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 */
121 __le16 bg_free_blocks_count_hi;/* Free blocks count MSB */
122 __le16 bg_free_inodes_count_hi;/* Free inodes count MSB */
123 __le16 bg_used_dirs_count_hi; /* Directories count MSB */
124 __le16 bg_itable_unused_hi; /* Unused inodes count MSB */
125 __u32 bg_reserved2[3];
128 #define EXT4_BG_INODE_UNINIT 0x0001 /* Inode table/bitmap not in use */
129 #define EXT4_BG_BLOCK_UNINIT 0x0002 /* Block bitmap not in use */
130 #define EXT4_BG_INODE_ZEROED 0x0004 /* On-disk itable initialized to zero */
133 #include <linux/ext4_fs_i.h>
134 #include <linux/ext4_fs_sb.h>
137 * Macro-instructions used to manage group descriptors
139 #define EXT4_MIN_DESC_SIZE 32
140 #define EXT4_MIN_DESC_SIZE_64BIT 64
141 #define EXT4_MAX_DESC_SIZE EXT4_MIN_BLOCK_SIZE
142 #define EXT4_DESC_SIZE(s) (EXT4_SB(s)->s_desc_size)
144 # define EXT4_BLOCKS_PER_GROUP(s) (EXT4_SB(s)->s_blocks_per_group)
145 # define EXT4_DESC_PER_BLOCK(s) (EXT4_SB(s)->s_desc_per_block)
146 # define EXT4_INODES_PER_GROUP(s) (EXT4_SB(s)->s_inodes_per_group)
147 # define EXT4_DESC_PER_BLOCK_BITS(s) (EXT4_SB(s)->s_desc_per_block_bits)
149 # define EXT4_BLOCKS_PER_GROUP(s) ((s)->s_blocks_per_group)
150 # define EXT4_DESC_PER_BLOCK(s) (EXT4_BLOCK_SIZE(s) / EXT4_DESC_SIZE(s))
151 # define EXT4_INODES_PER_GROUP(s) ((s)->s_inodes_per_group)
155 * Constants relative to the data blocks
157 #define EXT4_NDIR_BLOCKS 12
158 #define EXT4_IND_BLOCK EXT4_NDIR_BLOCKS
159 #define EXT4_DIND_BLOCK (EXT4_IND_BLOCK + 1)
160 #define EXT4_TIND_BLOCK (EXT4_DIND_BLOCK + 1)
161 #define EXT4_N_BLOCKS (EXT4_TIND_BLOCK + 1)
166 #define EXT4_SECRM_FL 0x00000001 /* Secure deletion */
167 #define EXT4_UNRM_FL 0x00000002 /* Undelete */
168 #define EXT4_COMPR_FL 0x00000004 /* Compress file */
169 #define EXT4_SYNC_FL 0x00000008 /* Synchronous updates */
170 #define EXT4_IMMUTABLE_FL 0x00000010 /* Immutable file */
171 #define EXT4_APPEND_FL 0x00000020 /* writes to file may only append */
172 #define EXT4_NODUMP_FL 0x00000040 /* do not dump file */
173 #define EXT4_NOATIME_FL 0x00000080 /* do not update atime */
174 /* Reserved for compression usage... */
175 #define EXT4_DIRTY_FL 0x00000100
176 #define EXT4_COMPRBLK_FL 0x00000200 /* One or more compressed clusters */
177 #define EXT4_NOCOMPR_FL 0x00000400 /* Don't compress */
178 #define EXT4_ECOMPR_FL 0x00000800 /* Compression error */
179 /* End compression flags --- maybe not all used */
180 #define EXT4_INDEX_FL 0x00001000 /* hash-indexed directory */
181 #define EXT4_IMAGIC_FL 0x00002000 /* AFS directory */
182 #define EXT4_JOURNAL_DATA_FL 0x00004000 /* file data should be journaled */
183 #define EXT4_NOTAIL_FL 0x00008000 /* file tail should not be merged */
184 #define EXT4_DIRSYNC_FL 0x00010000 /* dirsync behaviour (directories only) */
185 #define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
186 #define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
187 #define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
188 #define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */
190 #define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
191 #define EXT4_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
194 * Inode dynamic state flags
196 #define EXT4_STATE_JDATA 0x00000001 /* journaled data exists */
197 #define EXT4_STATE_NEW 0x00000002 /* inode is newly created */
198 #define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
199 #define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
201 /* Used to pass group descriptor data when online resize is done */
202 struct ext4_new_group_input {
203 __u32 group; /* Group number for this data */
204 __u64 block_bitmap; /* Absolute block number of block bitmap */
205 __u64 inode_bitmap; /* Absolute block number of inode bitmap */
206 __u64 inode_table; /* Absolute block number of inode table start */
207 __u32 blocks_count; /* Total number of blocks in this group */
208 __u16 reserved_blocks; /* Number of reserved blocks in this group */
212 /* The struct ext4_new_group_input in kernel space, with free_blocks_count */
213 struct ext4_new_group_data {
219 __u16 reserved_blocks;
221 __u32 free_blocks_count;
225 * Following is used by preallocation code to tell get_blocks() that we
226 * want uninitialzed extents.
