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authorGreg Kroah-Hartman <gregkh@suse.de>2006-01-06 15:59:59 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2006-01-06 15:59:59 -0500
commitccf18968b1bbc2fb117190a1984ac2a826dac228 (patch)
tree7bc8fbf5722aecf1e84fa50c31c657864cba1daa /fs/ocfs2/dlm/dlmrecovery.c
parente91c021c487110386a07facd0396e6c3b7cf9c1f (diff)
parentd99cf9d679a520d67f81d805b7cb91c68e1847f0 (diff)
Merge ../torvalds-2.6/
Diffstat (limited to 'fs/ocfs2/dlm/dlmrecovery.c')
-rw-r--r--fs/ocfs2/dlm/dlmrecovery.c2132
1 files changed, 2132 insertions, 0 deletions
diff --git a/fs/ocfs2/dlm/dlmrecovery.c b/fs/ocfs2/dlm/dlmrecovery.c
new file mode 100644
index 000000000000..0c8eb1093f00
--- /dev/null
+++ b/fs/ocfs2/dlm/dlmrecovery.c
@@ -0,0 +1,2132 @@
1/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmrecovery.c
5 *
6 * recovery stuff
7 *
8 * Copyright (C) 2004 Oracle. All rights reserved.
9 *
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.
14 *
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.
19 *
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.
24 *
25 */
26
27
28#include <linux/module.h>
29#include <linux/fs.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
43
44#include "cluster/heartbeat.h"
45#include "cluster/nodemanager.h"
46#include "cluster/tcp.h"
47
48#include "dlmapi.h"
49#include "dlmcommon.h"
50#include "dlmdomain.h"
51
52#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY)
53#include "cluster/masklog.h"
54
55static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node);
56
57static int dlm_recovery_thread(void *data);
58void dlm_complete_recovery_thread(struct dlm_ctxt *dlm);
59int dlm_launch_recovery_thread(struct dlm_ctxt *dlm);
60static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm);
61static int dlm_do_recovery(struct dlm_ctxt *dlm);
62
63static int dlm_pick_recovery_master(struct dlm_ctxt *dlm);
64static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node);
65static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node);
66static int dlm_request_all_locks(struct dlm_ctxt *dlm,
67 u8 request_from, u8 dead_node);
68static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node);
69
70static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res);
71static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
72 const char *lockname, int namelen,
73 int total_locks, u64 cookie,
74 u8 flags, u8 master);
75static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
76 struct dlm_migratable_lockres *mres,
77 u8 send_to,
78 struct dlm_lock_resource *res,
79 int total_locks);
80static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
81 struct dlm_lock_resource *res,
82 u8 *real_master);
83static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
84 struct dlm_lock_resource *res,
85 struct dlm_migratable_lockres *mres);
86static int dlm_do_master_requery(struct dlm_ctxt *dlm,
87 struct dlm_lock_resource *res,
88 u8 nodenum, u8 *real_master);
89static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm);
90static int dlm_send_all_done_msg(struct dlm_ctxt *dlm,
91 u8 dead_node, u8 send_to);
92static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node);
93static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
94 struct list_head *list, u8 dead_node);
95static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
96 u8 dead_node, u8 new_master);
97static void dlm_reco_ast(void *astdata);
98static void dlm_reco_bast(void *astdata, int blocked_type);
99static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st);
100static void dlm_request_all_locks_worker(struct dlm_work_item *item,
101 void *data);
102static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data);
103
104static u64 dlm_get_next_mig_cookie(void);
105
106static spinlock_t dlm_reco_state_lock = SPIN_LOCK_UNLOCKED;
107static spinlock_t dlm_mig_cookie_lock = SPIN_LOCK_UNLOCKED;
108static u64 dlm_mig_cookie = 1;
109
110static u64 dlm_get_next_mig_cookie(void)
111{
112 u64 c;
113 spin_lock(&dlm_mig_cookie_lock);
114 c = dlm_mig_cookie;
115 if (dlm_mig_cookie == (~0ULL))
116 dlm_mig_cookie = 1;
117 else
118 dlm_mig_cookie++;
119 spin_unlock(&dlm_mig_cookie_lock);
120 return c;
121}
122
123static inline void dlm_reset_recovery(struct dlm_ctxt *dlm)
124{
125 spin_lock(&dlm->spinlock);
126 clear_bit(dlm->reco.dead_node, dlm->recovery_map);
127 dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
128 dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
129 spin_unlock(&dlm->spinlock);
130}
131
132/* Worker function used during recovery. */
133void dlm_dispatch_work(void *data)
134{
135 struct dlm_ctxt *dlm = (struct dlm_ctxt *)data;
136 LIST_HEAD(tmp_list);
137 struct list_head *iter, *iter2;
138 struct dlm_work_item *item;
139 dlm_workfunc_t *workfunc;
140
141 spin_lock(&dlm->work_lock);
142 list_splice_init(&dlm->work_list, &tmp_list);
143 spin_unlock(&dlm->work_lock);
144
145 list_for_each_safe(iter, iter2, &tmp_list) {
146 item = list_entry(iter, struct dlm_work_item, list);
147 workfunc = item->func;
148 list_del_init(&item->list);
149
150 /* already have ref on dlm to avoid having
151 * it disappear. just double-check. */
152 BUG_ON(item->dlm != dlm);
153
154 /* this is allowed to sleep and
155 * call network stuff */
156 workfunc(item, item->data);
157
158 dlm_put(dlm);
159 kfree(item);
160 }
161}
162
163/*
164 * RECOVERY THREAD
165 */
166
167static void dlm_kick_recovery_thread(struct dlm_ctxt *dlm)
168{
169 /* wake the recovery thread
170 * this will wake the reco thread in one of three places
171 * 1) sleeping with no recovery happening
172 * 2) sleeping with recovery mastered elsewhere
173 * 3) recovery mastered here, waiting on reco data */
174
175 wake_up(&dlm->dlm_reco_thread_wq);
176}
177
178/* Launch the recovery thread */
179int dlm_launch_recovery_thread(struct dlm_ctxt *dlm)
180{
181 mlog(0, "starting dlm recovery thread...\n");
182
183 dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm,
184 "dlm_reco_thread");
185 if (IS_ERR(dlm->dlm_reco_thread_task)) {
186 mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task));
187 dlm->dlm_reco_thread_task = NULL;
188 return -EINVAL;
189 }
190
191 return 0;
192}
193
194void dlm_complete_recovery_thread(struct dlm_ctxt *dlm)
195{
196 if (dlm->dlm_reco_thread_task) {
197 mlog(0, "waiting for dlm recovery thread to exit\n");
198 kthread_stop(dlm->dlm_reco_thread_task);
199 dlm->dlm_reco_thread_task = NULL;
200 }
201}
202
203
204
205/*
206 * this is lame, but here's how recovery works...
207 * 1) all recovery threads cluster wide will work on recovering
208 * ONE node at a time
209 * 2) negotiate who will take over all the locks for the dead node.
210 * thats right... ALL the locks.
211 * 3) once a new master is chosen, everyone scans all locks
212 * and moves aside those mastered by the dead guy
213 * 4) each of these locks should be locked until recovery is done
214 * 5) the new master collects up all of secondary lock queue info
215 * one lock at a time, forcing each node to communicate back
216 * before continuing
217 * 6) each secondary lock queue responds with the full known lock info
218 * 7) once the new master has run all its locks, it sends a ALLDONE!
219 * message to everyone
220 * 8) upon receiving this message, the secondary queue node unlocks
221 * and responds to the ALLDONE
222 * 9) once the new master gets responses from everyone, he unlocks
223 * everything and recovery for this dead node is done
224 *10) go back to 2) while there are still dead nodes
225 *
226 */
227
228
229#define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000)
230
231static int dlm_recovery_thread(void *data)
232{
233 int status;
234 struct dlm_ctxt *dlm = data;
235 unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS);
236
237 mlog(0, "dlm thread running for %s...\n", dlm->name);
238
239 while (!kthread_should_stop()) {
240 if (dlm_joined(dlm)) {
241 status = dlm_do_recovery(dlm);
242 if (status == -EAGAIN) {
243 /* do not sleep, recheck immediately. */
244 continue;
245 }
246 if (status < 0)
247 mlog_errno(status);
248 }
249
250 wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
251 kthread_should_stop(),
252 timeout);
253 }
254
255 mlog(0, "quitting DLM recovery thread\n");
256 return 0;
257}
258
259/* callers of the top-level api calls (dlmlock/dlmunlock) should
260 * block on the dlm->reco.event when recovery is in progress.
