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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 *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 *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 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
366 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 void 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
513 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
514 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
515 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
516 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
517 init_completion(&cinfo->newdisk_completion);
518 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
519 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
520 wait_for_completion_timeout(&cinfo->newdisk_completion,
521 NEW_DEV_TIMEOUT);
522 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
523}
524
525
526static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
527{
528 int got_lock = 0;
529 struct md_cluster_info *cinfo = mddev->cluster_info;
530 mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
531
532 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
533 wait_event(mddev->thread->wqueue,
534 (got_lock = mddev_trylock(mddev)) ||
535 test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state));
536 md_reload_sb(mddev, mddev->good_device_nr);
537 if (got_lock)
538 mddev_unlock(mddev);
539}
540
541static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
542{
543 struct md_rdev *rdev;
544
545 rcu_read_lock();
546 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
547 if (rdev) {
548 set_bit(ClusterRemove, &rdev->flags);
549 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
550 md_wakeup_thread(mddev->thread);
551 }
552 else
553 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
554 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
555 rcu_read_unlock();
556}
557
558static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
559{
560 struct md_rdev *rdev;
561
562 rcu_read_lock();
563 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
564 if (rdev && test_bit(Faulty, &rdev->flags))
565 clear_bit(Faulty, &rdev->flags);
566 else
567 pr_warn("%s: %d Could not find disk(%d) which is faulty",
568 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
569 rcu_read_unlock();
570}
571
572static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
573{
574 int ret = 0;
575
576 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
577 "node %d received its own msg\n", le32_to_cpu(msg->slot)))
578 return -1;
579 switch (le32_to_cpu(msg->type)) {
580 case METADATA_UPDATED:
581 process_metadata_update(mddev, msg);
582 break;
583 case CHANGE_CAPACITY:
584 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
585 break;
586 case RESYNCING:
587 set_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
588 process_suspend_info(mddev, le32_to_cpu(msg->slot),
589 le64_to_cpu(msg->low),
590 le64_to_cpu(msg->high));
591 break;
592 case NEWDISK:
593 process_add_new_disk(mddev, msg);
594 break;
595 case REMOVE:
596 process_remove_disk(mddev, msg);
597 break;
598 case RE_ADD:
599 process_readd_disk(mddev, msg);
600 break;
601 case BITMAP_NEEDS_SYNC:
602 __recover_slot(mddev, le32_to_cpu(msg->slot));
603 break;
604 case BITMAP_RESIZE:
605 if (le64_to_cpu(msg->high) != mddev->pers->size(mddev, 0, 0))
606 ret = md_bitmap_resize(mddev->bitmap,
607 le64_to_cpu(msg->high), 0, 0);
608 break;
609 default:
610 ret = -1;
611 pr_warn("%s:%d Received unknown message from %d\n",
612 __func__, __LINE__, msg->slot);
613 }
614 return ret;
615}
616
617/*
618 * thread for receiving message
619 */
620static void recv_daemon(struct md_thread *thread)
621{
622 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
623 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
624 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
625 struct cluster_msg msg;
626 int ret;
627
628 mutex_lock(&cinfo->recv_mutex);
629 /*get CR on Message*/
630 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
631 pr_err("md/raid1:failed to get CR on MESSAGE\n");
632 mutex_unlock(&cinfo->recv_mutex);
633 return;
634 }
635
636 /* read lvb and wake up thread to process this message_lockres */
637 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
638 ret = process_recvd_msg(thread->mddev, &msg);
639 if (ret)
640 goto out;
641
642 /*release CR on ack_lockres*/
643 ret = dlm_unlock_sync(ack_lockres);
644 if (unlikely(ret != 0))
645 pr_info("unlock ack failed return %d\n", ret);
646 /*up-convert to PR on message_lockres*/
647 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
648 if (unlikely(ret != 0))
649 pr_info("lock PR on msg failed return %d\n", ret);
650 /*get CR on ack_lockres again*/
651 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
652 if (unlikely(ret != 0))
653 pr_info("lock CR on ack failed return %d\n", ret);
654out:
655 /*release CR on message_lockres*/
656 ret = dlm_unlock_sync(message_lockres);
657 if (unlikely(ret != 0))
658 pr_info("unlock msg failed return %d\n", ret);
659 mutex_unlock(&cinfo->recv_mutex);
660}
661
662/* lock_token()
663 * Takes the lock on the TOKEN lock resource so no other
664 * node can communicate while the operation is underway.
