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/dlm.h>
14 #include <linux/sched.h>
15 #include <linux/raid/md_p.h>
18 #include "md-cluster.h"
21 #define NEW_DEV_TIMEOUT 5000
23 struct dlm_lock_resource {
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. */
37 struct list_head list;
45 /* md_cluster_info flags */
46 #define MD_CLUSTER_WAITING_FOR_NEWDISK 1
47 #define MD_CLUSTER_SUSPEND_READ_BALANCING 2
48 #define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
51 struct md_cluster_info {
52 /* dlm lock space and resources for clustered raid. */
53 dlm_lockspace_t *lockspace;
55 struct completion completion;
56 struct mutex sb_mutex;
57 struct dlm_lock_resource *bitmap_lockres;
58 struct list_head suspend_list;
59 spinlock_t suspend_lock;
60 struct md_thread *recovery_thread;
61 unsigned long recovery_map;
62 /* communication loc resources */
63 struct dlm_lock_resource *ack_lockres;
64 struct dlm_lock_resource *message_lockres;
65 struct dlm_lock_resource *token_lockres;
66 struct dlm_lock_resource *no_new_dev_lockres;
67 struct md_thread *recv_thread;
68 struct completion newdisk_completion;
84 /* TODO: Unionize this for smaller footprint */
91 static void sync_ast(void *arg)
93 struct dlm_lock_resource *res;
95 res = (struct dlm_lock_resource *) arg;
96 complete(&res->completion);
99 static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
103 ret = dlm_lock(res->ls, mode, &res->lksb,
104 res->flags, res->name, strlen(res->name),
105 0, sync_ast, res, res->bast);
108 wait_for_completion(&res->completion);
109 return res->lksb.sb_status;
112 static int dlm_unlock_sync(struct dlm_lock_resource *res)
114 return dlm_lock_sync(res, DLM_LOCK_NL);
117 static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
118 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
120 struct dlm_lock_resource *res = NULL;
122 struct md_cluster_info *cinfo = mddev->cluster_info;
124 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
127 init_completion(&res->completion);
128 res->ls = cinfo->lockspace;
130 namelen = strlen(name);
131 res->name = kzalloc(namelen + 1, GFP_KERNEL);
133 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
136 strlcpy(res->name, name, namelen + 1);
138 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
139 if (!res->lksb.sb_lvbptr) {
140 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
143 res->flags = DLM_LKF_VALBLK;
149 res->flags |= DLM_LKF_EXPEDITE;
151 ret = dlm_lock_sync(res, DLM_LOCK_NL);
153 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
156 res->flags &= ~DLM_LKF_EXPEDITE;
157 res->flags |= DLM_LKF_CONVERT;
161 kfree(res->lksb.sb_lvbptr);
167 static void lockres_free(struct dlm_lock_resource *res)
174 /* cancel a lock request or a conversion request that is blocked */
175 res->flags |= DLM_LKF_CANCEL;
177 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
178 if (unlikely(ret != 0)) {
179 pr_info("%s: failed to unlock %s return %d\n", __func__, res->name, ret);
181 /* if a lock conversion is cancelled, then the lock is put
182 * back to grant queue, need to ensure it is unlocked */
183 if (ret == -DLM_ECANCEL)
186 res->flags &= ~DLM_LKF_CANCEL;
187 wait_for_completion(&res->completion);
190 kfree(res->lksb.sb_lvbptr);
194 static void add_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres,
195 sector_t lo, sector_t hi)
197 struct resync_info *ri;
199 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
200 ri->lo = cpu_to_le64(lo);
201 ri->hi = cpu_to_le64(hi);
