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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/kthread.h>
14#include <linux/dlm.h>
15#include <linux/sched.h>
16#include <linux/raid/md_p.h>
17#include "md.h"
18#include "md-bitmap.h"
19#include "md-cluster.h"
20
21#define LVB_SIZE 64
22#define NEW_DEV_TIMEOUT 5000
23
24struct dlm_lock_resource {
25 dlm_lockspace_t *ls;
26 struct dlm_lksb lksb;
27 char *name; /* lock name. */
28 uint32_t flags; /* flags to pass to dlm_lock() */
29 wait_queue_head_t sync_locking; /* wait queue for synchronized locking */
30 bool sync_locking_done;
31 void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
32 struct mddev *mddev; /* pointing back to mddev. */
33 int mode;
34};
35
36struct suspend_info {
37 int slot;
38 sector_t lo;
39 sector_t hi;
40 struct list_head list;
41};
42
43struct resync_info {
44 __le64 lo;
45 __le64 hi;
46};
47
48/* md_cluster_info flags */
49#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
50#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
51#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
52
53/* Lock the send communication. This is done through
54 * bit manipulation as opposed to a mutex in order to
55 * accomodate lock and hold. See next comment.
56 */
57#define MD_CLUSTER_SEND_LOCK 4
58/* If cluster operations (such as adding a disk) must lock the
59 * communication channel, so as to perform extra operations
60 * (update metadata) and no other operation is allowed on the
61 * MD. Token needs to be locked and held until the operation
62 * completes witha md_update_sb(), which would eventually release
63 * the lock.
64 */
65#define MD_CLUSTER_SEND_LOCKED_ALREADY 5
66/* We should receive message after node joined cluster and
67 * set up all the related infos such as bitmap and personality */
68#define MD_CLUSTER_ALREADY_IN_CLUSTER 6
69#define MD_CLUSTER_PENDING_RECV_EVENT 7
70#define MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD 8
71
72struct md_cluster_info {
73 struct mddev *mddev; /* the md device which md_cluster_info belongs to */
74 /* dlm lock space and resources for clustered raid. */
75 dlm_lockspace_t *lockspace;
76 int slot_number;
77 struct completion completion;
78 struct mutex recv_mutex;
79 struct dlm_lock_resource *bitmap_lockres;
80 struct dlm_lock_resource **other_bitmap_lockres;
81 struct dlm_lock_resource *resync_lockres;
82 struct list_head suspend_list;
83 spinlock_t suspend_lock;
84 struct md_thread *recovery_thread;
85 unsigned long recovery_map;
86 /* communication loc resources */
87 struct dlm_lock_resource *ack_lockres;
88 struct dlm_lock_resource *message_lockres;
89 struct dlm_lock_resource *token_lockres;
90 struct dlm_lock_resource *no_new_dev_lockres;
91 struct md_thread *recv_thread;
92 struct completion newdisk_completion;
93 wait_queue_head_t wait;
94 unsigned long state;
95 /* record the region in RESYNCING message */
96 sector_t sync_low;
97 sector_t sync_hi;
98};
99
100enum msg_type {
101 METADATA_UPDATED = 0,
102 RESYNCING,
103 NEWDISK,
104 REMOVE,
105 RE_ADD,
106 BITMAP_NEEDS_SYNC,
107 CHANGE_CAPACITY,
108};
109
110struct cluster_msg {
111 __le32 type;
112 __le32 slot;
113 /* TODO: Unionize this for smaller footprint */
114 __le64 low;
115 __le64 high;
116 char uuid[16];
117 __le32 raid_slot;
118};
119
120static void sync_ast(void *arg)
121{
122 struct dlm_lock_resource *res;
123
124 res = arg;
125 res->sync_locking_done = true;
126 wake_up(&res->sync_locking);
127}
128
129static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
130{
131 int ret = 0;
132
133 ret = dlm_lock(res->ls, mode, &res->lksb,
134 res->flags, res->name, strlen(res->name),
135 0, sync_ast, res, res->bast);
136 if (ret)
137 return ret;
138 wait_event(res->sync_locking, res->sync_locking_done);
139 res->sync_locking_done = false;
140 if (res->lksb.sb_status == 0)
141 res->mode = mode;
142 return res->lksb.sb_status;
143}
144
145static int dlm_unlock_sync(struct dlm_lock_resource *res)
146{
147 return dlm_lock_sync(res, DLM_LOCK_NL);
148}
149
150/*
151 * An variation of dlm_lock_sync, which make lock request could
152 * be interrupted
153 */
154static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode,
155 struct mddev *mddev)
156{
157 int ret = 0;
158
159 ret = dlm_lock(res->ls, mode, &res->lksb,
160 res->flags, res->name, strlen(res->name),
161 0, sync_ast, res, res->bast);
162 if (ret)
163 return ret;
164
165 wait_event(res->sync_locking, res->sync_locking_done
166 || kthread_should_stop()
167 || test_bit(MD_CLOSING, &mddev->flags));
168 if (!res->sync_locking_done) {
169 /*
170 * the convert queue contains the lock request when request is
171 * interrupted, and sync_ast could still be run, so need to
172 * cancel the request and reset completion
173 */
174 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL,
175 &res->lksb, res);
176 res->sync_locking_done = false;
177 if (unlikely(ret != 0))
178 pr_info("failed to cancel previous lock request "
179 "%s return %d\n", res->name, ret);
180 return -EPERM;
181 } else
182 res->sync_locking_done = false;
183 if (res->lksb.sb_status == 0)
184 res->mode = mode;
185 return res->lksb.sb_status;
186}
187
188static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
189 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
190{
191 struct dlm_lock_resource *res = NULL;
192 int ret, namelen;
193 struct md_cluster_info *cinfo = mddev->cluster_info;
194
195 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
196 if (!res)
197 return NULL;
198 init_waitqueue_head(&res->sync_locking);
199 res->sync_locking_done = false;
200 res->ls = cinfo->lockspace;
201 res->mddev = mddev;
202 res->mode = DLM_LOCK_IV;
203 namelen = strlen(name);
204 res->name = kzalloc(namelen + 1, GFP_KERNEL);
205 if (!res->name) {
206 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
