summaryrefslogtreecommitdiffstats
path: root/src/H5M.c
blob: 69ac7cf0e179c454a4ef59bbc52aad64b87df3c4 (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
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/****************/
/* Module Setup */
/****************/

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5M_init_interface


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5ESprivate.h"        /* Event Stacks                         */
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Lprivate.h"		/* Links        		  	*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5VLprivate.h"	/* VOL plugins				*/
#include "H5VLiod_client.h"	/* IOD VOL plugin			*/

#ifdef H5_HAVE_EFF

/****************/
/* Local Macros */
/****************/


/******************/
/* Local Typedefs */
/******************/


/********************/
/* Package Typedefs */
/********************/


/********************/
/* Local Prototypes */
/********************/

static herr_t H5M_close_map(void *map, H5VL_t *vol_plugin);

/*********************/
/* Package Variables */
/*********************/


/*****************************/
/* Library Private Variables */
/*****************************/


/*******************/
/* Local Variables */
/*******************/


/* MAP ID class */
static const H5I_class_t H5I_MAP_CLS[1] = {{
    H5I_MAP,                    /* ID class value */
    0,                          /* Class flags */
    0,                          /* # of reserved IDs for class */
    NULL,                       /* Callback routine for closing objects of this class */
    (H5I_free2_t)H5M_close_map  /* Callback routine for closing auxilary objects of this class */
}};


/*-------------------------------------------------------------------------
 * Function:	H5M_init
 *
 * Purpose:	Initialize the interface from some other package.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5M_init(void)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(FAIL)
    /* FUNC_ENTER() does all the work */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5M_init() */


/*--------------------------------------------------------------------------
NAME
   H5M_init_interface -- Initialize interface-specific information
USAGE
    herr_t H5M_init_interface()

RETURNS
    Non-negative on success/Negative on failure
DESCRIPTION
    Initializes any interface-specific data or routines.

--------------------------------------------------------------------------*/
static herr_t
H5M_init_interface(void)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    /*
     * Create attribute ID type.
     */
    if(H5I_register_type(H5I_MAP_CLS) < 0)
        HGOTO_ERROR(H5E_INTERNAL, H5E_CANTINIT, FAIL, "unable to initialize interface")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5M_init_interface() */


/*--------------------------------------------------------------------------
 NAME
    H5M_term_interface
 PURPOSE
    Terminate various H5M objects
 USAGE
    void H5M_term_interface()
 RETURNS
 DESCRIPTION
    Release any other resources allocated.
 GLOBAL VARIABLES
 COMMENTS, BUGS, ASSUMPTIONS
     Can't report errors...
 EXAMPLES
 REVISION LOG
--------------------------------------------------------------------------*/
int
H5M_term_interface(void)
{
    int	n = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    if(H5_interface_initialize_g) {
	if((n = H5I_nmembers(H5I_MAP))>0) {
	    (void)H5I_clear_type(H5I_MAP, FALSE, FALSE);
	} else {
	    (void)H5I_dec_type_ref(H5I_MAP);
	    H5_interface_initialize_g = 0;
	    n = 1;
	}
    }
    FUNC_LEAVE_NOAPI(n)
} /* H5M_term_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5Mcreate_ff
 *
 * Purpose: 
 *     The H5Mcreate routine creates a new map object named name
 *     at the location given by loc_id.  Map creation and access property
 *     lists (mcpl_id and mapl_id) modify the new map objectÕs behavior.
 *     All keys for the map are of keytype datatype and all values for the
 *     map are of valtype datatype.  The H5Mcreate_ff routine is identical
 *     in functionality, but allows for asynchronous operation and
 *     inclusion in a transaction.  Map IDs returned from this routine
 *     must be released with H5Mclose.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Mcreate_ff(hid_t loc_id, const char *name, hid_t keytype, hid_t valtype, 
             hid_t lcpl_id, hid_t mcpl_id, hid_t mapl_id, hid_t trans_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    void    *obj = NULL;        /* object token of loc_id */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    H5VL_loc_params_t loc_params;
    hid_t ret_value;

