block/raw-posix.c

   1 /*
   2  * Block driver for RAW files (posix)
   3  *
   4  * Copyright (c) 2006 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 "qemu-timer.h"
  26 #include "qemu-char.h"
  27 #include "qemu-log.h"
  28 #include "block_int.h"
  29 #include "module.h"
  30 #include "block/raw-posix-aio.h"
  31
  32 #if defined(__APPLE__) && (__MACH__)
  33 #include <paths.h>
  34 #include <sys/param.h>
  35 #include <IOKit/IOKitLib.h>
  36 #include <IOKit/IOBSD.h>
  37 #include <IOKit/storage/IOMediaBSDClient.h>
  38 #include <IOKit/storage/IOMedia.h>
  39 #include <IOKit/storage/IOCDMedia.h>
  40 //#include <IOKit/storage/IOCDTypes.h>
  41 #include <CoreFoundation/CoreFoundation.h>
  42 #endif
  43
  44 #ifdef __sun__
  45 #define _POSIX_PTHREAD_SEMANTICS 1
  46 #include <sys/dkio.h>
  47 #endif
  48 #ifdef __linux__
  49 #include <sys/types.h>
  50 #include <sys/stat.h>
  51 #include <sys/ioctl.h>
  52 #include <sys/param.h>
  53 #include <linux/cdrom.h>
  54 #include <linux/fd.h>
  55 #include <linux/fs.h>
  56 #endif
  57 #ifdef CONFIG_FIEMAP
  58 #include <linux/fiemap.h>
  59 #endif
  60 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
  61 #include <sys/disk.h>
  62 #include <sys/cdio.h>
  63 #endif
  64
  65 #ifdef __OpenBSD__
  66 #include <sys/ioctl.h>
  67 #include <sys/disklabel.h>
  68 #include <sys/dkio.h>
  69 #endif
  70
  71 #ifdef __NetBSD__
  72 #include <sys/ioctl.h>
  73 #include <sys/disklabel.h>
  74 #include <sys/dkio.h>
  75 #include <sys/disk.h>
  76 #endif
  77
  78 #ifdef __DragonFly__
  79 #include <sys/ioctl.h>
  80 #include <sys/diskslice.h>
  81 #endif
  82
  83 #ifdef CONFIG_XFS
  84 #include <xfs/xfs.h>
  85 #endif
  86
  87 //#define DEBUG_FLOPPY
  88
  89 //#define DEBUG_BLOCK
  90 #if defined(DEBUG_BLOCK)
  91 #define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \
  92     { qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0)
  93 #else
  94 #define DEBUG_BLOCK_PRINT(formatCstr, ...)
  95 #endif
  96
  97 /* OS X does not have O_DSYNC */
  98 #ifndef O_DSYNC
  99 #ifdef O_SYNC
 100 #define O_DSYNC O_SYNC
 101 #elif defined(O_FSYNC)
 102 #define O_DSYNC O_FSYNC
 103 #endif
 104 #endif
 105
 106 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
 107 #ifndef O_DIRECT
 108 #define O_DIRECT O_DSYNC
 109 #endif
 110
 111 #define FTYPE_FILE   0
 112 #define FTYPE_CD     1
 113 #define FTYPE_FD     2
 114
 115 /* if the FD is not accessed during that time (in ns), we try to
 116    reopen it to see if the disk has been changed */
 117 #define FD_OPEN_TIMEOUT (1000000000)
 118
 119 #define MAX_BLOCKSIZE   4096
 120
 121 typedef struct BDRVRawState {
 122     int fd;
 123     int type;
 124     int open_flags;
 125 #if defined(__linux__)
 126     /* linux floppy specific */
 127     int64_t fd_open_time;
 128     int64_t fd_error_time;
 129     int fd_got_error;
 130     int fd_media_changed;
 131 #endif
 132 #ifdef CONFIG_LINUX_AIO
 133     int use_aio;
 134     void *aio_ctx;
 135 #endif
 136     uint8_t *aligned_buf;
 137     unsigned aligned_buf_size;
 138 #ifdef CONFIG_XFS
 139     bool is_xfs : 1;
 140 #endif
 141 } BDRVRawState;
 142
 143 static int fd_open(BlockDriverState *bs);
 144 static int64_t raw_getlength(BlockDriverState *bs);
 145
 146 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 147 static int cdrom_reopen(BlockDriverState *bs);
 148 #endif
 149
 150 #if defined(__NetBSD__)
 151 static int raw_normalize_devicepath(const char **filename)
 152 {
 153     static char namebuf[PATH_MAX];
 154     const char *dp, *fname;
 155     struct stat sb;
 156
 157     fname = *filename;
 158     dp = strrchr(fname, '/');
 159     if (lstat(fname, &sb) < 0) {
 160         fprintf(stderr, "%s: stat failed: %s\n",
 161             fname, strerror(errno));
 162         return -errno;
 163     }
 164
 165     if (!S_ISBLK(sb.st_mode)) {
 166         return 0;
 167     }
 168
 169     if (dp == NULL) {
 170         snprintf(namebuf, PATH_MAX, "r%s", fname);
 171     } else {
 172         snprintf(namebuf, PATH_MAX, "%.*s/r%s",
 173             (int)(dp - fname), fname, dp + 1);
 174     }
 175     fprintf(stderr, "%s is a block device", fname);
 176     *filename = namebuf;
 177     fprintf(stderr, ", using %s\n", *filename);
 178
 179     return 0;
 180 }
 181 #else
 182 static int raw_normalize_devicepath(const char **filename)
