block/raw-win32.c

   1 /*
   2  * Block driver for RAW files (win32)
   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 "block/block_int.h"
  27 #include "qemu/module.h"
  28 #include "raw-aio.h"
  29 #include "trace.h"
  30 #include "block/thread-pool.h"
  31 #include "qemu/iov.h"
  32 #include <windows.h>
  33 #include <winioctl.h>
  34
  35 #define FTYPE_FILE 0
  36 #define FTYPE_CD     1
  37 #define FTYPE_HARDDISK 2
  38
  39 static QEMUWin32AIOState *aio;
  40
  41 typedef struct RawWin32AIOData {
  42     BlockDriverState *bs;
  43     HANDLE hfile;
  44     struct iovec *aio_iov;
  45     int aio_niov;
  46     size_t aio_nbytes;
  47     off64_t aio_offset;
  48     int aio_type;
  49 } RawWin32AIOData;
  50
  51 typedef struct BDRVRawState {
  52     HANDLE hfile;
  53     int type;
  54     char drive_path[16]; /* format: "d:\" */
  55     QEMUWin32AIOState *aio;
  56 } BDRVRawState;
  57
  58 /*
  59  * Read/writes the data to/from a given linear buffer.
  60  *
  61  * Returns the number of bytes handles or -errno in case of an error. Short
  62  * reads are only returned if the end of the file is reached.
  63  */
  64 static size_t handle_aiocb_rw(RawWin32AIOData *aiocb)
  65 {
  66     size_t offset = 0;
  67     int i;
  68
  69     for (i = 0; i < aiocb->aio_niov; i++) {
  70         OVERLAPPED ov;
  71         DWORD ret, ret_count, len;
  72
  73         memset(&ov, 0, sizeof(ov));
  74         ov.Offset = (aiocb->aio_offset + offset);
  75         ov.OffsetHigh = (aiocb->aio_offset + offset) >> 32;
  76         len = aiocb->aio_iov[i].iov_len;
  77         if (aiocb->aio_type & QEMU_AIO_WRITE) {
  78             ret = WriteFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  79                             len, &ret_count, &ov);
  80         } else {
  81             ret = ReadFile(aiocb->hfile, aiocb->aio_iov[i].iov_base,
  82                            len, &ret_count, &ov);
  83         }
  84         if (!ret) {
  85             ret_count = 0;
  86         }
  87         if (ret_count != len) {
  88             offset += ret_count;
  89             break;
  90         }
  91         offset += len;
  92     }
  93
  94     return offset;
  95 }
  96
  97 static int aio_worker(void *arg)
  98 {
  99     RawWin32AIOData *aiocb = arg;
 100     ssize_t ret = 0;
 101     size_t count;
 102
 103     switch (aiocb->aio_type & QEMU_AIO_TYPE_MASK) {
 104     case QEMU_AIO_READ:
 105         count = handle_aiocb_rw(aiocb);
 106         if (count < aiocb->aio_nbytes && aiocb->bs->growable) {
 107             /* A short read means that we have reached EOF. Pad the buffer
 108              * with zeros for bytes after EOF. */
 109             iov_memset(aiocb->aio_iov, aiocb->aio_niov, count,
 110                       0, aiocb->aio_nbytes - count);
 111
 112             count = aiocb->aio_nbytes;
 113         }
 114         if (count == aiocb->aio_nbytes) {
 115             ret = 0;
 116         } else {
 117             ret = -EINVAL;
 118         }
 119         break;
 120     case QEMU_AIO_WRITE:
 121         count = handle_aiocb_rw(aiocb);
 122         if (count == aiocb->aio_nbytes) {
 123             count = 0;
 124         } else {
 125             count = -EINVAL;
 126         }
 127         break;
 128     case QEMU_AIO_FLUSH:
 129         if (!FlushFileBuffers(aiocb->hfile)) {
 130             return -EIO;
 131         }
 132         break;
 133     default:
 134         fprintf(stderr, "invalid aio request (0x%x)\n", aiocb->aio_type);
 135         ret = -EINVAL;
 136         break;
 137     }
 138
 139     g_slice_free(RawWin32AIOData, aiocb);
 140     return ret;
 141 }
 142
 143 static BlockDriverAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
 144         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 145         BlockDriverCompletionFunc *cb, void *opaque, int type)
 146 {
 147     RawWin32AIOData *acb = g_slice_new(RawWin32AIOData);
 148     ThreadPool *pool;
 149
 150     acb->bs = bs;
 151     acb->hfile = hfile;
 152     acb->aio_type = type;
 153
 154     if (qiov) {
 155         acb->aio_iov = qiov->iov;
 156         acb->aio_niov = qiov->niov;
