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 void *get_mmap_addr(unsigned long size)
  34 {
  35     return NULL;
  36 }
  37
  38 void qemu_free(void *ptr)
  39 {
  40     free(ptr);
  41 }
  42
  43 void *qemu_malloc(size_t size)
  44 {
  45     return malloc(size);
  46 }
  47
  48 void *qemu_mallocz(size_t size)
  49 {
  50     void *ptr;
  51     ptr = qemu_malloc(size);
  52     if (!ptr)
  53         return NULL;
  54     memset(ptr, 0, size);
  55     return ptr;
  56 }
  57
  58 char *qemu_strdup(const char *str)
  59 {
  60     char *ptr;
  61     ptr = qemu_malloc(strlen(str) + 1);
  62     if (!ptr)
  63         return NULL;
  64     strcpy(ptr, str);
  65     return ptr;
  66 }
  67
  68 static void __attribute__((noreturn)) error(const char *fmt, ...)
  69 {
  70     va_list ap;
  71     va_start(ap, fmt);
  72     fprintf(stderr, "qemu-img: ");
  73     vfprintf(stderr, fmt, ap);
  74     fprintf(stderr, "\n");
  75     exit(1);
  76     va_end(ap);
  77 }
  78
  79 static void format_print(void *opaque, const char *name)
  80 {
  81     printf(" %s", name);
  82 }
  83
  84 static void help(void)
  85 {
  86     printf("qemu-img version " QEMU_VERSION ", Copyright (c) 2004-2008 Fabrice Bellard\n"
  87            "usage: qemu-img command [command options]\n"
  88            "QEMU disk image utility\n"
  89            "\n"
  90            "Command syntax:\n"
  91            "  create [-e] [-6] [-b base_image] [-f fmt] filename [size]\n"
  92            "  commit [-f fmt] filename\n"
  93            "  convert [-c] [-e] [-6] [-f fmt] [-O output_fmt] filename [filename2 [...]] output_filename\n"
  94            "  info [-f fmt] filename\n"
  95            "\n"
  96            "Command parameters:\n"
  97            "  'filename' is a disk image filename\n"
  98            "  'base_image' is the read-only disk image which is used as base for a copy on\n"
  99            "    write image; the copy on write image only stores the modified data\n"
 100            "  'fmt' is the disk image format. It is guessed automatically in most cases\n"
 101            "  'size' is the disk image size in kilobytes. Optional suffixes 'M' (megabyte)\n"
 102            "    and 'G' (gigabyte) are supported\n"
 103            "  'output_filename' is the destination disk image filename\n"
 104            "  'output_fmt' is the destination format\n"
 105            "  '-c' indicates that target image must be compressed (qcow format only)\n"
 106            "  '-e' indicates that the target image must be encrypted (qcow format only)\n"
 107            "  '-6' indicates that the target image must use compatibility level 6 (vmdk format only)\n"
 108            );
 109     printf("\nSupported format:");
 110     bdrv_iterate_format(format_print, NULL);
 111     printf("\n");
 112     exit(1);
 113 }
 114
 115 #if defined(WIN32)
 116 /* XXX: put correct support for win32 */
 117 static int read_password(char *buf, int buf_size)
 118 {
 119     int c, i;
 120     printf("Password: ");
 121     fflush(stdout);
 122     i = 0;
 123     for(;;) {
 124         c = getchar();
 125         if (c == '\n')
 126             break;
 127         if (i < (buf_size - 1))
 128             buf[i++] = c;
 129     }
 130     buf[i] = '\0';
 131     return 0;
 132 }
 133
 134 #else
 135
 136 #include <termios.h>
 137
 138 static struct termios oldtty;
 139
 140 static void term_exit(void)
 141 {
 142     tcsetattr (0, TCSANOW, &oldtty);
 143 }
 144
 145 static void term_init(void)
 146 {
 147     struct termios tty;
 148
 149     tcgetattr (0, &tty);
 150     oldtty = tty;
 151
 152     tty.c_iflag &= ~(IGNBRK|BRKINT|PARMRK|ISTRIP
 153                           |INLCR|IGNCR|ICRNL|IXON);
 154     tty.c_oflag |= OPOST;
 155     tty.c_lflag &= ~(ECHO|ECHONL|ICANON|IEXTEN);
 156     tty.c_cflag &= ~(CSIZE|PARENB);
