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 | ||
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 | { | |
296 | lc->io_req.bi_rw = 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 | ||
d87f4c14 | 309 | lc->io_req.bi_rw = WRITE_FLUSH; |
20a34a8e MP |
310 | |
311 | return dm_io(&lc->io_req, 1, &null_location, NULL); | |
312 | } | |
313 | ||
1da177e4 LT |
314 | static int read_header(struct log_c *log) |
315 | { | |
316 | int r; | |
1da177e4 | 317 | |
5d234d1e | 318 | r = rw_header(log, READ); |
1da177e4 LT |
319 | if (r) |
320 | return r; | |
321 | ||
322 | header_from_disk(&log->header, log->disk_header); | |
323 | ||
324 | /* New log required? */ | |
325 | if (log->sync != DEFAULTSYNC || log->header.magic != MIRROR_MAGIC) { | |
326 | log->header.magic = MIRROR_MAGIC; | |
327 | log->header.version = MIRROR_DISK_VERSION; | |
328 | log->header.nr_regions = 0; | |
329 | } | |
330 | ||
a4fc4717 PC |
331 | #ifdef __LITTLE_ENDIAN |
332 | if (log->header.version == 1) | |
333 | log->header.version = 2; | |
334 | #endif | |
335 | ||
1da177e4 LT |
336 | if (log->header.version != MIRROR_DISK_VERSION) { |
337 | DMWARN("incompatible disk log version"); | |
338 | return -EINVAL; | |
339 | } | |
340 | ||
341 | return 0; | |
342 | } | |
343 | ||
2045e88e MB |
344 | static int _check_region_size(struct dm_target *ti, uint32_t region_size) |
345 | { | |
346 | if (region_size < 2 || region_size > ti->len) | |
347 | return 0; | |
348 | ||
349 | if (!is_power_of_2(region_size)) | |
350 | return 0; | |
351 | ||
352 | return 1; | |
353 | } | |
354 | ||
1da177e4 LT |
355 | /*---------------------------------------------------------------- |
356 | * core log constructor/destructor | |
357 | * | |
358 | * argv contains region_size followed optionally by [no]sync | |
359 | *--------------------------------------------------------------*/ | |
360 | #define BYTE_SHIFT 3 | |
416cd17b | 361 | static int create_log_context(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
362 | unsigned int argc, char **argv, |
363 | struct dm_dev *dev) | |
1da177e4 LT |
364 | { |
365 | enum sync sync = DEFAULTSYNC; | |
366 | ||
367 | struct log_c *lc; | |
368 | uint32_t region_size; | |
369 | unsigned int region_count; | |
b7cca195 | 370 | size_t bitset_size, buf_size; |
5d234d1e | 371 | int r; |
1da177e4 LT |
372 | |
373 | if (argc < 1 || argc > 2) { | |
b7fd54a7 | 374 | DMWARN("wrong number of arguments to dirty region log"); |
1da177e4 LT |
375 | return -EINVAL; |
376 | } | |
377 | ||
378 | if (argc > 1) { | |
379 | if (!strcmp(argv[1], "sync")) | |
380 | sync = FORCESYNC; | |
381 | else if (!strcmp(argv[1], "nosync")) | |
382 | sync = NOSYNC; | |
383 | else { | |
b7fd54a7 HM |
384 | DMWARN("unrecognised sync argument to " |
385 | "dirty region log: %s", argv[1]); | |
1da177e4 LT |
386 | return -EINVAL; |
387 | } | |
388 | } | |
389 | ||
2045e88e MB |
390 | if (sscanf(argv[0], "%u", ®ion_size) != 1 || |
391 | !_check_region_size(ti, region_size)) { | |
392 | DMWARN("invalid region size %s", argv[0]); | |
