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nilfs2: append blocksize info to warnings during loading super blocks
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / include / linux / nilfs2_fs.h
CommitLineData
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>
43
eed10e39
KS		 44
45#define NILFS_INODE_BMAP_SIZE 7
46/**
47 * struct nilfs_inode - structure of an inode on disk
48 * @i_blocks: blocks count
49 * @i_size: size in bytes
61239230
RK		 50 * @i_ctime: creation time (seconds)
51 * @i_mtime: modification time (seconds)
52 * @i_ctime_nsec: creation time (nano seconds)
53 * @i_mtime_nsec: modification time (nano seconds)
eed10e39
KS		 54 * @i_uid: user id
55 * @i_gid: group id
56 * @i_mode: file mode
57 * @i_links_count: links count
58 * @i_flags: file flags
59 * @i_bmap: block mapping
60 * @i_xattr: extended attributes
61 * @i_generation: file generation (for NFS)
62 * @i_pad: padding
63 */
64struct nilfs_inode {
65 __le64 i_blocks;
66 __le64 i_size;
67 __le64 i_ctime;
68 __le64 i_mtime;
61239230
RK		 69 __le32 i_ctime_nsec;
70 __le32 i_mtime_nsec;
eed10e39
KS		 71 __le32 i_uid;
72 __le32 i_gid;
73 __le16 i_mode;
74 __le16 i_links_count;
75 __le32 i_flags;
76 __le64 i_bmap[NILFS_INODE_BMAP_SIZE];
77#define i_device_code i_bmap[0]
78 __le64 i_xattr;
79 __le32 i_generation;
80 __le32 i_pad;
81};
82
83/**
84 * struct nilfs_super_root - structure of super root
85 * @sr_sum: check sum
86 * @sr_bytes: byte count of the structure
87 * @sr_flags: flags (reserved)
88 * @sr_nongc_ctime: write time of the last segment not for cleaner operation
89 * @sr_dat: DAT file inode
90 * @sr_cpfile: checkpoint file inode
91 * @sr_sufile: segment usage file inode
92 */
93struct nilfs_super_root {
94 __le32 sr_sum;
95 __le16 sr_bytes;
96 __le16 sr_flags;
97 __le64 sr_nongc_ctime;
98 struct nilfs_inode sr_dat;
99 struct nilfs_inode sr_cpfile;
100 struct nilfs_inode sr_sufile;
101};
102
103#define NILFS_SR_MDT_OFFSET(inode_size, i) \
104 ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \
105 (inode_size) * (i))
106#define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0)
107#define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1)
108#define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2)
109#define NILFS_SR_BYTES (sizeof(struct nilfs_super_root))
110
111/*
112 * Maximal mount counts
113 */
114#define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */
115
116/*
117 * File system states (sbp->s_state, nilfs->ns_mount_state)
118 */
119#define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */
120#define NILFS_ERROR_FS 0x0002 /* Errors detected */
121#define NILFS_RESIZE_FS 0x0004 /* Resize required */
122
123/*
124 * Mount flags (sbi->s_mount_opt)
125 */
126#define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */
127#define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */
128#define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */
129#define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */
eed10e39
KS		 130#define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */
131#define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order
132 semantics also for data */
0234576d
RK		 133#define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during
134 mount-time recovery */
e902ec99 135#define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */
eed10e39
KS		 136
137
138/**
139 * struct nilfs_super_block - structure of super block on disk
140 */
