_UNSIGNED 4
1222 #define DX_HASH_TEA_UNSIGNED 5
1226 /* hash info structure used by the directory hash */
1235 #define EXT4_HTREE_EOF 0x7fffffff
1238 * Control parameters used by ext4_htree_next_block
1240 #define HASH_NB_ALWAYS 1
1244 * Describe an inode's exact location on disk and in memory
1248 struct buffer_head *bh;
1249 unsigned long offset;
1250 ext4_group_t block_group;
1253 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1255 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1259 * This structure is stuffed into the struct file's private_data field
1260 * for directories. It is where we put information so that we can do
1261 * readdir operations in hash tree order.
1263 struct dir_private_info {
1264 struct rb_root root;
1265 struct rb_node *curr_node;
1266 struct fname *extra_fname;
1269 __u32 curr_minor_hash;
1273 /* calculate the first block number of the group */
1274 static inline ext4_fsblk_t
1275 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1277 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1278 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1282 * Special error return code only used by dx_probe() and its callers.
1284 #define ERR_BAD_DX_DIR -75000
1286 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1287 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1289 extern struct proc_dir_entry *ext4_proc_root;
1292 * Function prototypes
1296 * Ok, these declarations are also in <linux/kernel.h> but none of the
1297 * ext4 source programs needs to include it so they are duplicated here.
1299 # define NORET_TYPE /**/
1300 # define ATTRIB_NORET __attribute__((noreturn))
1301 # define NORET_AND noreturn,
1304 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1307 extern unsigned int ext4_block_group(struct super_block *sb,
1308 ext4_fsblk_t blocknr);
1309 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1310 ext4_fsblk_t blocknr);
1311 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1312 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1313 ext4_group_t group);
1314 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1315 ext4_fsblk_t goal, unsigned long *count, int *errp);
1316 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1317 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1318 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1319 ext4_fsblk_t block, unsigned long count, int metadata);
1320 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1321 ext4_fsblk_t block, unsigned long count);
1322 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1323 extern void ext4_check_blocks_bitmap(struct super_block *);
1324 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1325 ext4_group_t block_group,
1326 struct buffer_head ** bh);
1327 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1328 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1329 ext4_group_t block_group);
1330 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1331 struct buffer_head *bh,
1333 struct ext4_group_desc *desc);
1334 #define ext4_free_blocks_after_init(sb, group, desc) \
1335 ext4_init_block_bitmap(sb, NULL, group, desc)
1338 extern int ext4_check_dir_entry(const char *, struct inode *,
1339 struct ext4_dir_entry_2 *,
1340 struct buffer_head *, unsigned int);
1341 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1343 struct ext4_dir_entry_2 *dirent);
1344 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1347 extern int ext4_sync_file(struct file *, struct dentry *, int);
1350 extern int ext4fs_dirhash(const char *name, int len, struct
1351 dx_hash_info *hinfo);
1354 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1355 const struct qstr *qstr, __u32 goal);
1356 extern void ext4_free_inode(handle_t *, struct inode *);
1357 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1358 extern unsigned long ext4_count_free_inodes(struct super_block *);
1359 extern unsigned long ext4_count_dirs(struct super_block *);
1360 extern void ext4_check_inodes_bitmap(struct super_block *);
1361 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1362 struct buffer_head *bh,
1364 struct ext4_group_desc *desc);
1365 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1368 extern long ext4_mb_stats;
1369 extern long ext4_mb_max_to_scan;
1370 extern int ext4_mb_init(struct super_block *, int);
1371 extern int ext4_mb_release(struct super_block *);
1372 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1373 struct ext4_allocation_request *, int *);
1374 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1375 extern void ext4_discard_preallocations(struct inode *);
1376 extern int __init init_ext4_mballoc(void);
1377 extern void exit_ext4_mballoc(void);
1378 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1379 ext4_fsblk_t, unsigned long, int, unsigned long *);
1380 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1381 ext4_group_t i, struct ext4_group_desc *desc);
1382 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1383 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1386 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1387 struct buffer_head *bh, ext4_fsblk_t blocknr);
1388 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1389 ext4_lblk_t, int, int *);
1390 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1391 ext4_lblk_t, int, int *);
1392 int ext4_get_block(struct inode *inode, sector_t iblock,
1393 struct buffer_head *bh_result, int create);
1395 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1396 extern int ext4_write_inode(struct inode *, int);
1397 extern int ext4_setattr(struct dentry *, struct iattr *);
1398 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1399 struct kstat *stat);
1400 extern void ext4_delete_inode(struct inode *);
