qemu-img.c 42.8 KB
Newer Older
B
bellard 已提交
1
/*
B
bellard 已提交
2
 * QEMU disk image utility
3
 *
B
bellard 已提交
4
 * Copyright (c) 2003-2008 Fabrice Bellard
5
 *
B
bellard 已提交
6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23
 * 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.
 */
P
pbrook 已提交
24
#include "qemu-common.h"
25
#include "qemu-option.h"
K
Kevin Wolf 已提交
26
#include "qemu-error.h"
27
#include "osdep.h"
28
#include "sysemu.h"
29
#include "block_int.h"
30
#include <stdio.h>
B
bellard 已提交
31

32 33 34 35
#ifdef _WIN32
#include <windows.h>
#endif

A
Anthony Liguori 已提交
36
typedef struct img_cmd_t {
37 38
    const char *name;
    int (*handler)(int argc, char **argv);
A
Anthony Liguori 已提交
39
} img_cmd_t;
40

41
/* Default to cache=writeback as data integrity is not important for qemu-tcg. */
42
#define BDRV_O_FLAGS BDRV_O_CACHE_WB
43

B
bellard 已提交
44 45 46 47 48
static void format_print(void *opaque, const char *name)
{
    printf(" %s", name);
}

B
blueswir1 已提交
49
/* Please keep in synch with qemu-img.texi */
P
pbrook 已提交
50
static void help(void)
B
bellard 已提交
51
{
52 53
    const char *help_msg =
           "qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
54 55 56 57
           "usage: qemu-img command [command options]\n"
           "QEMU disk image utility\n"
           "\n"
           "Command syntax:\n"
58 59 60 61 62
#define DEF(option, callback, arg_string)        \
           "  " arg_string "\n"
#include "qemu-img-cmds.h"
#undef DEF
#undef GEN_DOCS
63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79
           "\n"
           "Command parameters:\n"
           "  'filename' is a disk image filename\n"
           "  'fmt' is the disk image format. It is guessed automatically in most cases\n"
           "  'size' is the disk image size in bytes. Optional suffixes\n"
           "    'k' or 'K' (kilobyte, 1024), 'M' (megabyte, 1024k), 'G' (gigabyte, 1024M)\n"
           "    and T (terabyte, 1024G) are supported. 'b' is ignored.\n"
           "  'output_filename' is the destination disk image filename\n"
           "  'output_fmt' is the destination format\n"
           "  'options' is a comma separated list of format specific options in a\n"
           "    name=value format. Use -o ? for an overview of the options supported by the\n"
           "    used format\n"
           "  '-c' indicates that target image must be compressed (qcow format only)\n"
           "  '-u' enables unsafe rebasing. It is assumed that old and new backing file\n"
           "       match exactly. The image doesn't need a working backing file before\n"
           "       rebasing in this case (useful for renaming the backing file)\n"
           "  '-h' with or without a command shows this help and lists the supported formats\n"
80
           "  '-p' show progress of command (only certain commands)\n"
81 82 83 84 85 86
           "\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"
87 88 89
           "  '-l' lists all snapshots in the given image\n";

    printf("%s\nSupported formats:", help_msg);
B
bellard 已提交
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
    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;
140

B
bellard 已提交
141 142 143 144 145
    tcsetattr (0, TCSANOW, &tty);

    atexit(term_exit);
}

P
pbrook 已提交
146
static int read_password(char *buf, int buf_size)
B
bellard 已提交
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
{
    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

183 184 185 186 187 188 189 190
static int print_block_option_help(const char *filename, const char *fmt)
{
    BlockDriver *drv, *proto_drv;
    QEMUOptionParameter *create_options = NULL;

    /* Find driver and parse its options */
    drv = bdrv_find_format(fmt);
    if (!drv) {
191
        error_report("Unknown file format '%s'", fmt);
192 193 194 195 196
        return 1;
    }

    proto_drv = bdrv_find_protocol(filename);
    if (!proto_drv) {
197
        error_report("Unknown protocol '%s'", filename);
198 199 200 201 202 203 204 205 206 207 208 209
        return 1;
    }

    create_options = append_option_parameters(create_options,
                                              drv->create_options);
    create_options = append_option_parameters(create_options,
                                              proto_drv->create_options);
    print_option_help(create_options);
    free_option_parameters(create_options);
    return 0;
}

210
static BlockDriverState *bdrv_new_open(const char *filename,
211
                                       const char *fmt,
212
                                       int flags)
213 214 215 216
{
    BlockDriverState *bs;
    BlockDriver *drv;
    char password[256];
217
    int ret;
218

219
    bs = bdrv_new("image");
220

221 222
    if (fmt) {
        drv = bdrv_find_format(fmt);
223
        if (!drv) {
224
            error_report("Unknown file format '%s'", fmt);
225 226
            goto fail;
        }
227 228 229
    } else {
        drv = NULL;
    }
230 231 232 233

    ret = bdrv_open(bs, filename, flags, drv);
    if (ret < 0) {
        error_report("Could not open '%s': %s", filename, strerror(-ret));
234
        goto fail;
235
    }
236

237 238
    if (bdrv_is_encrypted(bs)) {
        printf("Disk image '%s' is encrypted.\n", filename);
239
        if (read_password(password, sizeof(password)) < 0) {
240
            error_report("No password given");
241 242 243
            goto fail;
        }
        if (bdrv_set_key(bs, password) < 0) {
244
            error_report("invalid password");
245 246
            goto fail;
        }
247 248
    }
    return bs;
249 250 251 252 253
fail:
    if (bs) {
        bdrv_delete(bs);
    }
    return NULL;
254 255
}

