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28#include <linux/module.h>
29#include <linux/fs.h>
30#include <linux/types.h>
31#include <linux/slab.h>
32#include <linux/highmem.h>
33#include <linux/init.h>
34#include <linux/sysctl.h>
35#include <linux/random.h>
36#include <linux/blkdev.h>
37#include <linux/socket.h>
38#include <linux/inet.h>
39#include <linux/spinlock.h>
40#include <linux/delay.h>
41
42
43#include "cluster/heartbeat.h"
44#include "cluster/nodemanager.h"
45#include "cluster/tcp.h"
46
47#include "dlmapi.h"
48#include "dlmcommon.h"
49#include "dlmdomain.h"
50#include "dlmdebug.h"
51
52#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_MASTER)
53#include "cluster/masklog.h"
54
55static void dlm_mle_node_down(struct dlm_ctxt *dlm,
56 struct dlm_master_list_entry *mle,
57 struct o2nm_node *node,
58 int idx);
59static void dlm_mle_node_up(struct dlm_ctxt *dlm,
60 struct dlm_master_list_entry *mle,
61 struct o2nm_node *node,
62 int idx);
63
64static void dlm_assert_master_worker(struct dlm_work_item *item, void *data);
65static int dlm_do_assert_master(struct dlm_ctxt *dlm,
66 struct dlm_lock_resource *res,
67 void *nodemap, u32 flags);
68static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data);
69
70static inline int dlm_mle_equal(struct dlm_ctxt *dlm,
71 struct dlm_master_list_entry *mle,
72 const char *name,
73 unsigned int namelen)
74{
75 if (dlm != mle->dlm)
76 return 0;
77
78 if (namelen != mle->mnamelen ||
79 memcmp(name, mle->mname, namelen) != 0)
80 return 0;
81
82 return 1;
83}
84
85static struct kmem_cache *dlm_lockres_cache = NULL;
86static struct kmem_cache *dlm_lockname_cache = NULL;
87static struct kmem_cache *dlm_mle_cache = NULL;
88
89static void dlm_mle_release(struct kref *kref);
90static void dlm_init_mle(struct dlm_master_list_entry *mle,
91 enum dlm_mle_type type,
92 struct dlm_ctxt *dlm,
93 struct dlm_lock_resource *res,
94 const char *name,
95 unsigned int namelen);
96static void dlm_put_mle(struct dlm_master_list_entry *mle);
97static void __dlm_put_mle(struct dlm_master_list_entry *mle);
98static int dlm_find_mle(struct dlm_ctxt *dlm,
99 struct dlm_master_list_entry **mle,
100 char *name, unsigned int namelen);
101
102static int dlm_do_master_request(struct dlm_lock_resource *res,
103 struct dlm_master_list_entry *mle, int to);
104
105
106static int dlm_wait_for_lock_mastery(struct dlm_ctxt *dlm,
107 struct dlm_lock_resource *res,
108 struct dlm_master_list_entry *mle,
109 int *blocked);
110static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
111 struct dlm_lock_resource *res,
112 struct dlm_master_list_entry *mle,
113 int blocked);
114static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
115 struct dlm_lock_resource *res,
116 struct dlm_master_list_entry *mle,
117 struct dlm_master_list_entry **oldmle,
118 const char *name, unsigned int namelen,
119 u8 new_master, u8 master);
120
121static u8 dlm_pick_migration_target(struct dlm_ctxt *dlm,
122 struct dlm_lock_resource *res);
123static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm,
124 struct dlm_lock_resource *res);
125static int dlm_mark_lockres_migrating(struct dlm_ctxt *dlm,
126 struct dlm_lock_resource *res,
127 u8 target);
128static int dlm_pre_master_reco_lockres(struct dlm_ctxt *dlm,
129 struct dlm_lock_resource *res);
130
131
132int dlm_is_host_down(int errno)
133{
134 switch (errno) {
135 case -EBADF:
136 case -ECONNREFUSED:
137 case -ENOTCONN:
138 case -ECONNRESET:
139 case -EPIPE:
140 case -EHOSTDOWN:
141 case -EHOSTUNREACH:
142 case -ETIMEDOUT:
143 case -ECONNABORTED:
144 case -ENETDOWN:
145 case -ENETUNREACH:
146 case -ENETRESET:
147 case -ESHUTDOWN:
148 case -ENOPROTOOPT:
149 case -EINVAL:
150
151 return 1;
152 }
153 return 0;
154}
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178static inline void __dlm_mle_attach_hb_events(struct dlm_ctxt *dlm,
179 struct dlm_master_list_entry *mle)
180{
181 assert_spin_locked(&dlm->spinlock);
182
183 list_add_tail(&mle->hb_events, &dlm->mle_hb_events);
184}
185
186
187static inline void __dlm_mle_detach_hb_events(struct dlm_ctxt *dlm,
188 struct dlm_master_list_entry *mle)
189{
190 if (!list_empty(&mle->hb_events))
191 list_del_init(&mle->hb_events);
192}
193
194
195static inline void dlm_mle_detach_hb_events(struct dlm_ctxt *dlm,
196 struct dlm_master_list_entry *mle)
197{
198 spin_lock(&dlm->spinlock);
199 __dlm_mle_detach_hb_events(dlm, mle);
200 spin_unlock(&dlm->spinlock);
201}
202
203static void dlm_get_mle_inuse(struct dlm_master_list_entry *mle)
204{
205 struct dlm_ctxt *dlm;
206 dlm = mle->dlm;
207
208 assert_spin_locked(&dlm->spinlock);
209 assert_spin_locked(&dlm->master_lock);
210 mle->inuse++;
211 kref_get(&mle->mle_refs);
212}
213
214static void dlm_put_mle_inuse(struct dlm_master_list_entry *mle)
215{
216 struct dlm_ctxt *dlm;
217 dlm = mle->dlm;
218
219 spin_lock(&dlm->spinlock);
220 spin_lock(&dlm->master_lock);
221 mle->inuse--;
222 __dlm_put_mle(mle);
223 spin_unlock(&dlm->master_lock);
224 spin_unlock(&dlm->spinlock);
225
226}
227
228
229static void __dlm_put_mle(struct dlm_master_list_entry *mle)
230{
231 struct dlm_ctxt *dlm;
232 dlm = mle->dlm;
233
234 assert_spin_locked(&dlm->spinlock);
235 assert_spin_locked(&dlm->master_lock);
236 if (!atomic_read(&mle->mle_refs.refcount)) {
237
238
239 mlog(ML_ERROR, "bad mle: %p\n", mle);
240 dlm_print_one_mle(mle);
241 BUG();
242 } else
243 kref_put(&mle->mle_refs, dlm_mle_release);
244}
245
246
247
248static void dlm_put_mle(struct dlm_master_list_entry *mle)
249{
250 struct dlm_ctxt *dlm;
251 dlm = mle->dlm;
252
253 spin_lock(&dlm->spinlock);
254 spin_lock(&dlm->master_lock);
255 __dlm_put_mle(mle);
256 spin_unlock(&dlm->master_lock);
257 spin_unlock(&dlm->spinlock);
258}
259
260static inline void dlm_get_mle(struct dlm_master_list_entry *mle)
261{
262 kref_get(&mle->mle_refs);
263}
264
265static void dlm_init_mle(struct dlm_master_list_entry *mle,
266 enum dlm_mle_type type,
267 struct dlm_ctxt *dlm,
268 struct dlm_lock_resource *res,
269 const char *name,
270 unsigned int namelen)
271{
272 assert_spin_locked(&dlm->spinlock);
273
274 mle->dlm = dlm;
275 mle->type = type;
276 INIT_HLIST_NODE(&mle->master_hash_node);
277 INIT_LIST_HEAD(&mle->hb_events);
278 memset(mle->maybe_map, 0, sizeof(mle->maybe_map));
279 spin_lock_init(&mle->spinlock);
280 init_waitqueue_head(&mle->wq);
281 atomic_set(&mle->woken, 0);
282 kref_init(&mle->mle_refs);
283 memset(mle->response_map, 0, sizeof(mle->response_map));
284 mle->master = O2NM_MAX_NODES;
285 mle->new_master = O2NM_MAX_NODES;
286 mle->inuse = 0;
287
288 BUG_ON(mle->type != DLM_MLE_BLOCK &&
289 mle->type != DLM_MLE_MASTER &&
290 mle->type != DLM_MLE_MIGRATION);
291
292 if (mle->type == DLM_MLE_MASTER) {
293 BUG_ON(!res);
294 mle->mleres = res;
295 memcpy(mle->mname, res->lockname.name, res->lockname.len);
296 mle->mnamelen = res->lockname.len;
297 mle->mnamehash = res->lockname.hash;
298 } else {
299 BUG_ON(!name);
300 mle->mleres = NULL;
301 memcpy(mle->mname, name, namelen);
302 mle->mnamelen = namelen;
303 mle->mnamehash = dlm_lockid_hash(name, namelen);
304 }
305
306 atomic_inc(&dlm->mle_tot_count[mle->type]);
307 atomic_inc(&dlm->mle_cur_count[mle->type]);
308
309
310 memcpy(mle->node_map, dlm->domain_map, sizeof(mle->node_map));
311 memcpy(mle->vote_map, dlm->domain_map, sizeof(mle->vote_map));
312 clear_bit(dlm->node_num, mle->vote_map);
313 clear_bit(dlm->node_num, mle->node_map);
314
315
316 __dlm_mle_attach_hb_events(dlm, mle);
317}
318
319void __dlm_unlink_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
320{
321 assert_spin_locked(&dlm->spinlock);
322 assert_spin_locked(&dlm->master_lock);
323
324 if (!hlist_unhashed(&mle->master_hash_node))
325 hlist_del_init(&mle->master_hash_node);
326}
327
328void __dlm_insert_mle(struct dlm_ctxt *dlm, struct dlm_master_list_entry *mle)
329{
330 struct hlist_head *bucket;
331
332 assert_spin_locked(&dlm->master_lock);
333
334 bucket = dlm_master_hash(dlm, mle->mnamehash);
335 hlist_add_head(&mle->master_hash_node, bucket);
336}
337
338
339static int dlm_find_mle(struct dlm_ctxt *dlm,
340 struct dlm_master_list_entry **mle,
341 char *name, unsigned int namelen)
342{
343 struct dlm_master_list_entry *tmpmle;
344 struct hlist_head *bucket;
345 unsigned int hash;
346
347 assert_spin_locked(&dlm->master_lock);
348
349 hash = dlm_lockid_hash(name, namelen);
350 bucket = dlm_master_hash(dlm, hash);
351 hlist_for_each_entry(tmpmle, bucket, master_hash_node) {
352 if (!dlm_mle_equal(dlm, tmpmle, name, namelen))
353 continue;
354 dlm_get_mle(tmpmle);
355 *mle = tmpmle;
356 return 1;
357 }
358 return 0;
359}
360
361void dlm_hb_event_notify_attached(struct dlm_ctxt *dlm, int idx, int node_up)
362{
363 struct dlm_master_list_entry *mle;
364
365 assert_spin_locked(&dlm->spinlock);
366
367 list_for_each_entry(mle, &dlm->mle_hb_events, hb_events) {
368 if (node_up)
369 dlm_mle_node_up(dlm, mle, NULL, idx);
370 else
371 dlm_mle_node_down(dlm, mle, NULL, idx);
372 }
373}
374
375static void dlm_mle_node_down(struct dlm_ctxt *dlm,
376 struct dlm_master_list_entry *mle,
377 struct o2nm_node *node, int idx)
378{
379 spin_lock(&mle->spinlock);
380
381 if (!test_bit(idx, mle->node_map))
382 mlog(0, "node %u already removed from nodemap!\n", idx);
383 else
384 clear_bit(idx, mle->node_map);
385
386 spin_unlock(&mle->spinlock);
387}
388
389static void dlm_mle_node_up(struct dlm_ctxt *dlm,
390 struct dlm_master_list_entry *mle,
391 struct o2nm_node *node, int idx)
392{
393 spin_lock(&mle->spinlock);
394
395 if (test_bit(idx, mle->node_map))
396 mlog(0, "node %u already in node map!\n", idx);
397 else
398 set_bit(idx, mle->node_map);
399
400 spin_unlock(&mle->spinlock);
401}
402
403
404int dlm_init_mle_cache(void)
405{
406 dlm_mle_cache = kmem_cache_create("o2dlm_mle",
407 sizeof(struct dlm_master_list_entry),
408 0, SLAB_HWCACHE_ALIGN,
409 NULL);
410 if (dlm_mle_cache == NULL)
411 return -ENOMEM;
412 return 0;
413}
414
415void dlm_destroy_mle_cache(void)
416{
417 if (dlm_mle_cache)
418 kmem_cache_destroy(dlm_mle_cache);
419}
420
421static void dlm_mle_release(struct kref *kref)
422{
423 struct dlm_master_list_entry *mle;
424 struct dlm_ctxt *dlm;
425
426 mle = container_of(kref, struct dlm_master_list_entry, mle_refs);
427 dlm = mle->dlm;
428
429 assert_spin_locked(&dlm->spinlock);
430 assert_spin_locked(&dlm->master_lock);
431
432 mlog(0, "Releasing mle for %.*s, type %d\n", mle->mnamelen, mle->mname,
433 mle->type);
434
435
436 __dlm_unlink_mle(dlm, mle);
437
438
439 __dlm_mle_detach_hb_events(dlm, mle);
440
441 atomic_dec(&dlm->mle_cur_count[mle->type]);
442
443
444
445 kmem_cache_free(dlm_mle_cache, mle);
446}
447
448
449
450
451
452
453int dlm_init_master_caches(void)
454{
455 dlm_lockres_cache = kmem_cache_create("o2dlm_lockres",
456 sizeof(struct dlm_lock_resource),
457 0, SLAB_HWCACHE_ALIGN, NULL);
458 if (!dlm_lockres_cache)
459 goto bail;
460
461 dlm_lockname_cache = kmem_cache_create("o2dlm_lockname",
462 DLM_LOCKID_NAME_MAX, 0,
463 SLAB_HWCACHE_ALIGN, NULL);
464 if (!dlm_lockname_cache)
465 goto bail;
466
467 return 0;
468bail:
469 dlm_destroy_master_caches();
470 return -ENOMEM;
471}
472
473void dlm_destroy_master_caches(void)
474{
475 if (dlm_lockname_cache)
476 kmem_cache_destroy(dlm_lockname_cache);
477
478 if (dlm_lockres_cache)
479 kmem_cache_destroy(dlm_lockres_cache);
480}
481
482static void dlm_lockres_release(struct kref *kref)
483{
484 struct dlm_lock_resource *res;
485 struct dlm_ctxt *dlm;
486
487 res = container_of(kref, struct dlm_lock_resource, refs);
488 dlm = res->dlm;
489
490
491
492 BUG_ON(!res->lockname.name);
493
494 mlog(0, "destroying lockres %.*s\n", res->lockname.len,
495 res->lockname.name);
496
497 spin_lock(&dlm->track_lock);
498 if (!list_empty(&res->tracking))
499 list_del_init(&res->tracking);
500 else {
501 mlog(ML_ERROR, "Resource %.*s not on the Tracking list\n",
502 res->lockname.len, res->lockname.name);
503 dlm_print_one_lock_resource(res);
504 }
505 spin_unlock(&dlm->track_lock);
506
507 atomic_dec(&dlm->res_cur_count);
508
509 if (!hlist_unhashed(&res->hash_node) ||
510 !list_empty(&res->granted) ||
511 !list_empty(&res->converting) ||
512 !list_empty(&res->blocked) ||
513 !list_empty(&res->dirty) ||
514 !list_empty(&res->recovering) ||
515 !list_empty(&res->purge)) {
516 mlog(ML_ERROR,
517 "Going to BUG for resource %.*s."
