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 #ifdef CONFIG_COCOA
  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 <signal.h>
  47 #include <sys/dkio.h>
  48 #endif
  49 #ifdef __linux__
  50 #include <sys/ioctl.h>
  51 #include <linux/cdrom.h>
  52 #include <linux/fd.h>
  53 #endif
  54 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
  55 #include <signal.h>
  56 #include <sys/disk.h>
  57 #include <sys/cdio.h>
  58 #endif
  59
  60 #ifdef __OpenBSD__
  61 #include <sys/ioctl.h>
  62 #include <sys/disklabel.h>
  63 #include <sys/dkio.h>
  64 #endif
  65
  66 #ifdef __DragonFly__
  67 #include <sys/ioctl.h>
  68 #include <sys/diskslice.h>
  69 #endif
  70
  71 //#define DEBUG_FLOPPY
  72
  73 //#define DEBUG_BLOCK
  74 #if defined(DEBUG_BLOCK)
  75 #define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \
  76     { qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0)
  77 #else
  78 #define DEBUG_BLOCK_PRINT(formatCstr, ...)
  79 #endif
  80
  81 /* OS X does not have O_DSYNC */
  82 #ifndef O_DSYNC
  83 #ifdef O_SYNC
  84 #define O_DSYNC O_SYNC
  85 #elif defined(O_FSYNC)
  86 #define O_DSYNC O_FSYNC
  87 #endif
  88 #endif
  89
  90 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
  91 #ifndef O_DIRECT
  92 #define O_DIRECT O_DSYNC
  93 #endif
  94
  95 #define FTYPE_FILE   0
  96 #define FTYPE_CD     1
  97 #define FTYPE_FD     2
  98
  99 #define ALIGNED_BUFFER_SIZE (32 * 512)
 100
 101 /* if the FD is not accessed during that time (in ms), we try to
 102    reopen it to see if the disk has been changed */
 103 #define FD_OPEN_TIMEOUT 1000
 104
 105 typedef struct BDRVRawState {
 106     int fd;
 107     int type;
 108     unsigned int lseek_err_cnt;
 109     int open_flags;
 110 #if defined(__linux__)
 111     /* linux floppy specific */
 112     int64_t fd_open_time;
 113     int64_t fd_error_time;
 114     int fd_got_error;
 115     int fd_media_changed;
 116 #endif
 117 #ifdef CONFIG_LINUX_AIO
 118     int use_aio;
 119     void *aio_ctx;
 120 #endif
 121     uint8_t* aligned_buf;
 122 } BDRVRawState;
 123
 124 static int fd_open(BlockDriverState *bs);
 125 static int64_t raw_getlength(BlockDriverState *bs);
 126
 127 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 128 static int cdrom_reopen(BlockDriverState *bs);
 129 #endif
 130
 131 static int raw_open_common(BlockDriverState *bs, const char *filename,
 132                            int bdrv_flags, int open_flags)
 133 {
 134     BDRVRawState *s = bs->opaque;
 135     int fd, ret;
 136
 137     s->lseek_err_cnt = 0;
 138
 139     s->open_flags = open_flags | O_BINARY;
 140     s->open_flags &= ~O_ACCMODE;
 141     if (bdrv_flags & BDRV_O_RDWR) {
 142         s->open_flags |= O_RDWR;
 143     } else {
 144         s->open_flags |= O_RDONLY;
 145     }
 146
 147     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
 148      * and O_DIRECT for no caching. */
 149     if ((bdrv_flags & BDRV_O_NOCACHE))
 150         s->open_flags |= O_DIRECT;
 151     else if (!(bdrv_flags & BDRV_O_CACHE_WB))
 152         s->open_flags |= O_DSYNC;
 153
 154     s->fd = -1;
 155     fd = qemu_open(filename, s->open_flags, 0644);
 156     if (fd < 0) {
 157         ret = -errno;
 158         if (ret == -EROFS)
 159             ret = -EACCES;
 160         return ret;
 161     }
 162     s->fd = fd;
 163     s->aligned_buf = NULL;
 164
 165     if ((bdrv_flags & BDRV_O_NOCACHE)) {
 166         s->aligned_buf = qemu_blockalign(bs, ALIGNED_BUFFER_SIZE);
 167         if (s->aligned_buf == NULL) {
 168             goto out_close;
 169         }
 170     }
 171
 172 #ifdef CONFIG_LINUX_AIO
 173     if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
 174                       (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
 175
 176         /* We're falling back to POSIX AIO in some cases */
 177         paio_init();
 178
 179         s->aio_ctx = laio_init();
 180         if (!s->aio_ctx) {
 181             goto out_free_buf;
 182         }
 183         s->use_aio = 1;
 184     } else
 185 #endif
 186     {
 187         if (paio_init() < 0) {
 188             goto out_free_buf;
 189         }
 190 #ifdef CONFIG_LINUX_AIO
 191         s->use_aio = 0;
 192 #endif
 193     }
 194
 195     return 0;
 196
 197 out_free_buf:
 198     qemu_vfree(s->aligned_buf);
 199 out_close:
 200     close(fd);
 201     return -errno;
 202 }
 203
 204 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 205 {
 206     BDRVRawState *s = bs->opaque;
 207
 208     s->type = FTYPE_FILE;
 209     return raw_open_common(bs, filename, flags, 0);
 210 }
 211
 212 /* XXX: use host sector size if necessary with:
 213 #ifdef DIOCGSECTORSIZE
 214         {
 215             unsigned int sectorsize = 512;
 216             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 217                 sectorsize > bufsize)
 218                 bufsize = sectorsize;
 219         }
 220 #endif
 221 #ifdef CONFIG_COCOA
 222         u_int32_t   blockSize = 512;
 223         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 224             bufsize = blockSize;
 225         }
 226 #endif
 227 */
 228
 229 /*
 230  * offset and count are in bytes, but must be multiples of 512 for files
 231  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 232  *
 233  * This function may be called without alignment if the caller ensures
 234  * that O_DIRECT is not in effect.
