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WIP FPC-III support
[linux/fpc-iii.git] / fs / ocfs2 / dlm / dlmdomain.c
blob357cfc702ce369ae02048e652b8c949316a01b6b
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- mode: c; c-basic-offset: 8; -*-
3 * vim: noexpandtab sw=8 ts=8 sts=0:
4 *
5 * dlmdomain.c
6 *
7 * defines domain join / leave apis
8 *
9 * Copyright (C) 2004 Oracle. All rights reserved.
10 */
11
12 #include <linux/module.h>
13 #include <linux/types.h>
14 #include <linux/slab.h>
15 #include <linux/highmem.h>
16 #include <linux/init.h>
17 #include <linux/spinlock.h>
18 #include <linux/delay.h>
19 #include <linux/err.h>
20 #include <linux/debugfs.h>
21 #include <linux/sched/signal.h>
22
23 #include "../cluster/heartbeat.h"
24 #include "../cluster/nodemanager.h"
25 #include "../cluster/tcp.h"
26
27 #include "dlmapi.h"
28 #include "dlmcommon.h"
29 #include "dlmdomain.h"
30 #include "dlmdebug.h"
31
32 #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
33 #include "../cluster/masklog.h"
34
35 /*
36 * ocfs2 node maps are array of long int, which limits to send them freely
37 * across the wire due to endianness issues. To workaround this, we convert
38 * long ints to byte arrays. Following 3 routines are helper functions to
39 * set/test/copy bits within those array of bytes
40 */
41 static inline void byte_set_bit(u8 nr, u8 map[])
42 {
43 map[nr >> 3] |= (1UL << (nr & 7));
44 }
45
46 static inline int byte_test_bit(u8 nr, u8 map[])
47 {
48 return ((1UL << (nr & 7)) & (map[nr >> 3])) != 0;
49 }
50
51 static inline void byte_copymap(u8 dmap[], unsigned long smap[],
52 unsigned int sz)
53 {
54 unsigned int nn;
55
56 if (!sz)
57 return;
58
59 memset(dmap, 0, ((sz + 7) >> 3));
60 for (nn = 0 ; nn < sz; nn++)
61 if (test_bit(nn, smap))
62 byte_set_bit(nn, dmap);
63 }
64
65 static void dlm_free_pagevec(void **vec, int pages)
66 {
67 while (pages--)
68 free_page((unsigned long)vec[pages]);
69 kfree(vec);
70 }
71
72 static void **dlm_alloc_pagevec(int pages)
73 {
74 void **vec = kmalloc_array(pages, sizeof(void *), GFP_KERNEL);
75 int i;
76
77 if (!vec)
78 return NULL;
79
80 for (i = 0; i < pages; i++)
81 if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
82 goto out_free;
83
84 mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
85 pages, (unsigned long)DLM_HASH_PAGES,
86 (unsigned long)DLM_BUCKETS_PER_PAGE);
87 return vec;
88 out_free:
89 dlm_free_pagevec(vec, i);
90 return NULL;
91 }
92
93 /*
94 *
95 * spinlock lock ordering: if multiple locks are needed, obey this ordering:
96 * dlm_domain_lock
97 * struct dlm_ctxt->spinlock
98 * struct dlm_lock_resource->spinlock
99 * struct dlm_ctxt->master_lock
100 * struct dlm_ctxt->ast_lock
101 * dlm_master_list_entry->spinlock
102 * dlm_lock->spinlock
103 *
104 */
105
106 DEFINE_SPINLOCK(dlm_domain_lock);
107 LIST_HEAD(dlm_domains);
108 static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events);
109
110 /*
111 * The supported protocol version for DLM communication. Running domains
112 * will have a negotiated version with the same major number and a minor
113 * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
114 * be used to determine what a running domain is actually using.
115 *
116 * New in version 1.1:
117 * - Message DLM_QUERY_REGION added to support global heartbeat
118 * - Message DLM_QUERY_NODEINFO added to allow online node removes
119 * New in version 1.2:
120 * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain
121 * New in version 1.3:
122 * - Message DLM_DEREF_LOCKRES_DONE added to inform non-master that the
123 * refmap is cleared
124 */
125 static const struct dlm_protocol_version dlm_protocol = {
126 .pv_major = 1,
127 .pv_minor = 3,
128 };
129
130 #define DLM_DOMAIN_BACKOFF_MS 200
131
132 static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
133 void **ret_data);
134 static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
135 void **ret_data);
136 static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
137 void **ret_data);
138 static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
139 void *data, void **ret_data);
140 static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
141 void **ret_data);
142 static int dlm_protocol_compare(struct dlm_protocol_version *existing,
143 struct dlm_protocol_version *request);
144
145 static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm);
146
147 void __dlm_unhash_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
148 {
149 if (hlist_unhashed(&res->hash_node))
150 return;
151
152 mlog(0, "%s: Unhash res %.*s\n", dlm->name, res->lockname.len,
153 res->lockname.name);
154 hlist_del_init(&res->hash_node);
155 dlm_lockres_put(res);
156 }
157
158 void __dlm_insert_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res)
159 {
160 struct hlist_head *bucket;
161
162 assert_spin_locked(&dlm->spinlock);
163
164 bucket = dlm_lockres_hash(dlm, res->lockname.hash);
165
166 /* get a reference for our hashtable */
167 dlm_lockres_get(res);
168
169 hlist_add_head(&res->hash_node, bucket);
170
171 mlog(0, "%s: Hash res %.*s\n", dlm->name, res->lockname.len,
172 res->lockname.name);
173 }
174
175 struct dlm_lock_resource * __dlm_lookup_lockres_full(struct dlm_ctxt *dlm,
176 const char *name,
177 unsigned int len,
178 unsigned int hash)
179 {
180 struct hlist_head *bucket;
181 struct dlm_lock_resource *res;
182
183 mlog(0, "%.*s\n", len, name);
184
185 assert_spin_locked(&dlm->spinlock);
186
187 bucket = dlm_lockres_hash(dlm, hash);
188
189 hlist_for_each_entry(res, bucket, hash_node) {
190 if (res->lockname.name[0] != name[0])
191 continue;
192 if (unlikely(res->lockname.len != len))
193 continue;
194 if (memcmp(res->lockname.name + 1, name + 1, len - 1))
195 continue;
196 dlm_lockres_get(res);
197 return res;
198 }
199 return NULL;
200 }
201
202 /* intended to be called by functions which do not care about lock
203 * resources which are being purged (most net _handler functions).
204 * this will return NULL for any lock resource which is found but
205 * currently in the process of dropping its mastery reference.
206 * use __dlm_lookup_lockres_full when you need the lock resource
207 * regardless (e.g. dlm_get_lock_resource) */
208 struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
209 const char *name,
210 unsigned int len,
211 unsigned int hash)
212 {
213 struct dlm_lock_resource *res = NULL;
214
215 mlog(0, "%.*s\n", len, name);
216
217 assert_spin_locked(&dlm->spinlock);
218
219 res = __dlm_lookup_lockres_full(dlm, name, len, hash);
220 if (res) {
221 spin_lock(&res->spinlock);
222 if (res->state & DLM_LOCK_RES_DROPPING_REF) {
223 spin_unlock(&res->spinlock);
224 dlm_lockres_put(res);
225 return NULL;
226 }
227 spin_unlock(&res->spinlock);
228 }
229
230 return res;
231 }
232
233 struct dlm_lock_resource * dlm_lookup_lockres(struct dlm_ctxt *dlm,
234 const char *name,
235 unsigned int len)
236 {
237 struct dlm_lock_resource *res;
238 unsigned int hash = dlm_lockid_hash(name, len);
239
240 spin_lock(&dlm->spinlock);
241 res = __dlm_lookup_lockres(dlm, name, len, hash);
242 spin_unlock(&dlm->spinlock);
243 return res;
244 }
245
246 static struct dlm_ctxt * __dlm_lookup_domain_full(const char *domain, int len)
247 {
248 struct dlm_ctxt *tmp;
249
250 assert_spin_locked(&dlm_domain_lock);
251
252 /* tmp->name here is always NULL terminated,
253 * but domain may not be! */
254 list_for_each_entry(tmp, &dlm_domains, list) {
255 if (strlen(tmp->name) == len &&
256 memcmp(tmp->name, domain, len)==0)
257 return tmp;
258 }
259
260 return NULL;
261 }
262
263 /* For null terminated domain strings ONLY */
264 static struct dlm_ctxt * __dlm_lookup_domain(const char *domain)
265 {
266 assert_spin_locked(&dlm_domain_lock);
267
268 return __dlm_lookup_domain_full(domain, strlen(domain));
269 }
270
271
272 /* returns true on one of two conditions:
273 * 1) the domain does not exist
274 * 2) the domain exists and it's state is "joined" */
275 static int dlm_wait_on_domain_helper(const char *domain)
276 {
277 int ret = 0;
278 struct dlm_ctxt *tmp = NULL;
279
280 spin_lock(&dlm_domain_lock);
281
282 tmp = __dlm_lookup_domain(domain);
283 if (!tmp)
284 ret = 1;
285 else if (tmp->dlm_state == DLM_CTXT_JOINED)
286 ret = 1;
287
288 spin_unlock(&dlm_domain_lock);
289 return ret;
290 }
291
292 static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
293 {
294 dlm_destroy_debugfs_subroot(dlm);
295
296 if (dlm->lockres_hash)
297 dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
298
299 if (dlm->master_hash)
300 dlm_free_pagevec((void **)dlm->master_hash, DLM_HASH_PAGES);
301
302 kfree(dlm->name);
303 kfree(dlm);
304 }
305
306 /* A little strange - this function will be called while holding
307 * dlm_domain_lock and is expected to be holding it on the way out. We
308 * will however drop and reacquire it multiple times */
309 static void dlm_ctxt_release(struct kref *kref)
