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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) 2015, SUSE
4 */
5
6
7#include <linux/module.h>
8#include <linux/kthread.h>
9#include <linux/dlm.h>
10#include <linux/sched.h>
11#include <linux/raid/md_p.h>
12#include "md.h"
13#include "md-bitmap.h"
14#include "md-cluster.h"
15
16#define LVB_SIZE 64
17#define NEW_DEV_TIMEOUT 5000
18#define WAIT_DLM_LOCK_TIMEOUT (30 * HZ)
19
20struct dlm_lock_resource {
21 dlm_lockspace_t *ls;
22 struct dlm_lksb lksb;
23 char *name; /* lock name. */
24 uint32_t flags; /* flags to pass to dlm_lock() */
25 wait_queue_head_t sync_locking; /* wait queue for synchronized locking */
26 bool sync_locking_done;
27 void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
28 struct mddev *mddev; /* pointing back to mddev. */
29 int mode;
30};
31
32struct resync_info {
33 __le64 lo;
34 __le64 hi;
35};
36
37/* md_cluster_info flags */
38#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
39#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
40#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
41
42/* Lock the send communication. This is done through
43 * bit manipulation as opposed to a mutex in order to
44 * accommodate lock and hold. See next comment.
45 */
46#define MD_CLUSTER_SEND_LOCK 4
47/* If cluster operations (such as adding a disk) must lock the
48 * communication channel, so as to perform extra operations
49 * (update metadata) and no other operation is allowed on the
50 * MD. Token needs to be locked and held until the operation
51 * completes witha md_update_sb(), which would eventually release
52 * the lock.
53 */
54#define MD_CLUSTER_SEND_LOCKED_ALREADY 5
55/* We should receive message after node joined cluster and
56 * set up all the related infos such as bitmap and personality */
57#define MD_CLUSTER_ALREADY_IN_CLUSTER 6
58#define MD_CLUSTER_PENDING_RECV_EVENT 7
59#define MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD 8
60#define MD_CLUSTER_WAITING_FOR_SYNC 9
61
62struct md_cluster_info {
63 struct mddev *mddev; /* the md device which md_cluster_info belongs to */
64 /* dlm lock space and resources for clustered raid. */
65 dlm_lockspace_t *lockspace;
66 int slot_number;
67 struct completion completion;
68 struct mutex recv_mutex;
69 struct dlm_lock_resource *bitmap_lockres;
70 struct dlm_lock_resource **other_bitmap_lockres;
71 struct dlm_lock_resource *resync_lockres;
72 struct list_head suspend_list;
73
74 spinlock_t suspend_lock;
75 /* record the region which write should be suspended */
76 sector_t suspend_lo;
77 sector_t suspend_hi;
78 int suspend_from; /* the slot which broadcast suspend_lo/hi */
79
80 struct md_thread __rcu *recovery_thread;
81 unsigned long recovery_map;
82 /* communication loc resources */
83 struct dlm_lock_resource *ack_lockres;
84 struct dlm_lock_resource *message_lockres;
85 struct dlm_lock_resource *token_lockres;
86 struct dlm_lock_resource *no_new_dev_lockres;
87 struct md_thread __rcu *recv_thread;
88 struct completion newdisk_completion;
89 wait_queue_head_t wait;
90 unsigned long state;
91 /* record the region in RESYNCING message */
92 sector_t sync_low;
93 sector_t sync_hi;
94};
95
96/* For compatibility, add the new msg_type at the end. */
97enum msg_type {
98 METADATA_UPDATED = 0,
99 RESYNCING,
100 NEWDISK,
101 REMOVE,
102 RE_ADD,
103 BITMAP_NEEDS_SYNC,
104 CHANGE_CAPACITY,
105 BITMAP_RESIZE,
106 RESYNCING_START,
107};
108
109struct cluster_msg {
110 __le32 type;
111 __le32 slot;
112 /* TODO: Unionize this for smaller footprint */
113 __le64 low;
114 __le64 high;
115 char uuid[16];
116 __le32 raid_slot;
117};
118
119static void sync_ast(void *arg)
120{
121 struct dlm_lock_resource *res;
122
123 res = arg;
124 res->sync_locking_done = true;
125 wake_up(&res->sync_locking);
126}
127
128static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
129{
130 int ret = 0;
131
132 ret = dlm_lock(res->ls, mode, &res->lksb,
133 res->flags, res->name, strlen(res->name),
134 0, sync_ast, res, res->bast);
135 if (ret)
136 return ret;
137 ret = wait_event_timeout(res->sync_locking, res->sync_locking_done,
138 WAIT_DLM_LOCK_TIMEOUT);
139 res->sync_locking_done = false;
140 if (!ret) {
141 pr_err("locking DLM '%s' timeout!\n", res->name);
142 return -EBUSY;
143 }
144 if (res->lksb.sb_status == 0)
145 res->mode = mode;
146 return res->lksb.sb_status;
147}
148
149static int dlm_unlock_sync(struct dlm_lock_resource *res)
150{
151 return dlm_lock_sync(res, DLM_LOCK_NL);
152}
153
154/*
155 * An variation of dlm_lock_sync, which make lock request could
156 * be interrupted
157 */
158static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode,
159 struct mddev *mddev)
160{
161 int ret = 0;
162
163 ret = dlm_lock(res->ls, mode, &res->lksb,
164 res->flags, res->name, strlen(res->name),
165 0, sync_ast, res, res->bast);
166 if (ret)
167 return ret;
168
169 wait_event(res->sync_locking, res->sync_locking_done
170 || kthread_should_stop()
171 || test_bit(MD_CLOSING, &mddev->flags));
172 if (!res->sync_locking_done) {
173 /*
174 * the convert queue contains the lock request when request is
175 * interrupted, and sync_ast could still be run, so need to
176 * cancel the request and reset completion
177 */
178 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL,
179 &res->lksb, res);
180 res->sync_locking_done = false;
181 if (unlikely(ret != 0))
182 pr_info("failed to cancel previous lock request "
183 "%s return %d\n", res->name, ret);
184 return -EPERM;
185 } else
186 res->sync_locking_done = false;
187 if (res->lksb.sb_status == 0)
188 res->mode = mode;
189 return res->lksb.sb_status;
190}
191
192static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
193 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
194{
195 struct dlm_lock_resource *res = NULL;
196 int ret, namelen;
197 struct md_cluster_info *cinfo = mddev->cluster_info;
198
199 res = kzalloc_obj(struct dlm_lock_resource);
200 if (!res)
201 return NULL;
202 init_waitqueue_head(&res->sync_locking);
203 res->sync_locking_done = false;
204 res->ls = cinfo->lockspace;
205 res->mddev = mddev;
206 res->mode = DLM_LOCK_IV;
207 namelen = strlen(name);
208 res->name = kzalloc(namelen + 1, GFP_KERNEL);
209 if (!res->name) {
