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>
27 * The fourth extended filesystem constants/structures
31 * Define EXT4FS_DEBUG to produce debug messages
39 #define ext4_debug(f, a...) \
41 printk(KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
42 __FILE__, __LINE__, __func__); \
43 printk(KERN_DEBUG f, ## a); \
46 #define ext4_debug(f, a...) do {} while (0)
49 /* prefer goal again. length */
50 #define EXT4_MB_HINT_MERGE 1
51 /* blocks already reserved */
52 #define EXT4_MB_HINT_RESERVED 2
53 /* metadata is being allocated */
54 #define EXT4_MB_HINT_METADATA 4
55 /* first blocks in the file */
56 #define EXT4_MB_HINT_FIRST 8
57 /* search for the best chunk */
58 #define EXT4_MB_HINT_BEST 16
59 /* data is being allocated */
60 #define EXT4_MB_HINT_DATA 32
61 /* don't preallocate (for tails) */
62 #define EXT4_MB_HINT_NOPREALLOC 64
63 /* allocate for locality group */
64 #define EXT4_MB_HINT_GROUP_ALLOC 128
65 /* allocate goal blocks or none */
66 #define EXT4_MB_HINT_GOAL_ONLY 256
67 /* goal is meaningful */
68 #define EXT4_MB_HINT_TRY_GOAL 512
69 /* blocks already pre-reserved by delayed allocation */
70 #define EXT4_MB_DELALLOC_RESERVED 1024
73 struct ext4_allocation_request
{
74 /* target inode for block we're allocating */
76 /* logical block in target inode */
78 /* phys. target (a hint) */
80 /* the closest logical allocated block to the left */
82 /* phys. block for ^^^ */
84 /* the closest logical allocated block to the right */
86 /* phys. block for ^^^ */
88 /* how many blocks we want to allocate */
90 /* flags. see above EXT4_MB_HINT_* */
95 * Special inodes numbers
97 #define EXT4_BAD_INO 1 /* Bad blocks inode */
98 #define EXT4_ROOT_INO 2 /* Root inode */
99 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
100 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
101 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
102 #define EXT4_JOURNAL_INO 8 /* Journal inode */
104 /* First non-reserved inode for old ext4 filesystems */
105 #define EXT4_GOOD_OLD_FIRST_INO 11
108 * Maximal count of links to a file
110 #define EXT4_LINK_MAX 65000
113 * Macro-instructions used to manage several block sizes
115 #define EXT4_MIN_BLOCK_SIZE 1024
116 #define EXT4_MAX_BLOCK_SIZE 65536
117 #define EXT4_MIN_BLOCK_LOG_SIZE 10
119 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
121 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
123 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof(__u32))
125 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
127 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
130 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
131 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
132 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
134 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
135 EXT4_GOOD_OLD_INODE_SIZE : \
137 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
138 EXT4_GOOD_OLD_FIRST_INO : \
141 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
144 * Structure of a blocks group descriptor
146 struct ext4_group_desc
148 __le32 bg_block_bitmap_lo
; /* Blocks bitmap block */
149 __le32 bg_inode_bitmap_lo
; /* Inodes bitmap block */
150 __le32 bg_inode_table_lo
; /* Inodes table block */
151 __le16 bg_free_blocks_count_lo
;/* Free blocks count */
152 __le16 bg_free_inodes_count_lo
;/* Free inodes count */
153 __le16 bg_used_dirs_count_lo
; /* Directories count */
154 __le16 bg_flags
; /* EXT4_BG_flags (INODE_UNINIT, etc) */
155 __u32 bg_reserved
[2]; /* Likely block/inode bitmap checksum */
156 __le16 bg_itable_unused_lo
; /* Unused inodes count */
157 __le16 bg_checksum
; /* crc16(sb_uuid+group+desc) */
158 __le32 bg_block_bitmap_hi
; /* Blocks bitmap block MSB */
159 __le32 bg_inode_bitmap_hi
; /* Inodes bitmap block MSB */
160 __le32 bg_inode_table_hi
; /* Inodes table block MSB */
161 __le16 bg_free_blocks_count_hi
;/* Free blocks count MSB */
162 __le16 bg_free_inodes_count_hi
;/* Free inodes count MSB */
163 __le16 bg_used_dirs_count_hi
; /* Directories count MSB */
164 __le16 bg_itable_unused_hi
; /* Unused inodes count MSB */
165 __u32 bg_reserved2
[3];
169 * Structure of a flex block group info
177 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
178 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
179 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
185 * Macro-instructions used to manage group descriptors
187 #define EXT4_MIN_DESC_SIZE 32
188 #define EXT4_MIN_DESC_SIZE_64BIT 64
189 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
190 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
192 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
193 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
194 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
195 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
197 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
198 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
199 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
203 * Constants relative to the data blocks
205 #define EXT4_NDIR_BLOCKS 12
206 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
207 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
208 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
209 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
214 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
215 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
216 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
217 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
218 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
219 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
220 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
221 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
222 /* Reserved for compression usage... */
223 #define EXT4_DIRTY_FL 0x00000100
224 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
225 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
226 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
227 /* End compression flags --- maybe not all used */
228 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
229 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
230 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
231 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
232 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
233 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
234 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
235 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
236 #define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
237 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
239 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
240 #define EXT4_FL_USER_MODIFIABLE 0x000B80FF /* User modifiable flags */
242 /* Flags that should be inherited by new inodes from their parent. */
243 #define EXT4_FL_INHERITED (EXT4_SECRM_FL | EXT4_UNRM_FL | EXT4_COMPR_FL |\
244 EXT4_SYNC_FL | EXT4_IMMUTABLE_FL | EXT4_APPEND_FL |\
245 EXT4_NODUMP_FL | EXT4_NOATIME_FL |\
246 EXT4_NOCOMPR_FL | EXT4_JOURNAL_DATA_FL |\
247 EXT4_NOTAIL_FL | EXT4_DIRSYNC_FL)
249 /* Flags that are appropriate for regular files (all but dir-specific ones). */
250 #define EXT4_REG_FLMASK (~(EXT4_DIRSYNC_FL | EXT4_TOPDIR_FL))
252 /* Flags that are appropriate for non-directories/regular files. */
253 #define EXT4_OTHER_FLMASK (EXT4_NODUMP_FL | EXT4_NOATIME_FL)
255 /* Mask out flags that are inappropriate for the given type of inode. */
256 static inline __u32
ext4_mask_flags(umode_t mode
, __u32 flags
)
260 else if (S_ISREG(mode
))
261 return flags
& EXT4_REG_FLMASK
;
263 return flags
& EXT4_OTHER_FLMASK
;
267 * Inode dynamic state flags
269 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
270 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
271 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
272 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
274 /* Used to pass group descriptor data when online resize is done */
275 struct ext4_new_group_input
{
276 __u32 group
; /* Group number for this data */
277 __u64 block_bitmap
; /* Absolute block number of block bitmap */
278 __u64 inode_bitmap
; /* Absolute block number of inode bitmap */
279 __u64 inode_table
; /* Absolute block number of inode table start */
280 __u32 blocks_count
; /* Total number of blocks in this group */
281 __u16 reserved_blocks
; /* Number of reserved blocks in this group */
285 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
286 struct ext4_new_group_data
{
292 __u16 reserved_blocks
;
294 __u32 free_blocks_count
;
298 * Following is used by preallocation code to tell get_blocks() that we
299 * want uninitialzed extents.
