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>
26 * The fourth extended filesystem constants/structures
30 * Define EXT4FS_DEBUG to produce debug messages
35 * Define EXT4_RESERVATION to reserve data blocks for expanding files
37 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
38 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
39 #define EXT4_MAX_RESERVE_BLOCKS 1027
40 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
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_MULTIBLOCK_ALLOCATOR 1
58 /* prefer goal again. length */
59 #define EXT4_MB_HINT_MERGE 1
60 /* blocks already reserved */
61 #define EXT4_MB_HINT_RESERVED 2
62 /* metadata is being allocated */
63 #define EXT4_MB_HINT_METADATA 4
64 /* first blocks in the file */
65 #define EXT4_MB_HINT_FIRST 8
66 /* search for the best chunk */
67 #define EXT4_MB_HINT_BEST 16
68 /* data is being allocated */
69 #define EXT4_MB_HINT_DATA 32
70 /* don't preallocate (for tails) */
71 #define EXT4_MB_HINT_NOPREALLOC 64
72 /* allocate for locality group */
73 #define EXT4_MB_HINT_GROUP_ALLOC 128
74 /* allocate goal blocks or none */
75 #define EXT4_MB_HINT_GOAL_ONLY 256
76 /* goal is meaningful */
77 #define EXT4_MB_HINT_TRY_GOAL 512
78 /* blocks already pre-reserved by delayed allocation */
79 #define EXT4_MB_DELALLOC_RESERVED 1024
82 struct ext4_allocation_request
{
83 /* target inode for block we're allocating */
85 /* logical block in target inode */
87 /* phys. target (a hint) */
89 /* the closest logical allocated block to the left */
91 /* phys. block for ^^^ */
93 /* the closest logical allocated block to the right */
95 /* phys. block for ^^^ */
97 /* how many blocks we want to allocate */
99 /* flags. see above EXT4_MB_HINT_* */
104 * Special inodes numbers
106 #define EXT4_BAD_INO 1 /* Bad blocks inode */
107 #define EXT4_ROOT_INO 2 /* Root inode */
108 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
109 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
110 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
111 #define EXT4_JOURNAL_INO 8 /* Journal inode */
113 /* First non-reserved inode for old ext4 filesystems */
114 #define EXT4_GOOD_OLD_FIRST_INO 11
117 * Maximal count of links to a file
119 #define EXT4_LINK_MAX 65000
122 * Macro-instructions used to manage several block sizes
124 #define EXT4_MIN_BLOCK_SIZE 1024
125 #define EXT4_MAX_BLOCK_SIZE 65536
126 #define EXT4_MIN_BLOCK_LOG_SIZE 10
128 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
130 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
132 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
134 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
136 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
139 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
140 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
141 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
143 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
144 EXT4_GOOD_OLD_INODE_SIZE : \
146 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
147 EXT4_GOOD_OLD_FIRST_INO : \
150 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
153 * Structure of a blocks group descriptor
155 struct ext4_group_desc
157 __le32 bg_block_bitmap_lo
; /* Blocks bitmap block */
158 __le32 bg_inode_bitmap_lo
; /* Inodes bitmap block */
159 __le32 bg_inode_table_lo
; /* Inodes table block */
160 __le16 bg_free_blocks_count_lo
;/* Free blocks count */
161 __le16 bg_free_inodes_count_lo
;/* Free inodes count */
162 __le16 bg_used_dirs_count_lo
; /* Directories count */
163 __le16 bg_flags
; /* EXT4_BG_flags (INODE_UNINIT, etc) */
164 __u32 bg_reserved
[2]; /* Likely block/inode bitmap checksum */
165 __le16 bg_itable_unused_lo
; /* Unused inodes count */
166 __le16 bg_checksum
; /* crc16(sb_uuid+group+desc) */
167 __le32 bg_block_bitmap_hi
; /* Blocks bitmap block MSB */
168 __le32 bg_inode_bitmap_hi
; /* Inodes bitmap block MSB */
169 __le32 bg_inode_table_hi
; /* Inodes table block MSB */
170 __le16 bg_free_blocks_count_hi
;/* Free blocks count MSB */
171 __le16 bg_free_inodes_count_hi
;/* Free inodes count MSB */
172 __le16 bg_used_dirs_count_hi
; /* Directories count MSB */
173 __le16 bg_itable_unused_hi
; /* Unused inodes count MSB */
174 __u32 bg_reserved2
[3];
178 * Structure of a flex block group info
186 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
187 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
188 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
194 * Macro-instructions used to manage group descriptors
196 #define EXT4_MIN_DESC_SIZE 32
197 #define EXT4_MIN_DESC_SIZE_64BIT 64
198 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
199 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
201 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
202 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
203 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
204 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
206 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
207 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
208 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
212 * Constants relative to the data blocks
214 #define EXT4_NDIR_BLOCKS 12
215 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
216 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
217 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
218 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
223 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
224 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
225 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
226 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
227 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
228 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
229 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
230 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
231 /* Reserved for compression usage... */
232 #define EXT4_DIRTY_FL 0x00000100
233 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
234 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
235 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
236 /* End compression flags --- maybe not all used */
237 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
238 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
239 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
240 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
241 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
242 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
243 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
244 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
245 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
246 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
248 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
249 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
252 * Inode dynamic state flags
254 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
255 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
256 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
257 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
258 #define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
260 /* Used to pass group descriptor data when online resize is done */
261 struct ext4_new_group_input
{
262 __u32 group
; /* Group number for this data */
263 __u64 block_bitmap
; /* Absolute block number of block bitmap */
264 __u64 inode_bitmap
; /* Absolute block number of inode bitmap */
265 __u64 inode_table
; /* Absolute block number of inode table start */
266 __u32 blocks_count
; /* Total number of blocks in this group */
267 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
271 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
272 struct ext4_new_group_data
{
278 __u16 reserved_blocks
;
280 __u32 free_blocks_count
;
284 * Following is used by preallocation code to tell get_blocks() that we
285 * want uninitialzed extents.