 183 {
 184     return 0;
 185 }
 186 #endif
 187
 188 static int raw_open_common(BlockDriverState *bs, const char *filename,
 189                            int bdrv_flags, int open_flags)
 190 {
 191     BDRVRawState *s = bs->opaque;
 192     int fd, ret;
 193
 194     ret = raw_normalize_devicepath(&filename);
 195     if (ret != 0) {
 196         return ret;
 197     }
 198
 199     s->open_flags = open_flags | O_BINARY;
 200     s->open_flags &= ~O_ACCMODE;
 201     if (bdrv_flags & BDRV_O_RDWR) {
 202         s->open_flags |= O_RDWR;
 203     } else {
 204         s->open_flags |= O_RDONLY;
 205     }
 206
 207     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
 208      * and O_DIRECT for no caching. */
 209     if ((bdrv_flags & BDRV_O_NOCACHE))
 210         s->open_flags |= O_DIRECT;
 211     if (!(bdrv_flags & BDRV_O_CACHE_WB))
 212         s->open_flags |= O_DSYNC;
 213
 214     s->fd = -1;
 215     fd = qemu_open(filename, s->open_flags, 0644);
 216     if (fd < 0) {
 217         ret = -errno;
 218         if (ret == -EROFS)
 219             ret = -EACCES;
 220         return ret;
 221     }
 222     s->fd = fd;
 223     s->aligned_buf = NULL;
 224
 225     if ((bdrv_flags & BDRV_O_NOCACHE)) {
 226         /*
 227          * Allocate a buffer for read/modify/write cycles.  Chose the size
 228          * pessimistically as we don't know the block size yet.
 229          */
 230         s->aligned_buf_size = 32 * MAX_BLOCKSIZE;
 231         s->aligned_buf = qemu_memalign(MAX_BLOCKSIZE, s->aligned_buf_size);
 232         if (s->aligned_buf == NULL) {
 233             goto out_close;
 234         }
 235     }
 236
 237     /* We're falling back to POSIX AIO in some cases so init always */
 238     if (paio_init() < 0) {
 239         goto out_free_buf;
 240     }
 241
 242 #ifdef CONFIG_LINUX_AIO
 243     /*
 244      * Currently Linux do AIO only for files opened with O_DIRECT
 245      * specified so check NOCACHE flag too
 246      */
 247     if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
 248                       (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
 249
 250         s->aio_ctx = laio_init();
 251         if (!s->aio_ctx) {
 252             goto out_free_buf;
 253         }
 254         s->use_aio = 1;
 255     } else
 256 #endif
 257     {
 258 #ifdef CONFIG_LINUX_AIO
 259         s->use_aio = 0;
 260 #endif
 261     }
 262
 263 #ifdef CONFIG_XFS
 264     if (platform_test_xfs_fd(s->fd)) {
 265         s->is_xfs = 1;
 266     }
 267 #endif
 268
 269     return 0;
 270
 271 out_free_buf:
 272     qemu_vfree(s->aligned_buf);
 273 out_close:
 274     qemu_close(fd);
 275     return -errno;
 276 }
 277
 278 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 279 {
 280     BDRVRawState *s = bs->opaque;
 281
 282     s->type = FTYPE_FILE;
 283     return raw_open_common(bs, filename, flags, 0);
 284 }
 285
 286 /* XXX: use host sector size if necessary with:
 287 #ifdef DIOCGSECTORSIZE
 288         {
 289             unsigned int sectorsize = 512;
 290             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 291                 sectorsize > bufsize)
 292                 bufsize = sectorsize;
 293         }
 294 #endif
 295 #ifdef CONFIG_COCOA
 296         uint32_t blockSize = 512;
 297         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 298             bufsize = blockSize;
 299         }
 300 #endif
 301 */
 302
 303 /*
 304  * Check if all memory in this vector is sector aligned.
 305  */
 306 static int qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
 307 {
 308     int i;
 309
 310     for (i = 0; i < qiov->niov; i++) {
 311         if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) {
 312             return 0;
 313         }
 314     }
 315
 316     return 1;
 317 }
 318
 319 static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
 320         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 321         BlockDriverCompletionFunc *cb, void *opaque, int type)
 322 {
 323     BDRVRawState *s = bs->opaque;
 324
 325     if (fd_open(bs) < 0)
 326         return NULL;
 327
 328     /*
 329      * If O_DIRECT is used the buffer needs to be aligned on a sector
 330      * boundary.  Check if this is the case or tell the low-level
 331      * driver that it needs to copy the buffer.
