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block: ll_rw_blk.c: cosmetics
[linux-2.6/kmemtrace.git] / fs / ocfs2 / dlm / dlmrecovery.c
bloba2c33160bfd6838dd17487b49492f6a85e5b3539
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 #include <linux/delay.h>
43
44
45 #include "cluster/heartbeat.h"
46 #include "cluster/nodemanager.h"
47 #include "cluster/tcp.h"
48
49 #include "dlmapi.h"
50 #include "dlmcommon.h"
51 #include "dlmdomain.h"
52
53 #define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_RECOVERY)
54 #include "cluster/masklog.h"
55
56 static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node);
57
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);
63
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);
70
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,
75 u8 flags, u8 master);
76 static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
77 struct dlm_migratable_lockres *mres,
78 u8 send_to,
79 struct dlm_lock_resource *res,
80 int total_locks);
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,
96 void *data);
97 static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data);
98 static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
99 struct dlm_lock_resource *res,
100 u8 *real_master);
101
102 static u64 dlm_get_next_mig_cookie(void);
103
104 static DEFINE_SPINLOCK(dlm_reco_state_lock);
105 static DEFINE_SPINLOCK(dlm_mig_cookie_lock);
106 static u64 dlm_mig_cookie = 1;
107
108 static u64 dlm_get_next_mig_cookie(void)
109 {
110 u64 c;
111 spin_lock(&dlm_mig_cookie_lock);
112 c = dlm_mig_cookie;
113 if (dlm_mig_cookie == (~0ULL))
114 dlm_mig_cookie = 1;
115 else
116 dlm_mig_cookie++;
117 spin_unlock(&dlm_mig_cookie_lock);
118 return c;
119 }
120
121 static inline void dlm_set_reco_dead_node(struct dlm_ctxt *dlm,
122 u8 dead_node)
123 {
124 assert_spin_locked(&dlm->spinlock);
125 if (dlm->reco.dead_node != dead_node)
126 mlog(0, "%s: changing dead_node from %u to %u\n",
127 dlm->name, dlm->reco.dead_node, dead_node);
128 dlm->reco.dead_node = dead_node;
129 }
130
131 static inline void dlm_set_reco_master(struct dlm_ctxt *dlm,
132 u8 master)
133 {
134 assert_spin_locked(&dlm->spinlock);
135 mlog(0, "%s: changing new_master from %u to %u\n",
136 dlm->name, dlm->reco.new_master, master);
137 dlm->reco.new_master = master;
138 }
139
140 static inline void __dlm_reset_recovery(struct dlm_ctxt *dlm)
141 {
142 assert_spin_locked(&dlm->spinlock);
143 clear_bit(dlm->reco.dead_node, dlm->recovery_map);
144 dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
145 dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
146 }
147
148 static inline void dlm_reset_recovery(struct dlm_ctxt *dlm)
149 {
150 spin_lock(&dlm->spinlock);
151 __dlm_reset_recovery(dlm);
152 spin_unlock(&dlm->spinlock);
153 }
154
155 /* Worker function used during recovery. */
156 void dlm_dispatch_work(struct work_struct *work)
157 {
158 struct dlm_ctxt *dlm =
159 container_of(work, struct dlm_ctxt, dispatched_work);
160 LIST_HEAD(tmp_list);
161 struct dlm_work_item *item, *next;
162 dlm_workfunc_t *workfunc;
163 int tot=0;
164
165 spin_lock(&dlm->work_lock);
166 list_splice_init(&dlm->work_list, &tmp_list);
167 spin_unlock(&dlm->work_lock);
168
169 list_for_each_entry(item, &tmp_list, list) {
170 tot++;
171 }
172 mlog(0, "%s: work thread has %d work items\n", dlm->name, tot);
173
174 list_for_each_entry_safe(item, next, &tmp_list, list) {
175 workfunc = item->func;
176 list_del_init(&item->list);
177
178 /* already have ref on dlm to avoid having
179 * it disappear. just double-check. */
180 BUG_ON(item->dlm != dlm);
181
182 /* this is allowed to sleep and
183 * call network stuff */
184 workfunc(item, item->data);
185
186 dlm_put(dlm);
187 kfree(item);
188 }
189 }
190
191 /*
192 * RECOVERY THREAD
193 */
194
195 void dlm_kick_recovery_thread(struct dlm_ctxt *dlm)
196 {
197 /* wake the recovery thread
198 * this will wake the reco thread in one of three places
199 * 1) sleeping with no recovery happening
200 * 2) sleeping with recovery mastered elsewhere
201 * 3) recovery mastered here, waiting on reco data */
202
203 wake_up(&dlm->dlm_reco_thread_wq);
204 }
205
206 /* Launch the recovery thread */
207 int dlm_launch_recovery_thread(struct dlm_ctxt *dlm)
208 {
209 mlog(0, "starting dlm recovery thread...\n");
210
211 dlm->dlm_reco_thread_task = kthread_run(dlm_recovery_thread, dlm,
212 "dlm_reco_thread");
213 if (IS_ERR(dlm->dlm_reco_thread_task)) {
214 mlog_errno(PTR_ERR(dlm->dlm_reco_thread_task));
215 dlm->dlm_reco_thread_task = NULL;
216 return -EINVAL;
217 }
218
219 return 0;
220 }
221
222 void dlm_complete_recovery_thread(struct dlm_ctxt *dlm)
223 {
224 if (dlm->dlm_reco_thread_task) {
225 mlog(0, "waiting for dlm recovery thread to exit\n");
226 kthread_stop(dlm->dlm_reco_thread_task);
227 dlm->dlm_reco_thread_task = NULL;
228 }
229 }
230
231
232
233 /*
234 * this is lame, but here's how recovery works...
235 * 1) all recovery threads cluster wide will work on recovering
236 * ONE node at a time
237 * 2) negotiate who will take over all the locks for the dead node.
238 * thats right... ALL the locks.
239 * 3) once a new master is chosen, everyone scans all locks
240 * and moves aside those mastered by the dead guy
241 * 4) each of these locks should be locked until recovery is done
242 * 5) the new master collects up all of secondary lock queue info
243 * one lock at a time, forcing each node to communicate back
244 * before continuing
245 * 6) each secondary lock queue responds with the full known lock info
246 * 7) once the new master has run all its locks, it sends a ALLDONE!
247 * message to everyone
248 * 8) upon receiving this message, the secondary queue node unlocks
249 * and responds to the ALLDONE
250 * 9) once the new master gets responses from everyone, he unlocks
251 * everything and recovery for this dead node is done
252 *10) go back to 2) while there are still dead nodes
253 *
254 */
255
256 static void dlm_print_reco_node_status(struct dlm_ctxt *dlm)
257 {
258 struct dlm_reco_node_data *ndata;
259 struct dlm_lock_resource *res;
260
261 mlog(ML_NOTICE, "%s(%d): recovery info, state=%s, dead=%u, master=%u\n",
262 dlm->name, dlm->dlm_reco_thread_task->pid,
263 dlm->reco.state & DLM_RECO_STATE_ACTIVE ? "ACTIVE" : "inactive",
264 dlm->reco.dead_node, dlm->reco.new_master);
265
266 list_for_each_entry(ndata, &dlm->reco.node_data, list) {
267 char *st = "unknown";
268 switch (ndata->state) {
269 case DLM_RECO_NODE_DATA_INIT:
270 st = "init";
271 break;
272 case DLM_RECO_NODE_DATA_REQUESTING:
273 st = "requesting";
274 break;
275 case DLM_RECO_NODE_DATA_DEAD:
276 st = "dead";
277 break;
278 case DLM_RECO_NODE_DATA_RECEIVING:
279 st = "receiving";
280 break;
281 case DLM_RECO_NODE_DATA_REQUESTED:
282 st = "requested";
283 break;
284 case DLM_RECO_NODE_DATA_DONE:
285 st = "done";
286 break;
287 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
288 st = "finalize-sent";
289 break;
290 default:
291 st = "bad";
292 break;
293 }
294 mlog(ML_NOTICE, "%s: reco state, node %u, state=%s\n",
295 dlm->name, ndata->node_num, st);
296 }
297 list_for_each_entry(res, &dlm->reco.resources, recovering) {
298 mlog(ML_NOTICE, "%s: lockres %.*s on recovering list\n",
299 dlm->name, res->lockname.len, res->lockname.name);
300 }
301 }
302
303 #define DLM_RECO_THREAD_TIMEOUT_MS (5 * 1000)
304
305 static int dlm_recovery_thread(void *data)
306 {
307 int status;
308 struct dlm_ctxt *dlm = data;
309 unsigned long timeout = msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS);
310
311 mlog(0, "dlm thread running for %s...\n", dlm->name);
312
313 while (!kthread_should_stop()) {
314 if (dlm_joined(dlm)) {
315 status = dlm_do_recovery(dlm);
316 if (status == -EAGAIN) {
317 /* do not sleep, recheck immediately. */
318 continue;
319 }
320 if (status < 0)
321 mlog_errno(status);
322 }
323
324 wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
325 kthread_should_stop(),
326 timeout);
327 }
328
329 mlog(0, "quitting DLM recovery thread\n");
330 return 0;
331 }
332
333 /* returns true when the recovery master has contacted us */
334 static int dlm_reco_master_ready(struct dlm_ctxt *dlm)
335 {
336 int ready;
337 spin_lock(&dlm->spinlock);
338 ready = (dlm->reco.new_master != O2NM_INVALID_NODE_NUM);
339 spin_unlock(&dlm->spinlock);
340 return ready;
341 }
342
343 /* returns true if node is no longer in the domain
344 * could be dead or just not joined */
345 int dlm_is_node_dead(struct dlm_ctxt *dlm, u8 node)
346 {
347 int dead;
348 spin_lock(&dlm->spinlock);
349 dead = !test_bit(node, dlm->domain_map);
350 spin_unlock(&dlm->spinlock);
351 return dead;
352 }
353
354 /* returns true if node is no longer in the domain
355 * could be dead or just not joined */
356 static int dlm_is_node_recovered(struct dlm_ctxt *dlm, u8 node)
357 {
358 int recovered;
359 spin_lock(&dlm->spinlock);
360 recovered = !test_bit(node, dlm->recovery_map);
361 spin_unlock(&dlm->spinlock);
362 return recovered;
363 }
364
365
366 int dlm_wait_for_node_death(struct dlm_ctxt *dlm, u8 node, int timeout)
367 {
368 if (timeout) {
369 mlog(ML_NOTICE, "%s: waiting %dms for notification of "
370 "death of node %u\n", dlm->name, timeout, node);
371 wait_event_timeout(dlm->dlm_reco_thread_wq,
372 dlm_is_node_dead(dlm, node),
373 msecs_to_jiffies(timeout));
374 } else {
375 mlog(ML_NOTICE, "%s: waiting indefinitely for notification "
376 "of death of node %u\n", dlm->name, node);
377 wait_event(dlm->dlm_reco_thread_wq,
378 dlm_is_node_dead(dlm, node));
379 }
380 /* for now, return 0 */
381 return 0;
382 }
383
384 int dlm_wait_for_node_recovery(struct dlm_ctxt *dlm, u8 node, int timeout)
385 {
386 if (timeout) {
387 mlog(0, "%s: waiting %dms for notification of "
388 "recovery of node %u\n", dlm->name, timeout, node);
389 wait_event_timeout(dlm->dlm_reco_thread_wq,
390 dlm_is_node_recovered(dlm, node),
391 msecs_to_jiffies(timeout));
392 } else {
393 mlog(0, "%s: waiting indefinitely for notification "
394 "of recovery of node %u\n", dlm->name, node);
395 wait_event(dlm->dlm_reco_thread_wq,
396 dlm_is_node_recovered(dlm, node));
397 }
398 /* for now, return 0 */
399 return 0;
400 }
401
402 /* callers of the top-level api calls (dlmlock/dlmunlock) should
403 * block on the dlm->reco.event when recovery is in progress.
