blob: c95f08d2e925493fba9ab0a690769cfdda8243e3 [file] [log] [blame]
Kurt Hackel6714d8e2005-12-15 14:31:23 -08001/* -*- 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/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/spinlock.h>
41#include <linux/delay.h>
42
43#include "cluster/heartbeat.h"
44#include "cluster/nodemanager.h"
45#include "cluster/tcp.h"
46
47#include "dlmapi.h"
48#include "dlmcommon.h"
49
50#define MLOG_MASK_PREFIX ML_DLM
51#include "cluster/masklog.h"
52
53#define DLM_UNLOCK_FREE_LOCK 0x00000001
54#define DLM_UNLOCK_CALL_AST 0x00000002
55#define DLM_UNLOCK_REMOVE_LOCK 0x00000004
56#define DLM_UNLOCK_REGRANT_LOCK 0x00000008
57#define DLM_UNLOCK_CLEAR_CONVERT_TYPE 0x00000010
58
59
60static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
61 struct dlm_lock_resource *res,
62 struct dlm_lock *lock,
63 struct dlm_lockstatus *lksb,
64 int *actions);
65static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
66 struct dlm_lock_resource *res,
67 struct dlm_lock *lock,
68 struct dlm_lockstatus *lksb,
69 int *actions);
70
71static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
72 struct dlm_lock_resource *res,
73 struct dlm_lock *lock,
74 struct dlm_lockstatus *lksb,
75 int flags,
76 u8 owner);
77
78
79/*
80 * according to the spec:
81 * http://opendlm.sourceforge.net/cvsmirror/opendlm/docs/dlmbook_final.pdf
82 *
83 * flags & LKM_CANCEL != 0: must be converting or blocked
84 * flags & LKM_CANCEL == 0: must be granted
85 *
86 * So to unlock a converting lock, you must first cancel the
87 * convert (passing LKM_CANCEL in flags), then call the unlock
88 * again (with no LKM_CANCEL in flags).
89 */
90
91
92/*
93 * locking:
94 * caller needs: none
95 * taken: res->spinlock and lock->spinlock taken and dropped
96 * held on exit: none
97 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
98 * all callers should have taken an extra ref on lock coming in
99 */
100static enum dlm_status dlmunlock_common(struct dlm_ctxt *dlm,
101 struct dlm_lock_resource *res,
102 struct dlm_lock *lock,
103 struct dlm_lockstatus *lksb,
104 int flags, int *call_ast,
105 int master_node)
106{
107 enum dlm_status status;
108 int actions = 0;
109 int in_use;
110 u8 owner;
111
112 mlog(0, "master_node = %d, valblk = %d\n", master_node,
113 flags & LKM_VALBLK);
114
115 if (master_node)
116 BUG_ON(res->owner != dlm->node_num);
117 else
118 BUG_ON(res->owner == dlm->node_num);
119
120 spin_lock(&dlm->spinlock);
121 /* We want to be sure that we're not freeing a lock
122 * that still has AST's pending... */
123 in_use = !list_empty(&lock->ast_list);
124 spin_unlock(&dlm->spinlock);
125 if (in_use) {
126 mlog(ML_ERROR, "lockres %.*s: Someone is calling dlmunlock "
127 "while waiting for an ast!", res->lockname.len,
128 res->lockname.name);
129 return DLM_BADPARAM;
130 }
131
132 spin_lock(&res->spinlock);
133 if (res->state & DLM_LOCK_RES_IN_PROGRESS) {
134 if (master_node) {
135 mlog(ML_ERROR, "lockres in progress!\n");
136 spin_unlock(&res->spinlock);
137 return DLM_FORWARD;
138 }
139 /* ok for this to sleep if not in a network handler */
140 __dlm_wait_on_lockres(res);
141 res->state |= DLM_LOCK_RES_IN_PROGRESS;
