summaryrefslogtreecommitdiffstats
path: root/src/H5Centry.c
blob: 130995c97d86665f46dea3a9a65ed20c0a9dedac (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
1231
1232
1233
1234
1235
1236
1237
1238
1239
1240
1241
1242
1243
1244
1245
1246
1247
1248
1249
1250
1251
1252
1253
1254
1255
1256
1257
1258
1259
1260
1261
1262
1263
1264
1265
1266
1267
1268
1269
1270
1271
1272
1273
1274
1275
1276
1277
1278
1279
1280
1281
1282
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299
1300
1301
1302
1303
1304
1305
1306
1307
1308
1309
1310
1311
1312
1313
1314
1315
1316
1317
1318
1319
1320
1321
1322
1323
1324
1325
1326
1327
1328
1329
1330
1331
1332
1333
1334
1335
1336
1337
1338
1339
1340
1341
1342
1343
1344
1345
1346
1347
1348
1349
1350
1351
1352
1353
1354
1355
1356
1357
1358
1359
1360
1361
1362
1363
1364
1365
1366
1367
1368
1369
1370
1371
1372
1373
1374
1375
1376
1377
1378
1379
1380
1381
1382
1383
1384
1385
1386
1387
1388
1389
1390
1391
1392
1393
1394
1395
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405
1406
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416
1417
1418
1419
1420
1421
1422
1423
1424
1425
1426
1427
1428
1429
1430
1431
1432
1433
1434
1435
1436
1437
1438
1439
1440
1441
1442
1443
1444
1445
1446
1447
1448
1449
1450
1451
1452
1453
1454
1455
1456
1457
1458
1459
1460
1461
1462
1463
1464
1465
1466
1467
1468
1469
1470
1471
1472
1473
1474
1475
1476
1477
1478
1479
1480
1481
1482
1483
1484
1485
1486
1487
1488
1489
1490
1491
1492
1493
1494
1495
1496
1497
1498
1499
1500
1501
1502
1503
1504
1505
1506
1507
1508
1509
1510
1511
1512
1513
1514
1515
1516
1517
1518
1519
1520
1521
1522
1523
1524
1525
1526
1527
1528
1529
1530
1531
1532
1533
1534
1535
1536
1537
1538
1539
1540
1541
1542
1543
1544
1545
1546
1547
1548
1549
1550
1551
1552
1553
1554
1555
1556
1557
1558
1559
1560
1561
1562
1563
1564
1565
1566
1567
1568
1569
1570
1571
1572
1573
1574
1575
1576
1577
1578
1579
1580
1581
1582
1583
1584
1585
1586
1587
1588
1589
1590
1591
1592
1593
1594
1595
1596
1597
1598
1599
1600
1601
1602
1603
1604
1605
1606
1607
1608
1609
1610
1611
1612
1613
1614
1615
1616
1617
1618
1619
1620
1621
1622
1623
1624
1625
1626
1627
1628
1629
1630
1631
1632
1633
1634
1635
1636
1637
1638
1639
1640
1641
1642
1643
1644
1645
1646
1647
1648
1649
1650
1651
1652
1653
1654
1655
1656
1657
1658
1659
1660
1661
1662
1663
1664
1665
1666
1667
1668
1669
1670
1671
1672
1673
1674
1675
1676
1677
1678
1679
1680
1681
1682
1683
1684
1685
1686
1687
1688
1689
1690
1691
1692
1693
1694
1695
1696
1697
1698
1699
1700
1701
1702
1703
1704
1705
1706
1707
1708
1709
1710
1711
1712
1713
1714
1715
1716
1717
1718
1719
1720
1721
1722
1723
1724
1725
1726
1727
1728
1729
1730
1731
1732
1733
1734
1735
1736
1737
1738
1739
1740
1741
1742
1743
1744
1745
1746
1747
1748
1749
1750
1751
1752
1753
1754
1755
1756
1757
1758
1759
1760
1761
1762
1763
1764
1765
1766
1767
1768
1769
1770
1771
1772
1773
1774
1775
1776
1777
1778
1779
1780
1781
1782
1783
1784
1785
1786
1787
1788
1789
1790
1791
1792
1793
1794
1795
1796
1797
1798
1799
1800
1801
1802
1803
1804
1805
1806
1807
1808
1809
1810
1811
1812
1813
1814
1815
1816
1817
1818
1819
1820
1821
1822
1823
1824
1825
1826
1827
1828
1829
1830
1831
1832
1833
1834
1835
1836
1837
1838
1839
1840
1841
1842
1843
1844
1845
1846
1847
1848
1849
1850
1851
1852
1853
1854
1855
1856
1857
1858
1859
1860
1861
1862
1863
1864
1865
1866
1867
1868
1869
1870
1871
1872
1873
1874
1875
1876
1877
1878
1879
1880
1881
1882
1883
1884
1885
1886
1887
1888
1889
1890
1891
1892
1893
1894
1895
1896
1897
1898
1899
1900
1901
1902
1903
1904
1905
1906
1907
1908
1909
1910
1911
1912
1913
1914
1915
1916
1917
1918
1919
1920
1921
1922
1923
1924
1925
1926
1927
1928
1929
1930
1931
1932
1933
1934
1935
1936
1937
1938
1939
1940
1941
1942
1943
1944
1945
1946
1947
1948
1949
1950
1951
1952
1953
1954
1955
1956
1957
1958
1959
1960
1961
1962
1963
1964
1965
1966
1967
1968
1969
1970
1971
1972
1973
1974
1975
1976
1977
1978
1979
1980
1981
1982
1983
1984
1985
1986
1987
1988
1989
1990
1991
1992
1993
1994
1995
1996
1997
1998
1999
2000
2001
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
2012
2013
2014
2015
2016
2017
2018
2019
2020
2021
2022
2023
2024
2025
2026
2027
2028
2029
2030
2031
2032
2033
2034
2035
2036
2037
2038
2039
2040
2041
2042
2043
2044
2045
2046
2047
2048
2049
2050
2051
2052
2053
2054
2055
2056
2057
2058
2059
2060
2061
2062
2063
2064
2065
2066
2067
2068
2069
2070
2071
2072
2073
2074
2075
2076
2077
2078
2079
2080
2081
2082
2083
2084
2085
2086
2087
2088
2089
2090
2091
2092
2093
2094
2095
2096
2097
2098
2099
2100
2101
2102
2103
2104
2105
2106
2107
2108
2109
2110
2111
2112
2113
2114
2115
2116
2117
2118
2119
2120
2121
2122
2123
2124
2125
2126
2127
2128
2129
2130
2131
2132
2133
2134
2135
2136
2137
2138
2139
2140
2141
2142
2143
2144
2145
2146
2147
2148
2149
2150
2151
2152
2153
2154
2155
2156
2157
2158
2159
2160
2161
2162
2163
2164
2165
2166
2167
2168
2169
2170
2171
2172
2173
2174
2175
2176
2177
2178
2179
2180
2181
2182
2183
2184
2185
2186
2187
2188
2189
2190
2191
2192
2193
2194
2195
2196
2197
2198
2199
2200
2201
2202
2203
2204
2205
2206
2207
2208
2209
2210
2211
2212
2213
2214
2215
2216
2217
2218
2219
2220
2221
2222
2223
2224
2225
2226
2227
2228
2229
2230
2231
2232
2233
2234
2235
2236
2237
2238
2239
2240
2241
2242
2243
2244
2245
2246
2247
2248
2249
2250
2251
2252
2253
2254
2255
2256
2257
2258
2259
2260
2261
2262
2263
2264
2265
2266
2267
2268
2269
2270
2271
2272
2273
2274
2275
2276
2277
2278
2279
2280
2281
2282
2283
2284
2285
2286
2287
2288
2289
2290
2291
2292
2293
2294
2295
2296
2297
2298
2299
2300
2301
2302
2303
2304
2305
2306
2307
2308
2309
2310
2311
2312
2313
2314
2315
2316
2317
2318
2319
2320
2321
2322
2323
2324
2325
2326
2327
2328
2329
2330
2331
2332
2333
2334
2335
2336
2337
2338
2339
2340
2341
2342
2343
2344
2345
2346
2347
2348
2349
2350
2351
2352
2353
2354
2355
2356
2357
2358
2359
2360
2361
2362
2363
2364
2365
2366
2367
2368
2369
2370
2371
2372
2373
2374
2375
2376
2377
2378
2379
2380
2381
2382
2383
2384
2385
2386
2387
2388
2389
2390
2391
2392
2393
2394
2395
2396
2397
2398
2399
2400
2401
2402
2403
2404
2405
2406
2407
2408
2409
2410
2411
2412
2413
2414
2415
2416
2417
2418
2419
2420
2421
2422
2423
2424
2425
2426
2427
2428
2429
2430
2431
2432
2433
2434
2435
2436
2437
2438
2439
2440
2441
2442
2443
2444
2445
2446
2447
2448
2449
2450
2451
2452
2453
2454
2455
2456
2457
2458
2459
2460
2461
2462
2463
2464
2465
2466
2467
2468
2469
2470
2471
2472
2473
2474
2475
2476
2477
2478
2479
2480
2481
2482
2483
2484
2485
2486
2487
2488
2489
2490
2491
2492
2493
2494
2495
2496
2497
2498
2499
2500
2501
2502
2503
2504
2505
2506
2507
2508
2509
2510
2511
2512
2513
2514
2515
2516
2517
2518
2519
2520
2521
2522
2523
2524
2525
2526
2527
2528
2529
2530
2531
2532
2533
2534
2535
2536
2537
2538
2539
2540
2541
2542
2543
2544
2545
2546
2547
2548
2549
2550
2551
2552
2553
2554
2555
2556
2557
2558
2559
2560
2561
2562
2563
2564
2565
2566
2567
2568
2569
2570
2571
2572
2573
2574
2575
2576
2577
2578
2579
2580
2581
2582
2583
2584
2585
2586
2587
2588
2589
2590
2591
2592
2593
2594
2595
2596
2597
2598
2599
2600
2601
2602
2603
2604
2605
2606
2607
2608
2609
2610
2611
2612
2613
2614
2615
2616
2617
2618
2619
2620
2621
2622
2623
2624
2625
2626
2627
2628
2629
2630
2631
2632
2633
2634
2635
2636
2637
2638
2639
2640
2641
2642
2643
2644
2645
2646
2647
2648
2649
2650
2651
2652
2653
2654
2655
2656
2657
2658
2659
2660
2661
2662
2663
2664
2665
2666
2667
2668
2669
2670
2671
2672
2673
2674
2675
2676
2677
2678
2679
2680
2681
2682
2683
2684
2685
2686
2687
2688
2689
2690
2691
2692
2693
2694
2695
2696
2697
2698
2699
2700
2701
2702
2703
2704
2705
2706
2707
2708
2709
2710
2711
2712
2713
2714
2715
2716
2717
2718
2719
2720
2721
2722
2723
2724
2725
2726
2727
2728
2729
2730
2731
2732
2733
2734
2735
2736
2737
2738
2739
2740
2741
2742
2743
2744
2745
2746
2747
2748
2749
2750
2751
2752
2753
2754
2755
2756
2757
2758
2759
2760
2761
2762
2763
2764
2765
2766
2767
2768
2769
2770
2771
2772
2773
2774
2775
2776
2777
2778
2779
2780
2781
2782
2783
2784
2785
2786
2787
2788
2789
2790
2791
2792
2793
2794
2795
2796
2797
2798
2799
2800
2801
2802
2803
2804
2805
2806
2807
2808
2809
2810
2811
2812
2813
2814
2815
2816
2817
2818
2819
2820
2821
2822
2823
2824
2825
2826
2827
2828
2829
2830
2831
2832
2833
2834
2835
2836
2837
2838
2839
2840
2841
2842
2843
2844
2845
2846
2847
2848
2849
2850
2851
2852
2853
2854
2855
2856
2857
2858
2859
2860
2861
2862
2863
2864
2865
2866
2867
2868
2869
2870
2871
2872
2873
2874
2875
2876
2877
2878
2879
2880
2881
2882
2883
2884
2885
2886
2887
2888
2889
2890
2891
2892
2893
2894
2895
2896
2897
2898
2899
2900
2901
2902
2903
2904
2905
2906
2907
2908
2909
2910
2911
2912
2913
2914
2915
2916
2917
2918
2919
2920
2921
2922
2923
2924
2925
2926
2927
2928
2929
2930
2931
2932
2933
2934
2935
2936
2937
2938
2939
2940
2941
2942
2943
2944
2945
2946
2947
2948
2949
2950
2951
2952
2953
2954
2955
2956
2957
2958
2959
2960
2961
2962
2963
2964
2965
2966
2967
2968
2969
2970
2971
2972
2973
2974
2975
2976
2977
2978
2979
2980
2981
2982
2983
2984
2985
2986
2987
2988
2989
2990
2991
2992
2993
2994
2995
2996
2997
2998
2999
3000
3001
3002
3003
3004
3005
3006
3007
3008
3009
3010
3011
3012
3013
3014
3015
3016
3017
3018
3019
3020
3021
3022
3023
3024
3025
3026
3027
3028
3029
3030
3031
3032
3033
3034
3035
3036
3037
3038
3039
3040
3041
3042
3043
3044
3045
3046
3047
3048
3049
3050
3051
3052
3053
3054
3055
3056
3057
3058
3059
3060
3061
3062
3063
3064
3065
3066
3067
3068
3069
3070
3071
3072
3073
3074
3075
3076
3077
3078
3079
3080
3081
3082
3083
3084
3085
3086
3087
3088
3089
3090
3091
3092
3093
3094
3095
3096
3097
3098
3099
3100
3101
3102
3103
3104
3105
3106
3107
3108
3109
3110
3111
3112
3113
3114
3115
3116
3117
3118
3119
3120
3121
3122
3123
3124
3125
3126
3127
3128
3129
3130
3131
3132
3133
3134
3135
3136
3137
3138
3139
3140
3141
3142
3143
3144
3145
3146
3147
3148
3149
3150
3151
3152
3153
3154
3155
3156
3157
3158
3159
3160
3161
3162
3163
3164
3165
3166
3167
3168
3169
3170
3171
3172
3173
3174
3175
3176
3177
3178
3179
3180
3181
3182
3183
3184
3185
3186
3187
3188
3189
3190
3191
3192
3193
3194
3195
3196
3197
3198
3199
3200
3201
3202
3203
3204
3205
3206
3207
3208
3209
3210
3211
3212
3213
3214
3215
3216
3217
3218
3219
3220
3221
3222
3223
3224
3225
3226
3227
3228
3229
3230
3231
3232
3233
3234
3235
3236
3237
3238
3239
3240
3241
3242
3243
3244
3245
3246
3247
3248
3249
3250
3251
3252
3253
3254
3255
3256
3257
3258
3259
3260
3261
3262
3263
3264
3265
3266
3267
3268
3269
3270
3271
3272
3273
3274
3275
3276
3277
3278
3279
3280
3281
3282
3283
3284
3285
3286
3287
3288
3289
3290
3291
3292
3293
3294
3295
3296
3297
3298
3299
3300
3301
3302
3303
3304
3305
3306
3307
3308
3309
3310
3311
3312
3313
3314
3315
3316
3317
3318
3319
3320
3321
3322
3323
3324
3325
3326
3327
3328
3329
3330
3331
3332
3333
3334
3335
3336
3337
3338
3339
3340
3341
3342
3343
3344
3345
3346
3347
3348
3349
3350
3351
3352
3353
3354
3355
3356
3357
3358
3359
3360
3361
3362
3363
3364
3365
3366
3367
3368
3369
3370
3371
3372
3373
3374
3375
3376
3377
3378
3379
3380
3381
3382
3383
3384
3385
3386
3387
3388
3389
3390
3391
3392
3393
3394
3395
3396
3397
3398
3399
3400
3401
3402
3403
3404
3405
3406
3407
3408
3409
3410
3411
3412
3413
3414
3415
3416
3417
3418
3419
3420
3421
3422
3423
3424
3425
3426
3427
3428
3429
3430
3431
3432
3433
3434
3435
3436
3437
3438
3439
3440
3441
3442
3443
3444
3445
3446
3447
3448
3449
3450
3451
3452
3453
3454
3455
3456
3457
3458
3459
3460
3461
3462
3463
3464
3465
3466
3467
3468
3469
3470
3471
3472
3473
3474
3475
3476
3477
3478
3479
3480
3481
3482
3483
3484
3485
3486
3487
3488
3489
3490
3491
3492
3493
3494
3495
3496
3497
3498
3499
3500
3501
3502
3503
3504
3505
3506
3507
3508
3509
3510
3511
3512
3513
3514
3515
3516
3517
3518
3519
3520
3521
3522
3523
3524
3525
3526
3527
3528
3529
3530
3531
3532
3533
3534
3535
3536
3537
3538
3539
3540
3541
3542
3543
3544
3545
3546
3547
3548
3549
3550
3551
3552
3553
3554
3555
3556
3557
3558
3559
3560
3561
3562
3563
3564
3565
3566
3567
3568
3569
3570
3571
3572
3573
3574
3575
3576
3577
3578
3579
3580
3581
3582
3583
3584
3585
3586
3587
3588
3589
3590
3591
3592
3593
3594
3595
3596
3597
3598
3599
3600
3601
3602
3603
3604
3605
3606
3607
3608
3609
3610
3611
3612
3613
3614
3615
3616
3617
3618
3619
3620
3621
3622
3623
3624
3625
3626
3627
3628
3629
3630
3631
3632
3633
3634
3635
3636
3637
3638
3639
3640
3641
3642
3643
3644
3645
3646
3647
3648
3649
3650
3651
3652
3653
3654
3655
3656
3657
3658
3659
3660
3661
3662
3663
3664
3665
3666
3667
3668
3669
3670
3671
3672
3673
3674
3675
3676
3677
3678
3679
3680
3681
3682
3683
3684
3685
3686
3687
3688
3689
3690
3691
3692
3693
3694
3695
3696
3697
3698
3699
3700
3701
3702
3703
3704
3705
3706
3707
3708
3709
3710
3711
3712
3713
3714
3715
3716
3717
3718
3719
3720
3721
3722
3723
3724
3725
3726
3727
3728
3729
3730
3731
3732
3733
3734
3735
3736
3737
3738
3739
3740
3741
3742
3743
3744
3745
3746
3747
3748
3749
3750
3751
3752
3753
3754
3755
3756
3757
3758
3759
3760
3761
3762
3763
3764
3765
3766
3767
3768
3769
3770
3771
3772
3773
3774
3775
3776
3777
3778
3779
3780
3781
3782
3783
3784
3785
3786
3787
3788
3789
3790
3791
3792
3793
3794
3795
3796
3797
3798
3799
3800
3801
3802
3803
3804
3805
3806
3807
3808
3809
3810
3811
3812
3813
3814
3815
3816
3817
3818
3819
3820
3821
3822
3823
3824
3825
3826
3827
3828
3829
3830
3831
3832
3833
3834
3835
3836
3837
3838
3839
3840
3841
3842
3843
3844
3845
3846
3847
3848
3849
3850
3851
3852
3853
3854
3855
3856
3857
3858
3859
3860
3861
3862
3863
3864
3865
3866
3867
3868
3869
3870
3871
3872
3873
3874
3875
3876
3877
3878
3879
3880
3881
3882
3883
3884
3885
3886
3887
3888
3889
3890
3891
3892
3893
3894
3895
3896
3897
3898
3899
3900
3901
3902
3903
3904
3905
3906
3907
3908
3909
3910
3911
3912
3913
3914
3915
3916
3917
3918
3919
3920
3921
3922
3923
3924
3925
3926
3927
3928
3929
3930
3931
3932
3933
3934
3935
3936
3937
3938
3939
3940
3941
3942
3943
3944
3945
3946
3947
3948
3949
3950
3951
3952
3953
3954
3955
3956
3957
3958
3959
3960
3961
3962
3963
3964
3965
3966
3967
3968
3969
3970
3971
3972
3973
3974
3975
3976
3977
3978
3979
3980
3981
3982
3983
3984
3985
3986
3987
3988
3989
3990
3991
3992
3993
3994
3995
3996
3997
3998
3999
4000
4001
4002
4003
4004
4005
4006
4007
4008
4009
4010
4011
4012
4013
4014
4015
4016
4017
4018
4019
4020
4021
4022
4023
4024
4025
4026
4027
4028
4029
4030
4031
4032
4033
4034
4035
4036
4037
4038
4039
4040
4041
4042
4043
4044
4045
4046
4047
4048
4049
4050
4051
4052
4053
4054
4055
4056
4057
4058
4059
4060
4061
4062
4063
4064
4065
4066
4067
4068
4069
4070
4071
4072
4073
4074
4075
4076
4077
4078
4079
4080
4081
4082
4083
4084
4085
4086
4087
4088
4089
4090
4091
4092
4093
4094
4095
4096
4097
4098
4099
4100
4101
4102
4103
4104
4105
4106
4107
4108
4109
4110
4111
4112
4113
4114
4115
4116
4117
4118
4119
4120
4121
4122
4123
4124
4125
4126
4127
4128
4129
4130
4131
4132
4133
4134
4135
4136
4137
4138
4139
4140
4141
4142
4143
4144
4145
4146
4147
4148
4149
4150
4151
4152
4153
4154
4155
4156
4157
4158
4159
4160
4161
4162
4163
4164
4165
4166
4167
4168
4169
4170
4171
4172
4173
4174
4175
4176
4177
4178
4179
4180
4181
4182
4183
4184
4185
4186
4187
4188
4189
4190
4191
4192
4193
4194
4195
4196
4197
4198
4199
4200
4201
4202
4203
4204
4205
4206
4207
4208
4209
4210
4211
4212
4213
4214
4215
4216
4217
4218
4219
4220
4221
4222
4223
4224
4225
4226
4227
4228
4229
4230
4231
4232
4233
4234
4235
4236
4237
4238
4239
4240
4241
4242
4243
4244
4245
4246
4247
4248
4249
4250
4251
4252
4253
4254
4255
4256
4257
4258
4259
4260
4261
4262
4263
4264
4265
4266
4267
4268
4269
4270
4271
4272
4273
4274
4275
4276
4277
4278
4279
4280
4281
4282
4283
4284
4285
4286
4287
4288
4289
4290
4291
4292
4293
4294
4295
4296
4297
4298
4299
4300
4301
4302
4303
4304
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * 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://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*-------------------------------------------------------------------------
 *
 * Created:     H5Centry.c
 *              May 8 2023
 *              Quincey Koziol
 *
 * Purpose:     Routines which operate on cache entries.
 *
 *-------------------------------------------------------------------------
 */

