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"
48 #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
49 #include "cluster/masklog.h"
51 static inline void byte_set_bit(u8 nr
, u8 map
[])
53 map
[nr
>> 3] |= (1UL << (nr
& 7));
56 static inline int byte_test_bit(u8 nr
, u8 map
[])
58 return ((1UL << (nr
& 7)) & (map
[nr
>> 3])) != 0;
61 static inline void byte_copymap(u8 dmap
[], unsigned long smap
[],
69 memset(dmap
, 0, ((sz
+ 7) >> 3));
70 for (nn
= 0 ; nn
< sz
; nn
++)
71 if (test_bit(nn
, smap
))
72 byte_set_bit(nn
, dmap
);
75 static void dlm_free_pagevec(void **vec
, int pages
)
78 free_page((unsigned long)vec
[pages
]);
82 static void **dlm_alloc_pagevec(int pages
)
84 void **vec
= kmalloc(pages
* sizeof(void *), GFP_KERNEL
);
90 for (i
= 0; i
< pages
; i
++)
91 if (!(vec
[i
] = (void *)__get_free_page(GFP_KERNEL
)))
94 mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
95 pages
, (unsigned long)DLM_HASH_PAGES
,
96 (unsigned long)DLM_BUCKETS_PER_PAGE
);
99 dlm_free_pagevec(vec
, i
);
105 * spinlock lock ordering: if multiple locks are needed, obey this ordering:
107 * struct dlm_ctxt->spinlock
108 * struct dlm_lock_resource->spinlock
109 * struct dlm_ctxt->master_lock
110 * struct dlm_ctxt->ast_lock
111 * dlm_master_list_entry->spinlock
116 DEFINE_SPINLOCK(dlm_domain_lock
);
117 LIST_HEAD(dlm_domains
);
118 static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events
);
121 * The supported protocol version for DLM communication. Running domains
122 * will have a negotiated version with the same major number and a minor
123 * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
124 * be used to determine what a running domain is actually using.
126 static const struct dlm_protocol_version dlm_protocol
= {
131 #define DLM_DOMAIN_BACKOFF_MS 200
133 static int dlm_query_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
135 static int dlm_assert_joined_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
137 static int dlm_cancel_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
139 static int dlm_exit_domain_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
141 static int dlm_protocol_compare(struct dlm_protocol_version
*existing
,
142 struct dlm_protocol_version
*request
);
144 static void dlm_unregister_domain_handlers(struct dlm_ctxt
*dlm
);
146 void __dlm_unhash_lockres(struct dlm_lock_resource
*lockres
)
148 if (!hlist_unhashed(&lockres
->hash_node
)) {
149 hlist_del_init(&lockres
->hash_node
);
150 dlm_lockres_put(lockres
);
154 void __dlm_insert_lockres(struct dlm_ctxt
*dlm
,
155 struct dlm_lock_resource
*res
)
157 struct hlist_head
*bucket
;
160 assert_spin_locked(&dlm
->spinlock
);
163 bucket
= dlm_lockres_hash(dlm
, q
->hash
);
165 /* get a reference for our hashtable */
166 dlm_lockres_get(res
);
168 hlist_add_head(&res
->hash_node
, bucket
);
171 struct dlm_lock_resource
* __dlm_lookup_lockres_full(struct dlm_ctxt
*dlm
,
176 struct hlist_head
*bucket
;
177 struct hlist_node
*list
;
179 mlog_entry("%.*s\n", len
, name
);
181 assert_spin_locked(&dlm
->spinlock
);
183 bucket
= dlm_lockres_hash(dlm
, hash
);
185 hlist_for_each(list
, bucket
) {
186 struct dlm_lock_resource
*res
= hlist_entry(list
,
187 struct dlm_lock_resource
, hash_node
);
188 if (res
->lockname
.name
[0] != name
[0])
190 if (unlikely(res
->lockname
.len
!= len
))
192 if (memcmp(res
->lockname
.name
+ 1, name
+ 1, len
- 1))
194 dlm_lockres_get(res
);
200 /* intended to be called by functions which do not care about lock
201 * resources which are being purged (most net _handler functions).
202 * this will return NULL for any lock resource which is found but
203 * currently in the process of dropping its mastery reference.
204 * use __dlm_lookup_lockres_full when you need the lock resource
205 * regardless (e.g. dlm_get_lock_resource) */
206 struct dlm_lock_resource
* __dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
211 struct dlm_lock_resource
*res
= NULL
;
213 mlog_entry("%.*s\n", len
, name
);
215 assert_spin_locked(&dlm
->spinlock
);
217 res
= __dlm_lookup_lockres_full(dlm
, name
, len
, hash
);
219 spin_lock(&res
->spinlock
);
220 if (res
->state
& DLM_LOCK_RES_DROPPING_REF
) {
221 spin_unlock(&res
->spinlock
);
222 dlm_lockres_put(res
);
225 spin_unlock(&res
->spinlock
);
231 struct dlm_lock_resource
* dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
235 struct dlm_lock_resource
*res
;
236 unsigned int hash
= dlm_lockid_hash(name
, len
);
238 spin_lock(&dlm
->spinlock
);
239 res
= __dlm_lookup_lockres(dlm
, name
, len
, hash
);
240 spin_unlock(&dlm
->spinlock
);
244 static struct dlm_ctxt
* __dlm_lookup_domain_full(const char *domain
, int len
)
246 struct dlm_ctxt
*tmp
= NULL
;
247 struct list_head
*iter
;
249 assert_spin_locked(&dlm_domain_lock
);
251 /* tmp->name here is always NULL terminated,
252 * but domain may not be! */
253 list_for_each(iter
, &dlm_domains
) {
254 tmp
= list_entry (iter
, struct dlm_ctxt
, list
);
255 if (strlen(tmp
->name
) == len
&&
256 memcmp(tmp
->name
, domain
, len
)==0)
264 /* For null terminated domain strings ONLY */
265 static struct dlm_ctxt
* __dlm_lookup_domain(const char *domain
)
267 assert_spin_locked(&dlm_domain_lock
);
269 return __dlm_lookup_domain_full(domain
, strlen(domain
));
273 /* returns true on one of two conditions:
274 * 1) the domain does not exist
275 * 2) the domain exists and it's state is "joined" */
276 static int dlm_wait_on_domain_helper(const char *domain
)
279 struct dlm_ctxt
*tmp
= NULL
;
281 spin_lock(&dlm_domain_lock
);
283 tmp
= __dlm_lookup_domain(domain
);
286 else if (tmp
->dlm_state
== DLM_CTXT_JOINED
)
289 spin_unlock(&dlm_domain_lock
);
293 static void dlm_free_ctxt_mem(struct dlm_ctxt
*dlm
)
295 dlm_destroy_debugfs_subroot(dlm
);
297 if (dlm
->lockres_hash
)
298 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
300 if (dlm
->master_hash
)
301 dlm_free_pagevec((void **)dlm
->master_hash
, DLM_HASH_PAGES
);
309 /* A little strange - this function will be called while holding
310 * dlm_domain_lock and is expected to be holding it on the way out. We
311 * will however drop and reacquire it multiple times */
312 static void dlm_ctxt_release(struct kref
*kref
)
314 struct dlm_ctxt
*dlm
;
316 dlm
= container_of(kref
, struct dlm_ctxt
, dlm_refs
);
318 BUG_ON(dlm
