summaryrefslogtreecommitdiffstats
path: root/src/H5Cimage.c
blob: 51de5c45a5a287b471f4a0cb4efb670713928fa7 (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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * 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 COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF5/releases.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:     H5Cimage.c
 *              July 20, 2015
 *              John Mainzer
 *
 * Purpose:     Functions in this file are specific to the implementation
 *		of the metadata cache image feature.
 *
 *-------------------------------------------------------------------------
 */

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

#include "H5Cmodule.h"          /* This source code file is part of the H5C module */
#define H5F_FRIEND		/*suppress error about including H5Fpkg	  */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#ifdef H5_HAVE_PARALLEL
#define H5AC_FRIEND		/*suppress error about including H5ACpkg  */
#include "H5ACpkg.h"            /* Metadata cache                       */
#endif /* H5_HAVE_PARALLEL */
#include "H5Cpkg.h"		/* Cache				*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fpkg.h"		/* Files				*/
#include "H5FDprivate.h"	/* File drivers				*/
#include "H5FLprivate.h"	/* Free Lists                           */
#include "H5MFprivate.h"	/* File memory management		*/
#include "H5MMprivate.h"	/* Memory management			*/


/****************/
/* Local Macros */
/****************/
#if H5C_DO_MEMORY_SANITY_CHECKS
#define H5C_IMAGE_EXTRA_SPACE 8
#define H5C_IMAGE_SANITY_VALUE "DeadBeef"
#else /* H5C_DO_MEMORY_SANITY_CHECKS */
#define H5C_IMAGE_EXTRA_SPACE 0
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

/* Cache image buffer components, on disk */
#define H5C__MDCI_BLOCK_SIGNATURE	"MDCI"
#define H5C__MDCI_BLOCK_SIGNATURE_LEN	4
#define H5C__MDCI_BLOCK_VERSION_0	0

/* Metadata cache image header flags -- max 8 bits */
#define H5C__MDCI_HEADER_HAVE_RESIZE_STATUS	0x01

/* Metadata cache image entry flags -- max 8 bits */
#define H5C__MDCI_ENTRY_DIRTY_FLAG		0x01
#define H5C__MDCI_ENTRY_IN_LRU_FLAG		0x02
#define H5C__MDCI_ENTRY_IS_FD_PARENT_FLAG	0x04
#define H5C__MDCI_ENTRY_IS_FD_CHILD_FLAG	0x08

/* Limits on flush dependency values, stored in 16-bit values on disk */
#define H5C__MDCI_MAX_FD_CHILDREN		USHRT_MAX
#define H5C__MDCI_MAX_FD_PARENTS		USHRT_MAX

/* Values for image entry magic field */
#define H5C_IMAGE_ENTRY_T_MAGIC		0x005CAC08
#define H5C_IMAGE_ENTRY_T_BAD_MAGIC	0xBeefDead

/* Maximum ring allowed in image */
#define H5C_MAX_RING_IN_IMAGE   H5C_RING_MDFSM


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


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

/* Helper routines */
static size_t H5C__cache_image_block_entry_header_size(const H5F_t *f);
static size_t H5C__cache_image_block_header_size(const H5F_t *f);
static herr_t H5C__decode_cache_image_header(const H5F_t *f,
    H5C_t *cache_ptr, const uint8_t **buf);
#ifndef NDEBUG	/* only used in assertions */
static herr_t H5C__decode_cache_image_entry(const H5F_t *f,
    const H5C_t *cache_ptr, const uint8_t **buf, unsigned entry_num);
#endif /* NDEBUG */ /* only used in assertions */
static herr_t H5C__destroy_pf_entry_child_flush_deps(H5C_t *cache_ptr, 
    H5C_cache_entry_t *pf_entry_ptr, H5C_cache_entry_t **fd_children);
static herr_t H5C__encode_cache_image_header(const H5F_t *f,
    const H5C_t *cache_ptr, uint8_t **buf);
static herr_t H5C__encode_cache_image_entry(H5F_t *f, H5C_t *cache_ptr, 
    uint8_t **buf, unsigned entry_num);
static herr_t H5C__prep_for_file_close__compute_fd_heights(const H5C_t *cache_ptr);
static void H5C__prep_for_file_close__compute_fd_heights_real(
    H5C_cache_entry_t  *entry_ptr, uint32_t fd_height);
static herr_t H5C__prep_for_file_close__setup_image_entries_array(H5C_t *cache_ptr);
static herr_t H5C__prep_for_file_close__scan_entries(const H5F_t *f,
    H5C_t *cache_ptr);
static herr_t H5C__reconstruct_cache_contents(H5F_t *f, H5C_t *cache_ptr);
static H5C_cache_entry_t *H5C__reconstruct_cache_entry(const H5F_t *f,
    H5C_t *cache_ptr, const uint8_t **buf);
static herr_t H5C__write_cache_image_superblock_msg(H5F_t *f, hbool_t create);
static herr_t H5C__read_cache_image(H5F_t * f, H5C_t *cache_ptr);
static herr_t H5C__write_cache_image(H5F_t *f, const H5C_t *cache_ptr);
static herr_t H5C__construct_cache_image_buffer(H5F_t *f, H5C_t *cache_ptr);
static herr_t H5C__free_image_entries_array(H5C_t *cache_ptr);


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

/* Declare a free list to manage H5C_cache_entry_t objects */
H5FL_DEFINE(H5C_cache_entry_t);


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


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


/*-------------------------------------------------------------------------
 *
 * Function:    H5C_cache_image_pending()
 *
 * Purpose:     Tests to see if the load of a metadata cache image 
 *              load is pending (i.e. will be executed on the next 
 *              protect or insert)
 *
 *              Returns TRUE if a cache image load is pending, and FALSE
 *              if not.  Throws an assertion failure on error.
 *
 * Return:      TRUE if a cache image load is pending, and FALSE otherwise.
 *
 * Programmer:  John Mainzer, 6/18/16
 *
 *-------------------------------------------------------------------------
 */
hbool_t
H5C_cache_image_pending(const H5C_t *cache_ptr)
{
    hbool_t             ret_value = TRUE;      /* Return value */

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);

    ret_value = (cache_ptr->load_image && !cache_ptr->image_loaded);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_cache_image_pending() */


/*-------------------------------------------------------------------------
 * Function:    H5C_cache_image_status()
 *
 * Purpose:     Examine the metadata cache associated with the supplied 
 *              instance of H5F_t to determine whether the load of a 
 *              cache image has either been queued or executed, and if 
 *              construction of a cache image has been requested.
 *
 *              This done, it set *load_ci_ptr to TRUE if a cache image
 *              has either been loaded or a load has been requested, and
 *              to FALSE otherwise.
 *
 *              Similarly, set *write_ci_ptr to TRUE if construction of 
 *              a cache image has been requested, and to FALSE otherwise.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *              12/29/16
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_cache_image_status(H5F_t * f, hbool_t *load_ci_ptr, hbool_t *write_ci_ptr)
{
    H5C_t *     cache_ptr;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    cache_ptr = f->shared->cache;
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(load_ci_ptr);
    HDassert(write_ci_ptr);
 
    *load_ci_ptr = cache_ptr->load_image || cache_ptr->image_loaded;
    *write_ci_ptr = cache_ptr->image_ctl.generate_image;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5C_cache_image_status() */


/*-------------------------------------------------------------------------
 * Function:    H5C__construct_cache_image_buffer()
 *
 * Purpose:     Allocate a buffer of size cache_ptr->image_len, and 
 *		load it with an image of the metadata cache image block.
 *
 *		Note that by the time this function is called, the cache
 *		should have removed all entries from its data structures.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *              8/5/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__construct_cache_image_buffer(H5F_t * f, H5C_t *cache_ptr)
{
    uint8_t *	p;                      /* Pointer into image buffer */
    uint32_t    chksum;
    unsigned	u;                      /* Local index variable */
    herr_t 	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(cache_ptr == f->shared->cache);
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->close_warning_received);
    HDassert(cache_ptr->image_ctl.generate_image);
    HDassert(cache_ptr->num_entries_in_image > 0);
    HDassert(cache_ptr->index_len == 0);
    HDassert(cache_ptr->image_data_len > 0);
    HDassert(cache_ptr->image_data_len <= cache_ptr->image_len);

    /* Allocate the buffer in which to construct the cache image block */
    if(NULL == (cache_ptr->image_buffer = H5MM_malloc(cache_ptr->image_len + 1)))
	HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for cache image buffer")

    /* Construct the cache image block header image */
    p = (uint8_t *)cache_ptr->image_buffer;
    if(H5C__encode_cache_image_header(f, cache_ptr, &p) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTENCODE, FAIL, "header image construction failed")
    HDassert((size_t)(p - (uint8_t *)cache_ptr->image_buffer) < cache_ptr->image_data_len);

    /* Construct the cache entry images */
    for(u = 0; u < cache_ptr->num_entries_in_image; u++)
	if(H5C__encode_cache_image_entry(f, cache_ptr, &p, u) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTENCODE, FAIL, "entry image construction failed")
    HDassert((size_t)(p - (uint8_t *)cache_ptr->image_buffer) < cache_ptr->image_data_len);

    /* Construct the adaptive resize status image -- not yet */

    /* Compute the checksum and encode */
    chksum = H5_checksum_metadata(cache_ptr->image_buffer, (size_t)(cache_ptr->image_data_len - H5F_SIZEOF_CHKSUM), 0);
    UINT32ENCODE(p, chksum);
    HDassert((size_t)(p - (uint8_t *)cache_ptr->image_buffer) == cache_ptr->image_data_len);
    HDassert((size_t)(p - (uint8_t *)cache_ptr->image_buffer) <= cache_ptr->image_len);

#ifndef NDEBUG
    /* validate the metadata cache image we just constructed by decoding it
     * and comparing the result with the original data.
     */
    {
        uint32_t        old_chksum;
        const uint8_t *	q;
        H5C_t *	        fake_cache_ptr = NULL;
        unsigned        v;
        herr_t          status;      /* Status from decoding */

	fake_cache_ptr = (H5C_t *)H5MM_malloc(sizeof(H5C_t));
        HDassert(fake_cache_ptr);
        fake_cache_ptr->magic = H5C__H5C_T_MAGIC;

	/* needed for sanity checks */
	fake_cache_ptr->image_len = cache_ptr->image_len;
        q = (const uint8_t *)cache_ptr->image_buffer;
        status = H5C__decode_cache_image_header(f, fake_cache_ptr, &q);
        HDassert(status >= 0);

        HDassert(NULL != p);
        HDassert(fake_cache_ptr->num_entries_in_image == cache_ptr->num_entries_in_image);

	fake_cache_ptr->image_entries = (H5C_image_entry_t *)H5MM_malloc(sizeof(H5C_image_entry_t) *
                (size_t)(fake_cache_ptr->num_entries_in_image + 1));
	HDassert(fake_cache_ptr->image_entries);

        for(u = 0; u < fake_cache_ptr->num_entries_in_image; u++) {
	    (fake_cache_ptr->image_entries)[u].magic = H5C_IMAGE_ENTRY_T_MAGIC;
            (fake_cache_ptr->image_entries)[u].image_ptr = NULL;

	    /* touch up f->shared->cache to satisfy sanity checks... */
            f->shared->cache = fake_cache_ptr;
	    status = H5C__decode_cache_image_entry(f, fake_cache_ptr, &q, u);
	    HDassert(status >= 0);

	    /* ...and then return f->shared->cache to its correct value */
            f->shared->cache = cache_ptr;

	    /* verify expected contents */
	    HDassert((cache_ptr->image_entries)[u].addr == (fake_cache_ptr->image_entries)[u].addr);
	    HDassert((cache_ptr->image_entries)[u].size == (fake_cache_ptr->image_entries)[u].size);
	    HDassert((cache_ptr->image_entries)[u].type_id == (fake_cache_ptr->image_entries)[u].type_id);
	    HDassert((cache_ptr->image_entries)[u].lru_rank == (fake_cache_ptr->image_entries)[u].lru_rank);
	    HDassert((cache_ptr->image_entries)[u].is_dirty == (fake_cache_ptr->image_entries)[u].is_dirty);
	    /* don't check image_fd_height as it is not stored in 
             * the metadata cache image block.
             */
	    HDassert((cache_ptr->image_entries)[u].fd_child_count == (fake_cache_ptr->image_entries)[u].fd_child_count);
	    HDassert((cache_ptr->image_entries)[u].fd_dirty_child_count == (fake_cache_ptr->image_entries)[u].fd_dirty_child_count);
	    HDassert((cache_ptr->image_entries)[u].fd_parent_count == (fake_cache_ptr->image_entries)[u].fd_parent_count);

	    for(v = 0; v < (cache_ptr->image_entries)[u].fd_parent_count; v++)
		HDassert((cache_ptr->image_entries)[u].fd_parent_addrs[v] == (fake_cache_ptr->image_entries)[u].fd_parent_addrs[v]);

	    /* free the fd_parent_addrs array if it exists */
	    if((fake_cache_ptr->image_entries)[u].fd_parent_addrs) {
		HDassert((fake_cache_ptr->image_entries)[u].fd_parent_count > 0);
		(fake_cache_ptr->image_entries)[u].fd_parent_addrs = (haddr_t *)H5MM_xfree((fake_cache_ptr->image_entries)[u].fd_parent_addrs);
		(fake_cache_ptr->image_entries)[u].fd_parent_count = 0;
	    } /* end if */
            else 
		HDassert((fake_cache_ptr->image_entries)[u].fd_parent_count == 0);

	    HDassert((cache_ptr->image_entries)[u].image_ptr);
            HDassert((fake_cache_ptr->image_entries)[u].image_ptr);
            HDassert(!HDmemcmp((cache_ptr->image_entries)[u].image_ptr,
                               (fake_cache_ptr->image_entries)[u].image_ptr,
                               (cache_ptr->image_entries)[u].size));

	    (fake_cache_ptr->image_entries)[u].image_ptr = H5MM_xfree((fake_cache_ptr->image_entries)[u].image_ptr);
	} /* end for */

        HDassert((size_t)(q - (const uint8_t *)cache_ptr->image_buffer) == cache_ptr->image_data_len - H5F_SIZEOF_CHKSUM);

        /* compute the checksum  */
        old_chksum = chksum;
        chksum = H5_checksum_metadata(cache_ptr->image_buffer, (size_t)(cache_ptr->image_data_len - H5F_SIZEOF_CHKSUM), 0);
	HDassert(chksum == old_chksum);

	fake_cache_ptr->image_entries = (H5C_image_entry_t *)H5MM_xfree(fake_cache_ptr->image_entries);
	fake_cache_ptr = (H5C_t *)H5MM_xfree(fake_cache_ptr);
    } /* end block */
#endif /* NDEBUG */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__construct_cache_image_buffer() */


/*-------------------------------------------------------------------------
 * Function:    H5C__generate_cache_image()
 *
 * Purpose:	Generate the cache image and write it to the file, if
 *		directed.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  Quincey Koziol
 *              1/26/17
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C__generate_cache_image(H5F_t *f, H5C_t *cache_ptr)
{
    herr_t 	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(cache_ptr == f->shared->cache);
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);

    /* Construct cache image */
    if(H5C__construct_cache_image_buffer(f, cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't create metadata cache image")

    /* Free image entries array */
    if(H5C__free_image_entries_array(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't free image entries array")

    /* Write cache image block if so configured */
    if(cache_ptr->image_ctl.flags & H5C_CI__GEN_MDC_IMAGE_BLK) {
        if(H5C__write_cache_image(f, cache_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't write metadata cache image block to file")

        H5C__UPDATE_STATS_FOR_CACHE_IMAGE_CREATE(cache_ptr);
    } /* end if */

    /* Free cache image buffer */
    HDassert(cache_ptr->image_buffer);
    cache_ptr->image_buffer = H5MM_xfree(cache_ptr->image_buffer);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__generate_cache_image() */


