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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");
1/*
2 * Copyright (C) 2015, SUSE
3 *
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2, or (at your option)
7 * any later version.
8 *
9 */
10
11
12#include <linux/module.h>
13#include <linux/kthread.h>
14#include <linux/dlm.h>
15#include <linux/sched.h>
16#include <linux/raid/md_p.h>
17#include "md.h"
18#include "bitmap.h"
19#include "md-cluster.h"
20
21#define LVB_SIZE 64
22#define NEW_DEV_TIMEOUT 5000
23
24struct dlm_lock_resource {
25 dlm_lockspace_t *ls;
26 struct dlm_lksb lksb;
27 char *name; /* lock name. */
28 uint32_t flags; /* flags to pass to dlm_lock() */
29 wait_queue_head_t sync_locking; /* wait queue for synchronized locking */
30 bool sync_locking_done;
31 void (*bast)(void *arg, int mode); /* blocking AST function pointer*/
32 struct mddev *mddev; /* pointing back to mddev. */
33 int mode;
34};
35
36struct suspend_info {
37 int slot;
38 sector_t lo;
39 sector_t hi;
40 struct list_head list;
41};
42
43struct resync_info {
44 __le64 lo;
45 __le64 hi;
46};
47
48/* md_cluster_info flags */
49#define MD_CLUSTER_WAITING_FOR_NEWDISK 1
50#define MD_CLUSTER_SUSPEND_READ_BALANCING 2
51#define MD_CLUSTER_BEGIN_JOIN_CLUSTER 3
52
53/* Lock the send communication. This is done through
54 * bit manipulation as opposed to a mutex in order to
55 * accomodate lock and hold. See next comment.
56 */
57#define MD_CLUSTER_SEND_LOCK 4
58/* If cluster operations (such as adding a disk) must lock the
59 * communication channel, so as to perform extra operations
60 * (update metadata) and no other operation is allowed on the
61 * MD. Token needs to be locked and held until the operation
62 * completes witha md_update_sb(), which would eventually release
63 * the lock.
64 */
65#define MD_CLUSTER_SEND_LOCKED_ALREADY 5
66/* We should receive message after node joined cluster and
67 * set up all the related infos such as bitmap and personality */
68#define MD_CLUSTER_ALREADY_IN_CLUSTER 6
69#define MD_CLUSTER_PENDING_RECV_EVENT 7
70
71
72struct md_cluster_info {
73 /* dlm lock space and resources for clustered raid. */
74 dlm_lockspace_t *lockspace;
75 int slot_number;
76 struct completion completion;
77 struct mutex recv_mutex;
78 struct dlm_lock_resource *bitmap_lockres;
79 struct dlm_lock_resource **other_bitmap_lockres;
80 struct dlm_lock_resource *resync_lockres;
81 struct list_head suspend_list;
82 spinlock_t suspend_lock;
83 struct md_thread *recovery_thread;
84 unsigned long recovery_map;
85 /* communication loc resources */
86 struct dlm_lock_resource *ack_lockres;
87 struct dlm_lock_resource *message_lockres;
88 struct dlm_lock_resource *token_lockres;
89 struct dlm_lock_resource *no_new_dev_lockres;
90 struct md_thread *recv_thread;
91 struct completion newdisk_completion;
92 wait_queue_head_t wait;
93 unsigned long state;
94 /* record the region in RESYNCING message */
95 sector_t sync_low;
96 sector_t sync_hi;
97};
98
99enum msg_type {
100 METADATA_UPDATED = 0,
101 RESYNCING,
102 NEWDISK,
103 REMOVE,
104 RE_ADD,
105 BITMAP_NEEDS_SYNC,
106};
107
108struct cluster_msg {
109 __le32 type;
110 __le32 slot;
111 /* TODO: Unionize this for smaller footprint */
112 __le64 low;
113 __le64 high;
114 char uuid[16];
115 __le32 raid_slot;
116};
117
118static void sync_ast(void *arg)
119{
120 struct dlm_lock_resource *res;
121
122 res = arg;
123 res->sync_locking_done = true;
124 wake_up(&res->sync_locking);
125}
126
127static int dlm_lock_sync(struct dlm_lock_resource *res, int mode)
128{
129 int ret = 0;
130
131 ret = dlm_lock(res->ls, mode, &res->lksb,
132 res->flags, res->name, strlen(res->name),
133 0, sync_ast, res, res->bast);
134 if (ret)
135 return ret;
136 wait_event(res->sync_locking, res->sync_locking_done);
137 res->sync_locking_done = false;
138 if (res->lksb.sb_status == 0)
139 res->mode = mode;
140 return res->lksb.sb_status;
141}
142
143static int dlm_unlock_sync(struct dlm_lock_resource *res)
144{
145 return dlm_lock_sync(res, DLM_LOCK_NL);
146}
147
148/*
149 * An variation of dlm_lock_sync, which make lock request could
150 * be interrupted
151 */
152static int dlm_lock_sync_interruptible(struct dlm_lock_resource *res, int mode,
153 struct mddev *mddev)
154{
155 int ret = 0;
156
157 ret = dlm_lock(res->ls, mode, &res->lksb,
158 res->flags, res->name, strlen(res->name),
159 0, sync_ast, res, res->bast);
160 if (ret)
161 return ret;
162
163 wait_event(res->sync_locking, res->sync_locking_done
164 || kthread_should_stop()
165 || test_bit(MD_CLOSING, &mddev->flags));
166 if (!res->sync_locking_done) {
167 /*
168 * the convert queue contains the lock request when request is
169 * interrupted, and sync_ast could still be run, so need to
170 * cancel the request and reset completion
171 */
172 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_CANCEL,
173 &res->lksb, res);
174 res->sync_locking_done = false;
175 if (unlikely(ret != 0))
176 pr_info("failed to cancel previous lock request "
177 "%s return %d\n", res->name, ret);
178 return -EPERM;
179 } else
180 res->sync_locking_done = false;
181 if (res->lksb.sb_status == 0)
182 res->mode = mode;
183 return res->lksb.sb_status;
184}
185
186static struct dlm_lock_resource *lockres_init(struct mddev *mddev,
