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eed10e39 | 1 | /* |
e63e88bc | 2 | * nilfs2_ondisk.h - NILFS2 on-disk structures |
eed10e39 KS |
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 | 9 | * (at your option) any later version. |
eed10e39 KS |
10 | */ |
11 | /* | |
12 | * linux/include/linux/ext2_fs.h | |
13 | * | |
14 | * Copyright (C) 1992, 1993, 1994, 1995 | |
15 | * Remy Card (card@masi.ibp.fr) | |
16 | * Laboratoire MASI - Institut Blaise Pascal | |
17 | * Universite Pierre et Marie Curie (Paris VI) | |
18 | * | |
19 | * from | |
20 | * | |
21 | * linux/include/linux/minix_fs.h | |
22 | * | |
23 | * Copyright (C) 1991, 1992 Linus Torvalds | |
24 | */ | |
25 | ||
e63e88bc RK |
26 | #ifndef _LINUX_NILFS2_ONDISK_H |
27 | #define _LINUX_NILFS2_ONDISK_H | |
eed10e39 KS |
28 | |
29 | #include <linux/types.h> | |
4d3cf1bc | 30 | #include <linux/magic.h> |
eed10e39 | 31 | |
eed10e39 KS |
32 | |
33 | #define NILFS_INODE_BMAP_SIZE 7 | |
e63e88bc | 34 | |
eed10e39 KS |
35 | /** |
36 | * struct nilfs_inode - structure of an inode on disk | |
37 | * @i_blocks: blocks count | |
38 | * @i_size: size in bytes | |
61239230 RK |
39 | * @i_ctime: creation time (seconds) |
40 | * @i_mtime: modification time (seconds) | |
41 | * @i_ctime_nsec: creation time (nano seconds) | |
42 | * @i_mtime_nsec: modification time (nano seconds) | |
eed10e39 KS |
43 | * @i_uid: user id |
44 | * @i_gid: group id | |
45 | * @i_mode: file mode | |
46 | * @i_links_count: links count | |
47 | * @i_flags: file flags | |
48 | * @i_bmap: block mapping | |
49 | * @i_xattr: extended attributes | |
50 | * @i_generation: file generation (for NFS) | |
e63e88bc | 51 | * @i_pad: padding |
eed10e39 KS |
52 | */ |
53 | struct nilfs_inode { | |
54 | __le64 i_blocks; | |
55 | __le64 i_size; | |
56 | __le64 i_ctime; | |
57 | __le64 i_mtime; | |
61239230 RK |
58 | __le32 i_ctime_nsec; |
59 | __le32 i_mtime_nsec; | |
eed10e39 KS |
60 | __le32 i_uid; |
61 | __le32 i_gid; | |
62 | __le16 i_mode; | |
63 | __le16 i_links_count; | |
64 | __le32 i_flags; | |
65 | __le64 i_bmap[NILFS_INODE_BMAP_SIZE]; | |
66 | #define i_device_code i_bmap[0] | |
67 | __le64 i_xattr; | |
68 | __le32 i_generation; | |
69 | __le32 i_pad; | |
70 | }; | |
71 | ||
0ec060d1 RK |
72 | #define NILFS_MIN_INODE_SIZE 128 |
73 | ||
eed10e39 KS |
74 | /** |
75 | * struct nilfs_super_root - structure of super root | |
76 | * @sr_sum: check sum | |
77 | * @sr_bytes: byte count of the structure | |
78 | * @sr_flags: flags (reserved) | |
79 | * @sr_nongc_ctime: write time of the last segment not for cleaner operation | |
80 | * @sr_dat: DAT file inode | |
81 | * @sr_cpfile: checkpoint file inode | |
82 | * @sr_sufile: segment usage file inode | |
83 | */ | |
84 | struct nilfs_super_root { | |
85 | __le32 sr_sum; | |
86 | __le16 sr_bytes; | |
87 | __le16 sr_flags; | |
88 | __le64 sr_nongc_ctime; | |
89 | struct nilfs_inode sr_dat; | |
90 | struct nilfs_inode sr_cpfile; | |
91 | struct nilfs_inode sr_sufile; | |
92 | }; | |
93 | ||
94 | #define NILFS_SR_MDT_OFFSET(inode_size, i) \ | |
95 | ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \ | |
96 | (inode_size) * (i)) | |
97 | #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0) | |
98 | #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1) | |
