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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright (C) 2003 Sistina Software | |
b7fd54a7 | 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
1da177e4 LT |
4 | * |
5 | * This file is released under the LGPL. | |
6 | */ | |
7 | ||
8 | #include <linux/init.h> | |
9 | #include <linux/slab.h> | |
10 | #include <linux/module.h> | |
11 | #include <linux/vmalloc.h> | |
12 | ||
13 | #include "dm-log.h" | |
14 | #include "dm-io.h" | |
416cd17b | 15 | #include "dm.h" |
1da177e4 | 16 | |
b7fd54a7 | 17 | #define DM_MSG_PREFIX "dirty region log" |
72d94861 | 18 | |
1da177e4 LT |
19 | static LIST_HEAD(_log_types); |
20 | static DEFINE_SPINLOCK(_lock); | |
21 | ||
416cd17b | 22 | static struct dm_dirty_log_type *_get_type(const char *type_name) |
1da177e4 | 23 | { |
416cd17b | 24 | struct dm_dirty_log_type *type; |
1da177e4 LT |
25 | |
26 | spin_lock(&_lock); | |
27 | list_for_each_entry (type, &_log_types, list) | |
28 | if (!strcmp(type_name, type->name)) { | |
29 | if (!type->use_count && !try_module_get(type->module)){ | |
30 | spin_unlock(&_lock); | |
31 | return NULL; | |
32 | } | |
33 | type->use_count++; | |
34 | spin_unlock(&_lock); | |
35 | return type; | |
36 | } | |
37 | ||
38 | spin_unlock(&_lock); | |
39 | return NULL; | |
40 | } | |
41 | ||
fb8b2848 JB |
42 | /* |
43 | * get_type | |
44 | * @type_name | |
45 | * | |
46 | * Attempt to retrieve the dirty_log_type by name. If not already | |
47 | * available, attempt to load the appropriate module. | |
48 | * | |
49 | * Log modules are named "dm-log-" followed by the 'type_name'. | |
50 | * Modules may contain multiple types. | |
51 | * This function will first try the module "dm-log-<type_name>", | |
52 | * then truncate 'type_name' on the last '-' and try again. | |
53 | * | |
54 | * For example, if type_name was "clustered-disk", it would search | |
55 | * 'dm-log-clustered-disk' then 'dm-log-clustered'. | |
56 | * | |
57 | * Returns: dirty_log_type* on success, NULL on failure | |
58 | */ | |
416cd17b | 59 | static struct dm_dirty_log_type *get_type(const char *type_name) |
fb8b2848 JB |
60 | { |
61 | char *p, *type_name_dup; | |
416cd17b | 62 | struct dm_dirty_log_type *type; |
fb8b2848 JB |
63 | |
64 | type = _get_type(type_name); | |
65 | if (type) | |
66 | return type; | |
67 | ||
68 | type_name_dup = kstrdup(type_name, GFP_KERNEL); | |
69 | if (!type_name_dup) { | |
70 | DMWARN("No memory left to attempt log module load for \"%s\"", | |
71 | type_name); | |
72 | return NULL; | |
73 | } | |
74 | ||
75 | while (request_module("dm-log-%s", type_name_dup) || | |
76 | !(type = _get_type(type_name))) { | |
77 | p = strrchr(type_name_dup, '-'); | |
78 | if (!p) | |
79 | break; | |
80 | p[0] = '\0'; | |
81 | } | |
82 | ||
83 | if (!type) | |
84 | DMWARN("Module for logging type \"%s\" not found.", type_name); | |
85 | ||
86 | kfree(type_name_dup); | |
87 | ||
88 | return type; | |
89 | } | |
90 | ||
416cd17b | 91 | static void put_type(struct dm_dirty_log_type *type) |
1da177e4 LT |
92 | { |
93 | spin_lock(&_lock); | |
94 | if (!--type->use_count) | |
95 | module_put(type->module); | |
96 | spin_unlock(&_lock); | |
97 | } | |
98 | ||
b8206bc3 AK |
99 | int dm_dirty_log_type_register(struct dm_dirty_log_type *type) |
100 | { | |
101 | spin_lock(&_lock); | |
102 | type->use_count = 0; | |