187 char *name, void (*bastfn)(void *arg, int mode), int with_lvb)
188{
189 struct dlm_lock_resource *res = NULL;
190 int ret, namelen;
191 struct md_cluster_info *cinfo = mddev->cluster_info;
192
193 res = kzalloc(sizeof(struct dlm_lock_resource), GFP_KERNEL);
194 if (!res)
195 return NULL;
196 init_waitqueue_head(&res->sync_locking);
197 res->sync_locking_done = false;
198 res->ls = cinfo->lockspace;
199 res->mddev = mddev;
200 res->mode = DLM_LOCK_IV;
201 namelen = strlen(name);
202 res->name = kzalloc(namelen + 1, GFP_KERNEL);
203 if (!res->name) {
204 pr_err("md-cluster: Unable to allocate resource name for resource %s\n", name);
205 goto out_err;
206 }
207 strlcpy(res->name, name, namelen + 1);
208 if (with_lvb) {
209 res->lksb.sb_lvbptr = kzalloc(LVB_SIZE, GFP_KERNEL);
210 if (!res->lksb.sb_lvbptr) {
211 pr_err("md-cluster: Unable to allocate LVB for resource %s\n", name);
212 goto out_err;
213 }
214 res->flags = DLM_LKF_VALBLK;
215 }
216
217 if (bastfn)
218 res->bast = bastfn;
219
220 res->flags |= DLM_LKF_EXPEDITE;
221
222 ret = dlm_lock_sync(res, DLM_LOCK_NL);
223 if (ret) {
224 pr_err("md-cluster: Unable to lock NL on new lock resource %s\n", name);
225 goto out_err;
226 }
227 res->flags &= ~DLM_LKF_EXPEDITE;
228 res->flags |= DLM_LKF_CONVERT;
229
230 return res;
231out_err:
232 kfree(res->lksb.sb_lvbptr);
233 kfree(res->name);
234 kfree(res);
235 return NULL;
236}
237
238static void lockres_free(struct dlm_lock_resource *res)
239{
240 int ret = 0;
241
242 if (!res)
243 return;
244
245 /*
246 * use FORCEUNLOCK flag, so we can unlock even the lock is on the
247 * waiting or convert queue
248 */
249 ret = dlm_unlock(res->ls, res->lksb.sb_lkid, DLM_LKF_FORCEUNLOCK,
250 &res->lksb, res);
251 if (unlikely(ret != 0))
252 pr_err("failed to unlock %s return %d\n", res->name, ret);
253 else
254 wait_event(res->sync_locking, res->sync_locking_done);
255
256 kfree(res->name);
257 kfree(res->lksb.sb_lvbptr);
258 kfree(res);
259}
260
261static void add_resync_info(struct dlm_lock_resource *lockres,
262 sector_t lo, sector_t hi)
263{
264 struct resync_info *ri;
265
266 ri = (struct resync_info *)lockres->lksb.sb_lvbptr;
267 ri->lo = cpu_to_le64(lo);
268 ri->hi = cpu_to_le64(hi);
269}
270
271static struct suspend_info *read_resync_info(struct mddev *mddev, struct dlm_lock_resource *lockres)
272{
273 struct resync_info ri;
274 struct suspend_info *s = NULL;
275 sector_t hi = 0;
276
277 dlm_lock_sync(lockres, DLM_LOCK_CR);
278 memcpy(&ri, lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
279 hi = le64_to_cpu(ri.hi);
280 if (hi > 0) {
281 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
282 if (!s)
283 goto out;
284 s->hi = hi;
285 s->lo = le64_to_cpu(ri.lo);
286 }
287 dlm_unlock_sync(lockres);
288out:
289 return s;
290}
291
292static void recover_bitmaps(struct md_thread *thread)
293{
294 struct mddev *mddev = thread->mddev;
295 struct md_cluster_info *cinfo = mddev->cluster_info;
296 struct dlm_lock_resource *bm_lockres;
297 char str[64];
298 int slot, ret;
299 struct suspend_info *s, *tmp;
300 sector_t lo, hi;
301
302 while (cinfo->recovery_map) {
303 slot = fls64((u64)cinfo->recovery_map) - 1;
304
305 /* Clear suspend_area associated with the bitmap */
306 spin_lock_irq(&cinfo->suspend_lock);
307 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
308 if (slot == s->slot) {
309 list_del(&s->list);
310 kfree(s);
311 }
312 spin_unlock_irq(&cinfo->suspend_lock);
313
314 snprintf(str, 64, "bitmap%04d", slot);
315 bm_lockres = lockres_init(mddev, str, NULL, 1);
316 if (!bm_lockres) {
317 pr_err("md-cluster: Cannot initialize bitmaps\n");
318 goto clear_bit;
319 }
320
321 ret = dlm_lock_sync_interruptible(bm_lockres, DLM_LOCK_PW, mddev);
322 if (ret) {
323 pr_err("md-cluster: Could not DLM lock %s: %d\n",
324 str, ret);
325 goto clear_bit;
326 }
327 ret = bitmap_copy_from_slot(mddev, slot, &lo, &hi, true);
328 if (ret) {
329 pr_err("md-cluster: Could not copy data from bitmap %d\n", slot);
330 goto clear_bit;
331 }
332 if (hi > 0) {
333 if (lo < mddev->recovery_cp)
334 mddev->recovery_cp = lo;
335 /* wake up thread to continue resync in case resync
336 * is not finished */
337 if (mddev->recovery_cp != MaxSector) {
338 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
339 md_wakeup_thread(mddev->thread);
340 }
341 }
342clear_bit:
343 lockres_free(bm_lockres);
344 clear_bit(slot, &cinfo->recovery_map);
345 }
346}
347
348static void recover_prep(void *arg)
349{
350 struct mddev *mddev = arg;
351 struct md_cluster_info *cinfo = mddev->cluster_info;
352 set_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
353}
354
355static void __recover_slot(struct mddev *mddev, int slot)
356{
357 struct md_cluster_info *cinfo = mddev->cluster_info;
358
359 set_bit(slot, &cinfo->recovery_map);
360 if (!cinfo->recovery_thread) {
361 cinfo->recovery_thread = md_register_thread(recover_bitmaps,
362 mddev, "recover");
363 if (!cinfo->recovery_thread) {
364 pr_warn("md-cluster: Could not create recovery thread\n");
365 return;
366 }
367 }
368 md_wakeup_thread(cinfo->recovery_thread);
369}
370
371static void recover_slot(void *arg, struct dlm_slot *slot)
372{
373 struct mddev *mddev = arg;
374 struct md_cluster_info *cinfo = mddev->cluster_info;
