summaryrefslogtreecommitdiffstats
path: root/src/H5FDsec2.c
blob: 15accf76d33b9a2af3a553ecdfd2a4ca5cb47b19 (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
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF5.  The full HDF5 copyright notice, including     *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://www.hdfgroup.org/licenses.               *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/*
 * 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).
 */

#include "H5FDdrvr_module.h" /* This source code file is part of the H5FD driver module */

#include "H5private.h"   /* Generic Functions        */
#include "H5Eprivate.h"  /* Error handling           */
#include "H5Fprivate.h"  /* File access              */
#include "H5FDprivate.h" /* File drivers             */
#include "H5FDsec2.h"    /* Sec2 file driver         */
#include "H5FLprivate.h" /* Free Lists               */
#include "H5Iprivate.h"  /* IDs                      */
#include "H5MMprivate.h" /* Memory management        */
#include "H5Pprivate.h"  /* Property lists           */

/* The driver identification number, initialized at runtime */
static hid_t H5FD_SEC2_g = 0;

/* Whether to ignore file locks when disabled (env var value) */
static htri_t ignore_disabled_file_locks_s = FAIL;

/* 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 filesystem 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_sec2_t {
    H5FD_t         pub; /* public stuff, must be first      */
    int            fd;  /* the filesystem file descriptor   */
    haddr_t        eoa; /* end of allocated region          */
    haddr_t        eof; /* end of file; current file size   */
    haddr_t        pos; /* current file I/O position        */
    H5FD_file_op_t op;  /* last operation                   */
    bool           ignore_disabled_file_locks;
    char           filename[H5FD_MAX_FILENAME_LEN]; /* Copy of file name from open operation */
#ifndef H5_HAVE_WIN32_API
    /* On most systems the combination of device and i-node number uniquely
     * identify a file.  Note that Cygwin, MinGW and other Windows POSIX
     * environments have the stat function (which fakes inodes)
     * and will use the 'device + inodes' scheme as opposed to the
     * Windows code further below.
     */
    dev_t device; /* file device number   */
    ino_t inode;  /* file i-node number   */
#else
    /* Files in windows are uniquely identified by the volume serial
     * number and the file index (both low and high parts).
     *
     * There are caveats where these numbers can change, especially
     * on FAT file systems.  On NTFS, however, a file should keep
     * those numbers the same until renamed or deleted (though you
     * can use ReplaceFile() on NTFS to keep the numbers the same
     * while renaming).
     *
     * See the MSDN "BY_HANDLE_FILE_INFORMATION Structure" entry for
     * more information.
     *
     * http://msdn.microsoft.com/en-us/library/aa363788(v=VS.85).aspx
     */
    DWORD nFileIndexLow;
    DWORD nFileIndexHigh;
    DWORD dwVolumeSerialNumber;

    HANDLE hFile; /* Native windows file handle */
#endif /* H5_HAVE_WIN32_API */

    /* Information from properties set by 'h5repart' tool
     *
     * Whether to eliminate the family driver info and convert this file to
     * a single file.
     */
    bool fam_to_single;
} H5FD_sec2_t;

/*
 * These macros check for overflow of various quantities.  These macros
 * assume that HDoff_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(HDoff_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) || HADDR_UNDEF == (A) + (Z) || (HDoff_t)((A) + (Z)) < (HDoff_t)(A))

/* Prototypes */
static herr_t  H5FD__sec2_term(void);
static H5FD_t *H5FD__sec2_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr);
static herr_t  H5FD__sec2_close(H5FD_t *_file);
static int     H5FD__sec2_cmp(const H5FD_t *_f1, const H5FD_t *_f2);
static herr_t  H5FD__sec2_query(const H5FD_t *_f1, unsigned long *flags);
static haddr_t H5FD__sec2_get_eoa(const H5FD_t *_file, H5FD_mem_t type);
static herr_t  H5FD__sec2_set_eoa(H5FD_t *_file, H5FD_mem_t type, haddr_t addr);
static haddr_t H5FD__sec2_get_eof(const H5FD_t *_file, H5FD_mem_t type);
static herr_t  H5FD__sec2_get_handle(H5FD_t *_file, hid_t fapl, void **file_handle);
static herr_t  H5FD__sec2_read(H5FD_t *_file, H5FD_mem_t type, hid_t fapl_id, haddr_t addr, size_t size,
                               void *buf);
static herr_t  H5FD__sec2_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__sec2_truncate(H5FD_t *_file, hid_t dxpl_id, bool closing);
static herr_t  H5FD__sec2_lock(H5FD_t *_file, bool rw);
static herr_t  H5FD__sec2_unlock(H5FD_t *_file);
static herr_t  H5FD__sec2_delete(const char *filename, hid_t fapl_id);
static herr_t  H5FD__sec2_ctl(H5FD_t *_file, uint64_t op_code, uint64_t flags, const void *input,
                              void **output);