1401 extern int ext4_sync_inode(handle_t *, struct inode *);
1402 extern void ext4_dirty_inode(struct inode *);
1403 extern int ext4_change_inode_journal_flag(struct inode *, int);
1404 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1405 extern int ext4_can_truncate(struct inode *inode);
1406 extern void ext4_truncate(struct inode *);
1407 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1408 extern void ext4_set_inode_flags(struct inode *);
1409 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1410 extern int ext4_alloc_da_blocks(struct inode *inode);
1411 extern void ext4_set_aops(struct inode *inode);
1412 extern int ext4_writepage_trans_blocks(struct inode *);
1413 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1414 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1415 extern int ext4_block_truncate_page(handle_t *handle,
1416 struct address_space *mapping, loff_t from);
1417 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1418 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1421 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1422 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1425 extern int ext4_ext_migrate(struct inode *);
1428 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1429 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1430 extern int ext4_orphan_add(handle_t *, struct inode *);
1431 extern int ext4_orphan_del(handle_t *, struct inode *);
1432 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1433 __u32 start_minor_hash, __u32 *next_hash);
1436 extern int ext4_group_add(struct super_block *sb,
1437 struct ext4_new_group_data *input);
1438 extern int ext4_group_extend(struct super_block *sb,
1439 struct ext4_super_block *es,
1440 ext4_fsblk_t n_blocks_count);
1443 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1444 __attribute__ ((format (printf, 3, 4)));
1445 extern void __ext4_std_error(struct super_block *, const char *, int);
1446 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1447 __attribute__ ((format (printf, 3, 4)));
1448 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1449 __attribute__ ((format (printf, 3, 4)));
1450 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1451 __attribute__ ((format (printf, 3, 4)));
1452 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1453 const char *, const char *, ...)
1454 __attribute__ ((format (printf, 4, 5)));
1455 extern void ext4_update_dynamic_rev(struct super_block *sb);
1456 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1458 extern int ext4_update_rocompat_feature(handle_t *handle,
1459 struct super_block *sb, __u32 rocompat);
1460 extern int ext4_update_incompat_feature(handle_t *handle,
1461 struct super_block *sb, __u32 incompat);
1462 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1463 struct ext4_group_desc *bg);
1464 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1465 struct ext4_group_desc *bg);
1466 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1467 struct ext4_group_desc *bg);
1468 extern __u32 ext4_free_blks_count(struct super_block *sb,
1469 struct ext4_group_desc *bg);
1470 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1471 struct ext4_group_desc *bg);
1472 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1473 struct ext4_group_desc *bg);
1474 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1475 struct ext4_group_desc *bg);
1476 extern void ext4_block_bitmap_set(struct super_block *sb,
1477 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1478 extern void ext4_inode_bitmap_set(struct super_block *sb,
1479 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1480 extern void ext4_inode_table_set(struct super_block *sb,
1481 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1482 extern void ext4_free_blks_set(struct super_block *sb,
1483 struct ext4_group_desc *bg, __u32 count);
1484 extern void ext4_free_inodes_set(struct super_block *sb,
1485 struct ext4_group_desc *bg, __u32 count);
1486 extern void ext4_used_dirs_set(struct super_block *sb,
1487 struct ext4_group_desc *bg, __u32 count);
1488 extern void ext4_itable_unused_set(struct super_block *sb,
1489 struct ext4_group_desc *bg, __u32 count);
1490 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1491 struct ext4_group_desc *gdp);
1492 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1493 struct ext4_group_desc *gdp);
1495 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1497 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1498 le32_to_cpu(es->s_blocks_count_lo);
1501 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1503 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1504 le32_to_cpu(es->s_r_blocks_count_lo);
1507 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1509 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1510 le32_to_cpu(es->s_free_blocks_count_lo);
1513 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1516 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1517 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1520 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1523 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1524 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1527 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1530 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1531 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1534 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1536 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1537 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1538 le32_to_cpu(raw_inode->i_size_lo);
1540 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1543 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1545 raw_inode->i_size_lo = cpu_to_le32(i_size);