/****************/
/* 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            */
#include "H5Cpkg.h"      /* Cache                        */
#include "H5CXprivate.h" /* API Contexts                 */
#include "H5Eprivate.h"  /* Error handling               */
#include "H5Fpkg.h"      /* Files                        */
#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 */

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

/* Alias for pointer to cache entry, for use when allocating sequences of them */
typedef H5C_cache_entry_t *H5C_cache_entry_ptr_t;

/********************/
/* Local Prototypes */
/********************/
static herr_t H5C__pin_entry_from_client(H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr);
static herr_t H5C__unpin_entry_real(H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr, hbool_t update_rp);
static herr_t H5C__unpin_entry_from_client(H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr, hbool_t update_rp);
static herr_t H5C__generate_image(H5F_t *f, H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr);
static herr_t H5C__verify_len_eoa(H5F_t *f, const H5C_class_t *type, haddr_t addr, size_t *len,
                                  hbool_t actual);
static void  *H5C__load_entry(H5F_t *f,
#ifdef H5_HAVE_PARALLEL
                             hbool_t coll_access,
#endif /* H5_HAVE_PARALLEL */
                             const H5C_class_t *type, haddr_t addr, void *udata);
static herr_t H5C__mark_flush_dep_dirty(H5C_cache_entry_t *entry);
static herr_t H5C__mark_flush_dep_clean(H5C_cache_entry_t *entry);
static herr_t H5C__mark_flush_dep_serialized(H5C_cache_entry_t *entry);
static herr_t H5C__mark_flush_dep_unserialized(H5C_cache_entry_t *entry);
#ifndef NDEBUG
static void H5C__assert_flush_dep_nocycle(const H5C_cache_entry_t *entry,
                                          const H5C_cache_entry_t *base_entry);
#endif
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__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);

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

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

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

/* Declare a free list to manage arrays of cache entries */
H5FL_SEQ_DEFINE_STATIC(H5C_cache_entry_ptr_t);

/*-------------------------------------------------------------------------
 * Function:    H5C__pin_entry_from_client()
 *
 * Purpose:     Internal routine to pin a cache entry from a client action.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              3/26/09
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__pin_entry_from_client(H5C_t
#if !H5C_COLLECT_CACHE_STATS
                               H5_ATTR_UNUSED
#endif
                                             *cache_ptr,
                           H5C_cache_entry_t *entry_ptr)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(cache_ptr);
    assert(entry_ptr);
    assert(entry_ptr->is_protected);

    /* Check if the entry is already pinned */
    if (entry_ptr->is_pinned) {
        /* Check if the entry was pinned through an explicit pin from a client */
        if (entry_ptr->pinned_from_client)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "entry is already pinned")
    } /* end if */
    else {
        entry_ptr->is_pinned = TRUE;

        H5C__UPDATE_STATS_FOR_PIN(cache_ptr, entry_ptr)
    } /* end else */

    /* Mark that the entry was pinned through an explicit pin from a client */
    entry_ptr->pinned_from_client = TRUE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__pin_entry_from_client() */

/*-------------------------------------------------------------------------
 * Function:    H5C__unpin_entry_real()
 *
 * Purpose:     Internal routine to unpin a cache entry.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              1/6/18
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__unpin_entry_real(H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr, hbool_t update_rp)
{
    herr_t ret_value = SUCCEED; /* Return value */

#ifdef H5C_DO_SANITY_CHECKS
    FUNC_ENTER_PACKAGE
#else
    FUNC_ENTER_PACKAGE_NOERR
#endif

    /* Sanity checking */
    assert(cache_ptr);
    assert(entry_ptr);
    assert(entry_ptr->is_pinned);

    /* If requested, update the replacement policy if the entry is not protected */
    if (update_rp && !entry_ptr->is_protected)
        H5C__UPDATE_RP_FOR_UNPIN(cache_ptr, entry_ptr, FAIL)

    /* Unpin the entry now */
    entry_ptr->is_pinned = FALSE;

    /* Update the stats for an unpin operation */
    H5C__UPDATE_STATS_FOR_UNPIN(cache_ptr, entry_ptr)

#ifdef H5C_DO_SANITY_CHECKS
done:
#endif
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__unpin_entry_real() */

/*-------------------------------------------------------------------------
 * Function:    H5C__unpin_entry_from_client()
 *
 * Purpose:     Internal routine to unpin a cache entry from a client action.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              3/24/09
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__unpin_entry_from_client(H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr, hbool_t update_rp)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checking */
    assert(cache_ptr);
    assert(entry_ptr);

    /* Error checking (should be sanity checks?) */
    if (!entry_ptr->is_pinned)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "entry isn't pinned")
    if (!entry_ptr->pinned_from_client)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "entry wasn't pinned by cache client")

    /* Check if the entry is not pinned from a flush dependency */
    if (!entry_ptr->pinned_from_cache)
        if (H5C__unpin_entry_real(cache_ptr, entry_ptr, update_rp) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "can't unpin entry")

    /* Mark the entry as explicitly unpinned by the client */
    entry_ptr->pinned_from_client = FALSE;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__unpin_entry_from_client() */

/*-------------------------------------------------------------------------
 * Function:    H5C__generate_image
 *
 * Purpose:     Serialize an entry and generate its image.
 *
 * Note:        This may cause the entry to be re-sized and/or moved in
 *              the cache.
 *
 *              As we will not update the metadata cache's data structures
 *              until we we finish the write, we must touch up these
 *              data structures for size and location changes even if we
 *              are about to delete the entry from the cache (i.e. on a
 *              flush destroy).
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Mohamad Chaarawi
 *              2/10/16
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__generate_image(H5F_t *f, H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr)
{
    haddr_t  new_addr        = HADDR_UNDEF;
    haddr_t  old_addr        = HADDR_UNDEF;
    size_t   new_len         = 0;
    unsigned serialize_flags = H5C__SERIALIZE_NO_FLAGS_SET;
    herr_t   ret_value       = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    assert(f);
    assert(cache_ptr);
    assert(entry_ptr);
    assert(!entry_ptr->image_up_to_date);
    assert(entry_ptr->is_dirty);
    assert(!entry_ptr->is_protected);
    assert(entry_ptr->type);

    /* make note of the entry's current address */
    old_addr = entry_ptr->addr;

    /* Call client's pre-serialize callback, if there's one */
    if ((entry_ptr->type->pre_serialize) &&
        ((entry_ptr->type->pre_serialize)(f, (void *)entry_ptr, entry_ptr->addr, entry_ptr->size, &new_addr,
                                          &new_len, &serialize_flags) < 0))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to pre-serialize entry")

    /* Check for any flags set in the pre-serialize callback */
    if (serialize_flags != H5C__SERIALIZE_NO_FLAGS_SET) {
        /* Check for unexpected flags from serialize callback */
        if (serialize_flags & ~(H5C__SERIALIZE_RESIZED_FLAG | H5C__SERIALIZE_MOVED_FLAG))
            HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unknown serialize flag(s)")

#ifdef H5_HAVE_PARALLEL
        /* In the parallel case, resizes and moves in
         * the serialize operation can cause problems.
         * If they occur, scream and die.
         *
         * At present, in the parallel case, the aux_ptr
         * will only be set if there is more than one
         * process.  Thus we can use this to detect
         * the parallel case.
         *
         * This works for now, but if we start using the
         * aux_ptr for other purposes, we will have to
         * change this test accordingly.
         *
         * NB: While this test detects entryies that attempt
         *     to resize or move themselves during a flush
         *     in the parallel case, it will not detect an
         *     entry that dirties, resizes, and/or moves
         *     other entries during its flush.
         */
        if (cache_ptr->aux_ptr != NULL)
            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "resize/move in serialize occurred in parallel case")
#endif

        /* If required, resize the buffer and update the entry and the cache
         * data structures
         */
        if (serialize_flags & H5C__SERIALIZE_RESIZED_FLAG) {
            /* Sanity check */
            assert(new_len > 0);

            /* Allocate a new image buffer */
            if (NULL ==
                (entry_ptr->image_ptr = H5MM_realloc(entry_ptr->image_ptr, new_len + 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
            H5MM_memcpy(((uint8_t *)entry_ptr->image_ptr) + new_len, H5C_IMAGE_SANITY_VALUE,
                        H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

            /* Update statistics for resizing the entry */
            H5C__UPDATE_STATS_FOR_ENTRY_SIZE_CHANGE(cache_ptr, entry_ptr, new_len);

            /* Update the hash table for the size change */
            H5C__UPDATE_INDEX_FOR_SIZE_CHANGE(cache_ptr, entry_ptr->size, new_len, entry_ptr,
                                              !entry_ptr->is_dirty, FAIL);

            /* The entry can't be protected since we are in the process of
             * flushing it.  Thus we must update the replacement policy data
             * structures for the size change.  The macro deals with the pinned
             * case.
             */
            H5C__UPDATE_RP_FOR_SIZE_CHANGE(cache_ptr, entry_ptr, new_len, FAIL);

            /* As we haven't updated the cache data structures for
             * for the flush or flush destroy yet, the entry should
             * be in the slist if the slist is enabled.  Since
             * H5C__UPDATE_SLIST_FOR_SIZE_CHANGE() is a no-op if the
             * slist is enabled, call it un-conditionally.
             */
            assert(entry_ptr->is_dirty);
            assert((entry_ptr->in_slist) || (!cache_ptr->slist_enabled));

            H5C__UPDATE_SLIST_FOR_SIZE_CHANGE(cache_ptr, entry_ptr->size, new_len);

            /* Finally, update the entry for its new size */
            entry_ptr->size = new_len;
        } /* end if */

        /* If required, udate the entry and the cache data structures
         * for a move
         */
        if (serialize_flags & H5C__SERIALIZE_MOVED_FLAG) {
            /* Update stats and entries relocated counter */
            H5C__UPDATE_STATS_FOR_MOVE(cache_ptr, entry_ptr)

            /* We must update cache data structures for the change in address */
            if (entry_ptr->addr == old_addr) {
                /* Delete the entry from the hash table and the slist */
                H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr, FAIL);
                H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr, FALSE, FAIL)

                /* Update the entry for its new address */
                entry_ptr->addr = new_addr;

                /* And then reinsert in the index and slist */
                H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, FAIL);
                H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL);
            }    /* end if */
            else /* move is already done for us -- just do sanity checks */
                assert(entry_ptr->addr == new_addr);
        } /* end if */
    }     /* end if(serialize_flags != H5C__SERIALIZE_NO_FLAGS_SET) */

    /* Serialize object into buffer */
    if (entry_ptr->type->serialize(f, entry_ptr->image_ptr, entry_ptr->size, (void *)entry_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "unable to serialize entry")

#if H5C_DO_MEMORY_SANITY_CHECKS
    assert(0 == HDmemcmp(((uint8_t *)entry_ptr->image_ptr) + entry_ptr->size, H5C_IMAGE_SANITY_VALUE,
                         H5C_IMAGE_EXTRA_SPACE));
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

    entry_ptr->image_up_to_date = TRUE;

    /* Propagate the fact that the entry is serialized up the
     * flush dependency chain if appropriate.  Since the image must
     * have been out of date for this function to have been called
     * (see assertion on entry), no need to check that -- only check
     * for flush dependency parents.
     */
    assert(entry_ptr->flush_dep_nunser_children == 0);

    if (entry_ptr->flush_dep_nparents > 0)
        if (H5C__mark_flush_dep_serialized(entry_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "Can't propagate serialization status to fd parents")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__generate_image */

/*-------------------------------------------------------------------------
 * Function:    H5C__flush_single_entry
 *
 * Purpose:     Flush or clear (and evict if requested) the cache entry
 *              with the specified address and type.  If the type is NULL,
 *              any unprotected entry at the specified address will be
 *              flushed (and possibly evicted).
 *
 *              Attempts to flush a protected entry will result in an
 *              error.
 *
 *              If the H5C__FLUSH_INVALIDATE_FLAG flag is set, the entry will
 *              be cleared and not flushed, and the call can't be part of a
 *              sequence of flushes.
 *
 *              The function does nothing silently if there is no entry
 *              at the supplied address, or if the entry found has the
 *              wrong type.
 *
 * Return:      Non-negative on success/Negative on failure or if there was
 *              an attempt to flush a protected item.
 *
 * Programmer:  John Mainzer, 5/5/04
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C__flush_single_entry(H5F_t *f, H5C_cache_entry_t *entry_ptr, unsigned flags)
{
    H5C_t  *cache_ptr;                 /* Cache for file */
    hbool_t destroy;                   /* external flag */
    hbool_t clear_only;                /* external flag */
    hbool_t free_file_space;           /* external flag */
    hbool_t take_ownership;            /* external flag */
    hbool_t del_from_slist_on_destroy; /* external flag */
    hbool_t during_flush;              /* external flag */
    hbool_t write_entry;               /* internal flag */
    hbool_t destroy_entry;             /* internal flag */
    hbool_t generate_image;            /* internal flag */
    hbool_t update_page_buffer;        /* internal flag */
    hbool_t was_dirty;
    hbool_t suppress_image_entry_writes = FALSE;
    hbool_t suppress_image_entry_frees  = FALSE;
    haddr_t entry_addr                  = HADDR_UNDEF;
    herr_t  ret_value                   = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    assert(f);
    cache_ptr = f->shared->cache;
    assert(cache_ptr);
    assert(entry_ptr);
    assert(entry_ptr->ring != H5C_RING_UNDEFINED);
    assert(entry_ptr->type);

    /* setup external flags from the flags parameter */
    destroy                   = ((flags & H5C__FLUSH_INVALIDATE_FLAG) != 0);
    clear_only                = ((flags & H5C__FLUSH_CLEAR_ONLY_FLAG) != 0);
    free_file_space           = ((flags & H5C__FREE_FILE_SPACE_FLAG) != 0);
    take_ownership            = ((flags & H5C__TAKE_OWNERSHIP_FLAG) != 0);
    del_from_slist_on_destroy = ((flags & H5C__DEL_FROM_SLIST_ON_DESTROY_FLAG) != 0);
    during_flush              = ((flags & H5C__DURING_FLUSH_FLAG) != 0);
    generate_image            = ((flags & H5C__GENERATE_IMAGE_FLAG) != 0);
    update_page_buffer        = ((flags & H5C__UPDATE_PAGE_BUFFER_FLAG) != 0);

    /* Set the flag for destroying the entry, based on the 'take ownership'
     * and 'destroy' flags
     */
    if (take_ownership)
        destroy_entry = FALSE;
    else
        destroy_entry = destroy;

