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"
52 * ocfs2 node maps are array of long int, which limits to send them freely
53 * across the wire due to endianness issues. To workaround this, we convert
54 * long ints to byte arrays. Following 3 routines are helper functions to
55 * set/test/copy bits within those array of bytes
57 static inline void byte_set_bit(u8 nr
, u8 map
[])
59 map
[nr
>> 3] |= (1UL << (nr
& 7));
62 static inline int byte_test_bit(u8 nr
, u8 map
[])
64 return ((1UL << (nr
& 7)) & (map
[nr
>> 3])) != 0;
67 static inline void byte_copymap(u8 dmap
[], unsigned long smap
[],
75 memset(dmap
, 0, ((sz
+ 7) >> 3));
76 for (nn
= 0 ; nn
< sz
; nn
++)
77 if (test_bit(nn
, smap
))
78 byte_set_bit(nn
, dmap
);
81 static void dlm_free_pagevec(void **vec
, int pages
)
84 free_page((unsigned long)vec
[pages
]);
88 static void **dlm_alloc_pagevec(int pages
)
90 void **vec
= kmalloc(pages
* sizeof(void *), GFP_KERNEL
);
96 for (i
= 0; i
< pages
; i
++)
97 if (!(vec
[i
] = (void *)__get_free_page(GFP_KERNEL
)))
100 mlog(0, "Allocated DLM hash pagevec; %d pages (%lu expected), %lu buckets per page\n",
101 pages
, (unsigned long)DLM_HASH_PAGES
,
102 (unsigned long)DLM_BUCKETS_PER_PAGE
);
105 dlm_free_pagevec(vec
, i
);
111 * spinlock lock ordering: if multiple locks are needed, obey this ordering:
113 * struct dlm_ctxt->spinlock
114 * struct dlm_lock_resource->spinlock
115 * struct dlm_ctxt->master_lock
116 * struct dlm_ctxt->ast_lock
117 * dlm_master_list_entry->spinlock
122 DEFINE_SPINLOCK(dlm_domain_lock
);
123 LIST_HEAD(dlm_domains
);
124 static DECLARE_WAIT_QUEUE_HEAD(dlm_domain_events
);
127 * The supported protocol version for DLM communication. Running domains
128 * will have a negotiated version with the same major number and a minor
129 * number equal or smaller. The dlm_ctxt->dlm_locking_proto field should
130 * be used to determine what a running domain is actually using.
132 static const struct dlm_protocol_version dlm_protocol
= {
137 #define DLM_DOMAIN_BACKOFF_MS 200
139 static int dlm_query_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
141 static int dlm_assert_joined_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
143 static int dlm_cancel_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
145 static int dlm_exit_domain_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
147 static int dlm_protocol_compare(struct dlm_protocol_version
*existing
,
148 struct dlm_protocol_version
*request
);
150 static void dlm_unregister_domain_handlers(struct dlm_ctxt
*dlm
);
152 void __dlm_unhash_lockres(struct dlm_lock_resource
*lockres
)
154 if (!hlist_unhashed(&lockres
->hash_node
)) {
155 hlist_del_init(&lockres
->hash_node
);
156 dlm_lockres_put(lockres
);
160 void __dlm_insert_lockres(struct dlm_ctxt
*dlm
,
161 struct dlm_lock_resource
*res
)
163 struct hlist_head
*bucket
;
166 assert_spin_locked(&dlm
->spinlock
);
169 bucket
= dlm_lockres_hash(dlm
, q
->hash
);
171 /* get a reference for our hashtable */
172 dlm_lockres_get(res
);
174 hlist_add_head(&res
->hash_node
, bucket
);
177 struct dlm_lock_resource
* __dlm_lookup_lockres_full(struct dlm_ctxt
*dlm
,
182 struct hlist_head
*bucket
;
183 struct hlist_node
*list
;
185 mlog_entry("%.*s\n", len
, name
);
187 assert_spin_locked(&dlm
->spinlock
);
189 bucket
= dlm_lockres_hash(dlm
, hash
);
191 hlist_for_each(list
, bucket
) {
192 struct dlm_lock_resource
*res
= hlist_entry(list
,
193 struct dlm_lock_resource
, hash_node
);
194 if (res
->lockname
.name
[0] != name
[0])
196 if (unlikely(res
->lockname
.len
!= len
))
198 if (memcmp(res
->lockname
.name
+ 1, name
+ 1, len
- 1))
200 dlm_lockres_get(res
);
206 /* intended to be called by functions which do not care about lock
207 * resources which are being purged (most net _handler functions).
208 * this will return NULL for any lock resource which is found but
209 * currently in the process of dropping its mastery reference.
