summaryrefslogtreecommitdiffstats
path: root/src/H5G.c
blob: bee3373f44eba500c2a2bc39101f776bad93f294 (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
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:	H5G.c
 *		Jul 18 1997
 *		Robb Matzke <matzke@llnl.gov>
 *
 * Purpose:	Symbol table functions.	 The functions that begin with
 *		`H5G_stab_' don't understand the naming system; they operate
 * 		on a single symbol table at a time.
 *
 *		The functions that begin with `H5G_node_' operate on the leaf
 *		nodes of a symbol table B-tree.  They should be defined in
 *		the H5Gnode.c file.
 *
 *		The remaining functions know how to traverse the group
 *		directed graph.
 *
 * Names:	Object names are a slash-separated list of components.  If
 *		the name begins with a slash then it's absolute, otherwise
 *		it's relative ("/foo/bar" is absolute while "foo/bar" is
 *		relative).  Multiple consecutive slashes are treated as
 *		single slashes and trailing slashes are ignored.  The special
 *		case `/' is the root group.  Every file has a root group.
 *
 *		API functions that look up names take a location ID and a
 *		name.  The location ID can be a file ID or a group ID and the
 *		name can be relative or absolute.
 *
 *              +--------------+----------- +--------------------------------+
 * 		| Location ID  | Name       | Meaning                        |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "/foo/bar" | Find `foo' within `bar' within |
 *		|              |            | the root group of the specified|
 *		|              |            | file.                          |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "foo/bar"  | Find `foo' within `bar' within |
 *		|              |            | the root group of the specified|
 *		|              |            | file.                          |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "/"        | The root group of the specified|
 *		|              |            | file.                          |
 *              +--------------+------------+--------------------------------+
 * 		| File ID      | "."        | The root group of the specified|
 *		|              |            | the specified file.            |
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "/foo/bar" | Find `foo' within `bar' within |
 *		|              |            | the root group of the file     |
 *		|              |            | containing the specified group.|
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "foo/bar"  | File `foo' within `bar' within |
 *		|              |            | the specified group.           |
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "/"        | The root group of the file     |
 *		|              |            | containing the specified group.|
 *              +--------------+------------+--------------------------------+
 * 		| Group ID     | "."        | The specified group.           |
 *              +--------------+------------+--------------------------------+
 *
 *
 *-------------------------------------------------------------------------
 */

#define H5F_PACKAGE		/*suppress error about including H5Fpkg	  */
#define H5G_PACKAGE		/*suppress error about including H5Gpkg   */

/* Interface initialization */
#define H5_INTERFACE_INIT_FUNC	H5G_init_interface

/* Packages needed by this file... */
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fpkg.h"		/* File access				*/
#include "H5FLprivate.h"	/* Free Lists                           */
#include "H5Gpkg.h"		/* Groups		  		*/
#include "H5HLprivate.h"	/* Local Heaps				*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5Lprivate.h"         /* Links			  	*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Pprivate.h"         /* Property lists                       */

/* Local macros */
#define H5G_RESERVED_ATOMS	0

/* Local typedefs */

/* User data for path traversal routine for "insertion file" routine */
typedef struct {
    H5G_loc_t *loc;         /* Pointer to the location for insertion */
} H5G_trav_ins_t;

/* Package variables */

/* Local variables */

/* Declare a free list to manage the H5G_t struct */
H5FL_DEFINE(H5G_t);
H5FL_DEFINE(H5G_shared_t);

/* Private prototypes */
static H5G_t *H5G_create(H5F_t *file, hid_t dxpl_id, hid_t gcpl_id, hid_t gapl_id);
static herr_t H5G_open_oid(H5G_t *grp, hid_t dxpl_id);
static herr_t H5G_insertion_loc_cb(H5G_loc_t *grp_loc/*in*/, const char *name,
    const H5O_link_t *lnk, H5G_loc_t *obj_loc, void *_udata/*in,out*/,
    H5G_own_loc_t *own_loc/*out*/);


/*-------------------------------------------------------------------------
 * Function:	H5Gcreate
 *
 * Purpose:	Creates a new group relative to LOC_ID and gives it the
 *		specified NAME.  The group is opened for write access
 *		and it's object ID is returned.
 *
 *		The optional SIZE_HINT specifies how much file space to
 *		reserve to store the names that will appear in this
 *		group. If a non-positive value is supplied for the SIZE_HINT
 *		then a default size is chosen.
 *
 * See also:	H5Gset(), H5Gpush(), H5Gpop()
 *
 * Errors:
 *
 * Return:	Success:	The object ID of a new, empty group open for
 *				writing.  Call H5Gclose() when finished with
 *				the group.
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Wednesday, September 24, 1997
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gcreate(hid_t loc_id, const char *name, size_t size_hint)
{
    H5G_loc_t	    loc;
    H5G_loc_t	    grp_loc;
    H5G_t	   *grp = NULL;
    H5G_loc_t       insertion_loc;      /* Loc of group in which to create object */
    H5G_name_t      insert_path;        /* Path of group in which to create object */
    H5O_loc_t       insert_oloc;        /* oloc of group in which to create object */
    hbool_t         insert_loc_valid = FALSE;  /* Is insertion_loc valid? */
    H5F_t          *file;               /* File the group will be inserted into */
    hid_t           tmp_gcpl = (-1);    /* Temporary group creation property list */
    hid_t	    grp_id = (-1);      /* ID of group being created */
    hid_t	    ret_value;

    FUNC_ENTER_API(H5Gcreate, FAIL)
    H5TRACE3("i","isz",loc_id,name,size_hint);

    /* Check arguments */
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name given")

    /* Check if we need to create a non-standard GCPL */
    if(size_hint > 0) {
        H5P_genplist_t  *gc_plist;  /* Property list created */
        H5O_ginfo_t     ginfo;          /* Group info property */

        /* Get the default property list */
        if(NULL == (gc_plist = H5I_object(H5P_GROUP_CREATE_DEFAULT)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")

        /* Make a copy of the default property list */
        if((tmp_gcpl = H5P_copy_plist(gc_plist)) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "unable to copy the creation property list")

        /* Get the copy of the property list */
        if(NULL == (gc_plist = H5I_object(H5P_GROUP_CREATE_DEFAULT)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")

        /* Get the group info property */
        if(H5P_get(gc_plist, H5G_CRT_GROUP_INFO_NAME, &ginfo) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get group info")

