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
22 * Remy Card (card@masi.ibp.fr)
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 /* Apply strict in-order
131 semantics also for data */
132 #define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
133 mount-time recovery */
134 #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
138 * struct nilfs_super_block - structure of super block on disk
140 struct nilfs_super_block {
141 /*00*/ __le32 s_rev_level; /* Revision level */
142 __le16 s_minor_rev_level; /* minor revision level */
143 __le16 s_magic; /* Magic signature */
145 __le16 s_bytes; /* Bytes count of CRC calculation
146 for this structure. s_reserved
148 __le16 s_flags; /* flags */
149 __le32 s_crc_seed; /* Seed value of CRC calculation */
150 /*10*/ __le32 s_sum; /* Check sum of super block */
152 __le32 s_log_block_size; /* Block size represented as follows
154 1 << (s_log_block_size + 10) */
155 __le64 s_nsegments; /* Number of segments in filesystem */
156 /*20*/ __le64 s_dev_size; /* block device size in bytes */
157 __le64 s_first_data_block; /* 1st seg disk block number */
158 /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */
159 __le32 s_r_segments_percentage; /* Reserved segments percentage */
161 __le64 s_last_cno; /* Last checkpoint number */
162 /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
163 __le64 s_last_seq; /* seq. number of seg written last */
164 /*50*/ __le64 s_free_blocks_count; /* Free blocks count */
166 __le64 s_ctime; /* Creation time (execution time of
168 /*60*/ __le64 s_mtime; /* Mount time */
169 __le64 s_wtime; /* Write time */
170 /*70*/ __le16 s_mnt_count; /* Mount count */
171 __le16 s_max_mnt_count; /* Maximal mount count */
172 __le16 s_state; /* File system state */
173 __le16 s_errors; /* Behaviour when detecting errors */
174 __le64 s_lastcheck; /* time of last check */
176 /*80*/ __le32 s_checkinterval; /* max. time between checks */
177 __le32 s_creator_os; /* OS */
178 __le16 s_def_resuid; /* Default uid for reserved blocks */
179 __le16 s_def_resgid; /* Default gid for reserved blocks */
180 __le32 s_first_ino; /* First non-reserved inode */
182 /*90*/ __le16 s_inode_size; /* Size of an inode */
183 __le16 s_dat_entry_size; /* Size of a dat entry */
184 __le16 s_checkpoint_size; /* Size of a checkpoint */
185 __le16 s_segment_usage_size; /* Size of a segment usage */
187 /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
188 /*A8*/ char s_volume_name[80]; /* volume name */
190 /*F8*/ __le32 s_c_interval; /* Commit interval of segment */
191 __le32 s_c_block_max; /* Threshold of data amount for
192 the segment construction */
193 /*100*/ __le64 s_feature_compat; /* Compatible feature set */
194 __le64 s_feature_compat_ro; /* Read-only compatible feature set */
195 __le64 s_feature_incompat; /* Incompatible feature set */
196 __u32 s_reserved[186]; /* padding to the end of the block */
200 * Codes for operating systems
202 #define NILFS_OS_LINUX 0
203 /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
208 #define NILFS_CURRENT_REV 2 /* current major revision */
209 #define NILFS_MINOR_REV 0 /* minor revision */
210 #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
213 * Feature set definitions
215 * If there is a bit set in the incompatible feature set that the kernel
216 * doesn't know about, it should refuse to mount the filesystem.