665 */
666static int lock_token(struct md_cluster_info *cinfo)
667{
668 int error;
669
670 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
671 if (error) {
672 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
673 __func__, __LINE__, error);
674 } else {
675 /* Lock the receive sequence */
676 mutex_lock(&cinfo->recv_mutex);
677 }
678 return error;
679}
680
681/* lock_comm()
682 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
683 */
684static int lock_comm(struct md_cluster_info *cinfo, bool mddev_locked)
685{
686 int rv, set_bit = 0;
687 struct mddev *mddev = cinfo->mddev;
688
689 /*
690 * If resync thread run after raid1d thread, then process_metadata_update
691 * could not continue if raid1d held reconfig_mutex (and raid1d is blocked
692 * since another node already got EX on Token and waiting the EX of Ack),
693 * so let resync wake up thread in case flag is set.
694 */
695 if (mddev_locked && !test_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
696 &cinfo->state)) {
697 rv = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
698 &cinfo->state);
699 WARN_ON_ONCE(rv);
700 md_wakeup_thread(mddev->thread);
701 set_bit = 1;
702 }
703
704 wait_event(cinfo->wait,
705 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
706 rv = lock_token(cinfo);
707 if (set_bit)
708 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
709 return rv;
710}
711
712static void unlock_comm(struct md_cluster_info *cinfo)
713{
714 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
715 mutex_unlock(&cinfo->recv_mutex);
716 dlm_unlock_sync(cinfo->token_lockres);
717 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
718 wake_up(&cinfo->wait);
719}
720
721/* __sendmsg()
722 * This function performs the actual sending of the message. This function is
723 * usually called after performing the encompassing operation
724 * The function:
725 * 1. Grabs the message lockresource in EX mode
726 * 2. Copies the message to the message LVB
727 * 3. Downconverts message lockresource to CW
728 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
729 * and the other nodes read the message. The thread will wait here until all other
730 * nodes have released ack lock resource.
731 * 5. Downconvert ack lockresource to CR
732 */
733static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
734{
735 int error;
736 int slot = cinfo->slot_number - 1;
737
738 cmsg->slot = cpu_to_le32(slot);
739 /*get EX on Message*/
740 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
741 if (error) {
742 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
743 goto failed_message;
744 }
745
746 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
747 sizeof(struct cluster_msg));
748 /*down-convert EX to CW on Message*/
749 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
750 if (error) {
751 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
752 error);
753 goto failed_ack;
754 }
755
756 /*up-convert CR to EX on Ack*/
757 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
758 if (error) {
759 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
760 error);
761 goto failed_ack;
762 }
763
764 /*down-convert EX to CR on Ack*/
765 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
766 if (error) {
767 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
768 error);
769 goto failed_ack;
770 }
771
772failed_ack:
773 error = dlm_unlock_sync(cinfo->message_lockres);
774 if (unlikely(error != 0)) {
775 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
776 error);
777 /* in case the message can't be released due to some reason */
778 goto failed_ack;
779 }
780failed_message:
781 return error;
782}
783
784static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg,
785 bool mddev_locked)
786{
787 int ret;
788
789 ret = lock_comm(cinfo, mddev_locked);
790 if (!ret) {
791 ret = __sendmsg(cinfo, cmsg);
792 unlock_comm(cinfo);
793 }
794 return ret;
795}
796
797static int gather_all_resync_info(struct mddev *mddev, int total_slots)
798{
799 struct md_cluster_info *cinfo = mddev->cluster_info;
800 int i, ret = 0;
801 struct dlm_lock_resource *bm_lockres;
802 char str[64];
803 sector_t lo, hi;
804
805
806 for (i = 0; i < total_slots; i++) {
807 memset(str, '\0', 64);
808 snprintf(str, 64, "bitmap%04d", i);
809 bm_lockres = lockres_init(mddev, str, NULL, 1);
810 if (!bm_lockres)
811 return -ENOMEM;
812 if (i == (cinfo->slot_number - 1)) {
813 lockres_free(bm_lockres);
814 continue;
815 }
816
817 bm_lockres->flags |= DLM_LKF_NOQUEUE;
818 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
819 if (ret == -EAGAIN) {
820 if (read_resync_info(mddev, bm_lockres)) {
821 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
822 __func__, __LINE__,
823 (unsigned long long) cinfo->suspend_lo,
824 (unsigned long long) cinfo->suspend_hi,
825 i);
826 cinfo->suspend_from = i;
827 }
828 ret = 0;
829 lockres_free(bm_lockres);
830 continue;
831 }
832 if (ret) {
833 lockres_free(bm_lockres);
834 goto out;
835 }
836
837 /* Read the disk bitmap sb and check if it needs recovery */
