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Commit | Line | Data |
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8e854e9c GR |
1 | /* |
2 | * Copyright (C) 2015, SUSE | |
3 | * | |
4 | * This program is free software; you can redistribute it and/or modify | |
5 | * it under the terms of the GNU General Public License as published by | |
6 | * the Free Software Foundation; either version 2, or (at your option) | |
7 | * any later version. | |
8 | * | |
9 | */ | |
10 | ||
11 | ||
12 | #include <linux/module.h> | |
47741b7c GR |
13 | #include <linux/dlm.h> |
14 | #include <linux/sched.h> | |
15 | #include "md.h" | |
e94987db | 16 | #include "bitmap.h" |
edb39c9d | 17 | #include "md-cluster.h" |
47741b7c GR |
18 | |
19 | #define LVB_SIZE 64 | |
20 | ||
21 | struct dlm_lock_resource { | |
22 | dlm_lockspace_t *ls; | |
23 | struct dlm_lksb lksb; | |
24 | char *name; /* lock name. */ | |
25 | uint32_t flags; /* flags to pass to dlm_lock() */ | |
47741b7c | 26 | struct completion completion; /* completion for synchronized locking */ |
c4ce867f GR |
27 | void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ |
28 | struct mddev *mddev; /* pointing back to mddev. */ | |
29 | }; | |
30 | ||
96ae923a GR |
31 | struct suspend_info { |
32 | int slot; | |
33 | sector_t lo; | |
34 | sector_t hi; | |
35 | struct list_head list; | |
36 | }; | |
37 | ||
38 | struct resync_info { | |
39 | __le64 lo; | |
40 | __le64 hi; | |
41 | }; | |
42 | ||
c4ce867f GR |
43 | struct md_cluster_info { |
44 | /* dlm lock space and resources for clustered raid. */ | |
45 | dlm_lockspace_t *lockspace; | |
cf921cc1 GR |
46 | int slot_number; |
47 | struct completion completion; | |
c4ce867f GR |
48 | struct dlm_lock_resource *sb_lock; |
49 | struct mutex sb_mutex; | |
54519c5f | 50 | struct dlm_lock_resource *bitmap_lockres; |
96ae923a GR |
51 | struct list_head suspend_list; |
52 | spinlock_t suspend_lock; | |
e94987db GR |
53 | struct md_thread *recovery_thread; |
54 | unsigned long recovery_map; | |
4664680c GR |
55 | /* communication loc resources */ |
56 | struct dlm_lock_resource *ack_lockres; | |
57 | struct dlm_lock_resource *message_lockres; | |
58 | struct dlm_lock_resource *token_lockres; | |
59 | struct md_thread *recv_thread; | |
60 | }; | |
61 | ||
62 | enum msg_type { | |
63 | METADATA_UPDATED = 0, | |
64 | RESYNCING, | |
65 | }; | |
66 | ||
67 | struct cluster_msg { | |
68 | int type; | |
69 | int slot; | |
70 | sector_t low; | |
71 | sector_t high; | |
47741b7c GR |
72 | }; |
73 | ||
74 | static void sync_ast(void *arg) | |
75 | { | |
76 | struct dlm_lock_resource *res; | |
77 | ||
78 | res = (struct dlm_lock_resource *) arg; | |
79 | complete(&res->completion); | |
80 | } | |
81 | ||
82 | static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) | |
83 | { | |
84 | int ret = 0; | |
85 | ||
86 | init_completion(&res->completion); | |
87 | ret = dlm_lock(res->ls, mode, &res->lksb, | |
88 | res->flags, res->name, strlen(res->name), | |
89 | 0, sync_ast, res, res->bast); | |
90 | if (ret) | |
91 | return ret; | |
92 | wait_for_completion(&res->completion); | |
93 | return res->lksb.sb_status; | |
94 | } | |
95 | ||
96 | static int dlm_unlock_sync(struct dlm_lock_resource *res) | |
97 | { | |
98 | return dlm_lock_sync(res, DLM_LOCK_NL); | |
99 | } | |
100 | ||
c4ce867f | 101 | static struct dlm_lock_resource *lockres_init(struct mddev *mddev, |
47741b7c GR |
102 | char *name, void (*bastfn)(void *arg, int mode), int with_lvb) |
103 | { | |
104 | struct dlm_lock_resource *res = NULL; | |
105 | int ret, namelen; | |
c4ce867f | 106 | struct md_cluster_info *cinfo = mddev->cluster_info; |
47741b7c GR |
107 | |
108 | res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); | |
109 | if (!res) | |
110 | return NULL; | |
c4ce867f GR |
