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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> | |
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 | ||
283a8328 AK |
200 | struct log_header_disk { |
201 | __le32 magic; | |
1da177e4 LT |
202 | |
203 | /* | |
204 | * Simple, incrementing version. no backward | |
205 | * compatibility. | |
206 | */ | |
283a8328 AK |
207 | __le32 version; |
208 | __le64 nr_regions; | |
209 | } __packed; | |
210 | ||
211 | struct log_header_core { | |
212 | uint32_t magic; | |
1da177e4 | 213 | uint32_t version; |
283a8328 | 214 | uint64_t nr_regions; |
1da177e4 LT |
215 | }; |
216 | ||
217 | struct log_c { | |
218 | struct dm_target *ti; | |
b09acf1a MP |
219 | int touched_dirtied; |
220 | int touched_cleaned; | |
5adc78d0 | 221 | int flush_failed; |
1da177e4 LT |
222 | uint32_t region_size; |
223 | unsigned int region_count; | |
224 | region_t sync_count; | |
225 | ||
226 | unsigned bitset_uint32_count; | |
227 | uint32_t *clean_bits; | |
228 | uint32_t *sync_bits; | |
229 | uint32_t *recovering_bits; /* FIXME: this seems excessive */ | |
230 | ||
231 | int sync_search; | |
232 | ||
233 | /* Resync flag */ | |
234 | enum sync { | |
235 | DEFAULTSYNC, /* Synchronize if necessary */ | |
236 | NOSYNC, /* Devices known to be already in sync */ | |
237 | FORCESYNC, /* Force a sync to happen */ | |
238 | } sync; | |
239 | ||
5d234d1e HM |
240 | struct dm_io_request io_req; |
241 | ||
1da177e4 LT |
242 | /* |
243 | * Disk log fields | |
244 | */ | |
01d03a66 | 245 | int log_dev_failed; |
64b30c46 | 246 | int log_dev_flush_failed; |
1da177e4 | 247 | struct dm_dev *log_dev; |
283a8328 | 248 | struct log_header_core header; |
1da177e4 | 249 | |
22a1ceb1 | 250 | struct dm_io_region header_location; |
283a8328 | 251 | struct log_header_disk *disk_header; |
1da177e4 LT |
252 | }; |
253 | ||
254 | /* | |
255 | * The touched member needs to be updated every time we access | |
256 | * one of the bitsets. | |
257 | */ | |
416cd17b | 258 | static inline int log_test_bit(uint32_t *bs, unsigned bit) |
1da177e4 | 259 | { |
c8f543e0 | 260 | return test_bit_le(bit, bs) ? 1 : 0; |
1da177e4 LT |
261 | } |
262 | ||
263 | static inline void log_set_bit(struct log_c *l, | |
264 | uint32_t *bs, unsigned bit) | |
265 | { | |
c8f543e0 | 266 | __set_bit_le(bit, bs); |
b09acf1a | 267 | l->touched_cleaned = 1; |
1da177e4 LT |
268 | } |
269 | ||
270 | static inline void log_clear_bit(struct log_c *l, | |
271 | uint32_t *bs, unsigned bit) | |
272 | { | |
c8f543e0 | 273 | __clear_bit_le(bit, bs); |
b09acf1a | 274 | l->touched_dirtied = 1; |
1da177e4 LT |
275 | } |
276 | ||
277 | /*---------------------------------------------------------------- | |
278 | * Header IO | |
279 | *--------------------------------------------------------------*/ | |
283a8328 | 280 | static void header_to_disk(struct log_header_core *core, struct log_header_disk *disk) |
1da177e4 LT |
281 | { |
282 | disk->magic = cpu_to_le32(core->magic); | |
283 | disk->version = cpu_to_le32(core->version); | |
284 | disk->nr_regions = cpu_to_le64(core->nr_regions); | |
285 | } | |
286 | ||
283a8328 | 287 | static void header_from_disk(struct log_header_core *core, struct log_header_disk *disk) |
1da177e4 LT |
288 | { |
289 | core->magic = le32_to_cpu(disk->magic); | |
290 | core->version = le32_to_cpu(disk->version); | |
291 | core->nr_regions = le64_to_cpu(disk->nr_regions); | |
292 | } | |
293 | ||
5d234d1e HM |
294 | static int rw_header(struct log_c *lc, int rw) |
