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authorKoji Sato <sato.koji@lab.ntt.co.jp>2009-04-06 22:01:21 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 11:31:12 -0400
commiteed10e39b142eb4d284c8e4c751c0eaaa0bcd707 (patch)
treec6bf0e8f72f19dc21b16e083ef6dec091da69309
parent962281a7ab3aeb97eed004b8f0bdb0979cf35347 (diff)
nilfs2: disk format and userland interface
This adds a header file which specifies the on-disk format and ioctl interface of the nilfs2 file system. Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat
-rw-r--r--include/linux/nilfs2_fs.h854
1 files changed, 854 insertions, 0 deletions
diff --git a/include/linux/nilfs2_fs.h b/include/linux/nilfs2_fs.h
new file mode 100644
index 000000000000..e38fad2f7c0b
--- /dev/null
+++ b/include/linux/nilfs2_fs.h
@@ -0,0 +1,854 @@
1/*
2 * nilfs2_fs.h - NILFS2 on-disk structures and common declarations.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
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 General Public License for more details.
15 *
16 * You should have received a copy of the GNU 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
19 *
20 * Written by Koji Sato <koji@osrg.net>
21 * Ryusuke Konishi <ryusuke@osrg.net>
22 */
23/*
24 * linux/include/linux/ext2_fs.h
25 *
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)
30 *
31 * from
32 *
33 * linux/include/linux/minix_fs.h
34 *
35 * Copyright (C) 1991, 1992 Linus Torvalds
36 */
37
38#ifndef _LINUX_NILFS_FS_H
39#define _LINUX_NILFS_FS_H
40
41#include <linux/types.h>
42#include <linux/ioctl.h>
43
44/*
45 * Inode flags stored in nilfs_inode and on-memory nilfs inode
46 *
47 * We define these flags based on ext2-fs because of the
48 * compatibility reason; to avoid problems in chattr(1)
49 */
50#define NILFS_SECRM_FL 0x00000001 /* Secure deletion */
51#define NILFS_UNRM_FL 0x00000002 /* Undelete */
52#define NILFS_SYNC_FL 0x00000008 /* Synchronous updates */
53#define NILFS_IMMUTABLE_FL 0x00000010 /* Immutable file */
54#define NILFS_APPEND_FL 0x00000020 /* writes to file may only append */
55#define NILFS_NODUMP_FL 0x00000040 /* do not dump file */
56#define NILFS_NOATIME_FL 0x00000080 /* do not update atime */
57/* Reserved for compression usage... */
58#define NILFS_NOTAIL_FL 0x00008000 /* file tail should not be merged */
59#define NILFS_DIRSYNC_FL 0x00010000 /* dirsync behaviour */
60
61#define NILFS_FL_USER_VISIBLE 0x0003DFFF /* User visible flags */
62#define NILFS_FL_USER_MODIFIABLE 0x000380FF /* User modifiable flags */
63
64
65#define NILFS_INODE_BMAP_SIZE 7
66/**
67 * struct nilfs_inode - structure of an inode on disk
68 * @i_blocks: blocks count
69 * @i_size: size in bytes
70 * @i_ctime: creation time
71 * @i_mtime: modification time
72 * @i_dtime: deletion time
73 * @i_uid: user id
74 * @i_gid: group id
75 * @i_mode: file mode
76 * @i_links_count: links count
77 * @i_flags: file flags
78 * @i_bmap: block mapping
79 * @i_xattr: extended attributes
80 * @i_generation: file generation (for NFS)
81 * @i_pad: padding
82 */
83struct nilfs_inode {
84 __le64 i_blocks;
85 __le64 i_size;
86 __le64 i_ctime;
87 __le64 i_mtime;
88 __le64 i_dtime;
89 __le32 i_uid;
90 __le32 i_gid;
91 __le16 i_mode;
92 __le16 i_links_count;
93 __le32 i_flags;
94 __le64 i_bmap[NILFS_INODE_BMAP_SIZE];
95#define i_device_code i_bmap[0]
96 __le64 i_xattr;
97 __le32 i_generation;
98 __le32 i_pad;
99};
100
101/**
102 * struct nilfs_super_root - structure of super root
103 * @sr_sum: check sum
104 * @sr_bytes: byte count of the structure
105 * @sr_flags: flags (reserved)
106 * @sr_nongc_ctime: write time of the last segment not for cleaner operation
107 * @sr_dat: DAT file inode
