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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>
13#include <linux/dlm.h>
14#include <linux/sched.h>
15#include <linux/raid/md_p.h>
16#include "md.h"
17#include "bitmap.h"
18#include "md-cluster.h"
19
20#define LVB_SIZE 64
21#define NEW_DEV_TIMEOUT 5000
22
23struct 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() */
28 struct completion completion; /* completion for synchronized locking */
29 void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
30 struct mddev *mddev; /* pointing back to mddev. */
31 int mode;
32};
33
34struct suspend_info {
35 int slot;
36 sector_t lo;
37 sector_t hi;
38 struct list_head list;
39};
40
41struct resync_info {
42 __le64 lo;
43 __le64 hi;
44};
45
46/* md_cluster_info flags */
47#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
48#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
49#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
50
51/* Lock the send communication. This is done through
52 * bit manipulation as opposed to a mutex in order to
53 * accomodate lock and hold. See next comment.
54 */
55#define MD_CLUSTER_SEND_LOCK 4
56/* If cluster operations (such as adding a disk) must lock the
57 * communication channel, so as to perform extra operations
58 * (update metadata) and no other operation is allowed on the
59 * MD. Token needs to be locked and held until the operation
60 * completes witha md_update_sb(), which would eventually release
61 * the lock.
62 */
63#define MD_CLUSTER_SEND_LOCKED_ALREADY 5
64
65
66struct md_cluster_info {
67 /* dlm lock space and resources for clustered raid. */
68 dlm_lockspace_t *lockspace;
69 int slot_number;
70 struct completion completion;
71 struct mutex recv_mutex;
72 struct dlm_lock_resource *bitmap_lockres;
73 struct dlm_lock_resource **other_bitmap_lockres;
74 struct dlm_lock_resource *resync_lockres;
75 struct list_head suspend_list;
76 spinlock_t suspend_lock;
77 struct md_thread *recovery_thread;
78 unsigned long recovery_map;
79 /* communication loc resources */
80 struct dlm_lock_resource *ack_lockres;
81 struct dlm_lock_resource *message_lockres;
82 struct dlm_lock_resource *token_lockres;
83 struct dlm_lock_resource *no_new_dev_lockres;
84 struct md_thread *recv_thread;
85 struct completion newdisk_completion;
86 wait_queue_head_t wait;
87 unsigned long state;
88};
89
90enum msg_type {
91 METADATA_UPDATED = 0,
92 RESYNCING,
93 NEWDISK,
94 REMOVE,
95 RE_ADD,
96 BITMAP_NEEDS_SYNC,
97};
98
99struct cluster_msg {
100 __le32 type;
101 __le32 slot;
102 /* TODO: Unionize this for smaller footprint */
103 __le64 low;
104 __le64 high;
105 char uuid[16];
106 __le32 raid_slot;
107};
108
109static void sync_ast(void *arg)
110{
111 struct dlm_lock_resource *res;
112
113 res = arg;
114 complete(&res->completion);
115}
116
117static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
118{
119 int ret = 0;
120
121 ret = dlm_lock(res->ls, mode, &res->lksb,
122 res->flags, res->name, strlen(res->name),
123 0, sync_ast, res, res->bast);
124 if (ret)
125 return ret;
126 wait_for_completion(&res->completion);
127 if (res->lksb.sb_status == 0)
128 res->mode = mode;
129 return res->lksb.sb_status;
130}
131
132static int dlm_unlock_sync(struct dlm_lock_resource *res)
133{
134 return dlm_lock_sync(res, DLM_LOCK_NL);
135}
136
137static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
138 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
139{
140 struct dlm_lock_resource *res = NULL;
141 int ret, namelen;
142 struct md_cluster_info *cinfo = mddev->cluster_info;
143
144 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
145 if (!res)
146 return NULL;
147 init_completion(&res->completion);
148 res->ls = cinfo->lockspace;
149 res->mddev = mddev;
150 res->mode = DLM_LOCK_IV;
151 namelen = strlen(name);
152 res->name = kzalloc(namelen + 1, GFP_KERNEL);
153 if (!res->name) {
154 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
155 goto out_err;
156 }
157 strlcpy(res->name, name, namelen + 1);
158 if (with_lvb) {
159 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
160 if (!res->lksb.sb_lvbptr) {
161 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
162 goto out_err;
163 }
164 res->flags = DLM_LKF_VALBLK;
165 }
166
167 if (bastfn)
168 res->bast = bastfn;
169
170 res->flags |= DLM_LKF_EXPEDITE;
171
172 ret = dlm_lock_sync(res, DLM_LOCK_NL);
