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24#include <linux/types.h>
25#include <linux/slab.h>
26#include <linux/errno.h>
27#include <linux/kernel.h>
28#include <linux/sched.h>
29#include <linux/sunrpc/clnt.h>
30#include <linux/sunrpc/svc_xprt.h>
31#include <linux/lockd/nlm.h>
32#include <linux/lockd/lockd.h>
33#include <linux/kthread.h>
34
35#define NLMDBG_FACILITY NLMDBG_SVCLOCK
36
37#ifdef CONFIG_LOCKD_V4
38#define nlm_deadlock nlm4_deadlock
39#else
40#define nlm_deadlock nlm_lck_denied
41#endif
42
43static void nlmsvc_release_block(struct nlm_block *block);
44static void nlmsvc_insert_block(struct nlm_block *block, unsigned long);
45static void nlmsvc_remove_block(struct nlm_block *block);
46
47static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock);
48static void nlmsvc_freegrantargs(struct nlm_rqst *call);
49static const struct rpc_call_ops nlmsvc_grant_ops;
50
51
52
53
54static LIST_HEAD(nlm_blocked);
55static DEFINE_SPINLOCK(nlm_blocked_lock);
56
57#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
58static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie)
59{
60
61
62
63
64 static char buf[2*NLM_MAXCOOKIELEN+1];
65 unsigned int i, len = sizeof(buf);
66 char *p = buf;
67
68 len--;
69 if (len < 3)
70 return "???";
71 for (i = 0 ; i < cookie->len ; i++) {
72 if (len < 2) {
73 strcpy(p-3, "...");
74 break;
75 }
76 sprintf(p, "%02x", cookie->data[i]);
77 p += 2;
78 len -= 2;
79 }
80 *p = '\0';
81
82 return buf;
83}
84#endif
85
86
87
88
89static void
90nlmsvc_insert_block_locked(struct nlm_block *block, unsigned long when)
91{
92 struct nlm_block *b;
93 struct list_head *pos;
94
95 dprintk("lockd: nlmsvc_insert_block(%p, %ld)\n", block, when);
96 if (list_empty(&block->b_list)) {
97 kref_get(&block->b_count);
98 } else {
99 list_del_init(&block->b_list);
100 }
101
102 pos = &nlm_blocked;
103 if (when != NLM_NEVER) {
104 if ((when += jiffies) == NLM_NEVER)
105 when ++;
106 list_for_each(pos, &nlm_blocked) {
107 b = list_entry(pos, struct nlm_block, b_list);
108 if (time_after(b->b_when,when) || b->b_when == NLM_NEVER)
109 break;
110 }
111
112
113
114 }
115
116 list_add_tail(&block->b_list, pos);
117 block->b_when = when;
118}
119
120static void nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
121{
122 spin_lock(&nlm_blocked_lock);
123 nlmsvc_insert_block_locked(block, when);
124 spin_unlock(&nlm_blocked_lock);
125}
126
127
128
129
130static inline void
131nlmsvc_remove_block(struct nlm_block *block)
132{
133 if (!list_empty(&block->b_list)) {
134 spin_lock(&nlm_blocked_lock);
135 list_del_init(&block->b_list);
136 spin_unlock(&nlm_blocked_lock);
137 nlmsvc_release_block(block);
138 }
139}
140
141
142
143
144static struct nlm_block *
145nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock)
146{
147 struct nlm_block *block;
148 struct file_lock *fl;
149
150 dprintk("lockd: nlmsvc_lookup_block f=%p pd=%d %Ld-%Ld ty=%d\n",
151 file, lock->fl.fl_pid,
152 (long long)lock->fl.fl_start,
153 (long long)lock->fl.fl_end, lock->fl.fl_type);
154 list_for_each_entry(block, &nlm_blocked, b_list) {
155 fl = &block->b_call->a_args.lock.fl;
156 dprintk("lockd: check f=%p pd=%d %Ld-%Ld ty=%d cookie=%s\n",
157 block->b_file, fl->fl_pid,
