block-raw.c

   1 /*
   2  * Block driver for RAW files
   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 "vl.h"
  25 #include "block_int.h"
  26 #include <assert.h>
  27 #ifndef _WIN32
  28 #include <aio.h>
  29
  30 #ifndef QEMU_TOOL
  31 #include "exec-all.h"
  32 #endif
  33
  34 #ifdef CONFIG_COCOA
  35 #include <paths.h>
  36 #include <sys/param.h>
  37 #include <IOKit/IOKitLib.h>
  38 #include <IOKit/IOBSD.h>
  39 #include <IOKit/storage/IOMediaBSDClient.h>
  40 #include <IOKit/storage/IOMedia.h>
  41 #include <IOKit/storage/IOCDMedia.h>
  42 //#include <IOKit/storage/IOCDTypes.h>
  43 #include <CoreFoundation/CoreFoundation.h>
  44 #endif
  45
  46 #ifdef __sun__
  47 #define _POSIX_PTHREAD_SEMANTICS 1
  48 #include <signal.h>
  49 #include <sys/dkio.h>
  50 #endif
  51 #ifdef __linux__
  52 #include <sys/ioctl.h>
  53 #include <linux/cdrom.h>
  54 #include <linux/fd.h>
  55 #endif
  56 #ifdef __FreeBSD__
  57 #include <sys/disk.h>
  58 #endif
  59
  60 //#define DEBUG_FLOPPY
  61
  62 #define DEBUG_BLOCK
  63 #if defined(DEBUG_BLOCK) && !defined(QEMU_TOOL)
  64 #define DEBUG_BLOCK_PRINT(formatCstr, args...) fprintf(logfile, formatCstr, ##args); fflush(logfile)
  65 #else
  66 #define DEBUG_BLOCK_PRINT(formatCstr, args...)
  67 #endif
  68
  69 #define FTYPE_FILE   0
  70 #define FTYPE_CD     1
  71 #define FTYPE_FD     2
  72
  73 /* if the FD is not accessed during that time (in ms), we try to
  74    reopen it to see if the disk has been changed */
  75 #define FD_OPEN_TIMEOUT 1000
  76
  77 typedef struct BDRVRawState {
  78     int fd;
  79     int type;
  80     unsigned int lseek_err_cnt;
  81 #if defined(__linux__)
  82     /* linux floppy specific */
  83     int fd_open_flags;
  84     int64_t fd_open_time;
  85     int64_t fd_error_time;
  86     int fd_got_error;
  87     int fd_media_changed;
  88 #endif
  89 } BDRVRawState;
  90
  91 static int fd_open(BlockDriverState *bs);
  92
  93 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
  94 {
  95     BDRVRawState *s = bs->opaque;
  96     int fd, open_flags, ret;
  97
  98     s->lseek_err_cnt = 0;
  99
 100     open_flags = O_BINARY;
 101     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 102         open_flags |= O_RDWR;
 103     } else {
 104         open_flags |= O_RDONLY;
 105         bs->read_only = 1;
 106     }
 107     if (flags & BDRV_O_CREAT)
 108         open_flags |= O_CREAT | O_TRUNC;
 109
 110     s->type = FTYPE_FILE;
 111
 112     fd = open(filename, open_flags, 0644);
 113     if (fd < 0) {
 114         ret = -errno;
 115         if (ret == -EROFS)
 116             ret = -EACCES;
 117         return ret;
 118     }
 119     s->fd = fd;
 120     return 0;
 121 }
 122
 123 /* XXX: use host sector size if necessary with:
 124 #ifdef DIOCGSECTORSIZE
 125         {
 126             unsigned int sectorsize = 512;
 127             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 128                 sectorsize > bufsize)
 129                 bufsize = sectorsize;
 130         }
 131 #endif
 132 #ifdef CONFIG_COCOA
 133         u_int32_t   blockSize = 512;
 134         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 135             bufsize = blockSize;
 136         }
 137 #endif
 138 */
 139
 140 static int raw_pread(BlockDriverState *bs, int64_t offset,
 141                      uint8_t *buf, int count)
 142 {
 143     BDRVRawState *s = bs->opaque;
 144     int ret;
 145
 146     ret = fd_open(bs);
 147     if (ret < 0)
 148         return ret;
 149
 150     if (lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 151         ++(s->lseek_err_cnt);
 152         if(s->lseek_err_cnt <= 10) {
 153             DEBUG_BLOCK_PRINT("raw_pread(%d:%s, %lld, %p, %d) [%lld] lseek failed : %d = %s\n",
 154                               s->fd, bs->filename, offset, buf, count,
 155                               bs->total_sectors, errno, strerror(errno));
 156         }
 157         return -1;
 158     }
 159     s->lseek_err_cnt=0;
 160
 161     ret = read(s->fd, buf, count);
 162     if (ret == count)
 163         goto label__raw_read__success;
 164
 165     DEBUG_BLOCK_PRINT("raw_read(%d:%s, %lld, %p, %d) [%lld] read failed %d : %d = %s\n",
 166                       s->fd, bs->filename, offset, buf, count,
 167                       bs->total_sectors, ret, errno, strerror(errno));
 168
 169     /* Try harder for CDrom. */
 170     if (bs->type == BDRV_TYPE_CDROM) {
 171         lseek(s->fd, offset, SEEK_SET);
 172         ret = read(s->fd, buf, count);
 173         if (ret == count)
 174             goto label__raw_read__success;
 175         lseek(s->fd, offset, SEEK_SET);
 176         ret = read(s->fd, buf, count);
 177         if (ret == count)