173 if (ret) {
174 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
175 goto out_err;
176 }
177 res->flags &= ~DLM_LKF_EXPEDITE;
178 res->flags |= DLM_LKF_CONVERT;
179
180 return res;
181out_err:
182 kfree(res->lksb.sb_lvbptr);
183 kfree(res->name);
184 kfree(res);
185 return NULL;
186}
187
188static void lockres_free(struct dlm_lock_resource *res)
189{
190 int ret;
191
192 if (!res)
193 return;
194
195 /* cancel a lock request or a conversion request that is blocked */
196 res->flags |= DLM_LKF_CANCEL;
197retry:
198 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
199 if (unlikely(ret != 0)) {
200 pr_info("%s: failed to unlock %s return %d\n", __func__, res->name, ret);
201
202 /* if a lock conversion is cancelled, then the lock is put
203 * back to grant queue, need to ensure it is unlocked */
204 if (ret == -DLM_ECANCEL)
205 goto retry;
206 }
207 res->flags &= ~DLM_LKF_CANCEL;
208 wait_for_completion(&res->completion);
209
210 kfree(res->name);
211 kfree(res->lksb.sb_lvbptr);
212 kfree(res);
213}
214
215static void add_resync_info(struct dlm_lock_resource *lockres,
216 sector_t lo, sector_t hi)
217{
218 struct resync_info *ri;
219
220 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
221 ri->lo = cpu_to_le64(lo);
222 ri->hi = cpu_to_le64(hi);
223}
224
225static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
226{
227 struct resync_info ri;
228 struct suspend_info *s = NULL;
229 sector_t hi = 0;
230
231 dlm_lock_sync(lockres, DLM_LOCK_CR);
232 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
233 hi = le64_to_cpu(ri.hi);
234 if (hi > 0) {
235 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
236 if (!s)
237 goto out;
238 s->hi = hi;
239 s->lo = le64_to_cpu(ri.lo);
240 }
241 dlm_unlock_sync(lockres);
242out:
243 return s;
244}
245
246static void recover_bitmaps(struct md_thread *thread)
247{
248 struct mddev *mddev = thread->mddev;
249 struct md_cluster_info *cinfo = mddev->cluster_info;
250 struct dlm_lock_resource *bm_lockres;
251 char str[64];
252 int slot, ret;
253 struct suspend_info *s, *tmp;
254 sector_t lo, hi;
255
256 while (cinfo->recovery_map) {
257 slot = fls64((u64)cinfo->recovery_map) - 1;
258
259 /* Clear suspend_area associated with the bitmap */
260 spin_lock_irq(&cinfo->suspend_lock);
261 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
262 if (slot == s->slot) {
263 list_del(&s->list);
264 kfree(s);
265 }
266 spin_unlock_irq(&cinfo->suspend_lock);
267
268 snprintf(str, 64, "bitmap%04d", slot);
269 bm_lockres = lockres_init(mddev, str, NULL, 1);
270 if (!bm_lockres) {
271 pr_err("md-cluster: Cannot initialize bitmaps\n");
272 goto clear_bit;
273 }
274
275 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
276 if (ret) {
277 pr_err("md-cluster: Could not DLM lock %s: %d\n",
278 str, ret);
279 goto clear_bit;
280 }
281 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
282 if (ret) {
283 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
284 goto dlm_unlock;
285 }
286 if (hi > 0) {
287 /* TODO:Wait for current resync to get over */
288 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
289 if (lo < mddev->recovery_cp)
290 mddev->recovery_cp = lo;
291 md_check_recovery(mddev);
292 }
293dlm_unlock:
294 dlm_unlock_sync(bm_lockres);
295clear_bit:
296 lockres_free(bm_lockres);
297 clear_bit(slot, &cinfo->recovery_map);
298 }
299}
300
301static void recover_prep(void *arg)
302{
303 struct mddev *mddev = arg;
304 struct md_cluster_info *cinfo = mddev->cluster_info;
305 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
306}
307
308static void __recover_slot(struct mddev *mddev, int slot)
309{
310 struct md_cluster_info *cinfo = mddev->cluster_info;
311
312 set_bit(slot, &cinfo->recovery_map);
313 if (!cinfo->recovery_thread) {
314 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
315 mddev, "recover");
316 if (!cinfo->recovery_thread) {
317 pr_warn("md-cluster: Could not create recovery thread\n");
318 return;
319 }
320 }
321 md_wakeup_thread(cinfo->recovery_thread);
322}
323
324static void recover_slot(void *arg, struct dlm_slot *slot)
325{
326 struct mddev *mddev = arg;
327 struct md_cluster_info *cinfo = mddev->cluster_info;
328
329 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
330 mddev->bitmap_info.cluster_name,
331 slot->nodeid, slot->slot,
332 cinfo->slot_number);
