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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / fs / ocfs2 / dlm / dlmdomain.c
blob7540a492eaba0188d624a08f73688eee04838288
1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmdomain.c
5 *
6 * defines domain join / leave apis
7 *
8 * Copyright (C) 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 *
25 */
26
27 #include <linux/module.h>
28 #include <linux/types.h>
29 #include <linux/slab.h>
30 #include <linux/highmem.h>
31 #include <linux/init.h>
32 #include <linux/spinlock.h>
33 #include <linux/delay.h>
34 #include <linux/err.h>
35 #include <linux/debugfs.h>
36
37 #include "cluster/heartbeat.h"
38 #include "cluster/nodemanager.h"
39 #include "cluster/tcp.h"
40
41 #include "dlmapi.h"
42 #include "dlmcommon.h"
43 #include "dlmdomain.h"
44 #include "dlmdebug.h"
45
46 #include "dlmver.h"
47
48 #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
49 #include "cluster/masklog.h"
50
51 /*
52 * ocfs2 node maps are array of long int, which limits to send them freely
53 * across the wire due to endianness issues. To workaround this, we convert
54 * long ints to byte arrays. Following 3 routines are helper functions to
55 * set/test/copy bits within those array of bytes
56 */
57 static inline void byte_set_bit(u8 nr, u8 map[])
58 {
59 map[nr >> 3] |= (1UL << (nr & 7));
60 }
61
62 static inline int byte_test_bit(u8 nr, u8 map[])
63 {
64 return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0;
65 }
66
67 static inline void byte_copymap(u8 dmap[], unsigned long smap[],
68 unsigned int sz)
69 {
70 unsigned int nn;
71
72 if (!sz)
73 return;
74
75 memset(dmap, 0, ((sz + 7) >> 3));
76 for (nn = 0 ; nn < sz; nn++)
77 if (test_bit(nn, smap))
78 byte_set_bit(nn, dmap);
79 }
80
81 static void dlm_free_pagevec(void **vec, int pages)
82 {
83 while (pages--)
84 free_page((unsigned long)vec[pages]);
85 kfree(vec);
86 }
87
88 static void **dlm_alloc_pagevec(int pages)
89 {
90 void **vec = kmalloc(pages * sizeof(void *), GFP_KERNEL);
91 int i;
92
93 if (!vec)
94 return NULL;
95
96 for (i = 0; i < pages; i++)
97 if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
98 goto out_free;
99
100 mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
101 pages, (unsigned long)DLM_HASH_PAGES,
102 (unsigned long)DLM_BUCKETS_PER_PAGE);
103 return vec;
104 out_free:
105 dlm_free_pagevec(vec, i);
106 return NULL;
107 }
108
109 /*
110 *
111 * spinlock lock ordering: if multiple locks are needed, obey this ordering:
112 * dlm_domain_lock
113 * struct dlm_ctxt->spinlock
114 * struct dlm_lock_resource->spinlock
115 * struct dlm_ctxt->master_lock
116 * struct dlm_ctxt->ast_lock
117 * dlm_master_list_entry->spinlock
118 * dlm_lock->spinlock
119 *
120 */
121
122 DEFINE_SPINLOCK(dlm_domain_lock);
123 LIST_HEAD(dlm_domains);
124 static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
125
126 /*
127 * The supported protocol version for DLM communication. Running domains
128 * will have a negotiated version with the same major number and a minor
129 * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
130 * be used to determine what a running domain is actually using.
131 *
132 * New in version 1.1:
133 * - Message DLM_QUERY_REGION added to support global heartbeat
134 * - Message DLM_QUERY_NODEINFO added to allow online node removes
135 */
136 static const struct dlm_protocol_version dlm_protocol = {
137 .pv_major = 1,
138 .pv_minor = 1,
139 };
140
141 #define DLM_DOMAIN_BACKOFF_MS 200
142
143 static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
144 void **ret_data);
145 static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
146 void **ret_data);
147 static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
148 void **ret_data);
149 static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
150 void *data, void **ret_data);
151 static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
152 void **ret_data);
153 static int dlm_protocol_compare(struct dlm_protocol_version *existing,
154 struct dlm_protocol_version *request);
155
156 static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
157
158 void __dlm_unhash_lockres(struct dlm_lock_resource *lockres)
159 {
160 if (!hlist_unhashed(&lockres->hash_node)) {
161 hlist_del_init(&lockres->hash_node);
162 dlm_lockres_put(lockres);
163 }
164 }
165
166 void __dlm_insert_lockres(struct dlm_ctxt *dlm,
167 struct dlm_lock_resource *res)
168 {
169 struct hlist_head *bucket;
170 struct qstr *q;
171
172 assert_spin_locked(&dlm->spinlock);
173
174 q = &res->lockname;
175 bucket = dlm_lockres_hash(dlm, q->hash);
176
177 /* get a reference for our hashtable */
178 dlm_lockres_get(res);
179
180 hlist_add_head(&res->hash_node, bucket);
181 }
182
183 struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
184 const char *name,
185 unsigned int len,
186 unsigned int hash)
187 {
188 struct hlist_head *bucket;
189 struct hlist_node *list;
190
191 mlog(0, "%.*s\n", len, name);
192
193 assert_spin_locked(&dlm->spinlock);
194
195 bucket = dlm_lockres_hash(dlm, hash);
196
197 hlist_for_each(list, bucket) {
198 struct dlm_lock_resource *res = hlist_entry(list,
199 struct dlm_lock_resource, hash_node);
200 if (res->lockname.name[0] != name[0])
201 continue;
202 if (unlikely(res->lockname.len != len))
203 continue;
204 if (memcmp(res->lockname.name + 1, name + 1, len - 1))
205 continue;
206 dlm_lockres_get(res);
207 return res;
208 }
209 return NULL;
210 }
211
212 /* intended to be called by functions which do not care about lock
213 * resources which are being purged (most net _handler functions).
214 * this will return NULL for any lock resource which is found but
215 * currently in the process of dropping its mastery reference.
216 * use __dlm_lookup_lockres_full when you need the lock resource
217 * regardless (e.g. dlm_get_lock_resource) */
218 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
219 const char *name,
220 unsigned int len,
221 unsigned int hash)
222 {
223 struct dlm_lock_resource *res = NULL;
224
225 mlog(0, "%.*s\n", len, name);
226
227 assert_spin_locked(&dlm->spinlock);
228
229 res = __dlm_lookup_lockres_full(dlm, name, len, hash);
230 if (res) {
231 spin_lock(&res->spinlock);
232 if (res->state & DLM_LOCK_RES_DROPPING_REF) {
233 spin_unlock(&res->spinlock);
234 dlm_lockres_put(res);
235 return NULL;
236 }
237 spin_unlock(&res->spinlock);
238 }
239
240 return res;
241 }
242
243 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
244 const char *name,
245 unsigned int len)
246 {
247 struct dlm_lock_resource *res;
248 unsigned int hash = dlm_lockid_hash(name, len);
249
250 spin_lock(&dlm->spinlock);
251 res = __dlm_lookup_lockres(dlm, name, len, hash);
252 spin_unlock(&dlm->spinlock);
253 return res;
254 }
255
256 static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len)
257 {
258 struct dlm_ctxt *tmp = NULL;
259 struct list_head *iter;
260
261 assert_spin_locked(&dlm_domain_lock);
262
263 /* tmp->name here is always NULL terminated,
264 * but domain may not be! */
265 list_for_each(iter, &dlm_domains) {
266 tmp = list_entry (iter, struct dlm_ctxt, list);
267 if (strlen(tmp->name) == len &&
268 memcmp(tmp->name, domain, len)==0)
269 break;
270 tmp = NULL;
271 }
272
273 return tmp;
274 }
275
276 /* For null terminated domain strings ONLY */
277 static struct dlm_ctxt * __dlm_lookup_domain(const char *domain)
278 {
279 assert_spin_locked(&dlm_domain_lock);
280
281 return __dlm_lookup_domain_full(domain, strlen(domain));
282 }
283
284
285 /* returns true on one of two conditions:
286 * 1) the domain does not exist
287 * 2) the domain exists and it's state is "joined" */
288 static int dlm_wait_on_domain_helper(const char *domain)
289 {
290 int ret = 0;
291 struct dlm_ctxt *tmp = NULL;
292
293 spin_lock(&dlm_domain_lock);
294
295 tmp = __dlm_lookup_domain(domain);
296 if (!tmp)
297 ret = 1;
298 else if (tmp->dlm_state == DLM_CTXT_JOINED)
299 ret = 1;
300