518 " We're on a list! [%c%c%c%c%c%c%c]\n",
519 res->lockname.len, res->lockname.name,
520 !hlist_unhashed(&res->hash_node) ? 'H' : ' ',
521 !list_empty(&res->granted) ? 'G' : ' ',
522 !list_empty(&res->converting) ? 'C' : ' ',
523 !list_empty(&res->blocked) ? 'B' : ' ',
524 !list_empty(&res->dirty) ? 'D' : ' ',
525 !list_empty(&res->recovering) ? 'R' : ' ',
526 !list_empty(&res->purge) ? 'P' : ' ');
527
528 dlm_print_one_lock_resource(res);
529 }
530
531
532
533 BUG_ON(!hlist_unhashed(&res->hash_node));
534 BUG_ON(!list_empty(&res->granted));
535 BUG_ON(!list_empty(&res->converting));
536 BUG_ON(!list_empty(&res->blocked));
537 BUG_ON(!list_empty(&res->dirty));
538 BUG_ON(!list_empty(&res->recovering));
539 BUG_ON(!list_empty(&res->purge));
540
541 kmem_cache_free(dlm_lockname_cache, (void *)res->lockname.name);
542
543 kmem_cache_free(dlm_lockres_cache, res);
544}
545
546void dlm_lockres_put(struct dlm_lock_resource *res)
547{
548 kref_put(&res->refs, dlm_lockres_release);
549}
550
551static void dlm_init_lockres(struct dlm_ctxt *dlm,
552 struct dlm_lock_resource *res,
553 const char *name, unsigned int namelen)
554{
555 char *qname;
556
557
558
559
560
561 qname = (char *) res->lockname.name;
562 memcpy(qname, name, namelen);
563
564 res->lockname.len = namelen;
565 res->lockname.hash = dlm_lockid_hash(name, namelen);
566
567 init_waitqueue_head(&res->wq);
568 spin_lock_init(&res->spinlock);
569 INIT_HLIST_NODE(&res->hash_node);
570 INIT_LIST_HEAD(&res->granted);
571 INIT_LIST_HEAD(&res->converting);
572 INIT_LIST_HEAD(&res->blocked);
573 INIT_LIST_HEAD(&res->dirty);
574 INIT_LIST_HEAD(&res->recovering);
575 INIT_LIST_HEAD(&res->purge);
576 INIT_LIST_HEAD(&res->tracking);
577 atomic_set(&res->asts_reserved, 0);
578 res->migration_pending = 0;
579 res->inflight_locks = 0;
580
581 res->dlm = dlm;
582
583 kref_init(&res->refs);
584
585 atomic_inc(&dlm->res_tot_count);
586 atomic_inc(&dlm->res_cur_count);
587
588
589 spin_lock(&res->spinlock);
590 dlm_set_lockres_owner(dlm, res, DLM_LOCK_RES_OWNER_UNKNOWN);
591 spin_unlock(&res->spinlock);
592
593 res->state = DLM_LOCK_RES_IN_PROGRESS;
594
595 res->last_used = 0;
596
597 spin_lock(&dlm->spinlock);
598 list_add_tail(&res->tracking, &dlm->tracking_list);
599 spin_unlock(&dlm->spinlock);
600
601 memset(res->lvb, 0, DLM_LVB_LEN);
602 memset(res->refmap, 0, sizeof(res->refmap));
603}
604
605struct dlm_lock_resource *dlm_new_lockres(struct dlm_ctxt *dlm,
606 const char *name,
607 unsigned int namelen)
608{
609 struct dlm_lock_resource *res = NULL;
610
611 res = kmem_cache_zalloc(dlm_lockres_cache, GFP_NOFS);
612 if (!res)
613 goto error;
614
615 res->lockname.name = kmem_cache_zalloc(dlm_lockname_cache, GFP_NOFS);
616 if (!res->lockname.name)
617 goto error;
618
619 dlm_init_lockres(dlm, res, name, namelen);
620 return res;
621
622error:
623 if (res && res->lockname.name)
624 kmem_cache_free(dlm_lockname_cache, (void *)res->lockname.name);
625
626 if (res)
627 kmem_cache_free(dlm_lockres_cache, res);
628 return NULL;
629}
630
631void dlm_lockres_set_refmap_bit(struct dlm_ctxt *dlm,
632 struct dlm_lock_resource *res, int bit)
633{
634 assert_spin_locked(&res->spinlock);
635
636 mlog(0, "res %.*s, set node %u, %ps()\n", res->lockname.len,
637 res->lockname.name, bit, __builtin_return_address(0));
638
639 set_bit(bit, res->refmap);
640}
641
642void dlm_lockres_clear_refmap_bit(struct dlm_ctxt *dlm,
643 struct dlm_lock_resource *res, int bit)
644{
645 assert_spin_locked(&res->spinlock);
646
647 mlog(0, "res %.*s, clr node %u, %ps()\n", res->lockname.len,
648 res->lockname.name, bit, __builtin_return_address(0));
649
650 clear_bit(bit, res->refmap);
651}
652
653
654void dlm_lockres_grab_inflight_ref(struct dlm_ctxt *dlm,
655 struct dlm_lock_resource *res)
656{
657 assert_spin_locked(&res->spinlock);
658
659 res->inflight_locks++;
660
661 mlog(0, "%s: res %.*s, inflight++: now %u, %ps()\n", dlm->name,
662 res->lockname.len, res->lockname.name, res->inflight_locks,
663 __builtin_return_address(0));
664}
665
666void dlm_lockres_drop_inflight_ref(struct dlm_ctxt *dlm,
667 struct dlm_lock_resource *res)
668{
669 assert_spin_locked(&res->spinlock);
670
671 BUG_ON(res->inflight_locks == 0);
672
673 res->inflight_locks--;
674
675 mlog(0, "%s: res %.*s, inflight--: now %u, %ps()\n", dlm->name,
676 res->lockname.len, res->lockname.name, res->inflight_locks,
677 __builtin_return_address(0));
678
679 wake_up(&res->wq);
680}
681
682
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695
696
697
698struct dlm_lock_resource * dlm_get_lock_resource(struct dlm_ctxt *dlm,
699 const char *lockid,
700 int namelen,
701 int flags)
702{
703 struct dlm_lock_resource *tmpres=NULL, *res=NULL;
704 struct dlm_master_list_entry *mle = NULL;
705 struct dlm_master_list_entry *alloc_mle = NULL;
706 int blocked = 0;
707 int ret, nodenum;
708 struct dlm_node_iter iter;
709 unsigned int hash;
710 int tries = 0;
711 int bit, wait_on_recovery = 0;
712
713 BUG_ON(!lockid);
714
715 hash = dlm_lockid_hash(lockid, namelen);
716
717 mlog(0, "get lockres %s (len %d)\n", lockid, namelen);
718
719lookup:
720 spin_lock(&dlm->spinlock);
721 tmpres = __dlm_lookup_lockres_full(dlm, lockid, namelen, hash);
722 if (tmpres) {
723 spin_unlock(&dlm->spinlock);
724 spin_lock(&tmpres->spinlock);
725
726 if (tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
727 __dlm_wait_on_lockres(tmpres);
728 BUG_ON(tmpres->owner == DLM_LOCK_RES_OWNER_UNKNOWN);
729 spin_unlock(&tmpres->spinlock);
730 dlm_lockres_put(tmpres);
731 tmpres = NULL;
732 goto lookup;
733 }
734
735
736 if (tmpres->state & DLM_LOCK_RES_DROPPING_REF) {
737 BUG_ON(tmpres->owner == dlm->node_num);
738 __dlm_wait_on_lockres_flags(tmpres,
739 DLM_LOCK_RES_DROPPING_REF);
740 spin_unlock(&tmpres->spinlock);
741 dlm_lockres_put(tmpres);
742 tmpres = NULL;
743 goto lookup;
744 }
745
746
747 dlm_lockres_grab_inflight_ref(dlm, tmpres);
748
749 spin_unlock(&tmpres->spinlock);
750 if (res)
751 dlm_lockres_put(res);
752 res = tmpres;
753 goto leave;
754 }
755
756 if (!res) {
757 spin_unlock(&dlm->spinlock);
758 mlog(0, "allocating a new resource\n");
759
760 alloc_mle = kmem_cache_alloc(dlm_mle_cache, GFP_NOFS);
761 if (!alloc_mle)
762 goto leave;
763 res = dlm_new_lockres(dlm, lockid, namelen);
764 if (!res)
765 goto leave;
766 goto lookup;
767 }
768
769 mlog(0, "no lockres found, allocated our own: %p\n", res);
770
771 if (flags & LKM_LOCAL) {
772
773
774 spin_lock(&res->spinlock);
775 dlm_change_lockres_owner(dlm, res, dlm->node_num);
776 __dlm_insert_lockres(dlm, res);
777 dlm_lockres_grab_inflight_ref(dlm, res);
778 spin_unlock(&res->spinlock);
779 spin_unlock(&dlm->spinlock);
780
781 goto wake_waiters;
782 }
783
784
785 spin_lock(&dlm->master_lock);
786
787
788 blocked = dlm_find_mle(dlm, &mle, (char *)lockid, namelen);
789 if (blocked) {
790 int mig;
791 if (mle->type == DLM_MLE_MASTER) {
792 mlog(ML_ERROR, "master entry for nonexistent lock!\n");
793 BUG();
794 }
795 mig = (mle->type == DLM_MLE_MIGRATION);
796
797
798
799
800
801
802
803
804 if (mig || mle->master != O2NM_MAX_NODES) {
805 BUG_ON(mig && mle->master == dlm->node_num);
806
807
808 mlog(0, "%s:%.*s: late on %s\n",
809 dlm->name, namelen, lockid,
810 mig ? "MIGRATION" : "BLOCK");
811 spin_unlock(&dlm->master_lock);
812 spin_unlock(&dlm->spinlock);
813
814
815 if (!mig)
816 dlm_mle_detach_hb_events(dlm, mle);
817 dlm_put_mle(mle);
818 mle = NULL;
819
820
821 if (mig)
822 msleep(100);
823 goto lookup;
824 }
825 } else {
826
827 mle = alloc_mle;
828
829 alloc_mle = NULL;
830 dlm_init_mle(mle, DLM_MLE_MASTER, dlm, res, NULL, 0);
831 set_bit(dlm->node_num, mle->maybe_map);
832 __dlm_insert_mle(dlm, mle);
833
834
835
836
837
838 bit = find_next_bit(dlm->recovery_map, O2NM_MAX_NODES, 0);
839 if (bit < O2NM_MAX_NODES) {
840 mlog(0, "%s: res %.*s, At least one node (%d) "
841 "to recover before lock mastery can begin\n",
842 dlm->name, namelen, (char *)lockid, bit);
843 wait_on_recovery = 1;
844 }
845 }
846
847
848
849
850
851
852
853 __dlm_insert_lockres(dlm, res);
854
855
856 spin_lock(&res->spinlock);
857 dlm_lockres_grab_inflight_ref(dlm, res);
858 spin_unlock(&res->spinlock);
859
860
861
862
863
864 dlm_get_mle_inuse(mle);
865 spin_unlock(&dlm->master_lock);
866 spin_unlock(&dlm->spinlock);
867
868redo_request:
869 while (wait_on_recovery) {
870
871
872
873 if (dlm_is_recovery_lock(lockid, namelen)) {
874 mlog(0, "%s: Recovery map is not empty, but must "
875 "master $RECOVERY lock now\n", dlm->name);
876 if (!dlm_pre_master_reco_lockres(dlm, res))
877 wait_on_recovery = 0;
878 else {
879 mlog(0, "%s: waiting 500ms for heartbeat state "
880 "change\n", dlm->name);
881 msleep(500);
882 }
883 continue;
884 }
885
886 dlm_kick_recovery_thread(dlm);
887 msleep(1000);
888 dlm_wait_for_recovery(dlm);
889
890 spin_lock(&dlm->spinlock);
891 bit = find_next_bit(dlm->recovery_map, O2NM_MAX_NODES, 0);
892 if (bit < O2NM_MAX_NODES) {
893 mlog(0, "%s: res %.*s, At least one node (%d) "
894 "to recover before lock mastery can begin\n",
895 dlm->name, namelen, (char *)lockid, bit);
896 wait_on_recovery = 1;
897 } else
898 wait_on_recovery = 0;
899 spin_unlock(&dlm->spinlock);
900
901 if (wait_on_recovery)
902 dlm_wait_for_node_recovery(dlm, bit, 10000);
903 }
904
905
906 if (blocked)
907 goto wait;
908
909 ret = -EINVAL;
910 dlm_node_iter_init(mle->vote_map, &iter);
911 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
912 ret = dlm_do_master_request(res, mle, nodenum);
913 if (ret < 0)
914 mlog_errno(ret);
915 if (mle->master != O2NM_MAX_NODES) {
916
917 if (mle->master <= nodenum)
918 break;
919
920
921
922
923 mlog(0, "%s: res %.*s, Requests only up to %u but "
924 "master is %u, keep going\n", dlm->name, namelen,
925 lockid, nodenum, mle->master);
926 }
927 }
928
929wait:
930
931 ret = dlm_wait_for_lock_mastery(dlm, res, mle, &blocked);
932 if (ret < 0) {
933 wait_on_recovery = 1;
934 mlog(0, "%s: res %.*s, Node map changed, redo the master "
