qemu-img.c

   1 /*
   2  * QEMU disk image utility
   3  *
   4  * Copyright (c) 2003-2007 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 #include <windows.h>
  30 #endif
  31
  32 void *get_mmap_addr(unsigned long size)
  33 {
  34     return NULL;
  35 }
  36
  37 void qemu_free(void *ptr)
  38 {
  39     free(ptr);
  40 }
  41
  42 void *qemu_malloc(size_t size)
  43 {
  44     return malloc(size);
  45 }
  46
  47 void *qemu_mallocz(size_t size)
  48 {
  49     void *ptr;
  50     ptr = qemu_malloc(size);
  51     if (!ptr)
  52         return NULL;
  53     memset(ptr, 0, size);
  54     return ptr;
  55 }
  56
  57 char *qemu_strdup(const char *str)
  58 {
  59     char *ptr;
  60     ptr = qemu_malloc(strlen(str) + 1);
  61     if (!ptr)
  62         return NULL;
  63     strcpy(ptr, str);
  64     return ptr;
  65 }
  66
  67 static void __attribute__((noreturn)) error(const char *fmt, ...)
  68 {
  69     va_list ap;
  70     va_start(ap, fmt);
  71     fprintf(stderr, "qemu-img: ");
  72     vfprintf(stderr, fmt, ap);
  73     fprintf(stderr, "\n");
  74     exit(1);
  75     va_end(ap);
  76 }
  77
  78 static void format_print(void *opaque, const char *name)
  79 {
  80     printf(" %s", name);
  81 }
  82
  83 static void help(void)
  84 {
  85     printf("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2007 Fabrice Bellard\n"
  86            "usage: qemu-img command [command options]\n"
  87            "QEMU disk image utility\n"
  88            "\n"
  89            "Command syntax:\n"
  90            "  create [-e] [-6] [-b base_image] [-f fmt] filename [size]\n"
  91            "  commit [-f fmt] filename\n"
  92            "  convert [-c] [-e] [-6] [-f fmt] filename [filename2 [...]] [-O output_fmt] output_filename\n"
  93            "  info [-f fmt] filename\n"
  94            "\n"
  95            "Command parameters:\n"
  96            "  'filename' is a disk image filename\n"
  97            "  'base_image' is the read-only disk image which is used as base for a copy on\n"
  98            "    write image; the copy on write image only stores the modified data\n"
  99            "  'fmt' is the disk image format. It is guessed automatically in most cases\n"
 100            "  'size' is the disk image size in kilobytes. Optional suffixes 'M' (megabyte)\n"
 101            "    and 'G' (gigabyte) are supported\n"
 102            "  'output_filename' is the destination disk image filename\n"
 103            "  'output_fmt' is the destination format\n"
 104            "  '-c' indicates that target image must be compressed (qcow format only)\n"
 105            "  '-e' indicates that the target image must be encrypted (qcow format only)\n"
 106            "  '-6' indicates that the target image must use compatibility level 6 (vmdk format only)\n"
 107            );
 108     printf("\nSupported format:");
 109     bdrv_iterate_format(format_print, NULL);
 110     printf("\n");
 111     exit(1);
 112 }
 113
 114 #if defined(WIN32)
 115 /* XXX: put correct support for win32 */
 116 static int read_password(char *buf, int buf_size)
 117 {
 118     int c, i;
 119     printf("Password: ");
 120     fflush(stdout);
 121     i = 0;
 122     for(;;) {
 123         c = getchar();
 124         if (c == '\n')
 125             break;
 126         if (i < (buf_size - 1))
 127             buf[i++] = c;
 128     }
 129     buf[i] = '\0';
 130     return 0;
 131 }
 132
 133 #else
 134
 135 #include <termios.h>
 136
 137 static struct termios oldtty;
 138
 139 static void term_exit(void)
 140 {
 141     tcsetattr (0, TCSANOW, &oldtty);
 142 }
 143
 144 static void term_init(void)
 145 {
 146     struct termios tty;
 147
 148     tcgetattr (0, &tty);
 149     oldtty = tty;
 150
 151     tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
 152                           |INLCR|IGNCR|ICRNL|IXON);