108 * @sr_cpfile: checkpoint file inode
109 * @sr_sufile: segment usage file inode
110 */
111struct nilfs_super_root {
112 __le32 sr_sum;
113 __le16 sr_bytes;
114 __le16 sr_flags;
115 __le64 sr_nongc_ctime;
116 struct nilfs_inode sr_dat;
117 struct nilfs_inode sr_cpfile;
118 struct nilfs_inode sr_sufile;
119};
120
121#define NILFS_SR_MDT_OFFSET(inode_size, i) \
122 ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
123 (inode_size) * (i))
124#define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
125#define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
126#define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
127#define NILFS_SR_BYTES (sizeof(struct nilfs_super_root))
128
129/*
130 * Maximal mount counts
131 */
132#define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
133
134/*
135 * File system states (sbp->s_state, nilfs->ns_mount_state)
136 */
137#define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
138#define NILFS_ERROR_FS 0x0002 /* Errors detected */
139#define NILFS_RESIZE_FS 0x0004 /* Resize required */
140
141/*
142 * Mount flags (sbi->s_mount_opt)
143 */
144#define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
145#define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
146#define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
147#define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
148#define NILFS_MOUNT_SNAPSHOT 0x0080 /* Snapshot flag */
149#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
150#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
151 semantics also for data */
152
153
154/**
155 * struct nilfs_super_block - structure of super block on disk
156 */
157struct nilfs_super_block {
158 __le32 s_rev_level; /* Revision level */
159 __le16 s_minor_rev_level; /* minor revision level */
160 __le16 s_magic; /* Magic signature */
161
162 __le16 s_bytes; /* Bytes count of CRC calculation
163 for this structure. s_reserved
164 is excluded. */
165 __le16 s_flags; /* flags */
166 __le32 s_crc_seed; /* Seed value of CRC calculation */
167 __le32 s_sum; /* Check sum of super block */
168
169 __le32 s_log_block_size; /* Block size represented as follows
170 blocksize =
171 1 << (s_log_block_size + 10) */
172 __le64 s_nsegments; /* Number of segments in filesystem */
173 __le64 s_dev_size; /* block device size in bytes */
174 __le64 s_first_data_block; /* 1st seg disk block number */
175 __le32 s_blocks_per_segment; /* number of blocks per full segment */
176 __le32 s_r_segments_percentage; /* Reserved segments percentage */
177
178 __le64 s_last_cno; /* Last checkpoint number */
179 __le64 s_last_pseg; /* disk block addr pseg written last */
180 __le64 s_last_seq; /* seq. number of seg written last */
181 __le64 s_free_blocks_count; /* Free blocks count */
182
183 __le64 s_ctime; /* Creation time (execution time of
184 newfs) */
185 __le64 s_mtime; /* Mount time */
186 __le64 s_wtime; /* Write time */
187 __le16 s_mnt_count; /* Mount count */
188 __le16 s_max_mnt_count; /* Maximal mount count */
189 __le16 s_state; /* File system state */
190 __le16 s_errors; /* Behaviour when detecting errors */
191 __le64 s_lastcheck; /* time of last check */
192
193 __le32 s_checkinterval; /* max. time between checks */
194 __le32 s_creator_os; /* OS */
195 __le16 s_def_resuid; /* Default uid for reserved blocks */
196 __le16 s_def_resgid; /* Default gid for reserved blocks */
197 __le32 s_first_ino; /* First non-reserved inode */
198
199 __le16 s_inode_size; /* Size of an inode */
200 __le16 s_dat_entry_size; /* Size of a dat entry */
201 __le16 s_checkpoint_size; /* Size of a checkpoint */