301 spin_unlock(&dlm_domain_lock);
302 return ret;
303 }
304
305 static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
306 {
307 dlm_destroy_debugfs_subroot(dlm);
308
309 if (dlm->lockres_hash)
310 dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
311
312 if (dlm->master_hash)
313 dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
314
315 if (dlm->name)
316 kfree(dlm->name);
317
318 kfree(dlm);
319 }
320
321 /* A little strange - this function will be called while holding
322 * dlm_domain_lock and is expected to be holding it on the way out. We
323 * will however drop and reacquire it multiple times */
324 static void dlm_ctxt_release(struct kref *kref)
325 {
326 struct dlm_ctxt *dlm;
327
328 dlm = container_of(kref, struct dlm_ctxt, dlm_refs);
329
330 BUG_ON(dlm->num_joins);
331 BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED);
332
333 /* we may still be in the list if we hit an error during join. */
334 list_del_init(&dlm->list);
335
336 spin_unlock(&dlm_domain_lock);
337
338 mlog(0, "freeing memory from domain %s\n", dlm->name);
339
340 wake_up(&dlm_domain_events);
341
342 dlm_free_ctxt_mem(dlm);
343
344 spin_lock(&dlm_domain_lock);
345 }
346
347 void dlm_put(struct dlm_ctxt *dlm)
348 {
349 spin_lock(&dlm_domain_lock);
350 kref_put(&dlm->dlm_refs, dlm_ctxt_release);
351 spin_unlock(&dlm_domain_lock);
352 }
353
354 static void __dlm_get(struct dlm_ctxt *dlm)
355 {
356 kref_get(&dlm->dlm_refs);
357 }
358
359 /* given a questionable reference to a dlm object, gets a reference if
360 * it can find it in the list, otherwise returns NULL in which case
361 * you shouldn't trust your pointer. */
362 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm)
363 {
364 struct list_head *iter;
365 struct dlm_ctxt *target = NULL;
366
367 spin_lock(&dlm_domain_lock);
368
369 list_for_each(iter, &dlm_domains) {
370 target = list_entry (iter, struct dlm_ctxt, list);
371
372 if (target == dlm) {
373 __dlm_get(target);
374 break;
375 }
376
377 target = NULL;
378 }
379
380 spin_unlock(&dlm_domain_lock);
381
382 return target;
383 }
384
385 int dlm_domain_fully_joined(struct dlm_ctxt *dlm)
386 {
387 int ret;
388
389 spin_lock(&dlm_domain_lock);
390 ret = (dlm->dlm_state == DLM_CTXT_JOINED) ||
391 (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN);
392 spin_unlock(&dlm_domain_lock);
393
394 return ret;
395 }
396
397 static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
398 {
399 if (dlm->dlm_worker) {
400 flush_workqueue(dlm->dlm_worker);
401 destroy_workqueue(dlm->dlm_worker);
402 dlm->dlm_worker = NULL;
403 }
404 }
405
406 static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
407 {
408 dlm_unregister_domain_handlers(dlm);
409 dlm_debug_shutdown(dlm);
410 dlm_complete_thread(dlm);
411 dlm_complete_recovery_thread(dlm);
412 dlm_destroy_dlm_worker(dlm);
413
414 /* We've left the domain. Now we can take ourselves out of the
415 * list and allow the kref stuff to help us free the
416 * memory. */
417 spin_lock(&dlm_domain_lock);
418 list_del_init(&dlm->list);
419 spin_unlock(&dlm_domain_lock);
420
421 /* Wake up anyone waiting for us to remove this domain */
422 wake_up(&dlm_domain_events);
423 }
424
425 static int dlm_migrate_all_locks(struct dlm_ctxt *dlm)
426 {
427 int i, num, n, ret = 0;
428 struct dlm_lock_resource *res;
429 struct hlist_node *iter;
430 struct hlist_head *bucket;
431 int dropped;
432
433 mlog(0, "Migrating locks from domain %s\n", dlm->name);
434
435 num = 0;
436 spin_lock(&dlm->spinlock);
437 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
438 redo_bucket:
439 n = 0;
440 bucket = dlm_lockres_hash(dlm, i);
441 iter = bucket->first;
442 while (iter) {
443 n++;
444 res = hlist_entry(iter, struct dlm_lock_resource,
445 hash_node);
446 dlm_lockres_get(res);
447 /* migrate, if necessary. this will drop the dlm
448 * spinlock and retake it if it does migration. */
449 dropped = dlm_empty_lockres(dlm, res);
450
451 spin_lock(&res->spinlock);
452 __dlm_lockres_calc_usage(dlm, res);
453 iter = res->hash_node.next;
454 spin_unlock(&res->spinlock);
455
456 dlm_lockres_put(res);
457
458 if (dropped)
459 goto redo_bucket;
460 }
461 cond_resched_lock(&dlm->spinlock);
462 num += n;
463 }
464 spin_unlock(&dlm->spinlock);
465 wake_up(&dlm->dlm_thread_wq);
466
467 /* let the dlm thread take care of purging, keep scanning until
468 * nothing remains in the hash */
469 if (num) {
470 mlog(0, "%s: %d lock resources in hash last pass\n",
471 dlm->name, num);
472 ret = -EAGAIN;
473 }
474 mlog(0, "DONE Migrating locks from domain %s\n", dlm->name);
475 return ret;
476 }
477
478 static int dlm_no_joining_node(struct dlm_ctxt *dlm)
479 {
480 int ret;
481
482 spin_lock(&dlm->spinlock);
483 ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN;
484 spin_unlock(&dlm->spinlock);
485
486 return ret;
487 }
488
489 static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm)
490 {
491 /* Yikes, a double spinlock! I need domain_lock for the dlm
492 * state and the dlm spinlock for join state... Sorry! */
493 again:
494 spin_lock(&dlm_domain_lock);
495 spin_lock(&dlm->spinlock);
496
497 if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
498 mlog(0, "Node %d is joining, we wait on it.\n",
499 dlm->joining_node);
500 spin_unlock(&dlm->spinlock);
501 spin_unlock(&dlm_domain_lock);
502
503 wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm));
504 goto again;
505 }
506
507 dlm->dlm_state = DLM_CTXT_LEAVING;
508 spin_unlock(&dlm->spinlock);
509 spin_unlock(&dlm_domain_lock);
510 }
511
512 static void __dlm_print_nodes(struct dlm_ctxt *dlm)
513 {
514 int node = -1;
515
516 assert_spin_locked(&dlm->spinlock);
517
518 printk(KERN_NOTICE "o2dlm: Nodes in domain %s: ", dlm->name);
519
520 while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
521 node + 1)) < O2NM_MAX_NODES) {
522 printk("%d ", node);
523 }
524 printk("\n");
525 }
526
527 static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
528 void **ret_data)
529 {
530 struct dlm_ctxt *dlm = data;
531 unsigned int node;
532 struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
533
534 mlog(0, "%p %u %p", msg, len, data);
535
536 if (!dlm_grab(dlm))
537 return 0;
538
539 node = exit_msg->node_idx;
540
541 printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s\n", node, dlm->name);
542
543 spin_lock(&dlm->spinlock);
544 clear_bit(node, dlm->domain_map);
545 __dlm_print_nodes(dlm);
546
547 /* notify anything attached to the heartbeat events */
548 dlm_hb_event_notify_attached(dlm, node, 0);
549
550 spin_unlock(&dlm->spinlock);
551
552 dlm_put(dlm);
553
554 return 0;
555 }
556
557 static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm,
558 unsigned int node)
559 {
560 int status;
561 struct dlm_exit_domain leave_msg;
562
563 mlog(0, "Asking node %u if we can leave the domain %s me = %u\n",
564 node, dlm->name, dlm->node_num);
565
566 memset(&leave_msg, 0, sizeof(leave_msg));
567 leave_msg.node_idx = dlm->node_num;
568
569 status = o2net_send_message(DLM_EXIT_DOMAIN_MSG, dlm->key,
570 &leave_msg, sizeof(leave_msg), node,
571 NULL);
572 if (status < 0)
573 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
574 "node %u\n", status, DLM_EXIT_DOMAIN_MSG, dlm->key, node);
575 mlog(0, "status return %d from o2net_send_message\n", status);
576
577 return status;
578 }
579
580
581 static void dlm_leave_domain(struct dlm_ctxt *dlm)
582 {
583 int node, clear_node, status;
584
585 /* At this point we've migrated away all our locks and won't
586 * accept mastership of new ones. The dlm is responsible for
587 * almost nothing now. We make sure not to confuse any joining
588 * nodes and then commence shutdown procedure. */
589
590 spin_lock(&dlm->spinlock);
591 /* Clear ourselves from the domain map */
592 clear_bit(dlm->node_num, dlm->domain_map);
593 while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
594 0)) < O2NM_MAX_NODES) {
595 /* Drop the dlm spinlock. This is safe wrt the domain_map.