207 goto out_err;
208 }
209 strlcpy(res->name, name, namelen + 1);
210 if (with_lvb) {
211 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
212 if (!res->lksb.sb_lvbptr) {
213 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
214 goto out_err;
215 }
216 res->flags = DLM_LKF_VALBLK;
217 }
218
219 if (bastfn)
220 res->bast = bastfn;
221
222 res->flags |= DLM_LKF_EXPEDITE;
223
224 ret = dlm_lock_sync(res, DLM_LOCK_NL);
225 if (ret) {
226 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
227 goto out_err;
228 }
229 res->flags &= ~DLM_LKF_EXPEDITE;
230 res->flags |= DLM_LKF_CONVERT;
231
232 return res;
233out_err:
234 kfree(res->lksb.sb_lvbptr);
235 kfree(res->name);
236 kfree(res);
237 return NULL;
238}
239
240static void lockres_free(struct dlm_lock_resource *res)
241{
242 int ret = 0;
243
244 if (!res)
245 return;
246
247 /*
248 * use FORCEUNLOCK flag, so we can unlock even the lock is on the
249 * waiting or convert queue
250 */
251 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK,
252 &res->lksb, res);
253 if (unlikely(ret != 0))
254 pr_err("failed to unlock %s return %d\n", res->name, ret);
255 else
256 wait_event(res->sync_locking, res->sync_locking_done);
257
258 kfree(res->name);
259 kfree(res->lksb.sb_lvbptr);
260 kfree(res);
261}
262
263static void add_resync_info(struct dlm_lock_resource *lockres,
264 sector_t lo, sector_t hi)
265{
266 struct resync_info *ri;
267
268 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
269 ri->lo = cpu_to_le64(lo);
270 ri->hi = cpu_to_le64(hi);
271}
272
273static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
274{
275 struct resync_info ri;
276 struct suspend_info *s = NULL;
277 sector_t hi = 0;
278
279 dlm_lock_sync(lockres, DLM_LOCK_CR);
280 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
281 hi = le64_to_cpu(ri.hi);
282 if (hi > 0) {
283 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
284 if (!s)
285 goto out;
286 s->hi = hi;
287 s->lo = le64_to_cpu(ri.lo);
288 }
289 dlm_unlock_sync(lockres);
290out:
291 return s;
292}
293
294static void recover_bitmaps(struct md_thread *thread)
295{
296 struct mddev *mddev = thread->mddev;
297 struct md_cluster_info *cinfo = mddev->cluster_info;
298 struct dlm_lock_resource *bm_lockres;
299 char str[64];
300 int slot, ret;
301 struct suspend_info *s, *tmp;
302 sector_t lo, hi;
303
304 while (cinfo->recovery_map) {
305 slot = fls64((u64)cinfo->recovery_map) - 1;
306
307 /* Clear suspend_area associated with the bitmap */
308 spin_lock_irq(&cinfo->suspend_lock);
309 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
310 if (slot == s->slot) {
311 list_del(&s->list);
312 kfree(s);
313 }
314 spin_unlock_irq(&cinfo->suspend_lock);
315
316 snprintf(str, 64, "bitmap%04d", slot);
317 bm_lockres = lockres_init(mddev, str, NULL, 1);
318 if (!bm_lockres) {
319 pr_err("md-cluster: Cannot initialize bitmaps\n");
320 goto clear_bit;
321 }
322
323 ret = dlm_lock_sync_interruptible(bm_lockres, DLM_LOCK_PW, mddev);
324 if (ret) {
325 pr_err("md-cluster: Could not DLM lock %s: %d\n",
326 str, ret);
327 goto clear_bit;
328 }
329 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
330 if (ret) {
331 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
332 goto clear_bit;
333 }
334 if (hi > 0) {
335 if (lo < mddev->recovery_cp)
336 mddev->recovery_cp = lo;
337 /* wake up thread to continue resync in case resync
338 * is not finished */
339 if (mddev->recovery_cp != MaxSector) {
340 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
341 md_wakeup_thread(mddev->thread);
342 }
343 }
344clear_bit:
345 lockres_free(bm_lockres);
346 clear_bit(slot, &cinfo->recovery_map);
347 }
348}
349
350static void recover_prep(void *arg)
351{
352 struct mddev *mddev = arg;
353 struct md_cluster_info *cinfo = mddev->cluster_info;
354 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
355}
356
357static void __recover_slot(struct mddev *mddev, int slot)
358{
359 struct md_cluster_info *cinfo = mddev->cluster_info;
360
361 set_bit(slot, &cinfo->recovery_map);
362 if (!cinfo->recovery_thread) {
363 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
364 mddev, "recover");
365 if (!cinfo->recovery_thread) {
366 pr_warn("md-cluster: Could not create recovery thread\n");
367 return;
368 }
369 }
370 md_wakeup_thread(cinfo->recovery_thread);
371}
372
373static void recover_slot(void *arg, struct dlm_slot *slot)
374{
375 struct mddev *mddev = arg;
376 struct md_cluster_info *cinfo = mddev->cluster_info;
377
378 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
379 mddev->bitmap_info.cluster_name,
380 slot->nodeid, slot->slot,
381 cinfo->slot_number);
382 /* deduct one since dlm slot starts from one while the num of
383 * cluster-md begins with 0 */
384 __recover_slot(mddev, slot->slot - 1);
385}
386
387static void recover_done(void *arg, struct dlm_slot *slots,
388 int num_slots, int our_slot,
389 uint32_t generation)
390{
391 struct mddev *mddev = arg;
392 struct md_cluster_info *cinfo = mddev->cluster_info;
393
394 cinfo->slot_number = our_slot;
395 /* completion is only need to be complete when node join cluster,
396 * it doesn't need to run during another node's failure */
397 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
398 complete(&cinfo->completion);
399 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
400 }
401 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
402}
403
404/* the ops is called when node join the cluster, and do lock recovery
405 * if node failure occurs */
406static const struct dlm_lockspace_ops md_ls_ops = {
407 .recover_prep = recover_prep,
408 .recover_slot = recover_slot,
409 .recover_done = recover_done,
410};
411
412/*
413 * The BAST function for the ack lock resource
414 * This function wakes up the receive thread in
415 * order to receive and process the message.
