block.c

   1 /*
   2  * QEMU System Emulator block driver
   3  *
   4  * Copyright (c) 2003 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 #ifndef QEMU_IMG
  26 #include "console.h"
  27 #endif
  28 #include "block_int.h"
  29
  30 #ifdef _BSD
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <sys/ioctl.h>
  34 #include <sys/queue.h>
  35 #include <sys/disk.h>
  36 #endif
  37
  38 #define SECTOR_BITS 9
  39 #define SECTOR_SIZE (1 << SECTOR_BITS)
  40
  41 typedef struct BlockDriverAIOCBSync {
  42     BlockDriverAIOCB common;
  43     QEMUBH *bh;
  44     int ret;
  45 } BlockDriverAIOCBSync;
  46
  47 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
  48         int64_t sector_num, uint8_t *buf, int nb_sectors,
  49         BlockDriverCompletionFunc *cb, void *opaque);
  50 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
  51         int64_t sector_num, const uint8_t *buf, int nb_sectors,
  52         BlockDriverCompletionFunc *cb, void *opaque);
  53 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb);
  54 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
  55                         uint8_t *buf, int nb_sectors);
  56 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
  57                          const uint8_t *buf, int nb_sectors);
  58
  59 BlockDriverState *bdrv_first;
  60 static BlockDriver *first_drv;
  61
  62 int path_is_absolute(const char *path)
  63 {
  64     const char *p;
  65 #ifdef _WIN32
  66     /* specific case for names like: "\\.\d:" */
  67     if (*path == '/' || *path == '\\')
  68         return 1;
  69 #endif
  70     p = strchr(path, ':');
  71     if (p)
  72         p++;
  73     else
  74         p = path;
  75 #ifdef _WIN32
  76     return (*p == '/' || *p == '\\');
  77 #else
  78     return (*p == '/');
  79 #endif
  80 }
  81
  82 /* if filename is absolute, just copy it to dest. Otherwise, build a
  83    path to it by considering it is relative to base_path. URL are
  84    supported. */
  85 void path_combine(char *dest, int dest_size,
  86                   const char *base_path,
  87                   const char *filename)
  88 {
  89     const char *p, *p1;
  90     int len;
  91
  92     if (dest_size <= 0)
  93         return;
  94     if (path_is_absolute(filename)) {
  95         pstrcpy(dest, dest_size, filename);
  96     } else {
  97         p = strchr(base_path, ':');
  98         if (p)
  99             p++;
 100         else
 101             p = base_path;
 102         p1 = strrchr(base_path, '/');
 103 #ifdef _WIN32
 104         {
 105             const char *p2;
 106             p2 = strrchr(base_path, '\\');
 107             if (!p1 || p2 > p1)
 108                 p1 = p2;
 109         }
 110 #endif
 111         if (p1)
 112             p1++;
 113         else
 114             p1 = base_path;
 115         if (p1 > p)
 116             p = p1;
 117         len = p - base_path;
 118         if (len > dest_size - 1)
 119             len = dest_size - 1;
 120         memcpy(dest, base_path, len);
 121         dest[len] = '\0';
 122         pstrcat(dest, dest_size, filename);
 123     }
 124 }
 125
 126
 127 static void bdrv_register(BlockDriver *bdrv)
 128 {
 129     if (!bdrv->bdrv_aio_read) {
 130         /* add AIO emulation layer */
 131         bdrv->bdrv_aio_read = bdrv_aio_read_em;
 132         bdrv->bdrv_aio_write = bdrv_aio_write_em;
 133         bdrv->bdrv_aio_cancel = bdrv_aio_cancel_em;
 134         bdrv->aiocb_size = sizeof(BlockDriverAIOCBSync);
 135     } else if (!bdrv->bdrv_read && !bdrv->bdrv_pread) {
 136         /* add synchronous IO emulation layer */
 137         bdrv->bdrv_read = bdrv_read_em;
 138         bdrv->bdrv_write = bdrv_write_em;
 139     }
 140     bdrv->next = first_drv;
 141     first_drv = bdrv;
 142 }
 143
 144 /* create a new block device (by default it is empty) */
 145 BlockDriverState *bdrv_new(const char *device_name)
 146 {
 147     BlockDriverState **pbs, *bs;
 148
 149     bs = qemu_mallocz(sizeof(BlockDriverState));
 150     if(!bs)
 151         return NULL;
 152     pstrcpy(bs->device_name, sizeof(bs->device_name), device_name);
 153     if (device_name[0] != '\0') {
 154         /* insert at the end */
 155         pbs = &bdrv_first;
 156         while (*pbs != NULL)
 157             pbs = &(*pbs)->next;
 158         *pbs = bs;
 159     }
 160     return bs;
 161 }
 162
 163 BlockDriver *bdrv_find_format(const char *format_name)
 164 {
 165     BlockDriver *drv1;
 166     for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
 167         if (!strcmp(drv1->format_name, format_name))
 168             return drv1;
 169     }
 170     return NULL;
 171 }
 172
 173 int bdrv_create(BlockDriver *drv,
 174                 const char *filename, int64_t size_in_sectors,
 175                 const char *backing_file, int flags)
 176 {
 177     if (!drv->bdrv_create)
 178         return -ENOTSUP;
 179     return drv->bdrv_create(filename, size_in_sectors, backing_file, flags);
 180 }
 181
 182 #ifdef _WIN32
 183 void get_tmp_filename(char *filename, int size)
 184 {
 185     char temp_dir[MAX_PATH];
 186
 187     GetTempPath(MAX_PATH, temp_dir);
 188     GetTempFileName(temp_dir, "qem", 0, filename);
 189 }
 190 #else
 191 void get_tmp_filename(char *filename, int size)
 192 {