935 "request now, blocked=%d\n", dlm->name, res->lockname.len,
936 res->lockname.name, blocked);
937 if (++tries > 20) {
938 mlog(ML_ERROR, "%s: res %.*s, Spinning on "
939 "dlm_wait_for_lock_mastery, blocked = %d\n",
940 dlm->name, res->lockname.len,
941 res->lockname.name, blocked);
942 dlm_print_one_lock_resource(res);
943 dlm_print_one_mle(mle);
944 tries = 0;
945 }
946 goto redo_request;
947 }
948
949 mlog(0, "%s: res %.*s, Mastered by %u\n", dlm->name, res->lockname.len,
950 res->lockname.name, res->owner);
951
952 BUG_ON(res->owner == O2NM_MAX_NODES);
953
954
955 dlm_mle_detach_hb_events(dlm, mle);
956 dlm_put_mle(mle);
957
958 dlm_put_mle_inuse(mle);
959
960wake_waiters:
961 spin_lock(&res->spinlock);
962 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
963 spin_unlock(&res->spinlock);
964 wake_up(&res->wq);
965
966leave:
967
968 if (alloc_mle)
969 kmem_cache_free(dlm_mle_cache, alloc_mle);
970
971 return res;
972}
973
974
975#define DLM_MASTERY_TIMEOUT_MS 5000
976
977static int dlm_wait_for_lock_mastery(struct dlm_ctxt *dlm,
978 struct dlm_lock_resource *res,
979 struct dlm_master_list_entry *mle,
980 int *blocked)
981{
982 u8 m;
983 int ret, bit;
984 int map_changed, voting_done;
985 int assert, sleep;
986
987recheck:
988 ret = 0;
989 assert = 0;
990
991
992 spin_lock(&res->spinlock);
993 if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) {
994 mlog(0, "%s:%.*s: owner is suddenly %u\n", dlm->name,
995 res->lockname.len, res->lockname.name, res->owner);
996 spin_unlock(&res->spinlock);
997
998
999 if (res->owner != dlm->node_num) {
1000 ret = dlm_do_master_request(res, mle, res->owner);
1001 if (ret < 0) {
1002
1003 mlog(ML_ERROR, "link to %u went down?: %d\n", res->owner, ret);
1004 msleep(500);
1005 goto recheck;
1006 }
1007 }
1008 ret = 0;
1009 goto leave;
1010 }
1011 spin_unlock(&res->spinlock);
1012
1013 spin_lock(&mle->spinlock);
1014 m = mle->master;
1015 map_changed = (memcmp(mle->vote_map, mle->node_map,
1016 sizeof(mle->vote_map)) != 0);
1017 voting_done = (memcmp(mle->vote_map, mle->response_map,
1018 sizeof(mle->vote_map)) == 0);
1019
1020
1021 if (map_changed) {
1022 int b;
1023 mlog(0, "%s: %.*s: node map changed, restarting\n",
1024 dlm->name, res->lockname.len, res->lockname.name);
1025 ret = dlm_restart_lock_mastery(dlm, res, mle, *blocked);
1026 b = (mle->type == DLM_MLE_BLOCK);
1027 if ((*blocked && !b) || (!*blocked && b)) {
1028 mlog(0, "%s:%.*s: status change: old=%d new=%d\n",
1029 dlm->name, res->lockname.len, res->lockname.name,
1030 *blocked, b);
1031 *blocked = b;
1032 }
1033 spin_unlock(&mle->spinlock);
1034 if (ret < 0) {
1035 mlog_errno(ret);
1036 goto leave;
1037 }
1038 mlog(0, "%s:%.*s: restart lock mastery succeeded, "
1039 "rechecking now\n", dlm->name, res->lockname.len,
1040 res->lockname.name);
1041 goto recheck;
1042 } else {
1043 if (!voting_done) {
1044 mlog(0, "map not changed and voting not done "
1045 "for %s:%.*s\n", dlm->name, res->lockname.len,
1046 res->lockname.name);
1047 }
1048 }
1049
1050 if (m != O2NM_MAX_NODES) {
1051
1052
1053 sleep = 0;
1054 } else {
1055 sleep = 1;
1056
1057 if (voting_done && !*blocked) {
1058 bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0);
1059 if (dlm->node_num <= bit) {
1060
1061
1062
1063 mle->master = dlm->node_num;
1064
1065
1066 assert = 1;
1067 sleep = 0;
1068 }
1069
1070
1071 }
1072 }
1073
1074 spin_unlock(&mle->spinlock);
1075
1076
1077 if (sleep) {
1078 unsigned long timeo = msecs_to_jiffies(DLM_MASTERY_TIMEOUT_MS);
1079
1080
1081
1082
1083
1084
1085
1086 atomic_set(&mle->woken, 0);
1087 (void)wait_event_timeout(mle->wq,
1088 (atomic_read(&mle->woken) == 1),
1089 timeo);
1090 if (res->owner == O2NM_MAX_NODES) {
1091 mlog(0, "%s:%.*s: waiting again\n", dlm->name,
1092 res->lockname.len, res->lockname.name);
1093 goto recheck;
1094 }
1095 mlog(0, "done waiting, master is %u\n", res->owner);
1096 ret = 0;
1097 goto leave;
1098 }
1099
1100 ret = 0;
1101 if (assert) {
1102 m = dlm->node_num;
1103 mlog(0, "about to master %.*s here, this=%u\n",
1104 res->lockname.len, res->lockname.name, m);
1105 ret = dlm_do_assert_master(dlm, res, mle->vote_map, 0);
1106 if (ret) {
1107
1108
1109
1110
1111
1112 mlog_errno(ret);
1113 }
1114
1115
1116 ret = 0;
1117 }
1118
1119
1120 spin_lock(&res->spinlock);
1121
1122
1123 dlm_change_lockres_owner(dlm, res, m);
1124 spin_unlock(&res->spinlock);
1125
1126leave:
1127 return ret;
1128}
1129
1130struct dlm_bitmap_diff_iter
1131{
1132 int curnode;
1133 unsigned long *orig_bm;
1134 unsigned long *cur_bm;
1135 unsigned long diff_bm[BITS_TO_LONGS(O2NM_MAX_NODES)];
1136};
1137
1138enum dlm_node_state_change
1139{
1140 NODE_DOWN = -1,
1141 NODE_NO_CHANGE = 0,
1142 NODE_UP
1143};
1144
1145static void dlm_bitmap_diff_iter_init(struct dlm_bitmap_diff_iter *iter,
1146 unsigned long *orig_bm,
1147 unsigned long *cur_bm)
1148{
1149 unsigned long p1, p2;
1150 int i;
1151
1152 iter->curnode = -1;
1153 iter->orig_bm = orig_bm;
1154 iter->cur_bm = cur_bm;
1155
1156 for (i = 0; i < BITS_TO_LONGS(O2NM_MAX_NODES); i++) {
1157 p1 = *(iter->orig_bm + i);
1158 p2 = *(iter->cur_bm + i);
1159 iter->diff_bm[i] = (p1 & ~p2) | (p2 & ~p1);
1160 }
1161}
1162
1163static int dlm_bitmap_diff_iter_next(struct dlm_bitmap_diff_iter *iter,
1164 enum dlm_node_state_change *state)
1165{
1166 int bit;
1167
1168 if (iter->curnode >= O2NM_MAX_NODES)
1169 return -ENOENT;
1170
1171 bit = find_next_bit(iter->diff_bm, O2NM_MAX_NODES,
1172 iter->curnode+1);
1173 if (bit >= O2NM_MAX_NODES) {
1174 iter->curnode = O2NM_MAX_NODES;
1175 return -ENOENT;
1176 }
1177
1178
1179 if (test_bit(bit, iter->orig_bm))
1180 *state = NODE_DOWN;
1181 else
1182 *state = NODE_UP;
1183
1184 iter->curnode = bit;
1185 return bit;
1186}
1187
1188
1189static int dlm_restart_lock_mastery(struct dlm_ctxt *dlm,
1190 struct dlm_lock_resource *res,
1191 struct dlm_master_list_entry *mle,
1192 int blocked)
1193{
1194 struct dlm_bitmap_diff_iter bdi;
1195 enum dlm_node_state_change sc;
1196 int node;
1197 int ret = 0;
1198
1199 mlog(0, "something happened such that the "
1200 "master process may need to be restarted!\n");
1201
1202 assert_spin_locked(&mle->spinlock);
1203
1204 dlm_bitmap_diff_iter_init(&bdi, mle->vote_map, mle->node_map);
1205 node = dlm_bitmap_diff_iter_next(&bdi, &sc);
1206 while (node >= 0) {
1207 if (sc == NODE_UP) {
1208
1209
1210
1211 mlog(ML_NOTICE, "node %d up while restarting\n", node);
1212
1213
1214 mlog(0, "sending request to new node\n");
1215 clear_bit(node, mle->response_map);
1216 set_bit(node, mle->vote_map);
1217 } else {
1218 mlog(ML_ERROR, "node down! %d\n", node);
1219 if (blocked) {
1220 int lowest = find_next_bit(mle->maybe_map,
1221 O2NM_MAX_NODES, 0);
1222
1223
1224 clear_bit(node, mle->maybe_map);
1225
1226 if (node == lowest) {
1227 mlog(0, "expected master %u died"
1228 " while this node was blocked "
1229 "waiting on it!\n", node);
1230 lowest = find_next_bit(mle->maybe_map,
1231 O2NM_MAX_NODES,
1232 lowest+1);
1233 if (lowest < O2NM_MAX_NODES) {
1234 mlog(0, "%s:%.*s:still "
1235 "blocked. waiting on %u "
1236 "now\n", dlm->name,
1237 res->lockname.len,
1238 res->lockname.name,
1239 lowest);
1240 } else {
1241
1242
1243
1244
1245
1246
1247
1248
1249 mlog(0, "%s:%.*s: no "
1250 "longer blocking. try to "
1251 "master this here\n",
1252 dlm->name,
1253 res->lockname.len,
1254 res->lockname.name);
1255 mle->type = DLM_MLE_MASTER;
1256 mle->mleres = res;
1257 }
1258 }
1259 }
1260
1261
1262
1263 memset(mle->maybe_map, 0, sizeof(mle->maybe_map));
1264 memset(mle->response_map, 0, sizeof(mle->response_map));
1265
1266 memcpy(mle->vote_map, mle->node_map,
1267 sizeof(mle->node_map));
1268
1269 if (mle->type != DLM_MLE_BLOCK)
1270 set_bit(dlm->node_num, mle->maybe_map);
1271 }
1272 ret = -EAGAIN;
1273 node = dlm_bitmap_diff_iter_next(&bdi, &sc);
1274 }
1275 return ret;
1276}
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289static int dlm_do_master_request(struct dlm_lock_resource *res,
1290 struct dlm_master_list_entry *mle, int to)
1291{
1292 struct dlm_ctxt *dlm = mle->dlm;
1293 struct dlm_master_request request;
1294 int ret, response=0, resend;
1295
1296 memset(&request, 0, sizeof(request));
1297 request.node_idx = dlm->node_num;
1298
1299 BUG_ON(mle->type == DLM_MLE_MIGRATION);
1300
1301 request.namelen = (u8)mle->mnamelen;
1302 memcpy(request.name, mle->mname, request.namelen);
1303
1304again:
1305 ret = o2net_send_message(DLM_MASTER_REQUEST_MSG, dlm->key, &request,
1306 sizeof(request), to, &response);
1307 if (ret < 0) {
1308 if (ret == -ESRCH) {
1309
1310 mlog(ML_ERROR, "TCP stack not ready!\n");
1311 BUG();
1312 } else if (ret == -EINVAL) {
1313 mlog(ML_ERROR, "bad args passed to o2net!\n");
1314 BUG();
1315 } else if (ret == -ENOMEM) {
1316 mlog(ML_ERROR, "out of memory while trying to send "
1317 "network message! retrying\n");
1318
1319 msleep(50);
1320 goto again;
1321 } else if (!dlm_is_host_down(ret)) {
1322
1323 mlog_errno(ret);
1324 mlog(ML_ERROR, "unhandled error!");
1325 BUG();
1326 }
1327
1328
1329 mlog(ML_ERROR, "link to %d went down!\n", to);
1330 goto out;
1331 }
1332
1333 ret = 0;
1334 resend = 0;
1335 spin_lock(&mle->spinlock);
1336 switch (response) {
1337 case DLM_MASTER_RESP_YES:
1338 set_bit(to, mle->response_map);
1339 mlog(0, "node %u is the master, response=YES\n", to);
1340 mlog(0, "%s:%.*s: master node %u now knows I have a "
1341 "reference\n", dlm->name, res->lockname.len,
1342 res->lockname.name, to);
1343 mle->master = to;
1344 break;
1345 case DLM_MASTER_RESP_NO:
1346 mlog(0, "node %u not master, response=NO\n", to);
1347 set_bit(to, mle->response_map);
1348 break;
1349 case DLM_MASTER_RESP_MAYBE:
1350 mlog(0, "node %u not master, response=MAYBE\n", to);
1351 set_bit(to, mle->response_map);
1352 set_bit(to, mle->maybe_map);
1353 break;
1354 case DLM_MASTER_RESP_ERROR:
1355 mlog(0, "node %u hit an error, resending\n", to);
1356 resend = 1;
1357 response = 0;
1358 break;
1359 default:
1360 mlog(ML_ERROR, "bad response! %u\n", response);
