Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Sistina Software | |
3 | * | |
4 | * This file is released under the LGPL. | |
5 | */ | |
6 | ||
7 | #include <linux/init.h> | |
8 | #include <linux/slab.h> | |
9 | #include <linux/module.h> | |
10 | #include <linux/vmalloc.h> | |
11 | ||
12 | #include "dm-log.h" | |
13 | #include "dm-io.h" | |
14 | ||
72d94861 AK |
15 | #define DM_MSG_PREFIX "mirror log" |
16 | ||
1da177e4 LT |
17 | static LIST_HEAD(_log_types); |
18 | static DEFINE_SPINLOCK(_lock); | |
19 | ||
20 | int dm_register_dirty_log_type(struct dirty_log_type *type) | |
21 | { | |
22 | spin_lock(&_lock); | |
23 | type->use_count = 0; | |
24 | list_add(&type->list, &_log_types); | |
25 | spin_unlock(&_lock); | |
26 | ||
27 | return 0; | |
28 | } | |
29 | ||
30 | int dm_unregister_dirty_log_type(struct dirty_log_type *type) | |
31 | { | |
32 | spin_lock(&_lock); | |
33 | ||
34 | if (type->use_count) | |
35 | DMWARN("Attempt to unregister a log type that is still in use"); | |
36 | else | |
37 | list_del(&type->list); | |
38 | ||
39 | spin_unlock(&_lock); | |
40 | ||
41 | return 0; | |
42 | } | |
43 | ||
44 | static struct dirty_log_type *get_type(const char *type_name) | |
45 | { | |
46 | struct dirty_log_type *type; | |
47 | ||
48 | spin_lock(&_lock); | |
49 | list_for_each_entry (type, &_log_types, list) | |
50 | if (!strcmp(type_name, type->name)) { | |
51 | if (!type->use_count && !try_module_get(type->module)){ | |
52 | spin_unlock(&_lock); | |
53 | return NULL; | |
54 | } | |
55 | type->use_count++; | |
56 | spin_unlock(&_lock); | |
57 | return type; | |
58 | } | |
59 | ||
60 | spin_unlock(&_lock); | |
61 | return NULL; | |
62 | } | |
63 | ||
64 | static void put_type(struct dirty_log_type *type) | |
65 | { | |
66 | spin_lock(&_lock); | |
67 | if (!--type->use_count) | |
68 | module_put(type->module); | |
69 | spin_unlock(&_lock); | |
70 | } | |
71 | ||
72 | struct dirty_log *dm_create_dirty_log(const char *type_name, struct dm_target *ti, | |
73 | unsigned int argc, char **argv) | |
74 | { | |
75 | struct dirty_log_type *type; | |
76 | struct dirty_log *log; | |
77 | ||
78 | log = kmalloc(sizeof(*log), GFP_KERNEL); | |
79 | if (!log) | |
80 | return NULL; | |
81 | ||
82 | type = get_type(type_name); | |
83 | if (!type) { | |
84 | kfree(log); | |
85 | return NULL; | |
86 | } | |
87 | ||
88 | log->type = type; | |
89 | if (type->ctr(log, ti, argc, argv)) { | |
90 | kfree(log); | |
91 | put_type(type); | |
92 | return NULL; | |
93 | } | |
94 | ||
95 | return log; | |
96 | } | |
97 | ||
98 | void dm_destroy_dirty_log(struct dirty_log *log) | |
99 | { | |
100 | log->type->dtr(log); | |
101 | put_type(log->type); | |
102 | kfree(log); | |
103 | } | |
104 | ||
105 | /*----------------------------------------------------------------- | |
106 | * Persistent and core logs share a lot of their implementation. | |
107 | * FIXME: need a reload method to be called from a resume | |
108 | *---------------------------------------------------------------*/ | |
109 | /* | |
110 | * Magic for persistent mirrors: "MiRr" | |
111 | */ | |
112 | #define MIRROR_MAGIC 0x4D695272 | |
113 | ||
114 | /* | |
115 | * The on-disk version of the metadata. | |
116 | */ | |
a4fc4717 | 117 | #define MIRROR_DISK_VERSION 2 |
1da177e4 LT |
118 | #define LOG_OFFSET 2 |
119 | ||
120 | struct log_header { | |
121 | uint32_t magic; | |
122 | ||
123 | /* | |
124 | * Simple, incrementing version. no backward | |
125 | * compatibility. | |
126 | */ | |
127 | uint32_t version; | |
128 | sector_t nr_regions; | |
129 | }; | |
130 | ||
131 | struct log_c { | |
