Commit | Line | Data |
---|---|---|
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> | |
1aee41f6 | 15 | #include <linux/raid/md_p.h> |
47741b7c | 16 | #include "md.h" |
e94987db | 17 | #include "bitmap.h" |
edb39c9d | 18 | #include "md-cluster.h" |
47741b7c GR |
19 | |
20 | #define LVB_SIZE 64 | |
1aee41f6 | 21 | #define NEW_DEV_TIMEOUT 5000 |
47741b7c GR |
22 | |
23 | struct dlm_lock_resource { | |
24 | dlm_lockspace_t *ls; | |
25 | struct dlm_lksb lksb; | |
26 | char *name; /* lock name. */ | |
27 | uint32_t flags; /* flags to pass to dlm_lock() */ | |
47741b7c | 28 | struct completion completion; /* completion for synchronized locking */ |
c4ce867f GR |
29 | void (*bast)(void *arg, int mode); /* blocking AST function pointer*/ |
30 | struct mddev *mddev; /* pointing back to mddev. */ | |
31 | }; | |
32 | ||
96ae923a GR |
33 | struct suspend_info { |
34 | int slot; | |
35 | sector_t lo; | |
36 | sector_t hi; | |
37 | struct list_head list; | |
38 | }; | |
39 | ||
40 | struct resync_info { | |
41 | __le64 lo; | |
42 | __le64 hi; | |
43 | }; | |
44 | ||
fa8259da GR |
45 | /* md_cluster_info flags */ |
46 | #define MD_CLUSTER_WAITING_FOR_NEWDISK 1 | |
90382ed9 | 47 | #define MD_CLUSTER_SUSPEND_READ_BALANCING 2 |
fa8259da GR |
48 | |
49 | ||
c4ce867f GR |
50 | struct md_cluster_info { |
51 | /* dlm lock space and resources for clustered raid. */ | |
52 | dlm_lockspace_t *lockspace; | |
cf921cc1 GR |
53 | int slot_number; |
54 | struct completion completion; | |
c4ce867f GR |
55 | struct dlm_lock_resource *sb_lock; |
56 | struct mutex sb_mutex; | |
54519c5f | 57 | struct dlm_lock_resource *bitmap_lockres; |
96ae923a GR |
58 | struct list_head suspend_list; |
59 | spinlock_t suspend_lock; | |
e94987db GR |
60 | struct md_thread *recovery_thread; |
61 | unsigned long recovery_map; | |
4664680c GR |
62 | /* communication loc resources */ |
63 | struct dlm_lock_resource *ack_lockres; | |
64 | struct dlm_lock_resource *message_lockres; | |
65 | struct dlm_lock_resource *token_lockres; | |
1aee41f6 | 66 | struct dlm_lock_resource *no_new_dev_lockres; |
4664680c | 67 | struct md_thread *recv_thread; |
1aee41f6 | 68 | struct completion newdisk_completion; |
fa8259da | 69 | unsigned long state; |
4664680c GR |
70 | }; |
71 | ||
72 | enum msg_type { | |
73 | METADATA_UPDATED = 0, | |
74 | RESYNCING, | |
1aee41f6 | 75 | NEWDISK, |
88bcfef7 | 76 | REMOVE, |
97f6cd39 | 77 | RE_ADD, |
4664680c GR |
78 | }; |
79 | ||
80 | struct cluster_msg { | |
81 | int type; | |
82 | int slot; | |
1aee41f6 | 83 | /* TODO: Unionize this for smaller footprint */ |
4664680c GR |
84 | sector_t low; |
85 | sector_t high; | |
1aee41f6 GR |
86 | char uuid[16]; |
87 | int raid_slot; | |
47741b7c GR |
88 | }; |
89 | ||
90 | static void sync_ast(void *arg) | |
91 | { | |
92 | struct dlm_lock_resource *res; | |
93 | ||
94 | res = (struct dlm_lock_resource *) arg; | |
95 | complete(&res->completion); | |
96 | } | |
97 | ||
98 | static int dlm_lock_sync(struct dlm_lock_resource *res, int mode) | |
99 | { | |
100 | int ret = 0; | |
101 | ||
102 | init_completion(&res->completion); | |
103 | ret = dlm_lock(res->ls, mode, &res->lksb, | |
104 | res->flags, res->name, strlen(res->name), | |
105 | 0, sync_ast, res, res->bast); | |
106 | if (ret) | |
107 | return ret; | |
108 | wait_for_completion(&res->completion); | |
109 | return res->lksb.sb_status; | |
110 | } | |
111 | ||
112 | static int dlm_unlock_sync(struct dlm_lock_resource *res) | |
113 | { | |
114 | return dlm_lock_sync(res, DLM_LOCK_NL); | |
115 | } | |
116 | ||
c4ce867f | 117 | static struct dlm_lock_resource *lockres_init(struct mddev *mddev, |
47741b7c GR |
118 | char *name, void (*bastfn)(void *arg, int mode), int with_lvb) |
119 | { | |
120 | struct dlm_lock_resource *res = NULL; | |
121 | int ret, namelen; | |
c4ce867f | 122 | struct md_cluster_info *cinfo = mddev->cluster_info; |
47741b7c GR |
123 | |
124 | res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL); | |
125 | if (!res) | |
126 | return NULL; | |
c4ce867f GR |
127 | res->ls = cinfo->lockspace; |
128 | res->mddev = mddev; | |
47741b7c GR |
129 | namelen = strlen(name); |
130 | res->name = kzalloc(namelen + 1, GFP_KERNEL); | |
131 | if (!res->name) { | |
132 | pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name); | |
133 | goto out_err; | |
134 | } | |
135 | strlcpy(res->name, name, namelen + 1); | |
