2 * Copyright (C) 2015, SUSE
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)
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>
18 #include "md-bitmap.h"
19 #include "md-cluster.h"
22 #define NEW_DEV_TIMEOUT 5000
24 struct dlm_lock_resource {
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. */
41 /* md_cluster_info flags */
42 #define MD_CLUSTER_WAITING_FOR_NEWDISK 1
43 #define MD_CLUSTER_SUSPEND_READ_BALANCING 2
44 #define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
46 /* Lock the send communication. This is done through
47 * bit manipulation as opposed to a mutex in order to
48 * accomodate lock and hold. See next comment.
50 #define MD_CLUSTER_SEND_LOCK 4
51 /* If cluster operations (such as adding a disk) must lock the
52 * communication channel, so as to perform extra operations
53 * (update metadata) and no other operation is allowed on the
54 * MD. Token needs to be locked and held until the operation
55 * completes witha md_update_sb(), which would eventually release
58 #define MD_CLUSTER_SEND_LOCKED_ALREADY 5
59 /* We should receive message after node joined cluster and
60 * set up all the related infos such as bitmap and personality */
61 #define MD_CLUSTER_ALREADY_IN_CLUSTER 6
62 #define MD_CLUSTER_PENDING_RECV_EVENT 7
63 #define MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD 8
65 struct md_cluster_info {
66 struct mddev *mddev; /* the md device which md_cluster_info belongs to */
67 /* dlm lock space and resources for clustered raid. */
68 dlm_lockspace_t *lockspace;
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;
77 spinlock_t suspend_lock;
78 /* record the region which write should be suspended */
81 int suspend_from; /* the slot which broadcast suspend_lo/hi */
83 struct md_thread *recovery_thread;
84 unsigned long recovery_map;
85 /* communication loc resources */
86 struct dlm_lock_resource *ack_lockres;
87 struct dlm_lock_resource *message_lockres;
88 struct dlm_lock_resource *token_lockres;
89 struct dlm_lock_resource *no_new_dev_lockres;
90 struct md_thread *recv_thread;
91 struct completion newdisk_completion;
92 wait_queue_head_t wait;
94 /* record the region in RESYNCING message */
100 METADATA_UPDATED = 0,
113 /* TODO: Unionize this for smaller footprint */
120 static void sync_ast(void *arg)
122 struct dlm_lock_resource *res;
125 res->sync_locking_done = true;
126 wake_up(&res->sync_locking);
129 static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
133 ret = dlm_lock(res->ls, mode, &res->lksb,
134 res->flags, res->name, strlen(res->name),
135 0, sync_ast, res, res->bast);
138 wait_event(res->sync_locking, res->sync_locking_done);
139 res->sync_locking_done = false;
140 if (res->lksb.sb_status == 0)
142 return res->lksb.sb_status;
145 static int dlm_unlock_sync(struct dlm_lock_resource *res)
147 return dlm_lock_sync(res, DLM_LOCK_NL);
151 * An variation of dlm_lock_sync, which make lock request could
154 static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode,
159 ret = dlm_lock(res->ls, mode, &res->lksb,
160 res->flags, res->name, strlen(res->name),
161 0, sync_ast, res, res->bast);
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) {
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
174 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL,
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);
182 res->sync_locking_done = false;
183 if (res->lksb.sb_status == 0)
185 return res->lksb.sb_status;
188 static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
189 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
191 struct dlm_lock_resource *res = NULL;
193 struct md_cluster_info *cinfo = mddev->cluster_info;
195 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
198 init_waitqueue_head(&res->sync_locking);
199 res->sync_locking_done = false;
200 res->ls = cinfo->lockspace;
202 res->mode = DLM_LOCK_IV;
203 namelen = strlen(name);
204 res->name = kzalloc(namelen + 1, GFP_KERNEL);
206 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
209 strlcpy(res->name, name, namelen + 1);
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);
216 res->flags = DLM_LKF_VALBLK;
222 res->flags |= DLM_LKF_EXPEDITE;
224 ret = dlm_lock_sync(res, DLM_LOCK_NL);
226 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
229 res->flags &= ~DLM_LKF_EXPEDITE;
230 res->flags |= DLM_LKF_CONVERT;
234 kfree(res->lksb.sb_lvbptr);
240 static void lockres_free(struct dlm_lock_resource *res)
248 * use FORCEUNLOCK flag, so we can unlock even the lock is on the
