summaryrefslogtreecommitdiffstats
path: root/src/H5HFiblock.c
blob: fd7b52038f0a9a63367a1183e780331b8177f315 (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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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:		H5HFiblock.c
 *			Apr 10 2006
 *			Quincey Koziol <koziol@ncsa.uiuc.edu>
 *
 * Purpose:		Indirect block routines for fractal heaps.
 *
 *-------------------------------------------------------------------------
 */

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

#define H5HF_PACKAGE		/*suppress error about including H5HFpkg  */

/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5HFpkg.h"		/* Fractal heaps			*/
#include "H5MFprivate.h"	/* File memory management		*/
#include "H5Vprivate.h"		/* Vectors and arrays 			*/

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


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


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


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

/* Indirect block routines */
static herr_t H5HF_man_iblock_skip_blocks(H5HF_hdr_t *hdr, 
    H5HF_indirect_t *iblock, haddr_t iblock_addr,
    unsigned start_entry, unsigned nentries);
static herr_t H5HF_man_iblock_skip_ranges(H5HF_hdr_t *hdr,
    H5HF_indirect_t *iblock, haddr_t iblock_addr,
    unsigned start_entry, unsigned nentries);
static herr_t H5HF_man_iblock_double_root(H5HF_hdr_t *hdr, hid_t dxpl_id,
    size_t min_dblock_size);
static herr_t H5HF_man_iblock_create(H5HF_hdr_t *hdr, hid_t dxpl_id,
    hsize_t block_off, unsigned nrows, unsigned max_rows, haddr_t *addr_p);
static herr_t H5HF_man_iblock_build_sections(H5HF_indirect_t *iblock);

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

/* Declare a free list to manage the H5HF_indirect_t struct */
H5FL_DEFINE(H5HF_indirect_t);

/* Declare a free list to manage the H5HF_indirect_ent_t sequence information */
H5FL_SEQ_DEFINE(H5HF_indirect_ent_t);


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


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



/*-------------------------------------------------------------------------
 * Function:	H5HF_iblock_incr
 *
 * Purpose:	Increment reference count on shared indirect block
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Mar 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF_iblock_incr(H5HF_indirect_t *iblock)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_iblock_incr)

    /* Sanity check */
    HDassert(iblock);

    /* Mark block as un-evictable when a child block is depending on it */
    if(iblock->rc == 0)
        if(H5AC_pin_protected_entry(iblock->hdr->f, iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTPIN, FAIL, "unable to pin fractal heap indirect block")

    /* Increment reference count on shared indirect block */
    iblock->rc++;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_iblock_incr() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_iblock_decr
 *
 * Purpose:	Decrement reference count on shared indirect block
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Mar 27 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF_iblock_decr(H5HF_indirect_t *iblock)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_iblock_decr)

    /* Sanity check */
    HDassert(iblock);

    /* Decrement reference count on shared indirect block */
    iblock->rc--;

    /* Mark block as evictable again when no child blocks depend on it */
    if(iblock->rc == 0)
        if(H5AC_unpin_entry(iblock->hdr->f, iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTUNPIN, FAIL, "unable to unpin fractal heap indirect block")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_iblock_decr() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_iblock_dirty
 *
 * Purpose:	Mark indirect block as dirty
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Mar 21 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF_iblock_dirty(H5HF_indirect_t *iblock)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_iblock_dirty)
#ifdef QAK
HDfprintf(stderr, "%s: Marking indirect block as dirty\n", FUNC);
#endif /* QAK */

    /* Sanity check */
    HDassert(iblock);

/* XXX: Need to mark a protected block as dirty eventually also... */
{
    unsigned entry_status;              /* Indirect block entry status */

    if(H5AC_get_entry_status(iblock->hdr->f, iblock->addr, &entry_status) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTMARKDIRTY, FAIL, "unable to query fractal heap indirect block status")
    HDassert(entry_status & H5AC_ES__IN_CACHE);

    if(!(entry_status & H5AC_ES__IS_PROTECTED)) {
        /* Mark indirect block as dirty in cache */
        if(H5AC_mark_pinned_entry_dirty(iblock->hdr->f, iblock, FALSE, 0) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTMARKDIRTY, FAIL, "unable to mark fractal heap indirect block as dirty")
    } /* end if */
}

    /* Set the dirty flag for the indirect block */
    iblock->dirty = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_iblock_dirty() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_skip_blocks
 *
 * Purpose:	Add skipped direct blocks to free space for heap
 *
 * Return:	SUCCEED/FAIL
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Apr  3 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HF_man_iblock_skip_blocks(H5HF_hdr_t *hdr, H5HF_indirect_t *iblock,
    haddr_t iblock_addr, unsigned start_entry, unsigned nentries)
{
    H5HF_free_section_t *sec_node; /* Pointer to free list section for range */
    hsize_t sect_off;                   /* Offset of free section in heap */
    unsigned curr_row;                  /* Current row in indirect block */
    unsigned curr_col;                  /* Current column in indirect block */
    unsigned u;                         /* Local index variables */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_skip_blocks)
#ifdef QAK
HDfprintf(stderr, "%s: start_entry = %u, nentries = %u\n", FUNC, start_entry, nentries);
#endif /* QAK */

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(iblock);
    HDassert(H5F_addr_defined(iblock_addr));

    /* Compute starting column & row */
    curr_row = start_entry / hdr->man_dtable.cparam.width;
    curr_col = start_entry % hdr->man_dtable.cparam.width;

    /* Initialize information for rows skipped over */
    sect_off = iblock->block_off;
    for(u = 0; u < curr_row; u++)
        sect_off += hdr->man_dtable.row_block_size[u] * hdr->man_dtable.cparam.width;
    sect_off += hdr->man_dtable.row_block_size[curr_row] * curr_col;
#ifdef QAK
HDfprintf(stderr, "%s: sect_off = %Zu\n", FUNC, sect_off);
#endif /* QAK */

    /* Loop over the blocks to skip */
    for(u = start_entry; u < (start_entry + nentries); /* u is advanced in loop */) {
        unsigned row_entries;           /* Number of entries in a particular row */

        /* Compute number of entries in (possible partial) current row */
        row_entries = MIN(hdr->man_dtable.cparam.width - curr_col, (start_entry + nentries) - u);
#ifdef QAK
HDfprintf(stderr, "%s: u = %u\n", FUNC, u);
HDfprintf(stderr, "%s: curr_col = %u, curr_row = %u\n", FUNC, curr_col, curr_row);
HDfprintf(stderr, "%s: row_entries = %u, hdr->man_dtable.row_dblock_free[%u] = %Hu\n", FUNC, row_entries, curr_row, hdr->man_dtable.row_dblock_free[curr_row]);
#endif /* QAK */

        /* Add free space section for blocks in this row */

        /* Create free list section node for blocks skipped over */
        if(NULL == (sec_node = H5FL_MALLOC(H5HF_free_section_t)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for direct block free list section")

        /* Set section's information */
        sec_node->sect_addr = sect_off;
        sec_node->sect_size = hdr->man_dtable.row_dblock_free[curr_row];
        sec_node->type = H5HF_SECT_RANGE;
        sec_node->u.range.iblock = iblock;
        if(H5HF_iblock_incr(iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, FAIL, "can't increment reference count on shared indirect block")
        sec_node->u.range.row = curr_row;
        sec_node->u.range.col = curr_col;
        sec_node->u.range.num_entries = row_entries;

        /* Add new free space to the global list of space */
        if(H5HF_flist_add(hdr->flist, sec_node, &sec_node->sect_size, &sec_node->sect_addr) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add indirect block free space to global list")

        /* Advance row & column position */
        sect_off += row_entries * hdr->man_dtable.row_block_size[curr_row];
        curr_row++;
        curr_col = 0;           /* (first partial row aligns this) */

        /* Increment index variable */
        u += row_entries;
    } /* end for */
#ifdef QAK
HDfprintf(stderr, "%s: sect_off = %Zu\n", FUNC, sect_off);
#endif /* QAK */