/*-------------------------------------------------------------------------
 * Function:    H5C__deserialize_prefetched_entry()
 *
 * Purpose:     Deserialize the supplied prefetched entry entry, and return
 *		a pointer to the deserialized entry in *entry_ptr_ptr. 
 *		If successful, remove the prefetched entry from the cache,
 *		and free it.  Insert the deserialized entry into the cache.
 *
 *		Note that the on disk image of the entry is not freed -- 
 *		a pointer to it is stored in the deserialized entries'
 *		image_ptr field, and its image_up_to_date field is set to
 *		TRUE unless the entry is dirtied by the deserialize call.
 *
 *		If the prefetched entry is a flush dependency child,
 *		destroy that flush dependency prior to calling the 
 *		deserialize callback.  If appropriate, the flush dependency
 *		relationship will be recreated by the cache client.
 *
 *		If the prefetched entry is a flush dependency parent,
 *		destroy the flush dependency relationship with all its 
 *		children.  As all these children must be prefetched entries,
 *		recreate these flush dependency relationships with 
 *		deserialized entry after it is inserted in the cache.
 *
 *		Since deserializing a prefetched entry is semantically 
 *		equivalent to a load, issue an entry loaded nofification 
 *		if the notify callback is defined.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 *		Note that *entry_ptr_ptr is undefined on failure.
 *
 * Programmer:  John Mainzer, 8/10/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C__deserialize_prefetched_entry(H5F_t *f, H5C_t *cache_ptr,
    H5C_cache_entry_t **entry_ptr_ptr, const H5C_class_t *type,
    haddr_t addr, void *udata)
{
    hbool_t		dirty = FALSE;  /* Flag indicating whether thing was 
                                         * dirtied during deserialize 
                                         */
    size_t              len;            /* Size of image in file */
    void *		thing = NULL;   /* Pointer to thing loaded */
    H5C_cache_entry_t * pf_entry_ptr;   /* pointer to the prefetched entry   */
                                        /* supplied in *entry_ptr_ptr.       */
    H5C_cache_entry_t *	ds_entry_ptr;   /* Alias for thing loaded, as cache 
                                         * entry 
                                         */
    H5C_cache_entry_t** fd_children = NULL; /* Pointer to a dynamically      */
                                        /* allocated array of pointers to    */
                                        /* the flush dependency children of  */
                                        /* the prefetched entry, or NULL if  */
                                        /* that array does not exist.        */
    unsigned            flush_flags = (H5C__FLUSH_INVALIDATE_FLAG | 
				       H5C__FLUSH_CLEAR_ONLY_FLAG);
    int			i;
    herr_t      	ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_PACKAGE

    /* sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->cache);
    HDassert(f->shared->cache == cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(entry_ptr_ptr);
    HDassert(*entry_ptr_ptr);
    pf_entry_ptr = *entry_ptr_ptr;
    HDassert(pf_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
    HDassert(pf_entry_ptr->type);
    HDassert(pf_entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID);
    HDassert(pf_entry_ptr->prefetched);
    HDassert(pf_entry_ptr->image_up_to_date);
    HDassert(pf_entry_ptr->image_ptr);
    HDassert(pf_entry_ptr->size > 0);
    HDassert(pf_entry_ptr->addr == addr);
    HDassert(type);
    HDassert(type->id == pf_entry_ptr->prefetch_type_id);
    HDassert(type->mem_type == cache_ptr->class_table_ptr[type->id]->mem_type);

    /* verify absence of prohibited or unsupported type flag combinations */
    HDassert(!(type->flags & H5C__CLASS_SKIP_READS));
 
    /* Can't see how skip reads could be usefully combined with 
     * either the speculative read flag.  Hence disallow.
     */
    HDassert(!((type->flags & H5C__CLASS_SKIP_READS) &&
               (type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG)));
    HDassert(H5F_addr_defined(addr));
    HDassert(type->get_initial_load_size);
    HDassert(type->deserialize);

    /* if *pf_entry_ptr is a flush dependency child, destroy all such
     * relationships now.  The client will restore the relationship(s) with
     * the deserialized entry if appropriate.
     */
    HDassert(pf_entry_ptr->fd_parent_count == pf_entry_ptr->flush_dep_nparents);
    for(i = (int)(pf_entry_ptr->fd_parent_count) - 1; i >= 0; i--) {
        HDassert(pf_entry_ptr->flush_dep_parent);
        HDassert(pf_entry_ptr->flush_dep_parent[i]);
        HDassert(pf_entry_ptr->flush_dep_parent[i]->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
        HDassert(pf_entry_ptr->flush_dep_parent[i]->flush_dep_nchildren > 0);
        HDassert(pf_entry_ptr->fd_parent_addrs);
        HDassert(pf_entry_ptr->flush_dep_parent[i]->addr == pf_entry_ptr->fd_parent_addrs[i]);
        
        if(H5C_destroy_flush_dependency(pf_entry_ptr->flush_dep_parent[i], pf_entry_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL, "can't destroy pf entry parent flush dependency")

        pf_entry_ptr->fd_parent_addrs[i] = HADDR_UNDEF;
    } /* end for */
    HDassert(pf_entry_ptr->flush_dep_nparents == 0);

    /* If *pf_entry_ptr is a flush dependency parent, destroy its flush 
     * dependency relationships with all its children (which must be 
     * prefetched entries as well).
     *
     * These flush dependency relationships will have to be restored 
     * after the deserialized entry is inserted into the cache in order
     * to transfer these relationships to the new entry.  Hence save the
     * pointers to the flush dependency children of *pf_enty_ptr for later
     * use.
     */
    if(pf_entry_ptr->fd_child_count > 0) {
        if(NULL == (fd_children = (H5C_cache_entry_t **)H5MM_calloc(sizeof(H5C_cache_entry_t **) * (size_t)(pf_entry_ptr->fd_child_count + 1))))
            HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for fd child ptr array")

        if(H5C__destroy_pf_entry_child_flush_deps(cache_ptr, pf_entry_ptr, fd_children) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL, "can't destroy pf entry child flush dependency(s).")
    } /* end if */

    /* Since the size of the on disk image is known exactly, there is 
     * no need for either a call to the get_initial_load_size() callback, 
     * or retries if the H5C__CLASS_SPECULATIVE_LOAD_FLAG flag is set.
     * Similarly, there is no need to clamp possible reads beyond
     * EOF.
     */
    len = pf_entry_ptr->size;

    /* Deserialize the prefetched on-disk image of the entry into the 
     * native memory form 
     */
    if(NULL == (thing = type->deserialize(pf_entry_ptr->image_ptr, len, udata, &dirty)))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, FAIL, "Can't deserialize image")
    ds_entry_ptr = (H5C_cache_entry_t *)thing;

    /* In general, an entry should be clean just after it is loaded.
     *
     * However, when this code is used in the metadata cache, it is
     * possible that object headers will be dirty at this point, as
     * the deserialize function will alter object headers if necessary to
     * fix an old bug.
     *
     * In the following assert:
     *
     * 	HDassert( ( dirty == FALSE ) || ( type->id == 5 || type->id == 6 ) );
     *
     * note that type ids 5 & 6 are associated with object headers in the 
     * metadata cache.
     *
     * When we get to using H5C for other purposes, we may wish to
     * tighten up the assert so that the loophole only applies to the
     * metadata cache.
     *
     * Note that at present, dirty can't be set to true with prefetched 
     * entries.  However this may change, so include this functionality
     * against that posibility.
     *
     * Also, note that it is possible for a prefetched entry to be dirty --
     * hence the value assigned to ds_entry_ptr->is_dirty below.
     */

    HDassert( ( dirty == FALSE ) || ( type->id == 5 || type->id == 6) );

    ds_entry_ptr->magic                     	= H5C__H5C_CACHE_ENTRY_T_MAGIC;
    ds_entry_ptr->cache_ptr                 	= f->shared->cache;
    ds_entry_ptr->addr                      	= addr;
    ds_entry_ptr->size                      	= len;
    HDassert(ds_entry_ptr->size < H5C_MAX_ENTRY_SIZE);
    ds_entry_ptr->image_ptr                 	= pf_entry_ptr->image_ptr;
    ds_entry_ptr->image_up_to_date          	= !dirty;
    ds_entry_ptr->type                      	= type;
    ds_entry_ptr->is_dirty	            	= dirty | pf_entry_ptr->is_dirty;
    ds_entry_ptr->dirtied                   	= FALSE;
    ds_entry_ptr->is_protected              	= FALSE;
    ds_entry_ptr->is_read_only              	= FALSE;
    ds_entry_ptr->ro_ref_count              	= 0;
    ds_entry_ptr->is_pinned                 	= FALSE;
    ds_entry_ptr->in_slist                  	= FALSE;
    ds_entry_ptr->flush_marker              	= FALSE;
#ifdef H5_HAVE_PARALLEL
    ds_entry_ptr->clear_on_unprotect        	= FALSE;
    ds_entry_ptr->flush_immediately         	= FALSE;
    ds_entry_ptr->coll_access               	= FALSE;
#endif /* H5_HAVE_PARALLEL */
    ds_entry_ptr->flush_in_progress         	= FALSE;
    ds_entry_ptr->destroy_in_progress       	= FALSE;

    ds_entry_ptr->ring		            	= pf_entry_ptr->ring;

    /* Initialize flush dependency height fields */
    ds_entry_ptr->flush_dep_parent          	= NULL;
    ds_entry_ptr->flush_dep_nparents        	= 0;
    ds_entry_ptr->flush_dep_parent_nalloc   	= 0;
    ds_entry_ptr->flush_dep_nchildren       	= 0;
    ds_entry_ptr->flush_dep_ndirty_children 	= 0;
    ds_entry_ptr->flush_dep_nunser_children 	= 0;

    /* Initialize fields supporting the hash table: */
    ds_entry_ptr->ht_next                   	= NULL;
    ds_entry_ptr->ht_prev                   	= NULL;
    ds_entry_ptr->il_next                   	= NULL;
    ds_entry_ptr->il_prev                   	= NULL;

    /* Initialize fields supporting replacement policies: */
    ds_entry_ptr->next                      	= NULL;
    ds_entry_ptr->prev                      	= NULL;
#if H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS
    ds_entry_ptr->aux_next                  	= NULL;
    ds_entry_ptr->aux_prev                  	= NULL;
#endif /* H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS */
#ifdef H5_HAVE_PARALLEL
    pf_entry_ptr->coll_next                 	= NULL;
    pf_entry_ptr->coll_prev                 	= NULL;
#endif /* H5_HAVE_PARALLEL */

    /* Initialize cache image related fields */
    ds_entry_ptr->include_in_image          	= FALSE;
    ds_entry_ptr->lru_rank	            	= 0;
    ds_entry_ptr->image_dirty	            	= FALSE;
    ds_entry_ptr->fd_parent_count           	= 0;
    ds_entry_ptr->fd_parent_addrs           	= NULL;
    ds_entry_ptr->fd_child_count            	= pf_entry_ptr->fd_child_count;
    ds_entry_ptr->fd_dirty_child_count      	= 0;
    ds_entry_ptr->image_fd_height           	= 0;
    ds_entry_ptr->prefetched	            	= FALSE;
    ds_entry_ptr->prefetch_type_id          	= 0;
    ds_entry_ptr->age		          	= 0;
    ds_entry_ptr->prefetched_dirty              = pf_entry_ptr->prefetched_dirty;
#ifndef NDEBUG  /* debugging field */
    ds_entry_ptr->serialization_count           = 0;
#endif /* NDEBUG */

    H5C__RESET_CACHE_ENTRY_STATS(ds_entry_ptr);

    /* Apply to to the newly deserialized entry */
    if(H5C__tag_entry(cache_ptr, ds_entry_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTTAG, FAIL, "Cannot tag metadata entry")

    /* We have successfully deserialized the prefetched entry.
     *
     * Before we return a pointer to the deserialized entry, we must remove
     * the prefetched entry from the cache, discard it, and replace it with 
     * the deserialized entry.  Note that we do not free the prefetched 
     * entries image, as that has been transferred to the deserialized
     * entry.
     *
     * Also note that we have not yet restored any flush dependencies.  This
     * must wait until the deserialized entry is inserted in the cache.
     *
     * To delete the prefetched entry from the cache:
     *
     *  1) Set pf_entry_ptr->image_ptr to NULL.  Since we have already
     *     transferred the buffer containing the image to *ds_entry_ptr,
     *	   this is not a memory leak.
     * 
     *  2) Call H5C__flush_single_entry() with the H5C__FLUSH_INVALIDATE_FLAG
     *     and H5C__FLUSH_CLEAR_ONLY_FLAG flags set.
     */
    pf_entry_ptr->image_ptr = NULL; 
    if(pf_entry_ptr->is_dirty) {
        HDassert(pf_entry_ptr->in_slist);
        flush_flags |= H5C__DEL_FROM_SLIST_ON_DESTROY_FLAG;
    } /* end if */

    if(H5C__flush_single_entry(f, pf_entry_ptr, flush_flags) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, "can't expunge prefetched entry")

#ifndef NDEGUG /* verify deletion */
    H5C__SEARCH_INDEX(cache_ptr, addr, pf_entry_ptr, FAIL);

    HDassert(NULL == pf_entry_ptr);
#endif /* NDEBUG */

    /* Insert the deserialized entry into the cache.  */
    H5C__INSERT_IN_INDEX(cache_ptr, ds_entry_ptr, FAIL)

    HDassert(!ds_entry_ptr->in_slist);
    if(ds_entry_ptr->is_dirty)
        H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, ds_entry_ptr, FAIL)

    H5C__UPDATE_RP_FOR_INSERTION(cache_ptr, ds_entry_ptr, FAIL)

    /* Deserializing a prefetched entry is the conceptual equivalent of 
     * loading it from file.  If the deserialized entry has a notify callback,
     * send an "after load" notice now that the deserialized entry is fully
     * integrated into the cache.
     */
    if(ds_entry_ptr->type->notify &&
            (ds_entry_ptr->type->notify)(H5C_NOTIFY_ACTION_AFTER_LOAD, ds_entry_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry loaded into cache")

    /* Restore flush dependencies with the flush dependency children of 
     * of the prefetched entry.  Note that we must protect *ds_entry_ptr 
     * before the call to avoid triggering sanity check failures, and 
     * then unprotect it afterwards.
     */
    i = 0;
    if(fd_children != NULL) {
        H5C__UPDATE_RP_FOR_PROTECT(cache_ptr, ds_entry_ptr, FAIL)
        ds_entry_ptr->is_protected = TRUE;
        while(fd_children[i] != NULL) {
            /* Sanity checks */
            HDassert((fd_children[i])->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
            HDassert((fd_children[i])->prefetched);
            HDassert((fd_children[i])->fd_parent_count > 0);
            HDassert((fd_children[i])->fd_parent_addrs);

#ifndef NDEBUG
            {
                int j;
                hbool_t found;

                j = 0;
                found = FALSE;
                while((j < (int)((fd_children[i])->fd_parent_count)) && (!found)) {
                    if((fd_children[i])->fd_parent_addrs[j] == ds_entry_ptr->addr)
                        found = TRUE;

                    j++;
                } /* end while */
                HDassert(found);
            }
#endif /* NDEBUG */

            if(H5C_create_flush_dependency(ds_entry_ptr, fd_children[i]) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTDEPEND, FAIL, "Can't restore child flush dependency")

            i++;
        } /* end while */

        H5C__UPDATE_RP_FOR_UNPROTECT(cache_ptr, ds_entry_ptr, FAIL);
        ds_entry_ptr->is_protected = FALSE;
    } /* end if ( fd_children != NULL ) */
    HDassert((unsigned)i == ds_entry_ptr->fd_child_count);

    ds_entry_ptr->fd_child_count = 0;
    H5C__UPDATE_STATS_FOR_PREFETCH_HIT(cache_ptr)

    /* finally, pass ds_entry_ptr back to the caller */
    *entry_ptr_ptr = ds_entry_ptr;

done:
    if(fd_children)
        fd_children = (H5C_cache_entry_t **)H5MM_xfree((void *)fd_children);

    /* Release resources on error */
    if(FAIL == ret_value)
        if(thing && type->free_icr(thing) < 0)
            HDONE_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "free_icr callback failed")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__deserialize_prefetched_entry() */