287 #define EXT4_CREATE_UNINITIALIZED_EXT 2
292 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
293 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
294 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
295 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
296 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
297 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
298 #ifdef CONFIG_JBD2_DEBUG
299 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
301 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
302 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
303 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
304 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
305 #define EXT4_IOC_MIGRATE _IO('f', 9)
306 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
309 * ioctl commands in 32 bit emulation
311 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
312 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
313 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
314 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
315 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
316 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
317 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
318 #ifdef CONFIG_JBD2_DEBUG
319 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
321 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
322 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
328 struct ext4_mount_options
{
329 unsigned long s_mount_opt
;
332 unsigned long s_commit_interval
;
333 u32 s_min_batch_time
, s_max_batch_time
;
336 char *s_qf_names
[MAXQUOTAS
];
341 * Structure of an inode on the disk
344 __le16 i_mode
; /* File mode */
345 __le16 i_uid
; /* Low 16 bits of Owner Uid */
346 __le32 i_size_lo
; /* Size in bytes */
347 __le32 i_atime
; /* Access time */
348 __le32 i_ctime
; /* Inode Change time */
349 __le32 i_mtime
; /* Modification time */
350 __le32 i_dtime
; /* Deletion Time */
351 __le16 i_gid
; /* Low 16 bits of Group Id */
352 __le16 i_links_count
; /* Links count */
353 __le32 i_blocks_lo
; /* Blocks count */
354 __le32 i_flags
; /* File flags */
360 __u32 h_i_translator
;
365 } osd1
; /* OS dependent 1 */
366 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
367 __le32 i_generation
; /* File version (for NFS) */
368 __le32 i_file_acl_lo
; /* File ACL */
370 __le32 i_obso_faddr
; /* Obsoleted fragment address */
373 __le16 l_i_blocks_high
; /* were l_i_reserved1 */
374 __le16 l_i_file_acl_high
;
375 __le16 l_i_uid_high
; /* these 2 fields */
376 __le16 l_i_gid_high
; /* were reserved2[0] */
380 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
387 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
388 __le16 m_i_file_acl_high
;
389 __u32 m_i_reserved2
[2];
391 } osd2
; /* OS dependent 2 */
392 __le16 i_extra_isize
;
394 __le32 i_ctime_extra
; /* extra Change time (nsec << 2 | epoch) */
395 __le32 i_mtime_extra
; /* extra Modification time(nsec << 2 | epoch) */
396 __le32 i_atime_extra
; /* extra Access time (nsec << 2 | epoch) */
397 __le32 i_crtime
; /* File Creation time */
398 __le32 i_crtime_extra
; /* extra FileCreationtime (nsec << 2 | epoch) */
399 __le32 i_version_hi
; /* high 32 bits for 64-bit version */
403 #define EXT4_EPOCH_BITS 2
404 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
405 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
408 * Extended fields will fit into an inode if the filesystem was formatted
409 * with large inodes (-I 256 or larger) and there are not currently any EAs
410 * consuming all of the available space. For new inodes we always reserve
411 * enough space for the kernel's known extended fields, but for inodes
412 * created with an old kernel this might not have been the case. None of
413 * the extended inode fields is critical for correct filesystem operation.
414 * This macro checks if a certain field fits in the inode. Note that
415 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
417 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
418 ((offsetof(typeof(*ext4_inode), field) + \
419 sizeof((ext4_inode)->field)) \
420 <= (EXT4_GOOD_OLD_INODE_SIZE + \
421 (einode)->i_extra_isize)) \
423 static inline __le32 ext4_encode_extra_time(struct timespec *time)
425 return cpu_to_le32((sizeof(time
->tv_sec
) > 4 ?
