summaryrefslogtreecommitdiffstats
path: root/src/H5Distore.c
blob: b2a7097413dcb37986a645aeb64d7696532a01ad (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
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/* Programmer: 	Robb Matzke <matzke@llnl.gov>
 *	       	Wednesday, October  8, 1997
 *
 * Purpose:	Indexed (chunked) I/O functions.  The logical
 *		multi-dimensional data space is regularly partitioned into
 *		same-sized "chunks", the first of which is aligned with the
 *		logical origin.  The chunks are given a multi-dimensional
 *		index which is used as a lookup key in a B-tree that maps
 *		chunk index to disk address.  Each chunk can be compressed
 *		independently and the chunks may move around in the file as
 *		their storage requirements change.
 *
 * Cache:	Disk I/O is performed in units of chunks and H5MF_alloc()
 *		contains code to optionally align chunks on disk block
 *		boundaries for performance.
 *
 *		The chunk cache is an extendible hash indexed by a function
 *		of storage B-tree address and chunk N-dimensional offset
 *		within the dataset.  Collisions are not resolved -- one of
 *		the two chunks competing for the hash slot must be preempted
 *		from the cache.  All entries in the hash also participate in
 *		a doubly-linked list and entries are penalized by moving them
 *		toward the front of the list.  When a new chunk is about to
 *		be added to the cache the heap is pruned by preempting
 *		entries near the front of the list to make room for the new
 *		entry which is added to the end of the list.
 */

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

#define H5B_PACKAGE		/*suppress error about including H5Bpkg	  */
#define H5D_PACKAGE		/*suppress error about including H5Dpkg	  */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Bpkg.h"		/* B-link trees				*/
#include "H5Dpkg.h"		/* Datasets				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fprivate.h"		/* Files				*/
#include "H5FDprivate.h"	/* File drivers				*/
#include "H5FLprivate.h"	/* Free Lists                           */
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5MFprivate.h"	/* File space management		*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Oprivate.h"		/* Object headers		  	*/
#include "H5Pprivate.h"         /* Property lists                       */
#include "H5Sprivate.h"         /* Dataspaces                           */
#include "H5Vprivate.h"		/* Vector and array functions		*/

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

/*
 * Feature: If this constant is defined then every cache preemption and load
 *	    causes a character to be printed on the standard error stream:
 *
 *     `.': Entry was preempted because it has been completely read or
 *	    completely written but not partially read and not partially
 *	    written. This is often a good reason for preemption because such
 *	    a chunk will be unlikely to be referenced in the near future.
 *
 *     `:': Entry was preempted because it hasn't been used recently.
 *
 *     `#': Entry was preempted because another chunk collided with it. This
 *	    is usually a relatively bad thing.  If there are too many of
 *	    these then the number of entries in the cache can be increased.
 *
 *       c: Entry was preempted because the file is closing.
 *
 *	 w: A chunk read operation was eliminated because the library is
 *	    about to write new values to the entire chunk.  This is a good
 *	    thing, especially on files where the chunk size is the same as
 *	    the disk block size, chunks are aligned on disk block boundaries,
 *	    and the operating system can also eliminate a read operation.
 */

/*#define H5D_ISTORE_DEBUG */

/*
 * Given a B-tree node return the dimensionality of the chunks pointed to by
 * that node.
 */
#define H5D_ISTORE_NDIMS(X)	(((X)->sizeof_rkey-8)/8)

#define H5D_HASH(D,ADDR) H5F_addr_hash(ADDR,(D)->cache.chunk.nslots)

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

/* Raw data chunks are cached.  Each entry in the cache is: */
typedef struct H5D_rdcc_ent_t {
    hbool_t	locked;		/*entry is locked in cache		*/
    hbool_t	dirty;		/*needs to be written to disk?		*/
    hsize_t	offset[H5O_LAYOUT_NDIMS]; /*chunk name			*/
    size_t	rd_count;	/*bytes remaining to be read		*/
    size_t	wr_count;	/*bytes remaining to be written		*/
    size_t	chunk_size;	/*size of a chunk			*/
    size_t	alloc_size;	/*amount allocated for the chunk	*/
    uint8_t	*chunk;		/*the unfiltered chunk data		*/
    unsigned	idx;		/*index in hash table			*/
    struct H5D_rdcc_ent_t *next;/*next item in doubly-linked list	*/
    struct H5D_rdcc_ent_t *prev;/*previous item in doubly-linked list	*/
} H5D_rdcc_ent_t;
typedef H5D_rdcc_ent_t *H5D_rdcc_ent_ptr_t; /* For free lists */

/*
 * B-tree key.	A key contains the minimum logical N-dimensional address and
 * the logical size of the chunk to which this key refers.  The
 * fastest-varying dimension is assumed to reference individual bytes of the
 * array, so a 100-element 1-d array of 4-byte integers would really be a 2-d
 * array with the slow varying dimension of size 100 and the fast varying
 * dimension of size 4 (the storage dimensionality has very little to do with
 * the real dimensionality).
 *
 * Only the first few values of the OFFSET and SIZE fields are actually
 * stored on disk, depending on the dimensionality.
 *
 * The chunk's file address is part of the B-tree and not part of the key.
 */
typedef struct H5D_istore_key_t {
    size_t	nbytes;				/*size of stored data	*/
    hsize_t	offset[H5O_LAYOUT_NDIMS];	/*logical offset to start*/
    unsigned	filter_mask;			/*excluded filters	*/
} H5D_istore_key_t;

/*
 * Common data exchange structure for indexed storage nodes.  This structure is
 * passed through the B-link tree layer to the methods for the objects
 * to which the B-link tree points.
 */
typedef struct H5D_istore_bt_ud_common_t {
    /* downward */
    H5D_istore_key_t	key;	                /*key values		*/
    const H5O_layout_t	*mesg;		        /*layout message	*/
} H5D_istore_bt_ud_common_t;

/*
 * Data exchange structure for indexed storage nodes.  This structure is
 * passed through the B-link tree layer to the methods for the objects
 * to which the B-link tree points for operations which require no
 * additional information.
 *
 * (Just an alias for the "common" info).
 */
typedef H5D_istore_bt_ud_common_t H5D_istore_ud0_t;

typedef struct H5D_istore_ud1_t {
    H5D_istore_bt_ud_common_t common;           /* Common info for B-tree user data (must be first) */
    haddr_t		addr;			/*file address of chunk */
} H5D_istore_ud1_t;

/* B-tree callback info for iteration to total allocated space */
typedef struct H5D_istore_it_ud1_t {
    H5D_istore_bt_ud_common_t common;           /* Common info for B-tree user data (must be first) */
    hsize_t		total_storage;	        /*output from iterator	*/
} H5D_istore_it_ud1_t;

/* B-tree callback info for iteration to dump node's info */
typedef struct H5D_istore_it_ud2_t {
    H5D_istore_bt_ud_common_t common;           /* Common info for B-tree user data (must be first) */
    FILE		*stream;		/*debug output stream	*/
    hbool_t             header_displayed;       /* Node's header is displayed? */
} H5D_istore_it_ud2_t;

/* B-tree callback info for iteration to prune chunks */
typedef struct H5D_istore_it_ud3_t {
    H5D_istore_bt_ud_common_t common;           /* Common info for B-tree user data (must be first) */
    hsize_t		*dims;		        /*dataset dimensions	*/
} H5D_istore_it_ud3_t;

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

static void *H5D_istore_chunk_alloc(size_t size, const H5O_pline_t *pline);
static void *H5D_istore_chunk_xfree(void *chk, const H5O_pline_t *pline);
static herr_t H5D_istore_shared_create (const H5F_t *f, H5O_layout_t *layout);
static herr_t H5D_istore_shared_free (void *page);

/* B-tree iterator callbacks */
static int H5D_istore_iter_allocated(H5F_t *f, hid_t dxpl_id, const void *left_key, haddr_t addr,
				 const void *right_key, void *_udata);
static int H5D_istore_iter_dump(H5F_t *f, hid_t dxpl_id, const void *left_key, haddr_t addr,
				 const void *right_key, void *_udata);
static int H5D_istore_prune_extent(H5F_t *f, hid_t dxpl_id, const void *_lt_key, haddr_t addr,
        const void *_rt_key, void *_udata);

/* B-tree callbacks */
static H5RC_t *H5D_istore_get_shared(const H5F_t *f, const void *_udata);
static herr_t H5D_istore_new_node(H5F_t *f, hid_t dxpl_id, H5B_ins_t, void *_lt_key,
				  void *_udata, void *_rt_key,
				  haddr_t *addr_p /*out*/);
static int H5D_istore_cmp2(H5F_t *f, hid_t dxpl_id, void *_lt_key, void *_udata,
			    void *_rt_key);
static int H5D_istore_cmp3(H5F_t *f, hid_t dxpl_id, void *_lt_key, void *_udata,
			    void *_rt_key);
static herr_t H5D_istore_found(H5F_t *f, hid_t dxpl_id, haddr_t addr, const void *_lt_key,
			       void *_udata);
static H5B_ins_t H5D_istore_insert(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *_lt_key,
				   hbool_t *lt_key_changed, void *_md_key,
				   void *_udata, void *_rt_key,
				   hbool_t *rt_key_changed,
				   haddr_t *new_node/*out*/);
static H5B_ins_t H5D_istore_remove( H5F_t *f, hid_t dxpl_id, haddr_t addr, void *_lt_key,
                  hbool_t *lt_key_changed, void *_udata, void *_rt_key,
                  hbool_t *rt_key_changed);
static herr_t H5D_istore_decode_key(const H5F_t *f, const H5B_t *bt, const uint8_t *raw,
				    void *_key);
static herr_t H5D_istore_encode_key(const H5F_t *f, const H5B_t *bt, uint8_t *raw,
				    void *_key);
static herr_t H5D_istore_debug_key(FILE *stream, H5F_t *f, hid_t dxpl_id,
                                int indent, int fwidth, const void *key,
                                    const void *udata);

/* inherits B-tree like properties from H5B */
H5B_class_t H5B_ISTORE[1] = {{
    H5B_ISTORE_ID,		/*id			*/
    sizeof(H5D_istore_key_t),	/*sizeof_nkey		*/
    H5D_istore_get_shared,	/*get_shared		*/
    H5D_istore_new_node,	/*new			*/
    H5D_istore_cmp2,		/*cmp2			*/
    H5D_istore_cmp3,		/*cmp3			*/
    H5D_istore_found,		/*found			*/
    H5D_istore_insert,		/*insert		*/
    FALSE,			/*follow min branch?	*/
    FALSE,			/*follow max branch?	*/
    H5D_istore_remove,          /*remove		*/
    H5D_istore_decode_key,	/*decode		*/
    H5D_istore_encode_key,	/*encode		*/
    H5D_istore_debug_key,	/*debug			*/
}};

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

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

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

/* Declare a free list to manage H5F_rdcc_ent_t objects */
H5FL_DEFINE_STATIC(H5D_rdcc_ent_t);

/* Declare a free list to manage the H5F_rdcc_ent_ptr_t sequence information */
H5FL_SEQ_DEFINE_STATIC(H5D_rdcc_ent_ptr_t);

/* Declare a free list to manage the chunk sequence information */
H5FL_BLK_DEFINE_STATIC(chunk);

/* Declare a free list to manage the native key offset sequence information */
H5FL_SEQ_DEFINE_STATIC(size_t);

/* Declare a free list to manage the raw page information */
H5FL_BLK_DEFINE_STATIC(chunk_page);

/* Declare a free list to manage blocks of type conversion data */
H5FL_BLK_EXTERN(type_conv);


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_get_shared
 *
 * Purpose:	Returns the shared B-tree info for the specified UDATA.
 *
 * Return:	Success:	Pointer to the raw B-tree page for this dataset
 *
 *		Failure:	Can't fail
 *
 * Programmer:	Quincey Koziol
 *		Monday, July  5, 2004
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static H5RC_t *
H5D_istore_get_shared(const H5F_t UNUSED *f, const void *_udata)
{
    const H5D_istore_ud0_t *udata = (const H5D_istore_ud0_t *) _udata;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_get_shared)

    HDassert(udata);
    HDassert(udata->mesg);
    HDassert(udata->mesg->u.chunk.btree_shared);

    /* Increment reference count on B-tree info */
    H5RC_INC(udata->mesg->u.chunk.btree_shared);

    /* Return the pointer to the ref-count object */
    FUNC_LEAVE_NOAPI(udata->mesg->u.chunk.btree_shared)
} /* end H5D_istore_get_shared() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_decode_key
 *
 * Purpose:	Decodes a raw key into a native key for the B-tree
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Friday, October 10, 1997
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_decode_key(const H5F_t UNUSED *f, const H5B_t *bt, const uint8_t *raw, void *_key)
{
    H5D_istore_key_t	*key = (H5D_istore_key_t *) _key;
    H5B_shared_t        *shared;        /* Pointer to shared B-tree info */
    size_t		ndims;
    unsigned		u;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_decode_key)

    /* check args */
    assert(f);
    assert(bt);
    shared=H5RC_GET_OBJ(bt->rc_shared);
    HDassert(shared);
    assert(raw);
    assert(key);
    ndims = H5D_ISTORE_NDIMS(shared);
    assert(ndims<=H5O_LAYOUT_NDIMS);

    /* decode */
    UINT32DECODE(raw, key->nbytes);
    UINT32DECODE(raw, key->filter_mask);
    for (u=0; u<ndims; u++)
	UINT64DECODE(raw, key->offset[u]);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5D_istore_decode_key() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_encode_key
 *
 * Purpose:	Encode a key from native format to raw format.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Friday, October 10, 1997
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_encode_key(const H5F_t UNUSED *f, const H5B_t *bt, uint8_t *raw, void *_key)
{
    H5D_istore_key_t	*key = (H5D_istore_key_t *) _key;
    H5B_shared_t        *shared;        /* Pointer to shared B-tree info */
    size_t		ndims;
    unsigned		u;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_encode_key)

    /* check args */
    assert(f);
    assert(bt);
    shared=H5RC_GET_OBJ(bt->rc_shared);
    HDassert(shared);
    assert(raw);
    assert(key);
    ndims = H5D_ISTORE_NDIMS(shared);
    assert(ndims<=H5O_LAYOUT_NDIMS);

    /* encode */
    UINT32ENCODE(raw, key->nbytes);
    UINT32ENCODE(raw, key->filter_mask);
    for (u=0; u<ndims; u++)
	UINT64ENCODE(raw, key->offset[u]);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5D_istore_encode_key() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_debug_key
 *
 * Purpose:	Prints a key.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, April 16, 1998
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5D_istore_debug_key(FILE *stream, H5F_t UNUSED *f, hid_t UNUSED dxpl_id, int indent, int fwidth,
		      const void *_key, const void *_udata)
{
    const H5D_istore_key_t	*key = (const H5D_istore_key_t *)_key;
    const H5D_istore_ud0_t	*udata = (const H5D_istore_ud0_t *)_udata;
    unsigned		u;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_debug_key)

    HDassert(key);

    HDfprintf(stream, "%*s%-*s %Zd bytes\n", indent, "", fwidth, "Chunk size:", key->nbytes);
    HDfprintf(stream, "%*s%-*s 0x%08x\n", indent, "", fwidth, "Filter mask:", key->filter_mask);
    HDfprintf(stream, "%*s%-*s {", indent, "", fwidth, "Logical offset:");
    for(u = 0; u < udata->mesg->u.chunk.ndims; u++)
        HDfprintf(stream, "%s%Hd", u?", ":"", key->offset[u]);
    HDfputs("}\n", stream);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5D_istore_debug_key() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_cmp2
 *
 * Purpose:	Compares two keys sort of like strcmp().  The UDATA pointer
 *		is only to supply extra information not carried in the keys
 *		(in this case, the dimensionality) and is not compared
 *		against the keys.
 *
 * Return:	Success:	-1 if LT_KEY is less than RT_KEY;
 *				1 if LT_KEY is greater than RT_KEY;
 *				0 if LT_KEY and RT_KEY are equal.
 *
 *		Failure:	FAIL (same as LT_KEY<RT_KEY)
 *
 * Programmer:	Robb Matzke
 *		Thursday, November  6, 1997
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static int
H5D_istore_cmp2(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, void *_lt_key, void *_udata,
		void *_rt_key)
{
    H5D_istore_key_t	*lt_key = (H5D_istore_key_t *) _lt_key;
    H5D_istore_key_t	*rt_key = (H5D_istore_key_t *) _rt_key;
    H5D_istore_ud0_t	*udata = (H5D_istore_ud0_t *) _udata;
    int		ret_value;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_cmp2)

    HDassert(lt_key);
    HDassert(rt_key);
    HDassert(udata);
    HDassert(udata->mesg->u.chunk.ndims > 0 && udata->mesg->u.chunk.ndims <= H5O_LAYOUT_NDIMS);

    /* Compare the offsets but ignore the other fields */
    ret_value = H5V_vector_cmp_u(udata->mesg->u.chunk.ndims, lt_key->offset, rt_key->offset);

