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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 | ||
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 | */ | |
01d03a66 | 155 | int log_dev_failed; |
1da177e4 LT |
156 | struct dm_dev *log_dev; |
157 | struct log_header header; | |
158 | ||
159 | struct io_region header_location; | |
160 | struct log_header *disk_header; | |
1da177e4 LT |
161 | }; |
162 | ||
163 | /* | |
164 | * The touched member needs to be updated every time we access | |
165 | * one of the bitsets. | |
166 | */ | |
167 | static inline int log_test_bit(uint32_t *bs, unsigned bit) | |
168 | { | |
a4fc4717 | 169 | return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; |
1da177e4 LT |
170 | } |
171 | ||
172 | static inline void log_set_bit(struct log_c *l, | |
173 | uint32_t *bs, unsigned bit) | |
174 | { | |
a4fc4717 | 175 | ext2_set_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
176 | l->touched = 1; |
177 | } | |
178 | ||
179 | static inline void log_clear_bit(struct log_c *l, | |
180 | uint32_t *bs, unsigned bit) | |
181 | { | |
a4fc4717 | 182 | ext2_clear_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
183 | l->touched = 1; |
184 | } | |
185 | ||
186 | /*---------------------------------------------------------------- | |
187 | * Header IO | |
188 | *--------------------------------------------------------------*/ | |
189 | static 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 | ||
196 | static 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 | ||
203 | static 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 | ||
a4fc4717 PC |
222 | #ifdef __LITTLE_ENDIAN |
223 | if (log->header.version == 1) | |
224 | log->header.version = 2; | |
225 | #endif | |
226 | ||
1da177e4 LT |
227 | if (log->header.version != MIRROR_DISK_VERSION) { |
228 | DMWARN("incompatible disk log version"); | |
229 | return -EINVAL; | |
230 | } | |
231 | ||
232 | return 0; | |
233 | } | |
234 | ||
235 | static 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 | ||
1da177e4 LT |
244 | /*---------------------------------------------------------------- |
245 | * core log constructor/destructor | |
246 | * | |
247 | * argv contains region_size followed optionally by [no]sync | |
248 | *--------------------------------------------------------------*/ | |
249 | #define BYTE_SHIFT 3 | |
b7cca195 AK |
250 | static int create_log_context(struct dirty_log *log, struct dm_target *ti, |
251 | unsigned int argc, char **argv, | |
252 | struct dm_dev *dev) | |
1da177e4 LT |
253 | { |
254 | enum sync sync = DEFAULTSYNC; | |
255 | ||
256 | struct log_c *lc; | |
257 | uint32_t region_size; | |
258 | unsigned int region_count; | |
b7cca195 | 259 | size_t bitset_size, buf_size; |
1da177e4 LT |
260 | |
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", ®ion_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 | /* | |
0e56822d | 298 | * Work out how many "unsigned long"s we need to hold the bitset. |
1da177e4 LT |
299 | */ |
300 | bitset_size = dm_round_up(region_count, | |
29121bd0 | 301 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
1da177e4 LT |
302 | bitset_size >>= BYTE_SHIFT; |
303 | ||
29121bd0 | 304 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
b7cca195 AK |
305 | |
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; | |
01d03a66 | 319 | lc->log_dev_failed = 0; |
b7cca195 AK |
320 | 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); | |
1da177e4 | 339 | } |
b7cca195 | 340 | |
1da177e4 LT |
341 | 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"); | |
b7cca195 AK |
346 | if (!dev) |
347 | vfree(lc->clean_bits); | |
348 | vfree(lc->disk_header); | |
1da177e4 LT |
349 | 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); | |
b7cca195 AK |
359 | if (!dev) |
360 | vfree(lc->clean_bits); | |
361 | vfree(lc->disk_header); | |
1da177e4 LT |
362 | kfree(lc); |
363 | return -ENOMEM; | |
364 | } | |
365 | memset(lc->recovering_bits, 0, bitset_size); | |
366 | lc->sync_search = 0; | |
367 | log->context = lc; | |
