]>
Commit | Line | Data |
---|---|---|
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> | |
a765e20e AK |
12 | #include <linux/dm-io.h> |
13 | #include <linux/dm-dirty-log.h> | |
1da177e4 | 14 | |
586e80e6 | 15 | #include <linux/device-mapper.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 | ||
ec44ab9d | 22 | static struct dm_dirty_log_type *__find_dirty_log_type(const char *name) |
1da177e4 | 23 | { |
ec44ab9d | 24 | struct dm_dirty_log_type *log_type; |
2a23aa1d JB |
25 | |
26 | list_for_each_entry(log_type, &_log_types, list) | |
ec44ab9d | 27 | if (!strcmp(name, log_type->name)) |
2a23aa1d JB |
28 | return log_type; |
29 | ||
30 | return NULL; | |
31 | } | |
32 | ||
ec44ab9d | 33 | static struct dm_dirty_log_type *_get_dirty_log_type(const char *name) |
2a23aa1d | 34 | { |
ec44ab9d | 35 | struct dm_dirty_log_type *log_type; |
1da177e4 LT |
36 | |
37 | spin_lock(&_lock); | |
2a23aa1d JB |
38 | |
39 | log_type = __find_dirty_log_type(name); | |
ec44ab9d | 40 | if (log_type && !try_module_get(log_type->module)) |
84e67c93 | 41 | log_type = NULL; |
1da177e4 LT |
42 | |
43 | spin_unlock(&_lock); | |
2a23aa1d JB |
44 | |
45 | return log_type; | |
1da177e4 LT |
46 | } |
47 | ||
fb8b2848 JB |
48 | /* |
49 | * get_type | |
50 | * @type_name | |
51 | * | |
2a23aa1d | 52 | * Attempt to retrieve the dm_dirty_log_type by name. If not already |
fb8b2848 JB |
53 | * available, attempt to load the appropriate module. |
54 | * | |
55 | * Log modules are named "dm-log-" followed by the 'type_name'. | |
56 | * Modules may contain multiple types. | |
57 | * This function will first try the module "dm-log-<type_name>", | |
58 | * then truncate 'type_name' on the last '-' and try again. | |
59 | * | |
60 | * For example, if type_name was "clustered-disk", it would search | |
61 | * 'dm-log-clustered-disk' then 'dm-log-clustered'. | |
62 | * | |
63 | * Returns: dirty_log_type* on success, NULL on failure | |
64 | */ | |
416cd17b | 65 | static struct dm_dirty_log_type *get_type(const char *type_name) |
fb8b2848 JB |
66 | { |
67 | char *p, *type_name_dup; | |
ec44ab9d | 68 | struct dm_dirty_log_type *log_type; |
fb8b2848 | 69 | |
2a23aa1d JB |
70 | if (!type_name) |
71 | return NULL; | |
72 | ||
73 | log_type = _get_dirty_log_type(type_name); | |
74 | if (log_type) | |
ec44ab9d | 75 | return log_type; |
fb8b2848 JB |
76 | |
77 | type_name_dup = kstrdup(type_name, GFP_KERNEL); | |
78 | if (!type_name_dup) { | |
79 | DMWARN("No memory left to attempt log module load for \"%s\"", | |
80 | type_name); | |
81 | return NULL; | |
82 | } | |
83 | ||
84 | while (request_module("dm-log-%s", type_name_dup) || | |
2a23aa1d | 85 | !(log_type = _get_dirty_log_type(type_name))) { |
fb8b2848 JB |
86 | p = strrchr(type_name_dup, '-'); |
87 | if (!p) | |
88 | break; | |
89 | p[0] = '\0'; | |
90 | } | |
91 | ||
2a23aa1d | 92 | if (!log_type) |
fb8b2848 JB |
93 | DMWARN("Module for logging type \"%s\" not found.", type_name); |
94 | ||
95 | kfree(type_name_dup); | |
96 | ||
ec44ab9d | 97 | return log_type; |
fb8b2848 JB |
98 | } |
99 | ||
416cd17b | 100 | static void put_type(struct dm_dirty_log_type *type) |
1da177e4 | 101 | { |
2a23aa1d JB |
102 | if (!type) |
103 | return; | |
104 | ||
1da177e4 | 105 | spin_lock(&_lock); |
ec44ab9d | 106 | if (!__find_dirty_log_type(type->name)) |
2a23aa1d JB |
107 | goto out; |
108 | ||
84e67c93 | 109 | module_put(type->module); |
2a23aa1d JB |
110 | |
111 | out: | |
1da177e4 LT |
112 | spin_unlock(&_lock); |
113 | } | |
114 | ||
b8206bc3 AK |
115 | int dm_dirty_log_type_register(struct dm_dirty_log_type *type) |
116 | { | |
2a23aa1d JB |
117 | int r = 0; |
118 | ||
b8206bc3 | 119 | spin_lock(&_lock); |
2a23aa1d | 120 | if (!__find_dirty_log_type(type->name)) |