103 | list_add(&type->list, &_log_types); | |
104 | spin_unlock(&_lock); | |
105 | ||
106 | return 0; | |
107 | } | |
108 | EXPORT_SYMBOL(dm_dirty_log_type_register); | |
109 | ||
110 | int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type) | |
111 | { | |
112 | spin_lock(&_lock); | |
113 | ||
114 | if (type->use_count) | |
115 | DMWARN("Attempt to unregister a log type that is still in use"); | |
116 | else | |
117 | list_del(&type->list); | |
118 | ||
119 | spin_unlock(&_lock); | |
120 | ||
121 | return 0; | |
122 | } | |
123 | EXPORT_SYMBOL(dm_dirty_log_type_unregister); | |
124 | ||
416cd17b HM |
125 | struct dm_dirty_log *dm_dirty_log_create(const char *type_name, |
126 | struct dm_target *ti, | |
127 | unsigned int argc, char **argv) | |
1da177e4 | 128 | { |
416cd17b HM |
129 | struct dm_dirty_log_type *type; |
130 | struct dm_dirty_log *log; | |
1da177e4 LT |
131 | |
132 | log = kmalloc(sizeof(*log), GFP_KERNEL); | |
133 | if (!log) | |
134 | return NULL; | |
135 | ||
136 | type = get_type(type_name); | |
137 | if (!type) { | |
138 | kfree(log); | |
139 | return NULL; | |
140 | } | |
141 | ||
142 | log->type = type; | |
143 | if (type->ctr(log, ti, argc, argv)) { | |
144 | kfree(log); | |
145 | put_type(type); | |
146 | return NULL; | |
147 | } | |
148 | ||
149 | return log; | |
150 | } | |
416cd17b | 151 | EXPORT_SYMBOL(dm_dirty_log_create); |
1da177e4 | 152 | |
416cd17b | 153 | void dm_dirty_log_destroy(struct dm_dirty_log *log) |
1da177e4 LT |
154 | { |
155 | log->type->dtr(log); | |
156 | put_type(log->type); | |
157 | kfree(log); | |
158 | } | |
416cd17b | 159 | EXPORT_SYMBOL(dm_dirty_log_destroy); |
1da177e4 LT |
160 | |
161 | /*----------------------------------------------------------------- | |
162 | * Persistent and core logs share a lot of their implementation. | |
163 | * FIXME: need a reload method to be called from a resume | |
164 | *---------------------------------------------------------------*/ | |
165 | /* | |
166 | * Magic for persistent mirrors: "MiRr" | |
167 | */ | |
168 | #define MIRROR_MAGIC 0x4D695272 | |
169 | ||
170 | /* | |
171 | * The on-disk version of the metadata. | |
172 | */ | |
a4fc4717 | 173 | #define MIRROR_DISK_VERSION 2 |
1da177e4 LT |
174 | #define LOG_OFFSET 2 |
175 | ||
176 | struct log_header { | |
177 | uint32_t magic; | |
178 | ||
179 | /* | |
180 | * Simple, incrementing version. no backward | |
181 | * compatibility. | |
182 | */ | |
183 | uint32_t version; | |
184 | sector_t nr_regions; | |
185 | }; | |
186 | ||
187 | struct log_c { | |
188 | struct dm_target *ti; | |
189 | int touched; | |
190 | uint32_t region_size; | |
191 | unsigned int region_count; | |
192 | region_t sync_count; | |
193 | ||
194 | unsigned bitset_uint32_count; | |
195 | uint32_t *clean_bits; | |
196 | uint32_t *sync_bits; | |
197 | uint32_t *recovering_bits; /* FIXME: this seems excessive */ | |
198 | ||
199 | int sync_search; | |
200 | ||
201 | /* Resync flag */ | |
202 | enum sync { | |
203 | DEFAULTSYNC, /* Synchronize if necessary */ | |
204 | NOSYNC, /* Devices known to be already in sync */ | |
205 | FORCESYNC, /* Force a sync to happen */ | |
206 | } sync; | |
207 | ||
5d234d1e HM |
208 | struct dm_io_request io_req; |
209 | ||
1da177e4 LT |
210 | /* |
211 | * Disk log fields | |
212 | */ | |
01d03a66 | 213 | int log_dev_failed; |
1da177e4 LT |
214 | struct dm_dev *log_dev; |
215 | struct log_header header; | |