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_cmp2() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_cmp3
 *
 * Purpose:	Compare the requested datum UDATA with the left and right
 *		keys of the B-tree.
 *
 * Return:	Success:	negative if the min_corner of UDATA is less
 *				than the min_corner of LT_KEY.
 *
 *				positive if the min_corner of UDATA is
 *				greater than or equal the min_corner of
 *				RT_KEY.
 *
 *				zero otherwise.	 The min_corner of UDATA is
 *				not necessarily contained within the address
 *				space represented by LT_KEY, but a key that
 *				would describe the UDATA min_corner address
 *				would fall lexicographically between LT_KEY
 *				and RT_KEY.
 *
 *		Failure:	FAIL (same as UDATA < LT_KEY)
 *
 * Programmer:	Robb Matzke
 *		Wednesday, October  8, 1997
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static int
H5D_istore_cmp3(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, void *_lt_key, void *_udata,
		void *_rt_key)
{
    H5D_istore_key_t	*lt_key = (H5D_istore_key_t *) _lt_key;
    H5D_istore_key_t	*rt_key = (H5D_istore_key_t *) _rt_key;
    H5D_istore_ud0_t	*udata = (H5D_istore_ud0_t *) _udata;
    int		ret_value = 0;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_cmp3)

    HDassert(lt_key);
    HDassert(rt_key);
    HDassert(udata);
    HDassert(udata->mesg->u.chunk.ndims > 0 && udata->mesg->u.chunk.ndims <= H5O_LAYOUT_NDIMS);

    /* Special case for faster checks on 1-D chunks */
    /* (Checking for ndims==2 because last dimension is the datatype size) */
    /* The additional checking for the right key is necessary due to the */
    /* slightly odd way the library initializes the right-most node in the */
    /* indexed storage B-tree... */
    /* (Dump the B-tree with h5debug to look at it) -QAK */
    if(udata->mesg->u.chunk.ndims==2) {
        if(udata->key.offset[0]>rt_key->offset[0])
            ret_value=1;
        else if(udata->key.offset[0]==rt_key->offset[0] &&
                udata->key.offset[1]>=rt_key->offset[1])
            ret_value=1;
        else if(udata->key.offset[0]<lt_key->offset[0])
            ret_value=(-1);
    } /* end if */
    else {
        if (H5V_vector_ge_u(udata->mesg->u.chunk.ndims, udata->key.offset,
                                 rt_key->offset))
            ret_value = 1;
        else if (H5V_vector_lt_u(udata->mesg->u.chunk.ndims, udata->key.offset,
                            lt_key->offset))
            ret_value = -1;
    } /* end else */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_cmp3() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_new_node
 *
 * Purpose:	Adds a new entry to an i-storage B-tree.  We can assume that
 *		the domain represented by UDATA doesn't intersect the domain
 *		already represented by the B-tree.
 *
 * Return:	Success:	Non-negative. The address of leaf is returned
 *				through the ADDR argument.  It is also added
 *				to the UDATA.
 *
 * 		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *		Tuesday, October 14, 1997
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_new_node(H5F_t *f, hid_t dxpl_id, H5B_ins_t op,
		    void *_lt_key, void *_udata, void *_rt_key,
		    haddr_t *addr_p/*out*/)
{
    H5D_istore_key_t	*lt_key = (H5D_istore_key_t *) _lt_key;
    H5D_istore_key_t	*rt_key = (H5D_istore_key_t *) _rt_key;
    H5D_istore_ud1_t	*udata = (H5D_istore_ud1_t *) _udata;
    unsigned		u;
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_new_node)

    /* check args */
    HDassert(f);
    HDassert(lt_key);
    HDassert(rt_key);
    HDassert(udata);
    HDassert(udata->common.mesg->u.chunk.ndims > 0 && udata->common.mesg->u.chunk.ndims < H5O_LAYOUT_NDIMS);
    HDassert(addr_p);

    /* Allocate new storage */
    HDassert(udata->common.key.nbytes > 0);
    H5_CHECK_OVERFLOW(udata->common.key.nbytes ,size_t, hsize_t);
    if(HADDR_UNDEF == (*addr_p = H5MF_alloc(f, H5FD_MEM_DRAW, dxpl_id, (hsize_t)udata->common.key.nbytes)))
        HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "couldn't allocate new file storage")
    udata->addr = *addr_p;

    /*
     * The left key describes the storage of the UDATA chunk being
     * inserted into the tree.
     */
    lt_key->nbytes = udata->common.key.nbytes;
    lt_key->filter_mask = udata->common.key.filter_mask;
    for (u=0; u<udata->common.mesg->u.chunk.ndims; u++)
        lt_key->offset[u] = udata->common.key.offset[u];

    /*
     * The right key might already be present.  If not, then add a zero-width
     * chunk.
     */
    if (H5B_INS_LEFT != op) {
        rt_key->nbytes = 0;
        rt_key->filter_mask = 0;
        for (u=0; u<udata->common.mesg->u.chunk.ndims; u++) {
            HDassert(udata->common.key.offset[u]+udata->common.mesg->u.chunk.dim[u] >
                udata->common.key.offset[u]);
            rt_key->offset[u] = udata->common.key.offset[u] + udata->common.mesg->u.chunk.dim[u];
        }
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_new_node() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_found
 *
 * Purpose:	This function is called when the B-tree search engine has
 *		found the leaf entry that points to a chunk of storage that
 *		contains the beginning of the logical address space
 *		represented by UDATA.  The LT_KEY is the left key (the one
 *		that describes the chunk) and RT_KEY is the right key (the
 *		one that describes the next or last chunk).
 *
 * Note:	It's possible that the chunk isn't really found.  For
 *		instance, in a sparse dataset the requested chunk might fall
 *		between two stored chunks in which case this function is
 *		called with the maximum stored chunk indices less than the
 *		requested chunk indices.
 *
 * Return:	Non-negative on success with information about the chunk
 *		returned through the UDATA argument. Negative on failure.
 *
 * Programmer:	Robb Matzke
 *		Thursday, October  9, 1997
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5D_istore_found(H5F_t UNUSED *f, hid_t UNUSED dxpl_id, haddr_t addr, const void *_lt_key,
		 void *_udata)
{
    H5D_istore_ud1_t	   *udata = (H5D_istore_ud1_t *) _udata;
    const H5D_istore_key_t *lt_key = (const H5D_istore_key_t *) _lt_key;
    unsigned		u;
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_found)

    /* Check arguments */
    HDassert(f);
    HDassert(H5F_addr_defined(addr));
    HDassert(udata);
    HDassert(lt_key);

    /* Is this *really* the requested chunk? */
    for(u = 0; u < udata->common.mesg->u.chunk.ndims; u++)
        if(udata->common.key.offset[u] >= lt_key->offset[u] + udata->common.mesg->u.chunk.dim[u])
            HGOTO_DONE(FAIL)

    /* Initialize return values */
    udata->addr = addr;
    udata->common.key.nbytes = lt_key->nbytes;
    udata->common.key.filter_mask = lt_key->filter_mask;
    HDassert(lt_key->nbytes>0);
    for(u = 0; u < udata->common.mesg->u.chunk.ndims; u++)
        udata->common.key.offset[u] = lt_key->offset[u];

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_found() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_insert
 *
 * Purpose:	This function is called when the B-tree insert engine finds
 *		the node to use to insert new data.  The UDATA argument
 *		points to a struct that describes the logical addresses being
 *		added to the file.  This function allocates space for the
 *		data and returns information through UDATA describing a
 *		file chunk to receive (part of) the data.
 *
 *		The LT_KEY is always the key describing the chunk of file
 *		memory at address ADDR. On entry, UDATA describes the logical
 *		addresses for which storage is being requested (through the
 *		`offset' and `size' fields). On return, UDATA describes the
 *		logical addresses contained in a chunk on disk.
 *
 * Return:	Success:	An insertion command for the caller, one of
 *				the H5B_INS_* constants.  The address of the
 *				new chunk is returned through the NEW_NODE
 *				argument.
 *
 *		Failure:	H5B_INS_ERROR
 *
 * Programmer:	Robb Matzke
 *		Thursday, October  9, 1997
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static H5B_ins_t
H5D_istore_insert(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *_lt_key,
		  hbool_t *lt_key_changed,
		  void *_md_key, void *_udata, void *_rt_key,
		  hbool_t UNUSED *rt_key_changed,
		  haddr_t *new_node_p/*out*/)
{
    H5D_istore_key_t	*lt_key = (H5D_istore_key_t *) _lt_key;
    H5D_istore_key_t	*md_key = (H5D_istore_key_t *) _md_key;
    H5D_istore_key_t	*rt_key = (H5D_istore_key_t *) _rt_key;
    H5D_istore_ud1_t	*udata = (H5D_istore_ud1_t *) _udata;
    int		cmp;
    unsigned		u;
    H5B_ins_t		ret_value;

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_insert)

    /* check args */
    HDassert(f);
    HDassert(H5F_addr_defined(addr));
    HDassert(lt_key);
    HDassert(lt_key_changed);
    HDassert(md_key);
    HDassert(udata);
    HDassert(rt_key);
    HDassert(new_node_p);

    cmp = H5D_istore_cmp3(f, dxpl_id, lt_key, udata, rt_key);
    HDassert(cmp <= 0);

    if (cmp < 0) {
        /* Negative indices not supported yet */
        HGOTO_ERROR(H5E_STORAGE, H5E_UNSUPPORTED, H5B_INS_ERROR, "internal error")

    } else if (H5V_vector_eq_u (udata->common.mesg->u.chunk.ndims,
				udata->common.key.offset, lt_key->offset) &&
	       lt_key->nbytes>0) {
        /*
         * Already exists.  If the new size is not the same as the old size
         * then we should reallocate storage.
         */
        if (lt_key->nbytes != udata->common.key.nbytes) {
/* Currently, the old chunk 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 should keep the file smaller also, by freeing the space and then
 * allocating new space, instead of vice versa (in H5MF_realloc).
 *
 * QAK - 11/19/2002
 */
#ifdef OLD_WAY
            if(HADDR_UNDEF == (*new_node_p = H5MF_realloc(f, H5FD_MEM_DRAW, addr,
                      (hsize_t)lt_key->nbytes, (hsize_t)udata->common.key.nbytes)))
                HGOTO_ERROR(H5E_STORAGE, H5E_NOSPACE, H5B_INS_ERROR, "unable to reallocate chunk storage")
#else /* OLD_WAY */
            H5_CHECK_OVERFLOW( lt_key->nbytes ,size_t, hsize_t);
            if(H5MF_xfree(f, H5FD_MEM_DRAW, dxpl_id, addr, (hsize_t)lt_key->nbytes)<0)
                HGOTO_ERROR(H5E_STORAGE, H5E_CANTFREE, H5B_INS_ERROR, "unable to free chunk")
            H5_CHECK_OVERFLOW(udata->common.key.nbytes ,size_t, hsize_t);
            if(HADDR_UNDEF == (*new_node_p = H5MF_alloc(f, H5FD_MEM_DRAW, dxpl_id, (hsize_t)udata->common.key.nbytes)))
                HGOTO_ERROR(H5E_STORAGE, H5E_NOSPACE, H5B_INS_ERROR, "unable to reallocate chunk")
#endif /* OLD_WAY */
            lt_key->nbytes = udata->common.key.nbytes;
            lt_key->filter_mask = udata->common.key.filter_mask;
            *lt_key_changed = TRUE;
            udata->addr = *new_node_p;
            ret_value = H5B_INS_CHANGE;
        } else {
            udata->addr = addr;
            ret_value = H5B_INS_NOOP;
        }

    } else if (H5V_hyper_disjointp(udata->common.mesg->u.chunk.ndims,
				   lt_key->offset, udata->common.mesg->u.chunk.dim,
				   udata->common.key.offset, udata->common.mesg->u.chunk.dim)) {
        HDassert(H5V_hyper_disjointp(udata->common.mesg->u.chunk.ndims,
				   rt_key->offset, udata->common.mesg->u.chunk.dim,
				   udata->common.key.offset, udata->common.mesg->u.chunk.dim));
        /*
         * Split this node, inserting the new new node to the right of the
         * current node.  The MD_KEY is where the split occurs.
         */
        md_key->nbytes = udata->common.key.nbytes;
        md_key->filter_mask = udata->common.key.filter_mask;
        for(u = 0; u < udata->common.mesg->u.chunk.ndims; u++) {
            HDassert(0 == udata->common.key.offset[u] % udata->common.mesg->u.chunk.dim[u]);
            md_key->offset[u] = udata->common.key.offset[u];
        }

        /*
         * Allocate storage for the new chunk
         */
        H5_CHECK_OVERFLOW(udata->common.key.nbytes ,size_t, hsize_t);
        if(HADDR_UNDEF == (*new_node_p = H5MF_alloc(f, H5FD_MEM_DRAW, dxpl_id, (hsize_t)udata->common.key.nbytes)))
            HGOTO_ERROR(H5E_STORAGE, H5E_NOSPACE, H5B_INS_ERROR, "file allocation failed")
        udata->addr = *new_node_p;
        ret_value = H5B_INS_RIGHT;

    } else {
        HGOTO_ERROR(H5E_IO, H5E_UNSUPPORTED, H5B_INS_ERROR, "internal error")
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_insert() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_iter_allocated
 *
 * Purpose:	Simply counts the number of chunks for a dataset.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 21, 1999
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static int
H5D_istore_iter_allocated (H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const void *_lt_key, haddr_t UNUSED addr,
		    const void UNUSED *_rt_key, void *_udata)
{
    H5D_istore_it_ud1_t	*udata = (H5D_istore_it_ud1_t *)_udata;
    const H5D_istore_key_t	*lt_key = (const H5D_istore_key_t *)_lt_key;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_iter_allocated)

    udata->total_storage += lt_key->nbytes;

    FUNC_LEAVE_NOAPI(H5B_ITER_CONT)
} /* H5D_istore_iter_allocated() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_iter_dump
 *
 * Purpose:	If the UDATA.STREAM member is non-null then debugging
 *              information is written to that stream.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 21, 1999
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static int
H5D_istore_iter_dump (H5F_t UNUSED *f, hid_t UNUSED dxpl_id, const void *_lt_key, haddr_t UNUSED addr,
		    const void UNUSED *_rt_key, void *_udata)
{
    H5D_istore_it_ud2_t	*udata = (H5D_istore_it_ud2_t *)_udata;
    const H5D_istore_key_t	*lt_key = (const H5D_istore_key_t *)_lt_key;
    unsigned		u;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_iter_dump)

    if(udata->stream) {
        if(!udata->header_displayed) {
            HDfprintf(udata->stream, "           Flags    Bytes     Address          Logical Offset\n");
            HDfprintf(udata->stream, "        ========== ======== ========== ==============================\n");

            /* Set flag that the headers has been printed */
            udata->header_displayed = TRUE;
        } /* end if */
        HDfprintf(udata->stream,     "        0x%08x %8Zu %10a [", lt_key->filter_mask, lt_key->nbytes, addr);
        for(u = 0; u < udata->common.mesg->u.chunk.ndims; u++)
            HDfprintf(udata->stream, "%s%Hd", (u ? ", " : ""), lt_key->offset[u]);
        HDfputs("]\n", udata->stream);
    } /* end if */

    FUNC_LEAVE_NOAPI(H5B_ITER_CONT)
} /* H5D_istore_iter_dump() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_init
 *
 * Purpose:	Initialize the raw data chunk cache for a dataset.  This is
 *		called when the dataset is initialized.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Monday, May 18, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_init (const H5F_t *f, const H5D_t *dset)
{
    H5D_rdcc_t	*rdcc = &(dset->shared->cache.chunk);
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_init, FAIL)

    if (H5F_RDCC_NBYTES(f)>0 && H5F_RDCC_NELMTS(f)>0) {
        rdcc->nbytes_max = H5F_RDCC_NBYTES(f);
	rdcc->nslots = H5F_RDCC_NELMTS(f);
	rdcc->slot = H5FL_SEQ_CALLOC (H5D_rdcc_ent_ptr_t,rdcc->nslots);
	if (NULL==rdcc->slot)
	    HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
    } /* end if */

    /* Allocate the shared structure */
    if(H5D_istore_shared_create(f, &dset->shared->layout)<0)
	HGOTO_ERROR (H5E_RESOURCE, H5E_CANTINIT, FAIL, "can't create wrapper for shared B-tree info")
done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_init() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_flush_entry
 *
 * Purpose:	Writes a chunk to disk.  If RESET is non-zero then the
 *		entry is cleared -- it's slightly faster to flush a chunk if
 *		the RESET flag is turned on because it results in one fewer
 *		memory copy.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_flush_entry(const H5D_io_info_t *io_info, H5D_rdcc_ent_t *ent, hbool_t reset)
{
    herr_t		ret_value=SUCCEED;	/*return value			*/
    unsigned		u;		/*counters			*/
    void		*buf=NULL;	/*temporary buffer		*/
    size_t		alloc;		/*bytes allocated for BUF	*/
    hbool_t		point_of_no_return = FALSE;

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_flush_entry)

    assert(io_info);
    assert(io_info->dset);
    assert(ent);
    assert(!ent->locked);

    buf = ent->chunk;
    if (ent->dirty) {
        H5D_istore_ud1_t 	udata;		/*pass through B-tree		*/

        udata.common.mesg = &io_info->dset->shared->layout;
        udata.common.key.filter_mask = 0;
        udata.addr = HADDR_UNDEF;
        udata.common.key.nbytes = ent->chunk_size;
        for (u=0; u<io_info->dset->shared->layout.u.chunk.ndims; u++)
            udata.common.key.offset[u] = ent->offset[u];
        alloc = ent->alloc_size;