301 #define EXT4_CREATE_UNINITIALIZED_EXT 2
306 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
307 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
308 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
309 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
310 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
311 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
312 #ifdef CONFIG_JBD2_DEBUG
313 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
315 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
316 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
317 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
318 #define EXT4_IOC_GROUP_ADD _IOW('f', 8, struct ext4_new_group_input)
319 #define EXT4_IOC_MIGRATE _IO('f', 9)
320 /* note ioctl 11 reserved for filesystem-independent FIEMAP ioctl */
323 * ioctl commands in 32 bit emulation
325 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
326 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
327 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
328 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
329 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
330 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
331 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
332 #ifdef CONFIG_JBD2_DEBUG
333 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
335 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
336 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
342 struct ext4_mount_options
{
343 unsigned long s_mount_opt
;
346 unsigned long s_commit_interval
;
347 u32 s_min_batch_time
, s_max_batch_time
;
350 char *s_qf_names
[MAXQUOTAS
];
355 * Structure of an inode on the disk
358 __le16 i_mode
; /* File mode */
359 __le16 i_uid
; /* Low 16 bits of Owner Uid */
360 __le32 i_size_lo
; /* Size in bytes */
361 __le32 i_atime
; /* Access time */
362 __le32 i_ctime
; /* Inode Change time */
363 __le32 i_mtime
; /* Modification time */
364 __le32 i_dtime
; /* Deletion Time */
365 __le16 i_gid
; /* Low 16 bits of Group Id */
366 __le16 i_links_count
; /* Links count */
367 __le32 i_blocks_lo
; /* Blocks count */
368 __le32 i_flags
; /* File flags */
374 __u32 h_i_translator
;
379 } osd1
; /* OS dependent 1 */
380 __le32 i_block
[EXT4_N_BLOCKS
];/* Pointers to blocks */
381 __le32 i_generation
; /* File version (for NFS) */
382 __le32 i_file_acl_lo
; /* File ACL */
384 __le32 i_obso_faddr
; /* Obsoleted fragment address */
387 __le16 l_i_blocks_high
; /* were l_i_reserved1 */
388 __le16 l_i_file_acl_high
;
389 __le16 l_i_uid_high
; /* these 2 fields */
390 __le16 l_i_gid_high
; /* were reserved2[0] */
394 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
401 __le16 h_i_reserved1
; /* Obsoleted fragment number/size which are removed in ext4 */
402 __le16 m_i_file_acl_high
;
403 __u32 m_i_reserved2
[2];
405 } osd2
; /* OS dependent 2 */
406 __le16 i_extra_isize
;
408 __le32 i_ctime_extra
; /* extra Change time (nsec << 2 | epoch) */
409 __le32 i_mtime_extra
; /* extra Modification time(nsec << 2 | epoch) */
410 __le32 i_atime_extra
; /* extra Access time (nsec << 2 | epoch) */
411 __le32 i_crtime
; /* File Creation time */
412 __le32 i_crtime_extra
; /* extra FileCreationtime (nsec << 2 | epoch) */
413 __le32 i_version_hi
; /* high 32 bits for 64-bit version */
417 #define EXT4_EPOCH_BITS 2
418 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
419 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
422 * Extended fields will fit into an inode if the filesystem was formatted
423 * with large inodes (-I 256 or larger) and there are not currently any EAs
424 * consuming all of the available space. For new inodes we always reserve
425 * enough space for the kernel's known extended fields, but for inodes
426 * created with an old kernel this might not have been the case. None of
427 * the extended inode fields is critical for correct filesystem operation.
428 * This macro checks if a certain field fits in the inode. Note that
429 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
431 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
432 ((offsetof(typeof(*ext4_inode), field) + \
433 sizeof((ext4_inode)->field)) \
434 <= (EXT4_GOOD_OLD_INODE_SIZE + \
435 (einode)->i_extra_isize)) \
437 static inline __le32 ext4_encode_extra_time(struct timespec *time)
439 return cpu_to_le32((sizeof(time
->tv_sec
) > 4 ?