ec44ab9d MS |
121 | list_add(&type->list, &_log_types); |
122 | else | |
2a23aa1d | 123 | r = -EEXIST; |
b8206bc3 AK |
124 | spin_unlock(&_lock); |
125 | ||
2a23aa1d | 126 | return r; |
b8206bc3 AK |
127 | } |
128 | EXPORT_SYMBOL(dm_dirty_log_type_register); | |
129 | ||
130 | int dm_dirty_log_type_unregister(struct dm_dirty_log_type *type) | |
131 | { | |
132 | spin_lock(&_lock); | |
133 | ||
ec44ab9d | 134 | if (!__find_dirty_log_type(type->name)) { |
2a23aa1d JB |
135 | spin_unlock(&_lock); |
136 | return -EINVAL; | |
137 | } | |
138 | ||
ec44ab9d | 139 | list_del(&type->list); |
b8206bc3 AK |
140 | |
141 | spin_unlock(&_lock); | |
142 | ||
143 | return 0; | |
144 | } | |
145 | EXPORT_SYMBOL(dm_dirty_log_type_unregister); | |
146 | ||
416cd17b | 147 | struct dm_dirty_log *dm_dirty_log_create(const char *type_name, |
87a8f240 MP |
148 | struct dm_target *ti, |
149 | int (*flush_callback_fn)(struct dm_target *ti), | |
150 | unsigned int argc, char **argv) | |
1da177e4 | 151 | { |
416cd17b HM |
152 | struct dm_dirty_log_type *type; |
153 | struct dm_dirty_log *log; | |
1da177e4 LT |
154 | |
155 | log = kmalloc(sizeof(*log), GFP_KERNEL); | |
156 | if (!log) | |
157 | return NULL; | |
158 | ||
159 | type = get_type(type_name); | |
160 | if (!type) { | |
161 | kfree(log); | |
162 | return NULL; | |
163 | } | |
164 | ||
87a8f240 | 165 | log->flush_callback_fn = flush_callback_fn; |
1da177e4 LT |
166 | log->type = type; |
167 | if (type->ctr(log, ti, argc, argv)) { | |
168 | kfree(log); | |
169 | put_type(type); | |
170 | return NULL; | |
171 | } | |
172 | ||
173 | return log; | |
174 | } | |
416cd17b | 175 | EXPORT_SYMBOL(dm_dirty_log_create); |
1da177e4 | 176 | |
416cd17b | 177 | void dm_dirty_log_destroy(struct dm_dirty_log *log) |
1da177e4 LT |
178 | { |
179 | log->type->dtr(log); | |
180 | put_type(log->type); | |
181 | kfree(log); | |
182 | } | |
416cd17b | 183 | EXPORT_SYMBOL(dm_dirty_log_destroy); |
1da177e4 LT |
184 | |
185 | /*----------------------------------------------------------------- | |
186 | * Persistent and core logs share a lot of their implementation. | |
187 | * FIXME: need a reload method to be called from a resume | |
188 | *---------------------------------------------------------------*/ | |
189 | /* | |
190 | * Magic for persistent mirrors: "MiRr" | |
191 | */ | |
192 | #define MIRROR_MAGIC 0x4D695272 | |
193 | ||
194 | /* | |
195 | * The on-disk version of the metadata. | |
196 | */ | |
a4fc4717 | 197 | #define MIRROR_DISK_VERSION 2 |
1da177e4 LT |
198 | #define LOG_OFFSET 2 |
199 | ||
200 | struct log_header { | |
201 | uint32_t magic; | |
202 | ||
203 | /* | |
204 | * Simple, incrementing version. no backward | |
205 | * compatibility. | |
206 | */ | |
207 | uint32_t version; | |
208 | sector_t nr_regions; | |
209 | }; | |
210 | ||
211 | struct log_c { | |
212 | struct dm_target *ti; | |
b09acf1a MP |
213 | int touched_dirtied; |
214 | int touched_cleaned; | |
5adc78d0 | 215 | int flush_failed; |
1da177e4 LT |
216 | uint32_t region_size; |
217 | unsigned int region_count; | |
218 | region_t sync_count; | |
219 | ||
220 | unsigned bitset_uint32_count; | |
221 | uint32_t *clean_bits; | |
222 | uint32_t *sync_bits; | |
223 | uint32_t *recovering_bits; /* FIXME: this seems excessive */ | |
224 | ||
225 | int sync_search; | |
226 | ||
227 | /* Resync flag */ | |
228 | enum sync { | |
229 | DEFAULTSYNC, /* Synchronize if necessary */ | |
230 | NOSYNC, /* Devices known to be already in sync */ | |
231 | FORCESYNC, /* Force a sync to happen */ | |
232 | } sync; | |
233 | ||
5d234d1e HM |
234 | struct dm_io_request io_req; |
235 | ||
1da177e4 LT |
236 | /* |
237 | * Disk log fields | |
238 | */ | |
