summaryrefslogtreecommitdiffstats
path: root/src/H5FSsection.c
blob: 26ff7b954d86a3efe4d9f0d6eca9dd833918ac82 (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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdfgroup.org/HDF5/doc/Copyright.html.  If you do not have          *
 * access to either file, you may request a copy from help@hdfgroup.org.     *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer:	Quincey Koziol <koziol@hdfgroup.org>
 *              Monday, July 31, 2006
 *
 * Purpose:	Free space tracking functions.
 *
 */

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

#define H5FS_PACKAGE		/*suppress error about including H5FSpkg  */


/***********/
/* Headers */
/***********/
#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5FSpkg.h"		/* File free space			*/
#include "H5MFprivate.h"	/* File memory management		*/
#include "H5Vprivate.h"		/* Vectors and arrays 			*/


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


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

/* User data for skip list iterator callback for iterating over section size nodes */
typedef struct {
    H5FS_t *fspace;             /* Free space manager info */
    H5FS_operator_t op;         /* Operator for the iteration */
    void *op_data;              /* Information to pass to the operator */
} H5FS_iter_ud_t;


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


/********************/
/* Local Prototypes */
/********************/
static herr_t H5FS_sect_increase(H5FS_t *fspace, const H5FS_section_class_t *cls,
    unsigned flags);
static herr_t H5FS_sect_decrease(H5FS_t *fspace, const H5FS_section_class_t *cls);
static herr_t H5FS_size_node_decr(H5FS_sinfo_t *sinfo, unsigned bin, H5FS_node_t *fspace_node,
    const H5FS_section_class_t *cls);
static herr_t H5FS_sect_unlink_size(H5FS_sinfo_t *sinfo, const H5FS_section_class_t *cls,
    H5FS_section_info_t *sect);
static herr_t H5FS_sect_unlink_rest(H5FS_t *fspace,
    const H5FS_section_class_t *cls, H5FS_section_info_t *sect);
static herr_t H5FS_sect_remove_real(H5FS_t *fspace, H5FS_section_info_t *sect);
static herr_t H5FS_sect_link_size(H5FS_sinfo_t *sinfo, const H5FS_section_class_t *cls,
    H5FS_section_info_t *sect);
static herr_t H5FS_sect_link_rest(H5FS_t *fspace, const H5FS_section_class_t *cls,
    H5FS_section_info_t *sect, unsigned flags);
static herr_t H5FS_sect_link(H5FS_t *fspace, H5FS_section_info_t *sect,
    unsigned flags);
static herr_t H5FS_sect_merge(H5FS_t *fspace, H5FS_section_info_t **sect,
    void *op_data);
static htri_t H5FS_sect_find_node(H5FS_t *fspace, hsize_t request, H5FS_section_info_t **node);
static herr_t H5FS_sect_serialize_size(H5FS_t *fspace);


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

/* Declare a free list to manage the H5FS_node_t struct */
H5FL_DEFINE(H5FS_node_t);

/* Declare a free list to manage the H5FS_bin_t sequence information */
H5FL_SEQ_DEFINE(H5FS_bin_t);

/* Declare a free list to manage the H5FS_sinfo_t struct */
H5FL_DEFINE(H5FS_sinfo_t);


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


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



/*-------------------------------------------------------------------------
 * Function:	H5FS_sinfo_new
 *
 * Purpose:	Create new section info structure
 *
 * Return:	Success:	non-NULL, pointer to new section info struct
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Monday, July 31, 2006
 *
 *-------------------------------------------------------------------------
 */
H5FS_sinfo_t *
H5FS_sinfo_new(H5F_t *f, H5FS_t *fspace)
{
    H5FS_sinfo_t *sinfo = NULL; /* Section information struct created */
    H5FS_sinfo_t *ret_value;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sinfo_new)

    /* Check arguments. */
    HDassert(f);
    HDassert(fspace);
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: fspace->addr = %a\n", FUNC, fspace->addr);
#endif /* H5FS_SINFO_DEBUG */

    /* Allocate the free space header */
    if(NULL == (sinfo = H5FL_CALLOC(H5FS_sinfo_t)))
	HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed")

    /* Set non-zero values */
    sinfo->nbins = H5V_log2_gen(fspace->max_sect_size);
    sinfo->sect_prefix_size = H5FS_SINFO_PREFIX_SIZE(f);
    sinfo->sect_off_size = (fspace->max_sect_addr + 7) / 8;
    sinfo->sect_len_size = H5V_limit_enc_size((uint64_t)fspace->max_sect_size);
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: fspace->max_sect_size = %Hu\n", FUNC, fspace->max_sect_size);
HDfprintf(stderr, "%s: fspace->max_sect_addr = %u\n", FUNC, fspace->max_sect_addr);
HDfprintf(stderr, "%s: sinfo->nbins = %u\n", FUNC, sinfo->nbins);
HDfprintf(stderr, "%s: sinfo->sect_off_size = %u, sinfo->sect_len_size = %u\n", FUNC, sinfo->sect_off_size, sinfo->sect_len_size);
#endif /* H5FS_SINFO_DEBUG */

    /* Allocate space for the section size bins */
    if(NULL == (sinfo->bins = H5FL_SEQ_CALLOC(H5FS_bin_t, (size_t)sinfo->nbins)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "memory allocation failed for free space section bin array")

    /* Increment the reference count on the free space manager header */
    if(H5FS_incr(f, fspace) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTINC, NULL, "unable to increment ref. count on free space header")
    sinfo->fspace = fspace;

    /* Link free space manager to section info */
    /* (for deserializing sections) */
    HDassert(fspace->sinfo == NULL);
    fspace->sinfo = sinfo;

    /* Set return value */
    ret_value = sinfo;

done:
    if(ret_value == NULL && sinfo) {
        /* Release bins for skip lists */
        if(sinfo->bins)
            sinfo->bins = H5FL_SEQ_FREE(H5FS_bin_t, sinfo->bins);

        /* Release free space section info */
        sinfo = H5FL_FREE(H5FS_sinfo_t, sinfo);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sinfo_new() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sinfo_lock
 *
 * Purpose:	Make certain the section info for the free space manager is
 *              in memory.
 *
 *              Either uses existing section info owned by the free space
 *              header, loads section info from disk, or creates new section
 *              info
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Thursday, February  7, 2008
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sinfo_lock(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace, H5AC_protect_t accmode)
{
    herr_t ret_value = SUCCEED;    /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sinfo_lock)
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Called, fspace->addr = %a, fspace->sinfo = %p, fspace->sect_addr = %a\n", FUNC, fspace->addr, fspace->sinfo, fspace->sect_addr);
HDfprintf(stderr, "%s: fspace->alloc_sect_size = %Hu, fspace->sect_size = %Hu\n", FUNC, fspace->alloc_sect_size, fspace->sect_size);
#endif /* H5FS_SINFO_DEBUG */

    /* Check arguments. */
    HDassert(f);
    HDassert(fspace);

    /* If the free space header doesn't already "own" the section info, load
     *  section info or create it
     */
    if(fspace->sinfo) {
        /* Check if the section info was protected & we want a different access mode */
        if(fspace->sinfo_protected && accmode != fspace->sinfo_accmode) {
            /* Check if we need to switch from read-only access to read-write */
            if(H5AC_WRITE == accmode) {
                /* Unprotect the read-only section info */
                if(H5AC_unprotect(f, dxpl_id, H5AC_FSPACE_SINFO, fspace->sect_addr, fspace->sinfo, H5AC__NO_FLAGS_SET) < 0)
                    HGOTO_ERROR(H5E_FSPACE, H5E_CANTUNPROTECT, FAIL, "unable to release free space section info")

                /* Re-protect the section info with read-write access */
                if(NULL == (fspace->sinfo = (H5FS_sinfo_t *)H5AC_protect(f, dxpl_id, H5AC_FSPACE_SINFO, fspace->sect_addr, NULL, fspace, H5AC_WRITE)))
                    HGOTO_ERROR(H5E_FSPACE, H5E_CANTPROTECT, FAIL, "unable to load free space sections")

                /* Switch the access mode we have */
                fspace->sinfo_accmode = H5AC_WRITE;
            } /* end if */
        } /* end if */
    } /* end if */
    else {
        /* If the section address is defined, load it from the file */
        if(H5F_addr_defined(fspace->sect_addr)) {
            /* Sanity check */
            HDassert(fspace->sinfo_protected == FALSE);
            HDassert(H5F_addr_defined(fspace->addr));

#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Reading in existing sections, fspace->sect_addr = %a\n", FUNC, fspace->sect_addr);
#endif /* H5FS_SINFO_DEBUG */
            /* Protect the free space sections */
            if(NULL == (fspace->sinfo = (H5FS_sinfo_t *)H5AC_protect(f, dxpl_id, H5AC_FSPACE_SINFO, fspace->sect_addr, NULL, fspace, accmode)))
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTPROTECT, FAIL, "unable to load free space sections")

            /* Remember that we protected the section info & the access mode */
            fspace->sinfo_protected = TRUE;
            fspace->sinfo_accmode = accmode;
        } /* end if */
        else {
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Creating new section info\n", FUNC);
#endif /* H5FS_SINFO_DEBUG */
            /* Sanity check */
            HDassert(fspace->tot_sect_count == 0);
            HDassert(fspace->serial_sect_count == 0);
            HDassert(fspace->ghost_sect_count == 0);

            /* Allocate and initialize free space section info */
            if(NULL == (fspace->sinfo = H5FS_sinfo_new(f, fspace)))
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTCREATE, FAIL, "can't create section info")

            /* Set initial size of section info to 0 */
            fspace->sect_size = fspace->alloc_sect_size = 0;
        } /* end if */
    } /* end if */
    HDassert(fspace->rc == 2);