440 time
->tv_sec
>> 32 : 0) |
441 ((time
->tv_nsec
<< 2) & EXT4_NSEC_MASK
));
444 static inline void ext4_decode_extra_time(struct timespec
*time
, __le32 extra
)
446 if (sizeof(time
->tv_sec
) > 4)
447 time
->tv_sec
|= (__u64
)(le32_to_cpu(extra
) & EXT4_EPOCH_MASK
)
449 time
->tv_nsec
= (le32_to_cpu(extra
) & EXT4_NSEC_MASK
) >> 2;
452 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
454 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
455 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
456 (raw_inode)->xtime ## _extra = \
457 ext4_encode_extra_time(&(inode)->xtime); \
460 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
462 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
463 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
464 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
465 (raw_inode)->xtime ## _extra = \
466 ext4_encode_extra_time(&(einode)->xtime); \
469 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
471 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
472 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
473 ext4_decode_extra_time(&(inode)->xtime, \
474 raw_inode->xtime ## _extra); \
477 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
479 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
480 (einode)->xtime.tv_sec = \
481 (signed)le32_to_cpu((raw_inode)->xtime); \
482 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
483 ext4_decode_extra_time(&(einode)->xtime, \
484 raw_inode->xtime ## _extra); \
487 #define i_disk_version osd1.linux1.l_i_version
489 #if defined(__KERNEL__) || defined(__linux__)
490 #define i_reserved1 osd1.linux1.l_i_reserved1
491 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
492 #define i_blocks_high osd2.linux2.l_i_blocks_high
493 #define i_uid_low i_uid
494 #define i_gid_low i_gid
495 #define i_uid_high osd2.linux2.l_i_uid_high
496 #define i_gid_high osd2.linux2.l_i_gid_high
497 #define i_reserved2 osd2.linux2.l_i_reserved2
499 #elif defined(__GNU__)
501 #define i_translator osd1.hurd1.h_i_translator
502 #define i_uid_high osd2.hurd2.h_i_uid_high
503 #define i_gid_high osd2.hurd2.h_i_gid_high
504 #define i_author osd2.hurd2.h_i_author
506 #elif defined(__masix__)
508 #define i_reserved1 osd1.masix1.m_i_reserved1
509 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
510 #define i_reserved2 osd2.masix2.m_i_reserved2
512 #endif /* defined(__KERNEL__) || defined(__linux__) */
517 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
518 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
519 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
522 * Misc. filesystem flags
524 #define EXT2_FLAGS_SIGNED_HASH 0x0001 /* Signed dirhash in use */
525 #define EXT2_FLAGS_UNSIGNED_HASH 0x0002 /* Unsigned dirhash in use */
526 #define EXT2_FLAGS_TEST_FILESYS 0x0004 /* to test development code */
531 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
532 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
533 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
534 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
535 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
536 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
537 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
538 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
539 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
540 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
541 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
542 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
543 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
544 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
545 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
546 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
547 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
548 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
549 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
550 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
551 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
552 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
553 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
554 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
555 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
556 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
557 #define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
558 #define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
560 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
561 #ifndef _LINUX_EXT2_FS_H
562 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
563 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
564 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
567 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
568 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
569 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
572 #define ext4_set_bit ext2_set_bit
573 #define ext4_set_bit_atomic ext2_set_bit_atomic
574 #define ext4_clear_bit ext2_clear_bit
575 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
576 #define ext4_test_bit ext2_test_bit
577 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
578 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
579 #define ext4_find_next_bit ext2_find_next_bit
582 * Maximal mount counts between two filesystem checks
584 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
585 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
588 * Behaviour when detecting errors
590 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
591 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
592 #define EXT4_ERRORS_PANIC 3 /* Panic */
593 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
596 * Structure of the super block
598 struct ext4_super_block
{
599 /*00*/ __le32 s_inodes_count
; /* Inodes count */
600 __le32 s_blocks_count_lo
; /* Blocks count */
601 __le32 s_r_blocks_count_lo
; /* Reserved blocks count */
602 __le32 s_free_blocks_count_lo
; /* Free blocks count */
603 /*10*/ __le32 s_free_inodes_count
; /* Free inodes count */
604 __le32 s_first_data_block
; /* First Data Block */
605 __le32 s_log_block_size
; /* Block size */
606 __le32 s_obso_log_frag_size
; /* Obsoleted fragment size */
607 /*20*/ __le32 s_blocks_per_group
; /* # Blocks per group */
608 __le32 s_obso_frags_per_group
; /* Obsoleted fragments per group */
609 __le32 s_inodes_per_group
; /* # Inodes per group */
610 __le32 s_mtime
; /* Mount time */
611 /*30*/ __le32 s_wtime
; /* Write time */
612 __le16 s_mnt_count
; /* Mount count */
613 __le16 s_max_mnt_count
; /* Maximal mount count */
614 __le16 s_magic
; /* Magic signature */
615 __le16 s_state
; /* File system state */
616 __le16 s_errors
; /* Behaviour when detecting errors */
617 __le16 s_minor_rev_level
; /* minor revision level */
618 /*40*/ __le32 s_lastcheck
; /* time of last check */
619 __le32 s_checkinterval
; /* max. time between checks */
620 __le32 s_creator_os
; /* OS */
621 __le32 s_rev_level
; /* Revision level */
622 /*50*/ __le16 s_def_resuid
; /* Default uid for reserved blocks */
623 __le16 s_def_resgid
; /* Default gid for reserved blocks */
625 * These fields are for EXT4_DYNAMIC_REV superblocks only.
627 * Note: the difference between the compatible feature set and
628 * the incompatible feature set is that if there is a bit set
629 * in the incompatible feature set that the kernel doesn't
630 * know about, it should refuse to mount the filesystem.
632 * e2fsck's requirements are more strict; if it doesn't know
633 * about a feature in either the compatible or incompatible
634 * feature set, it must abort and not try to meddle with
635 * things it doesn't understand...