333 /* deduct one since dlm slot starts from one while the num of
334 * cluster-md begins with 0 */
335 __recover_slot(mddev, slot->slot - 1);
336}
337
338static void recover_done(void *arg, struct dlm_slot *slots,
339 int num_slots, int our_slot,
340 uint32_t generation)
341{
342 struct mddev *mddev = arg;
343 struct md_cluster_info *cinfo = mddev->cluster_info;
344
345 cinfo->slot_number = our_slot;
346 /* completion is only need to be complete when node join cluster,
347 * it doesn't need to run during another node's failure */
348 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
349 complete(&cinfo->completion);
350 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
351 }
352 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
353}
354
355/* the ops is called when node join the cluster, and do lock recovery
356 * if node failure occurs */
357static const struct dlm_lockspace_ops md_ls_ops = {
358 .recover_prep = recover_prep,
359 .recover_slot = recover_slot,
360 .recover_done = recover_done,
361};
362
363/*
364 * The BAST function for the ack lock resource
365 * This function wakes up the receive thread in
366 * order to receive and process the message.
367 */
368static void ack_bast(void *arg, int mode)
369{
370 struct dlm_lock_resource *res = arg;
371 struct md_cluster_info *cinfo = res->mddev->cluster_info;
372
373 if (mode == DLM_LOCK_EX)
374 md_wakeup_thread(cinfo->recv_thread);
375}
376
377static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
378{
379 struct suspend_info *s, *tmp;
380
381 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
382 if (slot == s->slot) {
383 list_del(&s->list);
384 kfree(s);
385 break;
386 }
387}
388
389static void remove_suspend_info(struct mddev *mddev, int slot)
390{
391 struct md_cluster_info *cinfo = mddev->cluster_info;
392 spin_lock_irq(&cinfo->suspend_lock);
393 __remove_suspend_info(cinfo, slot);
394 spin_unlock_irq(&cinfo->suspend_lock);
395 mddev->pers->quiesce(mddev, 2);
396}
397
398
399static void process_suspend_info(struct mddev *mddev,
400 int slot, sector_t lo, sector_t hi)
401{
402 struct md_cluster_info *cinfo = mddev->cluster_info;
403 struct suspend_info *s;
404
405 if (!hi) {
406 remove_suspend_info(mddev, slot);
407 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
408 md_wakeup_thread(mddev->thread);
409 return;
410 }
411 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
412 if (!s)
413 return;
414 s->slot = slot;
415 s->lo = lo;
416 s->hi = hi;
417 mddev->pers->quiesce(mddev, 1);
418 mddev->pers->quiesce(mddev, 0);
419 spin_lock_irq(&cinfo->suspend_lock);
420 /* Remove existing entry (if exists) before adding */
421 __remove_suspend_info(cinfo, slot);
422 list_add(&s->list, &cinfo->suspend_list);
423 spin_unlock_irq(&cinfo->suspend_lock);
424 mddev->pers->quiesce(mddev, 2);
425}
426
427static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
428{
429 char disk_uuid[64];
430 struct md_cluster_info *cinfo = mddev->cluster_info;
431 char event_name[] = "EVENT=ADD_DEVICE";
432 char raid_slot[16];
433 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
434 int len;
435
436 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
437 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
438 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
439 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
440 init_completion(&cinfo->newdisk_completion);
441 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
442 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
443 wait_for_completion_timeout(&cinfo->newdisk_completion,
444 NEW_DEV_TIMEOUT);
445 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
446}
447
448
449static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
450{
451 struct md_cluster_info *cinfo = mddev->cluster_info;
452 mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
453 set_bit(MD_RELOAD_SB, &mddev->flags);
454 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
455 md_wakeup_thread(mddev->thread);
456}
457
458static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
459{
460 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
461 le32_to_cpu(msg->raid_slot));
462
463 if (rdev) {
464 set_bit(ClusterRemove, &rdev->flags);
465 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
466 md_wakeup_thread(mddev->thread);
467 }
468 else
469 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