1da177e4 LT |
393 | return -EINVAL; |
394 | } | |
395 | ||
396 | region_count = dm_sector_div_up(ti->len, region_size); | |
397 | ||
398 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
399 | if (!lc) { | |
400 | DMWARN("couldn't allocate core log"); | |
401 | return -ENOMEM; | |
402 | } | |
403 | ||
404 | lc->ti = ti; | |
b09acf1a MP |
405 | lc->touched_dirtied = 0; |
406 | lc->touched_cleaned = 0; | |
5adc78d0 | 407 | lc->flush_failed = 0; |
1da177e4 LT |
408 | lc->region_size = region_size; |
409 | lc->region_count = region_count; | |
410 | lc->sync = sync; | |
411 | ||
412 | /* | |
0e56822d | 413 | * Work out how many "unsigned long"s we need to hold the bitset. |
1da177e4 LT |
414 | */ |
415 | bitset_size = dm_round_up(region_count, | |
29121bd0 | 416 | sizeof(*lc->clean_bits) << BYTE_SHIFT); |
1da177e4 LT |
417 | bitset_size >>= BYTE_SHIFT; |
418 | ||
29121bd0 | 419 | lc->bitset_uint32_count = bitset_size / sizeof(*lc->clean_bits); |
b7cca195 AK |
420 | |
421 | /* | |
422 | * Disk log? | |
423 | */ | |
424 | if (!dev) { | |
425 | lc->clean_bits = vmalloc(bitset_size); | |
426 | if (!lc->clean_bits) { | |
427 | DMWARN("couldn't allocate clean bitset"); | |
428 | kfree(lc); | |
429 | return -ENOMEM; | |
430 | } | |
431 | lc->disk_header = NULL; | |
432 | } else { | |
433 | lc->log_dev = dev; | |
01d03a66 | 434 | lc->log_dev_failed = 0; |
64b30c46 | 435 | lc->log_dev_flush_failed = 0; |
b7cca195 AK |
436 | lc->header_location.bdev = lc->log_dev->bdev; |
437 | lc->header_location.sector = 0; | |
438 | ||
439 | /* | |
440 | * Buffer holds both header and bitset. | |
441 | */ | |
18d8594d MS |
442 | buf_size = |
443 | dm_round_up((LOG_OFFSET << SECTOR_SHIFT) + bitset_size, | |
444 | bdev_logical_block_size(lc->header_location. | |
445 | bdev)); | |
ac1f0ac2 | 446 | |
5657e8fa | 447 | if (buf_size > i_size_read(dev->bdev->bd_inode)) { |
ac1f0ac2 MB |
448 | DMWARN("log device %s too small: need %llu bytes", |
449 | dev->name, (unsigned long long)buf_size); | |
450 | kfree(lc); | |
451 | return -EINVAL; | |
452 | } | |
453 | ||
b7cca195 | 454 | lc->header_location.count = buf_size >> SECTOR_SHIFT; |
6f3af01c | 455 | |
5d234d1e | 456 | lc->io_req.mem.type = DM_IO_VMA; |
6f3af01c | 457 | lc->io_req.notify.fn = NULL; |
bda8efec | 458 | lc->io_req.client = dm_io_client_create(); |
5d234d1e HM |
459 | if (IS_ERR(lc->io_req.client)) { |
460 | r = PTR_ERR(lc->io_req.client); | |
461 | DMWARN("couldn't allocate disk io client"); | |
462 | kfree(lc); | |
dbc883f1 | 463 | return r; |
5d234d1e | 464 | } |
b7cca195 AK |
465 | |
466 | lc->disk_header = vmalloc(buf_size); | |
467 | if (!lc->disk_header) { | |
468 | DMWARN("couldn't allocate disk log buffer"); | |
c7a2bd19 | 469 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 AK |
470 | kfree(lc); |
471 | return -ENOMEM; | |
472 | } | |
473 | ||
6f3af01c | 474 | lc->io_req.mem.ptr.vma = lc->disk_header; |
b7cca195 AK |
475 | lc->clean_bits = (void *)lc->disk_header + |
476 | (LOG_OFFSET << SECTOR_SHIFT); | |