 332      */
 333     if (s->aligned_buf) {
 334         if (!qiov_is_aligned(bs, qiov)) {
 335             type |= QEMU_AIO_MISALIGNED;
 336 #ifdef CONFIG_LINUX_AIO
 337         } else if (s->use_aio) {
 338             return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
 339                                nb_sectors, cb, opaque, type);
 340 #endif
 341         }
 342     }
 343
 344     return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
 345                        cb, opaque, type);
 346 }
 347
 348 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
 349         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 350         BlockDriverCompletionFunc *cb, void *opaque)
 351 {
 352     return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
 353                           cb, opaque, QEMU_AIO_READ);
 354 }
 355
 356 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
 357         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 358         BlockDriverCompletionFunc *cb, void *opaque)
 359 {
 360     return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
 361                           cb, opaque, QEMU_AIO_WRITE);
 362 }
 363
 364 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
 365         BlockDriverCompletionFunc *cb, void *opaque)
 366 {
 367     BDRVRawState *s = bs->opaque;
 368
 369     if (fd_open(bs) < 0)
 370         return NULL;
 371
 372     return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 373 }
 374
 375 static void raw_close(BlockDriverState *bs)
 376 {
 377     BDRVRawState *s = bs->opaque;
 378     if (s->fd >= 0) {
 379         qemu_close(s->fd);
 380         s->fd = -1;
 381         if (s->aligned_buf != NULL)
 382             qemu_vfree(s->aligned_buf);
 383     }
 384 }
 385
 386 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 387 {
 388     BDRVRawState *s = bs->opaque;
 389     struct stat st;
 390
 391     if (fstat(s->fd, &st)) {
 392         return -errno;
 393     }
 394
 395     if (S_ISREG(st.st_mode)) {
 396         if (ftruncate(s->fd, offset) < 0) {
 397             return -errno;
 398         }
 399     } else if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 400        if (offset > raw_getlength(bs)) {
 401            return -EINVAL;
 402        }
 403     } else {
 404         return -ENOTSUP;
 405     }
 406
 407     return 0;
 408 }
 409
 410 #ifdef __OpenBSD__
 411 static int64_t raw_getlength(BlockDriverState *bs)
 412 {
 413     BDRVRawState *s = bs->opaque;
 414     int fd = s->fd;
 415     struct stat st;
 416
 417     if (fstat(fd, &st))
 418         return -1;
 419     if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 420         struct disklabel dl;
 421
 422         if (ioctl(fd, DIOCGDINFO, &dl))
 423             return -1;
 424         return (uint64_t)dl.d_secsize *
 425             dl.d_partitions[DISKPART(st.st_rdev)].p_size;
 426     } else
 427         return st.st_size;
 428 }
 429 #elif defined(__NetBSD__)
 430 static int64_t raw_getlength(BlockDriverState *bs)
 431 {
 432     BDRVRawState *s = bs->opaque;
 433     int fd = s->fd;
 434     struct stat st;
 435
 436     if (fstat(fd, &st))
 437         return -1;
 438     if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 439         struct dkwedge_info dkw;
 440
 441         if (ioctl(fd, DIOCGWEDGEINFO, &dkw) != -1) {
 442             return dkw.dkw_size * 512;
 443         } else {
 444             struct disklabel dl;
 445
 446             if (ioctl(fd, DIOCGDINFO, &dl))
 447                 return -1;
 448             return (uint64_t)dl.d_secsize *
 449                 dl.d_partitions[DISKPART(st.st_rdev)].p_size;
 450         }
 451     } else
 452         return st.st_size;
 453 }
 454 #elif defined(__sun__)
 455 static int64_t raw_getlength(BlockDriverState *bs)
 456 {
 457     BDRVRawState *s = bs->opaque;
 458     struct dk_minfo minfo;
 459     int ret;
 460
 461     ret = fd_open(bs);
 462     if (ret < 0) {
 463         return ret;
 464     }
 465
 466     /*
 467      * Use the DKIOCGMEDIAINFO ioctl to read the size.
 468      */
 469     ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
 470     if (ret != -1) {
 471         return minfo.dki_lbsize * minfo.dki_capacity;
 472     }
 473
 474     /*
 475      * There are reports that lseek on some devices fails, but
 476      * irc discussion said that contingency on contingency was overkill.
 477      */
 478     return lseek(s->fd, 0, SEEK_END);
 479 }
 480 #elif defined(CONFIG_BSD)
 481 static int64_t raw_getlength(BlockDriverState *bs)
 482 {
 483     BDRVRawState *s = bs->opaque;
 484     int fd = s->fd;
 485     int64_t size;
 486     struct stat sb;
 487 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 488     int reopened = 0;
 489 #endif
 490     int ret;
 491
 492     ret = fd_open(bs);
 493     if (ret < 0)
 494         return ret;
 495
 496 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 497 again:
 498 #endif
 499     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 500 #ifdef DIOCGMEDIASIZE
 501         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 502 #elif defined(DIOCGPART)
 503         {
 504                 struct partinfo pi;
 505                 if (ioctl(fd, DIOCGPART, &pi) == 0)
 506                         size = pi.media_size;
 507                 else
 508                         size = 0;
 509         }
 510         if (size == 0)
 511 #endif
 512 #if defined(__APPLE__) && defined(__MACH__)
 513         size = LONG_LONG_MAX;
 514 #else
 515         size = lseek(fd, 0LL, SEEK_END);
 516 #endif
 517 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 518         switch(s->type) {
 519         case FTYPE_CD:
 520             /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
 521             if (size == 2048LL * (unsigned)-1)
 522                 size = 0;
 523             /* XXX no disc?  maybe we need to reopen... */
 524             if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
 525                 reopened = 1;
 526                 goto again;
 527             }
 528         }
 529 #endif
 530     } else {
 531         size = lseek(fd, 0, SEEK_END);
 532     }
 533     return size;
 534 }
 535 #else
 536 static int64_t raw_getlength(BlockDriverState *bs)
 537 {
 538     BDRVRawState *s = bs->opaque;
 539     int ret;
 540
 541     ret = fd_open(bs);
 542     if (ret < 0) {
 543         return ret;
 544     }
 545
 546     return lseek(s->fd, 0, SEEK_END);
 547 }
 548 #endif
 549
 550 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
 551 {
 552     struct stat st;
 553     BDRVRawState *s = bs->opaque;
 554
 555     if (fstat(s->fd, &st) < 0) {
 556         return -errno;
 557     }
 558     return (int64_t)st.st_blocks * 512;
 559 }
 560
 561 static int raw_create(const char *filename, QEMUOptionParameter *options)
 562 {
 563     int fd;
 564     int result = 0;
 565     int64_t total_size = 0;
 566
 567     /* Read out options */
 568     while (options && options->name) {
 569         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 570             total_size = options->value.n / BDRV_SECTOR_SIZE;
 571         }
 572         options++;
 573     }
 574
 575     fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 576                    0644);
 577     if (fd < 0) {
 578         result = -errno;
 579     } else {
 580         if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
 581             result = -errno;
 582         }
 583         if (qemu_close(fd) != 0) {
 584             result = -errno;
 585         }
 586     }
 587     return result;
 588 }
 589
 590 /*
 591  * Returns true iff the specified sector is present in the disk image. Drivers
 592  * not implementing the functionality are assumed to not support backing files,
 593  * hence all their sectors are reported as allocated.