99 | #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2) | |
6c6de1aa | 100 | #define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3) |
eed10e39 KS |
101 | |
102 | /* | |
103 | * Maximal mount counts | |
104 | */ | |
105 | #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */ | |
106 | ||
107 | /* | |
108 | * File system states (sbp->s_state, nilfs->ns_mount_state) | |
109 | */ | |
110 | #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */ | |
111 | #define NILFS_ERROR_FS 0x0002 /* Errors detected */ | |
112 | #define NILFS_RESIZE_FS 0x0004 /* Resize required */ | |
113 | ||
114 | /* | |
115 | * Mount flags (sbi->s_mount_opt) | |
116 | */ | |
117 | #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */ | |
118 | #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ | |
119 | #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ | |
120 | #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ | |
eed10e39 | 121 | #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ |
076a378b RK |
122 | #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* |
123 | * Apply strict in-order | |
124 | * semantics also for data | |
125 | */ | |
126 | #define NILFS_MOUNT_NORECOVERY 0x4000 /* | |
127 | * Disable write access during | |
128 | * mount-time recovery | |
129 | */ | |
e902ec99 | 130 | #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */ |
eed10e39 KS |
131 | |
132 | ||
133 | /** | |
134 | * struct nilfs_super_block - structure of super block on disk | |
135 | */ | |
136 | struct nilfs_super_block { | |
2f1b7cd2 | 137 | /*00*/ __le32 s_rev_level; /* Revision level */ |
eed10e39 KS |
138 | __le16 s_minor_rev_level; /* minor revision level */ |
139 | __le16 s_magic; /* Magic signature */ | |
140 | ||
076a378b RK |
141 | __le16 s_bytes; /* |
142 | * Bytes count of CRC calculation | |
143 | * for this structure. s_reserved | |
144 | * is excluded. | |
145 | */ | |
eed10e39 KS |
146 | __le16 s_flags; /* flags */ |
147 | __le32 s_crc_seed; /* Seed value of CRC calculation */ | |
2f1b7cd2 | 148 | /*10*/ __le32 s_sum; /* Check sum of super block */ |
eed10e39 | 149 | |
076a378b RK |
150 | __le32 s_log_block_size; /* |
151 | * Block size represented as follows | |
152 | * blocksize = | |
153 | * 1 << (s_log_block_size + 10) | |
154 | */ | |
eed10e39 | 155 | __le64 s_nsegments; /* Number of segments in filesystem */ |
2f1b7cd2 | 156 | /*20*/ __le64 s_dev_size; /* block device size in bytes */ |
eed10e39 | 157 | __le64 s_first_data_block; /* 1st seg disk block number */ |
2f1b7cd2 | 158 | /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */ |
eed10e39 KS |
159 | __le32 s_r_segments_percentage; /* Reserved segments percentage */ |
160 | ||
161 | __le64 s_last_cno; /* Last checkpoint number */ | |
2f1b7cd2 | 162 | /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */ |
eed10e39 | 163 | __le64 s_last_seq; /* seq. number of seg written last */ |
2f1b7cd2 | 164 | /*50*/ __le64 s_free_blocks_count; /* Free blocks count */ |
eed10e39 | 165 | |
076a378b RK |
166 | __le64 s_ctime; /* |
167 | * Creation time (execution time of | |
168 | * newfs) | |
169 | */ | |
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 */ |
076a378b RK |
193 | __le32 s_c_block_max; /* |
