1 /* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * dlmunlock.c
5 *
6 * underlying calls for unlocking locks
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/highmem.h>
32 #include <linux/init.h>
33 #include <linux/sysctl.h>
34 #include <linux/random.h>
35 #include <linux/blkdev.h>
36 #include <linux/socket.h>
37 #include <linux/inet.h>
38 #include <linux/spinlock.h>
39 #include <linux/delay.h>
40
41 #include "cluster/heartbeat.h"
42 #include "cluster/nodemanager.h"
43 #include "cluster/tcp.h"
44
45 #include "dlmapi.h"
46 #include "dlmcommon.h"
47
48 #define MLOG_MASK_PREFIX ML_DLM
49 #include "cluster/masklog.h"
50
51 #define DLM_UNLOCK_FREE_LOCK 0x00000001
52 #define DLM_UNLOCK_CALL_AST 0x00000002
53 #define DLM_UNLOCK_REMOVE_LOCK 0x00000004
54 #define DLM_UNLOCK_REGRANT_LOCK 0x00000008
55 #define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010
56
57
58 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
59 struct dlm_lock_resource *res,
60 struct dlm_lock *lock,
61 struct dlm_lockstatus *lksb,
62 int *actions);
63 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
64 struct dlm_lock_resource *res,
65 struct dlm_lock *lock,
66 struct dlm_lockstatus *lksb,
67 int *actions);
68
69 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
70 struct dlm_lock_resource *res,
71 struct dlm_lock *lock,
72 struct dlm_lockstatus *lksb,
73 int flags,
74 u8 owner);
75
76
77 /*
78 * according to the spec:
79 * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf
80 *
81 * flags & LKM_CANCEL != 0: must be converting or blocked
82 * flags & LKM_CANCEL == 0: must be granted
83 *
84 * So to unlock a converting lock, you must first cancel the
85 * convert (passing LKM_CANCEL in flags), then call the unlock
86 * again (with no LKM_CANCEL in flags).
87 */
88
89
90 /*
91 * locking:
92 * caller needs: none
93 * taken: res->spinlock and lock->spinlock taken and dropped
94 * held on exit: none
95 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
96 * all callers should have taken an extra ref on lock coming in
97 */
dlmunlock_common(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,struct dlm_lockstatus * lksb,int flags,int * call_ast,int master_node)98 static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
99 struct dlm_lock_resource *res,
100 struct dlm_lock *lock,
101 struct dlm_lockstatus *lksb,
102 int flags, int *call_ast,
103 int master_node)
104 {
105 enum dlm_status status;
106 int actions = 0;
107 int in_use;
108 u8 owner;
109 int recovery_wait = 0;
110
111 mlog(0, "master_node = %d, valblk = %d\n", master_node,
112 flags & LKM_VALBLK);
113
114 if (master_node)
115 BUG_ON(res->owner != dlm->node_num);
116 else
117 BUG_ON(res->owner == dlm->node_num);
118
119 spin_lock(&dlm->ast_lock);
120 /* We want to be sure that we're not freeing a lock
121 * that still has AST's pending... */
122 in_use = !list_empty(&lock->ast_list);
123 spin_unlock(&dlm->ast_lock);
124 if (in_use && !(flags & LKM_CANCEL)) {
125 mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock "
126 "while waiting for an ast!", res->lockname.len,
127 res->lockname.name);
128 return DLM_BADPARAM;
129 }
130
131 spin_lock(&res->spinlock);
132 if (res->state & DLM_LOCK_RES_IN_PROGRESS) {
133 if (master_node && !(flags & LKM_CANCEL)) {
134 mlog(ML_ERROR, "lockres in progress!\n");
135 spin_unlock(&res->spinlock);
136 return DLM_FORWARD;
137 }
138 /* ok for this to sleep if not in a network handler */
139 __dlm_wait_on_lockres(res);
140 res->state |= DLM_LOCK_RES_IN_PROGRESS;
141 }
142 spin_lock(&lock->spinlock);