261 * the dlm recovery thread will set this state when it begins
262 * recovering a dead node (as the new master or not) and clear
263 * the state and wake as soon as all affected lock resources have
264 * been marked with the RECOVERY flag */
265static int dlm_in_recovery(struct dlm_ctxt *dlm)
266{
267 int in_recovery;
268 spin_lock(&dlm->spinlock);
269 in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
270 spin_unlock(&dlm->spinlock);
271 return in_recovery;
272}
273
274
275void dlm_wait_for_recovery(struct dlm_ctxt *dlm)
276{
277 wait_event(dlm->reco.event, !dlm_in_recovery(dlm));
278}
279
280static void dlm_begin_recovery(struct dlm_ctxt *dlm)
281{
282 spin_lock(&dlm->spinlock);
283 BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
284 dlm->reco.state |= DLM_RECO_STATE_ACTIVE;
285 spin_unlock(&dlm->spinlock);
286}
287
288static void dlm_end_recovery(struct dlm_ctxt *dlm)
289{
290 spin_lock(&dlm->spinlock);
291 BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE));
292 dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE;
293 spin_unlock(&dlm->spinlock);
294 wake_up(&dlm->reco.event);
295}
296
297static int dlm_do_recovery(struct dlm_ctxt *dlm)
298{
299 int status = 0;
300
301 spin_lock(&dlm->spinlock);
302
303 /* check to see if the new master has died */
304 if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM &&
305 test_bit(dlm->reco.new_master, dlm->recovery_map)) {
306 mlog(0, "new master %u died while recovering %u!\n",
307 dlm->reco.new_master, dlm->reco.dead_node);
308 /* unset the new_master, leave dead_node */
309 dlm->reco.new_master = O2NM_INVALID_NODE_NUM;
310 }
311
312 /* select a target to recover */
313 if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
314 int bit;
315
316 bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES+1, 0);
317 if (bit >= O2NM_MAX_NODES || bit < 0)
318 dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
319 else
320 dlm->reco.dead_node = bit;
321 } else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) {
322 /* BUG? */
323 mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n",
324 dlm->reco.dead_node);
325 dlm->reco.dead_node = O2NM_INVALID_NODE_NUM;
326 }
327
328 if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
329 // mlog(0, "nothing to recover! sleeping now!\n");
330 spin_unlock(&dlm->spinlock);
331 /* return to main thread loop and sleep. */
332 return 0;
333 }
334 mlog(0, "recovery thread found node %u in the recovery map!\n",
335 dlm->reco.dead_node);
336 spin_unlock(&dlm->spinlock);
337
338 /* take write barrier */
339 /* (stops the list reshuffling thread, proxy ast handling) */
340 dlm_begin_recovery(dlm);
341
342 if (dlm->reco.new_master == dlm->node_num)
343 goto master_here;
344
345 if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
346 /* choose a new master */
347 if (!dlm_pick_recovery_master(dlm)) {
348 /* already notified everyone. go. */
349 dlm->reco.new_master = dlm->node_num;
350 goto master_here;
351 }
352 mlog(0, "another node will master this recovery session.\n");
353 }
354 mlog(0, "dlm=%s, new_master=%u, this node=%u, dead_node=%u\n",
355 dlm->name, dlm->reco.new_master,
356 dlm->node_num, dlm->reco.dead_node);
357
358 /* it is safe to start everything back up here
359 * because all of the dead node's lock resources
360 * have been marked as in-recovery */
361 dlm_end_recovery(dlm);
362
363 /* sleep out in main dlm_recovery_thread loop. */
364 return 0;
365
366master_here:
367 mlog(0, "mastering recovery of %s:%u here(this=%u)!\n",
368 dlm->name, dlm->reco.dead_node, dlm->node_num);
369
370 status = dlm_remaster_locks(dlm, dlm->reco.dead_node);
371 if (status < 0) {
372 mlog(ML_ERROR, "error %d remastering locks for node %u, "
373 "retrying.\n", status, dlm->reco.dead_node);
374 } else {
375 /* success! see if any other nodes need recovery */
376 dlm_reset_recovery(dlm);
377 }
378 dlm_end_recovery(dlm);
379
380 /* continue and look for another dead node */
381 return -EAGAIN;
382}
383
384static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
385{
386 int status = 0;
387 struct dlm_reco_node_data *ndata;
388 struct list_head *iter;
389 int all_nodes_done;
390 int destroy = 0;
391 int pass = 0;
392
393 status = dlm_init_recovery_area(dlm, dead_node);
394 if (status < 0)
395 goto leave;
396
397 /* safe to access the node data list without a lock, since this
398 * process is the only one to change the list */
399 list_for_each(iter, &dlm->reco.node_data) {
400 ndata = list_entry (iter, struct dlm_reco_node_data, list);
401 BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT);
402 ndata->state = DLM_RECO_NODE_DATA_REQUESTING;
403
404 mlog(0, "requesting lock info from node %u\n",
405 ndata->node_num);
406
407 if (ndata->node_num == dlm->node_num) {
408 ndata->state = DLM_RECO_NODE_DATA_DONE;
409 continue;
410 }
411
412 status = dlm_request_all_locks(dlm, ndata->node_num, dead_node);
413 if (status < 0) {
414 mlog_errno(status);
415 if (dlm_is_host_down(status))
416 ndata->state = DLM_RECO_NODE_DATA_DEAD;
417 else {
418 destroy = 1;
419 goto leave;
420 }
421 }
422
423 switch (ndata->state) {
424 case DLM_RECO_NODE_DATA_INIT:
425 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
426 case DLM_RECO_NODE_DATA_REQUESTED:
427 BUG();
428 break;
429 case DLM_RECO_NODE_DATA_DEAD:
430 mlog(0, "node %u died after requesting "
431 "recovery info for node %u\n",
432 ndata->node_num, dead_node);
433 // start all over
434 destroy = 1;
435 status = -EAGAIN;
436 goto leave;
437 case DLM_RECO_NODE_DATA_REQUESTING:
438 ndata->state = DLM_RECO_NODE_DATA_REQUESTED;
439 mlog(0, "now receiving recovery data from "
440 "node %u for dead node %u\n",
441 ndata->node_num, dead_node);
442 break;
443 case DLM_RECO_NODE_DATA_RECEIVING:
444 mlog(0, "already receiving recovery data from "
445 "node %u for dead node %u\n",
446 ndata->node_num, dead_node);
447 break;
448 case DLM_RECO_NODE_DATA_DONE:
449 mlog(0, "already DONE receiving recovery data "
450 "from node %u for dead node %u\n",
451 ndata->node_num, dead_node);
452 break;
453 }
454 }
455
456 mlog(0, "done requesting all lock info\n");
457
458 /* nodes should be sending reco data now
459 * just need to wait */
460
461 while (1) {
462 /* check all the nodes now to see if we are
463 * done, or if anyone died */
464 all_nodes_done = 1;
465 spin_lock(&dlm_reco_state_lock);
466 list_for_each(iter, &dlm->reco.node_data) {
467 ndata = list_entry (iter, struct dlm_reco_node_data, list);
468
469 mlog(0, "checking recovery state of node %u\n",
470 ndata->node_num);
471 switch (ndata->state) {
472 case DLM_RECO_NODE_DATA_INIT:
473 case DLM_RECO_NODE_DATA_REQUESTING:
474 mlog(ML_ERROR, "bad ndata state for "
475 "node %u: state=%d\n",
476 ndata->node_num, ndata->state);
477 BUG();
478 break;
479 case DLM_RECO_NODE_DATA_DEAD:
480 mlog(0, "node %u died after "
481 "requesting recovery info for "
482 "node %u\n", ndata->node_num,
483 dead_node);
484 spin_unlock(&dlm_reco_state_lock);
485 // start all over
486 destroy = 1;
487 status = -EAGAIN;
488 goto leave;
489 case DLM_RECO_NODE_DATA_RECEIVING:
490 case DLM_RECO_NODE_DATA_REQUESTED:
491 all_nodes_done = 0;
492 break;
493 case DLM_RECO_NODE_DATA_DONE:
494 break;
495 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
496 break;
497 }
498 }
499 spin_unlock(&dlm_reco_state_lock);
500
501 mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass,
502 all_nodes_done?"yes":"no");
503 if (all_nodes_done) {
504 int ret;
505
506 /* all nodes are now in DLM_RECO_NODE_DATA_DONE state
507 * just send a finalize message to everyone and
508 * clean up */
509 mlog(0, "all nodes are done! send finalize\n");
510 ret = dlm_send_finalize_reco_message(dlm);
511 if (ret < 0)
512 mlog_errno(ret);
513
514 spin_lock(&dlm->spinlock);
515 dlm_finish_local_lockres_recovery(dlm, dead_node,
516 dlm->node_num);
517 spin_unlock(&dlm->spinlock);
518 mlog(0, "should be done with recovery!\n");
519
520 mlog(0, "finishing recovery of %s at %lu, "
521 "dead=%u, this=%u, new=%u\n", dlm->name,
522 jiffies, dlm->reco.dead_node,
523 dlm->node_num, dlm->reco.new_master);
524 destroy = 1;
525 status = ret;
526 /* rescan everything marked dirty along the way */
527 dlm_kick_thread(dlm, NULL);
528 break;
529 }
530 /* wait to be signalled, with periodic timeout
531 * to check for node death */
532 wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
533 kthread_should_stop(),
534 msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS));
535
536 }
537
538leave:
539 if (destroy)
540 dlm_destroy_recovery_area(dlm, dead_node);
541
542 mlog_exit(status);
543 return status;
544}
545
546static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
547{
548 int num=0;
549 struct dlm_reco_node_data *ndata;
550
551 spin_lock(&dlm->spinlock);
552 memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map));
553 /* nodes can only be removed (by dying) after dropping
554 * this lock, and death will be trapped later, so this should do */
555 spin_unlock(&dlm->spinlock);
556
557 while (1) {