141struct nilfs_super_block {
2f1b7cd2 142/*00*/ __le32 s_rev_level; /* Revision level */
eed10e39
KS		 143 __le16 s_minor_rev_level; /* minor revision level */
144 __le16 s_magic; /* Magic signature */
145
146 __le16 s_bytes; /* Bytes count of CRC calculation
147 for this structure. s_reserved
148 is excluded. */
149 __le16 s_flags; /* flags */
150 __le32 s_crc_seed; /* Seed value of CRC calculation */
2f1b7cd2 151/*10*/ __le32 s_sum; /* Check sum of super block */
eed10e39
KS		 152
153 __le32 s_log_block_size; /* Block size represented as follows
154 blocksize =
155 1 << (s_log_block_size + 10) */
156 __le64 s_nsegments; /* Number of segments in filesystem */
2f1b7cd2 157/*20*/ __le64 s_dev_size; /* block device size in bytes */
eed10e39 158 __le64 s_first_data_block; /* 1st seg disk block number */
2f1b7cd2 159/*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */
eed10e39
KS		 160 __le32 s_r_segments_percentage; /* Reserved segments percentage */
161
162 __le64 s_last_cno; /* Last checkpoint number */
2f1b7cd2 163/*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */
eed10e39 164 __le64 s_last_seq; /* seq. number of seg written last */
2f1b7cd2 165/*50*/ __le64 s_free_blocks_count; /* Free blocks count */
eed10e39
KS		 166
167 __le64 s_ctime; /* Creation time (execution time of
168 newfs) */
2f1b7cd2 169/*60*/ __le64 s_mtime; /* Mount time */
eed10e39 170 __le64 s_wtime; /* Write time */
2f1b7cd2 171/*70*/ __le16 s_mnt_count; /* Mount count */
eed10e39
KS		 172 __le16 s_max_mnt_count; /* Maximal mount count */
173 __le16 s_state; /* File system state */
174 __le16 s_errors; /* Behaviour when detecting errors */
175 __le64 s_lastcheck; /* time of last check */
176
2f1b7cd2 177/*80*/ __le32 s_checkinterval; /* max. time between checks */
eed10e39
KS		 178 __le32 s_creator_os; /* OS */
179 __le16 s_def_resuid; /* Default uid for reserved blocks */
180 __le16 s_def_resgid; /* Default gid for reserved blocks */
0d9cc233 181 __le32 s_first_ino; /* First non-reserved inode */
eed10e39 182
2f1b7cd2 183/*90*/ __le16 s_inode_size; /* Size of an inode */
eed10e39
KS		 184 __le16 s_dat_entry_size; /* Size of a dat entry */
185 __le16 s_checkpoint_size; /* Size of a checkpoint */
186 __le16 s_segment_usage_size; /* Size of a segment usage */
187
2f1b7cd2
RK		 188/*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */
189/*A8*/ char s_volume_name[80]; /* volume name */
eed10e39 190
2f1b7cd2 191/*F8*/ __le32 s_c_interval; /* Commit interval of segment */
eed10e39
KS		 192 __le32 s_c_block_max; /* Threshold of data amount for
193 the segment construction */
1a80a176
RK		 194/*100*/ __le64 s_feature_compat; /* Compatible feature set */
195 __le64 s_feature_compat_ro; /* Read-only compatible feature set */
196 __le64 s_feature_incompat; /* Incompatible feature set */
197 __u32 s_reserved[186]; /* padding to the end of the block */
eed10e39
KS		 198};
199
200/*
201 * Codes for operating systems
202 */
203#define NILFS_OS_LINUX 0
204/* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */
205
206/*
207 * Revision levels
208 */
209#define NILFS_CURRENT_REV 2 /* current major revision */
210#define NILFS_MINOR_REV 0 /* minor revision */
9566a7a8 211#define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */
eed10e39 212
1a80a176
RK		 213/*
214 * Feature set definitions
215 *
216 * If there is a bit set in the incompatible feature set that the kernel
217 * doesn't know about, it should refuse to mount the filesystem.