        /* Should the chunk be filtered before writing it to disk? */
        if (io_info->dset->shared->dcpl_cache.pline.nused) {
            if (!reset) {
                /*
                 * Copy the chunk to a new buffer before running it through
                 * the pipeline because we'll want to save the original buffer
                 * for later.
                 */
                alloc = ent->chunk_size;
                if (NULL==(buf = H5MM_malloc(alloc)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for pipeline")
                HDmemcpy(buf, ent->chunk, ent->chunk_size);
            } else {
                /*
                 * If we are reseting and something goes wrong after this
                 * point then it's too late to recover because we may have
                 * destroyed the original data by calling H5Z_pipeline().
                 * The only safe option is to continue with the reset
                 * even if we can't write the data to disk.
                 */
                point_of_no_return = TRUE;
                ent->chunk = NULL;
            }
            if (H5Z_pipeline(&(io_info->dset->shared->dcpl_cache.pline), 0, &(udata.common.key.filter_mask), io_info->dxpl_cache->err_detect,
                     io_info->dxpl_cache->filter_cb, &(udata.common.key.nbytes), &alloc, &buf)<0)
                HGOTO_ERROR(H5E_PLINE, H5E_WRITEERROR, FAIL, "output pipeline failed")
        }

        /*
         * Create the chunk it if it doesn't exist, or reallocate the chunk if
         * its size changed.  Then write the data into the file.
         */
        if (H5B_insert(io_info->dset->ent.file, io_info->dxpl_id, H5B_ISTORE, io_info->dset->shared->layout.u.chunk.addr, &udata)<0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to allocate chunk")
        if (H5F_block_write(io_info->dset->ent.file, H5FD_MEM_DRAW, udata.addr, udata.common.key.nbytes, io_info->dxpl_id, buf)<0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write raw data to file")

        /* Mark cache entry as clean */
        ent->dirty = FALSE;
#ifdef H5D_ISTORE_DEBUG
        io_info->dset->shared->cache.chunk.nflushes++;
#endif /* H5D_ISTORE_DEBUG */
    } /* end if */

    /* Reset, but do not free or removed from list */
    if (reset) {
        point_of_no_return = FALSE;
        if(buf==ent->chunk)
            buf = NULL;
        if(ent->chunk!=NULL)
            ent->chunk = H5D_istore_chunk_xfree(ent->chunk,&(io_info->dset->shared->dcpl_cache.pline));
    } /* end if */

done:
    /* Free the temp buffer only if it's different than the entry chunk */
    if (buf!=ent->chunk)
        H5MM_xfree(buf);

    /*
     * If we reached the point of no return then we have no choice but to
     * reset the entry.  This can only happen if RESET is true but the
     * output pipeline failed.  Do not free the entry or remove it from the
     * list.
     */
    if (ret_value<0 && point_of_no_return) {
        if(ent->chunk)
            ent->chunk = H5D_istore_chunk_xfree(ent->chunk,&(io_info->dset->shared->dcpl_cache.pline));
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_flush_entry() */


/*-------------------------------------------------------------------------
 * Function:    H5D_istore_preempt
 *
 * Purpose:     Preempts the specified entry from the cache, flushing it to
 *              disk if necessary.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_preempt(const H5D_io_info_t *io_info, H5D_rdcc_ent_t * ent, hbool_t flush)
{
    H5D_rdcc_t *rdcc = &(io_info->dset->shared->cache.chunk);
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_preempt)

    assert(io_info);
    assert(ent);
    assert(!ent->locked);
    assert(ent->idx < rdcc->nslots);

    if(flush) {
	/* Flush */
	if(H5D_istore_flush_entry(io_info, ent, TRUE) < 0)
	    HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")
    }
    else {
        /* Don't flush, just free chunk */
	if(ent->chunk != NULL)
	    ent->chunk = H5D_istore_chunk_xfree(ent->chunk,&(io_info->dset->shared->dcpl_cache.pline));
    }

    /* Unlink from list */
    if(ent->prev)
	ent->prev->next = ent->next;
    else
	rdcc->head = ent->next;
    if(ent->next)
	ent->next->prev = ent->prev;
    else
	rdcc->tail = ent->prev;
    ent->prev = ent->next = NULL;

    /* Remove from cache */
    rdcc->slot[ent->idx] = NULL;
    ent->idx = UINT_MAX;
    rdcc->nbytes_used -= ent->chunk_size;
    --rdcc->nused;

    /* Free */
    H5FL_FREE(H5D_rdcc_ent_t, ent);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_preempt() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_flush
 *
 * Purpose:	Writes all dirty chunks to disk and optionally preempts them
 *		from the cache.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_flush (H5D_t *dset, hid_t dxpl_id, unsigned flags)
{
    H5D_io_info_t io_info;              /* Temporary I/O info object */
    H5D_dxpl_cache_t _dxpl_cache;       /* Data transfer property cache buffer */
    H5D_dxpl_cache_t *dxpl_cache=&_dxpl_cache;   /* Data transfer property cache */
    H5D_rdcc_t *rdcc = &(dset->shared->cache.chunk);
    int		nerrors=0;
    H5D_rdcc_ent_t	*ent=NULL, *next=NULL;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_flush, FAIL)

    /* Fill the DXPL cache values for later use */
    if (H5D_get_dxpl_cache(dxpl_id,&dxpl_cache)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't fill dxpl cache")

    /* Construct dataset I/O info */
    H5D_BUILD_IO_INFO(&io_info,dset,dxpl_cache,dxpl_id,NULL);

    for (ent=rdcc->head; ent; ent=next) {
	next = ent->next;
	if ((flags&H5F_FLUSH_CLEAR_ONLY)) {
            /* Just mark cache entry as clean */
            ent->dirty = FALSE;
        } /* end if */
	else if ((flags&H5F_FLUSH_INVALIDATE)) {
	    if (H5D_istore_preempt(&io_info, ent, TRUE )<0)
		nerrors++;
	} else {
	    if (H5D_istore_flush_entry(&io_info, ent, FALSE)<0)
		nerrors++;
	}
    } /* end for */

    if (nerrors)
	HGOTO_ERROR (H5E_IO, H5E_CANTFLUSH, FAIL, "unable to flush one or more raw data chunks")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_flush() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_dest
 *
 * Purpose:	Destroy the entire chunk cache by flushing dirty entries,
 *		preempting all entries, and freeing the cache itself.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_dest (H5D_t *dset, hid_t dxpl_id)
{
    H5D_io_info_t io_info;              /* Temporary I/O info object */
    H5D_dxpl_cache_t _dxpl_cache;       /* Data transfer property cache buffer */
    H5D_dxpl_cache_t *dxpl_cache=&_dxpl_cache;   /* Data transfer property cache */
    H5D_rdcc_t		*rdcc = &(dset->shared->cache.chunk);
    int		nerrors=0;
    H5D_rdcc_ent_t	*ent=NULL, *next=NULL;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_dest, FAIL)

    assert(dset);

    /* Fill the DXPL cache values for later use */
    if (H5D_get_dxpl_cache(dxpl_id,&dxpl_cache)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't fill dxpl cache")

    /* Construct dataset I/O info */
    H5D_BUILD_IO_INFO(&io_info,dset,dxpl_cache,dxpl_id,NULL);

    /* Flush all the cached chunks */
    for (ent=rdcc->head; ent; ent=next) {
#ifdef H5D_ISTORE_DEBUG
	HDfputc('c', stderr);
	HDfflush(stderr);
#endif
	next = ent->next;
	if (H5D_istore_preempt(&io_info, ent, TRUE )<0)
	    nerrors++;
    }
    if (nerrors)
	HGOTO_ERROR (H5E_IO, H5E_CANTFLUSH, FAIL, "unable to flush one or more raw data chunks")

    if(rdcc->slot)
        H5FL_SEQ_FREE (H5D_rdcc_ent_ptr_t,rdcc->slot);
    HDmemset (rdcc, 0, sizeof(H5D_rdcc_t));

    /* Free the raw B-tree node buffer */
    if(dset->shared->layout.u.chunk.btree_shared==NULL)
        HGOTO_ERROR (H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
    if(H5RC_DEC(dset->shared->layout.u.chunk.btree_shared)<0)
	HGOTO_ERROR (H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_dest() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_shared_create
 *
 * Purpose:	Create & initialize B-tree shared info
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Monday, September 27, 2004
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_shared_create (const H5F_t *f, H5O_layout_t *layout)
{
    H5B_shared_t *shared;               /* Shared B-tree node info */
    size_t	u;                      /* Local index variable */
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_shared_create)

    /* Allocate space for the shared structure */
    if(NULL==(shared=H5FL_MALLOC(H5B_shared_t)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for shared B-tree info")

    /* Set up the "global" information for this file's groups */
    shared->type= H5B_ISTORE;
    shared->two_k=2*H5F_KVALUE(f,H5B_ISTORE);
    shared->sizeof_rkey = 4 +			/*storage size		*/
                         4 +			/*filter mask		*/
                         layout->u.chunk.ndims*8;	/*dimension indices	*/
    assert(shared->sizeof_rkey);
    shared->sizeof_rnode = H5B_nodesize(f, shared, &shared->sizeof_keys);
    assert(shared->sizeof_rnode);
    if(NULL==(shared->page=H5FL_BLK_MALLOC(chunk_page,shared->sizeof_rnode)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree page")
#ifdef H5_CLEAR_MEMORY
HDmemset(shared->page, 0, shared->sizeof_rnode);
#endif /* H5_CLEAR_MEMORY */
    if(NULL==(shared->nkey=H5FL_SEQ_MALLOC(size_t,(size_t)(2*H5F_KVALUE(f,H5B_ISTORE)+1))))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for B-tree page")

    /* Initialize the offsets into the native key buffer */
    for(u=0; u<(2*H5F_KVALUE(f,H5B_ISTORE)+1); u++)
        shared->nkey[u]=u*H5B_ISTORE[0].sizeof_nkey;

    /* Make shared B-tree info reference counted */
    if(NULL==(layout->u.chunk.btree_shared=H5RC_create(shared,H5D_istore_shared_free)))
	HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, FAIL, "can't create ref-count wrapper for shared B-tree info")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_shared_create() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_shared_free
 *
 * Purpose:	Free B-tree shared info
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *              Thursday, July  8, 2004
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_shared_free (void *_shared)
{
    H5B_shared_t *shared = (H5B_shared_t *)_shared;

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_shared_free)

    /* Free the raw B-tree node buffer */
    H5FL_BLK_FREE(chunk_page,shared->page);

    /* Free the B-tree native key offsets buffer */
    H5FL_SEQ_FREE(size_t,shared->nkey);

    /* Free the shared B-tree info */
    H5FL_FREE(H5B_shared_t,shared);

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5D_istore_shared_free() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_prune
 *
 * Purpose:	Prune the cache by preempting some things until the cache has
 *		room for something which is SIZE bytes.  Only unlocked
 *		entries are considered for preemption.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_prune (const H5D_io_info_t *io_info, size_t size)
{
    int		i, j, nerrors=0;
    const H5D_rdcc_t	*rdcc = &(io_info->dset->shared->cache.chunk);
    size_t		total = rdcc->nbytes_max;
    const int		nmeth=2;	/*number of methods		*/
    int		        w[1];		/*weighting as an interval	*/
    H5D_rdcc_ent_t	*p[2], *cur;	/*list pointers			*/
    H5D_rdcc_ent_t	*n[2];		/*list next pointers		*/
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_prune)

    /*
     * Preemption is accomplished by having multiple pointers (currently two)
     * slide down the list beginning at the head. Pointer p(N+1) will start
     * traversing the list when pointer pN reaches wN percent of the original
     * list.  In other words, preemption method N gets to consider entries in
     * approximate least recently used order w0 percent before method N+1
     * where 100% means tha method N will run to completion before method N+1
     * begins.  The pointers participating in the list traversal are each
     * given a chance at preemption before any of the pointers are advanced.
     */
    w[0] = (int)(rdcc->nused * H5F_RDCC_W0(io_info->dset->ent.file));
    p[0] = rdcc->head;
    p[1] = NULL;

    while ((p[0] || p[1]) && rdcc->nbytes_used+size>total) {

	/* Introduce new pointers */
	for (i=0; i<nmeth-1; i++)
            if (0==w[i])
                p[i+1] = rdcc->head;

	/* Compute next value for each pointer */
	for (i=0; i<nmeth; i++)
            n[i] = p[i] ? p[i]->next : NULL;

	/* Give each method a chance */
	for (i=0; i<nmeth && rdcc->nbytes_used+size>total; i++) {
	    if (0==i && p[0] && !p[0]->locked &&
                    ((0==p[0]->rd_count && 0==p[0]->wr_count) ||
                     (0==p[0]->rd_count && p[0]->chunk_size==p[0]->wr_count) ||
                     (p[0]->chunk_size==p[0]->rd_count && 0==p[0]->wr_count))) {
		/*
		 * Method 0: Preempt entries that have been completely written
		 * and/or completely read but not entries that are partially
		 * written or partially read.
		 */
		cur = p[0];
#ifdef H5D_ISTORE_DEBUG
		HDputc('.', stderr);
		HDfflush(stderr);
#endif

	    } else if (1==i && p[1] && !p[1]->locked) {
		/*
		 * Method 1: Preempt the entry without regard to
		 * considerations other than being locked.  This is the last
		 * resort preemption.
		 */
		cur = p[1];
#ifdef H5D_ISTORE_DEBUG
		HDputc(':', stderr);
		HDfflush(stderr);
#endif

	    } else {
		/* Nothing to preempt at this point */
		cur= NULL;
	    }

	    if (cur) {
		for (j=0; j<nmeth; j++) {
		    if (p[j]==cur)
                        p[j] = NULL;
		    if (n[j]==cur)
                        n[j] = cur->next;
		}
		if (H5D_istore_preempt(io_info, cur, TRUE)<0)
                    nerrors++;
	    }
	}

	/* Advance pointers */
	for (i=0; i<nmeth; i++)
            p[i] = n[i];
	for (i=0; i<nmeth-1; i++)
            w[i] -= 1;
    }

    if (nerrors)
	HGOTO_ERROR (H5E_IO, H5E_CANTFLUSH, FAIL, "unable to preempt one or more raw data cache entry")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_prune() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_lock
 *
 * Purpose:	Return a pointer to a dataset chunk.  The pointer points
 *		directly into the chunk cache and should not be freed
 *		by the caller but will be valid until it is unlocked.  The
 *		input value IDX_HINT is used to speed up cache lookups and
 *		it's output value should be given to H5F_istore_unlock().
 *		IDX_HINT is ignored if it is out of range, and if it points
 *		to the wrong entry then we fall back to the normal search
 *		method.
 *
 *		If RELAX is non-zero and the chunk isn't in the cache then
 *		don't try to read it from the file, but just allocate an
 *		uninitialized buffer to hold the result.  This is intended
 *		for output functions that are about to overwrite the entire
 *		chunk.
 *
 * Return:	Success:	Ptr to a file chunk.
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static void *
H5D_istore_lock(const H5D_io_info_t *io_info,
    H5D_istore_ud1_t *udata, hbool_t relax, unsigned *idx_hint/*in,out*/)
{
    H5D_t *dset=io_info->dset;          /* Local pointer to the dataset info */
    const H5O_pline_t  *pline=&(dset->shared->dcpl_cache.pline);    /* I/O pipeline info */
    const H5O_layout_t *layout=&(dset->shared->layout); /* Dataset layout */
    const H5O_fill_t *fill=&(dset->shared->dcpl_cache.fill);    /* Fill value info */
    H5D_fill_time_t fill_time=dset->shared->dcpl_cache.fill_time;  /* Fill time */
    H5D_rdcc_t		*rdcc = &(dset->shared->cache.chunk);/*raw data chunk cache*/
    H5D_rdcc_ent_t	*ent = NULL;		/*cache entry		*/
    unsigned		idx=0;			/*hash index number	*/
    hbool_t		found = FALSE;		/*already in cache?	*/
    unsigned		u;			/*counters		*/
    size_t		chunk_size;		/*size of a chunk	*/
    void		*chunk=NULL;		/*the file chunk	*/
    void		*ret_value;	        /*return value		*/

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_lock)

    assert(io_info);
    assert(dset);
    assert(io_info->dxpl_cache);
    assert(io_info->store);
    assert(TRUE==H5P_isa_class(io_info->dxpl_id,H5P_DATASET_XFER));

    /* Get the chunk's size */
    assert(layout->u.chunk.size>0);
    H5_ASSIGN_OVERFLOW(chunk_size,layout->u.chunk.size,hsize_t,size_t);

    /* Search for the chunk in the cache */
    if (rdcc->nslots>0) {
        idx=H5D_HASH(dset->shared,io_info->store->chunk.index);
        ent = rdcc->slot[idx];

        if (ent) {
            for (u=0, found=TRUE; u<layout->u.chunk.ndims; u++) {
                if (io_info->store->chunk.offset[u]!=ent->offset[u]) {
                    found = FALSE;
                    break;
                } /* end if */
            } /* end for */
        } /* end if */
    } /* end if */

    if (found) {
        /*
         * Already in the cache.  Count a hit.
         */
#ifdef H5D_ISTORE_DEBUG
        rdcc->nhits++;
#endif /* H5D_ISTORE_DEBUG */