    /* Increment the section info lock count */
    fspace->sinfo_lock_count++;

done:
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Leaving, fspace->addr = %a, fspace->sinfo = %p, fspace->sect_addr = %a\n", FUNC, fspace->addr, fspace->sinfo, fspace->sect_addr);
HDfprintf(stderr, "%s: fspace->alloc_sect_size = %Hu, fspace->sect_size = %Hu\n", FUNC, fspace->alloc_sect_size, fspace->sect_size);
#endif /* H5FS_SINFO_DEBUG */
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sinfo_lock() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sinfo_unlock
 *
 * Purpose:	Release the section info, either giving ownership back to
 *              the cache or letting the free space header keep it.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Thursday, February  7, 2008
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sinfo_unlock(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace, hbool_t modified)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sinfo_unlock)
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Called, modified = %t, fspace->addr = %a, fspace->sect_addr = %a\n", FUNC, modified, fspace->addr, fspace->sect_addr);
HDfprintf(stderr, "%s: fspace->sinfo_lock_count = %u, fspace->sinfo_modified = %t, fspace->sinfo_protected = %t\n", FUNC, fspace->sinfo_lock_count, fspace->sinfo_modified, fspace->sinfo_protected);
HDfprintf(stderr, "%s: fspace->alloc_sect_size = %Hu, fspace->sect_size = %Hu\n", FUNC, fspace->alloc_sect_size, fspace->sect_size);
#endif /* H5FS_SINFO_DEBUG */

    /* Check arguments. */
    HDassert(f);
    HDassert(fspace);
    HDassert(fspace->rc == 2);
    HDassert(fspace->sinfo);

    /* Check if we modified any section */
    if(modified) {
        /* Check if the section info was protected with a different access mode */
        if(fspace->sinfo_protected && fspace->sinfo_accmode != H5AC_WRITE)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTDIRTY, FAIL, "attempt to modify read-only section info")

        /* If we modified the section info, mark it dirty */
        fspace->sinfo->dirty = TRUE;

        /* Remember that the section info was modified while locked */
        fspace->sinfo_modified = TRUE;

        /* Assume that the modification will affect the statistics in the header
         *  and mark that dirty also
         */
        if(H5FS_dirty(f, fspace) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTMARKDIRTY, FAIL, "unable to mark free space header as dirty")
    } /* end if */

    /* Decrement the lock count on the section info */
    fspace->sinfo_lock_count--;

    /* Check if section info lock count dropped to zero */
    if(fspace->sinfo_lock_count == 0) {
        hbool_t release_sinfo_space = FALSE;    /* Flag to indicate section info space in file should be released */

        /* Check if we actually protected the section info */
        if(fspace->sinfo_protected) {
            unsigned    cache_flags = H5AC__NO_FLAGS_SET;       /* Flags for unprotecting heap */

            /* Sanity check */
            HDassert(H5F_addr_defined(fspace->addr));

            /* Check if we've made new changes to the section info while locked */
            if(fspace->sinfo_modified) {
                /* Note that we've modified the section info */
                cache_flags |= H5AC__DIRTIED_FLAG;

                /* Check if the section info size in the file has changed */
                if(fspace->sect_size != fspace->alloc_sect_size)
                    cache_flags |= H5AC__SIZE_CHANGED_FLAG | H5AC__DELETED_FLAG | H5AC__TAKE_OWNERSHIP_FLAG;
            } /* end if */

            /* Sanity check */
            HDassert(H5F_addr_defined(fspace->sect_addr));

            /* Unprotect section info in cache */
            /* (Possibly dirty) */
            /* (Possibly taking ownership from the cache) */
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Unprotecting section info, cache_flags = %u\n", FUNC, cache_flags);
#endif /* H5FS_SINFO_DEBUG */
            if(H5AC_unprotect(f, dxpl_id, H5AC_FSPACE_SINFO, fspace->sect_addr, fspace->sinfo, cache_flags) < 0)
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTUNPROTECT, FAIL, "unable to release free space section info")

            /* Reset the protected flag on the section info */
            fspace->sinfo_protected = FALSE;

            /* Check if header is taking ownership of section info */
            if((cache_flags & H5AC__TAKE_OWNERSHIP_FLAG)) {
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Taking ownership of section info\n", FUNC);
#endif /* H5FS_SINFO_DEBUG */
                /* Set flag to release section info space in file */
                release_sinfo_space = TRUE;
            } /* end if */
            else {
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Relinquishing section info ownership\n", FUNC);
#endif /* H5FS_SINFO_DEBUG */
                /* Free space header relinquished ownership of section info */
                fspace->sinfo = NULL;
            } /* end else */
        } /* end if */
        else {
            /* Check if the section info was modified */
            if(fspace->sinfo_modified) {
                /* Check if we need to release section info in the file */
                if(H5F_addr_defined(fspace->sect_addr))
                    /* Set flag to release section info space in file */
                    release_sinfo_space = TRUE;
                else
                    HDassert(fspace->alloc_sect_size == 0);
            } /* end if */
            else {
                /* Sanity checks... */
                if(H5F_addr_defined(fspace->sect_addr))
                    HDassert(fspace->alloc_sect_size == fspace->sect_size);
                else
                    HDassert(fspace->alloc_sect_size == 0);
            } /* end else */
        } /* end else */

        /* Reset the "section info modified" flag */
        fspace->sinfo_modified = FALSE;

        /* Check if header needs to release section info in the file */
        if(release_sinfo_space) {
            haddr_t old_sect_addr = fspace->sect_addr;   /* Previous location of section info in file */
            hsize_t old_alloc_sect_size = fspace->alloc_sect_size;       /* Previous size of section info in file */

            /* Sanity check */
            HDassert(H5F_addr_defined(fspace->addr));

            /* Reset section info in header */
            fspace->sect_addr = HADDR_UNDEF;
            fspace->alloc_sect_size = 0;

            /* If we haven't already marked the header dirty, do so now */
            if(!modified)
                if(H5FS_dirty(f, fspace) < 0)
                    HGOTO_ERROR(H5E_FSPACE, H5E_CANTMARKDIRTY, FAIL, "unable to mark free space header as dirty")

#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Freeing section info on disk, old_sect_addr = %a, old_alloc_sect_size = %Hu\n", FUNC, old_sect_addr, old_alloc_sect_size);
#endif /* H5FS_SINFO_DEBUG */
            /* Release space for section info in file */
            if(H5MF_xfree(f, H5FD_MEM_FSPACE_SINFO, dxpl_id, old_sect_addr, old_alloc_sect_size) < 0)
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTFREE, FAIL, "unable to free free space sections")
        } /* end if */
    } /* end if */

done:
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Leaving, ret_value = %d\n", FUNC, ret_value);
#endif /* H5FS_SINFO_DEBUG */
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sinfo_unlock() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_serialize_size
 *
 * Purpose:	Determine serialized size of all sections in free space manager
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, May  8, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_serialize_size(H5FS_t *fspace)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5FS_sect_serialize_size)

    /* Check arguments. */
    HDassert(fspace);
#ifdef QAK
HDfprintf(stderr, "%s: Check 1.0 - fspace->sect_size = %Hu\n", "H5FS_sect_serialize_size", fspace->sect_size);
HDfprintf(stderr, "%s: fspace->serial_sect_count = %Zu\n", "H5FS_sect_serialize_size", fspace->serial_sect_count);
HDfprintf(stderr, "%s: fspace->alloc_sect_size = %Hu\n", "H5FS_sect_serialize_size", fspace->alloc_sect_size);
HDfprintf(stderr, "%s: fspace->sinfo->serial_size_count = %Zu\n", "H5FS_sect_serialize_size", fspace->sinfo->serial_size_count);
#endif /* QAK */

    /* Compute the size of the buffer required to serialize all the sections */
    if(fspace->serial_sect_count > 0) {
        size_t sect_buf_size;               /* Section buffer size */

        /* Serialized sections prefix */
        sect_buf_size = fspace->sinfo->sect_prefix_size;

        /* Count for each differently sized serializable section */
#ifdef QAK
HDfprintf(stderr, "%s: fspace->sinfo->serial_size_count = %Zu\n", "H5FS_sect_serialize_size", fspace->sinfo->serial_size_count);
HDfprintf(stderr, "%s: fspace->serial_sect_count = %Hu\n", "H5FS_sect_serialize_size", fspace->serial_sect_count);
#endif /* QAK */
        sect_buf_size += fspace->sinfo->serial_size_count * H5V_limit_enc_size((uint64_t)fspace->serial_sect_count);

        /* Size for each differently sized serializable section */
        sect_buf_size += fspace->sinfo->serial_size_count * fspace->sinfo->sect_len_size;

        /* Offsets of each section in address space */
        sect_buf_size += fspace->serial_sect_count * fspace->sinfo->sect_off_size;

        /* Class of each section */
        sect_buf_size += fspace->serial_sect_count * 1 /* byte */;

        /* Extra space required to serialize each section */
        sect_buf_size += fspace->sinfo->serial_size;

        /* Update section size in header */
        fspace->sect_size = sect_buf_size;
    } /* end if */
    else
        /* Reset section size in header */
        fspace->sect_size = fspace->sinfo->sect_prefix_size;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5FS_sect_serialize_size() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_increase
 *
 * Purpose:	Increase the size of the serialized free space section info
 *              on disk
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, May  8, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_increase(H5FS_t *fspace, const H5FS_section_class_t *cls,
    unsigned flags)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_increase)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->sinfo);
    HDassert(cls);

    /* Increment total # of sections on free space list */
    fspace->tot_sect_count++;

    /* Check for serializable or 'ghost' section */
    if(cls->flags & H5FS_CLS_GHOST_OBJ) {
        /* Sanity check */
        HDassert(cls->serial_size == 0);

