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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 | ||
5d234d1e HM |
152 | struct dm_io_request io_req; |
153 | ||
1da177e4 LT |
154 | /* |
155 | * Disk log fields | |
156 | */ | |
01d03a66 | 157 | int log_dev_failed; |
1da177e4 LT |
158 | struct dm_dev *log_dev; |
159 | struct log_header header; | |
160 | ||
161 | struct io_region header_location; | |
162 | struct log_header *disk_header; | |
1da177e4 LT |
163 | }; |
164 | ||
165 | /* | |
166 | * The touched member needs to be updated every time we access | |
167 | * one of the bitsets. | |
168 | */ | |
169 | static inline int log_test_bit(uint32_t *bs, unsigned bit) | |
170 | { | |
a4fc4717 | 171 | return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; |
1da177e4 LT |
172 | } |
173 | ||
174 | static inline void log_set_bit(struct log_c *l, | |
175 | uint32_t *bs, unsigned bit) | |
176 | { | |
a4fc4717 | 177 | ext2_set_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
178 | l->touched = 1; |
179 | } | |
180 | ||
181 | static inline void log_clear_bit(struct log_c *l, | |
182 | uint32_t *bs, unsigned bit) | |
183 | { | |
a4fc4717 | 184 | ext2_clear_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
185 | l->touched = 1; |
186 | } | |
187 | ||
188 | /*---------------------------------------------------------------- | |
189 | * Header IO | |
190 | *--------------------------------------------------------------*/ | |
191 | static void header_to_disk(struct log_header *core, struct log_header *disk) | |
192 | { | |
193 | disk->magic = cpu_to_le32(core->magic); | |
194 | disk->version = cpu_to_le32(core->version); | |
195 | disk->nr_regions = cpu_to_le64(core->nr_regions); | |
196 | } | |
197 | ||
198 | static void header_from_disk(struct log_header *core, struct log_header *disk) | |
199 | { | |
200 | core->magic = le32_to_cpu(disk->magic); | |
201 | core->version = le32_to_cpu(disk->version); | |
202 | core->nr_regions = le64_to_cpu(disk->nr_regions); | |
203 | } | |
204 | ||
5d234d1e HM |
205 | static int rw_header(struct log_c *lc, int rw) |
206 | { | |
207 | lc->io_req.bi_rw = rw; | |
208 | lc->io_req.mem.ptr.vma = lc->disk_header; | |
209 | lc->io_req.notify.fn = NULL; | |
210 | ||
211 | return dm_io(&lc->io_req, 1, &lc->header_location, NULL); | |
212 | } | |
213 | ||
1da177e4 LT |
214 | static int read_header(struct log_c *log) |
215 | { | |
216 | int r; | |
1da177e4 | 217 | |
5d234d1e | 218 | r = rw_header(log, READ); |
1da177e4 LT |
219 | if (r) |
220 | return r; | |
221 | ||
222 | header_from_disk(&log->header, log->disk_header); | |
223 | ||
224 | /* New log required? */ | |
225 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { | |
226 | log->header.magic = MIRROR_MAGIC; | |
227 | log->header.version = MIRROR_DISK_VERSION; | |
228 | log->header.nr_regions = 0; | |
229 | } | |
230 | ||
a4fc4717 PC |
231 | #ifdef __LITTLE_ENDIAN |
232 | if (log->header.version == 1) | |
233 | log->header.version = 2; | |
234 | #endif | |
235 | ||
1da177e4 LT |
236 | if (log->header.version != MIRROR_DISK_VERSION) { |
237 | DMWARN("incompatible disk log version"); | |
238 | return -EINVAL; | |
239 | } | |
240 | ||
241 | return 0; | |
242 | } | |
243 | ||
244 | static inline int write_header(struct log_c *log) | |
245 | { | |
1da177e4 | 246 | header_to_disk(&log->header, log->disk_header); |