        /* Set the non-default local heap size hint */
        ginfo.lheap_size_hint = size_hint;
        if(H5P_set(gc_plist, H5G_CRT_GROUP_INFO_NAME, &ginfo) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set group info")
    } /* end if */
    else
        tmp_gcpl = H5P_GROUP_CREATE_DEFAULT;

    /* What file is the group being added to?  This may not be the same file
     * that loc_id is in if mounting is being used. */
    insertion_loc.path = &insert_path;
    insertion_loc.oloc = &insert_oloc;
    H5G_loc_reset(&insertion_loc);
    if(H5G_insertion_loc(&loc, name, &insertion_loc, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to locate insertion point")
    insert_loc_valid=TRUE;
    file = insertion_loc.oloc->file;

    /* Create the group */
    if(NULL == (grp = H5G_create(file, H5AC_dxpl_id, tmp_gcpl, H5P_DEFAULT)))
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group")

    /* Get an ID for the newly created group */
    if((grp_id = H5I_register(H5I_GROUP, grp)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group")

    /* Get the new group's location */
    if(H5G_loc(grp_id, &grp_loc) <0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "unable to get location for new group")

    /* Link the new group to its parent group */
    if(H5L_link(&loc, name, &grp_loc, H5P_DEFAULT, H5P_DEFAULT, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_LINK, H5E_CANTINIT, FAIL, "unable to create link to group")

    /* Set the return value */
    ret_value = grp_id;

done:
    if(tmp_gcpl > 0 && tmp_gcpl != H5P_GROUP_CREATE_DEFAULT)
        if(H5I_dec_ref(tmp_gcpl) < 0)
            HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, FAIL, "unable to release property list")

    if(insert_loc_valid) {
        if(H5G_loc_free(&insertion_loc) < 0)
            HDONE_ERROR(H5E_OHDR, H5E_CANTRELEASE, FAIL, "unable to free location")
    }
    if(ret_value < 0) {
        if(grp_id >= 0)
            H5I_dec_ref(grp_id);
        else if(grp!=NULL)
            H5G_close(grp);
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Gcreate() */


/*-------------------------------------------------------------------------
 * Function:	H5Gcreate_expand
 *
 * Purpose:	Creates a new group relative to LOC_ID, giving it the
 *              specified creation property list GCPL_ID and access
 *              property list GAPL_ID.
 *
 *              The resulting ID should be linked into the file with
 *              H5Llink or it will be deleted when closed.
 *
 *              Given the default setting, H5Gcreate_expand() followed by
 *              H5Llink() will have the same function as H5Gcreate().
 *
 * Usage:       H5Gcreate_expand(loc_id, char *name, gcpl_id, gapl_id)
 *              hid_t loc_id;	  IN: File or group identifier
 *              const char *name; IN: Absolute or relative name of the new group
 *              hid_t gcpl_id;	  IN: Property list for group creation
 *              hid_t gapl_id;	  IN: Property list for group access
 *
 * Example:	To create missing groups "A" and "B01" along the given path "/A/B01/grp"
 *              hid_t create_id = H5Pcreate(H5P_GROUP_CREATE);
 *              int   status = H5Pset_create_intermediate_group(create_id, TRUE);
 *              hid_t gid = H5Gcreate_expand(file_id, "/A/B01/grp", create_id, H5P_DEFAULT);
 *
 * See also:	H5Gcreate(), H5Dcreate_expand(), H5Pset_create_intermediate_group()
 *
 * Errors:
 *
 * Return:	Success:	The object ID of a new, empty group open for
 *				writing.  Call H5Gclose() when finished with
 *				the group.
 *
 *		Failure:	FAIL
 *
 * Programmer:  Peter Cao
 *	        May 08, 2005
 *-------------------------------------------------------------------------
 */
hid_t
H5Gcreate_expand(hid_t loc_id, hid_t gcpl_id, hid_t gapl_id)
{
    H5G_loc_t	    loc;
    H5G_t	   *grp = NULL;
    hid_t	    ret_value;

    FUNC_ENTER_API(H5Gcreate_expand, FAIL)
    H5TRACE3("i","iii",loc_id,gcpl_id,gapl_id);

    /* Check arguments */
    if(H5G_loc(loc_id, &loc) < 0)
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")

    /* Check group creation property list */
    if(H5P_DEFAULT == gcpl_id)
        gcpl_id = H5P_GROUP_CREATE_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gcpl_id, H5P_GROUP_CREATE))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group create property list")

    /* Check the group access property list */
    if(H5P_DEFAULT == gapl_id)
        gapl_id = H5P_GROUP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gapl_id, H5P_GROUP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group access property list")

    /* Create the new group & get its ID */
    if(NULL == (grp = H5G_create(loc.oloc->file, H5AC_dxpl_id, gcpl_id, gapl_id)))
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group")
    if((ret_value = H5I_register(H5I_GROUP, grp)) < 0)
	HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group")

done:
    if(ret_value < 0) {
        if(grp!=NULL)
            H5G_close(grp);
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Gcreate_expand() */


/*-------------------------------------------------------------------------
 * Function:	H5Gopen
 *
 * Purpose:	Opens an existing group for modification.  When finished,
 *		call H5Gclose() to close it and release resources.
 *
 * Errors:
 *
 * Return:	Success:	Object ID of the group.
 *
 *		Failure:	FAIL
 *
 * Programmer:	Robb Matzke
 *		Wednesday, December 31, 1997
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gopen(hid_t loc_id, const char *name)
{
    H5G_t       *grp = NULL;
    H5G_loc_t	loc;
    H5G_loc_t   grp_loc;                /* Location used to open group */
    H5G_name_t  grp_path;            	/* Opened object group hier. path */
    H5O_loc_t   grp_oloc;            	/* Opened object object location */
    H5O_type_t  obj_type;               /* Type of object at location */
    hbool_t     loc_found = FALSE;      /* Location at 'name' found */
    hid_t       ret_value;              /* Return value */

    FUNC_ENTER_API(H5Gopen, FAIL)
    H5TRACE2("i","is",loc_id,name);

    /* Check args */
    if(H5G_loc(loc_id, &loc) < 0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Set up opened group location to fill in */
    grp_loc.oloc = &grp_oloc;
    grp_loc.path = &grp_path;
    H5G_loc_reset(&grp_loc);