01d03a66 | 239 | int log_dev_failed; |
1da177e4 LT |
240 | struct dm_dev *log_dev; |
241 | struct log_header header; | |
242 | ||
22a1ceb1 | 243 | struct dm_io_region header_location; |
1da177e4 | 244 | struct log_header *disk_header; |
1da177e4 LT |
245 | }; |
246 | ||
247 | /* | |
248 | * The touched member needs to be updated every time we access | |
249 | * one of the bitsets. | |
250 | */ | |
416cd17b | 251 | static inline int log_test_bit(uint32_t *bs, unsigned bit) |
1da177e4 | 252 | { |
a4fc4717 | 253 | return ext2_test_bit(bit, (unsigned long *) bs) ? 1 : 0; |
1da177e4 LT |
254 | } |
255 | ||
256 | static inline void log_set_bit(struct log_c *l, | |
257 | uint32_t *bs, unsigned bit) | |
258 | { | |
a4fc4717 | 259 | ext2_set_bit(bit, (unsigned long *) bs); |
b09acf1a | 260 | l->touched_cleaned = 1; |
1da177e4 LT |
261 | } |
262 | ||
263 | static inline void log_clear_bit(struct log_c *l, | |
264 | uint32_t *bs, unsigned bit) | |
265 | { | |
a4fc4717 | 266 | ext2_clear_bit(bit, (unsigned long *) bs); |
b09acf1a | 267 | l->touched_dirtied = 1; |
1da177e4 LT |
268 | } |
269 | ||
270 | /*---------------------------------------------------------------- | |
271 | * Header IO | |
272 | *--------------------------------------------------------------*/ | |
273 | static void header_to_disk(struct log_header *core, struct log_header *disk) | |
274 | { | |
275 | disk->magic = cpu_to_le32(core->magic); | |
276 | disk->version = cpu_to_le32(core->version); | |
277 | disk->nr_regions = cpu_to_le64(core->nr_regions); | |
278 | } | |
279 | ||
280 | static void header_from_disk(struct log_header *core, struct log_header *disk) | |
281 | { | |
282 | core->magic = le32_to_cpu(disk->magic); | |
283 | core->version = le32_to_cpu(disk->version); | |
284 | core->nr_regions = le64_to_cpu(disk->nr_regions); | |
285 | } | |
286 | ||
5d234d1e HM |
287 | static int rw_header(struct log_c *lc, int rw) |
288 | { | |
289 | lc->io_req.bi_rw = rw; | |
5d234d1e HM |
290 | |
291 | return dm_io(&lc->io_req, 1, &lc->header_location, NULL); | |
292 | } | |
293 | ||
20a34a8e MP |
294 | static int flush_header(struct log_c *lc) |
295 | { | |
296 | struct dm_io_region null_location = { | |
297 | .bdev = lc->header_location.bdev, | |
298 | .sector = 0, | |
299 | .count = 0, | |
300 | }; | |
301 | ||
302 | lc->io_req.bi_rw = WRITE_BARRIER; | |
303 | ||
304 | return dm_io(&lc->io_req, 1, &null_location, NULL); | |
305 | } | |
306 | ||
1da177e4 LT |
307 | static int read_header(struct log_c *log) |
308 | { | |
309 | int r; | |
1da177e4 | 310 | |
5d234d1e | 311 | r = rw_header(log, READ); |
1da177e4 LT |
312 | if (r) |
313 | return r; | |
314 | ||
315 | header_from_disk(&log->header, log->disk_header); | |
316 | ||
317 | /* New log required? */ | |
318 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { | |
319 | log->header.magic = MIRROR_MAGIC; | |
320 | log->header.version = MIRROR_DISK_VERSION; | |
321 | log->header.nr_regions = 0; | |
322 | } | |
323 | ||
a4fc4717 PC |
324 | #ifdef __LITTLE_ENDIAN |
325 | if (log->header.version == 1) | |
326 | log->header.version = 2; | |
327 | #endif | |
328 | ||
1da177e4 LT |
329 | if (log->header.version != MIRROR_DISK_VERSION) { |
330 | DMWARN("incompatible disk log version"); | |
331 | return -EINVAL; | |
332 | } | |
333 | ||
334 | return 0; | |
335 | } | |
336 | ||
2045e88e MB |
337 | static int _check_region_size(struct dm_target *ti, uint32_t region_size) |
338 | { | |
339 | if (region_size < 2 || region_size > ti->len) | |
340 | return 0; | |
341 | ||
342 | if (!is_power_of_2(region_size)) | |
343 | return 0; | |
344 | ||
345 | return 1; | |
346 | } | |
347 | ||
1da177e4 LT |
348 | /*---------------------------------------------------------------- |