256
static int add_old_style_options(const char *fmt, QEMUOptionParameter *list,
257 258
                                 const char *base_filename,
                                 const char *base_fmt)
259 260 261
{
    if (base_filename) {
        if (set_option_parameter(list, BLOCK_OPT_BACKING_FILE, base_filename)) {
262 263
            error_report("Backing file not supported for file format '%s'",
                         fmt);
264
            return -1;
265 266 267 268
        }
    }
    if (base_fmt) {
        if (set_option_parameter(list, BLOCK_OPT_BACKING_FMT, base_fmt)) {
269 270
            error_report("Backing file format not supported for file "
                         "format '%s'", fmt);
271
            return -1;
272 273
        }
    }
274
    return 0;
275 276
}

B
bellard 已提交
277 278
static int img_create(int argc, char **argv)
{
279
    int c, ret = 0;
280
    uint64_t img_size = -1;
B
bellard 已提交
281
    const char *fmt = "raw";
282
    const char *base_fmt = NULL;
B
bellard 已提交
283 284
    const char *filename;
    const char *base_filename = NULL;
285
    char *options = NULL;
286

B
bellard 已提交
287
    for(;;) {
288
        c = getopt(argc, argv, "F:b:f:he6o:");
289
        if (c == -1) {
B
bellard 已提交
290
            break;
291
        }
B
bellard 已提交
292
        switch(c) {
J
Jes Sorensen 已提交
293
        case '?':
B
bellard 已提交
294 295 296
        case 'h':
            help();
            break;
297 298 299
        case 'F':
            base_fmt = optarg;
            break;
B
bellard 已提交
300 301 302 303 304 305 306
        case 'b':
            base_filename = optarg;
            break;
        case 'f':
            fmt = optarg;
            break;
        case 'e':
307
            error_report("qemu-img: option -e is deprecated, please use \'-o "
308 309
                  "encryption\' instead!");
            return 1;
310
        case '6':
311
            error_report("qemu-img: option -6 is deprecated, please use \'-o "
312 313
                  "compat6\' instead!");
            return 1;
314 315 316
        case 'o':
            options = optarg;
            break;
B
bellard 已提交
317 318
        }
    }
319

320
    /* Get the filename */
321
    if (optind >= argc) {
322
        help();
323
    }
324 325
    filename = argv[optind++];

326 327
    /* Get image size, if specified */
    if (optind < argc) {
328
        int64_t sval;
329 330
        sval = strtosz_suffix(argv[optind++], NULL, STRTOSZ_DEFSUFFIX_B);
        if (sval < 0) {
331
            error_report("Invalid image size specified! You may use k, M, G or "
332
                  "T suffixes for ");
333
            error_report("kilobytes, megabytes, gigabytes and terabytes.");
334 335 336 337 338 339
            ret = -1;
            goto out;
        }
        img_size = (uint64_t)sval;
    }

340 341 342 343 344
    if (options && !strcmp(options, "?")) {
        ret = print_block_option_help(filename, fmt);
        goto out;
    }

J
Jes Sorensen 已提交
345 346
    ret = bdrv_img_create(filename, fmt, base_filename, base_fmt,
                          options, img_size, BDRV_O_FLAGS);
347 348 349 350
out:
    if (ret) {
        return 1;
    }
B
bellard 已提交
351 352 353
    return 0;
}

354 355 356 357 358 359 360 361
/*
 * Checks an image for consistency. Exit codes:
 *
 * 0 - Check completed, image is good
 * 1 - Check not completed because of internal errors
 * 2 - Check completed, image is corrupted
 * 3 - Check completed, image has leaked clusters, but is good otherwise
 */
362 363 364 365 366
static int img_check(int argc, char **argv)
{
    int c, ret;
    const char *filename, *fmt;
    BlockDriverState *bs;
367
    BdrvCheckResult result;
368 369 370 371

    fmt = NULL;
    for(;;) {
        c = getopt(argc, argv, "f:h");
372
        if (c == -1) {
373
            break;
374
        }
375
        switch(c) {
J
Jes Sorensen 已提交
376
        case '?':
377 378 379 380 381 382 383 384
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        }
    }
385
    if (optind >= argc) {
386
        help();
387
    }
388 389
    filename = argv[optind++];

390
    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS);
391 392 393
    if (!bs) {
        return 1;
    }
394 395 396
    ret = bdrv_check(bs, &result);

    if (ret == -ENOTSUP) {
397
        error_report("This image format does not support checks");
398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420
        bdrv_delete(bs);
        return 1;
    }

    if (!(result.corruptions || result.leaks || result.check_errors)) {
        printf("No errors were found on the image.\n");
    } else {
        if (result.corruptions) {
            printf("\n%d errors were found on the image.\n"
                "Data may be corrupted, or further writes to the image "
                "may corrupt it.\n",
                result.corruptions);
        }

        if (result.leaks) {
            printf("\n%d leaked clusters were found on the image.\n"
                "This means waste of disk space, but no harm to data.\n",
                result.leaks);
        }

        if (result.check_errors) {
            printf("\n%d internal errors have occurred during the check.\n",
                result.check_errors);
421 422 423 424
        }
    }

    bdrv_delete(bs);
425 426 427 428 429

    if (ret < 0 || result.check_errors) {
        printf("\nAn error has occurred during the check: %s\n"
            "The check is not complete and may have missed error.\n",
            strerror(-ret));
430 431
        return 1;
    }
432 433 434 435 436 437 438 439

    if (result.corruptions) {
        return 2;
    } else if (result.leaks) {
        return 3;
    } else {
        return 0;
    }
440 441
}

B
bellard 已提交
442 443 444 445 446 447 448 449 450
static int img_commit(int argc, char **argv)
{
    int c, ret;
    const char *filename, *fmt;
    BlockDriverState *bs;

    fmt = NULL;
    for(;;) {
        c = getopt(argc, argv, "f:h");
451
        if (c == -1) {
B
bellard 已提交
452
            break;
453
        }
B
bellard 已提交
454
        switch(c) {
J
Jes Sorensen 已提交
455
        case '?':
B
bellard 已提交
456 457 458 459 460 461 462 463
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        }
    }
464
    if (optind >= argc) {
B
bellard 已提交
465
        help();
466
    }
B
bellard 已提交
467 468
    filename = argv[optind++];

