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 #include <sys/dkio.h>
  48 #endif
  49
  50 typedef struct BDRVRawState {
  51     int fd;
  52 } BDRVRawState;
  53
  54 #ifdef CONFIG_COCOA
  55 static kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator );
  56 static kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize );
  57
  58 kern_return_t FindEjectableCDMedia( io_iterator_t *mediaIterator )
  59 {
  60     kern_return_t       kernResult;
  61     mach_port_t     masterPort;
  62     CFMutableDictionaryRef  classesToMatch;
  63
  64     kernResult = IOMasterPort( MACH_PORT_NULL, &masterPort );
  65     if ( KERN_SUCCESS != kernResult ) {
  66         printf( "IOMasterPort returned %d\n", kernResult );
  67     }
  68
  69     classesToMatch = IOServiceMatching( kIOCDMediaClass );
  70     if ( classesToMatch == NULL ) {
  71         printf( "IOServiceMatching returned a NULL dictionary.\n" );
  72     } else {
  73     CFDictionarySetValue( classesToMatch, CFSTR( kIOMediaEjectableKey ), kCFBooleanTrue );
  74     }
  75     kernResult = IOServiceGetMatchingServices( masterPort, classesToMatch, mediaIterator );
  76     if ( KERN_SUCCESS != kernResult )
  77     {
  78         printf( "IOServiceGetMatchingServices returned %d\n", kernResult );
  79     }
  80
  81     return kernResult;
  82 }
  83
  84 kern_return_t GetBSDPath( io_iterator_t mediaIterator, char *bsdPath, CFIndex maxPathSize )
  85 {
  86     io_object_t     nextMedia;
  87     kern_return_t   kernResult = KERN_FAILURE;
  88     *bsdPath = '\0';
  89     nextMedia = IOIteratorNext( mediaIterator );
  90     if ( nextMedia )
  91     {
  92         CFTypeRef   bsdPathAsCFString;
  93     bsdPathAsCFString = IORegistryEntryCreateCFProperty( nextMedia, CFSTR( kIOBSDNameKey ), kCFAllocatorDefault, 0 );
  94         if ( bsdPathAsCFString ) {
  95             size_t devPathLength;
  96             strcpy( bsdPath, _PATH_DEV );
  97             strcat( bsdPath, "r" );
  98             devPathLength = strlen( bsdPath );
  99             if ( CFStringGetCString( bsdPathAsCFString, bsdPath + devPathLength, maxPathSize - devPathLength, kCFStringEncodingASCII ) ) {
 100                 kernResult = KERN_SUCCESS;
 101             }
 102             CFRelease( bsdPathAsCFString );
 103         }
 104         IOObjectRelease( nextMedia );
 105     }
 106
 107     return kernResult;
 108 }
 109
 110 #endif
 111
 112 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 113 {
 114     BDRVRawState *s = bs->opaque;
 115     int fd, open_flags;
 116
 117 #ifdef CONFIG_COCOA
 118     if (strstart(filename, "/dev/cdrom", NULL)) {
 119         kern_return_t kernResult;
 120         io_iterator_t mediaIterator;
 121         char bsdPath[ MAXPATHLEN ];
 122         int fd;
 123
 124         kernResult = FindEjectableCDMedia( &mediaIterator );
 125         kernResult = GetBSDPath( mediaIterator, bsdPath, sizeof( bsdPath ) );
 126
 127         if ( bsdPath[ 0 ] != '\0' ) {
 128             strcat(bsdPath,"s0");
 129             /* some CDs don't have a partition 0 */
