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Merge branch 'v6v7' into devel
[linux/fpc-iii.git] / fs / ocfs2 / dlm / dlmdomain.c
blob7e38a072d720275ecd6b89a5f5113d9bde11c308
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_entry("%.*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_entry("%.*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_entry("%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 {
931 char *local = NULL, *remote = qr->qr_regions;
932 char *l, *r;
933 int localnr, i, j, foundit;
934 int status = 0;
935
936 if (!o2hb_global_heartbeat_active()) {
937 if (qr->qr_numregions) {
938 mlog(ML_ERROR, "Domain %s: Joining node %d has global "
939 "heartbeat enabled but local node %d does not\n",
940 qr->qr_domain, qr->qr_node, dlm->node_num);
941 status = -EINVAL;
942 }
943 goto bail;
944 }
945
946 if (o2hb_global_heartbeat_active() && !qr->qr_numregions) {
947 mlog(ML_ERROR, "Domain %s: Local node %d has global "
948 "heartbeat enabled but joining node %d does not\n",
949 qr->qr_domain, dlm->node_num, qr->qr_node);
950 status = -EINVAL;
951 goto bail;
952 }
953
954 r = remote;
955 for (i = 0; i < qr->qr_numregions; ++i) {
956 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r);
957 r += O2HB_MAX_REGION_NAME_LEN;
958 }
959
960 local = kmalloc(sizeof(qr->qr_regions), GFP_ATOMIC);
961 if (!local) {
962 status = -ENOMEM;
963 goto bail;
964 }
965
966 localnr = o2hb_get_all_regions(local, O2NM_MAX_REGIONS);
967
968 /* compare local regions with remote */
969 l = local;
970 for (i = 0; i < localnr; ++i) {
971 foundit = 0;
972 r = remote;
973 for (j = 0; j <= qr->qr_numregions; ++j) {
974 if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) {
975 foundit = 1;
976 break;
977 }
978 r += O2HB_MAX_REGION_NAME_LEN;
979 }
980 if (!foundit) {
981 status = -EINVAL;
982 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
983 "in local node %d but not in joining node %d\n",
984 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l,
985 dlm->node_num, qr->qr_node);
986 goto bail;
987 }
988 l += O2HB_MAX_REGION_NAME_LEN;
989 }
990
991 /* compare remote with local regions */
992 r = remote;
993 for (i = 0; i < qr->qr_numregions; ++i) {
994 foundit = 0;
995 l = local;
996 for (j = 0; j < localnr; ++j) {
997 if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) {
998 foundit = 1;
999 break;
1000 }
1001 l += O2HB_MAX_REGION_NAME_LEN;
1002 }
1003 if (!foundit) {
1004 status = -EINVAL;
1005 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1006 "in joining node %d but not in local node %d\n",
1007 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r,
1008 qr->qr_node, dlm->node_num);
1009 goto bail;
1010 }
1011 r += O2HB_MAX_REGION_NAME_LEN;
1012 }
1013
1014 bail:
1015 kfree(local);
1016
1017 return status;
1018 }
1019
1020 static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map)
1021 {
1022 struct dlm_query_region *qr = NULL;
1023 int status, ret = 0, i;
1024 char *p;
1025
1026 if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
1027 goto bail;
1028
1029 qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL);
1030 if (!qr) {
1031 ret = -ENOMEM;
1032 mlog_errno(ret);
1033 goto bail;
1034 }
1035
1036 qr->qr_node = dlm->node_num;
1037 qr->qr_namelen = strlen(dlm->name);
1038 memcpy(qr->qr_domain, dlm->name, qr->qr_namelen);
1039 /* if local hb, the numregions will be zero */
1040 if (o2hb_global_heartbeat_active())
1041 qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions,
1042 O2NM_MAX_REGIONS);
1043
1044 p = qr->qr_regions;
1045 for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN)
1046 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p);
1047
1048 i = -1;
1049 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1050 i + 1)) < O2NM_MAX_NODES) {
1051 if (i == dlm->node_num)
1052 continue;
1053
1054 mlog(0, "Sending regions to node %d\n", i);
1055
1056 ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr,
1057 sizeof(struct dlm_query_region),
1058 i, &status);
1059 if (ret >= 0)
1060 ret = status;
1061 if (ret) {
1062 mlog(ML_ERROR, "Region mismatch %d, node %d\n",
1063 ret, i);
1064 break;
1065 }
1066 }
1067
1068 bail:
1069 kfree(qr);
1070 return ret;
1071 }
1072
1073 static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
1074 void *data, void **ret_data)
1075 {
1076 struct dlm_query_region *qr;
1077 struct dlm_ctxt *dlm = NULL;
1078 int status = 0;
1079 int locked = 0;
1080
1081 qr = (struct dlm_query_region *) msg->buf;
1082
1083 mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node,
1084 qr->qr_domain);
1085
1086 status = -EINVAL;
1087
1088 spin_lock(&dlm_domain_lock);
1089 dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen);
1090 if (!dlm) {
1091 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1092 "before join domain\n", qr->qr_node, qr->qr_domain);
1093 goto bail;
1094 }
1095
1096 spin_lock(&dlm->spinlock);
1097 locked = 1;
1098 if (dlm->joining_node != qr->qr_node) {
1099 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1100 "but joining node is %d\n", qr->qr_node, qr->qr_domain,
1101 dlm->joining_node);
1102 goto bail;
1103 }
1104
1105 /* Support for global heartbeat was added in 1.1 */
1106 if (dlm->dlm_locking_proto.pv_major == 1 &&
1107 dlm->dlm_locking_proto.pv_minor == 0) {