469
    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
470 471 472
    if (!bs) {
        return 1;
    }
B
bellard 已提交
473 474 475 476 477 478
    ret = bdrv_commit(bs);
    switch(ret) {
    case 0:
        printf("Image committed.\n");
        break;
    case -ENOENT:
479
        error_report("No disk inserted");
B
bellard 已提交
480 481
        break;
    case -EACCES:
482
        error_report("Image is read-only");
B
bellard 已提交
483 484
        break;
    case -ENOTSUP:
485
        error_report("Image is already committed");
B
bellard 已提交
486 487
        break;
    default:
488
        error_report("Error while committing image");
B
bellard 已提交
489 490 491 492
        break;
    }

    bdrv_delete(bs);
493 494 495
    if (ret) {
        return 1;
    }
B
bellard 已提交
496 497 498 499 500 501 502 503 504 505 506 507 508 509
    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;
}

510 511 512 513 514 515 516
/*
 * 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.
 */
B
bellard 已提交
517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534
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;
}

K
Kevin Wolf 已提交
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
/*
 * Compares two buffers sector by sector. Returns 0 if the first sector of both
 * buffers matches, non-zero otherwise.
 *
 * pnum is set to the number of sectors (including and immediately following
 * the first one) that are known to have the same comparison result
 */
static int compare_sectors(const uint8_t *buf1, const uint8_t *buf2, int n,
    int *pnum)
{
    int res, i;

    if (n <= 0) {
        *pnum = 0;
        return 0;
    }

    res = !!memcmp(buf1, buf2, 512);
    for(i = 1; i < n; i++) {
        buf1 += 512;
        buf2 += 512;

        if (!!memcmp(buf1, buf2, 512) != res) {
            break;
        }
    }

    *pnum = i;
    return res;
}

566
#define IO_BUF_SIZE (2 * 1024 * 1024)
B
bellard 已提交
567 568 569

static int img_convert(int argc, char **argv)
{
570
    int c, ret = 0, n, n1, bs_n, bs_i, compress, cluster_size, cluster_sectors;
571
    int progress = 0;
572
    const char *fmt, *out_fmt, *out_baseimg, *out_filename;
573
    BlockDriver *drv, *proto_drv;
574
    BlockDriverState **bs = NULL, *out_bs = NULL;
575 576
    int64_t total_sectors, nb_sectors, sector_num, bs_offset;
    uint64_t bs_sectors;
577
    uint8_t * buf = NULL;
B
bellard 已提交
578
    const uint8_t *buf1;
B
bellard 已提交
579
    BlockDriverInfo bdi;
580
    QEMUOptionParameter *param = NULL, *create_options = NULL;
581
    QEMUOptionParameter *out_baseimg_param;
582
    char *options = NULL;
E
edison 已提交
583
    const char *snapshot_name = NULL;
584
    float local_progress;
B
bellard 已提交
585 586 587

    fmt = NULL;
    out_fmt = "raw";
588
    out_baseimg = NULL;
589
    compress = 0;
B
bellard 已提交
590
    for(;;) {
591
        c = getopt(argc, argv, "f:O:B:s:hce6o:p");
592
        if (c == -1) {
B
bellard 已提交
593
            break;
594
        }
B
bellard 已提交
595
        switch(c) {
J
Jes Sorensen 已提交
596
        case '?':
B
bellard 已提交
597 598 599 600 601 602 603 604 605
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        case 'O':
            out_fmt = optarg;
            break;
606 607 608
        case 'B':
            out_baseimg = optarg;
            break;
B
bellard 已提交
609
        case 'c':
610
            compress = 1;
B
bellard 已提交
611 612
            break;
        case 'e':
613
            error_report("qemu-img: option -e is deprecated, please use \'-o "
614 615
                  "encryption\' instead!");
            return 1;
616
        case '6':
617
            error_report("qemu-img: option -6 is deprecated, please use \'-o "
618 619
                  "compat6\' instead!");
            return 1;
620 621 622
        case 'o':
            options = optarg;
            break;
E
edison 已提交
623 624 625
        case 's':
            snapshot_name = optarg;
            break;
626 627 628
        case 'p':
            progress = 1;
            break;
B
bellard 已提交
629 630
        }
    }
631

632
    bs_n = argc - optind - 1;
633 634 635
    if (bs_n < 1) {
        help();
    }
636 637

    out_filename = argv[argc - 1];
638

639 640 641 642 643
    if (options && !strcmp(options, "?")) {
        ret = print_block_option_help(out_filename, out_fmt);
        goto out;
    }

644
    if (bs_n > 1 && out_baseimg) {
645 646
        error_report("-B makes no sense when concatenating multiple input "
                     "images");
647 648
        ret = -1;
        goto out;
649
    }
650
        
651 652 653
    qemu_progress_init(progress, 2.0);
    qemu_progress_print(0, 100);

654
    bs = qemu_mallocz(bs_n * sizeof(BlockDriverState *));
655 656 657

    total_sectors = 0;
    for (bs_i = 0; bs_i < bs_n; bs_i++) {
658
        bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt, BDRV_O_FLAGS);
659
        if (!bs[bs_i]) {
660
            error_report("Could not open '%s'", argv[optind + bs_i]);
661 662 663
            ret = -1;
            goto out;
        }
664 665 666
        bdrv_get_geometry(bs[bs_i], &bs_sectors);
        total_sectors += bs_sectors;
    }
B
bellard 已提交
667

E
edison 已提交
668 669
    if (snapshot_name != NULL) {
        if (bs_n > 1) {
670
            error_report("No support for concatenating multiple snapshot\n");
E
edison 已提交
671 672 673 674
            ret = -1;
            goto out;
        }
        if (bdrv_snapshot_load_tmp(bs[0], snapshot_name) < 0) {
675
            error_report("Failed to load snapshot\n");
E
edison 已提交
676 677 678 679 680
            ret = -1;
            goto out;
        }
    }