 130             fd = open(bsdPath, O_RDONLY | O_BINARY | O_LARGEFILE);
 131             if (fd < 0) {
 132                 bsdPath[strlen(bsdPath)-1] = '1';
 133             } else {
 134                 close(fd);
 135             }
 136             filename = bsdPath;
 137         }
 138
 139         if ( mediaIterator )
 140             IOObjectRelease( mediaIterator );
 141     }
 142 #endif
 143     open_flags = O_BINARY;
 144     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 145         open_flags |= O_RDWR;
 146     } else {
 147         open_flags |= O_RDONLY;
 148         bs->read_only = 1;
 149     }
 150     if (flags & BDRV_O_CREAT)
 151         open_flags |= O_CREAT | O_TRUNC;
 152
 153     fd = open(filename, open_flags, 0644);
 154     if (fd < 0)
 155         return -errno;
 156     s->fd = fd;
 157     return 0;
 158 }
 159
 160 /* XXX: use host sector size if necessary with:
 161 #ifdef DIOCGSECTORSIZE
 162         {
 163             unsigned int sectorsize = 512;
 164             if (!ioctl(fd, DIOCGSECTORSIZE, &sectorsize) &&
 165                 sectorsize > bufsize)
 166                 bufsize = sectorsize;
 167         }
 168 #endif
 169 #ifdef CONFIG_COCOA
 170         u_int32_t   blockSize = 512;
 171         if ( !ioctl( fd, DKIOCGETBLOCKSIZE, &blockSize ) && blockSize > bufsize) {
 172             bufsize = blockSize;
 173         }
 174 #endif
 175 */
 176
 177 static int raw_pread(BlockDriverState *bs, int64_t offset,
 178                      uint8_t *buf, int count)
 179 {
 180     BDRVRawState *s = bs->opaque;
 181     int ret;
 182
 183     lseek(s->fd, offset, SEEK_SET);
 184     ret = read(s->fd, buf, count);
 185     return ret;
 186 }
 187
 188 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 189                       const uint8_t *buf, int count)
 190 {
 191     BDRVRawState *s = bs->opaque;
 192     int ret;
 193
 194     lseek(s->fd, offset, SEEK_SET);
 195     ret = write(s->fd, buf, count);
 196     return ret;
 197 }
 198
 199 /***********************************************************/
 200 /* Unix AOP using POSIX AIO */
 201
 202 typedef struct RawAIOCB {
 203     struct aiocb aiocb;
 204     int busy; /* only used for debugging */
 205     BlockDriverAIOCB *next;
 206 } RawAIOCB;
 207
 208 static int aio_sig_num = SIGUSR2;
 209 static BlockDriverAIOCB *first_aio; /* AIO issued */
 210 static int aio_initialized = 0;
 211
 212 static void aio_signal_handler(int signum)
 213 {
 214 #ifndef QEMU_TOOL
 215     CPUState *env = cpu_single_env;
 216     if (env) {
 217         /* stop the currently executing cpu because a timer occured */
 218         cpu_interrupt(env, CPU_INTERRUPT_EXIT);
 219 #ifdef USE_KQEMU
 220         if (env->kqemu_enabled) {
 221             kqemu_cpu_interrupt(env);
 222         }
 223 #endif
 224     }
 225 #endif
 226 }
 227
 228 void qemu_aio_init(void)
 229 {
 230     struct sigaction act;
 231
 232     aio_initialized = 1;
 233
 234     sigfillset(&act.sa_mask);
 235     act.sa_flags = 0; /* do not restart syscalls to interrupt select() */
