summaryrefslogtreecommitdiffstats
path: root/src/H5FDlog.c
blob: d3f29491a05e3e8a375feb7e2ef5abd7bd0beef8 (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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the files COPYING and Copyright.html.  COPYING can be found at the root   *
 * of the source code distribution tree; Copyright.html can be found at the  *
 * root level of an installed copy of the electronic HDF5 document set and   *
 * is linked from the top-level documents page.  It can also be found at     *
 * http://hdf.ncsa.uiuc.edu/HDF5/doc/Copyright.html.  If you do not have     *
 * access to either file, you may request a copy from hdfhelp@ncsa.uiuc.edu. *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * Programmer:  Quincey Koziol <koziol@ncsa.uiuc.edu>
 *              Monday, April 17, 2000
 *
 * Purpose:	The POSIX unbuffered file driver using only the HDF5 public
 *		API and with a few optimizations: the lseek() call is made
 *		only when the current file position is unknown or needs to be
 *		changed based on previous I/O through this driver (don't mix
 *		I/O from this driver with I/O from other parts of the
 *		application to the same file).
 *          With custom modifications...
 */

/* Pablo information */
/* (Put before include files to avoid problems with inline functions) */
#define PABLO_MASK	H5FD_log_mask

#include "H5private.h"		/* Generic Functions			*/
#include "H5Eprivate.h"		/* Error handling		  	*/
#include "H5Fprivate.h"		/* File access				*/
#include "H5FDprivate.h"	/* File drivers				*/
#include "H5FDlog.h"		/* Logging file driver			*/
#include "H5Iprivate.h"		/* IDs			  		*/
#include "H5MMprivate.h"	/* Memory management			*/
#include "H5Pprivate.h"		/* Property lists			*/

#ifdef MAX
#undef MAX
#define MAX(X,Y)	((X)>(Y)?(X):(Y))
#endif /* MAX */

/* The driver identification number, initialized at runtime */
static hid_t H5FD_LOG_g = 0;

/* File operations */
#define OP_UNKNOWN	0
#define OP_READ		1
#define OP_WRITE	2

/* Driver-specific file access properties */
typedef struct H5FD_log_fapl_t {
    char *logfile;	        /* Allocated log file name */
    unsigned flags;             /* Flags for logging behavior */
    size_t buf_size;            /* Size of buffers for track flavor and number of times each byte is accessed */
} H5FD_log_fapl_t;

/* Define strings for the different file memory types */
static const char *flavors[]={   /* These are defined in H5FDpublic.h */
    "H5FD_MEM_DEFAULT",
    "H5FD_MEM_SUPER",
    "H5FD_MEM_BTREE",
    "H5FD_MEM_DRAW",
    "H5FD_MEM_GHEAP",
    "H5FD_MEM_LHEAP",
    "H5FD_MEM_OHDR",
};

/*
 * The description of a file belonging to this driver. The `eoa' and `eof'
 * determine the amount of hdf5 address space in use and the high-water mark
 * of the file (the current size of the underlying Unix file). The `pos'
 * value is used to eliminate file position updates when they would be a
 * no-op. Unfortunately we've found systems that use separate file position
 * indicators for reading and writing so the lseek can only be eliminated if
 * the current operation is the same as the previous operation.  When opening
 * a file the `eof' will be set to the current file size, `eoa' will be set
 * to zero, `pos' will be set to H5F_ADDR_UNDEF (as it is when an error
 * occurs), and `op' will be set to H5F_OP_UNKNOWN.
 */
typedef struct H5FD_log_t {
    H5FD_t	pub;			/*public stuff, must be first	*/
    int		fd;			/*the unix file			*/
    haddr_t	eoa;			/*end of allocated region	*/
    haddr_t	eof;			/*end of file; current file size*/
    haddr_t	pos;			/*current file I/O position	*/
    int		op;			    /*last operation		*/
    unsigned char *nread;   /* Number of reads from a file location */
    unsigned char *nwrite;  /* Number of write to a file location */
    unsigned char *flavor;  /* Flavor of information written to file location */
    size_t  iosize;         /* Size of I/O information buffers */
    FILE   *logfp;          /* Log file pointer */
    H5FD_log_fapl_t fa;	/*driver-specific file access properties*/
#ifndef WIN32
    /*
     * On most systems the combination of device and i-node number uniquely
     * identify a file.
     */
    dev_t	device;			/*file device number		*/
    ino_t	inode;			/*file i-node number		*/
#else
    /*
     * On WIN32 the low-order word of a unique identifier associated with the
     * file and the volume serial number uniquely identify a file. This number
     * (which, both? -rpm) may change when the system is restarted or when the
     * file is opened. After a process opens a file, the identifier is
     * constant until the file is closed. An application can use this
     * identifier and the volume serial number to determine whether two
     * handles refer to the same file.
     */
    DWORD fileindexlo;
    DWORD fileindexhi;
#endif
} H5FD_log_t;


/*
 * This driver supports systems that have the lseek64() function by defining
 * some macros here so we don't have to have conditional compilations later
 * throughout the code.
 *
 * file_offset_t:	The datatype for file offsets, the second argument of
 *			the lseek() or lseek64() call.
 *
 * file_seek:		The function which adjusts the current file position,
 *			either lseek() or lseek64().
 */
/* adding for windows NT file system support. */