1108 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1109 "but active dlm protocol is %d.%d\n", qr->qr_node,
1110 qr->qr_domain, dlm->dlm_locking_proto.pv_major,
1111 dlm->dlm_locking_proto.pv_minor);
1112 goto bail;
1113 }
1114
1115 status = dlm_match_regions(dlm, qr);
1116
1117 bail:
1118 if (locked)
1119 spin_unlock(&dlm->spinlock);
1120 spin_unlock(&dlm_domain_lock);
1121
1122 return status;
1123 }
1124
1125 static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn)
1126 {
1127 struct o2nm_node *local;
1128 struct dlm_node_info *remote;
1129 int i, j;
1130 int status = 0;
1131
1132 for (j = 0; j < qn->qn_numnodes; ++j)
1133 mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum,
1134 &(qn->qn_nodes[j].ni_ipv4_address),
1135 ntohs(qn->qn_nodes[j].ni_ipv4_port));
1136
1137 for (i = 0; i < O2NM_MAX_NODES && !status; ++i) {
1138 local = o2nm_get_node_by_num(i);
1139 remote = NULL;
1140 for (j = 0; j < qn->qn_numnodes; ++j) {
1141 if (qn->qn_nodes[j].ni_nodenum == i) {
1142 remote = &(qn->qn_nodes[j]);
1143 break;
1144 }
1145 }
1146
1147 if (!local && !remote)
1148 continue;
1149
1150 if ((local && !remote) || (!local && remote))
1151 status = -EINVAL;
1152
1153 if (!status &&
1154 ((remote->ni_nodenum != local->nd_num) ||
1155 (remote->ni_ipv4_port != local->nd_ipv4_port) ||
1156 (remote->ni_ipv4_address != local->nd_ipv4_address)))
1157 status = -EINVAL;
1158
1159 if (status) {
1160 if (remote && !local)
1161 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1162 "registered in joining node %d but not in "
1163 "local node %d\n", qn->qn_domain,
1164 remote->ni_nodenum,
1165 &(remote->ni_ipv4_address),
1166 ntohs(remote->ni_ipv4_port),
1167 qn->qn_nodenum, dlm->node_num);
1168 if (local && !remote)
1169 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1170 "registered in local node %d but not in "
1171 "joining node %d\n", qn->qn_domain,
1172 local->nd_num, &(local->nd_ipv4_address),
1173 ntohs(local->nd_ipv4_port),
1174 dlm->node_num, qn->qn_nodenum);
1175 BUG_ON((!local && !remote));
1176 }
1177
1178 if (local)
1179 o2nm_node_put(local);
1180 }
1181
1182 return status;
1183 }
1184
1185 static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map)
1186 {
1187 struct dlm_query_nodeinfo *qn = NULL;
1188 struct o2nm_node *node;
1189 int ret = 0, status, count, i;
1190
1191 if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
1192 goto bail;
1193
1194 qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL);
1195 if (!qn) {
1196 ret = -ENOMEM;
1197 mlog_errno(ret);
1198 goto bail;
1199 }
1200
1201 for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) {
1202 node = o2nm_get_node_by_num(i);
1203 if (!node)
1204 continue;
1205 qn->qn_nodes[count].ni_nodenum = node->nd_num;
1206 qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port;
1207 qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address;
1208 mlog(0, "Node %3d, %pI4:%u\n", node->nd_num,
1209 &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port));
1210 ++count;
1211 o2nm_node_put(node);
1212 }
1213
1214 qn->qn_nodenum = dlm->node_num;
1215 qn->qn_numnodes = count;
1216 qn->qn_namelen = strlen(dlm->name);
1217 memcpy(qn->qn_domain, dlm->name, qn->qn_namelen);
1218
1219 i = -1;
1220 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1221 i + 1)) < O2NM_MAX_NODES) {
1222 if (i == dlm->node_num)
1223 continue;
1224
1225 mlog(0, "Sending nodeinfo to node %d\n", i);
1226
1227 ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
1228 qn, sizeof(struct dlm_query_nodeinfo),
1229 i, &status);
1230 if (ret >= 0)
1231 ret = status;
1232 if (ret) {
1233 mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i);
1234 break;
1235 }
1236 }
1237
1238 bail:
1239 kfree(qn);
1240 return ret;
1241 }
1242
1243 static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len,
1244 void *data, void **ret_data)
1245 {
1246 struct dlm_query_nodeinfo *qn;
1247 struct dlm_ctxt *dlm = NULL;
1248 int locked = 0, status = -EINVAL;
1249
1250 qn = (struct dlm_query_nodeinfo *) msg->buf;
1251
1252 mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum,
1253 qn->qn_domain);
1254
1255 spin_lock(&dlm_domain_lock);
1256 dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen);
1257 if (!dlm) {
1258 mlog(ML_ERROR, "Node %d queried nodes on domain %s before "
1259 "join domain\n", qn->qn_nodenum, qn->qn_domain);
1260 goto bail;
1261 }
1262
1263 spin_lock(&dlm->spinlock);
1264 locked = 1;
1265 if (dlm->joining_node != qn->qn_nodenum) {
1266 mlog(ML_ERROR, "Node %d queried nodes on domain %s but "
1267 "joining node is %d\n", qn->qn_nodenum, qn->qn_domain,
1268 dlm->joining_node);
1269 goto bail;
1270 }
1271
1272 /* Support for node query was added in 1.1 */
1273 if (dlm->dlm_locking_proto.pv_major == 1 &&
1274 dlm->dlm_locking_proto.pv_minor == 0) {
1275 mlog(ML_ERROR, "Node %d queried nodes on domain %s "
1276 "but active dlm protocol is %d.%d\n", qn->qn_nodenum,
1277 qn->qn_domain, dlm->dlm_locking_proto.pv_major,
1278 dlm->dlm_locking_proto.pv_minor);
1279 goto bail;
1280 }
1281
1282 status = dlm_match_nodes(dlm, qn);
1283
1284 bail:
1285 if (locked)
1286 spin_unlock(&dlm->spinlock);
1287 spin_unlock(&dlm_domain_lock);
1288
1289 return status;
1290 }
1291
1292 static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
1293 void **ret_data)
1294 {
1295 struct dlm_cancel_join *cancel;