        /* Increment # of ghost sections */
        fspace->ghost_sect_count++;
    } /* end if */
    else {
        /* Increment # of serializable sections */
        fspace->serial_sect_count++;

        /* Increment amount of space required to serialize all sections */
#ifdef QAK
HDfprintf(stderr, "%s: sinfo->serial_size = %Zu\n", FUNC, sinfo->serial_size);
HDfprintf(stderr, "%s: cls->serial_size = %Zu\n", FUNC, cls->serial_size);
#endif /* QAK */
        fspace->sinfo->serial_size += cls->serial_size;

        /* Update the free space sections' serialized size */
        /* (if we're not deserializing the sections from disk) */
        if(!(flags & H5FS_ADD_DESERIALIZING)) {
            if(H5FS_sect_serialize_size(fspace) < 0)
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTCOMPUTE, FAIL, "can't adjust free space section size on disk")
        } /* end if */
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_increase() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_decrease
 *
 * Purpose:	Decrease the size of the serialized free space section info
 *              on disk
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, May  8, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_decrease(H5FS_t *fspace, const H5FS_section_class_t *cls)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_decrease)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->sinfo);
    HDassert(cls);

    /* Decrement total # of sections in free space manager */
    fspace->tot_sect_count--;

    /* Check for serializable or 'ghost' section */
    if(cls->flags & H5FS_CLS_GHOST_OBJ) {
        /* Sanity check */
        HDassert(cls->serial_size == 0);

        /* Decrement # of ghost sections */
        fspace->ghost_sect_count--;
    } /* end if */
    else {
        /* Decrement # of serializable sections */
        fspace->serial_sect_count--;

        /* Decrement amount of space required to serialize all sections */
#ifdef QAK
HDfprintf(stderr, "%s: fspace->serial_size = %Zu\n", FUNC, fspace->serial_size);
HDfprintf(stderr, "%s: cls->serial_size = %Zu\n", FUNC, cls->serial_size);
#endif /* QAK */
        fspace->sinfo->serial_size -= cls->serial_size;

        /* Update the free space sections' serialized size */
        if(H5FS_sect_serialize_size(fspace) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTCOMPUTE, FAIL, "can't adjust free space section size on disk")
    } /* end else */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_decrease() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_size_node_decr
 *
 * Purpose:	Decrement the number of sections of a particular size
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_size_node_decr(H5FS_sinfo_t *sinfo, unsigned bin, H5FS_node_t *fspace_node,
    const H5FS_section_class_t *cls)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_size_node_decr)

    /* Check arguments. */
    HDassert(sinfo);
    HDassert(fspace_node);
    HDassert(cls);

    /* Decrement the # of sections in this bin */
    /* (Different from the # of items in the bin's skiplist, since each node on
     *  the bin's skiplist is also a skiplist...)
     */
    sinfo->bins[bin].tot_sect_count--;
#ifdef QAK
HDfprintf(stderr, "%s: sinfo->bins[%u].sect_count = %Zu\n", FUNC, bin, sinfo->bins[bin].sect_count);
#endif /* QAK */

    /* Check for 'ghost' or 'serializable' section */
    if(cls->flags & H5FS_CLS_GHOST_OBJ) {
        /* Decrement node's ghost section count */
        fspace_node->ghost_count--;

        /* Decrement bin's ghost section count */
        sinfo->bins[bin].ghost_sect_count--;

        /* If the node has no more ghost sections, decrement number of ghost section sizes managed */
        if(fspace_node->ghost_count == 0)
            sinfo->ghost_size_count--;
    } /* end if */
    else {
        /* Decrement node's serializable section count */
        fspace_node->serial_count--;

        /* Decrement bin's serializable section count */
        sinfo->bins[bin].serial_sect_count--;

        /* If the node has no more serializable sections, decrement number of serializable section sizes managed */
        if(fspace_node->serial_count == 0)
            sinfo->serial_size_count--;
    } /* end else */

    /* Check for no more nodes on list of that size */
    if(H5SL_count(fspace_node->sect_list) == 0) {
        H5FS_node_t *tmp_fspace_node;       /* Free space list size node */

        /* Sanity checks */
        HDassert(fspace_node->ghost_count == 0);
        HDassert(fspace_node->serial_count == 0);

        /* Remove size tracking list from bin */
        tmp_fspace_node = (H5FS_node_t *)H5SL_remove(sinfo->bins[bin].bin_list, &fspace_node->sect_size);
        if(tmp_fspace_node == NULL || tmp_fspace_node != fspace_node)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTREMOVE, FAIL, "can't remove free space node from skip list")

        /* Destroy skip list for size tracking node */
        if(H5SL_close(fspace_node->sect_list) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTCLOSEOBJ, FAIL, "can't destroy size tracking node's skip list")

        /* Release free space list node */
        (void)H5FL_FREE(H5FS_node_t, fspace_node);

        /* Decrement total number of section sizes managed */
        sinfo->tot_size_count--;
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_size_node_decr() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_unlink_size
 *
 * Purpose:	Remove a section node from size tracking data structures for
 *              a free space manager
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_unlink_size(H5FS_sinfo_t *sinfo, const H5FS_section_class_t *cls,
    H5FS_section_info_t *sect)
{
    H5FS_node_t *fspace_node;       /* Free list size node */
    H5FS_section_info_t *tmp_sect_node; /* Temporary section node */
    unsigned bin;                   /* Bin to put the free space section in */
    herr_t ret_value = SUCCEED;     /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_unlink_size)

    /* Check arguments. */
    HDassert(sinfo);
    HDassert(sinfo->bins);
    HDassert(sect);
    HDassert(cls);

    /* Determine correct bin which holds items of at least the section's size */
    bin = H5V_log2_gen(sect->size);
    HDassert(bin < sinfo->nbins);
    if(sinfo->bins[bin].bin_list == NULL)
        HGOTO_ERROR(H5E_FSPACE, H5E_NOTFOUND, FAIL, "node's bin is empty?")

    /* Find space node for section's size */
    if((fspace_node = (H5FS_node_t *)H5SL_search(sinfo->bins[bin].bin_list, &sect->size)) == NULL)
        HGOTO_ERROR(H5E_FSPACE, H5E_NOTFOUND, FAIL, "can't find section size node")

    /* Remove the section's node from the list */
    tmp_sect_node = (H5FS_section_info_t *)H5SL_remove(fspace_node->sect_list, &sect->addr);
    if(tmp_sect_node == NULL || tmp_sect_node != sect)
        HGOTO_ERROR(H5E_FSPACE, H5E_NOTFOUND, FAIL, "can't find section node on size list")

    /* Decrement # of sections in section size node */
    if(H5FS_size_node_decr(sinfo, bin, fspace_node, cls) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTREMOVE, FAIL, "can't remove free space size node from skip list")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_unlink_size() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_unlink_rest
 *
 * Purpose:	Finish unlinking a section from the rest of the free space
 *              manager's data structures, after the section has been removed
 *              from the size tracking data structures
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_unlink_rest(H5FS_t *fspace, const H5FS_section_class_t *cls,
    H5FS_section_info_t *sect)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_unlink_rest)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->sinfo);
    HDassert(cls);
    HDassert(sect);

    /* Remove node from merge list, if it was entered there */
    if(!(cls->flags & H5FS_CLS_SEPAR_OBJ)) {
        H5FS_section_info_t *tmp_sect_node; /* Temporary section node */

#ifdef QAK
HDfprintf(stderr, "%s: removing object from merge list, sect->type = %u\n", FUNC, (unsigned)sect->type);
#endif /* QAK */
        tmp_sect_node = (H5FS_section_info_t *)H5SL_remove(fspace->sinfo->merge_list, &sect->addr);
        if(tmp_sect_node == NULL || tmp_sect_node != sect)
            HGOTO_ERROR(H5E_FSPACE, H5E_NOTFOUND, FAIL, "can't find section node on size list")
    } /* end if */

    /* Update section info & check if we need less room for the serialized free space sections */
    if(H5FS_sect_decrease(fspace, cls) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't increase free space section size on disk")

    /* Decrement amount of free space managed */
#ifdef QAK
HDfprintf(stderr, "%s: fspace->tot_space = %Hu\n", FUNC, fspace->tot_space);
#endif /* QAK */
    fspace->tot_space -= sect->size;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_unlink_rest() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_remove_real
 *
 * Purpose:	Remove a section from the free space manager
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_remove_real(H5FS_t *fspace, H5FS_section_info_t *sect)
{
    const H5FS_section_class_t *cls;    /* Class of section */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_remove_real)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->sinfo);
    HDassert(sect);

    /* Get section's class */
    cls = &fspace->sect_cls[sect->type];

    /* Remove node from size tracked data structures */
    if(H5FS_sect_unlink_size(fspace->sinfo, cls, sect) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTFREE, FAIL, "can't remove section from size tracking data structures")

    /* Update rest of free space manager data structures for node removal */
    if(H5FS_sect_unlink_rest(fspace, cls, sect) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTFREE, FAIL, "can't remove section from non-size tracking data structures")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_remove_real() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_remove
 *
 * Purpose:	Remove a section from the free space manager
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5FS_sect_remove(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace,
    H5FS_section_info_t *sect)
{
    hbool_t sinfo_valid = FALSE;        /* Whether the section info is valid */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_remove)

    /* Check arguments. */
    HDassert(f);
    HDassert(fspace);
    HDassert(sect);

    /* Get a pointer to the section info */
    if(H5FS_sinfo_lock(f, dxpl_id, fspace, H5AC_WRITE) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTGET, FAIL, "can't get section info")
    sinfo_valid = TRUE;

