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 #elif defined(__sun__)
 631 static int64_t raw_getlength(BlockDriverState *bs)
 632 {
 633     BDRVRawState *s = bs->opaque;
 634     struct dk_minfo minfo;
 635     int ret;
 636
 637     ret = fd_open(bs);
 638     if (ret < 0) {
 639         return ret;
 640     }
 641
 642     /*
 643      * Use the DKIOCGMEDIAINFO ioctl to read the size.
 644      */
 645     ret = ioctl(s->fd, DKIOCGMEDIAINFO, &minfo);
 646     if (ret != -1) {
 647         return minfo.dki_lbsize * minfo.dki_capacity;
 648     }
 649
 650     /*
 651      * There are reports that lseek on some devices fails, but
 652      * irc discussion said that contingency on contingency was overkill.
 653      */
 654     return lseek(s->fd, 0, SEEK_END);
 655 }
 656 #elif defined(CONFIG_BSD)
 657 static int64_t raw_getlength(BlockDriverState *bs)
 658 {
 659     BDRVRawState *s = bs->opaque;
 660     int fd = s->fd;
 661     int64_t size;
 662     struct stat sb;
 663 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 664     int reopened = 0;
 665 #endif
 666     int ret;
 667
 668     ret = fd_open(bs);
 669     if (ret < 0)
 670         return ret;
 671
 672 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
 673 again:
 674 #endif
 675     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 676 #ifdef DIOCGMEDIASIZE
 677         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 678 #elif defined(DIOCGPART)
 679         {
 680                 struct partinfo pi;
 681                 if (ioctl(fd, DIOCGPART, &pi) == 0)
 682                         size = pi.media_size;
 683                 else
 684                         size = 0;
 685         }
 686         if (size == 0)
 687 #endif
 688 #ifdef CONFIG_COCOA
 689         size = LONG_LONG_MAX;
 690 #else
 691         size = lseek(fd, 0LL, SEEK_END);
 692 #endif
 693 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 694         switch(s->type) {
 695         case FTYPE_CD:
 696             /* XXX FreeBSD acd returns UINT_MAX sectors for an empty drive */
 697             if (size == 2048LL * (unsigned)-1)
 698                 size = 0;
 699             /* XXX no disc?  maybe we need to reopen... */
 700             if (size <= 0 && !reopened && cdrom_reopen(bs) >= 0) {
 701                 reopened = 1;
 702                 goto again;
 703             }
 704         }
 705 #endif
 706     } else {
 707         size = lseek(fd, 0, SEEK_END);
 708     }
 709     return size;
 710 }
 711 #else
 712 static int64_t raw_getlength(BlockDriverState *bs)
 713 {
 714     BDRVRawState *s = bs->opaque;
 715     int ret;
 716
 717     ret = fd_open(bs);
 718     if (ret < 0) {
 719         return ret;
 720     }
 721
 722     return lseek(s->fd, 0, SEEK_END);
 723 }
 724 #endif
 725
 726 static int raw_create(const char *filename, QEMUOptionParameter *options)
 727 {
 728     int fd;
 729     int result = 0;
 730     int64_t total_size = 0;
 731
 732     /* Read out options */
 733     while (options && options->name) {
 734         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 735             total_size = options->value.n / 512;
 736         }
 737         options++;
 738     }
 739
 740     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 741               0644);
 742     if (fd < 0) {
 743         result = -errno;
 744     } else {
 745         if (ftruncate(fd, total_size * 512) != 0) {
 746             result = -errno;
 747         }
 748         if (close(fd) != 0) {
 749             result = -errno;
 750         }
 751     }
 752     return result;
 753 }
 754
 755 static void raw_flush(BlockDriverState *bs)
 756 {
 757     BDRVRawState *s = bs->opaque;
 758     qemu_fdatasync(s->fd);
 759 }
 760
 761
 762 static QEMUOptionParameter raw_create_options[] = {
 763     {
 764         .name = BLOCK_OPT_SIZE,
 765         .type = OPT_SIZE,
 766         .help = "Virtual disk size"
 767     },
 768     { NULL }
 769 };
 770
 771 static BlockDriver bdrv_file = {