136 | if (with_lvb) { | |
137 | res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL); | |
138 | if (!res->lksb.sb_lvbptr) { | |
139 | pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name); | |
140 | goto out_err; | |
141 | } | |
142 | res->flags = DLM_LKF_VALBLK; | |
143 | } | |
144 | ||
145 | if (bastfn) | |
146 | res->bast = bastfn; | |
147 | ||
148 | res->flags |= DLM_LKF_EXPEDITE; | |
149 | ||
150 | ret = dlm_lock_sync(res, DLM_LOCK_NL); | |
151 | if (ret) { | |
152 | pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name); | |
153 | goto out_err; | |
154 | } | |
155 | res->flags &= ~DLM_LKF_EXPEDITE; | |
156 | res->flags |= DLM_LKF_CONVERT; | |
157 | ||
158 | return res; | |
159 | out_err: | |
160 | kfree(res->lksb.sb_lvbptr); | |
161 | kfree(res->name); | |
162 | kfree(res); | |
163 | return NULL; | |
164 | } | |
165 | ||
166 | static void lockres_free(struct dlm_lock_resource *res) | |
167 | { | |
168 | if (!res) | |
169 | return; | |
170 | ||
171 | init_completion(&res->completion); | |
172 | dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res); | |
173 | wait_for_completion(&res->completion); | |
174 | ||
175 | kfree(res->name); | |
176 | kfree(res->lksb.sb_lvbptr); | |
177 | kfree(res); | |
178 | } | |
8e854e9c | 179 | |
c4ce867f GR |
180 | static char *pretty_uuid(char *dest, char *src) |
181 | { | |
182 | int i, len = 0; | |
183 | ||
184 | for (i = 0; i < 16; i++) { | |
185 | if (i == 4 || i == 6 || i == 8 || i == 10) | |
186 | len += sprintf(dest + len, "-"); | |
187 | len += sprintf(dest + len, "%02x", (__u8)src[i]); | |
188 | } | |
189 | return dest; | |
190 | } | |
191 | ||
96ae923a GR |
192 | static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres, |
193 | sector_t lo, sector_t hi) | |
194 | { | |
195 | struct resync_info *ri; | |
196 | ||
197 | ri = (struct resync_info *)lockres->lksb.sb_lvbptr; | |
198 | ri->lo = cpu_to_le64(lo); | |
199 | ri->hi = cpu_to_le64(hi); | |
200 | } | |
201 | ||
202 | static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres) | |
203 | { | |
204 | struct resync_info ri; | |
205 | struct suspend_info *s = NULL; | |
206 | sector_t hi = 0; | |
207 | ||
208 | dlm_lock_sync(lockres, DLM_LOCK_CR); | |
209 | memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info)); | |
210 | hi = le64_to_cpu(ri.hi); | |
211 | if (ri.hi > 0) { | |
212 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); | |
213 | if (!s) | |
214 | goto out; | |
215 | s->hi = hi; | |
216 | s->lo = le64_to_cpu(ri.lo); | |
217 | } | |
218 | dlm_unlock_sync(lockres); | |
219 | out: | |
220 | return s; | |
221 | } | |
222 | ||
6dc69c9c | 223 | static void recover_bitmaps(struct md_thread *thread) |
e94987db GR |
224 | { |
225 | struct mddev *mddev = thread->mddev; | |
226 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
227 | struct dlm_lock_resource *bm_lockres; | |
228 | char str[64]; | |
229 | int slot, ret; | |
230 | struct suspend_info *s, *tmp; | |
231 | sector_t lo, hi; | |
232 | ||
233 | while (cinfo->recovery_map) { | |
234 | slot = fls64((u64)cinfo->recovery_map) - 1; | |
235 | ||
236 | /* Clear suspend_area associated with the bitmap */ | |
237 | spin_lock_irq(&cinfo->suspend_lock); | |
238 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
239 | if (slot == s->slot) { | |
240 | list_del(&s->list); | |
241 | kfree(s); | |
242 | } | |
243 | spin_unlock_irq(&cinfo->suspend_lock); | |
244 | ||
245 | snprintf(str, 64, "bitmap%04d", slot); | |
246 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
247 | if (!bm_lockres) { | |
248 | pr_err("md-cluster: Cannot initialize bitmaps\n"); | |
249 | goto clear_bit; | |
250 | } | |
251 | ||
252 | ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
253 | if (ret) { | |
254 | pr_err("md-cluster: Could not DLM lock %s: %d\n", | |
255 | str, ret); | |
256 | goto clear_bit; | |
257 | } | |
97f6cd39 | 258 | ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true); |
4b26a08a | 259 | if (ret) { |
e94987db | 260 | pr_err("md-cluster: Could not copy data from bitmap %d\n", slot); |
4b26a08a GR |
261 | goto dlm_unlock; |
262 | } | |
263 | if (hi > 0) { | |
264 | /* TODO:Wait for current resync to get over */ | |
265 | set_bit(MD_RECOVERY_NEEDED, &mddev->recovery); | |
266 | if (lo < mddev->recovery_cp) | |
267 | mddev->recovery_cp = lo; | |
268 | md_check_recovery(mddev); | |