204 static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
206 struct resync_info ri;
207 struct suspend_info *s = NULL;
210 dlm_lock_sync(lockres, DLM_LOCK_CR);
211 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
212 hi = le64_to_cpu(ri.hi);
214 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
218 s->lo = le64_to_cpu(ri.lo);
220 dlm_unlock_sync(lockres);
225 static void recover_bitmaps(struct md_thread *thread)
227 struct mddev *mddev = thread->mddev;
228 struct md_cluster_info *cinfo = mddev->cluster_info;
229 struct dlm_lock_resource *bm_lockres;
232 struct suspend_info *s, *tmp;
235 while (cinfo->recovery_map) {
236 slot = fls64((u64)cinfo->recovery_map) - 1;
238 /* Clear suspend_area associated with the bitmap */
239 spin_lock_irq(&cinfo->suspend_lock);
240 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
241 if (slot == s->slot) {
245 spin_unlock_irq(&cinfo->suspend_lock);
247 snprintf(str, 64, "bitmap%04d", slot);
248 bm_lockres = lockres_init(mddev, str, NULL, 1);
250 pr_err("md-cluster: Cannot initialize bitmaps\n");
254 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
256 pr_err("md-cluster: Could not DLM lock %s: %d\n",
260 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
262 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
266 /* TODO:Wait for current resync to get over */
267 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
268 if (lo < mddev->recovery_cp)
269 mddev->recovery_cp = lo;
270 md_check_recovery(mddev);
273 dlm_unlock_sync(bm_lockres);
275 clear_bit(slot, &cinfo->recovery_map);
279 static void recover_prep(void *arg)
281 struct mddev *mddev = arg;
282 struct md_cluster_info *cinfo = mddev->cluster_info;
283 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
286 static void __recover_slot(struct mddev *mddev, int slot)
288 struct md_cluster_info *cinfo = mddev->cluster_info;
290 set_bit(slot, &cinfo->recovery_map);
291 if (!cinfo->recovery_thread) {
292 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
294 if (!cinfo->recovery_thread) {
295 pr_warn("md-cluster: Could not create recovery thread\n");
299 md_wakeup_thread(cinfo->recovery_thread);
302 static void recover_slot(void *arg, struct dlm_slot *slot)
304 struct mddev *mddev = arg;
305 struct md_cluster_info *cinfo = mddev->cluster_info;
307 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
308 mddev->bitmap_info.cluster_name,
309 slot->nodeid, slot->slot,
311 /* deduct one since dlm slot starts from one while the num of
312 * cluster-md begins with 0 */
313 __recover_slot(mddev, slot->slot - 1);
316 static void recover_done(void *arg, struct dlm_slot *slots,
317 int num_slots, int our_slot,
320 struct mddev *mddev = arg;
321 struct md_cluster_info *cinfo = mddev->cluster_info;
323 cinfo->slot_number = our_slot;
324 /* completion is only need to be complete when node join cluster,
325 * it doesn't need to run during another node's failure */
326 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
327 complete(&cinfo->completion);
328 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
330 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
333 /* the ops is called when node join the cluster, and do lock recovery
334 * if node failure occurs */
335 static const struct dlm_lockspace_ops md_ls_ops = {
336 .recover_prep = recover_prep,
337 .recover_slot = recover_slot,
338 .recover_done = recover_done,
342 * The BAST function for the ack lock resource
343 * This function wakes up the receive thread in
344 * order to receive and process the message.