    } else if (relax) {
        /*
         * Not in the cache, but we're about to overwrite the whole thing
         * anyway, so just allocate a buffer for it but don't initialize that
         * buffer with the file contents. Count this as a hit instead of a
         * miss because we saved ourselves lots of work.
         */
#ifdef H5D_ISTORE_DEBUG
        HDputc('w', stderr);
        HDfflush(stderr);
        rdcc->nhits++;
#endif
        if (NULL==(chunk=H5D_istore_chunk_alloc (chunk_size,pline)))
            HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for raw data chunk")

    } else {
        H5D_istore_ud1_t tmp_udata;		/*B-tree pass-through	*/
        haddr_t chunk_addr;             /* Address of chunk on disk */

        if(udata!=NULL)
            chunk_addr = udata->addr;
        else {
            /* Point at temporary storage for B-tree pass through */
            udata = &tmp_udata;

            /*
             * Not in the cache.  Read it from the file and count this as a miss
             * if it's in the file or an init if it isn't.
             */
            chunk_addr = H5D_istore_get_addr(io_info, udata);
        } /* end else */

        if (H5F_addr_defined(chunk_addr)) {
            size_t		chunk_alloc = 0;		/*allocated chunk size	*/

            /*
             * The chunk exists on disk.
             */
            /* Chunk size on disk isn't [likely] the same size as the final chunk
             * size in memory, so allocate memory big enough. */
            chunk_alloc = udata->common.key.nbytes;
            if (NULL==(chunk = H5D_istore_chunk_alloc (chunk_alloc,pline)))
                HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for raw data chunk")
            if (H5F_block_read(dset->ent.file, H5FD_MEM_DRAW, chunk_addr, udata->common.key.nbytes, io_info->dxpl_id, chunk)<0)
                HGOTO_ERROR (H5E_IO, H5E_READERROR, NULL, "unable to read raw data chunk")

            if (pline->nused)
                if (H5Z_pipeline(pline, H5Z_FLAG_REVERSE, &(udata->common.key.filter_mask), io_info->dxpl_cache->err_detect,
                         io_info->dxpl_cache->filter_cb, &(udata->common.key.nbytes), &chunk_alloc, &chunk)<0) {
                    HGOTO_ERROR(H5E_PLINE, H5E_READERROR, NULL, "data pipeline read failed")
                }
#ifdef H5D_ISTORE_DEBUG
            rdcc->nmisses++;
#endif /* H5D_ISTORE_DEBUG */
        } else {
            H5D_fill_value_t	fill_status;

#ifdef OLD_WAY
            /* Clear the error stack from not finding the chunk on disk */
            H5E_clear();
#endif /* OLD_WAY */

            /* Chunk size on disk isn't [likely] the same size as the final chunk
             * size in memory, so allocate memory big enough. */
            if (NULL==(chunk = H5D_istore_chunk_alloc (chunk_size,pline)))
                HGOTO_ERROR (H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for raw data chunk")

            if (H5P_is_fill_value_defined(fill, &fill_status) < 0)
                HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, NULL, "can't tell if fill value defined")

            if(fill_time==H5D_FILL_TIME_ALLOC ||
                    (fill_time==H5D_FILL_TIME_IFSET && fill_status==H5D_FILL_VALUE_USER_DEFINED)) {
                /*
                 * The chunk doesn't exist in the file.  Replicate the fill
                 * value throughout the chunk, if the fill value is defined.
                 */
                if(fill->buf) {
                    size_t elmts_per_chunk;             /* # of elements per chunk */

                    /* Sanity check */
                    HDassert(0 == (chunk_size % fill->size));
                    elmts_per_chunk = chunk_size / fill->size;

                    /* If necessary, convert fill value datatypes (which copies VL components, etc.) */
                    if(H5T_detect_class(dset->shared->type, H5T_VLEN) > 0) {
                        H5T_path_t *tpath;      /* Datatype conversion path */
                        uint8_t *bkg_buf = NULL;    /* Background conversion buffer */
                        H5T_t *mem_type;            /* Pointer to memory datatype */
                        size_t mem_type_size, file_type_size;       /* Size of datatype in memory and on disk */
                        hid_t mem_tid;              /* Memory version of disk datatype */

                        /* Create temporary datatype for conversion operation */
                        if(NULL == (mem_type = H5T_copy(dset->shared->type, H5T_COPY_REOPEN)))
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCOPY, NULL, "unable to copy file datatype")
                        if((mem_tid = H5I_register(H5I_DATATYPE, mem_type)) < 0) {
                            H5T_close(mem_type);
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, NULL, "unable to register memory datatype")
                        } /* end if */

                        /* Retrieve sizes of memory & file datatypes */
                        mem_type_size = H5T_get_size(mem_type);
                        HDassert(mem_type_size > 0);
                        file_type_size = H5T_get_size(dset->shared->type);
                        HDassert(file_type_size == fill->size);

                        /* Get the datatype conversion path for this operation */
                        if(NULL == (tpath = H5T_path_find(dset->shared->type, mem_type, NULL, NULL, io_info->dxpl_id))) {
                            H5I_dec_ref(mem_tid);
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to convert between src and dst datatypes")
                        } /* end if */

                        /* Allocate a background buffer, if necessary */
                        if(H5T_path_bkg(tpath) && NULL == (bkg_buf = H5FL_BLK_CALLOC(type_conv, (elmts_per_chunk * MAX(mem_type_size, file_type_size))))) {
                            H5I_dec_ref(mem_tid);
                            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
                        } /* end if */

                        /* Make a copy of the (disk-based) fill value into the chunk buffer */
                        HDmemcpy(chunk, fill->buf, file_type_size);

                        /* Type convert the chunk buffer, to copy any VL components */
                        if(H5T_convert(tpath, dset->shared->type_id, mem_tid, (size_t)1, (size_t)0, (size_t)0, chunk, bkg_buf, io_info->dxpl_id) < 0) {
                            if(bkg_buf)
                                H5FL_BLK_FREE(type_conv, bkg_buf);
                            H5I_dec_ref(mem_tid);
                            HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, NULL, "data type conversion failed")
                        } /* end if */

                        /* Replicate the fill value into the cached buffer */
                        H5V_array_fill(chunk, chunk, mem_type_size, elmts_per_chunk);

                        /* Get the inverse datatype conversion path for this operation */
                        if(NULL == (tpath = H5T_path_find(mem_type, dset->shared->type, NULL, NULL, io_info->dxpl_id))) {
                            if(bkg_buf)
                                H5FL_BLK_FREE(type_conv, bkg_buf);
                            H5I_dec_ref(mem_tid);
                            HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, NULL, "unable to convert between src and dst datatypes")
                        } /* end if */

                        /* Allocate or reset the background buffer, if necessary */
                        if(H5T_path_bkg(tpath)) {
                            if(bkg_buf)
                                HDmemset(bkg_buf, 0, MAX(mem_type_size, file_type_size));
                            else {
                                if(NULL == (bkg_buf = H5FL_BLK_CALLOC(type_conv, (elmts_per_chunk * MAX(mem_type_size, file_type_size))))) {
                                    H5I_dec_ref(mem_tid);
                                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")
                                } /* end if */
                            } /* end else */
                        } /* end if */

                        /* Type convert the chunk buffer, to copy any VL components */
                        if(H5T_convert(tpath, mem_tid, dset->shared->type_id, elmts_per_chunk, (size_t)0, (size_t)0, chunk, bkg_buf, io_info->dxpl_id) < 0) {
                            if(bkg_buf)
                                H5FL_BLK_FREE(type_conv, bkg_buf);
                            H5I_dec_ref(mem_tid);
                            HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, NULL, "data type conversion failed")
                        } /* end if */

                        /* Release resources used */
                        if(bkg_buf)
                            H5FL_BLK_FREE(type_conv, bkg_buf);
                        H5I_dec_ref(mem_tid);
                    } /* end if */
                    else 
                        /* Replicate the [non-VL] fill value into chunk */
                        H5V_array_fill(chunk, fill->buf, fill->size, elmts_per_chunk);
                } /* end if */
                else {
                    /*
                     * The chunk doesn't exist in the file and no fill value was
                     * specified.  Assume all zeros.
                     */
                    HDmemset (chunk, 0, chunk_size);
                } /* end else */
            } /* end if */
#ifdef H5_CLEAR_MEMORY
            else
                HDmemset(chunk, 0, chunk_size);
#endif /* H5_CLEAR_MEMORY */
#ifdef H5D_ISTORE_DEBUG
            rdcc->ninits++;
#endif /* H5D_ISTORE_DEBUG */
        } /* end else */
    }
    assert (found || chunk_size>0);

    if (!found && rdcc->nslots>0 && chunk_size<=rdcc->nbytes_max &&
            (!ent || !ent->locked)) {
        /*
         * Add the chunk to the cache only if the slot is not already locked.
         * Preempt enough things from the cache to make room.
         */
        if (ent) {
#ifdef H5D_ISTORE_DEBUG
            HDputc('#', stderr);
            HDfflush(stderr);
#endif
            if (H5D_istore_preempt(io_info, ent, TRUE)<0)
                HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to preempt chunk from cache")
        }
        if (H5D_istore_prune(io_info, chunk_size)<0)
            HGOTO_ERROR(H5E_IO, H5E_CANTINIT, NULL, "unable to preempt chunk(s) from cache")

        /* Create a new entry */
        ent = H5FL_MALLOC(H5D_rdcc_ent_t);
        ent->locked = 0;
        ent->dirty = FALSE;
        ent->chunk_size = chunk_size;
        ent->alloc_size = chunk_size;
        for (u=0; u<layout->u.chunk.ndims; u++)
            ent->offset[u] = io_info->store->chunk.offset[u];
        ent->rd_count = chunk_size;
        ent->wr_count = chunk_size;
        ent->chunk = chunk;

        /* Add it to the cache */
        assert(NULL==rdcc->slot[idx]);
        rdcc->slot[idx] = ent;
        ent->idx = idx;
        rdcc->nbytes_used += chunk_size;
        rdcc->nused++;

        /* Add it to the linked list */
        ent->next = NULL;
        if (rdcc->tail) {
            rdcc->tail->next = ent;
            ent->prev = rdcc->tail;
            rdcc->tail = ent;
        } else {
            rdcc->head = rdcc->tail = ent;
            ent->prev = NULL;
        }
        found = TRUE;
    } else if (!found) {
        /*
         * The chunk is larger than the entire cache so we don't cache it.
         * This is the reason all those arguments have to be repeated for the
         * unlock function.
         */
        ent = NULL;
        idx = UINT_MAX;

    } else {
        /*
         * The chunk is not at the beginning of the cache; move it backward
         * by one slot.  This is how we implement the LRU preemption
         * algorithm.
         */
        assert(ent);
        if (ent->next) {
            if (ent->next->next)
                ent->next->next->prev = ent;
            else
                rdcc->tail = ent;
            ent->next->prev = ent->prev;
            if (ent->prev)
                ent->prev->next = ent->next;
            else
                rdcc->head = ent->next;
            ent->prev = ent->next;
            ent->next = ent->next->next;
            ent->prev->next = ent;
        }
    }

    /* Lock the chunk into the cache */
    if (ent) {
        assert (!ent->locked);
        ent->locked = TRUE;
        chunk = ent->chunk;
    }

    if (idx_hint)
        *idx_hint = idx;

    /* Set return value */
    ret_value = chunk;

done:
    if (!ret_value)
        if(chunk)
            chunk=H5D_istore_chunk_xfree (chunk,pline);
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_lock() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_unlock
 *
 * Purpose:	Unlocks a previously locked chunk. The LAYOUT, COMP, and
 *		OFFSET arguments should be the same as for H5F_rdcc_lock().
 *		The DIRTY argument should be set to non-zero if the chunk has
 *		been modified since it was locked. The IDX_HINT argument is
 *		the returned index hint from the lock operation and BUF is
 *		the return value from the lock.
 *
 *		The NACCESSED argument should be the number of bytes accessed
 *		for reading or writing (depending on the value of DIRTY).
 *		It's only purpose is to provide additional information to the
 *		preemption policy.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5D_istore_unlock(const H5D_io_info_t *io_info,
    hbool_t dirty, unsigned idx_hint, uint8_t *chunk, size_t naccessed)
{
    const H5O_layout_t *layout=&(io_info->dset->shared->layout); /* Dataset layout */
    const H5D_rdcc_t	*rdcc = &(io_info->dset->shared->cache.chunk);
    H5D_rdcc_ent_t	*ent = NULL;
    unsigned		u;
    herr_t              ret_value=SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_unlock)

    assert(io_info);

    if (UINT_MAX==idx_hint) {
        /*
         * It's not in the cache, probably because it's too big.  If it's
         * dirty then flush it to disk.  In any case, free the chunk.
         * Note: we have to copy the layout and filter messages so we
         *	 don't discard the `const' qualifier.
         */
        if (dirty) {
            H5D_rdcc_ent_t x;

            HDmemset (&x, 0, sizeof x);
            x.dirty = TRUE;
            for (u=0; u<layout->u.chunk.ndims; u++)
                x.offset[u] = io_info->store->chunk.offset[u];
            assert(layout->u.chunk.size>0);
            H5_ASSIGN_OVERFLOW(x.chunk_size,layout->u.chunk.size,hsize_t,size_t);
            x.alloc_size = x.chunk_size;
            x.chunk = chunk;

            if (H5D_istore_flush_entry(io_info, &x, TRUE)<0)
                HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "cannot flush indexed storage buffer")
        } else {
            if(chunk)
                chunk=H5D_istore_chunk_xfree (chunk,&(io_info->dset->shared->dcpl_cache.pline));
        }
    } else {
        /* Sanity check */
	assert(idx_hint<rdcc->nslots);
	assert(rdcc->slot[idx_hint]);
	assert(rdcc->slot[idx_hint]->chunk==chunk);

        /*
         * It's in the cache so unlock it.
         */
        ent = rdcc->slot[idx_hint];
        assert (ent->locked);
        if (dirty) {
            ent->dirty = TRUE;
            ent->wr_count -= MIN (ent->wr_count, naccessed);
        } else {
            ent->rd_count -= MIN (ent->rd_count, naccessed);
        }
        ent->locked = FALSE;
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_unlock() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_readvv
 *
 * Purpose:	Reads a multi-dimensional buffer from (part of) an indexed raw
 *		storage array.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Wednesday, May  7, 2003
 *
 *-------------------------------------------------------------------------
 */
ssize_t
H5D_istore_readvv(const H5D_io_info_t *io_info,
    size_t chunk_max_nseq, size_t *chunk_curr_seq, size_t chunk_len_arr[], hsize_t chunk_offset_arr[],
    size_t mem_max_nseq, size_t *mem_curr_seq, size_t mem_len_arr[], hsize_t mem_offset_arr[],
    void *buf)
{
    H5D_t *dset=io_info->dset;          /* Local pointer to the dataset info */
    H5D_istore_ud1_t udata;		/*B-tree pass-through	*/
    haddr_t	        chunk_addr;     /* Chunk address on disk */
    size_t		u;              /* Local index variables */
    ssize_t             ret_value;      /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_readvv, FAIL)

    /* Check args */
    HDassert(io_info);
    HDassert(dset && H5D_CHUNKED==dset->shared->layout.type);
    HDassert(dset->shared->layout.u.chunk.ndims>0 && dset->shared->layout.u.chunk.ndims<=H5O_LAYOUT_NDIMS);
    HDassert(io_info->dxpl_cache);
    HDassert(io_info->store);
    HDassert(chunk_len_arr);
    HDassert(chunk_offset_arr);
    HDassert(mem_len_arr);
    HDassert(mem_offset_arr);
    HDassert(buf);

    /* Get the address of this chunk on disk */
#ifdef QAK
HDfprintf(stderr,"%s: io_info->store->chunk.offset={",FUNC);
for(u=0; u<dset->shared->layout.u.chunk.ndims; u++)
    HDfprintf(stderr,"%Hd%s",io_info->store->chunk.offset[u],(u<(dset->shared->layout.u.chunk.ndims-1) ? ", " : "}\n"));
#endif /* QAK */
    chunk_addr = H5D_istore_get_addr(io_info, &udata);
#ifdef QAK
HDfprintf(stderr,"%s: chunk_addr=%a, chunk_size=%Zu\n",FUNC,chunk_addr,dset->shared->layout.u.chunk.size);
HDfprintf(stderr,"%s: chunk_len_arr[%Zu]=%Zu\n",FUNC,*chunk_curr_seq,chunk_len_arr[*chunk_curr_seq]);
HDfprintf(stderr,"%s: chunk_offset_arr[%Zu]=%Hu\n",FUNC,*chunk_curr_seq,chunk_offset_arr[*chunk_curr_seq]);
HDfprintf(stderr,"%s: mem_len_arr[%Zu]=%Zu\n",FUNC,*mem_curr_seq,mem_len_arr[*mem_curr_seq]);
HDfprintf(stderr,"%s: mem_offset_arr[%Zu]=%Hu\n",FUNC,*mem_curr_seq,mem_offset_arr[*mem_curr_seq]);
HDfprintf(stderr,"%s: buf=%p\n",FUNC,buf);
#endif /* QAK */