    /* we will write the entry to disk if it exists, is dirty, and if the
     * clear only flag is not set.
     */
    if (entry_ptr->is_dirty && !clear_only)
        write_entry = TRUE;
    else
        write_entry = FALSE;

    /* if we have received close warning, and we have been instructed to
     * generate a metadata cache image, and we have actually constructed
     * the entry images, set suppress_image_entry_frees to TRUE.
     *
     * Set suppress_image_entry_writes to TRUE if indicated by the
     * image_ctl flags.
     */
    if (cache_ptr->close_warning_received && cache_ptr->image_ctl.generate_image &&
        cache_ptr->num_entries_in_image > 0 && cache_ptr->image_entries != NULL) {

        /* Sanity checks */
        assert(entry_ptr->image_up_to_date || !(entry_ptr->include_in_image));
        assert(entry_ptr->image_ptr || !(entry_ptr->include_in_image));
        assert((!clear_only) || !(entry_ptr->include_in_image));
        assert((!take_ownership) || !(entry_ptr->include_in_image));
        assert((!free_file_space) || !(entry_ptr->include_in_image));

        suppress_image_entry_frees = TRUE;

        if (cache_ptr->image_ctl.flags & H5C_CI__SUPRESS_ENTRY_WRITES)
            suppress_image_entry_writes = TRUE;
    } /* end if */

    /* run initial sanity checks */
#ifdef H5C_DO_SANITY_CHECKS
    if (cache_ptr->slist_enabled) {
        if (entry_ptr->in_slist) {
            assert(entry_ptr->is_dirty);
            if (entry_ptr->flush_marker && !entry_ptr->is_dirty)
                HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "entry in slist failed sanity checks")
        } /* end if */
        else {
            assert(!entry_ptr->is_dirty);
            assert(!entry_ptr->flush_marker);
            if (entry_ptr->is_dirty || entry_ptr->flush_marker)
                HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "entry failed sanity checks")
        } /* end else */
    }
    else { /* slist is disabled */
        assert(!entry_ptr->in_slist);
        if (!entry_ptr->is_dirty)
            if (entry_ptr->flush_marker)
                HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "flush marked clean entry?")
    }
#endif /* H5C_DO_SANITY_CHECKS */

    if (entry_ptr->is_protected)
        /* Attempt to flush a protected entry -- scream and die. */
        HGOTO_ERROR(H5E_CACHE, H5E_PROTECT, FAIL, "Attempt to flush a protected entry")

    /* Set entry_ptr->flush_in_progress = TRUE and set
     * entry_ptr->flush_marker = FALSE
     *
     * We will set flush_in_progress back to FALSE at the end if the
     * entry still exists at that point.
     */
    entry_ptr->flush_in_progress = TRUE;
    entry_ptr->flush_marker      = FALSE;

    /* Preserve current dirty state for later */
    was_dirty = entry_ptr->is_dirty;

    /* The entry is dirty, and we are doing a flush, a flush destroy or have
     * been requested to generate an image.  In those cases, serialize the
     * entry.
     */
    if (write_entry || generate_image) {
        assert(entry_ptr->is_dirty);
        if (NULL == entry_ptr->image_ptr) {
            if (NULL == (entry_ptr->image_ptr = H5MM_malloc(entry_ptr->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
            H5MM_memcpy(((uint8_t *)entry_ptr->image_ptr) + entry_ptr->size, H5C_IMAGE_SANITY_VALUE,
                        H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

        } /* end if */

        if (!entry_ptr->image_up_to_date) {
            /* Sanity check */
            assert(!entry_ptr->prefetched);

            /* Generate the entry's image */
            if (H5C__generate_image(f, cache_ptr, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, FAIL, "can't generate entry's image")
        } /* end if ( ! (entry_ptr->image_up_to_date) ) */
    }     /* end if */

    /* Finally, write the image to disk.
     *
     * Note that if the H5AC__CLASS_SKIP_WRITES flag is set in the
     * in the entry's type, we silently skip the write.  This
     * flag should only be used in test code.
     */
    if (write_entry) {
        assert(entry_ptr->is_dirty);

#ifdef H5C_DO_SANITY_CHECKS
        if (cache_ptr->check_write_permitted && !cache_ptr->write_permitted)
            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Write when writes are always forbidden!?!?!")
#endif /* H5C_DO_SANITY_CHECKS */

        /* Write the image to disk unless the write is suppressed.
         *
         * This happens if both suppress_image_entry_writes and
         * entry_ptr->include_in_image are TRUE, or if the
         * H5AC__CLASS_SKIP_WRITES is set in the entry's type.  This
         * flag should only be used in test code
         */
        if ((!suppress_image_entry_writes || !entry_ptr->include_in_image) &&
            ((entry_ptr->type->flags & H5C__CLASS_SKIP_WRITES) == 0)) {
            H5FD_mem_t mem_type = H5FD_MEM_DEFAULT;

#ifdef H5_HAVE_PARALLEL
            if (cache_ptr->coll_write_list) {
                if (H5SL_insert(cache_ptr->coll_write_list, entry_ptr, &entry_ptr->addr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTINSERT, FAIL, "unable to insert skip list item")
            } /* end if */
            else {
#endif /* H5_HAVE_PARALLEL */
                if (entry_ptr->prefetched) {
                    assert(entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID);
                    mem_type = cache_ptr->class_table_ptr[entry_ptr->prefetch_type_id]->mem_type;
                } /* end if */
                else
                    mem_type = entry_ptr->type->mem_type;

                if (H5F_block_write(f, mem_type, entry_ptr->addr, entry_ptr->size, entry_ptr->image_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "Can't write image to file")
#ifdef H5_HAVE_PARALLEL
            }
#endif    /* H5_HAVE_PARALLEL */
        } /* end if */

        /* if the entry has a notify callback, notify it that we have
         * just flushed the entry.
         */
        if (entry_ptr->type->notify &&
            (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_AFTER_FLUSH, entry_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client of entry flush")
    } /* if ( write_entry ) */

    /* At this point, all pre-serialize and serialize calls have been
     * made if it was appropriate to make them.  Similarly, the entry
     * has been written to disk if desired.
     *
     * Thus it is now safe to update the cache data structures for the
     * flush.
     */

    /* start by updating the statistics */
    if (clear_only) {
        /* only log a clear if the entry was dirty */
        if (was_dirty)
            H5C__UPDATE_STATS_FOR_CLEAR(cache_ptr, entry_ptr)
    }
    else if (write_entry) {
        assert(was_dirty);

        /* only log a flush if we actually wrote to disk */
        H5C__UPDATE_STATS_FOR_FLUSH(cache_ptr, entry_ptr)
    } /* end else if */

    /* Note that the algorithm below is (very) similar to the set of operations
     * in H5C_remove_entry() and should be kept in sync with changes
     * to that code. - QAK, 2016/11/30
     */

    /* Update the cache internal data structures. */
    if (destroy) {
        /* Sanity checks */
        if (take_ownership)
            assert(!destroy_entry);
        else
            assert(destroy_entry);

        assert(!entry_ptr->is_pinned);

        /* Update stats, while entry is still in the cache */
        H5C__UPDATE_STATS_FOR_EVICTION(cache_ptr, entry_ptr, take_ownership)

        /* If the entry's type has a 'notify' callback and the entry is about
         * to be removed from the cache, send a 'before eviction' notice while
         * the entry is still fully integrated in the cache.
         */
        if (entry_ptr->type->notify &&
            (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_BEFORE_EVICT, entry_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry to evict")

        /* Update the cache internal data structures as appropriate
         * for a destroy.  Specifically:
         *
         * 1) Delete it from the index
         *
         * 2) Delete it from the skip list if requested.
         *
         * 3) Delete it from the collective read access list.
         *
         * 4) Update the replacement policy for eviction
         *
         * 5) Remove it from the tag list for this object
         *
         * Finally, if the destroy_entry flag is set, discard the
         * entry.
         */
        H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr, FAIL);

        if (entry_ptr->in_slist && del_from_slist_on_destroy)
            H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr, during_flush, FAIL)

#ifdef H5_HAVE_PARALLEL
        /* Check for collective read access flag */
        if (entry_ptr->coll_access) {
            entry_ptr->coll_access = FALSE;
            H5C__REMOVE_FROM_COLL_LIST(cache_ptr, entry_ptr, FAIL)
        } /* end if */
#endif    /* H5_HAVE_PARALLEL */

        H5C__UPDATE_RP_FOR_EVICTION(cache_ptr, entry_ptr, FAIL)

        /* Remove entry from tag list */
        if (H5C__untag_entry(cache_ptr, entry_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove entry from tag list")

        /* verify that the entry is no longer part of any flush dependencies */
        assert(entry_ptr->flush_dep_nparents == 0);
        assert(entry_ptr->flush_dep_nchildren == 0);
    } /* end if */
    else {
        assert(clear_only || write_entry);
        assert(entry_ptr->is_dirty);
        assert((!cache_ptr->slist_enabled) || (entry_ptr->in_slist));

        /* We are either doing a flush or a clear.
         *
         * A clear and a flush are the same from the point of
         * view of the replacement policy and the slist.
         * Hence no differentiation between them.
         */
        H5C__UPDATE_RP_FOR_FLUSH(cache_ptr, entry_ptr, FAIL)
        H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr, during_flush, FAIL)

        /* mark the entry as clean and update the index for
         * entry clean.  Also, call the clear callback
         * if defined.
         */
        entry_ptr->is_dirty = FALSE;

        H5C__UPDATE_INDEX_FOR_ENTRY_CLEAN(cache_ptr, entry_ptr, FAIL);

        /* Check for entry changing status and do notifications, etc. */
        if (was_dirty) {
            /* If the entry's type has a 'notify' callback send a
             * 'entry cleaned' notice now that the entry is fully
             * integrated into the cache.
             */
            if (entry_ptr->type->notify &&
                (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_CLEANED, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                            "can't notify client about entry dirty flag cleared")

            /* Propagate the clean flag up the flush dependency chain
             * if appropriate
             */
            if (entry_ptr->flush_dep_ndirty_children != 0)
                assert(entry_ptr->flush_dep_ndirty_children == 0);
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_clean(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKCLEAN, FAIL, "Can't propagate flush dep clean flag")
        } /* end if */
    }     /* end else */

    /* reset the flush_in progress flag */
    entry_ptr->flush_in_progress = FALSE;

    /* capture the cache entry address for the log_flush call at the
     * end before the entry_ptr gets freed
     */
    entry_addr = entry_ptr->addr;

    /* Internal cache data structures should now be up to date, and
     * consistent with the status of the entry.
     *
     * Now discard the entry if appropriate.
     */
    if (destroy) {
        /* Sanity check */
        assert(0 == entry_ptr->flush_dep_nparents);

        /* if both suppress_image_entry_frees and entry_ptr->include_in_image
         * are true, simply set entry_ptr->image_ptr to NULL, as we have
         * another pointer to the buffer in an instance of H5C_image_entry_t
         * in cache_ptr->image_entries.
         *
         * Otherwise, free the buffer if it exists.
         */
        if (suppress_image_entry_frees && entry_ptr->include_in_image)
            entry_ptr->image_ptr = NULL;
        else if (entry_ptr->image_ptr != NULL)
            entry_ptr->image_ptr = H5MM_xfree(entry_ptr->image_ptr);

        /* If the entry is not a prefetched entry, verify that the flush
         * dependency parents addresses array has been transferred.
         *
         * If the entry is prefetched, the free_isr routine will dispose of
         * the flush dependency parents addresses array if necessary.
         */
        if (!entry_ptr->prefetched) {
            assert(0 == entry_ptr->fd_parent_count);
            assert(NULL == entry_ptr->fd_parent_addrs);
        } /* end if */

        /* Check whether we should free the space in the file that
         * the entry occupies
         */
        if (free_file_space) {
            hsize_t fsf_size;

            /* Sanity checks */
            assert(H5_addr_defined(entry_ptr->addr));
            assert(!H5F_IS_TMP_ADDR(f, entry_ptr->addr));
#ifndef NDEBUG
            {
                size_t curr_len;

                /* Get the actual image size for the thing again */
                entry_ptr->type->image_len((void *)entry_ptr, &curr_len);
                assert(curr_len == entry_ptr->size);
            }
#endif

            /* If the file space free size callback is defined, use
             * it to get the size of the block of file space to free.
             * Otherwise use entry_ptr->size.
             */
            if (entry_ptr->type->fsf_size) {
                if ((entry_ptr->type->fsf_size)((void *)entry_ptr, &fsf_size) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTFREE, FAIL, "unable to get file space free size")
            }    /* end if */
            else /* no file space free size callback -- use entry size */
                fsf_size = entry_ptr->size;

            /* Release the space on disk */
            if (H5MF_xfree(f, entry_ptr->type->mem_type, entry_ptr->addr, fsf_size) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTFREE, FAIL, "unable to free file space for cache entry")
        } /* end if ( free_file_space ) */

        /* Reset the pointer to the cache the entry is within. -QAK */
        entry_ptr->cache_ptr = NULL;

        /* increment entries_removed_counter and set
         * last_entry_removed_ptr.  As we are likely abuut to
         * free the entry, recall that last_entry_removed_ptr
         * must NEVER be dereferenced.
         *
         * Recall that these fields are maintained to allow functions
         * that perform scans of lists of entries to detect the
         * unexpected removal of entries (via expunge, eviction,
         * or take ownership at present), so that they can re-start
         * their scans if necessary.
         *
         * Also check if the entry we are watching for removal is being
         * removed (usually the 'next' entry for an iteration) and reset
         * it to indicate that it was removed.
         */
        cache_ptr->entries_removed_counter++;
        cache_ptr->last_entry_removed_ptr = entry_ptr;

        if (entry_ptr == cache_ptr->entry_watched_for_removal)
            cache_ptr->entry_watched_for_removal = NULL;

        /* Check for actually destroying the entry in memory */
        /* (As opposed to taking ownership of it) */
        if (destroy_entry) {
            if (entry_ptr->is_dirty) {
                /* Reset dirty flag */
                entry_ptr->is_dirty = FALSE;

                /* If the entry's type has a 'notify' callback send a
                 * 'entry cleaned' notice now that the entry is fully
                 * integrated into the cache.
                 */
                if (entry_ptr->type->notify &&
                    (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_CLEANED, entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                                "can't notify client about entry dirty flag cleared")
            } /* end if */

            /* verify that the image has been freed */
            assert(entry_ptr->image_ptr == NULL);

            if (entry_ptr->type->free_icr((void *)entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "free_icr callback failed")
        } /* end if */
        else {
            assert(take_ownership);
        } /* end else */
    }     /* if (destroy) */

    /* Check if we have to update the page buffer with cleared entries
     * so it doesn't go out of date
     */
    if (update_page_buffer) {
        /* Sanity check */
        assert(!destroy);
        assert(entry_ptr->image_ptr);

        if (f->shared->page_buf && (f->shared->page_buf->page_size >= entry_ptr->size))
            if (H5PB_update_entry(f->shared->page_buf, entry_ptr->addr, entry_ptr->size,
                                  entry_ptr->image_ptr) > 0)
                HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "Failed to update PB with metadata cache")
    } /* end if */

    if (cache_ptr->log_flush)
        if ((cache_ptr->log_flush)(cache_ptr, entry_addr, was_dirty, flags) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "log_flush callback failed")

done:
    assert((ret_value != SUCCEED) || (destroy_entry) || (!entry_ptr->flush_in_progress));
    assert((ret_value != SUCCEED) || (destroy_entry) || (take_ownership) || (!entry_ptr->is_dirty));

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__flush_single_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C__verify_len_eoa
 *
 * Purpose:     Verify that 'len' does not exceed eoa when 'actual' is
 *              false i.e. 'len" is the initial speculative length from
 *              get_load_size callback with null image pointer.
 *              If exceed, adjust 'len' accordingly.
 *
 *              Verify that 'len' should not exceed eoa when 'actual' is
 *              true i.e. 'len' is the actual length from get_load_size
 *              callback with non-null image pointer.
 *              If exceed, return error.
 *
 * Return:      FAIL if error is detected, SUCCEED otherwise.
 *
 * Programmer:  Vailin Choi
 *              9/6/15
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__verify_len_eoa(H5F_t *f, const H5C_class_t *type, haddr_t addr, size_t *len, hbool_t actual)
{
    H5FD_mem_t cooked_type;         /* Modified type, accounting for switching global heaps */
    haddr_t    eoa;                 /* End-of-allocation in the file */
    herr_t     ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* if type == H5FD_MEM_GHEAP, H5F_block_read() forces
     * type to H5FD_MEM_DRAW via its call to H5F__accum_read().
     * Thus we do the same for purposes of computing the EOA
     * for sanity checks.
     */
    cooked_type = (type->mem_type == H5FD_MEM_GHEAP) ? H5FD_MEM_DRAW : type->mem_type;

    /* Get the file's end-of-allocation value */
    eoa = H5F_get_eoa(f, cooked_type);
    if (!H5_addr_defined(eoa))
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "invalid EOA address for file")

    /* Check for bad address in general */
    if (H5_addr_gt(addr, eoa))
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "address of object past end of allocation")

    /* Check if the amount of data to read will be past the EOA */
    if (H5_addr_gt((addr + *len), eoa)) {
        if (actual)
            HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "actual len exceeds EOA")
        else
            /* Trim down the length of the metadata */
            *len = (size_t)(eoa - addr);
    } /* end if */

    if (*len <= 0)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "len not positive after adjustment for EOA")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__verify_len_eoa() */

/*-------------------------------------------------------------------------
 * Function:    H5C__load_entry
 *
 * Purpose:     Attempt to load the entry at the specified disk address
 *              and with the specified type into memory.  If successful.
 *              return the in memory address of the entry.  Return NULL
 *              on failure.
 *
 *              Note that this function simply loads the entry into
 *              core.  It does not insert it into the cache.
 *
 * Return:      Non-NULL on success / NULL on failure.
 *
 * Programmer:  John Mainzer, 5/18/04
 *
 *-------------------------------------------------------------------------
 */
void *
H5C__load_entry(H5F_t *f,
#ifdef H5_HAVE_PARALLEL
                hbool_t coll_access,
#endif /* H5_HAVE_PARALLEL */
                const H5C_class_t *type, haddr_t addr, void *udata)
{
    hbool_t            dirty = FALSE; /* Flag indicating whether thing was dirtied during deserialize */
    uint8_t           *image = NULL;  /* Buffer for disk image                    */
    void              *thing = NULL;  /* Pointer to thing loaded                  */
    H5C_cache_entry_t *entry = NULL;  /* Alias for thing loaded, as cache entry   */
    size_t             len;           /* Size of image in file                    */
#ifdef H5_HAVE_PARALLEL
    int      mpi_rank = 0;             /* MPI process rank                         */
    MPI_Comm comm     = MPI_COMM_NULL; /* File MPI Communicator                    */
    int      mpi_code;                 /* MPI error code                           */
#endif                                 /* H5_HAVE_PARALLEL */
    void *ret_value = NULL;            /* Return value                             */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(f);
    assert(f->shared);
    assert(f->shared->cache);
    assert(type);
    assert(H5_addr_defined(addr));
    assert(type->get_initial_load_size);
    if (type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG)
        assert(type->get_final_load_size);
    else
        assert(NULL == type->get_final_load_size);
    assert(type->deserialize);