346 static void ack_bast(void *arg, int mode)
348 struct dlm_lock_resource *res = (struct dlm_lock_resource *)arg;
349 struct md_cluster_info *cinfo = res->mddev->cluster_info;
351 if (mode == DLM_LOCK_EX)
352 md_wakeup_thread(cinfo->recv_thread);
355 static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
357 struct suspend_info *s, *tmp;
359 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
360 if (slot == s->slot) {
361 pr_info("%s:%d Deleting suspend_info: %d\n",
362 __func__, __LINE__, slot);
369 static void remove_suspend_info(struct md_cluster_info *cinfo, int slot)
371 spin_lock_irq(&cinfo->suspend_lock);
372 __remove_suspend_info(cinfo, slot);
373 spin_unlock_irq(&cinfo->suspend_lock);
377 static void process_suspend_info(struct md_cluster_info *cinfo,
378 int slot, sector_t lo, sector_t hi)
380 struct suspend_info *s;
383 remove_suspend_info(cinfo, slot);
386 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
392 spin_lock_irq(&cinfo->suspend_lock);
393 /* Remove existing entry (if exists) before adding */
394 __remove_suspend_info(cinfo, slot);
395 list_add(&s->list, &cinfo->suspend_list);
396 spin_unlock_irq(&cinfo->suspend_lock);
399 static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
402 struct md_cluster_info *cinfo = mddev->cluster_info;
403 char event_name[] = "EVENT=ADD_DEVICE";
405 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
408 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
409 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
410 snprintf(raid_slot, 16, "RAID_DISK=%d", cmsg->raid_slot);
411 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
412 init_completion(&cinfo->newdisk_completion);
413 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
414 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
415 wait_for_completion_timeout(&cinfo->newdisk_completion,
417 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
421 static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
423 struct md_cluster_info *cinfo = mddev->cluster_info;
426 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
429 static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
431 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot);
434 md_kick_rdev_from_array(rdev);
436 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n", __func__, __LINE__, msg->raid_slot);
439 static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
441 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev, msg->raid_slot);
443 if (rdev && test_bit(Faulty, &rdev->flags))
444 clear_bit(Faulty, &rdev->flags);
446 pr_warn("%s: %d Could not find disk(%d) which is faulty", __func__, __LINE__, msg->raid_slot);
449 static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
452 case METADATA_UPDATED:
453 pr_info("%s: %d Received message: METADATA_UPDATE from %d\n",
454 __func__, __LINE__, msg->slot);
455 process_metadata_update(mddev, msg);
458 pr_info("%s: %d Received message: RESYNCING from %d\n",
459 __func__, __LINE__, msg->slot);
460 process_suspend_info(mddev->cluster_info, msg->slot,
461 msg->low, msg->high);
464 pr_info("%s: %d Received message: NEWDISK from %d\n",
465 __func__, __LINE__, msg->slot);
466 process_add_new_disk(mddev, msg);
469 pr_info("%s: %d Received REMOVE from %d\n",
470 __func__, __LINE__, msg->slot);
471 process_remove_disk(mddev, msg);
474 pr_info("%s: %d Received RE_ADD from %d\n",
475 __func__, __LINE__, msg->slot);
476 process_readd_disk(mddev, msg);
478 case BITMAP_NEEDS_SYNC:
479 pr_info("%s: %d Received BITMAP_NEEDS_SYNC from %d\n",
480 __func__, __LINE__, msg->slot);
481 __recover_slot(mddev, msg->slot);
484 pr_warn("%s:%d Received unknown message from %d\n",
485 __func__, __LINE__, msg->slot);
490 * thread for receiving message
492 static void recv_daemon(struct md_thread *thread)
494 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
495 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
496 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
497 struct cluster_msg msg;
500 /*get CR on Message*/
501 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
502 pr_err("md/raid1:failed to get CR on MESSAGE\n");
506 /* read lvb and wake up thread to process this message_lockres */
507 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
508 process_recvd_msg(thread->mddev, &msg);
510 /*release CR on ack_lockres*/
511 ret = dlm_unlock_sync(ack_lockres);
512 if (unlikely(ret != 0))
513 pr_info("unlock ack failed return %d\n", ret);
514 /*up-convert to PR on message_lockres*/
515 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
516 if (unlikely(ret != 0))
517 pr_info("lock PR on msg failed return %d\n", ret);
518 /*get CR on ack_lockres again*/
519 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
520 if (unlikely(ret != 0))
521 pr_info("lock CR on ack failed return %d\n", ret);
522 /*release CR on message_lockres*/
523 ret = dlm_unlock_sync(message_lockres);
524 if (unlikely(ret != 0))
525 pr_info("unlock msg failed return %d\n", ret);
529 * Takes the lock on the TOKEN lock resource so no other
530 * node can communicate while the operation is underway.