#ifdef H5_HAVE_LSEEK64
#   define file_offset_t	off64_t
#   define file_seek		lseek64
#elif defined (WIN32)
#   ifdef __MWERKS__
#       define file_offset_t off_t
#       define file_seek lseek
#   else /*MSVC*/
#       define file_offset_t __int64
#       define file_seek _lseeki64
#   endif
#else
#   define file_offset_t	off_t
#   define file_seek		lseek
#endif


/*
 * These macros check for overflow of various quantities.  These macros
 * assume that file_offset_t is signed and haddr_t and size_t are unsigned.
 * 
 * ADDR_OVERFLOW:	Checks whether a file address of type `haddr_t'
 *			is too large to be represented by the second argument
 *			of the file seek function.
 *
 * SIZE_OVERFLOW:	Checks whether a buffer size of type `hsize_t' is too
 *			large to be represented by the `size_t' type.
 *
 * REGION_OVERFLOW:	Checks whether an address and size pair describe data
 *			which can be addressed entirely by the second
 *			argument of the file seek function.
 */
#define MAXADDR (((haddr_t)1<<(8*sizeof(file_offset_t)-1))-1)
#define ADDR_OVERFLOW(A)	(HADDR_UNDEF==(A) ||			      \
				 ((A) & ~(haddr_t)MAXADDR))
#define SIZE_OVERFLOW(Z)	((Z) & ~(hsize_t)MAXADDR)
#define REGION_OVERFLOW(A,Z)	(ADDR_OVERFLOW(A) || SIZE_OVERFLOW(Z) ||      \
				 sizeof(file_offset_t)<sizeof(size_t) ||      \
                                 HADDR_UNDEF==(A)+(Z) ||		      \
				 (file_offset_t)((A)+(Z))<(file_offset_t)(A))

/* Prototypes */
static void *H5FD_log_fapl_get(H5FD_t *file);
static void *H5FD_log_fapl_copy(const void *_old_fa);
static herr_t H5FD_log_fapl_free(void *_fa);
static H5FD_t *H5FD_log_open(const char *name, unsigned flags, hid_t fapl_id,
			      haddr_t maxaddr);
static herr_t H5FD_log_close(H5FD_t *_file);
static int H5FD_log_cmp(const H5FD_t *_f1, const H5FD_t *_f2);
static herr_t H5FD_log_query(const H5FD_t *_f1, unsigned long *flags);
static haddr_t H5FD_log_alloc(H5FD_t *_file, H5FD_mem_t type, hid_t dxpl_id, hsize_t size);
static haddr_t H5FD_log_get_eoa(H5FD_t *_file);
static herr_t H5FD_log_set_eoa(H5FD_t *_file, haddr_t addr);
static haddr_t H5FD_log_get_eof(H5FD_t *_file);
static herr_t  H5FD_log_get_handle(H5FD_t *_file, hid_t fapl, void** file_handle);
static herr_t H5FD_log_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
			     size_t size, void *buf);
static herr_t H5FD_log_write(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr,
			      size_t size, const void *buf);
static herr_t H5FD_log_flush(H5FD_t *_file, hid_t dxpl_id, unsigned closing);

/*
 * The free list map which causes each request type to use no free lists
 */
#define H5FD_FLMAP_NOLIST {						      \
    H5FD_MEM_NOLIST,			/*default*/			      \
    H5FD_MEM_NOLIST,			/*super*/			      \
    H5FD_MEM_NOLIST,			/*btree*/			      \
    H5FD_MEM_NOLIST,			/*draw*/			      \
    H5FD_MEM_NOLIST,			/*gheap*/			      \
    H5FD_MEM_NOLIST,			/*lheap*/			      \
    H5FD_MEM_NOLIST			/*ohdr*/			      \
}

static const H5FD_class_t H5FD_log_g = {
    "log",					/*name			*/
    MAXADDR,					/*maxaddr		*/
    H5F_CLOSE_WEAK,				/* fc_degree		*/
    NULL,					/*sb_size		*/
    NULL,					/*sb_encode		*/
    NULL,					/*sb_decode		*/
    sizeof(H5FD_log_fapl_t),                    /*fapl_size		*/
    H5FD_log_fapl_get,		                /*fapl_get		*/
    H5FD_log_fapl_copy,		                /*fapl_copy		*/
    H5FD_log_fapl_free,		                /*fapl_free		*/
    0,						/*dxpl_size		*/
    NULL,					/*dxpl_copy		*/
    NULL,					/*dxpl_free		*/
    H5FD_log_open,				/*open			*/
    H5FD_log_close,				/*close			*/
    H5FD_log_cmp,				/*cmp			*/
    H5FD_log_query,				/*query			*/
    H5FD_log_alloc,				/*alloc			*/
    NULL,					/*free			*/
    H5FD_log_get_eoa,				/*get_eoa		*/
    H5FD_log_set_eoa, 				/*set_eoa		*/
    H5FD_log_get_eof,				/*get_eof		*/
    H5FD_log_get_handle,                        /*get_handle            */
    H5FD_log_read,				/*read			*/
    H5FD_log_write,				/*write			*/
    H5FD_log_flush,				/*flush			*/
    NULL,                                       /*lock                  */
    NULL,                                       /*unlock                */
    H5FD_FLMAP_NOLIST 				/*fl_map		*/
};