 235  */
 236 static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
 237                      uint8_t *buf, int count)
 238 {
 239     BDRVRawState *s = bs->opaque;
 240     int ret;
 241
 242     ret = fd_open(bs);
 243     if (ret < 0)
 244         return ret;
 245
 246     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 247         ++(s->lseek_err_cnt);
 248         if(s->lseek_err_cnt <= 10) {
 249             DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 250                               "] lseek failed : %d = %s\n",
 251                               s->fd, bs->filename, offset, buf, count,
 252                               bs->total_sectors, errno, strerror(errno));
 253         }
 254         return -1;
 255     }
 256     s->lseek_err_cnt=0;
 257
 258     ret = read(s->fd, buf, count);
 259     if (ret == count)
 260         goto label__raw_read__success;
 261
 262     /* Allow reads beyond the end (needed for pwrite) */
 263     if ((ret == 0) && bs->growable) {
 264         int64_t size = raw_getlength(bs);
 265         if (offset >= size) {
 266             memset(buf, 0, count);
 267             ret = count;
 268             goto label__raw_read__success;
 269         }
 270     }
 271
 272     DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 273                       "] read failed %d : %d = %s\n",
 274                       s->fd, bs->filename, offset, buf, count,
 275                       bs->total_sectors, ret, errno, strerror(errno));
 276
 277     /* Try harder for CDrom. */
 278     if (bs->type == BDRV_TYPE_CDROM) {
 279         lseek(s->fd, offset, SEEK_SET);
 280         ret = read(s->fd, buf, count);
 281         if (ret == count)
 282             goto label__raw_read__success;
 283         lseek(s->fd, offset, SEEK_SET);
 284         ret = read(s->fd, buf, count);
 285         if (ret == count)
 286             goto label__raw_read__success;
 287
 288         DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 289                           "] retry read failed %d : %d = %s\n",
 290                           s->fd, bs->filename, offset, buf, count,
 291                           bs->total_sectors, ret, errno, strerror(errno));
 292     }
 293
 294 label__raw_read__success:
 295
 296     return  (ret < 0) ? -errno : ret;
 297 }
 298
 299 /*
 300  * offset and count are in bytes, but must be multiples of 512 for files
 301  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 302  *
 303  * This function may be called without alignment if the caller ensures
 304  * that O_DIRECT is not in effect.
 305  */
 306 static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
 307                       const uint8_t *buf, int count)
 308 {
 309     BDRVRawState *s = bs->opaque;
 310     int ret;
 311
 312     ret = fd_open(bs);
 313     if (ret < 0)
 314         return -errno;
 315
 316     if (offset >= 0 && lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 317         ++(s->lseek_err_cnt);
 318         if(s->lseek_err_cnt) {
 319             DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%"
 320                               PRId64 "] lseek failed : %d = %s\n",
 321                               s->fd, bs->filename, offset, buf, count,
 322                               bs->total_sectors, errno, strerror(errno));
 323         }
 324         return -EIO;
 325     }
 326     s->lseek_err_cnt = 0;
 327
 328     ret = write(s->fd, buf, count);
 329     if (ret == count)
 330         goto label__raw_write__success;
 331
 332     DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 333                       "] write failed %d : %d = %s\n",
 334                       s->fd, bs->filename, offset, buf, count,
 335                       bs->total_sectors, ret, errno, strerror(errno));
 336
 337 label__raw_write__success:
 338
 339     return  (ret < 0) ? -errno : ret;
 340 }
 341
 342
 343 /*
 344  * offset and count are in bytes and possibly not aligned. For files opened
 345  * with O_DIRECT, necessary alignments are ensured before calling
 346  * raw_pread_aligned to do the actual read.