470 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
471}
472
473static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
474{
475 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
476 le32_to_cpu(msg->raid_slot));
477
478 if (rdev && test_bit(Faulty, &rdev->flags))
479 clear_bit(Faulty, &rdev->flags);
480 else
481 pr_warn("%s: %d Could not find disk(%d) which is faulty",
482 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
483}
484
485static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
486{
487 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
488 "node %d received it's own msg\n", le32_to_cpu(msg->slot)))
489 return;
490 switch (le32_to_cpu(msg->type)) {
491 case METADATA_UPDATED:
492 process_metadata_update(mddev, msg);
493 break;
494 case RESYNCING:
495 process_suspend_info(mddev, le32_to_cpu(msg->slot),
496 le64_to_cpu(msg->low),
497 le64_to_cpu(msg->high));
498 break;
499 case NEWDISK:
500 process_add_new_disk(mddev, msg);
501 break;
502 case REMOVE:
503 process_remove_disk(mddev, msg);
504 break;
505 case RE_ADD:
506 process_readd_disk(mddev, msg);
507 break;
508 case BITMAP_NEEDS_SYNC:
509 __recover_slot(mddev, le32_to_cpu(msg->slot));
510 break;
511 default:
512 pr_warn("%s:%d Received unknown message from %d\n",
513 __func__, __LINE__, msg->slot);
514 }
515}
516
517/*
518 * thread for receiving message
519 */
520static void recv_daemon(struct md_thread *thread)
521{
522 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
523 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
524 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
525 struct cluster_msg msg;
526 int ret;
527
528 mutex_lock(&cinfo->recv_mutex);
529 /*get CR on Message*/
530 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
531 pr_err("md/raid1:failed to get CR on MESSAGE\n");
532 mutex_unlock(&cinfo->recv_mutex);
533 return;
534 }
535
536 /* read lvb and wake up thread to process this message_lockres */
537 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
538 process_recvd_msg(thread->mddev, &msg);
539
540 /*release CR on ack_lockres*/
541 ret = dlm_unlock_sync(ack_lockres);
542 if (unlikely(ret != 0))
543 pr_info("unlock ack failed return %d\n", ret);
544 /*up-convert to PR on message_lockres*/
545 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
546 if (unlikely(ret != 0))
547 pr_info("lock PR on msg failed return %d\n", ret);
548 /*get CR on ack_lockres again*/
549 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
550 if (unlikely(ret != 0))
551 pr_info("lock CR on ack failed return %d\n", ret);
552 /*release CR on message_lockres*/
553 ret = dlm_unlock_sync(message_lockres);
554 if (unlikely(ret != 0))
555 pr_info("unlock msg failed return %d\n", ret);
556 mutex_unlock(&cinfo->recv_mutex);
557}
558
559/* lock_token()
560 * Takes the lock on the TOKEN lock resource so no other
561 * node can communicate while the operation is underway.
562 */
563static int lock_token(struct md_cluster_info *cinfo)
564{
565 int error;
566
567 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
568 if (error)
569 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
570 __func__, __LINE__, error);
571
572 /* Lock the receive sequence */
573 mutex_lock(&cinfo->recv_mutex);
574 return error;
575}
576
577/* lock_comm()
578 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
579 */
580static int lock_comm(struct md_cluster_info *cinfo)
581{
582 wait_event(cinfo->wait,
583 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
584
585 return lock_token(cinfo);
586}
587
588static void unlock_comm(struct md_cluster_info *cinfo)
589{
590 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
591 mutex_unlock(&cinfo->recv_mutex);
592 dlm_unlock_sync(cinfo->token_lockres);
593 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
594 wake_up(&cinfo->wait);
595}
596
597/* __sendmsg()
598 * This function performs the actual sending of the message. This function is
599 * usually called after performing the encompassing operation
600 * The function:
601 * 1. Grabs the message lockresource in EX mode
602 * 2. Copies the message to the message LVB
603 * 3. Downconverts message lockresource to CW
604 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
605 * and the other nodes read the message. The thread will wait here until all other
606 * nodes have released ack lock resource.