426 time
->tv_sec
>> 32 : 0) |
427 ((time
->tv_nsec
<< 2) & EXT4_NSEC_MASK
));
430 static inline void ext4_decode_extra_time(struct timespec
*time
, __le32 extra
)
432 if (sizeof(time
->tv_sec
) > 4)
433 time
->tv_sec
|= (__u64
)(le32_to_cpu(extra
) & EXT4_EPOCH_MASK
)
435 time
->tv_nsec
= (le32_to_cpu(extra
) & EXT4_NSEC_MASK
) >> 2;
438 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
440 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
441 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
442 (raw_inode)->xtime ## _extra = \
443 ext4_encode_extra_time(&(inode)->xtime); \
446 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
448 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
449 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
450 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
451 (raw_inode)->xtime ## _extra = \
452 ext4_encode_extra_time(&(einode)->xtime); \
455 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
457 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
458 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
459 ext4_decode_extra_time(&(inode)->xtime, \
460 raw_inode->xtime ## _extra); \
463 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
465 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
466 (einode)->xtime.tv_sec = \
467 (signed)le32_to_cpu((raw_inode)->xtime); \
468 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
469 ext4_decode_extra_time(&(einode)->xtime, \
470 raw_inode->xtime ## _extra); \
473 #define i_disk_version osd1.linux1.l_i_version
475 #if defined(__KERNEL__) || defined(__linux__)
476 #define i_reserved1 osd1.linux1.l_i_reserved1
477 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
478 #define i_blocks_high osd2.linux2.l_i_blocks_high
479 #define i_uid_low i_uid
480 #define i_gid_low i_gid
481 #define i_uid_high osd2.linux2.l_i_uid_high
482 #define i_gid_high osd2.linux2.l_i_gid_high
483 #define i_reserved2 osd2.linux2.l_i_reserved2
485 #elif defined(__GNU__)
487 #define i_translator osd1.hurd1.h_i_translator
488 #define i_uid_high osd2.hurd2.h_i_uid_high
489 #define i_gid_high osd2.hurd2.h_i_gid_high
490 #define i_author osd2.hurd2.h_i_author
492 #elif defined(__masix__)
494 #define i_reserved1 osd1.masix1.m_i_reserved1
495 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
496 #define i_reserved2 osd2.masix2.m_i_reserved2
498 #endif /* defined(__KERNEL__) || defined(__linux__) */
503 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
504 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
505 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
508 * Misc. filesystem flags
510 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
511 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
512 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
517 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
518 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
519 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
520 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
521 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
522 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
523 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
524 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
525 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
526 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
527 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
528 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
529 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
530 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
531 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
532 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
533 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
534 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
535 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
536 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
537 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
538 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
539 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
540 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
541 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
542 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
543 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
544 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
546 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
547 #ifndef _LINUX_EXT2_FS_H
548 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
549 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
550 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
553 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
554 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
555 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
558 #define ext4_set_bit ext2_set_bit
559 #define ext4_set_bit_atomic ext2_set_bit_atomic
560 #define ext4_clear_bit ext2_clear_bit
561 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
562 #define ext4_test_bit ext2_test_bit
563 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
564 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
565 #define ext4_find_next_bit ext2_find_next_bit
568 * Maximal mount counts between two filesystem checks
570 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
571 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
574 * Behaviour when detecting errors
576 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
577 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
578 #define EXT4_ERRORS_PANIC 3 /* Panic */
579 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
582 * Structure of the super block
584 struct ext4_super_block
{
585 /*00*/ __le32 s_inodes_count
; /* Inodes count */
586 __le32 s_blocks_count_lo
; /* Blocks count */
587 __le32 s_r_blocks_count_lo
; /* Reserved blocks count */
588 __le32 s_free_blocks_count_lo
; /* Free blocks count */
589 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
590 __le32 s_first_data_block
; /* First Data Block */
591 __le32 s_log_block_size
; /* Block size */
592 __le32 s_obso_log_frag_size
; /* Obsoleted fragment size */
593 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
594 __le32 s_obso_frags_per_group
; /* Obsoleted fragments per group */
595 __le32 s_inodes_per_group
; /* # Inodes per group */
596 __le32 s_mtime
; /* Mount time */
597 /*30*/ __le32 s_wtime
; /* Write time */
598 __le16 s_mnt_count
; /* Mount count */
599 __le16 s_max_mnt_count
; /* Maximal mount count */
600 __le16 s_magic
; /* Magic signature */
601 __le16 s_state
; /* File system state */
602 __le16 s_errors
; /* Behaviour when detecting errors */
603 __le16 s_minor_rev_level
; /* minor revision level */
604 /*40*/ __le32 s_lastcheck
; /* time of last check */
605 __le32 s_checkinterval
; /* max. time between checks */
606 __le32 s_creator_os
; /* OS */
607 __le32 s_rev_level
; /* Revision level */
608 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
609 __le16 s_def_resgid
; /* Default gid for reserved blocks */
611 * These fields are for EXT4_DYNAMIC_REV superblocks only.
613 * Note: the difference between the compatible feature set and
614 * the incompatible feature set is that if there is a bit set
615 * in the incompatible feature set that the kernel doesn't
616 * know about, it should refuse to mount the filesystem.
618 * e2fsck's requirements are more strict; if it doesn't know
619 * about a feature in either the compatible or incompatible
620 * feature set, it must abort and not try to meddle with
621 * things it doesn't understand...