295 | { | |
e6047149 | 296 | lc->io_req.bi_op = rw; |
5d234d1e HM |
297 | |
298 | return dm_io(&lc->io_req, 1, &lc->header_location, NULL); | |
299 | } | |
300 | ||
20a34a8e MP |
301 | static int flush_header(struct log_c *lc) |
302 | { | |
303 | struct dm_io_region null_location = { | |
304 | .bdev = lc->header_location.bdev, | |
305 | .sector = 0, | |
306 | .count = 0, | |
307 | }; | |
308 | ||
e6047149 MC |
309 | lc->io_req.bi_op = REQ_OP_WRITE; |
310 | lc->io_req.bi_op_flags = WRITE_FLUSH; | |
20a34a8e MP |
311 | |
312 | return dm_io(&lc->io_req, 1, &null_location, NULL); | |
313 | } | |
314 | ||
1da177e4 LT |
315 | static int read_header(struct log_c *log) |
316 | { | |
317 | int r; | |
1da177e4 | 318 | |
5d234d1e | 319 | r = rw_header(log, READ); |
1da177e4 LT |
320 | if (r) |
321 | return r; | |
322 | ||
323 | header_from_disk(&log->header, log->disk_header); | |
324 | ||
325 | /* New log required? */ | |
326 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { | |
327 | log->header.magic = MIRROR_MAGIC; | |
328 | log->header.version = MIRROR_DISK_VERSION; | |
329 | log->header.nr_regions = 0; | |
330 | } | |
331 | ||
a4fc4717 PC |
332 | #ifdef __LITTLE_ENDIAN |
333 | if (log->header.version == 1) | |
334 | log->header.version = 2; | |
335 | #endif | |
336 | ||
1da177e4 LT |
337 | if (log->header.version != MIRROR_DISK_VERSION) { |
338 | DMWARN("incompatible disk log version"); | |
339 | return -EINVAL; | |
340 | } | |
341 | ||
342 | return 0; | |
343 | } | |
344 | ||
2045e88e MB |
345 | static int _check_region_size(struct dm_target *ti, uint32_t region_size) |
346 | { | |
347 | if (region_size < 2 || region_size > ti->len) | |
348 | return 0; | |
349 | ||
350 | if (!is_power_of_2(region_size)) | |
351 | return 0; | |
352 | ||
353 | return 1; | |
354 | } | |
355 | ||
1da177e4 LT |
356 | /*---------------------------------------------------------------- |
357 | * core log constructor/destructor | |
358 | * | |
359 | * argv contains region_size followed optionally by [no]sync | |
360 | *--------------------------------------------------------------*/ | |
361 | #define BYTE_SHIFT 3 | |
416cd17b | 362 | static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
363 | unsigned int argc, char **argv, |
364 | struct dm_dev *dev) | |
1da177e4 LT |
365 | { |
366 | enum sync sync = DEFAULTSYNC; | |
367 | ||
368 | struct log_c *lc; | |
369 | uint32_t region_size; | |
370 | unsigned int region_count; | |
b7cca195 | 371 | size_t bitset_size, buf_size; |
5d234d1e | 372 | int r; |
31998ef1 | 373 | char dummy; |
1da177e4 LT |
374 | |
375 | if (argc < 1 || argc > 2) { | |
b7fd54a7 | 376 | DMWARN("wrong number of arguments to dirty region log"); |
1da177e4 LT |
377 | return -EINVAL; |
378 | } | |
379 | ||
380 | if (argc > 1) { | |
381 | if (!strcmp(argv[1], "sync")) | |
382 | sync = FORCESYNC; | |
383 | else if (!strcmp(argv[1], "nosync")) | |
384 | sync = NOSYNC; | |
385 | else { | |
b7fd54a7 HM |
386 | DMWARN("unrecognised sync argument to " |
387 | "dirty region log: %s", argv[1]); | |
1da177e4 LT |
388 | return -EINVAL; |
389 | } | |
390 | } | |
391 | ||
31998ef1 | 392 | if (sscanf(argv[0], "%u%c", ®ion_size, &dummy) != 1 || |
2045e88e MB |
393 | !_check_region_size(ti, region_size)) { |
394 | DMWARN("invalid region size %s", argv[0]); | |
1da177e4 LT |
395 | return -EINVAL; |
396 | } | |
397 | ||
398 | region_count = dm_sector_div_up(ti->len, region_size); | |
399 | ||
400 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