404 * the dlm recovery thread will set this state when it begins
405 * recovering a dead node (as the new master or not) and clear
406 * the state and wake as soon as all affected lock resources have
407 * been marked with the RECOVERY flag */
408 static int dlm_in_recovery(struct dlm_ctxt *dlm)
409 {
410 int in_recovery;
411 spin_lock(&dlm->spinlock);
412 in_recovery = !!(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
413 spin_unlock(&dlm->spinlock);
414 return in_recovery;
415 }
416
417
418 void dlm_wait_for_recovery(struct dlm_ctxt *dlm)
419 {
420 if (dlm_in_recovery(dlm)) {
421 mlog(0, "%s: reco thread %d in recovery: "
422 "state=%d, master=%u, dead=%u\n",
423 dlm->name, dlm->dlm_reco_thread_task->pid,
424 dlm->reco.state, dlm->reco.new_master,
425 dlm->reco.dead_node);
426 }
427 wait_event(dlm->reco.event, !dlm_in_recovery(dlm));
428 }
429
430 static void dlm_begin_recovery(struct dlm_ctxt *dlm)
431 {
432 spin_lock(&dlm->spinlock);
433 BUG_ON(dlm->reco.state & DLM_RECO_STATE_ACTIVE);
434 dlm->reco.state |= DLM_RECO_STATE_ACTIVE;
435 spin_unlock(&dlm->spinlock);
436 }
437
438 static void dlm_end_recovery(struct dlm_ctxt *dlm)
439 {
440 spin_lock(&dlm->spinlock);
441 BUG_ON(!(dlm->reco.state & DLM_RECO_STATE_ACTIVE));
442 dlm->reco.state &= ~DLM_RECO_STATE_ACTIVE;
443 spin_unlock(&dlm->spinlock);
444 wake_up(&dlm->reco.event);
445 }
446
447 static int dlm_do_recovery(struct dlm_ctxt *dlm)
448 {
449 int status = 0;
450 int ret;
451
452 spin_lock(&dlm->spinlock);
453
454 /* check to see if the new master has died */
455 if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM &&
456 test_bit(dlm->reco.new_master, dlm->recovery_map)) {
457 mlog(0, "new master %u died while recovering %u!\n",
458 dlm->reco.new_master, dlm->reco.dead_node);
459 /* unset the new_master, leave dead_node */
460 dlm_set_reco_master(dlm, O2NM_INVALID_NODE_NUM);
461 }
462
463 /* select a target to recover */
464 if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
465 int bit;
466
467 bit = find_next_bit (dlm->recovery_map, O2NM_MAX_NODES+1, 0);
468 if (bit >= O2NM_MAX_NODES || bit < 0)
469 dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
470 else
471 dlm_set_reco_dead_node(dlm, bit);
472 } else if (!test_bit(dlm->reco.dead_node, dlm->recovery_map)) {
473 /* BUG? */
474 mlog(ML_ERROR, "dead_node %u no longer in recovery map!\n",
475 dlm->reco.dead_node);
476 dlm_set_reco_dead_node(dlm, O2NM_INVALID_NODE_NUM);
477 }
478
479 if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
480 // mlog(0, "nothing to recover! sleeping now!\n");
481 spin_unlock(&dlm->spinlock);
482 /* return to main thread loop and sleep. */
483 return 0;
484 }
485 mlog(0, "%s(%d):recovery thread found node %u in the recovery map!\n",
486 dlm->name, dlm->dlm_reco_thread_task->pid,
487 dlm->reco.dead_node);
488 spin_unlock(&dlm->spinlock);
489
490 /* take write barrier */
491 /* (stops the list reshuffling thread, proxy ast handling) */
492 dlm_begin_recovery(dlm);
493
494 if (dlm->reco.new_master == dlm->node_num)
495 goto master_here;
496
497 if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
498 /* choose a new master, returns 0 if this node
499 * is the master, -EEXIST if it's another node.
500 * this does not return until a new master is chosen
501 * or recovery completes entirely. */
502 ret = dlm_pick_recovery_master(dlm);
503 if (!ret) {
504 /* already notified everyone. go. */
505 goto master_here;
506 }
507 mlog(0, "another node will master this recovery session.\n");
508 }
509 mlog(0, "dlm=%s (%d), new_master=%u, this node=%u, dead_node=%u\n",
510 dlm->name, dlm->dlm_reco_thread_task->pid, dlm->reco.new_master,
511 dlm->node_num, dlm->reco.dead_node);
512
513 /* it is safe to start everything back up here
514 * because all of the dead node's lock resources
515 * have been marked as in-recovery */
516 dlm_end_recovery(dlm);
517
518 /* sleep out in main dlm_recovery_thread loop. */
519 return 0;
520
521 master_here:
522 mlog(0, "(%d) mastering recovery of %s:%u here(this=%u)!\n",
523 dlm->dlm_reco_thread_task->pid,
524 dlm->name, dlm->reco.dead_node, dlm->node_num);
525
526 status = dlm_remaster_locks(dlm, dlm->reco.dead_node);
527 if (status < 0) {
528 /* we should never hit this anymore */
529 mlog(ML_ERROR, "error %d remastering locks for node %u, "
530 "retrying.\n", status, dlm->reco.dead_node);
531 /* yield a bit to allow any final network messages
532 * to get handled on remaining nodes */
533 msleep(100);
534 } else {
535 /* success! see if any other nodes need recovery */
536 mlog(0, "DONE mastering recovery of %s:%u here(this=%u)!\n",
537 dlm->name, dlm->reco.dead_node, dlm->node_num);
538 dlm_reset_recovery(dlm);
539 }
540 dlm_end_recovery(dlm);
541
542 /* continue and look for another dead node */
543 return -EAGAIN;
544 }
545
546 static int dlm_remaster_locks(struct dlm_ctxt *dlm, u8 dead_node)
547 {
548 int status = 0;
549 struct dlm_reco_node_data *ndata;
550 int all_nodes_done;
551 int destroy = 0;
552 int pass = 0;
553
554 do {
555 /* we have become recovery master. there is no escaping
556 * this, so just keep trying until we get it. */
557 status = dlm_init_recovery_area(dlm, dead_node);
558 if (status < 0) {
559 mlog(ML_ERROR, "%s: failed to alloc recovery area, "
560 "retrying\n", dlm->name);
561 msleep(1000);
562 }
563 } while (status != 0);
564
565 /* safe to access the node data list without a lock, since this
566 * process is the only one to change the list */
567 list_for_each_entry(ndata, &dlm->reco.node_data, list) {
568 BUG_ON(ndata->state != DLM_RECO_NODE_DATA_INIT);
569 ndata->state = DLM_RECO_NODE_DATA_REQUESTING;
570
571 mlog(0, "requesting lock info from node %u\n",
572 ndata->node_num);
573
574 if (ndata->node_num == dlm->node_num) {
575 ndata->state = DLM_RECO_NODE_DATA_DONE;
576 continue;
577 }
578
579 do {
580 status = dlm_request_all_locks(dlm, ndata->node_num,
581 dead_node);
582 if (status < 0) {
583 mlog_errno(status);
584 if (dlm_is_host_down(status)) {
585 /* node died, ignore it for recovery */
586 status = 0;
587 ndata->state = DLM_RECO_NODE_DATA_DEAD;
588 /* wait for the domain map to catch up
589 * with the network state. */
590 wait_event_timeout(dlm->dlm_reco_thread_wq,
591 dlm_is_node_dead(dlm,
592 ndata->node_num),
593 msecs_to_jiffies(1000));
594 mlog(0, "waited 1 sec for %u, "
595 "dead? %s\n", ndata->node_num,
596 dlm_is_node_dead(dlm, ndata->node_num) ?
597 "yes" : "no");
598 } else {
599 /* -ENOMEM on the other node */
600 mlog(0, "%s: node %u returned "
601 "%d during recovery, retrying "
602 "after a short wait\n",
603 dlm->name, ndata->node_num,
604 status);
605 msleep(100);
606 }
607 }
608 } while (status != 0);
609
610 spin_lock(&dlm_reco_state_lock);
611 switch (ndata->state) {
612 case DLM_RECO_NODE_DATA_INIT:
613 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
614 case DLM_RECO_NODE_DATA_REQUESTED:
615 BUG();
616 break;
617 case DLM_RECO_NODE_DATA_DEAD:
618 mlog(0, "node %u died after requesting "
619 "recovery info for node %u\n",
620 ndata->node_num, dead_node);
621 /* fine. don't need this node's info.
622 * continue without it. */
623 break;
624 case DLM_RECO_NODE_DATA_REQUESTING:
625 ndata->state = DLM_RECO_NODE_DATA_REQUESTED;
626 mlog(0, "now receiving recovery data from "
627 "node %u for dead node %u\n",
628 ndata->node_num, dead_node);
629 break;
630 case DLM_RECO_NODE_DATA_RECEIVING:
631 mlog(0, "already receiving recovery data from "
632 "node %u for dead node %u\n",
633 ndata->node_num, dead_node);
634 break;
635 case DLM_RECO_NODE_DATA_DONE:
636 mlog(0, "already DONE receiving recovery data "
637 "from node %u for dead node %u\n",
638 ndata->node_num, dead_node);
639 break;
640 }
641 spin_unlock(&dlm_reco_state_lock);
642 }
643
644 mlog(0, "done requesting all lock info\n");
645
646 /* nodes should be sending reco data now
647 * just need to wait */
648
649 while (1) {
650 /* check all the nodes now to see if we are
651 * done, or if anyone died */
652 all_nodes_done = 1;
653 spin_lock(&dlm_reco_state_lock);
654 list_for_each_entry(ndata, &dlm->reco.node_data, list) {
655 mlog(0, "checking recovery state of node %u\n",
656 ndata->node_num);
657 switch (ndata->state) {
658 case DLM_RECO_NODE_DATA_INIT:
659 case DLM_RECO_NODE_DATA_REQUESTING:
660 mlog(ML_ERROR, "bad ndata state for "
661 "node %u: state=%d\n",
662 ndata->node_num, ndata->state);
663 BUG();
664 break;
665 case DLM_RECO_NODE_DATA_DEAD:
666 mlog(0, "node %u died after "
667 "requesting recovery info for "
668 "node %u\n", ndata->node_num,
669 dead_node);
670 break;
671 case DLM_RECO_NODE_DATA_RECEIVING:
672 case DLM_RECO_NODE_DATA_REQUESTED:
673 mlog(0, "%s: node %u still in state %s\n",
674 dlm->name, ndata->node_num,
675 ndata->state==DLM_RECO_NODE_DATA_RECEIVING ?
676 "receiving" : "requested");
677 all_nodes_done = 0;
678 break;
679 case DLM_RECO_NODE_DATA_DONE:
680 mlog(0, "%s: node %u state is done\n",
681 dlm->name, ndata->node_num);
682 break;
683 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
684 mlog(0, "%s: node %u state is finalize\n",
685 dlm->name, ndata->node_num);
686 break;
687 }
688 }
689 spin_unlock(&dlm_reco_state_lock);
690
691 mlog(0, "pass #%d, all_nodes_done?: %s\n", ++pass,
692 all_nodes_done?"yes":"no");
693 if (all_nodes_done) {
694 int ret;
695
696 /* all nodes are now in DLM_RECO_NODE_DATA_DONE state
697 * just send a finalize message to everyone and
698 * clean up */
699 mlog(0, "all nodes are done! send finalize\n");
700 ret = dlm_send_finalize_reco_message(dlm);
701 if (ret < 0)
702 mlog_errno(ret);
703
704 spin_lock(&dlm->spinlock);
705 dlm_finish_local_lockres_recovery(dlm, dead_node,
706 dlm->node_num);
707 spin_unlock(&dlm->spinlock);
708 mlog(0, "should be done with recovery!\n");
709
710 mlog(0, "finishing recovery of %s at %lu, "
711 "dead=%u, this=%u, new=%u\n", dlm->name,
712 jiffies, dlm->reco.dead_node,
713 dlm->node_num, dlm->reco.new_master);
714 destroy = 1;
715 status = 0;
716 /* rescan everything marked dirty along the way */
717 dlm_kick_thread(dlm, NULL);
718 break;
719 }
720 /* wait to be signalled, with periodic timeout
721 * to check for node death */
722 wait_event_interruptible_timeout(dlm->dlm_reco_thread_wq,
723 kthread_should_stop(),
724 msecs_to_jiffies(DLM_RECO_THREAD_TIMEOUT_MS));
725
726 }
727
728 if (destroy)
729 dlm_destroy_recovery_area(dlm, dead_node);
730
731 mlog_exit(status);
732 return status;
733 }
734
735 static int dlm_init_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
736 {
737 int num=0;
738 struct dlm_reco_node_data *ndata;
739
740 spin_lock(&dlm->spinlock);
741 memcpy(dlm->reco.node_map, dlm->domain_map, sizeof(dlm->domain_map));
742 /* nodes can only be removed (by dying) after dropping
743 * this lock, and death will be trapped later, so this should do */
744 spin_unlock(&dlm->spinlock);
745
746 while (1) {
747 num = find_next_bit (dlm->reco.node_map, O2NM_MAX_NODES, num);
748 if (num >= O2NM_MAX_NODES) {
749 break;
750 }
751 BUG_ON(num == dead_node);
752
753 ndata = kzalloc(sizeof(*ndata), GFP_NOFS);
754 if (!ndata) {
755 dlm_destroy_recovery_area(dlm, dead_node);
756 return -ENOMEM;
757 }
758 ndata->node_num = num;
759 ndata->state = DLM_RECO_NODE_DATA_INIT;
760 spin_lock(&dlm_reco_state_lock);