310 {
311 struct dlm_ctxt *dlm;
312
313 dlm = container_of(kref, struct dlm_ctxt, dlm_refs);
314
315 BUG_ON(dlm->num_joins);
316 BUG_ON(dlm->dlm_state == DLM_CTXT_JOINED);
317
318 /* we may still be in the list if we hit an error during join. */
319 list_del_init(&dlm->list);
320
321 spin_unlock(&dlm_domain_lock);
322
323 mlog(0, "freeing memory from domain %s\n", dlm->name);
324
325 wake_up(&dlm_domain_events);
326
327 dlm_free_ctxt_mem(dlm);
328
329 spin_lock(&dlm_domain_lock);
330 }
331
332 void dlm_put(struct dlm_ctxt *dlm)
333 {
334 spin_lock(&dlm_domain_lock);
335 kref_put(&dlm->dlm_refs, dlm_ctxt_release);
336 spin_unlock(&dlm_domain_lock);
337 }
338
339 static void __dlm_get(struct dlm_ctxt *dlm)
340 {
341 kref_get(&dlm->dlm_refs);
342 }
343
344 /* given a questionable reference to a dlm object, gets a reference if
345 * it can find it in the list, otherwise returns NULL in which case
346 * you shouldn't trust your pointer. */
347 struct dlm_ctxt *dlm_grab(struct dlm_ctxt *dlm)
348 {
349 struct dlm_ctxt *target;
350 struct dlm_ctxt *ret = NULL;
351
352 spin_lock(&dlm_domain_lock);
353
354 list_for_each_entry(target, &dlm_domains, list) {
355 if (target == dlm) {
356 __dlm_get(target);
357 ret = target;
358 break;
359 }
360 }
361
362 spin_unlock(&dlm_domain_lock);
363
364 return ret;
365 }
366
367 int dlm_domain_fully_joined(struct dlm_ctxt *dlm)
368 {
369 int ret;
370
371 spin_lock(&dlm_domain_lock);
372 ret = (dlm->dlm_state == DLM_CTXT_JOINED) ||
373 (dlm->dlm_state == DLM_CTXT_IN_SHUTDOWN);
374 spin_unlock(&dlm_domain_lock);
375
376 return ret;
377 }
378
379 static void dlm_destroy_dlm_worker(struct dlm_ctxt *dlm)
380 {
381 if (dlm->dlm_worker) {
382 destroy_workqueue(dlm->dlm_worker);
383 dlm->dlm_worker = NULL;
384 }
385 }
386
387 static void dlm_complete_dlm_shutdown(struct dlm_ctxt *dlm)
388 {
389 dlm_unregister_domain_handlers(dlm);
390 dlm_complete_thread(dlm);
391 dlm_complete_recovery_thread(dlm);
392 dlm_destroy_dlm_worker(dlm);
393
394 /* We've left the domain. Now we can take ourselves out of the
395 * list and allow the kref stuff to help us free the
396 * memory. */
397 spin_lock(&dlm_domain_lock);
398 list_del_init(&dlm->list);
399 spin_unlock(&dlm_domain_lock);
400
401 /* Wake up anyone waiting for us to remove this domain */
402 wake_up(&dlm_domain_events);
403 }
404
405 static int dlm_migrate_all_locks(struct dlm_ctxt *dlm)
406 {
407 int i, num, n, ret = 0;
408 struct dlm_lock_resource *res;
409 struct hlist_node *iter;
410 struct hlist_head *bucket;
411 int dropped;
412
413 mlog(0, "Migrating locks from domain %s\n", dlm->name);
414
415 num = 0;
416 spin_lock(&dlm->spinlock);
417 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
418 redo_bucket:
419 n = 0;
420 bucket = dlm_lockres_hash(dlm, i);
421 iter = bucket->first;
422 while (iter) {
423 n++;
424 res = hlist_entry(iter, struct dlm_lock_resource,
425 hash_node);
426 dlm_lockres_get(res);
427 /* migrate, if necessary. this will drop the dlm
428 * spinlock and retake it if it does migration. */
429 dropped = dlm_empty_lockres(dlm, res);
430
431 spin_lock(&res->spinlock);
432 if (dropped)
433 __dlm_lockres_calc_usage(dlm, res);
434 else
435 iter = res->hash_node.next;
436 spin_unlock(&res->spinlock);
437
438 dlm_lockres_put(res);
439
440 if (dropped) {
441 cond_resched_lock(&dlm->spinlock);
442 goto redo_bucket;
443 }
444 }
445 cond_resched_lock(&dlm->spinlock);
446 num += n;
447 }
448
449 if (!num) {
450 if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
451 mlog(0, "%s: perhaps there are more lock resources "
452 "need to be migrated after dlm recovery\n", dlm->name);
453 ret = -EAGAIN;
454 } else {
455 mlog(0, "%s: we won't do dlm recovery after migrating "
456 "all lock resources\n", dlm->name);
457 dlm->migrate_done = 1;
458 }
459 }
460
461 spin_unlock(&dlm->spinlock);
462 wake_up(&dlm->dlm_thread_wq);
463
464 /* let the dlm thread take care of purging, keep scanning until
465 * nothing remains in the hash */
466 if (num) {
467 mlog(0, "%s: %d lock resources in hash last pass\n",
468 dlm->name, num);
469 ret = -EAGAIN;
470 }
471 mlog(0, "DONE Migrating locks from domain %s\n", dlm->name);
472 return ret;
473 }
474
475 static int dlm_no_joining_node(struct dlm_ctxt *dlm)
476 {
477 int ret;
478
479 spin_lock(&dlm->spinlock);
480 ret = dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN;
481 spin_unlock(&dlm->spinlock);
482
483 return ret;
484 }
485
486 static int dlm_begin_exit_domain_handler(struct o2net_msg *msg, u32 len,
487 void *data, void **ret_data)
488 {
489 struct dlm_ctxt *dlm = data;
490 unsigned int node;
491 struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
492
493 if (!dlm_grab(dlm))
494 return 0;
495
496 node = exit_msg->node_idx;
497 mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm->name, node);
498
499 spin_lock(&dlm->spinlock);
500 set_bit(node, dlm->exit_domain_map);
501 spin_unlock(&dlm->spinlock);
502
503 dlm_put(dlm);
504
505 return 0;
506 }
507
508 static void dlm_mark_domain_leaving(struct dlm_ctxt *dlm)
509 {
510 /* Yikes, a double spinlock! I need domain_lock for the dlm
511 * state and the dlm spinlock for join state... Sorry! */
512 again:
513 spin_lock(&dlm_domain_lock);
514 spin_lock(&dlm->spinlock);
515
516 if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
517 mlog(0, "Node %d is joining, we wait on it.\n",
518 dlm->joining_node);
519 spin_unlock(&dlm->spinlock);
520 spin_unlock(&dlm_domain_lock);
521
522 wait_event(dlm->dlm_join_events, dlm_no_joining_node(dlm));
523 goto again;
524 }
525
526 dlm->dlm_state = DLM_CTXT_LEAVING;
527 spin_unlock(&dlm->spinlock);
528 spin_unlock(&dlm_domain_lock);
529 }
530
531 static void __dlm_print_nodes(struct dlm_ctxt *dlm)
532 {
533 int node = -1, num = 0;
534
535 assert_spin_locked(&dlm->spinlock);
536
537 printk("( ");
538 while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
539 node + 1)) < O2NM_MAX_NODES) {
540 printk("%d ", node);
541 ++num;
542 }
543 printk(") %u nodes\n", num);
544 }
545
546 static int dlm_exit_domain_handler(struct o2net_msg *msg, u32 len, void *data,
547 void **ret_data)
548 {
549 struct dlm_ctxt *dlm = data;
550 unsigned int node;
551 struct dlm_exit_domain *exit_msg = (struct dlm_exit_domain *) msg->buf;
552
553 mlog(0, "%p %u %p", msg, len, data);
554
555 if (!dlm_grab(dlm))
556 return 0;
557
558 node = exit_msg->node_idx;
559
560 spin_lock(&dlm->spinlock);
561 clear_bit(node, dlm->domain_map);
562 clear_bit(node, dlm->exit_domain_map);
563 printk(KERN_NOTICE "o2dlm: Node %u leaves domain %s ", node, dlm->name);
564 __dlm_print_nodes(dlm);
565
566 /* notify anything attached to the heartbeat events */
567 dlm_hb_event_notify_attached(dlm, node, 0);
568
569 spin_unlock(&dlm->spinlock);
570
571 dlm_put(dlm);
572
573 return 0;
574 }
575
576 static int dlm_send_one_domain_exit(struct dlm_ctxt *dlm, u32 msg_type,
577 unsigned int node)
578 {
579 int status;
580 struct dlm_exit_domain leave_msg;
581
582 mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm->name,
583 msg_type, node);
584
585 memset(&leave_msg, 0, sizeof(leave_msg));
586 leave_msg.node_idx = dlm->node_num;
587
588 status = o2net_send_message(msg_type, dlm->key, &leave_msg,
589 sizeof(leave_msg), node, NULL);
590 if (status < 0)
591 mlog(ML_ERROR, "Error %d sending domain exit message %u "
592 "to node %u on domain %s\n", status, msg_type, node,
593 dlm->name);
594
595 return status;
596 }
597
598 static void dlm_begin_exit_domain(struct dlm_ctxt *dlm)
599 {
600 int node = -1;
601
602 /* Support for begin exit domain was added in 1.2 */
603 if (dlm->dlm_locking_proto.pv_major == 1 &&
604 dlm->dlm_locking_proto.pv_minor < 2)
605 return;
606
607 /*
608 * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely
609 * informational. Meaning if a node does not receive the message,
610 * so be it.
611 */
612 spin_lock(&dlm->spinlock);
613 while (1) {
614 node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES, node + 1);
615 if (node >= O2NM_MAX_NODES)
616 break;
617 if (node == dlm->node_num)
618 continue;
619
620 spin_unlock(&dlm->spinlock);
621 dlm_send_one_domain_exit(dlm, DLM_BEGIN_EXIT_DOMAIN_MSG, node);
622 spin_lock(&dlm->spinlock);
623 }
624 spin_unlock(&dlm->spinlock);
625 }
626
627 static void dlm_leave_domain(struct dlm_ctxt *dlm)
628 {
629 int node, clear_node, status;
630
631 /* At this point we've migrated away all our locks and won't
632 * accept mastership of new ones. The dlm is responsible for
633 * almost nothing now. We make sure not to confuse any joining
634 * nodes and then commence shutdown procedure. */
635
636 spin_lock(&dlm->spinlock);
637 /* Clear ourselves from the domain map */
638 clear_bit(dlm->node_num, dlm->domain_map);
639 while ((node = find_next_bit(dlm->domain_map, O2NM_MAX_NODES,
640 0)) < O2NM_MAX_NODES) {
641 /* Drop the dlm spinlock. This is safe wrt the domain_map.
