1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
6 * defines domain join / leave apis
8 * Copyright (C) 2004 Oracle. All rights reserved.
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.
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.
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.
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>
37 #include "cluster/heartbeat.h"
38 #include "cluster/nodemanager.h"
39 #include "cluster/tcp.h"
42 #include "dlmcommon.h"
43 #include "dlmdomain.h"
46 #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
47 #include "cluster/masklog.h"
50 * ocfs2 node maps are array of long int, which limits to send them freely
51 * across the wire due to endianness issues. To workaround this, we convert
52 * long ints to byte arrays. Following 3 routines are helper functions to
53 * set/test/copy bits within those array of bytes
55 static inline void byte_set_bit(u8 nr
, u8 map
[])
57 map
[nr
>> 3] |= (1UL << (nr
& 7));
60 static inline int byte_test_bit(u8 nr
, u8 map
[])
62 return ((1UL << (nr
& 7)) & (map
[nr
>> 3])) != 0;
65 static inline void byte_copymap(u8 dmap
[], unsigned long smap
[],
73 memset(dmap
, 0, ((sz
+ 7) >> 3));
74 for (nn
= 0 ; nn
< sz
; nn
++)
75 if (test_bit(nn
, smap
))
76 byte_set_bit(nn
, dmap
);
79 static void dlm_free_pagevec(void **vec
, int pages
)
82 free_page((unsigned long)vec
[pages
]);
86 static void **dlm_alloc_pagevec(int pages
)
88 void **vec
= kmalloc(pages
* sizeof(void *), GFP_KERNEL
);
94 for (i
= 0; i
< pages
; i
++)
95 if (!(vec
[i
] = (void *)__get_free_page(GFP_KERNEL
)))
98 mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
99 pages
, (unsigned long)DLM_HASH_PAGES
,
100 (unsigned long)DLM_BUCKETS_PER_PAGE
);
103 dlm_free_pagevec(vec
, i
);
109 * spinlock lock ordering: if multiple locks are needed, obey this ordering:
111 * struct dlm_ctxt->spinlock
112 * struct dlm_lock_resource->spinlock
113 * struct dlm_ctxt->master_lock
114 * struct dlm_ctxt->ast_lock
115 * dlm_master_list_entry->spinlock
120 DEFINE_SPINLOCK(dlm_domain_lock
);
121 LIST_HEAD(dlm_domains
);
122 static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events
);
125 * The supported protocol version for DLM communication. Running domains
126 * will have a negotiated version with the same major number and a minor
127 * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
128 * be used to determine what a running domain is actually using.
130 * New in version 1.1:
131 * - Message DLM_QUERY_REGION added to support global heartbeat
132 * - Message DLM_QUERY_NODEINFO added to allow online node removes
133 * New in version 1.2:
134 * - Message DLM_BEGIN_EXIT_DOMAIN_MSG added to mark start of exit domain
136 static const struct dlm_protocol_version dlm_protocol
= {
141 #define DLM_DOMAIN_BACKOFF_MS 200
143 static int dlm_query_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
145 static int dlm_assert_joined_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
147 static int dlm_cancel_join_handler(struct o2net_msg
*msg
, u32 len
, void *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
,
153 static int dlm_protocol_compare(struct dlm_protocol_version
*existing
,
154 struct dlm_protocol_version
*request
);
156 static void dlm_unregister_domain_handlers(struct dlm_ctxt
*dlm
);
158 void __dlm_unhash_lockres(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
)
160 if (hlist_unhashed(&res
->hash_node
))
163 mlog(0, "%s: Unhash res %.*s\n", dlm
->name
, res
->lockname
.len
,
165 hlist_del_init(&res
->hash_node
);
166 dlm_lockres_put(res
);
169 void __dlm_insert_lockres(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
)
171 struct hlist_head
*bucket
;
174 assert_spin_locked(&dlm
->spinlock
);
177 bucket
= dlm_lockres_hash(dlm
, q
->hash
);
179 /* get a reference for our hashtable */
180 dlm_lockres_get(res
);
182 hlist_add_head(&res
->hash_node
, bucket
);
184 mlog(0, "%s: Hash res %.*s\n", dlm
->name
, res
->lockname
.len
,
188 struct dlm_lock_resource
* __dlm_lookup_lockres_full(struct dlm_ctxt
*dlm
,
193 struct hlist_head
*bucket
;
194 struct dlm_lock_resource
*res
;
196 mlog(0, "%.*s\n", len
, name
);
198 assert_spin_locked(&dlm
->spinlock
);
200 bucket
= dlm_lockres_hash(dlm
, hash
);
202 hlist_for_each_entry(res
, bucket
, hash_node
) {
203 if (res
->lockname
.name
[0] != name
[0])
205 if (unlikely(res
->lockname
.len
!= len
))
207 if (memcmp(res
->lockname
.name
+ 1, name
+ 1, len
- 1))
209 dlm_lockres_get(res
);
215 /* intended to be called by functions which do not care about lock
216 * resources which are being purged (most net _handler functions).
217 * this will return NULL for any lock resource which is found but
218 * currently in the process of dropping its mastery reference.
219 * use __dlm_lookup_lockres_full when you need the lock resource
220 * regardless (e.g. dlm_get_lock_resource) */
221 struct dlm_lock_resource
* __dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
226 struct dlm_lock_resource
*res
= NULL
;
228 mlog(0, "%.*s\n", len
, name
);
230 assert_spin_locked(&dlm
->spinlock
);
232 res
= __dlm_lookup_lockres_full(dlm
, name
, len
, hash
);
234 spin_lock(&res
->spinlock
);
235 if (res
->state
& DLM_LOCK_RES_DROPPING_REF
) {
236 spin_unlock(&res
->spinlock
);
237 dlm_lockres_put(res
);
240 spin_unlock(&res
->spinlock
);
246 struct dlm_lock_resource
* dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
250 struct dlm_lock_resource
*res
;
251 unsigned int hash
= dlm_lockid_hash(name
, len
);
253 spin_lock(&dlm
->spinlock
);
254 res
= __dlm_lookup_lockres(dlm
, name
, len
, hash
);
255 spin_unlock(&dlm
->spinlock
);
259 static struct dlm_ctxt
* __dlm_lookup_domain_full(const char *domain
, int len
)
261 struct dlm_ctxt
*tmp
;
263 assert_spin_locked(&dlm_domain_lock
);
265 /* tmp->name here is always NULL terminated,
266 * but domain may not be! */
267 list_for_each_entry(tmp
, &dlm_domains
, list
) {
268 if (strlen(tmp
->name
) == len
&&
269 memcmp(tmp
->name
, domain
, len
)==0)
276 /* For null terminated domain strings ONLY */
277 static struct dlm_ctxt
* __dlm_lookup_domain(const char *domain
)
279 assert_spin_locked(&dlm_domain_lock
);
281 return __dlm_lookup_domain_full(domain
, strlen(domain
));
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
)
291 struct dlm_ctxt
*tmp
= NULL
;
293 spin_lock(&dlm_domain_lock
);
295 tmp
= __dlm_lookup_domain(domain
);
298 else if (tmp
->dlm_state
== DLM_CTXT_JOINED
)
301 spin_unlock(&dlm_domain_lock
);
305 static void dlm_free_ctxt_mem(struct dlm_ctxt
*dlm
)
307 dlm_destroy_debugfs_subroot(dlm
);
309 if (dlm
->lockres_hash
)
310 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
312 if (dlm
->master_hash
)
313 dlm_free_pagevec((void **)dlm
->master_hash
, DLM_HASH_PAGES
);
319 /* A little strange - this function will be called while holding
320 * dlm_domain_lock and is expected to be holding it on the way out. We
321 * will however drop and reacquire it multiple times */
322 static void dlm_ctxt_release(struct kref
*kref
)
324 struct dlm_ctxt
*dlm
;
326 dlm
= container_of(kref
, struct dlm_ctxt
, dlm_refs
);
328 BUG_ON(dlm
->num_joins
);
329 BUG_ON(dlm
->dlm_state
== DLM_CTXT_JOINED
);