218 */
219#define NILFS_FEATURE_COMPAT_SUPP 0ULL
220#define NILFS_FEATURE_COMPAT_RO_SUPP 0ULL
221#define NILFS_FEATURE_INCOMPAT_SUPP 0ULL
222
eed10e39
KS		 223/*
224 * Bytes count of super_block for CRC-calculation
225 */
226#define NILFS_SB_BYTES \
227 ((long)&((struct nilfs_super_block *)0)->s_reserved)
228
229/*
230 * Special inode number
231 */
232#define NILFS_ROOT_INO 2 /* Root file inode */
233#define NILFS_DAT_INO 3 /* DAT file */
234#define NILFS_CPFILE_INO 4 /* checkpoint file */
235#define NILFS_SUFILE_INO 5 /* segment usage file */
236#define NILFS_IFILE_INO 6 /* ifile */
237#define NILFS_ATIME_INO 7 /* Atime file (reserved) */
238#define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */
239#define NILFS_SKETCH_INO 10 /* Sketch file */
240#define NILFS_USER_INO 11 /* Fisrt user's file inode number */
241
242#define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */
243#define NILFS_SUPER_MAGIC 0x3434 /* NILFS filesystem magic number */
244
245#define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in
246 a full segment */
247#define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in
248 a partial segment */
249#define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved
250 segments */
251
6c43f410
RK		 252/*
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.
256 */
257#define NILFS_ROOT_METADATA_FILE(ino) \
258 ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO)
259
e339ad31
RK		 260/*
261 * bytes offset of secondary super block
262 */
263#define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12)
eed10e39
KS		 264
265/*
266 * Maximal count of links to a file
267 */
268#define NILFS_LINK_MAX 32000
269
270/*
271 * Structure of a directory entry
272 * (Same as ext2)
273 */
274
275#define NILFS_NAME_LEN 255
276
89c0fd01
RK		 277/*
278 * Block size limitations
279 */
280#define NILFS_MIN_BLOCK_SIZE 1024
281#define NILFS_MAX_BLOCK_SIZE 65536
282
eed10e39
KS		 283/*
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
287 * file_type field.
288 */
289struct 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;
294 char name[NILFS_NAME_LEN]; /* File name */
295 char pad;
296};
297
298/*
299 * NILFS directory file types. Only the low 3 bits are used. The
300 * other bits are reserved for now.
301 */
302enum {
303 NILFS_FT_UNKNOWN,
304 NILFS_FT_REG_FILE,
305 NILFS_FT_DIR,
306 NILFS_FT_CHRDEV,
307 NILFS_FT_BLKDEV,
308 NILFS_FT_FIFO,
309 NILFS_FT_SOCK,
310 NILFS_FT_SYMLINK,
311 NILFS_FT_MAX
312};
313
314/*
315 * NILFS_DIR_PAD defines the directory entries boundaries
316 *
317 * NOTE: It must be a multiple of 8
318 */
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) & \
322 ~NILFS_DIR_ROUND)
6cda9fa2
RK		 323#define NILFS_MAX_REC_LEN ((1<<16)-1)
324
325static inline unsigned nilfs_rec_len_from_disk(__le16 dlen)
326{
327 unsigned len = le16_to_cpu(dlen);
328
329 if (len == NILFS_MAX_REC_LEN)
330 return 1 << 16;
331 return len;
332}
333
334static inline __le16 nilfs_rec_len_to_disk(unsigned len)
335{
336 if (len == (1 << 16))
337 return cpu_to_le16(NILFS_MAX_REC_LEN);
338 else if (len > (1 << 16))
339 BUG();
340 return cpu_to_le16(len);
341}
eed10e39
KS		 342
343/**
344 * struct nilfs_finfo - file information
345 * @fi_ino: inode number
346 * @fi_cno: checkpoint number
347 * @fi_nblocks: number of blocks (including intermediate blocks)
348 * @fi_ndatablk: number of file data blocks
349 */
350struct nilfs_finfo {
351 __le64 fi_ino;
352 __le64 fi_cno;
353 __le32 fi_nblocks;
354 __le32 fi_ndatablk;
355 /* array of virtual block numbers */
356};
357
358/**
359 * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned
360 * @bi_vblocknr: virtual block number
361 * @bi_blkoff: block offset
362 */
363struct nilfs_binfo_v {
364 __le64 bi_vblocknr;
365 __le64 bi_blkoff;
366};
367
368/**
369 * struct nilfs_binfo_dat - information for the block which belongs to the DAT file
370 * @bi_blkoff: block offset