 178             goto label__raw_read__success;
 179
 180         DEBUG_BLOCK_PRINT("raw_read(%d:%s, %lld, %p, %d) [%lld] retry read failed %d : %d = %s\n",
 181                           s->fd, bs->filename, offset, buf, count,
 182                           bs->total_sectors, ret, errno, strerror(errno));
 183     }
 184
 185     return -1;
 186
 187 label__raw_read__success:
 188
 189     return ret;
 190 }
 191
 192 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 193                       const uint8_t *buf, int count)
 194 {
 195     BDRVRawState *s = bs->opaque;
 196     int ret;
 197
 198     ret = fd_open(bs);
 199     if (ret < 0)
 200         return ret;
 201
 202     if (lseek(s->fd, offset, SEEK_SET) == (off_t)-1) {
 203         ++(s->lseek_err_cnt);
 204         if(s->lseek_err_cnt) {
 205             DEBUG_BLOCK_PRINT("raw_write(%d:%s, %lld, %p, %d) [%lld] lseek failed : %d = %s\n",
 206                               s->fd, bs->filename, offset, buf, count,
 207                               bs->total_sectors, errno, strerror(errno));
 208         }
 209         return -1;
 210     }
 211     s->lseek_err_cnt = 0;
 212
 213     ret = write(s->fd, buf, count);
 214     if (ret == count)
 215         goto label__raw_write__success;
 216
 217     DEBUG_BLOCK_PRINT("raw_write(%d:%s, %lld, %p, %d) [%lld] write failed %d : %d = %s\n",
 218                       s->fd, bs->filename, offset, buf, count,
 219                       bs->total_sectors, ret, errno, strerror(errno));
 220
 221     return -1;
 222
 223 label__raw_write__success:
 224
 225     return ret;
 226 }
 227
 228 /***********************************************************/
 229 /* Unix AIO using POSIX AIO */
 230
 231 typedef struct RawAIOCB {
 232     BlockDriverAIOCB common;
 233     struct aiocb aiocb;
 234     struct RawAIOCB *next;
 235 } RawAIOCB;
 236
 237 static int aio_sig_num = SIGUSR2;
 238 static RawAIOCB *first_aio; /* AIO issued */
 239 static int aio_initialized = 0;
 240
 241 static void aio_signal_handler(int signum)
 242 {
 243 #ifndef QEMU_TOOL
 244     CPUState *env = cpu_single_env;
 245     if (env) {
 246         /* stop the currently executing cpu because a timer occured */
 247         cpu_interrupt(env, CPU_INTERRUPT_EXIT);
 248 #ifdef USE_KQEMU
 249         if (env->kqemu_enabled) {
 250             kqemu_cpu_interrupt(env);
 251         }
 252 #endif
 253     }
 254 #endif
 255 }
 256
 257 void qemu_aio_init(void)
 258 {
 259     struct sigaction act;
 260
 261     aio_initialized = 1;
 262
 263     sigfillset(&act.sa_mask);
 264     act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
 265     act.sa_handler = aio_signal_handler;
 266     sigaction(aio_sig_num, &act, NULL);
 267
 268 #if defined(__GLIBC__) && defined(__linux__)
 269     {
 270         /* XXX: aio thread exit seems to hang on RedHat 9 and this init
 271            seems to fix the problem. */
 272         struct aioinit ai;
 273         memset(&ai, 0, sizeof(ai));
 274         ai.aio_threads = 1;
 275         ai.aio_num = 1;
 276         ai.aio_idle_time = 365 * 100000;
 277         aio_init(&ai);
 278     }
 279 #endif
 280 }
 281
 282 void qemu_aio_poll(void)
 283 {
 284     RawAIOCB *acb, **pacb;
 285     int ret;
 286
 287     for(;;) {
 288         pacb = &first_aio;
 289         for(;;) {
 290             acb = *pacb;
 291             if (!acb)
 292                 goto the_end;
 293             ret = aio_error(&acb->aiocb);
 294             if (ret == ECANCELED) {
 295                 /* remove the request */
 296                 *pacb = acb->next;
 297                 qemu_aio_release(acb);
 298             } else if (ret != EINPROGRESS) {
 299                 /* end of aio */
 300                 if (ret == 0) {
 301                     ret = aio_return(&acb->aiocb);
 302                     if (ret == acb->aiocb.aio_nbytes)
 303                         ret = 0;
 304                     else
 305                         ret = -EINVAL;
 306                 } else {
 307                     ret = -ret;
 308                 }
 309                 /* remove the request */
 310                 *pacb = acb->next;
 311                 /* call the callback */
 312                 acb->common.cb(acb->common.opaque, ret);
 313                 qemu_aio_release(acb);
 314                 break;
 315             } else {
 316                 pacb = &acb->next;
 317             }
 318         }
 319     }
 320  the_end: ;
 321 }
 322
 323 /* Wait for all IO requests to complete.  */
 324 void qemu_aio_flush(void)
 325 {
 326     qemu_aio_wait_start();
 327     qemu_aio_poll();
 328     while (first_aio) {
 329         qemu_aio_wait();
 330     }