    FUNC_ENTER_API(FAIL)
    H5TRACE9("i", "i*siiiiiii", loc_id, name, keytype, valtype, lcpl_id, mcpl_id,
             mapl_id, trans_id, estack_id);

    /* Check arguments */
    if(!name || !*name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Get correct property list */
    if(H5P_DEFAULT == lcpl_id)
        lcpl_id = H5P_LINK_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lcpl_id, H5P_LINK_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link creation property list")

    /* Check map creation property list */
    if(H5P_DEFAULT == mcpl_id)
        mcpl_id = H5P_MAP_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(mcpl_id, H5P_MAP_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group create property list")

    /* Check the group access property list */
    if(H5P_DEFAULT == mapl_id)
        mapl_id = H5P_MAP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(mapl_id, H5P_MAP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group access property list")

    loc_params.type = H5VL_OBJECT_BY_SELF;
    loc_params.obj_type = H5I_get_type(loc_id);

    /* get the object */
    if(NULL == (obj = (void *)H5VL_get_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid object/file identifier")
    /* get the plugin pointer */
    if(NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")

    if(vol_plugin->cls->value != IOD)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "only IOD plugin supports MAP objects")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* call the IOD specific private routine to create a map object */
    if(NULL == (map = H5VL_iod_map_create(obj, loc_params, name, keytype, valtype, 
                                          lcpl_id, mcpl_id, mapl_id, trans_id, req)))
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create map")

    /* increment the ref count on the VOL plugin */
    vol_plugin->nrefs ++;

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack")
    }

    /* Get an atom for the map */
    if((ret_value = H5I_register2(H5I_MAP, map, vol_plugin, TRUE)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to atomize map handle")

done:
    if (ret_value < 0 && map)
        if(H5VL_iod_map_close (map, req) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to release map")
    FUNC_LEAVE_API(ret_value)
} /* end H5Mcreate_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Mopen_ff
 *
 * Purpose: 
 *     The H5Mopen routine opens an existing map object named
 *     name at the location given by loc_id.  The map access property list
 *     (mapl_id) modifies the map objectÕs behavior. The H5Mopen_ff
 *     routine is identical in functionality, but allows for asynchronous
 *     operation and inclusion in a transaction.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Mopen_ff(hid_t loc_id, const char *name, hid_t mapl_id, hid_t rcxt_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    void    *obj = NULL;        /* object token of loc_id */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    H5VL_loc_params_t loc_params;
    hid_t ret_value;

    FUNC_ENTER_API(FAIL)
    H5TRACE5("i", "i*siii", loc_id, name, mapl_id, rcxt_id, estack_id);

    /* Check arguments */
    if(!name || !*name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Check the group access property list */
    if(H5P_DEFAULT == mapl_id)
        mapl_id = H5P_MAP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(mapl_id, H5P_MAP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group access property list")

    loc_params.type = H5VL_OBJECT_BY_SELF;
    loc_params.obj_type = H5I_get_type(loc_id);

    /* get the object */
    if(NULL == (obj = (void *)H5VL_get_object(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid object/file identifier")
    /* get the plugin pointer */
    if(NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(loc_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information");

    if(vol_plugin->cls->value != IOD)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "only IOD plugin supports MAP objects");

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* call the IOD specific private routine to create a map object */
    if(NULL == (map = H5VL_iod_map_open(obj, loc_params, name, mapl_id, rcxt_id, req)))
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create map")

    /* increment the ref count on the VOL plugin */
    vol_plugin->nrefs ++;
    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack")
    }