375
376 pr_info("md-cluster: %s Node %d/%d down. My slot: %d. Initiating recovery.\n",
377 mddev->bitmap_info.cluster_name,
378 slot->nodeid, slot->slot,
379 cinfo->slot_number);
380 /* deduct one since dlm slot starts from one while the num of
381 * cluster-md begins with 0 */
382 __recover_slot(mddev, slot->slot - 1);
383}
384
385static void recover_done(void *arg, struct dlm_slot *slots,
386 int num_slots, int our_slot,
387 uint32_t generation)
388{
389 struct mddev *mddev = arg;
390 struct md_cluster_info *cinfo = mddev->cluster_info;
391
392 cinfo->slot_number = our_slot;
393 /* completion is only need to be complete when node join cluster,
394 * it doesn't need to run during another node's failure */
395 if (test_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state)) {
396 complete(&cinfo->completion);
397 clear_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
398 }
399 clear_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state);
400}
401
402/* the ops is called when node join the cluster, and do lock recovery
403 * if node failure occurs */
404static const struct dlm_lockspace_ops md_ls_ops = {
405 .recover_prep = recover_prep,
406 .recover_slot = recover_slot,
407 .recover_done = recover_done,
408};
409
410/*
411 * The BAST function for the ack lock resource
412 * This function wakes up the receive thread in
413 * order to receive and process the message.
414 */
415static void ack_bast(void *arg, int mode)
416{
417 struct dlm_lock_resource *res = arg;
418 struct md_cluster_info *cinfo = res->mddev->cluster_info;
419
420 if (mode == DLM_LOCK_EX) {
421 if (test_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state))
422 md_wakeup_thread(cinfo->recv_thread);
423 else
424 set_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state);
425 }
426}
427
428static void __remove_suspend_info(struct md_cluster_info *cinfo, int slot)
429{
430 struct suspend_info *s, *tmp;
431
432 list_for_each_entry_safe(s, tmp, &cinfo->suspend_list, list)
433 if (slot == s->slot) {
434 list_del(&s->list);
435 kfree(s);
436 break;
437 }
438}
439
440static void remove_suspend_info(struct mddev *mddev, int slot)
441{
442 struct md_cluster_info *cinfo = mddev->cluster_info;
443 spin_lock_irq(&cinfo->suspend_lock);
444 __remove_suspend_info(cinfo, slot);
445 spin_unlock_irq(&cinfo->suspend_lock);
446 mddev->pers->quiesce(mddev, 2);
447}
448
449
450static void process_suspend_info(struct mddev *mddev,
451 int slot, sector_t lo, sector_t hi)
452{
453 struct md_cluster_info *cinfo = mddev->cluster_info;
454 struct suspend_info *s;
455
456 if (!hi) {
457 remove_suspend_info(mddev, slot);
458 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
459 md_wakeup_thread(mddev->thread);
460 return;
461 }
462
463 /*
464 * The bitmaps are not same for different nodes
465 * if RESYNCING is happening in one node, then
466 * the node which received the RESYNCING message
467 * probably will perform resync with the region
468 * [lo, hi] again, so we could reduce resync time
469 * a lot if we can ensure that the bitmaps among
470 * different nodes are match up well.
471 *
472 * sync_low/hi is used to record the region which
473 * arrived in the previous RESYNCING message,
474 *
475 * Call bitmap_sync_with_cluster to clear
476 * NEEDED_MASK and set RESYNC_MASK since
477 * resync thread is running in another node,
478 * so we don't need to do the resync again
479 * with the same section */
480 bitmap_sync_with_cluster(mddev, cinfo->sync_low,
481 cinfo->sync_hi,
482 lo, hi);
483 cinfo->sync_low = lo;
484 cinfo->sync_hi = hi;
485
486 s = kzalloc(sizeof(struct suspend_info), GFP_KERNEL);
487 if (!s)
488 return;
489 s->slot = slot;
490 s->lo = lo;
491 s->hi = hi;
492 mddev->pers->quiesce(mddev, 1);
493 mddev->pers->quiesce(mddev, 0);
494 spin_lock_irq(&cinfo->suspend_lock);
495 /* Remove existing entry (if exists) before adding */
496 __remove_suspend_info(cinfo, slot);
497 list_add(&s->list, &cinfo->suspend_list);
498 spin_unlock_irq(&cinfo->suspend_lock);
499 mddev->pers->quiesce(mddev, 2);
500}
501
502static void process_add_new_disk(struct mddev *mddev, struct cluster_msg *cmsg)
503{
504 char disk_uuid[64];
505 struct md_cluster_info *cinfo = mddev->cluster_info;
506 char event_name[] = "EVENT=ADD_DEVICE";
507 char raid_slot[16];
508 char *envp[] = {event_name, disk_uuid, raid_slot, NULL};
509 int len;
510
511 len = snprintf(disk_uuid, 64, "DEVICE_UUID=");
512 sprintf(disk_uuid + len, "%pU", cmsg->uuid);
513 snprintf(raid_slot, 16, "RAID_DISK=%d", le32_to_cpu(cmsg->raid_slot));
514 pr_info("%s:%d Sending kobject change with %s and %s\n", __func__, __LINE__, disk_uuid, raid_slot);
515 init_completion(&cinfo->newdisk_completion);
516 set_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
517 kobject_uevent_env(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE, envp);
518 wait_for_completion_timeout(&cinfo->newdisk_completion,
519 NEW_DEV_TIMEOUT);
520 clear_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state);
521}
522
523
524static void process_metadata_update(struct mddev *mddev, struct cluster_msg *msg)
525{
526 struct md_cluster_info *cinfo = mddev->cluster_info;
527 mddev->good_device_nr = le32_to_cpu(msg->raid_slot);