 772     .format_name = "file",
 773     .protocol_name = "file",
 774     .instance_size = sizeof(BDRVRawState),
 775     .bdrv_probe = NULL, /* no probe for protocols */
 776     .bdrv_file_open = raw_open,
 777     .bdrv_read = raw_read,
 778     .bdrv_write = raw_write,
 779     .bdrv_close = raw_close,
 780     .bdrv_create = raw_create,
 781     .bdrv_flush = raw_flush,
 782
 783     .bdrv_aio_readv = raw_aio_readv,
 784     .bdrv_aio_writev = raw_aio_writev,
 785     .bdrv_aio_flush = raw_aio_flush,
 786
 787     .bdrv_truncate = raw_truncate,
 788     .bdrv_getlength = raw_getlength,
 789
 790     .create_options = raw_create_options,
 791 };
 792
 793 /***********************************************/
 794 /* host device */
 795
 796 #ifdef CONFIG_COCOA
 797 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 798 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 799
 800 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 801 {
 802     kern_return_t       kernResult;
 803     mach_port_t     masterPort;
 804     CFMutableDictionaryRef  classesToMatch;
 805
 806     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 807     if ( KERN_SUCCESS != kernResult ) {
 808         printf( "IOMasterPort returned %d\n", kernResult );
 809     }
 810
 811     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 812     if ( classesToMatch == NULL ) {
 813         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 814     } else {
 815     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 816     }
 817     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 818     if ( KERN_SUCCESS != kernResult )
 819     {
 820         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 821     }
 822
 823     return kernResult;
 824 }
 825
 826 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 827 {
 828     io_object_t     nextMedia;
 829     kern_return_t   kernResult = KERN_FAILURE;
 830     *bsdPath = '\0';
 831     nextMedia = IOIteratorNext( mediaIterator );
 832     if ( nextMedia )
 833     {
 834         CFTypeRef   bsdPathAsCFString;
 835     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 836         if ( bsdPathAsCFString ) {
 837             size_t devPathLength;
 838             strcpy( bsdPath, _PATH_DEV );
 839             strcat( bsdPath, "r" );
 840             devPathLength = strlen( bsdPath );
 841             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 842                 kernResult = KERN_SUCCESS;
 843             }
 844             CFRelease( bsdPathAsCFString );
 845         }
 846         IOObjectRelease( nextMedia );
 847     }
 848
 849     return kernResult;
 850 }
 851
 852 #endif
 853
 854 static int hdev_probe_device(const char *filename)
 855 {
 856     struct stat st;
 857
 858     /* allow a dedicated CD-ROM driver to match with a higher priority */
 859     if (strstart(filename, "/dev/cdrom", NULL))
 860         return 50;
 861
 862     if (stat(filename, &st) >= 0 &&
 863             (S_ISCHR(st.st_mode) || S_ISBLK(st.st_mode))) {
 864         return 100;
 865     }
 866
 867     return 0;
 868 }
 869
 870 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 871 {
 872     BDRVRawState *s = bs->opaque;
 873
 874 #ifdef CONFIG_COCOA
 875     if (strstart(filename, "/dev/cdrom", NULL)) {
 876         kern_return_t kernResult;
 877         io_iterator_t mediaIterator;
 878         char bsdPath[ MAXPATHLEN ];
 879         int fd;
 880
 881         kernResult = FindEjectableCDMedia( &mediaIterator );
 882         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 883
 884         if ( bsdPath[ 0 ] != '\0' ) {
 885             strcat(bsdPath,"s0");
 886             /* some CDs don't have a partition 0 */
 887             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 888             if (fd < 0) {
 889                 bsdPath[strlen(bsdPath)-1] = '1';
 890             } else {
 891                 close(fd);
 892             }
 893             filename = bsdPath;
 894         }
 895