->num_joins
);
319 BUG_ON(dlm
->dlm_state
== DLM_CTXT_JOINED
);
321 /* we may still be in the list if we hit an error during join. */
322 list_del_init(&dlm
->list
);
324 spin_unlock(&dlm_domain_lock
);
326 mlog(0, "freeing memory from domain %s\n", dlm
->name
);
328 wake_up(&dlm_domain_events
);
330 dlm_free_ctxt_mem(dlm
);
332 spin_lock(&dlm_domain_lock
);
335 void dlm_put(struct dlm_ctxt
*dlm
)
337 spin_lock(&dlm_domain_lock
);
338 kref_put(&dlm
->dlm_refs
, dlm_ctxt_release
);
339 spin_unlock(&dlm_domain_lock
);
342 static void __dlm_get(struct dlm_ctxt
*dlm
)
344 kref_get(&dlm
->dlm_refs
);
347 /* given a questionable reference to a dlm object, gets a reference if
348 * it can find it in the list, otherwise returns NULL in which case
349 * you shouldn't trust your pointer. */
350 struct dlm_ctxt
*dlm_grab(struct dlm_ctxt
*dlm
)
352 struct list_head
*iter
;
353 struct dlm_ctxt
*target
= NULL
;
355 spin_lock(&dlm_domain_lock
);
357 list_for_each(iter
, &dlm_domains
) {
358 target
= list_entry (iter
, struct dlm_ctxt
, list
);
368 spin_unlock(&dlm_domain_lock
);
373 int dlm_domain_fully_joined(struct dlm_ctxt
*dlm
)
377 spin_lock(&dlm_domain_lock
);
378 ret
= (dlm
->dlm_state
== DLM_CTXT_JOINED
) ||
379 (dlm
->dlm_state
== DLM_CTXT_IN_SHUTDOWN
);
380 spin_unlock(&dlm_domain_lock
);
385 static void dlm_destroy_dlm_worker(struct dlm_ctxt
*dlm
)
387 if (dlm
->dlm_worker
) {
388 flush_workqueue(dlm
->dlm_worker
);
389 destroy_workqueue(dlm
->dlm_worker
);
390 dlm
->dlm_worker
= NULL
;
394 static void dlm_complete_dlm_shutdown(struct dlm_ctxt
*dlm
)
396 dlm_unregister_domain_handlers(dlm
);
397 dlm_debug_shutdown(dlm
);
398 dlm_complete_thread(dlm
);
399 dlm_complete_recovery_thread(dlm
);
400 dlm_destroy_dlm_worker(dlm
);
402 /* We've left the domain. Now we can take ourselves out of the
403 * list and allow the kref stuff to help us free the
405 spin_lock(&dlm_domain_lock
);
406 list_del_init(&dlm
->list
);
407 spin_unlock(&dlm_domain_lock
);
409 /* Wake up anyone waiting for us to remove this domain */
410 wake_up(&dlm_domain_events
);
413 static int dlm_migrate_all_locks(struct dlm_ctxt
*dlm
)
415 int i
, num
, n
, ret
= 0;
416 struct dlm_lock_resource
*res
;
417 struct hlist_node
*iter
;
418 struct hlist_head
*bucket
;
421 mlog(0, "Migrating locks from domain %s\n", dlm
->name
);
424 spin_lock(&dlm
->spinlock
);
425 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++) {
428 bucket
= dlm_lockres_hash(dlm
, i
);
429 iter
= bucket
->first
;
432 res
= hlist_entry(iter
, struct dlm_lock_resource
,
434 dlm_lockres_get(res
);
435 /* migrate, if necessary. this will drop the dlm
436 * spinlock and retake it if it does migration. */
437 dropped
= dlm_empty_lockres(dlm
, res
);
439 spin_lock(&res
->spinlock
);
440 __dlm_lockres_calc_usage(dlm
, res
);
441 iter
= res
->hash_node
.next
;
442 spin_unlock(&res
->spinlock
);
444 dlm_lockres_put(res
);
449 cond_resched_lock(&dlm
->spinlock
);
451 mlog(0, "%s: touched %d lockreses in bucket %d "
452 "(tot=%d)\n", dlm
->name
, n
, i
, num
);
454 spin_unlock(&dlm
->spinlock
);
455 wake_up(&dlm
->dlm_thread_wq
);
457 /* let the dlm thread take care of purging, keep scanning until
458 * nothing remains in the hash */
460 mlog(0, "%s: %d lock resources in hash last pass\n",
464 mlog(0, "DONE Migrating locks from domain %s\n", dlm
->name
);
468 static int dlm_no_joining_node(struct dlm_ctxt
*dlm
)
472 spin_lock(&dlm
->spinlock
);
473 ret
= dlm
->joining_node
== DLM_LOCK_RES_OWNER_UNKNOWN
;
474 spin_unlock(&dlm
->spinlock
);
479 static void dlm_mark_domain_leaving(struct dlm_ctxt
*dlm
)
481 /* Yikes, a double spinlock! I need domain_lock for the dlm
482 * state and the dlm spinlock for join state... Sorry! */
484 spin_lock(&dlm_domain_lock
);
485 spin_lock(&dlm
->spinlock
);
487 if (dlm
->joining_node
!= DLM_LOCK_RES_OWNER_UNKNOWN
) {
488 mlog(0, "Node %d is joining, we wait on it.\n",
490 spin_unlock(&dlm
->spinlock
);
491 spin_unlock(&dlm_domain_lock
);
493 wait_event(dlm
->dlm_join_events
, dlm_no_joining_node(dlm
));
497 dlm
->dlm_state
= DLM_CTXT_LEAVING
;
498 spin_unlock(&dlm
->spinlock
);
499 spin_unlock(&dlm_domain_lock
);
502 static void __dlm_print_nodes(struct dlm_ctxt
*dlm
)
506 assert_spin_locked(&dlm
->spinlock
);
508 printk(KERN_NOTICE
"o2dlm: Nodes in domain %s: ", dlm
->name
);
510 while ((node
= find_next_bit(dlm
->domain_map
, O2NM_MAX_NODES
,
511 node
+ 1)) < O2NM_MAX_NODES
) {
517 static int dlm_exit_domain_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
520 struct dlm_ctxt
*dlm
= data
;
522 struct dlm_exit_domain
*exit_msg
= (struct dlm_exit_domain
*) msg
->buf
;
524 mlog_entry("%p %u %p", msg
, len
, data
);
529 node
= exit_msg
->node_idx
;
531 printk(KERN_NOTICE
"o2dlm: Node %u leaves domain %s\n", node
, dlm
->name
);
533 spin_lock(&dlm
->spinlock
);
534 clear_bit(node
, dlm
->domain_map
);
535 __dlm_print_nodes(dlm
);
537 /* notify anything attached to the heartbeat events */
538 dlm_hb_event_notify_attached(dlm
, node
, 0);
540 spin_unlock(&dlm
->spinlock
);
547 static int dlm_send_one_domain_exit(struct dlm_ctxt
*dlm
,
551 struct dlm_exit_domain leave_msg
;
553 mlog(0, "Asking node %u if we can leave the domain %s me = %u\n",
554 node
, dlm
->name
, dlm
->node_num
);
556 memset(&leave_msg
, 0, sizeof(leave_msg
));
557 leave_msg
.node_idx
= dlm
->node_num
;
559 status
= o2net_send_message(DLM_EXIT_DOMAIN_MSG
, dlm
->key
,
560 &leave_msg
, sizeof(leave_msg
), node
,
563 mlog(ML_ERROR
, "Error %d when sending message %u (key 0x%x) to "
564 "node %u\n", status
, DLM_EXIT_DOMAIN_MSG
, dlm
->key
, node
);
565 mlog(0, "status return %d from o2net_send_message\n", status
);
571 static void dlm_leave_domain(struct dlm_ctxt
*dlm
)
573 int node
, clear_node
, status
;
575 /* At this point we've migrated away all our locks and won't
576 * accept mastership of new ones. The dlm is responsible for
577 * almost nothing now. We make sure not to confuse any joining
578 * nodes and then commence shutdown procedure. */
580 spin_lock(&dlm
->spinlock
);
581 /* Clear ourselves from the domain map */
582 clear_bit(dlm
->node_num
, dlm
->domain_map
);
583 while ((node
= find_next_bit(dlm
->domain_map
, O2NM_MAX_NODES
,
584 0)) < O2NM_MAX_NODES
) {
585 /* Drop the dlm spinlock. This is safe wrt the domain_map.