static const H5FD_class_t H5FD_sec2_g = {
    H5FD_CLASS_VERSION,    /* struct version       */
    H5FD_SEC2_VALUE,       /* value                */
    "sec2",                /* name                 */
    MAXADDR,               /* maxaddr              */
    H5F_CLOSE_WEAK,        /* fc_degree            */
    H5FD__sec2_term,       /* terminate            */
    NULL,                  /* sb_size              */
    NULL,                  /* sb_encode            */
    NULL,                  /* sb_decode            */
    0,                     /* fapl_size            */
    NULL,                  /* fapl_get             */
    NULL,                  /* fapl_copy            */
    NULL,                  /* fapl_free            */
    0,                     /* dxpl_size            */
    NULL,                  /* dxpl_copy            */
    NULL,                  /* dxpl_free            */
    H5FD__sec2_open,       /* open                 */
    H5FD__sec2_close,      /* close                */
    H5FD__sec2_cmp,        /* cmp                  */
    H5FD__sec2_query,      /* query                */
    NULL,                  /* get_type_map         */
    NULL,                  /* alloc                */
    NULL,                  /* free                 */
    H5FD__sec2_get_eoa,    /* get_eoa              */
    H5FD__sec2_set_eoa,    /* set_eoa              */
    H5FD__sec2_get_eof,    /* get_eof              */
    H5FD__sec2_get_handle, /* get_handle           */
    H5FD__sec2_read,       /* read                 */
    H5FD__sec2_write,      /* write                */
    NULL,                  /* read_vector          */
    NULL,                  /* write_vector         */
    NULL,                  /* read_selection       */
    NULL,                  /* write_selection      */
    NULL,                  /* flush                */
    H5FD__sec2_truncate,   /* truncate             */
    H5FD__sec2_lock,       /* lock                 */
    H5FD__sec2_unlock,     /* unlock               */
    H5FD__sec2_delete,     /* del                  */
    H5FD__sec2_ctl,        /* ctl                  */
    H5FD_FLMAP_DICHOTOMY   /* fl_map               */
};

/* Declare a free list to manage the H5FD_sec2_t struct */
H5FL_DEFINE_STATIC(H5FD_sec2_t);

/*-------------------------------------------------------------------------
 * Function:    H5FD_sec2_init
 *
 * Purpose:     Initialize this driver by registering the driver with the
 *              library.
 *
 * Return:      Success:    The driver ID for the sec2 driver
 *              Failure:    H5I_INVALID_HID
 *
 *-------------------------------------------------------------------------
 */
hid_t
H5FD_sec2_init(void)
{
    char *lock_env_var = NULL;            /* Environment variable pointer */
    hid_t ret_value    = H5I_INVALID_HID; /* Return value */

    FUNC_ENTER_NOAPI_NOERR

    /* Check the use disabled file locks environment variable */
    lock_env_var = getenv(HDF5_USE_FILE_LOCKING);
    if (lock_env_var && !strcmp(lock_env_var, "BEST_EFFORT"))
        ignore_disabled_file_locks_s = true; /* Override: Ignore disabled locks */
    else if (lock_env_var && (!strcmp(lock_env_var, "TRUE") || !strcmp(lock_env_var, "1")))
        ignore_disabled_file_locks_s = false; /* Override: Don't ignore disabled locks */
    else
        ignore_disabled_file_locks_s = FAIL; /* Environment variable not set, or not set correctly */

    if (H5I_VFL != H5I_get_type(H5FD_SEC2_g))
        H5FD_SEC2_g = H5FD_register(&H5FD_sec2_g, sizeof(H5FD_class_t), false);

