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