228 #define EXT4_CREATE_UNINITIALIZED_EXT 2
233 #define EXT4_IOC_GETFLAGS FS_IOC_GETFLAGS
234 #define EXT4_IOC_SETFLAGS FS_IOC_SETFLAGS
235 #define EXT4_IOC_GETVERSION _IOR('f', 3, long)
236 #define EXT4_IOC_SETVERSION _IOW('f', 4, long)
237 #define EXT4_IOC_GROUP_EXTEND _IOW('f', 7, unsigned long)
238 #define EXT4_IOC_GROUP_ADD _IOW('f', 8,struct ext4_new_group_input)
239 #define EXT4_IOC_GETVERSION_OLD FS_IOC_GETVERSION
240 #define EXT4_IOC_SETVERSION_OLD FS_IOC_SETVERSION
241 #ifdef CONFIG_JBD2_DEBUG
242 #define EXT4_IOC_WAIT_FOR_READONLY _IOR('f', 99, long)
244 #define EXT4_IOC_GETRSVSZ _IOR('f', 5, long)
245 #define EXT4_IOC_SETRSVSZ _IOW('f', 6, long)
246 #define EXT4_IOC_MIGRATE _IO('f', 7)
249 * ioctl commands in 32 bit emulation
251 #define EXT4_IOC32_GETFLAGS FS_IOC32_GETFLAGS
252 #define EXT4_IOC32_SETFLAGS FS_IOC32_SETFLAGS
253 #define EXT4_IOC32_GETVERSION _IOR('f', 3, int)
254 #define EXT4_IOC32_SETVERSION _IOW('f', 4, int)
255 #define EXT4_IOC32_GETRSVSZ _IOR('f', 5, int)
256 #define EXT4_IOC32_SETRSVSZ _IOW('f', 6, int)
257 #define EXT4_IOC32_GROUP_EXTEND _IOW('f', 7, unsigned int)
258 #ifdef CONFIG_JBD2_DEBUG
259 #define EXT4_IOC32_WAIT_FOR_READONLY _IOR('f', 99, int)
261 #define EXT4_IOC32_GETVERSION_OLD FS_IOC32_GETVERSION
262 #define EXT4_IOC32_SETVERSION_OLD FS_IOC32_SETVERSION
268 struct ext4_mount_options {
269 unsigned long s_mount_opt;
272 unsigned long s_commit_interval;
275 char *s_qf_names[MAXQUOTAS];
280 * Structure of an inode on the disk
283 __le16 i_mode; /* File mode */
284 __le16 i_uid; /* Low 16 bits of Owner Uid */
285 __le32 i_size_lo; /* Size in bytes */
286 __le32 i_atime; /* Access time */
287 __le32 i_ctime; /* Inode Change time */
288 __le32 i_mtime; /* Modification time */
289 __le32 i_dtime; /* Deletion Time */
290 __le16 i_gid; /* Low 16 bits of Group Id */
291 __le16 i_links_count; /* Links count */
292 __le32 i_blocks_lo; /* Blocks count */
293 __le32 i_flags; /* File flags */
299 __u32 h_i_translator;
304 } osd1; /* OS dependent 1 */
305 __le32 i_block[EXT4_N_BLOCKS];/* Pointers to blocks */
306 __le32 i_generation; /* File version (for NFS) */
307 __le32 i_file_acl_lo; /* File ACL */
309 __le32 i_obso_faddr; /* Obsoleted fragment address */
312 __le16 l_i_blocks_high; /* were l_i_reserved1 */
313 __le16 l_i_file_acl_high;
314 __le16 l_i_uid_high; /* these 2 fields */
315 __le16 l_i_gid_high; /* were reserved2[0] */
319 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
326 __le16 h_i_reserved1; /* Obsoleted fragment number/size which are removed in ext4 */
327 __le16 m_i_file_acl_high;
328 __u32 m_i_reserved2[2];
330 } osd2; /* OS dependent 2 */
331 __le16 i_extra_isize;
333 __le32 i_ctime_extra; /* extra Change time (nsec << 2 | epoch) */
334 __le32 i_mtime_extra; /* extra Modification time(nsec << 2 | epoch) */
335 __le32 i_atime_extra; /* extra Access time (nsec << 2 | epoch) */
336 __le32 i_crtime; /* File Creation time */
337 __le32 i_crtime_extra; /* extra FileCreationtime (nsec << 2 | epoch) */
338 __le32 i_version_hi; /* high 32 bits for 64-bit version */
342 #define EXT4_EPOCH_BITS 2
343 #define EXT4_EPOCH_MASK ((1 << EXT4_EPOCH_BITS) - 1)
344 #define EXT4_NSEC_MASK (~0UL << EXT4_EPOCH_BITS)
347 * Extended fields will fit into an inode if the filesystem was formatted
348 * with large inodes (-I 256 or larger) and there are not currently any EAs
349 * consuming all of the available space. For new inodes we always reserve
350 * enough space for the kernel's known extended fields, but for inodes
351 * created with an old kernel this might not have been the case. None of
352 * the extended inode fields is critical for correct filesystem operation.
353 * This macro checks if a certain field fits in the inode. Note that
354 * inode-size = GOOD_OLD_INODE_SIZE + i_extra_isize
356 #define EXT4_FITS_IN_INODE(ext4_inode, einode, field) \
357 ((offsetof(typeof(*ext4_inode), field) + \
358 sizeof((ext4_inode)->field)) \
359 <= (EXT4_GOOD_OLD_INODE_SIZE + \
360 (einode)->i_extra_isize)) \
362 static inline __le32 ext4_encode_extra_time(struct timespec *time)
364 return cpu_to_le32((sizeof(time->tv_sec) > 4 ?