623 __le32 s_first_ino
; /* First non-reserved inode */
624 __le16 s_inode_size
; /* size of inode structure */
625 __le16 s_block_group_nr
; /* block group # of this superblock */
626 __le32 s_feature_compat
; /* compatible feature set */
627 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
628 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
629 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
630 /*78*/ char s_volume_name
[16]; /* volume name */
631 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
632 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
634 * Performance hints. Directory preallocation should only
635 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
637 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
638 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
639 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
641 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
643 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
644 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
645 __le32 s_journal_dev
; /* device number of journal file */
646 __le32 s_last_orphan
; /* start of list of inodes to delete */
647 __le32 s_hash_seed
[4]; /* HTREE hash seed */
648 __u8 s_def_hash_version
; /* Default hash version to use */
649 __u8 s_reserved_char_pad
;
650 __le16 s_desc_size
; /* size of group descriptor */
651 /*100*/ __le32 s_default_mount_opts
;
652 __le32 s_first_meta_bg
; /* First metablock block group */
653 __le32 s_mkfs_time
; /* When the filesystem was created */
654 __le32 s_jnl_blocks
[17]; /* Backup of the journal inode */
655 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
656 /*150*/ __le32 s_blocks_count_hi
; /* Blocks count */
657 __le32 s_r_blocks_count_hi
; /* Reserved blocks count */
658 __le32 s_free_blocks_count_hi
; /* Free blocks count */
659 __le16 s_min_extra_isize
; /* All inodes have at least # bytes */
660 __le16 s_want_extra_isize
; /* New inodes should reserve # bytes */
661 __le32 s_flags
; /* Miscellaneous flags */
662 __le16 s_raid_stride
; /* RAID stride */
663 __le16 s_mmp_interval
; /* # seconds to wait in MMP checking */
664 __le64 s_mmp_block
; /* Block for multi-mount protection */
665 __le32 s_raid_stripe_width
; /* blocks on all data disks (N*stride)*/
666 __u8 s_log_groups_per_flex
; /* FLEX_BG group size */
667 __u8 s_reserved_char_pad2
;
668 __le16 s_reserved_pad
;
669 __u32 s_reserved
[162]; /* Padding to the end of the block */
673 static inline struct ext4_sb_info
*EXT4_SB(struct super_block
*sb
)
675 return sb
->s_fs_info
;
677 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
679 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
682 static inline struct timespec
ext4_current_time(struct inode
*inode
)
684 return (inode
->i_sb
->s_time_gran
< NSEC_PER_SEC
) ?
685 current_fs_time(inode
->i_sb
) : CURRENT_TIME_SEC
;
689 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
691 return ino
== EXT4_ROOT_INO
||
692 ino
== EXT4_JOURNAL_INO
||
693 ino
== EXT4_RESIZE_INO
||
694 (ino
>= EXT4_FIRST_INO(sb
) &&
695 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
698 /* Assume that user mode programs are passing in an ext4fs superblock, not
699 * a kernel struct super_block. This will allow us to call the feature-test
700 * macros from user land. */
701 #define EXT4_SB(sb) (sb)
704 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
707 * Codes for operating systems
709 #define EXT4_OS_LINUX 0
710 #define EXT4_OS_HURD 1
711 #define EXT4_OS_MASIX 2
712 #define EXT4_OS_FREEBSD 3
713 #define EXT4_OS_LITES 4
718 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
719 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
721 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
722 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
724 #define EXT4_GOOD_OLD_INODE_SIZE 128
727 * Feature set definitions
730 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
731 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
732 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
733 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
734 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
735 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
736 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
737 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
738 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
739 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
740 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
741 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
742 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
743 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
744 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
745 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
746 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
747 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
749 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
750 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
751 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
752 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
753 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
754 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
756 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
757 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
758 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
759 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
760 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
761 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
762 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
764 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
765 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
766 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
767 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
768 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
769 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
770 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
771 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
772 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
774 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
775 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
776 EXT4_FEATURE_INCOMPAT_RECOVER| \
777 EXT4_FEATURE_INCOMPAT_META_BG| \
778 EXT4_FEATURE_INCOMPAT_EXTENTS| \
779 EXT4_FEATURE_INCOMPAT_64BIT| \
780 EXT4_FEATURE_INCOMPAT_FLEX_BG)
781 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
782 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
783 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
784 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
785 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
786 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
787 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
790 * Default values for user and/or group using reserved blocks
792 #define EXT4_DEF_RESUID 0
793 #define EXT4_DEF_RESGID 0
795 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
798 * Default mount options
800 #define EXT4_DEFM_DEBUG 0x0001
801 #define EXT4_DEFM_BSDGROUPS 0x0002
802 #define EXT4_DEFM_XATTR_USER 0x0004
803 #define EXT4_DEFM_ACL 0x0008
804 #define EXT4_DEFM_UID16 0x0010
805 #define EXT4_DEFM_JMODE 0x0060
806 #define EXT4_DEFM_JMODE_DATA 0x0020
807 #define EXT4_DEFM_JMODE_ORDERED 0x0040
808 #define EXT4_DEFM_JMODE_WBACK 0x0060
811 * Default journal batch times
813 #define EXT4_DEF_MIN_BATCH_TIME 0
814 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
817 * Structure of a directory entry
819 #define EXT4_NAME_LEN 255
821 struct ext4_dir_entry
{
822 __le32 inode
; /* Inode number */
823 __le16 rec_len
; /* Directory entry length */
824 __le16 name_len
; /* Name length */
825 char name
[EXT4_NAME_LEN
]; /* File name */
829 * The new version of the directory entry. Since EXT4 structures are
830 * stored in intel byte order, and the name_len field could never be
831 * bigger than 255 chars, it's safe to reclaim the extra byte for the
834 struct ext4_dir_entry_2
{
835 __le32 inode
; /* Inode number */
836 __le16 rec_len
; /* Directory entry length */
837 __u8 name_len
; /* Name length */
839 char name
[EXT4_NAME_LEN
]; /* File name */
843 * Ext4 directory file types. Only the low 3 bits are used. The
844 * other bits are reserved for now.