    /* Set return value */
    ret_value = H5FD_SEC2_g;

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD_sec2_init() */

/*---------------------------------------------------------------------------
 * Function:    H5FD__sec2_term
 *
 * Purpose:     Shut down the VFD
 *
 * Returns:     SUCCEED (Can't fail)
 *
 *---------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_term(void)
{
    FUNC_ENTER_PACKAGE_NOERR

    /* Reset VFL ID */
    H5FD_SEC2_g = 0;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5FD__sec2_term() */

/*-------------------------------------------------------------------------
 * Function:    H5Pset_fapl_sec2
 *
 * Purpose:     Modify the file access property list to use the H5FD_SEC2
 *              driver defined in this source file.  There are no driver
 *              specific properties.
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
herr_t
H5Pset_fapl_sec2(hid_t fapl_id)
{
    H5P_genplist_t *plist; /* Property list pointer */
    herr_t          ret_value;

    FUNC_ENTER_API(FAIL)
    H5TRACE1("e", "i", fapl_id);

    if (NULL == (plist = H5P_object_verify(fapl_id, H5P_FILE_ACCESS)))
        HGOTO_ERROR(H5E_ARGS, H5E_BADTYPE, FAIL, "not a file access property list");

    ret_value = H5P_set_driver(plist, H5FD_SEC2, NULL, NULL);

done:
    FUNC_LEAVE_API(ret_value)
} /* end H5Pset_fapl_sec2() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_open
 *
 * Purpose:     Create and/or opens a 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
 *
 *-------------------------------------------------------------------------
 */
static H5FD_t *
H5FD__sec2_open(const char *name, unsigned flags, hid_t fapl_id, haddr_t maxaddr)
{
    H5FD_sec2_t *file = NULL; /* sec2 VFD info            */
    int          fd   = -1;   /* File descriptor          */
    int          o_flags;     /* Flags for open() call    */
#ifdef H5_HAVE_WIN32_API
    struct _BY_HANDLE_FILE_INFORMATION fileinfo;
#endif
    h5_stat_t       sb;
    H5P_genplist_t *plist;            /* Property list pointer */
    H5FD_t         *ret_value = NULL; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check on file offsets */
    HDcompile_assert(sizeof(HDoff_t) >= sizeof(size_t));

    /* 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, H5_POSIX_CREATE_MODE_RW)) < 0) {
        int myerrno = errno;
        HGOTO_ERROR(
            H5E_FILE, H5E_CANTOPENFILE, NULL,
            "unable to open file: name = '%s', errno = %d, error message = '%s', flags = %x, o_flags = %x",
            name, myerrno, strerror(myerrno), flags, (unsigned)o_flags);
    } /* end if */

    if (HDfstat(fd, &sb) < 0)
        HSYS_GOTO_ERROR(H5E_FILE, H5E_BADFILE, NULL, "unable to fstat file")

    /* Create the new file struct */
    if (NULL == (file = H5FL_CALLOC(H5FD_sec2_t)))
        HGOTO_ERROR(H5E_RESOURCE, H5E_NOSPACE, NULL, "unable to allocate file struct");

    file->fd = fd;
    H5_CHECKED_ASSIGN(file->eof, haddr_t, sb.st_size, h5_stat_size_t);
    file->pos = HADDR_UNDEF;
    file->op  = OP_UNKNOWN;
#ifdef H5_HAVE_WIN32_API
    file->hFile = (HANDLE)_get_osfhandle(fd);
    if (INVALID_HANDLE_VALUE == file->hFile)
        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to get Windows file handle");

    if (!GetFileInformationByHandle((HANDLE)file->hFile, &fileinfo))
        HGOTO_ERROR(H5E_FILE, H5E_CANTOPENFILE, NULL, "unable to get Windows file information");

    file->nFileIndexHigh       = fileinfo.nFileIndexHigh;
    file->nFileIndexLow        = fileinfo.nFileIndexLow;
    file->dwVolumeSerialNumber = fileinfo.dwVolumeSerialNumber;
#else  /* H5_HAVE_WIN32_API */
    file->device = sb.st_dev;
    file->inode  = sb.st_ino;
#endif /* H5_HAVE_WIN32_API */

