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