1da177e4 | 477 | } |
b7cca195 | 478 | |
1da177e4 LT |
479 | memset(lc->clean_bits, -1, bitset_size); |
480 | ||
481 | lc->sync_bits = vmalloc(bitset_size); | |
482 | if (!lc->sync_bits) { | |
483 | DMWARN("couldn't allocate sync bitset"); | |
b7cca195 AK |
484 | if (!dev) |
485 | vfree(lc->clean_bits); | |
c7a2bd19 TY |
486 | else |
487 | dm_io_client_destroy(lc->io_req.client); | |
b7cca195 | 488 | vfree(lc->disk_header); |
1da177e4 LT |
489 | kfree(lc); |
490 | return -ENOMEM; | |
491 | } | |
492 | memset(lc->sync_bits, (sync == NOSYNC) ? -1 : 0, bitset_size); | |
493 | lc->sync_count = (sync == NOSYNC) ? region_count : 0; | |
494 | ||
e29e65aa | 495 | lc->recovering_bits = vzalloc(bitset_size); |
1da177e4 LT |
496 | if (!lc->recovering_bits) { |
497 | DMWARN("couldn't allocate sync bitset"); | |
498 | vfree(lc->sync_bits); | |
b7cca195 AK |
499 | if (!dev) |
500 | vfree(lc->clean_bits); | |
c7a2bd19 TY |
501 | else |
502 | dm_io_client_destroy(lc->io_req.client); | |
b7cca195 | 503 | vfree(lc->disk_header); |
1da177e4 LT |
504 | kfree(lc); |
505 | return -ENOMEM; | |
506 | } | |
1da177e4 LT |
507 | lc->sync_search = 0; |
508 | log->context = lc; | |
b7cca195 | 509 | |
1da177e4 LT |
510 | return 0; |
511 | } | |
512 | ||
416cd17b | 513 | static int core_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
b7cca195 AK |
514 | unsigned int argc, char **argv) |
515 | { | |
516 | return create_log_context(log, ti, argc, argv, NULL); | |
517 | } | |
518 | ||
519 | static void destroy_log_context(struct log_c *lc) | |
1da177e4 | 520 | { |
1da177e4 LT |
521 | vfree(lc->sync_bits); |
522 | vfree(lc->recovering_bits); | |
523 | kfree(lc); | |
524 | } | |
525 | ||
416cd17b | 526 | static void core_dtr(struct dm_dirty_log *log) |
b7cca195 AK |
527 | { |
528 | struct log_c *lc = (struct log_c *) log->context; | |
529 | ||
530 | vfree(lc->clean_bits); | |
531 | destroy_log_context(lc); | |
532 | } | |
533 | ||
1da177e4 LT |
534 | /*---------------------------------------------------------------- |
535 | * disk log constructor/destructor | |
536 | * | |
537 | * argv contains log_device region_size followed optionally by [no]sync | |
538 | *--------------------------------------------------------------*/ | |
416cd17b | 539 | static int disk_ctr(struct dm_dirty_log *log, struct dm_target *ti, |
1da177e4 LT |
540 | unsigned int argc, char **argv) |
541 | { | |
542 | int r; | |
1da177e4 LT |
543 | struct dm_dev *dev; |
544 | ||
545 | if (argc < 2 || argc > 3) { | |
b7fd54a7 | 546 | DMWARN("wrong number of arguments to disk dirty region log"); |
1da177e4 LT |
547 | return -EINVAL; |
548 | } | |
549 | ||
024d37e9 | 550 | r = dm_get_device(ti, argv[0], dm_table_get_mode(ti->table), &dev); |
1da177e4 LT |
551 | if (r) |
552 | return r; | |
553 | ||
b7cca195 | 554 | r = create_log_context(log, ti, argc - 1, argv + 1, dev); |
1da177e4 LT |
555 | if (r) { |
556 | dm_put_device(ti, dev); | |
557 | return r; | |
558 | } | |
559 | ||
1da177e4 | 560 | return 0; |
1da177e4 LT |
561 | } |