    /* Get the FAPL */
    if (NULL == (plist = (H5P_genplist_t *)H5I_object(fapl_id)))
        HGOTO_ERROR(H5E_VFL, H5E_BADTYPE, NULL, "not a file access property list");

    /* Check the file locking flags in the fapl */
    if (ignore_disabled_file_locks_s != FAIL)
        /* The environment variable was set, so use that preferentially */
        file->ignore_disabled_file_locks = ignore_disabled_file_locks_s;
    else {
        /* Use the value in the property list */
        if (H5P_get(plist, H5F_ACS_IGNORE_DISABLED_FILE_LOCKS_NAME, &file->ignore_disabled_file_locks) < 0)
            HGOTO_ERROR(H5E_VFL, H5E_CANTGET, NULL, "can't get ignore disabled file locks property");
    }

    /* Retain a copy of the name used to open the file, for possible error reporting */
    strncpy(file->filename, name, sizeof(file->filename) - 1);
    file->filename[sizeof(file->filename) - 1] = '\0';

    /* Check for non-default FAPL */
    if (H5P_FILE_ACCESS_DEFAULT != fapl_id) {

        /* This step is for h5repart tool only. If user wants to change file driver from
         * family to one that uses single files (sec2, etc.) while using h5repart, this
         * private property should be set so that in the later step, the library can ignore
         * the family driver information saved in the superblock.
         */
        if (H5P_exist_plist(plist, H5F_ACS_FAMILY_TO_SINGLE_NAME) > 0)
            if (H5P_get(plist, H5F_ACS_FAMILY_TO_SINGLE_NAME, &file->fam_to_single) < 0)
                HGOTO_ERROR(H5E_VFL, H5E_CANTGET, NULL, "can't get property of changing family to single");
    } /* end if */

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

done:
    if (NULL == ret_value) {
        if (fd >= 0)
            HDclose(fd);
        if (file)
            file = H5FL_FREE(H5FD_sec2_t, file);
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_open() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_close
 *
 * Purpose:     Closes an HDF5 file.
 *
 * Return:      Success:    SUCCEED
 *              Failure:    FAIL, file not closed.
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_close(H5FD_t *_file)
{
    H5FD_sec2_t *file      = (H5FD_sec2_t *)_file;
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    /* Sanity check */
    assert(file);

    /* Close the underlying file */
    if (HDclose(file->fd) < 0)
        HSYS_GOTO_ERROR(H5E_IO, H5E_CANTCLOSEFILE, FAIL, "unable to close file")

    /* Release the file info */
    file = H5FL_FREE(H5FD_sec2_t, file);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_close() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_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).
 *
 *-------------------------------------------------------------------------
 */
static int
H5FD__sec2_cmp(const H5FD_t *_f1, const H5FD_t *_f2)
{
    const H5FD_sec2_t *f1        = (const H5FD_sec2_t *)_f1;
    const H5FD_sec2_t *f2        = (const H5FD_sec2_t *)_f2;
    int                ret_value = 0;

    FUNC_ENTER_PACKAGE_NOERR

#ifdef H5_HAVE_WIN32_API
    if (f1->dwVolumeSerialNumber < f2->dwVolumeSerialNumber)
        HGOTO_DONE(-1);
    if (f1->dwVolumeSerialNumber > f2->dwVolumeSerialNumber)
        HGOTO_DONE(1);

    if (f1->nFileIndexHigh < f2->nFileIndexHigh)
        HGOTO_DONE(-1);
    if (f1->nFileIndexHigh > f2->nFileIndexHigh)
        HGOTO_DONE(1);

    if (f1->nFileIndexLow < f2->nFileIndexLow)
        HGOTO_DONE(-1);
    if (f1->nFileIndexLow > f2->nFileIndexLow)
        HGOTO_DONE(1);
#else /* H5_HAVE_WIN32_API */
#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 (memcmp(&(f1->device), &(f2->device), sizeof(dev_t)) < 0)
        HGOTO_DONE(-1);
    if (memcmp(&(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 /* H5_HAVE_WIN32_API */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_cmp() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_query
 *
 * Purpose:     Set the flags that this VFL driver is capable of supporting.
 *              (listed in H5FDpublic.h)
 *
 * Return:      SUCCEED (Can't fail)
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_query(const H5FD_t *_file, unsigned long *flags /* out */)
{
    const H5FD_sec2_t *file = (const H5FD_sec2_t *)_file; /* sec2 VFD info */