586 * -nodes cannot be added now as the
587 * query_join_handlers knows to respond with OK_NO_MAP
588 * -we catch the right network errors if a node is
589 * removed from the map while we're sending him the
591 spin_unlock(&dlm
->spinlock
);
595 status
= dlm_send_one_domain_exit(dlm
, node
);
597 status
!= -ENOPROTOOPT
&&
598 status
!= -ENOTCONN
) {
599 mlog(ML_NOTICE
, "Error %d sending domain exit message "
600 "to node %d\n", status
, node
);
602 /* Not sure what to do here but lets sleep for
603 * a bit in case this was a transient
605 msleep(DLM_DOMAIN_BACKOFF_MS
);
609 spin_lock(&dlm
->spinlock
);
610 /* If we're not clearing the node bit then we intend
611 * to loop back around to try again. */
613 clear_bit(node
, dlm
->domain_map
);
615 spin_unlock(&dlm
->spinlock
);
618 int dlm_joined(struct dlm_ctxt
*dlm
)
622 spin_lock(&dlm_domain_lock
);
624 if (dlm
->dlm_state
== DLM_CTXT_JOINED
)
627 spin_unlock(&dlm_domain_lock
);
632 int dlm_shutting_down(struct dlm_ctxt
*dlm
)
636 spin_lock(&dlm_domain_lock
);
638 if (dlm
->dlm_state
== DLM_CTXT_IN_SHUTDOWN
)
641 spin_unlock(&dlm_domain_lock
);
646 void dlm_unregister_domain(struct dlm_ctxt
*dlm
)
649 struct dlm_lock_resource
*res
;
651 spin_lock(&dlm_domain_lock
);
652 BUG_ON(dlm
->dlm_state
!= DLM_CTXT_JOINED
);
653 BUG_ON(!dlm
->num_joins
);
656 if (!dlm
->num_joins
) {
657 /* We mark it "in shutdown" now so new register
658 * requests wait until we've completely left the
659 * domain. Don't use DLM_CTXT_LEAVING yet as we still
660 * want new domain joins to communicate with us at
661 * least until we've completed migration of our
663 dlm
->dlm_state
= DLM_CTXT_IN_SHUTDOWN
;
666 spin_unlock(&dlm_domain_lock
);
669 mlog(0, "shutting down domain %s\n", dlm
->name
);
671 /* We changed dlm state, notify the thread */
672 dlm_kick_thread(dlm
, NULL
);
674 while (dlm_migrate_all_locks(dlm
)) {
675 /* Give dlm_thread time to purge the lockres' */
677 mlog(0, "%s: more migration to do\n", dlm
->name
);
680 /* This list should be empty. If not, print remaining lockres */
681 if (!list_empty(&dlm
->tracking_list
)) {
682 mlog(ML_ERROR
, "Following lockres' are still on the "
684 list_for_each_entry(res
, &dlm
->tracking_list
, tracking
)
685 dlm_print_one_lock_resource(res
);
688 dlm_mark_domain_leaving(dlm
);
689 dlm_leave_domain(dlm
);
690 dlm_force_free_mles(dlm
);
691 dlm_complete_dlm_shutdown(dlm
);
695 EXPORT_SYMBOL_GPL(dlm_unregister_domain
);
697 static int dlm_query_join_proto_check(char *proto_type
, int node
,
698 struct dlm_protocol_version
*ours
,
699 struct dlm_protocol_version
*request
)
702 struct dlm_protocol_version proto
= *request
;
704 if (!dlm_protocol_compare(ours
, &proto
)) {
706 "node %u wanted to join with %s locking protocol "
707 "%u.%u, we respond with %u.%u\n",
711 proto
.pv_major
, proto
.pv_minor
);
712 request
->pv_minor
= proto
.pv_minor
;
716 "Node %u wanted to join with %s locking "
717 "protocol %u.%u, but we have %u.%u, disallowing\n",
730 * struct dlm_query_join_packet is made up of four one-byte fields. They
731 * are effectively in big-endian order already. However, little-endian
732 * machines swap them before putting the packet on the wire (because
733 * query_join's response is a status, and that status is treated as a u32
734 * on the wire). Thus, a big-endian and little-endian machines will treat
735 * this structure differently.
737 * The solution is to have little-endian machines swap the structure when
738 * converting from the structure to the u32 representation. This will
739 * result in the structure having the correct format on the wire no matter
740 * the host endian format.
742 static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet
*packet
,
745 union dlm_query_join_response response
;
747 response
.packet
= *packet
;
748 *wire
= cpu_to_be32(response
.intval
);
751 static void dlm_query_join_wire_to_packet(u32 wire
,
752 struct dlm_query_join_packet
*packet
)
754 union dlm_query_join_response response
;
756 response
.intval
= cpu_to_be32(wire
);
757 *packet
= response
.packet
;
760 static int dlm_query_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
763 struct dlm_query_join_request
*query
;
764 struct dlm_query_join_packet packet
= {
765 .code
= JOIN_DISALLOW
,
767 struct dlm_ctxt
*dlm
= NULL
;
771 query
= (struct dlm_query_join_request
*) msg
->buf
;
773 mlog(0, "node %u wants to join domain %s\n", query
->node_idx
,
777 * If heartbeat doesn't consider the node live, tell it
778 * to back off and try again. This gives heartbeat a chance
781 if (!o2hb_check_node_heartbeating(query
->node_idx
)) {
782 mlog(0, "node %u is not in our live map yet\n",
785 packet
.code
= JOIN_DISALLOW
;
789 packet
.code
= JOIN_OK_NO_MAP
;
791 spin_lock(&dlm_domain_lock
);
792 dlm
= __dlm_lookup_domain_full(query
->domain
, query
->name_len
);
797 * There is a small window where the joining node may not see the
798 * node(s) that just left but still part of the cluster. DISALLOW
799 * join request if joining node has different node map.
