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. */
38 struct list_head list;
46 /* md_cluster_info flags */
47 #define MD_CLUSTER_WAITING_FOR_NEWDISK 1
48 #define MD_CLUSTER_SUSPEND_READ_BALANCING 2
49 #define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
52 struct md_cluster_info {
53 /* dlm lock space and resources for clustered raid. */
54 dlm_lockspace_t *lockspace;
56 struct completion completion;
57 struct dlm_lock_resource *bitmap_lockres;
58 struct dlm_lock_resource *resync_lockres;
59 struct list_head suspend_list;
60 spinlock_t suspend_lock;
61 struct md_thread *recovery_thread;
62 unsigned long recovery_map;
63 /* communication loc resources */
64 struct dlm_lock_resource *ack_lockres;
65 struct dlm_lock_resource *message_lockres;
66 struct dlm_lock_resource *token_lockres;
67 struct dlm_lock_resource *no_new_dev_lockres;
68 struct md_thread *recv_thread;
69 struct completion newdisk_completion;
85 /* TODO: Unionize this for smaller footprint */
92 static void sync_ast(void *arg)
94 struct dlm_lock_resource *res;
97 complete(&res->completion);
100 static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
104 ret = dlm_lock(res->ls, mode, &res->lksb,
105 res->flags, res->name, strlen(res->name),
106 0, sync_ast, res, res->bast);
109 wait_for_completion(&res->completion);
110 if (res->lksb.sb_status == 0)
112 return res->lksb.sb_status;
115 static int dlm_unlock_sync(struct dlm_lock_resource *res)
117 return dlm_lock_sync(res, DLM_LOCK_NL);
120 static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
121 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
123 struct dlm_lock_resource *res = NULL;
125 struct md_cluster_info *cinfo = mddev->cluster_info;
127 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
130 init_completion(&res->completion);
131 res->ls = cinfo->lockspace;
133 res->mode = DLM_LOCK_IV;
134 namelen = strlen(name);
135 res->name = kzalloc(namelen + 1, GFP_KERNEL);
137 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
140 strlcpy(res->name, name, namelen + 1);
142 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
143 if (!res->lksb.sb_lvbptr) {
144 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
147 res->flags = DLM_LKF_VALBLK;
153 res->flags |= DLM_LKF_EXPEDITE;
155 ret = dlm_lock_sync(res, DLM_LOCK_NL);
157 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
160 res->flags &= ~DLM_LKF_EXPEDITE;
161 res->flags |= DLM_LKF_CONVERT;
165 kfree(res->lksb.sb_lvbptr);
171 static void lockres_free(struct dlm_lock_resource *res)
178 /* cancel a lock request or a conversion request that is blocked */
179 res->flags |= DLM_LKF_CANCEL;
181 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, 0, &res->lksb, res);
182 if (unlikely(ret != 0)) {
183 pr_info("%s: failed to unlock %s return %d\n", __func__, res->name, ret);
185 /* if a lock conversion is cancelled, then the lock is put
186 * back to grant queue, need to ensure it is unlocked */
187 if (ret == -DLM_ECANCEL)
190 res->flags &= ~DLM_LKF_CANCEL;
191 wait_for_completion(&res->completion);
194 kfree(res->lksb.sb_lvbptr);
198 static void add_resync_info(struct dlm_lock_resource *lockres,
199 sector_t lo, sector_t hi)
201 struct resync_info *ri;
203 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
204 ri->lo = cpu_to_le64(lo);
205 ri->hi = cpu_to_le64(hi);
208 static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
210 struct resync_info ri;
