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f5db4af4 JB |
1 | /* |
2 | * Copyright (C) 2006-2009 Red Hat, Inc. | |
3 | * | |
4 | * This file is released under the LGPL. | |
5 | */ | |
6 | ||
7 | #include <linux/bio.h> | |
5a0e3ad6 | 8 | #include <linux/slab.h> |
f5db4af4 JB |
9 | #include <linux/dm-dirty-log.h> |
10 | #include <linux/device-mapper.h> | |
11 | #include <linux/dm-log-userspace.h> | |
12 | ||
13 | #include "dm-log-userspace-transfer.h" | |
14 | ||
15 | struct flush_entry { | |
16 | int type; | |
17 | region_t region; | |
18 | struct list_head list; | |
19 | }; | |
20 | ||
21 | struct log_c { | |
22 | struct dm_target *ti; | |
23 | uint32_t region_size; | |
24 | region_t region_count; | |
7ec23d50 | 25 | uint64_t luid; |
f5db4af4 JB |
26 | char uuid[DM_UUID_LEN]; |
27 | ||
28 | char *usr_argv_str; | |
29 | uint32_t usr_argc; | |
30 | ||
31 | /* | |
32 | * in_sync_hint gets set when doing is_remote_recovering. It | |
33 | * represents the first region that needs recovery. IOW, the | |
34 | * first zero bit of sync_bits. This can be useful for to limit | |
35 | * traffic for calls like is_remote_recovering and get_resync_work, | |
36 | * but be take care in its use for anything else. | |
37 | */ | |
38 | uint64_t in_sync_hint; | |
39 | ||
40 | spinlock_t flush_lock; | |
41 | struct list_head flush_list; /* only for clear and mark requests */ | |
42 | }; | |
43 | ||
44 | static mempool_t *flush_entry_pool; | |
45 | ||
46 | static void *flush_entry_alloc(gfp_t gfp_mask, void *pool_data) | |
47 | { | |
48 | return kmalloc(sizeof(struct flush_entry), gfp_mask); | |
49 | } | |
50 | ||
51 | static void flush_entry_free(void *element, void *pool_data) | |
52 | { | |
53 | kfree(element); | |
54 | } | |
55 | ||
56 | static int userspace_do_request(struct log_c *lc, const char *uuid, | |
57 | int request_type, char *data, size_t data_size, | |
58 | char *rdata, size_t *rdata_size) | |
59 | { | |
60 | int r; | |
61 | ||
62 | /* | |
63 | * If the server isn't there, -ESRCH is returned, | |
64 | * and we must keep trying until the server is | |
65 | * restored. | |
66 | */ | |
67 | retry: | |
7ec23d50 | 68 | r = dm_consult_userspace(uuid, lc->luid, request_type, data, |
f5db4af4 JB |
69 | data_size, rdata, rdata_size); |
70 | ||
71 | if (r != -ESRCH) | |
72 | return r; | |
73 | ||
74 | DMERR(" Userspace log server not found."); | |
75 | while (1) { | |
76 | set_current_state(TASK_INTERRUPTIBLE); | |
77 | schedule_timeout(2*HZ); | |
78 | DMWARN("Attempting to contact userspace log server..."); | |
7ec23d50 JB |
79 | r = dm_consult_userspace(uuid, lc->luid, DM_ULOG_CTR, |
80 | lc->usr_argv_str, | |
f5db4af4 JB |
81 | strlen(lc->usr_argv_str) + 1, |
82 | NULL, NULL); | |
83 | if (!r) | |
84 | break; | |
85 | } | |
86 | DMINFO("Reconnected to userspace log server... DM_ULOG_CTR complete"); | |
7ec23d50 | 87 | r = dm_consult_userspace(uuid, lc->luid, DM_ULOG_RESUME, NULL, |
f5db4af4 JB |
88 | 0, NULL, NULL); |
89 | if (!r) | |
90 | goto retry; | |
91 | ||
92 | DMERR("Error trying to resume userspace log: %d", r); | |
93 | ||
94 | return -ESRCH; | |
95 | } | |
96 | ||
97 | static int build_constructor_string(struct dm_target *ti, | |
98 | unsigned argc, char **argv, | |
99 | char **ctr_str) | |
100 | { | |
101 | int i, str_size; | |