 157     }
 158     acb->aio_nbytes = nb_sectors * 512;
 159     acb->aio_offset = sector_num * 512;
 160
 161     trace_paio_submit(acb, opaque, sector_num, nb_sectors, type);
 162     pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
 163     return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
 164 }
 165
 166 int qemu_ftruncate64(int fd, int64_t length)
 167 {
 168     LARGE_INTEGER li;
 169     DWORD dw;
 170     LONG high;
 171     HANDLE h;
 172     BOOL res;
 173
 174     if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 175         return -1;
 176
 177     h = (HANDLE)_get_osfhandle(fd);
 178
 179     /* get current position, ftruncate do not change position */
 180     li.HighPart = 0;
 181     li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
 182     if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 183         return -1;
 184     }
 185
 186     high = length >> 32;
 187     dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
 188     if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 189         return -1;
 190     }
 191     res = SetEndOfFile(h);
 192
 193     /* back to old position */
 194     SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
 195     return res ? 0 : -1;
 196 }
 197
 198 static int set_sparse(int fd)
 199 {
 200     DWORD returned;
 201     return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 202                                  NULL, 0, NULL, 0, &returned, NULL);
 203 }
 204
 205 static void raw_probe_alignment(BlockDriverState *bs)
 206 {
 207     BDRVRawState *s = bs->opaque;
 208     DWORD sectorsPerCluster, freeClusters, totalClusters, count;
 209     DISK_GEOMETRY_EX dg;
 210     BOOL status;
 211
 212     if (s->type == FTYPE_CD) {
 213         bs->request_alignment = 2048;
 214         return;
 215     }
 216     if (s->type == FTYPE_HARDDISK) {
 217         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 218                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 219         if (status != 0) {
 220             bs->request_alignment = dg.Geometry.BytesPerSector;
 221             return;
 222         }
 223         /* try GetDiskFreeSpace too */
 224     }
 225
 226     if (s->drive_path[0]) {
 227         GetDiskFreeSpace(s->drive_path, &sectorsPerCluster,
 228                          &dg.Geometry.BytesPerSector,
 229                          &freeClusters, &totalClusters);
 230         bs->request_alignment = dg.Geometry.BytesPerSector;
 231     }
 232 }
 233
 234 static void raw_parse_flags(int flags, int *access_flags, DWORD *overlapped)
 235 {
 236     assert(access_flags != NULL);
 237     assert(overlapped != NULL);
 238
 239     if (flags & BDRV_O_RDWR) {
 240         *access_flags = GENERIC_READ | GENERIC_WRITE;
 241     } else {
 242         *access_flags = GENERIC_READ;
 243     }
 244
 245     *overlapped = FILE_ATTRIBUTE_NORMAL;
 246     if (flags & BDRV_O_NATIVE_AIO) {
 247         *overlapped |= FILE_FLAG_OVERLAPPED;
 248     }
 249     if (flags & BDRV_O_NOCACHE) {
 250         *overlapped |= FILE_FLAG_NO_BUFFERING;
 251     }
 252 }
 253
 254 static void raw_parse_filename(const char *filename, QDict *options,
 255                                Error **errp)
 256 {
 257     /* The filename does not have to be prefixed by the protocol name, since
 258      * "file" is the default protocol; therefore, the return value of this
 259      * function call can be ignored. */
 260     strstart(filename, "file:", &filename);
 261
 262     qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
 263 }
 264
 265 static QemuOptsList raw_runtime_opts = {
 266     .name = "raw",
 267     .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
 268     .desc = {
 269         {
 270             .name = "filename",
 271             .type = QEMU_OPT_STRING,
 272             .help = "File name of the image",
 273         },
 274         { /* end of list */ }
 275     },
 276 };
 277
 278 static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 279                     Error **errp)
 280 {
 281     BDRVRawState *s = bs->opaque;
 282     int access_flags;
 283     DWORD overlapped;