558 num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num);
559 if (num >= O2NM_MAX_NODES) {
560 break;
561 }
562 BUG_ON(num == dead_node);
563
564 ndata = kcalloc(1, sizeof(*ndata), GFP_KERNEL);
565 if (!ndata) {
566 dlm_destroy_recovery_area(dlm, dead_node);
567 return -ENOMEM;
568 }
569 ndata->node_num = num;
570 ndata->state = DLM_RECO_NODE_DATA_INIT;
571 spin_lock(&dlm_reco_state_lock);
572 list_add_tail(&ndata->list, &dlm->reco.node_data);
573 spin_unlock(&dlm_reco_state_lock);
574 num++;
575 }
576
577 return 0;
578}
579
580static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
581{
582 struct list_head *iter, *iter2;
583 struct dlm_reco_node_data *ndata;
584 LIST_HEAD(tmplist);
585
586 spin_lock(&dlm_reco_state_lock);
587 list_splice_init(&dlm->reco.node_data, &tmplist);
588 spin_unlock(&dlm_reco_state_lock);
589
590 list_for_each_safe(iter, iter2, &tmplist) {
591 ndata = list_entry (iter, struct dlm_reco_node_data, list);
592 list_del_init(&ndata->list);
593 kfree(ndata);
594 }
595}
596
597static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from,
598 u8 dead_node)
599{
600 struct dlm_lock_request lr;
601 enum dlm_status ret;
602
603 mlog(0, "\n");
604
605
606 mlog(0, "dlm_request_all_locks: dead node is %u, sending request "
607 "to %u\n", dead_node, request_from);
608
609 memset(&lr, 0, sizeof(lr));
610 lr.node_idx = dlm->node_num;
611 lr.dead_node = dead_node;
612
613 // send message
614 ret = DLM_NOLOCKMGR;
615 ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key,
616 &lr, sizeof(lr), request_from, NULL);
617
618 /* negative status is handled by caller */
619 if (ret < 0)
620 mlog_errno(ret);
621
622 // return from here, then
623 // sleep until all received or error
624 return ret;
625
626}
627
628int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data)
629{
630 struct dlm_ctxt *dlm = data;
631 struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf;
632 char *buf = NULL;
633 struct dlm_work_item *item = NULL;
634
635 if (!dlm_grab(dlm))
636 return -EINVAL;
637
638 BUG_ON(lr->dead_node != dlm->reco.dead_node);
639
640 item = kcalloc(1, sizeof(*item), GFP_KERNEL);
641 if (!item) {
642 dlm_put(dlm);
643 return -ENOMEM;
644 }
645
646 /* this will get freed by dlm_request_all_locks_worker */
647 buf = (char *) __get_free_page(GFP_KERNEL);
648 if (!buf) {
649 kfree(item);
650 dlm_put(dlm);
651 return -ENOMEM;
652 }
653
654 /* queue up work for dlm_request_all_locks_worker */
655 dlm_grab(dlm); /* get an extra ref for the work item */
656 dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf);
657 item->u.ral.reco_master = lr->node_idx;
658 item->u.ral.dead_node = lr->dead_node;
659 spin_lock(&dlm->work_lock);
660 list_add_tail(&item->list, &dlm->work_list);
661 spin_unlock(&dlm->work_lock);
662 schedule_work(&dlm->dispatched_work);
663
664 dlm_put(dlm);
665 return 0;
666}
667
668static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
669{
670 struct dlm_migratable_lockres *mres;
671 struct dlm_lock_resource *res;
672 struct dlm_ctxt *dlm;
673 LIST_HEAD(resources);
674 struct list_head *iter;
675 int ret;
676 u8 dead_node, reco_master;
677
678 dlm = item->dlm;
679 dead_node = item->u.ral.dead_node;
680 reco_master = item->u.ral.reco_master;
681 BUG_ON(dead_node != dlm->reco.dead_node);
682 BUG_ON(reco_master != dlm->reco.new_master);
683
684 mres = (struct dlm_migratable_lockres *)data;
685
686 /* lock resources should have already been moved to the
687 * dlm->reco.resources list. now move items from that list
688 * to a temp list if the dead owner matches. note that the
689 * whole cluster recovers only one node at a time, so we
690 * can safely move UNKNOWN lock resources for each recovery
691 * session. */
692 dlm_move_reco_locks_to_list(dlm, &resources, dead_node);
693
694 /* now we can begin blasting lockreses without the dlm lock */
695 list_for_each(iter, &resources) {
696 res = list_entry (iter, struct dlm_lock_resource, recovering);
697 ret = dlm_send_one_lockres(dlm, res, mres, reco_master,
698 DLM_MRES_RECOVERY);
699 if (ret < 0)
700 mlog_errno(ret);
701 }
702
703 /* move the resources back to the list */
704 spin_lock(&dlm->spinlock);
705 list_splice_init(&resources, &dlm->reco.resources);
706 spin_unlock(&dlm->spinlock);
707
708 ret = dlm_send_all_done_msg(dlm, dead_node, reco_master);
709 if (ret < 0)
710 mlog_errno(ret);
711
712 free_page((unsigned long)data);
713}
714
715
716static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to)
717{
718 int ret, tmpret;
719 struct dlm_reco_data_done done_msg;
720
721 memset(&done_msg, 0, sizeof(done_msg));
722 done_msg.node_idx = dlm->node_num;
723 done_msg.dead_node = dead_node;
724 mlog(0, "sending DATA DONE message to %u, "
725 "my node=%u, dead node=%u\n", send_to, done_msg.node_idx,
726 done_msg.dead_node);
727
728 ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg,
729 sizeof(done_msg), send_to, &tmpret);
730 /* negative status is ignored by the caller */
731 if (ret >= 0)
732 ret = tmpret;
733 return ret;
734}
735
736
737int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data)
738{
739 struct dlm_ctxt *dlm = data;
740 struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf;
741 struct list_head *iter;
742 struct dlm_reco_node_data *ndata = NULL;
743 int ret = -EINVAL;
744
745 if (!dlm_grab(dlm))
746 return -EINVAL;
747
748 mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, "
749 "node_idx=%u, this node=%u\n", done->dead_node,
750 dlm->reco.dead_node, done->node_idx, dlm->node_num);
751 BUG_ON(done->dead_node != dlm->reco.dead_node);
752
753 spin_lock(&dlm_reco_state_lock);
754 list_for_each(iter, &dlm->reco.node_data) {
755 ndata = list_entry (iter, struct dlm_reco_node_data, list);
756 if (ndata->node_num != done->node_idx)
757 continue;
758
759 switch (ndata->state) {
760 case DLM_RECO_NODE_DATA_INIT:
761 case DLM_RECO_NODE_DATA_DEAD:
762 case DLM_RECO_NODE_DATA_DONE:
763 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
764 mlog(ML_ERROR, "bad ndata state for node %u:"
765 " state=%d\n", ndata->node_num,
766 ndata->state);
767 BUG();
768 break;
769 case DLM_RECO_NODE_DATA_RECEIVING:
770 case DLM_RECO_NODE_DATA_REQUESTED:
771 case DLM_RECO_NODE_DATA_REQUESTING:
772 mlog(0, "node %u is DONE sending "
773 "recovery data!\n",
774 ndata->node_num);
775
776 ndata->state = DLM_RECO_NODE_DATA_DONE;
777 ret = 0;
778 break;
779 }
780 }
781 spin_unlock(&dlm_reco_state_lock);
782
783 /* wake the recovery thread, some node is done */
784 if (!ret)
785 dlm_kick_recovery_thread(dlm);
786
787 if (ret < 0)
788 mlog(ML_ERROR, "failed to find recovery node data for node "
789 "%u\n", done->node_idx);
790 dlm_put(dlm);
791
792 mlog(0, "leaving reco data done handler, ret=%d\n", ret);
793 return ret;
794}
795
796static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
797 struct list_head *list,
798 u8 dead_node)
799{
800 struct dlm_lock_resource *res;
801 struct list_head *iter, *iter2;
802
803 spin_lock(&dlm->spinlock);
804 list_for_each_safe(iter, iter2, &dlm->reco.resources) {
805 res = list_entry (iter, struct dlm_lock_resource, recovering);
806 if (dlm_is_recovery_lock(res->lockname.name,
807 res->lockname.len))
808 continue;
809 if (res->owner == dead_node) {
810 mlog(0, "found lockres owned by dead node while "
811 "doing recovery for node %u. sending it.\n",
812 dead_node);
813 list_del_init(&res->recovering);
814 list_add_tail(&res->recovering, list);
815 } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
816 mlog(0, "found UNKNOWN owner while doing recovery "
817 "for node %u. sending it.\n", dead_node);
818 list_del_init(&res->recovering);
819 list_add_tail(&res->recovering, list);
820 }
821 }
822 spin_unlock(&dlm->spinlock);
823}
824
825static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res)
826{
827 int total_locks = 0;
828 struct list_head *iter, *queue = &res->granted;
829 int i;
830
831 for (i=0; i<3; i++) {
832 list_for_each(iter, queue)
833 total_locks++;
834 queue++;
835 }
836 return total_locks;
837}
838
839
840static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
841 struct dlm_migratable_lockres *mres,
842 u8 send_to,
843 struct dlm_lock_resource *res,
844 int total_locks)
845{
846 u64 mig_cookie = be64_to_cpu(mres->mig_cookie);
847 int mres_total_locks = be32_to_cpu(mres->total_locks);
848 int sz, ret = 0, status = 0;
849 u8 orig_flags = mres->flags,
850 orig_master = mres->master;
851
852 BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS);
853 if (!mres->num_locks)
854 return 0;
855
856 sz = sizeof(struct dlm_migratable_lockres) +
857 (mres->num_locks * sizeof(struct dlm_migratable_lock));
858
859 /* add an all-done flag if we reached the last lock */
860 orig_flags = mres->flags;
861 BUG_ON(total_locks > mres_total_locks);
862 if (total_locks == mres_total_locks)
863 mres->flags |= DLM_MRES_ALL_DONE;
864
865 /* send it */
866 ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres,
867 sz, send_to, &status);
868 if (ret < 0) {
869 /* XXX: negative status is not handled.