102 | char *str = NULL; | |
103 | ||
104 | *ctr_str = NULL; | |
105 | ||
106 | for (i = 0, str_size = 0; i < argc; i++) | |
107 | str_size += strlen(argv[i]) + 1; /* +1 for space between args */ | |
108 | ||
109 | str_size += 20; /* Max number of chars in a printed u64 number */ | |
110 | ||
111 | str = kzalloc(str_size, GFP_KERNEL); | |
112 | if (!str) { | |
113 | DMWARN("Unable to allocate memory for constructor string"); | |
114 | return -ENOMEM; | |
115 | } | |
116 | ||
b8313b6d JB |
117 | str_size = sprintf(str, "%llu", (unsigned long long)ti->len); |
118 | for (i = 0; i < argc; i++) | |
119 | str_size += sprintf(str + str_size, " %s", argv[i]); | |
f5db4af4 JB |
120 | |
121 | *ctr_str = str; | |
122 | return str_size; | |
123 | } | |
124 | ||
125 | /* | |
126 | * userspace_ctr | |
127 | * | |
128 | * argv contains: | |
129 | * <UUID> <other args> | |
130 | * Where 'other args' is the userspace implementation specific log | |
131 | * arguments. An example might be: | |
132 | * <UUID> clustered_disk <arg count> <log dev> <region_size> [[no]sync] | |
133 | * | |
134 | * So, this module will strip off the <UUID> for identification purposes | |
135 | * when communicating with userspace about a log; but will pass on everything | |
136 | * else. | |
137 | */ | |
138 | static int userspace_ctr(struct dm_dirty_log *log, struct dm_target *ti, | |
139 | unsigned argc, char **argv) | |
140 | { | |
141 | int r = 0; | |
142 | int str_size; | |
143 | char *ctr_str = NULL; | |
144 | struct log_c *lc = NULL; | |
145 | uint64_t rdata; | |
146 | size_t rdata_size = sizeof(rdata); | |
147 | ||
148 | if (argc < 3) { | |
149 | DMWARN("Too few arguments to userspace dirty log"); | |
150 | return -EINVAL; | |
151 | } | |
152 | ||
153 | lc = kmalloc(sizeof(*lc), GFP_KERNEL); | |
154 | if (!lc) { | |
155 | DMWARN("Unable to allocate userspace log context."); | |
156 | return -ENOMEM; | |
157 | } | |
158 | ||
7ec23d50 | 159 | /* The ptr value is sufficient for local unique id */ |
bca915aa | 160 | lc->luid = (unsigned long)lc; |
7ec23d50 | 161 | |
f5db4af4 JB |
162 | lc->ti = ti; |
163 | ||
164 | if (strlen(argv[0]) > (DM_UUID_LEN - 1)) { | |
165 | DMWARN("UUID argument too long."); | |
166 | kfree(lc); | |
167 | return -EINVAL; | |
168 | } | |
169 | ||
170 | strncpy(lc->uuid, argv[0], DM_UUID_LEN); | |
171 | spin_lock_init(&lc->flush_lock); | |
172 | INIT_LIST_HEAD(&lc->flush_list); | |
173 | ||
174 | str_size = build_constructor_string(ti, argc - 1, argv + 1, &ctr_str); | |
175 | if (str_size < 0) { | |
176 | kfree(lc); | |
177 | return str_size; | |
178 | } | |
179 | ||
180 | /* Send table string */ | |
7ec23d50 | 181 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_CTR, |
f5db4af4 JB |
182 | ctr_str, str_size, NULL, NULL); |
183 | ||
184 | if (r == -ESRCH) { | |
185 | DMERR("Userspace log server not found"); | |
186 | goto out; | |
187 | } | |
188 | ||
189 | /* Since the region size does not change, get it now */ | |
190 | rdata_size = sizeof(rdata); | |
7ec23d50 | 191 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_GET_REGION_SIZE, |
f5db4af4 JB |
192 | NULL, 0, (char *)&rdata, &rdata_size); |
193 | ||
194 | if (r) { | |
195 | DMERR("Failed to get region size of dirty log"); | |
196 | goto out; | |
197 | } | |
198 | ||
199 | lc->region_size = (uint32_t)rdata; | |
