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 #define EXT4_ERROR_INODE(inode, fmt, a...) \
57 ext4_error_inode(__func__, (inode), (fmt), ## a);
59 #define EXT4_ERROR_FILE(file, fmt, a...) \
60 ext4_error_file(__func__, (file), (fmt), ## a);
62 /* data type for block offset of block group */
63 typedef int ext4_grpblk_t;
65 /* data type for filesystem-wide blocks number */
66 typedef unsigned long long ext4_fsblk_t;
68 /* data type for file logical block number */
69 typedef __u32 ext4_lblk_t;
71 /* data type for block group number */
72 typedef unsigned int ext4_group_t;
75 * Flags used in mballoc's allocation_context flags field.
77 * Also used to show what's going on for debugging purposes when the
78 * flag field is exported via the traceport interface
81 /* prefer goal again. length */
82 #define EXT4_MB_HINT_MERGE 0x0001
83 /* blocks already reserved */
84 #define EXT4_MB_HINT_RESERVED 0x0002
85 /* metadata is being allocated */
86 #define EXT4_MB_HINT_METADATA 0x0004
87 /* first blocks in the file */
88 #define EXT4_MB_HINT_FIRST 0x0008
89 /* search for the best chunk */
90 #define EXT4_MB_HINT_BEST 0x0010
91 /* data is being allocated */
92 #define EXT4_MB_HINT_DATA 0x0020
93 /* don't preallocate (for tails) */
94 #define EXT4_MB_HINT_NOPREALLOC 0x0040
95 /* allocate for locality group */
96 #define EXT4_MB_HINT_GROUP_ALLOC 0x0080
97 /* allocate goal blocks or none */
98 #define EXT4_MB_HINT_GOAL_ONLY 0x0100
99 /* goal is meaningful */
100 #define EXT4_MB_HINT_TRY_GOAL 0x0200
101 /* blocks already pre-reserved by delayed allocation */
102 #define EXT4_MB_DELALLOC_RESERVED 0x0400
103 /* We are doing stream allocation */
104 #define EXT4_MB_STREAM_ALLOC 0x0800
107 struct ext4_allocation_request {
108 /* target inode for block we're allocating */
110 /* how many blocks we want to allocate */
112 /* logical block in target inode */
114 /* the closest logical allocated block to the left */
116 /* the closest logical allocated block to the right */
118 /* phys. target (a hint) */
120 /* phys. block for the closest logical allocated block to the left */
122 /* phys. block for the closest logical allocated block to the right */
124 /* flags. see above EXT4_MB_HINT_* */
129 * Logical to physical block mapping, used by ext4_map_blocks()
131 * This structure is used to pass requests into ext4_map_blocks() as
132 * well as to store the information returned by ext4_map_blocks(). It
133 * takes less room on the stack than a struct buffer_head.
135 #define EXT4_MAP_NEW (1 << BH_New)
136 #define EXT4_MAP_MAPPED (1 << BH_Mapped)
137 #define EXT4_MAP_UNWRITTEN (1 << BH_Unwritten)
138 #define EXT4_MAP_BOUNDARY (1 << BH_Boundary)
139 #define EXT4_MAP_UNINIT (1 << BH_Uninit)
140 #define EXT4_MAP_FLAGS (EXT4_MAP_NEW | EXT4_MAP_MAPPED |\
141 EXT4_MAP_UNWRITTEN | EXT4_MAP_BOUNDARY |\
144 struct ext4_map_blocks {
148 unsigned int m_flags;
152 * For delayed allocation tracking
154 struct mpage_da_data {
156 sector_t b_blocknr; /* start block number of extent */
157 size_t b_size; /* size of extent */
158 unsigned long b_state; /* state of the extent */
159 unsigned long first_page, next_page; /* extent of pages */
160 struct writeback_control *wbc;
165 #define EXT4_IO_UNWRITTEN 0x1
166 typedef struct ext4_io_end {
167 struct list_head list; /* per-file finished AIO list */
168 struct inode *inode; /* file being written to */
169 unsigned int flag; /* unwritten or not */
170 struct page *page; /* page struct for buffer write */
171 loff_t offset; /* offset in the file */
172 ssize_t size; /* size of the extent */
173 struct work_struct work; /* data work queue */
177 * Special inodes numbers
179 #define EXT4_BAD_INO 1 /* Bad blocks inode */
180 #define EXT4_ROOT_INO 2 /* Root inode */
181 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
182 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
183 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
184 #define EXT4_JOURNAL_INO 8 /* Journal inode */
186 /* First non-reserved inode for old ext4 filesystems */
187 #define EXT4_GOOD_OLD_FIRST_INO 11
190 * Maximal count of links to a file
192 #define EXT4_LINK_MAX 65000
195 * Macro-instructions used to manage several block sizes
197 #define EXT4_MIN_BLOCK_SIZE 1024
198 #define EXT4_MAX_BLOCK_SIZE 65536
199 #define EXT4_MIN_BLOCK_LOG_SIZE 10
201 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
203 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
205 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
207 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
209 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
212 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
213 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
214 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
216 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
217 EXT4_GOOD_OLD_INODE_SIZE : \
219 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
220 EXT4_GOOD_OLD_FIRST_INO : \
223 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
226 * Structure of a blocks group descriptor
228 struct ext4_group_desc
230 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
231 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
232 __le32 bg_inode_table_lo; /* Inodes table block */
233 __le16 bg_free_blocks_count_lo;/* Free blocks count */
234 __le16 bg_free_inodes_count_lo;/* Free inodes count */
235 __le16 bg_used_dirs_count_lo; /* Directories count */
236 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
237 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
238 __le16 bg_itable_unused_lo; /* Unused inodes count */
239 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
240 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
241 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
242 __le32 bg_inode_table_hi; /* Inodes table block MSB */
243 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
244 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
245 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
246 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
247 __u32 bg_reserved2[3];
251 * Structure of a flex block group info
255 atomic_t free_inodes;
256 atomic_t free_blocks;
260 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
261 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
262 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
265 * Macro-instructions used to manage group descriptors
267 #define EXT4_MIN_DESC_SIZE 32
268 #define EXT4_MIN_DESC_SIZE_64BIT 64
269 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
270 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
272 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
273 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
274 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
275 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
277 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
278 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
279 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
283 * Constants relative to the data blocks
285 #define EXT4_NDIR_BLOCKS 12
286 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
287 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
288 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
289 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
294 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
295 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
296 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
297 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
298 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
299 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
300 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
301 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
302 /* Reserved for compression usage... */
303 #define EXT4_DIRTY_FL 0x00000100
304 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
305 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
306 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