 896         if ( mediaIterator )
 897             IOObjectRelease( mediaIterator );
 898     }
 899 #endif
 900
 901     s->type = FTYPE_FILE;
 902 #if defined(__linux__)
 903     if (strstart(filename, "/dev/sg", NULL)) {
 904         bs->sg = 1;
 905     }
 906 #endif
 907
 908     return raw_open_common(bs, filename, flags, 0);
 909 }
 910
 911 #if defined(__linux__)
 912 /* Note: we do not have a reliable method to detect if the floppy is
 913    present. The current method is to try to open the floppy at every
 914    I/O and to keep it opened during a few hundreds of ms. */
 915 static int fd_open(BlockDriverState *bs)
 916 {
 917     BDRVRawState *s = bs->opaque;
 918     int last_media_present;
 919
 920     if (s->type != FTYPE_FD)
 921         return 0;
 922     last_media_present = (s->fd >= 0);
 923     if (s->fd >= 0 &&
 924         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
 925         close(s->fd);
 926         s->fd = -1;
 927 #ifdef DEBUG_FLOPPY
 928         printf("Floppy closed\n");
 929 #endif
 930     }
 931     if (s->fd < 0) {
 932         if (s->fd_got_error &&
 933             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
 934 #ifdef DEBUG_FLOPPY
 935             printf("No floppy (open delayed)\n");
 936 #endif
 937             return -EIO;
 938         }
 939         s->fd = open(bs->filename, s->open_flags & ~O_NONBLOCK);
 940         if (s->fd < 0) {
 941             s->fd_error_time = qemu_get_clock(rt_clock);
 942             s->fd_got_error = 1;
 943             if (last_media_present)
 944                 s->fd_media_changed = 1;
 945 #ifdef DEBUG_FLOPPY
 946             printf("No floppy\n");
 947 #endif
 948             return -EIO;
 949         }
 950 #ifdef DEBUG_FLOPPY
 951         printf("Floppy opened\n");
 952 #endif
 953     }
 954     if (!last_media_present)
 955         s->fd_media_changed = 1;
 956     s->fd_open_time = qemu_get_clock(rt_clock);
 957     s->fd_got_error = 0;
 958     return 0;
 959 }
 960
 961 static int hdev_ioctl(BlockDriverState *bs, unsigned long int req, void *buf)
 962 {
 963     BDRVRawState *s = bs->opaque;
 964
 965     return ioctl(s->fd, req, buf);
 966 }
 967
 968 static BlockDriverAIOCB *hdev_aio_ioctl(BlockDriverState *bs,
 969         unsigned long int req, void *buf,
 970         BlockDriverCompletionFunc *cb, void *opaque)
 971 {
 972     BDRVRawState *s = bs->opaque;
 973
 974     if (fd_open(bs) < 0)
 975         return NULL;
 976     return paio_ioctl(bs, s->fd, req, buf, cb, opaque);
 977 }
 978
 979 #elif defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
 980 static int fd_open(BlockDriverState *bs)
 981 {
 982     BDRVRawState *s = bs->opaque;
 983
 984     /* this is just to ensure s->fd is sane (its called by io ops) */
 985     if (s->fd >= 0)
 986         return 0;
 987     return -EIO;
 988 }
 989 #else /* !linux && !FreeBSD */
 990
 991 static int fd_open(BlockDriverState *bs)
 992 {
 993     return 0;
 994 }
 995
 996 #endif /* !linux && !FreeBSD */
 997
 998 static int hdev_create(const char *filename, QEMUOptionParameter *options)
 999 {
1000     int fd;
1001     int ret = 0;
1002     struct stat stat_buf;
1003     int64_t total_size = 0;
1004
1005     /* Read out options */
1006     while (options && options->name) {
1007         if (!strcmp(options->name, "size")) {
1008             total_size = options->value.n / 512;
1009         }
1010         options++;
1011     }
1012
1013     fd = open(filename, O_WRONLY | O_BINARY);
1014     if (fd < 0)
1015         return -errno;
1016
1017     if (fstat(fd, &stat_buf) < 0)
1018         ret = -errno;
1019     else if (!S_ISBLK(stat_buf.st_mode) && !S_ISCHR(stat_buf.st_mode))
1020         ret = -ENODEV;
1021     else if (lseek(fd, 0, SEEK_END) < total_size * 512)
1022         ret = -ENOSPC;
1023
1024     close(fd);
1025     return ret;
1026 }
1027
1028 static BlockDriver bdrv_host_device = {
1029     .format_name        = "host_device",
1030     .protocol_name        = "host_device",
