blob: a503d12c2ff84e8b5c5dadfe94094f5178b21c5f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Alasdair G Kergon72d94862006-06-26 00:27:35 -070015#define DM_MSG_PREFIX "mirror log"
16
Linus Torvalds1da177e2005-04-16 15:20:36 -070017static LIST_HEAD(_log_types);
18static DEFINE_SPINLOCK(_lock);
19
20int 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
30int 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
44static 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
64static 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
72struct 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
98void 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 */
Patrick Caulfielda4fc4712006-02-01 03:04:51 -0800117#define MIRROR_DISK_VERSION 2
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#define LOG_OFFSET 2
119
120struct 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
131struct 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 */
Jonathan E Brassow01d03a62007-05-09 02:32:57 -0700155 int log_dev_failed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct dm_dev *log_dev;
157 struct log_header header;
158
159 struct io_region header_location;
160 struct log_header *disk_header;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161};
162
163/*
164 * The touched member needs to be updated every time we access
165 * one of the bitsets.
166 */
167static inline int log_test_bit(uint32_t *bs, unsigned bit)
168{
Patrick Caulfielda4fc4712006-02-01 03:04:51 -0800169 return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170}
171
172static inline void log_set_bit(struct log_c *l,
173 uint32_t *bs, unsigned bit)
174{
Patrick Caulfielda4fc4712006-02-01 03:04:51 -0800175 ext2_set_bit(bit, (unsigned long *) bs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 l->touched = 1;
177}
178
179static inline void log_clear_bit(struct log_c *l,
180 uint32_t *bs, unsigned bit)
181{
Patrick Caulfielda4fc4712006-02-01 03:04:51 -0800182 ext2_clear_bit(bit, (unsigned long *) bs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183 l->touched = 1;
184}
185
186/*----------------------------------------------------------------
187 * Header IO
188 *--------------------------------------------------------------*/
189static void header_to_disk(struct log_header *core, struct log_header *disk)
190{
191 disk->magic = cpu_to_le32(core->magic);
192 disk->version = cpu_to_le32(core->version);
193 disk->nr_regions = cpu_to_le64(core->nr_regions);
194}
195
196static void header_from_disk(struct log_header *core, struct log_header *disk)
197{
198 core->magic = le32_to_cpu(disk->magic);
199 core->version = le32_to_cpu(disk->version);
200 core->nr_regions = le64_to_cpu(disk->nr_regions);
201}
202
203static int read_header(struct log_c *log)
204{
205 int r;
206 unsigned long ebits;
207
208 r = dm_io_sync_vm(1, &log->header_location, READ,
209 log->disk_header, &ebits);
210 if (r)
211 return r;
212
213 header_from_disk(&log->header, log->disk_header);
214
215 /* New log required? */
216 if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) {
217 log->header.magic = MIRROR_MAGIC;
218 log->header.version = MIRROR_DISK_VERSION;
219 log->header.nr_regions = 0;
220 }
221
Patrick Caulfielda4fc4712006-02-01 03:04:51 -0800222#ifdef __LITTLE_ENDIAN
223 if (log->header.version == 1)
224 log->header.version = 2;
225#endif
226
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 if (log->header.version != MIRROR_DISK_VERSION) {
228 DMWARN("incompatible disk log version");
229 return -EINVAL;
230 }
231
232 return 0;
233}
234
235static inline int write_header(struct log_c *log)
236{
237 unsigned long ebits;
238
239 header_to_disk(&log->header, log->disk_header);
240 return dm_io_sync_vm(1, &log->header_location, WRITE,
241 log->disk_header, &ebits);
242}
243
244/*----------------------------------------------------------------
