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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 |
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 |
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 |
14 | * GNU Lesser General Public License for more details. |
15 | * |
16 | * You should have received a copy of the GNU Lesser General Public License |
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 | #include <linux/magic.h> |
44 | #include <linux/bug.h> |
45 | |
46 | |
47 | #define NILFS_INODE_BMAP_SIZE 7 |
48 | /** |
49 | * struct nilfs_inode - structure of an inode on disk |
50 | * @i_blocks: blocks count |
51 | * @i_size: size in bytes |
52 | * @i_ctime: creation time (seconds) |
53 | * @i_mtime: modification time (seconds) |
54 | * @i_ctime_nsec: creation time (nano seconds) |
55 | * @i_mtime_nsec: modification time (nano seconds) |
56 | * @i_uid: user id |
57 | * @i_gid: group id |
58 | * @i_mode: file mode |
59 | * @i_links_count: links count |
60 | * @i_flags: file flags |
61 | * @i_bmap: block mapping |
62 | * @i_xattr: extended attributes |
63 | * @i_generation: file generation (for NFS) |
64 | * @i_pad: padding |
65 | */ |
66 | struct nilfs_inode { |
67 | __le64 i_blocks; |
68 | __le64 i_size; |
69 | __le64 i_ctime; |
70 | __le64 i_mtime; |
71 | __le32 i_ctime_nsec; |
72 | __le32 i_mtime_nsec; |
73 | __le32 i_uid; |
74 | __le32 i_gid; |
75 | __le16 i_mode; |
76 | __le16 i_links_count; |
77 | __le32 i_flags; |
78 | __le64 i_bmap[NILFS_INODE_BMAP_SIZE]; |
79 | #define i_device_code i_bmap[0] |
80 | __le64 i_xattr; |
81 | __le32 i_generation; |
82 | __le32 i_pad; |
83 | }; |
84 | |
85 | /** |
86 | * struct nilfs_super_root - structure of super root |
87 | * @sr_sum: check sum |
88 | * @sr_bytes: byte count of the structure |
89 | * @sr_flags: flags (reserved) |
90 | * @sr_nongc_ctime: write time of the last segment not for cleaner operation |
91 | * @sr_dat: DAT file inode |
92 | * @sr_cpfile: checkpoint file inode |
93 | * @sr_sufile: segment usage file inode |
94 | */ |
95 | struct nilfs_super_root { |
96 | __le32 sr_sum; |
97 | __le16 sr_bytes; |
98 | __le16 sr_flags; |
99 | __le64 sr_nongc_ctime; |
100 | struct nilfs_inode sr_dat; |
101 | struct nilfs_inode sr_cpfile; |
102 | struct nilfs_inode sr_sufile; |
103 | }; |
104 | |
105 | #define NILFS_SR_MDT_OFFSET(inode_size, i) \ |
106 | ((unsigned long)&((struct nilfs_super_root *)0)->sr_dat + \ |
107 | (inode_size) * (i)) |
108 | #define NILFS_SR_DAT_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 0) |
109 | #define NILFS_SR_CPFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 1) |
110 | #define NILFS_SR_SUFILE_OFFSET(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 2) |
111 | #define NILFS_SR_BYTES(inode_size) NILFS_SR_MDT_OFFSET(inode_size, 3) |
112 | |
113 | /* |
114 | * Maximal mount counts |
115 | */ |
116 | #define NILFS_DFL_MAX_MNT_COUNT 50 /* 50 mounts */ |
117 | |
118 | /* |
119 | * File system states (sbp->s_state, nilfs->ns_mount_state) |
120 | */ |
121 | #define NILFS_VALID_FS 0x0001 /* Unmounted cleanly */ |
122 | #define NILFS_ERROR_FS 0x0002 /* Errors detected */ |
123 | #define NILFS_RESIZE_FS 0x0004 /* Resize required */ |
124 | |
125 | /* |
126 | * Mount flags (sbi->s_mount_opt) |
127 | */ |
128 | #define NILFS_MOUNT_ERROR_MODE 0x0070 /* Error mode mask */ |