/*-------------------------------------------------------------------------
 * Function:    H5C__free_image_entries_array
 *
 * Purpose:     If the image entries array exists, free the image 
 *		associated with each entry, and then free the image 
 *		entries array proper.
 *
 *		Note that by the time this function is called, the cache
 *		should have removed all entries from its data structures.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *              8/4/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__free_image_entries_array(H5C_t * cache_ptr)
{
    FUNC_ENTER_STATIC_NOERR

    /* Sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->close_warning_received);
    HDassert(cache_ptr->image_ctl.generate_image);
    HDassert(cache_ptr->index_len == 0);

    /* Check for entries to free */
    if(cache_ptr->image_entries != NULL) {
        unsigned u;     /* Local index variable */

        for(u = 0; u < cache_ptr->num_entries_in_image; u++) {
            H5C_image_entry_t *ie_ptr;          /* Image entry to release */

            /* Get pointer to image entry */
 	    ie_ptr = &((cache_ptr->image_entries)[u]);

            /* Sanity checks */ 
	    HDassert(ie_ptr);
            HDassert(ie_ptr->magic == H5C_IMAGE_ENTRY_T_MAGIC);
	    HDassert(ie_ptr->image_ptr);

	    /* Free the parent addrs array if appropriate */
	    if(ie_ptr->fd_parent_addrs) {
		HDassert(ie_ptr->fd_parent_count > 0);

		ie_ptr->fd_parent_addrs = (haddr_t *)H5MM_xfree(ie_ptr->fd_parent_addrs);
            } /* end if */
            else
		HDassert(ie_ptr->fd_parent_count == 0);

            /* Free the image */
            ie_ptr->image_ptr = H5MM_xfree(ie_ptr->image_ptr);

	    /* Set magic field to bad magic so we can detect freed entries */
	    ie_ptr->magic = H5C_IMAGE_ENTRY_T_BAD_MAGIC;
	} /* end for */

	/* Free the image entries array */
	cache_ptr->image_entries = (H5C_image_entry_t *)H5MM_xfree(cache_ptr->image_entries);
    } /* end if */

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5C__free_image_entries_array() */


/*-------------------------------------------------------------------------
 * Function:    H5C_force_cache_image_load()
 *
 * Purpose:     On rare occasions, it is necessary to run 
 *		H5MF_tidy_self_referential_fsm_hack() prior to the first
 *              metadata cache access.  This is a problem as if there is a 
 *              cache image at the end of the file, that routine will 
 *              discard it.
 *
 *              We solve this issue by calling this function, which will
 *		load the cache image and then call 
 *              H5MF_tidy_self_referential_fsm_hack() to discard it.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *              1/11/17
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_force_cache_image_load(H5F_t *f)
{
    H5C_t *cache_ptr;
    herr_t ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    cache_ptr = f->shared->cache;
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->load_image);

    /* Load the cache image, if requested */
    if(cache_ptr->load_image) {
        cache_ptr->load_image = FALSE;
        if(H5C__load_cache_image(f) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, FAIL, "can't load cache image")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_force_cache_image_load() */


/*-------------------------------------------------------------------------
 * Function:    H5C_get_cache_image_config
 *
 * Purpose:     Copy the current configuration for cache image generation
 *              on file close into the instance of H5C_cache_image_ctl_t
 *              pointed to by config_ptr.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *              7/3/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_get_cache_image_config(const H5C_t * cache_ptr,
    H5C_cache_image_ctl_t *config_ptr)
{
    herr_t ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if((cache_ptr == NULL) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad cache_ptr on entry")
    if(config_ptr == NULL)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad config_ptr on entry")

    *config_ptr = cache_ptr->image_ctl;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_get_cache_image_config() */


/*-------------------------------------------------------------------------
 * Function:    H5C_image_stats
 *
 * Purpose:     Prints statistics specific to the cache image.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              10/26/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
#if H5C_COLLECT_CACHE_STATS
H5C_image_stats(H5C_t * cache_ptr, hbool_t print_header)
#else /* H5C_COLLECT_CACHE_STATS */
H5C_image_stats(H5C_t * cache_ptr, hbool_t H5_ATTR_UNUSED print_header)
#endif /* H5C_COLLECT_CACHE_STATS */
{
#if H5C_COLLECT_CACHE_STATS
    int         i;
    int64_t     total_hits = 0;
    int64_t     total_misses = 0;
    double      hit_rate;
    double      prefetch_use_rate;
#endif /* H5C_COLLECT_CACHE_STATS */
    herr_t      ret_value = SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if(!cache_ptr || cache_ptr->magic != H5C__H5C_T_MAGIC)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Bad cache_ptr")

#if H5C_COLLECT_CACHE_STATS
    for(i = 0; i <= cache_ptr->max_type_id; i++) {
        total_hits              += cache_ptr->hits[i];
        total_misses            += cache_ptr->misses[i];
    } /* end for */

    if((total_hits > 0) || (total_misses > 0))
        hit_rate = (double)100.0f * ((double)(total_hits)) / ((double)(total_hits + total_misses));
    else
        hit_rate = 0.0f;

    if(cache_ptr->prefetches > 0)
        prefetch_use_rate = (double)100.0f * ((double)(cache_ptr->prefetch_hits)) /
                   ((double)(cache_ptr->prefetches));
    else
        prefetch_use_rate = 0.0f;

    if(print_header) {
        HDfprintf(stdout,
           "\nhit     prefetches      prefetch              image  pf hit\n");
        HDfprintf(stdout,
             "rate:   total:  dirty:  hits:  flshs:  evct:  size:  rate:\n");
    } /* end if */

    HDfprintf(stdout,
           "%3.1lf    %5lld   %5lld   %5lld  %5lld   %5lld   %5lld   %3.1lf\n",
            hit_rate,
            (long long)(cache_ptr->prefetches),
            (long long)(cache_ptr->dirty_prefetches),
            (long long)(cache_ptr->prefetch_hits),
            (long long)(cache_ptr->flushes[H5AC_PREFETCHED_ENTRY_ID]),
            (long long)(cache_ptr->evictions[H5AC_PREFETCHED_ENTRY_ID]),
            (long long)(cache_ptr->last_image_size),
            prefetch_use_rate);
#endif /* H5C_COLLECT_CACHE_STATS */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_image_stats() */


/*-------------------------------------------------------------------------
 * Function:    H5C__read_cache_image
 *
 * Purpose:	Load the metadata cache image from the specified location
 *		in the file, and return it in the supplied buffer.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/16/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__read_cache_image(H5F_t *f, H5C_t *cache_ptr)
{
    herr_t              ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(cache_ptr);
    HDassert(H5F_addr_defined(cache_ptr->image_addr));
    HDassert(cache_ptr->image_len > 0);
    HDassert(cache_ptr->image_buffer);

#ifdef H5_HAVE_PARALLEL
{
    H5AC_aux_t *aux_ptr = (H5AC_aux_t *)cache_ptr->aux_ptr;
    int mpi_result;

    if ( ( NULL == aux_ptr ) || ( aux_ptr->mpi_rank == 0 ) ) {

	HDassert((NULL == aux_ptr) || 
                 (aux_ptr->magic == H5AC__H5AC_AUX_T_MAGIC));
#endif /* H5_HAVE_PARALLEL */

	/* Read the buffer (if serial access, or rank 0 of parallel access) */
        if(H5F_block_read(f, H5FD_MEM_SUPER, cache_ptr->image_addr, 
                cache_ptr->image_len, cache_ptr->image_buffer) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_READERROR, FAIL, "Can't read metadata cache image block")

        H5C__UPDATE_STATS_FOR_CACHE_IMAGE_READ(cache_ptr)

#ifdef H5_HAVE_PARALLEL
	if ( aux_ptr ) {

	    /* Broadcast cache image */
            if ( MPI_SUCCESS != 
                 (mpi_result = MPI_Bcast(cache_ptr->image_buffer, 
                                         (int)cache_ptr->image_len, MPI_BYTE, 
                                         0, aux_ptr->mpi_comm)) )

                HMPI_GOTO_ERROR(FAIL, "MPI_Bcast failed", mpi_result)

        } /* end if */
    } /* end if */
    else if ( aux_ptr ) {

        /* Retrieve the contents of the metadata cache image from process 0 */
        if ( MPI_SUCCESS != 
             (mpi_result = MPI_Bcast(cache_ptr->image_buffer, 
                                     (int)cache_ptr->image_len, MPI_BYTE, 
                                     0, aux_ptr->mpi_comm)) )

            HMPI_GOTO_ERROR(FAIL, "can't receive cache image MPI_Bcast", \
                            mpi_result)
    } /* end else-if */
} /* end block */
#endif /* H5_HAVE_PARALLEL */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__read_cache_image() */


/*-------------------------------------------------------------------------
 * Function:    H5C__load_cache_image
 *
 * Purpose:     Read the cache image superblock extension message and
 *		delete it if so directed.
 *
 *		Then load the cache image block at the specified location,
 *		decode it, and insert its contents into the metadata
 *		cache.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *		7/6/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C__load_cache_image(H5F_t *f)
{
    H5C_t *             cache_ptr;
    herr_t		ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    cache_ptr = f->shared->cache;
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);

    /* If the image address is defined, load the image, decode it, 
     * and insert its contents into the metadata cache. 
     *
     * Note that under normal operating conditions, it is an error if the 
     * image address is HADDR_UNDEF.  However, to facilitate testing,
     * we allow this special value of the image address which means that
     * no image exists, and that the load operation should be skipped 
     * silently.  
     */
    if(H5F_addr_defined(cache_ptr->image_addr)) {
        /* Sanity checks */
	HDassert(cache_ptr->image_len > 0);
        HDassert(cache_ptr->image_buffer == NULL);

	/* Allocate space for the image */
        if(NULL == (cache_ptr->image_buffer = H5MM_malloc(cache_ptr->image_len + 1)))
            HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for cache image buffer")

	/* Load the image from file */
	if(H5C__read_cache_image(f, cache_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_READERROR, FAIL, "Can't read metadata cache image block")

	/* Reconstruct cache contents, from image */
	if(H5C__reconstruct_cache_contents(f, cache_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTDECODE, FAIL, "Can't reconstruct cache contents from image block")

	/* Free the image buffer */
        cache_ptr->image_buffer = H5MM_xfree(cache_ptr->image_buffer);

        /* Update stats -- must do this now, as we are about
         * to discard the size of the cache image.
         */
        H5C__UPDATE_STATS_FOR_CACHE_IMAGE_LOAD(cache_ptr)

        cache_ptr->image_loaded = TRUE;
    } /* end if */

    /* If directed, free the on disk metadata cache image */
    if(cache_ptr->delete_image) {
        if(H5F__super_ext_remove_msg(f, H5O_MDCI_MSG_ID) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove metadata cache image message from superblock extension")

        /* Reset image block values */
        cache_ptr->image_len = 0;
        cache_ptr->image_data_len = 0;
        cache_ptr->image_addr = HADDR_UNDEF;
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__load_cache_image() */


/*-------------------------------------------------------------------------
 * Function:    H5C_load_cache_image_on_next_protect()
 *
 * Purpose:     Note the fact that a metadata cache image superblock 
 *		extension message exists, along with the base address
 *		and length of the metadata cache image block.
 *
 *		Once this notification is received the metadata cache 
 *		image block must be read, decoded, and loaded into the 
 *		cache on the next call to H5C_protect().
 *
 *		Further, if the file is opened R/W, the metadata cache 
 *		image superblock extension message must be deleted from 
 *		the superblock extension and the image block freed
 *
 *		Contrawise, if the file is openened R/O, the metadata
 *		cache image superblock extension message and image block
 *		must be left as is.  Further, any dirty entries in the
 *		cache image block must be marked as clean to avoid 
 *		attempts to write them on file close.
 *
 * Return:      SUCCEED 
 *
 * Programmer:  John Mainzer
 *		7/6/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_load_cache_image_on_next_protect(H5F_t *f, haddr_t addr, hsize_t len,
    hbool_t rw)
{
    H5C_t *cache_ptr;

    FUNC_ENTER_NOAPI_NOINIT_NOERR

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    cache_ptr = f->shared->cache;
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);

    /* Set information needed to load cache image */
    cache_ptr->image_addr   = addr,
    cache_ptr->image_len    = len;
    cache_ptr->load_image   = TRUE;
    cache_ptr->delete_image = rw;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5C_load_cache_image_on_next_protect() */


/*-------------------------------------------------------------------------
 * Function:    H5C__image_entry_cmp
 *
 * Purpose:     Comparison callback for qsort(3) on image entries.
 *		Entries are sorted first by flush dependency height,
 *		and then by LRU rank.
 *
 * Note:        Entries with a _greater_ flush dependency height should
 *		be sorted earlier than entries with lower heights, since
 *		leafs in the flush dependency graph are at height 0, and their
 *		parents need to be earlier in the image, so that they can
 *		construct their flush dependencies when decoded.
 *
 * Return:      An integer less than, equal to, or greater than zero if the
 *		first entry is considered to be respectively less than,
 *		equal to, or greater than the second.
 *
 * Programmer:  Quincey Koziol
 *		1/20/16
 *
 *-------------------------------------------------------------------------
 */
static int
H5C__image_entry_cmp(const void *_entry1, const void *_entry2)
{
    const H5C_image_entry_t *entry1 = (const H5C_image_entry_t *)_entry1;  /* Pointer to first image entry to compare */
    const H5C_image_entry_t *entry2 = (const H5C_image_entry_t *)_entry2;  /* Pointer to second image entry to compare */
    int ret_value = 0;          /* Return value */

    FUNC_ENTER_STATIC_NOERR

    /* Sanity checks */
    HDassert(entry1);
    HDassert(entry2);

    if(entry1->image_fd_height > entry2->image_fd_height)
        ret_value = -1;
    else if(entry1->image_fd_height < entry2->image_fd_height)
        ret_value = 1;
    else {
        /* Sanity check */
        HDassert(entry1->lru_rank >= -1);
        HDassert(entry2->lru_rank >= -1);

        if(entry1->lru_rank < entry2->lru_rank)
            ret_value = -1;
        else if(entry1->lru_rank > entry2->lru_rank)
            ret_value = 1;
    } /* end else */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__image_entry_cmp() */


/*-------------------------------------------------------------------------
 * Function:    H5C__prep_image_for_file_close
 *
 * Purpose:     The objective of the call is to allow the metadata cache 
 *		to do any preparatory work prior to generation of a 
 *		cache image.
 *
 *		In particular, the cache must 
 *
 *		1) serialize all its entries,
 *
 *		2) compute the size of the metadata cache image, 
 *
 *		3) allocate space for the metadata cache image, and
 *
 *		4) setup the metadata cache image superblock extension
 *		   message with the address and size of the metadata 
 *		   cache image.
 *
 *		The parallel case is complicated by the fact that 
 *		while all metadata caches must contain the same set of 
 *		dirty entries, there is no such requirement for clean 
 *		entries or the order that entries appear in the LRU.
 *
 *		Thus, there is no requirement that different processes
 *		will construct cache images of the same size.
 *
 *		This is not a major issue as long as all processes include 
 *		the same set of dirty entries in the cache -- as they 
 *		currently do (note that this will change when we implement 
 *		the ageout feature).  Since only the process zero cache 
 *		writes the cache image, all that is necessary is to 
 *		broadcast the process zero cache size for use in the 
 *		superblock extension messages and cache image block 
 *		allocations.
 *
 *		Note: At present, cache image is disabled in the 
 *		parallel case as the new collective metadata write 
 *		code must be modified to support cache image.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              7/3/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C__prep_image_for_file_close(H5F_t *f, hbool_t *image_generated)
{
    H5C_t *     cache_ptr = NULL;
    haddr_t     eoa_frag_addr = HADDR_UNDEF;
    hsize_t     eoa_frag_size = 0;
    herr_t	ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->cache);
    cache_ptr = f->shared->cache;
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(image_generated);

    /* If the file is opened and closed without any access to 
     * any group or data set, it is possible that the cache image (if 
     * it exists) has not been read yet.  Do this now if required.
     */
    if(cache_ptr->load_image) {
        cache_ptr->load_image = FALSE;
        if(H5C__load_cache_image(f) < 0)
	    HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, FAIL, "can't load cache image")
    } /* end if */

    /* Before we start to generate the cache image (if requested), verify
     * that the superblock supports superblock extension messages, and 
     * silently cancel any request for a cache image if it does not.
     *
     * Ideally, we would do this when the cache image is requested,
     * but the necessary information is not necessary available at that 
     * time -- hence this last minute check.
     *
     * Note that under some error conditions, the superblock will be 
     * undefined in this case as well -- if so, assume that the 
     * superblock does not support superblock extension messages.
     * Also verify that the file's high_bound is at least release
     * 1.10.x, otherwise cancel the request for a cache image
     */
    if((NULL == f->shared->sblock) ||
         (f->shared->sblock->super_vers < HDF5_SUPERBLOCK_VERSION_2) ||
         (f->shared->high_bound < H5F_LIBVER_V110)) {
        H5C_cache_image_ctl_t default_image_ctl = H5C__DEFAULT_CACHE_IMAGE_CTL;

        cache_ptr->image_ctl = default_image_ctl;
        HDassert(!(cache_ptr->image_ctl.generate_image));
    } /* end if */

    /* Generate the cache image, if requested */
    if(cache_ptr->image_ctl.generate_image) {
        /* Create the cache image super block extension message.
         * 
         * Note that the base address and length of the metadata cache
         * image are undefined at this point, and thus will have to be
         * updated later.
         *
         * Create the super block extension message now so that space 
         * is allocated for it (if necessary) before we allocate space
         * for the cache image block.
         *
         * To simplify testing, do this only if the 
         * H5C_CI__GEN_MDCI_SBE_MESG bit is set in 
         * cache_ptr->image_ctl.flags.
         */
        if(cache_ptr->image_ctl.flags & H5C_CI__GEN_MDCI_SBE_MESG)
            if(H5C__write_cache_image_superblock_msg(f, TRUE) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "creation of cache image SB mesg failed.")