249 * waiting or convert queue
251 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK,
253 if (unlikely(ret != 0))
254 pr_err("failed to unlock %s return %d\n", res->name, ret);
256 wait_event(res->sync_locking, res->sync_locking_done);
259 kfree(res->lksb.sb_lvbptr);
263 static void add_resync_info(struct dlm_lock_resource *lockres,
264 sector_t lo, sector_t hi)
266 struct resync_info *ri;
268 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
269 ri->lo = cpu_to_le64(lo);
270 ri->hi = cpu_to_le64(hi);
273 static int read_resync_info(struct mddev *mddev,
274 struct dlm_lock_resource *lockres)
276 struct resync_info ri;
277 struct md_cluster_info *cinfo = mddev->cluster_info;
280 dlm_lock_sync(lockres, DLM_LOCK_CR);
281 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
282 if (le64_to_cpu(ri.hi) > 0) {
283 cinfo->suspend_hi = le64_to_cpu(ri.hi);
284 cinfo->suspend_lo = le64_to_cpu(ri.lo);
287 dlm_unlock_sync(lockres);
291 static void recover_bitmaps(struct md_thread *thread)
293 struct mddev *mddev = thread->mddev;
294 struct md_cluster_info *cinfo = mddev->cluster_info;
295 struct dlm_lock_resource *bm_lockres;
300 while (cinfo->recovery_map) {
301 slot = fls64((u64)cinfo->recovery_map) - 1;
303 snprintf(str, 64, "bitmap%04d", slot);
304 bm_lockres = lockres_init(mddev, str, NULL, 1);
306 pr_err("md-cluster: Cannot initialize bitmaps\n");
310 ret = dlm_lock_sync_interruptible(bm_lockres, DLM_LOCK_PW, mddev);
312 pr_err("md-cluster: Could not DLM lock %s: %d\n",
316 ret = md_bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
318 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
322 /* Clear suspend_area associated with the bitmap */
323 spin_lock_irq(&cinfo->suspend_lock);
324 cinfo->suspend_hi = 0;
325 cinfo->suspend_lo = 0;
326 cinfo->suspend_from = -1;
327 spin_unlock_irq(&cinfo->suspend_lock);
329 /* Kick off a reshape if needed */
330 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
331 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
332 mddev->reshape_position != MaxSector)
333 md_wakeup_thread(mddev->sync_thread);
336 if (lo < mddev->recovery_cp)
337 mddev->recovery_cp = lo;
338 /* wake up thread to continue resync in case resync
340 if (mddev->recovery_cp != MaxSector) {
342 * clear the REMOTE flag since we will launch
343 * resync thread in current node.
345 clear_bit(MD_RESYNCING_REMOTE,
347 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
348 md_wakeup_thread(mddev->thread);
352 lockres_free(bm_lockres);
353 clear_bit(slot, &cinfo->recovery_map);
357 static void recover_prep(void *arg)
359 struct mddev *mddev = arg;
360 struct md_cluster_info *cinfo = mddev->cluster_info;
361 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
364 static void __recover_slot(struct mddev *mddev, int slot)
366 struct md_cluster_info *cinfo = mddev->cluster_info;
368 set_bit(slot, &cinfo->recovery_map);
369 if (!cinfo->recovery_thread) {
370 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
372 if (!cinfo->recovery_thread) {
373 pr_warn("md-cluster: Could not create recovery thread\n");
377 md_wakeup_thread(cinfo->recovery_thread);
380 static void recover_slot(void *arg, struct dlm_slot *slot)
382 struct mddev *mddev = arg;
383 struct md_cluster_info *cinfo = mddev->cluster_info;
385 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
386 mddev->bitmap_info.cluster_name,
387 slot->nodeid, slot->slot,
389 /* deduct one since dlm slot starts from one while the num of
390 * cluster-md begins with 0 */
391 __recover_slot(mddev, slot->slot - 1);
394 static void recover_done(void *arg, struct dlm_slot *slots,
395 int num_slots, int our_slot,
398 struct mddev *mddev = arg;
399 struct md_cluster_info *cinfo = mddev->cluster_info;
401 cinfo->slot_number = our_slot;
402 /* completion is only need to be complete when node join cluster,
403 * it doesn't need to run during another node's failure */
404 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
405 complete(&cinfo->completion);
406 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
408 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
411 /* the ops is called when node join the cluster, and do lock recovery
412 * if node failure occurs */
413 static const struct dlm_lockspace_ops md_ls_ops = {
414 .recover_prep = recover_prep,
415 .recover_slot = recover_slot,
416 .recover_done = recover_done,
420 * The BAST function for the ack lock resource
421 * This function wakes up the receive thread in
422 * order to receive and process the message.
