1 | /* SPDX-License-Identifier: LGPL-2.1+ WITH Linux-syscall-note */ |
2 | /* |
3 | * nilfs2_ondisk.h - NILFS2 on-disk structures |
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 |
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 |
10 | * (at your option) any later version. |
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 | |
27 | #ifndef _LINUX_NILFS2_ONDISK_H |
28 | #define _LINUX_NILFS2_ONDISK_H |
29 | |
30 | #include <linux/types.h> |
31 | #include <linux/magic.h> |
32 | #include <asm/byteorder.h> |
33 | |
34 | #define NILFS_INODE_BMAP_SIZE 7 |
35 | |
36 | /** |
37 | * struct nilfs_inode - structure of an inode on disk |
38 | * @i_blocks: blocks count |
39 | * @i_size: size in bytes |
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) |
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) |
52 | * @i_pad: padding |
53 | */ |
54 | struct nilfs_inode { |
55 | __le64 i_blocks; |
56 | __le64 i_size; |
57 | __le64 i_ctime; |
58 | __le64 i_mtime; |
59 | __le32 i_ctime_nsec; |
60 | __le32 i_mtime_nsec; |
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 | |
73 | #define NILFS_MIN_INODE_SIZE 128 |
74 | |
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) |
101 | #define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3) |
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 */ |
122 | #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ |
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 | */ |
131 | #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */ |
132 | |
133 | |
134 | /** |
135 | * struct nilfs_super_block - structure of super block on disk |
136 | */ |
137 | struct nilfs_super_block { |
138 | /*00*/ __le32 s_rev_level; /* Revision level */ |
139 | __le16 s_minor_rev_level; /* minor revision level */ |
140 | __le16 s_magic; /* Magic signature */ |
141 | |
142 | __le16 s_bytes; /* |
143 | * Bytes count of CRC calculation |
144 | * for this structure. s_reserved |
145 | * is excluded. |
146 | */ |
147 | __le16 s_flags; /* flags */ |
148 | __le32 s_crc_seed; /* Seed value of CRC calculation */ |
149 | /*10*/ __le32 s_sum; /* Check sum of super block */ |
150 | |
151 | __le32 s_log_block_size; /* |
152 | * Block size represented as follows |
153 | * blocksize = |
154 | * 1 << (s_log_block_size + 10) |
155 | */ |
156 | __le64 s_nsegments; /* Number of segments in filesystem */ |
157 | /*20*/ __le64 s_dev_size; /* block device size in bytes */ |
158 | __le64 s_first_data_block; /* 1st seg disk block number */ |
159 | /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */ |
160 | __le32 s_r_segments_percentage; /* Reserved segments percentage */ |
161 | |
162 | __le64 s_last_cno; /* Last checkpoint number */ |
163 | /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */ |
164 | __le64 s_last_seq; /* seq. number of seg written last */ |
165 | /*50*/ __le64 s_free_blocks_count; /* Free blocks count */ |
166 | |
167 | __le64 s_ctime; /* |
168 | * Creation time (execution time of |
169 | * newfs) |
170 | */ |
171 | /*60*/ __le64 s_mtime; /* Mount time */ |
172 | __le64 s_wtime; /* Write time */ |
173 | /*70*/ __le16 s_mnt_count; /* Mount count */ |
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 | |
179 | /*80*/ __le32 s_checkinterval; /* max. time between checks */ |
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 */ |
183 | __le32 s_first_ino; /* First non-reserved inode */ |
184 | |
185 | /*90*/ __le16 s_inode_size; /* Size of an inode */ |
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 | |
190 | /*98*/ __u8 s_uuid[16]; /* 128-bit uuid for volume */ |
191 | /*A8*/ char s_volume_name[80]; /* volume name */ |
192 | |
193 | /*F8*/ __le32 s_c_interval; /* Commit interval of segment */ |
194 | __le32 s_c_block_max; /* |
195 | * Threshold of data amount for |
196 | * the segment construction |
197 | */ |
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 */ |
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 */ |
215 | #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */ |
216 | |
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 | */ |
223 | #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL |
224 | |
225 | #define NILFS_FEATURE_COMPAT_SUPP 0ULL |
226 | #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT |
227 | #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL |
228 | |
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 */ |
249 | |
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 | */ |
262 | |
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 | |
271 | /* |
272 | * bytes offset of secondary super block |
273 | */ |
274 | #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) |
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 | |
288 | /* |
289 | * Block size limitations |
290 | */ |
291 | #define NILFS_MIN_BLOCK_SIZE 1024 |
292 | #define NILFS_MAX_BLOCK_SIZE 65536 |
293 | |
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 */ |
304 | __u8 file_type; /* Dir entry type (file, dir, etc) */ |
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) |
334 | #define NILFS_MAX_REC_LEN ((1 << 16) - 1) |
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; |
348 | }; |
349 | |
350 | /** |
351 | * struct nilfs_binfo_v - information on a data block (except DAT) |
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 | /** |
361 | * struct nilfs_binfo_dat - information on a DAT node block |
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 | /** |
383 | * struct nilfs_segment_summary - segment summary header |
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 |
396 | * @ss_cno: checkpoint number |
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; |
411 | __le64 ss_cno; |
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 | |
426 | /** |
427 | * struct nilfs_btree_node - header of B-tree node block |
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) |
446 | #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */ |
447 | |
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 | |
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 |
468 | * @de_blocknr: block number |
469 | * @de_start: start checkpoint number |
470 | * @de_end: end checkpoint number |
471 | * @de_rsv: reserved for future use |
472 | */ |
473 | struct nilfs_dat_entry { |
474 | __le64 de_blocknr; |
475 | __le64 de_start; |
476 | __le64 de_end; |
477 | __le64 de_rsv; |
478 | }; |
479 | |
480 | #define NILFS_MIN_DAT_ENTRY_SIZE 32 |
481 | |
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; |
512 | __le64 cp_blocks_count; |
513 | |
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 | */ |
519 | struct nilfs_inode cp_ifile_inode; |
520 | }; |
521 | |
522 | #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE) |
523 | |
524 | /* checkpoint flags */ |
525 | enum { |
526 | NILFS_CHECKPOINT_SNAPSHOT, |
527 | NILFS_CHECKPOINT_INVALID, |
528 | NILFS_CHECKPOINT_SKETCH, |
529 | NILFS_CHECKPOINT_MINOR, |
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) |
554 | NILFS_CHECKPOINT_FNS(MINOR, minor) |
555 | |
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 { |
563 | __le64 ; |
564 | __le64 ; |
565 | struct nilfs_snapshot_list ; |
566 | }; |
567 | |
568 | #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ |
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 | |
585 | #define NILFS_MIN_SEGMENT_USAGE_SIZE 16 |
586 | |
587 | /* segment usage flag */ |
588 | enum { |
589 | NILFS_SEGMENT_USAGE_ACTIVE, |
590 | NILFS_SEGMENT_USAGE_DIRTY, |
591 | NILFS_SEGMENT_USAGE_ERROR, |
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) |
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 { |
640 | __le64 ; |
641 | __le64 ; |
642 | __le64 ; |
643 | /* ... */ |
644 | }; |
645 | |
646 | #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ |
647 | ((sizeof(struct nilfs_sufile_header) + \ |
648 | sizeof(struct nilfs_segment_usage) - 1) / \ |
649 | sizeof(struct nilfs_segment_usage)) |
650 | |
651 | #endif /* _LINUX_NILFS2_ONDISK_H */ |
652 | |