2 * nilfs2_fs.h - NILFS2 on-disk structures and common declarations.
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU Lesser General Public License as published
8 * by the Free Software Foundation; either version 2.1 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU Lesser General Public License for more details.
16 * You should have received a copy of the GNU Lesser General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 * Written by Koji Sato <koji@osrg.net>
21 * Ryusuke Konishi <ryusuke@osrg.net>
24 * linux/include/linux/ext2_fs.h
26 * Copyright (C) 1992, 1993, 1994, 1995
27 * Remy Card (card@masi.ibp.fr)
28 * Laboratoire MASI - Institut Blaise Pascal
29 * Universite Pierre et Marie Curie (Paris VI)
33 * linux/include/linux/minix_fs.h
35 * Copyright (C) 1991, 1992 Linus Torvalds
38 #ifndef _LINUX_NILFS_FS_H
39 #define _LINUX_NILFS_FS_H
41 #include <linux/types.h>
42 #include <linux/ioctl.h>
45 #define NILFS_INODE_BMAP_SIZE 7
47 * struct nilfs_inode - structure of an inode on disk
48 * @i_blocks: blocks count
49 * @i_size: size in bytes
50 * @i_ctime: creation time (seconds)
51 * @i_mtime: modification time (seconds)
52 * @i_ctime_nsec: creation time (nano seconds)
53 * @i_mtime_nsec: modification time (nano seconds)
57 * @i_links_count: links count
58 * @i_flags: file flags
59 * @i_bmap: block mapping
60 * @i_xattr: extended attributes
61 * @i_generation: file generation (for NFS)
76 __le64 i_bmap[NILFS_INODE_BMAP_SIZE];
77 #define i_device_code i_bmap[0]
84 * struct nilfs_super_root - structure of super root
86 * @sr_bytes: byte count of the structure
87 * @sr_flags: flags (reserved)
88 * @sr_nongc_ctime: write time of the last segment not for cleaner operation
89 * @sr_dat: DAT file inode
90 * @sr_cpfile: checkpoint file inode
91 * @sr_sufile: segment usage file inode
93 struct nilfs_super_root {
97 __le64 sr_nongc_ctime;
98 struct nilfs_inode sr_dat;
99 struct nilfs_inode sr_cpfile;
100 struct nilfs_inode sr_sufile;
103 #define NILFS_SR_MDT_OFFSET(inode_size, i) \
104 ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
106 #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
107 #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
108 #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
109 #define NILFS_SR_BYTES (sizeof(struct nilfs_super_root))
112 * Maximal mount counts
114 #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
117 * File system states (sbp->s_state, nilfs->ns_mount_state)
119 #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
120 #define NILFS_ERROR_FS 0x0002 /* Errors detected */
121 #define NILFS_RESIZE_FS 0x0004 /* Resize required */
124 * Mount flags (sbi->s_mount_opt)
126 #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
127 #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
128 #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
129 #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
130 #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
131 #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
132 semantics also for data */
133 #define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
134 mount-time recovery */
135 #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
139 * struct nilfs_super_block - structure of super block on disk
141 struct nilfs_super_block {
142 /*00*/ __le32 s_rev_level; /* Revision level */
143 __le16 s_minor_rev_level; /* minor revision level */
144 __le16 s_magic; /* Magic signature */
146 __le16 s_bytes; /* Bytes count of CRC calculation
147 for this structure. s_reserved
149 __le16 s_flags; /* flags */
150 __le32 s_crc_seed; /* Seed value of CRC calculation */
151 /*10*/ __le32 s_sum; /* Check sum of super block */
153 __le32 s_log_block_size; /* Block size represented as follows
155 1 << (s_log_block_size + 10) */
156 __le64 s_nsegments; /* Number of segments in filesystem */
157 /*20*/ __le64 s_dev_size; /* block device size in bytes */
158 __le64 s_first_data_block; /* 1st seg disk block number */
159 /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */
160 __le32 s_r_segments_percentage; /* Reserved segments percentage */
162 __le64 s_last_cno; /* Last checkpoint number */
163 /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
164 __le64 s_last_seq; /* seq. number of seg written last */
