2 * linux/include/linux/ext4_fs.h
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
16 #ifndef _LINUX_EXT4_FS_H
17 #define _LINUX_EXT4_FS_H
19 #include <linux/types.h>
20 #include <linux/blkdev.h>
21 #include <linux/magic.h>
24 * The second extended filesystem constants/structures
28 * Define EXT4FS_DEBUG to produce debug messages
33 * Define EXT4_RESERVATION to reserve data blocks for expanding files
35 #define EXT4_DEFAULT_RESERVE_BLOCKS 8
36 /*max window size: 1024(direct blocks) + 3([t,d]indirect blocks) */
37 #define EXT4_MAX_RESERVE_BLOCKS 1027
38 #define EXT4_RESERVE_WINDOW_NOT_ALLOCATED 0
44 #define ext4_debug(f, a...) \
46 printk (KERN_DEBUG "EXT4-fs DEBUG (%s, %d): %s:", \
47 __FILE__, __LINE__, __FUNCTION__); \
48 printk (KERN_DEBUG f, ## a); \
51 #define ext4_debug(f, a...) do {} while (0)
55 * Special inodes numbers
57 #define EXT4_BAD_INO 1 /* Bad blocks inode */
58 #define EXT4_ROOT_INO 2 /* Root inode */
59 #define EXT4_BOOT_LOADER_INO 5 /* Boot loader inode */
60 #define EXT4_UNDEL_DIR_INO 6 /* Undelete directory inode */
61 #define EXT4_RESIZE_INO 7 /* Reserved group descriptors inode */
62 #define EXT4_JOURNAL_INO 8 /* Journal inode */
64 /* First non-reserved inode for old ext4 filesystems */
65 #define EXT4_GOOD_OLD_FIRST_INO 11
68 * Maximal count of links to a file
70 #define EXT4_LINK_MAX 65000
73 * Macro-instructions used to manage several block sizes
75 #define EXT4_MIN_BLOCK_SIZE 1024
76 #define EXT4_MAX_BLOCK_SIZE 65536
77 #define EXT4_MIN_BLOCK_LOG_SIZE 10
79 # define EXT4_BLOCK_SIZE(s) ((s)->s_blocksize)
81 # define EXT4_BLOCK_SIZE(s) (EXT4_MIN_BLOCK_SIZE << (s)->s_log_block_size)
83 #define EXT4_ADDR_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / sizeof (__u32))
85 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_blocksize_bits)
87 # define EXT4_BLOCK_SIZE_BITS(s) ((s)->s_log_block_size + 10)
90 #define EXT4_ADDR_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_addr_per_block_bits)
91 #define EXT4_INODE_SIZE(s) (EXT4_SB(s)->s_inode_size)
92 #define EXT4_FIRST_INO(s) (EXT4_SB(s)->s_first_ino)
94 #define EXT4_INODE_SIZE(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
95 EXT4_GOOD_OLD_INODE_SIZE : \
97 #define EXT4_FIRST_INO(s) (((s)->s_rev_level == EXT4_GOOD_OLD_REV) ? \
98 EXT4_GOOD_OLD_FIRST_INO : \
101 #define EXT4_BLOCK_ALIGN(size, blkbits) ALIGN((size), (1 << (blkbits)))
104 * Structure of a blocks group descriptor
106 struct ext4_group_desc
108 __le32 bg_block_bitmap_lo; /* Blocks bitmap block */
109 __le32 bg_inode_bitmap_lo; /* Inodes bitmap block */
110 __le32 bg_inode_table_lo; /* Inodes table block */
111 __le16 bg_free_blocks_count; /* Free blocks count */
112 __le16 bg_free_inodes_count; /* Free inodes count */
113 __le16 bg_used_dirs_count; /* Directories count */
114 __le16 bg_flags; /* EXT4_BG_flags (INODE_UNINIT, etc) */
115 __u32 bg_reserved[2]; /* Likely block/inode bitmap checksum */
116 __le16 bg_itable_unused; /* Unused inodes count */
117 __le16 bg_checksum; /* crc16(sb_uuid+group+desc) */
118 __le32 bg_block_bitmap_hi; /* Blocks bitmap block MSB */
119 __le32 bg_inode_bitmap_hi; /* Inodes bitmap block MSB */
120 __le32 bg_inode_table_hi; /* Inodes table block MSB */
123 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
124 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
125 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
128 #include <linux/ext4_fs_i.h>
129 #include <linux/ext4_fs_sb.h>
132 * Macro-instructions used to manage group descriptors
134 #define EXT4_MIN_DESC_SIZE 32
135 #define EXT4_MIN_DESC_SIZE_64BIT 64
136 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
137 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
139 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
140 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
141 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
142 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
144 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
145 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
146 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
150 * Constants relative to the data blocks
152 #define EXT4_NDIR_BLOCKS 12
153 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
154 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
155 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
156 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
161 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
162 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
163 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
164 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
165 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
166 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
167 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
168 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
169 /* Reserved for compression usage... */
170 #define EXT4_DIRTY_FL 0x00000100
171 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
172 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
173 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
174 /* End compression flags --- maybe not all used */