269 | } | |
270 | dlm_unlock: | |
e94987db GR |
271 | dlm_unlock_sync(bm_lockres); |
272 | clear_bit: | |
273 | clear_bit(slot, &cinfo->recovery_map); | |
274 | } | |
275 | } | |
276 | ||
cf921cc1 GR |
277 | static void recover_prep(void *arg) |
278 | { | |
90382ed9 GR |
279 | struct mddev *mddev = arg; |
280 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
281 | set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); | |
cf921cc1 GR |
282 | } |
283 | ||
284 | static void recover_slot(void *arg, struct dlm_slot *slot) | |
285 | { | |
286 | struct mddev *mddev = arg; | |
287 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
288 | ||
289 | pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n", | |
290 | mddev->bitmap_info.cluster_name, | |
291 | slot->nodeid, slot->slot, | |
292 | cinfo->slot_number); | |
e94987db GR |
293 | set_bit(slot->slot - 1, &cinfo->recovery_map); |
294 | if (!cinfo->recovery_thread) { | |
295 | cinfo->recovery_thread = md_register_thread(recover_bitmaps, | |
296 | mddev, "recover"); | |
297 | if (!cinfo->recovery_thread) { | |
298 | pr_warn("md-cluster: Could not create recovery thread\n"); | |
299 | return; | |
300 | } | |
301 | } | |
302 | md_wakeup_thread(cinfo->recovery_thread); | |
cf921cc1 GR |
303 | } |
304 | ||
305 | static void recover_done(void *arg, struct dlm_slot *slots, | |
306 | int num_slots, int our_slot, | |
307 | uint32_t generation) | |
308 | { | |
309 | struct mddev *mddev = arg; | |
310 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
311 | ||
312 | cinfo->slot_number = our_slot; | |
313 | complete(&cinfo->completion); | |
90382ed9 | 314 | clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state); |
cf921cc1 GR |
315 | } |
316 | ||
317 | static const struct dlm_lockspace_ops md_ls_ops = { | |
318 | .recover_prep = recover_prep, | |
319 | .recover_slot = recover_slot, | |
320 | .recover_done = recover_done, | |
321 | }; | |
322 | ||
4664680c GR |
323 | /* |
324 | * The BAST function for the ack lock resource | |
325 | * This function wakes up the receive thread in | |
326 | * order to receive and process the message. | |
327 | */ | |
328 | static void ack_bast(void *arg, int mode) | |
329 | { | |
330 | struct dlm_lock_resource *res = (struct dlm_lock_resource *)arg; | |
331 | struct md_cluster_info *cinfo = res->mddev->cluster_info; | |
332 | ||
333 | if (mode == DLM_LOCK_EX) | |
334 | md_wakeup_thread(cinfo->recv_thread); | |
335 | } | |
336 | ||
e59721cc GR |
337 | static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot) |
338 | { | |
339 | struct suspend_info *s, *tmp; | |
340 | ||
341 | list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list) | |
342 | if (slot == s->slot) { | |
343 | pr_info("%s:%d Deleting suspend_info: %d\n", | |
344 | __func__, __LINE__, slot); | |
345 | list_del(&s->list); | |
346 | kfree(s); | |
347 | break; | |
348 | } | |
349 | } | |
350 | ||
351 | static void remove_suspend_info(struct md_cluster_info *cinfo, int slot) | |
352 | { | |
353 | spin_lock_irq(&cinfo->suspend_lock); | |
354 | __remove_suspend_info(cinfo, slot); | |
355 | spin_unlock_irq(&cinfo->suspend_lock); | |
356 | } | |
357 | ||
358 | ||
359 | static void process_suspend_info(struct md_cluster_info *cinfo, | |
360 | int slot, sector_t lo, sector_t hi) | |
361 | { | |
362 | struct suspend_info *s; | |
363 | ||
364 | if (!hi) { | |
365 | remove_suspend_info(cinfo, slot); | |
366 | return; | |
367 | } | |
368 | s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL); | |
369 | if (!s) | |
370 | return; | |
371 | s->slot = slot; | |
372 | s->lo = lo; | |
373 | s->hi = hi; | |
374 | spin_lock_irq(&cinfo->suspend_lock); | |
375 | /* Remove existing entry (if exists) before adding */ | |
376 | __remove_suspend_info(cinfo, slot); | |
377 | list_add(&s->list, &cinfo->suspend_list); | |
378 | spin_unlock_irq(&cinfo->suspend_lock); | |
379 | } | |
380 | ||
1aee41f6 GR |
381 | static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg) |
382 | { | |
383 | char disk_uuid[64]; | |
384 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
385 | char event_name[] = "EVENT=ADD_DEVICE"; | |
386 | char raid_slot[16]; | |
387 | char *envp[] = {event_name, disk_uuid, raid_slot, NULL}; | |
388 | int len; | |
389 | ||
390 | len = snprintf(disk_uuid, 64, "DEVICE_UUID="); | |
391 | pretty_uuid(disk_uuid + len, cmsg->uuid); | |