838 ret = md_bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
839 if (ret) {
840 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
841 lockres_free(bm_lockres);
842 continue;
843 }
844 if ((hi > 0) && (lo < mddev->recovery_cp)) {
845 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
846 mddev->recovery_cp = lo;
847 md_check_recovery(mddev);
848 }
849
850 lockres_free(bm_lockres);
851 }
852out:
853 return ret;
854}
855
856static int join(struct mddev *mddev, int nodes)
857{
858 struct md_cluster_info *cinfo;
859 int ret, ops_rv;
860 char str[64];
861
862 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
863 if (!cinfo)
864 return -ENOMEM;
865
866 INIT_LIST_HEAD(&cinfo->suspend_list);
867 spin_lock_init(&cinfo->suspend_lock);
868 init_completion(&cinfo->completion);
869 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
870 init_waitqueue_head(&cinfo->wait);
871 mutex_init(&cinfo->recv_mutex);
872
873 mddev->cluster_info = cinfo;
874 cinfo->mddev = mddev;
875
876 memset(str, 0, 64);
877 sprintf(str, "%pU", mddev->uuid);
878 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
879 0, LVB_SIZE, &md_ls_ops, mddev,
880 &ops_rv, &cinfo->lockspace);
881 if (ret)
882 goto err;
883 wait_for_completion(&cinfo->completion);
884 if (nodes < cinfo->slot_number) {
885 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
886 cinfo->slot_number, nodes);
887 ret = -ERANGE;
888 goto err;
889 }
890 /* Initiate the communication resources */
891 ret = -ENOMEM;
892 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
893 if (!cinfo->recv_thread) {
894 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
895 goto err;
896 }
897 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
898 if (!cinfo->message_lockres)
899 goto err;
900 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
901 if (!cinfo->token_lockres)
902 goto err;
903 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
904 if (!cinfo->no_new_dev_lockres)
905 goto err;
906
907 ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
908 if (ret) {
909 ret = -EAGAIN;
910 pr_err("md-cluster: can't join cluster to avoid lock issue\n");
911 goto err;
912 }
913 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
914 if (!cinfo->ack_lockres) {
915 ret = -ENOMEM;
916 goto err;
917 }
918 /* get sync CR lock on ACK. */
919 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
920 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
921 ret);
922 dlm_unlock_sync(cinfo->token_lockres);
923 /* get sync CR lock on no-new-dev. */
924 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
925 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
926
927
928 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
929 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
930 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
931 if (!cinfo->bitmap_lockres) {
932 ret = -ENOMEM;
933 goto err;
934 }
935 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
936 pr_err("Failed to get bitmap lock\n");
937 ret = -EINVAL;
938 goto err;
939 }
940
941 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
942 if (!cinfo->resync_lockres) {
943 ret = -ENOMEM;
944 goto err;
945 }
946
947 return 0;
948err:
949 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
950 md_unregister_thread(&cinfo->recovery_thread);
951 md_unregister_thread(&cinfo->recv_thread);
952 lockres_free(cinfo->message_lockres);
953 lockres_free(cinfo->token_lockres);
954 lockres_free(cinfo->ack_lockres);
955 lockres_free(cinfo->no_new_dev_lockres);
956 lockres_free(cinfo->resync_lockres);
957 lockres_free(cinfo->bitmap_lockres);
958 if (cinfo->lockspace)
959 dlm_release_lockspace(cinfo->lockspace, 2);
960 mddev->cluster_info = NULL;
961 kfree(cinfo);
962 return ret;
963}
964
965static void load_bitmaps(struct mddev *mddev, int total_slots)
966{
967 struct md_cluster_info *cinfo = mddev->cluster_info;
968
969 /* load all the node's bitmap info for resync */
970 if (gather_all_resync_info(mddev, total_slots))
971 pr_err("md-cluster: failed to gather all resyn infos\n");
972 set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state);
973 /* wake up recv thread in case something need to be handled */
974 if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state))
975 md_wakeup_thread(cinfo->recv_thread);
976}
977
978static void resync_bitmap(struct mddev *mddev)
979{
980 struct md_cluster_info *cinfo = mddev->cluster_info;
981 struct cluster_msg cmsg = {0};
982 int err;
983
984 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
985 err = sendmsg(cinfo, &cmsg, 1);
986 if (err)
987 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
988 __func__, __LINE__, err);
989}
990
991static void unlock_all_bitmaps(struct mddev *mddev);
992static int leave(struct mddev *mddev)
993{
994 struct md_cluster_info *cinfo = mddev->cluster_info;
995
996 if (!cinfo)
997 return 0;
998
999 /*
1000 * BITMAP_NEEDS_SYNC message should be sent when node
1001 * is leaving the cluster with dirty bitmap, also we
1002 * can only deliver it when dlm connection is available.