349 | * core log constructor/destructor | |
350 | * | |
351 | * argv contains region_size followed optionally by [no]sync | |
352 | *--------------------------------------------------------------*/ | |
353 | #define BYTE_SHIFT 3 | |
416cd17b | 354 | static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
355 | unsigned int argc, char **argv, |
356 | struct dm_dev *dev) | |
1da177e4 LT |
357 | { |
358 | enum sync sync = DEFAULTSYNC; | |
359 | ||
360 | struct log_c *lc; | |
361 | uint32_t region_size; | |
362 | unsigned int region_count; | |
b7cca195 | 363 | size_t bitset_size, buf_size; |
5d234d1e | 364 | int r; |
1da177e4 LT |
365 | |
366 | if (argc < 1 || argc > 2) { | |
b7fd54a7 | 367 | DMWARN("wrong number of arguments to dirty region log"); |
1da177e4 LT |
368 | return -EINVAL; |
369 | } | |
370 | ||
371 | if (argc > 1) { | |
372 | if (!strcmp(argv[1], "sync")) | |
373 | sync = FORCESYNC; | |
374 | else if (!strcmp(argv[1], "nosync")) | |
375 | sync = NOSYNC; | |
376 | else { | |
b7fd54a7 HM |
377 | DMWARN("unrecognised sync argument to " |
378 | "dirty region log: %s", argv[1]); | |
1da177e4 LT |
379 | return -EINVAL; |
380 | } | |
381 | } | |
382 | ||
2045e88e MB |
383 | if (sscanf(argv[0], "%u", ®ion_size) != 1 || |
384 | !_check_region_size(ti, region_size)) { | |
385 | DMWARN("invalid region size %s", argv[0]); | |
1da177e4 LT |
386 | return -EINVAL; |
387 | } | |
388 | ||
389 | region_count = dm_sector_div_up(ti->len, region_size); | |
390 | ||
391 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
392 | if (!lc) { | |
393 | DMWARN("couldn't allocate core log"); | |
394 | return -ENOMEM; | |
395 | } | |
396 | ||
397 | lc->ti = ti; | |
b09acf1a MP |
398 | lc->touched_dirtied = 0; |
399 | lc->touched_cleaned = 0; | |
5adc78d0 | 400 | lc->flush_failed = 0; |
1da177e4 LT |
401 | lc->region_size = region_size; |
402 | lc->region_count = region_count; | |
403 | lc->sync = sync; | |
404 | ||
405 | /* | |
0e56822d | 406 | * Work out how many "unsigned long"s we need to hold the bitset. |
1da177e4 LT |
407 | */ |
408 | bitset_size = dm_round_up(region_count, | |
29121bd0 | 409 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
1da177e4 LT |
410 | bitset_size >>= BYTE_SHIFT; |
411 | ||
29121bd0 | 412 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
b7cca195 AK |
413 | |
414 | /* | |
415 | * Disk log? | |
416 | */ | |
417 | if (!dev) { | |
418 | lc->clean_bits = vmalloc(bitset_size); | |
419 | if (!lc->clean_bits) { | |
420 | DMWARN("couldn't allocate clean bitset"); | |
421 | kfree(lc); | |
422 | return -ENOMEM; | |
423 | } | |
424 | lc->disk_header = NULL; | |
425 | } else { | |
426 | lc->log_dev = dev; | |
01d03a66 | 427 | lc->log_dev_failed = 0; |
b7cca195 AK |
428 | lc->header_location.bdev = lc->log_dev->bdev; |
429 | lc->header_location.sector = 0; | |
430 | ||
431 | /* | |
432 | * Buffer holds both header and bitset. | |
433 | */ | |
18d8594d MS |
434 | buf_size = |
435 | dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, | |
436 | bdev_logical_block_size(lc->header_location. | |
437 | bdev)); | |
ac1f0ac2 | 438 | |
5657e8fa | 439 | if (buf_size > i_size_read(dev->bdev->bd_inode)) { |
ac1f0ac2 MB |
440 | DMWARN("log device %s too small: need %llu bytes", |
441 | dev->name, (unsigned long long)buf_size); | |
442 | kfree(lc); | |
443 | return -EINVAL; | |
444 | } | |
445 | ||
b7cca195 | 446 | lc->header_location.count = buf_size >> SECTOR_SHIFT; |
6f3af01c | 447 | |
5d234d1e | 448 | lc->io_req.mem.type = DM_IO_VMA; |
6f3af01c | 449 | lc->io_req.notify.fn = NULL; |
5d234d1e HM |
450 | lc->io_req.client = dm_io_client_create(dm_div_up(buf_size, |
451 | PAGE_SIZE)); | |
452 | if (IS_ERR(lc->io_req.client)) { | |
