]>
Commit | Line | Data |
---|---|---|
e2be04c7 | 1 | /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ |
eed10e39 | 2 | /* |
e63e88bc | 3 | * nilfs2_ondisk.h - NILFS2 on-disk structures |
eed10e39 KS |
4 | * |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
7 | * This program is free software; you can redistribute it and/or modify | |
c486f389 RK |
8 | * it under the terms of the GNU Lesser General Public License as published |
9 | * by the Free Software Foundation; either version 2.1 of the License, or | |
eed10e39 | 10 | * (at your option) any later version. |
eed10e39 KS |
11 | */ |
12 | /* | |
13 | * linux/include/linux/ext2_fs.h | |
14 | * | |
15 | * Copyright (C) 1992, 1993, 1994, 1995 | |
16 | * Remy Card (card@masi.ibp.fr) | |
17 | * Laboratoire MASI - Institut Blaise Pascal | |
18 | * Universite Pierre et Marie Curie (Paris VI) | |
19 | * | |
20 | * from | |
21 | * | |
22 | * linux/include/linux/minix_fs.h | |
23 | * | |
24 | * Copyright (C) 1991, 1992 Linus Torvalds | |
25 | */ | |
26 | ||
e63e88bc RK |
27 | #ifndef _LINUX_NILFS2_ONDISK_H |
28 | #define _LINUX_NILFS2_ONDISK_H | |
eed10e39 KS |
29 | |
30 | #include <linux/types.h> | |
4d3cf1bc | 31 | #include <linux/magic.h> |
eed10e39 | 32 | |
eed10e39 KS |
33 | |
34 | #define NILFS_INODE_BMAP_SIZE 7 | |
e63e88bc | 35 | |
eed10e39 KS |
36 | /** |
37 | * struct nilfs_inode - structure of an inode on disk | |
38 | * @i_blocks: blocks count | |
39 | * @i_size: size in bytes | |
61239230 RK |
40 | * @i_ctime: creation time (seconds) |
41 | * @i_mtime: modification time (seconds) | |
42 | * @i_ctime_nsec: creation time (nano seconds) | |
43 | * @i_mtime_nsec: modification time (nano seconds) | |
eed10e39 KS |
44 | * @i_uid: user id |
45 | * @i_gid: group id | |
46 | * @i_mode: file mode | |
47 | * @i_links_count: links count | |
48 | * @i_flags: file flags | |
49 | * @i_bmap: block mapping | |
50 | * @i_xattr: extended attributes | |
51 | * @i_generation: file generation (for NFS) | |
e63e88bc | 52 | * @i_pad: padding |
eed10e39 KS |
53 | */ |
54 | struct nilfs_inode { | |
55 | __le64 i_blocks; | |
56 | __le64 i_size; | |
57 | __le64 i_ctime; | |
58 | __le64 i_mtime; | |
61239230 RK |
59 | __le32 i_ctime_nsec; |
60 | __le32 i_mtime_nsec; | |
eed10e39 KS |
61 | __le32 i_uid; |
62 | __le32 i_gid; | |
63 | __le16 i_mode; | |
64 | __le16 i_links_count; | |
65 | __le32 i_flags; | |
66 | __le64 i_bmap[NILFS_INODE_BMAP_SIZE]; | |
67 | #define i_device_code i_bmap[0] | |
68 | __le64 i_xattr; | |
69 | __le32 i_generation; | |
70 | __le32 i_pad; | |
71 | }; | |
72 | ||
0ec060d1 RK |
73 | #define NILFS_MIN_INODE_SIZE 128 |
74 | ||
eed10e39 KS |
75 | /** |
76 | * struct nilfs_super_root - structure of super root | |
77 | * @sr_sum: check sum | |
78 | * @sr_bytes: byte count of the structure | |
79 | * @sr_flags: flags (reserved) | |
80 | * @sr_nongc_ctime: write time of the last segment not for cleaner operation | |
81 | * @sr_dat: DAT file inode | |
82 | * @sr_cpfile: checkpoint file inode | |
83 | * @sr_sufile: segment usage file inode | |
84 | */ | |
85 | struct nilfs_super_root { | |
86 | __le32 sr_sum; | |
87 | __le16 sr_bytes; | |
88 | __le16 sr_flags; | |
89 | __le64 sr_nongc_ctime; | |
90 | struct nilfs_inode sr_dat; | |
91 | struct nilfs_inode sr_cpfile; | |
92 | struct nilfs_inode sr_sufile; | |
93 | }; | |
94 | ||
95 | #define NILFS_SR_MDT_OFFSET(inode_size, i) \ | |