416 */
417static void ack_bast(void *arg, int mode)
418{
419 struct dlm_lock_resource *res = arg;
420 struct md_cluster_info *cinfo = res->mddev->cluster_info;
421
422 if (mode == DLM_LOCK_EX) {
423 if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state))
424 md_wakeup_thread(cinfo->recv_thread);
425 else
426 set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state);
427 }
428}
429
430static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
431{
432 struct suspend_info *s, *tmp;
433
434 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
435 if (slot == s->slot) {
436 list_del(&s->list);
437 kfree(s);
438 break;
439 }
440}
441
442static void remove_suspend_info(struct mddev *mddev, int slot)
443{
444 struct md_cluster_info *cinfo = mddev->cluster_info;
445 mddev->pers->quiesce(mddev, 1);
446 spin_lock_irq(&cinfo->suspend_lock);
447 __remove_suspend_info(cinfo, slot);
448 spin_unlock_irq(&cinfo->suspend_lock);
449 mddev->pers->quiesce(mddev, 0);
450}
451
452
453static void process_suspend_info(struct mddev *mddev,
454 int slot, sector_t lo, sector_t hi)
455{
456 struct md_cluster_info *cinfo = mddev->cluster_info;
457 struct suspend_info *s;
458
459 if (!hi) {
460 remove_suspend_info(mddev, slot);
461 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
462 md_wakeup_thread(mddev->thread);
463 return;
464 }
465
466 /*
467 * The bitmaps are not same for different nodes
468 * if RESYNCING is happening in one node, then
469 * the node which received the RESYNCING message
470 * probably will perform resync with the region
471 * [lo, hi] again, so we could reduce resync time
472 * a lot if we can ensure that the bitmaps among
473 * different nodes are match up well.
474 *
475 * sync_low/hi is used to record the region which
476 * arrived in the previous RESYNCING message,
477 *
478 * Call bitmap_sync_with_cluster to clear
479 * NEEDED_MASK and set RESYNC_MASK since
480 * resync thread is running in another node,
481 * so we don't need to do the resync again
482 * with the same section */
483 bitmap_sync_with_cluster(mddev, cinfo->sync_low,
484 cinfo->sync_hi,
485 lo, hi);
486 cinfo->sync_low = lo;
487 cinfo->sync_hi = hi;
488
489 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
490 if (!s)
491 return;
492 s->slot = slot;
493 s->lo = lo;
494 s->hi = hi;
495 mddev->pers->quiesce(mddev, 1);
496 spin_lock_irq(&cinfo->suspend_lock);
497 /* Remove existing entry (if exists) before adding */
498 __remove_suspend_info(cinfo, slot);
499 list_add(&s->list, &cinfo->suspend_list);
500 spin_unlock_irq(&cinfo->suspend_lock);
501 mddev->pers->quiesce(mddev, 0);
502}
503
504static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
505{
506 char disk_uuid[64];
507 struct md_cluster_info *cinfo = mddev->cluster_info;
508 char event_name[] = "EVENT=ADD_DEVICE";
509 char raid_slot[16];
510 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
511 int len;
512
513 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
514 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
515 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
516 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
517 init_completion(&cinfo->newdisk_completion);
518 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
519 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
520 wait_for_completion_timeout(&cinfo->newdisk_completion,
521 NEW_DEV_TIMEOUT);
522 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
523}
524
525
526static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
527{
528 int got_lock = 0;
529 struct md_cluster_info *cinfo = mddev->cluster_info;
530 mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
531
532 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
533 wait_event(mddev->thread->wqueue,
534 (got_lock = mddev_trylock(mddev)) ||
535 test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state));
536 md_reload_sb(mddev, mddev->good_device_nr);
537 if (got_lock)
538 mddev_unlock(mddev);
539}
540
541static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
542{
543 struct md_rdev *rdev;
544
545 rcu_read_lock();
546 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
547 if (rdev) {
548 set_bit(ClusterRemove, &rdev->flags);
549 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
550 md_wakeup_thread(mddev->thread);
551 }
552 else
553 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
554 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
555 rcu_read_unlock();
556}
557
558static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
559{
560 struct md_rdev *rdev;
561
562 rcu_read_lock();
563 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
564 if (rdev && test_bit(Faulty, &rdev->flags))
565 clear_bit(Faulty, &rdev->flags);
566 else
567 pr_warn("%s: %d Could not find disk(%d) which is faulty",
568 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
569 rcu_read_unlock();