761 list_add_tail(&ndata->list, &dlm->reco.node_data);
762 spin_unlock(&dlm_reco_state_lock);
763 num++;
764 }
765
766 return 0;
767 }
768
769 static void dlm_destroy_recovery_area(struct dlm_ctxt *dlm, u8 dead_node)
770 {
771 struct dlm_reco_node_data *ndata, *next;
772 LIST_HEAD(tmplist);
773
774 spin_lock(&dlm_reco_state_lock);
775 list_splice_init(&dlm->reco.node_data, &tmplist);
776 spin_unlock(&dlm_reco_state_lock);
777
778 list_for_each_entry_safe(ndata, next, &tmplist, list) {
779 list_del_init(&ndata->list);
780 kfree(ndata);
781 }
782 }
783
784 static int dlm_request_all_locks(struct dlm_ctxt *dlm, u8 request_from,
785 u8 dead_node)
786 {
787 struct dlm_lock_request lr;
788 enum dlm_status ret;
789
790 mlog(0, "\n");
791
792
793 mlog(0, "dlm_request_all_locks: dead node is %u, sending request "
794 "to %u\n", dead_node, request_from);
795
796 memset(&lr, 0, sizeof(lr));
797 lr.node_idx = dlm->node_num;
798 lr.dead_node = dead_node;
799
800 // send message
801 ret = DLM_NOLOCKMGR;
802 ret = o2net_send_message(DLM_LOCK_REQUEST_MSG, dlm->key,
803 &lr, sizeof(lr), request_from, NULL);
804
805 /* negative status is handled by caller */
806 if (ret < 0)
807 mlog_errno(ret);
808
809 // return from here, then
810 // sleep until all received or error
811 return ret;
812
813 }
814
815 int dlm_request_all_locks_handler(struct o2net_msg *msg, u32 len, void *data,
816 void **ret_data)
817 {
818 struct dlm_ctxt *dlm = data;
819 struct dlm_lock_request *lr = (struct dlm_lock_request *)msg->buf;
820 char *buf = NULL;
821 struct dlm_work_item *item = NULL;
822
823 if (!dlm_grab(dlm))
824 return -EINVAL;
825
826 if (lr->dead_node != dlm->reco.dead_node) {
827 mlog(ML_ERROR, "%s: node %u sent dead_node=%u, but local "
828 "dead_node is %u\n", dlm->name, lr->node_idx,
829 lr->dead_node, dlm->reco.dead_node);
830 dlm_print_reco_node_status(dlm);
831 /* this is a hack */
832 dlm_put(dlm);
833 return -ENOMEM;
834 }
835 BUG_ON(lr->dead_node != dlm->reco.dead_node);
836
837 item = kzalloc(sizeof(*item), GFP_NOFS);
838 if (!item) {
839 dlm_put(dlm);
840 return -ENOMEM;
841 }
842
843 /* this will get freed by dlm_request_all_locks_worker */
844 buf = (char *) __get_free_page(GFP_NOFS);
845 if (!buf) {
846 kfree(item);
847 dlm_put(dlm);
848 return -ENOMEM;
849 }
850
851 /* queue up work for dlm_request_all_locks_worker */
852 dlm_grab(dlm); /* get an extra ref for the work item */
853 dlm_init_work_item(dlm, item, dlm_request_all_locks_worker, buf);
854 item->u.ral.reco_master = lr->node_idx;
855 item->u.ral.dead_node = lr->dead_node;
856 spin_lock(&dlm->work_lock);
857 list_add_tail(&item->list, &dlm->work_list);
858 spin_unlock(&dlm->work_lock);
859 queue_work(dlm->dlm_worker, &dlm->dispatched_work);
860
861 dlm_put(dlm);
862 return 0;
863 }
864
865 static void dlm_request_all_locks_worker(struct dlm_work_item *item, void *data)
866 {
867 struct dlm_migratable_lockres *mres;
868 struct dlm_lock_resource *res;
869 struct dlm_ctxt *dlm;
870 LIST_HEAD(resources);
871 int ret;
872 u8 dead_node, reco_master;
873 int skip_all_done = 0;
874
875 dlm = item->dlm;
876 dead_node = item->u.ral.dead_node;
877 reco_master = item->u.ral.reco_master;
878 mres = (struct dlm_migratable_lockres *)data;
879
880 mlog(0, "%s: recovery worker started, dead=%u, master=%u\n",
881 dlm->name, dead_node, reco_master);
882
883 if (dead_node != dlm->reco.dead_node ||
884 reco_master != dlm->reco.new_master) {
885 /* worker could have been created before the recovery master
886 * died. if so, do not continue, but do not error. */
887 if (dlm->reco.new_master == O2NM_INVALID_NODE_NUM) {
888 mlog(ML_NOTICE, "%s: will not send recovery state, "
889 "recovery master %u died, thread=(dead=%u,mas=%u)"
890 " current=(dead=%u,mas=%u)\n", dlm->name,
891 reco_master, dead_node, reco_master,
892 dlm->reco.dead_node, dlm->reco.new_master);
893 } else {
894 mlog(ML_NOTICE, "%s: reco state invalid: reco(dead=%u, "
895 "master=%u), request(dead=%u, master=%u)\n",
896 dlm->name, dlm->reco.dead_node,
897 dlm->reco.new_master, dead_node, reco_master);
898 }
899 goto leave;
900 }
901
902 /* lock resources should have already been moved to the
903 * dlm->reco.resources list. now move items from that list
904 * to a temp list if the dead owner matches. note that the
905 * whole cluster recovers only one node at a time, so we
906 * can safely move UNKNOWN lock resources for each recovery
907 * session. */
908 dlm_move_reco_locks_to_list(dlm, &resources, dead_node);
909
910 /* now we can begin blasting lockreses without the dlm lock */
911
912 /* any errors returned will be due to the new_master dying,
913 * the dlm_reco_thread should detect this */
914 list_for_each_entry(res, &resources, recovering) {
915 ret = dlm_send_one_lockres(dlm, res, mres, reco_master,
916 DLM_MRES_RECOVERY);
917 if (ret < 0) {
918 mlog(ML_ERROR, "%s: node %u went down while sending "
919 "recovery state for dead node %u, ret=%d\n", dlm->name,
920 reco_master, dead_node, ret);
921 skip_all_done = 1;
922 break;
923 }
924 }
925
926 /* move the resources back to the list */
927 spin_lock(&dlm->spinlock);
928 list_splice_init(&resources, &dlm->reco.resources);
929 spin_unlock(&dlm->spinlock);
930
931 if (!skip_all_done) {
932 ret = dlm_send_all_done_msg(dlm, dead_node, reco_master);
933 if (ret < 0) {
934 mlog(ML_ERROR, "%s: node %u went down while sending "
935 "recovery all-done for dead node %u, ret=%d\n",
936 dlm->name, reco_master, dead_node, ret);
937 }
938 }
939 leave:
940 free_page((unsigned long)data);
941 }
942
943
944 static int dlm_send_all_done_msg(struct dlm_ctxt *dlm, u8 dead_node, u8 send_to)
945 {
946 int ret, tmpret;
947 struct dlm_reco_data_done done_msg;
948
949 memset(&done_msg, 0, sizeof(done_msg));
950 done_msg.node_idx = dlm->node_num;
951 done_msg.dead_node = dead_node;
952 mlog(0, "sending DATA DONE message to %u, "
953 "my node=%u, dead node=%u\n", send_to, done_msg.node_idx,
954 done_msg.dead_node);
955
956 ret = o2net_send_message(DLM_RECO_DATA_DONE_MSG, dlm->key, &done_msg,
957 sizeof(done_msg), send_to, &tmpret);
958 if (ret < 0) {
959 if (!dlm_is_host_down(ret)) {
960 mlog_errno(ret);
961 mlog(ML_ERROR, "%s: unknown error sending data-done "
962 "to %u\n", dlm->name, send_to);
963 BUG();
964 }
965 } else
966 ret = tmpret;
967 return ret;
968 }
969
970
971 int dlm_reco_data_done_handler(struct o2net_msg *msg, u32 len, void *data,
972 void **ret_data)
973 {
974 struct dlm_ctxt *dlm = data;
975 struct dlm_reco_data_done *done = (struct dlm_reco_data_done *)msg->buf;
976 struct dlm_reco_node_data *ndata = NULL;
977 int ret = -EINVAL;
978
979 if (!dlm_grab(dlm))
980 return -EINVAL;
981
982 mlog(0, "got DATA DONE: dead_node=%u, reco.dead_node=%u, "
983 "node_idx=%u, this node=%u\n", done->dead_node,
984 dlm->reco.dead_node, done->node_idx, dlm->node_num);
985
986 mlog_bug_on_msg((done->dead_node != dlm->reco.dead_node),
987 "Got DATA DONE: dead_node=%u, reco.dead_node=%u, "
988 "node_idx=%u, this node=%u\n", done->dead_node,
989 dlm->reco.dead_node, done->node_idx, dlm->node_num);
990
991 spin_lock(&dlm_reco_state_lock);
992 list_for_each_entry(ndata, &dlm->reco.node_data, list) {
993 if (ndata->node_num != done->node_idx)
994 continue;
995
996 switch (ndata->state) {
997 /* should have moved beyond INIT but not to FINALIZE yet */
998 case DLM_RECO_NODE_DATA_INIT:
999 case DLM_RECO_NODE_DATA_DEAD:
1000 case DLM_RECO_NODE_DATA_FINALIZE_SENT:
1001 mlog(ML_ERROR, "bad ndata state for node %u:"
1002 " state=%d\n", ndata->node_num,
1003 ndata->state);
1004 BUG();
1005 break;
1006 /* these states are possible at this point, anywhere along
1007 * the line of recovery */
1008 case DLM_RECO_NODE_DATA_DONE:
1009 case DLM_RECO_NODE_DATA_RECEIVING:
1010 case DLM_RECO_NODE_DATA_REQUESTED:
1011 case DLM_RECO_NODE_DATA_REQUESTING:
1012 mlog(0, "node %u is DONE sending "
1013 "recovery data!\n",
1014 ndata->node_num);
1015
1016 ndata->state = DLM_RECO_NODE_DATA_DONE;
1017 ret = 0;
1018 break;
1019 }
1020 }
1021 spin_unlock(&dlm_reco_state_lock);
1022
1023 /* wake the recovery thread, some node is done */
1024 if (!ret)
1025 dlm_kick_recovery_thread(dlm);
1026
1027 if (ret < 0)
1028 mlog(ML_ERROR, "failed to find recovery node data for node "
1029 "%u\n", done->node_idx);
1030 dlm_put(dlm);
1031
1032 mlog(0, "leaving reco data done handler, ret=%d\n", ret);
1033 return ret;
1034 }
1035
1036 static void dlm_move_reco_locks_to_list(struct dlm_ctxt *dlm,
1037 struct list_head *list,
1038 u8 dead_node)
1039 {
1040 struct dlm_lock_resource *res, *next;
1041 struct dlm_lock *lock;
1042
1043 spin_lock(&dlm->spinlock);
1044 list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) {
1045 /* always prune any $RECOVERY entries for dead nodes,
1046 * otherwise hangs can occur during later recovery */
1047 if (dlm_is_recovery_lock(res->lockname.name,
1048 res->lockname.len)) {
1049 spin_lock(&res->spinlock);
1050 list_for_each_entry(lock, &res->granted, list) {
1051 if (lock->ml.node == dead_node) {
1052 mlog(0, "AHA! there was "
1053 "a $RECOVERY lock for dead "
1054 "node %u (%s)!\n",
1055 dead_node, dlm->name);
1056 list_del_init(&lock->list);
1057 dlm_lock_put(lock);
1058 break;
1059 }
1060 }
1061 spin_unlock(&res->spinlock);
1062 continue;
1063 }
1064
1065 if (res->owner == dead_node) {
1066 mlog(0, "found lockres owned by dead node while "
1067 "doing recovery for node %u. sending it.\n",
1068 dead_node);
1069 list_move_tail(&res->recovering, list);
1070 } else if (res->owner == DLM_LOCK_RES_OWNER_UNKNOWN) {
1071 mlog(0, "found UNKNOWN owner while doing recovery "
1072 "for node %u. sending it.\n", dead_node);
1073 list_move_tail(&res->recovering, list);
1074 }
1075 }
1076 spin_unlock(&dlm->spinlock);
1077 }
1078
1079 static inline int dlm_num_locks_in_lockres(struct dlm_lock_resource *res)
1080 {
1081 int total_locks = 0;
1082 struct list_head *iter, *queue = &res->granted;
1083 int i;
1084
1085 for (i=0; i<3; i++) {
1086 list_for_each(iter, queue)
1087 total_locks++;
1088 queue++;
1089 }
1090 return total_locks;
1091 }
1092
1093
1094 static int dlm_send_mig_lockres_msg(struct dlm_ctxt *dlm,
1095 struct dlm_migratable_lockres *mres,
1096 u8 send_to,
1097 struct dlm_lock_resource *res,
1098 int total_locks)
1099 {
1100 u64 mig_cookie = be64_to_cpu(mres->mig_cookie);
1101 int mres_total_locks = be32_to_cpu(mres->total_locks);
1102 int sz, ret = 0, status = 0;
1103 u8 orig_flags = mres->flags,
1104 orig_master = mres->master;
1105
1106 BUG_ON(mres->num_locks > DLM_MAX_MIGRATABLE_LOCKS);
1107 if (!mres->num_locks)
1108 return 0;
1109
1110 sz = sizeof(struct dlm_migratable_lockres) +
1111 (mres->num_locks * sizeof(struct dlm_migratable_lock));
1112
1113 /* add an all-done flag if we reached the last lock */
1114 orig_flags = mres->flags;
1115 BUG_ON(total_locks > mres_total_locks);
1116 if (total_locks == mres_total_locks)
1117 mres->flags |= DLM_MRES_ALL_DONE;
1118
1119 mlog(0, "%s:%.*s: sending mig lockres (%s) to %u\n",
1120 dlm->name, res->lockname.len, res->lockname.name,
1121 orig_flags & DLM_MRES_MIGRATION ? "migrate" : "recovery",
1122 send_to);
1123
1124 /* send it */
1125 ret = o2net_send_message(DLM_MIG_LOCKRES_MSG, dlm->key, mres,
1126 sz, send_to, &status);
1127 if (ret < 0) {
1128 /* XXX: negative status is not handled.