96 | ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \ | |
97 | (inode_size) * (i)) | |
98 | #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0) | |
99 | #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1) | |
100 | #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2) | |
6c6de1aa | 101 | #define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3) |
eed10e39 KS |
102 | |
103 | /* | |
104 | * Maximal mount counts | |
105 | */ | |
106 | #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */ | |
107 | ||
108 | /* | |
109 | * File system states (sbp->s_state, nilfs->ns_mount_state) | |
110 | */ | |
111 | #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */ | |
112 | #define NILFS_ERROR_FS 0x0002 /* Errors detected */ | |
113 | #define NILFS_RESIZE_FS 0x0004 /* Resize required */ | |
114 | ||
115 | /* | |
116 | * Mount flags (sbi->s_mount_opt) | |
117 | */ | |
118 | #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */ | |
119 | #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ | |
120 | #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ | |
121 | #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ | |
eed10e39 | 122 | #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ |
076a378b RK |
123 | #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* |
124 | * Apply strict in-order | |
125 | * semantics also for data | |
126 | */ | |
127 | #define NILFS_MOUNT_NORECOVERY 0x4000 /* | |
128 | * Disable write access during | |
129 | * mount-time recovery | |
130 | */ | |
e902ec99 | 131 | #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */ |
eed10e39 KS |
132 | |
133 | ||
134 | /** | |
135 | * struct nilfs_super_block - structure of super block on disk | |
136 | */ | |
137 | struct nilfs_super_block { | |
2f1b7cd2 | 138 | /*00*/ __le32 s_rev_level; /* Revision level */ |
eed10e39 KS |
139 | __le16 s_minor_rev_level; /* minor revision level */ |
140 | __le16 s_magic; /* Magic signature */ | |
141 | ||
076a378b RK |
142 | __le16 s_bytes; /* |
143 | * Bytes count of CRC calculation | |
144 | * for this structure. s_reserved | |
145 | * is excluded. | |
146 | */ | |
eed10e39 KS |
147 | __le16 s_flags; /* flags */ |
148 | __le32 s_crc_seed; /* Seed value of CRC calculation */ | |
2f1b7cd2 | 149 | /*10*/ __le32 s_sum; /* Check sum of super block */ |
eed10e39 | 150 | |
076a378b RK |
151 | __le32 s_log_block_size; /* |
152 | * Block size represented as follows | |
153 | * blocksize = | |
154 | * 1 << (s_log_block_size + 10) | |
155 | */ | |
eed10e39 | 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 | 166 | |
076a378b RK |
167 | __le64 s_ctime; /* |
168 | * Creation time (execution time of | |
169 | * newfs) | |
170 | */ | |
2f1b7cd2 | 171 | /*60*/ __le64 s_mtime; /* Mount time */ |
eed10e39 | 172 | __le64 s_wtime; /* Write time */ |
2f1b7cd2 | 173 | /*70*/ __le16 s_mnt_count; /* Mount count */ |
eed10e39 KS |
174 | __le16 s_max_mnt_count; /* Maximal mount count */ |
175 | __le16 s_state; /* File system state */ | |
176 | __le16 s_errors; /* Behaviour when detecting errors */ | |
177 | __le64 s_lastcheck; /* time of last check */ | |
178 | ||
2f1b7cd2 | 179 | /*80*/ __le32 s_checkinterval; /* max. time between checks */ |
eed10e39 KS |
180 | __le32 s_creator_os; /* OS */ |
181 | __le16 s_def_resuid; /* Default uid for reserved blocks */ | |
182 | __le16 s_def_resgid; /* Default gid for reserved blocks */ | |