1003 *
1004 * Also, we should send BITMAP_NEEDS_SYNC message in
1005 * case reshaping is interrupted.
1006 */
1007 if ((cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector) ||
1008 (mddev->reshape_position != MaxSector &&
1009 test_bit(MD_CLOSING, &mddev->flags)))
1010 resync_bitmap(mddev);
1011
1012 set_bit(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1013 md_unregister_thread(&cinfo->recovery_thread);
1014 md_unregister_thread(&cinfo->recv_thread);
1015 lockres_free(cinfo->message_lockres);
1016 lockres_free(cinfo->token_lockres);
1017 lockres_free(cinfo->ack_lockres);
1018 lockres_free(cinfo->no_new_dev_lockres);
1019 lockres_free(cinfo->resync_lockres);
1020 lockres_free(cinfo->bitmap_lockres);
1021 unlock_all_bitmaps(mddev);
1022 dlm_release_lockspace(cinfo->lockspace, 2);
1023 kfree(cinfo);
1024 return 0;
1025}
1026
1027/* slot_number(): Returns the MD slot number to use
1028 * DLM starts the slot numbers from 1, wheras cluster-md
1029 * wants the number to be from zero, so we deduct one
1030 */
1031static int slot_number(struct mddev *mddev)
1032{
1033 struct md_cluster_info *cinfo = mddev->cluster_info;
1034
1035 return cinfo->slot_number - 1;
1036}
1037
1038/*
1039 * Check if the communication is already locked, else lock the communication
1040 * channel.
1041 * If it is already locked, token is in EX mode, and hence lock_token()
1042 * should not be called.
1043 */
1044static int metadata_update_start(struct mddev *mddev)
1045{
1046 struct md_cluster_info *cinfo = mddev->cluster_info;
1047 int ret;
1048
1049 /*
1050 * metadata_update_start is always called with the protection of
1051 * reconfig_mutex, so set WAITING_FOR_TOKEN here.
1052 */
1053 ret = test_and_set_bit_lock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD,
1054 &cinfo->state);
1055 WARN_ON_ONCE(ret);
1056 md_wakeup_thread(mddev->thread);
1057
1058 wait_event(cinfo->wait,
1059 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
1060 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
1061
1062 /* If token is already locked, return 0 */
1063 if (cinfo->token_lockres->mode == DLM_LOCK_EX) {
1064 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1065 return 0;
1066 }
1067
1068 ret = lock_token(cinfo);
1069 clear_bit_unlock(MD_CLUSTER_HOLDING_MUTEX_FOR_RECVD, &cinfo->state);
1070 return ret;
1071}
1072
1073static int metadata_update_finish(struct mddev *mddev)
1074{
1075 struct md_cluster_info *cinfo = mddev->cluster_info;
1076 struct cluster_msg cmsg;
1077 struct md_rdev *rdev;
1078 int ret = 0;
1079 int raid_slot = -1;
1080
1081 memset(&cmsg, 0, sizeof(cmsg));
1082 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1083 /* Pick up a good active device number to send.