211 struct suspend_info *s = NULL;
214 dlm_lock_sync(lockres, DLM_LOCK_CR);
215 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
216 hi = le64_to_cpu(ri.hi);
218 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
222 s->lo = le64_to_cpu(ri.lo);
224 dlm_unlock_sync(lockres);
229 static void recover_bitmaps(struct md_thread *thread)
231 struct mddev *mddev = thread->mddev;
232 struct md_cluster_info *cinfo = mddev->cluster_info;
233 struct dlm_lock_resource *bm_lockres;
236 struct suspend_info *s, *tmp;
239 while (cinfo->recovery_map) {
240 slot = fls64((u64)cinfo->recovery_map) - 1;
242 /* Clear suspend_area associated with the bitmap */
243 spin_lock_irq(&cinfo->suspend_lock);
244 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
245 if (slot == s->slot) {
249 spin_unlock_irq(&cinfo->suspend_lock);
251 snprintf(str, 64, "bitmap%04d", slot);
252 bm_lockres = lockres_init(mddev, str, NULL, 1);
254 pr_err("md-cluster: Cannot initialize bitmaps\n");
258 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
260 pr_err("md-cluster: Could not DLM lock %s: %d\n",
264 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
266 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
270 /* TODO:Wait for current resync to get over */
271 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
272 if (lo < mddev->recovery_cp)
273 mddev->recovery_cp = lo;
274 md_check_recovery(mddev);
277 dlm_unlock_sync(bm_lockres);
279 clear_bit(slot, &cinfo->recovery_map);
283 static void recover_prep(void *arg)
285 struct mddev *mddev = arg;
286 struct md_cluster_info *cinfo = mddev->cluster_info;
287 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
290 static void __recover_slot(struct mddev *mddev, int slot)
292 struct md_cluster_info *cinfo = mddev->cluster_info;
294 set_bit(slot, &cinfo->recovery_map);
295 if (!cinfo->recovery_thread) {
296 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
298 if (!cinfo->recovery_thread) {
299 pr_warn("md-cluster: Could not create recovery thread\n");
303 md_wakeup_thread(cinfo->recovery_thread);
306 static void recover_slot(void *arg, struct dlm_slot *slot)
308 struct mddev *mddev = arg;
309 struct md_cluster_info *cinfo = mddev->cluster_info;
311 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
312 mddev->bitmap_info.cluster_name,
313 slot->nodeid, slot->slot,
315 /* deduct one since dlm slot starts from one while the num of
316 * cluster-md begins with 0 */
317 __recover_slot(mddev, slot->slot - 1);
320 static void recover_done(void *arg, struct dlm_slot *slots,
321 int num_slots, int our_slot,
324 struct mddev *mddev = arg;
325 struct md_cluster_info *cinfo = mddev->cluster_info;
327 cinfo->slot_number = our_slot;
328 /* completion is only need to be complete when node join cluster,
329 * it doesn't need to run during another node's failure */
330 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
331 complete(&cinfo->completion);
332 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
334 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
337 /* the ops is called when node join the cluster, and do lock recovery
338 * if node failure occurs */
339 static const struct dlm_lockspace_ops md_ls_ops = {
340 .recover_prep = recover_prep,
341 .recover_slot = recover_slot,
342 .recover_done = recover_done,
346 * The BAST function for the ack lock resource
347 * This function wakes up the receive thread in
348 * order to receive and process the message.