532 static int lock_comm(struct md_cluster_info *cinfo)
536 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
538 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
539 __func__, __LINE__, error);
543 static void unlock_comm(struct md_cluster_info *cinfo)
545 dlm_unlock_sync(cinfo->token_lockres);
549 * This function performs the actual sending of the message. This function is
550 * usually called after performing the encompassing operation
552 * 1. Grabs the message lockresource in EX mode
553 * 2. Copies the message to the message LVB
554 * 3. Downconverts message lockresource to CW
555 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
556 * and the other nodes read the message. The thread will wait here until all other
557 * nodes have released ack lock resource.
558 * 5. Downconvert ack lockresource to CR
560 static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
563 int slot = cinfo->slot_number - 1;
565 cmsg->slot = cpu_to_le32(slot);
566 /*get EX on Message*/
567 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
569 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
573 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
574 sizeof(struct cluster_msg));
575 /*down-convert EX to CW on Message*/
576 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
578 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
583 /*up-convert CR to EX on Ack*/
584 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
586 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
591 /*down-convert EX to CR on Ack*/
592 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
594 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
600 error = dlm_unlock_sync(cinfo->message_lockres);
601 if (unlikely(error != 0)) {
602 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
604 /* in case the message can't be released due to some reason */
611 static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
616 ret = __sendmsg(cinfo, cmsg);
621 static int gather_all_resync_info(struct mddev *mddev, int total_slots)
623 struct md_cluster_info *cinfo = mddev->cluster_info;
625 struct dlm_lock_resource *bm_lockres;
626 struct suspend_info *s;
631 for (i = 0; i < total_slots; i++) {
632 memset(str, '\0', 64);
633 snprintf(str, 64, "bitmap%04d", i);
634 bm_lockres = lockres_init(mddev, str, NULL, 1);
637 if (i == (cinfo->slot_number - 1))
640 bm_lockres->flags |= DLM_LKF_NOQUEUE;
641 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
642 if (ret == -EAGAIN) {
643 memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);
644 s = read_resync_info(mddev, bm_lockres);
646 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
648 (unsigned long long) s->lo,
649 (unsigned long long) s->hi, i);
650 spin_lock_irq(&cinfo->suspend_lock);
652 list_add(&s->list, &cinfo->suspend_list);
653 spin_unlock_irq(&cinfo->suspend_lock);
656 lockres_free(bm_lockres);
660 lockres_free(bm_lockres);
664 /* Read the disk bitmap sb and check if it needs recovery */
665 ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
667 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
668 lockres_free(bm_lockres);
671 if ((hi > 0) && (lo < mddev->recovery_cp)) {
672 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
673 mddev->recovery_cp = lo;
674 md_check_recovery(mddev);
677 dlm_unlock_sync(bm_lockres);
678 lockres_free(bm_lockres);
684 static int join(struct mddev *mddev, int nodes)
686 struct md_cluster_info *cinfo;
690 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
694 INIT_LIST_HEAD(&cinfo->suspend_list);
695 spin_lock_init(&cinfo->suspend_lock);
696 init_completion(&cinfo->completion);
697 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
699 mutex_init(&cinfo->sb_mutex);
700 mddev->cluster_info = cinfo;
703 sprintf(str, "%pU", mddev->uuid);
704 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
705 DLM_LSFL_FS, LVB_SIZE,
706 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
709 wait_for_completion(&cinfo->completion);