    /* Can't see how skip reads could be usefully combined with
     * the speculative read flag.  Hence disallow.
     */
    assert(!((type->flags & H5C__CLASS_SKIP_READS) && (type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG)));

    /* Call the get_initial_load_size callback, to retrieve the initial size of image */
    if (type->get_initial_load_size(udata, &len) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, NULL, "can't retrieve image size")
    assert(len > 0);

    /* Check for possible speculative read off the end of the file */
    if (type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG)
        if (H5C__verify_len_eoa(f, type, addr, &len, FALSE) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "invalid len with respect to EOA")

    /* Allocate the buffer for reading the on-disk entry image */
    if (NULL == (image = (uint8_t *)H5MM_malloc(len + 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
    H5MM_memcpy(image + len, H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

#ifdef H5_HAVE_PARALLEL
    if (H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI)) {
        if ((mpi_rank = H5F_mpi_get_rank(f)) < 0)
            HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "Can't get MPI rank")
        if ((comm = H5F_mpi_get_comm(f)) == MPI_COMM_NULL)
            HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "get_comm request failed")
    }  /* end if */
#endif /* H5_HAVE_PARALLEL */

    /* Get the on-disk entry image */
    if (0 == (type->flags & H5C__CLASS_SKIP_READS)) {
        unsigned tries, max_tries;   /* The # of read attempts               */
        unsigned retries;            /* The # of retries                     */
        htri_t   chk_ret;            /* return from verify_chksum callback   */
        size_t   actual_len = len;   /* The actual length, after speculative reads have been resolved */
        uint64_t nanosec    = 1;     /* # of nanoseconds to sleep between retries */
        void    *new_image;          /* Pointer to image                     */
        hbool_t  len_changed = TRUE; /* Whether to re-check speculative entries */

        /* Get the # of read attempts */
        max_tries = tries = H5F_GET_READ_ATTEMPTS(f);

        /*
         * This do/while loop performs the following till the metadata checksum
         * is correct or the file's number of allowed read attempts are reached.
         *   --read the metadata
         *   --determine the actual size of the metadata
         *   --perform checksum verification
         */
        do {
            if (actual_len != len) {
                if (NULL == (new_image = H5MM_realloc(image, len + H5C_IMAGE_EXTRA_SPACE)))
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, "image null after H5MM_realloc()")
                image = (uint8_t *)new_image;
#if H5C_DO_MEMORY_SANITY_CHECKS
                H5MM_memcpy(image + len, H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE);
#endif        /* H5C_DO_MEMORY_SANITY_CHECKS */
            } /* end if */

#ifdef H5_HAVE_PARALLEL
            if (!coll_access || 0 == mpi_rank) {
#endif /* H5_HAVE_PARALLEL */
                if (H5F_block_read(f, type->mem_type, addr, len, image) < 0) {
#ifdef H5_HAVE_PARALLEL
                    if (coll_access) {
                        /* Push an error, but still participate in following MPI_Bcast */
                        HDmemset(image, 0, len);
                        HDONE_ERROR(H5E_CACHE, H5E_READERROR, NULL, "Can't read image*")
                    }
                    else
#endif
                        HGOTO_ERROR(H5E_CACHE, H5E_READERROR, NULL, "Can't read image*")
                }

#ifdef H5_HAVE_PARALLEL
            } /* end if */
            /* if the collective metadata read optimization is turned on,
             * bcast the metadata read from process 0 to all ranks in the file
             * communicator
             */
            if (coll_access) {
                int buf_size;

                H5_CHECKED_ASSIGN(buf_size, int, len, size_t);
                if (MPI_SUCCESS != (mpi_code = MPI_Bcast(image, buf_size, MPI_BYTE, 0, comm)))
                    HMPI_GOTO_ERROR(NULL, "MPI_Bcast failed", mpi_code)
            } /* end if */
#endif        /* H5_HAVE_PARALLEL */

            /* If the entry could be read speculatively and the length is still
             *  changing, check for updating the actual size
             */
            if ((type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG) && len_changed) {
                /* Retrieve the actual length */
                actual_len = len;
                if (type->get_final_load_size(image, len, udata, &actual_len) < 0)
                    continue; /* Transfer control to while() and count towards retries */

                /* Check for the length changing */
                if (actual_len != len) {
                    /* Verify that the length isn't past the EOA for the file */
                    if (H5C__verify_len_eoa(f, type, addr, &actual_len, TRUE) < 0)
                        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "actual_len exceeds EOA")

                    /* Expand buffer to new size */
                    if (NULL == (new_image = H5MM_realloc(image, actual_len + H5C_IMAGE_EXTRA_SPACE)))
                        HGOTO_ERROR(H5E_CACHE, H5E_CANTALLOC, NULL, "image null after H5MM_realloc()")
                    image = (uint8_t *)new_image;
#if H5C_DO_MEMORY_SANITY_CHECKS
                    H5MM_memcpy(image + actual_len, H5C_IMAGE_SANITY_VALUE, H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */

                    if (actual_len > len) {
#ifdef H5_HAVE_PARALLEL
                        if (!coll_access || 0 == mpi_rank) {
#endif /* H5_HAVE_PARALLEL */
                            /* If the thing's image needs to be bigger for a speculatively
                             * loaded thing, go get the on-disk image again (the extra portion).
                             */
                            if (H5F_block_read(f, type->mem_type, addr + len, actual_len - len, image + len) <
                                0) {
#ifdef H5_HAVE_PARALLEL
                                if (coll_access) {
                                    /* Push an error, but still participate in following MPI_Bcast */
                                    HDmemset(image + len, 0, actual_len - len);
                                    HDONE_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "can't read image")
                                }
                                else
#endif
                                    HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "can't read image")
                            }

#ifdef H5_HAVE_PARALLEL
                        }
                        /* If the collective metadata read optimization is turned on,
                         * Bcast the metadata read from process 0 to all ranks in the file
                         * communicator */
                        if (coll_access) {
                            int buf_size;

                            H5_CHECKED_ASSIGN(buf_size, int, actual_len - len, size_t);
                            if (MPI_SUCCESS !=
                                (mpi_code = MPI_Bcast(image + len, buf_size, MPI_BYTE, 0, comm)))
                                HMPI_GOTO_ERROR(NULL, "MPI_Bcast failed", mpi_code)
                        } /* end if */
#endif                    /* H5_HAVE_PARALLEL */
                    }     /* end if */
                }         /* end if (actual_len != len) */
                else {
                    /* The length has stabilized */
                    len_changed = FALSE;

                    /* Set the final length */
                    len = actual_len;
                } /* else */
            }     /* end if */

            /* If there's no way to verify the checksum for a piece of metadata
             * (usually because there's no checksum in the file), leave now
             */
            if (type->verify_chksum == NULL)
                break;

            /* Verify the checksum for the metadata image */
            if ((chk_ret = type->verify_chksum(image, actual_len, udata)) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, NULL, "failure from verify_chksum callback")
            if (chk_ret == TRUE)
                break;

            /* Sleep for some time */
            H5_nanosleep(nanosec);
            nanosec *= 2; /* Double the sleep time next time */
        } while (--tries);

        /* Check for too many tries */
        if (tries == 0)
            HGOTO_ERROR(H5E_CACHE, H5E_READERROR, NULL, "incorrect metadata checksum after all read attempts")

        /* Calculate and track the # of retries */
        retries = max_tries - tries;
        if (retries) /* Does not track 0 retry */
            if (H5F_track_metadata_read_retries(f, (unsigned)type->mem_type, retries) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, NULL, "cannot track read tries = %u ", retries)

        /* Set the final length (in case it wasn't set earlier) */
        len = actual_len;
    } /* end if !H5C__CLASS_SKIP_READS */

    /* Deserialize the on-disk image into the native memory form */
    if (NULL == (thing = type->deserialize(image, len, udata, &dirty)))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "Can't deserialize image")

    entry = (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:
     *
     *     assert( ( 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.
     */

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

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

    entry->ring = H5C_RING_UNDEFINED;

    /* Initialize flush dependency fields */
    entry->flush_dep_parent          = NULL;
    entry->flush_dep_nparents        = 0;
    entry->flush_dep_parent_nalloc   = 0;
    entry->flush_dep_nchildren       = 0;
    entry->flush_dep_ndirty_children = 0;
    entry->flush_dep_nunser_children = 0;
    entry->ht_next                   = NULL;
    entry->ht_prev                   = NULL;
    entry->il_next                   = NULL;
    entry->il_prev                   = NULL;

    entry->next = NULL;
    entry->prev = NULL;

#if H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS
    entry->aux_next = NULL;
    entry->aux_prev = NULL;
#endif /* H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS */

#ifdef H5_HAVE_PARALLEL
    entry->coll_next = NULL;
    entry->coll_prev = NULL;
#endif /* H5_HAVE_PARALLEL */

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

    /* initialize tag list fields */
    entry->tl_next  = NULL;
    entry->tl_prev  = NULL;
    entry->tag_info = NULL;

    H5C__RESET_CACHE_ENTRY_STATS(entry);

    ret_value = thing;

done:
    /* Cleanup on error */
    if (NULL == ret_value) {
        /* Release resources */
        if (thing && type->free_icr(thing) < 0)
            HDONE_ERROR(H5E_CACHE, H5E_CANTFLUSH, NULL, "free_icr callback failed")
        if (image)
            image = (uint8_t *)H5MM_xfree(image);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__load_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C__mark_flush_dep_dirty()
 *
 * Purpose:     Recursively propagate the flush_dep_ndirty_children flag
 *              up the dependency chain in response to entry either
 *              becoming dirty or having its flush_dep_ndirty_children
 *              increased from 0.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Neil Fortner
 *              11/13/12
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__mark_flush_dep_dirty(H5C_cache_entry_t *entry)
{
    unsigned u;                   /* Local index variable */
    herr_t   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(entry);

    /* Iterate over the parent entries, if any */
    for (u = 0; u < entry->flush_dep_nparents; u++) {
        /* Sanity check */
        assert(entry->flush_dep_parent[u]->flush_dep_ndirty_children <
               entry->flush_dep_parent[u]->flush_dep_nchildren);

        /* Adjust the parent's number of dirty children */
        entry->flush_dep_parent[u]->flush_dep_ndirty_children++;

        /* If the parent has a 'notify' callback, send a 'child entry dirtied' notice */
        if (entry->flush_dep_parent[u]->type->notify &&
            (entry->flush_dep_parent[u]->type->notify)(H5C_NOTIFY_ACTION_CHILD_DIRTIED,
                                                       entry->flush_dep_parent[u]) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry dirty flag set")
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__mark_flush_dep_dirty() */

/*-------------------------------------------------------------------------
 * Function:    H5C__mark_flush_dep_clean()
 *
 * Purpose:     Recursively propagate the flush_dep_ndirty_children flag
 *              up the dependency chain in response to entry either
 *              becoming clean or having its flush_dep_ndirty_children
 *              reduced to 0.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Neil Fortner
 *              11/13/12
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__mark_flush_dep_clean(H5C_cache_entry_t *entry)
{
    int    i;                   /* Local index variable */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(entry);

    /* Iterate over the parent entries, if any */
    /* Note reverse iteration order, in case the callback removes the flush
     *  dependency - QAK, 2017/08/12
     */
    for (i = ((int)entry->flush_dep_nparents) - 1; i >= 0; i--) {
        /* Sanity check */
        assert(entry->flush_dep_parent[i]->flush_dep_ndirty_children > 0);

        /* Adjust the parent's number of dirty children */
        entry->flush_dep_parent[i]->flush_dep_ndirty_children--;

        /* If the parent has a 'notify' callback, send a 'child entry cleaned' notice */
        if (entry->flush_dep_parent[i]->type->notify &&
            (entry->flush_dep_parent[i]->type->notify)(H5C_NOTIFY_ACTION_CHILD_CLEANED,
                                                       entry->flush_dep_parent[i]) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry dirty flag reset")
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__mark_flush_dep_clean() */

/*-------------------------------------------------------------------------
 * Function:    H5C__mark_flush_dep_serialized()
 *
 * Purpose:     Decrement the flush_dep_nunser_children fields of all the
 *        target entry's flush dependency parents in response to
 *        the target entry becoming serialized.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/30/16
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__mark_flush_dep_serialized(H5C_cache_entry_t *entry_ptr)
{
    int    i;                   /* Local index variable */
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(entry_ptr);

    /* Iterate over the parent entries, if any */
    /* Note reverse iteration order, in case the callback removes the flush
     *  dependency - QAK, 2017/08/12
     */
    for (i = ((int)entry_ptr->flush_dep_nparents) - 1; i >= 0; i--) {
        /* Sanity checks */
        assert(entry_ptr->flush_dep_parent);
        assert(entry_ptr->flush_dep_parent[i]->flush_dep_nunser_children > 0);

        /* decrement the parents number of unserialized children */
        entry_ptr->flush_dep_parent[i]->flush_dep_nunser_children--;

        /* If the parent has a 'notify' callback, send a 'child entry serialized' notice */
        if (entry_ptr->flush_dep_parent[i]->type->notify &&
            (entry_ptr->flush_dep_parent[i]->type->notify)(H5C_NOTIFY_ACTION_CHILD_SERIALIZED,
                                                           entry_ptr->flush_dep_parent[i]) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry serialized flag set")
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__mark_flush_dep_serialized() */

/*-------------------------------------------------------------------------
 * Function:    H5C__mark_flush_dep_unserialized()
 *
 * Purpose:     Increment the flush_dep_nunser_children fields of all the
 *              target entry's flush dependency parents in response to
 *              the target entry becoming unserialized.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              8/30/16
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5C__mark_flush_dep_unserialized(H5C_cache_entry_t *entry_ptr)
{
    unsigned u;                   /* Local index variable */
    herr_t   ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(entry_ptr);

    /* Iterate over the parent entries, if any */
    for (u = 0; u < entry_ptr->flush_dep_nparents; u++) {
        /* Sanity check */
        assert(entry_ptr->flush_dep_parent);
        assert(entry_ptr->flush_dep_parent[u]->flush_dep_nunser_children <
               entry_ptr->flush_dep_parent[u]->flush_dep_nchildren);

        /* increment parents number of usserialized children */
        entry_ptr->flush_dep_parent[u]->flush_dep_nunser_children++;

        /* If the parent has a 'notify' callback, send a 'child entry unserialized' notice */
        if (entry_ptr->flush_dep_parent[u]->type->notify &&
            (entry_ptr->flush_dep_parent[u]->type->notify)(H5C_NOTIFY_ACTION_CHILD_UNSERIALIZED,
                                                           entry_ptr->flush_dep_parent[u]) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry serialized flag reset")
    } /* end for */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__mark_flush_dep_unserialized() */

#ifndef NDEBUG
/*-------------------------------------------------------------------------
 * Function:    H5C__assert_flush_dep_nocycle()
 *
 * Purpose:     Assert recursively that base_entry is not the same as
 *              entry, and perform the same assertion on all of entry's
 *              flush dependency parents.  This is used to detect cycles
 *              created by flush dependencies.
 *
 * Return:      void
 *
 * Programmer:  Neil Fortner
 *              12/10/12
 *
 *-------------------------------------------------------------------------
 */
static void
H5C__assert_flush_dep_nocycle(const H5C_cache_entry_t *entry, const H5C_cache_entry_t *base_entry)
{
    unsigned u; /* Local index variable */

    FUNC_ENTER_PACKAGE_NOERR

    /* Sanity checks */
    assert(entry);
    assert(base_entry);

    /* Make sure the entries are not the same */
    assert(base_entry != entry);

    /* Iterate over entry's parents (if any) */
    for (u = 0; u < entry->flush_dep_nparents; u++)
        H5C__assert_flush_dep_nocycle(entry->flush_dep_parent[u], base_entry);

    FUNC_LEAVE_NOAPI_VOID
} /* H5C__assert_flush_dep_nocycle() */
#endif

/*-------------------------------------------------------------------------
 * Function:    H5C__serialize_single_entry
 *
 * Purpose:     Serialize the cache entry pointed to by the entry_ptr
 *        parameter.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer, 7/24/15
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C__serialize_single_entry(H5F_t *f, H5C_t *cache_ptr, H5C_cache_entry_t *entry_ptr)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(f);
    assert(cache_ptr);
    assert(entry_ptr);
    assert(!entry_ptr->prefetched);
    assert(!entry_ptr->image_up_to_date);
    assert(entry_ptr->is_dirty);
    assert(!entry_ptr->is_protected);
    assert(!entry_ptr->flush_in_progress);
    assert(entry_ptr->type);

    /* Set entry_ptr->flush_in_progress to TRUE so the target entry
     * will not be evicted out from under us.  Must set it back to FALSE
     * when we are done.
     */
    entry_ptr->flush_in_progress = TRUE;

    /* Allocate buffer for the entry image if required. */
    if (NULL == entry_ptr->image_ptr) {
        assert(entry_ptr->size > 0);
        if (NULL == (entry_ptr->image_ptr = H5MM_malloc(entry_ptr->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
        H5MM_memcpy(((uint8_t *)entry_ptr->image_ptr) + image_size, H5C_IMAGE_SANITY_VALUE,
                    H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */
    }  /* end if */

    /* Generate image for entry */
    if (H5C__generate_image(f, cache_ptr, entry_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTSERIALIZE, FAIL, "Can't generate image for cache entry")

    /* Reset the flush_in progress flag */
    entry_ptr->flush_in_progress = FALSE;

done:
    assert((ret_value != SUCCEED) || (!entry_ptr->flush_in_progress));
    assert((ret_value != SUCCEED) || (entry_ptr->image_up_to_date));
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__serialize_single_entry() */

/*-------------------------------------------------------------------------
 * 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;
#ifndef NDEBUG
    unsigned entries_visited = 0;
#endif
    int     fd_children_found = 0;
    hbool_t found;
    herr_t  ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity checks */
    assert(cache_ptr);
    assert(pf_entry_ptr);
    assert(pf_entry_ptr->type);
    assert(pf_entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID);
    assert(pf_entry_ptr->prefetched);
    assert(pf_entry_ptr->fd_child_count > 0);
    assert(fd_children);