    /* Get an atom for the map */
    if((ret_value = H5I_register2(H5I_MAP, map, vol_plugin, TRUE)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to atomize map handle")

done:
    if (ret_value < 0 && map)
        if(H5VL_iod_map_close (map, req) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to release map")
    FUNC_LEAVE_API(ret_value)
} /* end H5Mopen_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Mset_ff
 *
 * Purpose: 
 *      The H5Mset routine inserts or sets a key/value pair in a
 *      map object, given by map_id.  The key (pointed to by key) is of
 *      type key_mem_type_id in memory and the value (pointed to by value)
 *      is of type value_mem_type_id in memory. The data transfer property
 *      list (dxpl_id) may modify the operationÕs behavior. The H5Mset_ff
 *      routine is identical in functionality, but allows for asynchronous
 *      operation and inclusion in a transaction.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Mset_ff(hid_t map_id, hid_t key_mem_type_id, const void *key, hid_t val_mem_type_id, 
          const void *value, hid_t dxpl_id, hid_t trans_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE8("e", "ii*xi*xiii", map_id, key_mem_type_id, key, val_mem_type_id,
             value, dxpl_id, trans_id, estack_id);

    /* check arguments */
    if(!map_id)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a map")

    /* Get the default map transfer property list if the user didn't provide one */
    if(H5P_DEFAULT == dxpl_id)
        dxpl_id= H5P_DATASET_XFER_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dxpl_id, H5P_DATASET_XFER))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Set the data through the IOD VOL */
    if((ret_value = H5VL_iod_map_set(map, key_mem_type_id, key, val_mem_type_id, value, 
                                     dxpl_id, trans_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTSET, FAIL, "can't set map KV pair")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mset_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Mget_ff
 *
 * Purpose: 
 *      The H5Mget routine retrieves a value from a map object,
 *      given by map_id.  The key value used to retrieve the value (pointed
 *      to by key) is of type key_mem_type_id in memory and the value
 *      (pointed to by value) is of type value_mem_type_id in memory. The
 *      data transfer property list (dxpl_id) may modify the operationÕs
 *      behavior. The H5Mget_ff routine is identical in functionality, but
 *      allows for asynchronous operation and inclusion in a transaction.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Mget_ff(hid_t map_id, hid_t key_mem_type_id, const void *key, hid_t val_mem_type_id, 
          void *value, hid_t dxpl_id, hid_t rcxt_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE8("e", "ii*xi*xiii", map_id, key_mem_type_id, key, val_mem_type_id,
             value, dxpl_id, rcxt_id, estack_id);

    /* check arguments */
    if(!map_id)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a map")

    /* Get the default dataset transfer property list if the user didn't provide one */
    if(H5P_DEFAULT == dxpl_id)
        dxpl_id= H5P_DATASET_XFER_DEFAULT;
    else
        if(TRUE != H5P_isa_class(dxpl_id, H5P_DATASET_XFER))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not xfer parms")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Get the data through the IOD VOL */
    if((ret_value = H5VL_iod_map_get(map, key_mem_type_id, key, val_mem_type_id, value, 
                                     dxpl_id, rcxt_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get map value")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mget_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Mget_types_ff
 *
 * Purpose: 
 *     The H5Mget_types routine retrieves the datatypes for the
 *     keys and values of a map, given by map_id.  The key datatype is
 *     returned in key_type_id and the value datatype is returned in
 *     value_type_id.  The H5Mget_types_ff routine is identical in
 *     functionality, but allows for asynchronous operation and inclusion
 *     in a transaction.  Either (or both) of the datatype ID pointers may
 *     be NULL, if that datatype information is not desired.  Any datatype
 *     IDs returned from this routine must be released with H5Tclose.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Mget_types_ff(hid_t map_id, hid_t *key_type_id, hid_t *val_type_id, 
                hid_t rcxt_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE5("e", "i*i*iii", map_id, key_type_id, val_type_id, rcxt_id, estack_id);

    /* check arguments */
    if(!map_id)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a map")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Get the data through the IOD VOL */
    if((ret_value = H5VL_iod_map_get_types(map, key_type_id, val_type_id, rcxt_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get map value")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mget_types_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Mget_count_ff
 *
 * Purpose: 
 *     The H5Mget_count routine retrieves the number of key/value
 *     pairs in a map, given by map_id. The H5Mget_count_ff routine is
 *     identical in functionality, but allows for asynchronous operation
 *     and inclusion in a transaction.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Mget_count_ff(hid_t map_id, hsize_t *count, hid_t rcxt_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE4("e", "i*hii", map_id, count, rcxt_id, estack_id);