331 /* we may still be in the list if we hit an error during join. */
332 list_del_init(&dlm
->list
);
334 spin_unlock(&dlm_domain_lock
);
336 mlog(0, "freeing memory from domain %s\n", dlm
->name
);
338 wake_up(&dlm_domain_events
);
340 dlm_free_ctxt_mem(dlm
);
342 spin_lock(&dlm_domain_lock
);
345 void dlm_put(struct dlm_ctxt
*dlm
)
347 spin_lock(&dlm_domain_lock
);
348 kref_put(&dlm
->dlm_refs
, dlm_ctxt_release
);
349 spin_unlock(&dlm_domain_lock
);
352 static void __dlm_get(struct dlm_ctxt
*dlm
)
354 kref_get(&dlm
->dlm_refs
);
357 /* given a questionable reference to a dlm object, gets a reference if
358 * it can find it in the list, otherwise returns NULL in which case
359 * you shouldn't trust your pointer. */
360 struct dlm_ctxt
*dlm_grab(struct dlm_ctxt
*dlm
)
362 struct dlm_ctxt
*target
;
363 struct dlm_ctxt
*ret
= NULL
;
365 spin_lock(&dlm_domain_lock
);
367 list_for_each_entry(target
, &dlm_domains
, list
) {
375 spin_unlock(&dlm_domain_lock
);
380 int dlm_domain_fully_joined(struct dlm_ctxt
*dlm
)
384 spin_lock(&dlm_domain_lock
);
385 ret
= (dlm
->dlm_state
== DLM_CTXT_JOINED
) ||
386 (dlm
->dlm_state
== DLM_CTXT_IN_SHUTDOWN
);
387 spin_unlock(&dlm_domain_lock
);
392 static void dlm_destroy_dlm_worker(struct dlm_ctxt
*dlm
)
394 if (dlm
->dlm_worker
) {
395 flush_workqueue(dlm
->dlm_worker
);
396 destroy_workqueue(dlm
->dlm_worker
);
397 dlm
->dlm_worker
= NULL
;
401 static void dlm_complete_dlm_shutdown(struct dlm_ctxt
*dlm
)
403 dlm_unregister_domain_handlers(dlm
);
404 dlm_debug_shutdown(dlm
);
405 dlm_complete_thread(dlm
);
406 dlm_complete_recovery_thread(dlm
);
407 dlm_destroy_dlm_worker(dlm
);
409 /* We've left the domain. Now we can take ourselves out of the
410 * list and allow the kref stuff to help us free the
412 spin_lock(&dlm_domain_lock
);
413 list_del_init(&dlm
->list
);
414 spin_unlock(&dlm_domain_lock
);
416 /* Wake up anyone waiting for us to remove this domain */
417 wake_up(&dlm_domain_events
);
420 static int dlm_migrate_all_locks(struct dlm_ctxt
*dlm
)
422 int i
, num
, n
, ret
= 0;
423 struct dlm_lock_resource
*res
;
424 struct hlist_node
*iter
;
425 struct hlist_head
*bucket
;
428 mlog(0, "Migrating locks from domain %s\n", dlm
->name
);
431 spin_lock(&dlm
->spinlock
);
432 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++) {
435 bucket
= dlm_lockres_hash(dlm
, i
);
436 iter
= bucket
->first
;
439 res
= hlist_entry(iter
, struct dlm_lock_resource
,
441 dlm_lockres_get(res
);
442 /* migrate, if necessary. this will drop the dlm
443 * spinlock and retake it if it does migration. */
444 dropped
= dlm_empty_lockres(dlm
, res
);
446 spin_lock(&res
->spinlock
);
448 __dlm_lockres_calc_usage(dlm
, res
);
450 iter
= res
->hash_node
.next
;
451 spin_unlock(&res
->spinlock
);
453 dlm_lockres_put(res
);
456 cond_resched_lock(&dlm
->spinlock
);
460 cond_resched_lock(&dlm
->spinlock
);
463 spin_unlock(&dlm
->spinlock
);
464 wake_up(&dlm
->dlm_thread_wq
);
466 /* let the dlm thread take care of purging, keep scanning until
467 * nothing remains in the hash */
469 mlog(0, "%s: %d lock resources in hash last pass\n",
473 mlog(0, "DONE Migrating locks from domain %s\n", dlm
->name
);
477 static int dlm_no_joining_node(struct dlm_ctxt
*dlm
)
481 spin_lock(&dlm
->spinlock
);
482 ret
= dlm
->joining_node
== DLM_LOCK_RES_OWNER_UNKNOWN
;
483 spin_unlock(&dlm
->spinlock
);
488 static int dlm_begin_exit_domain_handler(struct o2net_msg
*msg
, u32 len
,
489 void *data
, void **ret_data
)
491 struct dlm_ctxt
*dlm
= data
;
493 struct dlm_exit_domain
*exit_msg
= (struct dlm_exit_domain
*) msg
->buf
;
498 node
= exit_msg
->node_idx
;
499 mlog(0, "%s: Node %u sent a begin exit domain message\n", dlm
->name
, node
);
501 spin_lock(&dlm
->spinlock
);
502 set_bit(node
, dlm
->exit_domain_map
);
503 spin_unlock(&dlm
->spinlock
);
510 static void dlm_mark_domain_leaving(struct dlm_ctxt
*dlm
)
512 /* Yikes, a double spinlock! I need domain_lock for the dlm
513 * state and the dlm spinlock for join state... Sorry! */
515 spin_lock(&dlm_domain_lock
);
516 spin_lock(&dlm
->spinlock
);
518 if (dlm
->joining_node
!= DLM_LOCK_RES_OWNER_UNKNOWN
) {
519 mlog(0, "Node %d is joining, we wait on it.\n",
521 spin_unlock(&dlm
->spinlock
);
522 spin_unlock(&dlm_domain_lock
);
524 wait_event(dlm
->dlm_join_events
, dlm_no_joining_node(dlm
));
528 dlm
->dlm_state
= DLM_CTXT_LEAVING
;
529 spin_unlock(&dlm
->spinlock
);
530 spin_unlock(&dlm_domain_lock
);
533 static void __dlm_print_nodes(struct dlm_ctxt
*dlm
)
535 int node
= -1, num
= 0;
537 assert_spin_locked(&dlm
->spinlock
);
540 while ((node
= find_next_bit(dlm
->domain_map
, O2NM_MAX_NODES
,
541 node
+ 1)) < O2NM_MAX_NODES
) {
545 printk(") %u nodes\n", num
);
548 static int dlm_exit_domain_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
551 struct dlm_ctxt
*dlm
= data
;
553 struct dlm_exit_domain
*exit_msg
= (struct dlm_exit_domain
*) msg
->buf
;
555 mlog(0, "%p %u %p", msg
, len
, data
);
560 node
= exit_msg
->node_idx
;
562 spin_lock(&dlm
->spinlock
);
563 clear_bit(node
, dlm
->domain_map
);
564 clear_bit(node
, dlm
->exit_domain_map
);
565 printk(KERN_NOTICE
"o2dlm: Node %u leaves domain %s ", node
, dlm
->name
);
566 __dlm_print_nodes(dlm
);
568 /* notify anything attached to the heartbeat events */
569 dlm_hb_event_notify_attached(dlm
, node
, 0);
571 spin_unlock(&dlm
->spinlock
);
578 static int dlm_send_one_domain_exit(struct dlm_ctxt
*dlm
, u32 msg_type
,
582 struct dlm_exit_domain leave_msg
;
584 mlog(0, "%s: Sending domain exit message %u to node %u\n", dlm
->name
,
587 memset(&leave_msg
, 0, sizeof(leave_msg
));
588 leave_msg
.node_idx
= dlm
->node_num
;
590 status
= o2net_send_message(msg_type
, dlm
->key
, &leave_msg
,
591 sizeof(leave_msg
), node
, NULL
);
593 mlog(ML_ERROR
, "Error %d sending domain exit message %u "
594 "to node %u on domain %s\n", status
, msg_type
, node
,
600 static void dlm_begin_exit_domain(struct dlm_ctxt
*dlm
)
604 /* Support for begin exit domain was added in 1.2 */
605 if (dlm
->dlm_locking_proto
.pv_major
== 1 &&
606 dlm
->dlm_locking_proto
.pv_minor
< 2)
610 * Unlike DLM_EXIT_DOMAIN_MSG, DLM_BEGIN_EXIT_DOMAIN_MSG is purely
611 * informational. Meaning if a node does not receive the message,
614 spin_lock(&dlm
->spinlock
);
616 node
= find_next_bit(dlm
->domain_map
, O2NM_MAX_NODES
, node
+ 1);
617 if (node
>= O2NM_MAX_NODES
)
619 if (node
== dlm
->node_num
)
622 spin_unlock(&dlm
->spinlock
);
623 dlm_send_one_domain_exit(dlm
, DLM_BEGIN_EXIT_DOMAIN_MSG
, node
);
624 spin_lock(&dlm
->spinlock
);
626 spin_unlock(&dlm
->spinlock
);
629 static void dlm_leave_domain(struct dlm_ctxt
*dlm
)
631 int node
, clear_node
, status
;
633 /* At this point we've migrated away all our locks and won't
634 * accept mastership of new ones. The dlm is responsible for
635 * almost nothing now. We make sure not to confuse any joining
636 * nodes and then commence shutdown procedure. */
638 spin_lock(&dlm
->spinlock
);
639 /* Clear ourselves from the domain map */
640 clear_bit(dlm
->node_num
, dlm
->domain_map
);
641 while ((node
= find_next_bit(dlm
->domain_map
, O2NM_MAX_NODES
,
642 0)) < O2NM_MAX_NODES
) {
643 /* Drop the dlm spinlock. This is safe wrt the domain_map.