1296 struct dlm_ctxt *dlm = NULL;
1297
1298 cancel = (struct dlm_cancel_join *) msg->buf;
1299
1300 mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx,
1301 cancel->domain);
1302
1303 spin_lock(&dlm_domain_lock);
1304 dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len);
1305
1306 if (dlm) {
1307 spin_lock(&dlm->spinlock);
1308
1309 /* Yikes, this guy wants to cancel his join. No
1310 * problem, we simply cleanup our join state. */
1311 BUG_ON(dlm->joining_node != cancel->node_idx);
1312 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1313
1314 spin_unlock(&dlm->spinlock);
1315 }
1316 spin_unlock(&dlm_domain_lock);
1317
1318 return 0;
1319 }
1320
1321 static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm,
1322 unsigned int node)
1323 {
1324 int status;
1325 struct dlm_cancel_join cancel_msg;
1326
1327 memset(&cancel_msg, 0, sizeof(cancel_msg));
1328 cancel_msg.node_idx = dlm->node_num;
1329 cancel_msg.name_len = strlen(dlm->name);
1330 memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len);
1331
1332 status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1333 &cancel_msg, sizeof(cancel_msg), node,
1334 NULL);
1335 if (status < 0) {
1336 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1337 "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1338 node);
1339 goto bail;
1340 }
1341
1342 bail:
1343 return status;
1344 }
1345
1346 /* map_size should be in bytes. */
1347 static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
1348 unsigned long *node_map,
1349 unsigned int map_size)
1350 {
1351 int status, tmpstat;
1352 unsigned int node;
1353
1354 if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) *
1355 sizeof(unsigned long))) {
1356 mlog(ML_ERROR,
1357 "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
1358 map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES));
1359 return -EINVAL;
1360 }
1361
1362 status = 0;
1363 node = -1;
1364 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1365 node + 1)) < O2NM_MAX_NODES) {
1366 if (node == dlm->node_num)
1367 continue;
1368
1369 tmpstat = dlm_send_one_join_cancel(dlm, node);
1370 if (tmpstat) {
1371 mlog(ML_ERROR, "Error return %d cancelling join on "
1372 "node %d\n", tmpstat, node);
1373 if (!status)
1374 status = tmpstat;
1375 }
1376 }
1377
1378 if (status)
1379 mlog_errno(status);
1380 return status;
1381 }
1382
1383 static int dlm_request_join(struct dlm_ctxt *dlm,
1384 int node,
1385 enum dlm_query_join_response_code *response)
1386 {
1387 int status;
1388 struct dlm_query_join_request join_msg;
1389 struct dlm_query_join_packet packet;
1390 u32 join_resp;
1391
1392 mlog(0, "querying node %d\n", node);
1393
1394 memset(&join_msg, 0, sizeof(join_msg));
1395 join_msg.node_idx = dlm->node_num;
1396 join_msg.name_len = strlen(dlm->name);
1397 memcpy(join_msg.domain, dlm->name, join_msg.name_len);
1398 join_msg.dlm_proto = dlm->dlm_locking_proto;
1399 join_msg.fs_proto = dlm->fs_locking_proto;
1400
1401 /* copy live node map to join message */
1402 byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES);
1403
1404 status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
1405 sizeof(join_msg), node, &join_resp);
1406 if (status < 0 && status != -ENOPROTOOPT) {
1407 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1408 "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
1409 node);
1410 goto bail;
1411 }
1412 dlm_query_join_wire_to_packet(join_resp, &packet);
1413
1414 /* -ENOPROTOOPT from the net code means the other side isn't
1415 listening for our message type -- that's fine, it means
1416 his dlm isn't up, so we can consider him a 'yes' but not
1417 joined into the domain. */
1418 if (status == -ENOPROTOOPT) {
1419 status = 0;
1420 *response = JOIN_OK_NO_MAP;
1421 } else if (packet.code == JOIN_DISALLOW ||
1422 packet.code == JOIN_OK_NO_MAP) {
1423 *response = packet.code;
1424 } else if (packet.code == JOIN_PROTOCOL_MISMATCH) {
1425 mlog(ML_NOTICE,
1426 "This node requested DLM locking protocol %u.%u and "
1427 "filesystem locking protocol %u.%u. At least one of "
1428 "the protocol versions on node %d is not compatible, "
1429 "disconnecting\n",
1430 dlm->dlm_locking_proto.pv_major,
1431 dlm->dlm_locking_proto.pv_minor,
1432 dlm->fs_locking_proto.pv_major,
1433 dlm->fs_locking_proto.pv_minor,
1434 node);
1435 status = -EPROTO;
1436 *response = packet.code;
1437 } else if (packet.code == JOIN_OK) {
1438 *response = packet.code;
1439 /* Use the same locking protocol as the remote node */
1440 dlm->dlm_locking_proto.pv_minor = packet.dlm_minor;
1441 dlm->fs_locking_proto.pv_minor = packet.fs_minor;
1442 mlog(0,
1443 "Node %d responds JOIN_OK with DLM locking protocol "
1444 "%u.%u and fs locking protocol %u.%u\n",
1445 node,
1446 dlm->dlm_locking_proto.pv_major,
1447 dlm->dlm_locking_proto.pv_minor,
1448 dlm->fs_locking_proto.pv_major,
1449 dlm->fs_locking_proto.pv_minor);
1450 } else {
1451 status = -EINVAL;
1452 mlog(ML_ERROR, "invalid response %d from node %u\n",
1453 packet.code, node);
1454 }
1455
1456 mlog(0, "status %d, node %d response is %d\n", status, node,
1457 *response);
1458
1459 bail:
1460 return status;
1461 }
1462
1463 static int dlm_send_one_join_assert(struct dlm_ctxt *dlm,
1464 unsigned int node)
1465 {
1466 int status;
1467 struct dlm_assert_joined assert_msg;
