qemu-img.c

   1 /*
   2  * QEMU disk image utility
   3  *
   4  * Copyright (c) 2003-2008 Fabrice Bellard
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to deal
   8  * in the Software without restriction, including without limitation the rights
   9  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  10  * copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
  19  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  21  * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
  22  * THE SOFTWARE.
  23  */
  24 #include "qemu-common.h"
  25 #include "block_int.h"
  26 #include <assert.h>
  27
  28 #ifdef _WIN32
  29 #define WIN32_LEAN_AND_MEAN
  30 #include <windows.h>
  31 #endif
  32
  33 #ifdef _WIN32
  34
  35 void *qemu_memalign(size_t alignment, size_t size)
  36 {
  37     return VirtualAlloc(NULL, size, MEM_COMMIT, PAGE_READWRITE);
  38 }
  39
  40 #else
  41
  42 void *qemu_memalign(size_t alignment, size_t size)
  43 {
  44 #if defined(_POSIX_C_SOURCE)
  45     int ret;
  46     void *ptr;
  47     ret = posix_memalign(&ptr, alignment, size);
  48     if (ret != 0)
  49         return NULL;
  50     return ptr;
  51 #elif defined(_BSD)
  52     return valloc(size);
  53 #else
  54     return memalign(alignment, size);
  55 #endif
  56 }
  57
  58 #endif
  59
  60 static void __attribute__((noreturn)) error(const char *fmt, ...)
  61 {
  62     va_list ap;
  63     va_start(ap, fmt);
  64     fprintf(stderr, "qemu-img: ");
  65     vfprintf(stderr, fmt, ap);
  66     fprintf(stderr, "\n");
  67     exit(1);
  68     va_end(ap);
  69 }
  70
  71 static void format_print(void *opaque, const char *name)
  72 {
  73     printf(" %s", name);
  74 }
  75
  76 static void help(void)
  77 {
  78     printf("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
  79            "usage: qemu-img command [command options]\n"
  80            "QEMU disk image utility\n"
  81            "\n"
  82            "Command syntax:\n"
  83            "  create [-e] [-6] [-b base_image] [-f fmt] filename [size]\n"
  84            "  commit [-f fmt] filename\n"
  85            "  convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] filename [filename2 [...]] output_filename\n"
  86            "  info [-f fmt] filename\n"
  87            "\n"
  88            "Command parameters:\n"
  89            "  'filename' is a disk image filename\n"
  90            "  'base_image' is the read-only disk image which is used as base for a copy on\n"
  91            "    write image; the copy on write image only stores the modified data\n"
  92            "  'fmt' is the disk image format. It is guessed automatically in most cases\n"
  93            "  'size' is the disk image size in kilobytes. Optional suffixes 'M' (megabyte)\n"
  94            "    and 'G' (gigabyte) are supported\n"
  95            "  'output_filename' is the destination disk image filename\n"
  96            "  'output_fmt' is the destination format\n"
  97            "  '-c' indicates that target image must be compressed (qcow format only)\n"
  98            "  '-e' indicates that the target image must be encrypted (qcow format only)\n"
  99            "  '-6' indicates that the target image must use compatibility level 6 (vmdk format only)\n"
 100            );
 101     printf("\nSupported format:");
 102     bdrv_iterate_format(format_print, NULL);
 103     printf("\n");
 104     exit(1);
 105 }
 106
 107 #if defined(WIN32)
 108 /* XXX: put correct support for win32 */
 109 static int read_password(char *buf, int buf_size)
 110 {
 111     int c, i;
 112     printf("Password: ");
 113     fflush(stdout);
 114     i = 0;
 115     for(;;) {
 116         c = getchar();
 117         if (c == '\n')
 118             break;
 119         if (i < (buf_size - 1))
 120             buf[i++] = c;
 121     }
 122     buf[i] = '\0';
 123     return 0;
 124 }
 125
 126 #else
 127
 128 #include <termios.h>
 129
 130 static struct termios oldtty;