424 static void ack_bast(void *arg, int mode)
426 struct dlm_lock_resource *res = arg;
427 struct md_cluster_info *cinfo = res->mddev->cluster_info;
429 if (mode == DLM_LOCK_EX) {
430 if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state))
431 md_wakeup_thread(cinfo->recv_thread);
433 set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state);
437 static void remove_suspend_info(struct mddev *mddev, int slot)
439 struct md_cluster_info *cinfo = mddev->cluster_info;
440 mddev->pers->quiesce(mddev, 1);
441 spin_lock_irq(&cinfo->suspend_lock);
442 cinfo->suspend_hi = 0;
443 cinfo->suspend_lo = 0;
444 spin_unlock_irq(&cinfo->suspend_lock);
445 mddev->pers->quiesce(mddev, 0);
448 static void process_suspend_info(struct mddev *mddev,
449 int slot, sector_t lo, sector_t hi)
451 struct md_cluster_info *cinfo = mddev->cluster_info;
452 struct mdp_superblock_1 *sb = NULL;
453 struct md_rdev *rdev;
457 * clear the REMOTE flag since resync or recovery is finished
460 clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
461 remove_suspend_info(mddev, slot);
462 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
463 md_wakeup_thread(mddev->thread);
467 rdev_for_each(rdev, mddev)
468 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
469 sb = page_address(rdev->sb_page);
474 * The bitmaps are not same for different nodes
475 * if RESYNCING is happening in one node, then
476 * the node which received the RESYNCING message
477 * probably will perform resync with the region
478 * [lo, hi] again, so we could reduce resync time
479 * a lot if we can ensure that the bitmaps among
480 * different nodes are match up well.
482 * sync_low/hi is used to record the region which
483 * arrived in the previous RESYNCING message,
485 * Call md_bitmap_sync_with_cluster to clear NEEDED_MASK
486 * and set RESYNC_MASK since resync thread is running
487 * in another node, so we don't need to do the resync
488 * again with the same section.
490 * Skip md_bitmap_sync_with_cluster in case reshape
491 * happening, because reshaping region is small and
492 * we don't want to trigger lots of WARN.
494 if (sb && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE))
495 md_bitmap_sync_with_cluster(mddev, cinfo->sync_low,
496 cinfo->sync_hi, lo, hi);
497 cinfo->sync_low = lo;
500 mddev->pers->quiesce(mddev, 1);
501 spin_lock_irq(&cinfo->suspend_lock);
502 cinfo->suspend_from = slot;
503 cinfo->suspend_lo = lo;
504 cinfo->suspend_hi = hi;
505 spin_unlock_irq(&cinfo->suspend_lock);
506 mddev->pers->quiesce(mddev, 0);
509 static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
512 struct md_cluster_info *cinfo = mddev->cluster_info;
513 char event_name[] = "EVENT=ADD_DEVICE";
515 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
518 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
519 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
520 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
521 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
522 init_completion(&cinfo->newdisk_completion);
523 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
524 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
525 wait_for_completion_timeout(&cinfo->newdisk_completion,
527 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
531 static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
534 struct md_cluster_info *cinfo = mddev->cluster_info;
535 mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
537 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
538 wait_event(mddev->thread->wqueue,
539 (got_lock = mddev_trylock(mddev)) ||
540 test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state));
541 md_reload_sb(mddev, mddev->good_device_nr);
546 static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
548 struct md_rdev *rdev;
551 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
553 set_bit(ClusterRemove, &rdev->flags);
554 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
555 md_wakeup_thread(mddev->thread);
558 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
559 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
563 static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
565 struct md_rdev *rdev;
568 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
569 if (rdev && test_bit(Faulty, &rdev->flags))
570 clear_bit(Faulty, &rdev->flags);
572 pr_warn("%s: %d Could not find disk(%d) which is faulty",
573 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
577 static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
581 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
582 "node %d received it's own msg\n", le32_to_cpu(msg->slot)))
584 switch (le32_to_cpu(msg->type)) {
585 case METADATA_UPDATED:
586 process_metadata_update(mddev, msg);
588 case CHANGE_CAPACITY:
589 set_capacity(mddev->gendisk, mddev->array_sectors);
590 revalidate_disk(mddev->gendisk);
593 set_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
594 process_suspend_info(mddev, le32_to_cpu(msg->slot),
595 le64_to_cpu(msg->low),
596 le64_to_cpu(msg->high));
599 process_add_new_disk(mddev, msg);
602 process_remove_disk(mddev, msg);
605 process_readd_disk(mddev, msg);
607 case BITMAP_NEEDS_SYNC:
608 __recover_slot(mddev, le32_to_cpu(msg->slot));
611 if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0))
612 ret = md_bitmap_resize(mddev->bitmap,
613 le64_to_cpu(msg->high), 0, 0);
617 pr_warn("%s:%d Received unknown message from %d\n",
618 __func__, __LINE__, msg->slot);
624 * thread for receiving message
626 static void recv_daemon(struct md_thread *thread)
628 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
629 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
630 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
631 struct cluster_msg msg;
634 mutex_lock(&cinfo->recv_mutex);
635 /*get CR on Message*/
636 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
637 pr_err("md/raid1:failed to get CR on MESSAGE\n");
638 mutex_unlock(&cinfo->recv_mutex);
642 /* read lvb and wake up thread to process this message_lockres */
643 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
644 ret = process_recvd_msg(thread->mddev, &msg);
648 /*release CR on ack_lockres*/
649 ret = dlm_unlock_sync(ack_lockres);
650 if (unlikely(ret != 0))
651 pr_info("unlock ack failed return %d\n", ret);
652 /*up-convert to PR on message_lockres*/
653 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
654 if (unlikely(ret != 0))
655 pr_info("lock PR on msg failed return %d\n", ret);
656 /*get CR on ack_lockres again*/
657 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
658 if (unlikely(ret != 0))
659 pr_info("lock CR on ack failed return %d\n", ret);
661 /*release CR on message_lockres*/
662 ret = dlm_unlock_sync(message_lockres);
663 if (unlikely(ret != 0))
664 pr_info("unlock msg failed return %d\n", ret);
665 mutex_unlock(&cinfo->recv_mutex);
669 * Takes the lock on the TOKEN lock resource so no other
670 * node can communicate while the operation is underway.