132 | struct dm_target *ti; | |
133 | int touched; | |
134 | uint32_t region_size; | |
135 | unsigned int region_count; | |
136 | region_t sync_count; | |
137 | ||
138 | unsigned bitset_uint32_count; | |
139 | uint32_t *clean_bits; | |
140 | uint32_t *sync_bits; | |
141 | uint32_t *recovering_bits; /* FIXME: this seems excessive */ | |
142 | ||
143 | int sync_search; | |
144 | ||
145 | /* Resync flag */ | |
146 | enum sync { | |
147 | DEFAULTSYNC, /* Synchronize if necessary */ | |
148 | NOSYNC, /* Devices known to be already in sync */ | |
149 | FORCESYNC, /* Force a sync to happen */ | |
150 | } sync; | |
151 | ||
152 | /* | |
153 | * Disk log fields | |
154 | */ | |
155 | struct dm_dev *log_dev; | |
156 | struct log_header header; | |
157 | ||
158 | struct io_region header_location; | |
159 | struct log_header *disk_header; | |
1da177e4 LT |
160 | }; |
161 | ||
162 | /* | |
163 | * The touched member needs to be updated every time we access | |
164 | * one of the bitsets. | |
165 | */ | |
166 | static inline int log_test_bit(uint32_t *bs, unsigned bit) | |
167 | { | |
a4fc4717 | 168 | return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; |
1da177e4 LT |
169 | } |
170 | ||
171 | static inline void log_set_bit(struct log_c *l, | |
172 | uint32_t *bs, unsigned bit) | |
173 | { | |
a4fc4717 | 174 | ext2_set_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
175 | l->touched = 1; |
176 | } | |
177 | ||
178 | static inline void log_clear_bit(struct log_c *l, | |
179 | uint32_t *bs, unsigned bit) | |
180 | { | |
a4fc4717 | 181 | ext2_clear_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
182 | l->touched = 1; |
183 | } | |
184 | ||
185 | /*---------------------------------------------------------------- | |
186 | * Header IO | |
187 | *--------------------------------------------------------------*/ | |
188 | static void header_to_disk(struct log_header *core, struct log_header *disk) | |
189 | { | |
190 | disk->magic = cpu_to_le32(core->magic); | |
191 | disk->version = cpu_to_le32(core->version); | |
192 | disk->nr_regions = cpu_to_le64(core->nr_regions); | |
193 | } | |
194 | ||
195 | static void header_from_disk(struct log_header *core, struct log_header *disk) | |
196 | { | |
197 | core->magic = le32_to_cpu(disk->magic); | |
198 | core->version = le32_to_cpu(disk->version); | |
199 | core->nr_regions = le64_to_cpu(disk->nr_regions); | |
200 | } | |
201 | ||
202 | static int read_header(struct log_c *log) | |
203 | { | |
204 | int r; | |
205 | unsigned long ebits; | |
206 | ||
207 | r = dm_io_sync_vm(1, &log->header_location, READ, | |
208 | log->disk_header, &ebits); | |
209 | if (r) | |
210 | return r; | |
211 | ||
212 | header_from_disk(&log->header, log->disk_header); | |
213 | ||
214 | /* New log required? */ | |
215 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { | |
216 | log->header.magic = MIRROR_MAGIC; | |
217 | log->header.version = MIRROR_DISK_VERSION; | |
218 | log->header.nr_regions = 0; | |
219 | } | |
220 | ||
a4fc4717 PC |
221 | #ifdef __LITTLE_ENDIAN |
222 | if (log->header.version == 1) | |
223 | log->header.version = 2; | |
224 | #endif | |
225 | ||
1da177e4 LT |
226 | if (log->header.version != MIRROR_DISK_VERSION) { |
227 | DMWARN("incompatible disk log version"); | |
228 | return -EINVAL; | |
229 | } | |
230 | ||
231 | return 0; | |
232 | } | |
233 | ||
234 | static inline int write_header(struct log_c *log) | |
235 | { | |
236 | unsigned long ebits; | |
237 | ||
238 | header_to_disk(&log->header, log->disk_header); | |
239 | return dm_io_sync_vm(1, &log->header_location, WRITE, | |