 193     int fd;
 194     char *tmpdir;
 195     /* XXX: race condition possible */
 196     tmpdir = getenv("TMPDIR");
 197     if (!tmpdir)
 198         tmpdir = "/tmp";
 199     snprintf(filename, size, "%s/vl.XXXXXX", tmpdir);
 200     fd = mkstemp(filename);
 201     close(fd);
 202 }
 203 #endif
 204
 205 #ifdef _WIN32
 206 static int is_windows_drive_prefix(const char *filename)
 207 {
 208     return (((filename[0] >= 'a' && filename[0] <= 'z') ||
 209              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 210             filename[1] == ':');
 211 }
 212
 213 static int is_windows_drive(const char *filename)
 214 {
 215     if (is_windows_drive_prefix(filename) &&
 216         filename[2] == '\0')
 217         return 1;
 218     if (strstart(filename, "\\\\.\\", NULL) ||
 219         strstart(filename, "//./", NULL))
 220         return 1;
 221     return 0;
 222 }
 223 #endif
 224
 225 static BlockDriver *find_protocol(const char *filename)
 226 {
 227     BlockDriver *drv1;
 228     char protocol[128];
 229     int len;
 230     const char *p;
 231
 232 #ifdef _WIN32
 233     if (is_windows_drive(filename) ||
 234         is_windows_drive_prefix(filename))
 235         return &bdrv_raw;
 236 #endif
 237     p = strchr(filename, ':');
 238     if (!p)
 239         return &bdrv_raw;
 240     len = p - filename;
 241     if (len > sizeof(protocol) - 1)
 242         len = sizeof(protocol) - 1;
 243     memcpy(protocol, filename, len);
 244     protocol[len] = '\0';
 245     for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
 246         if (drv1->protocol_name &&
 247             !strcmp(drv1->protocol_name, protocol))
 248             return drv1;
 249     }
 250     return NULL;
 251 }
 252
 253 /* XXX: force raw format if block or character device ? It would
 254    simplify the BSD case */
 255 static BlockDriver *find_image_format(const char *filename)
 256 {
 257     int ret, score, score_max;
 258     BlockDriver *drv1, *drv;
 259     uint8_t buf[2048];
 260     BlockDriverState *bs;
 261
 262     /* detect host devices. By convention, /dev/cdrom[N] is always
 263        recognized as a host CDROM */
 264     if (strstart(filename, "/dev/cdrom", NULL))
 265         return &bdrv_host_device;
 266 #ifdef _WIN32
 267     if (is_windows_drive(filename))
 268         return &bdrv_host_device;
 269 #else
 270     {
 271         struct stat st;
 272         if (stat(filename, &st) >= 0 &&
 273             (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
 274             return &bdrv_host_device;
 275         }
 276     }
 277 #endif
 278
 279     drv = find_protocol(filename);
 280     /* no need to test disk image formats for vvfat */
 281     if (drv == &bdrv_vvfat)
 282         return drv;
 283
 284     ret = bdrv_file_open(&bs, filename, BDRV_O_RDONLY);
 285     if (ret < 0)
 286         return NULL;
 287     ret = bdrv_pread(bs, 0, buf, sizeof(buf));
 288     bdrv_delete(bs);
 289     if (ret < 0) {
 290         return NULL;
 291     }
 292
 293     score_max = 0;
 294     for(drv1 = first_drv; drv1 != NULL; drv1 = drv1->next) {
 295         if (drv1->bdrv_probe) {
 296             score = drv1->bdrv_probe(buf, ret, filename);
 297             if (score > score_max) {
 298                 score_max = score;
 299                 drv = drv1;
 300             }
 301         }
 302     }
 303     return drv;
 304 }
 305
 306 int bdrv_file_open(BlockDriverState **pbs, const char *filename, int flags)
 307 {
 308     BlockDriverState *bs;
 309     int ret;
 310
 311     bs = bdrv_new("");
 312     if (!bs)
 313         return -ENOMEM;
 314     ret = bdrv_open2(bs, filename, flags | BDRV_O_FILE, NULL);
 315     if (ret < 0) {
 316         bdrv_delete(bs);
 317         return ret;
 318     }
 319     *pbs = bs;
 320     return 0;
 321 }
 322
 323 int bdrv_open(BlockDriverState *bs, const char *filename, int flags)
 324 {
 325     return bdrv_open2(bs, filename, flags, NULL);
 326 }
 327
 328 int bdrv_open2(BlockDriverState *bs, const char *filename, int flags,
 329                BlockDriver *drv)
 330 {
 331     int ret, open_flags;
 332     char tmp_filename[PATH_MAX];
 333     char backing_filename[PATH_MAX];
 334
 335     bs->read_only = 0;
 336     bs->is_temporary = 0;
 337     bs->encrypted = 0;
 338
 339     if (flags & BDRV_O_SNAPSHOT) {
 340         BlockDriverState *bs1;
 341         int64_t total_size;
 342
 343         /* if snapshot, we create a temporary backing file and open it
 344            instead of opening 'filename' directly */
 345
 346         /* if there is a backing file, use it */
 347         bs1 = bdrv_new("");
 348         if (!bs1) {
 349             return -ENOMEM;
 350         }
 351         if (bdrv_open(bs1, filename, 0) < 0) {
 352             bdrv_delete(bs1);
 353             return -1;
 354         }
 355         total_size = bdrv_getlength(bs1) >> SECTOR_BITS;
 356         bdrv_delete(bs1);
 357
 358         get_tmp_filename(tmp_filename, sizeof(tmp_filename));
 359         realpath(filename, backing_filename);
 360         if (bdrv_create(&bdrv_qcow2, tmp_filename,
 361                         total_size, backing_filename, 0) < 0) {
 362             return -1;
 363         }
 364         filename = tmp_filename;
 365         bs->is_temporary = 1;