    FUNC_ENTER_PACKAGE_NOERR

    /* Set the VFL feature flags that this driver supports */
    /* Notice: the Mirror VFD Writer currently uses only the Sec2 driver as
     * the underlying driver -- as such, the Mirror VFD implementation copies
     * these feature flags as its own. Any modifications made here must be
     * reflected in H5FDmirror.c
     * -- JOS 2020-01-13
     */
    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 */
        *flags |= H5FD_FEAT_POSIX_COMPAT_HANDLE; /* get_handle callback returns a POSIX file descriptor */
        *flags |=
            H5FD_FEAT_SUPPORTS_SWMR_IO; /* VFD supports the single-writer/multiple-readers (SWMR) pattern   */
        *flags |= H5FD_FEAT_DEFAULT_VFD_COMPATIBLE; /* VFD creates a file which can be opened with the default
                                                       VFD      */

        /* Check for flags that are set by h5repart */
        if (file && file->fam_to_single)
            *flags |= H5FD_FEAT_IGNORE_DRVRINFO; /* Ignore the driver info when file is opened (which
                                                    eliminates it) */
    }                                            /* end if */

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5FD__sec2_query() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_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:      The end-of-address marker.
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD__sec2_get_eoa(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
{
    const H5FD_sec2_t *file = (const H5FD_sec2_t *)_file;

    FUNC_ENTER_PACKAGE_NOERR

    FUNC_LEAVE_NOAPI(file->eoa)
} /* end H5FD__sec2_get_eoa() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_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:      SUCCEED (Can't fail)
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_set_eoa(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, haddr_t addr)
{
    H5FD_sec2_t *file = (H5FD_sec2_t *)_file;

    FUNC_ENTER_PACKAGE_NOERR

    file->eoa = addr;

    FUNC_LEAVE_NOAPI(SUCCEED)
} /* end H5FD__sec2_set_eoa() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_get_eof
 *
 * Purpose:     Returns the end-of-file marker, which is the greater of
 *              either the filesystem end-of-file or the HDF5 end-of-address
 *              markers.
 *
 * Return:      End of file address, the first address past the end of the
 *              "file", either the filesystem file or the HDF5 file.
 *
 *-------------------------------------------------------------------------
 */
static haddr_t
H5FD__sec2_get_eof(const H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type)
{
    const H5FD_sec2_t *file = (const H5FD_sec2_t *)_file;

    FUNC_ENTER_PACKAGE_NOERR

    FUNC_LEAVE_NOAPI(file->eof)
} /* end H5FD__sec2_get_eof() */

/*-------------------------------------------------------------------------
 * Function:       H5FD__sec2_get_handle
 *
 * Purpose:        Returns the file handle of sec2 file driver.
 *
 * Returns:        SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_get_handle(H5FD_t *_file, hid_t H5_ATTR_UNUSED fapl, void **file_handle)
{
    H5FD_sec2_t *file      = (H5FD_sec2_t *)_file;
    herr_t       ret_value = SUCCEED;

    FUNC_ENTER_PACKAGE

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

    *file_handle = &(file->fd);

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_get_handle() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_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:    SUCCEED. Result is stored in caller-supplied
 *                          buffer BUF.
 *              Failure:    FAIL, Contents of buffer BUF are undefined.
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_read(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNUSED dxpl_id, haddr_t addr,
                size_t size, void *buf /*out*/)
{
    H5FD_sec2_t *file      = (H5FD_sec2_t *)_file;
    HDoff_t      offset    = (HDoff_t)addr;
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