307 /* End compression flags --- maybe not all used */
308 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
309 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
310 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
311 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
312 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
313 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
314 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
315 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
316 #define EXT4_EA_INODE_FL 0x00200000 /* Inode used for large EA */
317 #define EXT4_EOFBLOCKS_FL 0x00400000 /* Blocks allocated beyond EOF */
318 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
320 #define EXT4_FL_USER_VISIBLE 0x004BDFFF /* User visible flags */
321 #define EXT4_FL_USER_MODIFIABLE 0x004B80FF /* User modifiable flags */
323 /* Flags that should be inherited by new inodes from their parent. */
324 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
325 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
326 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
327 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
328 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
330 /* Flags that are appropriate for regular files (all but dir-specific ones). */
331 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
333 /* Flags that are appropriate for non-directories/regular files. */
334 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
336 /* Mask out flags that are inappropriate for the given type of inode. */
337 static inline __u32 ext4_mask_flags(umode_t mode, __u32 flags)
341 else if (S_ISREG(mode))
342 return flags & EXT4_REG_FLMASK;
344 return flags & EXT4_OTHER_FLMASK;
347 /* Used to pass group descriptor data when online resize is done */
348 struct ext4_new_group_input {
349 __u32 group; /* Group number for this data */
350 __u64 block_bitmap; /* Absolute block number of block bitmap */
351 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
352 __u64 inode_table; /* Absolute block number of inode table start */
353 __u32 blocks_count; /* Total number of blocks in this group */
354 __u16 reserved_blocks; /* Number of reserved blocks in this group */
358 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
359 struct ext4_new_group_data {
365 __u16 reserved_blocks;
367 __u32 free_blocks_count;
371 * Flags used by ext4_get_blocks()
373 /* Allocate any needed blocks and/or convert an unitialized
374 extent to be an initialized ext4 */
375 #define EXT4_GET_BLOCKS_CREATE 0x0001
376 /* Request the creation of an unitialized extent */
377 #define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
378 #define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
379 EXT4_GET_BLOCKS_CREATE)
380 /* Caller is from the delayed allocation writeout path,
381 so set the magic i_delalloc_reserve_flag after taking the
382 inode allocation semaphore for */
383 #define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0004
384 /* caller is from the direct IO path, request to creation of an
385 unitialized extents if not allocated, split the uninitialized
386 extent if blocks has been preallocated already*/
387 #define EXT4_GET_BLOCKS_PRE_IO 0x0008
388 #define EXT4_GET_BLOCKS_CONVERT 0x0010
389 #define EXT4_GET_BLOCKS_IO_CREATE_EXT (EXT4_GET_BLOCKS_PRE_IO|\
390 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
391 /* Convert extent to initialized after IO complete */
392 #define EXT4_GET_BLOCKS_IO_CONVERT_EXT (EXT4_GET_BLOCKS_CONVERT|\
393 EXT4_GET_BLOCKS_CREATE_UNINIT_EXT)
396 * Flags used by ext4_free_blocks
398 #define EXT4_FREE_BLOCKS_METADATA 0x0001
399 #define EXT4_FREE_BLOCKS_FORGET 0x0002
400 #define EXT4_FREE_BLOCKS_VALIDATED 0x0004
405 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
406 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
407 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
408 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
409 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
410 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
411 #ifdef CONFIG_JBD2_DEBUG
412 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
414 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
415 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
416 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
417 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
418 #define EXT4_IOC_MIGRATE _IO('f', 9)
419 /* note ioctl 10 reserved for an early version of the FIEMAP ioctl */
420 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
421 #define EXT4_IOC_ALLOC_DA_BLKS _IO('f', 12)
422 #define EXT4_IOC_MOVE_EXT _IOWR('f', 15, struct move_extent)
425 * ioctl commands in 32 bit emulation
427 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
428 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
429 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
430 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
431 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
432 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
433 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
434 #ifdef CONFIG_JBD2_DEBUG
435 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
437 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
438 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
444 struct ext4_mount_options {
445 unsigned long s_mount_opt;
448 unsigned long s_commit_interval;
449 u32 s_min_batch_time, s_max_batch_time;
452 char *s_qf_names[MAXQUOTAS];
456 /* Max physical block we can addres w/o extents */
457 #define EXT4_MAX_BLOCK_FILE_PHYS 0xFFFFFFFF
460 * Structure of an inode on the disk
463 __le16 i_mode; /* File mode */
464 __le16 i_uid; /* Low 16 bits of Owner Uid */
465 __le32 i_size_lo; /* Size in bytes */
466 __le32 i_atime; /* Access time */
467 __le32 i_ctime; /* Inode Change time */
468 __le32 i_mtime; /* Modification time */
469 __le32 i_dtime; /* Deletion Time */
470 __le16 i_gid; /* Low 16 bits of Group Id */
471 __le16 i_links_count; /* Links count */
472 __le32 i_blocks_lo; /* Blocks count */
473 __le32 i_flags; /* File flags */
479 __u32 h_i_translator;
484 } osd1; /* OS dependent 1 */
485 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
486 __le32 i_generation; /* File version (for NFS) */
487 __le32 i_file_acl_lo; /* File ACL */
489 __le32 i_obso_faddr; /* Obsoleted fragment address */
492 __le16 l_i_blocks_high; /* were l_i_reserved1 */
493 __le16 l_i_file_acl_high;
494 __le16 l_i_uid_high; /* these 2 fields */
495 __le16 l_i_gid_high; /* were reserved2[0] */
499 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
506 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
507 __le16 m_i_file_acl_high;
508 __u32 m_i_reserved2[2];
510 } osd2; /* OS dependent 2 */
511 __le16 i_extra_isize;
513 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
514 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
515 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
516 __le32 i_crtime; /* File Creation time */
517 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
518 __le32 i_version_hi; /* high 32 bits for 64-bit version */
522 __u32 reserved; /* should be zero */
523 __u32 donor_fd; /* donor file descriptor */
524 __u64 orig_start; /* logical start offset in block for orig */
525 __u64 donor_start; /* logical start offset in block for donor */
526 __u64 len; /* block length to be moved */
527 __u64 moved_len; /* moved block length */
530 #define EXT4_EPOCH_BITS 2
531 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
532 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
535 * Extended fields will fit into an inode if the filesystem was formatted
536 * with large inodes (-I 256 or larger) and there are not currently any EAs
537 * consuming all of the available space. For new inodes we always reserve
538 * enough space for the kernel's known extended fields, but for inodes
539 * created with an old kernel this might not have been the case. None of
540 * the extended inode fields is critical for correct filesystem operation.