 366     }
 367
 368     pstrcpy(bs->filename, sizeof(bs->filename), filename);
 369     if (flags & BDRV_O_FILE) {
 370         drv = find_protocol(filename);
 371         if (!drv)
 372             return -ENOENT;
 373     } else {
 374         if (!drv) {
 375             drv = find_image_format(filename);
 376             if (!drv)
 377                 return -1;
 378         }
 379     }
 380     bs->drv = drv;
 381     bs->opaque = qemu_mallocz(drv->instance_size);
 382     if (bs->opaque == NULL && drv->instance_size > 0)
 383         return -1;
 384     /* Note: for compatibility, we open disk image files as RDWR, and
 385        RDONLY as fallback */
 386     if (!(flags & BDRV_O_FILE))
 387         open_flags = BDRV_O_RDWR | (flags & BDRV_O_DIRECT);
 388     else
 389         open_flags = flags & ~(BDRV_O_FILE | BDRV_O_SNAPSHOT);
 390     ret = drv->bdrv_open(bs, filename, open_flags);
 391     if (ret == -EACCES && !(flags & BDRV_O_FILE)) {
 392         ret = drv->bdrv_open(bs, filename, BDRV_O_RDONLY);
 393         bs->read_only = 1;
 394     }
 395     if (ret < 0) {
 396         qemu_free(bs->opaque);
 397         bs->opaque = NULL;
 398         bs->drv = NULL;
 399         return ret;
 400     }
 401     if (drv->bdrv_getlength) {
 402         bs->total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
 403     }
 404 #ifndef _WIN32
 405     if (bs->is_temporary) {
 406         unlink(filename);
 407     }
 408 #endif
 409     if (bs->backing_file[0] != '\0') {
 410         /* if there is a backing file, use it */
 411         bs->backing_hd = bdrv_new("");
 412         if (!bs->backing_hd) {
 413         fail:
 414             bdrv_close(bs);
 415             return -ENOMEM;
 416         }
 417         path_combine(backing_filename, sizeof(backing_filename),
 418                      filename, bs->backing_file);
 419         if (bdrv_open(bs->backing_hd, backing_filename, 0) < 0)
 420             goto fail;
 421     }
 422
 423     /* call the change callback */
 424     bs->media_changed = 1;
 425     if (bs->change_cb)
 426         bs->change_cb(bs->change_opaque);
 427
 428     return 0;
 429 }
 430
 431 void bdrv_close(BlockDriverState *bs)
 432 {
 433     if (bs->drv) {
 434         if (bs->backing_hd)
 435             bdrv_delete(bs->backing_hd);
 436         bs->drv->bdrv_close(bs);
 437         qemu_free(bs->opaque);
 438 #ifdef _WIN32
 439         if (bs->is_temporary) {
 440             unlink(bs->filename);
 441         }
 442 #endif
 443         bs->opaque = NULL;
 444         bs->drv = NULL;
 445
 446         /* call the change callback */
 447         bs->media_changed = 1;
 448         if (bs->change_cb)
 449             bs->change_cb(bs->change_opaque);
 450     }
 451 }
 452
 453 void bdrv_delete(BlockDriverState *bs)
 454 {
 455     /* XXX: remove the driver list */
 456     bdrv_close(bs);
 457     qemu_free(bs);
 458 }
 459
 460 /* commit COW file into the raw image */
 461 int bdrv_commit(BlockDriverState *bs)
 462 {
 463     BlockDriver *drv = bs->drv;
 464     int64_t i, total_sectors;
 465     int n, j;
 466     unsigned char sector[512];
 467
 468     if (!drv)
 469         return -ENOMEDIUM;
 470
 471     if (bs->read_only) {
 472         return -EACCES;
 473     }
 474
 475     if (!bs->backing_hd) {
 476         return -ENOTSUP;
 477     }
 478
 479     total_sectors = bdrv_getlength(bs) >> SECTOR_BITS;
 480     for (i = 0; i < total_sectors;) {
 481         if (drv->bdrv_is_allocated(bs, i, 65536, &n)) {
 482             for(j = 0; j < n; j++) {
 483                 if (bdrv_read(bs, i, sector, 1) != 0) {
 484                     return -EIO;
 485                 }
 486
 487                 if (bdrv_write(bs->backing_hd, i, sector, 1) != 0) {
 488                     return -EIO;
 489                 }
 490                 i++;
 491             }
 492         } else {
 493             i += n;
 494         }
 495     }
 496
 497     if (drv->bdrv_make_empty)
 498         return drv->bdrv_make_empty(bs);
 499
 500     return 0;
 501 }
 502
 503 /* return < 0 if error. See bdrv_write() for the return codes */
 504 int bdrv_read(BlockDriverState *bs, int64_t sector_num,
 505               uint8_t *buf, int nb_sectors)
 506 {
 507     BlockDriver *drv = bs->drv;
 508
 509     if (!drv)
 510         return -ENOMEDIUM;
 511
 512     if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
 513             memcpy(buf, bs->boot_sector_data, 512);
 514         sector_num++;
 515         nb_sectors--;
 516         buf += 512;
 517         if (nb_sectors == 0)
 518             return 0;
 519     }
 520     if (drv->bdrv_pread) {
 521         int ret, len;
 522         len = nb_sectors * 512;
 523         ret = drv->bdrv_pread(bs, sector_num * 512, buf, len);
 524         if (ret < 0)
 525             return ret;
 526         else if (ret != len)
 527             return -EINVAL;
 528         else {
 529             bs->rd_bytes += (unsigned) len;
 530             bs->rd_ops ++;
 531             return 0;
 532         }
 533     } else {
 534         return drv->bdrv_read(bs, sector_num, buf, nb_sectors);
 535     }
 536 }
 537
 538 /* Return < 0 if error. Important errors are:
 539   -EIO         generic I/O error (may happen for all errors)
 540   -ENOMEDIUM   No media inserted.