637 __le32 s_first_ino
; /* First non-reserved inode */
638 __le16 s_inode_size
; /* size of inode structure */
639 __le16 s_block_group_nr
; /* block group # of this superblock */
640 __le32 s_feature_compat
; /* compatible feature set */
641 /*60*/ __le32 s_feature_incompat
; /* incompatible feature set */
642 __le32 s_feature_ro_compat
; /* readonly-compatible feature set */
643 /*68*/ __u8 s_uuid
[16]; /* 128-bit uuid for volume */
644 /*78*/ char s_volume_name
[16]; /* volume name */
645 /*88*/ char s_last_mounted
[64]; /* directory where last mounted */
646 /*C8*/ __le32 s_algorithm_usage_bitmap
; /* For compression */
648 * Performance hints. Directory preallocation should only
649 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
651 __u8 s_prealloc_blocks
; /* Nr of blocks to try to preallocate*/
652 __u8 s_prealloc_dir_blocks
; /* Nr to preallocate for dirs */
653 __le16 s_reserved_gdt_blocks
; /* Per group desc for online growth */
655 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
657 /*D0*/ __u8 s_journal_uuid
[16]; /* uuid of journal superblock */
658 /*E0*/ __le32 s_journal_inum
; /* inode number of journal file */
659 __le32 s_journal_dev
; /* device number of journal file */
660 __le32 s_last_orphan
; /* start of list of inodes to delete */
661 __le32 s_hash_seed
[4]; /* HTREE hash seed */
662 __u8 s_def_hash_version
; /* Default hash version to use */
663 __u8 s_reserved_char_pad
;
664 __le16 s_desc_size
; /* size of group descriptor */
665 /*100*/ __le32 s_default_mount_opts
;
666 __le32 s_first_meta_bg
; /* First metablock block group */
667 __le32 s_mkfs_time
; /* When the filesystem was created */
668 __le32 s_jnl_blocks
[17]; /* Backup of the journal inode */
669 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
670 /*150*/ __le32 s_blocks_count_hi
; /* Blocks count */
671 __le32 s_r_blocks_count_hi
; /* Reserved blocks count */
672 __le32 s_free_blocks_count_hi
; /* Free blocks count */
673 __le16 s_min_extra_isize
; /* All inodes have at least # bytes */
674 __le16 s_want_extra_isize
; /* New inodes should reserve # bytes */
675 __le32 s_flags
; /* Miscellaneous flags */
676 __le16 s_raid_stride
; /* RAID stride */
677 __le16 s_mmp_interval
; /* # seconds to wait in MMP checking */
678 __le64 s_mmp_block
; /* Block for multi-mount protection */
679 __le32 s_raid_stripe_width
; /* blocks on all data disks (N*stride)*/
680 __u8 s_log_groups_per_flex
; /* FLEX_BG group size */
681 __u8 s_reserved_char_pad2
;
682 __le16 s_reserved_pad
;
683 __u32 s_reserved
[162]; /* Padding to the end of the block */
687 static inline struct ext4_sb_info
*EXT4_SB(struct super_block
*sb
)
689 return sb
->s_fs_info
;
691 static inline struct ext4_inode_info
*EXT4_I(struct inode
*inode
)
693 return container_of(inode
, struct ext4_inode_info
, vfs_inode
);
696 static inline struct timespec
ext4_current_time(struct inode
*inode
)
698 return (inode
->i_sb
->s_time_gran
< NSEC_PER_SEC
) ?
699 current_fs_time(inode
->i_sb
) : CURRENT_TIME_SEC
;
703 static inline int ext4_valid_inum(struct super_block
*sb
, unsigned long ino
)
705 return ino
== EXT4_ROOT_INO
||
706 ino
== EXT4_JOURNAL_INO
||
707 ino
== EXT4_RESIZE_INO
||
708 (ino
>= EXT4_FIRST_INO(sb
) &&
709 ino
<= le32_to_cpu(EXT4_SB(sb
)->s_es
->s_inodes_count
));
712 /* Assume that user mode programs are passing in an ext4fs superblock, not
713 * a kernel struct super_block. This will allow us to call the feature-test
714 * macros from user land. */
715 #define EXT4_SB(sb) (sb)
718 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
721 * Codes for operating systems
723 #define EXT4_OS_LINUX 0
724 #define EXT4_OS_HURD 1
725 #define EXT4_OS_MASIX 2
726 #define EXT4_OS_FREEBSD 3
727 #define EXT4_OS_LITES 4
732 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
733 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
735 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
736 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
738 #define EXT4_GOOD_OLD_INODE_SIZE 128
741 * Feature set definitions
744 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
745 ((EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask)) != 0)
746 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
747 ((EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask)) != 0)
748 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
749 ((EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask)) != 0)
750 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
751 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
752 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
753 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
754 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
755 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
756 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
757 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
758 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
759 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
760 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
761 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
763 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
764 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
765 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
766 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
767 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
768 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
770 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
771 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
772 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
773 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
774 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
775 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
776 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
778 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
779 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
780 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
781 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
782 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
783 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
784 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
785 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
786 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
788 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
789 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
790 EXT4_FEATURE_INCOMPAT_RECOVER| \
791 EXT4_FEATURE_INCOMPAT_META_BG| \
792 EXT4_FEATURE_INCOMPAT_EXTENTS| \
793 EXT4_FEATURE_INCOMPAT_64BIT| \
794 EXT4_FEATURE_INCOMPAT_FLEX_BG)
795 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
796 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
797 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
798 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
799 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
800 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
801 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
804 * Default values for user and/or group using reserved blocks
806 #define EXT4_DEF_RESUID 0
807 #define EXT4_DEF_RESGID 0
809 #define EXT4_DEF_INODE_READAHEAD_BLKS 32
812 * Default mount options
814 #define EXT4_DEFM_DEBUG 0x0001
815 #define EXT4_DEFM_BSDGROUPS 0x0002
816 #define EXT4_DEFM_XATTR_USER 0x0004
817 #define EXT4_DEFM_ACL 0x0008
818 #define EXT4_DEFM_UID16 0x0010
819 #define EXT4_DEFM_JMODE 0x0060
820 #define EXT4_DEFM_JMODE_DATA 0x0020
821 #define EXT4_DEFM_JMODE_ORDERED 0x0040
822 #define EXT4_DEFM_JMODE_WBACK 0x0060
825 * Default journal batch times
827 #define EXT4_DEF_MIN_BATCH_TIME 0
828 #define EXT4_DEF_MAX_BATCH_TIME 15000 /* 15ms */
831 * Minimum number of groups in a flexgroup before we separate out
832 * directories into the first block group of a flexgroup
834 #define EXT4_FLEX_SIZE_DIR_ALLOC_SCHEME 4
837 * Structure of a directory entry
839 #define EXT4_NAME_LEN 255
841 struct ext4_dir_entry
{
842 __le32 inode
; /* Inode number */
843 __le16 rec_len
; /* Directory entry length */
844 __le16 name_len
; /* Name length */
845 char name
[EXT4_NAME_LEN
]; /* File name */
849 * The new version of the directory entry. Since EXT4 structures are
850 * stored in intel byte order, and the name_len field could never be
851 * bigger than 255 chars, it's safe to reclaim the extra byte for the
854 struct ext4_dir_entry_2
{
855 __le32 inode
; /* Inode number */
856 __le16 rec_len
; /* Directory entry length */
857 __u8 name_len
; /* Name length */
859 char name
[EXT4_NAME_LEN
]; /* File name */
863 * Ext4 directory file types. Only the low 3 bits are used. The
864 * other bits are reserved for now.