129 | #define NILFS_MOUNT_ERRORS_CONT 0x0010 /* Continue on errors */ |
130 | #define NILFS_MOUNT_ERRORS_RO 0x0020 /* Remount fs ro on errors */ |
131 | #define NILFS_MOUNT_ERRORS_PANIC 0x0040 /* Panic on errors */ |
132 | #define NILFS_MOUNT_BARRIER 0x1000 /* Use block barriers */ |
133 | #define NILFS_MOUNT_STRICT_ORDER 0x2000 /* Apply strict in-order |
134 | semantics also for data */ |
135 | #define NILFS_MOUNT_NORECOVERY 0x4000 /* Disable write access during |
136 | mount-time recovery */ |
137 | #define NILFS_MOUNT_DISCARD 0x8000 /* Issue DISCARD requests */ |
138 | |
139 | |
140 | /** |
141 | * struct nilfs_super_block - structure of super block on disk |
142 | */ |
143 | struct nilfs_super_block { |
144 | /*00*/ __le32 s_rev_level; /* Revision level */ |
145 | __le16 s_minor_rev_level; /* minor revision level */ |
146 | __le16 s_magic; /* Magic signature */ |
147 | |
148 | __le16 s_bytes; /* Bytes count of CRC calculation |
149 | for this structure. s_reserved |
150 | is excluded. */ |
151 | __le16 s_flags; /* flags */ |
152 | __le32 s_crc_seed; /* Seed value of CRC calculation */ |
153 | /*10*/ __le32 s_sum; /* Check sum of super block */ |
154 | |
155 | __le32 s_log_block_size; /* Block size represented as follows |
156 | blocksize = |
157 | 1 << (s_log_block_size + 10) */ |
158 | __le64 s_nsegments; /* Number of segments in filesystem */ |
159 | /*20*/ __le64 s_dev_size; /* block device size in bytes */ |
160 | __le64 s_first_data_block; /* 1st seg disk block number */ |
161 | /*30*/ __le32 s_blocks_per_segment; /* number of blocks per full segment */ |
162 | __le32 s_r_segments_percentage; /* Reserved segments percentage */ |
163 | |
164 | __le64 s_last_cno; /* Last checkpoint number */ |
165 | /*40*/ __le64 s_last_pseg; /* disk block addr pseg written last */ |
166 | __le64 s_last_seq; /* seq. number of seg written last */ |
167 | /*50*/ __le64 s_free_blocks_count; /* Free blocks count */ |
168 | |
169 | __le64 s_ctime; /* Creation time (execution time of |
170 | newfs) */ |
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; /* Threshold of data amount for |
195 | the segment construction */ |
196 | /*100*/ __le64 s_feature_compat; /* Compatible feature set */ |
197 | __le64 s_feature_compat_ro; /* Read-only compatible feature set */ |
198 | __le64 s_feature_incompat; /* Incompatible feature set */ |
199 | __u32 s_reserved[186]; /* padding to the end of the block */ |
200 | }; |
201 | |
202 | /* |
203 | * Codes for operating systems |
204 | */ |
205 | #define NILFS_OS_LINUX 0 |
206 | /* Codes from 1 to 4 are reserved to keep compatibility with ext2 creator-OS */ |
207 | |
208 | /* |
209 | * Revision levels |
210 | */ |
211 | #define NILFS_CURRENT_REV 2 /* current major revision */ |
212 | #define NILFS_MINOR_REV 0 /* minor revision */ |
213 | #define NILFS_MIN_SUPP_REV 2 /* minimum supported revision */ |
214 | |
215 | /* |
216 | * Feature set definitions |
217 | * |
218 | * If there is a bit set in the incompatible feature set that the kernel |
219 | * doesn't know about, it should refuse to mount the filesystem. |
220 | */ |
221 | #define NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT 0x00000001ULL |
222 | |
223 | #define NILFS_FEATURE_COMPAT_SUPP 0ULL |
224 | #define NILFS_FEATURE_COMPAT_RO_SUPP NILFS_FEATURE_COMPAT_RO_BLOCK_COUNT |