802 while (nodenum
< O2NM_MAX_NODES
) {
803 if (test_bit(nodenum
, dlm
->domain_map
)) {
804 if (!byte_test_bit(nodenum
, query
->node_map
)) {
805 mlog(0, "disallow join as node %u does not "
806 "have node %u in its nodemap\n",
807 query
->node_idx
, nodenum
);
808 packet
.code
= JOIN_DISALLOW
;
815 /* Once the dlm ctxt is marked as leaving then we don't want
816 * to be put in someone's domain map.
817 * Also, explicitly disallow joining at certain troublesome
818 * times (ie. during recovery). */
819 if (dlm
&& dlm
->dlm_state
!= DLM_CTXT_LEAVING
) {
820 int bit
= query
->node_idx
;
821 spin_lock(&dlm
->spinlock
);
823 if (dlm
->dlm_state
== DLM_CTXT_NEW
&&
824 dlm
->joining_node
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
825 /*If this is a brand new context and we
826 * haven't started our join process yet, then
827 * the other node won the race. */
828 packet
.code
= JOIN_OK_NO_MAP
;
829 } else if (dlm
->joining_node
!= DLM_LOCK_RES_OWNER_UNKNOWN
) {
830 /* Disallow parallel joins. */
831 packet
.code
= JOIN_DISALLOW
;
832 } else if (dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
) {
833 mlog(0, "node %u trying to join, but recovery "
834 "is ongoing.\n", bit
);
835 packet
.code
= JOIN_DISALLOW
;
836 } else if (test_bit(bit
, dlm
->recovery_map
)) {
837 mlog(0, "node %u trying to join, but it "
838 "still needs recovery.\n", bit
);
839 packet
.code
= JOIN_DISALLOW
;
840 } else if (test_bit(bit
, dlm
->domain_map
)) {
841 mlog(0, "node %u trying to join, but it "
842 "is still in the domain! needs recovery?\n",
844 packet
.code
= JOIN_DISALLOW
;
846 /* Alright we're fully a part of this domain
847 * so we keep some state as to who's joining
848 * and indicate to him that needs to be fixed
851 /* Make sure we speak compatible locking protocols. */
852 if (dlm_query_join_proto_check("DLM", bit
,
853 &dlm
->dlm_locking_proto
,
854 &query
->dlm_proto
)) {
855 packet
.code
= JOIN_PROTOCOL_MISMATCH
;
856 } else if (dlm_query_join_proto_check("fs", bit
,
857 &dlm
->fs_locking_proto
,
859 packet
.code
= JOIN_PROTOCOL_MISMATCH
;
861 packet
.dlm_minor
= query
->dlm_proto
.pv_minor
;
862 packet
.fs_minor
= query
->fs_proto
.pv_minor
;
863 packet
.code
= JOIN_OK
;
864 __dlm_set_joining_node(dlm
, query
->node_idx
);
868 spin_unlock(&dlm
->spinlock
);
871 spin_unlock(&dlm_domain_lock
);
874 mlog(0, "We respond with %u\n", packet
.code
);
876 dlm_query_join_packet_to_wire(&packet
, &response
);
880 static int dlm_assert_joined_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
883 struct dlm_assert_joined
*assert;
884 struct dlm_ctxt
*dlm
= NULL
;
886 assert = (struct dlm_assert_joined
*) msg
->buf
;
888 mlog(0, "node %u asserts join on domain %s\n", assert->node_idx
,
891 spin_lock(&dlm_domain_lock
);
892 dlm
= __dlm_lookup_domain_full(assert->domain
, assert->name_len
);
894 spin_lock(&dlm
->spinlock
);
896 /* Alright, this node has officially joined our
897 * domain. Set him in the map and clean up our
898 * leftover join state. */
899 BUG_ON(dlm
->joining_node
!= assert->node_idx
);
900 set_bit(assert->node_idx
, dlm
->domain_map
);
901 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
903 printk(KERN_NOTICE
"o2dlm: Node %u joins domain %s\n",
904 assert->node_idx
, dlm
->name
);
905 __dlm_print_nodes(dlm
);
907 /* notify anything attached to the heartbeat events */
908 dlm_hb_event_notify_attached(dlm
, assert->node_idx
, 1);
910 spin_unlock(&dlm
->spinlock
);
912 spin_unlock(&dlm_domain_lock
);
917 static int dlm_cancel_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
920 struct dlm_cancel_join
*cancel
;
921 struct dlm_ctxt
*dlm
= NULL
;
923 cancel
= (struct dlm_cancel_join
*) msg
->buf
;
925 mlog(0, "node %u cancels join on domain %s\n", cancel
->node_idx
,
928 spin_lock(&dlm_domain_lock
);
929 dlm
= __dlm_lookup_domain_full(cancel
->domain
, cancel
->name_len
);
932 spin_lock(&dlm
->spinlock
);
934 /* Yikes, this guy wants to cancel his join. No
935 * problem, we simply cleanup our join state. */
936 BUG_ON(dlm
->joining_node
!= cancel
->node_idx
);
937 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
939 spin_unlock(&dlm
->spinlock
);
941 spin_unlock(&dlm_domain_lock
);
946 static int dlm_send_one_join_cancel(struct dlm_ctxt
*dlm
,
950 struct dlm_cancel_join cancel_msg
;
952 memset(&cancel_msg
, 0, sizeof(cancel_msg
));
953 cancel_msg
.node_idx
= dlm
->node_num
;
954 cancel_msg
.name_len
= strlen(dlm
->name
);
955 memcpy(cancel_msg
.domain
, dlm
->name
, cancel_msg
.name_len
);
957 status
= o2net_send_message(DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
958 &cancel_msg
, sizeof(cancel_msg
), node
,
961 mlog(ML_ERROR
, "Error %d when sending message %u (key 0x%x) to "
962 "node %u\n", status
, DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
971 /* map_size should be in bytes. */
972 static int dlm_send_join_cancels(struct dlm_ctxt
*dlm
,
973 unsigned long *node_map
,
974 unsigned int map_size
)
979 if (map_size
!= (BITS_TO_LONGS(O2NM_MAX_NODES
) *
980 sizeof(unsigned long))) {
982 "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
983 map_size
, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES
));
989 while ((node
= find_next_bit(node_map
, O2NM_MAX_NODES
,
990 node
+ 1)) < O2NM_MAX_NODES
) {
991 if (node
== dlm
->node_num
)
994 tmpstat
= dlm_send_one_join_cancel(dlm
, node
);
996 mlog(ML_ERROR
, "Error return %d cancelling join on "
997 "node %d\n", tmpstat
, node
);
1008 static int dlm_request_join(struct dlm_ctxt
*dlm
,
1010 enum dlm_query_join_response_code
*response
)
1013 struct dlm_query_join_request join_msg
;
1014 struct dlm_query_join_packet packet
;
1017 mlog(0, "querying node %d\n", node
);
1019 memset(&join_msg
, 0, sizeof(join_msg
));
1020 join_msg
.node_idx
= dlm
->node_num
;
1021 join_msg
.name_len