 347  */
 348 static int raw_pread(BlockDriverState *bs, int64_t offset,
 349                      uint8_t *buf, int count)
 350 {
 351     BDRVRawState *s = bs->opaque;
 352     int size, ret, shift, sum;
 353
 354     sum = 0;
 355
 356     if (s->aligned_buf != NULL)  {
 357
 358         if (offset & 0x1ff) {
 359             /* align offset on a 512 bytes boundary */
 360
 361             shift = offset & 0x1ff;
 362             size = (shift + count + 0x1ff) & ~0x1ff;
 363             if (size > ALIGNED_BUFFER_SIZE)
 364                 size = ALIGNED_BUFFER_SIZE;
 365             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
 366             if (ret < 0)
 367                 return ret;
 368
 369             size = 512 - shift;
 370             if (size > count)
 371                 size = count;
 372             memcpy(buf, s->aligned_buf + shift, size);
 373
 374             buf += size;
 375             offset += size;
 376             count -= size;
 377             sum += size;
 378
 379             if (count == 0)
 380                 return sum;
 381         }
 382         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 383
 384             /* read on aligned buffer */
 385
 386             while (count) {
 387
 388                 size = (count + 0x1ff) & ~0x1ff;
 389                 if (size > ALIGNED_BUFFER_SIZE)
 390                     size = ALIGNED_BUFFER_SIZE;
 391
 392                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
 393                 if (ret < 0) {
 394                     return ret;
 395                 } else if (ret == 0) {
 396                     fprintf(stderr, "raw_pread: read beyond end of file\n");
 397                     abort();
 398                 }
 399
 400                 size = ret;
 401                 if (size > count)
 402                     size = count;
 403
 404                 memcpy(buf, s->aligned_buf, size);
 405
 406                 buf += size;
 407                 offset += size;
 408                 count -= size;
 409                 sum += size;
 410             }
 411
 412             return sum;
 413         }
 414     }
 415
 416     return raw_pread_aligned(bs, offset, buf, count) + sum;
 417 }
 418
 419 static int raw_read(BlockDriverState *bs, int64_t sector_num,
 420                     uint8_t *buf, int nb_sectors)
 421 {
 422     int ret;
 423
 424     ret = raw_pread(bs, sector_num * 512, buf, nb_sectors * 512);
 425     if (ret == (nb_sectors * 512))
 426         ret = 0;
 427     return ret;
 428 }
 429
 430 /*
 431  * offset and count are in bytes and possibly not aligned. For files opened
 432  * with O_DIRECT, necessary alignments are ensured before calling
 433  * raw_pwrite_aligned to do the actual write.
 434  */
 435 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 436                       const uint8_t *buf, int count)
 437 {
 438     BDRVRawState *s = bs->opaque;
 439     int size, ret, shift, sum;
 440
 441     sum = 0;
 442
 443     if (s->aligned_buf != NULL) {
 444
 445         if (offset & 0x1ff) {
 446             /* align offset on a 512 bytes boundary */
 447             shift = offset & 0x1ff;
 448             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, 512);
 449             if (ret < 0)
 450                 return ret;
 451
 452             size = 512 - shift;
 453             if (size > count)
 454                 size = count;
 455             memcpy(s->aligned_buf + shift, buf, size);
 456
 457             ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf, 512);
 458             if (ret < 0)
 459                 return ret;
 460
 461             buf += size;
 462             offset += size;
 463             count -= size;
 464             sum += size;
 465
 466             if (count == 0)
 467                 return sum;
 468         }
 469         if (count & 0x1ff || (uintptr_t) buf & 0x1ff) {
 470
 471             while ((size = (count & ~0x1ff)) != 0) {
 472
 473                 if (size > ALIGNED_BUFFER_SIZE)
 474                     size = ALIGNED_BUFFER_SIZE;
 475
 476                 memcpy(s->aligned_buf, buf, size);
 477
 478                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
 479                 if (ret < 0)
 480                     return ret;
 481
 482                 buf += ret;
 483                 offset += ret;
 484                 count -= ret;
 485                 sum += ret;
 486             }
 487             /* here, count < 512 because (count & ~0x1ff) == 0 */
 488             if (count) {
 489                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, 512);
 490                 if (ret < 0)
 491                     return ret;
 492                  memcpy(s->aligned_buf, buf, count);
 493
 494                  ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, 512);
 495                  if (ret < 0)
 496                      return ret;
 497                  if (count < ret)
 498                      ret = count;
 499
 500                  sum += ret;
 501             }
 502             return sum;
 503         }
 504     }
 505     return raw_pwrite_aligned(bs, offset, buf, count) + sum;
 506 }
 507
 508 static int raw_write(BlockDriverState *bs, int64_t sector_num,
 509                      const uint8_t *buf, int nb_sectors)
 510 {
 511     int ret;
 512     ret = raw_pwrite(bs, sector_num * 512, buf, nb_sectors * 512);
 513     if (ret == (nb_sectors * 512))
 514         ret = 0;
 515     return ret;
 516 }
 517
 518 /*
 519  * Check if all memory in this vector is sector aligned.