866 #define EXT4_FT_UNKNOWN 0
867 #define EXT4_FT_REG_FILE 1
868 #define EXT4_FT_DIR 2
869 #define EXT4_FT_CHRDEV 3
870 #define EXT4_FT_BLKDEV 4
871 #define EXT4_FT_FIFO 5
872 #define EXT4_FT_SOCK 6
873 #define EXT4_FT_SYMLINK 7
875 #define EXT4_FT_MAX 8
878 * EXT4_DIR_PAD defines the directory entries boundaries
880 * NOTE: It must be a multiple of 4
882 #define EXT4_DIR_PAD 4
883 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
884 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
886 #define EXT4_MAX_REC_LEN ((1<<16)-1)
889 * Hash Tree Directory indexing
890 * (c) Daniel Phillips, 2001
893 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
894 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
895 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
896 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
897 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
899 /* Legal values for the dx_root hash_version field: */
901 #define DX_HASH_LEGACY 0
902 #define DX_HASH_HALF_MD4 1
903 #define DX_HASH_TEA 2
904 #define DX_HASH_LEGACY_UNSIGNED 3
905 #define DX_HASH_HALF_MD4_UNSIGNED 4
906 #define DX_HASH_TEA_UNSIGNED 5
910 /* hash info structure used by the directory hash */
919 #define EXT4_HTREE_EOF 0x7fffffff
922 * Control parameters used by ext4_htree_next_block
924 #define HASH_NB_ALWAYS 1
928 * Describe an inode's exact location on disk and in memory
932 struct buffer_head
*bh
;
933 unsigned long offset
;
934 ext4_group_t block_group
;
937 static inline struct ext4_inode
*ext4_raw_inode(struct ext4_iloc
*iloc
)
939 return (struct ext4_inode
*) (iloc
->bh
->b_data
+ iloc
->offset
);
943 * This structure is stuffed into the struct file's private_data field
944 * for directories. It is where we put information so that we can do
945 * readdir operations in hash tree order.
947 struct dir_private_info
{
949 struct rb_node
*curr_node
;
950 struct fname
*extra_fname
;
953 __u32 curr_minor_hash
;
957 /* calculate the first block number of the group */
958 static inline ext4_fsblk_t
959 ext4_group_first_block_no(struct super_block
*sb
, ext4_group_t group_no
)
961 return group_no
* (ext4_fsblk_t
)EXT4_BLOCKS_PER_GROUP(sb
) +
962 le32_to_cpu(EXT4_SB(sb
)->s_es
->s_first_data_block
);
966 * Special error return code only used by dx_probe() and its callers.
968 #define ERR_BAD_DX_DIR -75000
970 void ext4_get_group_no_and_offset(struct super_block
*sb
, ext4_fsblk_t blocknr
,
971 ext4_group_t
*blockgrpp
, ext4_grpblk_t
*offsetp
);
973 extern struct proc_dir_entry
*ext4_proc_root
;
975 #ifdef CONFIG_PROC_FS
976 extern const struct file_operations ext4_ui_proc_fops
;
978 #define EXT4_PROC_HANDLER(name, var) \
980 proc = proc_create_data(name, mode, sbi->s_proc, \
981 &ext4_ui_proc_fops, &sbi->s_##var); \
982 if (proc == NULL) { \
983 printk(KERN_ERR "EXT4-fs: can't create %s\n", name); \
988 #define EXT4_PROC_HANDLER(name, var)
992 * Function prototypes
996 * Ok, these declarations are also in <linux/kernel.h> but none of the
997 * ext4 source programs needs to include it so they are duplicated here.