0d9cc233 | 183 | __le32 s_first_ino; /* First non-reserved inode */ |
eed10e39 | 184 | |
2f1b7cd2 | 185 | /*90*/ __le16 s_inode_size; /* Size of an inode */ |
eed10e39 KS |
186 | __le16 s_dat_entry_size; /* Size of a dat entry */ |
187 | __le16 s_checkpoint_size; /* Size of a checkpoint */ | |
188 | __le16 s_segment_usage_size; /* Size of a segment usage */ | |
189 | ||
2f1b7cd2 RK |
190 | /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
191 | /*A8*/ char s_volume_name[80]; /* volume name */ | |
eed10e39 | 192 | |
2f1b7cd2 | 193 | /*F8*/ __le32 s_c_interval; /* Commit interval of segment */ |
076a378b RK |
194 | __le32 s_c_block_max; /* |
195 | * Threshold of data amount for | |
196 | * the segment construction | |
197 | */ | |
1a80a176 RK |
198 | /*100*/ __le64 s_feature_compat; /* Compatible feature set */ |
199 | __le64 s_feature_compat_ro; /* Read-only compatible feature set */ | |
200 | __le64 s_feature_incompat; /* Incompatible feature set */ | |
201 | __u32 s_reserved[186]; /* padding to the end of the block */ | |
eed10e39 KS |
202 | }; |
203 | ||
204 | /* | |
205 | * Codes for operating systems | |
206 | */ | |
207 | #define NILFS_OS_LINUX 0 | |
208 | /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ | |
209 | ||
210 | /* | |
211 | * Revision levels | |
212 | */ | |
213 | #define NILFS_CURRENT_REV 2 /* current major revision */ | |
214 | #define NILFS_MINOR_REV 0 /* minor revision */ | |
9566a7a8 | 215 | #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */ |
eed10e39 | 216 | |
1a80a176 RK |
217 | /* |
218 | * Feature set definitions | |
219 | * | |
220 | * If there is a bit set in the incompatible feature set that the kernel | |
221 | * doesn't know about, it should refuse to mount the filesystem. | |
222 | */ | |
be667377 RK |
223 | #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL |
224 | ||
1a80a176 | 225 | #define NILFS_FEATURE_COMPAT_SUPP 0ULL |
be667377 | 226 | #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT |
1a80a176 RK |
227 | #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL |
228 | ||
eed10e39 KS |
229 | /* |
230 | * Bytes count of super_block for CRC-calculation | |
231 | */ | |
232 | #define NILFS_SB_BYTES \ | |
233 | ((long)&((struct nilfs_super_block *)0)->s_reserved) | |
234 | ||
235 | /* | |
236 | * Special inode number | |
237 | */ | |
238 | #define NILFS_ROOT_INO 2 /* Root file inode */ | |
239 | #define NILFS_DAT_INO 3 /* DAT file */ | |
240 | #define NILFS_CPFILE_INO 4 /* checkpoint file */ | |
241 | #define NILFS_SUFILE_INO 5 /* segment usage file */ | |
242 | #define NILFS_IFILE_INO 6 /* ifile */ | |
243 | #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ | |
244 | #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ | |
245 | #define NILFS_SKETCH_INO 10 /* Sketch file */ | |
246 | #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ | |
247 | ||
248 | #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ | |
eed10e39 | 249 | |
076a378b RK |
250 | #define NILFS_SEG_MIN_BLOCKS 16 /* |
251 | * Minimum number of blocks in | |
252 | * a full segment | |
253 | */ | |
254 | #define NILFS_PSEG_MIN_BLOCKS 2 /* | |
255 | * Minimum number of blocks in | |
256 | * a partial segment | |
257 | */ | |
258 | #define NILFS_MIN_NRSVSEGS 8 /* | |
259 | * Minimum number of reserved | |
260 | * segments | |
261 | */ | |
eed10e39 | 262 | |
6c43f410 RK |
263 | /* |