158 (long long)fl->fl_start,
159 (long long)fl->fl_end, fl->fl_type,
160 nlmdbg_cookie2a(&block->b_call->a_args.cookie));
161 if (block->b_file == file && nlm_compare_locks(fl, &lock->fl)) {
162 kref_get(&block->b_count);
163 return block;
164 }
165 }
166
167 return NULL;
168}
169
170static inline int nlm_cookie_match(struct nlm_cookie *a, struct nlm_cookie *b)
171{
172 if (a->len != b->len)
173 return 0;
174 if (memcmp(a->data, b->data, a->len))
175 return 0;
176 return 1;
177}
178
179
180
181
182static inline struct nlm_block *
183nlmsvc_find_block(struct nlm_cookie *cookie)
184{
185 struct nlm_block *block;
186
187 list_for_each_entry(block, &nlm_blocked, b_list) {
188 if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie))
189 goto found;
190 }
191
192 return NULL;
193
194found:
195 dprintk("nlmsvc_find_block(%s): block=%p\n", nlmdbg_cookie2a(cookie), block);
196 kref_get(&block->b_count);
197 return block;
198}
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215static struct nlm_block *
216nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_host *host,
217 struct nlm_file *file, struct nlm_lock *lock,
218 struct nlm_cookie *cookie)
219{
220 struct nlm_block *block;
221 struct nlm_rqst *call = NULL;
222
223 call = nlm_alloc_call(host);
224 if (call == NULL)
225 return NULL;
226
227
228 block = kzalloc(sizeof(*block), GFP_KERNEL);
229 if (block == NULL)
230 goto failed;
231 kref_init(&block->b_count);
232 INIT_LIST_HEAD(&block->b_list);
233 INIT_LIST_HEAD(&block->b_flist);
234
235 if (!nlmsvc_setgrantargs(call, lock))
236 goto failed_free;
237
238
239 call->a_args.lock.fl.fl_flags |= FL_SLEEP;
240 call->a_args.lock.fl.fl_lmops = &nlmsvc_lock_operations;
241 nlmclnt_next_cookie(&call->a_args.cookie);
242
243 dprintk("lockd: created block %p...\n", block);
244
245
246 block->b_daemon = rqstp->rq_server;
247 block->b_host = host;
248 block->b_file = file;
249 file->f_count++;
250
251
252 list_add(&block->b_flist, &file->f_blocks);
253
254
255 block->b_call = call;
256 call->a_flags = RPC_TASK_ASYNC;
257 call->a_block = block;
258
259 return block;
260
261failed_free:
262 kfree(block);
263failed:
264 nlmsvc_release_call(call);
265 return NULL;
266}
267
268
269
270
271
272
273static int nlmsvc_unlink_block(struct nlm_block *block)
274{
275 int status;
276 dprintk("lockd: unlinking block %p...\n", block);
277
278
279 status = locks_delete_block(&block->b_call->a_args.lock.fl);
280 nlmsvc_remove_block(block);
281 return status;
282}
283
284static void nlmsvc_free_block(struct kref *kref)
285{
286 struct nlm_block *block = container_of(kref, struct nlm_block, b_count);
287 struct nlm_file *file = block->b_file;
288
289 dprintk("lockd: freeing block %p...\n", block);
290
291
292 list_del_init(&block->b_flist);
293 mutex_unlock(&file->f_mutex);
294
295 nlmsvc_freegrantargs(block->b_call);
296 nlmsvc_release_call(block->b_call);
297 nlm_release_file(block->b_file);
298 kfree(block);
299}
300
301static void nlmsvc_release_block(struct nlm_block *block)
302{
303 if (block != NULL)
304 kref_put_mutex(&block->b_count, nlmsvc_free_block, &block->b_file->f_mutex);
305}
306
307
308
309
310
311void nlmsvc_traverse_blocks(struct nlm_host *host,
312 struct nlm_file *file,
