1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
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.
28 #include <linux/module.h>
30 #include <linux/types.h>
31 #include <linux/slab.h>
32 #include <linux/highmem.h>
33 #include <linux/utsname.h>
34 #include <linux/init.h>
35 #include <linux/sysctl.h>
36 #include <linux/random.h>
37 #include <linux/blkdev.h>
38 #include <linux/socket.h>
39 #include <linux/inet.h>
40 #include <linux/timer.h>
41 #include <linux/kthread.h>
42 #include <linux/delay.h>
45 #include "cluster/heartbeat.h"
46 #include "cluster/nodemanager.h"
47 #include "cluster/tcp.h"
50 #include "dlmcommon.h"
51 #include "dlmdomain.h"
53 #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY)
54 #include "cluster/masklog.h"
56 static void dlm_do_local_recovery_cleanup(struct dlm_ctxt
*dlm
, u8 dead_node
);
58 static int dlm_recovery_thread(void *data
);
59 void dlm_complete_recovery_thread(struct dlm_ctxt
*dlm
);
60 int dlm_launch_recovery_thread(struct dlm_ctxt
*dlm
);
61 void dlm_kick_recovery_thread(struct dlm_ctxt
*dlm
);
62 static int dlm_do_recovery(struct dlm_ctxt
*dlm
);
64 static int dlm_pick_recovery_master(struct dlm_ctxt
*dlm
);
65 static int dlm_remaster_locks(struct dlm_ctxt
*dlm
, u8 dead_node
);
66 static int dlm_init_recovery_area(struct dlm_ctxt
*dlm
, u8 dead_node
);
67 static int dlm_request_all_locks(struct dlm_ctxt
*dlm
,
68 u8 request_from
, u8 dead_node
);
69 static void dlm_destroy_recovery_area(struct dlm_ctxt
*dlm
, u8 dead_node
);
71 static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource
*res
);
72 static void dlm_init_migratable_lockres(struct dlm_migratable_lockres
*mres
,
73 const char *lockname
, int namelen
,
74 int total_locks
, u64 cookie
,
76 static int dlm_send_mig_lockres_msg(struct dlm_ctxt
*dlm
,
77 struct dlm_migratable_lockres
*mres
,
79 struct dlm_lock_resource
*res
,
81 static int dlm_process_recovery_data(struct dlm_ctxt
*dlm
,
82 struct dlm_lock_resource
*res
,
83 struct dlm_migratable_lockres
*mres
);
84 static int dlm_send_finalize_reco_message(struct dlm_ctxt
*dlm
);
85 static int dlm_send_all_done_msg(struct dlm_ctxt
*dlm
,
86 u8 dead_node
, u8 send_to
);
87 static int dlm_send_begin_reco_message(struct dlm_ctxt
*dlm
, u8 dead_node
);
88 static void dlm_move_reco_locks_to_list(struct dlm_ctxt
*dlm
,
89 struct list_head
*list
, u8 dead_node
);
90 static void dlm_finish_local_lockres_recovery(struct dlm_ctxt
*dlm
,
91 u8 dead_node
, u8 new_master
);
92 static void dlm_reco_ast(void *astdata
);
93 static void dlm_reco_bast(void *astdata
, int blocked_type
);
94 static void dlm_reco_unlock_ast(void *astdata
, enum dlm_status st
);
95 static void dlm_request_all_locks_worker(struct dlm_work_item
*item
,
97 static void dlm_mig_lockres_worker(struct dlm_work_item
*item
, void *data
);
99 static u64
dlm_get_next_mig_cookie(void);
101 static spinlock_t dlm_reco_state_lock
= SPIN_LOCK_UNLOCKED
;
102 static spinlock_t dlm_mig_cookie_lock
= SPIN_LOCK_UNLOCKED
;
103 static u64 dlm_mig_cookie
= 1;
105 static u64
dlm_get_next_mig_cookie(void)
108 spin_lock(&dlm_mig_cookie_lock
);
110 if (dlm_mig_cookie
== (~0ULL))
114 spin_unlock(&dlm_mig_cookie_lock
);
118 static inline void dlm_set_reco_dead_node(struct dlm_ctxt
*dlm
,
121 assert_spin_locked(&dlm
->spinlock
);
122 if (dlm
->reco
.dead_node
!= dead_node
)
123 mlog(0, "%s: changing dead_node from %u to %u\n",
124 dlm
->name
, dlm
->reco
.dead_node
, dead_node
);
125 dlm
->reco
.dead_node
= dead_node
;
128 static inline void dlm_set_reco_master(struct dlm_ctxt
*dlm
,
131 assert_spin_locked(&dlm
->spinlock
);
132 mlog(0, "%s: changing new_master from %u to %u\n",
133 dlm
->name
, dlm
->reco
.new_master
, master
);
134 dlm
->reco
.new_master
= master
;
137 static inline void dlm_reset_recovery(struct dlm_ctxt
*dlm
)
139 spin_lock(&dlm
->spinlock
);
140 clear_bit(dlm
->reco
.dead_node
, dlm
->recovery_map
);
141 dlm_set_reco_dead_node(dlm
, O2NM_INVALID_NODE_NUM
);
142 dlm_set_reco_master(dlm
, O2NM_INVALID_NODE_NUM
);
143 spin_unlock(&dlm
->spinlock
);
146 /* Worker function used during recovery. */
147 void dlm_dispatch_work(void *data
)
149 struct dlm_ctxt
*dlm
= (struct dlm_ctxt
*)data
;
151 struct list_head
*iter
, *iter2
;
152 struct dlm_work_item
*item
;
153 dlm_workfunc_t
*workfunc
;
155 spin_lock(&dlm
->work_lock
);
156 list_splice_init(&dlm
->work_list
, &tmp_list
);
157 spin_unlock(&dlm
->work_lock
);
159 list_for_each_safe(iter
, iter2
, &tmp_list
) {
160 item
= list_entry(iter
, struct dlm_work_item
, list
);
161 workfunc
= item
->func
;
162 list_del_init(&item
->list
);
164 /* already have ref on dlm to avoid having
165 * it disappear. just double-check. */
166 BUG_ON(item
->dlm
!= dlm
);
168 /* this is allowed to sleep and
169 * call network stuff */
170 workfunc(item
, item
->data
);
181 void dlm_kick_recovery_thread(struct dlm_ctxt
*dlm
)
183 /* wake the recovery thread
184 * this will wake the reco thread in one of three places
185 * 1) sleeping with no recovery happening
186 * 2) sleeping with recovery mastered elsewhere
187 * 3) recovery mastered here, waiting on reco data */
189 wake_up(&dlm
->dlm_reco_thread_wq
);
192 /* Launch the recovery thread */
193 int dlm_launch_recovery_thread(struct dlm_ctxt
*dlm
)
195 mlog(0, "starting dlm recovery thread...\n");
197 dlm
->dlm_reco_thread_task
= kthread_run(dlm_recovery_thread
, dlm
,
199 if (IS_ERR(dlm
->dlm_reco_thread_task
)) {
200 mlog_errno(PTR_ERR(dlm
->dlm_reco_thread_task
));
201 dlm
->dlm_reco_thread_task
= NULL
;
208 void dlm_complete_recovery_thread(struct dlm_ctxt
*dlm
)
210 if (dlm
->dlm_reco_thread_task
) {
211 mlog(0, "waiting for dlm recovery thread to exit\n");
212 kthread_stop(dlm
->dlm_reco_thread_task
);
213 dlm
->dlm_reco_thread_task
= NULL
;
220 * this is lame, but here's how recovery works...
221 * 1) all recovery threads cluster wide will work on recovering
223 * 2) negotiate who will take over all the locks for the dead node.
224 * thats right... ALL the locks.
225 * 3) once a new master is chosen, everyone scans all locks
226 * and moves aside those mastered by the dead guy
227 * 4) each of these locks should be locked until recovery is done
228 * 5) the new master collects up all of secondary lock queue info
229 * one lock at a time, forcing each node to communicate back
231 * 6) each secondary lock queue responds with the full known lock info
232 * 7) once the new master has run all its locks, it sends a ALLDONE!
233 * message to everyone
234 * 8) upon receiving this message, the secondary queue node unlocks
235 * and responds to the ALLDONE
236 * 9) once the new master gets responses from everyone, he unlocks
237 * everything and recovery for this dead node is done
238 *10) go back to 2) while there are still dead nodes
242 static void dlm_print_reco_node_status(struct dlm_ctxt
*dlm
)
244 struct dlm_reco_node_data
*ndata
;
245 struct dlm_lock_resource
*res
;
247 mlog(ML_NOTICE
, "%s(%d): recovery info, state=%s, dead=%u, master=%u\n",
248 dlm
->name
, dlm
->dlm_reco_thread_task
->pid
,
249 dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
? "ACTIVE" : "inactive",
250 dlm
->reco
.dead_node
, dlm
->reco
.new_master
);
252 list_for_each_entry(ndata
, &dlm
->reco
.node_data
, list
) {
253 char *st
= "unknown";
254 switch (ndata
->state
) {
255 case DLM_RECO_NODE_DATA_INIT
:
258 case DLM_RECO_NODE_DATA_REQUESTING
:
261 case DLM_RECO_NODE_DATA_DEAD
:
264 case DLM_RECO_NODE_DATA_RECEIVING
:
267 case DLM_RECO_NODE_DATA_REQUESTED
:
270 case DLM_RECO_NODE_DATA_DONE
:
273 case DLM_RECO_NODE_DATA_FINALIZE_SENT
:
274 st
= "finalize-sent";
280 mlog(ML_NOTICE
, "%s: reco state, node %u, state=%s\n",
281 dlm
->name
, ndata
->node_num
, st
);
283 list_for_each_entry(res
, &dlm
->reco
.resources
, recovering
) {
284 mlog(ML_NOTICE
, "%s: lockres %.*s on recovering list\n",
285 dlm
->name
, res
->lockname
.len
, res
->lockname
.name
);
289 #define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000)
291 static int dlm_recovery_thread(void *data
)
294 struct dlm_ctxt
*dlm
= data
;
295 unsigned long timeout
= msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS
);
297 mlog(0, "dlm thread running for %s...\n", dlm
->name
);
299 while (!kthread_should_stop()) {
300 if (dlm_joined(dlm
)) {
301 status
= dlm_do_recovery(dlm
);
302 if (status
== -EAGAIN
) {
303 /* do not sleep, recheck immediately. */
310 wait_event_interruptible_timeout(dlm
->dlm_reco_thread_wq
,
311 kthread_should_stop(),
315 mlog(0, "quitting DLM recovery thread\n");
319 /* returns true when the recovery master has contacted us */
320 static int dlm_reco_master_ready(struct dlm_ctxt
*dlm
)
323 spin_lock(&dlm
->spinlock
);
324 ready
= (dlm
->reco
.new_master
!= O2NM_INVALID_NODE_NUM
);
325 spin_unlock(&dlm
->spinlock
);
329 /* returns true if node is no longer in the domain
330 * could be dead or just not joined */
331 int dlm_is_node_dead(struct dlm_ctxt
*dlm
, u8 node
)
334 spin_lock(&dlm
->spinlock
);
335 dead
= !test_bit(node
, dlm
->domain_map
);
336 spin_unlock(&dlm
->spinlock
);
340 int dlm_wait_for_node_death(struct dlm_ctxt
*dlm
, u8 node
, int timeout
)
343 mlog(ML_NOTICE
, "%s: waiting %dms for notification of "
344 "death of node %u\n", dlm
->name
, timeout
, node
);
345 wait_event_timeout(dlm
->dlm_reco_thread_wq
,
346 dlm_is_node_dead(dlm
, node
),
347 msecs_to_jiffies(timeout
));
349 mlog(ML_NOTICE
, "%s: waiting indefinitely for notification "
350 "of death of node %u\n", dlm
->name
, node
);
351 wait_event(dlm
->dlm_reco_thread_wq
,
352 dlm_is_node_dead(dlm
, node
));
354 /* for now, return 0 */
358 /* callers of the top-level api calls (dlmlock/dlmunlock) should
359 * block on the dlm->reco.event when recovery is in progress.
