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