 520  */
 521 static int qiov_is_aligned(QEMUIOVector *qiov)
 522 {
 523     int i;
 524
 525     for (i = 0; i < qiov->niov; i++) {
 526         if ((uintptr_t) qiov->iov[i].iov_base % 512) {
 527             return 0;
 528         }
 529     }
 530
 531     return 1;
 532 }
 533
 534 static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
 535         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 536         BlockDriverCompletionFunc *cb, void *opaque, int type)
 537 {
 538     BDRVRawState *s = bs->opaque;
 539
 540     if (fd_open(bs) < 0)
 541         return NULL;
 542
 543     /*
 544      * If O_DIRECT is used the buffer needs to be aligned on a sector
 545      * boundary.  Check if this is the case or telll the low-level
 546      * driver that it needs to copy the buffer.
 547      */
 548     if (s->aligned_buf) {
 549         if (!qiov_is_aligned(qiov)) {
 550             type |= QEMU_AIO_MISALIGNED;
 551 #ifdef CONFIG_LINUX_AIO
 552         } else if (s->use_aio) {
 553             return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
 554                                nb_sectors, cb, opaque, type);
 555 #endif
 556         }
 557     }
 558
 559     return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
 560                        cb, opaque, type);
 561 }
 562
 563 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
 564         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 565         BlockDriverCompletionFunc *cb, void *opaque)
 566 {
 567     return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
 568                           cb, opaque, QEMU_AIO_READ);
 569 }
 570
 571 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
 572         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 573         BlockDriverCompletionFunc *cb, void *opaque)
 574 {
 575     return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
 576                           cb, opaque, QEMU_AIO_WRITE);
 577 }
 578
 579 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
 580         BlockDriverCompletionFunc *cb, void *opaque)
 581 {
 582     BDRVRawState *s = bs->opaque;
 583
 584     if (fd_open(bs) < 0)
 585         return NULL;
 586
 587     return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 588 }
 589
 590 static void raw_close(BlockDriverState *bs)
 591 {
 592     BDRVRawState *s = bs->opaque;
 593     if (s->fd >= 0) {
 594         close(s->fd);
 595         s->fd = -1;
 596         if (s->aligned_buf != NULL)
 597             qemu_vfree(s->aligned_buf);
 598     }
 599 }
 600
 601 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 602 {
 603     BDRVRawState *s = bs->opaque;
 604     if (s->type != FTYPE_FILE)
 605         return -ENOTSUP;
 606     if (ftruncate(s->fd, offset) < 0)
 607         return -errno;
 608     return 0;
 609 }
 610
 611 #ifdef __OpenBSD__
 612 static int64_t raw_getlength(BlockDriverState *bs)
 613 {
 614     BDRVRawState *s = bs->opaque;
 615     int fd = s->fd;
 616     struct stat st;
 617
 618     if (fstat(fd, &st))
 619         return -1;
 620     if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 621         struct disklabel dl;
 622
 623         if (ioctl(fd, DIOCGDINFO, &dl))
 624             return -1;
 625         return (uint64_t)dl.d_secsize *
 626             dl.d_partitions[DISKPART(st.st_rdev)].p_size;
 627     } else
 628         return st.st_size;
 629 }
 630 #else /* !__OpenBSD__ */
 631 static int64_t  raw_getlength(BlockDriverState *bs)
 632 {
 633     BDRVRawState *s = bs->opaque;
 634     int fd = s->fd;
 635     int64_t size;
 636 #ifdef CONFIG_BSD
 637     struct stat sb;
 638 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 639     int reopened = 0;
 640 #endif
 641 #endif
 642 #ifdef __sun__
 643     struct dk_minfo minfo;
 644     int rv;
 645 #endif
 646     int ret;
 647
 648     ret = fd_open(bs);
 649     if (ret < 0)
 650         return ret;
 651
 652 #ifdef CONFIG_BSD
 653 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 654 again:
 655 #endif
 656     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 657 #ifdef DIOCGMEDIASIZE
 658         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 659 #elif defined(DIOCGPART)
 660         {
 661                 struct partinfo pi;
 662                 if (ioctl(fd, DIOCGPART, &pi) == 0)
 663                         size = pi.media_size;
 664                 else
 665                         size = 0;
 666         }
 667         if (size == 0)
 668 #endif
 669 #ifdef CONFIG_COCOA
 670         size = LONG_LONG_MAX;
 671 #else
 672         size = lseek(fd, 0LL, SEEK_END);
 673 #endif
 674 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 675         switch(s->type) {
 676         case FTYPE_CD:
 677             /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
 678             if (size == 2048LL * (unsigned)-1)
 679                 size = 0;
 680             /* XXX no disc?  maybe we need to reopen... */
 681             if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
 682                 reopened = 1;
 683                 goto again;
 684             }
 685         }
 686 #endif
 687     } else
 688 #endif
 689 #ifdef __sun__
 690     /*
 691      * use the DKIOCGMEDIAINFO ioctl to read the size.