111 | res->ls = cinfo->lockspace; |
112 | res->mddev = mddev; | |
47741b7c GR |
113 | namelen = strlen(name); |
114 | res->name = kzalloc(namelen + 1, GFP_KERNEL); | |
115 | if (!res->name) { | |
116 | pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); | |
117 | goto out_err; | |
118 | } | |
119 | strlcpy(res->name, name, namelen + 1); | |
120 | if (with_lvb) { | |
121 | res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); | |
122 | if (!res->lksb.sb_lvbptr) { | |
123 | pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); | |
124 | goto out_err; | |
125 | } | |
126 | res->flags = DLM_LKF_VALBLK; | |
127 | } | |
128 | ||
129 | if (bastfn) | |
130 | res->bast = bastfn; | |
131 | ||
132 | res->flags |= DLM_LKF_EXPEDITE; | |
133 | ||
134 | ret = dlm_lock_sync(res, DLM_LOCK_NL); | |
135 | if (ret) { | |
136 | pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); | |
137 | goto out_err; | |
138 | } | |
139 | res->flags &= ~DLM_LKF_EXPEDITE; | |
140 | res->flags |= DLM_LKF_CONVERT; | |
141 | ||
142 | return res; | |
143 | out_err: | |
144 | kfree(res->lksb.sb_lvbptr); | |
145 | kfree(res->name); | |
146 | kfree(res); | |
147 | return NULL; | |
148 | } | |
149 | ||
150 | static void lockres_free(struct dlm_lock_resource *res) | |
151 | { | |
152 | if (!res) | |
153 | return; | |
154 | ||
155 | init_completion(&res->completion); | |
156 | dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res); | |
157 | wait_for_completion(&res->completion); | |
158 | ||
159 | kfree(res->name); | |
160 | kfree(res->lksb.sb_lvbptr); | |
161 | kfree(res); | |
162 | } | |
8e854e9c | 163 | |
c4ce867f GR |
164 | static char *pretty_uuid(char *dest, char *src) |
165 | { | |
166 | int i, len = 0; | |
167 | ||
168 | for (i = 0; i < 16; i++) { | |
169 | if (i == 4 || i == 6 || i == 8 || i == 10) | |
170 | len += sprintf(dest + len, "-"); | |
171 | len += sprintf(dest + len, "%02x", (__u8)src[i]); | |
172 | } | |
173 | return dest; | |
174 | } | |
175 | ||
96ae923a GR |
176 | static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres, |
177 | sector_t lo, sector_t hi) | |
178 | { | |
179 | struct resync_info *ri; | |
180 | ||
181 | ri = (struct resync_info *)lockres->lksb.sb_lvbptr; | |
182 | ri->lo = cpu_to_le64(lo); | |
183 | ri->hi = cpu_to_le64(hi); | |
184 | } | |
185 | ||
186 | static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres) | |
187 | { | |
188 | struct resync_info ri; | |
189 | struct suspend_info *s = NULL; | |
190 | sector_t hi = 0; | |
191 | ||
192 | dlm_lock_sync(lockres, DLM_LOCK_CR); | |
193 | memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); | |
194 | hi = le64_to_cpu(ri.hi); | |
195 | if (ri.hi > 0) { | |
196 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); | |
197 | if (!s) | |
198 | goto out; | |
199 | s->hi = hi; | |
200 | s->lo = le64_to_cpu(ri.lo); | |
201 | } | |
202 | dlm_unlock_sync(lockres); | |
203 | out: | |
204 | return s; | |
205 | } | |
206 | ||
e94987db GR |
207 | void recover_bitmaps(struct md_thread *thread) |
208 | { | |
209 | struct mddev *mddev = thread->mddev; | |
210 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
211 | struct dlm_lock_resource *bm_lockres; | |
212 | char str[64]; | |
213 | int slot, ret; | |
214 | struct suspend_info *s, *tmp; | |
215 | sector_t lo, hi; | |
216 | ||
217 | while (cinfo->recovery_map) { | |
218 | slot = fls64((u64)cinfo->recovery_map) - 1; | |
219 | ||
220 | /* Clear suspend_area associated with the bitmap */ | |
221 | spin_lock_irq(&cinfo->suspend_lock); | |
222 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
223 | if (slot == s->slot) { | |
224 | list_del(&s->list); | |
225 | kfree(s); | |
226 | } | |
227 | spin_unlock_irq(&cinfo->suspend_lock); | |
228 | ||
229 | snprintf(str, 64, "bitmap%04d", slot); | |
