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 <sys/param.h>
  52 #include <linux/cdrom.h>
  53 #include <linux/fd.h>
  54 #endif
  55 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
  56 #include <signal.h>
  57 #include <sys/disk.h>
  58 #include <sys/cdio.h>
  59 #endif
  60
  61 #ifdef __OpenBSD__
  62 #include <sys/ioctl.h>
  63 #include <sys/disklabel.h>
  64 #include <sys/dkio.h>
  65 #endif
  66
  67 #ifdef __DragonFly__
  68 #include <sys/ioctl.h>
  69 #include <sys/diskslice.h>
  70 #endif
  71
  72 //#define DEBUG_FLOPPY
  73
  74 //#define DEBUG_BLOCK
  75 #if defined(DEBUG_BLOCK)
  76 #define DEBUG_BLOCK_PRINT(formatCstr, ...) do { if (qemu_log_enabled()) \
  77     { qemu_log(formatCstr, ## __VA_ARGS__); qemu_log_flush(); } } while (0)
  78 #else
  79 #define DEBUG_BLOCK_PRINT(formatCstr, ...)
  80 #endif
  81
  82 /* OS X does not have O_DSYNC */
  83 #ifndef O_DSYNC
  84 #ifdef O_SYNC
  85 #define O_DSYNC O_SYNC
  86 #elif defined(O_FSYNC)
  87 #define O_DSYNC O_FSYNC
  88 #endif
  89 #endif
  90
  91 /* Approximate O_DIRECT with O_DSYNC if O_DIRECT isn't available */
  92 #ifndef O_DIRECT
  93 #define O_DIRECT O_DSYNC
  94 #endif
  95
  96 #define FTYPE_FILE   0
  97 #define FTYPE_CD     1
  98 #define FTYPE_FD     2
  99
 100 /* if the FD is not accessed during that time (in ms), we try to
 101    reopen it to see if the disk has been changed */
 102 #define FD_OPEN_TIMEOUT 1000
 103
 104 #define MAX_BLOCKSIZE   4096
 105
 106 typedef struct BDRVRawState {
 107     int fd;
 108     int type;
 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     unsigned aligned_buf_size;
 123 } BDRVRawState;
 124
 125 static int fd_open(BlockDriverState *bs);
 126 static int64_t raw_getlength(BlockDriverState *bs);
 127
 128 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 129 static int cdrom_reopen(BlockDriverState *bs);
 130 #endif
 131
 132 static int raw_open_common(BlockDriverState *bs, const char *filename,
 133                            int bdrv_flags, int open_flags)
 134 {
 135     BDRVRawState *s = bs->opaque;
 136     int fd, ret;
 137
 138     s->open_flags = open_flags | O_BINARY;
 139     s->open_flags &= ~O_ACCMODE;
 140     if (bdrv_flags & BDRV_O_RDWR) {
 141         s->open_flags |= O_RDWR;
 142     } else {
 143         s->open_flags |= O_RDONLY;
 144     }
 145
 146     /* Use O_DSYNC for write-through caching, no flags for write-back caching,
 147      * and O_DIRECT for no caching. */
 148     if ((bdrv_flags & BDRV_O_NOCACHE))
 149         s->open_flags |= O_DIRECT;
 150     else if (!(bdrv_flags & BDRV_O_CACHE_WB))
 151         s->open_flags |= O_DSYNC;
 152
 153     s->fd = -1;
 154     fd = qemu_open(filename, s->open_flags, 0644);
 155     if (fd < 0) {
 156         ret = -errno;
 157         if (ret == -EROFS)
 158             ret = -EACCES;
 159         return ret;
 160     }
 161     s->fd = fd;
 162     s->aligned_buf = NULL;
 163
 164     if ((bdrv_flags & BDRV_O_NOCACHE)) {
 165         /*
 166          * Allocate a buffer for read/modify/write cycles.  Chose the size
 167          * pessimistically as we don't know the block size yet.
 168          */
 169         s->aligned_buf_size = 32 * MAX_BLOCKSIZE;
 170         s->aligned_buf = qemu_memalign(MAX_BLOCKSIZE, s->aligned_buf_size);
 171         if (s->aligned_buf == NULL) {
 172             goto out_close;
 173         }
 174     }
 175
 176 #ifdef CONFIG_LINUX_AIO
 177     if ((bdrv_flags & (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) ==
 178                       (BDRV_O_NOCACHE|BDRV_O_NATIVE_AIO)) {
 179
 180         /* We're falling back to POSIX AIO in some cases */
 181         paio_init();
 182
 183         s->aio_ctx = laio_init();
 184         if (!s->aio_ctx) {
 185             goto out_free_buf;
 186         }
 187         s->use_aio = 1;
 188     } else
 189 #endif
 190     {
 191         if (paio_init() < 0) {
 192             goto out_free_buf;
 193         }
 194 #ifdef CONFIG_LINUX_AIO
 195         s->use_aio = 0;
 196 #endif
 197     }
 198
 199     return 0;
 200
 201 out_free_buf:
 202     qemu_vfree(s->aligned_buf);
 203 out_close:
 204     close(fd);
 205     return -errno;
 206 }
 207
 208 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 209 {
 210     BDRVRawState *s = bs->opaque;
 211
 212     s->type = FTYPE_FILE;
 213     return raw_open_common(bs, filename, flags, 0);
 214 }
 215
 216 /* XXX: use host sector size if necessary with:
 217 #ifdef DIOCGSECTORSIZE
 218         {
 219             unsigned int sectorsize = 512;
 220             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 221                 sectorsize > bufsize)
 222                 bufsize = sectorsize;
 223         }
 224 #endif
 225 #ifdef CONFIG_COCOA
 226         uint32_t blockSize = 512;
 227         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 228             bufsize = blockSize;
 229         }
 230 #endif
 231 */
 232
 233 /*
 234  * offset and count are in bytes, but must be multiples of 512 for files
 235  * opened with O_DIRECT. buf must be aligned to 512 bytes then.