870 * this will end up killing this node. */
871 mlog_errno(ret);
872 } else {
873 /* might get an -ENOMEM back here */
874 ret = status;
875 if (ret < 0) {
876 mlog_errno(ret);
877
878 if (ret == -EFAULT) {
879 mlog(ML_ERROR, "node %u told me to kill "
880 "myself!\n", send_to);
881 BUG();
882 }
883 }
884 }
885
886 /* zero and reinit the message buffer */
887 dlm_init_migratable_lockres(mres, res->lockname.name,
888 res->lockname.len, mres_total_locks,
889 mig_cookie, orig_flags, orig_master);
890 return ret;
891}
892
893static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
894 const char *lockname, int namelen,
895 int total_locks, u64 cookie,
896 u8 flags, u8 master)
897{
898 /* mres here is one full page */
899 memset(mres, 0, PAGE_SIZE);
900 mres->lockname_len = namelen;
901 memcpy(mres->lockname, lockname, namelen);
902 mres->num_locks = 0;
903 mres->total_locks = cpu_to_be32(total_locks);
904 mres->mig_cookie = cpu_to_be64(cookie);
905 mres->flags = flags;
906 mres->master = master;
907}
908
909
910/* returns 1 if this lock fills the network structure,
911 * 0 otherwise */
912static int dlm_add_lock_to_array(struct dlm_lock *lock,
913 struct dlm_migratable_lockres *mres, int queue)
914{
915 struct dlm_migratable_lock *ml;
916 int lock_num = mres->num_locks;
917
918 ml = &(mres->ml[lock_num]);
919 ml->cookie = lock->ml.cookie;
920 ml->type = lock->ml.type;
921 ml->convert_type = lock->ml.convert_type;
922 ml->highest_blocked = lock->ml.highest_blocked;
923 ml->list = queue;
924 if (lock->lksb) {
925 ml->flags = lock->lksb->flags;
926 /* send our current lvb */
927 if (ml->type == LKM_EXMODE ||
928 ml->type == LKM_PRMODE) {
929 /* if it is already set, this had better be a PR
930 * and it has to match */
931 if (mres->lvb[0] && (ml->type == LKM_EXMODE ||
932 memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))) {
933 mlog(ML_ERROR, "mismatched lvbs!\n");
934 __dlm_print_one_lock_resource(lock->lockres);
935 BUG();
936 }
937 memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN);
938 }
939 }
940 ml->node = lock->ml.node;
941 mres->num_locks++;
942 /* we reached the max, send this network message */
943 if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS)
944 return 1;
945 return 0;
946}
947
948
949int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
950 struct dlm_migratable_lockres *mres,
951 u8 send_to, u8 flags)
952{
953 struct list_head *queue, *iter;
954 int total_locks, i;
955 u64 mig_cookie = 0;
956 struct dlm_lock *lock;
957 int ret = 0;
958
959 BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
960
961 mlog(0, "sending to %u\n", send_to);
962
963 total_locks = dlm_num_locks_in_lockres(res);
964 if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) {
965 /* rare, but possible */
966 mlog(0, "argh. lockres has %d locks. this will "
967 "require more than one network packet to "
968 "migrate\n", total_locks);
969 mig_cookie = dlm_get_next_mig_cookie();
970 }
971
972 dlm_init_migratable_lockres(mres, res->lockname.name,
973 res->lockname.len, total_locks,
974 mig_cookie, flags, res->owner);
975
976 total_locks = 0;
977 for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) {
978 queue = dlm_list_idx_to_ptr(res, i);
979 list_for_each(iter, queue) {
980 lock = list_entry (iter, struct dlm_lock, list);
981
982 /* add another lock. */
983 total_locks++;
984 if (!dlm_add_lock_to_array(lock, mres, i))
985 continue;
986
987 /* this filled the lock message,
988 * we must send it immediately. */
989 ret = dlm_send_mig_lockres_msg(dlm, mres, send_to,
990 res, total_locks);
991 if (ret < 0) {
992 // TODO
993 mlog(ML_ERROR, "dlm_send_mig_lockres_msg "
994 "returned %d, TODO\n", ret);
995 BUG();
996 }
997 }
998 }
999 /* flush any remaining locks */
1000 ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks);
1001 if (ret < 0) {
1002 // TODO
1003 mlog(ML_ERROR, "dlm_send_mig_lockres_msg returned %d, "
1004 "TODO\n", ret);
1005 BUG();
1006 }
1007 return ret;
1008}
1009
1010
1011
1012/*
1013 * this message will contain no more than one page worth of
1014 * recovery data, and it will work on only one lockres.
1015 * there may be many locks in this page, and we may need to wait
1016 * for additional packets to complete all the locks (rare, but
1017 * possible).
1018 */
1019/*
1020 * NOTE: the allocation error cases here are scary
1021 * we really cannot afford to fail an alloc in recovery
1022 * do we spin? returning an error only delays the problem really
1023 */
1024
1025int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data)
1026{
1027 struct dlm_ctxt *dlm = data;
1028 struct dlm_migratable_lockres *mres =
1029 (struct dlm_migratable_lockres *)msg->buf;
1030 int ret = 0;
1031 u8 real_master;
1032 char *buf = NULL;
1033 struct dlm_work_item *item = NULL;
1034 struct dlm_lock_resource *res = NULL;
1035
1036 if (!dlm_grab(dlm))
1037 return -EINVAL;
1038
1039 BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
1040
1041 real_master = mres->master;
1042 if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1043 /* cannot migrate a lockres with no master */
1044 BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
1045 }
1046
1047 mlog(0, "%s message received from node %u\n",
1048 (mres->flags & DLM_MRES_RECOVERY) ?