        /* Serialize the cache */
        if(H5C__serialize_cache(f) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "serialization of the cache failed")

        /* Scan the cache and record data needed to construct the 
         * cache image.  In particular, for each entry we must record:
         *
         * 1) rank in LRU (if entry is in LRU)
         *
         * 2) Whether the entry is dirty prior to flush of 
         *    cache just prior to close.
         *
         * 3) Addresses of flush dependency parents (if any).
         *
         * 4) Number of flush dependency children (if any).  
         *
         * In passing, also compute the size of the metadata cache 
         * image.  With the recent modifications of the free space 
         * manager code, this size should be correct.
         */
        if(H5C__prep_for_file_close__scan_entries(f, cache_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "H5C__prep_for_file_close__scan_entries failed")
        HDassert(HADDR_UNDEF == cache_ptr->image_addr);

#ifdef H5_HAVE_PARALLEL
        /* In the parallel case, overwrite the image_len with the 
         * value computed by process 0.
         */
        if(cache_ptr->aux_ptr) { /* we have multiple processes */
            int mpi_result;
            unsigned p0_image_len;
            H5AC_aux_t * aux_ptr;

            aux_ptr = (H5AC_aux_t *)cache_ptr->aux_ptr;
            if(aux_ptr->mpi_rank == 0) {
                aux_ptr->p0_image_len = (unsigned)cache_ptr->image_data_len;
                p0_image_len = aux_ptr->p0_image_len;

                if(MPI_SUCCESS != (mpi_result = MPI_Bcast(&p0_image_len, 1, MPI_UNSIGNED, 0, aux_ptr->mpi_comm)))
                    HMPI_GOTO_ERROR(FAIL, "MPI_Bcast failed", mpi_result)

                HDassert(p0_image_len == aux_ptr->p0_image_len);
            } /* end if */
            else {
                if(MPI_SUCCESS != (mpi_result = MPI_Bcast(&p0_image_len, 1, MPI_UNSIGNED, 0, aux_ptr->mpi_comm)))
                    HMPI_GOTO_ERROR(FAIL, "MPI_Bcast failed", mpi_result)
                
                aux_ptr->p0_image_len = p0_image_len;
            } /* end else */

            /* Allocate space for a cache image of size equal to that 
             * computed by the process 0.  This may be different from 
             * cache_ptr->image_data_len if mpi_rank != 0.  However, since
             * cache image write is suppressed on all processes other than 
             * process 0, this doesn't matter.
             *
             * Note that we allocate the cache image directly from the file 
             * driver so as to avoid unsettling the free space managers.
             */
            if(HADDR_UNDEF == (cache_ptr->image_addr = H5FD_alloc(f->shared->lf, H5FD_MEM_SUPER, f,
                        (hsize_t)p0_image_len, &eoa_frag_addr, &eoa_frag_size)))
                HGOTO_ERROR(H5E_CACHE, H5E_NOSPACE, FAIL, "can't allocate file space for metadata cache image")
        } /* end if */
        else
#endif /* H5_HAVE_PARALLEL */
            /* Allocate the cache image block.  Note that we allocate this 
             * this space directly from the file driver so as to avoid 
             * unsettling the free space managers.
             */
            if(HADDR_UNDEF == (cache_ptr->image_addr = H5FD_alloc(f->shared->lf, H5FD_MEM_SUPER, f,
                        (hsize_t)(cache_ptr->image_data_len), &eoa_frag_addr, &eoa_frag_size)))
                HGOTO_ERROR(H5E_CACHE, H5E_NOSPACE, FAIL, "can't allocate file space for metadata cache image")

        /* Make note of the eoa after allocation of the cache image
         * block.  This value is used for sanity checking when we
         * shutdown the self referential free space managers after
         * we destroy the metadata cache.
         */
        HDassert(HADDR_UNDEF == f->shared->eoa_post_mdci_fsalloc);
        if(HADDR_UNDEF == (f->shared->eoa_post_mdci_fsalloc = H5FD_get_eoa(f->shared->lf, H5FD_MEM_DEFAULT)) )
            HGOTO_ERROR(H5E_FILE, H5E_CANTGET, FAIL, "unable to get file size")

        /* For now, drop any fragment left over from the allocation of the
         * image block on the ground.  A fragment should only be returned
         * if the underlying file alignment is greater than 1.
         *
         * Clean this up eventually by extending the size of the cache
         * image block to the next alignement boundary, and then setting
         * the image_data_len to the actual size of the cache_image.
         *
         * On the off chance that there is some other way to get a 
         * a fragment on a cache image allocation, leave the following
         * assertion in the code so we will find out.
         */
        HDassert((eoa_frag_size == 0) || (f->shared->alignment != 1));

        /* Eventually it will be possible for the length of the cache image
         * block on file to be greater than the size of the data it 
         * contains.  However, for now they must be the same.  Set 
         * cache_ptr->image_len accordingly.
         */
        cache_ptr->image_len = cache_ptr->image_data_len;

        /* update the metadata cache image superblock extension 
         * message with the new cache image block base address and 
         * length.
         *
         * to simplify testing, do this only if the 
         * H5C_CI__GEN_MDC_IMAGE_BLK bit is set in 
         * cache_ptr->image_ctl.flags.
         */
        if(cache_ptr->image_ctl.flags & H5C_CI__GEN_MDC_IMAGE_BLK)
            if(H5C__write_cache_image_superblock_msg(f, FALSE) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "update of cache image SB mesg failed")

        /* At this point:
         *
         *   1) space in the file for the metadata cache image
         *      is allocated, 
         *
         *   2) the metadata cache image superblock extension 
         *      message exists and (if so configured) contains 
         *      the correct data,
         *
         *   3) All entries in the cache that will appear in the 
         *      cache image are serialized with up to date images.
         *
         *      Since we just updated the cache image message,
         *      the super block extension message is dirty.  However,
         *      since the superblock and the superblock extension 
         *      can't be included in the cache image, this is a non-
         *      issue.
         *
         *   4) All entries in the cache that will be include in
         *      the cache are marked as such, and we have a count
         *      of same.
         *
         *   5) Flush dependency heights are calculated for all 
         *      entries that will be included in the cache image.
         *
         * If there are any entries to be included in the metadata cache
         * image, allocate, populate, and sort the image_entries array.  
         *
         * If the metadata cache image will be empty, delete the 
         * metadata cache image superblock extension message, set 
         * cache_ptr->image_ctl.generate_image to FALSE.  This will
         * allow the file close to continue normally without the 
         * unecessary generation of the metadata cache image.
         */
        if(cache_ptr->num_entries_in_image > 0) {
            if(H5C__prep_for_file_close__setup_image_entries_array(cache_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTINIT, FAIL, "can't setup image entries array.")

            /* Sort the entries */
            HDqsort(cache_ptr->image_entries, (size_t)cache_ptr->num_entries_in_image,
                    sizeof(H5C_image_entry_t), H5C__image_entry_cmp);
        } /* end if */
        else { /* cancel creation of metadata cache image */
            HDassert(cache_ptr->image_entries == NULL);

            /* To avoid breaking the control flow tests, only delete 
             * the mdci superblock extension message if the 
             * H5C_CI__GEN_MDC_IMAGE_BLK flag is set in 
             * cache_ptr->image_ctl.flags.
             */
            if(cache_ptr->image_ctl.flags & H5C_CI__GEN_MDC_IMAGE_BLK)
                if(H5F__super_ext_remove_msg(f, H5O_MDCI_MSG_ID) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove MDC image msg from superblock ext")

            cache_ptr->image_ctl.generate_image = FALSE;
        } /* end else */

        /* Indicate that a cache image was generated */
        *image_generated = TRUE;
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__prep_image_for_file_close() */


/*-------------------------------------------------------------------------
 * Function:    H5C_set_cache_image_config
 *
 * Purpose:	If *config_ptr contains valid data, copy it into the 
 *		image_ctl field of *cache_ptr.  Make adjustments for 
 *		changes in configuration as required.
 *
 *              If the file is open read only, silently
 *              force the cache image configuration to its default
 *              (which disables construction of a cache image).
 *
 *              Note that in addition to being inapplicable in the
 *              read only case, cache image is also inapplicable if
 *              the superblock does not support superblock extension 
 *              messages.  Unfortunately, this information need not 
 *              be available at this point. Thus we check for this 
 *              later, in H5C_prep_for_file_close() and cancel the
 *              cache image request if appropriate.
 *
 *		Fail if the new configuration is invalid.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *		7/3/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_set_cache_image_config(const H5F_t *f, H5C_t *cache_ptr,
    H5C_cache_image_ctl_t *config_ptr)
{
    herr_t	ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->cache == f->shared->cache);

    /* Check arguments */
    if((cache_ptr == NULL) || (cache_ptr->magic != H5C__H5C_T_MAGIC))
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad cache_ptr on entry")

    /* Validate the config: */
    if(H5C_validate_cache_image_config(config_ptr) < 0)
        HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, FAIL, "invalid cache image configuration")

#ifdef H5_HAVE_PARALLEL
    /* The collective metadata write code is not currently compatible 
     * with cache image.  Until this is fixed, suppress cache image silently
     * if there is more than one process.
     *                                         JRM -- 11/8/16
     */
    if(cache_ptr->aux_ptr) {
	H5C_cache_image_ctl_t default_image_ctl = H5C__DEFAULT_CACHE_IMAGE_CTL;

        cache_ptr->image_ctl = default_image_ctl;
	HDassert(!(cache_ptr->image_ctl.generate_image));
    } /* end if */
    else {
#endif /* H5_HAVE_PARALLEL */
        /* A cache image can only be generated if the file is opened read / write
         * and the superblock supports superblock extension messages.  
         *
         * However, the superblock version is not available at this point -- 
         * hence we can only check the former requirement now.  Do the latter
         * check just before we construct the image..  
         *
         * If the file is opened read / write, apply the supplied configuration.
         *
         * If it is not, set the image configuration to the default, which has 
         * the effect of silently disabling the cache image if it was requested.
         */
        if(H5F_INTENT(f) & H5F_ACC_RDWR)
            cache_ptr->image_ctl = *config_ptr;
        else {
            H5C_cache_image_ctl_t default_image_ctl = H5C__DEFAULT_CACHE_IMAGE_CTL;

            cache_ptr->image_ctl = default_image_ctl;
            HDassert(!(cache_ptr->image_ctl.generate_image));
        } /* end else */
#ifdef H5_HAVE_PARALLEL
    } /* end else */
#endif /* H5_HAVE_PARALLEL */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_set_cache_image_config() */


/*-------------------------------------------------------------------------
 * Function:    H5C_validate_cache_image_config()
 *
 * Purpose:	Run a sanity check on the provided instance of struct 
 *		H5AC_cache_image_config_t.
 *
 *		Do nothing and return SUCCEED if no errors are detected,
 *		and flag an error and return FAIL otherwise.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              6/15/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_validate_cache_image_config(H5C_cache_image_ctl_t * ctl_ptr)
{
    herr_t              ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    if(ctl_ptr == NULL)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "NULL ctl_ptr on entry")
    if(ctl_ptr->version != H5C__CURR_CACHE_IMAGE_CTL_VER)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Unknown cache image control version")

    /* At present, we do not support inclusion of the adaptive resize
     * configuration in the cache image.  Thus the save_resize_status
     * field must be FALSE.
     */
    if(ctl_ptr->save_resize_status != FALSE)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "unexpected value in save_resize_status field")

    /* At present, we do not support prefetched entry ageouts.  Thus 
     * the entry_ageout field must be set to 
     * H5AC__CACHE_IMAGE__ENTRY_AGEOUT__NONE.
     */
    if(ctl_ptr->entry_ageout != H5AC__CACHE_IMAGE__ENTRY_AGEOUT__NONE)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "unexpected value in entry_ageout field")

    if((ctl_ptr->flags & ~H5C_CI__ALL_FLAGS) != 0)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "unknown flag set")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_validate_cache_image_config() */


/*************************************************************************/
/**************************** Private Functions: *************************/
/*************************************************************************/

/*-------------------------------------------------------------------------
 * Function:    H5C__cache_image_block_entry_header_size
 *
 * Purpose:     Compute the size of the header of the metadata cache
 *		image block, and return the value.
 *
 * Return:      Size of the header section of the metadata cache image 
 *		block in bytes.
 *
 * Programmer:  John Mainzer
 *		7/27/15
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5C__cache_image_block_entry_header_size(const H5F_t * f)
{
    size_t ret_value = 0;       /* Return value */

    FUNC_ENTER_STATIC_NOERR

    /* Set return value */
    ret_value = (size_t)( 1 +			/* type                     */
			  1 +			/* flags                    */
			  1 +			/* ring                     */
			  1 +			/* age                      */
			  2 +			/* dependency child count   */
			  2 +			/* dirty dep child count    */
			  2 +			/* dependency parent count  */
			  4 +			/* index in LRU             */
			  H5F_SIZEOF_ADDR(f) +  /* entry offset             */
			  H5F_SIZEOF_SIZE(f) ); /* entry length             */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__cache_image_block_entry_header_size() */


/*-------------------------------------------------------------------------
 * Function:    H5C__cache_image_block_header_size
 *
 * Purpose:     Compute the size of the header of the metadata cache
 *		image block, and return the value.
 *
 * Return:      Size of the header section of the metadata cache image 
 *		block in bytes.
 *
 * Programmer:  John Mainzer
 *		7/27/15
 *
 *-------------------------------------------------------------------------
 */
static size_t
H5C__cache_image_block_header_size(const H5F_t * f)
{
    size_t ret_value = 0;       /* Return value */

    FUNC_ENTER_STATIC_NOERR

    /* Set return value */
    ret_value = (size_t)( 4 +                   /* signature           */
			  1 +			/* version             */
			  1 +			/* flags               */
			  H5F_SIZEOF_SIZE(f) +	/* image data length   */
			  4 );			/* num_entries         */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__cache_image_block_header_size() */