1129 * this will end up killing this node. */
1130 mlog_errno(ret);
1131 } else {
1132 /* might get an -ENOMEM back here */
1133 ret = status;
1134 if (ret < 0) {
1135 mlog_errno(ret);
1136
1137 if (ret == -EFAULT) {
1138 mlog(ML_ERROR, "node %u told me to kill "
1139 "myself!\n", send_to);
1140 BUG();
1141 }
1142 }
1143 }
1144
1145 /* zero and reinit the message buffer */
1146 dlm_init_migratable_lockres(mres, res->lockname.name,
1147 res->lockname.len, mres_total_locks,
1148 mig_cookie, orig_flags, orig_master);
1149 return ret;
1150 }
1151
1152 static void dlm_init_migratable_lockres(struct dlm_migratable_lockres *mres,
1153 const char *lockname, int namelen,
1154 int total_locks, u64 cookie,
1155 u8 flags, u8 master)
1156 {
1157 /* mres here is one full page */
1158 clear_page(mres);
1159 mres->lockname_len = namelen;
1160 memcpy(mres->lockname, lockname, namelen);
1161 mres->num_locks = 0;
1162 mres->total_locks = cpu_to_be32(total_locks);
1163 mres->mig_cookie = cpu_to_be64(cookie);
1164 mres->flags = flags;
1165 mres->master = master;
1166 }
1167
1168
1169 /* returns 1 if this lock fills the network structure,
1170 * 0 otherwise */
1171 static int dlm_add_lock_to_array(struct dlm_lock *lock,
1172 struct dlm_migratable_lockres *mres, int queue)
1173 {
1174 struct dlm_migratable_lock *ml;
1175 int lock_num = mres->num_locks;
1176
1177 ml = &(mres->ml[lock_num]);
1178 ml->cookie = lock->ml.cookie;
1179 ml->type = lock->ml.type;
1180 ml->convert_type = lock->ml.convert_type;
1181 ml->highest_blocked = lock->ml.highest_blocked;
1182 ml->list = queue;
1183 if (lock->lksb) {
1184 ml->flags = lock->lksb->flags;
1185 /* send our current lvb */
1186 if (ml->type == LKM_EXMODE ||
1187 ml->type == LKM_PRMODE) {
1188 /* if it is already set, this had better be a PR
1189 * and it has to match */
1190 if (!dlm_lvb_is_empty(mres->lvb) &&
1191 (ml->type == LKM_EXMODE ||
1192 memcmp(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN))) {
1193 mlog(ML_ERROR, "mismatched lvbs!\n");
1194 __dlm_print_one_lock_resource(lock->lockres);
1195 BUG();
1196 }
1197 memcpy(mres->lvb, lock->lksb->lvb, DLM_LVB_LEN);
1198 }
1199 }
1200 ml->node = lock->ml.node;
1201 mres->num_locks++;
1202 /* we reached the max, send this network message */
1203 if (mres->num_locks == DLM_MAX_MIGRATABLE_LOCKS)
1204 return 1;
1205 return 0;
1206 }
1207
1208 static void dlm_add_dummy_lock(struct dlm_ctxt *dlm,
1209 struct dlm_migratable_lockres *mres)
1210 {
1211 struct dlm_lock dummy;
1212 memset(&dummy, 0, sizeof(dummy));
1213 dummy.ml.cookie = 0;
1214 dummy.ml.type = LKM_IVMODE;
1215 dummy.ml.convert_type = LKM_IVMODE;
1216 dummy.ml.highest_blocked = LKM_IVMODE;
1217 dummy.lksb = NULL;
1218 dummy.ml.node = dlm->node_num;
1219 dlm_add_lock_to_array(&dummy, mres, DLM_BLOCKED_LIST);
1220 }
1221
1222 static inline int dlm_is_dummy_lock(struct dlm_ctxt *dlm,
1223 struct dlm_migratable_lock *ml,
1224 u8 *nodenum)
1225 {
1226 if (unlikely(ml->cookie == 0 &&
1227 ml->type == LKM_IVMODE &&
1228 ml->convert_type == LKM_IVMODE &&
1229 ml->highest_blocked == LKM_IVMODE &&
1230 ml->list == DLM_BLOCKED_LIST)) {
1231 *nodenum = ml->node;
1232 return 1;
1233 }
1234 return 0;
1235 }
1236
1237 int dlm_send_one_lockres(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
1238 struct dlm_migratable_lockres *mres,
1239 u8 send_to, u8 flags)
1240 {
1241 struct list_head *queue;
1242 int total_locks, i;
1243 u64 mig_cookie = 0;
1244 struct dlm_lock *lock;
1245 int ret = 0;
1246
1247 BUG_ON(!(flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
1248
1249 mlog(0, "sending to %u\n", send_to);
1250
1251 total_locks = dlm_num_locks_in_lockres(res);
1252 if (total_locks > DLM_MAX_MIGRATABLE_LOCKS) {
1253 /* rare, but possible */
1254 mlog(0, "argh. lockres has %d locks. this will "
1255 "require more than one network packet to "
1256 "migrate\n", total_locks);
1257 mig_cookie = dlm_get_next_mig_cookie();
1258 }
1259
1260 dlm_init_migratable_lockres(mres, res->lockname.name,
1261 res->lockname.len, total_locks,
1262 mig_cookie, flags, res->owner);
1263
1264 total_locks = 0;
1265 for (i=DLM_GRANTED_LIST; i<=DLM_BLOCKED_LIST; i++) {
1266 queue = dlm_list_idx_to_ptr(res, i);
1267 list_for_each_entry(lock, queue, list) {
1268 /* add another lock. */
1269 total_locks++;
1270 if (!dlm_add_lock_to_array(lock, mres, i))
1271 continue;
1272
1273 /* this filled the lock message,
1274 * we must send it immediately. */
1275 ret = dlm_send_mig_lockres_msg(dlm, mres, send_to,
1276 res, total_locks);
1277 if (ret < 0)
1278 goto error;
1279 }
1280 }
1281 if (total_locks == 0) {
1282 /* send a dummy lock to indicate a mastery reference only */
1283 mlog(0, "%s:%.*s: sending dummy lock to %u, %s\n",
1284 dlm->name, res->lockname.len, res->lockname.name,
1285 send_to, flags & DLM_MRES_RECOVERY ? "recovery" :
1286 "migration");
1287 dlm_add_dummy_lock(dlm, mres);
1288 }
1289 /* flush any remaining locks */
1290 ret = dlm_send_mig_lockres_msg(dlm, mres, send_to, res, total_locks);
1291 if (ret < 0)
1292 goto error;
1293 return ret;
1294
1295 error:
1296 mlog(ML_ERROR, "%s: dlm_send_mig_lockres_msg returned %d\n",
1297 dlm->name, ret);
1298 if (!dlm_is_host_down(ret))
1299 BUG();
1300 mlog(0, "%s: node %u went down while sending %s "
1301 "lockres %.*s\n", dlm->name, send_to,
1302 flags & DLM_MRES_RECOVERY ? "recovery" : "migration",
1303 res->lockname.len, res->lockname.name);
1304 return ret;
1305 }
1306
1307
1308
1309 /*
1310 * this message will contain no more than one page worth of
1311 * recovery data, and it will work on only one lockres.
1312 * there may be many locks in this page, and we may need to wait
1313 * for additional packets to complete all the locks (rare, but
1314 * possible).
1315 */
1316 /*
1317 * NOTE: the allocation error cases here are scary
1318 * we really cannot afford to fail an alloc in recovery
1319 * do we spin? returning an error only delays the problem really
1320 */
1321
1322 int dlm_mig_lockres_handler(struct o2net_msg *msg, u32 len, void *data,
1323 void **ret_data)
1324 {
1325 struct dlm_ctxt *dlm = data;
1326 struct dlm_migratable_lockres *mres =
1327 (struct dlm_migratable_lockres *)msg->buf;
1328 int ret = 0;
1329 u8 real_master;
1330 char *buf = NULL;
1331 struct dlm_work_item *item = NULL;
1332 struct dlm_lock_resource *res = NULL;
1333
1334 if (!dlm_grab(dlm))
1335 return -EINVAL;
1336
1337 BUG_ON(!(mres->flags & (DLM_MRES_RECOVERY|DLM_MRES_MIGRATION)));
1338
1339 real_master = mres->master;
1340 if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1341 /* cannot migrate a lockres with no master */
1342 BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
1343 }
1344
1345 mlog(0, "%s message received from node %u\n",
1346 (mres->flags & DLM_MRES_RECOVERY) ?
1347 "recovery" : "migration", mres->master);
1348 if (mres->flags & DLM_MRES_ALL_DONE)
1349 mlog(0, "all done flag. all lockres data received!\n");
1350
1351 ret = -ENOMEM;
1352 buf = kmalloc(be16_to_cpu(msg->data_len), GFP_NOFS);
1353 item = kzalloc(sizeof(*item), GFP_NOFS);
1354 if (!buf || !item)
1355 goto leave;
1356
1357 /* lookup the lock to see if we have a secondary queue for this
1358 * already... just add the locks in and this will have its owner
1359 * and RECOVERY flag changed when it completes. */
1360 res = dlm_lookup_lockres(dlm, mres->lockname, mres->lockname_len);
1361 if (res) {
1362 /* this will get a ref on res */
1363 /* mark it as recovering/migrating and hash it */
1364 spin_lock(&res->spinlock);
1365 if (mres->flags & DLM_MRES_RECOVERY) {
1366 res->state |= DLM_LOCK_RES_RECOVERING;
1367 } else {
1368 if (res->state & DLM_LOCK_RES_MIGRATING) {
1369 /* this is at least the second
1370 * lockres message */
1371 mlog(0, "lock %.*s is already migrating\n",
1372 mres->lockname_len,
1373 mres->lockname);
1374 } else if (res->state & DLM_LOCK_RES_RECOVERING) {
1375 /* caller should BUG */
1376 mlog(ML_ERROR, "node is attempting to migrate "
1377 "lock %.*s, but marked as recovering!\n",
1378 mres->lockname_len, mres->lockname);
1379 ret = -EFAULT;
1380 spin_unlock(&res->spinlock);
1381 goto leave;
1382 }
1383 res->state |= DLM_LOCK_RES_MIGRATING;
1384 }
1385 spin_unlock(&res->spinlock);
1386 } else {
1387 /* need to allocate, just like if it was
1388 * mastered here normally */
1389 res = dlm_new_lockres(dlm, mres->lockname, mres->lockname_len);
1390 if (!res)
1391 goto leave;
1392
1393 /* to match the ref that we would have gotten if
1394 * dlm_lookup_lockres had succeeded */
1395 dlm_lockres_get(res);
1396
1397 /* mark it as recovering/migrating and hash it */
1398 if (mres->flags & DLM_MRES_RECOVERY)
1399 res->state |= DLM_LOCK_RES_RECOVERING;
1400 else
1401 res->state |= DLM_LOCK_RES_MIGRATING;
1402
1403 spin_lock(&dlm->spinlock);
1404 __dlm_insert_lockres(dlm, res);
1405 spin_unlock(&dlm->spinlock);
1406
1407 /* now that the new lockres is inserted,
1408 * make it usable by other processes */
1409 spin_lock(&res->spinlock);
1410 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
1411 spin_unlock(&res->spinlock);
1412 wake_up(&res->wq);
1413
1414 /* add an extra ref for just-allocated lockres
1415 * otherwise the lockres will be purged immediately */
1416 dlm_lockres_get(res);
1417 }
1418
1419 /* at this point we have allocated everything we need,
1420 * and we have a hashed lockres with an extra ref and
1421 * the proper res->state flags. */
1422 ret = 0;
1423 spin_lock(&res->spinlock);
1424 /* drop this either when master requery finds a different master
1425 * or when a lock is added by the recovery worker */
1426 dlm_lockres_grab_inflight_ref(dlm, res);
1427 if (mres->master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1428 /* migration cannot have an unknown master */
1429 BUG_ON(!(mres->flags & DLM_MRES_RECOVERY));
1430 mlog(0, "recovery has passed me a lockres with an "
1431 "unknown owner.. will need to requery: "
1432 "%.*s\n", mres->lockname_len, mres->lockname);
1433 } else {
1434 /* take a reference now to pin the lockres, drop it
1435 * when locks are added in the worker */
1436 dlm_change_lockres_owner(dlm, res, dlm->node_num);
1437 }
1438 spin_unlock(&res->spinlock);
1439
1440 /* queue up work for dlm_mig_lockres_worker */
1441 dlm_grab(dlm); /* get an extra ref for the work item */
1442 memcpy(buf, msg->buf, be16_to_cpu(msg->data_len)); /* copy the whole message */
1443 dlm_init_work_item(dlm, item, dlm_mig_lockres_worker, buf);
1444 item->u.ml.lockres = res; /* already have a ref */
1445 item->u.ml.real_master = real_master;
1446 spin_lock(&dlm->work_lock);
1447 list_add_tail(&item->list, &dlm->work_list);
1448 spin_unlock(&dlm->work_lock);
1449 queue_work(dlm->dlm_worker, &dlm->dispatched_work);
1450
1451 leave:
1452 dlm_put(dlm);
1453 if (ret < 0) {
1454 if (buf)
1455 kfree(buf);
1456 if (item)
1457 kfree(item);
1458 }
1459
1460 mlog_exit(ret);
1461 return ret;
1462 }
1463
1464
1465 static void dlm_mig_lockres_worker(struct dlm_work_item *item, void *data)
1466 {
1467 struct dlm_ctxt *dlm = data;
1468 struct dlm_migratable_lockres *mres;
1469 int ret = 0;
1470 struct dlm_lock_resource *res;
1471 u8 real_master;
1472
1473 dlm = item->dlm;
1474 mres = (struct dlm_migratable_lockres *)data;
1475
1476 res = item->u.ml.lockres;
1477 real_master = item->u.ml.real_master;
1478
1479 if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1480 /* this case is super-rare. only occurs if
1481 * node death happens during migration. */
1482 again:
1483 ret = dlm_lockres_master_requery(dlm, res, &real_master);
1484 if (ret < 0) {
1485 mlog(0, "dlm_lockres_master_requery ret=%d\n",
1486 ret);
1487 goto again;
1488 }
1489 if (real_master == DLM_LOCK_RES_OWNER_UNKNOWN) {
1490 mlog(0, "lockres %.*s not claimed. "
1491 "this node will take it.\n",
1492 res->lockname.len, res->lockname.name);
1493 } else {
1494 spin_lock(&res->spinlock);
1495 dlm_lockres_drop_inflight_ref(dlm, res);
1496 spin_unlock(&res->spinlock);
1497 mlog(0, "master needs to respond to sender "
1498 "that node %u still owns %.*s\n",
1499 real_master, res->lockname.len,
1500 res->lockname.name);
1501 /* cannot touch this lockres */
1502 goto leave;
1503 }
1504 }
1505
1506 ret = dlm_process_recovery_data(dlm, res, mres);
1507 if (ret < 0)
1508 mlog(0, "dlm_process_recovery_data returned %d\n", ret);
1509 else
1510 mlog(0, "dlm_process_recovery_data succeeded\n");
1511
1512 if ((mres->flags & (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) ==
1513 (DLM_MRES_MIGRATION|DLM_MRES_ALL_DONE)) {
1514 ret = dlm_finish_migration(dlm, res, mres->master);
1515 if (ret < 0)
1516 mlog_errno(ret);
1517 }
1518
1519 leave:
1520 kfree(data);
1521 mlog_exit(ret);
1522 }
1523
1524
1525
1526 static int dlm_lockres_master_requery(struct dlm_ctxt *dlm,
1527 struct dlm_lock_resource *res,
1528 u8 *real_master)
1529 {
1530 struct dlm_node_iter iter;
1531 int nodenum;
1532 int ret = 0;
1533
1534 *real_master = DLM_LOCK_RES_OWNER_UNKNOWN;
1535
1536 /* we only reach here if one of the two nodes in a
1537 * migration died while the migration was in progress.