528 set_bit(MD_RELOAD_SB, &mddev->flags);
529 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
530 md_wakeup_thread(mddev->thread);
531}
532
533static void process_remove_disk(struct mddev *mddev, struct cluster_msg *msg)
534{
535 struct md_rdev *rdev;
536
537 rcu_read_lock();
538 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
539 if (rdev) {
540 set_bit(ClusterRemove, &rdev->flags);
541 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
542 md_wakeup_thread(mddev->thread);
543 }
544 else
545 pr_warn("%s: %d Could not find disk(%d) to REMOVE\n",
546 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
547 rcu_read_unlock();
548}
549
550static void process_readd_disk(struct mddev *mddev, struct cluster_msg *msg)
551{
552 struct md_rdev *rdev;
553
554 rcu_read_lock();
555 rdev = md_find_rdev_nr_rcu(mddev, le32_to_cpu(msg->raid_slot));
556 if (rdev && test_bit(Faulty, &rdev->flags))
557 clear_bit(Faulty, &rdev->flags);
558 else
559 pr_warn("%s: %d Could not find disk(%d) which is faulty",
560 __func__, __LINE__, le32_to_cpu(msg->raid_slot));
561 rcu_read_unlock();
562}
563
564static int process_recvd_msg(struct mddev *mddev, struct cluster_msg *msg)
565{
566 int ret = 0;
567
568 if (WARN(mddev->cluster_info->slot_number - 1 == le32_to_cpu(msg->slot),
569 "node %d received it's own msg\n", le32_to_cpu(msg->slot)))
570 return -1;
571 switch (le32_to_cpu(msg->type)) {
572 case METADATA_UPDATED:
573 process_metadata_update(mddev, msg);
574 break;
575 case RESYNCING:
576 process_suspend_info(mddev, le32_to_cpu(msg->slot),
577 le64_to_cpu(msg->low),
578 le64_to_cpu(msg->high));
579 break;
580 case NEWDISK:
581 process_add_new_disk(mddev, msg);
582 break;
583 case REMOVE:
584 process_remove_disk(mddev, msg);
585 break;
586 case RE_ADD:
587 process_readd_disk(mddev, msg);
588 break;
589 case BITMAP_NEEDS_SYNC:
590 __recover_slot(mddev, le32_to_cpu(msg->slot));
591 break;
592 default:
593 ret = -1;
594 pr_warn("%s:%d Received unknown message from %d\n",
595 __func__, __LINE__, msg->slot);
596 }
597 return ret;
598}
599
600/*
601 * thread for receiving message
602 */
603static void recv_daemon(struct md_thread *thread)
604{
605 struct md_cluster_info *cinfo = thread->mddev->cluster_info;
606 struct dlm_lock_resource *ack_lockres = cinfo->ack_lockres;
607 struct dlm_lock_resource *message_lockres = cinfo->message_lockres;
608 struct cluster_msg msg;
609 int ret;
610
611 mutex_lock(&cinfo->recv_mutex);
612 /*get CR on Message*/
613 if (dlm_lock_sync(message_lockres, DLM_LOCK_CR)) {
614 pr_err("md/raid1:failed to get CR on MESSAGE\n");
615 mutex_unlock(&cinfo->recv_mutex);
616 return;
617 }
618
619 /* read lvb and wake up thread to process this message_lockres */
620 memcpy(&msg, message_lockres->lksb.sb_lvbptr, sizeof(struct cluster_msg));
621 ret = process_recvd_msg(thread->mddev, &msg);
622 if (ret)
623 goto out;
624
625 /*release CR on ack_lockres*/
626 ret = dlm_unlock_sync(ack_lockres);
627 if (unlikely(ret != 0))
628 pr_info("unlock ack failed return %d\n", ret);
629 /*up-convert to PR on message_lockres*/
630 ret = dlm_lock_sync(message_lockres, DLM_LOCK_PR);
631 if (unlikely(ret != 0))
632 pr_info("lock PR on msg failed return %d\n", ret);
633 /*get CR on ack_lockres again*/
634 ret = dlm_lock_sync(ack_lockres, DLM_LOCK_CR);
635 if (unlikely(ret != 0))
636 pr_info("lock CR on ack failed return %d\n", ret);
637out:
638 /*release CR on message_lockres*/
639 ret = dlm_unlock_sync(message_lockres);
640 if (unlikely(ret != 0))
641 pr_info("unlock msg failed return %d\n", ret);
642 mutex_unlock(&cinfo->recv_mutex);
643}
644
645/* lock_token()
646 * Takes the lock on the TOKEN lock resource so no other
647 * node can communicate while the operation is underway.
648 */
649static int lock_token(struct md_cluster_info *cinfo)
650{
651 int error;
652
653 error = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
654 if (error)
655 pr_err("md-cluster(%s:%d): failed to get EX on TOKEN (%d)\n",
656 __func__, __LINE__, error);
657
658 /* Lock the receive sequence */
659 mutex_lock(&cinfo->recv_mutex);
660 return error;
661}
662
663/* lock_comm()
664 * Sets the MD_CLUSTER_SEND_LOCK bit to lock the send channel.
665 */
666static int lock_comm(struct md_cluster_info *cinfo)
667{
668 wait_event(cinfo->wait,
669 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state));
670
671 return lock_token(cinfo);
672}
673
674static void unlock_comm(struct md_cluster_info *cinfo)
675{
676 WARN_ON(cinfo->token_lockres->mode != DLM_LOCK_EX);
677 mutex_unlock(&cinfo->recv_mutex);
678 dlm_unlock_sync(cinfo->token_lockres);
679 clear_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state);
680 wake_up(&cinfo->wait);
681}
682
683/* __sendmsg()
684 * This function performs the actual sending of the message. This function is
685 * usually called after performing the encompassing operation
686 * The function:
687 * 1. Grabs the message lockresource in EX mode
688 * 2. Copies the message to the message LVB
689 * 3. Downconverts message lockresource to CW
690 * 4. Upconverts ack lock resource from CR to EX. This forces the BAST on other nodes
691 * and the other nodes read the message. The thread will wait here until all other
692 * nodes have released ack lock resource.