596 * -nodes cannot be added now as the
597 * query_join_handlers knows to respond with OK_NO_MAP
598 * -we catch the right network errors if a node is
599 * removed from the map while we're sending him the
600 * exit message. */
601 spin_unlock(&dlm->spinlock);
602
603 clear_node = 1;
604
605 status = dlm_send_one_domain_exit(dlm, node);
606 if (status < 0 &&
607 status != -ENOPROTOOPT &&
608 status != -ENOTCONN) {
609 mlog(ML_NOTICE, "Error %d sending domain exit message "
610 "to node %d\n", status, node);
611
612 /* Not sure what to do here but lets sleep for
613 * a bit in case this was a transient
614 * error... */
615 msleep(DLM_DOMAIN_BACKOFF_MS);
616 clear_node = 0;
617 }
618
619 spin_lock(&dlm->spinlock);
620 /* If we're not clearing the node bit then we intend
621 * to loop back around to try again. */
622 if (clear_node)
623 clear_bit(node, dlm->domain_map);
624 }
625 spin_unlock(&dlm->spinlock);
626 }
627
628 int dlm_joined(struct dlm_ctxt *dlm)
629 {
630 int ret = 0;
631
632 spin_lock(&dlm_domain_lock);
633
634 if (dlm->dlm_state == DLM_CTXT_JOINED)
635 ret = 1;
636
637 spin_unlock(&dlm_domain_lock);
638
639 return ret;
640 }
641
642 int dlm_shutting_down(struct dlm_ctxt *dlm)
643 {
644 int ret = 0;
645
646 spin_lock(&dlm_domain_lock);
647
648 if (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN)
649 ret = 1;
650
651 spin_unlock(&dlm_domain_lock);
652
653 return ret;
654 }
655
656 void dlm_unregister_domain(struct dlm_ctxt *dlm)
657 {
658 int leave = 0;
659 struct dlm_lock_resource *res;
660
661 spin_lock(&dlm_domain_lock);
662 BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED);
663 BUG_ON(!dlm->num_joins);
664
665 dlm->num_joins--;
666 if (!dlm->num_joins) {
667 /* We mark it "in shutdown" now so new register
668 * requests wait until we've completely left the
669 * domain. Don't use DLM_CTXT_LEAVING yet as we still
670 * want new domain joins to communicate with us at
671 * least until we've completed migration of our
672 * resources. */
673 dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN;
674 leave = 1;
675 }
676 spin_unlock(&dlm_domain_lock);
677
678 if (leave) {
679 mlog(0, "shutting down domain %s\n", dlm->name);
680
681 /* We changed dlm state, notify the thread */
682 dlm_kick_thread(dlm, NULL);
683
684 while (dlm_migrate_all_locks(dlm)) {
685 /* Give dlm_thread time to purge the lockres' */
686 msleep(500);
687 mlog(0, "%s: more migration to do\n", dlm->name);
688 }
689
690 /* This list should be empty. If not, print remaining lockres */
691 if (!list_empty(&dlm->tracking_list)) {
692 mlog(ML_ERROR, "Following lockres' are still on the "
693 "tracking list:\n");
694 list_for_each_entry(res, &dlm->tracking_list, tracking)
695 dlm_print_one_lock_resource(res);
696 }
697
698 dlm_mark_domain_leaving(dlm);
699 dlm_leave_domain(dlm);
700 dlm_force_free_mles(dlm);
701 dlm_complete_dlm_shutdown(dlm);
702 }
703 dlm_put(dlm);
704 }
705 EXPORT_SYMBOL_GPL(dlm_unregister_domain);
706
707 static int dlm_query_join_proto_check(char *proto_type, int node,
708 struct dlm_protocol_version *ours,
709 struct dlm_protocol_version *request)
710 {
711 int rc;
712 struct dlm_protocol_version proto = *request;
713
714 if (!dlm_protocol_compare(ours, &proto)) {
715 mlog(0,
716 "node %u wanted to join with %s locking protocol "
717 "%u.%u, we respond with %u.%u\n",
718 node, proto_type,
719 request->pv_major,
720 request->pv_minor,
721 proto.pv_major, proto.pv_minor);
722 request->pv_minor = proto.pv_minor;
723 rc = 0;
724 } else {
725 mlog(ML_NOTICE,
726 "Node %u wanted to join with %s locking "
727 "protocol %u.%u, but we have %u.%u, disallowing\n",
728 node, proto_type,
729 request->pv_major,
730 request->pv_minor,
731 ours->pv_major,
732 ours->pv_minor);
733 rc = 1;
734 }
735
736 return rc;
737 }
738
739 /*
740 * struct dlm_query_join_packet is made up of four one-byte fields. They
741 * are effectively in big-endian order already. However, little-endian
742 * machines swap them before putting the packet on the wire (because
743 * query_join's response is a status, and that status is treated as a u32
744 * on the wire). Thus, a big-endian and little-endian machines will treat
745 * this structure differently.
746 *
747 * The solution is to have little-endian machines swap the structure when
748 * converting from the structure to the u32 representation. This will
749 * result in the structure having the correct format on the wire no matter
750 * the host endian format.
751 */
752 static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet,
753 u32 *wire)
754 {
755 union dlm_query_join_response response;
756
757 response.packet = *packet;
758 *wire = cpu_to_be32(response.intval);
759 }
760
761 static void dlm_query_join_wire_to_packet(u32 wire,
762 struct dlm_query_join_packet *packet)
763 {
764 union dlm_query_join_response response;
765
766 response.intval = cpu_to_be32(wire);
767 *packet = response.packet;
768 }
769
770 static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
771 void **ret_data)
772 {
773 struct dlm_query_join_request *query;
774 struct dlm_query_join_packet packet = {
775 .code = JOIN_DISALLOW,
776 };
777 struct dlm_ctxt *dlm = NULL;
778 u32 response;
779 u8 nodenum;
780
781 query = (struct dlm_query_join_request *) msg->buf;
782
783 mlog(0, "node %u wants to join domain %s\n", query->node_idx,
784 query->domain);
785
786 /*
787 * If heartbeat doesn't consider the node live, tell it
788 * to back off and try again. This gives heartbeat a chance
789 * to catch up.
790 */
791 if (!o2hb_check_node_heartbeating(query->node_idx)) {
792 mlog(0, "node %u is not in our live map yet\n",
793 query->node_idx);
794
795 packet.code = JOIN_DISALLOW;
796 goto respond;
797 }
798
799 packet.code = JOIN_OK_NO_MAP;
800
801 spin_lock(&dlm_domain_lock);
802 dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
803 if (!dlm)
804 goto unlock_respond;
805
806 /*
807 * There is a small window where the joining node may not see the
808 * node(s) that just left but still part of the cluster. DISALLOW
809 * join request if joining node has different node map.
810 */
811 nodenum=0;
812 while (nodenum < O2NM_MAX_NODES) {
813 if (test_bit(nodenum, dlm->domain_map)) {
814 if (!byte_test_bit(nodenum, query->node_map)) {
815 mlog(0, "disallow join as node %u does not "
816 "have node %u in its nodemap\n",
817 query->node_idx, nodenum);
818 packet.code = JOIN_DISALLOW;
819 goto unlock_respond;
820 }
821 }
822 nodenum++;
823 }
824
825 /* Once the dlm ctxt is marked as leaving then we don't want
826 * to be put in someone's domain map.
827 * Also, explicitly disallow joining at certain troublesome
828 * times (ie. during recovery). */
829 if (dlm && dlm->dlm_state != DLM_CTXT_LEAVING) {
830 int bit = query->node_idx;
831 spin_lock(&dlm->spinlock);
832
833 if (dlm->dlm_state == DLM_CTXT_NEW &&
834 dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) {
835 /*If this is a brand new context and we
836 * haven't started our join process yet, then
837 * the other node won the race. */
838 packet.code = JOIN_OK_NO_MAP;
839 } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
840 /* Disallow parallel joins. */
841 packet.code = JOIN_DISALLOW;
842 } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
843 mlog(0, "node %u trying to join, but recovery "
844 "is ongoing.\n", bit);
845 packet.code = JOIN_DISALLOW;
846 } else if (test_bit(bit, dlm->recovery_map)) {
847 mlog(0, "node %u trying to join, but it "
848 "still needs recovery.\n", bit);
849 packet.code = JOIN_DISALLOW;
850 } else if (test_bit(bit, dlm->domain_map)) {
851 mlog(0, "node %u trying to join, but it "
852 "is still in the domain! needs recovery?\n",
853 bit);
854 packet.code = JOIN_DISALLOW;
855 } else {
856 /* Alright we're fully a part of this domain
857 * so we keep some state as to who's joining
858 * and indicate to him that needs to be fixed
859 * up. */
860
861 /* Make sure we speak compatible locking protocols. */
862 if (dlm_query_join_proto_check("DLM", bit,
863 &dlm->dlm_locking_proto,
864 &query->dlm_proto)) {
865 packet.code = JOIN_PROTOCOL_MISMATCH;
866 } else if (dlm_query_join_proto_check("fs", bit,
867 &dlm->fs_locking_proto,
868 &query->fs_proto)) {
869 packet.code = JOIN_PROTOCOL_MISMATCH;
870 } else {
871 packet.dlm_minor = query->dlm_proto.pv_minor;
872 packet.fs_minor = query->fs_proto.pv_minor;