 594  *
 595  * If 'sector_num' is beyond the end of the disk image the return value is 0
 596  * and 'pnum' is set to 0.
 597  *
 598  * 'pnum' is set to the number of sectors (including and immediately following
 599  * the specified sector) that are known to be in the same
 600  * allocated/unallocated state.
 601  *
 602  * 'nb_sectors' is the max value 'pnum' should be set to.  If nb_sectors goes
 603  * beyond the end of the disk image it will be clamped.
 604  */
 605 static int coroutine_fn raw_co_is_allocated(BlockDriverState *bs,
 606                                             int64_t sector_num,
 607                                             int nb_sectors, int *pnum)
 608 {
 609     off_t start, data, hole;
 610     int ret;
 611
 612     ret = fd_open(bs);
 613     if (ret < 0) {
 614         return ret;
 615     }
 616
 617     start = sector_num * BDRV_SECTOR_SIZE;
 618
 619 #ifdef CONFIG_FIEMAP
 620
 621     BDRVRawState *s = bs->opaque;
 622     struct {
 623         struct fiemap fm;
 624         struct fiemap_extent fe;
 625     } f;
 626
 627     f.fm.fm_start = start;
 628     f.fm.fm_length = (int64_t)nb_sectors * BDRV_SECTOR_SIZE;
 629     f.fm.fm_flags = 0;
 630     f.fm.fm_extent_count = 1;
 631     f.fm.fm_reserved = 0;
 632     if (ioctl(s->fd, FS_IOC_FIEMAP, &f) == -1) {
 633         /* Assume everything is allocated.  */
 634         *pnum = nb_sectors;
 635         return 1;
 636     }
 637
 638     if (f.fm.fm_mapped_extents == 0) {
 639         /* No extents found, data is beyond f.fm.fm_start + f.fm.fm_length.
 640          * f.fm.fm_start + f.fm.fm_length must be clamped to the file size!
 641          */
 642         off_t length = lseek(s->fd, 0, SEEK_END);
 643         hole = f.fm.fm_start;
 644         data = MIN(f.fm.fm_start + f.fm.fm_length, length);
 645     } else {
 646         data = f.fe.fe_logical;
 647         hole = f.fe.fe_logical + f.fe.fe_length;
 648     }
 649
 650 #elif defined SEEK_HOLE && defined SEEK_DATA
 651
 652     BDRVRawState *s = bs->opaque;
 653
 654     hole = lseek(s->fd, start, SEEK_HOLE);
 655     if (hole == -1) {
 656         /* -ENXIO indicates that sector_num was past the end of the file.
 657          * There is a virtual hole there.  */
 658         assert(errno != -ENXIO);
 659
 660         /* Most likely EINVAL.  Assume everything is allocated.  */
 661         *pnum = nb_sectors;
 662         return 1;
 663     }
 664
 665     if (hole > start) {
 666         data = start;
 667     } else {
 668         /* On a hole.  We need another syscall to find its end.  */
 669         data = lseek(s->fd, start, SEEK_DATA);
 670         if (data == -1) {
 671             data = lseek(s->fd, 0, SEEK_END);
 672         }
 673     }
 674 #else
 675     *pnum = nb_sectors;
 676     return 1;
 677 #endif
 678
 679     if (data <= start) {
 680         /* On a data extent, compute sectors to the end of the extent.  */
 681         *pnum = MIN(nb_sectors, (hole - start) / BDRV_SECTOR_SIZE);
 682         return 1;
 683     } else {
 684         /* On a hole, compute sectors to the beginning of the next extent.  */
 685         *pnum = MIN(nb_sectors, (data - start) / BDRV_SECTOR_SIZE);
 686         return 0;
 687     }
 688 }
 689
 690 #ifdef CONFIG_XFS
 691 static int xfs_discard(BDRVRawState *s, int64_t sector_num, int nb_sectors)
 692 {
 693     struct xfs_flock64 fl;
 694
 695     memset(&fl, 0, sizeof(fl));
 696     fl.l_whence = SEEK_SET;
 697     fl.l_start = sector_num << 9;
 698     fl.l_len = (int64_t)nb_sectors << 9;
 699
 700     if (xfsctl(NULL, s->fd, XFS_IOC_UNRESVSP64, &fl) < 0) {
 701         DEBUG_BLOCK_PRINT("cannot punch hole (%s)\n", strerror(errno));
 702         return -errno;
 703     }
 704
 705     return 0;
 706 }
 707 #endif
 708
 709 static coroutine_fn int raw_co_discard(BlockDriverState *bs,
 710     int64_t sector_num, int nb_sectors)
 711 {
 712 #ifdef CONFIG_XFS
 713     BDRVRawState *s = bs->opaque;
 714
 715     if (s->is_xfs) {
 716         return xfs_discard(s, sector_num, nb_sectors);
 717     }
 718 #endif
 719
 720     return 0;
 721 }
 722
 723 static QEMUOptionParameter raw_create_options[] = {
 724     {
 725         .name = BLOCK_OPT_SIZE,
 726         .type = OPT_SIZE,
 727         .help = "Virtual disk size"
 728     },
 729     { NULL }
 730 };
 731
 732 static BlockDriver bdrv_file = {
 733     .format_name = "file",
 734     .protocol_name = "file",
 735     .instance_size = sizeof(BDRVRawState),
 736     .bdrv_probe = NULL, /* no probe for protocols */
 737     .bdrv_file_open = raw_open,
 738     .bdrv_close = raw_close,
 739     .bdrv_create = raw_create,
 740     .bdrv_co_discard = raw_co_discard,
 741     .bdrv_co_is_allocated = raw_co_is_allocated,
 742
 743     .bdrv_aio_readv = raw_aio_readv,
 744     .bdrv_aio_writev = raw_aio_writev,
 745     .bdrv_aio_flush = raw_aio_flush,
 746
 747     .bdrv_truncate = raw_truncate,
 748     .bdrv_getlength = raw_getlength,
 749     .bdrv_get_allocated_file_size
 750                         = raw_get_allocated_file_size,
 751
 752     .create_options = raw_create_options,