371 * @bi_level: level
372 * @bi_pad: padding
373 */
374struct nilfs_binfo_dat {
375 __le64 bi_blkoff;
376 __u8 bi_level;
377 __u8 bi_pad[7];
378};
379
380/**
381 * union nilfs_binfo: block information
382 * @bi_v: nilfs_binfo_v structure
383 * @bi_dat: nilfs_binfo_dat structure
384 */
385union nilfs_binfo {
386 struct nilfs_binfo_v bi_v;
387 struct nilfs_binfo_dat bi_dat;
388};
389
390/**
391 * struct nilfs_segment_summary - segment summary
392 * @ss_datasum: checksum of data
393 * @ss_sumsum: checksum of segment summary
394 * @ss_magic: magic number
395 * @ss_bytes: size of this structure in bytes
396 * @ss_flags: flags
397 * @ss_seq: sequence number
398 * @ss_create: creation timestamp
399 * @ss_next: next segment
400 * @ss_nblocks: number of blocks
401 * @ss_nfinfo: number of finfo structures
402 * @ss_sumbytes: total size of segment summary in bytes
403 * @ss_pad: padding
50614bcf 404 * @ss_cno: checkpoint number
eed10e39
KS		 405 */
406struct nilfs_segment_summary {
407 __le32 ss_datasum;
408 __le32 ss_sumsum;
409 __le32 ss_magic;
410 __le16 ss_bytes;
411 __le16 ss_flags;
412 __le64 ss_seq;
413 __le64 ss_create;
414 __le64 ss_next;
415 __le32 ss_nblocks;
416 __le32 ss_nfinfo;
417 __le32 ss_sumbytes;
418 __le32 ss_pad;
50614bcf 419 __le64 ss_cno;
eed10e39
KS		 420 /* array of finfo structures */
421};
422
423#define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */
424
425/*
426 * Segment summary flags
427 */
428#define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */
429#define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */
430#define NILFS_SS_SR 0x0004 /* has super root */
431#define NILFS_SS_SYNDT 0x0008 /* includes data only updates */
432#define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */
433
6600b9dd
JS		 434/**
435 * struct nilfs_btree_node - B-tree node
436 * @bn_flags: flags
437 * @bn_level: level
438 * @bn_nchildren: number of children
439 * @bn_pad: padding
440 */
441struct nilfs_btree_node {
442 __u8 bn_flags;
443 __u8 bn_level;
444 __le16 bn_nchildren;
445 __le32 bn_pad;
446};
447
448/* flags */
449#define NILFS_BTREE_NODE_ROOT 0x01
450
451/* level */
452#define NILFS_BTREE_LEVEL_DATA 0
453#define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1)
454#define NILFS_BTREE_LEVEL_MAX 14
455
eed10e39
KS		 456/**
457 * struct nilfs_palloc_group_desc - block group descriptor
458 * @pg_nfrees: number of free entries in block group
459 */
460struct nilfs_palloc_group_desc {
461 __le32 pg_nfrees;
462};
463
464/**
465 * struct nilfs_dat_entry - disk address translation entry
37e11f33
QF		 466 * @de_blocknr: block number
467 * @de_start: start checkpoint number
468 * @de_end: end checkpoint number
469 * @de_rsv: reserved for future use
eed10e39
KS		 470 */
471struct nilfs_dat_entry {
472 __le64 de_blocknr;
473 __le64 de_start;
474 __le64 de_end;
475 __le64 de_rsv;
476};
477
eed10e39
KS		 478/**
479 * struct nilfs_snapshot_list - snapshot list
480 * @ssl_next: next checkpoint number on snapshot list
481 * @ssl_prev: previous checkpoint number on snapshot list
482 */
483struct nilfs_snapshot_list {
484 __le64 ssl_next;
485 __le64 ssl_prev;
486};
487
488/**
489 * struct nilfs_checkpoint - checkpoint structure
490 * @cp_flags: flags
491 * @cp_checkpoints_count: checkpoints count in a block
492 * @cp_snapshot_list: snapshot list
493 * @cp_cno: checkpoint number
494 * @cp_create: creation timestamp
495 * @cp_nblk_inc: number of blocks incremented by this checkpoint
496 * @cp_inodes_count: inodes count
497 * @cp_blocks_count: blocks count
498 * @cp_ifile_inode: inode of ifile
499 */
500struct nilfs_checkpoint {
501 __le32 cp_flags;
502 __le32 cp_checkpoints_count;
503 struct nilfs_snapshot_list cp_snapshot_list;
504 __le64 cp_cno;
505 __le64 cp_create;
506 __le64 cp_nblk_inc;
507 __le64 cp_inodes_count;
508 __le64 cp_blocks_count; /* Reserved (might be deleted) */
509
510 /* Do not change the byte offset of ifile inode.