392 | snprintf(raid_slot, 16, "RAID_DISK=%d", cmsg->raid_slot); | |
393 | pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot); | |
394 | init_completion(&cinfo->newdisk_completion); | |
fa8259da | 395 | set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
1aee41f6 GR |
396 | kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp); |
397 | wait_for_completion_timeout(&cinfo->newdisk_completion, | |
398 | NEW_DEV_TIMEOUT); | |
fa8259da | 399 | clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state); |
1aee41f6 GR |
400 | } |
401 | ||
402 | ||
403 | static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg) | |
404 | { | |
405 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
406 | ||
407 | md_reload_sb(mddev); | |
408 | dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); | |
409 | } | |
410 | ||
88bcfef7 GR |
411 | static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg) |
412 | { | |
413 | struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot); | |
414 | ||
415 | if (rdev) | |
416 | md_kick_rdev_from_array(rdev); | |
417 | else | |
418 | pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", __func__, __LINE__, msg->raid_slot); | |
419 | } | |
420 | ||
97f6cd39 GR |
421 | static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg) |
422 | { | |
423 | struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot); | |
424 | ||
425 | if (rdev && test_bit(Faulty, &rdev->flags)) | |
426 | clear_bit(Faulty, &rdev->flags); | |
427 | else | |
428 | pr_warn("%s: %d Could not find disk(%d) which is faulty", __func__, __LINE__, msg->raid_slot); | |
429 | } | |
430 | ||
4664680c GR |
431 | static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg) |
432 | { | |
433 | switch (msg->type) { | |
434 | case METADATA_UPDATED: | |
435 | pr_info("%s: %d Received message: METADATA_UPDATE from %d\n", | |
436 | __func__, __LINE__, msg->slot); | |
1aee41f6 | 437 | process_metadata_update(mddev, msg); |
4664680c GR |
438 | break; |
439 | case RESYNCING: | |
440 | pr_info("%s: %d Received message: RESYNCING from %d\n", | |
441 | __func__, __LINE__, msg->slot); | |
e59721cc GR |
442 | process_suspend_info(mddev->cluster_info, msg->slot, |
443 | msg->low, msg->high); | |
4664680c | 444 | break; |
1aee41f6 GR |
445 | case NEWDISK: |
446 | pr_info("%s: %d Received message: NEWDISK from %d\n", | |
447 | __func__, __LINE__, msg->slot); | |
448 | process_add_new_disk(mddev, msg); | |
88bcfef7 GR |
449 | break; |
450 | case REMOVE: | |
451 | pr_info("%s: %d Received REMOVE from %d\n", | |
452 | __func__, __LINE__, msg->slot); | |
453 | process_remove_disk(mddev, msg); | |
454 | break; | |
97f6cd39 GR |
455 | case RE_ADD: |
456 | pr_info("%s: %d Received RE_ADD from %d\n", | |
457 | __func__, __LINE__, msg->slot); | |
458 | process_readd_disk(mddev, msg); | |
459 | break; | |
88bcfef7 GR |
460 | default: |
461 | pr_warn("%s:%d Received unknown message from %d\n", | |
462 | __func__, __LINE__, msg->slot); | |
09dd1af2 | 463 | } |
4664680c GR |
464 | } |
465 | ||
466 | /* | |
467 | * thread for receiving message | |
468 | */ | |
469 | static void recv_daemon(struct md_thread *thread) | |
470 | { | |
471 | struct md_cluster_info *cinfo = thread->mddev->cluster_info; | |
472 | struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres; | |
473 | struct dlm_lock_resource *message_lockres = cinfo->message_lockres; | |
474 | struct cluster_msg msg; | |
475 | ||
476 | /*get CR on Message*/ | |
477 | if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) { | |
478 | pr_err("md/raid1:failed to get CR on MESSAGE\n"); | |
479 | return; | |
480 | } | |
481 | ||
482 | /* read lvb and wake up thread to process this message_lockres */ | |
483 | memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg)); | |
484 | process_recvd_msg(thread->mddev, &msg); | |
485 | ||
486 | /*release CR on ack_lockres*/ | |
487 | dlm_unlock_sync(ack_lockres); | |
488 | /*up-convert to EX on message_lockres*/ | |
489 | dlm_lock_sync(message_lockres, DLM_LOCK_EX); | |
490 | /*get CR on ack_lockres again*/ | |
491 | dlm_lock_sync(ack_lockres, DLM_LOCK_CR); | |
492 | /*release CR on message_lockres*/ | |
493 | dlm_unlock_sync(message_lockres); | |
494 | } | |
495 | ||
601b515c GR |
496 | /* lock_comm() |
497 | * Takes the lock on the TOKEN lock resource so no other | |
498 | * node can communicate while the operation is underway. | |