5d234d1e | 247 | return rw_header(log, WRITE); |
1da177e4 LT |
248 | } |
249 | ||
1da177e4 LT |
250 | /*---------------------------------------------------------------- |
251 | * core log constructor/destructor | |
252 | * | |
253 | * argv contains region_size followed optionally by [no]sync | |
254 | *--------------------------------------------------------------*/ | |
255 | #define BYTE_SHIFT 3 | |
b7cca195 AK |
256 | static int create_log_context(struct dirty_log *log, struct dm_target *ti, |
257 | unsigned int argc, char **argv, | |
258 | struct dm_dev *dev) | |
1da177e4 LT |
259 | { |
260 | enum sync sync = DEFAULTSYNC; | |
261 | ||
262 | struct log_c *lc; | |
263 | uint32_t region_size; | |
264 | unsigned int region_count; | |
b7cca195 | 265 | size_t bitset_size, buf_size; |
5d234d1e | 266 | int r; |
1da177e4 LT |
267 | |
268 | if (argc < 1 || argc > 2) { | |
269 | DMWARN("wrong number of arguments to mirror log"); | |
270 | return -EINVAL; | |
271 | } | |
272 | ||
273 | if (argc > 1) { | |
274 | if (!strcmp(argv[1], "sync")) | |
275 | sync = FORCESYNC; | |
276 | else if (!strcmp(argv[1], "nosync")) | |
277 | sync = NOSYNC; | |
278 | else { | |
279 | DMWARN("unrecognised sync argument to mirror log: %s", | |
280 | argv[1]); | |
281 | return -EINVAL; | |
282 | } | |
283 | } | |
284 | ||
285 | if (sscanf(argv[0], "%u", ®ion_size) != 1) { | |
286 | DMWARN("invalid region size string"); | |
287 | return -EINVAL; | |
288 | } | |
289 | ||
290 | region_count = dm_sector_div_up(ti->len, region_size); | |
291 | ||
292 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
293 | if (!lc) { | |
294 | DMWARN("couldn't allocate core log"); | |
295 | return -ENOMEM; | |
296 | } | |
297 | ||
298 | lc->ti = ti; | |
299 | lc->touched = 0; | |
300 | lc->region_size = region_size; | |
301 | lc->region_count = region_count; | |
302 | lc->sync = sync; | |
303 | ||
304 | /* | |
0e56822d | 305 | * Work out how many "unsigned long"s we need to hold the bitset. |
1da177e4 LT |
306 | */ |
307 | bitset_size = dm_round_up(region_count, | |
29121bd0 | 308 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
1da177e4 LT |
309 | bitset_size >>= BYTE_SHIFT; |
310 | ||
29121bd0 | 311 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
b7cca195 AK |
312 | |
313 | /* | |
314 | * Disk log? | |
315 | */ | |
316 | if (!dev) { | |
317 | lc->clean_bits = vmalloc(bitset_size); | |
318 | if (!lc->clean_bits) { | |
319 | DMWARN("couldn't allocate clean bitset"); | |
320 | kfree(lc); | |
321 | return -ENOMEM; | |
322 | } | |
323 | lc->disk_header = NULL; | |
324 | } else { | |
325 | lc->log_dev = dev; | |
01d03a66 | 326 | lc->log_dev_failed = 0; |
b7cca195 AK |
327 | lc->header_location.bdev = lc->log_dev->bdev; |
328 | lc->header_location.sector = 0; | |
329 | ||
330 | /* | |
331 | * Buffer holds both header and bitset. | |
332 | */ | |
333 | buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + | |
334 | bitset_size, ti->limits.hardsect_size); | |
335 | lc->header_location.count = buf_size >> SECTOR_SHIFT; | |
5d234d1e HM |
336 | lc->io_req.mem.type = DM_IO_VMA; |
337 | lc->io_req.client = dm_io_client_create(dm_div_up(buf_size, | |
338 | PAGE_SIZE)); | |
339 | if (IS_ERR(lc->io_req.client)) { | |
340 | r = PTR_ERR(lc->io_req.client); | |
341 | DMWARN("couldn't allocate disk io client"); | |