1361 BUG();
1362 }
1363 spin_unlock(&mle->spinlock);
1364 if (resend) {
1365
1366 msleep(50);
1367 goto again;
1368 }
1369
1370out:
1371 return ret;
1372}
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383int dlm_master_request_handler(struct o2net_msg *msg, u32 len, void *data,
1384 void **ret_data)
1385{
1386 u8 response = DLM_MASTER_RESP_MAYBE;
1387 struct dlm_ctxt *dlm = data;
1388 struct dlm_lock_resource *res = NULL;
1389 struct dlm_master_request *request = (struct dlm_master_request *) msg->buf;
1390 struct dlm_master_list_entry *mle = NULL, *tmpmle = NULL;
1391 char *name;
1392 unsigned int namelen, hash;
1393 int found, ret;
1394 int set_maybe;
1395 int dispatch_assert = 0;
1396
1397 if (!dlm_grab(dlm))
1398 return DLM_MASTER_RESP_NO;
1399
1400 if (!dlm_domain_fully_joined(dlm)) {
1401 response = DLM_MASTER_RESP_NO;
1402 goto send_response;
1403 }
1404
1405 name = request->name;
1406 namelen = request->namelen;
1407 hash = dlm_lockid_hash(name, namelen);
1408
1409 if (namelen > DLM_LOCKID_NAME_MAX) {
1410 response = DLM_IVBUFLEN;
1411 goto send_response;
1412 }
1413
1414way_up_top:
1415 spin_lock(&dlm->spinlock);
1416 res = __dlm_lookup_lockres(dlm, name, namelen, hash);
1417 if (res) {
1418 spin_unlock(&dlm->spinlock);
1419
1420
1421 spin_lock(&res->spinlock);
1422 if (res->state & (DLM_LOCK_RES_RECOVERING|
1423 DLM_LOCK_RES_MIGRATING)) {
1424 spin_unlock(&res->spinlock);
1425 mlog(0, "returning DLM_MASTER_RESP_ERROR since res is "
1426 "being recovered/migrated\n");
1427 response = DLM_MASTER_RESP_ERROR;
1428 if (mle)
1429 kmem_cache_free(dlm_mle_cache, mle);
1430 goto send_response;
1431 }
1432
1433 if (res->owner == dlm->node_num) {
1434 dlm_lockres_set_refmap_bit(dlm, res, request->node_idx);
1435 spin_unlock(&res->spinlock);
1436 response = DLM_MASTER_RESP_YES;
1437 if (mle)
1438 kmem_cache_free(dlm_mle_cache, mle);
1439
1440
1441
1442
1443
1444
1445
1446 dispatch_assert = 1;
1447 goto send_response;
1448 } else if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) {
1449 spin_unlock(&res->spinlock);
1450
1451 response = DLM_MASTER_RESP_NO;
1452 if (mle)
1453 kmem_cache_free(dlm_mle_cache, mle);
1454 goto send_response;
1455 }
1456
1457
1458
1459
1460 if (!(res->state & DLM_LOCK_RES_IN_PROGRESS)) {
1461 mlog(ML_ERROR, "lock with no owner should be "
1462 "in-progress!\n");
1463 BUG();
1464 }
1465
1466
1467 spin_lock(&dlm->master_lock);
1468 found = dlm_find_mle(dlm, &tmpmle, name, namelen);
1469 if (!found) {
1470 mlog(ML_ERROR, "no mle found for this lock!\n");
1471 BUG();
1472 }
1473 set_maybe = 1;
1474 spin_lock(&tmpmle->spinlock);
1475 if (tmpmle->type == DLM_MLE_BLOCK) {
1476
1477
1478 response = DLM_MASTER_RESP_NO;
1479 } else if (tmpmle->type == DLM_MLE_MIGRATION) {
1480 mlog(0, "node %u is master, but trying to migrate to "
1481 "node %u.\n", tmpmle->master, tmpmle->new_master);
1482 if (tmpmle->master == dlm->node_num) {
1483 mlog(ML_ERROR, "no owner on lockres, but this "
1484 "node is trying to migrate it to %u?!\n",
1485 tmpmle->new_master);
1486 BUG();
1487 } else {
1488
1489 response = DLM_MASTER_RESP_NO;
1490 }
1491 } else if (tmpmle->master != DLM_LOCK_RES_OWNER_UNKNOWN) {
1492 set_maybe = 0;
1493 if (tmpmle->master == dlm->node_num) {
1494 response = DLM_MASTER_RESP_YES;
1495
1496
1497
1498 dispatch_assert = 1;
1499 dlm_lockres_set_refmap_bit(dlm, res,
1500 request->node_idx);
1501 } else
1502 response = DLM_MASTER_RESP_NO;
1503 } else {
1504
1505
1506 response = DLM_MASTER_RESP_MAYBE;
1507 }
1508 if (set_maybe)
1509 set_bit(request->node_idx, tmpmle->maybe_map);
1510 spin_unlock(&tmpmle->spinlock);
1511
1512 spin_unlock(&dlm->master_lock);
1513 spin_unlock(&res->spinlock);
1514
1515
1516 dlm_put_mle(tmpmle);
1517 if (mle)
1518 kmem_cache_free(dlm_mle_cache, mle);
1519 goto send_response;
1520 }
1521
1522
1523
1524
1525
1526
1527
1528 spin_lock(&dlm->master_lock);
1529 found = dlm_find_mle(dlm, &tmpmle, name, namelen);
1530 if (!found) {
1531
1532
1533 if (!mle) {
1534 spin_unlock(&dlm->master_lock);
1535 spin_unlock(&dlm->spinlock);
1536
1537 mle = kmem_cache_alloc(dlm_mle_cache, GFP_NOFS);
1538 if (!mle) {
1539 response = DLM_MASTER_RESP_ERROR;
1540 mlog_errno(-ENOMEM);
1541 goto send_response;
1542 }
1543 goto way_up_top;
1544 }
1545
1546
1547
1548 dlm_init_mle(mle, DLM_MLE_BLOCK, dlm, NULL, name, namelen);
1549 set_bit(request->node_idx, mle->maybe_map);
1550 __dlm_insert_mle(dlm, mle);
1551 response = DLM_MASTER_RESP_NO;
1552 } else {
1553
1554 set_maybe = 1;
1555 spin_lock(&tmpmle->spinlock);
1556 if (tmpmle->master == dlm->node_num) {
1557 mlog(ML_ERROR, "no lockres, but an mle with this node as master!\n");
1558 BUG();
1559 }
1560 if (tmpmle->type == DLM_MLE_BLOCK)
1561 response = DLM_MASTER_RESP_NO;
1562 else if (tmpmle->type == DLM_MLE_MIGRATION) {
1563 mlog(0, "migration mle was found (%u->%u)\n",
1564 tmpmle->master, tmpmle->new_master);
1565
1566 response = DLM_MASTER_RESP_NO;
1567 } else
1568 response = DLM_MASTER_RESP_MAYBE;
1569 if (set_maybe)
1570 set_bit(request->node_idx, tmpmle->maybe_map);
1571 spin_unlock(&tmpmle->spinlock);
1572 }
1573 spin_unlock(&dlm->master_lock);
1574 spin_unlock(&dlm->spinlock);
1575
1576 if (found) {
1577
1578 dlm_put_mle(tmpmle);
1579 }
1580send_response:
1581
1582
1583
1584
1585
1586
1587 if (dispatch_assert) {
1588 if (response != DLM_MASTER_RESP_YES)
1589 mlog(ML_ERROR, "invalid response %d\n", response);
1590 if (!res) {
1591 mlog(ML_ERROR, "bad lockres while trying to assert!\n");
1592 BUG();
1593 }
1594 mlog(0, "%u is the owner of %.*s, cleaning everyone else\n",
1595 dlm->node_num, res->lockname.len, res->lockname.name);
1596 ret = dlm_dispatch_assert_master(dlm, res, 0, request->node_idx,
1597 DLM_ASSERT_MASTER_MLE_CLEANUP);
1598 if (ret < 0) {
1599 mlog(ML_ERROR, "failed to dispatch assert master work\n");
1600 response = DLM_MASTER_RESP_ERROR;
1601 dlm_lockres_put(res);
1602 }
1603 } else {
1604 if (res)
1605 dlm_lockres_put(res);
1606 }
1607
1608 dlm_put(dlm);
1609 return response;
1610}
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622static int dlm_do_assert_master(struct dlm_ctxt *dlm,
1623 struct dlm_lock_resource *res,
1624 void *nodemap, u32 flags)
1625{
1626 struct dlm_assert_master assert;
1627 int to, tmpret;
1628 struct dlm_node_iter iter;
1629 int ret = 0;
1630 int reassert;
1631 const char *lockname = res->lockname.name;
1632 unsigned int namelen = res->lockname.len;
1633
1634 BUG_ON(namelen > O2NM_MAX_NAME_LEN);
1635
1636 spin_lock(&res->spinlock);
1637 res->state |= DLM_LOCK_RES_SETREF_INPROG;
1638 spin_unlock(&res->spinlock);
1639
1640again:
1641 reassert = 0;
1642
1643
1644 dlm_node_iter_init(nodemap, &iter);
1645 while ((to = dlm_node_iter_next(&iter)) >= 0) {
1646 int r = 0;
1647 struct dlm_master_list_entry *mle = NULL;
1648
1649 mlog(0, "sending assert master to %d (%.*s)\n", to,
1650 namelen, lockname);
1651 memset(&assert, 0, sizeof(assert));
1652 assert.node_idx = dlm->node_num;
1653 assert.namelen = namelen;
1654 memcpy(assert.name, lockname, namelen);
1655 assert.flags = cpu_to_be32(flags);
1656
1657 tmpret = o2net_send_message(DLM_ASSERT_MASTER_MSG, dlm->key,
1658 &assert, sizeof(assert), to, &r);
1659 if (tmpret < 0) {
1660 mlog(ML_ERROR, "Error %d when sending message %u (key "
1661 "0x%x) to node %u\n", tmpret,
1662 DLM_ASSERT_MASTER_MSG, dlm->key, to);
1663 if (!dlm_is_host_down(tmpret)) {
1664 mlog(ML_ERROR, "unhandled error=%d!\n", tmpret);
1665 BUG();
1666 }
1667
1668 mlog(0, "link to %d went down!\n", to);
1669
1670 ret = tmpret;
1671 r = 0;
1672 } else if (r < 0) {
1673
1674 mlog(ML_ERROR,"during assert master of %.*s to %u, "
1675 "got %d.\n", namelen, lockname, to, r);
1676 spin_lock(&dlm->spinlock);
1677 spin_lock(&dlm->master_lock);
1678 if (dlm_find_mle(dlm, &mle, (char *)lockname,
1679 namelen)) {
1680 dlm_print_one_mle(mle);
1681 __dlm_put_mle(mle);
1682 }
1683 spin_unlock(&dlm->master_lock);
1684 spin_unlock(&dlm->spinlock);
1685 BUG();
1686 }
1687
1688 if (r & DLM_ASSERT_RESPONSE_REASSERT &&
1689 !(r & DLM_ASSERT_RESPONSE_MASTERY_REF)) {
1690 mlog(ML_ERROR, "%.*s: very strange, "
1691 "master MLE but no lockres on %u\n",
1692 namelen, lockname, to);
1693 }
1694
1695 if (r & DLM_ASSERT_RESPONSE_REASSERT) {
1696 mlog(0, "%.*s: node %u create mles on other "
1697 "nodes and requests a re-assert\n",
1698 namelen, lockname, to);
1699 reassert = 1;
1700 }
1701 if (r & DLM_ASSERT_RESPONSE_MASTERY_REF) {
1702 mlog(0, "%.*s: node %u has a reference to this "
1703 "lockres, set the bit in the refmap\n",
1704 namelen, lockname, to);
1705 spin_lock(&res->spinlock);
1706 dlm_lockres_set_refmap_bit(dlm, res, to);
1707 spin_unlock(&res->spinlock);
1708 }
1709 }
1710
1711 if (reassert)
1712 goto again;
1713
1714 spin_lock(&res->spinlock);
1715 res->state &= ~DLM_LOCK_RES_SETREF_INPROG;
1716 spin_unlock(&res->spinlock);
1717 wake_up(&res->wq);
1718
1719 return ret;
1720}
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731int dlm_assert_master_handler(struct o2net_msg *msg, u32 len, void *data,
1732 void **ret_data)
1733{
1734 struct dlm_ctxt *dlm = data;
1735 struct dlm_master_list_entry *mle = NULL;
1736 struct dlm_assert_master *assert = (struct dlm_assert_master *)msg->buf;
1737 struct dlm_lock_resource *res = NULL;
1738 char *name;
1739 unsigned int namelen, hash;
1740 u32 flags;
1741 int master_request = 0, have_lockres_ref = 0;
1742 int ret = 0;
1743
1744 if (!dlm_grab(dlm))
1745 return 0;
1746
1747 name = assert->name;
1748 namelen = assert->namelen;
1749 hash = dlm_lockid_hash(name, namelen);
1750 flags = be32_to_cpu(assert->flags);
1751
1752 if (namelen > DLM_LOCKID_NAME_MAX) {
1753 mlog(ML_ERROR, "Invalid name length!");
1754 goto done;
1755 }
1756
1757 spin_lock(&dlm->spinlock);
1758
1759 if (flags)
1760 mlog(0, "assert_master with flags: %u\n", flags);
1761
1762
1763 spin_lock(&dlm->master_lock);
1764 if (!dlm_find_mle(dlm, &mle, name, namelen)) {
1765