225 | #define NILFS_FEATURE_INCOMPAT_SUPP 0ULL |
226 | |
227 | /* |
228 | * Bytes count of super_block for CRC-calculation |
229 | */ |
230 | #define NILFS_SB_BYTES \ |
231 | ((long)&((struct nilfs_super_block *)0)->s_reserved) |
232 | |
233 | /* |
234 | * Special inode number |
235 | */ |
236 | #define NILFS_ROOT_INO 2 /* Root file inode */ |
237 | #define NILFS_DAT_INO 3 /* DAT file */ |
238 | #define NILFS_CPFILE_INO 4 /* checkpoint file */ |
239 | #define NILFS_SUFILE_INO 5 /* segment usage file */ |
240 | #define NILFS_IFILE_INO 6 /* ifile */ |
241 | #define NILFS_ATIME_INO 7 /* Atime file (reserved) */ |
242 | #define NILFS_XATTR_INO 8 /* Xattribute file (reserved) */ |
243 | #define NILFS_SKETCH_INO 10 /* Sketch file */ |
244 | #define NILFS_USER_INO 11 /* Fisrt user's file inode number */ |
245 | |
246 | #define NILFS_SB_OFFSET_BYTES 1024 /* byte offset of nilfs superblock */ |
247 | |
248 | #define NILFS_SEG_MIN_BLOCKS 16 /* Minimum number of blocks in |
249 | a full segment */ |
250 | #define NILFS_PSEG_MIN_BLOCKS 2 /* Minimum number of blocks in |
251 | a partial segment */ |
252 | #define NILFS_MIN_NRSVSEGS 8 /* Minimum number of reserved |
253 | segments */ |
254 | |
255 | /* |
256 | * We call DAT, cpfile, and sufile root metadata files. Inodes of |
257 | * these files are written in super root block instead of ifile, and |
258 | * garbage collector doesn't keep any past versions of these files. |
259 | */ |
260 | #define NILFS_ROOT_METADATA_FILE(ino) \ |
261 | ((ino) >= NILFS_DAT_INO && (ino) <= NILFS_SUFILE_INO) |
262 | |
263 | /* |
264 | * bytes offset of secondary super block |
265 | */ |
266 | #define NILFS_SB2_OFFSET_BYTES(devsize) ((((devsize) >> 12) - 1) << 12) |
267 | |
268 | /* |
269 | * Maximal count of links to a file |
270 | */ |
271 | #define NILFS_LINK_MAX 32000 |
272 | |
273 | /* |
274 | * Structure of a directory entry |
275 | * (Same as ext2) |
276 | */ |
277 | |
278 | #define NILFS_NAME_LEN 255 |
279 | |
280 | /* |
281 | * Block size limitations |
282 | */ |
283 | #define NILFS_MIN_BLOCK_SIZE 1024 |
284 | #define NILFS_MAX_BLOCK_SIZE 65536 |
285 | |
286 | /* |
287 | * The new version of the directory entry. Since V0 structures are |
288 | * stored in intel byte order, and the name_len field could never be |
289 | * bigger than 255 chars, it's safe to reclaim the extra byte for the |
290 | * file_type field. |
291 | */ |
292 | struct nilfs_dir_entry { |
293 | __le64 inode; /* Inode number */ |
294 | __le16 rec_len; /* Directory entry length */ |
295 | __u8 name_len; /* Name length */ |
296 | __u8 file_type; /* Dir entry type (file, dir, etc) */ |
297 | char name[NILFS_NAME_LEN]; /* File name */ |
298 | char pad; |
299 | }; |
300 | |
301 | /* |
302 | * NILFS directory file types. Only the low 3 bits are used. The |
303 | * other bits are reserved for now. |
304 | */ |
305 | enum { |
306 | NILFS_FT_UNKNOWN, |
307 | NILFS_FT_REG_FILE, |
308 | NILFS_FT_DIR, |
309 | NILFS_FT_CHRDEV, |
310 | NILFS_FT_BLKDEV, |
311 | NILFS_FT_FIFO, |
312 | NILFS_FT_SOCK, |
313 | NILFS_FT_SYMLINK, |
314 | NILFS_FT_MAX |
315 | }; |
316 | |
317 | /* |
318 | * NILFS_DIR_PAD defines the directory entries boundaries |
319 | * |
320 | * NOTE: It must be a multiple of 8 |
321 | */ |
322 | #define NILFS_DIR_PAD 8 |
323 | #define NILFS_DIR_ROUND (NILFS_DIR_PAD - 1) |