342 | kfree(lc); | |
343 | return -ENOMEM; | |
344 | } | |
b7cca195 AK |
345 | |
346 | lc->disk_header = vmalloc(buf_size); | |
347 | if (!lc->disk_header) { | |
348 | DMWARN("couldn't allocate disk log buffer"); | |
349 | kfree(lc); | |
350 | return -ENOMEM; | |
351 | } | |
352 | ||
353 | lc->clean_bits = (void *)lc->disk_header + | |
354 | (LOG_OFFSET << SECTOR_SHIFT); | |
1da177e4 | 355 | } |
b7cca195 | 356 | |
1da177e4 LT |
357 | memset(lc->clean_bits, -1, bitset_size); |
358 | ||
359 | lc->sync_bits = vmalloc(bitset_size); | |
360 | if (!lc->sync_bits) { | |
361 | DMWARN("couldn't allocate sync bitset"); | |
b7cca195 AK |
362 | if (!dev) |
363 | vfree(lc->clean_bits); | |
364 | vfree(lc->disk_header); | |
1da177e4 LT |
365 | kfree(lc); |
366 | return -ENOMEM; | |
367 | } | |
368 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); | |
369 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; | |
370 | ||
371 | lc->recovering_bits = vmalloc(bitset_size); | |
372 | if (!lc->recovering_bits) { | |
373 | DMWARN("couldn't allocate sync bitset"); | |
374 | vfree(lc->sync_bits); | |
b7cca195 AK |
375 | if (!dev) |
376 | vfree(lc->clean_bits); | |
377 | vfree(lc->disk_header); | |
1da177e4 LT |
378 | kfree(lc); |
379 | return -ENOMEM; | |
380 | } | |
381 | memset(lc->recovering_bits, 0, bitset_size); | |
382 | lc->sync_search = 0; | |
383 | log->context = lc; | |
b7cca195 | 384 | |
1da177e4 LT |
385 | return 0; |
386 | } | |
387 | ||
b7cca195 AK |
388 | static int core_ctr(struct dirty_log *log, struct dm_target *ti, |
389 | unsigned int argc, char **argv) | |
390 | { | |
391 | return create_log_context(log, ti, argc, argv, NULL); | |
392 | } | |
393 | ||
394 | static void destroy_log_context(struct log_c *lc) | |
1da177e4 | 395 | { |
1da177e4 LT |
396 | vfree(lc->sync_bits); |
397 | vfree(lc->recovering_bits); | |
398 | kfree(lc); | |
399 | } | |
400 | ||
b7cca195 AK |
401 | static void core_dtr(struct dirty_log *log) |
402 | { | |
403 | struct log_c *lc = (struct log_c *) log->context; | |
404 | ||
405 | vfree(lc->clean_bits); | |
406 | destroy_log_context(lc); | |
407 | } | |
408 | ||
1da177e4 LT |
409 | /*---------------------------------------------------------------- |
410 | * disk log constructor/destructor | |
411 | * | |
412 | * argv contains log_device region_size followed optionally by [no]sync | |
413 | *--------------------------------------------------------------*/ | |
414 | static int disk_ctr(struct dirty_log *log, struct dm_target *ti, | |
415 | unsigned int argc, char **argv) | |
416 | { | |
417 | int r; | |
1da177e4 LT |
418 | struct dm_dev *dev; |
419 | ||
420 | if (argc < 2 || argc > 3) { | |
421 | DMWARN("wrong number of arguments to disk mirror log"); | |
422 | return -EINVAL; | |
423 | } | |
424 | ||
425 | r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */, | |
426 | FMODE_READ | FMODE_WRITE, &dev); | |
427 | if (r) | |
428 | return r; | |
429 | ||
b7cca195 | 430 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
1da177e4 LT |
431 | if (r) { |
432 | dm_put_device(ti, dev); | |
433 | return r; | |
434 | } | |
435 | ||
1da177e4 | 436 | return 0; |
1da177e4 LT |
437 | } |
438 | ||
439 | static void disk_dtr(struct dirty_log *log) | |
440 | { | |
441 | struct log_c *lc = (struct log_c *) log->context; | |
b7cca195 | 442 | |