 753 };
 754
 755 /***********************************************/
 756 /* host device */
 757
 758 #if defined(__APPLE__) && defined(__MACH__)
 759 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 760 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 761
 762 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 763 {
 764     kern_return_t       kernResult;
 765     mach_port_t     masterPort;
 766     CFMutableDictionaryRef  classesToMatch;
 767
 768     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 769     if ( KERN_SUCCESS != kernResult ) {
 770         printf( "IOMasterPort returned %d\n", kernResult );
 771     }
 772
 773     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 774     if ( classesToMatch == NULL ) {
 775         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 776     } else {
 777     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 778     }
 779     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 780     if ( KERN_SUCCESS != kernResult )
 781     {
 782         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 783     }
 784
 785     return kernResult;
 786 }
 787
 788 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 789 {
 790     io_object_t     nextMedia;
 791     kern_return_t   kernResult = KERN_FAILURE;
 792     *bsdPath = '\0';
 793     nextMedia = IOIteratorNext( mediaIterator );
 794     if ( nextMedia )
 795     {
 796         CFTypeRef   bsdPathAsCFString;
 797     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 798         if ( bsdPathAsCFString ) {
 799             size_t devPathLength;
 800             strcpy( bsdPath, _PATH_DEV );
 801             strcat( bsdPath, "r" );
 802             devPathLength = strlen( bsdPath );
 803             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 804                 kernResult = KERN_SUCCESS;
 805             }
 806             CFRelease( bsdPathAsCFString );
 807         }
 808         IOObjectRelease( nextMedia );
 809     }
 810
 811     return kernResult;
 812 }
 813
 814 #endif
 815
 816 static int hdev_probe_device(const char *filename)
 817 {
 818     struct stat st;
 819
 820     /* allow a dedicated CD-ROM driver to match with a higher priority */
 821     if (strstart(filename, "/dev/cdrom", NULL))
 822         return 50;
 823
 824     if (stat(filename, &st) >= 0 &&
 825             (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
 826         return 100;
 827     }
 828
 829     return 0;
 830 }
 831
 832 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 833 {
 834     BDRVRawState *s = bs->opaque;
 835
 836 #if defined(__APPLE__) && defined(__MACH__)
 837     if (strstart(filename, "/dev/cdrom", NULL)) {
 838         kern_return_t kernResult;
 839         io_iterator_t mediaIterator;
 840         char bsdPath[ MAXPATHLEN ];
 841         int fd;
 842
 843         kernResult = FindEjectableCDMedia( &mediaIterator );
 844         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 845
 846         if ( bsdPath[ 0 ] != '\0' ) {
 847             strcat(bsdPath,"s0");
 848             /* some CDs don't have a partition 0 */
 849             fd = qemu_open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 850             if (fd < 0) {
 851                 bsdPath[strlen(bsdPath)-1] = '1';
 852             } else {
 853                 qemu_close(fd);
 854             }
 855             filename = bsdPath;
 856         }
 857
 858         if ( mediaIterator )
 859             IOObjectRelease( mediaIterator );
 860     }
 861 #endif
 862
 863     s->type = FTYPE_FILE;
 864 #if defined(__linux__)
 865     {
 866         char resolved_path[ MAXPATHLEN ], *temp;
 867
 868         temp = realpath(filename, resolved_path);
 869         if (temp && strstart(temp, "/dev/sg", NULL)) {
 870             bs->sg = 1;
 871         }
 872     }
 873 #endif
 874
 875     return raw_open_common(bs, filename, flags, 0);
 876 }
 877
 878 #if defined(__linux__)
 879 /* Note: we do not have a reliable method to detect if the floppy is
 880    present. The current method is to try to open the floppy at every
 881    I/O and to keep it opened during a few hundreds of ms. */
 882 static int fd_open(BlockDriverState *bs)
 883 {
 884     BDRVRawState *s = bs->opaque;
 885     int last_media_present;
 886
 887     if (s->type != FTYPE_FD)
 888         return 0;
 889     last_media_present = (s->fd >= 0);
 890     if (s->fd >= 0 &&
 891         (get_clock() - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
 892         qemu_close(s->fd);
 893         s->fd = -1;
 894 #ifdef DEBUG_FLOPPY
 895         printf("Floppy closed\n");
 896 #endif
 897     }
 898     if (s->fd < 0) {
 899         if (s->fd_got_error &&
 900             (get_clock() - s->fd_error_time) < FD_OPEN_TIMEOUT) {
 901 #ifdef DEBUG_FLOPPY
 902             printf("No floppy (open delayed)\n");
 903 #endif
 904             return -EIO;
 905         }
 906         s->fd = qemu_open(bs->filename, s->open_flags & ~O_NONBLOCK);
 907         if (s->fd < 0) {
 908             s->fd_error_time = get_clock();