194 | * Threshold of data amount for | |
195 | * the segment construction | |
196 | */ | |
1a80a176 RK |
197 | /*100*/ __le64 s_feature_compat; /* Compatible feature set */ |
198 | __le64 s_feature_compat_ro; /* Read-only compatible feature set */ | |
199 | __le64 s_feature_incompat; /* Incompatible feature set */ | |
200 | __u32 s_reserved[186]; /* padding to the end of the block */ | |
eed10e39 KS |
201 | }; |
202 | ||
203 | /* | |
204 | * Codes for operating systems | |
205 | */ | |
206 | #define NILFS_OS_LINUX 0 | |
207 | /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ | |
208 | ||
209 | /* | |
210 | * Revision levels | |
211 | */ | |
212 | #define NILFS_CURRENT_REV 2 /* current major revision */ | |
213 | #define NILFS_MINOR_REV 0 /* minor revision */ | |
9566a7a8 | 214 | #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */ |
eed10e39 | 215 | |
1a80a176 RK |
216 | /* |
217 | * Feature set definitions | |
218 | * | |
219 | * If there is a bit set in the incompatible feature set that the kernel | |
220 | * doesn't know about, it should refuse to mount the filesystem. | |
221 | */ | |
be667377 RK |
222 | #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL |
223 | ||
1a80a176 | 224 | #define NILFS_FEATURE_COMPAT_SUPP 0ULL |
be667377 | 225 | #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT |
1a80a176 RK |
226 | #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL |
227 | ||
eed10e39 KS |
228 | /* |
229 | * Bytes count of super_block for CRC-calculation | |
230 | */ | |
231 | #define NILFS_SB_BYTES \ | |
232 | ((long)&((struct nilfs_super_block *)0)->s_reserved) | |
233 | ||
234 | /* | |
235 | * Special inode number | |
236 | */ | |
237 | #define NILFS_ROOT_INO 2 /* Root file inode */ | |
238 | #define NILFS_DAT_INO 3 /* DAT file */ | |
239 | #define NILFS_CPFILE_INO 4 /* checkpoint file */ | |
240 | #define NILFS_SUFILE_INO 5 /* segment usage file */ | |
241 | #define NILFS_IFILE_INO 6 /* ifile */ | |
242 | #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ | |
243 | #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ | |
244 | #define NILFS_SKETCH_INO 10 /* Sketch file */ | |
245 | #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ | |
246 | ||
247 | #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ | |
eed10e39 | 248 | |
076a378b RK |
249 | #define NILFS_SEG_MIN_BLOCKS 16 /* |
250 | * Minimum number of blocks in | |
251 | * a full segment | |
252 | */ | |
253 | #define NILFS_PSEG_MIN_BLOCKS 2 /* | |
254 | * Minimum number of blocks in | |
255 | * a partial segment | |
256 | */ | |
257 | #define NILFS_MIN_NRSVSEGS 8 /* | |
258 | * Minimum number of reserved | |
259 | * segments | |
260 | */ | |
eed10e39 | 261 | |
6c43f410 RK |
262 | /* |
263 | * We call DAT, cpfile, and sufile root metadata files. Inodes of | |
264 | * these files are written in super root block instead of ifile, and | |
265 | * garbage collector doesn't keep any past versions of these files. | |
266 | */ | |
267 | #define NILFS_ROOT_METADATA_FILE(ino) \ | |
268 | ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO) | |
269 | ||
e339ad31 RK |
270 | /* |
271 | * bytes offset of secondary super block | |
272 | */ | |
273 | #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) | |
eed10e39 KS |