 153     tty.c_oflag |= OPOST;
 154     tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
 155     tty.c_cflag &= ~(CSIZE|PARENB);
 156     tty.c_cflag |= CS8;
 157     tty.c_cc[VMIN] = 1;
 158     tty.c_cc[VTIME] = 0;
 159
 160     tcsetattr (0, TCSANOW, &tty);
 161
 162     atexit(term_exit);
 163 }
 164
 165 static int read_password(char *buf, int buf_size)
 166 {
 167     uint8_t ch;
 168     int i, ret;
 169
 170     printf("password: ");
 171     fflush(stdout);
 172     term_init();
 173     i = 0;
 174     for(;;) {
 175         ret = read(0, &ch, 1);
 176         if (ret == -1) {
 177             if (errno == EAGAIN || errno == EINTR) {
 178                 continue;
 179             } else {
 180                 ret = -1;
 181                 break;
 182             }
 183         } else if (ret == 0) {
 184             ret = -1;
 185             break;
 186         } else {
 187             if (ch == '\r') {
 188                 ret = 0;
 189                 break;
 190             }
 191             if (i < (buf_size - 1))
 192                 buf[i++] = ch;
 193         }
 194     }
 195     term_exit();
 196     buf[i] = '\0';
 197     printf("\n");
 198     return ret;
 199 }
 200 #endif
 201
 202 static BlockDriverState *bdrv_new_open(const char *filename,
 203                                        const char *fmt)
 204 {
 205     BlockDriverState *bs;
 206     BlockDriver *drv;
 207     char password[256];
 208
 209     bs = bdrv_new("");
 210     if (!bs)
 211         error("Not enough memory");
 212     if (fmt) {
 213         drv = bdrv_find_format(fmt);
 214         if (!drv)
 215             error("Unknown file format '%s'", fmt);
 216     } else {
 217         drv = NULL;
 218     }
 219     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 220         error("Could not open '%s'", filename);
 221     }
 222     if (bdrv_is_encrypted(bs)) {
 223         printf("Disk image '%s' is encrypted.\n", filename);
 224         if (read_password(password, sizeof(password)) < 0)
 225             error("No password given");
 226         if (bdrv_set_key(bs, password) < 0)
 227             error("invalid password");
 228     }
 229     return bs;
 230 }
 231
 232 static int img_create(int argc, char **argv)
 233 {
 234     int c, ret, flags;
 235     const char *fmt = "raw";
 236     const char *filename;
 237     const char *base_filename = NULL;
 238     int64_t size;
 239     const char *p;
 240     BlockDriver *drv;
 241
 242     flags = 0;
 243     for(;;) {
 244         c = getopt(argc, argv, "b:f:he6");
 245         if (c == -1)
 246             break;
 247         switch(c) {
 248         case 'h':
 249             help();
 250             break;
 251         case 'b':
 252             base_filename = optarg;
 253             break;
 254         case 'f':
 255             fmt = optarg;
 256             break;
 257         case 'e':
 258             flags |= BLOCK_FLAG_ENCRYPT;
 259             break;
 260         case '6':
 261             flags |= BLOCK_FLAG_COMPAT6;
 262             break;
 263         }
 264     }
 265     if (optind >= argc)
 266         help();
 267     filename = argv[optind++];
 268     size = 0;
 269     if (base_filename) {
 270         BlockDriverState *bs;
 271         bs = bdrv_new_open(base_filename, NULL);
 272         bdrv_get_geometry(bs, &size);
 273         size *= 512;
 274         bdrv_delete(bs);
 275     } else {
 276         if (optind >= argc)
 277             help();
 278         p = argv[optind];
 279         size = strtoul(p, (char **)&p, 0);
 280         if (*p == 'M') {
 281             size *= 1024 * 1024;
 282         } else if (*p == 'G') {
 283             size *= 1024 * 1024 * 1024;
 284         } else if (*p == 'k' || *p == 'K' || *p == '\0') {
 285             size *= 1024;
 286         } else {
 287             help();