 541   -EINVAL      Invalid sector number or nb_sectors
 542   -EACCES      Trying to write a read-only device
 543 */
 544 int bdrv_write(BlockDriverState *bs, int64_t sector_num,
 545                const uint8_t *buf, int nb_sectors)
 546 {
 547     BlockDriver *drv = bs->drv;
 548     if (!bs->drv)
 549         return -ENOMEDIUM;
 550     if (bs->read_only)
 551         return -EACCES;
 552     if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
 553         memcpy(bs->boot_sector_data, buf, 512);
 554     }
 555     if (drv->bdrv_pwrite) {
 556         int ret, len;
 557         len = nb_sectors * 512;
 558         ret = drv->bdrv_pwrite(bs, sector_num * 512, buf, len);
 559         if (ret < 0)
 560             return ret;
 561         else if (ret != len)
 562             return -EIO;
 563         else {
 564             bs->wr_bytes += (unsigned) len;
 565             bs->wr_ops ++;
 566             return 0;
 567         }
 568     } else {
 569         return drv->bdrv_write(bs, sector_num, buf, nb_sectors);
 570     }
 571 }
 572
 573 static int bdrv_pread_em(BlockDriverState *bs, int64_t offset,
 574                          uint8_t *buf, int count1)
 575 {
 576     uint8_t tmp_buf[SECTOR_SIZE];
 577     int len, nb_sectors, count;
 578     int64_t sector_num;
 579
 580     count = count1;
 581     /* first read to align to sector start */
 582     len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
 583     if (len > count)
 584         len = count;
 585     sector_num = offset >> SECTOR_BITS;
 586     if (len > 0) {
 587         if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
 588             return -EIO;
 589         memcpy(buf, tmp_buf + (offset & (SECTOR_SIZE - 1)), len);
 590         count -= len;
 591         if (count == 0)
 592             return count1;
 593         sector_num++;
 594         buf += len;
 595     }
 596
 597     /* read the sectors "in place" */
 598     nb_sectors = count >> SECTOR_BITS;
 599     if (nb_sectors > 0) {
 600         if (bdrv_read(bs, sector_num, buf, nb_sectors) < 0)
 601             return -EIO;
 602         sector_num += nb_sectors;
 603         len = nb_sectors << SECTOR_BITS;
 604         buf += len;
 605         count -= len;
 606     }
 607
 608     /* add data from the last sector */
 609     if (count > 0) {
 610         if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
 611             return -EIO;
 612         memcpy(buf, tmp_buf, count);
 613     }
 614     return count1;
 615 }
 616
 617 static int bdrv_pwrite_em(BlockDriverState *bs, int64_t offset,
 618                           const uint8_t *buf, int count1)
 619 {
 620     uint8_t tmp_buf[SECTOR_SIZE];
 621     int len, nb_sectors, count;
 622     int64_t sector_num;
 623
 624     count = count1;
 625     /* first write to align to sector start */
 626     len = (SECTOR_SIZE - offset) & (SECTOR_SIZE - 1);
 627     if (len > count)
 628         len = count;
 629     sector_num = offset >> SECTOR_BITS;
 630     if (len > 0) {
 631         if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
 632             return -EIO;
 633         memcpy(tmp_buf + (offset & (SECTOR_SIZE - 1)), buf, len);
 634         if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
 635             return -EIO;
 636         count -= len;
 637         if (count == 0)
 638             return count1;
 639         sector_num++;
 640         buf += len;
 641     }
 642
 643     /* write the sectors "in place" */
 644     nb_sectors = count >> SECTOR_BITS;
 645     if (nb_sectors > 0) {
 646         if (bdrv_write(bs, sector_num, buf, nb_sectors) < 0)
 647             return -EIO;
 648         sector_num += nb_sectors;
 649         len = nb_sectors << SECTOR_BITS;
 650         buf += len;
 651         count -= len;
 652     }
 653
 654     /* add data from the last sector */
 655     if (count > 0) {
 656         if (bdrv_read(bs, sector_num, tmp_buf, 1) < 0)
 657             return -EIO;
 658         memcpy(tmp_buf, buf, count);
 659         if (bdrv_write(bs, sector_num, tmp_buf, 1) < 0)
 660             return -EIO;
 661     }
 662     return count1;
 663 }
 664
 665 /**
 666  * Read with byte offsets (needed only for file protocols)
 667  */
 668 int bdrv_pread(BlockDriverState *bs, int64_t offset,
 669                void *buf1, int count1)
 670 {
 671     BlockDriver *drv = bs->drv;
 672
 673     if (!drv)
 674         return -ENOMEDIUM;
 675     if (!drv->bdrv_pread)
 676         return bdrv_pread_em(bs, offset, buf1, count1);
 677     return drv->bdrv_pread(bs, offset, buf1, count1);
 678 }
 679
 680 /**
 681  * Write with byte offsets (needed only for file protocols)
 682  */
 683 int bdrv_pwrite(BlockDriverState *bs, int64_t offset,
 684                 const void *buf1, int count1)
 685 {
 686     BlockDriver *drv = bs->drv;
 687
 688     if (!drv)
 689         return -ENOMEDIUM;
 690     if (!drv->bdrv_pwrite)
 691         return bdrv_pwrite_em(bs, offset, buf1, count1);
 692     return drv->bdrv_pwrite(bs, offset, buf1, count1);
 693 }
 694
 695 /**
 696  * Truncate file to 'offset' bytes (needed only for file protocols)
 697  */
 698 int bdrv_truncate(BlockDriverState *bs, int64_t offset)
 699 {
 700     BlockDriver *drv = bs->drv;
 701     if (!drv)
 702         return -ENOMEDIUM;
 703     if (!drv->bdrv_truncate)
 704         return -ENOTSUP;
 705     return drv->bdrv_truncate(bs, offset);
 706 }
 707
 708 /**
 709  * Length of a file in bytes. Return < 0 if error or unknown.