511 To keep the compatibility of the disk format,
512 additional fields should be added behind cp_ifile_inode. */
513 struct nilfs_inode cp_ifile_inode;
514};
515
516/* checkpoint flags */
517enum {
518 NILFS_CHECKPOINT_SNAPSHOT,
519 NILFS_CHECKPOINT_INVALID,
520 NILFS_CHECKPOINT_SKETCH,
c96fa464 521 NILFS_CHECKPOINT_MINOR,
eed10e39
KS		 522};
523
524#define NILFS_CHECKPOINT_FNS(flag, name) \
525static inline void \
526nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \
527{ \
528 cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \
529 (1UL << NILFS_CHECKPOINT_##flag)); \
530} \
531static inline void \
532nilfs_checkpoint_clear_##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 int \
538nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \
539{ \
540 return !!(le32_to_cpu(cp->cp_flags) & \
541 (1UL << NILFS_CHECKPOINT_##flag)); \
542}
543
544NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot)
545NILFS_CHECKPOINT_FNS(INVALID, invalid)
c96fa464 546NILFS_CHECKPOINT_FNS(MINOR, minor)
eed10e39
KS		 547
548/**
549 * struct nilfs_cpinfo - checkpoint information
550 * @ci_flags: flags
dc498d09 551 * @ci_pad: padding
eed10e39
KS		 552 * @ci_cno: checkpoint number
553 * @ci_create: creation timestamp
554 * @ci_nblk_inc: number of blocks incremented by this checkpoint
555 * @ci_inodes_count: inodes count
556 * @ci_blocks_count: blocks count
557 * @ci_next: next checkpoint number in snapshot list
558 */
559struct nilfs_cpinfo {
560 __u32 ci_flags;
dc498d09 561 __u32 ci_pad;
eed10e39
KS		 562 __u64 ci_cno;
563 __u64 ci_create;
564 __u64 ci_nblk_inc;
565 __u64 ci_inodes_count;
566 __u64 ci_blocks_count;
567 __u64 ci_next;
568};
569
570#define NILFS_CPINFO_FNS(flag, name) \
571static inline int \
572nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \
573{ \
574 return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \
575}
576
577NILFS_CPINFO_FNS(SNAPSHOT, snapshot)
578NILFS_CPINFO_FNS(INVALID, invalid)
c96fa464 579NILFS_CPINFO_FNS(MINOR, minor)
eed10e39
KS		 580
581
582/**
583 * struct nilfs_cpfile_header - checkpoint file header
584 * @ch_ncheckpoints: number of checkpoints
585 * @ch_nsnapshots: number of snapshots
586 * @ch_snapshot_list: snapshot list
587 */
588struct nilfs_cpfile_header {
589 __le64 ch_ncheckpoints;
590 __le64 ch_nsnapshots;
591 struct nilfs_snapshot_list ch_snapshot_list;
592};
593
594#define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \
595 ((sizeof(struct nilfs_cpfile_header) + \
596 sizeof(struct nilfs_checkpoint) - 1) / \
597 sizeof(struct nilfs_checkpoint))
598
599/**
600 * struct nilfs_segment_usage - segment usage
601 * @su_lastmod: last modified timestamp
602 * @su_nblocks: number of blocks in segment
603 * @su_flags: flags
604 */
605struct nilfs_segment_usage {
606 __le64 su_lastmod;
607 __le32 su_nblocks;
608 __le32 su_flags;
609};
610
611/* segment usage flag */
612enum {
613 NILFS_SEGMENT_USAGE_ACTIVE,
614 NILFS_SEGMENT_USAGE_DIRTY,
615 NILFS_SEGMENT_USAGE_ERROR,
616
eed10e39
KS		 617 /* ... */
