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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2003 Sistina Software
4 * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved.
5 *
6 * This file is released under the LGPL.
7 */
8
9#include <linux/init.h>
10#include <linux/slab.h>
11#include <linux/module.h>
12#include <linux/vmalloc.h>
13#include <linux/dm-io.h>
14#include <linux/dm-dirty-log.h>
15
16#include <linux/device-mapper.h>
17
18#define DM_MSG_PREFIX "dirty region log"
19
20static LIST_HEAD(_log_types);
21static DEFINE_SPINLOCK(_lock);
22
23static struct dm_dirty_log_type *__find_dirty_log_type(const char *name)
24{
25 struct dm_dirty_log_type *log_type;
26
27 list_for_each_entry(log_type, &_log_types, list)
28 if (!strcmp(name, log_type->name))
29 return log_type;
30
31 return NULL;
32}
33
34static struct dm_dirty_log_type *_get_dirty_log_type(const char *name)
35{
36 struct dm_dirty_log_type *log_type;
37
38 spin_lock(&_lock);
39
40 log_type = __find_dirty_log_type(name);
41 if (log_type && !try_module_get(log_type->module))
42 log_type = NULL;
43
44 spin_unlock(&_lock);
45
46 return log_type;
47}
48
49/*
50 * get_type
51 * @type_name
52 *
53 * Attempt to retrieve the dm_dirty_log_type by name. If not already
54 * available, attempt to load the appropriate module.
55 *
56 * Log modules are named "dm-log-" followed by the 'type_name'.
57 * Modules may contain multiple types.
58 * This function will first try the module "dm-log-<type_name>",
59 * then truncate 'type_name' on the last '-' and try again.
60 *
61 * For example, if type_name was "clustered-disk", it would search
62 * 'dm-log-clustered-disk' then 'dm-log-clustered'.
63 *
64 * Returns: dirty_log_type* on success, NULL on failure
65 */
66static struct dm_dirty_log_type *get_type(const char *type_name)
67{
68 char *p, *type_name_dup;
69 struct dm_dirty_log_type *log_type;
70
71 if (!type_name)
72 return NULL;
73
74 log_type = _get_dirty_log_type(type_name);
75 if (log_type)
76 return log_type;
77
78 type_name_dup = kstrdup(type_name, GFP_KERNEL);
79 if (!type_name_dup) {
80 DMWARN("No memory left to attempt log module load for \"%s\"",
81 type_name);
82 return NULL;
83 }
84
85 while (request_module("dm-log-%s", type_name_dup) ||
86 !(log_type = _get_dirty_log_type(type_name))) {
87 p = strrchr(type_name_dup, '-');
88 if (!p)
89 break;
90 p[0] = '\0';
91 }
92
93 if (!log_type)
94 DMWARN("Module for logging type \"%s\" not found.", type_name);
95
96 kfree(type_name_dup);
97
98 return log_type;
99}
100
101static void put_type(struct dm_dirty_log_type *type)
102{
103 if (!type)
104 return;
105
106 spin_lock(&_lock);
107 if (!__find_dirty_log_type(type->name))
108 goto out;
109
110 module_put(type->module);
111
112out:
113 spin_unlock(&_lock);
114}
115
116int dm_dirty_log_type_register(struct dm_dirty_log_type *type)
117{
118 int r = 0;
119
120 spin_lock(&_lock);
121 if (!__find_dirty_log_type(type->name))
122 list_add(&type->list, &_log_types);
123 else
124 r = -EBUSY;
125 spin_unlock(&_lock);
126
127 return r;
128}
129EXPORT_SYMBOL(dm_dirty_log_type_register);
130
131int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type)
132{
133 spin_lock(&_lock);
134
135 if (!__find_dirty_log_type(type->name)) {
136 spin_unlock(&_lock);
137 return -EINVAL;
138 }
139
140 list_del(&type->list);
141
142 spin_unlock(&_lock);
143
144 return 0;
145}
146EXPORT_SYMBOL(dm_dirty_log_type_unregister);
147
148struct dm_dirty_log *dm_dirty_log_create(const char *type_name,
149 struct dm_target *ti,
150 int (*flush_callback_fn)(struct dm_target *ti),
151 unsigned int argc, char **argv)
152{
153 struct dm_dirty_log_type *type;
154 struct dm_dirty_log *log;
155
156 log = kmalloc_obj(*log);
157 if (!log)
158 return NULL;
159
160 type = get_type(type_name);
161 if (!type) {
162 kfree(log);
163 return NULL;
164 }
165
166 log->flush_callback_fn = flush_callback_fn;
167 log->type = type;
168 if (type->ctr(log, ti, argc, argv)) {
169 kfree(log);
170 put_type(type);
171 return NULL;
172 }
173
174 return log;
175}
176EXPORT_SYMBOL(dm_dirty_log_create);
177
178void dm_dirty_log_destroy(struct dm_dirty_log *log)
179{
180 log->type->dtr(log);
181 put_type(log->type);
182 kfree(log);
183}
184EXPORT_SYMBOL(dm_dirty_log_destroy);
185
186/*
187 *---------------------------------------------------------------
188 * Persistent and core logs share a lot of their implementation.