1031     .instance_size      = sizeof(BDRVRawState),
1032     .bdrv_probe_device  = hdev_probe_device,
1033     .bdrv_file_open     = hdev_open,
1034     .bdrv_close         = raw_close,
1035     .bdrv_create        = hdev_create,
1036     .create_options     = raw_create_options,
1037     .no_zero_init       = 1,
1038     .bdrv_flush         = raw_flush,
1039
1040     .bdrv_aio_readv     = raw_aio_readv,
1041     .bdrv_aio_writev    = raw_aio_writev,
1042     .bdrv_aio_flush     = raw_aio_flush,
1043
1044     .bdrv_read          = raw_read,
1045     .bdrv_write         = raw_write,
1046     .bdrv_getlength     = raw_getlength,
1047
1048     /* generic scsi device */
1049 #ifdef __linux__
1050     .bdrv_ioctl         = hdev_ioctl,
1051     .bdrv_aio_ioctl     = hdev_aio_ioctl,
1052 #endif
1053 };
1054
1055 #ifdef __linux__
1056 static int floppy_open(BlockDriverState *bs, const char *filename, int flags)
1057 {
1058     BDRVRawState *s = bs->opaque;
1059     int ret;
1060
1061     s->type = FTYPE_FD;
1062
1063     /* open will not fail even if no floppy is inserted, so add O_NONBLOCK */
1064     ret = raw_open_common(bs, filename, flags, O_NONBLOCK);
1065     if (ret)
1066         return ret;
1067
1068     /* close fd so that we can reopen it as needed */
1069     close(s->fd);
1070     s->fd = -1;
1071     s->fd_media_changed = 1;
1072
1073     return 0;
1074 }
1075
1076 static int floppy_probe_device(const char *filename)
1077 {
1078     int fd, ret;
1079     int prio = 0;
1080     struct floppy_struct fdparam;
1081
1082     if (strstart(filename, "/dev/fd", NULL))
1083         prio = 50;
1084
1085     fd = open(filename, O_RDONLY | O_NONBLOCK);
1086     if (fd < 0) {
1087         goto out;
1088     }
1089
1090     /* Attempt to detect via a floppy specific ioctl */
1091     ret = ioctl(fd, FDGETPRM, &fdparam);
1092     if (ret >= 0)
1093         prio = 100;
1094
1095     close(fd);
1096 out:
1097     return prio;
1098 }
1099
1100
1101 static int floppy_is_inserted(BlockDriverState *bs)
1102 {
1103     return fd_open(bs) >= 0;
1104 }
1105
1106 static int floppy_media_changed(BlockDriverState *bs)
1107 {
1108     BDRVRawState *s = bs->opaque;
1109     int ret;
1110
1111     /*
1112      * XXX: we do not have a true media changed indication.
1113      * It does not work if the floppy is changed without trying to read it.
1114      */
1115     fd_open(bs);
1116     ret = s->fd_media_changed;
1117     s->fd_media_changed = 0;
1118 #ifdef DEBUG_FLOPPY
1119     printf("Floppy changed=%d\n", ret);
1120 #endif
1121     return ret;
1122 }
1123
1124 static int floppy_eject(BlockDriverState *bs, int eject_flag)
1125 {
1126     BDRVRawState *s = bs->opaque;
1127     int fd;
1128
1129     if (s->fd >= 0) {
1130         close(s->fd);
1131         s->fd = -1;
1132     }
1133     fd = open(bs->filename, s->open_flags | O_NONBLOCK);
1134     if (fd >= 0) {
1135         if (ioctl(fd, FDEJECT, 0) < 0)
1136             perror("FDEJECT");
1137         close(fd);
1138     }
1139
1140     return 0;
1141 }
1142
1143 static BlockDriver bdrv_host_floppy = {
1144     .format_name        = "host_floppy",
1145     .protocol_name      = "host_floppy",
1146     .instance_size      = sizeof(BDRVRawState),
1147     .bdrv_probe_device  = floppy_probe_device,
1148     .bdrv_file_open     = floppy_open,
1149     .bdrv_close         = raw_close,
1150     .bdrv_create        = hdev_create,
1151     .create_options     = raw_create_options,
1152     .no_zero_init       = 1,
1153     .bdrv_flush         = raw_flush,
1154
1155     .bdrv_aio_readv     = raw_aio_readv,
1156     .bdrv_aio_writev    = raw_aio_writev,
1157     .bdrv_aio_flush     = raw_aio_flush,
1158
1159     .bdrv_read          = raw_read,
1160     .bdrv_write         = raw_write,
1161     .bdrv_getlength     = raw_getlength,
1162
1163     /* removable device support */
1164     .bdrv_is_inserted   = floppy_is_inserted,
1165     .bdrv_media_changed = floppy_media_changed,
1166     .bdrv_eject         = floppy_eject,
1167 };
1168