    /* Find the group object */
    if(H5G_loc_find(&loc, name, &grp_loc/*out*/, H5P_DEFAULT, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "group not found")
    loc_found = TRUE;

    /* Check that the object found is the correct type */
    if(H5O_obj_type(&grp_oloc, &obj_type, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get object type")
    if(obj_type != H5O_TYPE_GROUP)
        HGOTO_ERROR(H5E_SYM, H5E_BADTYPE, FAIL, "not a group")

    /* Open the group */
    if((grp = H5G_open(&grp_loc, H5AC_dxpl_id)) == NULL)
        HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open group")

    /* Register an atom for the group */
    if((ret_value = H5I_register(H5I_GROUP, grp)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group")

done:
    if(ret_value < 0) {
        if(grp != NULL)
            H5G_close(grp);
        else {
            if(loc_found) {
                if(H5G_loc_free(&grp_loc) < 0)
                    HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't free location")
            }
        } /* end else */
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Gopen() */


/*-------------------------------------------------------------------------
 * Function:	H5Gopen_expand
 *
 * Purpose:	Opens an existing group for modification.  When finished,
 *		call H5Gclose() to close it and release resources.
 *
 *              This function allows the user the pass in a Group Access
 *              Property List, which H5Gopen() does not.
 *
 * Return:	Success:	Object ID of the group.
 *		Failure:	FAIL
 *
 * Programmer:	James Laird
 *		Thursday, July 27, 2006
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gopen_expand(hid_t loc_id, const char *name, hid_t gapl_id)
{
    H5G_t       *grp = NULL;
    H5G_loc_t	loc;
    H5G_loc_t   grp_loc;                /* Location used to open group */
    H5G_name_t  grp_path;            	/* Opened object group hier. path */
    H5O_loc_t   grp_oloc;            	/* Opened object object location */
    H5O_type_t  obj_type;               /* Type of object at location */
    hbool_t     loc_found = FALSE;      /* Location at 'name' found */
    hid_t       ret_value;              /* Return value */

    FUNC_ENTER_API(H5Gopen_expand, FAIL);
    H5TRACE3("i","isi",loc_id,name,gapl_id);

    /* Check args */
    if(H5G_loc(loc_id, &loc) < 0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")

    /* Check the group access property list */
    if(H5P_DEFAULT == gapl_id)
        gapl_id = H5P_GROUP_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(gapl_id, H5P_GROUP_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not group access property list")

    /* Set up opened group location to fill in */
    grp_loc.oloc = &grp_oloc;
    grp_loc.path = &grp_path;
    H5G_loc_reset(&grp_loc);

    /* Find the group object using the gapl passed in */
    if(H5G_loc_find(&loc, name, &grp_loc/*out*/, gapl_id, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "group not found")
    loc_found = TRUE;

    /* Check that the object found is the correct type */
    if(H5O_obj_type(&grp_oloc, &obj_type, H5AC_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't get object type")
    if(obj_type != H5O_TYPE_GROUP)
        HGOTO_ERROR(H5E_SYM, H5E_BADTYPE, FAIL, "not a group")

    /* Open the group */
    if((grp = H5G_open(&grp_loc, H5AC_dxpl_id)) == NULL)
        HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open group")

    /* Register an atom for the group */
    if((ret_value = H5I_register(H5I_GROUP, grp)) < 0)
        HGOTO_ERROR(H5E_ATOM, H5E_CANTREGISTER, FAIL, "unable to register group")

done:
    if(ret_value < 0) {
        if(grp != NULL)
            H5G_close(grp);
        else {
            if(loc_found) {
                if(H5G_loc_free(&grp_loc) < 0)
                    HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't free location")
            }
        } /* end else */
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Gopen_expand() */


/*-------------------------------------------------------------------------
 * Function:	H5Gget_create_plist
 *
 * Purpose:	Returns a copy of the group creation property list.
 *
 * Return:	Success:	ID for a copy of the group creation
 *				property list.  The property list ID should be
 *				released by calling H5Pclose().
 *
 *		Failure:	FAIL
 *
 * Programmer:	Quincey Koziol
 *		Tuesday, October 25, 2005
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5Gget_create_plist(hid_t group_id)
{
    htri_t	        ginfo_exists = 0;
    htri_t	        linfo_exists = 0;
    H5G_t		*grp = NULL;
    H5P_genplist_t      *gcpl_plist;
    H5P_genplist_t      *new_plist;
    hid_t		new_gcpl_id = FAIL;
    hid_t		ret_value = FAIL;

    FUNC_ENTER_API(H5Gget_create_plist, FAIL)
    H5TRACE1("i","i",group_id);

    /* Check args */
    if(NULL == (grp = H5I_object_verify(group_id, H5I_GROUP)))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a group")

    /* Copy the default group creation property list */
    if(NULL == (gcpl_plist = H5I_object(H5P_LST_GROUP_CREATE_g)))
         HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get default group creation property list")
    if((new_gcpl_id = H5P_copy_plist(gcpl_plist)) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "unable to copy the creation property list")
    if(NULL == (new_plist = H5I_object(new_gcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "can't get property list")

    /* Check for the group having a group info message */
    if((ginfo_exists = H5O_exists(&(grp->oloc), H5O_GINFO_ID, 0, H5AC_dxpl_id)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to read object header")
    if(ginfo_exists) {
        H5O_ginfo_t ginfo;		/* Group info message            */

        /* Read the group info */
        if(NULL == H5O_read(&(grp->oloc), H5O_GINFO_ID, 0, &ginfo, H5AC_dxpl_id))
            HGOTO_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "can't get group info")

        /* Set the group info for the property list */
        if(H5P_set(new_plist, H5G_CRT_GROUP_INFO_NAME, &ginfo) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set group info")
    } /* end if */

    /* Check for the group having a link info message */
    if((linfo_exists = H5O_exists(&(grp->oloc), H5O_LINFO_ID, 0, H5AC_dxpl_id)) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to read object header")
    if(linfo_exists) {
        H5O_linfo_t linfo;		/* Link info message            */

        /* Read the link info */
        if(NULL == H5O_read(&(grp->oloc), H5O_LINFO_ID, 0, &linfo, H5AC_dxpl_id))
            HGOTO_ERROR(H5E_SYM, H5E_BADMESG, FAIL, "can't get link info")

        /* Set the link info for the property list */
        if(H5P_set(new_plist, H5G_CRT_LINK_INFO_NAME, &linfo) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTSET, FAIL, "can't set link info")
    } /* end if */