644 * -nodes cannot be added now as the
645 * query_join_handlers knows to respond with OK_NO_MAP
646 * -we catch the right network errors if a node is
647 * removed from the map while we're sending him the
649 spin_unlock(&dlm
->spinlock
);
653 status
= dlm_send_one_domain_exit(dlm
, DLM_EXIT_DOMAIN_MSG
,
656 status
!= -ENOPROTOOPT
&&
657 status
!= -ENOTCONN
) {
658 mlog(ML_NOTICE
, "Error %d sending domain exit message "
659 "to node %d\n", status
, node
);
661 /* Not sure what to do here but lets sleep for
662 * a bit in case this was a transient
664 msleep(DLM_DOMAIN_BACKOFF_MS
);
668 spin_lock(&dlm
->spinlock
);
669 /* If we're not clearing the node bit then we intend
670 * to loop back around to try again. */
672 clear_bit(node
, dlm
->domain_map
);
674 spin_unlock(&dlm
->spinlock
);
677 int dlm_joined(struct dlm_ctxt
*dlm
)
681 spin_lock(&dlm_domain_lock
);
683 if (dlm
->dlm_state
== DLM_CTXT_JOINED
)
686 spin_unlock(&dlm_domain_lock
);
691 int dlm_shutting_down(struct dlm_ctxt
*dlm
)
695 spin_lock(&dlm_domain_lock
);
697 if (dlm
->dlm_state
== DLM_CTXT_IN_SHUTDOWN
)
700 spin_unlock(&dlm_domain_lock
);
705 void dlm_unregister_domain(struct dlm_ctxt
*dlm
)
708 struct dlm_lock_resource
*res
;
710 spin_lock(&dlm_domain_lock
);
711 BUG_ON(dlm
->dlm_state
!= DLM_CTXT_JOINED
);
712 BUG_ON(!dlm
->num_joins
);
715 if (!dlm
->num_joins
) {
716 /* We mark it "in shutdown" now so new register
717 * requests wait until we've completely left the
718 * domain. Don't use DLM_CTXT_LEAVING yet as we still
719 * want new domain joins to communicate with us at
720 * least until we've completed migration of our
722 dlm
->dlm_state
= DLM_CTXT_IN_SHUTDOWN
;
725 spin_unlock(&dlm_domain_lock
);
728 mlog(0, "shutting down domain %s\n", dlm
->name
);
729 dlm_begin_exit_domain(dlm
);
731 /* We changed dlm state, notify the thread */
732 dlm_kick_thread(dlm
, NULL
);
734 while (dlm_migrate_all_locks(dlm
)) {
735 /* Give dlm_thread time to purge the lockres' */
737 mlog(0, "%s: more migration to do\n", dlm
->name
);
740 /* This list should be empty. If not, print remaining lockres */
741 if (!list_empty(&dlm
->tracking_list
)) {
742 mlog(ML_ERROR
, "Following lockres' are still on the "
744 list_for_each_entry(res
, &dlm
->tracking_list
, tracking
)
745 dlm_print_one_lock_resource(res
);
748 dlm_mark_domain_leaving(dlm
);
749 dlm_leave_domain(dlm
);
750 printk(KERN_NOTICE
"o2dlm: Leaving domain %s\n", dlm
->name
);
751 dlm_force_free_mles(dlm
);
752 dlm_complete_dlm_shutdown(dlm
);
756 EXPORT_SYMBOL_GPL(dlm_unregister_domain
);
758 static int dlm_query_join_proto_check(char *proto_type
, int node
,
759 struct dlm_protocol_version
*ours
,
760 struct dlm_protocol_version
*request
)
763 struct dlm_protocol_version proto
= *request
;
765 if (!dlm_protocol_compare(ours
, &proto
)) {
767 "node %u wanted to join with %s locking protocol "
768 "%u.%u, we respond with %u.%u\n",
772 proto
.pv_major
, proto
.pv_minor
);
773 request
->pv_minor
= proto
.pv_minor
;
777 "Node %u wanted to join with %s locking "
778 "protocol %u.%u, but we have %u.%u, disallowing\n",
791 * struct dlm_query_join_packet is made up of four one-byte fields. They
792 * are effectively in big-endian order already. However, little-endian
793 * machines swap them before putting the packet on the wire (because
794 * query_join's response is a status, and that status is treated as a u32
795 * on the wire). Thus, a big-endian and little-endian machines will treat
796 * this structure differently.
798 * The solution is to have little-endian machines swap the structure when
799 * converting from the structure to the u32 representation. This will
800 * result in the structure having the correct format on the wire no matter
801 * the host endian format.
803 static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet
*packet
,
806 union dlm_query_join_response response
;
808 response
.packet
= *packet
;
809 *wire
= be32_to_cpu(response
.intval
);
812 static void dlm_query_join_wire_to_packet(u32 wire
,
813 struct dlm_query_join_packet
*packet
)
815 union dlm_query_join_response response
;
817 response
.intval
= cpu_to_be32(wire
);
818 *packet
= response
.packet
;
821 static int dlm_query_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
824 struct dlm_query_join_request
*query
;
825 struct dlm_query_join_packet packet
= {
826 .code
= JOIN_DISALLOW
,
828 struct dlm_ctxt
*dlm
= NULL
;
832 query
= (struct dlm_query_join_request
*) msg
->buf
;
834 mlog(0, "node %u wants to join domain %s\n", query
->node_idx
,
838 * If heartbeat doesn't consider the node live, tell it
839 * to back off and try again. This gives heartbeat a chance
842 if (!o2hb_check_node_heartbeating(query
->node_idx
)) {
843 mlog(0, "node %u is not in our live map yet\n",
846 packet
.code
= JOIN_DISALLOW
;
850 packet
.code
= JOIN_OK_NO_MAP
;
852 spin_lock(&dlm_domain_lock
);
853 dlm
= __dlm_lookup_domain_full(query
->domain
, query
->name_len
);
858 * There is a small window where the joining node may not see the
859 * node(s) that just left but still part of the cluster. DISALLOW
860 * join request if joining node has different node map.
863 while (nodenum
< O2NM_MAX_NODES
) {
864 if (test_bit(nodenum
, dlm
->domain_map
)) {
865 if (!byte_test_bit(nodenum
, query
->node_map
)) {
866 mlog(0, "disallow join as node %u does not "
867 "have node %u in its nodemap\n",
868 query
->node_idx
, nodenum
);
869 packet
.code
= JOIN_DISALLOW
;
876 /* Once the dlm ctxt is marked as leaving then we don't want
877 * to be put in someone's domain map.
878 * Also, explicitly disallow joining at certain troublesome
879 * times (ie. during recovery). */
880 if (dlm
&& dlm
->dlm_state
!= DLM_CTXT_LEAVING
) {
881 int bit
= query
->node_idx
;
882 spin_lock(&dlm
->spinlock
);
884 if (dlm
->dlm_state
== DLM_CTXT_NEW
&&
885 dlm
->joining_node
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
886 /*If this is a brand new context and we
887 * haven't started our join process yet, then
888 * the other node won the race. */
889 packet
.code
= JOIN_OK_NO_MAP
;
890 } else if (dlm
->joining_node
!= DLM_LOCK_RES_OWNER_UNKNOWN
) {
891 /* Disallow parallel joins. */
892 packet
.code
= JOIN_DISALLOW
;
893 } else if (dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
) {
894 mlog(0, "node %u trying to join, but recovery "
895 "is ongoing.\n", bit
);
896 packet
.code
= JOIN_DISALLOW
;
897 } else if (test_bit(bit
, dlm
->recovery_map
)) {
898 mlog(0, "node %u trying to join, but it "
899 "still needs recovery.\n", bit
);
900 packet
.code
= JOIN_DISALLOW
;
901 } else if (test_bit(bit
, dlm
->domain_map
)) {
902 mlog(0, "node %u trying to join, but it "
903 "is still in the domain! needs recovery?\n",
905 packet
.code
= JOIN_DISALLOW
;
907 /* Alright we're fully a part of this domain
908 * so we keep some state as to who's joining
909 * and indicate to him that needs to be fixed
912 /* Make sure we speak compatible locking protocols. */
913 if (dlm_query_join_proto_check("DLM", bit
,
914 &dlm
->dlm_locking_proto
,
915 &query
->dlm_proto
)) {
916 packet
.code
= JOIN_PROTOCOL_MISMATCH
;