b7cca195 | 368 | |
1da177e4 LT |
369 | return 0; |
370 | } | |
371 | ||
b7cca195 AK |
372 | static 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 | ||
378 | static void destroy_log_context(struct log_c *lc) | |
1da177e4 | 379 | { |
1da177e4 LT |
380 | vfree(lc->sync_bits); |
381 | vfree(lc->recovering_bits); | |
382 | kfree(lc); | |
383 | } | |
384 | ||
b7cca195 AK |
385 | static void core_dtr(struct dirty_log *log) |
386 | { | |
387 | struct log_c *lc = (struct log_c *) log->context; | |
388 | ||
389 | vfree(lc->clean_bits); | |
390 | destroy_log_context(lc); | |
391 | } | |
392 | ||
1da177e4 LT |
393 | /*---------------------------------------------------------------- |
394 | * disk log constructor/destructor | |
395 | * | |
396 | * argv contains log_device region_size followed optionally by [no]sync | |
397 | *--------------------------------------------------------------*/ | |
398 | static int disk_ctr(struct dirty_log *log, struct dm_target *ti, | |
399 | unsigned int argc, char **argv) | |
400 | { | |
401 | int r; | |
1da177e4 LT |
402 | 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 | ||
b7cca195 | 414 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
1da177e4 LT |
415 | if (r) { |
416 | dm_put_device(ti, dev); | |
417 | return r; | |
418 | } | |
419 | ||
1da177e4 | 420 | return 0; |
1da177e4 LT |
421 | } |
422 | ||
423 | static void disk_dtr(struct dirty_log *log) | |
424 | { | |
425 | struct log_c *lc = (struct log_c *) log->context; | |
b7cca195 | 426 | |
1da177e4 LT |
427 | dm_put_device(lc->ti, lc->log_dev); |
428 | vfree(lc->disk_header); | |
b7cca195 | 429 | destroy_log_context(lc); |
1da177e4 LT |
430 | } |
431 | ||
432 | static 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 | ||
01d03a66 JB |
442 | static 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 | ||
1da177e4 LT |
451 | static 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); | |
01d03a66 JB |
460 | if (r) { |
461 | DMWARN("%s: Failed to read header on mirror log device", | |
462 | lc->log_dev->name); | |
463 | fail_log_device(lc); | |
1da177e4 | 464 | return r; |
01d03a66 | 465 | } |
1da177e4 | 466 | |
8a835f11 | 467 | /* set or clear any new bits -- device has grown */ |
1da177e4 LT |
468 | 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 | ||
8a835f11 AK |
477 | /* 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 | ||
1da177e4 LT |
481 | /* 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); | |
88b20a1a | 484 | lc->sync_search = 0; |
1da177e4 | 485 | |
1da177e4 LT |
486 | /* set the correct number of regions in the header */ |
487 | lc->header.nr_regions = lc->region_count; | |
488 | ||
489 | /* write the new header */ | |
01d03a66 JB |
490 | 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; | |
1da177e4 LT |
498 | } |
499 | ||
500 | static 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 | ||
88b20a1a JB |
506 | static 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 | ||
1da177e4 LT |
513 | static 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 | ||
519 | static 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 | ||
525 | static int core_flush(struct dirty_log *log) | |
526 | { | |
527 | /* no op */ | |
528 | return 0; | |
529 | } | |
530 | ||
531 | static 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 | ||
702ca6f0 | 540 | r = write_header(lc); |
01d03a66 JB |
541 | if (r) |
542 | fail_log_device(lc); | |
543 | else | |
1da177e4 LT |
544 | lc->touched = 0; |
545 | ||
546 | return r; | |
547 | } | |
548 | ||
549 | static 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 | ||
555 | static 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 | ||
561 | static 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 { | |
1113a7e9 SB |
569 | *region = ext2_find_next_zero_bit( |
570 | (unsigned long *) lc->sync_bits, | |
1da177e4 LT |
571 | lc->region_count, |
572 | lc->sync_search); | |
573 | lc->sync_search = *region + 1; | |
574 | ||
ac81b2ee | 575 | if (*region >= lc->region_count) |
1da177e4 LT |