642 * -nodes cannot be added now as the
643 * query_join_handlers knows to respond with OK_NO_MAP
644 * -we catch the right network errors if a node is
645 * removed from the map while we're sending him the
646 * exit message. */
647 spin_unlock(&dlm->spinlock);
648
649 clear_node = 1;
650
651 status = dlm_send_one_domain_exit(dlm, DLM_EXIT_DOMAIN_MSG,
652 node);
653 if (status < 0 &&
654 status != -ENOPROTOOPT &&
655 status != -ENOTCONN) {
656 mlog(ML_NOTICE, "Error %d sending domain exit message "
657 "to node %d\n", status, node);
658
659 /* Not sure what to do here but lets sleep for
660 * a bit in case this was a transient
661 * error... */
662 msleep(DLM_DOMAIN_BACKOFF_MS);
663 clear_node = 0;
664 }
665
666 spin_lock(&dlm->spinlock);
667 /* If we're not clearing the node bit then we intend
668 * to loop back around to try again. */
669 if (clear_node)
670 clear_bit(node, dlm->domain_map);
671 }
672 spin_unlock(&dlm->spinlock);
673 }
674
675 void dlm_unregister_domain(struct dlm_ctxt *dlm)
676 {
677 int leave = 0;
678 struct dlm_lock_resource *res;
679
680 spin_lock(&dlm_domain_lock);
681 BUG_ON(dlm->dlm_state != DLM_CTXT_JOINED);
682 BUG_ON(!dlm->num_joins);
683
684 dlm->num_joins--;
685 if (!dlm->num_joins) {
686 /* We mark it "in shutdown" now so new register
687 * requests wait until we've completely left the
688 * domain. Don't use DLM_CTXT_LEAVING yet as we still
689 * want new domain joins to communicate with us at
690 * least until we've completed migration of our
691 * resources. */
692 dlm->dlm_state = DLM_CTXT_IN_SHUTDOWN;
693 leave = 1;
694 }
695 spin_unlock(&dlm_domain_lock);
696
697 if (leave) {
698 mlog(0, "shutting down domain %s\n", dlm->name);
699 dlm_begin_exit_domain(dlm);
700
701 /* We changed dlm state, notify the thread */
702 dlm_kick_thread(dlm, NULL);
703
704 while (dlm_migrate_all_locks(dlm)) {
705 /* Give dlm_thread time to purge the lockres' */
706 msleep(500);
707 mlog(0, "%s: more migration to do\n", dlm->name);
708 }
709
710 /* This list should be empty. If not, print remaining lockres */
711 if (!list_empty(&dlm->tracking_list)) {
712 mlog(ML_ERROR, "Following lockres' are still on the "
713 "tracking list:\n");
714 list_for_each_entry(res, &dlm->tracking_list, tracking)
715 dlm_print_one_lock_resource(res);
716 }
717
718 dlm_mark_domain_leaving(dlm);
719 dlm_leave_domain(dlm);
720 printk(KERN_NOTICE "o2dlm: Leaving domain %s\n", dlm->name);
721 dlm_force_free_mles(dlm);
722 dlm_complete_dlm_shutdown(dlm);
723 }
724 dlm_put(dlm);
725 }
726 EXPORT_SYMBOL_GPL(dlm_unregister_domain);
727
728 static int dlm_query_join_proto_check(char *proto_type, int node,
729 struct dlm_protocol_version *ours,
730 struct dlm_protocol_version *request)
731 {
732 int rc;
733 struct dlm_protocol_version proto = *request;
734
735 if (!dlm_protocol_compare(ours, &proto)) {
736 mlog(0,
737 "node %u wanted to join with %s locking protocol "
738 "%u.%u, we respond with %u.%u\n",
739 node, proto_type,
740 request->pv_major,
741 request->pv_minor,
742 proto.pv_major, proto.pv_minor);
743 request->pv_minor = proto.pv_minor;
744 rc = 0;
745 } else {
746 mlog(ML_NOTICE,
747 "Node %u wanted to join with %s locking "
748 "protocol %u.%u, but we have %u.%u, disallowing\n",
749 node, proto_type,
750 request->pv_major,
751 request->pv_minor,
752 ours->pv_major,
753 ours->pv_minor);
754 rc = 1;
755 }
756
757 return rc;
758 }
759
760 /*
761 * struct dlm_query_join_packet is made up of four one-byte fields. They
762 * are effectively in big-endian order already. However, little-endian
763 * machines swap them before putting the packet on the wire (because
764 * query_join's response is a status, and that status is treated as a u32
765 * on the wire). Thus, a big-endian and little-endian machines will treat
766 * this structure differently.
767 *
768 * The solution is to have little-endian machines swap the structure when
769 * converting from the structure to the u32 representation. This will
770 * result in the structure having the correct format on the wire no matter
771 * the host endian format.
772 */
773 static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet *packet,
774 u32 *wire)
775 {
776 union dlm_query_join_response response;
777
778 response.packet = *packet;
779 *wire = be32_to_cpu(response.intval);
780 }
781
782 static void dlm_query_join_wire_to_packet(u32 wire,
783 struct dlm_query_join_packet *packet)
784 {
785 union dlm_query_join_response response;
786
787 response.intval = cpu_to_be32(wire);
788 *packet = response.packet;
789 }
790
791 static int dlm_query_join_handler(struct o2net_msg *msg, u32 len, void *data,
792 void **ret_data)
793 {
794 struct dlm_query_join_request *query;
795 struct dlm_query_join_packet packet = {
796 .code = JOIN_DISALLOW,
797 };
798 struct dlm_ctxt *dlm = NULL;
799 u32 response;
800 u8 nodenum;
801
802 query = (struct dlm_query_join_request *) msg->buf;
803
804 mlog(0, "node %u wants to join domain %s\n", query->node_idx,
805 query->domain);
806
807 /*
808 * If heartbeat doesn't consider the node live, tell it
809 * to back off and try again. This gives heartbeat a chance
810 * to catch up.
811 */
812 if (!o2hb_check_node_heartbeating_no_sem(query->node_idx)) {
813 mlog(0, "node %u is not in our live map yet\n",
814 query->node_idx);
815
816 packet.code = JOIN_DISALLOW;
817 goto respond;
818 }
819
820 packet.code = JOIN_OK_NO_MAP;
821
822 spin_lock(&dlm_domain_lock);
823 dlm = __dlm_lookup_domain_full(query->domain, query->name_len);
824 if (!dlm)
825 goto unlock_respond;
826
827 /*
828 * There is a small window where the joining node may not see the
829 * node(s) that just left but still part of the cluster. DISALLOW
830 * join request if joining node has different node map.
831 */
832 nodenum=0;
833 while (nodenum < O2NM_MAX_NODES) {
834 if (test_bit(nodenum, dlm->domain_map)) {
835 if (!byte_test_bit(nodenum, query->node_map)) {
836 mlog(0, "disallow join as node %u does not "
837 "have node %u in its nodemap\n",
838 query->node_idx, nodenum);
839 packet.code = JOIN_DISALLOW;
840 goto unlock_respond;
841 }
842 }
843 nodenum++;
844 }
845
846 /* Once the dlm ctxt is marked as leaving then we don't want
847 * to be put in someone's domain map.
848 * Also, explicitly disallow joining at certain troublesome
849 * times (ie. during recovery). */
850 if (dlm->dlm_state != DLM_CTXT_LEAVING) {
851 int bit = query->node_idx;
852 spin_lock(&dlm->spinlock);
853
854 if (dlm->dlm_state == DLM_CTXT_NEW &&
855 dlm->joining_node == DLM_LOCK_RES_OWNER_UNKNOWN) {
856 /*If this is a brand new context and we
857 * haven't started our join process yet, then
858 * the other node won the race. */
859 packet.code = JOIN_OK_NO_MAP;
860 } else if (dlm->joining_node != DLM_LOCK_RES_OWNER_UNKNOWN) {
861 /* Disallow parallel joins. */
862 packet.code = JOIN_DISALLOW;
863 } else if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
864 mlog(0, "node %u trying to join, but recovery "
865 "is ongoing.\n", bit);
866 packet.code = JOIN_DISALLOW;
867 } else if (test_bit(bit, dlm->recovery_map)) {
868 mlog(0, "node %u trying to join, but it "
869 "still needs recovery.\n", bit);
870 packet.code = JOIN_DISALLOW;
871 } else if (test_bit(bit, dlm->domain_map)) {
872 mlog(0, "node %u trying to join, but it "
873 "is still in the domain! needs recovery?\n",
874 bit);
875 packet.code = JOIN_DISALLOW;
876 } else {
877 /* Alright we're fully a part of this domain
878 * so we keep some state as to who's joining
879 * and indicate to him that needs to be fixed
880 * up. */
881
882 /* Make sure we speak compatible locking protocols. */
883 if (dlm_query_join_proto_check("DLM", bit,
884 &dlm->dlm_locking_proto,
885 &query->dlm_proto)) {
886 packet.code = JOIN_PROTOCOL_MISMATCH;
887 } else if (dlm_query_join_proto_check("fs", bit,
888 &dlm->fs_locking_proto,
889 &query->fs_proto)) {
890 packet.code = JOIN_PROTOCOL_MISMATCH;
891 } else {
892 packet.dlm_minor = query->dlm_proto.pv_minor;
893 packet.fs_minor = query->fs_proto.pv_minor;
894 packet.code = JOIN_OK;
895 __dlm_set_joining_node(dlm, query->node_idx);
896 }
897 }
898
899 spin_unlock(&dlm->spinlock);
900 }
901 unlock_respond:
902 spin_unlock(&dlm_domain_lock);
903
904 respond:
905 mlog(0, "We respond with %u\n", packet.code);
906
907 dlm_query_join_packet_to_wire(&packet, &response);
908 return response;
909 }
910
911 static int dlm_assert_joined_handler(struct o2net_msg *msg, u32 len, void *data,