672 static int lock_token(struct md_cluster_info *cinfo, bool mddev_locked)
674 int error, set_bit = 0;
675 struct mddev *mddev = cinfo->mddev;
678 * If resync thread run after raid1d thread, then process_metadata_update
679 * could not continue if raid1d held reconfig_mutex (and raid1d is blocked
680 * since another node already got EX on Token and waitting the EX of Ack),
681 * so let resync wake up thread in case flag is set.
683 if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
685 error = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
688 md_wakeup_thread(mddev->thread);
691 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
693 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
696 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
697 __func__, __LINE__, error);
699 /* Lock the receive sequence */
700 mutex_lock(&cinfo->recv_mutex);
705 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
707 static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked)
709 wait_event(cinfo->wait,
710 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
712 return lock_token(cinfo, mddev_locked);
715 static void unlock_comm(struct md_cluster_info *cinfo)
717 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
718 mutex_unlock(&cinfo->recv_mutex);
719 dlm_unlock_sync(cinfo->token_lockres);
720 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
721 wake_up(&cinfo->wait);
725 * This function performs the actual sending of the message. This function is
726 * usually called after performing the encompassing operation
728 * 1. Grabs the message lockresource in EX mode
729 * 2. Copies the message to the message LVB
730 * 3. Downconverts message lockresource to CW
731 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
732 * and the other nodes read the message. The thread will wait here until all other
733 * nodes have released ack lock resource.
734 * 5. Downconvert ack lockresource to CR
736 static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
739 int slot = cinfo->slot_number - 1;
741 cmsg->slot = cpu_to_le32(slot);
742 /*get EX on Message*/
743 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
745 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
749 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
750 sizeof(struct cluster_msg));
751 /*down-convert EX to CW on Message*/
752 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
754 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
759 /*up-convert CR to EX on Ack*/
760 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
762 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
767 /*down-convert EX to CR on Ack*/
768 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
770 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
776 error = dlm_unlock_sync(cinfo->message_lockres);
777 if (unlikely(error != 0)) {
778 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
780 /* in case the message can't be released due to some reason */
787 static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg,
792 lock_comm(cinfo, mddev_locked);
793 ret = __sendmsg(cinfo, cmsg);
798 static int gather_all_resync_info(struct mddev *mddev, int total_slots)
800 struct md_cluster_info *cinfo = mddev->cluster_info;
802 struct dlm_lock_resource *bm_lockres;
807 for (i = 0; i < total_slots; i++) {
808 memset(str, '\0', 64);
809 snprintf(str, 64, "bitmap%04d", i);
810 bm_lockres = lockres_init(mddev, str, NULL, 1);
813 if (i == (cinfo->slot_number - 1)) {
814 lockres_free(bm_lockres);
818 bm_lockres->flags |= DLM_LKF_NOQUEUE;
819 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
820 if (ret == -EAGAIN) {
821 if (read_resync_info(mddev, bm_lockres)) {
822 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
824 (unsigned long long) cinfo->suspend_lo,
825 (unsigned long long) cinfo->suspend_hi,
827 cinfo->suspend_from = i;
830 lockres_free(bm_lockres);
834 lockres_free(bm_lockres);
838 /* Read the disk bitmap sb and check if it needs recovery */
839 ret = md_bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
841 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
842 lockres_free(bm_lockres);
845 if ((hi > 0) && (lo < mddev->recovery_cp)) {
846 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
847 mddev->recovery_cp = lo;
848 md_check_recovery(mddev);
851 lockres_free(bm_lockres);
857 static int join(struct mddev *mddev, int nodes)
859 struct md_cluster_info *cinfo;
863 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
867 INIT_LIST_HEAD(&cinfo->suspend_list);
868 spin_lock_init(&cinfo->suspend_lock);
869 init_completion(&cinfo->completion);
870 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
871 init_waitqueue_head(&cinfo->wait);
872 mutex_init(&cinfo->recv_mutex);
874 mddev->cluster_info = cinfo;
875 cinfo->mddev = mddev;
878 sprintf(str, "%pU", mddev->uuid);
879 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
880 DLM_LSFL_FS, LVB_SIZE,
881 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
884 wait_for_completion(&cinfo->completion);
885 if (nodes < cinfo->slot_number) {
886 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
887 cinfo->slot_number, nodes);
891 /* Initiate the communication resources */
893 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
894 if (!cinfo->recv_thread) {