1049 "recovery" : "migration", mres->master);
1050 if (mres->flags & DLM_MRES_ALL_DONE)
1051 mlog(0, "all done flag. all lockres data received!\n");
1052
1053 ret = -ENOMEM;
1054 buf = kmalloc(be16_to_cpu(msg->data_len), GFP_KERNEL);
1055 item = kcalloc(1, sizeof(*item), GFP_KERNEL);
1056 if (!buf || !item)
1057 goto leave;
1058
1059 /* lookup the lock to see if we have a secondary queue for this
1060 * already... just add the locks in and this will have its owner
1061 * and RECOVERY flag changed when it completes. */
1062 res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len);
1063 if (res) {
1064 /* this will get a ref on res */
1065 /* mark it as recovering/migrating and hash it */
1066 spin_lock(&res->spinlock);
1067 if (mres->flags & DLM_MRES_RECOVERY) {
1068 res->state |= DLM_LOCK_RES_RECOVERING;
1069 } else {
1070 if (res->state & DLM_LOCK_RES_MIGRATING) {
1071 /* this is at least the second
1072 * lockres message */
1073 mlog(0, "lock %.*s is already migrating\n",
1074 mres->lockname_len,
1075 mres->lockname);
1076 } else if (res->state & DLM_LOCK_RES_RECOVERING) {
1077 /* caller should BUG */
1078 mlog(ML_ERROR, "node is attempting to migrate "
1079 "lock %.*s, but marked as recovering!\n",
1080 mres->lockname_len, mres->lockname);
1081 ret = -EFAULT;
1082 spin_unlock(&res->spinlock);
1083 goto leave;
1084 }
1085 res->state |= DLM_LOCK_RES_MIGRATING;
1086 }
1087 spin_unlock(&res->spinlock);
1088 } else {
1089 /* need to allocate, just like if it was
1090 * mastered here normally */
1091 res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len);
1092 if (!res)
1093 goto leave;
1094
1095 /* to match the ref that we would have gotten if
1096 * dlm_lookup_lockres had succeeded */
1097 dlm_lockres_get(res);
1098
1099 /* mark it as recovering/migrating and hash it */
1100 if (mres->flags & DLM_MRES_RECOVERY)
1101 res->state |= DLM_LOCK_RES_RECOVERING;
1102 else
1103 res->state |= DLM_LOCK_RES_MIGRATING;
1104
1105 spin_lock(&dlm->spinlock);
1106 __dlm_insert_lockres(dlm, res);
1107 spin_unlock(&dlm->spinlock);
1108
1109 /* now that the new lockres is inserted,
1110 * make it usable by other processes */
1111 spin_lock(&res->spinlock);
1112 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
1113 spin_unlock(&res->spinlock);
1114
1115 /* add an extra ref for just-allocated lockres
1116 * otherwise the lockres will be purged immediately */
1117 dlm_lockres_get(res);
1118
1119 }
1120
1121 /* at this point we have allocated everything we need,
1122 * and we have a hashed lockres with an extra ref and
1123 * the proper res->state flags. */
1124 ret = 0;
1125 if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1126 /* migration cannot have an unknown master */
1127 BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
1128 mlog(0, "recovery has passed me a lockres with an "
1129 "unknown owner.. will need to requery: "
1130 "%.*s\n", mres->lockname_len, mres->lockname);
1131 } else {
1132 spin_lock(&res->spinlock);
1133 dlm_change_lockres_owner(dlm, res, dlm->node_num);
1134 spin_unlock(&res->spinlock);
1135 }
1136
1137 /* queue up work for dlm_mig_lockres_worker */
1138 dlm_grab(dlm); /* get an extra ref for the work item */
1139 memcpy(buf, msg->buf, be16_to_cpu(msg->data_len)); /* copy the whole message */
1140 dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf);
1141 item->u.ml.lockres = res; /* already have a ref */
1142 item->u.ml.real_master = real_master;
1143 spin_lock(&dlm->work_lock);
1144 list_add_tail(&item->list, &dlm->work_list);
1145 spin_unlock(&dlm->work_lock);
1146 schedule_work(&dlm->dispatched_work);
1147
1148leave:
1149 dlm_put(dlm);
1150 if (ret < 0) {
1151 if (buf)
1152 kfree(buf);
1153 if (item)
1154 kfree(item);
1155 }
1156
1157 mlog_exit(ret);
1158 return ret;
1159}
1160
1161
1162static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data)
1163{
1164 struct dlm_ctxt *dlm = data;
1165 struct dlm_migratable_lockres *mres;
1166 int ret = 0;
1167 struct dlm_lock_resource *res;
1168 u8 real_master;
1169
1170 dlm = item->dlm;
1171 mres = (struct dlm_migratable_lockres *)data;
1172
1173 res = item->u.ml.lockres;
1174 real_master = item->u.ml.real_master;
1175
1176 if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1177 /* this case is super-rare. only occurs if
1178 * node death happens during migration. */
1179again:
1180 ret = dlm_lockres_master_requery(dlm, res, &real_master);
1181 if (ret < 0) {
1182 mlog(0, "dlm_lockres_master_requery failure: %d\n",
1183 ret);
1184 goto again;
1185 }
1186 if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1187 mlog(0, "lockres %.*s not claimed. "
1188 "this node will take it.\n",
1189 res->lockname.len, res->lockname.name);
1190 } else {
1191 mlog(0, "master needs to respond to sender "
1192 "that node %u still owns %.*s\n",
1193 real_master, res->lockname.len,
1194 res->lockname.name);
1195 /* cannot touch this lockres */
1196 goto leave;
1197 }
1198 }
1199
1200 ret = dlm_process_recovery_data(dlm, res, mres);
1201 if (ret < 0)
1202 mlog(0, "dlm_process_recovery_data returned %d\n", ret);
1203 else
1204 mlog(0, "dlm_process_recovery_data succeeded\n");
1205
1206 if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) ==
1207 (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) {
1208 ret = dlm_finish_migration(dlm, res, mres->master);
1209 if (ret < 0)
1210 mlog_errno(ret);
1211 }
1212
1213leave:
1214 kfree(data);
1215 mlog_exit(ret);
1216}
1217
1218
1219
1220static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
1221 struct dlm_lock_resource *res,
1222 u8 *real_master)
1223{
1224 struct dlm_node_iter iter;
1225 int nodenum;
1226 int ret = 0;
1227
1228 *real_master = DLM_LOCK_RES_OWNER_UNKNOWN;
1229
1230 /* we only reach here if one of the two nodes in a
1231 * migration died while the migration was in progress.
1232 * at this point we need to requery the master. we
1233 * know that the new_master got as far as creating
1234 * an mle on at least one node, but we do not know
1235 * if any nodes had actually cleared the mle and set
1236 * the master to the new_master. the old master
1237 * is supposed to set the owner to UNKNOWN in the
1238 * event of a new_master death, so the only possible
1239 * responses that we can get from nodes here are
1240 * that the master is new_master, or that the master
1241 * is UNKNOWN.
1242 * if all nodes come back with UNKNOWN then we know
1243 * the lock needs remastering here.
1244 * if any node comes back with a valid master, check
1245 * to see if that master is the one that we are
1246 * recovering. if so, then the new_master died and
1247 * we need to remaster this lock. if not, then the
1248 * new_master survived and that node will respond to
1249 * other nodes about the owner.
1250 * if there is an owner, this node needs to dump this
1251 * lockres and alert the sender that this lockres
1252 * was rejected. */
1253 spin_lock(&dlm->spinlock);
1254 dlm_node_iter_init(dlm->domain_map, &iter);
1255 spin_unlock(&dlm->spinlock);
1256
1257 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
1258 /* do not send to self */
1259 if (nodenum == dlm->node_num)
1260 continue;
1261 ret = dlm_do_master_requery(dlm, res, nodenum, real_master);
1262 if (ret < 0) {
1263 mlog_errno(ret);
1264 BUG();
1265 /* TODO: need to figure a way to restart this */
1266 }
1267 if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) {
1268 mlog(0, "lock master is %u\n", *real_master);
1269 break;
1270 }
1271 }
1272 return ret;
1273}
1274
1275
1276static int dlm_do_master_requery(struct dlm_ctxt *dlm,
1277 struct dlm_lock_resource *res,
1278 u8 nodenum, u8 *real_master)
1279{
1280 int ret = -EINVAL;
1281 struct dlm_master_requery req;
1282 int status = DLM_LOCK_RES_OWNER_UNKNOWN;
1283
1284 memset(&req, 0, sizeof(req));
1285 req.node_idx = dlm->node_num;
1286 req.namelen = res->lockname.len;
1287 memcpy(req.name, res->lockname.name, res->lockname.len);
1288
1289 ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key,
1290 &req, sizeof(req), nodenum, &status);
1291 /* XXX: negative status not handled properly here. */
1292 if (ret < 0)
1293 mlog_errno(ret);
1294 else {
1295 BUG_ON(status < 0);
1296 BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN);
1297 *real_master = (u8) (status & 0xff);
1298 mlog(0, "node %u responded to master requery with %u\n",
1299 nodenum, *real_master);
1300 ret = 0;
1301 }
1302 return ret;
1303}
1304
1305
1306/* this function cannot error, so unless the sending
1307 * or receiving of the message failed, the owner can
1308 * be trusted */
1309int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data)
1310{
1311 struct dlm_ctxt *dlm = data;
1312 struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf;
1313 struct dlm_lock_resource *res = NULL;
1314 int master = DLM_LOCK_RES_OWNER_UNKNOWN;
1315 u32 flags = DLM_ASSERT_MASTER_REQUERY;
1316
1317 if (!dlm_grab(dlm)) {
1318 /* since the domain has gone away on this
1319 * node, the proper response is UNKNOWN */
1320 return master;
1321 }
1322
1323 spin_lock(&dlm->spinlock);
1324 res = __dlm_lookup_lockres(dlm, req->name, req->namelen);
1325 if (res) {
1326 spin_lock(&res->spinlock);
1327 master = res->owner;
1328 if (master == dlm->node_num) {
1329 int ret = dlm_dispatch_assert_master(dlm, res,
1330 0, 0, flags);
1331 if (ret < 0) {
1332 mlog_errno(-ENOMEM);
1333 /* retry!? */
1334 BUG();
1335 }
1336 }
1337 spin_unlock(&res->spinlock);
1338 }
1339 spin_unlock(&dlm->spinlock);
1340
1341 dlm_put(dlm);
1342 return master;
1343}
1344
1345static inline struct list_head *
1346dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num)
1347{
1348 struct list_head *ret;
1349 BUG_ON(list_num < 0);
1350 BUG_ON(list_num > 2);
1351 ret = &(res->granted);
1352 ret += list_num;
1353 return ret;
1354}
1355/* TODO: do ast flush business
1356 * TODO: do MIGRATING and RECOVERING spinning
1357 */
1358
1359/*
1360* NOTE about in-flight requests during migration:
1361*
1362* Before attempting the migrate, the master has marked the lockres as
1363* MIGRATING and then flushed all of its pending ASTS. So any in-flight
1364* requests either got queued before the MIGRATING flag got set, in which
1365* case the lock data will reflect the change and a return message is on
1366* the way, or the request failed to get in before MIGRATING got set. In
1367* this case, the caller will be told to spin and wait for the MIGRATING
1368* flag to be dropped, then recheck the master.