541 * This macro checks if a certain field fits in the inode. Note that
542 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
544 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
545 ((offsetof(typeof(*ext4_inode), field) + \
546 sizeof((ext4_inode)->field)) \
547 <= (EXT4_GOOD_OLD_INODE_SIZE + \
548 (einode)->i_extra_isize)) \
550 static inline __le32 ext4_encode_extra_time(struct timespec *time)
552 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
553 (time->tv_sec >> 32) & EXT4_EPOCH_MASK : 0) |
554 ((time->tv_nsec << EXT4_EPOCH_BITS) & EXT4_NSEC_MASK));
557 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
559 if (sizeof(time->tv_sec) > 4)
560 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
562 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> EXT4_EPOCH_BITS;
565 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
567 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
568 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
569 (raw_inode)->xtime ## _extra = \
570 ext4_encode_extra_time(&(inode)->xtime); \
573 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
575 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
576 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
577 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
578 (raw_inode)->xtime ## _extra = \
579 ext4_encode_extra_time(&(einode)->xtime); \
582 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
584 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
585 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
586 ext4_decode_extra_time(&(inode)->xtime, \
587 raw_inode->xtime ## _extra); \
590 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
592 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
593 (einode)->xtime.tv_sec = \
594 (signed)le32_to_cpu((raw_inode)->xtime); \
595 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
596 ext4_decode_extra_time(&(einode)->xtime, \
597 raw_inode->xtime ## _extra); \
600 #define i_disk_version osd1.linux1.l_i_version
602 #if defined(__KERNEL__) || defined(__linux__)
603 #define i_reserved1 osd1.linux1.l_i_reserved1
604 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
605 #define i_blocks_high osd2.linux2.l_i_blocks_high
606 #define i_uid_low i_uid
607 #define i_gid_low i_gid
608 #define i_uid_high osd2.linux2.l_i_uid_high
609 #define i_gid_high osd2.linux2.l_i_gid_high
610 #define i_reserved2 osd2.linux2.l_i_reserved2
612 #elif defined(__GNU__)
614 #define i_translator osd1.hurd1.h_i_translator
615 #define i_uid_high osd2.hurd2.h_i_uid_high
616 #define i_gid_high osd2.hurd2.h_i_gid_high
617 #define i_author osd2.hurd2.h_i_author
619 #elif defined(__masix__)
621 #define i_reserved1 osd1.masix1.m_i_reserved1
622 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
623 #define i_reserved2 osd2.masix2.m_i_reserved2
625 #endif /* defined(__KERNEL__) || defined(__linux__) */
628 * storage for cached extent
630 struct ext4_ext_cache {
631 ext4_fsblk_t ec_start;
632 ext4_lblk_t ec_block;
633 __u32 ec_len; /* must be 32bit to return holes */
638 * fourth extended file system inode data in memory
640 struct ext4_inode_info {
641 __le32 i_data[15]; /* unconverted */
643 ext4_fsblk_t i_file_acl;
647 * i_block_group is the number of the block group which contains
648 * this file's inode. Constant across the lifetime of the inode,
649 * it is ued for making block allocation decisions - we try to
650 * place a file's data blocks near its inode block, and new inodes
651 * near to their parent directory's inode.
653 ext4_group_t i_block_group;
654 unsigned long i_state_flags; /* Dynamic state flags */
656 ext4_lblk_t i_dir_start_lookup;
657 #ifdef CONFIG_EXT4_FS_XATTR
659 * Extended attributes can be read independently of the main file
660 * data. Taking i_mutex even when reading would cause contention
661 * between readers of EAs and writers of regular file data, so
662 * instead we synchronize on xattr_sem when reading or changing
665 struct rw_semaphore xattr_sem;
668 struct list_head i_orphan; /* unlinked but open inodes */
671 * i_disksize keeps track of what the inode size is ON DISK, not
672 * in memory. During truncate, i_size is set to the new size by
673 * the VFS prior to calling ext4_truncate(), but the filesystem won't
674 * set i_disksize to 0 until the truncate is actually under way.
676 * The intent is that i_disksize always represents the blocks which
677 * are used by this file. This allows recovery to restart truncate
678 * on orphans if we crash during truncate. We actually write i_disksize
679 * into the on-disk inode when writing inodes out, instead of i_size.
681 * The only time when i_disksize and i_size may be different is when
682 * a truncate is in progress. The only things which change i_disksize
683 * are ext4_get_block (growth) and ext4_truncate (shrinkth).
688 * i_data_sem is for serialising ext4_truncate() against
689 * ext4_getblock(). In the 2.4 ext2 design, great chunks of inode's
690 * data tree are chopped off during truncate. We can't do that in
691 * ext4 because whenever we perform intermediate commits during
692 * truncate, the inode and all the metadata blocks *must* be in a
693 * consistent state which allows truncation of the orphans to restart
694 * during recovery. Hence we must fix the get_block-vs-truncate race
695 * by other means, so we have i_data_sem.
697 struct rw_semaphore i_data_sem;
698 struct inode vfs_inode;
699 struct jbd2_inode jinode;
701 struct ext4_ext_cache i_cached_extent;
703 * File creation time. Its function is same as that of
704 * struct timespec i_{a,c,m}time in the generic inode.
706 struct timespec i_crtime;
709 struct list_head i_prealloc_list;
710 spinlock_t i_prealloc_lock;
713 ext4_group_t i_last_alloc_group;
715 /* allocation reservation info for delalloc */
716 unsigned int i_reserved_data_blocks;
717 unsigned int i_reserved_meta_blocks;
718 unsigned int i_allocated_meta_blocks;
719 unsigned short i_delalloc_reserved_flag;
720 sector_t i_da_metadata_calc_last_lblock;
721 int i_da_metadata_calc_len;
723 /* on-disk additional length */
726 spinlock_t i_block_reservation_lock;
728 /* quota space reservation, managed internally by quota code */
729 qsize_t i_reserved_quota;
732 /* completed IOs that might need unwritten extents handling */
733 struct list_head i_completed_io_list;
734 spinlock_t i_completed_io_lock;
735 /* current io_end structure for async DIO write*/
736 ext4_io_end_t *cur_aio_dio;
739 * Transactions that contain inode's metadata needed to complete
740 * fsync and fdatasync, respectively.
743 tid_t i_datasync_tid;
749 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
750 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
751 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
754 * Misc. filesystem flags
756 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
757 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
758 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
763 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
764 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
765 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
766 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
767 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
768 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
769 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
770 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
771 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
772 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
773 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
774 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
775 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
776 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
777 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
778 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
779 #define EXT4_MOUNT_NO_AUTO_DA_ALLOC 0x10000 /* No auto delalloc mapping */
780 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
781 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
782 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
783 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
784 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
785 #define EXT4_MOUNT_DIOREAD_NOLOCK 0x400000 /* Enable support for dio read nolocking */
786 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
787 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
788 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
789 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
790 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
791 #define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */
792 #define EXT4_MOUNT_DISCARD 0x40000000 /* Issue DISCARD requests */
794 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
795 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
796 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
799 #define ext4_set_bit ext2_set_bit
800 #define ext4_set_bit_atomic ext2_set_bit_atomic
801 #define ext4_clear_bit ext2_clear_bit
802 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
803 #define ext4_test_bit ext2_test_bit
804 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
805 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
806 #define ext4_find_next_bit ext2_find_next_bit
809 * Maximal mount counts between two filesystem checks
811 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
812 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
815 * Behaviour when detecting errors
817 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
818 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
819 #define EXT4_ERRORS_PANIC 3 /* Panic */
820 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
823 * Structure of the super block
825 struct ext4_super_block {
826 /*00*/ __le32 s_inodes_count; /* Inodes count */
827 __le32 s_blocks_count_lo; /* Blocks count */
828 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
829 __le32 s_free_blocks_count_lo; /* Free blocks count */
830 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
831 __le32 s_first_data_block; /* First Data Block */
832 __le32 s_log_block_size; /* Block size */
833 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
834 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
835 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
836 __le32 s_inodes_per_group; /* # Inodes per group */
837 __le32 s_mtime; /* Mount time */
838 /*30*/ __le32 s_wtime; /* Write time */
839 __le16 s_mnt_count; /* Mount count */
840 __le16 s_max_mnt_count; /* Maximal mount count */
841 __le16 s_magic; /* Magic signature */
842 __le16 s_state; /* File system state */
843 __le16 s_errors; /* Behaviour when detecting errors */
844 __le16 s_minor_rev_level; /* minor revision level */
845 /*40*/ __le32 s_lastcheck; /* time of last check */
846 __le32 s_checkinterval; /* max. time between checks */
847 __le32 s_creator_os; /* OS */
848 __le32 s_rev_level; /* Revision level */
849 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
850 __le16 s_def_resgid; /* Default gid for reserved blocks */
852 * These fields are for EXT4_DYNAMIC_REV superblocks only.