 236  *
 237  * This function may be called without alignment if the caller ensures
 238  * that O_DIRECT is not in effect.
 239  */
 240 static int raw_pread_aligned(BlockDriverState *bs, int64_t offset,
 241                      uint8_t *buf, int count)
 242 {
 243     BDRVRawState *s = bs->opaque;
 244     int ret;
 245
 246     ret = fd_open(bs);
 247     if (ret < 0)
 248         return ret;
 249
 250     ret = pread(s->fd, buf, count, offset);
 251     if (ret == count)
 252         return ret;
 253
 254     /* Allow reads beyond the end (needed for pwrite) */
 255     if ((ret == 0) && bs->growable) {
 256         int64_t size = raw_getlength(bs);
 257         if (offset >= size) {
 258             memset(buf, 0, count);
 259             return count;
 260         }
 261     }
 262
 263     DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 264                       "] read failed %d : %d = %s\n",
 265                       s->fd, bs->filename, offset, buf, count,
 266                       bs->total_sectors, ret, errno, strerror(errno));
 267
 268     /* Try harder for CDrom. */
 269     if (s->type != FTYPE_FILE) {
 270         ret = pread(s->fd, buf, count, offset);
 271         if (ret == count)
 272             return ret;
 273         ret = pread(s->fd, buf, count, offset);
 274         if (ret == count)
 275             return ret;
 276
 277         DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 278                           "] retry read failed %d : %d = %s\n",
 279                           s->fd, bs->filename, offset, buf, count,
 280                           bs->total_sectors, ret, errno, strerror(errno));
 281     }
 282
 283     return  (ret < 0) ? -errno : ret;
 284 }
 285
 286 /*
 287  * offset and count are in bytes, but must be multiples of the sector size
 288  * for files opened with O_DIRECT. buf must be aligned to sector size bytes
 289  * then.
 290  *
 291  * This function may be called without alignment if the caller ensures
 292  * that O_DIRECT is not in effect.
 293  */
 294 static int raw_pwrite_aligned(BlockDriverState *bs, int64_t offset,
 295                       const uint8_t *buf, int count)
 296 {
 297     BDRVRawState *s = bs->opaque;
 298     int ret;
 299
 300     ret = fd_open(bs);
 301     if (ret < 0)
 302         return -errno;
 303
 304     ret = pwrite(s->fd, buf, count, offset);
 305     if (ret == count)
 306         return ret;
 307
 308     DEBUG_BLOCK_PRINT("raw_pwrite(%d:%s, %" PRId64 ", %p, %d) [%" PRId64
 309                       "] write failed %d : %d = %s\n",
 310                       s->fd, bs->filename, offset, buf, count,
 311                       bs->total_sectors, ret, errno, strerror(errno));
 312
 313     return  (ret < 0) ? -errno : ret;
 314 }
 315
 316
 317 /*
 318  * offset and count are in bytes and possibly not aligned. For files opened
 319  * with O_DIRECT, necessary alignments are ensured before calling
 320  * raw_pread_aligned to do the actual read.
 321  */
 322 static int raw_pread(BlockDriverState *bs, int64_t offset,
 323                      uint8_t *buf, int count)
 324 {
 325     BDRVRawState *s = bs->opaque;
 326     unsigned sector_mask = bs->buffer_alignment - 1;
 327     int size, ret, shift, sum;
 328
 329     sum = 0;
 330
 331     if (s->aligned_buf != NULL)  {
 332
 333         if (offset & sector_mask) {
 334             /* align offset on a sector size bytes boundary */
 335
 336             shift = offset & sector_mask;
 337             size = (shift + count + sector_mask) & ~sector_mask;
 338             if (size > s->aligned_buf_size)
 339                 size = s->aligned_buf_size;
 340             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf, size);
 341             if (ret < 0)
 342                 return ret;
 343
 344             size = bs->buffer_alignment - shift;
 345             if (size > count)
 346                 size = count;
 347             memcpy(buf, s->aligned_buf + shift, size);
 348
 349             buf += size;
 350             offset += size;
 351             count -= size;
 352             sum += size;
 353
 354             if (count == 0)
 355                 return sum;
 356         }
 357         if (count & sector_mask || (uintptr_t) buf & sector_mask) {
 358
 359             /* read on aligned buffer */
 360
 361             while (count) {
 362
 363                 size = (count + sector_mask) & ~sector_mask;
 364                 if (size > s->aligned_buf_size)
 365                     size = s->aligned_buf_size;
 366
 367                 ret = raw_pread_aligned(bs, offset, s->aligned_buf, size);
 368                 if (ret < 0) {
 369                     return ret;
 370                 } else if (ret == 0) {
 371                     fprintf(stderr, "raw_pread: read beyond end of file\n");
 372                     abort();
 373                 }
 374
 375                 size = ret;
 376                 if (size > count)
 377                     size = count;
 378
 379                 memcpy(buf, s->aligned_buf, size);
 380
 381                 buf += size;
 382                 offset += size;
 383                 count -= size;
 384                 sum += size;
 385             }
 386
 387             return sum;
 388         }
 389     }
 390
 391     return raw_pread_aligned(bs, offset, buf, count) + sum;
 392 }
 393
 394 static int raw_read(BlockDriverState *bs, int64_t sector_num,
 395                     uint8_t *buf, int nb_sectors)
 396 {
 397     int ret;
 398
 399     ret = raw_pread(bs, sector_num * BDRV_SECTOR_SIZE, buf,
 400                     nb_sectors * BDRV_SECTOR_SIZE);
 401     if (ret == (nb_sectors * BDRV_SECTOR_SIZE))
 402         ret = 0;
 403     return ret;
 404 }
 405
 406 /*
 407  * offset and count are in bytes and possibly not aligned. For files opened
 408  * with O_DIRECT, necessary alignments are ensured before calling
 409  * raw_pwrite_aligned to do the actual write.