846 #define EXT4_FT_UNKNOWN 0
847 #define EXT4_FT_REG_FILE 1
848 #define EXT4_FT_DIR 2
849 #define EXT4_FT_CHRDEV 3
850 #define EXT4_FT_BLKDEV 4
851 #define EXT4_FT_FIFO 5
852 #define EXT4_FT_SOCK 6
853 #define EXT4_FT_SYMLINK 7
855 #define EXT4_FT_MAX 8
858 * EXT4_DIR_PAD defines the directory entries boundaries
860 * NOTE: It must be a multiple of 4
862 #define EXT4_DIR_PAD 4
863 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
864 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
866 #define EXT4_MAX_REC_LEN ((1<<16)-1)
868 static inline unsigned ext4_rec_len_from_disk(__le16 dlen
)
870 unsigned len
= le16_to_cpu(dlen
);
872 if (len
== EXT4_MAX_REC_LEN
|| len
== 0)
877 static inline __le16
ext4_rec_len_to_disk(unsigned len
)
879 if (len
== (1 << 16))
880 return cpu_to_le16(EXT4_MAX_REC_LEN
);
881 else if (len
> (1 << 16))
883 return cpu_to_le16(len
);
887 * Hash Tree Directory indexing
888 * (c) Daniel Phillips, 2001
891 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
892 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
893 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
894 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
895 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
897 /* Legal values for the dx_root hash_version field: */
899 #define DX_HASH_LEGACY 0
900 #define DX_HASH_HALF_MD4 1
901 #define DX_HASH_TEA 2
902 #define DX_HASH_LEGACY_UNSIGNED 3
903 #define DX_HASH_HALF_MD4_UNSIGNED 4
904 #define DX_HASH_TEA_UNSIGNED 5
908 /* hash info structure used by the directory hash */
917 #define EXT4_HTREE_EOF 0x7fffffff
920 * Control parameters used by ext4_htree_next_block
922 #define HASH_NB_ALWAYS 1
926 * Describe an inode's exact location on disk and in memory
930 struct buffer_head
*bh
;
931 unsigned long offset
;
932 ext4_group_t block_group
;
935 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
937 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
941 * This structure is stuffed into the struct file's private_data field
942 * for directories. It is where we put information so that we can do
943 * readdir operations in hash tree order.
945 struct dir_private_info
{
947 struct rb_node
*curr_node
;
948 struct fname
*extra_fname
;
951 __u32 curr_minor_hash
;
955 /* calculate the first block number of the group */
956 static inline ext4_fsblk_t
957 ext4_group_first_block_no(struct super_block
*sb
, ext4_group_t group_no
)
959 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
960 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
964 * Special error return code only used by dx_probe() and its callers.
966 #define ERR_BAD_DX_DIR -75000
968 void ext4_get_group_no_and_offset(struct super_block
*sb
, ext4_fsblk_t blocknr
,
969 ext4_group_t
*blockgrpp
, ext4_grpblk_t
*offsetp
);
971 extern struct proc_dir_entry
*ext4_proc_root
;
973 #ifdef CONFIG_PROC_FS
974 extern const struct file_operations ext4_ui_proc_fops
;
976 #define EXT4_PROC_HANDLER(name, var) \
978 proc = proc_create_data(name, mode, sbi->s_proc, \
979 &ext4_ui_proc_fops, &sbi->s_##var); \
980 if (proc == NULL) { \
981 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
986 #define EXT4_PROC_HANDLER(name, var)
990 * Function prototypes
994 * Ok, these declarations are also in <linux/kernel.h> but none of the
995 * ext4 source programs needs to include it so they are duplicated here.