165 /*50*/ __le64 s_free_blocks_count; /* Free blocks count */
167 __le64 s_ctime; /* Creation time (execution time of
169 /*60*/ __le64 s_mtime; /* Mount time */
170 __le64 s_wtime; /* Write time */
171 /*70*/ __le16 s_mnt_count; /* Mount count */
172 __le16 s_max_mnt_count; /* Maximal mount count */
173 __le16 s_state; /* File system state */
174 __le16 s_errors; /* Behaviour when detecting errors */
175 __le64 s_lastcheck; /* time of last check */
177 /*80*/ __le32 s_checkinterval; /* max. time between checks */
178 __le32 s_creator_os; /* OS */
179 __le16 s_def_resuid; /* Default uid for reserved blocks */
180 __le16 s_def_resgid; /* Default gid for reserved blocks */
181 __le32 s_first_ino; /* First non-reserved inode */
183 /*90*/ __le16 s_inode_size; /* Size of an inode */
184 __le16 s_dat_entry_size; /* Size of a dat entry */
185 __le16 s_checkpoint_size; /* Size of a checkpoint */
186 __le16 s_segment_usage_size; /* Size of a segment usage */
188 /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
189 /*A8*/ char s_volume_name[80]; /* volume name */
191 /*F8*/ __le32 s_c_interval; /* Commit interval of segment */
192 __le32 s_c_block_max; /* Threshold of data amount for
193 the segment construction */
194 /*100*/ __le64 s_feature_compat; /* Compatible feature set */
195 __le64 s_feature_compat_ro; /* Read-only compatible feature set */
196 __le64 s_feature_incompat; /* Incompatible feature set */
197 __u32 s_reserved[186]; /* padding to the end of the block */
201 * Codes for operating systems
203 #define NILFS_OS_LINUX 0
204 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
209 #define NILFS_CURRENT_REV 2 /* current major revision */
210 #define NILFS_MINOR_REV 0 /* minor revision */
211 #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
214 * Feature set definitions
216 * If there is a bit set in the incompatible feature set that the kernel
217 * doesn't know about, it should refuse to mount the filesystem.
219 #define NILFS_FEATURE_COMPAT_SUPP 0ULL
220 #define NILFS_FEATURE_COMPAT_RO_SUPP 0ULL
221 #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
224 * Bytes count of super_block for CRC-calculation
226 #define NILFS_SB_BYTES \
227 ((long)&((struct nilfs_super_block *)0)->s_reserved)
230 * Special inode number
232 #define NILFS_ROOT_INO 2 /* Root file inode */
233 #define NILFS_DAT_INO 3 /* DAT file */
234 #define NILFS_CPFILE_INO 4 /* checkpoint file */
235 #define NILFS_SUFILE_INO 5 /* segment usage file */
236 #define NILFS_IFILE_INO 6 /* ifile */
237 #define NILFS_ATIME_INO 7 /* Atime file (reserved) */
238 #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
239 #define NILFS_SKETCH_INO 10 /* Sketch file */
240 #define NILFS_USER_INO 11 /* Fisrt user's file inode number */
242 #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
243 #define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */
245 #define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in
247 #define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in
249 #define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
253 * We call DAT, cpfile, and sufile root metadata files. Inodes of
254 * these files are written in super root block instead of ifile, and
255 * garbage collector doesn't keep any past versions of these files.
257 #define NILFS_ROOT_METADATA_FILE(ino) \
258 ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
261 * bytes offset of secondary super block
263 #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
266 * Maximal count of links to a file
268 #define NILFS_LINK_MAX 32000
271 * Structure of a directory entry
275 #define NILFS_NAME_LEN 255
278 * Block size limitations
280 #define NILFS_MIN_BLOCK_SIZE 1024
281 #define NILFS_MAX_BLOCK_SIZE 65536
284 * The new version of the directory entry. Since V0 structures are
285 * stored in intel byte order, and the name_len field could never be
286 * bigger than 255 chars, it's safe to reclaim the extra byte for the
289 struct nilfs_dir_entry {
290 __le64 inode; /* Inode number */
291 __le16 rec_len; /* Directory entry length */
292 __u8 name_len; /* Name length */
294 char name[NILFS_NAME_LEN]; /* File name */
299 * NILFS directory file types. Only the low 3 bits are used. The
300 * other bits are reserved for now.