 284     QemuOpts *opts;
 285     Error *local_err = NULL;
 286     const char *filename;
 287     int ret;
 288
 289     s->type = FTYPE_FILE;
 290
 291     opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
 292     qemu_opts_absorb_qdict(opts, options, &local_err);
 293     if (local_err) {
 294         error_propagate(errp, local_err);
 295         ret = -EINVAL;
 296         goto fail;
 297     }
 298
 299     filename = qemu_opt_get(opts, "filename");
 300
 301     raw_parse_flags(flags, &access_flags, &overlapped);
 302
 303     if ((flags & BDRV_O_NATIVE_AIO) && aio == NULL) {
 304         aio = win32_aio_init();
 305         if (aio == NULL) {
 306             error_setg(errp, "Could not initialize AIO");
 307             ret = -EINVAL;
 308             goto fail;
 309         }
 310     }
 311
 312     if (filename[0] && filename[1] == ':') {
 313         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]);
 314     } else if (filename[0] == '\\' && filename[1] == '\\') {
 315         s->drive_path[0] = 0;
 316     } else {
 317         /* Relative path.  */
 318         char buf[MAX_PATH];
 319         GetCurrentDirectory(MAX_PATH, buf);
 320         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]);
 321     }
 322
 323     s->hfile = CreateFile(filename, access_flags,
 324                           FILE_SHARE_READ, NULL,
 325                           OPEN_EXISTING, overlapped, NULL);
 326     if (s->hfile == INVALID_HANDLE_VALUE) {
 327         int err = GetLastError();
 328
 329         if (err == ERROR_ACCESS_DENIED) {
 330             ret = -EACCES;
 331         } else {
 332             ret = -EINVAL;
 333         }
 334         goto fail;
 335     }
 336
 337     if (flags & BDRV_O_NATIVE_AIO) {
 338         ret = win32_aio_attach(aio, s->hfile);
 339         if (ret < 0) {
 340             CloseHandle(s->hfile);
 341             error_setg_errno(errp, -ret, "Could not enable AIO");
 342             goto fail;
 343         }
 344         s->aio = aio;
 345     }
 346
 347     raw_probe_alignment(bs);
 348     ret = 0;
 349 fail:
 350     qemu_opts_del(opts);
 351     return ret;
 352 }
 353
 354 static BlockDriverAIOCB *raw_aio_readv(BlockDriverState *bs,
 355                          int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 356                          BlockDriverCompletionFunc *cb, void *opaque)
 357 {
 358     BDRVRawState *s = bs->opaque;
 359     if (s->aio) {
 360         return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
 361                                 nb_sectors, cb, opaque, QEMU_AIO_READ);
 362     } else {
 363         return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
 364                            cb, opaque, QEMU_AIO_READ);
 365     }
 366 }
 367
 368 static BlockDriverAIOCB *raw_aio_writev(BlockDriverState *bs,
 369                           int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 370                           BlockDriverCompletionFunc *cb, void *opaque)
 371 {
 372     BDRVRawState *s = bs->opaque;
 373     if (s->aio) {
 374         return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
 375                                 nb_sectors, cb, opaque, QEMU_AIO_WRITE);
 376     } else {
 377         return paio_submit(bs, s->hfile, sector_num, qiov, nb_sectors,
 378                            cb, opaque, QEMU_AIO_WRITE);
 379     }
 380 }
 381
 382 static BlockDriverAIOCB *raw_aio_flush(BlockDriverState *bs,
 383                          BlockDriverCompletionFunc *cb, void *opaque)
 384 {
 385     BDRVRawState *s = bs->opaque;
 386     return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 387 }
 388
 389 static void raw_close(BlockDriverState *bs)
 390 {
 391     BDRVRawState *s = bs->opaque;
 392     CloseHandle(s->hfile);
 393 }
 394
 395 static int raw_truncate(BlockDriverState *bs, int64_t offset)
 396 {
 397     BDRVRawState *s = bs->opaque;
 398     LONG low, high;
 399     DWORD dwPtrLow;
 400
 401     low = offset;
 402     high = offset >> 32;
 403
 404     /*
 405      * An error has occurred if the return value is INVALID_SET_FILE_POINTER
 406      * and GetLastError doesn't return NO_ERROR.