365 time->tv_sec >> 32 : 0) |
366 ((time->tv_nsec << 2) & EXT4_NSEC_MASK));
369 static inline void ext4_decode_extra_time(struct timespec *time, __le32 extra)
371 if (sizeof(time->tv_sec) > 4)
372 time->tv_sec |= (__u64)(le32_to_cpu(extra) & EXT4_EPOCH_MASK)
374 time->tv_nsec = (le32_to_cpu(extra) & EXT4_NSEC_MASK) >> 2;
377 #define EXT4_INODE_SET_XTIME(xtime, inode, raw_inode) \
379 (raw_inode)->xtime = cpu_to_le32((inode)->xtime.tv_sec); \
380 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
381 (raw_inode)->xtime ## _extra = \
382 ext4_encode_extra_time(&(inode)->xtime); \
385 #define EXT4_EINODE_SET_XTIME(xtime, einode, raw_inode) \
387 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
388 (raw_inode)->xtime = cpu_to_le32((einode)->xtime.tv_sec); \
389 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
390 (raw_inode)->xtime ## _extra = \
391 ext4_encode_extra_time(&(einode)->xtime); \
394 #define EXT4_INODE_GET_XTIME(xtime, inode, raw_inode) \
396 (inode)->xtime.tv_sec = (signed)le32_to_cpu((raw_inode)->xtime); \
397 if (EXT4_FITS_IN_INODE(raw_inode, EXT4_I(inode), xtime ## _extra)) \
398 ext4_decode_extra_time(&(inode)->xtime, \
399 raw_inode->xtime ## _extra); \
402 #define EXT4_EINODE_GET_XTIME(xtime, einode, raw_inode) \
404 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime)) \
405 (einode)->xtime.tv_sec = \
406 (signed)le32_to_cpu((raw_inode)->xtime); \
407 if (EXT4_FITS_IN_INODE(raw_inode, einode, xtime ## _extra)) \
408 ext4_decode_extra_time(&(einode)->xtime, \
409 raw_inode->xtime ## _extra); \
412 #define i_disk_version osd1.linux1.l_i_version
414 #if defined(__KERNEL__) || defined(__linux__)
415 #define i_reserved1 osd1.linux1.l_i_reserved1
416 #define i_file_acl_high osd2.linux2.l_i_file_acl_high
417 #define i_blocks_high osd2.linux2.l_i_blocks_high
418 #define i_uid_low i_uid
419 #define i_gid_low i_gid
420 #define i_uid_high osd2.linux2.l_i_uid_high
421 #define i_gid_high osd2.linux2.l_i_gid_high
422 #define i_reserved2 osd2.linux2.l_i_reserved2
424 #elif defined(__GNU__)
426 #define i_translator osd1.hurd1.h_i_translator
427 #define i_uid_high osd2.hurd2.h_i_uid_high
428 #define i_gid_high osd2.hurd2.h_i_gid_high
429 #define i_author osd2.hurd2.h_i_author
431 #elif defined(__masix__)
433 #define i_reserved1 osd1.masix1.m_i_reserved1
434 #define i_file_acl_high osd2.masix2.m_i_file_acl_high
435 #define i_reserved2 osd2.masix2.m_i_reserved2
437 #endif /* defined(__KERNEL__) || defined(__linux__) */
442 #define EXT4_VALID_FS 0x0001 /* Unmounted cleanly */
443 #define EXT4_ERROR_FS 0x0002 /* Errors detected */
444 #define EXT4_ORPHAN_FS 0x0004 /* Orphans being recovered */
449 #define EXT4_MOUNT_CHECK 0x00001 /* Do mount-time checks */
450 #define EXT4_MOUNT_OLDALLOC 0x00002 /* Don't use the new Orlov allocator */
451 #define EXT4_MOUNT_GRPID 0x00004 /* Create files with directory's group */
452 #define EXT4_MOUNT_DEBUG 0x00008 /* Some debugging messages */
453 #define EXT4_MOUNT_ERRORS_CONT 0x00010 /* Continue on errors */
454 #define EXT4_MOUNT_ERRORS_RO 0x00020 /* Remount fs ro on errors */
455 #define EXT4_MOUNT_ERRORS_PANIC 0x00040 /* Panic on errors */
456 #define EXT4_MOUNT_MINIX_DF 0x00080 /* Mimics the Minix statfs */
457 #define EXT4_MOUNT_NOLOAD 0x00100 /* Don't use existing journal*/
458 #define EXT4_MOUNT_ABORT 0x00200 /* Fatal error detected */
459 #define EXT4_MOUNT_DATA_FLAGS 0x00C00 /* Mode for data writes: */
460 #define EXT4_MOUNT_JOURNAL_DATA 0x00400 /* Write data to journal */
461 #define EXT4_MOUNT_ORDERED_DATA 0x00800 /* Flush data before commit */
462 #define EXT4_MOUNT_WRITEBACK_DATA 0x00C00 /* No data ordering */
463 #define EXT4_MOUNT_UPDATE_JOURNAL 0x01000 /* Update the journal format */
464 #define EXT4_MOUNT_NO_UID32 0x02000 /* Disable 32-bit UIDs */
465 #define EXT4_MOUNT_XATTR_USER 0x04000 /* Extended user attributes */
466 #define EXT4_MOUNT_POSIX_ACL 0x08000 /* POSIX Access Control Lists */
467 #define EXT4_MOUNT_RESERVATION 0x10000 /* Preallocation */
468 #define EXT4_MOUNT_BARRIER 0x20000 /* Use block barriers */
469 #define EXT4_MOUNT_NOBH 0x40000 /* No bufferheads */
470 #define EXT4_MOUNT_QUOTA 0x80000 /* Some quota option set */
471 #define EXT4_MOUNT_USRQUOTA 0x100000 /* "old" user quota */
472 #define EXT4_MOUNT_GRPQUOTA 0x200000 /* "old" group quota */
473 #define EXT4_MOUNT_EXTENTS 0x400000 /* Extents support */
474 #define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
475 #define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
476 #define EXT4_MOUNT_I_VERSION 0x2000000 /* i_version support */
477 /* Compatibility, for having both ext2_fs.h and ext4_fs.h included at once */
478 #ifndef _LINUX_EXT2_FS_H
479 #define clear_opt(o, opt) o &= ~EXT4_MOUNT_##opt
480 #define set_opt(o, opt) o |= EXT4_MOUNT_##opt
481 #define test_opt(sb, opt) (EXT4_SB(sb)->s_mount_opt & \
484 #define EXT2_MOUNT_NOLOAD EXT4_MOUNT_NOLOAD
485 #define EXT2_MOUNT_ABORT EXT4_MOUNT_ABORT
486 #define EXT2_MOUNT_DATA_FLAGS EXT4_MOUNT_DATA_FLAGS
489 #define ext4_set_bit ext2_set_bit
490 #define ext4_set_bit_atomic ext2_set_bit_atomic
491 #define ext4_clear_bit ext2_clear_bit
492 #define ext4_clear_bit_atomic ext2_clear_bit_atomic
493 #define ext4_test_bit ext2_test_bit
494 #define ext4_find_first_zero_bit ext2_find_first_zero_bit