 236     act.sa_handler = aio_signal_handler;
 237     sigaction(aio_sig_num, &act, NULL);
 238
 239     {
 240         /* XXX: aio thread exit seems to hang on RH 9 */
 241         struct aioinit ai;
 242         memset(&ai, 0, sizeof(ai));
 243         ai.aio_threads = 2;
 244         ai.aio_num = 1;
 245         ai.aio_idle_time = 365 * 100000;
 246         aio_init(&ai);
 247     }
 248 }
 249
 250 void qemu_aio_poll(void)
 251 {
 252     BlockDriverAIOCB *acb, **pacb;
 253     RawAIOCB *acb1;
 254     int ret;
 255
 256     for(;;) {
 257         pacb = &first_aio;
 258         for(;;) {
 259             acb = *pacb;
 260             if (!acb)
 261                 goto the_end;
 262             acb1 = acb->opaque;
 263             ret = aio_error(&acb1->aiocb);
 264             if (ret == ECANCELED) {
 265                 /* remove the request */
 266                 acb1->busy = 0;
 267                 *pacb = acb1->next;
 268             } else if (ret != EINPROGRESS) {
 269                 /* end of aio */
 270                 if (ret == 0) {
 271                     ret = aio_return(&acb1->aiocb);
 272                     if (ret == acb1->aiocb.aio_nbytes)
 273                         ret = 0;
 274                     else
 275                         ret = -1;
 276                 } else {
 277                     ret = -ret;
 278                 }
 279                 /* remove the request */
 280                 acb1->busy = 0;
 281                 *pacb = acb1->next;
 282                 /* call the callback */
 283                 acb->cb(acb->cb_opaque, ret);
 284                 break;
 285             } else {
 286                 pacb = &acb1->next;
 287             }
 288         }
 289     }
 290  the_end: ;
 291 }
 292
 293 /* wait until at least one AIO was handled */
 294 static sigset_t wait_oset;
 295
 296 void qemu_aio_wait_start(void)
 297 {
 298     sigset_t set;
 299
 300     if (!aio_initialized)
 301         qemu_aio_init();
 302     sigemptyset(&set);
 303     sigaddset(&set, aio_sig_num);
 304     sigprocmask(SIG_BLOCK, &set, &wait_oset);
 305 }
 306
 307 void qemu_aio_wait(void)
 308 {
 309     sigset_t set;
 310     int nb_sigs;
 311     sigemptyset(&set);
 312     sigaddset(&set, aio_sig_num);
 313     sigwait(&set, &nb_sigs);
 314     qemu_aio_poll();
 315 }
 316
 317 void qemu_aio_wait_end(void)
 318 {
 319     sigprocmask(SIG_SETMASK, &wait_oset, NULL);
 320 }
 321
 322 static int raw_aio_new(BlockDriverAIOCB *acb)
 323 {
 324     RawAIOCB *acb1;
 325     BDRVRawState *s = acb->bs->opaque;
 326
 327     acb1 = qemu_mallocz(sizeof(RawAIOCB));
 328     if (!acb1)
 329         return -1;
 330     acb->opaque = acb1;
 331     acb1->aiocb.aio_fildes = s->fd;
 332     acb1->aiocb.aio_sigevent.sigev_signo = aio_sig_num;
 333     acb1->aiocb.aio_sigevent.sigev_notify = SIGEV_SIGNAL;
 334     return 0;
 335 }
 336
 337 static int raw_aio_read(BlockDriverAIOCB *acb, int64_t sector_num,
 338                         uint8_t *buf, int nb_sectors)
 339 {
 340     RawAIOCB *acb1 = acb->opaque;