401 | if (!lc) { | |
402 | DMWARN("couldn't allocate core log"); | |
403 | return -ENOMEM; | |
404 | } | |
405 | ||
406 | lc->ti = ti; | |
b09acf1a MP |
407 | lc->touched_dirtied = 0; |
408 | lc->touched_cleaned = 0; | |
5adc78d0 | 409 | lc->flush_failed = 0; |
1da177e4 LT |
410 | lc->region_size = region_size; |
411 | lc->region_count = region_count; | |
412 | lc->sync = sync; | |
413 | ||
414 | /* | |
0e56822d | 415 | * Work out how many "unsigned long"s we need to hold the bitset. |
1da177e4 LT |
416 | */ |
417 | bitset_size = dm_round_up(region_count, | |
29121bd0 | 418 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
1da177e4 LT |
419 | bitset_size >>= BYTE_SHIFT; |
420 | ||
29121bd0 | 421 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
b7cca195 AK |
422 | |
423 | /* | |
424 | * Disk log? | |
425 | */ | |
426 | if (!dev) { | |
427 | lc->clean_bits = vmalloc(bitset_size); | |
428 | if (!lc->clean_bits) { | |
429 | DMWARN("couldn't allocate clean bitset"); | |
430 | kfree(lc); | |
431 | return -ENOMEM; | |
432 | } | |
433 | lc->disk_header = NULL; | |
434 | } else { | |
435 | lc->log_dev = dev; | |
01d03a66 | 436 | lc->log_dev_failed = 0; |
64b30c46 | 437 | lc->log_dev_flush_failed = 0; |
b7cca195 AK |
438 | lc->header_location.bdev = lc->log_dev->bdev; |
439 | lc->header_location.sector = 0; | |
440 | ||
441 | /* | |
442 | * Buffer holds both header and bitset. | |
443 | */ | |
18d8594d MS |
444 | buf_size = |
445 | dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, | |
446 | bdev_logical_block_size(lc->header_location. | |
447 | bdev)); | |
ac1f0ac2 | 448 | |
5657e8fa | 449 | if (buf_size > i_size_read(dev->bdev->bd_inode)) { |
ac1f0ac2 MB |
450 | DMWARN("log device %s too small: need %llu bytes", |
451 | dev->name, (unsigned long long)buf_size); | |
452 | kfree(lc); | |
453 | return -EINVAL; | |
454 | } | |
455 | ||
b7cca195 | 456 | lc->header_location.count = buf_size >> SECTOR_SHIFT; |
6f3af01c | 457 | |
5d234d1e | 458 | lc->io_req.mem.type = DM_IO_VMA; |
6f3af01c | 459 | lc->io_req.notify.fn = NULL; |
bda8efec | 460 | lc->io_req.client = dm_io_client_create(); |
5d234d1e HM |
461 | if (IS_ERR(lc->io_req.client)) { |
462 | r = PTR_ERR(lc->io_req.client); | |
463 | DMWARN("couldn't allocate disk io client"); | |
464 | kfree(lc); | |
dbc883f1 | 465 | return r; |
5d234d1e | 466 | } |
b7cca195 AK |
467 | |
468 | lc->disk_header = vmalloc(buf_size); | |
469 | if (!lc->disk_header) { | |
470 | DMWARN("couldn't allocate disk log buffer"); | |
c7a2bd19 | 471 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 AK |
472 | kfree(lc); |
473 | return -ENOMEM; | |
474 | } | |
475 | ||
6f3af01c | 476 | lc->io_req.mem.ptr.vma = lc->disk_header; |
b7cca195 AK |
477 | lc->clean_bits = (void *)lc->disk_header + |
478 | (LOG_OFFSET << SECTOR_SHIFT); | |
1da177e4 | 479 | } |
b7cca195 | 480 | |
1da177e4 LT |
481 | memset(lc->clean_bits, -1, bitset_size); |
482 | ||
483 | lc->sync_bits = vmalloc(bitset_size); | |
484 | if (!lc->sync_bits) { | |
485 | DMWARN("couldn't allocate sync bitset"); | |
b7cca195 AK |
486 | if (!dev) |
487 | vfree(lc->clean_bits); | |
c7a2bd19 TY |
488 | else |
489 | dm_io_client_destroy(lc->io_req.client); | |
b7cca195 | 490 | vfree(lc->disk_header); |
1da177e4 LT |
491 | kfree(lc); |
492 | return -ENOMEM; | |
493 | } | |
494 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); | |
495 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; | |
496 | ||
e29e65aa | 497 | lc->recovering_bits = vzalloc(bitset_size); |
