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 * Written by Koji Sato and Ryusuke Konishi.
19 * linux/include/linux/ext2_fs.h
21 * Copyright (C) 1992, 1993, 1994, 1995
23 * Laboratoire MASI - Institut Blaise Pascal
24 * Universite Pierre et Marie Curie (Paris VI)
28 * linux/include/linux/minix_fs.h
30 * Copyright (C) 1991, 1992 Linus Torvalds
33 #ifndef _LINUX_NILFS_FS_H
34 #define _LINUX_NILFS_FS_H
36 #include <linux/types.h>
37 #include <linux/ioctl.h>
38 #include <linux/magic.h>
39 #include <linux/bug.h>
42 #define NILFS_INODE_BMAP_SIZE 7
44 * struct nilfs_inode - structure of an inode on disk
45 * @i_blocks: blocks count
46 * @i_size: size in bytes
47 * @i_ctime: creation time (seconds)
48 * @i_mtime: modification time (seconds)
49 * @i_ctime_nsec: creation time (nano seconds)
50 * @i_mtime_nsec: modification time (nano seconds)
54 * @i_links_count: links count
55 * @i_flags: file flags
56 * @i_bmap: block mapping
57 * @i_xattr: extended attributes
58 * @i_generation: file generation (for NFS)
73 __le64 i_bmap[NILFS_INODE_BMAP_SIZE];
74 #define i_device_code i_bmap[0]
80 #define NILFS_MIN_INODE_SIZE 128
83 * struct nilfs_super_root - structure of super root
85 * @sr_bytes: byte count of the structure
86 * @sr_flags: flags (reserved)
87 * @sr_nongc_ctime: write time of the last segment not for cleaner operation
88 * @sr_dat: DAT file inode
89 * @sr_cpfile: checkpoint file inode
90 * @sr_sufile: segment usage file inode
92 struct nilfs_super_root {
96 __le64 sr_nongc_ctime;
97 struct nilfs_inode sr_dat;
98 struct nilfs_inode sr_cpfile;
99 struct nilfs_inode sr_sufile;
102 #define NILFS_SR_MDT_OFFSET(inode_size, i) \
103 ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
105 #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
106 #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
107 #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
108 #define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3)
111 * Maximal mount counts
113 #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
116 * File system states (sbp->s_state, nilfs->ns_mount_state)
118 #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
119 #define NILFS_ERROR_FS 0x0002 /* Errors detected */
120 #define NILFS_RESIZE_FS 0x0004 /* Resize required */
123 * Mount flags (sbi->s_mount_opt)
125 #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
126 #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
127 #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
128 #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
129 #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
130 #define NILFS_MOUNT_STRICT_ORDER 0x2000 /*
131 * Apply strict in-order
132 * semantics also for data
134 #define NILFS_MOUNT_NORECOVERY 0x4000 /*
135 * Disable write access during
136 * mount-time recovery
138 #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
142 * struct nilfs_super_block - structure of super block on disk
144 struct nilfs_super_block {
145 /*00*/ __le32 s_rev_level; /* Revision level */
146 __le16 s_minor_rev_level; /* minor revision level */
147 __le16 s_magic; /* Magic signature */
150 * Bytes count of CRC calculation
151 * for this structure. s_reserved
154 __le16 s_flags; /* flags */
155 __le32 s_crc_seed; /* Seed value of CRC calculation */
156 /*10*/ __le32 s_sum; /* Check sum of super block */
158 __le32 s_log_block_size; /*
159 * Block size represented as follows
161 * 1 << (s_log_block_size + 10)
163 __le64 s_nsegments; /* Number of segments in filesystem */
164 /*20*/ __le64 s_dev_size; /* block device size in bytes */
165 __le64 s_first_data_block; /* 1st seg disk block number */
166 /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */
167 __le32 s_r_segments_percentage; /* Reserved segments percentage */
169 __le64 s_last_cno; /* Last checkpoint number */
170 /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
171 __le64 s_last_seq; /* seq. number of seg written last */
172 /*50*/ __le64 s_free_blocks_count; /* Free blocks count */
175 * Creation time (execution time of
178 /*60*/ __le64 s_mtime; /* Mount time */
179 __le64 s_wtime; /* Write time */