 288         }
 289     }
 290     drv = bdrv_find_format(fmt);
 291     if (!drv)
 292         error("Unknown file format '%s'", fmt);
 293     printf("Formatting '%s', fmt=%s",
 294            filename, fmt);
 295     if (flags & BLOCK_FLAG_ENCRYPT)
 296         printf(", encrypted");
 297     if (flags & BLOCK_FLAG_COMPAT6)
 298         printf(", compatibility level=6");
 299     if (base_filename) {
 300         printf(", backing_file=%s",
 301                base_filename);
 302     }
 303     printf(", size=%" PRId64 " kB\n", (int64_t) (size / 1024));
 304     ret = bdrv_create(drv, filename, size / 512, base_filename, flags);
 305     if (ret < 0) {
 306         if (ret == -ENOTSUP) {
 307             error("Formatting or formatting option not supported for file format '%s'", fmt);
 308         } else {
 309             error("Error while formatting");
 310         }
 311     }
 312     return 0;
 313 }
 314
 315 static int img_commit(int argc, char **argv)
 316 {
 317     int c, ret;
 318     const char *filename, *fmt;
 319     BlockDriver *drv;
 320     BlockDriverState *bs;
 321
 322     fmt = NULL;
 323     for(;;) {
 324         c = getopt(argc, argv, "f:h");
 325         if (c == -1)
 326             break;
 327         switch(c) {
 328         case 'h':
 329             help();
 330             break;
 331         case 'f':
 332             fmt = optarg;
 333             break;
 334         }
 335     }
 336     if (optind >= argc)
 337         help();
 338     filename = argv[optind++];
 339
 340     bs = bdrv_new("");
 341     if (!bs)
 342         error("Not enough memory");
 343     if (fmt) {
 344         drv = bdrv_find_format(fmt);
 345         if (!drv)
 346             error("Unknown file format '%s'", fmt);
 347     } else {
 348         drv = NULL;
 349     }
 350     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 351         error("Could not open '%s'", filename);
 352     }
 353     ret = bdrv_commit(bs);
 354     switch(ret) {
 355     case 0:
 356         printf("Image committed.\n");
 357         break;
 358     case -ENOENT:
 359         error("No disk inserted");
 360         break;
 361     case -EACCES:
 362         error("Image is read-only");
 363         break;
 364     case -ENOTSUP:
 365         error("Image is already committed");
 366         break;
 367     default:
 368         error("Error while committing image");
 369         break;
 370     }
 371
 372     bdrv_delete(bs);
 373     return 0;
 374 }
 375
 376 static int is_not_zero(const uint8_t *sector, int len)
 377 {
 378     int i;
 379     len >>= 2;
 380     for(i = 0;i < len; i++) {
 381         if (((uint32_t *)sector)[i] != 0)
 382             return 1;
 383     }
 384     return 0;
 385 }
 386
 387 static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
 388 {
 389     int v, i;
 390
 391     if (n <= 0) {
 392         *pnum = 0;
 393         return 0;
 394     }
 395     v = is_not_zero(buf, 512);
 396     for(i = 1; i < n; i++) {
 397         buf += 512;
 398         if (v != is_not_zero(buf, 512))
 399             break;
 400     }
 401     *pnum = i;
 402     return v;
 403 }
 404
 405 #define IO_BUF_SIZE 65536
 406
 407 static int img_convert(int argc, char **argv)
 408 {
 409     int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
 410     const char *fmt, *out_fmt, *out_filename;
 411     BlockDriver *drv;
 412     BlockDriverState **bs, *out_bs;
 413     int64_t total_sectors, nb_sectors, sector_num, bs_offset, bs_sectors;
 414     uint8_t buf[IO_BUF_SIZE];
 415     const uint8_t *buf1;
 416     BlockDriverInfo bdi;
 417
 418     fmt = NULL;
 419     out_fmt = "raw";
 420     flags = 0;
 421     for(;;) {
 422         c = getopt(argc, argv, "f:O:hce6");
 423         if (c == -1)
 424             break;
 425         switch(c) {
 426         case 'h':
 427             help();