1da177e4 LT |
498 | if (!lc->recovering_bits) { |
499 | DMWARN("couldn't allocate sync bitset"); | |
500 | vfree(lc->sync_bits); | |
b7cca195 AK |
501 | if (!dev) |
502 | vfree(lc->clean_bits); | |
c7a2bd19 TY |
503 | else |
504 | dm_io_client_destroy(lc->io_req.client); | |
b7cca195 | 505 | vfree(lc->disk_header); |
1da177e4 LT |
506 | kfree(lc); |
507 | return -ENOMEM; | |
508 | } | |
1da177e4 LT |
509 | lc->sync_search = 0; |
510 | log->context = lc; | |
b7cca195 | 511 | |
1da177e4 LT |
512 | return 0; |
513 | } | |
514 | ||
416cd17b | 515 | static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
516 | unsigned int argc, char **argv) |
517 | { | |
518 | return create_log_context(log, ti, argc, argv, NULL); | |
519 | } | |
520 | ||
521 | static void destroy_log_context(struct log_c *lc) | |
1da177e4 | 522 | { |
1da177e4 LT |
523 | vfree(lc->sync_bits); |
524 | vfree(lc->recovering_bits); | |
525 | kfree(lc); | |
526 | } | |
527 | ||
416cd17b | 528 | static void core_dtr(struct dm_dirty_log *log) |
b7cca195 AK |
529 | { |
530 | struct log_c *lc = (struct log_c *) log->context; | |
531 | ||
532 | vfree(lc->clean_bits); | |
533 | destroy_log_context(lc); | |
534 | } | |
535 | ||
1da177e4 LT |
536 | /*---------------------------------------------------------------- |
537 | * disk log constructor/destructor | |
538 | * | |
539 | * argv contains log_device region_size followed optionally by [no]sync | |
540 | *--------------------------------------------------------------*/ | |
416cd17b | 541 | static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
1da177e4 LT |
542 | unsigned int argc, char **argv) |
543 | { | |
544 | int r; | |
1da177e4 LT |
545 | struct dm_dev *dev; |
546 | ||
547 | if (argc < 2 || argc > 3) { | |
b7fd54a7 | 548 | DMWARN("wrong number of arguments to disk dirty region log"); |
1da177e4 LT |
549 | return -EINVAL; |
550 | } | |
551 | ||
024d37e9 | 552 | r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); |
1da177e4 LT |
553 | if (r) |
554 | return r; | |
555 | ||
b7cca195 | 556 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
1da177e4 LT |
557 | if (r) { |
558 | dm_put_device(ti, dev); | |
559 | return r; | |
560 | } | |
561 | ||
1da177e4 | 562 | return 0; |
1da177e4 LT |
563 | } |
564 | ||
416cd17b | 565 | static void disk_dtr(struct dm_dirty_log *log) |
1da177e4 LT |
566 | { |
567 | struct log_c *lc = (struct log_c *) log->context; | |
b7cca195 | 568 | |
1da177e4 LT |
569 | dm_put_device(lc->ti, lc->log_dev); |
570 | vfree(lc->disk_header); | |
5d234d1e | 571 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 | 572 | destroy_log_context(lc); |
1da177e4 LT |
573 | } |
574 | ||
01d03a66 JB |
575 | static void fail_log_device(struct log_c *lc) |
576 | { | |
577 | if (lc->log_dev_failed) | |
578 | return; | |
579 | ||
580 | lc->log_dev_failed = 1; | |
581 | dm_table_event(lc->ti->table); | |
582 | } | |
583 | ||
416cd17b | 584 | static int disk_resume(struct dm_dirty_log *log) |
1da177e4 LT |
585 | { |
586 | int r; | |
587 | unsigned i; | |
588 | struct log_c *lc = (struct log_c *) log->context; | |
589 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); | |
590 | ||
591 | /* read the disk header */ | |
592 | r = read_header(lc); | |
01d03a66 | 593 | if (r) { |
b7fd54a7 | 594 | DMWARN("%s: Failed to read header on dirty region log device", |
01d03a66 JB |
595 | lc->log_dev->name); |
596 | fail_log_device(lc); | |
ba8b45ce JB |
597 | /* |
598 | * If the log device cannot be read, we must assume | |