143
144 if (res->state & DLM_LOCK_RES_RECOVERING) {
145 status = DLM_RECOVERING;
146 goto leave;
147 }
148
149 if (res->state & DLM_LOCK_RES_MIGRATING) {
150 status = DLM_MIGRATING;
151 goto leave;
152 }
153
154 /* see above for what the spec says about
155 * LKM_CANCEL and the lock queue state */
156 if (flags & LKM_CANCEL)
157 status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions);
158 else
159 status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions);
160
161 if (status != DLM_NORMAL && (status != DLM_CANCELGRANT || !master_node))
162 goto leave;
163
164 /* By now this has been masked out of cancel requests. */
165 if (flags & LKM_VALBLK) {
166 /* make the final update to the lvb */
167 if (master_node)
168 memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN);
169 else
170 flags |= LKM_PUT_LVB; /* let the send function
171 * handle it. */
172 }
173
174 if (!master_node) {
175 owner = res->owner;
176 /* drop locks and send message */
177 if (flags & LKM_CANCEL)
178 lock->cancel_pending = 1;
179 else
180 lock->unlock_pending = 1;
181 spin_unlock(&lock->spinlock);
182 spin_unlock(&res->spinlock);
183 status = dlm_send_remote_unlock_request(dlm, res, lock, lksb,
184 flags, owner);
185 spin_lock(&res->spinlock);
186 spin_lock(&lock->spinlock);
187 /* if the master told us the lock was already granted,
188 * let the ast handle all of these actions */
189 if (status == DLM_CANCELGRANT) {
190 actions &= ~(DLM_UNLOCK_REMOVE_LOCK|
191 DLM_UNLOCK_REGRANT_LOCK|
192 DLM_UNLOCK_CLEAR_CONVERT_TYPE);
193 } else if (status == DLM_RECOVERING ||
194 status == DLM_MIGRATING ||
195 status == DLM_FORWARD ||
196 status == DLM_NOLOCKMGR
197 ) {
198 /* must clear the actions because this unlock
199 * is about to be retried. cannot free or do
200 * any list manipulation. */
201 mlog(0, "%s:%.*s: clearing actions, %s\n",
202 dlm->name, res->lockname.len,
203 res->lockname.name,
204 status==DLM_RECOVERING?"recovering":
205 (status==DLM_MIGRATING?"migrating":
206 (status == DLM_FORWARD ? "forward" :
207 "nolockmanager")));
208 actions = 0;
209 }
210 if (flags & LKM_CANCEL)
211 lock->cancel_pending = 0;
212 else {
213 if (!lock->unlock_pending)
214 recovery_wait = 1;
215 else
216 lock->unlock_pending = 0;
217 }
218 }
219
220 /* get an extra ref on lock. if we are just switching
221 * lists here, we dont want the lock to go away. */
222 dlm_lock_get(lock);
223
224 if (actions & DLM_UNLOCK_REMOVE_LOCK) {
225 list_del_init(&lock->list);
226 dlm_lock_put(lock);
227 }
228 if (actions & DLM_UNLOCK_REGRANT_LOCK) {
229 dlm_lock_get(lock);
230 list_add_tail(&lock->list, &res->granted);
231 }
232 if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) {
233 mlog(0, "clearing convert_type at %smaster node\n",
234 master_node ? "" : "non-");
235 lock->ml.convert_type = LKM_IVMODE;
236 }
237
238 /* remove the extra ref on lock */
239 dlm_lock_put(lock);
240
241 leave:
242 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
243 if (!dlm_lock_on_list(&res->converting, lock))
244 BUG_ON(lock->ml.convert_type != LKM_IVMODE);
245 else
246 BUG_ON(lock->ml.convert_type == LKM_IVMODE);
247 spin_unlock(&lock->spinlock);
248 spin_unlock(&res->spinlock);
249 wake_up(&res->wq);
250
251 if (recovery_wait) {
252 spin_lock(&res->spinlock);
253 /* Unlock request will directly succeed after owner dies,
254 * and the lock is already removed from grant list. We have to
255 * wait for RECOVERING done or we miss the chance to purge it
256 * since the removement is much faster than RECOVERING proc.