917 } else if (dlm_query_join_proto_check("fs", bit
,
918 &dlm
->fs_locking_proto
,
920 packet
.code
= JOIN_PROTOCOL_MISMATCH
;
922 packet
.dlm_minor
= query
->dlm_proto
.pv_minor
;
923 packet
.fs_minor
= query
->fs_proto
.pv_minor
;
924 packet
.code
= JOIN_OK
;
925 __dlm_set_joining_node(dlm
, query
->node_idx
);
929 spin_unlock(&dlm
->spinlock
);
932 spin_unlock(&dlm_domain_lock
);
935 mlog(0, "We respond with %u\n", packet
.code
);
937 dlm_query_join_packet_to_wire(&packet
, &response
);
941 static int dlm_assert_joined_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
944 struct dlm_assert_joined
*assert;
945 struct dlm_ctxt
*dlm
= NULL
;
947 assert = (struct dlm_assert_joined
*) msg
->buf
;
949 mlog(0, "node %u asserts join on domain %s\n", assert->node_idx
,
952 spin_lock(&dlm_domain_lock
);
953 dlm
= __dlm_lookup_domain_full(assert->domain
, assert->name_len
);
954 /* XXX should we consider no dlm ctxt an error? */
956 spin_lock(&dlm
->spinlock
);
958 /* Alright, this node has officially joined our
959 * domain. Set him in the map and clean up our
960 * leftover join state. */
961 BUG_ON(dlm
->joining_node
!= assert->node_idx
);
963 if (dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
) {
964 mlog(0, "dlm recovery is ongoing, disallow join\n");
965 spin_unlock(&dlm
->spinlock
);
966 spin_unlock(&dlm_domain_lock
);
970 set_bit(assert->node_idx
, dlm
->domain_map
);
971 clear_bit(assert->node_idx
, dlm
->exit_domain_map
);
972 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
974 printk(KERN_NOTICE
"o2dlm: Node %u joins domain %s ",
975 assert->node_idx
, dlm
->name
);
976 __dlm_print_nodes(dlm
);
978 /* notify anything attached to the heartbeat events */
979 dlm_hb_event_notify_attached(dlm
, assert->node_idx
, 1);
981 spin_unlock(&dlm
->spinlock
);
983 spin_unlock(&dlm_domain_lock
);
988 static int dlm_match_regions(struct dlm_ctxt
*dlm
,
989 struct dlm_query_region
*qr
,
990 char *local
, int locallen
)
992 char *remote
= qr
->qr_regions
;
994 int localnr
, i
, j
, foundit
;
997 if (!o2hb_global_heartbeat_active()) {
998 if (qr
->qr_numregions
) {
999 mlog(ML_ERROR
, "Domain %s: Joining node %d has global "
1000 "heartbeat enabled but local node %d does not\n",
1001 qr
->qr_domain
, qr
->qr_node
, dlm
->node_num
);
1007 if (o2hb_global_heartbeat_active() && !qr
->qr_numregions
) {
1008 mlog(ML_ERROR
, "Domain %s: Local node %d has global "
1009 "heartbeat enabled but joining node %d does not\n",
1010 qr
->qr_domain
, dlm
->node_num
, qr
->qr_node
);
1016 for (i
= 0; i
< qr
->qr_numregions
; ++i
) {
1017 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN
, r
);
1018 r
+= O2HB_MAX_REGION_NAME_LEN
;
1021 localnr
= min(O2NM_MAX_REGIONS
, locallen
/O2HB_MAX_REGION_NAME_LEN
);
1022 localnr
= o2hb_get_all_regions(local
, (u8
)localnr
);
1024 /* compare local regions with remote */
1026 for (i
= 0; i
< localnr
; ++i
) {
1029 for (j
= 0; j
<= qr
->qr_numregions
; ++j
) {
1030 if (!memcmp(l
, r
, O2HB_MAX_REGION_NAME_LEN
)) {
1034 r
+= O2HB_MAX_REGION_NAME_LEN
;
1038 mlog(ML_ERROR
, "Domain %s: Region '%.*s' registered "
1039 "in local node %d but not in joining node %d\n",
1040 qr
->qr_domain
, O2HB_MAX_REGION_NAME_LEN
, l
,
1041 dlm
->node_num
, qr
->qr_node
);
1044 l
+= O2HB_MAX_REGION_NAME_LEN
;
1047 /* compare remote with local regions */
1049 for (i
= 0; i
< qr
->qr_numregions
; ++i
) {
1052 for (j
= 0; j
< localnr
; ++j
) {
1053 if (!memcmp(r
, l
, O2HB_MAX_REGION_NAME_LEN
)) {
1057 l
+= O2HB_MAX_REGION_NAME_LEN
;
1061 mlog(ML_ERROR
, "Domain %s: Region '%.*s' registered "
1062 "in joining node %d but not in local node %d\n",
1063 qr
->qr_domain
, O2HB_MAX_REGION_NAME_LEN
, r
,
1064 qr
->qr_node
, dlm
->node_num
);
1067 r
+= O2HB_MAX_REGION_NAME_LEN
;
1074 static int dlm_send_regions(struct dlm_ctxt
*dlm
, unsigned long *node_map
)
1076 struct dlm_query_region
*qr
= NULL
;
1077 int status
, ret
= 0, i
;
1080 if (find_next_bit(node_map
, O2NM_MAX_NODES
, 0) >= O2NM_MAX_NODES
)
1083 qr
= kzalloc(sizeof(struct dlm_query_region
), GFP_KERNEL
);
1090 qr
->qr_node
= dlm
->node_num
;
1091 qr
->qr_namelen
= strlen(dlm
->name
);
1092 memcpy(qr
->qr_domain
, dlm
->name
, qr
->qr_namelen
);
1093 /* if local hb, the numregions will be zero */
1094 if (o2hb_global_heartbeat_active())
1095 qr
->qr_numregions
= o2hb_get_all_regions(qr
->qr_regions
,
1099 for (i
= 0; i
< qr
->qr_numregions
; ++i
, p
+= O2HB_MAX_REGION_NAME_LEN
)
1100 mlog(0, "Region %.*s\n", O2HB_MAX_REGION_NAME_LEN
, p
);
1103 while ((i
= find_next_bit(node_map
, O2NM_MAX_NODES
,
1104 i
+ 1)) < O2NM_MAX_NODES
) {
1105 if (i
== dlm
->node_num
)
1108 mlog(0, "Sending regions to node %d\n", i
);
1110 ret
= o2net_send_message(DLM_QUERY_REGION
, DLM_MOD_KEY
, qr
,
1111 sizeof(struct dlm_query_region
),
1116 mlog(ML_ERROR
, "Region mismatch %d, node %d\n",
1127 static int dlm_query_region_handler(struct o2net_msg
*msg
, u32 len
,
1128 void *data
, void **ret_data
)
1130 struct dlm_query_region
*qr
;
1131 struct dlm_ctxt
*dlm
= NULL
;
1135 qr
= (struct dlm_query_region
*) msg
->buf
;
1137 mlog(0, "Node %u queries hb regions on domain %s\n", qr
->qr_node
,
1140 /* buffer used in dlm_mast_regions() */
1141 local
= kmalloc(sizeof(qr
->qr_regions
), GFP_KERNEL
);
1147 spin_lock(&dlm_domain_lock
);
1148 dlm
= __dlm_lookup_domain_full(qr
->qr_domain
, qr
->qr_namelen
);
1150 mlog(ML_ERROR
, "Node %d queried hb regions on domain %s "
1151 "before join domain\n", qr
->qr_node
, qr
->qr_domain
);
1152 goto out_domain_lock
;
1155 spin_lock(&dlm
->spinlock
);
1156 if (dlm
->joining_node
!= qr
->qr_node
) {
1157 mlog(ML_ERROR
, "Node %d queried hb regions on domain %s "
1158 "but joining node is %d\n", qr
->qr_node
, qr
->qr_domain
,
1163 /* Support for global heartbeat was added in 1.1 */
1164 if (dlm
->dlm_locking_proto
.pv_major
== 1 &&
1165 dlm
->dlm_locking_proto
.pv_minor
== 0) {
1166 mlog(ML_ERROR
, "Node %d queried hb regions on domain %s "
1167 "but active dlm protocol is %d.%d\n", qr
->qr_node
,
1168 qr
->qr_domain
, dlm
->dlm_locking_proto
.pv_major
,
1169 dlm
->dlm_locking_proto
.pv_minor
);
1173 status
= dlm_match_regions(dlm
, qr
, local
, sizeof(qr
->qr_regions
));
1176 spin_unlock(&dlm
->spinlock
);
1179 spin_unlock(&dlm_domain_lock
);
1186 static int dlm_match_nodes(struct dlm_ctxt
*dlm
, struct dlm_query_nodeinfo
*qn
)
1188 struct o2nm_node
*local
;
1189 struct dlm_node_info
*remote
;
1193 for (j
= 0; j
< qn
->qn_numnodes
; ++j
)
1194 mlog(0, "Node %3d, %pI4:%u\n", qn
->qn_nodes
[j
].ni_nodenum
,
1195 &(qn
->qn_nodes
[j
].ni_ipv4_address
),
1196 ntohs(qn
->qn_nodes
[j
].ni_ipv4_port
));
1198 for (i
= 0; i
< O2NM_MAX_NODES
&& !status
; ++i
) {
1199 local
= o2nm_get_node_by_num(i
);
1201 for (j
= 0; j
< qn
->qn_numnodes
; ++j
) {
1202 if (qn
->qn_nodes
[j
].ni_nodenum
== i
) {
1203 remote
= &(qn
->qn_nodes
[j
]);
1208 if (!local
&& !remote
)
1211 if ((local
&& !remote
) || (!local
&& remote
))
1215 ((remote
->ni_nodenum
!= local
->nd_num
) ||
1216 (remote
->ni_ipv4_port
!= local
->nd_ipv4_port
) ||
1217 (remote
->ni_ipv4_address
!= local
->nd_ipv4_address
)))
1221 if (remote
&& !local
)
1222 mlog(ML_ERROR