175 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
176 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
177 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
178 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
179 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
180 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
181 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
182 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
183 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
185 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
186 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
189 * Inode dynamic state flags
191 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
192 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
193 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
194 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
196 /* Used to pass group descriptor data when online resize is done */
197 struct ext4_new_group_input {
198 __u32 group; /* Group number for this data */
199 __u64 block_bitmap; /* Absolute block number of block bitmap */
200 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
201 __u64 inode_table; /* Absolute block number of inode table start */
202 __u32 blocks_count; /* Total number of blocks in this group */
203 __u16 reserved_blocks; /* Number of reserved blocks in this group */
207 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
208 struct ext4_new_group_data {
214 __u16 reserved_blocks;
216 __u32 free_blocks_count;
220 * Following is used by preallocation code to tell get_blocks() that we
221 * want uninitialzed extents.
223 #define EXT4_CREATE_UNINITIALIZED_EXT 2
228 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
229 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
230 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
231 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
232 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
233 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
234 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
235 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
236 #ifdef CONFIG_JBD2_DEBUG
237 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
239 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
240 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
243 * ioctl commands in 32 bit emulation
245 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
246 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
247 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
248 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
249 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
250 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
251 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
252 #ifdef CONFIG_JBD2_DEBUG
253 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
255 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
256 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
262 struct ext4_mount_options {
263 unsigned long s_mount_opt;
266 unsigned long s_commit_interval;
269 char *s_qf_names[MAXQUOTAS];
274 * Structure of an inode on the disk
277 __le16 i_mode; /* File mode */
278 __le16 i_uid; /* Low 16 bits of Owner Uid */
279 __le32 i_size_lo; /* Size in bytes */
280 __le32 i_atime; /* Access time */
281 __le32 i_ctime; /* Inode Change time */
282 __le32 i_mtime; /* Modification time */
283 __le32 i_dtime; /* Deletion Time */
284 __le16 i_gid; /* Low 16 bits of Group Id */
285 __le16 i_links_count; /* Links count */
286 __le32 i_blocks_lo; /* Blocks count */
287 __le32 i_flags; /* File flags */
293 __u32 h_i_translator;
298 } osd1; /* OS dependent 1 */
299 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
300 __le32 i_generation; /* File version (for NFS) */
301 __le32 i_file_acl_lo; /* File ACL */
303 __le32 i_obso_faddr; /* Obsoleted fragment address */
306 __le16 l_i_blocks_high; /* were l_i_reserved1 */
307 __le16 l_i_file_acl_high;
308 __le16 l_i_uid_high; /* these 2 fields */
309 __le16 l_i_gid_high; /* were reserved2[0] */
313 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
320 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
321 __le16 m_i_file_acl_high;
322 __u32 m_i_reserved2[2];
324 } osd2; /* OS dependent 2 */
325 __le16 i_extra_isize;
327 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
328 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
329 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
330 __le32 i_crtime; /* File Creation time */
331 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
335 #define EXT4_EPOCH_BITS 2
336 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
337 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
340 * Extended fields will fit into an inode if the filesystem was formatted
341 * with large inodes (-I 256 or larger) and there are not currently any EAs
342 * consuming all of the available space. For new inodes we always reserve
343 * enough space for the kernel's known extended fields, but for inodes
344 * created with an old kernel this might not have been the case. None of
345 * the extended inode fields is critical for correct filesystem operation.