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 * core log constructor/destructor
246 *
247 * argv contains region_size followed optionally by [no]sync
248 *--------------------------------------------------------------*/
249#define BYTE_SHIFT 3
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700250static int create_log_context(struct dirty_log *log, struct dm_target *ti,
251 unsigned int argc, char **argv,
252 struct dm_dev *dev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253{
254 enum sync sync = DEFAULTSYNC;
255
256 struct log_c *lc;
257 uint32_t region_size;
258 unsigned int region_count;
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700259 size_t bitset_size, buf_size;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260
261 if (argc < 1 || argc > 2) {
262 DMWARN("wrong number of arguments to mirror log");
263 return -EINVAL;
264 }
265
266 if (argc > 1) {
267 if (!strcmp(argv[1], "sync"))
268 sync = FORCESYNC;
269 else if (!strcmp(argv[1], "nosync"))
270 sync = NOSYNC;
271 else {
272 DMWARN("unrecognised sync argument to mirror log: %s",
273 argv[1]);
274 return -EINVAL;
275 }
276 }
277
278 if (sscanf(argv[0], "%u", &region_size) != 1) {
279 DMWARN("invalid region size string");
280 return -EINVAL;
281 }
282
283 region_count = dm_sector_div_up(ti->len, region_size);
284
285 lc = kmalloc(sizeof(*lc), GFP_KERNEL);
286 if (!lc) {
287 DMWARN("couldn't allocate core log");
288 return -ENOMEM;
289 }
290
291 lc->ti = ti;
292 lc->touched = 0;
293 lc->region_size = region_size;
294 lc->region_count = region_count;
295 lc->sync = sync;
296
297 /*
Alasdair G Kergon0e568222005-11-21 21:32:34 -0800298 * Work out how many "unsigned long"s we need to hold the bitset.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 */
300 bitset_size = dm_round_up(region_count,
Alasdair G Kergon29121bd2006-06-26 00:27:29 -0700301 sizeof(*lc->clean_bits) << BYTE_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 bitset_size >>= BYTE_SHIFT;
303
Alasdair G Kergon29121bd2006-06-26 00:27:29 -0700304 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits);
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700305
306 /*
307 * Disk log?
308 */
309 if (!dev) {
310 lc->clean_bits = vmalloc(bitset_size);
311 if (!lc->clean_bits) {
312 DMWARN("couldn't allocate clean bitset");
313 kfree(lc);
314 return -ENOMEM;
315 }
316 lc->disk_header = NULL;
317 } else {
318 lc->log_dev = dev;
Jonathan E Brassow01d03a62007-05-09 02:32:57 -0700319 lc->log_dev_failed = 0;
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700320 lc->header_location.bdev = lc->log_dev->bdev;
321 lc->header_location.sector = 0;
322
323 /*
324 * Buffer holds both header and bitset.
325 */
326 buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) +
327 bitset_size, ti->limits.hardsect_size);
328 lc->header_location.count = buf_size >> SECTOR_SHIFT;
329
330 lc->disk_header = vmalloc(buf_size);
331 if (!lc->disk_header) {
332 DMWARN("couldn't allocate disk log buffer");
333 kfree(lc);
334 return -ENOMEM;
335 }
336
337 lc->clean_bits = (void *)lc->disk_header +
338 (LOG_OFFSET << SECTOR_SHIFT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 }
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700340
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341 memset(lc->clean_bits, -1, bitset_size);
342
343 lc->sync_bits = vmalloc(bitset_size);
344 if (!lc->sync_bits) {
345 DMWARN("couldn't allocate sync bitset");
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700346 if (!dev)
347 vfree(lc->clean_bits);
348 vfree(lc->disk_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 kfree(lc);
350 return -ENOMEM;
351 }
352 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size);
353 lc->sync_count = (sync == NOSYNC) ? region_count : 0;
354
355 lc->recovering_bits = vmalloc(bitset_size);
356 if (!lc->recovering_bits) {
357 DMWARN("couldn't allocate sync bitset");
