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23#include <linux/types.h>
24#include <linux/errno.h>
25#include <linux/kernel.h>
26#include <linux/sched.h>
27#include <linux/smp_lock.h>
28#include <linux/sunrpc/clnt.h>
29#include <linux/sunrpc/svc.h>
30#include <linux/lockd/nlm.h>
31#include <linux/lockd/lockd.h>
32#include <linux/kthread.h>
33
34#define NLMDBG_FACILITY NLMDBG_SVCLOCK
35
36#ifdef CONFIG_LOCKD_V4
37#define nlm_deadlock nlm4_deadlock
38#else
39#define nlm_deadlock nlm_lck_denied
40#endif
41
42static void nlmsvc_release_block(struct nlm_block *block);
43static void nlmsvc_insert_block(struct nlm_block *block, unsigned long);
44static void nlmsvc_remove_block(struct nlm_block *block);
45
46static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock);
47static void nlmsvc_freegrantargs(struct nlm_rqst *call);
48static const struct rpc_call_ops nlmsvc_grant_ops;
49
50
51
52
53static LIST_HEAD(nlm_blocked);
54
55
56
57
58static void
59nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
60{
61 struct nlm_block *b;
62 struct list_head *pos;
63
64 dprintk("lockd: nlmsvc_insert_block(%p, %ld)\n", block, when);
65 if (list_empty(&block->b_list)) {
66 kref_get(&block->b_count);
67 } else {
68 list_del_init(&block->b_list);
69 }
70
71 pos = &nlm_blocked;
72 if (when != NLM_NEVER) {
73 if ((when += jiffies) == NLM_NEVER)
74 when ++;
75 list_for_each(pos, &nlm_blocked) {
76 b = list_entry(pos, struct nlm_block, b_list);
77 if (time_after(b->b_when,when) || b->b_when == NLM_NEVER)
78 break;
79 }
80
81
82
83 }
84
85 list_add_tail(&block->b_list, pos);
86 block->b_when = when;
87}
88
89
90
91
92static inline void
93nlmsvc_remove_block(struct nlm_block *block)
94{
95 if (!list_empty(&block->b_list)) {
96 list_del_init(&block->b_list);
97 nlmsvc_release_block(block);
98 }
99}
100
101
102
103
104static struct nlm_block *
105nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock)
106{
107 struct nlm_block *block;
108 struct file_lock *fl;
109
110 dprintk("lockd: nlmsvc_lookup_block f=%p pd=%d %Ld-%Ld ty=%d\n",
111 file, lock->fl.fl_pid,
112 (long long)lock->fl.fl_start,
113 (long long)lock->fl.fl_end, lock->fl.fl_type);
114 list_for_each_entry(block, &nlm_blocked, b_list) {
115 fl = &block->b_call->a_args.lock.fl;
116 dprintk("lockd: check f=%p pd=%d %Ld-%Ld ty=%d cookie=%s\n",
117 block->b_file, fl->fl_pid,
118 (long long)fl->fl_start,
119 (long long)fl->fl_end, fl->fl_type,
120 nlmdbg_cookie2a(&block->b_call->a_args.cookie));
121 if (block->b_file == file && nlm_compare_locks(fl, &lock->fl)) {
122 kref_get(&block->b_count);
123 return block;
124 }
125 }
126
127 return NULL;
128}
129
130static inline int nlm_cookie_match(struct nlm_cookie *a, struct nlm_cookie *b)
131{
132 if (a->len != b->len)
133 return 0;
134 if (memcmp(a->data, b->data, a->len))
135 return 0;
136 return 1;
137}
138
139
140
141
142static inline struct nlm_block *
143nlmsvc_find_block(struct nlm_cookie *cookie)
144{
145 struct nlm_block *block;
146
147 list_for_each_entry(block, &nlm_blocked, b_list) {
148 if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie))
149 goto found;
150 }
151
152 return NULL;
153
154found:
155 dprintk("nlmsvc_find_block(%s): block=%p\n", nlmdbg_cookie2a(cookie), block);
156 kref_get(&block->b_count);
157 return block;
158}
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175static struct nlm_block *
176nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_host *host,
177 struct nlm_file *file, struct nlm_lock *lock,
178 struct nlm_cookie *cookie)
179{
180 struct nlm_block *block;
181 struct nlm_rqst *call = NULL;
182
183 nlm_get_host(host);
184 call = nlm_alloc_call(host);
185 if (call == NULL)
186 return NULL;
187
188
189 block = kzalloc(sizeof(*block), GFP_KERNEL);
190 if (block == NULL)
191 goto failed;
192 kref_init(&block->b_count);
193 INIT_LIST_HEAD(&block->b_list);
194 INIT_LIST_HEAD(&block->b_flist);
195
196 if (!nlmsvc_setgrantargs(call, lock))
197 goto failed_free;
198
199
200 call->a_args.lock.fl.fl_flags |= FL_SLEEP;
201 call->a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations;
202 nlmclnt_next_cookie(&call->a_args.cookie);
203
204 dprintk("lockd: created block %p...\n", block);
205
206
207 block->b_daemon = rqstp->rq_server;
208 block->b_host = host;
209 block->b_file = file;
210 block->b_fl = NULL;
211 file->f_count++;
212
213
214 list_add(&block->b_flist, &file->f_blocks);
215
216
217 block->b_call = call;
218 call->a_flags = RPC_TASK_ASYNC;
219 call->a_block = block;
220
221 return block;
222
223failed_free:
224 kfree(block);
225failed:
226 nlm_release_call(call);
227 return NULL;
228}
229
230
231
232
233
234
235static int nlmsvc_unlink_block(struct nlm_block *block)
236{
237 int status;
238 dprintk("lockd: unlinking block %p...\n", block);
239
240
241 status = posix_unblock_lock(block->b_file->f_file, &block->b_call->a_args.lock.fl);
242 nlmsvc_remove_block(block);
243 return status;
244}
245
246static void nlmsvc_free_block(struct kref *kref)
247{
248 struct nlm_block *block = container_of(kref, struct nlm_block, b_count);
249 struct nlm_file *file = block->b_file;
250
251 dprintk("lockd: freeing block %p...\n", block);
252
253
254 mutex_lock(&file->f_mutex);
255 list_del_init(&block->b_flist);
256 mutex_unlock(&file->f_mutex);
257
258 nlmsvc_freegrantargs(block->b_call);
259 nlm_release_call(block->b_call);
260 nlm_release_file(block->b_file);
261 kfree(block->b_fl);
262 kfree(block);
263}
264
265static void nlmsvc_release_block(struct nlm_block *block)
266{
267 if (block != NULL)
268 kref_put(&block->b_count, nlmsvc_free_block);
269}
270
271
272
273
274
275void nlmsvc_traverse_blocks(struct nlm_host *host,
276 struct nlm_file *file,
277 nlm_host_match_fn_t match)
278{
279 struct nlm_block *block, *next;
280
281restart:
282 mutex_lock(&file->f_mutex);
283 list_for_each_entry_safe(block, next, &file->f_blocks, b_flist) {
284 if (!match(block->b_host, host))
285 continue;
286
287
288 if (list_empty(&block->b_list))
289 continue;
290 kref_get(&block->b_count);
291 mutex_unlock(&file->f_mutex);
292 nlmsvc_unlink_block(block);
293 nlmsvc_release_block(block);
294 goto restart;
295 }
296 mutex_unlock(&file->f_mutex);
297}
298
299
300
301
302
303static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock)
304{
305 locks_copy_lock(&call->a_args.lock.fl, &lock->fl);
306 memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh));
307 call->a_args.lock.caller = utsname()->nodename;
308 call->a_args.lock.oh.len = lock->oh.len;
309
310
311 call->a_args.lock.oh.data = call->a_owner;
312 call->a_args.lock.svid = lock->fl.fl_pid;
313
314 if (lock->oh.len > NLMCLNT_OHSIZE) {
315 void *data = kmalloc(lock->oh.len, GFP_KERNEL);