216 | ||
22a1ceb1 | 217 | struct dm_io_region header_location; |
1da177e4 | 218 | struct log_header *disk_header; |
1da177e4 LT |
219 | }; |
220 | ||
221 | /* | |
222 | * The touched member needs to be updated every time we access | |
223 | * one of the bitsets. | |
224 | */ | |
416cd17b | 225 | static inline int log_test_bit(uint32_t *bs, unsigned bit) |
1da177e4 | 226 | { |
a4fc4717 | 227 | return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; |
1da177e4 LT |
228 | } |
229 | ||
230 | static inline void log_set_bit(struct log_c *l, | |
231 | uint32_t *bs, unsigned bit) | |
232 | { | |
a4fc4717 | 233 | ext2_set_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
234 | l->touched = 1; |
235 | } | |
236 | ||
237 | static inline void log_clear_bit(struct log_c *l, | |
238 | uint32_t *bs, unsigned bit) | |
239 | { | |
a4fc4717 | 240 | ext2_clear_bit(bit, (unsigned long *) bs); |
1da177e4 LT |
241 | l->touched = 1; |
242 | } | |
243 | ||
244 | /*---------------------------------------------------------------- | |
245 | * Header IO | |
246 | *--------------------------------------------------------------*/ | |
247 | static void header_to_disk(struct log_header *core, struct log_header *disk) | |
248 | { | |
249 | disk->magic = cpu_to_le32(core->magic); | |
250 | disk->version = cpu_to_le32(core->version); | |
251 | disk->nr_regions = cpu_to_le64(core->nr_regions); | |
252 | } | |
253 | ||
254 | static void header_from_disk(struct log_header *core, struct log_header *disk) | |
255 | { | |
256 | core->magic = le32_to_cpu(disk->magic); | |
257 | core->version = le32_to_cpu(disk->version); | |
258 | core->nr_regions = le64_to_cpu(disk->nr_regions); | |
259 | } | |
260 | ||
5d234d1e HM |
261 | static int rw_header(struct log_c *lc, int rw) |
262 | { | |
263 | lc->io_req.bi_rw = rw; | |
264 | lc->io_req.mem.ptr.vma = lc->disk_header; | |
265 | lc->io_req.notify.fn = NULL; | |
266 | ||
267 | return dm_io(&lc->io_req, 1, &lc->header_location, NULL); | |
268 | } | |
269 | ||
1da177e4 LT |
270 | static int read_header(struct log_c *log) |
271 | { | |
272 | int r; | |
1da177e4 | 273 | |
5d234d1e | 274 | r = rw_header(log, READ); |
1da177e4 LT |
275 | if (r) |
276 | return r; | |
277 | ||
278 | header_from_disk(&log->header, log->disk_header); | |
279 | ||
280 | /* New log required? */ | |
281 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { | |
282 | log->header.magic = MIRROR_MAGIC; | |
283 | log->header.version = MIRROR_DISK_VERSION; | |
284 | log->header.nr_regions = 0; | |
285 | } | |
286 | ||
a4fc4717 PC |
287 | #ifdef __LITTLE_ENDIAN |
288 | if (log->header.version == 1) | |
289 | log->header.version = 2; | |
290 | #endif | |
291 | ||
1da177e4 LT |
292 | if (log->header.version != MIRROR_DISK_VERSION) { |
293 | DMWARN("incompatible disk log version"); | |
294 | return -EINVAL; | |
295 | } | |
296 | ||
297 | return 0; | |
298 | } | |
299 | ||
300 | static inline int write_header(struct log_c *log) | |
301 | { | |
1da177e4 | 302 | header_to_disk(&log->header, log->disk_header); |
5d234d1e | 303 | return rw_header(log, WRITE); |
1da177e4 LT |
304 | } |
305 | ||
1da177e4 LT |
306 | /*---------------------------------------------------------------- |
307 | * core log constructor/destructor | |
308 | * | |
309 | * argv contains region_size followed optionally by [no]sync | |
310 | *--------------------------------------------------------------*/ | |