218 #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL
220 #define NILFS_FEATURE_COMPAT_SUPP 0ULL
221 #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT
222 #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
225 * Bytes count of super_block for CRC-calculation
227 #define NILFS_SB_BYTES \
228 ((long)&((struct nilfs_super_block *)0)->s_reserved)
231 * Special inode number
233 #define NILFS_ROOT_INO 2 /* Root file inode */
234 #define NILFS_DAT_INO 3 /* DAT file */
235 #define NILFS_CPFILE_INO 4 /* checkpoint file */
236 #define NILFS_SUFILE_INO 5 /* segment usage file */
237 #define NILFS_IFILE_INO 6 /* ifile */
238 #define NILFS_ATIME_INO 7 /* Atime file (reserved) */
239 #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
240 #define NILFS_SKETCH_INO 10 /* Sketch file */
241 #define NILFS_USER_INO 11 /* Fisrt user's file inode number */
243 #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
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 */
293 __u8 file_type; /* Dir entry type (file, dir, etc) */
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 int nilfs_rec_len_from_disk(__le16 dlen)
327 unsigned int len = le16_to_cpu(dlen);
329 #if !defined(__KERNEL__) || (PAGE_SIZE >= 65536)
330 if (len == NILFS_MAX_REC_LEN)
336 static inline __le16 nilfs_rec_len_to_disk(unsigned int len)
338 #if !defined(__KERNEL__) || (PAGE_SIZE >= 65536)
339 if (len == (1 << 16))
340 return cpu_to_le16(NILFS_MAX_REC_LEN);
341 else if (len > (1 << 16))
344 return cpu_to_le16(len);
348 * struct nilfs_finfo - file information
349 * @fi_ino: inode number
350 * @fi_cno: checkpoint number
351 * @fi_nblocks: number of blocks (including intermediate blocks)
352 * @fi_ndatablk: number of file data blocks
359 /* array of virtual block numbers */
363 * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
364 * @bi_vblocknr: virtual block number
365 * @bi_blkoff: block offset
367 struct nilfs_binfo_v {
373 * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
374 * @bi_blkoff: block offset
378 struct nilfs_binfo_dat {
385 * union nilfs_binfo: block information
386 * @bi_v: nilfs_binfo_v structure
387 * @bi_dat: nilfs_binfo_dat structure
390 struct nilfs_binfo_v bi_v;
391 struct nilfs_binfo_dat bi_dat;
395 * struct nilfs_segment_summary - segment summary header
396 * @ss_datasum: checksum of data
397 * @ss_sumsum: checksum of segment summary
398 * @ss_magic: magic number
399 * @ss_bytes: size of this structure in bytes
401 * @ss_seq: sequence number
402 * @ss_create: creation timestamp
403 * @ss_next: next segment
404 * @ss_nblocks: number of blocks
405 * @ss_nfinfo: number of finfo structures
406 * @ss_sumbytes: total size of segment summary in bytes
408 * @ss_cno: checkpoint number
410 struct nilfs_segment_summary {
424 /* array of finfo structures */
427 #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
430 * Segment summary flags
432 #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
433 #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
434 #define NILFS_SS_SR 0x0004 /* has super root */
435 #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
436 #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
439 * struct nilfs_btree_node - B-tree node
442 * @bn_nchildren: number of children
445 struct nilfs_btree_node {
453 #define NILFS_BTREE_NODE_ROOT 0x01
456 #define NILFS_BTREE_LEVEL_DATA 0
457 #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
458 #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */
461 * struct nilfs_palloc_group_desc - block group descriptor
462 * @pg_nfrees: number of free entries in block group
464 struct nilfs_palloc_group_desc {
469 * struct nilfs_dat_entry - disk address translation entry
470 * @de_blocknr: block number
471 * @de_start: start checkpoint number
472 * @de_end: end checkpoint number
473 * @de_rsv: reserved for future use
475 struct nilfs_dat_entry {
482 #define NILFS_MIN_DAT_ENTRY_SIZE 32
485 * struct nilfs_snapshot_list - snapshot list
486 * @ssl_next: next checkpoint number on snapshot list
487 * @ssl_prev: previous checkpoint number on snapshot list
489 struct nilfs_snapshot_list {
495 * struct nilfs_checkpoint - checkpoint structure
497 * @cp_checkpoints_count: checkpoints count in a block
498 * @cp_snapshot_list: snapshot list
499 * @cp_cno: checkpoint number
500 * @cp_create: creation timestamp
501 * @cp_nblk_inc: number of blocks incremented by this checkpoint
502 * @cp_inodes_count: inodes count
503 * @cp_blocks_count: blocks count
504 * @cp_ifile_inode: inode of ifile
506 struct nilfs_checkpoint {
508 __le32 cp_checkpoints_count;
509 struct nilfs_snapshot_list cp_snapshot_list;
513 __le64 cp_inodes_count;
514 __le64 cp_blocks_count;
516 /* Do not change the byte offset of ifile inode.