499 | */ | |
500 | static int lock_comm(struct md_cluster_info *cinfo) | |
501 | { | |
502 | int error; | |
503 | ||
504 | error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX); | |
505 | if (error) | |
506 | pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n", | |
507 | __func__, __LINE__, error); | |
508 | return error; | |
509 | } | |
510 | ||
511 | static void unlock_comm(struct md_cluster_info *cinfo) | |
512 | { | |
513 | dlm_unlock_sync(cinfo->token_lockres); | |
514 | } | |
515 | ||
516 | /* __sendmsg() | |
517 | * This function performs the actual sending of the message. This function is | |
518 | * usually called after performing the encompassing operation | |
519 | * The function: | |
520 | * 1. Grabs the message lockresource in EX mode | |
521 | * 2. Copies the message to the message LVB | |
522 | * 3. Downconverts message lockresource to CR | |
523 | * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes | |
524 | * and the other nodes read the message. The thread will wait here until all other | |
525 | * nodes have released ack lock resource. | |
526 | * 5. Downconvert ack lockresource to CR | |
527 | */ | |
528 | static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) | |
529 | { | |
530 | int error; | |
531 | int slot = cinfo->slot_number - 1; | |
532 | ||
533 | cmsg->slot = cpu_to_le32(slot); | |
534 | /*get EX on Message*/ | |
535 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX); | |
536 | if (error) { | |
537 | pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error); | |
538 | goto failed_message; | |
539 | } | |
540 | ||
541 | memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg, | |
542 | sizeof(struct cluster_msg)); | |
543 | /*down-convert EX to CR on Message*/ | |
544 | error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CR); | |
545 | if (error) { | |
546 | pr_err("md-cluster: failed to convert EX to CR on MESSAGE(%d)\n", | |
547 | error); | |
548 | goto failed_message; | |
549 | } | |
550 | ||
551 | /*up-convert CR to EX on Ack*/ | |
552 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX); | |
553 | if (error) { | |
554 | pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n", | |
555 | error); | |
556 | goto failed_ack; | |
557 | } | |
558 | ||
559 | /*down-convert EX to CR on Ack*/ | |
560 | error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR); | |
561 | if (error) { | |
562 | pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n", | |
563 | error); | |
564 | goto failed_ack; | |
565 | } | |
566 | ||
567 | failed_ack: | |
568 | dlm_unlock_sync(cinfo->message_lockres); | |
569 | failed_message: | |
570 | return error; | |
571 | } | |
572 | ||
573 | static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg) | |
574 | { | |
575 | int ret; | |
576 | ||
577 | lock_comm(cinfo); | |
578 | ret = __sendmsg(cinfo, cmsg); | |
579 | unlock_comm(cinfo); | |
580 | return ret; | |
581 | } | |
582 | ||
96ae923a GR |
583 | static int gather_all_resync_info(struct mddev *mddev, int total_slots) |
584 | { | |
585 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
586 | int i, ret = 0; | |
587 | struct dlm_lock_resource *bm_lockres; | |
588 | struct suspend_info *s; | |
589 | char str[64]; | |
590 | ||
591 | ||
592 | for (i = 0; i < total_slots; i++) { | |
593 | memset(str, '\0', 64); | |
594 | snprintf(str, 64, "bitmap%04d", i); | |
595 | bm_lockres = lockres_init(mddev, str, NULL, 1); | |
596 | if (!bm_lockres) | |
597 | return -ENOMEM; | |
598 | if (i == (cinfo->slot_number - 1)) | |
599 | continue; | |
600 | ||
601 | bm_lockres->flags |= DLM_LKF_NOQUEUE; | |
602 | ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW); | |
603 | if (ret == -EAGAIN) { | |
604 | memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE); | |
605 | s = read_resync_info(mddev, bm_lockres); | |
606 | if (s) { | |
607 | pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n", | |
608 | __func__, __LINE__, | |
609 | (unsigned long long) s->lo, | |
610 | (unsigned long long) s->hi, i); | |
611 | spin_lock_irq(&cinfo->suspend_lock); | |
612 | s->slot = i; | |
613 | list_add(&s->list, &cinfo->suspend_list); | |
614 | spin_unlock_irq(&cinfo->suspend_lock); | |
615 | } | |
616 | ret = 0; | |
617 | lockres_free(bm_lockres); | |
618 | continue; | |
619 | } | |
620 | if (ret) | |
621 | goto out; | |