 410  */
 411 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 412                       const uint8_t *buf, int count)
 413 {
 414     BDRVRawState *s = bs->opaque;
 415     unsigned sector_mask = bs->buffer_alignment - 1;
 416     int size, ret, shift, sum;
 417
 418     sum = 0;
 419
 420     if (s->aligned_buf != NULL) {
 421
 422         if (offset & sector_mask) {
 423             /* align offset on a sector size bytes boundary */
 424             shift = offset & sector_mask;
 425             ret = raw_pread_aligned(bs, offset - shift, s->aligned_buf,
 426                                     bs->buffer_alignment);
 427             if (ret < 0)
 428                 return ret;
 429
 430             size = bs->buffer_alignment - shift;
 431             if (size > count)
 432                 size = count;
 433             memcpy(s->aligned_buf + shift, buf, size);
 434
 435             ret = raw_pwrite_aligned(bs, offset - shift, s->aligned_buf,
 436                                      bs->buffer_alignment);
 437             if (ret < 0)
 438                 return ret;
 439
 440             buf += size;
 441             offset += size;
 442             count -= size;
 443             sum += size;
 444
 445             if (count == 0)
 446                 return sum;
 447         }
 448         if (count & sector_mask || (uintptr_t) buf & sector_mask) {
 449
 450             while ((size = (count & ~sector_mask)) != 0) {
 451
 452                 if (size > s->aligned_buf_size)
 453                     size = s->aligned_buf_size;
 454
 455                 memcpy(s->aligned_buf, buf, size);
 456
 457                 ret = raw_pwrite_aligned(bs, offset, s->aligned_buf, size);
 458                 if (ret < 0)
 459                     return ret;
 460
 461                 buf += ret;
 462                 offset += ret;
 463                 count -= ret;
 464                 sum += ret;
 465             }
 466             /* here, count < 512 because (count & ~sector_mask) == 0 */
 467             if (count) {
 468                 ret = raw_pread_aligned(bs, offset, s->aligned_buf,
 469                                      bs->buffer_alignment);
 470                 if (ret < 0)
 471                     return ret;
 472                  memcpy(s->aligned_buf, buf, count);
 473
 474                  ret = raw_pwrite_aligned(bs, offset, s->aligned_buf,
 475                                      bs->buffer_alignment);
 476                  if (ret < 0)
 477                      return ret;
 478                  if (count < ret)
 479                      ret = count;
 480
 481                  sum += ret;
 482             }
 483             return sum;
 484         }
 485     }
 486     return raw_pwrite_aligned(bs, offset, buf, count) + sum;
 487 }
 488
 489 static int raw_write(BlockDriverState *bs, int64_t sector_num,
 490                      const uint8_t *buf, int nb_sectors)
 491 {
 492     int ret;
 493     ret = raw_pwrite(bs, sector_num * BDRV_SECTOR_SIZE, buf,
 494                      nb_sectors * BDRV_SECTOR_SIZE);
 495     if (ret == (nb_sectors * BDRV_SECTOR_SIZE))
 496         ret = 0;
 497     return ret;
 498 }
 499
 500 /*
 501  * Check if all memory in this vector is sector aligned.
 502  */
 503 static int qiov_is_aligned(BlockDriverState *bs, QEMUIOVector *qiov)
 504 {
 505     int i;
 506
 507     for (i = 0; i < qiov->niov; i++) {
 508         if ((uintptr_t) qiov->iov[i].iov_base % bs->buffer_alignment) {
 509             return 0;
 510         }
 511     }
 512
 513     return 1;
 514 }
 515
 516 static BlockDriverAIOCB *raw_aio_submit(BlockDriverState *bs,
 517         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 518         BlockDriverCompletionFunc *cb, void *opaque, int type)
 519 {
 520     BDRVRawState *s = bs->opaque;
 521
 522     if (fd_open(bs) < 0)
 523         return NULL;
 524
 525     /*
 526      * If O_DIRECT is used the buffer needs to be aligned on a sector
 527      * boundary.  Check if this is the case or telll the low-level
 528      * driver that it needs to copy the buffer.