873 packet.code = JOIN_OK;
874 __dlm_set_joining_node(dlm, query->node_idx);
875 }
876 }
877
878 spin_unlock(&dlm->spinlock);
879 }
880 unlock_respond:
881 spin_unlock(&dlm_domain_lock);
882
883 respond:
884 mlog(0, "We respond with %u\n", packet.code);
885
886 dlm_query_join_packet_to_wire(&packet, &response);
887 return response;
888 }
889
890 static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
891 void **ret_data)
892 {
893 struct dlm_assert_joined *assert;
894 struct dlm_ctxt *dlm = NULL;
895
896 assert = (struct dlm_assert_joined *) msg->buf;
897
898 mlog(0, "node %u asserts join on domain %s\n", assert->node_idx,
899 assert->domain);
900
901 spin_lock(&dlm_domain_lock);
902 dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len);
903 /* XXX should we consider no dlm ctxt an error? */
904 if (dlm) {
905 spin_lock(&dlm->spinlock);
906
907 /* Alright, this node has officially joined our
908 * domain. Set him in the map and clean up our
909 * leftover join state. */
910 BUG_ON(dlm->joining_node != assert->node_idx);
911 set_bit(assert->node_idx, dlm->domain_map);
912 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
913
914 printk(KERN_NOTICE "o2dlm: Node %u joins domain %s\n",
915 assert->node_idx, dlm->name);
916 __dlm_print_nodes(dlm);
917
918 /* notify anything attached to the heartbeat events */
919 dlm_hb_event_notify_attached(dlm, assert->node_idx, 1);
920
921 spin_unlock(&dlm->spinlock);
922 }
923 spin_unlock(&dlm_domain_lock);
924
925 return 0;
926 }
927
928 static int dlm_match_regions(struct dlm_ctxt *dlm,
929 struct dlm_query_region *qr,
930 char *local, int locallen)
931 {
932 char *remote = qr->qr_regions;
933 char *l, *r;
934 int localnr, i, j, foundit;
935 int status = 0;
936
937 if (!o2hb_global_heartbeat_active()) {
938 if (qr->qr_numregions) {
939 mlog(ML_ERROR, "Domain %s: Joining node %d has global "
940 "heartbeat enabled but local node %d does not\n",
941 qr->qr_domain, qr->qr_node, dlm->node_num);
942 status = -EINVAL;
943 }
944 goto bail;
945 }
946
947 if (o2hb_global_heartbeat_active() && !qr->qr_numregions) {
948 mlog(ML_ERROR, "Domain %s: Local node %d has global "
949 "heartbeat enabled but joining node %d does not\n",
950 qr->qr_domain, dlm->node_num, qr->qr_node);
951 status = -EINVAL;
952 goto bail;
953 }
954
955 r = remote;
956 for (i = 0; i < qr->qr_numregions; ++i) {
957 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r);
958 r += O2HB_MAX_REGION_NAME_LEN;
959 }
960
961 localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN);
962 localnr = o2hb_get_all_regions(local, (u8)localnr);
963
964 /* compare local regions with remote */
965 l = local;
966 for (i = 0; i < localnr; ++i) {
967 foundit = 0;
968 r = remote;
969 for (j = 0; j <= qr->qr_numregions; ++j) {
970 if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) {
971 foundit = 1;
972 break;
973 }
974 r += O2HB_MAX_REGION_NAME_LEN;
975 }
976 if (!foundit) {
977 status = -EINVAL;
978 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
979 "in local node %d but not in joining node %d\n",
980 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l,
981 dlm->node_num, qr->qr_node);
982 goto bail;
983 }
984 l += O2HB_MAX_REGION_NAME_LEN;
985 }
986
987 /* compare remote with local regions */
988 r = remote;
989 for (i = 0; i < qr->qr_numregions; ++i) {
990 foundit = 0;
991 l = local;
992 for (j = 0; j < localnr; ++j) {
993 if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) {
994 foundit = 1;
995 break;
996 }
997 l += O2HB_MAX_REGION_NAME_LEN;
998 }
999 if (!foundit) {
1000 status = -EINVAL;
1001 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1002 "in joining node %d but not in local node %d\n",
1003 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r,
1004 qr->qr_node, dlm->node_num);
1005 goto bail;
1006 }
1007 r += O2HB_MAX_REGION_NAME_LEN;
1008 }
1009
1010 bail:
1011 return status;
1012 }
1013
1014 static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map)
1015 {
1016 struct dlm_query_region *qr = NULL;
1017 int status, ret = 0, i;
1018 char *p;
1019
1020 if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
1021 goto bail;
1022
1023 qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL);
1024 if (!qr) {
1025 ret = -ENOMEM;
1026 mlog_errno(ret);
1027 goto bail;
1028 }
1029
1030 qr->qr_node = dlm->node_num;
1031 qr->qr_namelen = strlen(dlm->name);
1032 memcpy(qr->qr_domain, dlm->name, qr->qr_namelen);
1033 /* if local hb, the numregions will be zero */
1034 if (o2hb_global_heartbeat_active())
1035 qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions,
1036 O2NM_MAX_REGIONS);
1037
1038 p = qr->qr_regions;
1039 for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN)
1040 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p);
1041
1042 i = -1;
1043 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1044 i + 1)) < O2NM_MAX_NODES) {
1045 if (i == dlm->node_num)
1046 continue;
1047
1048 mlog(0, "Sending regions to node %d\n", i);
1049
1050 ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr,
1051 sizeof(struct dlm_query_region),
1052 i, &status);
1053 if (ret >= 0)
1054 ret = status;
1055 if (ret) {
1056 mlog(ML_ERROR, "Region mismatch %d, node %d\n",
1057 ret, i);
1058 break;
1059 }
1060 }
1061
1062 bail:
1063 kfree(qr);
1064 return ret;
1065 }
1066
1067 static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
1068 void *data, void **ret_data)
1069 {
1070 struct dlm_query_region *qr;
1071 struct dlm_ctxt *dlm = NULL;
1072 char *local = NULL;
1073 int status = 0;
1074 int locked = 0;
1075
1076 qr = (struct dlm_query_region *) msg->buf;
1077
1078 mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node,
1079 qr->qr_domain);
1080
1081 /* buffer used in dlm_mast_regions() */
1082 local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL);
1083 if (!local) {
1084 status = -ENOMEM;
1085 goto bail;
1086 }
1087
1088 status = -EINVAL;
1089
1090 spin_lock(&dlm_domain_lock);
1091 dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen);
1092 if (!dlm) {
1093 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1094 "before join domain\n", qr->qr_node, qr->qr_domain);
1095 goto bail;
1096 }
1097
1098 spin_lock(&dlm->spinlock);
1099 locked = 1;
1100 if (dlm->joining_node != qr->qr_node) {
1101 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1102 "but joining node is %d\n", qr->qr_node, qr->qr_domain,
1103 dlm->joining_node);
1104 goto bail;
1105 }
1106
1107 /* Support for global heartbeat was added in 1.1 */
1108 if (dlm->dlm_locking_proto.pv_major == 1 &&
1109 dlm->dlm_locking_proto.pv_minor == 0) {
1110 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1111 "but active dlm protocol is %d.%d\n", qr->qr_node,
1112 qr->qr_domain, dlm->dlm_locking_proto.pv_major,
1113 dlm->dlm_locking_proto.pv_minor);
1114 goto bail;
1115 }
1116
1117 status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions));
1118
1119 bail:
1120 if (locked)
1121 spin_unlock(&dlm->spinlock);
1122 spin_unlock(&dlm_domain_lock);
1123
1124 kfree(local);
1125
1126 return status;
1127 }
1128
1129 static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn)
1130 {
1131 struct o2nm_node *local;
1132 struct dlm_node_info *remote;
1133 int i, j;
1134 int status = 0;
1135
1136 for (j = 0; j < qn->qn_numnodes; ++j)
1137 mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum,
1138 &(qn->qn_nodes[j].ni_ipv4_address),
1139 ntohs(qn->qn_nodes[j].ni_ipv4_port));
1140
1141 for (i = 0; i < O2NM_MAX_NODES && !status; ++i) {
1142 local = o2nm_get_node_by_num(i);
1143 remote = NULL;
1144 for (j = 0; j < qn->qn_numnodes; ++j) {
1145 if (qn->qn_nodes[j].ni_nodenum == i) {
1146 remote = &(qn->qn_nodes[j]);
1147 break;
1148 }
1149 }
1150
1151 if (!local && !remote)
1152 continue;
1153
1154 if ((local && !remote) || (!local && remote))
1155 status = -EINVAL;
1156
1157 if (!status &&
1158 ((remote->ni_nodenum != local->nd_num) ||
1159 (remote->ni_ipv4_port != local->nd_ipv4_port) ||
1160 (remote->ni_ipv4_address != local->nd_ipv4_address)))
1161 status = -EINVAL;
1162
1163 if (status) {
1164 if (remote && !local)
1165 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1166 "registered in joining node %d but not in "
1167 "local node %d\n", qn->qn_domain,
1168 remote->ni_nodenum,
1169 &(remote->ni_ipv4_address),
1170 ntohs(remote->ni_ipv4_port),
1171 qn->qn_nodenum, dlm->node_num);
1172 if (local && !remote)