1468
1469 mlog(0, "Sending join assert to node %u\n", node);
1470
1471 memset(&assert_msg, 0, sizeof(assert_msg));
1472 assert_msg.node_idx = dlm->node_num;
1473 assert_msg.name_len = strlen(dlm->name);
1474 memcpy(assert_msg.domain, dlm->name, assert_msg.name_len);
1475
1476 status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1477 &assert_msg, sizeof(assert_msg), node,
1478 NULL);
1479 if (status < 0)
1480 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1481 "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1482 node);
1483
1484 return status;
1485 }
1486
1487 static void dlm_send_join_asserts(struct dlm_ctxt *dlm,
1488 unsigned long *node_map)
1489 {
1490 int status, node, live;
1491
1492 status = 0;
1493 node = -1;
1494 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1495 node + 1)) < O2NM_MAX_NODES) {
1496 if (node == dlm->node_num)
1497 continue;
1498
1499 do {
1500 /* It is very important that this message be
1501 * received so we spin until either the node
1502 * has died or it gets the message. */
1503 status = dlm_send_one_join_assert(dlm, node);
1504
1505 spin_lock(&dlm->spinlock);
1506 live = test_bit(node, dlm->live_nodes_map);
1507 spin_unlock(&dlm->spinlock);
1508
1509 if (status) {
1510 mlog(ML_ERROR, "Error return %d asserting "
1511 "join on node %d\n", status, node);
1512
1513 /* give us some time between errors... */
1514 if (live)
1515 msleep(DLM_DOMAIN_BACKOFF_MS);
1516 }
1517 } while (status && live);
1518 }
1519 }
1520
1521 struct domain_join_ctxt {
1522 unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1523 unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1524 };
1525
1526 static int dlm_should_restart_join(struct dlm_ctxt *dlm,
1527 struct domain_join_ctxt *ctxt,
1528 enum dlm_query_join_response_code response)
1529 {
1530 int ret;
1531
1532 if (response == JOIN_DISALLOW) {
1533 mlog(0, "Latest response of disallow -- should restart\n");
1534 return 1;
1535 }
1536
1537 spin_lock(&dlm->spinlock);
1538 /* For now, we restart the process if the node maps have
1539 * changed at all */
1540 ret = memcmp(ctxt->live_map, dlm->live_nodes_map,
1541 sizeof(dlm->live_nodes_map));
1542 spin_unlock(&dlm->spinlock);
1543
1544 if (ret)
1545 mlog(0, "Node maps changed -- should restart\n");
1546
1547 return ret;
1548 }
1549
1550 static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
1551 {
1552 int status = 0, tmpstat, node;
1553 struct domain_join_ctxt *ctxt;
1554 enum dlm_query_join_response_code response = JOIN_DISALLOW;
1555
1556 mlog_entry("%p", dlm);
1557
1558 ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
1559 if (!ctxt) {
1560 status = -ENOMEM;
1561 mlog_errno(status);
1562 goto bail;
1563 }
1564
1565 /* group sem locking should work for us here -- we're already
1566 * registered for heartbeat events so filling this should be
1567 * atomic wrt getting those handlers called. */
1568 o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map));
1569
1570 spin_lock(&dlm->spinlock);
1571 memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map));
1572
1573 __dlm_set_joining_node(dlm, dlm->node_num);
1574
1575 spin_unlock(&dlm->spinlock);
1576
1577 node = -1;
1578 while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES,
1579 node + 1)) < O2NM_MAX_NODES) {
1580 if (node == dlm->node_num)
1581 continue;
1582
1583 status = dlm_request_join(dlm, node, &response);
1584 if (status < 0) {
1585 mlog_errno(status);
1586 goto bail;
1587 }
1588
1589 /* Ok, either we got a response or the node doesn't have a
1590 * dlm up. */
1591 if (response == JOIN_OK)
1592 set_bit(node, ctxt->yes_resp_map);
1593
1594 if (dlm_should_restart_join(dlm, ctxt, response)) {
1595 status = -EAGAIN;
1596 goto bail;
1597 }
1598 }
1599
1600 mlog(0, "Yay, done querying nodes!\n");
1601
1602 /* Yay, everyone agree's we can join the domain. My domain is
1603 * comprised of all nodes who were put in the
1604 * yes_resp_map. Copy that into our domain map and send a join
1605 * assert message to clean up everyone elses state. */
1606 spin_lock(&dlm->spinlock);
1607 memcpy(dlm->domain_map, ctxt->yes_resp_map,
1608 sizeof(ctxt->yes_resp_map));
1609 set_bit(dlm->node_num, dlm->domain_map);
1610 spin_unlock(&dlm->spinlock);
1611
1612 /* Support for global heartbeat and node info was added in 1.1 */
1613 if (dlm_protocol.pv_major > 1 || dlm_protocol.pv_minor > 0) {
1614 status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map);
1615 if (status) {
1616 mlog_errno(status);
1617 goto bail;
1618 }
1619 status = dlm_send_regions(dlm, ctxt->yes_resp_map);
1620 if (status) {
1621 mlog_errno(status);
1622 goto bail;
1623 }
1624 }
1625
1626 dlm_send_join_asserts(dlm, ctxt->yes_resp_map);
1627
1628 /* Joined state *must* be set before the joining node
1629 * information, otherwise the query_join handler may read no
1630 * current joiner but a state of NEW and tell joining nodes
1631 * we're not in the domain. */
1632 spin_lock(&dlm_domain_lock);
1633 dlm->dlm_state = DLM_CTXT_JOINED;
1634 dlm->num_joins++;
1635 spin_unlock(&dlm_domain_lock);
1636
1637 bail:
1638 spin_lock(&dlm->spinlock);
1639 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1640 if (!status)
1641 __dlm_print_nodes(dlm);
1642 spin_unlock(&dlm->spinlock);
1643
1644 if (ctxt) {
1645 /* Do we need to send a cancel message to any nodes? */