, "Domain %s: Node %d (%pI4:%u) "
1223 "registered in joining node %d but not in "
1224 "local node %d\n", qn
->qn_domain
,
1226 &(remote
->ni_ipv4_address
),
1227 ntohs(remote
->ni_ipv4_port
),
1228 qn
->qn_nodenum
, dlm
->node_num
);
1229 if (local
&& !remote
)
1230 mlog(ML_ERROR
, "Domain %s: Node %d (%pI4:%u) "
1231 "registered in local node %d but not in "
1232 "joining node %d\n", qn
->qn_domain
,
1233 local
->nd_num
, &(local
->nd_ipv4_address
),
1234 ntohs(local
->nd_ipv4_port
),
1235 dlm
->node_num
, qn
->qn_nodenum
);
1236 BUG_ON((!local
&& !remote
));
1240 o2nm_node_put(local
);
1246 static int dlm_send_nodeinfo(struct dlm_ctxt
*dlm
, unsigned long *node_map
)
1248 struct dlm_query_nodeinfo
*qn
= NULL
;
1249 struct o2nm_node
*node
;
1250 int ret
= 0, status
, count
, i
;
1252 if (find_next_bit(node_map
, O2NM_MAX_NODES
, 0) >= O2NM_MAX_NODES
)
1255 qn
= kzalloc(sizeof(struct dlm_query_nodeinfo
), GFP_KERNEL
);
1262 for (i
= 0, count
= 0; i
< O2NM_MAX_NODES
; ++i
) {
1263 node
= o2nm_get_node_by_num(i
);
1266 qn
->qn_nodes
[count
].ni_nodenum
= node
->nd_num
;
1267 qn
->qn_nodes
[count
].ni_ipv4_port
= node
->nd_ipv4_port
;
1268 qn
->qn_nodes
[count
].ni_ipv4_address
= node
->nd_ipv4_address
;
1269 mlog(0, "Node %3d, %pI4:%u\n", node
->nd_num
,
1270 &(node
->nd_ipv4_address
), ntohs(node
->nd_ipv4_port
));
1272 o2nm_node_put(node
);
1275 qn
->qn_nodenum
= dlm
->node_num
;
1276 qn
->qn_numnodes
= count
;
1277 qn
->qn_namelen
= strlen(dlm
->name
);
1278 memcpy(qn
->qn_domain
, dlm
->name
, qn
->qn_namelen
);
1281 while ((i
= find_next_bit(node_map
, O2NM_MAX_NODES
,
1282 i
+ 1)) < O2NM_MAX_NODES
) {
1283 if (i
== dlm
->node_num
)
1286 mlog(0, "Sending nodeinfo to node %d\n", i
);
1288 ret
= o2net_send_message(DLM_QUERY_NODEINFO
, DLM_MOD_KEY
,
1289 qn
, sizeof(struct dlm_query_nodeinfo
),
1294 mlog(ML_ERROR
, "node mismatch %d, node %d\n", ret
, i
);
1304 static int dlm_query_nodeinfo_handler(struct o2net_msg
*msg
, u32 len
,
1305 void *data
, void **ret_data
)
1307 struct dlm_query_nodeinfo
*qn
;
1308 struct dlm_ctxt
*dlm
= NULL
;
1309 int locked
= 0, status
= -EINVAL
;
1311 qn
= (struct dlm_query_nodeinfo
*) msg
->buf
;
1313 mlog(0, "Node %u queries nodes on domain %s\n", qn
->qn_nodenum
,
1316 spin_lock(&dlm_domain_lock
);
1317 dlm
= __dlm_lookup_domain_full(qn
->qn_domain
, qn
->qn_namelen
);
1319 mlog(ML_ERROR
, "Node %d queried nodes on domain %s before "
1320 "join domain\n", qn
->qn_nodenum
, qn
->qn_domain
);
1324 spin_lock(&dlm
->spinlock
);
1326 if (dlm
->joining_node
!= qn
->qn_nodenum
) {
1327 mlog(ML_ERROR
, "Node %d queried nodes on domain %s but "
1328 "joining node is %d\n", qn
->qn_nodenum
, qn
->qn_domain
,
1333 /* Support for node query was added in 1.1 */
1334 if (dlm
->dlm_locking_proto
.pv_major
== 1 &&
1335 dlm
->dlm_locking_proto
.pv_minor
== 0) {
1336 mlog(ML_ERROR
, "Node %d queried nodes on domain %s "
1337 "but active dlm protocol is %d.%d\n", qn
->qn_nodenum
,
1338 qn
->qn_domain
, dlm
->dlm_locking_proto
.pv_major
,
1339 dlm
->dlm_locking_proto
.pv_minor
);
1343 status
= dlm_match_nodes(dlm
, qn
);
1347 spin_unlock(&dlm
->spinlock
);
1348 spin_unlock(&dlm_domain_lock
);
1353 static int dlm_cancel_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
1356 struct dlm_cancel_join
*cancel
;
1357 struct dlm_ctxt
*dlm
= NULL
;
1359 cancel
= (struct dlm_cancel_join
*) msg
->buf
;
1361 mlog(0, "node %u cancels join on domain %s\n", cancel
->node_idx
,
1364 spin_lock(&dlm_domain_lock
);
1365 dlm
= __dlm_lookup_domain_full(cancel
->domain
, cancel
->name_len
);
1368 spin_lock(&dlm
->spinlock
);
1370 /* Yikes, this guy wants to cancel his join. No
1371 * problem, we simply cleanup our join state. */
1372 BUG_ON(dlm
->joining_node
!= cancel
->node_idx
);
1373 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
1375 spin_unlock(&dlm
->spinlock
);
1377 spin_unlock(&dlm_domain_lock
);
1382 static int dlm_send_one_join_cancel(struct dlm_ctxt
*dlm
,
1386 struct dlm_cancel_join cancel_msg
;
1388 memset(&cancel_msg
, 0, sizeof(cancel_msg
));
1389 cancel_msg
.node_idx
= dlm
->node_num
;
1390 cancel_msg
.name_len
= strlen(dlm
->name
);
1391 memcpy(cancel_msg
.domain
, dlm
->name
, cancel_msg
.name_len
);
1393 status
= o2net_send_message(DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
1394 &cancel_msg
, sizeof(cancel_msg
), node
,
1397 mlog(ML_ERROR
, "Error %d when sending message %u (key 0x%x) to "
1398 "node %u\n", status
, DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
1407 /* map_size should be in bytes. */
1408 static int dlm_send_join_cancels(struct dlm_ctxt
*dlm
,
1409 unsigned long *node_map
,
1410 unsigned int map_size
)
1412 int status
, tmpstat
;
1415 if (map_size
!= (BITS_TO_LONGS(O2NM_MAX_NODES
) *
1416 sizeof(unsigned long))) {
1418 "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
1419 map_size
, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES
));
1425 while ((node
= find_next_bit(node_map
, O2NM_MAX_NODES
,
1426 node
+ 1)) < O2NM_MAX_NODES
) {
1427 if (node
== dlm
->node_num
)
1430 tmpstat
= dlm_send_one_join_cancel(dlm
, node
);
1432 mlog(ML_ERROR
, "Error return %d cancelling join on "
1433 "node %d\n", tmpstat
, node
);
1444 static int dlm_request_join(struct dlm_ctxt
*dlm
,
1446 enum dlm_query_join_response_code
*response
)
1449 struct dlm_query_join_request join_msg
;
1450 struct dlm_query_join_packet packet
;
1453 mlog(0, "querying node %d\n", node
);
1455 memset(&join_msg
, 0, sizeof(join_msg
));
1456 join_msg
.node_idx
= dlm
->node_num
;
1457 join_msg
.name_len
= strlen(dlm
->name
);
1458 memcpy(join_msg
.domain
, dlm
->name
, join_msg
.name_len
);
1459 join_msg
.dlm_proto
= dlm
->dlm_locking_proto
;
1460 join_msg
.fs_proto
= dlm
->fs_locking_proto
;
1462 /* copy live node map to join message */
1463 byte_copymap(join_msg
.node_map
, dlm
->live_nodes_map
, O2NM_MAX_NODES
);
1465 status
= o2net_send_message(DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
, &join_msg
,
1466 sizeof(join_msg
), node
, &join_resp
);
1467 if (status
< 0 && status
!= -ENOPROTOOPT
) {
1468 mlog(ML_ERROR
, "Error %d when sending message %u (key 0x%x) to "
1469 "node %u\n", status
, DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
,
1473 dlm_query_join_wire_to_packet(join_resp
, &packet
);
1475 /* -ENOPROTOOPT from the net code means the other side isn't
1476 listening for our message type -- that's fine, it means
1477 his dlm isn't up, so we can consider him a 'yes' but not
1478 joined into the domain. */
1479 if (status
== -ENOPROTOOPT
) {
1481 *response
= JOIN_OK_NO_MAP
;
1482 } else if (packet
.code
== JOIN_DISALLOW
||
1483 packet
.code
== JOIN_OK_NO_MAP
) {
1484 *response
= packet
.code
;
1485 } else if (packet
.code
== JOIN_PROTOCOL_MISMATCH
) {
1487 "This node requested DLM locking protocol %u.%u and "
1488 "filesystem locking protocol %u.%u. At least one of "
1489 "the protocol versions on node %d is not compatible, "
1491 dlm
->dlm_locking_proto
.pv_major
,
1492 dlm
->dlm_locking_proto
.pv_minor
,
1493 dlm
->fs_locking_proto
.pv_major
,
1494 dlm
->fs_locking_proto
.pv_minor
,
1497 *response
= packet
.code
;
1498 } else if (packet