1538 * at this point we need to requery the master. we
1539 * know that the new_master got as far as creating
1540 * an mle on at least one node, but we do not know
1541 * if any nodes had actually cleared the mle and set
1542 * the master to the new_master. the old master
1543 * is supposed to set the owner to UNKNOWN in the
1544 * event of a new_master death, so the only possible
1545 * responses that we can get from nodes here are
1546 * that the master is new_master, or that the master
1547 * is UNKNOWN.
1548 * if all nodes come back with UNKNOWN then we know
1549 * the lock needs remastering here.
1550 * if any node comes back with a valid master, check
1551 * to see if that master is the one that we are
1552 * recovering. if so, then the new_master died and
1553 * we need to remaster this lock. if not, then the
1554 * new_master survived and that node will respond to
1555 * other nodes about the owner.
1556 * if there is an owner, this node needs to dump this
1557 * lockres and alert the sender that this lockres
1558 * was rejected. */
1559 spin_lock(&dlm->spinlock);
1560 dlm_node_iter_init(dlm->domain_map, &iter);
1561 spin_unlock(&dlm->spinlock);
1562
1563 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
1564 /* do not send to self */
1565 if (nodenum == dlm->node_num)
1566 continue;
1567 ret = dlm_do_master_requery(dlm, res, nodenum, real_master);
1568 if (ret < 0) {
1569 mlog_errno(ret);
1570 if (!dlm_is_host_down(ret))
1571 BUG();
1572 /* host is down, so answer for that node would be
1573 * DLM_LOCK_RES_OWNER_UNKNOWN. continue. */
1574 }
1575 if (*real_master != DLM_LOCK_RES_OWNER_UNKNOWN) {
1576 mlog(0, "lock master is %u\n", *real_master);
1577 break;
1578 }
1579 }
1580 return ret;
1581 }
1582
1583
1584 int dlm_do_master_requery(struct dlm_ctxt *dlm, struct dlm_lock_resource *res,
1585 u8 nodenum, u8 *real_master)
1586 {
1587 int ret = -EINVAL;
1588 struct dlm_master_requery req;
1589 int status = DLM_LOCK_RES_OWNER_UNKNOWN;
1590
1591 memset(&req, 0, sizeof(req));
1592 req.node_idx = dlm->node_num;
1593 req.namelen = res->lockname.len;
1594 memcpy(req.name, res->lockname.name, res->lockname.len);
1595
1596 ret = o2net_send_message(DLM_MASTER_REQUERY_MSG, dlm->key,
1597 &req, sizeof(req), nodenum, &status);
1598 /* XXX: negative status not handled properly here. */
1599 if (ret < 0)
1600 mlog_errno(ret);
1601 else {
1602 BUG_ON(status < 0);
1603 BUG_ON(status > DLM_LOCK_RES_OWNER_UNKNOWN);
1604 *real_master = (u8) (status & 0xff);
1605 mlog(0, "node %u responded to master requery with %u\n",
1606 nodenum, *real_master);
1607 ret = 0;
1608 }
1609 return ret;
1610 }
1611
1612
1613 /* this function cannot error, so unless the sending
1614 * or receiving of the message failed, the owner can
1615 * be trusted */
1616 int dlm_master_requery_handler(struct o2net_msg *msg, u32 len, void *data,
1617 void **ret_data)
1618 {
1619 struct dlm_ctxt *dlm = data;
1620 struct dlm_master_requery *req = (struct dlm_master_requery *)msg->buf;
1621 struct dlm_lock_resource *res = NULL;
1622 unsigned int hash;
1623 int master = DLM_LOCK_RES_OWNER_UNKNOWN;
1624 u32 flags = DLM_ASSERT_MASTER_REQUERY;
1625
1626 if (!dlm_grab(dlm)) {
1627 /* since the domain has gone away on this
1628 * node, the proper response is UNKNOWN */
1629 return master;
1630 }
1631
1632 hash = dlm_lockid_hash(req->name, req->namelen);
1633
1634 spin_lock(&dlm->spinlock);
1635 res = __dlm_lookup_lockres(dlm, req->name, req->namelen, hash);
1636 if (res) {
1637 spin_lock(&res->spinlock);
1638 master = res->owner;
1639 if (master == dlm->node_num) {
1640 int ret = dlm_dispatch_assert_master(dlm, res,
1641 0, 0, flags);
1642 if (ret < 0) {
1643 mlog_errno(-ENOMEM);
1644 /* retry!? */
1645 BUG();
1646 }
1647 }
1648 spin_unlock(&res->spinlock);
1649 }
1650 spin_unlock(&dlm->spinlock);
1651
1652 dlm_put(dlm);
1653 return master;
1654 }
1655
1656 static inline struct list_head *
1657 dlm_list_num_to_pointer(struct dlm_lock_resource *res, int list_num)
1658 {
1659 struct list_head *ret;
1660 BUG_ON(list_num < 0);
1661 BUG_ON(list_num > 2);
1662 ret = &(res->granted);
1663 ret += list_num;
1664 return ret;
1665 }
1666 /* TODO: do ast flush business
1667 * TODO: do MIGRATING and RECOVERING spinning
1668 */
1669
1670 /*
1671 * NOTE about in-flight requests during migration:
1672 *
1673 * Before attempting the migrate, the master has marked the lockres as
1674 * MIGRATING and then flushed all of its pending ASTS. So any in-flight
1675 * requests either got queued before the MIGRATING flag got set, in which
1676 * case the lock data will reflect the change and a return message is on
1677 * the way, or the request failed to get in before MIGRATING got set. In
1678 * this case, the caller will be told to spin and wait for the MIGRATING
1679 * flag to be dropped, then recheck the master.
1680 * This holds true for the convert, cancel and unlock cases, and since lvb
1681 * updates are tied to these same messages, it applies to lvb updates as
1682 * well. For the lock case, there is no way a lock can be on the master
1683 * queue and not be on the secondary queue since the lock is always added
1684 * locally first. This means that the new target node will never be sent
1685 * a lock that he doesn't already have on the list.
1686 * In total, this means that the local lock is correct and should not be
1687 * updated to match the one sent by the master. Any messages sent back
1688 * from the master before the MIGRATING flag will bring the lock properly
1689 * up-to-date, and the change will be ordered properly for the waiter.
1690 * We will *not* attempt to modify the lock underneath the waiter.
1691 */
1692
1693 static int dlm_process_recovery_data(struct dlm_ctxt *dlm,
1694 struct dlm_lock_resource *res,
1695 struct dlm_migratable_lockres *mres)
1696 {
1697 struct dlm_migratable_lock *ml;
1698 struct list_head *queue;
1699 struct list_head *tmpq = NULL;
1700 struct dlm_lock *newlock = NULL;
1701 struct dlm_lockstatus *lksb = NULL;
1702 int ret = 0;
1703 int i, j, bad;
1704 struct dlm_lock *lock = NULL;
1705 u8 from = O2NM_MAX_NODES;
1706 unsigned int added = 0;
1707
1708 mlog(0, "running %d locks for this lockres\n", mres->num_locks);
1709 for (i=0; i<mres->num_locks; i++) {
1710 ml = &(mres->ml[i]);
1711
1712 if (dlm_is_dummy_lock(dlm, ml, &from)) {
1713 /* placeholder, just need to set the refmap bit */
1714 BUG_ON(mres->num_locks != 1);
1715 mlog(0, "%s:%.*s: dummy lock for %u\n",
1716 dlm->name, mres->lockname_len, mres->lockname,
1717 from);
1718 spin_lock(&res->spinlock);
1719 dlm_lockres_set_refmap_bit(from, res);
1720 spin_unlock(&res->spinlock);
1721 added++;
1722 break;
1723 }
1724 BUG_ON(ml->highest_blocked != LKM_IVMODE);
1725 newlock = NULL;
1726 lksb = NULL;
1727
1728 queue = dlm_list_num_to_pointer(res, ml->list);
1729 tmpq = NULL;
1730
1731 /* if the lock is for the local node it needs to
1732 * be moved to the proper location within the queue.
1733 * do not allocate a new lock structure. */
1734 if (ml->node == dlm->node_num) {
1735 /* MIGRATION ONLY! */
1736 BUG_ON(!(mres->flags & DLM_MRES_MIGRATION));
1737
1738 spin_lock(&res->spinlock);
1739 for (j = DLM_GRANTED_LIST; j <= DLM_BLOCKED_LIST; j++) {
1740 tmpq = dlm_list_idx_to_ptr(res, j);
1741 list_for_each_entry(lock, tmpq, list) {
1742 if (lock->ml.cookie != ml->cookie)
1743 lock = NULL;
1744 else
1745 break;
1746 }
1747 if (lock)
1748 break;
1749 }
1750
1751 /* lock is always created locally first, and
1752 * destroyed locally last. it must be on the list */
1753 if (!lock) {
1754 __be64 c = ml->cookie;
1755 mlog(ML_ERROR, "could not find local lock "
1756 "with cookie %u:%llu!\n",
1757 dlm_get_lock_cookie_node(be64_to_cpu(c)),
1758 dlm_get_lock_cookie_seq(be64_to_cpu(c)));
1759 __dlm_print_one_lock_resource(res);
1760 BUG();
1761 }
1762 BUG_ON(lock->ml.node != ml->node);
1763
1764 if (tmpq != queue) {
1765 mlog(0, "lock was on %u instead of %u for %.*s\n",
1766 j, ml->list, res->lockname.len, res->lockname.name);
1767 spin_unlock(&res->spinlock);
1768 continue;
1769 }
1770
1771 /* see NOTE above about why we do not update
1772 * to match the master here */
1773
1774 /* move the lock to its proper place */
1775 /* do not alter lock refcount. switching lists. */
1776 list_move_tail(&lock->list, queue);
1777 spin_unlock(&res->spinlock);
1778 added++;
1779
1780 mlog(0, "just reordered a local lock!\n");
1781 continue;
1782 }
1783
1784 /* lock is for another node. */
1785 newlock = dlm_new_lock(ml->type, ml->node,
1786 be64_to_cpu(ml->cookie), NULL);
1787 if (!newlock) {
1788 ret = -ENOMEM;
1789 goto leave;
1790 }
1791 lksb = newlock->lksb;
1792 dlm_lock_attach_lockres(newlock, res);
1793
1794 if (ml->convert_type != LKM_IVMODE) {
1795 BUG_ON(queue != &res->converting);
1796 newlock->ml.convert_type = ml->convert_type;
1797 }
1798 lksb->flags |= (ml->flags &
1799 (DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB));
1800
1801 if (ml->type == LKM_NLMODE)
1802 goto skip_lvb;
1803
1804 if (!dlm_lvb_is_empty(mres->lvb)) {
1805 if (lksb->flags & DLM_LKSB_PUT_LVB) {
1806 /* other node was trying to update
1807 * lvb when node died. recreate the
1808 * lksb with the updated lvb. */
1809 memcpy(lksb->lvb, mres->lvb, DLM_LVB_LEN);
1810 /* the lock resource lvb update must happen
1811 * NOW, before the spinlock is dropped.