    /* check arguments */
    if(!map_id)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a map")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Get the data through the IOD VOL */
    if((ret_value = H5VL_iod_map_get_count(map, count, rcxt_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get map value")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mget_count_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Mexists_ff
 *
 * Purpose: 
 *     The H5Mexists routine checks if a key exists in a map,
 *     given by map_id.  The key value used (pointed to by key) is of type
 *     key_mem_type_id in memory and the status of the key in the map is
 *     returned in the exists pointerÕs value. The H5Mexists_ff routine is
 *     identical in functionality, but allows for asynchronous operation
 *     and inclusion in a transaction.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Mexists_ff(hid_t map_id, hid_t key_mem_type_id, const void *key, 
             hbool_t *exists, hid_t rcxt_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE6("e", "ii*x*bii", map_id, key_mem_type_id, key, exists, rcxt_id,
             estack_id);

    /* check arguments */
    if(!map_id)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a map")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Get the data through the IOD VOL */
    if((ret_value = H5VL_iod_map_exists(map, key_mem_type_id, key, exists, rcxt_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get map value")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mexists_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Miterate_ff
 *
 * Purpose: 
 *     The H5Miterate routine iterates over the key/value pairs
 *     in a map, given by map_id.  The user-defined callback routine, given
 *     by callback_func, defined below, will be invoked for each key/value
 *     pair in the map: 
 *
 *     typedef int (*H5M_iterate_func_t)(const void *key, const void *value, void *context); 
 *
 *     Keys and values presented to the
 *     callback routine will be in key_mem_type_id and value_mem_type_id
 *     format, respectively.  Additional information may be given to the
 *     callback routine with the context parameter, which is passed
 *     unmodified from the call to H5Miterate to the applicationÕs
 *     callback. The iteration callback routine should obey the same rules
 *     as other HDF5 iteration callbacks: return H5_ITER_ERROR for an error
 *     condition (which will stop iteration), H5_ITER_CONT for success
 *     (with continued iteration) and H5_ITER_STOP for success (but stop
 *     iteration).  
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Miterate_ff(hid_t map_id, hid_t key_mem_type_id, hid_t value_mem_type_id, 
              H5M_iterate_func_t callback_func, void *context, hid_t rcxt_id)
{
    //void   *map = NULL;
    herr_t ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE6("e", "iiix*xi", map_id, key_mem_type_id, value_mem_type_id,
             callback_func, context, rcxt_id);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Miterate */


/*-------------------------------------------------------------------------
 * Function:	H5Mdelete_ff
 *
 * Purpose: 
 *      The H5Mdelete routine removes a key/value pair from a map,
 *      given by map_id.  The key value used (pointed to by key) is of type
 *      key_mem_type_id in. The H5Mdelete_ff routine is identical in
 *      functionality, but allows for asynchronous operation and inclusion
 *      in a transaction.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Mdelete_ff(hid_t map_id, hid_t key_mem_type_id, const void *key, 
             hid_t trans_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object created */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE5("e", "ii*xii", map_id, key_mem_type_id, key, trans_id, estack_id);

    /* check arguments */
    if(!map_id)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a map")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")
    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* delete the key pair through the IOD VOL */
    if((ret_value = H5VL_iod_map_delete(map, key_mem_type_id, key, trans_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get map value")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }
done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mdelete_ff */


/*-------------------------------------------------------------------------
 * Function:	H5Mclose_ff
 *
 * Purpose: 
 *      The H5Mclose routine terminates access to a map, given by
 *      map_id. The H5Mclose_ff routine is identical in functionality, but
 *      allows for asynchronous operation and inclusion in a transaction.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Mclose_ff(hid_t map_id, hid_t estack_id)
{
    H5VL_t  *vol_plugin = NULL;
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_API(FAIL)
    H5TRACE2("e", "ii", map_id, estack_id);

    /* Check args */
    if(NULL == H5I_object_verify(map_id, H5I_MAP))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a map")

    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information");

    /* set the event queue and dxpl IDs to be passed on to the VOL layer */
    vol_plugin->close_estack_id = estack_id;
    vol_plugin->close_dxpl_id = H5AC_dxpl_id;