200 | lc->region_count = dm_sector_div_up(ti->len, lc->region_size); | |
201 | ||
202 | out: | |
203 | if (r) { | |
204 | kfree(lc); | |
205 | kfree(ctr_str); | |
206 | } else { | |
207 | lc->usr_argv_str = ctr_str; | |
208 | lc->usr_argc = argc; | |
209 | log->context = lc; | |
210 | } | |
211 | ||
212 | return r; | |
213 | } | |
214 | ||
215 | static void userspace_dtr(struct dm_dirty_log *log) | |
216 | { | |
217 | int r; | |
218 | struct log_c *lc = log->context; | |
219 | ||
7ec23d50 | 220 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_DTR, |
f5db4af4 JB |
221 | NULL, 0, |
222 | NULL, NULL); | |
223 | ||
224 | kfree(lc->usr_argv_str); | |
225 | kfree(lc); | |
226 | ||
227 | return; | |
228 | } | |
229 | ||
230 | static int userspace_presuspend(struct dm_dirty_log *log) | |
231 | { | |
232 | int r; | |
233 | struct log_c *lc = log->context; | |
234 | ||
7ec23d50 | 235 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_PRESUSPEND, |
f5db4af4 JB |
236 | NULL, 0, |
237 | NULL, NULL); | |
238 | ||
239 | return r; | |
240 | } | |
241 | ||
242 | static int userspace_postsuspend(struct dm_dirty_log *log) | |
243 | { | |
244 | int r; | |
245 | struct log_c *lc = log->context; | |
246 | ||
7ec23d50 | 247 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_POSTSUSPEND, |
f5db4af4 JB |
248 | NULL, 0, |
249 | NULL, NULL); | |
250 | ||
251 | return r; | |
252 | } | |
253 | ||
254 | static int userspace_resume(struct dm_dirty_log *log) | |
255 | { | |
256 | int r; | |
257 | struct log_c *lc = log->context; | |
258 | ||
259 | lc->in_sync_hint = 0; | |
7ec23d50 | 260 | r = dm_consult_userspace(lc->uuid, lc->luid, DM_ULOG_RESUME, |
f5db4af4 JB |
261 | NULL, 0, |
262 | NULL, NULL); | |
263 | ||
264 | return r; | |
265 | } | |
266 | ||
267 | static uint32_t userspace_get_region_size(struct dm_dirty_log *log) | |
268 | { | |
269 | struct log_c *lc = log->context; | |
270 | ||
271 | return lc->region_size; | |
272 | } | |
273 | ||
274 | /* | |
275 | * userspace_is_clean | |
276 | * | |
277 | * Check whether a region is clean. If there is any sort of | |
278 | * failure when consulting the server, we return not clean. | |
279 | * | |
280 | * Returns: 1 if clean, 0 otherwise | |
281 | */ | |
282 | static int userspace_is_clean(struct dm_dirty_log *log, region_t region) | |
283 | { | |
284 | int r; | |
285 | uint64_t region64 = (uint64_t)region; | |
286 | int64_t is_clean; | |
287 | size_t rdata_size; | |
288 | struct log_c *lc = log->context; | |
289 | ||
290 | rdata_size = sizeof(is_clean); | |
291 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_IS_CLEAN, | |
292 | (char *)®ion64, sizeof(region64), | |
293 | (char *)&is_clean, &rdata_size); | |
294 | ||
295 | return (r) ? 0 : (int)is_clean; | |
296 | } | |
297 | ||
298 | /* | |
299 | * userspace_in_sync | |
300 | * | |
301 | * Check if the region is in-sync. If there is any sort | |
302 | * of failure when consulting the server, we assume that | |
303 | * the region is not in sync. | |
304 | * | |
305 | * If 'can_block' is set, return immediately | |
306 | * | |
307 | * Returns: 1 if in-sync, 0 if not-in-sync, -EWOULDBLOCK | |
308 | */ | |
309 | static int userspace_in_sync(struct dm_dirty_log *log, region_t region, | |
310 | int can_block) | |
311 | { | |
312 | int r; | |