    /* Advance the allocated heap size/new block iterator */
    if(H5HF_hdr_inc_alloc(hdr, sect_off, nentries) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTRELEASE, FAIL, "can't increase allocated heap size")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_skip_blocks() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_skip_ranges
 *
 * Purpose:	Add skipped indirect ranges to free space for heap
 *
 * Return:	SUCCEED/FAIL
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Apr  4 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HF_man_iblock_skip_ranges(H5HF_hdr_t *hdr, H5HF_indirect_t *iblock,
    haddr_t iblock_addr, unsigned start_entry, unsigned nentries)
{
    H5HF_free_section_t *sec_node; /* Pointer to free list section for range */
    hsize_t sect_off;                   /* Offset of free section in heap */
    size_t row_dblock_free_space;       /* Size of free space for row of direct blocks in a row */
    size_t acc_row_dblock_free_space;   /* Accumulated size of free space for row of direct blocks in a row */
    unsigned curr_row;                  /* Current row in indirect block */
    unsigned curr_col;                  /* Current column in indirect block */
    unsigned u, w;                      /* Local index variables */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_skip_ranges)
#ifdef QAK
HDfprintf(stderr, "%s: start_entry = %u, nentries = %u\n", FUNC, start_entry, nentries);
#endif /* QAK */

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(iblock);
    HDassert(H5F_addr_defined(iblock_addr));

    /* Compute starting column & row */
    curr_row = start_entry / hdr->man_dtable.cparam.width;
    curr_col = start_entry % hdr->man_dtable.cparam.width;
#ifdef QAK
HDfprintf(stderr, "%s: curr_col = %u, curr_row = %u\n", FUNC, curr_col, curr_row);
#endif /* QAK */

    /* Initialize information for rows skipped over */
    sect_off = iblock->block_off;
    for(u = 0; u < curr_row; u++)
        sect_off += hdr->man_dtable.row_block_size[u] * hdr->man_dtable.cparam.width;
    sect_off += hdr->man_dtable.row_block_size[curr_row] * curr_col;
#ifdef QAK
HDfprintf(stderr, "%s: sect_off = %Zu\n", FUNC, sect_off);
#endif /* QAK */

    /* Loop over the blocks to skip */
    for(u = start_entry; u < (start_entry + nentries); /* u is advanced in loop */) {
        unsigned row_entries;       /* Number of entries in a particular row */
        unsigned num_rows;          /* Number of rows in indirect blocks referenced */

        /* Compute number of rows in indirect blocks covered by entry */
        num_rows = (H5V_log2_of2((uint32_t)hdr->man_dtable.row_block_size[curr_row]) -
                H5V_log2_of2(hdr->man_dtable.cparam.start_block_size)) - 1;

        /* Compute number of entries in (possible partial) current row */
        row_entries = MIN(hdr->man_dtable.cparam.width - curr_col, (start_entry + nentries) - u);
#ifdef QAK
HDfprintf(stderr, "%s: u = %u\n", FUNC, u);
HDfprintf(stderr, "%s: curr_col = %u, curr_row = %u\n", FUNC, curr_col, curr_row);
HDfprintf(stderr, "%s: row_entries = %u, num_rows = %u\n", FUNC, row_entries, num_rows);
#endif /* QAK */

        /* Loop over rows in indirect blocks covered */
        acc_row_dblock_free_space = 0;
        for(w = 0; w < num_rows; w++) {

            /* Compute free space in direct blocks for this row */
            row_dblock_free_space = hdr->man_dtable.cparam.width * hdr->man_dtable.row_dblock_free[w];
            acc_row_dblock_free_space += row_dblock_free_space;
#ifdef QAK
HDfprintf(stderr, "%s: w = %u\n", FUNC, w);
HDfprintf(stderr, "%s: hdr->man_dtable.row_dblock_free[%u] = %Zu\n", FUNC, w, hdr->man_dtable.row_dblock_free[w]);
#endif /* QAK */

            /* Add "indirect" free space section for blocks in this row */

            /* Create free list section node for blocks skipped over */
            if(NULL == (sec_node = H5FL_MALLOC(H5HF_free_section_t)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for direct block free list section")

            /* Set section's information */
            sec_node->sect_addr = sect_off + hdr->man_dtable.row_block_off[w];
#ifdef QAK
HDfprintf(stderr, "%s: sec_node->sect_addr = %a\n", FUNC, sec_node->sect_addr);
#endif /* QAK */
            sec_node->sect_size = hdr->man_dtable.row_dblock_free[w];
            sec_node->type = H5HF_SECT_INDIRECT;
            sec_node->u.indirect.iblock = iblock;
            if(H5HF_iblock_incr(iblock) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, FAIL, "can't increment reference count on shared indirect block")
            sec_node->u.indirect.row = curr_row;
            sec_node->u.indirect.col = curr_col;
            sec_node->u.indirect.num_entries = row_entries;
            sec_node->u.indirect.indir_row = w;
            sec_node->u.indirect.indir_nrows = num_rows;

            /* Add new free space to the global list of space */
            if(H5HF_flist_add(hdr->flist, sec_node, &sec_node->sect_size, &sec_node->sect_addr) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add indirect block free space to global list")
        } /* end for */
#ifdef QAK
HDfprintf(stderr, "%s: acc_row_dblock_free_space = %Zu\n", FUNC, acc_row_dblock_free_space);
#endif /* QAK */

        /* Advance row & column position */
        sect_off += row_entries * hdr->man_dtable.row_block_size[curr_row];
        curr_row++;
        curr_col = 0;           /* (first partial row aligns this) */

        /* Advance outer loop index */
        u += row_entries;
    } /* end for */

    /* Advance the allocated heap size/new block iterator */
    if(H5HF_hdr_inc_alloc(hdr, sect_off, nentries) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTRELEASE, FAIL, "can't increase allocated heap size")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_skip_ranges() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_double_root
 *
 * Purpose:	Double size of root indirect block
 *
 * Return:	SUCCEED/FAIL
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Apr 17 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HF_man_iblock_double_root(H5HF_hdr_t *hdr, hid_t dxpl_id, size_t min_dblock_size)
{
    H5HF_indirect_t *iblock;    /* Pointer to root indirect block */
    haddr_t new_addr;           /* New address of indirect block */
    hsize_t acc_dblock_free;    /* Accumulated free space in direct blocks */
    hsize_t next_size;          /* The previous value of the "next size" for the new block iterator */
    unsigned next_row;          /* The next row to allocate block in */
    unsigned next_entry;        /* The previous value of the "next entry" for the new block iterator */
    unsigned new_next_entry;    /* The new value of the "next entry" for the new block iterator */
    unsigned min_nrows = 0;     /* Min. # of direct rows */
    unsigned old_nrows;         /* Old # of rows */
    unsigned new_nrows;         /* New # of rows */
    hbool_t skip_direct_rows = FALSE;   /* Whether we are skipping direct rows */
    size_t u;                   /* Local index variable */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_double_root)

#ifdef QAK
HDfprintf(stderr, "%s: Extending root indirect block\n", FUNC);
#endif /* QAK */

    /* Get "new block" iterator information */
    if(H5HF_man_iter_curr(&hdr->next_block, &next_row, NULL, &next_entry, &iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, FAIL, "unable to retrieve current block iterator location")
    next_size = hdr->man_dtable.row_block_size[next_row];

    /* Make certain the iterator is at the root indirect block */
    HDassert(iblock->parent == NULL);

    /* Keep this for later */
    old_nrows = iblock->nrows;

    /* Check for skipping over direct block rows */
    if(iblock->nrows < hdr->man_dtable.max_direct_rows && min_dblock_size > next_size) {
        /* Sanity check */
        HDassert(min_dblock_size > hdr->man_dtable.cparam.start_block_size);

        /* Set flag */
        skip_direct_rows = TRUE;

        /* Make certain we allocate at least the required row for the block requested */
        min_nrows = 1 + H5HF_dtable_size_to_row(&hdr->man_dtable, min_dblock_size);

        /* Set the information for the next block, of the appropriate size */
        new_next_entry = (min_nrows - 1) * hdr->man_dtable.cparam.width;
    } /* end if */

    /* Compute new # of rows in indirect block */
    new_nrows = MAX(min_nrows, MIN(2 * iblock->nrows, iblock->max_rows));
#ifdef QAK
HDfprintf(stderr, "%s: min_nrows = %u, new_nrows = %u\n", FUNC, min_nrows, new_nrows);
HDfprintf(stderr, "%s: iblock->nrows = %u\n", FUNC, iblock->nrows);
HDfprintf(stderr, "%s: old_next_entry = %u, iblock->next_entry = %u\n", FUNC, old_next_entry, iblock->next_entry);
#endif /* QAK */