607 * 5. Downconvert ack lockresource to CR
608 */
609static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
610{
611 int error;
612 int slot = cinfo->slot_number - 1;
613
614 cmsg->slot = cpu_to_le32(slot);
615 /*get EX on Message*/
616 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
617 if (error) {
618 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
619 goto failed_message;
620 }
621
622 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
623 sizeof(struct cluster_msg));
624 /*down-convert EX to CW on Message*/
625 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
626 if (error) {
627 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
628 error);
629 goto failed_ack;
630 }
631
632 /*up-convert CR to EX on Ack*/
633 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
634 if (error) {
635 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
636 error);
637 goto failed_ack;
638 }
639
640 /*down-convert EX to CR on Ack*/
641 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
642 if (error) {
643 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
644 error);
645 goto failed_ack;
646 }
647
648failed_ack:
649 error = dlm_unlock_sync(cinfo->message_lockres);
650 if (unlikely(error != 0)) {
651 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
652 error);
653 /* in case the message can't be released due to some reason */
654 goto failed_ack;
655 }
656failed_message:
657 return error;
658}
659
660static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
661{
662 int ret;
663
664 lock_comm(cinfo);
665 ret = __sendmsg(cinfo, cmsg);
666 unlock_comm(cinfo);
667 return ret;
668}
669
670static int gather_all_resync_info(struct mddev *mddev, int total_slots)
671{
672 struct md_cluster_info *cinfo = mddev->cluster_info;
673 int i, ret = 0;
674 struct dlm_lock_resource *bm_lockres;
675 struct suspend_info *s;
676 char str[64];
677 sector_t lo, hi;
678
679
680 for (i = 0; i < total_slots; i++) {
681 memset(str, '\0', 64);
682 snprintf(str, 64, "bitmap%04d", i);
683 bm_lockres = lockres_init(mddev, str, NULL, 1);
684 if (!bm_lockres)
685 return -ENOMEM;
686 if (i == (cinfo->slot_number - 1)) {
687 lockres_free(bm_lockres);
688 continue;
689 }
690
691 bm_lockres->flags |= DLM_LKF_NOQUEUE;
692 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
693 if (ret == -EAGAIN) {
694 memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);
695 s = read_resync_info(mddev, bm_lockres);
696 if (s) {
697 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
698 __func__, __LINE__,
699 (unsigned long long) s->lo,
700 (unsigned long long) s->hi, i);
701 spin_lock_irq(&cinfo->suspend_lock);
702 s->slot = i;
703 list_add(&s->list, &cinfo->suspend_list);
704 spin_unlock_irq(&cinfo->suspend_lock);
705 }
706 ret = 0;
707 lockres_free(bm_lockres);
708 continue;
709 }
710 if (ret) {
711 lockres_free(bm_lockres);
712 goto out;
713 }
714
715 /* Read the disk bitmap sb and check if it needs recovery */
716 ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
717 if (ret) {
718 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
719 lockres_free(bm_lockres);
720 continue;
721 }
722 if ((hi > 0) && (lo < mddev->recovery_cp)) {
723 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
724 mddev->recovery_cp = lo;
725 md_check_recovery(mddev);
726 }
727
728 dlm_unlock_sync(bm_lockres);
729 lockres_free(bm_lockres);
730 }
731out:
732 return ret;
733}
734
735static int join(struct mddev *mddev, int nodes)
736{
737 struct md_cluster_info *cinfo;
738 int ret, ops_rv;
739 char str[64];
740
741 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
742 if (!cinfo)
743 return -ENOMEM;
744
745 INIT_LIST_HEAD(&cinfo->suspend_list);
746 spin_lock_init(&cinfo->suspend_lock);
747 init_completion(&cinfo->completion);
748 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
749 init_waitqueue_head(&cinfo->wait);
750 mutex_init(&cinfo->recv_mutex);
751
752 mddev->cluster_info = cinfo;
753
754 memset(str, 0, 64);
755 sprintf(str, "%pU", mddev->uuid);
756 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
757 DLM_LSFL_FS, LVB_SIZE,
758 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
759 if (ret)
760 goto err;
761 wait_for_completion(&cinfo->completion);
762 if (nodes < cinfo->slot_number) {
763 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
764 cinfo->slot_number, nodes);
765 ret = -ERANGE;
766 goto err;
767 }
768 /* Initiate the communication resources */
769 ret = -ENOMEM;
