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[linux-2.6-block.git] / include / linux / nilfs2_fs.h
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eed10e39
KS		 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
c486f389
RK		 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
eed10e39
KS		 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
c486f389 14 * GNU Lesser General Public License for more details.
eed10e39 15 *
c486f389 16 * You should have received a copy of the GNU Lesser General Public License
eed10e39
KS		 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>
4d3cf1bc 43#include <linux/magic.h>
eed10e39 44
eed10e39
KS		 45
46#define NILFS_INODE_BMAP_SIZE 7
47/**
48 * struct nilfs_inode - structure of an inode on disk
49 * @i_blocks: blocks count
50 * @i_size: size in bytes
61239230
RK		 51 * @i_ctime: creation time (seconds)
52 * @i_mtime: modification time (seconds)
53 * @i_ctime_nsec: creation time (nano seconds)
54 * @i_mtime_nsec: modification time (nano seconds)
eed10e39
KS		 55 * @i_uid: user id
56 * @i_gid: group id
57 * @i_mode: file mode
58 * @i_links_count: links count
59 * @i_flags: file flags
60 * @i_bmap: block mapping
61 * @i_xattr: extended attributes
62 * @i_generation: file generation (for NFS)
63 * @i_pad: padding
64 */
65struct nilfs_inode {
66 __le64 i_blocks;
67 __le64 i_size;
68 __le64 i_ctime;
69 __le64 i_mtime;
61239230
RK		 70 __le32 i_ctime_nsec;
71 __le32 i_mtime_nsec;
eed10e39
KS		 72 __le32 i_uid;
73 __le32 i_gid;
74 __le16 i_mode;
75 __le16 i_links_count;
76 __le32 i_flags;
77 __le64 i_bmap[NILFS_INODE_BMAP_SIZE];
78#define i_device_code i_bmap[0]
79 __le64 i_xattr;
80 __le32 i_generation;
81 __le32 i_pad;
82};
83
84/**
85 * struct nilfs_super_root - structure of super root
86 * @sr_sum: check sum
87 * @sr_bytes: byte count of the structure
88 * @sr_flags: flags (reserved)
89 * @sr_nongc_ctime: write time of the last segment not for cleaner operation
90 * @sr_dat: DAT file inode
91 * @sr_cpfile: checkpoint file inode
92 * @sr_sufile: segment usage file inode
93 */
94struct nilfs_super_root {
95 __le32 sr_sum;
96 __le16 sr_bytes;
97 __le16 sr_flags;
98 __le64 sr_nongc_ctime;
99 struct nilfs_inode sr_dat;
100 struct nilfs_inode sr_cpfile;
101 struct nilfs_inode sr_sufile;
102};
103
104#define NILFS_SR_MDT_OFFSET(inode_size, i) \
105 ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
106 (inode_size) * (i))
107#define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
108#define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
109#define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
110#define NILFS_SR_BYTES (sizeof(struct nilfs_super_root))
111
112/*
113 * Maximal mount counts
114 */
115#define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
116
117/*
118 * File system states (sbp->s_state, nilfs->ns_mount_state)
119 */
120#define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
121#define NILFS_ERROR_FS 0x0002 /* Errors detected */
122#define NILFS_RESIZE_FS 0x0004 /* Resize required */
123
124/*
125 * Mount flags (sbi->s_mount_opt)
126 */
127#define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
128#define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
129#define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
130#define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
eed10e39
KS		 131#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
132#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
133 semantics also for data */
0234576d
RK		 134#define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
135 mount-time recovery */
e902ec99 136#define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
eed10e39
KS		 137
138
139/**
140 * struct nilfs_super_block - structure of super block on disk
141 */
142struct nilfs_super_block {
2f1b7cd2 143/*00*/ __le32 s_rev_level; /* Revision level */
eed10e39
KS		 144 __le16 s_minor_rev_level; /* minor revision level */
145 __le16 s_magic; /* Magic signature */
146
147 __le16 s_bytes; /* Bytes count of CRC calculation
148 for this structure. s_reserved
149 is excluded. */
150 __le16 s_flags; /* flags */
151 __le32 s_crc_seed; /* Seed value of CRC calculation */
2f1b7cd2 152/*10*/ __le32 s_sum; /* Check sum of super block */
eed10e39
KS		 153
154 __le32 s_log_block_size; /* Block size represented as follows
155 blocksize =
156 1 << (s_log_block_size + 10) */
157 __le64 s_nsegments; /* Number of segments in filesystem */
2f1b7cd2 158/*20*/ __le64 s_dev_size; /* block device size in bytes */