495 #define ext4_find_next_zero_bit ext2_find_next_zero_bit
498 * Maximal mount counts between two filesystem checks
500 #define EXT4_DFL_MAX_MNT_COUNT 20 /* Allow 20 mounts */
501 #define EXT4_DFL_CHECKINTERVAL 0 /* Don't use interval check */
504 * Behaviour when detecting errors
506 #define EXT4_ERRORS_CONTINUE 1 /* Continue execution */
507 #define EXT4_ERRORS_RO 2 /* Remount fs read-only */
508 #define EXT4_ERRORS_PANIC 3 /* Panic */
509 #define EXT4_ERRORS_DEFAULT EXT4_ERRORS_CONTINUE
512 * Structure of the super block
514 struct ext4_super_block {
515 /*00*/ __le32 s_inodes_count; /* Inodes count */
516 __le32 s_blocks_count_lo; /* Blocks count */
517 __le32 s_r_blocks_count_lo; /* Reserved blocks count */
518 __le32 s_free_blocks_count_lo; /* Free blocks count */
519 /*10*/ __le32 s_free_inodes_count; /* Free inodes count */
520 __le32 s_first_data_block; /* First Data Block */
521 __le32 s_log_block_size; /* Block size */
522 __le32 s_obso_log_frag_size; /* Obsoleted fragment size */
523 /*20*/ __le32 s_blocks_per_group; /* # Blocks per group */
524 __le32 s_obso_frags_per_group; /* Obsoleted fragments per group */
525 __le32 s_inodes_per_group; /* # Inodes per group */
526 __le32 s_mtime; /* Mount time */
527 /*30*/ __le32 s_wtime; /* Write time */
528 __le16 s_mnt_count; /* Mount count */
529 __le16 s_max_mnt_count; /* Maximal mount count */
530 __le16 s_magic; /* Magic signature */
531 __le16 s_state; /* File system state */
532 __le16 s_errors; /* Behaviour when detecting errors */
533 __le16 s_minor_rev_level; /* minor revision level */
534 /*40*/ __le32 s_lastcheck; /* time of last check */
535 __le32 s_checkinterval; /* max. time between checks */
536 __le32 s_creator_os; /* OS */
537 __le32 s_rev_level; /* Revision level */
538 /*50*/ __le16 s_def_resuid; /* Default uid for reserved blocks */
539 __le16 s_def_resgid; /* Default gid for reserved blocks */
541 * These fields are for EXT4_DYNAMIC_REV superblocks only.
543 * Note: the difference between the compatible feature set and
544 * the incompatible feature set is that if there is a bit set
545 * in the incompatible feature set that the kernel doesn't
546 * know about, it should refuse to mount the filesystem.
548 * e2fsck's requirements are more strict; if it doesn't know
549 * about a feature in either the compatible or incompatible
550 * feature set, it must abort and not try to meddle with
551 * things it doesn't understand...
553 __le32 s_first_ino; /* First non-reserved inode */
554 __le16 s_inode_size; /* size of inode structure */
555 __le16 s_block_group_nr; /* block group # of this superblock */
556 __le32 s_feature_compat; /* compatible feature set */
557 /*60*/ __le32 s_feature_incompat; /* incompatible feature set */
558 __le32 s_feature_ro_compat; /* readonly-compatible feature set */
559 /*68*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
560 /*78*/ char s_volume_name[16]; /* volume name */
561 /*88*/ char s_last_mounted[64]; /* directory where last mounted */
562 /*C8*/ __le32 s_algorithm_usage_bitmap; /* For compression */
564 * Performance hints. Directory preallocation should only
565 * happen if the EXT4_FEATURE_COMPAT_DIR_PREALLOC flag is on.
567 __u8 s_prealloc_blocks; /* Nr of blocks to try to preallocate*/
568 __u8 s_prealloc_dir_blocks; /* Nr to preallocate for dirs */
569 __le16 s_reserved_gdt_blocks; /* Per group desc for online growth */
571 * Journaling support valid if EXT4_FEATURE_COMPAT_HAS_JOURNAL set.
573 /*D0*/ __u8 s_journal_uuid[16]; /* uuid of journal superblock */
574 /*E0*/ __le32 s_journal_inum; /* inode number of journal file */
575 __le32 s_journal_dev; /* device number of journal file */
576 __le32 s_last_orphan; /* start of list of inodes to delete */
577 __le32 s_hash_seed[4]; /* HTREE hash seed */
578 __u8 s_def_hash_version; /* Default hash version to use */
579 __u8 s_reserved_char_pad;
580 __le16 s_desc_size; /* size of group descriptor */
581 /*100*/ __le32 s_default_mount_opts;
582 __le32 s_first_meta_bg; /* First metablock block group */
583 __le32 s_mkfs_time; /* When the filesystem was created */
584 __le32 s_jnl_blocks[17]; /* Backup of the journal inode */
585 /* 64bit support valid if EXT4_FEATURE_COMPAT_64BIT */
586 /*150*/ __le32 s_blocks_count_hi; /* Blocks count */
587 __le32 s_r_blocks_count_hi; /* Reserved blocks count */
588 __le32 s_free_blocks_count_hi; /* Free blocks count */
589 __le16 s_min_extra_isize; /* All inodes have at least # bytes */
590 __le16 s_want_extra_isize; /* New inodes should reserve # bytes */
591 __le32 s_flags; /* Miscellaneous flags */
592 __le16 s_raid_stride; /* RAID stride */
593 __le16 s_mmp_interval; /* # seconds to wait in MMP checking */
594 __le64 s_mmp_block; /* Block for multi-mount protection */
595 __le32 s_raid_stripe_width; /* blocks on all data disks (N*stride)*/
596 __u32 s_reserved[163]; /* Padding to the end of the block */
600 static inline struct ext4_sb_info * EXT4_SB(struct super_block *sb)
602 return sb->s_fs_info;
604 static inline struct ext4_inode_info *EXT4_I(struct inode *inode)
606 return container_of(inode, struct ext4_inode_info, vfs_inode);
609 static inline struct timespec ext4_current_time(struct inode *inode)
611 return (inode->i_sb->s_time_gran < NSEC_PER_SEC) ?