517 To keep the compatibility of the disk format,
518 additional fields should be added behind cp_ifile_inode. */
519 struct nilfs_inode cp_ifile_inode;
522 #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE)
524 /* checkpoint flags */
526 NILFS_CHECKPOINT_SNAPSHOT,
527 NILFS_CHECKPOINT_INVALID,
528 NILFS_CHECKPOINT_SKETCH,
529 NILFS_CHECKPOINT_MINOR,
532 #define NILFS_CHECKPOINT_FNS(flag, name) \
534 nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
536 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
537 (1UL << NILFS_CHECKPOINT_##flag)); \
540 nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
542 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
543 ~(1UL << NILFS_CHECKPOINT_##flag)); \
546 nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
548 return !!(le32_to_cpu(cp->cp_flags) & \
549 (1UL << NILFS_CHECKPOINT_##flag)); \
552 NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
553 NILFS_CHECKPOINT_FNS(INVALID, invalid)
554 NILFS_CHECKPOINT_FNS(MINOR, minor)
557 * struct nilfs_cpinfo - checkpoint information
560 * @ci_cno: checkpoint number
561 * @ci_create: creation timestamp
562 * @ci_nblk_inc: number of blocks incremented by this checkpoint
563 * @ci_inodes_count: inodes count
564 * @ci_blocks_count: blocks count
565 * @ci_next: next checkpoint number in snapshot list
567 struct nilfs_cpinfo {
573 __u64 ci_inodes_count;
574 __u64 ci_blocks_count;
578 #define NILFS_CPINFO_FNS(flag, name) \
580 nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
582 return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
585 NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
586 NILFS_CPINFO_FNS(INVALID, invalid)
587 NILFS_CPINFO_FNS(MINOR, minor)
591 * struct nilfs_cpfile_header - checkpoint file header
592 * @ch_ncheckpoints: number of checkpoints
593 * @ch_nsnapshots: number of snapshots
594 * @ch_snapshot_list: snapshot list
596 struct nilfs_cpfile_header {
597 __le64 ch_ncheckpoints;
598 __le64 ch_nsnapshots;
599 struct nilfs_snapshot_list ch_snapshot_list;
602 #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
603 ((sizeof(struct nilfs_cpfile_header) + \
604 sizeof(struct nilfs_checkpoint) - 1) / \
605 sizeof(struct nilfs_checkpoint))
608 * struct nilfs_segment_usage - segment usage
609 * @su_lastmod: last modified timestamp
610 * @su_nblocks: number of blocks in segment
613 struct nilfs_segment_usage {
619 #define NILFS_MIN_SEGMENT_USAGE_SIZE 16
621 /* segment usage flag */
623 NILFS_SEGMENT_USAGE_ACTIVE,
624 NILFS_SEGMENT_USAGE_DIRTY,
625 NILFS_SEGMENT_USAGE_ERROR,
630 #define NILFS_SEGMENT_USAGE_FNS(flag, name) \
632 nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
634 su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
635 (1UL << NILFS_SEGMENT_USAGE_##flag));\
638 nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
641 cpu_to_le32(le32_to_cpu(su->su_flags) & \
642 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
645 nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
647 return !!(le32_to_cpu(su->su_flags) & \
648 (1UL << NILFS_SEGMENT_USAGE_##flag)); \
651 NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
652 NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
653 NILFS_SEGMENT_USAGE_FNS(ERROR, error)
656 nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
658 su->su_lastmod = cpu_to_le64(0);
659 su->su_nblocks = cpu_to_le32(0);
660 su->su_flags = cpu_to_le32(0);
664 nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
666 return !le32_to_cpu(su->su_flags);
670 * struct nilfs_sufile_header - segment usage file header
671 * @sh_ncleansegs: number of clean segments
672 * @sh_ndirtysegs: number of dirty segments
673 * @sh_last_alloc: last allocated segment number
675 struct nilfs_sufile_header {
676 __le64 sh_ncleansegs;
677 __le64 sh_ndirtysegs;
678 __le64 sh_last_alloc;
682 #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
683 ((sizeof(struct nilfs_sufile_header) + \
684 sizeof(struct nilfs_segment_usage) - 1) / \
685 sizeof(struct nilfs_segment_usage))
688 * nilfs_suinfo - segment usage information
689 * @sui_lastmod: timestamp of last modification
690 * @sui_nblocks: number of written blocks in segment
691 * @sui_flags: segment usage flags
693 struct nilfs_suinfo {
699 #define NILFS_SUINFO_FNS(flag, name) \
701 nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
703 return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
706 NILFS_SUINFO_FNS(ACTIVE, active)
707 NILFS_SUINFO_FNS(DIRTY, dirty)
708 NILFS_SUINFO_FNS(ERROR, error)
710 static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