    /* Perform actual section removal */
    if(H5FS_sect_remove_real(fspace, sect) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTREMOVE, FAIL, "can't remove section")

done:
    /* Release the section info */
    if(sinfo_valid && H5FS_sinfo_unlock(f, dxpl_id, fspace, TRUE) < 0)
        HDONE_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't release section info")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_remove() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_link_size
 *
 * Purpose:	Add a section of free space to the free list bins
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, March 20, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_link_size(H5FS_sinfo_t *sinfo, const H5FS_section_class_t *cls,
    H5FS_section_info_t *sect)
{
    H5FS_node_t *fspace_node = NULL;     /* Pointer to free space node of the correct size */
    unsigned bin;                       /* Bin to put the free space section in */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_link_size)
#ifdef QAK
HDfprintf(stderr, "%s: sect->size = %Hu, sect->addr = %a\n", FUNC, sect->size, sect->addr);
#endif /* QAK */

    /* Check arguments. */
    HDassert(sinfo);
    HDassert(sect);
    HDassert(H5F_addr_defined(sect->addr));
    HDassert(sect->size);

    /* Determine correct bin which holds items of the section's size */
    bin = H5V_log2_gen(sect->size);
    HDassert(bin < sinfo->nbins);
    if(sinfo->bins[bin].bin_list == NULL) {
        if(NULL == (sinfo->bins[bin].bin_list = H5SL_create(H5SL_TYPE_HSIZE)))
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTCREATE, FAIL, "can't create skip list for free space nodes")
    } /* end if */
    else {
        /* Check for node list of the correct size already */
        fspace_node = (H5FS_node_t *)H5SL_search(sinfo->bins[bin].bin_list, &sect->size);
    } /* end else */

    /* Check if we need to create a new skip list for nodes of this size */
    if(fspace_node == NULL) {
        /* Allocate new free list size node */
        if(NULL == (fspace_node = H5FL_MALLOC(H5FS_node_t)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, FAIL, "memory allocation failed for free space node")

        /* Initialize the free list size node */
        fspace_node->sect_size = sect->size;
        fspace_node->serial_count = fspace_node->ghost_count = 0;
        if(NULL == (fspace_node->sect_list = H5SL_create(H5SL_TYPE_HADDR)))
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTCREATE, FAIL, "can't create skip list for free space nodes")

        /* Insert new free space size node into bin's list */
        if(H5SL_insert(sinfo->bins[bin].bin_list, fspace_node, &fspace_node->sect_size) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't insert free space node into skip list")

        /* Increment number of section sizes */
        sinfo->tot_size_count++;
    } /* end if */

    /* Increment # of section in bin */
    /* (Different from the # of items in the bin's skiplist, since each node on
     *  the bin's skiplist is also a skiplist...)
     */
#ifdef QAK
HDfprintf(stderr, "%s: sinfo->bins[%u].sect_count = %Zu\n", FUNC, bin, sinfo->bins[bin].sect_count);
#endif /* QAK */
    sinfo->bins[bin].tot_sect_count++;
    if(cls->flags & H5FS_CLS_GHOST_OBJ) {
        sinfo->bins[bin].ghost_sect_count++;
        fspace_node->ghost_count++;

        /* Check for first ghost section in node */
        if(fspace_node->ghost_count == 1)
            sinfo->ghost_size_count++;
    } /* end if */
    else {
        sinfo->bins[bin].serial_sect_count++;
        fspace_node->serial_count++;

        /* Check for first serializable section in node */
        if(fspace_node->serial_count == 1)
            sinfo->serial_size_count++;
    } /* end else */

    /* Insert free space node into correct skip list */
    if(H5SL_insert(fspace_node->sect_list, sect, &sect->addr) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't insert free space node into skip list")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_link_size() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_link_rest
 *
 * Purpose:	Link a section into the rest of the non-size tracking
 *              free space manager data structures
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_link_rest(H5FS_t *fspace, const H5FS_section_class_t *cls,
    H5FS_section_info_t *sect, unsigned flags)
{
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_link_rest)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->sinfo);
    HDassert(sect);

    /* Add section to the address-ordered list of sections, if allowed */
    if(!(cls->flags & H5FS_CLS_SEPAR_OBJ)) {
#ifdef QAK
HDfprintf(stderr, "%s: inserting object into merge list, sect->type = %u\n", FUNC, (unsigned)sect->type);
#endif /* QAK */
        if(fspace->sinfo->merge_list == NULL)
            if(NULL == (fspace->sinfo->merge_list = H5SL_create(H5SL_TYPE_HADDR)))
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTCREATE, FAIL, "can't create skip list for merging free space sections")
        if(H5SL_insert(fspace->sinfo->merge_list, sect, &sect->addr) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't insert free space node into merging skip list")
    } /* end if */

    /* Update section info & check if we need more room for the serialized free space sections */
    if(H5FS_sect_increase(fspace, cls, flags) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't increase free space section size on disk")

    /* Increment amount of free space managed */
    fspace->tot_space += sect->size;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_link_rest() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_link
 *
 * Purpose:	Link a section into the internal data structures
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_link(H5FS_t *fspace, H5FS_section_info_t *sect, unsigned flags)
{
    const H5FS_section_class_t *cls;    /* Class of section */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_link)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->sinfo);
    HDassert(sect);

    /* Get section's class */
    cls = &fspace->sect_cls[sect->type];

    /* Add section to size tracked data structures */
#ifdef QAK
HDfprintf(stderr, "%s: Check 1.0 - fspace->tot_space = %Hu\n", FUNC, fspace->tot_space);
#endif /* QAK */
    if(H5FS_sect_link_size(fspace->sinfo, cls, sect) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't add section to size tracking data structures")

#ifdef QAK
HDfprintf(stderr, "%s: Check 2.0 - fspace->tot_space = %Hu\n", FUNC, fspace->tot_space);
#endif /* QAK */
    /* Update rest of free space manager data structures for section addition */
    if(H5FS_sect_link_rest(fspace, cls, sect, flags) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't add section to non-size tracking data structures")
#ifdef QAK
HDfprintf(stderr, "%s: Check 3.0 - fspace->tot_space = %Hu\n", FUNC, fspace->tot_space);
#endif /* QAK */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_link() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_merge
 *
 * Purpose:	Attempt to merge a returned free space section with existing
 *              free space.
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Wednesday, May 17, 2006
 *
 * Modifications: Vailin Choi; Sept 25th 2008
 *	Changes to the "shrinking" part--
 *	1. Get last section node in merge-list instead of "less-than"
 *	   node for further iteration
 *	2. Remove "can-be-shrunk" section from free-space instead of
 *	   "less-than" section
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_sect_merge(H5FS_t *fspace, H5FS_section_info_t **sect, void *op_data)
{
    H5FS_section_class_t *sect_cls;     /* Section's class */
    hbool_t modified;                   /* Flag to indicate merge or shrink occurred */
    hbool_t remove_sect = FALSE;       /* Whether a section should be removed before shrinking */
    htri_t status;                      /* Status value */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_merge)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(*sect);
    HDassert(H5F_addr_defined((*sect)->addr));
    HDassert((*sect)->size);

    /* Loop until no more merging */
    if(fspace->sinfo->merge_list) {
        do {
            H5SL_node_t *less_sect_node;    /* Skip list node for section less than new section */
            H5SL_node_t *greater_sect_node; /* Skip list node for section greater than new section */
            H5FS_section_info_t *tmp_sect;  /* Temporary free space section */
            H5FS_section_class_t *tmp_sect_cls;     /* Temporary section's class */
            hbool_t greater_sect_node_valid = FALSE;    /* Indicate if 'greater than' section node is valid */

            /* Reset 'modification occurred' flag */
            modified = FALSE;

            /* Look for neighboring section before new section */
            less_sect_node = H5SL_below(fspace->sinfo->merge_list, &(*sect)->addr);

            /* Check for node before new node able to merge with new node */
            if(less_sect_node) {
                /* Check for node greater than section */
                greater_sect_node = H5SL_next(less_sect_node);
                greater_sect_node_valid = TRUE;

                /* Get section for 'less than' skip list node */
                tmp_sect = (H5FS_section_info_t *)H5SL_item(less_sect_node);

                /* Get classes for right & left sections */
                tmp_sect_cls = &fspace->sect_cls[tmp_sect->type];
                sect_cls = &fspace->sect_cls[(*sect)->type];

                /* Check if sections of the left most class can merge with sections
                 *  of another class & whether the sections are the same type,
                 *  then check for 'can merge' callback
                 */
                if((!(tmp_sect_cls->flags & H5FS_CLS_MERGE_SYM) || (tmp_sect->type == (*sect)->type))
                        && tmp_sect_cls->can_merge) {
                    /* Determine if the sections can merge */
                    if((status = (*tmp_sect_cls->can_merge)(tmp_sect, *sect, op_data)) < 0)
                        HGOTO_ERROR(H5E_FSPACE, H5E_CANTMERGE, FAIL, "can't check for merging sections")
                    if(status > 0) {
                        /* Sanity check */
                        HDassert(tmp_sect_cls->merge);

                        /* Remove 'less than' node from data structures */
                        if(H5FS_sect_remove_real(fspace, tmp_sect) < 0)
                            HGOTO_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't remove section from internal data structures")

                        /* Merge the two sections together */
                        if((*tmp_sect_cls->merge)(tmp_sect, *sect, op_data) < 0)
                            HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't merge two sections")

                        /* Retarget section pointer to 'less than' node that was merged into */
                        *sect = tmp_sect;

                        /* Indicate successful merge occurred */
                        modified = TRUE;
                    } /* end if */
                } /* end if */
            } /* end if */

            /* Look for section after new (or merged) section, if not already determined */
            if(!greater_sect_node_valid)
                greater_sect_node = H5SL_above(fspace->sinfo->merge_list, &(*sect)->addr);

            /* Check for node after new node able to merge with new node */
            if(greater_sect_node) {
                /* Get section for 'greater than' skip list node */
                tmp_sect = (H5FS_section_info_t *)H5SL_item(greater_sect_node);