1084 */
1085 rdev_for_each(rdev, mddev)
1086 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
1087 raid_slot = rdev->desc_nr;
1088 break;
1089 }
1090 if (raid_slot >= 0) {
1091 cmsg.raid_slot = cpu_to_le32(raid_slot);
1092 ret = __sendmsg(cinfo, &cmsg);
1093 } else
1094 pr_warn("md-cluster: No good device id found to send\n");
1095 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1096 unlock_comm(cinfo);
1097 return ret;
1098}
1099
1100static void metadata_update_cancel(struct mddev *mddev)
1101{
1102 struct md_cluster_info *cinfo = mddev->cluster_info;
1103 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1104 unlock_comm(cinfo);
1105}
1106
1107static int update_bitmap_size(struct mddev *mddev, sector_t size)
1108{
1109 struct md_cluster_info *cinfo = mddev->cluster_info;
1110 struct cluster_msg cmsg = {0};
1111 int ret;
1112
1113 cmsg.type = cpu_to_le32(BITMAP_RESIZE);
1114 cmsg.high = cpu_to_le64(size);
1115 ret = sendmsg(cinfo, &cmsg, 0);
1116 if (ret)
1117 pr_err("%s:%d: failed to send BITMAP_RESIZE message (%d)\n",
1118 __func__, __LINE__, ret);
1119 return ret;
1120}
1121
1122static int resize_bitmaps(struct mddev *mddev, sector_t newsize, sector_t oldsize)
1123{
1124 struct bitmap_counts *counts;
1125 char str[64];
1126 struct dlm_lock_resource *bm_lockres;
1127 struct bitmap *bitmap = mddev->bitmap;
1128 unsigned long my_pages = bitmap->counts.pages;
1129 int i, rv;
1130
1131 /*
1132 * We need to ensure all the nodes can grow to a larger
1133 * bitmap size before make the reshaping.
1134 */
1135 rv = update_bitmap_size(mddev, newsize);
1136 if (rv)
1137 return rv;
1138
1139 for (i = 0; i < mddev->bitmap_info.nodes; i++) {
1140 if (i == md_cluster_ops->slot_number(mddev))
1141 continue;
1142
1143 bitmap = get_bitmap_from_slot(mddev, i);
1144 if (IS_ERR(bitmap)) {
1145 pr_err("can't get bitmap from slot %d\n", i);
1146 bitmap = NULL;
1147 goto out;
1148 }
1149 counts = &bitmap->counts;
1150
1151 /*
1152 * If we can hold the bitmap lock of one node then
1153 * the slot is not occupied, update the pages.
1154 */
1155 snprintf(str, 64, "bitmap%04d", i);
1156 bm_lockres = lockres_init(mddev, str, NULL, 1);
1157 if (!bm_lockres) {
1158 pr_err("Cannot initialize %s lock\n", str);
1159 goto out;
1160 }
1161 bm_lockres->flags |= DLM_LKF_NOQUEUE;
1162 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
1163 if (!rv)
1164 counts->pages = my_pages;
1165 lockres_free(bm_lockres);
1166
1167 if (my_pages != counts->pages)
1168 /*
1169 * Let's revert the bitmap size if one node
1170 * can't resize bitmap
1171 */
1172 goto out;
1173 md_bitmap_free(bitmap);
1174 }
1175
1176 return 0;
1177out:
1178 md_bitmap_free(bitmap);
1179 update_bitmap_size(mddev, oldsize);
1180 return -1;
1181}
1182
1183/*
1184 * return 0 if all the bitmaps have the same sync_size
1185 */
1186static int cluster_check_sync_size(struct mddev *mddev)
1187{
1188 int i, rv;
1189 bitmap_super_t *sb;
1190 unsigned long my_sync_size, sync_size = 0;
1191 int node_num = mddev->bitmap_info.nodes;
1192 int current_slot = md_cluster_ops->slot_number(mddev);
1193 struct bitmap *bitmap = mddev->bitmap;
1194 char str[64];
1195 struct dlm_lock_resource *bm_lockres;
1196
1197 sb = kmap_atomic(bitmap->storage.sb_page);
1198 my_sync_size = sb->sync_size;
1199 kunmap_atomic(sb);
1200
1201 for (i = 0; i < node_num; i++) {
1202 if (i == current_slot)
1203 continue;
1204
1205 bitmap = get_bitmap_from_slot(mddev, i);
1206 if (IS_ERR(bitmap)) {
1207 pr_err("can't get bitmap from slot %d\n", i);
1208 return -1;
1209 }
1210
1211 /*
1212 * If we can hold the bitmap lock of one node then
1213 * the slot is not occupied, update the sb.
1214 */
1215 snprintf(str, 64, "bitmap%04d", i);
1216 bm_lockres = lockres_init(mddev, str, NULL, 1);
1217 if (!bm_lockres) {
1218 pr_err("md-cluster: Cannot initialize %s\n", str);
1219 md_bitmap_free(bitmap);
1220 return -1;
1221 }
1222 bm_lockres->flags |= DLM_LKF_NOQUEUE;
1223 rv = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
1224 if (!rv)
1225 md_bitmap_update_sb(bitmap);
1226 lockres_free(bm_lockres);
1227
1228 sb = kmap_atomic(bitmap->storage.sb_page);
1229 if (sync_size == 0)
1230 sync_size = sb->sync_size;
1231 else if (sync_size != sb->sync_size) {
1232 kunmap_atomic(sb);
1233 md_bitmap_free(bitmap);
1234 return -1;
1235 }
1236 kunmap_atomic(sb);
1237 md_bitmap_free(bitmap);
1238 }
1239
1240 return (my_sync_size == sync_size) ? 0 : -1;
1241}
1242
1243/*
1244 * Update the size for cluster raid is a little more complex, we perform it
1245 * by the steps:
1246 * 1. hold token lock and update superblock in initiator node.