 529      */
 530     if (s->aligned_buf) {
 531         if (!qiov_is_aligned(bs, qiov)) {
 532             type |= QEMU_AIO_MISALIGNED;
 533 #ifdef CONFIG_LINUX_AIO
 534         } else if (s->use_aio) {
 535             return laio_submit(bs, s->aio_ctx, s->fd, sector_num, qiov,
 536                                nb_sectors, cb, opaque, type);
 537 #endif
 538         }
 539     }
 540
 541     return paio_submit(bs, s->fd, sector_num, qiov, nb_sectors,
 542                        cb, opaque, type);
 543 }
 544
 545 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
 546         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 547         BlockDriverCompletionFunc *cb, void *opaque)
 548 {
 549     return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
 550                           cb, opaque, QEMU_AIO_READ);
 551 }
 552
 553 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
 554         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 555         BlockDriverCompletionFunc *cb, void *opaque)
 556 {
 557     return raw_aio_submit(bs, sector_num, qiov, nb_sectors,
 558                           cb, opaque, QEMU_AIO_WRITE);
 559 }
 560
 561 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
 562         BlockDriverCompletionFunc *cb, void *opaque)
 563 {
 564     BDRVRawState *s = bs->opaque;
 565
 566     if (fd_open(bs) < 0)
 567         return NULL;
 568
 569     return paio_submit(bs, s->fd, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 570 }
 571
 572 static void raw_close(BlockDriverState *bs)
 573 {
 574     BDRVRawState *s = bs->opaque;
 575     if (s->fd >= 0) {
 576         close(s->fd);
 577         s->fd = -1;
 578         if (s->aligned_buf != NULL)
 579             qemu_vfree(s->aligned_buf);
 580     }
 581 }
 582
 583 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 584 {
 585     BDRVRawState *s = bs->opaque;
 586     if (s->type != FTYPE_FILE)
 587         return -ENOTSUP;
 588     if (ftruncate(s->fd, offset) < 0)
 589         return -errno;
 590     return 0;
 591 }
 592
 593 #ifdef __OpenBSD__
 594 static int64_t raw_getlength(BlockDriverState *bs)
 595 {
 596     BDRVRawState *s = bs->opaque;
 597     int fd = s->fd;
 598     struct stat st;
 599
 600     if (fstat(fd, &st))
 601         return -1;
 602     if (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode)) {
 603         struct disklabel dl;
 604
 605         if (ioctl(fd, DIOCGDINFO, &dl))
 606             return -1;
 607         return (uint64_t)dl.d_secsize *
 608             dl.d_partitions[DISKPART(st.st_rdev)].p_size;
 609     } else
 610         return st.st_size;
 611 }
 612 #elif defined(__sun__)
 613 static int64_t raw_getlength(BlockDriverState *bs)
 614 {
 615     BDRVRawState *s = bs->opaque;
 616     struct dk_minfo minfo;
 617     int ret;
 618
 619     ret = fd_open(bs);
 620     if (ret < 0) {
 621         return ret;
 622     }
 623
 624     /*
 625      * Use the DKIOCGMEDIAINFO ioctl to read the size.
 626      */
 627     ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
 628     if (ret != -1) {
 629         return minfo.dki_lbsize * minfo.dki_capacity;
 630     }
 631
 632     /*
 633      * There are reports that lseek on some devices fails, but
 634      * irc discussion said that contingency on contingency was overkill.
 635      */
 636     return lseek(s->fd, 0, SEEK_END);
 637 }
 638 #elif defined(CONFIG_BSD)
 639 static int64_t raw_getlength(BlockDriverState *bs)
 640 {
 641     BDRVRawState *s = bs->opaque;
 642     int fd = s->fd;
 643     int64_t size;
 644     struct stat sb;
 645 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 646     int reopened = 0;
 647 #endif
 648     int ret;
 649
 650     ret = fd_open(bs);
 651     if (ret < 0)
 652         return ret;
 653
 654 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 655 again:
 656 #endif
 657     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 658 #ifdef DIOCGMEDIASIZE
 659         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 660 #elif defined(DIOCGPART)
 661         {
 662                 struct partinfo pi;
 663                 if (ioctl(fd, DIOCGPART, &pi) == 0)
 664                         size = pi.media_size;
 665                 else
 666                         size = 0;
 667         }
 668         if (size == 0)
 669 #endif
 670 #ifdef CONFIG_COCOA
 671         size = LONG_LONG_MAX;
 672 #else
 673         size = lseek(fd, 0LL, SEEK_END);
 674 #endif
 675 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 676         switch(s->type) {
 677         case FTYPE_CD:
 678             /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
 679             if (size == 2048LL * (unsigned)-1)
 680                 size = 0;
 681             /* XXX no disc?  maybe we need to reopen... */
 682             if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
 683                 reopened = 1;
 684                 goto again;
 685             }
 686         }
 687 #endif
 688     } else {
 689         size = lseek(fd, 0, SEEK_END);
 690     }
 691     return size;
 692 }
 693 #else
 694 static int64_t raw_getlength(BlockDriverState *bs)
 695 {
 696     BDRVRawState *s = bs->opaque;
 697     int ret;
 698
 699     ret = fd_open(bs);
 700     if (ret < 0) {
 701         return ret;
 702     }
 703
 704     return lseek(s->fd, 0, SEEK_END);
 705 }
 706 #endif
 707
 708 static int raw_create(const char *filename, QEMUOptionParameter *options)
 709 {
 710     int fd;
 711     int result = 0;
 712     int64_t total_size = 0;
 713
 714     /* Read out options */
 715     while (options && options->name) {
 716         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 717             total_size = options->value.n / BDRV_SECTOR_SIZE;