 131
 132 static void term_exit(void)
 133 {
 134     tcsetattr (0, TCSANOW, &oldtty);
 135 }
 136
 137 static void term_init(void)
 138 {
 139     struct termios tty;
 140
 141     tcgetattr (0, &tty);
 142     oldtty = tty;
 143
 144     tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
 145                           |INLCR|IGNCR|ICRNL|IXON);
 146     tty.c_oflag |= OPOST;
 147     tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
 148     tty.c_cflag &= ~(CSIZE|PARENB);
 149     tty.c_cflag |= CS8;
 150     tty.c_cc[VMIN] = 1;
 151     tty.c_cc[VTIME] = 0;
 152
 153     tcsetattr (0, TCSANOW, &tty);
 154
 155     atexit(term_exit);
 156 }
 157
 158 static int read_password(char *buf, int buf_size)
 159 {
 160     uint8_t ch;
 161     int i, ret;
 162
 163     printf("password: ");
 164     fflush(stdout);
 165     term_init();
 166     i = 0;
 167     for(;;) {
 168         ret = read(0, &ch, 1);
 169         if (ret == -1) {
 170             if (errno == EAGAIN || errno == EINTR) {
 171                 continue;
 172             } else {
 173                 ret = -1;
 174                 break;
 175             }
 176         } else if (ret == 0) {
 177             ret = -1;
 178             break;
 179         } else {
 180             if (ch == '\r') {
 181                 ret = 0;
 182                 break;
 183             }
 184             if (i < (buf_size - 1))
 185                 buf[i++] = ch;
 186         }
 187     }
 188     term_exit();
 189     buf[i] = '\0';
 190     printf("\n");
 191     return ret;
 192 }
 193 #endif
 194
 195 static BlockDriverState *bdrv_new_open(const char *filename,
 196                                        const char *fmt)
 197 {
 198     BlockDriverState *bs;
 199     BlockDriver *drv;
 200     char password[256];
 201
 202     bs = bdrv_new("");
 203     if (!bs)
 204         error("Not enough memory");
 205     if (fmt) {
 206         drv = bdrv_find_format(fmt);
 207         if (!drv)
 208             error("Unknown file format '%s'", fmt);
 209     } else {
 210         drv = NULL;
 211     }
 212     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 213         error("Could not open '%s'", filename);
 214     }
 215     if (bdrv_is_encrypted(bs)) {
 216         printf("Disk image '%s' is encrypted.\n", filename);
 217         if (read_password(password, sizeof(password)) < 0)
 218             error("No password given");
 219         if (bdrv_set_key(bs, password) < 0)
 220             error("invalid password");
 221     }
 222     return bs;
 223 }
 224
 225 static int img_create(int argc, char **argv)
 226 {
 227     int c, ret, flags;
 228     const char *fmt = "raw";
 229     const char *filename;
 230     const char *base_filename = NULL;
 231     uint64_t size;
 232     const char *p;
 233     BlockDriver *drv;
 234
 235     flags = 0;
 236     for(;;) {
 237         c = getopt(argc, argv, "b:f:he6");
 238         if (c == -1)
 239             break;
 240         switch(c) {
 241         case 'h':
 242             help();
 243             break;
 244         case 'b':
 245             base_filename = optarg;
 246             break;
 247         case 'f':
 248             fmt = optarg;
 249             break;
 250         case 'e':
 251             flags |= BLOCK_FLAG_ENCRYPT;
 252             break;
 253         case '6':
 254             flags |= BLOCK_FLAG_COMPAT6;
 255             break;
 256         }
 257     }
 258     if (optind >= argc)
 259         help();
 260     filename = argv[optind++];
 261     size = 0;
 262     if (base_filename) {
 263         BlockDriverState *bs;
 264         bs = bdrv_new_open(base_filename, NULL);
 265         bdrv_get_geometry(bs, &size);
 266         size *= 512;
 267         bdrv_delete(bs);
 268     } else {
 269         if (optind >= argc)
 270             help();
 271         p = argv[optind];
 272         size = strtoul(p, (char **)&p, 0);
