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");