313 | uint64_t region64 = region; | |
314 | int64_t in_sync; | |
315 | size_t rdata_size; | |
316 | struct log_c *lc = log->context; | |
317 | ||
318 | /* | |
319 | * We can never respond directly - even if in_sync_hint is | |
320 | * set. This is because another machine could see a device | |
321 | * failure and mark the region out-of-sync. If we don't go | |
322 | * to userspace to ask, we might think the region is in-sync | |
323 | * and allow a read to pick up data that is stale. (This is | |
324 | * very unlikely if a device actually fails; but it is very | |
325 | * likely if a connection to one device from one machine fails.) | |
326 | * | |
327 | * There still might be a problem if the mirror caches the region | |
328 | * state as in-sync... but then this call would not be made. So, | |
329 | * that is a mirror problem. | |
330 | */ | |
331 | if (!can_block) | |
332 | return -EWOULDBLOCK; | |
333 | ||
334 | rdata_size = sizeof(in_sync); | |
335 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_IN_SYNC, | |
336 | (char *)®ion64, sizeof(region64), | |
337 | (char *)&in_sync, &rdata_size); | |
338 | return (r) ? 0 : (int)in_sync; | |
339 | } | |
340 | ||
341 | /* | |
342 | * userspace_flush | |
343 | * | |
344 | * This function is ok to block. | |
345 | * The flush happens in two stages. First, it sends all | |
346 | * clear/mark requests that are on the list. Then it | |
347 | * tells the server to commit them. This gives the | |
348 | * server a chance to optimise the commit, instead of | |
349 | * doing it for every request. | |
350 | * | |
351 | * Additionally, we could implement another thread that | |
352 | * sends the requests up to the server - reducing the | |
353 | * load on flush. Then the flush would have less in | |
354 | * the list and be responsible for the finishing commit. | |
355 | * | |
356 | * Returns: 0 on success, < 0 on failure | |
357 | */ | |
358 | static int userspace_flush(struct dm_dirty_log *log) | |
359 | { | |
360 | int r = 0; | |
361 | unsigned long flags; | |
362 | struct log_c *lc = log->context; | |
363 | LIST_HEAD(flush_list); | |
364 | struct flush_entry *fe, *tmp_fe; | |
365 | ||
366 | spin_lock_irqsave(&lc->flush_lock, flags); | |
367 | list_splice_init(&lc->flush_list, &flush_list); | |
368 | spin_unlock_irqrestore(&lc->flush_lock, flags); | |
369 | ||
370 | if (list_empty(&flush_list)) | |
371 | return 0; | |
372 | ||
373 | /* | |
374 | * FIXME: Count up requests, group request types, | |
375 | * allocate memory to stick all requests in and | |
376 | * send to server in one go. Failing the allocation, | |
377 | * do it one by one. | |
378 | */ | |
379 | ||
380 | list_for_each_entry(fe, &flush_list, list) { | |
381 | r = userspace_do_request(lc, lc->uuid, fe->type, | |
382 | (char *)&fe->region, | |
383 | sizeof(fe->region), | |
384 | NULL, NULL); | |
385 | if (r) | |
386 | goto fail; | |
387 | } | |
388 | ||
389 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_FLUSH, | |
390 | NULL, 0, NULL, NULL); | |
391 | ||
392 | fail: | |
393 | /* | |
394 | * We can safely remove these entries, even if failure. | |
395 | * Calling code will receive an error and will know that | |
396 | * the log facility has failed. | |
397 | */ | |
398 | list_for_each_entry_safe(fe, tmp_fe, &flush_list, list) { | |
399 | list_del(&fe->list); | |