257 */
258 __dlm_wait_on_lockres_flags(res, DLM_LOCK_RES_RECOVERING);
259 spin_unlock(&res->spinlock);
260 }
261
262 /* let the caller's final dlm_lock_put handle the actual kfree */
263 if (actions & DLM_UNLOCK_FREE_LOCK) {
264 /* this should always be coupled with list removal */
265 BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK));
266 mlog(0, "lock %u:%llu should be gone now! refs=%d\n",
267 dlm_get_lock_cookie_node(be64_to_cpu(lock->ml.cookie)),
268 dlm_get_lock_cookie_seq(be64_to_cpu(lock->ml.cookie)),
269 kref_read(&lock->lock_refs)-1);
270 dlm_lock_put(lock);
271 }
272 if (actions & DLM_UNLOCK_CALL_AST)
273 *call_ast = 1;
274
275 /* if cancel or unlock succeeded, lvb work is done */
276 if (status == DLM_NORMAL)
277 lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB);
278
279 return status;
280 }
281
dlm_commit_pending_unlock(struct dlm_lock_resource * res,struct dlm_lock * lock)282 void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
283 struct dlm_lock *lock)
284 {
285 /* leave DLM_LKSB_PUT_LVB on the lksb so any final
286 * update of the lvb will be sent to the new master */
287 list_del_init(&lock->list);
288 }
289
dlm_commit_pending_cancel(struct dlm_lock_resource * res,struct dlm_lock * lock)290 void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
291 struct dlm_lock *lock)
292 {
293 list_move_tail(&lock->list, &res->granted);
294 lock->ml.convert_type = LKM_IVMODE;
295 }
296
297
dlmunlock_master(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,struct dlm_lockstatus * lksb,int flags,int * call_ast)298 static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm,
299 struct dlm_lock_resource *res,
300 struct dlm_lock *lock,
301 struct dlm_lockstatus *lksb,
302 int flags,
303 int *call_ast)
304 {
305 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1);
306 }
307
dlmunlock_remote(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,struct dlm_lockstatus * lksb,int flags,int * call_ast)308 static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm,
309 struct dlm_lock_resource *res,
310 struct dlm_lock *lock,
311 struct dlm_lockstatus *lksb,
312 int flags, int *call_ast)
313 {
314 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0);
315 }
316
317 /*
318 * locking:
319 * caller needs: none
320 * taken: none
321 * held on exit: none
322 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
323 */
dlm_send_remote_unlock_request(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,struct dlm_lockstatus * lksb,int flags,u8 owner)324 static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
325 struct dlm_lock_resource *res,
326 struct dlm_lock *lock,
327 struct dlm_lockstatus *lksb,
328 int flags,
329 u8 owner)
330 {
331 struct dlm_unlock_lock unlock;
332 int tmpret;
333 enum dlm_status ret;
334 int status = 0;
335 struct kvec vec[2];
336 size_t veclen = 1;
337
338 mlog(0, "%.*s\n", res->lockname.len, res->lockname.name);
339
340 if (owner == dlm->node_num) {
341 /* ended up trying to contact ourself. this means
342 * that the lockres had been remote but became local
343 * via a migration. just retry it, now as local */
344 mlog(0, "%s:%.*s: this node became the master due to a "
345 "migration, re-evaluate now\n", dlm->name,
346 res->lockname.len, res->lockname.name);
347 return DLM_FORWARD;
348 }
349
350 memset(&unlock, 0, sizeof(unlock));
351 unlock.node_idx = dlm->node_num;
352 unlock.flags = cpu_to_be32(flags);
353 unlock.cookie = lock->ml.cookie;
354 unlock.namelen = res->lockname.len;
355 memcpy(unlock.name, res->lockname.name, unlock.namelen);
356
357 vec[0].iov_len = sizeof(struct dlm_unlock_lock);
358 vec[0].iov_base = &unlock;
359
360 if (flags & LKM_PUT_LVB) {
361 /* extra data to send if we are updating lvb */
362 vec[1].iov_len = DLM_LVB_LEN;
363 vec[1].iov_base = lock->lksb->lvb;
364 veclen++;
365 }
366
367 tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key,
368 vec, veclen, owner, &status);
369 if (tmpret >= 0) {
370 // successfully sent and received
371 if (status == DLM_FORWARD)
372 mlog(0, "master was in-progress. retry\n");
373 ret = status;
374 } else {
375 mlog(ML_ERROR, "Error %d when sending message %u (key 0x%x) to "
376 "node %u\n", tmpret, DLM_UNLOCK_LOCK_MSG, dlm->key, owner);
377 if (dlm_is_host_down(tmpret)) {
378 /* NOTE: this seems strange, but it is what we want.
