summaryrefslogtreecommitdiffstats
path: root/qemu-img.c
blob: a3d15e716bb556da5a7551c8b40eed1fa4055ad9 (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
/*
 * QEMU disk image utility
 *
 * Copyright (c) 2003-2008 Fabrice Bellard
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in
 * all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
 * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
 * THE SOFTWARE.
 */
#include "qemu-common.h"
#include "osdep.h"
#include "block_int.h"
#include <stdio.h>

#ifdef _WIN32
#include <windows.h>
#endif

/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
#define BRDV_O_FLAGS BDRV_O_CACHE_WB

static void QEMU_NORETURN error(const char *fmt, ...)
{
    va_list ap;
    va_start(ap, fmt);
    fprintf(stderr, "qemu-img: ");
    vfprintf(stderr, fmt, ap);
    fprintf(stderr, "\n");
    exit(1);
    va_end(ap);
}

static void format_print(void *opaque, const char *name)
{
    printf(" %s", name);
}

/* Please keep in synch with qemu-img.texi */
static void help(void)
{
    printf("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
           "usage: qemu-img command [command options]\n"
           "QEMU disk image utility\n"
           "\n"
           "Command syntax:\n"
           "  check [-f fmt] filename\n"
           "  create [-e] [-6] [-F fmt] [-b base_image] [-f fmt] filename [size]\n"
           "  commit [-f fmt] filename\n"
           "  convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] [-B output_base_image] filename [filename2 [...]] output_filename\n"
           "  info [-f fmt] filename\n"
           "  snapshot [-l | -a snapshot | -c snapshot | -d snapshot] filename\n"
           "\n"
           "Command parameters:\n"
           "  'filename' is a disk image filename\n"
           "  'base_image' is the read-only disk image which is used as base for a copy on\n"
           "    write image; the copy on write image only stores the modified data\n"
           "  'output_base_image' forces the output image to be created as a copy on write\n"
           "    image of the specified base image; 'output_base_image' should have the same\n"
           "    content as the input's base image, however the path, image format, etc may\n"
           "    differ\n"
           "  'fmt' is the disk image format. It is guessed automatically in most cases\n"
           "  'size' is the disk image size in kilobytes. Optional suffixes\n"
           "    'M' (megabyte, 1024 * 1024) and 'G' (gigabyte, 1024 * 1024 * 1024) are\n"
           "    supported any 'k' or 'K' is ignored\n"
           "  'output_filename' is the destination disk image filename\n"
           "  'output_fmt' is the destination format\n"
           "  '-c' indicates that target image must be compressed (qcow format only)\n"
           "  '-e' indicates that the target image must be encrypted (qcow format only)\n"
           "  '-6' indicates that the target image must use compatibility level 6 (vmdk format only)\n"
           "  '-h' with or without a command shows this help and lists the supported formats\n"
           "\n"
           "Parameters to snapshot subcommand:\n"
           "  'snapshot' is the name of the snapshot to create, apply or delete\n"
           "  '-a' applies a snapshot (revert disk to saved state)\n"
           "  '-c' creates a snapshot\n"
           "  '-d' deletes a snapshot\n"
           "  '-l' lists all snapshots in the given image\n"
           );
    printf("\nSupported formats:");
    bdrv_iterate_format(format_print, NULL);
    printf("\n");
    exit(1);
}

#if defined(WIN32)
/* XXX: put correct support for win32 */
static int read_password(char *buf, int buf_size)
{
    int c, i;
    printf("Password: ");
    fflush(stdout);
    i = 0;
    for(;;) {
        c = getchar();
        if (c == '\n')
            break;
        if (i < (buf_size - 1))
            buf[i++] = c;
    }
    buf[i] = '\0';
    return 0;
}