612 current_fs_time(inode->i_sb) : CURRENT_TIME_SEC;
616 static inline int ext4_valid_inum(struct super_block *sb, unsigned long ino)
618 return ino == EXT4_ROOT_INO ||
619 ino == EXT4_JOURNAL_INO ||
620 ino == EXT4_RESIZE_INO ||
621 (ino >= EXT4_FIRST_INO(sb) &&
622 ino <= le32_to_cpu(EXT4_SB(sb)->s_es->s_inodes_count));
625 /* Assume that user mode programs are passing in an ext4fs superblock, not
626 * a kernel struct super_block. This will allow us to call the feature-test
627 * macros from user land. */
628 #define EXT4_SB(sb) (sb)
631 #define NEXT_ORPHAN(inode) EXT4_I(inode)->i_dtime
634 * Codes for operating systems
636 #define EXT4_OS_LINUX 0
637 #define EXT4_OS_HURD 1
638 #define EXT4_OS_MASIX 2
639 #define EXT4_OS_FREEBSD 3
640 #define EXT4_OS_LITES 4
645 #define EXT4_GOOD_OLD_REV 0 /* The good old (original) format */
646 #define EXT4_DYNAMIC_REV 1 /* V2 format w/ dynamic inode sizes */
648 #define EXT4_CURRENT_REV EXT4_GOOD_OLD_REV
649 #define EXT4_MAX_SUPP_REV EXT4_DYNAMIC_REV
651 #define EXT4_GOOD_OLD_INODE_SIZE 128
654 * Feature set definitions
657 #define EXT4_HAS_COMPAT_FEATURE(sb,mask) \
658 ( EXT4_SB(sb)->s_es->s_feature_compat & cpu_to_le32(mask) )
659 #define EXT4_HAS_RO_COMPAT_FEATURE(sb,mask) \
660 ( EXT4_SB(sb)->s_es->s_feature_ro_compat & cpu_to_le32(mask) )
661 #define EXT4_HAS_INCOMPAT_FEATURE(sb,mask) \
662 ( EXT4_SB(sb)->s_es->s_feature_incompat & cpu_to_le32(mask) )
663 #define EXT4_SET_COMPAT_FEATURE(sb,mask) \
664 EXT4_SB(sb)->s_es->s_feature_compat |= cpu_to_le32(mask)
665 #define EXT4_SET_RO_COMPAT_FEATURE(sb,mask) \
666 EXT4_SB(sb)->s_es->s_feature_ro_compat |= cpu_to_le32(mask)
667 #define EXT4_SET_INCOMPAT_FEATURE(sb,mask) \
668 EXT4_SB(sb)->s_es->s_feature_incompat |= cpu_to_le32(mask)
669 #define EXT4_CLEAR_COMPAT_FEATURE(sb,mask) \
670 EXT4_SB(sb)->s_es->s_feature_compat &= ~cpu_to_le32(mask)
671 #define EXT4_CLEAR_RO_COMPAT_FEATURE(sb,mask) \
672 EXT4_SB(sb)->s_es->s_feature_ro_compat &= ~cpu_to_le32(mask)
673 #define EXT4_CLEAR_INCOMPAT_FEATURE(sb,mask) \
674 EXT4_SB(sb)->s_es->s_feature_incompat &= ~cpu_to_le32(mask)
676 #define EXT4_FEATURE_COMPAT_DIR_PREALLOC 0x0001
677 #define EXT4_FEATURE_COMPAT_IMAGIC_INODES 0x0002
678 #define EXT4_FEATURE_COMPAT_HAS_JOURNAL 0x0004
679 #define EXT4_FEATURE_COMPAT_EXT_ATTR 0x0008
680 #define EXT4_FEATURE_COMPAT_RESIZE_INODE 0x0010
681 #define EXT4_FEATURE_COMPAT_DIR_INDEX 0x0020
683 #define EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER 0x0001
684 #define EXT4_FEATURE_RO_COMPAT_LARGE_FILE 0x0002
685 #define EXT4_FEATURE_RO_COMPAT_BTREE_DIR 0x0004
686 #define EXT4_FEATURE_RO_COMPAT_HUGE_FILE 0x0008
687 #define EXT4_FEATURE_RO_COMPAT_GDT_CSUM 0x0010
688 #define EXT4_FEATURE_RO_COMPAT_DIR_NLINK 0x0020
689 #define EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE 0x0040
691 #define EXT4_FEATURE_INCOMPAT_COMPRESSION 0x0001
692 #define EXT4_FEATURE_INCOMPAT_FILETYPE 0x0002
693 #define EXT4_FEATURE_INCOMPAT_RECOVER 0x0004 /* Needs recovery */
694 #define EXT4_FEATURE_INCOMPAT_JOURNAL_DEV 0x0008 /* Journal device */
695 #define EXT4_FEATURE_INCOMPAT_META_BG 0x0010
696 #define EXT4_FEATURE_INCOMPAT_EXTENTS 0x0040 /* extents support */
697 #define EXT4_FEATURE_INCOMPAT_64BIT 0x0080
698 #define EXT4_FEATURE_INCOMPAT_MMP 0x0100
699 #define EXT4_FEATURE_INCOMPAT_FLEX_BG 0x0200
701 #define EXT4_FEATURE_COMPAT_SUPP EXT2_FEATURE_COMPAT_EXT_ATTR
702 #define EXT4_FEATURE_INCOMPAT_SUPP (EXT4_FEATURE_INCOMPAT_FILETYPE| \
703 EXT4_FEATURE_INCOMPAT_RECOVER| \
704 EXT4_FEATURE_INCOMPAT_META_BG| \
705 EXT4_FEATURE_INCOMPAT_EXTENTS| \
706 EXT4_FEATURE_INCOMPAT_64BIT| \
707 EXT4_FEATURE_INCOMPAT_FLEX_BG)