189 * FIXME: need a reload method to be called from a resume
190 *---------------------------------------------------------------
191 */
192/*
193 * Magic for persistent mirrors: "MiRr"
194 */
195#define MIRROR_MAGIC 0x4D695272
196
197/*
198 * The on-disk version of the metadata.
199 */
200#define MIRROR_DISK_VERSION 2
201#define LOG_OFFSET 2
202
203struct log_header_disk {
204 __le32 magic;
205
206 /*
207 * Simple, incrementing version. no backward
208 * compatibility.
209 */
210 __le32 version;
211 __le64 nr_regions;
212} __packed;
213
214struct log_header_core {
215 uint32_t magic;
216 uint32_t version;
217 uint64_t nr_regions;
218};
219
220struct log_c {
221 struct dm_target *ti;
222 int touched_dirtied;
223 int touched_cleaned;
224 int flush_failed;
225 uint32_t region_size;
226 unsigned int region_count;
227 region_t sync_count;
228
229 unsigned int bitset_uint32_count;
230 uint32_t *clean_bits;
231 uint32_t *sync_bits;
232 uint32_t *recovering_bits; /* FIXME: this seems excessive */
233
234 int sync_search;
235
236 /* Resync flag */
237 enum sync {
238 DEFAULTSYNC, /* Synchronize if necessary */
239 NOSYNC, /* Devices known to be already in sync */
240 FORCESYNC, /* Force a sync to happen */
241 } sync;
242
243 struct dm_io_request io_req;
244
245 /*
246 * Disk log fields
247 */
248 int log_dev_failed;
249 int log_dev_flush_failed;
250 struct dm_dev *log_dev;
251 struct log_header_core header;
252
253 struct dm_io_region header_location;
254 struct log_header_disk *disk_header;
255};
256
257/*
258 * The touched member needs to be updated every time we access
259 * one of the bitsets.
260 */
261static inline int log_test_bit(uint32_t *bs, unsigned int bit)
262{
263 return test_bit_le(bit, bs) ? 1 : 0;
264}
265
266static inline void log_set_bit(struct log_c *l,
267 uint32_t *bs, unsigned int bit)
268{
269 __set_bit_le(bit, bs);
270 l->touched_cleaned = 1;
271}
272
273static inline void log_clear_bit(struct log_c *l,
274 uint32_t *bs, unsigned int bit)
275{
276 __clear_bit_le(bit, bs);
277 l->touched_dirtied = 1;
278}
279
280/*
281 *---------------------------------------------------------------
282 * Header IO
283 *--------------------------------------------------------------
284 */
285static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk)
286{
287 disk->magic = cpu_to_le32(core->magic);
288 disk->version = cpu_to_le32(core->version);
289 disk->nr_regions = cpu_to_le64(core->nr_regions);
290}
291
292static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk)
293{
294 core->magic = le32_to_cpu(disk->magic);
295 core->version = le32_to_cpu(disk->version);
296 core->nr_regions = le64_to_cpu(disk->nr_regions);
297}
298
299static int rw_header(struct log_c *lc, enum req_op op)
300{
301 lc->io_req.bi_opf = op;
302
303 return dm_io(&lc->io_req, 1, &lc->header_location, NULL, NULL, IOPRIO_DEFAULT);
304}
305
306static int flush_header(struct log_c *lc)
307{
308 struct dm_io_region null_location = {
309 .bdev = lc->header_location.bdev,
310 .sector = 0,
311 .count = 0,
312 };
313
314 lc->io_req.bi_opf = REQ_OP_WRITE | REQ_PREFLUSH;
315
316 return dm_io(&lc->io_req, 1, &null_location, NULL, NULL, IOPRIO_DEFAULT);
317}
318
319static int read_header(struct log_c *log)
320{
321 int r;
322
323 r = rw_header(log, REQ_OP_READ);