570}
571
572static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
573{
574 int ret = 0;
575
576 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
577 "node %d received it's own msg\n", le32_to_cpu(msg->slot)))
578 return -1;
579 switch (le32_to_cpu(msg->type)) {
580 case METADATA_UPDATED:
581 process_metadata_update(mddev, msg);
582 break;
583 case CHANGE_CAPACITY:
584 set_capacity(mddev->gendisk, mddev->array_sectors);
585 revalidate_disk(mddev->gendisk);
586 break;
587 case RESYNCING:
588 process_suspend_info(mddev, le32_to_cpu(msg->slot),
589 le64_to_cpu(msg->low),
590 le64_to_cpu(msg->high));
591 break;
592 case NEWDISK:
593 process_add_new_disk(mddev, msg);
594 break;
595 case REMOVE:
596 process_remove_disk(mddev, msg);
597 break;
598 case RE_ADD:
599 process_readd_disk(mddev, msg);
600 break;
601 case BITMAP_NEEDS_SYNC:
602 __recover_slot(mddev, le32_to_cpu(msg->slot));
603 break;
604 default:
605 ret = -1;
606 pr_warn("%s:%d Received unknown message from %d\n",
607 __func__, __LINE__, msg->slot);
608 }
609 return ret;
610}
611
612/*
613 * thread for receiving message
614 */
615static void recv_daemon(struct md_thread *thread)
616{
617 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
618 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
619 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
620 struct cluster_msg msg;
621 int ret;
622
623 mutex_lock(&cinfo->recv_mutex);
624 /*get CR on Message*/
625 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
626 pr_err("md/raid1:failed to get CR on MESSAGE\n");
627 mutex_unlock(&cinfo->recv_mutex);
628 return;
629 }
630
631 /* read lvb and wake up thread to process this message_lockres */
632 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
633 ret = process_recvd_msg(thread->mddev, &msg);
634 if (ret)
635 goto out;
636
637 /*release CR on ack_lockres*/
638 ret = dlm_unlock_sync(ack_lockres);
639 if (unlikely(ret != 0))
640 pr_info("unlock ack failed return %d\n", ret);
641 /*up-convert to PR on message_lockres*/
642 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
643 if (unlikely(ret != 0))
644 pr_info("lock PR on msg failed return %d\n", ret);
645 /*get CR on ack_lockres again*/
646 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
647 if (unlikely(ret != 0))
648 pr_info("lock CR on ack failed return %d\n", ret);
649out:
650 /*release CR on message_lockres*/
651 ret = dlm_unlock_sync(message_lockres);
652 if (unlikely(ret != 0))
653 pr_info("unlock msg failed return %d\n", ret);
654 mutex_unlock(&cinfo->recv_mutex);
655}
656
657/* lock_token()
658 * Takes the lock on the TOKEN lock resource so no other
659 * node can communicate while the operation is underway.
660 */
661static int lock_token(struct md_cluster_info *cinfo, bool mddev_locked)
662{
663 int error, set_bit = 0;
664 struct mddev *mddev = cinfo->mddev;
665
666 /*
667 * If resync thread run after raid1d thread, then process_metadata_update
668 * could not continue if raid1d held reconfig_mutex (and raid1d is blocked
669 * since another node already got EX on Token and waitting the EX of Ack),
670 * so let resync wake up thread in case flag is set.
671 */
672 if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
673 &cinfo->state)) {
674 error = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
675 &cinfo->state);
676 WARN_ON_ONCE(error);
677 md_wakeup_thread(mddev->thread);
678 set_bit = 1;
679 }
680 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
681 if (set_bit)
682 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
683
684 if (error)
685 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
686 __func__, __LINE__, error);
687
688 /* Lock the receive sequence */
689 mutex_lock(&cinfo->recv_mutex);
690 return error;
691}
692
693/* lock_comm()
694 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
695 */
696static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked)
697{
698 wait_event(cinfo->wait,
699 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
700
701 return lock_token(cinfo, mddev_locked);
702}
703
704static void unlock_comm(struct md_cluster_info *cinfo)
705{
706 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
707 mutex_unlock(&cinfo->recv_mutex);
708 dlm_unlock_sync(cinfo->token_lockres);
709 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
710 wake_up(&cinfo->wait);
711}
712
713/* __sendmsg()
714 * This function performs the actual sending of the message. This function is
715 * usually called after performing the encompassing operation
716 * The function:
717 * 1. Grabs the message lockresource in EX mode
718 * 2. Copies the message to the message LVB
719 * 3. Downconverts message lockresource to CW
720 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
721 * and the other nodes read the message. The thread will wait here until all other
722 * nodes have released ack lock resource.