#else

#include <termios.h>

static struct termios oldtty;

static void term_exit(void)
{
    tcsetattr (0, TCSANOW, &oldtty);
}

static void term_init(void)
{
    struct termios tty;

    tcgetattr (0, &tty);
    oldtty = tty;

    tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
                          |INLCR|IGNCR|ICRNL|IXON);
    tty.c_oflag |= OPOST;
    tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
    tty.c_cflag &= ~(CSIZE|PARENB);
    tty.c_cflag |= CS8;
    tty.c_cc[VMIN] = 1;
    tty.c_cc[VTIME] = 0;

    tcsetattr (0, TCSANOW, &tty);

    atexit(term_exit);
}

static int read_password(char *buf, int buf_size)
{
    uint8_t ch;
    int i, ret;

    printf("password: ");
    fflush(stdout);
    term_init();
    i = 0;
    for(;;) {
        ret = read(0, &ch, 1);
        if (ret == -1) {
            if (errno == EAGAIN || errno == EINTR) {
                continue;
            } else {
                ret = -1;
                break;
            }
        } else if (ret == 0) {
            ret = -1;
            break;
        } else {
            if (ch == '\r') {
                ret = 0;
                break;
            }
            if (i < (buf_size - 1))
                buf[i++] = ch;
        }
    }
    term_exit();
    buf[i] = '\0';
    printf("\n");
    return ret;
}
#endif

static BlockDriverState *bdrv_new_open(const char *filename,
                                       const char *fmt)
{
    BlockDriverState *bs;
    BlockDriver *drv;
    char password[256];

    bs = bdrv_new("");
    if (!bs)
        error("Not enough memory");
    if (fmt) {
        drv = bdrv_find_format(fmt);
        if (!drv)
            error("Unknown file format '%s'", fmt);
    } else {
        drv = NULL;
    }
    if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
        error("Could not open '%s'", filename);
    }
    if (bdrv_is_encrypted(bs)) {
        printf("Disk image '%s' is encrypted.\n", filename);
        if (read_password(password, sizeof(password)) < 0)
            error("No password given");
        if (bdrv_set_key(bs, password) < 0)
            error("invalid password");
    }
    return bs;
}

static int img_create(int argc, char **argv)
{
    int c, ret, flags;
    const char *fmt = "raw";
    const char *base_fmt = NULL;
    const char *filename;
    const char *base_filename = NULL;
    uint64_t size;
    double sizef;
    const char *p;
    BlockDriver *drv;

    flags = 0;
    for(;;) {
        c = getopt(argc, argv, "F:b:f:he6");
        if (c == -1)
            break;
        switch(c) {
        case 'h':
            help();
            break;
        case 'F':
            base_fmt = optarg;
            break;
        case 'b':
            base_filename = optarg;
            break;
        case 'f':
            fmt = optarg;
            break;
        case 'e':
            flags |= BLOCK_FLAG_ENCRYPT;
            break;
        case '6':
            flags |= BLOCK_FLAG_COMPAT6;
            break;
        }
    }
    if (optind >= argc)
        help();
    filename = argv[optind++];
    size = 0;
    if (base_filename) {
        BlockDriverState *bs;
        BlockDriver *base_drv = NULL;

        if (base_fmt) {
            base_drv = bdrv_find_format(base_fmt);
            if (base_drv == NULL)
                error("Unknown basefile format '%s'", base_fmt);
        }

        bs = bdrv_new_open(base_filename, base_fmt);
        bdrv_get_geometry(bs, &size);
        size *= 512;
        bdrv_delete(bs);
    } else {
        if (optind >= argc)
            help();
        p = argv[optind];
        sizef = strtod(p, (char **)&p);
        if (*p == 'M') {
            size = (uint64_t)(sizef * 1024 * 1024);
        } else if (*p == 'G') {
            size = (uint64_t)(sizef * 1024 * 1024 * 1024);
        } else if (*p == 'k' || *p == 'K' || *p == '\0') {
            size = (uint64_t)(sizef * 1024);
        } else {
            help();
        }
    }
    drv = bdrv_find_format(fmt);
    if (!drv)
        error("Unknown file format '%s'", fmt);
    printf("Formatting '%s', fmt=%s",
           filename, fmt);
    if (flags & BLOCK_FLAG_ENCRYPT)
        printf(", encrypted");
    if (flags & BLOCK_FLAG_COMPAT6)
        printf(", compatibility level=6");
    if (base_filename) {
        printf(", backing_file=%s",
               base_filename);
         if (base_fmt)
             printf(", backing_fmt=%s",
                    base_fmt);
    }
    printf(", size=%" PRIu64 " kB\n", size / 1024);
    ret = bdrv_create2(drv, filename, size / 512, base_filename, base_fmt, flags);
    if (ret < 0) {
        if (ret == -ENOTSUP) {
            error("Formatting or formatting option not supported for file format '%s'", fmt);
        } else if (ret == -EFBIG) {
            error("The image size is too large for file format '%s'", fmt);
        } else {
            error("Error while formatting");
        }
    }
    return 0;
}