                /* Get classes for right & left sections */
                sect_cls = &fspace->sect_cls[(*sect)->type];
                tmp_sect_cls = &fspace->sect_cls[tmp_sect->type];

                /* Check if sections of the left most class can merge with sections
                 *  of another class & whether the sections are the same type,
                 *  then check for 'can merge' callback
                 */
                if((!(sect_cls->flags & H5FS_CLS_MERGE_SYM) || ((*sect)->type == tmp_sect->type))
                        && sect_cls->can_merge) {

                    /* Determine if the sections can merge */
                    if((status = (*sect_cls->can_merge)(*sect, tmp_sect, op_data)) < 0)
                        HGOTO_ERROR(H5E_FSPACE, H5E_CANTMERGE, FAIL, "can't check for merging sections")
                    if(status > 0) {
                        /* Sanity check */
                        HDassert(sect_cls->merge);

                        /* Remove 'greater than' node from data structures */
                        if(H5FS_sect_remove_real(fspace, tmp_sect) < 0)
                            HGOTO_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't remove section from internal data structures")

                        /* Merge the two sections together */
                        if((*sect_cls->merge)(*sect, tmp_sect, op_data) < 0)
                            HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't merge two sections")

                        /* Indicate successful merge occurred */
                        modified = TRUE;
                    } /* end if */
                } /* end if */
            } /* end if */
	} while(modified);
    } /* end if */
    HDassert(*sect);
#ifdef QAK
HDfprintf(stderr, "%s: Done merging, (*sect) = {%a, %Hu, %u, %s}\n", FUNC, (*sect)->addr, (*sect)->size, (*sect)->type, ((*sect)->state == H5FS_SECT_LIVE ? "H5FS_SECT_LIVE" : "H5FS_SECT_SERIALIZED"));
#endif /* QAK */

    /* Loop until no more shrinking */
    do {
        /* Reset 'modification occurred' flag */
        modified = FALSE;

        /* Check for (possibly merged) section able to shrink the size of the container */
        sect_cls = &fspace->sect_cls[(*sect)->type];
        if(sect_cls->can_shrink) {
            if((status = (*sect_cls->can_shrink)(*sect, op_data)) < 0)
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTSHRINK, FAIL, "can't check for shrinking container")
            if(status > 0) {
#ifdef QAK
HDfprintf(stderr, "%s: Can shrink!\n", FUNC);
#endif /* QAK */

		/* Remove SECT from free-space manager */
                /* (only possible to happen on second+ pass through loop) */
		if(remove_sect) {
		    if(H5FS_sect_remove_real(fspace, *sect) < 0)
			HGOTO_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't remove section from internal data structures")
		    remove_sect = FALSE;
		} /* end if */

                /* Shrink the container */
                /* (callback can indicate that it has discarded the section by setting *sect to NULL) */
                HDassert(sect_cls->shrink);
                if((*sect_cls->shrink)(sect, op_data) < 0)
                    HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't shrink free space container")

                /* If this section was shrunk away, we may need to shrink another section */
                if(*sect == NULL) {
                    /* Check for sections on merge list */
                    if(fspace->sinfo->merge_list)  {
                        H5SL_node_t *last_node;         /* Last node in merge list */

                        /* Check for last node in the merge list */
                        if(NULL != (last_node = H5SL_last(fspace->sinfo->merge_list))) {
                            /* Get the pointer to the last section, from the last node */
                            *sect = (H5FS_section_info_t *)H5SL_item(last_node);
                            HDassert(*sect);

                            /* Indicate that this section needs to be removed if it causes a shrink */
                            remove_sect = TRUE;
                        } /* end if */
                    } /* end if */
		} /* end if */

                /* Indicate successful merge occurred */
                modified = TRUE;
            } /* end if */
        } /* end if */
    } while(modified && *sect);

    /* Check for section that was shrunk away and next section not shrinking */
    if(remove_sect && (*sect != NULL))
	*sect = NULL;

#ifdef QAK
HDfprintf(stderr, "%s: Done shrinking\n", FUNC);
if(*sect)
    HDfprintf(stderr, "%s: (*sect) = {%a, %Hu, %u, %s}\n", FUNC, (*sect)->addr, (*sect)->size, (*sect)->type, ((*sect)->state == H5FS_SECT_LIVE ? "H5FS_SECT_LIVE" : "H5FS_SECT_SERIALIZED"));
else
    HDfprintf(stderr, "%s: *sect = %p\n", FUNC, *sect);
#endif /* QAK */

done:
#ifdef QAK
HDfprintf(stderr, "%s: Leaving, ret_value = %d\n", FUNC, ret_value);
#endif /* QAK */
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_merge() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_add
 *
 * Purpose:	Add a section of free space to the free list
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, March  7, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5FS_sect_add(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace, H5FS_section_info_t *sect,
    unsigned flags, void *op_data)
{
    H5FS_section_class_t *cls;          /* Section's class */
    hbool_t sinfo_valid = FALSE;        /* Whether the section info is valid */
    hbool_t sinfo_modified = FALSE;     /* Whether the section info was modified */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI(H5FS_sect_add, FAIL)

#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: *sect = {%a, %Hu, %u, %s}\n", FUNC, sect->addr, sect->size, sect->type, (sect->state == H5FS_SECT_LIVE ? "H5FS_SECT_LIVE" : "H5FS_SECT_SERIALIZED"));
#endif /* H5FS_SINFO_DEBUG */

    /* Check arguments. */
    HDassert(fspace);
    HDassert(sect);
    HDassert(H5F_addr_defined(sect->addr));
    HDassert(sect->size);

    /* Get a pointer to the section info */
    if(H5FS_sinfo_lock(f, dxpl_id, fspace, H5AC_WRITE) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTGET, FAIL, "can't get section info")
    sinfo_valid = TRUE;

    /* Call "add" section class callback, if there is one */
    cls = &fspace->sect_cls[sect->type];
    if(cls->add) {
        if((*cls->add)(sect, &flags, op_data) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "'add' section class callback failed")
    } /* end if */

    /* Check for merging returned space with existing section node */
    if(flags & H5FS_ADD_RETURNED_SPACE) {
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Returning space\n", FUNC);
#endif /* H5FS_SINFO_DEBUG */

        /* Attempt to merge returned section with existing sections */
        if(H5FS_sect_merge(fspace, &sect, op_data) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTMERGE, FAIL, "can't merge sections")
    } /* end if */

    /* Add new (possibly merged) node to free sections data structures */
    /* (If section has been completely merged or shrunk away, 'sect' will
     *  be NULL at this point - QAK)
     */
    if(sect)
        if(H5FS_sect_link(fspace, sect, flags) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't insert free space section into skip list")

#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: fspace->tot_space = %Hu\n", FUNC, fspace->tot_space);
#endif /* H5FS_SINFO_DEBUG */
    /* Mark free space sections as changed */
    /* (if adding sections while deserializing sections, don't set the flag) */
    if(!(flags & H5FS_ADD_DESERIALIZING))
        sinfo_modified = TRUE;

done:
    /* Release the section info */
    if(sinfo_valid && H5FS_sinfo_unlock(f, dxpl_id, fspace, sinfo_modified) < 0)
        HDONE_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't release section info")

#ifdef H5FS_DEBUG_ASSERT
if(!(flags & (H5FS_ADD_DESERIALIZING | H5FS_ADD_SKIP_VALID)))
    H5FS_assert(fspace);
#endif /* H5FS_DEBUG_ASSERT */
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: Leaving, ret_value = %d\n", FUNC, ret_value);
#endif /* H5FS_SINFO_DEBUG */
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_add() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_try_extend
 *
 * Purpose:	Try to extend a block using space from a section on the free list
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, January  8, 2008
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5FS_sect_try_extend(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace, haddr_t addr,
    hsize_t size, hsize_t extra_requested)
{
    hbool_t sinfo_valid = FALSE;        /* Whether the section info is valid */
    hbool_t sinfo_modified = FALSE;     /* Whether the section info was modified */
    htri_t ret_value = FALSE;           /* Return value */

    FUNC_ENTER_NOAPI(H5FS_sect_try_extend, FAIL)

#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: addr = %a, size = %Hu, extra_requested = %hu\n", FUNC, addr, size, extra_requested);
#endif /* H5FS_SINFO_DEBUG */

    /* Check arguments. */
    HDassert(f);
    HDassert(fspace);
    HDassert(H5F_addr_defined(addr));
    HDassert(size > 0);
    HDassert(extra_requested > 0);

    /* Check for any sections on free space list */
#ifdef H5FS_SINFO_DEBUG
HDfprintf(stderr, "%s: fspace->tot_sect_count = %Hu\n", FUNC, fspace->tot_sect_count);
HDfprintf(stderr, "%s: fspace->serial_sect_count = %Hu\n", FUNC, fspace->serial_sect_count);
HDfprintf(stderr, "%s: fspace->ghost_sect_count = %Hu\n", FUNC, fspace->ghost_sect_count);
#endif /* H5FS_SINFO_DEBUG */
    if(fspace->tot_sect_count > 0) {
        H5FS_section_info_t *sect;      /* Temporary free space section */

        /* Get a pointer to the section info */
        if(H5FS_sinfo_lock(f, dxpl_id, fspace, H5AC_WRITE) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTGET, FAIL, "can't get section info")
        sinfo_valid = TRUE;


/*

Pseudo-code for algorithm:

_section_ = <Get pointer to section with address > _region.addr_>
if(_section_)
    if(_section_ adjoins _region_ && _section.size_ >= _extra_requested_)
        <remove section from data structures>
        if(_section.size_ > _extra_requested_)
            if(<can adjust _section_>)
                <adjust _section_ by _extra_requested_>
                <add adjusted section back to data structures>
            else
                <re-add UNadjusted section back to data structures>
                <error>
        <mark free space sections as changed in metadata cache>