/* Interface initialization */
#define INTERFACE_INIT	H5FD_log_init
static int interface_initialize_g = 0;


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_init
 *
 * Purpose:	Initialize this driver by registering the driver with the
 *		library.
 *
 * Return:	Success:	The driver ID for the log driver.
 *
 *		Failure:	Negative.
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5FD_log_init(void)
{
    hid_t ret_value;         /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_init, FAIL)

    if (H5I_VFL!=H5Iget_type(H5FD_LOG_g))
        H5FD_LOG_g = H5FD_register(&H5FD_log_g,sizeof(H5FD_class_t));

    /* Set return value */
    ret_value=H5FD_LOG_g;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*---------------------------------------------------------------------------
 * Function:	H5FD_log_term
 *
 * Purpose:	Shut down the VFD
 *
 * Return:	<none>
 *
 * Programmer:  Quincey Koziol
 *              Friday, Jan 30, 2004
 *
 * Modification:
 *
 *---------------------------------------------------------------------------
 */
void
H5FD_log_term(void)
{
    FUNC_ENTER_NOAPI_NOINIT_NOFUNC(H5FD_log_term)

    /* Reset VFL ID */
    H5FD_LOG_g=0;

    FUNC_LEAVE_NOAPI_VOID
} /* end H5FD_log_term() */


/*-------------------------------------------------------------------------
 * Function:	H5Pset_fapl_log
 *
 * Purpose:	Modify the file access property list to use the H5FD_LOG
 *		driver defined in this source file.  There are no driver
 *		specific properties.
 *		
 * Return:	Non-negative on success/Negative on failure
 *
 * Programmer:	Robb Matzke
 *		Thursday, February 19, 1998
 *
 * Modifications:
 *              We copy the LOGFILE value into our own access properties.
 *
 * 		Raymond Lu, 2001-10-25
 *		Changed the file access list to the new generic property list.
 *	
 *-------------------------------------------------------------------------
 */
herr_t
H5Pset_fapl_log(hid_t fapl_id, const char *logfile, unsigned flags, size_t buf_size)
{
    H5FD_log_fapl_t	fa;     /* File access property list information */
    H5P_genplist_t *plist;      /* Property list pointer */
    herr_t ret_value;

    FUNC_ENTER_API(H5Pset_fapl_log, FAIL)
    H5TRACE4("e","isIuz",fapl_id,logfile,flags,buf_size);
    
    if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list")
       
    fa.logfile=(char*)logfile;
    fa.flags=flags;
    fa.buf_size=buf_size;
    ret_value= H5P_set_driver(plist, H5FD_LOG, &fa);

done:
    FUNC_LEAVE_API(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_fapl_get
 *
 * Purpose:	Returns a file access property list which indicates how the
 *		specified file is being accessed. The return list could be
 *		used to access another file the same way.
 *
 * Return:	Success:	Ptr to new file access property list with all
 *				members copied from the file struct.
 *
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Thursday, April 20, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void *
H5FD_log_fapl_get(H5FD_t *_file)
{
    H5FD_log_t	*file = (H5FD_log_t*)_file;
    void *ret_value;    /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_fapl_get, NULL)

    /* Set return value */
    ret_value= H5FD_log_fapl_copy(&(file->fa));

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_log_fapl_get() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_fapl_copy
 *
 * Purpose:	Copies the log-specific file access properties.
 *
 * Return:	Success:	Ptr to a new property list
 *
 *		Failure:	NULL
 *
 * Programmer:	Quincey Koziol
 *              Thursday, April 20, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static void *
H5FD_log_fapl_copy(const void *_old_fa)
{
    const H5FD_log_fapl_t *old_fa = (const H5FD_log_fapl_t*)_old_fa;
    H5FD_log_fapl_t *new_fa = H5MM_malloc(sizeof(H5FD_log_fapl_t));
    void *ret_value;    /* Return value */
    
    FUNC_ENTER_NOAPI(H5FD_log_fapl_copy, NULL)

    assert(new_fa);

    /* Copy the general information */
    HDmemcpy(new_fa, old_fa, sizeof(H5FD_log_fapl_t));

    /* Deep copy the log file name */
    if(old_fa->logfile!=NULL)
        if (NULL==(new_fa->logfile=HDstrdup(old_fa->logfile)))
            HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to allocate log file name")

    /* Set return value */
    ret_value=new_fa;

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_log_fapl_copy() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_fapl_free
 *
 * Purpose:	Frees the log-specific file access properties.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Quincey Koziol
 *              Thursday, April 20, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_fapl_free(void *_fa)
{
    H5FD_log_fapl_t	*fa = (H5FD_log_fapl_t*)_fa;
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_fapl_free, FAIL)

    /* Free the fapl information */
    if(fa->logfile)
        H5MM_xfree(fa->logfile);
    H5MM_xfree(fa);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_log_fapl_free() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_open
 *
 * Purpose:	Create and/or opens a Unix file as an HDF5 file.
 *
 * Return:	Success:	A pointer to a new file data structure. The
 *				public fields will be initialized by the
 *				caller, which is always H5FD_open().
 *
 *		Failure:	NULL
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static H5FD_t *
H5FD_log_open(const char *name, unsigned flags, hid_t fapl_id,
	       haddr_t maxaddr)
{
    int	    o_flags;
    int		fd=(-1);
    H5FD_log_t	*file=NULL;
    H5FD_log_fapl_t	*fa;     /* File access property list information */
#ifdef WIN32
    HFILE filehandle;
    struct _BY_HANDLE_FILE_INFORMATION fileinfo;
#endif
    h5_stat_t sb;
    H5P_genplist_t *plist;      /* Property list */
    H5FD_t	*ret_value;

