qemu/block/file-win32.c
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   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/osdep.h"
  25#include "qapi/error.h"
  26#include "qemu/cutils.h"
  27#include "block/block_int.h"
  28#include "qemu/module.h"
  29#include "block/raw-aio.h"
  30#include "trace.h"
  31#include "block/thread-pool.h"
  32#include "qemu/iov.h"
  33#include "qapi/qmp/qstring.h"
  34#include <windows.h>
  35#include <winioctl.h>
  36
  37#define FTYPE_FILE 0
  38#define FTYPE_CD     1
  39#define FTYPE_HARDDISK 2
  40
  41typedef 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
  51typedef 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 */
  64static 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
  97static 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) {
 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            ret = 0;
 124        } else {
 125            ret = -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_free(aiocb);
 140    return ret;
 141}
 142
 143static BlockAIOCB *paio_submit(BlockDriverState *bs, HANDLE hfile,
 144        int64_t offset, QEMUIOVector *qiov, int count,
 145        BlockCompletionFunc *cb, void *opaque, int type)
 146{
 147    RawWin32AIOData *acb = g_new(RawWin32AIOData, 1);
 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        assert(qiov->size == count);
 158    }
 159    acb->aio_nbytes = count;
 160    acb->aio_offset = offset;
 161
 162    trace_paio_submit(acb, opaque, offset, count, type);
 163    pool = aio_get_thread_pool(bdrv_get_aio_context(bs));
 164    return thread_pool_submit_aio(pool, aio_worker, acb, cb, opaque);
 165}
 166
 167int qemu_ftruncate64(int fd, int64_t length)
 168{
 169    LARGE_INTEGER li;
 170    DWORD dw;
 171    LONG high;
 172    HANDLE h;
 173    BOOL res;
 174
 175    if ((GetVersion() & 0x80000000UL) && (length >> 32) != 0)
 176        return -1;
 177
 178    h = (HANDLE)_get_osfhandle(fd);
 179
 180    /* get current position, ftruncate do not change position */
 181    li.HighPart = 0;
 182    li.LowPart = SetFilePointer (h, 0, &li.HighPart, FILE_CURRENT);
 183    if (li.LowPart == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 184        return -1;
 185    }
 186
 187    high = length >> 32;
 188    dw = SetFilePointer(h, (DWORD) length, &high, FILE_BEGIN);
 189    if (dw == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 190        return -1;
 191    }
 192    res = SetEndOfFile(h);
 193
 194    /* back to old position */
 195    SetFilePointer(h, li.LowPart, &li.HighPart, FILE_BEGIN);
 196    return res ? 0 : -1;
 197}
 198
 199static int set_sparse(int fd)
 200{
 201    DWORD returned;
 202    return (int) DeviceIoControl((HANDLE)_get_osfhandle(fd), FSCTL_SET_SPARSE,
 203                                 NULL, 0, NULL, 0, &returned, NULL);
 204}
 205
 206static void raw_detach_aio_context(BlockDriverState *bs)
 207{
 208    BDRVRawState *s = bs->opaque;
 209
 210    if (s->aio) {
 211        win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
 212    }
 213}
 214
 215static void raw_attach_aio_context(BlockDriverState *bs,
 216                                   AioContext *new_context)
 217{
 218    BDRVRawState *s = bs->opaque;
 219
 220    if (s->aio) {
 221        win32_aio_attach_aio_context(s->aio, new_context);
 222    }
 223}
 224
 225static void raw_probe_alignment(BlockDriverState *bs, Error **errp)
 226{
 227    BDRVRawState *s = bs->opaque;
 228    DWORD sectorsPerCluster, freeClusters, totalClusters, count;
 229    DISK_GEOMETRY_EX dg;
 230    BOOL status;
 231
 232    if (s->type == FTYPE_CD) {
 233        bs->bl.request_alignment = 2048;
 234        return;
 235    }
 236    if (s->type == FTYPE_HARDDISK) {
 237        status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 238                                 NULL, 0, &dg, sizeof(dg), &count, NULL);
 239        if (status != 0) {
 240            bs->bl.request_alignment = dg.Geometry.BytesPerSector;