    /* Scan each entry on the index list */
    entry_ptr = cache_ptr->il_head;
    while (entry_ptr != NULL) {
        /* 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 */
            assert(entry_ptr->type);
            assert(entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID);
            assert(entry_ptr->fd_parent_count >= entry_ptr->flush_dep_nparents);
            assert(entry_ptr->fd_parent_addrs);
            assert(entry_ptr->flush_dep_parent);

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

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

                u++;
            } /* end while */

            if (found) {
                assert(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 */
                assert(found);
#endif
            } /* end if */
        }     /* end if */

#ifndef NDEBUG
        entries_visited++;
#endif
        entry_ptr = entry_ptr->il_next;
    } /* end while */

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

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

/*-------------------------------------------------------------------------
 * 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
 *
 *-------------------------------------------------------------------------
 */
static 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 */
    assert(f);
    assert(f->shared);
    assert(f->shared->cache);
    assert(f->shared->cache == cache_ptr);
    assert(entry_ptr_ptr);
    assert(*entry_ptr_ptr);
    pf_entry_ptr = *entry_ptr_ptr;
    assert(pf_entry_ptr->type);
    assert(pf_entry_ptr->type->id == H5AC_PREFETCHED_ENTRY_ID);
    assert(pf_entry_ptr->prefetched);
    assert(pf_entry_ptr->image_up_to_date);
    assert(pf_entry_ptr->image_ptr);
    assert(pf_entry_ptr->size > 0);
    assert(pf_entry_ptr->addr == addr);
    assert(type);
    assert(type->id == pf_entry_ptr->prefetch_type_id);
    assert(type->mem_type == cache_ptr->class_table_ptr[type->id]->mem_type);

    /* verify absence of prohibited or unsupported type flag combinations */
    assert(!(type->flags & H5C__CLASS_SKIP_READS));

    /* Can't see how skip reads could be usefully combined with
     * either the speculative read flag.  Hence disallow.
     */
    assert(!((type->flags & H5C__CLASS_SKIP_READS) && (type->flags & H5C__CLASS_SPECULATIVE_LOAD_FLAG)));
    assert(H5_addr_defined(addr));
    assert(type->get_initial_load_size);
    assert(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.
     */
    assert(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--) {
        assert(pf_entry_ptr->flush_dep_parent);
        assert(pf_entry_ptr->flush_dep_parent[i]);
        assert(pf_entry_ptr->flush_dep_parent[i]->flush_dep_nchildren > 0);
        assert(pf_entry_ptr->fd_parent_addrs);
        assert(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 */
    assert(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:
     *
     * 	assert( ( 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 possibility.
     *
     * Also, note that it is possible for a prefetched entry to be dirty --
     * hence the value assigned to ds_entry_ptr->is_dirty below.
     */

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

    ds_entry_ptr->cache_ptr = f->shared->cache;
    ds_entry_ptr->addr      = addr;
    ds_entry_ptr->size      = len;
    assert(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

    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) {
        assert(((cache_ptr->slist_enabled) && (pf_entry_ptr->in_slist)) ||
               ((!cache_ptr->slist_enabled) && (!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);

    assert(NULL == pf_entry_ptr);
#endif

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

    assert(!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 */
            assert((fd_children[i])->prefetched);
            assert((fd_children[i])->fd_parent_count > 0);
            assert((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 */
                assert(found);
            }
#endif

            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 ) */
    assert((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_insert_entry
 *
 * Purpose:     Adds the specified thing to the cache.  The thing need not
 *              exist on disk yet, but it must have an address and disk
 *              space reserved.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *        6/2/04
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_insert_entry(H5F_t *f, const H5C_class_t *type, haddr_t addr, void *thing, unsigned int flags)
{
    H5C_t      *cache_ptr;
    H5AC_ring_t ring = H5C_RING_UNDEFINED;
    hbool_t     insert_pinned;
    hbool_t     flush_last;
#ifdef H5_HAVE_PARALLEL
    hbool_t coll_access = FALSE; /* whether access to the cache entry is done collectively */
#endif                           /* H5_HAVE_PARALLEL */
    hbool_t            set_flush_marker;
    hbool_t            write_permitted = TRUE;
    size_t             empty_space;
    H5C_cache_entry_t *entry_ptr = NULL;
    H5C_cache_entry_t *test_entry_ptr;
    hbool_t            entry_tagged = FALSE;
    herr_t             ret_value    = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    assert(f);
    assert(f->shared);

    cache_ptr = f->shared->cache;

    assert(cache_ptr);
    assert(type);
    assert(type->mem_type == cache_ptr->class_table_ptr[type->id]->mem_type);
    assert(type->image_len);
    assert(H5_addr_defined(addr));
    assert(thing);

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    /* no need to verify that entry is not already in the index as */
    /* we already make that check below.                           */
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    set_flush_marker = ((flags & H5C__SET_FLUSH_MARKER_FLAG) != 0);
    insert_pinned    = ((flags & H5C__PIN_ENTRY_FLAG) != 0);
    flush_last       = ((flags & H5C__FLUSH_LAST_FLAG) != 0);

    /* Get the ring type from the API context */
    ring = H5CX_get_ring();

    entry_ptr = (H5C_cache_entry_t *)thing;

    /* verify that the new entry isn't already in the hash table -- scream
     * and die if it is.
     */

    H5C__SEARCH_INDEX(cache_ptr, addr, test_entry_ptr, FAIL)

    if (test_entry_ptr != NULL) {
        if (test_entry_ptr == entry_ptr)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "entry already in cache")
        else
            HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "duplicate entry in cache")
    } /* end if */

    entry_ptr->cache_ptr = cache_ptr;
    entry_ptr->addr      = addr;
    entry_ptr->type      = type;

    entry_ptr->image_ptr        = NULL;
    entry_ptr->image_up_to_date = FALSE;

    entry_ptr->is_protected = FALSE;
    entry_ptr->is_read_only = FALSE;
    entry_ptr->ro_ref_count = 0;

    entry_ptr->is_pinned          = insert_pinned;
    entry_ptr->pinned_from_client = insert_pinned;
    entry_ptr->pinned_from_cache  = FALSE;
    entry_ptr->flush_me_last      = flush_last;

    /* newly inserted entries are assumed to be dirty */
    entry_ptr->is_dirty = TRUE;

    /* not protected, so can't be dirtied */
    entry_ptr->dirtied = FALSE;

    /* Retrieve the size of the thing */
    if ((type->image_len)(thing, &(entry_ptr->size)) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTGETSIZE, FAIL, "can't get size of thing")
    assert(entry_ptr->size > 0 && entry_ptr->size < H5C_MAX_ENTRY_SIZE);

    entry_ptr->in_slist = FALSE;

#ifdef H5_HAVE_PARALLEL
    entry_ptr->clear_on_unprotect = FALSE;
    entry_ptr->flush_immediately  = FALSE;
#endif /* H5_HAVE_PARALLEL */

    entry_ptr->flush_in_progress   = FALSE;
    entry_ptr->destroy_in_progress = FALSE;

    entry_ptr->ring = ring;

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

    entry_ptr->ht_next = NULL;
    entry_ptr->ht_prev = NULL;
    entry_ptr->il_next = NULL;
    entry_ptr->il_prev = NULL;

    entry_ptr->next = NULL;
    entry_ptr->prev = NULL;

#if H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS
    entry_ptr->aux_next = NULL;
    entry_ptr->aux_prev = NULL;
#endif /* H5C_MAINTAIN_CLEAN_AND_DIRTY_LRU_LISTS */

#ifdef H5_HAVE_PARALLEL
    entry_ptr->coll_next = NULL;
    entry_ptr->coll_prev = NULL;
#endif /* H5_HAVE_PARALLEL */

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

    /* initialize tag list fields */
    entry_ptr->tl_next  = NULL;
    entry_ptr->tl_prev  = NULL;
    entry_ptr->tag_info = NULL;

    /* Apply tag to newly inserted entry */
    if (H5C__tag_entry(cache_ptr, entry_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTTAG, FAIL, "Cannot tag metadata entry")
    entry_tagged = TRUE;

    H5C__RESET_CACHE_ENTRY_STATS(entry_ptr)

    if (cache_ptr->flash_size_increase_possible &&
        (entry_ptr->size > cache_ptr->flash_size_increase_threshold))
        if (H5C__flash_increase_cache_size(cache_ptr, 0, entry_ptr->size) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "H5C__flash_increase_cache_size failed")

    if (cache_ptr->index_size >= cache_ptr->max_cache_size)
        empty_space = 0;
    else
        empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;

    if (cache_ptr->evictions_enabled &&
        (((cache_ptr->index_size + entry_ptr->size) > cache_ptr->max_cache_size) ||
         (((empty_space + cache_ptr->clean_index_size) < cache_ptr->min_clean_size)))) {
        size_t space_needed;

        if (empty_space <= entry_ptr->size)
            cache_ptr->cache_full = TRUE;

        if (cache_ptr->check_write_permitted != NULL) {
            if ((cache_ptr->check_write_permitted)(f, &write_permitted) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "Can't get write_permitted")
        } /* end if */
        else
            write_permitted = cache_ptr->write_permitted;

        assert(entry_ptr->size <= H5C_MAX_ENTRY_SIZE);
        space_needed = entry_ptr->size;
        if (space_needed > cache_ptr->max_cache_size)
            space_needed = cache_ptr->max_cache_size;

        /* Note that space_needed is just the amount of space that
         * needed to insert the new entry without exceeding the cache
         * size limit.  The subsequent call to H5C__make_space_in_cache()
         * may evict the entries required to free more or less space
         * depending on conditions.  It MAY be less if the cache is
         * currently undersized, or more if the cache is oversized.
         *
         * The cache can exceed its maximum size limit via the following
         * mechanisms:
         *
         * First, it is possible for the cache to grow without
         * bound as long as entries are protected and not unprotected.
         *
         * Second, when writes are not permitted it is also possible
         * for the cache to grow without bound.
         *
         * Finally, we usually don't check to see if the cache is
         * oversized at the end of an unprotect.  As a result, it is
         * possible to have a vastly oversized cache with no protected
         * entries as long as all the protects precede the unprotects.
         */

        if (H5C__make_space_in_cache(f, space_needed, write_permitted) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTINS, FAIL, "H5C__make_space_in_cache failed")
    } /* end if */

    H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, FAIL);

    /* New entries are presumed to be dirty */
    assert(entry_ptr->is_dirty);
    entry_ptr->flush_marker = set_flush_marker;
    H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL);
    H5C__UPDATE_RP_FOR_INSERTION(cache_ptr, entry_ptr, FAIL)

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed just before done")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    /* If the entry's type has a 'notify' callback send a 'after insertion'
     * notice now that the entry is fully integrated into the cache.
     */
    if (entry_ptr->type->notify && (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_AFTER_INSERT, entry_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry inserted into cache")

    H5C__UPDATE_STATS_FOR_INSERTION(cache_ptr, entry_ptr)

#ifdef H5_HAVE_PARALLEL
    if (H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI))
        coll_access = H5F_get_coll_metadata_reads(f);

    entry_ptr->coll_access = coll_access;
    if (coll_access) {
        H5C__INSERT_IN_COLL_LIST(cache_ptr, entry_ptr, FAIL)

        /* Make sure the size of the collective entries in the cache remain in check */
        if (H5P_USER_TRUE == H5F_COLL_MD_READ(f)) {
            if (cache_ptr->max_cache_size * 80 < cache_ptr->coll_list_size * 100) {
                if (H5C_clear_coll_entries(cache_ptr, TRUE) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "can't clear collective metadata entries")
            } /* end if */
        }     /* end if */
        else {
            if (cache_ptr->max_cache_size * 40 < cache_ptr->coll_list_size * 100) {
                if (H5C_clear_coll_entries(cache_ptr, TRUE) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, FAIL, "can't clear collective metadata entries")
            } /* end if */
        }     /* end else */
    }         /* end if */
#endif

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    if (ret_value < 0 && entry_tagged)
        if (H5C__untag_entry(cache_ptr, entry_ptr) < 0)
            HDONE_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove entry from tag list")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_insert_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C_mark_entry_dirty
 *
 * Purpose:    Mark a pinned or protected entry as dirty.  The target entry
 *         MUST be either pinned or protected, and MAY be both.
 *
 *         In the protected case, this call is the functional
 *         equivalent of setting the H5C__DIRTIED_FLAG on an unprotect
 *         call.
 *
 *         In the pinned but not protected case, if the entry is not
 *         already dirty, the function places function marks the entry
 *         dirty and places it on the skip list.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              5/15/06
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_mark_entry_dirty(void *thing)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *entry_ptr = (H5C_cache_entry_t *)thing;
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry_ptr);
    assert(H5_addr_defined(entry_ptr->addr));
    cache_ptr = entry_ptr->cache_ptr;
    assert(cache_ptr);

    if (entry_ptr->is_protected) {
        assert(!((entry_ptr)->is_read_only));

        /* set the dirtied flag */
        entry_ptr->dirtied = TRUE;

        /* reset image_up_to_date */
        if (entry_ptr->image_up_to_date) {
            entry_ptr->image_up_to_date = FALSE;

            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_unserialized(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                                "Can't propagate serialization status to fd parents")
        } /* end if */
    }     /* end if */
    else if (entry_ptr->is_pinned) {
        hbool_t was_clean; /* Whether the entry was previously clean */
        hbool_t image_was_up_to_date;

        /* Remember previous dirty status */
        was_clean = !entry_ptr->is_dirty;

        /* Check if image is up to date */
        image_was_up_to_date = entry_ptr->image_up_to_date;

        /* Mark the entry as dirty if it isn't already */
        entry_ptr->is_dirty         = TRUE;
        entry_ptr->image_up_to_date = FALSE;

        /* Modify cache data structures */
        if (was_clean)
            H5C__UPDATE_INDEX_FOR_ENTRY_DIRTY(cache_ptr, entry_ptr, FAIL)
        if (!entry_ptr->in_slist)
            H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL);

        /* Update stats for entry being marked dirty */
        H5C__UPDATE_STATS_FOR_DIRTY_PIN(cache_ptr, entry_ptr)

        /* Check for entry changing status and do notifications, etc. */
        if (was_clean) {
            /* If the entry's type has a 'notify' callback send a 'entry dirtied'
             * notice now that the entry is fully integrated into the cache.
             */
            if (entry_ptr->type->notify &&
                (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_DIRTIED, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry dirty flag set")

            /* Propagate the dirty flag up the flush dependency chain if appropriate */
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_dirty(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL, "Can't propagate flush dep dirty flag")
        } /* end if */
        if (image_was_up_to_date)
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_unserialized(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                                "Can't propagate serialization status to fd parents")
    } /* end if */
    else
        HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL, "Entry is neither pinned nor protected??")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_mark_entry_dirty() */

/*-------------------------------------------------------------------------
 * Function:    H5C_mark_entry_clean
 *
 * Purpose:    Mark a pinned entry as clean.  The target entry MUST be pinned.
 *
 *         If the entry is not
 *         already clean, the function places function marks the entry
 *         clean and removes it from the skip list.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              7/23/16
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_mark_entry_clean(void *_thing)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *entry_ptr = (H5C_cache_entry_t *)_thing;
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry_ptr);
    assert(H5_addr_defined(entry_ptr->addr));
    cache_ptr = entry_ptr->cache_ptr;
    assert(cache_ptr);

    /* Operate on pinned entry */
    if (entry_ptr->is_protected)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKCLEAN, FAIL, "entry is protected")
    else if (entry_ptr->is_pinned) {
        hbool_t was_dirty; /* Whether the entry was previously dirty */

        /* Remember previous dirty status */
        was_dirty = entry_ptr->is_dirty;

        /* Mark the entry as clean if it isn't already */
        entry_ptr->is_dirty = FALSE;

        /* Also reset the 'flush_marker' flag, since the entry shouldn't be flushed now */
        entry_ptr->flush_marker = FALSE;

        /* Modify cache data structures */
        if (was_dirty)
            H5C__UPDATE_INDEX_FOR_ENTRY_CLEAN(cache_ptr, entry_ptr, FAIL)
        if (entry_ptr->in_slist)
            H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr, FALSE, FAIL)

        /* Update stats for entry being marked clean */
        H5C__UPDATE_STATS_FOR_CLEAR(cache_ptr, entry_ptr)

        /* Check for entry changing status and do notifications, etc. */
        if (was_dirty) {
            /* If the entry's type has a 'notify' callback send a 'entry cleaned'
             * notice now that the entry is fully integrated into the cache.
             */
            if (entry_ptr->type->notify &&
                (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_CLEANED, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                            "can't notify client about entry dirty flag cleared")

            /* Propagate the clean up the flush dependency chain, if appropriate */
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_clean(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKCLEAN, FAIL, "Can't propagate flush dep clean")
        } /* end if */
    }     /* end if */
    else
        HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKCLEAN, FAIL, "Entry is not pinned??")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_mark_entry_clean() */

/*-------------------------------------------------------------------------
 * Function:    H5C_mark_entry_unserialized
 *
 * Purpose:    Mark a pinned or protected entry as unserialized.  The target
 *             entry MUST be either pinned or protected, and MAY be both.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              12/23/16
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_mark_entry_unserialized(void *thing)
{
    H5C_cache_entry_t *entry     = (H5C_cache_entry_t *)thing;
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry);
    assert(H5_addr_defined(entry->addr));

    if (entry->is_protected || entry->is_pinned) {
        assert(!entry->is_read_only);

        /* Reset image_up_to_date */
        if (entry->image_up_to_date) {
            entry->image_up_to_date = FALSE;

            if (entry->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_unserialized(entry) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTSET, FAIL,
                                "Can't propagate serialization status to fd parents")
        } /* end if */
    }     /* end if */
    else
        HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKUNSERIALIZED, FAIL,
                    "Entry to unserialize is neither pinned nor protected??")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_mark_entry_unserialized() */

/*-------------------------------------------------------------------------
 * Function:    H5C_mark_entry_serialized
 *
 * Purpose:    Mark a pinned entry as serialized.  The target entry MUST be
 *             pinned.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              12/23/16
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_mark_entry_serialized(void *_thing)
{
    H5C_cache_entry_t *entry     = (H5C_cache_entry_t *)_thing;
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry);
    assert(H5_addr_defined(entry->addr));