 718         }
 719         options++;
 720     }
 721
 722     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 723               0644);
 724     if (fd < 0) {
 725         result = -errno;
 726     } else {
 727         if (ftruncate(fd, total_size * BDRV_SECTOR_SIZE) != 0) {
 728             result = -errno;
 729         }
 730         if (close(fd) != 0) {
 731             result = -errno;
 732         }
 733     }
 734     return result;
 735 }
 736
 737 static void raw_flush(BlockDriverState *bs)
 738 {
 739     BDRVRawState *s = bs->opaque;
 740     qemu_fdatasync(s->fd);
 741 }
 742
 743
 744 static QEMUOptionParameter raw_create_options[] = {
 745     {
 746         .name = BLOCK_OPT_SIZE,
 747         .type = OPT_SIZE,
 748         .help = "Virtual disk size"
 749     },
 750     { NULL }
 751 };
 752
 753 static BlockDriver bdrv_file = {
 754     .format_name = "file",
 755     .protocol_name = "file",
 756     .instance_size = sizeof(BDRVRawState),
 757     .bdrv_probe = NULL, /* no probe for protocols */
 758     .bdrv_file_open = raw_open,
 759     .bdrv_read = raw_read,
 760     .bdrv_write = raw_write,
 761     .bdrv_close = raw_close,
 762     .bdrv_create = raw_create,
 763     .bdrv_flush = raw_flush,
 764
 765     .bdrv_aio_readv = raw_aio_readv,
 766     .bdrv_aio_writev = raw_aio_writev,
 767     .bdrv_aio_flush = raw_aio_flush,
 768
 769     .bdrv_truncate = raw_truncate,
 770     .bdrv_getlength = raw_getlength,
 771
 772     .create_options = raw_create_options,
 773 };
 774
 775 /***********************************************/
 776 /* host device */
 777
 778 #ifdef CONFIG_COCOA
 779 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 780 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 781
 782 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 783 {
 784     kern_return_t       kernResult;
 785     mach_port_t     masterPort;
 786     CFMutableDictionaryRef  classesToMatch;
 787
 788     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 789     if ( KERN_SUCCESS != kernResult ) {
 790         printf( "IOMasterPort returned %d\n", kernResult );
 791     }
 792
 793     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 794     if ( classesToMatch == NULL ) {
 795         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 796     } else {
 797     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 798     }
 799     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 800     if ( KERN_SUCCESS != kernResult )
 801     {
 802         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 803     }
 804
 805     return kernResult;
 806 }
 807
 808 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 809 {
 810     io_object_t     nextMedia;
 811     kern_return_t   kernResult = KERN_FAILURE;
 812     *bsdPath = '\0';
 813     nextMedia = IOIteratorNext( mediaIterator );
 814     if ( nextMedia )
 815     {
 816         CFTypeRef   bsdPathAsCFString;
 817     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 818         if ( bsdPathAsCFString ) {
 819             size_t devPathLength;
 820             strcpy( bsdPath, _PATH_DEV );
 821             strcat( bsdPath, "r" );
 822             devPathLength = strlen( bsdPath );
 823             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 824                 kernResult = KERN_SUCCESS;
 825             }
 826             CFRelease( bsdPathAsCFString );
 827         }
 828         IOObjectRelease( nextMedia );
 829     }
 830
 831     return kernResult;
 832 }
 833
 834 #endif
 835
 836 static int hdev_probe_device(const char *filename)
 837 {
 838     struct stat st;
 839
 840     /* allow a dedicated CD-ROM driver to match with a higher priority */
 841     if (strstart(filename, "/dev/cdrom", NULL))
 842         return 50;
 843
 844     if (stat(filename, &st) >= 0 &&
 845             (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
 846         return 100;
 847     }
 848
 849     return 0;
 850 }
 851
 852 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 853 {
 854     BDRVRawState *s = bs->opaque;
 855
 856 #ifdef CONFIG_COCOA
 857     if (strstart(filename, "/dev/cdrom", NULL)) {
 858         kern_return_t kernResult;
 859         io_iterator_t mediaIterator;
 860         char bsdPath[ MAXPATHLEN ];
 861         int fd;
 862
 863         kernResult = FindEjectableCDMedia( &mediaIterator );
 864         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 865
 866         if ( bsdPath[ 0 ] != '\0' ) {
 867             strcat(bsdPath,"s0");
 868             /* some CDs don't have a partition 0 */
 869             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 870             if (fd < 0) {
 871                 bsdPath[strlen(bsdPath)-1] = '1';
 872             } else {
 873                 close(fd);
 874             }
 875             filename = bsdPath;
 876         }
 877
 878         if ( mediaIterator )
 879             IOObjectRelease( mediaIterator );
 880     }
 881 #endif
 882
 883     s->type = FTYPE_FILE;
 884 #if defined(__linux__)
 885     {
 886         char resolved_path[ MAXPATHLEN ], *temp;
 887
 888         temp = realpath(filename, resolved_path);
 889         if (temp && strstart(temp, "/dev/sg", NULL)) {
 890             bs->sg = 1;
 891         }
 892     }
 893 #endif
 894
 895     return raw_open_common(bs, filename, flags, 0);
 896 }
 897
 898 #if defined(__linux__)
 899 /* Note: we do not have a reliable method to detect if the floppy is
 900    present. The current method is to try to open the floppy at every
 901    I/O and to keep it opened during a few hundreds of ms. */
 902 static int fd_open(BlockDriverState *bs)