 157     tty.c_cflag |= CS8;
 158     tty.c_cc[VMIN] = 1;
 159     tty.c_cc[VTIME] = 0;
 160
 161     tcsetattr (0, TCSANOW, &tty);
 162
 163     atexit(term_exit);
 164 }
 165
 166 static int read_password(char *buf, int buf_size)
 167 {
 168     uint8_t ch;
 169     int i, ret;
 170
 171     printf("password: ");
 172     fflush(stdout);
 173     term_init();
 174     i = 0;
 175     for(;;) {
 176         ret = read(0, &ch, 1);
 177         if (ret == -1) {
 178             if (errno == EAGAIN || errno == EINTR) {
 179                 continue;
 180             } else {
 181                 ret = -1;
 182                 break;
 183             }
 184         } else if (ret == 0) {
 185             ret = -1;
 186             break;
 187         } else {
 188             if (ch == '\r') {
 189                 ret = 0;
 190                 break;
 191             }
 192             if (i < (buf_size - 1))
 193                 buf[i++] = ch;
 194         }
 195     }
 196     term_exit();
 197     buf[i] = '\0';
 198     printf("\n");
 199     return ret;
 200 }
 201 #endif
 202
 203 static BlockDriverState *bdrv_new_open(const char *filename,
 204                                        const char *fmt)
 205 {
 206     BlockDriverState *bs;
 207     BlockDriver *drv;
 208     char password[256];
 209
 210     bs = bdrv_new("");
 211     if (!bs)
 212         error("Not enough memory");
 213     if (fmt) {
 214         drv = bdrv_find_format(fmt);
 215         if (!drv)
 216             error("Unknown file format '%s'", fmt);
 217     } else {
 218         drv = NULL;
 219     }
 220     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 221         error("Could not open '%s'", filename);
 222     }
 223     if (bdrv_is_encrypted(bs)) {
 224         printf("Disk image '%s' is encrypted.\n", filename);
 225         if (read_password(password, sizeof(password)) < 0)
 226             error("No password given");
 227         if (bdrv_set_key(bs, password) < 0)
 228             error("invalid password");
 229     }
 230     return bs;
 231 }
 232
 233 static int img_create(int argc, char **argv)
 234 {
 235     int c, ret, flags;
 236     const char *fmt = "raw";
 237     const char *filename;
 238     const char *base_filename = NULL;
 239     uint64_t size;
 240     const char *p;
 241     BlockDriver *drv;
 242
 243     flags = 0;
 244     for(;;) {
 245         c = getopt(argc, argv, "b:f:he6");
 246         if (c == -1)
 247             break;
 248         switch(c) {
 249         case 'h':
 250             help();
 251             break;
 252         case 'b':
 253             base_filename = optarg;
 254             break;
 255         case 'f':
 256             fmt = optarg;
 257             break;
 258         case 'e':
 259             flags |= BLOCK_FLAG_ENCRYPT;
 260             break;
 261         case '6':
 262             flags |= BLOCK_FLAG_COMPAT6;
 263             break;
 264         }
 265     }
 266     if (optind >= argc)
 267         help();
 268     filename = argv[optind++];
 269     size = 0;
 270     if (base_filename) {
 271         BlockDriverState *bs;
 272         bs = bdrv_new_open(base_filename, NULL);
 273         bdrv_get_geometry(bs, &size);
 274         size *= 512;
 275         bdrv_delete(bs);
 276     } else {
 277         if (optind >= argc)
 278             help();
 279         p = argv[optind];
 280         size = strtoul(p, (char **)&p, 0);
 281         if (*p == 'M') {
 282             size *= 1024 * 1024;
 283         } else if (*p == 'G') {
 284             size *= 1024 * 1024 * 1024;
 285         } else if (*p == 'k' || *p == 'K' || *p == '\0') {
 286             size *= 1024;
 287         } else {
 288             help();
 289         }
 290     }
 291     drv = bdrv_find_format(fmt);
 292     if (!drv)
 293         error("Unknown file format '%s'", fmt);