693 * 5. Downconvert ack lockresource to CR
694 */
695static int __sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
696{
697 int error;
698 int slot = cinfo->slot_number - 1;
699
700 cmsg->slot = cpu_to_le32(slot);
701 /*get EX on Message*/
702 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_EX);
703 if (error) {
704 pr_err("md-cluster: failed to get EX on MESSAGE (%d)\n", error);
705 goto failed_message;
706 }
707
708 memcpy(cinfo->message_lockres->lksb.sb_lvbptr, (void *)cmsg,
709 sizeof(struct cluster_msg));
710 /*down-convert EX to CW on Message*/
711 error = dlm_lock_sync(cinfo->message_lockres, DLM_LOCK_CW);
712 if (error) {
713 pr_err("md-cluster: failed to convert EX to CW on MESSAGE(%d)\n",
714 error);
715 goto failed_ack;
716 }
717
718 /*up-convert CR to EX on Ack*/
719 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_EX);
720 if (error) {
721 pr_err("md-cluster: failed to convert CR to EX on ACK(%d)\n",
722 error);
723 goto failed_ack;
724 }
725
726 /*down-convert EX to CR on Ack*/
727 error = dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR);
728 if (error) {
729 pr_err("md-cluster: failed to convert EX to CR on ACK(%d)\n",
730 error);
731 goto failed_ack;
732 }
733
734failed_ack:
735 error = dlm_unlock_sync(cinfo->message_lockres);
736 if (unlikely(error != 0)) {
737 pr_err("md-cluster: failed convert to NL on MESSAGE(%d)\n",
738 error);
739 /* in case the message can't be released due to some reason */
740 goto failed_ack;
741 }
742failed_message:
743 return error;
744}
745
746static int sendmsg(struct md_cluster_info *cinfo, struct cluster_msg *cmsg)
747{
748 int ret;
749
750 lock_comm(cinfo);
751 ret = __sendmsg(cinfo, cmsg);
752 unlock_comm(cinfo);
753 return ret;
754}
755
756static int gather_all_resync_info(struct mddev *mddev, int total_slots)
757{
758 struct md_cluster_info *cinfo = mddev->cluster_info;
759 int i, ret = 0;
760 struct dlm_lock_resource *bm_lockres;
761 struct suspend_info *s;
762 char str[64];
763 sector_t lo, hi;
764
765
766 for (i = 0; i < total_slots; i++) {
767 memset(str, '\0', 64);
768 snprintf(str, 64, "bitmap%04d", i);
769 bm_lockres = lockres_init(mddev, str, NULL, 1);
770 if (!bm_lockres)
771 return -ENOMEM;
772 if (i == (cinfo->slot_number - 1)) {
773 lockres_free(bm_lockres);
774 continue;
775 }
776
777 bm_lockres->flags |= DLM_LKF_NOQUEUE;
778 ret = dlm_lock_sync(bm_lockres, DLM_LOCK_PW);
779 if (ret == -EAGAIN) {
780 memset(bm_lockres->lksb.sb_lvbptr, '\0', LVB_SIZE);
781 s = read_resync_info(mddev, bm_lockres);
782 if (s) {
783 pr_info("%s:%d Resync[%llu..%llu] in progress on %d\n",
784 __func__, __LINE__,
785 (unsigned long long) s->lo,
786 (unsigned long long) s->hi, i);
787 spin_lock_irq(&cinfo->suspend_lock);
788 s->slot = i;
789 list_add(&s->list, &cinfo->suspend_list);
790 spin_unlock_irq(&cinfo->suspend_lock);
791 }
792 ret = 0;
793 lockres_free(bm_lockres);
794 continue;
795 }
796 if (ret) {
797 lockres_free(bm_lockres);
798 goto out;
799 }
800
801 /* Read the disk bitmap sb and check if it needs recovery */
802 ret = bitmap_copy_from_slot(mddev, i, &lo, &hi, false);
803 if (ret) {
804 pr_warn("md-cluster: Could not gather bitmaps from slot %d", i);
805 lockres_free(bm_lockres);
806 continue;
807 }
808 if ((hi > 0) && (lo < mddev->recovery_cp)) {
809 set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
810 mddev->recovery_cp = lo;
811 md_check_recovery(mddev);
812 }
813
814 lockres_free(bm_lockres);
815 }
816out:
817 return ret;
818}
819
820static int join(struct mddev *mddev, int nodes)
821{
822 struct md_cluster_info *cinfo;
823 int ret, ops_rv;
824 char str[64];
825
826 cinfo = kzalloc(sizeof(struct md_cluster_info), GFP_KERNEL);
827 if (!cinfo)
828 return -ENOMEM;
829
830 INIT_LIST_HEAD(&cinfo->suspend_list);
831 spin_lock_init(&cinfo->suspend_lock);
832 init_completion(&cinfo->completion);
833 set_bit(MD_CLUSTER_BEGIN_JOIN_CLUSTER, &cinfo->state);
834 init_waitqueue_head(&cinfo->wait);
835 mutex_init(&cinfo->recv_mutex);
836
837 mddev->cluster_info = cinfo;
838
839 memset(str, 0, 64);
840 sprintf(str, "%pU", mddev->uuid);
841 ret = dlm_new_lockspace(str, mddev->bitmap_info.cluster_name,
842 DLM_LSFL_FS, LVB_SIZE,
843 &md_ls_ops, mddev, &ops_rv, &cinfo->lockspace);
844 if (ret)
845 goto err;
846 wait_for_completion(&cinfo->completion);
847 if (nodes < cinfo->slot_number) {
848 pr_err("md-cluster: Slot allotted(%d) is greater than available slots(%d).",
849 cinfo->slot_number, nodes);
850 ret = -ERANGE;
851 goto err;
852 }
853 /* Initiate the communication resources */
854 ret = -ENOMEM;
855 cinfo->recv_thread = md_register_thread(recv_daemon, mddev, "cluster_recv");