350 static void ack_bast(void *arg, int mode)
352 struct dlm_lock_resource *res = arg;
353 struct md_cluster_info *cinfo = res->mddev->cluster_info;
355 if (mode == DLM_LOCK_EX)
356 md_wakeup_thread(cinfo->recv_thread);
359 static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
361 struct suspend_info *s, *tmp;
363 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
364 if (slot == s->slot) {
371 static void remove_suspend_info(struct mddev *mddev, int slot)
373 struct md_cluster_info *cinfo = mddev->cluster_info;
374 spin_lock_irq(&cinfo->suspend_lock);
375 __remove_suspend_info(cinfo, slot);
376 spin_unlock_irq(&cinfo->suspend_lock);
377 mddev->pers->quiesce(mddev, 2);
381 static void process_suspend_info(struct mddev *mddev,
382 int slot, sector_t lo, sector_t hi)
384 struct md_cluster_info *cinfo = mddev->cluster_info;
385 struct suspend_info *s;
388 remove_suspend_info(mddev, slot);
389 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
390 md_wakeup_thread(mddev->thread);
393 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
399 mddev->pers->quiesce(mddev, 1);
400 mddev->pers->quiesce(mddev, 0);
401 spin_lock_irq(&cinfo->suspend_lock);
402 /* Remove existing entry (if exists) before adding */
403 __remove_suspend_info(cinfo, slot);
404 list_add(&s->list, &cinfo->suspend_list);
405 spin_unlock_irq(&cinfo->suspend_lock);
406 mddev->pers->quiesce(mddev, 2);
409 static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
412 struct md_cluster_info *cinfo = mddev->cluster_info;
413 char event_name[] = "EVENT=ADD_DEVICE";
415 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
418 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
419 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
420 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
421 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
422 init_completion(&cinfo->newdisk_completion);
423 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
424 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
425 wait_for_completion_timeout(&cinfo->newdisk_completion,
427 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
431 static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
433 struct md_cluster_info *cinfo = mddev->cluster_info;
434 md_reload_sb(mddev, le32_to_cpu(msg->raid_slot));
435 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
438 static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
440 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
441 le32_to_cpu(msg->raid_slot));
444 md_kick_rdev_from_array(rdev);
446 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
447 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
450 static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
452 struct md_rdev *rdev = md_find_rdev_nr_rcu(mddev,
453 le32_to_cpu(msg->raid_slot));
455 if (rdev && test_bit(Faulty, &rdev->flags))
456 clear_bit(Faulty, &rdev->flags);
458 pr_warn("%s: %d Could not find disk(%d) which is faulty",
459 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
462 static void process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
464 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
465 "node %d received it's own msg\n", le32_to_cpu(msg->slot)))
467 switch (le32_to_cpu(msg->type)) {
468 case METADATA_UPDATED:
469 process_metadata_update(mddev, msg);
472 process_suspend_info(mddev, le32_to_cpu(msg->slot),
473 le64_to_cpu(msg->low),
474 le64_to_cpu(msg->high));
477 process_add_new_disk(mddev, msg);
480 process_remove_disk(mddev, msg);
483 process_readd_disk(mddev, msg);
485 case BITMAP_NEEDS_SYNC:
486 __recover_slot(mddev, le32_to_cpu(msg->slot));
489 pr_warn("%s:%d Received unknown message from %d\n",
490 __func__, __LINE__, msg->slot);
495 * thread for receiving message
497 static void recv_daemon(struct md_thread *thread)
499 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
500 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
501 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
502 struct cluster_msg msg;
505 /*get CR on Message*/
506 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
507 pr_err("md/raid1:failed to get CR on MESSAGE\n");
511 /* read lvb and wake up thread to process this message_lockres */
512 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
513 process_recvd_msg(thread->mddev, &msg);
515 /*release CR on ack_lockres*/
516 ret = dlm_unlock_sync(ack_lockres);
517 if (unlikely(ret != 0))
518 pr_info("unlock ack failed return %d\n", ret);
519 /*up-convert to PR on message_lockres*/
520 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
521 if (unlikely(ret != 0))
522 pr_info("lock PR on msg failed return %d\n", ret);
523 /*get CR on ack_lockres again*/
524 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
525 if (unlikely(ret != 0))
526 pr_info("lock CR on ack failed return %d\n", ret);
527 /*release CR on message_lockres*/
528 ret = dlm_unlock_sync(message_lockres);
529 if (unlikely(ret != 0))
530 pr_info("unlock msg failed return %d\n", ret);
534 * Takes the lock on the TOKEN lock resource so no other
535 * node can communicate while the operation is underway.
536 * If called again, and the TOKEN lock is alread in EX mode
537 * return success. However, care must be taken that unlock_comm()
538 * is called only once.