1646 if (status < 0) {
1647 tmpstat = dlm_send_join_cancels(dlm,
1648 ctxt->yes_resp_map,
1649 sizeof(ctxt->yes_resp_map));
1650 if (tmpstat < 0)
1651 mlog_errno(tmpstat);
1652 }
1653 kfree(ctxt);
1654 }
1655
1656 mlog(0, "returning %d\n", status);
1657 return status;
1658 }
1659
1660 static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm)
1661 {
1662 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up);
1663 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down);
1664 o2net_unregister_handler_list(&dlm->dlm_domain_handlers);
1665 }
1666
1667 static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
1668 {
1669 int status;
1670
1671 mlog(0, "registering handlers.\n");
1672
1673 o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB,
1674 dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI);
1675 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down);
1676 if (status)
1677 goto bail;
1678
1679 o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB,
1680 dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI);
1681 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up);
1682 if (status)
1683 goto bail;
1684
1685 status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key,
1686 sizeof(struct dlm_master_request),
1687 dlm_master_request_handler,
1688 dlm, NULL, &dlm->dlm_domain_handlers);
1689 if (status)
1690 goto bail;
1691
1692 status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
1693 sizeof(struct dlm_assert_master),
1694 dlm_assert_master_handler,
1695 dlm, dlm_assert_master_post_handler,
1696 &dlm->dlm_domain_handlers);
1697 if (status)
1698 goto bail;
1699
1700 status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key,
1701 sizeof(struct dlm_create_lock),
1702 dlm_create_lock_handler,
1703 dlm, NULL, &dlm->dlm_domain_handlers);
1704 if (status)
1705 goto bail;
1706
1707 status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key,
1708 DLM_CONVERT_LOCK_MAX_LEN,
1709 dlm_convert_lock_handler,
1710 dlm, NULL, &dlm->dlm_domain_handlers);
1711 if (status)
1712 goto bail;
1713
1714 status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key,
1715 DLM_UNLOCK_LOCK_MAX_LEN,
1716 dlm_unlock_lock_handler,
1717 dlm, NULL, &dlm->dlm_domain_handlers);
1718 if (status)
1719 goto bail;
1720
1721 status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key,
1722 DLM_PROXY_AST_MAX_LEN,
1723 dlm_proxy_ast_handler,
1724 dlm, NULL, &dlm->dlm_domain_handlers);
1725 if (status)
1726 goto bail;
1727
1728 status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key,
1729 sizeof(struct dlm_exit_domain),
1730 dlm_exit_domain_handler,
1731 dlm, NULL, &dlm->dlm_domain_handlers);
1732 if (status)
1733 goto bail;
1734
1735 status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key,
1736 sizeof(struct dlm_deref_lockres),
1737 dlm_deref_lockres_handler,
1738 dlm, NULL, &dlm->dlm_domain_handlers);
1739 if (status)
1740 goto bail;
1741
1742 status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key,
1743 sizeof(struct dlm_migrate_request),
1744 dlm_migrate_request_handler,
1745 dlm, NULL, &dlm->dlm_domain_handlers);
1746 if (status)
1747 goto bail;
1748
1749 status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key,
1750 DLM_MIG_LOCKRES_MAX_LEN,
1751 dlm_mig_lockres_handler,
1752 dlm, NULL, &dlm->dlm_domain_handlers);
1753 if (status)
1754 goto bail;
1755
1756 status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key,
1757 sizeof(struct dlm_master_requery),
1758 dlm_master_requery_handler,
1759 dlm, NULL, &dlm->dlm_domain_handlers);
1760 if (status)
1761 goto bail;
1762
1763 status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key,
1764 sizeof(struct dlm_lock_request),
1765 dlm_request_all_locks_handler,
1766 dlm, NULL, &dlm->dlm_domain_handlers);
1767 if (status)
1768 goto bail;
1769
1770 status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key,
1771 sizeof(struct dlm_reco_data_done),
1772 dlm_reco_data_done_handler,
1773 dlm, NULL, &dlm->dlm_domain_handlers);
1774 if (status)
1775 goto bail;
1776
1777 status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key,
1778 sizeof(struct dlm_begin_reco),
1779 dlm_begin_reco_handler,
1780 dlm, NULL, &dlm->dlm_domain_handlers);
1781 if (status)
1782 goto bail;
1783
1784 status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key,
1785 sizeof(struct dlm_finalize_reco),
1786 dlm_finalize_reco_handler,
1787 dlm, NULL, &dlm->dlm_domain_handlers);
1788 if (status)
1789 goto bail;
1790
1791 bail:
1792 if (status)
1793 dlm_unregister_domain_handlers(dlm);
1794
1795 return status;
1796 }
1797
1798 static int dlm_join_domain(struct dlm_ctxt *dlm)
1799 {
1800 int status;
1801 unsigned int backoff;
1802 unsigned int total_backoff = 0;
1803
1804 BUG_ON(!dlm);
1805
1806 mlog(0, "Join domain %s\n", dlm->name);
1807
1808 status = dlm_register_domain_handlers(dlm);
1809 if (status) {
1810 mlog_errno(status);
1811 goto bail;
1812 }
1813
1814 status = dlm_debug_init(dlm);
1815 if (status < 0) {
1816 mlog_errno(status);
1817 goto bail;
1818 }
1819
1820 status = dlm_launch_thread(dlm);
1821 if (status < 0) {
1822 mlog_errno(status);
1823 goto bail;
1824 }
1825
1826 status = dlm_launch_recovery_thread(dlm);
1827 if (status < 0) {
1828 mlog_errno(status);
1829 goto bail;
1830 }
1831