210 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
211 goto out_err;
212 }
213 strscpy(res->name, name, namelen + 1);
214 if (with_lvb) {
215 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
216 if (!res->lksb.sb_lvbptr) {
217 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
218 goto out_err;
219 }
220 res->flags = DLM_LKF_VALBLK;
221 }
222
223 if (bastfn)
224 res->bast = bastfn;
225
226 res->flags |= DLM_LKF_EXPEDITE;
227
228 ret = dlm_lock_sync(res, DLM_LOCK_NL);
229 if (ret) {
230 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
231 goto out_err;
232 }
233 res->flags &= ~DLM_LKF_EXPEDITE;
234 res->flags |= DLM_LKF_CONVERT;
235
236 return res;
237out_err:
238 kfree(res->lksb.sb_lvbptr);
239 kfree(res->name);
240 kfree(res);
241 return NULL;
242}
243
244static void lockres_free(struct dlm_lock_resource *res)
245{
246 int ret = 0;
247
248 if (!res)
249 return;
250
251 /*
252 * use FORCEUNLOCK flag, so we can unlock even the lock is on the
253 * waiting or convert queue
254 */
255 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK,
256 &res->lksb, res);
257 if (unlikely(ret != 0))
258 pr_err("failed to unlock %s return %d\n", res->name, ret);
259 else
260 wait_event(res->sync_locking, res->sync_locking_done);
261
262 kfree(res->name);
263 kfree(res->lksb.sb_lvbptr);
264 kfree(res);
265}
266
267static void add_resync_info(struct dlm_lock_resource *lockres,
268 sector_t lo, sector_t hi)
269{
270 struct resync_info *ri;
271
272 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
273 ri->lo = cpu_to_le64(lo);
274 ri->hi = cpu_to_le64(hi);
275}
276
277static int read_resync_info(struct mddev *mddev,
278 struct dlm_lock_resource *lockres)
279{
280 struct resync_info ri;
281 struct md_cluster_info *cinfo = mddev->cluster_info;
282 int ret = 0;
283
284 dlm_lock_sync(lockres, DLM_LOCK_CR);
285 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
286 if (le64_to_cpu(ri.hi) > 0) {
287 cinfo->suspend_hi = le64_to_cpu(ri.hi);
288 cinfo->suspend_lo = le64_to_cpu(ri.lo);
289 ret = 1;
290 }
291 dlm_unlock_sync(lockres);
292 return ret;
293}
294
295static void recover_bitmaps(struct md_thread *thread)
296{
297 struct mddev *mddev = thread->mddev;
298 struct md_cluster_info *cinfo = mddev->cluster_info;
299 struct dlm_lock_resource *bm_lockres;
300 char str[64];
301 int slot, ret;
302 sector_t lo, hi;
303
304 while (cinfo->recovery_map) {
305 slot = fls64((u64)cinfo->recovery_map) - 1;
306
307 snprintf(str, 64, "bitmap%04d", slot);
308 bm_lockres = lockres_init(mddev, str, NULL, 1);
309 if (!bm_lockres) {
310 pr_err("md-cluster: Cannot initialize bitmaps\n");
311 goto clear_bit;
312 }
313
314 ret = dlm_lock_sync_interruptible(bm_lockres, DLM_LOCK_PW, mddev);
315 if (ret) {
316 pr_err("md-cluster: Could not DLM lock %s: %d\n",
317 str, ret);
318 goto clear_bit;
319 }
320 ret = mddev->bitmap_ops->copy_from_slot(mddev, slot, &lo, &hi, true);
321 if (ret) {
322 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
323 goto clear_bit;
324 }
325
326 /* Clear suspend_area associated with the bitmap */
327 spin_lock_irq(&cinfo->suspend_lock);
328 cinfo->suspend_hi = 0;
329 cinfo->suspend_lo = 0;
330 cinfo->suspend_from = -1;
331 spin_unlock_irq(&cinfo->suspend_lock);
332
333 /* Kick off a reshape if needed */
334 if (test_bit(MD_RESYNCING_REMOTE, &mddev->recovery) &&
335 test_bit(MD_RECOVERY_RESHAPE, &mddev->recovery) &&
336 mddev->reshape_position != MaxSector)
337 md_wakeup_thread(mddev->sync_thread);
338
339 if (hi > 0) {
340 if (lo < mddev->resync_offset)
341 mddev->resync_offset = lo;
342 /* wake up thread to continue resync in case resync
343 * is not finished */
344 if (mddev->resync_offset != MaxSector) {
345 /*
346 * clear the REMOTE flag since we will launch
347 * resync thread in current node.
348 */
349 clear_bit(MD_RESYNCING_REMOTE,
350 &mddev->recovery);
351 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
352 md_wakeup_thread(mddev->thread);
353 }
354 }
355clear_bit:
356 lockres_free(bm_lockres);
357 clear_bit(slot, &cinfo->recovery_map);
358 }
359}
360
361static void recover_prep(void *arg)
362{
363 struct mddev *mddev = arg;
364 struct md_cluster_info *cinfo = mddev->cluster_info;
365 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
366}
367
368static void __recover_slot(struct mddev *mddev, int slot)
369{
370 struct md_cluster_info *cinfo = mddev->cluster_info;
371
372 set_bit(slot, &cinfo->recovery_map);
373 if (!cinfo->recovery_thread) {
374 rcu_assign_pointer(cinfo->recovery_thread,
375 md_register_thread(recover_bitmaps, mddev, "recover"));
376 if (!cinfo->recovery_thread) {
377 pr_warn("md-cluster: Could not create recovery thread\n");
378 return;
379 }
380 }
381 md_wakeup_thread(cinfo->recovery_thread);
382}
383
384static void recover_slot(void *arg, struct dlm_slot *slot)
385{
386 struct mddev *mddev = arg;
387 struct md_cluster_info *cinfo = mddev->cluster_info;
388
389 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
390 mddev->bitmap_info.cluster_name,
391 slot->nodeid, slot->slot,
392 cinfo->slot_number);
393 /* deduct one since dlm slot starts from one while the num of
394 * cluster-md begins with 0 */
395 __recover_slot(mddev, slot->slot - 1);
396}
397
398static void recover_done(void *arg, struct dlm_slot *slots,
399 int num_slots, int our_slot,
400 uint32_t generation)
401{
402 struct mddev *mddev = arg;
403 struct md_cluster_info *cinfo = mddev->cluster_info;
404
405 cinfo->slot_number = our_slot;
406 /* completion is only need to be complete when node join cluster,
407 * it doesn't need to run during another node's failure */
408 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
409 complete(&cinfo->completion);
410 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
411 }
412 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
413}
414
415/* the ops is called when node join the cluster, and do lock recovery
416 * if node failure occurs */
417static const struct dlm_lockspace_ops md_ls_ops = {
418 .recover_prep = recover_prep,
419 .recover_slot = recover_slot,
420 .recover_done = recover_done,
421};
422
423/*
424 * The BAST function for the ack lock resource
425 * This function wakes up the receive thread in
426 * order to receive and process the message.