1173 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1174 "registered in local node %d but not in "
1175 "joining node %d\n", qn->qn_domain,
1176 local->nd_num, &(local->nd_ipv4_address),
1177 ntohs(local->nd_ipv4_port),
1178 dlm->node_num, qn->qn_nodenum);
1179 BUG_ON((!local && !remote));
1180 }
1181
1182 if (local)
1183 o2nm_node_put(local);
1184 }
1185
1186 return status;
1187 }
1188
1189 static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map)
1190 {
1191 struct dlm_query_nodeinfo *qn = NULL;
1192 struct o2nm_node *node;
1193 int ret = 0, status, count, i;
1194
1195 if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
1196 goto bail;
1197
1198 qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL);
1199 if (!qn) {
1200 ret = -ENOMEM;
1201 mlog_errno(ret);
1202 goto bail;
1203 }
1204
1205 for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) {
1206 node = o2nm_get_node_by_num(i);
1207 if (!node)
1208 continue;
1209 qn->qn_nodes[count].ni_nodenum = node->nd_num;
1210 qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port;
1211 qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address;
1212 mlog(0, "Node %3d, %pI4:%u\n", node->nd_num,
1213 &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port));
1214 ++count;
1215 o2nm_node_put(node);
1216 }
1217
1218 qn->qn_nodenum = dlm->node_num;
1219 qn->qn_numnodes = count;
1220 qn->qn_namelen = strlen(dlm->name);
1221 memcpy(qn->qn_domain, dlm->name, qn->qn_namelen);
1222
1223 i = -1;
1224 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1225 i + 1)) < O2NM_MAX_NODES) {
1226 if (i == dlm->node_num)
1227 continue;
1228
1229 mlog(0, "Sending nodeinfo to node %d\n", i);
1230
1231 ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
1232 qn, sizeof(struct dlm_query_nodeinfo),
1233 i, &status);
1234 if (ret >= 0)
1235 ret = status;
1236 if (ret) {
1237 mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i);
1238 break;
1239 }
1240 }
1241
1242 bail:
1243 kfree(qn);
1244 return ret;
1245 }
1246
1247 static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len,
1248 void *data, void **ret_data)
1249 {
1250 struct dlm_query_nodeinfo *qn;
1251 struct dlm_ctxt *dlm = NULL;
1252 int locked = 0, status = -EINVAL;
1253
1254 qn = (struct dlm_query_nodeinfo *) msg->buf;
1255
1256 mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum,
1257 qn->qn_domain);
1258
1259 spin_lock(&dlm_domain_lock);
1260 dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen);
1261 if (!dlm) {
1262 mlog(ML_ERROR, "Node %d queried nodes on domain %s before "
1263 "join domain\n", qn->qn_nodenum, qn->qn_domain);
1264 goto bail;
1265 }
1266
1267 spin_lock(&dlm->spinlock);
1268 locked = 1;
1269 if (dlm->joining_node != qn->qn_nodenum) {
1270 mlog(ML_ERROR, "Node %d queried nodes on domain %s but "
1271 "joining node is %d\n", qn->qn_nodenum, qn->qn_domain,
1272 dlm->joining_node);
1273 goto bail;
1274 }
1275
1276 /* Support for node query was added in 1.1 */
1277 if (dlm->dlm_locking_proto.pv_major == 1 &&
1278 dlm->dlm_locking_proto.pv_minor == 0) {
1279 mlog(ML_ERROR, "Node %d queried nodes on domain %s "
1280 "but active dlm protocol is %d.%d\n", qn->qn_nodenum,
1281 qn->qn_domain, dlm->dlm_locking_proto.pv_major,
1282 dlm->dlm_locking_proto.pv_minor);
1283 goto bail;
1284 }
1285
1286 status = dlm_match_nodes(dlm, qn);
1287
1288 bail:
1289 if (locked)
1290 spin_unlock(&dlm->spinlock);
1291 spin_unlock(&dlm_domain_lock);
1292
1293 return status;
1294 }
1295
1296 static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
1297 void **ret_data)
1298 {
1299 struct dlm_cancel_join *cancel;
1300 struct dlm_ctxt *dlm = NULL;
1301
1302 cancel = (struct dlm_cancel_join *) msg->buf;
1303
1304 mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx,
1305 cancel->domain);
1306
1307 spin_lock(&dlm_domain_lock);
1308 dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len);
1309
1310 if (dlm) {
1311 spin_lock(&dlm->spinlock);
1312
1313 /* Yikes, this guy wants to cancel his join. No
1314 * problem, we simply cleanup our join state. */
1315 BUG_ON(dlm->joining_node != cancel->node_idx);
1316 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1317
1318 spin_unlock(&dlm->spinlock);
1319 }
1320 spin_unlock(&dlm_domain_lock);
1321
1322 return 0;
1323 }
1324
1325 static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm,
1326 unsigned int node)
1327 {
1328 int status;
1329 struct dlm_cancel_join cancel_msg;
1330
1331 memset(&cancel_msg, 0, sizeof(cancel_msg));
1332 cancel_msg.node_idx = dlm->node_num;
1333 cancel_msg.name_len = strlen(dlm->name);
1334 memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len);
1335
1336 status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1337 &cancel_msg, sizeof(cancel_msg), node,
1338 NULL);
1339 if (status < 0) {
1340 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1341 "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1342 node);
1343 goto bail;
1344 }
1345
1346 bail:
1347 return status;
1348 }
1349
1350 /* map_size should be in bytes. */
1351 static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
1352 unsigned long *node_map,
1353 unsigned int map_size)
1354 {
1355 int status, tmpstat;
1356 unsigned int node;
1357
1358 if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) *
1359 sizeof(unsigned long))) {
1360 mlog(ML_ERROR,
1361 "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
1362 map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES));
1363 return -EINVAL;
1364 }
1365
1366 status = 0;
1367 node = -1;
1368 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1369 node + 1)) < O2NM_MAX_NODES) {
1370 if (node == dlm->node_num)
1371 continue;
1372
1373 tmpstat = dlm_send_one_join_cancel(dlm, node);
1374 if (tmpstat) {
1375 mlog(ML_ERROR, "Error return %d cancelling join on "
1376 "node %d\n", tmpstat, node);
1377 if (!status)
1378 status = tmpstat;
1379 }
1380 }
1381
1382 if (status)
1383 mlog_errno(status);
1384 return status;
1385 }
1386
1387 static int dlm_request_join(struct dlm_ctxt *dlm,
1388 int node,
1389 enum dlm_query_join_response_code *response)
1390 {
1391 int status;
1392 struct dlm_query_join_request join_msg;
1393 struct dlm_query_join_packet packet;
1394 u32 join_resp;
1395
1396 mlog(0, "querying node %d\n", node);
1397
1398 memset(&join_msg, 0, sizeof(join_msg));
1399 join_msg.node_idx = dlm->node_num;
1400 join_msg.name_len = strlen(dlm->name);
1401 memcpy(join_msg.domain, dlm->name, join_msg.name_len);
1402 join_msg.dlm_proto = dlm->dlm_locking_proto;
1403 join_msg.fs_proto = dlm->fs_locking_proto;
1404
1405 /* copy live node map to join message */
1406 byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES);
1407
1408 status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
1409 sizeof(join_msg), node, &join_resp);
1410 if (status < 0 && status != -ENOPROTOOPT) {
1411 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1412 "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
1413 node);
1414 goto bail;
1415 }
1416 dlm_query_join_wire_to_packet(join_resp, &packet);
1417
1418 /* -ENOPROTOOPT from the net code means the other side isn't
1419 listening for our message type -- that's fine, it means
1420 his dlm isn't up, so we can consider him a 'yes' but not
1421 joined into the domain. */
1422 if (status == -ENOPROTOOPT) {
1423 status = 0;
1424 *response = JOIN_OK_NO_MAP;
1425 } else if (packet.code == JOIN_DISALLOW ||
1426 packet.code == JOIN_OK_NO_MAP) {
1427 *response = packet.code;
1428 } else if (packet.code == JOIN_PROTOCOL_MISMATCH) {
1429 mlog(ML_NOTICE,
1430 "This node requested DLM locking protocol %u.%u and "
1431 "filesystem locking protocol %u.%u. At least one of "
1432 "the protocol versions on node %d is not compatible, "
1433 "disconnecting\n",
1434 dlm->dlm_locking_proto.pv_major,
1435 dlm->dlm_locking_proto.pv_minor,
1436 dlm->fs_locking_proto.pv_major,
1437 dlm->fs_locking_proto.pv_minor,
1438 node);
1439 status = -EPROTO;
1440 *response = packet.code;
1441 } else if (packet.code == JOIN_OK) {
1442 *response = packet.code;
1443 /* Use the same locking protocol as the remote node */
1444 dlm->dlm_locking_proto.pv_minor = packet.dlm_minor;
1445 dlm->fs_locking_proto.pv_minor = packet.fs_minor;
1446 mlog(0,
1447 "Node %d responds JOIN_OK with DLM locking protocol "
1448 "%u.%u and fs locking protocol %u.%u\n",
1449 node,
1450 dlm->dlm_locking_proto.pv_major,