    /*
     * If the chunk is too large to load into the cache and it has no
     * filters in the pipeline (i.e. not compressed) and if the address
     * for the chunk has been defined, then don't load the chunk into the
     * cache, just read the data from it directly.
     *
     * If MPI based VFD is used, must bypass the
     * chunk-cache scheme because other MPI processes could be
     * writing to other elements in the same chunk.  Do a direct
     * read-through of only the elements requested.
     */
    if (dset->shared->dcpl_cache.pline.nused==0 && ((dset->shared->layout.u.chunk.size>dset->shared->cache.chunk.nbytes_max && chunk_addr!=HADDR_UNDEF)
            || (IS_H5FD_MPI(dset->ent.file) && (H5F_ACC_RDWR & H5F_get_intent(dset->ent.file))))) {
        H5D_io_info_t chk_io_info;      /* Temporary I/O info object */
        H5D_storage_t chk_store;        /* Chunk storage information */

        /* Set up the storage information for the chunk */
        chk_store.contig.dset_addr=chunk_addr;
        chk_store.contig.dset_size=(hsize_t)dset->shared->layout.u.chunk.size;

        /* Set up new dataset I/O info */
        H5D_BUILD_IO_INFO(&chk_io_info,dset,io_info->dxpl_cache,io_info->dxpl_id,&chk_store);

        /* Do I/O directly on chunk without reading it into the cache */
        if ((ret_value=H5D_contig_readvv(&chk_io_info, chunk_max_nseq, chunk_curr_seq, chunk_len_arr, chunk_offset_arr, mem_max_nseq, mem_curr_seq, mem_len_arr, mem_offset_arr, buf))<0)
            HGOTO_ERROR (H5E_IO, H5E_READERROR, FAIL, "unable to read raw data to file")
    } /* end if */
    else {
        uint8_t         *chunk;         /* Pointer to cached chunk in memory */
        unsigned        idx_hint=0;     /* Cache index hint      */
        ssize_t         naccessed;      /* Number of bytes accessed in chunk */

        /* If the chunk address is not defined, check if the fill value is
         * undefined also.  If both situations hold, don't bother copying
         * values to the destination buffer, since they will just be
         * garbage.
         *
         * Ideally, this will eventually be checked at a higher level and
         * the entire I/O operation on the chunk will be skipped.  -QAK
         */
        if(!H5F_addr_defined(chunk_addr)) {
            const H5O_fill_t *fill=&(dset->shared->dcpl_cache.fill);    /* Fill value info */
            H5D_fill_time_t fill_time=dset->shared->dcpl_cache.fill_time;  /* Fill time */
            H5D_fill_value_t	fill_status;
            H5D_rdcc_t		*rdcc = &(dset->shared->cache.chunk);/*raw data chunk cache*/
            hbool_t		found = FALSE;		/*already in cache?	*/

            /* Check if the chunk is in the cache (but hasn't been written to disk yet) */
            if (rdcc->nslots>0) {
                unsigned idx=H5D_HASH(dset->shared,io_info->store->chunk.index); /* Cache entry index */
                H5D_rdcc_ent_t	*ent = rdcc->slot[idx]; /* Cache entry */

                /* Potential match... */
                if (ent) {
                    for (u=0, found=TRUE; u<dset->shared->layout.u.chunk.ndims; u++) {
                        if (io_info->store->chunk.offset[u]!=ent->offset[u]) {
                            found = FALSE;
                            break;
                        } /* end if */
                    } /* end for */
                } /* end if */
            } /* end if */

            /* If the chunk is in the cache, then it must have valid data */
            if(!found) {
                /* Check if the fill value is defined */
                if (H5P_is_fill_value_defined(fill, &fill_status) < 0)
                    HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't tell if fill value defined")

                /* If we are never to return fill values, or if we would return them
                 * but they aren't set, process the entire set of I/O vectors and
                 * get out now.
                 */
                if(fill_time==H5D_FILL_TIME_NEVER ||
                        (fill_time==H5D_FILL_TIME_IFSET && fill_status!=H5D_FILL_VALUE_USER_DEFINED)) {
                    size_t size;                /* Size of sequence in bytes */
                    size_t v;                   /* Local index variable */
                    ssize_t bytes_processed=0;  /* Eventual return value */

                    /* Work through all the sequences */
                    for(u=*mem_curr_seq, v=*chunk_curr_seq; u<mem_max_nseq && v<chunk_max_nseq; ) {
                        /* Choose smallest buffer to write */
                        if(chunk_len_arr[v]<mem_len_arr[u])
                            size=chunk_len_arr[v];
                        else
                            size=mem_len_arr[u];

                        /* Update source information */
                        chunk_len_arr[v]-=size;
                        chunk_offset_arr[v]+=size;
                        if(chunk_len_arr[v]==0)
                            v++;

                        /* Update destination information */
                        mem_len_arr[u]-=size;
                        mem_offset_arr[u]+=size;
                        if(mem_len_arr[u]==0)
                            u++;

                        /* Increment number of bytes copied */
                        bytes_processed+=(ssize_t)size;
                    } /* end for */

                    /* Update current sequence vectors */
                    *mem_curr_seq=u;
                    *chunk_curr_seq=v;

                    HGOTO_DONE(bytes_processed)
                } /* end if */
            } /* end if */
        } /* end if */

        /*
         * Lock the chunk, copy from application to chunk, then unlock the
         * chunk.
         */
        if (NULL==(chunk=H5D_istore_lock(io_info, &udata, FALSE, &idx_hint)))
            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to read raw data chunk")

        /* Use the vectorized memory copy routine to do actual work */
        if((naccessed=H5V_memcpyvv(buf,mem_max_nseq,mem_curr_seq,mem_len_arr,mem_offset_arr,chunk,chunk_max_nseq,chunk_curr_seq,chunk_len_arr,chunk_offset_arr))<0)
            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "vectorized memcpy failed")

        H5_CHECK_OVERFLOW(naccessed,ssize_t,size_t);
        if (H5D_istore_unlock(io_info, FALSE, idx_hint, chunk, (size_t)naccessed)<0)
            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "unable to unlock raw data chunk")

        /* Set return value */
        ret_value=naccessed;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D_istore_readvv() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_writevv
 *
 * Purpose:	Writes a multi-dimensional buffer to (part of) an indexed raw
 *		storage array.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Quincey Koziol
 *		Friday, May  2, 2003
 *
 *-------------------------------------------------------------------------
 */
ssize_t
H5D_istore_writevv(const H5D_io_info_t *io_info,
    size_t chunk_max_nseq, size_t *chunk_curr_seq, size_t chunk_len_arr[], hsize_t chunk_offset_arr[],
    size_t mem_max_nseq, size_t *mem_curr_seq, size_t mem_len_arr[], hsize_t mem_offset_arr[],
    const void *buf)
{
    H5D_t *dset = io_info->dset;          /* Local pointer to the dataset info */
    H5D_istore_ud1_t udata;		/*B-tree pass-through	*/
    haddr_t	        chunk_addr;     /* Chunk address on disk */
    size_t		u;              /* Local index variables */
    ssize_t             ret_value;      /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_writevv, FAIL)

    /* Check args */
    HDassert(io_info);
    HDassert(dset && H5D_CHUNKED==dset->shared->layout.type);
    HDassert(dset->shared->layout.u.chunk.ndims>0 && dset->shared->layout.u.chunk.ndims<=H5O_LAYOUT_NDIMS);
    HDassert(io_info->dxpl_cache);
    HDassert(io_info->store);
    HDassert(chunk_len_arr);
    HDassert(chunk_offset_arr);
    HDassert(mem_len_arr);
    HDassert(mem_offset_arr);
    HDassert(buf);

    /* Get the address of this chunk on disk */
#ifdef QAK
HDfprintf(stderr,"%s: io_info->store->chunk.offset={",FUNC);
for(u=0; u<dset->shared->layout.u.chunk.ndims; u++)
    HDfprintf(stderr,"%Hd%s",io_info->store->chunk.offset[u],(u<(dset->shared->layout.u.chunk.ndims-1) ? ", " : "}\n"));
#endif /* QAK */
    chunk_addr = H5D_istore_get_addr(io_info, &udata);
#ifdef QAK
HDfprintf(stderr,"%s: chunk_addr=%a, chunk_size=%Zu\n",FUNC,chunk_addr,dset->shared->layout.u.chunk.size);
HDfprintf(stderr,"%s: chunk_len_arr[%Zu]=%Zu\n",FUNC,*chunk_curr_seq,chunk_len_arr[*chunk_curr_seq]);
HDfprintf(stderr,"%s: chunk_offset_arr[%Zu]=%Hu\n",FUNC,*chunk_curr_seq,chunk_offset_arr[*chunk_curr_seq]);
HDfprintf(stderr,"%s: mem_len_arr[%Zu]=%Zu\n",FUNC,*mem_curr_seq,mem_len_arr[*mem_curr_seq]);
HDfprintf(stderr,"%s: mem_offset_arr[%Zu]=%Hu\n",FUNC,*mem_curr_seq,mem_offset_arr[*mem_curr_seq]);
#endif /* QAK */

    /*
     * If the chunk is too large to load into the cache and it has no
     * filters in the pipeline (i.e. not compressed) and if the address
     * for the chunk has been defined, then don't load the chunk into the
     * cache, just write the data to it directly.
     *
     * If MPI based VFD is used, must bypass the
     * chunk-cache scheme because other MPI processes could be
     * writing to other elements in the same chunk.  Do a direct
     * write-through of only the elements requested.
     */
#ifdef H5_HAVE_PARALLEL
    /* Additional sanity checks when operating in parallel */
    if(IS_H5FD_MPI(dset->ent.file)) {
        if (chunk_addr==HADDR_UNDEF)
            HGOTO_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "unable to locate raw data chunk")
        if (dset->shared->dcpl_cache.pline.nused>0)
            HGOTO_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "cannot write to chunked storage with filters in parallel")
    } /* end if */
#endif /* H5_HAVE_PARALLEL */

    if (dset->shared->dcpl_cache.pline.nused==0 && ((dset->shared->layout.u.chunk.size>dset->shared->cache.chunk.nbytes_max && chunk_addr!=HADDR_UNDEF)
            || (IS_H5FD_MPI(dset->ent.file) && (H5F_ACC_RDWR & H5F_get_intent(dset->ent.file))))) {
        H5D_io_info_t chk_io_info;      /* Temporary I/O info object */
        H5D_storage_t chk_store;        /* Chunk storage information */

        /* Set up the storage information for the chunk */
        chk_store.contig.dset_addr=chunk_addr;
        chk_store.contig.dset_size=(hsize_t)dset->shared->layout.u.chunk.size;

        /* Set up new dataset I/O info */
        H5D_BUILD_IO_INFO(&chk_io_info,dset,io_info->dxpl_cache,io_info->dxpl_id,&chk_store);

        /* Do I/O directly on chunk without reading it into the cache */
        if ((ret_value=H5D_contig_writevv(&chk_io_info, chunk_max_nseq, chunk_curr_seq, chunk_len_arr, chunk_offset_arr, mem_max_nseq, mem_curr_seq, mem_len_arr, mem_offset_arr, buf))<0)
            HGOTO_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "unable to write raw data to file")
    } /* end if */
    else {
        uint8_t         *chunk;         /* Pointer to cached chunk in memory */
        unsigned        idx_hint=0;     /* Cache index hint      */
        ssize_t         naccessed;      /* Number of bytes accessed in chunk */
        size_t          total_bytes;    /* Total # of bytes accessed on disk & memory */
        hbool_t         relax;          /* Whether whole chunk is selected */

        /*
         * Lock the chunk, copy from application to chunk, then unlock the
         * chunk.
         */
#ifdef OLD_WAY
/* Note that this is technically OK, since eventually all the data in the chunk
 * will be overwritten.  However, it seems risky and a better approach would
 * be to lock the chunk in the dataset I/O routine (setting the relax flag
 * appropriately) and then unlock it after all the I/O the chunk was finished. -QAK
 */
        if(chunk_max_nseq==1 && chunk_len_arr[0] == dset->shared->layout.u.chunk.size)
            relax = TRUE;
        else
            relax = FALSE;
#else /* OLD_WAY */
        relax=TRUE;
        total_bytes=0;
        for(u=*chunk_curr_seq; u<chunk_max_nseq; u++)
            total_bytes+=chunk_len_arr[u];
        if(total_bytes!=dset->shared->layout.u.chunk.size)
            relax=FALSE;
        if(relax) {
            total_bytes=0;
            for(u=*mem_curr_seq; u<mem_max_nseq; u++)
                total_bytes+=mem_len_arr[u];
            if(total_bytes!=dset->shared->layout.u.chunk.size)
                relax=FALSE;
        } /* end if */
#endif /* OLD_WAY */

        if (NULL==(chunk=H5D_istore_lock(io_info, &udata, relax, &idx_hint)))
            HGOTO_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "unable to read raw data chunk")

        /* Use the vectorized memory copy routine to do actual work */
        if((naccessed=H5V_memcpyvv(chunk,chunk_max_nseq,chunk_curr_seq,chunk_len_arr,chunk_offset_arr,buf,mem_max_nseq,mem_curr_seq,mem_len_arr,mem_offset_arr))<0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "vectorized memcpy failed")

        H5_CHECK_OVERFLOW(naccessed,ssize_t,size_t);
        if (H5D_istore_unlock(io_info, TRUE, idx_hint, chunk, (size_t)naccessed)<0)
            HGOTO_ERROR (H5E_IO, H5E_WRITEERROR, FAIL, "uanble to unlock raw data chunk")

        /* Set return value */
        ret_value=naccessed;
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D_istore_writevv() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_create
 *
 * Purpose:	Creates a new indexed-storage B-tree and initializes the
 *		istore struct with information about the storage.  The
 *		struct should be immediately written to the object header.
 *
 *		This function must be called before passing ISTORE to any of
 *		the other indexed storage functions!
 *
 * Return:	Non-negative on success (with the ISTORE argument initialized
 *		and ready to write to an object header). Negative on failure.
 *
 * Programmer:	Robb Matzke
 *		Tuesday, October 21, 1997
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_create(H5F_t *f, hid_t dxpl_id, H5O_layout_t *layout /*out */)
{
    H5D_istore_ud0_t	udata;
#ifndef NDEBUG
    unsigned			u;
#endif
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_create, FAIL)

    /* Check args */
    HDassert(f);
    HDassert(layout && H5D_CHUNKED == layout->type);
    HDassert(layout->u.chunk.ndims > 0 && layout->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
#ifndef NDEBUG
    for(u = 0; u < layout->u.chunk.ndims; u++)
	HDassert(layout->u.chunk.dim[u] > 0);
#endif

    /* Initialize "user" data for B-tree callbacks, etc. */
    udata.mesg = layout;

    if(H5B_create(f, dxpl_id, H5B_ISTORE, &udata, &(layout->u.chunk.addr)/*out*/) < 0)
	HGOTO_ERROR(H5E_IO, H5E_CANTINIT, FAIL, "can't create B-tree")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_create() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_allocated
 *
 * Purpose:	Return the number of bytes allocated in the file for storage
 *		of raw data under the specified B-tree (ADDR is the address
 *		of the B-tree).
 *
 * Return:	Success:	Number of bytes stored in all chunks.
 *
 *		Failure:	0
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 21, 1999
 *
 *-------------------------------------------------------------------------
 */
hsize_t
H5D_istore_allocated(H5D_t *dset, hid_t dxpl_id)
{
    H5D_io_info_t io_info;              /* Temporary I/O info object */
    const H5D_rdcc_t   *rdcc = &(dset->shared->cache.chunk);	/*raw data chunk cache */
    H5D_rdcc_ent_t     *ent;    /*cache entry  */
    H5D_dxpl_cache_t _dxpl_cache;       /* Data transfer property cache buffer */
    H5D_dxpl_cache_t *dxpl_cache=&_dxpl_cache;   /* Data transfer property cache */
    H5D_istore_it_ud1_t	udata;
    hsize_t      ret_value;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_allocated, 0)

    HDassert(dset);

    /* Fill the DXPL cache values for later use */
    if (H5D_get_dxpl_cache(dxpl_id,&dxpl_cache)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, 0, "can't fill dxpl cache")

    /* Construct dataset I/O info */
    H5D_BUILD_IO_INFO(&io_info,dset,dxpl_cache,dxpl_id,NULL);

    /* Search for cached chunks that haven't been written out */
    for(ent = rdcc->head; ent; ent = ent->next) {
        /* Flush the chunk out to disk, to make certain the size is correct later */
        if (H5D_istore_flush_entry(&io_info, ent, FALSE)<0)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, 0, "cannot flush indexed storage buffer")
    } /* end for */

    HDmemset(&udata, 0, sizeof udata);
    udata.common.mesg = &dset->shared->layout;
    if (H5B_iterate(dset->ent.file, dxpl_id, H5B_ISTORE, H5D_istore_iter_allocated, dset->shared->layout.u.chunk.addr, &udata)<0)
        HGOTO_ERROR(H5E_IO, H5E_CANTINIT, 0, "unable to iterate over chunk B-tree")

    /* Set return value */
    ret_value = udata.total_storage;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_allocated() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_get_addr
 *
 * Purpose:	Get the file address of a chunk if file space has been
 *		assigned.  Save the retrieved information in the udata
 *		supplied.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Albert Cheng
 *              June 27, 1998
 *
 *-------------------------------------------------------------------------
 */
haddr_t
H5D_istore_get_addr(const H5D_io_info_t *io_info, H5D_istore_ud1_t *_udata)
{
    H5D_istore_ud1_t	tmp_udata;      /* Information about a chunk */
    H5D_istore_ud1_t	*udata;         /* Pointer to information about a chunk */
    unsigned	u;
    haddr_t	ret_value;		/* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_get_addr)