324 | #define NILFS_DIR_REC_LEN(name_len) (((name_len) + 12 + NILFS_DIR_ROUND) & \ |
325 | ~NILFS_DIR_ROUND) |
326 | #define NILFS_MAX_REC_LEN ((1<<16)-1) |
327 | |
328 | static inline unsigned nilfs_rec_len_from_disk(__le16 dlen) |
329 | { |
330 | unsigned len = le16_to_cpu(dlen); |
331 | |
332 | #if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536) |
333 | if (len == NILFS_MAX_REC_LEN) |
334 | return 1 << 16; |
335 | #endif |
336 | return len; |
337 | } |
338 | |
339 | static inline __le16 nilfs_rec_len_to_disk(unsigned len) |
340 | { |
341 | #if !defined(__KERNEL__) || (PAGE_CACHE_SIZE >= 65536) |
342 | if (len == (1 << 16)) |
343 | return cpu_to_le16(NILFS_MAX_REC_LEN); |
344 | else if (len > (1 << 16)) |
345 | BUG(); |
346 | #endif |
347 | return cpu_to_le16(len); |
348 | } |
349 | |
350 | /** |
351 | * struct nilfs_finfo - file information |
352 | * @fi_ino: inode number |
353 | * @fi_cno: checkpoint number |
354 | * @fi_nblocks: number of blocks (including intermediate blocks) |
355 | * @fi_ndatablk: number of file data blocks |
356 | */ |
357 | struct nilfs_finfo { |
358 | __le64 fi_ino; |
359 | __le64 fi_cno; |
360 | __le32 fi_nblocks; |
361 | __le32 fi_ndatablk; |
362 | /* array of virtual block numbers */ |
363 | }; |
364 | |
365 | /** |
366 | * struct nilfs_binfo_v - information for the block to which a virtual block number is assigned |
367 | * @bi_vblocknr: virtual block number |
368 | * @bi_blkoff: block offset |
369 | */ |
370 | struct nilfs_binfo_v { |
371 | __le64 bi_vblocknr; |
372 | __le64 bi_blkoff; |
373 | }; |
374 | |
375 | /** |
376 | * struct nilfs_binfo_dat - information for the block which belongs to the DAT file |
377 | * @bi_blkoff: block offset |
378 | * @bi_level: level |
379 | * @bi_pad: padding |
380 | */ |
381 | struct nilfs_binfo_dat { |
382 | __le64 bi_blkoff; |
383 | __u8 bi_level; |
384 | __u8 bi_pad[7]; |
385 | }; |
386 | |
387 | /** |
388 | * union nilfs_binfo: block information |
389 | * @bi_v: nilfs_binfo_v structure |
390 | * @bi_dat: nilfs_binfo_dat structure |
391 | */ |
392 | union nilfs_binfo { |
393 | struct nilfs_binfo_v bi_v; |
394 | struct nilfs_binfo_dat bi_dat; |
395 | }; |
396 | |
397 | /** |
398 | * struct nilfs_segment_summary - segment summary header |
399 | * @ss_datasum: checksum of data |
400 | * @ss_sumsum: checksum of segment summary |
401 | * @ss_magic: magic number |
402 | * @ss_bytes: size of this structure in bytes |
403 | * @ss_flags: flags |
404 | * @ss_seq: sequence number |
405 | * @ss_create: creation timestamp |
406 | * @ss_next: next segment |
407 | * @ss_nblocks: number of blocks |
408 | * @ss_nfinfo: number of finfo structures |
409 | * @ss_sumbytes: total size of segment summary in bytes |
410 | * @ss_pad: padding |
411 | * @ss_cno: checkpoint number |
412 | */ |
413 | struct nilfs_segment_summary { |
414 | __le32 ss_datasum; |
415 | __le32 ss_sumsum; |
416 | __le32 ss_magic; |
417 | __le16 ss_bytes; |
418 | __le16 ss_flags; |
419 | __le64 ss_seq; |
420 | __le64 ss_create; |
421 | __le64 ss_next; |
422 | __le32 ss_nblocks; |
423 | __le32 ss_nfinfo; |
424 | __le32 ss_sumbytes; |
425 | __le32 ss_pad; |
426 | __le64 ss_cno; |
427 | /* array of finfo structures */ |
428 | }; |
429 | |
430 | #define NILFS_SEGSUM_MAGIC 0x1eaffa11 /* segment summary magic number */ |
431 | |
432 | /* |
433 | * Segment summary flags |
434 | */ |
