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;
130 #define DIO_AIO_UNWRITTEN 0x1
131 typedef struct ext4_io_end {
132 struct list_head list; /* per-file finished AIO list */
133 struct inode *inode; /* file being written to */
134 unsigned int flag; /* unwritten or not */
135 int error; /* I/O error code */
136 ext4_lblk_t offset; /* offset in the file */
137 size_t size; /* size of the extent */
138 struct work_struct work; /* data work queue */
142 * Special inodes numbers
144 #define EXT4_BAD_INO 1 /* Bad blocks inode */
145 #define EXT4_ROOT_INO 2 /* Root inode */
146 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
147 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
148 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
149 #define EXT4_JOURNAL_INO 8 /* Journal inode */
151 /* First non-reserved inode for old ext4 filesystems */
152 #define EXT4_GOOD_OLD_FIRST_INO 11
155 * Maximal count of links to a file
157 #define EXT4_LINK_MAX 65000
160 * Macro-instructions used to manage several block sizes
162 #define EXT4_MIN_BLOCK_SIZE 1024
163 #define EXT4_MAX_BLOCK_SIZE 65536
164 #define EXT4_MIN_BLOCK_LOG_SIZE 10
166 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
168 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
170 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
172 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
174 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
177 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
178 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
179 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
181 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
182 EXT4_GOOD_OLD_INODE_SIZE : \
184 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
185 EXT4_GOOD_OLD_FIRST_INO : \
188 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
191 * Structure of a blocks group descriptor
193 struct ext4_group_desc
195 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
196 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
197 __le32 bg_inode_table_lo; /* Inodes table block */
198 __le16 bg_free_blocks_count_lo;/* Free blocks count */
199 __le16 bg_free_inodes_count_lo;/* Free inodes count */
200 __le16 bg_used_dirs_count_lo; /* Directories count */
201 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
202 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
203 __le16 bg_itable_unused_lo; /* Unused inodes count */
204 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
205 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
206 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
207 __le32 bg_inode_table_hi; /* Inodes table block MSB */
208 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
209 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
210 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
211 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
212 __u32 bg_reserved2[3];
216 * Structure of a flex block group info
220 atomic_t free_inodes;
221 atomic_t free_blocks;
225 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
226 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
227 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
230 * Macro-instructions used to manage group descriptors
232 #define EXT4_MIN_DESC_SIZE 32
233 #define EXT4_MIN_DESC_SIZE_64BIT 64
234 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
235 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
237 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
238 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
239 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
240 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
242 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
243 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
244 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
248 * Constants relative to the data blocks
250 #define EXT4_NDIR_BLOCKS 12
251 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
252 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
253 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
254 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
259 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
260 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
261 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
262 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
263 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
264 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
265 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
266 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
267 /* Reserved for compression usage... */
268 #define EXT4_DIRTY_FL 0x00000100
269 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
270 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
271 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
272 /* End compression flags --- maybe not all used */
273 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
274 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
275 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
276 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
277 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
278 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
279 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
280 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
281 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
283 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
284 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
286 /* Flags that should be inherited by new inodes from their parent. */
287 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
288 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
289 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
290 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
291 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
293 /* Flags that are appropriate for regular files (all but dir-specific ones). */
294 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
296 /* Flags that are appropriate for non-directories/regular files. */
297 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
299 /* Mask out flags that are inappropriate for the given type of inode. */
300 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
304 else if (S_ISREG(mode))
305 return flags & EXT4_REG_FLMASK;
307 return flags & EXT4_OTHER_FLMASK;
311 * Inode dynamic state flags
313 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
314 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
315 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
316 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
317 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
318 #define EXT4_STATE_EXT_MIGRATE 0x00000020 /* Inode is migrating */
320 /* Used to pass group descriptor data when online resize is done */
321 struct ext4_new_group_input {
322 __u32 group; /* Group number for this data */
323 __u64 block_bitmap; /* Absolute block number of block bitmap */
324 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
325 __u64 inode_table; /* Absolute block number of inode table start */
326 __u32 blocks_count; /* Total number of blocks in this group */
327 __u16 reserved_blocks; /* Number of reserved blocks in this group */
331 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
332 struct ext4_new_group_data {
338 __u16 reserved_blocks;
340 __u32 free_blocks_count;
344 * Flags used by ext4_get_blocks()
346 /* Allocate any needed blocks and/or convert an unitialized
347 extent to be an initialized ext4 */
348 #define EXT4_GET_BLOCKS_CREATE 0x0001
349 /* Request the creation of an unitialized extent */
350 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
351 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
352 EXT4_GET_BLOCKS_CREATE)
353 /* Caller is from the delayed allocation writeout path,
354 so set the magic i_delalloc_reserve_flag after taking the
355 inode allocation semaphore for */
356 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
357 /* Call ext4_da_update_reserve_space() after successfully
358 allocating the blocks */
359 #define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0008
360 /* caller is from the direct IO path, request to creation of an