1832 dlm->dlm_worker = create_singlethread_workqueue("dlm_wq");
1833 if (!dlm->dlm_worker) {
1834 status = -ENOMEM;
1835 mlog_errno(status);
1836 goto bail;
1837 }
1838
1839 do {
1840 status = dlm_try_to_join_domain(dlm);
1841
1842 /* If we're racing another node to the join, then we
1843 * need to back off temporarily and let them
1844 * complete. */
1845 #define DLM_JOIN_TIMEOUT_MSECS 90000
1846 if (status == -EAGAIN) {
1847 if (signal_pending(current)) {
1848 status = -ERESTARTSYS;
1849 goto bail;
1850 }
1851
1852 if (total_backoff >
1853 msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS)) {
1854 status = -ERESTARTSYS;
1855 mlog(ML_NOTICE, "Timed out joining dlm domain "
1856 "%s after %u msecs\n", dlm->name,
1857 jiffies_to_msecs(total_backoff));
1858 goto bail;
1859 }
1860
1861 /*
1862 * <chip> After you!
1863 * <dale> No, after you!
1864 * <chip> I insist!
1865 * <dale> But you first!
1866 * ...
1867 */
1868 backoff = (unsigned int)(jiffies & 0x3);
1869 backoff *= DLM_DOMAIN_BACKOFF_MS;
1870 total_backoff += backoff;
1871 mlog(0, "backoff %d\n", backoff);
1872 msleep(backoff);
1873 }
1874 } while (status == -EAGAIN);
1875
1876 if (status < 0) {
1877 mlog_errno(status);
1878 goto bail;
1879 }
1880
1881 status = 0;
1882 bail:
1883 wake_up(&dlm_domain_events);
1884
1885 if (status) {
1886 dlm_unregister_domain_handlers(dlm);
1887 dlm_debug_shutdown(dlm);
1888 dlm_complete_thread(dlm);
1889 dlm_complete_recovery_thread(dlm);
1890 dlm_destroy_dlm_worker(dlm);
1891 }
1892
1893 return status;
1894 }
1895
1896 static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
1897 u32 key)
1898 {
1899 int i;
1900 int ret;
1901 struct dlm_ctxt *dlm = NULL;
1902
1903 dlm = kzalloc(sizeof(*dlm), GFP_KERNEL);
1904 if (!dlm) {
1905 mlog_errno(-ENOMEM);
1906 goto leave;
1907 }
1908
1909 dlm->name = kstrdup(domain, GFP_KERNEL);
1910 if (dlm->name == NULL) {
1911 mlog_errno(-ENOMEM);
1912 kfree(dlm);
1913 dlm = NULL;
1914 goto leave;
1915 }
1916
1917 dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
1918 if (!dlm->lockres_hash) {
1919 mlog_errno(-ENOMEM);
1920 kfree(dlm->name);
1921 kfree(dlm);
1922 dlm = NULL;
1923 goto leave;
1924 }
1925
1926 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1927 INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
1928
1929 dlm->master_hash = (struct hlist_head **)
1930 dlm_alloc_pagevec(DLM_HASH_PAGES);
1931 if (!dlm->master_hash) {
1932 mlog_errno(-ENOMEM);
1933 dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
1934 kfree(dlm->name);
1935 kfree(dlm);
1936 dlm = NULL;
1937 goto leave;
1938 }
1939
1940 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1941 INIT_HLIST_HEAD(dlm_master_hash(dlm, i));
1942
1943 dlm->key = key;
1944 dlm->node_num = o2nm_this_node();
1945
1946 ret = dlm_create_debugfs_subroot(dlm);
1947 if (ret < 0) {
1948 dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
1949 dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
1950 kfree(dlm->name);
1951 kfree(dlm);
1952 dlm = NULL;
1953 goto leave;
1954 }
1955
1956 spin_lock_init(&dlm->spinlock);
1957 spin_lock_init(&dlm->master_lock);
1958 spin_lock_init(&dlm->ast_lock);
1959 spin_lock_init(&dlm->track_lock);
1960 INIT_LIST_HEAD(&dlm->list);
1961 INIT_LIST_HEAD(&dlm->dirty_list);
1962 INIT_LIST_HEAD(&dlm->reco.resources);
1963 INIT_LIST_HEAD(&dlm->reco.received);
1964 INIT_LIST_HEAD(&dlm->reco.node_data);
1965 INIT_LIST_HEAD(&dlm->purge_list);
1966 INIT_LIST_HEAD(&dlm->dlm_domain_handlers);
1967 INIT_LIST_HEAD(&dlm->tracking_list);
1968 dlm->reco.state = 0;
1969
1970 INIT_LIST_HEAD(&dlm->pending_asts);
1971 INIT_LIST_HEAD(&dlm->pending_basts);
1972
1973 mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
1974 dlm->recovery_map, &(dlm->recovery_map[0]));
1975
1976 memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map));
1977 memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map));
1978 memset(dlm->domain_map, 0, sizeof(dlm->domain_map));
1979
1980 dlm->dlm_thread_task = NULL;
1981 dlm->dlm_reco_thread_task = NULL;
1982 dlm->dlm_worker = NULL;
1983 init_waitqueue_head(&dlm->dlm_thread_wq);
1984 init_waitqueue_head(&dlm->dlm_reco_thread_wq);
1985 init_waitqueue_head(&dlm->reco.event);
1986 init_waitqueue_head(&dlm->ast_wq);
1987 init_waitqueue_head(&dlm->migration_wq);
1988 INIT_LIST_HEAD(&dlm->mle_hb_events);
1989
1990 dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
1991 init_waitqueue_head(&dlm->dlm_join_events);
1992
1993 dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
1994 dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
1995
1996 atomic_set(&dlm->res_tot_count, 0);
1997 atomic_set(&dlm->res_cur_count, 0);
1998 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
1999 atomic_set(&dlm->mle_tot_count[i], 0);
2000 atomic_set(&dlm->mle_cur_count[i], 0);
2001 }
2002
2003 spin_lock_init(&dlm->work_lock);
2004 INIT_LIST_HEAD(&dlm->work_list);
2005 INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work);
2006
2007 kref_init(&dlm->dlm_refs);
2008 dlm->dlm_state = DLM_CTXT_NEW;
2009
2010 INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks);
2011
2012 mlog(0, "context init: refcount %u\n",
2013 atomic_read(&dlm->dlm_refs.refcount));
2014
2015 leave:
2016 return dlm;
2017 }
2018
2019 /*
2020 * Compare a requested locking protocol version against the current one.