1169 static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
1170 {
1171     BDRVRawState *s = bs->opaque;
1172
1173     s->type = FTYPE_CD;
1174
1175     /* open will not fail even if no CD is inserted, so add O_NONBLOCK */
1176     return raw_open_common(bs, filename, flags, O_NONBLOCK);
1177 }
1178
1179 static int cdrom_probe_device(const char *filename)
1180 {
1181     int fd, ret;
1182     int prio = 0;
1183
1184     if (strstart(filename, "/dev/cd", NULL))
1185         prio = 50;
1186
1187     fd = open(filename, O_RDONLY | O_NONBLOCK);
1188     if (fd < 0) {
1189         goto out;
1190     }
1191
1192     /* Attempt to detect via a CDROM specific ioctl */
1193     ret = ioctl(fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1194     if (ret >= 0)
1195         prio = 100;
1196
1197     close(fd);
1198 out:
1199     return prio;
1200 }
1201
1202 static int cdrom_is_inserted(BlockDriverState *bs)
1203 {
1204     BDRVRawState *s = bs->opaque;
1205     int ret;
1206
1207     ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
1208     if (ret == CDS_DISC_OK)
1209         return 1;
1210     return 0;
1211 }
1212
1213 static int cdrom_eject(BlockDriverState *bs, int eject_flag)
1214 {
1215     BDRVRawState *s = bs->opaque;
1216
1217     if (eject_flag) {
1218         if (ioctl(s->fd, CDROMEJECT, NULL) < 0)
1219             perror("CDROMEJECT");
1220     } else {
1221         if (ioctl(s->fd, CDROMCLOSETRAY, NULL) < 0)
1222             perror("CDROMEJECT");
1223     }
1224
1225     return 0;
1226 }
1227
1228 static int cdrom_set_locked(BlockDriverState *bs, int locked)
1229 {
1230     BDRVRawState *s = bs->opaque;
1231
1232     if (ioctl(s->fd, CDROM_LOCKDOOR, locked) < 0) {
1233         /*
1234          * Note: an error can happen if the distribution automatically
1235          * mounts the CD-ROM
1236          */
1237         /* perror("CDROM_LOCKDOOR"); */
1238     }
1239
1240     return 0;
1241 }
1242
1243 static BlockDriver bdrv_host_cdrom = {
1244     .format_name        = "host_cdrom",
1245     .protocol_name      = "host_cdrom",
1246     .instance_size      = sizeof(BDRVRawState),
1247     .bdrv_probe_device  = cdrom_probe_device,
1248     .bdrv_file_open     = cdrom_open,
1249     .bdrv_close         = raw_close,
1250     .bdrv_create        = hdev_create,
1251     .create_options     = raw_create_options,
1252     .no_zero_init       = 1,
1253     .bdrv_flush         = raw_flush,
1254
1255     .bdrv_aio_readv     = raw_aio_readv,
1256     .bdrv_aio_writev    = raw_aio_writev,
1257     .bdrv_aio_flush     = raw_aio_flush,
1258
1259     .bdrv_read          = raw_read,
1260     .bdrv_write         = raw_write,
1261     .bdrv_getlength     = raw_getlength,
1262
1263     /* removable device support */
1264     .bdrv_is_inserted   = cdrom_is_inserted,
1265     .bdrv_eject         = cdrom_eject,
1266     .bdrv_set_locked    = cdrom_set_locked,
1267
1268     /* generic scsi device */
1269     .bdrv_ioctl         = hdev_ioctl,
1270     .bdrv_aio_ioctl     = hdev_aio_ioctl,
1271 };
1272 #endif /* __linux__ */
1273
1274 #if defined (__FreeBSD__) || defined(__FreeBSD_kernel__)
1275 static int cdrom_open(BlockDriverState *bs, const char *filename, int flags)
1276 {
1277     BDRVRawState *s = bs->opaque;
1278     int ret;
1279
1280     s->type = FTYPE_CD;
1281
1282     ret = raw_open_common(bs, filename, flags, 0);
1283     if (ret)
1284         return ret;
1285
1286     /* make sure the door isnt locked at this time */
1287     ioctl(s->fd, CDIOCALLOW);
1288     return 0;
1289 }
1290
1291 static int cdrom_probe_device(const char *filename)
1292 {
1293     if (strstart(filename, "/dev/cd", NULL) ||
1294             strstart(filename, "/dev/acd", NULL))
1295         return 100;
1296     return 0;
1297 }
1298
1299 static int cdrom_reopen(BlockDriverState *bs)
1300 {
1301     BDRVRawState *s = bs->opaque;
1302     int fd;
1303
1304     /*
1305      * Force reread of possibly changed/newly loaded disc,
1306      * FreeBSD seems to not notice sometimes...