 909             s->fd_got_error = 1;
 910             if (last_media_present)
 911                 s->fd_media_changed = 1;
 912 #ifdef DEBUG_FLOPPY
 913             printf("No floppy\n");
 914 #endif
 915             return -EIO;
 916         }
 917 #ifdef DEBUG_FLOPPY
 918         printf("Floppy opened\n");
 919 #endif
 920     }
 921     if (!last_media_present)
 922         s->fd_media_changed = 1;
 923     s->fd_open_time = get_clock();
 924     s->fd_got_error = 0;
 925     return 0;
 926 }
 927
 928 static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 929 {
 930     BDRVRawState *s = bs->opaque;
 931
 932     return ioctl(s->fd, req, buf);
 933 }
 934
 935 static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
 936         unsigned long int req, void *buf,
 937         BlockDriverCompletionFunc *cb, void *opaque)
 938 {
 939     BDRVRawState *s = bs->opaque;
 940
 941     if (fd_open(bs) < 0)
 942         return NULL;
 943     return paio_ioctl(bs, s->fd, req, buf, cb, opaque);
 944 }
 945
 946 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 947 static int fd_open(BlockDriverState *bs)
 948 {
 949     BDRVRawState *s = bs->opaque;
 950
 951     /* this is just to ensure s->fd is sane (its called by io ops) */
 952     if (s->fd >= 0)
 953         return 0;
 954     return -EIO;
 955 }
 956 #else /* !linux && !FreeBSD */
 957
 958 static int fd_open(BlockDriverState *bs)
 959 {
 960     return 0;
 961 }
 962
 963 #endif /* !linux && !FreeBSD */
 964
 965 static int hdev_create(const char *filename, QEMUOptionParameter *options)
 966 {
 967     int fd;
 968     int ret = 0;
 969     struct stat stat_buf;
 970     int64_t total_size = 0;
 971
 972     /* Read out options */
 973     while (options && options->name) {
 974         if (!strcmp(options->name, "size")) {
 975             total_size = options->value.n / BDRV_SECTOR_SIZE;
 976         }
 977         options++;
 978     }
 979
 980     fd = qemu_open(filename, O_WRONLY | O_BINARY);
 981     if (fd < 0)
 982         return -errno;
 983
 984     if (fstat(fd, &stat_buf) < 0)
 985         ret = -errno;
 986     else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
 987         ret = -ENODEV;
 988     else if (lseek(fd, 0, SEEK_END) < total_size * BDRV_SECTOR_SIZE)
 989         ret = -ENOSPC;
 990
 991     qemu_close(fd);
 992     return ret;
 993 }
 994
 995 static int hdev_has_zero_init(BlockDriverState *bs)
 996 {
 997     return 0;
 998 }
 999
1000 static BlockDriver bdrv_host_device = {
1001     .format_name        = "host_device",
1002     .protocol_name        = "host_device",
1003     .instance_size      = sizeof(BDRVRawState),
1004     .bdrv_probe_device  = hdev_probe_device,
1005     .bdrv_file_open     = hdev_open,
1006     .bdrv_close         = raw_close,
1007     .bdrv_create        = hdev_create,
1008     .create_options     = raw_create_options,
1009     .bdrv_has_zero_init = hdev_has_zero_init,
1010
1011     .bdrv_aio_readv     = raw_aio_readv,
1012     .bdrv_aio_writev    = raw_aio_writev,
1013     .bdrv_aio_flush     = raw_aio_flush,
1014
1015     .bdrv_truncate      = raw_truncate,
1016     .bdrv_getlength     = raw_getlength,
1017     .bdrv_get_allocated_file_size
1018                         = raw_get_allocated_file_size,
1019
1020     /* generic scsi device */
1021 #ifdef __linux__
1022     .bdrv_ioctl         = hdev_ioctl,
1023     .bdrv_aio_ioctl     = hdev_aio_ioctl,
1024 #endif
1025 };
1026
1027 #ifdef __linux__
1028 static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
1029 {
1030     BDRVRawState *s = bs->opaque;
1031     int ret;
1032
1033     s->type = FTYPE_FD;
1034
1035     /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
1036     ret = raw_open_common(bs, filename, flags, O_NONBLOCK);
1037     if (ret)
1038         return ret;
1039
1040     /* close fd so that we can reopen it as needed */
1041     qemu_close(s->fd);
1042     s->fd = -1;
1043     s->fd_media_changed = 1;
1044
1045     return 0;
1046 }
1047
1048 static int floppy_probe_device(const char *filename)
1049 {
1050     int fd, ret;
1051     int prio = 0;
1052     struct floppy_struct fdparam;
1053     struct stat st;
1054
1055     if (strstart(filename, "/dev/fd", NULL) &&
1056         !strstart(filename, "/dev/fdset/", NULL)) {
1057         prio = 50;
1058     }
1059
1060     fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
1061     if (fd < 0) {
1062         goto out;
1063     }
1064     ret = fstat(fd, &st);
1065     if (ret == -1 || !S_ISBLK(st.st_mode)) {
1066         goto outc;
1067     }
1068
1069     /* Attempt to detect via a floppy specific ioctl */
1070     ret = ioctl(fd, FDGETPRM, &fdparam);
1071     if (ret >= 0)
1072         prio = 100;
1073
1074 outc:
1075     qemu_close(fd);
1076 out:
1077     return prio;
1078 }
1079
1080
1081 static int floppy_is_inserted(BlockDriverState *bs)
1082 {
1083     return fd_open(bs) >= 0;
1084 }
1085
1086 static int floppy_media_changed(BlockDriverState *bs)
1087 {
1088     BDRVRawState *s = bs->opaque;
1089     int ret;
1090
1091     /*
1092      * XXX: we do not have a true media changed indication.