346 * This macro checks if a certain field fits in the inode. Note that
347 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
349 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
350 ((offsetof(typeof(*ext4_inode), field) + \
351 sizeof((ext4_inode)->field)) \
352 <= (EXT4_GOOD_OLD_INODE_SIZE + \
353 (einode)->i_extra_isize)) \
355 static inline __le32 ext4_encode_extra_time(struct timespec *time)
357 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
358 time->tv_sec >> 32 : 0) |
359 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
362 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
364 if (sizeof(time->tv_sec) > 4)
365 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
367 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
370 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
372 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
373 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
374 (raw_inode)->xtime ## _extra = \
375 ext4_encode_extra_time(&(inode)->xtime); \
378 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
380 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
381 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
382 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
383 (raw_inode)->xtime ## _extra = \
384 ext4_encode_extra_time(&(einode)->xtime); \
387 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
389 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
390 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
391 ext4_decode_extra_time(&(inode)->xtime, \
392 raw_inode->xtime ## _extra); \
395 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
397 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
398 (einode)->xtime.tv_sec = \
399 (signed)le32_to_cpu((raw_inode)->xtime); \
400 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
401 ext4_decode_extra_time(&(einode)->xtime, \
402 raw_inode->xtime ## _extra); \
405 #if defined(__KERNEL__) || defined(__linux__)
406 #define i_reserved1 osd1.linux1.l_i_reserved1
407 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
408 #define i_blocks_high osd2.linux2.l_i_blocks_high
409 #define i_uid_low i_uid
410 #define i_gid_low i_gid
411 #define i_uid_high osd2.linux2.l_i_uid_high
412 #define i_gid_high osd2.linux2.l_i_gid_high
413 #define i_reserved2 osd2.linux2.l_i_reserved2
415 #elif defined(__GNU__)
417 #define i_translator osd1.hurd1.h_i_translator
418 #define i_uid_high osd2.hurd2.h_i_uid_high
419 #define i_gid_high osd2.hurd2.h_i_gid_high
420 #define i_author osd2.hurd2.h_i_author
422 #elif defined(__masix__)
424 #define i_reserved1 osd1.masix1.m_i_reserved1
425 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
426 #define i_reserved2 osd2.masix2.m_i_reserved2
428 #endif /* defined(__KERNEL__) || defined(__linux__) */
433 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
434 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
435 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
440 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
441 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
442 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
443 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
444 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
445 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
446 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
447 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
448 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
449 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
450 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
451 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
452 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
453 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
454 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
455 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
456 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
457 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
458 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
459 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
460 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
461 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
462 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
463 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
464 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
466 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
467 #ifndef _LINUX_EXT2_FS_H
468 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
469 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
470 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
473 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
474 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
475 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
478 #define ext4_set_bit ext2_set_bit
479 #define ext4_set_bit_atomic ext2_set_bit_atomic
480 #define ext4_clear_bit ext2_clear_bit
481 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
482 #define ext4_test_bit ext2_test_bit
483 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
484 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
487 * Maximal mount counts between two filesystem checks
489 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
490 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
493 * Behaviour when detecting errors
495 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
496 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
497 #define EXT4_ERRORS_PANIC 3 /* Panic */
498 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
501 * Structure of the super block
503 struct ext4_super_block {
504 /*00*/ __le32 s_inodes_count; /* Inodes count */
505 __le32 s_blocks_count_lo; /* Blocks count */
506 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