895 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
898 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
899 if (!cinfo->message_lockres)
901 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
902 if (!cinfo->token_lockres)
904 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
905 if (!cinfo->no_new_dev_lockres)
908 ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
911 pr_err("md-cluster: can't join cluster to avoid lock issue\n");
914 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
915 if (!cinfo->ack_lockres) {
919 /* get sync CR lock on ACK. */
920 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
921 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
923 dlm_unlock_sync(cinfo->token_lockres);
924 /* get sync CR lock on no-new-dev. */
925 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
926 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
929 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
930 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
931 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
932 if (!cinfo->bitmap_lockres) {
936 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
937 pr_err("Failed to get bitmap lock\n");
942 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
943 if (!cinfo->resync_lockres) {
950 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
951 md_unregister_thread(&cinfo->recovery_thread);
952 md_unregister_thread(&cinfo->recv_thread);
953 lockres_free(cinfo->message_lockres);
954 lockres_free(cinfo->token_lockres);
955 lockres_free(cinfo->ack_lockres);
956 lockres_free(cinfo->no_new_dev_lockres);
957 lockres_free(cinfo->resync_lockres);
958 lockres_free(cinfo->bitmap_lockres);
959 if (cinfo->lockspace)
960 dlm_release_lockspace(cinfo->lockspace, 2);
961 mddev->cluster_info = NULL;
966 static void load_bitmaps(struct mddev *mddev, int total_slots)
968 struct md_cluster_info *cinfo = mddev->cluster_info;
970 /* load all the node's bitmap info for resync */
971 if (gather_all_resync_info(mddev, total_slots))
972 pr_err("md-cluster: failed to gather all resyn infos\n");
973 set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state);
974 /* wake up recv thread in case something need to be handled */
975 if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state))
976 md_wakeup_thread(cinfo->recv_thread);
979 static void resync_bitmap(struct mddev *mddev)
981 struct md_cluster_info *cinfo = mddev->cluster_info;
982 struct cluster_msg cmsg = {0};
985 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
986 err = sendmsg(cinfo, &cmsg, 1);
988 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
989 __func__, __LINE__, err);
992 static void unlock_all_bitmaps(struct mddev *mddev);
993 static int leave(struct mddev *mddev)
995 struct md_cluster_info *cinfo = mddev->cluster_info;
1001 * BITMAP_NEEDS_SYNC message should be sent when node
1002 * is leaving the cluster with dirty bitmap, also we
1003 * can only deliver it when dlm connection is available.
1005 * Also, we should send BITMAP_NEEDS_SYNC message in
1006 * case reshaping is interrupted.
1008 if ((cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector) ||
1009 (mddev->reshape_position != MaxSector &&
1010 test_bit(MD_CLOSING, &mddev->flags)))
1011 resync_bitmap(mddev);
1013 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1014 md_unregister_thread(&cinfo->recovery_thread);
1015 md_unregister_thread(&cinfo->recv_thread);
1016 lockres_free(cinfo->message_lockres);
1017 lockres_free(cinfo->token_lockres);
1018 lockres_free(cinfo->ack_lockres);
1019 lockres_free(cinfo->no_new_dev_lockres);
1020 lockres_free(cinfo->resync_lockres);
1021 lockres_free(cinfo->bitmap_lockres);
1022 unlock_all_bitmaps(mddev);
1023 dlm_release_lockspace(cinfo->lockspace, 2);
1028 /* slot_number(): Returns the MD slot number to use
1029 * DLM starts the slot numbers from 1, wheras cluster-md
1030 * wants the number to be from zero, so we deduct one
1032 static int slot_number(struct mddev *mddev)
1034 struct md_cluster_info *cinfo = mddev->cluster_info;
1036 return cinfo->slot_number - 1;
1040 * Check if the communication is already locked, else lock the communication
1042 * If it is already locked, token is in EX mode, and hence lock_token()
1043 * should not be called.
1045 static int metadata_update_start(struct mddev *mddev)
1047 struct md_cluster_info *cinfo = mddev->cluster_info;
1051 * metadata_update_start is always called with the protection of
1052 * reconfig_mutex, so set WAITING_FOR_TOKEN here.
1054 ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
1057 md_wakeup_thread(mddev->thread);
1059 wait_event(cinfo->wait,
1060 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
1061 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
1063 /* If token is already locked, return 0 */
1064 if (cinfo->token_lockres->mode == DLM_LOCK_EX) {
1065 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1069 ret = lock_token(cinfo, 1);
1070 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1074 static int metadata_update_finish(struct mddev *mddev)
1076 struct md_cluster_info *cinfo = mddev->cluster_info;
1077 struct cluster_msg cmsg;
1078 struct md_rdev *rdev;
1082 memset(&cmsg, 0, sizeof(cmsg));
1083 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1084 /* Pick up a good active device number to send.