 692      */
 693     rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
 694     if ( rv != -1 ) {
 695         size = minfo.dki_lbsize * minfo.dki_capacity;
 696     } else /* there are reports that lseek on some devices
 697               fails, but irc discussion said that contingency
 698               on contingency was overkill */
 699 #endif
 700     {
 701         size = lseek(fd, 0, SEEK_END);
 702     }
 703     return size;
 704 }
 705 #endif
 706
 707 static int raw_create(const char *filename, QEMUOptionParameter *options)
 708 {
 709     int fd;
 710     int result = 0;
 711     int64_t total_size = 0;
 712
 713     /* Read out options */
 714     while (options && options->name) {
 715         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 716             total_size = options->value.n / 512;
 717         }
 718         options++;
 719     }
 720
 721     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 722               0644);
 723     if (fd < 0) {
 724         result = -errno;
 725     } else {
 726         if (ftruncate(fd, total_size * 512) != 0) {
 727             result = -errno;
 728         }
 729         if (close(fd) != 0) {
 730             result = -errno;
 731         }
 732     }
 733     return result;
 734 }
 735
 736 static void raw_flush(BlockDriverState *bs)
 737 {
 738     BDRVRawState *s = bs->opaque;
 739     qemu_fdatasync(s->fd);
 740 }
 741
 742
 743 static QEMUOptionParameter raw_create_options[] = {
 744     {
 745         .name = BLOCK_OPT_SIZE,
 746         .type = OPT_SIZE,
 747         .help = "Virtual disk size"
 748     },
 749     { NULL }
 750 };
 751
 752 static BlockDriver bdrv_raw = {
 753     .format_name = "raw",
 754     .instance_size = sizeof(BDRVRawState),
 755     .bdrv_probe = NULL, /* no probe for protocols */
 756     .bdrv_open = raw_open,
 757     .bdrv_read = raw_read,
 758     .bdrv_write = raw_write,
 759     .bdrv_close = raw_close,
 760     .bdrv_create = raw_create,
 761     .bdrv_flush = raw_flush,
 762
 763     .bdrv_aio_readv = raw_aio_readv,
 764     .bdrv_aio_writev = raw_aio_writev,
 765     .bdrv_aio_flush = raw_aio_flush,
 766
 767     .bdrv_truncate = raw_truncate,
 768     .bdrv_getlength = raw_getlength,
 769
 770     .create_options = raw_create_options,
 771 };
 772
 773 /***********************************************/
 774 /* host device */
 775
 776 #ifdef CONFIG_COCOA
 777 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 778 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 779
 780 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 781 {
 782     kern_return_t       kernResult;
 783     mach_port_t     masterPort;
 784     CFMutableDictionaryRef  classesToMatch;
 785
 786     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 787     if ( KERN_SUCCESS != kernResult ) {
 788         printf( "IOMasterPort returned %d\n", kernResult );
 789     }
 790
 791     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 792     if ( classesToMatch == NULL ) {
 793         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 794     } else {
 795     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 796     }
 797     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 798     if ( KERN_SUCCESS != kernResult )
 799     {
 800         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 801     }
 802
 803     return kernResult;
 804 }
 805
 806 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 807 {
 808     io_object_t     nextMedia;
 809     kern_return_t   kernResult = KERN_FAILURE;
 810     *bsdPath = '\0';
 811     nextMedia = IOIteratorNext( mediaIterator );
 812     if ( nextMedia )
 813     {
 814         CFTypeRef   bsdPathAsCFString;
 815     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 816         if ( bsdPathAsCFString ) {
 817             size_t devPathLength;
 818             strcpy( bsdPath, _PATH_DEV );
 819             strcat( bsdPath, "r" );
 820             devPathLength = strlen( bsdPath );
 821             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 822                 kernResult = KERN_SUCCESS;
 823             }
 824             CFRelease( bsdPathAsCFString );
 825         }
 826         IOObjectRelease( nextMedia );
 827     }
 828
 829     return kernResult;
 830 }
 831
 832 #endif
 833
 834 static int hdev_probe_device(const char *filename)
 835 {
 836     struct stat st;
 837
 838     /* allow a dedicated CD-ROM driver to match with a higher priority */
 839     if (strstart(filename, "/dev/cdrom", NULL))
 840         return 50;