    /* Operate on pinned entry */
    if (entry->is_protected)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKSERIALIZED, FAIL, "entry is protected")
    else if (entry->is_pinned) {
        /* Check for entry changing status and do notifications, etc. */
        if (!entry->image_up_to_date) {
            /* Set the image_up_to_date flag */
            entry->image_up_to_date = TRUE;

            /* Propagate the serialize up the flush dependency chain, if appropriate */
            if (entry->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_serialized(entry) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKSERIALIZED, FAIL,
                                "Can't propagate flush dep serialize")
        } /* end if */
    }     /* end if */
    else
        HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKSERIALIZED, FAIL, "Entry is not pinned??")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_mark_entry_serialized() */

/*-------------------------------------------------------------------------
 * Function:    H5C_move_entry
 *
 * Purpose:     Use this function to notify the cache that an entry's
 *              file address changed.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              6/2/04
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_move_entry(H5C_t *cache_ptr, const H5C_class_t *type, haddr_t old_addr, haddr_t new_addr)
{
    H5C_cache_entry_t *entry_ptr      = NULL;
    H5C_cache_entry_t *test_entry_ptr = NULL;
    herr_t             ret_value      = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    assert(cache_ptr);
    assert(type);
    assert(H5_addr_defined(old_addr));
    assert(H5_addr_defined(new_addr));
    assert(H5_addr_ne(old_addr, new_addr));

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    H5C__SEARCH_INDEX(cache_ptr, old_addr, entry_ptr, FAIL)

    if (entry_ptr == NULL || entry_ptr->type != type)
        /* the old item doesn't exist in the cache, so we are done. */
        HGOTO_DONE(SUCCEED)

    assert(entry_ptr->addr == old_addr);
    assert(entry_ptr->type == type);

    /* Check for R/W status, otherwise error */
    /* (Moving a R/O entry would mark it dirty, which shouldn't
     *  happen. QAK - 2016/12/02)
     */
    if (entry_ptr->is_read_only)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTMOVE, FAIL, "can't move R/O entry")

    H5C__SEARCH_INDEX(cache_ptr, new_addr, test_entry_ptr, FAIL)

    if (test_entry_ptr != NULL) { /* we are hosed */
        if (test_entry_ptr->type == type)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTMOVE, FAIL, "target already moved & reinserted???")
        else
            HGOTO_ERROR(H5E_CACHE, H5E_CANTMOVE, FAIL, "new address already in use?")
    } /* end if */

    /* If we get this far we have work to do.  Remove *entry_ptr from
     * the hash table (and skip list if necessary), change its address to the
     * new address, mark it as dirty (if it isn't already) and then re-insert.
     *
     * Update the replacement policy for a hit to avoid an eviction before
     * the moved entry is touched.  Update stats for a move.
     *
     * Note that we do not check the size of the cache, or evict anything.
     * Since this is a simple re-name, cache size should be unaffected.
     *
     * Check to see if the target entry is in the process of being destroyed
     * before we delete from the index, etc.  If it is, all we do is
     * change the addr.  If the entry is only in the process of being flushed,
     * don't mark it as dirty either, lest we confuse the flush call back.
     */
    if (!entry_ptr->destroy_in_progress) {
        H5C__DELETE_FROM_INDEX(cache_ptr, entry_ptr, FAIL);

        if (entry_ptr->in_slist) {
            assert(cache_ptr->slist_ptr);
            H5C__REMOVE_ENTRY_FROM_SLIST(cache_ptr, entry_ptr, FALSE, FAIL)
        } /* end if */
    }     /* end if */

    entry_ptr->addr = new_addr;

    if (!entry_ptr->destroy_in_progress) {
        hbool_t was_dirty; /* Whether the entry was previously dirty */

        /* Remember previous dirty status */
        was_dirty = entry_ptr->is_dirty;

        /* Mark the entry as dirty if it isn't already */
        entry_ptr->is_dirty = TRUE;

        /* This shouldn't be needed, but it keeps the test code happy */
        if (entry_ptr->image_up_to_date) {
            entry_ptr->image_up_to_date = FALSE;
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_unserialized(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                                "Can't propagate serialization status to fd parents")
        } /* end if */

        /* Modify cache data structures */
        H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, FAIL);
        H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL);

        /* Skip some actions if we're in the middle of flushing the entry */
        if (!entry_ptr->flush_in_progress) {
            /* Update the replacement policy for the entry */
            H5C__UPDATE_RP_FOR_MOVE(cache_ptr, entry_ptr, was_dirty, FAIL);

            /* Check for entry changing status and do notifications, etc. */
            if (!was_dirty) {
                /* If the entry's type has a 'notify' callback send a 'entry dirtied'
                 * notice now that the entry is fully integrated into the cache.
                 */
                if (entry_ptr->type->notify &&
                    (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_DIRTIED, entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                                "can't notify client about entry dirty flag set")

                /* Propagate the dirty flag up the flush dependency chain if appropriate */
                if (entry_ptr->flush_dep_nparents > 0)
                    if (H5C__mark_flush_dep_dirty(entry_ptr) < 0)
                        HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL,
                                    "Can't propagate flush dep dirty flag")
            } /* end if */
        }     /* end if */
    }         /* end if */

    H5C__UPDATE_STATS_FOR_MOVE(cache_ptr, entry_ptr)

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_move_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C_resize_entry
 *
 * Purpose:    Resize a pinned or protected entry.
 *
 *         Resizing an entry dirties it, so if the entry is not
 *         already dirty, the function places the entry on the
 *         skip list.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              7/5/06
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_resize_entry(void *thing, size_t new_size)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *entry_ptr = (H5C_cache_entry_t *)thing;
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry_ptr);
    assert(H5_addr_defined(entry_ptr->addr));
    cache_ptr = entry_ptr->cache_ptr;
    assert(cache_ptr);

    /* Check for usage errors */
    if (new_size <= 0)
        HGOTO_ERROR(H5E_CACHE, H5E_BADVALUE, FAIL, "New size is non-positive")
    if (!(entry_ptr->is_pinned || entry_ptr->is_protected))
        HGOTO_ERROR(H5E_CACHE, H5E_BADTYPE, FAIL, "Entry isn't pinned or protected??")

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    /* update for change in entry size if necessary */
    if (entry_ptr->size != new_size) {
        hbool_t was_clean;

        /* make note of whether the entry was clean to begin with */
        was_clean = !entry_ptr->is_dirty;

        /* mark the entry as dirty if it isn't already */
        entry_ptr->is_dirty = TRUE;

        /* Reset the image up-to-date status */
        if (entry_ptr->image_up_to_date) {
            entry_ptr->image_up_to_date = FALSE;
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_unserialized(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                                "Can't propagate serialization status to fd parents")
        } /* end if */

        /* Release the current image */
        if (entry_ptr->image_ptr)
            entry_ptr->image_ptr = H5MM_xfree(entry_ptr->image_ptr);

        /* do a flash cache size increase if appropriate */
        if (cache_ptr->flash_size_increase_possible) {
            if (new_size > entry_ptr->size) {
                size_t size_increase;

                size_increase = new_size - entry_ptr->size;
                if (size_increase >= cache_ptr->flash_size_increase_threshold)
                    if (H5C__flash_increase_cache_size(cache_ptr, entry_ptr->size, new_size) < 0)
                        HGOTO_ERROR(H5E_CACHE, H5E_CANTRESIZE, FAIL, "flash cache increase failed")
            }
        }

        /* update the pinned and/or protected entry list */
        if (entry_ptr->is_pinned)
            H5C__DLL_UPDATE_FOR_SIZE_CHANGE(cache_ptr->pel_len, cache_ptr->pel_size, entry_ptr->size,
                                            new_size, FAIL)
        if (entry_ptr->is_protected)
            H5C__DLL_UPDATE_FOR_SIZE_CHANGE(cache_ptr->pl_len, cache_ptr->pl_size, entry_ptr->size, new_size,
                                            FAIL)

#ifdef H5_HAVE_PARALLEL
        if (entry_ptr->coll_access)
            H5C__DLL_UPDATE_FOR_SIZE_CHANGE(cache_ptr->coll_list_len, cache_ptr->coll_list_size,
                                            entry_ptr->size, new_size, FAIL)
#endif /* H5_HAVE_PARALLEL */

        /* update statistics just before changing the entry size */
        H5C__UPDATE_STATS_FOR_ENTRY_SIZE_CHANGE(cache_ptr, entry_ptr, new_size);

        /* update the hash table */
        H5C__UPDATE_INDEX_FOR_SIZE_CHANGE(cache_ptr, entry_ptr->size, new_size, entry_ptr, was_clean, FAIL);

        /* if the entry is in the skip list, update that too */
        if (entry_ptr->in_slist)
            H5C__UPDATE_SLIST_FOR_SIZE_CHANGE(cache_ptr, entry_ptr->size, new_size);

        /* finally, update the entry size proper */
        entry_ptr->size = new_size;

        if (!entry_ptr->in_slist)
            H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL);

        if (entry_ptr->is_pinned)
            H5C__UPDATE_STATS_FOR_DIRTY_PIN(cache_ptr, entry_ptr)

        /* Check for entry changing status and do notifications, etc. */
        if (was_clean) {
            /* If the entry's type has a 'notify' callback send a 'entry dirtied'
             * notice now that the entry is fully integrated into the cache.
             */
            if (entry_ptr->type->notify &&
                (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_DIRTIED, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry dirty flag set")

            /* Propagate the dirty flag up the flush dependency chain if appropriate */
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_dirty(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL, "Can't propagate flush dep dirty flag")
        } /* end if */
    }     /* end if */

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_resize_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C_pin_protected_entry()
 *
 * Purpose:    Pin a protected cache entry.  The entry must be protected
 *             at the time of call, and must be unpinned.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              4/26/06
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_pin_protected_entry(void *thing)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *entry_ptr = (H5C_cache_entry_t *)thing; /* Pointer to entry to pin */
    herr_t             ret_value = SUCCEED;                    /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry_ptr);
    assert(H5_addr_defined(entry_ptr->addr));
    cache_ptr = entry_ptr->cache_ptr;
    assert(cache_ptr);

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    /* Only protected entries can be pinned */
    if (!entry_ptr->is_protected)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "Entry isn't protected")

    /* Pin the entry from a client */
    if (H5C__pin_entry_from_client(cache_ptr, entry_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "Can't pin entry by client")

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_pin_protected_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C_protect
 *
 * Purpose:     If the target entry is not in the cache, load it.  If
 *        necessary, attempt to evict one or more entries to keep
 *        the cache within its maximum size.
 *
 *        Mark the target entry as protected, and return its address
 *        to the caller.  The caller must call H5C_unprotect() when
 *        finished with the entry.
 *
 *        While it is protected, the entry may not be either evicted
 *        or flushed -- nor may it be accessed by another call to
 *        H5C_protect.  Any attempt to do so will result in a failure.
 *
 * Return:      Success:        Ptr to the desired entry
 *              Failure:        NULL
 *
 * Programmer:  John Mainzer -  6/2/04
 *
 *-------------------------------------------------------------------------
 */
void *
H5C_protect(H5F_t *f, const H5C_class_t *type, haddr_t addr, void *udata, unsigned flags)
{
    H5C_t      *cache_ptr;
    H5AC_ring_t ring = H5C_RING_UNDEFINED;
    hbool_t     hit;
    hbool_t     have_write_permitted = FALSE;
    hbool_t     read_only            = FALSE;
    hbool_t     flush_last;
#ifdef H5_HAVE_PARALLEL
    hbool_t coll_access = FALSE; /* whether access to the cache entry is done collectively */
#endif                           /* H5_HAVE_PARALLEL */
    hbool_t            write_permitted = FALSE;
    hbool_t            was_loaded      = FALSE; /* Whether the entry was loaded as a result of the protect */
    size_t             empty_space;
    void              *thing;
    H5C_cache_entry_t *entry_ptr;
    void              *ret_value = NULL; /* Return value */

    FUNC_ENTER_NOAPI(NULL)

    /* check args */
    assert(f);
    assert(f->shared);
    cache_ptr = f->shared->cache;
    assert(cache_ptr);
    assert(type);
    assert(type->mem_type == cache_ptr->class_table_ptr[type->id]->mem_type);
    assert(H5_addr_defined(addr));

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, "an extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    /* 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, NULL, "Can't load cache image")
    } /* end if */

    read_only  = ((flags & H5C__READ_ONLY_FLAG) != 0);
    flush_last = ((flags & H5C__FLUSH_LAST_FLAG) != 0);

    /* Get the ring type from the API context */
    ring = H5CX_get_ring();

#ifdef H5_HAVE_PARALLEL
    if (H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI))
        coll_access = H5F_get_coll_metadata_reads(f);
#endif /* H5_HAVE_PARALLEL */

    /* first check to see if the target is in cache */
    H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, NULL)

    if (entry_ptr != NULL) {
        if (entry_ptr->ring != ring)
            HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, "ring type mismatch occurred for cache entry")

        if (entry_ptr->prefetched) {
            /* This call removes the prefetched entry from the cache,
             * and replaces it with an entry deserialized from the
             * image of the prefetched entry.
             */
            if (H5C__deserialize_prefetched_entry(f, cache_ptr, &entry_ptr, type, addr, udata) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "can't deserialize prefetched entry")

            assert(!entry_ptr->prefetched);
            assert(entry_ptr->addr == addr);
        } /* end if */

        /* Check for trying to load the wrong type of entry from an address */
        if (entry_ptr->type != type)
            HGOTO_ERROR(H5E_CACHE, H5E_BADTYPE, NULL, "incorrect cache entry type")

#ifdef H5_HAVE_PARALLEL
        /* If this is a collective metadata read, the entry is not marked as
         * collective, and is clean, it is possible that other processes will
         * not have it in its cache and will expect a bcast of the entry from
         * process 0. So process 0 will bcast the entry to all other ranks.
         * Ranks that _do_ have the entry in their cache still have to
         * participate in the bcast.
         */
        if (coll_access) {
            if (!entry_ptr->is_dirty && !entry_ptr->coll_access) {
                MPI_Comm comm;     /* File MPI Communicator */
                int      mpi_code; /* MPI error code */
                int      buf_size;

                if (MPI_COMM_NULL == (comm = H5F_mpi_get_comm(f)))
                    HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "get_comm request failed")

                if (entry_ptr->image_ptr == NULL) {
                    int mpi_rank;

                    if ((mpi_rank = H5F_mpi_get_rank(f)) < 0)
                        HGOTO_ERROR(H5E_FILE, H5E_CANTGET, NULL, "Can't get MPI rank")

                    if (NULL == (entry_ptr->image_ptr = H5MM_malloc(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
                    H5MM_memcpy(((uint8_t *)entry_ptr->image_ptr) + entry_ptr->size, H5C_IMAGE_SANITY_VALUE,
                                H5C_IMAGE_EXTRA_SPACE);
#endif /* H5C_DO_MEMORY_SANITY_CHECKS */
                    if (0 == mpi_rank && H5C__generate_image(f, cache_ptr, entry_ptr) < 0)
                        /* If image generation fails, push an error but
                         * still participate in the following MPI_Bcast
                         */
                        HDONE_ERROR(H5E_CACHE, H5E_CANTGET, NULL, "can't generate entry's image")
                } /* end if */
                assert(entry_ptr->image_ptr);

                H5_CHECKED_ASSIGN(buf_size, int, entry_ptr->size, size_t);
                if (MPI_SUCCESS != (mpi_code = MPI_Bcast(entry_ptr->image_ptr, buf_size, MPI_BYTE, 0, comm)))
                    HMPI_GOTO_ERROR(NULL, "MPI_Bcast failed", mpi_code)

                /* Mark the entry as collective and insert into the collective list */
                entry_ptr->coll_access = TRUE;
                H5C__INSERT_IN_COLL_LIST(cache_ptr, entry_ptr, NULL)
            } /* end if */
            else if (entry_ptr->coll_access)
                H5C__MOVE_TO_TOP_IN_COLL_LIST(cache_ptr, entry_ptr, NULL)
        } /* end if */
#endif    /* H5_HAVE_PARALLEL */

#ifdef H5C_DO_TAGGING_SANITY_CHECKS
        {
            /* Verify tag value */
            if (cache_ptr->ignore_tags != TRUE) {
                haddr_t tag; /* Tag value */

                /* The entry is already in the cache, but make sure that the tag value
                 * is still legal. This will ensure that had the entry NOT been in the
                 * cache, tagging was still set up correctly and it would have received
                 * a legal tag value after getting loaded from disk.
                 */

                /* Get the tag */
                tag = H5CX_get_tag();

                if (H5C_verify_tag(entry_ptr->type->id, tag) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTGET, NULL, "tag verification failed")
            } /* end if */
        }
#endif

        hit   = TRUE;
        thing = (void *)entry_ptr;
    }
    else {
        /* must try to load the entry from disk. */
        hit = FALSE;
        if (NULL == (thing = H5C__load_entry(f,
#ifdef H5_HAVE_PARALLEL
                                             coll_access,
#endif /* H5_HAVE_PARALLEL */
                                             type, addr, udata)))
            HGOTO_ERROR(H5E_CACHE, H5E_CANTLOAD, NULL, "can't load entry")

        entry_ptr = (H5C_cache_entry_t *)thing;
        cache_ptr->entries_loaded_counter++;

        entry_ptr->ring = ring;
#ifdef H5_HAVE_PARALLEL
        if (H5F_HAS_FEATURE(f, H5FD_FEAT_HAS_MPI) && entry_ptr->coll_access)
            H5C__INSERT_IN_COLL_LIST(cache_ptr, entry_ptr, NULL)
#endif /* H5_HAVE_PARALLEL */

        /* Apply tag to newly protected entry */
        if (H5C__tag_entry(cache_ptr, entry_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTTAG, NULL, "Cannot tag metadata entry")

        /* If the entry is very large, and we are configured to allow it,
         * we may wish to perform a flash cache size increase.
         */
        if (cache_ptr->flash_size_increase_possible &&
            (entry_ptr->size > cache_ptr->flash_size_increase_threshold))
            if (H5C__flash_increase_cache_size(cache_ptr, 0, entry_ptr->size) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, "H5C__flash_increase_cache_size failed")

        if (cache_ptr->index_size >= cache_ptr->max_cache_size)
            empty_space = 0;
        else
            empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;