230 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
231 | if (!bm_lockres) { | |
232 | pr_err("md-cluster: Cannot initialize bitmaps\n"); | |
233 | goto clear_bit; | |
234 | } | |
235 | ||
236 | ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
237 | if (ret) { | |
238 | pr_err("md-cluster: Could not DLM lock %s: %d\n", | |
239 | str, ret); | |
240 | goto clear_bit; | |
241 | } | |
242 | ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi); | |
4b26a08a | 243 | if (ret) { |
e94987db | 244 | pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); |
4b26a08a GR |
245 | goto dlm_unlock; |
246 | } | |
247 | if (hi > 0) { | |
248 | /* TODO:Wait for current resync to get over */ | |
249 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
250 | if (lo < mddev->recovery_cp) | |
251 | mddev->recovery_cp = lo; | |
252 | md_check_recovery(mddev); | |
253 | } | |
254 | dlm_unlock: | |
e94987db GR |
255 | dlm_unlock_sync(bm_lockres); |
256 | clear_bit: | |
257 | clear_bit(slot, &cinfo->recovery_map); | |
258 | } | |
259 | } | |
260 | ||
cf921cc1 GR |
261 | static void recover_prep(void *arg) |
262 | { | |
263 | } | |
264 | ||
265 | static void recover_slot(void *arg, struct dlm_slot *slot) | |
266 | { | |
267 | struct mddev *mddev = arg; | |
268 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
269 | ||
270 | pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", | |
271 | mddev->bitmap_info.cluster_name, | |
272 | slot->nodeid, slot->slot, | |
273 | cinfo->slot_number); | |
e94987db GR |
274 | set_bit(slot->slot - 1, &cinfo->recovery_map); |
275 | if (!cinfo->recovery_thread) { | |
276 | cinfo->recovery_thread = md_register_thread(recover_bitmaps, | |
277 | mddev, "recover"); | |
278 | if (!cinfo->recovery_thread) { | |
279 | pr_warn("md-cluster: Could not create recovery thread\n"); | |
280 | return; | |
281 | } | |
282 | } | |
283 | md_wakeup_thread(cinfo->recovery_thread); | |
cf921cc1 GR |
284 | } |
285 | ||
286 | static void recover_done(void *arg, struct dlm_slot *slots, | |
287 | int num_slots, int our_slot, | |
288 | uint32_t generation) | |
289 | { | |
290 | struct mddev *mddev = arg; | |
291 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
292 | ||
293 | cinfo->slot_number = our_slot; | |
294 | complete(&cinfo->completion); | |
295 | } | |
296 | ||
297 | static const struct dlm_lockspace_ops md_ls_ops = { | |
298 | .recover_prep = recover_prep, | |
299 | .recover_slot = recover_slot, | |
300 | .recover_done = recover_done, | |
301 | }; | |
302 | ||
4664680c GR |
303 | /* |
304 | * The BAST function for the ack lock resource | |
305 | * This function wakes up the receive thread in | |
306 | * order to receive and process the message. | |
307 | */ | |
308 | static void ack_bast(void *arg, int mode) | |
309 | { | |
310 | struct dlm_lock_resource *res = (struct dlm_lock_resource *)arg; | |
311 | struct md_cluster_info *cinfo = res->mddev->cluster_info; | |
312 | ||
313 | if (mode == DLM_LOCK_EX) | |
314 | md_wakeup_thread(cinfo->recv_thread); | |
315 | } | |
316 | ||
e59721cc GR |
317 | static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot) |
318 | { | |
319 | struct suspend_info *s, *tmp; | |
320 | ||
321 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
322 | if (slot == s->slot) { | |
323 | pr_info("%s:%d Deleting suspend_info: %d\n", | |
324 | __func__, __LINE__, slot); | |
325 | list_del(&s->list); | |
326 | kfree(s); | |
327 | break; | |
328 | } | |
329 | } | |
330 | ||
331 | static void remove_suspend_info(struct md_cluster_info *cinfo, int slot) | |
332 | { | |
333 | spin_lock_irq(&cinfo->suspend_lock); | |
334 | __remove_suspend_info(cinfo, slot); | |
335 | spin_unlock_irq(&cinfo->suspend_lock); | |
336 | } | |
337 | ||
338 | ||
339 | static void process_suspend_info(struct md_cluster_info *cinfo, | |