316 if (!data)
317 return 0;
318 call->a_args.lock.oh.data = (u8 *) data;
319 }
320
321 memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len);
322 return 1;
323}
324
325static void nlmsvc_freegrantargs(struct nlm_rqst *call)
326{
327 if (call->a_args.lock.oh.data != call->a_owner)
328 kfree(call->a_args.lock.oh.data);
329
330 locks_release_private(&call->a_args.lock.fl);
331}
332
333
334
335
336static __be32
337nlmsvc_defer_lock_rqst(struct svc_rqst *rqstp, struct nlm_block *block)
338{
339 __be32 status = nlm_lck_denied_nolocks;
340
341 block->b_flags |= B_QUEUED;
342
343 nlmsvc_insert_block(block, NLM_TIMEOUT);
344
345 block->b_cache_req = &rqstp->rq_chandle;
346 if (rqstp->rq_chandle.defer) {
347 block->b_deferred_req =
348 rqstp->rq_chandle.defer(block->b_cache_req);
349 if (block->b_deferred_req != NULL)
350 status = nlm_drop_reply;
351 }
352 dprintk("lockd: nlmsvc_defer_lock_rqst block %p flags %d status %d\n",
353 block, block->b_flags, ntohl(status));
354
355 return status;
356}
357
358
359
360
361
362__be32
363nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
364 struct nlm_host *host, struct nlm_lock *lock, int wait,
365 struct nlm_cookie *cookie, int reclaim)
366{
367 struct nlm_block *block = NULL;
368 int error;
369 __be32 ret;
370
371 dprintk("lockd: nlmsvc_lock(%s/%ld, ty=%d, pi=%d, %Ld-%Ld, bl=%d)\n",
372 file->f_file->f_path.dentry->d_inode->i_sb->s_id,
373 file->f_file->f_path.dentry->d_inode->i_ino,
374 lock->fl.fl_type, lock->fl.fl_pid,
375 (long long)lock->fl.fl_start,
376 (long long)lock->fl.fl_end,
377 wait);
378
379
380 mutex_lock(&file->f_mutex);
381
382
383
384 block = nlmsvc_lookup_block(file, lock);
385 if (block == NULL) {
386 block = nlmsvc_create_block(rqstp, host, file, lock, cookie);
387 ret = nlm_lck_denied_nolocks;
388 if (block == NULL)
389 goto out;
390 lock = &block->b_call->a_args.lock;
391 } else
392 lock->fl.fl_flags &= ~FL_SLEEP;
393
394 if (block->b_flags & B_QUEUED) {
395 dprintk("lockd: nlmsvc_lock deferred block %p flags %d\n",
396 block, block->b_flags);
397 if (block->b_granted) {
398 nlmsvc_unlink_block(block);
399 ret = nlm_granted;
400 goto out;
401 }
402 if (block->b_flags & B_TIMED_OUT) {
403 nlmsvc_unlink_block(block);
404 ret = nlm_lck_denied;
405 goto out;
406 }
407 ret = nlm_drop_reply;
408 goto out;
409 }
410
411 if (locks_in_grace() && !reclaim) {
412 ret = nlm_lck_denied_grace_period;
413 goto out;
414 }
415 if (reclaim && !locks_in_grace()) {
416 ret = nlm_lck_denied_grace_period;
417 goto out;
418 }
419
420 if (!wait)
421 lock->fl.fl_flags &= ~FL_SLEEP;
422 error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
423 lock->fl.fl_flags &= ~FL_SLEEP;
424
425 dprintk("lockd: vfs_lock_file returned %d\n", error);
426 switch (error) {
427 case 0:
428 ret = nlm_granted;
429 goto out;
430 case -EAGAIN:
431
432
433
434
435
436 if (wait)
437 break;
438 ret = nlm_lck_denied;
439 goto out;
440 case FILE_LOCK_DEFERRED:
441 if (wait)
442 break;
443
444
445 ret = nlmsvc_defer_lock_rqst(rqstp, block);
446 goto out;
447 case -EDEADLK:
448 ret = nlm_deadlock;
449 goto out;
450 default:
451 ret = nlm_lck_denied_nolocks;
452 goto out;
453 }
454
455 ret = nlm_lck_blocked;
456
457
458 nlmsvc_insert_block(block, NLM_NEVER);
459out:
460 mutex_unlock(&file->f_mutex);
461 nlmsvc_release_block(block);