311 | #define BYTE_SHIFT 3 | |
416cd17b | 312 | static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
313 | unsigned int argc, char **argv, |
314 | struct dm_dev *dev) | |
1da177e4 LT |
315 | { |
316 | enum sync sync = DEFAULTSYNC; | |
317 | ||
318 | struct log_c *lc; | |
319 | uint32_t region_size; | |
320 | unsigned int region_count; | |
b7cca195 | 321 | size_t bitset_size, buf_size; |
5d234d1e | 322 | int r; |
1da177e4 LT |
323 | |
324 | if (argc < 1 || argc > 2) { | |
b7fd54a7 | 325 | DMWARN("wrong number of arguments to dirty region log"); |
1da177e4 LT |
326 | return -EINVAL; |
327 | } | |
328 | ||
329 | if (argc > 1) { | |
330 | if (!strcmp(argv[1], "sync")) | |
331 | sync = FORCESYNC; | |
332 | else if (!strcmp(argv[1], "nosync")) | |
333 | sync = NOSYNC; | |
334 | else { | |
b7fd54a7 HM |
335 | DMWARN("unrecognised sync argument to " |
336 | "dirty region log: %s", argv[1]); | |
1da177e4 LT |
337 | return -EINVAL; |
338 | } | |
339 | } | |
340 | ||
341 | if (sscanf(argv[0], "%u", ®ion_size) != 1) { | |
342 | DMWARN("invalid region size string"); | |
343 | return -EINVAL; | |
344 | } | |
345 | ||
346 | region_count = dm_sector_div_up(ti->len, region_size); | |
347 | ||
348 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
349 | if (!lc) { | |
350 | DMWARN("couldn't allocate core log"); | |
351 | return -ENOMEM; | |
352 | } | |
353 | ||
354 | lc->ti = ti; | |
355 | lc->touched = 0; | |
356 | lc->region_size = region_size; | |
357 | lc->region_count = region_count; | |
358 | lc->sync = sync; | |
359 | ||
360 | /* | |
0e56822d | 361 | * Work out how many "unsigned long"s we need to hold the bitset. |
1da177e4 LT |
362 | */ |
363 | bitset_size = dm_round_up(region_count, | |
29121bd0 | 364 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
1da177e4 LT |
365 | bitset_size >>= BYTE_SHIFT; |
366 | ||
29121bd0 | 367 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
b7cca195 AK |
368 | |
369 | /* | |
370 | * Disk log? | |
371 | */ | |
372 | if (!dev) { | |
373 | lc->clean_bits = vmalloc(bitset_size); | |
374 | if (!lc->clean_bits) { | |
375 | DMWARN("couldn't allocate clean bitset"); | |
376 | kfree(lc); | |
377 | return -ENOMEM; | |
378 | } | |
379 | lc->disk_header = NULL; | |
380 | } else { | |
381 | lc->log_dev = dev; | |
01d03a66 | 382 | lc->log_dev_failed = 0; |
b7cca195 AK |
383 | lc->header_location.bdev = lc->log_dev->bdev; |
384 | lc->header_location.sector = 0; | |
385 | ||
386 | /* | |
387 | * Buffer holds both header and bitset. | |
388 | */ | |
389 | buf_size = dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + | |
390 | bitset_size, ti->limits.hardsect_size); | |
391 | lc->header_location.count = buf_size >> SECTOR_SHIFT; | |
5d234d1e HM |
392 | lc->io_req.mem.type = DM_IO_VMA; |
393 | lc->io_req.client = dm_io_client_create(dm_div_up(buf_size, | |
394 | PAGE_SIZE)); | |
395 | if (IS_ERR(lc->io_req.client)) { | |
396 | r = PTR_ERR(lc->io_req.client); | |
397 | DMWARN("couldn't allocate disk io client"); | |
398 | kfree(lc); | |
399 | return -ENOMEM; | |
400 | } | |
b7cca195 AK |
401 | |
402 | lc->disk_header = vmalloc(buf_size); | |
403 | if (!lc->disk_header) { | |
404 | DMWARN("couldn't allocate disk log buffer"); | |
405 | kfree(lc); | |
406 | return -ENOMEM; | |
407 | } | |
408 | ||
409 | lc->clean_bits = (void *)lc->disk_header + | |