/* Currently, the old block data is "thrown away" after the space is reallocated,
* so avoid data copy in H5MF_realloc() call by just free'ing the space and
* allocating new space.
*
* This also keeps the file smaller, by freeing the space and then
* allocating new space, instead of vice versa (in H5MF_realloc).
*
* QAK - 3/14/2006
*/
    /* Free previous indirect block disk space */
    if(H5MF_xfree(hdr->f, H5FD_MEM_FHEAP_IBLOCK, dxpl_id, iblock->addr, (hsize_t)iblock->size)<0)
        HGOTO_ERROR(H5E_STORAGE, H5E_CANTFREE, FAIL, "unable to free fractal heap indirect block")

    /* Compute size of buffer needed for new indirect block */
    iblock->nrows = new_nrows;
    iblock->size = H5HF_MAN_INDIRECT_SIZE(hdr, iblock);

    /* Allocate space for the new indirect block on disk */
    if(HADDR_UNDEF == (new_addr = H5MF_alloc(hdr->f, H5FD_MEM_FHEAP_IBLOCK, dxpl_id, (hsize_t)iblock->size)))
        HGOTO_ERROR(H5E_STORAGE, H5E_NOSPACE, FAIL, "file allocation failed for fractal heap indirect block")
#ifdef QAK
HDfprintf(stderr, "%s: new_addr = %a\n", FUNC, new_addr);
#endif /* QAK */

    /* Re-allocate direct block entry table */
    if(NULL == (iblock->ents = H5FL_SEQ_REALLOC(H5HF_indirect_ent_t, iblock->ents, (iblock->nrows * hdr->man_dtable.cparam.width))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for direct entries")

    /* Check for skipping over rows and add free section for skipped rows */
    if(skip_direct_rows) {
        /* Add skipped blocks to heap's free space */
        if(H5HF_man_iblock_skip_blocks(hdr, iblock, new_addr,
                next_entry, (new_next_entry - next_entry)) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, FAIL, "can't add skipped blocks to heap's free space")
    } /* end if */

    /* Initialize new direct block entries in rows added */
    acc_dblock_free = 0;
    for(u = (old_nrows * hdr->man_dtable.cparam.width); u < (iblock->nrows * hdr->man_dtable.cparam.width); u++) {
        unsigned row = u / hdr->man_dtable.cparam.width;        /* Row for current entry */

        iblock->ents[u].addr = HADDR_UNDEF;
        iblock->ents[u].free_space = hdr->man_dtable.row_dblock_free[row];
        iblock->child_free_space += iblock->ents[u].free_space;
        acc_dblock_free += iblock->ents[u].free_space;
    } /* end for */

    /* Mark indirect block as dirty */
    if(H5HF_iblock_dirty(iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark indirect block as dirty")

    /* Move object in cache */
    if(H5AC_rename(hdr->f, H5AC_FHEAP_IBLOCK, iblock->addr, new_addr) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTSPLIT, FAIL, "unable to move fractal heap root indirect block")

    /* Update other shared header info */
    hdr->man_dtable.curr_root_rows = new_nrows;
    hdr->man_dtable.table_addr = new_addr;

    /* Extend heap to cover new root indirect block */
#ifdef QAK
HDfprintf(stderr, "%s: hdr->man_dtable.row_block_off[new_nrows - 1] = %Hu\n", FUNC, hdr->man_dtable.row_block_off[new_nrows - 1]);
HDfprintf(stderr, "%s: hdr->man_dtable.row_block_off[new_nrows] = %Hu\n", FUNC, hdr->man_dtable.row_block_off[new_nrows]);
HDfprintf(stderr, "%s: acc_dblock_free = %Hu\n", FUNC, acc_dblock_free);
#endif /* QAK */
    if(H5HF_hdr_extend_heap(hdr, 2 * hdr->man_dtable.row_block_off[new_nrows - 1], acc_dblock_free) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTEXTEND, FAIL, "can't increase space to cover root direct block")

    /* Mark heap header as modified */
    if(H5HF_hdr_dirty(hdr) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark header as dirty")

    /* Lock root indirect block (again) */
    if(NULL == (iblock = H5HF_man_iblock_protect(hdr, dxpl_id, new_addr, hdr->man_dtable.curr_root_rows, NULL, 0, H5AC_WRITE)))
        HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to protect fractal heap indirect block")
    iblock->addr = new_addr;

    /* Update the indirect block pointer in iterator */
    /* (pins the indirect block after it's in the new location) */
    if(H5HF_man_iter_update_iblock(&hdr->next_block, iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTMODIFY, FAIL, "unable to update indirect block for block iterator")

    /* Release the indirect block (marked as dirty) */
    if(H5AC_unprotect(hdr->f, dxpl_id, H5AC_FHEAP_IBLOCK, iblock->addr, iblock, H5AC__DIRTIED_FLAG) < 0)
        HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap indirect block")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_double_root() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_place_dblock
 *
 * Purpose:	Find indirect block with location for placing a direct block
 *
 * Note:	Creates necessary indirect blocks
 *
 * Return:	Pointer to indirect block on success, NULL on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Mar 14 2006
 *
 *-------------------------------------------------------------------------
 */
H5HF_indirect_t *
H5HF_man_iblock_place_dblock(H5HF_hdr_t *hdr, hid_t dxpl_id, size_t min_dblock_size,
    size_t *entry_p, size_t *dblock_size)
{
    H5HF_indirect_t *iblock;            /* Pointer to indirect block */
    haddr_t iblock_addr;                /* Indirect block's address */
    H5HF_indirect_t *ret_value;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_place_dblock)
#ifdef QAK
HDfprintf(stderr, "%s: min_dblock_size = %Zu\n", FUNC, min_dblock_size);
#endif /* QAK */

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(min_dblock_size > 0);

    /* Check for creating first indirect block */
    if(hdr->man_dtable.curr_root_rows == 0) {
        H5HF_direct_t *dblock;          /* Pointer to direct block to query */
        hsize_t acc_dblock_free;        /* Accumulated free space in direct blocks */
        hbool_t have_direct_block;      /* Flag to indicate a direct block already exists */
        unsigned nrows;                 /* Number of rows for root indirect block */
        unsigned u;                     /* Local index variable */

#ifdef QAK
HDfprintf(stderr, "%s: creating first indirect block\n", FUNC);
#endif /* QAK */
        /* Check for allocating entire root indirect block initially */
        if(hdr->man_dtable.cparam.start_root_rows == 0)
            nrows = hdr->man_dtable.max_root_rows;
        else {
            unsigned rows_needed;   /* Number of rows needed to get to direct block size */
            unsigned block_row_off; /* Row offset from larger block sizes */

            nrows = hdr->man_dtable.cparam.start_root_rows;

            block_row_off = H5V_log2_of2(min_dblock_size) - H5V_log2_of2(hdr->man_dtable.cparam.start_block_size);
            if(block_row_off > 0)
                block_row_off++;        /* Account for the pair of initial rows of the initial block size */
            rows_needed = 1 + block_row_off;
            if(nrows < rows_needed)
                nrows = rows_needed;
        } /* end else */
#ifdef QAK
HDfprintf(stderr, "%s: nrows = %u\n", FUNC, nrows);
#endif /* QAK */

        /* Allocate root indirect block */
        if(H5HF_man_iblock_create(hdr, dxpl_id, (hsize_t)0, nrows, hdr->man_dtable.max_root_rows, &iblock_addr) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, NULL, "can't allocate fractal heap indirect block")
#ifdef QAK
HDfprintf(stderr, "%s: iblock_addr = %a\n", FUNC, iblock_addr);
#endif /* QAK */

        /* Move current direct block (used as root) into new indirect block */

        /* Lock new indirect block */
        if(NULL == (iblock = H5HF_man_iblock_protect(hdr, dxpl_id, iblock_addr, nrows, NULL, 0, H5AC_WRITE)))
            HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, NULL, "unable to protect fractal heap indirect block")

        /* Check if there's already a direct block as root) */
        have_direct_block = H5F_addr_defined(hdr->man_dtable.table_addr);
#ifdef QAK
HDfprintf(stderr, "%s: have_direct_block = %u\n", FUNC, (unsigned)have_direct_block);
#endif /* QAK */
        if(have_direct_block) {
            /* Lock first (root) direct block */
            if(NULL == (dblock = H5HF_man_dblock_protect(hdr, dxpl_id, hdr->man_dtable.table_addr, hdr->man_dtable.cparam.start_block_size, iblock, 0, H5AC_WRITE)))
                HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, NULL, "unable to protect fractal heap direct block")