.code
== JOIN_OK
) {
1499 *response
= packet
.code
;
1500 /* Use the same locking protocol as the remote node */
1501 dlm
->dlm_locking_proto
.pv_minor
= packet
.dlm_minor
;
1502 dlm
->fs_locking_proto
.pv_minor
= packet
.fs_minor
;
1504 "Node %d responds JOIN_OK with DLM locking protocol "
1505 "%u.%u and fs locking protocol %u.%u\n",
1507 dlm
->dlm_locking_proto
.pv_major
,
1508 dlm
->dlm_locking_proto
.pv_minor
,
1509 dlm
->fs_locking_proto
.pv_major
,
1510 dlm
->fs_locking_proto
.pv_minor
);
1513 mlog(ML_ERROR
, "invalid response %d from node %u\n",
1517 mlog(0, "status %d, node %d response is %d\n", status
, node
,
1524 static int dlm_send_one_join_assert(struct dlm_ctxt
*dlm
,
1529 struct dlm_assert_joined assert_msg
;
1531 mlog(0, "Sending join assert to node %u\n", node
);
1533 memset(&assert_msg
, 0, sizeof(assert_msg
));
1534 assert_msg
.node_idx
= dlm
->node_num
;
1535 assert_msg
.name_len
= strlen(dlm
->name
);
1536 memcpy(assert_msg
.domain
, dlm
->name
, assert_msg
.name_len
);
1538 status
= o2net_send_message(DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
1539 &assert_msg
, sizeof(assert_msg
), node
,
1542 mlog(ML_ERROR
, "Error %d when sending message %u (key 0x%x) to "
1543 "node %u\n", status
, DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
1551 static void dlm_send_join_asserts(struct dlm_ctxt
*dlm
,
1552 unsigned long *node_map
)
1554 int status
, node
, live
;
1558 while ((node
= find_next_bit(node_map
, O2NM_MAX_NODES
,
1559 node
+ 1)) < O2NM_MAX_NODES
) {
1560 if (node
== dlm
->node_num
)
1564 /* It is very important that this message be
1565 * received so we spin until either the node
1566 * has died or it gets the message. */
1567 status
= dlm_send_one_join_assert(dlm
, node
);
1569 spin_lock(&dlm
->spinlock
);
1570 live
= test_bit(node
, dlm
->live_nodes_map
);
1571 spin_unlock(&dlm
->spinlock
);
1574 mlog(ML_ERROR
, "Error return %d asserting "
1575 "join on node %d\n", status
, node
);
1577 /* give us some time between errors... */
1579 msleep(DLM_DOMAIN_BACKOFF_MS
);
1581 } while (status
&& live
);
1585 struct domain_join_ctxt
{
1586 unsigned long live_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1587 unsigned long yes_resp_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1590 static int dlm_should_restart_join(struct dlm_ctxt
*dlm
,
1591 struct domain_join_ctxt
*ctxt
,
1592 enum dlm_query_join_response_code response
)
1596 if (response
== JOIN_DISALLOW
) {
1597 mlog(0, "Latest response of disallow -- should restart\n");
1601 spin_lock(&dlm
->spinlock
);
1602 /* For now, we restart the process if the node maps have
1604 ret
= memcmp(ctxt
->live_map
, dlm
->live_nodes_map
,
1605 sizeof(dlm
->live_nodes_map
));
1606 spin_unlock(&dlm
->spinlock
);
1609 mlog(0, "Node maps changed -- should restart\n");
1614 static int dlm_try_to_join_domain(struct dlm_ctxt
*dlm
)
1616 int status
= 0, tmpstat
, node
;
1617 struct domain_join_ctxt
*ctxt
;
1618 enum dlm_query_join_response_code response
= JOIN_DISALLOW
;
1622 ctxt
= kzalloc(sizeof(*ctxt
), GFP_KERNEL
);
1629 /* group sem locking should work for us here -- we're already
1630 * registered for heartbeat events so filling this should be
1631 * atomic wrt getting those handlers called. */
1632 o2hb_fill_node_map(dlm
->live_nodes_map
, sizeof(dlm
->live_nodes_map
));
1634 spin_lock(&dlm
->spinlock
);
1635 memcpy(ctxt
->live_map
, dlm
->live_nodes_map
, sizeof(ctxt
->live_map
));
1637 __dlm_set_joining_node(dlm
, dlm
->node_num
);
1639 spin_unlock(&dlm
->spinlock
);
1642 while ((node
= find_next_bit(ctxt
->live_map
, O2NM_MAX_NODES
,
1643 node
+ 1)) < O2NM_MAX_NODES
) {
1644 if (node
== dlm
->node_num
)
1647 status
= dlm_request_join(dlm
, node
, &response
);
1653 /* Ok, either we got a response or the node doesn't have a
1655 if (response
== JOIN_OK
)
1656 set_bit(node
, ctxt
->yes_resp_map
);
1658 if (dlm_should_restart_join(dlm
, ctxt
, response
)) {
1664 mlog(0, "Yay, done querying nodes!\n");
1666 /* Yay, everyone agree's we can join the domain. My domain is
1667 * comprised of all nodes who were put in the
1668 * yes_resp_map. Copy that into our domain map and send a join
1669 * assert message to clean up everyone elses state. */
1670 spin_lock(&dlm
->spinlock
);
1671 memcpy(dlm
->domain_map
, ctxt
->yes_resp_map
,
1672 sizeof(ctxt
->yes_resp_map
));
1673 set_bit(dlm
->node_num
, dlm
->domain_map
);
1674 spin_unlock(&dlm
->spinlock
);
1676 /* Support for global heartbeat and node info was added in 1.1 */
1677 if (dlm
->dlm_locking_proto
.pv_major
> 1 ||
1678 dlm
->dlm_locking_proto
.pv_minor
> 0) {
1679 status
= dlm_send_nodeinfo(dlm
, ctxt
->yes_resp_map
);
1684 status
= dlm_send_regions(dlm
, ctxt
->yes_resp_map
);
1691 dlm_send_join_asserts(dlm
, ctxt
->yes_resp_map
);
1693 /* Joined state *must* be set before the joining node
1694 * information, otherwise the query_join handler may read no
1695 * current joiner but a state of NEW and tell joining nodes
1696 * we're not in the domain. */
1697 spin_lock(&dlm_domain_lock
);
1698 dlm
->dlm_state
= DLM_CTXT_JOINED
;
1700 spin_unlock(&dlm_domain_lock
);
1703 spin_lock(&dlm
->spinlock
);
1704 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
1706 printk(KERN_NOTICE
"o2dlm: Joining domain %s ", dlm
->name
);
1707 __dlm_print_nodes(dlm
);
1709 spin_unlock(&dlm
->spinlock
);
1712 /* Do we need to send a cancel message to any nodes? */
1714 tmpstat
= dlm_send_join_cancels(dlm
,
1716 sizeof(ctxt
->yes_resp_map
));
1718 mlog_errno(tmpstat
);
1723 mlog(0, "returning %d\n", status
);
1727 static void dlm_unregister_domain_handlers(struct dlm_ctxt
*dlm
)
1729 o2hb_unregister_callback(dlm
->name
, &dlm
->dlm_hb_up
);
1730 o2hb_unregister_callback(dlm
->name
, &dlm
->dlm_hb_down
);
1731 o2net_unregister_handler_list(&dlm
->dlm_domain_handlers
);
1734 static int dlm_register_domain_handlers(struct dlm_ctxt
*dlm
)
1738 mlog(0, "registering handlers.\n");
1740 o2hb_setup_callback(&dlm
->dlm_hb_down
, O2HB_NODE_DOWN_CB
,
1741 dlm_hb_node_down_cb
, dlm
, DLM_HB_NODE_DOWN_PRI
);
1742 status
= o2hb_register_callback(dlm
->name
, &dlm
->dlm_hb_down
);
1746 o2hb_setup_callback(&dlm
->dlm_hb_up
, O2HB_NODE_UP_CB
,
1747 dlm_hb_node_up_cb
, dlm
, DLM_HB_NODE_UP_PRI
);
1748 status
= o2hb_register_callback(dlm
->name
, &dlm
->dlm_hb_up
);
1752 status
= o2net_register_handler(DLM_MASTER_REQUEST_MSG
, dlm
->key
,
1753 sizeof(struct dlm_master_request
),
1754 dlm_master_request_handler
,
1755 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1759 status
= o2net_register_handler(DLM_ASSERT_MASTER_MSG
, dlm
->key
,
1760 sizeof(struct dlm_assert_master
),
1761 dlm_assert_master_handler
,
1762 dlm
, dlm_assert_master_post_handler
,
1763 &dlm
->dlm_domain_handlers
);
1767 status
= o2net_register_handler(DLM_CREATE_LOCK_MSG
, dlm
->key
,
1768 sizeof(struct dlm_create_lock
),
1769 dlm_create_lock_handler
,
1770 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1774 status
= o2net_register_handler(DLM_CONVERT_LOCK_MSG
, dlm
->key
,
1775 DLM_CONVERT_LOCK_MAX_LEN
,
1776 dlm_convert_lock_handler
,
1777 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1781 status