1247 * 2. send METADATA_UPDATED msg to other nodes.
1248 * 3. The initiator node continues to check each bitmap's sync_size, if all
1249 * bitmaps have the same value of sync_size, then we can set capacity and
1250 * let other nodes to perform it. If one node can't update sync_size
1251 * accordingly, we need to revert to previous value.
1252 */
1253static void update_size(struct mddev *mddev, sector_t old_dev_sectors)
1254{
1255 struct md_cluster_info *cinfo = mddev->cluster_info;
1256 struct cluster_msg cmsg;
1257 struct md_rdev *rdev;
1258 int ret = 0;
1259 int raid_slot = -1;
1260
1261 md_update_sb(mddev, 1);
1262 if (lock_comm(cinfo, 1)) {
1263 pr_err("%s: lock_comm failed\n", __func__);
1264 return;
1265 }
1266
1267 memset(&cmsg, 0, sizeof(cmsg));
1268 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1269 rdev_for_each(rdev, mddev)
1270 if (rdev->raid_disk >= 0 && !test_bit(Faulty, &rdev->flags)) {
1271 raid_slot = rdev->desc_nr;
1272 break;
1273 }
1274 if (raid_slot >= 0) {
1275 cmsg.raid_slot = cpu_to_le32(raid_slot);
1276 /*
1277 * We can only change capiticy after all the nodes can do it,
1278 * so need to wait after other nodes already received the msg
1279 * and handled the change
1280 */
1281 ret = __sendmsg(cinfo, &cmsg);
1282 if (ret) {
1283 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1284 __func__, __LINE__);
1285 unlock_comm(cinfo);
1286 return;
1287 }
1288 } else {
1289 pr_err("md-cluster: No good device id found to send\n");
1290 unlock_comm(cinfo);
1291 return;
1292 }
1293
1294 /*
1295 * check the sync_size from other node's bitmap, if sync_size
1296 * have already updated in other nodes as expected, send an
1297 * empty metadata msg to permit the change of capacity
1298 */
1299 if (cluster_check_sync_size(mddev) == 0) {
1300 memset(&cmsg, 0, sizeof(cmsg));
1301 cmsg.type = cpu_to_le32(CHANGE_CAPACITY);
1302 ret = __sendmsg(cinfo, &cmsg);
1303 if (ret)
1304 pr_err("%s:%d: failed to send CHANGE_CAPACITY msg\n",
1305 __func__, __LINE__);
1306 set_capacity_and_notify(mddev->gendisk, mddev->array_sectors);
1307 } else {
1308 /* revert to previous sectors */
1309 ret = mddev->pers->resize(mddev, old_dev_sectors);
1310 ret = __sendmsg(cinfo, &cmsg);
1311 if (ret)
1312 pr_err("%s:%d: failed to send METADATA_UPDATED msg\n",
1313 __func__, __LINE__);
1314 }
1315 unlock_comm(cinfo);
1316}
1317
1318static int resync_start(struct mddev *mddev)
1319{
1320 struct md_cluster_info *cinfo = mddev->cluster_info;
1321 return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev);
1322}
1323
1324static void resync_info_get(struct mddev *mddev, sector_t *lo, sector_t *hi)
1325{
1326 struct md_cluster_info *cinfo = mddev->cluster_info;
1327
1328 spin_lock_irq(&cinfo->suspend_lock);
1329 *lo = cinfo->suspend_lo;
1330 *hi = cinfo->suspend_hi;
1331 spin_unlock_irq(&cinfo->suspend_lock);
1332}
1333
1334static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
1335{
1336 struct md_cluster_info *cinfo = mddev->cluster_info;
1337 struct resync_info ri;
1338 struct cluster_msg cmsg = {0};
1339
1340 /* do not send zero again, if we have sent before */
1341 if (hi == 0) {
1342 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
1343 if (le64_to_cpu(ri.hi) == 0)
1344 return 0;
1345 }
1346
1347 add_resync_info(cinfo->bitmap_lockres, lo, hi);
1348 /* Re-acquire the lock to refresh LVB */
1349 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
1350 cmsg.type = cpu_to_le32(RESYNCING);
1351 cmsg.low = cpu_to_le64(lo);
1352 cmsg.high = cpu_to_le64(hi);
1353
1354 /*
1355 * mddev_lock is held if resync_info_update is called from
1356 * resync_finish (md_reap_sync_thread -> resync_finish)
1357 */
1358 if (lo == 0 && hi == 0)
1359 return sendmsg(cinfo, &cmsg, 1);
1360 else
1361 return sendmsg(cinfo, &cmsg, 0);
1362}
1363
1364static int resync_finish(struct mddev *mddev)
1365{
1366 struct md_cluster_info *cinfo = mddev->cluster_info;
1367 int ret = 0;
1368
1369 clear_bit(MD_RESYNCING_REMOTE, &mddev->recovery);
1370
1371 /*
1372 * If resync thread is interrupted so we can't say resync is finished,
1373 * another node will launch resync thread to continue.