360 * the dlm recovery thread will set this state when it begins
361 * recovering a dead node (as the new master or not) and clear
362 * the state and wake as soon as all affected lock resources have
363 * been marked with the RECOVERY flag */
364 static int dlm_in_recovery(struct dlm_ctxt
*dlm
)
367 spin_lock(&dlm
->spinlock
);
368 in_recovery
= !!(dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
);
369 spin_unlock(&dlm
->spinlock
);
374 void dlm_wait_for_recovery(struct dlm_ctxt
*dlm
)
376 wait_event(dlm
->reco
.event
, !dlm_in_recovery(dlm
));
379 static void dlm_begin_recovery(struct dlm_ctxt
*dlm
)
381 spin_lock(&dlm
->spinlock
);
382 BUG_ON(dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
);
383 dlm
->reco
.state
|= DLM_RECO_STATE_ACTIVE
;
384 spin_unlock(&dlm
->spinlock
);
387 static void dlm_end_recovery(struct dlm_ctxt
*dlm
)
389 spin_lock(&dlm
->spinlock
);
390 BUG_ON(!(dlm
->reco
.state
& DLM_RECO_STATE_ACTIVE
));
391 dlm
->reco
.state
&= ~DLM_RECO_STATE_ACTIVE
;
392 spin_unlock(&dlm
->spinlock
);
393 wake_up(&dlm
->reco
.event
);
396 static int dlm_do_recovery(struct dlm_ctxt
*dlm
)
401 spin_lock(&dlm
->spinlock
);
403 /* check to see if the new master has died */
404 if (dlm
->reco
.new_master
!= O2NM_INVALID_NODE_NUM
&&
405 test_bit(dlm
->reco
.new_master
, dlm
->recovery_map
)) {
406 mlog(0, "new master %u died while recovering %u!\n",
407 dlm
->reco
.new_master
, dlm
->reco
.dead_node
);
408 /* unset the new_master, leave dead_node */
409 dlm_set_reco_master(dlm
, O2NM_INVALID_NODE_NUM
);
412 /* select a target to recover */
413 if (dlm
->reco
.dead_node
== O2NM_INVALID_NODE_NUM
) {
416 bit
= find_next_bit (dlm
->recovery_map
, O2NM_MAX_NODES
+1, 0);
417 if (bit
>= O2NM_MAX_NODES
|| bit
< 0)
418 dlm_set_reco_dead_node(dlm
, O2NM_INVALID_NODE_NUM
);
420 dlm_set_reco_dead_node(dlm
, bit
);
421 } else if (!test_bit(dlm
->reco
.dead_node
, dlm
->recovery_map
)) {
423 mlog(ML_ERROR
, "dead_node %u no longer in recovery map!\n",
424 dlm
->reco
.dead_node
);
425 dlm_set_reco_dead_node(dlm
, O2NM_INVALID_NODE_NUM
);
428 if (dlm
->reco
.dead_node
== O2NM_INVALID_NODE_NUM
) {
429 // mlog(0, "nothing to recover! sleeping now!\n");
430 spin_unlock(&dlm
->spinlock
);
431 /* return to main thread loop and sleep. */
434 mlog(0, "%s(%d):recovery thread found node %u in the recovery map!\n",
435 dlm
->name
, dlm
->dlm_reco_thread_task
->pid
,
436 dlm
->reco
.dead_node
);
437 spin_unlock(&dlm
->spinlock
);
439 /* take write barrier */
440 /* (stops the list reshuffling thread, proxy ast handling) */
441 dlm_begin_recovery(dlm
);
443 if (dlm
->reco
.new_master
== dlm
->node_num
)
446 if (dlm
->reco
.new_master
== O2NM_INVALID_NODE_NUM
) {
447 /* choose a new master, returns 0 if this node
448 * is the master, -EEXIST if it's another node.
449 * this does not return until a new master is chosen
450 * or recovery completes entirely. */
451 ret
= dlm_pick_recovery_master(dlm
);
453 /* already notified everyone. go. */
456 mlog(0, "another node will master this recovery session.\n");
458 mlog(0, "dlm=%s (%d), new_master=%u, this node=%u, dead_node=%u\n",
459 dlm
->name
, dlm
->dlm_reco_thread_task
->pid
, dlm
->reco
.new_master
,
460 dlm
->node_num
, dlm
->reco
.dead_node
);
462 /* it is safe to start everything back up here
463 * because all of the dead node's lock resources
464 * have been marked as in-recovery */
465 dlm_end_recovery(dlm
);
467 /* sleep out in main dlm_recovery_thread loop. */
471 mlog(0, "(%d) mastering recovery of %s:%u here(this=%u)!\n",
472 dlm
->dlm_reco_thread_task
->pid
,
473 dlm
->name
, dlm
->reco
.dead_node
, dlm
->node_num
);
475 status
= dlm_remaster_locks(dlm
, dlm
->reco
.dead_node
);
477 mlog(ML_ERROR
, "error %d remastering locks for node %u, "
478 "retrying.\n", status
, dlm
->reco
.dead_node
);
479 /* yield a bit to allow any final network messages
480 * to get handled on remaining nodes */
483 /* success! see if any other nodes need recovery */
484 mlog(0, "DONE mastering recovery of %s:%u here(this=%u)!\n",
485 dlm
->name
, dlm
->reco
.dead_node
, dlm
->node_num
);
486 dlm_reset_recovery(dlm
);
488 dlm_end_recovery(dlm
);
490 /* continue and look for another dead node */
494 static int dlm_remaster_locks(struct dlm_ctxt
*dlm
, u8 dead_node
)
497 struct dlm_reco_node_data
*ndata
;
498 struct list_head
*iter
;
503 status
= dlm_init_recovery_area(dlm
, dead_node
);
507 /* safe to access the node data list without a lock, since this
508 * process is the only one to change the list */
509 list_for_each(iter
, &dlm
->reco
.node_data
) {
510 ndata
= list_entry (iter
, struct dlm_reco_node_data
, list
);
511 BUG_ON(ndata
->state
!= DLM_RECO_NODE_DATA_INIT
);
512 ndata
->state
= DLM_RECO_NODE_DATA_REQUESTING
;
514 mlog(0, "requesting lock info from node %u\n",
517 if (ndata
->node_num
== dlm
->node_num
) {
518 ndata
->state
= DLM_RECO_NODE_DATA_DONE
;
522 status
= dlm_request_all_locks(dlm
, ndata
->node_num
, dead_node
);
525 if (dlm_is_host_down(status
))
526 ndata
->state
= DLM_RECO_NODE_DATA_DEAD
;
533 switch (ndata
->state
) {
534 case DLM_RECO_NODE_DATA_INIT
:
535 case DLM_RECO_NODE_DATA_FINALIZE_SENT
:
536 case DLM_RECO_NODE_DATA_REQUESTED
:
539 case DLM_RECO_NODE_DATA_DEAD
:
540 mlog(0, "node %u died after requesting "
541 "recovery info for node %u\n",
542 ndata
->node_num
, dead_node
);
547 case DLM_RECO_NODE_DATA_REQUESTING
:
548 ndata
->state
= DLM_RECO_NODE_DATA_REQUESTED
;
549 mlog(0, "now receiving recovery data from "
550 "node %u for dead node %u\n",
551 ndata
->node_num
, dead_node
);
553 case DLM_RECO_NODE_DATA_RECEIVING
:
554 mlog(0, "already receiving recovery data from "
555 "node %u for dead node %u\n",
556 ndata
->node_num
, dead_node
);
558 case DLM_RECO_NODE_DATA_DONE
:
559 mlog(0, "already DONE receiving recovery data "
560 "from node %u for dead node %u\n",
561 ndata
->node_num
, dead_node
);
566 mlog(0, "done requesting all lock info\n");
568 /* nodes should be sending reco data now
569 * just need to wait */
572 /* check all the nodes now to see if we are
573 * done, or if anyone died */
575 spin_lock(&dlm_reco_state_lock
);
576 list_for_each(iter
, &dlm
->reco
.node_data
) {
577 ndata
= list_entry (iter
, struct dlm_reco_node_data
, list
);
579 mlog(0, "checking recovery state of node %u\n",
581 switch (ndata
->state
) {
582 case DLM_RECO_NODE_DATA_INIT
:
583 case DLM_RECO_NODE_DATA_REQUESTING
:
584 mlog(ML_ERROR
, "bad ndata state for "
585 "node %u: state=%d\n",
586 ndata
->node_num
, ndata
->state
);
589 case DLM_RECO_NODE_DATA_DEAD
:
590 mlog(ML_NOTICE
, "node %u died after "
591 "requesting recovery info for "
592 "node %u\n", ndata
->node_num
,
594 spin_unlock(&dlm_reco_state_lock
);
598 /* instead of spinning like crazy here,
599 * wait for the domain map to catch up
600 * with the network state. otherwise this
601 * can be hit hundreds of times before
602 * the node is really seen as dead. */
603 wait_event_timeout(dlm
->dlm_reco_thread_wq
,
604 dlm_is_node_dead(dlm
,
606 msecs_to_jiffies(1000));
607 mlog(0, "waited 1 sec for %u, "
608 "dead? %s\n", ndata
->node_num
,
609 dlm_is_node_dead(dlm
, ndata
->node_num
) ?
612 case DLM_RECO_NODE_DATA_RECEIVING
:
613 case DLM_RECO_NODE_DATA_REQUESTED
:
614 mlog(0, "%s: node %u still in state %s\n",
615 dlm
->name
, ndata
->node_num
,
616 ndata
->state
==DLM_RECO_NODE_DATA_RECEIVING
?