*/
        /* Look for a section after block to extend */
        if((sect = (H5FS_section_info_t *)H5SL_greater(fspace->sinfo->merge_list, &addr))) {
            /* Check if this section adjoins the block and is large enough to
             *  fulfill extension request.
             *
             * (Note: we assume that the section is fully merged with any
             *  possible neighboring nodes and is not at the end of the file
             *  (or it would have been eliminated), etc)
             */
            if(sect->size >= extra_requested && (addr + size) == sect->addr) {
                H5FS_section_class_t *cls;          /* Section's class */

                /* Remove section from data structures */
                if(H5FS_sect_remove_real(fspace, sect) < 0)
                    HGOTO_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't remove section from internal data structures")

                /* Get class for section */
                cls = &fspace->sect_cls[sect->type];

                /* Check for the section needing to be adjusted and re-added */
                /* (Note: we should probably add a can_adjust/adjust callback
                 *      to the section class structure, but we don't need it
                 *      for the current usage, so I've deferred messing with
                 *      it. - QAK - 2008/01/08)
                 */
                if(sect->size > extra_requested) {
                    /* Sanity check (for now) */
                    HDassert(cls->flags & H5FS_CLS_ADJUST_OK);

                    /* Adjust section by amount requested */
                    sect->addr += extra_requested;
                    sect->size -= extra_requested;

                    /* Re-add adjusted section to free sections data structures */
                    if(H5FS_sect_link(fspace, sect, 0) < 0)
                        HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't insert free space section into skip list")
                } /* end if */
                else {
                    /* Sanity check */
                    HDassert(sect->size == extra_requested);

                    /* Exact match, so just free section */
                    if((*cls->free)(sect) < 0)
                        HGOTO_ERROR(H5E_FSPACE, H5E_CANTFREE, FAIL, "can't free section")
                } /* end else */

                /* Note that we modified the section info */
                sinfo_modified = TRUE;

                /* Indicate success */
                HGOTO_DONE(TRUE);
            } /* end if */
        } /* end if */
    } /* end if */

done:
    /* Release the section info */
    if(sinfo_valid && H5FS_sinfo_unlock(f, dxpl_id, fspace, sinfo_modified) < 0)
        HDONE_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't release section info")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_try_extend() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_find_node
 *
 * Purpose:	Locate a section of free space (in existing free space list
 *              bins) that is large enough to fulfill request.
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, March 20, 2006
 *
 * Modifications:
 *	Vailin Choi, July 29th, 2008
 *	  Modified to handle alignment by going through each bin to find
 *	  a section that is big enough to fulfill "request+fragment for alignment"
 *
 *-------------------------------------------------------------------------
 */
static htri_t
H5FS_sect_find_node(H5FS_t *fspace, hsize_t request, H5FS_section_info_t **node)
{
    H5FS_node_t *fspace_node;        /* Free list size node */
    unsigned bin;                   /* Bin to put the free space section in */
    htri_t ret_value = FALSE;       /* Return value */

    H5SL_node_t *curr_size_node=NULL;
    const H5FS_section_class_t *cls;    /* Class of section */
    hsize_t alignment;

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_find_node)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->sinfo);
    HDassert(fspace->sinfo->bins);
    HDassert(request > 0);
    HDassert(node);

    /* Determine correct bin which holds items of at least the section's size */
    bin = H5V_log2_gen(request);
    HDassert(bin < fspace->sinfo->nbins);
#ifdef QAK
HDfprintf(stderr, "%s: fspace->sinfo->nbins = %u\n", FUNC, fspace->sinfo->nbins);
HDfprintf(stderr, "%s: bin = %u\n", FUNC, bin);
#endif /* QAK */
    alignment = fspace->alignment;
    if(!((alignment > 1) && (request >= fspace->threshold)))
	alignment = 0; /* no alignment */

    do {
        /* Check if there's any sections in this bin */
	if(fspace->sinfo->bins[bin].bin_list) {

	    if (!alignment) { /* no alignment */
		/* Find the first free space section that is large enough to fulfill request */
		/* (Since the bins use skip lists to track the sizes of the address-ordered
		 *  lists, this is actually a "best fit" algorithm)
		 */
		/* Look for large enough free space section in this bin */
		if((fspace_node = (H5FS_node_t *)H5SL_greater(fspace->sinfo->bins[bin].bin_list, &request))) {
		    /* Take first node off of the list (ie. node w/lowest address) */
		    if(NULL == (*node = (H5FS_section_info_t *)H5SL_remove_first(fspace_node->sect_list)))
			HGOTO_ERROR(H5E_FSPACE, H5E_CANTREMOVE, FAIL, "can't remove free space node from skip list")

		    /* Get section's class */
		    cls = &fspace->sect_cls[(*node)->type];
		    /* Decrement # of sections in section size node */
		    if(H5FS_size_node_decr(fspace->sinfo, bin, fspace_node, cls) < 0)
			HGOTO_ERROR(H5E_FSPACE, H5E_CANTREMOVE, FAIL, "can't remove free space size node from skip list")
		    if(H5FS_sect_unlink_rest(fspace, cls, *node) < 0)
			HGOTO_ERROR(H5E_FSPACE, H5E_CANTFREE, FAIL, "can't remove section from non-size tracking data structures")
		    /* Indicate that we found a node for the request */
		    HGOTO_DONE(TRUE)
		} /* end if */
	    }  /* end if */
            else { /* alignment is set */
                /* get the first node of a certain size in this bin */
                curr_size_node = H5SL_first(fspace->sinfo->bins[bin].bin_list);
                while (curr_size_node != NULL) {
                    H5FS_node_t *curr_fspace_node=NULL;
                    H5SL_node_t *curr_sect_node=NULL;

                    /* Get the free space node for free space sections of the same size */
                    curr_fspace_node = (H5FS_node_t *)H5SL_item(curr_size_node);

                    /* Get the Skip list which holds  pointers to actual free list sections */
                    curr_sect_node = (H5SL_node_t *)H5SL_first(curr_fspace_node->sect_list);

                    while(curr_sect_node != NULL) {
                        H5FS_section_info_t *curr_sect=NULL;
                        hsize_t mis_align=0, frag_size=0;
                        H5FS_section_info_t *split_sect=NULL;

                        /* Get section node */
                        curr_sect = (H5FS_section_info_t *)H5SL_item(curr_sect_node);

                        HDassert(H5F_addr_defined(curr_sect->addr));
                        HDassert(curr_fspace_node->sect_size == curr_sect->size);

                        cls = &fspace->sect_cls[curr_sect->type];

                        HDassert(alignment);
                        HDassert(cls);

                        if ((mis_align = curr_sect->addr % alignment))
                            frag_size = alignment - mis_align;

                        if ((curr_sect->size >= (request + frag_size)) && (cls->split)) {
                            /* remove the section with aligned address */
                            if(NULL == (*node = (H5FS_section_info_t *)H5SL_remove(curr_fspace_node->sect_list, &curr_sect->addr)))
                                HGOTO_ERROR(H5E_FSPACE, H5E_CANTREMOVE, FAIL, "can't remove free space node from skip list")
                            /* Decrement # of sections in section size node */
                            if(H5FS_size_node_decr(fspace->sinfo, bin, curr_fspace_node, cls) < 0)
                                HGOTO_ERROR(H5E_FSPACE, H5E_CANTREMOVE, FAIL, "can't remove free space size node from skip list")

                            if(H5FS_sect_unlink_rest(fspace, cls, *node) < 0)
                                HGOTO_ERROR(H5E_FSPACE, H5E_CANTFREE, FAIL, "can't remove section from non-size tracking data structures")

                            /*
                             * The split() callback splits NODE into 2 sections:
                             *  split_sect is the unused fragment for aligning NODE
                             *  NODE's addr & size are updated to point to the remaining aligned section
                             * split_sect is re-added to free-space
                             */
                            if (mis_align) {
                                split_sect = cls->split(*node, frag_size);
                                if((H5FS_sect_link(fspace, split_sect, 0) < 0))
                                    HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't insert free space section into skip list")
                                /* sanity check */
                                HDassert(split_sect->addr < (*node)->addr);
                                HDassert(request <= (*node)->size);
                            }
                            /* Indicate that we found a node for the request */
                            HGOTO_DONE(TRUE)
                        }

                        /* Get the next section node in the list */
                        curr_sect_node = H5SL_next(curr_sect_node);
                    } /* end while of curr_sect_node */

                    /* Get the next size node in the bin */
                    curr_size_node = H5SL_next(curr_size_node);
                } /* end while of curr_size_node */
	    }  /* else of alignment */
	} /* if bin_list */
	/* Advance to next larger bin */
        bin++;
    } while(bin < fspace->sinfo->nbins);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_find_node() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_find
 *
 * Purpose:	Locate a section of free space (in existing free space list) that
 *              is large enough to fulfill request.
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, March  7, 2006
 *
 * Modifications:
 *	Vailin Choi, July 29th 2008
 *	  Move H5FS_sect_unlink_rest() to H5FS_sect_find_node()
 *
 *-------------------------------------------------------------------------
 */
htri_t
H5FS_sect_find(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace, hsize_t request,
    H5FS_section_info_t **node)
{
    hbool_t sinfo_valid = FALSE;        /* Whether the section info is valid */
    hbool_t sinfo_modified = FALSE;     /* Whether the section info was modified */
    htri_t ret_value = FALSE;           /* Return value */

    FUNC_ENTER_NOAPI(H5FS_sect_find, FAIL)

#ifdef QAK
HDfprintf(stderr, "%s: request = %Hu\n", FUNC, request);
#endif /* QAK */

    /* Check arguments. */
    HDassert(fspace);
    HDassert(fspace->nclasses);
    HDassert(request);
    HDassert(node);