    /* Set the return value */
    ret_value = new_gcpl_id;

done:
    if(ret_value < 0) {
        if(new_gcpl_id > 0)
            (void)H5I_dec_ref(new_gcpl_id);
    } /* end if */

    FUNC_LEAVE_API(ret_value)
} /* end H5Gget_create_plist() */


/*-------------------------------------------------------------------------
 * Function:	H5Gget_info
 *
 * Purpose:	Retrieve information about a group.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		November 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Gget_info(hid_t loc_id, const char *name, H5G_info_t *grp_info, hid_t lapl_id)
{
    H5G_loc_t	loc;                    /* Location of group */
    H5G_loc_t   grp_loc;                /* Location used to open group */
    H5G_name_t  grp_path;            	/* Opened object group hier. path */
    H5O_loc_t   grp_oloc;            	/* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Location at 'name' found */
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Gget_info, FAIL)

    /* Check args */
    if(H5G_loc(loc_id, &loc) < 0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name")
    if(!grp_info)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no info struct")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Set up opened group location to fill in */
    grp_loc.oloc = &grp_oloc;
    grp_loc.path = &grp_path;
    H5G_loc_reset(&grp_loc);

    /* Find the group object */
    if(H5G_loc_find(&loc, name, &grp_loc/*out*/, lapl_id, H5AC_ind_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "group not found")
    loc_found = TRUE;

    /* Retrieve the group's information */
    if(H5G_obj_info(grp_loc.oloc, grp_info/*out*/, H5AC_ind_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")

done:
    if(loc_found && H5G_loc_free(&grp_loc) < 0)
        HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't free location")

    FUNC_LEAVE_API(ret_value)
} /* end H5Gget_info() */


/*-------------------------------------------------------------------------
 * Function:	H5Gget_info_by_idx
 *
 * Purpose:	Retrieve information about a group, according to the order
 *              of an index.
 *
 * Return:	Success:	Non-negative
 *		Failure:	Negative
 *
 * Programmer:	Quincey Koziol
 *		November 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Gget_info_by_idx(hid_t loc_id, const char *group_name, H5L_index_t idx_type,
    H5_iter_order_t order, hsize_t n, H5G_info_t *grp_info, hid_t lapl_id)
{
    H5G_loc_t	loc;                    /* Location of group */
    H5G_loc_t   grp_loc;                /* Location used to open group */
    H5G_name_t  grp_path;            	/* Opened object group hier. path */
    H5O_loc_t   grp_oloc;            	/* Opened object object location */
    hbool_t     loc_found = FALSE;      /* Entry at 'name' found */
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_API(H5Gget_info_by_idx, FAIL)

    /* Check args */
    if(H5G_loc(loc_id, &loc) < 0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a location")
    if(!group_name || !*group_name)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no name specified")
    if(idx_type <= H5L_INDEX_UNKNOWN || idx_type >= H5L_INDEX_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid index type specified")
    if(order <= H5_ITER_UNKNOWN || order >= H5_ITER_N)
	HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "invalid iteration order specified")
    if(!grp_info)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "no info struct")
    if(H5P_DEFAULT == lapl_id)
        lapl_id = H5P_LINK_ACCESS_DEFAULT;
    else
        if(TRUE != H5P_isa_class(lapl_id, H5P_LINK_ACCESS))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not link access property list ID")

    /* Set up opened group location to fill in */
    grp_loc.oloc = &grp_oloc;
    grp_loc.path = &grp_path;
    H5G_loc_reset(&grp_loc);

    /* Find the object's location, according to the order in the index */
    if(H5G_loc_find_by_idx(&loc, group_name, idx_type, order, n, &grp_loc/*out*/, lapl_id, H5AC_ind_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, FAIL, "group not found")
    loc_found = TRUE;

    /* Retrieve the group's information */
    if(H5G_obj_info(grp_loc.oloc, grp_info/*out*/, H5AC_ind_dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTGET, FAIL, "can't retrieve group info")

done:
    /* Release the object location */
    if(loc_found && H5G_loc_free(&grp_loc) < 0)
        HDONE_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't free location")

    FUNC_LEAVE_API(ret_value)
} /* end H5Gget_info_by_idx() */


/*-------------------------------------------------------------------------
 * Function:	H5Gclose
 *
 * Purpose:	Closes the specified group.  The group ID will no longer be
 *		valid for accessing the group.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Wednesday, December 31, 1997
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Gclose(hid_t group_id)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_API(H5Gclose, FAIL);
    H5TRACE1("e","i",group_id);

    /* Check args */
    if(NULL == H5I_object_verify(group_id,H5I_GROUP))
	HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a group")

    /*
     * Decrement the counter on the group atom.	 It will be freed if the count
     * reaches zero.
     */
    if(H5I_dec_ref(group_id) < 0)
    	HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "unable to close group")

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Gclose() */

/*
 *-------------------------------------------------------------------------
 *-------------------------------------------------------------------------
 *   N O   A P I   F U N C T I O N S   B E Y O N D   T H I S   P O I N T
 *-------------------------------------------------------------------------
 *-------------------------------------------------------------------------
 */


/*-------------------------------------------------------------------------
 * Function:	H5G_init
 *
 * Purpose:	Initialize the interface from some other package.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Saturday, November 11, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_init(void)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5G_init, FAIL)
    /* FUNC_ENTER() does all the work */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_init() */


/*-------------------------------------------------------------------------
 * Function:	H5G_init_interface
 *
 * Purpose:	Initializes the H5G interface.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Monday, January	 5, 1998
 *
 * Notes:       The group creation properties are registered in the property
 *              list interface initialization routine (H5P_init_interface)
 *              so that the file creation property class can inherit from it
 *              correctly. (Which allows the file creation property list to
 *              control the group creation properties of the root group of
 *              a file) QAK - 24/10/2005
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5G_init_interface(void)
{
    herr_t          ret_value = SUCCEED;  /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5G_init_interface)