379 * when the master goes down during a cancel or
380 * unlock, the recovery code completes the operation
381 * as if the master had not died, then passes the
382 * updated state to the recovery master. this thread
383 * just needs to finish out the operation and call
384 * the unlockast. */
385 if (dlm_is_node_dead(dlm, owner))
386 ret = DLM_NORMAL;
387 else
388 ret = DLM_NOLOCKMGR;
389 } else {
390 /* something bad. this will BUG in ocfs2 */
391 ret = dlm_err_to_dlm_status(tmpret);
392 }
393 }
394
395 return ret;
396 }
397
398 /*
399 * locking:
400 * caller needs: none
401 * taken: takes and drops res->spinlock
402 * held on exit: none
403 * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID,
404 * return value from dlmunlock_master
405 */
dlm_unlock_lock_handler(struct o2net_msg * msg,u32 len,void * data,void ** ret_data)406 int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data,
407 void **ret_data)
408 {
409 struct dlm_ctxt *dlm = data;
410 struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf;
411 struct dlm_lock_resource *res = NULL;
412 struct dlm_lock *lock = NULL;
413 enum dlm_status status = DLM_NORMAL;
414 int found = 0, i;
415 struct dlm_lockstatus *lksb = NULL;
416 int ignore;
417 u32 flags;
418 struct list_head *queue;
419
420 flags = be32_to_cpu(unlock->flags);
421
422 if (flags & LKM_GET_LVB) {
423 mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n");
424 return DLM_BADARGS;
425 }
426
427 if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) {
428 mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL "
429 "request!\n");
430 return DLM_BADARGS;
431 }
432
433 if (unlock->namelen > DLM_LOCKID_NAME_MAX) {
434 mlog(ML_ERROR, "Invalid name length in unlock handler!\n");
435 return DLM_IVBUFLEN;
436 }
437
438 if (!dlm_grab(dlm))
439 return DLM_FORWARD;
440
441 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
442 "Domain %s not fully joined!\n", dlm->name);
443
444 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none");
445
446 res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen);
447 if (!res) {
448 /* We assume here that a no lock resource simply means
449 * it was migrated away and destroyed before the other
450 * node could detect it. */
451 mlog(0, "returning DLM_FORWARD -- res no longer exists\n");
452 status = DLM_FORWARD;
453 goto not_found;
454 }
455
456 queue=&res->granted;
457 found = 0;
458 spin_lock(&res->spinlock);
459 if (res->state & DLM_LOCK_RES_RECOVERING) {
460 spin_unlock(&res->spinlock);
461 mlog(0, "returning DLM_RECOVERING\n");
462 status = DLM_RECOVERING;
463 goto leave;
464 }
465
466 if (res->state & DLM_LOCK_RES_MIGRATING) {
467 spin_unlock(&res->spinlock);
468 mlog(0, "returning DLM_MIGRATING\n");
469 status = DLM_MIGRATING;
470 goto leave;
471 }
472
473 if (res->owner != dlm->node_num) {
474 spin_unlock(&res->spinlock);
475 mlog(0, "returning DLM_FORWARD -- not master\n");
476 status = DLM_FORWARD;
477 goto leave;
478 }
479
480 for (i=0; i<3; i++) {
481 list_for_each_entry(lock, queue, list) {
482 if (lock->ml.cookie == unlock->cookie &&
483 lock->ml.node == unlock->node_idx) {
484 dlm_lock_get(lock);
485 found = 1;
486 break;
487 }
488 }
489 if (found)
490 break;
491 /* scan granted -> converting -> blocked queues */