324 if (r)
325 return r;
326
327 header_from_disk(&log->header, log->disk_header);
328
329 /* New log required? */
330 if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) {
331 log->header.magic = MIRROR_MAGIC;
332 log->header.version = MIRROR_DISK_VERSION;
333 log->header.nr_regions = 0;
334 }
335
336#ifdef __LITTLE_ENDIAN
337 if (log->header.version == 1)
338 log->header.version = 2;
339#endif
340
341 if (log->header.version != MIRROR_DISK_VERSION) {
342 DMWARN("incompatible disk log version");
343 return -EINVAL;
344 }
345
346 return 0;
347}
348
349static int _check_region_size(struct dm_target *ti, uint32_t region_size)
350{
351 if (region_size < 2 || region_size > ti->len)
352 return 0;
353
354 if (!is_power_of_2(region_size))
355 return 0;
356
357 return 1;
358}
359
360/*
361 *--------------------------------------------------------------
362 * core log constructor/destructor
363 *
364 * argv contains region_size followed optionally by [no]sync
365 *--------------------------------------------------------------
366 */
367#define BYTE_SHIFT 3
368static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti,
369 unsigned int argc, char **argv,
370 struct dm_dev *dev)
371{
372 enum sync sync = DEFAULTSYNC;
373
374 struct log_c *lc;
375 uint32_t region_size;
376 sector_t region_count;
377 size_t bitset_size, buf_size;
378 int r;
379 char dummy;
380
381 if (argc < 1 || argc > 2) {
382 DMWARN("wrong number of arguments to dirty region log");
383 return -EINVAL;
384 }
385
386 if (argc > 1) {
387 if (!strcmp(argv[1], "sync"))
388 sync = FORCESYNC;
389 else if (!strcmp(argv[1], "nosync"))
390 sync = NOSYNC;
391 else {
392 DMWARN("unrecognised sync argument to dirty region log: %s", argv[1]);
393 return -EINVAL;
394 }
395 }
396
397 if (sscanf(argv[0], "%u%c", &region_size, &dummy) != 1 ||
398 !_check_region_size(ti, region_size)) {
399 DMWARN("invalid region size %s", argv[0]);
400 return -EINVAL;
401 }
402
403 region_count = dm_sector_div_up(ti->len, region_size);
404 if (region_count > UINT_MAX) {
405 DMWARN("region count exceeds limit of %u", UINT_MAX);
406 return -EINVAL;
407 }
408
409 lc = kmalloc_obj(*lc);
410 if (!lc) {
411 DMWARN("couldn't allocate core log");
412 return -ENOMEM;
413 }
414
415 lc->ti = ti;
416 lc->touched_dirtied = 0;
417 lc->touched_cleaned = 0;
418 lc->flush_failed = 0;
419 lc->region_size = region_size;
420 lc->region_count = region_count;
421 lc->sync = sync;
422
423 /*
424 * Work out how many "unsigned long"s we need to hold the bitset.
425 */
426 bitset_size = dm_round_up(region_count, BITS_PER_LONG);
427 bitset_size >>= BYTE_SHIFT;
428 /* Handle dm_round_up rollover on 32-bit systems */
429 if (!bitset_size)
430 bitset_size = 1UL << (BITS_PER_LONG - BYTE_SHIFT);
431
432 lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits);
433
434 /*
435 * Disk log?
436 */
437 if (!dev) {
438 lc->clean_bits = vmalloc(bitset_size);
439 if (!lc->clean_bits) {
440 DMWARN("couldn't allocate clean bitset");
441 kfree(lc);
442 return -ENOMEM;
443 }
444 lc->disk_header = NULL;
445 } else {
446 lc->log_dev = dev;
447 lc->log_dev_failed = 0;
448 lc->log_dev_flush_failed = 0;
449 lc->header_location.bdev = lc->log_dev->bdev;
450 lc->header_location.sector = 0;
451
452 /*
453 * Buffer holds both header and bitset.