 241            return;
 242        }
 243        /* try GetDiskFreeSpace too */
 244    }
 245
 246    if (s->drive_path[0]) {
 247        GetDiskFreeSpace(s->drive_path, &sectorsPerCluster,
 248                         &dg.Geometry.BytesPerSector,
 249                         &freeClusters, &totalClusters);
 250        bs->bl.request_alignment = dg.Geometry.BytesPerSector;
 251    }
 252}
 253
 254static void raw_parse_flags(int flags, bool use_aio, int *access_flags,
 255                            DWORD *overlapped)
 256{
 257    assert(access_flags != NULL);
 258    assert(overlapped != NULL);
 259
 260    if (flags & BDRV_O_RDWR) {
 261        *access_flags = GENERIC_READ | GENERIC_WRITE;
 262    } else {
 263        *access_flags = GENERIC_READ;
 264    }
 265
 266    *overlapped = FILE_ATTRIBUTE_NORMAL;
 267    if (use_aio) {
 268        *overlapped |= FILE_FLAG_OVERLAPPED;
 269    }
 270    if (flags & BDRV_O_NOCACHE) {
 271        *overlapped |= FILE_FLAG_NO_BUFFERING;
 272    }
 273}
 274
 275static void raw_parse_filename(const char *filename, QDict *options,
 276                               Error **errp)
 277{
 278    bdrv_parse_filename_strip_prefix(filename, "file:", options);
 279}
 280
 281static QemuOptsList raw_runtime_opts = {
 282    .name = "raw",
 283    .head = QTAILQ_HEAD_INITIALIZER(raw_runtime_opts.head),
 284    .desc = {
 285        {
 286            .name = "filename",
 287            .type = QEMU_OPT_STRING,
 288            .help = "File name of the image",
 289        },
 290        {
 291            .name = "aio",
 292            .type = QEMU_OPT_STRING,
 293            .help = "host AIO implementation (threads, native)",
 294        },
 295        { /* end of list */ }
 296    },
 297};
 298
 299static bool get_aio_option(QemuOpts *opts, int flags, Error **errp)
 300{
 301    BlockdevAioOptions aio, aio_default;
 302
 303    aio_default = (flags & BDRV_O_NATIVE_AIO) ? BLOCKDEV_AIO_OPTIONS_NATIVE
 304                                              : BLOCKDEV_AIO_OPTIONS_THREADS;
 305    aio = qapi_enum_parse(&BlockdevAioOptions_lookup, qemu_opt_get(opts, "aio"),
 306                          aio_default, errp);
 307
 308    switch (aio) {
 309    case BLOCKDEV_AIO_OPTIONS_NATIVE:
 310        return true;
 311    case BLOCKDEV_AIO_OPTIONS_THREADS:
 312        return false;
 313    default:
 314        error_setg(errp, "Invalid AIO option");
 315    }
 316    return false;
 317}
 318
 319static int raw_open(BlockDriverState *bs, QDict *options, int flags,
 320                    Error **errp)
 321{
 322    BDRVRawState *s = bs->opaque;
 323    int access_flags;
 324    DWORD overlapped;
 325    QemuOpts *opts;
 326    Error *local_err = NULL;
 327    const char *filename;
 328    bool use_aio;
 329    int ret;
 330
 331    s->type = FTYPE_FILE;
 332
 333    opts = qemu_opts_create(&raw_runtime_opts, NULL, 0, &error_abort);
 334    qemu_opts_absorb_qdict(opts, options, &local_err);
 335    if (local_err) {
 336        error_propagate(errp, local_err);
 337        ret = -EINVAL;
 338        goto fail;
 339    }
 340
 341    if (qdict_get_try_bool(options, "locking", false)) {
 342        error_setg(errp, "locking=on is not supported on Windows");
 343        ret = -EINVAL;
 344        goto fail;
 345    }
 346
 347    filename = qemu_opt_get(opts, "filename");
 348
 349    use_aio = get_aio_option(opts, flags, &local_err);
 350    if (local_err) {
 351        error_propagate(errp, local_err);
 352        ret = -EINVAL;
 353        goto fail;
 354    }
 355
 356    raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
 357
 358    if (filename[0] && filename[1] == ':') {
 359        snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", filename[0]);
 360    } else if (filename[0] == '\\' && filename[1] == '\\') {
 361        s->drive_path[0] = 0;
 362    } else {
 363        /* Relative path.  */
 364        char buf[MAX_PATH];
 365        GetCurrentDirectory(MAX_PATH, buf);