1451 dlm->dlm_locking_proto.pv_minor,
1452 dlm->fs_locking_proto.pv_major,
1453 dlm->fs_locking_proto.pv_minor);
1454 } else {
1455 status = -EINVAL;
1456 mlog(ML_ERROR, "invalid response %d from node %u\n",
1457 packet.code, node);
1458 }
1459
1460 mlog(0, "status %d, node %d response is %d\n", status, node,
1461 *response);
1462
1463 bail:
1464 return status;
1465 }
1466
1467 static int dlm_send_one_join_assert(struct dlm_ctxt *dlm,
1468 unsigned int node)
1469 {
1470 int status;
1471 struct dlm_assert_joined assert_msg;
1472
1473 mlog(0, "Sending join assert to node %u\n", node);
1474
1475 memset(&assert_msg, 0, sizeof(assert_msg));
1476 assert_msg.node_idx = dlm->node_num;
1477 assert_msg.name_len = strlen(dlm->name);
1478 memcpy(assert_msg.domain, dlm->name, assert_msg.name_len);
1479
1480 status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1481 &assert_msg, sizeof(assert_msg), node,
1482 NULL);
1483 if (status < 0)
1484 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1485 "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1486 node);
1487
1488 return status;
1489 }
1490
1491 static void dlm_send_join_asserts(struct dlm_ctxt *dlm,
1492 unsigned long *node_map)
1493 {
1494 int status, node, live;
1495
1496 status = 0;
1497 node = -1;
1498 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1499 node + 1)) < O2NM_MAX_NODES) {
1500 if (node == dlm->node_num)
1501 continue;
1502
1503 do {
1504 /* It is very important that this message be
1505 * received so we spin until either the node
1506 * has died or it gets the message. */
1507 status = dlm_send_one_join_assert(dlm, node);
1508
1509 spin_lock(&dlm->spinlock);
1510 live = test_bit(node, dlm->live_nodes_map);
1511 spin_unlock(&dlm->spinlock);
1512
1513 if (status) {
1514 mlog(ML_ERROR, "Error return %d asserting "
1515 "join on node %d\n", status, node);
1516
1517 /* give us some time between errors... */
1518 if (live)
1519 msleep(DLM_DOMAIN_BACKOFF_MS);
1520 }
1521 } while (status && live);
1522 }
1523 }
1524
1525 struct domain_join_ctxt {
1526 unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1527 unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1528 };
1529
1530 static int dlm_should_restart_join(struct dlm_ctxt *dlm,
1531 struct domain_join_ctxt *ctxt,
1532 enum dlm_query_join_response_code response)
1533 {
1534 int ret;
1535
1536 if (response == JOIN_DISALLOW) {
1537 mlog(0, "Latest response of disallow -- should restart\n");
1538 return 1;
1539 }
1540
1541 spin_lock(&dlm->spinlock);
1542 /* For now, we restart the process if the node maps have
1543 * changed at all */
1544 ret = memcmp(ctxt->live_map, dlm->live_nodes_map,
1545 sizeof(dlm->live_nodes_map));
1546 spin_unlock(&dlm->spinlock);
1547
1548 if (ret)
1549 mlog(0, "Node maps changed -- should restart\n");
1550
1551 return ret;
1552 }
1553
1554 static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
1555 {
1556 int status = 0, tmpstat, node;
1557 struct domain_join_ctxt *ctxt;
1558 enum dlm_query_join_response_code response = JOIN_DISALLOW;
1559
1560 mlog(0, "%p", dlm);
1561
1562 ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
1563 if (!ctxt) {
1564 status = -ENOMEM;
1565 mlog_errno(status);
1566 goto bail;
1567 }
1568
1569 /* group sem locking should work for us here -- we're already
1570 * registered for heartbeat events so filling this should be
1571 * atomic wrt getting those handlers called. */
1572 o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map));
1573
1574 spin_lock(&dlm->spinlock);
1575 memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map));
1576
1577 __dlm_set_joining_node(dlm, dlm->node_num);
1578
1579 spin_unlock(&dlm->spinlock);
1580
1581 node = -1;
1582 while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES,
1583 node + 1)) < O2NM_MAX_NODES) {
1584 if (node == dlm->node_num)
1585 continue;
1586
1587 status = dlm_request_join(dlm, node, &response);
1588 if (status < 0) {
1589 mlog_errno(status);
1590 goto bail;
1591 }
1592
1593 /* Ok, either we got a response or the node doesn't have a
1594 * dlm up. */
1595 if (response == JOIN_OK)
1596 set_bit(node, ctxt->yes_resp_map);
1597
1598 if (dlm_should_restart_join(dlm, ctxt, response)) {
1599 status = -EAGAIN;
1600 goto bail;
1601 }
1602 }
1603
1604 mlog(0, "Yay, done querying nodes!\n");
1605
1606 /* Yay, everyone agree's we can join the domain. My domain is
1607 * comprised of all nodes who were put in the
1608 * yes_resp_map. Copy that into our domain map and send a join
1609 * assert message to clean up everyone elses state. */
1610 spin_lock(&dlm->spinlock);
1611 memcpy(dlm->domain_map, ctxt->yes_resp_map,
1612 sizeof(ctxt->yes_resp_map));
1613 set_bit(dlm->node_num, dlm->domain_map);
1614 spin_unlock(&dlm->spinlock);
1615
1616 /* Support for global heartbeat and node info was added in 1.1 */
1617 if (dlm_protocol.pv_major > 1 || dlm_protocol.pv_minor > 0) {
1618 status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map);
1619 if (status) {
1620 mlog_errno(status);
1621 goto bail;
1622 }
1623 status = dlm_send_regions(dlm, ctxt->yes_resp_map);
1624 if (status) {
1625 mlog_errno(status);
1626 goto bail;
1627 }
1628 }
1629
1630 dlm_send_join_asserts(dlm, ctxt->yes_resp_map);
1631
1632 /* Joined state *must* be set before the joining node
1633 * information, otherwise the query_join handler may read no
1634 * current joiner but a state of NEW and tell joining nodes
1635 * we're not in the domain. */
1636 spin_lock(&dlm_domain_lock);
1637 dlm->dlm_state = DLM_CTXT_JOINED;
1638 dlm->num_joins++;
1639 spin_unlock(&dlm_domain_lock);
1640
1641 bail:
1642 spin_lock(&dlm->spinlock);
1643 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1644 if (!status)
1645 __dlm_print_nodes(dlm);
1646 spin_unlock(&dlm->spinlock);
1647
1648 if (ctxt) {
1649 /* Do we need to send a cancel message to any nodes? */
1650 if (status < 0) {
1651 tmpstat = dlm_send_join_cancels(dlm,
1652 ctxt->yes_resp_map,
1653 sizeof(ctxt->yes_resp_map));
1654 if (tmpstat < 0)
1655 mlog_errno(tmpstat);
1656 }
1657 kfree(ctxt);
1658 }
1659
1660 mlog(0, "returning %d\n", status);
1661 return status;
1662 }
1663
1664 static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm)
1665 {
1666 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up);
1667 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down);
1668 o2net_unregister_handler_list(&dlm->dlm_domain_handlers);
1669 }
1670
1671 static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
1672 {
1673 int status;
1674
1675 mlog(0, "registering handlers.\n");
1676
1677 o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB,
1678 dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI);
1679 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down);
1680 if (status)
1681 goto bail;
1682
1683 o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB,
1684 dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI);
1685 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up);
1686 if (status)
1687 goto bail;
1688
1689 status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key,
1690 sizeof(struct dlm_master_request),
1691 dlm_master_request_handler,
1692 dlm, NULL, &dlm->dlm_domain_handlers);
1693 if (status)
1694 goto bail;
1695
1696 status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
1697 sizeof(struct dlm_assert_master),
1698 dlm_assert_master_handler,
1699 dlm, dlm_assert_master_post_handler,
1700 &dlm->dlm_domain_handlers);
1701 if (status)
1702 goto bail;
1703
1704 status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key,
1705 sizeof(struct dlm_create_lock),
1706 dlm_create_lock_handler,
1707 dlm, NULL, &dlm->dlm_domain_handlers);
1708 if (status)
1709 goto bail;
1710
1711 status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key,
1712 DLM_CONVERT_LOCK_MAX_LEN,
1713 dlm_convert_lock_handler,
1714 dlm, NULL, &dlm->dlm_domain_handlers);
1715 if (status)
1716 goto bail;
1717
1718 status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key,
1719 DLM_UNLOCK_LOCK_MAX_LEN,
1720 dlm_unlock_lock_handler,
1721 dlm, NULL, &dlm->dlm_domain_handlers);
1722 if (status)
1723 goto bail;
1724
1725 status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key,
1726 DLM_PROXY_AST_MAX_LEN,
1727 dlm_proxy_ast_handler,
1728 dlm, NULL, &dlm->dlm_domain_handlers);
1729 if (status)
1730 goto bail;
1731
1732 status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key,