997 # define NORET_TYPE /**/
998 # define ATTRIB_NORET __attribute__((noreturn))
999 # define NORET_AND noreturn,
1002 extern unsigned int ext4_count_free(struct buffer_head
*, unsigned);
1005 extern unsigned int ext4_block_group(struct super_block
*sb
,
1006 ext4_fsblk_t blocknr
);
1007 extern ext4_grpblk_t
ext4_block_group_offset(struct super_block
*sb
,
1008 ext4_fsblk_t blocknr
);
1009 extern int ext4_bg_has_super(struct super_block
*sb
, ext4_group_t group
);
1010 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
,
1011 ext4_group_t group
);
1012 extern ext4_fsblk_t
ext4_new_meta_blocks(handle_t
*handle
, struct inode
*inode
,
1013 ext4_fsblk_t goal
, unsigned long *count
, int *errp
);
1014 extern int ext4_claim_free_blocks(struct ext4_sb_info
*sbi
, s64 nblocks
);
1015 extern int ext4_has_free_blocks(struct ext4_sb_info
*sbi
, s64 nblocks
);
1016 extern void ext4_free_blocks(handle_t
*handle
, struct inode
*inode
,
1017 ext4_fsblk_t block
, unsigned long count
, int metadata
);
1018 extern void ext4_add_groupblocks(handle_t
*handle
, struct super_block
*sb
,
1019 ext4_fsblk_t block
, unsigned long count
);
1020 extern ext4_fsblk_t
ext4_count_free_blocks(struct super_block
*);
1021 extern void ext4_check_blocks_bitmap(struct super_block
*);
1022 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
1023 ext4_group_t block_group
,
1024 struct buffer_head
** bh
);
1025 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
1028 extern int ext4_check_dir_entry(const char *, struct inode
*,
1029 struct ext4_dir_entry_2
*,
1030 struct buffer_head
*, unsigned int);
1031 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
1033 struct ext4_dir_entry_2
*dirent
);
1034 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
1037 extern int ext4_sync_file(struct file
*, struct dentry
*, int);
1040 extern int ext4fs_dirhash(const char *name
, int len
, struct
1041 dx_hash_info
*hinfo
);
1044 extern struct inode
* ext4_new_inode(handle_t
*, struct inode
*, int);
1045 extern void ext4_free_inode(handle_t
*, struct inode
*);
1046 extern struct inode
* ext4_orphan_get(struct super_block
*, unsigned long);
1047 extern unsigned long ext4_count_free_inodes(struct super_block
*);
1048 extern unsigned long ext4_count_dirs(struct super_block
*);
1049 extern void ext4_check_inodes_bitmap(struct super_block
*);
1052 extern long ext4_mb_stats
;
1053 extern long ext4_mb_max_to_scan
;
1054 extern int ext4_mb_init(struct super_block
*, int);
1055 extern int ext4_mb_release(struct super_block
*);
1056 extern ext4_fsblk_t
ext4_mb_new_blocks(handle_t
*,
1057 struct ext4_allocation_request
*, int *);
1058 extern int ext4_mb_reserve_blocks(struct super_block
*, int);
1059 extern void ext4_discard_preallocations(struct inode
*);
1060 extern int __init
init_ext4_mballoc(void);
1061 extern void exit_ext4_mballoc(void);
1062 extern void ext4_mb_free_blocks(handle_t
*, struct inode
*,
1063 unsigned long, unsigned long, int, unsigned long *);
1064 extern int ext4_mb_add_groupinfo(struct super_block
*sb
,
1065 ext4_group_t i
, struct ext4_group_desc
*desc
);
1066 extern void ext4_mb_update_group_info(struct ext4_group_info
*grp
,
1068 extern int ext4_mb_get_buddy_cache_lock(struct super_block
*, ext4_group_t
);
1069 extern void ext4_mb_put_buddy_cache_lock(struct super_block
*,
1072 int ext4_forget(handle_t
*handle
, int is_metadata
, struct inode
*inode
,
1073 struct buffer_head
*bh
, ext4_fsblk_t blocknr
);
1074 struct buffer_head
*ext4_getblk(handle_t
*, struct inode
*,
1075 ext4_lblk_t
, int, int *);
1076 struct buffer_head
*ext4_bread(handle_t
*, struct inode
*,
1077 ext4_lblk_t
, int, int *);
1078 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
1079 struct buffer_head
*bh_result
, int create
);
1081 extern struct inode
*ext4_iget(struct super_block
*, unsigned long);
1082 extern int ext4_write_inode(struct inode
*, int);
1083 extern int ext4_setattr(struct dentry
*, struct iattr
*);
1084 extern int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
1085 struct kstat
*stat
);
1086 extern void ext4_delete_inode(struct inode
*);
1087 extern int ext4_sync_inode(handle_t
*, struct inode
*);
1088 extern void ext4_dirty_inode(struct inode
*);
1089 extern int ext4_change_inode_journal_flag(struct inode
*, int);
1090 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
1091 extern int ext4_can_truncate(struct inode
*inode
);
1092 extern void ext4_truncate(struct inode
*);
1093 extern void ext4_set_inode_flags(struct inode
*);
1094 extern void ext4_get_inode_flags(struct ext4_inode_info
*);
1095 extern void ext4_set_aops(struct inode
*inode
);
1096 extern int ext4_writepage_trans_blocks(struct inode
*);
1097 extern int ext4_meta_trans_blocks(struct inode
*, int nrblocks
, int idxblocks
);
1098 extern int ext4_chunk_trans_blocks(struct inode
*, int nrblocks
);
1099 extern int ext4_block_truncate_page(handle_t
*handle
,
1100 struct address_space
*mapping
, loff_t from
);
1101 extern int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1104 extern long ext4_ioctl(struct file
*, unsigned int, unsigned long);
1105 extern long ext4_compat_ioctl(struct file
*, unsigned int, unsigned long);
1108 extern int ext4_ext_migrate(struct inode
*);
1110 extern int ext4_orphan_add(handle_t
*, struct inode
*);
1111 extern int ext4_orphan_del(handle_t
*, struct inode
*);
1112 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
1113 __u32 start_minor_hash
, __u32
*next_hash
);
1116 extern int ext4_group_add(struct super_block
*sb
,
1117 struct ext4_new_group_data
*input
);
1118 extern int ext4_group_extend(struct super_block
*sb
,
1119 struct ext4_super_block
*es
,
1120 ext4_fsblk_t n_blocks_count
);
1123 extern void ext4_error(struct super_block
*, const char *, const char *, ...)