361 unitialized extents if not allocated, split the uninitialized
362 extent if blocks has been preallocated already*/
363 #define EXT4_GET_BLOCKS_DIO 0x0010
364 #define EXT4_GET_BLOCKS_CONVERT 0x0020
365 #define EXT4_GET_BLOCKS_DIO_CREATE_EXT (EXT4_GET_BLOCKS_DIO|\
366 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
367 /* Convert extent to initialized after direct IO complete */
368 #define EXT4_GET_BLOCKS_DIO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
369 EXT4_GET_BLOCKS_DIO_CREATE_EXT)
374 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
375 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
376 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
377 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
378 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
379 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
380 #ifdef CONFIG_JBD2_DEBUG
381 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
383 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
384 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
385 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
386 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
387 #define EXT4_IOC_MIGRATE _IO('f', 9)
388 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
389 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
390 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
391 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
394 * ioctl commands in 32 bit emulation
396 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
397 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
398 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
399 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
400 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
401 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
402 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
403 #ifdef CONFIG_JBD2_DEBUG
404 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
406 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
407 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
413 struct ext4_mount_options {
414 unsigned long s_mount_opt;
417 unsigned long s_commit_interval;
418 u32 s_min_batch_time, s_max_batch_time;
421 char *s_qf_names[MAXQUOTAS];
425 /* Max physical block we can addres w/o extents */
426 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
429 * Structure of an inode on the disk
432 __le16 i_mode; /* File mode */
433 __le16 i_uid; /* Low 16 bits of Owner Uid */
434 __le32 i_size_lo; /* Size in bytes */
435 __le32 i_atime; /* Access time */
436 __le32 i_ctime; /* Inode Change time */
437 __le32 i_mtime; /* Modification time */
438 __le32 i_dtime; /* Deletion Time */
439 __le16 i_gid; /* Low 16 bits of Group Id */
440 __le16 i_links_count; /* Links count */
441 __le32 i_blocks_lo; /* Blocks count */
442 __le32 i_flags; /* File flags */
448 __u32 h_i_translator;
453 } osd1; /* OS dependent 1 */
454 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
455 __le32 i_generation; /* File version (for NFS) */
456 __le32 i_file_acl_lo; /* File ACL */
458 __le32 i_obso_faddr; /* Obsoleted fragment address */
461 __le16 l_i_blocks_high; /* were l_i_reserved1 */
462 __le16 l_i_file_acl_high;
463 __le16 l_i_uid_high; /* these 2 fields */
464 __le16 l_i_gid_high; /* were reserved2[0] */
468 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
475 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
476 __le16 m_i_file_acl_high;
477 __u32 m_i_reserved2[2];
479 } osd2; /* OS dependent 2 */
480 __le16 i_extra_isize;
482 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
483 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
484 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
485 __le32 i_crtime; /* File Creation time */
486 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
487 __le32 i_version_hi; /* high 32 bits for 64-bit version */
491 __u32 reserved; /* should be zero */
492 __u32 donor_fd; /* donor file descriptor */
493 __u64 orig_start; /* logical start offset in block for orig */
494 __u64 donor_start; /* logical start offset in block for donor */
495 __u64 len; /* block length to be moved */
496 __u64 moved_len; /* moved block length */
499 #define EXT4_EPOCH_BITS 2
500 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
501 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
504 * Extended fields will fit into an inode if the filesystem was formatted
505 * with large inodes (-I 256 or larger) and there are not currently any EAs
506 * consuming all of the available space. For new inodes we always reserve
507 * enough space for the kernel's known extended fields, but for inodes
508 * created with an old kernel this might not have been the case. None of
509 * the extended inode fields is critical for correct filesystem operation.
510 * This macro checks if a certain field fits in the inode. Note that
511 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
513 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
514 ((offsetof(typeof(*ext4_inode), field) + \
515 sizeof((ext4_inode)->field)) \
516 <= (EXT4_GOOD_OLD_INODE_SIZE + \
517 (einode)->i_extra_isize)) \
519 static inline __le32 ext4_encode_extra_time(struct timespec *time)
521 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
522 time->tv_sec >> 32 : 0) |
523 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
526 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
528 if (sizeof(time->tv_sec) > 4)
529 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
531 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
534 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
536 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
537 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
538 (raw_inode)->xtime ## _extra = \
539 ext4_encode_extra_time(&(inode)->xtime); \
542 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
544 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
545 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
546 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
547 (raw_inode)->xtime ## _extra = \
548 ext4_encode_extra_time(&(einode)->xtime); \
551 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
553 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
554 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
555 ext4_decode_extra_time(&(inode)->xtime, \
556 raw_inode->xtime ## _extra); \
559 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
561 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
562 (einode)->xtime.tv_sec = \
563 (signed)le32_to_cpu((raw_inode)->xtime); \
564 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
565 ext4_decode_extra_time(&(einode)->xtime, \
566 raw_inode->xtime ## _extra); \
569 #define i_disk_version osd1.linux1.l_i_version
571 #if defined(__KERNEL__) || defined(__linux__)
572 #define i_reserved1 osd1.linux1.l_i_reserved1
573 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
574 #define i_blocks_high osd2.linux2.l_i_blocks_high
575 #define i_uid_low i_uid
576 #define i_gid_low i_gid
577 #define i_uid_high osd2.linux2.l_i_uid_high
578 #define i_gid_high osd2.linux2.l_i_gid_high
579 #define i_reserved2 osd2.linux2.l_i_reserved2
581 #elif defined(__GNU__)
583 #define i_translator osd1.hurd1.h_i_translator
584 #define i_uid_high osd2.hurd2.h_i_uid_high
585 #define i_gid_high osd2.hurd2.h_i_gid_high
586 #define i_author osd2.hurd2.h_i_author
588 #elif defined(__masix__)
590 #define i_reserved1 osd1.masix1.m_i_reserved1
591 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
592 #define i_reserved2 osd2.masix2.m_i_reserved2
594 #endif /* defined(__KERNEL__) || defined(__linux__) */
597 * storage for cached extent
599 struct ext4_ext_cache {
600 ext4_fsblk_t ec_start;
601 ext4_lblk_t ec_block;
602 __u32 ec_len; /* must be 32bit to return holes */
607 * fourth extended file system inode data in memory
609 struct ext4_inode_info {
610 __le32 i_data[15]; /* unconverted */
612 ext4_fsblk_t i_file_acl;
616 * i_block_group is the number of the block group which contains
617 * this file's inode. Constant across the lifetime of the inode,
618 * it is ued for making block allocation decisions - we try to
619 * place a file's data blocks near its inode block, and new inodes
620 * near to their parent directory's inode.