210 * use __dlm_lookup_lockres_full when you need the lock resource
211 * regardless (e.g. dlm_get_lock_resource) */
212 struct dlm_lock_resource
* __dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
217 struct dlm_lock_resource
*res
= NULL
;
219 mlog_entry("%.*s\n", len
, name
);
221 assert_spin_locked(&dlm
->spinlock
);
223 res
= __dlm_lookup_lockres_full(dlm
, name
, len
, hash
);
225 spin_lock(&res
->spinlock
);
226 if (res
->state
& DLM_LOCK_RES_DROPPING_REF
) {
227 spin_unlock(&res
->spinlock
);
228 dlm_lockres_put(res
);
231 spin_unlock(&res
->spinlock
);
237 struct dlm_lock_resource
* dlm_lookup_lockres(struct dlm_ctxt
*dlm
,
241 struct dlm_lock_resource
*res
;
242 unsigned int hash
= dlm_lockid_hash(name
, len
);
244 spin_lock(&dlm
->spinlock
);
245 res
= __dlm_lookup_lockres(dlm
, name
, len
, hash
);
246 spin_unlock(&dlm
->spinlock
);
250 static struct dlm_ctxt
* __dlm_lookup_domain_full(const char *domain
, int len
)
252 struct dlm_ctxt
*tmp
= NULL
;
253 struct list_head
*iter
;
255 assert_spin_locked(&dlm_domain_lock
);
257 /* tmp->name here is always NULL terminated,
258 * but domain may not be! */
259 list_for_each(iter
, &dlm_domains
) {
260 tmp
= list_entry (iter
, struct dlm_ctxt
, list
);
261 if (strlen(tmp
->name
) == len
&&
262 memcmp(tmp
->name
, domain
, len
)==0)
270 /* For null terminated domain strings ONLY */
271 static struct dlm_ctxt
* __dlm_lookup_domain(const char *domain
)
273 assert_spin_locked(&dlm_domain_lock
);
275 return __dlm_lookup_domain_full(domain
, strlen(domain
));
279 /* returns true on one of two conditions:
280 * 1) the domain does not exist
281 * 2) the domain exists and it's state is "joined" */
282 static int dlm_wait_on_domain_helper(const char *domain
)
285 struct dlm_ctxt
*tmp
= NULL
;
287 spin_lock(&dlm_domain_lock
);
289 tmp
= __dlm_lookup_domain(domain
);
292 else if (tmp
->dlm_state
== DLM_CTXT_JOINED
)
295 spin_unlock(&dlm_domain_lock
);
299 static void dlm_free_ctxt_mem(struct dlm_ctxt
*dlm
)
301 dlm_destroy_debugfs_subroot(dlm
);
303 if (dlm
->lockres_hash
)
304 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
306 if (dlm
->master_hash
)
307 dlm_free_pagevec((void **)dlm
->master_hash
, DLM_HASH_PAGES
);
315 /* A little strange - this function will be called while holding
316 * dlm_domain_lock and is expected to be holding it on the way out. We
317 * will however drop and reacquire it multiple times */
318 static void dlm_ctxt_release(struct kref
*kref
)
320 struct dlm_ctxt
*dlm
;
322 dlm
= container_of(kref
, struct dlm_ctxt
, dlm_refs
);
324 BUG_ON(dlm
->num_joins
);
325 BUG_ON(dlm
->dlm_state
== DLM_CTXT_JOINED
);
327 /* we may still be in the list if we hit an error during join. */
328 list_del_init(&dlm
->list
);
330 spin_unlock(&dlm_domain_lock
);
332 mlog(0, "freeing memory from domain %s\n", dlm
->name
);
334 wake_up(&dlm_domain_events
);
336 dlm_free_ctxt_mem(dlm
);
338 spin_lock(&dlm_domain_lock
);
341 void dlm_put(struct dlm_ctxt
*dlm
)
343 spin_lock(&dlm_domain_lock
);
344 kref_put(&dlm
->dlm_refs
, dlm_ctxt_release
);
345 spin_unlock(&dlm_domain_lock
);
348 static void __dlm_get(struct dlm_ctxt
*dlm
)
350 kref_get(&dlm
->dlm_refs
);
353 /* given a questionable reference to a dlm object, gets a reference if
354 * it can find it in the list, otherwise returns NULL in which case
355 * you shouldn't trust your pointer. */
356 struct dlm_ctxt
*dlm_grab(struct dlm_ctxt
*dlm
)
358 struct list_head
*iter
;
359 struct dlm_ctxt
*target
= NULL
;
361 spin_lock(&dlm_domain_lock
);
363 list_for_each(iter
, &dlm_domains
) {
364 target
= list_entry (iter
, struct dlm_ctxt
, list
);
374 spin_unlock(&dlm_domain_lock
);
379 int dlm_domain_fully_joined(struct dlm_ctxt
*dlm
)
383 spin_lock(&dlm_domain_lock
);
384 ret
= (dlm
->dlm_state
== DLM_CTXT_JOINED
) ||
385 (dlm
->dlm_state
== DLM_CTXT_IN_SHUTDOWN
);
386 spin_unlock(&dlm_domain_lock
);
391 static void dlm_destroy_dlm_worker(struct dlm_ctxt
*dlm
)
393 if (dlm
->dlm_worker
) {
394 flush_workqueue(dlm
->dlm_worker
);
395 destroy_workqueue(dlm
->dlm_worker
);
396 dlm
->dlm_worker
= NULL
;
400 static void dlm_complete_dlm_shutdown(struct dlm_ctxt
*dlm
)
402 dlm_unregister_domain_handlers(dlm
);
403 dlm_debug_shutdown(dlm
);
404 dlm_complete_thread(dlm
);
405 dlm_complete_recovery_thread(dlm
);
406 dlm_destroy_dlm_worker(dlm
);
408 /* We've left the domain. Now we can take ourselves out of the
409 * list and allow the kref stuff to help us free the
411 spin_lock(&dlm_domain_lock
);
412 list_del_init(&dlm
->list
);
413 spin_unlock(&dlm_domain_lock
);
415 /* Wake up anyone waiting for us to remove this domain */
416 wake_up(&dlm_domain_events
);
419 static int dlm_migrate_all_locks(struct dlm_ctxt
*dlm
)
421 int i
, num
, n
, ret
= 0;
422 struct dlm_lock_resource
*res
;
423 struct hlist_node
*iter
;
424 struct hlist_head
*bucket
;
427 mlog(0, "Migrating locks from domain %s\n", dlm
->name
);
430 spin_lock(&dlm
->spinlock
);
431 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++) {
434 bucket
= dlm_lockres_hash(dlm
, i
);
435 iter
= bucket
->first
;
438 res
= hlist_entry(iter
, struct dlm_lock_resource
,
440 dlm_lockres_get(res
);
441 /* migrate, if necessary. this will drop the dlm
442 * spinlock and retake it if it does migration. */
443 dropped
= dlm_empty_lockres(dlm
, res
);
445 spin_lock(&res
->spinlock
);
446 __dlm_lockres_calc_usage(dlm
, res
);
447 iter
= res
->hash_node
.next
;
448 spin_unlock(&res
->spinlock
);
450 dlm_lockres_put(res
);
455 cond_resched_lock(&dlm
->spinlock
);
457 mlog(0, "%s: touched %d lockreses in bucket %d "
458 "(tot=%d)\n", dlm
->name
, n
, i
, num
);
460 spin_unlock(&dlm
->spinlock
);
461 wake_up(&dlm
->dlm_thread_wq
);
463 /* let the dlm thread take care of purging, keep scanning until
464 * nothing remains in the hash */
466 mlog(0, "%s: %d lock resources in hash last pass\n",
470 mlog(0, "DONE Migrating locks from domain %s\n", dlm
->name
);
474 static int dlm_no_joining_node(struct dlm_ctxt
*dlm
)
478 spin_lock(&dlm
->spinlock
);
479 ret
= dlm
->joining_node