= strlen(dlm
->name
);
1022 memcpy(join_msg
.domain
, dlm
->name
, join_msg
.name_len
);
1023 join_msg
.dlm_proto
= dlm
->dlm_locking_proto
;
1024 join_msg
.fs_proto
= dlm
->fs_locking_proto
;
1026 /* copy live node map to join message */
1027 byte_copymap(join_msg
.node_map
, dlm
->live_nodes_map
, O2NM_MAX_NODES
);
1029 status
= o2net_send_message(DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
, &join_msg
,
1030 sizeof(join_msg
), node
, &join_resp
);
1031 if (status
< 0 && status
!= -ENOPROTOOPT
) {
1032 mlog(ML_ERROR
, "Error %d when sending message %u (key 0x%x) to "
1033 "node %u\n", status
, DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
,
1037 dlm_query_join_wire_to_packet(join_resp
, &packet
);
1039 /* -ENOPROTOOPT from the net code means the other side isn't
1040 listening for our message type -- that's fine, it means
1041 his dlm isn't up, so we can consider him a 'yes' but not
1042 joined into the domain. */
1043 if (status
== -ENOPROTOOPT
) {
1045 *response
= JOIN_OK_NO_MAP
;
1046 } else if (packet
.code
== JOIN_DISALLOW
||
1047 packet
.code
== JOIN_OK_NO_MAP
) {
1048 *response
= packet
.code
;
1049 } else if (packet
.code
== JOIN_PROTOCOL_MISMATCH
) {
1051 "This node requested DLM locking protocol %u.%u and "
1052 "filesystem locking protocol %u.%u. At least one of "
1053 "the protocol versions on node %d is not compatible, "
1055 dlm
->dlm_locking_proto
.pv_major
,
1056 dlm
->dlm_locking_proto
.pv_minor
,
1057 dlm
->fs_locking_proto
.pv_major
,
1058 dlm
->fs_locking_proto
.pv_minor
,
1061 *response
= packet
.code
;
1062 } else if (packet
.code
== JOIN_OK
) {
1063 *response
= packet
.code
;
1064 /* Use the same locking protocol as the remote node */
1065 dlm
->dlm_locking_proto
.pv_minor
= packet
.dlm_minor
;
1066 dlm
->fs_locking_proto
.pv_minor
= packet
.fs_minor
;
1068 "Node %d responds JOIN_OK with DLM locking protocol "
1069 "%u.%u and fs locking protocol %u.%u\n",
1071 dlm
->dlm_locking_proto
.pv_major
,
1072 dlm
->dlm_locking_proto
.pv_minor
,
1073 dlm
->fs_locking_proto
.pv_major
,
1074 dlm
->fs_locking_proto
.pv_minor
);
1077 mlog(ML_ERROR
, "invalid response %d from node %u\n",
1081 mlog(0, "status %d, node %d response is %d\n", status
, node
,
1088 static int dlm_send_one_join_assert(struct dlm_ctxt
*dlm
,
1092 struct dlm_assert_joined assert_msg
;
1094 mlog(0, "Sending join assert to node %u\n", node
);
1096 memset(&assert_msg
, 0, sizeof(assert_msg
));
1097 assert_msg
.node_idx
= dlm
->node_num
;
1098 assert_msg
.name_len
= strlen(dlm
->name
);
1099 memcpy(assert_msg
.domain
, dlm
->name
, assert_msg
.name_len
);
1101 status
= o2net_send_message(DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
1102 &assert_msg
, sizeof(assert_msg
), node
,
1105 mlog(ML_ERROR
, "Error %d when sending message %u (key 0x%x) to "
1106 "node %u\n", status
, DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
1112 static void dlm_send_join_asserts(struct dlm_ctxt
*dlm
,
1113 unsigned long *node_map
)
1115 int status
, node
, live
;
1119 while ((node
= find_next_bit(node_map
, O2NM_MAX_NODES
,
1120 node
+ 1)) < O2NM_MAX_NODES
) {
1121 if (node
== dlm
->node_num
)
1125 /* It is very important that this message be
1126 * received so we spin until either the node
1127 * has died or it gets the message. */
1128 status
= dlm_send_one_join_assert(dlm
, node
);
1130 spin_lock(&dlm
->spinlock
);
1131 live
= test_bit(node
, dlm
->live_nodes_map
);
1132 spin_unlock(&dlm
->spinlock
);
1135 mlog(ML_ERROR
, "Error return %d asserting "
1136 "join on node %d\n", status
, node
);
1138 /* give us some time between errors... */
1140 msleep(DLM_DOMAIN_BACKOFF_MS
);
1142 } while (status
&& live
);
1146 struct domain_join_ctxt
{
1147 unsigned long live_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1148 unsigned long yes_resp_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1151 static int dlm_should_restart_join(struct dlm_ctxt
*dlm
,
1152 struct domain_join_ctxt
*ctxt
,
1153 enum dlm_query_join_response_code response
)
1157 if (response
== JOIN_DISALLOW
) {
1158 mlog(0, "Latest response of disallow -- should restart\n");
1162 spin_lock(&dlm
->spinlock
);
1163 /* For now, we restart the process if the node maps have
1165 ret
= memcmp(ctxt
->live_map
, dlm
->live_nodes_map
,
1166 sizeof(dlm
->live_nodes_map
));
1167 spin_unlock(&dlm
->spinlock
);
1170 mlog(0, "Node maps changed -- should restart\n");
1175 static int dlm_try_to_join_domain(struct dlm_ctxt
*dlm
)
1177 int status
= 0, tmpstat
, node
;
1178 struct domain_join_ctxt
*ctxt
;
1179 enum dlm_query_join_response_code response
= JOIN_DISALLOW
;
1181 mlog_entry("%p", dlm
);
1183 ctxt
= kzalloc(sizeof(*ctxt
), GFP_KERNEL
);
1190 /* group sem locking should work for us here -- we're already
1191 * registered for heartbeat events so filling this should be
1192 * atomic wrt getting those handlers called. */
1193 o2hb_fill_node_map(dlm
->live_nodes_map
, sizeof(dlm
->live_nodes_map
));
1195 spin_lock(&dlm
->spinlock
);
1196 memcpy(ctxt
->live_map
, dlm
->live_nodes_map
, sizeof(ctxt
->live_map
));
1198 __dlm_set_joining_node(dlm
, dlm
->node_num
);
1200 spin_unlock(&dlm
->spinlock
);
1203 while ((node
= find_next_bit(ctxt
->live_map
, O2NM_MAX_NODES
,
1204 node
+ 1)) < O2NM_MAX_NODES
) {
1205 if (node
== dlm
->node_num
)
1208 status
= dlm_request_join(dlm
, node
, &response
);
1214 /* Ok, either we got a response or the node doesn't have a
1216 if (response
== JOIN_OK
)
1217 set_bit(node
, ctxt
->yes_resp_map
);
1219 if (dlm_should_restart_join(dlm
, ctxt
, response
)) {
1225 mlog(0, "Yay, done querying nodes!\n");
1227 /* Yay, everyone agree's we can join the domain. My domain is
1228 * comprised of all nodes who were put in the
1229 * yes_resp_map. Copy that into our domain map and send a join