 341
 342     assert(acb1->busy == 0);
 343     acb1->busy = 1;
 344     acb1->aiocb.aio_buf = buf;
 345     acb1->aiocb.aio_nbytes = nb_sectors * 512;
 346     acb1->aiocb.aio_offset = sector_num * 512;
 347     acb1->next = first_aio;
 348     first_aio = acb;
 349     if (aio_read(&acb1->aiocb) < 0) {
 350         acb1->busy = 0;
 351         return -errno;
 352     }
 353     return 0;
 354 }
 355
 356 static int raw_aio_write(BlockDriverAIOCB *acb, int64_t sector_num,
 357                          const uint8_t *buf, int nb_sectors)
 358 {
 359     RawAIOCB *acb1 = acb->opaque;
 360
 361     assert(acb1->busy == 0);
 362     acb1->busy = 1;
 363     acb1->aiocb.aio_buf = (uint8_t *)buf;
 364     acb1->aiocb.aio_nbytes = nb_sectors * 512;
 365     acb1->aiocb.aio_offset = sector_num * 512;
 366     acb1->next = first_aio;
 367     first_aio = acb;
 368     if (aio_write(&acb1->aiocb) < 0) {
 369         acb1->busy = 0;
 370         return -errno;
 371     }
 372     return 0;
 373 }
 374
 375 static void raw_aio_cancel(BlockDriverAIOCB *acb)
 376 {
 377     RawAIOCB *acb1 = acb->opaque;
 378     int ret;
 379     BlockDriverAIOCB **pacb;
 380
 381     ret = aio_cancel(acb1->aiocb.aio_fildes, &acb1->aiocb);
 382     if (ret == AIO_NOTCANCELED) {
 383         /* fail safe: if the aio could not be canceled, we wait for
 384            it */
 385         while (aio_error(&acb1->aiocb) == EINPROGRESS);
 386     }
 387
 388     /* remove the callback from the queue */
 389     pacb = &first_aio;
 390     for(;;) {
 391         if (*pacb == NULL) {
 392             break;
 393         } else if (*pacb == acb) {
 394             acb1->busy = 0;
 395             *pacb = acb1->next;
 396             break;
 397         }
 398         acb1 = (*pacb)->opaque;
 399         pacb = &acb1->next;
 400     }
 401 }
 402
 403 static void raw_aio_delete(BlockDriverAIOCB *acb)
 404 {
 405     RawAIOCB *acb1 = acb->opaque;
 406     raw_aio_cancel(acb);
 407     qemu_free(acb1);
 408 }
 409
 410 static void raw_close(BlockDriverState *bs)
 411 {
 412     BDRVRawState *s = bs->opaque;
 413     close(s->fd);
 414 }
 415
 416 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 417 {
 418     BDRVRawState *s = bs->opaque;
 419     if (ftruncate(s->fd, offset) < 0)
 420         return -errno;
 421     return 0;
 422 }
 423
 424 static int64_t  raw_getlength(BlockDriverState *bs)
 425 {
 426     BDRVRawState *s = bs->opaque;
 427     int fd = s->fd;
 428     int64_t size;
 429 #ifdef _BSD
 430     struct stat sb;
 431 #endif
 432 #ifdef __sun__
 433     struct dk_minfo minfo;
 434     int rv;
 435 #endif
 436
 437 #ifdef _BSD
 438     if (!fstat(fd, &sb) && (S_IFCHR & sb.st_mode)) {
 439 #ifdef DIOCGMEDIASIZE
 440         if (ioctl(fd, DIOCGMEDIASIZE, (off_t *)&size))
 441 #endif
 442 #ifdef CONFIG_COCOA
 443         size = LONG_LONG_MAX;
 444 #else
 445         size = lseek(fd, 0LL, SEEK_END);
 446 #endif
 447     } else
 448 #endif
 449 #ifdef __sun__
 450     /*
 451      * use the DKIOCGMEDIAINFO ioctl to read the size.