562 | ||
416cd17b | 563 | static void disk_dtr(struct dm_dirty_log *log) |
1da177e4 LT |
564 | { |
565 | struct log_c *lc = (struct log_c *) log->context; | |
b7cca195 | 566 | |
1da177e4 LT |
567 | dm_put_device(lc->ti, lc->log_dev); |
568 | vfree(lc->disk_header); | |
5d234d1e | 569 | dm_io_client_destroy(lc->io_req.client); |
b7cca195 | 570 | destroy_log_context(lc); |
1da177e4 LT |
571 | } |
572 | ||
573 | static int count_bits32(uint32_t *addr, unsigned size) | |
574 | { | |
575 | int count = 0, i; | |
576 | ||
577 | for (i = 0; i < size; i++) { | |
578 | count += hweight32(*(addr+i)); | |
579 | } | |
580 | return count; | |
581 | } | |
582 | ||
01d03a66 JB |
583 | static void fail_log_device(struct log_c *lc) |
584 | { | |
585 | if (lc->log_dev_failed) | |
586 | return; | |
587 | ||
588 | lc->log_dev_failed = 1; | |
589 | dm_table_event(lc->ti->table); | |
590 | } | |
591 | ||
416cd17b | 592 | static int disk_resume(struct dm_dirty_log *log) |
1da177e4 LT |
593 | { |
594 | int r; | |
595 | unsigned i; | |
596 | struct log_c *lc = (struct log_c *) log->context; | |
597 | size_t size = lc->bitset_uint32_count * sizeof(uint32_t); | |
598 | ||
599 | /* read the disk header */ | |
600 | r = read_header(lc); | |
01d03a66 | 601 | if (r) { |
b7fd54a7 | 602 | DMWARN("%s: Failed to read header on dirty region log device", |
01d03a66 JB |
603 | lc->log_dev->name); |
604 | fail_log_device(lc); | |
ba8b45ce JB |
605 | /* |
606 | * If the log device cannot be read, we must assume | |
607 | * all regions are out-of-sync. If we simply return | |
608 | * here, the state will be uninitialized and could | |
609 | * lead us to return 'in-sync' status for regions | |
610 | * that are actually 'out-of-sync'. | |
611 | */ | |
612 | lc->header.nr_regions = 0; | |
01d03a66 | 613 | } |
1da177e4 | 614 | |
8a835f11 | 615 | /* set or clear any new bits -- device has grown */ |
1da177e4 LT |
616 | if (lc->sync == NOSYNC) |
617 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
618 | /* FIXME: amazingly inefficient */ | |
619 | log_set_bit(lc, lc->clean_bits, i); | |
620 | else | |
621 | for (i = lc->header.nr_regions; i < lc->region_count; i++) | |
622 | /* FIXME: amazingly inefficient */ | |
623 | log_clear_bit(lc, lc->clean_bits, i); | |
624 | ||
8a835f11 AK |
625 | /* clear any old bits -- device has shrunk */ |
626 | for (i = lc->region_count; i % (sizeof(*lc->clean_bits) << BYTE_SHIFT); i++) | |
627 | log_clear_bit(lc, lc->clean_bits, i); | |
628 | ||
1da177e4 LT |
629 | /* copy clean across to sync */ |
630 | memcpy(lc->sync_bits, lc->clean_bits, size); | |
631 | lc->sync_count = count_bits32(lc->clean_bits, lc->bitset_uint32_count); | |
88b20a1a | 632 | lc->sync_search = 0; |
1da177e4 | 633 | |
1da177e4 LT |
634 | /* set the correct number of regions in the header */ |
635 | lc->header.nr_regions = lc->region_count; | |
636 | ||
6f3af01c TY |
637 | header_to_disk(&lc->header, lc->disk_header); |
638 | ||
1da177e4 | 639 | /* write the new header */ |
6f3af01c | 640 | r = rw_header(lc, WRITE); |