== DLM_LOCK_RES_OWNER_UNKNOWN
;
480 spin_unlock(&dlm
->spinlock
);
485 static void dlm_mark_domain_leaving(struct dlm_ctxt
*dlm
)
487 /* Yikes, a double spinlock! I need domain_lock for the dlm
488 * state and the dlm spinlock for join state... Sorry! */
490 spin_lock(&dlm_domain_lock
);
491 spin_lock(&dlm
->spinlock
);
493 if (dlm
->joining_node
!= DLM_LOCK_RES_OWNER_UNKNOWN
) {
494 mlog(0, "Node %d is joining, we wait on it.\n",
496 spin_unlock(&dlm
->spinlock
);
497 spin_unlock(&dlm_domain_lock
);
499 wait_event(dlm
->dlm_join_events
, dlm_no_joining_node(dlm
));
503 dlm
->dlm_state
= DLM_CTXT_LEAVING
;
504 spin_unlock(&dlm
->spinlock
);
505 spin_unlock(&dlm_domain_lock
);
508 static void __dlm_print_nodes(struct dlm_ctxt
*dlm
)
512 assert_spin_locked(&dlm
->spinlock
);
514 printk(KERN_INFO
"ocfs2_dlm: Nodes in domain (\"%s\"): ", dlm
->name
);
516 while ((node
= find_next_bit(dlm
->domain_map
, O2NM_MAX_NODES
,
517 node
+ 1)) < O2NM_MAX_NODES
) {
523 static int dlm_exit_domain_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
526 struct dlm_ctxt
*dlm
= data
;
528 struct dlm_exit_domain
*exit_msg
= (struct dlm_exit_domain
*) msg
->buf
;
530 mlog_entry("%p %u %p", msg
, len
, data
);
535 node
= exit_msg
->node_idx
;
537 printk(KERN_INFO
"ocfs2_dlm: Node %u leaves domain %s\n", node
, dlm
->name
);
539 spin_lock(&dlm
->spinlock
);
540 clear_bit(node
, dlm
->domain_map
);
541 __dlm_print_nodes(dlm
);
543 /* notify anything attached to the heartbeat events */
544 dlm_hb_event_notify_attached(dlm
, node
, 0);
546 spin_unlock(&dlm
->spinlock
);
553 static int dlm_send_one_domain_exit(struct dlm_ctxt
*dlm
,
557 struct dlm_exit_domain leave_msg
;
559 mlog(0, "Asking node %u if we can leave the domain %s me = %u\n",
560 node
, dlm
->name
, dlm
->node_num
);
562 memset(&leave_msg
, 0, sizeof(leave_msg
));
563 leave_msg
.node_idx
= dlm
->node_num
;
565 status
= o2net_send_message(DLM_EXIT_DOMAIN_MSG
, dlm
->key
,
566 &leave_msg
, sizeof(leave_msg
), node
,
569 mlog(0, "status return %d from o2net_send_message\n", status
);
575 static void dlm_leave_domain(struct dlm_ctxt
*dlm
)
577 int node
, clear_node
, status
;
579 /* At this point we've migrated away all our locks and won't
580 * accept mastership of new ones. The dlm is responsible for
581 * almost nothing now. We make sure not to confuse any joining
582 * nodes and then commence shutdown procedure. */
584 spin_lock(&dlm
->spinlock
);
585 /* Clear ourselves from the domain map */
586 clear_bit(dlm
->node_num
, dlm
->domain_map
);
587 while ((node
= find_next_bit(dlm
->domain_map
, O2NM_MAX_NODES
,
588 0)) < O2NM_MAX_NODES
) {
589 /* Drop the dlm spinlock. This is safe wrt the domain_map.
590 * -nodes cannot be added now as the
591 * query_join_handlers knows to respond with OK_NO_MAP
592 * -we catch the right network errors if a node is
593 * removed from the map while we're sending him the
595 spin_unlock(&dlm
->spinlock
);
599 status
= dlm_send_one_domain_exit(dlm
, node
);
601 status
!= -ENOPROTOOPT
&&
602 status
!= -ENOTCONN
) {
603 mlog(ML_NOTICE
, "Error %d sending domain exit message "
604 "to node %d\n", status
, node
);
606 /* Not sure what to do here but lets sleep for
607 * a bit in case this was a transient
609 msleep(DLM_DOMAIN_BACKOFF_MS
);
613 spin_lock(&dlm
->spinlock
);
614 /* If we're not clearing the node bit then we intend
615 * to loop back around to try again. */
617 clear_bit(node
, dlm
->domain_map
);
619 spin_unlock(&dlm
->spinlock
);
622 int dlm_joined(struct dlm_ctxt
*dlm
)
626 spin_lock(&dlm_domain_lock
);
628 if (dlm
->dlm_state
== DLM_CTXT_JOINED
)
631 spin_unlock(&dlm_domain_lock
);
636 int dlm_shutting_down(struct dlm_ctxt
*dlm
)
640 spin_lock(&dlm_domain_lock
);
642 if (dlm
->dlm_state
== DLM_CTXT_IN_SHUTDOWN
)
645 spin_unlock(&dlm_domain_lock
);
650 void dlm_unregister_domain(struct dlm_ctxt
*dlm
)
653 struct dlm_lock_resource
*res
;
655 spin_lock(&dlm_domain_lock
);
656 BUG_ON(dlm
->dlm_state
!= DLM_CTXT_JOINED
);
657 BUG_ON(!dlm
->num_joins
);
660 if (!dlm
->num_joins
) {
661 /* We mark it "in shutdown" now so new register
662 * requests wait until we've completely left the
663 * domain. Don't use DLM_CTXT_LEAVING yet as we still
664 * want new domain joins to communicate with us at
665 * least until we've completed migration of our
667 dlm
->dlm_state
= DLM_CTXT_IN_SHUTDOWN
;
670 spin_unlock(&dlm_domain_lock
);
673 mlog(0, "shutting down domain %s\n", dlm
->name
);
675 /* We changed dlm state, notify the thread */
676 dlm_kick_thread(dlm
, NULL
);
678 while (dlm_migrate_all_locks(dlm
)) {
679 /* Give dlm_thread time to purge the lockres' */
681 mlog(0, "%s: more migration to do\n", dlm
->name
);
684 /* This list should be empty. If not, print remaining lockres */
685 if (!list_empty(&dlm
->tracking_list
)) {
686 mlog(ML_ERROR
, "Following lockres' are still on the "
688 list_for_each_entry(res
, &dlm
->tracking_list
, tracking
)
689 dlm_print_one_lock_resource(res
);
692 dlm_mark_domain_leaving(dlm
);
693 dlm_leave_domain(dlm
);
694 dlm_complete_dlm_shutdown(dlm
);
698 EXPORT_SYMBOL_GPL(dlm_unregister_domain
);
700 static int dlm_query_join_proto_check(char *proto_type
, int node
,
701 struct dlm_protocol_version
*ours
,
702 struct dlm_protocol_version
*request
)
705 struct dlm_protocol_version proto
= *request
;
707 if (!dlm_protocol_compare(ours
, &proto
)) {
709 "node %u wanted to join with %s locking protocol "
710 "%u.%u, we respond with %u.%u\n",
714 proto
.pv_major
, proto
.pv_minor
);
715 request
->pv_minor
= proto
.pv_minor
;
719 "Node %u wanted to join with %s locking "
720 "protocol %u.%u, but we have %u.%u, disallowing\n",
733 * struct dlm_query_join_packet is made up of four one-byte fields. They
734 * are effectively in big-endian order already. However, little-endian
735 * machines swap them before putting the packet on the wire (because
736 * query_join's response is a status, and that status is treated as a u32
737 * on the wire). Thus, a big-endian and little-endian machines will treat
738 * this structure differently.