723 * 5. Downconvert ack lockresource to CR
724 */
725static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
726{
727 int error;
728 int slot = cinfo->slot_number - 1;
729
730 cmsg->slot = cpu_to_le32(slot);
731 /*get EX on Message*/
732 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
733 if (error) {
734 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
735 goto failed_message;
736 }
737
738 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
739 sizeof(struct cluster_msg));
740 /*down-convert EX to CW on Message*/
741 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
742 if (error) {
743 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
744 error);
745 goto failed_ack;
746 }
747
748 /*up-convert CR to EX on Ack*/
749 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
750 if (error) {
751 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
752 error);
753 goto failed_ack;
754 }
755
756 /*down-convert EX to CR on Ack*/
757 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
758 if (error) {
759 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
760 error);
761 goto failed_ack;
762 }
763
764failed_ack:
765 error = dlm_unlock_sync(cinfo->message_lockres);
766 if (unlikely(error != 0)) {
767 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
768 error);
769 /* in case the message can't be released due to some reason */
770 goto failed_ack;
771 }
772failed_message:
773 return error;
774}
775
776static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg,
777 bool mddev_locked)
778{
779 int ret;
780
781 lock_comm(cinfo, mddev_locked);
782 ret = __sendmsg(cinfo, cmsg);
783 unlock_comm(cinfo);
784 return ret;
785}
786
787static int gather_all_resync_info(struct mddev *mddev, int total_slots)
788{
789 struct md_cluster_info *cinfo = mddev->cluster_info;
790 int i, ret = 0;
791 struct dlm_lock_resource *bm_lockres;
792 struct suspend_info *s;
793 char str[64];
794 sector_t lo, hi;
795
796
797 for (i = 0; i < total_slots; i++) {
798 memset(str, '\0', 64);
799 snprintf(str, 64, "bitmap%04d", i);
800 bm_lockres = lockres_init(mddev, str, NULL, 1);
801 if (!bm_lockres)
802 return -ENOMEM;
803 if (i == (cinfo->slot_number - 1)) {
804 lockres_free(bm_lockres);
805 continue;
806 }
807
808 bm_lockres->flags |= DLM_LKF_NOQUEUE;
809 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
810 if (ret == -EAGAIN) {
811 s = read_resync_info(mddev, bm_lockres);
812 if (s) {
813 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
814 __func__, __LINE__,
815 (unsigned long long) s->lo,
816 (unsigned long long) s->hi, i);
817 spin_lock_irq(&cinfo->suspend_lock);
818 s->slot = i;
819 list_add(&s->list, &cinfo->suspend_list);
820 spin_unlock_irq(&cinfo->suspend_lock);
821 }
822 ret = 0;
823 lockres_free(bm_lockres);
824 continue;
825 }
826 if (ret) {
827 lockres_free(bm_lockres);
828 goto out;
829 }
830
831 /* Read the disk bitmap sb and check if it needs recovery */
832 ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
833 if (ret) {
834 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
835 lockres_free(bm_lockres);
836 continue;
837 }
838 if ((hi > 0) && (lo < mddev->recovery_cp)) {
839 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
840 mddev->recovery_cp = lo;
841 md_check_recovery(mddev);
842 }
843
844 lockres_free(bm_lockres);
845 }
846out:
847 return ret;
848}
849
850static int join(struct mddev *mddev, int nodes)
851{
852 struct md_cluster_info *cinfo;
853 int ret, ops_rv;
854 char str[64];
855
856 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
857 if (!cinfo)
858 return -ENOMEM;
859
860 INIT_LIST_HEAD(&cinfo->suspend_list);
861 spin_lock_init(&cinfo->suspend_lock);
862 init_completion(&cinfo->completion);
863 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
864 init_waitqueue_head(&cinfo->wait);
865 mutex_init(&cinfo->recv_mutex);
866
867 mddev->cluster_info = cinfo;
868 cinfo->mddev = mddev;
869
870 memset(str, 0, 64);
871 sprintf(str, "%pU", mddev->uuid);
872 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
873 DLM_LSFL_FS, LVB_SIZE,
874 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
875 if (ret)
876 goto err;
877 wait_for_completion(&cinfo->completion);
878 if (nodes < cinfo->slot_number) {
879 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
880 cinfo->slot_number, nodes);
881 ret = -ERANGE;
882 goto err;
883 }
884 /* Initiate the communication resources */
885 ret = -ENOMEM;
886 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
887 if (!cinfo->recv_thread) {
888 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
889 goto err;
890 }
891 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
892 if (!cinfo->message_lockres)
893 goto err;
894 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
895 if (!cinfo->token_lockres)
896 goto err;
897 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
898 if (!cinfo->no_new_dev_lockres)
899 goto err;
900
901 ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
902 if (ret) {
903 ret = -EAGAIN;
904 pr_err("md-cluster: can't join cluster to avoid lock issue\n");
905 goto err;
906 }
907 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
908 if (!cinfo->ack_lockres) {
909 ret = -ENOMEM;
910 goto err;
911 }
912 /* get sync CR lock on ACK. */
913 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
914 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
915 ret);
916 dlm_unlock_sync(cinfo->token_lockres);
917 /* get sync CR lock on no-new-dev. */
918 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
919 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
920
921
922 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
923 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
924 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
925 if (!cinfo->bitmap_lockres) {
926 ret = -ENOMEM;
927 goto err;
928 }
929 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
930 pr_err("Failed to get bitmap lock\n");
931 ret = -EINVAL;
932 goto err;
933 }
934
935 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
936 if (!cinfo->resync_lockres) {
937 ret = -ENOMEM;
938 goto err;
939 }
940
941 return 0;
942err:
943 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
944 md_unregister_thread(&cinfo->recovery_thread);
945 md_unregister_thread(&cinfo->recv_thread);
946 lockres_free(cinfo->message_lockres);
947 lockres_free(cinfo->token_lockres);
948 lockres_free(cinfo->ack_lockres);
949 lockres_free(cinfo->no_new_dev_lockres);
950 lockres_free(cinfo->resync_lockres);
951 lockres_free(cinfo->bitmap_lockres);
952 if (cinfo->lockspace)
953 dlm_release_lockspace(cinfo->lockspace, 2);
954 mddev->cluster_info = NULL;
955 kfree(cinfo);
956 return ret;
957}
958
959static void load_bitmaps(struct mddev *mddev, int total_slots)
960{
961 struct md_cluster_info *cinfo = mddev->cluster_info;
962
963 /* load all the node's bitmap info for resync */
964 if (gather_all_resync_info(mddev, total_slots))
965 pr_err("md-cluster: failed to gather all resyn infos\n");
966 set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state);
967 /* wake up recv thread in case something need to be handled */
968 if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state))
969 md_wakeup_thread(cinfo->recv_thread);
970}
971
972static void resync_bitmap(struct mddev *mddev)
973{
974 struct md_cluster_info *cinfo = mddev->cluster_info;
975 struct cluster_msg cmsg = {0};
976 int err;
977
978 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
979 err = sendmsg(cinfo, &cmsg, 1);
980 if (err)
981 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
982 __func__, __LINE__, err);
983}
984
985static void unlock_all_bitmaps(struct mddev *mddev);
986static int leave(struct mddev *mddev)
987{
988 struct md_cluster_info *cinfo = mddev->cluster_info;
989
990 if (!cinfo)
991 return 0;
992
993 /* BITMAP_NEEDS_SYNC message should be sent when node
994 * is leaving the cluster with dirty bitmap, also we
995 * can only deliver it when dlm connection is available */
996 if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector)
997 resync_bitmap(mddev);
998
999 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1000 md_unregister_thread(&cinfo->recovery_thread);
1001 md_unregister_thread(&cinfo->recv_thread);
1002 lockres_free(cinfo->message_lockres);
1003 lockres_free(cinfo->token_lockres);
1004 lockres_free(cinfo->ack_lockres);
1005 lockres_free(cinfo->no_new_dev_lockres);
1006 lockres_free(cinfo->resync_lockres);
1007 lockres_free(cinfo->bitmap_lockres);
1008 unlock_all_bitmaps(mddev);
1009 dlm_release_lockspace(cinfo->lockspace, 2);
1010 kfree(cinfo);
1011 return 0;
1012}
1013
1014/* slot_number(): Returns the MD slot number to use
1015 * DLM starts the slot numbers from 1, wheras cluster-md
1016 * wants the number to be from zero, so we deduct one
1017 */
1018static int slot_number(struct mddev *mddev)
1019{
1020 struct md_cluster_info *cinfo = mddev->cluster_info;
1021
1022 return cinfo->slot_number - 1;
1023}
1024
1025/*
1026 * Check if the communication is already locked, else lock the communication
1027 * channel.