1733 sizeof(struct dlm_exit_domain),
1734 dlm_exit_domain_handler,
1735 dlm, NULL, &dlm->dlm_domain_handlers);
1736 if (status)
1737 goto bail;
1738
1739 status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key,
1740 sizeof(struct dlm_deref_lockres),
1741 dlm_deref_lockres_handler,
1742 dlm, NULL, &dlm->dlm_domain_handlers);
1743 if (status)
1744 goto bail;
1745
1746 status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key,
1747 sizeof(struct dlm_migrate_request),
1748 dlm_migrate_request_handler,
1749 dlm, NULL, &dlm->dlm_domain_handlers);
1750 if (status)
1751 goto bail;
1752
1753 status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key,
1754 DLM_MIG_LOCKRES_MAX_LEN,
1755 dlm_mig_lockres_handler,
1756 dlm, NULL, &dlm->dlm_domain_handlers);
1757 if (status)
1758 goto bail;
1759
1760 status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key,
1761 sizeof(struct dlm_master_requery),
1762 dlm_master_requery_handler,
1763 dlm, NULL, &dlm->dlm_domain_handlers);
1764 if (status)
1765 goto bail;
1766
1767 status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key,
1768 sizeof(struct dlm_lock_request),
1769 dlm_request_all_locks_handler,
1770 dlm, NULL, &dlm->dlm_domain_handlers);
1771 if (status)
1772 goto bail;
1773
1774 status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key,
1775 sizeof(struct dlm_reco_data_done),
1776 dlm_reco_data_done_handler,
1777 dlm, NULL, &dlm->dlm_domain_handlers);
1778 if (status)
1779 goto bail;
1780
1781 status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key,
1782 sizeof(struct dlm_begin_reco),
1783 dlm_begin_reco_handler,
1784 dlm, NULL, &dlm->dlm_domain_handlers);
1785 if (status)
1786 goto bail;
1787
1788 status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key,
1789 sizeof(struct dlm_finalize_reco),
1790 dlm_finalize_reco_handler,
1791 dlm, NULL, &dlm->dlm_domain_handlers);
1792 if (status)
1793 goto bail;
1794
1795 bail:
1796 if (status)
1797 dlm_unregister_domain_handlers(dlm);
1798
1799 return status;
1800 }
1801
1802 static int dlm_join_domain(struct dlm_ctxt *dlm)
1803 {
1804 int status;
1805 unsigned int backoff;
1806 unsigned int total_backoff = 0;
1807
1808 BUG_ON(!dlm);
1809
1810 mlog(0, "Join domain %s\n", dlm->name);
1811
1812 status = dlm_register_domain_handlers(dlm);
1813 if (status) {
1814 mlog_errno(status);
1815 goto bail;
1816 }
1817
1818 status = dlm_debug_init(dlm);
1819 if (status < 0) {
1820 mlog_errno(status);
1821 goto bail;
1822 }
1823
1824 status = dlm_launch_thread(dlm);
1825 if (status < 0) {
1826 mlog_errno(status);
1827 goto bail;
1828 }
1829
1830 status = dlm_launch_recovery_thread(dlm);
1831 if (status < 0) {
1832 mlog_errno(status);
1833 goto bail;
1834 }
1835
1836 dlm->dlm_worker = create_singlethread_workqueue("dlm_wq");
1837 if (!dlm->dlm_worker) {
1838 status = -ENOMEM;
1839 mlog_errno(status);
1840 goto bail;
1841 }
1842
1843 do {
1844 status = dlm_try_to_join_domain(dlm);
1845
1846 /* If we're racing another node to the join, then we
1847 * need to back off temporarily and let them
1848 * complete. */
1849 #define DLM_JOIN_TIMEOUT_MSECS 90000
1850 if (status == -EAGAIN) {
1851 if (signal_pending(current)) {
1852 status = -ERESTARTSYS;
1853 goto bail;
1854 }
1855
1856 if (total_backoff >
1857 msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS)) {
1858 status = -ERESTARTSYS;
1859 mlog(ML_NOTICE, "Timed out joining dlm domain "
1860 "%s after %u msecs\n", dlm->name,
1861 jiffies_to_msecs(total_backoff));
1862 goto bail;
1863 }
1864
1865 /*
1866 * <chip> After you!
1867 * <dale> No, after you!
1868 * <chip> I insist!
1869 * <dale> But you first!
1870 * ...
1871 */
1872 backoff = (unsigned int)(jiffies & 0x3);
1873 backoff *= DLM_DOMAIN_BACKOFF_MS;
1874 total_backoff += backoff;
1875 mlog(0, "backoff %d\n", backoff);
1876 msleep(backoff);
1877 }
1878 } while (status == -EAGAIN);
1879
1880 if (status < 0) {
1881 mlog_errno(status);
1882 goto bail;
1883 }
1884
1885 status = 0;
1886 bail:
1887 wake_up(&dlm_domain_events);
1888
1889 if (status) {
1890 dlm_unregister_domain_handlers(dlm);
1891 dlm_debug_shutdown(dlm);
1892 dlm_complete_thread(dlm);
1893 dlm_complete_recovery_thread(dlm);
1894 dlm_destroy_dlm_worker(dlm);
1895 }
1896
1897 return status;
1898 }
1899
1900 static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
1901 u32 key)
1902 {
1903 int i;
1904 int ret;
1905 struct dlm_ctxt *dlm = NULL;
1906
1907 dlm = kzalloc(sizeof(*dlm), GFP_KERNEL);
1908 if (!dlm) {
1909 mlog_errno(-ENOMEM);
1910 goto leave;
1911 }
1912
1913 dlm->name = kstrdup(domain, GFP_KERNEL);
1914 if (dlm->name == NULL) {
1915 mlog_errno(-ENOMEM);
1916 kfree(dlm);
1917 dlm = NULL;
1918 goto leave;
1919 }
1920
1921 dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
1922 if (!dlm->lockres_hash) {
1923 mlog_errno(-ENOMEM);
1924 kfree(dlm->name);
1925 kfree(dlm);
1926 dlm = NULL;
1927 goto leave;
1928 }
1929
1930 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1931 INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
1932
1933 dlm->master_hash = (struct hlist_head **)
1934 dlm_alloc_pagevec(DLM_HASH_PAGES);
1935 if (!dlm->master_hash) {
1936 mlog_errno(-ENOMEM);
1937 dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
1938 kfree(dlm->name);
1939 kfree(dlm);
1940 dlm = NULL;
1941 goto leave;
1942 }
1943
1944 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1945 INIT_HLIST_HEAD(dlm_master_hash(dlm, i));
1946
1947 dlm->key = key;
1948 dlm->node_num = o2nm_this_node();
1949
1950 ret = dlm_create_debugfs_subroot(dlm);
1951 if (ret < 0) {
1952 dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
1953 dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
1954 kfree(dlm->name);
1955 kfree(dlm);
1956 dlm = NULL;
1957 goto leave;
1958 }
1959
1960 spin_lock_init(&dlm->spinlock);
1961 spin_lock_init(&dlm->master_lock);
1962 spin_lock_init(&dlm->ast_lock);
1963 spin_lock_init(&dlm->track_lock);
1964 INIT_LIST_HEAD(&dlm->list);
1965 INIT_LIST_HEAD(&dlm->dirty_list);
1966 INIT_LIST_HEAD(&dlm->reco.resources);
1967 INIT_LIST_HEAD(&dlm->reco.received);
1968 INIT_LIST_HEAD(&dlm->reco.node_data);
1969 INIT_LIST_HEAD(&dlm->purge_list);
1970 INIT_LIST_HEAD(&dlm->dlm_domain_handlers);
1971 INIT_LIST_HEAD(&dlm->tracking_list);
1972 dlm->reco.state = 0;
1973
1974 INIT_LIST_HEAD(&dlm->pending_asts);
1975 INIT_LIST_HEAD(&dlm->pending_basts);
1976
1977 mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
1978 dlm->recovery_map, &(dlm->recovery_map[0]));
1979
1980 memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map));
1981 memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map));
1982 memset(dlm->domain_map, 0, sizeof(dlm->domain_map));
1983
1984 dlm->dlm_thread_task = NULL;
1985 dlm->dlm_reco_thread_task = NULL;
1986 dlm->dlm_worker = NULL;
1987 init_waitqueue_head(&dlm->dlm_thread_wq);
1988 init_waitqueue_head(&dlm->dlm_reco_thread_wq);
1989 init_waitqueue_head(&dlm->reco.event);
1990 init_waitqueue_head(&dlm->ast_wq);
1991 init_waitqueue_head(&dlm->migration_wq);
1992 INIT_LIST_HEAD(&dlm->mle_hb_events);
1993
1994 dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
1995 init_waitqueue_head(&dlm->dlm_join_events);
1996
1997 dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
1998 dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
1999
2000 atomic_set(&dlm->res_tot_count, 0);
2001 atomic_set(&dlm->res_cur_count, 0);
2002 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
2003 atomic_set(&dlm->mle_tot_count[i], 0);
2004 atomic_set(&dlm->mle_cur_count[i], 0);
2005 }
2006
2007 spin_lock_init(&dlm->work_lock);
2008 INIT_LIST_HEAD(&dlm->work_list);
2009 INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work);
2010
2011 kref_init(&dlm->dlm_refs);
2012 dlm->dlm_state = DLM_CTXT_NEW;
2013
2014 INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks);
2015
2016 mlog(0, "context init: refcount %u\n",
2017 atomic_read(&dlm->dlm_refs.refcount));
2018
2019 leave:
2020 return dlm;
2021 }
2022
2023 /*
2024 * Compare a requested locking protocol version against the current one.
2025 *
2026 * If the major numbers are different, they are incompatible.
2027 * If the current minor is greater than the request, they are incompatible.
2028 * If the current minor is less than or equal to the request, they are
2029 * compatible, and the requester should run at the current minor version.