    /*
     * Decrement the counter on the group atom.	 It will be freed if the count
     * reaches zero.
     */
    if(H5I_dec_app_ref(map_id) < 0)
    	HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to close map")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mclose_ff */


/*-------------------------------------------------------------------------
 * Function:	H5M_close_map
 *
 * Purpose:	Called when the ref count reaches zero on the map_id
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Mohamad Chaarawi
 *              July 2013
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5M_close_map(void *map, H5VL_t *vol_plugin)
{
    H5_priv_request_t  *request = NULL;        /* private request struct inserted in event queue */
    void              **req = NULL;            /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    herr_t              ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI_NOINIT

    if(vol_plugin->close_estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Close the map through the VOL*/
    if(H5VL_iod_map_close(map, req) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to close map")

    if(request && *req) {
        if(H5ES_insert(vol_plugin->close_estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

    vol_plugin->nrefs --;
    if (0 == vol_plugin->nrefs) {
        vol_plugin->container_name = (const char *)H5MM_xfree(vol_plugin->container_name);
        vol_plugin = (H5VL_t *)H5MM_xfree(vol_plugin);
    }
done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5M_close_map() */


/*-------------------------------------------------------------------------
 * Function:	H5Mprefetch_ff
 *
 * Purpose:	Prefetched a Map from Central Storage to Burst Buffer.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Mohamad Chaarawi
 *              February 2014
 *
 *-------------------------------------------------------------------------
 */
H5_DLL herr_t H5Mprefetch_ff(hid_t map_id, hid_t rcxt_id, hrpl_t *replica_id,
                          hid_t mapl_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generate requests (Stays NULL if plugin does not support async */
    void    *map = NULL;        /* pointer to map object */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)

    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")
    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")

    /* Get correct property list */
    if(H5P_DEFAULT == mapl_id)
        mapl_id = H5P_MAP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(mapl_id, H5P_MAP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not map access property list")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Get the data through the IOD VOL */
    if((ret_value = H5VL_iod_prefetch(map, rcxt_id, replica_id, mapl_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't prefetch map")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mprefetch_ff() */


/*-------------------------------------------------------------------------
 * Function:	H5Mevict_ff
 *
 * Purpose:	Evicts a Map from Burst Buffer.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Mohamad Chaarawi
 *              February 2014
 *
 *-------------------------------------------------------------------------
 */
H5_DLL herr_t H5Mevict_ff(hid_t map_id, uint64_t c_version, hid_t mapl_id, hid_t estack_id)
{
    H5_priv_request_t  *request = NULL; /* private request struct inserted in event queue */
    void    **req = NULL;       /* pointer to plugin generated request pointer */
    void    *map = NULL;       /* pointer to map object */
    H5VL_t  *vol_plugin;        /* VOL plugin information */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_API(FAIL)

    /* get the map object */
    if(NULL == (map = (void *)H5I_object_verify(map_id, H5I_MAP)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "invalid map identifier")
    /* get the plugin pointer */
    if (NULL == (vol_plugin = (H5VL_t *)H5I_get_aux(map_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "ID does not contain VOL information")

    /* Get correct property list */
    if(H5P_DEFAULT == mapl_id)
        mapl_id = H5P_MAP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(mapl_id, H5P_MAP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not map access property list")

    if(estack_id != H5_EVENT_STACK_NULL) {
        /* create the private request */
        if(NULL == (request = (H5_priv_request_t *)H5MM_calloc(sizeof(H5_priv_request_t))))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed");
        request->req = NULL;
        req = &request->req;
        request->next = NULL;
        request->vol_plugin = vol_plugin;
        vol_plugin->nrefs ++;
    }

    /* Get the data through the IOD VOL */
    if((ret_value = H5VL_iod_evict(map, c_version, mapl_id, req)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't evict map")

    if(request && *req) {
        if(H5ES_insert(estack_id, request) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "failed to insert request in event stack");
    }

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Mevict_ff() */

#endif /* H5_HAVE_EFF */