202 __le16 s_segment_usage_size; /* Size of a segment usage */
203
204 __u8 s_uuid[16]; /* 128-bit uuid for volume */
205 char s_volume_name[16]; /* volume name */
206 char s_last_mounted[64]; /* directory where last mounted */
207
208 __le32 s_c_interval; /* Commit interval of segment */
209 __le32 s_c_block_max; /* Threshold of data amount for
210 the segment construction */
211 __u32 s_reserved[192]; /* padding to the end of the block */
212};
213
214/*
215 * Codes for operating systems
216 */
217#define NILFS_OS_LINUX 0
218/* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
219
220/*
221 * Revision levels
222 */
223#define NILFS_CURRENT_REV 2 /* current major revision */
224#define NILFS_MINOR_REV 0 /* minor revision */
225
226/*
227 * Bytes count of super_block for CRC-calculation
228 */
229#define NILFS_SB_BYTES \
230 ((long)&((struct nilfs_super_block *)0)->s_reserved)
231
232/*
233 * Special inode number
234 */
235#define NILFS_ROOT_INO 2 /* Root file inode */
236#define NILFS_DAT_INO 3 /* DAT file */
237#define NILFS_CPFILE_INO 4 /* checkpoint file */
238#define NILFS_SUFILE_INO 5 /* segment usage file */
239#define NILFS_IFILE_INO 6 /* ifile */
240#define NILFS_ATIME_INO 7 /* Atime file (reserved) */
241#define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
242#define NILFS_SKETCH_INO 10 /* Sketch file */
243#define NILFS_USER_INO 11 /* Fisrt user's file inode number */
244
245#define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
246#define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */
247
248#define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in
249 a full segment */
250#define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in
251 a partial segment */
252#define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
253 segments */
254
255
256/*
257 * Maximal count of links to a file
258 */
259#define NILFS_LINK_MAX 32000
260
261/*
262 * Structure of a directory entry
263 * (Same as ext2)
264 */
265
266#define NILFS_NAME_LEN 255
267
268/*
269 * The new version of the directory entry. Since V0 structures are
270 * stored in intel byte order, and the name_len field could never be
271 * bigger than 255 chars, it's safe to reclaim the extra byte for the
272 * file_type field.
273 */
274struct nilfs_dir_entry {
275 __le64 inode; /* Inode number */
276 __le16 rec_len; /* Directory entry length */
277 __u8 name_len; /* Name length */
278 __u8 file_type;
279 char name[NILFS_NAME_LEN]; /* File name */
280 char pad;
281};
282
283/*
284 * NILFS directory file types. Only the low 3 bits are used. The
285 * other bits are reserved for now.
286 */
287enum {
288 NILFS_FT_UNKNOWN,
289 NILFS_FT_REG_FILE,
290 NILFS_FT_DIR,
291 NILFS_FT_CHRDEV,
292 NILFS_FT_BLKDEV,
293 NILFS_FT_FIFO,
294 NILFS_FT_SOCK,
295 NILFS_FT_SYMLINK,
296 NILFS_FT_MAX
297};
298
299/*
300 * NILFS_DIR_PAD defines the directory entries boundaries
301 *
302 * NOTE: It must be a multiple of 8
303 */
304#define NILFS_DIR_PAD 8
305#define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
306#define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
307 ~NILFS_DIR_ROUND)
308
309
310/**
311 * struct nilfs_finfo - file information
312 * @fi_ino: inode number
313 * @fi_cno: checkpoint number
314 * @fi_nblocks: number of blocks (including intermediate blocks)
315 * @fi_ndatablk: number of file data blocks
316 */
317struct nilfs_finfo {
318 __le64 fi_ino;
319 __le64 fi_cno;
320 __le32 fi_nblocks;
321 __le32 fi_ndatablk;
322 /* array of virtual block numbers */
323};
324
325/**
326 * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
327 * @bi_vblocknr: virtual block number
328 * @bi_blkoff: block offset