 428             break;
 429         case 'f':
 430             fmt = optarg;
 431             break;
 432         case 'O':
 433             out_fmt = optarg;
 434             break;
 435         case 'c':
 436             flags |= BLOCK_FLAG_COMPRESS;
 437             break;
 438         case 'e':
 439             flags |= BLOCK_FLAG_ENCRYPT;
 440             break;
 441         case '6':
 442             flags |= BLOCK_FLAG_COMPAT6;
 443             break;
 444         }
 445     }
 446
 447     bs_n = argc - optind - 1;
 448     if (bs_n < 1) help();
 449
 450     out_filename = argv[argc - 1];
 451
 452     bs = calloc(bs_n, sizeof(BlockDriverState *));
 453     if (!bs)
 454         error("Out of memory");
 455
 456     total_sectors = 0;
 457     for (bs_i = 0; bs_i < bs_n; bs_i++) {
 458         bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);
 459         if (!bs[bs_i])
 460             error("Could not open '%s'", argv[optind + bs_i]);
 461         bdrv_get_geometry(bs[bs_i], &bs_sectors);
 462         total_sectors += bs_sectors;
 463     }
 464
 465     drv = bdrv_find_format(out_fmt);
 466     if (!drv)
 467         error("Unknown file format '%s'", out_fmt);
 468     if (flags & BLOCK_FLAG_COMPRESS && drv != &bdrv_qcow && drv != &bdrv_qcow2)
 469         error("Compression not supported for this file format");
 470     if (flags & BLOCK_FLAG_ENCRYPT && drv != &bdrv_qcow && drv != &bdrv_qcow2)
 471         error("Encryption not supported for this file format");
 472     if (flags & BLOCK_FLAG_COMPAT6 && drv != &bdrv_vmdk)
 473         error("Alternative compatibility level not supported for this file format");
 474     if (flags & BLOCK_FLAG_ENCRYPT && flags & BLOCK_FLAG_COMPRESS)
 475         error("Compression and encryption not supported at the same time");
 476
 477     ret = bdrv_create(drv, out_filename, total_sectors, NULL, flags);
 478     if (ret < 0) {
 479         if (ret == -ENOTSUP) {
 480             error("Formatting not supported for file format '%s'", fmt);
 481         } else {
 482             error("Error while formatting '%s'", out_filename);
 483         }
 484     }
 485
 486     out_bs = bdrv_new_open(out_filename, out_fmt);
 487
 488     bs_i = 0;
 489     bs_offset = 0;
 490     bdrv_get_geometry(bs[0], &bs_sectors);
 491
 492     if (flags & BLOCK_FLAG_COMPRESS) {
 493         if (bdrv_get_info(out_bs, &bdi) < 0)
 494             error("could not get block driver info");
 495         cluster_size = bdi.cluster_size;
 496         if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
 497             error("invalid cluster size");
 498         cluster_sectors = cluster_size >> 9;
 499         sector_num = 0;
 500         for(;;) {
 501             int64_t bs_num;
 502             int remainder;
 503             uint8_t *buf2;
 504
 505             nb_sectors = total_sectors - sector_num;
 506             if (nb_sectors <= 0)
 507                 break;
 508             if (nb_sectors >= cluster_sectors)
 509                 n = cluster_sectors;
 510             else
 511                 n = nb_sectors;
 512
 513             bs_num = sector_num - bs_offset;
 514             assert (bs_num >= 0);
 515             remainder = n;
 516             buf2 = buf;
 517             while (remainder > 0) {
 518                 int nlow;
 519                 while (bs_num == bs_sectors) {
 520                     bs_i++;
 521                     assert (bs_i < bs_n);
 522                     bs_offset += bs_sectors;
 523                     bdrv_get_geometry(bs[bs_i], &bs_sectors);
 524                     bs_num = 0;
 525                     /* printf("changing part: sector_num=%lld, "
 526                        "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
 527                        sector_num, bs_i, bs_offset, bs_sectors); */
 528                 }