 710  */
 711 int64_t bdrv_getlength(BlockDriverState *bs)
 712 {
 713     BlockDriver *drv = bs->drv;
 714     if (!drv)
 715         return -ENOMEDIUM;
 716     if (!drv->bdrv_getlength) {
 717         /* legacy mode */
 718         return bs->total_sectors * SECTOR_SIZE;
 719     }
 720     return drv->bdrv_getlength(bs);
 721 }
 722
 723 /* return 0 as number of sectors if no device present or error */
 724 void bdrv_get_geometry(BlockDriverState *bs, uint64_t *nb_sectors_ptr)
 725 {
 726     int64_t length;
 727     length = bdrv_getlength(bs);
 728     if (length < 0)
 729         length = 0;
 730     else
 731         length = length >> SECTOR_BITS;
 732     *nb_sectors_ptr = length;
 733 }
 734
 735 /* force a given boot sector. */
 736 void bdrv_set_boot_sector(BlockDriverState *bs, const uint8_t *data, int size)
 737 {
 738     bs->boot_sector_enabled = 1;
 739     if (size > 512)
 740         size = 512;
 741     memcpy(bs->boot_sector_data, data, size);
 742     memset(bs->boot_sector_data + size, 0, 512 - size);
 743 }
 744
 745 void bdrv_set_geometry_hint(BlockDriverState *bs,
 746                             int cyls, int heads, int secs)
 747 {
 748     bs->cyls = cyls;
 749     bs->heads = heads;
 750     bs->secs = secs;
 751 }
 752
 753 void bdrv_set_type_hint(BlockDriverState *bs, int type)
 754 {
 755     bs->type = type;
 756     bs->removable = ((type == BDRV_TYPE_CDROM ||
 757                       type == BDRV_TYPE_FLOPPY));
 758 }
 759
 760 void bdrv_set_translation_hint(BlockDriverState *bs, int translation)
 761 {
 762     bs->translation = translation;
 763 }
 764
 765 void bdrv_get_geometry_hint(BlockDriverState *bs,
 766                             int *pcyls, int *pheads, int *psecs)
 767 {
 768     *pcyls = bs->cyls;
 769     *pheads = bs->heads;
 770     *psecs = bs->secs;
 771 }
 772
 773 int bdrv_get_type_hint(BlockDriverState *bs)
 774 {
 775     return bs->type;
 776 }
 777
 778 int bdrv_get_translation_hint(BlockDriverState *bs)
 779 {
 780     return bs->translation;
 781 }
 782
 783 int bdrv_is_removable(BlockDriverState *bs)
 784 {
 785     return bs->removable;
 786 }
 787
 788 int bdrv_is_read_only(BlockDriverState *bs)
 789 {
 790     return bs->read_only;
 791 }
 792
 793 int bdrv_is_sg(BlockDriverState *bs)
 794 {
 795     return bs->sg;
 796 }
 797
 798 /* XXX: no longer used */
 799 void bdrv_set_change_cb(BlockDriverState *bs,
 800                         void (*change_cb)(void *opaque), void *opaque)
 801 {
 802     bs->change_cb = change_cb;
 803     bs->change_opaque = opaque;
 804 }
 805
 806 int bdrv_is_encrypted(BlockDriverState *bs)
 807 {
 808     if (bs->backing_hd && bs->backing_hd->encrypted)
 809         return 1;
 810     return bs->encrypted;
 811 }
 812
 813 int bdrv_set_key(BlockDriverState *bs, const char *key)
 814 {
 815     int ret;
 816     if (bs->backing_hd && bs->backing_hd->encrypted) {
 817         ret = bdrv_set_key(bs->backing_hd, key);
 818         if (ret < 0)
 819             return ret;
 820         if (!bs->encrypted)
 821             return 0;
 822     }
 823     if (!bs->encrypted || !bs->drv || !bs->drv->bdrv_set_key)
 824         return -1;
 825     return bs->drv->bdrv_set_key(bs, key);
 826 }
 827
 828 void bdrv_get_format(BlockDriverState *bs, char *buf, int buf_size)
 829 {
 830     if (!bs->drv) {
 831         buf[0] = '\0';
 832     } else {
 833         pstrcpy(buf, buf_size, bs->drv->format_name);
 834     }
 835 }
 836
 837 void bdrv_iterate_format(void (*it)(void *opaque, const char *name),
 838                          void *opaque)
 839 {
 840     BlockDriver *drv;
 841
 842     for (drv = first_drv; drv != NULL; drv = drv->next) {
 843         it(opaque, drv->format_name);
 844     }
 845 }
 846
 847 BlockDriverState *bdrv_find(const char *name)
 848 {
 849     BlockDriverState *bs;
 850
 851     for (bs = bdrv_first; bs != NULL; bs = bs->next) {
 852         if (!strcmp(name, bs->device_name))
 853             return bs;
 854     }
 855     return NULL;
 856 }
 857
 858 void bdrv_iterate(void (*it)(void *opaque, const char *name), void *opaque)
 859 {
 860     BlockDriverState *bs;
 861
 862     for (bs = bdrv_first; bs != NULL; bs = bs->next) {
 863         it(opaque, bs->device_name);
 864     }
 865 }
 866
 867 const char *bdrv_get_device_name(BlockDriverState *bs)
 868 {
 869     return bs->device_name;
 870 }
 871
 872 void bdrv_flush(BlockDriverState *bs)
 873 {
 874     if (bs->drv->bdrv_flush)
 875         bs->drv->bdrv_flush(bs);
 876     if (bs->backing_hd)
 877         bdrv_flush(bs->backing_hd);
 878 }
 879
 880 #ifndef QEMU_IMG
 881 void bdrv_info(void)
 882 {
 883     BlockDriverState *bs;
 884
 885     for (bs = bdrv_first; bs != NULL; bs = bs->next) {
 886         term_printf("%s:", bs->device_name);
 887         term_printf(" type=");
 888         switch(bs->type) {
 889         case BDRV_TYPE_HD:
 890             term_printf("hd");
 891             break;
 892         case BDRV_TYPE_CDROM:
 893             term_printf("cdrom");
 894             break;
 895         case BDRV_TYPE_FLOPPY:
 896             term_printf("floppy");
 897             break;
 898         }
 899         term_printf(" removable=%d", bs->removable);
 900         if (bs->removable) {
 901             term_printf(" locked=%d", bs->locked);