453 | r = PTR_ERR(lc->io_req.client); | |
454 | DMWARN("couldn't allocate disk io client"); | |
455 | kfree(lc); | |
456 | return -ENOMEM; | |
457 | } | |
b7cca195 AK |
458 | |
459 | lc->disk_header = vmalloc(buf_size); | |
460 | if (!lc->disk_header) { | |
461 | DMWARN("couldn't allocate disk log buffer"); | |
c7a2bd19 | 462 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 AK |
463 | kfree(lc); |
464 | return -ENOMEM; | |
465 | } | |
466 | ||
6f3af01c | 467 | lc->io_req.mem.ptr.vma = lc->disk_header; |
b7cca195 AK |
468 | lc->clean_bits = (void *)lc->disk_header + |
469 | (LOG_OFFSET << SECTOR_SHIFT); | |
1da177e4 | 470 | } |
b7cca195 | 471 | |
1da177e4 LT |
472 | memset(lc->clean_bits, -1, bitset_size); |
473 | ||
474 | lc->sync_bits = vmalloc(bitset_size); | |
475 | if (!lc->sync_bits) { | |
476 | DMWARN("couldn't allocate sync bitset"); | |
b7cca195 AK |
477 | if (!dev) |
478 | vfree(lc->clean_bits); | |
c7a2bd19 TY |
479 | else |
480 | dm_io_client_destroy(lc->io_req.client); | |
b7cca195 | 481 | vfree(lc->disk_header); |
1da177e4 LT |
482 | kfree(lc); |
483 | return -ENOMEM; | |
484 | } | |
485 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); | |
486 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; | |
487 | ||
488 | lc->recovering_bits = vmalloc(bitset_size); | |
489 | if (!lc->recovering_bits) { | |
490 | DMWARN("couldn't allocate sync bitset"); | |
491 | vfree(lc->sync_bits); | |
b7cca195 AK |
492 | if (!dev) |
493 | vfree(lc->clean_bits); | |
c7a2bd19 TY |
494 | else |
495 | dm_io_client_destroy(lc->io_req.client); | |
b7cca195 | 496 | vfree(lc->disk_header); |
1da177e4 LT |
497 | kfree(lc); |
498 | return -ENOMEM; | |
499 | } | |
500 | memset(lc->recovering_bits, 0, bitset_size); | |
501 | lc->sync_search = 0; | |
502 | log->context = lc; | |
b7cca195 | 503 | |
1da177e4 LT |
504 | return 0; |
505 | } | |
506 | ||
416cd17b | 507 | static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
508 | unsigned int argc, char **argv) |
509 | { | |
510 | return create_log_context(log, ti, argc, argv, NULL); | |
511 | } | |
512 | ||
513 | static void destroy_log_context(struct log_c *lc) | |
1da177e4 | 514 | { |
1da177e4 LT |
515 | vfree(lc->sync_bits); |
516 | vfree(lc->recovering_bits); | |
517 | kfree(lc); | |
518 | } | |
519 | ||
416cd17b | 520 | static void core_dtr(struct dm_dirty_log *log) |
b7cca195 AK |
521 | { |
522 | struct log_c *lc = (struct log_c *) log->context; | |
523 | ||
524 | vfree(lc->clean_bits); | |
525 | destroy_log_context(lc); | |
526 | } | |
527 | ||
1da177e4 LT |
528 | /*---------------------------------------------------------------- |
529 | * disk log constructor/destructor | |
530 | * | |
531 | * argv contains log_device region_size followed optionally by [no]sync | |
532 | *--------------------------------------------------------------*/ | |
416cd17b | 533 | static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
1da177e4 LT |
534 | unsigned int argc, char **argv) |
535 | { | |
536 | int r; | |
1da177e4 LT |
537 | struct dm_dev *dev; |
538 | ||
539 | if (argc < 2 || argc > 3) { | |
b7fd54a7 | 540 | DMWARN("wrong number of arguments to disk dirty region log"); |
1da177e4 LT |
541 | return -EINVAL; |
542 | } | |
543 | ||
544 | r = dm_get_device(ti, argv[0], 0, 0 /* FIXME */, | |
545 | FMODE_READ | FMODE_WRITE, &dev); | |
546 | if (r) | |
547 | return r; | |
548 | ||
b7cca195 | 549 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
1da177e4 LT |
550 | if (r) { |
551 | dm_put_device(ti, dev); | |
552 | return r; | |
553 | } | |
554 | ||
1da177e4 | 555 | return 0; |
1da177e4 LT |
556 | } |
557 | ||
416cd17b | 558 | static void disk_dtr(struct dm_dirty_log *log) |
1da177e4 LT |