1374 */
1375 if (!test_bit(MD_CLOSING, &mddev->flags))
1376 ret = resync_info_update(mddev, 0, 0);
1377 dlm_unlock_sync(cinfo->resync_lockres);
1378 return ret;
1379}
1380
1381static int area_resyncing(struct mddev *mddev, int direction,
1382 sector_t lo, sector_t hi)
1383{
1384 struct md_cluster_info *cinfo = mddev->cluster_info;
1385 int ret = 0;
1386
1387 if ((direction == READ) &&
1388 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
1389 return 1;
1390
1391 spin_lock_irq(&cinfo->suspend_lock);
1392 if (hi > cinfo->suspend_lo && lo < cinfo->suspend_hi)
1393 ret = 1;
1394 spin_unlock_irq(&cinfo->suspend_lock);
1395 return ret;
1396}
1397
1398/* add_new_disk() - initiates a disk add
1399 * However, if this fails before writing md_update_sb(),
1400 * add_new_disk_cancel() must be called to release token lock
1401 */
1402static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
1403{
1404 struct md_cluster_info *cinfo = mddev->cluster_info;
1405 struct cluster_msg cmsg;
1406 int ret = 0;
1407 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1408 char *uuid = sb->device_uuid;
1409
1410 memset(&cmsg, 0, sizeof(cmsg));
1411 cmsg.type = cpu_to_le32(NEWDISK);
1412 memcpy(cmsg.uuid, uuid, 16);
1413 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1414 if (lock_comm(cinfo, 1))
1415 return -EAGAIN;
1416 ret = __sendmsg(cinfo, &cmsg);
1417 if (ret) {
1418 unlock_comm(cinfo);
1419 return ret;
1420 }
1421 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
1422 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
1423 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
1424 /* Some node does not "see" the device */
1425 if (ret == -EAGAIN)
1426 ret = -ENOENT;
1427 if (ret)
1428 unlock_comm(cinfo);
1429 else {
1430 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
1431 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
1432 * will run soon after add_new_disk, the below path will be
1433 * invoked:
1434 * md_wakeup_thread(mddev->thread)
1435 * -> conf->thread (raid1d)
1436 * -> md_check_recovery -> md_update_sb
1437 * -> metadata_update_start/finish
1438 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
1439 *
1440 * For other failure cases, metadata_update_cancel and
1441 * add_new_disk_cancel also clear below bit as well.