617 "receiving" : "requested");
620 case DLM_RECO_NODE_DATA_DONE
:
621 mlog(0, "%s: node %u state is done\n",
622 dlm
->name
, ndata
->node_num
);
624 case DLM_RECO_NODE_DATA_FINALIZE_SENT
:
625 mlog(0, "%s: node %u state is finalize\n",
626 dlm
->name
, ndata
->node_num
);
630 spin_unlock(&dlm_reco_state_lock
);
632 mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass
,
633 all_nodes_done
?"yes":"no");
634 if (all_nodes_done
) {
637 /* all nodes are now in DLM_RECO_NODE_DATA_DONE state
638 * just send a finalize message to everyone and
640 mlog(0, "all nodes are done! send finalize\n");
641 ret
= dlm_send_finalize_reco_message(dlm
);
645 spin_lock(&dlm
->spinlock
);
646 dlm_finish_local_lockres_recovery(dlm
, dead_node
,
648 spin_unlock(&dlm
->spinlock
);
649 mlog(0, "should be done with recovery!\n");
651 mlog(0, "finishing recovery of %s at %lu, "
652 "dead=%u, this=%u, new=%u\n", dlm
->name
,
653 jiffies
, dlm
->reco
.dead_node
,
654 dlm
->node_num
, dlm
->reco
.new_master
);
657 /* rescan everything marked dirty along the way */
658 dlm_kick_thread(dlm
, NULL
);
661 /* wait to be signalled, with periodic timeout
662 * to check for node death */
663 wait_event_interruptible_timeout(dlm
->dlm_reco_thread_wq
,
664 kthread_should_stop(),
665 msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS
));
671 dlm_destroy_recovery_area(dlm
, dead_node
);
677 static int dlm_init_recovery_area(struct dlm_ctxt
*dlm
, u8 dead_node
)
680 struct dlm_reco_node_data
*ndata
;
682 spin_lock(&dlm
->spinlock
);
683 memcpy(dlm
->reco
.node_map
, dlm
->domain_map
, sizeof(dlm
->domain_map
));
684 /* nodes can only be removed (by dying) after dropping
685 * this lock, and death will be trapped later, so this should do */
686 spin_unlock(&dlm
->spinlock
);
689 num
= find_next_bit (dlm
->reco
.node_map
, O2NM_MAX_NODES
, num
);
690 if (num
>= O2NM_MAX_NODES
) {
693 BUG_ON(num
== dead_node
);
695 ndata
= kcalloc(1, sizeof(*ndata
), GFP_KERNEL
);
697 dlm_destroy_recovery_area(dlm
, dead_node
);
700 ndata
->node_num
= num
;
701 ndata
->state
= DLM_RECO_NODE_DATA_INIT
;
702 spin_lock(&dlm_reco_state_lock
);
703 list_add_tail(&ndata
->list
, &dlm
->reco
.node_data
);
704 spin_unlock(&dlm_reco_state_lock
);
711 static void dlm_destroy_recovery_area(struct dlm_ctxt
*dlm
, u8 dead_node
)
713 struct list_head
*iter
, *iter2
;
714 struct dlm_reco_node_data
*ndata
;
717 spin_lock(&dlm_reco_state_lock
);
718 list_splice_init(&dlm
->reco
.node_data
, &tmplist
);
719 spin_unlock(&dlm_reco_state_lock
);
721 list_for_each_safe(iter
, iter2
, &tmplist
) {
722 ndata
= list_entry (iter
, struct dlm_reco_node_data
, list
);
723 list_del_init(&ndata
->list
);
728 static int dlm_request_all_locks(struct dlm_ctxt
*dlm
, u8 request_from
,
731 struct dlm_lock_request lr
;
737 mlog(0, "dlm_request_all_locks: dead node is %u, sending request "
738 "to %u\n", dead_node
, request_from
);
740 memset(&lr
, 0, sizeof(lr
));
741 lr
.node_idx
= dlm
->node_num
;
742 lr
.dead_node
= dead_node
;
746 ret
= o2net_send_message(DLM_LOCK_REQUEST_MSG
, dlm
->key
,
747 &lr
, sizeof(lr
), request_from
, NULL
);
749 /* negative status is handled by caller */
753 // return from here, then
754 // sleep until all received or error
759 int dlm_request_all_locks_handler(struct o2net_msg
*msg
, u32 len
, void *data
)
761 struct dlm_ctxt
*dlm
= data
;
762 struct dlm_lock_request
*lr
= (struct dlm_lock_request
*)msg
->buf
;
764 struct dlm_work_item
*item
= NULL
;
769 if (lr
->dead_node
!= dlm
->reco
.dead_node
) {
770 mlog(ML_ERROR
, "%s: node %u sent dead_node=%u, but local "
771 "dead_node is %u\n", dlm
->name
, lr
->node_idx
,
772 lr
->dead_node
, dlm
->reco
.dead_node
);
773 dlm_print_reco_node_status(dlm
);
778 BUG_ON(lr
->dead_node
!= dlm
->reco
.dead_node
);
780 item
= kcalloc(1, sizeof(*item
), GFP_KERNEL
);
786 /* this will get freed by dlm_request_all_locks_worker */
787 buf
= (char *) __get_free_page(GFP_KERNEL
);
794 /* queue up work for dlm_request_all_locks_worker */
795 dlm_grab(dlm
); /* get an extra ref for the work item */
796 dlm_init_work_item(dlm
, item
, dlm_request_all_locks_worker
, buf
);
797 item
->u
.ral
.reco_master
= lr
->node_idx
;
798 item
->u
.ral
.dead_node
= lr
->dead_node
;
799 spin_lock(&dlm
->work_lock
);
800 list_add_tail(&item
->list
, &dlm
->work_list
);
801 spin_unlock(&dlm
->work_lock
);
802 schedule_work(&dlm
->dispatched_work
);
808 static void dlm_request_all_locks_worker(struct dlm_work_item
*item
, void *data
)
810 struct dlm_migratable_lockres
*mres
;
811 struct dlm_lock_resource
*res
;
812 struct dlm_ctxt
*dlm
;
813 LIST_HEAD(resources
);
814 struct list_head
*iter
;
816 u8 dead_node
, reco_master
;
817 int skip_all_done
= 0;
820 dead_node
= item
->u
.ral
.dead_node
;
821 reco_master
= item
->u
.ral
.reco_master
;
822 mres
= (struct dlm_migratable_lockres
*)data
;
824 mlog(0, "%s: recovery worker started, dead=%u, master=%u\n",
825 dlm
->name
, dead_node
, reco_master
);
827 if (dead_node
!= dlm
->reco
.dead_node
||
828 reco_master
!= dlm
->reco
.new_master
) {
829 /* show extra debug info if the recovery state is messed */
830 mlog(ML_ERROR
, "%s: bad reco state: reco(dead=%u, master=%u), "
831 "request(dead=%u, master=%u)\n",
832 dlm
->name
, dlm
->reco
.dead_node
, dlm
->reco
.new_master
,
833 dead_node
, reco_master
);
834 mlog(ML_ERROR
, "%s: name=%.*s master=%u locks=%u/%u flags=%u "
835 "entry[0]={c=%u:%llu,l=%u,f=%u,t=%d,ct=%d,hb=%d,n=%u}\n",
836 dlm
->name
, mres
->lockname_len
, mres
->lockname
, mres
->master
,
837 mres
->num_locks
, mres
->total_locks
, mres
->flags
,
838 dlm_get_lock_cookie_node(mres
->ml
[0].cookie
),
839 dlm_get_lock_cookie_seq(mres
->ml
[0].cookie
),
840 mres
->ml
[0].list
, mres
->ml
[0].flags
,
841 mres
->ml
[0].type
, mres
->ml
[0].convert_type
,
842 mres
->ml
[0].highest_blocked
, mres
->ml
[0].node
);
845 BUG_ON(dead_node
!= dlm
->reco
.dead_node
);
846 BUG_ON(reco_master
!= dlm
->reco
.new_master
);
848 /* lock resources should have already been moved to the
849 * dlm->reco.resources list. now move items from that list
850 * to a temp list if the dead owner matches. note that the
851 * whole cluster recovers only one node at a time, so we
852 * can safely move UNKNOWN lock resources for each recovery
854 dlm_move_reco_locks_to_list(dlm
, &resources
, dead_node
);
856 /* now we can begin blasting lockreses without the dlm lock */
858 /* any errors returned will be due to the new_master dying,
859 * the dlm_reco_thread should detect this */
860 list_for_each(iter
, &resources
) {
861 res
= list_entry (iter
, struct dlm_lock_resource
, recovering
);
862 ret
= dlm_send_one_lockres(dlm
, res
, mres
, reco_master
,
865 mlog(ML_ERROR
, "%s: node %u went down while sending "
866 "recovery state for dead node %u, ret=%d\n", dlm
->name
,
867 reco_master
, dead_node
, ret
);
873 /* move the resources back to the list */
874 spin_lock(&dlm
->spinlock
);
875 list_splice_init(&resources
, &dlm
->reco
.resources
);
876 spin_unlock(&dlm
->spinlock
);
878 if (!skip_all_done
) {
879 ret
= dlm_send_all_done_msg(dlm
, dead_node
, reco_master
);
881 mlog(ML_ERROR
, "%s: node %u went down while sending "
882 "recovery all-done for dead node %u, ret=%d\n",
883 dlm
->name
, reco_master
, dead_node
, ret
);
887 free_page((unsigned long)data
);
891 static int dlm_send_all_done_msg(struct dlm_ctxt
*dlm
, u8 dead_node
, u8 send_to
)
894 struct dlm_reco_data_done done_msg
;
896 memset(&done_msg
, 0, sizeof(done_msg
));
897 done_msg
.node_idx
= dlm
->node_num
;
898 done_msg
.dead_node
= dead_node
;
899 mlog(0, "sending DATA DONE message to %u, "
900 "my node=%u, dead node=%u\n", send_to
, done_msg
.node_idx
,
903 ret
= o2net_send_message(DLM_RECO_DATA_DONE_MSG
, dlm
->key
, &done_msg
,
904 sizeof(done_msg
), send_to
, &tmpret
);
906 if (!dlm_is_host_down(ret
)) {
908 mlog(ML_ERROR
, "%s: unknown error sending data-done "
909 "to %u\n", dlm
->name
, send_to
);
918 int dlm_reco_data_done_handler(struct o2net_msg
*msg
, u32 len
, void *data
)
920 struct dlm_ctxt
*dlm
= data
;
921 struct dlm_reco_data_done
*done
= (struct dlm_reco_data_done
*)msg
->buf
;
922 struct list_head
*iter
;
923 struct dlm_reco_node_data
*ndata
= NULL
;
929 mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, "
930 "node_idx=%u, this node=%u\n", done
->dead_node
,
931 dlm
->reco
.dead_node
, done
->node_idx
, dlm
->node_num
);
933 mlog_bug_on_msg((done
->dead_node
!= dlm
->reco
.dead_node
),
934 "Got DATA DONE: dead_node=%u, reco.dead_node=%u, "
935 "node_idx=%u, this node=%u\n", done