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

    /* Check for overflow conditions */
    if (!H5_addr_defined(addr))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined, addr = %llu", (unsigned long long)addr);
    if (REGION_OVERFLOW(addr, size))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow, addr = %llu", (unsigned long long)addr);

#ifndef H5_HAVE_PREADWRITE
    /* Seek to the correct location (if we don't have pread) */
    if (addr != file->pos || OP_READ != file->op)
        if (HDlseek(file->fd, (HDoff_t)addr, SEEK_SET) < 0)
            HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
#endif /* H5_HAVE_PREADWRITE */

    /* Read data, being careful of interrupted system calls, partial results,
     * and the end of the file.
     */
    while (size > 0) {
        h5_posix_io_t     bytes_in   = 0;  /* # of bytes to read       */
        h5_posix_io_ret_t bytes_read = -1; /* # of bytes actually read */

        /* Trying to read more bytes than the return type can handle is
         * undefined behavior in POSIX.
         */
        if (size > H5_POSIX_MAX_IO_BYTES)
            bytes_in = H5_POSIX_MAX_IO_BYTES;
        else
            bytes_in = (h5_posix_io_t)size;

        do {
#ifdef H5_HAVE_PREADWRITE
            bytes_read = HDpread(file->fd, buf, bytes_in, offset);
            if (bytes_read > 0)
                offset += bytes_read;
#else
            bytes_read  = HDread(file->fd, buf, bytes_in);
#endif /* H5_HAVE_PREADWRITE */
        } while (-1 == bytes_read && EINTR == errno);

        if (-1 == bytes_read) { /* error */
            int    myerrno = errno;
            time_t mytime  = HDtime(NULL);

            offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);

            HGOTO_ERROR(H5E_IO, H5E_READERROR, FAIL,
                        "file read failed: time = %s, filename = '%s', file descriptor = %d, errno = %d, "
                        "error message = '%s', buf = %p, total read size = %llu, bytes this sub-read = %llu, "
                        "bytes actually read = %llu, offset = %llu",
                        HDctime(&mytime), file->filename, file->fd, myerrno, strerror(myerrno), buf,
                        (unsigned long long)size, (unsigned long long)bytes_in,
                        (unsigned long long)bytes_read, (unsigned long long)offset);
        } /* end if */

        if (0 == bytes_read) {
            /* end of file but not end of format address space */
            memset(buf, 0, size);
            break;
        } /* end if */

        assert(bytes_read >= 0);
        assert((size_t)bytes_read <= size);

        size -= (size_t)bytes_read;
        addr += (haddr_t)bytes_read;
        buf = (char *)buf + bytes_read;
    } /* end while */

    /* Update current position */
    file->pos = addr;
    file->op  = OP_READ;

done:
    if (ret_value < 0) {
        /* Reset last file I/O information */
        file->pos = HADDR_UNDEF;
        file->op  = OP_UNKNOWN;
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_read() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_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:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_write(H5FD_t *_file, H5FD_mem_t H5_ATTR_UNUSED type, hid_t H5_ATTR_UNUSED dxpl_id, haddr_t addr,
                 size_t size, const void *buf)
{
    H5FD_sec2_t *file      = (H5FD_sec2_t *)_file;
    HDoff_t      offset    = (HDoff_t)addr;
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

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

    /* Check for overflow conditions */
    if (!H5_addr_defined(addr))
        HGOTO_ERROR(H5E_ARGS, H5E_BADVALUE, FAIL, "addr undefined, addr = %llu", (unsigned long long)addr);
    if (REGION_OVERFLOW(addr, size))
        HGOTO_ERROR(H5E_ARGS, H5E_OVERFLOW, FAIL, "addr overflow, addr = %llu, size = %llu",
                    (unsigned long long)addr, (unsigned long long)size);

#ifndef H5_HAVE_PREADWRITE
    /* Seek to the correct location (if we don't have pwrite) */
    if (addr != file->pos || OP_WRITE != file->op)
        if (HDlseek(file->fd, (HDoff_t)addr, SEEK_SET) < 0)
            HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to seek to proper position")
#endif /* H5_HAVE_PREADWRITE */