507 __le32 s_free_blocks_count_lo; /* Free blocks count */
508 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
509 __le32 s_first_data_block; /* First Data Block */
510 __le32 s_log_block_size; /* Block size */
511 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
512 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
513 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
514 __le32 s_inodes_per_group; /* # Inodes per group */
515 __le32 s_mtime; /* Mount time */
516 /*30*/ __le32 s_wtime; /* Write time */
517 __le16 s_mnt_count; /* Mount count */
518 __le16 s_max_mnt_count; /* Maximal mount count */
519 __le16 s_magic; /* Magic signature */
520 __le16 s_state; /* File system state */
521 __le16 s_errors; /* Behaviour when detecting errors */
522 __le16 s_minor_rev_level; /* minor revision level */
523 /*40*/ __le32 s_lastcheck; /* time of last check */
524 __le32 s_checkinterval; /* max. time between checks */
525 __le32 s_creator_os; /* OS */
526 __le32 s_rev_level; /* Revision level */
527 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
528 __le16 s_def_resgid; /* Default gid for reserved blocks */
530 * These fields are for EXT4_DYNAMIC_REV superblocks only.
532 * Note: the difference between the compatible feature set and
533 * the incompatible feature set is that if there is a bit set
534 * in the incompatible feature set that the kernel doesn't
535 * know about, it should refuse to mount the filesystem.
537 * e2fsck's requirements are more strict; if it doesn't know
538 * about a feature in either the compatible or incompatible
539 * feature set, it must abort and not try to meddle with
540 * things it doesn't understand...
542 __le32 s_first_ino; /* First non-reserved inode */
543 __le16 s_inode_size; /* size of inode structure */
544 __le16 s_block_group_nr; /* block group # of this superblock */
545 __le32 s_feature_compat; /* compatible feature set */
546 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
547 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
548 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
549 /*78*/ char s_volume_name[16]; /* volume name */
550 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
551 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
553 * Performance hints. Directory preallocation should only
554 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
556 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
557 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
558 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
560 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
562 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
563 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
564 __le32 s_journal_dev; /* device number of journal file */
565 __le32 s_last_orphan; /* start of list of inodes to delete */
566 __le32 s_hash_seed[4]; /* HTREE hash seed */
567 __u8 s_def_hash_version; /* Default hash version to use */
568 __u8 s_reserved_char_pad;
569 __le16 s_desc_size; /* size of group descriptor */
570 /*100*/ __le32 s_default_mount_opts;
571 __le32 s_first_meta_bg; /* First metablock block group */
572 __le32 s_mkfs_time; /* When the filesystem was created */
573 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
574 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
575 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
576 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
577 __le32 s_free_blocks_count_hi; /* Free blocks count */
578 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
579 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
580 __le32 s_flags; /* Miscellaneous flags */
581 __le16 s_raid_stride; /* RAID stride */
582 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
583 __le64 s_mmp_block; /* Block for multi-mount protection */
584 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
585 __u32 s_reserved[163]; /* Padding to the end of the block */
589 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
591 return sb->s_fs_info;
593 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
595 return container_of(inode, struct ext4_inode_info, vfs_inode);
598 static inline struct timespec ext4_current_time(struct inode *inode)
600 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
601 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
605 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
607 return ino == EXT4_ROOT_INO ||
608 ino == EXT4_JOURNAL_INO ||
609 ino == EXT4_RESIZE_INO ||
610 (ino >= EXT4_FIRST_INO(sb) &&
611 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
614 /* Assume that user mode programs are passing in an ext4fs superblock, not
615 * a kernel struct super_block. This will allow us to call the feature-test
616 * macros from user land. */
617 #define EXT4_SB(sb) (sb)
620 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
623 * Codes for operating systems
625 #define EXT4_OS_LINUX 0
626 #define EXT4_OS_HURD 1
627 #define EXT4_OS_MASIX 2
628 #define EXT4_OS_FREEBSD 3
629 #define EXT4_OS_LITES 4
634 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
635 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
637 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
638 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
640 #define EXT4_GOOD_OLD_INODE_SIZE 128
643 * Feature set definitions
646 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
647 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
648 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
649 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
650 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
651 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
652 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
653 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