427 */
428static void ack_bast(void *arg, int mode)
429{
430 struct dlm_lock_resource *res = arg;
431 struct md_cluster_info *cinfo = res->mddev->cluster_info;
432
433 if (mode == DLM_LOCK_EX) {
434 if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state))
435 md_wakeup_thread(cinfo->recv_thread);
436 else
437 set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state);
438 }
439}
440
441static void remove_suspend_info(struct mddev *mddev, int slot)
442{
443 struct md_cluster_info *cinfo = mddev->cluster_info;
444 mddev->pers->quiesce(mddev, 1);
445 spin_lock_irq(&cinfo->suspend_lock);
446 cinfo->suspend_hi = 0;
447 cinfo->suspend_lo = 0;
448 spin_unlock_irq(&cinfo->suspend_lock);
449 mddev->pers->quiesce(mddev, 0);
450}
451
452static void process_suspend_info(struct mddev *mddev,
453 int slot, sector_t lo, sector_t hi)
454{
455 struct md_cluster_info *cinfo = mddev->cluster_info;
456 struct mdp_superblock_1 *sb = NULL;
457 struct md_rdev *rdev;
458
459 if (!hi) {
460 /*
461 * clear the REMOTE flag since resync or recovery is finished
462 * in remote node.
463 */
464 clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
465 remove_suspend_info(mddev, slot);
466 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
467 clear_bit(MD_CLUSTER_WAITING_FOR_SYNC, &cinfo->state);
468 md_wakeup_thread(mddev->thread);
469 return;
470 }
471
472 rdev_for_each(rdev, mddev)
473 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
474 sb = page_address(rdev->sb_page);
475 break;
476 }
477
478 /*
479 * The bitmaps are not same for different nodes
480 * if RESYNCING is happening in one node, then
481 * the node which received the RESYNCING message
482 * probably will perform resync with the region
483 * [lo, hi] again, so we could reduce resync time
484 * a lot if we can ensure that the bitmaps among
485 * different nodes are match up well.
486 *
487 * sync_low/hi is used to record the region which
488 * arrived in the previous RESYNCING message,
489 *
490 * Call md_bitmap_sync_with_cluster to clear NEEDED_MASK
491 * and set RESYNC_MASK since resync thread is running
492 * in another node, so we don't need to do the resync
493 * again with the same section.
494 *
495 * Skip md_bitmap_sync_with_cluster in case reshape
496 * happening, because reshaping region is small and
497 * we don't want to trigger lots of WARN.
498 */
499 if (sb && !(le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE))
500 mddev->bitmap_ops->sync_with_cluster(mddev, cinfo->sync_low,
501 cinfo->sync_hi, lo, hi);
502 cinfo->sync_low = lo;
503 cinfo->sync_hi = hi;
504
505 mddev->pers->quiesce(mddev, 1);
506 spin_lock_irq(&cinfo->suspend_lock);
507 cinfo->suspend_from = slot;
508 cinfo->suspend_lo = lo;
509 cinfo->suspend_hi = hi;
510 spin_unlock_irq(&cinfo->suspend_lock);
511 mddev->pers->quiesce(mddev, 0);
512}
513
514static int process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
515{
516 char disk_uuid[64];
517 struct md_cluster_info *cinfo = mddev->cluster_info;
518 char event_name[] = "EVENT=ADD_DEVICE";
519 char raid_slot[16];
520 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
521 int len;
522 int res = 0;
523
524 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
525 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
526 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
527 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
528 init_completion(&cinfo->newdisk_completion);
529 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
530 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
531 if (!wait_for_completion_timeout(&cinfo->newdisk_completion,
532 NEW_DEV_TIMEOUT)) {
533 pr_err("md-cluster(%s:%d): timeout on a new disk adding\n",
534 __func__, __LINE__);
535 res = -1;
536 }
537 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
538 set_bit(MD_CLUSTER_WAITING_FOR_SYNC, &cinfo->state);
539 return res;
540}
541
542
543static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
544{
545 int got_lock = 0;
546 struct md_thread *thread;
547 struct md_cluster_info *cinfo = mddev->cluster_info;
548 mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
549
550 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
551
552 thread = rcu_dereference_protected(mddev->thread, true);
553 if (!thread) {
554 pr_warn("md-cluster: Received metadata update but MD thread is not ready\n");
555 dlm_unlock_sync(cinfo->no_new_dev_lockres);
556 return;
557 }
558
559 wait_event(thread->wqueue,
560 (got_lock = mddev_trylock(mddev)) ||
561 test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state));
562 md_reload_sb(mddev, mddev->good_device_nr);
563 if (got_lock)
564 mddev_unlock(mddev);
565}
566
567static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
568{
569 struct md_rdev *rdev;
570
571 rcu_read_lock();
572 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
573 if (rdev) {
574 set_bit(ClusterRemove, &rdev->flags);
575 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
576 md_wakeup_thread(mddev->thread);
577 }
578 else
579 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
580 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
581 rcu_read_unlock();
582}
583
584static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
585{
586 struct md_rdev *rdev;
587
588 rcu_read_lock();
589 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
590 if (rdev && test_bit(Faulty, &rdev->flags))
591 clear_bit(Faulty, &rdev->flags);
592 else
593 pr_warn("%s: %d Could not find disk(%d) which is faulty",
594 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
595 rcu_read_unlock();
596}
597
598static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
599{
600 int ret = 0;
601
602 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
603 "node %d received its own msg\n", le32_to_cpu(msg->slot)))
604 return -1;
605 switch (le32_to_cpu(msg->type)) {
606 case METADATA_UPDATED:
607 process_metadata_update(mddev, msg);
608 break;
609 case CHANGE_CAPACITY:
610 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
611 break;
612 case RESYNCING_START:
613 clear_bit(MD_CLUSTER_WAITING_FOR_SYNC, &mddev->cluster_info->state);
614 break;
615 case RESYNCING:
616 set_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
617 process_suspend_info(mddev, le32_to_cpu(msg->slot),
618 le64_to_cpu(msg->low),
619 le64_to_cpu(msg->high));
620 break;
621 case NEWDISK:
622 if (process_add_new_disk(mddev, msg))
623 ret = -1;
624 break;
625 case REMOVE:
626 process_remove_disk(mddev, msg);
627 break;
628 case RE_ADD:
629 process_readd_disk(mddev, msg);
630 break;
631 case BITMAP_NEEDS_SYNC:
632 __recover_slot(mddev, le32_to_cpu(msg->slot));
633 break;
634 case BITMAP_RESIZE:
635 if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0))
636 ret = mddev->bitmap_ops->resize(mddev,
637 le64_to_cpu(msg->high),