    /* Write the data, being careful of interrupted system calls and partial
     * results
     */
    while (size > 0) {
        h5_posix_io_t     bytes_in    = 0;  /* # of bytes to write  */
        h5_posix_io_ret_t bytes_wrote = -1; /* # of bytes written   */

        /* Trying to write more bytes than the return type can handle is
         * undefined behavior in POSIX.
         */
        if (size > H5_POSIX_MAX_IO_BYTES)
            bytes_in = H5_POSIX_MAX_IO_BYTES;
        else
            bytes_in = (h5_posix_io_t)size;

        do {
#ifdef H5_HAVE_PREADWRITE
            bytes_wrote = HDpwrite(file->fd, buf, bytes_in, offset);
            if (bytes_wrote > 0)
                offset += bytes_wrote;
#else
            bytes_wrote = HDwrite(file->fd, buf, bytes_in);
#endif /* H5_HAVE_PREADWRITE */
        } while (-1 == bytes_wrote && EINTR == errno);

        if (-1 == bytes_wrote) { /* error */
            int    myerrno = errno;
            time_t mytime  = HDtime(NULL);

            offset = HDlseek(file->fd, (HDoff_t)0, SEEK_CUR);

            HGOTO_ERROR(H5E_IO, H5E_WRITEERROR, FAIL,
                        "file write failed: time = %s, filename = '%s', file descriptor = %d, errno = %d, "
                        "error message = '%s', buf = %p, total write size = %llu, bytes this sub-write = "
                        "%llu, bytes actually written = %llu, offset = %llu",
                        HDctime(&mytime), file->filename, file->fd, myerrno, strerror(myerrno), buf,
                        (unsigned long long)size, (unsigned long long)bytes_in,
                        (unsigned long long)bytes_wrote, (unsigned long long)offset);
        } /* end if */

        assert(bytes_wrote > 0);
        assert((size_t)bytes_wrote <= size);

        size -= (size_t)bytes_wrote;
        addr += (haddr_t)bytes_wrote;
        buf = (const char *)buf + bytes_wrote;
    } /* end while */

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

done:
    if (ret_value < 0) {
        /* Reset last file I/O information */
        file->pos = HADDR_UNDEF;
        file->op  = OP_UNKNOWN;
    } /* end if */

    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_write() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_truncate
 *
 * Purpose:     Makes sure that the true file size is the same (or larger)
 *              than the end-of-address.
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_truncate(H5FD_t *_file, hid_t H5_ATTR_UNUSED dxpl_id, bool H5_ATTR_UNUSED closing)
{
    H5FD_sec2_t *file      = (H5FD_sec2_t *)_file;
    herr_t       ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    assert(file);

    /* Extend the file to make sure it's large enough */
    if (!H5_addr_eq(file->eoa, file->eof)) {
#ifdef H5_HAVE_WIN32_API
        LARGE_INTEGER li;       /* 64-bit (union) integer for SetFilePointer() call */
        DWORD         dwPtrLow; /* Low-order pointer bits from SetFilePointer()
                                 * Only used as an error code here.
                                 */
        DWORD dwError;          /* DWORD error code from GetLastError() */
        BOOL  bError;           /* Boolean error flag */

        /* Windows uses this odd QuadPart union for 32/64-bit portability */
        li.QuadPart = (LONGLONG)file->eoa;

        /* Extend the file to make sure it's large enough.
         *
         * Since INVALID_SET_FILE_POINTER can technically be a valid return value
         * from SetFilePointer(), we also need to check GetLastError().
         */
        dwPtrLow = SetFilePointer(file->hFile, li.LowPart, &li.HighPart, FILE_BEGIN);
        if (INVALID_SET_FILE_POINTER == dwPtrLow) {
            dwError = GetLastError();
            if (dwError != NO_ERROR)
                HGOTO_ERROR(H5E_FILE, H5E_FILEOPEN, FAIL, "unable to set file pointer");
        }

        bError = SetEndOfFile(file->hFile);
        if (0 == bError)
            HGOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to extend file properly");
#else  /* H5_HAVE_WIN32_API */
        if (-1 == HDftruncate(file->fd, (HDoff_t)file->eoa))
            HSYS_GOTO_ERROR(H5E_IO, H5E_SEEKERROR, FAIL, "unable to extend file properly")
#endif /* H5_HAVE_WIN32_API */