240 | log->disk_header, &ebits); | |
241 | } | |
242 | ||
1da177e4 LT |
243 | /*---------------------------------------------------------------- |
244 | * core log constructor/destructor | |
245 | * | |
246 | * argv contains region_size followed optionally by [no]sync | |
247 | *--------------------------------------------------------------*/ | |
248 | #define BYTE_SHIFT 3 | |
b7cca195 AK |
249 | static int create_log_context(struct dirty_log *log, struct dm_target *ti, |
250 | unsigned int argc, char **argv, | |
251 | struct dm_dev *dev) | |
1da177e4 LT |
252 | { |
253 | enum sync sync = DEFAULTSYNC; | |
254 | ||
255 | struct log_c *lc; | |
256 | uint32_t region_size; | |
257 | unsigned int region_count; | |
b7cca195 | 258 | size_t bitset_size, buf_size; |
1da177e4 LT |
259 | |
260 | if (argc < 1 || argc > 2) { | |
261 | DMWARN("wrong number of arguments to mirror log"); | |
262 | return -EINVAL; | |
263 | } | |
264 | ||
265 | if (argc > 1) { | |
266 | if (!strcmp(argv[1], "sync")) | |
267 | sync = FORCESYNC; | |
268 | else if (!strcmp(argv[1], "nosync")) | |
269 | sync = NOSYNC; | |
270 | else { | |
271 | DMWARN("unrecognised sync argument to mirror log: %s", | |
272 | argv[1]); | |
273 | return -EINVAL; | |
274 | } | |
275 | } | |
276 | ||
277 | if (sscanf(argv[0], "%u", ®ion_size) != 1) { | |
278 | DMWARN("invalid region size string"); | |
279 | return -EINVAL; | |
280 | } | |
281 | ||
282 | region_count = dm_sector_div_up(ti->len, region_size); | |
283 | ||
284 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
285 | if (!lc) { | |
286 | DMWARN("couldn't allocate core log"); | |
287 | return -ENOMEM; | |
288 | } | |
289 | ||
290 | lc->ti = ti; | |
291 | lc->touched = 0; | |
292 | lc->region_size = region_size; | |
293 | lc->region_count = region_count; | |
294 | lc->sync = sync; | |
295 | ||
296 | /* | |
0e56822d | 297 | * Work out how many "unsigned long"s we need to hold the bitset. |
1da177e4 LT |
298 | */ |
299 | bitset_size = dm_round_up(region_count, | |
29121bd0 | 300 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
1da177e4 LT |
301 | bitset_size >>= BYTE_SHIFT; |
302 | ||
29121bd0 | 303 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
b7cca195 AK |
304 | |
305 | /* | |
306 | * Disk log? | |
307 | */ | |
308 | if (!dev) { | |
309 | lc->clean_bits = vmalloc(bitset_size); | |
310 | if (!lc->clean_bits) { | |
311 | DMWARN("couldn't allocate clean bitset"); | |
312 | kfree(lc); | |
313 | return -ENOMEM; | |
314 | } | |
315 | lc->disk_header = NULL; | |
316 | } else { | |
317 | lc->log_dev = dev; | |
318 | lc->header_location.bdev = lc->log_dev->bdev; | |
319 | lc->header_location.sector = 0; | |
320 | ||
321 | /* | |
322 | * Buffer holds both header and bitset. | |
323 | */ | |
324 | buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + | |
325 | bitset_size, ti->limits.hardsect_size); | |
326 | lc->header_location.count = buf_size >> SECTOR_SHIFT; | |
327 | ||
328 | lc->disk_header = vmalloc(buf_size); | |
329 | if (!lc->disk_header) { | |
330 | DMWARN("couldn't allocate disk log buffer"); | |
331 | kfree(lc); | |
332 | return -ENOMEM; | |
333 | } | |
334 | ||
335 | lc->clean_bits = (void *)lc->disk_header + | |
336 | (LOG_OFFSET << SECTOR_SHIFT); | |
1da177e4 | 337 | } |
b7cca195 | 338 | |
1da177e4 LT |
339 | memset(lc->clean_bits, -1, bitset_size); |
340 | ||
341 | lc->sync_bits = vmalloc(bitset_size); | |
342 | if (!lc->sync_bits) { | |
343 | DMWARN("couldn't allocate sync bitset"); | |
b7cca195 AK |
344 | if (!dev) |
345 | vfree(lc->clean_bits); | |
346 | vfree(lc->disk_header); | |
1da177e4 LT |
347 | kfree(lc); |