->dead_node
,
936 dlm
->reco
.dead_node
, done
->node_idx
, dlm
->node_num
);
938 spin_lock(&dlm_reco_state_lock
);
939 list_for_each(iter
, &dlm
->reco
.node_data
) {
940 ndata
= list_entry (iter
, struct dlm_reco_node_data
, list
);
941 if (ndata
->node_num
!= done
->node_idx
)
944 switch (ndata
->state
) {
945 /* should have moved beyond INIT but not to FINALIZE yet */
946 case DLM_RECO_NODE_DATA_INIT
:
947 case DLM_RECO_NODE_DATA_DEAD
:
948 case DLM_RECO_NODE_DATA_FINALIZE_SENT
:
949 mlog(ML_ERROR
, "bad ndata state for node %u:"
950 " state=%d\n", ndata
->node_num
,
954 /* these states are possible at this point, anywhere along
955 * the line of recovery */
956 case DLM_RECO_NODE_DATA_DONE
:
957 case DLM_RECO_NODE_DATA_RECEIVING
:
958 case DLM_RECO_NODE_DATA_REQUESTED
:
959 case DLM_RECO_NODE_DATA_REQUESTING
:
960 mlog(0, "node %u is DONE sending "
964 ndata
->state
= DLM_RECO_NODE_DATA_DONE
;
969 spin_unlock(&dlm_reco_state_lock
);
971 /* wake the recovery thread, some node is done */
973 dlm_kick_recovery_thread(dlm
);
976 mlog(ML_ERROR
, "failed to find recovery node data for node "
977 "%u\n", done
->node_idx
);
980 mlog(0, "leaving reco data done handler, ret=%d\n", ret
);
984 static void dlm_move_reco_locks_to_list(struct dlm_ctxt
*dlm
,
985 struct list_head
*list
,
988 struct dlm_lock_resource
*res
;
989 struct list_head
*iter
, *iter2
;
990 struct dlm_lock
*lock
;
992 spin_lock(&dlm
->spinlock
);
993 list_for_each_safe(iter
, iter2
, &dlm
->reco
.resources
) {
994 res
= list_entry (iter
, struct dlm_lock_resource
, recovering
);
995 /* always prune any $RECOVERY entries for dead nodes,
996 * otherwise hangs can occur during later recovery */
997 if (dlm_is_recovery_lock(res
->lockname
.name
,
998 res
->lockname
.len
)) {
999 spin_lock(&res
->spinlock
);
1000 list_for_each_entry(lock
, &res
->granted
, list
) {
1001 if (lock
->ml
.node
== dead_node
) {
1002 mlog(0, "AHA! there was "
1003 "a $RECOVERY lock for dead "
1005 dead_node
, dlm
->name
);
1006 list_del_init(&lock
->list
);
1011 spin_unlock(&res
->spinlock
);
1015 if (res
->owner
== dead_node
) {
1016 mlog(0, "found lockres owned by dead node while "
1017 "doing recovery for node %u. sending it.\n",
1019 list_move_tail(&res
->recovering
, list
);
1020 } else if (res
->owner
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
1021 mlog(0, "found UNKNOWN owner while doing recovery "
1022 "for node %u. sending it.\n", dead_node
);
1023 list_move_tail(&res
->recovering
, list
);
1026 spin_unlock(&dlm
->spinlock
);
1029 static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource
*res
)
1031 int total_locks
= 0;
1032 struct list_head
*iter
, *queue
= &res
->granted
;
1035 for (i
=0; i
<3; i
++) {
1036 list_for_each(iter
, queue
)
1044 static int dlm_send_mig_lockres_msg(struct dlm_ctxt
*dlm
,
1045 struct dlm_migratable_lockres
*mres
,
1047 struct dlm_lock_resource
*res
,
1050 u64 mig_cookie
= be64_to_cpu(mres
->mig_cookie
);
1051 int mres_total_locks
= be32_to_cpu(mres
->total_locks
);
1052 int sz
, ret
= 0, status
= 0;
1053 u8 orig_flags
= mres
->flags
,
1054 orig_master
= mres
->master
;
1056 BUG_ON(mres
->num_locks
> DLM_MAX_MIGRATABLE_LOCKS
);
1057 if (!mres
->num_locks
)
1060 sz
= sizeof(struct dlm_migratable_lockres
) +
1061 (mres
->num_locks
* sizeof(struct dlm_migratable_lock
));
1063 /* add an all-done flag if we reached the last lock */
1064 orig_flags
= mres
->flags
;
1065 BUG_ON(total_locks
> mres_total_locks
);
1066 if (total_locks
== mres_total_locks
)
1067 mres
->flags
|= DLM_MRES_ALL_DONE
;
1070 ret
= o2net_send_message(DLM_MIG_LOCKRES_MSG
, dlm
->key
, mres
,
1071 sz
, send_to
, &status
);
1073 /* XXX: negative status is not handled.
1074 * this will end up killing this node. */
1077 /* might get an -ENOMEM back here */
1082 if (ret
== -EFAULT
) {
1083 mlog(ML_ERROR
, "node %u told me to kill "
1084 "myself!\n", send_to
);
1090 /* zero and reinit the message buffer */
1091 dlm_init_migratable_lockres(mres
, res
->lockname
.name
,
1092 res
->lockname
.len
, mres_total_locks
,
1093 mig_cookie
, orig_flags
, orig_master
);
1097 static void dlm_init_migratable_lockres(struct dlm_migratable_lockres
*mres
,
1098 const char *lockname
, int namelen
,
1099 int total_locks
, u64 cookie
,
1100 u8 flags
, u8 master
)
1102 /* mres here is one full page */
1103 memset(mres
, 0, PAGE_SIZE
);
1104 mres
->lockname_len
= namelen
;
1105 memcpy(mres
->lockname
, lockname
, namelen
);
1106 mres
->num_locks
= 0;
1107 mres
->total_locks
= cpu_to_be32(total_locks
);
1108 mres
->mig_cookie
= cpu_to_be64(cookie
);
1109 mres
->flags
= flags
;
1110 mres
->master
= master
;
1114 /* returns 1 if this lock fills the network structure,
1116 static int dlm_add_lock_to_array(struct dlm_lock
*lock
,
1117 struct dlm_migratable_lockres
*mres
, int queue
)
1119 struct dlm_migratable_lock
*ml
;
1120 int lock_num
= mres
->num_locks
;
1122 ml
= &(mres
->ml
[lock_num
]);
1123 ml
->cookie
= lock
->ml
.cookie
;
1124 ml
->type
= lock
->ml
.type
;
1125 ml
->convert_type
= lock
->ml
.convert_type
;
1126 ml
->highest_blocked
= lock
->ml
.highest_blocked
;
1129 ml
->flags
= lock
->lksb
->flags
;
1130 /* send our current lvb */
1131 if (ml
->type
== LKM_EXMODE
||
1132 ml
->type
== LKM_PRMODE
) {
1133 /* if it is already set, this had better be a PR
1134 * and it has to match */
1135 if (!dlm_lvb_is_empty(mres
->lvb
) &&
1136 (ml
->type
== LKM_EXMODE
||
1137 memcmp(mres
->lvb
, lock
->lksb
->lvb
, DLM_LVB_LEN
))) {
1138 mlog(ML_ERROR
, "mismatched lvbs!\n");
1139 __dlm_print_one_lock_resource(lock
->lockres
);
1142 memcpy(mres
->lvb
, lock
->lksb
->lvb
, DLM_LVB_LEN
);
1145 ml
->node
= lock
->ml
.node
;
1147 /* we reached the max, send this network message */
1148 if (mres
->num_locks
== DLM_MAX_MIGRATABLE_LOCKS
)
1154 int dlm_send_one_lockres(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
,
1155 struct dlm_migratable_lockres
*mres
,
1156 u8 send_to
, u8 flags
)
1158 struct list_head
*queue
, *iter
;
1161 struct dlm_lock
*lock
;
1164 BUG_ON(!(flags
& (DLM_MRES_RECOVERY
|DLM_MRES_MIGRATION
)));
1166 mlog(0, "sending to %u\n", send_to
);
1168 total_locks
= dlm_num_locks_in_lockres(res
);
1169 if (total_locks
> DLM_MAX_MIGRATABLE_LOCKS
) {
1170 /* rare, but possible */
1171 mlog(0, "argh. lockres has %d locks. this will "
1172 "require more than one network packet to "
1173 "migrate\n", total_locks
);
1174 mig_cookie
= dlm_get_next_mig_cookie();
1177 dlm_init_migratable_lockres(mres
, res
->lockname
.name
,
1178 res
->lockname
.len
, total_locks
,
1179 mig_cookie
, flags
, res
->owner
);
1182 for (i
=DLM_GRANTED_LIST
; i
<=DLM_BLOCKED_LIST
; i
++) {
1183 queue
= dlm_list_idx_to_ptr(res
, i
);
1184 list_for_each(iter
, queue
) {
1185 lock
= list_entry (iter
, struct dlm_lock
, list
);
1187 /* add another lock. */
1189 if (!dlm_add_lock_to_array(lock
, mres
, i
))
1192 /* this filled the lock message,
1193 * we must send it immediately. */
1194 ret
= dlm_send_mig_lockres_msg(dlm
, mres
, send_to
,
1200 /* flush any remaining locks */
1201 ret
= dlm_send_mig_lockres_msg(dlm
, mres
, send_to
, res
, total_locks
);
1207 mlog(ML_ERROR
, "%s: dlm_send_mig_lockres_msg returned %d\n",
1209 if (!dlm_is_host_down(ret
))
1211 mlog(0, "%s: node %u went down while sending %s "
1212 "lockres %.*s\n", dlm
->name
, send_to
,
1213 flags
& DLM_MRES_RECOVERY
? "recovery" : "migration",
1214 res
->lockname
.len
, res
->lockname
.name
);
1221 * this message will contain no more than one page worth of
1222 * recovery data, and it will work on only one lockres.
1223 * there may be many locks in this page, and we may need to wait
1224 * for additional packets to complete all the locks (rare, but
1228 * NOTE: the allocation error cases here are scary
1229 * we really cannot afford to fail an alloc in recovery
1230 * do we spin? returning an error only delays the problem really
1233 int dlm_mig_lockres_handler(struct o2net_msg
*msg
, u32 len
, void *data
)
1235 struct dlm_ctxt
*dlm
= data
;
1236 struct dlm_migratable_lockres
*mres
=
1237 (struct dlm_migratable_lockres
*)msg
->buf
;
1241 struct dlm_work_item
*item
= NULL
;
1242 struct dlm_lock_resource
*res
= NULL
;
1247 BUG_ON(!(mres
->flags
& (DLM_MRES_RECOVERY
|DLM_MRES_MIGRATION
)));
1249 real_master
= mres
->master
;
1250 if (real_master
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
1251 /* cannot migrate a lockres with no master */
1252 BUG_ON(!(mres
->flags
& DLM_MRES_RECOVERY
));
1255 mlog(0, "%s message received from node %u\n",
1256 (mres
->flags
& DLM_MRES_RECOVERY
) ?