            /* Point indirect block at direct block to add */
            iblock->child_free_space += (hssize_t)(dblock->blk_free_space - iblock->ents[0].free_space);
            iblock->ents[0].addr = hdr->man_dtable.table_addr;
            iblock->ents[0].free_space = dblock->blk_free_space;

            /* Make direct block share parent indirect block */
            dblock->parent = iblock;
            dblock->par_entry = 0;
            if(H5HF_iblock_incr(iblock) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, NULL, "can't increment reference count on shared indirect block")

            /* Unlock first (root) direct block */
            if(H5AC_unprotect(hdr->f, dxpl_id, H5AC_FHEAP_DBLOCK, hdr->man_dtable.table_addr, dblock, H5AC__NO_FLAGS_SET) < 0)
                HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, NULL, "unable to release fractal heap direct block")
            dblock = NULL;
        } /* end if */

        /* Set up iterator at correct location */
        if(H5HF_man_iter_start_entry(hdr, &hdr->next_block, iblock, have_direct_block) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, NULL, "can't initialize block iterator")

        /* Check for skipping over direct blocks, in order to get to large enough block */
        if(min_dblock_size > hdr->man_dtable.cparam.start_block_size) {
            /* Add skipped blocks to heap's free space */
            if(H5HF_man_iblock_skip_blocks(hdr, iblock, iblock_addr,
                    have_direct_block, ((nrows - 1) * hdr->man_dtable.cparam.width) - have_direct_block) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, NULL, "can't add skipped blocks to heap's free space")
        } /* end if */

        /* Mark indirect block as modified */
        if(H5HF_iblock_dirty(iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, NULL, "can't mark indirect block as dirty")

        /* Unprotect root indirect block (it's pinned by the iterator though) */
        if(H5AC_unprotect(hdr->f, dxpl_id, H5AC_FHEAP_IBLOCK, iblock->addr, iblock, H5AC__DIRTIED_FLAG) < 0)
            HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, NULL, "unable to release fractal heap indirect block")
        iblock = NULL;

        /* Point heap header at new indirect block */
        hdr->man_dtable.curr_root_rows = nrows;
        hdr->man_dtable.table_addr = iblock_addr;

        /* Compute free space in direct blocks referenced from entries in root indirect block */
        acc_dblock_free = 0;
        for(u = 0; u < nrows; u++)
            acc_dblock_free += hdr->man_dtable.row_dblock_free[u] * hdr->man_dtable.cparam.width;

        /* Account for potential initial direct block */
        if(have_direct_block)
            acc_dblock_free -= hdr->man_dtable.row_dblock_free[0];

        /* Extend heap to cover new root indirect block */
        if(H5HF_hdr_extend_heap(hdr, hdr->man_dtable.row_block_off[nrows], acc_dblock_free) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTEXTEND, NULL, "can't increase space to cover root direct block")

        /* Mark heap header as modified */
        if(H5HF_hdr_dirty(hdr) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, NULL, "can't mark header as dirty")
    } /* end if */
    else {
        hbool_t walked_up, walked_down; /* Condition variables for finding direct block location */
        unsigned next_row;              /* Iterator's next block row */
        unsigned next_entry;            /* Iterator's next block entry */
        unsigned min_dblock_row;        /* Minimum row for direct block size request */

#ifdef QAK
HDfprintf(stderr, "%s: searching root indirect block\n", FUNC);
#endif /* QAK */
        /* Compute min. row for direct block requested */
        min_dblock_row = H5HF_dtable_size_to_row(&hdr->man_dtable, min_dblock_size);
#ifdef QAK
HDfprintf(stderr, "%s: min_dblock_size = %Zu, min_dblock_row = %u\n", FUNC, min_dblock_size, min_dblock_row);
#endif /* QAK */

        /* Initialize block iterator, if necessary */
        if(!H5HF_man_iter_ready(&hdr->next_block)) {
#ifdef QAK
HDfprintf(stderr, "%s: hdr->man_alloc_size = %Hu\n", FUNC, hdr->man_alloc_size);
#endif /* QAK */
            /* Start iterator with offset of allocated space */
            if(H5HF_man_iter_start_offset(hdr, dxpl_id, &hdr->next_block, hdr->man_alloc_size) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, NULL, "unable to set block iterator location")
        } /* end if */

        /* Get information about current iterator location */
        if(H5HF_man_iter_curr(&hdr->next_block, &next_row, NULL,
                &next_entry, &iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, NULL, "unable to retrieve current block iterator location")

#ifdef QAK
HDfprintf(stderr, "%s: Check 1.0\n", FUNC);
HDfprintf(stderr, "%s: iblock = %p\n", FUNC, iblock);
HDfprintf(stderr, "%s: iblock->nrows = %u\n", FUNC, iblock->nrows);
HDfprintf(stderr, "%s: next_row = %u\n", FUNC, next_row);
HDfprintf(stderr, "%s: next_entry = %u\n", FUNC, next_entry);
#endif /* QAK */
        /* Check for skipping over blocks in the current block */
        if(min_dblock_row > next_row) {
            unsigned min_entry;         /* Min entry for direct block requested */
            unsigned skip_entries;      /* Number of entries to skip in the current block */

            /* Compute the number of entries to skip in the current block */
            min_entry = min_dblock_row * hdr->man_dtable.cparam.width;
            if(min_dblock_row >= iblock->nrows)
                skip_entries = (iblock->nrows * hdr->man_dtable.cparam.width) - next_entry;
            else
                skip_entries = min_entry - next_entry;
#ifdef QAK
HDfprintf(stderr, "%s: min_entry = %u, skip_entries = %u\n", FUNC, min_entry, skip_entries);
#endif /* QAK */

            /* Add skipped direct blocks to heap's free space */
            if(H5HF_man_iblock_skip_blocks(hdr, iblock, iblock->addr, next_entry, skip_entries) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, NULL, "can't add skipped blocks to heap's free space")

            /* Get information about new iterator location */
            if(H5HF_man_iter_curr(&hdr->next_block, &next_row, NULL,
                    &next_entry, &iblock) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, NULL, "unable to retrieve current block iterator location")
        } /* end if */
#ifdef QAK
HDfprintf(stderr, "%s: Check 2.0\n", FUNC);
HDfprintf(stderr, "%s: iblock = %p\n", FUNC, iblock);
HDfprintf(stderr, "%s: iblock->nrows = %u\n", FUNC, iblock->nrows);
HDfprintf(stderr, "%s: next_row = %u\n", FUNC, next_row);
HDfprintf(stderr, "%s: next_entry = %u\n", FUNC, next_entry);
#endif /* QAK */

        do {
            /* Reset conditions for leaving loop */
            walked_up = walked_down = FALSE;

            /* Check for walking off end of indirect block */
            /* (walk up iterator) */
            while(next_row >= iblock->nrows) {
#ifdef QAK
HDfprintf(stderr, "%s: Off the end of a block\n", FUNC);
#endif /* QAK */
                /* Check for needing to expand root indirect block */
                if(iblock->parent == NULL) {
#ifdef QAK
HDfprintf(stderr, "%s: Doubling root block\n", FUNC);
#endif /* QAK */
                    if(H5HF_man_iblock_double_root(hdr, dxpl_id, min_dblock_size) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTEXTEND, NULL, "unable to double root indirect block")
                } /* end if */
                else {
#ifdef QAK
HDfprintf(stderr, "%s: Walking up a level\n", FUNC);
#endif /* QAK */
                    /* Move iterator up one level */
                    if(H5HF_man_iter_up(&hdr->next_block) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTNEXT, NULL, "unable to advance current block iterator location")

                    /* Increment location of next block at this level */
                    if(H5HF_man_iter_next(hdr, &hdr->next_block, 1) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, NULL, "can't advance fractal heap block location")
                } /* end else */

                /* Get information about new iterator location */
                if(H5HF_man_iter_curr(&hdr->next_block, &next_row, NULL,
                        &next_entry, &iblock) < 0)
                    HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, NULL, "unable to retrieve current block iterator location")