 273         if (*p == 'M') {
 274             size *= 1024 * 1024;
 275         } else if (*p == 'G') {
 276             size *= 1024 * 1024 * 1024;
 277         } else if (*p == 'k' || *p == 'K' || *p == '\0') {
 278             size *= 1024;
 279         } else {
 280             help();
 281         }
 282     }
 283     drv = bdrv_find_format(fmt);
 284     if (!drv)
 285         error("Unknown file format '%s'", fmt);
 286     printf("Formatting '%s', fmt=%s",
 287            filename, fmt);
 288     if (flags & BLOCK_FLAG_ENCRYPT)
 289         printf(", encrypted");
 290     if (flags & BLOCK_FLAG_COMPAT6)
 291         printf(", compatibility level=6");
 292     if (base_filename) {
 293         printf(", backing_file=%s",
 294                base_filename);
 295     }
 296     printf(", size=%" PRIu64 " kB\n", size / 1024);
 297     ret = bdrv_create(drv, filename, size / 512, base_filename, flags);
 298     if (ret < 0) {
 299         if (ret == -ENOTSUP) {
 300             error("Formatting or formatting option not supported for file format '%s'", fmt);
 301         } else {
 302             error("Error while formatting");
 303         }
 304     }
 305     return 0;
 306 }
 307
 308 static int img_commit(int argc, char **argv)
 309 {
 310     int c, ret;
 311     const char *filename, *fmt;
 312     BlockDriver *drv;
 313     BlockDriverState *bs;
 314
 315     fmt = NULL;
 316     for(;;) {
 317         c = getopt(argc, argv, "f:h");
 318         if (c == -1)
 319             break;
 320         switch(c) {
 321         case 'h':
 322             help();
 323             break;
 324         case 'f':
 325             fmt = optarg;
 326             break;
 327         }
 328     }
 329     if (optind >= argc)
 330         help();
 331     filename = argv[optind++];
 332
 333     bs = bdrv_new("");
 334     if (!bs)
 335         error("Not enough memory");
 336     if (fmt) {
 337         drv = bdrv_find_format(fmt);
 338         if (!drv)
 339             error("Unknown file format '%s'", fmt);
 340     } else {
 341         drv = NULL;
 342     }
 343     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 344         error("Could not open '%s'", filename);
 345     }
 346     ret = bdrv_commit(bs);
 347     switch(ret) {
 348     case 0:
 349         printf("Image committed.\n");
 350         break;
 351     case -ENOENT:
 352         error("No disk inserted");
 353         break;
 354     case -EACCES:
 355         error("Image is read-only");
 356         break;
 357     case -ENOTSUP:
 358         error("Image is already committed");
 359         break;
 360     default:
 361         error("Error while committing image");
 362         break;
 363     }
 364
 365     bdrv_delete(bs);
 366     return 0;
 367 }
 368
 369 static int is_not_zero(const uint8_t *sector, int len)
 370 {
 371     int i;
 372     len >>= 2;
 373     for(i = 0;i < len; i++) {
 374         if (((uint32_t *)sector)[i] != 0)
 375             return 1;
 376     }
 377     return 0;
 378 }
 379
 380 static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
 381 {
 382     int v, i;
 383
 384     if (n <= 0) {
 385         *pnum = 0;
 386         return 0;
 387     }
 388     v = is_not_zero(buf, 512);
 389     for(i = 1; i < n; i++) {
 390         buf += 512;
 391         if (v != is_not_zero(buf, 512))
 392             break;
 393     }
 394     *pnum = i;
 395     return v;
 396 }
 397
 398 #define IO_BUF_SIZE 65536
 399
 400 static int img_convert(int argc, char **argv)
 401 {
 402     int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
 403     const char *fmt, *out_fmt, *out_filename;
 404     BlockDriver *drv;
 405     BlockDriverState **bs, *out_bs;
 406     int64_t total_sectors, nb_sectors, sector_num, bs_offset;
 407     uint64_t bs_sectors;
 408     uint8_t buf[IO_BUF_SIZE];
 409     const uint8_t *buf1;
 410     BlockDriverInfo bdi;
 411
 412     fmt = NULL;
 413     out_fmt = "raw";