462 dprintk("lockd: nlmsvc_lock returned %u\n", ret);
463 return ret;
464}
465
466
467
468
469__be32
470nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
471 struct nlm_host *host, struct nlm_lock *lock,
472 struct nlm_lock *conflock, struct nlm_cookie *cookie)
473{
474 struct nlm_block *block = NULL;
475 int error;
476 __be32 ret;
477
478 dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
479 file->f_file->f_path.dentry->d_inode->i_sb->s_id,
480 file->f_file->f_path.dentry->d_inode->i_ino,
481 lock->fl.fl_type,
482 (long long)lock->fl.fl_start,
483 (long long)lock->fl.fl_end);
484
485
486 block = nlmsvc_lookup_block(file, lock);
487
488 if (block == NULL) {
489 struct file_lock *conf = kzalloc(sizeof(*conf), GFP_KERNEL);
490
491 if (conf == NULL)
492 return nlm_granted;
493 block = nlmsvc_create_block(rqstp, host, file, lock, cookie);
494 if (block == NULL) {
495 kfree(conf);
496 return nlm_granted;
497 }
498 block->b_fl = conf;
499 }
500 if (block->b_flags & B_QUEUED) {
501 dprintk("lockd: nlmsvc_testlock deferred block %p flags %d fl %p\n",
502 block, block->b_flags, block->b_fl);
503 if (block->b_flags & B_TIMED_OUT) {
504 nlmsvc_unlink_block(block);
505 ret = nlm_lck_denied;
506 goto out;
507 }
508 if (block->b_flags & B_GOT_CALLBACK) {
509 nlmsvc_unlink_block(block);
510 if (block->b_fl != NULL
511 && block->b_fl->fl_type != F_UNLCK) {
512 lock->fl = *block->b_fl;
513 goto conf_lock;
514 } else {
515 ret = nlm_granted;
516 goto out;
517 }
518 }
519 ret = nlm_drop_reply;
520 goto out;
521 }
522
523 if (locks_in_grace()) {
524 ret = nlm_lck_denied_grace_period;
525 goto out;
526 }
527 error = vfs_test_lock(file->f_file, &lock->fl);
528 if (error == FILE_LOCK_DEFERRED) {
529 ret = nlmsvc_defer_lock_rqst(rqstp, block);
530 goto out;
531 }
532 if (error) {
533 ret = nlm_lck_denied_nolocks;
534 goto out;
535 }
536 if (lock->fl.fl_type == F_UNLCK) {
537 ret = nlm_granted;
538 goto out;
539 }
540
541conf_lock:
542 dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n",
543 lock->fl.fl_type, (long long)lock->fl.fl_start,
544 (long long)lock->fl.fl_end);
545 conflock->caller = "somehost";
546 conflock->len = strlen(conflock->caller);
547 conflock->oh.len = 0;
548 conflock->svid = lock->fl.fl_pid;
549 conflock->fl.fl_type = lock->fl.fl_type;
550 conflock->fl.fl_start = lock->fl.fl_start;
551 conflock->fl.fl_end = lock->fl.fl_end;
552 ret = nlm_lck_denied;
553out:
554 if (block)
555 nlmsvc_release_block(block);
556 return ret;
557}
558
559
560
561
562
563
564
565
566__be32
567nlmsvc_unlock(struct nlm_file *file, struct nlm_lock *lock)
568{
569 int error;
570
571 dprintk("lockd: nlmsvc_unlock(%s/%ld, pi=%d, %Ld-%Ld)\n",
572 file->f_file->f_path.dentry->d_inode->i_sb->s_id,
573 file->f_file->f_path.dentry->d_inode->i_ino,
574 lock->fl.fl_pid,
575 (long long)lock->fl.fl_start,
576 (long long)lock->fl.fl_end);
577
578
579 nlmsvc_cancel_blocked(file, lock);
580
581 lock->fl.fl_type = F_UNLCK;
582 error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
583
584 return (error < 0)? nlm_lck_denied_nolocks : nlm_granted;
585}
586
587
588
589
590
591
592
593
594__be32
595nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
596{
597 struct nlm_block *block;
598 int status = 0;
599
600 dprintk("lockd: nlmsvc_cancel(%s/%ld, pi=%d, %Ld-%Ld)\n",
601 file->f_file->f_path.dentry->d_inode->i_sb->s_id,