313 nlm_host_match_fn_t match)
314{
315 struct nlm_block *block, *next;
316
317restart:
318 mutex_lock(&file->f_mutex);
319 list_for_each_entry_safe(block, next, &file->f_blocks, b_flist) {
320 if (!match(block->b_host, host))
321 continue;
322
323
324 if (list_empty(&block->b_list))
325 continue;
326 kref_get(&block->b_count);
327 mutex_unlock(&file->f_mutex);
328 nlmsvc_unlink_block(block);
329 nlmsvc_release_block(block);
330 goto restart;
331 }
332 mutex_unlock(&file->f_mutex);
333}
334
335static struct nlm_lockowner *
336nlmsvc_get_lockowner(struct nlm_lockowner *lockowner)
337{
338 refcount_inc(&lockowner->count);
339 return lockowner;
340}
341
342static void nlmsvc_put_lockowner(struct nlm_lockowner *lockowner)
343{
344 if (!refcount_dec_and_lock(&lockowner->count, &lockowner->host->h_lock))
345 return;
346 list_del(&lockowner->list);
347 spin_unlock(&lockowner->host->h_lock);
348 nlmsvc_release_host(lockowner->host);
349 kfree(lockowner);
350}
351
352static struct nlm_lockowner *__nlmsvc_find_lockowner(struct nlm_host *host, pid_t pid)
353{
354 struct nlm_lockowner *lockowner;
355 list_for_each_entry(lockowner, &host->h_lockowners, list) {
356 if (lockowner->pid != pid)
357 continue;
358 return nlmsvc_get_lockowner(lockowner);
359 }
360 return NULL;
361}
362
363static struct nlm_lockowner *nlmsvc_find_lockowner(struct nlm_host *host, pid_t pid)
364{
365 struct nlm_lockowner *res, *new = NULL;
366
367 spin_lock(&host->h_lock);
368 res = __nlmsvc_find_lockowner(host, pid);
369
370 if (res == NULL) {
371 spin_unlock(&host->h_lock);
372 new = kmalloc(sizeof(*res), GFP_KERNEL);
373 spin_lock(&host->h_lock);
374 res = __nlmsvc_find_lockowner(host, pid);
375 if (res == NULL && new != NULL) {
376 res = new;
377
378 refcount_set(&new->count, 1);
379 new->pid = pid;
380 new->host = nlm_get_host(host);
381 list_add(&new->list, &host->h_lockowners);
382 new = NULL;
383 }
384 }
385
386 spin_unlock(&host->h_lock);
387 kfree(new);
388 return res;
389}
390
391void
392nlmsvc_release_lockowner(struct nlm_lock *lock)
393{
394 if (lock->fl.fl_owner)
395 nlmsvc_put_lockowner(lock->fl.fl_owner);
396}
397
398static void nlmsvc_locks_copy_lock(struct file_lock *new, struct file_lock *fl)
399{
400 struct nlm_lockowner *nlm_lo = (struct nlm_lockowner *)fl->fl_owner;
401 new->fl_owner = nlmsvc_get_lockowner(nlm_lo);
402}
403
404static void nlmsvc_locks_release_private(struct file_lock *fl)
405{
406 nlmsvc_put_lockowner((struct nlm_lockowner *)fl->fl_owner);
407}
408
409static const struct file_lock_operations nlmsvc_lock_ops = {
410 .fl_copy_lock = nlmsvc_locks_copy_lock,
411 .fl_release_private = nlmsvc_locks_release_private,
412};
413
414void nlmsvc_locks_init_private(struct file_lock *fl, struct nlm_host *host,
415 pid_t pid)
416{
417 fl->fl_owner = nlmsvc_find_lockowner(host, pid);
418 if (fl->fl_owner != NULL)
419 fl->fl_ops = &nlmsvc_lock_ops;
420}
421
422
423
424
425
426static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock)
427{
428 locks_copy_lock(&call->a_args.lock.fl, &lock->fl);
429 memcpy(&call->a_args.lock.fh, &lock->fh, sizeof(call->a_args.lock.fh));
430 call->a_args.lock.caller = utsname()->nodename;
431 call->a_args.lock.oh.len = lock->oh.len;
432
433