    HDassert(io_info);
    HDassert(io_info->dset);
    HDassert(io_info->dset->shared->layout.u.chunk.ndims > 0);
    HDassert(io_info->store->chunk.offset);

    /* Check for udata struct to return */
    udata = (_udata != NULL ? _udata : &tmp_udata);

    /* Initialize the information about the chunk we are looking for */
    for(u = 0; u < io_info->dset->shared->layout.u.chunk.ndims; u++)
	udata->common.key.offset[u] = io_info->store->chunk.offset[u];
    udata->common.mesg = &(io_info->dset->shared->layout);
    udata->addr = HADDR_UNDEF;

    /* Go get the chunk information */
    if (H5B_find (io_info->dset->ent.file, io_info->dxpl_id, H5B_ISTORE, io_info->dset->shared->layout.u.chunk.addr, udata)<0) {
        /* Note: don't push error on stack, leave that to next higher level,
         *      since many times the B-tree is searched in order to determine
         *      if a chunk exists in the B-tree or not. -QAK
         */
#ifdef OLD_WAY
        H5E_clear();

	HGOTO_ERROR(H5E_BTREE,H5E_NOTFOUND,HADDR_UNDEF,"Can't locate chunk info")
#else /* OLD_WAY */
	HGOTO_DONE(HADDR_UNDEF)
#endif /* OLD_WAY */
    } /* end if */

    /* Success!  Set the return value */
    ret_value=udata->addr;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D_istore_get_addr() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_chunk_alloc
 *
 * Purpose:	Allocate space for a chunk in memory.  This routine allocates
 *              memory space for non-filtered chunks from a block free list
 *              and uses malloc()/free() for filtered chunks.
 *
 * Return:	Pointer to memory for chunk on success/NULL on failure
 *
 * Programmer:	Quincey Koziol
 *              April 22, 2004
 *
 *-------------------------------------------------------------------------
 */
static void *
H5D_istore_chunk_alloc(size_t size, const H5O_pline_t *pline)
{
    void *ret_value=NULL;		/* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_chunk_alloc)

    assert(size);
    assert(pline);

    if(pline->nused>0)
        ret_value=H5MM_malloc(size);
    else
        ret_value=H5FL_BLK_MALLOC(chunk,size);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5D_istore_chunk_alloc() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_chunk_xfree
 *
 * Purpose:	Free space for a chunk in memory.  This routine allocates
 *              memory space for non-filtered chunks from a block free list
 *              and uses malloc()/free() for filtered chunks.
 *
 * Return:	NULL (never fails)
 *
 * Programmer:	Quincey Koziol
 *              April 22, 2004
 *
 *-------------------------------------------------------------------------
 */
static void *
H5D_istore_chunk_xfree(void *chk, const H5O_pline_t *pline)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5D_istore_chunk_xfree)

    assert(pline);

    if(chk) {
        if(pline->nused>0)
            H5MM_xfree(chk);
        else
            H5FL_BLK_FREE(chunk,chk);
    } /* end if */

    FUNC_LEAVE_NOAPI(NULL)
} /* H5D_istore_chunk_xfree() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_allocate
 *
 * Purpose:	Allocate file space for all chunks that are not allocated yet.
 *		Return SUCCEED if all needed allocation succeed, otherwise
 *		FAIL.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Note:	Current implementation relies on cache_size being 0,
 *		thus no chunk is cashed and written to disk immediately
 *		when a chunk is unlocked (via H5F_istore_unlock)
 *		This should be changed to do a direct flush independent
 *		of the cache value.
 *
 *              This routine might be called before the dcpl_cache is set up
 *              correctly, so don't use those values.
 *
 * Programmer:	Albert Cheng
 *		June 26, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_allocate(H5D_t *dset, hid_t dxpl_id, hbool_t full_overwrite)
{
    H5D_io_info_t io_info;      /* Dataset I/O info */
    H5D_storage_t store;        /* Dataset storage information */
    hsize_t	chunk_offset[H5O_LAYOUT_NDIMS]; /* Offset of current chunk */
    size_t      elmts_per_chunk; /* # of elements which fit in a chunk */
    size_t	orig_chunk_size; /* Original size of chunk in bytes */
    unsigned    filter_mask = 0;    /* Filter mask for chunks that have them */
    H5D_fill_value_t fill_status;    /* The fill value status */
    hbool_t     should_fill = FALSE;   /* Whether fill values should be written */
    void        *chunk = NULL;  /* Chunk buffer for writing fill values */
    H5D_dxpl_cache_t _dxpl_cache;       /* Data transfer property cache buffer */
    H5D_dxpl_cache_t *dxpl_cache = &_dxpl_cache;   /* Data transfer property cache */
#ifdef H5_HAVE_PARALLEL
    MPI_Comm	mpi_comm = MPI_COMM_NULL;	/* MPI communicator for file */
    int         mpi_rank = (-1);  /* This process's rank  */
    int         mpi_code;       /* MPI return code */
    hbool_t     blocks_written = FALSE; /* Flag to indicate that chunk was actually written */
    hbool_t     using_mpi = FALSE;      /* Flag to indicate that the file is being accessed with an MPI-capable file driver */
#endif /* H5_HAVE_PARALLEL */
    hbool_t	carry;          /* Flag to indicate that chunk increment carrys to higher dimension (sorta) */
    int         space_ndims;    /* Dataset's space rank */
    hsize_t     space_dim[H5O_LAYOUT_NDIMS];    /* Dataset's dataspace dimensions */
    H5T_path_t *fill_to_mem_tpath;      /* Datatype conversion path for converting the fill value to the memory buffer */
    H5T_path_t *mem_to_dset_tpath;      /* Datatype conversion path for converting the memory buffer to the dataset elements */
    uint8_t    *bkg_buf = NULL;         /* Background conversion buffer */
    H5T_t      *mem_type = NULL;        /* Pointer to memory datatype */
    size_t      mem_type_size, file_type_size;       /* Size of datatype in memory and on disk */
    size_t      elmt_size;              /* Size of each element */
    hid_t       mem_tid = (-1);         /* Memory version of disk datatype */
    size_t      bkg_buf_size;           /* Size of background buffer */
    hbool_t     has_vlen_fill_type = FALSE;  /* Whether the datatype for the fill value has a variable-length component */
    herr_t	ret_value = SUCCEED;	/* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_allocate, FAIL)

    /* Check args */
    HDassert(dset && H5D_CHUNKED == dset->shared->layout.type);
    HDassert(dset->shared->layout.u.chunk.ndims > 0 && dset->shared->layout.u.chunk.ndims <= H5O_LAYOUT_NDIMS);
    HDassert(H5F_addr_defined(dset->shared->layout.u.chunk.addr));
    HDassert(TRUE == H5P_isa_class(dxpl_id, H5P_DATASET_XFER));

    /* Retrieve the dataset dimensions */
    if((space_ndims = H5S_get_simple_extent_dims(dset->shared->space, space_dim, NULL)) < 0)
         HGOTO_ERROR(H5E_DATASET, H5E_CANTINIT, FAIL, "unable to get simple dataspace info")
    space_dim[space_ndims] = dset->shared->layout.u.chunk.dim[space_ndims];

    /* Fill the DXPL cache values for later use */
    if(H5D_get_dxpl_cache(dxpl_id, &dxpl_cache) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't fill dxpl cache")

#ifdef H5_HAVE_PARALLEL
    /* Retrieve MPI parameters */
    if(IS_H5FD_MPI(dset->ent.file)) {
        /* Get the MPI communicator */
        if(MPI_COMM_NULL == (mpi_comm = H5F_mpi_get_comm(dset->ent.file)))
            HGOTO_ERROR(H5E_INTERNAL, H5E_MPI, FAIL, "Can't retrieve MPI communicator")

        /* Get the MPI rank */
        if((mpi_rank = H5F_mpi_get_rank(dset->ent.file)) < 0)
            HGOTO_ERROR(H5E_INTERNAL, H5E_MPI, FAIL, "Can't retrieve MPI rank")

        /* Set the MPI-capable file driver flag */
        using_mpi = TRUE;
    } /* end if */
#endif  /* H5_HAVE_PARALLEL */

    /* Get original chunk size */
    H5_CHECK_OVERFLOW(dset->shared->layout.u.chunk.size, hsize_t, size_t);
    orig_chunk_size = (size_t)dset->shared->layout.u.chunk.size;

    /* Check the dataset's fill-value status */
    if(H5P_is_fill_value_defined(&dset->shared->dcpl_cache.fill, &fill_status) < 0)
        HGOTO_ERROR(H5E_PLIST, H5E_CANTGET, FAIL, "can't tell if fill value defined")

    /* If we are filling the dataset on allocation or "if set" and
     * the fill value _is_ set, _and_ we are not overwriting the new blocks,
     * or if there are any pipeline filters defined,
     * set the "should fill" flag
     */
    if((!full_overwrite && (dset->shared->dcpl_cache.fill_time == H5D_FILL_TIME_ALLOC ||
            (dset->shared->dcpl_cache.fill_time == H5D_FILL_TIME_IFSET && fill_status == H5D_FILL_VALUE_USER_DEFINED)))
            || dset->shared->dcpl_cache.pline.nused > 0)
        should_fill = TRUE;

    /* Check if fill values should be written to chunks */
    if(should_fill) {
        /* Fill the chunk with the proper values */
        if(dset->shared->dcpl_cache.fill.buf) {
            /* Detect whether the datatype has a VL component */
            has_vlen_fill_type = H5T_detect_class(dset->shared->type, H5T_VLEN);

            /* If necessary, convert fill value datatypes (which copies VL components, etc.) */
            if(has_vlen_fill_type) {
                /* Create temporary datatype for conversion operation */
                if(NULL == (mem_type = H5T_copy(dset->shared->type, H5T_COPY_REOPEN)))
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTCOPY, FAIL, "unable to copy file datatype")
                if((mem_tid = H5I_register(H5I_DATATYPE, mem_type)) < 0)
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTREGISTER, FAIL, "unable to register memory datatype")

                /* Retrieve sizes of memory & file datatypes */
                mem_type_size = H5T_get_size(mem_type);
                HDassert(mem_type_size > 0);
                file_type_size = H5T_get_size(dset->shared->type);
                HDassert(file_type_size == dset->shared->dcpl_cache.fill.size);

                /* Compute the base size for a chunk to operate on */
                elmt_size = MAX(mem_type_size, file_type_size);
                elmts_per_chunk = dset->shared->layout.u.chunk.size / file_type_size;
                orig_chunk_size = elmts_per_chunk * elmt_size;

                /* Allocate a chunk buffer now, if _no_ filters are used */
                if(dset->shared->dcpl_cache.pline.nused == 0)
                    if(NULL == (chunk = H5D_istore_chunk_alloc(orig_chunk_size, &dset->shared->dcpl_cache.pline)))
                        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for chunk")

                /* Get the datatype conversion path for this operation */
                if(NULL == (fill_to_mem_tpath = H5T_path_find(dset->shared->type, mem_type, NULL, NULL, dxpl_id)))
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert between src and dst datatypes")

                /* Get the inverse datatype conversion path for this operation */
                if(NULL == (mem_to_dset_tpath = H5T_path_find(mem_type, dset->shared->type, NULL, NULL, dxpl_id)))
                    HGOTO_ERROR(H5E_DATATYPE, H5E_CANTINIT, FAIL, "unable to convert between src and dst datatypes")

                /* Check if we need to allocate a background buffer */
                if(H5T_path_bkg(fill_to_mem_tpath) || H5T_path_bkg(mem_to_dset_tpath)) {
                    /* Check for inverse datatype conversion needing a background buffer */
                    /* (do this first, since it needs a larger buffer) */
                    if(H5T_path_bkg(mem_to_dset_tpath))
                        bkg_buf_size = elmts_per_chunk * elmt_size;
                    else
                        bkg_buf_size = elmt_size;

                    /* Allocate the background buffer */
                    if(NULL == (bkg_buf = H5FL_BLK_MALLOC(type_conv, bkg_buf_size)))
                        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed")
                } /* end if */
            } /* end if */
            else {
                /* Allocate chunk buffer for processes to use when writing fill values */
                if(NULL == (chunk = H5D_istore_chunk_alloc(orig_chunk_size, &dset->shared->dcpl_cache.pline)))
                    HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for chunk")

                /*
                 * Replicate the fill value throughout the chunk.
                 */
                HDassert(0 == (orig_chunk_size % dset->shared->dcpl_cache.fill.size));
                H5V_array_fill(chunk, dset->shared->dcpl_cache.fill.buf, dset->shared->dcpl_cache.fill.size, (size_t)(orig_chunk_size / dset->shared->dcpl_cache.fill.size));
            } /* end else */
        } /* end if */
        else {
            /* Allocate chunk buffer for processes to use when writing fill values */
            if(NULL == (chunk = H5D_istore_chunk_alloc(orig_chunk_size, &dset->shared->dcpl_cache.pline)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for chunk")

            /*
             * No fill value was specified, assume all zeros.
             */
            HDmemset(chunk, 0, orig_chunk_size);
        } /* end else */

        /* Check if there are filters which need to be applied to the chunk */
        /* (only do this in advance when the chunk info can be re-used (i.e.
         *      it doesn't contain any non-default VL datatype fill values)
         */
        if(!has_vlen_fill_type && dset->shared->dcpl_cache.pline.nused > 0) {
            size_t buf_size = orig_chunk_size;

            /* Push the chunk through the filters */
            if(H5Z_pipeline(&dset->shared->dcpl_cache.pline, 0, &filter_mask, dxpl_cache->err_detect, dxpl_cache->filter_cb, &orig_chunk_size, &buf_size, &chunk) < 0)
                HGOTO_ERROR(H5E_PLINE, H5E_WRITEERROR, FAIL, "output pipeline failed")
        } /* end if */
    } /* end if */

    /* Set up dataset I/O info */
    store.chunk.offset = chunk_offset;
    H5D_BUILD_IO_INFO(&io_info, dset, dxpl_cache, dxpl_id, &store);

    /* Reset the chunk offset indices */
    HDmemset(chunk_offset, 0, (dset->shared->layout.u.chunk.ndims * sizeof(chunk_offset[0])));

    /* Loop over all chunks */
    carry = FALSE;
    while(!carry) {
        int i;                  /* Local index variable */

        /* Check if the chunk exists yet on disk */
        if(!H5F_addr_defined(H5D_istore_get_addr(&io_info, NULL))) {
            const H5D_rdcc_t *rdcc = &(dset->shared->cache.chunk);  /* Raw data chunk cache */
            H5D_rdcc_ent_t *ent;    /* Cache entry  */
            hbool_t chunk_exists;   /* Flag to indicate whether a chunk exists already */
            unsigned u;             /* Local index variable */

            /* Didn't find the chunk on disk */
            chunk_exists = FALSE;

            /* Look for chunk in cache */
            for(ent = rdcc->head; ent && !chunk_exists; ent = ent->next) {
                /* Assume a match */
                chunk_exists = TRUE;
                for(u = 0; u < dset->shared->layout.u.chunk.ndims; u++)
                    if(ent->offset[u] != chunk_offset[u]) {
                        chunk_exists = FALSE;       /* Reset if no match */
                        break;
                    } /* end if */
            } /* end for */

            /* Chunk wasn't in cache either, create it now */
            if(!chunk_exists) {
                H5D_istore_ud1_t udata;	/* B-tree pass-through for creating chunk */
                size_t	chunk_size;     /* Size of chunk in bytes, possibly filtered */

                /* Check for VL datatype & non-default fill value */
                if(has_vlen_fill_type) {
                    /* Allocate a new chunk buffer each time, if filters are used */
                    if(dset->shared->dcpl_cache.pline.nused > 0)
                        if(NULL == (chunk = H5D_istore_chunk_alloc(orig_chunk_size, &dset->shared->dcpl_cache.pline)))
                            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for chunk")

                    /* Make a copy of the (disk-based) fill value into the buffer */
                    HDmemcpy(chunk, dset->shared->dcpl_cache.fill.buf, file_type_size);

                    /* Reset first element of background buffer, if necessary */
                    if(H5T_path_bkg(fill_to_mem_tpath))
                        HDmemset(bkg_buf, 0, elmt_size);

                    /* Type convert the dataset buffer, to copy any VL components */
                    if(H5T_convert(fill_to_mem_tpath, dset->shared->type_id, mem_tid, (size_t)1, (size_t)0, (size_t)0, chunk, bkg_buf, dxpl_id) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, FAIL, "data type conversion failed")

                    /* Replicate the fill value into the cached buffer */
                    H5V_array_fill(chunk, chunk, mem_type_size, elmts_per_chunk);

                    /* Reset the entire background buffer, if necessary */
                    if(H5T_path_bkg(mem_to_dset_tpath))
                        HDmemset(bkg_buf, 0, bkg_buf_size);

                    /* Type convert the dataset buffer, to copy any VL components */
                    if(H5T_convert(mem_to_dset_tpath, mem_tid, dset->shared->type_id, elmts_per_chunk, (size_t)0, (size_t)0, chunk, bkg_buf, dxpl_id) < 0)
                        HGOTO_ERROR(H5E_DATASET, H5E_CANTCONVERT, FAIL, "data type conversion failed")