274 | |
275 | /* | |
276 | * Maximal count of links to a file | |
277 | */ | |
278 | #define NILFS_LINK_MAX 32000 | |
279 | ||
280 | /* | |
281 | * Structure of a directory entry | |
282 | * (Same as ext2) | |
283 | */ | |
284 | ||
285 | #define NILFS_NAME_LEN 255 | |
286 | ||
89c0fd01 RK |
287 | /* |
288 | * Block size limitations | |
289 | */ | |
290 | #define NILFS_MIN_BLOCK_SIZE 1024 | |
291 | #define NILFS_MAX_BLOCK_SIZE 65536 | |
292 | ||
eed10e39 KS |
293 | /* |
294 | * The new version of the directory entry. Since V0 structures are | |
295 | * stored in intel byte order, and the name_len field could never be | |
296 | * bigger than 255 chars, it's safe to reclaim the extra byte for the | |
297 | * file_type field. | |
298 | */ | |
299 | struct nilfs_dir_entry { | |
300 | __le64 inode; /* Inode number */ | |
301 | __le16 rec_len; /* Directory entry length */ | |
302 | __u8 name_len; /* Name length */ | |
8c74ac05 | 303 | __u8 file_type; /* Dir entry type (file, dir, etc) */ |
eed10e39 KS |
304 | char name[NILFS_NAME_LEN]; /* File name */ |
305 | char pad; | |
306 | }; | |
307 | ||
308 | /* | |
309 | * NILFS directory file types. Only the low 3 bits are used. The | |
310 | * other bits are reserved for now. | |
311 | */ | |
312 | enum { | |
313 | NILFS_FT_UNKNOWN, | |
314 | NILFS_FT_REG_FILE, | |
315 | NILFS_FT_DIR, | |
316 | NILFS_FT_CHRDEV, | |
317 | NILFS_FT_BLKDEV, | |
318 | NILFS_FT_FIFO, | |
319 | NILFS_FT_SOCK, | |
320 | NILFS_FT_SYMLINK, | |
321 | NILFS_FT_MAX | |
322 | }; | |
323 | ||
324 | /* | |
325 | * NILFS_DIR_PAD defines the directory entries boundaries | |
326 | * | |
327 | * NOTE: It must be a multiple of 8 | |
328 | */ | |
329 | #define NILFS_DIR_PAD 8 | |
330 | #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) | |
331 | #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ | |
332 | ~NILFS_DIR_ROUND) | |
e63e88bc | 333 | #define NILFS_MAX_REC_LEN ((1 << 16) - 1) |
eed10e39 KS |
334 | |
335 | /** | |
336 | * struct nilfs_finfo - file information | |
337 | * @fi_ino: inode number | |
338 | * @fi_cno: checkpoint number | |
339 | * @fi_nblocks: number of blocks (including intermediate blocks) | |
340 | * @fi_ndatablk: number of file data blocks | |
341 | */ | |
342 | struct nilfs_finfo { | |
343 | __le64 fi_ino; | |
344 | __le64 fi_cno; | |
345 | __le32 fi_nblocks; | |
346 | __le32 fi_ndatablk; | |
eed10e39 KS |
347 | }; |
348 | ||
349 | /** | |
e63e88bc | 350 | * struct nilfs_binfo_v - information on a data block (except DAT) |
eed10e39 KS |
351 | * @bi_vblocknr: virtual block number |
352 | * @bi_blkoff: block offset | |
353 | */ | |
354 | struct nilfs_binfo_v { | |
355 | __le64 bi_vblocknr; | |
356 | __le64 bi_blkoff; | |
357 | }; | |
358 | ||
359 | /** | |
e63e88bc | 360 | * struct nilfs_binfo_dat - information on a DAT node block |
eed10e39 KS |
361 | * @bi_blkoff: block offset |
362 | * @bi_level: level | |
363 | * @bi_pad: padding | |
364 | */ | |
365 | struct nilfs_binfo_dat { | |
366 | __le64 bi_blkoff; | |
367 | __u8 bi_level; | |
368 | __u8 bi_pad[7]; | |
369 | }; | |
370 | ||
371 | /** | |
372 | * union nilfs_binfo: block information | |
373 | * @bi_v: nilfs_binfo_v structure | |
374 | * @bi_dat: nilfs_binfo_dat structure | |
375 | */ | |
376 | union nilfs_binfo { | |