        /* Update the eof value */
        file->eof = file->eoa;

        /* Reset last file I/O information */
        file->pos = HADDR_UNDEF;
        file->op  = OP_UNKNOWN;
    } /* end if */

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_truncate() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_lock
 *
 * Purpose:     To place an advisory lock on a file.
 *		The lock type to apply depends on the parameter "rw":
 *			true--opens for write: an exclusive lock
 *			false--opens for read: a shared lock
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_lock(H5FD_t *_file, bool rw)
{
    H5FD_sec2_t *file = (H5FD_sec2_t *)_file; /* VFD file struct          */
    int          lock_flags;                  /* file locking flags       */
    herr_t       ret_value = SUCCEED;         /* Return value             */

    FUNC_ENTER_PACKAGE

    assert(file);

    /* Set exclusive or shared lock based on rw status */
    lock_flags = rw ? LOCK_EX : LOCK_SH;

    /* Place a non-blocking lock on the file */
    if (HDflock(file->fd, lock_flags | LOCK_NB) < 0) {
        if (file->ignore_disabled_file_locks && ENOSYS == errno) {
            /* When errno is set to ENOSYS, the file system does not support
             * locking, so ignore it.
             */
            errno = 0;
        }
        else
            HSYS_GOTO_ERROR(H5E_VFL, H5E_CANTLOCKFILE, FAIL, "unable to lock file")
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_lock() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_unlock
 *
 * Purpose:     To remove the existing lock on the file
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_unlock(H5FD_t *_file)
{
    H5FD_sec2_t *file      = (H5FD_sec2_t *)_file; /* VFD file struct          */
    herr_t       ret_value = SUCCEED;              /* Return value             */

    FUNC_ENTER_PACKAGE

    assert(file);

    if (HDflock(file->fd, LOCK_UN) < 0) {
        if (file->ignore_disabled_file_locks && ENOSYS == errno) {
            /* When errno is set to ENOSYS, the file system does not support
             * locking, so ignore it.
             */
            errno = 0;
        }
        else
            HSYS_GOTO_ERROR(H5E_VFL, H5E_CANTUNLOCKFILE, FAIL, "unable to unlock file")
    }

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_unlock() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_delete
 *
 * Purpose:     Delete a file
 *
 * Return:      SUCCEED/FAIL
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_delete(const char *filename, hid_t H5_ATTR_UNUSED fapl_id)
{
    herr_t ret_value = SUCCEED; /* Return value */

    FUNC_ENTER_PACKAGE

    assert(filename);

    if (HDremove(filename) < 0)
        HSYS_GOTO_ERROR(H5E_VFL, H5E_CANTDELETEFILE, FAIL, "unable to delete file")

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_delete() */

/*-------------------------------------------------------------------------
 * Function:    H5FD__sec2_ctl
 *
 * Purpose:     Sec2 VFD version of the ctl callback.
 *
 *              The desired operation is specified by the op_code
 *              parameter.
 *
 *              The flags parameter controls management of op_codes that
 *              are unknown to the callback
 *
 *              The input and output parameters allow op_code specific
 *              input and output
 *
 *              At present, no op codes are supported by this VFD.
 *
 * Return:      Non-negative on success/Negative on failure
 *
 *-------------------------------------------------------------------------
 */
static herr_t
H5FD__sec2_ctl(H5FD_t H5_ATTR_UNUSED *_file, uint64_t H5_ATTR_UNUSED op_code, uint64_t flags,
               const void H5_ATTR_UNUSED *input, void H5_ATTR_UNUSED **output)
{
    herr_t ret_value = SUCCEED;

    FUNC_ENTER_PACKAGE

    /* No op codes are understood. */
    if (flags & H5FD_CTL_FAIL_IF_UNKNOWN_FLAG)
        HGOTO_ERROR(H5E_VFL, H5E_FCNTL, FAIL, "unknown op_code and fail if unknown flag is set");

done:
    FUNC_LEAVE_NOAPI(ret_value)
} /* end H5FD__sec2_ctl() */