638 0);
639 break;
640 default:
641 ret = -1;
642 pr_warn("%s:%d Received unknown message from %d\n",
643 __func__, __LINE__, msg->slot);
644 }
645 return ret;
646}
647
648/*
649 * thread for receiving message
650 */
651static void recv_daemon(struct md_thread *thread)
652{
653 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
654 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
655 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
656 struct cluster_msg msg;
657 int ret;
658
659 mutex_lock(&cinfo->recv_mutex);
660 /*get CR on Message*/
661 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
662 pr_err("md/raid1:failed to get CR on MESSAGE\n");
663 mutex_unlock(&cinfo->recv_mutex);
664 return;
665 }
666
667 /* read lvb and wake up thread to process this message_lockres */
668 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
669 ret = process_recvd_msg(thread->mddev, &msg);
670 if (ret)
671 goto out;
672
673 /*release CR on ack_lockres*/
674 ret = dlm_unlock_sync(ack_lockres);
675 if (unlikely(ret != 0))
676 pr_info("unlock ack failed return %d\n", ret);
677 /*up-convert to PR on message_lockres*/
678 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
679 if (unlikely(ret != 0))
680 pr_info("lock PR on msg failed return %d\n", ret);
681 /*get CR on ack_lockres again*/
682 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
683 if (unlikely(ret != 0))
684 pr_info("lock CR on ack failed return %d\n", ret);
685out:
686 /*release CR on message_lockres*/
687 ret = dlm_unlock_sync(message_lockres);
688 if (unlikely(ret != 0))
689 pr_info("unlock msg failed return %d\n", ret);
690 mutex_unlock(&cinfo->recv_mutex);
691}
692
693/* lock_token()
694 * Takes the lock on the TOKEN lock resource so no other
695 * node can communicate while the operation is underway.
696 */
697static int lock_token(struct md_cluster_info *cinfo)
698{
699 int error;
700
701 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
702 if (error) {
703 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
704 __func__, __LINE__, error);
705 } else {
706 /* Lock the receive sequence */
707 mutex_lock(&cinfo->recv_mutex);
708 }
709 return error;
710}
711
712/* lock_comm()
713 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
714 */
715static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked)
716{
717 int rv, set_bit = 0;
718 struct mddev *mddev = cinfo->mddev;
719
720 /*
721 * If resync thread run after raid1d thread, then process_metadata_update
722 * could not continue if raid1d held reconfig_mutex (and raid1d is blocked
723 * since another node already got EX on Token and waiting the EX of Ack),
724 * so let resync wake up thread in case flag is set.
725 */
726 if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
727 &cinfo->state)) {
728 rv = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
729 &cinfo->state);
730 WARN_ON_ONCE(rv);
731 md_wakeup_thread(mddev->thread);
732 set_bit = 1;
733 }
734
735 wait_event(cinfo->wait,
736 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
737 rv = lock_token(cinfo);
738 if (set_bit)
739 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
740 return rv;
741}
742
743static void unlock_comm(struct md_cluster_info *cinfo)
744{
745 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
746 mutex_unlock(&cinfo->recv_mutex);
747 dlm_unlock_sync(cinfo->token_lockres);
748 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
749 wake_up(&cinfo->wait);
750}
751
752/* __sendmsg()
753 * This function performs the actual sending of the message. This function is
754 * usually called after performing the encompassing operation
755 * The function:
756 * 1. Grabs the message lockresource in EX mode
757 * 2. Copies the message to the message LVB
758 * 3. Downconverts message lockresource to CW
759 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
760 * and the other nodes read the message. The thread will wait here until all other
761 * nodes have released ack lock resource.
762 * 5. Downconvert ack lockresource to CR
763 */
764static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
765{
766 int error, unlock_error;
767 int slot = cinfo->slot_number - 1;
768
769 cmsg->slot = cpu_to_le32(slot);
770 /*get EX on Message*/
771 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
772 if (error) {
773 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
774 return error;
775 }
776
777 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
778 sizeof(struct cluster_msg));
779 /*down-convert EX to CW on Message*/
780 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
781 if (error) {
782 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
783 error);
784 goto failed_ack;
785 }
786
787 /*up-convert CR to EX on Ack*/
788 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
789 if (error) {
790 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
791 error);
792 goto failed_ack;
793 }
794
795 /*down-convert EX to CR on Ack*/
796 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
797 if (error) {
798 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
799 error);
800 goto failed_ack;
801 }
802
803failed_ack:
804 while ((unlock_error = dlm_unlock_sync(cinfo->message_lockres)))
805 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
806 unlock_error);
807
808 return error;
809}
810
811static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg,
812 bool mddev_locked)
813{
814 int ret;
815
816 ret = lock_comm(cinfo, mddev_locked);
817 if (!ret) {
818 ret = __sendmsg(cinfo, cmsg);
819 unlock_comm(cinfo);
820 }
821 return ret;
822}
823
824static int gather_all_resync_info(struct mddev *mddev, int total_slots)
825{
826 struct md_cluster_info *cinfo = mddev->cluster_info;
827 int i, ret = 0;
828 struct dlm_lock_resource *bm_lockres;
829 char str[64];
830 sector_t lo, hi;
831
832
833 for (i = 0; i < total_slots; i++) {
834 memset(str, '\0', 64);
835 snprintf(str, 64, "bitmap%04d", i);
836 bm_lockres = lockres_init(mddev, str, NULL, 1);
837 if (!bm_lockres)
838 return -ENOMEM;
839 if (i == (cinfo->slot_number - 1)) {
840 lockres_free(bm_lockres);
841 continue;
842 }
843
844 bm_lockres->flags |= DLM_LKF_NOQUEUE;
845 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
846 if (ret == -EAGAIN) {
847 if (read_resync_info(mddev, bm_lockres)) {
848 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
849 __func__, __LINE__,
850 (unsigned long long) cinfo->suspend_lo,
851 (unsigned long long) cinfo->suspend_hi,
852 i);
853 cinfo->suspend_from = i;
854 }
855 ret = 0;
856 lockres_free(bm_lockres);
857 continue;
858 }
859 if (ret) {
860 lockres_free(bm_lockres);
861 goto out;
862 }
863
864 /* Read the disk bitmap sb and check if it needs recovery */
865 ret = mddev->bitmap_ops->copy_from_slot(mddev, i, &lo, &hi, false);
866 if (ret) {
