summaryrefslogtreecommitdiffstats
path: root/xlators/features/locks/src/posix.c
blob: f2e73b9cb2517aed00e73aee2f0693a3d22f74f3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
/*
  Copyright (c) 2006, 2007, 2008 Gluster, Inc. <http://www.gluster.com>
  This file is part of GlusterFS.

  GlusterFS is free software; you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published
  by the Free Software Foundation; either version 3 of the License,
  or (at your option) any later version.

  GlusterFS is distributed in the hope that it will be useful, but
  WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program.  If not, see
  <http://www.gnu.org/licenses/>.
*/

#include <unistd.h>
#include <fcntl.h>
#include <limits.h>
#include <pthread.h>

#ifndef _CONFIG_H
#define _CONFIG_H
#include "config.h"
#endif

#include "glusterfs.h"
#include "compat.h"
#include "xlator.h"
#include "inode.h"
#include "logging.h"
#include "common-utils.h"

#include "locks.h"
#include "common.h"
#include "statedump.h"

#ifndef LLONG_MAX
#define LLONG_MAX LONG_LONG_MAX /* compat with old gcc */
#endif /* LLONG_MAX */

/* Forward declarations */


void do_blocked_rw (pl_inode_t *);
static int __rw_allowable (pl_inode_t *, posix_lock_t *, glusterfs_fop_t);

struct _truncate_ops {
	loc_t  loc;
	fd_t  *fd;
	off_t  offset;
	enum {TRUNCATE, FTRUNCATE} op;
};


int
pl_truncate_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
		 int32_t op_ret, int32_t op_errno, struct stat *prebuf,
                 struct stat *postbuf)
{
	struct _truncate_ops *local = NULL;

	local = frame->local;

	if (local->op == TRUNCATE)
		loc_wipe (&local->loc);

	STACK_UNWIND_STRICT (truncate, frame, op_ret, op_errno,
                             prebuf, postbuf);
	return 0;
}


static int
truncate_allowed (pl_inode_t *pl_inode, 
		  transport_t *transport, pid_t client_pid, 
		  off_t offset)
{
	posix_lock_t *l = NULL;
	posix_lock_t  region = {.list = {0, }, };
	int           ret = 1;

	region.fl_start   = offset;
	region.fl_end     = LLONG_MAX;
	region.transport  = transport;
	region.client_pid = client_pid;

	pthread_mutex_lock (&pl_inode->mutex);
	{
		list_for_each_entry (l, &pl_inode->ext_list, list) {
			if (!l->blocked
			    && locks_overlap (&region, l)
			    && !same_owner (&region, l)) {
				ret = 0;
				break;
			}
		}
	}
	pthread_mutex_unlock (&pl_inode->mutex);

	return ret;
}


static int
truncate_stat_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
		   int32_t op_ret, int32_t op_errno, struct stat *buf)
{
	posix_locks_private_t *priv = NULL;
	struct _truncate_ops  *local = NULL;
	inode_t               *inode = NULL;
	pl_inode_t            *pl_inode = NULL;


	priv = this->private;
	local = frame->local;

	if (op_ret != 0) {
		gf_log (this->name, GF_LOG_ERROR, 
			"got error (errno=%d, stderror=%s) from child", 
			op_errno, strerror (op_errno));
		goto unwind;
	}

	if (local->op == TRUNCATE)
		inode = local->loc.inode;
	else
		inode = local->fd->inode;

	pl_inode = pl_inode_get (this, inode);
	if (!pl_inode) {
		gf_log (this->name, GF_LOG_ERROR,
			"Out of memory.");
                op_ret   = -1;
		op_errno = ENOMEM;
		goto unwind;
	}

	if (priv->mandatory
	    && pl_inode->mandatory
	    && !truncate_allowed (pl_inode, frame->root->trans,
				  frame->root->pid, local->offset)) {
                op_ret   = -1;
		op_errno = EAGAIN;
		goto unwind;
	}

	switch (local->op) {
	case TRUNCATE:
		STACK_WIND (frame, pl_truncate_cbk, FIRST_CHILD (this),
			    FIRST_CHILD (this)->fops->truncate,
			    &local->loc, local->offset);
		break;
	case FTRUNCATE:
		STACK_WIND (frame, pl_truncate_cbk, FIRST_CHILD (this),
			    FIRST_CHILD (this)->fops->ftruncate,
			    local->fd, local->offset);
		break;
	}

	return 0;

unwind:
	if (local->op == TRUNCATE)
		loc_wipe (&local->loc);