710 if (nodes < cinfo->slot_number) {
711 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
712 cinfo->slot_number, nodes);
716 /* Initiate the communication resources */
718 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
719 if (!cinfo->recv_thread) {
720 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
723 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
724 if (!cinfo->message_lockres)
726 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
727 if (!cinfo->token_lockres)
729 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
730 if (!cinfo->ack_lockres)
732 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
733 if (!cinfo->no_new_dev_lockres)
736 /* get sync CR lock on ACK. */
737 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
738 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
740 /* get sync CR lock on no-new-dev. */
741 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
742 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
745 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
746 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
747 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
748 if (!cinfo->bitmap_lockres)
750 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
751 pr_err("Failed to get bitmap lock\n");
756 ret = gather_all_resync_info(mddev, nodes);
762 lockres_free(cinfo->message_lockres);
763 lockres_free(cinfo->token_lockres);
764 lockres_free(cinfo->ack_lockres);
765 lockres_free(cinfo->no_new_dev_lockres);
766 lockres_free(cinfo->bitmap_lockres);
767 if (cinfo->lockspace)
768 dlm_release_lockspace(cinfo->lockspace, 2);
769 mddev->cluster_info = NULL;
774 static int leave(struct mddev *mddev)
776 struct md_cluster_info *cinfo = mddev->cluster_info;
780 md_unregister_thread(&cinfo->recovery_thread);
781 md_unregister_thread(&cinfo->recv_thread);
782 lockres_free(cinfo->message_lockres);
783 lockres_free(cinfo->token_lockres);
784 lockres_free(cinfo->ack_lockres);
785 lockres_free(cinfo->no_new_dev_lockres);
786 lockres_free(cinfo->bitmap_lockres);
787 dlm_release_lockspace(cinfo->lockspace, 2);
791 /* slot_number(): Returns the MD slot number to use
792 * DLM starts the slot numbers from 1, wheras cluster-md
793 * wants the number to be from zero, so we deduct one
795 static int slot_number(struct mddev *mddev)
797 struct md_cluster_info *cinfo = mddev->cluster_info;
799 return cinfo->slot_number - 1;
802 static void resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
804 struct md_cluster_info *cinfo = mddev->cluster_info;
806 add_resync_info(mddev, cinfo->bitmap_lockres, lo, hi);
807 /* Re-acquire the lock to refresh LVB */
808 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
811 static int metadata_update_start(struct mddev *mddev)
813 return lock_comm(mddev->cluster_info);
816 static int metadata_update_finish(struct mddev *mddev)
818 struct md_cluster_info *cinfo = mddev->cluster_info;
819 struct cluster_msg cmsg;
822 memset(&cmsg, 0, sizeof(cmsg));
823 cmsg.type = cpu_to_le32(METADATA_UPDATED);
824 ret = __sendmsg(cinfo, &cmsg);
829 static int metadata_update_cancel(struct mddev *mddev)
831 struct md_cluster_info *cinfo = mddev->cluster_info;
833 return dlm_unlock_sync(cinfo->token_lockres);
836 static int resync_send(struct mddev *mddev, enum msg_type type,
837 sector_t lo, sector_t hi)
839 struct md_cluster_info *cinfo = mddev->cluster_info;
840 struct cluster_msg cmsg;
841 int slot = cinfo->slot_number - 1;
843 pr_info("%s:%d lo: %llu hi: %llu\n", __func__, __LINE__,
844 (unsigned long long)lo,
845 (unsigned long long)hi);
846 resync_info_update(mddev, lo, hi);
847 cmsg.type = cpu_to_le32(type);
848 cmsg.slot = cpu_to_le32(slot);
849 cmsg.low = cpu_to_le64(lo);
850 cmsg.high = cpu_to_le64(hi);
851 return sendmsg(cinfo, &cmsg);
854 static int resync_start(struct mddev *mddev, sector_t lo, sector_t hi)
856 pr_info("%s:%d\n", __func__, __LINE__);
857 return resync_send(mddev, RESYNCING, lo, hi);
860 static void resync_finish(struct mddev *mddev)