1124 __attribute__ ((format (printf
, 3, 4)));
1125 extern void __ext4_std_error(struct super_block
*, const char *, int);
1126 extern void ext4_abort(struct super_block
*, const char *, const char *, ...)
1127 __attribute__ ((format (printf
, 3, 4)));
1128 extern void ext4_warning(struct super_block
*, const char *, const char *, ...)
1129 __attribute__ ((format (printf
, 3, 4)));
1130 extern void ext4_grp_locked_error(struct super_block
*, ext4_group_t
,
1131 const char *, const char *, ...)
1132 __attribute__ ((format (printf
, 4, 5)));
1133 extern void ext4_update_dynamic_rev(struct super_block
*sb
);
1134 extern int ext4_update_compat_feature(handle_t
*handle
, struct super_block
*sb
,
1136 extern int ext4_update_rocompat_feature(handle_t
*handle
,
1137 struct super_block
*sb
, __u32 rocompat
);
1138 extern int ext4_update_incompat_feature(handle_t
*handle
,
1139 struct super_block
*sb
, __u32 incompat
);
1140 extern ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
1141 struct ext4_group_desc
*bg
);
1142 extern ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
1143 struct ext4_group_desc
*bg
);
1144 extern ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
1145 struct ext4_group_desc
*bg
);
1146 extern __u32
ext4_free_blks_count(struct super_block
*sb
,
1147 struct ext4_group_desc
*bg
);
1148 extern __u32
ext4_free_inodes_count(struct super_block
*sb
,
1149 struct ext4_group_desc
*bg
);
1150 extern __u32
ext4_used_dirs_count(struct super_block
*sb
,
1151 struct ext4_group_desc
*bg
);
1152 extern __u32
ext4_itable_unused_count(struct super_block
*sb
,
1153 struct ext4_group_desc
*bg
);
1154 extern void ext4_block_bitmap_set(struct super_block
*sb
,
1155 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1156 extern void ext4_inode_bitmap_set(struct super_block
*sb
,
1157 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1158 extern void ext4_inode_table_set(struct super_block
*sb
,
1159 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1160 extern void ext4_free_blks_set(struct super_block
*sb
,
1161 struct ext4_group_desc
*bg
, __u32 count
);
1162 extern void ext4_free_inodes_set(struct super_block
*sb
,
1163 struct ext4_group_desc
*bg
, __u32 count
);
1164 extern void ext4_used_dirs_set(struct super_block
*sb
,
1165 struct ext4_group_desc
*bg
, __u32 count
);
1166 extern void ext4_itable_unused_set(struct super_block
*sb
,
1167 struct ext4_group_desc
*bg
, __u32 count
);
1169 static inline ext4_fsblk_t
ext4_blocks_count(struct ext4_super_block
*es
)
1171 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_blocks_count_hi
) << 32) |
1172 le32_to_cpu(es
->s_blocks_count_lo
);
1175 static inline ext4_fsblk_t
ext4_r_blocks_count(struct ext4_super_block
*es
)
1177 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_r_blocks_count_hi
) << 32) |
1178 le32_to_cpu(es
->s_r_blocks_count_lo
);
1181 static inline ext4_fsblk_t
ext4_free_blocks_count(struct ext4_super_block
*es
)
1183 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_free_blocks_count_hi
) << 32) |
1184 le32_to_cpu(es
->s_free_blocks_count_lo
);
1187 static inline void ext4_blocks_count_set(struct ext4_super_block
*es
,
1190 es
->s_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1191 es
->s_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1194 static inline void ext4_free_blocks_count_set(struct ext4_super_block
*es
,
1197 es
->s_free_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1198 es
->s_free_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1201 static inline void ext4_r_blocks_count_set(struct ext4_super_block
*es
,
1204 es
->s_r_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1205 es
->s_r_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1208 static inline loff_t
ext4_isize(struct ext4_inode
*raw_inode
)
1210 if (S_ISREG(le16_to_cpu(raw_inode
->i_mode
)))
1211 return ((loff_t
)le32_to_cpu(raw_inode
->i_size_high
) << 32) |
1212 le32_to_cpu(raw_inode
->i_size_lo
);
1214 return (loff_t
) le32_to_cpu(raw_inode
->i_size_lo
);
1217 static inline void ext4_isize_set(struct ext4_inode
*raw_inode
, loff_t i_size
)
1219 raw_inode
->i_size_lo
= cpu_to_le32(i_size
);
1220 raw_inode
->i_size_high
= cpu_to_le32(i_size
>> 32);
1224 struct ext4_group_info
*ext4_get_group_info(struct super_block
*sb
,
1227 struct ext4_group_info
***grp_info
;
1228 long indexv
, indexh
;
1229 grp_info
= EXT4_SB(sb
)->s_group_info
;
1230 indexv
= group