180 /*70*/ __le16 s_mnt_count; /* Mount count */
181 __le16 s_max_mnt_count; /* Maximal mount count */
182 __le16 s_state; /* File system state */
183 __le16 s_errors; /* Behaviour when detecting errors */
184 __le64 s_lastcheck; /* time of last check */
186 /*80*/ __le32 s_checkinterval; /* max. time between checks */
187 __le32 s_creator_os; /* OS */
188 __le16 s_def_resuid; /* Default uid for reserved blocks */
189 __le16 s_def_resgid; /* Default gid for reserved blocks */
190 __le32 s_first_ino; /* First non-reserved inode */
192 /*90*/ __le16 s_inode_size; /* Size of an inode */
193 __le16 s_dat_entry_size; /* Size of a dat entry */
194 __le16 s_checkpoint_size; /* Size of a checkpoint */
195 __le16 s_segment_usage_size; /* Size of a segment usage */
197 /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
198 /*A8*/ char s_volume_name[80]; /* volume name */
200 /*F8*/ __le32 s_c_interval; /* Commit interval of segment */
201 __le32 s_c_block_max; /*
202 * Threshold of data amount for
203 * the segment construction
205 /*100*/ __le64 s_feature_compat; /* Compatible feature set */
206 __le64 s_feature_compat_ro; /* Read-only compatible feature set */
207 __le64 s_feature_incompat; /* Incompatible feature set */
208 __u32 s_reserved[186]; /* padding to the end of the block */
212 * Codes for operating systems
214 #define NILFS_OS_LINUX 0
215 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
220 #define NILFS_CURRENT_REV 2 /* current major revision */
221 #define NILFS_MINOR_REV 0 /* minor revision */
222 #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
225 * Feature set definitions
227 * If there is a bit set in the incompatible feature set that the kernel
228 * doesn't know about, it should refuse to mount the filesystem.
230 #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL
232 #define NILFS_FEATURE_COMPAT_SUPP 0ULL
233 #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT
234 #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
237 * Bytes count of super_block for CRC-calculation
239 #define NILFS_SB_BYTES \
240 ((long)&((struct nilfs_super_block *)0)->s_reserved)
243 * Special inode number
245 #define NILFS_ROOT_INO 2 /* Root file inode */
246 #define NILFS_DAT_INO 3 /* DAT file */
247 #define NILFS_CPFILE_INO 4 /* checkpoint file */
248 #define NILFS_SUFILE_INO 5 /* segment usage file */
249 #define NILFS_IFILE_INO 6 /* ifile */
250 #define NILFS_ATIME_INO 7 /* Atime file (reserved) */
251 #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
252 #define NILFS_SKETCH_INO 10 /* Sketch file */
253 #define NILFS_USER_INO 11 /* Fisrt user's file inode number */
255 #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
257 #define NILFS_SEG_MIN_BLOCKS 16 /*
258 * Minimum number of blocks in
261 #define NILFS_PSEG_MIN_BLOCKS 2 /*
262 * Minimum number of blocks in
265 #define NILFS_MIN_NRSVSEGS 8 /*
266 * Minimum number of reserved
271 * We call DAT, cpfile, and sufile root metadata files. Inodes of
272 * these files are written in super root block instead of ifile, and
273 * garbage collector doesn't keep any past versions of these files.
275 #define NILFS_ROOT_METADATA_FILE(ino) \
276 ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
279 * bytes offset of secondary super block
281 #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
284 * Maximal count of links to a file
286 #define NILFS_LINK_MAX 32000
289 * Structure of a directory entry
293 #define NILFS_NAME_LEN 255
296 * Block size limitations
298 #define NILFS_MIN_BLOCK_SIZE 1024
299 #define NILFS_MAX_BLOCK_SIZE 65536
302 * The new version of the directory entry. Since V0 structures are
303 * stored in intel byte order, and the name_len field could never be
304 * bigger than 255 chars, it's safe to reclaim the extra byte for the
307 struct nilfs_dir_entry {
308 __le64 inode; /* Inode number */
309 __le16 rec_len; /* Directory entry length */
310 __u8 name_len; /* Name length */
311 __u8 file_type; /* Dir entry type (file, dir, etc) */
312 char name[NILFS_NAME_LEN]; /* File name */
317 * NILFS directory file types. Only the low 3 bits are used. The
318 * other bits are reserved for now.