 366        snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", buf[0]);
 367    }
 368
 369    s->hfile = CreateFile(filename, access_flags,
 370                          FILE_SHARE_READ, NULL,
 371                          OPEN_EXISTING, overlapped, NULL);
 372    if (s->hfile == INVALID_HANDLE_VALUE) {
 373        int err = GetLastError();
 374
 375        error_setg_win32(errp, err, "Could not open '%s'", filename);
 376        if (err == ERROR_ACCESS_DENIED) {
 377            ret = -EACCES;
 378        } else {
 379            ret = -EINVAL;
 380        }
 381        goto fail;
 382    }
 383
 384    if (use_aio) {
 385        s->aio = win32_aio_init();
 386        if (s->aio == NULL) {
 387            CloseHandle(s->hfile);
 388            error_setg(errp, "Could not initialize AIO");
 389            ret = -EINVAL;
 390            goto fail;
 391        }
 392
 393        ret = win32_aio_attach(s->aio, s->hfile);
 394        if (ret < 0) {
 395            win32_aio_cleanup(s->aio);
 396            CloseHandle(s->hfile);
 397            error_setg_errno(errp, -ret, "Could not enable AIO");
 398            goto fail;
 399        }
 400
 401        win32_aio_attach_aio_context(s->aio, bdrv_get_aio_context(bs));
 402    }
 403
 404    ret = 0;
 405fail:
 406    qemu_opts_del(opts);
 407    return ret;
 408}
 409
 410static BlockAIOCB *raw_aio_readv(BlockDriverState *bs,
 411                         int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 412                         BlockCompletionFunc *cb, void *opaque)
 413{
 414    BDRVRawState *s = bs->opaque;
 415    if (s->aio) {
 416        return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
 417                                nb_sectors, cb, opaque, QEMU_AIO_READ);
 418    } else {
 419        return paio_submit(bs, s->hfile, sector_num << BDRV_SECTOR_BITS, qiov,
 420                           nb_sectors << BDRV_SECTOR_BITS,
 421                           cb, opaque, QEMU_AIO_READ);
 422    }
 423}
 424
 425static BlockAIOCB *raw_aio_writev(BlockDriverState *bs,
 426                          int64_t sector_num, QEMUIOVector *qiov, int nb_sectors,
 427                          BlockCompletionFunc *cb, void *opaque)
 428{
 429    BDRVRawState *s = bs->opaque;
 430    if (s->aio) {
 431        return win32_aio_submit(bs, s->aio, s->hfile, sector_num, qiov,
 432                                nb_sectors, cb, opaque, QEMU_AIO_WRITE);
 433    } else {
 434        return paio_submit(bs, s->hfile, sector_num << BDRV_SECTOR_BITS, qiov,
 435                           nb_sectors << BDRV_SECTOR_BITS,
 436                           cb, opaque, QEMU_AIO_WRITE);
 437    }
 438}
 439
 440static BlockAIOCB *raw_aio_flush(BlockDriverState *bs,
 441                         BlockCompletionFunc *cb, void *opaque)
 442{
 443    BDRVRawState *s = bs->opaque;
 444    return paio_submit(bs, s->hfile, 0, NULL, 0, cb, opaque, QEMU_AIO_FLUSH);
 445}
 446
 447static void raw_close(BlockDriverState *bs)
 448{
 449    BDRVRawState *s = bs->opaque;
 450
 451    if (s->aio) {
 452        win32_aio_detach_aio_context(s->aio, bdrv_get_aio_context(bs));
 453        win32_aio_cleanup(s->aio);
 454        s->aio = NULL;
 455    }
 456
 457    CloseHandle(s->hfile);
 458    if (bs->open_flags & BDRV_O_TEMPORARY) {
 459        unlink(bs->filename);
 460    }
 461}
 462
 463static int raw_truncate(BlockDriverState *bs, int64_t offset,
 464                        PreallocMode prealloc, Error **errp)
 465{
 466    BDRVRawState *s = bs->opaque;
 467    LONG low, high;
 468    DWORD dwPtrLow;
 469
 470    if (prealloc != PREALLOC_MODE_OFF) {
 471        error_setg(errp, "Unsupported preallocation mode '%s'",
 472                   PreallocMode_str(prealloc));
 473        return -ENOTSUP;
 474    }
 475
 476    low = offset;
 477    high = offset >> 32;
 478
 479    /*
 480     * An error has occurred if the return value is INVALID_SET_FILE_POINTER
 481     * and GetLastError doesn't return NO_ERROR.