 452      */
 453     rv = ioctl ( fd, DKIOCGMEDIAINFO, &minfo );
 454     if ( rv != -1 ) {
 455         size = minfo.dki_lbsize * minfo.dki_capacity;
 456     } else /* there are reports that lseek on some devices
 457               fails, but irc discussion said that contingency
 458               on contingency was overkill */
 459 #endif
 460     {
 461         size = lseek(fd, 0, SEEK_END);
 462     }
 463 #ifdef _WIN32
 464     /* On Windows hosts it can happen that we're unable to get file size
 465        for CD-ROM raw device (it's inherent limitation of the CDFS driver). */
 466     if (size == -1)
 467         size = LONG_LONG_MAX;
 468 #endif
 469     return size;
 470 }
 471
 472 static int raw_create(const char *filename, int64_t total_size,
 473                       const char *backing_file, int flags)
 474 {
 475     int fd;
 476
 477     if (flags || backing_file)
 478         return -ENOTSUP;
 479
 480     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 481               0644);
 482     if (fd < 0)
 483         return -EIO;
 484     ftruncate(fd, total_size * 512);
 485     close(fd);
 486     return 0;
 487 }
 488
 489 static void raw_flush(BlockDriverState *bs)
 490 {
 491     BDRVRawState *s = bs->opaque;
 492     fsync(s->fd);
 493 }
 494
 495 BlockDriver bdrv_raw = {
 496     "raw",
 497     sizeof(BDRVRawState),
 498     NULL, /* no probe for protocols */
 499     raw_open,
 500     NULL,
 501     NULL,
 502     raw_close,
 503     raw_create,
 504     raw_flush,
 505
 506     .bdrv_aio_new = raw_aio_new,
 507     .bdrv_aio_read = raw_aio_read,
 508     .bdrv_aio_write = raw_aio_write,
 509     .bdrv_aio_cancel = raw_aio_cancel,
 510     .bdrv_aio_delete = raw_aio_delete,
 511     .protocol_name = "file",
 512     .bdrv_pread = raw_pread,
 513     .bdrv_pwrite = raw_pwrite,
 514     .bdrv_truncate = raw_truncate,
 515     .bdrv_getlength = raw_getlength,
 516 };
 517
 518 #else /* _WIN32 */
 519
 520 /* XXX: use another file ? */
 521 #include <winioctl.h>
 522
 523 typedef struct BDRVRawState {
 524     HANDLE hfile;
 525 } BDRVRawState;
 526
 527 typedef struct RawAIOCB {
 528     HANDLE hEvent;
 529     OVERLAPPED ov;
 530     int count;
 531 } RawAIOCB;
 532
 533 int qemu_ftruncate64(int fd, int64_t length)
 534 {
 535     LARGE_INTEGER li;
 536     LONG high;
 537     HANDLE h;
 538     BOOL res;
 539
 540     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 541         return -1;
 542
 543     h = (HANDLE)_get_osfhandle(fd);
 544
 545     /* get current position, ftruncate do not change position */
 546     li.HighPart = 0;
 547     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
 548     if (li.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 549         return -1;
 550
 551     high = length >> 32;
 552     if (!SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN))
 553         return -1;
 554     res = SetEndOfFile(h);
 555
 556     /* back to old position */
 557     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
 558     return res ? 0 : -1;
 559 }
 560
 561 static int set_sparse(int fd)
 562 {
 563     DWORD returned;
 564     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 565                                  NULL, 0, NULL, 0, &returned, NULL);
 566 }
 567
 568 static int raw_open(BlockDriverState *bs, const char *filename, int flags)
 569 {
 570     BDRVRawState *s = bs->opaque;
 571     int access_flags, create_flags;
 572
 573     if ((flags & BDRV_O_ACCESS) == O_RDWR) {
 574         access_flags = GENERIC_READ | GENERIC_WRITE;
 575     } else {
 576         access_flags = GENERIC_READ;