854 * Note: the difference between the compatible feature set and
855 * the incompatible feature set is that if there is a bit set
856 * in the incompatible feature set that the kernel doesn't
857 * know about, it should refuse to mount the filesystem.
859 * e2fsck's requirements are more strict; if it doesn't know
860 * about a feature in either the compatible or incompatible
861 * feature set, it must abort and not try to meddle with
862 * things it doesn't understand...
864 __le32 s_first_ino; /* First non-reserved inode */
865 __le16 s_inode_size; /* size of inode structure */
866 __le16 s_block_group_nr; /* block group # of this superblock */
867 __le32 s_feature_compat; /* compatible feature set */
868 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
869 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
870 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
871 /*78*/ char s_volume_name[16]; /* volume name */
872 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
873 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
875 * Performance hints. Directory preallocation should only
876 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
878 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
879 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
880 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
882 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
884 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
885 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
886 __le32 s_journal_dev; /* device number of journal file */
887 __le32 s_last_orphan; /* start of list of inodes to delete */
888 __le32 s_hash_seed[4]; /* HTREE hash seed */
889 __u8 s_def_hash_version; /* Default hash version to use */
890 __u8 s_reserved_char_pad;
891 __le16 s_desc_size; /* size of group descriptor */
892 /*100*/ __le32 s_default_mount_opts;
893 __le32 s_first_meta_bg; /* First metablock block group */
894 __le32 s_mkfs_time; /* When the filesystem was created */
895 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
896 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
897 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
898 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
899 __le32 s_free_blocks_count_hi; /* Free blocks count */
900 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
901 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
902 __le32 s_flags; /* Miscellaneous flags */
903 __le16 s_raid_stride; /* RAID stride */
904 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
905 __le64 s_mmp_block; /* Block for multi-mount protection */
906 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
907 __u8 s_log_groups_per_flex; /* FLEX_BG group size */
908 __u8 s_reserved_char_pad2;
909 __le16 s_reserved_pad;
910 __le64 s_kbytes_written; /* nr of lifetime kilobytes written */
911 __u32 s_reserved[160]; /* Padding to the end of the block */
917 * run-time mount flags
919 #define EXT4_MF_MNTDIR_SAMPLED 0x0001
920 #define EXT4_MF_FS_ABORTED 0x0002 /* Fatal error detected */
923 * fourth extended-fs super-block data in memory
925 struct ext4_sb_info {
926 unsigned long s_desc_size; /* Size of a group descriptor in bytes */
927 unsigned long s_inodes_per_block;/* Number of inodes per block */
928 unsigned long s_blocks_per_group;/* Number of blocks in a group */
929 unsigned long s_inodes_per_group;/* Number of inodes in a group */
930 unsigned long s_itb_per_group; /* Number of inode table blocks per group */
931 unsigned long s_gdb_count; /* Number of group descriptor blocks */
932 unsigned long s_desc_per_block; /* Number of group descriptors per block */
933 ext4_group_t s_groups_count; /* Number of groups in the fs */
934 ext4_group_t s_blockfile_groups;/* Groups acceptable for non-extent files */
935 unsigned long s_overhead_last; /* Last calculated overhead */
936 unsigned long s_blocks_last; /* Last seen block count */
937 loff_t s_bitmap_maxbytes; /* max bytes for bitmap files */
938 struct buffer_head * s_sbh; /* Buffer containing the super block */
939 struct ext4_super_block *s_es; /* Pointer to the super block in the buffer */
940 struct buffer_head **s_group_desc;
941 unsigned int s_mount_opt;
942 unsigned int s_mount_flags;
943 ext4_fsblk_t s_sb_block;
946 unsigned short s_mount_state;
947 unsigned short s_pad;
948 int s_addr_per_block_bits;
949 int s_desc_per_block_bits;
952 unsigned int s_inode_readahead_blks;
953 unsigned int s_inode_goal;
954 spinlock_t s_next_gen_lock;
955 u32 s_next_generation;
957 int s_def_hash_version;
958 int s_hash_unsigned; /* 3 if hash should be signed, 0 if not */
959 struct percpu_counter s_freeblocks_counter;
960 struct percpu_counter s_freeinodes_counter;
961 struct percpu_counter s_dirs_counter;
962 struct percpu_counter s_dirtyblocks_counter;
963 struct blockgroup_lock *s_blockgroup_lock;
964 struct proc_dir_entry *s_proc;
965 struct kobject s_kobj;
966 struct completion s_kobj_unregister;
969 struct inode *s_journal_inode;
970 struct journal_s *s_journal;
971 struct list_head s_orphan;
972 struct mutex s_orphan_lock;
973 struct mutex s_resize_lock;
974 unsigned long s_commit_interval;
975 u32 s_max_batch_time;
976 u32 s_min_batch_time;
977 struct block_device *journal_bdev;
978 #ifdef CONFIG_JBD2_DEBUG
979 struct timer_list turn_ro_timer; /* For turning read-only (crash simulation) */
980 wait_queue_head_t ro_wait_queue; /* For people waiting for the fs to go read-only */
983 char *s_qf_names[MAXQUOTAS]; /* Names of quota files with journalled quota */
984 int s_jquota_fmt; /* Format of quota to use */
986 unsigned int s_want_extra_isize; /* New inodes should reserve # bytes */
987 struct rb_root system_blks;
990 /* ext4 extents stats */
991 unsigned long s_ext_min;
992 unsigned long s_ext_max;
993 unsigned long s_depth_max;
994 spinlock_t s_ext_stats_lock;
995 unsigned long s_ext_blocks;
996 unsigned long s_ext_extents;
999 /* for buddy allocator */
1000 struct ext4_group_info ***s_group_info;
1001 struct inode *s_buddy_cache;
1002 long s_blocks_reserved;
1003 spinlock_t s_reserve_lock;
1004 spinlock_t s_md_lock;
1005 tid_t s_last_transaction;
1006 unsigned short *s_mb_offsets;
1007 unsigned int *s_mb_maxs;
1010 unsigned long s_stripe;
1011 unsigned int s_mb_stream_request;
1012 unsigned int s_mb_max_to_scan;
1013 unsigned int s_mb_min_to_scan;
1014 unsigned int s_mb_stats;
1015 unsigned int s_mb_order2_reqs;
1016 unsigned int s_mb_group_prealloc;
1017 unsigned int s_max_writeback_mb_bump;
1018 /* where last allocation was done - for stream allocation */
1019 unsigned long s_mb_last_group;
1020 unsigned long s_mb_last_start;
1022 /* stats for buddy allocator */
1023 spinlock_t s_mb_pa_lock;
1024 atomic_t s_bal_reqs; /* number of reqs with len > 1 */
1025 atomic_t s_bal_success; /* we found long enough chunks */
1026 atomic_t s_bal_allocated; /* in blocks */
1027 atomic_t s_bal_ex_scanned; /* total extents scanned */
1028 atomic_t s_bal_goals; /* goal hits */
1029 atomic_t s_bal_breaks; /* too long searches */
1030 atomic_t s_bal_2orders; /* 2^order hits */
1031 spinlock_t s_bal_lock;
1032 unsigned long s_mb_buddies_generated;
1033 unsigned long long s_mb_generation_time;
1034 atomic_t s_mb_lost_chunks;
1035 atomic_t s_mb_preallocated;
1036 atomic_t s_mb_discarded;
1037 atomic_t s_lock_busy;
1039 /* locality groups */
1040 struct ext4_locality_group __percpu *s_locality_groups;