1230 * assert message to clean up everyone elses state. */
1231 spin_lock(&dlm
->spinlock
);
1232 memcpy(dlm
->domain_map
, ctxt
->yes_resp_map
,
1233 sizeof(ctxt
->yes_resp_map
));
1234 set_bit(dlm
->node_num
, dlm
->domain_map
);
1235 spin_unlock(&dlm
->spinlock
);
1237 dlm_send_join_asserts(dlm
, ctxt
->yes_resp_map
);
1239 /* Joined state *must* be set before the joining node
1240 * information, otherwise the query_join handler may read no
1241 * current joiner but a state of NEW and tell joining nodes
1242 * we're not in the domain. */
1243 spin_lock(&dlm_domain_lock
);
1244 dlm
->dlm_state
= DLM_CTXT_JOINED
;
1246 spin_unlock(&dlm_domain_lock
);
1249 spin_lock(&dlm
->spinlock
);
1250 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
1252 __dlm_print_nodes(dlm
);
1253 spin_unlock(&dlm
->spinlock
);
1256 /* Do we need to send a cancel message to any nodes? */
1258 tmpstat
= dlm_send_join_cancels(dlm
,
1260 sizeof(ctxt
->yes_resp_map
));
1262 mlog_errno(tmpstat
);
1267 mlog(0, "returning %d\n", status
);
1271 static void dlm_unregister_domain_handlers(struct dlm_ctxt
*dlm
)
1273 o2hb_unregister_callback(NULL
, &dlm
->dlm_hb_up
);
1274 o2hb_unregister_callback(NULL
, &dlm
->dlm_hb_down
);
1275 o2net_unregister_handler_list(&dlm
->dlm_domain_handlers
);
1278 static int dlm_register_domain_handlers(struct dlm_ctxt
*dlm
)
1282 mlog(0, "registering handlers.\n");
1284 o2hb_setup_callback(&dlm
->dlm_hb_down
, O2HB_NODE_DOWN_CB
,
1285 dlm_hb_node_down_cb
, dlm
, DLM_HB_NODE_DOWN_PRI
);
1286 status
= o2hb_register_callback(NULL
, &dlm
->dlm_hb_down
);
1290 o2hb_setup_callback(&dlm
->dlm_hb_up
, O2HB_NODE_UP_CB
,
1291 dlm_hb_node_up_cb
, dlm
, DLM_HB_NODE_UP_PRI
);
1292 status
= o2hb_register_callback(NULL
, &dlm
->dlm_hb_up
);
1296 status
= o2net_register_handler(DLM_MASTER_REQUEST_MSG
, dlm
->key
,
1297 sizeof(struct dlm_master_request
),
1298 dlm_master_request_handler
,
1299 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1303 status
= o2net_register_handler(DLM_ASSERT_MASTER_MSG
, dlm
->key
,
1304 sizeof(struct dlm_assert_master
),
1305 dlm_assert_master_handler
,
1306 dlm
, dlm_assert_master_post_handler
,
1307 &dlm
->dlm_domain_handlers
);
1311 status
= o2net_register_handler(DLM_CREATE_LOCK_MSG
, dlm
->key
,
1312 sizeof(struct dlm_create_lock
),
1313 dlm_create_lock_handler
,
1314 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1318 status
= o2net_register_handler(DLM_CONVERT_LOCK_MSG
, dlm
->key
,
1319 DLM_CONVERT_LOCK_MAX_LEN
,
1320 dlm_convert_lock_handler
,
1321 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1325 status
= o2net_register_handler(DLM_UNLOCK_LOCK_MSG
, dlm
->key
,
1326 DLM_UNLOCK_LOCK_MAX_LEN
,
1327 dlm_unlock_lock_handler
,
1328 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1332 status
= o2net_register_handler(DLM_PROXY_AST_MSG
, dlm
->key
,
1333 DLM_PROXY_AST_MAX_LEN
,
1334 dlm_proxy_ast_handler
,
1335 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1339 status
= o2net_register_handler(DLM_EXIT_DOMAIN_MSG
, dlm
->key
,
1340 sizeof(struct dlm_exit_domain
),
1341 dlm_exit_domain_handler
,
1342 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1346 status
= o2net_register_handler(DLM_DEREF_LOCKRES_MSG
, dlm
->key
,
1347 sizeof(struct dlm_deref_lockres
),
1348 dlm_deref_lockres_handler
,
1349 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1353 status
= o2net_register_handler(DLM_MIGRATE_REQUEST_MSG
, dlm
->key
,
1354 sizeof(struct dlm_migrate_request
),
1355 dlm_migrate_request_handler
,
1356 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1360 status
= o2net_register_handler(DLM_MIG_LOCKRES_MSG
, dlm
->key
,
1361 DLM_MIG_LOCKRES_MAX_LEN
,
1362 dlm_mig_lockres_handler
,
1363 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1367 status
= o2net_register_handler(DLM_MASTER_REQUERY_MSG
, dlm
->key
,
1368 sizeof(struct dlm_master_requery
),
1369 dlm_master_requery_handler
,
1370 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1374 status
= o2net_register_handler(DLM_LOCK_REQUEST_MSG
, dlm
->key
,
1375 sizeof(struct dlm_lock_request
),
1376 dlm_request_all_locks_handler
,
1377 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1381 status
= o2net_register_handler(DLM_RECO_DATA_DONE_MSG
, dlm
->key
,
1382 sizeof(struct dlm_reco_data_done
),
1383 dlm_reco_data_done_handler
,
1384 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1388 status
= o2net_register_handler(DLM_BEGIN_RECO_MSG
, dlm
->key
,
1389 sizeof(struct dlm_begin_reco
),
1390 dlm_begin_reco_handler
,
1391 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1395 status
= o2net_register_handler(DLM_FINALIZE_RECO_MSG
, dlm
->key
,
1396 sizeof(struct dlm_finalize_reco
),
1397 dlm_finalize_reco_handler
,
1398 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1404 dlm_unregister_domain_handlers(dlm
);
1409 static int dlm_join_domain(struct dlm_ctxt
*dlm
)
1412 unsigned int backoff
;
1413 unsigned int total_backoff
= 0;
1417 mlog(0, "Join domain %s\n", dlm
->name
);
1419 status
= dlm_register_domain_handlers(dlm
);
1425 status
= dlm_debug_init(dlm
);
1431 status
= dlm_launch_thread(dlm
);
1437 status
= dlm_launch_recovery_thread(dlm
);
1443 dlm
->dlm_worker
= create_singlethread_workqueue("dlm_wq");
1444 if (!dlm
->dlm_worker
) {
1451 status
= dlm_try_to_join_domain(dlm
);
1453 /* If we're racing another node to the join, then we
1454 * need to back off temporarily and let them
1456 #define DLM_JOIN_TIMEOUT_MSECS 90000
1457 if (status
== -EAGAIN
) {
1458 if (signal_pending(current
)) {
1459 status
= -ERESTARTSYS
;
1464 msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS
)) {
1465 status
= -ERESTARTSYS
;
1466 mlog(ML_NOTICE
, "Timed out joining dlm domain "
1467 "%s after %u msecs\n", dlm
->name
,
1468 jiffies_to_msecs(total_backoff
));
1474 * <dale> No, after you!