681
    /* Find driver and parse its options */
B
bellard 已提交
682
    drv = bdrv_find_format(out_fmt);
683
    if (!drv) {
684
        error_report("Unknown file format '%s'", out_fmt);
685 686 687
        ret = -1;
        goto out;
    }
688

689
    proto_drv = bdrv_find_protocol(out_filename);
690
    if (!proto_drv) {
691
        error_report("Unknown protocol '%s'", out_filename);
692 693 694
        ret = -1;
        goto out;
    }
695 696 697 698 699

    create_options = append_option_parameters(create_options,
                                              drv->create_options);
    create_options = append_option_parameters(create_options,
                                              proto_drv->create_options);
700

701
    if (options) {
702
        param = parse_option_parameters(options, create_options, param);
703
        if (param == NULL) {
704
            error_report("Invalid options for file format '%s'.", out_fmt);
705 706
            ret = -1;
            goto out;
707 708
        }
    } else {
709
        param = parse_option_parameters("", create_options, param);
710 711 712
    }

    set_option_parameter_int(param, BLOCK_OPT_SIZE, total_sectors * 512);
713
    ret = add_old_style_options(out_fmt, param, out_baseimg, NULL);
714 715 716
    if (ret < 0) {
        goto out;
    }
717

718 719 720 721 722 723
    /* Get backing file name if -o backing_file was used */
    out_baseimg_param = get_option_parameter(param, BLOCK_OPT_BACKING_FILE);
    if (out_baseimg_param) {
        out_baseimg = out_baseimg_param->value.s;
    }

724
    /* Check if compression is supported */
725
    if (compress) {
726 727 728 729
        QEMUOptionParameter *encryption =
            get_option_parameter(param, BLOCK_OPT_ENCRYPT);

        if (!drv->bdrv_write_compressed) {
730
            error_report("Compression not supported for this file format");
731 732
            ret = -1;
            goto out;
733 734 735
        }

        if (encryption && encryption->value.n) {
736 737
            error_report("Compression and encryption not supported at "
                         "the same time");
738 739
            ret = -1;
            goto out;
740 741 742 743 744
        }
    }

    /* Create the new image */
    ret = bdrv_create(drv, out_filename, param);
B
bellard 已提交
745 746
    if (ret < 0) {
        if (ret == -ENOTSUP) {
747 748
            error_report("Formatting not supported for file format '%s'",
                         out_fmt);
749
        } else if (ret == -EFBIG) {
750 751
            error_report("The image size is too large for file format '%s'",
                         out_fmt);
B
bellard 已提交
752
        } else {
753 754
            error_report("%s: error while converting %s: %s",
                         out_filename, out_fmt, strerror(-ret));
B
bellard 已提交
755
        }
756
        goto out;
B
bellard 已提交
757
    }
758

759 760
    out_bs = bdrv_new_open(out_filename, out_fmt,
        BDRV_O_FLAGS | BDRV_O_RDWR | BDRV_O_NO_FLUSH);
761 762 763 764
    if (!out_bs) {
        ret = -1;
        goto out;
    }
B
bellard 已提交
765

766 767 768
    bs_i = 0;
    bs_offset = 0;
    bdrv_get_geometry(bs[0], &bs_sectors);
769
    buf = qemu_malloc(IO_BUF_SIZE);
770

771
    if (compress) {
772 773
        ret = bdrv_get_info(out_bs, &bdi);
        if (ret < 0) {
774
            error_report("could not get block driver info");
775 776
            goto out;
        }
B
bellard 已提交
777
        cluster_size = bdi.cluster_size;
778
        if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE) {
779
            error_report("invalid cluster size");
780 781 782
            ret = -1;
            goto out;
        }
B
bellard 已提交
783 784
        cluster_sectors = cluster_size >> 9;
        sector_num = 0;
785 786 787 788 789

        nb_sectors = total_sectors;
        local_progress = (float)100 /
            (nb_sectors / MIN(nb_sectors, (cluster_sectors)));

B
bellard 已提交
790
        for(;;) {
791 792 793 794
            int64_t bs_num;
            int remainder;
            uint8_t *buf2;

B
bellard 已提交
795 796 797 798 799 800 801
            nb_sectors = total_sectors - sector_num;
            if (nb_sectors <= 0)
                break;
            if (nb_sectors >= cluster_sectors)
                n = cluster_sectors;
            else
                n = nb_sectors;
802 803 804 805 806 807 808 809 810 811 812 813 814

            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;
B
Blue Swirl 已提交
815 816 817
                    /* printf("changing part: sector_num=%" PRId64 ", "
                       "bs_i=%d, bs_offset=%" PRId64 ", bs_sectors=%" PRId64
                       "\n", sector_num, bs_i, bs_offset, bs_sectors); */
818 819 820 821 822
                }
                assert (bs_num < bs_sectors);

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

823 824
                ret = bdrv_read(bs[bs_i], bs_num, buf2, nlow);
                if (ret < 0) {
825
                    error_report("error while reading");
826 827
                    goto out;
                }
828 829 830 831 832 833 834 835

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

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

836
            if (n < cluster_sectors) {
B
bellard 已提交
837
                memset(buf + n * 512, 0, cluster_size - n * 512);
838
            }
B
bellard 已提交
839
            if (is_not_zero(buf, cluster_size)) {
840 841 842
                ret = bdrv_write_compressed(out_bs, sector_num, buf,
                                            cluster_sectors);
                if (ret != 0) {
843
                    error_report("error while compressing sector %" PRId64,
844
                          sector_num);
845 846
                    goto out;
                }
B
bellard 已提交
847 848
            }
            sector_num += n;
849
            qemu_progress_print(local_progress, 100);
B
bellard 已提交
850
        }
B
bellard 已提交
851 852
        /* signal EOF to align */
        bdrv_write_compressed(out_bs, 0, NULL, 0);
B
bellard 已提交
853
    } else {
K
Kevin Wolf 已提交
854 855
        int has_zero_init = bdrv_has_zero_init(out_bs);