329 */
330struct nilfs_binfo_v {
331 __le64 bi_vblocknr;
332 __le64 bi_blkoff;
333};
334
335/**
336 * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
337 * @bi_blkoff: block offset
338 * @bi_level: level
339 * @bi_pad: padding
340 */
341struct nilfs_binfo_dat {
342 __le64 bi_blkoff;
343 __u8 bi_level;
344 __u8 bi_pad[7];
345};
346
347/**
348 * union nilfs_binfo: block information
349 * @bi_v: nilfs_binfo_v structure
350 * @bi_dat: nilfs_binfo_dat structure
351 */
352union nilfs_binfo {
353 struct nilfs_binfo_v bi_v;
354 struct nilfs_binfo_dat bi_dat;
355};
356
357/**
358 * struct nilfs_segment_summary - segment summary
359 * @ss_datasum: checksum of data
360 * @ss_sumsum: checksum of segment summary
361 * @ss_magic: magic number
362 * @ss_bytes: size of this structure in bytes
363 * @ss_flags: flags
364 * @ss_seq: sequence number
365 * @ss_create: creation timestamp
366 * @ss_next: next segment
367 * @ss_nblocks: number of blocks
368 * @ss_nfinfo: number of finfo structures
369 * @ss_sumbytes: total size of segment summary in bytes
370 * @ss_pad: padding
371 */
372struct nilfs_segment_summary {
373 __le32 ss_datasum;
374 __le32 ss_sumsum;
375 __le32 ss_magic;
376 __le16 ss_bytes;
377 __le16 ss_flags;
378 __le64 ss_seq;
379 __le64 ss_create;
380 __le64 ss_next;
381 __le32 ss_nblocks;
382 __le32 ss_nfinfo;
383 __le32 ss_sumbytes;
384 __le32 ss_pad;
385 /* array of finfo structures */
386};
387
388#define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
389
390/*
391 * Segment summary flags
392 */
393#define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
394#define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
395#define NILFS_SS_SR 0x0004 /* has super root */
396#define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
397#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
398
399/**
400 * struct nilfs_palloc_group_desc - block group descriptor
401 * @pg_nfrees: number of free entries in block group
402 */
403struct nilfs_palloc_group_desc {
404 __le32 pg_nfrees;
405};
406
407/**
408 * struct nilfs_dat_entry - disk address translation entry
409 * @dt_blocknr: block number
410 * @dt_start: start checkpoint number
411 * @dt_end: end checkpoint number
412 * @dt_rsv: reserved for future use
413 */
414struct nilfs_dat_entry {
415 __le64 de_blocknr;
416 __le64 de_start;
417 __le64 de_end;
418 __le64 de_rsv;
419};
420
421/**
422 * struct nilfs_dat_group_desc - block group descriptor
423 * @dg_nfrees: number of free virtual block numbers in block group
424 */
425struct nilfs_dat_group_desc {
426 __le32 dg_nfrees;
427};
428
429
430/**
431 * struct nilfs_snapshot_list - snapshot list
432 * @ssl_next: next checkpoint number on snapshot list
433 * @ssl_prev: previous checkpoint number on snapshot list
434 */
435struct nilfs_snapshot_list {
436 __le64 ssl_next;
437 __le64 ssl_prev;
438};
439
440/**
441 * struct nilfs_checkpoint - checkpoint structure
442 * @cp_flags: flags
443 * @cp_checkpoints_count: checkpoints count in a block
444 * @cp_snapshot_list: snapshot list
445 * @cp_cno: checkpoint number
446 * @cp_create: creation timestamp
447 * @cp_nblk_inc: number of blocks incremented by this checkpoint
448 * @cp_inodes_count: inodes count
449 * @cp_blocks_count: blocks count
450 * @cp_ifile_inode: inode of ifile
451 */
452struct nilfs_checkpoint {
453 __le32 cp_flags;
454 __le32 cp_checkpoints_count;
455 struct nilfs_snapshot_list cp_snapshot_list;
456 __le64 cp_cno;
457 __le64 cp_create;
458 __le64 cp_nblk_inc;
459 __le64 cp_inodes_count;
460 __le64 cp_blocks_count; /* Reserved (might be deleted) */
461
462 /* Do not change the byte offset of ifile inode.