1307      */
1308     if (s->fd >= 0)
1309         close(s->fd);
1310     fd = open(bs->filename, s->open_flags, 0644);
1311     if (fd < 0) {
1312         s->fd = -1;
1313         return -EIO;
1314     }
1315     s->fd = fd;
1316
1317     /* make sure the door isnt locked at this time */
1318     ioctl(s->fd, CDIOCALLOW);
1319     return 0;
1320 }
1321
1322 static int cdrom_is_inserted(BlockDriverState *bs)
1323 {
1324     return raw_getlength(bs) > 0;
1325 }
1326
1327 static int cdrom_eject(BlockDriverState *bs, int eject_flag)
1328 {
1329     BDRVRawState *s = bs->opaque;
1330
1331     if (s->fd < 0)
1332         return -ENOTSUP;
1333
1334     (void) ioctl(s->fd, CDIOCALLOW);
1335
1336     if (eject_flag) {
1337         if (ioctl(s->fd, CDIOCEJECT) < 0)
1338             perror("CDIOCEJECT");
1339     } else {
1340         if (ioctl(s->fd, CDIOCCLOSE) < 0)
1341             perror("CDIOCCLOSE");
1342     }
1343
1344     if (cdrom_reopen(bs) < 0)
1345         return -ENOTSUP;
1346     return 0;
1347 }
1348
1349 static int cdrom_set_locked(BlockDriverState *bs, int locked)
1350 {
1351     BDRVRawState *s = bs->opaque;
1352
1353     if (s->fd < 0)
1354         return -ENOTSUP;
1355     if (ioctl(s->fd, (locked ? CDIOCPREVENT : CDIOCALLOW)) < 0) {
1356         /*
1357          * Note: an error can happen if the distribution automatically
1358          * mounts the CD-ROM
1359          */
1360         /* perror("CDROM_LOCKDOOR"); */
1361     }
1362
1363     return 0;
1364 }
1365
1366 static BlockDriver bdrv_host_cdrom = {
1367     .format_name        = "host_cdrom",
1368     .protocol_name      = "host_cdrom",
1369     .instance_size      = sizeof(BDRVRawState),
1370     .bdrv_probe_device  = cdrom_probe_device,
1371     .bdrv_file_open     = cdrom_open,
1372     .bdrv_close         = raw_close,
1373     .bdrv_create        = hdev_create,
1374     .create_options     = raw_create_options,
1375     .no_zero_init       = 1,
1376     .bdrv_flush         = raw_flush,
1377
1378     .bdrv_aio_readv     = raw_aio_readv,
1379     .bdrv_aio_writev    = raw_aio_writev,
1380     .bdrv_aio_flush     = raw_aio_flush,
1381
1382     .bdrv_read          = raw_read,
1383     .bdrv_write         = raw_write,
1384     .bdrv_getlength     = raw_getlength,
1385
1386     /* removable device support */
1387     .bdrv_is_inserted   = cdrom_is_inserted,
1388     .bdrv_eject         = cdrom_eject,
1389     .bdrv_set_locked    = cdrom_set_locked,
1390 };
1391 #endif /* __FreeBSD__ */
1392
1393 static void bdrv_file_init(void)
1394 {
1395     /*
1396      * Register all the drivers.  Note that order is important, the driver
1397      * registered last will get probed first.
1398      */
1399     bdrv_register(&bdrv_file);
1400     bdrv_register(&bdrv_host_device);
1401 #ifdef __linux__
1402     bdrv_register(&bdrv_host_floppy);
1403     bdrv_register(&bdrv_host_cdrom);
1404 #endif
1405 #if defined(__FreeBSD__) || defined(__FreeBSD_kernel__)
1406     bdrv_register(&bdrv_host_cdrom);
1407 #endif
1408 }
1409
1410 block_init(bdrv_file_init);