540 static int lock_comm(struct md_cluster_info *cinfo)
544 if (cinfo->token_lockres->mode == DLM_LOCK_EX)
547 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
549 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
550 __func__, __LINE__, error);
554 static void unlock_comm(struct md_cluster_info *cinfo)
556 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
557 dlm_unlock_sync(cinfo->token_lockres);
561 * This function performs the actual sending of the message. This function is
562 * usually called after performing the encompassing operation
564 * 1. Grabs the message lockresource in EX mode
565 * 2. Copies the message to the message LVB
566 * 3. Downconverts message lockresource to CW
567 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
568 * and the other nodes read the message. The thread will wait here until all other
569 * nodes have released ack lock resource.
570 * 5. Downconvert ack lockresource to CR
572 static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
575 int slot = cinfo->slot_number - 1;
577 cmsg->slot = cpu_to_le32(slot);
578 /*get EX on Message*/
579 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
581 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
585 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
586 sizeof(struct cluster_msg));
587 /*down-convert EX to CW on Message*/
588 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
590 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
595 /*up-convert CR to EX on Ack*/
596 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
598 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
603 /*down-convert EX to CR on Ack*/
604 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
606 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
612 error = dlm_unlock_sync(cinfo->message_lockres);
613 if (unlikely(error != 0)) {
614 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
616 /* in case the message can't be released due to some reason */
623 static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
628 ret = __sendmsg(cinfo, cmsg);
633 static int gather_all_resync_info(struct mddev *mddev, int total_slots)
635 struct md_cluster_info *cinfo = mddev->cluster_info;
637 struct dlm_lock_resource *bm_lockres;
638 struct suspend_info *s;
643 for (i = 0; i < total_slots; i++) {
644 memset(str, '\0', 64);
645 snprintf(str, 64, "bitmap%04d", i);
646 bm_lockres = lockres_init(mddev, str, NULL, 1);
649 if (i == (cinfo->slot_number - 1))
652 bm_lockres->flags |= DLM_LKF_NOQUEUE;
653 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
654 if (ret == -EAGAIN) {
655 memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);
656 s = read_resync_info(mddev, bm_lockres);
658 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
660 (unsigned long long) s->lo,
661 (unsigned long long) s->hi, i);
662 spin_lock_irq(&cinfo->suspend_lock);
664 list_add(&s->list, &cinfo->suspend_list);
665 spin_unlock_irq(&cinfo->suspend_lock);
668 lockres_free(bm_lockres);
672 lockres_free(bm_lockres);
676 /* Read the disk bitmap sb and check if it needs recovery */
677 ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
679 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
680 lockres_free(bm_lockres);
683 if ((hi > 0) && (lo < mddev->recovery_cp)) {
684 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
685 mddev->recovery_cp = lo;
686 md_check_recovery(mddev);
689 dlm_unlock_sync(bm_lockres);
690 lockres_free(bm_lockres);
696 static int join(struct mddev *mddev, int nodes)
698 struct md_cluster_info *cinfo;
702 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
706 INIT_LIST_HEAD(&cinfo->suspend_list);
707 spin_lock_init(&cinfo->suspend_lock);
708 init_completion(&cinfo->completion);
709 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
711 mddev->cluster_info = cinfo;
714 sprintf(str, "%pU", mddev->uuid);
715 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
716 DLM_LSFL_FS, LVB_SIZE,
717 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
720 wait_for_completion(&cinfo->completion);
721 if (nodes < cinfo->slot_number) {
722 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
723 cinfo->slot_number, nodes);
727 /* Initiate the communication resources */