	STACK_UNWIND_STRICT (truncate, frame, op_ret, op_errno, buf, NULL);
	return 0;
}


int
pl_truncate (call_frame_t *frame, xlator_t *this,
	     loc_t *loc, off_t offset)
{
	struct _truncate_ops *local = NULL;

	local = CALLOC (1, sizeof (struct _truncate_ops));
	if (!local) {
		gf_log (this->name, GF_LOG_ERROR,
			"Out of memory.");
		goto unwind;
	}

	local->op         = TRUNCATE;
	local->offset     = offset;
	loc_copy (&local->loc, loc);

	frame->local = local;

	STACK_WIND (frame, truncate_stat_cbk, FIRST_CHILD (this),
		    FIRST_CHILD (this)->fops->stat, loc);

	return 0;

unwind:
	STACK_UNWIND_STRICT (truncate, frame, -1, ENOMEM, NULL, NULL);

	return 0;
}


int
pl_ftruncate (call_frame_t *frame, xlator_t *this,
	      fd_t *fd, off_t offset)
{
	struct _truncate_ops *local = NULL;

	local = CALLOC (1, sizeof (struct _truncate_ops));
	if (!local) {
		gf_log (this->name, GF_LOG_ERROR,
			"Out of memory.");
		goto unwind;
	}

	local->op         = FTRUNCATE;
	local->offset     = offset;
	local->fd         = fd;

	frame->local = local;

	STACK_WIND (frame, truncate_stat_cbk, FIRST_CHILD(this),
		    FIRST_CHILD(this)->fops->fstat, fd);
	return 0;

unwind:
	STACK_UNWIND_STRICT (ftruncate, frame, -1, ENOMEM, NULL, NULL);

	return 0;
}


static void
__delete_locks_of_owner (pl_inode_t *pl_inode,
			 transport_t *transport, pid_t pid)
{
	posix_lock_t *tmp = NULL;
	posix_lock_t *l = NULL;

	/* TODO: what if it is a blocked lock with pending l->frame */

	list_for_each_entry_safe (l, tmp, &pl_inode->ext_list, list) {
		if ((l->transport == transport)
		    && (l->client_pid == pid)) {
			__delete_lock (pl_inode, l);
			__destroy_lock (l);
		}
	}

	return;
}


int
pl_flush_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
	      int32_t op_ret, int32_t op_errno)
{
	STACK_UNWIND_STRICT (flush, frame, op_ret, op_errno);

	return 0;
}


int
pl_flush (call_frame_t *frame, xlator_t *this,
	  fd_t *fd)
{
	posix_locks_private_t *priv = NULL;
	pl_inode_t            *pl_inode = NULL;

	priv = this->private;

	pl_inode = pl_inode_get (this, fd->inode);

	if (!pl_inode) {
		gf_log (this->name, GF_LOG_DEBUG, "Could not get inode.");
		STACK_UNWIND_STRICT (flush, frame, -1, EBADFD);
		return 0;
	}

	pthread_mutex_lock (&pl_inode->mutex);
	{
		__delete_locks_of_owner (pl_inode, frame->root->trans,
					 frame->root->pid);
	}
	pthread_mutex_unlock (&pl_inode->mutex);

	grant_blocked_locks (this, pl_inode);

	do_blocked_rw (pl_inode);

	STACK_WIND (frame, pl_flush_cbk, FIRST_CHILD(this),
		    FIRST_CHILD(this)->fops->flush, fd);
	return 0;
}


int
pl_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
	     int32_t op_ret, int32_t op_errno, fd_t *fd)
{
	STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd);

	return 0;
}


int
pl_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
         fd_t *fd, int32_t wbflags)
{
	/* why isn't O_TRUNC being handled ? */
	STACK_WIND (frame, pl_open_cbk, 
		    FIRST_CHILD(this), FIRST_CHILD(this)->fops->open, 
		    loc, flags & ~O_TRUNC, fd, wbflags);

	return 0;
}


int
pl_create_cbk (call_frame_t *frame, void *cookie,
	       xlator_t *this, int32_t op_ret, int32_t op_errno,
	       fd_t *fd, inode_t *inode, struct stat *buf,
               struct stat *preparent, struct stat *postparent)
{
	STACK_UNWIND_STRICT (create, frame, op_ret, op_errno, fd, inode, buf,
                             preparent, postparent);