622 ext4_group_t i_block_group;
623 __u32 i_state; /* Dynamic state flags for ext4 */
625 ext4_lblk_t i_dir_start_lookup;
626 #ifdef CONFIG_EXT4_FS_XATTR
628 * Extended attributes can be read independently of the main file
629 * data. Taking i_mutex even when reading would cause contention
630 * between readers of EAs and writers of regular file data, so
631 * instead we synchronize on xattr_sem when reading or changing
634 struct rw_semaphore xattr_sem;
637 struct list_head i_orphan; /* unlinked but open inodes */
640 * i_disksize keeps track of what the inode size is ON DISK, not
641 * in memory. During truncate, i_size is set to the new size by
642 * the VFS prior to calling ext4_truncate(), but the filesystem won't
643 * set i_disksize to 0 until the truncate is actually under way.
645 * The intent is that i_disksize always represents the blocks which
646 * are used by this file. This allows recovery to restart truncate
647 * on orphans if we crash during truncate. We actually write i_disksize
648 * into the on-disk inode when writing inodes out, instead of i_size.
650 * The only time when i_disksize and i_size may be different is when
651 * a truncate is in progress. The only things which change i_disksize
652 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
657 * i_data_sem is for serialising ext4_truncate() against
658 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
659 * data tree are chopped off during truncate. We can't do that in
660 * ext4 because whenever we perform intermediate commits during
661 * truncate, the inode and all the metadata blocks *must* be in a
662 * consistent state which allows truncation of the orphans to restart
663 * during recovery. Hence we must fix the get_block-vs-truncate race
664 * by other means, so we have i_data_sem.
666 struct rw_semaphore i_data_sem;
667 struct inode vfs_inode;
668 struct jbd2_inode jinode;
670 struct ext4_ext_cache i_cached_extent;
672 * File creation time. Its function is same as that of
673 * struct timespec i_{a,c,m}time in the generic inode.
675 struct timespec i_crtime;
678 struct list_head i_prealloc_list;
679 spinlock_t i_prealloc_lock;
682 ext4_group_t i_last_alloc_group;
684 /* allocation reservation info for delalloc */
685 unsigned int i_reserved_data_blocks;
686 unsigned int i_reserved_meta_blocks;
687 unsigned int i_allocated_meta_blocks;
688 unsigned short i_delalloc_reserved_flag;
690 /* on-disk additional length */
693 spinlock_t i_block_reservation_lock;
695 /* completed async DIOs that might need unwritten extents handling */
696 struct list_head i_aio_dio_complete_list;
697 /* current io_end structure for async DIO write*/
698 ext4_io_end_t *cur_aio_dio;
704 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
705 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
706 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
709 * Misc. filesystem flags
711 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
712 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
713 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
718 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
719 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
720 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
721 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
722 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
723 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
724 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
725 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
726 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
727 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
728 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
729 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
730 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
731 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
732 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
733 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
734 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
735 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
736 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
737 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
738 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
739 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
740 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
741 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
742 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
743 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
744 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
746 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
747 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
748 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
751 #define ext4_set_bit ext2_set_bit
752 #define ext4_set_bit_atomic ext2_set_bit_atomic
753 #define ext4_clear_bit ext2_clear_bit
754 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
755 #define ext4_test_bit ext2_test_bit
756 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
757 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
758 #define ext4_find_next_bit ext2_find_next_bit
761 * Maximal mount counts between two filesystem checks
763 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
764 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
767 * Behaviour when detecting errors
769 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
770 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
771 #define EXT4_ERRORS_PANIC 3 /* Panic */
772 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
775 * Structure of the super block
777 struct ext4_super_block {
778 /*00*/ __le32 s_inodes_count; /* Inodes count */
779 __le32 s_blocks_count_lo; /* Blocks count */
780 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
781 __le32 s_free_blocks_count_lo; /* Free blocks count */
782 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
783 __le32 s_first_data_block; /* First Data Block */
784 __le32 s_log_block_size; /* Block size */
785 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
786 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
787 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
788 __le32 s_inodes_per_group; /* # Inodes per group */
789 __le32 s_mtime; /* Mount time */
790 /*30*/ __le32 s_wtime; /* Write time */
791 __le16 s_mnt_count; /* Mount count */
792 __le16 s_max_mnt_count; /* Maximal mount count */
793 __le16 s_magic; /* Magic signature */
794 __le16 s_state; /* File system state */
795 __le16 s_errors; /* Behaviour when detecting errors */
796 __le16 s_minor_rev_level; /* minor revision level */
797 /*40*/ __le32 s_lastcheck; /* time of last check */
798 __le32 s_checkinterval; /* max. time between checks */
799 __le32 s_creator_os; /* OS */
800 __le32 s_rev_level; /* Revision level */
801 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
802 __le16 s_def_resgid; /* Default gid for reserved blocks */
804 * These fields are for EXT4_DYNAMIC_REV superblocks only.