142 }
143 spin_lock(&lock->spinlock);
144
145 if (res->state & DLM_LOCK_RES_RECOVERING) {
146 status = DLM_RECOVERING;
147 goto leave;
148 }
149
150
151 /* see above for what the spec says about
152 * LKM_CANCEL and the lock queue state */
153 if (flags & LKM_CANCEL)
154 status = dlm_get_cancel_actions(dlm, res, lock, lksb, &actions);
155 else
156 status = dlm_get_unlock_actions(dlm, res, lock, lksb, &actions);
157
158 if (status != DLM_NORMAL)
159 goto leave;
160
161 /* By now this has been masked out of cancel requests. */
162 if (flags & LKM_VALBLK) {
163 /* make the final update to the lvb */
164 if (master_node)
165 memcpy(res->lvb, lksb->lvb, DLM_LVB_LEN);
166 else
167 flags |= LKM_PUT_LVB; /* let the send function
168 * handle it. */
169 }
170
171 if (!master_node) {
172 owner = res->owner;
173 /* drop locks and send message */
174 if (flags & LKM_CANCEL)
175 lock->cancel_pending = 1;
176 else
177 lock->unlock_pending = 1;
178 spin_unlock(&lock->spinlock);
179 spin_unlock(&res->spinlock);
180 status = dlm_send_remote_unlock_request(dlm, res, lock, lksb,
181 flags, owner);
182 spin_lock(&res->spinlock);
183 spin_lock(&lock->spinlock);
184 /* if the master told us the lock was already granted,
185 * let the ast handle all of these actions */
186 if (status == DLM_NORMAL &&
187 lksb->status == DLM_CANCELGRANT) {
188 actions &= ~(DLM_UNLOCK_REMOVE_LOCK|
189 DLM_UNLOCK_REGRANT_LOCK|
190 DLM_UNLOCK_CLEAR_CONVERT_TYPE);
Kurt Hackele2faea42006-01-12 14:24:55 -0800191 } else if (status == DLM_RECOVERING ||
192 status == DLM_MIGRATING ||
193 status == DLM_FORWARD) {
194 /* must clear the actions because this unlock
195 * is about to be retried. cannot free or do
196 * any list manipulation. */
197 mlog(0, "%s:%.*s: clearing actions, %s\n",
198 dlm->name, res->lockname.len,
199 res->lockname.name,
200 status==DLM_RECOVERING?"recovering":
201 (status==DLM_MIGRATING?"migrating":
202 "forward"));
203 actions = 0;
Kurt Hackel6714d8e2005-12-15 14:31:23 -0800204 }
205 if (flags & LKM_CANCEL)
206 lock->cancel_pending = 0;
207 else
208 lock->unlock_pending = 0;
209
210 }
211
212 /* get an extra ref on lock. if we are just switching
213 * lists here, we dont want the lock to go away. */
214 dlm_lock_get(lock);
215
216 if (actions & DLM_UNLOCK_REMOVE_LOCK) {
217 list_del_init(&lock->list);
218 dlm_lock_put(lock);
219 }
220 if (actions & DLM_UNLOCK_REGRANT_LOCK) {
221 dlm_lock_get(lock);
222 list_add_tail(&lock->list, &res->granted);
223 }
224 if (actions & DLM_UNLOCK_CLEAR_CONVERT_TYPE) {
225 mlog(0, "clearing convert_type at %smaster node\n",
226 master_node ? "" : "non-");
227 lock->ml.convert_type = LKM_IVMODE;
228 }
229
230 /* remove the extra ref on lock */
231 dlm_lock_put(lock);
232
233leave:
234 res->state &= ~DLM_LOCK_RES_IN_PROGRESS;
235 if (!dlm_lock_on_list(&res->converting, lock))
236 BUG_ON(lock->ml.convert_type != LKM_IVMODE);
237 else
238 BUG_ON(lock->ml.convert_type == LKM_IVMODE);
239 spin_unlock(&lock->spinlock);
240 spin_unlock(&res->spinlock);
241 wake_up(&res->wq);
242
243 /* let the caller's final dlm_lock_put handle the actual kfree */
244 if (actions & DLM_UNLOCK_FREE_LOCK) {