 414     flags = 0;
 415     for(;;) {
 416         c = getopt(argc, argv, "f:O:hce6");
 417         if (c == -1)
 418             break;
 419         switch(c) {
 420         case 'h':
 421             help();
 422             break;
 423         case 'f':
 424             fmt = optarg;
 425             break;
 426         case 'O':
 427             out_fmt = optarg;
 428             break;
 429         case 'c':
 430             flags |= BLOCK_FLAG_COMPRESS;
 431             break;
 432         case 'e':
 433             flags |= BLOCK_FLAG_ENCRYPT;
 434             break;
 435         case '6':
 436             flags |= BLOCK_FLAG_COMPAT6;
 437             break;
 438         }
 439     }
 440
 441     bs_n = argc - optind - 1;
 442     if (bs_n < 1) help();
 443
 444     out_filename = argv[argc - 1];
 445
 446     bs = calloc(bs_n, sizeof(BlockDriverState *));
 447     if (!bs)
 448         error("Out of memory");
 449
 450     total_sectors = 0;
 451     for (bs_i = 0; bs_i < bs_n; bs_i++) {
 452         bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);
 453         if (!bs[bs_i])
 454             error("Could not open '%s'", argv[optind + bs_i]);
 455         bdrv_get_geometry(bs[bs_i], &bs_sectors);
 456         total_sectors += bs_sectors;
 457     }
 458
 459     drv = bdrv_find_format(out_fmt);
 460     if (!drv)
 461         error("Unknown file format '%s'", out_fmt);
 462     if (flags & BLOCK_FLAG_COMPRESS && drv != &bdrv_qcow && drv != &bdrv_qcow2)
 463         error("Compression not supported for this file format");
 464     if (flags & BLOCK_FLAG_ENCRYPT && drv != &bdrv_qcow && drv != &bdrv_qcow2)
 465         error("Encryption not supported for this file format");
 466     if (flags & BLOCK_FLAG_COMPAT6 && drv != &bdrv_vmdk)
 467         error("Alternative compatibility level not supported for this file format");
 468     if (flags & BLOCK_FLAG_ENCRYPT && flags & BLOCK_FLAG_COMPRESS)
 469         error("Compression and encryption not supported at the same time");
 470
 471     ret = bdrv_create(drv, out_filename, total_sectors, NULL, flags);
 472     if (ret < 0) {
 473         if (ret == -ENOTSUP) {
 474             error("Formatting not supported for file format '%s'", fmt);
 475         } else {
 476             error("Error while formatting '%s'", out_filename);
 477         }
 478     }
 479
 480     out_bs = bdrv_new_open(out_filename, out_fmt);
 481
 482     bs_i = 0;
 483     bs_offset = 0;
 484     bdrv_get_geometry(bs[0], &bs_sectors);
 485
 486     if (flags & BLOCK_FLAG_COMPRESS) {
 487         if (bdrv_get_info(out_bs, &bdi) < 0)
 488             error("could not get block driver info");
 489         cluster_size = bdi.cluster_size;
 490         if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
 491             error("invalid cluster size");
 492         cluster_sectors = cluster_size >> 9;
 493         sector_num = 0;
 494         for(;;) {
 495             int64_t bs_num;
 496             int remainder;
 497             uint8_t *buf2;
 498
 499             nb_sectors = total_sectors - sector_num;
 500             if (nb_sectors <= 0)
 501                 break;
 502             if (nb_sectors >= cluster_sectors)
 503                 n = cluster_sectors;
 504             else
 505                 n = nb_sectors;
 506
 507             bs_num = sector_num - bs_offset;
 508             assert (bs_num >= 0);
 509             remainder = n;
 510             buf2 = buf;
 511             while (remainder > 0) {
 512                 int nlow;
 513                 while (bs_num == bs_sectors) {
 514                     bs_i++;
 515                     assert (bs_i < bs_n);
 516                     bs_offset += bs_sectors;
 517                     bdrv_get_geometry(bs[bs_i], &bs_sectors);
 518                     bs_num = 0;
 519                     /* printf("changing part: sector_num=%lld, "
 520                        "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