264 | * We call DAT, cpfile, and sufile root metadata files. Inodes of | |
265 | * these files are written in super root block instead of ifile, and | |
266 | * garbage collector doesn't keep any past versions of these files. | |
267 | */ | |
268 | #define NILFS_ROOT_METADATA_FILE(ino) \ | |
269 | ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO) | |
270 | ||
e339ad31 RK |
271 | /* |
272 | * bytes offset of secondary super block | |
273 | */ | |
274 | #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) | |
eed10e39 KS |
275 | |
276 | /* | |
277 | * Maximal count of links to a file | |
278 | */ | |
279 | #define NILFS_LINK_MAX 32000 | |
280 | ||
281 | /* | |
282 | * Structure of a directory entry | |
283 | * (Same as ext2) | |
284 | */ | |
285 | ||
286 | #define NILFS_NAME_LEN 255 | |
287 | ||
89c0fd01 RK |
288 | /* |
289 | * Block size limitations | |
290 | */ | |
291 | #define NILFS_MIN_BLOCK_SIZE 1024 | |
292 | #define NILFS_MAX_BLOCK_SIZE 65536 | |
293 | ||
eed10e39 KS |
294 | /* |
295 | * The new version of the directory entry. Since V0 structures are | |
296 | * stored in intel byte order, and the name_len field could never be | |
297 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
298 | * file_type field. | |
299 | */ | |
300 | struct nilfs_dir_entry { | |
301 | __le64 inode; /* Inode number */ | |
302 | __le16 rec_len; /* Directory entry length */ | |
303 | __u8 name_len; /* Name length */ | |
8c74ac05 | 304 | __u8 file_type; /* Dir entry type (file, dir, etc) */ |
eed10e39 KS |
305 | char name[NILFS_NAME_LEN]; /* File name */ |
306 | char pad; | |
307 | }; | |
308 | ||
309 | /* | |
310 | * NILFS directory file types. Only the low 3 bits are used. The | |
311 | * other bits are reserved for now. | |
312 | */ | |
313 | enum { | |
314 | NILFS_FT_UNKNOWN, | |
315 | NILFS_FT_REG_FILE, | |
316 | NILFS_FT_DIR, | |
317 | NILFS_FT_CHRDEV, | |
318 | NILFS_FT_BLKDEV, | |
319 | NILFS_FT_FIFO, | |
320 | NILFS_FT_SOCK, | |
321 | NILFS_FT_SYMLINK, | |
322 | NILFS_FT_MAX | |
323 | }; | |
324 | ||
325 | /* | |
326 | * NILFS_DIR_PAD defines the directory entries boundaries | |
327 | * | |
328 | * NOTE: It must be a multiple of 8 | |
329 | */ | |
330 | #define NILFS_DIR_PAD 8 | |
331 | #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) | |
332 | #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ | |
333 | ~NILFS_DIR_ROUND) | |
e63e88bc | 334 | #define NILFS_MAX_REC_LEN ((1 << 16) - 1) |
eed10e39 KS |
335 | |
336 | /** | |
337 | * struct nilfs_finfo - file information | |
338 | * @fi_ino: inode number | |
339 | * @fi_cno: checkpoint number | |
340 | * @fi_nblocks: number of blocks (including intermediate blocks) | |
341 | * @fi_ndatablk: number of file data blocks | |
342 | */ | |
343 | struct nilfs_finfo { | |
344 | __le64 fi_ino; | |
345 | __le64 fi_cno; | |
346 | __le32 fi_nblocks; | |
347 | __le32 fi_ndatablk; | |
eed10e39 KS |
348 | }; |
349 | ||
350 | /** | |
e63e88bc | 351 | * struct nilfs_binfo_v - information on a data block (except DAT) |
eed10e39 KS |
352 | * @bi_vblocknr: virtual block number |
353 | * @bi_blkoff: block offset | |
354 | */ | |
355 | struct nilfs_binfo_v { | |
356 | __le64 bi_vblocknr; | |
357 | __le64 bi_blkoff; | |
358 | }; | |
359 | ||
360 | /** | |
e63e88bc | 361 | * struct nilfs_binfo_dat - information on a DAT node block |
eed10e39 KS |
362 | * @bi_blkoff: block offset |