static int img_check(int argc, char **argv)
{
    int c, ret;
    const char *filename, *fmt;
    BlockDriver *drv;
    BlockDriverState *bs;

    fmt = NULL;
    for(;;) {
        c = getopt(argc, argv, "f:h");
        if (c == -1)
            break;
        switch(c) {
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        }
    }
    if (optind >= argc)
        help();
    filename = argv[optind++];

    bs = bdrv_new("");
    if (!bs)
        error("Not enough memory");
    if (fmt) {
        drv = bdrv_find_format(fmt);
        if (!drv)
            error("Unknown file format '%s'", fmt);
    } else {
        drv = NULL;
    }
    if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
        error("Could not open '%s'", filename);
    }
    ret = bdrv_check(bs);
    switch(ret) {
    case 0:
        printf("No errors were found on the image.\n");
        break;
    case -ENOTSUP:
        error("This image format does not support checks");
        break;
    default:
        if (ret < 0) {
            error("An error occurred during the check");
        } else {
            printf("%d errors were found on the image.\n", ret);
        }
        break;
    }

    bdrv_delete(bs);
    return 0;
}

static int img_commit(int argc, char **argv)
{
    int c, ret;
    const char *filename, *fmt;
    BlockDriver *drv;
    BlockDriverState *bs;

    fmt = NULL;
    for(;;) {
        c = getopt(argc, argv, "f:h");
        if (c == -1)
            break;
        switch(c) {
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        }
    }
    if (optind >= argc)
        help();
    filename = argv[optind++];

    bs = bdrv_new("");
    if (!bs)
        error("Not enough memory");
    if (fmt) {
        drv = bdrv_find_format(fmt);
        if (!drv)
            error("Unknown file format '%s'", fmt);
    } else {
        drv = NULL;
    }
    if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
        error("Could not open '%s'", filename);
    }
    ret = bdrv_commit(bs);
    switch(ret) {
    case 0:
        printf("Image committed.\n");
        break;
    case -ENOENT:
        error("No disk inserted");
        break;
    case -EACCES:
        error("Image is read-only");
        break;
    case -ENOTSUP:
        error("Image is already committed");
        break;
    default:
        error("Error while committing image");
        break;
    }

    bdrv_delete(bs);
    return 0;
}

static int is_not_zero(const uint8_t *sector, int len)
{
    int i;
    len >>= 2;
    for(i = 0;i < len; i++) {
        if (((uint32_t *)sector)[i] != 0)
            return 1;
    }
    return 0;
}

/*
 * Returns true iff the first sector pointed to by 'buf' contains at least
 * a non-NUL byte.
 *
 * 'pnum' is set to the number of sectors (including and immediately following
 * the first one) that are known to be in the same allocated/unallocated state.
 */
static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
{
    int v, i;

    if (n <= 0) {
        *pnum = 0;
        return 0;
    }
    v = is_not_zero(buf, 512);
    for(i = 1; i < n; i++) {
        buf += 512;
        if (v != is_not_zero(buf, 512))
            break;
    }
    *pnum = i;
    return v;
}

#define IO_BUF_SIZE 65536

static int img_convert(int argc, char **argv)
{
    int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
    const char *fmt, *out_fmt, *out_baseimg, *out_filename;
    BlockDriver *drv;
    BlockDriverState **bs, *out_bs;
    int64_t total_sectors, nb_sectors, sector_num, bs_offset;
    uint64_t bs_sectors;
    uint8_t buf[IO_BUF_SIZE];
    const uint8_t *buf1;
    BlockDriverInfo bdi;

    fmt = NULL;
    out_fmt = "raw";
    out_baseimg = NULL;
    flags = 0;
    for(;;) {
        c = getopt(argc, argv, "f:O:B:hce6");
        if (c == -1)
            break;
        switch(c) {
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        case 'O':
            out_fmt = optarg;
            break;
        case 'B':
            out_baseimg = optarg;
            break;
        case 'c':
            flags |= BLOCK_FLAG_COMPRESS;
            break;
        case 'e':
            flags |= BLOCK_FLAG_ENCRYPT;
            break;
        case '6':
            flags |= BLOCK_FLAG_COMPAT6;
            break;
        }
    }

    bs_n = argc - optind - 1;
    if (bs_n < 1) help();

    out_filename = argv[argc - 1];