 521                        sector_num, bs_i, bs_offset, bs_sectors); */
 522                 }
 523                 assert (bs_num < bs_sectors);
 524
 525                 nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;
 526
 527                 if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0)
 528                     error("error while reading");
 529
 530                 buf2 += nlow * 512;
 531                 bs_num += nlow;
 532
 533                 remainder -= nlow;
 534             }
 535             assert (remainder == 0);
 536
 537             if (n < cluster_sectors)
 538                 memset(buf + n * 512, 0, cluster_size - n * 512);
 539             if (is_not_zero(buf, cluster_size)) {
 540                 if (bdrv_write_compressed(out_bs, sector_num, buf,
 541                                           cluster_sectors) != 0)
 542                     error("error while compressing sector %" PRId64,
 543                           sector_num);
 544             }
 545             sector_num += n;
 546         }
 547         /* signal EOF to align */
 548         bdrv_write_compressed(out_bs, 0, NULL, 0);
 549     } else {
 550         sector_num = 0;
 551         for(;;) {
 552             nb_sectors = total_sectors - sector_num;
 553             if (nb_sectors <= 0)
 554                 break;
 555             if (nb_sectors >= (IO_BUF_SIZE / 512))
 556                 n = (IO_BUF_SIZE / 512);
 557             else
 558                 n = nb_sectors;
 559
 560             while (sector_num - bs_offset >= bs_sectors) {
 561                 bs_i ++;
 562                 assert (bs_i < bs_n);
 563                 bs_offset += bs_sectors;
 564                 bdrv_get_geometry(bs[bs_i], &bs_sectors);
 565                 /* printf("changing part: sector_num=%lld, bs_i=%d, "
 566                   "bs_offset=%lld, bs_sectors=%lld\n",
 567                    sector_num, bs_i, bs_offset, bs_sectors); */
 568             }
 569
 570             if (n > bs_offset + bs_sectors - sector_num)
 571                 n = bs_offset + bs_sectors - sector_num;
 572
 573             if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0)
 574                 error("error while reading");
 575             /* NOTE: at the same time we convert, we do not write zero
 576                sectors to have a chance to compress the image. Ideally, we
 577                should add a specific call to have the info to go faster */
 578             buf1 = buf;
 579             while (n > 0) {
 580                 if (is_allocated_sectors(buf1, n, &n1)) {
 581                     if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
 582                         error("error while writing");
 583                 }
 584                 sector_num += n1;
 585                 n -= n1;
 586                 buf1 += n1 * 512;
 587             }
 588         }
 589     }
 590     bdrv_delete(out_bs);
 591     for (bs_i = 0; bs_i < bs_n; bs_i++)
 592         bdrv_delete(bs[bs_i]);
 593     free(bs);
 594     return 0;
 595 }
 596
 597 #ifdef _WIN32
 598 static int64_t get_allocated_file_size(const char *filename)
 599 {
 600     typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
 601     get_compressed_t get_compressed;
 602     struct _stati64 st;
 603
 604     /* WinNT support GetCompressedFileSize to determine allocate size */
 605     get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");
 606     if (get_compressed) {
 607         DWORD high, low;
 608         low = get_compressed(filename, &high);
 609         if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)
 610             return (((int64_t) high) << 32) + low;
 611     }
 612
 613     if (_stati64(filename, &st) < 0)
 614         return -1;
 615     return st.st_size;
 616 }
 617 #else
 618 static int64_t get_allocated_file_size(const char *filename)
 619 {
 620     struct stat st;