729 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
730 if (!cinfo->recv_thread) {
731 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
734 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
735 if (!cinfo->message_lockres)
737 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
738 if (!cinfo->token_lockres)
740 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
741 if (!cinfo->ack_lockres)
743 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
744 if (!cinfo->no_new_dev_lockres)
747 /* get sync CR lock on ACK. */
748 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
749 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
751 /* get sync CR lock on no-new-dev. */
752 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
753 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
756 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
757 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
758 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
759 if (!cinfo->bitmap_lockres)
761 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
762 pr_err("Failed to get bitmap lock\n");
767 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
768 if (!cinfo->resync_lockres)
771 ret = gather_all_resync_info(mddev, nodes);
777 lockres_free(cinfo->message_lockres);
778 lockres_free(cinfo->token_lockres);
779 lockres_free(cinfo->ack_lockres);
780 lockres_free(cinfo->no_new_dev_lockres);
781 lockres_free(cinfo->resync_lockres);
782 lockres_free(cinfo->bitmap_lockres);
783 if (cinfo->lockspace)
784 dlm_release_lockspace(cinfo->lockspace, 2);
785 mddev->cluster_info = NULL;
790 static void resync_bitmap(struct mddev *mddev)
792 struct md_cluster_info *cinfo = mddev->cluster_info;
793 struct cluster_msg cmsg = {0};
796 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
797 err = sendmsg(cinfo, &cmsg);
799 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
800 __func__, __LINE__, err);
803 static int leave(struct mddev *mddev)
805 struct md_cluster_info *cinfo = mddev->cluster_info;
810 /* BITMAP_NEEDS_SYNC message should be sent when node
811 * is leaving the cluster with dirty bitmap, also we
812 * can only deliver it when dlm connection is available */
813 if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector)
814 resync_bitmap(mddev);
816 md_unregister_thread(&cinfo->recovery_thread);
817 md_unregister_thread(&cinfo->recv_thread);
818 lockres_free(cinfo->message_lockres);
819 lockres_free(cinfo->token_lockres);
820 lockres_free(cinfo->ack_lockres);
821 lockres_free(cinfo->no_new_dev_lockres);
822 lockres_free(cinfo->bitmap_lockres);
823 dlm_release_lockspace(cinfo->lockspace, 2);
827 /* slot_number(): Returns the MD slot number to use
828 * DLM starts the slot numbers from 1, wheras cluster-md
829 * wants the number to be from zero, so we deduct one
831 static int slot_number(struct mddev *mddev)
833 struct md_cluster_info *cinfo = mddev->cluster_info;
835 return cinfo->slot_number - 1;
838 static int metadata_update_start(struct mddev *mddev)
840 return lock_comm(mddev->cluster_info);
843 static int metadata_update_finish(struct mddev *mddev)
845 struct md_cluster_info *cinfo = mddev->cluster_info;
846 struct cluster_msg cmsg;
847 struct md_rdev *rdev;
851 memset(&cmsg, 0, sizeof(cmsg));
852 cmsg.type = cpu_to_le32(METADATA_UPDATED);
853 /* Pick up a good active device number to send.
855 rdev_for_each(rdev, mddev)
856 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
857 raid_slot = rdev->desc_nr;
860 if (raid_slot >= 0) {
861 cmsg.raid_slot = cpu_to_le32(raid_slot);
862 ret = __sendmsg(cinfo, &cmsg);
864 pr_warn("md-cluster: No good device id found to send\n");
869 static void metadata_update_cancel(struct mddev *mddev)
871 struct md_cluster_info *cinfo = mddev->cluster_info;
875 static int resync_start(struct mddev *mddev)
877 struct md_cluster_info *cinfo = mddev->cluster_info;
878 cinfo->resync_lockres->flags |= DLM_LKF_NOQUEUE;
879 return dlm_lock_sync(cinfo->resync_lockres, DLM_LOCK_EX);
882 static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
884 struct md_cluster_info *cinfo = mddev->cluster_info;
885 struct cluster_msg cmsg = {0};
887 add_resync_info(cinfo->bitmap_lockres, lo, hi);
888 /* Re-acquire the lock to refresh LVB */