eed10e39 159 __le64 s_first_data_block; /* 1st seg disk block number */
2f1b7cd2 160/*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */
eed10e39
KS		 161 __le32 s_r_segments_percentage; /* Reserved segments percentage */
162
163 __le64 s_last_cno; /* Last checkpoint number */
2f1b7cd2 164/*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
eed10e39 165 __le64 s_last_seq; /* seq. number of seg written last */
2f1b7cd2 166/*50*/ __le64 s_free_blocks_count; /* Free blocks count */
eed10e39
KS		 167
168 __le64 s_ctime; /* Creation time (execution time of
169 newfs) */
2f1b7cd2 170/*60*/ __le64 s_mtime; /* Mount time */
eed10e39 171 __le64 s_wtime; /* Write time */
2f1b7cd2 172/*70*/ __le16 s_mnt_count; /* Mount count */
eed10e39
KS		 173 __le16 s_max_mnt_count; /* Maximal mount count */
174 __le16 s_state; /* File system state */
175 __le16 s_errors; /* Behaviour when detecting errors */
176 __le64 s_lastcheck; /* time of last check */
177
2f1b7cd2 178/*80*/ __le32 s_checkinterval; /* max. time between checks */
eed10e39
KS		 179 __le32 s_creator_os; /* OS */
180 __le16 s_def_resuid; /* Default uid for reserved blocks */
181 __le16 s_def_resgid; /* Default gid for reserved blocks */
0d9cc233 182 __le32 s_first_ino; /* First non-reserved inode */
eed10e39 183
2f1b7cd2 184/*90*/ __le16 s_inode_size; /* Size of an inode */
eed10e39
KS		 185 __le16 s_dat_entry_size; /* Size of a dat entry */
186 __le16 s_checkpoint_size; /* Size of a checkpoint */
187 __le16 s_segment_usage_size; /* Size of a segment usage */
188
2f1b7cd2
RK		 189/*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
190/*A8*/ char s_volume_name[80]; /* volume name */
eed10e39 191
2f1b7cd2 192/*F8*/ __le32 s_c_interval; /* Commit interval of segment */
eed10e39
KS		 193 __le32 s_c_block_max; /* Threshold of data amount for
194 the segment construction */
1a80a176
RK		 195/*100*/ __le64 s_feature_compat; /* Compatible feature set */
196 __le64 s_feature_compat_ro; /* Read-only compatible feature set */
197 __le64 s_feature_incompat; /* Incompatible feature set */
198 __u32 s_reserved[186]; /* padding to the end of the block */
eed10e39
KS		 199};
200
201/*
202 * Codes for operating systems
203 */
204#define NILFS_OS_LINUX 0
205/* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
206
207/*
208 * Revision levels
209 */
210#define NILFS_CURRENT_REV 2 /* current major revision */
211#define NILFS_MINOR_REV 0 /* minor revision */
9566a7a8 212#define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
eed10e39 213
1a80a176
RK		 214/*
215 * Feature set definitions
216 *
217 * If there is a bit set in the incompatible feature set that the kernel
218 * doesn't know about, it should refuse to mount the filesystem.
219 */
be667377
RK		 220#define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL
221
1a80a176 222#define NILFS_FEATURE_COMPAT_SUPP 0ULL
be667377 223#define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT
1a80a176
RK		 224#define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
225
eed10e39
KS		 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 */
eed10e39
KS		 246
247#define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in
248 a full segment */
249#define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in
250 a partial segment */
251#define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
252 segments */
253
6c43f410
RK		 254/*
255 * We call DAT, cpfile, and sufile root metadata files. Inodes of
256 * these files are written in super root block instead of ifile, and
257 * garbage collector doesn't keep any past versions of these files.
258 */
259#define NILFS_ROOT_METADATA_FILE(ino) \
260 ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
261
e339ad31
RK		 262/*
263 * bytes offset of secondary super block
264 */
265#define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
eed10e39
KS		 266
267/*
268 * Maximal count of links to a file
269 */
270#define NILFS_LINK_MAX 32000
271
272/*
273 * Structure of a directory entry
274 * (Same as ext2)
275 */
276
277#define NILFS_NAME_LEN 255
278
89c0fd01
RK		 279/*
280 * Block size limitations
281 */
282#define NILFS_MIN_BLOCK_SIZE 1024
283#define NILFS_MAX_BLOCK_SIZE 65536
284
eed10e39
KS		 285/*
286 * The new version of the directory entry. Since V0 structures are
287 * stored in intel byte order, and the name_len field could never be
288 * bigger than 255 chars, it's safe to reclaim the extra byte for the
289 * file_type field.