                /* Indicate that we walked up */
                walked_up = TRUE;
            } /* end if */
#ifdef QAK
HDfprintf(stderr, "%s: Check 3.0\n", FUNC);
HDfprintf(stderr, "%s: iblock = %p\n", FUNC, iblock);
HDfprintf(stderr, "%s: iblock->nrows = %u\n", FUNC, iblock->nrows);
HDfprintf(stderr, "%s: next_row = %u\n", FUNC, next_row);
HDfprintf(stderr, "%s: next_entry = %u\n", FUNC, next_entry);
#endif /* QAK */

            /* Check for walking into child indirect block */
            /* (walk down iterator) */
            if(next_row >= hdr->man_dtable.max_direct_rows) {
                hsize_t next_size;      /* Size of next direct block to create */
                unsigned child_nrows;   /* Number of rows in new indirect block */

#ifdef QAK
HDfprintf(stderr, "%s: Walking down into child indirect block\n", FUNC);
#endif /* QAK */
#ifdef QAK
HDfprintf(stderr, "%s: Check 3.1\n", FUNC);
HDfprintf(stderr, "%s: iblock = %p\n", FUNC, iblock);
HDfprintf(stderr, "%s: iblock->nrows = %u\n", FUNC, iblock->nrows);
HDfprintf(stderr, "%s: next_row = %u\n", FUNC, next_row);
HDfprintf(stderr, "%s: next_entry = %u\n", FUNC, next_entry);
#endif /* QAK */
                HDassert(!H5F_addr_defined(iblock->ents[next_entry].addr));

                /* Compute # of rows in next child indirect block to use */
                next_size = hdr->man_dtable.row_block_size[next_row];
                child_nrows = (H5V_log2_gen(next_size) - hdr->man_dtable.first_row_bits) + 1;
#ifdef QAK
HDfprintf(stderr, "%s: child_nrows = %u\n", FUNC, child_nrows);
#endif /* QAK */

                /* Check for skipping over indirect blocks */
                /* (that don't have direct blocks large enough to hold direct block size requested) */
                if(hdr->man_dtable.row_block_size[child_nrows - 1] < min_dblock_size) {
                    unsigned child_rows_needed;     /* Number of rows needed to hold direct block */
                    unsigned child_entry;           /* Entry of child indirect block */

#ifdef QAK
HDfprintf(stderr, "%s: Skipping indirect block row that is too small\n", FUNC);
#endif /* QAK */
                    /* Compute # of rows needed in child indirect block */
                    child_rows_needed = (H5V_log2_of2(min_dblock_size) - H5V_log2_of2(hdr->man_dtable.cparam.start_block_size)) + 2;
                    HDassert(child_rows_needed > child_nrows);
                    child_entry = (next_row + (child_rows_needed - child_nrows)) * hdr->man_dtable.cparam.width;
#ifdef QAK
HDfprintf(stderr, "%s: child_rows_needed = %u\n", FUNC, child_rows_needed);
HDfprintf(stderr, "%s: child_entry = %u\n", FUNC, child_entry);
#endif /* QAK */

                    /* Add skipped indirect ranges to heap's free space */
                    if(H5HF_man_iblock_skip_ranges(hdr, iblock, iblock->addr, next_entry, (child_entry - next_entry)) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, NULL, "can't add skipped blocks to heap's free space")
                } /* end if */
                else {
                    H5HF_indirect_t *new_iblock;    /* Pointer to new indirect block */
                    hsize_t new_iblock_off;         /* Direct block offset in heap address space */
                    haddr_t new_iblock_addr;        /* New indirect block's address */

#ifdef QAK
HDfprintf(stderr, "%s: Allocating new child indirect block\n", FUNC);
#endif /* QAK */
                    /* Compute the direct block's offset in the heap's address space */
                    new_iblock_off = iblock->block_off;
                    new_iblock_off += hdr->man_dtable.row_block_off[next_entry / hdr->man_dtable.cparam.width];
                    new_iblock_off += hdr->man_dtable.row_block_size[next_entry / hdr->man_dtable.cparam.width] * (next_entry % hdr->man_dtable.cparam.width);

                    /* Allocate new indirect block */
                    if(H5HF_man_iblock_create(hdr, dxpl_id, new_iblock_off, child_nrows, child_nrows, &new_iblock_addr) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, NULL, "can't allocate fractal heap indirect block")

                    /* Lock new indirect block */
                    if(NULL == (new_iblock = H5HF_man_iblock_protect(hdr, dxpl_id, new_iblock_addr, child_nrows, iblock, next_entry, H5AC_WRITE)))
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, NULL, "unable to protect fractal heap indirect block")

                    /* Set parent information */
                    HDassert(new_iblock->parent == NULL);
                    new_iblock->parent = iblock;
                    new_iblock->par_entry = next_entry;
                    if(H5HF_iblock_incr(iblock) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, NULL, "can't increment reference count on shared indirect block")

                    /* Point current indirect block at new indirect block */
                    iblock->ents[next_entry].addr = new_iblock_addr;

                    /* Move iterator down one level */
                    if(H5HF_man_iter_down(&hdr->next_block, new_iblock) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTNEXT, NULL, "unable to advance current block iterator location")

                    /* Get information about new iterator location */
                    if(H5HF_man_iter_curr(&hdr->next_block, &next_row, NULL,
                            &next_entry, NULL) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, NULL, "unable to retrieve current block iterator location")
                    next_size = hdr->man_dtable.row_block_size[next_row];
#ifdef QAK
HDfprintf(stderr, "%s: next_row = %u\n", FUNC, next_row);
HDfprintf(stderr, "%s: next_entry = %u\n", FUNC, next_entry);
#endif /* QAK */

                    /* Check for skipping over rows and add free section for skipped rows */
                    if(min_dblock_size > next_size) {
                        unsigned new_entry;        /* Entry of direct block which is large enough */

                        /* Compute entry for direct block size requested */
                        new_entry = hdr->man_dtable.cparam.width * min_dblock_row;
#ifdef QAK
HDfprintf(stderr, "%s: Skipping rows in new child indirect block - new_entry = %u\n", FUNC, new_entry);
#endif /* QAK */

                        /* Add skipped blocks to heap's free space */
                        if(H5HF_man_iblock_skip_blocks(hdr, new_iblock, new_iblock->addr, 0, new_entry) < 0)
                            HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, NULL, "can't add skipped blocks to heap's free space")
                    } /* end if */

                    /* Mark new indirect block as modified */
                    if(H5HF_iblock_dirty(new_iblock) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, NULL, "can't mark indirect block as dirty")

                    /* Mark current indirect block as modified */
                    if(H5HF_iblock_dirty(iblock) < 0)
                        HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, NULL, "can't mark indirect block as dirty")

                    /* Unprotect child indirect block */
                    if(H5AC_unprotect(hdr->f, dxpl_id, H5AC_FHEAP_IBLOCK, new_iblock->addr, new_iblock, H5AC__DIRTIED_FLAG) < 0)
                        HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, NULL, "unable to release fractal heap indirect block")
                } /* end else */

                /* Get information about new iterator location */
                if(H5HF_man_iter_curr(&hdr->next_block, &next_row, NULL,
                        &next_entry, &iblock) < 0)
                    HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, NULL, "unable to retrieve current block iterator location")

                /* Indicate that we walked down */
                walked_down = TRUE;
            } /* end while */
        } while(walked_down || walked_up);
    } /* end else */

    /* Get information about iterator location */
{
    unsigned next_row;          /* Iterator's next block row */
    unsigned next_entry;        /* Iterator's next block entry */
    size_t next_size;           /* Size of next direct block to create */

    if(H5HF_man_iter_curr(&hdr->next_block, &next_row, NULL,
            &next_entry, &iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTGET, NULL, "unable to retrieve current block iterator location")
    HDassert(next_row < iblock->nrows);
    next_size = hdr->man_dtable.row_block_size[next_row];

    /* Check for skipping over blocks */
    if(min_dblock_size > next_size) {
HDfprintf(stderr, "%s: Skipping direct block sizes not supported, min_dblock_size = %Zu, next_size = %Zu\n", FUNC, min_dblock_size, next_size);
HGOTO_ERROR(H5E_HEAP, H5E_UNSUPPORTED, NULL, "skipping direct block sizes not supported yet")
    } /* end if */

    /* Set entry for new direct block to use */
    *entry_p = next_entry;

    /* Set size of direct block to create */
    *dblock_size = next_size;

#ifdef OLD_WAY
    /* Increment location of next block from this indirect block */
    if(H5HF_man_iter_next(hdr, &hdr->next_block, 1) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, NULL, "can't advance fractal heap block location")
#endif /* OLD_WAY */