400 | mempool_free(fe, flush_entry_pool); | |
401 | } | |
402 | ||
403 | if (r) | |
404 | dm_table_event(lc->ti->table); | |
405 | ||
406 | return r; | |
407 | } | |
408 | ||
409 | /* | |
410 | * userspace_mark_region | |
411 | * | |
412 | * This function should avoid blocking unless absolutely required. | |
413 | * (Memory allocation is valid for blocking.) | |
414 | */ | |
415 | static void userspace_mark_region(struct dm_dirty_log *log, region_t region) | |
416 | { | |
417 | unsigned long flags; | |
418 | struct log_c *lc = log->context; | |
419 | struct flush_entry *fe; | |
420 | ||
421 | /* Wait for an allocation, but _never_ fail */ | |
422 | fe = mempool_alloc(flush_entry_pool, GFP_NOIO); | |
423 | BUG_ON(!fe); | |
424 | ||
425 | spin_lock_irqsave(&lc->flush_lock, flags); | |
426 | fe->type = DM_ULOG_MARK_REGION; | |
427 | fe->region = region; | |
428 | list_add(&fe->list, &lc->flush_list); | |
429 | spin_unlock_irqrestore(&lc->flush_lock, flags); | |
430 | ||
431 | return; | |
432 | } | |
433 | ||
434 | /* | |
435 | * userspace_clear_region | |
436 | * | |
437 | * This function must not block. | |
438 | * So, the alloc can't block. In the worst case, it is ok to | |
439 | * fail. It would simply mean we can't clear the region. | |
440 | * Does nothing to current sync context, but does mean | |
441 | * the region will be re-sync'ed on a reload of the mirror | |
442 | * even though it is in-sync. | |
443 | */ | |
444 | static void userspace_clear_region(struct dm_dirty_log *log, region_t region) | |
445 | { | |
446 | unsigned long flags; | |
447 | struct log_c *lc = log->context; | |
448 | struct flush_entry *fe; | |
449 | ||
450 | /* | |
451 | * If we fail to allocate, we skip the clearing of | |
452 | * the region. This doesn't hurt us in any way, except | |
453 | * to cause the region to be resync'ed when the | |
454 | * device is activated next time. | |
455 | */ | |
456 | fe = mempool_alloc(flush_entry_pool, GFP_ATOMIC); | |
457 | if (!fe) { | |
458 | DMERR("Failed to allocate memory to clear region."); | |
459 | return; | |
460 | } | |
461 | ||
462 | spin_lock_irqsave(&lc->flush_lock, flags); | |
463 | fe->type = DM_ULOG_CLEAR_REGION; | |
464 | fe->region = region; | |
465 | list_add(&fe->list, &lc->flush_list); | |
466 | spin_unlock_irqrestore(&lc->flush_lock, flags); | |
467 | ||
468 | return; | |
469 | } | |
470 | ||
471 | /* | |
472 | * userspace_get_resync_work | |
473 | * | |
474 | * Get a region that needs recovery. It is valid to return | |
475 | * an error for this function. | |
476 | * | |
477 | * Returns: 1 if region filled, 0 if no work, <0 on error | |
478 | */ | |
479 | static int userspace_get_resync_work(struct dm_dirty_log *log, region_t *region) | |
480 | { | |
481 | int r; | |
482 | size_t rdata_size; | |
483 | struct log_c *lc = log->context; | |
484 | struct { | |
485 | int64_t i; /* 64-bit for mix arch compatibility */ | |
486 | region_t r; | |
487 | } pkg; | |
488 | ||
489 | if (lc->in_sync_hint >= lc->region_count) | |
490 | return 0; | |
491 | ||
492 | rdata_size = sizeof(pkg); | |
493 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_RESYNC_WORK, | |
494 | NULL, 0, | |
495 | (char *)&pkg, &rdata_size); | |
496 | ||
497 | *region = pkg.r; | |
498 | return (r) ? r : (int)pkg.i; | |
499 | } | |