654 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
655 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
656 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
657 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
658 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
659 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
660 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
661 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
662 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
663 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
665 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
666 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
667 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
668 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
669 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
670 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
672 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
673 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
674 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
675 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
676 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
677 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
678 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
680 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
681 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
682 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
683 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
684 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
685 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
686 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
687 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
688 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
690 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
691 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
692 EXT4_FEATURE_INCOMPAT_RECOVER| \
693 EXT4_FEATURE_INCOMPAT_META_BG| \
694 EXT4_FEATURE_INCOMPAT_EXTENTS| \
695 EXT4_FEATURE_INCOMPAT_64BIT| \
696 EXT4_FEATURE_INCOMPAT_FLEX_BG)
697 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
698 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
699 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
700 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
701 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
702 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
703 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
706 * Default values for user and/or group using reserved blocks
708 #define EXT4_DEF_RESUID 0
709 #define EXT4_DEF_RESGID 0
712 * Default mount options
714 #define EXT4_DEFM_DEBUG 0x0001
715 #define EXT4_DEFM_BSDGROUPS 0x0002
716 #define EXT4_DEFM_XATTR_USER 0x0004
717 #define EXT4_DEFM_ACL 0x0008
718 #define EXT4_DEFM_UID16 0x0010
719 #define EXT4_DEFM_JMODE 0x0060
720 #define EXT4_DEFM_JMODE_DATA 0x0020
721 #define EXT4_DEFM_JMODE_ORDERED 0x0040
722 #define EXT4_DEFM_JMODE_WBACK 0x0060
725 * Structure of a directory entry
727 #define EXT4_NAME_LEN 255
729 struct ext4_dir_entry {
730 __le32 inode; /* Inode number */
731 __le16 rec_len; /* Directory entry length */
732 __le16 name_len; /* Name length */
733 char name[EXT4_NAME_LEN]; /* File name */
737 * The new version of the directory entry. Since EXT4 structures are
738 * stored in intel byte order, and the name_len field could never be
739 * bigger than 255 chars, it's safe to reclaim the extra byte for the
742 struct ext4_dir_entry_2 {
743 __le32 inode; /* Inode number */
744 __le16 rec_len; /* Directory entry length */
745 __u8 name_len; /* Name length */
747 char name[EXT4_NAME_LEN]; /* File name */
751 * Ext4 directory file types. Only the low 3 bits are used. The
752 * other bits are reserved for now.
754 #define EXT4_FT_UNKNOWN 0
755 #define EXT4_FT_REG_FILE 1
756 #define EXT4_FT_DIR 2
757 #define EXT4_FT_CHRDEV 3
758 #define EXT4_FT_BLKDEV 4
759 #define EXT4_FT_FIFO 5
760 #define EXT4_FT_SOCK 6
761 #define EXT4_FT_SYMLINK 7
763 #define EXT4_FT_MAX 8
766 * EXT4_DIR_PAD defines the directory entries boundaries
768 * NOTE: It must be a multiple of 4
770 #define EXT4_DIR_PAD 4
771 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
772 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
774 #define EXT4_MAX_REC_LEN ((1<<16)-1)
776 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
778 unsigned len = le16_to_cpu(dlen);
780 if (len == EXT4_MAX_REC_LEN)
785 static inline __le16 ext4_rec_len_to_disk(unsigned len)
787 if (len == (1 << 16))
788 return cpu_to_le16(EXT4_MAX_REC_LEN);
789 else if (len > (1 << 16))
791 return cpu_to_le16(len);
795 * Hash Tree Directory indexing
796 * (c) Daniel Phillips, 2001
799 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
800 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
801 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
802 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
803 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
805 /* Legal values for the dx_root hash_version field: */
807 #define DX_HASH_LEGACY 0
808 #define DX_HASH_HALF_MD4 1
809 #define DX_HASH_TEA 2
813 /* hash info structure used by the directory hash */
822 #define EXT4_HTREE_EOF 0x7fffffff
825 * Control parameters used by ext4_htree_next_block
827 #define HASH_NB_ALWAYS 1
831 * Describe an inode's exact location on disk and in memory
835 struct buffer_head *bh;
836 unsigned long offset;
837 ext4_group_t block_group;
840 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
842 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
846 * This structure is stuffed into the struct file's private_data field
847 * for directories. It is where we put information so that we can do
848 * readdir operations in hash tree order.