	return 0;
}


int
pl_create (call_frame_t *frame, xlator_t *this,
	   loc_t *loc, int32_t flags, mode_t mode, fd_t *fd)
{
	STACK_WIND (frame, pl_create_cbk,
		    FIRST_CHILD (this), FIRST_CHILD (this)->fops->create, 
		    loc, flags, mode, fd);
	return 0;
}


int
pl_readv_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
	      int32_t op_ret, int32_t op_errno,
	      struct iovec *vector, int32_t count, struct stat *stbuf,
              struct iobref *iobref)
{
	STACK_UNWIND_STRICT (readv, frame, op_ret, op_errno,
                             vector, count, stbuf, iobref);

	return 0;
}

int
pl_writev_cbk (call_frame_t *frame, void *cookie, xlator_t *this, 
	       int32_t op_ret, int32_t op_errno, struct stat *prebuf,
               struct stat *postbuf)
{
	STACK_UNWIND_STRICT (writev, frame, op_ret, op_errno, prebuf, postbuf);

	return 0;
}


void
do_blocked_rw (pl_inode_t *pl_inode)
{
	struct list_head  wind_list;
	pl_rw_req_t      *rw = NULL;
	pl_rw_req_t      *tmp = NULL;

	INIT_LIST_HEAD (&wind_list);

	pthread_mutex_lock (&pl_inode->mutex);
	{
		list_for_each_entry_safe (rw, tmp, &pl_inode->rw_list, list) {
			if (__rw_allowable (pl_inode, &rw->region,
					    rw->stub->fop)) {
				list_del_init (&rw->list);
				list_add_tail (&rw->list, &wind_list);
			}
		}
	}
	pthread_mutex_unlock (&pl_inode->mutex);

	list_for_each_entry_safe (rw, tmp, &wind_list, list) {
		list_del_init (&rw->list);
		call_resume (rw->stub);
		free (rw);
	}

	return;
}


static int
__rw_allowable (pl_inode_t *pl_inode, posix_lock_t *region,
		glusterfs_fop_t op)
{
	posix_lock_t *l = NULL;
	int           ret = 1;

	list_for_each_entry (l, &pl_inode->ext_list, list) {
		if (locks_overlap (l, region) && !same_owner (l, region)) {
			if ((op == GF_FOP_READ) && (l->fl_type != F_WRLCK))
				continue;
			ret = 0;
			break;
		}
	}

	return ret;
}


int
pl_readv_cont (call_frame_t *frame, xlator_t *this,
	       fd_t *fd, size_t size, off_t offset)
{
	STACK_WIND (frame, pl_readv_cbk,
		    FIRST_CHILD (this), FIRST_CHILD (this)->fops->readv,
		    fd, size, offset);

	return 0;
}


int
pl_readv (call_frame_t *frame, xlator_t *this,
	  fd_t *fd, size_t size, off_t offset)
{
	posix_locks_private_t *priv = NULL;
	pl_inode_t            *pl_inode = NULL;
	pl_rw_req_t           *rw = NULL;
	posix_lock_t           region = {.list = {0, }, };
	int                    op_ret = 0;
	int                    op_errno = 0;
	char                   wind_needed = 1;


	priv = this->private;
	pl_inode = pl_inode_get (this, fd->inode);

	if (priv->mandatory && pl_inode->mandatory) {
		region.fl_start   = offset;
		region.fl_end     = offset + size - 1;
		region.transport  = frame->root->trans;
		region.client_pid = frame->root->pid;
    
		pthread_mutex_lock (&pl_inode->mutex);
		{
			wind_needed = __rw_allowable (pl_inode, &region,
                                                      GF_FOP_READ);
			if (wind_needed) {
				goto unlock;
                        }

			if (fd->flags & O_NONBLOCK) {
				gf_log (this->name, GF_LOG_TRACE,
					"returning EAGAIN as fd is O_NONBLOCK");
				op_errno = EAGAIN;
				op_ret = -1;
				goto unlock;
			}

			rw = CALLOC (1, sizeof (*rw));
			if (!rw) {
				gf_log (this->name, GF_LOG_ERROR,
					"Out of memory.");
				op_errno = ENOMEM;
				op_ret = -1;
				goto unlock;
			}