333 * NILFS_DIR_PAD defines the directory entries boundaries
335 * NOTE: It must be a multiple of 8
337 #define NILFS_DIR_PAD 8
338 #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
339 #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
341 #define NILFS_MAX_REC_LEN ((1<<16)-1)
343 static inline unsigned int nilfs_rec_len_from_disk(__le16 dlen)
345 unsigned int len = le16_to_cpu(dlen);
347 #if !defined(__KERNEL__) || (PAGE_SIZE >= 65536)
348 if (len == NILFS_MAX_REC_LEN)
354 static inline __le16 nilfs_rec_len_to_disk(unsigned int len)
356 #if !defined(__KERNEL__) || (PAGE_SIZE >= 65536)
357 if (len == (1 << 16))
358 return cpu_to_le16(NILFS_MAX_REC_LEN);
359 else if (len > (1 << 16))
362 return cpu_to_le16(len);
366 * struct nilfs_finfo - file information
367 * @fi_ino: inode number
368 * @fi_cno: checkpoint number
369 * @fi_nblocks: number of blocks (including intermediate blocks)
370 * @fi_ndatablk: number of file data blocks
377 /* array of virtual block numbers */
381 * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
382 * @bi_vblocknr: virtual block number
383 * @bi_blkoff: block offset
385 struct nilfs_binfo_v {
391 * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
392 * @bi_blkoff: block offset
396 struct nilfs_binfo_dat {
403 * union nilfs_binfo: block information
404 * @bi_v: nilfs_binfo_v structure
405 * @bi_dat: nilfs_binfo_dat structure
408 struct nilfs_binfo_v bi_v;
409 struct nilfs_binfo_dat bi_dat;
413 * struct nilfs_segment_summary - segment summary header
414 * @ss_datasum: checksum of data
415 * @ss_sumsum: checksum of segment summary
416 * @ss_magic: magic number
417 * @ss_bytes: size of this structure in bytes
419 * @ss_seq: sequence number
420 * @ss_create: creation timestamp
421 * @ss_next: next segment
422 * @ss_nblocks: number of blocks
423 * @ss_nfinfo: number of finfo structures
424 * @ss_sumbytes: total size of segment summary in bytes
426 * @ss_cno: checkpoint number
428 struct nilfs_segment_summary {
442 /* array of finfo structures */
445 #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
448 * Segment summary flags
450 #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
451 #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
452 #define NILFS_SS_SR 0x0004 /* has super root */
453 #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
454 #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
457 * struct nilfs_btree_node - B-tree node
460 * @bn_nchildren: number of children
463 struct nilfs_btree_node {
471 #define NILFS_BTREE_NODE_ROOT 0x01
474 #define NILFS_BTREE_LEVEL_DATA 0
475 #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
476 #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */
479 * struct nilfs_palloc_group_desc - block group descriptor
480 * @pg_nfrees: number of free entries in block group
482 struct nilfs_palloc_group_desc {
487 * struct nilfs_dat_entry - disk address translation entry
488 * @de_blocknr: block number
489 * @de_start: start checkpoint number
490 * @de_end: end checkpoint number
491 * @de_rsv: reserved for future use
493 struct nilfs_dat_entry {
500 #define NILFS_MIN_DAT_ENTRY_SIZE 32
503 * struct nilfs_snapshot_list - snapshot list
504 * @ssl_next: next checkpoint number on snapshot list
505 * @ssl_prev: previous checkpoint number on snapshot list
507 struct nilfs_snapshot_list {
513 * struct nilfs_checkpoint - checkpoint structure
515 * @cp_checkpoints_count: checkpoints count in a block
516 * @cp_snapshot_list: snapshot list
517 * @cp_cno: checkpoint number
518 * @cp_create: creation timestamp
519 * @cp_nblk_inc: number of blocks incremented by this checkpoint
520 * @cp_inodes_count: inodes count
521 * @cp_blocks_count: blocks count
522 * @cp_ifile_inode: inode of ifile
524 struct nilfs_checkpoint {
526 __le32 cp_checkpoints_count;
527 struct nilfs_snapshot_list cp_snapshot_list;
531 __le64 cp_inodes_count;
532 __le64 cp_blocks_count;
535 * Do not change the byte offset of ifile inode.
536 * To keep the compatibility of the disk format,
537 * additional fields should be added behind cp_ifile_inode.