712 return !si->sui_flags;
717 * nilfs_suinfo_update - segment usage information update
718 * @sup_segnum: segment number
719 * @sup_flags: flags for which fields are active in sup_sui
720 * @sup_reserved: reserved necessary for alignment
721 * @sup_sui: segment usage information
723 struct nilfs_suinfo_update {
727 struct nilfs_suinfo sup_sui;
731 NILFS_SUINFO_UPDATE_LASTMOD,
732 NILFS_SUINFO_UPDATE_NBLOCKS,
733 NILFS_SUINFO_UPDATE_FLAGS,
734 __NR_NILFS_SUINFO_UPDATE_FIELDS,
737 #define NILFS_SUINFO_UPDATE_FNS(flag, name) \
739 nilfs_suinfo_update_set_##name(struct nilfs_suinfo_update *sup) \
741 sup->sup_flags |= 1UL << NILFS_SUINFO_UPDATE_##flag; \
744 nilfs_suinfo_update_clear_##name(struct nilfs_suinfo_update *sup) \
746 sup->sup_flags &= ~(1UL << NILFS_SUINFO_UPDATE_##flag); \
749 nilfs_suinfo_update_##name(const struct nilfs_suinfo_update *sup) \
751 return !!(sup->sup_flags & (1UL << NILFS_SUINFO_UPDATE_##flag));\
754 NILFS_SUINFO_UPDATE_FNS(LASTMOD, lastmod)
755 NILFS_SUINFO_UPDATE_FNS(NBLOCKS, nblocks)
756 NILFS_SUINFO_UPDATE_FNS(FLAGS, flags)
764 * struct nilfs_cpmode - change checkpoint mode structure
765 * @cm_cno: checkpoint number
766 * @cm_mode: mode of checkpoint
769 struct nilfs_cpmode {
776 * struct nilfs_argv - argument vector
777 * @v_base: pointer on data array from userspace
778 * @v_nmembs: number of members in data array
779 * @v_size: size of data array in bytes
781 * @v_index: start number of target data items
785 __u32 v_nmembs; /* number of members */
786 __u16 v_size; /* size of members */
792 * struct nilfs_period - period of checkpoint numbers
793 * @p_start: start checkpoint number (inclusive)
794 * @p_end: end checkpoint number (exclusive)
796 struct nilfs_period {
802 * struct nilfs_cpstat - checkpoint statistics
803 * @cs_cno: checkpoint number
804 * @cs_ncps: number of checkpoints
805 * @cs_nsss: number of snapshots
807 struct nilfs_cpstat {
814 * struct nilfs_sustat - segment usage statistics
815 * @ss_nsegs: number of segments
816 * @ss_ncleansegs: number of clean segments
817 * @ss_ndirtysegs: number of dirty segments
818 * @ss_ctime: creation time of the last segment
819 * @ss_nongc_ctime: creation time of the last segment not for GC
820 * @ss_prot_seq: least sequence number of segments which must not be reclaimed
822 struct nilfs_sustat {
827 __u64 ss_nongc_ctime;
832 * struct nilfs_vinfo - virtual block number information
833 * @vi_vblocknr: virtual block number
834 * @vi_start: start checkpoint number (inclusive)
835 * @vi_end: end checkpoint number (exclusive)
836 * @vi_blocknr: disk block number
846 * struct nilfs_vdesc - descriptor of virtual block number
847 * @vd_ino: inode number
848 * @vd_cno: checkpoint number
849 * @vd_vblocknr: virtual block number
850 * @vd_period: period of checkpoint numbers
851 * @vd_blocknr: disk block number
852 * @vd_offset: logical block offset inside a file
853 * @vd_flags: flags (data or node block)
860 struct nilfs_period vd_period;
868 * struct nilfs_bdesc - descriptor of disk block number
869 * @bd_ino: inode number
870 * @bd_oblocknr: disk block address (for skipping dead blocks)
871 * @bd_blocknr: disk block address
872 * @bd_offset: logical block offset inside a file
873 * @bd_level: level in the b-tree organization
885 #define NILFS_IOCTL_IDENT 'n'
887 #define NILFS_IOCTL_CHANGE_CPMODE \
888 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
889 #define NILFS_IOCTL_DELETE_CHECKPOINT \
890 _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
891 #define NILFS_IOCTL_GET_CPINFO \
892 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
893 #define NILFS_IOCTL_GET_CPSTAT \
894 _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
895 #define NILFS_IOCTL_GET_SUINFO \
896 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
897 #define NILFS_IOCTL_GET_SUSTAT \
898 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
899 #define NILFS_IOCTL_GET_VINFO \
900 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
901 #define NILFS_IOCTL_GET_BDESCS \
902 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
903 #define NILFS_IOCTL_CLEAN_SEGMENTS \
904 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
905 #define NILFS_IOCTL_SYNC \
906 _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
907 #define NILFS_IOCTL_RESIZE \
908 _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
909 #define NILFS_IOCTL_SET_ALLOC_RANGE \
910 _IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2])
911 #define NILFS_IOCTL_SET_SUINFO \
912 _IOW(NILFS_IOCTL_IDENT, 0x8D, struct nilfs_argv)
914 #endif /* _LINUX_NILFS_FS_H */