435 | #define NILFS_SS_LOGBGN 0x0001 /* begins a logical segment */ |
436 | #define NILFS_SS_LOGEND 0x0002 /* ends a logical segment */ |
437 | #define NILFS_SS_SR 0x0004 /* has super root */ |
438 | #define NILFS_SS_SYNDT 0x0008 /* includes data only updates */ |
439 | #define NILFS_SS_GC 0x0010 /* segment written for cleaner operation */ |
440 | |
441 | /** |
442 | * struct nilfs_btree_node - B-tree node |
443 | * @bn_flags: flags |
444 | * @bn_level: level |
445 | * @bn_nchildren: number of children |
446 | * @bn_pad: padding |
447 | */ |
448 | struct nilfs_btree_node { |
449 | __u8 bn_flags; |
450 | __u8 bn_level; |
451 | __le16 bn_nchildren; |
452 | __le32 bn_pad; |
453 | }; |
454 | |
455 | /* flags */ |
456 | #define NILFS_BTREE_NODE_ROOT 0x01 |
457 | |
458 | /* level */ |
459 | #define NILFS_BTREE_LEVEL_DATA 0 |
460 | #define NILFS_BTREE_LEVEL_NODE_MIN (NILFS_BTREE_LEVEL_DATA + 1) |
461 | #define NILFS_BTREE_LEVEL_MAX 14 |
462 | |
463 | /** |
464 | * struct nilfs_palloc_group_desc - block group descriptor |
465 | * @pg_nfrees: number of free entries in block group |
466 | */ |
467 | struct nilfs_palloc_group_desc { |
468 | __le32 pg_nfrees; |
469 | }; |
470 | |
471 | /** |
472 | * struct nilfs_dat_entry - disk address translation entry |
473 | * @de_blocknr: block number |
474 | * @de_start: start checkpoint number |
475 | * @de_end: end checkpoint number |
476 | * @de_rsv: reserved for future use |
477 | */ |
478 | struct nilfs_dat_entry { |
479 | __le64 de_blocknr; |
480 | __le64 de_start; |
481 | __le64 de_end; |
482 | __le64 de_rsv; |
483 | }; |
484 | |
485 | /** |
486 | * struct nilfs_snapshot_list - snapshot list |
487 | * @ssl_next: next checkpoint number on snapshot list |
488 | * @ssl_prev: previous checkpoint number on snapshot list |
489 | */ |
490 | struct nilfs_snapshot_list { |
491 | __le64 ssl_next; |
492 | __le64 ssl_prev; |
493 | }; |
494 | |
495 | /** |
496 | * struct nilfs_checkpoint - checkpoint structure |
497 | * @cp_flags: flags |
498 | * @cp_checkpoints_count: checkpoints count in a block |
499 | * @cp_snapshot_list: snapshot list |
500 | * @cp_cno: checkpoint number |
501 | * @cp_create: creation timestamp |
502 | * @cp_nblk_inc: number of blocks incremented by this checkpoint |
503 | * @cp_inodes_count: inodes count |
504 | * @cp_blocks_count: blocks count |
505 | * @cp_ifile_inode: inode of ifile |
506 | */ |
507 | struct nilfs_checkpoint { |
508 | __le32 cp_flags; |
509 | __le32 cp_checkpoints_count; |
510 | struct nilfs_snapshot_list cp_snapshot_list; |
511 | __le64 cp_cno; |
512 | __le64 cp_create; |
513 | __le64 cp_nblk_inc; |
514 | __le64 cp_inodes_count; |
515 | __le64 cp_blocks_count; |
516 | |
517 | /* Do not change the byte offset of ifile inode. |
518 | To keep the compatibility of the disk format, |
519 | additional fields should be added behind cp_ifile_inode. */ |
520 | struct nilfs_inode cp_ifile_inode; |
521 | }; |
522 | |
523 | /* checkpoint flags */ |
524 | enum { |
525 | NILFS_CHECKPOINT_SNAPSHOT, |
526 | NILFS_CHECKPOINT_INVALID, |
527 | NILFS_CHECKPOINT_SKETCH, |
528 | NILFS_CHECKPOINT_MINOR, |
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) |
553 | NILFS_CHECKPOINT_FNS(MINOR, minor) |
554 | |
555 | /** |
556 | * struct nilfs_cpinfo - checkpoint information |
557 | * @ci_flags: flags |
558 | * @ci_pad: padding |