1086 rdev_for_each(rdev, mddev)
1087 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
1088 raid_slot = rdev->desc_nr;
1091 if (raid_slot >= 0) {
1092 cmsg.raid_slot = cpu_to_le32(raid_slot);
1093 ret = __sendmsg(cinfo, &cmsg);
1095 pr_warn("md-cluster: No good device id found to send\n");
1096 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1101 static void metadata_update_cancel(struct mddev *mddev)
1103 struct md_cluster_info *cinfo = mddev->cluster_info;
1104 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1108 static int update_bitmap_size(struct mddev *mddev, sector_t size)
1110 struct md_cluster_info *cinfo = mddev->cluster_info;
1111 struct cluster_msg cmsg = {0};
1114 cmsg.type = cpu_to_le32(BITMAP_RESIZE);
1115 cmsg.high = cpu_to_le64(size);
1116 ret = sendmsg(cinfo, &cmsg, 0);
1118 pr_err("%s:%d: failed to send BITMAP_RESIZE message (%d)\n",
1119 __func__, __LINE__, ret);
1123 static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize)
1125 struct bitmap_counts *counts;
1127 struct dlm_lock_resource *bm_lockres;
1128 struct bitmap *bitmap = mddev->bitmap;
1129 unsigned long my_pages = bitmap->counts.pages;
1133 * We need to ensure all the nodes can grow to a larger
1134 * bitmap size before make the reshaping.
1136 rv = update_bitmap_size(mddev, newsize);
1140 for (i = 0; i < mddev->bitmap_info.nodes; i++) {
1141 if (i == md_cluster_ops->slot_number(mddev))
1144 bitmap = get_bitmap_from_slot(mddev, i);
1145 if (IS_ERR(bitmap)) {
1146 pr_err("can't get bitmap from slot %d\n", i);
1149 counts = &bitmap->counts;
1152 * If we can hold the bitmap lock of one node then
1153 * the slot is not occupied, update the pages.
1155 snprintf(str, 64, "bitmap%04d", i);
1156 bm_lockres = lockres_init(mddev, str, NULL, 1);
1158 pr_err("Cannot initialize %s lock\n", str);
1161 bm_lockres->flags |= DLM_LKF_NOQUEUE;
1162 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
1164 counts->pages = my_pages;
1165 lockres_free(bm_lockres);
1167 if (my_pages != counts->pages)
1169 * Let's revert the bitmap size if one node
1170 * can't resize bitmap
1177 md_bitmap_free(bitmap);
1178 update_bitmap_size(mddev, oldsize);
1183 * return 0 if all the bitmaps have the same sync_size
1185 static int cluster_check_sync_size(struct mddev *mddev)
1189 unsigned long my_sync_size, sync_size = 0;
1190 int node_num = mddev->bitmap_info.nodes;
1191 int current_slot = md_cluster_ops->slot_number(mddev);
1192 struct bitmap *bitmap = mddev->bitmap;
1194 struct dlm_lock_resource *bm_lockres;
1196 sb = kmap_atomic(bitmap->storage.sb_page);
1197 my_sync_size = sb->sync_size;
1200 for (i = 0; i < node_num; i++) {
1201 if (i == current_slot)
1204 bitmap = get_bitmap_from_slot(mddev, i);
1205 if (IS_ERR(bitmap)) {
1206 pr_err("can't get bitmap from slot %d\n", i);
1211 * If we can hold the bitmap lock of one node then
1212 * the slot is not occupied, update the sb.
1214 snprintf(str, 64, "bitmap%04d", i);
1215 bm_lockres = lockres_init(mddev, str, NULL, 1);
1217 pr_err("md-cluster: Cannot initialize %s\n", str);
1218 md_bitmap_free(bitmap);
1221 bm_lockres->flags |= DLM_LKF_NOQUEUE;
1222 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
1224 md_bitmap_update_sb(bitmap);
1225 lockres_free(bm_lockres);
1227 sb = kmap_atomic(bitmap->storage.sb_page);
1229 sync_size = sb->sync_size;
1230 else if (sync_size != sb->sync_size) {
1232 md_bitmap_free(bitmap);
1236 md_bitmap_free(bitmap);
1239 return (my_sync_size == sync_size) ? 0 : -1;
1243 * Update the size for cluster raid is a little more complex, we perform it
1245 * 1. hold token lock and update superblock in initiator node.
1246 * 2. send METADATA_UPDATED msg to other nodes.
1247 * 3. The initiator node continues to check each bitmap's sync_size, if all
1248 * bitmaps have the same value of sync_size, then we can set capacity and
1249 * let other nodes to perform it. If one node can't update sync_size
1250 * accordingly, we need to revert to previous value.