1369* This holds true for the convert, cancel and unlock cases, and since lvb
1370* updates are tied to these same messages, it applies to lvb updates as
1371* well. For the lock case, there is no way a lock can be on the master
1372* queue and not be on the secondary queue since the lock is always added
1373* locally first. This means that the new target node will never be sent
1374* a lock that he doesn't already have on the list.
1375* In total, this means that the local lock is correct and should not be
1376* updated to match the one sent by the master. Any messages sent back
1377* from the master before the MIGRATING flag will bring the lock properly
1378* up-to-date, and the change will be ordered properly for the waiter.
1379* We will *not* attempt to modify the lock underneath the waiter.
1380*/
1381
1382static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
1383 struct dlm_lock_resource *res,
1384 struct dlm_migratable_lockres *mres)
1385{
1386 struct dlm_migratable_lock *ml;
1387 struct list_head *queue;
1388 struct dlm_lock *newlock = NULL;
1389 struct dlm_lockstatus *lksb = NULL;
1390 int ret = 0;
1391 int i;
1392 struct list_head *iter;
1393 struct dlm_lock *lock = NULL;
1394
1395 mlog(0, "running %d locks for this lockres\n", mres->num_locks);
1396 for (i=0; i<mres->num_locks; i++) {
1397 ml = &(mres->ml[i]);
1398 BUG_ON(ml->highest_blocked != LKM_IVMODE);
1399 newlock = NULL;
1400 lksb = NULL;
1401
1402 queue = dlm_list_num_to_pointer(res, ml->list);
1403
1404 /* if the lock is for the local node it needs to
1405 * be moved to the proper location within the queue.
1406 * do not allocate a new lock structure. */
1407 if (ml->node == dlm->node_num) {
1408 /* MIGRATION ONLY! */
1409 BUG_ON(!(mres->flags & DLM_MRES_MIGRATION));
1410
1411 spin_lock(&res->spinlock);
1412 list_for_each(iter, queue) {
1413 lock = list_entry (iter, struct dlm_lock, list);
1414 if (lock->ml.cookie != ml->cookie)
1415 lock = NULL;
1416 else
1417 break;
1418 }
1419
1420 /* lock is always created locally first, and
1421 * destroyed locally last. it must be on the list */
1422 if (!lock) {
1423 mlog(ML_ERROR, "could not find local lock "
1424 "with cookie %"MLFu64"!\n",
1425 ml->cookie);
1426 BUG();
1427 }
1428 BUG_ON(lock->ml.node != ml->node);
1429
1430 /* see NOTE above about why we do not update
1431 * to match the master here */
1432
1433 /* move the lock to its proper place */
1434 /* do not alter lock refcount. switching lists. */
1435 list_del_init(&lock->list);
1436 list_add_tail(&lock->list, queue);
1437 spin_unlock(&res->spinlock);
1438
1439 mlog(0, "just reordered a local lock!\n");
1440 continue;
1441 }
1442
1443 /* lock is for another node. */
1444 newlock = dlm_new_lock(ml->type, ml->node,
1445 be64_to_cpu(ml->cookie), NULL);
1446 if (!newlock) {
1447 ret = -ENOMEM;
1448 goto leave;
1449 }
1450 lksb = newlock->lksb;
1451 dlm_lock_attach_lockres(newlock, res);
1452
1453 if (ml->convert_type != LKM_IVMODE) {
1454 BUG_ON(queue != &res->converting);
1455 newlock->ml.convert_type = ml->convert_type;
1456 }
1457 lksb->flags |= (ml->flags &
1458 (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
1459
1460 if (mres->lvb[0]) {
1461 if (lksb->flags & DLM_LKSB_PUT_LVB) {
1462 /* other node was trying to update
1463 * lvb when node died. recreate the
1464 * lksb with the updated lvb. */
1465 memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN);
1466 } else {
1467 /* otherwise, the node is sending its
1468 * most recent valid lvb info */
1469 BUG_ON(ml->type != LKM_EXMODE &&
1470 ml->type != LKM_PRMODE);
1471 if (res->lvb[0] && (ml->type == LKM_EXMODE ||
1472 memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) {
1473 mlog(ML_ERROR, "received bad lvb!\n");
1474 __dlm_print_one_lock_resource(res);
1475 BUG();
1476 }
1477 memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
1478 }
1479 }
1480
1481
1482 /* NOTE:
1483 * wrt lock queue ordering and recovery:
1484 * 1. order of locks on granted queue is
1485 * meaningless.
1486 * 2. order of locks on converting queue is
1487 * LOST with the node death. sorry charlie.
1488 * 3. order of locks on the blocked queue is
1489 * also LOST.
1490 * order of locks does not affect integrity, it
1491 * just means that a lock request may get pushed
1492 * back in line as a result of the node death.
1493 * also note that for a given node the lock order
1494 * for its secondary queue locks is preserved
1495 * relative to each other, but clearly *not*
1496 * preserved relative to locks from other nodes.
1497 */
1498 spin_lock(&res->spinlock);
1499 dlm_lock_get(newlock);
1500 list_add_tail(&newlock->list, queue);
1501 spin_unlock(&res->spinlock);
1502 }
1503 mlog(0, "done running all the locks\n");
1504
1505leave:
1506 if (ret < 0) {
1507 mlog_errno(ret);
1508 if (newlock)
1509 dlm_lock_put(newlock);
1510 }
1511
1512 mlog_exit(ret);
1513 return ret;
1514}
1515
1516void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
1517 struct dlm_lock_resource *res)
1518{
1519 int i;
1520 struct list_head *queue, *iter, *iter2;
1521 struct dlm_lock *lock;
1522
1523 res->state |= DLM_LOCK_RES_RECOVERING;
1524 if (!list_empty(&res->recovering))
1525 list_del_init(&res->recovering);
1526 list_add_tail(&res->recovering, &dlm->reco.resources);
1527
1528 /* find any pending locks and put them back on proper list */
1529 for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) {
1530 queue = dlm_list_idx_to_ptr(res, i);
1531 list_for_each_safe(iter, iter2, queue) {
1532 lock = list_entry (iter, struct dlm_lock, list);
1533 dlm_lock_get(lock);
1534 if (lock->convert_pending) {
1535 /* move converting lock back to granted */
1536 BUG_ON(i != DLM_CONVERTING_LIST);
1537 mlog(0, "node died with convert pending "
1538 "on %.*s. move back to granted list.\n",
1539 res->lockname.len, res->lockname.name);
1540 dlm_revert_pending_convert(res, lock);
1541 lock->convert_pending = 0;
1542 } else if (lock->lock_pending) {
1543 /* remove pending lock requests completely */
1544 BUG_ON(i != DLM_BLOCKED_LIST);
1545 mlog(0, "node died with lock pending "
1546 "on %.*s. remove from blocked list and skip.\n",
1547 res->lockname.len, res->lockname.name);
1548 /* lock will be floating until ref in
1549 * dlmlock_remote is freed after the network
1550 * call returns. ok for it to not be on any
1551 * list since no ast can be called
1552 * (the master is dead). */
1553 dlm_revert_pending_lock(res, lock);
1554 lock->lock_pending = 0;
1555 } else if (lock->unlock_pending) {
1556 /* if an unlock was in progress, treat as
1557 * if this had completed successfully
1558 * before sending this lock state to the
1559 * new master. note that the dlm_unlock
1560 * call is still responsible for calling
1561 * the unlockast. that will happen after
1562 * the network call times out. for now,
1563 * just move lists to prepare the new
1564 * recovery master. */
1565 BUG_ON(i != DLM_GRANTED_LIST);
1566 mlog(0, "node died with unlock pending "
1567 "on %.*s. remove from blocked list and skip.\n",
1568 res->lockname.len, res->lockname.name);
1569 dlm_commit_pending_unlock(res, lock);
1570 lock->unlock_pending = 0;
1571 } else if (lock->cancel_pending) {
1572 /* if a cancel was in progress, treat as
1573 * if this had completed successfully
1574 * before sending this lock state to the
1575 * new master */
1576 BUG_ON(i != DLM_CONVERTING_LIST);
1577 mlog(0, "node died with cancel pending "
1578 "on %.*s. move back to granted list.\n",
1579 res->lockname.len, res->lockname.name);
1580 dlm_commit_pending_cancel(res, lock);
1581 lock->cancel_pending = 0;
1582 }
1583 dlm_lock_put(lock);
1584 }
1585 }
1586}
1587
1588
1589
1590/* removes all recovered locks from the recovery list.
1591 * sets the res->owner to the new master.