 294     printf("Formatting '%s', fmt=%s",
 295            filename, fmt);
 296     if (flags & BLOCK_FLAG_ENCRYPT)
 297         printf(", encrypted");
 298     if (flags & BLOCK_FLAG_COMPAT6)
 299         printf(", compatibility level=6");
 300     if (base_filename) {
 301         printf(", backing_file=%s",
 302                base_filename);
 303     }
 304     printf(", size=%" PRIu64 " kB\n", size / 1024);
 305     ret = bdrv_create(drv, filename, size / 512, base_filename, flags);
 306     if (ret < 0) {
 307         if (ret == -ENOTSUP) {
 308             error("Formatting or formatting option not supported for file format '%s'", fmt);
 309         } else {
 310             error("Error while formatting");
 311         }
 312     }
 313     return 0;
 314 }
 315
 316 static int img_commit(int argc, char **argv)
 317 {
 318     int c, ret;
 319     const char *filename, *fmt;
 320     BlockDriver *drv;
 321     BlockDriverState *bs;
 322
 323     fmt = NULL;
 324     for(;;) {
 325         c = getopt(argc, argv, "f:h");
 326         if (c == -1)
 327             break;
 328         switch(c) {
 329         case 'h':
 330             help();
 331             break;
 332         case 'f':
 333             fmt = optarg;
 334             break;
 335         }
 336     }
 337     if (optind >= argc)
 338         help();
 339     filename = argv[optind++];
 340
 341     bs = bdrv_new("");
 342     if (!bs)
 343         error("Not enough memory");
 344     if (fmt) {
 345         drv = bdrv_find_format(fmt);
 346         if (!drv)
 347             error("Unknown file format '%s'", fmt);
 348     } else {
 349         drv = NULL;
 350     }
 351     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 352         error("Could not open '%s'", filename);
 353     }
 354     ret = bdrv_commit(bs);
 355     switch(ret) {
 356     case 0:
 357         printf("Image committed.\n");
 358         break;
 359     case -ENOENT:
 360         error("No disk inserted");
 361         break;
 362     case -EACCES:
 363         error("Image is read-only");
 364         break;
 365     case -ENOTSUP:
 366         error("Image is already committed");
 367         break;
 368     default:
 369         error("Error while committing image");
 370         break;
 371     }
 372
 373     bdrv_delete(bs);
 374     return 0;
 375 }
 376
 377 static int is_not_zero(const uint8_t *sector, int len)
 378 {
 379     int i;
 380     len >>= 2;
 381     for(i = 0;i < len; i++) {
 382         if (((uint32_t *)sector)[i] != 0)
 383             return 1;
 384     }
 385     return 0;
 386 }
 387
 388 static int is_allocated_sectors(const uint8_t *buf, int n, int *pnum)
 389 {
 390     int v, i;
 391
 392     if (n <= 0) {
 393         *pnum = 0;
 394         return 0;
 395     }
 396     v = is_not_zero(buf, 512);
 397     for(i = 1; i < n; i++) {
 398         buf += 512;
 399         if (v != is_not_zero(buf, 512))
 400             break;
 401     }
 402     *pnum = i;
 403     return v;
 404 }
 405
 406 #define IO_BUF_SIZE 65536
 407
 408 static int img_convert(int argc, char **argv)
 409 {
 410     int c, ret, n, n1, bs_n, bs_i, flags, cluster_size, cluster_sectors;
 411     const char *fmt, *out_fmt, *out_filename;
 412     BlockDriver *drv;
 413     BlockDriverState **bs, *out_bs;
 414     int64_t total_sectors, nb_sectors, sector_num, bs_offset;
 415     uint64_t bs_sectors;
 416     uint8_t buf[IO_BUF_SIZE];
 417     const uint8_t *buf1;
 418     BlockDriverInfo bdi;
 419
 420     fmt = NULL;
 421     out_fmt = "raw";
 422     flags = 0;
 423     for(;;) {
 424         c = getopt(argc, argv, "f:O:hce6");
 425         if (c == -1)
 426             break;
 427         switch(c) {
 428         case 'h':
 429             help();
 430             break;
 431         case 'f':
 432             fmt = optarg;
 433             break;