 841
 842     if (stat(filename, &st) >= 0 &&
 843             (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
 844         return 100;
 845     }
 846
 847     return 0;
 848 }
 849
 850 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 851 {
 852     BDRVRawState *s = bs->opaque;
 853
 854 #ifdef CONFIG_COCOA
 855     if (strstart(filename, "/dev/cdrom", NULL)) {
 856         kern_return_t kernResult;
 857         io_iterator_t mediaIterator;
 858         char bsdPath[ MAXPATHLEN ];
 859         int fd;
 860
 861         kernResult = FindEjectableCDMedia( &mediaIterator );
 862         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 863
 864         if ( bsdPath[ 0 ] != '\0' ) {
 865             strcat(bsdPath,"s0");
 866             /* some CDs don't have a partition 0 */
 867             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 868             if (fd < 0) {
 869                 bsdPath[strlen(bsdPath)-1] = '1';
 870             } else {
 871                 close(fd);
 872             }
 873             filename = bsdPath;
 874         }
 875
 876         if ( mediaIterator )
 877             IOObjectRelease( mediaIterator );
 878     }
 879 #endif
 880
 881     s->type = FTYPE_FILE;
 882 #if defined(__linux__)
 883     if (strstart(filename, "/dev/sg", NULL)) {
 884         bs->sg = 1;
 885     }
 886 #endif
 887
 888     return raw_open_common(bs, filename, flags, 0);
 889 }
 890
 891 #if defined(__linux__)
 892 /* Note: we do not have a reliable method to detect if the floppy is
 893    present. The current method is to try to open the floppy at every
 894    I/O and to keep it opened during a few hundreds of ms. */
 895 static int fd_open(BlockDriverState *bs)
 896 {
 897     BDRVRawState *s = bs->opaque;
 898     int last_media_present;
 899
 900     if (s->type != FTYPE_FD)
 901         return 0;
 902     last_media_present = (s->fd >= 0);
 903     if (s->fd >= 0 &&
 904         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
 905         close(s->fd);
 906         s->fd = -1;
 907 #ifdef DEBUG_FLOPPY
 908         printf("Floppy closed\n");
 909 #endif
 910     }
 911     if (s->fd < 0) {
 912         if (s->fd_got_error &&
 913             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
 914 #ifdef DEBUG_FLOPPY
 915             printf("No floppy (open delayed)\n");
 916 #endif
 917             return -EIO;
 918         }
 919         s->fd = open(bs->filename, s->open_flags & ~O_NONBLOCK);
 920         if (s->fd < 0) {
 921             s->fd_error_time = qemu_get_clock(rt_clock);
 922             s->fd_got_error = 1;
 923             if (last_media_present)
 924                 s->fd_media_changed = 1;
 925 #ifdef DEBUG_FLOPPY
 926             printf("No floppy\n");
 927 #endif
 928             return -EIO;
 929         }
 930 #ifdef DEBUG_FLOPPY
 931         printf("Floppy opened\n");
 932 #endif
 933     }
 934     if (!last_media_present)
 935         s->fd_media_changed = 1;
 936     s->fd_open_time = qemu_get_clock(rt_clock);
 937     s->fd_got_error = 0;
 938     return 0;
 939 }
 940
 941 static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 942 {
 943     BDRVRawState *s = bs->opaque;
 944
 945     return ioctl(s->fd, req, buf);
 946 }
 947
 948 static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
 949         unsigned long int req, void *buf,
 950         BlockDriverCompletionFunc *cb, void *opaque)
 951 {
 952     BDRVRawState *s = bs->opaque;
 953
 954     if (fd_open(bs) < 0)
 955         return NULL;
 956     return paio_ioctl(bs, s->fd, req, buf, cb, opaque);
 957 }
 958
 959 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 960 static int fd_open(BlockDriverState *bs)
 961 {
 962     BDRVRawState *s = bs->opaque;
 963
 964     /* this is just to ensure s->fd is sane (its called by io ops) */
 965     if (s->fd >= 0)
 966         return 0;
 967     return -EIO;
 968 }
 969 #else /* !linux && !FreeBSD */
 970
 971 static int fd_open(BlockDriverState *bs)
 972 {
 973     return 0;
 974 }
 975
 976 #endif /* !linux && !FreeBSD */
 977
 978 static int hdev_create(const char *filename, QEMUOptionParameter *options)
 979 {
 980     int fd;
 981     int ret = 0;
 982     struct stat stat_buf;
 983     int64_t total_size = 0;
 984
 985     /* Read out options */
 986     while (options && options->name) {
 987         if (!strcmp(options->name, "size")) {
 988             total_size = options->value.n / 512;
 989         }
 990         options++;
 991     }
 992
 993     fd = open(filename, O_WRONLY | O_BINARY);