1252 static void update_size(struct mddev *mddev, sector_t old_dev_sectors)
1254 struct md_cluster_info *cinfo = mddev->cluster_info;
1255 struct cluster_msg cmsg;
1256 struct md_rdev *rdev;
1260 md_update_sb(mddev, 1);
1261 lock_comm(cinfo, 1);
1263 memset(&cmsg, 0, sizeof(cmsg));
1264 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1265 rdev_for_each(rdev, mddev)
1266 if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) {
1267 raid_slot = rdev->desc_nr;
1270 if (raid_slot >= 0) {
1271 cmsg.raid_slot = cpu_to_le32(raid_slot);
1273 * We can only change capiticy after all the nodes can do it,
1274 * so need to wait after other nodes already received the msg
1275 * and handled the change
1277 ret = __sendmsg(cinfo, &cmsg);
1279 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1280 __func__, __LINE__);
1285 pr_err("md-cluster: No good device id found to send\n");
1291 * check the sync_size from other node's bitmap, if sync_size
1292 * have already updated in other nodes as expected, send an
1293 * empty metadata msg to permit the change of capacity
1295 if (cluster_check_sync_size(mddev) == 0) {
1296 memset(&cmsg, 0, sizeof(cmsg));
1297 cmsg.type = cpu_to_le32(CHANGE_CAPACITY);
1298 ret = __sendmsg(cinfo, &cmsg);
1300 pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n",
1301 __func__, __LINE__);
1302 set_capacity(mddev->gendisk, mddev->array_sectors);
1303 revalidate_disk(mddev->gendisk);
1305 /* revert to previous sectors */
1306 ret = mddev->pers->resize(mddev, old_dev_sectors);
1308 revalidate_disk(mddev->gendisk);
1309 ret = __sendmsg(cinfo, &cmsg);
1311 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1312 __func__, __LINE__);
1317 static int resync_start(struct mddev *mddev)
1319 struct md_cluster_info *cinfo = mddev->cluster_info;
1320 return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev);
1323 static void resync_info_get(struct mddev *mddev, sector_t *lo, sector_t *hi)
1325 struct md_cluster_info *cinfo = mddev->cluster_info;
1327 spin_lock_irq(&cinfo->suspend_lock);
1328 *lo = cinfo->suspend_lo;
1329 *hi = cinfo->suspend_hi;
1330 spin_unlock_irq(&cinfo->suspend_lock);
1333 static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
1335 struct md_cluster_info *cinfo = mddev->cluster_info;
1336 struct resync_info ri;
1337 struct cluster_msg cmsg = {0};
1339 /* do not send zero again, if we have sent before */
1341 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
1342 if (le64_to_cpu(ri.hi) == 0)
1346 add_resync_info(cinfo->bitmap_lockres, lo, hi);
1347 /* Re-acquire the lock to refresh LVB */
1348 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
1349 cmsg.type = cpu_to_le32(RESYNCING);
1350 cmsg.low = cpu_to_le64(lo);
1351 cmsg.high = cpu_to_le64(hi);
1354 * mddev_lock is held if resync_info_update is called from
1355 * resync_finish (md_reap_sync_thread -> resync_finish)
1357 if (lo == 0 && hi == 0)
1358 return sendmsg(cinfo, &cmsg, 1);
1360 return sendmsg(cinfo, &cmsg, 0);
1363 static int resync_finish(struct mddev *mddev)
1365 struct md_cluster_info *cinfo = mddev->cluster_info;
1368 clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
1371 * If resync thread is interrupted so we can't say resync is finished,
1372 * another node will launch resync thread to continue.
1374 if (!test_bit(MD_CLOSING, &mddev->flags))
1375 ret = resync_info_update(mddev, 0, 0);
1376 dlm_unlock_sync(cinfo->resync_lockres);
1380 static int area_resyncing(struct mddev *mddev, int direction,
1381 sector_t lo, sector_t hi)
1383 struct md_cluster_info *cinfo = mddev->cluster_info;
1386 if ((direction == READ) &&
1387 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
1390 spin_lock_irq(&cinfo->suspend_lock);
1391 if (hi > cinfo->suspend_lo && lo < cinfo->suspend_hi)
1393 spin_unlock_irq(&cinfo->suspend_lock);
1397 /* add_new_disk() - initiates a disk add
1398 * However, if this fails before writing md_update_sb(),
1399 * add_new_disk_cancel() must be called to release token lock
1401 static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
1403 struct md_cluster_info *cinfo = mddev->cluster_info;
1404 struct cluster_msg cmsg;
1406 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1407 char *uuid = sb->device_uuid;
1409 memset(&cmsg, 0, sizeof(cmsg));
1410 cmsg.type = cpu_to_le32(NEWDISK);
1411 memcpy(cmsg.uuid, uuid, 16);
1412 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1413 lock_comm(cinfo, 1);
1414 ret = __sendmsg(cinfo, &cmsg);
1419 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
1420 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
1421 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
1422 /* Some node does not "see" the device */
1428 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
1429 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
1430 * will run soon after add_new_disk, the below path will be
1432 * md_wakeup_thread(mddev->thread)
1433 * -> conf->thread (raid1d)
1434 * -> md_check_recovery -> md_update_sb
1435 * -> metadata_update_start/finish
1436 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
1438 * For other failure cases, metadata_update_cancel and
1439 * add_new_disk_cancel also clear below bit as well.