2030 */
2031 static int dlm_protocol_compare(struct dlm_protocol_version *existing,
2032 struct dlm_protocol_version *request)
2033 {
2034 if (existing->pv_major != request->pv_major)
2035 return 1;
2036
2037 if (existing->pv_minor > request->pv_minor)
2038 return 1;
2039
2040 if (existing->pv_minor < request->pv_minor)
2041 request->pv_minor = existing->pv_minor;
2042
2043 return 0;
2044 }
2045
2046 /*
2047 * dlm_register_domain: one-time setup per "domain".
2048 *
2049 * The filesystem passes in the requested locking version via proto.
2050 * If registration was successful, proto will contain the negotiated
2051 * locking protocol.
2052 */
2053 struct dlm_ctxt * dlm_register_domain(const char *domain,
2054 u32 key,
2055 struct dlm_protocol_version *fs_proto)
2056 {
2057 int ret;
2058 struct dlm_ctxt *dlm = NULL;
2059 struct dlm_ctxt *new_ctxt = NULL;
2060
2061 if (strlen(domain) >= O2NM_MAX_NAME_LEN) {
2062 ret = -ENAMETOOLONG;
2063 mlog(ML_ERROR, "domain name length too long\n");
2064 goto leave;
2065 }
2066
2067 if (!o2hb_check_local_node_heartbeating()) {
2068 mlog(ML_ERROR, "the local node has not been configured, or is "
2069 "not heartbeating\n");
2070 ret = -EPROTO;
2071 goto leave;
2072 }
2073
2074 mlog(0, "register called for domain \"%s\"\n", domain);
2075
2076 retry:
2077 dlm = NULL;
2078 if (signal_pending(current)) {
2079 ret = -ERESTARTSYS;
2080 mlog_errno(ret);
2081 goto leave;
2082 }
2083
2084 spin_lock(&dlm_domain_lock);
2085
2086 dlm = __dlm_lookup_domain(domain);
2087 if (dlm) {
2088 if (dlm->dlm_state != DLM_CTXT_JOINED) {
2089 spin_unlock(&dlm_domain_lock);
2090
2091 mlog(0, "This ctxt is not joined yet!\n");
2092 wait_event_interruptible(dlm_domain_events,
2093 dlm_wait_on_domain_helper(
2094 domain));
2095 goto retry;
2096 }
2097
2098 if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
2099 spin_unlock(&dlm_domain_lock);
2100 mlog(ML_ERROR,
2101 "Requested locking protocol version is not "
2102 "compatible with already registered domain "
2103 "\"%s\"\n", domain);
2104 ret = -EPROTO;
2105 goto leave;
2106 }
2107
2108 __dlm_get(dlm);
2109 dlm->num_joins++;
2110
2111 spin_unlock(&dlm_domain_lock);
2112
2113 ret = 0;
2114 goto leave;
2115 }
2116
2117 /* doesn't exist */
2118 if (!new_ctxt) {
2119 spin_unlock(&dlm_domain_lock);
2120
2121 new_ctxt = dlm_alloc_ctxt(domain, key);
2122 if (new_ctxt)
2123 goto retry;
2124
2125 ret = -ENOMEM;
2126 mlog_errno(ret);
2127 goto leave;
2128 }
2129
2130 /* a little variable switch-a-roo here... */
2131 dlm = new_ctxt;
2132 new_ctxt = NULL;
2133
2134 /* add the new domain */
2135 list_add_tail(&dlm->list, &dlm_domains);
2136 spin_unlock(&dlm_domain_lock);
2137
2138 /*
2139 * Pass the locking protocol version into the join. If the join
2140 * succeeds, it will have the negotiated protocol set.
2141 */
2142 dlm->dlm_locking_proto = dlm_protocol;
2143 dlm->fs_locking_proto = *fs_proto;
2144
2145 ret = dlm_join_domain(dlm);
2146 if (ret) {
2147 mlog_errno(ret);
2148 dlm_put(dlm);
2149 goto leave;
2150 }
2151
2152 /* Tell the caller what locking protocol we negotiated */
2153 *fs_proto = dlm->fs_locking_proto;
2154
2155 ret = 0;
2156 leave:
2157 if (new_ctxt)
2158 dlm_free_ctxt_mem(new_ctxt);
2159
2160 if (ret < 0)
2161 dlm = ERR_PTR(ret);
2162
2163 return dlm;
2164 }
2165 EXPORT_SYMBOL_GPL(dlm_register_domain);
2166
2167 static LIST_HEAD(dlm_join_handlers);
2168
2169 static void dlm_unregister_net_handlers(void)
2170 {
2171 o2net_unregister_handler_list(&dlm_join_handlers);
2172 }
2173
2174 static int dlm_register_net_handlers(void)
2175 {
2176 int status = 0;
2177
2178 status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
2179 sizeof(struct dlm_query_join_request),
2180 dlm_query_join_handler,
2181 NULL, NULL, &dlm_join_handlers);
2182 if (status)
2183 goto bail;
2184
2185 status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
2186 sizeof(struct dlm_assert_joined),
2187 dlm_assert_joined_handler,
2188 NULL, NULL, &dlm_join_handlers);
2189 if (status)
2190 goto bail;
2191
2192 status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
2193 sizeof(struct dlm_cancel_join),
2194 dlm_cancel_join_handler,
2195 NULL, NULL, &dlm_join_handlers);
2196 if (status)
2197 goto bail;
2198
2199 status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY,
2200 sizeof(struct dlm_query_region),
2201 dlm_query_region_handler,
2202 NULL, NULL, &dlm_join_handlers);
2203
2204 if (status)
2205 goto bail;
2206
2207 status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
2208 sizeof(struct dlm_query_nodeinfo),
2209 dlm_query_nodeinfo_handler,
2210 NULL, NULL, &dlm_join_handlers);
2211 bail:
2212 if (status < 0)
2213 dlm_unregister_net_handlers();
2214
2215 return status;
2216 }
2217
2218 /* Domain eviction callback handling.
2219 *
2220 * The file system requires notification of node death *before* the
2221 * dlm completes it's recovery work, otherwise it may be able to
2222 * acquire locks on resources requiring recovery. Since the dlm can
2223 * evict a node from it's domain *before* heartbeat fires, a similar
2224 * mechanism is required. */
2225
2226 /* Eviction is not expected to happen often, so a per-domain lock is
2227 * not necessary. Eviction callbacks are allowed to sleep for short
2228 * periods of time. */
2229 static DECLARE_RWSEM(dlm_callback_sem);
2230
2231 void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
2232 int node_num)
2233 {
2234 struct list_head *iter;
2235 struct dlm_eviction_cb *cb;
2236
2237 down_read(&dlm_callback_sem);
2238 list_for_each(iter, &dlm->dlm_eviction_callbacks) {
2239 cb = list_entry(iter, struct dlm_eviction_cb, ec_item);
2240
2241 cb->ec_func(node_num, cb->ec_data);
2242 }
2243 up_read(&dlm_callback_sem);
2244 }
2245
2246 void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
2247 dlm_eviction_func *f,
2248 void *data)
2249 {
2250 INIT_LIST_HEAD(&cb->ec_item);
2251 cb->ec_func = f;
2252 cb->ec_data = data;
2253 }
2254 EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb);
2255
2256 void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
2257 struct dlm_eviction_cb *cb)
2258 {
2259 down_write(&dlm_callback_sem);
2260 list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks);
2261 up_write(&dlm_callback_sem);
2262 }
2263 EXPORT_SYMBOL_GPL(dlm_register_eviction_cb);
2264
2265 void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb)
2266 {
2267 down_write(&dlm_callback_sem);
2268 list_del_init(&cb->ec_item);
2269 up_write(&dlm_callback_sem);
2270 }
2271 EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb);
2272
2273 static int __init dlm_init(void)
2274 {
2275 int status;
2276
2277 dlm_print_version();
2278
2279 status = dlm_init_mle_cache();
2280 if (status) {
2281 mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n");
2282 goto error;
2283 }
2284
2285 status = dlm_init_master_caches();
2286 if (status) {
2287 mlog(ML_ERROR, "Could not create o2dlm_lockres and "
2288 "o2dlm_lockname slabcaches\n");
2289 goto error;
2290 }
2291
2292 status = dlm_init_lock_cache();
2293 if (status) {
2294 mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n");
2295 goto error;
2296 }
2297
2298 status = dlm_register_net_handlers();
2299 if (status) {
2300 mlog(ML_ERROR, "Unable to register network handlers\n");
2301 goto error;
2302 }
2303
2304 status = dlm_create_debugfs_root();
2305 if (status)
2306 goto error;
2307
2308 return 0;
2309 error:
2310 dlm_unregister_net_handlers();
2311 dlm_destroy_lock_cache();
2312 dlm_destroy_master_caches();
2313 dlm_destroy_mle_cache();
2314 return -1;
2315 }
2316
2317 static void __exit dlm_exit (void)
2318 {
2319 dlm_destroy_debugfs_root();
2320 dlm_unregister_net_handlers();
2321 dlm_destroy_lock_cache();
2322 dlm_destroy_master_caches();
2323 dlm_destroy_mle_cache();
2324 }
2325
2326 MODULE_AUTHOR("Oracle");
2327 MODULE_LICENSE("GPL");
2328
2329 module_init(dlm_init);
2330 module_exit(dlm_exit);
CRIS linux kernel tree