1093      * It does not work if the floppy is changed without trying to read it.
1094      */
1095     fd_open(bs);
1096     ret = s->fd_media_changed;
1097     s->fd_media_changed = 0;
1098 #ifdef DEBUG_FLOPPY
1099     printf("Floppy changed=%d\n", ret);
1100 #endif
1101     return ret;
1102 }
1103
1104 static void floppy_eject(BlockDriverState *bs, bool eject_flag)
1105 {
1106     BDRVRawState *s = bs->opaque;
1107     int fd;
1108
1109     if (s->fd >= 0) {
1110         qemu_close(s->fd);
1111         s->fd = -1;
1112     }
1113     fd = qemu_open(bs->filename, s->open_flags | O_NONBLOCK);
1114     if (fd >= 0) {
1115         if (ioctl(fd, FDEJECT, 0) < 0)
1116             perror("FDEJECT");
1117         qemu_close(fd);
1118     }
1119 }
1120
1121 static BlockDriver bdrv_host_floppy = {
1122     .format_name        = "host_floppy",
1123     .protocol_name      = "host_floppy",
1124     .instance_size      = sizeof(BDRVRawState),
1125     .bdrv_probe_device  = floppy_probe_device,
1126     .bdrv_file_open     = floppy_open,
1127     .bdrv_close         = raw_close,
1128     .bdrv_create        = hdev_create,
1129     .create_options     = raw_create_options,
1130     .bdrv_has_zero_init = hdev_has_zero_init,
1131
1132     .bdrv_aio_readv     = raw_aio_readv,
1133     .bdrv_aio_writev    = raw_aio_writev,
1134     .bdrv_aio_flush     = raw_aio_flush,
1135
1136     .bdrv_truncate      = raw_truncate,
1137     .bdrv_getlength     = raw_getlength,
1138     .bdrv_get_allocated_file_size
1139                         = raw_get_allocated_file_size,
1140
1141     /* removable device support */
1142     .bdrv_is_inserted   = floppy_is_inserted,
1143     .bdrv_media_changed = floppy_media_changed,
1144     .bdrv_eject         = floppy_eject,
1145 };
1146
1147 static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
1148 {
1149     BDRVRawState *s = bs->opaque;
1150
1151     s->type = FTYPE_CD;
1152
1153     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
1154     return raw_open_common(bs, filename, flags, O_NONBLOCK);
1155 }
1156
1157 static int cdrom_probe_device(const char *filename)
1158 {
1159     int fd, ret;
1160     int prio = 0;
1161     struct stat st;
1162
1163     fd = qemu_open(filename, O_RDONLY | O_NONBLOCK);
1164     if (fd < 0) {
1165         goto out;
1166     }
1167     ret = fstat(fd, &st);
1168     if (ret == -1 || !S_ISBLK(st.st_mode)) {
1169         goto outc;
1170     }
1171
1172     /* Attempt to detect via a CDROM specific ioctl */
1173     ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1174     if (ret >= 0)
1175         prio = 100;
1176
1177 outc:
1178     qemu_close(fd);
1179 out:
1180     return prio;
1181 }
1182
1183 static int cdrom_is_inserted(BlockDriverState *bs)
1184 {
1185     BDRVRawState *s = bs->opaque;
1186     int ret;
1187
1188     ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1189     if (ret == CDS_DISC_OK)
1190         return 1;
1191     return 0;
1192 }
1193
1194 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
1195 {
1196     BDRVRawState *s = bs->opaque;
1197
1198     if (eject_flag) {
1199         if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
1200             perror("CDROMEJECT");
1201     } else {
1202         if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
1203             perror("CDROMEJECT");
1204     }
1205 }
1206
1207 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
1208 {
1209     BDRVRawState *s = bs->opaque;
1210
1211     if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
1212         /*
1213          * Note: an error can happen if the distribution automatically
1214          * mounts the CD-ROM
1215          */
1216         /* perror("CDROM_LOCKDOOR"); */
1217     }
1218 }
1219
1220 static BlockDriver bdrv_host_cdrom = {
1221     .format_name        = "host_cdrom",
1222     .protocol_name      = "host_cdrom",
1223     .instance_size      = sizeof(BDRVRawState),
1224     .bdrv_probe_device  = cdrom_probe_device,
1225     .bdrv_file_open     = cdrom_open,
1226     .bdrv_close         = raw_close,
1227     .bdrv_create        = hdev_create,
1228     .create_options     = raw_create_options,
1229     .bdrv_has_zero_init = hdev_has_zero_init,
1230
1231     .bdrv_aio_readv     = raw_aio_readv,
1232     .bdrv_aio_writev    = raw_aio_writev,
1233     .bdrv_aio_flush     = raw_aio_flush,
1234
1235     .bdrv_truncate      = raw_truncate,