740 * The solution is to have little-endian machines swap the structure when
741 * converting from the structure to the u32 representation. This will
742 * result in the structure having the correct format on the wire no matter
743 * the host endian format.
745 static void dlm_query_join_packet_to_wire(struct dlm_query_join_packet
*packet
,
748 union dlm_query_join_response response
;
750 response
.packet
= *packet
;
751 *wire
= cpu_to_be32(response
.intval
);
754 static void dlm_query_join_wire_to_packet(u32 wire
,
755 struct dlm_query_join_packet
*packet
)
757 union dlm_query_join_response response
;
759 response
.intval
= cpu_to_be32(wire
);
760 *packet
= response
.packet
;
763 static int dlm_query_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
766 struct dlm_query_join_request
*query
;
767 struct dlm_query_join_packet packet
= {
768 .code
= JOIN_DISALLOW
,
770 struct dlm_ctxt
*dlm
= NULL
;
774 query
= (struct dlm_query_join_request
*) msg
->buf
;
776 mlog(0, "node %u wants to join domain %s\n", query
->node_idx
,
780 * If heartbeat doesn't consider the node live, tell it
781 * to back off and try again. This gives heartbeat a chance
784 if (!o2hb_check_node_heartbeating(query
->node_idx
)) {
785 mlog(0, "node %u is not in our live map yet\n",
788 packet
.code
= JOIN_DISALLOW
;
792 packet
.code
= JOIN_OK_NO_MAP
;
794 spin_lock(&dlm_domain_lock
);
795 dlm
= __dlm_lookup_domain_full(query
->domain
, query
->name_len
);
800 * There is a small window where the joining node may not see the
801 * node(s) that just left but still part of the cluster. DISALLOW
802 * join request if joining node has different node map.
805 while (nodenum
< O2NM_MAX_NODES
) {
806 if (test_bit(nodenum
, dlm
->domain_map
)) {
807 if (!byte_test_bit(nodenum
, query
->node_map
)) {
808 mlog(0, "disallow join as node %u does not "
809 "have node %u in its nodemap\n",
810 query
->node_idx
, nodenum
);
811 packet
.code
= JOIN_DISALLOW
;
818 /* Once the dlm ctxt is marked as leaving then we don't want
819 * to be put in someone's domain map.
820 * Also, explicitly disallow joining at certain troublesome
821 * times (ie. during recovery). */
822 if (dlm
&& dlm
->dlm_state
!= DLM_CTXT_LEAVING
) {
823 int bit
= query
->node_idx
;
824 spin_lock(&dlm
->spinlock
);
826 if (dlm
->dlm_state
== DLM_CTXT_NEW
&&
827 dlm
->joining_node
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
828 /*If this is a brand new context and we
829 * haven't started our join process yet, then
830 * the other node won the race. */
831 packet
.code
= JOIN_OK_NO_MAP
;
832 } else if (dlm
->joining_node
!= DLM_LOCK_RES_OWNER_UNKNOWN
) {
833 /* Disallow parallel joins. */
834 packet
.code
= JOIN_DISALLOW
;
835 } else if (dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
) {
836 mlog(0, "node %u trying to join, but recovery "
837 "is ongoing.\n", bit
);
838 packet
.code
= JOIN_DISALLOW
;
839 } else if (test_bit(bit
, dlm
->recovery_map
)) {
840 mlog(0, "node %u trying to join, but it "
841 "still needs recovery.\n", bit
);
842 packet
.code
= JOIN_DISALLOW
;
843 } else if (test_bit(bit
, dlm
->domain_map
)) {
844 mlog(0, "node %u trying to join, but it "
845 "is still in the domain! needs recovery?\n",
847 packet
.code
= JOIN_DISALLOW
;
849 /* Alright we're fully a part of this domain
850 * so we keep some state as to who's joining
851 * and indicate to him that needs to be fixed
854 /* Make sure we speak compatible locking protocols. */
855 if (dlm_query_join_proto_check("DLM", bit
,
856 &dlm
->dlm_locking_proto
,
857 &query
->dlm_proto
)) {
858 packet
.code
= JOIN_PROTOCOL_MISMATCH
;
859 } else if (dlm_query_join_proto_check("fs", bit
,
860 &dlm
->fs_locking_proto
,
862 packet
.code
= JOIN_PROTOCOL_MISMATCH
;
864 packet
.dlm_minor
= query
->dlm_proto
.pv_minor
;
865 packet
.fs_minor
= query
->fs_proto
.pv_minor
;
866 packet
.code
= JOIN_OK
;
867 __dlm_set_joining_node(dlm
, query
->node_idx
);
871 spin_unlock(&dlm
->spinlock
);
874 spin_unlock(&dlm_domain_lock
);
877 mlog(0, "We respond with %u\n", packet
.code
);
879 dlm_query_join_packet_to_wire(&packet
, &response
);
883 static int dlm_assert_joined_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
886 struct dlm_assert_joined
*assert;
887 struct dlm_ctxt
*dlm
= NULL
;
889 assert = (struct dlm_assert_joined
*) msg
->buf
;
891 mlog(0, "node %u asserts join on domain %s\n", assert->node_idx
,
894 spin_lock(&dlm_domain_lock
);
895 dlm
= __dlm_lookup_domain_full(assert->domain
, assert->name_len
);
896 /* XXX should we consider no dlm ctxt an error? */
898 spin_lock(&dlm
->spinlock
);
900 /* Alright, this node has officially joined our