290 */
291struct nilfs_dir_entry {
292 __le64 inode; /* Inode number */
293 __le16 rec_len; /* Directory entry length */
294 __u8 name_len; /* Name length */
295 __u8 file_type;
296 char name[NILFS_NAME_LEN]; /* File name */
297 char pad;
298};
299
300/*
301 * NILFS directory file types. Only the low 3 bits are used. The
302 * other bits are reserved for now.
303 */
304enum {
305 NILFS_FT_UNKNOWN,
306 NILFS_FT_REG_FILE,
307 NILFS_FT_DIR,
308 NILFS_FT_CHRDEV,
309 NILFS_FT_BLKDEV,
310 NILFS_FT_FIFO,
311 NILFS_FT_SOCK,
312 NILFS_FT_SYMLINK,
313 NILFS_FT_MAX
314};
315
316/*
317 * NILFS_DIR_PAD defines the directory entries boundaries
318 *
319 * NOTE: It must be a multiple of 8
320 */
321#define NILFS_DIR_PAD 8
322#define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1)
323#define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \
324 ~NILFS_DIR_ROUND)
6cda9fa2
RK		 325#define NILFS_MAX_REC_LEN ((1<<16)-1)
326
327static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
328{
329 unsigned len = le16_to_cpu(dlen);
330
ae191838 331#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
6cda9fa2
RK		 332 if (len == NILFS_MAX_REC_LEN)
333 return 1 << 16;
ae191838 334#endif
6cda9fa2
RK		 335 return len;
336}
337
338static inline __le16 nilfs_rec_len_to_disk(unsigned len)
339{
ae191838 340#if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536)
6cda9fa2
RK		 341 if (len == (1 << 16))
342 return cpu_to_le16(NILFS_MAX_REC_LEN);
343 else if (len > (1 << 16))
344 BUG();
ae191838 345#endif
6cda9fa2
RK		 346 return cpu_to_le16(len);
347}
eed10e39
KS		 348
349/**
350 * struct nilfs_finfo - file information
351 * @fi_ino: inode number
352 * @fi_cno: checkpoint number
353 * @fi_nblocks: number of blocks (including intermediate blocks)
354 * @fi_ndatablk: number of file data blocks
355 */
356struct nilfs_finfo {
357 __le64 fi_ino;
358 __le64 fi_cno;
359 __le32 fi_nblocks;
360 __le32 fi_ndatablk;
361 /* array of virtual block numbers */
362};
363
364/**
365 * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
366 * @bi_vblocknr: virtual block number
367 * @bi_blkoff: block offset
368 */
369struct nilfs_binfo_v {
370 __le64 bi_vblocknr;
371 __le64 bi_blkoff;
372};
373
374/**
375 * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
376 * @bi_blkoff: block offset
377 * @bi_level: level
378 * @bi_pad: padding
379 */
380struct nilfs_binfo_dat {
381 __le64 bi_blkoff;
382 __u8 bi_level;
383 __u8 bi_pad[7];
384};
385
386/**
387 * union nilfs_binfo: block information
388 * @bi_v: nilfs_binfo_v structure
389 * @bi_dat: nilfs_binfo_dat structure
390 */
391union nilfs_binfo {
392 struct nilfs_binfo_v bi_v;
393 struct nilfs_binfo_dat bi_dat;
394};
395
396/**
397 * struct nilfs_segment_summary - segment summary
398 * @ss_datasum: checksum of data
399 * @ss_sumsum: checksum of segment summary
400 * @ss_magic: magic number
401 * @ss_bytes: size of this structure in bytes
402 * @ss_flags: flags
403 * @ss_seq: sequence number
404 * @ss_create: creation timestamp
405 * @ss_next: next segment
406 * @ss_nblocks: number of blocks
407 * @ss_nfinfo: number of finfo structures
408 * @ss_sumbytes: total size of segment summary in bytes
409 * @ss_pad: padding
50614bcf 410 * @ss_cno: checkpoint number
eed10e39
KS		 411 */
412struct nilfs_segment_summary {
413 __le32 ss_datasum;
414 __le32 ss_sumsum;
415 __le32 ss_magic;
416 __le16 ss_bytes;
417 __le16 ss_flags;
418 __le64 ss_seq;
419 __le64 ss_create;
420 __le64 ss_next;
421 __le32 ss_nblocks;
422 __le32 ss_nfinfo;
423 __le32 ss_sumbytes;
424 __le32 ss_pad;
50614bcf 425 __le64 ss_cno;
eed10e39
KS		 426 /* array of finfo structures */
427};
428
429#define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