622 | /* TODO: Read the disk bitmap sb and check if it needs recovery */ | |
623 | dlm_unlock_sync(bm_lockres); | |
624 | lockres_free(bm_lockres); | |
625 | } | |
626 | out: | |
627 | return ret; | |
628 | } | |
629 | ||
edb39c9d GR |
630 | static int join(struct mddev *mddev, int nodes) |
631 | { | |
c4ce867f | 632 | struct md_cluster_info *cinfo; |
cf921cc1 | 633 | int ret, ops_rv; |
c4ce867f GR |
634 | char str[64]; |
635 | ||
636 | if (!try_module_get(THIS_MODULE)) | |
637 | return -ENOENT; | |
638 | ||
639 | cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL); | |
640 | if (!cinfo) | |
641 | return -ENOMEM; | |
642 | ||
cf921cc1 GR |
643 | init_completion(&cinfo->completion); |
644 | ||
645 | mutex_init(&cinfo->sb_mutex); | |
646 | mddev->cluster_info = cinfo; | |
647 | ||
c4ce867f GR |
648 | memset(str, 0, 64); |
649 | pretty_uuid(str, mddev->uuid); | |
cf921cc1 GR |
650 | ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name, |
651 | DLM_LSFL_FS, LVB_SIZE, | |
652 | &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace); | |
c4ce867f GR |
653 | if (ret) |
654 | goto err; | |
cf921cc1 | 655 | wait_for_completion(&cinfo->completion); |
8c58f02e GJ |
656 | if (nodes < cinfo->slot_number) { |
657 | pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).", | |
658 | cinfo->slot_number, nodes); | |
b97e9257 GR |
659 | ret = -ERANGE; |
660 | goto err; | |
661 | } | |
c4ce867f GR |
662 | cinfo->sb_lock = lockres_init(mddev, "cmd-super", |
663 | NULL, 0); | |
664 | if (!cinfo->sb_lock) { | |
665 | ret = -ENOMEM; | |
666 | goto err; | |
667 | } | |
4664680c GR |
668 | /* Initiate the communication resources */ |
669 | ret = -ENOMEM; | |
670 | cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv"); | |
671 | if (!cinfo->recv_thread) { | |
672 | pr_err("md-cluster: cannot allocate memory for recv_thread!\n"); | |
673 | goto err; | |
674 | } | |
675 | cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1); | |
676 | if (!cinfo->message_lockres) | |
677 | goto err; | |
678 | cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0); | |
679 | if (!cinfo->token_lockres) | |
680 | goto err; | |
681 | cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0); | |
682 | if (!cinfo->ack_lockres) | |
683 | goto err; | |
1aee41f6 GR |
684 | cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0); |
685 | if (!cinfo->no_new_dev_lockres) | |
686 | goto err; | |
687 | ||
4664680c GR |
688 | /* get sync CR lock on ACK. */ |
689 | if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR)) | |
690 | pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n", | |
691 | ret); | |
1aee41f6 GR |
692 | /* get sync CR lock on no-new-dev. */ |
693 | if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR)) | |
694 | pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret); | |
695 | ||
54519c5f GR |
696 | |
697 | pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number); | |
698 | snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1); | |
699 | cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1); | |
700 | if (!cinfo->bitmap_lockres) | |
701 | goto err; | |
702 | if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) { | |
703 | pr_err("Failed to get bitmap lock\n"); | |
704 | ret = -EINVAL; | |
705 | goto err; | |
706 | } | |
707 | ||
96ae923a GR |
708 | INIT_LIST_HEAD(&cinfo->suspend_list); |
709 | spin_lock_init(&cinfo->suspend_lock); | |
710 | ||
711 | ret = gather_all_resync_info(mddev, nodes); | |
712 | if (ret) | |
713 | goto err; | |
714 | ||
edb39c9d | 715 | return 0; |
c4ce867f | 716 | err: |
4664680c GR |
717 | lockres_free(cinfo->message_lockres); |
718 | lockres_free(cinfo->token_lockres); | |
719 | lockres_free(cinfo->ack_lockres); | |
1aee41f6 | 720 | lockres_free(cinfo->no_new_dev_lockres); |
96ae923a GR |
721 | lockres_free(cinfo->bitmap_lockres); |
722 | lockres_free(cinfo->sb_lock); | |
c4ce867f GR |
723 | if (cinfo->lockspace) |
724 | dlm_release_lockspace(cinfo->lockspace, 2); | |
cf921cc1 | 725 | mddev->cluster_info = NULL; |
c4ce867f GR |
726 | kfree(cinfo); |
727 | module_put(THIS_MODULE); | |
728 | return ret; | |
edb39c9d GR |
729 | } |
730 | ||
731 | static int leave(struct mddev *mddev) | |
732 | { | |
c4ce867f GR |
733 | struct md_cluster_info *cinfo = mddev->cluster_info; |
734 | ||
735 | if (!cinfo) | |
736 | return 0; | |
e94987db | 737 | md_unregister_thread(&cinfo->recovery_thread); |