492 queue++;
493 }
494 spin_unlock(&res->spinlock);
495 if (!found) {
496 status = DLM_IVLOCKID;
497 goto not_found;
498 }
499
500 /* lock was found on queue */
501 lksb = lock->lksb;
502 if (flags & (LKM_VALBLK|LKM_PUT_LVB) &&
503 lock->ml.type != LKM_EXMODE)
504 flags &= ~(LKM_VALBLK|LKM_PUT_LVB);
505
506 /* unlockast only called on originating node */
507 if (flags & LKM_PUT_LVB) {
508 lksb->flags |= DLM_LKSB_PUT_LVB;
509 memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN);
510 }
511
512 /* if this is in-progress, propagate the DLM_FORWARD
513 * all the way back out */
514 status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore);
515 if (status == DLM_FORWARD)
516 mlog(0, "lockres is in progress\n");
517
518 if (flags & LKM_PUT_LVB)
519 lksb->flags &= ~DLM_LKSB_PUT_LVB;
520
521 dlm_lockres_calc_usage(dlm, res);
522 dlm_kick_thread(dlm, res);
523
524 not_found:
525 if (!found)
526 mlog(ML_ERROR, "failed to find lock to unlock! "
527 "cookie=%u:%llu\n",
528 dlm_get_lock_cookie_node(be64_to_cpu(unlock->cookie)),
529 dlm_get_lock_cookie_seq(be64_to_cpu(unlock->cookie)));
530 else
531 dlm_lock_put(lock);
532
533 leave:
534 if (res)
535 dlm_lockres_put(res);
536
537 dlm_put(dlm);
538
539 return status;
540 }
541
542
dlm_get_cancel_actions(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,struct dlm_lockstatus * lksb,int * actions)543 static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
544 struct dlm_lock_resource *res,
545 struct dlm_lock *lock,
546 struct dlm_lockstatus *lksb,
547 int *actions)
548 {
549 enum dlm_status status;
550
551 if (dlm_lock_on_list(&res->blocked, lock)) {
552 /* cancel this outright */
553 status = DLM_NORMAL;
554 *actions = (DLM_UNLOCK_CALL_AST |
555 DLM_UNLOCK_REMOVE_LOCK);
556 } else if (dlm_lock_on_list(&res->converting, lock)) {
557 /* cancel the request, put back on granted */
558 status = DLM_NORMAL;
559 *actions = (DLM_UNLOCK_CALL_AST |
560 DLM_UNLOCK_REMOVE_LOCK |
561 DLM_UNLOCK_REGRANT_LOCK |
562 DLM_UNLOCK_CLEAR_CONVERT_TYPE);
563 } else if (dlm_lock_on_list(&res->granted, lock)) {
564 /* too late, already granted. */
565 status = DLM_CANCELGRANT;
566 *actions = DLM_UNLOCK_CALL_AST;
567 } else {
568 mlog(ML_ERROR, "lock to cancel is not on any list!\n");
569 status = DLM_IVLOCKID;
570 *actions = 0;
571 }
572 return status;
573 }
574
dlm_get_unlock_actions(struct dlm_ctxt * dlm,struct dlm_lock_resource * res,struct dlm_lock * lock,struct dlm_lockstatus * lksb,int * actions)575 static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
576 struct dlm_lock_resource *res,
577 struct dlm_lock *lock,
578 struct dlm_lockstatus *lksb,
579 int *actions)
580 {
581 enum dlm_status status;
582
583 /* unlock request */
584 if (!dlm_lock_on_list(&res->granted, lock)) {
585 status = DLM_DENIED;
586 dlm_error(status);
587 *actions = 0;
588 } else {
589 /* unlock granted lock */
590 status = DLM_NORMAL;
591 *actions = (DLM_UNLOCK_FREE_LOCK |
592 DLM_UNLOCK_CALL_AST |
593 DLM_UNLOCK_REMOVE_LOCK);
594 }
595 return status;
596 }
597
598 /* there seems to be no point in doing this async
599 * since (even for the remote case) there is really
600 * no work to queue up... so just do it and fire the
601 * unlockast by hand when done... */