770 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
771 if (!cinfo->recv_thread) {
772 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
773 goto err;
774 }
775 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
776 if (!cinfo->message_lockres)
777 goto err;
778 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
779 if (!cinfo->token_lockres)
780 goto err;
781 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
782 if (!cinfo->ack_lockres)
783 goto err;
784 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
785 if (!cinfo->no_new_dev_lockres)
786 goto err;
787
788 /* get sync CR lock on ACK. */
789 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
790 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
791 ret);
792 /* get sync CR lock on no-new-dev. */
793 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
794 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
795
796
797 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
798 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
799 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
800 if (!cinfo->bitmap_lockres)
801 goto err;
802 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
803 pr_err("Failed to get bitmap lock\n");
804 ret = -EINVAL;
805 goto err;
806 }
807
808 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
809 if (!cinfo->resync_lockres)
810 goto err;
811
812 ret = gather_all_resync_info(mddev, nodes);
813 if (ret)
814 goto err;
815
816 return 0;
817err:
818 lockres_free(cinfo->message_lockres);
819 lockres_free(cinfo->token_lockres);
820 lockres_free(cinfo->ack_lockres);
821 lockres_free(cinfo->no_new_dev_lockres);
822 lockres_free(cinfo->resync_lockres);
823 lockres_free(cinfo->bitmap_lockres);
824 if (cinfo->lockspace)
825 dlm_release_lockspace(cinfo->lockspace, 2);
826 mddev->cluster_info = NULL;
827 kfree(cinfo);
828 return ret;
829}
830
831static void resync_bitmap(struct mddev *mddev)
832{
833 struct md_cluster_info *cinfo = mddev->cluster_info;
834 struct cluster_msg cmsg = {0};
835 int err;
836
837 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
838 err = sendmsg(cinfo, &cmsg);
839 if (err)
840 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
841 __func__, __LINE__, err);
842}
843
844static void unlock_all_bitmaps(struct mddev *mddev);
845static int leave(struct mddev *mddev)
846{
847 struct md_cluster_info *cinfo = mddev->cluster_info;
848
849 if (!cinfo)
850 return 0;
851
852 /* BITMAP_NEEDS_SYNC message should be sent when node
853 * is leaving the cluster with dirty bitmap, also we
854 * can only deliver it when dlm connection is available */
855 if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector)
856 resync_bitmap(mddev);
857
858 md_unregister_thread(&cinfo->recovery_thread);
859 md_unregister_thread(&cinfo->recv_thread);
860 lockres_free(cinfo->message_lockres);
861 lockres_free(cinfo->token_lockres);
862 lockres_free(cinfo->ack_lockres);
863 lockres_free(cinfo->no_new_dev_lockres);
864 lockres_free(cinfo->resync_lockres);
865 lockres_free(cinfo->bitmap_lockres);
866 unlock_all_bitmaps(mddev);
867 dlm_release_lockspace(cinfo->lockspace, 2);
868 return 0;
869}
870
871/* slot_number(): Returns the MD slot number to use
872 * DLM starts the slot numbers from 1, wheras cluster-md
873 * wants the number to be from zero, so we deduct one
874 */
875static int slot_number(struct mddev *mddev)
876{
877 struct md_cluster_info *cinfo = mddev->cluster_info;
878
879 return cinfo->slot_number - 1;
880}
881
882/*
883 * Check if the communication is already locked, else lock the communication
884 * channel.
885 * If it is already locked, token is in EX mode, and hence lock_token()
886 * should not be called.
887 */
888static int metadata_update_start(struct mddev *mddev)
889{
890 struct md_cluster_info *cinfo = mddev->cluster_info;
891
892 wait_event(cinfo->wait,
893 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
894 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
895
896 /* If token is already locked, return 0 */
897 if (cinfo->token_lockres->mode == DLM_LOCK_EX)
898 return 0;
899
900 return lock_token(cinfo);
901}
902
903static int metadata_update_finish(struct mddev *mddev)
904{
905 struct md_cluster_info *cinfo = mddev->cluster_info;
906 struct cluster_msg cmsg;
907 struct md_rdev *rdev;
908 int ret = 0;
909 int raid_slot = -1;
910
911 memset(&cmsg, 0, sizeof(cmsg));
912 cmsg.type = cpu_to_le32(METADATA_UPDATED);
913 /* Pick up a good active device number to send.