500 | ||
501 | /* | |
502 | * userspace_set_region_sync | |
503 | * | |
504 | * Set the sync status of a given region. This function | |
505 | * must not fail. | |
506 | */ | |
507 | static void userspace_set_region_sync(struct dm_dirty_log *log, | |
508 | region_t region, int in_sync) | |
509 | { | |
510 | int r; | |
511 | struct log_c *lc = log->context; | |
512 | struct { | |
513 | region_t r; | |
514 | int64_t i; | |
515 | } pkg; | |
516 | ||
517 | pkg.r = region; | |
518 | pkg.i = (int64_t)in_sync; | |
519 | ||
520 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_SET_REGION_SYNC, | |
521 | (char *)&pkg, sizeof(pkg), | |
522 | NULL, NULL); | |
523 | ||
524 | /* | |
525 | * It would be nice to be able to report failures. | |
526 | * However, it is easy emough to detect and resolve. | |
527 | */ | |
528 | return; | |
529 | } | |
530 | ||
531 | /* | |
532 | * userspace_get_sync_count | |
533 | * | |
534 | * If there is any sort of failure when consulting the server, | |
535 | * we assume that the sync count is zero. | |
536 | * | |
537 | * Returns: sync count on success, 0 on failure | |
538 | */ | |
539 | static region_t userspace_get_sync_count(struct dm_dirty_log *log) | |
540 | { | |
541 | int r; | |
542 | size_t rdata_size; | |
543 | uint64_t sync_count; | |
544 | struct log_c *lc = log->context; | |
545 | ||
546 | rdata_size = sizeof(sync_count); | |
547 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_GET_SYNC_COUNT, | |
548 | NULL, 0, | |
549 | (char *)&sync_count, &rdata_size); | |
550 | ||
551 | if (r) | |
552 | return 0; | |
553 | ||
554 | if (sync_count >= lc->region_count) | |
555 | lc->in_sync_hint = lc->region_count; | |
556 | ||
557 | return (region_t)sync_count; | |
558 | } | |
559 | ||
560 | /* | |
561 | * userspace_status | |
562 | * | |
563 | * Returns: amount of space consumed | |
564 | */ | |
565 | static int userspace_status(struct dm_dirty_log *log, status_type_t status_type, | |
566 | char *result, unsigned maxlen) | |
567 | { | |
568 | int r = 0; | |
b8313b6d | 569 | char *table_args; |
f5db4af4 JB |
570 | size_t sz = (size_t)maxlen; |
571 | struct log_c *lc = log->context; | |
572 | ||
573 | switch (status_type) { | |
574 | case STATUSTYPE_INFO: | |
575 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_STATUS_INFO, | |
576 | NULL, 0, | |
577 | result, &sz); | |
578 | ||
579 | if (r) { | |
580 | sz = 0; | |
581 | DMEMIT("%s 1 COM_FAILURE", log->type->name); | |
582 | } | |
583 | break; | |
584 | case STATUSTYPE_TABLE: | |
585 | sz = 0; | |
0d03d59d | 586 | table_args = strchr(lc->usr_argv_str, ' '); |
b8313b6d JB |
587 | BUG_ON(!table_args); /* There will always be a ' ' */ |
588 | table_args++; | |
589 | ||
590 | DMEMIT("%s %u %s %s ", log->type->name, lc->usr_argc, | |
591 | lc->uuid, table_args); | |
f5db4af4 JB |
592 | break; |
593 | } | |
594 | return (r) ? 0 : (int)sz; | |
595 | } | |
596 | ||
597 | /* | |
598 | * userspace_is_remote_recovering | |
599 | * | |
600 | * Returns: 1 if region recovering, 0 otherwise | |
601 | */ | |
602 | static int userspace_is_remote_recovering(struct dm_dirty_log *log, | |
603 | region_t region) | |
604 | { | |
605 | int r; | |
606 | uint64_t region64 = region; | |
607 | struct log_c *lc = log->context; | |
608 | static unsigned long long limit; | |
609 | struct { | |