559 | { |
560 | struct log_c *lc = (struct log_c *) log->context; | |
b7cca195 | 561 | |
1da177e4 LT |
562 | dm_put_device(lc->ti, lc->log_dev); |
563 | vfree(lc->disk_header); | |
5d234d1e | 564 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 | 565 | destroy_log_context(lc); |
1da177e4 LT |
566 | } |
567 | ||
568 | static int count_bits32(uint32_t *addr, unsigned size) | |
569 | { | |
570 | int count = 0, i; | |
571 | ||
572 | for (i = 0; i < size; i++) { | |
573 | count += hweight32(*(addr+i)); | |
574 | } | |
575 | return count; | |
576 | } | |
577 | ||
01d03a66 JB |
578 | static void fail_log_device(struct log_c *lc) |
579 | { | |
580 | if (lc->log_dev_failed) | |
581 | return; | |
582 | ||
583 | lc->log_dev_failed = 1; | |
584 | dm_table_event(lc->ti->table); | |
585 | } | |
586 | ||
416cd17b | 587 | static int disk_resume(struct dm_dirty_log *log) |
1da177e4 LT |
588 | { |
589 | int r; | |
590 | unsigned i; | |
591 | struct log_c *lc = (struct log_c *) log->context; | |
592 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); | |
593 | ||
594 | /* read the disk header */ | |
595 | r = read_header(lc); | |
01d03a66 | 596 | if (r) { |
b7fd54a7 | 597 | DMWARN("%s: Failed to read header on dirty region log device", |
01d03a66 JB |
598 | lc->log_dev->name); |
599 | fail_log_device(lc); | |
ba8b45ce JB |
600 | /* |
601 | * If the log device cannot be read, we must assume | |
602 | * all regions are out-of-sync. If we simply return | |
603 | * here, the state will be uninitialized and could | |
604 | * lead us to return 'in-sync' status for regions | |
605 | * that are actually 'out-of-sync'. | |
606 | */ | |
607 | lc->header.nr_regions = 0; | |
01d03a66 | 608 | } |
1da177e4 | 609 | |
8a835f11 | 610 | /* set or clear any new bits -- device has grown */ |
1da177e4 LT |
611 | if (lc->sync == NOSYNC) |
612 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
613 | /* FIXME: amazingly inefficient */ | |
614 | log_set_bit(lc, lc->clean_bits, i); | |
615 | else | |
616 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
617 | /* FIXME: amazingly inefficient */ | |
618 | log_clear_bit(lc, lc->clean_bits, i); | |
619 | ||
8a835f11 AK |
620 | /* clear any old bits -- device has shrunk */ |
621 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) | |
622 | log_clear_bit(lc, lc->clean_bits, i); | |
623 | ||
1da177e4 LT |
624 | /* copy clean across to sync */ |
625 | memcpy(lc->sync_bits, lc->clean_bits, size); | |
626 | lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); | |
88b20a1a | 627 | lc->sync_search = 0; |
1da177e4 | 628 | |
1da177e4 LT |
629 | /* set the correct number of regions in the header */ |
630 | lc->header.nr_regions = lc->region_count; | |
631 | ||
6f3af01c TY |
632 | header_to_disk(&lc->header, lc->disk_header); |
633 | ||
1da177e4 | 634 | /* write the new header */ |
6f3af01c | 635 | r = rw_header(lc, WRITE); |
20a34a8e MP |
636 | if (!r) |
637 | r = flush_header(lc); | |
01d03a66 | 638 | if (r) { |
b7fd54a7 | 639 | DMWARN("%s: Failed to write header on dirty region log device", |
01d03a66 JB |
640 | lc->log_dev->name); |
641 | fail_log_device(lc); | |
642 | } | |
643 | ||
644 | return r; | |
1da177e4 LT |
645 | } |
646 | ||
416cd17b | 647 | static uint32_t core_get_region_size(struct dm_dirty_log *log) |
1da177e4 LT |
648 | { |
649 | struct log_c *lc = (struct log_c *) log->context; | |
650 | return lc->region_size; | |
651 | } | |
652 | ||
416cd17b | 653 | static int core_resume(struct dm_dirty_log *log) |
88b20a1a JB |
654 | { |
655 | struct log_c *lc = (struct log_c *) log->context; | |
656 | lc->sync_search = 0; | |
657 | return 0; | |
658 | } | |
659 | ||
416cd17b | 660 | static int core_is_clean(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