 577     }
 578     if (flags & BDRV_O_CREAT) {
 579         create_flags = CREATE_ALWAYS;
 580     } else {
 581         create_flags = OPEN_EXISTING;
 582     }
 583     s->hfile = CreateFile(filename, access_flags,
 584                           FILE_SHARE_READ, NULL,
 585                           create_flags, FILE_FLAG_OVERLAPPED, 0);
 586     if (s->hfile == INVALID_HANDLE_VALUE)
 587         return -1;
 588     return 0;
 589 }
 590
 591 static int raw_pread(BlockDriverState *bs, int64_t offset,
 592                      uint8_t *buf, int count)
 593 {
 594     BDRVRawState *s = bs->opaque;
 595     OVERLAPPED ov;
 596     DWORD ret_count;
 597     int ret;
 598
 599     memset(&ov, 0, sizeof(ov));
 600     ov.Offset = offset;
 601     ov.OffsetHigh = offset >> 32;
 602     ret = ReadFile(s->hfile, buf, count, &ret_count, &ov);
 603     if (!ret) {
 604         ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
 605         if (!ret)
 606             return -EIO;
 607         else
 608             return ret_count;
 609     }
 610     return ret_count;
 611 }
 612
 613 static int raw_pwrite(BlockDriverState *bs, int64_t offset,
 614                       const uint8_t *buf, int count)
 615 {
 616     BDRVRawState *s = bs->opaque;
 617     OVERLAPPED ov;
 618     DWORD ret_count;
 619     int ret;
 620
 621     memset(&ov, 0, sizeof(ov));
 622     ov.Offset = offset;
 623     ov.OffsetHigh = offset >> 32;
 624     ret = WriteFile(s->hfile, buf, count, &ret_count, &ov);
 625     if (!ret) {
 626         ret = GetOverlappedResult(s->hfile, &ov, &ret_count, TRUE);
 627         if (!ret)
 628             return -EIO;
 629         else
 630             return ret_count;
 631     }
 632     return ret_count;
 633 }
 634
 635 static int raw_aio_new(BlockDriverAIOCB *acb)
 636 {
 637     RawAIOCB *acb1;
 638
 639     acb1 = qemu_mallocz(sizeof(RawAIOCB));
 640     if (!acb1)
 641         return -ENOMEM;
 642     acb->opaque = acb1;
 643     acb1->hEvent = CreateEvent(NULL, TRUE, FALSE, NULL);
 644     if (!acb1->hEvent)
 645         return -ENOMEM;
 646     return 0;
 647 }
 648 #ifndef QEMU_TOOL
 649 static void raw_aio_cb(void *opaque)
 650 {
 651     BlockDriverAIOCB *acb = opaque;
 652     BlockDriverState *bs = acb->bs;
 653     BDRVRawState *s = bs->opaque;
 654     RawAIOCB *acb1 = acb->opaque;
 655     DWORD ret_count;
 656     int ret;
 657
 658     ret = GetOverlappedResult(s->hfile, &acb1->ov, &ret_count, TRUE);
 659     if (!ret || ret_count != acb1->count) {
 660         acb->cb(acb->cb_opaque, -EIO);
 661     } else {
 662         acb->cb(acb->cb_opaque, 0);
 663     }
 664 }
 665 #endif
 666 static int raw_aio_read(BlockDriverAIOCB *acb, int64_t sector_num,
 667                         uint8_t *buf, int nb_sectors)
 668 {
 669     BlockDriverState *bs = acb->bs;
 670     BDRVRawState *s = bs->opaque;
 671     RawAIOCB *acb1 = acb->opaque;
 672     int ret;
 673     int64_t offset;
 674
 675     memset(&acb1->ov, 0, sizeof(acb1->ov));
 676     offset = sector_num * 512;
 677     acb1->ov.Offset = offset;
 678     acb1->ov.OffsetHigh = offset >> 32;
 679     acb1->ov.hEvent = acb1->hEvent;
 680     acb1->count = nb_sectors * 512;
 681 #ifndef QEMU_TOOL
 682     qemu_add_wait_object(acb1->ov.hEvent, raw_aio_cb, acb);
 683 #endif
 684     ret = ReadFile(s->hfile, buf, acb1->count, NULL, &acb1->ov);
 685     if (!ret)
 686         return -EIO;
 687     return 0;
 688 }
 689
 690 static int raw_aio_write(BlockDriverAIOCB *acb, int64_t sector_num,
 691                          uint8_t *buf, int nb_sectors)
 692 {