901 * domain. Set him in the map and clean up our
902 * leftover join state. */
903 BUG_ON(dlm
->joining_node
!= assert->node_idx
);
904 set_bit(assert->node_idx
, dlm
->domain_map
);
905 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
907 printk(KERN_INFO
"ocfs2_dlm: Node %u joins domain %s\n",
908 assert->node_idx
, dlm
->name
);
909 __dlm_print_nodes(dlm
);
911 /* notify anything attached to the heartbeat events */
912 dlm_hb_event_notify_attached(dlm
, assert->node_idx
, 1);
914 spin_unlock(&dlm
->spinlock
);
916 spin_unlock(&dlm_domain_lock
);
921 static int dlm_cancel_join_handler(struct o2net_msg
*msg
, u32 len
, void *data
,
924 struct dlm_cancel_join
*cancel
;
925 struct dlm_ctxt
*dlm
= NULL
;
927 cancel
= (struct dlm_cancel_join
*) msg
->buf
;
929 mlog(0, "node %u cancels join on domain %s\n", cancel
->node_idx
,
932 spin_lock(&dlm_domain_lock
);
933 dlm
= __dlm_lookup_domain_full(cancel
->domain
, cancel
->name_len
);
936 spin_lock(&dlm
->spinlock
);
938 /* Yikes, this guy wants to cancel his join. No
939 * problem, we simply cleanup our join state. */
940 BUG_ON(dlm
->joining_node
!= cancel
->node_idx
);
941 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
943 spin_unlock(&dlm
->spinlock
);
945 spin_unlock(&dlm_domain_lock
);
950 static int dlm_send_one_join_cancel(struct dlm_ctxt
*dlm
,
954 struct dlm_cancel_join cancel_msg
;
956 memset(&cancel_msg
, 0, sizeof(cancel_msg
));
957 cancel_msg
.node_idx
= dlm
->node_num
;
958 cancel_msg
.name_len
= strlen(dlm
->name
);
959 memcpy(cancel_msg
.domain
, dlm
->name
, cancel_msg
.name_len
);
961 status
= o2net_send_message(DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
962 &cancel_msg
, sizeof(cancel_msg
), node
,
973 /* map_size should be in bytes. */
974 static int dlm_send_join_cancels(struct dlm_ctxt
*dlm
,
975 unsigned long *node_map
,
976 unsigned int map_size
)
981 if (map_size
!= (BITS_TO_LONGS(O2NM_MAX_NODES
) *
982 sizeof(unsigned long))) {
984 "map_size %u != BITS_TO_LONGS(O2NM_MAX_NODES) %u\n",
985 map_size
, (unsigned)BITS_TO_LONGS(O2NM_MAX_NODES
));
991 while ((node
= find_next_bit(node_map
, O2NM_MAX_NODES
,
992 node
+ 1)) < O2NM_MAX_NODES
) {
993 if (node
== dlm
->node_num
)
996 tmpstat
= dlm_send_one_join_cancel(dlm
, node
);
998 mlog(ML_ERROR
, "Error return %d cancelling join on "
999 "node %d\n", tmpstat
, node
);
1010 static int dlm_request_join(struct dlm_ctxt
*dlm
,
1012 enum dlm_query_join_response_code
*response
)
1015 struct dlm_query_join_request join_msg
;
1016 struct dlm_query_join_packet packet
;
1019 mlog(0, "querying node %d\n", node
);
1021 memset(&join_msg
, 0, sizeof(join_msg
));
1022 join_msg
.node_idx
= dlm
->node_num
;
1023 join_msg
.name_len
= strlen(dlm
->name
);
1024 memcpy(join_msg
.domain
, dlm
->name
, join_msg
.name_len
);
1025 join_msg
.dlm_proto
= dlm
->dlm_locking_proto
;
1026 join_msg
.fs_proto
= dlm
->fs_locking_proto
;
1028 /* copy live node map to join message */
1029 byte_copymap(join_msg
.node_map
, dlm
->live_nodes_map
, O2NM_MAX_NODES
);
1031 status
= o2net_send_message(DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
, &join_msg
,
1032 sizeof(join_msg
), node
,
1034 if (status
< 0 && status
!= -ENOPROTOOPT
) {
1038 dlm_query_join_wire_to_packet(join_resp
, &packet
);
1040 /* -ENOPROTOOPT from the net code means the other side isn't
1041 listening for our message type -- that's fine, it means
1042 his dlm isn't up, so we can consider him a 'yes' but not
1043 joined into the domain. */
1044 if (status
== -ENOPROTOOPT
) {
1046 *response
= JOIN_OK_NO_MAP
;
1047 } else if (packet
.code
== JOIN_DISALLOW
||
1048 packet
.code
== JOIN_OK_NO_MAP
) {
1049 *response
= packet
.code
;
1050 } else if (packet
.code
== JOIN_PROTOCOL_MISMATCH
) {
1052 "This node requested DLM locking protocol %u.%u and "
1053 "filesystem locking protocol %u.%u. At least one of "
1054 "the protocol versions on node %d is not compatible, "
1056 dlm
->dlm_locking_proto
.pv_major
,
1057 dlm
->dlm_locking_proto
.pv_minor
,
1058 dlm
->fs_locking_proto
.pv_major
,
1059 dlm
->fs_locking_proto
.pv_minor
,
1062 *response
= packet
.code
;
1063 } else if (packet
.code
== JOIN_OK
) {
1064 *response
= packet
.code
;
1065 /* Use the same locking protocol as the remote node */
1066 dlm
->dlm_locking_proto
.pv_minor
= packet
.dlm_minor
;
1067 dlm
->fs_locking_proto
.pv_minor
= packet
.fs_minor
;
1069 "Node %d responds JOIN_OK with DLM locking protocol "
1070 "%u.%u and fs locking protocol %u.%u\n",
1072 dlm
->dlm_locking_proto
.pv_major
,
1073 dlm
->dlm_locking_proto
.pv_minor
,
1074 dlm
->fs_locking_proto
.pv_major
,
1075 dlm
->fs_locking_proto
.pv_minor
);
1078 mlog(ML_ERROR