1042 /* for write statistics */
1043 unsigned long s_sectors_written_start;
1044 u64 s_kbytes_written;
1046 unsigned int s_log_groups_per_flex;
1047 struct flex_groups *s_flex_groups;
1049 /* workqueue for dio unwritten */
1050 struct workqueue_struct *dio_unwritten_wq;
1053 static inline struct ext4_sb_info *EXT4_SB(struct super_block *sb)
1055 return sb->s_fs_info;
1057 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
1059 return container_of(inode, struct ext4_inode_info, vfs_inode);
1062 static inline struct timespec ext4_current_time(struct inode *inode)
1064 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
1065 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
1068 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
1070 return ino == EXT4_ROOT_INO ||
1071 ino == EXT4_JOURNAL_INO ||
1072 ino == EXT4_RESIZE_INO ||
1073 (ino >= EXT4_FIRST_INO(sb) &&
1074 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
1078 * Inode dynamic state flags
1081 EXT4_STATE_JDATA, /* journaled data exists */
1082 EXT4_STATE_NEW, /* inode is newly created */
1083 EXT4_STATE_XATTR, /* has in-inode xattrs */
1084 EXT4_STATE_NO_EXPAND, /* No space for expansion */
1085 EXT4_STATE_DA_ALLOC_CLOSE, /* Alloc DA blks on close */
1086 EXT4_STATE_EXT_MIGRATE, /* Inode is migrating */
1087 EXT4_STATE_DIO_UNWRITTEN, /* need convert on dio done*/
1090 static inline int ext4_test_inode_state(struct inode *inode, int bit)
1092 return test_bit(bit, &EXT4_I(inode)->i_state_flags);
1095 static inline void ext4_set_inode_state(struct inode *inode, int bit)
1097 set_bit(bit, &EXT4_I(inode)->i_state_flags);
1100 static inline void ext4_clear_inode_state(struct inode *inode, int bit)
1102 clear_bit(bit, &EXT4_I(inode)->i_state_flags);
1105 /* Assume that user mode programs are passing in an ext4fs superblock, not
1106 * a kernel struct super_block. This will allow us to call the feature-test
1107 * macros from user land. */
1108 #define EXT4_SB(sb) (sb)
1111 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
1114 * Codes for operating systems
1116 #define EXT4_OS_LINUX 0
1117 #define EXT4_OS_HURD 1
1118 #define EXT4_OS_MASIX 2
1119 #define EXT4_OS_FREEBSD 3
1120 #define EXT4_OS_LITES 4
1125 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
1126 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
1128 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
1129 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
1131 #define EXT4_GOOD_OLD_INODE_SIZE 128
1134 * Feature set definitions
1137 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
1138 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
1139 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
1140 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
1141 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
1142 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
1143 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
1144 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
1145 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
1146 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
1147 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
1148 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
1149 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
1150 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
1151 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
1152 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
1153 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
1154 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
1156 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
1157 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
1158 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
1159 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
1160 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
1161 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
1163 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
1164 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
1165 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
1166 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
1167 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
1168 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
1169 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
1171 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
1172 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
1173 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
1174 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
1175 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
1176 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
1177 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
1178 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
1179 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
1180 #define EXT4_FEATURE_INCOMPAT_EA_INODE 0x0400 /* EA in inode */
1181 #define EXT4_FEATURE_INCOMPAT_DIRDATA 0x1000 /* data in dirent */
1183 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
1184 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
1185 EXT4_FEATURE_INCOMPAT_RECOVER| \
1186 EXT4_FEATURE_INCOMPAT_META_BG| \
1187 EXT4_FEATURE_INCOMPAT_EXTENTS| \
1188 EXT4_FEATURE_INCOMPAT_64BIT| \
1189 EXT4_FEATURE_INCOMPAT_FLEX_BG)
1190 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
1191 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
1192 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
1193 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
1194 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
1195 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
1196 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
1199 * Default values for user and/or group using reserved blocks
1201 #define EXT4_DEF_RESUID 0
1202 #define EXT4_DEF_RESGID 0
1204 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
1207 * Default mount options
1209 #define EXT4_DEFM_DEBUG 0x0001
1210 #define EXT4_DEFM_BSDGROUPS 0x0002
1211 #define EXT4_DEFM_XATTR_USER 0x0004
1212 #define EXT4_DEFM_ACL 0x0008
1213 #define EXT4_DEFM_UID16 0x0010
1214 #define EXT4_DEFM_JMODE 0x0060
1215 #define EXT4_DEFM_JMODE_DATA 0x0020
1216 #define EXT4_DEFM_JMODE_ORDERED 0x0040
1217 #define EXT4_DEFM_JMODE_WBACK 0x0060
1220 * Default journal batch times
1222 #define EXT4_DEF_MIN_BATCH_TIME 0
1223 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
1226 * Minimum number of groups in a flexgroup before we separate out
1227 * directories into the first block group of a flexgroup
1229 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
1232 * Structure of a directory entry
1234 #define EXT4_NAME_LEN 255
1236 struct ext4_dir_entry {
1237 __le32 inode; /* Inode number */
1238 __le16 rec_len; /* Directory entry length */
1239 __le16 name_len; /* Name length */
1240 char name[EXT4_NAME_LEN]; /* File name */
1244 * The new version of the directory entry. Since EXT4 structures are
1245 * stored in intel byte order, and the name_len field could never be
1246 * bigger than 255 chars, it's safe to reclaim the extra byte for the
1249 struct ext4_dir_entry_2 {
1250 __le32 inode; /* Inode number */
1251 __le16 rec_len; /* Directory entry length */
1252 __u8 name_len; /* Name length */
1254 char name[EXT4_NAME_LEN]; /* File name */
1258 * Ext4 directory file types. Only the low 3 bits are used. The
1259 * other bits are reserved for now.