2021 *
2022 * If the major numbers are different, they are incompatible.
2023 * If the current minor is greater than the request, they are incompatible.
2024 * If the current minor is less than or equal to the request, they are
2025 * compatible, and the requester should run at the current minor version.
2026 */
2027 static int dlm_protocol_compare(struct dlm_protocol_version *existing,
2028 struct dlm_protocol_version *request)
2029 {
2030 if (existing->pv_major != request->pv_major)
2031 return 1;
2032
2033 if (existing->pv_minor > request->pv_minor)
2034 return 1;
2035
2036 if (existing->pv_minor < request->pv_minor)
2037 request->pv_minor = existing->pv_minor;
2038
2039 return 0;
2040 }
2041
2042 /*
2043 * dlm_register_domain: one-time setup per "domain".
2044 *
2045 * The filesystem passes in the requested locking version via proto.
2046 * If registration was successful, proto will contain the negotiated
2047 * locking protocol.
2048 */
2049 struct dlm_ctxt * dlm_register_domain(const char *domain,
2050 u32 key,
2051 struct dlm_protocol_version *fs_proto)
2052 {
2053 int ret;
2054 struct dlm_ctxt *dlm = NULL;
2055 struct dlm_ctxt *new_ctxt = NULL;
2056
2057 if (strlen(domain) >= O2NM_MAX_NAME_LEN) {
2058 ret = -ENAMETOOLONG;
2059 mlog(ML_ERROR, "domain name length too long\n");
2060 goto leave;
2061 }
2062
2063 if (!o2hb_check_local_node_heartbeating()) {
2064 mlog(ML_ERROR, "the local node has not been configured, or is "
2065 "not heartbeating\n");
2066 ret = -EPROTO;
2067 goto leave;
2068 }
2069
2070 mlog(0, "register called for domain \"%s\"\n", domain);
2071
2072 retry:
2073 dlm = NULL;
2074 if (signal_pending(current)) {
2075 ret = -ERESTARTSYS;
2076 mlog_errno(ret);
2077 goto leave;
2078 }
2079
2080 spin_lock(&dlm_domain_lock);
2081
2082 dlm = __dlm_lookup_domain(domain);
2083 if (dlm) {
2084 if (dlm->dlm_state != DLM_CTXT_JOINED) {
2085 spin_unlock(&dlm_domain_lock);
2086
2087 mlog(0, "This ctxt is not joined yet!\n");
2088 wait_event_interruptible(dlm_domain_events,
2089 dlm_wait_on_domain_helper(
2090 domain));
2091 goto retry;
2092 }
2093
2094 if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
2095 spin_unlock(&dlm_domain_lock);
2096 mlog(ML_ERROR,
2097 "Requested locking protocol version is not "
2098 "compatible with already registered domain "
2099 "\"%s\"\n", domain);
2100 ret = -EPROTO;
2101 goto leave;
2102 }
2103
2104 __dlm_get(dlm);
2105 dlm->num_joins++;
2106
2107 spin_unlock(&dlm_domain_lock);
2108
2109 ret = 0;
2110 goto leave;
2111 }
2112
2113 /* doesn't exist */
2114 if (!new_ctxt) {
2115 spin_unlock(&dlm_domain_lock);
2116
2117 new_ctxt = dlm_alloc_ctxt(domain, key);
2118 if (new_ctxt)
2119 goto retry;
2120
2121 ret = -ENOMEM;
2122 mlog_errno(ret);
2123 goto leave;
2124 }
2125
2126 /* a little variable switch-a-roo here... */
2127 dlm = new_ctxt;
2128 new_ctxt = NULL;
2129
2130 /* add the new domain */
2131 list_add_tail(&dlm->list, &dlm_domains);
2132 spin_unlock(&dlm_domain_lock);
2133
2134 /*
2135 * Pass the locking protocol version into the join. If the join
2136 * succeeds, it will have the negotiated protocol set.