1592 * unsets the RECOVERY flag and wakes waiters. */
1593static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
1594 u8 dead_node, u8 new_master)
1595{
1596 int i;
1597 struct list_head *iter, *iter2, *bucket;
1598 struct dlm_lock_resource *res;
1599
1600 mlog_entry_void();
1601
1602 assert_spin_locked(&dlm->spinlock);
1603
1604 list_for_each_safe(iter, iter2, &dlm->reco.resources) {
1605 res = list_entry (iter, struct dlm_lock_resource, recovering);
1606 if (res->owner == dead_node) {
1607 list_del_init(&res->recovering);
1608 spin_lock(&res->spinlock);
1609 dlm_change_lockres_owner(dlm, res, new_master);
1610 res->state &= ~DLM_LOCK_RES_RECOVERING;
1611 __dlm_dirty_lockres(dlm, res);
1612 spin_unlock(&res->spinlock);
1613 wake_up(&res->wq);
1614 }
1615 }
1616
1617 /* this will become unnecessary eventually, but
1618 * for now we need to run the whole hash, clear
1619 * the RECOVERING state and set the owner
1620 * if necessary */
1621 for (i=0; i<DLM_HASH_SIZE; i++) {
1622 bucket = &(dlm->resources[i]);
1623 list_for_each(iter, bucket) {
1624 res = list_entry (iter, struct dlm_lock_resource, list);
1625 if (res->state & DLM_LOCK_RES_RECOVERING) {
1626 if (res->owner == dead_node) {
1627 mlog(0, "(this=%u) res %.*s owner=%u "
1628 "was not on recovering list, but "
1629 "clearing state anyway\n",
1630 dlm->node_num, res->lockname.len,
1631 res->lockname.name, new_master);
1632 } else if (res->owner == dlm->node_num) {
1633 mlog(0, "(this=%u) res %.*s owner=%u "
1634 "was not on recovering list, "
1635 "owner is THIS node, clearing\n",
1636 dlm->node_num, res->lockname.len,
1637 res->lockname.name, new_master);
1638 } else
1639 continue;
1640
1641 spin_lock(&res->spinlock);
1642 dlm_change_lockres_owner(dlm, res, new_master);
1643 res->state &= ~DLM_LOCK_RES_RECOVERING;
1644 __dlm_dirty_lockres(dlm, res);
1645 spin_unlock(&res->spinlock);
1646 wake_up(&res->wq);
1647 }
1648 }
1649 }
1650}
1651
1652static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local)
1653{
1654 if (local) {
1655 if (lock->ml.type != LKM_EXMODE &&
1656 lock->ml.type != LKM_PRMODE)
1657 return 1;
1658 } else if (lock->ml.type == LKM_EXMODE)
1659 return 1;
1660 return 0;
1661}
1662
1663static void dlm_revalidate_lvb(struct dlm_ctxt *dlm,
1664 struct dlm_lock_resource *res, u8 dead_node)
1665{
1666 struct list_head *iter, *queue;
1667 struct dlm_lock *lock;
1668 int blank_lvb = 0, local = 0;
1669 int i;
1670 u8 search_node;
1671
1672 assert_spin_locked(&dlm->spinlock);
1673 assert_spin_locked(&res->spinlock);
1674
1675 if (res->owner == dlm->node_num)
1676 /* if this node owned the lockres, and if the dead node
1677 * had an EX when he died, blank out the lvb */
1678 search_node = dead_node;
1679 else {
1680 /* if this is a secondary lockres, and we had no EX or PR
1681 * locks granted, we can no longer trust the lvb */
1682 search_node = dlm->node_num;
1683 local = 1; /* check local state for valid lvb */
1684 }
1685
1686 for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) {
1687 queue = dlm_list_idx_to_ptr(res, i);
1688 list_for_each(iter, queue) {
1689 lock = list_entry (iter, struct dlm_lock, list);
1690 if (lock->ml.node == search_node) {
1691 if (dlm_lvb_needs_invalidation(lock, local)) {
1692 /* zero the lksb lvb and lockres lvb */
1693 blank_lvb = 1;
1694 memset(lock->lksb->lvb, 0, DLM_LVB_LEN);
1695 }
1696 }
1697 }
1698 }
1699
1700 if (blank_lvb) {
1701 mlog(0, "clearing %.*s lvb, dead node %u had EX\n",
1702 res->lockname.len, res->lockname.name, dead_node);
1703 memset(res->lvb, 0, DLM_LVB_LEN);
1704 }
1705}
1706
1707static void dlm_free_dead_locks(struct dlm_ctxt *dlm,
1708 struct dlm_lock_resource *res, u8 dead_node)
1709{
1710 struct list_head *iter, *tmpiter;
1711 struct dlm_lock *lock;
1712
1713 /* this node is the lockres master:
1714 * 1) remove any stale locks for the dead node
1715 * 2) if the dead node had an EX when he died, blank out the lvb
1716 */
1717 assert_spin_locked(&dlm->spinlock);
1718 assert_spin_locked(&res->spinlock);
1719
1720 /* TODO: check pending_asts, pending_basts here */
1721 list_for_each_safe(iter, tmpiter, &res->granted) {
1722 lock = list_entry (iter, struct dlm_lock, list);
1723 if (lock->ml.node == dead_node) {
1724 list_del_init(&lock->list);
1725 dlm_lock_put(lock);
1726 }
1727 }
1728 list_for_each_safe(iter, tmpiter, &res->converting) {
1729 lock = list_entry (iter, struct dlm_lock, list);
1730 if (lock->ml.node == dead_node) {
1731 list_del_init(&lock->list);
1732 dlm_lock_put(lock);
1733 }
1734 }
1735 list_for_each_safe(iter, tmpiter, &res->blocked) {
1736 lock = list_entry (iter, struct dlm_lock, list);
1737 if (lock->ml.node == dead_node) {
1738 list_del_init(&lock->list);
1739 dlm_lock_put(lock);
1740 }
1741 }
1742
1743 /* do not kick thread yet */
1744 __dlm_dirty_lockres(dlm, res);
1745}
1746
1747/* if this node is the recovery master, and there are no
1748 * locks for a given lockres owned by this node that are in
1749 * either PR or EX mode, zero out the lvb before requesting.
1750 *
1751 */
1752
1753
1754static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
1755{
1756 struct list_head *iter;
1757 struct dlm_lock_resource *res;
1758 int i;
1759 struct list_head *bucket;
1760
1761
1762 /* purge any stale mles */
1763 dlm_clean_master_list(dlm, dead_node);
1764
1765 /*
1766 * now clean up all lock resources. there are two rules:
1767 *
1768 * 1) if the dead node was the master, move the lockres
1769 * to the recovering list. set the RECOVERING flag.
1770 * this lockres needs to be cleaned up before it can
1771 * be used further.
1772 *
1773 * 2) if this node was the master, remove all locks from
1774 * each of the lockres queues that were owned by the
1775 * dead node. once recovery finishes, the dlm thread
1776 * can be kicked again to see if any ASTs or BASTs
1777 * need to be fired as a result.
1778 */
1779 for (i=0; i<DLM_HASH_SIZE; i++) {
1780 bucket = &(dlm->resources[i]);
1781 list_for_each(iter, bucket) {
1782 res = list_entry (iter, struct dlm_lock_resource, list);
1783 if (dlm_is_recovery_lock(res->lockname.name,
1784 res->lockname.len))
1785 continue;
1786
1787 spin_lock(&res->spinlock);
1788 /* zero the lvb if necessary */
1789 dlm_revalidate_lvb(dlm, res, dead_node);
1790 if (res->owner == dead_node)
1791 dlm_move_lockres_to_recovery_list(dlm, res);
1792 else if (res->owner == dlm->node_num) {
1793 dlm_free_dead_locks(dlm, res, dead_node);
1794 __dlm_lockres_calc_usage(dlm, res);
1795 }
1796 spin_unlock(&res->spinlock);
1797 }
1798 }
1799
1800}
1801
1802static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx)
1803{
1804 assert_spin_locked(&dlm->spinlock);
1805
1806 /* check to see if the node is already considered dead */
1807 if (!test_bit(idx, dlm->live_nodes_map)) {
1808 mlog(0, "for domain %s, node %d is already dead. "
1809 "another node likely did recovery already.\n",
1810 dlm->name, idx);
1811 return;
1812 }
1813
1814 /* check to see if we do not care about this node */
1815 if (!test_bit(idx, dlm->domain_map)) {
1816 /* This also catches the case that we get a node down
1817 * but haven't joined the domain yet. */
1818 mlog(0, "node %u already removed from domain!\n", idx);
1819 return;
1820 }
1821
1822 clear_bit(idx, dlm->live_nodes_map);
1823
1824 /* Clean up join state on node death. */
1825 if (dlm->joining_node == idx) {
1826 mlog(0, "Clearing join state for node %u\n", idx);
1827 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
1828 }
1829
1830 /* make sure local cleanup occurs before the heartbeat events */
1831 if (!test_bit(idx, dlm->recovery_map))
1832 dlm_do_local_recovery_cleanup(dlm, idx);
1833
1834 /* notify anything attached to the heartbeat events */
1835 dlm_hb_event_notify_attached(dlm, idx, 0);
1836
1837 mlog(0, "node %u being removed from domain map!\n", idx);
1838 clear_bit(idx, dlm->domain_map);
1839 /* wake up migration waiters if a node goes down.