1766 mlog(0, "just got an assert_master from %u, but no "
1767 "MLE for it! (%.*s)\n", assert->node_idx,
1768 namelen, name);
1769 } else {
1770 int bit = find_next_bit (mle->maybe_map, O2NM_MAX_NODES, 0);
1771 if (bit >= O2NM_MAX_NODES) {
1772
1773
1774 mlog(0, "no bits set in the maybe_map, but %u "
1775 "is asserting! (%.*s)\n", assert->node_idx,
1776 namelen, name);
1777 } else if (bit != assert->node_idx) {
1778 if (flags & DLM_ASSERT_MASTER_MLE_CLEANUP) {
1779 mlog(0, "master %u was found, %u should "
1780 "back off\n", assert->node_idx, bit);
1781 } else {
1782
1783
1784
1785
1786 mlog(0, "%u is the lowest node, "
1787 "%u is asserting. (%.*s) %u must "
1788 "have begun after %u won.\n", bit,
1789 assert->node_idx, namelen, name, bit,
1790 assert->node_idx);
1791 }
1792 }
1793 if (mle->type == DLM_MLE_MIGRATION) {
1794 if (flags & DLM_ASSERT_MASTER_MLE_CLEANUP) {
1795 mlog(0, "%s:%.*s: got cleanup assert"
1796 " from %u for migration\n",
1797 dlm->name, namelen, name,
1798 assert->node_idx);
1799 } else if (!(flags & DLM_ASSERT_MASTER_FINISH_MIGRATION)) {
1800 mlog(0, "%s:%.*s: got unrelated assert"
1801 " from %u for migration, ignoring\n",
1802 dlm->name, namelen, name,
1803 assert->node_idx);
1804 __dlm_put_mle(mle);
1805 spin_unlock(&dlm->master_lock);
1806 spin_unlock(&dlm->spinlock);
1807 goto done;
1808 }
1809 }
1810 }
1811 spin_unlock(&dlm->master_lock);
1812
1813
1814
1815 res = __dlm_lookup_lockres(dlm, name, namelen, hash);
1816 if (res) {
1817 spin_lock(&res->spinlock);
1818 if (res->state & DLM_LOCK_RES_RECOVERING) {
1819 mlog(ML_ERROR, "%u asserting but %.*s is "
1820 "RECOVERING!\n", assert->node_idx, namelen, name);
1821 goto kill;
1822 }
1823 if (!mle) {
1824 if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN &&
1825 res->owner != assert->node_idx) {
1826 mlog(ML_ERROR, "DIE! Mastery assert from %u, "
1827 "but current owner is %u! (%.*s)\n",
1828 assert->node_idx, res->owner, namelen,
1829 name);
1830 __dlm_print_one_lock_resource(res);
1831 BUG();
1832 }
1833 } else if (mle->type != DLM_MLE_MIGRATION) {
1834 if (res->owner != DLM_LOCK_RES_OWNER_UNKNOWN) {
1835
1836 if (res->owner == assert->node_idx) {
1837 mlog(0, "owner %u re-asserting on "
1838 "lock %.*s\n", assert->node_idx,
1839 namelen, name);
1840 goto ok;
1841 }
1842 mlog(ML_ERROR, "got assert_master from "
1843 "node %u, but %u is the owner! "
1844 "(%.*s)\n", assert->node_idx,
1845 res->owner, namelen, name);
1846 goto kill;
1847 }
1848 if (!(res->state & DLM_LOCK_RES_IN_PROGRESS)) {
1849 mlog(ML_ERROR, "got assert from %u, but lock "
1850 "with no owner should be "
1851 "in-progress! (%.*s)\n",
1852 assert->node_idx,
1853 namelen, name);
1854 goto kill;
1855 }
1856 } else {
1857
1858 if (assert->node_idx != mle->new_master) {
1859 mlog(ML_ERROR, "got assert from %u, but "
1860 "new master is %u, and old master "
1861 "was %u (%.*s)\n",
1862 assert->node_idx, mle->new_master,
1863 mle->master, namelen, name);
1864 goto kill;
1865 }
1866
1867 }
1868ok:
1869 spin_unlock(&res->spinlock);
1870 }
1871
1872
1873
1874 if (mle) {
1875 int extra_ref = 0;
1876 int nn = -1;
1877 int rr, err = 0;
1878
1879 spin_lock(&mle->spinlock);
1880 if (mle->type == DLM_MLE_BLOCK || mle->type == DLM_MLE_MIGRATION)
1881 extra_ref = 1;
1882 else {
1883
1884
1885
1886 while ((nn = find_next_bit (mle->response_map, O2NM_MAX_NODES,
1887 nn+1)) < O2NM_MAX_NODES) {
1888 if (nn != dlm->node_num && nn != assert->node_idx) {
1889 master_request = 1;
1890 break;
1891 }
1892 }
1893 }
1894 mle->master = assert->node_idx;
1895 atomic_set(&mle->woken, 1);
1896 wake_up(&mle->wq);
1897 spin_unlock(&mle->spinlock);
1898
1899 if (res) {
1900 int wake = 0;
1901 spin_lock(&res->spinlock);
1902 if (mle->type == DLM_MLE_MIGRATION) {
1903 mlog(0, "finishing off migration of lockres %.*s, "
1904 "from %u to %u\n",
1905 res->lockname.len, res->lockname.name,
1906 dlm->node_num, mle->new_master);
1907 res->state &= ~DLM_LOCK_RES_MIGRATING;
1908 wake = 1;
1909 dlm_change_lockres_owner(dlm, res, mle->new_master);
1910 BUG_ON(res->state & DLM_LOCK_RES_DIRTY);
1911 } else {
1912 dlm_change_lockres_owner(dlm, res, mle->master);
1913 }
1914 spin_unlock(&res->spinlock);
1915 have_lockres_ref = 1;
1916 if (wake)
1917 wake_up(&res->wq);
1918 }
1919
1920
1921
1922
1923 spin_lock(&dlm->master_lock);
1924
1925 rr = atomic_read(&mle->mle_refs.refcount);
1926 if (mle->inuse > 0) {
1927 if (extra_ref && rr < 3)
1928 err = 1;
1929 else if (!extra_ref && rr < 2)
1930 err = 1;
1931 } else {
1932 if (extra_ref && rr < 2)
1933 err = 1;
1934 else if (!extra_ref && rr < 1)
1935 err = 1;
1936 }
1937 if (err) {
1938 mlog(ML_ERROR, "%s:%.*s: got assert master from %u "
1939 "that will mess up this node, refs=%d, extra=%d, "
1940 "inuse=%d\n", dlm->name, namelen, name,
1941 assert->node_idx, rr, extra_ref, mle->inuse);
1942 dlm_print_one_mle(mle);
1943 }
1944 __dlm_unlink_mle(dlm, mle);
1945 __dlm_mle_detach_hb_events(dlm, mle);
1946 __dlm_put_mle(mle);
1947 if (extra_ref) {
1948
1949
1950
1951
1952 __dlm_put_mle(mle);
1953 }
1954 spin_unlock(&dlm->master_lock);
1955 } else if (res) {
1956 if (res->owner != assert->node_idx) {
1957 mlog(0, "assert_master from %u, but current "
1958 "owner is %u (%.*s), no mle\n", assert->node_idx,
1959 res->owner, namelen, name);
1960 }
1961 }
1962 spin_unlock(&dlm->spinlock);
1963
1964done:
1965 ret = 0;
1966 if (res) {
1967 spin_lock(&res->spinlock);
1968 res->state |= DLM_LOCK_RES_SETREF_INPROG;
1969 spin_unlock(&res->spinlock);
1970 *ret_data = (void *)res;
1971 }
1972 dlm_put(dlm);
1973 if (master_request) {
1974 mlog(0, "need to tell master to reassert\n");
1975
1976 ret |= DLM_ASSERT_RESPONSE_REASSERT;
1977 if (!have_lockres_ref) {
1978 mlog(ML_ERROR, "strange, got assert from %u, MASTER "
1979 "mle present here for %s:%.*s, but no lockres!\n",
1980 assert->node_idx, dlm->name, namelen, name);
1981 }
1982 }
1983 if (have_lockres_ref) {
1984
1985 ret |= DLM_ASSERT_RESPONSE_MASTERY_REF;
1986 mlog(0, "%s:%.*s: got assert from %u, need a ref\n",
1987 dlm->name, namelen, name, assert->node_idx);
1988 }
1989 return ret;
1990
1991kill:
1992
1993 mlog(ML_ERROR, "Bad message received from another node. Dumping state "
1994 "and killing the other node now! This node is OK and can continue.\n");
1995 __dlm_print_one_lock_resource(res);
1996 spin_unlock(&res->spinlock);
1997 spin_unlock(&dlm->spinlock);
1998 *ret_data = (void *)res;
1999 dlm_put(dlm);
2000 return -EINVAL;
2001}
2002
2003void dlm_assert_master_post_handler(int status, void *data, void *ret_data)
2004{
2005 struct dlm_lock_resource *res = (struct dlm_lock_resource *)ret_data;
2006
2007 if (ret_data) {
2008 spin_lock(&res->spinlock);
2009 res->state &= ~DLM_LOCK_RES_SETREF_INPROG;
2010 spin_unlock(&res->spinlock);
2011 wake_up(&res->wq);
2012 dlm_lockres_put(res);
2013 }
2014 return;
2015}
2016
2017int dlm_dispatch_assert_master(struct dlm_ctxt *dlm,
2018 struct dlm_lock_resource *res,
2019 int ignore_higher, u8 request_from, u32 flags)
2020{
2021 struct dlm_work_item *item;
2022 item = kzalloc(sizeof(*item), GFP_ATOMIC);
2023 if (!item)
2024 return -ENOMEM;
2025
2026
2027
2028 dlm_grab(dlm);
2029 dlm_init_work_item(dlm, item, dlm_assert_master_worker, NULL);
2030 item->u.am.lockres = res;
2031
2032 item->u.am.ignore_higher = ignore_higher;
2033 item->u.am.request_from = request_from;
2034 item->u.am.flags = flags;
2035
2036 if (ignore_higher)
2037 mlog(0, "IGNORE HIGHER: %.*s\n", res->lockname.len,
2038 res->lockname.name);
2039
2040 spin_lock(&dlm->work_lock);
2041 list_add_tail(&item->list, &dlm->work_list);
2042 spin_unlock(&dlm->work_lock);
2043
2044 queue_work(dlm->dlm_worker, &dlm->dispatched_work);
2045 return 0;
2046}
2047
2048static void dlm_assert_master_worker(struct dlm_work_item *item, void *data)
2049{
2050 struct dlm_ctxt *dlm = data;
2051 int ret = 0;
2052 struct dlm_lock_resource *res;
2053 unsigned long nodemap[BITS_TO_LONGS(O2NM_MAX_NODES)];
2054 int ignore_higher;
2055 int bit;
2056 u8 request_from;
2057 u32 flags;
2058
2059 dlm = item->dlm;
2060 res = item->u.am.lockres;
2061 ignore_higher = item->u.am.ignore_higher;
2062 request_from = item->u.am.request_from;
2063 flags = item->u.am.flags;
2064
2065 spin_lock(&dlm->spinlock);
2066 memcpy(nodemap, dlm->domain_map, sizeof(nodemap));
2067 spin_unlock(&dlm->spinlock);
2068
2069 clear_bit(dlm->node_num, nodemap);
2070 if (ignore_higher) {
2071
2072
2073
2074 clear_bit(request_from, nodemap);
2075 bit = dlm->node_num;
2076 while (1) {
2077 bit = find_next_bit(nodemap, O2NM_MAX_NODES,
2078 bit+1);
2079 if (bit >= O2NM_MAX_NODES)
2080 break;
2081 clear_bit(bit, nodemap);
2082 }
2083 }
2084
2085
2086
2087
2088
2089
2090
2091 spin_lock(&res->spinlock);
2092 if (res->state & DLM_LOCK_RES_MIGRATING) {
2093 mlog(0, "Someone asked us to assert mastery, but we're "
2094 "in the middle of migration. Skipping assert, "
2095 "the new master will handle that.\n");
2096 spin_unlock(&res->spinlock);
2097 goto put;
2098 } else
2099 __dlm_lockres_reserve_ast(res);
2100 spin_unlock(&res->spinlock);
2101
2102
2103
2104 mlog(0, "worker about to master %.*s here, this=%u\n",
2105 res->lockname.len, res->lockname.name, dlm->node_num);
2106 ret = dlm_do_assert_master(dlm, res, nodemap, flags);
2107 if (ret < 0) {
2108
2109 if (!dlm_is_host_down(ret))
2110 mlog_errno(ret);
2111 }
2112
2113
2114 dlm_lockres_release_ast(dlm, res);
2115
2116put:
2117 dlm_lockres_put(res);
2118
2119 mlog(0, "finished with dlm_assert_master_worker\n");
2120}
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132static int dlm_pre_master_reco_lockres(struct dlm_ctxt *dlm,
2133 struct dlm_lock_resource *res)
2134{
2135 struct dlm_node_iter iter;
2136 int nodenum;
2137 int ret = 0;
2138 u8 master = DLM_LOCK_RES_OWNER_UNKNOWN;
2139
2140 spin_lock(&dlm->spinlock);
2141 dlm_node_iter_init(dlm->domain_map, &iter);
2142 spin_unlock(&dlm->spinlock);
2143
2144 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
2145
2146 if (nodenum == dlm->node_num)