576 | 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 | ||
f3ee6b2f JB |
584 | static void core_set_region_sync(struct dirty_log *log, region_t region, |
585 | int in_sync) | |
1da177e4 LT |
586 | { |
587 | struct log_c *lc = (struct log_c *) log->context; | |
588 | ||
589 | log_clear_bit(lc, lc->recovering_bits, region); | |
f3ee6b2f | 590 | if (in_sync) { |
1da177e4 LT |
591 | log_set_bit(lc, lc->sync_bits, region); |
592 | lc->sync_count++; | |
f3ee6b2f JB |
593 | } else if (log_test_bit(lc->sync_bits, region)) { |
594 | lc->sync_count--; | |
595 | log_clear_bit(lc, lc->sync_bits, region); | |
596 | } | |
1da177e4 LT |
597 | } |
598 | ||
599 | static 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 | ||
610 | static 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: | |
315dcc22 | 618 | DMEMIT("1 %s", log->type->name); |
1da177e4 LT |
619 | break; |
620 | ||
621 | case STATUSTYPE_TABLE: | |
622 | DMEMIT("%s %u %u ", log->type->name, | |
623 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); | |
624 | DMEMIT_SYNC; | |
625 | } | |
626 | ||
627 | return sz; | |
628 | } | |
629 | ||
630 | static int disk_status(struct dirty_log *log, status_type_t status, | |
631 | char *result, unsigned int maxlen) | |
632 | { | |
633 | int sz = 0; | |
1da177e4 LT |
634 | struct log_c *lc = log->context; |
635 | ||
636 | switch(status) { | |
637 | case STATUSTYPE_INFO: | |
315dcc22 JB |
638 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
639 | lc->log_dev_failed ? 'D' : 'A'); | |
1da177e4 LT |
640 | break; |
641 | ||
642 | case STATUSTYPE_TABLE: | |
1da177e4 | 643 | DMEMIT("%s %u %s %u ", log->type->name, |
315dcc22 | 644 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
1da177e4 LT |
645 | lc->region_size); |
646 | DMEMIT_SYNC; | |
647 | } | |
648 | ||
649 | return sz; | |
650 | } | |
651 | ||
652 | static struct dirty_log_type _core_type = { | |
653 | .name = "core", | |
654 | .module = THIS_MODULE, | |
655 | .ctr = core_ctr, | |
656 | .dtr = core_dtr, | |
88b20a1a | 657 | .resume = core_resume, |
1da177e4 LT |
658 | .get_region_size = core_get_region_size, |
659 | .is_clean = core_is_clean, | |
660 | .in_sync = core_in_sync, | |
661 | .flush = core_flush, | |
662 | .mark_region = core_mark_region, | |
663 | .clear_region = core_clear_region, | |
664 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 665 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
666 | .get_sync_count = core_get_sync_count, |
667 | .status = core_status, | |
668 | }; | |
669 | ||
670 | static struct dirty_log_type _disk_type = { | |
671 | .name = "disk", | |
672 | .module = THIS_MODULE, | |
673 | .ctr = disk_ctr, | |
674 | .dtr = disk_dtr, | |
675 | .suspend = disk_flush, | |
676 | .resume = disk_resume, | |
677 | .get_region_size = core_get_region_size, | |
678 | .is_clean = core_is_clean, | |
679 | .in_sync = core_in_sync, | |
680 | .flush = disk_flush, | |
681 | .mark_region = core_mark_region, | |
682 | .clear_region = core_clear_region, | |
683 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 684 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
685 | .get_sync_count = core_get_sync_count, |
686 | .status = disk_status, | |
687 | }; | |
688 | ||
689 | int __init dm_dirty_log_init(void) | |
690 | { | |
691 | int r; | |
692 | ||
693 | r = dm_register_dirty_log_type(&_core_type); | |
694 | if (r) | |
695 | DMWARN("couldn't register core log"); | |
696 | ||
697 | r = dm_register_dirty_log_type(&_disk_type); | |
698 | if (r) { | |
699 | DMWARN("couldn't register disk type"); | |
700 | dm_unregister_dirty_log_type(&_core_type); | |
701 | } | |
702 | ||
703 | return r; | |
704 | } | |
705 | ||
706 | void dm_dirty_log_exit(void) | |
707 | { | |
708 | dm_unregister_dirty_log_type(&_disk_type); | |
709 | dm_unregister_dirty_log_type(&_core_type); | |
710 | } | |
711 | ||
712 | EXPORT_SYMBOL(dm_register_dirty_log_type); | |
713 | EXPORT_SYMBOL(dm_unregister_dirty_log_type); | |
714 | EXPORT_SYMBOL(dm_create_dirty_log); | |
715 | EXPORT_SYMBOL(dm_destroy_dirty_log); |