1261 #define EXT4_FT_UNKNOWN 0
1262 #define EXT4_FT_REG_FILE 1
1263 #define EXT4_FT_DIR 2
1264 #define EXT4_FT_CHRDEV 3
1265 #define EXT4_FT_BLKDEV 4
1266 #define EXT4_FT_FIFO 5
1267 #define EXT4_FT_SOCK 6
1268 #define EXT4_FT_SYMLINK 7
1270 #define EXT4_FT_MAX 8
1273 * EXT4_DIR_PAD defines the directory entries boundaries
1275 * NOTE: It must be a multiple of 4
1277 #define EXT4_DIR_PAD 4
1278 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
1279 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
1281 #define EXT4_MAX_REC_LEN ((1<<16)-1)
1284 * Hash Tree Directory indexing
1285 * (c) Daniel Phillips, 2001
1288 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
1289 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
1290 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
1291 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
1292 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
1294 /* Legal values for the dx_root hash_version field: */
1296 #define DX_HASH_LEGACY 0
1297 #define DX_HASH_HALF_MD4 1
1298 #define DX_HASH_TEA 2
1299 #define DX_HASH_LEGACY_UNSIGNED 3
1300 #define DX_HASH_HALF_MD4_UNSIGNED 4
1301 #define DX_HASH_TEA_UNSIGNED 5
1305 /* hash info structure used by the directory hash */
1314 #define EXT4_HTREE_EOF 0x7fffffff
1317 * Control parameters used by ext4_htree_next_block
1319 #define HASH_NB_ALWAYS 1
1323 * Describe an inode's exact location on disk and in memory
1327 struct buffer_head *bh;
1328 unsigned long offset;
1329 ext4_group_t block_group;
1332 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
1334 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
1338 * This structure is stuffed into the struct file's private_data field
1339 * for directories. It is where we put information so that we can do
1340 * readdir operations in hash tree order.
1342 struct dir_private_info {
1343 struct rb_root root;
1344 struct rb_node *curr_node;
1345 struct fname *extra_fname;
1348 __u32 curr_minor_hash;
1352 /* calculate the first block number of the group */
1353 static inline ext4_fsblk_t
1354 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
1356 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
1357 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
1361 * Special error return code only used by dx_probe() and its callers.
1363 #define ERR_BAD_DX_DIR -75000
1365 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
1366 ext4_group_t *blockgrpp, ext4_grpblk_t *offsetp);
1368 extern struct proc_dir_entry *ext4_proc_root;
1371 * Function prototypes
1375 * Ok, these declarations are also in <linux/kernel.h> but none of the
1376 * ext4 source programs needs to include it so they are duplicated here.
1378 # define NORET_TYPE /**/
1379 # define ATTRIB_NORET __attribute__((noreturn))
1380 # define NORET_AND noreturn,
1383 extern unsigned int ext4_count_free(struct buffer_head *, unsigned);
1386 extern unsigned int ext4_block_group(struct super_block *sb,
1387 ext4_fsblk_t blocknr);
1388 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
1389 ext4_fsblk_t blocknr);
1390 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
1391 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
1392 ext4_group_t group);
1393 extern ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
1394 ext4_fsblk_t goal, unsigned long *count, int *errp);
1395 extern int ext4_claim_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1396 extern int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks);
1397 extern void ext4_add_groupblocks(handle_t *handle, struct super_block *sb,
1398 ext4_fsblk_t block, unsigned long count);
1399 extern ext4_fsblk_t ext4_count_free_blocks(struct super_block *);
1400 extern void ext4_check_blocks_bitmap(struct super_block *);
1401 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
1402 ext4_group_t block_group,
1403 struct buffer_head ** bh);
1404 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
1405 struct buffer_head *ext4_read_block_bitmap(struct super_block *sb,
1406 ext4_group_t block_group);
1407 extern unsigned ext4_init_block_bitmap(struct super_block *sb,
1408 struct buffer_head *bh,
1410 struct ext4_group_desc *desc);
1411 #define ext4_free_blocks_after_init(sb, group, desc) \
1412 ext4_init_block_bitmap(sb, NULL, group, desc)
1415 extern int ext4_check_dir_entry(const char *, struct inode *,
1416 struct ext4_dir_entry_2 *,
1417 struct buffer_head *, unsigned int);
1418 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
1420 struct ext4_dir_entry_2 *dirent);
1421 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
1424 extern int ext4_sync_file(struct file *, struct dentry *, int);
1427 extern int ext4fs_dirhash(const char *name, int len, struct
1428 dx_hash_info *hinfo);
1431 extern struct inode *ext4_new_inode(handle_t *, struct inode *, int,
1432 const struct qstr *qstr, __u32 goal);
1433 extern void ext4_free_inode(handle_t *, struct inode *);
1434 extern struct inode * ext4_orphan_get(struct super_block *, unsigned long);
1435 extern unsigned long ext4_count_free_inodes(struct super_block *);
1436 extern unsigned long ext4_count_dirs(struct super_block *);
1437 extern void ext4_check_inodes_bitmap(struct super_block *);
1438 extern unsigned ext4_init_inode_bitmap(struct super_block *sb,
1439 struct buffer_head *bh,
1441 struct ext4_group_desc *desc);
1442 extern void mark_bitmap_end(int start_bit, int end_bit, char *bitmap);
1445 extern long ext4_mb_stats;
1446 extern long ext4_mb_max_to_scan;
1447 extern int ext4_mb_init(struct super_block *, int);
1448 extern int ext4_mb_release(struct super_block *);
1449 extern ext4_fsblk_t ext4_mb_new_blocks(handle_t *,
1450 struct ext4_allocation_request *, int *);
1451 extern int ext4_mb_reserve_blocks(struct super_block *, int);
1452 extern void ext4_discard_preallocations(struct inode *);
1453 extern int __init init_ext4_mballoc(void);
1454 extern void exit_ext4_mballoc(void);
1455 extern void ext4_free_blocks(handle_t *handle, struct inode *inode,
1456 struct buffer_head *bh, ext4_fsblk_t block,
1457 unsigned long count, int flags);
1458 extern int ext4_mb_add_groupinfo(struct super_block *sb,
1459 ext4_group_t i, struct ext4_group_desc *desc);
1460 extern int ext4_mb_get_buddy_cache_lock(struct super_block *, ext4_group_t);
1461 extern void ext4_mb_put_buddy_cache_lock(struct super_block *,
1464 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
1465 ext4_lblk_t, int, int *);
1466 struct buffer_head *ext4_bread(handle_t *, struct inode *,
1467 ext4_lblk_t, int, int *);
1468 int ext4_get_block(struct inode *inode, sector_t iblock,
1469 struct buffer_head *bh_result, int create);
1471 extern struct inode *ext4_iget(struct super_block *, unsigned long);