410 | (LOG_OFFSET << SECTOR_SHIFT); | |
1da177e4 | 411 | } |
b7cca195 | 412 | |
1da177e4 LT |
413 | memset(lc->clean_bits, -1, bitset_size); |
414 | ||
415 | lc->sync_bits = vmalloc(bitset_size); | |
416 | if (!lc->sync_bits) { | |
417 | DMWARN("couldn't allocate sync bitset"); | |
b7cca195 AK |
418 | if (!dev) |
419 | vfree(lc->clean_bits); | |
420 | vfree(lc->disk_header); | |
1da177e4 LT |
421 | kfree(lc); |
422 | return -ENOMEM; | |
423 | } | |
424 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); | |
425 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; | |
426 | ||
427 | lc->recovering_bits = vmalloc(bitset_size); | |
428 | if (!lc->recovering_bits) { | |
429 | DMWARN("couldn't allocate sync bitset"); | |
430 | vfree(lc->sync_bits); | |
b7cca195 AK |
431 | if (!dev) |
432 | vfree(lc->clean_bits); | |
433 | vfree(lc->disk_header); | |
1da177e4 LT |
434 | kfree(lc); |
435 | return -ENOMEM; | |
436 | } | |
437 | memset(lc->recovering_bits, 0, bitset_size); | |
438 | lc->sync_search = 0; | |
439 | log->context = lc; | |
b7cca195 | 440 | |
1da177e4 LT |
441 | return 0; |
442 | } | |
443 | ||
416cd17b | 444 | static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
445 | unsigned int argc, char **argv) |
446 | { | |
447 | return create_log_context(log, ti, argc, argv, NULL); | |
448 | } | |
449 | ||
450 | static void destroy_log_context(struct log_c *lc) | |
1da177e4 | 451 | { |
1da177e4 LT |
452 | vfree(lc->sync_bits); |
453 | vfree(lc->recovering_bits); | |
454 | kfree(lc); | |
455 | } | |
456 | ||
416cd17b | 457 | static void core_dtr(struct dm_dirty_log *log) |
b7cca195 AK |
458 | { |
459 | struct log_c *lc = (struct log_c *) log->context; | |
460 | ||
461 | vfree(lc->clean_bits); | |
462 | destroy_log_context(lc); | |
463 | } | |
464 | ||
1da177e4 LT |
465 | /*---------------------------------------------------------------- |
466 | * disk log constructor/destructor | |
467 | * | |
468 | * argv contains log_device region_size followed optionally by [no]sync | |
469 | *--------------------------------------------------------------*/ | |
416cd17b | 470 | static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
1da177e4 LT |
471 | unsigned int argc, char **argv) |
472 | { | |
473 | int r; | |
1da177e4 LT |
474 | struct dm_dev *dev; |
475 | ||
476 | if (argc < 2 || argc > 3) { | |
b7fd54a7 | 477 | DMWARN("wrong number of arguments to disk dirty region log"); |
1da177e4 LT |
478 | return -EINVAL; |
479 | } | |
480 | ||
481 | r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */, | |
482 | FMODE_READ | FMODE_WRITE, &dev); | |
483 | if (r) | |
484 | return r; | |
485 | ||
b7cca195 | 486 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
1da177e4 LT |
487 | if (r) { |
488 | dm_put_device(ti, dev); | |
489 | return r; | |
490 | } | |
491 | ||
1da177e4 | 492 | return 0; |
1da177e4 LT |
493 | } |
494 | ||
416cd17b | 495 | static void disk_dtr(struct dm_dirty_log *log) |
1da177e4 LT |
496 | { |
497 | struct log_c *lc = (struct log_c *) log->context; | |
b7cca195 | 498 | |
1da177e4 LT |
499 | dm_put_device(lc->ti, lc->log_dev); |
500 | vfree(lc->disk_header); | |
5d234d1e | 501 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 | 502 | destroy_log_context(lc); |
1da177e4 LT |
503 | } |
504 | ||
505 | static int count_bits32(uint32_t *addr, unsigned size) | |
506 | { | |
507 | int count = 0, i; | |
508 | ||