377 | struct nilfs_binfo_v bi_v; | |
378 | struct nilfs_binfo_dat bi_dat; | |
379 | }; | |
380 | ||
381 | /** | |
8c74ac05 | 382 | * struct nilfs_segment_summary - segment summary header |
eed10e39 KS |
383 | * @ss_datasum: checksum of data |
384 | * @ss_sumsum: checksum of segment summary | |
385 | * @ss_magic: magic number | |
386 | * @ss_bytes: size of this structure in bytes | |
387 | * @ss_flags: flags | |
388 | * @ss_seq: sequence number | |
389 | * @ss_create: creation timestamp | |
390 | * @ss_next: next segment | |
391 | * @ss_nblocks: number of blocks | |
392 | * @ss_nfinfo: number of finfo structures | |
393 | * @ss_sumbytes: total size of segment summary in bytes | |
394 | * @ss_pad: padding | |
50614bcf | 395 | * @ss_cno: checkpoint number |
eed10e39 KS |
396 | */ |
397 | struct nilfs_segment_summary { | |
398 | __le32 ss_datasum; | |
399 | __le32 ss_sumsum; | |
400 | __le32 ss_magic; | |
401 | __le16 ss_bytes; | |
402 | __le16 ss_flags; | |
403 | __le64 ss_seq; | |
404 | __le64 ss_create; | |
405 | __le64 ss_next; | |
406 | __le32 ss_nblocks; | |
407 | __le32 ss_nfinfo; | |
408 | __le32 ss_sumbytes; | |
409 | __le32 ss_pad; | |
50614bcf | 410 | __le64 ss_cno; |
eed10e39 KS |
411 | /* array of finfo structures */ |
412 | }; | |
413 | ||
414 | #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ | |
415 | ||
416 | /* | |
417 | * Segment summary flags | |
418 | */ | |
419 | #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ | |
420 | #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ | |
421 | #define NILFS_SS_SR 0x0004 /* has super root */ | |
422 | #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ | |
423 | #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ | |
424 | ||
6600b9dd | 425 | /** |
e63e88bc | 426 | * struct nilfs_btree_node - header of B-tree node block |
6600b9dd JS |
427 | * @bn_flags: flags |
428 | * @bn_level: level | |
429 | * @bn_nchildren: number of children | |
430 | * @bn_pad: padding | |
431 | */ | |
432 | struct nilfs_btree_node { | |
433 | __u8 bn_flags; | |
434 | __u8 bn_level; | |
435 | __le16 bn_nchildren; | |
436 | __le32 bn_pad; | |
437 | }; | |
438 | ||
439 | /* flags */ | |
440 | #define NILFS_BTREE_NODE_ROOT 0x01 | |
441 | ||
442 | /* level */ | |
443 | #define NILFS_BTREE_LEVEL_DATA 0 | |
444 | #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) | |
d8fd150f | 445 | #define NILFS_BTREE_LEVEL_MAX 14 /* Max level (exclusive) */ |
6600b9dd | 446 | |
e63e88bc RK |
447 | /** |
448 | * struct nilfs_direct_node - header of built-in bmap array | |
449 | * @dn_flags: flags | |
450 | * @dn_pad: padding | |
451 | */ | |
452 | struct nilfs_direct_node { | |
453 | __u8 dn_flags; | |
454 | __u8 pad[7]; | |
455 | }; | |
456 | ||
eed10e39 KS |
457 | /** |
458 | * struct nilfs_palloc_group_desc - block group descriptor | |
459 | * @pg_nfrees: number of free entries in block group | |
460 | */ | |
461 | struct nilfs_palloc_group_desc { | |
462 | __le32 pg_nfrees; | |
463 | }; | |
464 | ||
465 | /** | |
466 | * struct nilfs_dat_entry - disk address translation entry | |
37e11f33 QF |
467 | * @de_blocknr: block number |
468 | * @de_start: start checkpoint number | |
469 | * @de_end: end checkpoint number | |
470 | * @de_rsv: reserved for future use | |