, "invalid response %d from node %u\n",
1082 mlog(0, "status %d, node %d response is %d\n", status
, node
,
1089 static int dlm_send_one_join_assert(struct dlm_ctxt
*dlm
,
1093 struct dlm_assert_joined assert_msg
;
1095 mlog(0, "Sending join assert to node %u\n", node
);
1097 memset(&assert_msg
, 0, sizeof(assert_msg
));
1098 assert_msg
.node_idx
= dlm
->node_num
;
1099 assert_msg
.name_len
= strlen(dlm
->name
);
1100 memcpy(assert_msg
.domain
, dlm
->name
, assert_msg
.name_len
);
1102 status
= o2net_send_message(DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
1103 &assert_msg
, sizeof(assert_msg
), node
,
1111 static void dlm_send_join_asserts(struct dlm_ctxt
*dlm
,
1112 unsigned long *node_map
)
1114 int status
, node
, live
;
1118 while ((node
= find_next_bit(node_map
, O2NM_MAX_NODES
,
1119 node
+ 1)) < O2NM_MAX_NODES
) {
1120 if (node
== dlm
->node_num
)
1124 /* It is very important that this message be
1125 * received so we spin until either the node
1126 * has died or it gets the message. */
1127 status
= dlm_send_one_join_assert(dlm
, node
);
1129 spin_lock(&dlm
->spinlock
);
1130 live
= test_bit(node
, dlm
->live_nodes_map
);
1131 spin_unlock(&dlm
->spinlock
);
1134 mlog(ML_ERROR
, "Error return %d asserting "
1135 "join on node %d\n", status
, node
);
1137 /* give us some time between errors... */
1139 msleep(DLM_DOMAIN_BACKOFF_MS
);
1141 } while (status
&& live
);
1145 struct domain_join_ctxt
{
1146 unsigned long live_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1147 unsigned long yes_resp_map
[BITS_TO_LONGS(O2NM_MAX_NODES
)];
1150 static int dlm_should_restart_join(struct dlm_ctxt
*dlm
,
1151 struct domain_join_ctxt
*ctxt
,
1152 enum dlm_query_join_response_code response
)
1156 if (response
== JOIN_DISALLOW
) {
1157 mlog(0, "Latest response of disallow -- should restart\n");
1161 spin_lock(&dlm
->spinlock
);
1162 /* For now, we restart the process if the node maps have
1164 ret
= memcmp(ctxt
->live_map
, dlm
->live_nodes_map
,
1165 sizeof(dlm
->live_nodes_map
));
1166 spin_unlock(&dlm
->spinlock
);
1169 mlog(0, "Node maps changed -- should restart\n");
1174 static int dlm_try_to_join_domain(struct dlm_ctxt
*dlm
)
1176 int status
= 0, tmpstat
, node
;
1177 struct domain_join_ctxt
*ctxt
;
1178 enum dlm_query_join_response_code response
= JOIN_DISALLOW
;
1180 mlog_entry("%p", dlm
);
1182 ctxt
= kzalloc(sizeof(*ctxt
), GFP_KERNEL
);
1189 /* group sem locking should work for us here -- we're already
1190 * registered for heartbeat events so filling this should be
1191 * atomic wrt getting those handlers called. */
1192 o2hb_fill_node_map(dlm
->live_nodes_map
, sizeof(dlm
->live_nodes_map
));
1194 spin_lock(&dlm
->spinlock
);
1195 memcpy(ctxt
->live_map
, dlm
->live_nodes_map
, sizeof(ctxt
->live_map
));
1197 __dlm_set_joining_node(dlm
, dlm
->node_num
);
1199 spin_unlock(&dlm
->spinlock
);
1202 while ((node
= find_next_bit(ctxt
->live_map
, O2NM_MAX_NODES
,
1203 node
+ 1)) < O2NM_MAX_NODES
) {
1204 if (node
== dlm
->node_num
)
1207 status
= dlm_request_join(dlm
, node
, &response
);
1213 /* Ok, either we got a response or the node doesn't have a
1215 if (response
== JOIN_OK
)
1216 set_bit(node
, ctxt
->yes_resp_map
);
1218 if (dlm_should_restart_join(dlm
, ctxt
, response
)) {
1224 mlog(0, "Yay, done querying nodes!\n");
1226 /* Yay, everyone agree's we can join the domain. My domain is
1227 * comprised of all nodes who were put in the
1228 * yes_resp_map. Copy that into our domain map and send a join
1229 * assert message to clean up everyone elses state. */
1230 spin_lock(&dlm
->spinlock
);
1231 memcpy(dlm
->domain_map
, ctxt
->yes_resp_map
,
1232 sizeof(ctxt
->yes_resp_map
));
1233 set_bit(dlm
->node_num
, dlm
->domain_map
);
1234 spin_unlock(&dlm
->spinlock
);
1236 dlm_send_join_asserts(dlm
, ctxt
->yes_resp_map
);
1238 /* Joined state *must* be set before the joining node
1239 * information, otherwise the query_join handler may read no
1240 * current joiner but a state of NEW and tell joining nodes
1241 * we're not in the domain. */
1242 spin_lock(&dlm_domain_lock
);
1243 dlm
->dlm_state
= DLM_CTXT_JOINED
;
1245 spin_unlock(&dlm_domain_lock
);
1248 spin_lock(&dlm
->spinlock
);
1249 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
1251 __dlm_print_nodes(dlm
);
1252 spin_unlock(&dlm
->spinlock
);
1255 /* Do we need to send a cancel message to any nodes? */
1257 tmpstat
= dlm_send_join_cancels(dlm
,
1259 sizeof(ctxt
->yes_resp_map
));
1261 mlog_errno(tmpstat
);
1266 mlog(0, "returning %d\n", status
);
1270 static void dlm_unregister_domain_handlers(struct dlm_ctxt
*dlm
)
1272 o2hb_unregister_callback(NULL
, &dlm
->dlm_hb_up
);