 994     if (fd < 0)
 995         return -errno;
 996
 997     if (fstat(fd, &stat_buf) < 0)
 998         ret = -errno;
 999     else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
1000         ret = -ENODEV;
1001     else if (lseek(fd, 0, SEEK_END) < total_size * 512)
1002         ret = -ENOSPC;
1003
1004     close(fd);
1005     return ret;
1006 }
1007
1008 static BlockDriver bdrv_host_device = {
1009     .format_name        = "host_device",
1010     .instance_size      = sizeof(BDRVRawState),
1011     .bdrv_probe_device  = hdev_probe_device,
1012     .bdrv_open          = hdev_open,
1013     .bdrv_close         = raw_close,
1014     .bdrv_create        = hdev_create,
1015     .create_options     = raw_create_options,
1016     .no_zero_init       = 1,
1017     .bdrv_flush         = raw_flush,
1018
1019     .bdrv_aio_readv     = raw_aio_readv,
1020     .bdrv_aio_writev    = raw_aio_writev,
1021     .bdrv_aio_flush     = raw_aio_flush,
1022
1023     .bdrv_read          = raw_read,
1024     .bdrv_write         = raw_write,
1025     .bdrv_getlength     = raw_getlength,
1026
1027     /* generic scsi device */
1028 #ifdef __linux__
1029     .bdrv_ioctl         = hdev_ioctl,
1030     .bdrv_aio_ioctl     = hdev_aio_ioctl,
1031 #endif
1032 };
1033
1034 #ifdef __linux__
1035 static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
1036 {
1037     BDRVRawState *s = bs->opaque;
1038     int ret;
1039
1040     s->type = FTYPE_FD;
1041
1042     /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
1043     ret = raw_open_common(bs, filename, flags, O_NONBLOCK);
1044     if (ret)
1045         return ret;
1046
1047     /* close fd so that we can reopen it as needed */
1048     close(s->fd);
1049     s->fd = -1;
1050     s->fd_media_changed = 1;
1051
1052     return 0;
1053 }
1054
1055 static int floppy_probe_device(const char *filename)
1056 {
1057     int fd, ret;
1058     int prio = 0;
1059     struct floppy_struct fdparam;
1060
1061     if (strstart(filename, "/dev/fd", NULL))
1062         prio = 50;
1063
1064     fd = open(filename, O_RDONLY | O_NONBLOCK);
1065     if (fd < 0) {
1066         goto out;
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     close(fd);
1075 out:
1076     return prio;
1077 }
1078
1079
1080 static int floppy_is_inserted(BlockDriverState *bs)
1081 {
1082     return fd_open(bs) >= 0;
1083 }
1084
1085 static int floppy_media_changed(BlockDriverState *bs)
1086 {
1087     BDRVRawState *s = bs->opaque;
1088     int ret;
1089
1090     /*
1091      * XXX: we do not have a true media changed indication.
1092      * It does not work if the floppy is changed without trying to read it.
1093      */
1094     fd_open(bs);
1095     ret = s->fd_media_changed;
1096     s->fd_media_changed = 0;
1097 #ifdef DEBUG_FLOPPY
1098     printf("Floppy changed=%d\n", ret);
1099 #endif
1100     return ret;
1101 }
1102
1103 static int floppy_eject(BlockDriverState *bs, int eject_flag)
1104 {
1105     BDRVRawState *s = bs->opaque;
1106     int fd;
1107
1108     if (s->fd >= 0) {
1109         close(s->fd);
1110         s->fd = -1;
1111     }
1112     fd = open(bs->filename, s->open_flags | O_NONBLOCK);
1113     if (fd >= 0) {
1114         if (ioctl(fd, FDEJECT, 0) < 0)
1115             perror("FDEJECT");
1116         close(fd);
1117     }
1118
1119     return 0;
1120 }
1121
1122 static BlockDriver bdrv_host_floppy = {
1123     .format_name        = "host_floppy",
1124     .instance_size      = sizeof(BDRVRawState),
1125     .bdrv_probe_device  = floppy_probe_device,
1126     .bdrv_open          = floppy_open,
1127     .bdrv_close         = raw_close,
1128     .bdrv_create        = hdev_create,
1129     .create_options     = raw_create_options,
1130     .no_zero_init       = 1,
1131     .bdrv_flush         = raw_flush,
1132
1133     .bdrv_aio_readv     = raw_aio_readv,
1134     .bdrv_aio_writev    = raw_aio_writev,
1135     .bdrv_aio_flush     = raw_aio_flush,
1136
1137     .bdrv_read          = raw_read,
1138     .bdrv_write         = raw_write,
1139     .bdrv_getlength     = raw_getlength,
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
1162     if (strstart(filename, "/dev/cd", NULL))
1163         prio = 50;
1164
1165     fd = open(filename, O_RDONLY | O_NONBLOCK);
1166     if (fd < 0) {
1167         goto out;
1168     }
1169
1170     /* Attempt to detect via a CDROM specific ioctl */
1171     ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1172     if (ret >= 0)
1173         prio = 100;
1174
1175     close(fd);
1176 out:
1177     return prio;
1178 }
1179