1028 * If it is already locked, token is in EX mode, and hence lock_token()
1029 * should not be called.
1030 */
1031static int metadata_update_start(struct mddev *mddev)
1032{
1033 struct md_cluster_info *cinfo = mddev->cluster_info;
1034 int ret;
1035
1036 /*
1037 * metadata_update_start is always called with the protection of
1038 * reconfig_mutex, so set WAITING_FOR_TOKEN here.
1039 */
1040 ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
1041 &cinfo->state);
1042 WARN_ON_ONCE(ret);
1043 md_wakeup_thread(mddev->thread);
1044
1045 wait_event(cinfo->wait,
1046 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
1047 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
1048
1049 /* If token is already locked, return 0 */
1050 if (cinfo->token_lockres->mode == DLM_LOCK_EX) {
1051 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1052 return 0;
1053 }
1054
1055 ret = lock_token(cinfo, 1);
1056 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1057 return ret;
1058}
1059
1060static int metadata_update_finish(struct mddev *mddev)
1061{
1062 struct md_cluster_info *cinfo = mddev->cluster_info;
1063 struct cluster_msg cmsg;
1064 struct md_rdev *rdev;
1065 int ret = 0;
1066 int raid_slot = -1;
1067
1068 memset(&cmsg, 0, sizeof(cmsg));
1069 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1070 /* Pick up a good active device number to send.
1071 */
1072 rdev_for_each(rdev, mddev)
1073 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
1074 raid_slot = rdev->desc_nr;
1075 break;
1076 }
1077 if (raid_slot >= 0) {
1078 cmsg.raid_slot = cpu_to_le32(raid_slot);
1079 ret = __sendmsg(cinfo, &cmsg);
1080 } else
1081 pr_warn("md-cluster: No good device id found to send\n");
1082 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1083 unlock_comm(cinfo);
1084 return ret;
1085}
1086
1087static void metadata_update_cancel(struct mddev *mddev)
1088{
1089 struct md_cluster_info *cinfo = mddev->cluster_info;
1090 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1091 unlock_comm(cinfo);
1092}
1093
1094/*
1095 * return 0 if all the bitmaps have the same sync_size
1096 */
1097static int cluster_check_sync_size(struct mddev *mddev)
1098{
1099 int i, rv;
1100 bitmap_super_t *sb;
1101 unsigned long my_sync_size, sync_size = 0;
1102 int node_num = mddev->bitmap_info.nodes;
1103 int current_slot = md_cluster_ops->slot_number(mddev);
1104 struct bitmap *bitmap = mddev->bitmap;
1105 char str[64];
1106 struct dlm_lock_resource *bm_lockres;
1107
1108 sb = kmap_atomic(bitmap->storage.sb_page);
1109 my_sync_size = sb->sync_size;
1110 kunmap_atomic(sb);
1111
1112 for (i = 0; i < node_num; i++) {
1113 if (i == current_slot)
1114 continue;
1115
1116 bitmap = get_bitmap_from_slot(mddev, i);
1117 if (IS_ERR(bitmap)) {
1118 pr_err("can't get bitmap from slot %d\n", i);
1119 return -1;
1120 }
1121
1122 /*
1123 * If we can hold the bitmap lock of one node then
1124 * the slot is not occupied, update the sb.
1125 */
1126 snprintf(str, 64, "bitmap%04d", i);
1127 bm_lockres = lockres_init(mddev, str, NULL, 1);
1128 if (!bm_lockres) {
1129 pr_err("md-cluster: Cannot initialize %s\n", str);
1130 bitmap_free(bitmap);
1131 return -1;
1132 }
1133 bm_lockres->flags |= DLM_LKF_NOQUEUE;
1134 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
1135 if (!rv)
1136 bitmap_update_sb(bitmap);
1137 lockres_free(bm_lockres);
1138
1139 sb = kmap_atomic(bitmap->storage.sb_page);
1140 if (sync_size == 0)
1141 sync_size = sb->sync_size;
1142 else if (sync_size != sb->sync_size) {
1143 kunmap_atomic(sb);
1144 bitmap_free(bitmap);
1145 return -1;
1146 }
1147 kunmap_atomic(sb);
1148 bitmap_free(bitmap);
1149 }
1150
1151 return (my_sync_size == sync_size) ? 0 : -1;
1152}
1153
1154/*
1155 * Update the size for cluster raid is a little more complex, we perform it
1156 * by the steps:
1157 * 1. hold token lock and update superblock in initiator node.
1158 * 2. send METADATA_UPDATED msg to other nodes.