64b30c46 | 641 | if (!r) { |
20a34a8e | 642 | r = flush_header(lc); |
64b30c46 MP |
643 | if (r) |
644 | lc->log_dev_flush_failed = 1; | |
645 | } | |
01d03a66 | 646 | if (r) { |
b7fd54a7 | 647 | DMWARN("%s: Failed to write header on dirty region log device", |
01d03a66 JB |
648 | lc->log_dev->name); |
649 | fail_log_device(lc); | |
650 | } | |
651 | ||
652 | return r; | |
1da177e4 LT |
653 | } |
654 | ||
416cd17b | 655 | static uint32_t core_get_region_size(struct dm_dirty_log *log) |
1da177e4 LT |
656 | { |
657 | struct log_c *lc = (struct log_c *) log->context; | |
658 | return lc->region_size; | |
659 | } | |
660 | ||
416cd17b | 661 | static int core_resume(struct dm_dirty_log *log) |
88b20a1a JB |
662 | { |
663 | struct log_c *lc = (struct log_c *) log->context; | |
664 | lc->sync_search = 0; | |
665 | return 0; | |
666 | } | |
667 | ||
416cd17b | 668 | static int core_is_clean(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
669 | { |
670 | struct log_c *lc = (struct log_c *) log->context; | |
671 | return log_test_bit(lc->clean_bits, region); | |
672 | } | |
673 | ||
416cd17b | 674 | static int core_in_sync(struct dm_dirty_log *log, region_t region, int block) |
1da177e4 LT |
675 | { |
676 | struct log_c *lc = (struct log_c *) log->context; | |
677 | return log_test_bit(lc->sync_bits, region); | |
678 | } | |
679 | ||
416cd17b | 680 | static int core_flush(struct dm_dirty_log *log) |
1da177e4 LT |
681 | { |
682 | /* no op */ | |
683 | return 0; | |
684 | } | |
685 | ||
416cd17b | 686 | static int disk_flush(struct dm_dirty_log *log) |
1da177e4 | 687 | { |
076010e2 MP |
688 | int r, i; |
689 | struct log_c *lc = log->context; | |
1da177e4 LT |
690 | |
691 | /* only write if the log has changed */ | |
b09acf1a | 692 | if (!lc->touched_cleaned && !lc->touched_dirtied) |
1da177e4 LT |
693 | return 0; |
694 | ||
076010e2 MP |
695 | if (lc->touched_cleaned && log->flush_callback_fn && |
696 | log->flush_callback_fn(lc->ti)) { | |
697 | /* | |
698 | * At this point it is impossible to determine which | |
699 | * regions are clean and which are dirty (without | |
700 | * re-reading the log off disk). So mark all of them | |
701 | * dirty. | |
702 | */ | |
703 | lc->flush_failed = 1; | |
704 | for (i = 0; i < lc->region_count; i++) | |
705 | log_clear_bit(lc, lc->clean_bits, i); | |
706 | } | |
707 | ||
6f3af01c | 708 | r = rw_header(lc, WRITE); |
01d03a66 JB |
709 | if (r) |
710 | fail_log_device(lc); | |
b09acf1a | 711 | else { |
20a34a8e MP |
712 | if (lc->touched_dirtied) { |
713 | r = flush_header(lc); | |
64b30c46 MP |
714 | if (r) { |
715 | lc->log_dev_flush_failed = 1; | |
20a34a8e | 716 | fail_log_device(lc); |
64b30c46 | 717 | } else |
20a34a8e MP |
718 | lc->touched_dirtied = 0; |
719 | } | |
b09acf1a MP |
720 | lc->touched_cleaned = 0; |
721 | } | |
1da177e4 LT |
722 | |
723 | return r; | |
724 | } | |
725 | ||
416cd17b | 726 | static void core_mark_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
727 | { |