463 To keep the compatibility of the disk format,
464 additional fields should be added behind cp_ifile_inode. */
465 struct nilfs_inode cp_ifile_inode;
466};
467
468/* checkpoint flags */
469enum {
470 NILFS_CHECKPOINT_SNAPSHOT,
471 NILFS_CHECKPOINT_INVALID,
472 NILFS_CHECKPOINT_SKETCH,
473};
474
475#define NILFS_CHECKPOINT_FNS(flag, name) \
476static inline void \
477nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
478{ \
479 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
480 (1UL << NILFS_CHECKPOINT_##flag)); \
481} \
482static inline void \
483nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
484{ \
485 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
486 ~(1UL << NILFS_CHECKPOINT_##flag)); \
487} \
488static inline int \
489nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
490{ \
491 return !!(le32_to_cpu(cp->cp_flags) & \
492 (1UL << NILFS_CHECKPOINT_##flag)); \
493}
494
495NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
496NILFS_CHECKPOINT_FNS(INVALID, invalid)
497NILFS_CHECKPOINT_FNS(SKETCH, sketch)
498
499/**
500 * struct nilfs_cpinfo - checkpoint information
501 * @ci_flags: flags
502 * @ci_cno: checkpoint number
503 * @ci_create: creation timestamp
504 * @ci_nblk_inc: number of blocks incremented by this checkpoint
505 * @ci_inodes_count: inodes count
506 * @ci_blocks_count: blocks count
507 * @ci_next: next checkpoint number in snapshot list
508 */
509struct nilfs_cpinfo {
510 __u32 ci_flags;
511 __u64 ci_cno;
512 __u64 ci_create;
513 __u64 ci_nblk_inc;
514 __u64 ci_inodes_count;
515 __u64 ci_blocks_count;
516 __u64 ci_next;
517};
518
519#define NILFS_CPINFO_FNS(flag, name) \
520static inline int \
521nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
522{ \
523 return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
524}
525
526NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
527NILFS_CPINFO_FNS(INVALID, invalid)
528NILFS_CPINFO_FNS(SKETCH, sketch)
529
530
531/**
532 * struct nilfs_cpfile_header - checkpoint file header
533 * @ch_ncheckpoints: number of checkpoints
534 * @ch_nsnapshots: number of snapshots
535 * @ch_snapshot_list: snapshot list
536 */
537struct nilfs_cpfile_header {
538 __le64 ch_ncheckpoints;
539 __le64 ch_nsnapshots;
540 struct nilfs_snapshot_list ch_snapshot_list;
541};
542
543#define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
544 ((sizeof(struct nilfs_cpfile_header) + \
545 sizeof(struct nilfs_checkpoint) - 1) / \
546 sizeof(struct nilfs_checkpoint))
547
548/**
549 * struct nilfs_segment_usage - segment usage
550 * @su_lastmod: last modified timestamp
551 * @su_nblocks: number of blocks in segment
552 * @su_flags: flags
553 */
554struct nilfs_segment_usage {
555 __le64 su_lastmod;
556 __le32 su_nblocks;
557 __le32 su_flags;
558};
559
560/* segment usage flag */
561enum {
562 NILFS_SEGMENT_USAGE_ACTIVE,
563 NILFS_SEGMENT_USAGE_DIRTY,
564 NILFS_SEGMENT_USAGE_ERROR,
565
566 /* on-memory only */
567 NILFS_SEGMENT_USAGE_VOLATILE_ACTIVE,
568 /* ... */
569};
570
571#define NILFS_SEGMENT_USAGE_FNS(flag, name) \
572static inline void \
573nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
574{ \
575 su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
576 (1UL << NILFS_SEGMENT_USAGE_##flag));\
577} \
578static inline void \
579nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
580{ \
581 su->su_flags = \
582 cpu_to_le32(le32_to_cpu(su->su_flags) & \
583 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
584} \