1159 * 3. The initiator node continues to check each bitmap's sync_size, if all
1160 * bitmaps have the same value of sync_size, then we can set capacity and
1161 * let other nodes to perform it. If one node can't update sync_size
1162 * accordingly, we need to revert to previous value.
1163 */
1164static void update_size(struct mddev *mddev, sector_t old_dev_sectors)
1165{
1166 struct md_cluster_info *cinfo = mddev->cluster_info;
1167 struct cluster_msg cmsg;
1168 struct md_rdev *rdev;
1169 int ret = 0;
1170 int raid_slot = -1;
1171
1172 md_update_sb(mddev, 1);
1173 lock_comm(cinfo, 1);
1174
1175 memset(&cmsg, 0, sizeof(cmsg));
1176 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1177 rdev_for_each(rdev, mddev)
1178 if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) {
1179 raid_slot = rdev->desc_nr;
1180 break;
1181 }
1182 if (raid_slot >= 0) {
1183 cmsg.raid_slot = cpu_to_le32(raid_slot);
1184 /*
1185 * We can only change capiticy after all the nodes can do it,
1186 * so need to wait after other nodes already received the msg
1187 * and handled the change
1188 */
1189 ret = __sendmsg(cinfo, &cmsg);
1190 if (ret) {
1191 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1192 __func__, __LINE__);
1193 unlock_comm(cinfo);
1194 return;
1195 }
1196 } else {
1197 pr_err("md-cluster: No good device id found to send\n");
1198 unlock_comm(cinfo);
1199 return;
1200 }
1201
1202 /*
1203 * check the sync_size from other node's bitmap, if sync_size
1204 * have already updated in other nodes as expected, send an
1205 * empty metadata msg to permit the change of capacity
1206 */
1207 if (cluster_check_sync_size(mddev) == 0) {
1208 memset(&cmsg, 0, sizeof(cmsg));
1209 cmsg.type = cpu_to_le32(CHANGE_CAPACITY);
1210 ret = __sendmsg(cinfo, &cmsg);
1211 if (ret)
1212 pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n",
1213 __func__, __LINE__);
1214 set_capacity(mddev->gendisk, mddev->array_sectors);
1215 revalidate_disk(mddev->gendisk);
1216 } else {
1217 /* revert to previous sectors */
1218 ret = mddev->pers->resize(mddev, old_dev_sectors);
1219 if (!ret)
1220 revalidate_disk(mddev->gendisk);
1221 ret = __sendmsg(cinfo, &cmsg);
1222 if (ret)
1223 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1224 __func__, __LINE__);
1225 }
1226 unlock_comm(cinfo);
1227}
1228
1229static int resync_start(struct mddev *mddev)
1230{
1231 struct md_cluster_info *cinfo = mddev->cluster_info;
1232 return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev);
1233}
1234
1235static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
1236{
1237 struct md_cluster_info *cinfo = mddev->cluster_info;
1238 struct resync_info ri;
1239 struct cluster_msg cmsg = {0};
1240
1241 /* do not send zero again, if we have sent before */
1242 if (hi == 0) {
1243 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
1244 if (le64_to_cpu(ri.hi) == 0)
1245 return 0;
1246 }
1247
1248 add_resync_info(cinfo->bitmap_lockres, lo, hi);
1249 /* Re-acquire the lock to refresh LVB */
1250 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
1251 cmsg.type = cpu_to_le32(RESYNCING);
1252 cmsg.low = cpu_to_le64(lo);
1253 cmsg.high = cpu_to_le64(hi);
1254
1255 /*
1256 * mddev_lock is held if resync_info_update is called from
1257 * resync_finish (md_reap_sync_thread -> resync_finish)
1258 */
1259 if (lo == 0 && hi == 0)
1260 return sendmsg(cinfo, &cmsg, 1);
1261 else
1262 return sendmsg(cinfo, &cmsg, 0);
1263}
1264
1265static int resync_finish(struct mddev *mddev)
1266{
1267 struct md_cluster_info *cinfo = mddev->cluster_info;
1268 dlm_unlock_sync(cinfo->resync_lockres);
1269 return resync_info_update(mddev, 0, 0);
1270}
1271
1272static int area_resyncing(struct mddev *mddev, int direction,
1273 sector_t lo, sector_t hi)
1274{
1275 struct md_cluster_info *cinfo = mddev->cluster_info;
1276 int ret = 0;
1277 struct suspend_info *s;
1278
1279 if ((direction == READ) &&
1280 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
1281 return 1;
1282
1283 spin_lock_irq(&cinfo->suspend_lock);
1284 if (list_empty(&cinfo->suspend_list))
1285 goto out;
1286 list_for_each_entry(s, &cinfo->suspend_list, list)
1287 if (hi > s->lo && lo < s->hi) {
1288 ret = 1;
1289 break;
1290 }
1291out:
1292 spin_unlock_irq(&cinfo->suspend_lock);
1293 return ret;
1294}
1295
1296/* add_new_disk() - initiates a disk add
1297 * However, if this fails before writing md_update_sb(),
1298 * add_new_disk_cancel() must be called to release token lock
1299 */
1300static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
1301{
1302 struct md_cluster_info *cinfo = mddev->cluster_info;
1303 struct cluster_msg cmsg;
1304 int ret = 0;
1305 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1306 char *uuid = sb->device_uuid;
1307
1308 memset(&cmsg, 0, sizeof(cmsg));
1309 cmsg.type = cpu_to_le32(NEWDISK);
1310 memcpy(cmsg.uuid, uuid, 16);
1311 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1312 lock_comm(cinfo, 1);
1313 ret = __sendmsg(cinfo, &cmsg);
1314 if (ret) {
1315 unlock_comm(cinfo);
1316 return ret;
1317 }
1318 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
1319 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
1320 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
1321 /* Some node does not "see" the device */
1322 if (ret == -EAGAIN)
1323 ret = -ENOENT;
1324 if (ret)
1325 unlock_comm(cinfo);
1326 else {
1327 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
1328 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
1329 * will run soon after add_new_disk, the below path will be
1330 * invoked:
1331 * md_wakeup_thread(mddev->thread)
1332 * -> conf->thread (raid1d)
1333 * -> md_check_recovery -> md_update_sb
1334 * -> metadata_update_start/finish
1335 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
1336 *
1337 * For other failure cases, metadata_update_cancel and
1338 * add_new_disk_cancel also clear below bit as well.