    /* Initialize the atom group for the group IDs */
    if(H5I_register_type(H5I_GROUP, (size_t)H5I_GROUPID_HASHSIZE, H5G_RESERVED_ATOMS, (H5I_free_t)H5G_close) < 0)
	HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to initialize interface")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_init_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5G_term_interface
 *
 * Purpose:	Terminates the H5G interface
 *
 * Return:	Success:	Positive if anything is done that might
 *				affect other interfaces; zero otherwise.
 *
 * 		Failure:	Negative.
 *
 * Programmer:	Robb Matzke
 *		Monday, January	 5, 1998
 *
 *-------------------------------------------------------------------------
 */
int
H5G_term_interface(void)
{
    int	n = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_term_interface)

    if (H5_interface_initialize_g) {
	if ((n = H5I_nmembers(H5I_GROUP))) {
	    H5I_clear_type(H5I_GROUP, FALSE);
	} else {
	    /* Destroy the group object id group */
	    H5I_dec_type_ref(H5I_GROUP);

            /* Free the global component buffer */
            H5G_traverse_term_interface();

	    /* Mark closed */
	    H5_interface_initialize_g = 0;
	    n = 1; /*H5I*/
	} /* end else */
    } /* end if */

    FUNC_LEAVE_NOAPI(n)
} /* end H5G_term_interface() */


/*-------------------------------------------------------------------------
 * Function:	H5G_component
 *
 * Purpose:	Returns the pointer to the first component of the
 *		specified name by skipping leading slashes.  Returns
 *		the size in characters of the component through SIZE_P not
 *		counting leading slashes or the null terminator.
 *
 * Return:	Success:	Ptr into NAME.
 *
 *		Failure:	Ptr to the null terminator of NAME.
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Aug 11 1997
 *
 *-------------------------------------------------------------------------
 */
const char *
H5G_component(const char *name, size_t *size_p)
{
    /* Use FUNC_ENTER_NOAPI_NOINIT_NOFUNC here to avoid performance issues */
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_component)

    assert(name);

    while ('/' == *name)
        name++;
    if (size_p)
        *size_p = HDstrcspn(name, "/");

    FUNC_LEAVE_NOAPI(name)
} /* end H5G_component() */


/*-------------------------------------------------------------------------
 * Function:	H5G_normalize
 *
 * Purpose:	Returns a pointer to a new string which has duplicate and
 *              trailing slashes removed from it.
 *
 * Return:	Success:	Ptr to normalized name.
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Saturday, August 16, 2003
 *
 *-------------------------------------------------------------------------
 */
char *
H5G_normalize(const char *name)
{
    char *norm;         /* Pointer to the normalized string */
    size_t	s,d;    /* Positions within the strings */
    unsigned    last_slash;     /* Flag to indicate last character was a slash */
    char *ret_value;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5G_normalize);

    /* Sanity check */
    assert(name);

    /* Duplicate the name, to return */
    if (NULL==(norm=H5MM_strdup(name)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for normalized string");

    /* Walk through the characters, omitting duplicated '/'s */
    s=d=0;
    last_slash=0;
    while(name[s]!='\0') {
        if(name[s]=='/')
            if(last_slash)
                ;
            else {
                norm[d++]=name[s];
                last_slash=1;
            } /* end else */
        else {
            norm[d++]=name[s];
            last_slash=0;
        } /* end else */
        s++;
    } /* end while */

    /* Terminate normalized string */
    norm[d]='\0';

    /* Check for final '/' on normalized name & eliminate it */
    if(d>1 && last_slash)
        norm[d-1]='\0';

    /* Set return value */
    ret_value=norm;

done:
    FUNC_LEAVE_NOAPI(ret_value);
} /* end H5G_normalize() */


/*-------------------------------------------------------------------------
 * Function:	H5G_mkroot
 *
 * Purpose:	Creates a root group in an empty file and opens it.  If a
 *		root group is already open then this function immediately
 *		returns.   If ENT is non-null then it's the symbol table
 *		entry for an existing group which will be opened as the root
 *		group.  Otherwise a new root group is created and then
 *		opened.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Aug 11 1997
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_mkroot(H5F_t *f, hid_t dxpl_id, H5G_loc_t *loc)
{
    H5O_loc_t	new_root_oloc;		/* New root object location */
    H5G_name_t	new_root_path;		/* New root path */
    H5G_loc_t   new_root_loc;           /* New root location information */
    H5G_loc_t   root_loc;               /* Root location information */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(H5G_mkroot, FAIL)

    /* check args */
    HDassert(f);
    if(f->shared->root_grp)
        HGOTO_DONE(SUCCEED)

    /* Create information needed for group nodes */
    if(H5G_node_init(f) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group node info")

    /*
     * If there is no root object then create one. The root group always starts
     * with a hard link count of one since it's pointed to by the boot block.
     */
    if (loc == NULL) {
        H5P_genplist_t *fc_plist;       /* File creation property list */
        H5O_ginfo_t     ginfo;          /* Group info parameters */
        H5O_linfo_t     linfo;          /* Link info parameters */

        /* Get the file creation property list */
        /* (Which is a sub-class of the group creation property class) */
        if(NULL == (fc_plist = H5I_object(f->shared->fcpl_id)))
            HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a property list")

        /* Get the group info property */
        if(H5P_get(fc_plist, H5G_CRT_GROUP_INFO_NAME, &ginfo) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get group info")

        /* Get the link info property */
        if(H5P_get(fc_plist, H5G_CRT_LINK_INFO_NAME, &linfo) < 0)
            HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't get link info")

        /* Set up group location for root group */
        new_root_loc.oloc = &new_root_oloc;
        new_root_loc.path = &new_root_path;
        H5G_loc_reset(&new_root_loc);
        loc = &new_root_loc;

	if(H5G_obj_create(f, dxpl_id, &ginfo, &linfo, loc->oloc/*out*/) < 0)
	    HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to create group entry")
	if(1 != H5O_link(loc->oloc, 1, dxpl_id))
	    HGOTO_ERROR(H5E_SYM, H5E_LINKCOUNT, FAIL, "internal error (wrong link count)")
    } else {
	/*
	 * Open the root object as a group.
	 */
	if(H5O_open(loc->oloc) < 0)
	    HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open root group")
    } /* end else */

    /* Create the path names for the root group's entry */
    H5G_name_init(loc->path, "/");

    /*
     * Create the group pointer.  Also decrement the open object count so we
     * don't count the root group as an open object.  The root group will
     * never be closed.
     */
    if(NULL == (f->shared->root_grp = H5FL_CALLOC(H5G_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
    if(NULL == (f->shared->root_grp->shared = H5FL_CALLOC(H5G_shared_t))) {
        H5FL_FREE(H5G_t, f->shared->root_grp);
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
    } /* end if */