1812 * we no longer wait for the AST to update
1813 * the lvb. */
1814 memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
1815 } else {
1816 /* otherwise, the node is sending its
1817 * most recent valid lvb info */
1818 BUG_ON(ml->type != LKM_EXMODE &&
1819 ml->type != LKM_PRMODE);
1820 if (!dlm_lvb_is_empty(res->lvb) &&
1821 (ml->type == LKM_EXMODE ||
1822 memcmp(res->lvb, mres->lvb, DLM_LVB_LEN))) {
1823 int i;
1824 mlog(ML_ERROR, "%s:%.*s: received bad "
1825 "lvb! type=%d\n", dlm->name,
1826 res->lockname.len,
1827 res->lockname.name, ml->type);
1828 printk("lockres lvb=[");
1829 for (i=0; i<DLM_LVB_LEN; i++)
1830 printk("%02x", res->lvb[i]);
1831 printk("]\nmigrated lvb=[");
1832 for (i=0; i<DLM_LVB_LEN; i++)
1833 printk("%02x", mres->lvb[i]);
1834 printk("]\n");
1835 dlm_print_one_lock_resource(res);
1836 BUG();
1837 }
1838 memcpy(res->lvb, mres->lvb, DLM_LVB_LEN);
1839 }
1840 }
1841 skip_lvb:
1842
1843 /* NOTE:
1844 * wrt lock queue ordering and recovery:
1845 * 1. order of locks on granted queue is
1846 * meaningless.
1847 * 2. order of locks on converting queue is
1848 * LOST with the node death. sorry charlie.
1849 * 3. order of locks on the blocked queue is
1850 * also LOST.
1851 * order of locks does not affect integrity, it
1852 * just means that a lock request may get pushed
1853 * back in line as a result of the node death.
1854 * also note that for a given node the lock order
1855 * for its secondary queue locks is preserved
1856 * relative to each other, but clearly *not*
1857 * preserved relative to locks from other nodes.
1858 */
1859 bad = 0;
1860 spin_lock(&res->spinlock);
1861 list_for_each_entry(lock, queue, list) {
1862 if (lock->ml.cookie == ml->cookie) {
1863 __be64 c = lock->ml.cookie;
1864 mlog(ML_ERROR, "%s:%.*s: %u:%llu: lock already "
1865 "exists on this lockres!\n", dlm->name,
1866 res->lockname.len, res->lockname.name,
1867 dlm_get_lock_cookie_node(be64_to_cpu(c)),
1868 dlm_get_lock_cookie_seq(be64_to_cpu(c)));
1869
1870 mlog(ML_NOTICE, "sent lock: type=%d, conv=%d, "
1871 "node=%u, cookie=%u:%llu, queue=%d\n",
1872 ml->type, ml->convert_type, ml->node,
1873 dlm_get_lock_cookie_node(be64_to_cpu(ml->cookie)),
1874 dlm_get_lock_cookie_seq(be64_to_cpu(ml->cookie)),
1875 ml->list);
1876
1877 __dlm_print_one_lock_resource(res);
1878 bad = 1;
1879 break;
1880 }
1881 }
1882 if (!bad) {
1883 dlm_lock_get(newlock);
1884 list_add_tail(&newlock->list, queue);
1885 mlog(0, "%s:%.*s: added lock for node %u, "
1886 "setting refmap bit\n", dlm->name,
1887 res->lockname.len, res->lockname.name, ml->node);
1888 dlm_lockres_set_refmap_bit(ml->node, res);
1889 added++;
1890 }
1891 spin_unlock(&res->spinlock);
1892 }
1893 mlog(0, "done running all the locks\n");
1894
1895 leave:
1896 /* balance the ref taken when the work was queued */
1897 spin_lock(&res->spinlock);
1898 dlm_lockres_drop_inflight_ref(dlm, res);
1899 spin_unlock(&res->spinlock);
1900
1901 if (ret < 0) {
1902 mlog_errno(ret);
1903 if (newlock)
1904 dlm_lock_put(newlock);
1905 }
1906
1907 mlog_exit(ret);
1908 return ret;
1909 }
1910
1911 void dlm_move_lockres_to_recovery_list(struct dlm_ctxt *dlm,
1912 struct dlm_lock_resource *res)
1913 {
1914 int i;
1915 struct list_head *queue;
1916 struct dlm_lock *lock, *next;
1917
1918 res->state |= DLM_LOCK_RES_RECOVERING;
1919 if (!list_empty(&res->recovering)) {
1920 mlog(0,
1921 "Recovering res %s:%.*s, is already on recovery list!\n",
1922 dlm->name, res->lockname.len, res->lockname.name);
1923 list_del_init(&res->recovering);
1924 }
1925 /* We need to hold a reference while on the recovery list */
1926 dlm_lockres_get(res);
1927 list_add_tail(&res->recovering, &dlm->reco.resources);
1928
1929 /* find any pending locks and put them back on proper list */
1930 for (i=DLM_BLOCKED_LIST; i>=DLM_GRANTED_LIST; i--) {
1931 queue = dlm_list_idx_to_ptr(res, i);
1932 list_for_each_entry_safe(lock, next, queue, list) {
1933 dlm_lock_get(lock);
1934 if (lock->convert_pending) {
1935 /* move converting lock back to granted */
1936 BUG_ON(i != DLM_CONVERTING_LIST);
1937 mlog(0, "node died with convert pending "
1938 "on %.*s. move back to granted list.\n",
1939 res->lockname.len, res->lockname.name);
1940 dlm_revert_pending_convert(res, lock);
1941 lock->convert_pending = 0;
1942 } else if (lock->lock_pending) {
1943 /* remove pending lock requests completely */
1944 BUG_ON(i != DLM_BLOCKED_LIST);
1945 mlog(0, "node died with lock pending "
1946 "on %.*s. remove from blocked list and skip.\n",
1947 res->lockname.len, res->lockname.name);
1948 /* lock will be floating until ref in
1949 * dlmlock_remote is freed after the network
1950 * call returns. ok for it to not be on any
1951 * list since no ast can be called
1952 * (the master is dead). */
1953 dlm_revert_pending_lock(res, lock);
1954 lock->lock_pending = 0;
1955 } else if (lock->unlock_pending) {
1956 /* if an unlock was in progress, treat as
1957 * if this had completed successfully
1958 * before sending this lock state to the
1959 * new master. note that the dlm_unlock
1960 * call is still responsible for calling
1961 * the unlockast. that will happen after
1962 * the network call times out. for now,
1963 * just move lists to prepare the new
1964 * recovery master. */
1965 BUG_ON(i != DLM_GRANTED_LIST);
1966 mlog(0, "node died with unlock pending "
1967 "on %.*s. remove from blocked list and skip.\n",
1968 res->lockname.len, res->lockname.name);
1969 dlm_commit_pending_unlock(res, lock);
1970 lock->unlock_pending = 0;
1971 } else if (lock->cancel_pending) {
1972 /* if a cancel was in progress, treat as
1973 * if this had completed successfully
1974 * before sending this lock state to the
1975 * new master */
1976 BUG_ON(i != DLM_CONVERTING_LIST);
1977 mlog(0, "node died with cancel pending "
1978 "on %.*s. move back to granted list.\n",
1979 res->lockname.len, res->lockname.name);
1980 dlm_commit_pending_cancel(res, lock);
1981 lock->cancel_pending = 0;
1982 }
1983 dlm_lock_put(lock);
1984 }
1985 }
1986 }
1987
1988
1989
1990 /* removes all recovered locks from the recovery list.
1991 * sets the res->owner to the new master.
1992 * unsets the RECOVERY flag and wakes waiters. */
1993 static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
1994 u8 dead_node, u8 new_master)
1995 {
1996 int i;
1997 struct hlist_node *hash_iter;
1998 struct hlist_head *bucket;
1999 struct dlm_lock_resource *res, *next;
2000
2001 mlog_entry_void();
2002
2003 assert_spin_locked(&dlm->spinlock);
2004
2005 list_for_each_entry_safe(res, next, &dlm->reco.resources, recovering) {
2006 if (res->owner == dead_node) {
2007 list_del_init(&res->recovering);
2008 spin_lock(&res->spinlock);
2009 /* new_master has our reference from
2010 * the lock state sent during recovery */
2011 dlm_change_lockres_owner(dlm, res, new_master);
2012 res->state &= ~DLM_LOCK_RES_RECOVERING;
2013 if (__dlm_lockres_has_locks(res))
2014 __dlm_dirty_lockres(dlm, res);
2015 spin_unlock(&res->spinlock);
2016 wake_up(&res->wq);
2017 dlm_lockres_put(res);
2018 }
2019 }
2020
2021 /* this will become unnecessary eventually, but
2022 * for now we need to run the whole hash, clear
2023 * the RECOVERING state and set the owner
2024 * if necessary */
2025 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
2026 bucket = dlm_lockres_hash(dlm, i);
2027 hlist_for_each_entry(res, hash_iter, bucket, hash_node) {
2028 if (res->state & DLM_LOCK_RES_RECOVERING) {
2029 if (res->owner == dead_node) {
2030 mlog(0, "(this=%u) res %.*s owner=%u "
2031 "was not on recovering list, but "
2032 "clearing state anyway\n",
2033 dlm->node_num, res->lockname.len,
2034 res->lockname.name, new_master);
2035 } else if (res->owner == dlm->node_num) {
2036 mlog(0, "(this=%u) res %.*s owner=%u "
2037 "was not on recovering list, "
2038 "owner is THIS node, clearing\n",
2039 dlm->node_num, res->lockname.len,
2040 res->lockname.name, new_master);
2041 } else
2042 continue;
2043
2044 if (!list_empty(&res->recovering)) {
2045 mlog(0, "%s:%.*s: lockres was "
2046 "marked RECOVERING, owner=%u\n",
2047 dlm->name, res->lockname.len,
2048 res->lockname.name, res->owner);
2049 list_del_init(&res->recovering);
2050 dlm_lockres_put(res);
2051 }
2052 spin_lock(&res->spinlock);
2053 /* new_master has our reference from
2054 * the lock state sent during recovery */
2055 dlm_change_lockres_owner(dlm, res, new_master);
2056 res->state &= ~DLM_LOCK_RES_RECOVERING;
2057 if (__dlm_lockres_has_locks(res))
2058 __dlm_dirty_lockres(dlm, res);
2059 spin_unlock(&res->spinlock);
2060 wake_up(&res->wq);
2061 }
2062 }
2063 }
2064 }
2065
2066 static inline int dlm_lvb_needs_invalidation(struct dlm_lock *lock, int local)
2067 {
2068 if (local) {
2069 if (lock->ml.type != LKM_EXMODE &&
2070 lock->ml.type != LKM_PRMODE)
2071 return 1;
2072 } else if (lock->ml.type == LKM_EXMODE)
2073 return 1;
2074 return 0;
2075 }
2076
2077 static void dlm_revalidate_lvb(struct dlm_ctxt *dlm,
2078 struct dlm_lock_resource *res, u8 dead_node)
2079 {
2080 struct list_head *queue;
2081 struct dlm_lock *lock;
2082 int blank_lvb = 0, local = 0;
2083 int i;
2084 u8 search_node;
2085
2086 assert_spin_locked(&dlm->spinlock);
2087 assert_spin_locked(&res->spinlock);
2088
2089 if (res->owner == dlm->node_num)
2090 /* if this node owned the lockres, and if the dead node
2091 * had an EX when he died, blank out the lvb */
2092 search_node = dead_node;
2093 else {
2094 /* if this is a secondary lockres, and we had no EX or PR
2095 * locks granted, we can no longer trust the lvb */
2096 search_node = dlm->node_num;
2097 local = 1; /* check local state for valid lvb */
2098 }
2099
2100 for (i=DLM_GRANTED_LIST; i<=DLM_CONVERTING_LIST; i++) {
2101 queue = dlm_list_idx_to_ptr(res, i);
2102 list_for_each_entry(lock, queue, list) {
2103 if (lock->ml.node == search_node) {
2104 if (dlm_lvb_needs_invalidation(lock, local)) {
2105 /* zero the lksb lvb and lockres lvb */
2106 blank_lvb = 1;
2107 memset(lock->lksb->lvb, 0, DLM_LVB_LEN);
2108 }
2109 }
2110 }
2111 }
2112
2113 if (blank_lvb) {
2114 mlog(0, "clearing %.*s lvb, dead node %u had EX\n",
2115 res->lockname.len, res->lockname.name, dead_node);
2116 memset(res->lvb, 0, DLM_LVB_LEN);
2117 }
2118 }
2119
2120 static void dlm_free_dead_locks(struct dlm_ctxt *dlm,
2121 struct dlm_lock_resource *res, u8 dead_node)
2122 {
2123 struct dlm_lock *lock, *next;
2124 unsigned int freed = 0;
2125
2126 /* this node is the lockres master:
2127 * 1) remove any stale locks for the dead node
2128 * 2) if the dead node had an EX when he died, blank out the lvb
2129 */
2130 assert_spin_locked(&dlm->spinlock);
2131 assert_spin_locked(&res->spinlock);
2132
2133 /* TODO: check pending_asts, pending_basts here */
2134 list_for_each_entry_safe(lock, next, &res->granted, list) {
2135 if (lock->ml.node == dead_node) {
2136 list_del_init(&lock->list);
2137 dlm_lock_put(lock);
2138 freed++;
2139 }
2140 }
2141 list_for_each_entry_safe(lock, next, &res->converting, list) {
2142 if (lock->ml.node == dead_node) {
2143 list_del_init(&lock->list);
2144 dlm_lock_put(lock);
2145 freed++;
2146 }
2147 }
2148 list_for_each_entry_safe(lock, next, &res->blocked, list) {
2149 if (lock->ml.node == dead_node) {
2150 list_del_init(&lock->list);
2151 dlm_lock_put(lock);
2152 freed++;
2153 }
2154 }
2155
2156 if (freed) {
2157 mlog(0, "%s:%.*s: freed %u locks for dead node %u, "
2158 "dropping ref from lockres\n", dlm->name,
2159 res->lockname.len, res->lockname.name, freed, dead_node);
2160 BUG_ON(!test_bit(dead_node, res->refmap));
2161 dlm_lockres_clear_refmap_bit(dead_node, res);
2162 } else if (test_bit(dead_node, res->refmap)) {
2163 mlog(0, "%s:%.*s: dead node %u had a ref, but had "
2164 "no locks and had not purged before dying\n", dlm->name,
2165 res->lockname.len, res->lockname.name, dead_node);
2166 dlm_lockres_clear_refmap_bit(dead_node, res);
2167 }
2168
2169 /* do not kick thread yet */
2170 __dlm_dirty_lockres(dlm, res);
2171 }
2172
2173 /* if this node is the recovery master, and there are no
2174 * locks for a given lockres owned by this node that are in
2175 * either PR or EX mode, zero out the lvb before requesting.