340 | int slot, sector_t lo, sector_t hi) | |
341 | { | |
342 | struct suspend_info *s; | |
343 | ||
344 | if (!hi) { | |
345 | remove_suspend_info(cinfo, slot); | |
346 | return; | |
347 | } | |
348 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); | |
349 | if (!s) | |
350 | return; | |
351 | s->slot = slot; | |
352 | s->lo = lo; | |
353 | s->hi = hi; | |
354 | spin_lock_irq(&cinfo->suspend_lock); | |
355 | /* Remove existing entry (if exists) before adding */ | |
356 | __remove_suspend_info(cinfo, slot); | |
357 | list_add(&s->list, &cinfo->suspend_list); | |
358 | spin_unlock_irq(&cinfo->suspend_lock); | |
359 | } | |
360 | ||
4664680c GR |
361 | static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) |
362 | { | |
363 | switch (msg->type) { | |
364 | case METADATA_UPDATED: | |
365 | pr_info("%s: %d Received message: METADATA_UPDATE from %d\n", | |
366 | __func__, __LINE__, msg->slot); | |
1d7e3e96 | 367 | md_reload_sb(mddev); |
4664680c GR |
368 | break; |
369 | case RESYNCING: | |
370 | pr_info("%s: %d Received message: RESYNCING from %d\n", | |
371 | __func__, __LINE__, msg->slot); | |
e59721cc GR |
372 | process_suspend_info(mddev->cluster_info, msg->slot, |
373 | msg->low, msg->high); | |
4664680c GR |
374 | break; |
375 | }; | |
376 | } | |
377 | ||
378 | /* | |
379 | * thread for receiving message | |
380 | */ | |
381 | static void recv_daemon(struct md_thread *thread) | |
382 | { | |
383 | struct md_cluster_info *cinfo = thread->mddev->cluster_info; | |
384 | struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; | |
385 | struct dlm_lock_resource *message_lockres = cinfo->message_lockres; | |
386 | struct cluster_msg msg; | |
387 | ||
388 | /*get CR on Message*/ | |
389 | if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { | |
390 | pr_err("md/raid1:failed to get CR on MESSAGE\n"); | |
391 | return; | |
392 | } | |
393 | ||
394 | /* read lvb and wake up thread to process this message_lockres */ | |
395 | memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); | |
396 | process_recvd_msg(thread->mddev, &msg); | |
397 | ||
398 | /*release CR on ack_lockres*/ | |
399 | dlm_unlock_sync(ack_lockres); | |
400 | /*up-convert to EX on message_lockres*/ | |
401 | dlm_lock_sync(message_lockres, DLM_LOCK_EX); | |
402 | /*get CR on ack_lockres again*/ | |
403 | dlm_lock_sync(ack_lockres, DLM_LOCK_CR); | |
404 | /*release CR on message_lockres*/ | |
405 | dlm_unlock_sync(message_lockres); | |
406 | } | |
407 | ||
601b515c GR |
408 | /* lock_comm() |
409 | * Takes the lock on the TOKEN lock resource so no other | |
410 | * node can communicate while the operation is underway. | |
411 | */ | |
412 | static int lock_comm(struct md_cluster_info *cinfo) | |
413 | { | |
414 | int error; | |
415 | ||
416 | error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); | |
417 | if (error) | |
418 | pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", | |
419 | __func__, __LINE__, error); | |
420 | return error; | |
421 | } | |
422 | ||
423 | static void unlock_comm(struct md_cluster_info *cinfo) | |
424 | { | |
425 | dlm_unlock_sync(cinfo->token_lockres); | |
426 | } | |
427 | ||
428 | /* __sendmsg() | |
429 | * This function performs the actual sending of the message. This function is | |
430 | * usually called after performing the encompassing operation | |
431 | * The function: | |
432 | * 1. Grabs the message lockresource in EX mode | |
433 | * 2. Copies the message to the message LVB | |
434 | * 3. Downconverts message lockresource to CR | |
435 | * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes | |
436 | * and the other nodes read the message. The thread will wait here until all other | |
437 | * nodes have released ack lock resource. | |
438 | * 5. Downconvert ack lockresource to CR | |