245 /* this should always be coupled with list removal */
246 BUG_ON(!(actions & DLM_UNLOCK_REMOVE_LOCK));
247 mlog(0, "lock %"MLFu64" should be gone now! refs=%d\n",
248 lock->ml.cookie, atomic_read(&lock->lock_refs.refcount)-1);
249 dlm_lock_put(lock);
250 }
251 if (actions & DLM_UNLOCK_CALL_AST)
252 *call_ast = 1;
253
254 /* if cancel or unlock succeeded, lvb work is done */
255 if (status == DLM_NORMAL)
256 lksb->flags &= ~(DLM_LKSB_PUT_LVB|DLM_LKSB_GET_LVB);
257
258 return status;
259}
260
261void dlm_commit_pending_unlock(struct dlm_lock_resource *res,
262 struct dlm_lock *lock)
263{
264 /* leave DLM_LKSB_PUT_LVB on the lksb so any final
265 * update of the lvb will be sent to the new master */
266 list_del_init(&lock->list);
267}
268
269void dlm_commit_pending_cancel(struct dlm_lock_resource *res,
270 struct dlm_lock *lock)
271{
272 list_del_init(&lock->list);
273 list_add_tail(&lock->list, &res->granted);
274 lock->ml.convert_type = LKM_IVMODE;
275}
276
277
278static inline enum dlm_status dlmunlock_master(struct dlm_ctxt *dlm,
279 struct dlm_lock_resource *res,
280 struct dlm_lock *lock,
281 struct dlm_lockstatus *lksb,
282 int flags,
283 int *call_ast)
284{
285 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 1);
286}
287
288static inline enum dlm_status dlmunlock_remote(struct dlm_ctxt *dlm,
289 struct dlm_lock_resource *res,
290 struct dlm_lock *lock,
291 struct dlm_lockstatus *lksb,
292 int flags, int *call_ast)
293{
294 return dlmunlock_common(dlm, res, lock, lksb, flags, call_ast, 0);
295}
296
297/*
298 * locking:
299 * caller needs: none
300 * taken: none
301 * held on exit: none
302 * returns: DLM_NORMAL, DLM_NOLOCKMGR, status from network
303 */
304static enum dlm_status dlm_send_remote_unlock_request(struct dlm_ctxt *dlm,
305 struct dlm_lock_resource *res,
306 struct dlm_lock *lock,
307 struct dlm_lockstatus *lksb,
308 int flags,
309 u8 owner)
310{
311 struct dlm_unlock_lock unlock;
312 int tmpret;
313 enum dlm_status ret;
314 int status = 0;
315 struct kvec vec[2];
316 size_t veclen = 1;
317
318 mlog_entry("%.*s\n", res->lockname.len, res->lockname.name);
319
320 memset(&unlock, 0, sizeof(unlock));
321 unlock.node_idx = dlm->node_num;
322 unlock.flags = cpu_to_be32(flags);
323 unlock.cookie = lock->ml.cookie;
324 unlock.namelen = res->lockname.len;
325 memcpy(unlock.name, res->lockname.name, unlock.namelen);
326
327 vec[0].iov_len = sizeof(struct dlm_unlock_lock);
328 vec[0].iov_base = &unlock;
329
330 if (flags & LKM_PUT_LVB) {
331 /* extra data to send if we are updating lvb */
332 vec[1].iov_len = DLM_LVB_LEN;
333 vec[1].iov_base = lock->lksb->lvb;
334 veclen++;
335 }
336
337 tmpret = o2net_send_message_vec(DLM_UNLOCK_LOCK_MSG, dlm->key,
338 vec, veclen, owner, &status);
339 if (tmpret >= 0) {
340 // successfully sent and received
341 if (status == DLM_CANCELGRANT)
342 ret = DLM_NORMAL;
343 else if (status == DLM_FORWARD) {
344 mlog(0, "master was in-progress. retry\n");
345 ret = DLM_FORWARD;
346 } else
347 ret = status;
348 lksb->status = status;
349 } else {
350 mlog_errno(tmpret);
351 if (dlm_is_host_down(tmpret)) {
352 /* NOTE: this seems strange, but it is what we want.