2176 *
2177 */
2178
2179
2180 static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
2181 {
2182 struct hlist_node *iter;
2183 struct dlm_lock_resource *res;
2184 int i;
2185 struct hlist_head *bucket;
2186 struct dlm_lock *lock;
2187
2188
2189 /* purge any stale mles */
2190 dlm_clean_master_list(dlm, dead_node);
2191
2192 /*
2193 * now clean up all lock resources. there are two rules:
2194 *
2195 * 1) if the dead node was the master, move the lockres
2196 * to the recovering list. set the RECOVERING flag.
2197 * this lockres needs to be cleaned up before it can
2198 * be used further.
2199 *
2200 * 2) if this node was the master, remove all locks from
2201 * each of the lockres queues that were owned by the
2202 * dead node. once recovery finishes, the dlm thread
2203 * can be kicked again to see if any ASTs or BASTs
2204 * need to be fired as a result.
2205 */
2206 for (i = 0; i < DLM_HASH_BUCKETS; i++) {
2207 bucket = dlm_lockres_hash(dlm, i);
2208 hlist_for_each_entry(res, iter, bucket, hash_node) {
2209 /* always prune any $RECOVERY entries for dead nodes,
2210 * otherwise hangs can occur during later recovery */
2211 if (dlm_is_recovery_lock(res->lockname.name,
2212 res->lockname.len)) {
2213 spin_lock(&res->spinlock);
2214 list_for_each_entry(lock, &res->granted, list) {
2215 if (lock->ml.node == dead_node) {
2216 mlog(0, "AHA! there was "
2217 "a $RECOVERY lock for dead "
2218 "node %u (%s)!\n",
2219 dead_node, dlm->name);
2220 list_del_init(&lock->list);
2221 dlm_lock_put(lock);
2222 break;
2223 }
2224 }
2225 spin_unlock(&res->spinlock);
2226 continue;
2227 }
2228 spin_lock(&res->spinlock);
2229 /* zero the lvb if necessary */
2230 dlm_revalidate_lvb(dlm, res, dead_node);
2231 if (res->owner == dead_node) {
2232 if (res->state & DLM_LOCK_RES_DROPPING_REF)
2233 mlog(0, "%s:%.*s: owned by "
2234 "dead node %u, this node was "
2235 "dropping its ref when it died. "
2236 "continue, dropping the flag.\n",
2237 dlm->name, res->lockname.len,
2238 res->lockname.name, dead_node);
2239
2240 /* the wake_up for this will happen when the
2241 * RECOVERING flag is dropped later */
2242 res->state &= ~DLM_LOCK_RES_DROPPING_REF;
2243
2244 dlm_move_lockres_to_recovery_list(dlm, res);
2245 } else if (res->owner == dlm->node_num) {
2246 dlm_free_dead_locks(dlm, res, dead_node);
2247 __dlm_lockres_calc_usage(dlm, res);
2248 }
2249 spin_unlock(&res->spinlock);
2250 }
2251 }
2252
2253 }
2254
2255 static void __dlm_hb_node_down(struct dlm_ctxt *dlm, int idx)
2256 {
2257 assert_spin_locked(&dlm->spinlock);
2258
2259 if (dlm->reco.new_master == idx) {
2260 mlog(0, "%s: recovery master %d just died\n",
2261 dlm->name, idx);
2262 if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
2263 /* finalize1 was reached, so it is safe to clear
2264 * the new_master and dead_node. that recovery
2265 * is complete. */
2266 mlog(0, "%s: dead master %d had reached "
2267 "finalize1 state, clearing\n", dlm->name, idx);
2268 dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
2269 __dlm_reset_recovery(dlm);
2270 }
2271 }
2272
2273 /* check to see if the node is already considered dead */
2274 if (!test_bit(idx, dlm->live_nodes_map)) {
2275 mlog(0, "for domain %s, node %d is already dead. "
2276 "another node likely did recovery already.\n",
2277 dlm->name, idx);
2278 return;
2279 }
2280
2281 /* check to see if we do not care about this node */
2282 if (!test_bit(idx, dlm->domain_map)) {
2283 /* This also catches the case that we get a node down
2284 * but haven't joined the domain yet. */
2285 mlog(0, "node %u already removed from domain!\n", idx);
2286 return;
2287 }
2288
2289 clear_bit(idx, dlm->live_nodes_map);
2290
2291 /* Clean up join state on node death. */
2292 if (dlm->joining_node == idx) {
2293 mlog(0, "Clearing join state for node %u\n", idx);
2294 __dlm_set_joining_node(dlm, DLM_LOCK_RES_OWNER_UNKNOWN);
2295 }
2296
2297 /* make sure local cleanup occurs before the heartbeat events */
2298 if (!test_bit(idx, dlm->recovery_map))
2299 dlm_do_local_recovery_cleanup(dlm, idx);
2300
2301 /* notify anything attached to the heartbeat events */
2302 dlm_hb_event_notify_attached(dlm, idx, 0);
2303
2304 mlog(0, "node %u being removed from domain map!\n", idx);
2305 clear_bit(idx, dlm->domain_map);
2306 /* wake up migration waiters if a node goes down.
2307 * perhaps later we can genericize this for other waiters. */
2308 wake_up(&dlm->migration_wq);
2309
2310 if (test_bit(idx, dlm->recovery_map))
2311 mlog(0, "domain %s, node %u already added "
2312 "to recovery map!\n", dlm->name, idx);
2313 else
2314 set_bit(idx, dlm->recovery_map);
2315 }
2316
2317 void dlm_hb_node_down_cb(struct o2nm_node *node, int idx, void *data)
2318 {
2319 struct dlm_ctxt *dlm = data;
2320
2321 if (!dlm_grab(dlm))
2322 return;
2323
2324 spin_lock(&dlm->spinlock);
2325 __dlm_hb_node_down(dlm, idx);
2326 spin_unlock(&dlm->spinlock);
2327
2328 dlm_put(dlm);
2329 }
2330
2331 void dlm_hb_node_up_cb(struct o2nm_node *node, int idx, void *data)
2332 {
2333 struct dlm_ctxt *dlm = data;
2334
2335 if (!dlm_grab(dlm))
2336 return;
2337
2338 spin_lock(&dlm->spinlock);
2339 set_bit(idx, dlm->live_nodes_map);
2340 /* do NOT notify mle attached to the heartbeat events.
2341 * new nodes are not interesting in mastery until joined. */
2342 spin_unlock(&dlm->spinlock);
2343
2344 dlm_put(dlm);
2345 }
2346
2347 static void dlm_reco_ast(void *astdata)
2348 {
2349 struct dlm_ctxt *dlm = astdata;
2350 mlog(0, "ast for recovery lock fired!, this=%u, dlm=%s\n",
2351 dlm->node_num, dlm->name);
2352 }
2353 static void dlm_reco_bast(void *astdata, int blocked_type)
2354 {
2355 struct dlm_ctxt *dlm = astdata;
2356 mlog(0, "bast for recovery lock fired!, this=%u, dlm=%s\n",
2357 dlm->node_num, dlm->name);
2358 }
2359 static void dlm_reco_unlock_ast(void *astdata, enum dlm_status st)
2360 {
2361 mlog(0, "unlockast for recovery lock fired!\n");
2362 }
2363
2364 /*
2365 * dlm_pick_recovery_master will continually attempt to use
2366 * dlmlock() on the special "$RECOVERY" lockres with the
2367 * LKM_NOQUEUE flag to get an EX. every thread that enters
2368 * this function on each node racing to become the recovery
2369 * master will not stop attempting this until either:
2370 * a) this node gets the EX (and becomes the recovery master),
2371 * or b) dlm->reco.new_master gets set to some nodenum
2372 * != O2NM_INVALID_NODE_NUM (another node will do the reco).
2373 * so each time a recovery master is needed, the entire cluster
2374 * will sync at this point. if the new master dies, that will
2375 * be detected in dlm_do_recovery */
2376 static int dlm_pick_recovery_master(struct dlm_ctxt *dlm)
2377 {
2378 enum dlm_status ret;
2379 struct dlm_lockstatus lksb;
2380 int status = -EINVAL;
2381
2382 mlog(0, "starting recovery of %s at %lu, dead=%u, this=%u\n",
2383 dlm->name, jiffies, dlm->reco.dead_node, dlm->node_num);
2384 again:
2385 memset(&lksb, 0, sizeof(lksb));
2386
2387 ret = dlmlock(dlm, LKM_EXMODE, &lksb, LKM_NOQUEUE|LKM_RECOVERY,
2388 DLM_RECOVERY_LOCK_NAME, DLM_RECOVERY_LOCK_NAME_LEN,
2389 dlm_reco_ast, dlm, dlm_reco_bast);
2390
2391 mlog(0, "%s: dlmlock($RECOVERY) returned %d, lksb=%d\n",
2392 dlm->name, ret, lksb.status);
2393
2394 if (ret == DLM_NORMAL) {
2395 mlog(0, "dlm=%s dlmlock says I got it (this=%u)\n",
2396 dlm->name, dlm->node_num);
2397
2398 /* got the EX lock. check to see if another node
2399 * just became the reco master */
2400 if (dlm_reco_master_ready(dlm)) {
2401 mlog(0, "%s: got reco EX lock, but %u will "
2402 "do the recovery\n", dlm->name,
2403 dlm->reco.new_master);
2404 status = -EEXIST;
2405 } else {
2406 status = 0;
2407
2408 /* see if recovery was already finished elsewhere */
2409 spin_lock(&dlm->spinlock);
2410 if (dlm->reco.dead_node == O2NM_INVALID_NODE_NUM) {
2411 status = -EINVAL;
2412 mlog(0, "%s: got reco EX lock, but "
2413 "node got recovered already\n", dlm->name);
2414 if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
2415 mlog(ML_ERROR, "%s: new master is %u "
2416 "but no dead node!\n",
2417 dlm->name, dlm->reco.new_master);
2418 BUG();
2419 }
2420 }
2421 spin_unlock(&dlm->spinlock);
2422 }
2423
2424 /* if this node has actually become the recovery master,
2425 * set the master and send the messages to begin recovery */
2426 if (!status) {
2427 mlog(0, "%s: dead=%u, this=%u, sending "
2428 "begin_reco now\n", dlm->name,
2429 dlm->reco.dead_node, dlm->node_num);
2430 status = dlm_send_begin_reco_message(dlm,
2431 dlm->reco.dead_node);
2432 /* this always succeeds */
2433 BUG_ON(status);
2434
2435 /* set the new_master to this node */
2436 spin_lock(&dlm->spinlock);
2437 dlm_set_reco_master(dlm, dlm->node_num);
2438 spin_unlock(&dlm->spinlock);
2439 }
2440
2441 /* recovery lock is a special case. ast will not get fired,
2442 * so just go ahead and unlock it. */
2443 ret = dlmunlock(dlm, &lksb, 0, dlm_reco_unlock_ast, dlm);
2444 if (ret == DLM_DENIED) {
2445 mlog(0, "got DLM_DENIED, trying LKM_CANCEL\n");
2446 ret = dlmunlock(dlm, &lksb, LKM_CANCEL, dlm_reco_unlock_ast, dlm);
2447 }
2448 if (ret != DLM_NORMAL) {
2449 /* this would really suck. this could only happen
2450 * if there was a network error during the unlock
2451 * because of node death. this means the unlock
2452 * is actually "done" and the lock structure is
2453 * even freed. we can continue, but only
2454 * because this specific lock name is special. */
2455 mlog(ML_ERROR, "dlmunlock returned %d\n", ret);
2456 }
2457 } else if (ret == DLM_NOTQUEUED) {
2458 mlog(0, "dlm=%s dlmlock says another node got it (this=%u)\n",
2459 dlm->name, dlm->node_num);
2460 /* another node is master. wait on
2461 * reco.new_master != O2NM_INVALID_NODE_NUM
2462 * for at most one second */
2463 wait_event_timeout(dlm->dlm_reco_thread_wq,
2464 dlm_reco_master_ready(dlm),
2465 msecs_to_jiffies(1000));
2466 if (!dlm_reco_master_ready(dlm)) {
2467 mlog(0, "%s: reco master taking awhile\n",
2468 dlm->name);
2469 goto again;
2470 }