806 * Note: the difference between the compatible feature set and
807 * the incompatible feature set is that if there is a bit set
808 * in the incompatible feature set that the kernel doesn't
809 * know about, it should refuse to mount the filesystem.
811 * e2fsck's requirements are more strict; if it doesn't know
812 * about a feature in either the compatible or incompatible
813 * feature set, it must abort and not try to meddle with
814 * things it doesn't understand...
816 __le32 s_first_ino; /* First non-reserved inode */
817 __le16 s_inode_size; /* size of inode structure */
818 __le16 s_block_group_nr; /* block group # of this superblock */
819 __le32 s_feature_compat; /* compatible feature set */
820 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
821 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
822 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
823 /*78*/ char s_volume_name[16]; /* volume name */
824 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
825 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
827 * Performance hints. Directory preallocation should only
828 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
830 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
831 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
832 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
834 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
836 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
837 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
838 __le32 s_journal_dev; /* device number of journal file */
839 __le32 s_last_orphan; /* start of list of inodes to delete */
840 __le32 s_hash_seed[4]; /* HTREE hash seed */
841 __u8 s_def_hash_version; /* Default hash version to use */
842 __u8 s_reserved_char_pad;
843 __le16 s_desc_size; /* size of group descriptor */
844 /*100*/ __le32 s_default_mount_opts;
845 __le32 s_first_meta_bg; /* First metablock block group */
846 __le32 s_mkfs_time; /* When the filesystem was created */
847 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
848 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
849 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
850 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
851 __le32 s_free_blocks_count_hi; /* Free blocks count */
852 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
853 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
854 __le32 s_flags; /* Miscellaneous flags */
855 __le16 s_raid_stride; /* RAID stride */
856 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
857 __le64 s_mmp_block; /* Block for multi-mount protection */
858 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
859 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
860 __u8 s_reserved_char_pad2;
861 __le16 s_reserved_pad;
862 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
863 __u32 s_reserved[160]; /* Padding to the end of the block */
869 * run-time mount flags
871 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
872 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
875 * fourth extended-fs super-block data in memory
877 struct ext4_sb_info {
878 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
879 unsigned long s_inodes_per_block;/* Number of inodes per block */
880 unsigned long s_blocks_per_group;/* Number of blocks in a group */
881 unsigned long s_inodes_per_group;/* Number of inodes in a group */
882 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
883 unsigned long s_gdb_count; /* Number of group descriptor blocks */
884 unsigned long s_desc_per_block; /* Number of group descriptors per block */
885 ext4_group_t s_groups_count; /* Number of groups in the fs */
886 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
887 unsigned long s_overhead_last; /* Last calculated overhead */
888 unsigned long s_blocks_last; /* Last seen block count */
889 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
890 struct buffer_head * s_sbh; /* Buffer containing the super block */
891 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
892 struct buffer_head **s_group_desc;
893 unsigned int s_mount_opt;
894 unsigned int s_mount_flags;
895 ext4_fsblk_t s_sb_block;
898 unsigned short s_mount_state;
899 unsigned short s_pad;
900 int s_addr_per_block_bits;
901 int s_desc_per_block_bits;
904 unsigned int s_inode_readahead_blks;
905 unsigned int s_inode_goal;
906 spinlock_t s_next_gen_lock;
907 u32 s_next_generation;
909 int s_def_hash_version;
910 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
911 struct percpu_counter s_freeblocks_counter;
912 struct percpu_counter s_freeinodes_counter;
913 struct percpu_counter s_dirs_counter;
914 struct percpu_counter s_dirtyblocks_counter;
915 struct blockgroup_lock *s_blockgroup_lock;
916 struct proc_dir_entry *s_proc;
917 struct kobject s_kobj;
918 struct completion s_kobj_unregister;
921 struct inode *s_journal_inode;
922 struct journal_s *s_journal;
923 struct list_head s_orphan;
924 struct mutex s_orphan_lock;
925 struct mutex s_resize_lock;
926 unsigned long s_commit_interval;
927 u32 s_max_batch_time;
928 u32 s_min_batch_time;
929 struct block_device *journal_bdev;
930 #ifdef CONFIG_JBD2_DEBUG
931 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
932 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
935 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
936 int s_jquota_fmt; /* Format of quota to use */
938 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
939 struct rb_root system_blks;
942 /* ext4 extents stats */
943 unsigned long s_ext_min;
944 unsigned long s_ext_max;
945 unsigned long s_depth_max;
946 spinlock_t s_ext_stats_lock;
947 unsigned long s_ext_blocks;
948 unsigned long s_ext_extents;
951 /* for buddy allocator */
952 struct ext4_group_info ***s_group_info;
953 struct inode *s_buddy_cache;
954 long s_blocks_reserved;
955 spinlock_t s_reserve_lock;
956 spinlock_t s_md_lock;
957 tid_t s_last_transaction;
958 unsigned short *s_mb_offsets;
959 unsigned int *s_mb_maxs;
962 unsigned long s_stripe;
963 unsigned int s_mb_stream_request;
964 unsigned int s_mb_max_to_scan;
965 unsigned int s_mb_min_to_scan;
966 unsigned int s_mb_stats;
967 unsigned int s_mb_order2_reqs;
968 unsigned int s_mb_group_prealloc;
969 unsigned int s_max_writeback_mb_bump;
970 /* where last allocation was done - for stream allocation */
971 unsigned long s_mb_last_group;
972 unsigned long s_mb_last_start;
974 /* history to debug policy */
975 struct ext4_mb_history *s_mb_history;
976 int s_mb_history_cur;
977 int s_mb_history_max;
978 int s_mb_history_num;
979 spinlock_t s_mb_history_lock;
980 int s_mb_history_filter;
982 /* stats for buddy allocator */
983 spinlock_t s_mb_pa_lock;
984 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
985 atomic_t s_bal_success; /* we found long enough chunks */
986 atomic_t s_bal_allocated; /* in blocks */
987 atomic_t s_bal_ex_scanned; /* total extents scanned */