 331     qemu_aio_wait_end();
 332 }
 333
 334 /* wait until at least one AIO was handled */
 335 static sigset_t wait_oset;
 336
 337 void qemu_aio_wait_start(void)
 338 {
 339     sigset_t set;
 340
 341     if (!aio_initialized)
 342         qemu_aio_init();
 343     sigemptyset(&set);
 344     sigaddset(&set, aio_sig_num);
 345     sigprocmask(SIG_BLOCK, &set, &wait_oset);
 346 }
 347
 348 void qemu_aio_wait(void)
 349 {
 350     sigset_t set;
 351     int nb_sigs;
 352
 353 #ifndef QEMU_TOOL
 354     if (qemu_bh_poll())
 355         return;
 356 #endif
 357     sigemptyset(&set);
 358     sigaddset(&set, aio_sig_num);
 359     sigwait(&set, &nb_sigs);
 360     qemu_aio_poll();
 361 }
 362
 363 void qemu_aio_wait_end(void)
 364 {
 365     sigprocmask(SIG_SETMASK, &wait_oset, NULL);
 366 }
 367
 368 static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
 369         int64_t sector_num, uint8_t *buf, int nb_sectors,
 370         BlockDriverCompletionFunc *cb, void *opaque)
 371 {
 372     BDRVRawState *s = bs->opaque;
 373     RawAIOCB *acb;
 374
 375     if (fd_open(bs) < 0)
 376         return NULL;
 377
 378     acb = qemu_aio_get(bs, cb, opaque);
 379     if (!acb)
 380         return NULL;
 381     acb->aiocb.aio_fildes = s->fd;
 382     acb->aiocb.aio_sigevent.sigev_signo = aio_sig_num;
 383     acb->aiocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
 384     acb->aiocb.aio_buf = buf;
 385     acb->aiocb.aio_nbytes = nb_sectors * 512;
 386     acb->aiocb.aio_offset = sector_num * 512;
 387     acb->next = first_aio;
 388     first_aio = acb;
 389     return acb;
 390 }
 391
 392 static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
 393         int64_t sector_num, uint8_t *buf, int nb_sectors,
 394         BlockDriverCompletionFunc *cb, void *opaque)
 395 {
 396     RawAIOCB *acb;
 397
 398     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
 399     if (!acb)
 400         return NULL;
 401     if (aio_read(&acb->aiocb) < 0) {
 402         qemu_aio_release(acb);
 403         return NULL;
 404     }
 405     return &acb->common;
 406 }
 407
 408 static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
 409         int64_t sector_num, const uint8_t *buf, int nb_sectors,
 410         BlockDriverCompletionFunc *cb, void *opaque)
 411 {
 412     RawAIOCB *acb;
 413
 414     acb = raw_aio_setup(bs, sector_num, (uint8_t*)buf, nb_sectors, cb, opaque);
 415     if (!acb)
 416         return NULL;
 417     if (aio_write(&acb->aiocb) < 0) {
 418         qemu_aio_release(acb);
 419         return NULL;
 420     }
 421     return &acb->common;
 422 }
 423
 424 static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
 425 {
 426     int ret;
 427     RawAIOCB *acb = (RawAIOCB *)blockacb;
 428     RawAIOCB **pacb;
 429
 430     ret = aio_cancel(acb->aiocb.aio_fildes, &acb->aiocb);
 431     if (ret == AIO_NOTCANCELED) {
 432         /* fail safe: if the aio could not be canceled, we wait for
 433            it */
 434         while (aio_error(&acb->aiocb) == EINPROGRESS);
 435     }
 436
 437     /* remove the callback from the queue */
 438     pacb = &first_aio;
 439     for(;;) {
 440         if (*pacb == NULL) {
 441             break;
 442         } else if (*pacb == acb) {
 443             *pacb = acb->next;
 444             qemu_aio_release(acb);
 445             break;
 446         }
 447         pacb = &acb->next;
 448     }
 449 }
 450
 451 static void raw_close(BlockDriverState *bs)
 452 {
 453     BDRVRawState *s = bs->opaque;
 454     if (s->fd >= 0) {
 455         close(s->fd);
 456         s->fd = -1;
 457     }
 458 }
 459
 460 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 461 {
 462     BDRVRawState *s = bs->opaque;
 463     if (s->type != FTYPE_FILE)
 464         return -ENOTSUP;
 465     if (ftruncate(s->fd, offset) < 0)
 466         return -errno;
 467     return 0;
 468 }
 469
 470 static int64_t  raw_getlength(BlockDriverState *bs)
 471 {
 472     BDRVRawState *s = bs->opaque;
 473     int fd = s->fd;
 474     int64_t size;
 475 #ifdef _BSD
 476     struct stat sb;
 477 #endif
 478 #ifdef __sun__
 479     struct dk_minfo minfo;
 480     int rv;
 481 #endif
 482     int ret;
 483
 484     ret = fd_open(bs);
 485     if (ret < 0)
 486         return ret;
 487
 488 #ifdef _BSD
 489     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 490 #ifdef DIOCGMEDIASIZE
 491         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 492 #endif
 493 #ifdef CONFIG_COCOA
 494         size = LONG_LONG_MAX;
 495 #else
 496         size = lseek(fd, 0LL, SEEK_END);
 497 #endif
 498     } else
 499 #endif
 500 #ifdef __sun__
 501     /*
 502      * use the DKIOCGMEDIAINFO ioctl to read the size.