 902         }
 903         if (bs->drv) {
 904             term_printf(" file=");
 905             term_print_filename(bs->filename);
 906             if (bs->backing_file[0] != '\0') {
 907                 term_printf(" backing_file=");
 908                 term_print_filename(bs->backing_file);
 909             }
 910             term_printf(" ro=%d", bs->read_only);
 911             term_printf(" drv=%s", bs->drv->format_name);
 912             if (bs->encrypted)
 913                 term_printf(" encrypted");
 914         } else {
 915             term_printf(" [not inserted]");
 916         }
 917         term_printf("\n");
 918     }
 919 }
 920
 921 /* The "info blockstats" command. */
 922 void bdrv_info_stats (void)
 923 {
 924     BlockDriverState *bs;
 925
 926     for (bs = bdrv_first; bs != NULL; bs = bs->next) {
 927         term_printf ("%s:"
 928                      " rd_bytes=%" PRIu64
 929                      " wr_bytes=%" PRIu64
 930                      " rd_operations=%" PRIu64
 931                      " wr_operations=%" PRIu64
 932                      "\n",
 933                      bs->device_name,
 934                      bs->rd_bytes, bs->wr_bytes,
 935                      bs->rd_ops, bs->wr_ops);
 936     }
 937 }
 938 #endif
 939
 940 void bdrv_get_backing_filename(BlockDriverState *bs,
 941                                char *filename, int filename_size)
 942 {
 943     if (!bs->backing_hd) {
 944         pstrcpy(filename, filename_size, "");
 945     } else {
 946         pstrcpy(filename, filename_size, bs->backing_file);
 947     }
 948 }
 949
 950 int bdrv_write_compressed(BlockDriverState *bs, int64_t sector_num,
 951                           const uint8_t *buf, int nb_sectors)
 952 {
 953     BlockDriver *drv = bs->drv;
 954     if (!drv)
 955         return -ENOMEDIUM;
 956     if (!drv->bdrv_write_compressed)
 957         return -ENOTSUP;
 958     return drv->bdrv_write_compressed(bs, sector_num, buf, nb_sectors);
 959 }
 960
 961 int bdrv_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
 962 {
 963     BlockDriver *drv = bs->drv;
 964     if (!drv)
 965         return -ENOMEDIUM;
 966     if (!drv->bdrv_get_info)
 967         return -ENOTSUP;
 968     memset(bdi, 0, sizeof(*bdi));
 969     return drv->bdrv_get_info(bs, bdi);
 970 }
 971
 972 /**************************************************************/
 973 /* handling of snapshots */
 974
 975 int bdrv_snapshot_create(BlockDriverState *bs,
 976                          QEMUSnapshotInfo *sn_info)
 977 {
 978     BlockDriver *drv = bs->drv;
 979     if (!drv)
 980         return -ENOMEDIUM;
 981     if (!drv->bdrv_snapshot_create)
 982         return -ENOTSUP;
 983     return drv->bdrv_snapshot_create(bs, sn_info);
 984 }
 985
 986 int bdrv_snapshot_goto(BlockDriverState *bs,
 987                        const char *snapshot_id)
 988 {
 989     BlockDriver *drv = bs->drv;
 990     if (!drv)
 991         return -ENOMEDIUM;
 992     if (!drv->bdrv_snapshot_goto)
 993         return -ENOTSUP;
 994     return drv->bdrv_snapshot_goto(bs, snapshot_id);
 995 }
 996
 997 int bdrv_snapshot_delete(BlockDriverState *bs, const char *snapshot_id)
 998 {
 999     BlockDriver *drv = bs->drv;
1000     if (!drv)
1001         return -ENOMEDIUM;
1002     if (!drv->bdrv_snapshot_delete)
1003         return -ENOTSUP;
1004     return drv->bdrv_snapshot_delete(bs, snapshot_id);
1005 }
1006
1007 int bdrv_snapshot_list(BlockDriverState *bs,
1008                        QEMUSnapshotInfo **psn_info)
1009 {
1010     BlockDriver *drv = bs->drv;
1011     if (!drv)
1012         return -ENOMEDIUM;
1013     if (!drv->bdrv_snapshot_list)
1014         return -ENOTSUP;
1015     return drv->bdrv_snapshot_list(bs, psn_info);
1016 }
1017
1018 #define NB_SUFFIXES 4
1019
1020 char *get_human_readable_size(char *buf, int buf_size, int64_t size)
1021 {
1022     static const char suffixes[NB_SUFFIXES] = "KMGT";
1023     int64_t base;
1024     int i;
1025
1026     if (size <= 999) {
1027         snprintf(buf, buf_size, "%" PRId64, size);
1028     } else {
1029         base = 1024;
1030         for(i = 0; i < NB_SUFFIXES; i++) {
1031             if (size < (10 * base)) {
1032                 snprintf(buf, buf_size, "%0.1f%c",
1033                          (double)size / base,
1034                          suffixes[i]);
1035                 break;
1036             } else if (size < (1000 * base) || i == (NB_SUFFIXES - 1)) {
1037                 snprintf(buf, buf_size, "%" PRId64 "%c",
1038                          ((size + (base >> 1)) / base),
1039                          suffixes[i]);
1040                 break;
1041             }
1042             base = base * 1024;
1043         }
1044     }
1045     return buf;
1046 }
1047
1048 char *bdrv_snapshot_dump(char *buf, int buf_size, QEMUSnapshotInfo *sn)
1049 {
1050     char buf1[128], date_buf[128], clock_buf[128];
1051 #ifdef _WIN32
1052     struct tm *ptm;
1053 #else
1054     struct tm tm;
1055 #endif
1056     time_t ti;
1057     int64_t secs;
1058
1059     if (!sn) {
1060         snprintf(buf, buf_size,
1061                  "%-10s%-20s%7s%20s%15s",
1062                  "ID", "TAG", "VM SIZE", "DATE", "VM CLOCK");
1063     } else {
1064         ti = sn->date_sec;