4664680c GR |
738 | md_unregister_thread(&cinfo->recv_thread); |
739 | lockres_free(cinfo->message_lockres); | |
740 | lockres_free(cinfo->token_lockres); | |
741 | lockres_free(cinfo->ack_lockres); | |
1aee41f6 | 742 | lockres_free(cinfo->no_new_dev_lockres); |
c4ce867f | 743 | lockres_free(cinfo->sb_lock); |
54519c5f | 744 | lockres_free(cinfo->bitmap_lockres); |
c4ce867f | 745 | dlm_release_lockspace(cinfo->lockspace, 2); |
edb39c9d GR |
746 | return 0; |
747 | } | |
748 | ||
cf921cc1 GR |
749 | /* slot_number(): Returns the MD slot number to use |
750 | * DLM starts the slot numbers from 1, wheras cluster-md | |
751 | * wants the number to be from zero, so we deduct one | |
752 | */ | |
753 | static int slot_number(struct mddev *mddev) | |
754 | { | |
755 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
756 | ||
757 | return cinfo->slot_number - 1; | |
758 | } | |
759 | ||
96ae923a GR |
760 | static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi) |
761 | { | |
762 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
763 | ||
764 | add_resync_info(mddev, cinfo->bitmap_lockres, lo, hi); | |
765 | /* Re-acquire the lock to refresh LVB */ | |
766 | dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW); | |
767 | } | |
768 | ||
293467aa GR |
769 | static int metadata_update_start(struct mddev *mddev) |
770 | { | |
771 | return lock_comm(mddev->cluster_info); | |
772 | } | |
773 | ||
774 | static int metadata_update_finish(struct mddev *mddev) | |
775 | { | |
776 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
777 | struct cluster_msg cmsg; | |
778 | int ret; | |
779 | ||
780 | memset(&cmsg, 0, sizeof(cmsg)); | |
781 | cmsg.type = cpu_to_le32(METADATA_UPDATED); | |
782 | ret = __sendmsg(cinfo, &cmsg); | |
783 | unlock_comm(cinfo); | |
784 | return ret; | |
785 | } | |
786 | ||
787 | static int metadata_update_cancel(struct mddev *mddev) | |
788 | { | |
789 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
790 | ||
791 | return dlm_unlock_sync(cinfo->token_lockres); | |
792 | } | |
793 | ||
965400eb GR |
794 | static int resync_send(struct mddev *mddev, enum msg_type type, |
795 | sector_t lo, sector_t hi) | |
796 | { | |
797 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
798 | struct cluster_msg cmsg; | |
799 | int slot = cinfo->slot_number - 1; | |
800 | ||
801 | pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__, | |
802 | (unsigned long long)lo, | |
803 | (unsigned long long)hi); | |
804 | resync_info_update(mddev, lo, hi); | |
805 | cmsg.type = cpu_to_le32(type); | |
806 | cmsg.slot = cpu_to_le32(slot); | |
807 | cmsg.low = cpu_to_le64(lo); | |
808 | cmsg.high = cpu_to_le64(hi); | |
809 | return sendmsg(cinfo, &cmsg); | |
810 | } | |
811 | ||
812 | static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi) | |
813 | { | |
814 | pr_info("%s:%d\n", __func__, __LINE__); | |
815 | return resync_send(mddev, RESYNCING, lo, hi); | |
816 | } | |
817 | ||
818 | static void resync_finish(struct mddev *mddev) | |
819 | { | |
820 | pr_info("%s:%d\n", __func__, __LINE__); | |
821 | resync_send(mddev, RESYNCING, 0, 0); | |
822 | } | |
823 | ||
90382ed9 GR |
824 | static int area_resyncing(struct mddev *mddev, int direction, |
825 | sector_t lo, sector_t hi) | |
589a1c49 GR |
826 | { |
827 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
828 | int ret = 0; | |
829 | struct suspend_info *s; | |
830 | ||
90382ed9 GR |
831 | if ((direction == READ) && |
832 | test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state)) | |
833 | return 1; | |
834 | ||
589a1c49 GR |
835 | spin_lock_irq(&cinfo->suspend_lock); |
836 | if (list_empty(&cinfo->suspend_list)) | |
837 | goto out; | |
838 | list_for_each_entry(s, &cinfo->suspend_list, list) | |
839 | if (hi > s->lo && lo < s->hi) { | |
840 | ret = 1; | |
841 | break; | |
842 | } | |
843 | out: | |
844 | spin_unlock_irq(&cinfo->suspend_lock); | |
845 | return ret; | |
846 | } | |
847 | ||
1aee41f6 GR |
848 | static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev) |
849 | { | |
850 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
851 | struct cluster_msg cmsg; | |
852 | int ret = 0; | |
853 | struct mdp_superblock_1 *sb = page_address(rdev->sb_page); | |
854 | char *uuid = sb->device_uuid; | |
855 | ||
856 | memset(&cmsg, 0, sizeof(cmsg)); | |
857 | cmsg.type = cpu_to_le32(NEWDISK); | |