599 | * all regions are out-of-sync. If we simply return | |
600 | * here, the state will be uninitialized and could | |
601 | * lead us to return 'in-sync' status for regions | |
602 | * that are actually 'out-of-sync'. | |
603 | */ | |
604 | lc->header.nr_regions = 0; | |
01d03a66 | 605 | } |
1da177e4 | 606 | |
8a835f11 | 607 | /* set or clear any new bits -- device has grown */ |
1da177e4 LT |
608 | if (lc->sync == NOSYNC) |
609 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
610 | /* FIXME: amazingly inefficient */ | |
611 | log_set_bit(lc, lc->clean_bits, i); | |
612 | else | |
613 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
614 | /* FIXME: amazingly inefficient */ | |
615 | log_clear_bit(lc, lc->clean_bits, i); | |
616 | ||
8a835f11 AK |
617 | /* clear any old bits -- device has shrunk */ |
618 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) | |
619 | log_clear_bit(lc, lc->clean_bits, i); | |
620 | ||
1da177e4 LT |
621 | /* copy clean across to sync */ |
622 | memcpy(lc->sync_bits, lc->clean_bits, size); | |
8fb980e3 AM |
623 | lc->sync_count = memweight(lc->clean_bits, |
624 | lc->bitset_uint32_count * sizeof(uint32_t)); | |
88b20a1a | 625 | lc->sync_search = 0; |
1da177e4 | 626 | |
1da177e4 LT |
627 | /* set the correct number of regions in the header */ |
628 | lc->header.nr_regions = lc->region_count; | |
629 | ||
6f3af01c TY |
630 | header_to_disk(&lc->header, lc->disk_header); |
631 | ||
1da177e4 | 632 | /* write the new header */ |
6f3af01c | 633 | r = rw_header(lc, WRITE); |
64b30c46 | 634 | if (!r) { |
20a34a8e | 635 | r = flush_header(lc); |
64b30c46 MP |
636 | if (r) |
637 | lc->log_dev_flush_failed = 1; | |
638 | } | |
01d03a66 | 639 | if (r) { |
b7fd54a7 | 640 | DMWARN("%s: Failed to write header on dirty region log device", |
01d03a66 JB |
641 | lc->log_dev->name); |
642 | fail_log_device(lc); | |
643 | } | |
644 | ||
645 | return r; | |
1da177e4 LT |
646 | } |
647 | ||
416cd17b | 648 | static uint32_t core_get_region_size(struct dm_dirty_log *log) |
1da177e4 LT |
649 | { |
650 | struct log_c *lc = (struct log_c *) log->context; | |
651 | return lc->region_size; | |
652 | } | |
653 | ||
416cd17b | 654 | static int core_resume(struct dm_dirty_log *log) |
88b20a1a JB |
655 | { |
656 | struct log_c *lc = (struct log_c *) log->context; | |
657 | lc->sync_search = 0; | |
658 | return 0; | |
659 | } | |
660 | ||
416cd17b | 661 | static int core_is_clean(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
662 | { |
663 | struct log_c *lc = (struct log_c *) log->context; | |
664 | return log_test_bit(lc->clean_bits, region); | |
665 | } | |
666 | ||
416cd17b | 667 | static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) |
1da177e4 LT |
668 | { |
669 | struct log_c *lc = (struct log_c *) log->context; | |
670 | return log_test_bit(lc->sync_bits, region); | |
671 | } | |
672 | ||
416cd17b | 673 | static int core_flush(struct dm_dirty_log *log) |
1da177e4 LT |
674 | { |
675 | /* no op */ | |
676 | return 0; | |
677 | } | |
678 | ||
416cd17b | 679 | static int disk_flush(struct dm_dirty_log *log) |
1da177e4 | 680 | { |
076010e2 MP |
681 | int r, i; |
682 | struct log_c *lc = log->context; | |
1da177e4 LT |
683 | |
684 | /* only write if the log has changed */ | |
b09acf1a | 685 | if (!lc->touched_cleaned && !lc->touched_dirtied) |
1da177e4 LT |
686 | return 0; |
687 | ||
076010e2 MP |
688 | if (lc->touched_cleaned && log->flush_callback_fn && |
689 | log->flush_callback_fn(lc->ti)) { | |
690 | /* | |