856 if (!cinfo->recv_thread) {
857 pr_err("md-cluster: cannot allocate memory for recv_thread!\n");
858 goto err;
859 }
860 cinfo->message_lockres = lockres_init(mddev, "message", NULL, 1);
861 if (!cinfo->message_lockres)
862 goto err;
863 cinfo->token_lockres = lockres_init(mddev, "token", NULL, 0);
864 if (!cinfo->token_lockres)
865 goto err;
866 cinfo->no_new_dev_lockres = lockres_init(mddev, "no-new-dev", NULL, 0);
867 if (!cinfo->no_new_dev_lockres)
868 goto err;
869
870 ret = dlm_lock_sync(cinfo->token_lockres, DLM_LOCK_EX);
871 if (ret) {
872 ret = -EAGAIN;
873 pr_err("md-cluster: can't join cluster to avoid lock issue\n");
874 goto err;
875 }
876 cinfo->ack_lockres = lockres_init(mddev, "ack", ack_bast, 0);
877 if (!cinfo->ack_lockres) {
878 ret = -ENOMEM;
879 goto err;
880 }
881 /* get sync CR lock on ACK. */
882 if (dlm_lock_sync(cinfo->ack_lockres, DLM_LOCK_CR))
883 pr_err("md-cluster: failed to get a sync CR lock on ACK!(%d)\n",
884 ret);
885 dlm_unlock_sync(cinfo->token_lockres);
886 /* get sync CR lock on no-new-dev. */
887 if (dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR))
888 pr_err("md-cluster: failed to get a sync CR lock on no-new-dev!(%d)\n", ret);
889
890
891 pr_info("md-cluster: Joined cluster %s slot %d\n", str, cinfo->slot_number);
892 snprintf(str, 64, "bitmap%04d", cinfo->slot_number - 1);
893 cinfo->bitmap_lockres = lockres_init(mddev, str, NULL, 1);
894 if (!cinfo->bitmap_lockres) {
895 ret = -ENOMEM;
896 goto err;
897 }
898 if (dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW)) {
899 pr_err("Failed to get bitmap lock\n");
900 ret = -EINVAL;
901 goto err;
902 }
903
904 cinfo->resync_lockres = lockres_init(mddev, "resync", NULL, 0);
905 if (!cinfo->resync_lockres) {
906 ret = -ENOMEM;
907 goto err;
908 }
909
910 return 0;
911err:
912 md_unregister_thread(&cinfo->recovery_thread);
913 md_unregister_thread(&cinfo->recv_thread);
914 lockres_free(cinfo->message_lockres);
915 lockres_free(cinfo->token_lockres);
916 lockres_free(cinfo->ack_lockres);
917 lockres_free(cinfo->no_new_dev_lockres);
918 lockres_free(cinfo->resync_lockres);
919 lockres_free(cinfo->bitmap_lockres);
920 if (cinfo->lockspace)
921 dlm_release_lockspace(cinfo->lockspace, 2);
922 mddev->cluster_info = NULL;
923 kfree(cinfo);
924 return ret;
925}
926
927static void load_bitmaps(struct mddev *mddev, int total_slots)
928{
929 struct md_cluster_info *cinfo = mddev->cluster_info;
930
931 /* load all the node's bitmap info for resync */
932 if (gather_all_resync_info(mddev, total_slots))
933 pr_err("md-cluster: failed to gather all resyn infos\n");
934 set_bit(MD_CLUSTER_ALREADY_IN_CLUSTER, &cinfo->state);
935 /* wake up recv thread in case something need to be handled */
936 if (test_and_clear_bit(MD_CLUSTER_PENDING_RECV_EVENT, &cinfo->state))
937 md_wakeup_thread(cinfo->recv_thread);
938}
939
940static void resync_bitmap(struct mddev *mddev)
941{
942 struct md_cluster_info *cinfo = mddev->cluster_info;
943 struct cluster_msg cmsg = {0};
944 int err;
945
946 cmsg.type = cpu_to_le32(BITMAP_NEEDS_SYNC);
947 err = sendmsg(cinfo, &cmsg);
948 if (err)
949 pr_err("%s:%d: failed to send BITMAP_NEEDS_SYNC message (%d)\n",
950 __func__, __LINE__, err);
951}
952
953static void unlock_all_bitmaps(struct mddev *mddev);
954static int leave(struct mddev *mddev)
955{
956 struct md_cluster_info *cinfo = mddev->cluster_info;
957
958 if (!cinfo)
959 return 0;
960
961 /* BITMAP_NEEDS_SYNC message should be sent when node
962 * is leaving the cluster with dirty bitmap, also we
963 * can only deliver it when dlm connection is available */
964 if (cinfo->slot_number > 0 && mddev->recovery_cp != MaxSector)
965 resync_bitmap(mddev);
966
967 md_unregister_thread(&cinfo->recovery_thread);
968 md_unregister_thread(&cinfo->recv_thread);
969 lockres_free(cinfo->message_lockres);
970 lockres_free(cinfo->token_lockres);
971 lockres_free(cinfo->ack_lockres);
972 lockres_free(cinfo->no_new_dev_lockres);
973 lockres_free(cinfo->resync_lockres);
974 lockres_free(cinfo->bitmap_lockres);
975 unlock_all_bitmaps(mddev);
976 dlm_release_lockspace(cinfo->lockspace, 2);
977 return 0;
978}
979
980/* slot_number(): Returns the MD slot number to use
981 * DLM starts the slot numbers from 1, wheras cluster-md
982 * wants the number to be from zero, so we deduct one
983 */
984static int slot_number(struct mddev *mddev)
985{
986 struct md_cluster_info *cinfo = mddev->cluster_info;
987
988 return cinfo->slot_number - 1;
989}
990
991/*
992 * Check if the communication is already locked, else lock the communication
993 * channel.
994 * If it is already locked, token is in EX mode, and hence lock_token()
995 * should not be called.