539 struct nilfs_inode cp_ifile_inode;
542 #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE)
544 /* checkpoint flags */
546 NILFS_CHECKPOINT_SNAPSHOT,
547 NILFS_CHECKPOINT_INVALID,
548 NILFS_CHECKPOINT_SKETCH,
549 NILFS_CHECKPOINT_MINOR,
552 #define NILFS_CHECKPOINT_FNS(flag, name) \
554 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
556 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
557 (1UL << NILFS_CHECKPOINT_##flag)); \
560 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
562 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
563 ~(1UL << NILFS_CHECKPOINT_##flag)); \
566 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
568 return !!(le32_to_cpu(cp->cp_flags) & \
569 (1UL << NILFS_CHECKPOINT_##flag)); \
572 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
573 NILFS_CHECKPOINT_FNS(INVALID, invalid)
574 NILFS_CHECKPOINT_FNS(MINOR, minor)
577 * struct nilfs_cpinfo - checkpoint information
580 * @ci_cno: checkpoint number
581 * @ci_create: creation timestamp
582 * @ci_nblk_inc: number of blocks incremented by this checkpoint
583 * @ci_inodes_count: inodes count
584 * @ci_blocks_count: blocks count
585 * @ci_next: next checkpoint number in snapshot list
587 struct nilfs_cpinfo {
593 __u64 ci_inodes_count;
594 __u64 ci_blocks_count;
598 #define NILFS_CPINFO_FNS(flag, name) \
600 nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
602 return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
605 NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
606 NILFS_CPINFO_FNS(INVALID, invalid)
607 NILFS_CPINFO_FNS(MINOR, minor)
611 * struct nilfs_cpfile_header - checkpoint file header
612 * @ch_ncheckpoints: number of checkpoints
613 * @ch_nsnapshots: number of snapshots
614 * @ch_snapshot_list: snapshot list
616 struct nilfs_cpfile_header {
617 __le64 ch_ncheckpoints;
618 __le64 ch_nsnapshots;
619 struct nilfs_snapshot_list ch_snapshot_list;
622 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
623 ((sizeof(struct nilfs_cpfile_header) + \
624 sizeof(struct nilfs_checkpoint) - 1) / \
625 sizeof(struct nilfs_checkpoint))
628 * struct nilfs_segment_usage - segment usage
629 * @su_lastmod: last modified timestamp
630 * @su_nblocks: number of blocks in segment
633 struct nilfs_segment_usage {
639 #define NILFS_MIN_SEGMENT_USAGE_SIZE 16
641 /* segment usage flag */
643 NILFS_SEGMENT_USAGE_ACTIVE,
644 NILFS_SEGMENT_USAGE_DIRTY,
645 NILFS_SEGMENT_USAGE_ERROR,
650 #define NILFS_SEGMENT_USAGE_FNS(flag, name) \
652 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
654 su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
655 (1UL << NILFS_SEGMENT_USAGE_##flag));\
658 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
661 cpu_to_le32(le32_to_cpu(su->su_flags) & \
662 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
665 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
667 return !!(le32_to_cpu(su->su_flags) & \
668 (1UL << NILFS_SEGMENT_USAGE_##flag)); \
671 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
672 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
673 NILFS_SEGMENT_USAGE_FNS(ERROR, error)
676 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
678 su->su_lastmod = cpu_to_le64(0);
679 su->su_nblocks = cpu_to_le32(0);
680 su->su_flags = cpu_to_le32(0);
684 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
686 return !le32_to_cpu(su->su_flags);
690 * struct nilfs_sufile_header - segment usage file header
691 * @sh_ncleansegs: number of clean segments
692 * @sh_ndirtysegs: number of dirty segments
693 * @sh_last_alloc: last allocated segment number
695 struct nilfs_sufile_header {
696 __le64 sh_ncleansegs;
697 __le64 sh_ndirtysegs;
698 __le64 sh_last_alloc;
702 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
703 ((sizeof(struct nilfs_sufile_header) + \
704 sizeof(struct nilfs_segment_usage) - 1) / \
705 sizeof(struct nilfs_segment_usage))
708 * nilfs_suinfo - segment usage information
709 * @sui_lastmod: timestamp of last modification
710 * @sui_nblocks: number of written blocks in segment
711 * @sui_flags: segment usage flags
713 struct nilfs_suinfo {
719 #define NILFS_SUINFO_FNS(flag, name) \
721 nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
723 return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
726 NILFS_SUINFO_FNS(ACTIVE, active)
727 NILFS_SUINFO_FNS(DIRTY, dirty)
728 NILFS_SUINFO_FNS(ERROR, error)
730 static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
732 return !si->sui_flags;
737 * nilfs_suinfo_update - segment usage information update