1476 * <dale> But you first!
1479 backoff
= (unsigned int)(jiffies
& 0x3);
1480 backoff
*= DLM_DOMAIN_BACKOFF_MS
;
1481 total_backoff
+= backoff
;
1482 mlog(0, "backoff %d\n", backoff
);
1485 } while (status
== -EAGAIN
);
1494 wake_up(&dlm_domain_events
);
1497 dlm_unregister_domain_handlers(dlm
);
1498 dlm_debug_shutdown(dlm
);
1499 dlm_complete_thread(dlm
);
1500 dlm_complete_recovery_thread(dlm
);
1501 dlm_destroy_dlm_worker(dlm
);
1507 static struct dlm_ctxt
*dlm_alloc_ctxt(const char *domain
,
1512 struct dlm_ctxt
*dlm
= NULL
;
1514 dlm
= kzalloc(sizeof(*dlm
), GFP_KERNEL
);
1516 mlog_errno(-ENOMEM
);
1520 dlm
->name
= kstrdup(domain
, GFP_KERNEL
);
1521 if (dlm
->name
== NULL
) {
1522 mlog_errno(-ENOMEM
);
1528 dlm
->lockres_hash
= (struct hlist_head
**)dlm_alloc_pagevec(DLM_HASH_PAGES
);
1529 if (!dlm
->lockres_hash
) {
1530 mlog_errno(-ENOMEM
);
1537 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++)
1538 INIT_HLIST_HEAD(dlm_lockres_hash(dlm
, i
));
1540 dlm
->master_hash
= (struct hlist_head
**)
1541 dlm_alloc_pagevec(DLM_HASH_PAGES
);
1542 if (!dlm
->master_hash
) {
1543 mlog_errno(-ENOMEM
);
1544 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
1551 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++)
1552 INIT_HLIST_HEAD(dlm_master_hash(dlm
, i
));
1555 dlm
->node_num
= o2nm_this_node();
1557 ret
= dlm_create_debugfs_subroot(dlm
);
1559 dlm_free_pagevec((void **)dlm
->master_hash
, DLM_HASH_PAGES
);
1560 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
1567 spin_lock_init(&dlm
->spinlock
);
1568 spin_lock_init(&dlm
->master_lock
);
1569 spin_lock_init(&dlm
->ast_lock
);
1570 spin_lock_init(&dlm
->track_lock
);
1571 INIT_LIST_HEAD(&dlm
->list
);
1572 INIT_LIST_HEAD(&dlm
->dirty_list
);
1573 INIT_LIST_HEAD(&dlm
->reco
.resources
);
1574 INIT_LIST_HEAD(&dlm
->reco
.received
);
1575 INIT_LIST_HEAD(&dlm
->reco
.node_data
);
1576 INIT_LIST_HEAD(&dlm
->purge_list
);
1577 INIT_LIST_HEAD(&dlm
->dlm_domain_handlers
);
1578 INIT_LIST_HEAD(&dlm
->tracking_list
);
1579 dlm
->reco
.state
= 0;
1581 INIT_LIST_HEAD(&dlm
->pending_asts
);
1582 INIT_LIST_HEAD(&dlm
->pending_basts
);
1584 mlog(0, "dlm->recovery_map=%p, &(dlm->recovery_map[0])=%p\n",
1585 dlm
->recovery_map
, &(dlm
->recovery_map
[0]));
1587 memset(dlm
->recovery_map
, 0, sizeof(dlm
->recovery_map
));
1588 memset(dlm
->live_nodes_map
, 0, sizeof(dlm
->live_nodes_map
));
1589 memset(dlm
->domain_map
, 0, sizeof(dlm
->domain_map
));
1591 dlm
->dlm_thread_task
= NULL
;
1592 dlm
->dlm_reco_thread_task
= NULL
;
1593 dlm
->dlm_worker
= NULL
;
1594 init_waitqueue_head(&dlm
->dlm_thread_wq
);
1595 init_waitqueue_head(&dlm
->dlm_reco_thread_wq
);
1596 init_waitqueue_head(&dlm
->reco
.event
);
1597 init_waitqueue_head(&dlm
->ast_wq
);
1598 init_waitqueue_head(&dlm
->migration_wq
);
1599 INIT_LIST_HEAD(&dlm
->mle_hb_events
);
1601 dlm
->joining_node
= DLM_LOCK_RES_OWNER_UNKNOWN
;
1602 init_waitqueue_head(&dlm
->dlm_join_events
);
1604 dlm
->reco
.new_master
= O2NM_INVALID_NODE_NUM
;
1605 dlm
->reco
.dead_node
= O2NM_INVALID_NODE_NUM
;
1607 atomic_set(&dlm
->res_tot_count
, 0);
1608 atomic_set(&dlm
->res_cur_count
, 0);
1609 for (i
= 0; i
< DLM_MLE_NUM_TYPES
; ++i
) {
1610 atomic_set(&dlm
->mle_tot_count
[i
], 0);
1611 atomic_set(&dlm
->mle_cur_count
[i
], 0);
1614 spin_lock_init(&dlm
->work_lock
);
1615 INIT_LIST_HEAD(&dlm
->work_list
);
1616 INIT_WORK(&dlm
->dispatched_work
, dlm_dispatch_work
);
1618 kref_init(&dlm
->dlm_refs
);
1619 dlm
->dlm_state
= DLM_CTXT_NEW
;
1621 INIT_LIST_HEAD(&dlm
->dlm_eviction_callbacks
);
1623 mlog(0, "context init: refcount %u\n",
1624 atomic_read(&dlm
->dlm_refs
.refcount
));
1631 * Compare a requested locking protocol version against the current one.
1633 * If the major numbers are different, they are incompatible.
1634 * If the current minor is greater than the request, they are incompatible.
1635 * If the current minor is less than or equal to the request, they are
1636 * compatible, and the requester should run at the current minor version.