    if (bs_n > 1 && out_baseimg)
        error("-B makes no sense when concatenating multiple input images");
        
    bs = calloc(bs_n, sizeof(BlockDriverState *));
    if (!bs)
        error("Out of memory");

    total_sectors = 0;
    for (bs_i = 0; bs_i < bs_n; bs_i++) {
        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);
        if (!bs[bs_i])
            error("Could not open '%s'", argv[optind + bs_i]);
        bdrv_get_geometry(bs[bs_i], &bs_sectors);
        total_sectors += bs_sectors;
    }

    drv = bdrv_find_format(out_fmt);
    if (!drv)
        error("Unknown file format '%s'", out_fmt);
    if (flags & BLOCK_FLAG_COMPRESS && strcmp(drv->format_name, "qcow") && strcmp(drv->format_name, "qcow2"))
        error("Compression not supported for this file format");
    if (flags & BLOCK_FLAG_ENCRYPT && strcmp(drv->format_name, "qcow") && strcmp(drv->format_name, "qcow2"))
        error("Encryption not supported for this file format");
    if (flags & BLOCK_FLAG_COMPAT6 && strcmp(drv->format_name, "vmdk"))
        error("Alternative compatibility level not supported for this file format");
    if (flags & BLOCK_FLAG_ENCRYPT && flags & BLOCK_FLAG_COMPRESS)
        error("Compression and encryption not supported at the same time");

    ret = bdrv_create(drv, out_filename, total_sectors, out_baseimg, flags);
    if (ret < 0) {
        if (ret == -ENOTSUP) {
            error("Formatting not supported for file format '%s'", out_fmt);
        } else if (ret == -EFBIG) {
            error("The image size is too large for file format '%s'", out_fmt);
        } else {
            error("Error while formatting '%s'", out_filename);
        }
    }

    out_bs = bdrv_new_open(out_filename, out_fmt);

    bs_i = 0;
    bs_offset = 0;
    bdrv_get_geometry(bs[0], &bs_sectors);

    if (flags & BLOCK_FLAG_COMPRESS) {
        if (bdrv_get_info(out_bs, &bdi) < 0)
            error("could not get block driver info");
        cluster_size = bdi.cluster_size;
        if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
            error("invalid cluster size");
        cluster_sectors = cluster_size >> 9;
        sector_num = 0;
        for(;;) {
            int64_t bs_num;
            int remainder;
            uint8_t *buf2;

            nb_sectors = total_sectors - sector_num;
            if (nb_sectors <= 0)
                break;
            if (nb_sectors >= cluster_sectors)
                n = cluster_sectors;
            else
                n = nb_sectors;

            bs_num = sector_num - bs_offset;
            assert (bs_num >= 0);
            remainder = n;
            buf2 = buf;
            while (remainder > 0) {
                int nlow;
                while (bs_num == bs_sectors) {
                    bs_i++;
                    assert (bs_i < bs_n);
                    bs_offset += bs_sectors;
                    bdrv_get_geometry(bs[bs_i], &bs_sectors);
                    bs_num = 0;
                    /* printf("changing part: sector_num=%lld, "
                       "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
                       sector_num, bs_i, bs_offset, bs_sectors); */
                }
                assert (bs_num < bs_sectors);

                nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;

                if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0) 
                    error("error while reading");

                buf2 += nlow * 512;
                bs_num += nlow;

                remainder -= nlow;
            }
            assert (remainder == 0);

            if (n < cluster_sectors)
                memset(buf + n * 512, 0, cluster_size - n * 512);
            if (is_not_zero(buf, cluster_size)) {
                if (bdrv_write_compressed(out_bs, sector_num, buf,
                                          cluster_sectors) != 0)
                    error("error while compressing sector %" PRId64,
                          sector_num);
            }
            sector_num += n;
        }
        /* signal EOF to align */
        bdrv_write_compressed(out_bs, 0, NULL, 0);
    } else {
        sector_num = 0; // total number of sectors converted so far
        for(;;) {
            nb_sectors = total_sectors - sector_num;
            if (nb_sectors <= 0)
                break;
            if (nb_sectors >= (IO_BUF_SIZE / 512))
                n = (IO_BUF_SIZE / 512);
            else
                n = nb_sectors;