353 * when the master goes down during a cancel or
354 * unlock, the recovery code completes the operation
355 * as if the master had not died, then passes the
356 * updated state to the recovery master. this thread
357 * just needs to finish out the operation and call
358 * the unlockast. */
359 ret = DLM_NORMAL;
360 } else {
361 /* something bad. this will BUG in ocfs2 */
362 ret = dlm_err_to_dlm_status(tmpret);
363 }
364 lksb->status = ret;
365 }
366
367 return ret;
368}
369
370/*
371 * locking:
372 * caller needs: none
373 * taken: takes and drops res->spinlock
374 * held on exit: none
375 * returns: DLM_NORMAL, DLM_BADARGS, DLM_IVLOCKID,
376 * return value from dlmunlock_master
377 */
378int dlm_unlock_lock_handler(struct o2net_msg *msg, u32 len, void *data)
379{
380 struct dlm_ctxt *dlm = data;
381 struct dlm_unlock_lock *unlock = (struct dlm_unlock_lock *)msg->buf;
382 struct dlm_lock_resource *res = NULL;
383 struct list_head *iter;
384 struct dlm_lock *lock = NULL;
385 enum dlm_status status = DLM_NORMAL;
386 int found = 0, i;
387 struct dlm_lockstatus *lksb = NULL;
388 int ignore;
389 u32 flags;
390 struct list_head *queue;
391
392 flags = be32_to_cpu(unlock->flags);
393
394 if (flags & LKM_GET_LVB) {
395 mlog(ML_ERROR, "bad args! GET_LVB specified on unlock!\n");
396 return DLM_BADARGS;
397 }
398
399 if ((flags & (LKM_PUT_LVB|LKM_CANCEL)) == (LKM_PUT_LVB|LKM_CANCEL)) {
400 mlog(ML_ERROR, "bad args! cannot modify lvb on a CANCEL "
401 "request!\n");
402 return DLM_BADARGS;
403 }
404
405 if (unlock->namelen > DLM_LOCKID_NAME_MAX) {
406 mlog(ML_ERROR, "Invalid name length in unlock handler!\n");
407 return DLM_IVBUFLEN;
408 }
409
410 if (!dlm_grab(dlm))
411 return DLM_REJECTED;
412
413 mlog_bug_on_msg(!dlm_domain_fully_joined(dlm),
414 "Domain %s not fully joined!\n", dlm->name);
415
416 mlog(0, "lvb: %s\n", flags & LKM_PUT_LVB ? "put lvb" : "none");
417
418 res = dlm_lookup_lockres(dlm, unlock->name, unlock->namelen);
419 if (!res) {
420 /* We assume here that a no lock resource simply means
421 * it was migrated away and destroyed before the other
422 * node could detect it. */
423 mlog(0, "returning DLM_FORWARD -- res no longer exists\n");
424 status = DLM_FORWARD;
425 goto not_found;
426 }
427
428 queue=&res->granted;
429 found = 0;
430 spin_lock(&res->spinlock);
431 if (res->state & DLM_LOCK_RES_RECOVERING) {
432 spin_unlock(&res->spinlock);
433 mlog(0, "returning DLM_RECOVERING\n");
434 status = DLM_RECOVERING;
435 goto leave;
436 }
437
438 if (res->state & DLM_LOCK_RES_MIGRATING) {
439 spin_unlock(&res->spinlock);
440 mlog(0, "returning DLM_MIGRATING\n");
441 status = DLM_MIGRATING;
442 goto leave;
443 }
444
445 if (res->owner != dlm->node_num) {
446 spin_unlock(&res->spinlock);
447 mlog(0, "returning DLM_FORWARD -- not master\n");
448 status = DLM_FORWARD;
449 goto leave;
450 }
451
452 for (i=0; i<3; i++) {
453 list_for_each(iter, queue) {
454 lock = list_entry(iter, struct dlm_lock, list);
455 if (lock->ml.cookie == unlock->cookie &&
456 lock->ml.node == unlock->node_idx) {
457 dlm_lock_get(lock);
458 found = 1;