    /* Shallow copy (take ownership) of the group object info */
    root_loc.oloc = &(f->shared->root_grp->oloc);
    root_loc.path = &(f->shared->root_grp->path);
    if(H5G_loc_copy(&root_loc, loc, H5_COPY_SHALLOW) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTCOPY, FAIL, "can't copy group object location")

    f->shared->root_grp->shared->fo_count = 1;
    HDassert(1 == f->nopen_objs);
    f->nopen_objs = 0;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_mkroot() */


/*-------------------------------------------------------------------------
 * Function:	H5G_create
 *
 * Purpose:	Creates a new empty group with the specified name. The name
 *		is either an absolute name or is relative to LOC.
 *
 * Return:	Success:	A handle for the group.	 The group is opened
 *				and should eventually be close by calling
 *				H5G_close().
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *		matzke@llnl.gov
 *		Aug 11 1997
 *
 *-------------------------------------------------------------------------
 */
static H5G_t *
H5G_create(H5F_t *file, hid_t dxpl_id, hid_t gcpl_id, hid_t UNUSED gapl_id)
{
    H5G_t	*grp = NULL;	/*new group			*/
    H5P_genplist_t  *gc_plist;  /* Property list created */
    H5O_ginfo_t ginfo;          /* Group info */
    H5O_linfo_t linfo;          /* Link info */
    unsigned    oloc_init = 0;  /* Flag to indicate that the group object location was created successfully */
    H5G_t	*ret_value;	/* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5G_create)

    /* check args */
    HDassert(file);
    HDassert(gcpl_id != H5P_DEFAULT);
#ifdef LATER
    HDassert(gapl_id != H5P_DEFAULT);
#endif /* LATER */

    /* create an open group */
    if(NULL == (grp = H5FL_CALLOC(H5G_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
    if(NULL == (grp->shared = H5FL_CALLOC(H5G_shared_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* Get the property list */
    if(NULL == (gc_plist = H5I_object(gcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a property list")

    /* Get the group info property */
    if(H5P_get(gc_plist, H5G_CRT_GROUP_INFO_NAME, &ginfo) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get group info")

    /* Get the link info property */
    if(H5P_get(gc_plist, H5G_CRT_LINK_INFO_NAME, &linfo) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't get group info")

    /* Create the group object header */
    if(H5G_obj_create(file, dxpl_id, &ginfo, &linfo, &(grp->oloc)/*out*/) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, NULL, "unable to create group object header")
    oloc_init = 1;    /* Indicate that the object location information is valid */

    /* Add group to list of open objects in file */
    if(H5FO_top_incr(grp->oloc.file, grp->oloc.addr) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTINC, NULL, "can't incr object ref. count")
    if(H5FO_insert(grp->oloc.file, grp->oloc.addr, grp->shared, TRUE) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, NULL, "can't insert group into list of open objects")

    /* Set the count of times the object is opened */
    grp->shared->fo_count = 1;
    
    /* Set return value */
    ret_value = grp;

done:
    if(ret_value == NULL) {
        /* Check if we need to release the file-oriented symbol table info */
        if(oloc_init) {
            if(H5O_close(&(grp->oloc)) < 0)
                HDONE_ERROR(H5E_SYM, H5E_CLOSEERROR, NULL, "unable to release object header")
            if(H5O_delete(file, dxpl_id, grp->oloc.addr) < 0)
                HDONE_ERROR(H5E_SYM, H5E_CANTDELETE, NULL, "unable to delete object header")
        } /* end if */
        if(grp != NULL) {
            if(grp->shared != NULL)
                H5FL_FREE(H5G_shared_t, grp->shared);
            H5FL_FREE(H5G_t,grp);
        } /* end if */
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_create() */


/*-------------------------------------------------------------------------
 * Function:	H5G_open
 *
 * Purpose:	Opens an existing group.  The group should eventually be
 *		closed by calling H5G_close().
 *
 * Return:	Success:	Ptr to a new group.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *		Monday, January	 5, 1998
 *
 *-------------------------------------------------------------------------
 */
H5G_t *
H5G_open(H5G_loc_t *loc, hid_t dxpl_id)
{
    H5G_t           *grp = NULL;
    H5G_shared_t    *shared_fo = NULL;
    H5G_t           *ret_value = NULL;

    FUNC_ENTER_NOAPI(H5G_open, NULL)

    /* Check args */
    HDassert(loc);

    /* Allocate the group structure */
    if(NULL == (grp = H5FL_CALLOC(H5G_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "can't allocate space for group")

    /* Shallow copy (take ownership) of the group location object */
    if(H5O_loc_copy(&(grp->oloc), loc->oloc, H5_COPY_SHALLOW) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTCOPY, NULL, "can't copy object location")
    if(H5G_name_copy(&(grp->path), loc->path, H5_COPY_SHALLOW) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTCOPY, NULL, "can't copy path")

    /* Check if group was already open */
    if((shared_fo = H5FO_opened(grp->oloc.file, grp->oloc.addr)) == NULL) {

        /* Clear any errors from H5FO_opened() */
        H5E_clear_stack(NULL);

        /* Open the group object */
        if(H5G_open_oid(grp, dxpl_id) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_NOTFOUND, NULL, "not found")

        /* Add group to list of open objects in file */
        if(H5FO_insert(grp->oloc.file, grp->oloc.addr, grp->shared, FALSE) < 0) {
            H5FL_FREE(H5G_shared_t, grp->shared);
            HGOTO_ERROR(H5E_SYM, H5E_CANTINSERT, NULL, "can't insert group into list of open objects")
        } /* end if */

        /* Increment object count for the object in the top file */
        if(H5FO_top_incr(grp->oloc.file, grp->oloc.addr) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINC, NULL, "can't increment object count")

        /* Set open object count */
        grp->shared->fo_count = 1;
    } /* end if */
    else {
        /* Point to shared group info */
        grp->shared = shared_fo;

        /* Increment shared reference count */
        shared_fo->fo_count++;

        /* Check if the object has been opened through the top file yet */
        if(H5FO_top_count(grp->oloc.file, grp->oloc.addr) == 0) {
            /* Open the object through this top file */
            if(H5O_open(&(grp->oloc)) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, NULL, "unable to open object header")
        } /* end if */

        /* Increment object count for the object in the top file */
        if(H5FO_top_incr(grp->oloc.file, grp->oloc.addr) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINC, NULL, "can't increment object count")
    } /* end else */