/*-------------------------------------------------------------------------
 * Function:    H5C__decode_cache_image_header()
 *
 * Purpose:     Decode the metadata cache image buffer header from the 
 *		supplied buffer and load the data into the supplied instance
 *		of H5C_t.  Advances the buffer pointer to the first byte 
 *		after the header image, or unchanged on failure.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/6/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__decode_cache_image_header(const H5F_t *f, H5C_t *cache_ptr,
    const uint8_t **buf)
{
    uint8_t		version;
    uint8_t		flags;
    hbool_t		have_resize_status = FALSE;
    size_t 		actual_header_len;
    size_t		expected_header_len;
    const uint8_t *	p;
    herr_t		ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(buf);
    HDassert(*buf);

    /* Point to buffer to decode */
    p = *buf;

    /* Check signature */
    if(HDmemcmp(p, H5C__MDCI_BLOCK_SIGNATURE, (size_t)H5C__MDCI_BLOCK_SIGNATURE_LEN))
	HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad metadata cache image header signature")
    p += H5C__MDCI_BLOCK_SIGNATURE_LEN;

    /* Check version */
    version = *p++;
    if(version != (uint8_t)H5C__MDCI_BLOCK_VERSION_0)
	HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad metadata cache image version")

    /* Decode flags */
    flags = *p++;
    if(flags & H5C__MDCI_HEADER_HAVE_RESIZE_STATUS)	
	have_resize_status = TRUE;
    if(have_resize_status)
	HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "MDC resize status not yet supported")

    /* Read image data length */
    H5F_DECODE_LENGTH(f, p, cache_ptr->image_data_len);

    /* For now -- will become <= eventually */
    if(cache_ptr->image_data_len != cache_ptr->image_len)
	HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad metadata cache image data length")

    /* Read num entries */
    UINT32DECODE(p, cache_ptr->num_entries_in_image);
    if(cache_ptr->num_entries_in_image == 0) 
	HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad metadata cache entry count")

    /* Verify expected length of header */
    actual_header_len = (size_t)(p - *buf);
    expected_header_len = H5C__cache_image_block_header_size(f);
    if(actual_header_len != expected_header_len)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad header image len")

    /* Update buffer pointer */
    *buf = p;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__decode_cache_image_header() */

#ifndef NDEBUG

/*-------------------------------------------------------------------------
 * Function:    H5C__decode_cache_image_entry()
 *
 * Purpose:     Decode the metadata cache image entry from the supplied 
 *		buffer into the supplied instance of H5C_image_entry_t.
 *		This includes allocating a buffer for the entry image,
 *		loading it, and seting ie_ptr->image_ptr to point to 
 *		the buffer.
 *
 *		Advances the buffer pointer to the first byte 
 *		after the entry, or unchanged on failure.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/6/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__decode_cache_image_entry(const H5F_t *f, const H5C_t *cache_ptr,
    const uint8_t **buf, unsigned entry_num)
{
    hbool_t		is_dirty = FALSE;
    hbool_t		in_lru = FALSE;         /* Only used in assertions */
    hbool_t		is_fd_parent = FALSE;   /* Only used in assertions */
    hbool_t		is_fd_child = FALSE;    /* Only used in assertions */
    haddr_t 		addr;
    hsize_t		size = 0;
    void *		image_ptr;
    uint8_t             flags = 0;
    uint8_t		type_id;
    uint8_t		ring;
    uint8_t		age;
    uint16_t 		fd_child_count;
    uint16_t 		fd_dirty_child_count;
    uint16_t 		fd_parent_count;
    haddr_t           * fd_parent_addrs = NULL;
    int32_t		lru_rank;
    H5C_image_entry_t * ie_ptr = NULL;
    const uint8_t *	p;
    herr_t		ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(cache_ptr == f->shared->cache);
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(buf);
    HDassert(*buf);
    HDassert(entry_num < cache_ptr->num_entries_in_image);
    ie_ptr = &((cache_ptr->image_entries)[entry_num]);
    HDassert(ie_ptr);
    HDassert(ie_ptr->magic == H5C_IMAGE_ENTRY_T_MAGIC);

    /* Get pointer to buffer */
    p = *buf;

    /* Decode type id */
    type_id = *p++;

    /* Decode flags */
    flags = *p++;
    if(flags & H5C__MDCI_ENTRY_DIRTY_FLAG)
        is_dirty = TRUE;
    if(flags & H5C__MDCI_ENTRY_IN_LRU_FLAG)
        in_lru = TRUE;
    if(flags & H5C__MDCI_ENTRY_IS_FD_PARENT_FLAG)
        is_fd_parent = TRUE;
    if(flags & H5C__MDCI_ENTRY_IS_FD_CHILD_FLAG)
        is_fd_child = TRUE;

    /* Decode ring */
    ring = *p++;
    HDassert(ring > (uint8_t)(H5C_RING_UNDEFINED));
    HDassert(ring < (uint8_t)(H5C_RING_NTYPES));

    /* Decode age */
    age = *p++;

    /* Decode dependency child count */
    UINT16DECODE(p, fd_child_count);
    HDassert((is_fd_parent && fd_child_count > 0) || (!is_fd_parent && fd_child_count == 0));

    /* Decode dirty dependency child count */
    UINT16DECODE(p, fd_dirty_child_count);
    if(fd_dirty_child_count > fd_child_count)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "invalid dirty flush dependency child count")

    /* Decode dependency parent count */
    UINT16DECODE(p, fd_parent_count);
    HDassert((is_fd_child && fd_parent_count > 0) || (!is_fd_child && fd_parent_count == 0));

    /* Decode index in LRU */
    INT32DECODE(p, lru_rank);
    HDassert((in_lru && lru_rank >= 0) || (!in_lru && lru_rank == -1));

    /* Decode entry offset */
    H5F_addr_decode(f, &p, &addr);
    if(!H5F_addr_defined(addr))
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "invalid entry offset")

    /* Decode entry length */
    H5F_DECODE_LENGTH(f, p, size);
    if(size == 0)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "invalid entry size")

    /* Verify expected length of entry image */
    if((size_t)(p - *buf) != H5C__cache_image_block_entry_header_size(f))
        HGOTO_ERROR(H5E_CACHE, H5E_BADSIZE, FAIL, "Bad entry image len")
    
    /* If parent count greater than zero, allocate array for parent 
     * addresses, and decode addresses into the array.
     */
    if(fd_parent_count > 0) {
        int i;          /* Local index variable */

        if(NULL == (fd_parent_addrs = (haddr_t *)H5MM_malloc((size_t)(fd_parent_count) * H5F_SIZEOF_ADDR(f))))
	    HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for fd parent addrs buffer")

	for(i = 0; i < fd_parent_count; i++) {
            H5F_addr_decode(f, &p, &(fd_parent_addrs[i]));
            if(!H5F_addr_defined(fd_parent_addrs[i]))
                HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "invalid flush dependency parent offset")
        } /* end for */
    } /* end if */

    /* Allocate buffer for entry image */
    if(NULL == (image_ptr = H5MM_malloc(size + H5C_IMAGE_EXTRA_SPACE)))
	HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for on disk image buffer")

#if H5C_DO_MEMORY_SANITY_CHECKS
    HDmemcpy(((uint8_t *)image_ptr) + size, H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

    /* Copy the entry image from the cache image block */
    HDmemcpy(image_ptr, p, size);
    p += size;

    /* Copy data into target */
    ie_ptr->addr                 = addr;
    ie_ptr->size                 = size;
    ie_ptr->ring                 = (H5C_ring_t)ring;
    ie_ptr->age                  = (int32_t)age;
    ie_ptr->type_id              = (int32_t)type_id;
    ie_ptr->lru_rank             = lru_rank;
    ie_ptr->is_dirty             = is_dirty;
    ie_ptr->fd_child_count       = (uint64_t)fd_child_count;
    ie_ptr->fd_dirty_child_count = (uint64_t)fd_dirty_child_count;
    ie_ptr->fd_parent_count      = (uint64_t)fd_parent_count;
    ie_ptr->fd_parent_addrs      = fd_parent_addrs;
    ie_ptr->image_ptr            = image_ptr;

    /* Update buffer pointer */
    *buf = p;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__decode_cache_image_entry() */
#endif /* NDEBUG */


/*-------------------------------------------------------------------------
 * Function:    H5C__destroy_pf_entry_child_flush_deps()
 *
 * Purpose:     Destroy all flush dependencies in this the supplied 
 *		prefetched entry is the parent.  Note that the children
 *		in these flush dependencies must be prefetched entries as 
 *		well.
 *
 *		As this action is part of the process of transferring all
 *		such flush dependencies to the deserialized version of the
 *		prefetched entry, ensure that the data necessary to complete
 *		the transfer is retained.
 *
 *		Note: The current implementation of this function is 
 *		      quite inefficient -- mostly due to the current 
 *		      implementation of flush dependencies.  This should
 *		      be fixed at some point.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/11/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__destroy_pf_entry_child_flush_deps(H5C_t *cache_ptr, 
    H5C_cache_entry_t *pf_entry_ptr, H5C_cache_entry_t **fd_children)
{
    H5C_cache_entry_t * entry_ptr;
    unsigned		entries_visited = 0;
    int			fd_children_found = 0;
    hbool_t		found;
    herr_t		ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(pf_entry_ptr);
    HDassert(pf_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
    HDassert(pf_entry_ptr->type);
    HDassert(pf_entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID);
    HDassert(pf_entry_ptr->prefetched);
    HDassert(pf_entry_ptr->fd_child_count > 0);
    HDassert(fd_children);

    /* Scan each entry on the index list */
    entry_ptr = cache_ptr->il_head;
    while(entry_ptr != NULL) {
	HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);

	/* Here we look at entry_ptr->flush_dep_nparents and not 
         * entry_ptr->fd_parent_count as it is possible that some 
	 * or all of the prefetched flush dependency child relationships
	 * have already been destroyed.
         */
	if(entry_ptr->prefetched && (entry_ptr->flush_dep_nparents > 0)) {
            unsigned u;         /* Local index variable */

            /* Re-init */
	    u = 0;
	    found = FALSE;

            /* Sanity checks */
            HDassert(entry_ptr->type);
            HDassert(entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID);
	    HDassert(entry_ptr->fd_parent_count >= entry_ptr->flush_dep_nparents);
	    HDassert(entry_ptr->fd_parent_addrs);
	    HDassert(entry_ptr->flush_dep_parent);

            /* Look for correct entry */
	    while(!found && (u < entry_ptr->fd_parent_count)) {
                /* Sanity check entry */
		HDassert(entry_ptr->flush_dep_parent[u]);
		HDassert(entry_ptr->flush_dep_parent[u]->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);

                /* Correct entry? */
		if(pf_entry_ptr == entry_ptr->flush_dep_parent[u])
		    found = TRUE;

		u++;
            } /* end while */

	    if(found) {
	        HDassert(NULL == fd_children[fd_children_found]);

                /* Remove flush dependency */
	        fd_children[fd_children_found] = entry_ptr;
	        fd_children_found++;
                if(H5C_destroy_flush_dependency(pf_entry_ptr, entry_ptr) < 0)
	            HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL, "can't destroy pf entry child flush dependency")

#ifndef NDEBUG
		/* Sanity check -- verify that the address of the parent 
                 * appears in entry_ptr->fd_parent_addrs.  Must do a search,
                 * as with flush dependency creates and destroys, 
                 * entry_ptr->fd_parent_addrs and entry_ptr->flush_dep_parent
                 * can list parents in different order.
                 */
		found = FALSE;
		u = 0;
	        while(!found && u < entry_ptr->fd_parent_count) {
		    if(pf_entry_ptr->addr == entry_ptr->fd_parent_addrs[u])
		        found = TRUE;
		    u++;
                } /* end while */
		HDassert(found);
#endif /* NDEBUG */
	    } /* end if */
	} /* end if */

        entries_visited++;
        entry_ptr = entry_ptr->il_next;
    } /* end while */

    /* Post-op sanity checks */
    HDassert(NULL == fd_children[fd_children_found]);
    HDassert((unsigned)fd_children_found == pf_entry_ptr->fd_child_count);
    HDassert(entries_visited == cache_ptr->index_len);
    HDassert(!pf_entry_ptr->is_pinned);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__destroy_pf_entry_child_flush_deps() */


/*-------------------------------------------------------------------------
 * Function:    H5C__encode_cache_image_header()
 *
 * Purpose:     Encode the metadata cache image buffer header in the 
 *		supplied buffer.  Updates buffer pointer to the first byte 
 *		after the header image in the buffer, or unchanged on failure.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/6/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__encode_cache_image_header(const H5F_t *f, const H5C_t *cache_ptr,
    uint8_t **buf)
{
    size_t 	actual_header_len;
    size_t	expected_header_len;
    uint8_t     flags = 0;
    uint8_t *	p;                      /* Pointer into cache image buffer */
    herr_t	ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->close_warning_received);
    HDassert(cache_ptr->image_ctl.generate_image);
    HDassert(cache_ptr->index_len == 0);
    HDassert(cache_ptr->image_data_len > 0);
    HDassert(cache_ptr->image_data_len <= cache_ptr->image_len);
    HDassert(buf);
    HDassert(*buf);

    /* Set pointer into buffer */
    p = *buf;

    /* write signature */
    HDmemcpy(p, H5C__MDCI_BLOCK_SIGNATURE, (size_t)H5C__MDCI_BLOCK_SIGNATURE_LEN);
    p += H5C__MDCI_BLOCK_SIGNATURE_LEN;

    /* write version */
    *p++ = (uint8_t)H5C__MDCI_BLOCK_VERSION_0;

    /* setup and write flags */

    /* at present we don't support saving resize status */
    HDassert(!cache_ptr->image_ctl.save_resize_status);
    if(cache_ptr->image_ctl.save_resize_status)
	flags |= H5C__MDCI_HEADER_HAVE_RESIZE_STATUS;

    *p++ = flags;

    /* Encode image data length */
    /* this must be true at present */
    HDassert(cache_ptr->image_len == cache_ptr->image_data_len);
    H5F_ENCODE_LENGTH(f, p, cache_ptr->image_data_len);

    /* write num entries */
    UINT32ENCODE(p, cache_ptr->num_entries_in_image);

    /* verify expected length of header */
    actual_header_len = (size_t)(p - *buf);
    expected_header_len = H5C__cache_image_block_header_size(f);
    if(actual_header_len != expected_header_len)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad header image len")

    /* Update buffer pointer */
    *buf = p;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__encode_cache_image_header() */


/*-------------------------------------------------------------------------
 * Function:    H5C__encode_cache_image_entry()
 *
 * Purpose:     Encode the metadata cache image buffer header in the 
 *		supplied buffer.  Updates buffer pointer to the first byte 
 *		after the entry in the buffer, or unchanged on failure.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/6/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__encode_cache_image_entry(H5F_t *f, H5C_t *cache_ptr, uint8_t **buf, 
    unsigned entry_num)
{
    H5C_image_entry_t *	ie_ptr;                 /* Pointer to entry to encode */
    uint8_t             flags = 0;              /* Flags for entry */
    uint8_t           *	p;                      /* Pointer into cache image buffer */
    unsigned            u;                      /* Local index value */
    herr_t		ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(cache_ptr == f->shared->cache);
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->close_warning_received);
    HDassert(cache_ptr->image_ctl.generate_image);
    HDassert(cache_ptr->index_len == 0);
    HDassert(buf);
    HDassert(*buf);
    HDassert(entry_num < cache_ptr->num_entries_in_image);
    ie_ptr = &((cache_ptr->image_entries)[entry_num]);
    HDassert(ie_ptr->magic == H5C_IMAGE_ENTRY_T_MAGIC);

    /* Get pointer to buffer to encode into */
    p = *buf;

    /* Encode type */
    if((ie_ptr->type_id < 0) || (ie_ptr->type_id > 255))
        HGOTO_ERROR(H5E_CACHE, H5E_BADRANGE, FAIL, "type_id out of range.")
    *p++ = (uint8_t)(ie_ptr->type_id);