2137 */
2138 dlm->dlm_locking_proto = dlm_protocol;
2139 dlm->fs_locking_proto = *fs_proto;
2140
2141 ret = dlm_join_domain(dlm);
2142 if (ret) {
2143 mlog_errno(ret);
2144 dlm_put(dlm);
2145 goto leave;
2146 }
2147
2148 /* Tell the caller what locking protocol we negotiated */
2149 *fs_proto = dlm->fs_locking_proto;
2150
2151 ret = 0;
2152 leave:
2153 if (new_ctxt)
2154 dlm_free_ctxt_mem(new_ctxt);
2155
2156 if (ret < 0)
2157 dlm = ERR_PTR(ret);
2158
2159 return dlm;
2160 }
2161 EXPORT_SYMBOL_GPL(dlm_register_domain);
2162
2163 static LIST_HEAD(dlm_join_handlers);
2164
2165 static void dlm_unregister_net_handlers(void)
2166 {
2167 o2net_unregister_handler_list(&dlm_join_handlers);
2168 }
2169
2170 static int dlm_register_net_handlers(void)
2171 {
2172 int status = 0;
2173
2174 status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
2175 sizeof(struct dlm_query_join_request),
2176 dlm_query_join_handler,
2177 NULL, NULL, &dlm_join_handlers);
2178 if (status)
2179 goto bail;
2180
2181 status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
2182 sizeof(struct dlm_assert_joined),
2183 dlm_assert_joined_handler,
2184 NULL, NULL, &dlm_join_handlers);
2185 if (status)
2186 goto bail;
2187
2188 status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
2189 sizeof(struct dlm_cancel_join),
2190 dlm_cancel_join_handler,
2191 NULL, NULL, &dlm_join_handlers);
2192 if (status)
2193 goto bail;
2194
2195 status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY,
2196 sizeof(struct dlm_query_region),
2197 dlm_query_region_handler,
2198 NULL, NULL, &dlm_join_handlers);
2199
2200 if (status)
2201 goto bail;
2202
2203 status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
2204 sizeof(struct dlm_query_nodeinfo),
2205 dlm_query_nodeinfo_handler,
2206 NULL, NULL, &dlm_join_handlers);
2207 bail:
2208 if (status < 0)
2209 dlm_unregister_net_handlers();
2210
2211 return status;
2212 }
2213
2214 /* Domain eviction callback handling.
2215 *
2216 * The file system requires notification of node death *before* the
2217 * dlm completes it's recovery work, otherwise it may be able to
2218 * acquire locks on resources requiring recovery. Since the dlm can
2219 * evict a node from it's domain *before* heartbeat fires, a similar
2220 * mechanism is required. */
2221
2222 /* Eviction is not expected to happen often, so a per-domain lock is
2223 * not necessary. Eviction callbacks are allowed to sleep for short
2224 * periods of time. */
2225 static DECLARE_RWSEM(dlm_callback_sem);
2226
2227 void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
2228 int node_num)
2229 {
2230 struct list_head *iter;
2231 struct dlm_eviction_cb *cb;
2232
2233 down_read(&dlm_callback_sem);
2234 list_for_each(iter, &dlm->dlm_eviction_callbacks) {
2235 cb = list_entry(iter, struct dlm_eviction_cb, ec_item);
2236
2237 cb->ec_func(node_num, cb->ec_data);
2238 }
2239 up_read(&dlm_callback_sem);
2240 }
2241
2242 void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
2243 dlm_eviction_func *f,
2244 void *data)
2245 {
2246 INIT_LIST_HEAD(&cb->ec_item);
2247 cb->ec_func = f;
2248 cb->ec_data = data;
2249 }
2250 EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb);
2251
2252 void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
2253 struct dlm_eviction_cb *cb)
2254 {
2255 down_write(&dlm_callback_sem);
2256 list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks);
2257 up_write(&dlm_callback_sem);
2258 }
2259 EXPORT_SYMBOL_GPL(dlm_register_eviction_cb);
2260
2261 void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb)
2262 {
2263 down_write(&dlm_callback_sem);
2264 list_del_init(&cb->ec_item);
2265 up_write(&dlm_callback_sem);
2266 }
2267 EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb);
2268
2269 static int __init dlm_init(void)
2270 {
2271 int status;
2272
2273 dlm_print_version();
2274
2275 status = dlm_init_mle_cache();
2276 if (status) {
2277 mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n");
2278 goto error;
2279 }
2280
2281 status = dlm_init_master_caches();
2282 if (status) {
2283 mlog(ML_ERROR, "Could not create o2dlm_lockres and "
2284 "o2dlm_lockname slabcaches\n");
2285 goto error;
2286 }
2287
2288 status = dlm_init_lock_cache();
2289 if (status) {
2290 mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n");
2291 goto error;
2292 }
2293
2294 status = dlm_register_net_handlers();
2295 if (status) {
2296 mlog(ML_ERROR, "Unable to register network handlers\n");
2297 goto error;
2298 }
2299
2300 status = dlm_create_debugfs_root();
2301 if (status)
2302 goto error;
2303
2304 return 0;
2305 error:
2306 dlm_unregister_net_handlers();
2307 dlm_destroy_lock_cache();
2308 dlm_destroy_master_caches();
2309 dlm_destroy_mle_cache();
2310 return -1;
2311 }
2312
2313 static void __exit dlm_exit (void)
2314 {
2315 dlm_destroy_debugfs_root();
2316 dlm_unregister_net_handlers();
2317 dlm_destroy_lock_cache();
2318 dlm_destroy_master_caches();
2319 dlm_destroy_mle_cache();
2320 }
2321
2322 MODULE_AUTHOR("Oracle");
2323 MODULE_LICENSE("GPL");
2324
2325 module_init(dlm_init);
2326 module_exit(dlm_exit);
Linux with added FPC-III support