358 vfree(lc->sync_bits);
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700359 if (!dev)
360 vfree(lc->clean_bits);
361 vfree(lc->disk_header);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 kfree(lc);
363 return -ENOMEM;
364 }
365 memset(lc->recovering_bits, 0, bitset_size);
366 lc->sync_search = 0;
367 log->context = lc;
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700368
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 return 0;
370}
371
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700372static int core_ctr(struct dirty_log *log, struct dm_target *ti,
373 unsigned int argc, char **argv)
374{
375 return create_log_context(log, ti, argc, argv, NULL);
376}
377
378static void destroy_log_context(struct log_c *lc)
379{
380 vfree(lc->sync_bits);
381 vfree(lc->recovering_bits);
382 kfree(lc);
383}
384
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385static void core_dtr(struct dirty_log *log)
386{
387 struct log_c *lc = (struct log_c *) log->context;
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389 vfree(lc->clean_bits);
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700390 destroy_log_context(lc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391}
392
393/*----------------------------------------------------------------
394 * disk log constructor/destructor
395 *
396 * argv contains log_device region_size followed optionally by [no]sync
397 *--------------------------------------------------------------*/
398static int disk_ctr(struct dirty_log *log, struct dm_target *ti,
399 unsigned int argc, char **argv)
400{
401 int r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 struct dm_dev *dev;
403
404 if (argc < 2 || argc > 3) {
405 DMWARN("wrong number of arguments to disk mirror log");
406 return -EINVAL;
407 }
408
409 r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */,
410 FMODE_READ | FMODE_WRITE, &dev);
411 if (r)
412 return r;
413
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700414 r = create_log_context(log, ti, argc - 1, argv + 1, dev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 if (r) {
416 dm_put_device(ti, dev);
417 return r;
418 }
419
Linus Torvalds1da177e2005-04-16 15:20:36 -0700420 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421}
422
423static void disk_dtr(struct dirty_log *log)
424{
425 struct log_c *lc = (struct log_c *) log->context;
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700426
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 dm_put_device(lc->ti, lc->log_dev);
428 vfree(lc->disk_header);
Alasdair G Kergonb7cca192006-06-26 00:27:29 -0700429 destroy_log_context(lc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430}
431
432static int count_bits32(uint32_t *addr, unsigned size)
433{
434 int count = 0, i;
435
436 for (i = 0; i < size; i++) {
437 count += hweight32(*(addr+i));
438 }
439 return count;
440}
441
Jonathan E Brassow01d03a62007-05-09 02:32:57 -0700442static void fail_log_device(struct log_c *lc)
443{
444 if (lc->log_dev_failed)
445 return;
446
447 lc->log_dev_failed = 1;
448 dm_table_event(lc->ti->table);
449}
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451static int disk_resume(struct dirty_log *log)
452{
453 int r;
454 unsigned i;
455 struct log_c *lc = (struct log_c *) log->context;
456 size_t size = lc->bitset_uint32_count * sizeof(uint32_t);
457
458 /* read the disk header */
459 r = read_header(lc);
Jonathan E Brassow01d03a62007-05-09 02:32:57 -0700460 if (r) {
461 DMWARN("%s: Failed to read header on mirror log device",
462 lc->log_dev->name);
463 fail_log_device(lc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 return r;
Jonathan E Brassow01d03a62007-05-09 02:32:57 -0700465 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466
Alasdair G Kergon8a835f12006-06-26 00:27:30 -0700467 /* set or clear any new bits -- device has grown */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 if (lc->sync == NOSYNC)