459 break;
460 }
461 }
462 if (found)
463 break;
464 /* scan granted -> converting -> blocked queues */
465 queue++;
466 }
467 spin_unlock(&res->spinlock);
468 if (!found) {
469 status = DLM_IVLOCKID;
470 goto not_found;
471 }
472
473 /* lock was found on queue */
474 lksb = lock->lksb;
475 /* unlockast only called on originating node */
476 if (flags & LKM_PUT_LVB) {
477 lksb->flags |= DLM_LKSB_PUT_LVB;
478 memcpy(&lksb->lvb[0], &unlock->lvb[0], DLM_LVB_LEN);
479 }
480
481 /* if this is in-progress, propagate the DLM_FORWARD
482 * all the way back out */
483 status = dlmunlock_master(dlm, res, lock, lksb, flags, &ignore);
484 if (status == DLM_FORWARD)
485 mlog(0, "lockres is in progress\n");
486
487 if (flags & LKM_PUT_LVB)
488 lksb->flags &= ~DLM_LKSB_PUT_LVB;
489
490 dlm_lockres_calc_usage(dlm, res);
491 dlm_kick_thread(dlm, res);
492
493not_found:
494 if (!found)
495 mlog(ML_ERROR, "failed to find lock to unlock! "
496 "cookie=%"MLFu64"\n",
497 unlock->cookie);
498 else {
499 /* send the lksb->status back to the other node */
500 status = lksb->status;
501 dlm_lock_put(lock);
502 }
503
504leave:
505 if (res)
506 dlm_lockres_put(res);
507
508 dlm_put(dlm);
509
510 return status;
511}
512
513
514static enum dlm_status dlm_get_cancel_actions(struct dlm_ctxt *dlm,
515 struct dlm_lock_resource *res,
516 struct dlm_lock *lock,
517 struct dlm_lockstatus *lksb,
518 int *actions)
519{
520 enum dlm_status status;
521
522 if (dlm_lock_on_list(&res->blocked, lock)) {
523 /* cancel this outright */
524 lksb->status = DLM_NORMAL;
525 status = DLM_NORMAL;
526 *actions = (DLM_UNLOCK_CALL_AST |
527 DLM_UNLOCK_REMOVE_LOCK);
528 } else if (dlm_lock_on_list(&res->converting, lock)) {
529 /* cancel the request, put back on granted */
530 lksb->status = DLM_NORMAL;
531 status = DLM_NORMAL;
532 *actions = (DLM_UNLOCK_CALL_AST |
533 DLM_UNLOCK_REMOVE_LOCK |
534 DLM_UNLOCK_REGRANT_LOCK |
535 DLM_UNLOCK_CLEAR_CONVERT_TYPE);
536 } else if (dlm_lock_on_list(&res->granted, lock)) {
537 /* too late, already granted. DLM_CANCELGRANT */
538 lksb->status = DLM_CANCELGRANT;
539 status = DLM_NORMAL;
540 *actions = DLM_UNLOCK_CALL_AST;
541 } else {
542 mlog(ML_ERROR, "lock to cancel is not on any list!\n");
543 lksb->status = DLM_IVLOCKID;
544 status = DLM_IVLOCKID;
545 *actions = 0;
546 }
547 return status;
548}
549
550static enum dlm_status dlm_get_unlock_actions(struct dlm_ctxt *dlm,
551 struct dlm_lock_resource *res,
552 struct dlm_lock *lock,
553 struct dlm_lockstatus *lksb,
554 int *actions)
555{
556 enum dlm_status status;
557
558 /* unlock request */
559 if (!dlm_lock_on_list(&res->granted, lock)) {
560 lksb->status = DLM_DENIED;
561 status = DLM_DENIED;
562 dlm_error(status);
563 *actions = 0;
564 } else {
565 /* unlock granted lock */
566 lksb->status = DLM_NORMAL;
567 status = DLM_NORMAL;
568 *actions = (DLM_UNLOCK_FREE_LOCK |
569 DLM_UNLOCK_CALL_AST |
570 DLM_UNLOCK_REMOVE_LOCK);
571 }
572 return status;
573}
574
575/* there seems to be no point in doing this async
576 * since (even for the remote case) there is really