1257 "recovery" : "migration", mres
->master
);
1258 if (mres
->flags
& DLM_MRES_ALL_DONE
)
1259 mlog(0, "all done flag. all lockres data received!\n");
1262 buf
= kmalloc(be16_to_cpu(msg
->data_len
), GFP_KERNEL
);
1263 item
= kcalloc(1, sizeof(*item
), GFP_KERNEL
);
1267 /* lookup the lock to see if we have a secondary queue for this
1268 * already... just add the locks in and this will have its owner
1269 * and RECOVERY flag changed when it completes. */
1270 res
= dlm_lookup_lockres(dlm
, mres
->lockname
, mres
->lockname_len
);
1272 /* this will get a ref on res */
1273 /* mark it as recovering/migrating and hash it */
1274 spin_lock(&res
->spinlock
);
1275 if (mres
->flags
& DLM_MRES_RECOVERY
) {
1276 res
->state
|= DLM_LOCK_RES_RECOVERING
;
1278 if (res
->state
& DLM_LOCK_RES_MIGRATING
) {
1279 /* this is at least the second
1280 * lockres message */
1281 mlog(0, "lock %.*s is already migrating\n",
1284 } else if (res
->state
& DLM_LOCK_RES_RECOVERING
) {
1285 /* caller should BUG */
1286 mlog(ML_ERROR
, "node is attempting to migrate "
1287 "lock %.*s, but marked as recovering!\n",
1288 mres
->lockname_len
, mres
->lockname
);
1290 spin_unlock(&res
->spinlock
);
1293 res
->state
|= DLM_LOCK_RES_MIGRATING
;
1295 spin_unlock(&res
->spinlock
);
1297 /* need to allocate, just like if it was
1298 * mastered here normally */
1299 res
= dlm_new_lockres(dlm
, mres
->lockname
, mres
->lockname_len
);
1303 /* to match the ref that we would have gotten if
1304 * dlm_lookup_lockres had succeeded */
1305 dlm_lockres_get(res
);
1307 /* mark it as recovering/migrating and hash it */
1308 if (mres
->flags
& DLM_MRES_RECOVERY
)
1309 res
->state
|= DLM_LOCK_RES_RECOVERING
;
1311 res
->state
|= DLM_LOCK_RES_MIGRATING
;
1313 spin_lock(&dlm
->spinlock
);
1314 __dlm_insert_lockres(dlm
, res
);
1315 spin_unlock(&dlm
->spinlock
);
1317 /* now that the new lockres is inserted,
1318 * make it usable by other processes */
1319 spin_lock(&res
->spinlock
);
1320 res
->state
&= ~DLM_LOCK_RES_IN_PROGRESS
;
1321 spin_unlock(&res
->spinlock
);
1323 /* add an extra ref for just-allocated lockres
1324 * otherwise the lockres will be purged immediately */
1325 dlm_lockres_get(res
);
1329 /* at this point we have allocated everything we need,
1330 * and we have a hashed lockres with an extra ref and
1331 * the proper res->state flags. */
1333 if (mres
->master
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
1334 /* migration cannot have an unknown master */
1335 BUG_ON(!(mres
->flags
& DLM_MRES_RECOVERY
));
1336 mlog(0, "recovery has passed me a lockres with an "
1337 "unknown owner.. will need to requery: "
1338 "%.*s\n", mres
->lockname_len
, mres
->lockname
);
1340 spin_lock(&res
->spinlock
);
1341 dlm_change_lockres_owner(dlm
, res
, dlm
->node_num
);
1342 spin_unlock(&res
->spinlock
);
1345 /* queue up work for dlm_mig_lockres_worker */
1346 dlm_grab(dlm
); /* get an extra ref for the work item */
1347 memcpy(buf
, msg
->buf
, be16_to_cpu(msg
->data_len
)); /* copy the whole message */
1348 dlm_init_work_item(dlm
, item
, dlm_mig_lockres_worker
, buf
);
1349 item
->u
.ml
.lockres
= res
; /* already have a ref */
1350 item
->u
.ml
.real_master
= real_master
;
1351 spin_lock(&dlm
->work_lock
);
1352 list_add_tail(&item
->list
, &dlm
->work_list
);
1353 spin_unlock(&dlm
->work_lock
);
1354 schedule_work(&dlm
->dispatched_work
);
1370 static void dlm_mig_lockres_worker(struct dlm_work_item
*item
, void *data
)
1372 struct dlm_ctxt
*dlm
= data
;
1373 struct dlm_migratable_lockres
*mres
;
1375 struct dlm_lock_resource
*res
;
1379 mres
= (struct dlm_migratable_lockres
*)data
;
1381 res
= item
->u
.ml
.lockres
;
1382 real_master
= item
->u
.ml
.real_master
;
1384 if (real_master
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
1385 /* this case is super-rare. only occurs if
1386 * node death happens during migration. */
1388 ret
= dlm_lockres_master_requery(dlm
, res
, &real_master
);
1390 mlog(0, "dlm_lockres_master_requery ret=%d\n",
1394 if (real_master
== DLM_LOCK_RES_OWNER_UNKNOWN
) {
1395 mlog(0, "lockres %.*s not claimed. "
1396 "this node will take it.\n",
1397 res
->lockname
.len
, res
->lockname
.name
);
1399 mlog(0, "master needs to respond to sender "
1400 "that node %u still owns %.*s\n",
1401 real_master
, res
->lockname
.len
,
1402 res
->lockname
.name
);
1403 /* cannot touch this lockres */
1408 ret
= dlm_process_recovery_data(dlm
, res
, mres
);
1410 mlog(0, "dlm_process_recovery_data returned %d\n", ret
);
1412 mlog(0, "dlm_process_recovery_data succeeded\n");
1414 if ((mres
->flags
& (DLM_MRES_MIGRATION
|DLM_MRES_ALL_DONE
)) ==
1415 (DLM_MRES_MIGRATION
|DLM_MRES_ALL_DONE
)) {
1416 ret
= dlm_finish_migration(dlm
, res
, mres
->master
);
1428 int dlm_lockres_master_requery(struct dlm_ctxt
*dlm
,
1429 struct dlm_lock_resource
*res
, u8
*real_master
)
1431 struct dlm_node_iter iter
;
1435 *real_master
= DLM_LOCK_RES_OWNER_UNKNOWN
;
1437 /* we only reach here if one of the two nodes in a
1438 * migration died while the migration was in progress.
1439 * at this point we need to requery the master. we
1440 * know that the new_master got as far as creating
1441 * an mle on at least one node, but we do not know
1442 * if any nodes had actually cleared the mle and set
1443 * the master to the new_master. the old master
1444 * is supposed to set the owner to UNKNOWN in the
1445 * event of a new_master death, so the only possible
1446 * responses that we can get from nodes here are
1447 * that the master is new_master, or that the master
1449 * if all nodes come back with UNKNOWN then we know
1450 * the lock needs remastering here.
1451 * if any node comes back with a valid master, check
1452 * to see if that master is the one that we are
1453 * recovering. if so, then the new_master died and
1454 * we need to remaster this lock. if not, then the
1455 * new_master survived and that node will respond to
1456 * other nodes about the owner.
1457 * if there is an owner, this node needs to dump this
1458 * lockres and alert the sender that this lockres
1460 spin_lock(&dlm
->spinlock
);
1461 dlm_node_iter_init(dlm
->domain_map
, &iter
);
1462 spin_unlock(&dlm
->spinlock
);
1464 while ((nodenum
= dlm_node_iter_next(&iter
)) >= 0) {
1465 /* do not send to self */
1466 if (nodenum
== dlm
->node_num
)
1468 ret
= dlm_do_master_requery(dlm
, res
, nodenum
, real_master
);
1471 if (!dlm_is_host_down(ret
))
1473 /* host is down, so answer for that node would be
1474 * DLM_LOCK_RES_OWNER_UNKNOWN. continue. */
1476 if (*real_master
!= DLM_LOCK_RES_OWNER_UNKNOWN
) {
1477 mlog(0, "lock master is %u\n", *real_master
);
1485 int dlm_do_master_requery(struct dlm_ctxt
*dlm
, struct dlm_lock_resource
*res
,
1486 u8 nodenum
, u8
*real_master
)
1489 struct dlm_master_requery req
;
1490 int status
= DLM_LOCK_RES_OWNER_UNKNOWN
;
1492 memset(&req
, 0, sizeof(req
));
1493 req
.node_idx
= dlm
->node_num
;
1494 req
.namelen
= res
->lockname
.len
;
1495 memcpy(req
.name
, res
->lockname
.name
, res
->lockname
.len
);
1497 ret
= o2net_send_message(DLM_MASTER_REQUERY_MSG
, dlm
->key
,
1498 &req
, sizeof(req
), nodenum
, &status
);
1499 /* XXX: negative status not handled properly here. */
1504 BUG_ON(status
> DLM_LOCK_RES_OWNER_UNKNOWN
);
1505 *real_master
= (u8
) (status
& 0xff);
1506 mlog(0, "node %u responded to master requery with %u\n",
1507 nodenum
, *real_master
);
1514 /* this function cannot error, so unless the sending
1515 * or receiving of the message failed, the owner can
1517 int dlm_master_requery_handler(struct o2net_msg
*msg
, u32 len
, void *data
)
1519 struct dlm_ctxt
*dlm
= data
;
1520 struct dlm_master_requery
*req
= (struct dlm_master_requery
*)msg
->buf
;
1521 struct dlm_lock_resource
*res
= NULL
;
1523 int master
= DLM_LOCK_RES_OWNER_UNKNOWN
;
1524 u32 flags
= DLM_ASSERT_MASTER_REQUERY
;
1526 if (!dlm_grab(dlm
)) {
1527 /* since the domain has gone away on this
1528 * node, the proper response is UNKNOWN */
1532 hash
= dlm_lockid_hash(req
->name
, req
->namelen
);
1534 spin_lock(&dlm
->spinlock
);
1535 res
= __dlm_lookup_lockres(dlm
, req
->name
, req
->namelen
, hash
);
1537 spin_lock(&res
->spinlock
);
1538 master
= res
->owner
;
1539 if (master
== dlm
->node_num
) {
1540 int ret
= dlm_dispatch_assert_master(dlm
, res
,
1543 mlog_errno(-ENOMEM
);
1548 spin_unlock(&res
->spinlock
);
1550 spin_unlock(&dlm
->spinlock
);
1556 static inline struct list_head
*
1557 dlm_list_num_to_pointer(struct dlm_lock_resource
*res
, int list_num
)
1559 struct list_head
*ret
;
1560 BUG_ON(list_num
< 0);
1561 BUG_ON(list_num
> 2);
1562 ret
= &(res
->granted
);
1566 /* TODO: do ast flush business
1567 * TODO: do MIGRATING and RECOVERING spinning
1571 * NOTE about in-flight requests during migration:
1573 * Before attempting the migrate, the master has marked the lockres as
1574 * MIGRATING and then flushed all of its pending ASTS. So any in-flight
1575 * requests either got queued before the MIGRATING flag got set, in which
1576 * case the lock data will reflect the change and a return message is on
1577 * the way, or the request failed to get in before MIGRATING got set. In
1578 * this case, the caller will be told to spin and wait for the MIGRATING
1579 * flag to be dropped, then recheck the master.
1580 * This holds true for the convert, cancel and unlock cases, and since lvb
1581 * updates are tied to these same messages, it applies to lvb updates as
1582 * well. For the lock case, there is no way a lock can be on the master
1583 * queue and not be on the secondary queue since the lock is always added
1584 * locally first. This means that the new target node will never be sent
1585 * a lock that he doesn't already have on the list.
1586 * In total, this means that the local lock is correct and should not be
1587 * updated to match the one sent by the master. Any messages sent back
1588 * from the master before the MIGRATING flag will bring the lock properly
1589 * up-to-date, and the change will be ordered properly for the waiter.
1590 * We will *not* attempt to modify the lock underneath the waiter.
1593 static int dlm_process_recovery_data(struct dlm_ctxt
*dlm
,
1594 struct dlm_lock_resource
*res
,
1595 struct dlm_migratable_lockres
*mres
)
1597 struct dlm_migratable_lock
*ml
;
1598 struct list_head
*queue
;
1599 struct dlm_lock
*newlock
= NULL
;
1600 struct dlm_lockstatus
*lksb
= NULL
;
1603 struct list_head
*iter
;
1604 struct dlm_lock
*lock
= NULL
;
1606 mlog(0, "running %d locks for this lockres\n", mres
->num_locks
);
1607 for (i
=0; i
<mres
->num_locks
; i
++) {
1608 ml
= &(mres
->ml
[i
]);
1609 BUG_ON(ml
->highest_blocked
!= LKM_IVMODE
);
1613 queue
= dlm_list_num_to_pointer(res
, ml
->list
);
1615 /* if the lock is for the local node it needs to
1616 * be moved to the proper location within the queue.