>> (EXT4_DESC_PER_BLOCK_BITS(sb
));
1231 indexh
= group
& ((EXT4_DESC_PER_BLOCK(sb
)) - 1);
1232 return grp_info
[indexv
][indexh
];
1236 static inline ext4_group_t
ext4_flex_group(struct ext4_sb_info
*sbi
,
1237 ext4_group_t block_group
)
1239 return block_group
>> sbi
->s_log_groups_per_flex
;
1242 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info
*sbi
)
1244 return 1 << sbi
->s_log_groups_per_flex
;
1247 #define ext4_std_error(sb, errno) \
1250 __ext4_std_error((sb), __func__, (errno)); \
1254 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1255 * counters. So we need to make sure we have free blocks more
1256 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1258 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1260 #define EXT4_FREEBLOCKS_WATERMARK 0
1263 static inline void ext4_update_i_disksize(struct inode
*inode
, loff_t newsize
)
1266 * XXX: replace with spinlock if seen contended -bzzz
1268 down_write(&EXT4_I(inode
)->i_data_sem
);
1269 if (newsize
> EXT4_I(inode
)->i_disksize
)
1270 EXT4_I(inode
)->i_disksize
= newsize
;
1271 up_write(&EXT4_I(inode
)->i_data_sem
);
1275 struct ext4_group_info
{
1276 unsigned long bb_state
;
1277 struct rb_root bb_free_root
;
1278 unsigned short bb_first_free
;
1279 unsigned short bb_free
;
1280 unsigned short bb_fragments
;
1281 struct list_head bb_prealloc_list
;
1285 struct rw_semaphore alloc_sem
;
1286 unsigned short bb_counters
[];
1289 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1290 #define EXT4_GROUP_INFO_LOCKED_BIT 1
1292 #define EXT4_MB_GRP_NEED_INIT(grp) \
1293 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1295 static inline void ext4_lock_group(struct super_block
*sb
, ext4_group_t group
)
1297 struct ext4_group_info
*grinfo
= ext4_get_group_info(sb
, group
);
1299 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT
, &(grinfo
->bb_state
));
1302 static inline void ext4_unlock_group(struct super_block
*sb
,
1305 struct ext4_group_info
*grinfo
= ext4_get_group_info(sb
, group
);
1307 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT
, &(grinfo
->bb_state
));
1310 static inline int ext4_is_group_locked(struct super_block
*sb
,
1313 struct ext4_group_info
*grinfo
= ext4_get_group_info(sb
, group
);
1315 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT
,
1316 &(grinfo
->bb_state
));
1320 * Inodes and files operations
1324 extern const struct file_operations ext4_dir_operations
;
1327 extern const struct inode_operations ext4_file_inode_operations
;
1328 extern const struct file_operations ext4_file_operations
;
1331 extern const struct inode_operations ext4_dir_inode_operations
;
1332 extern const struct inode_operations ext4_special_inode_operations
;
1335 extern const struct inode_operations ext4_symlink_inode_operations
;
1336 extern const struct inode_operations ext4_fast_symlink_inode_operations
;
1339 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
1340 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
1341 extern int ext4_ext_index_trans_blocks(struct inode
*inode
, int nrblocks
,
1343 extern int ext4_ext_get_blocks(handle_t
*handle
, struct inode
*inode
,
1344 ext4_lblk_t iblock
, unsigned int max_blocks
,
1345 struct buffer_head
*bh_result
,
1346 int create
, int extend_disksize
);
1347 extern void ext4_ext_truncate(struct inode
*);
1348 extern void ext4_ext_init(struct super_block
*);
1349 extern void ext4_ext_release(struct super_block
*);
1350 extern long ext4_fallocate(struct inode
*inode
, int mode
, loff_t offset
,
1352 extern int ext4_get_blocks_wrap(handle_t
*handle
, struct inode
*inode
,
1353 sector_t block
, unsigned int max_blocks
,
1354 struct buffer_head
*bh
, int create
,
1355 int extend_disksize
, int flag
);
1356 extern int ext4_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
1357 __u64 start
, __u64 len
);
1360 * Add new method to test wether block and inode bitmaps are properly
1361 * initialized. With uninit_bg reading the block from disk is not enough
1362 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1364 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1366 static inline int bitmap_uptodate(struct buffer_head
*bh
)
1368 return (buffer_uptodate(bh
) &&
1369 test_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
));
1371 static inline void set_bitmap_uptodate(struct buffer_head
*bh
)
1373 set_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
);
1376 #endif /* __KERNEL__ */
1378 #endif /* _EXT4_H */