577 * no work to queue up... so just do it and fire the
578 * unlockast by hand when done... */
579enum dlm_status dlmunlock(struct dlm_ctxt *dlm, struct dlm_lockstatus *lksb,
580 int flags, dlm_astunlockfunc_t *unlockast, void *data)
581{
582 enum dlm_status status;
583 struct dlm_lock_resource *res;
584 struct dlm_lock *lock = NULL;
585 int call_ast, is_master;
586
587 mlog_entry_void();
588
589 if (!lksb) {
590 dlm_error(DLM_BADARGS);
591 return DLM_BADARGS;
592 }
593
594 if (flags & ~(LKM_CANCEL | LKM_VALBLK | LKM_INVVALBLK)) {
595 dlm_error(DLM_BADPARAM);
596 return DLM_BADPARAM;
597 }
598
599 if ((flags & (LKM_VALBLK | LKM_CANCEL)) == (LKM_VALBLK | LKM_CANCEL)) {
600 mlog(0, "VALBLK given with CANCEL: ignoring VALBLK\n");
601 flags &= ~LKM_VALBLK;
602 }
603
604 if (!lksb->lockid || !lksb->lockid->lockres) {
605 dlm_error(DLM_BADPARAM);
606 return DLM_BADPARAM;
607 }
608
609 lock = lksb->lockid;
610 BUG_ON(!lock);
611 dlm_lock_get(lock);
612
613 res = lock->lockres;
614 BUG_ON(!res);
615 dlm_lockres_get(res);
616retry:
617 call_ast = 0;
618 /* need to retry up here because owner may have changed */
619 mlog(0, "lock=%p res=%p\n", lock, res);
620
621 spin_lock(&res->spinlock);
622 is_master = (res->owner == dlm->node_num);
623 spin_unlock(&res->spinlock);
624
625 if (is_master) {
626 status = dlmunlock_master(dlm, res, lock, lksb, flags,
627 &call_ast);
628 mlog(0, "done calling dlmunlock_master: returned %d, "
629 "call_ast is %d\n", status, call_ast);
630 } else {
631 status = dlmunlock_remote(dlm, res, lock, lksb, flags,
632 &call_ast);
633 mlog(0, "done calling dlmunlock_remote: returned %d, "
634 "call_ast is %d\n", status, call_ast);
635 }
636
637 if (status == DLM_RECOVERING ||
638 status == DLM_MIGRATING ||
639 status == DLM_FORWARD) {
640 /* We want to go away for a tiny bit to allow recovery
641 * / migration to complete on this resource. I don't
642 * know of any wait queue we could sleep on as this
643 * may be happening on another node. Perhaps the
644 * proper solution is to queue up requests on the
645 * other end? */
646
647 /* do we want to yield(); ?? */
648 msleep(50);
649
650 mlog(0, "retrying unlock due to pending recovery/"
651 "migration/in-progress\n");
652 goto retry;
653 }
654
655 if (call_ast) {
656 mlog(0, "calling unlockast(%p, %d)\n", data, lksb->status);
657 if (is_master) {
658 /* it is possible that there is one last bast
659 * pending. make sure it is flushed, then
660 * call the unlockast.
661 * not an issue if this is a mastered remotely,
662 * since this lock has been removed from the
663 * lockres queues and cannot be found. */
664 dlm_kick_thread(dlm, NULL);
665 wait_event(dlm->ast_wq,
666 dlm_lock_basts_flushed(dlm, lock));
667 }
668 (*unlockast)(data, lksb->status);
669 }
670
671 if (status == DLM_NORMAL) {
672 mlog(0, "kicking the thread\n");
673 dlm_kick_thread(dlm, res);
674 } else
675 dlm_error(status);
676
677 dlm_lockres_calc_usage(dlm, res);
678 dlm_lockres_put(res);
679 dlm_lock_put(lock);
680
681 mlog(0, "returning status=%d!\n", status);
682 return status;
683}
684EXPORT_SYMBOL_GPL(dlmunlock);
685