914 */
915 rdev_for_each(rdev, mddev)
916 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
917 raid_slot = rdev->desc_nr;
918 break;
919 }
920 if (raid_slot >= 0) {
921 cmsg.raid_slot = cpu_to_le32(raid_slot);
922 ret = __sendmsg(cinfo, &cmsg);
923 } else
924 pr_warn("md-cluster: No good device id found to send\n");
925 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
926 unlock_comm(cinfo);
927 return ret;
928}
929
930static void metadata_update_cancel(struct mddev *mddev)
931{
932 struct md_cluster_info *cinfo = mddev->cluster_info;
933 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
934 unlock_comm(cinfo);
935}
936
937static int resync_start(struct mddev *mddev)
938{
939 struct md_cluster_info *cinfo = mddev->cluster_info;
940 cinfo->resync_lockres->flags |= DLM_LKF_NOQUEUE;
941 return dlm_lock_sync(cinfo->resync_lockres, DLM_LOCK_EX);
942}
943
944static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
945{
946 struct md_cluster_info *cinfo = mddev->cluster_info;
947 struct resync_info ri;
948 struct cluster_msg cmsg = {0};
949
950 /* do not send zero again, if we have sent before */
951 if (hi == 0) {
952 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
953 if (le64_to_cpu(ri.hi) == 0)
954 return 0;
955 }
956
957 add_resync_info(cinfo->bitmap_lockres, lo, hi);
958 /* Re-acquire the lock to refresh LVB */
959 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
960 cmsg.type = cpu_to_le32(RESYNCING);
961 cmsg.low = cpu_to_le64(lo);
962 cmsg.high = cpu_to_le64(hi);
963
964 return sendmsg(cinfo, &cmsg);
965}
966
967static int resync_finish(struct mddev *mddev)
968{
969 struct md_cluster_info *cinfo = mddev->cluster_info;
970 cinfo->resync_lockres->flags &= ~DLM_LKF_NOQUEUE;
971 dlm_unlock_sync(cinfo->resync_lockres);
972 return resync_info_update(mddev, 0, 0);
973}
974
975static int area_resyncing(struct mddev *mddev, int direction,
976 sector_t lo, sector_t hi)
977{
978 struct md_cluster_info *cinfo = mddev->cluster_info;
979 int ret = 0;
980 struct suspend_info *s;
981
982 if ((direction == READ) &&
983 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
984 return 1;
985
986 spin_lock_irq(&cinfo->suspend_lock);
987 if (list_empty(&cinfo->suspend_list))
988 goto out;
989 list_for_each_entry(s, &cinfo->suspend_list, list)
990 if (hi > s->lo && lo < s->hi) {
991 ret = 1;
992 break;
993 }
994out:
995 spin_unlock_irq(&cinfo->suspend_lock);
996 return ret;
997}
998
999/* add_new_disk() - initiates a disk add
1000 * However, if this fails before writing md_update_sb(),
1001 * add_new_disk_cancel() must be called to release token lock
1002 */
1003static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
1004{
1005 struct md_cluster_info *cinfo = mddev->cluster_info;
1006 struct cluster_msg cmsg;
1007 int ret = 0;
1008 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1009 char *uuid = sb->device_uuid;
1010
1011 memset(&cmsg, 0, sizeof(cmsg));
1012 cmsg.type = cpu_to_le32(NEWDISK);
1013 memcpy(cmsg.uuid, uuid, 16);
1014 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1015 lock_comm(cinfo);
1016 ret = __sendmsg(cinfo, &cmsg);
1017 if (ret)
1018 return ret;
1019 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
1020 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
1021 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
1022 /* Some node does not "see" the device */
1023 if (ret == -EAGAIN)
1024 ret = -ENOENT;
1025 if (ret)
1026 unlock_comm(cinfo);
1027 else {
1028 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
1029 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
1030 * will run soon after add_new_disk, the below path will be
1031 * invoked:
1032 * md_wakeup_thread(mddev->thread)
1033 * -> conf->thread (raid1d)
1034 * -> md_check_recovery -> md_update_sb
1035 * -> metadata_update_start/finish
1036 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
1037 *
1038 * For other failure cases, metadata_update_cancel and
1039 * add_new_disk_cancel also clear below bit as well.