728 | struct log_c *lc = (struct log_c *) log->context; | |
729 | log_clear_bit(lc, lc->clean_bits, region); | |
730 | } | |
731 | ||
416cd17b | 732 | static void core_clear_region(struct dm_dirty_log *log, region_t region) |
1da177e4 LT |
733 | { |
734 | struct log_c *lc = (struct log_c *) log->context; | |
5adc78d0 MP |
735 | if (likely(!lc->flush_failed)) |
736 | log_set_bit(lc, lc->clean_bits, region); | |
1da177e4 LT |
737 | } |
738 | ||
416cd17b | 739 | static int core_get_resync_work(struct dm_dirty_log *log, region_t *region) |
1da177e4 LT |
740 | { |
741 | struct log_c *lc = (struct log_c *) log->context; | |
742 | ||
743 | if (lc->sync_search >= lc->region_count) | |
744 | return 0; | |
745 | ||
746 | do { | |
c8f543e0 | 747 | *region = find_next_zero_bit_le(lc->sync_bits, |
1da177e4 LT |
748 | lc->region_count, |
749 | lc->sync_search); | |
750 | lc->sync_search = *region + 1; | |
751 | ||
ac81b2ee | 752 | if (*region >= lc->region_count) |
1da177e4 LT |
753 | return 0; |
754 | ||
755 | } while (log_test_bit(lc->recovering_bits, *region)); | |
756 | ||
757 | log_set_bit(lc, lc->recovering_bits, *region); | |
758 | return 1; | |
759 | } | |
760 | ||
416cd17b | 761 | static void core_set_region_sync(struct dm_dirty_log *log, region_t region, |
f3ee6b2f | 762 | int in_sync) |
1da177e4 LT |
763 | { |
764 | struct log_c *lc = (struct log_c *) log->context; | |
765 | ||
766 | log_clear_bit(lc, lc->recovering_bits, region); | |
f3ee6b2f | 767 | if (in_sync) { |
1da177e4 LT |
768 | log_set_bit(lc, lc->sync_bits, region); |
769 | lc->sync_count++; | |
f3ee6b2f JB |
770 | } else if (log_test_bit(lc->sync_bits, region)) { |
771 | lc->sync_count--; | |
772 | log_clear_bit(lc, lc->sync_bits, region); | |
773 | } | |
1da177e4 LT |
774 | } |
775 | ||
416cd17b | 776 | static region_t core_get_sync_count(struct dm_dirty_log *log) |
1da177e4 LT |
777 | { |
778 | struct log_c *lc = (struct log_c *) log->context; | |
779 | ||
780 | return lc->sync_count; | |
781 | } | |
782 | ||
783 | #define DMEMIT_SYNC \ | |
784 | if (lc->sync != DEFAULTSYNC) \ | |
785 | DMEMIT("%ssync ", lc->sync == NOSYNC ? "no" : "") | |
786 | ||
416cd17b | 787 | static int core_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
788 | char *result, unsigned int maxlen) |
789 | { | |
790 | int sz = 0; | |
791 | struct log_c *lc = log->context; | |
792 | ||
793 | switch(status) { | |
794 | case STATUSTYPE_INFO: | |
315dcc22 | 795 | DMEMIT("1 %s", log->type->name); |
1da177e4 LT |
796 | break; |
797 | ||
798 | case STATUSTYPE_TABLE: | |
799 | DMEMIT("%s %u %u ", log->type->name, | |
800 | lc->sync == DEFAULTSYNC ? 1 : 2, lc->region_size); | |
801 | DMEMIT_SYNC; | |
802 | } | |
803 | ||
804 | return sz; | |
805 | } | |
806 | ||
416cd17b | 807 | static int disk_status(struct dm_dirty_log *log, status_type_t status, |
1da177e4 LT |
808 | char *result, unsigned int maxlen) |
809 | { | |
810 | int sz = 0; | |
1da177e4 LT |
811 | struct log_c *lc = log->context; |
812 | ||
813 | switch(status) { | |
814 | case STATUSTYPE_INFO: | |