			rw->stub = fop_readv_stub (frame, pl_readv_cont,
						   fd, size, offset);
			if (!rw->stub) {
				gf_log (this->name, GF_LOG_ERROR,
					"Out of memory.");
				op_errno = ENOMEM;
				op_ret = -1;
				free (rw);
				goto unlock;
			}

			rw->region = region;

			list_add_tail (&rw->list, &pl_inode->rw_list);
		}
	unlock:
		pthread_mutex_unlock (&pl_inode->mutex);
	}


        if (wind_needed) {
                STACK_WIND (frame, pl_readv_cbk, 
                            FIRST_CHILD (this), FIRST_CHILD (this)->fops->readv,
                            fd, size, offset);
        }

	if (op_ret == -1)
		STACK_UNWIND_STRICT (readv, frame, -1, op_errno,
                                     NULL, 0, NULL, NULL);

	return 0;
}


int
pl_writev_cont (call_frame_t *frame, xlator_t *this, fd_t *fd,
		struct iovec *vector, int count, off_t offset,
                struct iobref *iobref)
{
	STACK_WIND (frame, pl_writev_cbk,
		    FIRST_CHILD (this), FIRST_CHILD (this)->fops->writev,
		    fd, vector, count, offset, iobref);

	return 0;
}


int
pl_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
	   struct iovec *vector, int32_t count, off_t offset,
           struct iobref *iobref)
{
	posix_locks_private_t *priv = NULL;
	pl_inode_t            *pl_inode = NULL;
	pl_rw_req_t           *rw = NULL;
	posix_lock_t           region = {.list = {0, }, };
	int                    op_ret = 0;
	int                    op_errno = 0;
	char                   wind_needed = 1;


	priv = this->private;
	pl_inode = pl_inode_get (this, fd->inode);

	if (priv->mandatory && pl_inode->mandatory) {
		region.fl_start   = offset;
		region.fl_end     = offset + iov_length (vector, count) - 1;
		region.transport  = frame->root->trans;
		region.client_pid = frame->root->pid;
    
		pthread_mutex_lock (&pl_inode->mutex);
		{
			wind_needed = __rw_allowable (pl_inode, &region,
                                                      GF_FOP_WRITE);
			if (wind_needed)
				goto unlock;

			if (fd->flags & O_NONBLOCK) {
				gf_log (this->name, GF_LOG_TRACE,
					"returning EAGAIN because fd is "
                                        "O_NONBLOCK");
				op_errno = EAGAIN;
				op_ret = -1;
				goto unlock;
			}

			rw = CALLOC (1, sizeof (*rw));
			if (!rw) {
				gf_log (this->name, GF_LOG_ERROR,
					"Out of memory.");
				op_errno = ENOMEM;
				op_ret = -1;
				goto unlock;
			}

			rw->stub = fop_writev_stub (frame, pl_writev_cont,
						    fd, vector, count, offset,
                                                    iobref);
			if (!rw->stub) {
				gf_log (this->name, GF_LOG_ERROR,
					"Out of memory.");
				op_errno = ENOMEM;
				op_ret = -1;
				free (rw);
				goto unlock;
			}

			rw->region = region;

			list_add_tail (&rw->list, &pl_inode->rw_list);
		}
	unlock:
		pthread_mutex_unlock (&pl_inode->mutex);
	}


        if (wind_needed)
                STACK_WIND (frame, pl_writev_cbk, 
                            FIRST_CHILD (this), FIRST_CHILD (this)->fops->writev,
                            fd, vector, count, offset, iobref);

	if (op_ret == -1)
		STACK_UNWIND_STRICT (writev, frame, -1, op_errno, NULL, NULL);

	return 0;
}


int
pl_lk (call_frame_t *frame, xlator_t *this,
       fd_t *fd, int32_t cmd, struct flock *flock)
{
	transport_t           *transport = NULL;
	pid_t                  client_pid = 0;
	posix_locks_private_t *priv = NULL;
	pl_inode_t            *pl_inode = NULL;
	int                    op_ret = 0;
	int                    op_errno = 0;
	int                    can_block = 0;
	posix_lock_t          *reqlock = NULL;
	posix_lock_t          *conf = NULL;
	int                    ret = 0;

	transport  = frame->root->trans;
	client_pid = frame->root->pid;
	priv       = this->private;