 903 {
 904     BDRVRawState *s = bs->opaque;
 905     int last_media_present;
 906
 907     if (s->type != FTYPE_FD)
 908         return 0;
 909     last_media_present = (s->fd >= 0);
 910     if (s->fd >= 0 &&
 911         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
 912         close(s->fd);
 913         s->fd = -1;
 914 #ifdef DEBUG_FLOPPY
 915         printf("Floppy closed\n");
 916 #endif
 917     }
 918     if (s->fd < 0) {
 919         if (s->fd_got_error &&
 920             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
 921 #ifdef DEBUG_FLOPPY
 922             printf("No floppy (open delayed)\n");
 923 #endif
 924             return -EIO;
 925         }
 926         s->fd = open(bs->filename, s->open_flags & ~O_NONBLOCK);
 927         if (s->fd < 0) {
 928             s->fd_error_time = qemu_get_clock(rt_clock);
 929             s->fd_got_error = 1;
 930             if (last_media_present)
 931                 s->fd_media_changed = 1;
 932 #ifdef DEBUG_FLOPPY
 933             printf("No floppy\n");
 934 #endif
 935             return -EIO;
 936         }
 937 #ifdef DEBUG_FLOPPY
 938         printf("Floppy opened\n");
 939 #endif
 940     }
 941     if (!last_media_present)
 942         s->fd_media_changed = 1;
 943     s->fd_open_time = qemu_get_clock(rt_clock);
 944     s->fd_got_error = 0;
 945     return 0;
 946 }
 947
 948 static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 949 {
 950     BDRVRawState *s = bs->opaque;
 951
 952     return ioctl(s->fd, req, buf);
 953 }
 954
 955 static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
 956         unsigned long int req, void *buf,
 957         BlockDriverCompletionFunc *cb, void *opaque)
 958 {
 959     BDRVRawState *s = bs->opaque;
 960
 961     if (fd_open(bs) < 0)
 962         return NULL;
 963     return paio_ioctl(bs, s->fd, req, buf, cb, opaque);
 964 }
 965
 966 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 967 static int fd_open(BlockDriverState *bs)
 968 {
 969     BDRVRawState *s = bs->opaque;
 970
 971     /* this is just to ensure s->fd is sane (its called by io ops) */
 972     if (s->fd >= 0)
 973         return 0;
 974     return -EIO;
 975 }
 976 #else /* !linux && !FreeBSD */
 977
 978 static int fd_open(BlockDriverState *bs)
 979 {
 980     return 0;
 981 }
 982
 983 #endif /* !linux && !FreeBSD */
 984
 985 static int hdev_create(const char *filename, QEMUOptionParameter *options)
 986 {
 987     int fd;
 988     int ret = 0;
 989     struct stat stat_buf;
 990     int64_t total_size = 0;
 991
 992     /* Read out options */
 993     while (options && options->name) {
 994         if (!strcmp(options->name, "size")) {
 995             total_size = options->value.n / BDRV_SECTOR_SIZE;
 996         }
 997         options++;
 998     }
 999
1000     fd = open(filename, O_WRONLY | O_BINARY);
1001     if (fd < 0)
1002         return -errno;
1003
1004     if (fstat(fd, &stat_buf) < 0)
1005         ret = -errno;
1006     else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
1007         ret = -ENODEV;
1008     else if (lseek(fd, 0, SEEK_END) < total_size * BDRV_SECTOR_SIZE)
1009         ret = -ENOSPC;
1010
1011     close(fd);
1012     return ret;
1013 }
1014
1015 static int hdev_has_zero_init(BlockDriverState *bs)
1016 {
1017     return 0;
1018 }
1019
1020 static BlockDriver bdrv_host_device = {
1021     .format_name        = "host_device",
1022     .protocol_name        = "host_device",
1023     .instance_size      = sizeof(BDRVRawState),
1024     .bdrv_probe_device  = hdev_probe_device,
1025     .bdrv_file_open     = hdev_open,
1026     .bdrv_close         = raw_close,
1027     .bdrv_create        = hdev_create,
1028     .create_options     = raw_create_options,
1029     .bdrv_has_zero_init = hdev_has_zero_init,
1030     .bdrv_flush         = raw_flush,
1031
1032     .bdrv_aio_readv     = raw_aio_readv,
1033     .bdrv_aio_writev    = raw_aio_writev,
1034     .bdrv_aio_flush     = raw_aio_flush,
1035
1036     .bdrv_read          = raw_read,
1037     .bdrv_write         = raw_write,
1038     .bdrv_getlength     = raw_getlength,
1039
1040     /* generic scsi device */
1041 #ifdef __linux__
1042     .bdrv_ioctl         = hdev_ioctl,
1043     .bdrv_aio_ioctl     = hdev_aio_ioctl,
1044 #endif
1045 };
1046
1047 #ifdef __linux__
1048 static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
1049 {
1050     BDRVRawState *s = bs->opaque;
1051     int ret;
1052
1053     s->type = FTYPE_FD;
1054
1055     /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
1056     ret = raw_open_common(bs, filename, flags, O_NONBLOCK);
1057     if (ret)
1058         return ret;
1059
1060     /* close fd so that we can reopen it as needed */
1061     close(s->fd);
1062     s->fd = -1;
1063     s->fd_media_changed = 1;
1064
1065     return 0;
1066 }
1067
1068 static int floppy_probe_device(const char *filename)
1069 {
1070     int fd, ret;
1071     int prio = 0;
1072     struct floppy_struct fdparam;
1073
1074     if (strstart(filename, "/dev/fd", NULL))
1075         prio = 50;
1076
1077     fd = open(filename, O_RDONLY | O_NONBLOCK);
1078     if (fd < 0) {
1079         goto out;
1080     }
1081
1082     /* Attempt to detect via a floppy specific ioctl */
1083     ret = ioctl(fd, FDGETPRM, &fdparam);
1084     if (ret >= 0)
1085         prio = 100;
1086
1087     close(fd);
1088 out:
1089     return prio;
1090 }
1091
1092
1093 static int floppy_is_inserted(BlockDriverState *bs)
1094 {
1095     return fd_open(bs) >= 0;
1096 }
1097
1098 static int floppy_media_changed(BlockDriverState *bs)
1099 {
1100     BDRVRawState *s = bs->opaque;
1101     int ret;
1102
1103     /*
1104      * XXX: we do not have a true media changed indication.