439 | */ | |
440 | static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) | |
441 | { | |
442 | int error; | |
443 | int slot = cinfo->slot_number - 1; | |
444 | ||
445 | cmsg->slot = cpu_to_le32(slot); | |
446 | /*get EX on Message*/ | |
447 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); | |
448 | if (error) { | |
449 | pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); | |
450 | goto failed_message; | |
451 | } | |
452 | ||
453 | memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, | |
454 | sizeof(struct cluster_msg)); | |
455 | /*down-convert EX to CR on Message*/ | |
456 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CR); | |
457 | if (error) { | |
458 | pr_err("md-cluster: failed to convert EX to CR on MESSAGE(%d)\n", | |
459 | error); | |
460 | goto failed_message; | |
461 | } | |
462 | ||
463 | /*up-convert CR to EX on Ack*/ | |
464 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); | |
465 | if (error) { | |
466 | pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", | |
467 | error); | |
468 | goto failed_ack; | |
469 | } | |
470 | ||
471 | /*down-convert EX to CR on Ack*/ | |
472 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); | |
473 | if (error) { | |
474 | pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", | |
475 | error); | |
476 | goto failed_ack; | |
477 | } | |
478 | ||
479 | failed_ack: | |
480 | dlm_unlock_sync(cinfo->message_lockres); | |
481 | failed_message: | |
482 | return error; | |
483 | } | |
484 | ||
485 | static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) | |
486 | { | |
487 | int ret; | |
488 | ||
489 | lock_comm(cinfo); | |
490 | ret = __sendmsg(cinfo, cmsg); | |
491 | unlock_comm(cinfo); | |
492 | return ret; | |
493 | } | |
494 | ||
96ae923a GR |
495 | static int gather_all_resync_info(struct mddev *mddev, int total_slots) |
496 | { | |
497 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
498 | int i, ret = 0; | |
499 | struct dlm_lock_resource *bm_lockres; | |
500 | struct suspend_info *s; | |
501 | char str[64]; | |
502 | ||
503 | ||
504 | for (i = 0; i < total_slots; i++) { | |
505 | memset(str, '\0', 64); | |
506 | snprintf(str, 64, "bitmap%04d", i); | |
507 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
508 | if (!bm_lockres) | |
509 | return -ENOMEM; | |
510 | if (i == (cinfo->slot_number - 1)) | |
511 | continue; | |
512 | ||
513 | bm_lockres->flags |= DLM_LKF_NOQUEUE; | |
514 | ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
515 | if (ret == -EAGAIN) { | |
516 | memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE); | |
517 | s = read_resync_info(mddev, bm_lockres); | |
518 | if (s) { | |
519 | pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", | |
520 | __func__, __LINE__, | |
521 | (unsigned long long) s->lo, | |
522 | (unsigned long long) s->hi, i); | |
523 | spin_lock_irq(&cinfo->suspend_lock); | |
524 | s->slot = i; | |
525 | list_add(&s->list, &cinfo->suspend_list); | |
526 | spin_unlock_irq(&cinfo->suspend_lock); | |
527 | } | |
528 | ret = 0; | |
529 | lockres_free(bm_lockres); | |
530 | continue; | |
531 | } | |
532 | if (ret) | |
533 | goto out; | |
534 | /* TODO: Read the disk bitmap sb and check if it needs recovery */ | |
535 | dlm_unlock_sync(bm_lockres); | |
536 | lockres_free(bm_lockres); | |
537 | } | |
538 | out: | |
539 | return ret; | |
540 | } | |
541 | ||
edb39c9d GR |
542 | static int join(struct mddev *mddev, int nodes) |
543 | { | |
c4ce867f | 544 | struct md_cluster_info *cinfo; |
cf921cc1 | 545 | int ret, ops_rv; |
c4ce867f GR |
546 | char str[64]; |
547 | ||
548 | if (!try_module_get(THIS_MODULE)) | |
549 | return -ENOENT; | |
550 | ||
551 | cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); | |
552 | if (!cinfo) | |
553 | return -ENOMEM; | |