862 struct md_cluster_info *cinfo = mddev->cluster_info;
863 struct cluster_msg cmsg;
864 int slot = cinfo->slot_number - 1;
866 pr_info("%s:%d\n", __func__, __LINE__);
867 resync_send(mddev, RESYNCING, 0, 0);
868 if (test_bit(MD_RECOVERY_INTR, &mddev->recovery)) {
869 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
870 cmsg.slot = cpu_to_le32(slot);
871 sendmsg(cinfo, &cmsg);
875 static int area_resyncing(struct mddev *mddev, int direction,
876 sector_t lo, sector_t hi)
878 struct md_cluster_info *cinfo = mddev->cluster_info;
880 struct suspend_info *s;
882 if ((direction == READ) &&
883 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
886 spin_lock_irq(&cinfo->suspend_lock);
887 if (list_empty(&cinfo->suspend_list))
889 list_for_each_entry(s, &cinfo->suspend_list, list)
890 if (hi > s->lo && lo < s->hi) {
895 spin_unlock_irq(&cinfo->suspend_lock);
899 static int add_new_disk_start(struct mddev *mddev, struct md_rdev *rdev)
901 struct md_cluster_info *cinfo = mddev->cluster_info;
902 struct cluster_msg cmsg;
904 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
905 char *uuid = sb->device_uuid;
907 memset(&cmsg, 0, sizeof(cmsg));
908 cmsg.type = cpu_to_le32(NEWDISK);
909 memcpy(cmsg.uuid, uuid, 16);
910 cmsg.raid_slot = rdev->desc_nr;
912 ret = __sendmsg(cinfo, &cmsg);
915 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
916 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
917 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
918 /* Some node does not "see" the device */
922 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
926 static int add_new_disk_finish(struct mddev *mddev)
928 struct cluster_msg cmsg;
929 struct md_cluster_info *cinfo = mddev->cluster_info;
931 /* Write sb and inform others */
932 md_update_sb(mddev, 1);
933 cmsg.type = METADATA_UPDATED;
934 ret = __sendmsg(cinfo, &cmsg);
939 static int new_disk_ack(struct mddev *mddev, bool ack)
941 struct md_cluster_info *cinfo = mddev->cluster_info;
943 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
944 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
949 dlm_unlock_sync(cinfo->no_new_dev_lockres);
950 complete(&cinfo->newdisk_completion);
954 static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
956 struct cluster_msg cmsg;
957 struct md_cluster_info *cinfo = mddev->cluster_info;
959 cmsg.raid_slot = rdev->desc_nr;
960 return __sendmsg(cinfo, &cmsg);
963 static int gather_bitmaps(struct md_rdev *rdev)
967 struct cluster_msg cmsg;
968 struct mddev *mddev = rdev->mddev;
969 struct md_cluster_info *cinfo = mddev->cluster_info;
972 cmsg.raid_slot = rdev->desc_nr;
973 err = sendmsg(cinfo, &cmsg);
977 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
978 if (sn == (cinfo->slot_number - 1))
980 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
982 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
985 if ((hi > 0) && (lo < mddev->recovery_cp))
986 mddev->recovery_cp = lo;
992 static struct md_cluster_operations cluster_ops = {
995 .slot_number = slot_number,
996 .resync_info_update = resync_info_update,
997 .resync_start = resync_start,
998 .resync_finish = resync_finish,
999 .metadata_update_start = metadata_update_start,
1000 .metadata_update_finish = metadata_update_finish,
1001 .metadata_update_cancel = metadata_update_cancel,
1002 .area_resyncing = area_resyncing,
1003 .add_new_disk_start = add_new_disk_start,
1004 .add_new_disk_finish = add_new_disk_finish,
1005 .new_disk_ack = new_disk_ack,
1006 .remove_disk = remove_disk,
1007 .gather_bitmaps = gather_bitmaps,
1010 static int __init cluster_init(void)
1012 pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
1013 pr_info("Registering Cluster MD functions\n");
1014 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
1018 static void cluster_exit(void)
1020 unregister_md_cluster_operations();
1023 module_init(cluster_init);
1024 module_exit(cluster_exit);
1025 MODULE_LICENSE("GPL");
1026 MODULE_DESCRIPTION("Clustering support for MD");