430
431/*
432 * Segment summary flags
433 */
434#define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
435#define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
436#define NILFS_SS_SR 0x0004 /* has super root */
437#define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
438#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
439
6600b9dd
JS		 440/**
441 * struct nilfs_btree_node - B-tree node
442 * @bn_flags: flags
443 * @bn_level: level
444 * @bn_nchildren: number of children
445 * @bn_pad: padding
446 */
447struct nilfs_btree_node {
448 __u8 bn_flags;
449 __u8 bn_level;
450 __le16 bn_nchildren;
451 __le32 bn_pad;
452};
453
454/* flags */
455#define NILFS_BTREE_NODE_ROOT 0x01
456
457/* level */
458#define NILFS_BTREE_LEVEL_DATA 0
459#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
460#define NILFS_BTREE_LEVEL_MAX 14
461
eed10e39
KS		 462/**
463 * struct nilfs_palloc_group_desc - block group descriptor
464 * @pg_nfrees: number of free entries in block group
465 */
466struct nilfs_palloc_group_desc {
467 __le32 pg_nfrees;
468};
469
470/**
471 * struct nilfs_dat_entry - disk address translation entry
37e11f33
QF		 472 * @de_blocknr: block number
473 * @de_start: start checkpoint number
474 * @de_end: end checkpoint number
475 * @de_rsv: reserved for future use
eed10e39
KS		 476 */
477struct nilfs_dat_entry {
478 __le64 de_blocknr;
479 __le64 de_start;
480 __le64 de_end;
481 __le64 de_rsv;
482};
483
eed10e39
KS		 484/**
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
488 */
489struct nilfs_snapshot_list {
490 __le64 ssl_next;
491 __le64 ssl_prev;
492};
493
494/**
495 * struct nilfs_checkpoint - checkpoint structure
496 * @cp_flags: flags
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
505 */
506struct nilfs_checkpoint {
507 __le32 cp_flags;
508 __le32 cp_checkpoints_count;
509 struct nilfs_snapshot_list cp_snapshot_list;
510 __le64 cp_cno;
511 __le64 cp_create;
512 __le64 cp_nblk_inc;
513 __le64 cp_inodes_count;
be667377 514 __le64 cp_blocks_count;
eed10e39
KS		 515
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;
520};
521
522/* checkpoint flags */
523enum {
524 NILFS_CHECKPOINT_SNAPSHOT,
525 NILFS_CHECKPOINT_INVALID,
526 NILFS_CHECKPOINT_SKETCH,
c96fa464 527 NILFS_CHECKPOINT_MINOR,
eed10e39
KS		 528};
529
530#define NILFS_CHECKPOINT_FNS(flag, name) \
531static inline void \
532nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
533{ \
534 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
535 (1UL << NILFS_CHECKPOINT_##flag)); \
536} \
537static inline void \
538nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \
539{ \
540 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \
541 ~(1UL << NILFS_CHECKPOINT_##flag)); \
542} \
543static inline int \
544nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
545{ \
546 return !!(le32_to_cpu(cp->cp_flags) & \
547 (1UL << NILFS_CHECKPOINT_##flag)); \
548}
549
550NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
551NILFS_CHECKPOINT_FNS(INVALID, invalid)
c96fa464 552NILFS_CHECKPOINT_FNS(MINOR, minor)
eed10e39
KS		 553
554/**
555 * struct nilfs_cpinfo - checkpoint information
556 * @ci_flags: flags
dc498d09 557 * @ci_pad: padding
eed10e39
KS		 558 * @ci_cno: checkpoint number
559 * @ci_create: creation timestamp
560 * @ci_nblk_inc: number of blocks incremented by this checkpoint
561 * @ci_inodes_count: inodes count
562 * @ci_blocks_count: blocks count
563 * @ci_next: next checkpoint number in snapshot list
564 */
565struct nilfs_cpinfo {
566 __u32 ci_flags;
dc498d09 567 __u32 ci_pad;
eed10e39
KS		 568 __u64 ci_cno;
569 __u64 ci_create;
570 __u64 ci_nblk_inc;
571 __u64 ci_inodes_count;