 529                 assert (bs_num < bs_sectors);
 530
 531                 nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;
 532
 533                 if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0)
 534                     error("error while reading");
 535
 536                 buf2 += nlow * 512;
 537                 bs_num += nlow;
 538
 539                 remainder -= nlow;
 540             }
 541             assert (remainder == 0);
 542
 543             if (n < cluster_sectors)
 544                 memset(buf + n * 512, 0, cluster_size - n * 512);
 545             if (is_not_zero(buf, cluster_size)) {
 546                 if (bdrv_write_compressed(out_bs, sector_num, buf,
 547                                           cluster_sectors) != 0)
 548                     error("error while compressing sector %" PRId64,
 549                           sector_num);
 550             }
 551             sector_num += n;
 552         }
 553         /* signal EOF to align */
 554         bdrv_write_compressed(out_bs, 0, NULL, 0);
 555     } else {
 556         sector_num = 0;
 557         for(;;) {
 558             nb_sectors = total_sectors - sector_num;
 559             if (nb_sectors <= 0)
 560                 break;
 561             if (nb_sectors >= (IO_BUF_SIZE / 512))
 562                 n = (IO_BUF_SIZE / 512);
 563             else
 564                 n = nb_sectors;
 565
 566             while (sector_num - bs_offset >= bs_sectors) {
 567                 bs_i ++;
 568                 assert (bs_i < bs_n);
 569                 bs_offset += bs_sectors;
 570                 bdrv_get_geometry(bs[bs_i], &bs_sectors);
 571                 /* printf("changing part: sector_num=%lld, bs_i=%d, "
 572                   "bs_offset=%lld, bs_sectors=%lld\n",
 573                    sector_num, bs_i, bs_offset, bs_sectors); */
 574             }
 575
 576             if (n > bs_offset + bs_sectors - sector_num)
 577                 n = bs_offset + bs_sectors - sector_num;
 578
 579             if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0)
 580                 error("error while reading");
 581             /* NOTE: at the same time we convert, we do not write zero
 582                sectors to have a chance to compress the image. Ideally, we
 583                should add a specific call to have the info to go faster */
 584             buf1 = buf;
 585             while (n > 0) {
 586                 if (is_allocated_sectors(buf1, n, &n1)) {
 587                     if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
 588                         error("error while writing");
 589                 }
 590                 sector_num += n1;
 591                 n -= n1;
 592                 buf1 += n1 * 512;
 593             }
 594         }
 595     }
 596     bdrv_delete(out_bs);
 597     for (bs_i = 0; bs_i < bs_n; bs_i++)
 598         bdrv_delete(bs[bs_i]);
 599     free(bs);
 600     return 0;
 601 }
 602
 603 #ifdef _WIN32
 604 static int64_t get_allocated_file_size(const char *filename)
 605 {
 606     typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
 607     get_compressed_t get_compressed;
 608     struct _stati64 st;
 609
 610     /* WinNT support GetCompressedFileSize to determine allocate size */
 611     get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");
 612     if (get_compressed) {
 613         DWORD high, low;
 614         low = get_compressed(filename, &high);
 615         if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)
 616             return (((int64_t) high) << 32) + low;
 617     }
 618
 619     if (_stati64(filename, &st) < 0)
 620         return -1;
 621     return st.st_size;
 622 }
 623 #else
 624 static int64_t get_allocated_file_size(const char *filename)
 625 {
 626     struct stat st;
 627     if (stat(filename, &st) < 0)
 628         return -1;