1105      * It does not work if the floppy is changed without trying to read it.
1106      */
1107     fd_open(bs);
1108     ret = s->fd_media_changed;
1109     s->fd_media_changed = 0;
1110 #ifdef DEBUG_FLOPPY
1111     printf("Floppy changed=%d\n", ret);
1112 #endif
1113     return ret;
1114 }
1115
1116 static int floppy_eject(BlockDriverState *bs, int eject_flag)
1117 {
1118     BDRVRawState *s = bs->opaque;
1119     int fd;
1120
1121     if (s->fd >= 0) {
1122         close(s->fd);
1123         s->fd = -1;
1124     }
1125     fd = open(bs->filename, s->open_flags | O_NONBLOCK);
1126     if (fd >= 0) {
1127         if (ioctl(fd, FDEJECT, 0) < 0)
1128             perror("FDEJECT");
1129         close(fd);
1130     }
1131
1132     return 0;
1133 }
1134
1135 static BlockDriver bdrv_host_floppy = {
1136     .format_name        = "host_floppy",
1137     .protocol_name      = "host_floppy",
1138     .instance_size      = sizeof(BDRVRawState),
1139     .bdrv_probe_device  = floppy_probe_device,
1140     .bdrv_file_open     = floppy_open,
1141     .bdrv_close         = raw_close,
1142     .bdrv_create        = hdev_create,
1143     .create_options     = raw_create_options,
1144     .bdrv_has_zero_init = hdev_has_zero_init,
1145     .bdrv_flush         = raw_flush,
1146
1147     .bdrv_aio_readv     = raw_aio_readv,
1148     .bdrv_aio_writev    = raw_aio_writev,
1149     .bdrv_aio_flush     = raw_aio_flush,
1150
1151     .bdrv_read          = raw_read,
1152     .bdrv_write         = raw_write,
1153     .bdrv_getlength     = raw_getlength,
1154
1155     /* removable device support */
1156     .bdrv_is_inserted   = floppy_is_inserted,
1157     .bdrv_media_changed = floppy_media_changed,
1158     .bdrv_eject         = floppy_eject,
1159 };
1160
1161 static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
1162 {
1163     BDRVRawState *s = bs->opaque;
1164
1165     s->type = FTYPE_CD;
1166
1167     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
1168     return raw_open_common(bs, filename, flags, O_NONBLOCK);
1169 }
1170
1171 static int cdrom_probe_device(const char *filename)
1172 {
1173     int fd, ret;
1174     int prio = 0;
1175
1176     fd = open(filename, O_RDONLY | O_NONBLOCK);
1177     if (fd < 0) {
1178         goto out;
1179     }
1180
1181     /* Attempt to detect via a CDROM specific ioctl */
1182     ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1183     if (ret >= 0)
1184         prio = 100;
1185
1186     close(fd);
1187 out:
1188     return prio;
1189 }
1190
1191 static int cdrom_is_inserted(BlockDriverState *bs)
1192 {
1193     BDRVRawState *s = bs->opaque;
1194     int ret;
1195
1196     ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1197     if (ret == CDS_DISC_OK)
1198         return 1;
1199     return 0;
1200 }
1201
1202 static int cdrom_eject(BlockDriverState *bs, int eject_flag)
1203 {
1204     BDRVRawState *s = bs->opaque;
1205
1206     if (eject_flag) {
1207         if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
1208             perror("CDROMEJECT");
1209     } else {
1210         if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
1211             perror("CDROMEJECT");
1212     }
1213
1214     return 0;
1215 }
1216
1217 static int cdrom_set_locked(BlockDriverState *bs, int locked)
1218 {
1219     BDRVRawState *s = bs->opaque;
1220
1221     if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
1222         /*
1223          * Note: an error can happen if the distribution automatically
1224          * mounts the CD-ROM
1225          */
1226         /* perror("CDROM_LOCKDOOR"); */
1227     }
1228
1229     return 0;
1230 }
1231
1232 static BlockDriver bdrv_host_cdrom = {
1233     .format_name        = "host_cdrom",
1234     .protocol_name      = "host_cdrom",
1235     .instance_size      = sizeof(BDRVRawState),
1236     .bdrv_probe_device  = cdrom_probe_device,
1237     .bdrv_file_open     = cdrom_open,
1238     .bdrv_close         = raw_close,
1239     .bdrv_create        = hdev_create,
1240     .create_options     = raw_create_options,
1241     .bdrv_has_zero_init = hdev_has_zero_init,
1242     .bdrv_flush         = raw_flush,
1243
1244     .bdrv_aio_readv     = raw_aio_readv,
1245     .bdrv_aio_writev    = raw_aio_writev,
1246     .bdrv_aio_flush     = raw_aio_flush,
1247
1248     .bdrv_read          = raw_read,
1249     .bdrv_write         = raw_write,