1273 o2hb_unregister_callback(NULL
, &dlm
->dlm_hb_down
);
1274 o2net_unregister_handler_list(&dlm
->dlm_domain_handlers
);
1277 static int dlm_register_domain_handlers(struct dlm_ctxt
*dlm
)
1281 mlog(0, "registering handlers.\n");
1283 o2hb_setup_callback(&dlm
->dlm_hb_down
, O2HB_NODE_DOWN_CB
,
1284 dlm_hb_node_down_cb
, dlm
, DLM_HB_NODE_DOWN_PRI
);
1285 status
= o2hb_register_callback(NULL
, &dlm
->dlm_hb_down
);
1289 o2hb_setup_callback(&dlm
->dlm_hb_up
, O2HB_NODE_UP_CB
,
1290 dlm_hb_node_up_cb
, dlm
, DLM_HB_NODE_UP_PRI
);
1291 status
= o2hb_register_callback(NULL
, &dlm
->dlm_hb_up
);
1295 status
= o2net_register_handler(DLM_MASTER_REQUEST_MSG
, dlm
->key
,
1296 sizeof(struct dlm_master_request
),
1297 dlm_master_request_handler
,
1298 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1302 status
= o2net_register_handler(DLM_ASSERT_MASTER_MSG
, dlm
->key
,
1303 sizeof(struct dlm_assert_master
),
1304 dlm_assert_master_handler
,
1305 dlm
, dlm_assert_master_post_handler
,
1306 &dlm
->dlm_domain_handlers
);
1310 status
= o2net_register_handler(DLM_CREATE_LOCK_MSG
, dlm
->key
,
1311 sizeof(struct dlm_create_lock
),
1312 dlm_create_lock_handler
,
1313 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1317 status
= o2net_register_handler(DLM_CONVERT_LOCK_MSG
, dlm
->key
,
1318 DLM_CONVERT_LOCK_MAX_LEN
,
1319 dlm_convert_lock_handler
,
1320 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1324 status
= o2net_register_handler(DLM_UNLOCK_LOCK_MSG
, dlm
->key
,
1325 DLM_UNLOCK_LOCK_MAX_LEN
,
1326 dlm_unlock_lock_handler
,
1327 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1331 status
= o2net_register_handler(DLM_PROXY_AST_MSG
, dlm
->key
,
1332 DLM_PROXY_AST_MAX_LEN
,
1333 dlm_proxy_ast_handler
,
1334 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1338 status
= o2net_register_handler(DLM_EXIT_DOMAIN_MSG
, dlm
->key
,
1339 sizeof(struct dlm_exit_domain
),
1340 dlm_exit_domain_handler
,
1341 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1345 status
= o2net_register_handler(DLM_DEREF_LOCKRES_MSG
, dlm
->key
,
1346 sizeof(struct dlm_deref_lockres
),
1347 dlm_deref_lockres_handler
,
1348 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1352 status
= o2net_register_handler(DLM_MIGRATE_REQUEST_MSG
, dlm
->key
,
1353 sizeof(struct dlm_migrate_request
),
1354 dlm_migrate_request_handler
,
1355 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1359 status
= o2net_register_handler(DLM_MIG_LOCKRES_MSG
, dlm
->key
,
1360 DLM_MIG_LOCKRES_MAX_LEN
,
1361 dlm_mig_lockres_handler
,
1362 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1366 status
= o2net_register_handler(DLM_MASTER_REQUERY_MSG
, dlm
->key
,
1367 sizeof(struct dlm_master_requery
),
1368 dlm_master_requery_handler
,
1369 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1373 status
= o2net_register_handler(DLM_LOCK_REQUEST_MSG
, dlm
->key
,
1374 sizeof(struct dlm_lock_request
),
1375 dlm_request_all_locks_handler
,
1376 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1380 status
= o2net_register_handler(DLM_RECO_DATA_DONE_MSG
, dlm
->key
,
1381 sizeof(struct dlm_reco_data_done
),
1382 dlm_reco_data_done_handler
,
1383 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1387 status
= o2net_register_handler(DLM_BEGIN_RECO_MSG
, dlm
->key
,
1388 sizeof(struct dlm_begin_reco
),
1389 dlm_begin_reco_handler
,
1390 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1394 status
= o2net_register_handler(DLM_FINALIZE_RECO_MSG
, dlm
->key
,
1395 sizeof(struct dlm_finalize_reco
),
1396 dlm_finalize_reco_handler
,
1397 dlm
, NULL
, &dlm
->dlm_domain_handlers
);
1403 dlm_unregister_domain_handlers(dlm
);
1408 static int dlm_join_domain(struct dlm_ctxt
*dlm
)
1411 unsigned int backoff
;
1412 unsigned int total_backoff
= 0;
1416 mlog(0, "Join domain %s\n", dlm
->name
);
1418 status
= dlm_register_domain_handlers(dlm
);
1424 status
= dlm_debug_init(dlm
);
1430 status
= dlm_launch_thread(dlm
);
1436 status
= dlm_launch_recovery_thread(dlm
);
1442 dlm
->dlm_worker
= create_singlethread_workqueue("dlm_wq");
1443 if (!dlm
->dlm_worker
) {
1450 status
= dlm_try_to_join_domain(dlm
);
1452 /* If we're racing another node to the join, then we
1453 * need to back off temporarily and let them
1455 #define DLM_JOIN_TIMEOUT_MSECS 90000
1456 if (status
== -EAGAIN
) {
1457 if (signal_pending(current
)) {
1458 status
= -ERESTARTSYS
;
1463 msecs_to_jiffies(DLM_JOIN_TIMEOUT_MSECS
)) {
1464 status
= -ERESTARTSYS
;
1465 mlog(ML_NOTICE
, "Timed out joining dlm domain "
1466 "%s after %u msecs\n", dlm
->name
,
1467 jiffies_to_msecs(total_backoff
));
1473 * <dale> No, after you!
1475 * <dale> But you first!