 407      */
 408     dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
 409     if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 410         fprintf(stderr, "SetFilePointer error: %lu\n", GetLastError());
 411         return -EIO;
 412     }
 413     if (SetEndOfFile(s->hfile) == 0) {
 414         fprintf(stderr, "SetEndOfFile error: %lu\n", GetLastError());
 415         return -EIO;
 416     }
 417     return 0;
 418 }
 419
 420 static int64_t raw_getlength(BlockDriverState *bs)
 421 {
 422     BDRVRawState *s = bs->opaque;
 423     LARGE_INTEGER l;
 424     ULARGE_INTEGER available, total, total_free;
 425     DISK_GEOMETRY_EX dg;
 426     DWORD count;
 427     BOOL status;
 428
 429     switch(s->type) {
 430     case FTYPE_FILE:
 431         l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
 432         if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 433             return -EIO;
 434         break;
 435     case FTYPE_CD:
 436         if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 437             return -EIO;
 438         l.QuadPart = total.QuadPart;
 439         break;
 440     case FTYPE_HARDDISK:
 441         status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 442                                  NULL, 0, &dg, sizeof(dg), &count, NULL);
 443         if (status != 0) {
 444             l = dg.DiskSize;
 445         }
 446         break;
 447     default:
 448         return -EIO;
 449     }
 450     return l.QuadPart;
 451 }
 452
 453 static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
 454 {
 455     typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
 456                                               DWORD * high);
 457     get_compressed_t get_compressed;
 458     struct _stati64 st;
 459     const char *filename = bs->filename;
 460     /* WinNT support GetCompressedFileSize to determine allocate size */
 461     get_compressed =
 462         (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
 463                                             "GetCompressedFileSizeA");
 464     if (get_compressed) {
 465         DWORD high, low;
 466         low = get_compressed(filename, &high);
 467         if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
 468             return (((int64_t) high) << 32) + low;
 469         }
 470     }
 471
 472     if (_stati64(filename, &st) < 0) {
 473         return -1;
 474     }
 475     return st.st_size;
 476 }
 477
 478 static int raw_create(const char *filename, QEMUOptionParameter *options,
 479                       Error **errp)
 480 {
 481     int fd;
 482     int64_t total_size = 0;
 483
 484     strstart(filename, "file:", &filename);
 485
 486     /* Read out options */
 487     while (options && options->name) {
 488         if (!strcmp(options->name, BLOCK_OPT_SIZE)) {
 489             total_size = options->value.n / 512;
 490         }
 491         options++;
 492     }
 493
 494     fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 495                    0644);
 496     if (fd < 0) {
 497         error_setg_errno(errp, errno, "Could not create file");
 498         return -EIO;
 499     }
 500     set_sparse(fd);
 501     ftruncate(fd, total_size * 512);
 502     qemu_close(fd);
 503     return 0;
 504 }
 505
 506 static QEMUOptionParameter raw_create_options[] = {
 507     {
 508         .name = BLOCK_OPT_SIZE,
 509         .type = OPT_SIZE,
 510         .help = "Virtual disk size"
 511     },
 512     { NULL }
 513 };
 514
 515 static BlockDriver bdrv_file = {
 516     .format_name        = "file",
 517     .protocol_name      = "file",
 518     .instance_size      = sizeof(BDRVRawState),
 519     .bdrv_needs_filename = true,
 520     .bdrv_parse_filename = raw_parse_filename,
 521     .bdrv_file_open     = raw_open,
 522     .bdrv_close         = raw_close,
 523     .bdrv_create        = raw_create,
 524     .bdrv_has_zero_init = bdrv_has_zero_init_1,
 525
 526     .bdrv_aio_readv     = raw_aio_readv,
 527     .bdrv_aio_writev    = raw_aio_writev,
 528     .bdrv_aio_flush     = raw_aio_flush,
 529
 530     .bdrv_truncate      = raw_truncate,
 531     .bdrv_getlength     = raw_getlength,
 532     .bdrv_get_allocated_file_size
 533                         = raw_get_allocated_file_size,
 534
 535     .create_options = raw_create_options,
 536 };
 537
 538 /***********************************************/
 539 /* host device */
 540
 541 static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 542 {
 543     char drives[256], *pdrv = drives;
 544     UINT type;
 545
 546     memset(drives, 0, sizeof(drives));
 547     GetLogicalDriveStrings(sizeof(drives), drives);
 548     while(pdrv[0] != '\0') {
 549         type = GetDriveType(pdrv);
 550         switch(type) {
 551         case DRIVE_CDROM:
 552             snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 553             return 0;
 554             break;
 555         }
 556         pdrv += lstrlen(pdrv) + 1;
 557     }
 558     return -1;
 559 }
 560
 561 static int find_device_type(BlockDriverState *bs, const char *filename)
 562 {
 563     BDRVRawState *s = bs->opaque;
 564     UINT type;
 565     const char *p;
 566
 567     if (strstart(filename, "\\\\.\\", &p) ||
 568         strstart(filename, "//./", &p)) {
 569         if (stristart(p, "PhysicalDrive", NULL))
 570             return FTYPE_HARDDISK;
 571         snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 572         type = GetDriveType(s->drive_path);
 573         switch (type) {
 574         case DRIVE_REMOVABLE:
 575         case DRIVE_FIXED:
 576             return FTYPE_HARDDISK;
 577         case DRIVE_CDROM:
 578             return FTYPE_CD;
 579         default:
 580             return FTYPE_FILE;
 581         }
 582     } else {
 583         return FTYPE_FILE;
 584     }
 585 }
 586
 587 static int hdev_probe_device(const char *filename)
 588 {
 589     if (strstart(filename, "/dev/cdrom", NULL))
 590         return 100;
 591     if (is_windows_drive(filename))
 592         return 100;
 593     return 0;
 594 }
 595
 596 static void hdev_parse_filename(const char *filename, QDict *options,
 597                                 Error **errp)
 598 {
 599     /* The prefix is optional, just as for "file". */
 600     strstart(filename, "host_device:", &filename);
 601
 602     qdict_put_obj(options, "filename", QOBJECT(qstring_from_str(filename)));
 603 }
 604
 605 static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
 606                      Error **errp)
 607 {
 608     BDRVRawState *s = bs->opaque;
 609     int access_flags, create_flags;
 610     int ret = 0;
 611     DWORD overlapped;
 612     char device_name[64];
 613
 614     Error *local_err = NULL;
 615     const char *filename;
 616
 617     QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
 618                                       &error_abort);
 619     qemu_opts_absorb_qdict(opts, options, &local_err);
 620     if (local_err) {
 621         error_propagate(errp, local_err);
 622         ret = -EINVAL;
 623         goto done;
 624     }
 625
 626     filename = qemu_opt_get(opts, "filename");
 627
 628     if (strstart(filename, "/dev/cdrom", NULL)) {
 629         if (find_cdrom(device_name, sizeof(device_name)) < 0) {
 630             error_setg(errp, "Could not open CD-ROM drive");
 631             ret = -ENOENT;
 632             goto done;
 633         }
 634         filename = device_name;
 635     } else {
 636         /* transform drive letters into device name */
 637         if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 638              (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 639             filename[1] == ':' && filename[2] == '\0') {
 640             snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 641             filename = device_name;
 642         }
 643     }
 644     s->type = find_device_type(bs, filename);
 645
 646     raw_parse_flags(flags, &access_flags, &overlapped);
 647
 648     create_flags = OPEN_EXISTING;
 649
 650     s->hfile = CreateFile(filename, access_flags,
 651                           FILE_SHARE_READ, NULL,
 652                           create_flags, overlapped, NULL);
 653     if (s->hfile == INVALID_HANDLE_VALUE) {
 654         int err = GetLastError();
 655
 656         if (err == ERROR_ACCESS_DENIED) {
 657             ret = -EACCES;
 658         } else {
 659             ret = -EINVAL;
 660         }
 661         error_setg_errno(errp, -ret, "Could not open device");
 662         goto done;
 663     }
 664
 665 done:
 666     qemu_opts_del(opts);
 667     return ret;
 668 }
 669
 670 static BlockDriver bdrv_host_device = {
 671     .format_name        = "host_device",
 672     .protocol_name      = "host_device",
 673     .instance_size      = sizeof(BDRVRawState),
 674     .bdrv_needs_filename = true,
 675     .bdrv_parse_filename = hdev_parse_filename,
 676     .bdrv_probe_device  = hdev_probe_device,
 677     .bdrv_file_open     = hdev_open,
 678     .bdrv_close         = raw_close,
 679
 680     .bdrv_aio_readv     = raw_aio_readv,
 681     .bdrv_aio_writev    = raw_aio_writev,
 682     .bdrv_aio_flush     = raw_aio_flush,
 683
 684     .bdrv_getlength      = raw_getlength,
 685     .has_variable_length = true,
 686
 687     .bdrv_get_allocated_file_size
 688                         = raw_get_allocated_file_size,
 689 };
 690
 691 static void bdrv_file_init(void)
 692 {
 693     bdrv_register(&bdrv_file);
 694     bdrv_register(&bdrv_host_device);
 695 }
 696
 697 block_init(bdrv_file_init);