856
        sector_num = 0; // total number of sectors converted so far
857 858 859 860
        nb_sectors = total_sectors - sector_num;
        local_progress = (float)100 /
            (nb_sectors / MIN(nb_sectors, (IO_BUF_SIZE / 512)));

B
bellard 已提交
861 862
        for(;;) {
            nb_sectors = total_sectors - sector_num;
863
            if (nb_sectors <= 0) {
B
bellard 已提交
864
                break;
865 866
            }
            if (nb_sectors >= (IO_BUF_SIZE / 512)) {
B
bellard 已提交
867
                n = (IO_BUF_SIZE / 512);
868
            } else {
B
bellard 已提交
869
                n = nb_sectors;
870
            }
871 872 873 874 875 876

            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);
B
Blue Swirl 已提交
877 878
                /* printf("changing part: sector_num=%" PRId64 ", bs_i=%d, "
                  "bs_offset=%" PRId64 ", bs_sectors=%" PRId64 "\n",
879 880 881
                   sector_num, bs_i, bs_offset, bs_sectors); */
            }

882
            if (n > bs_offset + bs_sectors - sector_num) {
883
                n = bs_offset + bs_sectors - sector_num;
884
            }
885

K
Kevin Wolf 已提交
886
            if (has_zero_init) {
887 888 889 890 891 892 893 894 895 896 897 898 899
                /* If the output image is being created as a copy on write image,
                   assume that sectors which are unallocated in the input image
                   are present in both the output's and input's base images (no
                   need to copy them). */
                if (out_baseimg) {
                    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;
900 901 902
                }
            } else {
                n1 = n;
903 904
            }

905 906
            ret = bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n);
            if (ret < 0) {
907
                error_report("error while reading");
908 909
                goto out;
            }
B
bellard 已提交
910 911 912 913 914
            /* 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) {
915 916
                /* If the output image is being created as a copy on write image,
                   copy all sectors even the ones containing only NUL bytes,
917 918 919 920 921
                   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. */
K
Kevin Wolf 已提交
922
                if (!has_zero_init || out_baseimg ||
923
                    is_allocated_sectors(buf1, n, &n1)) {
924 925
                    ret = bdrv_write(out_bs, sector_num, buf1, n1);
                    if (ret < 0) {
926
                        error_report("error while writing");
927 928
                        goto out;
                    }
B
bellard 已提交
929 930 931 932 933
                }
                sector_num += n1;
                n -= n1;
                buf1 += n1 * 512;
            }
934
            qemu_progress_print(local_progress, 100);
B
bellard 已提交
935 936
        }
    }
937
out:
938
    qemu_progress_end();
939 940
    free_option_parameters(create_options);
    free_option_parameters(param);
941
    qemu_free(buf);
942 943 944
    if (out_bs) {
        bdrv_delete(out_bs);
    }
945 946 947 948 949
    if (bs) {
        for (bs_i = 0; bs_i < bs_n; bs_i++) {
            if (bs[bs_i]) {
                bdrv_delete(bs[bs_i]);
            }
950
        }
951
        qemu_free(bs);
952 953 954 955
    }
    if (ret) {
        return 1;
    }
B
bellard 已提交
956 957 958
    return 0;
}

B
bellard 已提交
959 960 961
#ifdef _WIN32
static int64_t get_allocated_file_size(const char *filename)
{
962 963
    typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
    get_compressed_t get_compressed;
B
bellard 已提交
964
    struct _stati64 st;
965 966 967 968 969 970 971 972 973 974

    /* 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;
    }

975
    if (_stati64(filename, &st) < 0)
B
bellard 已提交
976 977 978 979 980 981 982
        return -1;
    return st.st_size;
}
#else
static int64_t get_allocated_file_size(const char *filename)
{
    struct stat st;
983
    if (stat(filename, &st) < 0)
B
bellard 已提交
984 985 986 987 988
        return -1;
    return (int64_t)st.st_blocks * 512;
}
#endif

B
bellard 已提交
989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006
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);
}

B
bellard 已提交
1007 1008 1009 1010 1011 1012
static int img_info(int argc, char **argv)
{
    int c;
    const char *filename, *fmt;
    BlockDriverState *bs;
    char fmt_name[128], size_buf[128], dsize_buf[128];
1013 1014
    uint64_t total_sectors;
    int64_t allocated_size;
B
bellard 已提交
1015 1016
    char backing_filename[1024];
    char backing_filename2[1024];
B
bellard 已提交
1017
    BlockDriverInfo bdi;
B
bellard 已提交
1018 1019 1020 1021

    fmt = NULL;
    for(;;) {
        c = getopt(argc, argv, "f:h");
1022
        if (c == -1) {
B
bellard 已提交
1023
            break;
1024
        }
B
bellard 已提交
1025
        switch(c) {
J
Jes Sorensen 已提交
1026
        case '?':
B
bellard 已提交
1027 1028 1029 1030 1031 1032 1033 1034
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        }
    }
1035
    if (optind >= argc) {
B
bellard 已提交
1036
        help();
1037
    }
B
bellard 已提交
1038 1039
    filename = argv[optind++];