454 */
455 buf_size =
456 dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size,
457 bdev_logical_block_size(lc->header_location.bdev));
458
459 if (buf_size > bdev_nr_bytes(dev->bdev)) {
460 DMWARN("log device %s too small: need %llu bytes",
461 dev->name, (unsigned long long)buf_size);
462 kfree(lc);
463 return -EINVAL;
464 }
465
466 lc->header_location.count = buf_size >> SECTOR_SHIFT;
467
468 lc->io_req.mem.type = DM_IO_VMA;
469 lc->io_req.notify.fn = NULL;
470 lc->io_req.client = dm_io_client_create();
471 if (IS_ERR(lc->io_req.client)) {
472 r = PTR_ERR(lc->io_req.client);
473 DMWARN("couldn't allocate disk io client");
474 kfree(lc);
475 return r;
476 }
477
478 lc->disk_header = vmalloc(buf_size);
479 if (!lc->disk_header) {
480 DMWARN("couldn't allocate disk log buffer");
481 dm_io_client_destroy(lc->io_req.client);
482 kfree(lc);
483 return -ENOMEM;
484 }
485
486 lc->io_req.mem.ptr.vma = lc->disk_header;
487 lc->clean_bits = (void *)lc->disk_header +
488 (LOG_OFFSET << SECTOR_SHIFT);
489 }
490
491 memset(lc->clean_bits, -1, bitset_size);
492
493 lc->sync_bits = vmalloc(bitset_size);
494 if (!lc->sync_bits) {
495 DMWARN("couldn't allocate sync bitset");
496 if (!dev)
497 vfree(lc->clean_bits);
498 else
499 dm_io_client_destroy(lc->io_req.client);
500 vfree(lc->disk_header);
501 kfree(lc);
502 return -ENOMEM;
503 }
504 memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size);
505 lc->sync_count = (sync == NOSYNC) ? region_count : 0;
506
507 lc->recovering_bits = vzalloc(bitset_size);
508 if (!lc->recovering_bits) {
509 DMWARN("couldn't allocate sync bitset");
510 vfree(lc->sync_bits);
511 if (!dev)
512 vfree(lc->clean_bits);
513 else
514 dm_io_client_destroy(lc->io_req.client);
515 vfree(lc->disk_header);
516 kfree(lc);
517 return -ENOMEM;
518 }
519 lc->sync_search = 0;
520 log->context = lc;
521
522 return 0;
523}
524
525static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti,
526 unsigned int argc, char **argv)
527{
528 return create_log_context(log, ti, argc, argv, NULL);
529}
530
531static void destroy_log_context(struct log_c *lc)
532{
533 vfree(lc->sync_bits);
534 vfree(lc->recovering_bits);
535 kfree(lc);
536}
537
538static void core_dtr(struct dm_dirty_log *log)
539{
540 struct log_c *lc = log->context;
541
542 vfree(lc->clean_bits);
543 destroy_log_context(lc);
544}
545
546/*
547 *---------------------------------------------------------------------
548 * disk log constructor/destructor
549 *
550 * argv contains log_device region_size followed optionally by [no]sync
551 *---------------------------------------------------------------------
552 */
553static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti,
554 unsigned int argc, char **argv)
555{
556 int r;
557 struct dm_dev *dev;
558
559 if (argc < 2 || argc > 3) {
560 DMWARN("wrong number of arguments to disk dirty region log");
561 return -EINVAL;
562 }
563
564 r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev);
565 if (r)
566 return r;
567
568 r = create_log_context(log, ti, argc - 1, argv + 1, dev);
569 if (r) {
570 dm_put_device(ti, dev);
571 return r;
572 }
573
574 return 0;
575}
576
577static void disk_dtr(struct dm_dirty_log *log)
578{
579 struct log_c *lc = log->context;
580
581 dm_put_device(lc->ti, lc->log_dev);
582 vfree(lc->disk_header);
583 dm_io_client_destroy(lc->io_req.client);
584 destroy_log_context(lc);
585}
586
587static void fail_log_device(struct log_c *lc)
588{
589 if (lc->log_dev_failed)
590 return;
591
592 lc->log_dev_failed = 1;
593 dm_table_event(lc->ti->table);
594}
595
596static int disk_resume(struct dm_dirty_log *log)
597{
598 int r;
599 unsigned int i;
600 struct log_c *lc = log->context;
601 size_t size = lc->bitset_uint32_count * sizeof(uint32_t);
602
603 /* read the disk header */
604 r = read_header(lc);
605 if (r) {
606 DMWARN("%s: Failed to read header on dirty region log device",
607 lc->log_dev->name);
608 fail_log_device(lc);
609 /*
610 * If the log device cannot be read, we must assume
611 * all regions are out-of-sync. If we simply return
612 * here, the state will be uninitialized and could
613 * lead us to return 'in-sync' status for regions
614 * that are actually 'out-of-sync'.