eed10e39 KS |
471 | */ |
472 | struct nilfs_dat_entry { | |
473 | __le64 de_blocknr; | |
474 | __le64 de_start; | |
475 | __le64 de_end; | |
476 | __le64 de_rsv; | |
477 | }; | |
478 | ||
0ec060d1 RK |
479 | #define NILFS_MIN_DAT_ENTRY_SIZE 32 |
480 | ||
eed10e39 KS |
481 | /** |
482 | * struct nilfs_snapshot_list - snapshot list | |
483 | * @ssl_next: next checkpoint number on snapshot list | |
484 | * @ssl_prev: previous checkpoint number on snapshot list | |
485 | */ | |
486 | struct nilfs_snapshot_list { | |
487 | __le64 ssl_next; | |
488 | __le64 ssl_prev; | |
489 | }; | |
490 | ||
491 | /** | |
492 | * struct nilfs_checkpoint - checkpoint structure | |
493 | * @cp_flags: flags | |
494 | * @cp_checkpoints_count: checkpoints count in a block | |
495 | * @cp_snapshot_list: snapshot list | |
496 | * @cp_cno: checkpoint number | |
497 | * @cp_create: creation timestamp | |
498 | * @cp_nblk_inc: number of blocks incremented by this checkpoint | |
499 | * @cp_inodes_count: inodes count | |
500 | * @cp_blocks_count: blocks count | |
501 | * @cp_ifile_inode: inode of ifile | |
502 | */ | |
503 | struct nilfs_checkpoint { | |
504 | __le32 cp_flags; | |
505 | __le32 cp_checkpoints_count; | |
506 | struct nilfs_snapshot_list cp_snapshot_list; | |
507 | __le64 cp_cno; | |
508 | __le64 cp_create; | |
509 | __le64 cp_nblk_inc; | |
510 | __le64 cp_inodes_count; | |
be667377 | 511 | __le64 cp_blocks_count; |
eed10e39 | 512 | |
076a378b RK |
513 | /* |
514 | * Do not change the byte offset of ifile inode. | |
515 | * To keep the compatibility of the disk format, | |
516 | * additional fields should be added behind cp_ifile_inode. | |
517 | */ | |
eed10e39 KS |
518 | struct nilfs_inode cp_ifile_inode; |
519 | }; | |
520 | ||
0ec060d1 RK |
521 | #define NILFS_MIN_CHECKPOINT_SIZE (64 + NILFS_MIN_INODE_SIZE) |
522 | ||
eed10e39 KS |
523 | /* checkpoint flags */ |
524 | enum { | |
525 | NILFS_CHECKPOINT_SNAPSHOT, | |
526 | NILFS_CHECKPOINT_INVALID, | |
527 | NILFS_CHECKPOINT_SKETCH, | |
c96fa464 | 528 | NILFS_CHECKPOINT_MINOR, |
eed10e39 KS |
529 | }; |
530 | ||
531 | #define NILFS_CHECKPOINT_FNS(flag, name) \ | |
532 | static inline void \ | |
533 | nilfs_checkpoint_set_##name(struct nilfs_checkpoint *cp) \ | |
534 | { \ | |
535 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) | \ | |
536 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
537 | } \ | |
538 | static inline void \ | |
539 | nilfs_checkpoint_clear_##name(struct nilfs_checkpoint *cp) \ | |
540 | { \ | |
541 | cp->cp_flags = cpu_to_le32(le32_to_cpu(cp->cp_flags) & \ | |
542 | ~(1UL << NILFS_CHECKPOINT_##flag)); \ | |
543 | } \ | |
544 | static inline int \ | |
545 | nilfs_checkpoint_##name(const struct nilfs_checkpoint *cp) \ | |
546 | { \ | |
547 | return !!(le32_to_cpu(cp->cp_flags) & \ | |
548 | (1UL << NILFS_CHECKPOINT_##flag)); \ | |
549 | } | |
550 | ||
551 | NILFS_CHECKPOINT_FNS(SNAPSHOT, snapshot) | |
552 | NILFS_CHECKPOINT_FNS(INVALID, invalid) | |
c96fa464 | 553 | NILFS_CHECKPOINT_FNS(MINOR, minor) |
eed10e39 | 554 | |
eed10e39 KS |
555 | /** |
556 | * struct nilfs_cpfile_header - checkpoint file header | |
557 | * @ch_ncheckpoints: number of checkpoints | |
558 | * @ch_nsnapshots: number of snapshots | |