434 call->a_args.lock.oh.data = call->a_owner;
435 call->a_args.lock.svid = ((struct nlm_lockowner *)lock->fl.fl_owner)->pid;
436
437 if (lock->oh.len > NLMCLNT_OHSIZE) {
438 void *data = kmalloc(lock->oh.len, GFP_KERNEL);
439 if (!data)
440 return 0;
441 call->a_args.lock.oh.data = (u8 *) data;
442 }
443
444 memcpy(call->a_args.lock.oh.data, lock->oh.data, lock->oh.len);
445 return 1;
446}
447
448static void nlmsvc_freegrantargs(struct nlm_rqst *call)
449{
450 if (call->a_args.lock.oh.data != call->a_owner)
451 kfree(call->a_args.lock.oh.data);
452
453 locks_release_private(&call->a_args.lock.fl);
454}
455
456
457
458
459static __be32
460nlmsvc_defer_lock_rqst(struct svc_rqst *rqstp, struct nlm_block *block)
461{
462 __be32 status = nlm_lck_denied_nolocks;
463
464 block->b_flags |= B_QUEUED;
465
466 nlmsvc_insert_block(block, NLM_TIMEOUT);
467
468 block->b_cache_req = &rqstp->rq_chandle;
469 if (rqstp->rq_chandle.defer) {
470 block->b_deferred_req =
471 rqstp->rq_chandle.defer(block->b_cache_req);
472 if (block->b_deferred_req != NULL)
473 status = nlm_drop_reply;
474 }
475 dprintk("lockd: nlmsvc_defer_lock_rqst block %p flags %d status %d\n",
476 block, block->b_flags, ntohl(status));
477
478 return status;
479}
480
481
482
483
484
485__be32
486nlmsvc_lock(struct svc_rqst *rqstp, struct nlm_file *file,
487 struct nlm_host *host, struct nlm_lock *lock, int wait,
488 struct nlm_cookie *cookie, int reclaim)
489{
490 struct nlm_block *block = NULL;
491 int error;
492 __be32 ret;
493
494 dprintk("lockd: nlmsvc_lock(%s/%ld, ty=%d, pi=%d, %Ld-%Ld, bl=%d)\n",
495 locks_inode(file->f_file)->i_sb->s_id,
496 locks_inode(file->f_file)->i_ino,
497 lock->fl.fl_type, lock->fl.fl_pid,
498 (long long)lock->fl.fl_start,
499 (long long)lock->fl.fl_end,
500 wait);
501
502
503 mutex_lock(&file->f_mutex);
504
505
506
507 block = nlmsvc_lookup_block(file, lock);
508 if (block == NULL) {
509 block = nlmsvc_create_block(rqstp, host, file, lock, cookie);
510 ret = nlm_lck_denied_nolocks;
511 if (block == NULL)
512 goto out;
513 lock = &block->b_call->a_args.lock;
514 } else
515 lock->fl.fl_flags &= ~FL_SLEEP;
516
517 if (block->b_flags & B_QUEUED) {
518 dprintk("lockd: nlmsvc_lock deferred block %p flags %d\n",
519 block, block->b_flags);
520 if (block->b_granted) {
521 nlmsvc_unlink_block(block);
522 ret = nlm_granted;
523 goto out;
524 }
525 if (block->b_flags & B_TIMED_OUT) {
526 nlmsvc_unlink_block(block);
527 ret = nlm_lck_denied;
528 goto out;
529 }
530 ret = nlm_drop_reply;
531 goto out;
532 }
533
534 if (locks_in_grace(SVC_NET(rqstp)) && !reclaim) {
535 ret = nlm_lck_denied_grace_period;
536 goto out;
537 }
538 if (reclaim && !locks_in_grace(SVC_NET(rqstp))) {
539 ret = nlm_lck_denied_grace_period;
540 goto out;
541 }
542
543 if (!wait)
544 lock->fl.fl_flags &= ~FL_SLEEP;
545 error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
546 lock->fl.fl_flags &= ~FL_SLEEP;
547
548 dprintk("lockd: vfs_lock_file returned %d\n", error);
549 switch (error) {
550 case 0:
551 ret = nlm_granted;
552 goto out;
553 case -EAGAIN:
554
555
556
557
558
559 if (wait)
560 break;
561 ret = nlm_lck_denied;
562 goto out;
563 case FILE_LOCK_DEFERRED:
564 if (wait)
565 break;
566
567
568 ret = nlmsvc_defer_lock_rqst(rqstp, block);