	pl_inode = pl_inode_get (this, fd->inode);
	if (!pl_inode) {
		gf_log (this->name, GF_LOG_ERROR,
			"Out of memory.");
		op_ret = -1;
		op_errno = ENOMEM;
		goto unwind;
	}

	reqlock = new_posix_lock (flock, transport, client_pid);
	if (!reqlock) {
		gf_log (this->name, GF_LOG_ERROR,
			"Out of memory.");
		op_ret = -1;
		op_errno = ENOMEM;
		goto unwind;
	}

	switch (cmd) {

#if F_GETLK != F_GETLK64
	case F_GETLK64:
#endif
	case F_GETLK:
		conf = pl_getlk (pl_inode, reqlock);
		posix_lock_to_flock (conf, flock);
		__destroy_lock (reqlock);

		break;

#if F_SETLKW != F_SETLKW64
	case F_SETLKW64:
#endif
	case F_SETLKW:
		can_block = 1;
		reqlock->frame = frame;
		reqlock->this  = this;
		reqlock->fd    = fd;

		/* fall through */

#if F_SETLK != F_SETLK64
	case F_SETLK64:
#endif
	case F_SETLK:
		memcpy (&reqlock->user_flock, flock, sizeof (struct flock));
		ret = pl_setlk (this, pl_inode, reqlock,
				can_block);

		if (ret == -1) {
			if (can_block)
				goto out;

			gf_log (this->name, GF_LOG_DEBUG, "returning EAGAIN");
			op_ret = -1;
			op_errno = EAGAIN;
			__destroy_lock (reqlock);
		}
	}

unwind:
	STACK_UNWIND_STRICT (lk, frame, op_ret, op_errno, flock);
out:
	return 0;
}


/* TODO: this function just logs, no action required?? */
int
pl_forget (xlator_t *this,
	   inode_t *inode)
{
	pl_inode_t   *pl_inode = NULL;

        posix_lock_t *ext_tmp = NULL;
        posix_lock_t *ext_l   = NULL;

        pl_inode_lock_t *ino_tmp = NULL;
        pl_inode_lock_t *ino_l   = NULL;

        pl_rw_req_t *rw_tmp = NULL;
        pl_rw_req_t *rw_req = NULL;

        pl_entry_lock_t *entry_tmp = NULL;
        pl_entry_lock_t *entry_l   = NULL;

        pl_dom_list_t *dom = NULL;
        pl_dom_list_t *dom_tmp = NULL;

	pl_inode = pl_inode_get (this, inode);

	if (!list_empty (&pl_inode->rw_list)) {
		gf_log (this->name, GF_LOG_DEBUG,
			"Pending R/W requests found, releasing.");

                list_for_each_entry_safe (rw_req, rw_tmp, &pl_inode->rw_list,
                                          list) {

                        list_del (&rw_req->list);
                        FREE (rw_req);
                }
	}

	if (!list_empty (&pl_inode->ext_list)) {
		gf_log (this->name, GF_LOG_DEBUG,
			"Pending fcntl locks found, releasing.");

                list_for_each_entry_safe (ext_l, ext_tmp, &pl_inode->ext_list,
                                          list) {

                        __delete_lock (pl_inode, ext_l);
                        __destroy_lock (ext_l);
                }
	}


        list_for_each_entry_safe (dom, dom_tmp, &pl_inode->dom_list, inode_list) {

                if (!list_empty (&dom->inodelk_list)) {
                        gf_log (this->name, GF_LOG_WARNING,
                                "Pending inode locks found, releasing.");

                        list_for_each_entry_safe (ino_l, ino_tmp, &dom->inodelk_list, list) {
                                __delete_inode_lock (ino_l);
                                grant_blocked_inode_locks (this, pl_inode, ino_l, dom);
                        }

                }
                if (!list_empty (&dom->entrylk_list)) {
                        gf_log (this->name, GF_LOG_WARNING,
                                "Pending entry locks found, releasing.");

                        list_for_each_entry_safe (entry_l, entry_tmp, &dom->entrylk_list, domain_list) {
                                list_del_init (&entry_l->domain_list);
                                grant_blocked_entry_locks (this, pl_inode, entry_l, dom);

                                if (entry_l->basename)
                                        FREE (entry_l->basename);
                                FREE (entry_l);
                        }