1339 * */
1340 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1341 wake_up(&cinfo->wait);
1342 }
1343 return ret;
1344}
1345
1346static void add_new_disk_cancel(struct mddev *mddev)
1347{
1348 struct md_cluster_info *cinfo = mddev->cluster_info;
1349 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1350 unlock_comm(cinfo);
1351}
1352
1353static int new_disk_ack(struct mddev *mddev, bool ack)
1354{
1355 struct md_cluster_info *cinfo = mddev->cluster_info;
1356
1357 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
1358 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
1359 return -EINVAL;
1360 }
1361
1362 if (ack)
1363 dlm_unlock_sync(cinfo->no_new_dev_lockres);
1364 complete(&cinfo->newdisk_completion);
1365 return 0;
1366}
1367
1368static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
1369{
1370 struct cluster_msg cmsg = {0};
1371 struct md_cluster_info *cinfo = mddev->cluster_info;
1372 cmsg.type = cpu_to_le32(REMOVE);
1373 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1374 return sendmsg(cinfo, &cmsg, 1);
1375}
1376
1377static int lock_all_bitmaps(struct mddev *mddev)
1378{
1379 int slot, my_slot, ret, held = 1, i = 0;
1380 char str[64];
1381 struct md_cluster_info *cinfo = mddev->cluster_info;
1382
1383 cinfo->other_bitmap_lockres = kzalloc((mddev->bitmap_info.nodes - 1) *
1384 sizeof(struct dlm_lock_resource *),
1385 GFP_KERNEL);
1386 if (!cinfo->other_bitmap_lockres) {
1387 pr_err("md: can't alloc mem for other bitmap locks\n");
1388 return 0;
1389 }
1390
1391 my_slot = slot_number(mddev);
1392 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
1393 if (slot == my_slot)
1394 continue;
1395
1396 memset(str, '\0', 64);
1397 snprintf(str, 64, "bitmap%04d", slot);
1398 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
1399 if (!cinfo->other_bitmap_lockres[i])
1400 return -ENOMEM;
1401
1402 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
1403 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
1404 if (ret)
1405 held = -1;
1406 i++;
1407 }
1408
1409 return held;
1410}
1411
1412static void unlock_all_bitmaps(struct mddev *mddev)
1413{
1414 struct md_cluster_info *cinfo = mddev->cluster_info;
1415 int i;
1416
1417 /* release other node's bitmap lock if they are existed */
1418 if (cinfo->other_bitmap_lockres) {
1419 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
1420 if (cinfo->other_bitmap_lockres[i]) {
1421 lockres_free(cinfo->other_bitmap_lockres[i]);
1422 }
1423 }
1424 kfree(cinfo->other_bitmap_lockres);
1425 }
1426}
1427
1428static int gather_bitmaps(struct md_rdev *rdev)
1429{
1430 int sn, err;
1431 sector_t lo, hi;
1432 struct cluster_msg cmsg = {0};
1433 struct mddev *mddev = rdev->mddev;
1434 struct md_cluster_info *cinfo = mddev->cluster_info;
1435
1436 cmsg.type = cpu_to_le32(RE_ADD);
1437 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1438 err = sendmsg(cinfo, &cmsg, 1);
1439 if (err)
1440 goto out;
1441
1442 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1443 if (sn == (cinfo->slot_number - 1))
1444 continue;
1445 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
1446 if (err) {
1447 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1448 goto out;
1449 }
1450 if ((hi > 0) && (lo < mddev->recovery_cp))
1451 mddev->recovery_cp = lo;
1452 }
1453out:
1454 return err;
1455}
1456
1457static struct md_cluster_operations cluster_ops = {
1458 .join = join,
1459 .leave = leave,
1460 .slot_number = slot_number,
1461 .resync_start = resync_start,
1462 .resync_finish = resync_finish,
1463 .resync_info_update = resync_info_update,
1464 .metadata_update_start = metadata_update_start,
1465 .metadata_update_finish = metadata_update_finish,
1466 .metadata_update_cancel = metadata_update_cancel,
1467 .area_resyncing = area_resyncing,
1468 .add_new_disk = add_new_disk,
1469 .add_new_disk_cancel = add_new_disk_cancel,
1470 .new_disk_ack = new_disk_ack,
1471 .remove_disk = remove_disk,
1472 .load_bitmaps = load_bitmaps,
1473 .gather_bitmaps = gather_bitmaps,
1474 .lock_all_bitmaps = lock_all_bitmaps,
1475 .unlock_all_bitmaps = unlock_all_bitmaps,
1476 .update_size = update_size,
1477};
1478
1479static int __init cluster_init(void)
1480{
1481 pr_warn("md-cluster: support raid1 and raid10 (limited support)\n");
1482 pr_info("Registering Cluster MD functions\n");
1483 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
1484 return 0;
1485}
1486
1487static void cluster_exit(void)
1488{
1489 unregister_md_cluster_operations();
1490}
1491
1492module_init(cluster_init);
1493module_exit(cluster_exit);
1494MODULE_AUTHOR("SUSE");
1495MODULE_LICENSE("GPL");
1496MODULE_DESCRIPTION("Clustering support for MD");