    FUNC_ENTER_NOAPI(H5FD_log_open, NULL)

    /* Check arguments */
    if (!name || !*name)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, NULL, "invalid file name")
    if (0==maxaddr || HADDR_UNDEF==maxaddr)
        HGOTO_ERROR(H5E_ARGS, H5E_BADRANGE, NULL, "bogus maxaddr")
    if (ADDR_OVERFLOW(maxaddr))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, NULL, "bogus maxaddr")

    /* Build the open flags */
    o_flags = (H5F_ACC_RDWR & flags) ? O_RDWR : O_RDONLY;
    if (H5F_ACC_TRUNC & flags) o_flags |= O_TRUNC;
    if (H5F_ACC_CREAT & flags) o_flags |= O_CREAT;
    if (H5F_ACC_EXCL & flags) o_flags |= O_EXCL;

    /* Open the file */
    if ((fd=HDopen(name, o_flags, 0666))<0)
        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to open file")
    if (HDfstat(fd, &sb)<0)
        HGOTO_ERROR(H5E_FILE, H5E_BADFILE, NULL, "unable to fstat file")

    /* Create the new file struct */
    if (NULL==(file=H5MM_calloc(sizeof(H5FD_log_t))))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to allocate file struct")

    /* Get the driver specific information */
    if(NULL == (plist = H5P_object_verify(fapl_id,H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, NULL, "not a file access property list")
    fa = H5P_get_driver_info(plist);

    file->fd = fd;
    H5_ASSIGN_OVERFLOW(file->eof,sb.st_size,off_t,haddr_t);
    file->pos = HADDR_UNDEF;
    file->op = OP_UNKNOWN;
#ifdef WIN32
    filehandle = _get_osfhandle(fd);
    (void)GetFileInformationByHandle((HANDLE)filehandle, &fileinfo);
    file->fileindexhi = fileinfo.nFileIndexHigh;
    file->fileindexlo = fileinfo.nFileIndexLow;
#else
    file->device = sb.st_dev;
    file->inode = sb.st_ino;
#endif

    /* Get the flags for logging */
    file->fa.flags=fa->flags;

    /* Check if we are doing any logging at all */
    if(file->fa.flags!=0) {
        file->iosize=fa->buf_size;
        if(file->fa.flags&H5FD_LOG_NUM_READ) {
            file->nread=H5MM_calloc(file->iosize);
            assert(file->nread);
        } /* end if */
        if(file->fa.flags&H5FD_LOG_NUM_WRITE) {
            file->nwrite=H5MM_calloc(file->iosize);
            assert(file->nwrite);
        } /* end if */
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            file->flavor=H5MM_calloc(file->iosize);
            assert(file->flavor);
        } /* end if */
        if(fa->logfile)
            file->logfp=HDfopen(fa->logfile,"w");
        else
            file->logfp=stderr;
    } /* end if */

    /* Set return value */
    ret_value=(H5FD_t*)file;

done:
    if(ret_value==NULL) {
        if(fd>=0)
            HDclose(fd);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_log_open() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_close
 *
 * Purpose:	Closes a Unix file.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1, file not closed.
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_close(H5FD_t *_file)
{
    H5FD_log_t	*file = (H5FD_log_t*)_file;
#ifdef H5_HAVE_GETTIMEOFDAY
    struct timeval timeval_start,timeval_stop;
    struct timeval timeval_diff;
#endif /* H5_HAVE_GETTIMEOFDAY */
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_close, FAIL)

#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_CLOSE)
        HDgettimeofday(&timeval_start,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
    if (close(file->fd)<0)
        HGOTO_ERROR(H5E_IO, H5E_CANTCLOSEFILE, FAIL, "unable to close file")
#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_CLOSE)
        HDgettimeofday(&timeval_stop,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */

    /* Dump I/O information */
    if(file->fa.flags!=0) {
        haddr_t addr;
        haddr_t last_addr;
        unsigned char last_val;

#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_CLOSE) {
             /* Calculate the elapsed gettimeofday time */
             timeval_diff.tv_usec=timeval_stop.tv_usec-timeval_start.tv_usec;
             timeval_diff.tv_sec=timeval_stop.tv_sec-timeval_start.tv_sec;
             if(timeval_diff.tv_usec<0) {
                 timeval_diff.tv_usec+=1000000;
                 timeval_diff.tv_sec--;
             } /* end if */
            HDfprintf(file->logfp,"Close took: (%f s)\n",(double)timeval_diff.tv_sec+((double)timeval_diff.tv_usec/(double)1000000.0));
        } /* end if */
#endif /* H5_HAVE_GETTIMEOFDAY */