1040
    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_NO_BACKING);
1041 1042 1043
    if (!bs) {
        return 1;
    }
B
bellard 已提交
1044 1045 1046
    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);
B
bellard 已提交
1047
    allocated_size = get_allocated_file_size(filename);
1048
    if (allocated_size < 0) {
1049
        snprintf(dsize_buf, sizeof(dsize_buf), "unavailable");
1050
    } else {
1051
        get_human_readable_size(dsize_buf, sizeof(dsize_buf),
1052
                                allocated_size);
1053
    }
B
bellard 已提交
1054 1055
    printf("image: %s\n"
           "file format: %s\n"
1056
           "virtual size: %s (%" PRId64 " bytes)\n"
B
bellard 已提交
1057
           "disk size: %s\n",
1058
           filename, fmt_name, size_buf,
1059
           (total_sectors * 512),
B
bellard 已提交
1060
           dsize_buf);
1061
    if (bdrv_is_encrypted(bs)) {
B
bellard 已提交
1062
        printf("encrypted: yes\n");
1063
    }
B
bellard 已提交
1064
    if (bdrv_get_info(bs, &bdi) >= 0) {
1065
        if (bdi.cluster_size != 0) {
B
bellard 已提交
1066
            printf("cluster_size: %d\n", bdi.cluster_size);
1067
        }
B
bellard 已提交
1068
    }
B
bellard 已提交
1069
    bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
B
bellard 已提交
1070
    if (backing_filename[0] != '\0') {
B
bellard 已提交
1071 1072
        path_combine(backing_filename2, sizeof(backing_filename2),
                     filename, backing_filename);
1073
        printf("backing file: %s (actual path: %s)\n",
B
bellard 已提交
1074 1075
               backing_filename,
               backing_filename2);
B
bellard 已提交
1076 1077
    }
    dump_snapshots(bs);
B
bellard 已提交
1078 1079 1080 1081
    bdrv_delete(bs);
    return 0;
}

1082 1083 1084 1085 1086
#define SNAPSHOT_LIST   1
#define SNAPSHOT_CREATE 2
#define SNAPSHOT_APPLY  3
#define SNAPSHOT_DELETE 4

1087
static int img_snapshot(int argc, char **argv)
1088 1089 1090 1091
{
    BlockDriverState *bs;
    QEMUSnapshotInfo sn;
    char *filename, *snapshot_name = NULL;
1092
    int c, ret = 0, bdrv_oflags;
1093 1094 1095
    int action = 0;
    qemu_timeval tv;

1096
    bdrv_oflags = BDRV_O_FLAGS | BDRV_O_RDWR;
1097 1098 1099
    /* Parse commandline parameters */
    for(;;) {
        c = getopt(argc, argv, "la:c:d:h");
1100
        if (c == -1) {
1101
            break;
1102
        }
1103
        switch(c) {
J
Jes Sorensen 已提交
1104
        case '?':
1105 1106
        case 'h':
            help();
1107
            return 0;
1108 1109 1110
        case 'l':
            if (action) {
                help();
1111
                return 0;
1112 1113
            }
            action = SNAPSHOT_LIST;
1114
            bdrv_oflags &= ~BDRV_O_RDWR; /* no need for RW */
1115 1116 1117 1118
            break;
        case 'a':
            if (action) {
                help();
1119
                return 0;
1120 1121 1122 1123 1124 1125 1126
            }
            action = SNAPSHOT_APPLY;
            snapshot_name = optarg;
            break;
        case 'c':
            if (action) {
                help();
1127
                return 0;
1128 1129 1130 1131 1132 1133 1134
            }
            action = SNAPSHOT_CREATE;
            snapshot_name = optarg;
            break;
        case 'd':
            if (action) {
                help();
1135
                return 0;
1136 1137 1138 1139 1140 1141 1142
            }
            action = SNAPSHOT_DELETE;
            snapshot_name = optarg;
            break;
        }
    }

1143
    if (optind >= argc) {
1144
        help();
1145
    }
1146 1147 1148
    filename = argv[optind++];

    /* Open the image */
1149
    bs = bdrv_new_open(filename, NULL, bdrv_oflags);
1150 1151 1152
    if (!bs) {
        return 1;
    }
1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168

    /* 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);
1169
        if (ret) {
1170
            error_report("Could not create snapshot '%s': %d (%s)",
1171
                snapshot_name, ret, strerror(-ret));
1172
        }
1173 1174 1175 1176
        break;

    case SNAPSHOT_APPLY:
        ret = bdrv_snapshot_goto(bs, snapshot_name);
1177
        if (ret) {
1178
            error_report("Could not apply snapshot '%s': %d (%s)",
1179
                snapshot_name, ret, strerror(-ret));
1180
        }
1181 1182 1183 1184
        break;

    case SNAPSHOT_DELETE:
        ret = bdrv_snapshot_delete(bs, snapshot_name);
1185
        if (ret) {
1186
            error_report("Could not delete snapshot '%s': %d (%s)",
1187
                snapshot_name, ret, strerror(-ret));
1188
        }
1189 1190 1191 1192 1193
        break;
    }

    /* Cleanup */
    bdrv_delete(bs);
1194 1195 1196
    if (ret) {
        return 1;
    }
1197
    return 0;
1198 1199
}

K
Kevin Wolf 已提交
1200 1201
static int img_rebase(int argc, char **argv)
{
1202
    BlockDriverState *bs, *bs_old_backing = NULL, *bs_new_backing = NULL;
1203
    BlockDriver *old_backing_drv, *new_backing_drv;
K
Kevin Wolf 已提交
1204
    char *filename;
K
Kevin Wolf 已提交
1205
    const char *fmt, *out_basefmt, *out_baseimg;
K
Kevin Wolf 已提交
1206 1207
    int c, flags, ret;
    int unsafe = 0;
1208
    int progress = 0;
K
Kevin Wolf 已提交
1209 1210

    /* Parse commandline parameters */
K
Kevin Wolf 已提交
1211
    fmt = NULL;
K
Kevin Wolf 已提交
1212 1213 1214 1215
    out_baseimg = NULL;
    out_basefmt = NULL;

    for(;;) {
1216
        c = getopt(argc, argv, "uhf:F:b:p");
1217
        if (c == -1) {
K
Kevin Wolf 已提交
1218
            break;
1219
        }
K
Kevin Wolf 已提交
1220
        switch(c) {
J
Jes Sorensen 已提交
1221
        case '?':
K
Kevin Wolf 已提交
1222 1223 1224
        case 'h':
            help();
            return 0;
K
Kevin Wolf 已提交
1225 1226 1227
        case 'f':
            fmt = optarg;
            break;
K
Kevin Wolf 已提交
1228 1229 1230 1231 1232 1233 1234 1235 1236
        case 'F':
            out_basefmt = optarg;
            break;
        case 'b':
            out_baseimg = optarg;
            break;
        case 'u':
            unsafe = 1;
            break;
1237 1238 1239
        case 'p':
            progress = 1;
            break;
K
Kevin Wolf 已提交
1240 1241 1242
        }
    }