615 */
616 lc->header.nr_regions = 0;
617 }
618
619 /* set or clear any new bits -- device has grown */
620 if (lc->sync == NOSYNC)
621 for (i = lc->header.nr_regions; i < lc->region_count; i++)
622 /* FIXME: amazingly inefficient */
623 log_set_bit(lc, lc->clean_bits, i);
624 else
625 for (i = lc->header.nr_regions; i < lc->region_count; i++)
626 /* FIXME: amazingly inefficient */
627 log_clear_bit(lc, lc->clean_bits, i);
628
629 /* clear any old bits -- device has shrunk */
630 for (i = lc->region_count; i % BITS_PER_LONG; i++)
631 log_clear_bit(lc, lc->clean_bits, i);
632
633 /* copy clean across to sync */
634 memcpy(lc->sync_bits, lc->clean_bits, size);
635 lc->sync_count = memweight(lc->clean_bits,
636 lc->bitset_uint32_count * sizeof(uint32_t));
637 lc->sync_search = 0;
638
639 /* set the correct number of regions in the header */
640 lc->header.nr_regions = lc->region_count;
641
642 header_to_disk(&lc->header, lc->disk_header);
643
644 /* write the new header */
645 r = rw_header(lc, REQ_OP_WRITE);
646 if (!r) {
647 r = flush_header(lc);
648 if (r)
649 lc->log_dev_flush_failed = 1;
650 }
651 if (r) {
652 DMWARN("%s: Failed to write header on dirty region log device",
653 lc->log_dev->name);
654 fail_log_device(lc);
655 }
656
657 return r;
658}
659
660static uint32_t core_get_region_size(struct dm_dirty_log *log)
661{
662 struct log_c *lc = log->context;
663
664 return lc->region_size;
665}
666
667static int core_resume(struct dm_dirty_log *log)
668{
669 struct log_c *lc = log->context;
670
671 lc->sync_search = 0;
672 return 0;
673}
674
675static int core_is_clean(struct dm_dirty_log *log, region_t region)
676{
677 struct log_c *lc = log->context;
678
679 return log_test_bit(lc->clean_bits, region);
680}
681
682static int core_in_sync(struct dm_dirty_log *log, region_t region, int block)
683{
684 struct log_c *lc = log->context;
685
686 return log_test_bit(lc->sync_bits, region);
687}
688
689static int core_flush(struct dm_dirty_log *log)
690{
691 /* no op */
692 return 0;
693}
694
695static int disk_flush(struct dm_dirty_log *log)
696{
697 int r, i;
698 struct log_c *lc = log->context;
699
700 /* only write if the log has changed */
701 if (!lc->touched_cleaned && !lc->touched_dirtied)
702 return 0;
703
704 if (lc->touched_cleaned && log->flush_callback_fn &&
705 log->flush_callback_fn(lc->ti)) {
706 /*
707 * At this point it is impossible to determine which
708 * regions are clean and which are dirty (without
709 * re-reading the log off disk). So mark all of them
710 * dirty.
711 */
712 lc->flush_failed = 1;
713 for (i = 0; i < lc->region_count; i++)
714 log_clear_bit(lc, lc->clean_bits, i);
715 }
716
717 r = rw_header(lc, REQ_OP_WRITE);
718 if (r)
719 fail_log_device(lc);
720 else {
721 if (lc->touched_dirtied) {
722 r = flush_header(lc);
723 if (r) {
724 lc->log_dev_flush_failed = 1;
725 fail_log_device(lc);
726 } else
727 lc->touched_dirtied = 0;
728 }
729 lc->touched_cleaned = 0;
730 }
731
732 return r;
733}
734
735static void core_mark_region(struct dm_dirty_log *log, region_t region)
736{
737 struct log_c *lc = log->context;
738
739 log_clear_bit(lc, lc->clean_bits, region);
740}
741
742static void core_clear_region(struct dm_dirty_log *log, region_t region)
743{
744 struct log_c *lc = log->context;
745
746 if (likely(!lc->flush_failed))
747 log_set_bit(lc, lc->clean_bits, region);
748}
749
750static int core_get_resync_work(struct dm_dirty_log *log, region_t *region)
751{
752 struct log_c *lc = log->context;
753
754 if (lc->sync_search >= lc->region_count)
755 return 0;
756
757 do {
758 *region = find_next_zero_bit_le(lc->sync_bits,
759 lc->region_count,
760 lc->sync_search);
761 lc->sync_search = *region + 1;
762
763 if (*region >= lc->region_count)
764 return 0;
765
766 } while (log_test_bit(lc->recovering_bits, *region));
767