1546 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1550 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1553 struct ext4_group_info ***grp_info;
1554 long indexv, indexh;
1555 grp_info = EXT4_SB(sb)->s_group_info;
1556 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1557 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1558 return grp_info[indexv][indexh];
1562 * Reading s_groups_count requires using smp_rmb() afterwards. See
1563 * the locking protocol documented in the comments of ext4_group_add()
1566 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1568 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1574 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1575 ext4_group_t block_group)
1577 return block_group >> sbi->s_log_groups_per_flex;
1580 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1582 return 1 << sbi->s_log_groups_per_flex;
1585 #define ext4_std_error(sb, errno) \
1588 __ext4_std_error((sb), __func__, (errno)); \
1592 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1593 * counters. So we need to make sure we have free blocks more
1594 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1596 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1598 #define EXT4_FREEBLOCKS_WATERMARK 0
1601 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1604 * XXX: replace with spinlock if seen contended -bzzz
1606 down_write(&EXT4_I(inode)->i_data_sem);
1607 if (newsize > EXT4_I(inode)->i_disksize)
1608 EXT4_I(inode)->i_disksize = newsize;
1609 up_write(&EXT4_I(inode)->i_data_sem);
1613 struct ext4_group_info {
1614 unsigned long bb_state;
1615 struct rb_root bb_free_root;
1616 ext4_grpblk_t bb_first_free; /* first free block */
1617 ext4_grpblk_t bb_free; /* total free blocks */
1618 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
1619 struct list_head bb_prealloc_list;
1623 struct rw_semaphore alloc_sem;
1624 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1625 * regions, index is order.
1626 * bb_counters[3] = 5 means
1627 * 5 free 8-block regions. */
1630 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1632 #define EXT4_MB_GRP_NEED_INIT(grp) \
1633 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1635 #define EXT4_MAX_CONTENTION 8
1636 #define EXT4_CONTENTION_THRESHOLD 2
1638 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1641 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1645 * Returns true if the filesystem is busy enough that attempts to
1646 * access the block group locks has run into contention.
1648 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1650 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1653 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1655 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1656 if (spin_trylock(lock))
1658 * We're able to grab the lock right away, so drop the
1659 * lock contention counter.
1661 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1664 * The lock is busy, so bump the contention counter,
1665 * and then wait on the spin lock.
1667 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1668 EXT4_MAX_CONTENTION);
1673 static inline void ext4_unlock_group(struct super_block *sb,
1676 spin_unlock(ext4_group_lock_ptr(sb, group));
1680 * Inodes and files operations
1684 extern const struct file_operations ext4_dir_operations;
1687 extern const struct inode_operations ext4_file_inode_operations;
1688 extern const struct file_operations ext4_file_operations;
1691 extern const struct inode_operations ext4_dir_inode_operations;
1692 extern const struct inode_operations ext4_special_inode_operations;
1693 extern struct dentry *ext4_get_parent(struct dentry *child);
1696 extern const struct inode_operations ext4_symlink_inode_operations;
1697 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1699 /* block_validity */
1700 extern void ext4_release_system_zone(struct super_block *sb);
1701 extern int ext4_setup_system_zone(struct super_block *sb);
1702 extern int __init init_ext4_system_zone(void);
1703 extern void exit_ext4_system_zone(void);
1704 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1705 ext4_fsblk_t start_blk,
1706 unsigned int count);
1709 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1710 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1711 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1713 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1714 ext4_lblk_t iblock, unsigned int max_blocks,
1715 struct buffer_head *bh_result, int flags);
1716 extern void ext4_ext_truncate(struct inode *);
1717 extern void ext4_ext_init(struct super_block *);
1718 extern void ext4_ext_release(struct super_block *);
1719 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1721 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
1723 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1724 sector_t block, unsigned int max_blocks,
1725 struct buffer_head *bh, int flags);
1726 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1727 __u64 start, __u64 len);
1729 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1730 __u64 start_orig, __u64 start_donor,
1731 __u64 len, __u64 *moved_len);
1735 * Add new method to test wether block and inode bitmaps are properly
1736 * initialized. With uninit_bg reading the block from disk is not enough
1737 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1739 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1741 static inline int bitmap_uptodate(struct buffer_head *bh)
1743 return (buffer_uptodate(bh) &&
1744 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1746 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1748 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1751 #endif /* __KERNEL__ */
1753 #endif /* _EXT4_H */