554 | ||
cf921cc1 GR |
555 | init_completion(&cinfo->completion); |
556 | ||
557 | mutex_init(&cinfo->sb_mutex); | |
558 | mddev->cluster_info = cinfo; | |
559 | ||
c4ce867f GR |
560 | memset(str, 0, 64); |
561 | pretty_uuid(str, mddev->uuid); | |
cf921cc1 GR |
562 | ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, |
563 | DLM_LSFL_FS, LVB_SIZE, | |
564 | &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace); | |
c4ce867f GR |
565 | if (ret) |
566 | goto err; | |
cf921cc1 | 567 | wait_for_completion(&cinfo->completion); |
b97e9257 GR |
568 | if (nodes <= cinfo->slot_number) { |
569 | pr_err("md-cluster: Slot allotted(%d) greater than available slots(%d)", cinfo->slot_number - 1, | |
570 | nodes); | |
571 | ret = -ERANGE; | |
572 | goto err; | |
573 | } | |
c4ce867f GR |
574 | cinfo->sb_lock = lockres_init(mddev, "cmd-super", |
575 | NULL, 0); | |
576 | if (!cinfo->sb_lock) { | |
577 | ret = -ENOMEM; | |
578 | goto err; | |
579 | } | |
4664680c GR |
580 | /* Initiate the communication resources */ |
581 | ret = -ENOMEM; | |
582 | cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); | |
583 | if (!cinfo->recv_thread) { | |
584 | pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); | |
585 | goto err; | |
586 | } | |
587 | cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); | |
588 | if (!cinfo->message_lockres) | |
589 | goto err; | |
590 | cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); | |
591 | if (!cinfo->token_lockres) | |
592 | goto err; | |
593 | cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); | |
594 | if (!cinfo->ack_lockres) | |
595 | goto err; | |
596 | /* get sync CR lock on ACK. */ | |
597 | if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) | |
598 | pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", | |
599 | ret); | |
54519c5f GR |
600 | |
601 | pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); | |
602 | snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); | |
603 | cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); | |
604 | if (!cinfo->bitmap_lockres) | |
605 | goto err; | |
606 | if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { | |
607 | pr_err("Failed to get bitmap lock\n"); | |
608 | ret = -EINVAL; | |
609 | goto err; | |
610 | } | |
611 | ||
96ae923a GR |
612 | INIT_LIST_HEAD(&cinfo->suspend_list); |
613 | spin_lock_init(&cinfo->suspend_lock); | |
614 | ||
615 | ret = gather_all_resync_info(mddev, nodes); | |
616 | if (ret) | |
617 | goto err; | |
618 | ||
edb39c9d | 619 | return 0; |
c4ce867f | 620 | err: |
4664680c GR |
621 | lockres_free(cinfo->message_lockres); |
622 | lockres_free(cinfo->token_lockres); | |
623 | lockres_free(cinfo->ack_lockres); | |
96ae923a GR |
624 | lockres_free(cinfo->bitmap_lockres); |
625 | lockres_free(cinfo->sb_lock); | |
c4ce867f GR |
626 | if (cinfo->lockspace) |
627 | dlm_release_lockspace(cinfo->lockspace, 2); | |
cf921cc1 | 628 | mddev->cluster_info = NULL; |
c4ce867f GR |
629 | kfree(cinfo); |
630 | module_put(THIS_MODULE); | |
631 | return ret; | |
edb39c9d GR |
632 | } |
633 | ||
634 | static int leave(struct mddev *mddev) | |
635 | { | |
c4ce867f GR |
636 | struct md_cluster_info *cinfo = mddev->cluster_info; |
637 | ||
638 | if (!cinfo) | |
639 | return 0; | |
e94987db | 640 | md_unregister_thread(&cinfo->recovery_thread); |
4664680c GR |
641 | md_unregister_thread(&cinfo->recv_thread); |
642 | lockres_free(cinfo->message_lockres); | |
643 | lockres_free(cinfo->token_lockres); | |
644 | lockres_free(cinfo->ack_lockres); | |
c4ce867f | 645 | lockres_free(cinfo->sb_lock); |
54519c5f | 646 | lockres_free(cinfo->bitmap_lockres); |
c4ce867f | 647 | dlm_release_lockspace(cinfo->lockspace, 2); |
edb39c9d GR |
648 | return 0; |
649 | } | |
650 | ||
cf921cc1 GR |