    /* Compose and encode flags */
    if(ie_ptr->is_dirty) 
	flags |= H5C__MDCI_ENTRY_DIRTY_FLAG;
    if(ie_ptr->lru_rank > 0) 
	flags |= H5C__MDCI_ENTRY_IN_LRU_FLAG;
    if(ie_ptr->fd_child_count > 0)
	flags |= H5C__MDCI_ENTRY_IS_FD_PARENT_FLAG;
    if(ie_ptr->fd_parent_count > 0) 
	flags |= H5C__MDCI_ENTRY_IS_FD_CHILD_FLAG;
    *p++ = flags;

    /* Encode ring */
    *p++ = (uint8_t)(ie_ptr->ring);

    /* Encode age */
    *p++ = (uint8_t)(ie_ptr->age);

    /* Validate and encode dependency child count */
    if(ie_ptr->fd_child_count > H5C__MDCI_MAX_FD_CHILDREN)
        HGOTO_ERROR(H5E_CACHE, H5E_BADRANGE, FAIL, "fd_child_count out of range")
    UINT16ENCODE(p, (uint16_t)(ie_ptr->fd_child_count));

    /* Validate and encode dirty dependency child count */
    if(ie_ptr->fd_dirty_child_count > H5C__MDCI_MAX_FD_CHILDREN)
        HGOTO_ERROR(H5E_CACHE, H5E_BADRANGE, FAIL, "fd_dirty_child_count out of range")
    UINT16ENCODE(p, (uint16_t)(ie_ptr->fd_dirty_child_count));

    /* Validate and encode dependency parent count */
    if(ie_ptr->fd_parent_count > H5C__MDCI_MAX_FD_PARENTS)
        HGOTO_ERROR(H5E_CACHE, H5E_BADRANGE, FAIL, "fd_parent_count out of range")
    UINT16ENCODE(p, (uint16_t)(ie_ptr->fd_parent_count));

    /* Encode index in LRU */
    INT32ENCODE(p, ie_ptr->lru_rank);

    /* Encode entry offset */
    H5F_addr_encode(f, &p, ie_ptr->addr);

    /* Encode entry length */
    H5F_ENCODE_LENGTH(f, p, ie_ptr->size);

    /* Verify expected length of entry image */
    if((size_t)(p - *buf) != H5C__cache_image_block_entry_header_size(f))
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "Bad entry image len")

    /* Encode dependency parent offsets -- if any */
    for(u = 0; u < ie_ptr->fd_parent_count; u++)
	H5F_addr_encode(f, &p, ie_ptr->fd_parent_addrs[u]);

    /* Copy entry image */
    HDmemcpy(p, ie_ptr->image_ptr, ie_ptr->size);
    p += ie_ptr->size;

    /* Update buffer pointer */
    *buf = p;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__encode_cache_image_entry() */


/*-------------------------------------------------------------------------
 * Function:    H5C__prep_for_file_close__compute_fd_heights
 *
 * Purpose:     Recent modifications to flush dependency support in the
 *		metadata cache have removed the notion of flush dependency
 *		height.  This is a problem for the cache image feature,
 *		as flush dependency height is used to order entries in the
 *		cache image so that flush dependency parents appear before
 *		flush dependency children. (Recall that the flush dependency
 *		height of an entry in a flush dependency relationship is the
 *		length of the longest path from the entry to a leaf entry --
 *		that is an entry with flush dependency parents, but no 
 *		flush dependency children.  With the introduction of the 
 *		possibility of multiple flush dependency parents, we have
 *		a flush partial dependency latice, not a flush dependency 
 *		tree.  But since the partial latice is acyclic, the concept 
 *		of flush dependency height still makes sense.
 *
 *		The purpose of this function is to compute the flush 
 *		dependency height of all entries that appear in the cache
 *		image.  
 *
 *		At present, entries are included or excluded from the 
 *		cache image depending upon the ring in which they reside.
 *		Thus there is no chance that one side of a flush dependency
 *		will be in the cache image, and the other side not.
 *
 *		However, once we start placing a limit on the size of the
 *		cache image, or start excluding prefetched entries from
 *		the cache image if they haven't been accessed in some 
 *		number of file close / open cycles, this will no longer 
 *		be the case.  
 *
 *		In particular, if a flush dependency child is dirty, and
 *		one of its flush dependency parents is dirty and not in
 *		the cache image, then the flush dependency child cannot
 *		be in the cache image without violating flush ordering.
 *
 *		Observe that a clean flush dependency child can be either 
 *		in or out of the cache image without effect on flush 
 *		dependencies.
 *
 *		Similarly, a flush dependency parent can always be part 
 *		of a cache image, regardless of whether it is clean or 
 *		dirty -- but remember that a flush dependency parent can
 *		also be a flush dependency child.
 *		
 *		Finally, note that for purposes of the cache image, flush
 *		dependency height ends when a flush dependecy relation 
 *		passes off the cache image.
 *
 *		On exit, the flush dependency height of each entry in the 
 *		cache image should be calculated and stored in the cache
 *		entry.  Entries will be removed from the cache image if
 *		necessary to maintain flush ordering.
 *		
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              9/6/16
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__prep_for_file_close__compute_fd_heights(const H5C_t *cache_ptr)
{
    H5C_cache_entry_t * entry_ptr;
    H5C_cache_entry_t * parent_ptr;
    unsigned		entries_removed_from_image = 0;
    unsigned		external_parent_fd_refs_removed = 0;
    unsigned		external_child_fd_refs_removed = 0;
    hbool_t 		done = FALSE;
    unsigned		u;              /* Local index variable */
    herr_t              ret_value = SUCCEED;

    FUNC_ENTER_STATIC

    /* sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);

    /* Remove from the cache image all dirty entries that are 
     * flush dependency children of dirty entries that are not in the
     * cache image.  Must do this, as if we fail to do so, the parent 
     * will be written to file before the child.  Since it is possible 
     * that the child will have dirty children of its own, this may take
     * multiple passes through the index list.
     */
    done = FALSE;
    while(!done) {
	done = TRUE;
	entry_ptr = cache_ptr->il_head;
        while(entry_ptr != NULL) {
	    HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);

            /* Should this entry be in the image */
	    if(entry_ptr->image_dirty && entry_ptr->include_in_image &&
                    (entry_ptr->fd_parent_count > 0)) {
		HDassert(entry_ptr->flush_dep_parent != NULL);
		for(u = 0; u < entry_ptr->flush_dep_nparents; u++ ) {
		    parent_ptr = entry_ptr->flush_dep_parent[u];

                    /* Sanity check parent */
		    HDassert(parent_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
		    HDassert(entry_ptr->ring == parent_ptr->ring);

		    if(parent_ptr->is_dirty && !parent_ptr->include_in_image &&
                             entry_ptr->include_in_image) {

			/* Must remove child from image -- only do this once */
			entries_removed_from_image++;
			entry_ptr->include_in_image = FALSE;
		    } /* end if */
		} /* for */
            } /* end if */

	    entry_ptr = entry_ptr->il_next;
        } /* while ( entry_ptr != NULL ) */
    } /* while ( ! done ) */ 

    /* at present, entries are included in the cache image if they reside
     * in a specified set of rings.  Thus it should be impossible for 
     * entries_removed_from_image to be positive.  Assert that this is 
     * so.  Note that this will change when we start aging entries out 
     * of the cache image.
     */
    HDassert(entries_removed_from_image == 0);

    /* Next, remove from entries in the cache image, references to 
     * flush dependency parents or children that are not in the cache image.
     */
    entry_ptr = cache_ptr->il_head;
    while(entry_ptr != NULL) {
	if(!entry_ptr->include_in_image && entry_ptr->flush_dep_nparents > 0) {
	    HDassert(entry_ptr->flush_dep_parent != NULL);

	    for(u = 0; u < entry_ptr->flush_dep_nparents; u++ ) {
	        parent_ptr = entry_ptr->flush_dep_parent[u];

                /* Sanity check parent */
		HDassert(parent_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
		HDassert(entry_ptr->ring == parent_ptr->ring);

		if(parent_ptr->include_in_image) {
		    /* Must remove reference to child */
		    HDassert(parent_ptr->fd_child_count > 0);
		    parent_ptr->fd_child_count--;

		    if(entry_ptr->is_dirty) {
			HDassert(parent_ptr->fd_dirty_child_count > 0);
			parent_ptr->fd_dirty_child_count--;
		    } /* end if */

		    external_child_fd_refs_removed++;
		} /* end if */
	    } /* for */
	} /* end if */
        else if(entry_ptr->include_in_image && entry_ptr->flush_dep_nparents > 0) {
            /* Sanity checks */
	    HDassert(entry_ptr->flush_dep_parent != NULL);
	    HDassert(entry_ptr->flush_dep_nparents == entry_ptr->fd_parent_count);
	    HDassert(entry_ptr->fd_parent_addrs);

	    for(u = 0; u < entry_ptr->flush_dep_nparents; u++ ) {
	        parent_ptr = entry_ptr->flush_dep_parent[u];

                /* Sanity check parent */
		HDassert(parent_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
		HDassert(entry_ptr->ring == parent_ptr->ring);

		if(!parent_ptr->include_in_image) {
		    /* Must remove reference to parent */
		    HDassert(entry_ptr->fd_parent_count > 0);
		    parent_ptr->fd_child_count--;

		    HDassert(parent_ptr->addr == entry_ptr->fd_parent_addrs[u]);

		    entry_ptr->fd_parent_addrs[u] = HADDR_UNDEF;
		    external_parent_fd_refs_removed++;
		} /* end if */
	    } /* for */

	    /* Touch up fd_parent_addrs array if necessary */
	    if(entry_ptr->fd_parent_count == 0) {
		H5MM_xfree(entry_ptr->fd_parent_addrs);
		entry_ptr->fd_parent_addrs = NULL;
	    } /* end if */
            else if(entry_ptr->flush_dep_nparents > entry_ptr->fd_parent_count) {
		haddr_t * old_fd_parent_addrs = entry_ptr->fd_parent_addrs;
                unsigned v;

		if(NULL == (entry_ptr->fd_parent_addrs = (haddr_t *)H5MM_calloc(sizeof(haddr_t) * (size_t)(entry_ptr->fd_parent_addrs))))
		    HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for fd parent addr array")

		v = 0;
	        for(u = 0; u < entry_ptr->flush_dep_nparents; u++) {
		    if(old_fd_parent_addrs[u] != HADDR_UNDEF) {
			entry_ptr->fd_parent_addrs[v] = old_fd_parent_addrs[u];
			v++;
		    } /* end if */
		} /* end for */

		HDassert(v == entry_ptr->fd_parent_count);
	    } /* end else-if */
	} /* end else-if */

        entry_ptr = entry_ptr->il_next;
    } /* while (entry_ptr != NULL) */

    /* At present, no extenal parent or child flush dependency links 
     * should exist -- hence the following assertions.  This will change
     * if we support ageout of entries in the cache image.
     */
    HDassert(external_child_fd_refs_removed == 0);
    HDassert(external_parent_fd_refs_removed == 0);

    /* At this point we should have removed all flush dependencies that 
     * cross cache image boundaries.  Now compute the flush dependency
     * heights for all entries in the image.
     *
     * Until I can think of a better way, do this via a depth first
     * search implemented via a recursive function call.
     *
     * Note that entry_ptr->image_fd_height has already been initialized to 0
     * for all entries that may appear in the cache image.
     */
    entry_ptr = cache_ptr->il_head;
    while(entry_ptr != NULL) {
	if(entry_ptr->include_in_image && entry_ptr->fd_child_count == 0 &&
                entry_ptr->fd_parent_count > 0) {
	    for(u = 0; u < entry_ptr->fd_parent_count; u++) {
	        parent_ptr = entry_ptr->flush_dep_parent[u];

	        HDassert(parent_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
	        if(parent_ptr->include_in_image && parent_ptr->image_fd_height <= 0) 
		    H5C__prep_for_file_close__compute_fd_heights_real(parent_ptr, 1);
	    } /* end for */
        } /* end if */

        entry_ptr = entry_ptr->il_next;
    } /* while (entry_ptr != NULL) */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__prep_for_file_close__compute_fd_heights() */


/*-------------------------------------------------------------------------
 * Function:    H5C__prep_for_file_close__compute_fd_heights_real
 *
 * Purpose:     H5C__prep_for_file_close__compute_fd_heights() prepares
 *		for the computation of flush dependency heights of all
 *		entries in the cache image, this function actually does
 *		it.
 *
 *		The basic observation behind this function is as follows:
 *
 *		Suppose you have an entry E with a flush dependency 
 *		height of X.  Then the parents of E must all have 
 *		flush dependency X + 1 or greater.
 *
 *		Use this observation to compute flush dependency height
 *		of all entries in the cache image via the following
 *		recursive algorithm:
 *
 *		1) On entry, set the flush dependency height of the 
 *		   supplied cache entry to the supplied value.
 *
 *		2) Examine all the flush dependency parents of the 
 *		   supplied entry.  
 *
 *		   If the parent is in the cache image, and has flush 
 *		   dependency height less than or equal to the flush
 *		   dependency height of the current entry, call the 
 *		   recursive routine on the parent with flush dependency
 *		   height equal to the flush dependency height of the 
 *		   child plus 1.
 *
 *		   Otherwise do nothing.
 *
 *		Observe that if the flush dependency height of all entries
 *		in the image is initialized to zero, and if this recursive 
 *		function is called with flush dependency height 0 on all 
 *		entries in the cache image with FD parents in the image, 
 *		but without FD children in the image, the correct flush 
 *		dependency height should be set for all entries in the 
 *		cache image.
 *		
 * Return:      void
 *
 * Programmer:  John Mainzer
 *              9/6/16
 *
 *-------------------------------------------------------------------------
 */
static void
H5C__prep_for_file_close__compute_fd_heights_real(H5C_cache_entry_t  *entry_ptr,
    uint32_t fd_height)
{
    FUNC_ENTER_STATIC_NOERR

    /* Sanity checks */
    HDassert(entry_ptr);
    HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
    HDassert(entry_ptr->include_in_image);
    HDassert((entry_ptr->image_fd_height == 0) || (entry_ptr->image_fd_height < fd_height));
    HDassert(((fd_height == 0) && (entry_ptr->fd_child_count == 0)) || ((fd_height > 0) && (entry_ptr->fd_child_count > 0)));

    entry_ptr->image_fd_height = fd_height;
    if(entry_ptr->flush_dep_nparents > 0) {
        unsigned u;

	HDassert(entry_ptr->flush_dep_parent);
	for(u = 0; u < entry_ptr->fd_parent_count; u++) {
            H5C_cache_entry_t *parent_ptr;

	    parent_ptr = entry_ptr->flush_dep_parent[u];
	    HDassert(parent_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);

	    if(parent_ptr->include_in_image && parent_ptr->image_fd_height <= fd_height)
		H5C__prep_for_file_close__compute_fd_heights_real(parent_ptr, fd_height + 1);
        } /* end for */
    } /* end if */

    FUNC_LEAVE_NOAPI_VOID
} /* H5C__prep_for_file_close__compute_fd_heights_real() */


/*-------------------------------------------------------------------------
 * Function:    H5C__prep_for_file_close__setup_image_entries_array
 *
 * Purpose:     Allocate space for the image_entries array, and load
 *		each instance of H5C_image_entry_t in the array with 
 *		the data necessary to construct the metadata cache image.
 *		
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/4/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__prep_for_file_close__setup_image_entries_array(H5C_t *cache_ptr)
{
    H5C_cache_entry_t * entry_ptr;
    H5C_image_entry_t * image_entries = NULL;
    uint32_t		entries_visited = 0;
    unsigned            u;                      /* Local index variable */
    herr_t		ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->close_warning_received);
    HDassert(cache_ptr->pl_len == 0);
    HDassert(cache_ptr->num_entries_in_image > 0);
    HDassert(cache_ptr->image_entries == NULL);

    /* Allocate and initialize image_entries array */
    if(NULL == (image_entries = (H5C_image_entry_t *)H5MM_calloc(sizeof(H5C_image_entry_t) * (size_t)(cache_ptr->num_entries_in_image + 1))))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for image_entries")