= o2net_register_handler(DLM_UNLOCK_LOCK_MSG
, dlm
->key
,
1782 DLM_UNLOCK_LOCK_MAX_LEN
,
1783 dlm_unlock_lock_handler
,
1784 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1788 status
= o2net_register_handler(DLM_PROXY_AST_MSG
, dlm
->key
,
1789 DLM_PROXY_AST_MAX_LEN
,
1790 dlm_proxy_ast_handler
,
1791 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1795 status
= o2net_register_handler(DLM_EXIT_DOMAIN_MSG
, dlm
->key
,
1796 sizeof(struct dlm_exit_domain
),
1797 dlm_exit_domain_handler
,
1798 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1802 status
= o2net_register_handler(DLM_DEREF_LOCKRES_MSG
, dlm
->key
,
1803 sizeof(struct dlm_deref_lockres
),
1804 dlm_deref_lockres_handler
,
1805 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1809 status
= o2net_register_handler(DLM_MIGRATE_REQUEST_MSG
, dlm
->key
,
1810 sizeof(struct dlm_migrate_request
),
1811 dlm_migrate_request_handler
,
1812 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1816 status
= o2net_register_handler(DLM_MIG_LOCKRES_MSG
, dlm
->key
,
1817 DLM_MIG_LOCKRES_MAX_LEN
,
1818 dlm_mig_lockres_handler
,
1819 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1823 status
= o2net_register_handler(DLM_MASTER_REQUERY_MSG
, dlm
->key
,
1824 sizeof(struct dlm_master_requery
),
1825 dlm_master_requery_handler
,
1826 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1830 status
= o2net_register_handler(DLM_LOCK_REQUEST_MSG
, dlm
->key
,
1831 sizeof(struct dlm_lock_request
),
1832 dlm_request_all_locks_handler
,
1833 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1837 status
= o2net_register_handler(DLM_RECO_DATA_DONE_MSG
, dlm
->key
,
1838 sizeof(struct dlm_reco_data_done
),
1839 dlm_reco_data_done_handler
,
1840 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1844 status
= o2net_register_handler(DLM_BEGIN_RECO_MSG
, dlm
->key
,
1845 sizeof(struct dlm_begin_reco
),
1846 dlm_begin_reco_handler
,
1847 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1851 status
= o2net_register_handler(DLM_FINALIZE_RECO_MSG
, dlm
->key
,
1852 sizeof(struct dlm_finalize_reco
),
1853 dlm_finalize_reco_handler
,
1854 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1858 status
= o2net_register_handler(DLM_BEGIN_EXIT_DOMAIN_MSG
, dlm
->key
,
1859 sizeof(struct dlm_exit_domain
),
1860 dlm_begin_exit_domain_handler
,
1861 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1867 dlm_unregister_domain_handlers(dlm
);
1872 static int dlm_join_domain(struct dlm_ctxt
*dlm
)
1875 unsigned int backoff
;
1876 unsigned int total_backoff
= 0;
1880 mlog(0, "Join domain %s\n", dlm
->name
);
1882 status
= dlm_register_domain_handlers(dlm
);
1888 status
= dlm_launch_thread(dlm
);
1894 status
= dlm_launch_recovery_thread(dlm
);
1900 status
= dlm_debug_init(dlm
);
1906 dlm
->dlm_worker
= create_singlethread_workqueue("dlm_wq");
1907 if (!dlm
->dlm_worker
) {
1914 status
= dlm_try_to_join_domain(dlm
);
1916 /* If we're racing another node to the join, then we
1917 * need to back off temporarily and let them
1919 #define DLM_JOIN_TIMEOUT_MSECS 90000
1920 if (status
== -EAGAIN
) {
1921 if (signal_pending(current
)) {
1922 status
= -ERESTARTSYS
;
1927 msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS
)) {
1928 status
= -ERESTARTSYS
;
1929 mlog(ML_NOTICE
, "Timed out joining dlm domain "
1930 "%s after %u msecs\n", dlm
->name
,
1931 jiffies_to_msecs(total_backoff
));
1937 * <dale> No, after you!
1939 * <dale> But you first!
1942 backoff
= (unsigned int)(jiffies
& 0x3);
1943 backoff
*= DLM_DOMAIN_BACKOFF_MS
;
1944 total_backoff
+= backoff
;
1945 mlog(0, "backoff %d\n", backoff
);
1948 } while (status
== -EAGAIN
);
1957 wake_up(&dlm_domain_events
);
1960 dlm_unregister_domain_handlers(dlm
);
1961 dlm_debug_shutdown(dlm
);
1962 dlm_complete_thread(dlm
);
1963 dlm_complete_recovery_thread(dlm
);
1964 dlm_destroy_dlm_worker(dlm
);
1970 static struct dlm_ctxt
*dlm_alloc_ctxt(const char *domain
,
1975 struct dlm_ctxt
*dlm
= NULL
;
1977 dlm
= kzalloc(sizeof(*dlm
), GFP_KERNEL
);
1979 mlog_errno(-ENOMEM
);
1983 dlm
->name
= kstrdup(domain
, GFP_KERNEL
);
1984 if (dlm
->name
== NULL
) {
1985 mlog_errno(-ENOMEM
);
1991 dlm
->lockres_hash
= (struct hlist_head
**)dlm_alloc_pagevec(DLM_HASH_PAGES
);
1992 if (!dlm
->lockres_hash
) {
1993 mlog_errno(-ENOMEM
);
2000 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++)
2001 INIT_HLIST_HEAD(dlm_lockres_hash(dlm
, i
));
2003 dlm
->master_hash
= (struct hlist_head
**)
2004 dlm_alloc_pagevec(DLM_HASH_PAGES
);
2005 if (!dlm
->master_hash
) {
2006 mlog_errno(-ENOMEM
);
2007 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
2014 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++)
2015 INIT_HLIST_HEAD(dlm_master_hash(dlm
, i
));
2018 dlm
->node_num
= o2nm_this_node();
2020 ret
= dlm_create_debugfs_subroot(dlm
);
2022 dlm_free_pagevec((void **)dlm
->master_hash
, DLM_HASH_PAGES
);
2023 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
2030 spin_lock_init(&dlm
->spinlock
);
2031 spin_lock_init(&dlm
->master_lock
);
2032 spin_lock_init(&dlm
->ast_lock
);
2033 spin_lock_init(&dlm
->track_lock
);
2034 INIT_LIST_HEAD(&dlm
->list
);
2035 INIT_LIST_HEAD(&dlm
->dirty_list
);
2036 INIT_LIST_HEAD(&dlm
->reco
.resources
);
2037 INIT_LIST_HEAD(&dlm
->reco
.node_data
);
2038 INIT_LIST_HEAD(&dlm
->purge_list
);
2039 INIT_LIST_HEAD(&dlm
->dlm_domain_handlers
);
2040 INIT_LIST_HEAD(&dlm
->tracking_list
);
2041 dlm
->reco
.state
= 0;
2043 INIT_LIST_HEAD(&dlm
->pending_asts
);
2044 INIT_LIST_HEAD(&dlm
->pending_basts
);
2046 mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
2047 dlm
->recovery_map
, &(dlm
->recovery_map
[0]));
2049 memset(dlm
->recovery_map
, 0, sizeof(dlm
->recovery_map
));
2050 memset(dlm
->live_nodes_map
, 0, sizeof(dlm
->live_nodes_map
));
2051 memset(dlm
->domain_map
, 0, sizeof(dlm
->domain_map
));
2053 dlm
->dlm_thread_task
= NULL
;
2054 dlm
->dlm_reco_thread_task
= NULL
;
2055 dlm
->dlm_worker
= NULL
;
2056 init_waitqueue_head(&dlm
->dlm_thread_wq
);
2057 init_waitqueue_head(&dlm
->dlm_reco_thread_wq
);
2058 init_waitqueue_head(&dlm
->reco
.event
);
2059 init_waitqueue_head(&dlm
->ast_wq
);
2060 init_waitqueue_head(&dlm
->migration_wq
);
2061 INIT_LIST_HEAD(&dlm
->mle_hb_events
);
2063 dlm
->joining_node
= DLM_LOCK_RES_OWNER_UNKNOWN
;
2064 init_waitqueue_head(&dlm
->dlm_join_events
);
2066 dlm
->reco
.new_master
= O2NM_INVALID_NODE_NUM
;
2067 dlm
->reco
.dead_node
= O2NM_INVALID_NODE_NUM
;
2069 atomic_set(&dlm
->res_tot_count
, 0);
2070 atomic_set(&dlm
->res_cur_count
, 0);
2071 for (i
= 0; i
< DLM_MLE_NUM_TYPES
; ++i
) {
2072 atomic_set(&dlm
->mle_tot_count
[i
], 0);
2073 atomic_set(&dlm
->mle_cur_count
[i
], 0);
2076 spin_lock_init(&dlm
->work_lock
);
2077 INIT_LIST_HEAD(&dlm
->work_list
);
2078 INIT_WORK(&dlm
->dispatched_work
, dlm_dispatch_work
);
2080 kref_init(&dlm
->dlm_refs
);
2081 dlm
->dlm_state
= DLM_CTXT_NEW
;
2083 INIT_LIST_HEAD(&dlm
->dlm_eviction_callbacks
);
2085 mlog(0, "context init: refcount %u\n",
2086 atomic_read(&dlm
->dlm_refs
.refcount
));
2093 * Compare a requested locking protocol version against the current one.