691 | * At this point it is impossible to determine which | |
692 | * regions are clean and which are dirty (without | |
693 | * re-reading the log off disk). So mark all of them | |
694 | * dirty. | |
695 | */ | |
696 | lc->flush_failed = 1; | |
697 | for (i = 0; i < lc->region_count; i++) | |
698 | log_clear_bit(lc, lc->clean_bits, i); | |
699 | } | |
700 | ||
6f3af01c | 701 | r = rw_header(lc, WRITE); |
01d03a66 JB |
702 | if (r) |
703 | fail_log_device(lc); | |
b09acf1a | 704 | else { |
20a34a8e MP |
705 | if (lc->touched_dirtied) { |
706 | r = flush_header(lc); | |
64b30c46 MP |
707 | if (r) { |
708 | lc->log_dev_flush_failed = 1; | |
20a34a8e | 709 | fail_log_device(lc); |
64b30c46 | 710 | } else |
20a34a8e MP |
711 | lc->touched_dirtied = 0; |
712 | } | |
b09acf1a MP |
713 | lc->touched_cleaned = 0; |
714 | } | |
1da177e4 LT |
715 | |
716 | return r; | |
717 | } | |
718 | ||
416cd17b | 719 | static void core_mark_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
720 | { |
721 | struct log_c *lc = (struct log_c *) log->context; | |
722 | log_clear_bit(lc, lc->clean_bits, region); | |
723 | } | |
724 | ||
416cd17b | 725 | static void core_clear_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
726 | { |
727 | struct log_c *lc = (struct log_c *) log->context; | |
5adc78d0 MP |
728 | if (likely(!lc->flush_failed)) |
729 | log_set_bit(lc, lc->clean_bits, region); | |
1da177e4 LT |
730 | } |
731 | ||
416cd17b | 732 | static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) |
1da177e4 LT |
733 | { |
734 | struct log_c *lc = (struct log_c *) log->context; | |
735 | ||
736 | if (lc->sync_search >= lc->region_count) | |
737 | return 0; | |
738 | ||
739 | do { | |
c8f543e0 | 740 | *region = find_next_zero_bit_le(lc->sync_bits, |
1da177e4 LT |
741 | lc->region_count, |
742 | lc->sync_search); | |
743 | lc->sync_search = *region + 1; | |
744 | ||
ac81b2ee | 745 | if (*region >= lc->region_count) |
1da177e4 LT |
746 | return 0; |
747 | ||
748 | } while (log_test_bit(lc->recovering_bits, *region)); | |
749 | ||
750 | log_set_bit(lc, lc->recovering_bits, *region); | |
751 | return 1; | |
752 | } | |
753 | ||
416cd17b | 754 | static void core_set_region_sync(struct dm_dirty_log *log, region_t region, |
f3ee6b2f | 755 | int in_sync) |
1da177e4 LT |
756 | { |
757 | struct log_c *lc = (struct log_c *) log->context; | |
758 | ||
759 | log_clear_bit(lc, lc->recovering_bits, region); | |
f3ee6b2f | 760 | if (in_sync) { |
1da177e4 LT |
761 | log_set_bit(lc, lc->sync_bits, region); |
762 | lc->sync_count++; | |
f3ee6b2f JB |
763 | } else if (log_test_bit(lc->sync_bits, region)) { |
764 | lc->sync_count--; | |
765 | log_clear_bit(lc, lc->sync_bits, region); | |
766 | } | |
1da177e4 LT |
767 | } |
768 | ||
416cd17b | 769 | static region_t core_get_sync_count(struct dm_dirty_log *log) |
1da177e4 LT |
770 | { |
771 | struct log_c *lc = (struct log_c *) log->context; | |
772 | ||
773 | return lc->sync_count; | |
774 | } | |
775 | ||
776 | #define DMEMIT_SYNC \ | |
777 | if (lc->sync != DEFAULTSYNC) \ | |
778 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") | |
779 | ||
416cd17b | 780 | static int core_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
781 | char *result, unsigned int maxlen) |
782 | { | |
783 | int sz = 0; | |
784 | struct log_c *lc = log->context; | |
785 | ||
786 | switch(status) { | |
787 | case STATUSTYPE_INFO: | |
315dcc22 | 788 | DMEMIT("1 %s", log->type->name); |
1da177e4 LT |
789 | break; |
790 | ||
791 | case STATUSTYPE_TABLE: | |