2471 /* another node has informed this one that it is reco master */
2472 mlog(0, "%s: reco master %u is ready to recover %u\n",
2473 dlm->name, dlm->reco.new_master, dlm->reco.dead_node);
2474 status = -EEXIST;
2475 } else if (ret == DLM_RECOVERING) {
2476 mlog(0, "dlm=%s dlmlock says master node died (this=%u)\n",
2477 dlm->name, dlm->node_num);
2478 goto again;
2479 } else {
2480 struct dlm_lock_resource *res;
2481
2482 /* dlmlock returned something other than NOTQUEUED or NORMAL */
2483 mlog(ML_ERROR, "%s: got %s from dlmlock($RECOVERY), "
2484 "lksb.status=%s\n", dlm->name, dlm_errname(ret),
2485 dlm_errname(lksb.status));
2486 res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
2487 DLM_RECOVERY_LOCK_NAME_LEN);
2488 if (res) {
2489 dlm_print_one_lock_resource(res);
2490 dlm_lockres_put(res);
2491 } else {
2492 mlog(ML_ERROR, "recovery lock not found\n");
2493 }
2494 BUG();
2495 }
2496
2497 return status;
2498 }
2499
2500 static int dlm_send_begin_reco_message(struct dlm_ctxt *dlm, u8 dead_node)
2501 {
2502 struct dlm_begin_reco br;
2503 int ret = 0;
2504 struct dlm_node_iter iter;
2505 int nodenum;
2506 int status;
2507
2508 mlog_entry("%u\n", dead_node);
2509
2510 mlog(0, "%s: dead node is %u\n", dlm->name, dead_node);
2511
2512 spin_lock(&dlm->spinlock);
2513 dlm_node_iter_init(dlm->domain_map, &iter);
2514 spin_unlock(&dlm->spinlock);
2515
2516 clear_bit(dead_node, iter.node_map);
2517
2518 memset(&br, 0, sizeof(br));
2519 br.node_idx = dlm->node_num;
2520 br.dead_node = dead_node;
2521
2522 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
2523 ret = 0;
2524 if (nodenum == dead_node) {
2525 mlog(0, "not sending begin reco to dead node "
2526 "%u\n", dead_node);
2527 continue;
2528 }
2529 if (nodenum == dlm->node_num) {
2530 mlog(0, "not sending begin reco to self\n");
2531 continue;
2532 }
2533 retry:
2534 ret = -EINVAL;
2535 mlog(0, "attempting to send begin reco msg to %d\n",
2536 nodenum);
2537 ret = o2net_send_message(DLM_BEGIN_RECO_MSG, dlm->key,
2538 &br, sizeof(br), nodenum, &status);
2539 /* negative status is handled ok by caller here */
2540 if (ret >= 0)
2541 ret = status;
2542 if (dlm_is_host_down(ret)) {
2543 /* node is down. not involved in recovery
2544 * so just keep going */
2545 mlog(0, "%s: node %u was down when sending "
2546 "begin reco msg (%d)\n", dlm->name, nodenum, ret);
2547 ret = 0;
2548 }
2549 if (ret < 0) {
2550 struct dlm_lock_resource *res;
2551 /* this is now a serious problem, possibly ENOMEM
2552 * in the network stack. must retry */
2553 mlog_errno(ret);
2554 mlog(ML_ERROR, "begin reco of dlm %s to node %u "
2555 " returned %d\n", dlm->name, nodenum, ret);
2556 res = dlm_lookup_lockres(dlm, DLM_RECOVERY_LOCK_NAME,
2557 DLM_RECOVERY_LOCK_NAME_LEN);
2558 if (res) {
2559 dlm_print_one_lock_resource(res);
2560 dlm_lockres_put(res);
2561 } else {
2562 mlog(ML_ERROR, "recovery lock not found\n");
2563 }
2564 /* sleep for a bit in hopes that we can avoid
2565 * another ENOMEM */
2566 msleep(100);
2567 goto retry;
2568 } else if (ret == EAGAIN) {
2569 mlog(0, "%s: trying to start recovery of node "
2570 "%u, but node %u is waiting for last recovery "
2571 "to complete, backoff for a bit\n", dlm->name,
2572 dead_node, nodenum);
2573 /* TODO Look into replacing msleep with cond_resched() */
2574 msleep(100);
2575 goto retry;
2576 }
2577 }
2578
2579 return ret;
2580 }
2581
2582 int dlm_begin_reco_handler(struct o2net_msg *msg, u32 len, void *data,
2583 void **ret_data)
2584 {
2585 struct dlm_ctxt *dlm = data;
2586 struct dlm_begin_reco *br = (struct dlm_begin_reco *)msg->buf;
2587
2588 /* ok to return 0, domain has gone away */
2589 if (!dlm_grab(dlm))
2590 return 0;
2591
2592 spin_lock(&dlm->spinlock);
2593 if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
2594 mlog(0, "%s: node %u wants to recover node %u (%u:%u) "
2595 "but this node is in finalize state, waiting on finalize2\n",
2596 dlm->name, br->node_idx, br->dead_node,
2597 dlm->reco.dead_node, dlm->reco.new_master);
2598 spin_unlock(&dlm->spinlock);
2599 return EAGAIN;
2600 }
2601 spin_unlock(&dlm->spinlock);
2602
2603 mlog(0, "%s: node %u wants to recover node %u (%u:%u)\n",
2604 dlm->name, br->node_idx, br->dead_node,
2605 dlm->reco.dead_node, dlm->reco.new_master);
2606
2607 dlm_fire_domain_eviction_callbacks(dlm, br->dead_node);
2608
2609 spin_lock(&dlm->spinlock);
2610 if (dlm->reco.new_master != O2NM_INVALID_NODE_NUM) {
2611 if (test_bit(dlm->reco.new_master, dlm->recovery_map)) {
2612 mlog(0, "%s: new_master %u died, changing "
2613 "to %u\n", dlm->name, dlm->reco.new_master,
2614 br->node_idx);
2615 } else {
2616 mlog(0, "%s: new_master %u NOT DEAD, changing "
2617 "to %u\n", dlm->name, dlm->reco.new_master,
2618 br->node_idx);
2619 /* may not have seen the new master as dead yet */
2620 }
2621 }
2622 if (dlm->reco.dead_node != O2NM_INVALID_NODE_NUM) {
2623 mlog(ML_NOTICE, "%s: dead_node previously set to %u, "
2624 "node %u changing it to %u\n", dlm->name,
2625 dlm->reco.dead_node, br->node_idx, br->dead_node);
2626 }
2627 dlm_set_reco_master(dlm, br->node_idx);
2628 dlm_set_reco_dead_node(dlm, br->dead_node);
2629 if (!test_bit(br->dead_node, dlm->recovery_map)) {
2630 mlog(0, "recovery master %u sees %u as dead, but this "
2631 "node has not yet. marking %u as dead\n",
2632 br->node_idx, br->dead_node, br->dead_node);
2633 if (!test_bit(br->dead_node, dlm->domain_map) ||
2634 !test_bit(br->dead_node, dlm->live_nodes_map))
2635 mlog(0, "%u not in domain/live_nodes map "
2636 "so setting it in reco map manually\n",
2637 br->dead_node);
2638 /* force the recovery cleanup in __dlm_hb_node_down
2639 * both of these will be cleared in a moment */
2640 set_bit(br->dead_node, dlm->domain_map);
2641 set_bit(br->dead_node, dlm->live_nodes_map);
2642 __dlm_hb_node_down(dlm, br->dead_node);
2643 }
2644 spin_unlock(&dlm->spinlock);
2645
2646 dlm_kick_recovery_thread(dlm);
2647
2648 mlog(0, "%s: recovery started by node %u, for %u (%u:%u)\n",
2649 dlm->name, br->node_idx, br->dead_node,
2650 dlm->reco.dead_node, dlm->reco.new_master);
2651
2652 dlm_put(dlm);
2653 return 0;
2654 }
2655
2656 #define DLM_FINALIZE_STAGE2 0x01
2657 static int dlm_send_finalize_reco_message(struct dlm_ctxt *dlm)
2658 {
2659 int ret = 0;
2660 struct dlm_finalize_reco fr;
2661 struct dlm_node_iter iter;
2662 int nodenum;
2663 int status;
2664 int stage = 1;
2665
2666 mlog(0, "finishing recovery for node %s:%u, "
2667 "stage %d\n", dlm->name, dlm->reco.dead_node, stage);
2668
2669 spin_lock(&dlm->spinlock);
2670 dlm_node_iter_init(dlm->domain_map, &iter);
2671 spin_unlock(&dlm->spinlock);
2672
2673 stage2:
2674 memset(&fr, 0, sizeof(fr));
2675 fr.node_idx = dlm->node_num;
2676 fr.dead_node = dlm->reco.dead_node;
2677 if (stage == 2)
2678 fr.flags |= DLM_FINALIZE_STAGE2;
2679
2680 while ((nodenum = dlm_node_iter_next(&iter)) >= 0) {
2681 if (nodenum == dlm->node_num)
2682 continue;
2683 ret = o2net_send_message(DLM_FINALIZE_RECO_MSG, dlm->key,
2684 &fr, sizeof(fr), nodenum, &status);
2685 if (ret >= 0)
2686 ret = status;
2687 if (ret < 0) {
2688 mlog_errno(ret);
2689 if (dlm_is_host_down(ret)) {
2690 /* this has no effect on this recovery
2691 * session, so set the status to zero to
2692 * finish out the last recovery */
2693 mlog(ML_ERROR, "node %u went down after this "
2694 "node finished recovery.\n", nodenum);
2695 ret = 0;
2696 continue;
2697 }
2698 break;
2699 }
2700 }
2701 if (stage == 1) {
2702 /* reset the node_iter back to the top and send finalize2 */
2703 iter.curnode = -1;
2704 stage = 2;
2705 goto stage2;
2706 }
2707
2708 return ret;
2709 }
2710
2711 int dlm_finalize_reco_handler(struct o2net_msg *msg, u32 len, void *data,
2712 void **ret_data)
2713 {
2714 struct dlm_ctxt *dlm = data;
2715 struct dlm_finalize_reco *fr = (struct dlm_finalize_reco *)msg->buf;
2716 int stage = 1;
2717
2718 /* ok to return 0, domain has gone away */
2719 if (!dlm_grab(dlm))
2720 return 0;
2721
2722 if (fr->flags & DLM_FINALIZE_STAGE2)
2723 stage = 2;
2724
2725 mlog(0, "%s: node %u finalizing recovery stage%d of "
2726 "node %u (%u:%u)\n", dlm->name, fr->node_idx, stage,
2727 fr->dead_node, dlm->reco.dead_node, dlm->reco.new_master);
2728
2729 spin_lock(&dlm->spinlock);
2730
2731 if (dlm->reco.new_master != fr->node_idx) {
2732 mlog(ML_ERROR, "node %u sent recovery finalize msg, but node "
2733 "%u is supposed to be the new master, dead=%u\n",
2734 fr->node_idx, dlm->reco.new_master, fr->dead_node);
2735 BUG();
2736 }
2737 if (dlm->reco.dead_node != fr->dead_node) {
2738 mlog(ML_ERROR, "node %u sent recovery finalize msg for dead "
2739 "node %u, but node %u is supposed to be dead\n",
2740 fr->node_idx, fr->dead_node, dlm->reco.dead_node);
2741 BUG();
2742 }
2743
2744 switch (stage) {
2745 case 1:
2746 dlm_finish_local_lockres_recovery(dlm, fr->dead_node, fr->node_idx);
2747 if (dlm->reco.state & DLM_RECO_STATE_FINALIZE) {
2748 mlog(ML_ERROR, "%s: received finalize1 from "
2749 "new master %u for dead node %u, but "
2750 "this node has already received it!\n",
2751 dlm->name, fr->node_idx, fr->dead_node);
2752 dlm_print_reco_node_status(dlm);
2753 BUG();
2754 }
2755 dlm->reco.state |= DLM_RECO_STATE_FINALIZE;
2756 spin_unlock(&dlm->spinlock);
2757 break;
2758 case 2:
2759 if (!(dlm->reco.state & DLM_RECO_STATE_FINALIZE)) {
2760 mlog(ML_ERROR, "%s: received finalize2 from "
2761 "new master %u for dead node %u, but "
2762 "this node did not have finalize1!\n",
2763 dlm->name, fr->node_idx, fr->dead_node);
2764 dlm_print_reco_node_status(dlm);
2765 BUG();
2766 }
2767 dlm->reco.state &= ~DLM_RECO_STATE_FINALIZE;
2768 spin_unlock(&dlm->spinlock);
2769 dlm_reset_recovery(dlm);
2770 dlm_kick_recovery_thread(dlm);
2771 break;
2772 default:
2773 BUG();
2774 }
2775
2776 mlog(0, "%s: recovery done, reco master was %u, dead now %u, master now %u\n",
2777 dlm->name, fr->node_idx, dlm->reco.dead_node, dlm->reco.new_master);
2778
2779 dlm_put(dlm);
2780 return 0;
2781 }
kmemtrace - Kernel memory tracer