708 #define EXT4_FEATURE_RO_COMPAT_SUPP (EXT4_FEATURE_RO_COMPAT_SPARSE_SUPER| \
709 EXT4_FEATURE_RO_COMPAT_LARGE_FILE| \
710 EXT4_FEATURE_RO_COMPAT_GDT_CSUM| \
711 EXT4_FEATURE_RO_COMPAT_DIR_NLINK | \
712 EXT4_FEATURE_RO_COMPAT_EXTRA_ISIZE | \
713 EXT4_FEATURE_RO_COMPAT_BTREE_DIR |\
714 EXT4_FEATURE_RO_COMPAT_HUGE_FILE)
717 * Default values for user and/or group using reserved blocks
719 #define EXT4_DEF_RESUID 0
720 #define EXT4_DEF_RESGID 0
723 * Default mount options
725 #define EXT4_DEFM_DEBUG 0x0001
726 #define EXT4_DEFM_BSDGROUPS 0x0002
727 #define EXT4_DEFM_XATTR_USER 0x0004
728 #define EXT4_DEFM_ACL 0x0008
729 #define EXT4_DEFM_UID16 0x0010
730 #define EXT4_DEFM_JMODE 0x0060
731 #define EXT4_DEFM_JMODE_DATA 0x0020
732 #define EXT4_DEFM_JMODE_ORDERED 0x0040
733 #define EXT4_DEFM_JMODE_WBACK 0x0060
736 * Structure of a directory entry
738 #define EXT4_NAME_LEN 255
740 struct ext4_dir_entry {
741 __le32 inode; /* Inode number */
742 __le16 rec_len; /* Directory entry length */
743 __le16 name_len; /* Name length */
744 char name[EXT4_NAME_LEN]; /* File name */
748 * The new version of the directory entry. Since EXT4 structures are
749 * stored in intel byte order, and the name_len field could never be
750 * bigger than 255 chars, it's safe to reclaim the extra byte for the
753 struct ext4_dir_entry_2 {
754 __le32 inode; /* Inode number */
755 __le16 rec_len; /* Directory entry length */
756 __u8 name_len; /* Name length */
758 char name[EXT4_NAME_LEN]; /* File name */
762 * Ext4 directory file types. Only the low 3 bits are used. The
763 * other bits are reserved for now.
765 #define EXT4_FT_UNKNOWN 0
766 #define EXT4_FT_REG_FILE 1
767 #define EXT4_FT_DIR 2
768 #define EXT4_FT_CHRDEV 3
769 #define EXT4_FT_BLKDEV 4
770 #define EXT4_FT_FIFO 5
771 #define EXT4_FT_SOCK 6
772 #define EXT4_FT_SYMLINK 7
774 #define EXT4_FT_MAX 8
777 * EXT4_DIR_PAD defines the directory entries boundaries
779 * NOTE: It must be a multiple of 4
781 #define EXT4_DIR_PAD 4
782 #define EXT4_DIR_ROUND (EXT4_DIR_PAD - 1)
783 #define EXT4_DIR_REC_LEN(name_len) (((name_len) + 8 + EXT4_DIR_ROUND) & \
785 #define EXT4_MAX_REC_LEN ((1<<16)-1)
787 static inline unsigned ext4_rec_len_from_disk(__le16 dlen)
789 unsigned len = le16_to_cpu(dlen);
791 if (len == EXT4_MAX_REC_LEN)
796 static inline __le16 ext4_rec_len_to_disk(unsigned len)
798 if (len == (1 << 16))
799 return cpu_to_le16(EXT4_MAX_REC_LEN);
800 else if (len > (1 << 16))
802 return cpu_to_le16(len);
806 * Hash Tree Directory indexing
807 * (c) Daniel Phillips, 2001
810 #define is_dx(dir) (EXT4_HAS_COMPAT_FEATURE(dir->i_sb, \
811 EXT4_FEATURE_COMPAT_DIR_INDEX) && \
812 (EXT4_I(dir)->i_flags & EXT4_INDEX_FL))
813 #define EXT4_DIR_LINK_MAX(dir) (!is_dx(dir) && (dir)->i_nlink >= EXT4_LINK_MAX)
814 #define EXT4_DIR_LINK_EMPTY(dir) ((dir)->i_nlink == 2 || (dir)->i_nlink == 1)
816 /* Legal values for the dx_root hash_version field: */
818 #define DX_HASH_LEGACY 0
819 #define DX_HASH_HALF_MD4 1
820 #define DX_HASH_TEA 2
824 /* hash info structure used by the directory hash */
833 #define EXT4_HTREE_EOF 0x7fffffff
836 * Control parameters used by ext4_htree_next_block
838 #define HASH_NB_ALWAYS 1
842 * Describe an inode's exact location on disk and in memory
846 struct buffer_head *bh;
847 unsigned long offset;
848 ext4_group_t block_group;
851 static inline struct ext4_inode *ext4_raw_inode(struct ext4_iloc *iloc)
853 return (struct ext4_inode *) (iloc->bh->b_data + iloc->offset);
857 * This structure is stuffed into the struct file's private_data field
858 * for directories. It is where we put information so that we can do
859 * readdir operations in hash tree order.