988 atomic_t s_bal_goals; /* goal hits */
989 atomic_t s_bal_breaks; /* too long searches */
990 atomic_t s_bal_2orders; /* 2^order hits */
991 spinlock_t s_bal_lock;
992 unsigned long s_mb_buddies_generated;
993 unsigned long long s_mb_generation_time;
994 atomic_t s_mb_lost_chunks;
995 atomic_t s_mb_preallocated;
996 atomic_t s_mb_discarded;
997 atomic_t s_lock_busy;
999 /* locality groups */
1000 struct ext4_locality_group *s_locality_groups;
1002 /* for write statistics */
1003 unsigned long s_sectors_written_start;
1004 u64 s_kbytes_written;
1006 unsigned int s_log_groups_per_flex;
1007 struct flex_groups *s_flex_groups;
1009 /* workqueue for dio unwritten */
1010 struct workqueue_struct *dio_unwritten_wq;
1013 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1015 return sb->s_fs_info;
1017 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1019 return container_of(inode, struct ext4_inode_info, vfs_inode);
1022 static inline struct timespec ext4_current_time(struct inode *inode)
1024 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1025 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1028 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1030 return ino == EXT4_ROOT_INO ||
1031 ino == EXT4_JOURNAL_INO ||
1032 ino == EXT4_RESIZE_INO ||
1033 (ino >= EXT4_FIRST_INO(sb) &&
1034 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1037 /* Assume that user mode programs are passing in an ext4fs superblock, not
1038 * a kernel struct super_block. This will allow us to call the feature-test
1039 * macros from user land. */
1040 #define EXT4_SB(sb) (sb)
1043 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1046 * Codes for operating systems
1048 #define EXT4_OS_LINUX 0
1049 #define EXT4_OS_HURD 1
1050 #define EXT4_OS_MASIX 2
1051 #define EXT4_OS_FREEBSD 3
1052 #define EXT4_OS_LITES 4
1057 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1058 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1060 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1061 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1063 #define EXT4_GOOD_OLD_INODE_SIZE 128
1066 * Feature set definitions
1069 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1070 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1071 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1072 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1073 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1074 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1075 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1076 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1077 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1078 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1079 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1080 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1081 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1082 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1083 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1084 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1085 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1086 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1088 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1089 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1090 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1091 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1092 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1093 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1095 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1096 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1097 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1098 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1099 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1100 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1101 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1103 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1104 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1105 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1106 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1107 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1108 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1109 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1110 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1111 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1113 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1114 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1115 EXT4_FEATURE_INCOMPAT_RECOVER| \
1116 EXT4_FEATURE_INCOMPAT_META_BG| \
1117 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1118 EXT4_FEATURE_INCOMPAT_64BIT| \
1119 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1120 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1121 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1122 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1123 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1124 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1125 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1126 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1129 * Default values for user and/or group using reserved blocks
1131 #define EXT4_DEF_RESUID 0
1132 #define EXT4_DEF_RESGID 0
1134 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1137 * Default mount options
1139 #define EXT4_DEFM_DEBUG 0x0001
1140 #define EXT4_DEFM_BSDGROUPS 0x0002
1141 #define EXT4_DEFM_XATTR_USER 0x0004
1142 #define EXT4_DEFM_ACL 0x0008
1143 #define EXT4_DEFM_UID16 0x0010
1144 #define EXT4_DEFM_JMODE 0x0060
1145 #define EXT4_DEFM_JMODE_DATA 0x0020
1146 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1147 #define EXT4_DEFM_JMODE_WBACK 0x0060
1150 * Default journal batch times
1152 #define EXT4_DEF_MIN_BATCH_TIME 0
1153 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1156 * Minimum number of groups in a flexgroup before we separate out
1157 * directories into the first block group of a flexgroup
1159 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1162 * Structure of a directory entry
1164 #define EXT4_NAME_LEN 255
1166 struct ext4_dir_entry {
1167 __le32 inode; /* Inode number */
1168 __le16 rec_len; /* Directory entry length */
1169 __le16 name_len; /* Name length */
1170 char name[EXT4_NAME_LEN]; /* File name */
1174 * The new version of the directory entry. Since EXT4 structures are
1175 * stored in intel byte order, and the name_len field could never be
1176 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1179 struct ext4_dir_entry_2 {
1180 __le32 inode; /* Inode number */
1181 __le16 rec_len; /* Directory entry length */
1182 __u8 name_len; /* Name length */
1184 char name[EXT4_NAME_LEN]; /* File name */
1188 * Ext4 directory file types. Only the low 3 bits are used. The
1189 * other bits are reserved for now.