999 # define NORET_TYPE /**/
1000 # define ATTRIB_NORET __attribute__((noreturn))
1001 # define NORET_AND noreturn,
1004 extern unsigned int ext4_count_free(struct buffer_head
*, unsigned);
1007 extern unsigned int ext4_block_group(struct super_block
*sb
,
1008 ext4_fsblk_t blocknr
);
1009 extern ext4_grpblk_t
ext4_block_group_offset(struct super_block
*sb
,
1010 ext4_fsblk_t blocknr
);
1011 extern int ext4_bg_has_super(struct super_block
*sb
, ext4_group_t group
);
1012 extern unsigned long ext4_bg_num_gdb(struct super_block
*sb
,
1013 ext4_group_t group
);
1014 extern ext4_fsblk_t
ext4_new_meta_blocks(handle_t
*handle
, struct inode
*inode
,
1015 ext4_fsblk_t goal
, unsigned long *count
, int *errp
);
1016 extern int ext4_claim_free_blocks(struct ext4_sb_info
*sbi
, s64 nblocks
);
1017 extern int ext4_has_free_blocks(struct ext4_sb_info
*sbi
, s64 nblocks
);
1018 extern void ext4_free_blocks(handle_t
*handle
, struct inode
*inode
,
1019 ext4_fsblk_t block
, unsigned long count
, int metadata
);
1020 extern void ext4_add_groupblocks(handle_t
*handle
, struct super_block
*sb
,
1021 ext4_fsblk_t block
, unsigned long count
);
1022 extern ext4_fsblk_t
ext4_count_free_blocks(struct super_block
*);
1023 extern void ext4_check_blocks_bitmap(struct super_block
*);
1024 extern struct ext4_group_desc
* ext4_get_group_desc(struct super_block
* sb
,
1025 ext4_group_t block_group
,
1026 struct buffer_head
** bh
);
1027 extern int ext4_should_retry_alloc(struct super_block
*sb
, int *retries
);
1030 extern int ext4_check_dir_entry(const char *, struct inode
*,
1031 struct ext4_dir_entry_2
*,
1032 struct buffer_head
*, unsigned int);
1033 extern int ext4_htree_store_dirent(struct file
*dir_file
, __u32 hash
,
1035 struct ext4_dir_entry_2
*dirent
);
1036 extern void ext4_htree_free_dir_info(struct dir_private_info
*p
);
1039 extern int ext4_sync_file(struct file
*, struct dentry
*, int);
1042 extern int ext4fs_dirhash(const char *name
, int len
, struct
1043 dx_hash_info
*hinfo
);
1046 extern struct inode
* ext4_new_inode(handle_t
*, struct inode
*, int);
1047 extern void ext4_free_inode(handle_t
*, struct inode
*);
1048 extern struct inode
* ext4_orphan_get(struct super_block
*, unsigned long);
1049 extern unsigned long ext4_count_free_inodes(struct super_block
*);
1050 extern unsigned long ext4_count_dirs(struct super_block
*);
1051 extern void ext4_check_inodes_bitmap(struct super_block
*);
1054 extern long ext4_mb_stats
;
1055 extern long ext4_mb_max_to_scan
;
1056 extern int ext4_mb_init(struct super_block
*, int);
1057 extern int ext4_mb_release(struct super_block
*);
1058 extern ext4_fsblk_t
ext4_mb_new_blocks(handle_t
*,
1059 struct ext4_allocation_request
*, int *);
1060 extern int ext4_mb_reserve_blocks(struct super_block
*, int);
1061 extern void ext4_discard_preallocations(struct inode
*);
1062 extern int __init
init_ext4_mballoc(void);
1063 extern void exit_ext4_mballoc(void);
1064 extern void ext4_mb_free_blocks(handle_t
*, struct inode
*,
1065 unsigned long, unsigned long, int, unsigned long *);
1066 extern int ext4_mb_add_groupinfo(struct super_block
*sb
,
1067 ext4_group_t i
, struct ext4_group_desc
*desc
);
1068 extern void ext4_mb_update_group_info(struct ext4_group_info
*grp
,
1070 extern int ext4_mb_get_buddy_cache_lock(struct super_block
*, ext4_group_t
);
1071 extern void ext4_mb_put_buddy_cache_lock(struct super_block
*,
1074 int ext4_forget(handle_t
*handle
, int is_metadata
, struct inode
*inode
,
1075 struct buffer_head
*bh
, ext4_fsblk_t blocknr
);
1076 struct buffer_head
*ext4_getblk(handle_t
*, struct inode
*,
1077 ext4_lblk_t
, int, int *);
1078 struct buffer_head
*ext4_bread(handle_t
*, struct inode
*,
1079 ext4_lblk_t
, int, int *);
1080 int ext4_get_block(struct inode
*inode
, sector_t iblock
,
1081 struct buffer_head
*bh_result
, int create
);
1083 extern struct inode
*ext4_iget(struct super_block
*, unsigned long);
1084 extern int ext4_write_inode(struct inode
*, int);
1085 extern int ext4_setattr(struct dentry
*, struct iattr
*);
1086 extern int ext4_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
1087 struct kstat
*stat
);
1088 extern void ext4_delete_inode(struct inode
*);
1089 extern int ext4_sync_inode(handle_t
*, struct inode
*);
1090 extern void ext4_dirty_inode(struct inode
*);
1091 extern int ext4_change_inode_journal_flag(struct inode
*, int);
1092 extern int ext4_get_inode_loc(struct inode
*, struct ext4_iloc
*);
1093 extern int ext4_can_truncate(struct inode
*inode
);
1094 extern void ext4_truncate(struct inode
*);
1095 extern void ext4_set_inode_flags(struct inode
*);
1096 extern void ext4_get_inode_flags(struct ext4_inode_info
*);
1097 extern void ext4_set_aops(struct inode
*inode
);
1098 extern int ext4_writepage_trans_blocks(struct inode
*);
1099 extern int ext4_meta_trans_blocks(struct inode
*, int nrblocks
, int idxblocks
);
1100 extern int ext4_chunk_trans_blocks(struct inode
*, int nrblocks
);
1101 extern int ext4_block_truncate_page(handle_t
*handle
,
1102 struct address_space
*mapping
, loff_t from
);
1103 extern int ext4_page_mkwrite(struct vm_area_struct
*vma
, struct page
*page
);
1104 extern qsize_t
ext4_get_reserved_space(struct inode
*inode
);
1107 extern long ext4_ioctl(struct file
*, unsigned int, unsigned long);
1108 extern long ext4_compat_ioctl(struct file
*, unsigned int, unsigned long);
1111 extern int ext4_ext_migrate(struct inode
*);
1114 extern unsigned int ext4_rec_len_from_disk(__le16 dlen
, unsigned blocksize
);
1115 extern __le16
ext4_rec_len_to_disk(unsigned len
, unsigned blocksize
);
1116 extern int ext4_orphan_add(handle_t
*, struct inode
*);
1117 extern int ext4_orphan_del(handle_t
*, struct inode
*);
1118 extern int ext4_htree_fill_tree(struct file
*dir_file
, __u32 start_hash
,
1119 __u32 start_minor_hash
, __u32
*next_hash
);
1122 extern int ext4_group_add(struct super_block
*sb
,
1123 struct ext4_new_group_data
*input
);
1124 extern int ext4_group_extend(struct super_block
*sb
,
1125 struct ext4_super_block
*es
,
1126 ext4_fsblk_t n_blocks_count
);
1129 extern void ext4_error(struct super_block
*, const char *, const char *, ...)