585static inline int \
586nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
587{ \
588 return !!(le32_to_cpu(su->su_flags) & \
589 (1UL << NILFS_SEGMENT_USAGE_##flag)); \
590}
591
592NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
593NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
594NILFS_SEGMENT_USAGE_FNS(ERROR, error)
595NILFS_SEGMENT_USAGE_FNS(VOLATILE_ACTIVE, volatile_active)
596
597static inline void
598nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
599{
600 su->su_lastmod = cpu_to_le64(0);
601 su->su_nblocks = cpu_to_le32(0);
602 su->su_flags = cpu_to_le32(0);
603}
604
605static inline int
606nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
607{
608 return !le32_to_cpu(su->su_flags);
609}
610
611/**
612 * struct nilfs_sufile_header - segment usage file header
613 * @sh_ncleansegs: number of clean segments
614 * @sh_ndirtysegs: number of dirty segments
615 * @sh_last_alloc: last allocated segment number
616 */
617struct nilfs_sufile_header {
618 __le64 sh_ncleansegs;
619 __le64 sh_ndirtysegs;
620 __le64 sh_last_alloc;
621 /* ... */
622};
623
624#define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
625 ((sizeof(struct nilfs_sufile_header) + \
626 sizeof(struct nilfs_segment_usage) - 1) / \
627 sizeof(struct nilfs_segment_usage))
628
629/**
630 * nilfs_suinfo - segment usage information
631 * @sui_lastmod:
632 * @sui_nblocks:
633 * @sui_flags:
634 */
635struct nilfs_suinfo {
636 __u64 sui_lastmod;
637 __u32 sui_nblocks;
638 __u32 sui_flags;
639};
640
641#define NILFS_SUINFO_FNS(flag, name) \
642static inline int \
643nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
644{ \
645 return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
646}
647
648NILFS_SUINFO_FNS(ACTIVE, active)
649NILFS_SUINFO_FNS(DIRTY, dirty)
650NILFS_SUINFO_FNS(ERROR, error)
651NILFS_SUINFO_FNS(VOLATILE_ACTIVE, volatile_active)
652
653static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
654{
655 return !si->sui_flags;
656}
657
658/* ioctl */
659enum {
660 NILFS_CHECKPOINT,
661 NILFS_SNAPSHOT,
662};
663
664/**
665 * struct nilfs_cpmode -
666 * @cc_cno:
667 * @cc_mode:
668 */
669struct nilfs_cpmode {
670 __u64 cm_cno;
671 int cm_mode;
672};
673
674/**
675 * struct nilfs_argv - argument vector
676 * @v_base:
677 * @v_nmembs:
678 * @v_size:
679 * @v_index:
680 * @v_flags:
681 */
682struct nilfs_argv {
683 void *v_base;
684 size_t v_nmembs; /* number of members */
685 size_t v_size; /* size of members */
686 int v_index;
687 int v_flags;
688};
689
690/**
691 * struct nilfs_period -
692 * @p_start:
693 * @p_end:
694 */
695struct nilfs_period {
696 __u64 p_start;
697 __u64 p_end;
698};
699
700/**
701 * struct nilfs_cpstat -
702 * @cs_cno: checkpoint number
703 * @cs_ncps: number of checkpoints
704 * @cs_nsss: number of snapshots
705 */
706struct nilfs_cpstat {
707 __u64 cs_cno;
708 __u64 cs_ncps;
709 __u64 cs_nsss;
710};
711
712/**
713 * struct nilfs_sustat -
714 * @ss_nsegs: number of segments
715 * @ss_ncleansegs: number of clean segments
716 * @ss_ndirtysegs: number of dirty segments
717 * @ss_ctime:
718 * @ss_nongc_ctime:
719 */
720struct nilfs_sustat {
721 __u64 ss_nsegs;
722 __u64 ss_ncleansegs;
723 __u64 ss_ndirtysegs;
724 time_t ss_ctime;
725 time_t ss_nongc_ctime;
726};
727
728/**
729 * struct nilfs_vinfo - virtual block number information
730 * @vi_vblocknr:
731 * @vi_start:
732 * @vi_end:
733 * @vi_blocknr:
734 */
735struct nilfs_vinfo {
736 __u64 vi_vblocknr;
737 __u64 vi_start;