618};
619
620#define NILFS_SEGMENT_USAGE_FNS(flag, name) \
621static inline void \
622nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \
623{ \
624 su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \
625 (1UL << NILFS_SEGMENT_USAGE_##flag));\
626} \
627static inline void \
628nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \
629{ \
630 su->su_flags = \
631 cpu_to_le32(le32_to_cpu(su->su_flags) & \
632 ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \
633} \
634static inline int \
635nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \
636{ \
637 return !!(le32_to_cpu(su->su_flags) & \
638 (1UL << NILFS_SEGMENT_USAGE_##flag)); \
639}
640
641NILFS_SEGMENT_USAGE_FNS(ACTIVE, active)
642NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty)
643NILFS_SEGMENT_USAGE_FNS(ERROR, error)
eed10e39
KS		 644
645static inline void
646nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su)
647{
648 su->su_lastmod = cpu_to_le64(0);
649 su->su_nblocks = cpu_to_le32(0);
650 su->su_flags = cpu_to_le32(0);
651}
652
653static inline int
654nilfs_segment_usage_clean(const struct nilfs_segment_usage *su)
655{
656 return !le32_to_cpu(su->su_flags);
657}
658
659/**
660 * struct nilfs_sufile_header - segment usage file header
661 * @sh_ncleansegs: number of clean segments
662 * @sh_ndirtysegs: number of dirty segments
663 * @sh_last_alloc: last allocated segment number
664 */
665struct nilfs_sufile_header {
666 __le64 sh_ncleansegs;
667 __le64 sh_ndirtysegs;
668 __le64 sh_last_alloc;
669 /* ... */
670};
671
672#define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \
673 ((sizeof(struct nilfs_sufile_header) + \
674 sizeof(struct nilfs_segment_usage) - 1) / \
675 sizeof(struct nilfs_segment_usage))
676
677/**
678 * nilfs_suinfo - segment usage information
679 * @sui_lastmod:
680 * @sui_nblocks:
681 * @sui_flags:
682 */
683struct nilfs_suinfo {
684 __u64 sui_lastmod;
685 __u32 sui_nblocks;
686 __u32 sui_flags;
687};
688
689#define NILFS_SUINFO_FNS(flag, name) \
690static inline int \
691nilfs_suinfo_##name(const struct nilfs_suinfo *si) \
692{ \
693 return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \
694}
695
696NILFS_SUINFO_FNS(ACTIVE, active)
697NILFS_SUINFO_FNS(DIRTY, dirty)
698NILFS_SUINFO_FNS(ERROR, error)
eed10e39
KS		 699
700static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si)
701{
702 return !si->sui_flags;
703}
704
705/* ioctl */
706enum {
707 NILFS_CHECKPOINT,
708 NILFS_SNAPSHOT,
709};
710
711/**
712 * struct nilfs_cpmode -
713 * @cc_cno:
714 * @cc_mode:
715 */
716struct nilfs_cpmode {
717 __u64 cm_cno;
dc498d09
RK		 718 __u32 cm_mode;
719 __u32 cm_pad;
eed10e39
KS		 720};
721
722/**
723 * struct nilfs_argv - argument vector
724 * @v_base:
725 * @v_nmembs:
726 * @v_size:
eed10e39 727 * @v_flags:
dc498d09 728 * @v_index:
eed10e39
KS		 729 */
730struct nilfs_argv {
dc498d09
RK		 731 __u64 v_base;
732 __u32 v_nmembs; /* number of members */
733 __u16 v_size; /* size of members */
734 __u16 v_flags;
735 __u64 v_index;
