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