1065 #ifdef _WIN32
1066         ptm = localtime(&ti);
1067         strftime(date_buf, sizeof(date_buf),
1068                  "%Y-%m-%d %H:%M:%S", ptm);
1069 #else
1070         localtime_r(&ti, &tm);
1071         strftime(date_buf, sizeof(date_buf),
1072                  "%Y-%m-%d %H:%M:%S", &tm);
1073 #endif
1074         secs = sn->vm_clock_nsec / 1000000000;
1075         snprintf(clock_buf, sizeof(clock_buf),
1076                  "%02d:%02d:%02d.%03d",
1077                  (int)(secs / 3600),
1078                  (int)((secs / 60) % 60),
1079                  (int)(secs % 60),
1080                  (int)((sn->vm_clock_nsec / 1000000) % 1000));
1081         snprintf(buf, buf_size,
1082                  "%-10s%-20s%7s%20s%15s",
1083                  sn->id_str, sn->name,
1084                  get_human_readable_size(buf1, sizeof(buf1), sn->vm_state_size),
1085                  date_buf,
1086                  clock_buf);
1087     }
1088     return buf;
1089 }
1090
1091
1092 /**************************************************************/
1093 /* async I/Os */
1094
1095 BlockDriverAIOCB *bdrv_aio_read(BlockDriverState *bs, int64_t sector_num,
1096                                 uint8_t *buf, int nb_sectors,
1097                                 BlockDriverCompletionFunc *cb, void *opaque)
1098 {
1099     BlockDriver *drv = bs->drv;
1100     BlockDriverAIOCB *ret;
1101
1102     if (!drv)
1103         return NULL;
1104
1105     /* XXX: we assume that nb_sectors == 0 is suppored by the async read */
1106     if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1107         memcpy(buf, bs->boot_sector_data, 512);
1108         sector_num++;
1109         nb_sectors--;
1110         buf += 512;
1111     }
1112
1113     ret = drv->bdrv_aio_read(bs, sector_num, buf, nb_sectors, cb, opaque);
1114
1115     if (ret) {
1116         /* Update stats even though technically transfer has not happened. */
1117         bs->rd_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1118         bs->rd_ops ++;
1119     }
1120
1121     return ret;
1122 }
1123
1124 BlockDriverAIOCB *bdrv_aio_write(BlockDriverState *bs, int64_t sector_num,
1125                                  const uint8_t *buf, int nb_sectors,
1126                                  BlockDriverCompletionFunc *cb, void *opaque)
1127 {
1128     BlockDriver *drv = bs->drv;
1129     BlockDriverAIOCB *ret;
1130
1131     if (!drv)
1132         return NULL;
1133     if (bs->read_only)
1134         return NULL;
1135     if (sector_num == 0 && bs->boot_sector_enabled && nb_sectors > 0) {
1136         memcpy(bs->boot_sector_data, buf, 512);
1137     }
1138
1139     ret = drv->bdrv_aio_write(bs, sector_num, buf, nb_sectors, cb, opaque);
1140
1141     if (ret) {
1142         /* Update stats even though technically transfer has not happened. */
1143         bs->wr_bytes += (unsigned) nb_sectors * SECTOR_SIZE;
1144         bs->wr_ops ++;
1145     }
1146
1147     return ret;
1148 }
1149
1150 void bdrv_aio_cancel(BlockDriverAIOCB *acb)
1151 {
1152     BlockDriver *drv = acb->bs->drv;
1153
1154     drv->bdrv_aio_cancel(acb);
1155 }
1156
1157
1158 /**************************************************************/
1159 /* async block device emulation */
1160
1161 #ifdef QEMU_IMG
1162 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1163         int64_t sector_num, uint8_t *buf, int nb_sectors,
1164         BlockDriverCompletionFunc *cb, void *opaque)
1165 {
1166     int ret;
1167     ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1168     cb(opaque, ret);
1169     return NULL;
1170 }
1171
1172 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1173         int64_t sector_num, const uint8_t *buf, int nb_sectors,
1174         BlockDriverCompletionFunc *cb, void *opaque)
1175 {
1176     int ret;
1177     ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1178     cb(opaque, ret);
1179     return NULL;
1180 }
1181
1182 static void bdrv_aio_cancel_em(BlockDriverAIOCB *acb)
1183 {
1184 }
1185 #else
1186 static void bdrv_aio_bh_cb(void *opaque)
1187 {
1188     BlockDriverAIOCBSync *acb = opaque;
1189     acb->common.cb(acb->common.opaque, acb->ret);
1190     qemu_aio_release(acb);
1191 }
1192
1193 static BlockDriverAIOCB *bdrv_aio_read_em(BlockDriverState *bs,
1194         int64_t sector_num, uint8_t *buf, int nb_sectors,
1195         BlockDriverCompletionFunc *cb, void *opaque)
1196 {
1197     BlockDriverAIOCBSync *acb;
1198     int ret;
1199
1200     acb = qemu_aio_get(bs, cb, opaque);
1201     if (!acb->bh)
1202         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1203     ret = bdrv_read(bs, sector_num, buf, nb_sectors);
1204     acb->ret = ret;
1205     qemu_bh_schedule(acb->bh);
1206     return &acb->common;
1207 }
1208
1209 static BlockDriverAIOCB *bdrv_aio_write_em(BlockDriverState *bs,
1210         int64_t sector_num, const uint8_t *buf, int nb_sectors,
1211         BlockDriverCompletionFunc *cb, void *opaque)
1212 {
1213     BlockDriverAIOCBSync *acb;
1214     int ret;
1215
1216     acb = qemu_aio_get(bs, cb, opaque);
1217     if (!acb->bh)
1218         acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb);
1219     ret = bdrv_write(bs, sector_num, buf, nb_sectors);
1220     acb->ret = ret;
1221     qemu_bh_schedule(acb->bh);
1222     return &acb->common;