        /* Dump the write I/O information */
        if(file->fa.flags&H5FD_LOG_FILE_WRITE) {
            HDfprintf(file->logfp,"Dumping write I/O information:\n");
            last_val=file->nwrite[0];
            last_addr=0;
            addr=1;
            while(addr<file->eoa) {
                if(file->nwrite[addr]!=last_val) {
                    HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) written to %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
                    last_val=file->nwrite[addr];
                    last_addr=addr;
                } /* end if */
                addr++;
            } /* end while */
            HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) written to %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
        } /* end if */

        /* Dump the read I/O information */
        if(file->fa.flags&H5FD_LOG_FILE_READ) {
            HDfprintf(file->logfp,"Dumping read I/O information:\n");
            last_val=file->nread[0];
            last_addr=0;
            addr=1;
            while(addr<file->eoa) {
                if(file->nread[addr]!=last_val) {
                    HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) read from %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
                    last_val=file->nread[addr];
                    last_addr=addr;
                } /* end if */
                addr++;
            } /* end while */
            HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) read from %3d times\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),(int)last_val);
        } /* end if */

        /* Dump the I/O flavor information */
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            HDfprintf(file->logfp,"Dumping I/O flavor information:\n");
            last_val=file->flavor[0];
            last_addr=0;
            addr=1;
            while(addr<file->eoa) {
                if(file->flavor[addr]!=last_val) {
                    HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) flavor is %s\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),flavors[last_val]);
                    last_val=file->flavor[addr];
                    last_addr=addr;
                } /* end if */
                addr++;
            } /* end while */
            HDfprintf(file->logfp,"\tAddr %10a-%10a (%10lu bytes) flavor is %s\n",last_addr,(addr-1),(unsigned long)(addr-last_addr),flavors[last_val]);
        } /* end if */

        /* Free the logging information */
        if(file->fa.flags&H5FD_LOG_FILE_WRITE)
            file->nwrite=H5MM_xfree(file->nwrite);
        if(file->fa.flags&H5FD_LOG_FILE_READ)
            file->nread=H5MM_xfree(file->nread);
        if(file->fa.flags&H5FD_LOG_FLAVOR)
            file->flavor=H5MM_xfree(file->flavor);
        if(file->logfp!=stderr)
            fclose(file->logfp);
    } /* end if */

    H5MM_xfree(file);

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_cmp
 *
 * Purpose:	Compares two files belonging to this driver using an
 *		arbitrary (but consistent) ordering.
 *
 * Return:	Success:	A value like strcmp()
 *
 *		Failure:	never fails (arguments were checked by the
 *				caller).
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static int
H5FD_log_cmp(const H5FD_t *_f1, const H5FD_t *_f2)
{
    const H5FD_log_t	*f1 = (const H5FD_log_t*)_f1;
    const H5FD_log_t	*f2 = (const H5FD_log_t*)_f2;
    int ret_value=0;

    FUNC_ENTER_NOAPI(H5FD_log_cmp, H5FD_VFD_DEFAULT)

#ifdef WIN32
    if (f1->fileindexhi < f2->fileindexhi) HGOTO_DONE(-1)
    if (f1->fileindexhi > f2->fileindexhi) HGOTO_DONE(1)

    if (f1->fileindexlo < f2->fileindexlo) HGOTO_DONE(-1)
    if (f1->fileindexlo > f2->fileindexlo) HGOTO_DONE(1)

#else
#ifdef H5_DEV_T_IS_SCALAR
    if (f1->device < f2->device) HGOTO_DONE(-1)
    if (f1->device > f2->device) HGOTO_DONE(1)
#else /* H5_DEV_T_IS_SCALAR */
    /* If dev_t isn't a scalar value on this system, just use memcmp to
     * determine if the values are the same or not.  The actual return value
     * shouldn't really matter...
     */
    if(HDmemcmp(&(f1->device),&(f2->device),sizeof(dev_t))<0) HGOTO_DONE(-1)
    if(HDmemcmp(&(f1->device),&(f2->device),sizeof(dev_t))>0) HGOTO_DONE(1)
#endif /* H5_DEV_T_IS_SCALAR */

    if (f1->inode < f2->inode) HGOTO_DONE(-1)
    if (f1->inode > f2->inode) HGOTO_DONE(1)
#endif

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_query
 *
 * Purpose:	Set the flags that this VFL driver is capable of supporting.
 *              (listed in H5FDpublic.h)
 *
 * Return:	Success:	non-negative
 *
 *		Failure:	negative
 *
 * Programmer:	Quincey Koziol
 *              Friday, August 25, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5FD_log_query(const H5FD_t UNUSED * _f, unsigned long *flags /* out */)
{
    herr_t ret_value=SUCCEED;

    FUNC_ENTER_NOAPI(H5FD_log_query, FAIL)

    /* Set the VFL feature flags that this driver supports */
    if(flags) {
        *flags = 0;
        *flags|=H5FD_FEAT_AGGREGATE_METADATA; /* OK to aggregate metadata allocations */
        *flags|=H5FD_FEAT_ACCUMULATE_METADATA; /* OK to accumulate metadata for faster writes */
        *flags|=H5FD_FEAT_DATA_SIEVE;       /* OK to perform data sieving for faster raw data reads & writes */
        *flags|=H5FD_FEAT_AGGREGATE_SMALLDATA; /* OK to aggregate "small" raw data allocations */
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_alloc
 *
 * Purpose:	Allocate file memory.
 *
 * Return:	Success:	Address of new memory
 *
 *		Failure:	HADDR_UNDEF
 *
 * Programmer:	Quincey Koziol
 *              Monday, April 17, 2000
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static haddr_t
H5FD_log_alloc(H5FD_t *_file, H5FD_mem_t type, hid_t UNUSED dxpl_id, hsize_t size)
{
    H5FD_log_t	*file = (H5FD_log_t*)_file;
    haddr_t		addr;
    haddr_t ret_value;          /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_alloc, HADDR_UNDEF)