1243
    if ((optind >= argc) || !out_baseimg) {
K
Kevin Wolf 已提交
1244
        help();
1245
    }
K
Kevin Wolf 已提交
1246 1247
    filename = argv[optind++];

1248 1249 1250
    qemu_progress_init(progress, 2.0);
    qemu_progress_print(0, 100);

K
Kevin Wolf 已提交
1251 1252 1253 1254 1255 1256
    /*
     * Open the images.
     *
     * Ignore the old backing file for unsafe rebase in case we want to correct
     * the reference to a renamed or moved backing file.
     */
1257
    flags = BDRV_O_FLAGS | BDRV_O_RDWR | (unsafe ? BDRV_O_NO_BACKING : 0);
1258
    bs = bdrv_new_open(filename, fmt, flags);
1259 1260 1261
    if (!bs) {
        return 1;
    }
K
Kevin Wolf 已提交
1262 1263 1264 1265 1266 1267 1268 1269

    /* Find the right drivers for the backing files */
    old_backing_drv = NULL;
    new_backing_drv = NULL;

    if (!unsafe && bs->backing_format[0] != '\0') {
        old_backing_drv = bdrv_find_format(bs->backing_format);
        if (old_backing_drv == NULL) {
1270
            error_report("Invalid format name: '%s'", bs->backing_format);
1271 1272
            ret = -1;
            goto out;
K
Kevin Wolf 已提交
1273 1274 1275 1276 1277 1278
        }
    }

    if (out_basefmt != NULL) {
        new_backing_drv = bdrv_find_format(out_basefmt);
        if (new_backing_drv == NULL) {
1279
            error_report("Invalid format name: '%s'", out_basefmt);
1280 1281
            ret = -1;
            goto out;
K
Kevin Wolf 已提交
1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294
        }
    }

    /* For safe rebasing we need to compare old and new backing file */
    if (unsafe) {
        /* Make the compiler happy */
        bs_old_backing = NULL;
        bs_new_backing = NULL;
    } else {
        char backing_name[1024];

        bs_old_backing = bdrv_new("old_backing");
        bdrv_get_backing_filename(bs, backing_name, sizeof(backing_name));
1295 1296 1297
        ret = bdrv_open(bs_old_backing, backing_name, BDRV_O_FLAGS,
                        old_backing_drv);
        if (ret) {
1298
            error_report("Could not open old backing file '%s'", backing_name);
1299
            goto out;
K
Kevin Wolf 已提交
1300 1301 1302
        }

        bs_new_backing = bdrv_new("new_backing");
1303
        ret = bdrv_open(bs_new_backing, out_baseimg, BDRV_O_FLAGS,
1304 1305
                        new_backing_drv);
        if (ret) {
1306
            error_report("Could not open new backing file '%s'", out_baseimg);
1307
            goto out;
K
Kevin Wolf 已提交
1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322
        }
    }

    /*
     * Check each unallocated cluster in the COW file. If it is unallocated,
     * accesses go to the backing file. We must therefore compare this cluster
     * in the old and new backing file, and if they differ we need to copy it
     * from the old backing file into the COW file.
     *
     * If qemu-img crashes during this step, no harm is done. The content of
     * the image is the same as the original one at any time.
     */
    if (!unsafe) {
        uint64_t num_sectors;
        uint64_t sector;
1323
        int n;
1324 1325
        uint8_t * buf_old;
        uint8_t * buf_new;
1326
        float local_progress;
1327 1328 1329

        buf_old = qemu_malloc(IO_BUF_SIZE);
        buf_new = qemu_malloc(IO_BUF_SIZE);
K
Kevin Wolf 已提交
1330 1331 1332

        bdrv_get_geometry(bs, &num_sectors);

1333 1334
        local_progress = (float)100 /
            (num_sectors / MIN(num_sectors, (IO_BUF_SIZE / 512)));
K
Kevin Wolf 已提交
1335 1336 1337 1338 1339 1340 1341 1342 1343 1344
        for (sector = 0; sector < num_sectors; sector += n) {

            /* How many sectors can we handle with the next read? */
            if (sector + (IO_BUF_SIZE / 512) <= num_sectors) {
                n = (IO_BUF_SIZE / 512);
            } else {
                n = num_sectors - sector;
            }

            /* If the cluster is allocated, we don't need to take action */
1345 1346
            ret = bdrv_is_allocated(bs, sector, n, &n);
            if (ret) {
K
Kevin Wolf 已提交
1347 1348 1349 1350
                continue;
            }

            /* Read old and new backing file */
1351 1352
            ret = bdrv_read(bs_old_backing, sector, buf_old, n);
            if (ret < 0) {
1353
                error_report("error while reading from old backing file");
1354
                goto out;
K
Kevin Wolf 已提交
1355
            }
1356 1357
            ret = bdrv_read(bs_new_backing, sector, buf_new, n);
            if (ret < 0) {
1358
                error_report("error while reading from new backing file");
1359
                goto out;
K
Kevin Wolf 已提交
1360 1361 1362 1363 1364 1365 1366 1367 1368
            }

            /* If they differ, we need to write to the COW file */
            uint64_t written = 0;

            while (written < n) {
                int pnum;

                if (compare_sectors(buf_old + written * 512,
1369
                    buf_new + written * 512, n - written, &pnum))
K
Kevin Wolf 已提交
1370 1371 1372 1373
                {
                    ret = bdrv_write(bs, sector + written,
                        buf_old + written * 512, pnum);
                    if (ret < 0) {
1374
                        error_report("Error while writing to COW image: %s",
K
Kevin Wolf 已提交
1375
                            strerror(-ret));
1376
                        goto out;
K
Kevin Wolf 已提交
1377 1378 1379 1380 1381
                    }
                }

                written += pnum;
            }
1382
            qemu_progress_print(local_progress, 100);
K
Kevin Wolf 已提交
1383
        }
1384 1385 1386

        qemu_free(buf_old);
        qemu_free(buf_new);
K
Kevin Wolf 已提交
1387 1388 1389 1390 1391 1392 1393 1394 1395
    }