1236     .bdrv_getlength     = raw_getlength,
1237     .bdrv_get_allocated_file_size
1238                         = raw_get_allocated_file_size,
1239
1240     /* removable device support */
1241     .bdrv_is_inserted   = cdrom_is_inserted,
1242     .bdrv_eject         = cdrom_eject,
1243     .bdrv_lock_medium   = cdrom_lock_medium,
1244
1245     /* generic scsi device */
1246     .bdrv_ioctl         = hdev_ioctl,
1247     .bdrv_aio_ioctl     = hdev_aio_ioctl,
1248 };
1249 #endif /* __linux__ */
1250
1251 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1252 static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
1253 {
1254     BDRVRawState *s = bs->opaque;
1255     int ret;
1256
1257     s->type = FTYPE_CD;
1258
1259     ret = raw_open_common(bs, filename, flags, 0);
1260     if (ret)
1261         return ret;
1262
1263     /* make sure the door isn't locked at this time */
1264     ioctl(s->fd, CDIOCALLOW);
1265     return 0;
1266 }
1267
1268 static int cdrom_probe_device(const char *filename)
1269 {
1270     if (strstart(filename, "/dev/cd", NULL) ||
1271             strstart(filename, "/dev/acd", NULL))
1272         return 100;
1273     return 0;
1274 }
1275
1276 static int cdrom_reopen(BlockDriverState *bs)
1277 {
1278     BDRVRawState *s = bs->opaque;
1279     int fd;
1280
1281     /*
1282      * Force reread of possibly changed/newly loaded disc,
1283      * FreeBSD seems to not notice sometimes...
1284      */
1285     if (s->fd >= 0)
1286         qemu_close(s->fd);
1287     fd = qemu_open(bs->filename, s->open_flags, 0644);
1288     if (fd < 0) {
1289         s->fd = -1;
1290         return -EIO;
1291     }
1292     s->fd = fd;
1293
1294     /* make sure the door isn't locked at this time */
1295     ioctl(s->fd, CDIOCALLOW);
1296     return 0;
1297 }
1298
1299 static int cdrom_is_inserted(BlockDriverState *bs)
1300 {
1301     return raw_getlength(bs) > 0;
1302 }
1303
1304 static void cdrom_eject(BlockDriverState *bs, bool eject_flag)
1305 {
1306     BDRVRawState *s = bs->opaque;
1307
1308     if (s->fd < 0)
1309         return;
1310
1311     (void) ioctl(s->fd, CDIOCALLOW);
1312
1313     if (eject_flag) {
1314         if (ioctl(s->fd, CDIOCEJECT) < 0)
1315             perror("CDIOCEJECT");
1316     } else {
1317         if (ioctl(s->fd, CDIOCCLOSE) < 0)
1318             perror("CDIOCCLOSE");
1319     }
1320
1321     cdrom_reopen(bs);
1322 }
1323
1324 static void cdrom_lock_medium(BlockDriverState *bs, bool locked)
1325 {
1326     BDRVRawState *s = bs->opaque;
1327
1328     if (s->fd < 0)
1329         return;
1330     if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
1331         /*
1332          * Note: an error can happen if the distribution automatically
1333          * mounts the CD-ROM
1334          */
1335         /* perror("CDROM_LOCKDOOR"); */
1336     }
1337 }
1338
1339 static BlockDriver bdrv_host_cdrom = {
1340     .format_name        = "host_cdrom",
1341     .protocol_name      = "host_cdrom",
1342     .instance_size      = sizeof(BDRVRawState),
1343     .bdrv_probe_device  = cdrom_probe_device,
1344     .bdrv_file_open     = cdrom_open,
1345     .bdrv_close         = raw_close,
1346     .bdrv_create        = hdev_create,
1347     .create_options     = raw_create_options,
1348     .bdrv_has_zero_init = hdev_has_zero_init,
1349
1350     .bdrv_aio_readv     = raw_aio_readv,
1351     .bdrv_aio_writev    = raw_aio_writev,
1352     .bdrv_aio_flush     = raw_aio_flush,
1353
1354     .bdrv_truncate      = raw_truncate,
1355     .bdrv_getlength     = raw_getlength,
1356     .bdrv_get_allocated_file_size
1357                         = raw_get_allocated_file_size,
1358
1359     /* removable device support */
1360     .bdrv_is_inserted   = cdrom_is_inserted,
1361     .bdrv_eject         = cdrom_eject,
1362     .bdrv_lock_medium   = cdrom_lock_medium,
1363 };
1364 #endif /* __FreeBSD__ */
1365
1366 static void bdrv_file_init(void)
1367 {
1368     /*
1369      * Register all the drivers.  Note that order is important, the driver
1370      * registered last will get probed first.
1371      */
1372     bdrv_register(&bdrv_file);
1373     bdrv_register(&bdrv_host_device);
1374 #ifdef __linux__
1375     bdrv_register(&bdrv_host_floppy);
1376     bdrv_register(&bdrv_host_cdrom);
1377 #endif
1378 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1379     bdrv_register(&bdrv_host_cdrom);
1380 #endif
1381 }
1382
1383 block_init(bdrv_file_init);