 482     */
 483    dwPtrLow = SetFilePointer(s->hfile, low, &high, FILE_BEGIN);
 484    if (dwPtrLow == INVALID_SET_FILE_POINTER && GetLastError() != NO_ERROR) {
 485        error_setg_win32(errp, GetLastError(), "SetFilePointer error");
 486        return -EIO;
 487    }
 488    if (SetEndOfFile(s->hfile) == 0) {
 489        error_setg_win32(errp, GetLastError(), "SetEndOfFile error");
 490        return -EIO;
 491    }
 492    return 0;
 493}
 494
 495static int64_t raw_getlength(BlockDriverState *bs)
 496{
 497    BDRVRawState *s = bs->opaque;
 498    LARGE_INTEGER l;
 499    ULARGE_INTEGER available, total, total_free;
 500    DISK_GEOMETRY_EX dg;
 501    DWORD count;
 502    BOOL status;
 503
 504    switch(s->type) {
 505    case FTYPE_FILE:
 506        l.LowPart = GetFileSize(s->hfile, (PDWORD)&l.HighPart);
 507        if (l.LowPart == 0xffffffffUL && GetLastError() != NO_ERROR)
 508            return -EIO;
 509        break;
 510    case FTYPE_CD:
 511        if (!GetDiskFreeSpaceEx(s->drive_path, &available, &total, &total_free))
 512            return -EIO;
 513        l.QuadPart = total.QuadPart;
 514        break;
 515    case FTYPE_HARDDISK:
 516        status = DeviceIoControl(s->hfile, IOCTL_DISK_GET_DRIVE_GEOMETRY_EX,
 517                                 NULL, 0, &dg, sizeof(dg), &count, NULL);
 518        if (status != 0) {
 519            l = dg.DiskSize;
 520        }
 521        break;
 522    default:
 523        return -EIO;
 524    }
 525    return l.QuadPart;
 526}
 527
 528static int64_t raw_get_allocated_file_size(BlockDriverState *bs)
 529{
 530    typedef DWORD (WINAPI * get_compressed_t)(const char *filename,
 531                                              DWORD * high);
 532    get_compressed_t get_compressed;
 533    struct _stati64 st;
 534    const char *filename = bs->filename;
 535    /* WinNT support GetCompressedFileSize to determine allocate size */
 536    get_compressed =
 537        (get_compressed_t) GetProcAddress(GetModuleHandle("kernel32"),
 538                                            "GetCompressedFileSizeA");
 539    if (get_compressed) {
 540        DWORD high, low;
 541        low = get_compressed(filename, &high);
 542        if (low != 0xFFFFFFFFlu || GetLastError() == NO_ERROR) {
 543            return (((int64_t) high) << 32) + low;
 544        }
 545    }
 546
 547    if (_stati64(filename, &st) < 0) {
 548        return -1;
 549    }
 550    return st.st_size;
 551}
 552
 553static int raw_create(const char *filename, QemuOpts *opts, Error **errp)
 554{
 555    int fd;
 556    int64_t total_size = 0;
 557
 558    strstart(filename, "file:", &filename);
 559
 560    /* Read out options */
 561    total_size = ROUND_UP(qemu_opt_get_size_del(opts, BLOCK_OPT_SIZE, 0),
 562                          BDRV_SECTOR_SIZE);
 563
 564    fd = qemu_open(filename, O_WRONLY | O_CREAT | O_TRUNC | O_BINARY,
 565                   0644);
 566    if (fd < 0) {
 567        error_setg_errno(errp, errno, "Could not create file");
 568        return -EIO;
 569    }
 570    set_sparse(fd);
 571    ftruncate(fd, total_size);
 572    qemu_close(fd);
 573    return 0;
 574}
 575
 576
 577static QemuOptsList raw_create_opts = {
 578    .name = "raw-create-opts",
 579    .head = QTAILQ_HEAD_INITIALIZER(raw_create_opts.head),