        /* try to free up if necceary and if evictions are permitted.  Note
         * that if evictions are enabled, we will call H5C__make_space_in_cache()
         * regardless if the min_free_space requirement is not met.
         */
        if (cache_ptr->evictions_enabled &&
            (((cache_ptr->index_size + entry_ptr->size) > cache_ptr->max_cache_size) ||
             ((empty_space + cache_ptr->clean_index_size) < cache_ptr->min_clean_size))) {

            size_t space_needed;

            if (empty_space <= entry_ptr->size)
                cache_ptr->cache_full = TRUE;

            if (cache_ptr->check_write_permitted != NULL) {
                if ((cache_ptr->check_write_permitted)(f, &write_permitted) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, "Can't get write_permitted 1")
                else
                    have_write_permitted = TRUE;
            } /* end if */
            else {
                write_permitted      = cache_ptr->write_permitted;
                have_write_permitted = TRUE;
            } /* end else */

            assert(entry_ptr->size <= H5C_MAX_ENTRY_SIZE);
            space_needed = entry_ptr->size;
            if (space_needed > cache_ptr->max_cache_size)
                space_needed = cache_ptr->max_cache_size;

            /* Note that space_needed is just the amount of space that
             * needed to insert the new entry without exceeding the cache
             * size limit.  The subsequent call to H5C__make_space_in_cache()
             * may evict the entries required to free more or less space
             * depending on conditions.  It MAY be less if the cache is
             * currently undersized, or more if the cache is oversized.
             *
             * The cache can exceed its maximum size limit via the following
             * mechanisms:
             *
             * First, it is possible for the cache to grow without
             * bound as long as entries are protected and not unprotected.
             *
             * Second, when writes are not permitted it is also possible
             * for the cache to grow without bound.
             *
             * Third, the user may choose to disable evictions -- causing
             * the cache to grow without bound until evictions are
             * re-enabled.
             *
             * Finally, we usually don't check to see if the cache is
             * oversized at the end of an unprotect.  As a result, it is
             * possible to have a vastly oversized cache with no protected
             * entries as long as all the protects precede the unprotects.
             */
            if (H5C__make_space_in_cache(f, space_needed, write_permitted) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, "H5C__make_space_in_cache failed")
        } /* end if */

        /* Insert the entry in the hash table.
         *
         *   *******************************************
         *
         * Set the flush_me_last field
         * of the newly loaded entry before inserting it into the
         * index.  Must do this, as the index tracked the number of
         * entries with the flush_last field set, but assumes that
         * the field will not change after insertion into the index.
         *
         * Note that this means that the H5C__FLUSH_LAST_FLAG flag
         * is ignored if the entry is already in cache.
         */
        entry_ptr->flush_me_last = flush_last;

        H5C__INSERT_IN_INDEX(cache_ptr, entry_ptr, NULL);
        if (entry_ptr->is_dirty && !entry_ptr->in_slist)
            H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, NULL);

        /* insert the entry in the data structures used by the replacement
         * policy.  We are just going to take it out again when we update
         * the replacement policy for a protect, but this simplifies the
         * code.  If we do this often enough, we may want to optimize this.
         */
        H5C__UPDATE_RP_FOR_INSERTION(cache_ptr, entry_ptr, NULL)

        /* Record that the entry was loaded, to trigger a notify callback later */
        /* (After the entry is fully added to the cache) */
        was_loaded = TRUE;
    } /* end else */

    assert(entry_ptr->addr == addr);
    assert(entry_ptr->type == type);

    if (entry_ptr->is_protected) {
        if (read_only && entry_ptr->is_read_only) {
            assert(entry_ptr->ro_ref_count > 0);
            (entry_ptr->ro_ref_count)++;
        } /* end if */
        else
            HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, "Target already protected & not read only?!?")
    } /* end if */
    else {
        H5C__UPDATE_RP_FOR_PROTECT(cache_ptr, entry_ptr, NULL)

        entry_ptr->is_protected = TRUE;
        if (read_only) {
            entry_ptr->is_read_only = TRUE;
            entry_ptr->ro_ref_count = 1;
        } /* end if */
        entry_ptr->dirtied = FALSE;
    } /* end else */

    H5C__UPDATE_CACHE_HIT_RATE_STATS(cache_ptr, hit)
    H5C__UPDATE_STATS_FOR_PROTECT(cache_ptr, entry_ptr, hit)

    ret_value = thing;

    if (cache_ptr->evictions_enabled &&
        (cache_ptr->size_decreased ||
         (cache_ptr->resize_enabled && (cache_ptr->cache_accesses >= cache_ptr->resize_ctl.epoch_length)))) {

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

        if (cache_ptr->resize_enabled && (cache_ptr->cache_accesses >= cache_ptr->resize_ctl.epoch_length))
            if (H5C__auto_adjust_cache_size(f, write_permitted) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTPROTECT, NULL, "Cache auto-resize failed")

        if (cache_ptr->size_decreased) {
            cache_ptr->size_decreased = FALSE;

            /* check to see if the cache is now oversized due to the cache
             * size reduction.  If it is, try to evict enough entries to
             * bring the cache size down to the current maximum cache size.
             *
             * Also, if the min_clean_size requirement is not met, we
             * should also call H5C__make_space_in_cache() to bring us
             * into compliance.
             */
            if (cache_ptr->index_size >= cache_ptr->max_cache_size)
                empty_space = 0;
            else
                empty_space = cache_ptr->max_cache_size - cache_ptr->index_size;

            if ((cache_ptr->index_size > cache_ptr->max_cache_size) ||
                ((empty_space + cache_ptr->clean_index_size) < cache_ptr->min_clean_size)) {

                if (cache_ptr->index_size > cache_ptr->max_cache_size)
                    cache_ptr->cache_full = TRUE;

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

    /* If we loaded the entry and the entry's type has a 'notify' callback, send
     * an 'after load' notice now that the entry is fully integrated into
     * the cache and protected.  We must wait until it is protected so it is not
     * evicted during the notify callback.
     */
    if (was_loaded)
        /* If the entry's type has a 'notify' callback send a 'after load'
         * notice now that the entry is fully integrated into the cache.
         */
        if (entry_ptr->type->notify && (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_AFTER_LOAD, entry_ptr) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, NULL,
                        "can't notify client about entry inserted into cache")

#ifdef H5_HAVE_PARALLEL
    /* Make sure the size of the collective entries in the cache remain in check */
    if (coll_access) {
        if (H5P_USER_TRUE == H5F_COLL_MD_READ(f)) {
            if (cache_ptr->max_cache_size * 80 < cache_ptr->coll_list_size * 100)
                if (H5C_clear_coll_entries(cache_ptr, TRUE) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, NULL, "can't clear collective metadata entries")
        } /* end if */
        else {
            if (cache_ptr->max_cache_size * 40 < cache_ptr->coll_list_size * 100)
                if (H5C_clear_coll_entries(cache_ptr, TRUE) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTFLUSH, NULL, "can't clear collective metadata entries")
        } /* end else */
    }     /* end if */
#endif    /* H5_HAVE_PARALLEL */

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, NULL, "an extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_protect() */

/*-------------------------------------------------------------------------
 * Function:    H5C_unpin_entry()
 *
 * Purpose:    Unpin a cache entry.  The entry can be either protected or
 *             unprotected at the time of call, but must be pinned.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              3/22/06
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_unpin_entry(void *_entry_ptr)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *entry_ptr = (H5C_cache_entry_t *)_entry_ptr; /* Pointer to entry to unpin */
    herr_t             ret_value = SUCCEED;                         /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity check */
    assert(entry_ptr);
    cache_ptr = entry_ptr->cache_ptr;
    assert(cache_ptr);

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    /* Unpin the entry */
    if (H5C__unpin_entry_from_client(cache_ptr, entry_ptr, TRUE) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "Can't unpin entry from client")

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_unpin_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C_unprotect
 *
 * Purpose:    Undo an H5C_protect() call -- specifically, mark the
 *        entry as unprotected, remove it from the protected list,
 *        and give it back to the replacement policy.
 *
 *        The TYPE and ADDR arguments must be the same as those in
 *        the corresponding call to H5C_protect() and the THING
 *        argument must be the value returned by that call to
 *        H5C_protect().
 *
 * Return:      Non-negative on success/Negative on failure
 *
 *        If the deleted flag is TRUE, simply remove the target entry
 *        from the cache, clear it, and free it without writing it to
 *        disk.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              6/2/04
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_unprotect(H5F_t *f, haddr_t addr, void *thing, unsigned flags)
{
    H5C_t  *cache_ptr;
    hbool_t deleted;
    hbool_t dirtied;
    hbool_t set_flush_marker;
    hbool_t pin_entry;
    hbool_t unpin_entry;
    hbool_t free_file_space;
    hbool_t take_ownership;
    hbool_t was_clean;
#ifdef H5_HAVE_PARALLEL
    hbool_t clear_entry = FALSE;
#endif /* H5_HAVE_PARALLEL */
    H5C_cache_entry_t *entry_ptr;
    H5C_cache_entry_t *test_entry_ptr;
    herr_t             ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    deleted          = ((flags & H5C__DELETED_FLAG) != 0);
    dirtied          = ((flags & H5C__DIRTIED_FLAG) != 0);
    set_flush_marker = ((flags & H5C__SET_FLUSH_MARKER_FLAG) != 0);
    pin_entry        = ((flags & H5C__PIN_ENTRY_FLAG) != 0);
    unpin_entry      = ((flags & H5C__UNPIN_ENTRY_FLAG) != 0);
    free_file_space  = ((flags & H5C__FREE_FILE_SPACE_FLAG) != 0);
    take_ownership   = ((flags & H5C__TAKE_OWNERSHIP_FLAG) != 0);

    assert(f);
    assert(f->shared);

    cache_ptr = f->shared->cache;

    assert(cache_ptr);
    assert(H5_addr_defined(addr));
    assert(thing);
    assert(!(pin_entry && unpin_entry));

    /* deleted flag must accompany free_file_space */
    assert((!free_file_space) || (deleted));

    /* deleted flag must accompany take_ownership */
    assert((!take_ownership) || (deleted));

    /* can't have both free_file_space & take_ownership */
    assert(!(free_file_space && take_ownership));

    entry_ptr = (H5C_cache_entry_t *)thing;
    assert(entry_ptr->addr == addr);

    /* also set the dirtied variable if the dirtied field is set in
     * the entry.
     */
    dirtied |= entry_ptr->dirtied;
    was_clean = !(entry_ptr->is_dirty);

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    /* if the entry has multiple read only protects, just decrement
     * the ro_ref_counter.  Don't actually unprotect until the ref count
     * drops to zero.
     */
    if (entry_ptr->ro_ref_count > 1) {
        /* Sanity check */
        assert(entry_ptr->is_protected);
        assert(entry_ptr->is_read_only);

        if (dirtied)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Read only entry modified??")

        /* Reduce the RO ref count */
        (entry_ptr->ro_ref_count)--;

        /* Pin or unpin the entry as requested. */
        if (pin_entry) {
            /* Pin the entry from a client */
            if (H5C__pin_entry_from_client(cache_ptr, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "Can't pin entry by client")
        }
        else if (unpin_entry) {
            /* Unpin the entry from a client */
            if (H5C__unpin_entry_from_client(cache_ptr, entry_ptr, FALSE) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "Can't unpin entry by client")
        } /* end if */
    }
    else {
        if (entry_ptr->is_read_only) {
            /* Sanity check */
            assert(entry_ptr->ro_ref_count == 1);

            if (dirtied)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Read only entry modified??")

            entry_ptr->is_read_only = FALSE;
            entry_ptr->ro_ref_count = 0;
        } /* end if */

#ifdef H5_HAVE_PARALLEL
        /* When the H5C code is used to implement the metadata cache in the
         * PHDF5 case, only the cache on process 0 is allowed to write to file.
         * All the other metadata caches must hold dirty entries until they
         * are told that the entries are clean.
         *
         * The clear_on_unprotect flag in the H5C_cache_entry_t structure
         * exists to deal with the case in which an entry is protected when
         * its cache receives word that the entry is now clean.  In this case,
         * the clear_on_unprotect flag is set, and the entry is flushed with
         * the H5C__FLUSH_CLEAR_ONLY_FLAG.
         *
         * All this is a bit awkward, but until the metadata cache entries
         * are contiguous, with only one dirty flag, we have to let the supplied
         * functions deal with the resetting the is_dirty flag.
         */
        if (entry_ptr->clear_on_unprotect) {
            /* Sanity check */
            assert(entry_ptr->is_dirty);

            entry_ptr->clear_on_unprotect = FALSE;
            if (!dirtied)
                clear_entry = TRUE;
        } /* end if */
#endif    /* H5_HAVE_PARALLEL */

        if (!entry_ptr->is_protected)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Entry already unprotected??")

        /* Mark the entry as dirty if appropriate */
        entry_ptr->is_dirty = (entry_ptr->is_dirty || dirtied);
        if (dirtied && entry_ptr->image_up_to_date) {
            entry_ptr->image_up_to_date = FALSE;
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_unserialized(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                                "Can't propagate serialization status to fd parents")
        } /* end if */

        /* Check for newly dirtied entry */
        if (was_clean && entry_ptr->is_dirty) {
            /* Update index for newly dirtied entry */
            H5C__UPDATE_INDEX_FOR_ENTRY_DIRTY(cache_ptr, entry_ptr, FAIL)

            /* If the entry's type has a 'notify' callback send a
             * 'entry dirtied' notice now that the entry is fully
             * integrated into the cache.
             */
            if (entry_ptr->type->notify &&
                (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_DIRTIED, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry dirty flag set")

            /* Propagate the flush dep dirty flag up the flush dependency chain
             * if appropriate
             */
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_dirty(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL, "Can't propagate flush dep dirty flag")
        } /* end if */
        /* Check for newly clean entry */
        else if (!was_clean && !entry_ptr->is_dirty) {

            /* If the entry's type has a 'notify' callback send a
             * 'entry cleaned' notice now that the entry is fully
             * integrated into the cache.
             */
            if (entry_ptr->type->notify &&
                (entry_ptr->type->notify)(H5C_NOTIFY_ACTION_ENTRY_CLEANED, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                            "can't notify client about entry dirty flag cleared")

            /* Propagate the flush dep clean flag up the flush dependency chain
             * if appropriate
             */
            if (entry_ptr->flush_dep_nparents > 0)
                if (H5C__mark_flush_dep_clean(entry_ptr) < 0)
                    HGOTO_ERROR(H5E_CACHE, H5E_CANTMARKDIRTY, FAIL, "Can't propagate flush dep dirty flag")
        } /* end else-if */

        /* Pin or unpin the entry as requested. */
        if (pin_entry) {
            /* Pin the entry from a client */
            if (H5C__pin_entry_from_client(cache_ptr, entry_ptr) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTPIN, FAIL, "Can't pin entry by client")
        }
        else if (unpin_entry) {
            /* Unpin the entry from a client */
            if (H5C__unpin_entry_from_client(cache_ptr, entry_ptr, FALSE) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "Can't unpin entry by client")
        } /* end if */

        /* H5C__UPDATE_RP_FOR_UNPROTECT will place the unprotected entry on
         * the pinned entry list if entry_ptr->is_pinned is TRUE.
         */
        H5C__UPDATE_RP_FOR_UNPROTECT(cache_ptr, entry_ptr, FAIL);

        entry_ptr->is_protected = FALSE;

        /* if the entry is dirty, 'or' its flush_marker with the set flush flag,
         * and then add it to the skip list if it isn't there already.
         */
        if (entry_ptr->is_dirty) {
            entry_ptr->flush_marker |= set_flush_marker;
            if (!entry_ptr->in_slist)
                /* this is a no-op if cache_ptr->slist_enabled is FALSE */
                H5C__INSERT_ENTRY_IN_SLIST(cache_ptr, entry_ptr, FAIL);
        } /* end if */

        /* This implementation of the "deleted" option is a bit inefficient, as
         * we re-insert the entry to be deleted into the replacement policy
         * data structures, only to remove them again.  Depending on how often
         * we do this, we may want to optimize a bit.
         */
        if (deleted) {
            unsigned flush_flags = (H5C__FLUSH_CLEAR_ONLY_FLAG | H5C__FLUSH_INVALIDATE_FLAG);

            /* verify that the target entry is in the cache. */
            H5C__SEARCH_INDEX(cache_ptr, addr, test_entry_ptr, FAIL)

            if (test_entry_ptr == NULL)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "entry not in hash table?!?")
            else if (test_entry_ptr != entry_ptr)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL,
                            "hash table contains multiple entries for addr?!?")