1da177e4 LT |
443 | dm_put_device(lc->ti, lc->log_dev); |
444 | vfree(lc->disk_header); | |
5d234d1e | 445 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 | 446 | destroy_log_context(lc); |
1da177e4 LT |
447 | } |
448 | ||
449 | static int count_bits32(uint32_t *addr, unsigned size) | |
450 | { | |
451 | int count = 0, i; | |
452 | ||
453 | for (i = 0; i < size; i++) { | |
454 | count += hweight32(*(addr+i)); | |
455 | } | |
456 | return count; | |
457 | } | |
458 | ||
01d03a66 JB |
459 | static void fail_log_device(struct log_c *lc) |
460 | { | |
461 | if (lc->log_dev_failed) | |
462 | return; | |
463 | ||
464 | lc->log_dev_failed = 1; | |
465 | dm_table_event(lc->ti->table); | |
466 | } | |
467 | ||
1da177e4 LT |
468 | static int disk_resume(struct dirty_log *log) |
469 | { | |
470 | int r; | |
471 | unsigned i; | |
472 | struct log_c *lc = (struct log_c *) log->context; | |
473 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); | |
474 | ||
475 | /* read the disk header */ | |
476 | r = read_header(lc); | |
01d03a66 JB |
477 | if (r) { |
478 | DMWARN("%s: Failed to read header on mirror log device", | |
479 | lc->log_dev->name); | |
480 | fail_log_device(lc); | |
ba8b45ce JB |
481 | /* |
482 | * If the log device cannot be read, we must assume | |
483 | * all regions are out-of-sync. If we simply return | |
484 | * here, the state will be uninitialized and could | |
485 | * lead us to return 'in-sync' status for regions | |
486 | * that are actually 'out-of-sync'. | |
487 | */ | |
488 | lc->header.nr_regions = 0; | |
01d03a66 | 489 | } |
1da177e4 | 490 | |
8a835f11 | 491 | /* set or clear any new bits -- device has grown */ |
1da177e4 LT |
492 | if (lc->sync == NOSYNC) |
493 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
494 | /* FIXME: amazingly inefficient */ | |
495 | log_set_bit(lc, lc->clean_bits, i); | |
496 | else | |
497 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
498 | /* FIXME: amazingly inefficient */ | |
499 | log_clear_bit(lc, lc->clean_bits, i); | |
500 | ||
8a835f11 AK |
501 | /* clear any old bits -- device has shrunk */ |
502 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) | |
503 | log_clear_bit(lc, lc->clean_bits, i); | |
504 | ||
1da177e4 LT |
505 | /* copy clean across to sync */ |
506 | memcpy(lc->sync_bits, lc->clean_bits, size); | |
507 | lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); | |
88b20a1a | 508 | lc->sync_search = 0; |
1da177e4 | 509 | |
1da177e4 LT |
510 | /* set the correct number of regions in the header */ |
511 | lc->header.nr_regions = lc->region_count; | |
512 | ||
513 | /* write the new header */ | |
01d03a66 JB |
514 | r = write_header(lc); |
515 | if (r) { | |
516 | DMWARN("%s: Failed to write header on mirror log device", | |
517 | lc->log_dev->name); | |
518 | fail_log_device(lc); | |
519 | } | |
520 | ||
521 | return r; | |
1da177e4 LT |
522 | } |
523 | ||
524 | static uint32_t core_get_region_size(struct dirty_log *log) | |
525 | { | |
526 | struct log_c *lc = (struct log_c *) log->context; | |
527 | return lc->region_size; | |
528 | } | |
529 | ||
88b20a1a JB |
530 | static int core_resume(struct dirty_log *log) |
531 | { | |
532 | struct log_c *lc = (struct log_c *) log->context; | |
533 | lc->sync_search = 0; | |
534 | return 0; | |
535 | } | |
536 | ||
1da177e4 LT |