2095 * If the major numbers are different, they are incompatible.
2096 * If the current minor is greater than the request, they are incompatible.
2097 * If the current minor is less than or equal to the request, they are
2098 * compatible, and the requester should run at the current minor version.
2100 static int dlm_protocol_compare(struct dlm_protocol_version
*existing
,
2101 struct dlm_protocol_version
*request
)
2103 if (existing
->pv_major
!= request
->pv_major
)
2106 if (existing
->pv_minor
> request
->pv_minor
)
2109 if (existing
->pv_minor
< request
->pv_minor
)
2110 request
->pv_minor
= existing
->pv_minor
;
2116 * dlm_register_domain: one-time setup per "domain".
2118 * The filesystem passes in the requested locking version via proto.
2119 * If registration was successful, proto will contain the negotiated
2122 struct dlm_ctxt
* dlm_register_domain(const char *domain
,
2124 struct dlm_protocol_version
*fs_proto
)
2127 struct dlm_ctxt
*dlm
= NULL
;
2128 struct dlm_ctxt
*new_ctxt
= NULL
;
2130 if (strlen(domain
) >= O2NM_MAX_NAME_LEN
) {
2131 ret
= -ENAMETOOLONG
;
2132 mlog(ML_ERROR
, "domain name length too long\n");
2136 mlog(0, "register called for domain \"%s\"\n", domain
);
2140 if (signal_pending(current
)) {
2146 spin_lock(&dlm_domain_lock
);
2148 dlm
= __dlm_lookup_domain(domain
);
2150 if (dlm
->dlm_state
!= DLM_CTXT_JOINED
) {
2151 spin_unlock(&dlm_domain_lock
);
2153 mlog(0, "This ctxt is not joined yet!\n");
2154 wait_event_interruptible(dlm_domain_events
,
2155 dlm_wait_on_domain_helper(
2160 if (dlm_protocol_compare(&dlm
->fs_locking_proto
, fs_proto
)) {
2161 spin_unlock(&dlm_domain_lock
);
2163 "Requested locking protocol version is not "
2164 "compatible with already registered domain "
2165 "\"%s\"\n", domain
);
2173 spin_unlock(&dlm_domain_lock
);
2181 spin_unlock(&dlm_domain_lock
);
2183 new_ctxt
= dlm_alloc_ctxt(domain
, key
);
2192 /* a little variable switch-a-roo here... */
2196 /* add the new domain */
2197 list_add_tail(&dlm
->list
, &dlm_domains
);
2198 spin_unlock(&dlm_domain_lock
);
2201 * Pass the locking protocol version into the join. If the join
2202 * succeeds, it will have the negotiated protocol set.
2204 dlm
->dlm_locking_proto
= dlm_protocol
;
2205 dlm
->fs_locking_proto
= *fs_proto
;
2207 ret
= dlm_join_domain(dlm
);
2214 /* Tell the caller what locking protocol we negotiated */
2215 *fs_proto
= dlm
->fs_locking_proto
;
2220 dlm_free_ctxt_mem(new_ctxt
);
2227 EXPORT_SYMBOL_GPL(dlm_register_domain
);
2229 static LIST_HEAD(dlm_join_handlers
);
2231 static void dlm_unregister_net_handlers(void)
2233 o2net_unregister_handler_list(&dlm_join_handlers
);
2236 static int dlm_register_net_handlers(void)
2240 status
= o2net_register_handler(DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
,
2241 sizeof(struct dlm_query_join_request
),
2242 dlm_query_join_handler
,
2243 NULL
, NULL
, &dlm_join_handlers
);
2247 status
= o2net_register_handler(DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
2248 sizeof(struct dlm_assert_joined
),
2249 dlm_assert_joined_handler
,
2250 NULL
, NULL
, &dlm_join_handlers
);
2254 status
= o2net_register_handler(DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
2255 sizeof(struct dlm_cancel_join
),
2256 dlm_cancel_join_handler
,
2257 NULL
, NULL
, &dlm_join_handlers
);
2261 status
= o2net_register_handler(DLM_QUERY_REGION
, DLM_MOD_KEY
,
2262 sizeof(struct dlm_query_region
),
2263 dlm_query_region_handler
,
2264 NULL
, NULL
, &dlm_join_handlers
);
2269 status
= o2net_register_handler(DLM_QUERY_NODEINFO
, DLM_MOD_KEY
,
2270 sizeof(struct dlm_query_nodeinfo
),
2271 dlm_query_nodeinfo_handler
,
2272 NULL
, NULL
, &dlm_join_handlers
);
2275 dlm_unregister_net_handlers();
2280 /* Domain eviction callback handling.
2282 * The file system requires notification of node death *before* the
2283 * dlm completes it's recovery work, otherwise it may be able to
2284 * acquire locks on resources requiring recovery. Since the dlm can
2285 * evict a node from it's domain *before* heartbeat fires, a similar
2286 * mechanism is required. */
2288 /* Eviction is not expected to happen often, so a per-domain lock is
2289 * not necessary. Eviction callbacks are allowed to sleep for short
2290 * periods of time. */
2291 static DECLARE_RWSEM(dlm_callback_sem
);
2293 void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt
*dlm
,
2296 struct dlm_eviction_cb
*cb
;
2298 down_read(&dlm_callback_sem
);
2299 list_for_each_entry(cb
, &dlm
->dlm_eviction_callbacks
, ec_item
) {
2300 cb
->ec_func(node_num
, cb
->ec_data
);
2302 up_read(&dlm_callback_sem
);
2305 void dlm_setup_eviction_cb(struct dlm_eviction_cb
*cb
,
2306 dlm_eviction_func
*f
,
2309 INIT_LIST_HEAD(&cb
->ec_item
);
2313 EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb
);
2315 void dlm_register_eviction_cb(struct dlm_ctxt
*dlm
,
2316 struct dlm_eviction_cb
*cb
)
2318 down_write(&dlm_callback_sem
);
2319 list_add_tail(&cb
->ec_item
, &dlm
->dlm_eviction_callbacks
);
2320 up_write(&dlm_callback_sem
);
2322 EXPORT_SYMBOL_GPL(dlm_register_eviction_cb
);
2324 void dlm_unregister_eviction_cb(struct dlm_eviction_cb
*cb
)
2326 down_write(&dlm_callback_sem
);
2327 list_del_init(&cb
->ec_item
);
2328 up_write(&dlm_callback_sem
);
2330 EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb
);
2332 static int __init
dlm_init(void)
2336 status
= dlm_init_mle_cache();
2338 mlog(ML_ERROR
, "Could not create o2dlm_mle slabcache\n");
2342 status
= dlm_init_master_caches();
2344 mlog(ML_ERROR
, "Could not create o2dlm_lockres and "
2345 "o2dlm_lockname slabcaches\n");
2349 status
= dlm_init_lock_cache();
2351 mlog(ML_ERROR
, "Count not create o2dlm_lock slabcache\n");
2355 status
= dlm_register_net_handlers();
2357 mlog(ML_ERROR
, "Unable to register network handlers\n");
2361 status
= dlm_create_debugfs_root();
2367 dlm_unregister_net_handlers();
2368 dlm_destroy_lock_cache();
2369 dlm_destroy_master_caches();
2370 dlm_destroy_mle_cache();
2374 static void __exit
dlm_exit (void)
2376 dlm_destroy_debugfs_root();
2377 dlm_unregister_net_handlers();
2378 dlm_destroy_lock_cache();
2379 dlm_destroy_master_caches();
2380 dlm_destroy_mle_cache();
2383 MODULE_AUTHOR("Oracle");
2384 MODULE_LICENSE("GPL");
2385 MODULE_DESCRIPTION("OCFS2 Distributed Lock Management");
2387 module_init(dlm_init
);
2388 module_exit(dlm_exit
);