1191 #define EXT4_FT_UNKNOWN 0
1192 #define EXT4_FT_REG_FILE 1
1193 #define EXT4_FT_DIR 2
1194 #define EXT4_FT_CHRDEV 3
1195 #define EXT4_FT_BLKDEV 4
1196 #define EXT4_FT_FIFO 5
1197 #define EXT4_FT_SOCK 6
1198 #define EXT4_FT_SYMLINK 7
1200 #define EXT4_FT_MAX 8
1203 * EXT4_DIR_PAD defines the directory entries boundaries
1205 * NOTE: It must be a multiple of 4
1207 #define EXT4_DIR_PAD 4
1208 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1209 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1211 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1214 * Hash Tree Directory indexing
1215 * (c) Daniel Phillips, 2001
1218 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1219 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1220 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1221 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1222 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1224 /* Legal values for the dx_root hash_version field: */
1226 #define DX_HASH_LEGACY 0
1227 #define DX_HASH_HALF_MD4 1
1228 #define DX_HASH_TEA 2
1229 #define DX_HASH_LEGACY_UNSIGNED 3
1230 #define DX_HASH_HALF_MD4_UNSIGNED 4
1231 #define DX_HASH_TEA_UNSIGNED 5
1235 /* hash info structure used by the directory hash */
1244 #define EXT4_HTREE_EOF 0x7fffffff
1247 * Control parameters used by ext4_htree_next_block
1249 #define HASH_NB_ALWAYS 1
1253 * Describe an inode's exact location on disk and in memory
1257 struct buffer_head *bh;
1258 unsigned long offset;
1259 ext4_group_t block_group;
1262 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1264 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1268 * This structure is stuffed into the struct file's private_data field
1269 * for directories. It is where we put information so that we can do
1270 * readdir operations in hash tree order.
1272 struct dir_private_info {
1273 struct rb_root root;
1274 struct rb_node *curr_node;
1275 struct fname *extra_fname;
1278 __u32 curr_minor_hash;
1282 /* calculate the first block number of the group */
1283 static inline ext4_fsblk_t
1284 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1286 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1287 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1291 * Special error return code only used by dx_probe() and its callers.
1293 #define ERR_BAD_DX_DIR -75000
1295 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1296 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1298 extern struct proc_dir_entry *ext4_proc_root;
1301 * Function prototypes
1305 * Ok, these declarations are also in <linux/kernel.h> but none of the
1306 * ext4 source programs needs to include it so they are duplicated here.
1308 # define NORET_TYPE /**/
1309 # define ATTRIB_NORET __attribute__((noreturn))
1310 # define NORET_AND noreturn,
1313 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1316 extern unsigned int ext4_block_group(struct super_block *sb,
1317 ext4_fsblk_t blocknr);
1318 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1319 ext4_fsblk_t blocknr);
1320 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1321 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1322 ext4_group_t group);
1323 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1324 ext4_fsblk_t goal, unsigned long *count, int *errp);
1325 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1326 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1327 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1328 ext4_fsblk_t block, unsigned long count, int metadata);
1329 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1330 ext4_fsblk_t block, unsigned long count);
1331 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1332 extern void ext4_check_blocks_bitmap(struct super_block *);
1333 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1334 ext4_group_t block_group,
1335 struct buffer_head ** bh);
1336 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1337 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1338 ext4_group_t block_group);
1339 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1340 struct buffer_head *bh,
1342 struct ext4_group_desc *desc);
1343 #define ext4_free_blocks_after_init(sb, group, desc) \
1344 ext4_init_block_bitmap(sb, NULL, group, desc)
1347 extern int ext4_check_dir_entry(const char *, struct inode *,
1348 struct ext4_dir_entry_2 *,
1349 struct buffer_head *, unsigned int);
1350 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1352 struct ext4_dir_entry_2 *dirent);
1353 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1356 extern int ext4_sync_file(struct file *, struct dentry *, int);
1359 extern int ext4fs_dirhash(const char *name, int len, struct