1130 __attribute__ ((format (printf
, 3, 4)));
1131 extern void __ext4_std_error(struct super_block
*, const char *, int);
1132 extern void ext4_abort(struct super_block
*, const char *, const char *, ...)
1133 __attribute__ ((format (printf
, 3, 4)));
1134 extern void ext4_warning(struct super_block
*, const char *, const char *, ...)
1135 __attribute__ ((format (printf
, 3, 4)));
1136 extern void ext4_grp_locked_error(struct super_block
*, ext4_group_t
,
1137 const char *, const char *, ...)
1138 __attribute__ ((format (printf
, 4, 5)));
1139 extern void ext4_update_dynamic_rev(struct super_block
*sb
);
1140 extern int ext4_update_compat_feature(handle_t
*handle
, struct super_block
*sb
,
1142 extern int ext4_update_rocompat_feature(handle_t
*handle
,
1143 struct super_block
*sb
, __u32 rocompat
);
1144 extern int ext4_update_incompat_feature(handle_t
*handle
,
1145 struct super_block
*sb
, __u32 incompat
);
1146 extern ext4_fsblk_t
ext4_block_bitmap(struct super_block
*sb
,
1147 struct ext4_group_desc
*bg
);
1148 extern ext4_fsblk_t
ext4_inode_bitmap(struct super_block
*sb
,
1149 struct ext4_group_desc
*bg
);
1150 extern ext4_fsblk_t
ext4_inode_table(struct super_block
*sb
,
1151 struct ext4_group_desc
*bg
);
1152 extern __u32
ext4_free_blks_count(struct super_block
*sb
,
1153 struct ext4_group_desc
*bg
);
1154 extern __u32
ext4_free_inodes_count(struct super_block
*sb
,
1155 struct ext4_group_desc
*bg
);
1156 extern __u32
ext4_used_dirs_count(struct super_block
*sb
,
1157 struct ext4_group_desc
*bg
);
1158 extern __u32
ext4_itable_unused_count(struct super_block
*sb
,
1159 struct ext4_group_desc
*bg
);
1160 extern void ext4_block_bitmap_set(struct super_block
*sb
,
1161 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1162 extern void ext4_inode_bitmap_set(struct super_block
*sb
,
1163 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1164 extern void ext4_inode_table_set(struct super_block
*sb
,
1165 struct ext4_group_desc
*bg
, ext4_fsblk_t blk
);
1166 extern void ext4_free_blks_set(struct super_block
*sb
,
1167 struct ext4_group_desc
*bg
, __u32 count
);
1168 extern void ext4_free_inodes_set(struct super_block
*sb
,
1169 struct ext4_group_desc
*bg
, __u32 count
);
1170 extern void ext4_used_dirs_set(struct super_block
*sb
,
1171 struct ext4_group_desc
*bg
, __u32 count
);
1172 extern void ext4_itable_unused_set(struct super_block
*sb
,
1173 struct ext4_group_desc
*bg
, __u32 count
);
1175 static inline ext4_fsblk_t
ext4_blocks_count(struct ext4_super_block
*es
)
1177 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_blocks_count_hi
) << 32) |
1178 le32_to_cpu(es
->s_blocks_count_lo
);
1181 static inline ext4_fsblk_t
ext4_r_blocks_count(struct ext4_super_block
*es
)
1183 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_r_blocks_count_hi
) << 32) |
1184 le32_to_cpu(es
->s_r_blocks_count_lo
);
1187 static inline ext4_fsblk_t
ext4_free_blocks_count(struct ext4_super_block
*es
)
1189 return ((ext4_fsblk_t
)le32_to_cpu(es
->s_free_blocks_count_hi
) << 32) |
1190 le32_to_cpu(es
->s_free_blocks_count_lo
);
1193 static inline void ext4_blocks_count_set(struct ext4_super_block
*es
,
1196 es
->s_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1197 es
->s_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1200 static inline void ext4_free_blocks_count_set(struct ext4_super_block
*es
,
1203 es
->s_free_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1204 es
->s_free_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1207 static inline void ext4_r_blocks_count_set(struct ext4_super_block
*es
,
1210 es
->s_r_blocks_count_lo
= cpu_to_le32((u32
)blk
);
1211 es
->s_r_blocks_count_hi
= cpu_to_le32(blk
>> 32);
1214 static inline loff_t
ext4_isize(struct ext4_inode
*raw_inode
)
1216 if (S_ISREG(le16_to_cpu(raw_inode
->i_mode
)))
1217 return ((loff_t
)le32_to_cpu(raw_inode
->i_size_high
) << 32) |
1218 le32_to_cpu(raw_inode
->i_size_lo
);
1220 return (loff_t
) le32_to_cpu(raw_inode
->i_size_lo
);
1223 static inline void ext4_isize_set(struct ext4_inode
*raw_inode
, loff_t i_size
)
1225 raw_inode
->i_size_lo
= cpu_to_le32(i_size
);
1226 raw_inode
->i_size_high
= cpu_to_le32(i_size
>> 32);
1230 struct ext4_group_info
*ext4_get_group_info(struct super_block
*sb
,
1233 struct ext4_group_info
***grp_info
;
1234 long indexv
, indexh
;
1235 grp_info
= EXT4_SB(sb
)->s_group_info
;
1236 indexv
= group
>> (EXT4_DESC_PER_BLOCK_BITS(sb
));
1237 indexh
= group
& ((EXT4_DESC_PER_BLOCK(sb
)) - 1);
1238 return grp_info
[indexv
][indexh
];
1242 static inline ext4_group_t
ext4_flex_group(struct ext4_sb_info
*sbi
,
1243 ext4_group_t block_group
)
1245 return block_group
>> sbi
->s_log_groups_per_flex
;
1248 static inline unsigned int ext4_flex_bg_size(struct ext4_sb_info
*sbi
)
1250 return 1 << sbi
->s_log_groups_per_flex
;
1253 #define ext4_std_error(sb, errno) \
1256 __ext4_std_error((sb), __func__, (errno)); \
1260 /* Each CPU can accumulate percpu_counter_batch blocks in their local
1261 * counters. So we need to make sure we have free blocks more
1262 * than percpu_counter_batch * nr_cpu_ids. Also add a window of 4 times.