    /* Compute the address for the block to allocate */
    addr = file->eoa;

    /* Check if we need to align this block */
    if(size>=file->pub.threshold) {
        /* Check for an already aligned block */
        if(addr%file->pub.alignment!=0)
            addr=((addr/file->pub.alignment)+1)*file->pub.alignment;
    } /* end if */

    file->eoa = addr+size;

    /* Retain the (first) flavor of the information written to the file */
    if(file->fa.flags!=0) {
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            assert(addr<file->iosize);
            H5_CHECK_OVERFLOW(size,hsize_t,size_t);
            HDmemset(&file->flavor[addr],type,(size_t)size);
        } /* end if */

        if(file->fa.flags&H5FD_LOG_ALLOC)
            HDfprintf(file->logfp,"%10a-%10a (%10Hu bytes) Allocated, flavor=%s\n",addr,addr+size-1,size,flavors[type]);
    } /* end if */

    /* Set return value */
    ret_value=addr;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}   /* H5FD_log_alloc() */


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_get_eoa
 *
 * Purpose:	Gets the end-of-address marker for the file. The EOA marker
 *		is the first address past the last byte allocated in the
 *		format address space.
 *
 * Return:	Success:	The end-of-address marker.
 *
 *		Failure:	HADDR_UNDEF
 *
 * Programmer:	Robb Matzke
 *              Monday, August  2, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD_log_get_eoa(H5FD_t *_file)
{
    H5FD_log_t	*file = (H5FD_log_t*)_file;
    haddr_t ret_value;          /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_get_eoa, HADDR_UNDEF)

    /* Set return value */
    ret_value=file->eoa;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_set_eoa
 *
 * Purpose:	Set the end-of-address marker for the file. This function is
 *		called shortly after an existing HDF5 file is opened in order
 *		to tell the driver where the end of the HDF5 data is located.
 *
 * Return:	Success:	0
 *
 *		Failure:	-1
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD_log_set_eoa(H5FD_t *_file, haddr_t addr)
{
    H5FD_log_t	*file = (H5FD_log_t*)_file;
    herr_t ret_value=SUCCEED;   /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_set_eoa, FAIL)

    file->eoa = addr;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_get_eof
 *
 * Purpose:	Returns the end-of-file marker, which is the greater of
 *		either the Unix end-of-file or the HDF5 end-of-address
 *		markers.
 *
 * Return:	Success:	End of file address, the first address past
 *				the end of the "file", either the Unix file
 *				or the HDF5 file.
 *
 *		Failure:	HADDR_UNDEF
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD_log_get_eof(H5FD_t *_file)
{
    H5FD_log_t	*file = (H5FD_log_t*)_file;
    haddr_t ret_value;          /* Return value */

    FUNC_ENTER_NOAPI(H5FD_get_get_eof, HADDR_UNDEF)

    /* Set return value */
    ret_value=MAX(file->eof, file->eoa);

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:       H5FD_log_get_handle
 * 
 * Purpose:        Returns the file handle of LOG file driver.
 * 
 * Returns:        Non-negative if succeed or negative if fails.
 * 
 * Programmer:     Raymond Lu
 *                 Sept. 16, 2002
 *                 
 * Modifications:  
 * 
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5FD_log_get_handle(H5FD_t *_file, hid_t UNUSED fapl, void** file_handle)
{   
    H5FD_log_t          *file = (H5FD_log_t *)_file;
    herr_t              ret_value = SUCCEED;
                                                   
    FUNC_ENTER_NOAPI(H5FD_log_get_handle, FAIL)

    if(!file_handle)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "file handle not valid")

    *file_handle = &(file->fd);
                                                                                                                                     
done:   
    FUNC_LEAVE_NOAPI(ret_value)
}   
            

/*-------------------------------------------------------------------------
 * Function:	H5FD_log_read
 *
 * Purpose:	Reads SIZE bytes of data from FILE beginning at address ADDR
 *		into buffer BUF according to data transfer properties in
 *		DXPL_ID.
 *
 * Return:	Success:	Zero. Result is stored in caller-supplied
 *				buffer BUF.
 *
 *		Failure:	-1, Contents of buffer BUF are undefined.
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5FD_log_read(H5FD_t *_file, H5FD_mem_t UNUSED type, hid_t UNUSED dxpl_id, haddr_t addr,
	       size_t size, void *buf/*out*/)
{
    H5FD_log_t		*file = (H5FD_log_t*)_file;
    ssize_t		nbytes;
    herr_t      ret_value=SUCCEED;       /* Return value */
    
    FUNC_ENTER_NOAPI(H5FD_log_read, FAIL)

    assert(file && file->pub.cls);
    assert(buf);

    /* Check for overflow conditions */
    if (HADDR_UNDEF==addr)
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined")
    if (REGION_OVERFLOW(addr, size))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow")
    if (addr+size>file->eoa)
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow")