867 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
868 lockres_free(bm_lockres);
869 continue;
870 }
871 if ((hi > 0) && (lo < mddev->resync_offset)) {
872 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
873 mddev->resync_offset = lo;
874 md_check_recovery(mddev);
875 }
876
877 lockres_free(bm_lockres);
878 }
879out:
880 return ret;
881}
882
883static int join(struct mddev *mddev, int nodes)
884{
885 struct md_cluster_info *cinfo;
886 int ret, ops_rv;
887 char str[64];
888
889 cinfo = kzalloc_obj(struct md_cluster_info);
890 if (!cinfo)
891 return -ENOMEM;
892
893 INIT_LIST_HEAD(&cinfo->suspend_list);
894 spin_lock_init(&cinfo->suspend_lock);
895 init_completion(&cinfo->completion);
896 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
897 init_waitqueue_head(&cinfo->wait);
898 mutex_init(&cinfo->recv_mutex);
899
900 mddev->cluster_info = cinfo;
901 cinfo->mddev = mddev;
902
903 memset(str, 0, 64);
904 sprintf(str, "%pU", mddev->uuid);
905 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
906 DLM_LSFL_SOFTIRQ, LVB_SIZE, &md_ls_ops, mddev,
907 &ops_rv, &cinfo->lockspace);
908 if (ret)
909 goto err;
910 wait_for_completion(&cinfo->completion);
911 if (nodes < cinfo->slot_number) {
912 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
913 cinfo->slot_number, nodes);
914 ret = -ERANGE;
915 goto err;
916 }
917 /* Initiate the communication resources */
918 ret = -ENOMEM;
919 rcu_assign_pointer(cinfo->recv_thread,
920 md_register_thread(recv_daemon, mddev, "cluster_recv"));
921 if (!cinfo->recv_thread) {
922 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
923 goto err;
924 }
925 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
926 if (!cinfo->message_lockres)
927 goto err;
928 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
929 if (!cinfo->token_lockres)
930 goto err;
931 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
932 if (!cinfo->no_new_dev_lockres)
933 goto err;
934
935 ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
936 if (ret) {
937 ret = -EAGAIN;
938 pr_err("md-cluster: can't join cluster to avoid lock issue\n");
939 goto err;
940 }
941 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
942 if (!cinfo->ack_lockres) {
943 ret = -ENOMEM;
944 goto err;
945 }
946 /* get sync CR lock on ACK. */
947 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
948 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
949 ret);
950 dlm_unlock_sync(cinfo->token_lockres);
951 /* get sync CR lock on no-new-dev. */
952 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
953 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
954
955
956 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
957 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
958 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
959 if (!cinfo->bitmap_lockres) {
960 ret = -ENOMEM;
961 goto err;
962 }
963 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
964 pr_err("Failed to get bitmap lock\n");
965 ret = -EINVAL;
966 goto err;
967 }
968
969 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
970 if (!cinfo->resync_lockres) {
971 ret = -ENOMEM;
972 goto err;
973 }
974
975 return 0;
976err:
977 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
978 md_unregister_thread(mddev, &cinfo->recovery_thread);
979 md_unregister_thread(mddev, &cinfo->recv_thread);
980 lockres_free(cinfo->message_lockres);
981 lockres_free(cinfo->token_lockres);
982 lockres_free(cinfo->ack_lockres);
983 lockres_free(cinfo->no_new_dev_lockres);
984 lockres_free(cinfo->resync_lockres);
985 lockres_free(cinfo->bitmap_lockres);
986 if (cinfo->lockspace)
987 dlm_release_lockspace(cinfo->lockspace, DLM_RELEASE_NORMAL);
988 mddev->cluster_info = NULL;
989 kfree(cinfo);
990 return ret;
991}
992
993static void load_bitmaps(struct mddev *mddev, int total_slots)
994{
995 struct md_cluster_info *cinfo = mddev->cluster_info;
996
997 /* load all the node's bitmap info for resync */
998 if (gather_all_resync_info(mddev, total_slots))
999 pr_err("md-cluster: failed to gather all resyn infos\n");
1000 set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state);
1001 /* wake up recv thread in case something need to be handled */
1002 if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state))
1003 md_wakeup_thread(cinfo->recv_thread);
1004}
1005
1006static void resync_bitmap(struct mddev *mddev)
1007{
1008 struct md_cluster_info *cinfo = mddev->cluster_info;
1009 struct cluster_msg cmsg = {0};
1010 int err;
1011
1012 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
1013 err = sendmsg(cinfo, &cmsg, 1);
1014 if (err)
1015 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
1016 __func__, __LINE__, err);
1017}
1018
1019static void unlock_all_bitmaps(struct mddev *mddev);
1020static int leave(struct mddev *mddev)
1021{
1022 struct md_cluster_info *cinfo = mddev->cluster_info;
1023
1024 if (!cinfo)
1025 return 0;
1026
1027 /*
1028 * BITMAP_NEEDS_SYNC message should be sent when node
1029 * is leaving the cluster with dirty bitmap, also we
1030 * can only deliver it when dlm connection is available.
1031 *
1032 * Also, we should send BITMAP_NEEDS_SYNC message in
1033 * case reshaping is interrupted.
1034 */
1035 if ((cinfo->slot_number > 0 && mddev->resync_offset != MaxSector) ||
1036 (mddev->reshape_position != MaxSector &&
1037 test_bit(MD_CLOSING, &mddev->flags)))
1038 resync_bitmap(mddev);
1039
1040 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1041 md_unregister_thread(mddev, &cinfo->recovery_thread);
1042 md_unregister_thread(mddev, &cinfo->recv_thread);
1043 lockres_free(cinfo->message_lockres);
1044 lockres_free(cinfo->token_lockres);
1045 lockres_free(cinfo->ack_lockres);
1046 lockres_free(cinfo->no_new_dev_lockres);
1047 lockres_free(cinfo->resync_lockres);
1048 lockres_free(cinfo->bitmap_lockres);
1049 unlock_all_bitmaps(mddev);
1050 dlm_release_lockspace(cinfo->lockspace, DLM_RELEASE_NORMAL);
1051 kfree(cinfo);
1052 return 0;
1053}
1054
1055/* slot_number(): Returns the MD slot number to use
1056 * DLM starts the slot numbers from 1, wheras cluster-md
1057 * wants the number to be from zero, so we deduct one
1058 */
1059static int slot_number(struct mddev *mddev)
1060{
1061 struct md_cluster_info *cinfo = mddev->cluster_info;
1062
1063 return cinfo->slot_number - 1;
1064}
1065
1066/*
1067 * Check if the communication is already locked, else lock the communication
1068 * channel.
1069 * If it is already locked, token is in EX mode, and hence lock_token()
1070 * should not be called.
1071 */
1072static int metadata_update_start(struct mddev *mddev)
1073{
1074 struct md_cluster_info *cinfo = mddev->cluster_info;
1075 int ret;
1076
1077 /*
1078 * metadata_update_start is always called with the protection of
1079 * reconfig_mutex, so set WAITING_FOR_TOKEN here.