912 void **ret_data)
913 {
914 struct dlm_assert_joined *assert;
915 struct dlm_ctxt *dlm = NULL;
916
917 assert = (struct dlm_assert_joined *) msg->buf;
918
919 mlog(0, "node %u asserts join on domain %s\n", assert->node_idx,
920 assert->domain);
921
922 spin_lock(&dlm_domain_lock);
923 dlm = __dlm_lookup_domain_full(assert->domain, assert->name_len);
924 /* XXX should we consider no dlm ctxt an error? */
925 if (dlm) {
926 spin_lock(&dlm->spinlock);
927
928 /* Alright, this node has officially joined our
929 * domain. Set him in the map and clean up our
930 * leftover join state. */
931 BUG_ON(dlm->joining_node != assert->node_idx);
932
933 if (dlm->reco.state & DLM_RECO_STATE_ACTIVE) {
934 mlog(0, "dlm recovery is ongoing, disallow join\n");
935 spin_unlock(&dlm->spinlock);
936 spin_unlock(&dlm_domain_lock);
937 return -EAGAIN;
938 }
939
940 set_bit(assert->node_idx, dlm->domain_map);
941 clear_bit(assert->node_idx, dlm->exit_domain_map);
942 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
943
944 printk(KERN_NOTICE "o2dlm: Node %u joins domain %s ",
945 assert->node_idx, dlm->name);
946 __dlm_print_nodes(dlm);
947
948 /* notify anything attached to the heartbeat events */
949 dlm_hb_event_notify_attached(dlm, assert->node_idx, 1);
950
951 spin_unlock(&dlm->spinlock);
952 }
953 spin_unlock(&dlm_domain_lock);
954
955 return 0;
956 }
957
958 static int dlm_match_regions(struct dlm_ctxt *dlm,
959 struct dlm_query_region *qr,
960 char *local, int locallen)
961 {
962 char *remote = qr->qr_regions;
963 char *l, *r;
964 int localnr, i, j, foundit;
965 int status = 0;
966
967 if (!o2hb_global_heartbeat_active()) {
968 if (qr->qr_numregions) {
969 mlog(ML_ERROR, "Domain %s: Joining node %d has global "
970 "heartbeat enabled but local node %d does not\n",
971 qr->qr_domain, qr->qr_node, dlm->node_num);
972 status = -EINVAL;
973 }
974 goto bail;
975 }
976
977 if (o2hb_global_heartbeat_active() && !qr->qr_numregions) {
978 mlog(ML_ERROR, "Domain %s: Local node %d has global "
979 "heartbeat enabled but joining node %d does not\n",
980 qr->qr_domain, dlm->node_num, qr->qr_node);
981 status = -EINVAL;
982 goto bail;
983 }
984
985 r = remote;
986 for (i = 0; i < qr->qr_numregions; ++i) {
987 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, r);
988 r += O2HB_MAX_REGION_NAME_LEN;
989 }
990
991 localnr = min(O2NM_MAX_REGIONS, locallen/O2HB_MAX_REGION_NAME_LEN);
992 localnr = o2hb_get_all_regions(local, (u8)localnr);
993
994 /* compare local regions with remote */
995 l = local;
996 for (i = 0; i < localnr; ++i) {
997 foundit = 0;
998 r = remote;
999 for (j = 0; j <= qr->qr_numregions; ++j) {
1000 if (!memcmp(l, r, O2HB_MAX_REGION_NAME_LEN)) {
1001 foundit = 1;
1002 break;
1003 }
1004 r += O2HB_MAX_REGION_NAME_LEN;
1005 }
1006 if (!foundit) {
1007 status = -EINVAL;
1008 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1009 "in local node %d but not in joining node %d\n",
1010 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, l,
1011 dlm->node_num, qr->qr_node);
1012 goto bail;
1013 }
1014 l += O2HB_MAX_REGION_NAME_LEN;
1015 }
1016
1017 /* compare remote with local regions */
1018 r = remote;
1019 for (i = 0; i < qr->qr_numregions; ++i) {
1020 foundit = 0;
1021 l = local;
1022 for (j = 0; j < localnr; ++j) {
1023 if (!memcmp(r, l, O2HB_MAX_REGION_NAME_LEN)) {
1024 foundit = 1;
1025 break;
1026 }
1027 l += O2HB_MAX_REGION_NAME_LEN;
1028 }
1029 if (!foundit) {
1030 status = -EINVAL;
1031 mlog(ML_ERROR, "Domain %s: Region '%.*s' registered "
1032 "in joining node %d but not in local node %d\n",
1033 qr->qr_domain, O2HB_MAX_REGION_NAME_LEN, r,
1034 qr->qr_node, dlm->node_num);
1035 goto bail;
1036 }
1037 r += O2HB_MAX_REGION_NAME_LEN;
1038 }
1039
1040 bail:
1041 return status;
1042 }
1043
1044 static int dlm_send_regions(struct dlm_ctxt *dlm, unsigned long *node_map)
1045 {
1046 struct dlm_query_region *qr = NULL;
1047 int status, ret = 0, i;
1048 char *p;
1049
1050 if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
1051 goto bail;
1052
1053 qr = kzalloc(sizeof(struct dlm_query_region), GFP_KERNEL);
1054 if (!qr) {
1055 ret = -ENOMEM;
1056 mlog_errno(ret);
1057 goto bail;
1058 }
1059
1060 qr->qr_node = dlm->node_num;
1061 qr->qr_namelen = strlen(dlm->name);
1062 memcpy(qr->qr_domain, dlm->name, qr->qr_namelen);
1063 /* if local hb, the numregions will be zero */
1064 if (o2hb_global_heartbeat_active())
1065 qr->qr_numregions = o2hb_get_all_regions(qr->qr_regions,
1066 O2NM_MAX_REGIONS);
1067
1068 p = qr->qr_regions;
1069 for (i = 0; i < qr->qr_numregions; ++i, p += O2HB_MAX_REGION_NAME_LEN)
1070 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN, p);
1071
1072 i = -1;
1073 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1074 i + 1)) < O2NM_MAX_NODES) {
1075 if (i == dlm->node_num)
1076 continue;
1077
1078 mlog(0, "Sending regions to node %d\n", i);
1079
1080 ret = o2net_send_message(DLM_QUERY_REGION, DLM_MOD_KEY, qr,
1081 sizeof(struct dlm_query_region),
1082 i, &status);
1083 if (ret >= 0)
1084 ret = status;
1085 if (ret) {
1086 mlog(ML_ERROR, "Region mismatch %d, node %d\n",
1087 ret, i);
1088 break;
1089 }
1090 }
1091
1092 bail:
1093 kfree(qr);
1094 return ret;
1095 }
1096
1097 static int dlm_query_region_handler(struct o2net_msg *msg, u32 len,
1098 void *data, void **ret_data)
1099 {
1100 struct dlm_query_region *qr;
1101 struct dlm_ctxt *dlm = NULL;
1102 char *local = NULL;
1103 int status = 0;
1104
1105 qr = (struct dlm_query_region *) msg->buf;
1106
1107 mlog(0, "Node %u queries hb regions on domain %s\n", qr->qr_node,
1108 qr->qr_domain);
1109
1110 /* buffer used in dlm_mast_regions() */
1111 local = kmalloc(sizeof(qr->qr_regions), GFP_KERNEL);
1112 if (!local)
1113 return -ENOMEM;
1114
1115 status = -EINVAL;
1116
1117 spin_lock(&dlm_domain_lock);
1118 dlm = __dlm_lookup_domain_full(qr->qr_domain, qr->qr_namelen);
1119 if (!dlm) {
1120 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1121 "before join domain\n", qr->qr_node, qr->qr_domain);
1122 goto out_domain_lock;
1123 }
1124
1125 spin_lock(&dlm->spinlock);
1126 if (dlm->joining_node != qr->qr_node) {
1127 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1128 "but joining node is %d\n", qr->qr_node, qr->qr_domain,
1129 dlm->joining_node);
1130 goto out_dlm_lock;
1131 }
1132
1133 /* Support for global heartbeat was added in 1.1 */
1134 if (dlm->dlm_locking_proto.pv_major == 1 &&
1135 dlm->dlm_locking_proto.pv_minor == 0) {
1136 mlog(ML_ERROR, "Node %d queried hb regions on domain %s "
1137 "but active dlm protocol is %d.%d\n", qr->qr_node,
1138 qr->qr_domain, dlm->dlm_locking_proto.pv_major,
1139 dlm->dlm_locking_proto.pv_minor);
1140 goto out_dlm_lock;
1141 }
1142
1143 status = dlm_match_regions(dlm, qr, local, sizeof(qr->qr_regions));
1144
1145 out_dlm_lock:
1146 spin_unlock(&dlm->spinlock);
1147
1148 out_domain_lock:
1149 spin_unlock(&dlm_domain_lock);
1150
1151 kfree(local);
1152
1153 return status;
1154 }
1155
1156 static int dlm_match_nodes(struct dlm_ctxt *dlm, struct dlm_query_nodeinfo *qn)
1157 {
1158 struct o2nm_node *local;
1159 struct dlm_node_info *remote;
1160 int i, j;
1161 int status = 0;
1162
1163 for (j = 0; j < qn->qn_numnodes; ++j)
1164 mlog(0, "Node %3d, %pI4:%u\n", qn->qn_nodes[j].ni_nodenum,
1165 &(qn->qn_nodes[j].ni_ipv4_address),
1166 ntohs(qn->qn_nodes[j].ni_ipv4_port));
1167
1168 for (i = 0; i < O2NM_MAX_NODES && !status; ++i) {
1169 local = o2nm_get_node_by_num(i);
1170 remote = NULL;
1171 for (j = 0; j < qn->qn_numnodes; ++j) {
1172 if (qn->qn_nodes[j].ni_nodenum == i) {
1173 remote = &(qn->qn_nodes[j]);
1174 break;
1175 }
1176 }
1177
1178 if (!local && !remote)
1179 continue;
1180
1181 if ((local && !remote) || (!local && remote))
1182 status = -EINVAL;
1183
1184 if (!status &&
1185 ((remote->ni_nodenum != local->nd_num) ||
1186 (remote->ni_ipv4_port != local->nd_ipv4_port) ||
1187 (remote->ni_ipv4_address != local->nd_ipv4_address)))
1188 status = -EINVAL;
1189
1190 if (status) {
1191 if (remote && !local)
1192 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1193 "registered in joining node %d but not in "
1194 "local node %d\n", qn->qn_domain,
1195 remote->ni_nodenum,
1196 &(remote->ni_ipv4_address),
1197 ntohs(remote->ni_ipv4_port),
1198 qn->qn_nodenum, dlm->node_num);
1199 if (local && !remote)
1200 mlog(ML_ERROR, "Domain %s: Node %d (%pI4:%u) "
1201 "registered in local node %d but not in "
1202 "joining node %d\n", qn->qn_domain,