559 | * @ch_snapshot_list: snapshot list | |
560 | */ | |
561 | struct nilfs_cpfile_header { | |
562 | __le64 ch_ncheckpoints; | |
563 | __le64 ch_nsnapshots; | |
564 | struct nilfs_snapshot_list ch_snapshot_list; | |
565 | }; | |
566 | ||
e63e88bc | 567 | #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ |
eed10e39 KS |
568 | ((sizeof(struct nilfs_cpfile_header) + \ |
569 | sizeof(struct nilfs_checkpoint) - 1) / \ | |
570 | sizeof(struct nilfs_checkpoint)) | |
571 | ||
572 | /** | |
573 | * struct nilfs_segment_usage - segment usage | |
574 | * @su_lastmod: last modified timestamp | |
575 | * @su_nblocks: number of blocks in segment | |
576 | * @su_flags: flags | |
577 | */ | |
578 | struct nilfs_segment_usage { | |
579 | __le64 su_lastmod; | |
580 | __le32 su_nblocks; | |
581 | __le32 su_flags; | |
582 | }; | |
583 | ||
0ec060d1 RK |
584 | #define NILFS_MIN_SEGMENT_USAGE_SIZE 16 |
585 | ||
eed10e39 KS |
586 | /* segment usage flag */ |
587 | enum { | |
588 | NILFS_SEGMENT_USAGE_ACTIVE, | |
589 | NILFS_SEGMENT_USAGE_DIRTY, | |
590 | NILFS_SEGMENT_USAGE_ERROR, | |
eed10e39 KS |
591 | }; |
592 | ||
593 | #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ | |
594 | static inline void \ | |
595 | nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ | |
596 | { \ | |
597 | su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \ | |
598 | (1UL << NILFS_SEGMENT_USAGE_##flag));\ | |
599 | } \ | |
600 | static inline void \ | |
601 | nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ | |
602 | { \ | |
603 | su->su_flags = \ | |
604 | cpu_to_le32(le32_to_cpu(su->su_flags) & \ | |
605 | ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
606 | } \ | |
607 | static inline int \ | |
608 | nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ | |
609 | { \ | |
610 | return !!(le32_to_cpu(su->su_flags) & \ | |
611 | (1UL << NILFS_SEGMENT_USAGE_##flag)); \ | |
612 | } | |
613 | ||
614 | NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) | |
615 | NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) | |
616 | NILFS_SEGMENT_USAGE_FNS(ERROR, error) | |
eed10e39 KS |
617 | |
618 | static inline void | |
619 | nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) | |
620 | { | |
621 | su->su_lastmod = cpu_to_le64(0); | |
622 | su->su_nblocks = cpu_to_le32(0); | |
623 | su->su_flags = cpu_to_le32(0); | |
624 | } | |
625 | ||
626 | static inline int | |
627 | nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) | |
628 | { | |
629 | return !le32_to_cpu(su->su_flags); | |
630 | } | |
631 | ||
632 | /** | |
633 | * struct nilfs_sufile_header - segment usage file header | |
634 | * @sh_ncleansegs: number of clean segments | |
635 | * @sh_ndirtysegs: number of dirty segments | |
636 | * @sh_last_alloc: last allocated segment number | |
637 | */ | |
638 | struct nilfs_sufile_header { | |
639 | __le64 sh_ncleansegs; | |
640 | __le64 sh_ndirtysegs; | |
641 | __le64 sh_last_alloc; | |
642 | /* ... */ | |
643 | }; | |
644 | ||
e63e88bc | 645 | #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ |
eed10e39 KS |
646 | ((sizeof(struct nilfs_sufile_header) + \ |
647 | sizeof(struct nilfs_segment_usage) - 1) / \ | |
648 | sizeof(struct nilfs_segment_usage)) | |
649 | ||
e63e88bc | 650 | #endif /* _LINUX_NILFS2_ONDISK_H */ |