661 | { |
662 | struct log_c *lc = (struct log_c *) log->context; | |
663 | return log_test_bit(lc->clean_bits, region); | |
664 | } | |
665 | ||
416cd17b | 666 | static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) |
1da177e4 LT |
667 | { |
668 | struct log_c *lc = (struct log_c *) log->context; | |
669 | return log_test_bit(lc->sync_bits, region); | |
670 | } | |
671 | ||
416cd17b | 672 | static int core_flush(struct dm_dirty_log *log) |
1da177e4 LT |
673 | { |
674 | /* no op */ | |
675 | return 0; | |
676 | } | |
677 | ||
416cd17b | 678 | static int disk_flush(struct dm_dirty_log *log) |
1da177e4 LT |
679 | { |
680 | int r; | |
681 | struct log_c *lc = (struct log_c *) log->context; | |
682 | ||
683 | /* only write if the log has changed */ | |
b09acf1a | 684 | if (!lc->touched_cleaned && !lc->touched_dirtied) |
1da177e4 LT |
685 | return 0; |
686 | ||
6f3af01c | 687 | r = rw_header(lc, WRITE); |
01d03a66 JB |
688 | if (r) |
689 | fail_log_device(lc); | |
b09acf1a | 690 | else { |
20a34a8e MP |
691 | if (lc->touched_dirtied) { |
692 | r = flush_header(lc); | |
693 | if (r) | |
694 | fail_log_device(lc); | |
695 | else | |
696 | lc->touched_dirtied = 0; | |
697 | } | |
b09acf1a MP |
698 | lc->touched_cleaned = 0; |
699 | } | |
1da177e4 LT |
700 | |
701 | return r; | |
702 | } | |
703 | ||
416cd17b | 704 | static void core_mark_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
705 | { |
706 | struct log_c *lc = (struct log_c *) log->context; | |
707 | log_clear_bit(lc, lc->clean_bits, region); | |
708 | } | |
709 | ||
416cd17b | 710 | static void core_clear_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
711 | { |
712 | struct log_c *lc = (struct log_c *) log->context; | |
5adc78d0 MP |
713 | if (likely(!lc->flush_failed)) |
714 | log_set_bit(lc, lc->clean_bits, region); | |
1da177e4 LT |
715 | } |
716 | ||
416cd17b | 717 | static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) |
1da177e4 LT |
718 | { |
719 | struct log_c *lc = (struct log_c *) log->context; | |
720 | ||
721 | if (lc->sync_search >= lc->region_count) | |
722 | return 0; | |
723 | ||
724 | do { | |
1113a7e9 SB |
725 | *region = ext2_find_next_zero_bit( |
726 | (unsigned long *) lc->sync_bits, | |
1da177e4 LT |
727 | lc->region_count, |
728 | lc->sync_search); | |
729 | lc->sync_search = *region + 1; | |
730 | ||
ac81b2ee | 731 | if (*region >= lc->region_count) |
1da177e4 LT |
732 | return 0; |
733 | ||
734 | } while (log_test_bit(lc->recovering_bits, *region)); | |
735 | ||
736 | log_set_bit(lc, lc->recovering_bits, *region); | |
737 | return 1; | |
738 | } | |
739 | ||
416cd17b | 740 | static void core_set_region_sync(struct dm_dirty_log *log, region_t region, |
f3ee6b2f | 741 | int in_sync) |
1da177e4 LT |
742 | { |
743 | struct log_c *lc = (struct log_c *) log->context; | |
744 | ||
745 | log_clear_bit(lc, lc->recovering_bits, region); | |
f3ee6b2f | 746 | if (in_sync) { |
1da177e4 LT |
747 | log_set_bit(lc, lc->sync_bits, region); |
748 | lc->sync_count++; | |
f3ee6b2f JB |
749 | } else if (log_test_bit(lc->sync_bits, region)) { |
750 | lc->sync_count--; | |
751 | log_clear_bit(lc, lc->sync_bits, region); | |
752 | } | |
1da177e4 LT |
753 | } |
754 | ||
416cd17b | 755 | static region_t core_get_sync_count(struct dm_dirty_log *log) |
1da177e4 LT |
756 | { |
757 | struct log_c *lc = (struct log_c *) log->context; | |
758 | ||
759 | return lc->sync_count; | |
760 | } | |
761 | ||
762 | #define DMEMIT_SYNC \ | |
763 | if (lc->sync != DEFAULTSYNC) \ | |
764 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") | |
765 | ||
416cd17b | 766 | static int core_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