569 goto out;
570 case -EDEADLK:
571 ret = nlm_deadlock;
572 goto out;
573 default:
574 ret = nlm_lck_denied_nolocks;
575 goto out;
576 }
577
578 ret = nlm_lck_blocked;
579
580
581 nlmsvc_insert_block(block, NLM_NEVER);
582out:
583 mutex_unlock(&file->f_mutex);
584 nlmsvc_release_block(block);
585 dprintk("lockd: nlmsvc_lock returned %u\n", ret);
586 return ret;
587}
588
589
590
591
592__be32
593nlmsvc_testlock(struct svc_rqst *rqstp, struct nlm_file *file,
594 struct nlm_host *host, struct nlm_lock *lock,
595 struct nlm_lock *conflock, struct nlm_cookie *cookie)
596{
597 int error;
598 __be32 ret;
599 struct nlm_lockowner *test_owner;
600
601 dprintk("lockd: nlmsvc_testlock(%s/%ld, ty=%d, %Ld-%Ld)\n",
602 locks_inode(file->f_file)->i_sb->s_id,
603 locks_inode(file->f_file)->i_ino,
604 lock->fl.fl_type,
605 (long long)lock->fl.fl_start,
606 (long long)lock->fl.fl_end);
607
608 if (locks_in_grace(SVC_NET(rqstp))) {
609 ret = nlm_lck_denied_grace_period;
610 goto out;
611 }
612
613
614 test_owner = (struct nlm_lockowner *)lock->fl.fl_owner;
615
616 error = vfs_test_lock(file->f_file, &lock->fl);
617 if (error) {
618
619 if (error == FILE_LOCK_DEFERRED)
620 WARN_ON_ONCE(1);
621
622 ret = nlm_lck_denied_nolocks;
623 goto out;
624 }
625
626 if (lock->fl.fl_type == F_UNLCK) {
627 ret = nlm_granted;
628 goto out;
629 }
630
631 dprintk("lockd: conflicting lock(ty=%d, %Ld-%Ld)\n",
632 lock->fl.fl_type, (long long)lock->fl.fl_start,
633 (long long)lock->fl.fl_end);
634 conflock->caller = "somehost";
635 conflock->len = strlen(conflock->caller);
636 conflock->oh.len = 0;
637 conflock->svid = ((struct nlm_lockowner *)lock->fl.fl_owner)->pid;
638 conflock->fl.fl_type = lock->fl.fl_type;
639 conflock->fl.fl_start = lock->fl.fl_start;
640 conflock->fl.fl_end = lock->fl.fl_end;
641 locks_release_private(&lock->fl);
642
643
644 lock->fl.fl_owner = NULL;
645 nlmsvc_put_lockowner(test_owner);
646
647 ret = nlm_lck_denied;
648out:
649 return ret;
650}
651
652
653
654
655
656
657
658
659__be32
660nlmsvc_unlock(struct net *net, struct nlm_file *file, struct nlm_lock *lock)
661{
662 int error;
663
664 dprintk("lockd: nlmsvc_unlock(%s/%ld, pi=%d, %Ld-%Ld)\n",
665 locks_inode(file->f_file)->i_sb->s_id,
666 locks_inode(file->f_file)->i_ino,
667 lock->fl.fl_pid,
668 (long long)lock->fl.fl_start,
669 (long long)lock->fl.fl_end);
670
671
672 nlmsvc_cancel_blocked(net, file, lock);
673
674 lock->fl.fl_type = F_UNLCK;
675 error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
676
677 return (error < 0)? nlm_lck_denied_nolocks : nlm_granted;
678}
679
680
681
682
683
684
685
686
687__be32
688nlmsvc_cancel_blocked(struct net *net, struct nlm_file *file, struct nlm_lock *lock)
689{
690 struct nlm_block *block;
691 int status = 0;
692
693 dprintk("lockd: nlmsvc_cancel(%s/%ld, pi=%d, %Ld-%Ld)\n",
694 locks_inode(file->f_file)->i_sb->s_id,
695 locks_inode(file->f_file)->i_ino,
696 lock->fl.fl_pid,
697 (long long)lock->fl.fl_start,
698 (long long)lock->fl.fl_end);
699
700 if (locks_in_grace(net))
701 return nlm_lck_denied_grace_period;
702
703 mutex_lock(&file->f_mutex);
704 block = nlmsvc_lookup_block(file, lock);
705 mutex_unlock(&file->f_mutex);
706 if (block != NULL) {