363 | * @bi_level: level | |
364 | * @bi_pad: padding | |
365 | */ | |
366 | struct nilfs_binfo_dat { | |
367 | __le64 bi_blkoff; | |
368 | __u8 bi_level; | |
369 | __u8 bi_pad[7]; | |
370 | }; | |
371 | ||
372 | /** | |
373 | * union nilfs_binfo: block information | |
374 | * @bi_v: nilfs_binfo_v structure | |
375 | * @bi_dat: nilfs_binfo_dat structure | |
376 | */ | |
377 | union nilfs_binfo { | |
378 | struct nilfs_binfo_v bi_v; | |
379 | struct nilfs_binfo_dat bi_dat; | |
380 | }; | |
381 | ||
382 | /** | |
8c74ac05 | 383 | * struct nilfs_segment_summary - segment summary header |
eed10e39 KS |
384 | * @ss_datasum: checksum of data |
385 | * @ss_sumsum: checksum of segment summary | |
386 | * @ss_magic: magic number | |
387 | * @ss_bytes: size of this structure in bytes | |
388 | * @ss_flags: flags | |
389 | * @ss_seq: sequence number | |
390 | * @ss_create: creation timestamp | |
391 | * @ss_next: next segment | |
392 | * @ss_nblocks: number of blocks | |
393 | * @ss_nfinfo: number of finfo structures | |
394 | * @ss_sumbytes: total size of segment summary in bytes | |
395 | * @ss_pad: padding | |
50614bcf | 396 | * @ss_cno: checkpoint number |
eed10e39 KS |
397 | */ |
398 | struct nilfs_segment_summary { | |
399 | __le32 ss_datasum; | |
400 | __le32 ss_sumsum; | |
401 | __le32 ss_magic; | |
402 | __le16 ss_bytes; | |
403 | __le16 ss_flags; | |
404 | __le64 ss_seq; | |
405 | __le64 ss_create; | |
406 | __le64 ss_next; | |
407 | __le32 ss_nblocks; | |
408 | __le32 ss_nfinfo; | |
409 | __le32 ss_sumbytes; | |
410 | __le32 ss_pad; | |
50614bcf | 411 | __le64 ss_cno; |
eed10e39 KS |
412 | /* array of finfo structures */ |
413 | }; | |
414 | ||
415 | #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ | |
416 | ||
417 | /* | |
418 | * Segment summary flags | |
419 | */ | |
420 | #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ | |
421 | #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ | |
422 | #define NILFS_SS_SR 0x0004 /* has super root */ | |
423 | #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ | |
424 | #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ | |
425 | ||
6600b9dd | 426 | /** |
e63e88bc | 427 | * struct nilfs_btree_node - header of B-tree node block |
6600b9dd JS |
428 | * @bn_flags: flags |
429 | * @bn_level: level | |
430 | * @bn_nchildren: number of children | |
431 | * @bn_pad: padding | |
432 | */ | |
433 | struct nilfs_btree_node { | |
434 | __u8 bn_flags; | |
435 | __u8 bn_level; | |
436 | __le16 bn_nchildren; | |
437 | __le32 bn_pad; | |
438 | }; | |
439 | ||
440 | /* flags */ | |
441 | #define NILFS_BTREE_NODE_ROOT 0x01 | |
442 | ||
443 | /* level */ | |
444 | #define NILFS_BTREE_LEVEL_DATA 0 | |
445 | #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) | |
d8fd150f | 446 | #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */ |
6600b9dd | 447 | |
e63e88bc RK |
448 | /** |
449 | * struct nilfs_direct_node - header of built-in bmap array | |
450 | * @dn_flags: flags | |
451 | * @dn_pad: padding | |
452 | */ | |
453 | struct nilfs_direct_node { | |
454 | __u8 dn_flags; | |
455 | __u8 pad[7]; | |
456 | }; | |
457 | ||
eed10e39 KS |
458 | /** |
459 | * struct nilfs_palloc_group_desc - block group descriptor | |
460 | * @pg_nfrees: number of free entries in block group | |
461 | */ | |
462 | struct nilfs_palloc_group_desc { | |
463 | __le32 pg_nfrees; | |
464 | }; | |
465 | ||
466 | /** | |