889 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
890 cmsg.type = cpu_to_le32(RESYNCING);
891 cmsg.low = cpu_to_le64(lo);
892 cmsg.high = cpu_to_le64(hi);
894 return sendmsg(cinfo, &cmsg);
897 static int resync_finish(struct mddev *mddev)
899 struct md_cluster_info *cinfo = mddev->cluster_info;
900 cinfo->resync_lockres->flags &= ~DLM_LKF_NOQUEUE;
901 dlm_unlock_sync(cinfo->resync_lockres);
902 return resync_info_update(mddev, 0, 0);
905 static int area_resyncing(struct mddev *mddev, int direction,
906 sector_t lo, sector_t hi)
908 struct md_cluster_info *cinfo = mddev->cluster_info;
910 struct suspend_info *s;
912 if ((direction == READ) &&
913 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
916 spin_lock_irq(&cinfo->suspend_lock);
917 if (list_empty(&cinfo->suspend_list))
919 list_for_each_entry(s, &cinfo->suspend_list, list)
920 if (hi > s->lo && lo < s->hi) {
925 spin_unlock_irq(&cinfo->suspend_lock);
929 /* add_new_disk() - initiates a disk add
930 * However, if this fails before writing md_update_sb(),
931 * add_new_disk_cancel() must be called to release token lock
933 static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
935 struct md_cluster_info *cinfo = mddev->cluster_info;
936 struct cluster_msg cmsg;
938 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
939 char *uuid = sb->device_uuid;
941 memset(&cmsg, 0, sizeof(cmsg));
942 cmsg.type = cpu_to_le32(NEWDISK);
943 memcpy(cmsg.uuid, uuid, 16);
944 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
946 ret = __sendmsg(cinfo, &cmsg);
949 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
950 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
951 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
952 /* Some node does not "see" the device */
958 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
962 static void add_new_disk_cancel(struct mddev *mddev)
964 struct md_cluster_info *cinfo = mddev->cluster_info;
968 static int new_disk_ack(struct mddev *mddev, bool ack)
970 struct md_cluster_info *cinfo = mddev->cluster_info;
972 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
973 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
978 dlm_unlock_sync(cinfo->no_new_dev_lockres);
979 complete(&cinfo->newdisk_completion);
983 static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
985 struct cluster_msg cmsg = {0};
986 struct md_cluster_info *cinfo = mddev->cluster_info;
987 cmsg.type = cpu_to_le32(REMOVE);
988 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
989 return __sendmsg(cinfo, &cmsg);
992 static int gather_bitmaps(struct md_rdev *rdev)
996 struct cluster_msg cmsg = {0};
997 struct mddev *mddev = rdev->mddev;
998 struct md_cluster_info *cinfo = mddev->cluster_info;
1000 cmsg.type = cpu_to_le32(RE_ADD);
1001 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1002 err = sendmsg(cinfo, &cmsg);
1006 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1007 if (sn == (cinfo->slot_number - 1))
1009 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
1011 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1014 if ((hi > 0) && (lo < mddev->recovery_cp))
1015 mddev->recovery_cp = lo;
1021 static struct md_cluster_operations cluster_ops = {
1024 .slot_number = slot_number,
1025 .resync_start = resync_start,
1026 .resync_finish = resync_finish,
1027 .resync_info_update = resync_info_update,
1028 .metadata_update_start = metadata_update_start,
1029 .metadata_update_finish = metadata_update_finish,
1030 .metadata_update_cancel = metadata_update_cancel,
1031 .area_resyncing = area_resyncing,
1032 .add_new_disk = add_new_disk,
1033 .add_new_disk_cancel = add_new_disk_cancel,
1034 .new_disk_ack = new_disk_ack,
1035 .remove_disk = remove_disk,
1036 .gather_bitmaps = gather_bitmaps,
1039 static int __init cluster_init(void)
1041 pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
1042 pr_info("Registering Cluster MD functions\n");
1043 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
1047 static void cluster_exit(void)
1049 unregister_md_cluster_operations();
1052 module_init(cluster_init);
1053 module_exit(cluster_exit);
1054 MODULE_AUTHOR("SUSE");
1055 MODULE_LICENSE("GPL");
1056 MODULE_DESCRIPTION("Clustering support for MD");