            while (sector_num - bs_offset >= bs_sectors) {
                bs_i ++;
                assert (bs_i < bs_n);
                bs_offset += bs_sectors;
                bdrv_get_geometry(bs[bs_i], &bs_sectors);
                /* printf("changing part: sector_num=%lld, bs_i=%d, "
                  "bs_offset=%lld, bs_sectors=%lld\n",
                   sector_num, bs_i, bs_offset, bs_sectors); */
            }

            if (n > bs_offset + bs_sectors - sector_num)
                n = bs_offset + bs_sectors - sector_num;

            if (strcmp(drv->format_name, "host_device")) {
                if (!bdrv_is_allocated(bs[bs_i], sector_num - bs_offset,
                                       n, &n1)) {
                    sector_num += n1;
                    continue;
                }
                /* The next 'n1' sectors are allocated in the input image. Copy
                   only those as they may be followed by unallocated sectors. */
                n = n1;
            } else {
                n1 = n;
            }

            if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0) 
                error("error while reading");
            /* NOTE: at the same time we convert, we do not write zero
               sectors to have a chance to compress the image. Ideally, we
               should add a specific call to have the info to go faster */
            buf1 = buf;
            while (n > 0) {
                /* If the output image is being created as a copy on write image,
                   copy all sectors even the ones containing only NUL bytes,
                   because they may differ from the sectors in the base image.

                   If the output is to a host device, we also write out
                   sectors that are entirely 0, since whatever data was
                   already there is garbage, not 0s. */
                if (strcmp(drv->format_name, "host_device") == 0 || out_baseimg ||
                    is_allocated_sectors(buf1, n, &n1)) {
                    if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
                        error("error while writing");
                }
                sector_num += n1;
                n -= n1;
                buf1 += n1 * 512;
            }
        }
    }
    bdrv_delete(out_bs);
    for (bs_i = 0; bs_i < bs_n; bs_i++)
        bdrv_delete(bs[bs_i]);
    free(bs);
    return 0;
}

#ifdef _WIN32
static int64_t get_allocated_file_size(const char *filename)
{
    typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
    get_compressed_t get_compressed;
    struct _stati64 st;

    /* WinNT support GetCompressedFileSize to determine allocate size */
    get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");
    if (get_compressed) {
    	DWORD high, low;
    	low = get_compressed(filename, &high);
    	if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)
	    return (((int64_t) high) << 32) + low;
    }

    if (_stati64(filename, &st) < 0)
        return -1;
    return st.st_size;
}
#else
static int64_t get_allocated_file_size(const char *filename)
{
    struct stat st;
    if (stat(filename, &st) < 0)
        return -1;
    return (int64_t)st.st_blocks * 512;
}
#endif

static void dump_snapshots(BlockDriverState *bs)
{
    QEMUSnapshotInfo *sn_tab, *sn;
    int nb_sns, i;
    char buf[256];

    nb_sns = bdrv_snapshot_list(bs, &sn_tab);
    if (nb_sns <= 0)
        return;
    printf("Snapshot list:\n");
    printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
    for(i = 0; i < nb_sns; i++) {
        sn = &sn_tab[i];
        printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
    }
    qemu_free(sn_tab);
}

static int img_info(int argc, char **argv)
{
    int c;
    const char *filename, *fmt;
    BlockDriver *drv;
    BlockDriverState *bs;
    char fmt_name[128], size_buf[128], dsize_buf[128];
    uint64_t total_sectors;
    int64_t allocated_size;
    char backing_filename[1024];
    char backing_filename2[1024];
    BlockDriverInfo bdi;

    fmt = NULL;
    for(;;) {
        c = getopt(argc, argv, "f:h");
        if (c == -1)
            break;
        switch(c) {
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        }
    }
    if (optind >= argc)
        help();
    filename = argv[optind++];