469 for (i = lc->header.nr_regions; i < lc->region_count; i++)
470 /* FIXME: amazingly inefficient */
471 log_set_bit(lc, lc->clean_bits, i);
472 else
473 for (i = lc->header.nr_regions; i < lc->region_count; i++)
474 /* FIXME: amazingly inefficient */
475 log_clear_bit(lc, lc->clean_bits, i);
476
Alasdair G Kergon8a835f12006-06-26 00:27:30 -0700477 /* clear any old bits -- device has shrunk */
478 for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++)
479 log_clear_bit(lc, lc->clean_bits, i);
480
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 /* copy clean across to sync */
482 memcpy(lc->sync_bits, lc->clean_bits, size);
483 lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count);
Jonathan E Brassow88b20a12006-12-08 02:41:12 -0800484 lc->sync_search = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 /* set the correct number of regions in the header */
487 lc->header.nr_regions = lc->region_count;
488
489 /* write the new header */
Jonathan E Brassow01d03a62007-05-09 02:32:57 -0700490 r = write_header(lc);
491 if (r) {
492 DMWARN("%s: Failed to write header on mirror log device",
493 lc->log_dev->name);
494 fail_log_device(lc);
495 }
496
497 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498}
499
500static uint32_t core_get_region_size(struct dirty_log *log)
501{
502 struct log_c *lc = (struct log_c *) log->context;
503 return lc->region_size;
504}
505
Jonathan E Brassow88b20a12006-12-08 02:41:12 -0800506static int core_resume(struct dirty_log *log)
507{
508 struct log_c *lc = (struct log_c *) log->context;
509 lc->sync_search = 0;
510 return 0;
511}
512
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513static int core_is_clean(struct dirty_log *log, region_t region)
514{
515 struct log_c *lc = (struct log_c *) log->context;
516 return log_test_bit(lc->clean_bits, region);
517}
518
519static int core_in_sync(struct dirty_log *log, region_t region, int block)
520{
521 struct log_c *lc = (struct log_c *) log->context;
522 return log_test_bit(lc->sync_bits, region);
523}
524
525static int core_flush(struct dirty_log *log)
526{
527 /* no op */
528 return 0;
529}
530
531static int disk_flush(struct dirty_log *log)
532{
533 int r;
534 struct log_c *lc = (struct log_c *) log->context;
535
536 /* only write if the log has changed */
537 if (!lc->touched)
538 return 0;
539
Kevin Corry702ca6f2006-06-26 00:27:28 -0700540 r = write_header(lc);
Jonathan E Brassow01d03a62007-05-09 02:32:57 -0700541 if (r)
542 fail_log_device(lc);
543 else
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 lc->touched = 0;
545
546 return r;
547}
548
549static void core_mark_region(struct dirty_log *log, region_t region)
550{
551 struct log_c *lc = (struct log_c *) log->context;
552 log_clear_bit(lc, lc->clean_bits, region);
553}
554
555static void core_clear_region(struct dirty_log *log, region_t region)
556{
557 struct log_c *lc = (struct log_c *) log->context;
558 log_set_bit(lc, lc->clean_bits, region);
559}
560
561static int core_get_resync_work(struct dirty_log *log, region_t *region)
562{
563 struct log_c *lc = (struct log_c *) log->context;
564
565 if (lc->sync_search >= lc->region_count)
566 return 0;
567
568 do {
Stefan Bader1113a7e2006-02-02 14:28:07 -0800569 *region = ext2_find_next_zero_bit(
570 (unsigned long *) lc->sync_bits,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 lc->region_count,
572 lc->sync_search);
573 lc->sync_search = *region + 1;
574
Darrick J. Wongac81b2e2006-01-06 00:20:11 -0800575 if (*region >= lc->region_count)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 return 0;
577
578 } while (log_test_bit(lc->recovering_bits, *region));
579
580 log_set_bit(lc, lc->recovering_bits, *region);
581 return 1;
582}
583
Jonathan E Brassowf3ee6b22006-12-08 02:41:11 -0800584static void core_set_region_sync(struct dirty_log *log, region_t region,