    /* Check for any sections on free space list */
#ifdef QAK
HDfprintf(stderr, "%s: fspace->tot_sect_count = %Hu\n", FUNC, fspace->tot_sect_count);
HDfprintf(stderr, "%s: fspace->serial_sect_count = %Hu\n", FUNC, fspace->serial_sect_count);
HDfprintf(stderr, "%s: fspace->ghost_sect_count = %Hu\n", FUNC, fspace->ghost_sect_count);
#endif /* QAK */
    if(fspace->tot_sect_count > 0) {
        /* Get a pointer to the section info */
        if(H5FS_sinfo_lock(f, dxpl_id, fspace, H5AC_WRITE) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTGET, FAIL, "can't get section info")
        sinfo_valid = TRUE;

        /* Look for node in bins */
        if((ret_value = H5FS_sect_find_node(fspace, request, node)) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTFREE, FAIL, "can't remove section from bins")

        /* Decrement # of sections on free list, if we found an object */
        if(ret_value > 0) {
            /* Note that we've modified the section info */
            sinfo_modified = TRUE;
#ifdef QAK
HDfprintf(stderr, "%s: (*node)->size = %Hu, (*node)->addr = %a, (*node)->type = %u\n", FUNC, (*node)->size, (*node)->addr, (*node)->type);
#endif /* QAK */
	}
    } /* end if */

done:
    /* Release the section info */
    if(sinfo_valid && H5FS_sinfo_unlock(f, dxpl_id, fspace, sinfo_modified) < 0)
        HDONE_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't release section info")

#ifdef H5FS_DEBUG_ASSERT
    H5FS_assert(fspace);
#endif /* H5FS_DEBUG_ASSERT */
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_find() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_iterate_sect_cb
 *
 * Purpose:	Skip list iterator callback to iterate over free space sections
 *              of a particular size
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Saturday, May 13, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_iterate_sect_cb(void *_item, void UNUSED *key, void *_udata)
{
    H5FS_section_info_t *sect_info = (H5FS_section_info_t *)_item;   /* Free space section to work on */
    H5FS_iter_ud_t *udata = (H5FS_iter_ud_t *)_udata; /* Callback info */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_iterate_sect_cb)

    /* Check arguments. */
    HDassert(sect_info);
    HDassert(udata->fspace);
    HDassert(udata->op);

    /* Make callback for this section */
    if((*udata->op)(sect_info, udata->op_data) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_BADITER, FAIL, "iteration callback failed")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_iterate_sect_cb() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_iterate_node_cb
 *
 * Purpose:	Skip list iterator callback to iterate over free space sections
 *              in a bin
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Saturday, May 13, 2006
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FS_iterate_node_cb(void *_item, void UNUSED *key, void *_udata)
{
    H5FS_node_t *fspace_node = (H5FS_node_t *)_item;   /* Free space size node to work on */
    H5FS_iter_ud_t *udata = (H5FS_iter_ud_t *)_udata; /* Callback info */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_iterate_node_cb)

    /* Check arguments. */
    HDassert(fspace_node);
    HDassert(udata->fspace);
    HDassert(udata->op);

    /* Iterate through all the sections of this size */
    HDassert(fspace_node->sect_list);
    if(H5SL_iterate(fspace_node->sect_list, H5FS_iterate_sect_cb, udata) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_BADITER, FAIL, "can't iterate over section nodes")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_iterate_node_cb() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_iterate
 *
 * Purpose:	Iterate over all the sections managed
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Saturday, May 13, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5FS_sect_iterate(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace, H5FS_operator_t op, void *op_data)
{
    H5FS_iter_ud_t udata;               /* User data for callbacks */
    hbool_t sinfo_valid = FALSE;        /* Whether the section info is valid */
    herr_t ret_value = SUCCEED;         /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_iterate)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(op);

#ifdef QAK
HDfprintf(stderr, "%s: fspace->tot_sect_count = %Hu\n", FUNC, fspace->tot_sect_count);
#endif /* QAK */

    /* Set up user data for iterator */
    udata.fspace = fspace;
    udata.op = op;
    udata.op_data = op_data;

    /* Iterate over sections, if there are any */
    if(fspace->tot_sect_count) {
        unsigned bin;           /* Current bin we are on */

        /* Get a pointer to the section info */
        if(H5FS_sinfo_lock(f, dxpl_id, fspace, H5AC_READ) < 0)
            HGOTO_ERROR(H5E_FSPACE, H5E_CANTGET, FAIL, "can't get section info")
        sinfo_valid = TRUE;

        /* Iterate over all the bins */
#ifdef QAK
HDfprintf(stderr, "%s: Iterate over section bins\n", FUNC);
#endif /* QAK */
        for(bin = 0; bin < fspace->sinfo->nbins; bin++) {
            /* Check if there are any sections in this bin */
            if(fspace->sinfo->bins[bin].bin_list) {
                /* Iterate over list of section size nodes for bin */
                if(H5SL_iterate(fspace->sinfo->bins[bin].bin_list, H5FS_iterate_node_cb, &udata) < 0)
                    HGOTO_ERROR(H5E_FSPACE, H5E_BADITER, FAIL, "can't iterate over section size nodes")
            } /* end if */
        } /* end for */
    } /* end if */

done:
    /* Release the section info */
    if(sinfo_valid && H5FS_sinfo_unlock(f, dxpl_id, fspace, FALSE) < 0)
        HDONE_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't release section info")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_iterate() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_stats
 *
 * Purpose:	Retrieve info about the sections managed
 *
 * Return:	Success:	non-negative
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Tuesday, May 30, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5FS_sect_stats(const H5FS_t *fspace, hsize_t *tot_space, hsize_t *nsects)
{
    FUNC_ENTER_NOAPI_NOFUNC(H5FS_sect_stats)

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

    /* Get the stats desired */
    if(tot_space)
        *tot_space = fspace->tot_space;
    if(nsects)
        *nsects = fspace->tot_sect_count;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* H5FS_sect_stats() */


/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_change_class
 *
 * Purpose:	Make appropriate adjustments to internal data structures when
 *              a section changes class
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Monday, July 10, 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5FS_sect_change_class(H5F_t *f, hid_t dxpl_id, H5FS_t *fspace,
    H5FS_section_info_t *sect, unsigned new_class)
{
    const H5FS_section_class_t *old_cls;        /* Old class of section */
    const H5FS_section_class_t *new_cls;        /* New class of section */
    unsigned old_class;                         /* Old class ID of section */
    hbool_t sinfo_valid = FALSE;                /* Whether the section info is valid */
    herr_t ret_value = SUCCEED;                 /* Return value */

    FUNC_ENTER_NOAPI_NOINIT(H5FS_sect_change_class)

    /* Check arguments. */
    HDassert(fspace);
    HDassert(sect);
    HDassert(sect->type < fspace->nclasses);
    HDassert(new_class < fspace->nclasses);

    /* Get a pointer to the section info */
    if(H5FS_sinfo_lock(f, dxpl_id, fspace, H5AC_WRITE) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTGET, FAIL, "can't get section info")
    sinfo_valid = TRUE;

    /* Get class info */
    old_class = sect->type;
    old_cls = &fspace->sect_cls[sect->type];
    new_cls = &fspace->sect_cls[new_class];
#ifdef QAK
HDfprintf(stderr, "%s: old_cls->flags = %x\n", FUNC, old_cls->flags);
HDfprintf(stderr, "%s: new_cls->flags = %x\n", FUNC, new_cls->flags);
#endif /* QAK */

    /* Check if the section's class change will affect the # of serializable or ghost sections */
    if((old_cls->flags & H5FS_CLS_GHOST_OBJ) != (new_cls->flags & H5FS_CLS_GHOST_OBJ)) {
        H5FS_node_t *fspace_node;       /* Free list size node */
        unsigned bin;                   /* Bin to put the free space section in */
        hbool_t to_ghost;       /* Flag if the section is changing to a ghost section */

        /* Determine if this section is becoming a ghost or is becoming serializable */
        if(old_cls->flags & H5FS_CLS_GHOST_OBJ)
            to_ghost = FALSE;
        else
            to_ghost = TRUE;
#ifdef QAK
HDfprintf(stderr, "%s: to_ghost = %u\n", FUNC, to_ghost);
#endif /* QAK */

        /* Sanity check */
        HDassert(fspace->sinfo->bins);

        /* Determine correct bin which holds items of at least the section's size */
        bin = H5V_log2_gen(sect->size);
        HDassert(bin < fspace->sinfo->nbins);
        HDassert(fspace->sinfo->bins[bin].bin_list);

        /* Get space node for section's size */
        fspace_node = (H5FS_node_t *)H5SL_search(fspace->sinfo->bins[bin].bin_list, &sect->size);
        HDassert(fspace_node);

        /* Adjust serializable/ghost counts */
        if(to_ghost) {
            /* Adjust global section count totals */
            fspace->serial_sect_count--;
            fspace->ghost_sect_count++;

            /* Adjust bin's section count totals */
            fspace->sinfo->bins[bin].serial_sect_count--;
            fspace->sinfo->bins[bin].ghost_sect_count++;

            /* Adjust section size node's section count totals */
            fspace_node->serial_count--;
            fspace_node->ghost_count++;

            /* Check if we switched a section size node's status */
            if(fspace_node->serial_count == 0)
                fspace->sinfo->serial_size_count--;
            if(fspace_node->ghost_count == 1)
                fspace->sinfo->ghost_size_count++;
        } /* end if */
        else {
            /* Adjust global section count totals */
            fspace->serial_sect_count++;
            fspace->ghost_sect_count--;

            /* Adjust bin's section count totals */
            fspace->sinfo->bins[bin].serial_sect_count++;
            fspace->sinfo->bins[bin].ghost_sect_count--;