    bs = bdrv_new("");
    if (!bs)
        error("Not enough memory");
    if (fmt) {
        drv = bdrv_find_format(fmt);
        if (!drv)
            error("Unknown file format '%s'", fmt);
    } else {
        drv = NULL;
    }
    if (bdrv_open2(bs, filename, BRDV_O_FLAGS, drv) < 0) {
        error("Could not open '%s'", filename);
    }
    bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
    bdrv_get_geometry(bs, &total_sectors);
    get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
    allocated_size = get_allocated_file_size(filename);
    if (allocated_size < 0)
        snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
    else
        get_human_readable_size(dsize_buf, sizeof(dsize_buf),
                                allocated_size);
    printf("image: %s\n"
           "file format: %s\n"
           "virtual size: %s (%" PRId64 " bytes)\n"
           "disk size: %s\n",
           filename, fmt_name, size_buf,
           (total_sectors * 512),
           dsize_buf);
    if (bdrv_is_encrypted(bs))
        printf("encrypted: yes\n");
    if (bdrv_get_info(bs, &bdi) >= 0) {
        if (bdi.cluster_size != 0)
            printf("cluster_size: %d\n", bdi.cluster_size);
    }
    bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
    if (backing_filename[0] != '\0') {
        path_combine(backing_filename2, sizeof(backing_filename2),
                     filename, backing_filename);
        printf("backing file: %s (actual path: %s)\n",
               backing_filename,
               backing_filename2);
    }
    dump_snapshots(bs);
    bdrv_delete(bs);
    return 0;
}

#define SNAPSHOT_LIST   1
#define SNAPSHOT_CREATE 2
#define SNAPSHOT_APPLY  3
#define SNAPSHOT_DELETE 4

static void img_snapshot(int argc, char **argv)
{
    BlockDriverState *bs;
    QEMUSnapshotInfo sn;
    char *filename, *snapshot_name = NULL;
    int c, ret;
    int action = 0;
    qemu_timeval tv;

    /* Parse commandline parameters */
    for(;;) {
        c = getopt(argc, argv, "la:c:d:h");
        if (c == -1)
            break;
        switch(c) {
        case 'h':
            help();
            return;
        case 'l':
            if (action) {
                help();
                return;
            }
            action = SNAPSHOT_LIST;
            break;
        case 'a':
            if (action) {
                help();
                return;
            }
            action = SNAPSHOT_APPLY;
            snapshot_name = optarg;
            break;
        case 'c':
            if (action) {
                help();
                return;
            }
            action = SNAPSHOT_CREATE;
            snapshot_name = optarg;
            break;
        case 'd':
            if (action) {
                help();
                return;
            }
            action = SNAPSHOT_DELETE;
            snapshot_name = optarg;
            break;
        }
    }

    if (optind >= argc)
        help();
    filename = argv[optind++];

    /* Open the image */
    bs = bdrv_new("");
    if (!bs)
        error("Not enough memory");

    if (bdrv_open2(bs, filename, 0, NULL) < 0) {
        error("Could not open '%s'", filename);
    }

    /* Perform the requested action */
    switch(action) {
    case SNAPSHOT_LIST:
        dump_snapshots(bs);
        break;

    case SNAPSHOT_CREATE:
        memset(&sn, 0, sizeof(sn));
        pstrcpy(sn.name, sizeof(sn.name), snapshot_name);

        qemu_gettimeofday(&tv);
        sn.date_sec = tv.tv_sec;
        sn.date_nsec = tv.tv_usec * 1000;

        ret = bdrv_snapshot_create(bs, &sn);
        if (ret)
            error("Could not create snapshot '%s': %d (%s)",
                snapshot_name, ret, strerror(-ret));
        break;

    case SNAPSHOT_APPLY:
        ret = bdrv_snapshot_goto(bs, snapshot_name);
        if (ret)
            error("Could not apply snapshot '%s': %d (%s)",
                snapshot_name, ret, strerror(-ret));
        break;

    case SNAPSHOT_DELETE:
        ret = bdrv_snapshot_delete(bs, snapshot_name);
        if (ret)
            error("Could not delete snapshot '%s': %d (%s)",
                snapshot_name, ret, strerror(-ret));
        break;
    }

    /* Cleanup */
    bdrv_delete(bs);
}

int main(int argc, char **argv)
{
    const char *cmd;

    bdrv_init();
    if (argc < 2)
        help();
    cmd = argv[1];
    argc--; argv++;
    if (!strcmp(cmd, "create")) {
        img_create(argc, argv);
    } else if (!strcmp(cmd, "check")) {
        img_check(argc, argv);
    } else if (!strcmp(cmd, "commit")) {
        img_commit(argc, argv);
    } else if (!strcmp(cmd, "convert")) {
        img_convert(argc, argv);
    } else if (!strcmp(cmd, "info")) {
        img_info(argc, argv);
    } else if (!strcmp(cmd, "snapshot")) {
        img_snapshot(argc, argv);
    } else {
        help();
    }
    return 0;
}
OpenPOWER on IntegriCloud