348 | return -ENOMEM; | |
349 | } | |
350 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); | |
351 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; | |
352 | ||
353 | lc->recovering_bits = vmalloc(bitset_size); | |
354 | if (!lc->recovering_bits) { | |
355 | DMWARN("couldn't allocate sync bitset"); | |
356 | vfree(lc->sync_bits); | |
b7cca195 AK |
357 | if (!dev) |
358 | vfree(lc->clean_bits); | |
359 | vfree(lc->disk_header); | |
1da177e4 LT |
360 | kfree(lc); |
361 | return -ENOMEM; | |
362 | } | |
363 | memset(lc->recovering_bits, 0, bitset_size); | |
364 | lc->sync_search = 0; | |
365 | log->context = lc; | |
b7cca195 | 366 | |
1da177e4 LT |
367 | return 0; |
368 | } | |
369 | ||
b7cca195 AK |
370 | static int core_ctr(struct dirty_log *log, struct dm_target *ti, |
371 | unsigned int argc, char **argv) | |
372 | { | |
373 | return create_log_context(log, ti, argc, argv, NULL); | |
374 | } | |
375 | ||
376 | static void destroy_log_context(struct log_c *lc) | |
1da177e4 | 377 | { |
1da177e4 LT |
378 | vfree(lc->sync_bits); |
379 | vfree(lc->recovering_bits); | |
380 | kfree(lc); | |
381 | } | |
382 | ||
b7cca195 AK |
383 | static void core_dtr(struct dirty_log *log) |
384 | { | |
385 | struct log_c *lc = (struct log_c *) log->context; | |
386 | ||
387 | vfree(lc->clean_bits); | |
388 | destroy_log_context(lc); | |
389 | } | |
390 | ||
1da177e4 LT |
391 | /*---------------------------------------------------------------- |
392 | * disk log constructor/destructor | |
393 | * | |
394 | * argv contains log_device region_size followed optionally by [no]sync | |
395 | *--------------------------------------------------------------*/ | |
396 | static int disk_ctr(struct dirty_log *log, struct dm_target *ti, | |
397 | unsigned int argc, char **argv) | |
398 | { | |
399 | int r; | |
1da177e4 LT |
400 | struct dm_dev *dev; |
401 | ||
402 | if (argc < 2 || argc > 3) { | |
403 | DMWARN("wrong number of arguments to disk mirror log"); | |
404 | return -EINVAL; | |
405 | } | |
406 | ||
407 | r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */, | |
408 | FMODE_READ | FMODE_WRITE, &dev); | |
409 | if (r) | |
410 | return r; | |
411 | ||
b7cca195 | 412 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
1da177e4 LT |
413 | if (r) { |
414 | dm_put_device(ti, dev); | |
415 | return r; | |
416 | } | |
417 | ||
1da177e4 | 418 | return 0; |
1da177e4 LT |
419 | } |
420 | ||
421 | static void disk_dtr(struct dirty_log *log) | |
422 | { | |
423 | struct log_c *lc = (struct log_c *) log->context; | |
b7cca195 | 424 | |
1da177e4 LT |
425 | dm_put_device(lc->ti, lc->log_dev); |
426 | vfree(lc->disk_header); | |
b7cca195 | 427 | destroy_log_context(lc); |
1da177e4 LT |
428 | } |
429 | ||
430 | static int count_bits32(uint32_t *addr, unsigned size) | |
431 | { | |
432 | int count = 0, i; | |
433 | ||
434 | for (i = 0; i < size; i++) { | |
435 | count += hweight32(*(addr+i)); | |
436 | } | |
437 | return count; | |
438 | } | |
439 | ||
440 | static int disk_resume(struct dirty_log *log) | |
441 | { | |
442 | int r; | |
443 | unsigned i; | |
444 | struct log_c *lc = (struct log_c *) log->context; | |
445 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); | |
446 | ||
447 | /* read the disk header */ | |
448 | r = read_header(lc); | |
449 | if (r) | |
450 | return r; | |
451 | ||
8a835f11 | 452 | /* set or clear any new bits -- device has grown */ |
1da177e4 LT |
453 | if (lc->sync == NOSYNC) |
454 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
455 | /* FIXME: amazingly inefficient */ | |
456 | log_set_bit(lc, lc->clean_bits, i); | |