 580    .desc = {
 581        {
 582            .name = BLOCK_OPT_SIZE,
 583            .type = QEMU_OPT_SIZE,
 584            .help = "Virtual disk size"
 585        },
 586        { /* end of list */ }
 587    }
 588};
 589
 590BlockDriver bdrv_file = {
 591    .format_name        = "file",
 592    .protocol_name      = "file",
 593    .instance_size      = sizeof(BDRVRawState),
 594    .bdrv_needs_filename = true,
 595    .bdrv_parse_filename = raw_parse_filename,
 596    .bdrv_file_open     = raw_open,
 597    .bdrv_refresh_limits = raw_probe_alignment,
 598    .bdrv_close         = raw_close,
 599    .bdrv_create        = raw_create,
 600    .bdrv_has_zero_init = bdrv_has_zero_init_1,
 601
 602    .bdrv_aio_readv     = raw_aio_readv,
 603    .bdrv_aio_writev    = raw_aio_writev,
 604    .bdrv_aio_flush     = raw_aio_flush,
 605
 606    .bdrv_truncate      = raw_truncate,
 607    .bdrv_getlength     = raw_getlength,
 608    .bdrv_get_allocated_file_size
 609                        = raw_get_allocated_file_size,
 610
 611    .create_opts        = &raw_create_opts,
 612};
 613
 614/***********************************************/
 615/* host device */
 616
 617static int find_cdrom(char *cdrom_name, int cdrom_name_size)
 618{
 619    char drives[256], *pdrv = drives;
 620    UINT type;
 621
 622    memset(drives, 0, sizeof(drives));
 623    GetLogicalDriveStrings(sizeof(drives), drives);
 624    while(pdrv[0] != '\0') {
 625        type = GetDriveType(pdrv);
 626        switch(type) {
 627        case DRIVE_CDROM:
 628            snprintf(cdrom_name, cdrom_name_size, "\\\\.\\%c:", pdrv[0]);
 629            return 0;
 630            break;
 631        }
 632        pdrv += lstrlen(pdrv) + 1;
 633    }
 634    return -1;
 635}
 636
 637static int find_device_type(BlockDriverState *bs, const char *filename)
 638{
 639    BDRVRawState *s = bs->opaque;
 640    UINT type;
 641    const char *p;
 642
 643    if (strstart(filename, "\\\\.\\", &p) ||
 644        strstart(filename, "//./", &p)) {
 645        if (stristart(p, "PhysicalDrive", NULL))
 646            return FTYPE_HARDDISK;
 647        snprintf(s->drive_path, sizeof(s->drive_path), "%c:\\", p[0]);
 648        type = GetDriveType(s->drive_path);
 649        switch (type) {
 650        case DRIVE_REMOVABLE:
 651        case DRIVE_FIXED:
 652            return FTYPE_HARDDISK;
 653        case DRIVE_CDROM:
 654            return FTYPE_CD;
 655        default:
 656            return FTYPE_FILE;
 657        }
 658    } else {
 659        return FTYPE_FILE;
 660    }
 661}
 662
 663static int hdev_probe_device(const char *filename)
 664{
 665    if (strstart(filename, "/dev/cdrom", NULL))
 666        return 100;
 667    if (is_windows_drive(filename))
 668        return 100;
 669    return 0;
 670}
 671
 672static void hdev_parse_filename(const char *filename, QDict *options,
 673                                Error **errp)
 674{
 675    bdrv_parse_filename_strip_prefix(filename, "host_device:", options);
 676}
 677
 678static int hdev_open(BlockDriverState *bs, QDict *options, int flags,
 679                     Error **errp)
 680{
 681    BDRVRawState *s = bs->opaque;
 682    int access_flags, create_flags;
 683    int ret = 0;
 684    DWORD overlapped;
 685    char device_name[64];