509 | for (i = 0; i < size; i++) { | |
510 | count += hweight32(*(addr+i)); | |
511 | } | |
512 | return count; | |
513 | } | |
514 | ||
01d03a66 JB |
515 | static void fail_log_device(struct log_c *lc) |
516 | { | |
517 | if (lc->log_dev_failed) | |
518 | return; | |
519 | ||
520 | lc->log_dev_failed = 1; | |
521 | dm_table_event(lc->ti->table); | |
522 | } | |
523 | ||
416cd17b | 524 | static int disk_resume(struct dm_dirty_log *log) |
1da177e4 LT |
525 | { |
526 | int r; | |
527 | unsigned i; | |
528 | struct log_c *lc = (struct log_c *) log->context; | |
529 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); | |
530 | ||
531 | /* read the disk header */ | |
532 | r = read_header(lc); | |
01d03a66 | 533 | if (r) { |
b7fd54a7 | 534 | DMWARN("%s: Failed to read header on dirty region log device", |
01d03a66 JB |
535 | lc->log_dev->name); |
536 | fail_log_device(lc); | |
ba8b45ce JB |
537 | /* |
538 | * If the log device cannot be read, we must assume | |
539 | * all regions are out-of-sync. If we simply return | |
540 | * here, the state will be uninitialized and could | |
541 | * lead us to return 'in-sync' status for regions | |
542 | * that are actually 'out-of-sync'. | |
543 | */ | |
544 | lc->header.nr_regions = 0; | |
01d03a66 | 545 | } |
1da177e4 | 546 | |
8a835f11 | 547 | /* set or clear any new bits -- device has grown */ |
1da177e4 LT |
548 | if (lc->sync == NOSYNC) |
549 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
550 | /* FIXME: amazingly inefficient */ | |
551 | log_set_bit(lc, lc->clean_bits, i); | |
552 | else | |
553 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
554 | /* FIXME: amazingly inefficient */ | |
555 | log_clear_bit(lc, lc->clean_bits, i); | |
556 | ||
8a835f11 AK |
557 | /* clear any old bits -- device has shrunk */ |
558 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) | |
559 | log_clear_bit(lc, lc->clean_bits, i); | |
560 | ||
1da177e4 LT |
561 | /* copy clean across to sync */ |
562 | memcpy(lc->sync_bits, lc->clean_bits, size); | |
563 | lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); | |
88b20a1a | 564 | lc->sync_search = 0; |
1da177e4 | 565 | |
1da177e4 LT |
566 | /* set the correct number of regions in the header */ |
567 | lc->header.nr_regions = lc->region_count; | |
568 | ||
569 | /* write the new header */ | |
01d03a66 JB |
570 | r = write_header(lc); |
571 | if (r) { | |
b7fd54a7 | 572 | DMWARN("%s: Failed to write header on dirty region log device", |
01d03a66 JB |
573 | lc->log_dev->name); |
574 | fail_log_device(lc); | |
575 | } | |
576 | ||
577 | return r; | |
1da177e4 LT |
578 | } |
579 | ||
416cd17b | 580 | static uint32_t core_get_region_size(struct dm_dirty_log *log) |
1da177e4 LT |
581 | { |
582 | struct log_c *lc = (struct log_c *) log->context; | |
583 | return lc->region_size; | |
584 | } | |
585 | ||
416cd17b | 586 | static int core_resume(struct dm_dirty_log *log) |
88b20a1a JB |
587 | { |
588 | struct log_c *lc = (struct log_c *) log->context; | |
589 | lc->sync_search = 0; | |
590 | return 0; | |
591 | } | |
592 | ||
416cd17b | 593 | static int core_is_clean(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
594 | { |
595 | struct log_c *lc = (struct log_c *) log->context; | |
596 | return log_test_bit(lc->clean_bits, region); | |
597 | } | |
598 | ||
416cd17b | 599 | static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) |