1472 extern int ext4_write_inode(struct inode *, struct writeback_control *);
1473 extern int ext4_setattr(struct dentry *, struct iattr *);
1474 extern int ext4_getattr(struct vfsmount *mnt, struct dentry *dentry,
1475 struct kstat *stat);
1476 extern void ext4_delete_inode(struct inode *);
1477 extern int ext4_sync_inode(handle_t *, struct inode *);
1478 extern void ext4_dirty_inode(struct inode *);
1479 extern int ext4_change_inode_journal_flag(struct inode *, int);
1480 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
1481 extern int ext4_can_truncate(struct inode *inode);
1482 extern void ext4_truncate(struct inode *);
1483 extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks);
1484 extern void ext4_set_inode_flags(struct inode *);
1485 extern void ext4_get_inode_flags(struct ext4_inode_info *);
1486 extern int ext4_alloc_da_blocks(struct inode *inode);
1487 extern void ext4_set_aops(struct inode *inode);
1488 extern int ext4_writepage_trans_blocks(struct inode *);
1489 extern int ext4_meta_trans_blocks(struct inode *, int nrblocks, int idxblocks);
1490 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
1491 extern int ext4_block_truncate_page(handle_t *handle,
1492 struct address_space *mapping, loff_t from);
1493 extern int ext4_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf);
1494 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
1495 extern int flush_completed_IO(struct inode *inode);
1496 extern void ext4_da_update_reserve_space(struct inode *inode,
1497 int used, int quota_claim);
1499 extern long ext4_ioctl(struct file *, unsigned int, unsigned long);
1500 extern long ext4_compat_ioctl(struct file *, unsigned int, unsigned long);
1503 extern int ext4_ext_migrate(struct inode *);
1506 extern unsigned int ext4_rec_len_from_disk(__le16 dlen, unsigned blocksize);
1507 extern __le16 ext4_rec_len_to_disk(unsigned len, unsigned blocksize);
1508 extern int ext4_orphan_add(handle_t *, struct inode *);
1509 extern int ext4_orphan_del(handle_t *, struct inode *);
1510 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
1511 __u32 start_minor_hash, __u32 *next_hash);
1514 extern int ext4_group_add(struct super_block *sb,
1515 struct ext4_new_group_data *input);
1516 extern int ext4_group_extend(struct super_block *sb,
1517 struct ext4_super_block *es,
1518 ext4_fsblk_t n_blocks_count);
1521 extern void __ext4_error(struct super_block *, const char *, const char *, ...)
1522 __attribute__ ((format (printf, 3, 4)));
1523 #define ext4_error(sb, message...) __ext4_error(sb, __func__, ## message)
1524 extern void ext4_error_inode(const char *, struct inode *, const char *, ...)
1525 __attribute__ ((format (printf, 3, 4)));
1526 extern void ext4_error_file(const char *, struct file *, const char *, ...)
1527 __attribute__ ((format (printf, 3, 4)));
1528 extern void __ext4_std_error(struct super_block *, const char *, int);
1529 extern void ext4_abort(struct super_block *, const char *, const char *, ...)
1530 __attribute__ ((format (printf, 3, 4)));
1531 extern void __ext4_warning(struct super_block *, const char *,
1533 __attribute__ ((format (printf, 3, 4)));
1534 #define ext4_warning(sb, message...) __ext4_warning(sb, __func__, ## message)
1535 extern void ext4_msg(struct super_block *, const char *, const char *, ...)
1536 __attribute__ ((format (printf, 3, 4)));
1537 extern void ext4_grp_locked_error(struct super_block *, ext4_group_t,
1538 const char *, const char *, ...)
1539 __attribute__ ((format (printf, 4, 5)));
1540 extern void ext4_update_dynamic_rev(struct super_block *sb);
1541 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1543 extern int ext4_update_rocompat_feature(handle_t *handle,
1544 struct super_block *sb, __u32 rocompat);
1545 extern int ext4_update_incompat_feature(handle_t *handle,
1546 struct super_block *sb, __u32 incompat);
1547 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1548 struct ext4_group_desc *bg);
1549 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1550 struct ext4_group_desc *bg);
1551 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1552 struct ext4_group_desc *bg);
1553 extern __u32 ext4_free_blks_count(struct super_block *sb,
1554 struct ext4_group_desc *bg);
1555 extern __u32 ext4_free_inodes_count(struct super_block *sb,
1556 struct ext4_group_desc *bg);
1557 extern __u32 ext4_used_dirs_count(struct super_block *sb,
1558 struct ext4_group_desc *bg);
1559 extern __u32 ext4_itable_unused_count(struct super_block *sb,
1560 struct ext4_group_desc *bg);
1561 extern void ext4_block_bitmap_set(struct super_block *sb,
1562 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1563 extern void ext4_inode_bitmap_set(struct super_block *sb,
1564 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1565 extern void ext4_inode_table_set(struct super_block *sb,
1566 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1567 extern void ext4_free_blks_set(struct super_block *sb,
1568 struct ext4_group_desc *bg, __u32 count);
1569 extern void ext4_free_inodes_set(struct super_block *sb,
1570 struct ext4_group_desc *bg, __u32 count);
1571 extern void ext4_used_dirs_set(struct super_block *sb,
1572 struct ext4_group_desc *bg, __u32 count);
1573 extern void ext4_itable_unused_set(struct super_block *sb,
1574 struct ext4_group_desc *bg, __u32 count);
1575 extern __le16 ext4_group_desc_csum(struct ext4_sb_info *sbi, __u32 group,
1576 struct ext4_group_desc *gdp);
1577 extern int ext4_group_desc_csum_verify(struct ext4_sb_info *sbi, __u32 group,
1578 struct ext4_group_desc *gdp);
1580 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1582 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1583 le32_to_cpu(es->s_blocks_count_lo);
1586 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1588 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1589 le32_to_cpu(es->s_r_blocks_count_lo);
1592 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1594 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1595 le32_to_cpu(es->s_free_blocks_count_lo);
1598 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1601 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1602 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1605 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1608 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1609 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1612 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1615 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1616 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1619 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1621 if (S_ISREG(le16_to_cpu(raw_inode->i_mode)))
1622 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1623 le32_to_cpu(raw_inode->i_size_lo);