457 | else | |
458 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
459 | /* FIXME: amazingly inefficient */ | |
460 | log_clear_bit(lc, lc->clean_bits, i); | |
461 | ||
8a835f11 AK |
462 | /* clear any old bits -- device has shrunk */ |
463 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) | |
464 | log_clear_bit(lc, lc->clean_bits, i); | |
465 | ||
1da177e4 LT |
466 | /* copy clean across to sync */ |
467 | memcpy(lc->sync_bits, lc->clean_bits, size); | |
468 | lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); | |
469 | ||
1da177e4 LT |
470 | /* set the correct number of regions in the header */ |
471 | lc->header.nr_regions = lc->region_count; | |
472 | ||
473 | /* write the new header */ | |
474 | return write_header(lc); | |
475 | } | |
476 | ||
477 | static uint32_t core_get_region_size(struct dirty_log *log) | |
478 | { | |
479 | struct log_c *lc = (struct log_c *) log->context; | |
480 | return lc->region_size; | |
481 | } | |
482 | ||
483 | static int core_is_clean(struct dirty_log *log, region_t region) | |
484 | { | |
485 | struct log_c *lc = (struct log_c *) log->context; | |
486 | return log_test_bit(lc->clean_bits, region); | |
487 | } | |
488 | ||
489 | static int core_in_sync(struct dirty_log *log, region_t region, int block) | |
490 | { | |
491 | struct log_c *lc = (struct log_c *) log->context; | |
492 | return log_test_bit(lc->sync_bits, region); | |
493 | } | |
494 | ||
495 | static int core_flush(struct dirty_log *log) | |
496 | { | |
497 | /* no op */ | |
498 | return 0; | |
499 | } | |
500 | ||
501 | static int disk_flush(struct dirty_log *log) | |
502 | { | |
503 | int r; | |
504 | struct log_c *lc = (struct log_c *) log->context; | |
505 | ||
506 | /* only write if the log has changed */ | |
507 | if (!lc->touched) | |
508 | return 0; | |
509 | ||
702ca6f0 | 510 | r = write_header(lc); |
1da177e4 LT |
511 | if (!r) |
512 | lc->touched = 0; | |
513 | ||
514 | return r; | |
515 | } | |
516 | ||
517 | static void core_mark_region(struct dirty_log *log, region_t region) | |
518 | { | |
519 | struct log_c *lc = (struct log_c *) log->context; | |
520 | log_clear_bit(lc, lc->clean_bits, region); | |
521 | } | |
522 | ||
523 | static void core_clear_region(struct dirty_log *log, region_t region) | |
524 | { | |
525 | struct log_c *lc = (struct log_c *) log->context; | |
526 | log_set_bit(lc, lc->clean_bits, region); | |
527 | } | |
528 | ||
529 | static int core_get_resync_work(struct dirty_log *log, region_t *region) | |
530 | { | |
531 | struct log_c *lc = (struct log_c *) log->context; | |
532 | ||
533 | if (lc->sync_search >= lc->region_count) | |
534 | return 0; | |
535 | ||
536 | do { | |
1113a7e9 SB |
537 | *region = ext2_find_next_zero_bit( |
538 | (unsigned long *) lc->sync_bits, | |
1da177e4 LT |
539 | lc->region_count, |
540 | lc->sync_search); | |
541 | lc->sync_search = *region + 1; | |
542 | ||
ac81b2ee | 543 | if (*region >= lc->region_count) |
1da177e4 LT |
544 | return 0; |
545 | ||
546 | } while (log_test_bit(lc->recovering_bits, *region)); | |
547 | ||
548 | log_set_bit(lc, lc->recovering_bits, *region); | |
549 | return 1; | |
550 | } | |
551 | ||
552 | static void core_complete_resync_work(struct dirty_log *log, region_t region, | |
553 | int success) | |
554 | { | |
555 | struct log_c *lc = (struct log_c *) log->context; | |
556 | ||
557 | log_clear_bit(lc, lc->recovering_bits, region); | |
558 | if (success) { | |
559 | log_set_bit(lc, lc->sync_bits, region); | |
560 | lc->sync_count++; | |
561 | } | |
562 | } | |
563 | ||
564 | static region_t core_get_sync_count(struct dirty_log *log) | |