858 | memcpy(cmsg.uuid, uuid, 16); | |
859 | cmsg.raid_slot = rdev->desc_nr; | |
860 | lock_comm(cinfo); | |
861 | ret = __sendmsg(cinfo, &cmsg); | |
862 | if (ret) | |
863 | return ret; | |
864 | cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE; | |
865 | ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX); | |
866 | cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE; | |
867 | /* Some node does not "see" the device */ | |
868 | if (ret == -EAGAIN) | |
869 | ret = -ENOENT; | |
870 | else | |
871 | dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR); | |
872 | return ret; | |
873 | } | |
874 | ||
875 | static int add_new_disk_finish(struct mddev *mddev) | |
876 | { | |
877 | struct cluster_msg cmsg; | |
878 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
879 | int ret; | |
880 | /* Write sb and inform others */ | |
881 | md_update_sb(mddev, 1); | |
882 | cmsg.type = METADATA_UPDATED; | |
883 | ret = __sendmsg(cinfo, &cmsg); | |
884 | unlock_comm(cinfo); | |
885 | return ret; | |
886 | } | |
887 | ||
fa8259da | 888 | static int new_disk_ack(struct mddev *mddev, bool ack) |
1aee41f6 GR |
889 | { |
890 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
891 | ||
fa8259da GR |
892 | if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) { |
893 | pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev)); | |
894 | return -EINVAL; | |
895 | } | |
896 | ||
1aee41f6 GR |
897 | if (ack) |
898 | dlm_unlock_sync(cinfo->no_new_dev_lockres); | |
899 | complete(&cinfo->newdisk_completion); | |
fa8259da | 900 | return 0; |
1aee41f6 GR |
901 | } |
902 | ||
88bcfef7 GR |
903 | static int remove_disk(struct mddev *mddev, struct md_rdev *rdev) |
904 | { | |
905 | struct cluster_msg cmsg; | |
906 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
907 | cmsg.type = REMOVE; | |
908 | cmsg.raid_slot = rdev->desc_nr; | |
909 | return __sendmsg(cinfo, &cmsg); | |
910 | } | |
911 | ||
97f6cd39 GR |
912 | static int gather_bitmaps(struct md_rdev *rdev) |
913 | { | |
914 | int sn, err; | |
915 | sector_t lo, hi; | |
916 | struct cluster_msg cmsg; | |
917 | struct mddev *mddev = rdev->mddev; | |
918 | struct md_cluster_info *cinfo = mddev->cluster_info; | |
919 | ||
920 | cmsg.type = RE_ADD; | |
921 | cmsg.raid_slot = rdev->desc_nr; | |
922 | err = sendmsg(cinfo, &cmsg); | |
923 | if (err) | |
924 | goto out; | |
925 | ||
926 | for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) { | |
927 | if (sn == (cinfo->slot_number - 1)) | |
928 | continue; | |
929 | err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false); | |
930 | if (err) { | |
931 | pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn); | |
932 | goto out; | |
933 | } | |
934 | if ((hi > 0) && (lo < mddev->recovery_cp)) | |
935 | mddev->recovery_cp = lo; | |
936 | } | |
937 | out: | |
938 | return err; | |
939 | } | |
940 | ||
edb39c9d GR |
941 | static struct md_cluster_operations cluster_ops = { |
942 | .join = join, | |
943 | .leave = leave, | |
cf921cc1 | 944 | .slot_number = slot_number, |
96ae923a | 945 | .resync_info_update = resync_info_update, |
965400eb GR |
946 | .resync_start = resync_start, |
947 | .resync_finish = resync_finish, | |
293467aa GR |
948 | .metadata_update_start = metadata_update_start, |
949 | .metadata_update_finish = metadata_update_finish, | |
950 | .metadata_update_cancel = metadata_update_cancel, | |
589a1c49 | 951 | .area_resyncing = area_resyncing, |
1aee41f6 GR |
952 | .add_new_disk_start = add_new_disk_start, |
953 | .add_new_disk_finish = add_new_disk_finish, | |
954 | .new_disk_ack = new_disk_ack, | |
88bcfef7 | 955 | .remove_disk = remove_disk, |
97f6cd39 | 956 | .gather_bitmaps = gather_bitmaps, |
edb39c9d GR |
957 | }; |
958 | ||
8e854e9c GR |
959 | static int __init cluster_init(void) |
960 | { | |
961 | pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n"); | |
962 | pr_info("Registering Cluster MD functions\n"); | |
edb39c9d | 963 | register_md_cluster_operations(&cluster_ops, THIS_MODULE); |
8e854e9c GR |
964 | return 0; |
965 | } | |
966 | ||
967 | static void cluster_exit(void) | |
968 | { | |
edb39c9d | 969 | unregister_md_cluster_operations(); |
8e854e9c GR |
970 | } |
971 | ||
972 | module_init(cluster_init); | |
973 | module_exit(cluster_exit); | |
974 | MODULE_LICENSE("GPL"); | |
975 | MODULE_DESCRIPTION("Clustering support for MD"); |