 693     BlockDriverState *bs = acb->bs;
 694     BDRVRawState *s = bs->opaque;
 695     RawAIOCB *acb1 = acb->opaque;
 696     int ret;
 697     int64_t offset;
 698
 699     memset(&acb1->ov, 0, sizeof(acb1->ov));
 700     offset = sector_num * 512;
 701     acb1->ov.Offset = offset;
 702     acb1->ov.OffsetHigh = offset >> 32;
 703     acb1->ov.hEvent = acb1->hEvent;
 704     acb1->count = nb_sectors * 512;
 705 #ifndef QEMU_TOOL
 706     qemu_add_wait_object(acb1->ov.hEvent, raw_aio_cb, acb);
 707 #endif
 708     ret = ReadFile(s->hfile, buf, acb1->count, NULL, &acb1->ov);
 709     if (!ret)
 710         return -EIO;
 711     return 0;
 712 }
 713
 714 static void raw_aio_cancel(BlockDriverAIOCB *acb)
 715 {
 716     BlockDriverState *bs = acb->bs;
 717     BDRVRawState *s = bs->opaque;
 718 #ifndef QEMU_TOOL
 719     RawAIOCB *acb1 = acb->opaque;
 720
 721     qemu_del_wait_object(acb1->ov.hEvent, raw_aio_cb, acb);
 722 #endif
 723     /* XXX: if more than one async I/O it is not correct */
 724     CancelIo(s->hfile);
 725 }
 726
 727 static void raw_aio_delete(BlockDriverAIOCB *acb)
 728 {
 729     RawAIOCB *acb1 = acb->opaque;
 730     raw_aio_cancel(acb);
 731     CloseHandle(acb1->hEvent);
 732     qemu_free(acb1);
 733 }
 734
 735 static void raw_flush(BlockDriverState *bs)
 736 {
 737     /* XXX: add it */
 738 }
 739
 740 static void raw_close(BlockDriverState *bs)
 741 {
 742     BDRVRawState *s = bs->opaque;
 743     CloseHandle(s->hfile);
 744 }
 745
 746 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 747 {
 748     BDRVRawState *s = bs->opaque;
 749     DWORD low, high;
 750
 751     low = offset;
 752     high = offset >> 32;
 753     if (!SetFilePointer(s->hfile, low, &high, FILE_BEGIN))
 754         return -EIO;
 755     if (!SetEndOfFile(s->hfile))
 756         return -EIO;
 757     return 0;
 758 }
 759
 760 static int64_t  raw_getlength(BlockDriverState *bs)
 761 {
 762     BDRVRawState *s = bs->opaque;
 763     LARGE_INTEGER l;
 764
 765     l.LowPart = GetFileSize(s->hfile, &l.HighPart);
 766     if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 767         return -EIO;
 768     return l.QuadPart;
 769 }
 770
 771 static int raw_create(const char *filename, int64_t total_size,
 772                       const char *backing_file, int flags)
 773 {
 774     int fd;
 775
 776     if (flags || backing_file)
 777         return -ENOTSUP;
 778
 779     fd = open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 780               0644);
 781     if (fd < 0)
 782         return -EIO;
 783     set_sparse(fd);
 784     ftruncate(fd, total_size * 512);
 785     close(fd);
 786     return 0;
 787 }
 788
 789 void qemu_aio_init(void)
 790 {
 791 }
 792
 793 void qemu_aio_poll(void)
 794 {
 795 }
 796
 797 void qemu_aio_wait_start(void)
 798 {
 799 }
 800
 801 void qemu_aio_wait(void)
 802 {
 803 }
 804
 805 void qemu_aio_wait_end(void)
 806 {
 807 }
 808
 809 BlockDriver bdrv_raw = {
 810     "raw",
 811     sizeof(BDRVRawState),
 812     NULL, /* no probe for protocols */
 813     raw_open,
 814     NULL,
 815     NULL,
 816     raw_close,
 817     raw_create,
 818     raw_flush,
 819
 820 #if 0
 821     .bdrv_aio_new = raw_aio_new,
 822     .bdrv_aio_read = raw_aio_read,
 823     .bdrv_aio_write = raw_aio_write,
 824     .bdrv_aio_cancel = raw_aio_cancel,
 825     .bdrv_aio_delete = raw_aio_delete,
 826 #endif
 827     .protocol_name = "file",
 828     .bdrv_pread = raw_pread,
 829     .bdrv_pwrite = raw_pwrite,
 830     .bdrv_truncate = raw_truncate,
 831     .bdrv_getlength = raw_getlength,
 832 };
 833 #endif /* _WIN32 */