1080 */
1081 ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
1082 &cinfo->state);
1083 WARN_ON_ONCE(ret);
1084 md_wakeup_thread(mddev->thread);
1085
1086 wait_event(cinfo->wait,
1087 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
1088 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
1089
1090 /* If token is already locked, return 0 */
1091 if (cinfo->token_lockres->mode == DLM_LOCK_EX) {
1092 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1093 return 0;
1094 }
1095
1096 ret = lock_token(cinfo);
1097 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1098 return ret;
1099}
1100
1101static int metadata_update_finish(struct mddev *mddev)
1102{
1103 struct md_cluster_info *cinfo = mddev->cluster_info;
1104 struct cluster_msg cmsg;
1105 struct md_rdev *rdev;
1106 int ret = 0;
1107 int raid_slot = -1;
1108
1109 memset(&cmsg, 0, sizeof(cmsg));
1110 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1111 /* Pick up a good active device number to send.
1112 */
1113 rdev_for_each(rdev, mddev)
1114 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
1115 raid_slot = rdev->desc_nr;
1116 break;
1117 }
1118 if (raid_slot >= 0) {
1119 cmsg.raid_slot = cpu_to_le32(raid_slot);
1120 ret = __sendmsg(cinfo, &cmsg);
1121 } else
1122 pr_warn("md-cluster: No good device id found to send\n");
1123 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1124 unlock_comm(cinfo);
1125 return ret;
1126}
1127
1128static void metadata_update_cancel(struct mddev *mddev)
1129{
1130 struct md_cluster_info *cinfo = mddev->cluster_info;
1131 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1132 unlock_comm(cinfo);
1133}
1134
1135static int update_bitmap_size(struct mddev *mddev, sector_t size)
1136{
1137 struct md_cluster_info *cinfo = mddev->cluster_info;
1138 struct cluster_msg cmsg = {0};
1139 int ret;
1140
1141 cmsg.type = cpu_to_le32(BITMAP_RESIZE);
1142 cmsg.high = cpu_to_le64(size);
1143 ret = sendmsg(cinfo, &cmsg, 0);
1144 if (ret)
1145 pr_err("%s:%d: failed to send BITMAP_RESIZE message (%d)\n",
1146 __func__, __LINE__, ret);
1147 return ret;
1148}
1149
1150static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize)
1151{
1152 void *bitmap = mddev->bitmap;
1153 struct md_bitmap_stats stats;
1154 unsigned long my_pages;
1155 int i, rv;
1156
1157 rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
1158 if (rv)
1159 return rv;
1160
1161 my_pages = stats.pages;
1162 /*
1163 * We need to ensure all the nodes can grow to a larger
1164 * bitmap size before make the reshaping.
1165 */
1166 rv = update_bitmap_size(mddev, newsize);
1167 if (rv)
1168 return rv;
1169
1170 for (i = 0; i < mddev->bitmap_info.nodes; i++) {
1171 struct dlm_lock_resource *bm_lockres;
1172 char str[64];
1173
1174 if (i == slot_number(mddev))
1175 continue;
1176
1177 bitmap = mddev->bitmap_ops->get_from_slot(mddev, i);
1178 if (IS_ERR(bitmap)) {
1179 pr_err("can't get bitmap from slot %d\n", i);
1180 bitmap = NULL;
1181 goto out;
1182 }
1183
1184 rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
1185 if (rv)
1186 goto out;
1187 /*
1188 * If we can hold the bitmap lock of one node then
1189 * the slot is not occupied, update the pages.
1190 */
1191 snprintf(str, 64, "bitmap%04d", i);
1192 bm_lockres = lockres_init(mddev, str, NULL, 1);
1193 if (!bm_lockres) {
1194 pr_err("Cannot initialize %s lock\n", str);
1195 goto out;
1196 }
1197 bm_lockres->flags |= DLM_LKF_NOQUEUE;
1198 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
1199 if (!rv)
1200 mddev->bitmap_ops->set_pages(bitmap, my_pages);
1201 lockres_free(bm_lockres);
1202
1203 if (my_pages != stats.pages)
1204 /*
1205 * Let's revert the bitmap size if one node
1206 * can't resize bitmap
1207 */
1208 goto out;
1209 mddev->bitmap_ops->free(bitmap);
1210 }
1211
1212 return 0;
1213out:
1214 mddev->bitmap_ops->free(bitmap);
1215 update_bitmap_size(mddev, oldsize);
1216 return -1;
1217}
1218
1219/*
1220 * return 0 if all the bitmaps have the same sync_size
1221 */
1222static int cluster_check_sync_size(struct mddev *mddev)
1223{
1224 int current_slot = slot_number(mddev);
1225 int node_num = mddev->bitmap_info.nodes;
1226 struct dlm_lock_resource *bm_lockres;
1227 struct md_bitmap_stats stats;
1228 void *bitmap = mddev->bitmap;
1229 unsigned long sync_size = 0;
1230 unsigned long my_sync_size;
1231 char str[64];
1232 int i, rv;
1233
1234 rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
1235 if (rv)
1236 return rv;
1237
1238 my_sync_size = stats.sync_size;
1239
1240 for (i = 0; i < node_num; i++) {
1241 if (i == current_slot)
1242 continue;
1243
1244 bitmap = mddev->bitmap_ops->get_from_slot(mddev, i);
1245 if (IS_ERR(bitmap)) {
1246 pr_err("can't get bitmap from slot %d\n", i);
1247 return -1;
1248 }
1249
1250 /*
1251 * If we can hold the bitmap lock of one node then
1252 * the slot is not occupied, update the sb.
1253 */
1254 snprintf(str, 64, "bitmap%04d", i);
1255 bm_lockres = lockres_init(mddev, str, NULL, 1);
1256 if (!bm_lockres) {
1257 pr_err("md-cluster: Cannot initialize %s\n", str);
1258 mddev->bitmap_ops->free(bitmap);
1259 return -1;
1260 }
1261 bm_lockres->flags |= DLM_LKF_NOQUEUE;
1262 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
1263 if (!rv)
1264 mddev->bitmap_ops->update_sb(bitmap);
1265 lockres_free(bm_lockres);
1266
1267 rv = mddev->bitmap_ops->get_stats(bitmap, &stats);
1268 if (rv) {
1269 mddev->bitmap_ops->free(bitmap);
1270 return rv;
1271 }
1272
1273 if (sync_size == 0) {
1274 sync_size = stats.sync_size;
1275 } else if (sync_size != stats.sync_size) {
1276 mddev->bitmap_ops->free(bitmap);
1277 return -1;
1278 }
1279 mddev->bitmap_ops->free(bitmap);
1280 }
1281
1282 return (my_sync_size == sync_size) ? 0 : -1;
1283}
1284
1285/*
1286 * Update the size for cluster raid is a little more complex, we perform it
1287 * by the steps:
1288 * 1. hold token lock and update superblock in initiator node.