    /*
     * Change the backing file. All clusters that are different from the old
     * backing file are overwritten in the COW file now, so the visible content
     * doesn't change when we switch the backing file.
     */
    ret = bdrv_change_backing_file(bs, out_baseimg, out_basefmt);
    if (ret == -ENOSPC) {
1396 1397
        error_report("Could not change the backing file to '%s': No "
                     "space left in the file header", out_baseimg);
K
Kevin Wolf 已提交
1398
    } else if (ret < 0) {
1399
        error_report("Could not change the backing file to '%s': %s",
K
Kevin Wolf 已提交
1400 1401 1402
            out_baseimg, strerror(-ret));
    }

1403
    qemu_progress_print(100, 0);
K
Kevin Wolf 已提交
1404 1405 1406 1407 1408 1409
    /*
     * TODO At this point it is possible to check if any clusters that are
     * allocated in the COW file are the same in the backing file. If so, they
     * could be dropped from the COW file. Don't do this before switching the
     * backing file, in case of a crash this would lead to corruption.
     */
1410
out:
1411
    qemu_progress_end();
K
Kevin Wolf 已提交
1412 1413
    /* Cleanup */
    if (!unsafe) {
1414 1415 1416 1417 1418 1419
        if (bs_old_backing != NULL) {
            bdrv_delete(bs_old_backing);
        }
        if (bs_new_backing != NULL) {
            bdrv_delete(bs_new_backing);
        }
K
Kevin Wolf 已提交
1420 1421 1422
    }

    bdrv_delete(bs);
1423 1424 1425
    if (ret) {
        return 1;
    }
K
Kevin Wolf 已提交
1426 1427 1428
    return 0;
}

1429 1430 1431 1432 1433
static int img_resize(int argc, char **argv)
{
    int c, ret, relative;
    const char *filename, *fmt, *size;
    int64_t n, total_size;
1434
    BlockDriverState *bs = NULL;
1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451
    QEMUOptionParameter *param;
    QEMUOptionParameter resize_options[] = {
        {
            .name = BLOCK_OPT_SIZE,
            .type = OPT_SIZE,
            .help = "Virtual disk size"
        },
        { NULL }
    };

    fmt = NULL;
    for(;;) {
        c = getopt(argc, argv, "f:h");
        if (c == -1) {
            break;
        }
        switch(c) {
J
Jes Sorensen 已提交
1452
        case '?':
1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469 1470 1471 1472 1473 1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484 1485
        case 'h':
            help();
            break;
        case 'f':
            fmt = optarg;
            break;
        }
    }
    if (optind + 1 >= argc) {
        help();
    }
    filename = argv[optind++];
    size = argv[optind++];

    /* Choose grow, shrink, or absolute resize mode */
    switch (size[0]) {
    case '+':
        relative = 1;
        size++;
        break;
    case '-':
        relative = -1;
        size++;
        break;
    default:
        relative = 0;
        break;
    }

    /* Parse size */
    param = parse_option_parameters("", resize_options, NULL);
    if (set_option_parameter(param, BLOCK_OPT_SIZE, size)) {
        /* Error message already printed when size parsing fails */
1486 1487
        ret = -1;
        goto out;
1488 1489 1490 1491 1492
    }
    n = get_option_parameter(param, BLOCK_OPT_SIZE)->value.n;
    free_option_parameters(param);

    bs = bdrv_new_open(filename, fmt, BDRV_O_FLAGS | BDRV_O_RDWR);
1493
    if (!bs) {
1494 1495
        ret = -1;
        goto out;
1496
    }
1497 1498 1499 1500 1501 1502 1503

    if (relative) {
        total_size = bdrv_getlength(bs) + n * relative;
    } else {
        total_size = n;
    }
    if (total_size <= 0) {
1504
        error_report("New image size must be positive");
1505 1506
        ret = -1;
        goto out;
1507 1508 1509 1510 1511 1512 1513 1514
    }

    ret = bdrv_truncate(bs, total_size);
    switch (ret) {
    case 0:
        printf("Image resized.\n");
        break;
    case -ENOTSUP:
1515
        error_report("This image format does not support resize");
1516 1517
        break;
    case -EACCES:
1518
        error_report("Image is read-only");
1519 1520
        break;
    default:
1521
        error_report("Error resizing image (%d)", -ret);
1522 1523
        break;
    }
1524
out:
1525 1526 1527
    if (bs) {
        bdrv_delete(bs);
    }
1528 1529 1530
    if (ret) {
        return 1;
    }
1531 1532 1533
    return 0;
}

A
Anthony Liguori 已提交
1534
static const img_cmd_t img_cmds[] = {
1535 1536 1537 1538 1539 1540 1541 1542
#define DEF(option, callback, arg_string)        \
    { option, callback },
#include "qemu-img-cmds.h"
#undef DEF
#undef GEN_DOCS
    { NULL, NULL, },
};

B
bellard 已提交
1543 1544
int main(int argc, char **argv)
{
A
Anthony Liguori 已提交
1545
    const img_cmd_t *cmd;
1546
    const char *cmdname;
B
bellard 已提交
1547

K
Kevin Wolf 已提交
1548 1549
    error_set_progname(argv[0]);

B
bellard 已提交
1550 1551 1552
    bdrv_init();
    if (argc < 2)
        help();
1553
    cmdname = argv[1];
1554
    argc--; argv++;
1555 1556 1557 1558 1559 1560

    /* find the command */
    for(cmd = img_cmds; cmd->name != NULL; cmd++) {
        if (!strcmp(cmdname, cmd->name)) {
            return cmd->handler(argc, argv);
        }
B
bellard 已提交
1561
    }
1562 1563 1564

    /* not found */
    help();
B
bellard 已提交
1565 1566
    return 0;
}