 503      */
 504     rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
 505     if ( rv != -1 ) {
 506         size = minfo.dki_lbsize * minfo.dki_capacity;
 507     } else /* there are reports that lseek on some devices
 508               fails, but irc discussion said that contingency
 509               on contingency was overkill */
 510 #endif
 511     {
 512         size = lseek(fd, 0, SEEK_END);
 513     }
 514     return size;
 515 }
 516
 517 static int raw_create(const char *filename, int64_t total_size,
 518                       const char *backing_file, int flags)
 519 {
 520     int fd;
 521
 522     if (flags || backing_file)
 523         return -ENOTSUP;
 524
 525     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 526               0644);
 527     if (fd < 0)
 528         return -EIO;
 529     ftruncate(fd, total_size * 512);
 530     close(fd);
 531     return 0;
 532 }
 533
 534 static void raw_flush(BlockDriverState *bs)
 535 {
 536     BDRVRawState *s = bs->opaque;
 537     fsync(s->fd);
 538 }
 539
 540 BlockDriver bdrv_raw = {
 541     "raw",
 542     sizeof(BDRVRawState),
 543     NULL, /* no probe for protocols */
 544     raw_open,
 545     NULL,
 546     NULL,
 547     raw_close,
 548     raw_create,
 549     raw_flush,
 550
 551     .bdrv_aio_read = raw_aio_read,
 552     .bdrv_aio_write = raw_aio_write,
 553     .bdrv_aio_cancel = raw_aio_cancel,
 554     .aiocb_size = sizeof(RawAIOCB),
 555     .protocol_name = "file",
 556     .bdrv_pread = raw_pread,
 557     .bdrv_pwrite = raw_pwrite,
 558     .bdrv_truncate = raw_truncate,
 559     .bdrv_getlength = raw_getlength,
 560 };
 561
 562 /***********************************************/
 563 /* host device */
 564
 565 #ifdef CONFIG_COCOA
 566 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
 567 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
 568
 569 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
 570 {
 571     kern_return_t       kernResult;
 572     mach_port_t     masterPort;
 573     CFMutableDictionaryRef  classesToMatch;
 574
 575     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
 576     if ( KERN_SUCCESS != kernResult ) {
 577         printf( "IOMasterPort returned %d\n", kernResult );
 578     }
 579
 580     classesToMatch = IOServiceMatching( kIOCDMediaClass );
 581     if ( classesToMatch == NULL ) {
 582         printf( "IOServiceMatching returned a NULL dictionary.\n" );
 583     } else {
 584     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
 585     }
 586     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
 587     if ( KERN_SUCCESS != kernResult )
 588     {
 589         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
 590     }
 591
 592     return kernResult;
 593 }
 594
 595 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
 596 {
 597     io_object_t     nextMedia;
 598     kern_return_t   kernResult = KERN_FAILURE;
 599     *bsdPath = '\0';
 600     nextMedia = IOIteratorNext( mediaIterator );
 601     if ( nextMedia )
 602     {
 603         CFTypeRef   bsdPathAsCFString;
 604     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
 605         if ( bsdPathAsCFString ) {
 606             size_t devPathLength;
 607             strcpy( bsdPath, _PATH_DEV );
 608             strcat( bsdPath, "r" );
 609             devPathLength = strlen( bsdPath );
 610             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 611                 kernResult = KERN_SUCCESS;
 612             }
 613             CFRelease( bsdPathAsCFString );
 614         }
 615         IOObjectRelease( nextMedia );
 616     }
 617
 618     return kernResult;
 619 }
 620
 621 #endif
 622
 623 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
 624 {
 625     BDRVRawState *s = bs->opaque;
 626     int fd, open_flags, ret;
 627
 628 #ifdef CONFIG_COCOA
 629     if (strstart(filename, "/dev/cdrom", NULL)) {
 630         kern_return_t kernResult;
 631         io_iterator_t mediaIterator;
 632         char bsdPath[ MAXPATHLEN ];
 633         int fd;
 634
 635         kernResult = FindEjectableCDMedia( &mediaIterator );
 636         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 637
 638         if ( bsdPath[ 0 ] != '\0' ) {
 639             strcat(bsdPath,"s0");
 640             /* some CDs don't have a partition 0 */
 641             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 642             if (fd < 0) {
 643                 bsdPath[strlen(bsdPath)-1] = '1';
 644             } else {
 645                 close(fd);
 646             }
 647             filename = bsdPath;
 648         }
 649
 650         if ( mediaIterator )
 651             IOObjectRelease( mediaIterator );
 652     }
 653 #endif
 654     open_flags = O_BINARY;
 655     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 656         open_flags |= O_RDWR;
 657     } else {
 658         open_flags |= O_RDONLY;
 659         bs->read_only = 1;
 660     }
 661
 662     s->type = FTYPE_FILE;
 663 #if defined(__linux__)
 664     if (strstart(filename, "/dev/cd", NULL)) {
 665         /* open will not fail even if no CD is inserted */
 666         open_flags |= O_NONBLOCK;
 667         s->type = FTYPE_CD;
 668     } else if (strstart(filename, "/dev/fd", NULL)) {
 669         s->type = FTYPE_FD;
 670         s->fd_open_flags = open_flags;