537 | static int core_is_clean(struct dirty_log *log, region_t region) |
538 | { | |
539 | struct log_c *lc = (struct log_c *) log->context; | |
540 | return log_test_bit(lc->clean_bits, region); | |
541 | } | |
542 | ||
543 | static int core_in_sync(struct dirty_log *log, region_t region, int block) | |
544 | { | |
545 | struct log_c *lc = (struct log_c *) log->context; | |
546 | return log_test_bit(lc->sync_bits, region); | |
547 | } | |
548 | ||
549 | static int core_flush(struct dirty_log *log) | |
550 | { | |
551 | /* no op */ | |
552 | return 0; | |
553 | } | |
554 | ||
555 | static int disk_flush(struct dirty_log *log) | |
556 | { | |
557 | int r; | |
558 | struct log_c *lc = (struct log_c *) log->context; | |
559 | ||
560 | /* only write if the log has changed */ | |
561 | if (!lc->touched) | |
562 | return 0; | |
563 | ||
702ca6f0 | 564 | r = write_header(lc); |
01d03a66 JB |
565 | if (r) |
566 | fail_log_device(lc); | |
567 | else | |
1da177e4 LT |
568 | lc->touched = 0; |
569 | ||
570 | return r; | |
571 | } | |
572 | ||
573 | static void core_mark_region(struct dirty_log *log, region_t region) | |
574 | { | |
575 | struct log_c *lc = (struct log_c *) log->context; | |
576 | log_clear_bit(lc, lc->clean_bits, region); | |
577 | } | |
578 | ||
579 | static void core_clear_region(struct dirty_log *log, region_t region) | |
580 | { | |
581 | struct log_c *lc = (struct log_c *) log->context; | |
582 | log_set_bit(lc, lc->clean_bits, region); | |
583 | } | |
584 | ||
585 | static int core_get_resync_work(struct dirty_log *log, region_t *region) | |
586 | { | |
587 | struct log_c *lc = (struct log_c *) log->context; | |
588 | ||
589 | if (lc->sync_search >= lc->region_count) | |
590 | return 0; | |
591 | ||
592 | do { | |
1113a7e9 SB |
593 | *region = ext2_find_next_zero_bit( |
594 | (unsigned long *) lc->sync_bits, | |
1da177e4 LT |
595 | lc->region_count, |
596 | lc->sync_search); | |
597 | lc->sync_search = *region + 1; | |
598 | ||
ac81b2ee | 599 | if (*region >= lc->region_count) |
1da177e4 LT |
600 | return 0; |
601 | ||
602 | } while (log_test_bit(lc->recovering_bits, *region)); | |
603 | ||
604 | log_set_bit(lc, lc->recovering_bits, *region); | |
605 | return 1; | |
606 | } | |
607 | ||
f3ee6b2f JB |
608 | static void core_set_region_sync(struct dirty_log *log, region_t region, |
609 | int in_sync) | |
1da177e4 LT |
610 | { |
611 | struct log_c *lc = (struct log_c *) log->context; | |
612 | ||
613 | log_clear_bit(lc, lc->recovering_bits, region); | |
f3ee6b2f | 614 | if (in_sync) { |
1da177e4 LT |
615 | log_set_bit(lc, lc->sync_bits, region); |
616 | lc->sync_count++; | |
f3ee6b2f JB |
617 | } else if (log_test_bit(lc->sync_bits, region)) { |
618 | lc->sync_count--; | |
619 | log_clear_bit(lc, lc->sync_bits, region); | |
620 | } | |
1da177e4 LT |
621 | } |
622 | ||
623 | static region_t core_get_sync_count(struct dirty_log *log) | |
624 | { | |
625 | struct log_c *lc = (struct log_c *) log->context; | |
626 | ||
627 | return lc->sync_count; | |
628 | } | |
629 | ||
630 | #define DMEMIT_SYNC \ | |
631 | if (lc->sync != DEFAULTSYNC) \ | |
632 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") | |
633 | ||
634 | static int core_status(struct dirty_log *log, status_type_t status, | |
635 | char *result, unsigned int maxlen) | |
636 | { | |
637 | int sz = 0; | |