2147 continue;
2148 ret = dlm_do_master_requery(dlm, res, nodenum, &master);
2149 if (ret < 0) {
2150 mlog_errno(ret);
2151 if (!dlm_is_host_down(ret))
2152 BUG();
2153
2154
2155 ret = 0;
2156 }
2157
2158 if (master != DLM_LOCK_RES_OWNER_UNKNOWN) {
2159
2160 spin_lock(&dlm->spinlock);
2161 if (test_bit(master, dlm->recovery_map)) {
2162 mlog(ML_NOTICE, "%s: node %u has not seen "
2163 "node %u go down yet, and thinks the "
2164 "dead node is mastering the recovery "
2165 "lock. must wait.\n", dlm->name,
2166 nodenum, master);
2167 ret = -EAGAIN;
2168 }
2169 spin_unlock(&dlm->spinlock);
2170 mlog(0, "%s: reco lock master is %u\n", dlm->name,
2171 master);
2172 break;
2173 }
2174 }
2175 return ret;
2176}
2177
2178
2179
2180
2181
2182int dlm_drop_lockres_ref(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
2183{
2184 struct dlm_deref_lockres deref;
2185 int ret = 0, r;
2186 const char *lockname;
2187 unsigned int namelen;
2188
2189 lockname = res->lockname.name;
2190 namelen = res->lockname.len;
2191 BUG_ON(namelen > O2NM_MAX_NAME_LEN);
2192
2193 memset(&deref, 0, sizeof(deref));
2194 deref.node_idx = dlm->node_num;
2195 deref.namelen = namelen;
2196 memcpy(deref.name, lockname, namelen);
2197
2198 ret = o2net_send_message(DLM_DEREF_LOCKRES_MSG, dlm->key,
2199 &deref, sizeof(deref), res->owner, &r);
2200 if (ret < 0)
2201 mlog(ML_ERROR, "%s: res %.*s, error %d send DEREF to node %u\n",
2202 dlm->name, namelen, lockname, ret, res->owner);
2203 else if (r < 0) {
2204
2205 mlog(ML_ERROR, "%s: res %.*s, DEREF to node %u got %d\n",
2206 dlm->name, namelen, lockname, res->owner, r);
2207 dlm_print_one_lock_resource(res);
2208 BUG();
2209 }
2210 return ret;
2211}
2212
2213int dlm_deref_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
2214 void **ret_data)
2215{
2216 struct dlm_ctxt *dlm = data;
2217 struct dlm_deref_lockres *deref = (struct dlm_deref_lockres *)msg->buf;
2218 struct dlm_lock_resource *res = NULL;
2219 char *name;
2220 unsigned int namelen;
2221 int ret = -EINVAL;
2222 u8 node;
2223 unsigned int hash;
2224 struct dlm_work_item *item;
2225 int cleared = 0;
2226 int dispatch = 0;
2227
2228 if (!dlm_grab(dlm))
2229 return 0;
2230
2231 name = deref->name;
2232 namelen = deref->namelen;
2233 node = deref->node_idx;
2234
2235 if (namelen > DLM_LOCKID_NAME_MAX) {
2236 mlog(ML_ERROR, "Invalid name length!");
2237 goto done;
2238 }
2239 if (deref->node_idx >= O2NM_MAX_NODES) {
2240 mlog(ML_ERROR, "Invalid node number: %u\n", node);
2241 goto done;
2242 }
2243
2244 hash = dlm_lockid_hash(name, namelen);
2245
2246 spin_lock(&dlm->spinlock);
2247 res = __dlm_lookup_lockres_full(dlm, name, namelen, hash);
2248 if (!res) {
2249 spin_unlock(&dlm->spinlock);
2250 mlog(ML_ERROR, "%s:%.*s: bad lockres name\n",
2251 dlm->name, namelen, name);
2252 goto done;
2253 }
2254 spin_unlock(&dlm->spinlock);
2255
2256 spin_lock(&res->spinlock);
2257 if (res->state & DLM_LOCK_RES_SETREF_INPROG)
2258 dispatch = 1;
2259 else {
2260 BUG_ON(res->state & DLM_LOCK_RES_DROPPING_REF);
2261 if (test_bit(node, res->refmap)) {
2262 dlm_lockres_clear_refmap_bit(dlm, res, node);
2263 cleared = 1;
2264 }
2265 }
2266 spin_unlock(&res->spinlock);
2267
2268 if (!dispatch) {
2269 if (cleared)
2270 dlm_lockres_calc_usage(dlm, res);
2271 else {
2272 mlog(ML_ERROR, "%s:%.*s: node %u trying to drop ref "
2273 "but it is already dropped!\n", dlm->name,
2274 res->lockname.len, res->lockname.name, node);
2275 dlm_print_one_lock_resource(res);
2276 }
2277 ret = 0;
2278 goto done;
2279 }
2280
2281 item = kzalloc(sizeof(*item), GFP_NOFS);
2282 if (!item) {
2283 ret = -ENOMEM;
2284 mlog_errno(ret);
2285 goto done;
2286 }
2287
2288 dlm_init_work_item(dlm, item, dlm_deref_lockres_worker, NULL);
2289 item->u.dl.deref_res = res;
2290 item->u.dl.deref_node = node;
2291
2292 spin_lock(&dlm->work_lock);
2293 list_add_tail(&item->list, &dlm->work_list);
2294 spin_unlock(&dlm->work_lock);
2295
2296 queue_work(dlm->dlm_worker, &dlm->dispatched_work);
2297 return 0;
2298
2299done:
2300 if (res)
2301 dlm_lockres_put(res);
2302 dlm_put(dlm);
2303
2304 return ret;
2305}
2306
2307static void dlm_deref_lockres_worker(struct dlm_work_item *item, void *data)
2308{
2309 struct dlm_ctxt *dlm;
2310 struct dlm_lock_resource *res;
2311 u8 node;
2312 u8 cleared = 0;
2313
2314 dlm = item->dlm;
2315 res = item->u.dl.deref_res;
2316 node = item->u.dl.deref_node;
2317
2318 spin_lock(&res->spinlock);
2319 BUG_ON(res->state & DLM_LOCK_RES_DROPPING_REF);
2320 if (test_bit(node, res->refmap)) {
2321 __dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_SETREF_INPROG);
2322 dlm_lockres_clear_refmap_bit(dlm, res, node);
2323 cleared = 1;
2324 }
2325 spin_unlock(&res->spinlock);
2326
2327 if (cleared) {
2328 mlog(0, "%s:%.*s node %u ref dropped in dispatch\n",
2329 dlm->name, res->lockname.len, res->lockname.name, node);
2330 dlm_lockres_calc_usage(dlm, res);
2331 } else {
2332 mlog(ML_ERROR, "%s:%.*s: node %u trying to drop ref "
2333 "but it is already dropped!\n", dlm->name,
2334 res->lockname.len, res->lockname.name, node);
2335 dlm_print_one_lock_resource(res);
2336 }
2337
2338 dlm_lockres_put(res);
2339}
2340
2341
2342
2343
2344
2345
2346
2347
2348static int dlm_is_lockres_migrateable(struct dlm_ctxt *dlm,
2349 struct dlm_lock_resource *res)
2350{
2351 enum dlm_lockres_list idx;
2352 int nonlocal = 0, node_ref;
2353 struct list_head *queue;
2354 struct dlm_lock *lock;
2355 u64 cookie;
2356
2357 assert_spin_locked(&res->spinlock);
2358
2359
2360 if (res->state & DLM_LOCK_RES_MIGRATING)
2361 return 0;
2362
2363 if (res->owner != dlm->node_num)
2364 return 0;
2365
2366 for (idx = DLM_GRANTED_LIST; idx <= DLM_BLOCKED_LIST; idx++) {
2367 queue = dlm_list_idx_to_ptr(res, idx);
2368 list_for_each_entry(lock, queue, list) {
2369 if (lock->ml.node != dlm->node_num) {
2370 nonlocal++;
2371 continue;
2372 }
2373 cookie = be64_to_cpu(lock->ml.cookie);
2374 mlog(0, "%s: Not migrateable res %.*s, lock %u:%llu on "
2375 "%s list\n", dlm->name, res->lockname.len,
2376 res->lockname.name,
2377 dlm_get_lock_cookie_node(cookie),
2378 dlm_get_lock_cookie_seq(cookie),
2379 dlm_list_in_text(idx));
2380 return 0;
2381 }
2382 }
2383
2384 if (!nonlocal) {
2385 node_ref = find_next_bit(res->refmap, O2NM_MAX_NODES, 0);
2386 if (node_ref >= O2NM_MAX_NODES)
2387 return 0;
2388 }
2389
2390 mlog(0, "%s: res %.*s, Migrateable\n", dlm->name, res->lockname.len,
2391 res->lockname.name);
2392
2393 return 1;
2394}
2395
2396
2397
2398
2399
2400
2401static int dlm_migrate_lockres(struct dlm_ctxt *dlm,
2402 struct dlm_lock_resource *res, u8 target)
2403{
2404 struct dlm_master_list_entry *mle = NULL;
2405 struct dlm_master_list_entry *oldmle = NULL;
2406 struct dlm_migratable_lockres *mres = NULL;
2407 int ret = 0;
2408 const char *name;
2409 unsigned int namelen;
2410 int mle_added = 0;
2411 int wake = 0;
2412
2413 if (!dlm_grab(dlm))
2414 return -EINVAL;
2415
2416 BUG_ON(target == O2NM_MAX_NODES);
2417
2418 name = res->lockname.name;
2419 namelen = res->lockname.len;
2420
2421 mlog(0, "%s: Migrating %.*s to node %u\n", dlm->name, namelen, name,
2422 target);
2423
2424
2425 ret = -ENOMEM;
2426 mres = (struct dlm_migratable_lockres *) __get_free_page(GFP_NOFS);
2427 if (!mres) {
2428 mlog_errno(ret);
2429 goto leave;
2430 }
2431
2432 mle = kmem_cache_alloc(dlm_mle_cache, GFP_NOFS);
2433 if (!mle) {
2434 mlog_errno(ret);
2435 goto leave;
2436 }
2437 ret = 0;
2438
2439
2440
2441
2442
2443 spin_lock(&dlm->spinlock);
2444 spin_lock(&dlm->master_lock);
2445 ret = dlm_add_migration_mle(dlm, res, mle, &oldmle, name,
2446 namelen, target, dlm->node_num);
2447 spin_unlock(&dlm->master_lock);
2448 spin_unlock(&dlm->spinlock);
2449
2450 if (ret == -EEXIST) {
2451 mlog(0, "another process is already migrating it\n");
2452 goto fail;
2453 }
2454 mle_added = 1;
2455
2456
2457
2458
2459
2460 if (dlm_mark_lockres_migrating(dlm, res, target) < 0) {
2461 mlog(ML_ERROR, "tried to migrate %.*s to %u, but "
2462 "the target went down.\n", res->lockname.len,
2463 res->lockname.name, target);
2464 spin_lock(&res->spinlock);
2465 res->state &= ~DLM_LOCK_RES_MIGRATING;
2466 wake = 1;
2467 spin_unlock(&res->spinlock);
2468 ret = -EINVAL;
2469 }
2470
2471fail:
2472 if (oldmle) {
2473
2474 dlm_mle_detach_hb_events(dlm, oldmle);
2475 dlm_put_mle(oldmle);
2476 }
2477
2478 if (ret < 0) {
2479 if (mle_added) {
2480 dlm_mle_detach_hb_events(dlm, mle);
2481 dlm_put_mle(mle);
2482 } else if (mle) {
2483 kmem_cache_free(dlm_mle_cache, mle);
2484 mle = NULL;
2485 }
2486 goto leave;
2487 }
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497 flush_workqueue(dlm->dlm_worker);
2498
2499
2500
2501
2502
2503
2504 spin_lock(&dlm->spinlock);
2505 spin_lock(&dlm->master_lock);
2506 dlm_get_mle_inuse(mle);
2507 spin_unlock(&dlm->master_lock);
2508 spin_unlock(&dlm->spinlock);
2509
2510
2511
2512
2513
2514 ret = dlm_send_one_lockres(dlm, res, mres, target,
2515 DLM_MRES_MIGRATION);
2516
2517 if (ret < 0) {
2518 mlog(0, "migration to node %u failed with %d\n",
2519 target, ret);
2520
2521 dlm_mle_detach_hb_events(dlm, mle);
2522 dlm_put_mle(mle);
2523 dlm_put_mle_inuse(mle);
2524 spin_lock(&res->spinlock);
2525 res->state &= ~DLM_LOCK_RES_MIGRATING;
2526 wake = 1;
2527 spin_unlock(&res->spinlock);
2528 if (dlm_is_host_down(ret))
2529 dlm_wait_for_node_death(dlm, target,
2530 DLM_NODE_DEATH_WAIT_MAX);
2531 goto leave;
2532 }
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546 while (1) {
2547 ret = wait_event_interruptible_timeout(mle->wq,
2548 (atomic_read(&mle->woken) == 1),
2549 msecs_to_jiffies(5000));
2550
2551 if (ret >= 0) {
2552 if (atomic_read(&mle->woken) == 1 ||
2553 res->owner == target)
2554 break;
2555
2556 mlog(0, "%s:%.*s: timed out during migration\n",
2557 dlm->name, res->lockname.len, res->lockname.name);
2558
2559
2560 if (dlm_is_node_dead(dlm, target)) {
2561 mlog(0, "%s:%.*s: expected migration "
2562 "target %u is no longer up, restarting\n",
2563 dlm->name, res->lockname.len,