eed10e39
KS		 736};
737
738/**
739 * struct nilfs_period -
740 * @p_start:
741 * @p_end:
742 */
743struct nilfs_period {
744 __u64 p_start;
745 __u64 p_end;
746};
747
748/**
749 * struct nilfs_cpstat -
750 * @cs_cno: checkpoint number
751 * @cs_ncps: number of checkpoints
752 * @cs_nsss: number of snapshots
753 */
754struct nilfs_cpstat {
755 __u64 cs_cno;
756 __u64 cs_ncps;
757 __u64 cs_nsss;
758};
759
760/**
761 * struct nilfs_sustat -
762 * @ss_nsegs: number of segments
763 * @ss_ncleansegs: number of clean segments
764 * @ss_ndirtysegs: number of dirty segments
2c2e52fc
RK		 765 * @ss_ctime: creation time of the last segment
766 * @ss_nongc_ctime: creation time of the last segment not for GC
767 * @ss_prot_seq: least sequence number of segments which must not be reclaimed
eed10e39
KS		 768 */
769struct nilfs_sustat {
770 __u64 ss_nsegs;
771 __u64 ss_ncleansegs;
772 __u64 ss_ndirtysegs;
dc498d09
RK		 773 __u64 ss_ctime;
774 __u64 ss_nongc_ctime;
2c2e52fc 775 __u64 ss_prot_seq;
eed10e39
KS		 776};
777
778/**
779 * struct nilfs_vinfo - virtual block number information
780 * @vi_vblocknr:
781 * @vi_start:
782 * @vi_end:
783 * @vi_blocknr:
784 */
785struct nilfs_vinfo {
786 __u64 vi_vblocknr;
787 __u64 vi_start;
788 __u64 vi_end;
789 __u64 vi_blocknr;
790};
791
792/**
793 * struct nilfs_vdesc -
794 */
795struct nilfs_vdesc {
796 __u64 vd_ino;
797 __u64 vd_cno;
798 __u64 vd_vblocknr;
799 struct nilfs_period vd_period;
800 __u64 vd_blocknr;
801 __u64 vd_offset;
802 __u32 vd_flags;
dc498d09 803 __u32 vd_pad;
eed10e39
KS		 804};
805
806/**
807 * struct nilfs_bdesc -
808 */
809struct nilfs_bdesc {
810 __u64 bd_ino;
811 __u64 bd_oblocknr;
812 __u64 bd_blocknr;
813 __u64 bd_offset;
814 __u32 bd_level;
dc498d09 815 __u32 bd_pad;
eed10e39
KS		 816};
817
eed10e39
KS		 818#define NILFS_IOCTL_IDENT 'n'
819
820#define NILFS_IOCTL_CHANGE_CPMODE \
821 _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode)
822#define NILFS_IOCTL_DELETE_CHECKPOINT \
823 _IOW(NILFS_IOCTL_IDENT, 0x81, __u64)
824#define NILFS_IOCTL_GET_CPINFO \
825 _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv)
826#define NILFS_IOCTL_GET_CPSTAT \
827 _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat)
828#define NILFS_IOCTL_GET_SUINFO \
829 _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv)
830#define NILFS_IOCTL_GET_SUSTAT \
831 _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat)
832#define NILFS_IOCTL_GET_VINFO \
833 _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv)
834#define NILFS_IOCTL_GET_BDESCS \
835 _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv)
836#define NILFS_IOCTL_CLEAN_SEGMENTS \
837 _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5])
eed10e39
KS		 838#define NILFS_IOCTL_SYNC \
839 _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64)
840#define NILFS_IOCTL_RESIZE \
841 _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64)
842
eed10e39 843#endif /* _LINUX_NILFS_FS_H */
kernel source for telekom puls (alcatel/mediatek)