572 __u64 ci_blocks_count;
573 __u64 ci_next;
574};
575
576#define NILFS_CPINFO_FNS(flag, name) \
577static inline int \
578nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
579{ \
580 return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
581}
582
583NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
584NILFS_CPINFO_FNS(INVALID, invalid)
c96fa464 585NILFS_CPINFO_FNS(MINOR, minor)
eed10e39
KS		 586
587
588/**
589 * struct nilfs_cpfile_header - checkpoint file header
590 * @ch_ncheckpoints: number of checkpoints
591 * @ch_nsnapshots: number of snapshots
592 * @ch_snapshot_list: snapshot list
593 */
594struct nilfs_cpfile_header {
595 __le64 ch_ncheckpoints;
596 __le64 ch_nsnapshots;
597 struct nilfs_snapshot_list ch_snapshot_list;
598};
599
600#define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
601 ((sizeof(struct nilfs_cpfile_header) + \
602 sizeof(struct nilfs_checkpoint) - 1) / \
603 sizeof(struct nilfs_checkpoint))
604
605/**
606 * struct nilfs_segment_usage - segment usage
607 * @su_lastmod: last modified timestamp
608 * @su_nblocks: number of blocks in segment
609 * @su_flags: flags
610 */
611struct nilfs_segment_usage {
612 __le64 su_lastmod;
613 __le32 su_nblocks;
614 __le32 su_flags;
615};
616
617/* segment usage flag */
618enum {
619 NILFS_SEGMENT_USAGE_ACTIVE,
620 NILFS_SEGMENT_USAGE_DIRTY,
621 NILFS_SEGMENT_USAGE_ERROR,
622
eed10e39
KS		 623 /* ... */
624};
625
626#define NILFS_SEGMENT_USAGE_FNS(flag, name) \
627static inline void \
628nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
629{ \
630 su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
631 (1UL << NILFS_SEGMENT_USAGE_##flag));\
632} \
633static inline void \
634nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
635{ \
636 su->su_flags = \
637 cpu_to_le32(le32_to_cpu(su->su_flags) & \
638 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
639} \
640static inline int \
641nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
642{ \
643 return !!(le32_to_cpu(su->su_flags) & \
644 (1UL << NILFS_SEGMENT_USAGE_##flag)); \
645}
646
647NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
648NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
649NILFS_SEGMENT_USAGE_FNS(ERROR, error)
eed10e39
KS		 650
651static inline void
652nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
653{
654 su->su_lastmod = cpu_to_le64(0);
655 su->su_nblocks = cpu_to_le32(0);
656 su->su_flags = cpu_to_le32(0);
657}
658
659static inline int
660nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
661{
662 return !le32_to_cpu(su->su_flags);
663}
664
665/**
666 * struct nilfs_sufile_header - segment usage file header
667 * @sh_ncleansegs: number of clean segments
668 * @sh_ndirtysegs: number of dirty segments
669 * @sh_last_alloc: last allocated segment number
670 */
671struct nilfs_sufile_header {
672 __le64 sh_ncleansegs;
673 __le64 sh_ndirtysegs;
674 __le64 sh_last_alloc;
675 /* ... */
676};
677
678#define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
679 ((sizeof(struct nilfs_sufile_header) + \
680 sizeof(struct nilfs_segment_usage) - 1) / \
681 sizeof(struct nilfs_segment_usage))
682
683/**
684 * nilfs_suinfo - segment usage information
685 * @sui_lastmod:
686 * @sui_nblocks:
687 * @sui_flags:
688 */
689struct nilfs_suinfo {
690 __u64 sui_lastmod;
691 __u32 sui_nblocks;
692 __u32 sui_flags;
693};
694
695#define NILFS_SUINFO_FNS(flag, name) \
696static inline int \
697nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
698{ \
699 return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
700}
701
702NILFS_SUINFO_FNS(ACTIVE, active)
703NILFS_SUINFO_FNS(DIRTY, dirty)
704NILFS_SUINFO_FNS(ERROR, error)
eed10e39
KS		 705