1223 }
1224
1225 static void bdrv_aio_cancel_em(BlockDriverAIOCB *blockacb)
1226 {
1227     BlockDriverAIOCBSync *acb = (BlockDriverAIOCBSync *)blockacb;
1228     qemu_bh_cancel(acb->bh);
1229     qemu_aio_release(acb);
1230 }
1231 #endif /* !QEMU_IMG */
1232
1233 /**************************************************************/
1234 /* sync block device emulation */
1235
1236 static void bdrv_rw_em_cb(void *opaque, int ret)
1237 {
1238     *(int *)opaque = ret;
1239 }
1240
1241 #define NOT_DONE 0x7fffffff
1242
1243 static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num,
1244                         uint8_t *buf, int nb_sectors)
1245 {
1246     int async_ret;
1247     BlockDriverAIOCB *acb;
1248
1249     async_ret = NOT_DONE;
1250     qemu_aio_wait_start();
1251     acb = bdrv_aio_read(bs, sector_num, buf, nb_sectors,
1252                         bdrv_rw_em_cb, &async_ret);
1253     if (acb == NULL) {
1254         qemu_aio_wait_end();
1255         return -1;
1256     }
1257     while (async_ret == NOT_DONE) {
1258         qemu_aio_wait();
1259     }
1260     qemu_aio_wait_end();
1261     return async_ret;
1262 }
1263
1264 static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num,
1265                          const uint8_t *buf, int nb_sectors)
1266 {
1267     int async_ret;
1268     BlockDriverAIOCB *acb;
1269
1270     async_ret = NOT_DONE;
1271     qemu_aio_wait_start();
1272     acb = bdrv_aio_write(bs, sector_num, buf, nb_sectors,
1273                          bdrv_rw_em_cb, &async_ret);
1274     if (acb == NULL) {
1275         qemu_aio_wait_end();
1276         return -1;
1277     }
1278     while (async_ret == NOT_DONE) {
1279         qemu_aio_wait();
1280     }
1281     qemu_aio_wait_end();
1282     return async_ret;
1283 }
1284
1285 void bdrv_init(void)
1286 {
1287     bdrv_register(&bdrv_raw);
1288     bdrv_register(&bdrv_host_device);
1289 #ifndef _WIN32
1290     bdrv_register(&bdrv_cow);
1291 #endif
1292     bdrv_register(&bdrv_qcow);
1293     bdrv_register(&bdrv_vmdk);
1294     bdrv_register(&bdrv_cloop);
1295     bdrv_register(&bdrv_dmg);
1296     bdrv_register(&bdrv_bochs);
1297     bdrv_register(&bdrv_vpc);
1298     bdrv_register(&bdrv_vvfat);
1299     bdrv_register(&bdrv_qcow2);
1300     bdrv_register(&bdrv_parallels);
1301 }
1302
1303 void *qemu_aio_get(BlockDriverState *bs, BlockDriverCompletionFunc *cb,
1304                    void *opaque)
1305 {
1306     BlockDriver *drv;
1307     BlockDriverAIOCB *acb;
1308
1309     drv = bs->drv;
1310     if (drv->free_aiocb) {
1311         acb = drv->free_aiocb;
1312         drv->free_aiocb = acb->next;
1313     } else {
1314         acb = qemu_mallocz(drv->aiocb_size);
1315         if (!acb)
1316             return NULL;
1317     }
1318     acb->bs = bs;
1319     acb->cb = cb;
1320     acb->opaque = opaque;
1321     return acb;
1322 }
1323
1324 void qemu_aio_release(void *p)
1325 {
1326     BlockDriverAIOCB *acb = p;
1327     BlockDriver *drv = acb->bs->drv;
1328     acb->next = drv->free_aiocb;
1329     drv->free_aiocb = acb;
1330 }
1331
1332 /**************************************************************/
1333 /* removable device support */
1334
1335 /**
1336  * Return TRUE if the media is present
1337  */
1338 int bdrv_is_inserted(BlockDriverState *bs)
1339 {
1340     BlockDriver *drv = bs->drv;
1341     int ret;
1342     if (!drv)
1343         return 0;
1344     if (!drv->bdrv_is_inserted)
1345         return 1;
1346     ret = drv->bdrv_is_inserted(bs);
1347     return ret;
1348 }
1349
1350 /**
1351  * Return TRUE if the media changed since the last call to this
1352  * function. It is currently only used for floppy disks
1353  */
1354 int bdrv_media_changed(BlockDriverState *bs)
1355 {
1356     BlockDriver *drv = bs->drv;
1357     int ret;
1358
1359     if (!drv || !drv->bdrv_media_changed)
1360         ret = -ENOTSUP;
1361     else
1362         ret = drv->bdrv_media_changed(bs);
1363     if (ret == -ENOTSUP)
1364         ret = bs->media_changed;
1365     bs->media_changed = 0;
1366     return ret;
1367 }
1368
1369 /**
1370  * If eject_flag is TRUE, eject the media. Otherwise, close the tray
1371  */
1372 void bdrv_eject(BlockDriverState *bs, int eject_flag)
1373 {
1374     BlockDriver *drv = bs->drv;
1375     int ret;
1376
1377     if (!drv || !drv->bdrv_eject) {
1378         ret = -ENOTSUP;
1379     } else {
1380         ret = drv->bdrv_eject(bs, eject_flag);
1381     }
1382     if (ret == -ENOTSUP) {
1383         if (eject_flag)
1384             bdrv_close(bs);
1385     }
1386 }
1387
1388 int bdrv_is_locked(BlockDriverState *bs)
1389 {
1390     return bs->locked;
1391 }
1392
1393 /**
1394  * Lock or unlock the media (if it is locked, the user won't be able
1395  * to eject it manually).
1396  */
1397 void bdrv_set_locked(BlockDriverState *bs, int locked)
1398 {
1399     BlockDriver *drv = bs->drv;
1400
1401     bs->locked = locked;
1402     if (drv && drv->bdrv_set_locked) {
1403         drv->bdrv_set_locked(bs, locked);
1404     }
1405 }
1406
1407 /* needed for generic scsi interface */
1408
1409 int bdrv_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
1410 {
1411     BlockDriver *drv = bs->drv;
1412
1413     if (drv && drv->bdrv_ioctl)
1414         return drv->bdrv_ioctl(bs, req, buf);
1415     return -ENOTSUP;
1416 }