850 struct dir_private_info {
852 struct rb_node *curr_node;
853 struct fname *extra_fname;
856 __u32 curr_minor_hash;
860 /* calculate the first block number of the group */
861 static inline ext4_fsblk_t
862 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
864 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
865 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
869 * Special error return code only used by dx_probe() and its callers.
871 #define ERR_BAD_DX_DIR -75000
873 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
874 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
877 * Function prototypes
881 * Ok, these declarations are also in <linux/kernel.h> but none of the
882 * ext4 source programs needs to include it so they are duplicated here.
884 # define NORET_TYPE /**/
885 # define ATTRIB_NORET __attribute__((noreturn))
886 # define NORET_AND noreturn,
889 extern unsigned int ext4_block_group(struct super_block *sb,
890 ext4_fsblk_t blocknr);
891 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
892 ext4_fsblk_t blocknr);
893 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
894 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
896 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
897 ext4_fsblk_t goal, int *errp);
898 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
899 ext4_fsblk_t goal, unsigned long *count, int *errp);
900 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
901 ext4_fsblk_t goal, unsigned long *count, int *errp);
902 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
903 ext4_fsblk_t block, unsigned long count);
904 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
905 ext4_fsblk_t block, unsigned long count,
906 unsigned long *pdquot_freed_blocks);
907 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
908 extern void ext4_check_blocks_bitmap (struct super_block *);
909 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
910 ext4_group_t block_group,
911 struct buffer_head ** bh);
912 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
913 extern void ext4_init_block_alloc_info(struct inode *);
914 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
917 extern int ext4_check_dir_entry(const char *, struct inode *,
918 struct ext4_dir_entry_2 *,
919 struct buffer_head *, unsigned long);
920 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
922 struct ext4_dir_entry_2 *dirent);
923 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
926 extern int ext4_sync_file (struct file *, struct dentry *, int);
929 extern int ext4fs_dirhash(const char *name, int len, struct
930 dx_hash_info *hinfo);
933 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
934 extern void ext4_free_inode (handle_t *, struct inode *);
935 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
936 extern unsigned long ext4_count_free_inodes (struct super_block *);
937 extern unsigned long ext4_count_dirs (struct super_block *);
938 extern void ext4_check_inodes_bitmap (struct super_block *);
939 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
943 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
944 struct buffer_head *bh, ext4_fsblk_t blocknr);
945 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
946 ext4_lblk_t, int, int *);
947 struct buffer_head *ext4_bread(handle_t *, struct inode *,
948 ext4_lblk_t, int, int *);
949 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
950 ext4_lblk_t iblock, unsigned long maxblocks,
951 struct buffer_head *bh_result,
952 int create, int extend_disksize);
954 extern void ext4_read_inode (struct inode *);
955 extern int ext4_write_inode (struct inode *, int);
956 extern int ext4_setattr (struct dentry *, struct iattr *);
957 extern void ext4_delete_inode (struct inode *);
958 extern int ext4_sync_inode (handle_t *, struct inode *);
959 extern void ext4_discard_reservation (struct inode *);
960 extern void ext4_dirty_inode(struct inode *);
961 extern int ext4_change_inode_journal_flag(struct inode *, int);
962 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
963 extern void ext4_truncate (struct inode *);
964 extern void ext4_set_inode_flags(struct inode *);
965 extern void ext4_get_inode_flags(struct ext4_inode_info *);
966 extern void ext4_set_aops(struct inode *inode);
967 extern int ext4_writepage_trans_blocks(struct inode *);
968 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
969 struct address_space *mapping, loff_t from);
972 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
974 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
977 extern int ext4_orphan_add(handle_t *, struct inode *);
978 extern int ext4_orphan_del(handle_t *, struct inode *);
979 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
980 __u32 start_minor_hash, __u32 *next_hash);
983 extern int ext4_group_add(struct super_block *sb,
984 struct ext4_new_group_data *input);
985 extern int ext4_group_extend(struct super_block *sb,
986 struct ext4_super_block *es,
987 ext4_fsblk_t n_blocks_count);
990 extern void ext4_error (struct super_block *, const char *, const char *, ...)