767 | char *result, unsigned int maxlen) |
768 | { | |
769 | int sz = 0; | |
770 | struct log_c *lc = log->context; | |
771 | ||
772 | switch(status) { | |
773 | case STATUSTYPE_INFO: | |
315dcc22 | 774 | DMEMIT("1 %s", log->type->name); |
1da177e4 LT |
775 | break; |
776 | ||
777 | case STATUSTYPE_TABLE: | |
778 | DMEMIT("%s %u %u ", log->type->name, | |
779 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); | |
780 | DMEMIT_SYNC; | |
781 | } | |
782 | ||
783 | return sz; | |
784 | } | |
785 | ||
416cd17b | 786 | static int disk_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
787 | char *result, unsigned int maxlen) |
788 | { | |
789 | int sz = 0; | |
1da177e4 LT |
790 | struct log_c *lc = log->context; |
791 | ||
792 | switch(status) { | |
793 | case STATUSTYPE_INFO: | |
315dcc22 JB |
794 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
795 | lc->log_dev_failed ? 'D' : 'A'); | |
1da177e4 LT |
796 | break; |
797 | ||
798 | case STATUSTYPE_TABLE: | |
1da177e4 | 799 | DMEMIT("%s %u %s %u ", log->type->name, |
315dcc22 | 800 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
1da177e4 LT |
801 | lc->region_size); |
802 | DMEMIT_SYNC; | |
803 | } | |
804 | ||
805 | return sz; | |
806 | } | |
807 | ||
416cd17b | 808 | static struct dm_dirty_log_type _core_type = { |
1da177e4 LT |
809 | .name = "core", |
810 | .module = THIS_MODULE, | |
811 | .ctr = core_ctr, | |
812 | .dtr = core_dtr, | |
88b20a1a | 813 | .resume = core_resume, |
1da177e4 LT |
814 | .get_region_size = core_get_region_size, |
815 | .is_clean = core_is_clean, | |
816 | .in_sync = core_in_sync, | |
817 | .flush = core_flush, | |
818 | .mark_region = core_mark_region, | |
819 | .clear_region = core_clear_region, | |
820 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 821 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
822 | .get_sync_count = core_get_sync_count, |
823 | .status = core_status, | |
824 | }; | |
825 | ||
416cd17b | 826 | static struct dm_dirty_log_type _disk_type = { |
1da177e4 LT |
827 | .name = "disk", |
828 | .module = THIS_MODULE, | |
829 | .ctr = disk_ctr, | |
830 | .dtr = disk_dtr, | |
6b3df0d7 | 831 | .postsuspend = disk_flush, |
1da177e4 LT |
832 | .resume = disk_resume, |
833 | .get_region_size = core_get_region_size, | |
834 | .is_clean = core_is_clean, | |
835 | .in_sync = core_in_sync, | |
836 | .flush = disk_flush, | |
837 | .mark_region = core_mark_region, | |
838 | .clear_region = core_clear_region, | |
839 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 840 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
841 | .get_sync_count = core_get_sync_count, |
842 | .status = disk_status, | |
843 | }; | |
844 | ||
c8da2f8d | 845 | static int __init dm_dirty_log_init(void) |
1da177e4 LT |
846 | { |
847 | int r; | |
848 | ||
416cd17b | 849 | r = dm_dirty_log_type_register(&_core_type); |
1da177e4 LT |
850 | if (r) |
851 | DMWARN("couldn't register core log"); | |
852 | ||
416cd17b | 853 | r = dm_dirty_log_type_register(&_disk_type); |
1da177e4 LT |
854 | if (r) { |
855 | DMWARN("couldn't register disk type"); | |
416cd17b | 856 | dm_dirty_log_type_unregister(&_core_type); |
1da177e4 LT |
857 | } |
858 | ||
859 | return r; | |
860 | } | |
861 | ||
c8da2f8d | 862 | static void __exit dm_dirty_log_exit(void) |
1da177e4 | 863 | { |
416cd17b HM |
864 | dm_dirty_log_type_unregister(&_disk_type); |
865 | dm_dirty_log_type_unregister(&_core_type); | |
1da177e4 LT |
866 | } |
867 | ||
769aef30 HM |
868 | module_init(dm_dirty_log_init); |
869 | module_exit(dm_dirty_log_exit); | |
870 | ||
871 | MODULE_DESCRIPTION(DM_NAME " dirty region log"); | |
872 | MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); | |
873 | MODULE_LICENSE("GPL"); |