    /* Initialize (non-zero/NULL/FALSE) fields */
    for(u = 0; u <= cache_ptr->num_entries_in_image; u++) {
	image_entries[u].magic                = H5C_IMAGE_ENTRY_T_MAGIC;
	image_entries[u].addr                 = HADDR_UNDEF;
        image_entries[u].ring		      = H5C_RING_UNDEFINED;
	image_entries[u].type_id              = -1;
    } /* end for */

    /* Scan each entry on the index list and populate the image_entries array */
    u = 0;
    entry_ptr = cache_ptr->il_head;
    while(entry_ptr != NULL) {
	HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);

        if(entry_ptr->include_in_image) {
	    /* Since we have already serialized the cache, the following
             * should hold.
             */
            HDassert(entry_ptr->image_up_to_date);
            HDassert(entry_ptr->image_ptr);
	    HDassert(entry_ptr->type);

	    image_entries[u].addr                 = entry_ptr->addr;
	    image_entries[u].size                 = entry_ptr->size;
	    image_entries[u].ring                 = entry_ptr->ring;

	    /* When a prefetched entry is included in the image, store
             * its underlying type id in the image entry, not 
             * H5AC_PREFETCHED_ENTRY_ID.  In passing, also increment
	     * the age (up to H5AC__CACHE_IMAGE__ENTRY_AGEOUT__MAX).
             */
	    if(entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID) {
		image_entries[u].type_id          = entry_ptr->prefetch_type_id;
		image_entries[u].age              = entry_ptr->age + 1;
		
		if(image_entries[u].age > H5AC__CACHE_IMAGE__ENTRY_AGEOUT__MAX)
		    image_entries[u].age = H5AC__CACHE_IMAGE__ENTRY_AGEOUT__MAX;
	    } /* end if */
            else {
                image_entries[u].type_id          = entry_ptr->type->id;
		image_entries[u].age              = 0;
	    } /* end else */

	    image_entries[u].lru_rank             = entry_ptr->lru_rank;
	    image_entries[u].is_dirty             = entry_ptr->is_dirty;
	    image_entries[u].image_fd_height      = entry_ptr->image_fd_height;
	    image_entries[u].fd_parent_count      = entry_ptr->fd_parent_count;
	    image_entries[u].fd_parent_addrs      = entry_ptr->fd_parent_addrs;
	    image_entries[u].fd_child_count       = entry_ptr->fd_child_count;
	    image_entries[u].fd_dirty_child_count = 
						entry_ptr->fd_dirty_child_count;
	    image_entries[u].image_ptr            = entry_ptr->image_ptr;

	    /* Null out entry_ptr->fd_parent_addrs and set 
             * entry_ptr->fd_parent_count to zero so that ownership of the
             * flush dependency parents address array is transferred to the 
	     * image entry.
             */
	    entry_ptr->fd_parent_count = 0;
	    entry_ptr->fd_parent_addrs = NULL;

            u++;

	    HDassert(u <= cache_ptr->num_entries_in_image);
        } /* end if */

        entries_visited++;

        entry_ptr = entry_ptr->il_next;
    } /* end while */

    /* Sanity checks */
    HDassert(entries_visited == cache_ptr->index_len);
    HDassert(u == cache_ptr->num_entries_in_image);

    HDassert(image_entries[u].fd_parent_addrs == NULL);
    HDassert(image_entries[u].image_ptr == NULL);

    cache_ptr->image_entries = image_entries;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__prep_for_file_close__setup_image_entries_array() */


/*-------------------------------------------------------------------------
 * Function:    H5C__prep_for_file_close__scan_entries
 *
 * Purpose:     Scan all entries in the metadata cache, and store all 
 *		entry specific data required for construction of the 
 *		metadata cache image block and likely to be discarded
 *		or modified during the cache flush on file close.
 *
 *		In particular, make note of:
 *			entry rank in LRU
 *			whether the entry is dirty
 *			base address of entry flush dependency parent,
 *			        if it exists.
 *			number of flush dependency children, if any.
 *
 *		Also, determine which entries are to be included in the
 *		metadata cache image.  At present, all entries other than
 *		the superblock, the superblock extension object header and
 *		its associated chunks (if any) are included.
 *
 *		Finally, compute the size of the metadata cache image
 *		block.
 *		
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              7/21/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__prep_for_file_close__scan_entries(const H5F_t *f, H5C_t *cache_ptr)
{
    H5C_cache_entry_t * entry_ptr;
    hbool_t		include_in_image;
    unsigned		entries_visited = 0;
    int			lru_rank = 1;
    uint32_t		num_entries_tentatively_in_image = 0;
    uint32_t		num_entries_in_image = 0;
    size_t		image_len;
    size_t		entry_header_len;
    size_t		fd_parents_list_len;
    int			i;
    unsigned            j;
    herr_t		ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->sblock);
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->close_warning_received);
    HDassert(cache_ptr->pl_len == 0);

    /* Initialize image len to the size of the metadata cache image block
     * header.
     */
    image_len        = H5C__cache_image_block_header_size(f);
    entry_header_len = H5C__cache_image_block_entry_header_size(f);

    /* Scan each entry on the index list */
    entry_ptr = cache_ptr->il_head;
    while(entry_ptr != NULL) {
	HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);

	/* Since we have already serialized the cache, the following
         * should hold.
         */
        HDassert(entry_ptr->image_up_to_date);
        HDassert(entry_ptr->image_ptr);

	/* Initially, we mark all entries in the rings included
         * in the cache image as being included in the in the 
         * image.  Depending on circumstances, we may exclude some
         * of these entries later.
         */
	if(entry_ptr->ring > H5C_MAX_RING_IN_IMAGE)
	    include_in_image = FALSE;
        else
	    include_in_image = TRUE;
        entry_ptr->include_in_image = include_in_image;

        if(include_in_image) {
	    entry_ptr->lru_rank = -1;
            entry_ptr->image_dirty = entry_ptr->is_dirty;
	    entry_ptr->image_fd_height = 0;     /* will compute this later */

	    /* Initially, include all flush dependency parents in the
             * the list of flush dependencies to be stored in the 
             * image.  We may remove some or all of these later.
             */
	    if(entry_ptr->flush_dep_nparents > 0) {
	        /* The parents addresses array may already exist -- reallocate
                 * as needed.
                 */
		if(entry_ptr->flush_dep_nparents == entry_ptr->fd_parent_count ) {
		    /* parent addresses array should already be allocated 
                     * and of the correct size.
                     */
		    HDassert(entry_ptr->fd_parent_addrs);
		} /* end if */
                else if(entry_ptr->fd_parent_count > 0) {
		    HDassert(entry_ptr->fd_parent_addrs);
                    entry_ptr->fd_parent_addrs = (haddr_t *)H5MM_xfree(entry_ptr->fd_parent_addrs);
		} /* end else-if */
                else {
		    HDassert(entry_ptr->fd_parent_count == 0);
		    HDassert(entry_ptr->fd_parent_addrs == NULL);
		} /* end else */

		entry_ptr->fd_parent_count = entry_ptr->flush_dep_nparents;
		if(NULL == entry_ptr->fd_parent_addrs)
		    if(NULL == (entry_ptr->fd_parent_addrs = (haddr_t *)H5MM_malloc(sizeof(haddr_t) * (size_t)(entry_ptr->fd_parent_count))))
        	        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, FAIL, "memory allocation failed for fd parent addrs buffer")

		for(i = 0; i < (int)(entry_ptr->fd_parent_count); i++) {
		    entry_ptr->fd_parent_addrs[i] = entry_ptr->flush_dep_parent[i]->addr;
		    HDassert(H5F_addr_defined(entry_ptr->fd_parent_addrs[i]));
		} /* end for */
            } /* end if */
            else if(entry_ptr->fd_parent_count > 0) {
		HDassert(entry_ptr->fd_parent_addrs);
		entry_ptr->fd_parent_addrs = (haddr_t *)H5MM_xfree(entry_ptr->fd_parent_addrs);
	    } /* end else-if */
            else
		HDassert(entry_ptr->fd_parent_addrs == NULL);

	    /* Initially, all flush dependency children are included int
             * the count of flush dependency child relationships to be 
             * represented in the cache image.  Some or all of these 
             * may be dropped from the image later.
             */
	    if(entry_ptr->flush_dep_nchildren > 0) {
		if(!entry_ptr->is_pinned)
                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "encountered unpinned fd parent?!?")

		entry_ptr->fd_child_count = entry_ptr->flush_dep_nchildren;
		entry_ptr->fd_dirty_child_count = entry_ptr->flush_dep_ndirty_children;
	    } /* end if */

	    num_entries_tentatively_in_image++;
        } /* end if */

        entries_visited++;
        entry_ptr = entry_ptr->il_next;
    } /* end while */
    HDassert(entries_visited == cache_ptr->index_len);

    /* Now compute the flush dependency heights of all flush dependency
     * relationships to be represented in the image.
     *
     * If all entries in the target rings are included in the 
     * image, the flush dependency heights are simply the heights 
     * of all flush dependencies in the target rings.
     *
     * However, if we restrict appearance in the cache image either 
     * by number of entries in the image, restrictions on the number 
     * of times a prefetched entry can appear in an image, or image 
     * size, it is possible that flush dependency parents or children
     * of entries that are in the image may not be included in the
     * the image.  In this case, we must prune all flush dependency 
     * relationships that cross the image boundary, and all exclude 
     * from the image all dirty flush dependency children that have 
     * a dirty flush dependency parent that is not in the image. 
     * This is necessary to preserve the required flush ordering.
     * 
     * These details are tended to by the following call to 
     * H5C__prep_for_file_close__compute_fd_heights().  Because the 
     * exact contents of the image cannot be known until after this
     * call, computation of the image size is delayed.
     */
    if(H5C__prep_for_file_close__compute_fd_heights(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "computation of flush dependency heights failed?!?")

    /* At this point, all entries that will appear in the cache
     * image should be marked correctly.  Compute the size of the 
     * cache image.
     */
    entries_visited = 0;
    entry_ptr = cache_ptr->il_head;
    while(entry_ptr != NULL) {
        HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);

        if(entry_ptr->include_in_image) {
            if(entry_ptr->fd_parent_count > 0)
                fd_parents_list_len = (size_t)(H5F_SIZEOF_ADDR(f) * entry_ptr->fd_parent_count);
            else
                fd_parents_list_len = (size_t)0;

            image_len += entry_header_len + fd_parents_list_len + entry_ptr->size;
            num_entries_in_image++;
        } /* end if */

        entries_visited++;
        entry_ptr = entry_ptr->il_next;
    } /* end while */
    HDassert(entries_visited == cache_ptr->index_len);
    HDassert(num_entries_in_image <= num_entries_tentatively_in_image);

    j = 0;
    for(i = H5C_MAX_RING_IN_IMAGE + 1; i <= H5C_RING_SB; i++)
        j += cache_ptr->index_ring_len[i];

    /* This will change */
    HDassert(entries_visited == (num_entries_tentatively_in_image + j));

    cache_ptr->num_entries_in_image = num_entries_in_image;
    entries_visited = 0;

    /* Now scan the LRU list to set the lru_rank fields of all entries
     * on the LRU.
     *
     * Note that we start with rank 1, and increment by 1 with each 
     * entry on the LRU.  
     *
     * Note that manually pinned entryies will have lru_rank -1,
     * and no flush dependency.  Putting these entries at the head of 
     * the reconstructed LRU should be appropriate.
     */
    entry_ptr = cache_ptr->LRU_head_ptr;
    while(entry_ptr != NULL) {
	HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
        HDassert(entry_ptr->type != NULL);

        /* to avoid confusion, don't set lru_rank on epoch markers.
         * Note that we still increment the lru_rank, so that the holes
         * in the sequence of entries on the LRU will indicate the 
         * locations of epoch markers (if any) when we reconstruct 
         * the LRU.
         *
         * Do not set lru_rank or increment lru_rank for entries 
         * that will not be included in the cache image.
         */
	if(entry_ptr->type->id == H5AC_EPOCH_MARKER_ID)
	    lru_rank++;
	else if(entry_ptr->include_in_image) {
	    entry_ptr->lru_rank = lru_rank;
            lru_rank++;
        } /* end else-if */

        entries_visited++;
        entry_ptr = entry_ptr->next;
    } /* end while */
    HDassert(entries_visited == cache_ptr->LRU_list_len);

    image_len += H5F_SIZEOF_CHKSUM;
    cache_ptr->image_data_len = image_len;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__prep_for_file_close__scan_entries() */


/*-------------------------------------------------------------------------
 * Function:    H5C__reconstruct_cache_contents()
 *
 * Purpose:     Scan the image buffer, and create a prefetched
 *		cache entry for every entry in the buffer.  Insert the 
 *		prefetched entries in the index and the LRU, and 
 *		reconstruct any flush dependencies.  Order the entries 
 *		in the LRU as indicated by the stored lru_ranks.
 *
 * Return:      SUCCEED on success, and FAIL on failure.
 *
 * Programmer:  John Mainzer
 *              8/14/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__reconstruct_cache_contents(H5F_t *f, H5C_t *cache_ptr)
{
    H5C_cache_entry_t *	pf_entry_ptr;   /* Pointer to prefetched entry */
    H5C_cache_entry_t *	parent_ptr;     /* Pointer to parent of prefetched entry */
    const uint8_t *	p;              /* Pointer into image buffer */
    unsigned		u, v;           /* Local index variable */
    herr_t 		ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(cache_ptr == f->shared->cache);
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->image_buffer);
    HDassert(cache_ptr->image_len > 0);

    /* Decode metadata cache image header */
    p = (uint8_t *)cache_ptr->image_buffer;
    if(H5C__decode_cache_image_header(f, cache_ptr, &p) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTDECODE, FAIL, "cache image header decode failed")
    HDassert((size_t)(p - (uint8_t *)cache_ptr->image_buffer) < cache_ptr->image_len);

    /* The image_data_len and # of entries should be defined now */
    HDassert(cache_ptr->image_data_len > 0);
    HDassert(cache_ptr->image_data_len <= cache_ptr->image_len);
    HDassert(cache_ptr->num_entries_in_image > 0);

    /* Reconstruct entries in image */
    for(u = 0; u < cache_ptr->num_entries_in_image; u++) {
	/* Create the prefetched entry described by the ith
         * entry in cache_ptr->image_entrise.
         */
	if(NULL == (pf_entry_ptr = H5C__reconstruct_cache_entry(f, cache_ptr, &p)))
            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "reconstruction of cache entry failed")

	/* Note that we make no checks on available cache space before 
         * inserting the reconstructed entry into the metadata cache.
         *
         * This is OK since the cache must be almost empty at the beginning
         * of the process, and since we check cache size at the end of the 
         * reconstruction process.
         */

	/* Insert the prefetched entry in the index */
	H5C__INSERT_IN_INDEX(cache_ptr, pf_entry_ptr, FAIL)

	/* If dirty, insert the entry into the slist. */
	if(pf_entry_ptr->is_dirty)
	    H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, pf_entry_ptr, FAIL)

        /* Append the entry to the LRU */
	H5C__UPDATE_RP_FOR_INSERT_APPEND(cache_ptr, pf_entry_ptr, FAIL)

	H5C__UPDATE_STATS_FOR_PREFETCH(cache_ptr, pf_entry_ptr->is_dirty)

	/* If the prefetched entry is the child in one or more flush 
         * dependency relationships, recreate those flush dependencies.
         */
	for(v = 0; v < pf_entry_ptr->fd_parent_count; v++) {
            /* Sanity checks */
	    HDassert(pf_entry_ptr->fd_parent_addrs);
	    HDassert(H5F_addr_defined(pf_entry_ptr->fd_parent_addrs[v]));

            /* Find the parent entry */
	    parent_ptr = NULL;
	    H5C__SEARCH_INDEX(cache_ptr, pf_entry_ptr->fd_parent_addrs[v], parent_ptr, FAIL)
	    if(parent_ptr == NULL)
                HGOTO_ERROR(H5E_CACHE, H5E_NOTFOUND, FAIL, "fd parent not in cache?!?")