707 vfs_cancel_lock(block->b_file->f_file,
708 &block->b_call->a_args.lock.fl);
709 status = nlmsvc_unlink_block(block);
710 nlmsvc_release_block(block);
711 }
712 return status ? nlm_lck_denied : nlm_granted;
713}
714
715
716
717
718
719
720
721
722
723
724static void
725nlmsvc_update_deferred_block(struct nlm_block *block, int result)
726{
727 block->b_flags |= B_GOT_CALLBACK;
728 if (result == 0)
729 block->b_granted = 1;
730 else
731 block->b_flags |= B_TIMED_OUT;
732}
733
734static int nlmsvc_grant_deferred(struct file_lock *fl, int result)
735{
736 struct nlm_block *block;
737 int rc = -ENOENT;
738
739 spin_lock(&nlm_blocked_lock);
740 list_for_each_entry(block, &nlm_blocked, b_list) {
741 if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
742 dprintk("lockd: nlmsvc_notify_blocked block %p flags %d\n",
743 block, block->b_flags);
744 if (block->b_flags & B_QUEUED) {
745 if (block->b_flags & B_TIMED_OUT) {
746 rc = -ENOLCK;
747 break;
748 }
749 nlmsvc_update_deferred_block(block, result);
750 } else if (result == 0)
751 block->b_granted = 1;
752
753 nlmsvc_insert_block_locked(block, 0);
754 svc_wake_up(block->b_daemon);
755 rc = 0;
756 break;
757 }
758 }
759 spin_unlock(&nlm_blocked_lock);
760 if (rc == -ENOENT)
761 printk(KERN_WARNING "lockd: grant for unknown block\n");
762 return rc;
763}
764
765
766
767
768
769
770
771
772static void
773nlmsvc_notify_blocked(struct file_lock *fl)
774{
775 struct nlm_block *block;
776
777 dprintk("lockd: VFS unblock notification for block %p\n", fl);
778 spin_lock(&nlm_blocked_lock);
779 list_for_each_entry(block, &nlm_blocked, b_list) {
780 if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
781 nlmsvc_insert_block_locked(block, 0);
782 spin_unlock(&nlm_blocked_lock);
783 svc_wake_up(block->b_daemon);
784 return;
785 }
786 }
787 spin_unlock(&nlm_blocked_lock);
788 printk(KERN_WARNING "lockd: notification for unknown block!\n");
789}
790
791const struct lock_manager_operations nlmsvc_lock_operations = {
792 .lm_notify = nlmsvc_notify_blocked,
793 .lm_grant = nlmsvc_grant_deferred,
794};
795
796
797
798
799
800
801
802
803
804
805
806
807static void
808nlmsvc_grant_blocked(struct nlm_block *block)
809{
810 struct nlm_file *file = block->b_file;
811 struct nlm_lock *lock = &block->b_call->a_args.lock;
812 int error;
813 loff_t fl_start, fl_end;
814
815 dprintk("lockd: grant blocked lock %p\n", block);
816
817 kref_get(&block->b_count);
818
819
820 nlmsvc_unlink_block(block);
821
822
823
824
825 if (block->b_granted) {
826 nlm_rebind_host(block->b_host);
827 goto callback;
828 }
829
830
831
832
833
834 lock->fl.fl_flags |= FL_SLEEP;
835 fl_start = lock->fl.fl_start;
836 fl_end = lock->fl.fl_end;
837 error = vfs_lock_file(file->f_file, F_SETLK, &lock->fl, NULL);
838 lock->fl.fl_flags &= ~FL_SLEEP;
839 lock->fl.fl_start = fl_start;
840 lock->fl.fl_end = fl_end;
841
842 switch (error) {
843 case 0:
844 break;
845 case FILE_LOCK_DEFERRED:
846 dprintk("lockd: lock still blocked error %d\n", error);
847 nlmsvc_insert_block(block, NLM_NEVER);
848 nlmsvc_release_block(block);
849 return;
850 default:
851 printk(KERN_WARNING "lockd: unexpected error %d in %s!\n",
852 -error, __func__);
853 nlmsvc_insert_block(block, 10 * HZ);