 671         /* open will not fail even if no floppy is inserted */
 672         open_flags |= O_NONBLOCK;
 673     }
 674 #endif
 675     fd = open(filename, open_flags, 0644);
 676     if (fd < 0) {
 677         ret = -errno;
 678         if (ret == -EROFS)
 679             ret = -EACCES;
 680         return ret;
 681     }
 682     s->fd = fd;
 683 #if defined(__linux__)
 684     /* close fd so that we can reopen it as needed */
 685     if (s->type == FTYPE_FD) {
 686         close(s->fd);
 687         s->fd = -1;
 688         s->fd_media_changed = 1;
 689     }
 690 #endif
 691     return 0;
 692 }
 693
 694 #if defined(__linux__) && !defined(QEMU_TOOL)
 695
 696 /* Note: we do not have a reliable method to detect if the floppy is
 697    present. The current method is to try to open the floppy at every
 698    I/O and to keep it opened during a few hundreds of ms. */
 699 static int fd_open(BlockDriverState *bs)
 700 {
 701     BDRVRawState *s = bs->opaque;
 702     int last_media_present;
 703
 704     if (s->type != FTYPE_FD)
 705         return 0;
 706     last_media_present = (s->fd >= 0);
 707     if (s->fd >= 0 &&
 708         (qemu_get_clock(rt_clock) - s->fd_open_time) >= FD_OPEN_TIMEOUT) {
 709         close(s->fd);
 710         s->fd = -1;
 711 #ifdef DEBUG_FLOPPY
 712         printf("Floppy closed\n");
 713 #endif
 714     }
 715     if (s->fd < 0) {
 716         if (s->fd_got_error &&
 717             (qemu_get_clock(rt_clock) - s->fd_error_time) < FD_OPEN_TIMEOUT) {
 718 #ifdef DEBUG_FLOPPY
 719             printf("No floppy (open delayed)\n");
 720 #endif
 721             return -EIO;
 722         }
 723         s->fd = open(bs->filename, s->fd_open_flags);
 724         if (s->fd < 0) {
 725             s->fd_error_time = qemu_get_clock(rt_clock);
 726             s->fd_got_error = 1;
 727             if (last_media_present)
 728                 s->fd_media_changed = 1;
 729 #ifdef DEBUG_FLOPPY
 730             printf("No floppy\n");
 731 #endif
 732             return -EIO;
 733         }
 734 #ifdef DEBUG_FLOPPY
 735         printf("Floppy opened\n");
 736 #endif
 737     }
 738     if (!last_media_present)
 739         s->fd_media_changed = 1;
 740     s->fd_open_time = qemu_get_clock(rt_clock);
 741     s->fd_got_error = 0;
 742     return 0;
 743 }
 744 #else
 745 static int fd_open(BlockDriverState *bs)
 746 {
 747     return 0;
 748 }
 749 #endif
 750
 751 #if defined(__linux__)
 752
 753 static int raw_is_inserted(BlockDriverState *bs)
 754 {
 755     BDRVRawState *s = bs->opaque;
 756     int ret;
 757
 758     switch(s->type) {
 759     case FTYPE_CD:
 760         ret = ioctl(s->fd, CDROM_DRIVE_STATUS, CDSL_CURRENT);
 761         if (ret == CDS_DISC_OK)
 762             return 1;
 763         else
 764             return 0;
 765         break;
 766     case FTYPE_FD:
 767         ret = fd_open(bs);
 768         return (ret >= 0);
 769     default:
 770         return 1;
 771     }
 772 }
 773
 774 /* currently only used by fdc.c, but a CD version would be good too */
 775 static int raw_media_changed(BlockDriverState *bs)
 776 {
 777     BDRVRawState *s = bs->opaque;
 778
 779     switch(s->type) {
 780     case FTYPE_FD:
 781         {
 782             int ret;
 783             /* XXX: we do not have a true media changed indication. It
 784                does not work if the floppy is changed without trying
 785                to read it */
 786             fd_open(bs);
 787             ret = s->fd_media_changed;
 788             s->fd_media_changed = 0;
 789 #ifdef DEBUG_FLOPPY
 790             printf("Floppy changed=%d\n", ret);
 791 #endif
 792             return ret;
 793         }
 794     default:
 795         return -ENOTSUP;
 796     }
 797 }
 798
 799 static int raw_eject(BlockDriverState *bs, int eject_flag)
 800 {
 801     BDRVRawState *s = bs->opaque;
 802
 803     switch(s->type) {
 804     case FTYPE_CD:
 805         if (eject_flag) {
 806             if (ioctl (s->fd, CDROMEJECT, NULL) < 0)
 807                 perror("CDROMEJECT");
 808         } else {
 809             if (ioctl (s->fd, CDROMCLOSETRAY, NULL) < 0)
 810                 perror("CDROMEJECT");
 811         }
 812         break;
 813     case FTYPE_FD:
 814         {
 815             int fd;
 816             if (s->fd >= 0) {
 817                 close(s->fd);
 818                 s->fd = -1;
 819             }
 820             fd = open(bs->filename, s->fd_open_flags | O_NONBLOCK);
 821             if (fd >= 0) {
 822                 if (ioctl(fd, FDEJECT, 0) < 0)
 823                     perror("FDEJECT");
 824                 close(fd);
 825             }
 826         }
 827         break;
 828     default:
 829         return -ENOTSUP;
 830     }
 831     return 0;
 832 }
 833
 834 static int raw_set_locked(BlockDriverState *bs, int locked)
 835 {
 836     BDRVRawState *s = bs->opaque;
 837
 838     switch(s->type) {
 839     case FTYPE_CD:
 840         if (ioctl (s->fd, CDROM_LOCKDOOR, locked) < 0) {
 841             /* Note: an error can happen if the distribution automatically
 842                mounts the CD-ROM */
 843             //        perror("CDROM_LOCKDOOR");
 844         }
 845         break;
 846     default:
 847         return -ENOTSUP;
 848     }
 849     return 0;
 850 }
 851
 852 #else
 853
 854 static int raw_is_inserted(BlockDriverState *bs)
 855 {
 856     return 1;