1360 dx_hash_info *hinfo);
1363 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1364 const struct qstr *qstr, __u32 goal);
1365 extern void ext4_free_inode(handle_t *, struct inode *);
1366 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1367 extern unsigned long ext4_count_free_inodes(struct super_block *);
1368 extern unsigned long ext4_count_dirs(struct super_block *);
1369 extern void ext4_check_inodes_bitmap(struct super_block *);
1370 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1371 struct buffer_head *bh,
1373 struct ext4_group_desc *desc);
1374 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1377 extern long ext4_mb_stats;
1378 extern long ext4_mb_max_to_scan;
1379 extern int ext4_mb_init(struct super_block *, int);
1380 extern int ext4_mb_release(struct super_block *);
1381 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1382 struct ext4_allocation_request *, int *);
1383 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1384 extern void ext4_discard_preallocations(struct inode *);
1385 extern int __init init_ext4_mballoc(void);
1386 extern void exit_ext4_mballoc(void);
1387 extern void ext4_mb_free_blocks(handle_t *, struct inode *,
1388 ext4_fsblk_t, unsigned long, int, unsigned long *);
1389 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1390 ext4_group_t i, struct ext4_group_desc *desc);
1391 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1392 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1395 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
1396 struct buffer_head *bh, ext4_fsblk_t blocknr);
1397 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1398 ext4_lblk_t, int, int *);
1399 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1400 ext4_lblk_t, int, int *);
1401 int ext4_get_block(struct inode *inode, sector_t iblock,
1402 struct buffer_head *bh_result, int create);
1404 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1405 extern int ext4_write_inode(struct inode *, int);
1406 extern int ext4_setattr(struct dentry *, struct iattr *);
1407 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1408 struct kstat *stat);
1409 extern void ext4_delete_inode(struct inode *);
1410 extern int ext4_sync_inode(handle_t *, struct inode *);
1411 extern void ext4_dirty_inode(struct inode *);
1412 extern int ext4_change_inode_journal_flag(struct inode *, int);
1413 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1414 extern int ext4_can_truncate(struct inode *inode);
1415 extern void ext4_truncate(struct inode *);
1416 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1417 extern void ext4_set_inode_flags(struct inode *);
1418 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1419 extern int ext4_alloc_da_blocks(struct inode *inode);
1420 extern void ext4_set_aops(struct inode *inode);
1421 extern int ext4_writepage_trans_blocks(struct inode *);
1422 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1423 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1424 extern int ext4_block_truncate_page(handle_t *handle,
1425 struct address_space *mapping, loff_t from);
1426 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1427 extern qsize_t ext4_get_reserved_space(struct inode *inode);
1428 extern int flush_aio_dio_completed_IO(struct inode *inode);
1430 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1431 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1434 extern int ext4_ext_migrate(struct inode *);
1437 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1438 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1439 extern int ext4_orphan_add(handle_t *, struct inode *);
1440 extern int ext4_orphan_del(handle_t *, struct inode *);
1441 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1442 __u32 start_minor_hash, __u32 *next_hash);
1445 extern int ext4_group_add(struct super_block *sb,
1446 struct ext4_new_group_data *input);
1447 extern int ext4_group_extend(struct super_block *sb,
1448 struct ext4_super_block *es,
1449 ext4_fsblk_t n_blocks_count);
1452 extern void ext4_error(struct super_block *, const char *, const char *, ...)
1453 __attribute__ ((format (printf, 3, 4)));
1454 extern void __ext4_std_error(struct super_block *, const char *, int);
1455 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1456 __attribute__ ((format (printf, 3, 4)));
1457 extern void ext4_warning(struct super_block *, const char *, const char *, ...)
1458 __attribute__ ((format (printf, 3, 4)));
1459 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1460 __attribute__ ((format (printf, 3, 4)));
1461 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1462 const char *, const char *, ...)