738 __u64 vi_end;
739 __u64 vi_blocknr;
740};
741
742/**
743 * struct nilfs_vdesc -
744 */
745struct nilfs_vdesc {
746 __u64 vd_ino;
747 __u64 vd_cno;
748 __u64 vd_vblocknr;
749 struct nilfs_period vd_period;
750 __u64 vd_blocknr;
751 __u64 vd_offset;
752 __u32 vd_flags;
753};
754
755/**
756 * struct nilfs_bdesc -
757 */
758struct nilfs_bdesc {
759 __u64 bd_ino;
760 __u64 bd_oblocknr;
761 __u64 bd_blocknr;
762 __u64 bd_offset;
763 __u32 bd_level;
764};
765
766#define NILFS_TIMEDWAIT_WRITE_LOCKED 0x1
767#define NILFS_TIMEDWAIT_SEG_WRITE 0x2
768
769/**
770 * struct nilfs_wait_cond -
771 */
772struct nilfs_wait_cond {
773 int wc_cond;
774 int wc_flags;
775 struct timespec wc_timeout;
776};
777
778#define NILFS_IOCTL_IDENT 'n'
779
780#define NILFS_IOCTL_CHANGE_CPMODE \
781 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
782#define NILFS_IOCTL_DELETE_CHECKPOINT \
783 _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
784#define NILFS_IOCTL_GET_CPINFO \
785 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
786#define NILFS_IOCTL_GET_CPSTAT \
787 _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
788#define NILFS_IOCTL_GET_SUINFO \
789 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
790#define NILFS_IOCTL_GET_SUSTAT \
791 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
792#define NILFS_IOCTL_GET_VINFO \
793 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
794#define NILFS_IOCTL_GET_BDESCS \
795 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
796#define NILFS_IOCTL_CLEAN_SEGMENTS \
797 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
798#define NILFS_IOCTL_TIMEDWAIT \
799 _IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond)
800#define NILFS_IOCTL_SYNC \
801 _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
802#define NILFS_IOCTL_RESIZE \
803 _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
804
805/* compat_ioctl */
806#ifdef CONFIG_COMPAT
807#include <linux/compat.h>
808
809struct nilfs_cpmode32 {
810 __u64 cm_cno;
811 compat_int_t cm_mode;
812};
813
814struct nilfs_argv32 {
815 compat_caddr_t v_base;
816 compat_size_t v_nmembs;
817 compat_size_t v_size;
818 compat_int_t v_index;
819 compat_int_t v_flags;
820};
821
822struct nilfs_sustat32 {
823 __u64 ss_nsegs;
824 __u64 ss_ncleansegs;
825 __u64 ss_ndirtysegs;
826 compat_time_t ss_ctime;
827 compat_time_t ss_nongc_ctime;
828};
829
830struct nilfs_wait_cond32 {
831 compat_int_t wc_cond;
832 compat_int_t wc_flags;
833 struct compat_timespec wc_timeout;
834};
835
836#define NILFS_IOCTL32_CHANGE_CPMODE \
837 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode32)
838#define NILFS_IOCTL32_GET_CPINFO \
839 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv32)
840#define NILFS_IOCTL32_GET_SUINFO \
841 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv32)
842#define NILFS_IOCTL32_GET_SUSTAT \
843 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat32)
844#define NILFS_IOCTL32_GET_VINFO \
845 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv32)
846#define NILFS_IOCTL32_GET_BDESCS \
847 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv32)
848#define NILFS_IOCTL32_CLEAN_SEGMENTS \
849 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv32[5])
850#define NILFS_IOCTL32_TIMEDWAIT \
851 _IOWR(NILFS_IOCTL_IDENT, 0x89, struct nilfs_wait_cond32)
852#endif /* CONFIG_COMPAT */
853
854#endif /* _LINUX_NILFS_FS_H */
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-03 16:08:20 -0500