    /* Log the I/O information about the read */
    if(file->fa.flags!=0) {
        size_t tmp_size=size;
        haddr_t tmp_addr=addr;

        /* Log information about the number of times these locations are read */
        if(file->fa.flags&H5FD_LOG_FILE_READ) {
            assert((addr+size)<file->iosize);
            while(tmp_size-->0)
                file->nread[tmp_addr++]++;
        } /* end if */

        /* Log information about the seek, if it's going to occur */
        if(file->fa.flags&H5FD_LOG_LOC_SEEK) {
            if(addr!=file->pos || OP_READ!=file->op)
                HDfprintf(file->logfp,"Seek: From %10a To %10a\n",file->pos,addr);
        } /* end if */

        /* Log information about the read */
        if(file->fa.flags&H5FD_LOG_LOC_READ) {
            /* Output the flavor information, if we have it */
            if(file->fa.flags&H5FD_LOG_FLAVOR)
                HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) Read, flavor=%s\n",addr,addr+size-1,size,flavors[file->flavor[addr]]);
            else
                HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) Read\n",addr,addr+size-1,size);
        } /* end if */
    } /* end if */

    /* Seek to the correct location */
    if ((addr!=file->pos || OP_READ!=file->op) &&
            file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) {
        file->pos = HADDR_UNDEF;
        file->op = OP_UNKNOWN;
        HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
    }

    /*
     * Read data, being careful of interrupted system calls, partial results,
     * and the end of the file.
     */
    while (size>0) {
        do {
            nbytes = HDread(file->fd, buf, size);
        } while (-1==nbytes && EINTR==errno);
        if (-1==nbytes) {
            /* error */
            file->pos = HADDR_UNDEF;
            file->op = OP_UNKNOWN;
            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL, "file read failed")
        }
        if (0==nbytes) {
            /* end of file but not end of format address space */
            HDmemset(buf, 0, size);
            size = 0;
        }
        assert(nbytes>=0);
        assert((size_t)nbytes<=size);
        H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
        size -= (size_t)nbytes;
        H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
        addr += (haddr_t)nbytes;
        buf = (char*)buf + nbytes;
    }
    
    /* Update current position */
    file->pos = addr;
    file->op = OP_READ;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_write
 *
 * Purpose:	Writes SIZE bytes of data to FILE beginning at address ADDR
 *		from buffer BUF according to data transfer properties in
 *		DXPL_ID.
 *
 * Return:	Success:	Zero
 *
 *		Failure:	-1
 *
 * Programmer:	Robb Matzke
 *              Thursday, July 29, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5FD_log_write(H5FD_t *_file, H5FD_mem_t type, hid_t UNUSED dxpl_id, haddr_t addr,
		size_t size, const void *buf)
{
    H5FD_log_t		*file = (H5FD_log_t*)_file;
    ssize_t		nbytes;
    size_t      orig_size=size; /* Save the original size for later */
    haddr_t     orig_addr=addr;
#ifdef H5_HAVE_GETTIMEOFDAY
    struct timeval timeval_start,timeval_stop;
    struct timeval timeval_diff;
#endif /* H5_HAVE_GETTIMEOFDAY */
    herr_t      ret_value=SUCCEED;       /* Return value */
    
    FUNC_ENTER_NOAPI(H5FD_log_write, FAIL)

    assert(file && file->pub.cls);
    assert(size>0);
    assert(buf);

    /* Verify that we are writing out the type of data we allocated in this location */
    assert(type==H5FD_MEM_DEFAULT || type==file->flavor[addr] || file->flavor[addr]==H5FD_MEM_DEFAULT);
    assert(type==H5FD_MEM_DEFAULT || type==file->flavor[(addr+size)-1] || file->flavor[(addr+size)-1]==H5FD_MEM_DEFAULT);

    /* Check for overflow conditions */
    if (HADDR_UNDEF==addr) 
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined")
    if (REGION_OVERFLOW(addr, size))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow")
    if (addr+size>file->eoa)
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow")
    
    /* Log the I/O information about the write */
    if(file->fa.flags&H5FD_LOG_FILE_WRITE) {
        size_t tmp_size=size;
        haddr_t tmp_addr=addr;

        assert((addr+size)<file->iosize);
        while(tmp_size-->0)
            file->nwrite[tmp_addr++]++;
    } /* end if */

    /* Seek to the correct location */
    if (addr!=file->pos || OP_WRITE!=file->op) {
#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_SEEK)
            HDgettimeofday(&timeval_start,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
        if(file_seek(file->fd, (file_offset_t)addr, SEEK_SET)<0) {
            file->pos = HADDR_UNDEF;
            file->op = OP_UNKNOWN;
            HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
        } /* end if */
#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_SEEK)
            HDgettimeofday(&timeval_stop,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */

        /* Log information about the seek */
        if(file->fa.flags&H5FD_LOG_LOC_SEEK) {
#ifdef H5_HAVE_GETTIMEOFDAY
            HDfprintf(file->logfp,"Seek: From %10a To %10a",file->pos,addr);
            if(file->fa.flags&H5FD_LOG_TIME_SEEK) {
                 /* Calculate the elapsed gettimeofday time */
                 timeval_diff.tv_usec=timeval_stop.tv_usec-timeval_start.tv_usec;
                 timeval_diff.tv_sec=timeval_stop.tv_sec-timeval_start.tv_sec;
                 if(timeval_diff.tv_usec<0) {
                     timeval_diff.tv_usec+=1000000;
                     timeval_diff.tv_sec--;
                 } /* end if */
                HDfprintf(file->logfp," (%f s)\n",(double)timeval_diff.tv_sec+((double)timeval_diff.tv_usec/(double)1000000.0));
            } /* end if */
            else 
                HDfprintf(file->logfp,"\n");
#else /* H5_HAVE_GETTIMEOFDAY */
            HDfprintf(file->logfp,"Seek: From %10a To %10a\n",file->pos,addr);
#endif /* H5_HAVE_GETTIMEOFDAY */
        } /* end if */
    } /* end if */

    /*
     * Write the data, being careful of interrupted system calls and partial
     * results
     */
#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_WRITE)
        HDgettimeofday(&timeval_start,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
    while (size>0) {
        do {
            nbytes = HDwrite(file->fd, buf, size);
        } while (-1==nbytes && EINTR==errno);
        if (-1==nbytes) {
            /* error */
            file->pos = HADDR_UNDEF;
            file->op = OP_UNKNOWN;
            if(file->fa.flags&H5FD_LOG_LOC_WRITE)
                HDfprintf(file->logfp,"Error! Writing: %10a-%10a (%10Zu bytes)\n",orig_addr,orig_addr+orig_size-1,orig_size);
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed")
        }
        assert(nbytes>0);
        assert((size_t)nbytes<=size);
        H5_CHECK_OVERFLOW(nbytes,ssize_t,size_t);
        size -= (size_t)nbytes;
        H5_CHECK_OVERFLOW(nbytes,ssize_t,haddr_t);
        addr += (haddr_t)nbytes;
        buf = (const char*)buf + nbytes;
    }
#ifdef H5_HAVE_GETTIMEOFDAY
    if(file->fa.flags&H5FD_LOG_TIME_WRITE)
        HDgettimeofday(&timeval_stop,NULL);
#endif /* H5_HAVE_GETTIMEOFDAY */
    
    /* Log information about the write */
    if(file->fa.flags&H5FD_LOG_LOC_WRITE) {
        /* Output the flavor information, if desired */
        if(file->fa.flags&H5FD_LOG_FLAVOR)
            HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) (%s) Written",orig_addr,orig_addr+orig_size-1,orig_size,flavors[file->flavor[orig_addr]]);
        else
            HDfprintf(file->logfp,"%10a-%10a (%10Zu bytes) Written",orig_addr,orig_addr+orig_size-1,orig_size);

        /* Check if this is the first write into a "default" section, grabbed by the metadata agregation algorithm */
        if(file->fa.flags&H5FD_LOG_FLAVOR) {
            if(file->flavor[orig_addr]==H5FD_MEM_DEFAULT)
                HDmemset(&file->flavor[orig_addr],type,orig_size);
        } /* end if */

#ifdef H5_HAVE_GETTIMEOFDAY
        if(file->fa.flags&H5FD_LOG_TIME_WRITE) {
             /* Calculate the elapsed gettimeofday time */
             timeval_diff.tv_usec=timeval_stop.tv_usec-timeval_start.tv_usec;
             timeval_diff.tv_sec=timeval_stop.tv_sec-timeval_start.tv_sec;
             if(timeval_diff.tv_usec<0) {
                 timeval_diff.tv_usec+=1000000;
                 timeval_diff.tv_sec--;
             } /* end if */
            HDfprintf(file->logfp," (%f s)\n",(double)timeval_diff.tv_sec+((double)timeval_diff.tv_usec/(double)1000000.0));
        } /* end if */
        else
            HDfprintf(file->logfp,"\n");
#else /* H5_HAVE_GETTIMEOFDAY */
        HDfprintf(file->logfp,"\n");
#endif /* H5_HAVE_GETTIMEOFDAY */
    } /* end if */

    /* Update current position and eof */
    file->pos = addr;
    file->op = OP_WRITE;
    if (file->pos>file->eof)
        file->eof = file->pos;

done:
    FUNC_LEAVE_NOAPI(ret_value)
}


/*-------------------------------------------------------------------------
 * Function:	H5FD_log_flush
 *
 * Purpose:	Makes sure that the true file size is the same (or larger)
 *		than the end-of-address.
 *
 * Return:	Success:	Non-negative
 *
 *		Failure:	Negative
 *
 * Programmer:	Robb Matzke
 *              Wednesday, August  4, 1999
 *
 * Modifications:
 *
 *-------------------------------------------------------------------------
 */
/* ARGSUSED */
static herr_t
H5FD_log_flush(H5FD_t *_file, hid_t UNUSED dxpl_id, unsigned UNUSED closing)
{
    H5FD_log_t	*file = (H5FD_log_t*)_file;
    herr_t      ret_value=SUCCEED;       /* Return value */

    FUNC_ENTER_NOAPI(H5FD_log_flush, FAIL)

    if (file->eoa>file->eof) {
        if (-1==file_seek(file->fd, (file_offset_t)(file->eoa-1), SEEK_SET))
            HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
        if (write(file->fd, "", 1)!=1)
            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL, "file write failed")
        file->eof = file->eoa;
        file->pos = file->eoa;
        file->op = OP_WRITE;
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
}