768 log_set_bit(lc, lc->recovering_bits, *region);
769 return 1;
770}
771
772static void core_set_region_sync(struct dm_dirty_log *log, region_t region,
773 int in_sync)
774{
775 struct log_c *lc = log->context;
776
777 log_clear_bit(lc, lc->recovering_bits, region);
778 if (in_sync) {
779 log_set_bit(lc, lc->sync_bits, region);
780 lc->sync_count++;
781 } else if (log_test_bit(lc->sync_bits, region)) {
782 lc->sync_count--;
783 log_clear_bit(lc, lc->sync_bits, region);
784 }
785}
786
787static region_t core_get_sync_count(struct dm_dirty_log *log)
788{
789 struct log_c *lc = log->context;
790
791 return lc->sync_count;
792}
793
794#define DMEMIT_SYNC \
795 do { \
796 if (lc->sync != DEFAULTSYNC) \
797 DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : ""); \
798 } while (0)
799
800static int core_status(struct dm_dirty_log *log, status_type_t status,
801 char *result, unsigned int maxlen)
802{
803 int sz = 0;
804 struct log_c *lc = log->context;
805
806 switch (status) {
807 case STATUSTYPE_INFO:
808 DMEMIT("1 %s", log->type->name);
809 break;
810
811 case STATUSTYPE_TABLE:
812 DMEMIT("%s %u %u ", log->type->name,
813 lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size);
814 DMEMIT_SYNC;
815 break;
816
817 case STATUSTYPE_IMA:
818 *result = '\0';
819 break;
820 }
821
822 return sz;
823}
824
825static int disk_status(struct dm_dirty_log *log, status_type_t status,
826 char *result, unsigned int maxlen)
827{
828 int sz = 0;
829 struct log_c *lc = log->context;
830
831 switch (status) {
832 case STATUSTYPE_INFO:
833 DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name,
834 lc->log_dev_flush_failed ? 'F' :
835 lc->log_dev_failed ? 'D' :
836 'A');
837 break;
838
839 case STATUSTYPE_TABLE:
840 DMEMIT("%s %u %s %u ", log->type->name,
841 lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name,
842 lc->region_size);
843 DMEMIT_SYNC;
844 break;
845
846 case STATUSTYPE_IMA:
847 *result = '\0';
848 break;
849 }
850
851 return sz;
852}
853
854static struct dm_dirty_log_type _core_type = {
855 .name = "core",
856 .module = THIS_MODULE,
857 .ctr = core_ctr,
858 .dtr = core_dtr,
859 .resume = core_resume,
860 .get_region_size = core_get_region_size,
861 .is_clean = core_is_clean,
862 .in_sync = core_in_sync,
863 .flush = core_flush,
864 .mark_region = core_mark_region,
865 .clear_region = core_clear_region,
866 .get_resync_work = core_get_resync_work,
867 .set_region_sync = core_set_region_sync,
868 .get_sync_count = core_get_sync_count,
869 .status = core_status,
870};
871
872static struct dm_dirty_log_type _disk_type = {
873 .name = "disk",
874 .module = THIS_MODULE,
875 .ctr = disk_ctr,
876 .dtr = disk_dtr,
877 .postsuspend = disk_flush,
878 .resume = disk_resume,
879 .get_region_size = core_get_region_size,
880 .is_clean = core_is_clean,
881 .in_sync = core_in_sync,
882 .flush = disk_flush,
883 .mark_region = core_mark_region,
884 .clear_region = core_clear_region,
885 .get_resync_work = core_get_resync_work,
886 .set_region_sync = core_set_region_sync,
887 .get_sync_count = core_get_sync_count,
888 .status = disk_status,
889};
890
891static int __init dm_dirty_log_init(void)
892{
893 int r;
894
895 r = dm_dirty_log_type_register(&_core_type);
896 if (r)
897 DMWARN("couldn't register core log");
898
899 r = dm_dirty_log_type_register(&_disk_type);
900 if (r) {
901 DMWARN("couldn't register disk type");
902 dm_dirty_log_type_unregister(&_core_type);
903 }
904
905 return r;
906}
907
908static void __exit dm_dirty_log_exit(void)
909{
910 dm_dirty_log_type_unregister(&_disk_type);
911 dm_dirty_log_type_unregister(&_core_type);
912}
913
914module_init(dm_dirty_log_init);
915module_exit(dm_dirty_log_exit);
916
917MODULE_DESCRIPTION(DM_NAME " dirty region log");
918MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <[email protected]>");
919MODULE_LICENSE("GPL");