467 | * struct nilfs_dat_entry - disk address translation entry | |
37e11f33 QF |
468 | * @de_blocknr: block number |
469 | * @de_start: start checkpoint number | |
470 | * @de_end: end checkpoint number | |
471 | * @de_rsv: reserved for future use | |
eed10e39 KS |
472 | */ |
473 | struct nilfs_dat_entry { | |
474 | __le64 de_blocknr; | |
475 | __le64 de_start; | |
476 | __le64 de_end; | |
477 | __le64 de_rsv; | |
478 | }; | |
479 | ||
0ec060d1 RK |
480 | #define NILFS_MIN_DAT_ENTRY_SIZE 32 |
481 | ||
eed10e39 KS |
482 | /** |
483 | * struct nilfs_snapshot_list - snapshot list | |
484 | * @ssl_next: next checkpoint number on snapshot list | |
485 | * @ssl_prev: previous checkpoint number on snapshot list | |
486 | */ | |
487 | struct nilfs_snapshot_list { | |
488 | __le64 ssl_next; | |
489 | __le64 ssl_prev; | |
490 | }; | |
491 | ||
492 | /** | |
493 | * struct nilfs_checkpoint - checkpoint structure | |
494 | * @cp_flags: flags | |
495 | * @cp_checkpoints_count: checkpoints count in a block | |
496 | * @cp_snapshot_list: snapshot list | |
497 | * @cp_cno: checkpoint number | |
498 | * @cp_create: creation timestamp | |
499 | * @cp_nblk_inc: number of blocks incremented by this checkpoint | |
500 | * @cp_inodes_count: inodes count | |
501 | * @cp_blocks_count: blocks count | |
502 | * @cp_ifile_inode: inode of ifile | |
503 | */ | |
504 | struct nilfs_checkpoint { | |
505 | __le32 cp_flags; | |
506 | __le32 cp_checkpoints_count; | |
507 | struct nilfs_snapshot_list cp_snapshot_list; | |
508 | __le64 cp_cno; | |
509 | __le64 cp_create; | |
510 | __le64 cp_nblk_inc; | |
511 | __le64 cp_inodes_count; | |
be667377 | 512 | __le64 cp_blocks_count; |
eed10e39 | 513 | |
076a378b RK |
514 | /* |
515 | * Do not change the byte offset of ifile inode. | |
516 | * To keep the compatibility of the disk format, | |
517 | * additional fields should be added behind cp_ifile_inode. | |
518 | */ | |
eed10e39 KS |
519 | struct nilfs_inode cp_ifile_inode; |
520 | }; | |
521 | ||
0ec060d1 RK |
522 | #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE) |
523 | ||
eed10e39 KS |
524 | /* checkpoint flags */ |
525 | enum { | |
526 | NILFS_CHECKPOINT_SNAPSHOT, | |
527 | NILFS_CHECKPOINT_INVALID, | |
528 | NILFS_CHECKPOINT_SKETCH, | |
c96fa464 | 529 | NILFS_CHECKPOINT_MINOR, |
eed10e39 KS |
530 | }; |
531 | ||
532 | #define NILFS_CHECKPOINT_FNS(flag, name) \ | |
533 | static inline void \ | |
534 | nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \ | |
535 | { \ | |
536 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \ | |
537 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
538 | } \ | |
539 | static inline void \ | |
540 | nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \ | |
541 | { \ | |
542 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \ | |
543 | ~(1UL << NILFS_CHECKPOINT_##flag)); \ | |
544 | } \ | |
545 | static inline int \ | |
546 | nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \ | |
547 | { \ | |
548 | return !!(le32_to_cpu(cp->cp_flags) & \ | |
549 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
550 | } | |
551 | ||
552 | NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot) | |
553 | NILFS_CHECKPOINT_FNS(INVALID, invalid) | |
c96fa464 | 554 | NILFS_CHECKPOINT_FNS(MINOR, minor) |
eed10e39 | 555 | |
eed10e39 KS |
556 | /** |
557 | * struct nilfs_cpfile_header - checkpoint file header | |