 434         case 'O':
 435             out_fmt = optarg;
 436             break;
 437         case 'c':
 438             flags |= BLOCK_FLAG_COMPRESS;
 439             break;
 440         case 'e':
 441             flags |= BLOCK_FLAG_ENCRYPT;
 442             break;
 443         case '6':
 444             flags |= BLOCK_FLAG_COMPAT6;
 445             break;
 446         }
 447     }
 448
 449     bs_n = argc - optind - 1;
 450     if (bs_n < 1) help();
 451
 452     out_filename = argv[argc - 1];
 453
 454     bs = calloc(bs_n, sizeof(BlockDriverState *));
 455     if (!bs)
 456         error("Out of memory");
 457
 458     total_sectors = 0;
 459     for (bs_i = 0; bs_i < bs_n; bs_i++) {
 460         bs[bs_i] = bdrv_new_open(argv[optind + bs_i], fmt);
 461         if (!bs[bs_i])
 462             error("Could not open '%s'", argv[optind + bs_i]);
 463         bdrv_get_geometry(bs[bs_i], &bs_sectors);
 464         total_sectors += bs_sectors;
 465     }
 466
 467     drv = bdrv_find_format(out_fmt);
 468     if (!drv)
 469         error("Unknown file format '%s'", out_fmt);
 470     if (flags & BLOCK_FLAG_COMPRESS && drv != &bdrv_qcow && drv != &bdrv_qcow2)
 471         error("Compression not supported for this file format");
 472     if (flags & BLOCK_FLAG_ENCRYPT && drv != &bdrv_qcow && drv != &bdrv_qcow2)
 473         error("Encryption not supported for this file format");
 474     if (flags & BLOCK_FLAG_COMPAT6 && drv != &bdrv_vmdk)
 475         error("Alternative compatibility level not supported for this file format");
 476     if (flags & BLOCK_FLAG_ENCRYPT && flags & BLOCK_FLAG_COMPRESS)
 477         error("Compression and encryption not supported at the same time");
 478
 479     ret = bdrv_create(drv, out_filename, total_sectors, NULL, flags);
 480     if (ret < 0) {
 481         if (ret == -ENOTSUP) {
 482             error("Formatting not supported for file format '%s'", fmt);
 483         } else {
 484             error("Error while formatting '%s'", out_filename);
 485         }
 486     }
 487
 488     out_bs = bdrv_new_open(out_filename, out_fmt);
 489
 490     bs_i = 0;
 491     bs_offset = 0;
 492     bdrv_get_geometry(bs[0], &bs_sectors);
 493
 494     if (flags & BLOCK_FLAG_COMPRESS) {
 495         if (bdrv_get_info(out_bs, &bdi) < 0)
 496             error("could not get block driver info");
 497         cluster_size = bdi.cluster_size;
 498         if (cluster_size <= 0 || cluster_size > IO_BUF_SIZE)
 499             error("invalid cluster size");
 500         cluster_sectors = cluster_size >> 9;
 501         sector_num = 0;
 502         for(;;) {
 503             int64_t bs_num;
 504             int remainder;
 505             uint8_t *buf2;
 506
 507             nb_sectors = total_sectors - sector_num;
 508             if (nb_sectors <= 0)
 509                 break;
 510             if (nb_sectors >= cluster_sectors)
 511                 n = cluster_sectors;
 512             else
 513                 n = nb_sectors;
 514
 515             bs_num = sector_num - bs_offset;
 516             assert (bs_num >= 0);
 517             remainder = n;
 518             buf2 = buf;
 519             while (remainder > 0) {
 520                 int nlow;
 521                 while (bs_num == bs_sectors) {
 522                     bs_i++;
 523                     assert (bs_i < bs_n);
 524                     bs_offset += bs_sectors;
 525                     bdrv_get_geometry(bs[bs_i], &bs_sectors);
 526                     bs_num = 0;
 527                     /* printf("changing part: sector_num=%lld, "
 528                        "bs_i=%d, bs_offset=%lld, bs_sectors=%lld\n",
 529                        sector_num, bs_i, bs_offset, bs_sectors); */
 530                 }
 531                 assert (bs_num < bs_sectors);
 532
 533                 nlow = (remainder > bs_sectors - bs_num) ? bs_sectors - bs_num : remainder;