1463 __attribute__ ((format (printf, 4, 5)));
1464 extern void ext4_update_dynamic_rev(struct super_block *sb);
1465 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1467 extern int ext4_update_rocompat_feature(handle_t *handle,
1468 struct super_block *sb, __u32 rocompat);
1469 extern int ext4_update_incompat_feature(handle_t *handle,
1470 struct super_block *sb, __u32 incompat);
1471 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1472 struct ext4_group_desc *bg);
1473 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1474 struct ext4_group_desc *bg);
1475 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1476 struct ext4_group_desc *bg);
1477 extern __u32 ext4_free_blks_count(struct super_block *sb,
1478 struct ext4_group_desc *bg);
1479 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1480 struct ext4_group_desc *bg);
1481 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1482 struct ext4_group_desc *bg);
1483 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1484 struct ext4_group_desc *bg);
1485 extern void ext4_block_bitmap_set(struct super_block *sb,
1486 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1487 extern void ext4_inode_bitmap_set(struct super_block *sb,
1488 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1489 extern void ext4_inode_table_set(struct super_block *sb,
1490 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1491 extern void ext4_free_blks_set(struct super_block *sb,
1492 struct ext4_group_desc *bg, __u32 count);
1493 extern void ext4_free_inodes_set(struct super_block *sb,
1494 struct ext4_group_desc *bg, __u32 count);
1495 extern void ext4_used_dirs_set(struct super_block *sb,
1496 struct ext4_group_desc *bg, __u32 count);
1497 extern void ext4_itable_unused_set(struct super_block *sb,
1498 struct ext4_group_desc *bg, __u32 count);
1499 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1500 struct ext4_group_desc *gdp);
1501 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1502 struct ext4_group_desc *gdp);
1504 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1506 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1507 le32_to_cpu(es->s_blocks_count_lo);
1510 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1512 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1513 le32_to_cpu(es->s_r_blocks_count_lo);
1516 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1518 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1519 le32_to_cpu(es->s_free_blocks_count_lo);
1522 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1525 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1526 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1529 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1532 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1533 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1536 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1539 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1540 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1543 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1545 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1546 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1547 le32_to_cpu(raw_inode->i_size_lo);
1549 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1552 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1554 raw_inode->i_size_lo = cpu_to_le32(i_size);
1555 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1559 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1562 struct ext4_group_info ***grp_info;
1563 long indexv, indexh;
1564 grp_info = EXT4_SB(sb)->s_group_info;
1565 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1566 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1567 return grp_info[indexv][indexh];
1571 * Reading s_groups_count requires using smp_rmb() afterwards. See
1572 * the locking protocol documented in the comments of ext4_group_add()
1575 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1577 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1583 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1584 ext4_group_t block_group)
1586 return block_group >> sbi->s_log_groups_per_flex;
1589 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1591 return 1 << sbi->s_log_groups_per_flex;
1594 #define ext4_std_error(sb, errno) \
1597 __ext4_std_error((sb), __func__, (errno)); \
1601 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1602 * counters. So we need to make sure we have free blocks more
1603 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1605 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1607 #define EXT4_FREEBLOCKS_WATERMARK 0
1610 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1613 * XXX: replace with spinlock if seen contended -bzzz
1615 down_write(&EXT4_I(inode)->i_data_sem);
1616 if (newsize > EXT4_I(inode)->i_disksize)
1617 EXT4_I(inode)->i_disksize = newsize;
1618 up_write(&EXT4_I(inode)->i_data_sem);
1622 struct ext4_group_info {
1623 unsigned long bb_state;
1624 struct rb_root bb_free_root;
1625 ext4_grpblk_t bb_first_free; /* first free block */
1626 ext4_grpblk_t bb_free; /* total free blocks */
1627 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
1628 struct list_head bb_prealloc_list;
1632 struct rw_semaphore alloc_sem;
1633 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1634 * regions, index is order.
1635 * bb_counters[3] = 5 means
1636 * 5 free 8-block regions. */
1639 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1641 #define EXT4_MB_GRP_NEED_INIT(grp) \
1642 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1644 #define EXT4_MAX_CONTENTION 8
1645 #define EXT4_CONTENTION_THRESHOLD 2
1647 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1650 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1654 * Returns true if the filesystem is busy enough that attempts to
1655 * access the block group locks has run into contention.
1657 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1659 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1662 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1664 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1665 if (spin_trylock(lock))
1667 * We're able to grab the lock right away, so drop the
1668 * lock contention counter.
1670 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1673 * The lock is busy, so bump the contention counter,
1674 * and then wait on the spin lock.
1676 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1677 EXT4_MAX_CONTENTION);
1682 static inline void ext4_unlock_group(struct super_block *sb,
1685 spin_unlock(ext4_group_lock_ptr(sb, group));
1689 * Inodes and files operations
1693 extern const struct file_operations ext4_dir_operations;
1696 extern const struct inode_operations ext4_file_inode_operations;
1697 extern const struct file_operations ext4_file_operations;
1700 extern const struct inode_operations ext4_dir_inode_operations;
1701 extern const struct inode_operations ext4_special_inode_operations;
1702 extern struct dentry *ext4_get_parent(struct dentry *child);
1705 extern const struct inode_operations ext4_symlink_inode_operations;
1706 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1708 /* block_validity */
1709 extern void ext4_release_system_zone(struct super_block *sb);
1710 extern int ext4_setup_system_zone(struct super_block *sb);
1711 extern int __init init_ext4_system_zone(void);
1712 extern void exit_ext4_system_zone(void);
1713 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1714 ext4_fsblk_t start_blk,
1715 unsigned int count);
1718 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1719 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1720 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1722 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1723 ext4_lblk_t iblock, unsigned int max_blocks,
1724 struct buffer_head *bh_result, int flags);
1725 extern void ext4_ext_truncate(struct inode *);
1726 extern void ext4_ext_init(struct super_block *);
1727 extern void ext4_ext_release(struct super_block *);
1728 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1730 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
1732 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1733 sector_t block, unsigned int max_blocks,
1734 struct buffer_head *bh, int flags);
1735 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1736 __u64 start, __u64 len);
1738 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1739 __u64 start_orig, __u64 start_donor,
1740 __u64 len, __u64 *moved_len);
1744 * Add new method to test wether block and inode bitmaps are properly
1745 * initialized. With uninit_bg reading the block from disk is not enough
1746 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1748 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1750 static inline int bitmap_uptodate(struct buffer_head *bh)
1752 return (buffer_uptodate(bh) &&
1753 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1755 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1757 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1760 #endif /* __KERNEL__ */
1762 #endif /* _EXT4_H */