638 | struct log_c *lc = log->context; | |
639 | ||
640 | switch(status) { | |
641 | case STATUSTYPE_INFO: | |
315dcc22 | 642 | DMEMIT("1 %s", log->type->name); |
1da177e4 LT |
643 | break; |
644 | ||
645 | case STATUSTYPE_TABLE: | |
646 | DMEMIT("%s %u %u ", log->type->name, | |
647 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); | |
648 | DMEMIT_SYNC; | |
649 | } | |
650 | ||
651 | return sz; | |
652 | } | |
653 | ||
654 | static int disk_status(struct dirty_log *log, status_type_t status, | |
655 | char *result, unsigned int maxlen) | |
656 | { | |
657 | int sz = 0; | |
1da177e4 LT |
658 | struct log_c *lc = log->context; |
659 | ||
660 | switch(status) { | |
661 | case STATUSTYPE_INFO: | |
315dcc22 JB |
662 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
663 | lc->log_dev_failed ? 'D' : 'A'); | |
1da177e4 LT |
664 | break; |
665 | ||
666 | case STATUSTYPE_TABLE: | |
1da177e4 | 667 | DMEMIT("%s %u %s %u ", log->type->name, |
315dcc22 | 668 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
1da177e4 LT |
669 | lc->region_size); |
670 | DMEMIT_SYNC; | |
671 | } | |
672 | ||
673 | return sz; | |
674 | } | |
675 | ||
676 | static struct dirty_log_type _core_type = { | |
677 | .name = "core", | |
678 | .module = THIS_MODULE, | |
679 | .ctr = core_ctr, | |
680 | .dtr = core_dtr, | |
88b20a1a | 681 | .resume = core_resume, |
1da177e4 LT |
682 | .get_region_size = core_get_region_size, |
683 | .is_clean = core_is_clean, | |
684 | .in_sync = core_in_sync, | |
685 | .flush = core_flush, | |
686 | .mark_region = core_mark_region, | |
687 | .clear_region = core_clear_region, | |
688 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 689 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
690 | .get_sync_count = core_get_sync_count, |
691 | .status = core_status, | |
692 | }; | |
693 | ||
694 | static struct dirty_log_type _disk_type = { | |
695 | .name = "disk", | |
696 | .module = THIS_MODULE, | |
697 | .ctr = disk_ctr, | |
698 | .dtr = disk_dtr, | |
699 | .suspend = disk_flush, | |
700 | .resume = disk_resume, | |
701 | .get_region_size = core_get_region_size, | |
702 | .is_clean = core_is_clean, | |
703 | .in_sync = core_in_sync, | |
704 | .flush = disk_flush, | |
705 | .mark_region = core_mark_region, | |
706 | .clear_region = core_clear_region, | |
707 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 708 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
709 | .get_sync_count = core_get_sync_count, |
710 | .status = disk_status, | |
711 | }; | |
712 | ||
713 | int __init dm_dirty_log_init(void) | |
714 | { | |
715 | int r; | |
716 | ||
717 | r = dm_register_dirty_log_type(&_core_type); | |
718 | if (r) | |
719 | DMWARN("couldn't register core log"); | |
720 | ||
721 | r = dm_register_dirty_log_type(&_disk_type); | |
722 | if (r) { | |
723 | DMWARN("couldn't register disk type"); | |
724 | dm_unregister_dirty_log_type(&_core_type); | |
725 | } | |
726 | ||
727 | return r; | |
728 | } | |
729 | ||
730 | void dm_dirty_log_exit(void) | |
731 | { | |
732 | dm_unregister_dirty_log_type(&_disk_type); | |
733 | dm_unregister_dirty_log_type(&_core_type); | |
734 | } | |
735 | ||
736 | EXPORT_SYMBOL(dm_register_dirty_log_type); | |
737 | EXPORT_SYMBOL(dm_unregister_dirty_log_type); | |
738 | EXPORT_SYMBOL(dm_create_dirty_log); | |
739 | EXPORT_SYMBOL(dm_destroy_dirty_log); |