            /* Sanity checks */
	    HDassert(parent_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
            HDassert(parent_ptr->addr == pf_entry_ptr->fd_parent_addrs[v]);
            HDassert(parent_ptr->lru_rank == -1);

	    /* Must protect parent entry to set up a flush dependency.
             * Do this now, and then uprotect when done.
             */
            H5C__UPDATE_RP_FOR_PROTECT(cache_ptr, parent_ptr, FAIL)
            parent_ptr->is_protected = TRUE;
	    
	    /* Setup the flush dependency */
	    if(H5C_create_flush_dependency(parent_ptr, pf_entry_ptr) < 0)
		HGOTO_ERROR(H5E_CACHE, H5E_CANTDEPEND, FAIL, "Can't restore flush dependency")

	    /* And now unprotect */
	    H5C__UPDATE_RP_FOR_UNPROTECT(cache_ptr, parent_ptr, FAIL)
	    parent_ptr->is_protected = FALSE;
        } /* end for */
    } /* end for */

#ifndef NDEBUG
    /* Scan the cache entries, and verify that each entry has
     * the expected flush dependency status.
     */
    pf_entry_ptr = cache_ptr->il_head;
    while(pf_entry_ptr != NULL) {
        HDassert(pf_entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
        HDassert((pf_entry_ptr->prefetched && pf_entry_ptr->type == H5AC_PREFETCHED_ENTRY)
            || (!pf_entry_ptr->prefetched && pf_entry_ptr->type != H5AC_PREFETCHED_ENTRY));
        if(pf_entry_ptr->type == H5AC_PREFETCHED_ENTRY)
            HDassert(pf_entry_ptr->fd_parent_count == pf_entry_ptr->flush_dep_nparents);

        for(v = 0; v < pf_entry_ptr->fd_parent_count; v++) {
            parent_ptr = pf_entry_ptr->flush_dep_parent[v];
            HDassert(parent_ptr);
            HDassert(parent_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
            HDassert(pf_entry_ptr->fd_parent_addrs);
            HDassert(pf_entry_ptr->fd_parent_addrs[v] == parent_ptr->addr);
            HDassert(parent_ptr->flush_dep_nchildren > 0);
        } /* end for */

        if(pf_entry_ptr->type == H5AC_PREFETCHED_ENTRY) {
            HDassert(pf_entry_ptr->fd_child_count == pf_entry_ptr->flush_dep_nchildren);
            HDassert(pf_entry_ptr->fd_dirty_child_count == pf_entry_ptr->flush_dep_ndirty_children);
        } /* end if */

        pf_entry_ptr = pf_entry_ptr->il_next;
    } /* end while */

    /* Scan the LRU, and verify the expected ordering of the 
     * prefetched entries.
     */
    {
	int lru_rank_holes = 0;
        H5C_cache_entry_t *entry_ptr;
        int     i;              /* Local index variable */

        i = -1;
        entry_ptr = cache_ptr->LRU_head_ptr;

        while(entry_ptr != NULL) {

            HDassert(entry_ptr->magic == H5C__H5C_CACHE_ENTRY_T_MAGIC);
            HDassert(entry_ptr->type != NULL);

            if ( entry_ptr->prefetched ) {

                HDassert(entry_ptr->lru_rank != 0);
                HDassert((entry_ptr->lru_rank == -1) ||
                         (entry_ptr->lru_rank > i));

                if ( ( entry_ptr->lru_rank > 1 ) && 
                     ( entry_ptr->lru_rank > i + 1 ) )

                    lru_rank_holes += entry_ptr->lru_rank - (i + 1);

                i = entry_ptr->lru_rank;

            } /* end if */

            entry_ptr = entry_ptr->next;
        } /* end while */

	/* Holes in the sequences of LRU ranks can appear due to epoch 
         * markers.  They are left in to allow re-insertion of the
         * epoch markers on reconstruction of the cache -- thus 
         * the following sanity check will have to be revised when
         * we add code to store and restore adaptive resize status.
         */
	HDassert(lru_rank_holes <= H5C__MAX_EPOCH_MARKERS);
    } /* end block */
#endif /* NDEBUG */

    /* Check to see if the cache is oversize, and evict entries as 
     * necessary to remain within limits.
     */
    if(cache_ptr->index_size >= cache_ptr->max_cache_size) {
	/* cache is oversized -- call H5C__make_space_in_cache() with zero
         * space needed to repair the situation if possible.
         */
        hbool_t write_permitted = FALSE;

	if(cache_ptr->check_write_permitted != NULL) {
	    if((cache_ptr->check_write_permitted)(f, &write_permitted) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "Can't get write_permitted")
        } /* end if */
        else
            write_permitted = cache_ptr->write_permitted;

	if(H5C__make_space_in_cache(f, 0, write_permitted) < 0)
	    HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, FAIL, "H5C__make_space_in_cache failed")
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__reconstruct_cache_contents() */


/*-------------------------------------------------------------------------
 * Function:    H5C__reconstruct_cache_entry()
 *
 * Purpose:     Allocate a prefetched metadata cache entry and initialize
 *		it from image buffer.
 *
 *		Return a pointer to the newly allocated cache entry,
 *		or NULL on failure.
 *
 * Return:      Pointer to the new instance of H5C_cache_entry on success, 
 *		or NULL on failure.
 *
 * Programmer:  John Mainzer
 *              8/14/15
 *
 *-------------------------------------------------------------------------
 */
static H5C_cache_entry_t *
H5C__reconstruct_cache_entry(const H5F_t *f, H5C_t *cache_ptr,
    const uint8_t **buf)
{
    H5C_cache_entry_t *pf_entry_ptr = NULL;     /* Reconstructed cache entry */
    uint8_t             flags = 0;
    hbool_t		is_dirty = FALSE;
#ifndef NDEBUG	/* only used in assertions */
    hbool_t		in_lru = FALSE;
    hbool_t		is_fd_parent = FALSE;
    hbool_t		is_fd_child = FALSE;
#endif /* NDEBUG */ /* only used in assertions */
    const uint8_t *	p;
    hbool_t            file_is_rw;
    H5C_cache_entry_t *ret_value = NULL;        /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->num_entries_in_image > 0);
    HDassert(buf && *buf);

    /* Key R/W access off of whether the image will be deleted */
    file_is_rw = cache_ptr->delete_image;

    /* Allocate space for the prefetched cache entry */
    if(NULL == (pf_entry_ptr = H5FL_CALLOC(H5C_cache_entry_t)))
	HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, "memory allocation failed for prefetched cache entry")

    /* Get pointer to buffer */
    p = *buf;

    /* Decode type id */
    pf_entry_ptr->prefetch_type_id = *p++;

    /* Decode flags */
    flags = *p++;
    if(flags & H5C__MDCI_ENTRY_DIRTY_FLAG)
        is_dirty = TRUE;
#ifndef NDEBUG	/* only used in assertions */
    if(flags & H5C__MDCI_ENTRY_IN_LRU_FLAG)
        in_lru = TRUE;
    if(flags & H5C__MDCI_ENTRY_IS_FD_PARENT_FLAG)
        is_fd_parent = TRUE;
    if(flags & H5C__MDCI_ENTRY_IS_FD_CHILD_FLAG)
        is_fd_child = TRUE;
#endif /* NDEBUG */ /* only used in assertions */

    /* Force dirty entries to clean if the file read only -- must do 
     * this as otherwise the cache will attempt to write them on file
     * close.  Since the file is R/O, the metadata cache image superblock
     * extension message and the cache image block will not be removed.
     * Hence no danger in this for subsequent opens.
     *
     * However, if the dirty entry (marked clean for purposes of the R/O
     * file open) is evicted and then referred to, the cache will read
     * either invalid or obsolete data from the file.  Handle this by 
     * setting the prefetched_dirty field, and hiding such entries from
     * the eviction candidate selection algorithm.
     */
    pf_entry_ptr->is_dirty = (is_dirty && file_is_rw);

    /* Decode ring */
    pf_entry_ptr->ring = *p++;
    HDassert(pf_entry_ptr->ring > (uint8_t)(H5C_RING_UNDEFINED));
    HDassert(pf_entry_ptr->ring < (uint8_t)(H5C_RING_NTYPES));

    /* Decode age */
    pf_entry_ptr->age = *p++;

    /* Decode dependency child count */
    UINT16DECODE(p, pf_entry_ptr->fd_child_count);
    HDassert((is_fd_parent && pf_entry_ptr->fd_child_count > 0) || (!is_fd_parent && pf_entry_ptr->fd_child_count == 0));

    /* Decode dirty dependency child count */
    UINT16DECODE(p, pf_entry_ptr->fd_dirty_child_count);
    if(!file_is_rw) 
        pf_entry_ptr->fd_dirty_child_count      = 0;
    if(pf_entry_ptr->fd_dirty_child_count > pf_entry_ptr->fd_child_count)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "invalid dirty flush dependency child count")

    /* Decode dependency parent count */
    UINT16DECODE(p, pf_entry_ptr->fd_parent_count);
    HDassert((is_fd_child && pf_entry_ptr->fd_parent_count > 0) || (!is_fd_child && pf_entry_ptr->fd_parent_count == 0));

    /* Decode index in LRU */
    INT32DECODE(p, pf_entry_ptr->lru_rank);
    HDassert((in_lru && pf_entry_ptr->lru_rank >= 0) || (!in_lru && pf_entry_ptr->lru_rank == -1));

    /* Decode entry offset */
    H5F_addr_decode(f, &p, &pf_entry_ptr->addr);
    if(!H5F_addr_defined(pf_entry_ptr->addr))
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "invalid entry offset")

    /* Decode entry length */
    H5F_DECODE_LENGTH(f, p, pf_entry_ptr->size);
    if(pf_entry_ptr->size == 0)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "invalid entry size")

    /* Verify expected length of entry image */
    if((size_t)(p - *buf) != H5C__cache_image_block_entry_header_size(f))
        HGOTO_ERROR(H5E_CACHE, H5E_BADSIZE, NULL, "Bad entry image len")
    
    /* If parent count greater than zero, allocate array for parent 
     * addresses, and decode addresses into the array.
     */
    if(pf_entry_ptr->fd_parent_count > 0) {
        unsigned u;          /* Local index variable */

        if(NULL == (pf_entry_ptr->fd_parent_addrs = (haddr_t *)H5MM_malloc((size_t)(pf_entry_ptr->fd_parent_count) * H5F_SIZEOF_ADDR(f))))
	    HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, "memory allocation failed for fd parent addrs buffer")

	for(u = 0; u < pf_entry_ptr->fd_parent_count; u++) {
            H5F_addr_decode(f, &p, &(pf_entry_ptr->fd_parent_addrs[u]));
            if(!H5F_addr_defined(pf_entry_ptr->fd_parent_addrs[u]))
                HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "invalid flush dependency parent offset")
        } /* end for */
    } /* end if */

    /* Allocate buffer for entry image */
    if(NULL == (pf_entry_ptr->image_ptr = H5MM_malloc(pf_entry_ptr->size + H5C_IMAGE_EXTRA_SPACE)))
	HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, "memory allocation failed for on disk image buffer")
#if H5C_DO_MEMORY_SANITY_CHECKS
    HDmemcpy(((uint8_t *)pf_entry_ptr->image_ptr) + size, H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

    /* Copy the entry image from the cache image block */
    HDmemcpy(pf_entry_ptr->image_ptr, p, pf_entry_ptr->size);
    p += pf_entry_ptr->size;

    /* Initialize the rest of the fields in the prefetched entry */
    /* (Only need to set non-zero/NULL/FALSE fields, due to calloc() above) */
    pf_entry_ptr->magic				= H5C__H5C_CACHE_ENTRY_T_MAGIC;
    pf_entry_ptr->cache_ptr 			= cache_ptr;
    pf_entry_ptr->image_up_to_date		= TRUE;
    pf_entry_ptr->type				= H5AC_PREFETCHED_ENTRY;
    pf_entry_ptr->prefetched			= TRUE;
    pf_entry_ptr->prefetched_dirty              = is_dirty && (!file_is_rw);

    /* Sanity checks */
    HDassert(pf_entry_ptr->size > 0 && pf_entry_ptr->size < H5C_MAX_ENTRY_SIZE);

    /* Update buffer pointer */
    *buf = p;

    ret_value = pf_entry_ptr;

done:
    if(NULL == ret_value && pf_entry_ptr)
        pf_entry_ptr = H5FL_FREE(H5C_cache_entry_t, pf_entry_ptr);

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__reconstruct_cache_entry() */


/*-------------------------------------------------------------------------
 * Function:    H5C__write_cache_image_superblock_msg
 *
 * Purpose:     Write the cache image superblock extension message, 
 *		creating if specified.
 *
 *		In general, the size and location of the cache image block
 *		will be unknow at the time that the cache image superblock
 *		message is created.  A subsequent call to this routine will
 *		be used to write the correct data.
 *
 * Return:      Non-negative on success/Negative on failure.
 *
 * Programmer:  John Mainzer, 7/4/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__write_cache_image_superblock_msg(H5F_t *f, hbool_t create)
{
    H5C_t *		cache_ptr;
    H5O_mdci_t 	        mdci_msg;	/* metadata cache image message */
					/* to insert in the superblock  */
					/* extension.			*/
    unsigned	   	mesg_flags = H5O_MSG_FLAG_FAIL_IF_UNKNOWN_ALWAYS;
    herr_t              ret_value = SUCCEED;      /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(f->shared);
    HDassert(f->shared->cache);
    cache_ptr = f->shared->cache;
    HDassert(cache_ptr);
    HDassert(cache_ptr->magic == H5C__H5C_T_MAGIC);
    HDassert(cache_ptr->close_warning_received);

    /* Write data into the metadata cache image superblock extension message.
     * Note that this data will be bogus when we first create the message.
     * We will overwrite this data later in a second call to this function.
     */
    mdci_msg.addr = cache_ptr->image_addr;
#ifdef H5_HAVE_PARALLEL
    if(cache_ptr->aux_ptr) { /* we have multiple processes */
        H5AC_aux_t * aux_ptr;

        aux_ptr = (H5AC_aux_t *)cache_ptr->aux_ptr;
        HDassert(aux_ptr->magic == H5AC__H5AC_AUX_T_MAGIC);
        mdci_msg.size = aux_ptr->p0_image_len;
    } /* end if */
    else
#endif /* H5_HAVE_PARALLEL */
        mdci_msg.size = cache_ptr->image_len;

    /* Write metadata cache image message to superblock extension */
    if(H5F__super_ext_write_msg(f, H5O_MDCI_MSG_ID, &mdci_msg, create, mesg_flags) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_WRITEERROR, FAIL, "can't write metadata cache image message to superblock extension")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__write_cache_image_superblock_msg() */


/*-------------------------------------------------------------------------
 * Function:    H5C__write_cache_image
 *
 * Purpose:	Write the supplied metadata cache image to the specified
 *		location in file.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/26/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__write_cache_image(H5F_t *f, const H5C_t *cache_ptr)
{
    herr_t              ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_STATIC

    /* Sanity checks */
    HDassert(f);
    HDassert(cache_ptr);
    HDassert(H5F_addr_defined(cache_ptr->image_addr));
    HDassert(cache_ptr->image_len > 0);
    HDassert(cache_ptr->image_buffer);

#ifdef H5_HAVE_PARALLEL
{
    H5AC_aux_t *aux_ptr = (H5AC_aux_t *)cache_ptr->aux_ptr;

    if((NULL == aux_ptr) || (aux_ptr->mpi_rank == 0)) {
	HDassert((NULL == aux_ptr) || (aux_ptr->magic == H5AC__H5AC_AUX_T_MAGIC));
#endif /* H5_HAVE_PARALLEL */

	/* Write the buffer (if serial access, or rank 0 for parallel access) */
	if(H5F_block_write(f, H5FD_MEM_SUPER, cache_ptr->image_addr, cache_ptr->image_len, cache_ptr->image_buffer) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "can't write metadata cache image block to file")
#ifdef H5_HAVE_PARALLEL
    } /* end if */
} /* end block */
#endif /* H5_HAVE_PARALLEL */
	
done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__write_cache_image() */