1203 local->nd_num, &(local->nd_ipv4_address),
1204 ntohs(local->nd_ipv4_port),
1205 dlm->node_num, qn->qn_nodenum);
1206 BUG_ON((!local && !remote));
1207 }
1208
1209 if (local)
1210 o2nm_node_put(local);
1211 }
1212
1213 return status;
1214 }
1215
1216 static int dlm_send_nodeinfo(struct dlm_ctxt *dlm, unsigned long *node_map)
1217 {
1218 struct dlm_query_nodeinfo *qn = NULL;
1219 struct o2nm_node *node;
1220 int ret = 0, status, count, i;
1221
1222 if (find_next_bit(node_map, O2NM_MAX_NODES, 0) >= O2NM_MAX_NODES)
1223 goto bail;
1224
1225 qn = kzalloc(sizeof(struct dlm_query_nodeinfo), GFP_KERNEL);
1226 if (!qn) {
1227 ret = -ENOMEM;
1228 mlog_errno(ret);
1229 goto bail;
1230 }
1231
1232 for (i = 0, count = 0; i < O2NM_MAX_NODES; ++i) {
1233 node = o2nm_get_node_by_num(i);
1234 if (!node)
1235 continue;
1236 qn->qn_nodes[count].ni_nodenum = node->nd_num;
1237 qn->qn_nodes[count].ni_ipv4_port = node->nd_ipv4_port;
1238 qn->qn_nodes[count].ni_ipv4_address = node->nd_ipv4_address;
1239 mlog(0, "Node %3d, %pI4:%u\n", node->nd_num,
1240 &(node->nd_ipv4_address), ntohs(node->nd_ipv4_port));
1241 ++count;
1242 o2nm_node_put(node);
1243 }
1244
1245 qn->qn_nodenum = dlm->node_num;
1246 qn->qn_numnodes = count;
1247 qn->qn_namelen = strlen(dlm->name);
1248 memcpy(qn->qn_domain, dlm->name, qn->qn_namelen);
1249
1250 i = -1;
1251 while ((i = find_next_bit(node_map, O2NM_MAX_NODES,
1252 i + 1)) < O2NM_MAX_NODES) {
1253 if (i == dlm->node_num)
1254 continue;
1255
1256 mlog(0, "Sending nodeinfo to node %d\n", i);
1257
1258 ret = o2net_send_message(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
1259 qn, sizeof(struct dlm_query_nodeinfo),
1260 i, &status);
1261 if (ret >= 0)
1262 ret = status;
1263 if (ret) {
1264 mlog(ML_ERROR, "node mismatch %d, node %d\n", ret, i);
1265 break;
1266 }
1267 }
1268
1269 bail:
1270 kfree(qn);
1271 return ret;
1272 }
1273
1274 static int dlm_query_nodeinfo_handler(struct o2net_msg *msg, u32 len,
1275 void *data, void **ret_data)
1276 {
1277 struct dlm_query_nodeinfo *qn;
1278 struct dlm_ctxt *dlm = NULL;
1279 int locked = 0, status = -EINVAL;
1280
1281 qn = (struct dlm_query_nodeinfo *) msg->buf;
1282
1283 mlog(0, "Node %u queries nodes on domain %s\n", qn->qn_nodenum,
1284 qn->qn_domain);
1285
1286 spin_lock(&dlm_domain_lock);
1287 dlm = __dlm_lookup_domain_full(qn->qn_domain, qn->qn_namelen);
1288 if (!dlm) {
1289 mlog(ML_ERROR, "Node %d queried nodes on domain %s before "
1290 "join domain\n", qn->qn_nodenum, qn->qn_domain);
1291 goto bail;
1292 }
1293
1294 spin_lock(&dlm->spinlock);
1295 locked = 1;
1296 if (dlm->joining_node != qn->qn_nodenum) {
1297 mlog(ML_ERROR, "Node %d queried nodes on domain %s but "
1298 "joining node is %d\n", qn->qn_nodenum, qn->qn_domain,
1299 dlm->joining_node);
1300 goto bail;
1301 }
1302
1303 /* Support for node query was added in 1.1 */
1304 if (dlm->dlm_locking_proto.pv_major == 1 &&
1305 dlm->dlm_locking_proto.pv_minor == 0) {
1306 mlog(ML_ERROR, "Node %d queried nodes on domain %s "
1307 "but active dlm protocol is %d.%d\n", qn->qn_nodenum,
1308 qn->qn_domain, dlm->dlm_locking_proto.pv_major,
1309 dlm->dlm_locking_proto.pv_minor);
1310 goto bail;
1311 }
1312
1313 status = dlm_match_nodes(dlm, qn);
1314
1315 bail:
1316 if (locked)
1317 spin_unlock(&dlm->spinlock);
1318 spin_unlock(&dlm_domain_lock);
1319
1320 return status;
1321 }
1322
1323 static int dlm_cancel_join_handler(struct o2net_msg *msg, u32 len, void *data,
1324 void **ret_data)
1325 {
1326 struct dlm_cancel_join *cancel;
1327 struct dlm_ctxt *dlm = NULL;
1328
1329 cancel = (struct dlm_cancel_join *) msg->buf;
1330
1331 mlog(0, "node %u cancels join on domain %s\n", cancel->node_idx,
1332 cancel->domain);
1333
1334 spin_lock(&dlm_domain_lock);
1335 dlm = __dlm_lookup_domain_full(cancel->domain, cancel->name_len);
1336
1337 if (dlm) {
1338 spin_lock(&dlm->spinlock);
1339
1340 /* Yikes, this guy wants to cancel his join. No
1341 * problem, we simply cleanup our join state. */
1342 BUG_ON(dlm->joining_node != cancel->node_idx);
1343 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1344
1345 spin_unlock(&dlm->spinlock);
1346 }
1347 spin_unlock(&dlm_domain_lock);
1348
1349 return 0;
1350 }
1351
1352 static int dlm_send_one_join_cancel(struct dlm_ctxt *dlm,
1353 unsigned int node)
1354 {
1355 int status;
1356 struct dlm_cancel_join cancel_msg;
1357
1358 memset(&cancel_msg, 0, sizeof(cancel_msg));
1359 cancel_msg.node_idx = dlm->node_num;
1360 cancel_msg.name_len = strlen(dlm->name);
1361 memcpy(cancel_msg.domain, dlm->name, cancel_msg.name_len);
1362
1363 status = o2net_send_message(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1364 &cancel_msg, sizeof(cancel_msg), node,
1365 NULL);
1366 if (status < 0) {
1367 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1368 "node %u\n", status, DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
1369 node);
1370 goto bail;
1371 }
1372
1373 bail:
1374 return status;
1375 }
1376
1377 /* map_size should be in bytes. */
1378 static int dlm_send_join_cancels(struct dlm_ctxt *dlm,
1379 unsigned long *node_map,
1380 unsigned int map_size)
1381 {
1382 int status, tmpstat;
1383 int node;
1384
1385 if (map_size != (BITS_TO_LONGS(O2NM_MAX_NODES) *
1386 sizeof(unsigned long))) {
1387 mlog(ML_ERROR,
1388 "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
1389 map_size, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES));
1390 return -EINVAL;
1391 }
1392
1393 status = 0;
1394 node = -1;
1395 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1396 node + 1)) < O2NM_MAX_NODES) {
1397 if (node == dlm->node_num)
1398 continue;
1399
1400 tmpstat = dlm_send_one_join_cancel(dlm, node);
1401 if (tmpstat) {
1402 mlog(ML_ERROR, "Error return %d cancelling join on "
1403 "node %d\n", tmpstat, node);
1404 if (!status)
1405 status = tmpstat;
1406 }
1407 }
1408
1409 if (status)
1410 mlog_errno(status);
1411 return status;
1412 }
1413
1414 static int dlm_request_join(struct dlm_ctxt *dlm,
1415 int node,
1416 enum dlm_query_join_response_code *response)
1417 {
1418 int status;
1419 struct dlm_query_join_request join_msg;
1420 struct dlm_query_join_packet packet;
1421 u32 join_resp;
1422
1423 mlog(0, "querying node %d\n", node);
1424
1425 memset(&join_msg, 0, sizeof(join_msg));
1426 join_msg.node_idx = dlm->node_num;
1427 join_msg.name_len = strlen(dlm->name);
1428 memcpy(join_msg.domain, dlm->name, join_msg.name_len);
1429 join_msg.dlm_proto = dlm->dlm_locking_proto;
1430 join_msg.fs_proto = dlm->fs_locking_proto;
1431
1432 /* copy live node map to join message */
1433 byte_copymap(join_msg.node_map, dlm->live_nodes_map, O2NM_MAX_NODES);
1434
1435 status = o2net_send_message(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY, &join_msg,
1436 sizeof(join_msg), node, &join_resp);
1437 if (status < 0 && status != -ENOPROTOOPT) {
1438 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1439 "node %u\n", status, DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
1440 node);
1441 goto bail;
1442 }
1443 dlm_query_join_wire_to_packet(join_resp, &packet);
1444
1445 /* -ENOPROTOOPT from the net code means the other side isn't
1446 listening for our message type -- that's fine, it means
1447 his dlm isn't up, so we can consider him a 'yes' but not
1448 joined into the domain. */
1449 if (status == -ENOPROTOOPT) {
1450 status = 0;
1451 *response = JOIN_OK_NO_MAP;
1452 } else {
1453 *response = packet.code;
1454 switch (packet.code) {
1455 case JOIN_DISALLOW:
1456 case JOIN_OK_NO_MAP:
1457 break;
1458 case JOIN_PROTOCOL_MISMATCH:
1459 mlog(ML_NOTICE,
1460 "This node requested DLM locking protocol %u.%u and "
1461 "filesystem locking protocol %u.%u. At least one of "
1462 "the protocol versions on node %d is not compatible, "
1463 "disconnecting\n",
1464 dlm->dlm_locking_proto.pv_major,
1465 dlm->dlm_locking_proto.pv_minor,
1466 dlm->fs_locking_proto.pv_major,
1467 dlm->fs_locking_proto.pv_minor,
1468 node);
1469 status = -EPROTO;
1470 break;
1471 case JOIN_OK:
1472 /* Use the same locking protocol as the remote node */
1473 dlm->dlm_locking_proto.pv_minor = packet.dlm_minor;
1474 dlm->fs_locking_proto.pv_minor = packet.fs_minor;
1475 mlog(0,
1476 "Node %d responds JOIN_OK with DLM locking protocol "
1477 "%u.%u and fs locking protocol %u.%u\n",
1478 node,
1479 dlm->dlm_locking_proto.pv_major,
1480 dlm->dlm_locking_proto.pv_minor,
1481 dlm->fs_locking_proto.pv_major,
1482 dlm->fs_locking_proto.pv_minor);