2564 res->lockname.name, target);
2565 ret = -EINVAL;
2566
2567 dlm_mle_detach_hb_events(dlm, mle);
2568 dlm_put_mle(mle);
2569 dlm_put_mle_inuse(mle);
2570 spin_lock(&res->spinlock);
2571 res->state &= ~DLM_LOCK_RES_MIGRATING;
2572 wake = 1;
2573 spin_unlock(&res->spinlock);
2574 goto leave;
2575 }
2576 } else
2577 mlog(0, "%s:%.*s: caught signal during migration\n",
2578 dlm->name, res->lockname.len, res->lockname.name);
2579 }
2580
2581
2582 spin_lock(&res->spinlock);
2583 dlm_set_lockres_owner(dlm, res, target);
2584 res->state &= ~DLM_LOCK_RES_MIGRATING;
2585 dlm_remove_nonlocal_locks(dlm, res);
2586 spin_unlock(&res->spinlock);
2587 wake_up(&res->wq);
2588
2589
2590 dlm_mle_detach_hb_events(dlm, mle);
2591 dlm_put_mle_inuse(mle);
2592 ret = 0;
2593
2594 dlm_lockres_calc_usage(dlm, res);
2595
2596leave:
2597
2598 if (ret < 0)
2599 dlm_kick_thread(dlm, res);
2600
2601
2602
2603 if (wake)
2604 wake_up(&res->wq);
2605
2606 if (mres)
2607 free_page((unsigned long)mres);
2608
2609 dlm_put(dlm);
2610
2611 mlog(0, "%s: Migrating %.*s to %u, returns %d\n", dlm->name, namelen,
2612 name, target, ret);
2613 return ret;
2614}
2615
2616#define DLM_MIGRATION_RETRY_MS 100
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628int dlm_empty_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
2629{
2630 int ret;
2631 int lock_dropped = 0;
2632 u8 target = O2NM_MAX_NODES;
2633
2634 assert_spin_locked(&dlm->spinlock);
2635
2636 spin_lock(&res->spinlock);
2637 if (dlm_is_lockres_migrateable(dlm, res))
2638 target = dlm_pick_migration_target(dlm, res);
2639 spin_unlock(&res->spinlock);
2640
2641 if (target == O2NM_MAX_NODES)
2642 goto leave;
2643
2644
2645 spin_unlock(&dlm->spinlock);
2646 lock_dropped = 1;
2647 ret = dlm_migrate_lockres(dlm, res, target);
2648 if (ret)
2649 mlog(0, "%s: res %.*s, Migrate to node %u failed with %d\n",
2650 dlm->name, res->lockname.len, res->lockname.name,
2651 target, ret);
2652 spin_lock(&dlm->spinlock);
2653leave:
2654 return lock_dropped;
2655}
2656
2657int dlm_lock_basts_flushed(struct dlm_ctxt *dlm, struct dlm_lock *lock)
2658{
2659 int ret;
2660 spin_lock(&dlm->ast_lock);
2661 spin_lock(&lock->spinlock);
2662 ret = (list_empty(&lock->bast_list) && !lock->bast_pending);
2663 spin_unlock(&lock->spinlock);
2664 spin_unlock(&dlm->ast_lock);
2665 return ret;
2666}
2667
2668static int dlm_migration_can_proceed(struct dlm_ctxt *dlm,
2669 struct dlm_lock_resource *res,
2670 u8 mig_target)
2671{
2672 int can_proceed;
2673 spin_lock(&res->spinlock);
2674 can_proceed = !!(res->state & DLM_LOCK_RES_MIGRATING);
2675 spin_unlock(&res->spinlock);
2676
2677
2678
2679 spin_lock(&dlm->spinlock);
2680 if (!test_bit(mig_target, dlm->domain_map))
2681 can_proceed = 1;
2682 spin_unlock(&dlm->spinlock);
2683 return can_proceed;
2684}
2685
2686static int dlm_lockres_is_dirty(struct dlm_ctxt *dlm,
2687 struct dlm_lock_resource *res)
2688{
2689 int ret;
2690 spin_lock(&res->spinlock);
2691 ret = !!(res->state & DLM_LOCK_RES_DIRTY);
2692 spin_unlock(&res->spinlock);
2693 return ret;
2694}
2695
2696
2697static int dlm_mark_lockres_migrating(struct dlm_ctxt *dlm,
2698 struct dlm_lock_resource *res,
2699 u8 target)
2700{
2701 int ret = 0;
2702
2703 mlog(0, "dlm_mark_lockres_migrating: %.*s, from %u to %u\n",
2704 res->lockname.len, res->lockname.name, dlm->node_num,
2705 target);
2706
2707
2708 spin_lock(&res->spinlock);
2709 BUG_ON(res->migration_pending);
2710 res->migration_pending = 1;
2711
2712
2713 __dlm_lockres_reserve_ast(res);
2714 spin_unlock(&res->spinlock);
2715
2716
2717 dlm_kick_thread(dlm, res);
2718
2719
2720 spin_lock(&res->spinlock);
2721 BUG_ON(res->state & DLM_LOCK_RES_BLOCK_DIRTY);
2722 res->state |= DLM_LOCK_RES_BLOCK_DIRTY;
2723 spin_unlock(&res->spinlock);
2724
2725 wait_event(dlm->ast_wq, !dlm_lockres_is_dirty(dlm, res));
2726 dlm_lockres_release_ast(dlm, res);
2727
2728 mlog(0, "about to wait on migration_wq, dirty=%s\n",
2729 res->state & DLM_LOCK_RES_DIRTY ? "yes" : "no");
2730
2731
2732
2733again:
2734 ret = wait_event_interruptible_timeout(dlm->migration_wq,
2735 dlm_migration_can_proceed(dlm, res, target),
2736 msecs_to_jiffies(1000));
2737 if (ret < 0) {
2738 mlog(0, "woken again: migrating? %s, dead? %s\n",
2739 res->state & DLM_LOCK_RES_MIGRATING ? "yes":"no",
2740 test_bit(target, dlm->domain_map) ? "no":"yes");
2741 } else {
2742 mlog(0, "all is well: migrating? %s, dead? %s\n",
2743 res->state & DLM_LOCK_RES_MIGRATING ? "yes":"no",
2744 test_bit(target, dlm->domain_map) ? "no":"yes");
2745 }
2746 if (!dlm_migration_can_proceed(dlm, res, target)) {
2747 mlog(0, "trying again...\n");
2748 goto again;
2749 }
2750
2751 ret = 0;
2752
2753 spin_lock(&dlm->spinlock);
2754 if (!test_bit(target, dlm->domain_map)) {
2755 mlog(ML_ERROR, "aha. migration target %u just went down\n",
2756 target);
2757 ret = -EHOSTDOWN;
2758 }
2759 spin_unlock(&dlm->spinlock);
2760
2761
2762
2763
2764
2765
2766 spin_lock(&res->spinlock);
2767 BUG_ON(!(res->state & DLM_LOCK_RES_BLOCK_DIRTY));
2768 res->state &= ~DLM_LOCK_RES_BLOCK_DIRTY;
2769 if (!ret)
2770 BUG_ON(!(res->state & DLM_LOCK_RES_MIGRATING));
2771 spin_unlock(&res->spinlock);
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781 return ret;
2782}
2783
2784
2785
2786
2787static void dlm_remove_nonlocal_locks(struct dlm_ctxt *dlm,
2788 struct dlm_lock_resource *res)
2789{
2790 struct list_head *queue = &res->granted;
2791 int i, bit;
2792 struct dlm_lock *lock, *next;
2793
2794 assert_spin_locked(&res->spinlock);
2795
2796 BUG_ON(res->owner == dlm->node_num);
2797
2798 for (i=0; i<3; i++) {
2799 list_for_each_entry_safe(lock, next, queue, list) {
2800 if (lock->ml.node != dlm->node_num) {
2801 mlog(0, "putting lock for node %u\n",
2802 lock->ml.node);
2803
2804 BUG_ON(!list_empty(&lock->ast_list));
2805 BUG_ON(!list_empty(&lock->bast_list));
2806 BUG_ON(lock->ast_pending);
2807 BUG_ON(lock->bast_pending);
2808 dlm_lockres_clear_refmap_bit(dlm, res,
2809 lock->ml.node);
2810 list_del_init(&lock->list);
2811 dlm_lock_put(lock);
2812
2813
2814 dlm_lock_put(lock);
2815 }
2816 }
2817 queue++;
2818 }
2819 bit = 0;
2820 while (1) {
2821 bit = find_next_bit(res->refmap, O2NM_MAX_NODES, bit);
2822 if (bit >= O2NM_MAX_NODES)
2823 break;
2824
2825
2826 if (bit != dlm->node_num) {
2827 mlog(0, "%s:%.*s: node %u had a ref to this "
2828 "migrating lockres, clearing\n", dlm->name,
2829 res->lockname.len, res->lockname.name, bit);
2830 dlm_lockres_clear_refmap_bit(dlm, res, bit);
2831 }
2832 bit++;
2833 }
2834}
2835
2836
2837
2838
2839
2840
2841static u8 dlm_pick_migration_target(struct dlm_ctxt *dlm,
2842 struct dlm_lock_resource *res)
2843{
2844 enum dlm_lockres_list idx;
2845 struct list_head *queue = &res->granted;
2846 struct dlm_lock *lock;
2847 int noderef;
2848 u8 nodenum = O2NM_MAX_NODES;
2849
2850 assert_spin_locked(&dlm->spinlock);
2851 assert_spin_locked(&res->spinlock);
2852
2853
2854 for (idx = DLM_GRANTED_LIST; idx <= DLM_BLOCKED_LIST; idx++) {
2855 queue = dlm_list_idx_to_ptr(res, idx);
2856 list_for_each_entry(lock, queue, list) {
2857 if (lock->ml.node == dlm->node_num)
2858 continue;
2859 if (test_bit(lock->ml.node, dlm->exit_domain_map))
2860 continue;
2861 nodenum = lock->ml.node;
2862 goto bail;
2863 }
2864 }
2865
2866
2867 noderef = -1;
2868 while (1) {
2869 noderef = find_next_bit(res->refmap, O2NM_MAX_NODES,
2870 noderef + 1);
2871 if (noderef >= O2NM_MAX_NODES)
2872 break;
2873 if (noderef == dlm->node_num)
2874 continue;
2875 if (test_bit(noderef, dlm->exit_domain_map))
2876 continue;
2877 nodenum = noderef;
2878 goto bail;
2879 }
2880
2881bail:
2882 return nodenum;
2883}
2884
2885
2886
2887static int dlm_do_migrate_request(struct dlm_ctxt *dlm,
2888 struct dlm_lock_resource *res,
2889 u8 master, u8 new_master,
2890 struct dlm_node_iter *iter)
2891{
2892 struct dlm_migrate_request migrate;
2893 int ret, skip, status = 0;
2894 int nodenum;
2895
2896 memset(&migrate, 0, sizeof(migrate));
2897 migrate.namelen = res->lockname.len;
2898 memcpy(migrate.name, res->lockname.name, migrate.namelen);
2899 migrate.new_master = new_master;
2900 migrate.master = master;
2901
2902 ret = 0;
2903
2904
2905 while ((nodenum = dlm_node_iter_next(iter)) >= 0) {
2906 if (nodenum == master ||
2907 nodenum == new_master)
2908 continue;
2909
2910
2911 spin_lock(&dlm->spinlock);
2912 skip = (!test_bit(nodenum, dlm->domain_map));
2913 spin_unlock(&dlm->spinlock);
2914 if (skip) {
2915 clear_bit(nodenum, iter->node_map);
2916 continue;
2917 }
2918
2919 ret = o2net_send_message(DLM_MIGRATE_REQUEST_MSG, dlm->key,
2920 &migrate, sizeof(migrate), nodenum,
2921 &status);
2922 if (ret < 0) {
2923 mlog(ML_ERROR, "%s: res %.*s, Error %d send "
2924 "MIGRATE_REQUEST to node %u\n", dlm->name,
2925 migrate.namelen, migrate.name, ret, nodenum);
2926 if (!dlm_is_host_down(ret)) {
2927 mlog(ML_ERROR, "unhandled error=%d!\n", ret);
2928 BUG();
2929 }
2930 clear_bit(nodenum, iter->node_map);
2931 ret = 0;
2932 } else if (status < 0) {
2933 mlog(0, "migrate request (node %u) returned %d!\n",
2934 nodenum, status);
2935 ret = status;
2936 } else if (status == DLM_MIGRATE_RESPONSE_MASTERY_REF) {
2937
2938
2939
2940 mlog(0, "%s:%.*s: need ref for node %u\n",
2941 dlm->name, res->lockname.len, res->lockname.name,
2942 nodenum);
2943 spin_lock(&res->spinlock);
2944 dlm_lockres_set_refmap_bit(dlm, res, nodenum);
2945 spin_unlock(&res->spinlock);
2946 }
2947 }
2948
2949 if (ret < 0)
2950 mlog_errno(ret);
2951
2952 mlog(0, "returning ret=%d\n", ret);
2953 return ret;
2954}
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964int dlm_migrate_request_handler(struct o2net_msg *msg, u32 len, void *data,
2965 void **ret_data)
2966{
2967 struct dlm_ctxt *dlm = data;
2968 struct dlm_lock_resource *res = NULL;
2969 struct dlm_migrate_request *migrate = (struct dlm_migrate_request *) msg->buf;
2970 struct dlm_master_list_entry *mle = NULL, *oldmle = NULL;
2971 const char *name;
2972 unsigned int namelen, hash;