602 file->f_file->f_path.dentry->d_inode->i_ino,
603 lock->fl.fl_pid,
604 (long long)lock->fl.fl_start,
605 (long long)lock->fl.fl_end);
606
607 if (locks_in_grace())
608 return nlm_lck_denied_grace_period;
609
610 mutex_lock(&file->f_mutex);
611 block = nlmsvc_lookup_block(file, lock);
612 mutex_unlock(&file->f_mutex);
613 if (block != NULL) {
614 vfs_cancel_lock(block->b_file->f_file,
615 &block->b_call->a_args.lock.fl);
616 status = nlmsvc_unlink_block(block);
617 nlmsvc_release_block(block);
618 }
619 return status ? nlm_lck_denied : nlm_granted;
620}
621
622
623
624
625
626
627
628
629
630
631
632static void
633nlmsvc_update_deferred_block(struct nlm_block *block, struct file_lock *conf,
634 int result)
635{
636 block->b_flags |= B_GOT_CALLBACK;
637 if (result == 0)
638 block->b_granted = 1;
639 else
640 block->b_flags |= B_TIMED_OUT;
641 if (conf) {
642 if (block->b_fl)
643 __locks_copy_lock(block->b_fl, conf);
644 }
645}
646
647static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf,
648 int result)
649{
650 struct nlm_block *block;
651 int rc = -ENOENT;
652
653 lock_kernel();
654 list_for_each_entry(block, &nlm_blocked, b_list) {
655 if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
656 dprintk("lockd: nlmsvc_notify_blocked block %p flags %d\n",
657 block, block->b_flags);
658 if (block->b_flags & B_QUEUED) {
659 if (block->b_flags & B_TIMED_OUT) {
660 rc = -ENOLCK;
661 break;
662 }
663 nlmsvc_update_deferred_block(block, conf, result);
664 } else if (result == 0)
665 block->b_granted = 1;
666
667 nlmsvc_insert_block(block, 0);
668 svc_wake_up(block->b_daemon);
669 rc = 0;
670 break;
671 }
672 }
673 unlock_kernel();
674 if (rc == -ENOENT)
675 printk(KERN_WARNING "lockd: grant for unknown block\n");
676 return rc;
677}
678
679
680
681
682
683
684
685
686static void
687nlmsvc_notify_blocked(struct file_lock *fl)
688{
689 struct nlm_block *block;
690
691 dprintk("lockd: VFS unblock notification for block %p\n", fl);
692 list_for_each_entry(block, &nlm_blocked, b_list) {
693 if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
694 nlmsvc_insert_block(block, 0);
695 svc_wake_up(block->b_daemon);
696 return;
697 }
698 }
699
700 printk(KERN_WARNING "lockd: notification for unknown block!\n");
701}
702
703static int nlmsvc_same_owner(struct file_lock *fl1, struct file_lock *fl2)
704{
705 return fl1->fl_owner == fl2->fl_owner && fl1->fl_pid == fl2->fl_pid;
706}
707
708const struct lock_manager_operations nlmsvc_lock_operations = {
709 .fl_compare_owner = nlmsvc_same_owner,
710 .fl_notify = nlmsvc_notify_blocked,
711 .fl_grant = nlmsvc_grant_deferred,
712};
713
714
715
716
717
718
719
720
721
722
723
724
725static void
726nlmsvc_grant_blocked(struct nlm_block *block)
727{
728 struct nlm_file *file = block->b_file;
729 struct nlm_lock *lock = &block->b_call->a_args.lock;
730 int error;
731
732 dprintk("lockd: grant blocked lock %p\n", block);
733
734 kref_get(&block->b_count);
735
736
737 nlmsvc_unlink_block(block);
738
739
740
741
742 if (block->b_granted) {
743 nlm_rebind_host(block->b_host);
744 goto callback;
745 }
746
747
748 lock->fl.fl_flags |= FL_SLEEP;
749 error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
750 lock->fl.fl_flags &= ~FL_SLEEP;
751
752 switch (error) {
753 case 0:
754 break;
755 case FILE_LOCK_DEFERRED:
756 dprintk("lockd: lock still blocked error %d\n", error);
757 nlmsvc_insert_block(block, NLM_NEVER);
758 nlmsvc_release_block(block);
759 return;
760 default:
761 printk(KERN_WARNING "lockd: unexpected error %d in %s!\n",
762 -error, __func__);
763 nlmsvc_insert_block(block, 10 * HZ);
764 nlmsvc_release_block(block);
765 return;
766 }
767
768callback:
769
770 dprintk("lockd: GRANTing blocked lock.\n");
771 block->b_granted = 1;
772
773
774
775
776 nlmsvc_insert_block(block, NLM_NEVER);
777
778
779
780
781 error = nlm_async_call(block->b_call, NLMPROC_GRANTED_MSG,
782 &nlmsvc_grant_ops);
783
784
785 if (error < 0)
786 nlmsvc_insert_block(block, 10 * HZ);
787}
788
789
790
791
792
793
794
795
796
797static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
798{
799 struct nlm_rqst *call = data;
800 struct nlm_block *block = call->a_block;
801 unsigned long timeout;
802
803 dprintk("lockd: GRANT_MSG RPC callback\n");
804
805 lock_kernel();
806
807
808
809
810
811
812
813
814 if (list_empty(&block->b_list))
815 goto out;
816
817
818
819
820 if (task->tk_status < 0) {
821
822 timeout = 10 * HZ;
823 } else {
824
825 timeout = 60 * HZ;
826 }
827 nlmsvc_insert_block(block, timeout);
828 svc_wake_up(block->b_daemon);
829out:
830 unlock_kernel();
831}
832
833static void nlmsvc_grant_release(void *data)
834{
835 struct nlm_rqst *call = data;
836
837 lock_kernel();
838 nlmsvc_release_block(call->a_block);
839 unlock_kernel();
840}
841
842static const struct rpc_call_ops nlmsvc_grant_ops = {
843 .rpc_call_done = nlmsvc_grant_callback,
844 .rpc_release = nlmsvc_grant_release,
845};
846
847
848
849
850
851void
852nlmsvc_grant_reply(struct nlm_cookie *cookie, __be32 status)
853{
854 struct nlm_block *block;
855
856 dprintk("grant_reply: looking for cookie %x, s=%d \n",
857 *(unsigned int *)(cookie->data), status);
858 if (!(block = nlmsvc_find_block(cookie)))
859 return;
860
861 if (block) {
862 if (status == nlm_lck_denied_grace_period) {
863
864 nlmsvc_insert_block(block, 10 * HZ);
865 } else {
866
867
868 nlmsvc_unlink_block(block);
869 }
870 }
871 nlmsvc_release_block(block);
872}
873
874
875
876
877
878static void
879retry_deferred_block(struct nlm_block *block)
880{
881 if (!(block->b_flags & B_GOT_CALLBACK))
882 block->b_flags |= B_TIMED_OUT;
883 nlmsvc_insert_block(block, NLM_TIMEOUT);
884 dprintk("revisit block %p flags %d\n", block, block->b_flags);
885 if (block->b_deferred_req) {
886 block->b_deferred_req->revisit(block->b_deferred_req, 0);
887 block->b_deferred_req = NULL;
888 }
889}
890
891
892
893
894
895
896unsigned long
897nlmsvc_retry_blocked(void)
898{
899 unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
900 struct nlm_block *block;
901
902 while (!list_empty(&nlm_blocked) && !kthread_should_stop()) {
903 block = list_entry(nlm_blocked.next, struct nlm_block, b_list);
904
905 if (block->b_when == NLM_NEVER)
906 break;
907 if (time_after(block->b_when, jiffies)) {
908 timeout = block->b_when - jiffies;
909 break;
910 }
911
912 dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
913 block, block->b_when);
914 if (block->b_flags & B_QUEUED) {
915 dprintk("nlmsvc_retry_blocked delete block (%p, granted=%d, flags=%d)\n",
916 block, block->b_granted, block->b_flags);
917 retry_deferred_block(block);
918 } else
919 nlmsvc_grant_blocked(block);
920 }
921
922 return timeout;
923}
924