1617 * do not allocate a new lock structure. */
1618 if (ml
->node
== dlm
->node_num
) {
1619 /* MIGRATION ONLY! */
1620 BUG_ON(!(mres
->flags
& DLM_MRES_MIGRATION
));
1622 spin_lock(&res
->spinlock
);
1623 list_for_each(iter
, queue
) {
1624 lock
= list_entry (iter
, struct dlm_lock
, list
);
1625 if (lock
->ml
.cookie
!= ml
->cookie
)
1631 /* lock is always created locally first, and
1632 * destroyed locally last. it must be on the list */
1635 mlog(ML_ERROR
, "could not find local lock "
1636 "with cookie %u:%llu!\n",
1637 dlm_get_lock_cookie_node(c
),
1638 dlm_get_lock_cookie_seq(c
));
1641 BUG_ON(lock
->ml
.node
!= ml
->node
);
1643 /* see NOTE above about why we do not update
1644 * to match the master here */
1646 /* move the lock to its proper place */
1647 /* do not alter lock refcount. switching lists. */
1648 list_move_tail(&lock
->list
, queue
);
1649 spin_unlock(&res
->spinlock
);
1651 mlog(0, "just reordered a local lock!\n");
1655 /* lock is for another node. */
1656 newlock
= dlm_new_lock(ml
->type
, ml
->node
,
1657 be64_to_cpu(ml
->cookie
), NULL
);
1662 lksb
= newlock
->lksb
;
1663 dlm_lock_attach_lockres(newlock
, res
);
1665 if (ml
->convert_type
!= LKM_IVMODE
) {
1666 BUG_ON(queue
!= &res
->converting
);
1667 newlock
->ml
.convert_type
= ml
->convert_type
;
1669 lksb
->flags
|= (ml
->flags
&
1670 (DLM_LKSB_PUT_LVB
|DLM_LKSB_GET_LVB
));
1672 if (!dlm_lvb_is_empty(mres
->lvb
)) {
1673 if (lksb
->flags
& DLM_LKSB_PUT_LVB
) {
1674 /* other node was trying to update
1675 * lvb when node died. recreate the
1676 * lksb with the updated lvb. */
1677 memcpy(lksb
->lvb
, mres
->lvb
, DLM_LVB_LEN
);
1679 /* otherwise, the node is sending its
1680 * most recent valid lvb info */
1681 BUG_ON(ml
->type
!= LKM_EXMODE
&&
1682 ml
->type
!= LKM_PRMODE
);
1683 if (!dlm_lvb_is_empty(res
->lvb
) &&
1684 (ml
->type
== LKM_EXMODE
||
1685 memcmp(res
->lvb
, mres
->lvb
, DLM_LVB_LEN
))) {
1686 mlog(ML_ERROR
, "received bad lvb!\n");
1687 __dlm_print_one_lock_resource(res
);
1690 memcpy(res
->lvb
, mres
->lvb
, DLM_LVB_LEN
);
1696 * wrt lock queue ordering and recovery:
1697 * 1. order of locks on granted queue is
1699 * 2. order of locks on converting queue is
1700 * LOST with the node death. sorry charlie.
1701 * 3. order of locks on the blocked queue is
1703 * order of locks does not affect integrity, it
1704 * just means that a lock request may get pushed
1705 * back in line as a result of the node death.
1706 * also note that for a given node the lock order
1707 * for its secondary queue locks is preserved
1708 * relative to each other, but clearly *not*
1709 * preserved relative to locks from other nodes.
1712 spin_lock(&res
->spinlock
);
1713 list_for_each_entry(lock
, queue
, list
) {
1714 if (lock
->ml
.cookie
== ml
->cookie
) {
1715 u64 c
= lock
->ml
.cookie
;
1716 mlog(ML_ERROR
, "%s:%.*s: %u:%llu: lock already "
1717 "exists on this lockres!\n", dlm
->name
,
1718 res
->lockname
.len
, res
->lockname
.name
,
1719 dlm_get_lock_cookie_node(c
),
1720 dlm_get_lock_cookie_seq(c
));
1722 mlog(ML_NOTICE
, "sent lock: type=%d, conv=%d, "
1723 "node=%u, cookie=%u:%llu, queue=%d\n",
1724 ml
->type
, ml
->convert_type
, ml
->node
,
1725 dlm_get_lock_cookie_node(ml
->cookie
),
1726 dlm_get_lock_cookie_seq(ml
->cookie
),
1729 __dlm_print_one_lock_resource(res
);
1735 dlm_lock_get(newlock
);
1736 list_add_tail(&newlock
->list
, queue
);
1738 spin_unlock(&res
->spinlock
);
1740 mlog(0, "done running all the locks\n");
1746 dlm_lock_put(newlock
);
1753 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt
*dlm
,
1754 struct dlm_lock_resource
*res
)
1757 struct list_head
*queue
, *iter
, *iter2
;
1758 struct dlm_lock
*lock
;
1760 res
->state
|= DLM_LOCK_RES_RECOVERING
;
1761 if (!list_empty(&res
->recovering
)) {
1763 "Recovering res %s:%.*s, is already on recovery list!\n",
1764 dlm
->name
, res
->lockname
.len
, res
->lockname
.name
);
1765 list_del_init(&res
->recovering
);
1767 /* We need to hold a reference while on the recovery list */
1768 dlm_lockres_get(res
);
1769 list_add_tail(&res
->recovering
, &dlm
->reco
.resources
);
1771 /* find any pending locks and put them back on proper list */
1772 for (i
=DLM_BLOCKED_LIST
; i
>=DLM_GRANTED_LIST
; i
--) {
1773 queue
= dlm_list_idx_to_ptr(res
, i
);
1774 list_for_each_safe(iter
, iter2
, queue
) {
1775 lock
= list_entry (iter
, struct dlm_lock
, list
);
1777 if (lock
->convert_pending
) {
1778 /* move converting lock back to granted */
1779 BUG_ON(i
!= DLM_CONVERTING_LIST
);
1780 mlog(0, "node died with convert pending "
1781 "on %.*s. move back to granted list.\n",
1782 res
->lockname
.len
, res
->lockname
.name
);
1783 dlm_revert_pending_convert(res
, lock
);
1784 lock
->convert_pending
= 0;
1785 } else if (lock
->lock_pending
) {
1786 /* remove pending lock requests completely */
1787 BUG_ON(i
!= DLM_BLOCKED_LIST
);
1788 mlog(0, "node died with lock pending "
1789 "on %.*s. remove from blocked list and skip.\n",
1790 res
->lockname
.len
, res
->lockname
.name
);
1791 /* lock will be floating until ref in
1792 * dlmlock_remote is freed after the network
1793 * call returns. ok for it to not be on any
1794 * list since no ast can be called
1795 * (the master is dead). */
1796 dlm_revert_pending_lock(res
, lock
);
1797 lock
->lock_pending
= 0;
1798 } else if (lock
->unlock_pending
) {
1799 /* if an unlock was in progress, treat as
1800 * if this had completed successfully
1801 * before sending this lock state to the
1802 * new master. note that the dlm_unlock
1803 * call is still responsible for calling
1804 * the unlockast. that will happen after
1805 * the network call times out. for now,
1806 * just move lists to prepare the new
1807 * recovery master. */
1808 BUG_ON(i
!= DLM_GRANTED_LIST
);
1809 mlog(0, "node died with unlock pending "
1810 "on %.*s. remove from blocked list and skip.\n",
1811 res
->lockname
.len
, res
->lockname
.name
);
1812 dlm_commit_pending_unlock(res
, lock
);
1813 lock
->unlock_pending
= 0;
1814 } else if (lock
->cancel_pending
) {
1815 /* if a cancel was in progress, treat as
1816 * if this had completed successfully
1817 * before sending this lock state to the
1819 BUG_ON(i
!= DLM_CONVERTING_LIST
);
1820 mlog(0, "node died with cancel pending "
1821 "on %.*s. move back to granted list.\n",
1822 res
->lockname
.len
, res
->lockname
.name
);
1823 dlm_commit_pending_cancel(res
, lock
);
1824 lock
->cancel_pending
= 0;
1833 /* removes all recovered locks from the recovery list.
1834 * sets the res->owner to the new master.
1835 * unsets the RECOVERY flag and wakes waiters. */
1836 static void dlm_finish_local_lockres_recovery(struct dlm_ctxt
*dlm
,
1837 u8 dead_node
, u8 new_master
)
1840 struct list_head
*iter
, *iter2
;
1841 struct hlist_node
*hash_iter
;
1842 struct hlist_head
*bucket
;
1844 struct dlm_lock_resource
*res
;
1848 assert_spin_locked(&dlm
->spinlock
);
1850 list_for_each_safe(iter
, iter2
, &dlm
->reco
.resources
) {
1851 res
= list_entry (iter
, struct dlm_lock_resource
, recovering
);
1852 if (res
->owner
== dead_node
) {
1853 list_del_init(&res
->recovering
);
1854 spin_lock(&res
->spinlock
);
1855 dlm_change_lockres_owner(dlm
, res
, new_master
);
1856 res
->state
&= ~DLM_LOCK_RES_RECOVERING
;
1857 if (!__dlm_lockres_unused(res
))
1858 __dlm_dirty_lockres(dlm
, res
);
1859 spin_unlock(&res
->spinlock
);
1861 dlm_lockres_put(res
);
1865 /* this will become unnecessary eventually, but
1866 * for now we need to run the whole hash, clear
1867 * the RECOVERING state and set the owner
1869 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++) {
1870 bucket
= dlm_lockres_hash(dlm
, i
);
1871 hlist_for_each_entry(res
, hash_iter
, bucket
, hash_node
) {
1872 if (res
->state
& DLM_LOCK_RES_RECOVERING
) {
1873 if (res
->owner
== dead_node
) {
1874 mlog(0, "(this=%u) res %.*s owner=%u "
1875 "was not on recovering list, but "
1876 "clearing state anyway\n",
1877 dlm
->node_num
, res
->lockname
.len
,
1878 res
->lockname
.name
, new_master
);
1879 } else if (res
->owner
== dlm
->node_num
) {
1880 mlog(0, "(this=%u) res %.*s owner=%u "
1881 "was not on recovering list, "
1882 "owner is THIS node, clearing\n",
1883 dlm
->node_num
, res
->lockname
.len
,
1884 res
->lockname
.name
, new_master
);
1888 if (!list_empty(&res
->recovering
)) {
1889 mlog(0, "%s:%.*s: lockres was "
1890 "marked RECOVERING, owner=%u\n",
1891 dlm
->name
, res
->lockname
.len
,
1892 res
->lockname
.name
, res
->owner
);
1893 list_del_init(&res
->recovering
);
1894 dlm_lockres_put(res
);
1896 spin_lock(&res
->spinlock
);
1897 dlm_change_lockres_owner(dlm
, res
, new_master
);
1898 res
->state
&= ~DLM_LOCK_RES_RECOVERING
;
1899 if (!__dlm_lockres_unused(res
))
1900 __dlm_dirty_lockres(dlm
, res
);
1901 spin_unlock(&res
->spinlock
);
1908 static inline int dlm_lvb_needs_invalidation(struct dlm_lock
*lock
, int local
)
1911 if (lock
->ml
.type
!= LKM_EXMODE
&&
1912 lock
->ml
.type
!= LKM_PRMODE
)
1914 } else if (lock
->ml
.type
== LKM_EXMODE
)
1919 static void dlm_revalidate_lvb(struct dlm_ctxt
*dlm
,
1920 struct dlm_lock_resource
*res
, u8 dead_node
)
1922 struct list_head
*iter
, *queue
;
1923 struct dlm_lock
*lock
;
1924 int blank_lvb
= 0, local
= 0;
1928 assert_spin_locked(&dlm
->spinlock
);
1929 assert_spin_locked(&res
->spinlock
);
1931 if (res
->owner
== dlm
->node_num
)
1932 /* if this node owned the lockres, and if the dead node
1933 * had an EX when he died, blank out the lvb */
1934 search_node
= dead_node
;
1936 /* if this is a secondary lockres, and we had no EX or PR
1937 * locks granted, we can no longer trust the lvb */
1938 search_node
= dlm
->node_num
;
1939 local
= 1; /* check local state for valid lvb */
1942 for (i
=DLM_GRANTED_LIST
; i
<=DLM_CONVERTING_LIST
; i
++) {
1943 queue
= dlm_list_idx_to_ptr(res
, i
);
1944 list_for_each(iter
, queue
) {
1945 lock
= list_entry (iter
, struct dlm_lock
, list
);
1946 if (lock
->ml
.node
== search_node
) {
1947 if (dlm_lvb_needs_invalidation(lock
, local
)) {
1948 /* zero the lksb lvb and lockres lvb */
1950 memset(lock
->lksb
->lvb
, 0, DLM_LVB_LEN
);
1957 mlog(0, "clearing %.*s lvb, dead node %u had EX\n",
1958 res
->lockname
.len
, res
->lockname
.name
, dead_node
);
1959 memset(res
->lvb
, 0, DLM_LVB_LEN
);
1963 static void dlm_free_dead_locks(struct dlm_ctxt
*dlm
,
1964 struct dlm_lock_resource
*res
, u8 dead_node
)
1966 struct list_head
*iter
, *tmpiter
;
1967 struct dlm_lock
*lock
;
1969 /* this node is the lockres master:
1970 * 1) remove any stale locks for the dead node
1971 * 2) if the dead node had an EX when he died, blank out the lvb
1973 assert_spin_locked(&dlm
->spinlock
);
1974 assert_spin_locked(&res
->spinlock
);
1976 /* TODO: check pending_asts, pending_basts here */
1977 list_for_each_safe(iter
, tmpiter
, &res
->granted
) {
1978 lock
= list_entry (iter
, struct dlm_lock
, list
);
1979 if (lock
->ml
.node
== dead_node
) {
1980 list_del_init(&lock
->list
);
1984 list_for_each_safe(iter
, tmpiter
, &res
->converting
) {
1985 lock
= list_entry (iter
, struct dlm_lock
, list
);
1986 if (lock
->ml
.node
== dead_node
) {
1987 list_del_init(&lock
->list
);
1991 list_for_each_safe(iter
, tmpiter
, &res
->blocked
) {
1992 lock
= list_entry (iter
, struct dlm_lock
, list
);
1993 if (lock
->ml
.node
== dead_node
) {
1994 list_del_init(&lock
->list
);
1999 /* do not kick thread yet */
2000 __dlm_dirty_lockres(dlm
, res
);
2003 /* if this node is the recovery master, and there are no
2004 * locks for a given lockres owned by this node that are in
2005 * either PR or EX mode, zero out the lvb before requesting.