1da177e4 LT |
600 | { |
601 | struct log_c *lc = (struct log_c *) log->context; | |
602 | return log_test_bit(lc->sync_bits, region); | |
603 | } | |
604 | ||
416cd17b | 605 | static int core_flush(struct dm_dirty_log *log) |
1da177e4 LT |
606 | { |
607 | /* no op */ | |
608 | return 0; | |
609 | } | |
610 | ||
416cd17b | 611 | static int disk_flush(struct dm_dirty_log *log) |
1da177e4 LT |
612 | { |
613 | int r; | |
614 | struct log_c *lc = (struct log_c *) log->context; | |
615 | ||
616 | /* only write if the log has changed */ | |
617 | if (!lc->touched) | |
618 | return 0; | |
619 | ||
702ca6f0 | 620 | r = write_header(lc); |
01d03a66 JB |
621 | if (r) |
622 | fail_log_device(lc); | |
623 | else | |
1da177e4 LT |
624 | lc->touched = 0; |
625 | ||
626 | return r; | |
627 | } | |
628 | ||
416cd17b | 629 | static void core_mark_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
630 | { |
631 | struct log_c *lc = (struct log_c *) log->context; | |
632 | log_clear_bit(lc, lc->clean_bits, region); | |
633 | } | |
634 | ||
416cd17b | 635 | static void core_clear_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
636 | { |
637 | struct log_c *lc = (struct log_c *) log->context; | |
638 | log_set_bit(lc, lc->clean_bits, region); | |
639 | } | |
640 | ||
416cd17b | 641 | static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) |
1da177e4 LT |
642 | { |
643 | struct log_c *lc = (struct log_c *) log->context; | |
644 | ||
645 | if (lc->sync_search >= lc->region_count) | |
646 | return 0; | |
647 | ||
648 | do { | |
1113a7e9 SB |
649 | *region = ext2_find_next_zero_bit( |
650 | (unsigned long *) lc->sync_bits, | |
1da177e4 LT |
651 | lc->region_count, |
652 | lc->sync_search); | |
653 | lc->sync_search = *region + 1; | |
654 | ||
ac81b2ee | 655 | if (*region >= lc->region_count) |
1da177e4 LT |
656 | return 0; |
657 | ||
658 | } while (log_test_bit(lc->recovering_bits, *region)); | |
659 | ||
660 | log_set_bit(lc, lc->recovering_bits, *region); | |
661 | return 1; | |
662 | } | |
663 | ||
416cd17b | 664 | static void core_set_region_sync(struct dm_dirty_log *log, region_t region, |
f3ee6b2f | 665 | int in_sync) |
1da177e4 LT |
666 | { |
667 | struct log_c *lc = (struct log_c *) log->context; | |
668 | ||
669 | log_clear_bit(lc, lc->recovering_bits, region); | |
f3ee6b2f | 670 | if (in_sync) { |
1da177e4 LT |
671 | log_set_bit(lc, lc->sync_bits, region); |
672 | lc->sync_count++; | |
f3ee6b2f JB |
673 | } else if (log_test_bit(lc->sync_bits, region)) { |
674 | lc->sync_count--; | |
675 | log_clear_bit(lc, lc->sync_bits, region); | |
676 | } | |
1da177e4 LT |
677 | } |
678 | ||
416cd17b | 679 | static region_t core_get_sync_count(struct dm_dirty_log *log) |
1da177e4 LT |
680 | { |
681 | struct log_c *lc = (struct log_c *) log->context; | |
682 | ||
683 | return lc->sync_count; | |
684 | } | |
685 | ||
686 | #define DMEMIT_SYNC \ | |
687 | if (lc->sync != DEFAULTSYNC) \ | |
688 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") | |
689 | ||
416cd17b | 690 | static int core_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
691 | char *result, unsigned int maxlen) |
692 | { | |
693 | int sz = 0; | |
694 | struct log_c *lc = log->context; | |
695 | ||
696 | switch(status) { | |
697 | case STATUSTYPE_INFO: | |
315dcc22 | 698 | DMEMIT("1 %s", log->type->name); |
1da177e4 LT |
699 | break; |
700 | ||
701 | case STATUSTYPE_TABLE: | |