738 * @sup_segnum: segment number
739 * @sup_flags: flags for which fields are active in sup_sui
740 * @sup_reserved: reserved necessary for alignment
741 * @sup_sui: segment usage information
743 struct nilfs_suinfo_update {
747 struct nilfs_suinfo sup_sui;
751 NILFS_SUINFO_UPDATE_LASTMOD,
752 NILFS_SUINFO_UPDATE_NBLOCKS,
753 NILFS_SUINFO_UPDATE_FLAGS,
754 __NR_NILFS_SUINFO_UPDATE_FIELDS,
757 #define NILFS_SUINFO_UPDATE_FNS(flag, name) \
759 nilfs_suinfo_update_set_##name(struct nilfs_suinfo_update *sup) \
761 sup->sup_flags |= 1UL << NILFS_SUINFO_UPDATE_##flag; \
764 nilfs_suinfo_update_clear_##name(struct nilfs_suinfo_update *sup) \
766 sup->sup_flags &= ~(1UL << NILFS_SUINFO_UPDATE_##flag); \
769 nilfs_suinfo_update_##name(const struct nilfs_suinfo_update *sup) \
771 return !!(sup->sup_flags & (1UL << NILFS_SUINFO_UPDATE_##flag));\
774 NILFS_SUINFO_UPDATE_FNS(LASTMOD, lastmod)
775 NILFS_SUINFO_UPDATE_FNS(NBLOCKS, nblocks)
776 NILFS_SUINFO_UPDATE_FNS(FLAGS, flags)
784 * struct nilfs_cpmode - change checkpoint mode structure
785 * @cm_cno: checkpoint number
786 * @cm_mode: mode of checkpoint
789 struct nilfs_cpmode {
796 * struct nilfs_argv - argument vector
797 * @v_base: pointer on data array from userspace
798 * @v_nmembs: number of members in data array
799 * @v_size: size of data array in bytes
801 * @v_index: start number of target data items
805 __u32 v_nmembs; /* number of members */
806 __u16 v_size; /* size of members */
812 * struct nilfs_period - period of checkpoint numbers
813 * @p_start: start checkpoint number (inclusive)
814 * @p_end: end checkpoint number (exclusive)
816 struct nilfs_period {
822 * struct nilfs_cpstat - checkpoint statistics
823 * @cs_cno: checkpoint number
824 * @cs_ncps: number of checkpoints
825 * @cs_nsss: number of snapshots
827 struct nilfs_cpstat {
834 * struct nilfs_sustat - segment usage statistics
835 * @ss_nsegs: number of segments
836 * @ss_ncleansegs: number of clean segments
837 * @ss_ndirtysegs: number of dirty segments
838 * @ss_ctime: creation time of the last segment
839 * @ss_nongc_ctime: creation time of the last segment not for GC
840 * @ss_prot_seq: least sequence number of segments which must not be reclaimed
842 struct nilfs_sustat {
847 __u64 ss_nongc_ctime;
852 * struct nilfs_vinfo - virtual block number information
853 * @vi_vblocknr: virtual block number
854 * @vi_start: start checkpoint number (inclusive)
855 * @vi_end: end checkpoint number (exclusive)
856 * @vi_blocknr: disk block number
866 * struct nilfs_vdesc - descriptor of virtual block number
867 * @vd_ino: inode number
868 * @vd_cno: checkpoint number
869 * @vd_vblocknr: virtual block number
870 * @vd_period: period of checkpoint numbers
871 * @vd_blocknr: disk block number
872 * @vd_offset: logical block offset inside a file
873 * @vd_flags: flags (data or node block)
880 struct nilfs_period vd_period;
888 * struct nilfs_bdesc - descriptor of disk block number
889 * @bd_ino: inode number
890 * @bd_oblocknr: disk block address (for skipping dead blocks)
891 * @bd_blocknr: disk block address
892 * @bd_offset: logical block offset inside a file
893 * @bd_level: level in the b-tree organization
905 #define NILFS_IOCTL_IDENT 'n'
907 #define NILFS_IOCTL_CHANGE_CPMODE \
908 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
909 #define NILFS_IOCTL_DELETE_CHECKPOINT \
910 _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
911 #define NILFS_IOCTL_GET_CPINFO \
912 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
913 #define NILFS_IOCTL_GET_CPSTAT \
914 _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
915 #define NILFS_IOCTL_GET_SUINFO \
916 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
917 #define NILFS_IOCTL_GET_SUSTAT \
918 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
919 #define NILFS_IOCTL_GET_VINFO \
920 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
921 #define NILFS_IOCTL_GET_BDESCS \
922 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
923 #define NILFS_IOCTL_CLEAN_SEGMENTS \
924 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
925 #define NILFS_IOCTL_SYNC \
926 _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
927 #define NILFS_IOCTL_RESIZE \
928 _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
929 #define NILFS_IOCTL_SET_ALLOC_RANGE \
930 _IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2])
931 #define NILFS_IOCTL_SET_SUINFO \
932 _IOW(NILFS_IOCTL_IDENT, 0x8D, struct nilfs_argv)
934 #endif /* _LINUX_NILFS_FS_H */