 534
 535                 if (bdrv_read(bs[bs_i], bs_num, buf2, nlow) < 0)
 536                     error("error while reading");
 537
 538                 buf2 += nlow * 512;
 539                 bs_num += nlow;
 540
 541                 remainder -= nlow;
 542             }
 543             assert (remainder == 0);
 544
 545             if (n < cluster_sectors)
 546                 memset(buf + n * 512, 0, cluster_size - n * 512);
 547             if (is_not_zero(buf, cluster_size)) {
 548                 if (bdrv_write_compressed(out_bs, sector_num, buf,
 549                                           cluster_sectors) != 0)
 550                     error("error while compressing sector %" PRId64,
 551                           sector_num);
 552             }
 553             sector_num += n;
 554         }
 555         /* signal EOF to align */
 556         bdrv_write_compressed(out_bs, 0, NULL, 0);
 557     } else {
 558         sector_num = 0;
 559         for(;;) {
 560             nb_sectors = total_sectors - sector_num;
 561             if (nb_sectors <= 0)
 562                 break;
 563             if (nb_sectors >= (IO_BUF_SIZE / 512))
 564                 n = (IO_BUF_SIZE / 512);
 565             else
 566                 n = nb_sectors;
 567
 568             while (sector_num - bs_offset >= bs_sectors) {
 569                 bs_i ++;
 570                 assert (bs_i < bs_n);
 571                 bs_offset += bs_sectors;
 572                 bdrv_get_geometry(bs[bs_i], &bs_sectors);
 573                 /* printf("changing part: sector_num=%lld, bs_i=%d, "
 574                   "bs_offset=%lld, bs_sectors=%lld\n",
 575                    sector_num, bs_i, bs_offset, bs_sectors); */
 576             }
 577
 578             if (n > bs_offset + bs_sectors - sector_num)
 579                 n = bs_offset + bs_sectors - sector_num;
 580
 581             if (bdrv_read(bs[bs_i], sector_num - bs_offset, buf, n) < 0)
 582                 error("error while reading");
 583             /* NOTE: at the same time we convert, we do not write zero
 584                sectors to have a chance to compress the image. Ideally, we
 585                should add a specific call to have the info to go faster */
 586             buf1 = buf;
 587             while (n > 0) {
 588                 if (is_allocated_sectors(buf1, n, &n1)) {
 589                     if (bdrv_write(out_bs, sector_num, buf1, n1) < 0)
 590                         error("error while writing");
 591                 }
 592                 sector_num += n1;
 593                 n -= n1;
 594                 buf1 += n1 * 512;
 595             }
 596         }
 597     }
 598     bdrv_delete(out_bs);
 599     for (bs_i = 0; bs_i < bs_n; bs_i++)
 600         bdrv_delete(bs[bs_i]);
 601     free(bs);
 602     return 0;
 603 }
 604
 605 #ifdef _WIN32
 606 static int64_t get_allocated_file_size(const char *filename)
 607 {
 608     typedef DWORD (WINAPI * get_compressed_t)(const char *filename, DWORD *high);
 609     get_compressed_t get_compressed;
 610     struct _stati64 st;
 611
 612     /* WinNT support GetCompressedFileSize to determine allocate size */
 613     get_compressed = (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"), "GetCompressedFileSizeA");
 614     if (get_compressed) {
 615         DWORD high, low;
 616         low = get_compressed(filename, &high);
 617         if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR)
 618             return (((int64_t) high) << 32) + low;
 619     }
 620
 621     if (_stati64(filename, &st) < 0)
 622         return -1;
 623     return st.st_size;
 624 }
 625 #else
 626 static int64_t get_allocated_file_size(const char *filename)
 627 {
 628     struct stat st;
 629     if (stat(filename, &st) < 0)
 630         return -1;
 631     return (int64_t)st.st_blocks * 512;