559 | * @ci_cno: checkpoint number |
560 | * @ci_create: creation timestamp |
561 | * @ci_nblk_inc: number of blocks incremented by this checkpoint |
562 | * @ci_inodes_count: inodes count |
563 | * @ci_blocks_count: blocks count |
564 | * @ci_next: next checkpoint number in snapshot list |
565 | */ |
566 | struct nilfs_cpinfo { |
567 | __u32 ci_flags; |
568 | __u32 ci_pad; |
569 | __u64 ci_cno; |
570 | __u64 ci_create; |
571 | __u64 ci_nblk_inc; |
572 | __u64 ci_inodes_count; |
573 | __u64 ci_blocks_count; |
574 | __u64 ci_next; |
575 | }; |
576 | |
577 | #define NILFS_CPINFO_FNS(flag, name) \ |
578 | static inline int \ |
579 | nilfs_cpinfo_##name(const struct nilfs_cpinfo *cpinfo) \ |
580 | { \ |
581 | return !!(cpinfo->ci_flags & (1UL << NILFS_CHECKPOINT_##flag)); \ |
582 | } |
583 | |
584 | NILFS_CPINFO_FNS(SNAPSHOT, snapshot) |
585 | NILFS_CPINFO_FNS(INVALID, invalid) |
586 | NILFS_CPINFO_FNS(MINOR, minor) |
587 | |
588 | |
589 | /** |
590 | * struct nilfs_cpfile_header - checkpoint file header |
591 | * @ch_ncheckpoints: number of checkpoints |
592 | * @ch_nsnapshots: number of snapshots |
593 | * @ch_snapshot_list: snapshot list |
594 | */ |
595 | struct nilfs_cpfile_header { |
596 | __le64 ch_ncheckpoints; |
597 | __le64 ch_nsnapshots; |
598 | struct nilfs_snapshot_list ch_snapshot_list; |
599 | }; |
600 | |
601 | #define NILFS_CPFILE_FIRST_CHECKPOINT_OFFSET \ |
602 | ((sizeof(struct nilfs_cpfile_header) + \ |
603 | sizeof(struct nilfs_checkpoint) - 1) / \ |
604 | sizeof(struct nilfs_checkpoint)) |
605 | |
606 | /** |
607 | * struct nilfs_segment_usage - segment usage |
608 | * @su_lastmod: last modified timestamp |
609 | * @su_nblocks: number of blocks in segment |
610 | * @su_flags: flags |
611 | */ |
612 | struct nilfs_segment_usage { |
613 | __le64 su_lastmod; |
614 | __le32 su_nblocks; |
615 | __le32 su_flags; |
616 | }; |
617 | |
618 | /* segment usage flag */ |
619 | enum { |
620 | NILFS_SEGMENT_USAGE_ACTIVE, |
621 | NILFS_SEGMENT_USAGE_DIRTY, |
622 | NILFS_SEGMENT_USAGE_ERROR, |
623 | |
624 | /* ... */ |
625 | }; |
626 | |
627 | #define NILFS_SEGMENT_USAGE_FNS(flag, name) \ |
628 | static inline void \ |
629 | nilfs_segment_usage_set_##name(struct nilfs_segment_usage *su) \ |
630 | { \ |
631 | su->su_flags = cpu_to_le32(le32_to_cpu(su->su_flags) | \ |
632 | (1UL << NILFS_SEGMENT_USAGE_##flag));\ |
633 | } \ |
634 | static inline void \ |
635 | nilfs_segment_usage_clear_##name(struct nilfs_segment_usage *su) \ |
636 | { \ |
637 | su->su_flags = \ |
638 | cpu_to_le32(le32_to_cpu(su->su_flags) & \ |
639 | ~(1UL << NILFS_SEGMENT_USAGE_##flag)); \ |
640 | } \ |
641 | static inline int \ |
642 | nilfs_segment_usage_##name(const struct nilfs_segment_usage *su) \ |
643 | { \ |
644 | return !!(le32_to_cpu(su->su_flags) & \ |
645 | (1UL << NILFS_SEGMENT_USAGE_##flag)); \ |
646 | } |
647 | |
648 | NILFS_SEGMENT_USAGE_FNS(ACTIVE, active) |
649 | NILFS_SEGMENT_USAGE_FNS(DIRTY, dirty) |
650 | NILFS_SEGMENT_USAGE_FNS(ERROR, error) |
651 | |
652 | static inline void |
653 | nilfs_segment_usage_set_clean(struct nilfs_segment_usage *su) |
654 | { |
655 | su->su_lastmod = cpu_to_le64(0); |
656 | su->su_nblocks = cpu_to_le32(0); |
657 | su->su_flags = cpu_to_le32(0); |
658 | } |
659 | |
660 | static inline int |
661 | nilfs_segment_usage_clean(const struct nilfs_segment_usage *su) |
662 | { |