 857 }
 858
 859 static int raw_media_changed(BlockDriverState *bs)
 860 {
 861     return -ENOTSUP;
 862 }
 863
 864 static int raw_eject(BlockDriverState *bs, int eject_flag)
 865 {
 866     return -ENOTSUP;
 867 }
 868
 869 static int raw_set_locked(BlockDriverState *bs, int locked)
 870 {
 871     return -ENOTSUP;
 872 }
 873
 874 #endif /* !linux */
 875
 876 BlockDriver bdrv_host_device = {
 877     "host_device",
 878     sizeof(BDRVRawState),
 879     NULL, /* no probe for protocols */
 880     hdev_open,
 881     NULL,
 882     NULL,
 883     raw_close,
 884     NULL,
 885     raw_flush,
 886
 887     .bdrv_aio_read = raw_aio_read,
 888     .bdrv_aio_write = raw_aio_write,
 889     .bdrv_aio_cancel = raw_aio_cancel,
 890     .aiocb_size = sizeof(RawAIOCB),
 891     .bdrv_pread = raw_pread,
 892     .bdrv_pwrite = raw_pwrite,
 893     .bdrv_getlength = raw_getlength,
 894
 895     /* removable device support */
 896     .bdrv_is_inserted = raw_is_inserted,
 897     .bdrv_media_changed = raw_media_changed,
 898     .bdrv_eject = raw_eject,
 899     .bdrv_set_locked = raw_set_locked,
 900 };
 901
 902 #else /* _WIN32 */
 903
 904 /* XXX: use another file ? */
 905 #include <winioctl.h>
 906
 907 #define FTYPE_FILE 0
 908 #define FTYPE_CD     1
 909 #define FTYPE_HARDDISK 2
 910
 911 typedef struct BDRVRawState {
 912     HANDLE hfile;
 913     int type;
 914     char drive_path[16]; /* format: "d:\" */
 915 } BDRVRawState;
 916
 917 typedef struct RawAIOCB {
 918     BlockDriverAIOCB common;
 919     HANDLE hEvent;
 920     OVERLAPPED ov;
 921     int count;
 922 } RawAIOCB;
 923
 924 int qemu_ftruncate64(int fd, int64_t length)
 925 {
 926     LARGE_INTEGER li;
 927     LONG high;
 928     HANDLE h;
 929     BOOL res;
 930
 931     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 932         return -1;
 933
 934     h = (HANDLE)_get_osfhandle(fd);
 935
 936     /* get current position, ftruncate do not change position */
 937     li.HighPart = 0;
 938     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
 939     if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 940         return -1;
 941
 942     high = length >> 32;
 943     if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
 944         return -1;
 945     res = SetEndOfFile(h);
 946
 947     /* back to old position */
 948     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
 949     return res ? 0 : -1;
 950 }
 951
 952 static int set_sparse(int fd)
 953 {
 954     DWORD returned;
 955     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 956                                  NULL, 0, NULL, 0, &returned, NULL);
 957 }
 958
 959 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 960 {
 961     BDRVRawState *s = bs->opaque;
 962     int access_flags, create_flags;
 963     DWORD overlapped;
 964
 965     s->type = FTYPE_FILE;
 966
 967     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 968         access_flags = GENERIC_READ | GENERIC_WRITE;
 969     } else {
 970         access_flags = GENERIC_READ;
 971     }
 972     if (flags & BDRV_O_CREAT) {
 973         create_flags = CREATE_ALWAYS;
 974     } else {
 975         create_flags = OPEN_EXISTING;
 976     }
 977 #ifdef QEMU_TOOL
 978     overlapped = FILE_ATTRIBUTE_NORMAL;
 979 #else
 980     overlapped = FILE_FLAG_OVERLAPPED;
 981 #endif
 982     s->hfile = CreateFile(filename, access_flags,
 983                           FILE_SHARE_READ, NULL,
 984                           create_flags, overlapped, NULL);
 985     if (s->hfile == INVALID_HANDLE_VALUE) {
 986         int err = GetLastError();
 987
 988         if (err == ERROR_ACCESS_DENIED)
 989             return -EACCES;
 990         return -1;
 991     }
 992     return 0;
 993 }
 994
 995 static int raw_pread(BlockDriverState *bs, int64_t offset,
 996                      uint8_t *buf, int count)
 997 {
 998     BDRVRawState *s = bs->opaque;
 999     OVERLAPPED ov;
1000     DWORD ret_count;
1001     int ret;
1002
1003     memset(&ov, 0, sizeof(ov));
1004     ov.Offset = offset;
1005     ov.OffsetHigh = offset >> 32;
1006     ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
1007     if (!ret) {
1008         ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
1009         if (!ret)
1010             return -EIO;
1011         else
1012             return ret_count;
1013     }
1014     return ret_count;
1015 }
1016
1017 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
1018                       const uint8_t *buf, int count)
1019 {
1020     BDRVRawState *s = bs->opaque;
1021     OVERLAPPED ov;
1022     DWORD ret_count;
1023     int ret;
1024
1025     memset(&ov, 0, sizeof(ov));
1026     ov.Offset = offset;
1027     ov.OffsetHigh = offset >> 32;
1028     ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
1029     if (!ret) {
1030         ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
1031         if (!ret)
1032             return -EIO;
1033         else
1034             return ret_count;
1035     }
1036     return ret_count;
1037 }
1038
1039 #if 0
1040 #ifndef QEMU_TOOL
1041 static void raw_aio_cb(void *opaque)
1042 {
1043     RawAIOCB *acb = opaque;
1044     BlockDriverState *bs = acb->common.bs;
1045     BDRVRawState *s = bs->opaque;
1046     DWORD ret_count;
1047     int ret;
1048
1049     ret = GetOverlappedResult(s->hfile, &acb->ov, &ret_count, TRUE);