1638 static int dlm_protocol_compare(struct dlm_protocol_version
*existing
,
1639 struct dlm_protocol_version
*request
)
1641 if (existing
->pv_major
!= request
->pv_major
)
1644 if (existing
->pv_minor
> request
->pv_minor
)
1647 if (existing
->pv_minor
< request
->pv_minor
)
1648 request
->pv_minor
= existing
->pv_minor
;
1654 * dlm_register_domain: one-time setup per "domain".
1656 * The filesystem passes in the requested locking version via proto.
1657 * If registration was successful, proto will contain the negotiated
1660 struct dlm_ctxt
* dlm_register_domain(const char *domain
,
1662 struct dlm_protocol_version
*fs_proto
)
1665 struct dlm_ctxt
*dlm
= NULL
;
1666 struct dlm_ctxt
*new_ctxt
= NULL
;
1668 if (strlen(domain
) >= O2NM_MAX_NAME_LEN
) {
1669 ret
= -ENAMETOOLONG
;
1670 mlog(ML_ERROR
, "domain name length too long\n");
1674 if (!o2hb_check_local_node_heartbeating()) {
1675 mlog(ML_ERROR
, "the local node has not been configured, or is "
1676 "not heartbeating\n");
1681 mlog(0, "register called for domain \"%s\"\n", domain
);
1685 if (signal_pending(current
)) {
1691 spin_lock(&dlm_domain_lock
);
1693 dlm
= __dlm_lookup_domain(domain
);
1695 if (dlm
->dlm_state
!= DLM_CTXT_JOINED
) {
1696 spin_unlock(&dlm_domain_lock
);
1698 mlog(0, "This ctxt is not joined yet!\n");
1699 wait_event_interruptible(dlm_domain_events
,
1700 dlm_wait_on_domain_helper(
1705 if (dlm_protocol_compare(&dlm
->fs_locking_proto
, fs_proto
)) {
1706 spin_unlock(&dlm_domain_lock
);
1708 "Requested locking protocol version is not "
1709 "compatible with already registered domain "
1710 "\"%s\"\n", domain
);
1718 spin_unlock(&dlm_domain_lock
);
1726 spin_unlock(&dlm_domain_lock
);
1728 new_ctxt
= dlm_alloc_ctxt(domain
, key
);
1737 /* a little variable switch-a-roo here... */
1741 /* add the new domain */
1742 list_add_tail(&dlm
->list
, &dlm_domains
);
1743 spin_unlock(&dlm_domain_lock
);
1746 * Pass the locking protocol version into the join. If the join
1747 * succeeds, it will have the negotiated protocol set.
1749 dlm
->dlm_locking_proto
= dlm_protocol
;
1750 dlm
->fs_locking_proto
= *fs_proto
;
1752 ret
= dlm_join_domain(dlm
);
1759 /* Tell the caller what locking protocol we negotiated */
1760 *fs_proto
= dlm
->fs_locking_proto
;
1765 dlm_free_ctxt_mem(new_ctxt
);
1772 EXPORT_SYMBOL_GPL(dlm_register_domain
);
1774 static LIST_HEAD(dlm_join_handlers
);
1776 static void dlm_unregister_net_handlers(void)
1778 o2net_unregister_handler_list(&dlm_join_handlers
);
1781 static int dlm_register_net_handlers(void)
1785 status
= o2net_register_handler(DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
,
1786 sizeof(struct dlm_query_join_request
),
1787 dlm_query_join_handler
,
1788 NULL
, NULL
, &dlm_join_handlers
);
1792 status
= o2net_register_handler(DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
1793 sizeof(struct dlm_assert_joined
),
1794 dlm_assert_joined_handler
,
1795 NULL
, NULL
, &dlm_join_handlers
);
1799 status
= o2net_register_handler(DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
1800 sizeof(struct dlm_cancel_join
),
1801 dlm_cancel_join_handler
,
1802 NULL
, NULL
, &dlm_join_handlers
);
1806 dlm_unregister_net_handlers();
1811 /* Domain eviction callback handling.
1813 * The file system requires notification of node death *before* the
1814 * dlm completes it's recovery work, otherwise it may be able to
1815 * acquire locks on resources requiring recovery. Since the dlm can
1816 * evict a node from it's domain *before* heartbeat fires, a similar
1817 * mechanism is required. */
1819 /* Eviction is not expected to happen often, so a per-domain lock is
1820 * not necessary. Eviction callbacks are allowed to sleep for short
1821 * periods of time. */
1822 static DECLARE_RWSEM(dlm_callback_sem
);
1824 void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt
*dlm
,
1827 struct list_head
*iter
;
1828 struct dlm_eviction_cb
*cb
;
1830 down_read(&dlm_callback_sem
);
1831 list_for_each(iter
, &dlm
->dlm_eviction_callbacks
) {
1832 cb
= list_entry(iter
, struct dlm_eviction_cb
, ec_item
);
1834 cb
->ec_func(node_num
, cb
->ec_data
);
1836 up_read(&dlm_callback_sem
);
1839 void dlm_setup_eviction_cb(struct dlm_eviction_cb
*cb
,
1840 dlm_eviction_func
*f
,
1843 INIT_LIST_HEAD(&cb
->ec_item
);
1847 EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb
);
1849 void dlm_register_eviction_cb(struct dlm_ctxt
*dlm
,
1850 struct dlm_eviction_cb
*cb
)
1852 down_write(&dlm_callback_sem
);
1853 list_add_tail(&cb
->ec_item
, &dlm
->dlm_eviction_callbacks
);
1854 up_write(&dlm_callback_sem
);
1856 EXPORT_SYMBOL_GPL(dlm_register_eviction_cb
);
1858 void dlm_unregister_eviction_cb(struct dlm_eviction_cb
*cb
)
1860 down_write(&dlm_callback_sem
);
1861 list_del_init(&cb
->ec_item
);
1862 up_write(&dlm_callback_sem
);
1864 EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb
);
1866 static int __init
dlm_init(void)
1870 dlm_print_version();
1872 status
= dlm_init_mle_cache();
1874 mlog(ML_ERROR
, "Could not create o2dlm_mle slabcache\n");
1878 status
= dlm_init_master_caches();
1880 mlog(ML_ERROR
, "Could not create o2dlm_lockres and "
1881 "o2dlm_lockname slabcaches\n");
1885 status
= dlm_init_lock_cache();
1887 mlog(ML_ERROR
, "Count not create o2dlm_lock slabcache\n");
1891 status
= dlm_register_net_handlers();
1893 mlog(ML_ERROR
, "Unable to register network handlers\n");
1897 status
= dlm_create_debugfs_root();
1903 dlm_unregister_net_handlers();
1904 dlm_destroy_lock_cache();
1905 dlm_destroy_master_caches();
1906 dlm_destroy_mle_cache();
1910 static void __exit
dlm_exit (void)
1912 dlm_destroy_debugfs_root();
1913 dlm_unregister_net_handlers();
1914 dlm_destroy_lock_cache();
1915 dlm_destroy_master_caches();
1916 dlm_destroy_mle_cache();
1919 MODULE_AUTHOR("Oracle");
1920 MODULE_LICENSE("GPL");
1922 module_init(dlm_init
);
1923 module_exit(dlm_exit
);