792 | DMEMIT("%s %u %u ", log->type->name, | |
793 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); | |
794 | DMEMIT_SYNC; | |
795 | } | |
796 | ||
797 | return sz; | |
798 | } | |
799 | ||
416cd17b | 800 | static int disk_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
801 | char *result, unsigned int maxlen) |
802 | { | |
803 | int sz = 0; | |
1da177e4 LT |
804 | struct log_c *lc = log->context; |
805 | ||
806 | switch(status) { | |
807 | case STATUSTYPE_INFO: | |
315dcc22 | 808 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
64b30c46 MP |
809 | lc->log_dev_flush_failed ? 'F' : |
810 | lc->log_dev_failed ? 'D' : | |
811 | 'A'); | |
1da177e4 LT |
812 | break; |
813 | ||
814 | case STATUSTYPE_TABLE: | |
1da177e4 | 815 | DMEMIT("%s %u %s %u ", log->type->name, |
315dcc22 | 816 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
1da177e4 LT |
817 | lc->region_size); |
818 | DMEMIT_SYNC; | |
819 | } | |
820 | ||
821 | return sz; | |
822 | } | |
823 | ||
416cd17b | 824 | static struct dm_dirty_log_type _core_type = { |
1da177e4 LT |
825 | .name = "core", |
826 | .module = THIS_MODULE, | |
827 | .ctr = core_ctr, | |
828 | .dtr = core_dtr, | |
88b20a1a | 829 | .resume = core_resume, |
1da177e4 LT |
830 | .get_region_size = core_get_region_size, |
831 | .is_clean = core_is_clean, | |
832 | .in_sync = core_in_sync, | |
833 | .flush = core_flush, | |
834 | .mark_region = core_mark_region, | |
835 | .clear_region = core_clear_region, | |
836 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 837 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
838 | .get_sync_count = core_get_sync_count, |
839 | .status = core_status, | |
840 | }; | |
841 | ||
416cd17b | 842 | static struct dm_dirty_log_type _disk_type = { |
1da177e4 LT |
843 | .name = "disk", |
844 | .module = THIS_MODULE, | |
845 | .ctr = disk_ctr, | |
846 | .dtr = disk_dtr, | |
6b3df0d7 | 847 | .postsuspend = disk_flush, |
1da177e4 LT |
848 | .resume = disk_resume, |
849 | .get_region_size = core_get_region_size, | |
850 | .is_clean = core_is_clean, | |
851 | .in_sync = core_in_sync, | |
852 | .flush = disk_flush, | |
853 | .mark_region = core_mark_region, | |
854 | .clear_region = core_clear_region, | |
855 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 856 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
857 | .get_sync_count = core_get_sync_count, |
858 | .status = disk_status, | |
859 | }; | |
860 | ||
c8da2f8d | 861 | static int __init dm_dirty_log_init(void) |
1da177e4 LT |
862 | { |
863 | int r; | |
864 | ||
416cd17b | 865 | r = dm_dirty_log_type_register(&_core_type); |
1da177e4 LT |
866 | if (r) |
867 | DMWARN("couldn't register core log"); | |
868 | ||
416cd17b | 869 | r = dm_dirty_log_type_register(&_disk_type); |
1da177e4 LT |
870 | if (r) { |
871 | DMWARN("couldn't register disk type"); | |
416cd17b | 872 | dm_dirty_log_type_unregister(&_core_type); |
1da177e4 LT |
873 | } |
874 | ||
875 | return r; | |
876 | } | |
877 | ||
c8da2f8d | 878 | static void __exit dm_dirty_log_exit(void) |
1da177e4 | 879 | { |
416cd17b HM |
880 | dm_dirty_log_type_unregister(&_disk_type); |
881 | dm_dirty_log_type_unregister(&_core_type); | |
1da177e4 LT |
882 | } |
883 | ||
769aef30 HM |
884 | module_init(dm_dirty_log_init); |
885 | module_exit(dm_dirty_log_exit); | |
886 | ||
887 | MODULE_DESCRIPTION(DM_NAME " dirty region log"); | |
888 | MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <[email protected]>"); | |
889 | MODULE_LICENSE("GPL"); |