663 | return !le32_to_cpu(su->su_flags); |
664 | } |
665 | |
666 | /** |
667 | * struct nilfs_sufile_header - segment usage file header |
668 | * @sh_ncleansegs: number of clean segments |
669 | * @sh_ndirtysegs: number of dirty segments |
670 | * @sh_last_alloc: last allocated segment number |
671 | */ |
672 | struct nilfs_sufile_header { |
673 | __le64 sh_ncleansegs; |
674 | __le64 sh_ndirtysegs; |
675 | __le64 sh_last_alloc; |
676 | /* ... */ |
677 | }; |
678 | |
679 | #define NILFS_SUFILE_FIRST_SEGMENT_USAGE_OFFSET \ |
680 | ((sizeof(struct nilfs_sufile_header) + \ |
681 | sizeof(struct nilfs_segment_usage) - 1) / \ |
682 | sizeof(struct nilfs_segment_usage)) |
683 | |
684 | /** |
685 | * nilfs_suinfo - segment usage information |
686 | * @sui_lastmod: timestamp of last modification |
687 | * @sui_nblocks: number of written blocks in segment |
688 | * @sui_flags: segment usage flags |
689 | */ |
690 | struct nilfs_suinfo { |
691 | __u64 sui_lastmod; |
692 | __u32 sui_nblocks; |
693 | __u32 sui_flags; |
694 | }; |
695 | |
696 | #define NILFS_SUINFO_FNS(flag, name) \ |
697 | static inline int \ |
698 | nilfs_suinfo_##name(const struct nilfs_suinfo *si) \ |
699 | { \ |
700 | return si->sui_flags & (1UL << NILFS_SEGMENT_USAGE_##flag); \ |
701 | } |
702 | |
703 | NILFS_SUINFO_FNS(ACTIVE, active) |
704 | NILFS_SUINFO_FNS(DIRTY, dirty) |
705 | NILFS_SUINFO_FNS(ERROR, error) |
706 | |
707 | static inline int nilfs_suinfo_clean(const struct nilfs_suinfo *si) |
708 | { |
709 | return !si->sui_flags; |
710 | } |
711 | |
712 | /* ioctl */ |
713 | enum { |
714 | NILFS_CHECKPOINT, |
715 | NILFS_SNAPSHOT, |
716 | }; |
717 | |
718 | /** |
719 | * struct nilfs_cpmode - change checkpoint mode structure |
720 | * @cm_cno: checkpoint number |
721 | * @cm_mode: mode of checkpoint |
722 | * @cm_pad: padding |
723 | */ |
724 | struct nilfs_cpmode { |
725 | __u64 cm_cno; |
726 | __u32 cm_mode; |
727 | __u32 cm_pad; |
728 | }; |
729 | |
730 | /** |
731 | * struct nilfs_argv - argument vector |
732 | * @v_base: pointer on data array from userspace |
733 | * @v_nmembs: number of members in data array |
734 | * @v_size: size of data array in bytes |
735 | * @v_flags: flags |
736 | * @v_index: start number of target data items |
737 | */ |
738 | struct nilfs_argv { |
739 | __u64 v_base; |
740 | __u32 v_nmembs; /* number of members */ |
741 | __u16 v_size; /* size of members */ |
742 | __u16 v_flags; |
743 | __u64 v_index; |
744 | }; |
745 | |
746 | /** |
747 | * struct nilfs_period - period of checkpoint numbers |
748 | * @p_start: start checkpoint number (inclusive) |
749 | * @p_end: end checkpoint number (exclusive) |
750 | */ |
751 | struct nilfs_period { |
752 | __u64 p_start; |
753 | __u64 p_end; |
754 | }; |
755 | |
756 | /** |
757 | * struct nilfs_cpstat - checkpoint statistics |
758 | * @cs_cno: checkpoint number |
759 | * @cs_ncps: number of checkpoints |
760 | * @cs_nsss: number of snapshots |
761 | */ |
762 | struct nilfs_cpstat { |
763 | __u64 cs_cno; |
764 | __u64 cs_ncps; |
765 | __u64 cs_nsss; |
766 | }; |
767 | |
768 | /** |
769 | * struct nilfs_sustat - segment usage statistics |
770 | * @ss_nsegs: number of segments |
771 | * @ss_ncleansegs: number of clean segments |
772 | * @ss_ndirtysegs: number of dirty segments |
773 | * @ss_ctime: creation time of the last segment |