1441 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1442 wake_up(&cinfo->wait);
1447 static void add_new_disk_cancel(struct mddev *mddev)
1449 struct md_cluster_info *cinfo = mddev->cluster_info;
1450 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1454 static int new_disk_ack(struct mddev *mddev, bool ack)
1456 struct md_cluster_info *cinfo = mddev->cluster_info;
1458 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
1459 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
1464 dlm_unlock_sync(cinfo->no_new_dev_lockres);
1465 complete(&cinfo->newdisk_completion);
1469 static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
1471 struct cluster_msg cmsg = {0};
1472 struct md_cluster_info *cinfo = mddev->cluster_info;
1473 cmsg.type = cpu_to_le32(REMOVE);
1474 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1475 return sendmsg(cinfo, &cmsg, 1);
1478 static int lock_all_bitmaps(struct mddev *mddev)
1480 int slot, my_slot, ret, held = 1, i = 0;
1482 struct md_cluster_info *cinfo = mddev->cluster_info;
1484 cinfo->other_bitmap_lockres =
1485 kcalloc(mddev->bitmap_info.nodes - 1,
1486 sizeof(struct dlm_lock_resource *), GFP_KERNEL);
1487 if (!cinfo->other_bitmap_lockres) {
1488 pr_err("md: can't alloc mem for other bitmap locks\n");
1492 my_slot = slot_number(mddev);
1493 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
1494 if (slot == my_slot)
1497 memset(str, '\0', 64);
1498 snprintf(str, 64, "bitmap%04d", slot);
1499 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
1500 if (!cinfo->other_bitmap_lockres[i])
1503 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
1504 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
1513 static void unlock_all_bitmaps(struct mddev *mddev)
1515 struct md_cluster_info *cinfo = mddev->cluster_info;
1518 /* release other node's bitmap lock if they are existed */
1519 if (cinfo->other_bitmap_lockres) {
1520 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
1521 if (cinfo->other_bitmap_lockres[i]) {
1522 lockres_free(cinfo->other_bitmap_lockres[i]);
1525 kfree(cinfo->other_bitmap_lockres);
1529 static int gather_bitmaps(struct md_rdev *rdev)
1533 struct cluster_msg cmsg = {0};
1534 struct mddev *mddev = rdev->mddev;
1535 struct md_cluster_info *cinfo = mddev->cluster_info;
1537 cmsg.type = cpu_to_le32(RE_ADD);
1538 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1539 err = sendmsg(cinfo, &cmsg, 1);
1543 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1544 if (sn == (cinfo->slot_number - 1))
1546 err = md_bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
1548 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1551 if ((hi > 0) && (lo < mddev->recovery_cp))
1552 mddev->recovery_cp = lo;
1558 static struct md_cluster_operations cluster_ops = {
1561 .slot_number = slot_number,
1562 .resync_start = resync_start,
1563 .resync_finish = resync_finish,
1564 .resync_info_update = resync_info_update,
1565 .resync_info_get = resync_info_get,
1566 .metadata_update_start = metadata_update_start,
1567 .metadata_update_finish = metadata_update_finish,
1568 .metadata_update_cancel = metadata_update_cancel,
1569 .area_resyncing = area_resyncing,
1570 .add_new_disk = add_new_disk,
1571 .add_new_disk_cancel = add_new_disk_cancel,
1572 .new_disk_ack = new_disk_ack,
1573 .remove_disk = remove_disk,
1574 .load_bitmaps = load_bitmaps,
1575 .gather_bitmaps = gather_bitmaps,
1576 .resize_bitmaps = resize_bitmaps,
1577 .lock_all_bitmaps = lock_all_bitmaps,
1578 .unlock_all_bitmaps = unlock_all_bitmaps,
1579 .update_size = update_size,
1582 static int __init cluster_init(void)
1584 pr_warn("md-cluster: support raid1 and raid10 (limited support)\n");
1585 pr_info("Registering Cluster MD functions\n");
1586 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
1590 static void cluster_exit(void)
1592 unregister_md_cluster_operations();
1595 module_init(cluster_init);
1596 module_exit(cluster_exit);
1597 MODULE_AUTHOR("SUSE");
1598 MODULE_LICENSE("GPL");
1599 MODULE_DESCRIPTION("Clustering support for MD");