                    /* Check if there are filters which need to be applied to the chunk */
                    if(dset->shared->dcpl_cache.pline.nused > 0) {
                        size_t buf_size = orig_chunk_size;
                        size_t nbytes = (size_t)dset->shared->layout.u.chunk.size;

                        /* Push the chunk through the filters */
                        if(H5Z_pipeline(&dset->shared->dcpl_cache.pline, 0, &filter_mask, dxpl_cache->err_detect, dxpl_cache->filter_cb, &nbytes, &buf_size, &chunk) < 0)
                            HGOTO_ERROR(H5E_PLINE, H5E_WRITEERROR, FAIL, "output pipeline failed")

                        /* Keep the number of bytes the chunk turned in to */
                        chunk_size = nbytes;
                    } /* end if */
                    else
                        chunk_size = (size_t)dset->shared->layout.u.chunk.size;
                } /* end if */
                else
                    chunk_size = orig_chunk_size;

                /* Initialize the chunk information */
                udata.common.mesg = &dset->shared->layout;
                udata.common.key.filter_mask = filter_mask;
                udata.addr = HADDR_UNDEF;
                udata.common.key.nbytes = chunk_size;
                for(u = 0; u < dset->shared->layout.u.chunk.ndims; u++)
                    udata.common.key.offset[u] = chunk_offset[u];

                /* Allocate the chunk with all processes */
                if(H5B_insert(dset->ent.file, dxpl_id, H5B_ISTORE, dset->shared->layout.u.chunk.addr, &udata) < 0)
                    HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to allocate chunk")

                /* Check if fill values should be written to chunks */
                if(should_fill) {
#ifdef H5_HAVE_PARALLEL
                    /* Check if this file is accessed with an MPI-capable file driver */
                    if(using_mpi) {
                        /* Write the chunks out from only one process */
                        /* !! Use the internal "independent" DXPL!! -QAK */
                        if(H5_PAR_META_WRITE == mpi_rank)
                            if(H5F_block_write(dset->ent.file, H5FD_MEM_DRAW, udata.addr, udata.common.key.nbytes, H5AC_ind_dxpl_id, chunk) < 0)
                                HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write raw data to file")

                        /* Indicate that blocks are being written */
                        blocks_written = TRUE;
                    } /* end if */
                    else {
#endif /* H5_HAVE_PARALLEL */
                        if(H5F_block_write(dset->ent.file, H5FD_MEM_DRAW, udata.addr, udata.common.key.nbytes, dxpl_id, chunk) < 0)
                            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to write raw data to file")
#ifdef H5_HAVE_PARALLEL
                    } /* end else */
#endif /* H5_HAVE_PARALLEL */
                } /* end if */

                /* Release the chunk if we need to re-allocate it each time */
                if(has_vlen_fill_type && dset->shared->dcpl_cache.pline.nused > 0)
                    chunk = H5D_istore_chunk_xfree(chunk, &dset->shared->dcpl_cache.pline);
            } /* end if */
        } /* end if */

        /* Increment chunk offset indices */
        carry = TRUE;
        for(i = (int)dset->shared->layout.u.chunk.ndims - 1; i >= 0; --i) {
            chunk_offset[i] += dset->shared->layout.u.chunk.dim[i];
            if(chunk_offset[i] >= space_dim[i])
                chunk_offset[i] = 0;
            else {
                carry = FALSE;
                break;
            } /* end else */
        } /* end for */
    } /* end while */

#ifdef H5_HAVE_PARALLEL
    /* Only need to block at the barrier if we actually initialized a chunk */
    /* using an MPI-capable file driver */
    if(using_mpi && blocks_written) {
        /* Wait at barrier to avoid race conditions where some processes are
         * still writing out chunks and other processes race ahead to read
         * them in, getting bogus data.
         */
        if(MPI_SUCCESS != (mpi_code = MPI_Barrier(mpi_comm)))
            HMPI_GOTO_ERROR(FAIL, "MPI_Barrier failed", mpi_code);
    } /* end if */
#endif /* H5_HAVE_PARALLEL */

done:
    /* Free the chunk for fill values */
    if(chunk)
        chunk = H5D_istore_chunk_xfree(chunk, &dset->shared->dcpl_cache.pline);

    /* Free other resources for vlen fill values */
    if(has_vlen_fill_type) {
        if(mem_tid > 0)
            H5I_dec_ref(mem_tid);
        else if(mem_type)
            H5T_close(mem_type);
        if(bkg_buf)
            H5FL_BLK_FREE(type_conv, bkg_buf);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_allocate() */


/*-------------------------------------------------------------------------
 * Function: H5D_istore_prune_by_extent
 *
 * Purpose: This function searches for chunks that are no longer necessary both in the
 *  raw data cache and in the B-tree.
 *
 * Return: Success: 0, Failure: -1
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 * Algorithm: Robb Matzke
 *
 * Date: March 27, 2002
 *
 * The algorithm is:
 *
 *  For chunks that are no longer necessary:
 *
 *  1. Search in the raw data cache for each chunk
 *  2. If found then preempt it from the cache
 *  3. Search in the B-tree for each chunk
 *  4. If found then remove it from the B-tree and deallocate file storage for the chunk
 *
 * This example shows a 2d dataset of 90x90 with a chunk size of 20x20.
 *
 *
 *     0         20        40        60        80    90   100
 *    0 +---------+---------+---------+---------+-----+...+
 *      |:::::X::::::::::::::         :         :     |   :
 *      |:::::::X::::::::::::         :         :     |   :   Key
 *      |::::::::::X:::::::::         :         :     |   :   --------
 *      |::::::::::::X:::::::         :         :     |   :  +-+ Dataset
 *    20+::::::::::::::::::::.........:.........:.....+...:  | | Extent
 *      |         :::::X:::::         :         :     |   :  +-+
 *      |         :::::::::::         :         :     |   :
 *      |         :::::::::::         :         :     |   :  ... Chunk
 *      |         :::::::X:::         :         :     |   :  : : Boundary
 *    40+.........:::::::::::.........:.........:.....+...:  :.:
 *      |         :         :         :         :     |   :
 *      |         :         :         :         :     |   :  ... Allocated
 *      |         :         :         :         :     |   :  ::: & Filled
 *      |         :         :         :         :     |   :  ::: Chunk
 *    60+.........:.........:.........:.........:.....+...:
 *      |         :         :::::::X:::         :     |   :   X  Element
 *      |         :         :::::::::::         :     |   :      Written
 *      |         :         :::::::::::         :     |   :
 *      |         :         :::::::::::         :     |   :
 *    80+.........:.........:::::::::::.........:.....+...:   O  Fill Val
 *      |         :         :         :::::::::::     |   :      Explicitly
 *      |         :         :         ::::::X::::     |   :      Written
 *    90+---------+---------+---------+---------+-----+   :
 *      :         :         :         :::::::::::         :
 *   100:.........:.........:.........:::::::::::.........:
 *
 *
 * We have 25 total chunks for this dataset, 5 of which have space
 * allocated in the file because they were written to one or more
 * elements. These five chunks (and only these five) also have entries in
 * the storage B-tree for this dataset.
 *
 * Now lets say we want to shrink the dataset down to 70x70:
 *
 *
 *      0         20        40        60   70   80    90   100
 *    0 +---------+---------+---------+----+----+-----+...+
 *      |:::::X::::::::::::::         :    |    :     |   :
 *      |:::::::X::::::::::::         :    |    :     |   :    Key
 *      |::::::::::X:::::::::         :    |    :     |   :    --------
 *      |::::::::::::X:::::::         :    |    :     |   :   +-+ Dataset
 *    20+::::::::::::::::::::.........:....+....:.....|...:   | | Extent
 *      |         :::::X:::::         :    |    :     |   :   +-+
 *      |         :::::::::::         :    |    :     |   :
 *      |         :::::::::::         :    |    :     |   :   ... Chunk
 *      |         :::::::X:::         :    |    :     |   :   : : Boundary
 *    40+.........:::::::::::.........:....+....:.....|...:   :.:
 *      |         :         :         :    |    :     |   :
 *      |         :         :         :    |    :     |   :   ... Allocated
 *      |         :         :         :    |    :     |   :   ::: & Filled
 *      |         :         :         :    |    :     |   :   ::: Chunk
 *    60+.........:.........:.........:....+....:.....|...:
 *      |         :         :::::::X:::    |    :     |   :    X  Element
 *      |         :         :::::::::::    |    :     |   :       Written
 *      +---------+---------+---------+----+    :     |   :
 *      |         :         :::::::::::         :     |   :
 *    80+.........:.........:::::::::X:.........:.....|...:    O  Fill Val
 *      |         :         :         :::::::::::     |   :       Explicitly
 *      |         :         :         ::::::X::::     |   :       Written
 *    90+---------+---------+---------+---------+-----+   :
 *      :         :         :         :::::::::::         :
 *   100:.........:.........:.........:::::::::::.........:
 *
 *
 * That means that the nine chunks along the bottom and right side should
 * no longer exist. Of those nine chunks, (0,80), (20,80), (40,80),
 * (60,80), (80,80), (80,60), (80,40), (80,20), and (80,0), one is actually allocated
 * that needs to be released.
 * To release the chunks, we traverse the B-tree to obtain a list of unused
 * allocated chunks, and then call H5B_remove() for each chunk.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_prune_by_extent(const H5D_io_info_t *io_info)
{
    H5D_t *dset = io_info->dset;          /* Local pointer to the dataset info */
    const H5D_rdcc_t       *rdcc = &(dset->shared->cache.chunk);	/*raw data chunk cache */
    H5D_rdcc_ent_t         *ent = NULL, *next = NULL;	/*cache entry  */
    unsigned                u;	/*counters  */
    int                     found;	/*remove this entry  */
    H5D_istore_it_ud3_t     udata;	/*B-tree pass-through */
    hsize_t                 curr_dims[H5O_LAYOUT_NDIMS];	/*current dataspace dimensions */
    herr_t      ret_value = SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_prune_by_extent, FAIL)

    /* Check args */
    assert(io_info);
    assert(dset && H5D_CHUNKED == dset->shared->layout.type);
    assert(dset->shared->layout.u.chunk.ndims > 0 && dset->shared->layout.u.chunk.ndims <= H5O_LAYOUT_NDIMS);
    assert(H5F_addr_defined(dset->shared->layout.u.chunk.addr));

    /* Go get the rank & dimensions */
    if(H5S_get_simple_extent_dims(dset->shared->space, curr_dims, NULL) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get dataset dimensions")

 /*-------------------------------------------------------------------------
  * Figure out what chunks are no longer in use for the specified extent
  * and release them from the linked list raw data cache
  *-------------------------------------------------------------------------
  */
    found = 0;
    for(ent = rdcc->head; ent; ent = next) {
	next = ent->next;

        for(u = 0; u < dset->shared->layout.u.chunk.ndims - 1; u++) {
            if((hsize_t)ent->offset[u] >= curr_dims[u]) {
                found = 1;
                break;
            } /* end if */
        } /* end for */

	if(found) {
#ifdef H5D_ISTORE_DEBUG
	    HDfputs("cache:remove:[", stderr);
	    for(u = 0; u < dset->shared->layout.u.chunk.ndims - 1; u++)
		HDfprintf(stderr, "%s%Hd", u ? ", " : "", ent->offset[u]);
	    HDfputs("]\n", stderr);
#endif

	    /* Preempt the entry from the cache, but do not flush it to disk */
	    if(H5D_istore_preempt(io_info, ent, FALSE) < 0)
		HGOTO_ERROR(H5E_IO, H5E_CANTINIT, 0, "unable to preempt chunk")

            found=0;
	}
    }

/*-------------------------------------------------------------------------
 * Check if there are any chunks on the B-tree
 *-------------------------------------------------------------------------
 */

    HDmemset(&udata, 0, sizeof udata);
    udata.common.mesg = &dset->shared->layout;
    udata.dims = curr_dims;

    if(H5B_iterate(dset->ent.file, io_info->dxpl_id, H5B_ISTORE, H5D_istore_prune_extent, dset->shared->layout.u.chunk.addr, &udata) < 0)
	HGOTO_ERROR(H5E_IO, H5E_CANTINIT, 0, "unable to iterate over B-tree")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_prune_by_extent() */


/*-------------------------------------------------------------------------
 * Function: H5D_istore_prune_extent
 *
 * Purpose: Search for chunks that are no longer necessary in the B-tree.
 *
 * Return: Success: 0, Failure: -1
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 *
 * Date: March 26, 2002
 *
 * Comments: Called by H5D_prune_by_extent
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static int
H5D_istore_prune_extent(H5F_t *f, hid_t dxpl_id, const void *_lt_key, haddr_t UNUSED addr,
        const void UNUSED *_rt_key, void *_udata)
{
    H5D_istore_it_ud3_t       *udata = (H5D_istore_it_ud3_t *)_udata;
    const H5D_istore_key_t       *lt_key = (const H5D_istore_key_t *)_lt_key;
    unsigned                u;
    int                     ret_value = H5B_ITER_CONT;       /* Return value */

    /* The LT_KEY is the left key (the one that describes the chunk). It points to a chunk of
     * storage that contains the beginning of the logical address space represented by UDATA.
     */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_prune_extent)

    /* Figure out what chunks are no longer in use for the specified extent and release them */
    for(u = 0; u < udata->common.mesg->u.chunk.ndims - 1; u++)
	if((hsize_t)lt_key->offset[u] >= udata->dims[u]) {
            H5D_istore_ud0_t        bt_udata;

            HDmemset(&bt_udata, 0, sizeof bt_udata);
            bt_udata.key = *lt_key;
            bt_udata.mesg = udata->common.mesg;

            /* Remove */
            if(H5B_remove(f, dxpl_id, H5B_ISTORE, udata->common.mesg->u.chunk.addr, &bt_udata) < 0)
                HGOTO_ERROR(H5E_SYM, H5E_CANTINIT, H5B_ITER_ERROR, "unable to remove entry")
	    break;
	} /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_prune_extent() */


/*-------------------------------------------------------------------------
 * Function: H5D_istore_remove
 *
 * Purpose: Removes chunks that are no longer necessary in the B-tree.
 *
 * Return: Success: 0, Failure: -1
 *
 * Programmer: Robb Matzke
 *             Pedro Vicente, pvn@ncsa.uiuc.edu
 *
 * Date: March 28, 2002
 *
 * Comments: Part of H5B_ISTORE
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static H5B_ins_t
H5D_istore_remove(H5F_t *f, hid_t dxpl_id, haddr_t addr, void *_lt_key /*in,out */ ,
	hbool_t *lt_key_changed /*out */ ,
	void UNUSED * _udata /*in,out */ ,
	void UNUSED * _rt_key /*in,out */ ,
	hbool_t *rt_key_changed /*out */ )
{
    H5D_istore_key_t    *lt_key = (H5D_istore_key_t *)_lt_key;
    H5B_ins_t ret_value=H5B_INS_REMOVE; /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5D_istore_remove)

    /* Remove raw data chunk from file */
    if(H5MF_xfree(f, H5FD_MEM_DRAW, dxpl_id, addr, (hsize_t)lt_key->nbytes)<0)
        HGOTO_ERROR(H5E_STORAGE, H5E_CANTFREE, H5B_INS_ERROR, "unable to free chunk")

    /* Mark keys as unchanged */
    *lt_key_changed = FALSE;
    *rt_key_changed = FALSE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_remove() */


/*-------------------------------------------------------------------------
 * Function: H5D_istore_initialize_by_extent
 *
 * Purpose:  This function searches for chunks that have to be initialized with the fill
 *   value both in the raw data cache and in the B-tree.
 *
 * Return: Success: 0, Failure: -1
 *
 * Programmer: Pedro Vicente, pvn@ncsa.uiuc.edu
 *
 * Date: April 4, 2002
 *
 * Comments:
 *
 * (See the example of H5D_istore_prune_by_extent)
 * Next, there are seven chunks where the database extent boundary is
 * within the chunk. We find those seven just like we did with the previous nine.
 * Fot the ones that are allocated we initialize the part that lies outside the boundary
 * with the fill value.
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_initialize_by_extent(H5D_io_info_t *io_info)
{
    const H5O_layout_t *layout=&(io_info->dset->shared->layout); /* Dataset layout */
    uint8_t                *chunk = NULL;	/*the file chunk  */
    unsigned                idx_hint = 0;	/*input value for H5F_istore_lock */
    hsize_t                 chunk_offset[H5O_LAYOUT_NDIMS];	/*logical location of the chunks */
    hsize_t                 idx_cur[H5O_LAYOUT_NDIMS];	/*multi-dimensional counters */
    hsize_t                 idx_max[H5O_LAYOUT_NDIMS];
    hsize_t                 sub_size[H5O_LAYOUT_NDIMS];
    hsize_t                 naccessed;	/*bytes accessed in chunk */
    hsize_t                 end_chunk;	/*chunk position counter */
    hsize_t                start[H5O_LAYOUT_NDIMS];	/*starting location of hyperslab */
    hsize_t                 count[H5O_LAYOUT_NDIMS];	/*element count of hyperslab */
    hsize_t                 size[H5O_LAYOUT_NDIMS];	/*current size of dimensions */
    H5S_t                  *space_chunk = NULL;	/*dataspace for a chunk */
    hsize_t                 chunk_dims[H5O_LAYOUT_NDIMS];	/*current chunk dimensions */
    hsize_t                 curr_dims[H5O_LAYOUT_NDIMS];	/*current dataspace dimensions */
    hsize_t                 chunks[H5O_LAYOUT_NDIMS];	        /*current number of chunks in each dimension */
    hsize_t                 down_chunks[H5O_LAYOUT_NDIMS];   /* "down" size of number of elements in each dimension */
    int                     srank;	/*current # of dimensions (signed) */
    unsigned                rank;	/*current # of dimensions */
    int                     i, carry;	/*counters  */
    unsigned                u;
    int                     found = 0;	/*initialize this entry  */
    H5P_genplist_t         *dc_plist;   /* Property list */
    H5O_pline_t             pline;      /* I/O pipeline information */
    H5O_fill_t              fill;       /* Fill value information */
    H5D_fill_time_t         fill_time;  /* Fill time information */
    H5D_storage_t           store;      /* Dataset storage information */
    herr_t	            ret_value=SUCCEED;	/* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_initialize_by_extent, FAIL)