 629     return (int64_t)st.st_blocks * 512;
 630 }
 631 #endif
 632
 633 static void dump_snapshots(BlockDriverState *bs)
 634 {
 635     QEMUSnapshotInfo *sn_tab, *sn;
 636     int nb_sns, i;
 637     char buf[256];
 638
 639     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
 640     if (nb_sns <= 0)
 641         return;
 642     printf("Snapshot list:\n");
 643     printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
 644     for(i = 0; i < nb_sns; i++) {
 645         sn = &sn_tab[i];
 646         printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
 647     }
 648     qemu_free(sn_tab);
 649 }
 650
 651 static int img_info(int argc, char **argv)
 652 {
 653     int c;
 654     const char *filename, *fmt;
 655     BlockDriver *drv;
 656     BlockDriverState *bs;
 657     char fmt_name[128], size_buf[128], dsize_buf[128];
 658     int64_t total_sectors, allocated_size;
 659     char backing_filename[1024];
 660     char backing_filename2[1024];
 661     BlockDriverInfo bdi;
 662
 663     fmt = NULL;
 664     for(;;) {
 665         c = getopt(argc, argv, "f:h");
 666         if (c == -1)
 667             break;
 668         switch(c) {
 669         case 'h':
 670             help();
 671             break;
 672         case 'f':
 673             fmt = optarg;
 674             break;
 675         }
 676     }
 677     if (optind >= argc)
 678         help();
 679     filename = argv[optind++];
 680
 681     bs = bdrv_new("");
 682     if (!bs)
 683         error("Not enough memory");
 684     if (fmt) {
 685         drv = bdrv_find_format(fmt);
 686         if (!drv)
 687             error("Unknown file format '%s'", fmt);
 688     } else {
 689         drv = NULL;
 690     }
 691     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 692         error("Could not open '%s'", filename);
 693     }
 694     bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
 695     bdrv_get_geometry(bs, &total_sectors);
 696     get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
 697     allocated_size = get_allocated_file_size(filename);
 698     if (allocated_size < 0)
 699         sprintf(dsize_buf, "unavailable");
 700     else
 701         get_human_readable_size(dsize_buf, sizeof(dsize_buf),
 702                                 allocated_size);
 703     printf("image: %s\n"
 704            "file format: %s\n"
 705            "virtual size: %s (%" PRId64 " bytes)\n"
 706            "disk size: %s\n",
 707            filename, fmt_name, size_buf,
 708            (total_sectors * 512),
 709            dsize_buf);
 710     if (bdrv_is_encrypted(bs))
 711         printf("encrypted: yes\n");
 712     if (bdrv_get_info(bs, &bdi) >= 0) {
 713         if (bdi.cluster_size != 0)
 714             printf("cluster_size: %d\n", bdi.cluster_size);
 715     }
 716     bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
 717     if (backing_filename[0] != '\0') {
 718         path_combine(backing_filename2, sizeof(backing_filename2),
 719                      filename, backing_filename);
 720         printf("backing file: %s (actual path: %s)\n",
 721                backing_filename,
 722                backing_filename2);
 723     }
 724     dump_snapshots(bs);
 725     bdrv_delete(bs);
 726     return 0;
 727 }
 728
 729 int main(int argc, char **argv)
 730 {
 731     const char *cmd;
 732
 733     bdrv_init();
 734     if (argc < 2)
 735         help();
 736     cmd = argv[1];
 737     optind++;
 738     if (!strcmp(cmd, "create")) {
 739         img_create(argc, argv);
 740     } else if (!strcmp(cmd, "commit")) {
 741         img_commit(argc, argv);
 742     } else if (!strcmp(cmd, "convert")) {
 743         img_convert(argc, argv);
 744     } else if (!strcmp(cmd, "info")) {
 745         img_info(argc, argv);
 746     } else {
 747         help();
 748     }
 749     return 0;
 750 }