1050     if (!ret || ret_count != acb->count) {
1051         acb->common.cb(acb->common.opaque, -EIO);
1052     } else {
1053         acb->common.cb(acb->common.opaque, 0);
1054     }
1055 }
1056 #endif
1057
1058 static RawAIOCB *raw_aio_setup(BlockDriverState *bs,
1059         int64_t sector_num, uint8_t *buf, int nb_sectors,
1060         BlockDriverCompletionFunc *cb, void *opaque)
1061 {
1062     RawAIOCB *acb;
1063     int64_t offset;
1064
1065     acb = qemu_aio_get(bs, cb, opaque);
1066     if (acb->hEvent) {
1067         acb->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
1068         if (!acb->hEvent) {
1069             qemu_aio_release(acb);
1070             return NULL;
1071         }
1072     }
1073     memset(&acb->ov, 0, sizeof(acb->ov));
1074     offset = sector_num * 512;
1075     acb->ov.Offset = offset;
1076     acb->ov.OffsetHigh = offset >> 32;
1077     acb->ov.hEvent = acb->hEvent;
1078     acb->count = nb_sectors * 512;
1079 #ifndef QEMU_TOOL
1080     qemu_add_wait_object(acb->ov.hEvent, raw_aio_cb, acb);
1081 #endif
1082     return acb;
1083 }
1084
1085 static BlockDriverAIOCB *raw_aio_read(BlockDriverState *bs,
1086         int64_t sector_num, uint8_t *buf, int nb_sectors,
1087         BlockDriverCompletionFunc *cb, void *opaque)
1088 {
1089     BDRVRawState *s = bs->opaque;
1090     RawAIOCB *acb;
1091     int ret;
1092
1093     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
1094     if (!acb)
1095         return NULL;
1096     ret = ReadFile(s->hfile, buf, acb->count, NULL, &acb->ov);
1097     if (!ret) {
1098         qemu_aio_release(acb);
1099         return NULL;
1100     }
1101 #ifdef QEMU_TOOL
1102     qemu_aio_release(acb);
1103 #endif
1104     return (BlockDriverAIOCB *)acb;
1105 }
1106
1107 static BlockDriverAIOCB *raw_aio_write(BlockDriverState *bs,
1108         int64_t sector_num, uint8_t *buf, int nb_sectors,
1109         BlockDriverCompletionFunc *cb, void *opaque)
1110 {
1111     BDRVRawState *s = bs->opaque;
1112     RawAIOCB *acb;
1113     int ret;
1114
1115     acb = raw_aio_setup(bs, sector_num, buf, nb_sectors, cb, opaque);
1116     if (!acb)
1117         return NULL;
1118     ret = WriteFile(s->hfile, buf, acb->count, NULL, &acb->ov);
1119     if (!ret) {
1120         qemu_aio_release(acb);
1121         return NULL;
1122     }
1123 #ifdef QEMU_TOOL
1124     qemu_aio_release(acb);
1125 #endif
1126     return (BlockDriverAIOCB *)acb;
1127 }
1128
1129 static void raw_aio_cancel(BlockDriverAIOCB *blockacb)
1130 {
1131 #ifndef QEMU_TOOL
1132     RawAIOCB *acb = (RawAIOCB *)blockacb;
1133     BlockDriverState *bs = acb->common.bs;
1134     BDRVRawState *s = bs->opaque;
1135
1136     qemu_del_wait_object(acb->ov.hEvent, raw_aio_cb, acb);
1137     /* XXX: if more than one async I/O it is not correct */
1138     CancelIo(s->hfile);
1139     qemu_aio_release(acb);
1140 #endif
1141 }
1142 #endif /* #if 0 */
1143
1144 static void raw_flush(BlockDriverState *bs)
1145 {
1146     BDRVRawState *s = bs->opaque;
1147     FlushFileBuffers(s->hfile);
1148 }
1149
1150 static void raw_close(BlockDriverState *bs)
1151 {
1152     BDRVRawState *s = bs->opaque;
1153     CloseHandle(s->hfile);
1154 }
1155
1156 static int raw_truncate(BlockDriverState *bs, int64_t offset)
1157 {
1158     BDRVRawState *s = bs->opaque;
1159     DWORD low, high;
1160
1161     low = offset;
1162     high = offset >> 32;
1163     if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
1164         return -EIO;
1165     if (!SetEndOfFile(s->hfile))
1166         return -EIO;
1167     return 0;
1168 }
1169
1170 static int64_t raw_getlength(BlockDriverState *bs)
1171 {
1172     BDRVRawState *s = bs->opaque;
1173     LARGE_INTEGER l;
1174     ULARGE_INTEGER available, total, total_free;
1175     DISK_GEOMETRY dg;
1176     DWORD count;
1177     BOOL status;
1178
1179     switch(s->type) {
1180     case FTYPE_FILE:
1181         l.LowPart = GetFileSize(s->hfile, &l.HighPart);
1182         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
1183             return -EIO;
1184         break;
1185     case FTYPE_CD:
1186         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
1187             return -EIO;
1188         l.QuadPart = total.QuadPart;
1189         break;
1190     case FTYPE_HARDDISK:
1191         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY,
1192                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
1193         if (status != FALSE) {
1194             l.QuadPart = dg.Cylinders.QuadPart * dg.TracksPerCylinder
1195                 * dg.SectorsPerTrack * dg.BytesPerSector;
1196         }
1197         break;
1198     default:
1199         return -EIO;
1200     }
1201     return l.QuadPart;
1202 }
1203
1204 static int raw_create(const char *filename, int64_t total_size,
1205                       const char *backing_file, int flags)
1206 {
1207     int fd;
1208
1209     if (flags || backing_file)
1210         return -ENOTSUP;
1211
1212     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
1213               0644);
1214     if (fd < 0)
1215         return -EIO;
1216     set_sparse(fd);
1217     ftruncate(fd, total_size * 512);
1218     close(fd);
1219     return 0;
1220 }
1221
1222 void qemu_aio_init(void)
1223 {
1224 }
1225
1226 void qemu_aio_poll(void)
1227 {
1228 }
1229
1230 void qemu_aio_flush(void)
1231 {
1232 }
1233