    /* Check args */
    assert(io_info);
    assert(io_info->dset && H5D_CHUNKED == layout->type);
    assert(layout->u.chunk.ndims > 0 && layout->u.chunk.ndims <= H5O_LAYOUT_NDIMS);
    assert(H5F_addr_defined(layout->u.chunk.addr));

    /* Get dataset's creation property list */
    if (NULL == (dc_plist = H5I_object(io_info->dset->shared->dcpl_id)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a dataset creation property list")

    /* Get necessary properties from property list */
    if(H5P_get(dc_plist, H5D_CRT_FILL_VALUE_NAME, &fill) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get fill value")
    if(H5P_get(dc_plist, H5D_CRT_FILL_TIME_NAME, &fill_time) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get fill time")
    if(H5P_get(dc_plist, H5D_CRT_DATA_PIPELINE_NAME, &pline) < 0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get data pipeline")

    /* Reset start & count arrays */
    HDmemset(start, 0, sizeof(start));
    HDmemset(count, 0, sizeof(count));

    /* Go get the rank & dimensions */
    if((srank = H5S_get_simple_extent_dims(io_info->dset->shared->space, curr_dims, NULL)) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get dataset dimensions");
    H5_ASSIGN_OVERFLOW(rank,srank,int,unsigned);

    /* Copy current dimensions */
    for(u = 0; u < rank; u++) {
	size[u] = curr_dims[u];

        /* Round up to the next integer # of chunks, to accomodate partial chunks */
        chunks[u] = ((curr_dims[u]+layout->u.chunk.dim[u])-1) / layout->u.chunk.dim[u];
    } /* end for */
    size[u] = layout->u.chunk.dim[u];

    /* Get the "down" sizes for each dimension */
    if(H5V_array_down(rank,chunks,down_chunks)<0)
        HGOTO_ERROR (H5E_INTERNAL, H5E_BADVALUE, FAIL, "can't compute 'down' sizes")

    /* Create a data space for a chunk & set the extent */
    for(u = 0; u < rank; u++)
	chunk_dims[u] = layout->u.chunk.dim[u];
    if(NULL == (space_chunk = H5S_create_simple(rank,chunk_dims,NULL)))
	HGOTO_ERROR(H5E_DATASPACE, H5E_CANTCREATE, FAIL, "can't create simple dataspace")

/*
 * Set up multi-dimensional counters (idx_max, and idx_cur) and
 * loop through the chunks copying each chunk from the application to the
 * chunk cache.
 */
    for(u = 0; u < layout->u.chunk.ndims; u++) {
	if (size[u]) idx_max[u] = (size[u] - 1) / layout->u.chunk.dim[u] + 1;
    else idx_max[u] = 0;
	idx_cur[u] = 0;
    } /* end for */

    /* Point to local dataset storage info */
    assert(io_info->store==NULL);       /* Make certain we aren't blowing anything away */
    io_info->store=&store;

    /* Loop over all chunks */
    carry=0;
    while(carry==0) {
	for(u = 0, naccessed = 1; u < layout->u.chunk.ndims; u++) {
	    /* The location and size of the chunk being accessed */
	    chunk_offset[u] = idx_cur[u] * layout->u.chunk.dim[u];
	    sub_size[u] = MIN((idx_cur[u] + 1) * layout->u.chunk.dim[u],
		    size[u]) - chunk_offset[u];
	    naccessed *= sub_size[u];
	} /* end for */

	/*
	 * Figure out what chunks have to be initialized. These are the chunks where the dataspace
	 * extent boundary is within the chunk
	 */
	for(u = 0, found = 0; u < rank; u++) {
	    end_chunk = chunk_offset[u] + layout->u.chunk.dim[u];
	    if(end_chunk > size[u]) {
		found = 1;
		break;
	    }
	} /* end for */

	if(found) {

            /* Calculate the index of this chunk */
            if(H5V_chunk_index(rank,chunk_offset,layout->u.chunk.dim,down_chunks,&store.chunk.index)<0)
                HGOTO_ERROR (H5E_DATASPACE, H5E_BADRANGE, FAIL, "can't get chunk index")

            store.chunk.offset=chunk_offset;
	    if(NULL == (chunk = H5D_istore_lock(io_info, NULL, FALSE, &idx_hint)))
		HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to read raw data chunk")

	    if(H5S_select_all(space_chunk,1) < 0)
		HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to select space")

	    for(u = 0; u < rank; u++)
		count[u] = MIN((idx_cur[u] + 1) * layout->u.chunk.dim[u], size[u] - chunk_offset[u]);

#ifdef H5D_ISTORE_DEBUG
	    HDfputs("cache:initialize:offset:[", stdout);
	    for(u = 0; u < rank; u++)
		HDfprintf(stdout, "%s%Hd", u ? ", " : "", chunk_offset[u]);
	    HDfputs("]", stdout);
	    HDfputs(":count:[", stdout);
	    for(u = 0; u < rank; u++)
		HDfprintf(stdout, "%s%Hd", u ? ", " : "", count[u]);
	    HDfputs("]\n", stdout);
#endif

	    if(H5S_select_hyperslab(space_chunk, H5S_SELECT_NOTB, start, NULL,
			count, NULL) < 0)
		HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to select hyperslab")

	    /* Fill the selection in the memory buffer */
            /* Use the size of the elements in the chunk directly instead of */
            /* relying on the fill.size, which might be set to 0 if there is */
            /* no fill-value defined for the dataset -QAK */
            H5_CHECK_OVERFLOW(size[rank],hsize_t,size_t);
	    if(H5S_select_fill(fill.buf, (size_t)size[rank], space_chunk, chunk) < 0)
		HGOTO_ERROR(H5E_DATASET, H5E_CANTENCODE, FAIL, "filling selection failed")

	    if(H5D_istore_unlock(io_info, TRUE, idx_hint, chunk, (size_t)naccessed) < 0)
		HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "unable to unlock raw data chunk")
	} /*found */

	/* Increment indices */
	for(i = (int)rank, carry = 1; i >= 0 && carry; --i) {
	    if(++idx_cur[i] >= idx_max[i])
		idx_cur[i] = 0;
	    else
		carry = 0;
	} /* end for */
    } /* end while */

done:
    if(space_chunk)
        if(H5S_close(space_chunk)<0)
            HDONE_ERROR(H5E_DATASET, H5E_CLOSEERROR, FAIL, "unable to release dataspace")

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_initialize_by_extent() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_delete
 *
 * Purpose:	Delete raw data storage for entire dataset (i.e. all chunks)
 *
 * Return:	Success:	Non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Thursday, March 20, 2003
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_delete(H5F_t *f, hid_t dxpl_id, const H5O_layout_t *layout)
{
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_delete, FAIL)

    /* Check if the B-tree has been created in the file */
    if(H5F_addr_defined(layout->u.chunk.addr)) {
        H5O_layout_t tmp_layout=*layout;/* Local copy of layout info */
        H5D_istore_ud0_t	udata;  /* User data for B-tree iterator call */

        /* Set up user data for B-tree deletion */
        HDmemset(&udata, 0, sizeof udata);
        udata.mesg = &tmp_layout;

        /* Allocate the shared structure */
        if(H5D_istore_shared_create(f, &tmp_layout)<0)
            HGOTO_ERROR (H5E_RESOURCE, H5E_CANTINIT, FAIL, "can't create wrapper for shared B-tree info")

        /* Delete entire B-tree */
        if(H5B_delete(f, dxpl_id, H5B_ISTORE, tmp_layout.u.chunk.addr, &udata)<0)
            HGOTO_ERROR(H5E_IO, H5E_CANTDELETE, 0, "unable to delete chunk B-tree")

        /* Free the raw B-tree node buffer */
        if(tmp_layout.u.chunk.btree_shared==NULL)
            HGOTO_ERROR (H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
        if(H5RC_DEC(tmp_layout.u.chunk.btree_shared)<0)
            HGOTO_ERROR (H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_delete() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_update_cache
 *
 * Purpose:	Update any cached chunks index values after the dataspace
 *              size has changed
 *
 * Return:	Success:	Non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Saturday, May 29, 2004
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_update_cache(H5D_t *dset, hid_t dxpl_id)
{
    H5D_io_info_t io_info;              /* Temporary I/O info object */
    H5D_rdcc_t         *rdcc = &(dset->shared->cache.chunk);	/*raw data chunk cache */
    H5D_rdcc_ent_t     *ent, *next;	/*cache entry  */
    H5D_rdcc_ent_t     *old_ent;	/* Old cache entry  */
    H5D_dxpl_cache_t _dxpl_cache;       /* Data transfer property cache buffer */
    H5D_dxpl_cache_t *dxpl_cache=&_dxpl_cache;   /* Data transfer property cache */
    unsigned            rank;	/*current # of dimensions */
    hsize_t             curr_dims[H5O_LAYOUT_NDIMS];	/*current dataspace dimensions */
    hsize_t             chunks[H5O_LAYOUT_NDIMS];	        /*current number of chunks in each dimension */
    hsize_t             down_chunks[H5O_LAYOUT_NDIMS];   /* "down" size of number of elements in each dimension */
    hsize_t             idx;    /* Chunk index */
    unsigned	        old_idx;	/* Previous index number	*/
    unsigned            u;	/*counters  */
    herr_t      ret_value=SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_update_cache, FAIL)

    /* Check args */
    assert(dset && H5D_CHUNKED == dset->shared->layout.type);
    assert(dset->shared->layout.u.chunk.ndims > 0 && dset->shared->layout.u.chunk.ndims <= H5O_LAYOUT_NDIMS);

    /* Go get the rank & dimensions */
    rank = dset->shared->layout.u.chunk.ndims-1;
    if(H5S_get_simple_extent_dims(dset->shared->space, curr_dims, NULL) < 0)
	HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't get dataset dimensions")

    /* Round up to the next integer # of chunks, to accomodate partial chunks */
    for(u = 0; u < rank; u++)
        chunks[u] = ((curr_dims[u]+dset->shared->layout.u.chunk.dim[u])-1) / dset->shared->layout.u.chunk.dim[u];

    /* Get the "down" sizes for each dimension */
    if(H5V_array_down(rank,chunks,down_chunks)<0)
        HGOTO_ERROR (H5E_INTERNAL, H5E_BADVALUE, FAIL, "can't compute 'down' sizes")

    /* Fill the DXPL cache values for later use */
    if (H5D_get_dxpl_cache(dxpl_id,&dxpl_cache)<0)
        HGOTO_ERROR(H5E_DATASET, H5E_CANTGET, FAIL, "can't fill dxpl cache")

    /* Construct dataset I/O info */
    H5D_BUILD_IO_INFO(&io_info,dset,dxpl_cache,dxpl_id,NULL);

    /* Recompute the index for each cached chunk that is in a dataset */
    for(ent = rdcc->head; ent; ent = next) {
        next=ent->next;

        /* Calculate the index of this chunk */
        if(H5V_chunk_index(rank,ent->offset,dset->shared->layout.u.chunk.dim,down_chunks,&idx)<0)
            HGOTO_ERROR (H5E_DATASPACE, H5E_BADRANGE, FAIL, "can't get chunk index")

        /* Compute the index for the chunk entry */
        old_idx=ent->idx;   /* Save for later */
        ent->idx=H5D_HASH(dset->shared,idx);

        if(old_idx!=ent->idx) {
            /* Check if there is already a chunk at this chunk's new location */
            old_ent = rdcc->slot[ent->idx];
            if(old_ent!=NULL) {
                assert(old_ent->locked==0);

                /* Check if we are removing the entry we would walk to next */
                if(old_ent==next)
                    next=old_ent->next;

                /* Remove the old entry from the cache */
                if (H5D_istore_preempt(&io_info, old_ent, TRUE )<0)
                    HGOTO_ERROR (H5E_IO, H5E_CANTFLUSH, FAIL, "unable to flush one or more raw data chunks")
            } /* end if */

            /* Insert this chunk into correct location in hash table */
            rdcc->slot[ent->idx]=ent;

            /* Null out previous location */
            rdcc->slot[old_idx]=NULL;
        } /* end if */
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5F_istore_update_cache() */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_dump_btree
 *
 * Purpose:	Prints information about the storage B-tree to the specified
 *		stream.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, April 28, 1999
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_dump_btree(H5F_t *f, hid_t dxpl_id, FILE *stream, unsigned ndims, haddr_t addr)
{
    H5O_layout_t        layout;
    H5D_istore_it_ud2_t	udata;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_dump_btree, FAIL)

    HDmemset(&udata, 0, sizeof udata);
    layout.u.chunk.ndims = ndims;
    udata.common.mesg = &layout;
    udata.stream = stream;
    if(stream)
        HDfprintf(stream, "    Address: %a\n", addr);
    if(H5B_iterate(f, dxpl_id, H5B_ISTORE, H5D_istore_iter_dump, addr, &udata)<0)
        HGOTO_ERROR(H5E_IO, H5E_CANTINIT, 0, "unable to iterate over chunk B-tree")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_dump_btree() */

#ifdef H5D_ISTORE_DEBUG

/*-------------------------------------------------------------------------
 * Function:	H5D_istore_stats
 *
 * Purpose:	Print raw data cache statistics to the debug stream.  If
 *		HEADERS is non-zero then print table column headers,
 *		otherwise assume that the H5AC layer has already printed them.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, May 21, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_stats (H5D_t *dset, hbool_t headers)
{
    H5D_rdcc_t	*rdcc = &(dset->shared->cache.chunk);
    double	miss_rate;
    char	ascii[32];
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_stats, FAIL)

    if (!H5DEBUG(AC))
        HGOTO_DONE(SUCCEED)

    if (headers) {
        fprintf(H5DEBUG(AC), "H5D: raw data cache statistics\n");
        fprintf(H5DEBUG(AC), "   %-18s %8s %8s %8s %8s+%-8s\n",
            "Layer", "Hits", "Misses", "MissRate", "Inits", "Flushes");
        fprintf(H5DEBUG(AC), "   %-18s %8s %8s %8s %8s-%-8s\n",
            "-----", "----", "------", "--------", "-----", "-------");
    }

#ifdef H5AC_DEBUG
    if (H5DEBUG(AC)) headers = TRUE;
#endif

    if (headers) {
        if (rdcc->nhits>0 || rdcc->nmisses>0) {
            miss_rate = 100.0 * rdcc->nmisses /
                    (rdcc->nhits + rdcc->nmisses);
        } else {
            miss_rate = 0.0;
        }
        if (miss_rate > 100) {
            sprintf(ascii, "%7d%%", (int) (miss_rate + 0.5));
        } else {
            sprintf(ascii, "%7.2f%%", miss_rate);
        }

        fprintf(H5DEBUG(AC), "   %-18s %8u %8u %7s %8d+%-9ld\n",
            "raw data chunks", rdcc->nhits, rdcc->nmisses, ascii,
            rdcc->ninits, (long)(rdcc->nflushes)-(long)(rdcc->ninits));
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_stats() */
#endif /* H5D_ISTORE_DEBUG */


/*-------------------------------------------------------------------------
 * Function:	H5D_istore_debug
 *
 * Purpose:	Debugs a B-tree node for indexed raw data storage.
 *
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *              Thursday, April 16, 1998
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5D_istore_debug(H5F_t *f, hid_t dxpl_id, haddr_t addr, FILE * stream, int indent,
		 int fwidth, unsigned ndims)
{
    H5O_layout_t        layout;
    H5D_istore_ud0_t	udata;          /* B-tree user data */
    herr_t      ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI(H5D_istore_debug,FAIL)

    layout.u.chunk.ndims = ndims;

    /* Allocate the shared structure */
    if(H5D_istore_shared_create(f, &layout)<0)
	HGOTO_ERROR (H5E_RESOURCE, H5E_CANTINIT, FAIL, "can't create wrapper for shared B-tree info")

    /* Set up B-tree user data */
    HDmemset(&udata, 0, sizeof udata);
    udata.mesg = &layout;

    (void)H5B_debug(f, dxpl_id, addr, stream, indent, fwidth, H5B_ISTORE, &udata);

    /* Free the raw B-tree node buffer */
    if(layout.u.chunk.btree_shared==NULL)
        HGOTO_ERROR (H5E_IO, H5E_CANTFREE, FAIL, "ref-counted page nil")
    if(H5RC_DEC(layout.u.chunk.btree_shared)<0)
	HGOTO_ERROR (H5E_IO, H5E_CANTFREE, FAIL, "unable to decrement ref-counted page")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5D_istore_debug() */