861 struct dir_private_info {
863 struct rb_node *curr_node;
864 struct fname *extra_fname;
867 __u32 curr_minor_hash;
871 /* calculate the first block number of the group */
872 static inline ext4_fsblk_t
873 ext4_group_first_block_no(struct super_block *sb, ext4_group_t group_no)
875 return group_no * (ext4_fsblk_t)EXT4_BLOCKS_PER_GROUP(sb) +
876 le32_to_cpu(EXT4_SB(sb)->s_es->s_first_data_block);
880 * Special error return code only used by dx_probe() and its callers.
882 #define ERR_BAD_DX_DIR -75000
884 void ext4_get_group_no_and_offset(struct super_block *sb, ext4_fsblk_t blocknr,
885 unsigned long *blockgrpp, ext4_grpblk_t *offsetp);
888 * Function prototypes
892 * Ok, these declarations are also in <linux/kernel.h> but none of the
893 * ext4 source programs needs to include it so they are duplicated here.
895 # define NORET_TYPE /**/
896 # define ATTRIB_NORET __attribute__((noreturn))
897 # define NORET_AND noreturn,
900 extern unsigned int ext4_block_group(struct super_block *sb,
901 ext4_fsblk_t blocknr);
902 extern ext4_grpblk_t ext4_block_group_offset(struct super_block *sb,
903 ext4_fsblk_t blocknr);
904 extern int ext4_bg_has_super(struct super_block *sb, ext4_group_t group);
905 extern unsigned long ext4_bg_num_gdb(struct super_block *sb,
907 extern ext4_fsblk_t ext4_new_block (handle_t *handle, struct inode *inode,
908 ext4_fsblk_t goal, int *errp);
909 extern ext4_fsblk_t ext4_new_blocks (handle_t *handle, struct inode *inode,
910 ext4_fsblk_t goal, unsigned long *count, int *errp);
911 extern ext4_fsblk_t ext4_new_blocks_old(handle_t *handle, struct inode *inode,
912 ext4_fsblk_t goal, unsigned long *count, int *errp);
913 extern void ext4_free_blocks (handle_t *handle, struct inode *inode,
914 ext4_fsblk_t block, unsigned long count);
915 extern void ext4_free_blocks_sb (handle_t *handle, struct super_block *sb,
916 ext4_fsblk_t block, unsigned long count,
917 unsigned long *pdquot_freed_blocks);
918 extern ext4_fsblk_t ext4_count_free_blocks (struct super_block *);
919 extern void ext4_check_blocks_bitmap (struct super_block *);
920 extern struct ext4_group_desc * ext4_get_group_desc(struct super_block * sb,
921 ext4_group_t block_group,
922 struct buffer_head ** bh);
923 extern int ext4_should_retry_alloc(struct super_block *sb, int *retries);
924 extern void ext4_init_block_alloc_info(struct inode *);
925 extern void ext4_rsv_window_add(struct super_block *sb, struct ext4_reserve_window_node *rsv);
928 extern int ext4_check_dir_entry(const char *, struct inode *,
929 struct ext4_dir_entry_2 *,
930 struct buffer_head *, unsigned long);
931 extern int ext4_htree_store_dirent(struct file *dir_file, __u32 hash,
933 struct ext4_dir_entry_2 *dirent);
934 extern void ext4_htree_free_dir_info(struct dir_private_info *p);
937 extern int ext4_sync_file (struct file *, struct dentry *, int);
940 extern int ext4fs_dirhash(const char *name, int len, struct
941 dx_hash_info *hinfo);
944 extern struct inode * ext4_new_inode (handle_t *, struct inode *, int);
945 extern void ext4_free_inode (handle_t *, struct inode *);
946 extern struct inode * ext4_orphan_get (struct super_block *, unsigned long);
947 extern unsigned long ext4_count_free_inodes (struct super_block *);
948 extern unsigned long ext4_count_dirs (struct super_block *);
949 extern void ext4_check_inodes_bitmap (struct super_block *);
950 extern unsigned long ext4_count_free (struct buffer_head *, unsigned);
954 int ext4_forget(handle_t *handle, int is_metadata, struct inode *inode,
955 struct buffer_head *bh, ext4_fsblk_t blocknr);
956 struct buffer_head *ext4_getblk(handle_t *, struct inode *,
957 ext4_lblk_t, int, int *);
958 struct buffer_head *ext4_bread(handle_t *, struct inode *,
959 ext4_lblk_t, int, int *);
960 int ext4_get_blocks_handle(handle_t *handle, struct inode *inode,
961 ext4_lblk_t iblock, unsigned long maxblocks,
962 struct buffer_head *bh_result,
963 int create, int extend_disksize);
965 extern void ext4_read_inode (struct inode *);
966 extern int ext4_write_inode (struct inode *, int);
967 extern int ext4_setattr (struct dentry *, struct iattr *);
968 extern void ext4_delete_inode (struct inode *);
969 extern int ext4_sync_inode (handle_t *, struct inode *);
970 extern void ext4_discard_reservation (struct inode *);
971 extern void ext4_dirty_inode(struct inode *);
972 extern int ext4_change_inode_journal_flag(struct inode *, int);
973 extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *);
974 extern void ext4_truncate (struct inode *);
975 extern void ext4_set_inode_flags(struct inode *);
976 extern void ext4_get_inode_flags(struct ext4_inode_info *);
977 extern void ext4_set_aops(struct inode *inode);
978 extern int ext4_writepage_trans_blocks(struct inode *);
979 extern int ext4_block_truncate_page(handle_t *handle, struct page *page,
980 struct address_space *mapping, loff_t from);
983 extern int ext4_ioctl (struct inode *, struct file *, unsigned int,
985 extern long ext4_compat_ioctl (struct file *, unsigned int, unsigned long);
988 extern int ext4_ext_migrate(struct inode *, struct file *, unsigned int,
991 extern int ext4_orphan_add(handle_t *, struct inode *);
992 extern int ext4_orphan_del(handle_t *, struct inode *);
993 extern int ext4_htree_fill_tree(struct file *dir_file, __u32 start_hash,
994 __u32 start_minor_hash, __u32 *next_hash);
997 extern int ext4_group_add(struct super_block *sb,
998 struct ext4_new_group_data *input);
999 extern int ext4_group_extend(struct super_block *sb,
1000 struct ext4_super_block *es,
1001 ext4_fsblk_t n_blocks_count);
1004 extern void ext4_error (struct super_block *, const char *, const char *, ...)