1289 * 2. send METADATA_UPDATED msg to other nodes.
1290 * 3. The initiator node continues to check each bitmap's sync_size, if all
1291 * bitmaps have the same value of sync_size, then we can set capacity and
1292 * let other nodes to perform it. If one node can't update sync_size
1293 * accordingly, we need to revert to previous value.
1294 */
1295static void update_size(struct mddev *mddev, sector_t old_dev_sectors)
1296{
1297 struct md_cluster_info *cinfo = mddev->cluster_info;
1298 struct cluster_msg cmsg;
1299 struct md_rdev *rdev;
1300 int ret = 0;
1301 int raid_slot = -1;
1302
1303 md_update_sb(mddev, 1);
1304 if (lock_comm(cinfo, 1)) {
1305 pr_err("%s: lock_comm failed\n", __func__);
1306 return;
1307 }
1308
1309 memset(&cmsg, 0, sizeof(cmsg));
1310 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1311 rdev_for_each(rdev, mddev)
1312 if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) {
1313 raid_slot = rdev->desc_nr;
1314 break;
1315 }
1316 if (raid_slot >= 0) {
1317 cmsg.raid_slot = cpu_to_le32(raid_slot);
1318 /*
1319 * We can only change capiticy after all the nodes can do it,
1320 * so need to wait after other nodes already received the msg
1321 * and handled the change
1322 */
1323 ret = __sendmsg(cinfo, &cmsg);
1324 if (ret) {
1325 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1326 __func__, __LINE__);
1327 unlock_comm(cinfo);
1328 return;
1329 }
1330 } else {
1331 pr_err("md-cluster: No good device id found to send\n");
1332 unlock_comm(cinfo);
1333 return;
1334 }
1335
1336 /*
1337 * check the sync_size from other node's bitmap, if sync_size
1338 * have already updated in other nodes as expected, send an
1339 * empty metadata msg to permit the change of capacity
1340 */
1341 if (cluster_check_sync_size(mddev) == 0) {
1342 memset(&cmsg, 0, sizeof(cmsg));
1343 cmsg.type = cpu_to_le32(CHANGE_CAPACITY);
1344 ret = __sendmsg(cinfo, &cmsg);
1345 if (ret)
1346 pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n",
1347 __func__, __LINE__);
1348 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
1349 } else {
1350 /* revert to previous sectors */
1351 ret = mddev->pers->resize(mddev, old_dev_sectors);
1352 ret = __sendmsg(cinfo, &cmsg);
1353 if (ret)
1354 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1355 __func__, __LINE__);
1356 }
1357 unlock_comm(cinfo);
1358}
1359
1360static int resync_start(struct mddev *mddev)
1361{
1362 struct md_cluster_info *cinfo = mddev->cluster_info;
1363 return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev);
1364}
1365
1366static void resync_info_get(struct mddev *mddev, sector_t *lo, sector_t *hi)
1367{
1368 struct md_cluster_info *cinfo = mddev->cluster_info;
1369
1370 spin_lock_irq(&cinfo->suspend_lock);
1371 *lo = cinfo->suspend_lo;
1372 *hi = cinfo->suspend_hi;
1373 spin_unlock_irq(&cinfo->suspend_lock);
1374}
1375
1376static int resync_status_get(struct mddev *mddev)
1377{
1378 struct md_cluster_info *cinfo = mddev->cluster_info;
1379
1380 return test_bit(MD_CLUSTER_WAITING_FOR_SYNC, &cinfo->state);
1381}
1382
1383static int resync_start_notify(struct mddev *mddev)
1384{
1385 struct md_cluster_info *cinfo = mddev->cluster_info;
1386 struct cluster_msg cmsg = {0};
1387
1388 cmsg.type = cpu_to_le32(RESYNCING_START);
1389
1390 return sendmsg(cinfo, &cmsg, 0);
1391}
1392
1393static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
1394{
1395 struct md_cluster_info *cinfo = mddev->cluster_info;
1396 struct resync_info ri;
1397 struct cluster_msg cmsg = {0};
1398
1399 /* do not send zero again, if we have sent before */
1400 if (hi == 0) {
1401 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
1402 if (le64_to_cpu(ri.hi) == 0)
1403 return 0;
1404 }
1405
1406 add_resync_info(cinfo->bitmap_lockres, lo, hi);
1407 /* Re-acquire the lock to refresh LVB */
1408 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
1409 cmsg.type = cpu_to_le32(RESYNCING);
1410 cmsg.low = cpu_to_le64(lo);
1411 cmsg.high = cpu_to_le64(hi);
1412
1413 /*
1414 * mddev_lock is held if resync_info_update is called from
1415 * resync_finish (md_reap_sync_thread -> resync_finish)
1416 */
1417 if (lo == 0 && hi == 0)
1418 return sendmsg(cinfo, &cmsg, 1);
1419 else
1420 return sendmsg(cinfo, &cmsg, 0);
1421}
1422
1423static int resync_finish(struct mddev *mddev)
1424{
1425 struct md_cluster_info *cinfo = mddev->cluster_info;
1426 int ret = 0;
1427
1428 clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
1429
1430 /*
1431 * If resync thread is interrupted so we can't say resync is finished,
1432 * another node will launch resync thread to continue.
1433 */
1434 if (!test_bit(MD_CLOSING, &mddev->flags))
1435 ret = resync_info_update(mddev, 0, 0);
1436 dlm_unlock_sync(cinfo->resync_lockres);
1437 return ret;
1438}
1439
1440static int area_resyncing(struct mddev *mddev, int direction,
1441 sector_t lo, sector_t hi)
1442{
1443 struct md_cluster_info *cinfo = mddev->cluster_info;
1444 int ret = 0;
1445
1446 if ((direction == READ) &&
1447 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
1448 return 1;
1449
1450 spin_lock_irq(&cinfo->suspend_lock);
1451 if (hi > cinfo->suspend_lo && lo < cinfo->suspend_hi)
1452 ret = 1;
1453 spin_unlock_irq(&cinfo->suspend_lock);
1454 return ret;
1455}
1456
1457/* add_new_disk() - initiates a disk add
1458 * However, if this fails before writing md_update_sb(),
1459 * add_new_disk_cancel() must be called to release token lock
1460 */
1461static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
1462{
1463 struct md_cluster_info *cinfo = mddev->cluster_info;
1464 struct cluster_msg cmsg;
1465 int ret = 0;
1466 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1467 char *uuid = sb->device_uuid;
1468
1469 memset(&cmsg, 0, sizeof(cmsg));
1470 cmsg.type = cpu_to_le32(NEWDISK);
1471 memcpy(cmsg.uuid, uuid, 16);
1472 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1473 if (lock_comm(cinfo, 1))
1474 return -EAGAIN;
1475 ret = __sendmsg(cinfo, &cmsg);
1476 if (ret) {
1477 unlock_comm(cinfo);
1478 return ret;
1479 }
1480 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
1481 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
1482 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
1483 /* Some node does not "see" the device */
1484 if (ret == -EAGAIN)
1485 ret = -ENOENT;
1486 if (ret)
1487 unlock_comm(cinfo);
1488 else {
1489 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
1490 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
1491 * will run soon after add_new_disk, the below path will be
1492 * invoked:
1493 * md_wakeup_thread(mddev->thread)
1494 * -> conf->thread (raid1d)
1495 * -> md_check_recovery -> md_update_sb
1496 * -> metadata_update_start/finish
1497 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
1498 *
1499 * For other failure cases, metadata_update_cancel and
1500 * add_new_disk_cancel also clear below bit as well.