1483 break;
1484 default:
1485 status = -EINVAL;
1486 mlog(ML_ERROR, "invalid response %d from node %u\n",
1487 packet.code, node);
1488 /* Reset response to JOIN_DISALLOW */
1489 *response = JOIN_DISALLOW;
1490 break;
1491 }
1492 }
1493
1494 mlog(0, "status %d, node %d response is %d\n", status, node,
1495 *response);
1496
1497 bail:
1498 return status;
1499 }
1500
1501 static int dlm_send_one_join_assert(struct dlm_ctxt *dlm,
1502 unsigned int node)
1503 {
1504 int status;
1505 int ret;
1506 struct dlm_assert_joined assert_msg;
1507
1508 mlog(0, "Sending join assert to node %u\n", node);
1509
1510 memset(&assert_msg, 0, sizeof(assert_msg));
1511 assert_msg.node_idx = dlm->node_num;
1512 assert_msg.name_len = strlen(dlm->name);
1513 memcpy(assert_msg.domain, dlm->name, assert_msg.name_len);
1514
1515 status = o2net_send_message(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1516 &assert_msg, sizeof(assert_msg), node,
1517 &ret);
1518 if (status < 0)
1519 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
1520 "node %u\n", status, DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
1521 node);
1522 else
1523 status = ret;
1524
1525 return status;
1526 }
1527
1528 static void dlm_send_join_asserts(struct dlm_ctxt *dlm,
1529 unsigned long *node_map)
1530 {
1531 int status, node, live;
1532
1533 status = 0;
1534 node = -1;
1535 while ((node = find_next_bit(node_map, O2NM_MAX_NODES,
1536 node + 1)) < O2NM_MAX_NODES) {
1537 if (node == dlm->node_num)
1538 continue;
1539
1540 do {
1541 /* It is very important that this message be
1542 * received so we spin until either the node
1543 * has died or it gets the message. */
1544 status = dlm_send_one_join_assert(dlm, node);
1545
1546 spin_lock(&dlm->spinlock);
1547 live = test_bit(node, dlm->live_nodes_map);
1548 spin_unlock(&dlm->spinlock);
1549
1550 if (status) {
1551 mlog(ML_ERROR, "Error return %d asserting "
1552 "join on node %d\n", status, node);
1553
1554 /* give us some time between errors... */
1555 if (live)
1556 msleep(DLM_DOMAIN_BACKOFF_MS);
1557 }
1558 } while (status && live);
1559 }
1560 }
1561
1562 struct domain_join_ctxt {
1563 unsigned long live_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1564 unsigned long yes_resp_map[BITS_TO_LONGS(O2NM_MAX_NODES)];
1565 };
1566
1567 static int dlm_should_restart_join(struct dlm_ctxt *dlm,
1568 struct domain_join_ctxt *ctxt,
1569 enum dlm_query_join_response_code response)
1570 {
1571 int ret;
1572
1573 if (response == JOIN_DISALLOW) {
1574 mlog(0, "Latest response of disallow -- should restart\n");
1575 return 1;
1576 }
1577
1578 spin_lock(&dlm->spinlock);
1579 /* For now, we restart the process if the node maps have
1580 * changed at all */
1581 ret = memcmp(ctxt->live_map, dlm->live_nodes_map,
1582 sizeof(dlm->live_nodes_map));
1583 spin_unlock(&dlm->spinlock);
1584
1585 if (ret)
1586 mlog(0, "Node maps changed -- should restart\n");
1587
1588 return ret;
1589 }
1590
1591 static int dlm_try_to_join_domain(struct dlm_ctxt *dlm)
1592 {
1593 int status = 0, tmpstat, node;
1594 struct domain_join_ctxt *ctxt;
1595 enum dlm_query_join_response_code response = JOIN_DISALLOW;
1596
1597 mlog(0, "%p", dlm);
1598
1599 ctxt = kzalloc(sizeof(*ctxt), GFP_KERNEL);
1600 if (!ctxt) {
1601 status = -ENOMEM;
1602 mlog_errno(status);
1603 goto bail;
1604 }
1605
1606 /* group sem locking should work for us here -- we're already
1607 * registered for heartbeat events so filling this should be
1608 * atomic wrt getting those handlers called. */
1609 o2hb_fill_node_map(dlm->live_nodes_map, sizeof(dlm->live_nodes_map));
1610
1611 spin_lock(&dlm->spinlock);
1612 memcpy(ctxt->live_map, dlm->live_nodes_map, sizeof(ctxt->live_map));
1613
1614 __dlm_set_joining_node(dlm, dlm->node_num);
1615
1616 spin_unlock(&dlm->spinlock);
1617
1618 node = -1;
1619 while ((node = find_next_bit(ctxt->live_map, O2NM_MAX_NODES,
1620 node + 1)) < O2NM_MAX_NODES) {
1621 if (node == dlm->node_num)
1622 continue;
1623
1624 status = dlm_request_join(dlm, node, &response);
1625 if (status < 0) {
1626 mlog_errno(status);
1627 goto bail;
1628 }
1629
1630 /* Ok, either we got a response or the node doesn't have a
1631 * dlm up. */
1632 if (response == JOIN_OK)
1633 set_bit(node, ctxt->yes_resp_map);
1634
1635 if (dlm_should_restart_join(dlm, ctxt, response)) {
1636 status = -EAGAIN;
1637 goto bail;
1638 }
1639 }
1640
1641 mlog(0, "Yay, done querying nodes!\n");
1642
1643 /* Yay, everyone agree's we can join the domain. My domain is
1644 * comprised of all nodes who were put in the
1645 * yes_resp_map. Copy that into our domain map and send a join
1646 * assert message to clean up everyone elses state. */
1647 spin_lock(&dlm->spinlock);
1648 memcpy(dlm->domain_map, ctxt->yes_resp_map,
1649 sizeof(ctxt->yes_resp_map));
1650 set_bit(dlm->node_num, dlm->domain_map);
1651 spin_unlock(&dlm->spinlock);
1652
1653 /* Support for global heartbeat and node info was added in 1.1 */
1654 if (dlm->dlm_locking_proto.pv_major > 1 ||
1655 dlm->dlm_locking_proto.pv_minor > 0) {
1656 status = dlm_send_nodeinfo(dlm, ctxt->yes_resp_map);
1657 if (status) {
1658 mlog_errno(status);
1659 goto bail;
1660 }
1661 status = dlm_send_regions(dlm, ctxt->yes_resp_map);
1662 if (status) {
1663 mlog_errno(status);
1664 goto bail;
1665 }
1666 }
1667
1668 dlm_send_join_asserts(dlm, ctxt->yes_resp_map);
1669
1670 /* Joined state *must* be set before the joining node
1671 * information, otherwise the query_join handler may read no
1672 * current joiner but a state of NEW and tell joining nodes
1673 * we're not in the domain. */
1674 spin_lock(&dlm_domain_lock);
1675 dlm->dlm_state = DLM_CTXT_JOINED;
1676 dlm->num_joins++;
1677 spin_unlock(&dlm_domain_lock);
1678
1679 bail:
1680 spin_lock(&dlm->spinlock);
1681 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1682 if (!status) {
1683 printk(KERN_NOTICE "o2dlm: Joining domain %s ", dlm->name);
1684 __dlm_print_nodes(dlm);
1685 }
1686 spin_unlock(&dlm->spinlock);
1687
1688 if (ctxt) {
1689 /* Do we need to send a cancel message to any nodes? */
1690 if (status < 0) {
1691 tmpstat = dlm_send_join_cancels(dlm,
1692 ctxt->yes_resp_map,
1693 sizeof(ctxt->yes_resp_map));
1694 if (tmpstat < 0)
1695 mlog_errno(tmpstat);
1696 }
1697 kfree(ctxt);
1698 }
1699
1700 mlog(0, "returning %d\n", status);
1701 return status;
1702 }
1703
1704 static void dlm_unregister_domain_handlers(struct dlm_ctxt *dlm)
1705 {
1706 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_up);
1707 o2hb_unregister_callback(dlm->name, &dlm->dlm_hb_down);
1708 o2net_unregister_handler_list(&dlm->dlm_domain_handlers);
1709 }
1710
1711 static int dlm_register_domain_handlers(struct dlm_ctxt *dlm)
1712 {
1713 int status;
1714
1715 mlog(0, "registering handlers.\n");
1716
1717 o2hb_setup_callback(&dlm->dlm_hb_down, O2HB_NODE_DOWN_CB,
1718 dlm_hb_node_down_cb, dlm, DLM_HB_NODE_DOWN_PRI);
1719 o2hb_setup_callback(&dlm->dlm_hb_up, O2HB_NODE_UP_CB,
1720 dlm_hb_node_up_cb, dlm, DLM_HB_NODE_UP_PRI);
1721
1722 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_down);
1723 if (status)
1724 goto bail;
1725
1726 status = o2hb_register_callback(dlm->name, &dlm->dlm_hb_up);
1727 if (status)
1728 goto bail;
1729
1730 status = o2net_register_handler(DLM_MASTER_REQUEST_MSG, dlm->key,
1731 sizeof(struct dlm_master_request),
1732 dlm_master_request_handler,
1733 dlm, NULL, &dlm->dlm_domain_handlers);
1734 if (status)
1735 goto bail;
1736
1737 status = o2net_register_handler(DLM_ASSERT_MASTER_MSG, dlm->key,
1738 sizeof(struct dlm_assert_master),
1739 dlm_assert_master_handler,
1740 dlm, dlm_assert_master_post_handler,
1741 &dlm->dlm_domain_handlers);
1742 if (status)
1743 goto bail;
1744
1745 status = o2net_register_handler(DLM_CREATE_LOCK_MSG, dlm->key,
1746 sizeof(struct dlm_create_lock),
1747 dlm_create_lock_handler,
1748 dlm, NULL, &dlm->dlm_domain_handlers);
1749 if (status)
1750 goto bail;
1751
1752 status = o2net_register_handler(DLM_CONVERT_LOCK_MSG, dlm->key,
1753 DLM_CONVERT_LOCK_MAX_LEN,
1754 dlm_convert_lock_handler,
1755 dlm, NULL, &dlm->dlm_domain_handlers);
1756 if (status)
1757 goto bail;
1758
1759 status = o2net_register_handler(DLM_UNLOCK_LOCK_MSG, dlm->key,
1760 DLM_UNLOCK_LOCK_MAX_LEN,
1761 dlm_unlock_lock_handler,
1762 dlm, NULL, &dlm->dlm_domain_handlers);
1763 if (status)
1764 goto bail;
1765
1766 status = o2net_register_handler(DLM_PROXY_AST_MSG, dlm->key,
1767 DLM_PROXY_AST_MAX_LEN,
1768 dlm_proxy_ast_handler,