1264 #define EXT4_FREEBLOCKS_WATERMARK (4 * (percpu_counter_batch * nr_cpu_ids))
1266 #define EXT4_FREEBLOCKS_WATERMARK 0
1269 static inline void ext4_update_i_disksize(struct inode
*inode
, loff_t newsize
)
1272 * XXX: replace with spinlock if seen contended -bzzz
1274 down_write(&EXT4_I(inode
)->i_data_sem
);
1275 if (newsize
> EXT4_I(inode
)->i_disksize
)
1276 EXT4_I(inode
)->i_disksize
= newsize
;
1277 up_write(&EXT4_I(inode
)->i_data_sem
);
1281 struct ext4_group_info
{
1282 unsigned long bb_state
;
1283 struct rb_root bb_free_root
;
1284 unsigned short bb_first_free
;
1285 unsigned short bb_free
;
1286 unsigned short bb_fragments
;
1287 struct list_head bb_prealloc_list
;
1291 struct rw_semaphore alloc_sem
;
1292 unsigned short bb_counters
[];
1295 #define EXT4_GROUP_INFO_NEED_INIT_BIT 0
1296 #define EXT4_GROUP_INFO_LOCKED_BIT 1
1298 #define EXT4_MB_GRP_NEED_INIT(grp) \
1299 (test_bit(EXT4_GROUP_INFO_NEED_INIT_BIT, &((grp)->bb_state)))
1301 static inline void ext4_lock_group(struct super_block
*sb
, ext4_group_t group
)
1303 struct ext4_group_info
*grinfo
= ext4_get_group_info(sb
, group
);
1305 bit_spin_lock(EXT4_GROUP_INFO_LOCKED_BIT
, &(grinfo
->bb_state
));
1308 static inline void ext4_unlock_group(struct super_block
*sb
,
1311 struct ext4_group_info
*grinfo
= ext4_get_group_info(sb
, group
);
1313 bit_spin_unlock(EXT4_GROUP_INFO_LOCKED_BIT
, &(grinfo
->bb_state
));
1316 static inline int ext4_is_group_locked(struct super_block
*sb
,
1319 struct ext4_group_info
*grinfo
= ext4_get_group_info(sb
, group
);
1321 return bit_spin_is_locked(EXT4_GROUP_INFO_LOCKED_BIT
,
1322 &(grinfo
->bb_state
));
1326 * Inodes and files operations
1330 extern const struct file_operations ext4_dir_operations
;
1333 extern const struct inode_operations ext4_file_inode_operations
;
1334 extern const struct file_operations ext4_file_operations
;
1337 extern const struct inode_operations ext4_dir_inode_operations
;
1338 extern const struct inode_operations ext4_special_inode_operations
;
1341 extern const struct inode_operations ext4_symlink_inode_operations
;
1342 extern const struct inode_operations ext4_fast_symlink_inode_operations
;
1345 extern int ext4_ext_tree_init(handle_t
*handle
, struct inode
*);
1346 extern int ext4_ext_writepage_trans_blocks(struct inode
*, int);
1347 extern int ext4_ext_index_trans_blocks(struct inode
*inode
, int nrblocks
,
1349 extern int ext4_ext_get_blocks(handle_t
*handle
, struct inode
*inode
,
1350 ext4_lblk_t iblock
, unsigned int max_blocks
,
1351 struct buffer_head
*bh_result
,
1352 int create
, int extend_disksize
);
1353 extern void ext4_ext_truncate(struct inode
*);
1354 extern void ext4_ext_init(struct super_block
*);
1355 extern void ext4_ext_release(struct super_block
*);
1356 extern long ext4_fallocate(struct inode
*inode
, int mode
, loff_t offset
,
1358 extern int ext4_get_blocks_wrap(handle_t
*handle
, struct inode
*inode
,
1359 sector_t block
, unsigned int max_blocks
,
1360 struct buffer_head
*bh
, int create
,
1361 int extend_disksize
, int flag
);
1362 extern int ext4_fiemap(struct inode
*inode
, struct fiemap_extent_info
*fieinfo
,
1363 __u64 start
, __u64 len
);
1366 * Add new method to test wether block and inode bitmaps are properly
1367 * initialized. With uninit_bg reading the block from disk is not enough
1368 * to mark the bitmap uptodate. We need to also zero-out the bitmap
1370 #define BH_BITMAP_UPTODATE BH_JBDPrivateStart
1372 static inline int bitmap_uptodate(struct buffer_head
*bh
)
1374 return (buffer_uptodate(bh
) &&
1375 test_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
));
1377 static inline void set_bitmap_uptodate(struct buffer_head
*bh
)
1379 set_bit(BH_BITMAP_UPTODATE
, &(bh
)->b_state
);
1382 #endif /* __KERNEL__ */
1384 #endif /* _EXT4_H */