996 */
997static int metadata_update_start(struct mddev *mddev)
998{
999 struct md_cluster_info *cinfo = mddev->cluster_info;
1000
1001 wait_event(cinfo->wait,
1002 !test_and_set_bit(MD_CLUSTER_SEND_LOCK, &cinfo->state) ||
1003 test_and_clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state));
1004
1005 /* If token is already locked, return 0 */
1006 if (cinfo->token_lockres->mode == DLM_LOCK_EX)
1007 return 0;
1008
1009 return lock_token(cinfo);
1010}
1011
1012static int metadata_update_finish(struct mddev *mddev)
1013{
1014 struct md_cluster_info *cinfo = mddev->cluster_info;
1015 struct cluster_msg cmsg;
1016 struct md_rdev *rdev;
1017 int ret = 0;
1018 int raid_slot = -1;
1019
1020 memset(&cmsg, 0, sizeof(cmsg));
1021 cmsg.type = cpu_to_le32(METADATA_UPDATED);
1022 /* Pick up a good active device number to send.
1023 */
1024 rdev_for_each(rdev, mddev)
1025 if (rdev->raid_disk > -1 && !test_bit(Faulty, &rdev->flags)) {
1026 raid_slot = rdev->desc_nr;
1027 break;
1028 }
1029 if (raid_slot >= 0) {
1030 cmsg.raid_slot = cpu_to_le32(raid_slot);
1031 ret = __sendmsg(cinfo, &cmsg);
1032 } else
1033 pr_warn("md-cluster: No good device id found to send\n");
1034 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1035 unlock_comm(cinfo);
1036 return ret;
1037}
1038
1039static void metadata_update_cancel(struct mddev *mddev)
1040{
1041 struct md_cluster_info *cinfo = mddev->cluster_info;
1042 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1043 unlock_comm(cinfo);
1044}
1045
1046static int resync_start(struct mddev *mddev)
1047{
1048 struct md_cluster_info *cinfo = mddev->cluster_info;
1049 return dlm_lock_sync_interruptible(cinfo->resync_lockres, DLM_LOCK_EX, mddev);
1050}
1051
1052static int resync_info_update(struct mddev *mddev, sector_t lo, sector_t hi)
1053{
1054 struct md_cluster_info *cinfo = mddev->cluster_info;
1055 struct resync_info ri;
1056 struct cluster_msg cmsg = {0};
1057
1058 /* do not send zero again, if we have sent before */
1059 if (hi == 0) {
1060 memcpy(&ri, cinfo->bitmap_lockres->lksb.sb_lvbptr, sizeof(struct resync_info));
1061 if (le64_to_cpu(ri.hi) == 0)
1062 return 0;
1063 }
1064
1065 add_resync_info(cinfo->bitmap_lockres, lo, hi);
1066 /* Re-acquire the lock to refresh LVB */
1067 dlm_lock_sync(cinfo->bitmap_lockres, DLM_LOCK_PW);
1068 cmsg.type = cpu_to_le32(RESYNCING);
1069 cmsg.low = cpu_to_le64(lo);
1070 cmsg.high = cpu_to_le64(hi);
1071
1072 return sendmsg(cinfo, &cmsg);
1073}
1074
1075static int resync_finish(struct mddev *mddev)
1076{
1077 struct md_cluster_info *cinfo = mddev->cluster_info;
1078 dlm_unlock_sync(cinfo->resync_lockres);
1079 return resync_info_update(mddev, 0, 0);
1080}
1081
1082static int area_resyncing(struct mddev *mddev, int direction,
1083 sector_t lo, sector_t hi)
1084{
1085 struct md_cluster_info *cinfo = mddev->cluster_info;
1086 int ret = 0;
1087 struct suspend_info *s;
1088
1089 if ((direction == READ) &&
1090 test_bit(MD_CLUSTER_SUSPEND_READ_BALANCING, &cinfo->state))
1091 return 1;
1092
1093 spin_lock_irq(&cinfo->suspend_lock);
1094 if (list_empty(&cinfo->suspend_list))
1095 goto out;
1096 list_for_each_entry(s, &cinfo->suspend_list, list)
1097 if (hi > s->lo && lo < s->hi) {
1098 ret = 1;
1099 break;
1100 }
1101out:
1102 spin_unlock_irq(&cinfo->suspend_lock);
1103 return ret;
1104}
1105
1106/* add_new_disk() - initiates a disk add
1107 * However, if this fails before writing md_update_sb(),
1108 * add_new_disk_cancel() must be called to release token lock
1109 */
1110static int add_new_disk(struct mddev *mddev, struct md_rdev *rdev)
1111{
1112 struct md_cluster_info *cinfo = mddev->cluster_info;
1113 struct cluster_msg cmsg;
1114 int ret = 0;
1115 struct mdp_superblock_1 *sb = page_address(rdev->sb_page);
1116 char *uuid = sb->device_uuid;
1117
1118 memset(&cmsg, 0, sizeof(cmsg));
1119 cmsg.type = cpu_to_le32(NEWDISK);
1120 memcpy(cmsg.uuid, uuid, 16);
1121 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1122 lock_comm(cinfo);
1123 ret = __sendmsg(cinfo, &cmsg);
1124 if (ret)
1125 return ret;
1126 cinfo->no_new_dev_lockres->flags |= DLM_LKF_NOQUEUE;
1127 ret = dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_EX);
1128 cinfo->no_new_dev_lockres->flags &= ~DLM_LKF_NOQUEUE;
1129 /* Some node does not "see" the device */
1130 if (ret == -EAGAIN)
1131 ret = -ENOENT;
1132 if (ret)
1133 unlock_comm(cinfo);
1134 else {
1135 dlm_lock_sync(cinfo->no_new_dev_lockres, DLM_LOCK_CR);
1136 /* Since MD_CHANGE_DEVS will be set in add_bound_rdev which
1137 * will run soon after add_new_disk, the below path will be
1138 * invoked:
1139 * md_wakeup_thread(mddev->thread)
1140 * -> conf->thread (raid1d)
1141 * -> md_check_recovery -> md_update_sb
1142 * -> metadata_update_start/finish
1143 * MD_CLUSTER_SEND_LOCKED_ALREADY will be cleared eventually.
1144 *
1145 * For other failure cases, metadata_update_cancel and
1146 * add_new_disk_cancel also clear below bit as well.