    /* Set return value */
    ret_value = iblock;
}

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_place_dblock() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_alloc_range
 *
 * Purpose:	Allocate a "single" section for an object, out of a "range"
 *              section
 *
 * Note:	Creates necessary direct & indirect blocks
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Mar 28 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF_man_iblock_alloc_range(H5HF_hdr_t *hdr, hid_t dxpl_id,
    H5HF_free_section_t **sec_node)
{
    H5HF_indirect_t *iblock;            /* Pointer to indirect block */
    haddr_t dblock_addr;                /* Direct block's address */
    H5HF_free_section_t *dblock_sec_node = NULL;     /* Pointer to direct block's section node */
    H5HF_free_section_t *old_sec_node = *sec_node;     /* Pointer to old section node */
    unsigned cur_entry;                 /* Current entry in indirect block */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_alloc_range)

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(sec_node && *sec_node);

    /* Compute info about range */
    cur_entry = (old_sec_node->u.range.row * hdr->man_dtable.cparam.width) + old_sec_node->u.range.col;

    /* Check for range covering indirect blocks */
    if(old_sec_node->u.range.row >= hdr->man_dtable.max_direct_rows) {
HDfprintf(stderr, "%s: Can't handle range sections over indirect blocks yet\n", FUNC);
HGOTO_ERROR(H5E_HEAP, H5E_UNSUPPORTED, FAIL, "'range' free space sections over indirect blocks not supported yet")
    } /* end if */

    /* Get a pointer to the indirect block covering the range */
    iblock = old_sec_node->u.range.iblock;
    HDassert(iblock);

#ifdef QAK
HDfprintf(stderr, "%s: cur_entry = %u\n", FUNC, cur_entry);
HDfprintf(stderr, "%s: old_sec_node->u.range.num_entries = %u\n", FUNC, old_sec_node->u.range.num_entries);
#endif /* QAK */
#ifdef QAK
HDfprintf(stderr, "%s: hdr->man_dtable.row_block_size[old_sec_node->u.range.row] = %Hu\n", FUNC, hdr->man_dtable.row_block_size[old_sec_node->u.range.row]);
HDfprintf(stderr, "%s: old_sec_node->sect_addr = %a\n", FUNC, old_sec_node->sect_addr);
#endif /* QAK */
    /* Create direct block of appropriate size */
    if(H5HF_man_dblock_create(dxpl_id, hdr, iblock, cur_entry, (size_t)hdr->man_dtable.row_block_size[old_sec_node->u.range.row], (hsize_t)old_sec_node->sect_addr, &dblock_addr, &dblock_sec_node) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, FAIL, "can't allocate fractal heap direct block")

    /* Hook direct block up to indirect block */
    iblock->ents[cur_entry].addr = dblock_addr;

    /* Mark indirect block as dirty */
    if(H5HF_iblock_dirty(iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark indirect block as dirty")

    /* Check for only single block covered in range section */
    if(old_sec_node->u.range.num_entries == 1) {
        /* Drop reference count on indirect block that free section is in */
        if(H5HF_iblock_decr(iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, FAIL, "can't decrement reference count on shared indirect block")

        /* Free section structure */
        H5FL_FREE(H5HF_free_section_t, old_sec_node);
    } /* end if */
    else {
        /* Adjust section information */
        old_sec_node->sect_addr += hdr->man_dtable.row_block_size[old_sec_node->u.range.row];

        /* Adjust range information */
        old_sec_node->u.range.col++;
        old_sec_node->u.range.num_entries--;

        /* Add section back to free space list */
        if(H5HF_flist_add(hdr->flist, old_sec_node, &old_sec_node->sect_size, &old_sec_node->sect_addr) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add indirect block free space to global list")
    } /* end else */

    /* Point 'sec_node' at new direct block section node */
    *sec_node = dblock_sec_node;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_alloc_range() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_alloc_indirect
 *
 * Purpose:	Allocate a "single" section for an object, out of an
 *              "indirect" section, possibly creating "range" section as a
 *              byproduct.
 *
 * Note:	Creates necessary direct & indirect blocks
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Apr  4 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF_man_iblock_alloc_indirect(H5HF_hdr_t *hdr, hid_t dxpl_id,
    H5HF_free_section_t **sec_node)
{
    H5HF_indirect_t *iblock;            /* Pointer to indirect block */
    H5HF_indirect_t *child_iblock;      /* Pointer to child indirect block */
    haddr_t child_iblock_addr;          /* Address of child indirect block */
    haddr_t dblock_addr;                /* New direct block's address */
    H5HF_free_section_t *dblock_sec_node = NULL;   /* Pointer to direct block's section node */
    H5HF_free_section_t *range_sec_node = NULL;    /* Pointer to new range section node */
    H5HF_free_section_t *old_sec_node = *sec_node; /* Pointer to old indirect section node */
    unsigned curr_entry;                /* Current entry in indirect block */
    unsigned dblock_entry;              /* Entry of direct block in child indirect block */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_alloc_indirect)

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(sec_node && *sec_node);

    /* Compute info about range */
    curr_entry = (old_sec_node->u.indirect.row * hdr->man_dtable.cparam.width) + old_sec_node->u.indirect.col;

    /* Get a pointer to the indirect block covering the section */
    iblock = old_sec_node->u.indirect.iblock;

#ifdef QAK
HDfprintf(stderr, "%s: curr_entry = %u\n", FUNC, curr_entry);
HDfprintf(stderr, "%s: iblock->ents[curr_entry].addr = %a\n", FUNC, iblock->ents[curr_entry].addr);
HDfprintf(stderr, "%s: iblock->ents[curr_entry].free_space = %Hu\n", FUNC, iblock->ents[curr_entry].free_space);
HDfprintf(stderr, "%s: old_sec_node->u.indirect.indir_nrows = %u\n", FUNC, old_sec_node->u.indirect.indir_nrows);
HDfprintf(stderr, "%s: old_sec_node->u.indirect.num_entries = %u\n", FUNC, old_sec_node->u.indirect.num_entries);
#endif /* QAK */

    /* Check if indirect block for this indirect section has already been created */
    if(H5F_addr_defined(iblock->ents[curr_entry].addr)) {
        /* Look up existing child indirect block */
        child_iblock_addr = iblock->ents[curr_entry].addr;
        if(NULL == (child_iblock = H5HF_man_iblock_protect(hdr, dxpl_id, child_iblock_addr, old_sec_node->u.indirect.indir_nrows, iblock, curr_entry, H5AC_WRITE)))
            HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to protect fractal heap indirect block")
    } /* end if */
    else {
        hsize_t new_iblock_off;         /* Offset of new indirect block */

        /* Compute heap offset of new indirect block */
        new_iblock_off = iblock->block_off + 
            hdr->man_dtable.row_block_off[old_sec_node->u.indirect.row] +
            (old_sec_node->u.indirect.col * 
                hdr->man_dtable.row_block_size[old_sec_node->u.indirect.row]);
#ifdef QAK
HDfprintf(stderr, "%s: iblock->block_off = %Hu\n", FUNC, iblock->block_off);
HDfprintf(stderr, "%s: new_iblock_off = %Hu\n", FUNC, new_iblock_off);
#endif /* QAK */

        /* Create child indirect block */
        if(H5HF_man_iblock_create(hdr, dxpl_id, new_iblock_off, old_sec_node->u.indirect.indir_nrows, old_sec_node->u.indirect.indir_nrows, &child_iblock_addr) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, FAIL, "can't allocate fractal heap indirect block")

        /* Lock new child indirect block */
        if(NULL == (child_iblock = H5HF_man_iblock_protect(hdr, dxpl_id, child_iblock_addr, old_sec_node->u.indirect.indir_nrows, iblock, curr_entry, H5AC_WRITE)))
            HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to protect fractal heap indirect block")

        /* Set parent information */
        HDassert(child_iblock->parent == NULL);
        child_iblock->parent = iblock;
        child_iblock->par_entry = curr_entry;
        if(H5HF_iblock_incr(iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, FAIL, "can't increment reference count on shared indirect block")
#ifdef QAK
HDfprintf(stderr, "%s: child_iblock->child_free_space = %Hu\n", FUNC, child_iblock->child_free_space);
#endif /* QAK */