2973 int ret = 0;
2974
2975 if (!dlm_grab(dlm))
2976 return -EINVAL;
2977
2978 name = migrate->name;
2979 namelen = migrate->namelen;
2980 hash = dlm_lockid_hash(name, namelen);
2981
2982
2983 mle = kmem_cache_alloc(dlm_mle_cache, GFP_NOFS);
2984
2985 if (!mle) {
2986 ret = -ENOMEM;
2987 goto leave;
2988 }
2989
2990
2991 spin_lock(&dlm->spinlock);
2992 res = __dlm_lookup_lockres(dlm, name, namelen, hash);
2993 if (res) {
2994 spin_lock(&res->spinlock);
2995 if (res->state & DLM_LOCK_RES_RECOVERING) {
2996
2997
2998
2999 spin_unlock(&res->spinlock);
3000 mlog(ML_ERROR, "Got a migrate request, but the "
3001 "lockres is marked as recovering!");
3002 kmem_cache_free(dlm_mle_cache, mle);
3003 ret = -EINVAL;
3004 goto unlock;
3005 }
3006 res->state |= DLM_LOCK_RES_MIGRATING;
3007 spin_unlock(&res->spinlock);
3008 }
3009
3010 spin_lock(&dlm->master_lock);
3011
3012 ret = dlm_add_migration_mle(dlm, res, mle, &oldmle,
3013 name, namelen,
3014 migrate->new_master,
3015 migrate->master);
3016
3017 spin_unlock(&dlm->master_lock);
3018unlock:
3019 spin_unlock(&dlm->spinlock);
3020
3021 if (oldmle) {
3022
3023 dlm_mle_detach_hb_events(dlm, oldmle);
3024 dlm_put_mle(oldmle);
3025 }
3026
3027 if (res)
3028 dlm_lockres_put(res);
3029leave:
3030 dlm_put(dlm);
3031 return ret;
3032}
3033
3034
3035
3036
3037
3038
3039
3040
3041static int dlm_add_migration_mle(struct dlm_ctxt *dlm,
3042 struct dlm_lock_resource *res,
3043 struct dlm_master_list_entry *mle,
3044 struct dlm_master_list_entry **oldmle,
3045 const char *name, unsigned int namelen,
3046 u8 new_master, u8 master)
3047{
3048 int found;
3049 int ret = 0;
3050
3051 *oldmle = NULL;
3052
3053 assert_spin_locked(&dlm->spinlock);
3054 assert_spin_locked(&dlm->master_lock);
3055
3056
3057 found = dlm_find_mle(dlm, oldmle, (char *)name, namelen);
3058 if (found) {
3059 struct dlm_master_list_entry *tmp = *oldmle;
3060 spin_lock(&tmp->spinlock);
3061 if (tmp->type == DLM_MLE_MIGRATION) {
3062 if (master == dlm->node_num) {
3063
3064 mlog(0, "tried to migrate %.*s, but some "
3065 "process beat me to it\n",
3066 namelen, name);
3067 ret = -EEXIST;
3068 } else {
3069
3070 mlog(ML_ERROR, "migration error mle: "
3071 "master=%u new_master=%u // request: "
3072 "master=%u new_master=%u // "
3073 "lockres=%.*s\n",
3074 tmp->master, tmp->new_master,
3075 master, new_master,
3076 namelen, name);
3077 BUG();
3078 }
3079 } else {
3080
3081 tmp->master = master;
3082 atomic_set(&tmp->woken, 1);
3083 wake_up(&tmp->wq);
3084
3085 __dlm_unlink_mle(dlm, tmp);
3086 __dlm_mle_detach_hb_events(dlm, tmp);
3087 ret = DLM_MIGRATE_RESPONSE_MASTERY_REF;
3088 mlog(0, "%s:%.*s: master=%u, newmaster=%u, "
3089 "telling master to get ref for cleared out mle "
3090 "during migration\n", dlm->name, namelen, name,
3091 master, new_master);
3092 }
3093 spin_unlock(&tmp->spinlock);
3094 }
3095
3096
3097 dlm_init_mle(mle, DLM_MLE_MIGRATION, dlm, res, name, namelen);
3098 mle->new_master = new_master;
3099
3100
3101 mle->master = master;
3102
3103 set_bit(new_master, mle->maybe_map);
3104 __dlm_insert_mle(dlm, mle);
3105
3106 return ret;
3107}
3108
3109
3110
3111
3112static struct dlm_lock_resource *dlm_reset_mleres_owner(struct dlm_ctxt *dlm,
3113 struct dlm_master_list_entry *mle)
3114{
3115 struct dlm_lock_resource *res;
3116
3117
3118 res = __dlm_lookup_lockres(dlm, mle->mname, mle->mnamelen,
3119 mle->mnamehash);
3120 if (res) {
3121 spin_unlock(&dlm->master_lock);
3122
3123
3124 spin_lock(&res->spinlock);
3125 dlm_set_lockres_owner(dlm, res, DLM_LOCK_RES_OWNER_UNKNOWN);
3126 dlm_move_lockres_to_recovery_list(dlm, res);
3127 spin_unlock(&res->spinlock);
3128 dlm_lockres_put(res);
3129
3130
3131 __dlm_mle_detach_hb_events(dlm, mle);
3132
3133
3134 spin_lock(&dlm->master_lock);
3135 __dlm_put_mle(mle);
3136 spin_unlock(&dlm->master_lock);
3137 }
3138
3139 return res;
3140}
3141
3142static void dlm_clean_migration_mle(struct dlm_ctxt *dlm,
3143 struct dlm_master_list_entry *mle)
3144{
3145 __dlm_mle_detach_hb_events(dlm, mle);
3146
3147 spin_lock(&mle->spinlock);
3148 __dlm_unlink_mle(dlm, mle);
3149 atomic_set(&mle->woken, 1);
3150 spin_unlock(&mle->spinlock);
3151
3152 wake_up(&mle->wq);
3153}
3154
3155static void dlm_clean_block_mle(struct dlm_ctxt *dlm,
3156 struct dlm_master_list_entry *mle, u8 dead_node)
3157{
3158 int bit;
3159
3160 BUG_ON(mle->type != DLM_MLE_BLOCK);
3161
3162 spin_lock(&mle->spinlock);
3163 bit = find_next_bit(mle->maybe_map, O2NM_MAX_NODES, 0);
3164 if (bit != dead_node) {
3165 mlog(0, "mle found, but dead node %u would not have been "
3166 "master\n", dead_node);
3167 spin_unlock(&mle->spinlock);
3168 } else {
3169
3170
3171
3172
3173 mlog(0, "node %u was expected master\n", dead_node);
3174 atomic_set(&mle->woken, 1);
3175 spin_unlock(&mle->spinlock);
3176 wake_up(&mle->wq);
3177
3178
3179 __dlm_mle_detach_hb_events(dlm, mle);
3180 __dlm_put_mle(mle);
3181 }
3182}
3183
3184void dlm_clean_master_list(struct dlm_ctxt *dlm, u8 dead_node)
3185{
3186 struct dlm_master_list_entry *mle;
3187 struct dlm_lock_resource *res;
3188 struct hlist_head *bucket;
3189 struct hlist_node *tmp;
3190 unsigned int i;
3191
3192 mlog(0, "dlm=%s, dead node=%u\n", dlm->name, dead_node);
3193top:
3194 assert_spin_locked(&dlm->spinlock);
3195
3196
3197 spin_lock(&dlm->master_lock);
3198 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
3199 bucket = dlm_master_hash(dlm, i);
3200 hlist_for_each_entry_safe(mle, tmp, bucket, master_hash_node) {
3201 BUG_ON(mle->type != DLM_MLE_BLOCK &&
3202 mle->type != DLM_MLE_MASTER &&
3203 mle->type != DLM_MLE_MIGRATION);
3204
3205
3206
3207
3208 if (mle->type == DLM_MLE_MASTER)
3209 continue;
3210
3211
3212
3213
3214 if (mle->type == DLM_MLE_BLOCK) {
3215 dlm_clean_block_mle(dlm, mle, dead_node);
3216 continue;
3217 }
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230 if (mle->master != dead_node &&
3231 mle->new_master != dead_node)
3232 continue;
3233
3234
3235
3236 dlm_clean_migration_mle(dlm, mle);
3237
3238 mlog(0, "%s: node %u died during migration from "
3239 "%u to %u!\n", dlm->name, dead_node, mle->master,
3240 mle->new_master);
3241
3242
3243
3244
3245
3246
3247 res = dlm_reset_mleres_owner(dlm, mle);
3248 if (res)
3249
3250 goto top;
3251
3252
3253 __dlm_put_mle(mle);
3254 }
3255 }
3256 spin_unlock(&dlm->master_lock);
3257}
3258
3259int dlm_finish_migration(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
3260 u8 old_master)
3261{
3262 struct dlm_node_iter iter;
3263 int ret = 0;
3264
3265 spin_lock(&dlm->spinlock);
3266 dlm_node_iter_init(dlm->domain_map, &iter);
3267 clear_bit(old_master, iter.node_map);
3268 clear_bit(dlm->node_num, iter.node_map);
3269 spin_unlock(&dlm->spinlock);
3270
3271
3272
3273
3274 spin_lock(&res->spinlock);
3275 dlm_lockres_set_refmap_bit(dlm, res, old_master);
3276 spin_unlock(&res->spinlock);
3277
3278 mlog(0, "now time to do a migrate request to other nodes\n");
3279 ret = dlm_do_migrate_request(dlm, res, old_master,
3280 dlm->node_num, &iter);
3281 if (ret < 0) {
3282 mlog_errno(ret);
3283 goto leave;
3284 }
3285
3286 mlog(0, "doing assert master of %.*s to all except the original node\n",
3287 res->lockname.len, res->lockname.name);
3288
3289
3290 ret = dlm_do_assert_master(dlm, res, iter.node_map,
3291 DLM_ASSERT_MASTER_FINISH_MIGRATION);
3292 if (ret < 0) {
3293
3294 mlog_errno(ret);
3295 ret = 0;
3296 }
3297
3298 memset(iter.node_map, 0, sizeof(iter.node_map));
3299 set_bit(old_master, iter.node_map);
3300 mlog(0, "doing assert master of %.*s back to %u\n",
3301 res->lockname.len, res->lockname.name, old_master);
3302 ret = dlm_do_assert_master(dlm, res, iter.node_map,
3303 DLM_ASSERT_MASTER_FINISH_MIGRATION);
3304 if (ret < 0) {
3305 mlog(0, "assert master to original master failed "
3306 "with %d.\n", ret);
3307
3308
3309 ret = 0;
3310 }
3311
3312
3313 spin_lock(&res->spinlock);
3314 dlm_set_lockres_owner(dlm, res, dlm->node_num);
3315 res->state &= ~DLM_LOCK_RES_MIGRATING;
3316 spin_unlock(&res->spinlock);
3317
3318 dlm_kick_thread(dlm, res);
3319 wake_up(&res->wq);
3320leave:
3321 return ret;
3322}
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333void __dlm_lockres_reserve_ast(struct dlm_lock_resource *res)
3334{
3335 assert_spin_locked(&res->spinlock);
3336 if (res->state & DLM_LOCK_RES_MIGRATING) {
3337 __dlm_print_one_lock_resource(res);
3338 }
3339 BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
3340
3341 atomic_inc(&res->asts_reserved);
3342}
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357void dlm_lockres_release_ast(struct dlm_ctxt *dlm,
3358 struct dlm_lock_resource *res)
3359{
3360 if (!atomic_dec_and_lock(&res->asts_reserved, &res->spinlock))
3361 return;
3362
3363 if (!res->migration_pending) {
3364 spin_unlock(&res->spinlock);
3365 return;
3366 }
3367
3368 BUG_ON(res->state & DLM_LOCK_RES_MIGRATING);
3369 res->migration_pending = 0;
3370 res->state |= DLM_LOCK_RES_MIGRATING;
3371 spin_unlock(&res->spinlock);
3372 wake_up(&res->wq);
3373 wake_up(&dlm->migration_wq);
3374}
3375
3376void dlm_force_free_mles(struct dlm_ctxt *dlm)
3377{
3378 int i;
3379 struct hlist_head *bucket;
3380 struct dlm_master_list_entry *mle;
3381 struct hlist_node *tmp;
3382
3383
3384
3385
3386
3387
3388
3389 spin_lock(&dlm->spinlock);
3390 spin_lock(&dlm->master_lock);
3391
3392 BUG_ON(dlm->dlm_state != DLM_CTXT_LEAVING);
3393 BUG_ON((find_next_bit(dlm->domain_map, O2NM_MAX_NODES, 0) < O2NM_MAX_NODES));
3394
3395 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
3396 bucket = dlm_master_hash(dlm, i);
3397 hlist_for_each_entry_safe(mle, tmp, bucket, master_hash_node) {
3398 if (mle->type != DLM_MLE_BLOCK) {
3399 mlog(ML_ERROR, "bad mle: %p\n", mle);
3400 dlm_print_one_mle(mle);
3401 }
3402 atomic_set(&mle->woken, 1);
3403 wake_up(&mle->wq);
3404
3405 __dlm_unlink_mle(dlm, mle);
3406 __dlm_mle_detach_hb_events(dlm, mle);
3407 __dlm_put_mle(mle);
3408 }
3409 }
3410 spin_unlock(&dlm->master_lock);
3411 spin_unlock(&dlm->spinlock);
3412}
3413