558 | * @ch_ncheckpoints: number of checkpoints | |
559 | * @ch_nsnapshots: number of snapshots | |
560 | * @ch_snapshot_list: snapshot list | |
561 | */ | |
562 | struct nilfs_cpfile_header { | |
563 | __le64 ch_ncheckpoints; | |
564 | __le64 ch_nsnapshots; | |
565 | struct nilfs_snapshot_list ch_snapshot_list; | |
566 | }; | |
567 | ||
e63e88bc | 568 | #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ |
eed10e39 KS |
569 | ((sizeof(struct nilfs_cpfile_header) + \ |
570 | sizeof(struct nilfs_checkpoint) - 1) / \ | |
571 | sizeof(struct nilfs_checkpoint)) | |
572 | ||
573 | /** | |
574 | * struct nilfs_segment_usage - segment usage | |
575 | * @su_lastmod: last modified timestamp | |
576 | * @su_nblocks: number of blocks in segment | |
577 | * @su_flags: flags | |
578 | */ | |
579 | struct nilfs_segment_usage { | |
580 | __le64 su_lastmod; | |
581 | __le32 su_nblocks; | |
582 | __le32 su_flags; | |
583 | }; | |
584 | ||
0ec060d1 RK |
585 | #define NILFS_MIN_SEGMENT_USAGE_SIZE 16 |
586 | ||
eed10e39 KS |
587 | /* segment usage flag */ |
588 | enum { | |
589 | NILFS_SEGMENT_USAGE_ACTIVE, | |
590 | NILFS_SEGMENT_USAGE_DIRTY, | |
591 | NILFS_SEGMENT_USAGE_ERROR, | |
eed10e39 KS |
592 | }; |
593 | ||
594 | #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ | |
595 | static inline void \ | |
596 | nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ | |
597 | { \ | |
598 | su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \ | |
599 | (1UL << NILFS_SEGMENT_USAGE_##flag));\ | |
600 | } \ | |
601 | static inline void \ | |
602 | nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ | |
603 | { \ | |
604 | su->su_flags = \ | |
605 | cpu_to_le32(le32_to_cpu(su->su_flags) & \ | |
606 | ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
607 | } \ | |
608 | static inline int \ | |
609 | nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ | |
610 | { \ | |
611 | return !!(le32_to_cpu(su->su_flags) & \ | |
612 | (1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
613 | } | |
614 | ||
615 | NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) | |
616 | NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) | |
617 | NILFS_SEGMENT_USAGE_FNS(ERROR, error) | |
eed10e39 KS |
618 | |
619 | static inline void | |
620 | nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) | |
621 | { | |
622 | su->su_lastmod = cpu_to_le64(0); | |
623 | su->su_nblocks = cpu_to_le32(0); | |
624 | su->su_flags = cpu_to_le32(0); | |
625 | } | |
626 | ||
627 | static inline int | |
628 | nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) | |
629 | { | |
630 | return !le32_to_cpu(su->su_flags); | |
631 | } | |
632 | ||
633 | /** | |
634 | * struct nilfs_sufile_header - segment usage file header | |
635 | * @sh_ncleansegs: number of clean segments | |
636 | * @sh_ndirtysegs: number of dirty segments | |
637 | * @sh_last_alloc: last allocated segment number | |
638 | */ | |
639 | struct nilfs_sufile_header { | |
640 | __le64 sh_ncleansegs; | |
641 | __le64 sh_ndirtysegs; | |
642 | __le64 sh_last_alloc; | |
643 | /* ... */ | |
644 | }; | |
645 | ||
e63e88bc | 646 | #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ |
eed10e39 KS |
647 | ((sizeof(struct nilfs_sufile_header) + \ |
648 | sizeof(struct nilfs_segment_usage) - 1) / \ | |
649 | sizeof(struct nilfs_segment_usage)) | |
650 | ||
e63e88bc | 651 | #endif /* _LINUX_NILFS2_ONDISK_H */ |