1147 * */
1148 set_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1149 wake_up(&cinfo->wait);
1150 }
1151 return ret;
1152}
1153
1154static void add_new_disk_cancel(struct mddev *mddev)
1155{
1156 struct md_cluster_info *cinfo = mddev->cluster_info;
1157 clear_bit(MD_CLUSTER_SEND_LOCKED_ALREADY, &cinfo->state);
1158 unlock_comm(cinfo);
1159}
1160
1161static int new_disk_ack(struct mddev *mddev, bool ack)
1162{
1163 struct md_cluster_info *cinfo = mddev->cluster_info;
1164
1165 if (!test_bit(MD_CLUSTER_WAITING_FOR_NEWDISK, &cinfo->state)) {
1166 pr_warn("md-cluster(%s): Spurious cluster confirmation\n", mdname(mddev));
1167 return -EINVAL;
1168 }
1169
1170 if (ack)
1171 dlm_unlock_sync(cinfo->no_new_dev_lockres);
1172 complete(&cinfo->newdisk_completion);
1173 return 0;
1174}
1175
1176static int remove_disk(struct mddev *mddev, struct md_rdev *rdev)
1177{
1178 struct cluster_msg cmsg = {0};
1179 struct md_cluster_info *cinfo = mddev->cluster_info;
1180 cmsg.type = cpu_to_le32(REMOVE);
1181 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1182 return sendmsg(cinfo, &cmsg);
1183}
1184
1185static int lock_all_bitmaps(struct mddev *mddev)
1186{
1187 int slot, my_slot, ret, held = 1, i = 0;
1188 char str[64];
1189 struct md_cluster_info *cinfo = mddev->cluster_info;
1190
1191 cinfo->other_bitmap_lockres = kzalloc((mddev->bitmap_info.nodes - 1) *
1192 sizeof(struct dlm_lock_resource *),
1193 GFP_KERNEL);
1194 if (!cinfo->other_bitmap_lockres) {
1195 pr_err("md: can't alloc mem for other bitmap locks\n");
1196 return 0;
1197 }
1198
1199 my_slot = slot_number(mddev);
1200 for (slot = 0; slot < mddev->bitmap_info.nodes; slot++) {
1201 if (slot == my_slot)
1202 continue;
1203
1204 memset(str, '\0', 64);
1205 snprintf(str, 64, "bitmap%04d", slot);
1206 cinfo->other_bitmap_lockres[i] = lockres_init(mddev, str, NULL, 1);
1207 if (!cinfo->other_bitmap_lockres[i])
1208 return -ENOMEM;
1209
1210 cinfo->other_bitmap_lockres[i]->flags |= DLM_LKF_NOQUEUE;
1211 ret = dlm_lock_sync(cinfo->other_bitmap_lockres[i], DLM_LOCK_PW);
1212 if (ret)
1213 held = -1;
1214 i++;
1215 }
1216
1217 return held;
1218}
1219
1220static void unlock_all_bitmaps(struct mddev *mddev)
1221{
1222 struct md_cluster_info *cinfo = mddev->cluster_info;
1223 int i;
1224
1225 /* release other node's bitmap lock if they are existed */
1226 if (cinfo->other_bitmap_lockres) {
1227 for (i = 0; i < mddev->bitmap_info.nodes - 1; i++) {
1228 if (cinfo->other_bitmap_lockres[i]) {
1229 lockres_free(cinfo->other_bitmap_lockres[i]);
1230 }
1231 }
1232 kfree(cinfo->other_bitmap_lockres);
1233 }
1234}
1235
1236static int gather_bitmaps(struct md_rdev *rdev)
1237{
1238 int sn, err;
1239 sector_t lo, hi;
1240 struct cluster_msg cmsg = {0};
1241 struct mddev *mddev = rdev->mddev;
1242 struct md_cluster_info *cinfo = mddev->cluster_info;
1243
1244 cmsg.type = cpu_to_le32(RE_ADD);
1245 cmsg.raid_slot = cpu_to_le32(rdev->desc_nr);
1246 err = sendmsg(cinfo, &cmsg);
1247 if (err)
1248 goto out;
1249
1250 for (sn = 0; sn < mddev->bitmap_info.nodes; sn++) {
1251 if (sn == (cinfo->slot_number - 1))
1252 continue;
1253 err = bitmap_copy_from_slot(mddev, sn, &lo, &hi, false);
1254 if (err) {
1255 pr_warn("md-cluster: Could not gather bitmaps from slot %d", sn);
1256 goto out;
1257 }
1258 if ((hi > 0) && (lo < mddev->recovery_cp))
1259 mddev->recovery_cp = lo;
1260 }
1261out:
1262 return err;
1263}
1264
1265static struct md_cluster_operations cluster_ops = {
1266 .join = join,
1267 .leave = leave,
1268 .slot_number = slot_number,
1269 .resync_start = resync_start,
1270 .resync_finish = resync_finish,
1271 .resync_info_update = resync_info_update,
1272 .metadata_update_start = metadata_update_start,
1273 .metadata_update_finish = metadata_update_finish,
1274 .metadata_update_cancel = metadata_update_cancel,
1275 .area_resyncing = area_resyncing,
1276 .add_new_disk = add_new_disk,
1277 .add_new_disk_cancel = add_new_disk_cancel,
1278 .new_disk_ack = new_disk_ack,
1279 .remove_disk = remove_disk,
1280 .load_bitmaps = load_bitmaps,
1281 .gather_bitmaps = gather_bitmaps,
1282 .lock_all_bitmaps = lock_all_bitmaps,
1283 .unlock_all_bitmaps = unlock_all_bitmaps,
1284};
1285
1286static int __init cluster_init(void)
1287{
1288 pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
1289 pr_info("Registering Cluster MD functions\n");
1290 register_md_cluster_operations(&cluster_ops, THIS_MODULE);
1291 return 0;
1292}
1293
1294static void cluster_exit(void)
1295{
1296 unregister_md_cluster_operations();
1297}
1298
1299module_init(cluster_init);
1300module_exit(cluster_exit);
1301MODULE_AUTHOR("SUSE");
1302MODULE_LICENSE("GPL");
1303MODULE_DESCRIPTION("Clustering support for MD");