702 | DMEMIT("%s %u %u ", log->type->name, | |
703 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); | |
704 | DMEMIT_SYNC; | |
705 | } | |
706 | ||
707 | return sz; | |
708 | } | |
709 | ||
416cd17b | 710 | static int disk_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
711 | char *result, unsigned int maxlen) |
712 | { | |
713 | int sz = 0; | |
1da177e4 LT |
714 | struct log_c *lc = log->context; |
715 | ||
716 | switch(status) { | |
717 | case STATUSTYPE_INFO: | |
315dcc22 JB |
718 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
719 | lc->log_dev_failed ? 'D' : 'A'); | |
1da177e4 LT |
720 | break; |
721 | ||
722 | case STATUSTYPE_TABLE: | |
1da177e4 | 723 | DMEMIT("%s %u %s %u ", log->type->name, |
315dcc22 | 724 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
1da177e4 LT |
725 | lc->region_size); |
726 | DMEMIT_SYNC; | |
727 | } | |
728 | ||
729 | return sz; | |
730 | } | |
731 | ||
416cd17b | 732 | static struct dm_dirty_log_type _core_type = { |
1da177e4 LT |
733 | .name = "core", |
734 | .module = THIS_MODULE, | |
735 | .ctr = core_ctr, | |
736 | .dtr = core_dtr, | |
88b20a1a | 737 | .resume = core_resume, |
1da177e4 LT |
738 | .get_region_size = core_get_region_size, |
739 | .is_clean = core_is_clean, | |
740 | .in_sync = core_in_sync, | |
741 | .flush = core_flush, | |
742 | .mark_region = core_mark_region, | |
743 | .clear_region = core_clear_region, | |
744 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 745 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
746 | .get_sync_count = core_get_sync_count, |
747 | .status = core_status, | |
748 | }; | |
749 | ||
416cd17b | 750 | static struct dm_dirty_log_type _disk_type = { |
1da177e4 LT |
751 | .name = "disk", |
752 | .module = THIS_MODULE, | |
753 | .ctr = disk_ctr, | |
754 | .dtr = disk_dtr, | |
6b3df0d7 | 755 | .postsuspend = disk_flush, |
1da177e4 LT |
756 | .resume = disk_resume, |
757 | .get_region_size = core_get_region_size, | |
758 | .is_clean = core_is_clean, | |
759 | .in_sync = core_in_sync, | |
760 | .flush = disk_flush, | |
761 | .mark_region = core_mark_region, | |
762 | .clear_region = core_clear_region, | |
763 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 764 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
765 | .get_sync_count = core_get_sync_count, |
766 | .status = disk_status, | |
767 | }; | |
768 | ||
769 | int __init dm_dirty_log_init(void) | |
770 | { | |
771 | int r; | |
772 | ||
416cd17b | 773 | r = dm_dirty_log_type_register(&_core_type); |
1da177e4 LT |
774 | if (r) |
775 | DMWARN("couldn't register core log"); | |
776 | ||
416cd17b | 777 | r = dm_dirty_log_type_register(&_disk_type); |
1da177e4 LT |
778 | if (r) { |
779 | DMWARN("couldn't register disk type"); | |
416cd17b | 780 | dm_dirty_log_type_unregister(&_core_type); |
1da177e4 LT |
781 | } |
782 | ||
783 | return r; | |
784 | } | |
785 | ||
769aef30 | 786 | void __exit dm_dirty_log_exit(void) |
1da177e4 | 787 | { |
416cd17b HM |
788 | dm_dirty_log_type_unregister(&_disk_type); |
789 | dm_dirty_log_type_unregister(&_core_type); | |
1da177e4 LT |
790 | } |
791 | ||
769aef30 HM |
792 | module_init(dm_dirty_log_init); |
793 | module_exit(dm_dirty_log_exit); | |
794 | ||
795 | MODULE_DESCRIPTION(DM_NAME " dirty region log"); | |
796 | MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); | |
797 | MODULE_LICENSE("GPL"); |