 621     if (stat(filename, &st) < 0)
 622         return -1;
 623     return (int64_t)st.st_blocks * 512;
 624 }
 625 #endif
 626
 627 static void dump_snapshots(BlockDriverState *bs)
 628 {
 629     QEMUSnapshotInfo *sn_tab, *sn;
 630     int nb_sns, i;
 631     char buf[256];
 632
 633     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
 634     if (nb_sns <= 0)
 635         return;
 636     printf("Snapshot list:\n");
 637     printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
 638     for(i = 0; i < nb_sns; i++) {
 639         sn = &sn_tab[i];
 640         printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
 641     }
 642     qemu_free(sn_tab);
 643 }
 644
 645 static int img_info(int argc, char **argv)
 646 {
 647     int c;
 648     const char *filename, *fmt;
 649     BlockDriver *drv;
 650     BlockDriverState *bs;
 651     char fmt_name[128], size_buf[128], dsize_buf[128];
 652     uint64_t total_sectors;
 653     int64_t allocated_size;
 654     char backing_filename[1024];
 655     char backing_filename2[1024];
 656     BlockDriverInfo bdi;
 657
 658     fmt = NULL;
 659     for(;;) {
 660         c = getopt(argc, argv, "f:h");
 661         if (c == -1)
 662             break;
 663         switch(c) {
 664         case 'h':
 665             help();
 666             break;
 667         case 'f':
 668             fmt = optarg;
 669             break;
 670         }
 671     }
 672     if (optind >= argc)
 673         help();
 674     filename = argv[optind++];
 675
 676     bs = bdrv_new("");
 677     if (!bs)
 678         error("Not enough memory");
 679     if (fmt) {
 680         drv = bdrv_find_format(fmt);
 681         if (!drv)
 682             error("Unknown file format '%s'", fmt);
 683     } else {
 684         drv = NULL;
 685     }
 686     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 687         error("Could not open '%s'", filename);
 688     }
 689     bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
 690     bdrv_get_geometry(bs, &total_sectors);
 691     get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
 692     allocated_size = get_allocated_file_size(filename);
 693     if (allocated_size < 0)
 694         sprintf(dsize_buf, "unavailable");
 695     else
 696         get_human_readable_size(dsize_buf, sizeof(dsize_buf),
 697                                 allocated_size);
 698     printf("image: %s\n"
 699            "file format: %s\n"
 700            "virtual size: %s (%" PRId64 " bytes)\n"
 701            "disk size: %s\n",
 702            filename, fmt_name, size_buf,
 703            (total_sectors * 512),
 704            dsize_buf);
 705     if (bdrv_is_encrypted(bs))
 706         printf("encrypted: yes\n");
 707     if (bdrv_get_info(bs, &bdi) >= 0) {
 708         if (bdi.cluster_size != 0)
 709             printf("cluster_size: %d\n", bdi.cluster_size);
 710     }
 711     bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
 712     if (backing_filename[0] != '\0') {
 713         path_combine(backing_filename2, sizeof(backing_filename2),
 714                      filename, backing_filename);
 715         printf("backing file: %s (actual path: %s)\n",
 716                backing_filename,
 717                backing_filename2);
 718     }
 719     dump_snapshots(bs);
 720     bdrv_delete(bs);
 721     return 0;
 722 }
 723
 724 int main(int argc, char **argv)
 725 {
 726     const char *cmd;
 727
 728     bdrv_init();
 729     if (argc < 2)
 730         help();
 731     cmd = argv[1];
 732     optind++;
 733     if (!strcmp(cmd, "create")) {
 734         img_create(argc, argv);
 735     } else if (!strcmp(cmd, "commit")) {
 736         img_commit(argc, argv);
 737     } else if (!strcmp(cmd, "convert")) {
 738         img_convert(argc, argv);
 739     } else if (!strcmp(cmd, "info")) {
 740         img_info(argc, argv);
 741     } else {
 742         help();
 743     }
 744     return 0;
 745 }