1769 dlm, NULL, &dlm->dlm_domain_handlers);
1770 if (status)
1771 goto bail;
1772
1773 status = o2net_register_handler(DLM_EXIT_DOMAIN_MSG, dlm->key,
1774 sizeof(struct dlm_exit_domain),
1775 dlm_exit_domain_handler,
1776 dlm, NULL, &dlm->dlm_domain_handlers);
1777 if (status)
1778 goto bail;
1779
1780 status = o2net_register_handler(DLM_DEREF_LOCKRES_MSG, dlm->key,
1781 sizeof(struct dlm_deref_lockres),
1782 dlm_deref_lockres_handler,
1783 dlm, NULL, &dlm->dlm_domain_handlers);
1784 if (status)
1785 goto bail;
1786
1787 status = o2net_register_handler(DLM_MIGRATE_REQUEST_MSG, dlm->key,
1788 sizeof(struct dlm_migrate_request),
1789 dlm_migrate_request_handler,
1790 dlm, NULL, &dlm->dlm_domain_handlers);
1791 if (status)
1792 goto bail;
1793
1794 status = o2net_register_handler(DLM_MIG_LOCKRES_MSG, dlm->key,
1795 DLM_MIG_LOCKRES_MAX_LEN,
1796 dlm_mig_lockres_handler,
1797 dlm, NULL, &dlm->dlm_domain_handlers);
1798 if (status)
1799 goto bail;
1800
1801 status = o2net_register_handler(DLM_MASTER_REQUERY_MSG, dlm->key,
1802 sizeof(struct dlm_master_requery),
1803 dlm_master_requery_handler,
1804 dlm, NULL, &dlm->dlm_domain_handlers);
1805 if (status)
1806 goto bail;
1807
1808 status = o2net_register_handler(DLM_LOCK_REQUEST_MSG, dlm->key,
1809 sizeof(struct dlm_lock_request),
1810 dlm_request_all_locks_handler,
1811 dlm, NULL, &dlm->dlm_domain_handlers);
1812 if (status)
1813 goto bail;
1814
1815 status = o2net_register_handler(DLM_RECO_DATA_DONE_MSG, dlm->key,
1816 sizeof(struct dlm_reco_data_done),
1817 dlm_reco_data_done_handler,
1818 dlm, NULL, &dlm->dlm_domain_handlers);
1819 if (status)
1820 goto bail;
1821
1822 status = o2net_register_handler(DLM_BEGIN_RECO_MSG, dlm->key,
1823 sizeof(struct dlm_begin_reco),
1824 dlm_begin_reco_handler,
1825 dlm, NULL, &dlm->dlm_domain_handlers);
1826 if (status)
1827 goto bail;
1828
1829 status = o2net_register_handler(DLM_FINALIZE_RECO_MSG, dlm->key,
1830 sizeof(struct dlm_finalize_reco),
1831 dlm_finalize_reco_handler,
1832 dlm, NULL, &dlm->dlm_domain_handlers);
1833 if (status)
1834 goto bail;
1835
1836 status = o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG, dlm->key,
1837 sizeof(struct dlm_exit_domain),
1838 dlm_begin_exit_domain_handler,
1839 dlm, NULL, &dlm->dlm_domain_handlers);
1840 if (status)
1841 goto bail;
1842
1843 status = o2net_register_handler(DLM_DEREF_LOCKRES_DONE, dlm->key,
1844 sizeof(struct dlm_deref_lockres_done),
1845 dlm_deref_lockres_done_handler,
1846 dlm, NULL, &dlm->dlm_domain_handlers);
1847 bail:
1848 if (status)
1849 dlm_unregister_domain_handlers(dlm);
1850
1851 return status;
1852 }
1853
1854 static int dlm_join_domain(struct dlm_ctxt *dlm)
1855 {
1856 int status;
1857 unsigned int backoff;
1858 unsigned int total_backoff = 0;
1859 char wq_name[O2NM_MAX_NAME_LEN];
1860
1861 BUG_ON(!dlm);
1862
1863 mlog(0, "Join domain %s\n", dlm->name);
1864
1865 status = dlm_register_domain_handlers(dlm);
1866 if (status) {
1867 mlog_errno(status);
1868 goto bail;
1869 }
1870
1871 status = dlm_launch_thread(dlm);
1872 if (status < 0) {
1873 mlog_errno(status);
1874 goto bail;
1875 }
1876
1877 status = dlm_launch_recovery_thread(dlm);
1878 if (status < 0) {
1879 mlog_errno(status);
1880 goto bail;
1881 }
1882
1883 dlm_debug_init(dlm);
1884
1885 snprintf(wq_name, O2NM_MAX_NAME_LEN, "dlm_wq-%s", dlm->name);
1886 dlm->dlm_worker = alloc_workqueue(wq_name, WQ_MEM_RECLAIM, 0);
1887 if (!dlm->dlm_worker) {
1888 status = -ENOMEM;
1889 mlog_errno(status);
1890 goto bail;
1891 }
1892
1893 do {
1894 status = dlm_try_to_join_domain(dlm);
1895
1896 /* If we're racing another node to the join, then we
1897 * need to back off temporarily and let them
1898 * complete. */
1899 #define DLM_JOIN_TIMEOUT_MSECS 90000
1900 if (status == -EAGAIN) {
1901 if (signal_pending(current)) {
1902 status = -ERESTARTSYS;
1903 goto bail;
1904 }
1905
1906 if (total_backoff > DLM_JOIN_TIMEOUT_MSECS) {
1907 status = -ERESTARTSYS;
1908 mlog(ML_NOTICE, "Timed out joining dlm domain "
1909 "%s after %u msecs\n", dlm->name,
1910 total_backoff);
1911 goto bail;
1912 }
1913
1914 /*
1915 * <chip> After you!
1916 * <dale> No, after you!
1917 * <chip> I insist!
1918 * <dale> But you first!
1919 * ...
1920 */
1921 backoff = (unsigned int)(jiffies & 0x3);
1922 backoff *= DLM_DOMAIN_BACKOFF_MS;
1923 total_backoff += backoff;
1924 mlog(0, "backoff %d\n", backoff);
1925 msleep(backoff);
1926 }
1927 } while (status == -EAGAIN);
1928
1929 if (status < 0) {
1930 mlog_errno(status);
1931 goto bail;
1932 }
1933
1934 status = 0;
1935 bail:
1936 wake_up(&dlm_domain_events);
1937
1938 if (status) {
1939 dlm_unregister_domain_handlers(dlm);
1940 dlm_complete_thread(dlm);
1941 dlm_complete_recovery_thread(dlm);
1942 dlm_destroy_dlm_worker(dlm);
1943 }
1944
1945 return status;
1946 }
1947
1948 static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
1949 u32 key)
1950 {
1951 int i;
1952 int ret;
1953 struct dlm_ctxt *dlm = NULL;
1954
1955 dlm = kzalloc(sizeof(*dlm), GFP_KERNEL);
1956 if (!dlm) {
1957 ret = -ENOMEM;
1958 mlog_errno(ret);
1959 goto leave;
1960 }
1961
1962 dlm->name = kstrdup(domain, GFP_KERNEL);
1963 if (dlm->name == NULL) {
1964 ret = -ENOMEM;
1965 mlog_errno(ret);
1966 goto leave;
1967 }
1968
1969 dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
1970 if (!dlm->lockres_hash) {
1971 ret = -ENOMEM;
1972 mlog_errno(ret);
1973 goto leave;
1974 }
1975
1976 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1977 INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
1978
1979 dlm->master_hash = (struct hlist_head **)
1980 dlm_alloc_pagevec(DLM_HASH_PAGES);
1981 if (!dlm->master_hash) {
1982 ret = -ENOMEM;
1983 mlog_errno(ret);
1984 goto leave;
1985 }
1986
1987 for (i = 0; i < DLM_HASH_BUCKETS; i++)
1988 INIT_HLIST_HEAD(dlm_master_hash(dlm, i));
1989
1990 dlm->key = key;
1991 dlm->node_num = o2nm_this_node();
1992
1993 dlm_create_debugfs_subroot(dlm);
1994
1995 spin_lock_init(&dlm->spinlock);
1996 spin_lock_init(&dlm->master_lock);
1997 spin_lock_init(&dlm->ast_lock);
1998 spin_lock_init(&dlm->track_lock);
1999 INIT_LIST_HEAD(&dlm->list);
2000 INIT_LIST_HEAD(&dlm->dirty_list);
2001 INIT_LIST_HEAD(&dlm->reco.resources);
2002 INIT_LIST_HEAD(&dlm->reco.node_data);
2003 INIT_LIST_HEAD(&dlm->purge_list);
2004 INIT_LIST_HEAD(&dlm->dlm_domain_handlers);
2005 INIT_LIST_HEAD(&dlm->tracking_list);
2006 dlm->reco.state = 0;
2007
2008 INIT_LIST_HEAD(&dlm->pending_asts);
2009 INIT_LIST_HEAD(&dlm->pending_basts);
2010
2011 mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
2012 dlm->recovery_map, &(dlm->recovery_map[0]));
2013
2014 memset(dlm->recovery_map, 0, sizeof(dlm->recovery_map));
2015 memset(dlm->live_nodes_map, 0, sizeof(dlm->live_nodes_map));
2016 memset(dlm->domain_map, 0, sizeof(dlm->domain_map));
2017
2018 dlm->dlm_thread_task = NULL;
2019 dlm->dlm_reco_thread_task = NULL;
2020 dlm->dlm_worker = NULL;
2021 init_waitqueue_head(&dlm->dlm_thread_wq);
2022 init_waitqueue_head(&dlm->dlm_reco_thread_wq);
2023 init_waitqueue_head(&dlm->reco.event);
2024 init_waitqueue_head(&dlm->ast_wq);
2025 init_waitqueue_head(&dlm->migration_wq);
2026 INIT_LIST_HEAD(&dlm->mle_hb_events);
2027
2028 dlm->joining_node = DLM_LOCK_RES_OWNER_UNKNOWN;
2029 init_waitqueue_head(&dlm->dlm_join_events);
2030
2031 dlm->migrate_done = 0;
2032
2033 dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
2034 dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
2035
2036 atomic_set(&dlm->res_tot_count, 0);
2037 atomic_set(&dlm->res_cur_count, 0);
2038 for (i = 0; i < DLM_MLE_NUM_TYPES; ++i) {
2039 atomic_set(&dlm->mle_tot_count[i], 0);
2040 atomic_set(&dlm->mle_cur_count[i], 0);
2041 }
2042
2043 spin_lock_init(&dlm->work_lock);
2044 INIT_LIST_HEAD(&dlm->work_list);
2045 INIT_WORK(&dlm->dispatched_work, dlm_dispatch_work);
2046
2047 kref_init(&dlm->dlm_refs);
2048 dlm->dlm_state = DLM_CTXT_NEW;
2049
2050 INIT_LIST_HEAD(&dlm->dlm_eviction_callbacks);
2051
2052 mlog(0, "context init: refcount %u\n",
2053 kref_read(&dlm->dlm_refs));
2054
2055 ret = 0;
2056 leave:
2057 if (ret < 0 && dlm) {
2058 if (dlm->master_hash)
2059 dlm_free_pagevec((void **)dlm->master_hash,
2060 DLM_HASH_PAGES);
2061
2062 if (dlm->lockres_hash)
2063 dlm_free_pagevec((void **)dlm->lockres_hash,
2064 DLM_HASH_PAGES);
2065
2066 kfree(dlm->name);
2067 kfree(dlm);
2068 dlm = NULL;
2069 }
2070 return dlm;
2071 }
2072
2073 /*
2074 * Compare a requested locking protocol version against the current one.