1625 return (loff_t) le32_to_cpu(raw_inode->i_size_lo);
1628 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1630 raw_inode->i_size_lo = cpu_to_le32(i_size);
1631 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1635 struct ext4_group_info *ext4_get_group_info(struct super_block *sb,
1638 struct ext4_group_info ***grp_info;
1639 long indexv, indexh;
1640 grp_info = EXT4_SB(sb)->s_group_info;
1641 indexv = group >> (EXT4_DESC_PER_BLOCK_BITS(sb));
1642 indexh = group & ((EXT4_DESC_PER_BLOCK(sb)) - 1);
1643 return grp_info[indexv][indexh];
1647 * Reading s_groups_count requires using smp_rmb() afterwards. See
1648 * the locking protocol documented in the comments of ext4_group_add()
1651 static inline ext4_group_t ext4_get_groups_count(struct super_block *sb)
1653 ext4_group_t ngroups = EXT4_SB(sb)->s_groups_count;
1659 static inline ext4_group_t ext4_flex_group(struct ext4_sb_info *sbi,
1660 ext4_group_t block_group)
1662 return block_group >> sbi->s_log_groups_per_flex;
1665 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info *sbi)
1667 return 1 << sbi->s_log_groups_per_flex;
1670 #define ext4_std_error(sb, errno) \
1673 __ext4_std_error((sb), __func__, (errno)); \
1677 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1678 * counters. So we need to make sure we have free blocks more
1679 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1681 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1683 #define EXT4_FREEBLOCKS_WATERMARK 0
1686 static inline void ext4_update_i_disksize(struct inode *inode, loff_t newsize)
1689 * XXX: replace with spinlock if seen contended -bzzz
1691 down_write(&EXT4_I(inode)->i_data_sem);
1692 if (newsize > EXT4_I(inode)->i_disksize)
1693 EXT4_I(inode)->i_disksize = newsize;
1694 up_write(&EXT4_I(inode)->i_data_sem);
1698 struct ext4_group_info {
1699 unsigned long bb_state;
1700 struct rb_root bb_free_root;
1701 ext4_grpblk_t bb_first_free; /* first free block */
1702 ext4_grpblk_t bb_free; /* total free blocks */
1703 ext4_grpblk_t bb_fragments; /* nr of freespace fragments */
1704 ext4_grpblk_t bb_largest_free_order;/* order of largest frag in BG */
1705 struct list_head bb_prealloc_list;
1709 struct rw_semaphore alloc_sem;
1710 ext4_grpblk_t bb_counters[]; /* Nr of free power-of-two-block
1711 * regions, index is order.
1712 * bb_counters[3] = 5 means
1713 * 5 free 8-block regions. */
1716 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1718 #define EXT4_MB_GRP_NEED_INIT(grp) \
1719 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1721 #define EXT4_MAX_CONTENTION 8
1722 #define EXT4_CONTENTION_THRESHOLD 2
1724 static inline spinlock_t *ext4_group_lock_ptr(struct super_block *sb,
1727 return bgl_lock_ptr(EXT4_SB(sb)->s_blockgroup_lock, group);
1731 * Returns true if the filesystem is busy enough that attempts to
1732 * access the block group locks has run into contention.
1734 static inline int ext4_fs_is_busy(struct ext4_sb_info *sbi)
1736 return (atomic_read(&sbi->s_lock_busy) > EXT4_CONTENTION_THRESHOLD);
1739 static inline void ext4_lock_group(struct super_block *sb, ext4_group_t group)
1741 spinlock_t *lock = ext4_group_lock_ptr(sb, group);
1742 if (spin_trylock(lock))
1744 * We're able to grab the lock right away, so drop the
1745 * lock contention counter.
1747 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, -1, 0);
1750 * The lock is busy, so bump the contention counter,
1751 * and then wait on the spin lock.
1753 atomic_add_unless(&EXT4_SB(sb)->s_lock_busy, 1,
1754 EXT4_MAX_CONTENTION);
1759 static inline void ext4_unlock_group(struct super_block *sb,
1762 spin_unlock(ext4_group_lock_ptr(sb, group));
1766 * Inodes and files operations
1770 extern const struct file_operations ext4_dir_operations;
1773 extern const struct inode_operations ext4_file_inode_operations;
1774 extern const struct file_operations ext4_file_operations;
1777 extern const struct inode_operations ext4_dir_inode_operations;
1778 extern const struct inode_operations ext4_special_inode_operations;
1779 extern struct dentry *ext4_get_parent(struct dentry *child);
1782 extern const struct inode_operations ext4_symlink_inode_operations;
1783 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1785 /* block_validity */
1786 extern void ext4_release_system_zone(struct super_block *sb);
1787 extern int ext4_setup_system_zone(struct super_block *sb);
1788 extern int __init init_ext4_system_zone(void);
1789 extern void exit_ext4_system_zone(void);
1790 extern int ext4_data_block_valid(struct ext4_sb_info *sbi,
1791 ext4_fsblk_t start_blk,
1792 unsigned int count);
1795 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1796 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1797 extern int ext4_ext_index_trans_blocks(struct inode *inode, int nrblocks,
1799 extern int ext4_ext_map_blocks(handle_t *handle, struct inode *inode,
1800 struct ext4_map_blocks *map, int flags);
1801 extern void ext4_ext_truncate(struct inode *);
1802 extern void ext4_ext_init(struct super_block *);
1803 extern void ext4_ext_release(struct super_block *);
1804 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1806 extern int ext4_convert_unwritten_extents(struct inode *inode, loff_t offset,
1808 extern int ext4_map_blocks(handle_t *handle, struct inode *inode,
1809 struct ext4_map_blocks *map, int flags);
1810 extern int ext4_get_blocks(handle_t *handle, struct inode *inode,
1811 sector_t block, unsigned int max_blocks,
1812 struct buffer_head *bh, int flags);
1813 extern int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
1814 __u64 start, __u64 len);
1816 extern int ext4_move_extents(struct file *o_filp, struct file *d_filp,
1817 __u64 start_orig, __u64 start_donor,
1818 __u64 len, __u64 *moved_len);
1821 /* BH_Uninit flag: blocks are allocated but uninitialized on disk */
1822 enum ext4_state_bits {
1823 BH_Uninit /* blocks are allocated but uninitialized on disk */
1824 = BH_JBDPrivateStart,
1827 BUFFER_FNS(Uninit, uninit)
1828 TAS_BUFFER_FNS(Uninit, uninit)
1831 * Add new method to test wether block and inode bitmaps are properly
1832 * initialized. With uninit_bg reading the block from disk is not enough
1833 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1835 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1837 static inline int bitmap_uptodate(struct buffer_head *bh)
1839 return (buffer_uptodate(bh) &&
1840 test_bit(BH_BITMAP_UPTODATE, &(bh)->b_state));
1842 static inline void set_bitmap_uptodate(struct buffer_head *bh)
1844 set_bit(BH_BITMAP_UPTODATE, &(bh)->b_state);
1847 #define in_range(b, first, len) ((b) >= (first) && (b) <= (first) + (len) - 1)
1849 #endif /* __KERNEL__ */
1851 #endif /* _EXT4_H */