610 | int64_t is_recovering; | |
611 | uint64_t in_sync_hint; | |
612 | } pkg; | |
613 | size_t rdata_size = sizeof(pkg); | |
614 | ||
615 | /* | |
616 | * Once the mirror has been reported to be in-sync, | |
617 | * it will never again ask for recovery work. So, | |
618 | * we can safely say there is not a remote machine | |
619 | * recovering if the device is in-sync. (in_sync_hint | |
620 | * must be reset at resume time.) | |
621 | */ | |
622 | if (region < lc->in_sync_hint) | |
623 | return 0; | |
624 | else if (jiffies < limit) | |
625 | return 1; | |
626 | ||
627 | limit = jiffies + (HZ / 4); | |
628 | r = userspace_do_request(lc, lc->uuid, DM_ULOG_IS_REMOTE_RECOVERING, | |
629 | (char *)®ion64, sizeof(region64), | |
630 | (char *)&pkg, &rdata_size); | |
631 | if (r) | |
632 | return 1; | |
633 | ||
634 | lc->in_sync_hint = pkg.in_sync_hint; | |
635 | ||
636 | return (int)pkg.is_recovering; | |
637 | } | |
638 | ||
639 | static struct dm_dirty_log_type _userspace_type = { | |
640 | .name = "userspace", | |
641 | .module = THIS_MODULE, | |
642 | .ctr = userspace_ctr, | |
643 | .dtr = userspace_dtr, | |
644 | .presuspend = userspace_presuspend, | |
645 | .postsuspend = userspace_postsuspend, | |
646 | .resume = userspace_resume, | |
647 | .get_region_size = userspace_get_region_size, | |
648 | .is_clean = userspace_is_clean, | |
649 | .in_sync = userspace_in_sync, | |
650 | .flush = userspace_flush, | |
651 | .mark_region = userspace_mark_region, | |
652 | .clear_region = userspace_clear_region, | |
653 | .get_resync_work = userspace_get_resync_work, | |
654 | .set_region_sync = userspace_set_region_sync, | |
655 | .get_sync_count = userspace_get_sync_count, | |
656 | .status = userspace_status, | |
657 | .is_remote_recovering = userspace_is_remote_recovering, | |
658 | }; | |
659 | ||
660 | static int __init userspace_dirty_log_init(void) | |
661 | { | |
662 | int r = 0; | |
663 | ||
664 | flush_entry_pool = mempool_create(100, flush_entry_alloc, | |
665 | flush_entry_free, NULL); | |
666 | ||
667 | if (!flush_entry_pool) { | |
668 | DMWARN("Unable to create flush_entry_pool: No memory."); | |
669 | return -ENOMEM; | |
670 | } | |
671 | ||
672 | r = dm_ulog_tfr_init(); | |
673 | if (r) { | |
674 | DMWARN("Unable to initialize userspace log communications"); | |
675 | mempool_destroy(flush_entry_pool); | |
676 | return r; | |
677 | } | |
678 | ||
679 | r = dm_dirty_log_type_register(&_userspace_type); | |
680 | if (r) { | |
681 | DMWARN("Couldn't register userspace dirty log type"); | |
682 | dm_ulog_tfr_exit(); | |
683 | mempool_destroy(flush_entry_pool); | |
684 | return r; | |
685 | } | |
686 | ||
687 | DMINFO("version 1.0.0 loaded"); | |
688 | return 0; | |
689 | } | |
690 | ||
691 | static void __exit userspace_dirty_log_exit(void) | |
692 | { | |
693 | dm_dirty_log_type_unregister(&_userspace_type); | |
694 | dm_ulog_tfr_exit(); | |
695 | mempool_destroy(flush_entry_pool); | |
696 | ||
697 | DMINFO("version 1.0.0 unloaded"); | |
698 | return; | |
699 | } | |
700 | ||
701 | module_init(userspace_dirty_log_init); | |
702 | module_exit(userspace_dirty_log_exit); | |
703 | ||
704 | MODULE_DESCRIPTION(DM_NAME " userspace dirty log link"); | |
705 | MODULE_AUTHOR("Jonathan Brassow <dm-devel@redhat.com>"); | |
706 | MODULE_LICENSE("GPL"); |