1442 * */
1443 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1444 wake_up(&cinfo->wait);
1445 }
1446 return ret;
1447}
1448
1449static void add_new_disk_cancel(struct mddev *mddev)
1450{
1451 struct md_cluster_info *cinfo = mddev->cluster_info;
1452 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1453 unlock_comm(cinfo);
1454}
1455
1456static int new_disk_ack(struct mddev *mddev, bool ack)
1457{
1458 struct md_cluster_info *cinfo = mddev->cluster_info;
1459
1460 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
1461 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
1462 return -EINVAL;
1463 }
1464
1465 if (ack)
1466 dlm_unlock_sync(cinfo->no_new_dev_lockres);
1467 complete(&cinfo->newdisk_completion);
1468 return 0;
1469}
1470
1471static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
1472{
1473 struct cluster_msg cmsg = {0};
1474 struct md_cluster_info *cinfo = mddev->cluster_info;
1475 cmsg.type = cpu_to_le32(REMOVE);
1476 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1477 return sendmsg(cinfo, &cmsg, 1);
1478}
1479
1480static int lock_all_bitmaps(struct mddev *mddev)
1481{
1482 int slot, my_slot, ret, held = 1, i = 0;
1483 char str[64];
1484 struct md_cluster_info *cinfo = mddev->cluster_info;
1485
1486 cinfo->other_bitmap_lockres =
1487 kcalloc(mddev->bitmap_info.nodes - 1,
1488 sizeof(struct dlm_lock_resource *), GFP_KERNEL);
1489 if (!cinfo->other_bitmap_lockres) {
1490 pr_err("md: can't alloc mem for other bitmap locks\n");
1491 return 0;
1492 }
1493
1494 my_slot = slot_number(mddev);
1495 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
1496 if (slot == my_slot)
1497 continue;
1498
1499 memset(str, '\0', 64);
1500 snprintf(str, 64, "bitmap%04d", slot);
1501 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
1502 if (!cinfo->other_bitmap_lockres[i])
1503 return -ENOMEM;
1504
1505 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
1506 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
1507 if (ret)
1508 held = -1;
1509 i++;
1510 }
1511
1512 return held;
1513}
1514
1515static void unlock_all_bitmaps(struct mddev *mddev)
1516{
1517 struct md_cluster_info *cinfo = mddev->cluster_info;
1518 int i;
1519
1520 /* release other node's bitmap lock if they are existed */
1521 if (cinfo->other_bitmap_lockres) {
1522 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
1523 if (cinfo->other_bitmap_lockres[i]) {
1524 lockres_free(cinfo->other_bitmap_lockres[i]);
1525 }
1526 }
1527 kfree(cinfo->other_bitmap_lockres);
1528 cinfo->other_bitmap_lockres = NULL;
1529 }
1530}
1531
1532static int gather_bitmaps(struct md_rdev *rdev)
1533{
1534 int sn, err;
1535 sector_t lo, hi;
1536 struct cluster_msg cmsg = {0};
1537 struct mddev *mddev = rdev->mddev;
1538 struct md_cluster_info *cinfo = mddev->cluster_info;
1539
1540 cmsg.type = cpu_to_le32(RE_ADD);
1541 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1542 err = sendmsg(cinfo, &cmsg, 1);
1543 if (err)
1544 goto out;
1545
1546 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1547 if (sn == (cinfo->slot_number - 1))
1548 continue;
1549 err = md_bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
1550 if (err) {
1551 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1552 goto out;
1553 }
1554 if ((hi > 0) && (lo < mddev->recovery_cp))
1555 mddev->recovery_cp = lo;
1556 }
1557out:
1558 return err;
1559}
1560
1561static struct md_cluster_operations cluster_ops = {
1562 .join = join,
1563 .leave = leave,
1564 .slot_number = slot_number,
1565 .resync_start = resync_start,
1566 .resync_finish = resync_finish,
1567 .resync_info_update = resync_info_update,
1568 .resync_info_get = resync_info_get,
1569 .metadata_update_start = metadata_update_start,
1570 .metadata_update_finish = metadata_update_finish,
1571 .metadata_update_cancel = metadata_update_cancel,
1572 .area_resyncing = area_resyncing,
1573 .add_new_disk = add_new_disk,
1574 .add_new_disk_cancel = add_new_disk_cancel,
1575 .new_disk_ack = new_disk_ack,
1576 .remove_disk = remove_disk,
1577 .load_bitmaps = load_bitmaps,
1578 .gather_bitmaps = gather_bitmaps,
1579 .resize_bitmaps = resize_bitmaps,
1580 .lock_all_bitmaps = lock_all_bitmaps,
1581 .unlock_all_bitmaps = unlock_all_bitmaps,
1582 .update_size = update_size,
1583};
1584
1585static int __init cluster_init(void)
1586{
1587 pr_warn("md-cluster: support raid1 and raid10 (limited support)\n");
1588 pr_info("Registering Cluster MD functions\n");
1589 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
1590 return 0;
1591}
1592
1593static void cluster_exit(void)
1594{
1595 unregister_md_cluster_operations();
1596}
1597
1598module_init(cluster_init);
1599module_exit(cluster_exit);
1600MODULE_AUTHOR("SUSE");
1601MODULE_LICENSE("GPL");
1602MODULE_DESCRIPTION("Clustering support for MD");