 686
 687    Error *local_err = NULL;
 688    const char *filename;
 689    bool use_aio;
 690
 691    QemuOpts *opts = qemu_opts_create(&raw_runtime_opts, NULL, 0,
 692                                      &error_abort);
 693    qemu_opts_absorb_qdict(opts, options, &local_err);
 694    if (local_err) {
 695        error_propagate(errp, local_err);
 696        ret = -EINVAL;
 697        goto done;
 698    }
 699
 700    filename = qemu_opt_get(opts, "filename");
 701
 702    use_aio = get_aio_option(opts, flags, &local_err);
 703    if (!local_err && use_aio) {
 704        error_setg(&local_err, "AIO is not supported on Windows host devices");
 705    }
 706    if (local_err) {
 707        error_propagate(errp, local_err);
 708        ret = -EINVAL;
 709        goto done;
 710    }
 711
 712    if (strstart(filename, "/dev/cdrom", NULL)) {
 713        if (find_cdrom(device_name, sizeof(device_name)) < 0) {
 714            error_setg(errp, "Could not open CD-ROM drive");
 715            ret = -ENOENT;
 716            goto done;
 717        }
 718        filename = device_name;
 719    } else {
 720        /* transform drive letters into device name */
 721        if (((filename[0] >= 'a' && filename[0] <= 'z') ||
 722             (filename[0] >= 'A' && filename[0] <= 'Z')) &&
 723            filename[1] == ':' && filename[2] == '\0') {
 724            snprintf(device_name, sizeof(device_name), "\\\\.\\%c:", filename[0]);
 725            filename = device_name;
 726        }
 727    }
 728    s->type = find_device_type(bs, filename);
 729
 730    raw_parse_flags(flags, use_aio, &access_flags, &overlapped);
 731
 732    create_flags = OPEN_EXISTING;
 733
 734    s->hfile = CreateFile(filename, access_flags,
 735                          FILE_SHARE_READ, NULL,
 736                          create_flags, overlapped, NULL);
 737    if (s->hfile == INVALID_HANDLE_VALUE) {
 738        int err = GetLastError();
 739
 740        if (err == ERROR_ACCESS_DENIED) {
 741            ret = -EACCES;
 742        } else {
 743            ret = -EINVAL;
 744        }
 745        error_setg_errno(errp, -ret, "Could not open device");
 746        goto done;
 747    }
 748
 749done:
 750    qemu_opts_del(opts);
 751    return ret;
 752}
 753
 754static BlockDriver bdrv_host_device = {
 755    .format_name        = "host_device",
 756    .protocol_name      = "host_device",
 757    .instance_size      = sizeof(BDRVRawState),
 758    .bdrv_needs_filename = true,
 759    .bdrv_parse_filename = hdev_parse_filename,
 760    .bdrv_probe_device  = hdev_probe_device,
 761    .bdrv_file_open     = hdev_open,
 762    .bdrv_close         = raw_close,
 763
 764    .bdrv_aio_readv     = raw_aio_readv,
 765    .bdrv_aio_writev    = raw_aio_writev,
 766    .bdrv_aio_flush     = raw_aio_flush,
 767
 768    .bdrv_detach_aio_context = raw_detach_aio_context,
 769    .bdrv_attach_aio_context = raw_attach_aio_context,
 770
 771    .bdrv_getlength      = raw_getlength,
 772    .has_variable_length = true,
 773
 774    .bdrv_get_allocated_file_size
 775                        = raw_get_allocated_file_size,
 776};
 777
 778static void bdrv_file_init(void)
 779{
 780    bdrv_register(&bdrv_file);
 781    bdrv_register(&bdrv_host_device);
 782}
 783
 784block_init(bdrv_file_init);
 785