                }

                list_del (&dom->inode_list);
                gf_log ("posix-locks", GF_LOG_TRACE,
                        " Cleaning up domain: %s", dom->domain);
                FREE (dom->domain);
                FREE (dom);
        }

        FREE (pl_inode);

	return 0;
}


int32_t
pl_dump_inode_priv (xlator_t *this, inode_t *inode)
{

        int             ret = -1;
        uint64_t        tmp_pl_inode = 0;
        pl_inode_t      *pl_inode = NULL;
        char            key[GF_DUMP_MAX_BUF_LEN];

        if (!inode)
                return -1;

	ret = inode_ctx_get (inode, this, &tmp_pl_inode);

	if (ret != 0) 
                return ret;
                
        pl_inode = (pl_inode_t *)(long)tmp_pl_inode;

        if (!pl_inode) 
                return -1;

        gf_proc_dump_build_key(key, 
                               "xlator.feature.locks.inode",
                               "%ld.mandatory",inode->ino);
        gf_proc_dump_write(key, "%d", pl_inode->mandatory);

        return 0;
}



/*
 * pl_dump_inode - inode dump function for posix locks
 *
 */
int
pl_dump_inode (xlator_t *this)
{

        assert(this);
        
        if (this->itable) {
                inode_table_dump(this->itable,
                                 "xlator.features.locks.inode_table");
        }

	return 0;
}



int
init (xlator_t *this)
{
	posix_locks_private_t *priv = NULL;
	xlator_list_t         *trav = NULL;
	data_t                *mandatory = NULL;

	if (!this->children || this->children->next) {
		gf_log (this->name, GF_LOG_CRITICAL, 
			"FATAL: posix-locks should have exactly one child");
		return -1;
	}

	if (!this->parents) {
		gf_log (this->name, GF_LOG_WARNING,
			"Volume is dangling. Please check the volume file.");
	}

	trav = this->children;
	while (trav->xlator->children)
		trav = trav->xlator->children;

	if (strncmp ("storage/", trav->xlator->type, 8)) {
		gf_log (this->name, GF_LOG_CRITICAL,
			"'locks' translator is not loaded over a storage "
                        "translator");
		return -1;
	}

	priv = CALLOC (1, sizeof (*priv));

	mandatory = dict_get (this->options, "mandatory-locks");
	if (mandatory) {
		if (gf_string2boolean (mandatory->data,
				       &priv->mandatory) == -1) {
			gf_log (this->name, GF_LOG_ERROR,
				"'mandatory-locks' takes on only boolean "
                                "values.");
			return -1;
		}
	}

	this->private = priv;
	return 0;
}


int
fini (xlator_t *this)
{
	posix_locks_private_t *priv = NULL;

	priv = this->private;
	free (priv);

	return 0;
}


int
pl_inodelk (call_frame_t *frame, xlator_t *this, 
	    const char *volume, loc_t *loc, int32_t cmd, struct flock *flock);

int
pl_finodelk (call_frame_t *frame, xlator_t *this, 
	     const char *volume, fd_t *fd, int32_t cmd, struct flock *flock);

int
pl_entrylk (call_frame_t *frame, xlator_t *this, 
	    const char *volume, loc_t *loc, const char *basename, 
	    entrylk_cmd cmd, entrylk_type type);

int
pl_fentrylk (call_frame_t *frame, xlator_t *this, 
	     const char *volume, fd_t *fd, const char *basename, 
	     entrylk_cmd cmd, entrylk_type type);

struct xlator_fops fops = {
	.create      = pl_create,
	.truncate    = pl_truncate,
	.ftruncate   = pl_ftruncate,
	.open        = pl_open,
	.readv       = pl_readv,
	.writev      = pl_writev,
	.lk          = pl_lk,
	.inodelk     = pl_inodelk,
	.finodelk    = pl_finodelk,
	.entrylk     = pl_entrylk,
	.fentrylk    = pl_fentrylk,
	.flush       = pl_flush,
};


struct xlator_mops mops = {
};

struct xlator_dumpops dumpops = {
        .inodectx    = pl_dump_inode_priv,
};

struct xlator_cbks cbks = {
	.forget      = pl_forget,
};


struct volume_options options[] = {
	{ .key  = { "mandatory-locks", "mandatory" }, 
	  .type = GF_OPTION_TYPE_BOOL 
	},
	{ .key = {NULL} },
};