315 * NILFS_DIR_PAD defines the directory entries boundaries
317 * NOTE: It must be a multiple of 8
319 #define NILFS_DIR_PAD 8
320 #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
321 #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
323 #define NILFS_MAX_REC_LEN ((1<<16)-1)
325 static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
327 unsigned len = le16_to_cpu(dlen);
329 if (len == NILFS_MAX_REC_LEN)
334 static inline __le16 nilfs_rec_len_to_disk(unsigned len)
336 if (len == (1 << 16))
337 return cpu_to_le16(NILFS_MAX_REC_LEN);
338 else if (len > (1 << 16))
340 return cpu_to_le16(len);
344 * struct nilfs_finfo - file information
345 * @fi_ino: inode number
346 * @fi_cno: checkpoint number
347 * @fi_nblocks: number of blocks (including intermediate blocks)
348 * @fi_ndatablk: number of file data blocks
355 /* array of virtual block numbers */
359 * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
360 * @bi_vblocknr: virtual block number
361 * @bi_blkoff: block offset
363 struct nilfs_binfo_v {
369 * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
370 * @bi_blkoff: block offset
374 struct nilfs_binfo_dat {
381 * union nilfs_binfo: block information
382 * @bi_v: nilfs_binfo_v structure
383 * @bi_dat: nilfs_binfo_dat structure
386 struct nilfs_binfo_v bi_v;
387 struct nilfs_binfo_dat bi_dat;
391 * struct nilfs_segment_summary - segment summary
392 * @ss_datasum: checksum of data
393 * @ss_sumsum: checksum of segment summary
394 * @ss_magic: magic number
395 * @ss_bytes: size of this structure in bytes
397 * @ss_seq: sequence number
398 * @ss_create: creation timestamp
399 * @ss_next: next segment
400 * @ss_nblocks: number of blocks
401 * @ss_nfinfo: number of finfo structures
402 * @ss_sumbytes: total size of segment summary in bytes
404 * @ss_cno: checkpoint number
406 struct nilfs_segment_summary {
420 /* array of finfo structures */
423 #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
426 * Segment summary flags
428 #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
429 #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
430 #define NILFS_SS_SR 0x0004 /* has super root */
431 #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
432 #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
435 * struct nilfs_btree_node - B-tree node
438 * @bn_nchildren: number of children
441 struct nilfs_btree_node {
449 #define NILFS_BTREE_NODE_ROOT 0x01
452 #define NILFS_BTREE_LEVEL_DATA 0
453 #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
454 #define NILFS_BTREE_LEVEL_MAX 14
457 * struct nilfs_palloc_group_desc - block group descriptor
458 * @pg_nfrees: number of free entries in block group
460 struct nilfs_palloc_group_desc {
465 * struct nilfs_dat_entry - disk address translation entry
466 * @de_blocknr: block number
467 * @de_start: start checkpoint number
468 * @de_end: end checkpoint number
469 * @de_rsv: reserved for future use
471 struct nilfs_dat_entry {
479 * struct nilfs_snapshot_list - snapshot list
480 * @ssl_next: next checkpoint number on snapshot list
481 * @ssl_prev: previous checkpoint number on snapshot list
483 struct nilfs_snapshot_list {
489 * struct nilfs_checkpoint - checkpoint structure
491 * @cp_checkpoints_count: checkpoints count in a block
492 * @cp_snapshot_list: snapshot list
493 * @cp_cno: checkpoint number
494 * @cp_create: creation timestamp
495 * @cp_nblk_inc: number of blocks incremented by this checkpoint
496 * @cp_inodes_count: inodes count
497 * @cp_blocks_count: blocks count
498 * @cp_ifile_inode: inode of ifile
500 struct nilfs_checkpoint {
502 __le32 cp_checkpoints_count;
503 struct nilfs_snapshot_list cp_snapshot_list;
507 __le64 cp_inodes_count;
508 __le64 cp_blocks_count; /* Reserved (might be deleted) */
510 /* Do not change the byte offset of ifile inode.
511 To keep the compatibility of the disk format,
512 additional fields should be added behind cp_ifile_inode. */
513 struct nilfs_inode cp_ifile_inode;
516 /* checkpoint flags */
518 NILFS_CHECKPOINT_SNAPSHOT,
519 NILFS_CHECKPOINT_INVALID,
520 NILFS_CHECKPOINT_SKETCH,
521 NILFS_CHECKPOINT_MINOR,
524 #define NILFS_CHECKPOINT_FNS(flag, name) \
526 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
528 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
529 (1UL << NILFS_CHECKPOINT_##flag)); \
532 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
534 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
535 ~(1UL << NILFS_CHECKPOINT_##flag)); \
538 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
540 return !!(le32_to_cpu(cp->cp_flags) & \
541 (1UL << NILFS_CHECKPOINT_##flag)); \
544 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
545 NILFS_CHECKPOINT_FNS(INVALID, invalid)
546 NILFS_CHECKPOINT_FNS(MINOR, minor)
549 * struct nilfs_cpinfo - checkpoint information
552 * @ci_cno: checkpoint number
553 * @ci_create: creation timestamp
554 * @ci_nblk_inc: number of blocks incremented by this checkpoint
555 * @ci_inodes_count: inodes count
556 * @ci_blocks_count: blocks count
557 * @ci_next: next checkpoint number in snapshot list
559 struct nilfs_cpinfo {