        /* Hook child up to parent indirect block */
        iblock->ents[curr_entry].addr = child_iblock_addr;
        HDassert(iblock->ents[curr_entry].free_space == child_iblock->child_free_space);

        /* Mark parent indirect block as modified */
        if(H5HF_iblock_dirty(iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark indirect block as dirty")
    } /* end else */

    /* Compute entry for new direct block in child indirect block */
    dblock_entry = old_sec_node->u.indirect.indir_row * hdr->man_dtable.cparam.width;

    /* Create direct block of correct size */
#ifdef QAK
HDfprintf(stderr, "%s: old_sec_node->u.indirect.indir_row = %u\n", FUNC, old_sec_node->u.indirect.indir_row);
HDfprintf(stderr, "%s: hdr->man_dtable.row_block_size[old_sec_node->u.indirect.indir_row] = %Hu\n", FUNC, hdr->man_dtable.row_block_size[old_sec_node->u.indirect.indir_row]);
HDfprintf(stderr, "%s: old_sec_node->sect_addr = %a\n", FUNC, old_sec_node->sect_addr);
#endif /* QAK */
    if(H5HF_man_dblock_create(dxpl_id, hdr, child_iblock, dblock_entry, (size_t)hdr->man_dtable.row_block_size[old_sec_node->u.indirect.indir_row], (hsize_t)old_sec_node->sect_addr, &dblock_addr, &dblock_sec_node) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, FAIL, "can't allocate fractal heap direct block")

    /* Hook direct block up to child indirect block */
    child_iblock->ents[dblock_entry].addr = dblock_addr;

    /* Mark child indirect block as modified */
    if(H5HF_iblock_dirty(child_iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark indirect block as dirty")


    /* Create "range" section for other direct blocks in row of child indirect block */

    /* Create free list section node for blocks skipped over */
    if(NULL == (range_sec_node = H5FL_MALLOC(H5HF_free_section_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for direct block free list section")

    /* Set section's information */
    range_sec_node->sect_addr = child_iblock->block_off + hdr->man_dtable.row_block_off[old_sec_node->u.indirect.indir_row]
            + hdr->man_dtable.row_block_size[old_sec_node->u.indirect.indir_row];
    range_sec_node->sect_size = old_sec_node->sect_size;
    range_sec_node->type = H5HF_SECT_RANGE;
    range_sec_node->u.range.iblock = child_iblock;
    if(H5HF_iblock_incr(child_iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, FAIL, "can't increment reference count on shared indirect block")
    range_sec_node->u.range.row = old_sec_node->u.indirect.indir_row;
    range_sec_node->u.range.col = 1;
    range_sec_node->u.range.num_entries = hdr->man_dtable.cparam.width - 1;

    /* Add new free space to the global list of space */
    if(H5HF_flist_add(hdr->flist, range_sec_node, &range_sec_node->sect_size, &range_sec_node->sect_addr) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add indirect block free space to global list")


    /* Reduce "indirect" section */

    /* Check for only single block covered in range section */
    if(old_sec_node->u.indirect.num_entries == 1) {
        /* Drop reference count on indirect block that free section is in */
        if(H5HF_iblock_decr(iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, FAIL, "can't decrement reference count on shared indirect block")

        /* Free section structure */
        H5FL_FREE(H5HF_free_section_t, old_sec_node);
    } /* end if */
    else {
        /* Adjust section information */
        old_sec_node->sect_addr += hdr->man_dtable.row_block_size[old_sec_node->u.indirect.row];

        /* Adjust range information */
        old_sec_node->u.indirect.col++;
        old_sec_node->u.indirect.num_entries--;

        /* Add section back to free space list */
        if(H5HF_flist_add(hdr->flist, old_sec_node, &old_sec_node->sect_size, &old_sec_node->sect_addr) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add indirect block free space to global list")
    } /* end else */

    /* Release the child indirect block (marked as dirty) */
    if(H5AC_unprotect(hdr->f, dxpl_id, H5AC_FHEAP_IBLOCK, child_iblock_addr, child_iblock, H5AC__DIRTIED_FLAG) < 0)
        HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap indirect block")

    /* Point 'sec_node' at new direct block section node */
    *sec_node = dblock_sec_node;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_alloc_indirect() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_alloc_opaque
 *
 * Purpose:	Break up an opaque section into component sections
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Apr 25 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5HF_man_iblock_alloc_opaque(H5HF_hdr_t *hdr, hid_t dxpl_id,
    H5HF_free_section_t **sec_node)
{
    H5HF_indirect_t *iblock;            /* Pointer to indirect block */
    H5HF_free_section_t *old_sec_node = *sec_node;     /* Pointer to old section node */
    haddr_t child_addr;                 /* Child block's address */
    unsigned entry;                     /* Entry of child block for section */
    unsigned row;                       /* Row of child block for section */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_alloc_opaque)

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(sec_node && *sec_node);

    /* Get a pointer to the indirect block covering the section */
    iblock = old_sec_node->u.opaque.iblock;
    HDassert(iblock);

    /* Compute info about child block */
    entry = old_sec_node->u.opaque.entry;
    row = entry / hdr->man_dtable.cparam.width;
    child_addr = iblock->ents[entry].addr;

    /* Check if this section's child block is direct or indirect */
    if(row < hdr->man_dtable.max_direct_rows) {
        H5HF_direct_t *child_dblock;    /* Direct child block */
        size_t dblock_size;             /* Direct block's size */

        /* Compute direct block info */
        dblock_size = hdr->man_dtable.row_block_size[row];

        /* Check whether direct block exists yet */
        if(H5F_addr_defined(child_addr)) {
            /* Lock child direct block */
            /* (also parses it's free space sections) */
            if(NULL == (child_dblock = H5HF_man_dblock_protect(hdr, dxpl_id, child_addr, dblock_size, iblock, entry, H5AC_WRITE)))
                HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to protect fractal heap direct block")

            /* Unlock child direct block */
            if(H5AC_unprotect(hdr->f, dxpl_id, H5AC_FHEAP_DBLOCK, child_addr, child_dblock, H5AC__NO_FLAGS_SET) < 0)
                HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap direct block")
        } /* end if */
        else {
            haddr_t dblock_addr;        /* Address of direct block created */

            /* Create direct block of appropriate size */
            if(H5HF_man_dblock_create(dxpl_id, hdr, iblock, entry, dblock_size, (hsize_t)old_sec_node->sect_addr, &dblock_addr, NULL) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTALLOC, FAIL, "can't allocate fractal heap direct block")

            /* Hook direct block up to indirect block */
            iblock->ents[entry].addr = dblock_addr;

            /* Mark indirect block as dirty */
            if(H5HF_iblock_dirty(iblock) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTDIRTY, FAIL, "can't mark indirect block as dirty")
        } /* end else */
    } /* end if */
    else {
        H5HF_indirect_t *child_iblock;  /* Indirect child block */
        size_t iblock_nrows;            /* Indirect block's size */

        /* Compute indirect block info */
        iblock_nrows = (H5V_log2_gen(hdr->man_dtable.row_block_size[row]) - hdr->man_dtable.first_row_bits) + 1;

        /* Check whether direct block exists yet */
        if(H5F_addr_defined(child_addr)) {
            /* Lock child indirect block */
            /* (also parses it's free space sections) */
            if(NULL == (child_iblock = H5HF_man_iblock_protect(hdr, dxpl_id, child_addr, iblock_nrows, iblock, entry, H5AC_WRITE)))
                HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, FAIL, "unable to protect fractal heap indirect block")

            /* Release the child indirect block */
            if(H5AC_unprotect(hdr->f, dxpl_id, H5AC_FHEAP_IBLOCK, child_addr, child_iblock, H5AC__NO_FLAGS_SET) < 0)
                HDONE_ERROR(H5E_HEAP, H5E_CANTUNPROTECT, FAIL, "unable to release fractal heap indirect block")
        } /* end if */
        else {
HDfprintf(stderr, "%s: Creating indirect block from opaque section not supported\n", FUNC);
HGOTO_ERROR(H5E_HEAP, H5E_UNSUPPORTED, FAIL, "Creating indirect block from opaque section not supported yet")
        } /* end else */
    } /* end else */

    /* Drop reference count on indirect block that free section is in */
    if(H5HF_iblock_decr(iblock) < 0)
        HGOTO_ERROR(H5E_HEAP, H5E_CANTDEC, FAIL, "can't decrement reference count on shared indirect block")