706static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
707{
708 return !si->sui_flags;
709}
710
711/* ioctl */
712enum {
713 NILFS_CHECKPOINT,
714 NILFS_SNAPSHOT,
715};
716
717/**
718 * struct nilfs_cpmode -
719 * @cc_cno:
720 * @cc_mode:
721 */
722struct nilfs_cpmode {
723 __u64 cm_cno;
dc498d09
RK		 724 __u32 cm_mode;
725 __u32 cm_pad;
eed10e39
KS		 726};
727
728/**
729 * struct nilfs_argv - argument vector
730 * @v_base:
731 * @v_nmembs:
732 * @v_size:
eed10e39 733 * @v_flags:
dc498d09 734 * @v_index:
eed10e39
KS		 735 */
736struct nilfs_argv {
dc498d09
RK		 737 __u64 v_base;
738 __u32 v_nmembs; /* number of members */
739 __u16 v_size; /* size of members */
740 __u16 v_flags;
741 __u64 v_index;
eed10e39
KS		 742};
743
744/**
745 * struct nilfs_period -
746 * @p_start:
747 * @p_end:
748 */
749struct nilfs_period {
750 __u64 p_start;
751 __u64 p_end;
752};
753
754/**
755 * struct nilfs_cpstat -
756 * @cs_cno: checkpoint number
757 * @cs_ncps: number of checkpoints
758 * @cs_nsss: number of snapshots
759 */
760struct nilfs_cpstat {
761 __u64 cs_cno;
762 __u64 cs_ncps;
763 __u64 cs_nsss;
764};
765
766/**
767 * struct nilfs_sustat -
768 * @ss_nsegs: number of segments
769 * @ss_ncleansegs: number of clean segments
770 * @ss_ndirtysegs: number of dirty segments
2c2e52fc
RK		 771 * @ss_ctime: creation time of the last segment
772 * @ss_nongc_ctime: creation time of the last segment not for GC
773 * @ss_prot_seq: least sequence number of segments which must not be reclaimed
eed10e39
KS		 774 */
775struct nilfs_sustat {
776 __u64 ss_nsegs;
777 __u64 ss_ncleansegs;
778 __u64 ss_ndirtysegs;
dc498d09
RK		 779 __u64 ss_ctime;
780 __u64 ss_nongc_ctime;
2c2e52fc 781 __u64 ss_prot_seq;
eed10e39
KS		 782};
783
784/**
785 * struct nilfs_vinfo - virtual block number information
786 * @vi_vblocknr:
787 * @vi_start:
788 * @vi_end:
789 * @vi_blocknr:
790 */
791struct nilfs_vinfo {
792 __u64 vi_vblocknr;
793 __u64 vi_start;
794 __u64 vi_end;
795 __u64 vi_blocknr;
796};
797
798/**
799 * struct nilfs_vdesc -
800 */
801struct nilfs_vdesc {
802 __u64 vd_ino;
803 __u64 vd_cno;
804 __u64 vd_vblocknr;
805 struct nilfs_period vd_period;
806 __u64 vd_blocknr;
807 __u64 vd_offset;
808 __u32 vd_flags;
dc498d09 809 __u32 vd_pad;
eed10e39
KS		 810};
811
812/**
813 * struct nilfs_bdesc -
814 */
815struct nilfs_bdesc {
816 __u64 bd_ino;
817 __u64 bd_oblocknr;
818 __u64 bd_blocknr;
819 __u64 bd_offset;
820 __u32 bd_level;
dc498d09 821 __u32 bd_pad;
eed10e39
KS		 822};
823
eed10e39
KS		 824#define NILFS_IOCTL_IDENT 'n'
825
826#define NILFS_IOCTL_CHANGE_CPMODE \
827 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
828#define NILFS_IOCTL_DELETE_CHECKPOINT \
829 _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
830#define NILFS_IOCTL_GET_CPINFO \
831 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
832#define NILFS_IOCTL_GET_CPSTAT \
833 _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
834#define NILFS_IOCTL_GET_SUINFO \
835 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
836#define NILFS_IOCTL_GET_SUSTAT \
837 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
838#define NILFS_IOCTL_GET_VINFO \
839 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
840#define NILFS_IOCTL_GET_BDESCS \
841 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
842#define NILFS_IOCTL_CLEAN_SEGMENTS \
843 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
eed10e39
KS		 844#define NILFS_IOCTL_SYNC \
845 _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
846#define NILFS_IOCTL_RESIZE \
847 _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
848
eed10e39 849#endif /* _LINUX_NILFS_FS_H */
Linux 6.x block layer and io_uring tree(s)