774 | * @ss_nongc_ctime: creation time of the last segment not for GC |
775 | * @ss_prot_seq: least sequence number of segments which must not be reclaimed |
776 | */ |
777 | struct nilfs_sustat { |
778 | __u64 ss_nsegs; |
779 | __u64 ss_ncleansegs; |
780 | __u64 ss_ndirtysegs; |
781 | __u64 ss_ctime; |
782 | __u64 ss_nongc_ctime; |
783 | __u64 ss_prot_seq; |
784 | }; |
785 | |
786 | /** |
787 | * struct nilfs_vinfo - virtual block number information |
788 | * @vi_vblocknr: virtual block number |
789 | * @vi_start: start checkpoint number (inclusive) |
790 | * @vi_end: end checkpoint number (exclusive) |
791 | * @vi_blocknr: disk block number |
792 | */ |
793 | struct nilfs_vinfo { |
794 | __u64 vi_vblocknr; |
795 | __u64 vi_start; |
796 | __u64 vi_end; |
797 | __u64 vi_blocknr; |
798 | }; |
799 | |
800 | /** |
801 | * struct nilfs_vdesc - descriptor of virtual block number |
802 | * @vd_ino: inode number |
803 | * @vd_cno: checkpoint number |
804 | * @vd_vblocknr: virtual block number |
805 | * @vd_period: period of checkpoint numbers |
806 | * @vd_blocknr: disk block number |
807 | * @vd_offset: logical block offset inside a file |
808 | * @vd_flags: flags (data or node block) |
809 | * @vd_pad: padding |
810 | */ |
811 | struct nilfs_vdesc { |
812 | __u64 vd_ino; |
813 | __u64 vd_cno; |
814 | __u64 vd_vblocknr; |
815 | struct nilfs_period vd_period; |
816 | __u64 vd_blocknr; |
817 | __u64 vd_offset; |
818 | __u32 vd_flags; |
819 | __u32 vd_pad; |
820 | }; |
821 | |
822 | /** |
823 | * struct nilfs_bdesc - descriptor of disk block number |
824 | * @bd_ino: inode number |
825 | * @bd_oblocknr: disk block address (for skipping dead blocks) |
826 | * @bd_blocknr: disk block address |
827 | * @bd_offset: logical block offset inside a file |
828 | * @bd_level: level in the b-tree organization |
829 | * @bd_pad: padding |
830 | */ |
831 | struct nilfs_bdesc { |
832 | __u64 bd_ino; |
833 | __u64 bd_oblocknr; |
834 | __u64 bd_blocknr; |
835 | __u64 bd_offset; |
836 | __u32 bd_level; |
837 | __u32 bd_pad; |
838 | }; |
839 | |
840 | #define NILFS_IOCTL_IDENT 'n' |
841 | |
842 | #define NILFS_IOCTL_CHANGE_CPMODE \ |
843 | _IOW(NILFS_IOCTL_IDENT, 0x80, struct nilfs_cpmode) |
844 | #define NILFS_IOCTL_DELETE_CHECKPOINT \ |
845 | _IOW(NILFS_IOCTL_IDENT, 0x81, __u64) |
846 | #define NILFS_IOCTL_GET_CPINFO \ |
847 | _IOR(NILFS_IOCTL_IDENT, 0x82, struct nilfs_argv) |
848 | #define NILFS_IOCTL_GET_CPSTAT \ |
849 | _IOR(NILFS_IOCTL_IDENT, 0x83, struct nilfs_cpstat) |
850 | #define NILFS_IOCTL_GET_SUINFO \ |
851 | _IOR(NILFS_IOCTL_IDENT, 0x84, struct nilfs_argv) |
852 | #define NILFS_IOCTL_GET_SUSTAT \ |
853 | _IOR(NILFS_IOCTL_IDENT, 0x85, struct nilfs_sustat) |
854 | #define NILFS_IOCTL_GET_VINFO \ |
855 | _IOWR(NILFS_IOCTL_IDENT, 0x86, struct nilfs_argv) |
856 | #define NILFS_IOCTL_GET_BDESCS \ |
857 | _IOWR(NILFS_IOCTL_IDENT, 0x87, struct nilfs_argv) |
858 | #define NILFS_IOCTL_CLEAN_SEGMENTS \ |
859 | _IOW(NILFS_IOCTL_IDENT, 0x88, struct nilfs_argv[5]) |
860 | #define NILFS_IOCTL_SYNC \ |
861 | _IOR(NILFS_IOCTL_IDENT, 0x8A, __u64) |
862 | #define NILFS_IOCTL_RESIZE \ |
863 | _IOW(NILFS_IOCTL_IDENT, 0x8B, __u64) |
864 | #define NILFS_IOCTL_SET_ALLOC_RANGE \ |
865 | _IOW(NILFS_IOCTL_IDENT, 0x8C, __u64[2]) |
866 | |
867 | #endif /* _LINUX_NILFS_FS_H */ |
868 |
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