565 __u64 ci_inodes_count;
566 __u64 ci_blocks_count;
570 #define NILFS_CPINFO_FNS(flag, name) \
572 nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
574 return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
577 NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
578 NILFS_CPINFO_FNS(INVALID, invalid)
579 NILFS_CPINFO_FNS(MINOR, minor)
583 * struct nilfs_cpfile_header - checkpoint file header
584 * @ch_ncheckpoints: number of checkpoints
585 * @ch_nsnapshots: number of snapshots
586 * @ch_snapshot_list: snapshot list
588 struct nilfs_cpfile_header {
589 __le64 ch_ncheckpoints;
590 __le64 ch_nsnapshots;
591 struct nilfs_snapshot_list ch_snapshot_list;
594 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
595 ((sizeof(struct nilfs_cpfile_header) + \
596 sizeof(struct nilfs_checkpoint) - 1) / \
597 sizeof(struct nilfs_checkpoint))
600 * struct nilfs_segment_usage - segment usage
601 * @su_lastmod: last modified timestamp
602 * @su_nblocks: number of blocks in segment
605 struct nilfs_segment_usage {
611 /* segment usage flag */
613 NILFS_SEGMENT_USAGE_ACTIVE,
614 NILFS_SEGMENT_USAGE_DIRTY,
615 NILFS_SEGMENT_USAGE_ERROR,
620 #define NILFS_SEGMENT_USAGE_FNS(flag, name) \
622 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
624 su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
625 (1UL << NILFS_SEGMENT_USAGE_##flag));\
628 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
631 cpu_to_le32(le32_to_cpu(su->su_flags) & \
632 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
635 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
637 return !!(le32_to_cpu(su->su_flags) & \
638 (1UL << NILFS_SEGMENT_USAGE_##flag)); \
641 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
642 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
643 NILFS_SEGMENT_USAGE_FNS(ERROR, error)
646 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
648 su->su_lastmod = cpu_to_le64(0);
649 su->su_nblocks = cpu_to_le32(0);
650 su->su_flags = cpu_to_le32(0);
654 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
656 return !le32_to_cpu(su->su_flags);
660 * struct nilfs_sufile_header - segment usage file header
661 * @sh_ncleansegs: number of clean segments
662 * @sh_ndirtysegs: number of dirty segments
663 * @sh_last_alloc: last allocated segment number
665 struct nilfs_sufile_header {
666 __le64 sh_ncleansegs;
667 __le64 sh_ndirtysegs;
668 __le64 sh_last_alloc;
672 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
673 ((sizeof(struct nilfs_sufile_header) + \
674 sizeof(struct nilfs_segment_usage) - 1) / \
675 sizeof(struct nilfs_segment_usage))
678 * nilfs_suinfo - segment usage information
683 struct nilfs_suinfo {
689 #define NILFS_SUINFO_FNS(flag, name) \
691 nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
693 return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
696 NILFS_SUINFO_FNS(ACTIVE, active)
697 NILFS_SUINFO_FNS(DIRTY, dirty)
698 NILFS_SUINFO_FNS(ERROR, error)
700 static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
702 return !si->sui_flags;
712 * struct nilfs_cpmode -
716 struct nilfs_cpmode {
723 * struct nilfs_argv - argument vector
732 __u32 v_nmembs; /* number of members */
733 __u16 v_size; /* size of members */
739 * struct nilfs_period -
743 struct nilfs_period {
749 * struct nilfs_cpstat -
750 * @cs_cno: checkpoint number
751 * @cs_ncps: number of checkpoints
752 * @cs_nsss: number of snapshots
754 struct nilfs_cpstat {
761 * struct nilfs_sustat -
762 * @ss_nsegs: number of segments
763 * @ss_ncleansegs: number of clean segments
764 * @ss_ndirtysegs: number of dirty segments
765 * @ss_ctime: creation time of the last segment
766 * @ss_nongc_ctime: creation time of the last segment not for GC
767 * @ss_prot_seq: least sequence number of segments which must not be reclaimed
769 struct nilfs_sustat {
774 __u64 ss_nongc_ctime;
779 * struct nilfs_vinfo - virtual block number information
793 * struct nilfs_vdesc -
799 struct nilfs_period vd_period;
807 * struct nilfs_bdesc -
818 #define NILFS_IOCTL_IDENT 'n'
820 #define NILFS_IOCTL_CHANGE_CPMODE \
821 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
822 #define NILFS_IOCTL_DELETE_CHECKPOINT \
823 _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
824 #define NILFS_IOCTL_GET_CPINFO \
825 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
826 #define NILFS_IOCTL_GET_CPSTAT \
827 _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
828 #define NILFS_IOCTL_GET_SUINFO \
829 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
830 #define NILFS_IOCTL_GET_SUSTAT \
831 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
832 #define NILFS_IOCTL_GET_VINFO \
833 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
834 #define NILFS_IOCTL_GET_BDESCS \
835 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
836 #define NILFS_IOCTL_CLEAN_SEGMENTS \
837 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
838 #define NILFS_IOCTL_SYNC \
839 _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
840 #define NILFS_IOCTL_RESIZE \
841 _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
843 #endif /* _LINUX_NILFS_FS_H */