1840 * perhaps later we can genericize this for other waiters. */
1841 wake_up(&dlm->migration_wq);
1842
1843 if (test_bit(idx, dlm->recovery_map))
1844 mlog(0, "domain %s, node %u already added "
1845 "to recovery map!\n", dlm->name, idx);
1846 else
1847 set_bit(idx, dlm->recovery_map);
1848}
1849
1850void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data)
1851{
1852 struct dlm_ctxt *dlm = data;
1853
1854 if (!dlm_grab(dlm))
1855 return;
1856
1857 spin_lock(&dlm->spinlock);
1858 __dlm_hb_node_down(dlm, idx);
1859 spin_unlock(&dlm->spinlock);
1860
1861 dlm_put(dlm);
1862}
1863
1864void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data)
1865{
1866 struct dlm_ctxt *dlm = data;
1867
1868 if (!dlm_grab(dlm))
1869 return;
1870
1871 spin_lock(&dlm->spinlock);
1872
1873 set_bit(idx, dlm->live_nodes_map);
1874
1875 /* notify any mles attached to the heartbeat events */
1876 dlm_hb_event_notify_attached(dlm, idx, 1);
1877
1878 spin_unlock(&dlm->spinlock);
1879
1880 dlm_put(dlm);
1881}
1882
1883static void dlm_reco_ast(void *astdata)
1884{
1885 struct dlm_ctxt *dlm = astdata;
1886 mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n",
1887 dlm->node_num, dlm->name);
1888}
1889static void dlm_reco_bast(void *astdata, int blocked_type)
1890{
1891 struct dlm_ctxt *dlm = astdata;
1892 mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n",
1893 dlm->node_num, dlm->name);
1894}
1895static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st)
1896{
1897 mlog(0, "unlockast for recovery lock fired!\n");
1898}
1899
1900
1901static int dlm_pick_recovery_master(struct dlm_ctxt *dlm)
1902{
1903 enum dlm_status ret;
1904 struct dlm_lockstatus lksb;
1905 int status = -EINVAL;
1906
1907 mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n",
1908 dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num);
1909retry:
1910 memset(&lksb, 0, sizeof(lksb));
1911
1912 ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY,
1913 DLM_RECOVERY_LOCK_NAME, dlm_reco_ast, dlm, dlm_reco_bast);
1914
1915 if (ret == DLM_NORMAL) {
1916 mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n",
1917 dlm->name, dlm->node_num);
1918 /* I am master, send message to all nodes saying
1919 * that I am beginning a recovery session */
1920 status = dlm_send_begin_reco_message(dlm,
1921 dlm->reco.dead_node);
1922
1923 /* recovery lock is a special case. ast will not get fired,
1924 * so just go ahead and unlock it. */
1925 ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm);
1926 if (ret != DLM_NORMAL) {
1927 /* this would really suck. this could only happen
1928 * if there was a network error during the unlock
1929 * because of node death. this means the unlock
1930 * is actually "done" and the lock structure is
1931 * even freed. we can continue, but only
1932 * because this specific lock name is special. */
1933 mlog(0, "dlmunlock returned %d\n", ret);
1934 }
1935
1936 if (status < 0) {
1937 mlog(0, "failed to send recovery message. "
1938 "must retry with new node map.\n");
1939 goto retry;
1940 }
1941 } else if (ret == DLM_NOTQUEUED) {
1942 mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n",
1943 dlm->name, dlm->node_num);
1944 /* another node is master. wait on
1945 * reco.new_master != O2NM_INVALID_NODE_NUM */
1946 status = -EEXIST;
1947 }
1948
1949 return status;
1950}
1951
1952static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node)
1953{
1954 struct dlm_begin_reco br;
1955 int ret = 0;
1956 struct dlm_node_iter iter;
1957 int nodenum;
1958 int status;
1959
1960 mlog_entry("%u\n", dead_node);
1961
1962 mlog(0, "dead node is %u\n", dead_node);
1963
1964 spin_lock(&dlm->spinlock);
1965 dlm_node_iter_init(dlm->domain_map, &iter);
1966 spin_unlock(&dlm->spinlock);
1967
1968 clear_bit(dead_node, iter.node_map);
1969
1970 memset(&br, 0, sizeof(br));
1971 br.node_idx = dlm->node_num;
1972 br.dead_node = dead_node;
1973
1974 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
1975 ret = 0;
1976 if (nodenum == dead_node) {
1977 mlog(0, "not sending begin reco to dead node "
1978 "%u\n", dead_node);
1979 continue;
1980 }
1981 if (nodenum == dlm->node_num) {
1982 mlog(0, "not sending begin reco to self\n");
1983 continue;
1984 }
1985
1986 ret = -EINVAL;
1987 mlog(0, "attempting to send begin reco msg to %d\n",
1988 nodenum);
1989 ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key,
1990 &br, sizeof(br), nodenum, &status);
1991 /* negative status is handled ok by caller here */
1992 if (ret >= 0)
1993 ret = status;
1994 if (ret < 0) {
1995 struct dlm_lock_resource *res;
1996 mlog_errno(ret);
1997 mlog(ML_ERROR, "begin reco of dlm %s to node %u "
1998 " returned %d\n", dlm->name, nodenum, ret);
1999 res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
2000 DLM_RECOVERY_LOCK_NAME_LEN);
2001 if (res) {
2002 dlm_print_one_lock_resource(res);
2003 dlm_lockres_put(res);
2004 } else {
2005 mlog(ML_ERROR, "recovery lock not found\n");
2006 }
2007 break;
2008 }
2009 }
2010
2011 return ret;
2012}
2013
2014int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data)
2015{
2016 struct dlm_ctxt *dlm = data;
2017 struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf;
2018
2019 /* ok to return 0, domain has gone away */
2020 if (!dlm_grab(dlm))
2021 return 0;
2022
2023 mlog(0, "node %u wants to recover node %u\n",
2024 br->node_idx, br->dead_node);
2025
2026 dlm_fire_domain_eviction_callbacks(dlm, br->dead_node);
2027
2028 spin_lock(&dlm->spinlock);
2029 if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
2030 mlog(0, "new_master already set to %u!\n",
2031 dlm->reco.new_master);
2032 }
2033 if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) {
2034 mlog(0, "dead_node already set to %u!\n",
2035 dlm->reco.dead_node);
2036 }
2037 dlm->reco.new_master = br->node_idx;
2038 dlm->reco.dead_node = br->dead_node;
2039 if (!test_bit(br->dead_node, dlm->recovery_map)) {
2040 mlog(ML_ERROR, "recovery master %u sees %u as dead, but this "
2041 "node has not yet. marking %u as dead\n",
2042 br->node_idx, br->dead_node, br->dead_node);
2043 __dlm_hb_node_down(dlm, br->dead_node);
2044 }
2045 spin_unlock(&dlm->spinlock);
2046
2047 dlm_kick_recovery_thread(dlm);
2048 dlm_put(dlm);
2049 return 0;
2050}
2051
2052static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
2053{
2054 int ret = 0;
2055 struct dlm_finalize_reco fr;
2056 struct dlm_node_iter iter;
2057 int nodenum;
2058 int status;
2059
2060 mlog(0, "finishing recovery for node %s:%u\n",
2061 dlm->name, dlm->reco.dead_node);
2062
2063 spin_lock(&dlm->spinlock);
2064 dlm_node_iter_init(dlm->domain_map, &iter);
2065 spin_unlock(&dlm->spinlock);
2066
2067 memset(&fr, 0, sizeof(fr));
2068 fr.node_idx = dlm->node_num;
2069 fr.dead_node = dlm->reco.dead_node;
2070
2071 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
2072 if (nodenum == dlm->node_num)
2073 continue;
2074 ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key,
2075 &fr, sizeof(fr), nodenum, &status);
2076 if (ret >= 0) {
2077 ret = status;
2078 if (dlm_is_host_down(ret)) {
2079 /* this has no effect on this recovery
2080 * session, so set the status to zero to
2081 * finish out the last recovery */
2082 mlog(ML_ERROR, "node %u went down after this "
2083 "node finished recovery.\n", nodenum);
2084 ret = 0;
2085 }
2086 }
2087 if (ret < 0) {
2088 mlog_errno(ret);
2089 break;
2090 }
2091 }
2092
2093 return ret;
2094}
2095
2096int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data)
2097{
2098 struct dlm_ctxt *dlm = data;
2099 struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf;
2100
2101 /* ok to return 0, domain has gone away */
2102 if (!dlm_grab(dlm))
2103 return 0;
2104
2105 mlog(0, "node %u finalizing recovery of node %u\n",
2106 fr->node_idx, fr->dead_node);
2107
2108 spin_lock(&dlm->spinlock);
2109
2110 if (dlm->reco.new_master != fr->node_idx) {
2111 mlog(ML_ERROR, "node %u sent recovery finalize msg, but node "
2112 "%u is supposed to be the new master, dead=%u\n",
2113 fr->node_idx, dlm->reco.new_master, fr->dead_node);
2114 BUG();
2115 }
2116 if (dlm->reco.dead_node != fr->dead_node) {
2117 mlog(ML_ERROR, "node %u sent recovery finalize msg for dead "
2118 "node %u, but node %u is supposed to be dead\n",
2119 fr->node_idx, fr->dead_node, dlm->reco.dead_node);
2120 BUG();
2121 }
2122
2123 dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx);
2124
2125 spin_unlock(&dlm->spinlock);
2126
2127 dlm_reset_recovery(dlm);
2128
2129 dlm_kick_recovery_thread(dlm);
2130 dlm_put(dlm);
2131 return 0;
2132}
generated by cgit v1.2.2 (git 2.25.0) at 2024-12-19 20:06:11 -0500