1005 __attribute__ ((format (printf, 3, 4)));
1006 extern void __ext4_std_error (struct super_block *, const char *, int);
1007 extern void ext4_abort (struct super_block *, const char *, const char *, ...)
1008 __attribute__ ((format (printf, 3, 4)));
1009 extern void ext4_warning (struct super_block *, const char *, const char *, ...)
1010 __attribute__ ((format (printf, 3, 4)));
1011 extern void ext4_update_dynamic_rev (struct super_block *sb);
1012 extern int ext4_update_compat_feature(handle_t *handle, struct super_block *sb,
1014 extern int ext4_update_rocompat_feature(handle_t *handle,
1015 struct super_block *sb, __u32 rocompat);
1016 extern int ext4_update_incompat_feature(handle_t *handle,
1017 struct super_block *sb, __u32 incompat);
1018 extern ext4_fsblk_t ext4_block_bitmap(struct super_block *sb,
1019 struct ext4_group_desc *bg);
1020 extern ext4_fsblk_t ext4_inode_bitmap(struct super_block *sb,
1021 struct ext4_group_desc *bg);
1022 extern ext4_fsblk_t ext4_inode_table(struct super_block *sb,
1023 struct ext4_group_desc *bg);
1024 extern void ext4_block_bitmap_set(struct super_block *sb,
1025 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1026 extern void ext4_inode_bitmap_set(struct super_block *sb,
1027 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1028 extern void ext4_inode_table_set(struct super_block *sb,
1029 struct ext4_group_desc *bg, ext4_fsblk_t blk);
1031 static inline ext4_fsblk_t ext4_blocks_count(struct ext4_super_block *es)
1033 return ((ext4_fsblk_t)le32_to_cpu(es->s_blocks_count_hi) << 32) |
1034 le32_to_cpu(es->s_blocks_count_lo);
1037 static inline ext4_fsblk_t ext4_r_blocks_count(struct ext4_super_block *es)
1039 return ((ext4_fsblk_t)le32_to_cpu(es->s_r_blocks_count_hi) << 32) |
1040 le32_to_cpu(es->s_r_blocks_count_lo);
1043 static inline ext4_fsblk_t ext4_free_blocks_count(struct ext4_super_block *es)
1045 return ((ext4_fsblk_t)le32_to_cpu(es->s_free_blocks_count_hi) << 32) |
1046 le32_to_cpu(es->s_free_blocks_count_lo);
1049 static inline void ext4_blocks_count_set(struct ext4_super_block *es,
1052 es->s_blocks_count_lo = cpu_to_le32((u32)blk);
1053 es->s_blocks_count_hi = cpu_to_le32(blk >> 32);
1056 static inline void ext4_free_blocks_count_set(struct ext4_super_block *es,
1059 es->s_free_blocks_count_lo = cpu_to_le32((u32)blk);
1060 es->s_free_blocks_count_hi = cpu_to_le32(blk >> 32);
1063 static inline void ext4_r_blocks_count_set(struct ext4_super_block *es,
1066 es->s_r_blocks_count_lo = cpu_to_le32((u32)blk);
1067 es->s_r_blocks_count_hi = cpu_to_le32(blk >> 32);
1070 static inline loff_t ext4_isize(struct ext4_inode *raw_inode)
1072 return ((loff_t)le32_to_cpu(raw_inode->i_size_high) << 32) |
1073 le32_to_cpu(raw_inode->i_size_lo);
1076 static inline void ext4_isize_set(struct ext4_inode *raw_inode, loff_t i_size)
1078 raw_inode->i_size_lo = cpu_to_le32(i_size);
1079 raw_inode->i_size_high = cpu_to_le32(i_size >> 32);
1082 #define ext4_std_error(sb, errno) \
1085 __ext4_std_error((sb), __FUNCTION__, (errno)); \
1089 * Inodes and files operations
1093 extern const struct file_operations ext4_dir_operations;
1096 extern const struct inode_operations ext4_file_inode_operations;
1097 extern const struct file_operations ext4_file_operations;
1100 extern const struct inode_operations ext4_dir_inode_operations;
1101 extern const struct inode_operations ext4_special_inode_operations;
1104 extern const struct inode_operations ext4_symlink_inode_operations;
1105 extern const struct inode_operations ext4_fast_symlink_inode_operations;
1108 extern int ext4_ext_tree_init(handle_t *handle, struct inode *);
1109 extern int ext4_ext_writepage_trans_blocks(struct inode *, int);
1110 extern int ext4_ext_get_blocks(handle_t *handle, struct inode *inode,
1112 unsigned long max_blocks, struct buffer_head *bh_result,
1113 int create, int extend_disksize);
1114 extern void ext4_ext_truncate(struct inode *, struct page *);
1115 extern void ext4_ext_init(struct super_block *);
1116 extern void ext4_ext_release(struct super_block *);
1117 extern long ext4_fallocate(struct inode *inode, int mode, loff_t offset,
1119 extern int ext4_get_blocks_wrap(handle_t *handle, struct inode *inode,
1120 sector_t block, unsigned long max_blocks,
1121 struct buffer_head *bh, int create,
1122 int extend_disksize);
1123 #endif /* __KERNEL__ */
1125 #endif /* _LINUX_EXT4_FS_H */