2010 static void dlm_do_local_recovery_cleanup(struct dlm_ctxt
*dlm
, u8 dead_node
)
2012 struct hlist_node
*iter
;
2013 struct dlm_lock_resource
*res
;
2015 struct hlist_head
*bucket
;
2016 struct dlm_lock
*lock
;
2019 /* purge any stale mles */
2020 dlm_clean_master_list(dlm
, dead_node
);
2023 * now clean up all lock resources. there are two rules:
2025 * 1) if the dead node was the master, move the lockres
2026 * to the recovering list. set the RECOVERING flag.
2027 * this lockres needs to be cleaned up before it can
2030 * 2) if this node was the master, remove all locks from
2031 * each of the lockres queues that were owned by the
2032 * dead node. once recovery finishes, the dlm thread
2033 * can be kicked again to see if any ASTs or BASTs
2034 * need to be fired as a result.
2036 for (i
= 0; i
< DLM_HASH_BUCKETS
; i
++) {
2037 bucket
= dlm_lockres_hash(dlm
, i
);
2038 hlist_for_each_entry(res
, iter
, bucket
, hash_node
) {
2039 /* always prune any $RECOVERY entries for dead nodes,
2040 * otherwise hangs can occur during later recovery */
2041 if (dlm_is_recovery_lock(res
->lockname
.name
,
2042 res
->lockname
.len
)) {
2043 spin_lock(&res
->spinlock
);
2044 list_for_each_entry(lock
, &res
->granted
, list
) {
2045 if (lock
->ml
.node
== dead_node
) {
2046 mlog(0, "AHA! there was "
2047 "a $RECOVERY lock for dead "
2049 dead_node
, dlm
->name
);
2050 list_del_init(&lock
->list
);
2055 spin_unlock(&res
->spinlock
);
2058 spin_lock(&res
->spinlock
);
2059 /* zero the lvb if necessary */
2060 dlm_revalidate_lvb(dlm
, res
, dead_node
);
2061 if (res
->owner
== dead_node
)
2062 dlm_move_lockres_to_recovery_list(dlm
, res
);
2063 else if (res
->owner
== dlm
->node_num
) {
2064 dlm_free_dead_locks(dlm
, res
, dead_node
);
2065 __dlm_lockres_calc_usage(dlm
, res
);
2067 spin_unlock(&res
->spinlock
);
2073 static void __dlm_hb_node_down(struct dlm_ctxt
*dlm
, int idx
)
2075 assert_spin_locked(&dlm
->spinlock
);
2077 /* check to see if the node is already considered dead */
2078 if (!test_bit(idx
, dlm
->live_nodes_map
)) {
2079 mlog(0, "for domain %s, node %d is already dead. "
2080 "another node likely did recovery already.\n",
2085 /* check to see if we do not care about this node */
2086 if (!test_bit(idx
, dlm
->domain_map
)) {
2087 /* This also catches the case that we get a node down
2088 * but haven't joined the domain yet. */
2089 mlog(0, "node %u already removed from domain!\n", idx
);
2093 clear_bit(idx
, dlm
->live_nodes_map
);
2095 /* Clean up join state on node death. */
2096 if (dlm
->joining_node
== idx
) {
2097 mlog(0, "Clearing join state for node %u\n", idx
);
2098 __dlm_set_joining_node(dlm
, DLM_LOCK_RES_OWNER_UNKNOWN
);
2101 /* make sure local cleanup occurs before the heartbeat events */
2102 if (!test_bit(idx
, dlm
->recovery_map
))
2103 dlm_do_local_recovery_cleanup(dlm
, idx
);
2105 /* notify anything attached to the heartbeat events */
2106 dlm_hb_event_notify_attached(dlm
, idx
, 0);
2108 mlog(0, "node %u being removed from domain map!\n", idx
);
2109 clear_bit(idx
, dlm
->domain_map
);
2110 /* wake up migration waiters if a node goes down.
2111 * perhaps later we can genericize this for other waiters. */
2112 wake_up(&dlm
->migration_wq
);
2114 if (test_bit(idx
, dlm
->recovery_map
))
2115 mlog(0, "domain %s, node %u already added "
2116 "to recovery map!\n", dlm
->name
, idx
);
2118 set_bit(idx
, dlm
->recovery_map
);
2121 void dlm_hb_node_down_cb(struct o2nm_node
*node
, int idx
, void *data
)
2123 struct dlm_ctxt
*dlm
= data
;
2128 spin_lock(&dlm
->spinlock
);
2129 __dlm_hb_node_down(dlm
, idx
);
2130 spin_unlock(&dlm
->spinlock
);
2135 void dlm_hb_node_up_cb(struct o2nm_node
*node
, int idx
, void *data
)
2137 struct dlm_ctxt
*dlm
= data
;
2142 spin_lock(&dlm
->spinlock
);
2143 set_bit(idx
, dlm
->live_nodes_map
);
2144 /* do NOT notify mle attached to the heartbeat events.
2145 * new nodes are not interesting in mastery until joined. */
2146 spin_unlock(&dlm
->spinlock
);
2151 static void dlm_reco_ast(void *astdata
)
2153 struct dlm_ctxt
*dlm
= astdata
;
2154 mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n",
2155 dlm
->node_num
, dlm
->name
);
2157 static void dlm_reco_bast(void *astdata
, int blocked_type
)
2159 struct dlm_ctxt
*dlm
= astdata
;
2160 mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n",
2161 dlm
->node_num
, dlm
->name
);
2163 static void dlm_reco_unlock_ast(void *astdata
, enum dlm_status st
)
2165 mlog(0, "unlockast for recovery lock fired!\n");
2169 * dlm_pick_recovery_master will continually attempt to use
2170 * dlmlock() on the special "$RECOVERY" lockres with the
2171 * LKM_NOQUEUE flag to get an EX. every thread that enters
2172 * this function on each node racing to become the recovery
2173 * master will not stop attempting this until either:
2174 * a) this node gets the EX (and becomes the recovery master),
2175 * or b) dlm->reco.new_master gets set to some nodenum
2176 * != O2NM_INVALID_NODE_NUM (another node will do the reco).