585 int in_sync)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586{
587 struct log_c *lc = (struct log_c *) log->context;
588
589 log_clear_bit(lc, lc->recovering_bits, region);
Jonathan E Brassowf3ee6b22006-12-08 02:41:11 -0800590 if (in_sync) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700591 log_set_bit(lc, lc->sync_bits, region);
592 lc->sync_count++;
Jonathan E Brassowf3ee6b22006-12-08 02:41:11 -0800593 } else if (log_test_bit(lc->sync_bits, region)) {
594 lc->sync_count--;
595 log_clear_bit(lc, lc->sync_bits, region);
596 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700597}
598
599static region_t core_get_sync_count(struct dirty_log *log)
600{
601 struct log_c *lc = (struct log_c *) log->context;
602
603 return lc->sync_count;
604}
605
606#define DMEMIT_SYNC \
607 if (lc->sync != DEFAULTSYNC) \
608 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "")
609
610static int core_status(struct dirty_log *log, status_type_t status,
611 char *result, unsigned int maxlen)
612{
613 int sz = 0;
614 struct log_c *lc = log->context;
615
616 switch(status) {
617 case STATUSTYPE_INFO:
618 break;
619
620 case STATUSTYPE_TABLE:
621 DMEMIT("%s %u %u ", log->type->name,
622 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size);
623 DMEMIT_SYNC;
624 }
625
626 return sz;
627}
628
629static int disk_status(struct dirty_log *log, status_type_t status,
630 char *result, unsigned int maxlen)
631{
632 int sz = 0;
633 char buffer[16];
634 struct log_c *lc = log->context;
635
636 switch(status) {
637 case STATUSTYPE_INFO:
638 break;
639
640 case STATUSTYPE_TABLE:
641 format_dev_t(buffer, lc->log_dev->bdev->bd_dev);
642 DMEMIT("%s %u %s %u ", log->type->name,
643 lc->sync == DEFAULTSYNC ? 2 : 3, buffer,
644 lc->region_size);
645 DMEMIT_SYNC;
646 }
647
648 return sz;
649}
650
651static struct dirty_log_type _core_type = {
652 .name = "core",
653 .module = THIS_MODULE,
654 .ctr = core_ctr,
655 .dtr = core_dtr,
Jonathan E Brassow88b20a12006-12-08 02:41:12 -0800656 .resume = core_resume,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700657 .get_region_size = core_get_region_size,
658 .is_clean = core_is_clean,
659 .in_sync = core_in_sync,
660 .flush = core_flush,
661 .mark_region = core_mark_region,
662 .clear_region = core_clear_region,
663 .get_resync_work = core_get_resync_work,
Jonathan E Brassowf3ee6b22006-12-08 02:41:11 -0800664 .set_region_sync = core_set_region_sync,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 .get_sync_count = core_get_sync_count,
666 .status = core_status,
667};
668
669static struct dirty_log_type _disk_type = {
670 .name = "disk",
671 .module = THIS_MODULE,
672 .ctr = disk_ctr,
673 .dtr = disk_dtr,
674 .suspend = disk_flush,
675 .resume = disk_resume,
676 .get_region_size = core_get_region_size,
677 .is_clean = core_is_clean,
678 .in_sync = core_in_sync,
679 .flush = disk_flush,
680 .mark_region = core_mark_region,
681 .clear_region = core_clear_region,
682 .get_resync_work = core_get_resync_work,
Jonathan E Brassowf3ee6b22006-12-08 02:41:11 -0800683 .set_region_sync = core_set_region_sync,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700684 .get_sync_count = core_get_sync_count,
685 .status = disk_status,
686};
687
688int __init dm_dirty_log_init(void)
689{
690 int r;
691
692 r = dm_register_dirty_log_type(&_core_type);
693 if (r)
694 DMWARN("couldn't register core log");
695
696 r = dm_register_dirty_log_type(&_disk_type);
697 if (r) {
698 DMWARN("couldn't register disk type");
699 dm_unregister_dirty_log_type(&_core_type);
700 }
701
702 return r;
703}
704
705void dm_dirty_log_exit(void)
706{
707 dm_unregister_dirty_log_type(&_disk_type);
708 dm_unregister_dirty_log_type(&_core_type);
709}
710
711EXPORT_SYMBOL(dm_register_dirty_log_type);
712EXPORT_SYMBOL(dm_unregister_dirty_log_type);
713EXPORT_SYMBOL(dm_create_dirty_log);
714EXPORT_SYMBOL(dm_destroy_dirty_log);