854 nlmsvc_release_block(block);
855 return;
856 }
857
858callback:
859
860 dprintk("lockd: GRANTing blocked lock.\n");
861 block->b_granted = 1;
862
863
864
865
866 nlmsvc_insert_block(block, NLM_NEVER);
867
868
869
870
871 error = nlm_async_call(block->b_call, NLMPROC_GRANTED_MSG,
872 &nlmsvc_grant_ops);
873
874
875 if (error < 0)
876 nlmsvc_insert_block(block, 10 * HZ);
877}
878
879
880
881
882
883
884
885
886
887static void nlmsvc_grant_callback(struct rpc_task *task, void *data)
888{
889 struct nlm_rqst *call = data;
890 struct nlm_block *block = call->a_block;
891 unsigned long timeout;
892
893 dprintk("lockd: GRANT_MSG RPC callback\n");
894
895 spin_lock(&nlm_blocked_lock);
896
897
898
899
900
901
902
903
904 if (list_empty(&block->b_list))
905 goto out;
906
907
908
909
910 if (task->tk_status < 0) {
911
912 timeout = 10 * HZ;
913 } else {
914
915 timeout = 60 * HZ;
916 }
917 nlmsvc_insert_block_locked(block, timeout);
918 svc_wake_up(block->b_daemon);
919out:
920 spin_unlock(&nlm_blocked_lock);
921}
922
923
924
925
926
927static void nlmsvc_grant_release(void *data)
928{
929 struct nlm_rqst *call = data;
930 nlmsvc_release_block(call->a_block);
931}
932
933static const struct rpc_call_ops nlmsvc_grant_ops = {
934 .rpc_call_done = nlmsvc_grant_callback,
935 .rpc_release = nlmsvc_grant_release,
936};
937
938
939
940
941
942void
943nlmsvc_grant_reply(struct nlm_cookie *cookie, __be32 status)
944{
945 struct nlm_block *block;
946
947 dprintk("grant_reply: looking for cookie %x, s=%d \n",
948 *(unsigned int *)(cookie->data), status);
949 if (!(block = nlmsvc_find_block(cookie)))
950 return;
951
952 if (status == nlm_lck_denied_grace_period) {
953
954 nlmsvc_insert_block(block, 10 * HZ);
955 } else {
956
957
958
959
960 nlmsvc_unlink_block(block);
961 }
962 nlmsvc_release_block(block);
963}
964
965
966
967
968
969static void
970retry_deferred_block(struct nlm_block *block)
971{
972 if (!(block->b_flags & B_GOT_CALLBACK))
973 block->b_flags |= B_TIMED_OUT;
974 nlmsvc_insert_block(block, NLM_TIMEOUT);
975 dprintk("revisit block %p flags %d\n", block, block->b_flags);
976 if (block->b_deferred_req) {
977 block->b_deferred_req->revisit(block->b_deferred_req, 0);
978 block->b_deferred_req = NULL;
979 }
980}
981
982
983
984
985
986
987unsigned long
988nlmsvc_retry_blocked(void)
989{
990 unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
991 struct nlm_block *block;
992
993 spin_lock(&nlm_blocked_lock);
994 while (!list_empty(&nlm_blocked) && !kthread_should_stop()) {
995 block = list_entry(nlm_blocked.next, struct nlm_block, b_list);
996
997 if (block->b_when == NLM_NEVER)
998 break;
999 if (time_after(block->b_when, jiffies)) {
1000 timeout = block->b_when - jiffies;
1001 break;
1002 }
1003 spin_unlock(&nlm_blocked_lock);
1004
1005 dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
1006 block, block->b_when);
1007 if (block->b_flags & B_QUEUED) {
1008 dprintk("nlmsvc_retry_blocked delete block (%p, granted=%d, flags=%d)\n",
1009 block, block->b_granted, block->b_flags);
1010 retry_deferred_block(block);
1011 } else
1012 nlmsvc_grant_blocked(block);
1013 spin_lock(&nlm_blocked_lock);
1014 }
1015 spin_unlock(&nlm_blocked_lock);
1016
1017 return timeout;
1018}
1019