    /* Free section structure */
    H5FL_FREE(H5HF_free_section_t, old_sec_node);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_alloc_opaque() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_create
 *
 * Purpose:	Allocate & initialize a managed indirect block
 *
 * Return:	SUCCEED/FAIL
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Mar  6 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HF_man_iblock_create(H5HF_hdr_t *hdr, hid_t dxpl_id,
    hsize_t block_off, unsigned nrows, unsigned max_rows, haddr_t *addr_p)
{
    H5HF_indirect_t *iblock = NULL;     /* Pointer to indirect block */
    size_t curr_row;                    /* Current row within indirect block */
    size_t u, v;                        /* Local index variable */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_create)

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(nrows > 0);
    HDassert(addr_p);

    /*
     * Allocate file and memory data structures.
     */
    if(NULL == (iblock = H5FL_MALLOC(H5HF_indirect_t)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for fractal heap indirect block")

    /* Reset the metadata cache info for the heap header */
    HDmemset(&iblock->cache_info, 0, sizeof(H5AC_info_t));

    /* Share common heap information */
    iblock->hdr = hdr;
    if(H5HF_hdr_incr(hdr) < 0)
	HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, FAIL, "can't increment reference count on shared heap header")

#ifdef QAK
HDfprintf(stderr, "%s: nrows = %u, max_nrows = %u\n", FUNC, nrows, max_nrows);
#endif /* QAK */
    /* Set info for direct block */
    iblock->rc = 0;
    iblock->parent = NULL;              /* Temporary, except for root indirect block */
    iblock->par_entry = 0;
    iblock->block_off = block_off;
    iblock->nrows = nrows;
    iblock->max_rows = max_rows;
    iblock->dirty = TRUE;
    iblock->fl_gen = hdr->fl_gen;       /* New blocks have their free list generation set up correctly */

    /* Compute size of buffer needed for indirect block */
    iblock->size = H5HF_MAN_INDIRECT_SIZE(hdr, iblock);

    /* Allocate indirect block entry tables */
    if(NULL == (iblock->ents = H5FL_SEQ_MALLOC(H5HF_indirect_ent_t, (iblock->nrows * hdr->man_dtable.cparam.width))))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for block entries")

    /* Initialize indirect block entry tables */
    curr_row = 0;
    iblock->child_free_space = 0;
    for(u = 0; u < (iblock->nrows * hdr->man_dtable.cparam.width); /* u advanced in inner loop */) {
        for(v = 0; v < hdr->man_dtable.cparam.width; v++, u++) {
            iblock->ents[u].addr = HADDR_UNDEF;
            iblock->ents[u].free_space = hdr->man_dtable.row_dblock_free[curr_row];
            iblock->child_free_space += iblock->ents[u].free_space;
        } /* end for */
        curr_row++;
    } /* end for */

    /* Allocate space for the indirect block on disk */
    if(HADDR_UNDEF == (*addr_p = H5MF_alloc(hdr->f, H5FD_MEM_FHEAP_IBLOCK, dxpl_id, (hsize_t)iblock->size)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "file allocation failed for fractal heap indirect block")
    iblock->addr = *addr_p;

/* XXX: Update indirect statistics when they are added */

    /* Cache the new fractal heap header */
    if(H5AC_set(hdr->f, dxpl_id, H5AC_FHEAP_IBLOCK, *addr_p, iblock, H5AC__NO_FLAGS_SET) < 0)
	HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add fractal heap indirect block to cache")

done:
    if(ret_value < 0)
        if(iblock)
            (void)H5HF_cache_iblock_dest(hdr->f, iblock);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_create() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_build_sections
 *
 * Purpose:	Build free space sections for child blocks of an indirect block
 *
 * Return:	SUCCEED/FAIL
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Apr 25 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5HF_man_iblock_build_sections(H5HF_indirect_t *iblock)
{
    H5HF_free_section_t *sec_node;      /* Pointer to free list section for block */
    H5HF_hdr_t *hdr;                    /* Heap header info */
    haddr_t curr_off;                   /* Offset of child block in heap */
    unsigned row, col;                  /* Current row & column being operated on */
    unsigned entry;                     /* Currenty entry being worked on */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_build_sections)

    /*
     * Check arguments.
     */
    HDassert(iblock);

    /* Get the heap header pointer (for convenience) */
    hdr = iblock->hdr;

    /* Set starting offset in heap */
    curr_off = iblock->block_off;

    /* Create a free space section for each child block of indirect block */
    entry = 0;
#ifdef QAK
HDfprintf(stderr, "%s: hdr->man_alloc_size = %Hu\n", FUNC, hdr->man_alloc_size);
#endif /* QAK */
    for(row = 0; row < iblock->nrows; row++) {
        for(col = 0; col < hdr->man_dtable.cparam.width; col++) {
#ifdef QAK
HDfprintf(stderr, "%s: curr_off = %a\n", FUNC, curr_off);
#endif /* QAK */
            /* Only create free space sections for blocks within the allocated size of the heap */
            if(curr_off >= hdr->man_alloc_size)
                break;

            /* Allocate section node */
            if(NULL == (sec_node = H5FL_MALLOC(H5HF_free_section_t)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for direct block free list section")

            /* Set section's information */
            sec_node->sect_addr = curr_off;
            sec_node->sect_size = iblock->ents[entry].free_space;
            sec_node->type = H5HF_SECT_OPAQUE;
            sec_node->u.opaque.iblock = iblock;
            sec_node->u.opaque.entry = entry;

            /* Increment reference count on indirect block */
            if(H5HF_iblock_incr(iblock) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTINC, FAIL, "can't increment reference count on shared indirect block")

            /* Add section to free list */
            if(H5HF_flist_add(hdr->flist, sec_node, &sec_node->sect_size, &sec_node->sect_addr) < 0)
                HGOTO_ERROR(H5E_HEAP, H5E_CANTINIT, FAIL, "can't add free space section to global list")

            /* Advance state */
            curr_off += hdr->man_dtable.row_block_size[row];
            entry++;
        } /* end for */
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_build_sections() */


/*-------------------------------------------------------------------------
 * Function:	H5HF_man_iblock_protect
 *
 * Purpose:	Convenience wrapper around H5AC_protect on a indirect block
 *              (Use H5AC_unprotect to unprotect it for now)
 *
 * Return:	Pointer to indirect block on success, NULL on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@ncsa.uiuc.edu
 *		Apr 17 2006
 *
 *-------------------------------------------------------------------------
 */
H5HF_indirect_t *
H5HF_man_iblock_protect(H5HF_hdr_t *hdr, hid_t dxpl_id, haddr_t iblock_addr,
    unsigned iblock_nrows, H5HF_indirect_t *par_iblock, unsigned par_entry,
    H5AC_protect_t rw)
{
    H5HF_parent_t par_info;             /* Parent info for loading block */
    H5HF_indirect_t *iblock;            /* Indirect block from cache */
    H5HF_indirect_t *ret_value;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5HF_man_iblock_protect)
#ifdef QAK
HDfprintf(stderr, "%s: iblock_addr = %a, iblock_nrows = %u\n", FUNC, iblock_addr, iblock_nrows);
#endif /* QAK */

    /*
     * Check arguments.
     */
    HDassert(hdr);
    HDassert(H5F_addr_defined(iblock_addr));
    HDassert(iblock_nrows > 0);

    /* Set up parent info */
    par_info.hdr = hdr;
    par_info.iblock = par_iblock;
    par_info.entry = par_entry;

    /* Protect the indirect block */
    if(NULL == (iblock = H5AC_protect(hdr->f, dxpl_id, H5AC_FHEAP_IBLOCK, iblock_addr, &iblock_nrows, &par_info, rw)))
        HGOTO_ERROR(H5E_HEAP, H5E_CANTPROTECT, NULL, "unable to protect fractal heap indirect block")

    /* Regenerate the free list information for this block, if necessary */
    /* (Only create free list information if write access is requested) */
    if(rw == H5AC_WRITE && hdr->fl_gen != iblock->fl_gen) {
        /* Build the free list sections for the block */
        if(H5HF_man_iblock_build_sections(iblock) < 0)
            HGOTO_ERROR(H5E_HEAP, H5E_CANTDECODE, NULL, "can't build free space sections for block")

        /* Mark the block's free list generation as up to date now */
        iblock->fl_gen = hdr->fl_gen;
    } /* end if */

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

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5HF_man_iblock_protect() */