    /* Set return value */
    ret_value = grp;

done:
    if (!ret_value && grp)
    {
        H5O_loc_free(&(grp->oloc));
        H5G_name_free(&(grp->path));
        H5FL_FREE(H5G_t,grp);
    }

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_open() */


/*-------------------------------------------------------------------------
 * Function:	H5G_open_oid
 *
 * Purpose:	Opens an existing group.  The group should eventually be
 *		closed by calling H5G_close().
 *
 * Return:	Success:	Ptr to a new group.
 *
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *	    Wednesday, March	17, 1999
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5G_open_oid(H5G_t *grp, hid_t dxpl_id)
{
    hbool_t             obj_opened = FALSE;
    herr_t		ret_value = SUCCEED;

    FUNC_ENTER_NOAPI_NOINIT(H5G_open_oid)

    /* Check args */
    HDassert(grp);

    /* Allocate the shared information for the group */
    if(NULL == (grp->shared = H5FL_CALLOC(H5G_shared_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")

    /* Grab the object header */
    if(H5O_open(&(grp->oloc)) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "unable to open group")
    obj_opened = TRUE;

    /* Check if this object has the right message(s) to be treated as a group */
    if((H5O_exists(&(grp->oloc), H5O_STAB_ID, 0, dxpl_id) <= 0)
            && (H5O_exists(&(grp->oloc), H5O_LINFO_ID, 0, dxpl_id) <= 0))
        HGOTO_ERROR(H5E_SYM, H5E_CANTOPENOBJ, FAIL, "not a group")

done:
    if(ret_value < 0) {
        if(obj_opened)
            H5O_close(&(grp->oloc));
        if(grp->shared)
            H5FL_FREE(H5G_shared_t, grp->shared);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_open_oid() */


/*-------------------------------------------------------------------------
 * Function:	H5G_close
 *
 * Purpose:	Closes the specified group.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Monday, January	 5, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_close(H5G_t *grp)
{
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5G_close, FAIL)

    /* Check args */
    HDassert(grp && grp->shared);
    HDassert(grp->shared->fo_count > 0);

    --grp->shared->fo_count;

    if(0 == grp->shared->fo_count) {
        HDassert(grp != H5G_rootof(H5G_fileof(grp)));

        /* Remove the group from the list of opened objects in the file */
        if(H5FO_top_decr(grp->oloc.file, grp->oloc.addr) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't decrement count for object")
        if(H5FO_delete(grp->oloc.file, H5AC_dxpl_id, grp->oloc.addr) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't remove group from list of open objects")
        if(H5O_close(&(grp->oloc)) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to close")
        H5FL_FREE(H5G_shared_t, grp->shared);
    } else {
        /* Decrement the ref. count for this object in the top file */
        if(H5FO_top_decr(grp->oloc.file, grp->oloc.addr) < 0)
            HGOTO_ERROR(H5E_SYM, H5E_CANTRELEASE, FAIL, "can't decrement count for object")

        /* Check reference count for this object in the top file */
        if(H5FO_top_count(grp->oloc.file, grp->oloc.addr) == 0)
            if(H5O_close(&(grp->oloc)) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "unable to close")

        /* If this group is a mount point and the mount point is the last open
         * reference to the group, then attempt to close down the file hierarchy
         */
        if(grp->shared->mounted && grp->shared->fo_count == 1) {
            /* Attempt to close down the file hierarchy */
            if(H5F_try_close(grp->oloc.file) < 0)
                HGOTO_ERROR(H5E_FILE, H5E_CANTCLOSEFILE, FAIL, "problem attempting file close")
        } /* end if */
    } /* end else */

    if(H5G_name_free(&(grp->path)) < 0) {
        H5FL_FREE(H5G_t,grp);
        HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, FAIL, "can't free group entry name")
    } /* end if */

    H5FL_FREE(H5G_t,grp);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_close() */


/*-------------------------------------------------------------------------
 * Function:    H5G_free
 *
 * Purpose:	Free memory used by an H5G_t struct (and its H5G_shared_t).
 *          Does not close the group or decrement the reference count.
 *          Used to free memory used by the root group.
 *
 * Return:  Success:    Non-negative
 *	        Failure:    Negative
 *
 * Programmer:  James Laird
 *              Tuesday, September 7, 2004
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_free(H5G_t *grp)
{
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5G_free, FAIL)

    HDassert(grp && grp->shared);

    H5FL_FREE(H5G_shared_t, grp->shared);
    H5FL_FREE(H5G_t, grp);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_free() */


/*-------------------------------------------------------------------------
 * Function:	H5G_rootof
 *
 * Purpose:	Return a pointer to the root group of the file.  If the file
 *		is part of a virtual file then the root group of the virtual
 *		file is returned.
 *
 * Return:	Success:	Ptr to the root group of the file.  Do not
 *				free the pointer -- it points directly into
 *				the file struct.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Tuesday, October 13, 1998
 *
 *-------------------------------------------------------------------------
 */
H5G_t *
H5G_rootof(H5F_t *f)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_rootof)

    while(f->mtab.parent)
        f = f->mtab.parent;

    FUNC_LEAVE_NOAPI(f->shared->root_grp)
} /* end H5G_rootof() */


/*-------------------------------------------------------------------------
 * Function:	H5G_oloc
 *
 * Purpose:	Returns a pointer to the object location for a group.
 *
 * Return:	Success:	Ptr to group entry
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Tuesday, March 24, 1998
 *
 *-------------------------------------------------------------------------
 */
H5O_loc_t *
H5G_oloc(H5G_t *grp)
{
    /* Use FUNC_ENTER_NOAPI_NOINIT_NOFUNC here to avoid performance issues */
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_oloc)

    FUNC_LEAVE_NOAPI(grp ? &(grp->oloc) : NULL)
} /* end H5G_oloc() */


/*-------------------------------------------------------------------------
 * Function:	H5G_nameof
 *
 * Purpose:	Returns a pointer to the hier. name for a group.
 *
 * Return:	Success:	Ptr to hier. name
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Monday, September 12, 2005
 *
 *-------------------------------------------------------------------------
 */
H5G_name_t *
H5G_nameof(H5G_t *grp)
{
    /* Use FUNC_ENTER_NOAPI_NOINIT_NOFUNC here to avoid performance issues */
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_nameof)