2075 *
2076 * If the major numbers are different, they are incompatible.
2077 * If the current minor is greater than the request, they are incompatible.
2078 * If the current minor is less than or equal to the request, they are
2079 * compatible, and the requester should run at the current minor version.
2080 */
2081 static int dlm_protocol_compare(struct dlm_protocol_version *existing,
2082 struct dlm_protocol_version *request)
2083 {
2084 if (existing->pv_major != request->pv_major)
2085 return 1;
2086
2087 if (existing->pv_minor > request->pv_minor)
2088 return 1;
2089
2090 if (existing->pv_minor < request->pv_minor)
2091 request->pv_minor = existing->pv_minor;
2092
2093 return 0;
2094 }
2095
2096 /*
2097 * dlm_register_domain: one-time setup per "domain".
2098 *
2099 * The filesystem passes in the requested locking version via proto.
2100 * If registration was successful, proto will contain the negotiated
2101 * locking protocol.
2102 */
2103 struct dlm_ctxt * dlm_register_domain(const char *domain,
2104 u32 key,
2105 struct dlm_protocol_version *fs_proto)
2106 {
2107 int ret;
2108 struct dlm_ctxt *dlm = NULL;
2109 struct dlm_ctxt *new_ctxt = NULL;
2110
2111 if (strlen(domain) >= O2NM_MAX_NAME_LEN) {
2112 ret = -ENAMETOOLONG;
2113 mlog(ML_ERROR, "domain name length too long\n");
2114 goto leave;
2115 }
2116
2117 mlog(0, "register called for domain \"%s\"\n", domain);
2118
2119 retry:
2120 dlm = NULL;
2121 if (signal_pending(current)) {
2122 ret = -ERESTARTSYS;
2123 mlog_errno(ret);
2124 goto leave;
2125 }
2126
2127 spin_lock(&dlm_domain_lock);
2128
2129 dlm = __dlm_lookup_domain(domain);
2130 if (dlm) {
2131 if (dlm->dlm_state != DLM_CTXT_JOINED) {
2132 spin_unlock(&dlm_domain_lock);
2133
2134 mlog(0, "This ctxt is not joined yet!\n");
2135 wait_event_interruptible(dlm_domain_events,
2136 dlm_wait_on_domain_helper(
2137 domain));
2138 goto retry;
2139 }
2140
2141 if (dlm_protocol_compare(&dlm->fs_locking_proto, fs_proto)) {
2142 spin_unlock(&dlm_domain_lock);
2143 mlog(ML_ERROR,
2144 "Requested locking protocol version is not "
2145 "compatible with already registered domain "
2146 "\"%s\"\n", domain);
2147 ret = -EPROTO;
2148 goto leave;
2149 }
2150
2151 __dlm_get(dlm);
2152 dlm->num_joins++;
2153
2154 spin_unlock(&dlm_domain_lock);
2155
2156 ret = 0;
2157 goto leave;
2158 }
2159
2160 /* doesn't exist */
2161 if (!new_ctxt) {
2162 spin_unlock(&dlm_domain_lock);
2163
2164 new_ctxt = dlm_alloc_ctxt(domain, key);
2165 if (new_ctxt)
2166 goto retry;
2167
2168 ret = -ENOMEM;
2169 mlog_errno(ret);
2170 goto leave;
2171 }
2172
2173 /* a little variable switch-a-roo here... */
2174 dlm = new_ctxt;
2175 new_ctxt = NULL;
2176
2177 /* add the new domain */
2178 list_add_tail(&dlm->list, &dlm_domains);
2179 spin_unlock(&dlm_domain_lock);
2180
2181 /*
2182 * Pass the locking protocol version into the join. If the join
2183 * succeeds, it will have the negotiated protocol set.
2184 */
2185 dlm->dlm_locking_proto = dlm_protocol;
2186 dlm->fs_locking_proto = *fs_proto;
2187
2188 ret = dlm_join_domain(dlm);
2189 if (ret) {
2190 mlog_errno(ret);
2191 dlm_put(dlm);
2192 goto leave;
2193 }
2194
2195 /* Tell the caller what locking protocol we negotiated */
2196 *fs_proto = dlm->fs_locking_proto;
2197
2198 ret = 0;
2199 leave:
2200 if (new_ctxt)
2201 dlm_free_ctxt_mem(new_ctxt);
2202
2203 if (ret < 0)
2204 dlm = ERR_PTR(ret);
2205
2206 return dlm;
2207 }
2208 EXPORT_SYMBOL_GPL(dlm_register_domain);
2209
2210 static LIST_HEAD(dlm_join_handlers);
2211
2212 static void dlm_unregister_net_handlers(void)
2213 {
2214 o2net_unregister_handler_list(&dlm_join_handlers);
2215 }
2216
2217 static int dlm_register_net_handlers(void)
2218 {
2219 int status = 0;
2220
2221 status = o2net_register_handler(DLM_QUERY_JOIN_MSG, DLM_MOD_KEY,
2222 sizeof(struct dlm_query_join_request),
2223 dlm_query_join_handler,
2224 NULL, NULL, &dlm_join_handlers);
2225 if (status)
2226 goto bail;
2227
2228 status = o2net_register_handler(DLM_ASSERT_JOINED_MSG, DLM_MOD_KEY,
2229 sizeof(struct dlm_assert_joined),
2230 dlm_assert_joined_handler,
2231 NULL, NULL, &dlm_join_handlers);
2232 if (status)
2233 goto bail;
2234
2235 status = o2net_register_handler(DLM_CANCEL_JOIN_MSG, DLM_MOD_KEY,
2236 sizeof(struct dlm_cancel_join),
2237 dlm_cancel_join_handler,
2238 NULL, NULL, &dlm_join_handlers);
2239 if (status)
2240 goto bail;
2241
2242 status = o2net_register_handler(DLM_QUERY_REGION, DLM_MOD_KEY,
2243 sizeof(struct dlm_query_region),
2244 dlm_query_region_handler,
2245 NULL, NULL, &dlm_join_handlers);
2246
2247 if (status)
2248 goto bail;
2249
2250 status = o2net_register_handler(DLM_QUERY_NODEINFO, DLM_MOD_KEY,
2251 sizeof(struct dlm_query_nodeinfo),
2252 dlm_query_nodeinfo_handler,
2253 NULL, NULL, &dlm_join_handlers);
2254 bail:
2255 if (status < 0)
2256 dlm_unregister_net_handlers();
2257
2258 return status;
2259 }
2260
2261 /* Domain eviction callback handling.
2262 *
2263 * The file system requires notification of node death *before* the
2264 * dlm completes it's recovery work, otherwise it may be able to
2265 * acquire locks on resources requiring recovery. Since the dlm can
2266 * evict a node from it's domain *before* heartbeat fires, a similar
2267 * mechanism is required. */
2268
2269 /* Eviction is not expected to happen often, so a per-domain lock is
2270 * not necessary. Eviction callbacks are allowed to sleep for short
2271 * periods of time. */
2272 static DECLARE_RWSEM(dlm_callback_sem);
2273
2274 void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt *dlm,
2275 int node_num)
2276 {
2277 struct dlm_eviction_cb *cb;
2278
2279 down_read(&dlm_callback_sem);
2280 list_for_each_entry(cb, &dlm->dlm_eviction_callbacks, ec_item) {
2281 cb->ec_func(node_num, cb->ec_data);
2282 }
2283 up_read(&dlm_callback_sem);
2284 }
2285
2286 void dlm_setup_eviction_cb(struct dlm_eviction_cb *cb,
2287 dlm_eviction_func *f,
2288 void *data)
2289 {
2290 INIT_LIST_HEAD(&cb->ec_item);
2291 cb->ec_func = f;
2292 cb->ec_data = data;
2293 }
2294 EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb);
2295
2296 void dlm_register_eviction_cb(struct dlm_ctxt *dlm,
2297 struct dlm_eviction_cb *cb)
2298 {
2299 down_write(&dlm_callback_sem);
2300 list_add_tail(&cb->ec_item, &dlm->dlm_eviction_callbacks);
2301 up_write(&dlm_callback_sem);
2302 }
2303 EXPORT_SYMBOL_GPL(dlm_register_eviction_cb);
2304
2305 void dlm_unregister_eviction_cb(struct dlm_eviction_cb *cb)
2306 {
2307 down_write(&dlm_callback_sem);
2308 list_del_init(&cb->ec_item);
2309 up_write(&dlm_callback_sem);
2310 }
2311 EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb);
2312
2313 static int __init dlm_init(void)
2314 {
2315 int status;
2316
2317 status = dlm_init_mle_cache();
2318 if (status) {
2319 mlog(ML_ERROR, "Could not create o2dlm_mle slabcache\n");
2320 goto error;
2321 }
2322
2323 status = dlm_init_master_caches();
2324 if (status) {
2325 mlog(ML_ERROR, "Could not create o2dlm_lockres and "
2326 "o2dlm_lockname slabcaches\n");
2327 goto error;
2328 }
2329
2330 status = dlm_init_lock_cache();
2331 if (status) {
2332 mlog(ML_ERROR, "Count not create o2dlm_lock slabcache\n");
2333 goto error;
2334 }
2335
2336 status = dlm_register_net_handlers();
2337 if (status) {
2338 mlog(ML_ERROR, "Unable to register network handlers\n");
2339 goto error;
2340 }
2341
2342 dlm_create_debugfs_root();
2343
2344 return 0;
2345 error:
2346 dlm_unregister_net_handlers();
2347 dlm_destroy_lock_cache();
2348 dlm_destroy_master_caches();
2349 dlm_destroy_mle_cache();
2350 return -1;
2351 }
2352
2353 static void __exit dlm_exit (void)
2354 {
2355 dlm_destroy_debugfs_root();
2356 dlm_unregister_net_handlers();
2357 dlm_destroy_lock_cache();
2358 dlm_destroy_master_caches();
2359 dlm_destroy_mle_cache();
2360 }
2361
2362 MODULE_AUTHOR("Oracle");
2363 MODULE_LICENSE("GPL");
2364 MODULE_DESCRIPTION("OCFS2 Distributed Lock Management");
2365
2366 module_init(dlm_init);
2367 module_exit(dlm_exit);
Linux with added FPC-III support