1478 backoff
= (unsigned int)(jiffies
& 0x3);
1479 backoff
*= DLM_DOMAIN_BACKOFF_MS
;
1480 total_backoff
+= backoff
;
1481 mlog(0, "backoff %d\n", backoff
);
1484 } while (status
== -EAGAIN
);
1493 wake_up(&dlm_domain_events
);
1496 dlm_unregister_domain_handlers(dlm
);
1497 dlm_debug_shutdown(dlm
);
1498 dlm_complete_thread(dlm
);
1499 dlm_complete_recovery_thread(dlm
);
1500 dlm_destroy_dlm_worker(dlm
);
1506 static struct dlm_ctxt
*dlm_alloc_ctxt(const char *domain
,
1511 struct dlm_ctxt
*dlm
= NULL
;
1513 dlm
= kzalloc(sizeof(*dlm
), GFP_KERNEL
);
1515 mlog_errno(-ENOMEM
);
1519 dlm
->name
= kmalloc(strlen(domain
) + 1, GFP_KERNEL
);
1520 if (dlm
->name
== NULL
) {
1521 mlog_errno(-ENOMEM
);
1527 dlm
->lockres_hash
= (struct hlist_head
**)dlm_alloc_pagevec(DLM_HASH_PAGES
);
1528 if (!dlm
->lockres_hash
) {
1529 mlog_errno(-ENOMEM
);
1536 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++)
1537 INIT_HLIST_HEAD(dlm_lockres_hash(dlm
, i
));
1539 dlm
->master_hash
= (struct hlist_head
**)
1540 dlm_alloc_pagevec(DLM_HASH_PAGES
);
1541 if (!dlm
->master_hash
) {
1542 mlog_errno(-ENOMEM
);
1543 dlm_free_pagevec((void **)dlm
->lockres_hash
, DLM_HASH_PAGES
);
1550 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++)
1551 INIT_HLIST_HEAD(dlm_master_hash(dlm
, i
));
1553 strcpy(dlm
->name
, domain
);
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
)) {
1707 "Requested locking protocol version is not "
1708 "compatible with already registered domain "
1709 "\"%s\"\n", domain
);
1717 spin_unlock(&dlm_domain_lock
);
1725 spin_unlock(&dlm_domain_lock
);
1727 new_ctxt
= dlm_alloc_ctxt(domain
, key
);
1736 /* a little variable switch-a-roo here... */
1740 /* add the new domain */
1741 list_add_tail(&dlm
->list
, &dlm_domains
);
1742 spin_unlock(&dlm_domain_lock
);
1745 * Pass the locking protocol version into the join. If the join
1746 * succeeds, it will have the negotiated protocol set.
1748 dlm
->dlm_locking_proto
= dlm_protocol
;
1749 dlm
->fs_locking_proto
= *fs_proto
;
1751 ret
= dlm_join_domain(dlm
);
1758 /* Tell the caller what locking protocol we negotiated */
1759 *fs_proto
= dlm
->fs_locking_proto
;
1764 dlm_free_ctxt_mem(new_ctxt
);
1771 EXPORT_SYMBOL_GPL(dlm_register_domain
);
1773 static LIST_HEAD(dlm_join_handlers
);
1775 static void dlm_unregister_net_handlers(void)
1777 o2net_unregister_handler_list(&dlm_join_handlers
);
1780 static int dlm_register_net_handlers(void)
1784 status
= o2net_register_handler(DLM_QUERY_JOIN_MSG
, DLM_MOD_KEY
,
1785 sizeof(struct dlm_query_join_request
),
1786 dlm_query_join_handler
,
1787 NULL
, NULL
, &dlm_join_handlers
);
1791 status
= o2net_register_handler(DLM_ASSERT_JOINED_MSG
, DLM_MOD_KEY
,
1792 sizeof(struct dlm_assert_joined
),
1793 dlm_assert_joined_handler
,
1794 NULL
, NULL
, &dlm_join_handlers
);
1798 status
= o2net_register_handler(DLM_CANCEL_JOIN_MSG
, DLM_MOD_KEY
,
1799 sizeof(struct dlm_cancel_join
),
1800 dlm_cancel_join_handler
,
1801 NULL
, NULL
, &dlm_join_handlers
);
1805 dlm_unregister_net_handlers();
1810 /* Domain eviction callback handling.
1812 * The file system requires notification of node death *before* the
1813 * dlm completes it's recovery work, otherwise it may be able to
1814 * acquire locks on resources requiring recovery. Since the dlm can
1815 * evict a node from it's domain *before* heartbeat fires, a similar
1816 * mechanism is required. */
1818 /* Eviction is not expected to happen often, so a per-domain lock is
1819 * not necessary. Eviction callbacks are allowed to sleep for short
1820 * periods of time. */
1821 static DECLARE_RWSEM(dlm_callback_sem
);
1823 void dlm_fire_domain_eviction_callbacks(struct dlm_ctxt
*dlm
,
1826 struct list_head
*iter
;
1827 struct dlm_eviction_cb
*cb
;
1829 down_read(&dlm_callback_sem
);
1830 list_for_each(iter
, &dlm
->dlm_eviction_callbacks
) {
1831 cb
= list_entry(iter
, struct dlm_eviction_cb
, ec_item
);
1833 cb
->ec_func(node_num
, cb
->ec_data
);
1835 up_read(&dlm_callback_sem
);
1838 void dlm_setup_eviction_cb(struct dlm_eviction_cb
*cb
,
1839 dlm_eviction_func
*f
,
1842 INIT_LIST_HEAD(&cb
->ec_item
);
1846 EXPORT_SYMBOL_GPL(dlm_setup_eviction_cb
);
1848 void dlm_register_eviction_cb(struct dlm_ctxt
*dlm
,
1849 struct dlm_eviction_cb
*cb
)
1851 down_write(&dlm_callback_sem
);
1852 list_add_tail(&cb
->ec_item
, &dlm
->dlm_eviction_callbacks
);
1853 up_write(&dlm_callback_sem
);
1855 EXPORT_SYMBOL_GPL(dlm_register_eviction_cb
);
1857 void dlm_unregister_eviction_cb(struct dlm_eviction_cb
*cb
)
1859 down_write(&dlm_callback_sem
);
1860 list_del_init(&cb
->ec_item
);
1861 up_write(&dlm_callback_sem
);
1863 EXPORT_SYMBOL_GPL(dlm_unregister_eviction_cb
);
1865 static int __init
dlm_init(void)
1869 dlm_print_version();
1871 status
= dlm_init_mle_cache();
1873 mlog(ML_ERROR
, "Could not create o2dlm_mle slabcache\n");
1877 status
= dlm_init_master_caches();
1879 mlog(ML_ERROR
, "Could not create o2dlm_lockres and "
1880 "o2dlm_lockname slabcaches\n");
1884 status
= dlm_init_lock_cache();
1886 mlog(ML_ERROR
, "Count not create o2dlm_lock slabcache\n");
1890 status
= dlm_register_net_handlers();
1892 mlog(ML_ERROR
, "Unable to register network handlers\n");
1896 status
= dlm_create_debugfs_root();
1902 dlm_unregister_net_handlers();
1903 dlm_destroy_lock_cache();
1904 dlm_destroy_master_caches();
1905 dlm_destroy_mle_cache();
1909 static void __exit
dlm_exit (void)
1911 dlm_destroy_debugfs_root();
1912 dlm_unregister_net_handlers();
1913 dlm_destroy_lock_cache();
1914 dlm_destroy_master_caches();
1915 dlm_destroy_mle_cache();
1918 MODULE_AUTHOR("Oracle");
1919 MODULE_LICENSE("GPL");
1921 module_init(dlm_init
);
1922 module_exit(dlm_exit
);