 632 }
 633 #endif
 634
 635 static void dump_snapshots(BlockDriverState *bs)
 636 {
 637     QEMUSnapshotInfo *sn_tab, *sn;
 638     int nb_sns, i;
 639     char buf[256];
 640
 641     nb_sns = bdrv_snapshot_list(bs, &sn_tab);
 642     if (nb_sns <= 0)
 643         return;
 644     printf("Snapshot list:\n");
 645     printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), NULL));
 646     for(i = 0; i < nb_sns; i++) {
 647         sn = &sn_tab[i];
 648         printf("%s\n", bdrv_snapshot_dump(buf, sizeof(buf), sn));
 649     }
 650     qemu_free(sn_tab);
 651 }
 652
 653 static int img_info(int argc, char **argv)
 654 {
 655     int c;
 656     const char *filename, *fmt;
 657     BlockDriver *drv;
 658     BlockDriverState *bs;
 659     char fmt_name[128], size_buf[128], dsize_buf[128];
 660     uint64_t total_sectors;
 661     int64_t allocated_size;
 662     char backing_filename[1024];
 663     char backing_filename2[1024];
 664     BlockDriverInfo bdi;
 665
 666     fmt = NULL;
 667     for(;;) {
 668         c = getopt(argc, argv, "f:h");
 669         if (c == -1)
 670             break;
 671         switch(c) {
 672         case 'h':
 673             help();
 674             break;
 675         case 'f':
 676             fmt = optarg;
 677             break;
 678         }
 679     }
 680     if (optind >= argc)
 681         help();
 682     filename = argv[optind++];
 683
 684     bs = bdrv_new("");
 685     if (!bs)
 686         error("Not enough memory");
 687     if (fmt) {
 688         drv = bdrv_find_format(fmt);
 689         if (!drv)
 690             error("Unknown file format '%s'", fmt);
 691     } else {
 692         drv = NULL;
 693     }
 694     if (bdrv_open2(bs, filename, 0, drv) < 0) {
 695         error("Could not open '%s'", filename);
 696     }
 697     bdrv_get_format(bs, fmt_name, sizeof(fmt_name));
 698     bdrv_get_geometry(bs, &total_sectors);
 699     get_human_readable_size(size_buf, sizeof(size_buf), total_sectors * 512);
 700     allocated_size = get_allocated_file_size(filename);
 701     if (allocated_size < 0)
 702         sprintf(dsize_buf, "unavailable");
 703     else
 704         get_human_readable_size(dsize_buf, sizeof(dsize_buf),
 705                                 allocated_size);
 706     printf("image: %s\n"
 707            "file format: %s\n"
 708            "virtual size: %s (%" PRId64 " bytes)\n"
 709            "disk size: %s\n",
 710            filename, fmt_name, size_buf,
 711            (total_sectors * 512),
 712            dsize_buf);
 713     if (bdrv_is_encrypted(bs))
 714         printf("encrypted: yes\n");
 715     if (bdrv_get_info(bs, &bdi) >= 0) {
 716         if (bdi.cluster_size != 0)
 717             printf("cluster_size: %d\n", bdi.cluster_size);
 718     }
 719     bdrv_get_backing_filename(bs, backing_filename, sizeof(backing_filename));
 720     if (backing_filename[0] != '\0') {
 721         path_combine(backing_filename2, sizeof(backing_filename2),
 722                      filename, backing_filename);
 723         printf("backing file: %s (actual path: %s)\n",
 724                backing_filename,
 725                backing_filename2);
 726     }
 727     dump_snapshots(bs);
 728     bdrv_delete(bs);
 729     return 0;
 730 }
 731
 732 int main(int argc, char **argv)
 733 {
 734     const char *cmd;
 735
 736     bdrv_init();
 737     if (argc < 2)
 738         help();
 739     cmd = argv[1];
 740     optind++;
 741     if (!strcmp(cmd, "create")) {
 742         img_create(argc, argv);
 743     } else if (!strcmp(cmd, "commit")) {
 744         img_commit(argc, argv);
 745     } else if (!strcmp(cmd, "convert")) {
 746         img_convert(argc, argv);
 747     } else if (!strcmp(cmd, "info")) {
 748         img_info(argc, argv);
 749     } else {
 750         help();
 751     }
 752     return 0;
 753 }