1234 void qemu_aio_wait_start(void)
1235 {
1236 }
1237
1238 void qemu_aio_wait(void)
1239 {
1240 #ifndef QEMU_TOOL
1241     qemu_bh_poll();
1242 #endif
1243 }
1244
1245 void qemu_aio_wait_end(void)
1246 {
1247 }
1248
1249 BlockDriver bdrv_raw = {
1250     "raw",
1251     sizeof(BDRVRawState),
1252     NULL, /* no probe for protocols */
1253     raw_open,
1254     NULL,
1255     NULL,
1256     raw_close,
1257     raw_create,
1258     raw_flush,
1259
1260 #if 0
1261     .bdrv_aio_read = raw_aio_read,
1262     .bdrv_aio_write = raw_aio_write,
1263     .bdrv_aio_cancel = raw_aio_cancel,
1264     .aiocb_size = sizeof(RawAIOCB);
1265 #endif
1266     .protocol_name = "file",
1267     .bdrv_pread = raw_pread,
1268     .bdrv_pwrite = raw_pwrite,
1269     .bdrv_truncate = raw_truncate,
1270     .bdrv_getlength = raw_getlength,
1271 };
1272
1273 /***********************************************/
1274 /* host device */
1275
1276 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
1277 {
1278     char drives[256], *pdrv = drives;
1279     UINT type;
1280
1281     memset(drives, 0, sizeof(drives));
1282     GetLogicalDriveStrings(sizeof(drives), drives);
1283     while(pdrv[0] != '\0') {
1284         type = GetDriveType(pdrv);
1285         switch(type) {
1286         case DRIVE_CDROM:
1287             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
1288             return 0;
1289             break;
1290         }
1291         pdrv += lstrlen(pdrv) + 1;
1292     }
1293     return -1;
1294 }
1295
1296 static int find_device_type(BlockDriverState *bs, const char *filename)
1297 {
1298     BDRVRawState *s = bs->opaque;
1299     UINT type;
1300     const char *p;
1301
1302     if (strstart(filename, "\\\\.\\", &p) ||
1303         strstart(filename, "//./", &p)) {
1304         if (stristart(p, "PhysicalDrive", NULL))
1305             return FTYPE_HARDDISK;
1306         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
1307         type = GetDriveType(s->drive_path);
1308         if (type == DRIVE_CDROM)
1309             return FTYPE_CD;
1310         else
1311             return FTYPE_FILE;
1312     } else {
1313         return FTYPE_FILE;
1314     }
1315 }
1316
1317 static int hdev_open(BlockDriverState *bs, const char *filename, int flags)
1318 {
1319     BDRVRawState *s = bs->opaque;
1320     int access_flags, create_flags;
1321     DWORD overlapped;
1322     char device_name[64];
1323
1324     if (strstart(filename, "/dev/cdrom", NULL)) {
1325         if (find_cdrom(device_name, sizeof(device_name)) < 0)
1326             return -ENOENT;
1327         filename = device_name;
1328     } else {
1329         /* transform drive letters into device name */
1330         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
1331              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
1332             filename[1] == ':' && filename[2] == '\0') {
1333             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
1334             filename = device_name;
1335         }
1336     }
1337     s->type = find_device_type(bs, filename);
1338
1339     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
1340         access_flags = GENERIC_READ | GENERIC_WRITE;
1341     } else {
1342         access_flags = GENERIC_READ;
1343     }
1344     create_flags = OPEN_EXISTING;
1345
1346 #ifdef QEMU_TOOL
1347     overlapped = FILE_ATTRIBUTE_NORMAL;
1348 #else
1349     overlapped = FILE_FLAG_OVERLAPPED;
1350 #endif
1351     s->hfile = CreateFile(filename, access_flags,
1352                           FILE_SHARE_READ, NULL,
1353                           create_flags, overlapped, NULL);
1354     if (s->hfile == INVALID_HANDLE_VALUE) {
1355         int err = GetLastError();
1356
1357         if (err == ERROR_ACCESS_DENIED)
1358             return -EACCES;
1359         return -1;
1360     }
1361     return 0;
1362 }
1363
1364 #if 0
1365 /***********************************************/
1366 /* removable device additional commands */
1367
1368 static int raw_is_inserted(BlockDriverState *bs)
1369 {
1370     return 1;
1371 }
1372
1373 static int raw_media_changed(BlockDriverState *bs)
1374 {
1375     return -ENOTSUP;
1376 }
1377
1378 static int raw_eject(BlockDriverState *bs, int eject_flag)
1379 {
1380     DWORD ret_count;
1381
1382     if (s->type == FTYPE_FILE)
1383         return -ENOTSUP;
1384     if (eject_flag) {
1385         DeviceIoControl(s->hfile, IOCTL_STORAGE_EJECT_MEDIA,
1386                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
1387     } else {
1388         DeviceIoControl(s->hfile, IOCTL_STORAGE_LOAD_MEDIA,
1389                         NULL, 0, NULL, 0, &lpBytesReturned, NULL);
1390     }
1391 }
1392
1393 static int raw_set_locked(BlockDriverState *bs, int locked)
1394 {
1395     return -ENOTSUP;
1396 }
1397 #endif
1398
1399 BlockDriver bdrv_host_device = {
1400     "host_device",
1401     sizeof(BDRVRawState),
1402     NULL, /* no probe for protocols */
1403     hdev_open,
1404     NULL,
1405     NULL,
1406     raw_close,
1407     NULL,
1408     raw_flush,
1409
1410 #if 0
1411     .bdrv_aio_read = raw_aio_read,
1412     .bdrv_aio_write = raw_aio_write,
1413     .bdrv_aio_cancel = raw_aio_cancel,
1414     .aiocb_size = sizeof(RawAIOCB);
1415 #endif
1416     .bdrv_pread = raw_pread,
1417     .bdrv_pwrite = raw_pwrite,
1418     .bdrv_getlength = raw_getlength,
1419 };
1420 #endif /* _WIN32 */