1040 * */
1041 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1042 wake_up(&cinfo->wait);
1043 }
1044 return ret;
1045}
1046
1047static void add_new_disk_cancel(struct mddev *mddev)
1048{
1049 struct md_cluster_info *cinfo = mddev->cluster_info;
1050 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1051 unlock_comm(cinfo);
1052}
1053
1054static int new_disk_ack(struct mddev *mddev, bool ack)
1055{
1056 struct md_cluster_info *cinfo = mddev->cluster_info;
1057
1058 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
1059 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
1060 return -EINVAL;
1061 }
1062
1063 if (ack)
1064 dlm_unlock_sync(cinfo->no_new_dev_lockres);
1065 complete(&cinfo->newdisk_completion);
1066 return 0;
1067}
1068
1069static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
1070{
1071 struct cluster_msg cmsg = {0};
1072 struct md_cluster_info *cinfo = mddev->cluster_info;
1073 cmsg.type = cpu_to_le32(REMOVE);
1074 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1075 return sendmsg(cinfo, &cmsg);
1076}
1077
1078static int lock_all_bitmaps(struct mddev *mddev)
1079{
1080 int slot, my_slot, ret, held = 1, i = 0;
1081 char str[64];
1082 struct md_cluster_info *cinfo = mddev->cluster_info;
1083
1084 cinfo->other_bitmap_lockres = kzalloc((mddev->bitmap_info.nodes - 1) *
1085 sizeof(struct dlm_lock_resource *),
1086 GFP_KERNEL);
1087 if (!cinfo->other_bitmap_lockres) {
1088 pr_err("md: can't alloc mem for other bitmap locks\n");
1089 return 0;
1090 }
1091
1092 my_slot = slot_number(mddev);
1093 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
1094 if (slot == my_slot)
1095 continue;
1096
1097 memset(str, '\0', 64);
1098 snprintf(str, 64, "bitmap%04d", slot);
1099 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
1100 if (!cinfo->other_bitmap_lockres[i])
1101 return -ENOMEM;
1102
1103 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
1104 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
1105 if (ret)
1106 held = -1;
1107 i++;
1108 }
1109
1110 return held;
1111}
1112
1113static void unlock_all_bitmaps(struct mddev *mddev)
1114{
1115 struct md_cluster_info *cinfo = mddev->cluster_info;
1116 int i;
1117
1118 /* release other node's bitmap lock if they are existed */
1119 if (cinfo->other_bitmap_lockres) {
1120 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
1121 if (cinfo->other_bitmap_lockres[i]) {
1122 dlm_unlock_sync(cinfo->other_bitmap_lockres[i]);
1123 lockres_free(cinfo->other_bitmap_lockres[i]);
1124 }
1125 }
1126 kfree(cinfo->other_bitmap_lockres);
1127 }
1128}
1129
1130static int gather_bitmaps(struct md_rdev *rdev)
1131{
1132 int sn, err;
1133 sector_t lo, hi;
1134 struct cluster_msg cmsg = {0};
1135 struct mddev *mddev = rdev->mddev;
1136 struct md_cluster_info *cinfo = mddev->cluster_info;
1137
1138 cmsg.type = cpu_to_le32(RE_ADD);
1139 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1140 err = sendmsg(cinfo, &cmsg);
1141 if (err)
1142 goto out;
1143
1144 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1145 if (sn == (cinfo->slot_number - 1))
1146 continue;
1147 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
1148 if (err) {
1149 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1150 goto out;
1151 }
1152 if ((hi > 0) && (lo < mddev->recovery_cp))
1153 mddev->recovery_cp = lo;
1154 }
1155out:
1156 return err;
1157}
1158
1159static struct md_cluster_operations cluster_ops = {
1160 .join = join,
1161 .leave = leave,
1162 .slot_number = slot_number,
1163 .resync_start = resync_start,
1164 .resync_finish = resync_finish,
1165 .resync_info_update = resync_info_update,
1166 .metadata_update_start = metadata_update_start,
1167 .metadata_update_finish = metadata_update_finish,
1168 .metadata_update_cancel = metadata_update_cancel,
1169 .area_resyncing = area_resyncing,
1170 .add_new_disk = add_new_disk,
1171 .add_new_disk_cancel = add_new_disk_cancel,
1172 .new_disk_ack = new_disk_ack,
1173 .remove_disk = remove_disk,
1174 .gather_bitmaps = gather_bitmaps,
1175 .lock_all_bitmaps = lock_all_bitmaps,
1176 .unlock_all_bitmaps = unlock_all_bitmaps,
1177};
1178
1179static int __init cluster_init(void)
1180{
1181 pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
1182 pr_info("Registering Cluster MD functions\n");
1183 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
1184 return 0;
1185}
1186
1187static void cluster_exit(void)
1188{
1189 unregister_md_cluster_operations();
1190}
1191
1192module_init(cluster_init);
1193module_exit(cluster_exit);
1194MODULE_AUTHOR("SUSE");
1195MODULE_LICENSE("GPL");
1196MODULE_DESCRIPTION("Clustering support for MD");