dlmunlock(struct dlm_ctxt * dlm,struct dlm_lockstatus * lksb,int flags,dlm_astunlockfunc_t * unlockast,void * data)602 enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb,
603 int flags, dlm_astunlockfunc_t *unlockast, void *data)
604 {
605 enum dlm_status status;
606 struct dlm_lock_resource *res;
607 struct dlm_lock *lock = NULL;
608 int call_ast, is_master;
609
610 if (!lksb) {
611 dlm_error(DLM_BADARGS);
612 return DLM_BADARGS;
613 }
614
615 if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) {
616 dlm_error(DLM_BADPARAM);
617 return DLM_BADPARAM;
618 }
619
620 if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) {
621 mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n");
622 flags &= ~LKM_VALBLK;
623 }
624
625 if (!lksb->lockid || !lksb->lockid->lockres) {
626 dlm_error(DLM_BADPARAM);
627 return DLM_BADPARAM;
628 }
629
630 lock = lksb->lockid;
631 BUG_ON(!lock);
632 dlm_lock_get(lock);
633
634 res = lock->lockres;
635 BUG_ON(!res);
636 dlm_lockres_get(res);
637 retry:
638 call_ast = 0;
639 /* need to retry up here because owner may have changed */
640 mlog(0, "lock=%p res=%p\n", lock, res);
641
642 spin_lock(&res->spinlock);
643 is_master = (res->owner == dlm->node_num);
644 if (flags & LKM_VALBLK && lock->ml.type != LKM_EXMODE)
645 flags &= ~LKM_VALBLK;
646 spin_unlock(&res->spinlock);
647
648 if (is_master) {
649 status = dlmunlock_master(dlm, res, lock, lksb, flags,
650 &call_ast);
651 mlog(0, "done calling dlmunlock_master: returned %d, "
652 "call_ast is %d\n", status, call_ast);
653 } else {
654 status = dlmunlock_remote(dlm, res, lock, lksb, flags,
655 &call_ast);
656 mlog(0, "done calling dlmunlock_remote: returned %d, "
657 "call_ast is %d\n", status, call_ast);
658 }
659
660 if (status == DLM_RECOVERING ||
661 status == DLM_MIGRATING ||
662 status == DLM_FORWARD ||
663 status == DLM_NOLOCKMGR) {
664
665 /* We want to go away for a tiny bit to allow recovery
666 * / migration to complete on this resource. I don't
667 * know of any wait queue we could sleep on as this
668 * may be happening on another node. Perhaps the
669 * proper solution is to queue up requests on the
670 * other end? */
671
672 /* do we want to yield(); ?? */
673 msleep(50);
674
675 mlog(0, "retrying unlock due to pending recovery/"
676 "migration/in-progress/reconnect\n");
677 goto retry;
678 }
679
680 if (call_ast) {
681 mlog(0, "calling unlockast(%p, %d)\n", data, status);
682 if (is_master) {
683 /* it is possible that there is one last bast
684 * pending. make sure it is flushed, then
685 * call the unlockast.
686 * not an issue if this is a mastered remotely,
687 * since this lock has been removed from the
688 * lockres queues and cannot be found. */
689 dlm_kick_thread(dlm, NULL);
690 wait_event(dlm->ast_wq,
691 dlm_lock_basts_flushed(dlm, lock));
692 }
693 (*unlockast)(data, status);
694 }
695
696 if (status == DLM_CANCELGRANT)
697 status = DLM_NORMAL;
698
699 if (status == DLM_NORMAL) {
700 mlog(0, "kicking the thread\n");
701 dlm_kick_thread(dlm, res);
702 } else
703 dlm_error(status);
704
705 dlm_lockres_calc_usage(dlm, res);
706 dlm_lockres_put(res);
707 dlm_lock_put(lock);
708
709 mlog(0, "returning status=%d!\n", status);
710 return status;
711 }
712 EXPORT_SYMBOL_GPL(dlmunlock);
713
714