565 | { | |
566 | struct log_c *lc = (struct log_c *) log->context; | |
567 | ||
568 | return lc->sync_count; | |
569 | } | |
570 | ||
571 | #define DMEMIT_SYNC \ | |
572 | if (lc->sync != DEFAULTSYNC) \ | |
573 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") | |
574 | ||
575 | static int core_status(struct dirty_log *log, status_type_t status, | |
576 | char *result, unsigned int maxlen) | |
577 | { | |
578 | int sz = 0; | |
579 | struct log_c *lc = log->context; | |
580 | ||
581 | switch(status) { | |
582 | case STATUSTYPE_INFO: | |
583 | break; | |
584 | ||
585 | case STATUSTYPE_TABLE: | |
586 | DMEMIT("%s %u %u ", log->type->name, | |
587 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); | |
588 | DMEMIT_SYNC; | |
589 | } | |
590 | ||
591 | return sz; | |
592 | } | |
593 | ||
594 | static int disk_status(struct dirty_log *log, status_type_t status, | |
595 | char *result, unsigned int maxlen) | |
596 | { | |
597 | int sz = 0; | |
598 | char buffer[16]; | |
599 | struct log_c *lc = log->context; | |
600 | ||
601 | switch(status) { | |
602 | case STATUSTYPE_INFO: | |
603 | break; | |
604 | ||
605 | case STATUSTYPE_TABLE: | |
606 | format_dev_t(buffer, lc->log_dev->bdev->bd_dev); | |
607 | DMEMIT("%s %u %s %u ", log->type->name, | |
608 | lc->sync == DEFAULTSYNC ? 2 : 3, buffer, | |
609 | lc->region_size); | |
610 | DMEMIT_SYNC; | |
611 | } | |
612 | ||
613 | return sz; | |
614 | } | |
615 | ||
616 | static struct dirty_log_type _core_type = { | |
617 | .name = "core", | |
618 | .module = THIS_MODULE, | |
619 | .ctr = core_ctr, | |
620 | .dtr = core_dtr, | |
621 | .get_region_size = core_get_region_size, | |
622 | .is_clean = core_is_clean, | |
623 | .in_sync = core_in_sync, | |
624 | .flush = core_flush, | |
625 | .mark_region = core_mark_region, | |
626 | .clear_region = core_clear_region, | |
627 | .get_resync_work = core_get_resync_work, | |
628 | .complete_resync_work = core_complete_resync_work, | |
629 | .get_sync_count = core_get_sync_count, | |
630 | .status = core_status, | |
631 | }; | |
632 | ||
633 | static struct dirty_log_type _disk_type = { | |
634 | .name = "disk", | |
635 | .module = THIS_MODULE, | |
636 | .ctr = disk_ctr, | |
637 | .dtr = disk_dtr, | |
638 | .suspend = disk_flush, | |
639 | .resume = disk_resume, | |
640 | .get_region_size = core_get_region_size, | |
641 | .is_clean = core_is_clean, | |
642 | .in_sync = core_in_sync, | |
643 | .flush = disk_flush, | |
644 | .mark_region = core_mark_region, | |
645 | .clear_region = core_clear_region, | |
646 | .get_resync_work = core_get_resync_work, | |
647 | .complete_resync_work = core_complete_resync_work, | |
648 | .get_sync_count = core_get_sync_count, | |
649 | .status = disk_status, | |
650 | }; | |
651 | ||
652 | int __init dm_dirty_log_init(void) | |
653 | { | |
654 | int r; | |
655 | ||
656 | r = dm_register_dirty_log_type(&_core_type); | |
657 | if (r) | |
658 | DMWARN("couldn't register core log"); | |
659 | ||
660 | r = dm_register_dirty_log_type(&_disk_type); | |
661 | if (r) { | |
662 | DMWARN("couldn't register disk type"); | |
663 | dm_unregister_dirty_log_type(&_core_type); | |
664 | } | |
665 | ||
666 | return r; | |
667 | } | |
668 | ||
669 | void dm_dirty_log_exit(void) | |
670 | { | |
671 | dm_unregister_dirty_log_type(&_disk_type); | |
672 | dm_unregister_dirty_log_type(&_core_type); | |
673 | } | |
674 | ||
675 | EXPORT_SYMBOL(dm_register_dirty_log_type); | |
676 | EXPORT_SYMBOL(dm_unregister_dirty_log_type); | |
677 | EXPORT_SYMBOL(dm_create_dirty_log); | |
678 | EXPORT_SYMBOL(dm_destroy_dirty_log); |