651 | /* slot_number(): Returns the MD slot number to use |
652 | * DLM starts the slot numbers from 1, wheras cluster-md | |
653 | * wants the number to be from zero, so we deduct one | |
654 | */ | |
655 | static int slot_number(struct mddev *mddev) | |
656 | { | |
657 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
658 | ||
659 | return cinfo->slot_number - 1; | |
660 | } | |
661 | ||
96ae923a GR |
662 | static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) |
663 | { | |
664 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
665 | ||
666 | add_resync_info(mddev, cinfo->bitmap_lockres, lo, hi); | |
667 | /* Re-acquire the lock to refresh LVB */ | |
668 | dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); | |
669 | } | |
670 | ||
293467aa GR |
671 | static int metadata_update_start(struct mddev *mddev) |
672 | { | |
673 | return lock_comm(mddev->cluster_info); | |
674 | } | |
675 | ||
676 | static int metadata_update_finish(struct mddev *mddev) | |
677 | { | |
678 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
679 | struct cluster_msg cmsg; | |
680 | int ret; | |
681 | ||
682 | memset(&cmsg, 0, sizeof(cmsg)); | |
683 | cmsg.type = cpu_to_le32(METADATA_UPDATED); | |
684 | ret = __sendmsg(cinfo, &cmsg); | |
685 | unlock_comm(cinfo); | |
686 | return ret; | |
687 | } | |
688 | ||
689 | static int metadata_update_cancel(struct mddev *mddev) | |
690 | { | |
691 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
692 | ||
693 | return dlm_unlock_sync(cinfo->token_lockres); | |
694 | } | |
695 | ||
965400eb GR |
696 | static int resync_send(struct mddev *mddev, enum msg_type type, |
697 | sector_t lo, sector_t hi) | |
698 | { | |
699 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
700 | struct cluster_msg cmsg; | |
701 | int slot = cinfo->slot_number - 1; | |
702 | ||
703 | pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__, | |
704 | (unsigned long long)lo, | |
705 | (unsigned long long)hi); | |
706 | resync_info_update(mddev, lo, hi); | |
707 | cmsg.type = cpu_to_le32(type); | |
708 | cmsg.slot = cpu_to_le32(slot); | |
709 | cmsg.low = cpu_to_le64(lo); | |
710 | cmsg.high = cpu_to_le64(hi); | |
711 | return sendmsg(cinfo, &cmsg); | |
712 | } | |
713 | ||
714 | static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi) | |
715 | { | |
716 | pr_info("%s:%d\n", __func__, __LINE__); | |
717 | return resync_send(mddev, RESYNCING, lo, hi); | |
718 | } | |
719 | ||
720 | static void resync_finish(struct mddev *mddev) | |
721 | { | |
722 | pr_info("%s:%d\n", __func__, __LINE__); | |
723 | resync_send(mddev, RESYNCING, 0, 0); | |
724 | } | |
725 | ||
edb39c9d GR |
726 | static struct md_cluster_operations cluster_ops = { |
727 | .join = join, | |
728 | .leave = leave, | |
cf921cc1 | 729 | .slot_number = slot_number, |
96ae923a | 730 | .resync_info_update = resync_info_update, |
965400eb GR |
731 | .resync_start = resync_start, |
732 | .resync_finish = resync_finish, | |
293467aa GR |
733 | .metadata_update_start = metadata_update_start, |
734 | .metadata_update_finish = metadata_update_finish, | |
735 | .metadata_update_cancel = metadata_update_cancel, | |
edb39c9d GR |
736 | }; |
737 | ||
8e854e9c GR |
738 | static int __init cluster_init(void) |
739 | { | |
740 | pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n"); | |
741 | pr_info("Registering Cluster MD functions\n"); | |
edb39c9d | 742 | register_md_cluster_operations(&cluster_ops, THIS_MODULE); |
8e854e9c GR |
743 | return 0; |
744 | } | |
745 | ||
746 | static void cluster_exit(void) | |
747 | { | |
edb39c9d | 748 | unregister_md_cluster_operations(); |
8e854e9c GR |
749 | } |
750 | ||
751 | module_init(cluster_init); | |
752 | module_exit(cluster_exit); | |
753 | MODULE_LICENSE("GPL"); | |
754 | MODULE_DESCRIPTION("Clustering support for MD"); |