1180 static int cdrom_is_inserted(BlockDriverState *bs)
1181 {
1182     BDRVRawState *s = bs->opaque;
1183     int ret;
1184
1185     ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1186     if (ret == CDS_DISC_OK)
1187         return 1;
1188     return 0;
1189 }
1190
1191 static int cdrom_eject(BlockDriverState *bs, int eject_flag)
1192 {
1193     BDRVRawState *s = bs->opaque;
1194
1195     if (eject_flag) {
1196         if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
1197             perror("CDROMEJECT");
1198     } else {
1199         if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
1200             perror("CDROMEJECT");
1201     }
1202
1203     return 0;
1204 }
1205
1206 static int cdrom_set_locked(BlockDriverState *bs, int locked)
1207 {
1208     BDRVRawState *s = bs->opaque;
1209
1210     if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
1211         /*
1212          * Note: an error can happen if the distribution automatically
1213          * mounts the CD-ROM
1214          */
1215         /* perror("CDROM_LOCKDOOR"); */
1216     }
1217
1218     return 0;
1219 }
1220
1221 static BlockDriver bdrv_host_cdrom = {
1222     .format_name        = "host_cdrom",
1223     .instance_size      = sizeof(BDRVRawState),
1224     .bdrv_probe_device  = cdrom_probe_device,
1225     .bdrv_open          = cdrom_open,
1226     .bdrv_close         = raw_close,
1227     .bdrv_create        = hdev_create,
1228     .create_options     = raw_create_options,
1229     .no_zero_init       = 1,
1230     .bdrv_flush         = raw_flush,
1231
1232     .bdrv_aio_readv     = raw_aio_readv,
1233     .bdrv_aio_writev    = raw_aio_writev,
1234     .bdrv_aio_flush     = raw_aio_flush,
1235
1236     .bdrv_read          = raw_read,
1237     .bdrv_write         = raw_write,
1238     .bdrv_getlength     = raw_getlength,
1239
1240     /* removable device support */
1241     .bdrv_is_inserted   = cdrom_is_inserted,
1242     .bdrv_eject         = cdrom_eject,
1243     .bdrv_set_locked    = cdrom_set_locked,
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 isnt 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         close(s->fd);
1287     fd = 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 isnt 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 int cdrom_eject(BlockDriverState *bs, int eject_flag)
1305 {
1306     BDRVRawState *s = bs->opaque;
1307
1308     if (s->fd < 0)
1309         return -ENOTSUP;
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     if (cdrom_reopen(bs) < 0)
1322         return -ENOTSUP;
1323     return 0;
1324 }
1325
1326 static int cdrom_set_locked(BlockDriverState *bs, int locked)
1327 {
1328     BDRVRawState *s = bs->opaque;
1329
1330     if (s->fd < 0)
1331         return -ENOTSUP;
1332     if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
1333         /*
1334          * Note: an error can happen if the distribution automatically
1335          * mounts the CD-ROM
1336          */
1337         /* perror("CDROM_LOCKDOOR"); */
1338     }
1339
1340     return 0;
1341 }
1342
1343 static BlockDriver bdrv_host_cdrom = {
1344     .format_name        = "host_cdrom",
1345     .instance_size      = sizeof(BDRVRawState),
1346     .bdrv_probe_device  = cdrom_probe_device,
1347     .bdrv_open          = cdrom_open,
1348     .bdrv_close         = raw_close,
1349     .bdrv_create        = hdev_create,
1350     .create_options     = raw_create_options,
1351     .no_zero_init       = 1,
1352     .bdrv_flush         = raw_flush,
1353
1354     .bdrv_aio_readv     = raw_aio_readv,
1355     .bdrv_aio_writev    = raw_aio_writev,
1356     .bdrv_aio_flush     = raw_aio_flush,
1357
1358     .bdrv_read          = raw_read,
1359     .bdrv_write         = raw_write,
1360     .bdrv_getlength     = raw_getlength,
1361
1362     /* removable device support */
1363     .bdrv_is_inserted   = cdrom_is_inserted,
1364     .bdrv_eject         = cdrom_eject,
1365     .bdrv_set_locked    = cdrom_set_locked,
1366 };
1367 #endif /* __FreeBSD__ */
1368
1369 static void bdrv_raw_init(void)
1370 {
1371     /*
1372      * Register all the drivers.  Note that order is important, the driver
1373      * registered last will get probed first.
1374      */
1375     bdrv_register(&bdrv_raw);
1376     bdrv_register(&bdrv_host_device);
1377 #ifdef __linux__
1378     bdrv_register(&bdrv_host_floppy);
1379     bdrv_register(&bdrv_host_cdrom);
1380 #endif
1381 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1382     bdrv_register(&bdrv_host_cdrom);
1383 #endif
1384 }
1385
1386 block_init(bdrv_raw_init);