991 __attribute__ ((format (printf, 3, 4)));
992 extern void __ext4_std_error (struct super_block *, const char *, int);
993 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
994 __attribute__ ((format (printf, 3, 4)));
995 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
996 __attribute__ ((format (printf, 3, 4)));
997 extern void ext4_update_dynamic_rev (struct super_block *sb);
998 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1000 extern int ext4_update_rocompat_feature(handle_t *handle,
1001 struct super_block *sb, __u32 rocompat);
1002 extern int ext4_update_incompat_feature(handle_t *handle,
1003 struct super_block *sb, __u32 incompat);
1004 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1005 struct ext4_group_desc *bg);
1006 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1007 struct ext4_group_desc *bg);
1008 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1009 struct ext4_group_desc *bg);
1010 extern void ext4_block_bitmap_set(struct super_block *sb,
1011 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1012 extern void ext4_inode_bitmap_set(struct super_block *sb,
1013 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1014 extern void ext4_inode_table_set(struct super_block *sb,
1015 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1017 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1019 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1020 le32_to_cpu(es->s_blocks_count_lo);
1023 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1025 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1026 le32_to_cpu(es->s_r_blocks_count_lo);
1029 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1031 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1032 le32_to_cpu(es->s_free_blocks_count_lo);
1035 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1038 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1039 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1042 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1045 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1046 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1049 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1052 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1053 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1056 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1058 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1059 le32_to_cpu(raw_inode->i_size_lo);
1062 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1064 raw_inode->i_size_lo = cpu_to_le32(i_size);
1065 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1068 #define ext4_std_error(sb, errno) \
1071 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1075 * Inodes and files operations
1079 extern const struct file_operations ext4_dir_operations;
1082 extern const struct inode_operations ext4_file_inode_operations;
1083 extern const struct file_operations ext4_file_operations;
1086 extern const struct inode_operations ext4_dir_inode_operations;
1087 extern const struct inode_operations ext4_special_inode_operations;
1090 extern const struct inode_operations ext4_symlink_inode_operations;
1091 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1094 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1095 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1096 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1098 unsigned long max_blocks, struct buffer_head *bh_result,
1099 int create, int extend_disksize);
1100 extern void ext4_ext_truncate(struct inode *, struct page *);
1101 extern void ext4_ext_init(struct super_block *);
1102 extern void ext4_ext_release(struct super_block *);
1103 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1106 ext4_get_blocks_wrap(handle_t *handle, struct inode *inode, sector_t block,
1107 unsigned long max_blocks, struct buffer_head *bh,
1108 int create, int extend_disksize)
1111 if (EXT4_I(inode)->i_flags & EXT4_EXTENTS_FL) {
1112 retval = ext4_ext_get_blocks(handle, inode,
1113 (ext4_lblk_t)block, max_blocks,
1114 bh, create, extend_disksize);
1116 retval = ext4_get_blocks_handle(handle, inode,
1117 (ext4_lblk_t)block, max_blocks,
1118 bh, create, extend_disksize);
1124 #endif /* __KERNEL__ */
1126 #endif /* _LINUX_EXT4_FS_H */