1250     .bdrv_getlength     = raw_getlength,
1251
1252     /* removable device support */
1253     .bdrv_is_inserted   = cdrom_is_inserted,
1254     .bdrv_eject         = cdrom_eject,
1255     .bdrv_set_locked    = cdrom_set_locked,
1256
1257     /* generic scsi device */
1258     .bdrv_ioctl         = hdev_ioctl,
1259     .bdrv_aio_ioctl     = hdev_aio_ioctl,
1260 };
1261 #endif /* __linux__ */
1262
1263 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1264 static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
1265 {
1266     BDRVRawState *s = bs->opaque;
1267     int ret;
1268
1269     s->type = FTYPE_CD;
1270
1271     ret = raw_open_common(bs, filename, flags, 0);
1272     if (ret)
1273         return ret;
1274
1275     /* make sure the door isnt locked at this time */
1276     ioctl(s->fd, CDIOCALLOW);
1277     return 0;
1278 }
1279
1280 static int cdrom_probe_device(const char *filename)
1281 {
1282     if (strstart(filename, "/dev/cd", NULL) ||
1283             strstart(filename, "/dev/acd", NULL))
1284         return 100;
1285     return 0;
1286 }
1287
1288 static int cdrom_reopen(BlockDriverState *bs)
1289 {
1290     BDRVRawState *s = bs->opaque;
1291     int fd;
1292
1293     /*
1294      * Force reread of possibly changed/newly loaded disc,
1295      * FreeBSD seems to not notice sometimes...
1296      */
1297     if (s->fd >= 0)
1298         close(s->fd);
1299     fd = open(bs->filename, s->open_flags, 0644);
1300     if (fd < 0) {
1301         s->fd = -1;
1302         return -EIO;
1303     }
1304     s->fd = fd;
1305
1306     /* make sure the door isnt locked at this time */
1307     ioctl(s->fd, CDIOCALLOW);
1308     return 0;
1309 }
1310
1311 static int cdrom_is_inserted(BlockDriverState *bs)
1312 {
1313     return raw_getlength(bs) > 0;
1314 }
1315
1316 static int cdrom_eject(BlockDriverState *bs, int eject_flag)
1317 {
1318     BDRVRawState *s = bs->opaque;
1319
1320     if (s->fd < 0)
1321         return -ENOTSUP;
1322
1323     (void) ioctl(s->fd, CDIOCALLOW);
1324
1325     if (eject_flag) {
1326         if (ioctl(s->fd, CDIOCEJECT) < 0)
1327             perror("CDIOCEJECT");
1328     } else {
1329         if (ioctl(s->fd, CDIOCCLOSE) < 0)
1330             perror("CDIOCCLOSE");
1331     }
1332
1333     if (cdrom_reopen(bs) < 0)
1334         return -ENOTSUP;
1335     return 0;
1336 }
1337
1338 static int cdrom_set_locked(BlockDriverState *bs, int locked)
1339 {
1340     BDRVRawState *s = bs->opaque;
1341
1342     if (s->fd < 0)
1343         return -ENOTSUP;
1344     if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
1345         /*
1346          * Note: an error can happen if the distribution automatically
1347          * mounts the CD-ROM
1348          */
1349         /* perror("CDROM_LOCKDOOR"); */
1350     }
1351
1352     return 0;
1353 }
1354
1355 static BlockDriver bdrv_host_cdrom = {
1356     .format_name        = "host_cdrom",
1357     .protocol_name      = "host_cdrom",
1358     .instance_size      = sizeof(BDRVRawState),
1359     .bdrv_probe_device  = cdrom_probe_device,
1360     .bdrv_file_open     = cdrom_open,
1361     .bdrv_close         = raw_close,
1362     .bdrv_create        = hdev_create,
1363     .create_options     = raw_create_options,
1364     .bdrv_has_zero_init = hdev_has_zero_init,
1365     .bdrv_flush         = raw_flush,
1366
1367     .bdrv_aio_readv     = raw_aio_readv,
1368     .bdrv_aio_writev    = raw_aio_writev,
1369     .bdrv_aio_flush     = raw_aio_flush,
1370
1371     .bdrv_read          = raw_read,
1372     .bdrv_write         = raw_write,
1373     .bdrv_getlength     = raw_getlength,
1374
1375     /* removable device support */
1376     .bdrv_is_inserted   = cdrom_is_inserted,
1377     .bdrv_eject         = cdrom_eject,
1378     .bdrv_set_locked    = cdrom_set_locked,
1379 };
1380 #endif /* __FreeBSD__ */
1381
1382 static void bdrv_file_init(void)
1383 {
1384     /*
1385      * Register all the drivers.  Note that order is important, the driver
1386      * registered last will get probed first.
1387      */
1388     bdrv_register(&bdrv_file);
1389     bdrv_register(&bdrv_host_device);
1390 #ifdef __linux__
1391     bdrv_register(&bdrv_host_floppy);
1392     bdrv_register(&bdrv_host_cdrom);
1393 #endif
1394 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1395     bdrv_register(&bdrv_host_cdrom);
1396 #endif
1397 }
1398
1399 block_init(bdrv_file_init);