            /* Adjust section size node's section count totals */
            fspace_node->serial_count++;
            fspace_node->ghost_count--;

            /* Check if we switched a section size node's status */
            if(fspace_node->serial_count == 1)
                fspace->sinfo->serial_size_count++;
            if(fspace_node->ghost_count == 0)
                fspace->sinfo->ghost_size_count--;
        } /* end else */
    } /* end if */

    /* Check if the section's class change will affect the mergable list */
    if((old_cls->flags & H5FS_CLS_SEPAR_OBJ) != (new_cls->flags & H5FS_CLS_SEPAR_OBJ)) {
        hbool_t to_mergable;       /* Flag if the section is changing to a mergable section */

        /* Determine if this section is becoming mergable or is becoming separate */
        if(old_cls->flags & H5FS_CLS_SEPAR_OBJ)
            to_mergable = TRUE;
        else
            to_mergable = FALSE;
#ifdef QAK
HDfprintf(stderr, "%s: to_mergable = %u\n", FUNC, to_mergable);
#endif /* QAK */

        /* Add or remove section from merge list, as appropriate */
        if(to_mergable) {
#ifdef QAK
HDfprintf(stderr, "%s: inserting object into merge list, sect->type = %u\n", FUNC, (unsigned)sect->type);
#endif /* QAK */
            if(fspace->sinfo->merge_list == NULL)
                if(NULL == (fspace->sinfo->merge_list = H5SL_create(H5SL_TYPE_HADDR)))
                    HGOTO_ERROR(H5E_FSPACE, H5E_CANTCREATE, FAIL, "can't create skip list for merging free space sections")
            if(H5SL_insert(fspace->sinfo->merge_list, sect, &sect->addr) < 0)
                HGOTO_ERROR(H5E_FSPACE, H5E_CANTINSERT, FAIL, "can't insert free space node into merging skip list")
        } /* end if */
        else {
            H5FS_section_info_t *tmp_sect_node; /* Temporary section node */

#ifdef QAK
HDfprintf(stderr, "%s: removing object from merge list, sect->type = %u\n", FUNC, (unsigned)sect->type);
#endif /* QAK */
            tmp_sect_node = (H5FS_section_info_t *)H5SL_remove(fspace->sinfo->merge_list, &sect->addr);
            if(tmp_sect_node == NULL || tmp_sect_node != sect)
                HGOTO_ERROR(H5E_FSPACE, H5E_NOTFOUND, FAIL, "can't find section node on size list")
        } /* end else */
    } /* end if */

    /* Change the section's class */
    sect->type = new_class;

    /* Change the serialized size of sections */
    fspace->sinfo->serial_size -= fspace->sect_cls[old_class].serial_size;
    fspace->sinfo->serial_size += fspace->sect_cls[new_class].serial_size;

    /* Update current space used for free space sections */
    if(H5FS_sect_serialize_size(fspace) < 0)
        HGOTO_ERROR(H5E_FSPACE, H5E_CANTCOMPUTE, FAIL, "can't adjust free space section size on disk")

done:
    /* Release the section info */
    if(sinfo_valid && H5FS_sinfo_unlock(f, dxpl_id, fspace, TRUE) < 0)
        HDONE_ERROR(H5E_FSPACE, H5E_CANTRELEASE, FAIL, "can't release section info")

    FUNC_LEAVE_NOAPI(ret_value)
} /* H5FS_sect_change_class() */

#ifdef H5FS_DEBUG_ASSERT

/*-------------------------------------------------------------------------
 * Function:	H5FS_sect_assert
 *
 * Purpose:	Verify that the sections managed are mostly sane
 *
 * Return:	Non-negative on success, negative on failure
 *
 * Programmer:	Quincey Koziol
 *		koziol@hdfgroup.org
 *		Jul 17 2006
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5FS_sect_assert(const H5FS_t *fspace)
{
    hsize_t separate_obj;       /* The number of separate objects managed */

    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5FS_sect_assert)
#ifndef QAK
HDfprintf(stderr, "%s: fspace->tot_sect_count = %Hu\n", "H5FS_sect_assert", fspace->tot_sect_count);
#endif /* QAK */

    /* Initialize state */
    separate_obj = 0;

    /* Check for bins to work on */
    if(fspace->sinfo->bins) {
        hsize_t acc_tot_sect_count;     /* Accumulated total section count from bins */
        hsize_t acc_serial_sect_count;  /* Accumulated serializable section count from bins */
        hsize_t acc_ghost_sect_count;   /* Accumulated ghost section count from bins */
        size_t acc_tot_size_count;      /* Accumulated total section size count from bins */
        size_t acc_serial_size_count;   /* Accumulated serializable section size count from bins */
        size_t acc_ghost_size_count;    /* Accumulated ghost section size count from bins */
        unsigned u;             /* Local index variable */

        /* Walk through all sections in bins */
        acc_tot_sect_count = 0;
        acc_serial_sect_count = 0;
        acc_ghost_sect_count = 0;
        acc_tot_size_count = 0;
        acc_serial_size_count = 0;
        acc_ghost_size_count = 0;
        for(u = 0; u < fspace->sinfo->nbins; u++) {
            acc_tot_sect_count += fspace->sinfo->bins[u].tot_sect_count;
            acc_serial_sect_count += fspace->sinfo->bins[u].serial_sect_count;
            acc_ghost_sect_count += fspace->sinfo->bins[u].ghost_sect_count;
            if(fspace->sinfo->bins[u].bin_list) {
                H5SL_node_t *curr_size_node;    /* Current section size node in skip list */
                size_t bin_serial_count;        /* # of serializable sections in this bin */
                size_t bin_ghost_count;         /* # of ghost sections in this bin */

                acc_tot_size_count += H5SL_count(fspace->sinfo->bins[u].bin_list);

                /* Walk through the sections in this bin */
                curr_size_node = H5SL_first(fspace->sinfo->bins[u].bin_list);
                bin_serial_count = 0;
                bin_ghost_count = 0;
                while(curr_size_node != NULL) {
                    H5FS_node_t *fspace_node;       /* Section size node */
                    H5SL_node_t *curr_sect_node;    /* Current section node in skip list */
                    size_t size_serial_count;       /* # of serializable sections of this size */
                    size_t size_ghost_count;        /* # of ghost sections of this size */

                    /* Get section size node */
                    fspace_node = H5SL_item(curr_size_node);

                    /* Check sections on list */
                    curr_sect_node = H5SL_first(fspace_node->sect_list);
                    size_serial_count = 0;
                    size_ghost_count = 0;
                    while(curr_sect_node != NULL) {
                        H5FS_section_class_t *cls;      /* Class of section */
                        H5FS_section_info_t *sect;      /* Section */

                        /* Get section node & it's class */
                        sect = H5SL_item(curr_sect_node);
                        cls = &fspace->sect_cls[sect->type];
#ifdef QAK
HDfprintf(stderr, "%s: sect->size = %Hu, sect->addr = %a, sect->type = %u\n", "H5FS_assert", sect->size, sect->addr, sect->type);
#endif /* QAK */

                        /* Sanity check section */
                        HDassert(H5F_addr_defined(sect->addr));
                        HDassert(fspace_node->sect_size == sect->size);
                        if(cls->valid)
                            (*cls->valid)(cls, sect);

                        /* Add to correct count */
                        if(cls->flags & H5FS_CLS_GHOST_OBJ)
                            size_ghost_count++;
                        else
                            size_serial_count++;

                        /* Count node, if separate */
                        if(cls->flags & H5FS_CLS_SEPAR_OBJ)
                            separate_obj++;

                        /* Get the next section node in the list */
                        curr_sect_node = H5SL_next(curr_sect_node);
                    } /* end while */

                    /* Check the number of serializable & ghost sections of this size */
                    HDassert(fspace_node->serial_count == size_serial_count);
                    HDassert(fspace_node->ghost_count == size_ghost_count);

                    /* Add to global count of serializable & ghost section sizes */
                    if(fspace_node->serial_count > 0)
                        acc_serial_size_count++;
                    if(fspace_node->ghost_count > 0)
                        acc_ghost_size_count++;

                    /* Add to bin's serializable & ghost counts */
                    bin_serial_count += size_serial_count;
                    bin_ghost_count += size_ghost_count;

                    /* Get the next section size node in the list */
                    curr_size_node = H5SL_next(curr_size_node);
                } /* end while */

                /* Check the number of serializable & ghost sections in this bin */
                HDassert(fspace->sinfo->bins[u].tot_sect_count == (bin_serial_count + bin_ghost_count));
                HDassert(fspace->sinfo->bins[u].serial_sect_count == bin_serial_count);
                HDassert(fspace->sinfo->bins[u].ghost_sect_count == bin_ghost_count);
            } /* end if */
        } /* end for */

        /* Check counts from bins vs. global counts */
        HDassert(fspace->sinfo->tot_size_count == acc_tot_size_count);
        HDassert(fspace->sinfo->serial_size_count == acc_serial_size_count);
        HDassert(fspace->sinfo->ghost_size_count == acc_ghost_size_count);
        HDassert(fspace->tot_sect_count == acc_tot_sect_count);
        HDassert(fspace->serial_sect_count == acc_serial_sect_count);
        HDassert(fspace->ghost_sect_count == acc_ghost_sect_count);
    } /* end if */
    else {
        /* Check counts are zero */
        HDassert(fspace->tot_sect_count == 0);
        HDassert(fspace->serial_sect_count == 0);
        HDassert(fspace->ghost_sect_count == 0);
    } /* end else */

    /* Make certain that the number of sections on the address list is correct */
    if(fspace->sinfo->merge_list)
        HDassert(fspace->tot_sect_count == (separate_obj + H5SL_count(fspace->sinfo->merge_list)));

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5FS_sect_assert() */
#endif /* H5FS_DEBUG_ASSERT */