1501 * */
1502 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1503 wake_up(&cinfo->wait);
1504 }
1505 return ret;
1506}
1507
1508static void add_new_disk_cancel(struct mddev *mddev)
1509{
1510 struct md_cluster_info *cinfo = mddev->cluster_info;
1511 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1512 unlock_comm(cinfo);
1513}
1514
1515static int new_disk_ack(struct mddev *mddev, bool ack)
1516{
1517 struct md_cluster_info *cinfo = mddev->cluster_info;
1518
1519 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
1520 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
1521 return -EINVAL;
1522 }
1523
1524 if (ack)
1525 dlm_unlock_sync(cinfo->no_new_dev_lockres);
1526 complete(&cinfo->newdisk_completion);
1527 return 0;
1528}
1529
1530static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
1531{
1532 struct cluster_msg cmsg = {0};
1533 struct md_cluster_info *cinfo = mddev->cluster_info;
1534 cmsg.type = cpu_to_le32(REMOVE);
1535 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1536 return sendmsg(cinfo, &cmsg, 1);
1537}
1538
1539static int lock_all_bitmaps(struct mddev *mddev)
1540{
1541 int slot, my_slot, ret, held = 1, i = 0;
1542 char str[64];
1543 struct md_cluster_info *cinfo = mddev->cluster_info;
1544
1545 cinfo->other_bitmap_lockres =
1546 kzalloc_objs(struct dlm_lock_resource *,
1547 mddev->bitmap_info.nodes - 1);
1548 if (!cinfo->other_bitmap_lockres) {
1549 pr_err("md: can't alloc mem for other bitmap locks\n");
1550 return 0;
1551 }
1552
1553 my_slot = slot_number(mddev);
1554 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
1555 if (slot == my_slot)
1556 continue;
1557
1558 memset(str, '\0', 64);
1559 snprintf(str, 64, "bitmap%04d", slot);
1560 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
1561 if (!cinfo->other_bitmap_lockres[i])
1562 return -ENOMEM;
1563
1564 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
1565 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
1566 if (ret)
1567 held = -1;
1568 i++;
1569 }
1570
1571 return held;
1572}
1573
1574static void unlock_all_bitmaps(struct mddev *mddev)
1575{
1576 struct md_cluster_info *cinfo = mddev->cluster_info;
1577 int i;
1578
1579 /* release other node's bitmap lock if they are existed */
1580 if (cinfo->other_bitmap_lockres) {
1581 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
1582 if (cinfo->other_bitmap_lockres[i]) {
1583 lockres_free(cinfo->other_bitmap_lockres[i]);
1584 }
1585 }
1586 kfree(cinfo->other_bitmap_lockres);
1587 cinfo->other_bitmap_lockres = NULL;
1588 }
1589}
1590
1591static int gather_bitmaps(struct md_rdev *rdev)
1592{
1593 int sn, err;
1594 sector_t lo, hi;
1595 struct cluster_msg cmsg = {0};
1596 struct mddev *mddev = rdev->mddev;
1597 struct md_cluster_info *cinfo = mddev->cluster_info;
1598
1599 cmsg.type = cpu_to_le32(RE_ADD);
1600 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1601 err = sendmsg(cinfo, &cmsg, 1);
1602 if (err)
1603 goto out;
1604
1605 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1606 if (sn == (cinfo->slot_number - 1))
1607 continue;
1608 err = mddev->bitmap_ops->copy_from_slot(mddev, sn, &lo, &hi, false);
1609 if (err) {
1610 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1611 goto out;
1612 }
1613 if ((hi > 0) && (lo < mddev->resync_offset))
1614 mddev->resync_offset = lo;
1615 }
1616out:
1617 return err;
1618}
1619
1620static struct md_cluster_operations cluster_ops = {
1621 .head = {
1622 .type = MD_CLUSTER,
1623 .id = ID_CLUSTER,
1624 .name = "cluster",
1625 .owner = THIS_MODULE,
1626 },
1627
1628 .join = join,
1629 .leave = leave,
1630 .slot_number = slot_number,
1631 .resync_start = resync_start,
1632 .resync_finish = resync_finish,
1633 .resync_info_update = resync_info_update,
1634 .resync_start_notify = resync_start_notify,
1635 .resync_status_get = resync_status_get,
1636 .resync_info_get = resync_info_get,
1637 .metadata_update_start = metadata_update_start,
1638 .metadata_update_finish = metadata_update_finish,
1639 .metadata_update_cancel = metadata_update_cancel,
1640 .area_resyncing = area_resyncing,
1641 .add_new_disk = add_new_disk,
1642 .add_new_disk_cancel = add_new_disk_cancel,
1643 .new_disk_ack = new_disk_ack,
1644 .remove_disk = remove_disk,
1645 .load_bitmaps = load_bitmaps,
1646 .gather_bitmaps = gather_bitmaps,
1647 .resize_bitmaps = resize_bitmaps,
1648 .lock_all_bitmaps = lock_all_bitmaps,
1649 .unlock_all_bitmaps = unlock_all_bitmaps,
1650 .update_size = update_size,
1651};
1652
1653static int __init cluster_init(void)
1654{
1655 pr_warn("md-cluster: support raid1 and raid10 (limited support)\n");
1656 pr_info("Registering Cluster MD functions\n");
1657 return register_md_submodule(&cluster_ops.head);
1658}
1659
1660static void cluster_exit(void)
1661{
1662 unregister_md_submodule(&cluster_ops.head);
1663}
1664
1665module_init(cluster_init);
1666module_exit(cluster_exit);
1667MODULE_AUTHOR("SUSE");
1668MODULE_LICENSE("GPL");
1669MODULE_DESCRIPTION("Clustering support for MD");