    FUNC_LEAVE_NOAPI(grp ? &(grp->path) : NULL)
} /* end H5G_nameof() */


/*-------------------------------------------------------------------------
 * Function:	H5G_fileof
 *
 * Purpose:	Returns the file to which the specified group belongs.
 *
 * Return:	Success:	File pointer.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Tuesday, March 24, 1998
 *
 *-------------------------------------------------------------------------
 */
H5F_t *
H5G_fileof(H5G_t *grp)
{
    /* Use FUNC_ENTER_NOAPI_NOINIT_NOFUNC here to avoid performance issues */
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_fileof)

    HDassert(grp);

    FUNC_LEAVE_NOAPI(grp->oloc.file)
} /* end H5G_fileof() */


/*-------------------------------------------------------------------------
 * Function:	H5G_map_obj_type
 *
 * Purpose:	Maps the object type to the older "group" object type
 *
 * Return:	Object type (can't fail)
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, November 21, 2006
 *
 *-------------------------------------------------------------------------
 */
H5G_obj_t
H5G_map_obj_type(H5O_type_t obj_type)
{
    H5G_obj_t ret_value;        /* Return value */

    /* Use FUNC_ENTER_NOAPI_NOINIT_NOFUNC here to avoid performance issues */
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_map_obj_type)

    /* Map object type to older "group" object type */
    switch(obj_type) {
        case H5O_TYPE_GROUP:
            ret_value = H5G_GROUP;
            break;

        case H5O_TYPE_DATASET:
            ret_value = H5G_DATASET;
            break;

        case H5O_TYPE_NAMED_DATATYPE:
            ret_value = H5G_TYPE;
            break;

        default:
            ret_value = H5G_UNKNOWN;
    } /* end switch */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_map_obj_type() */


/*-------------------------------------------------------------------------
 * Function:	H5G_insertion_loc_cb
 *
 * Purpose:	Callback for finding insertion location.  This routine sets the
 *              correct information in the location passed in through the udata.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	James Laird
 *              Wednesday, August 16, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5G_insertion_loc_cb(H5G_loc_t *grp_loc/*in*/, const char UNUSED *name, const H5O_link_t UNUSED *lnk,
    H5G_loc_t *obj_loc, void *_udata/*in,out*/, H5G_own_loc_t *own_loc/*out*/)
{
    H5G_trav_ins_t *udata = (H5G_trav_ins_t *)_udata;   /* User data passed in */
    herr_t ret_value = SUCCEED;              /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5G_insertion_loc_cb)

    /* Check if the name in this group resolves to a valid location */
    /* (which is not what we want) */
    if(obj_loc != NULL)
        HGOTO_ERROR(H5E_SYM, H5E_EXISTS, FAIL, "name already exists")

    /* Take ownership of the grp_loc */
    if(H5G_loc_copy(udata->loc, grp_loc, H5_COPY_SHALLOW) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_CANTCOPY, FAIL, "couldn't take ownership of group location")
    *own_loc = H5G_OWN_GRP_LOC;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_insertion_loc_cb() */


/*-------------------------------------------------------------------------
 * Function:	H5G_insertion_loc
 *
 * Purpose:	Given a location and name that specifies a not-yet-existing
 *		object return the location of the group into which the object
 *              is about to be inserted.
 *
 * Return:	Success:	H5G_loc_t pointer
 *                              (should be released with H5G_loc_free)
 *
 *		Failure:	NULL
 *
 * Programmer:	James Laird
 *              Wednesday, August 16, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_insertion_loc(H5G_loc_t *src_loc, const char *name,
    H5G_loc_t *insertion_loc/*out*/, hid_t dxpl_id)
{
    H5G_trav_ins_t udata;           /* User data for traversal */
    herr_t         ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5G_insertion_loc, FAIL)

    HDassert(src_loc);
    HDassert(insertion_loc);
    HDassert(name && *name);

    /*
     * Look up the name to get the containing group's location and to make
     * sure the name doesn't already exist.
     */
    udata.loc = insertion_loc;
    if(H5G_traverse(src_loc, name, H5G_TARGET_NORMAL, H5G_insertion_loc_cb, &udata, H5P_DEFAULT, dxpl_id) < 0)
        HGOTO_ERROR(H5E_SYM, H5E_EXISTS, FAIL, "name already exists")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_insertion_loc() */


/*-------------------------------------------------------------------------
 * Function:	H5G_free_grp_name
 *
 * Purpose:	Free the 'ID to name' buffers.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 *
 * Date: August 22, 2002
 *
 * Comments: Used now only on the root group close, in H5F_close()
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_free_grp_name(H5G_t *grp)
{
    herr_t ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5G_free_grp_name, FAIL)

    /* Check args */
    HDassert(grp && grp->shared);
    HDassert(grp->shared->fo_count > 0);

    /* Free the path */
    H5G_name_free(&(grp->path));

done:
     FUNC_LEAVE_NOAPI(ret_value)
} /* end H5G_free_grp_name() */


/*-------------------------------------------------------------------------
 * Function:	H5G_get_shared_count
 *
 * Purpose:	Queries the group object's "shared count"
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Tuesday, July	 5, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_get_shared_count(H5G_t *grp)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_get_shared_count);

    /* Check args */
    HDassert(grp && grp->shared);

    FUNC_LEAVE_NOAPI(grp->shared->fo_count);
} /* end H5G_get_shared_count() */


/*-------------------------------------------------------------------------
 * Function:	H5G_mount
 *
 * Purpose:	Sets the 'mounted' flag for a group
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Tuesday, July 19, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_mount(H5G_t *grp)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_mount);

    /* Check args */
    HDassert(grp && grp->shared);
    HDassert(grp->shared->mounted == FALSE);

    /* Set the 'mounted' flag */
    grp->shared->mounted = TRUE;

    FUNC_LEAVE_NOAPI(SUCCEED);
} /* end H5G_mount() */


/*-------------------------------------------------------------------------
 * Function:	H5G_unmount
 *
 * Purpose:	Resets the 'mounted' flag for a group
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Tuesday, July 19, 2005
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5G_unmount(H5G_t *grp)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5G_unmount);

    /* Check args */
    HDassert(grp && grp->shared);
    HDassert(grp->shared->mounted == TRUE);

    /* Reset the 'mounted' flag */
    grp->shared->mounted = FALSE;

    FUNC_LEAVE_NOAPI(SUCCEED);
} /* end H5G_unmount() */