            /* Set the 'free file space' flag for the flush, if needed */
            if (free_file_space)
                flush_flags |= H5C__FREE_FILE_SPACE_FLAG;

            /* Set the "take ownership" flag for the flush, if needed */
            if (take_ownership)
                flush_flags |= H5C__TAKE_OWNERSHIP_FLAG;

            /* Delete the entry from the skip list on destroy */
            flush_flags |= H5C__DEL_FROM_SLIST_ON_DESTROY_FLAG;

            assert((!cache_ptr->slist_enabled) || (((!was_clean) || dirtied) == (entry_ptr->in_slist)));

            if (H5C__flush_single_entry(f, entry_ptr, flush_flags) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Can't flush entry")
        } /* end if */
#ifdef H5_HAVE_PARALLEL
        else if (clear_entry) {
            /* Verify that the target entry is in the cache. */
            H5C__SEARCH_INDEX(cache_ptr, addr, test_entry_ptr, FAIL)

            if (test_entry_ptr == NULL)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "entry not in hash table?!?")
            else if (test_entry_ptr != entry_ptr)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL,
                            "hash table contains multiple entries for addr?!?")

            if (H5C__flush_single_entry(f, entry_ptr,
                                        H5C__FLUSH_CLEAR_ONLY_FLAG | H5C__DEL_FROM_SLIST_ON_DESTROY_FLAG) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPROTECT, FAIL, "Can't clear entry")
        } /* end else if */
#endif    /* H5_HAVE_PARALLEL */
    }

    H5C__UPDATE_STATS_FOR_UNPROTECT(cache_ptr)

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_protected_entry_list(cache_ptr) < 0 || H5C__validate_pinned_entry_list(cache_ptr) < 0 ||
        H5C__validate_lru_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "an extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_unprotect() */

/*-------------------------------------------------------------------------
 * Function:    H5C_unsettle_entry_ring
 *
 * Purpose:     Advise the metadata cache that the specified entry's free space
 *              manager ring is no longer settled (if it was on entry).
 *
 *              If the target free space manager ring is already
 *              unsettled, do nothing, and return SUCCEED.
 *
 *              If the target free space manager ring is settled, and
 *              we are not in the process of a file shutdown, mark
 *              the ring as unsettled, and return SUCCEED.
 *
 *              If the target free space manager is settled, and we
 *              are in the process of a file shutdown, post an error
 *              message, and return FAIL.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              January 3, 2017
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_unsettle_entry_ring(void *_entry)
{
    H5C_cache_entry_t *entry = (H5C_cache_entry_t *)_entry; /* Entry whose ring to unsettle */
    H5C_t             *cache;                               /* Cache for file */
    herr_t             ret_value = SUCCEED;                 /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry);
    assert(entry->ring != H5C_RING_UNDEFINED);
    assert((H5C_RING_USER == entry->ring) || (H5C_RING_RDFSM == entry->ring) ||
           (H5C_RING_MDFSM == entry->ring));
    cache = entry->cache_ptr;
    assert(cache);

    switch (entry->ring) {
        case H5C_RING_USER:
            /* Do nothing */
            break;

        case H5C_RING_RDFSM:
            if (cache->rdfsm_settled) {
                if (cache->flush_in_progress || cache->close_warning_received)
                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unexpected rdfsm ring unsettle")
                cache->rdfsm_settled = FALSE;
            } /* end if */
            break;

        case H5C_RING_MDFSM:
            if (cache->mdfsm_settled) {
                if (cache->flush_in_progress || cache->close_warning_received)
                    HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "unexpected mdfsm ring unsettle")
                cache->mdfsm_settled = FALSE;
            } /* end if */
            break;

        default:
            assert(FALSE); /* this should be un-reachable */
            break;
    } /* end switch */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_unsettle_entry_ring() */

/*-------------------------------------------------------------------------
 * Function:    H5C_create_flush_dependency()
 *
 * Purpose:     Initiates a parent<->child entry flush dependency.  The parent
 *              entry must be pinned or protected at the time of call, and must
 *              have all dependencies removed before the cache can shut down.
 *
 * Note:        Flush dependencies in the cache indicate that a child entry
 *              must be flushed to the file before its parent.  (This is
 *              currently used to implement Single-Writer/Multiple-Reader (SWMR)
 *              I/O access for data structures in the file).
 *
 *              Creating a flush dependency between two entries will also pin
 *              the parent entry.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              3/05/09
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_create_flush_dependency(void *parent_thing, void *child_thing)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *parent_entry = (H5C_cache_entry_t *)parent_thing; /* Ptr to parent thing's entry */
    H5C_cache_entry_t *child_entry  = (H5C_cache_entry_t *)child_thing;  /* Ptr to child thing's entry */
    herr_t             ret_value    = SUCCEED;                           /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(parent_entry);
    assert(H5_addr_defined(parent_entry->addr));
    assert(child_entry);
    assert(H5_addr_defined(child_entry->addr));
    cache_ptr = parent_entry->cache_ptr;
    assert(cache_ptr);
    assert(cache_ptr == child_entry->cache_ptr);
#ifndef NDEBUG
    /* Make sure the parent is not already a parent */
    {
        unsigned u;

        for (u = 0; u < child_entry->flush_dep_nparents; u++)
            assert(child_entry->flush_dep_parent[u] != parent_entry);
    } /* end block */
#endif

    /* More sanity checks */
    if (child_entry == parent_entry)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTDEPEND, FAIL, "Child entry flush dependency parent can't be itself")
    if (!(parent_entry->is_protected || parent_entry->is_pinned))
        HGOTO_ERROR(H5E_CACHE, H5E_CANTDEPEND, FAIL, "Parent entry isn't pinned or protected")

    /* Check for parent not pinned */
    if (!parent_entry->is_pinned) {
        /* Sanity check */
        assert(parent_entry->flush_dep_nchildren == 0);
        assert(!parent_entry->pinned_from_client);
        assert(!parent_entry->pinned_from_cache);

        /* Pin the parent entry */
        parent_entry->is_pinned = TRUE;
        H5C__UPDATE_STATS_FOR_PIN(cache_ptr, parent_entry)
    } /* end else */

    /* Mark the entry as pinned from the cache's action (possibly redundantly) */
    parent_entry->pinned_from_cache = TRUE;

    /* Check if we need to resize the child's parent array */
    if (child_entry->flush_dep_nparents >= child_entry->flush_dep_parent_nalloc) {
        if (child_entry->flush_dep_parent_nalloc == 0) {
            /* Array does not exist yet, allocate it */
            assert(!child_entry->flush_dep_parent);

            if (NULL == (child_entry->flush_dep_parent =
                             H5FL_SEQ_MALLOC(H5C_cache_entry_ptr_t, H5C_FLUSH_DEP_PARENT_INIT)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                            "memory allocation failed for flush dependency parent list")
            child_entry->flush_dep_parent_nalloc = H5C_FLUSH_DEP_PARENT_INIT;
        } /* end if */
        else {
            /* Resize existing array */
            assert(child_entry->flush_dep_parent);

            if (NULL == (child_entry->flush_dep_parent =
                             H5FL_SEQ_REALLOC(H5C_cache_entry_ptr_t, child_entry->flush_dep_parent,
                                              2 * child_entry->flush_dep_parent_nalloc)))
                HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                            "memory allocation failed for flush dependency parent list")
            child_entry->flush_dep_parent_nalloc *= 2;
        } /* end else */
        cache_ptr->entry_fd_height_change_counter++;
    } /* end if */

    /* Add the dependency to the child's parent array */
    child_entry->flush_dep_parent[child_entry->flush_dep_nparents] = parent_entry;
    child_entry->flush_dep_nparents++;

    /* Increment parent's number of children */
    parent_entry->flush_dep_nchildren++;

    /* Adjust the number of dirty children */
    if (child_entry->is_dirty) {
        /* Sanity check */
        assert(parent_entry->flush_dep_ndirty_children < parent_entry->flush_dep_nchildren);

        parent_entry->flush_dep_ndirty_children++;

        /* If the parent has a 'notify' callback, send a 'child entry dirtied' notice */
        if (parent_entry->type->notify &&
            (parent_entry->type->notify)(H5C_NOTIFY_ACTION_CHILD_DIRTIED, parent_entry) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry dirty flag set")
    } /* end if */

    /* adjust the parent's number of unserialized children.  Note
     * that it is possible for and entry to be clean and unserialized.
     */
    if (!child_entry->image_up_to_date) {
        assert(parent_entry->flush_dep_nunser_children < parent_entry->flush_dep_nchildren);

        parent_entry->flush_dep_nunser_children++;

        /* If the parent has a 'notify' callback, send a 'child entry unserialized' notice */
        if (parent_entry->type->notify &&
            (parent_entry->type->notify)(H5C_NOTIFY_ACTION_CHILD_UNSERIALIZED, parent_entry) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry serialized flag reset")
    } /* end if */

    /* Post-conditions, for successful operation */
    assert(parent_entry->is_pinned);
    assert(parent_entry->flush_dep_nchildren > 0);
    assert(child_entry->flush_dep_parent);
    assert(child_entry->flush_dep_nparents > 0);
    assert(child_entry->flush_dep_parent_nalloc > 0);
#ifndef NDEBUG
    H5C__assert_flush_dep_nocycle(parent_entry, child_entry);
#endif

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_create_flush_dependency() */

/*-------------------------------------------------------------------------
 * Function:    H5C_destroy_flush_dependency()
 *
 * Purpose:     Terminates a parent<-> child entry flush dependency.  The
 *              parent entry must be pinned.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              3/05/09
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_destroy_flush_dependency(void *parent_thing, void *child_thing)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *parent_entry = (H5C_cache_entry_t *)parent_thing; /* Ptr to parent entry */
    H5C_cache_entry_t *child_entry  = (H5C_cache_entry_t *)child_thing;  /* Ptr to child entry */
    unsigned           u;                                                /* Local index variable */
    herr_t             ret_value = SUCCEED;                              /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(parent_entry);
    assert(H5_addr_defined(parent_entry->addr));
    assert(child_entry);
    assert(H5_addr_defined(child_entry->addr));
    cache_ptr = parent_entry->cache_ptr;
    assert(cache_ptr);
    assert(cache_ptr == child_entry->cache_ptr);

    /* Usage checks */
    if (!parent_entry->is_pinned)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL, "Parent entry isn't pinned")
    if (NULL == child_entry->flush_dep_parent)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL,
                    "Child entry doesn't have a flush dependency parent array")
    if (0 == parent_entry->flush_dep_nchildren)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL,
                    "Parent entry flush dependency ref. count has no child dependencies")

    /* Search for parent in child's parent array.  This is a linear search
     * because we do not expect large numbers of parents.  If this changes, we
     * may wish to change the parent array to a skip list */
    for (u = 0; u < child_entry->flush_dep_nparents; u++)
        if (child_entry->flush_dep_parent[u] == parent_entry)
            break;
    if (u == child_entry->flush_dep_nparents)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTUNDEPEND, FAIL,
                    "Parent entry isn't a flush dependency parent for child entry")

    /* Remove parent entry from child's parent array */
    if (u < (child_entry->flush_dep_nparents - 1))
        HDmemmove(&child_entry->flush_dep_parent[u], &child_entry->flush_dep_parent[u + 1],
                  (child_entry->flush_dep_nparents - u - 1) * sizeof(child_entry->flush_dep_parent[0]));
    child_entry->flush_dep_nparents--;

    /* Adjust parent entry's nchildren and unpin parent if it goes to zero */
    parent_entry->flush_dep_nchildren--;
    if (0 == parent_entry->flush_dep_nchildren) {
        /* Sanity check */
        assert(parent_entry->pinned_from_cache);

        /* Check if we should unpin parent entry now */
        if (!parent_entry->pinned_from_client)
            if (H5C__unpin_entry_real(cache_ptr, parent_entry, TRUE) < 0)
                HGOTO_ERROR(H5E_CACHE, H5E_CANTUNPIN, FAIL, "Can't unpin entry")

        /* Mark the entry as unpinned from the cache's action */
        parent_entry->pinned_from_cache = FALSE;
    } /* end if */

    /* Adjust parent entry's ndirty_children */
    if (child_entry->is_dirty) {
        /* Sanity check */
        assert(parent_entry->flush_dep_ndirty_children > 0);

        parent_entry->flush_dep_ndirty_children--;

        /* If the parent has a 'notify' callback, send a 'child entry cleaned' notice */
        if (parent_entry->type->notify &&
            (parent_entry->type->notify)(H5C_NOTIFY_ACTION_CHILD_CLEANED, parent_entry) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry dirty flag reset")
    } /* end if */

    /* adjust parent entry's number of unserialized children */
    if (!child_entry->image_up_to_date) {
        assert(parent_entry->flush_dep_nunser_children > 0);

        parent_entry->flush_dep_nunser_children--;

        /* If the parent has a 'notify' callback, send a 'child entry serialized' notice */
        if (parent_entry->type->notify &&
            (parent_entry->type->notify)(H5C_NOTIFY_ACTION_CHILD_SERIALIZED, parent_entry) < 0)
            HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL,
                        "can't notify parent about child entry serialized flag set")
    } /* end if */

    /* Shrink or free the parent array if appropriate */
    if (child_entry->flush_dep_nparents == 0) {
        child_entry->flush_dep_parent = H5FL_SEQ_FREE(H5C_cache_entry_ptr_t, child_entry->flush_dep_parent);
        child_entry->flush_dep_parent_nalloc = 0;
    } /* end if */
    else if (child_entry->flush_dep_parent_nalloc > H5C_FLUSH_DEP_PARENT_INIT &&
             child_entry->flush_dep_nparents <= (child_entry->flush_dep_parent_nalloc / 4)) {
        if (NULL == (child_entry->flush_dep_parent =
                         H5FL_SEQ_REALLOC(H5C_cache_entry_ptr_t, child_entry->flush_dep_parent,
                                          child_entry->flush_dep_parent_nalloc / 4)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL,
                        "memory allocation failed for flush dependency parent list")
        child_entry->flush_dep_parent_nalloc /= 4;
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_destroy_flush_dependency() */

/*-------------------------------------------------------------------------
 * Function:    H5C_expunge_entry
 *
 * Purpose:     Expunge an entry from the cache without writing it to disk
 *              even if it is dirty.  The entry may not be either pinned or
 *              protected.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  John Mainzer
 *              6/29/06
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_expunge_entry(H5F_t *f, const H5C_class_t *type, haddr_t addr, unsigned flags)
{
    H5C_t             *cache_ptr;
    H5C_cache_entry_t *entry_ptr   = NULL;
    unsigned           flush_flags = (H5C__FLUSH_INVALIDATE_FLAG | H5C__FLUSH_CLEAR_ONLY_FLAG);
    herr_t             ret_value   = SUCCEED; /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    assert(f);
    assert(f->shared);
    cache_ptr = f->shared->cache;
    assert(cache_ptr);
    assert(type);
    assert(H5_addr_defined(addr));

#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_lru_list(cache_ptr) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "LRU extreme sanity check failed on entry")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    /* Look for entry in cache */
    H5C__SEARCH_INDEX(cache_ptr, addr, entry_ptr, FAIL)
    if ((entry_ptr == NULL) || (entry_ptr->type != type))
        /* the target doesn't exist in the cache, so we are done. */
        HGOTO_DONE(SUCCEED)

    assert(entry_ptr->addr == addr);
    assert(entry_ptr->type == type);

    /* Check for entry being pinned or protected */
    if (entry_ptr->is_protected)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, "Target entry is protected")
    if (entry_ptr->is_pinned)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, "Target entry is pinned")

    /* If we get this far, call H5C__flush_single_entry() with the
     * H5C__FLUSH_INVALIDATE_FLAG and the H5C__FLUSH_CLEAR_ONLY_FLAG.
     * This will clear the entry, and then delete it from the cache.
     */

    /* Pass along 'free file space' flag */
    flush_flags |= (flags & H5C__FREE_FILE_SPACE_FLAG);

    /* Delete the entry from the skip list on destroy */
    flush_flags |= H5C__DEL_FROM_SLIST_ON_DESTROY_FLAG;

    if (H5C__flush_single_entry(f, entry_ptr, flush_flags) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTEXPUNGE, FAIL, "can't flush entry")

done:
#ifdef H5C_DO_EXTREME_SANITY_CHECKS
    if (H5C__validate_lru_list(cache_ptr) < 0)
        HDONE_ERROR(H5E_CACHE, H5E_SYSTEM, FAIL, "LRU extreme sanity check failed on exit")
#endif /* H5C_DO_EXTREME_SANITY_CHECKS */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C_expunge_entry() */

/*-------------------------------------------------------------------------
 * Function:    H5C_remove_entry
 *
 * Purpose:     Remove an entry from the cache.  Must be not protected, pinned,
 *        dirty, involved in flush dependencies, etc.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 * Programmer:  Quincey Koziol
 *              September 17, 2016
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5C_remove_entry(void *_entry)
{
    H5C_cache_entry_t *entry = (H5C_cache_entry_t *)_entry; /* Entry to remove */
    H5C_t             *cache;                               /* Cache for file */
    herr_t             ret_value = SUCCEED;                 /* Return value */

    FUNC_ENTER_NOAPI(FAIL)

    /* Sanity checks */
    assert(entry);
    assert(entry->ring != H5C_RING_UNDEFINED);
    cache = entry->cache_ptr;
    assert(cache);

    /* Check for error conditions */
    if (entry->is_dirty)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove dirty entry from cache")
    if (entry->is_protected)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove protected entry from cache")
    if (entry->is_pinned)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove pinned entry from cache")
    /* NOTE: If these two errors are getting tripped because the entry is
     *          in a flush dependency with a freedspace entry, move the checks
     *          after the "before evict" message is sent, and add the
     *          "child being evicted" message to the "before evict" notify
     *          section below.  QAK - 2017/08/03
     */
    if (entry->flush_dep_nparents > 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL,
                    "can't remove entry with flush dependency parents from cache")
    if (entry->flush_dep_nchildren > 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL,
                    "can't remove entry with flush dependency children from cache")

    /* Additional internal cache consistency checks */
    assert(!entry->in_slist);
    assert(!entry->flush_marker);
    assert(!entry->flush_in_progress);

    /* Note that the algorithm below is (very) similar to the set of operations
     * in H5C__flush_single_entry() and should be kept in sync with changes
     * to that code. - QAK, 2016/11/30
     */

    /* Update stats, as if we are "destroying" and taking ownership of the entry */
    H5C__UPDATE_STATS_FOR_EVICTION(cache, entry, TRUE)

    /* If the entry's type has a 'notify' callback, send a 'before eviction'
     * notice while the entry is still fully integrated in the cache.
     */
    if (entry->type->notify && (entry->type->notify)(H5C_NOTIFY_ACTION_BEFORE_EVICT, entry) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTNOTIFY, FAIL, "can't notify client about entry to evict")

    /* Update the cache internal data structures as appropriate for a destroy.
     * Specifically:
     *    1) Delete it from the index
     *    2) Delete it from the collective read access list
     *    3) Update the replacement policy for eviction
     *    4) Remove it from the tag list for this object
     */

    H5C__DELETE_FROM_INDEX(cache, entry, FAIL);

#ifdef H5_HAVE_PARALLEL
    /* Check for collective read access flag */
    if (entry->coll_access) {
        entry->coll_access = FALSE;
        H5C__REMOVE_FROM_COLL_LIST(cache, entry, FAIL)
    }  /* end if */
#endif /* H5_HAVE_PARALLEL */

    H5C__UPDATE_RP_FOR_EVICTION(cache, entry, FAIL)

    /* Remove entry from tag list */
    if (H5C__untag_entry(cache, entry) < 0)
        HGOTO_ERROR(H5E_CACHE, H5E_CANTREMOVE, FAIL, "can't remove entry from tag list")

    /* Increment entries_removed_counter and set last_entry_removed_ptr.
     * As we me be about to free the entry, recall that last_entry_removed_ptr
     * must NEVER be dereferenced.
     *
     * Recall that these fields are maintained to allow functions that perform
     * scans of lists of entries to detect the unexpected removal of entries
     * (via expunge, eviction, or take ownership at present), so that they can
     * re-start their scans if necessary.
     *
     * Also check if the entry we are watching for removal is being
     * removed (usually the 'next' entry for an iteration) and reset
     * it to indicate that it was removed.
     */
    cache->entries_removed_counter++;
    cache->last_entry_removed_ptr = entry;
    if (entry == cache->entry_watched_for_removal)
        cache->entry_watched_for_removal = NULL;

    /* Internal cache data structures should now be up to date, and
     * consistent with the status of the entry.
     *
     * Now clean up internal cache fields if appropriate.
     */

    /* Free the buffer for the on disk image */
    if (entry->image_ptr != NULL)
        entry->image_ptr = H5MM_xfree(entry->image_ptr);

    /* Reset the pointer to the cache the entry is within */
    entry->cache_ptr = NULL;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5C__remove_entry() */