2177 * so each time a recovery master is needed, the entire cluster
2178 * will sync at this point. if the new master dies, that will
2179 * be detected in dlm_do_recovery */
2180 static int dlm_pick_recovery_master(struct dlm_ctxt
*dlm
)
2182 enum dlm_status ret
;
2183 struct dlm_lockstatus lksb
;
2184 int status
= -EINVAL
;
2186 mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n",
2187 dlm
->name
, jiffies
, dlm
->reco
.dead_node
, dlm
->node_num
);
2189 memset(&lksb
, 0, sizeof(lksb
));
2191 ret
= dlmlock(dlm
, LKM_EXMODE
, &lksb
, LKM_NOQUEUE
|LKM_RECOVERY
,
2192 DLM_RECOVERY_LOCK_NAME
, dlm_reco_ast
, dlm
, dlm_reco_bast
);
2194 mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n",
2195 dlm
->name
, ret
, lksb
.status
);
2197 if (ret
== DLM_NORMAL
) {
2198 mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n",
2199 dlm
->name
, dlm
->node_num
);
2201 /* got the EX lock. check to see if another node
2202 * just became the reco master */
2203 if (dlm_reco_master_ready(dlm
)) {
2204 mlog(0, "%s: got reco EX lock, but %u will "
2205 "do the recovery\n", dlm
->name
,
2206 dlm
->reco
.new_master
);
2211 /* see if recovery was already finished elsewhere */
2212 spin_lock(&dlm
->spinlock
);
2213 if (dlm
->reco
.dead_node
== O2NM_INVALID_NODE_NUM
) {
2215 mlog(0, "%s: got reco EX lock, but "
2216 "node got recovered already\n", dlm
->name
);
2217 if (dlm
->reco
.new_master
!= O2NM_INVALID_NODE_NUM
) {
2218 mlog(ML_ERROR
, "%s: new master is %u "
2219 "but no dead node!\n",
2220 dlm
->name
, dlm
->reco
.new_master
);
2224 spin_unlock(&dlm
->spinlock
);
2227 /* if this node has actually become the recovery master,
2228 * set the master and send the messages to begin recovery */
2230 mlog(0, "%s: dead=%u, this=%u, sending "
2231 "begin_reco now\n", dlm
->name
,
2232 dlm
->reco
.dead_node
, dlm
->node_num
);
2233 status
= dlm_send_begin_reco_message(dlm
,
2234 dlm
->reco
.dead_node
);
2235 /* this always succeeds */
2238 /* set the new_master to this node */
2239 spin_lock(&dlm
->spinlock
);
2240 dlm_set_reco_master(dlm
, dlm
->node_num
);
2241 spin_unlock(&dlm
->spinlock
);
2244 /* recovery lock is a special case. ast will not get fired,
2245 * so just go ahead and unlock it. */
2246 ret
= dlmunlock(dlm
, &lksb
, 0, dlm_reco_unlock_ast
, dlm
);
2247 if (ret
== DLM_DENIED
) {
2248 mlog(0, "got DLM_DENIED, trying LKM_CANCEL\n");
2249 ret
= dlmunlock(dlm
, &lksb
, LKM_CANCEL
, dlm_reco_unlock_ast
, dlm
);
2251 if (ret
!= DLM_NORMAL
) {
2252 /* this would really suck. this could only happen
2253 * if there was a network error during the unlock
2254 * because of node death. this means the unlock
2255 * is actually "done" and the lock structure is
2256 * even freed. we can continue, but only
2257 * because this specific lock name is special. */
2258 mlog(ML_ERROR
, "dlmunlock returned %d\n", ret
);
2260 } else if (ret
== DLM_NOTQUEUED
) {
2261 mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n",
2262 dlm
->name
, dlm
->node_num
);
2263 /* another node is master. wait on
2264 * reco.new_master != O2NM_INVALID_NODE_NUM
2265 * for at most one second */
2266 wait_event_timeout(dlm
->dlm_reco_thread_wq
,
2267 dlm_reco_master_ready(dlm
),
2268 msecs_to_jiffies(1000));
2269 if (!dlm_reco_master_ready(dlm
)) {
2270 mlog(0, "%s: reco master taking awhile\n",
2274 /* another node has informed this one that it is reco master */
2275 mlog(0, "%s: reco master %u is ready to recover %u\n",
2276 dlm
->name
, dlm
->reco
.new_master
, dlm
->reco
.dead_node
);
2279 struct dlm_lock_resource
*res
;
2281 /* dlmlock returned something other than NOTQUEUED or NORMAL */
2282 mlog(ML_ERROR
, "%s: got %s from dlmlock($RECOVERY), "
2283 "lksb.status=%s\n", dlm
->name
, dlm_errname(ret
),
2284 dlm_errname(lksb
.status
));
2285 res
= dlm_lookup_lockres(dlm
, DLM_RECOVERY_LOCK_NAME
,
2286 DLM_RECOVERY_LOCK_NAME_LEN
);
2288 dlm_print_one_lock_resource(res
);
2289 dlm_lockres_put(res
);
2291 mlog(ML_ERROR
, "recovery lock not found\n");
2299 static int dlm_send_begin_reco_message(struct dlm_ctxt
*dlm
, u8 dead_node
)
2301 struct dlm_begin_reco br
;
2303 struct dlm_node_iter iter
;
2307 mlog_entry("%u\n", dead_node
);
2309 mlog(0, "%s: dead node is %u\n", dlm
->name
, dead_node
);
2311 spin_lock(&dlm
->spinlock
);
2312 dlm_node_iter_init(dlm
->domain_map
, &iter
);
2313 spin_unlock(&dlm
->spinlock
);
2315 clear_bit(dead_node
, iter
.node_map
);
2317 memset(&br
, 0, sizeof(br
));
2318 br
.node_idx
= dlm
->node_num
;
2319 br
.dead_node
= dead_node
;
2321 while ((nodenum
= dlm_node_iter_next(&iter
)) >= 0) {
2323 if (nodenum
== dead_node
) {
2324 mlog(0, "not sending begin reco to dead node "
2328 if (nodenum
== dlm
->node_num
) {
2329 mlog(0, "not sending begin reco to self\n");
2334 mlog(0, "attempting to send begin reco msg to %d\n",
2336 ret
= o2net_send_message(DLM_BEGIN_RECO_MSG
, dlm
->key
,
2337 &br
, sizeof(br
), nodenum
, &status
);
2338 /* negative status is handled ok by caller here */
2341 if (dlm_is_host_down(ret
)) {
2342 /* node is down. not involved in recovery
2343 * so just keep going */
2344 mlog(0, "%s: node %u was down when sending "
2345 "begin reco msg (%d)\n", dlm
->name
, nodenum
, ret
);
2349 struct dlm_lock_resource
*res
;
2350 /* this is now a serious problem, possibly ENOMEM
2351 * in the network stack. must retry */
2353 mlog(ML_ERROR
, "begin reco of dlm %s to node %u "
2354 " returned %d\n", dlm
->name
, nodenum
, ret
);
2355 res
= dlm_lookup_lockres(dlm
, DLM_RECOVERY_LOCK_NAME
,
2356 DLM_RECOVERY_LOCK_NAME_LEN
);
2358 dlm_print_one_lock_resource(res
);
2359 dlm_lockres_put(res
);
2361 mlog(ML_ERROR
, "recovery lock not found\n");
2363 /* sleep for a bit in hopes that we can avoid
2373 int dlm_begin_reco_handler(struct o2net_msg
*msg
, u32 len
, void *data
)
2375 struct dlm_ctxt
*dlm
= data
;
2376 struct dlm_begin_reco
*br
= (struct dlm_begin_reco
*)msg
->buf
;
2378 /* ok to return 0, domain has gone away */
2382 mlog(0, "%s: node %u wants to recover node %u (%u:%u)\n",
2383 dlm
->name
, br
->node_idx
, br
->dead_node
,
2384 dlm
->reco
.dead_node
, dlm
->reco
.new_master
);
2386 dlm_fire_domain_eviction_callbacks(dlm
, br
->dead_node
);
2388 spin_lock(&dlm
->spinlock
);
2389 if (dlm
->reco
.new_master
!= O2NM_INVALID_NODE_NUM
) {
2390 if (test_bit(dlm
->reco
.new_master
, dlm
->recovery_map
)) {
2391 mlog(0, "%s: new_master %u died, changing "
2392 "to %u\n", dlm
->name
, dlm
->reco
.new_master
,
2395 mlog(0, "%s: new_master %u NOT DEAD, changing "
2396 "to %u\n", dlm
->name
, dlm
->reco
.new_master
,
2398 /* may not have seen the new master as dead yet */
2401 if (dlm
->reco
.dead_node
!= O2NM_INVALID_NODE_NUM
) {
2402 mlog(ML_NOTICE
, "%s: dead_node previously set to %u, "
2403 "node %u changing it to %u\n", dlm
->name
,
2404 dlm
->reco
.dead_node
, br
->node_idx
, br
->dead_node
);
2406 dlm_set_reco_master(dlm
, br
->node_idx
);
2407 dlm_set_reco_dead_node(dlm
, br
->dead_node
);
2408 if (!test_bit(br
->dead_node
, dlm
->recovery_map
)) {
2409 mlog(0, "recovery master %u sees %u as dead, but this "
2410 "node has not yet. marking %u as dead\n",
2411 br
->node_idx
, br
->dead_node
, br
->dead_node
);
2412 if (!test_bit(br
->dead_node
, dlm
->domain_map
) ||
2413 !test_bit(br
->dead_node
, dlm
->live_nodes_map
))
2414 mlog(0, "%u not in domain/live_nodes map "
2415 "so setting it in reco map manually\n",
2417 /* force the recovery cleanup in __dlm_hb_node_down
2418 * both of these will be cleared in a moment */
2419 set_bit(br
->dead_node
, dlm
->domain_map
);
2420 set_bit(br
->dead_node
, dlm
->live_nodes_map
);
2421 __dlm_hb_node_down(dlm
, br
->dead_node
);
2423 spin_unlock(&dlm
->spinlock
);
2425 dlm_kick_recovery_thread(dlm
);
2427 mlog(0, "%s: recovery started by node %u, for %u (%u:%u)\n",
2428 dlm
->name
, br
->node_idx
, br
->dead_node
,
2429 dlm
->reco
.dead_node
, dlm
->reco
.new_master
);
2435 static int dlm_send_finalize_reco_message(struct dlm_ctxt
*dlm
)
2438 struct dlm_finalize_reco fr
;
2439 struct dlm_node_iter iter
;
2443 mlog(0, "finishing recovery for node %s:%u\n",
2444 dlm
->name
, dlm
->reco
.dead_node
);
2446 spin_lock(&dlm
->spinlock
);
2447 dlm_node_iter_init(dlm
->domain_map
, &iter
);
2448 spin_unlock(&dlm
->spinlock
);
2450 memset(&fr
, 0, sizeof(fr
));
2451 fr
.node_idx
= dlm
->node_num
;
2452 fr
.dead_node
= dlm
->reco
.dead_node
;
2454 while ((nodenum
= dlm_node_iter_next(&iter
)) >= 0) {
2455 if (nodenum
== dlm
->node_num
)
2457 ret
= o2net_send_message(DLM_FINALIZE_RECO_MSG
, dlm
->key
,
2458 &fr
, sizeof(fr
), nodenum
, &status
);
2461 if (dlm_is_host_down(ret
)) {
2462 /* this has no effect on this recovery
2463 * session, so set the status to zero to
2464 * finish out the last recovery */
2465 mlog(ML_ERROR
, "node %u went down after this "
2466 "node finished recovery.\n", nodenum
);
2479 int dlm_finalize_reco_handler(struct o2net_msg
*msg
, u32 len
, void *data
)
2481 struct dlm_ctxt
*dlm
= data
;
2482 struct dlm_finalize_reco
*fr
= (struct dlm_finalize_reco
*)msg
->buf
;
2484 /* ok to return 0, domain has gone away */
2488 mlog(0, "%s: node %u finalizing recovery of node %u (%u:%u)\n",
2489 dlm
->name
, fr
->node_idx
, fr
->dead_node
,
2490 dlm
->reco
.dead_node
, dlm
->reco
.new_master
);
2492 spin_lock(&dlm
->spinlock
);
2494 if (dlm
->reco
.new_master
!= fr
->node_idx
) {
2495 mlog(ML_ERROR
, "node %u sent recovery finalize msg, but node "
2496 "%u is supposed to be the new master, dead=%u\n",
2497 fr
->node_idx
, dlm
->reco
.new_master
, fr
->dead_node
);
2500 if (dlm
->reco
.dead_node
!= fr
->dead_node
) {
2501 mlog(ML_ERROR
, "node %u sent recovery finalize msg for dead "
2502 "node %u, but node %u is supposed to be dead\n",
2503 fr
->node_idx
, fr
->dead_node
, dlm
->reco
.dead_node
);
2507 dlm_finish_local_lockres_recovery(dlm
, fr
->dead_node
, fr
->node_idx
);
2509 spin_unlock(&dlm
->spinlock
);
2511 dlm_reset_recovery(dlm
);
2513 dlm_kick_recovery_thread(dlm
);
2514 mlog(0, "%s: recovery done, reco master was %u, dead now %u, master now %u\n",
2515 dlm
->name
, fr
->node_idx
, dlm
->reco
.dead_node
, dlm
->reco
.new_master
);