315dcc22 | 815 | DMEMIT("3 %s %s %c", log->type->name, lc->log_dev->name, |
64b30c46 MP |
816 | lc->log_dev_flush_failed ? 'F' : |
817 | lc->log_dev_failed ? 'D' : | |
818 | 'A'); | |
1da177e4 LT |
819 | break; |
820 | ||
821 | case STATUSTYPE_TABLE: | |
1da177e4 | 822 | DMEMIT("%s %u %s %u ", log->type->name, |
315dcc22 | 823 | lc->sync == DEFAULTSYNC ? 2 : 3, lc->log_dev->name, |
1da177e4 LT |
824 | lc->region_size); |
825 | DMEMIT_SYNC; | |
826 | } | |
827 | ||
828 | return sz; | |
829 | } | |
830 | ||
416cd17b | 831 | static struct dm_dirty_log_type _core_type = { |
1da177e4 LT |
832 | .name = "core", |
833 | .module = THIS_MODULE, | |
834 | .ctr = core_ctr, | |
835 | .dtr = core_dtr, | |
88b20a1a | 836 | .resume = core_resume, |
1da177e4 LT |
837 | .get_region_size = core_get_region_size, |
838 | .is_clean = core_is_clean, | |
839 | .in_sync = core_in_sync, | |
840 | .flush = core_flush, | |
841 | .mark_region = core_mark_region, | |
842 | .clear_region = core_clear_region, | |
843 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 844 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
845 | .get_sync_count = core_get_sync_count, |
846 | .status = core_status, | |
847 | }; | |
848 | ||
416cd17b | 849 | static struct dm_dirty_log_type _disk_type = { |
1da177e4 LT |
850 | .name = "disk", |
851 | .module = THIS_MODULE, | |
852 | .ctr = disk_ctr, | |
853 | .dtr = disk_dtr, | |
6b3df0d7 | 854 | .postsuspend = disk_flush, |
1da177e4 LT |
855 | .resume = disk_resume, |
856 | .get_region_size = core_get_region_size, | |
857 | .is_clean = core_is_clean, | |
858 | .in_sync = core_in_sync, | |
859 | .flush = disk_flush, | |
860 | .mark_region = core_mark_region, | |
861 | .clear_region = core_clear_region, | |
862 | .get_resync_work = core_get_resync_work, | |
f3ee6b2f | 863 | .set_region_sync = core_set_region_sync, |
1da177e4 LT |
864 | .get_sync_count = core_get_sync_count, |
865 | .status = disk_status, | |
866 | }; | |
867 | ||
c8da2f8d | 868 | static int __init dm_dirty_log_init(void) |
1da177e4 LT |
869 | { |
870 | int r; | |
871 | ||
416cd17b | 872 | r = dm_dirty_log_type_register(&_core_type); |
1da177e4 LT |
873 | if (r) |
874 | DMWARN("couldn't register core log"); | |
875 | ||
416cd17b | 876 | r = dm_dirty_log_type_register(&_disk_type); |
1da177e4 LT |
877 | if (r) { |
878 | DMWARN("couldn't register disk type"); | |
416cd17b | 879 | dm_dirty_log_type_unregister(&_core_type); |
1da177e4 LT |
880 | } |
881 | ||
882 | return r; | |
883 | } | |
884 | ||
c8da2f8d | 885 | static void __exit dm_dirty_log_exit(void) |
1da177e4 | 886 | { |
416cd17b HM |
887 | dm_dirty_log_type_unregister(&_disk_type); |
888 | dm_dirty_log_type_unregister(&_core_type); | |
1da177e4 LT |
889 | } |
890 | ||
769aef30 HM |
891 | module_init(dm_dirty_log_init); |
892 | module_exit(dm_dirty_log_exit); | |
893 | ||
894 | MODULE_DESCRIPTION(DM_NAME " dirty region log"); | |
895 | MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@redhat.com>"); | |
896 | MODULE_LICENSE("GPL"); |